Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
39279cc3 CM |
29 | #include <linux/backing-dev.h> |
30 | #include <linux/mpage.h> | |
31 | #include <linux/swap.h> | |
32 | #include <linux/writeback.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/compat.h> | |
9ebefb18 | 35 | #include <linux/bit_spinlock.h> |
5103e947 | 36 | #include <linux/xattr.h> |
33268eaf | 37 | #include <linux/posix_acl.h> |
d899e052 | 38 | #include <linux/falloc.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
7a36ddec | 40 | #include <linux/ratelimit.h> |
22c44fe6 | 41 | #include <linux/mount.h> |
55e301fd | 42 | #include <linux/btrfs.h> |
53b381b3 | 43 | #include <linux/blkdev.h> |
f23b5a59 | 44 | #include <linux/posix_acl_xattr.h> |
e2e40f2c | 45 | #include <linux/uio.h> |
39279cc3 CM |
46 | #include "ctree.h" |
47 | #include "disk-io.h" | |
48 | #include "transaction.h" | |
49 | #include "btrfs_inode.h" | |
39279cc3 | 50 | #include "print-tree.h" |
e6dcd2dc | 51 | #include "ordered-data.h" |
95819c05 | 52 | #include "xattr.h" |
e02119d5 | 53 | #include "tree-log.h" |
4a54c8c1 | 54 | #include "volumes.h" |
c8b97818 | 55 | #include "compression.h" |
b4ce94de | 56 | #include "locking.h" |
dc89e982 | 57 | #include "free-space-cache.h" |
581bb050 | 58 | #include "inode-map.h" |
38c227d8 | 59 | #include "backref.h" |
f23b5a59 | 60 | #include "hash.h" |
63541927 | 61 | #include "props.h" |
31193213 | 62 | #include "qgroup.h" |
39279cc3 CM |
63 | |
64 | struct btrfs_iget_args { | |
90d3e592 | 65 | struct btrfs_key *location; |
39279cc3 CM |
66 | struct btrfs_root *root; |
67 | }; | |
68 | ||
6e1d5dcc AD |
69 | static const struct inode_operations btrfs_dir_inode_operations; |
70 | static const struct inode_operations btrfs_symlink_inode_operations; | |
71 | static const struct inode_operations btrfs_dir_ro_inode_operations; | |
72 | static const struct inode_operations btrfs_special_inode_operations; | |
73 | static const struct inode_operations btrfs_file_inode_operations; | |
7f09410b AD |
74 | static const struct address_space_operations btrfs_aops; |
75 | static const struct address_space_operations btrfs_symlink_aops; | |
828c0950 | 76 | static const struct file_operations btrfs_dir_file_operations; |
d1310b2e | 77 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
78 | |
79 | static struct kmem_cache *btrfs_inode_cachep; | |
8ccf6f19 | 80 | static struct kmem_cache *btrfs_delalloc_work_cachep; |
39279cc3 CM |
81 | struct kmem_cache *btrfs_trans_handle_cachep; |
82 | struct kmem_cache *btrfs_transaction_cachep; | |
39279cc3 | 83 | struct kmem_cache *btrfs_path_cachep; |
dc89e982 | 84 | struct kmem_cache *btrfs_free_space_cachep; |
39279cc3 CM |
85 | |
86 | #define S_SHIFT 12 | |
87 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
88 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
89 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
90 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
91 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
92 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
93 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
94 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
95 | }; | |
96 | ||
3972f260 | 97 | static int btrfs_setsize(struct inode *inode, struct iattr *attr); |
a41ad394 | 98 | static int btrfs_truncate(struct inode *inode); |
5fd02043 | 99 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); |
771ed689 CM |
100 | static noinline int cow_file_range(struct inode *inode, |
101 | struct page *locked_page, | |
102 | u64 start, u64 end, int *page_started, | |
103 | unsigned long *nr_written, int unlock); | |
70c8a91c JB |
104 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
105 | u64 len, u64 orig_start, | |
106 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
107 | u64 orig_block_len, u64 ram_bytes, |
108 | int type); | |
7b128766 | 109 | |
48a3b636 | 110 | static int btrfs_dirty_inode(struct inode *inode); |
7b128766 | 111 | |
6a3891c5 JB |
112 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
113 | void btrfs_test_inode_set_ops(struct inode *inode) | |
114 | { | |
115 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; | |
116 | } | |
117 | #endif | |
118 | ||
f34f57a3 | 119 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
2a7dba39 EP |
120 | struct inode *inode, struct inode *dir, |
121 | const struct qstr *qstr) | |
0279b4cd JO |
122 | { |
123 | int err; | |
124 | ||
f34f57a3 | 125 | err = btrfs_init_acl(trans, inode, dir); |
0279b4cd | 126 | if (!err) |
2a7dba39 | 127 | err = btrfs_xattr_security_init(trans, inode, dir, qstr); |
0279b4cd JO |
128 | return err; |
129 | } | |
130 | ||
c8b97818 CM |
131 | /* |
132 | * this does all the hard work for inserting an inline extent into | |
133 | * the btree. The caller should have done a btrfs_drop_extents so that | |
134 | * no overlapping inline items exist in the btree | |
135 | */ | |
40f76580 | 136 | static int insert_inline_extent(struct btrfs_trans_handle *trans, |
1acae57b | 137 | struct btrfs_path *path, int extent_inserted, |
c8b97818 CM |
138 | struct btrfs_root *root, struct inode *inode, |
139 | u64 start, size_t size, size_t compressed_size, | |
fe3f566c | 140 | int compress_type, |
c8b97818 CM |
141 | struct page **compressed_pages) |
142 | { | |
c8b97818 CM |
143 | struct extent_buffer *leaf; |
144 | struct page *page = NULL; | |
145 | char *kaddr; | |
146 | unsigned long ptr; | |
147 | struct btrfs_file_extent_item *ei; | |
148 | int err = 0; | |
149 | int ret; | |
150 | size_t cur_size = size; | |
c8b97818 | 151 | unsigned long offset; |
c8b97818 | 152 | |
fe3f566c | 153 | if (compressed_size && compressed_pages) |
c8b97818 | 154 | cur_size = compressed_size; |
c8b97818 | 155 | |
1acae57b | 156 | inode_add_bytes(inode, size); |
c8b97818 | 157 | |
1acae57b FDBM |
158 | if (!extent_inserted) { |
159 | struct btrfs_key key; | |
160 | size_t datasize; | |
c8b97818 | 161 | |
1acae57b FDBM |
162 | key.objectid = btrfs_ino(inode); |
163 | key.offset = start; | |
962a298f | 164 | key.type = BTRFS_EXTENT_DATA_KEY; |
c8b97818 | 165 | |
1acae57b FDBM |
166 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
167 | path->leave_spinning = 1; | |
168 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
169 | datasize); | |
170 | if (ret) { | |
171 | err = ret; | |
172 | goto fail; | |
173 | } | |
c8b97818 CM |
174 | } |
175 | leaf = path->nodes[0]; | |
176 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
177 | struct btrfs_file_extent_item); | |
178 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
179 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
180 | btrfs_set_file_extent_encryption(leaf, ei, 0); | |
181 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
182 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); | |
183 | ptr = btrfs_file_extent_inline_start(ei); | |
184 | ||
261507a0 | 185 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 CM |
186 | struct page *cpage; |
187 | int i = 0; | |
d397712b | 188 | while (compressed_size > 0) { |
c8b97818 | 189 | cpage = compressed_pages[i]; |
5b050f04 | 190 | cur_size = min_t(unsigned long, compressed_size, |
c8b97818 CM |
191 | PAGE_CACHE_SIZE); |
192 | ||
7ac687d9 | 193 | kaddr = kmap_atomic(cpage); |
c8b97818 | 194 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
7ac687d9 | 195 | kunmap_atomic(kaddr); |
c8b97818 CM |
196 | |
197 | i++; | |
198 | ptr += cur_size; | |
199 | compressed_size -= cur_size; | |
200 | } | |
201 | btrfs_set_file_extent_compression(leaf, ei, | |
261507a0 | 202 | compress_type); |
c8b97818 CM |
203 | } else { |
204 | page = find_get_page(inode->i_mapping, | |
205 | start >> PAGE_CACHE_SHIFT); | |
206 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7ac687d9 | 207 | kaddr = kmap_atomic(page); |
c8b97818 CM |
208 | offset = start & (PAGE_CACHE_SIZE - 1); |
209 | write_extent_buffer(leaf, kaddr + offset, ptr, size); | |
7ac687d9 | 210 | kunmap_atomic(kaddr); |
c8b97818 CM |
211 | page_cache_release(page); |
212 | } | |
213 | btrfs_mark_buffer_dirty(leaf); | |
1acae57b | 214 | btrfs_release_path(path); |
c8b97818 | 215 | |
c2167754 YZ |
216 | /* |
217 | * we're an inline extent, so nobody can | |
218 | * extend the file past i_size without locking | |
219 | * a page we already have locked. | |
220 | * | |
221 | * We must do any isize and inode updates | |
222 | * before we unlock the pages. Otherwise we | |
223 | * could end up racing with unlink. | |
224 | */ | |
c8b97818 | 225 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
79787eaa | 226 | ret = btrfs_update_inode(trans, root, inode); |
c2167754 | 227 | |
79787eaa | 228 | return ret; |
c8b97818 | 229 | fail: |
c8b97818 CM |
230 | return err; |
231 | } | |
232 | ||
233 | ||
234 | /* | |
235 | * conditionally insert an inline extent into the file. This | |
236 | * does the checks required to make sure the data is small enough | |
237 | * to fit as an inline extent. | |
238 | */ | |
00361589 JB |
239 | static noinline int cow_file_range_inline(struct btrfs_root *root, |
240 | struct inode *inode, u64 start, | |
241 | u64 end, size_t compressed_size, | |
242 | int compress_type, | |
243 | struct page **compressed_pages) | |
c8b97818 | 244 | { |
00361589 | 245 | struct btrfs_trans_handle *trans; |
c8b97818 CM |
246 | u64 isize = i_size_read(inode); |
247 | u64 actual_end = min(end + 1, isize); | |
248 | u64 inline_len = actual_end - start; | |
fda2832f | 249 | u64 aligned_end = ALIGN(end, root->sectorsize); |
c8b97818 CM |
250 | u64 data_len = inline_len; |
251 | int ret; | |
1acae57b FDBM |
252 | struct btrfs_path *path; |
253 | int extent_inserted = 0; | |
254 | u32 extent_item_size; | |
c8b97818 CM |
255 | |
256 | if (compressed_size) | |
257 | data_len = compressed_size; | |
258 | ||
259 | if (start > 0 || | |
354877be WS |
260 | actual_end > PAGE_CACHE_SIZE || |
261 | data_len > BTRFS_MAX_INLINE_DATA_SIZE(root) || | |
c8b97818 CM |
262 | (!compressed_size && |
263 | (actual_end & (root->sectorsize - 1)) == 0) || | |
264 | end + 1 < isize || | |
265 | data_len > root->fs_info->max_inline) { | |
266 | return 1; | |
267 | } | |
268 | ||
1acae57b FDBM |
269 | path = btrfs_alloc_path(); |
270 | if (!path) | |
271 | return -ENOMEM; | |
272 | ||
00361589 | 273 | trans = btrfs_join_transaction(root); |
1acae57b FDBM |
274 | if (IS_ERR(trans)) { |
275 | btrfs_free_path(path); | |
00361589 | 276 | return PTR_ERR(trans); |
1acae57b | 277 | } |
00361589 JB |
278 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
279 | ||
1acae57b FDBM |
280 | if (compressed_size && compressed_pages) |
281 | extent_item_size = btrfs_file_extent_calc_inline_size( | |
282 | compressed_size); | |
283 | else | |
284 | extent_item_size = btrfs_file_extent_calc_inline_size( | |
285 | inline_len); | |
286 | ||
287 | ret = __btrfs_drop_extents(trans, root, inode, path, | |
288 | start, aligned_end, NULL, | |
289 | 1, 1, extent_item_size, &extent_inserted); | |
00361589 JB |
290 | if (ret) { |
291 | btrfs_abort_transaction(trans, root, ret); | |
292 | goto out; | |
293 | } | |
c8b97818 CM |
294 | |
295 | if (isize > actual_end) | |
296 | inline_len = min_t(u64, isize, actual_end); | |
1acae57b FDBM |
297 | ret = insert_inline_extent(trans, path, extent_inserted, |
298 | root, inode, start, | |
c8b97818 | 299 | inline_len, compressed_size, |
fe3f566c | 300 | compress_type, compressed_pages); |
2adcac1a | 301 | if (ret && ret != -ENOSPC) { |
79787eaa | 302 | btrfs_abort_transaction(trans, root, ret); |
00361589 | 303 | goto out; |
2adcac1a | 304 | } else if (ret == -ENOSPC) { |
00361589 JB |
305 | ret = 1; |
306 | goto out; | |
79787eaa | 307 | } |
2adcac1a | 308 | |
bdc20e67 | 309 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); |
0ca1f7ce | 310 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
a1ed835e | 311 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
00361589 | 312 | out: |
94ed938a QW |
313 | /* |
314 | * Don't forget to free the reserved space, as for inlined extent | |
315 | * it won't count as data extent, free them directly here. | |
316 | * And at reserve time, it's always aligned to page size, so | |
317 | * just free one page here. | |
318 | */ | |
319 | btrfs_qgroup_free_data(inode, 0, PAGE_CACHE_SIZE); | |
1acae57b | 320 | btrfs_free_path(path); |
00361589 JB |
321 | btrfs_end_transaction(trans, root); |
322 | return ret; | |
c8b97818 CM |
323 | } |
324 | ||
771ed689 CM |
325 | struct async_extent { |
326 | u64 start; | |
327 | u64 ram_size; | |
328 | u64 compressed_size; | |
329 | struct page **pages; | |
330 | unsigned long nr_pages; | |
261507a0 | 331 | int compress_type; |
771ed689 CM |
332 | struct list_head list; |
333 | }; | |
334 | ||
335 | struct async_cow { | |
336 | struct inode *inode; | |
337 | struct btrfs_root *root; | |
338 | struct page *locked_page; | |
339 | u64 start; | |
340 | u64 end; | |
341 | struct list_head extents; | |
342 | struct btrfs_work work; | |
343 | }; | |
344 | ||
345 | static noinline int add_async_extent(struct async_cow *cow, | |
346 | u64 start, u64 ram_size, | |
347 | u64 compressed_size, | |
348 | struct page **pages, | |
261507a0 LZ |
349 | unsigned long nr_pages, |
350 | int compress_type) | |
771ed689 CM |
351 | { |
352 | struct async_extent *async_extent; | |
353 | ||
354 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); | |
79787eaa | 355 | BUG_ON(!async_extent); /* -ENOMEM */ |
771ed689 CM |
356 | async_extent->start = start; |
357 | async_extent->ram_size = ram_size; | |
358 | async_extent->compressed_size = compressed_size; | |
359 | async_extent->pages = pages; | |
360 | async_extent->nr_pages = nr_pages; | |
261507a0 | 361 | async_extent->compress_type = compress_type; |
771ed689 CM |
362 | list_add_tail(&async_extent->list, &cow->extents); |
363 | return 0; | |
364 | } | |
365 | ||
f79707b0 WS |
366 | static inline int inode_need_compress(struct inode *inode) |
367 | { | |
368 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
369 | ||
370 | /* force compress */ | |
371 | if (btrfs_test_opt(root, FORCE_COMPRESS)) | |
372 | return 1; | |
373 | /* bad compression ratios */ | |
374 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) | |
375 | return 0; | |
376 | if (btrfs_test_opt(root, COMPRESS) || | |
377 | BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS || | |
378 | BTRFS_I(inode)->force_compress) | |
379 | return 1; | |
380 | return 0; | |
381 | } | |
382 | ||
d352ac68 | 383 | /* |
771ed689 CM |
384 | * we create compressed extents in two phases. The first |
385 | * phase compresses a range of pages that have already been | |
386 | * locked (both pages and state bits are locked). | |
c8b97818 | 387 | * |
771ed689 CM |
388 | * This is done inside an ordered work queue, and the compression |
389 | * is spread across many cpus. The actual IO submission is step | |
390 | * two, and the ordered work queue takes care of making sure that | |
391 | * happens in the same order things were put onto the queue by | |
392 | * writepages and friends. | |
c8b97818 | 393 | * |
771ed689 CM |
394 | * If this code finds it can't get good compression, it puts an |
395 | * entry onto the work queue to write the uncompressed bytes. This | |
396 | * makes sure that both compressed inodes and uncompressed inodes | |
b2570314 AB |
397 | * are written in the same order that the flusher thread sent them |
398 | * down. | |
d352ac68 | 399 | */ |
c44f649e | 400 | static noinline void compress_file_range(struct inode *inode, |
771ed689 CM |
401 | struct page *locked_page, |
402 | u64 start, u64 end, | |
403 | struct async_cow *async_cow, | |
404 | int *num_added) | |
b888db2b CM |
405 | { |
406 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
db94535d | 407 | u64 num_bytes; |
db94535d | 408 | u64 blocksize = root->sectorsize; |
c8b97818 | 409 | u64 actual_end; |
42dc7bab | 410 | u64 isize = i_size_read(inode); |
e6dcd2dc | 411 | int ret = 0; |
c8b97818 CM |
412 | struct page **pages = NULL; |
413 | unsigned long nr_pages; | |
414 | unsigned long nr_pages_ret = 0; | |
415 | unsigned long total_compressed = 0; | |
416 | unsigned long total_in = 0; | |
417 | unsigned long max_compressed = 128 * 1024; | |
771ed689 | 418 | unsigned long max_uncompressed = 128 * 1024; |
c8b97818 CM |
419 | int i; |
420 | int will_compress; | |
261507a0 | 421 | int compress_type = root->fs_info->compress_type; |
4adaa611 | 422 | int redirty = 0; |
b888db2b | 423 | |
4cb13e5d LB |
424 | /* if this is a small write inside eof, kick off a defrag */ |
425 | if ((end - start + 1) < 16 * 1024 && | |
426 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
4cb5300b CM |
427 | btrfs_add_inode_defrag(NULL, inode); |
428 | ||
42dc7bab | 429 | actual_end = min_t(u64, isize, end + 1); |
c8b97818 CM |
430 | again: |
431 | will_compress = 0; | |
432 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; | |
433 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); | |
be20aa9d | 434 | |
f03d9301 CM |
435 | /* |
436 | * we don't want to send crud past the end of i_size through | |
437 | * compression, that's just a waste of CPU time. So, if the | |
438 | * end of the file is before the start of our current | |
439 | * requested range of bytes, we bail out to the uncompressed | |
440 | * cleanup code that can deal with all of this. | |
441 | * | |
442 | * It isn't really the fastest way to fix things, but this is a | |
443 | * very uncommon corner. | |
444 | */ | |
445 | if (actual_end <= start) | |
446 | goto cleanup_and_bail_uncompressed; | |
447 | ||
c8b97818 CM |
448 | total_compressed = actual_end - start; |
449 | ||
4bcbb332 SW |
450 | /* |
451 | * skip compression for a small file range(<=blocksize) that | |
452 | * isn't an inline extent, since it dosen't save disk space at all. | |
453 | */ | |
454 | if (total_compressed <= blocksize && | |
455 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
456 | goto cleanup_and_bail_uncompressed; | |
457 | ||
c8b97818 CM |
458 | /* we want to make sure that amount of ram required to uncompress |
459 | * an extent is reasonable, so we limit the total size in ram | |
771ed689 CM |
460 | * of a compressed extent to 128k. This is a crucial number |
461 | * because it also controls how easily we can spread reads across | |
462 | * cpus for decompression. | |
463 | * | |
464 | * We also want to make sure the amount of IO required to do | |
465 | * a random read is reasonably small, so we limit the size of | |
466 | * a compressed extent to 128k. | |
c8b97818 CM |
467 | */ |
468 | total_compressed = min(total_compressed, max_uncompressed); | |
fda2832f | 469 | num_bytes = ALIGN(end - start + 1, blocksize); |
be20aa9d | 470 | num_bytes = max(blocksize, num_bytes); |
c8b97818 CM |
471 | total_in = 0; |
472 | ret = 0; | |
db94535d | 473 | |
771ed689 CM |
474 | /* |
475 | * we do compression for mount -o compress and when the | |
476 | * inode has not been flagged as nocompress. This flag can | |
477 | * change at any time if we discover bad compression ratios. | |
c8b97818 | 478 | */ |
f79707b0 | 479 | if (inode_need_compress(inode)) { |
c8b97818 | 480 | WARN_ON(pages); |
31e818fe | 481 | pages = kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); |
560f7d75 LZ |
482 | if (!pages) { |
483 | /* just bail out to the uncompressed code */ | |
484 | goto cont; | |
485 | } | |
c8b97818 | 486 | |
261507a0 LZ |
487 | if (BTRFS_I(inode)->force_compress) |
488 | compress_type = BTRFS_I(inode)->force_compress; | |
489 | ||
4adaa611 CM |
490 | /* |
491 | * we need to call clear_page_dirty_for_io on each | |
492 | * page in the range. Otherwise applications with the file | |
493 | * mmap'd can wander in and change the page contents while | |
494 | * we are compressing them. | |
495 | * | |
496 | * If the compression fails for any reason, we set the pages | |
497 | * dirty again later on. | |
498 | */ | |
499 | extent_range_clear_dirty_for_io(inode, start, end); | |
500 | redirty = 1; | |
261507a0 LZ |
501 | ret = btrfs_compress_pages(compress_type, |
502 | inode->i_mapping, start, | |
503 | total_compressed, pages, | |
504 | nr_pages, &nr_pages_ret, | |
505 | &total_in, | |
506 | &total_compressed, | |
507 | max_compressed); | |
c8b97818 CM |
508 | |
509 | if (!ret) { | |
510 | unsigned long offset = total_compressed & | |
511 | (PAGE_CACHE_SIZE - 1); | |
512 | struct page *page = pages[nr_pages_ret - 1]; | |
513 | char *kaddr; | |
514 | ||
515 | /* zero the tail end of the last page, we might be | |
516 | * sending it down to disk | |
517 | */ | |
518 | if (offset) { | |
7ac687d9 | 519 | kaddr = kmap_atomic(page); |
c8b97818 CM |
520 | memset(kaddr + offset, 0, |
521 | PAGE_CACHE_SIZE - offset); | |
7ac687d9 | 522 | kunmap_atomic(kaddr); |
c8b97818 CM |
523 | } |
524 | will_compress = 1; | |
525 | } | |
526 | } | |
560f7d75 | 527 | cont: |
c8b97818 CM |
528 | if (start == 0) { |
529 | /* lets try to make an inline extent */ | |
771ed689 | 530 | if (ret || total_in < (actual_end - start)) { |
c8b97818 | 531 | /* we didn't compress the entire range, try |
771ed689 | 532 | * to make an uncompressed inline extent. |
c8b97818 | 533 | */ |
00361589 JB |
534 | ret = cow_file_range_inline(root, inode, start, end, |
535 | 0, 0, NULL); | |
c8b97818 | 536 | } else { |
771ed689 | 537 | /* try making a compressed inline extent */ |
00361589 | 538 | ret = cow_file_range_inline(root, inode, start, end, |
fe3f566c LZ |
539 | total_compressed, |
540 | compress_type, pages); | |
c8b97818 | 541 | } |
79787eaa | 542 | if (ret <= 0) { |
151a41bc JB |
543 | unsigned long clear_flags = EXTENT_DELALLOC | |
544 | EXTENT_DEFRAG; | |
e6eb4314 FM |
545 | unsigned long page_error_op; |
546 | ||
151a41bc | 547 | clear_flags |= (ret < 0) ? EXTENT_DO_ACCOUNTING : 0; |
e6eb4314 | 548 | page_error_op = ret < 0 ? PAGE_SET_ERROR : 0; |
151a41bc | 549 | |
771ed689 | 550 | /* |
79787eaa JM |
551 | * inline extent creation worked or returned error, |
552 | * we don't need to create any more async work items. | |
553 | * Unlock and free up our temp pages. | |
771ed689 | 554 | */ |
c2790a2e | 555 | extent_clear_unlock_delalloc(inode, start, end, NULL, |
151a41bc | 556 | clear_flags, PAGE_UNLOCK | |
c2790a2e JB |
557 | PAGE_CLEAR_DIRTY | |
558 | PAGE_SET_WRITEBACK | | |
e6eb4314 | 559 | page_error_op | |
c2790a2e | 560 | PAGE_END_WRITEBACK); |
c8b97818 CM |
561 | goto free_pages_out; |
562 | } | |
563 | } | |
564 | ||
565 | if (will_compress) { | |
566 | /* | |
567 | * we aren't doing an inline extent round the compressed size | |
568 | * up to a block size boundary so the allocator does sane | |
569 | * things | |
570 | */ | |
fda2832f | 571 | total_compressed = ALIGN(total_compressed, blocksize); |
c8b97818 CM |
572 | |
573 | /* | |
574 | * one last check to make sure the compression is really a | |
575 | * win, compare the page count read with the blocks on disk | |
576 | */ | |
fda2832f | 577 | total_in = ALIGN(total_in, PAGE_CACHE_SIZE); |
c8b97818 CM |
578 | if (total_compressed >= total_in) { |
579 | will_compress = 0; | |
580 | } else { | |
c8b97818 CM |
581 | num_bytes = total_in; |
582 | } | |
583 | } | |
584 | if (!will_compress && pages) { | |
585 | /* | |
586 | * the compression code ran but failed to make things smaller, | |
587 | * free any pages it allocated and our page pointer array | |
588 | */ | |
589 | for (i = 0; i < nr_pages_ret; i++) { | |
70b99e69 | 590 | WARN_ON(pages[i]->mapping); |
c8b97818 CM |
591 | page_cache_release(pages[i]); |
592 | } | |
593 | kfree(pages); | |
594 | pages = NULL; | |
595 | total_compressed = 0; | |
596 | nr_pages_ret = 0; | |
597 | ||
598 | /* flag the file so we don't compress in the future */ | |
1e701a32 CM |
599 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
600 | !(BTRFS_I(inode)->force_compress)) { | |
a555f810 | 601 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
1e701a32 | 602 | } |
c8b97818 | 603 | } |
771ed689 CM |
604 | if (will_compress) { |
605 | *num_added += 1; | |
c8b97818 | 606 | |
771ed689 CM |
607 | /* the async work queues will take care of doing actual |
608 | * allocation on disk for these compressed pages, | |
609 | * and will submit them to the elevator. | |
610 | */ | |
611 | add_async_extent(async_cow, start, num_bytes, | |
261507a0 LZ |
612 | total_compressed, pages, nr_pages_ret, |
613 | compress_type); | |
179e29e4 | 614 | |
24ae6365 | 615 | if (start + num_bytes < end) { |
771ed689 CM |
616 | start += num_bytes; |
617 | pages = NULL; | |
618 | cond_resched(); | |
619 | goto again; | |
620 | } | |
621 | } else { | |
f03d9301 | 622 | cleanup_and_bail_uncompressed: |
771ed689 CM |
623 | /* |
624 | * No compression, but we still need to write the pages in | |
625 | * the file we've been given so far. redirty the locked | |
626 | * page if it corresponds to our extent and set things up | |
627 | * for the async work queue to run cow_file_range to do | |
628 | * the normal delalloc dance | |
629 | */ | |
630 | if (page_offset(locked_page) >= start && | |
631 | page_offset(locked_page) <= end) { | |
632 | __set_page_dirty_nobuffers(locked_page); | |
633 | /* unlocked later on in the async handlers */ | |
634 | } | |
4adaa611 CM |
635 | if (redirty) |
636 | extent_range_redirty_for_io(inode, start, end); | |
261507a0 LZ |
637 | add_async_extent(async_cow, start, end - start + 1, |
638 | 0, NULL, 0, BTRFS_COMPRESS_NONE); | |
771ed689 CM |
639 | *num_added += 1; |
640 | } | |
3b951516 | 641 | |
c44f649e | 642 | return; |
771ed689 CM |
643 | |
644 | free_pages_out: | |
645 | for (i = 0; i < nr_pages_ret; i++) { | |
646 | WARN_ON(pages[i]->mapping); | |
647 | page_cache_release(pages[i]); | |
648 | } | |
d397712b | 649 | kfree(pages); |
771ed689 | 650 | } |
771ed689 | 651 | |
40ae837b FM |
652 | static void free_async_extent_pages(struct async_extent *async_extent) |
653 | { | |
654 | int i; | |
655 | ||
656 | if (!async_extent->pages) | |
657 | return; | |
658 | ||
659 | for (i = 0; i < async_extent->nr_pages; i++) { | |
660 | WARN_ON(async_extent->pages[i]->mapping); | |
661 | page_cache_release(async_extent->pages[i]); | |
662 | } | |
663 | kfree(async_extent->pages); | |
664 | async_extent->nr_pages = 0; | |
665 | async_extent->pages = NULL; | |
771ed689 CM |
666 | } |
667 | ||
668 | /* | |
669 | * phase two of compressed writeback. This is the ordered portion | |
670 | * of the code, which only gets called in the order the work was | |
671 | * queued. We walk all the async extents created by compress_file_range | |
672 | * and send them down to the disk. | |
673 | */ | |
dec8f175 | 674 | static noinline void submit_compressed_extents(struct inode *inode, |
771ed689 CM |
675 | struct async_cow *async_cow) |
676 | { | |
677 | struct async_extent *async_extent; | |
678 | u64 alloc_hint = 0; | |
771ed689 CM |
679 | struct btrfs_key ins; |
680 | struct extent_map *em; | |
681 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
682 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
683 | struct extent_io_tree *io_tree; | |
f5a84ee3 | 684 | int ret = 0; |
771ed689 | 685 | |
3e04e7f1 | 686 | again: |
d397712b | 687 | while (!list_empty(&async_cow->extents)) { |
771ed689 CM |
688 | async_extent = list_entry(async_cow->extents.next, |
689 | struct async_extent, list); | |
690 | list_del(&async_extent->list); | |
c8b97818 | 691 | |
771ed689 CM |
692 | io_tree = &BTRFS_I(inode)->io_tree; |
693 | ||
f5a84ee3 | 694 | retry: |
771ed689 CM |
695 | /* did the compression code fall back to uncompressed IO? */ |
696 | if (!async_extent->pages) { | |
697 | int page_started = 0; | |
698 | unsigned long nr_written = 0; | |
699 | ||
700 | lock_extent(io_tree, async_extent->start, | |
2ac55d41 | 701 | async_extent->start + |
d0082371 | 702 | async_extent->ram_size - 1); |
771ed689 CM |
703 | |
704 | /* allocate blocks */ | |
f5a84ee3 JB |
705 | ret = cow_file_range(inode, async_cow->locked_page, |
706 | async_extent->start, | |
707 | async_extent->start + | |
708 | async_extent->ram_size - 1, | |
709 | &page_started, &nr_written, 0); | |
771ed689 | 710 | |
79787eaa JM |
711 | /* JDM XXX */ |
712 | ||
771ed689 CM |
713 | /* |
714 | * if page_started, cow_file_range inserted an | |
715 | * inline extent and took care of all the unlocking | |
716 | * and IO for us. Otherwise, we need to submit | |
717 | * all those pages down to the drive. | |
718 | */ | |
f5a84ee3 | 719 | if (!page_started && !ret) |
771ed689 CM |
720 | extent_write_locked_range(io_tree, |
721 | inode, async_extent->start, | |
d397712b | 722 | async_extent->start + |
771ed689 CM |
723 | async_extent->ram_size - 1, |
724 | btrfs_get_extent, | |
725 | WB_SYNC_ALL); | |
3e04e7f1 JB |
726 | else if (ret) |
727 | unlock_page(async_cow->locked_page); | |
771ed689 CM |
728 | kfree(async_extent); |
729 | cond_resched(); | |
730 | continue; | |
731 | } | |
732 | ||
733 | lock_extent(io_tree, async_extent->start, | |
d0082371 | 734 | async_extent->start + async_extent->ram_size - 1); |
771ed689 | 735 | |
00361589 | 736 | ret = btrfs_reserve_extent(root, |
771ed689 CM |
737 | async_extent->compressed_size, |
738 | async_extent->compressed_size, | |
e570fd27 | 739 | 0, alloc_hint, &ins, 1, 1); |
f5a84ee3 | 740 | if (ret) { |
40ae837b | 741 | free_async_extent_pages(async_extent); |
3e04e7f1 | 742 | |
fdf8e2ea JB |
743 | if (ret == -ENOSPC) { |
744 | unlock_extent(io_tree, async_extent->start, | |
745 | async_extent->start + | |
746 | async_extent->ram_size - 1); | |
ce62003f LB |
747 | |
748 | /* | |
749 | * we need to redirty the pages if we decide to | |
750 | * fallback to uncompressed IO, otherwise we | |
751 | * will not submit these pages down to lower | |
752 | * layers. | |
753 | */ | |
754 | extent_range_redirty_for_io(inode, | |
755 | async_extent->start, | |
756 | async_extent->start + | |
757 | async_extent->ram_size - 1); | |
758 | ||
79787eaa | 759 | goto retry; |
fdf8e2ea | 760 | } |
3e04e7f1 | 761 | goto out_free; |
f5a84ee3 | 762 | } |
c2167754 YZ |
763 | /* |
764 | * here we're doing allocation and writeback of the | |
765 | * compressed pages | |
766 | */ | |
767 | btrfs_drop_extent_cache(inode, async_extent->start, | |
768 | async_extent->start + | |
769 | async_extent->ram_size - 1, 0); | |
770 | ||
172ddd60 | 771 | em = alloc_extent_map(); |
b9aa55be LB |
772 | if (!em) { |
773 | ret = -ENOMEM; | |
3e04e7f1 | 774 | goto out_free_reserve; |
b9aa55be | 775 | } |
771ed689 CM |
776 | em->start = async_extent->start; |
777 | em->len = async_extent->ram_size; | |
445a6944 | 778 | em->orig_start = em->start; |
2ab28f32 JB |
779 | em->mod_start = em->start; |
780 | em->mod_len = em->len; | |
c8b97818 | 781 | |
771ed689 CM |
782 | em->block_start = ins.objectid; |
783 | em->block_len = ins.offset; | |
b4939680 | 784 | em->orig_block_len = ins.offset; |
cc95bef6 | 785 | em->ram_bytes = async_extent->ram_size; |
771ed689 | 786 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
261507a0 | 787 | em->compress_type = async_extent->compress_type; |
771ed689 CM |
788 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
789 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); | |
70c8a91c | 790 | em->generation = -1; |
771ed689 | 791 | |
d397712b | 792 | while (1) { |
890871be | 793 | write_lock(&em_tree->lock); |
09a2a8f9 | 794 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 795 | write_unlock(&em_tree->lock); |
771ed689 CM |
796 | if (ret != -EEXIST) { |
797 | free_extent_map(em); | |
798 | break; | |
799 | } | |
800 | btrfs_drop_extent_cache(inode, async_extent->start, | |
801 | async_extent->start + | |
802 | async_extent->ram_size - 1, 0); | |
803 | } | |
804 | ||
3e04e7f1 JB |
805 | if (ret) |
806 | goto out_free_reserve; | |
807 | ||
261507a0 LZ |
808 | ret = btrfs_add_ordered_extent_compress(inode, |
809 | async_extent->start, | |
810 | ins.objectid, | |
811 | async_extent->ram_size, | |
812 | ins.offset, | |
813 | BTRFS_ORDERED_COMPRESSED, | |
814 | async_extent->compress_type); | |
d9f85963 FM |
815 | if (ret) { |
816 | btrfs_drop_extent_cache(inode, async_extent->start, | |
817 | async_extent->start + | |
818 | async_extent->ram_size - 1, 0); | |
3e04e7f1 | 819 | goto out_free_reserve; |
d9f85963 | 820 | } |
771ed689 | 821 | |
771ed689 CM |
822 | /* |
823 | * clear dirty, set writeback and unlock the pages. | |
824 | */ | |
c2790a2e | 825 | extent_clear_unlock_delalloc(inode, async_extent->start, |
a791e35e CM |
826 | async_extent->start + |
827 | async_extent->ram_size - 1, | |
151a41bc JB |
828 | NULL, EXTENT_LOCKED | EXTENT_DELALLOC, |
829 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
c2790a2e | 830 | PAGE_SET_WRITEBACK); |
771ed689 | 831 | ret = btrfs_submit_compressed_write(inode, |
d397712b CM |
832 | async_extent->start, |
833 | async_extent->ram_size, | |
834 | ins.objectid, | |
835 | ins.offset, async_extent->pages, | |
836 | async_extent->nr_pages); | |
fce2a4e6 FM |
837 | if (ret) { |
838 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
839 | struct page *p = async_extent->pages[0]; | |
840 | const u64 start = async_extent->start; | |
841 | const u64 end = start + async_extent->ram_size - 1; | |
842 | ||
843 | p->mapping = inode->i_mapping; | |
844 | tree->ops->writepage_end_io_hook(p, start, end, | |
845 | NULL, 0); | |
846 | p->mapping = NULL; | |
847 | extent_clear_unlock_delalloc(inode, start, end, NULL, 0, | |
848 | PAGE_END_WRITEBACK | | |
849 | PAGE_SET_ERROR); | |
40ae837b | 850 | free_async_extent_pages(async_extent); |
fce2a4e6 | 851 | } |
771ed689 CM |
852 | alloc_hint = ins.objectid + ins.offset; |
853 | kfree(async_extent); | |
854 | cond_resched(); | |
855 | } | |
dec8f175 | 856 | return; |
3e04e7f1 | 857 | out_free_reserve: |
e570fd27 | 858 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
79787eaa | 859 | out_free: |
c2790a2e | 860 | extent_clear_unlock_delalloc(inode, async_extent->start, |
3e04e7f1 JB |
861 | async_extent->start + |
862 | async_extent->ram_size - 1, | |
c2790a2e | 863 | NULL, EXTENT_LOCKED | EXTENT_DELALLOC | |
151a41bc JB |
864 | EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING, |
865 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
704de49d FM |
866 | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK | |
867 | PAGE_SET_ERROR); | |
40ae837b | 868 | free_async_extent_pages(async_extent); |
79787eaa | 869 | kfree(async_extent); |
3e04e7f1 | 870 | goto again; |
771ed689 CM |
871 | } |
872 | ||
4b46fce2 JB |
873 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
874 | u64 num_bytes) | |
875 | { | |
876 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
877 | struct extent_map *em; | |
878 | u64 alloc_hint = 0; | |
879 | ||
880 | read_lock(&em_tree->lock); | |
881 | em = search_extent_mapping(em_tree, start, num_bytes); | |
882 | if (em) { | |
883 | /* | |
884 | * if block start isn't an actual block number then find the | |
885 | * first block in this inode and use that as a hint. If that | |
886 | * block is also bogus then just don't worry about it. | |
887 | */ | |
888 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { | |
889 | free_extent_map(em); | |
890 | em = search_extent_mapping(em_tree, 0, 0); | |
891 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) | |
892 | alloc_hint = em->block_start; | |
893 | if (em) | |
894 | free_extent_map(em); | |
895 | } else { | |
896 | alloc_hint = em->block_start; | |
897 | free_extent_map(em); | |
898 | } | |
899 | } | |
900 | read_unlock(&em_tree->lock); | |
901 | ||
902 | return alloc_hint; | |
903 | } | |
904 | ||
771ed689 CM |
905 | /* |
906 | * when extent_io.c finds a delayed allocation range in the file, | |
907 | * the call backs end up in this code. The basic idea is to | |
908 | * allocate extents on disk for the range, and create ordered data structs | |
909 | * in ram to track those extents. | |
910 | * | |
911 | * locked_page is the page that writepage had locked already. We use | |
912 | * it to make sure we don't do extra locks or unlocks. | |
913 | * | |
914 | * *page_started is set to one if we unlock locked_page and do everything | |
915 | * required to start IO on it. It may be clean and already done with | |
916 | * IO when we return. | |
917 | */ | |
00361589 JB |
918 | static noinline int cow_file_range(struct inode *inode, |
919 | struct page *locked_page, | |
920 | u64 start, u64 end, int *page_started, | |
921 | unsigned long *nr_written, | |
922 | int unlock) | |
771ed689 | 923 | { |
00361589 | 924 | struct btrfs_root *root = BTRFS_I(inode)->root; |
771ed689 CM |
925 | u64 alloc_hint = 0; |
926 | u64 num_bytes; | |
927 | unsigned long ram_size; | |
928 | u64 disk_num_bytes; | |
929 | u64 cur_alloc_size; | |
930 | u64 blocksize = root->sectorsize; | |
771ed689 CM |
931 | struct btrfs_key ins; |
932 | struct extent_map *em; | |
933 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
934 | int ret = 0; | |
935 | ||
02ecd2c2 JB |
936 | if (btrfs_is_free_space_inode(inode)) { |
937 | WARN_ON_ONCE(1); | |
29bce2f3 JB |
938 | ret = -EINVAL; |
939 | goto out_unlock; | |
02ecd2c2 | 940 | } |
771ed689 | 941 | |
fda2832f | 942 | num_bytes = ALIGN(end - start + 1, blocksize); |
771ed689 CM |
943 | num_bytes = max(blocksize, num_bytes); |
944 | disk_num_bytes = num_bytes; | |
771ed689 | 945 | |
4cb5300b | 946 | /* if this is a small write inside eof, kick off defrag */ |
4cb13e5d LB |
947 | if (num_bytes < 64 * 1024 && |
948 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
00361589 | 949 | btrfs_add_inode_defrag(NULL, inode); |
4cb5300b | 950 | |
771ed689 CM |
951 | if (start == 0) { |
952 | /* lets try to make an inline extent */ | |
00361589 JB |
953 | ret = cow_file_range_inline(root, inode, start, end, 0, 0, |
954 | NULL); | |
771ed689 | 955 | if (ret == 0) { |
c2790a2e JB |
956 | extent_clear_unlock_delalloc(inode, start, end, NULL, |
957 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc | 958 | EXTENT_DEFRAG, PAGE_UNLOCK | |
c2790a2e JB |
959 | PAGE_CLEAR_DIRTY | PAGE_SET_WRITEBACK | |
960 | PAGE_END_WRITEBACK); | |
c2167754 | 961 | |
771ed689 CM |
962 | *nr_written = *nr_written + |
963 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; | |
964 | *page_started = 1; | |
771ed689 | 965 | goto out; |
79787eaa | 966 | } else if (ret < 0) { |
79787eaa | 967 | goto out_unlock; |
771ed689 CM |
968 | } |
969 | } | |
970 | ||
971 | BUG_ON(disk_num_bytes > | |
6c41761f | 972 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
771ed689 | 973 | |
4b46fce2 | 974 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
771ed689 CM |
975 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
976 | ||
d397712b | 977 | while (disk_num_bytes > 0) { |
a791e35e CM |
978 | unsigned long op; |
979 | ||
287a0ab9 | 980 | cur_alloc_size = disk_num_bytes; |
00361589 | 981 | ret = btrfs_reserve_extent(root, cur_alloc_size, |
771ed689 | 982 | root->sectorsize, 0, alloc_hint, |
e570fd27 | 983 | &ins, 1, 1); |
00361589 | 984 | if (ret < 0) |
79787eaa | 985 | goto out_unlock; |
d397712b | 986 | |
172ddd60 | 987 | em = alloc_extent_map(); |
b9aa55be LB |
988 | if (!em) { |
989 | ret = -ENOMEM; | |
ace68bac | 990 | goto out_reserve; |
b9aa55be | 991 | } |
e6dcd2dc | 992 | em->start = start; |
445a6944 | 993 | em->orig_start = em->start; |
771ed689 CM |
994 | ram_size = ins.offset; |
995 | em->len = ins.offset; | |
2ab28f32 JB |
996 | em->mod_start = em->start; |
997 | em->mod_len = em->len; | |
c8b97818 | 998 | |
e6dcd2dc | 999 | em->block_start = ins.objectid; |
c8b97818 | 1000 | em->block_len = ins.offset; |
b4939680 | 1001 | em->orig_block_len = ins.offset; |
cc95bef6 | 1002 | em->ram_bytes = ram_size; |
e6dcd2dc | 1003 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
7f3c74fb | 1004 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
70c8a91c | 1005 | em->generation = -1; |
c8b97818 | 1006 | |
d397712b | 1007 | while (1) { |
890871be | 1008 | write_lock(&em_tree->lock); |
09a2a8f9 | 1009 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 1010 | write_unlock(&em_tree->lock); |
e6dcd2dc CM |
1011 | if (ret != -EEXIST) { |
1012 | free_extent_map(em); | |
1013 | break; | |
1014 | } | |
1015 | btrfs_drop_extent_cache(inode, start, | |
c8b97818 | 1016 | start + ram_size - 1, 0); |
e6dcd2dc | 1017 | } |
ace68bac LB |
1018 | if (ret) |
1019 | goto out_reserve; | |
e6dcd2dc | 1020 | |
98d20f67 | 1021 | cur_alloc_size = ins.offset; |
e6dcd2dc | 1022 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
771ed689 | 1023 | ram_size, cur_alloc_size, 0); |
ace68bac | 1024 | if (ret) |
d9f85963 | 1025 | goto out_drop_extent_cache; |
c8b97818 | 1026 | |
17d217fe YZ |
1027 | if (root->root_key.objectid == |
1028 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1029 | ret = btrfs_reloc_clone_csums(inode, start, | |
1030 | cur_alloc_size); | |
00361589 | 1031 | if (ret) |
d9f85963 | 1032 | goto out_drop_extent_cache; |
17d217fe YZ |
1033 | } |
1034 | ||
d397712b | 1035 | if (disk_num_bytes < cur_alloc_size) |
3b951516 | 1036 | break; |
d397712b | 1037 | |
c8b97818 CM |
1038 | /* we're not doing compressed IO, don't unlock the first |
1039 | * page (which the caller expects to stay locked), don't | |
1040 | * clear any dirty bits and don't set any writeback bits | |
8b62b72b CM |
1041 | * |
1042 | * Do set the Private2 bit so we know this page was properly | |
1043 | * setup for writepage | |
c8b97818 | 1044 | */ |
c2790a2e JB |
1045 | op = unlock ? PAGE_UNLOCK : 0; |
1046 | op |= PAGE_SET_PRIVATE2; | |
a791e35e | 1047 | |
c2790a2e JB |
1048 | extent_clear_unlock_delalloc(inode, start, |
1049 | start + ram_size - 1, locked_page, | |
1050 | EXTENT_LOCKED | EXTENT_DELALLOC, | |
1051 | op); | |
c8b97818 | 1052 | disk_num_bytes -= cur_alloc_size; |
c59f8951 CM |
1053 | num_bytes -= cur_alloc_size; |
1054 | alloc_hint = ins.objectid + ins.offset; | |
1055 | start += cur_alloc_size; | |
b888db2b | 1056 | } |
79787eaa | 1057 | out: |
be20aa9d | 1058 | return ret; |
b7d5b0a8 | 1059 | |
d9f85963 FM |
1060 | out_drop_extent_cache: |
1061 | btrfs_drop_extent_cache(inode, start, start + ram_size - 1, 0); | |
ace68bac | 1062 | out_reserve: |
e570fd27 | 1063 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
79787eaa | 1064 | out_unlock: |
c2790a2e | 1065 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
151a41bc JB |
1066 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | |
1067 | EXTENT_DELALLOC | EXTENT_DEFRAG, | |
1068 | PAGE_UNLOCK | PAGE_CLEAR_DIRTY | | |
1069 | PAGE_SET_WRITEBACK | PAGE_END_WRITEBACK); | |
79787eaa | 1070 | goto out; |
771ed689 | 1071 | } |
c8b97818 | 1072 | |
771ed689 CM |
1073 | /* |
1074 | * work queue call back to started compression on a file and pages | |
1075 | */ | |
1076 | static noinline void async_cow_start(struct btrfs_work *work) | |
1077 | { | |
1078 | struct async_cow *async_cow; | |
1079 | int num_added = 0; | |
1080 | async_cow = container_of(work, struct async_cow, work); | |
1081 | ||
1082 | compress_file_range(async_cow->inode, async_cow->locked_page, | |
1083 | async_cow->start, async_cow->end, async_cow, | |
1084 | &num_added); | |
8180ef88 | 1085 | if (num_added == 0) { |
cb77fcd8 | 1086 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 | 1087 | async_cow->inode = NULL; |
8180ef88 | 1088 | } |
771ed689 CM |
1089 | } |
1090 | ||
1091 | /* | |
1092 | * work queue call back to submit previously compressed pages | |
1093 | */ | |
1094 | static noinline void async_cow_submit(struct btrfs_work *work) | |
1095 | { | |
1096 | struct async_cow *async_cow; | |
1097 | struct btrfs_root *root; | |
1098 | unsigned long nr_pages; | |
1099 | ||
1100 | async_cow = container_of(work, struct async_cow, work); | |
1101 | ||
1102 | root = async_cow->root; | |
1103 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> | |
1104 | PAGE_CACHE_SHIFT; | |
1105 | ||
ee863954 DS |
1106 | /* |
1107 | * atomic_sub_return implies a barrier for waitqueue_active | |
1108 | */ | |
66657b31 | 1109 | if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) < |
287082b0 | 1110 | 5 * 1024 * 1024 && |
771ed689 CM |
1111 | waitqueue_active(&root->fs_info->async_submit_wait)) |
1112 | wake_up(&root->fs_info->async_submit_wait); | |
1113 | ||
d397712b | 1114 | if (async_cow->inode) |
771ed689 | 1115 | submit_compressed_extents(async_cow->inode, async_cow); |
771ed689 | 1116 | } |
c8b97818 | 1117 | |
771ed689 CM |
1118 | static noinline void async_cow_free(struct btrfs_work *work) |
1119 | { | |
1120 | struct async_cow *async_cow; | |
1121 | async_cow = container_of(work, struct async_cow, work); | |
8180ef88 | 1122 | if (async_cow->inode) |
cb77fcd8 | 1123 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 CM |
1124 | kfree(async_cow); |
1125 | } | |
1126 | ||
1127 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, | |
1128 | u64 start, u64 end, int *page_started, | |
1129 | unsigned long *nr_written) | |
1130 | { | |
1131 | struct async_cow *async_cow; | |
1132 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1133 | unsigned long nr_pages; | |
1134 | u64 cur_end; | |
287082b0 | 1135 | int limit = 10 * 1024 * 1024; |
771ed689 | 1136 | |
a3429ab7 CM |
1137 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
1138 | 1, 0, NULL, GFP_NOFS); | |
d397712b | 1139 | while (start < end) { |
771ed689 | 1140 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
79787eaa | 1141 | BUG_ON(!async_cow); /* -ENOMEM */ |
8180ef88 | 1142 | async_cow->inode = igrab(inode); |
771ed689 CM |
1143 | async_cow->root = root; |
1144 | async_cow->locked_page = locked_page; | |
1145 | async_cow->start = start; | |
1146 | ||
f79707b0 WS |
1147 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS && |
1148 | !btrfs_test_opt(root, FORCE_COMPRESS)) | |
771ed689 CM |
1149 | cur_end = end; |
1150 | else | |
1151 | cur_end = min(end, start + 512 * 1024 - 1); | |
1152 | ||
1153 | async_cow->end = cur_end; | |
1154 | INIT_LIST_HEAD(&async_cow->extents); | |
1155 | ||
9e0af237 LB |
1156 | btrfs_init_work(&async_cow->work, |
1157 | btrfs_delalloc_helper, | |
1158 | async_cow_start, async_cow_submit, | |
1159 | async_cow_free); | |
771ed689 | 1160 | |
771ed689 CM |
1161 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
1162 | PAGE_CACHE_SHIFT; | |
1163 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); | |
1164 | ||
afe3d242 QW |
1165 | btrfs_queue_work(root->fs_info->delalloc_workers, |
1166 | &async_cow->work); | |
771ed689 CM |
1167 | |
1168 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { | |
1169 | wait_event(root->fs_info->async_submit_wait, | |
1170 | (atomic_read(&root->fs_info->async_delalloc_pages) < | |
1171 | limit)); | |
1172 | } | |
1173 | ||
d397712b | 1174 | while (atomic_read(&root->fs_info->async_submit_draining) && |
771ed689 CM |
1175 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
1176 | wait_event(root->fs_info->async_submit_wait, | |
1177 | (atomic_read(&root->fs_info->async_delalloc_pages) == | |
1178 | 0)); | |
1179 | } | |
1180 | ||
1181 | *nr_written += nr_pages; | |
1182 | start = cur_end + 1; | |
1183 | } | |
1184 | *page_started = 1; | |
1185 | return 0; | |
be20aa9d CM |
1186 | } |
1187 | ||
d397712b | 1188 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
17d217fe YZ |
1189 | u64 bytenr, u64 num_bytes) |
1190 | { | |
1191 | int ret; | |
1192 | struct btrfs_ordered_sum *sums; | |
1193 | LIST_HEAD(list); | |
1194 | ||
07d400a6 | 1195 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
a2de733c | 1196 | bytenr + num_bytes - 1, &list, 0); |
17d217fe YZ |
1197 | if (ret == 0 && list_empty(&list)) |
1198 | return 0; | |
1199 | ||
1200 | while (!list_empty(&list)) { | |
1201 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
1202 | list_del(&sums->list); | |
1203 | kfree(sums); | |
1204 | } | |
1205 | return 1; | |
1206 | } | |
1207 | ||
d352ac68 CM |
1208 | /* |
1209 | * when nowcow writeback call back. This checks for snapshots or COW copies | |
1210 | * of the extents that exist in the file, and COWs the file as required. | |
1211 | * | |
1212 | * If no cow copies or snapshots exist, we write directly to the existing | |
1213 | * blocks on disk | |
1214 | */ | |
7f366cfe CM |
1215 | static noinline int run_delalloc_nocow(struct inode *inode, |
1216 | struct page *locked_page, | |
771ed689 CM |
1217 | u64 start, u64 end, int *page_started, int force, |
1218 | unsigned long *nr_written) | |
be20aa9d | 1219 | { |
be20aa9d | 1220 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7ea394f1 | 1221 | struct btrfs_trans_handle *trans; |
be20aa9d | 1222 | struct extent_buffer *leaf; |
be20aa9d | 1223 | struct btrfs_path *path; |
80ff3856 | 1224 | struct btrfs_file_extent_item *fi; |
be20aa9d | 1225 | struct btrfs_key found_key; |
80ff3856 YZ |
1226 | u64 cow_start; |
1227 | u64 cur_offset; | |
1228 | u64 extent_end; | |
5d4f98a2 | 1229 | u64 extent_offset; |
80ff3856 YZ |
1230 | u64 disk_bytenr; |
1231 | u64 num_bytes; | |
b4939680 | 1232 | u64 disk_num_bytes; |
cc95bef6 | 1233 | u64 ram_bytes; |
80ff3856 | 1234 | int extent_type; |
79787eaa | 1235 | int ret, err; |
d899e052 | 1236 | int type; |
80ff3856 YZ |
1237 | int nocow; |
1238 | int check_prev = 1; | |
82d5902d | 1239 | bool nolock; |
33345d01 | 1240 | u64 ino = btrfs_ino(inode); |
be20aa9d CM |
1241 | |
1242 | path = btrfs_alloc_path(); | |
17ca04af | 1243 | if (!path) { |
c2790a2e JB |
1244 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
1245 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc JB |
1246 | EXTENT_DO_ACCOUNTING | |
1247 | EXTENT_DEFRAG, PAGE_UNLOCK | | |
c2790a2e JB |
1248 | PAGE_CLEAR_DIRTY | |
1249 | PAGE_SET_WRITEBACK | | |
1250 | PAGE_END_WRITEBACK); | |
d8926bb3 | 1251 | return -ENOMEM; |
17ca04af | 1252 | } |
82d5902d | 1253 | |
83eea1f1 | 1254 | nolock = btrfs_is_free_space_inode(inode); |
82d5902d LZ |
1255 | |
1256 | if (nolock) | |
7a7eaa40 | 1257 | trans = btrfs_join_transaction_nolock(root); |
82d5902d | 1258 | else |
7a7eaa40 | 1259 | trans = btrfs_join_transaction(root); |
ff5714cc | 1260 | |
79787eaa | 1261 | if (IS_ERR(trans)) { |
c2790a2e JB |
1262 | extent_clear_unlock_delalloc(inode, start, end, locked_page, |
1263 | EXTENT_LOCKED | EXTENT_DELALLOC | | |
151a41bc JB |
1264 | EXTENT_DO_ACCOUNTING | |
1265 | EXTENT_DEFRAG, PAGE_UNLOCK | | |
c2790a2e JB |
1266 | PAGE_CLEAR_DIRTY | |
1267 | PAGE_SET_WRITEBACK | | |
1268 | PAGE_END_WRITEBACK); | |
79787eaa JM |
1269 | btrfs_free_path(path); |
1270 | return PTR_ERR(trans); | |
1271 | } | |
1272 | ||
74b21075 | 1273 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
be20aa9d | 1274 | |
80ff3856 YZ |
1275 | cow_start = (u64)-1; |
1276 | cur_offset = start; | |
1277 | while (1) { | |
33345d01 | 1278 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
80ff3856 | 1279 | cur_offset, 0); |
d788a349 | 1280 | if (ret < 0) |
79787eaa | 1281 | goto error; |
80ff3856 YZ |
1282 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
1283 | leaf = path->nodes[0]; | |
1284 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1285 | path->slots[0] - 1); | |
33345d01 | 1286 | if (found_key.objectid == ino && |
80ff3856 YZ |
1287 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
1288 | path->slots[0]--; | |
1289 | } | |
1290 | check_prev = 0; | |
1291 | next_slot: | |
1292 | leaf = path->nodes[0]; | |
1293 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1294 | ret = btrfs_next_leaf(root, path); | |
d788a349 | 1295 | if (ret < 0) |
79787eaa | 1296 | goto error; |
80ff3856 YZ |
1297 | if (ret > 0) |
1298 | break; | |
1299 | leaf = path->nodes[0]; | |
1300 | } | |
be20aa9d | 1301 | |
80ff3856 YZ |
1302 | nocow = 0; |
1303 | disk_bytenr = 0; | |
17d217fe | 1304 | num_bytes = 0; |
80ff3856 YZ |
1305 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1306 | ||
33345d01 | 1307 | if (found_key.objectid > ino || |
80ff3856 YZ |
1308 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
1309 | found_key.offset > end) | |
1310 | break; | |
1311 | ||
1312 | if (found_key.offset > cur_offset) { | |
1313 | extent_end = found_key.offset; | |
e9061e21 | 1314 | extent_type = 0; |
80ff3856 YZ |
1315 | goto out_check; |
1316 | } | |
1317 | ||
1318 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1319 | struct btrfs_file_extent_item); | |
1320 | extent_type = btrfs_file_extent_type(leaf, fi); | |
1321 | ||
cc95bef6 | 1322 | ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
d899e052 YZ |
1323 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
1324 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
80ff3856 | 1325 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 | 1326 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
80ff3856 YZ |
1327 | extent_end = found_key.offset + |
1328 | btrfs_file_extent_num_bytes(leaf, fi); | |
b4939680 JB |
1329 | disk_num_bytes = |
1330 | btrfs_file_extent_disk_num_bytes(leaf, fi); | |
80ff3856 YZ |
1331 | if (extent_end <= start) { |
1332 | path->slots[0]++; | |
1333 | goto next_slot; | |
1334 | } | |
17d217fe YZ |
1335 | if (disk_bytenr == 0) |
1336 | goto out_check; | |
80ff3856 YZ |
1337 | if (btrfs_file_extent_compression(leaf, fi) || |
1338 | btrfs_file_extent_encryption(leaf, fi) || | |
1339 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1340 | goto out_check; | |
d899e052 YZ |
1341 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
1342 | goto out_check; | |
d2fb3437 | 1343 | if (btrfs_extent_readonly(root, disk_bytenr)) |
80ff3856 | 1344 | goto out_check; |
33345d01 | 1345 | if (btrfs_cross_ref_exist(trans, root, ino, |
5d4f98a2 YZ |
1346 | found_key.offset - |
1347 | extent_offset, disk_bytenr)) | |
17d217fe | 1348 | goto out_check; |
5d4f98a2 | 1349 | disk_bytenr += extent_offset; |
17d217fe YZ |
1350 | disk_bytenr += cur_offset - found_key.offset; |
1351 | num_bytes = min(end + 1, extent_end) - cur_offset; | |
e9894fd3 WS |
1352 | /* |
1353 | * if there are pending snapshots for this root, | |
1354 | * we fall into common COW way. | |
1355 | */ | |
1356 | if (!nolock) { | |
9ea24bbe | 1357 | err = btrfs_start_write_no_snapshoting(root); |
e9894fd3 WS |
1358 | if (!err) |
1359 | goto out_check; | |
1360 | } | |
17d217fe YZ |
1361 | /* |
1362 | * force cow if csum exists in the range. | |
1363 | * this ensure that csum for a given extent are | |
1364 | * either valid or do not exist. | |
1365 | */ | |
1366 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
1367 | goto out_check; | |
80ff3856 YZ |
1368 | nocow = 1; |
1369 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1370 | extent_end = found_key.offset + | |
514ac8ad CM |
1371 | btrfs_file_extent_inline_len(leaf, |
1372 | path->slots[0], fi); | |
80ff3856 YZ |
1373 | extent_end = ALIGN(extent_end, root->sectorsize); |
1374 | } else { | |
1375 | BUG_ON(1); | |
1376 | } | |
1377 | out_check: | |
1378 | if (extent_end <= start) { | |
1379 | path->slots[0]++; | |
e9894fd3 | 1380 | if (!nolock && nocow) |
9ea24bbe | 1381 | btrfs_end_write_no_snapshoting(root); |
80ff3856 YZ |
1382 | goto next_slot; |
1383 | } | |
1384 | if (!nocow) { | |
1385 | if (cow_start == (u64)-1) | |
1386 | cow_start = cur_offset; | |
1387 | cur_offset = extent_end; | |
1388 | if (cur_offset > end) | |
1389 | break; | |
1390 | path->slots[0]++; | |
1391 | goto next_slot; | |
7ea394f1 YZ |
1392 | } |
1393 | ||
b3b4aa74 | 1394 | btrfs_release_path(path); |
80ff3856 | 1395 | if (cow_start != (u64)-1) { |
00361589 JB |
1396 | ret = cow_file_range(inode, locked_page, |
1397 | cow_start, found_key.offset - 1, | |
1398 | page_started, nr_written, 1); | |
e9894fd3 WS |
1399 | if (ret) { |
1400 | if (!nolock && nocow) | |
9ea24bbe | 1401 | btrfs_end_write_no_snapshoting(root); |
79787eaa | 1402 | goto error; |
e9894fd3 | 1403 | } |
80ff3856 | 1404 | cow_start = (u64)-1; |
7ea394f1 | 1405 | } |
80ff3856 | 1406 | |
d899e052 YZ |
1407 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
1408 | struct extent_map *em; | |
1409 | struct extent_map_tree *em_tree; | |
1410 | em_tree = &BTRFS_I(inode)->extent_tree; | |
172ddd60 | 1411 | em = alloc_extent_map(); |
79787eaa | 1412 | BUG_ON(!em); /* -ENOMEM */ |
d899e052 | 1413 | em->start = cur_offset; |
70c8a91c | 1414 | em->orig_start = found_key.offset - extent_offset; |
d899e052 YZ |
1415 | em->len = num_bytes; |
1416 | em->block_len = num_bytes; | |
1417 | em->block_start = disk_bytenr; | |
b4939680 | 1418 | em->orig_block_len = disk_num_bytes; |
cc95bef6 | 1419 | em->ram_bytes = ram_bytes; |
d899e052 | 1420 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
2ab28f32 JB |
1421 | em->mod_start = em->start; |
1422 | em->mod_len = em->len; | |
d899e052 | 1423 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
b11e234d | 1424 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
70c8a91c | 1425 | em->generation = -1; |
d899e052 | 1426 | while (1) { |
890871be | 1427 | write_lock(&em_tree->lock); |
09a2a8f9 | 1428 | ret = add_extent_mapping(em_tree, em, 1); |
890871be | 1429 | write_unlock(&em_tree->lock); |
d899e052 YZ |
1430 | if (ret != -EEXIST) { |
1431 | free_extent_map(em); | |
1432 | break; | |
1433 | } | |
1434 | btrfs_drop_extent_cache(inode, em->start, | |
1435 | em->start + em->len - 1, 0); | |
1436 | } | |
1437 | type = BTRFS_ORDERED_PREALLOC; | |
1438 | } else { | |
1439 | type = BTRFS_ORDERED_NOCOW; | |
1440 | } | |
80ff3856 YZ |
1441 | |
1442 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, | |
d899e052 | 1443 | num_bytes, num_bytes, type); |
79787eaa | 1444 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 1445 | |
efa56464 YZ |
1446 | if (root->root_key.objectid == |
1447 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1448 | ret = btrfs_reloc_clone_csums(inode, cur_offset, | |
1449 | num_bytes); | |
e9894fd3 WS |
1450 | if (ret) { |
1451 | if (!nolock && nocow) | |
9ea24bbe | 1452 | btrfs_end_write_no_snapshoting(root); |
79787eaa | 1453 | goto error; |
e9894fd3 | 1454 | } |
efa56464 YZ |
1455 | } |
1456 | ||
c2790a2e JB |
1457 | extent_clear_unlock_delalloc(inode, cur_offset, |
1458 | cur_offset + num_bytes - 1, | |
1459 | locked_page, EXTENT_LOCKED | | |
1460 | EXTENT_DELALLOC, PAGE_UNLOCK | | |
1461 | PAGE_SET_PRIVATE2); | |
e9894fd3 | 1462 | if (!nolock && nocow) |
9ea24bbe | 1463 | btrfs_end_write_no_snapshoting(root); |
80ff3856 YZ |
1464 | cur_offset = extent_end; |
1465 | if (cur_offset > end) | |
1466 | break; | |
be20aa9d | 1467 | } |
b3b4aa74 | 1468 | btrfs_release_path(path); |
80ff3856 | 1469 | |
17ca04af | 1470 | if (cur_offset <= end && cow_start == (u64)-1) { |
80ff3856 | 1471 | cow_start = cur_offset; |
17ca04af JB |
1472 | cur_offset = end; |
1473 | } | |
1474 | ||
80ff3856 | 1475 | if (cow_start != (u64)-1) { |
00361589 JB |
1476 | ret = cow_file_range(inode, locked_page, cow_start, end, |
1477 | page_started, nr_written, 1); | |
d788a349 | 1478 | if (ret) |
79787eaa | 1479 | goto error; |
80ff3856 YZ |
1480 | } |
1481 | ||
79787eaa | 1482 | error: |
a698d075 | 1483 | err = btrfs_end_transaction(trans, root); |
79787eaa JM |
1484 | if (!ret) |
1485 | ret = err; | |
1486 | ||
17ca04af | 1487 | if (ret && cur_offset < end) |
c2790a2e JB |
1488 | extent_clear_unlock_delalloc(inode, cur_offset, end, |
1489 | locked_page, EXTENT_LOCKED | | |
151a41bc JB |
1490 | EXTENT_DELALLOC | EXTENT_DEFRAG | |
1491 | EXTENT_DO_ACCOUNTING, PAGE_UNLOCK | | |
1492 | PAGE_CLEAR_DIRTY | | |
c2790a2e JB |
1493 | PAGE_SET_WRITEBACK | |
1494 | PAGE_END_WRITEBACK); | |
7ea394f1 | 1495 | btrfs_free_path(path); |
79787eaa | 1496 | return ret; |
be20aa9d CM |
1497 | } |
1498 | ||
47059d93 WS |
1499 | static inline int need_force_cow(struct inode *inode, u64 start, u64 end) |
1500 | { | |
1501 | ||
1502 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
1503 | !(BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC)) | |
1504 | return 0; | |
1505 | ||
1506 | /* | |
1507 | * @defrag_bytes is a hint value, no spinlock held here, | |
1508 | * if is not zero, it means the file is defragging. | |
1509 | * Force cow if given extent needs to be defragged. | |
1510 | */ | |
1511 | if (BTRFS_I(inode)->defrag_bytes && | |
1512 | test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
1513 | EXTENT_DEFRAG, 0, NULL)) | |
1514 | return 1; | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
d352ac68 CM |
1519 | /* |
1520 | * extent_io.c call back to do delayed allocation processing | |
1521 | */ | |
c8b97818 | 1522 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
771ed689 CM |
1523 | u64 start, u64 end, int *page_started, |
1524 | unsigned long *nr_written) | |
be20aa9d | 1525 | { |
be20aa9d | 1526 | int ret; |
47059d93 | 1527 | int force_cow = need_force_cow(inode, start, end); |
a2135011 | 1528 | |
47059d93 | 1529 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW && !force_cow) { |
c8b97818 | 1530 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1531 | page_started, 1, nr_written); |
47059d93 | 1532 | } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) { |
d899e052 | 1533 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1534 | page_started, 0, nr_written); |
7816030e | 1535 | } else if (!inode_need_compress(inode)) { |
7f366cfe CM |
1536 | ret = cow_file_range(inode, locked_page, start, end, |
1537 | page_started, nr_written, 1); | |
7ddf5a42 JB |
1538 | } else { |
1539 | set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
1540 | &BTRFS_I(inode)->runtime_flags); | |
771ed689 | 1541 | ret = cow_file_range_async(inode, locked_page, start, end, |
d397712b | 1542 | page_started, nr_written); |
7ddf5a42 | 1543 | } |
b888db2b CM |
1544 | return ret; |
1545 | } | |
1546 | ||
1bf85046 JM |
1547 | static void btrfs_split_extent_hook(struct inode *inode, |
1548 | struct extent_state *orig, u64 split) | |
9ed74f2d | 1549 | { |
dcab6a3b JB |
1550 | u64 size; |
1551 | ||
0ca1f7ce | 1552 | /* not delalloc, ignore it */ |
9ed74f2d | 1553 | if (!(orig->state & EXTENT_DELALLOC)) |
1bf85046 | 1554 | return; |
9ed74f2d | 1555 | |
dcab6a3b JB |
1556 | size = orig->end - orig->start + 1; |
1557 | if (size > BTRFS_MAX_EXTENT_SIZE) { | |
1558 | u64 num_extents; | |
1559 | u64 new_size; | |
1560 | ||
1561 | /* | |
ba117213 JB |
1562 | * See the explanation in btrfs_merge_extent_hook, the same |
1563 | * applies here, just in reverse. | |
dcab6a3b JB |
1564 | */ |
1565 | new_size = orig->end - split + 1; | |
ba117213 | 1566 | num_extents = div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, |
dcab6a3b | 1567 | BTRFS_MAX_EXTENT_SIZE); |
ba117213 JB |
1568 | new_size = split - orig->start; |
1569 | num_extents += div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1570 | BTRFS_MAX_EXTENT_SIZE); | |
1571 | if (div64_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1572 | BTRFS_MAX_EXTENT_SIZE) >= num_extents) | |
dcab6a3b JB |
1573 | return; |
1574 | } | |
1575 | ||
9e0baf60 JB |
1576 | spin_lock(&BTRFS_I(inode)->lock); |
1577 | BTRFS_I(inode)->outstanding_extents++; | |
1578 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1579 | } |
1580 | ||
1581 | /* | |
1582 | * extent_io.c merge_extent_hook, used to track merged delayed allocation | |
1583 | * extents so we can keep track of new extents that are just merged onto old | |
1584 | * extents, such as when we are doing sequential writes, so we can properly | |
1585 | * account for the metadata space we'll need. | |
1586 | */ | |
1bf85046 JM |
1587 | static void btrfs_merge_extent_hook(struct inode *inode, |
1588 | struct extent_state *new, | |
1589 | struct extent_state *other) | |
9ed74f2d | 1590 | { |
dcab6a3b JB |
1591 | u64 new_size, old_size; |
1592 | u64 num_extents; | |
1593 | ||
9ed74f2d JB |
1594 | /* not delalloc, ignore it */ |
1595 | if (!(other->state & EXTENT_DELALLOC)) | |
1bf85046 | 1596 | return; |
9ed74f2d | 1597 | |
8461a3de JB |
1598 | if (new->start > other->start) |
1599 | new_size = new->end - other->start + 1; | |
1600 | else | |
1601 | new_size = other->end - new->start + 1; | |
dcab6a3b JB |
1602 | |
1603 | /* we're not bigger than the max, unreserve the space and go */ | |
1604 | if (new_size <= BTRFS_MAX_EXTENT_SIZE) { | |
1605 | spin_lock(&BTRFS_I(inode)->lock); | |
1606 | BTRFS_I(inode)->outstanding_extents--; | |
1607 | spin_unlock(&BTRFS_I(inode)->lock); | |
1608 | return; | |
1609 | } | |
1610 | ||
1611 | /* | |
ba117213 JB |
1612 | * We have to add up either side to figure out how many extents were |
1613 | * accounted for before we merged into one big extent. If the number of | |
1614 | * extents we accounted for is <= the amount we need for the new range | |
1615 | * then we can return, otherwise drop. Think of it like this | |
1616 | * | |
1617 | * [ 4k][MAX_SIZE] | |
1618 | * | |
1619 | * So we've grown the extent by a MAX_SIZE extent, this would mean we | |
1620 | * need 2 outstanding extents, on one side we have 1 and the other side | |
1621 | * we have 1 so they are == and we can return. But in this case | |
1622 | * | |
1623 | * [MAX_SIZE+4k][MAX_SIZE+4k] | |
1624 | * | |
1625 | * Each range on their own accounts for 2 extents, but merged together | |
1626 | * they are only 3 extents worth of accounting, so we need to drop in | |
1627 | * this case. | |
dcab6a3b | 1628 | */ |
ba117213 | 1629 | old_size = other->end - other->start + 1; |
dcab6a3b JB |
1630 | num_extents = div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1, |
1631 | BTRFS_MAX_EXTENT_SIZE); | |
ba117213 JB |
1632 | old_size = new->end - new->start + 1; |
1633 | num_extents += div64_u64(old_size + BTRFS_MAX_EXTENT_SIZE - 1, | |
1634 | BTRFS_MAX_EXTENT_SIZE); | |
1635 | ||
dcab6a3b | 1636 | if (div64_u64(new_size + BTRFS_MAX_EXTENT_SIZE - 1, |
ba117213 | 1637 | BTRFS_MAX_EXTENT_SIZE) >= num_extents) |
dcab6a3b JB |
1638 | return; |
1639 | ||
9e0baf60 JB |
1640 | spin_lock(&BTRFS_I(inode)->lock); |
1641 | BTRFS_I(inode)->outstanding_extents--; | |
1642 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1643 | } |
1644 | ||
eb73c1b7 MX |
1645 | static void btrfs_add_delalloc_inodes(struct btrfs_root *root, |
1646 | struct inode *inode) | |
1647 | { | |
1648 | spin_lock(&root->delalloc_lock); | |
1649 | if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
1650 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, | |
1651 | &root->delalloc_inodes); | |
1652 | set_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
1653 | &BTRFS_I(inode)->runtime_flags); | |
1654 | root->nr_delalloc_inodes++; | |
1655 | if (root->nr_delalloc_inodes == 1) { | |
1656 | spin_lock(&root->fs_info->delalloc_root_lock); | |
1657 | BUG_ON(!list_empty(&root->delalloc_root)); | |
1658 | list_add_tail(&root->delalloc_root, | |
1659 | &root->fs_info->delalloc_roots); | |
1660 | spin_unlock(&root->fs_info->delalloc_root_lock); | |
1661 | } | |
1662 | } | |
1663 | spin_unlock(&root->delalloc_lock); | |
1664 | } | |
1665 | ||
1666 | static void btrfs_del_delalloc_inode(struct btrfs_root *root, | |
1667 | struct inode *inode) | |
1668 | { | |
1669 | spin_lock(&root->delalloc_lock); | |
1670 | if (!list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
1671 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
1672 | clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
1673 | &BTRFS_I(inode)->runtime_flags); | |
1674 | root->nr_delalloc_inodes--; | |
1675 | if (!root->nr_delalloc_inodes) { | |
1676 | spin_lock(&root->fs_info->delalloc_root_lock); | |
1677 | BUG_ON(list_empty(&root->delalloc_root)); | |
1678 | list_del_init(&root->delalloc_root); | |
1679 | spin_unlock(&root->fs_info->delalloc_root_lock); | |
1680 | } | |
1681 | } | |
1682 | spin_unlock(&root->delalloc_lock); | |
1683 | } | |
1684 | ||
d352ac68 CM |
1685 | /* |
1686 | * extent_io.c set_bit_hook, used to track delayed allocation | |
1687 | * bytes in this file, and to maintain the list of inodes that | |
1688 | * have pending delalloc work to be done. | |
1689 | */ | |
1bf85046 | 1690 | static void btrfs_set_bit_hook(struct inode *inode, |
9ee49a04 | 1691 | struct extent_state *state, unsigned *bits) |
291d673e | 1692 | { |
9ed74f2d | 1693 | |
47059d93 WS |
1694 | if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC)) |
1695 | WARN_ON(1); | |
75eff68e CM |
1696 | /* |
1697 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1698 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1699 | * bit, which is only set or cleared with irqs on |
1700 | */ | |
0ca1f7ce | 1701 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1702 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1703 | u64 len = state->end + 1 - state->start; |
83eea1f1 | 1704 | bool do_list = !btrfs_is_free_space_inode(inode); |
9ed74f2d | 1705 | |
9e0baf60 | 1706 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1707 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1708 | } else { |
1709 | spin_lock(&BTRFS_I(inode)->lock); | |
1710 | BTRFS_I(inode)->outstanding_extents++; | |
1711 | spin_unlock(&BTRFS_I(inode)->lock); | |
1712 | } | |
287a0ab9 | 1713 | |
6a3891c5 JB |
1714 | /* For sanity tests */ |
1715 | if (btrfs_test_is_dummy_root(root)) | |
1716 | return; | |
1717 | ||
963d678b MX |
1718 | __percpu_counter_add(&root->fs_info->delalloc_bytes, len, |
1719 | root->fs_info->delalloc_batch); | |
df0af1a5 | 1720 | spin_lock(&BTRFS_I(inode)->lock); |
0ca1f7ce | 1721 | BTRFS_I(inode)->delalloc_bytes += len; |
47059d93 WS |
1722 | if (*bits & EXTENT_DEFRAG) |
1723 | BTRFS_I(inode)->defrag_bytes += len; | |
df0af1a5 | 1724 | if (do_list && !test_bit(BTRFS_INODE_IN_DELALLOC_LIST, |
eb73c1b7 MX |
1725 | &BTRFS_I(inode)->runtime_flags)) |
1726 | btrfs_add_delalloc_inodes(root, inode); | |
df0af1a5 | 1727 | spin_unlock(&BTRFS_I(inode)->lock); |
291d673e | 1728 | } |
291d673e CM |
1729 | } |
1730 | ||
d352ac68 CM |
1731 | /* |
1732 | * extent_io.c clear_bit_hook, see set_bit_hook for why | |
1733 | */ | |
1bf85046 | 1734 | static void btrfs_clear_bit_hook(struct inode *inode, |
41074888 | 1735 | struct extent_state *state, |
9ee49a04 | 1736 | unsigned *bits) |
291d673e | 1737 | { |
47059d93 | 1738 | u64 len = state->end + 1 - state->start; |
dcab6a3b JB |
1739 | u64 num_extents = div64_u64(len + BTRFS_MAX_EXTENT_SIZE -1, |
1740 | BTRFS_MAX_EXTENT_SIZE); | |
47059d93 WS |
1741 | |
1742 | spin_lock(&BTRFS_I(inode)->lock); | |
1743 | if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) | |
1744 | BTRFS_I(inode)->defrag_bytes -= len; | |
1745 | spin_unlock(&BTRFS_I(inode)->lock); | |
1746 | ||
75eff68e CM |
1747 | /* |
1748 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1749 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1750 | * bit, which is only set or cleared with irqs on |
1751 | */ | |
0ca1f7ce | 1752 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1753 | struct btrfs_root *root = BTRFS_I(inode)->root; |
83eea1f1 | 1754 | bool do_list = !btrfs_is_free_space_inode(inode); |
bcbfce8a | 1755 | |
9e0baf60 | 1756 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1757 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1758 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
1759 | spin_lock(&BTRFS_I(inode)->lock); | |
dcab6a3b | 1760 | BTRFS_I(inode)->outstanding_extents -= num_extents; |
9e0baf60 JB |
1761 | spin_unlock(&BTRFS_I(inode)->lock); |
1762 | } | |
0ca1f7ce | 1763 | |
b6d08f06 JB |
1764 | /* |
1765 | * We don't reserve metadata space for space cache inodes so we | |
1766 | * don't need to call dellalloc_release_metadata if there is an | |
1767 | * error. | |
1768 | */ | |
1769 | if (*bits & EXTENT_DO_ACCOUNTING && | |
1770 | root != root->fs_info->tree_root) | |
0ca1f7ce YZ |
1771 | btrfs_delalloc_release_metadata(inode, len); |
1772 | ||
6a3891c5 JB |
1773 | /* For sanity tests. */ |
1774 | if (btrfs_test_is_dummy_root(root)) | |
1775 | return; | |
1776 | ||
0cb59c99 | 1777 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
7ee9e440 | 1778 | && do_list && !(state->state & EXTENT_NORESERVE)) |
51773bec QW |
1779 | btrfs_free_reserved_data_space_noquota(inode, |
1780 | state->start, len); | |
9ed74f2d | 1781 | |
963d678b MX |
1782 | __percpu_counter_add(&root->fs_info->delalloc_bytes, -len, |
1783 | root->fs_info->delalloc_batch); | |
df0af1a5 | 1784 | spin_lock(&BTRFS_I(inode)->lock); |
0ca1f7ce | 1785 | BTRFS_I(inode)->delalloc_bytes -= len; |
0cb59c99 | 1786 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
df0af1a5 | 1787 | test_bit(BTRFS_INODE_IN_DELALLOC_LIST, |
eb73c1b7 MX |
1788 | &BTRFS_I(inode)->runtime_flags)) |
1789 | btrfs_del_delalloc_inode(root, inode); | |
df0af1a5 | 1790 | spin_unlock(&BTRFS_I(inode)->lock); |
291d673e | 1791 | } |
291d673e CM |
1792 | } |
1793 | ||
d352ac68 CM |
1794 | /* |
1795 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure | |
1796 | * we don't create bios that span stripes or chunks | |
1797 | */ | |
64a16701 | 1798 | int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset, |
c8b97818 CM |
1799 | size_t size, struct bio *bio, |
1800 | unsigned long bio_flags) | |
239b14b3 CM |
1801 | { |
1802 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
4f024f37 | 1803 | u64 logical = (u64)bio->bi_iter.bi_sector << 9; |
239b14b3 CM |
1804 | u64 length = 0; |
1805 | u64 map_length; | |
239b14b3 CM |
1806 | int ret; |
1807 | ||
771ed689 CM |
1808 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
1809 | return 0; | |
1810 | ||
4f024f37 | 1811 | length = bio->bi_iter.bi_size; |
239b14b3 | 1812 | map_length = length; |
64a16701 | 1813 | ret = btrfs_map_block(root->fs_info, rw, logical, |
f188591e | 1814 | &map_length, NULL, 0); |
3ec706c8 | 1815 | /* Will always return 0 with map_multi == NULL */ |
3444a972 | 1816 | BUG_ON(ret < 0); |
d397712b | 1817 | if (map_length < length + size) |
239b14b3 | 1818 | return 1; |
3444a972 | 1819 | return 0; |
239b14b3 CM |
1820 | } |
1821 | ||
d352ac68 CM |
1822 | /* |
1823 | * in order to insert checksums into the metadata in large chunks, | |
1824 | * we wait until bio submission time. All the pages in the bio are | |
1825 | * checksummed and sums are attached onto the ordered extent record. | |
1826 | * | |
1827 | * At IO completion time the cums attached on the ordered extent record | |
1828 | * are inserted into the btree | |
1829 | */ | |
d397712b CM |
1830 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
1831 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
1832 | unsigned long bio_flags, |
1833 | u64 bio_offset) | |
065631f6 | 1834 | { |
065631f6 | 1835 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 1836 | int ret = 0; |
e015640f | 1837 | |
d20f7043 | 1838 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
79787eaa | 1839 | BUG_ON(ret); /* -ENOMEM */ |
4a69a410 CM |
1840 | return 0; |
1841 | } | |
e015640f | 1842 | |
4a69a410 CM |
1843 | /* |
1844 | * in order to insert checksums into the metadata in large chunks, | |
1845 | * we wait until bio submission time. All the pages in the bio are | |
1846 | * checksummed and sums are attached onto the ordered extent record. | |
1847 | * | |
1848 | * At IO completion time the cums attached on the ordered extent record | |
1849 | * are inserted into the btree | |
1850 | */ | |
b2950863 | 1851 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1852 | int mirror_num, unsigned long bio_flags, |
1853 | u64 bio_offset) | |
4a69a410 CM |
1854 | { |
1855 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
61891923 SB |
1856 | int ret; |
1857 | ||
1858 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 1); | |
4246a0b6 CH |
1859 | if (ret) { |
1860 | bio->bi_error = ret; | |
1861 | bio_endio(bio); | |
1862 | } | |
61891923 | 1863 | return ret; |
44b8bd7e CM |
1864 | } |
1865 | ||
d352ac68 | 1866 | /* |
cad321ad CM |
1867 | * extent_io.c submission hook. This does the right thing for csum calculation |
1868 | * on write, or reading the csums from the tree before a read | |
d352ac68 | 1869 | */ |
b2950863 | 1870 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1871 | int mirror_num, unsigned long bio_flags, |
1872 | u64 bio_offset) | |
44b8bd7e CM |
1873 | { |
1874 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
0d51e28a | 1875 | enum btrfs_wq_endio_type metadata = BTRFS_WQ_ENDIO_DATA; |
44b8bd7e | 1876 | int ret = 0; |
19b9bdb0 | 1877 | int skip_sum; |
b812ce28 | 1878 | int async = !atomic_read(&BTRFS_I(inode)->sync_writers); |
44b8bd7e | 1879 | |
6cbff00f | 1880 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
cad321ad | 1881 | |
83eea1f1 | 1882 | if (btrfs_is_free_space_inode(inode)) |
0d51e28a | 1883 | metadata = BTRFS_WQ_ENDIO_FREE_SPACE; |
0417341e | 1884 | |
7b6d91da | 1885 | if (!(rw & REQ_WRITE)) { |
5fd02043 JB |
1886 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata); |
1887 | if (ret) | |
61891923 | 1888 | goto out; |
5fd02043 | 1889 | |
d20f7043 | 1890 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
61891923 SB |
1891 | ret = btrfs_submit_compressed_read(inode, bio, |
1892 | mirror_num, | |
1893 | bio_flags); | |
1894 | goto out; | |
c2db1073 TI |
1895 | } else if (!skip_sum) { |
1896 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); | |
1897 | if (ret) | |
61891923 | 1898 | goto out; |
c2db1073 | 1899 | } |
4d1b5fb4 | 1900 | goto mapit; |
b812ce28 | 1901 | } else if (async && !skip_sum) { |
17d217fe YZ |
1902 | /* csum items have already been cloned */ |
1903 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
1904 | goto mapit; | |
19b9bdb0 | 1905 | /* we're doing a write, do the async checksumming */ |
61891923 | 1906 | ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
44b8bd7e | 1907 | inode, rw, bio, mirror_num, |
eaf25d93 CM |
1908 | bio_flags, bio_offset, |
1909 | __btrfs_submit_bio_start, | |
4a69a410 | 1910 | __btrfs_submit_bio_done); |
61891923 | 1911 | goto out; |
b812ce28 JB |
1912 | } else if (!skip_sum) { |
1913 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); | |
1914 | if (ret) | |
1915 | goto out; | |
19b9bdb0 CM |
1916 | } |
1917 | ||
0b86a832 | 1918 | mapit: |
61891923 SB |
1919 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); |
1920 | ||
1921 | out: | |
4246a0b6 CH |
1922 | if (ret < 0) { |
1923 | bio->bi_error = ret; | |
1924 | bio_endio(bio); | |
1925 | } | |
61891923 | 1926 | return ret; |
065631f6 | 1927 | } |
6885f308 | 1928 | |
d352ac68 CM |
1929 | /* |
1930 | * given a list of ordered sums record them in the inode. This happens | |
1931 | * at IO completion time based on sums calculated at bio submission time. | |
1932 | */ | |
ba1da2f4 | 1933 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
1934 | struct inode *inode, u64 file_offset, |
1935 | struct list_head *list) | |
1936 | { | |
e6dcd2dc CM |
1937 | struct btrfs_ordered_sum *sum; |
1938 | ||
c6e30871 | 1939 | list_for_each_entry(sum, list, list) { |
39847c4d | 1940 | trans->adding_csums = 1; |
d20f7043 CM |
1941 | btrfs_csum_file_blocks(trans, |
1942 | BTRFS_I(inode)->root->fs_info->csum_root, sum); | |
39847c4d | 1943 | trans->adding_csums = 0; |
e6dcd2dc CM |
1944 | } |
1945 | return 0; | |
1946 | } | |
1947 | ||
2ac55d41 JB |
1948 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
1949 | struct extent_state **cached_state) | |
ea8c2819 | 1950 | { |
6c1500f2 | 1951 | WARN_ON((end & (PAGE_CACHE_SIZE - 1)) == 0); |
ea8c2819 | 1952 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
2ac55d41 | 1953 | cached_state, GFP_NOFS); |
ea8c2819 CM |
1954 | } |
1955 | ||
d352ac68 | 1956 | /* see btrfs_writepage_start_hook for details on why this is required */ |
247e743c CM |
1957 | struct btrfs_writepage_fixup { |
1958 | struct page *page; | |
1959 | struct btrfs_work work; | |
1960 | }; | |
1961 | ||
b2950863 | 1962 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
247e743c CM |
1963 | { |
1964 | struct btrfs_writepage_fixup *fixup; | |
1965 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 1966 | struct extent_state *cached_state = NULL; |
247e743c CM |
1967 | struct page *page; |
1968 | struct inode *inode; | |
1969 | u64 page_start; | |
1970 | u64 page_end; | |
87826df0 | 1971 | int ret; |
247e743c CM |
1972 | |
1973 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
1974 | page = fixup->page; | |
4a096752 | 1975 | again: |
247e743c CM |
1976 | lock_page(page); |
1977 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
1978 | ClearPageChecked(page); | |
1979 | goto out_page; | |
1980 | } | |
1981 | ||
1982 | inode = page->mapping->host; | |
1983 | page_start = page_offset(page); | |
1984 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
1985 | ||
2ac55d41 | 1986 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
d0082371 | 1987 | &cached_state); |
4a096752 CM |
1988 | |
1989 | /* already ordered? We're done */ | |
8b62b72b | 1990 | if (PagePrivate2(page)) |
247e743c | 1991 | goto out; |
4a096752 CM |
1992 | |
1993 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1994 | if (ordered) { | |
2ac55d41 JB |
1995 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
1996 | page_end, &cached_state, GFP_NOFS); | |
4a096752 CM |
1997 | unlock_page(page); |
1998 | btrfs_start_ordered_extent(inode, ordered, 1); | |
87826df0 | 1999 | btrfs_put_ordered_extent(ordered); |
4a096752 CM |
2000 | goto again; |
2001 | } | |
247e743c | 2002 | |
7cf5b976 QW |
2003 | ret = btrfs_delalloc_reserve_space(inode, page_start, |
2004 | PAGE_CACHE_SIZE); | |
87826df0 JM |
2005 | if (ret) { |
2006 | mapping_set_error(page->mapping, ret); | |
2007 | end_extent_writepage(page, ret, page_start, page_end); | |
2008 | ClearPageChecked(page); | |
2009 | goto out; | |
2010 | } | |
2011 | ||
2ac55d41 | 2012 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
247e743c | 2013 | ClearPageChecked(page); |
87826df0 | 2014 | set_page_dirty(page); |
247e743c | 2015 | out: |
2ac55d41 JB |
2016 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
2017 | &cached_state, GFP_NOFS); | |
247e743c CM |
2018 | out_page: |
2019 | unlock_page(page); | |
2020 | page_cache_release(page); | |
b897abec | 2021 | kfree(fixup); |
247e743c CM |
2022 | } |
2023 | ||
2024 | /* | |
2025 | * There are a few paths in the higher layers of the kernel that directly | |
2026 | * set the page dirty bit without asking the filesystem if it is a | |
2027 | * good idea. This causes problems because we want to make sure COW | |
2028 | * properly happens and the data=ordered rules are followed. | |
2029 | * | |
c8b97818 | 2030 | * In our case any range that doesn't have the ORDERED bit set |
247e743c CM |
2031 | * hasn't been properly setup for IO. We kick off an async process |
2032 | * to fix it up. The async helper will wait for ordered extents, set | |
2033 | * the delalloc bit and make it safe to write the page. | |
2034 | */ | |
b2950863 | 2035 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
247e743c CM |
2036 | { |
2037 | struct inode *inode = page->mapping->host; | |
2038 | struct btrfs_writepage_fixup *fixup; | |
2039 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
247e743c | 2040 | |
8b62b72b CM |
2041 | /* this page is properly in the ordered list */ |
2042 | if (TestClearPagePrivate2(page)) | |
247e743c CM |
2043 | return 0; |
2044 | ||
2045 | if (PageChecked(page)) | |
2046 | return -EAGAIN; | |
2047 | ||
2048 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
2049 | if (!fixup) | |
2050 | return -EAGAIN; | |
f421950f | 2051 | |
247e743c CM |
2052 | SetPageChecked(page); |
2053 | page_cache_get(page); | |
9e0af237 LB |
2054 | btrfs_init_work(&fixup->work, btrfs_fixup_helper, |
2055 | btrfs_writepage_fixup_worker, NULL, NULL); | |
247e743c | 2056 | fixup->page = page; |
dc6e3209 | 2057 | btrfs_queue_work(root->fs_info->fixup_workers, &fixup->work); |
87826df0 | 2058 | return -EBUSY; |
247e743c CM |
2059 | } |
2060 | ||
d899e052 YZ |
2061 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
2062 | struct inode *inode, u64 file_pos, | |
2063 | u64 disk_bytenr, u64 disk_num_bytes, | |
2064 | u64 num_bytes, u64 ram_bytes, | |
2065 | u8 compression, u8 encryption, | |
2066 | u16 other_encoding, int extent_type) | |
2067 | { | |
2068 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2069 | struct btrfs_file_extent_item *fi; | |
2070 | struct btrfs_path *path; | |
2071 | struct extent_buffer *leaf; | |
2072 | struct btrfs_key ins; | |
1acae57b | 2073 | int extent_inserted = 0; |
d899e052 YZ |
2074 | int ret; |
2075 | ||
2076 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
2077 | if (!path) |
2078 | return -ENOMEM; | |
d899e052 | 2079 | |
a1ed835e CM |
2080 | /* |
2081 | * we may be replacing one extent in the tree with another. | |
2082 | * The new extent is pinned in the extent map, and we don't want | |
2083 | * to drop it from the cache until it is completely in the btree. | |
2084 | * | |
2085 | * So, tell btrfs_drop_extents to leave this extent in the cache. | |
2086 | * the caller is expected to unpin it and allow it to be merged | |
2087 | * with the others. | |
2088 | */ | |
1acae57b FDBM |
2089 | ret = __btrfs_drop_extents(trans, root, inode, path, file_pos, |
2090 | file_pos + num_bytes, NULL, 0, | |
2091 | 1, sizeof(*fi), &extent_inserted); | |
79787eaa JM |
2092 | if (ret) |
2093 | goto out; | |
d899e052 | 2094 | |
1acae57b FDBM |
2095 | if (!extent_inserted) { |
2096 | ins.objectid = btrfs_ino(inode); | |
2097 | ins.offset = file_pos; | |
2098 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
2099 | ||
2100 | path->leave_spinning = 1; | |
2101 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
2102 | sizeof(*fi)); | |
2103 | if (ret) | |
2104 | goto out; | |
2105 | } | |
d899e052 YZ |
2106 | leaf = path->nodes[0]; |
2107 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2108 | struct btrfs_file_extent_item); | |
2109 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
2110 | btrfs_set_file_extent_type(leaf, fi, extent_type); | |
2111 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); | |
2112 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); | |
2113 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
2114 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
2115 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); | |
2116 | btrfs_set_file_extent_compression(leaf, fi, compression); | |
2117 | btrfs_set_file_extent_encryption(leaf, fi, encryption); | |
2118 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); | |
b9473439 | 2119 | |
d899e052 | 2120 | btrfs_mark_buffer_dirty(leaf); |
ce195332 | 2121 | btrfs_release_path(path); |
d899e052 YZ |
2122 | |
2123 | inode_add_bytes(inode, num_bytes); | |
d899e052 YZ |
2124 | |
2125 | ins.objectid = disk_bytenr; | |
2126 | ins.offset = disk_num_bytes; | |
2127 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 YZ |
2128 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
2129 | root->root_key.objectid, | |
5846a3c2 QW |
2130 | btrfs_ino(inode), file_pos, |
2131 | ram_bytes, &ins); | |
297d750b | 2132 | /* |
5846a3c2 QW |
2133 | * Release the reserved range from inode dirty range map, as it is |
2134 | * already moved into delayed_ref_head | |
297d750b QW |
2135 | */ |
2136 | btrfs_qgroup_release_data(inode, file_pos, ram_bytes); | |
79787eaa | 2137 | out: |
d899e052 | 2138 | btrfs_free_path(path); |
b9473439 | 2139 | |
79787eaa | 2140 | return ret; |
d899e052 YZ |
2141 | } |
2142 | ||
38c227d8 LB |
2143 | /* snapshot-aware defrag */ |
2144 | struct sa_defrag_extent_backref { | |
2145 | struct rb_node node; | |
2146 | struct old_sa_defrag_extent *old; | |
2147 | u64 root_id; | |
2148 | u64 inum; | |
2149 | u64 file_pos; | |
2150 | u64 extent_offset; | |
2151 | u64 num_bytes; | |
2152 | u64 generation; | |
2153 | }; | |
2154 | ||
2155 | struct old_sa_defrag_extent { | |
2156 | struct list_head list; | |
2157 | struct new_sa_defrag_extent *new; | |
2158 | ||
2159 | u64 extent_offset; | |
2160 | u64 bytenr; | |
2161 | u64 offset; | |
2162 | u64 len; | |
2163 | int count; | |
2164 | }; | |
2165 | ||
2166 | struct new_sa_defrag_extent { | |
2167 | struct rb_root root; | |
2168 | struct list_head head; | |
2169 | struct btrfs_path *path; | |
2170 | struct inode *inode; | |
2171 | u64 file_pos; | |
2172 | u64 len; | |
2173 | u64 bytenr; | |
2174 | u64 disk_len; | |
2175 | u8 compress_type; | |
2176 | }; | |
2177 | ||
2178 | static int backref_comp(struct sa_defrag_extent_backref *b1, | |
2179 | struct sa_defrag_extent_backref *b2) | |
2180 | { | |
2181 | if (b1->root_id < b2->root_id) | |
2182 | return -1; | |
2183 | else if (b1->root_id > b2->root_id) | |
2184 | return 1; | |
2185 | ||
2186 | if (b1->inum < b2->inum) | |
2187 | return -1; | |
2188 | else if (b1->inum > b2->inum) | |
2189 | return 1; | |
2190 | ||
2191 | if (b1->file_pos < b2->file_pos) | |
2192 | return -1; | |
2193 | else if (b1->file_pos > b2->file_pos) | |
2194 | return 1; | |
2195 | ||
2196 | /* | |
2197 | * [------------------------------] ===> (a range of space) | |
2198 | * |<--->| |<---->| =============> (fs/file tree A) | |
2199 | * |<---------------------------->| ===> (fs/file tree B) | |
2200 | * | |
2201 | * A range of space can refer to two file extents in one tree while | |
2202 | * refer to only one file extent in another tree. | |
2203 | * | |
2204 | * So we may process a disk offset more than one time(two extents in A) | |
2205 | * and locate at the same extent(one extent in B), then insert two same | |
2206 | * backrefs(both refer to the extent in B). | |
2207 | */ | |
2208 | return 0; | |
2209 | } | |
2210 | ||
2211 | static void backref_insert(struct rb_root *root, | |
2212 | struct sa_defrag_extent_backref *backref) | |
2213 | { | |
2214 | struct rb_node **p = &root->rb_node; | |
2215 | struct rb_node *parent = NULL; | |
2216 | struct sa_defrag_extent_backref *entry; | |
2217 | int ret; | |
2218 | ||
2219 | while (*p) { | |
2220 | parent = *p; | |
2221 | entry = rb_entry(parent, struct sa_defrag_extent_backref, node); | |
2222 | ||
2223 | ret = backref_comp(backref, entry); | |
2224 | if (ret < 0) | |
2225 | p = &(*p)->rb_left; | |
2226 | else | |
2227 | p = &(*p)->rb_right; | |
2228 | } | |
2229 | ||
2230 | rb_link_node(&backref->node, parent, p); | |
2231 | rb_insert_color(&backref->node, root); | |
2232 | } | |
2233 | ||
2234 | /* | |
2235 | * Note the backref might has changed, and in this case we just return 0. | |
2236 | */ | |
2237 | static noinline int record_one_backref(u64 inum, u64 offset, u64 root_id, | |
2238 | void *ctx) | |
2239 | { | |
2240 | struct btrfs_file_extent_item *extent; | |
2241 | struct btrfs_fs_info *fs_info; | |
2242 | struct old_sa_defrag_extent *old = ctx; | |
2243 | struct new_sa_defrag_extent *new = old->new; | |
2244 | struct btrfs_path *path = new->path; | |
2245 | struct btrfs_key key; | |
2246 | struct btrfs_root *root; | |
2247 | struct sa_defrag_extent_backref *backref; | |
2248 | struct extent_buffer *leaf; | |
2249 | struct inode *inode = new->inode; | |
2250 | int slot; | |
2251 | int ret; | |
2252 | u64 extent_offset; | |
2253 | u64 num_bytes; | |
2254 | ||
2255 | if (BTRFS_I(inode)->root->root_key.objectid == root_id && | |
2256 | inum == btrfs_ino(inode)) | |
2257 | return 0; | |
2258 | ||
2259 | key.objectid = root_id; | |
2260 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2261 | key.offset = (u64)-1; | |
2262 | ||
2263 | fs_info = BTRFS_I(inode)->root->fs_info; | |
2264 | root = btrfs_read_fs_root_no_name(fs_info, &key); | |
2265 | if (IS_ERR(root)) { | |
2266 | if (PTR_ERR(root) == -ENOENT) | |
2267 | return 0; | |
2268 | WARN_ON(1); | |
2269 | pr_debug("inum=%llu, offset=%llu, root_id=%llu\n", | |
2270 | inum, offset, root_id); | |
2271 | return PTR_ERR(root); | |
2272 | } | |
2273 | ||
2274 | key.objectid = inum; | |
2275 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2276 | if (offset > (u64)-1 << 32) | |
2277 | key.offset = 0; | |
2278 | else | |
2279 | key.offset = offset; | |
2280 | ||
2281 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
fae7f21c | 2282 | if (WARN_ON(ret < 0)) |
38c227d8 | 2283 | return ret; |
50f1319c | 2284 | ret = 0; |
38c227d8 LB |
2285 | |
2286 | while (1) { | |
2287 | cond_resched(); | |
2288 | ||
2289 | leaf = path->nodes[0]; | |
2290 | slot = path->slots[0]; | |
2291 | ||
2292 | if (slot >= btrfs_header_nritems(leaf)) { | |
2293 | ret = btrfs_next_leaf(root, path); | |
2294 | if (ret < 0) { | |
2295 | goto out; | |
2296 | } else if (ret > 0) { | |
2297 | ret = 0; | |
2298 | goto out; | |
2299 | } | |
2300 | continue; | |
2301 | } | |
2302 | ||
2303 | path->slots[0]++; | |
2304 | ||
2305 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
2306 | ||
2307 | if (key.objectid > inum) | |
2308 | goto out; | |
2309 | ||
2310 | if (key.objectid < inum || key.type != BTRFS_EXTENT_DATA_KEY) | |
2311 | continue; | |
2312 | ||
2313 | extent = btrfs_item_ptr(leaf, slot, | |
2314 | struct btrfs_file_extent_item); | |
2315 | ||
2316 | if (btrfs_file_extent_disk_bytenr(leaf, extent) != old->bytenr) | |
2317 | continue; | |
2318 | ||
e68afa49 LB |
2319 | /* |
2320 | * 'offset' refers to the exact key.offset, | |
2321 | * NOT the 'offset' field in btrfs_extent_data_ref, ie. | |
2322 | * (key.offset - extent_offset). | |
2323 | */ | |
2324 | if (key.offset != offset) | |
38c227d8 LB |
2325 | continue; |
2326 | ||
e68afa49 | 2327 | extent_offset = btrfs_file_extent_offset(leaf, extent); |
38c227d8 | 2328 | num_bytes = btrfs_file_extent_num_bytes(leaf, extent); |
e68afa49 | 2329 | |
38c227d8 LB |
2330 | if (extent_offset >= old->extent_offset + old->offset + |
2331 | old->len || extent_offset + num_bytes <= | |
2332 | old->extent_offset + old->offset) | |
2333 | continue; | |
38c227d8 LB |
2334 | break; |
2335 | } | |
2336 | ||
2337 | backref = kmalloc(sizeof(*backref), GFP_NOFS); | |
2338 | if (!backref) { | |
2339 | ret = -ENOENT; | |
2340 | goto out; | |
2341 | } | |
2342 | ||
2343 | backref->root_id = root_id; | |
2344 | backref->inum = inum; | |
e68afa49 | 2345 | backref->file_pos = offset; |
38c227d8 LB |
2346 | backref->num_bytes = num_bytes; |
2347 | backref->extent_offset = extent_offset; | |
2348 | backref->generation = btrfs_file_extent_generation(leaf, extent); | |
2349 | backref->old = old; | |
2350 | backref_insert(&new->root, backref); | |
2351 | old->count++; | |
2352 | out: | |
2353 | btrfs_release_path(path); | |
2354 | WARN_ON(ret); | |
2355 | return ret; | |
2356 | } | |
2357 | ||
2358 | static noinline bool record_extent_backrefs(struct btrfs_path *path, | |
2359 | struct new_sa_defrag_extent *new) | |
2360 | { | |
2361 | struct btrfs_fs_info *fs_info = BTRFS_I(new->inode)->root->fs_info; | |
2362 | struct old_sa_defrag_extent *old, *tmp; | |
2363 | int ret; | |
2364 | ||
2365 | new->path = path; | |
2366 | ||
2367 | list_for_each_entry_safe(old, tmp, &new->head, list) { | |
e68afa49 LB |
2368 | ret = iterate_inodes_from_logical(old->bytenr + |
2369 | old->extent_offset, fs_info, | |
38c227d8 LB |
2370 | path, record_one_backref, |
2371 | old); | |
4724b106 JB |
2372 | if (ret < 0 && ret != -ENOENT) |
2373 | return false; | |
38c227d8 LB |
2374 | |
2375 | /* no backref to be processed for this extent */ | |
2376 | if (!old->count) { | |
2377 | list_del(&old->list); | |
2378 | kfree(old); | |
2379 | } | |
2380 | } | |
2381 | ||
2382 | if (list_empty(&new->head)) | |
2383 | return false; | |
2384 | ||
2385 | return true; | |
2386 | } | |
2387 | ||
2388 | static int relink_is_mergable(struct extent_buffer *leaf, | |
2389 | struct btrfs_file_extent_item *fi, | |
116e0024 | 2390 | struct new_sa_defrag_extent *new) |
38c227d8 | 2391 | { |
116e0024 | 2392 | if (btrfs_file_extent_disk_bytenr(leaf, fi) != new->bytenr) |
38c227d8 LB |
2393 | return 0; |
2394 | ||
2395 | if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG) | |
2396 | return 0; | |
2397 | ||
116e0024 LB |
2398 | if (btrfs_file_extent_compression(leaf, fi) != new->compress_type) |
2399 | return 0; | |
2400 | ||
2401 | if (btrfs_file_extent_encryption(leaf, fi) || | |
38c227d8 LB |
2402 | btrfs_file_extent_other_encoding(leaf, fi)) |
2403 | return 0; | |
2404 | ||
2405 | return 1; | |
2406 | } | |
2407 | ||
2408 | /* | |
2409 | * Note the backref might has changed, and in this case we just return 0. | |
2410 | */ | |
2411 | static noinline int relink_extent_backref(struct btrfs_path *path, | |
2412 | struct sa_defrag_extent_backref *prev, | |
2413 | struct sa_defrag_extent_backref *backref) | |
2414 | { | |
2415 | struct btrfs_file_extent_item *extent; | |
2416 | struct btrfs_file_extent_item *item; | |
2417 | struct btrfs_ordered_extent *ordered; | |
2418 | struct btrfs_trans_handle *trans; | |
2419 | struct btrfs_fs_info *fs_info; | |
2420 | struct btrfs_root *root; | |
2421 | struct btrfs_key key; | |
2422 | struct extent_buffer *leaf; | |
2423 | struct old_sa_defrag_extent *old = backref->old; | |
2424 | struct new_sa_defrag_extent *new = old->new; | |
2425 | struct inode *src_inode = new->inode; | |
2426 | struct inode *inode; | |
2427 | struct extent_state *cached = NULL; | |
2428 | int ret = 0; | |
2429 | u64 start; | |
2430 | u64 len; | |
2431 | u64 lock_start; | |
2432 | u64 lock_end; | |
2433 | bool merge = false; | |
2434 | int index; | |
2435 | ||
2436 | if (prev && prev->root_id == backref->root_id && | |
2437 | prev->inum == backref->inum && | |
2438 | prev->file_pos + prev->num_bytes == backref->file_pos) | |
2439 | merge = true; | |
2440 | ||
2441 | /* step 1: get root */ | |
2442 | key.objectid = backref->root_id; | |
2443 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2444 | key.offset = (u64)-1; | |
2445 | ||
2446 | fs_info = BTRFS_I(src_inode)->root->fs_info; | |
2447 | index = srcu_read_lock(&fs_info->subvol_srcu); | |
2448 | ||
2449 | root = btrfs_read_fs_root_no_name(fs_info, &key); | |
2450 | if (IS_ERR(root)) { | |
2451 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2452 | if (PTR_ERR(root) == -ENOENT) | |
2453 | return 0; | |
2454 | return PTR_ERR(root); | |
2455 | } | |
38c227d8 | 2456 | |
bcbba5e6 WS |
2457 | if (btrfs_root_readonly(root)) { |
2458 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2459 | return 0; | |
2460 | } | |
2461 | ||
38c227d8 LB |
2462 | /* step 2: get inode */ |
2463 | key.objectid = backref->inum; | |
2464 | key.type = BTRFS_INODE_ITEM_KEY; | |
2465 | key.offset = 0; | |
2466 | ||
2467 | inode = btrfs_iget(fs_info->sb, &key, root, NULL); | |
2468 | if (IS_ERR(inode)) { | |
2469 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2470 | return 0; | |
2471 | } | |
2472 | ||
2473 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
2474 | ||
2475 | /* step 3: relink backref */ | |
2476 | lock_start = backref->file_pos; | |
2477 | lock_end = backref->file_pos + backref->num_bytes - 1; | |
2478 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lock_start, lock_end, | |
2479 | 0, &cached); | |
2480 | ||
2481 | ordered = btrfs_lookup_first_ordered_extent(inode, lock_end); | |
2482 | if (ordered) { | |
2483 | btrfs_put_ordered_extent(ordered); | |
2484 | goto out_unlock; | |
2485 | } | |
2486 | ||
2487 | trans = btrfs_join_transaction(root); | |
2488 | if (IS_ERR(trans)) { | |
2489 | ret = PTR_ERR(trans); | |
2490 | goto out_unlock; | |
2491 | } | |
2492 | ||
2493 | key.objectid = backref->inum; | |
2494 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2495 | key.offset = backref->file_pos; | |
2496 | ||
2497 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2498 | if (ret < 0) { | |
2499 | goto out_free_path; | |
2500 | } else if (ret > 0) { | |
2501 | ret = 0; | |
2502 | goto out_free_path; | |
2503 | } | |
2504 | ||
2505 | extent = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2506 | struct btrfs_file_extent_item); | |
2507 | ||
2508 | if (btrfs_file_extent_generation(path->nodes[0], extent) != | |
2509 | backref->generation) | |
2510 | goto out_free_path; | |
2511 | ||
2512 | btrfs_release_path(path); | |
2513 | ||
2514 | start = backref->file_pos; | |
2515 | if (backref->extent_offset < old->extent_offset + old->offset) | |
2516 | start += old->extent_offset + old->offset - | |
2517 | backref->extent_offset; | |
2518 | ||
2519 | len = min(backref->extent_offset + backref->num_bytes, | |
2520 | old->extent_offset + old->offset + old->len); | |
2521 | len -= max(backref->extent_offset, old->extent_offset + old->offset); | |
2522 | ||
2523 | ret = btrfs_drop_extents(trans, root, inode, start, | |
2524 | start + len, 1); | |
2525 | if (ret) | |
2526 | goto out_free_path; | |
2527 | again: | |
2528 | key.objectid = btrfs_ino(inode); | |
2529 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2530 | key.offset = start; | |
2531 | ||
a09a0a70 | 2532 | path->leave_spinning = 1; |
38c227d8 LB |
2533 | if (merge) { |
2534 | struct btrfs_file_extent_item *fi; | |
2535 | u64 extent_len; | |
2536 | struct btrfs_key found_key; | |
2537 | ||
3c9665df | 2538 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
38c227d8 LB |
2539 | if (ret < 0) |
2540 | goto out_free_path; | |
2541 | ||
2542 | path->slots[0]--; | |
2543 | leaf = path->nodes[0]; | |
2544 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2545 | ||
2546 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
2547 | struct btrfs_file_extent_item); | |
2548 | extent_len = btrfs_file_extent_num_bytes(leaf, fi); | |
2549 | ||
116e0024 LB |
2550 | if (extent_len + found_key.offset == start && |
2551 | relink_is_mergable(leaf, fi, new)) { | |
38c227d8 LB |
2552 | btrfs_set_file_extent_num_bytes(leaf, fi, |
2553 | extent_len + len); | |
2554 | btrfs_mark_buffer_dirty(leaf); | |
2555 | inode_add_bytes(inode, len); | |
2556 | ||
2557 | ret = 1; | |
2558 | goto out_free_path; | |
2559 | } else { | |
2560 | merge = false; | |
2561 | btrfs_release_path(path); | |
2562 | goto again; | |
2563 | } | |
2564 | } | |
2565 | ||
2566 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
2567 | sizeof(*extent)); | |
2568 | if (ret) { | |
2569 | btrfs_abort_transaction(trans, root, ret); | |
2570 | goto out_free_path; | |
2571 | } | |
2572 | ||
2573 | leaf = path->nodes[0]; | |
2574 | item = btrfs_item_ptr(leaf, path->slots[0], | |
2575 | struct btrfs_file_extent_item); | |
2576 | btrfs_set_file_extent_disk_bytenr(leaf, item, new->bytenr); | |
2577 | btrfs_set_file_extent_disk_num_bytes(leaf, item, new->disk_len); | |
2578 | btrfs_set_file_extent_offset(leaf, item, start - new->file_pos); | |
2579 | btrfs_set_file_extent_num_bytes(leaf, item, len); | |
2580 | btrfs_set_file_extent_ram_bytes(leaf, item, new->len); | |
2581 | btrfs_set_file_extent_generation(leaf, item, trans->transid); | |
2582 | btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); | |
2583 | btrfs_set_file_extent_compression(leaf, item, new->compress_type); | |
2584 | btrfs_set_file_extent_encryption(leaf, item, 0); | |
2585 | btrfs_set_file_extent_other_encoding(leaf, item, 0); | |
2586 | ||
2587 | btrfs_mark_buffer_dirty(leaf); | |
2588 | inode_add_bytes(inode, len); | |
a09a0a70 | 2589 | btrfs_release_path(path); |
38c227d8 LB |
2590 | |
2591 | ret = btrfs_inc_extent_ref(trans, root, new->bytenr, | |
2592 | new->disk_len, 0, | |
2593 | backref->root_id, backref->inum, | |
b06c4bf5 | 2594 | new->file_pos); /* start - extent_offset */ |
38c227d8 LB |
2595 | if (ret) { |
2596 | btrfs_abort_transaction(trans, root, ret); | |
2597 | goto out_free_path; | |
2598 | } | |
2599 | ||
2600 | ret = 1; | |
2601 | out_free_path: | |
2602 | btrfs_release_path(path); | |
a09a0a70 | 2603 | path->leave_spinning = 0; |
38c227d8 LB |
2604 | btrfs_end_transaction(trans, root); |
2605 | out_unlock: | |
2606 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end, | |
2607 | &cached, GFP_NOFS); | |
2608 | iput(inode); | |
2609 | return ret; | |
2610 | } | |
2611 | ||
6f519564 LB |
2612 | static void free_sa_defrag_extent(struct new_sa_defrag_extent *new) |
2613 | { | |
2614 | struct old_sa_defrag_extent *old, *tmp; | |
2615 | ||
2616 | if (!new) | |
2617 | return; | |
2618 | ||
2619 | list_for_each_entry_safe(old, tmp, &new->head, list) { | |
6f519564 LB |
2620 | kfree(old); |
2621 | } | |
2622 | kfree(new); | |
2623 | } | |
2624 | ||
38c227d8 LB |
2625 | static void relink_file_extents(struct new_sa_defrag_extent *new) |
2626 | { | |
2627 | struct btrfs_path *path; | |
38c227d8 LB |
2628 | struct sa_defrag_extent_backref *backref; |
2629 | struct sa_defrag_extent_backref *prev = NULL; | |
2630 | struct inode *inode; | |
2631 | struct btrfs_root *root; | |
2632 | struct rb_node *node; | |
2633 | int ret; | |
2634 | ||
2635 | inode = new->inode; | |
2636 | root = BTRFS_I(inode)->root; | |
2637 | ||
2638 | path = btrfs_alloc_path(); | |
2639 | if (!path) | |
2640 | return; | |
2641 | ||
2642 | if (!record_extent_backrefs(path, new)) { | |
2643 | btrfs_free_path(path); | |
2644 | goto out; | |
2645 | } | |
2646 | btrfs_release_path(path); | |
2647 | ||
2648 | while (1) { | |
2649 | node = rb_first(&new->root); | |
2650 | if (!node) | |
2651 | break; | |
2652 | rb_erase(node, &new->root); | |
2653 | ||
2654 | backref = rb_entry(node, struct sa_defrag_extent_backref, node); | |
2655 | ||
2656 | ret = relink_extent_backref(path, prev, backref); | |
2657 | WARN_ON(ret < 0); | |
2658 | ||
2659 | kfree(prev); | |
2660 | ||
2661 | if (ret == 1) | |
2662 | prev = backref; | |
2663 | else | |
2664 | prev = NULL; | |
2665 | cond_resched(); | |
2666 | } | |
2667 | kfree(prev); | |
2668 | ||
2669 | btrfs_free_path(path); | |
38c227d8 | 2670 | out: |
6f519564 LB |
2671 | free_sa_defrag_extent(new); |
2672 | ||
38c227d8 LB |
2673 | atomic_dec(&root->fs_info->defrag_running); |
2674 | wake_up(&root->fs_info->transaction_wait); | |
38c227d8 LB |
2675 | } |
2676 | ||
2677 | static struct new_sa_defrag_extent * | |
2678 | record_old_file_extents(struct inode *inode, | |
2679 | struct btrfs_ordered_extent *ordered) | |
2680 | { | |
2681 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2682 | struct btrfs_path *path; | |
2683 | struct btrfs_key key; | |
6f519564 | 2684 | struct old_sa_defrag_extent *old; |
38c227d8 LB |
2685 | struct new_sa_defrag_extent *new; |
2686 | int ret; | |
2687 | ||
2688 | new = kmalloc(sizeof(*new), GFP_NOFS); | |
2689 | if (!new) | |
2690 | return NULL; | |
2691 | ||
2692 | new->inode = inode; | |
2693 | new->file_pos = ordered->file_offset; | |
2694 | new->len = ordered->len; | |
2695 | new->bytenr = ordered->start; | |
2696 | new->disk_len = ordered->disk_len; | |
2697 | new->compress_type = ordered->compress_type; | |
2698 | new->root = RB_ROOT; | |
2699 | INIT_LIST_HEAD(&new->head); | |
2700 | ||
2701 | path = btrfs_alloc_path(); | |
2702 | if (!path) | |
2703 | goto out_kfree; | |
2704 | ||
2705 | key.objectid = btrfs_ino(inode); | |
2706 | key.type = BTRFS_EXTENT_DATA_KEY; | |
2707 | key.offset = new->file_pos; | |
2708 | ||
2709 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2710 | if (ret < 0) | |
2711 | goto out_free_path; | |
2712 | if (ret > 0 && path->slots[0] > 0) | |
2713 | path->slots[0]--; | |
2714 | ||
2715 | /* find out all the old extents for the file range */ | |
2716 | while (1) { | |
2717 | struct btrfs_file_extent_item *extent; | |
2718 | struct extent_buffer *l; | |
2719 | int slot; | |
2720 | u64 num_bytes; | |
2721 | u64 offset; | |
2722 | u64 end; | |
2723 | u64 disk_bytenr; | |
2724 | u64 extent_offset; | |
2725 | ||
2726 | l = path->nodes[0]; | |
2727 | slot = path->slots[0]; | |
2728 | ||
2729 | if (slot >= btrfs_header_nritems(l)) { | |
2730 | ret = btrfs_next_leaf(root, path); | |
2731 | if (ret < 0) | |
6f519564 | 2732 | goto out_free_path; |
38c227d8 LB |
2733 | else if (ret > 0) |
2734 | break; | |
2735 | continue; | |
2736 | } | |
2737 | ||
2738 | btrfs_item_key_to_cpu(l, &key, slot); | |
2739 | ||
2740 | if (key.objectid != btrfs_ino(inode)) | |
2741 | break; | |
2742 | if (key.type != BTRFS_EXTENT_DATA_KEY) | |
2743 | break; | |
2744 | if (key.offset >= new->file_pos + new->len) | |
2745 | break; | |
2746 | ||
2747 | extent = btrfs_item_ptr(l, slot, struct btrfs_file_extent_item); | |
2748 | ||
2749 | num_bytes = btrfs_file_extent_num_bytes(l, extent); | |
2750 | if (key.offset + num_bytes < new->file_pos) | |
2751 | goto next; | |
2752 | ||
2753 | disk_bytenr = btrfs_file_extent_disk_bytenr(l, extent); | |
2754 | if (!disk_bytenr) | |
2755 | goto next; | |
2756 | ||
2757 | extent_offset = btrfs_file_extent_offset(l, extent); | |
2758 | ||
2759 | old = kmalloc(sizeof(*old), GFP_NOFS); | |
2760 | if (!old) | |
6f519564 | 2761 | goto out_free_path; |
38c227d8 LB |
2762 | |
2763 | offset = max(new->file_pos, key.offset); | |
2764 | end = min(new->file_pos + new->len, key.offset + num_bytes); | |
2765 | ||
2766 | old->bytenr = disk_bytenr; | |
2767 | old->extent_offset = extent_offset; | |
2768 | old->offset = offset - key.offset; | |
2769 | old->len = end - offset; | |
2770 | old->new = new; | |
2771 | old->count = 0; | |
2772 | list_add_tail(&old->list, &new->head); | |
2773 | next: | |
2774 | path->slots[0]++; | |
2775 | cond_resched(); | |
2776 | } | |
2777 | ||
2778 | btrfs_free_path(path); | |
2779 | atomic_inc(&root->fs_info->defrag_running); | |
2780 | ||
2781 | return new; | |
2782 | ||
38c227d8 LB |
2783 | out_free_path: |
2784 | btrfs_free_path(path); | |
2785 | out_kfree: | |
6f519564 | 2786 | free_sa_defrag_extent(new); |
38c227d8 LB |
2787 | return NULL; |
2788 | } | |
2789 | ||
e570fd27 MX |
2790 | static void btrfs_release_delalloc_bytes(struct btrfs_root *root, |
2791 | u64 start, u64 len) | |
2792 | { | |
2793 | struct btrfs_block_group_cache *cache; | |
2794 | ||
2795 | cache = btrfs_lookup_block_group(root->fs_info, start); | |
2796 | ASSERT(cache); | |
2797 | ||
2798 | spin_lock(&cache->lock); | |
2799 | cache->delalloc_bytes -= len; | |
2800 | spin_unlock(&cache->lock); | |
2801 | ||
2802 | btrfs_put_block_group(cache); | |
2803 | } | |
2804 | ||
d352ac68 CM |
2805 | /* as ordered data IO finishes, this gets called so we can finish |
2806 | * an ordered extent if the range of bytes in the file it covers are | |
2807 | * fully written. | |
2808 | */ | |
5fd02043 | 2809 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) |
e6dcd2dc | 2810 | { |
5fd02043 | 2811 | struct inode *inode = ordered_extent->inode; |
e6dcd2dc | 2812 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 2813 | struct btrfs_trans_handle *trans = NULL; |
e6dcd2dc | 2814 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2ac55d41 | 2815 | struct extent_state *cached_state = NULL; |
38c227d8 | 2816 | struct new_sa_defrag_extent *new = NULL; |
261507a0 | 2817 | int compress_type = 0; |
77cef2ec JB |
2818 | int ret = 0; |
2819 | u64 logical_len = ordered_extent->len; | |
82d5902d | 2820 | bool nolock; |
77cef2ec | 2821 | bool truncated = false; |
e6dcd2dc | 2822 | |
83eea1f1 | 2823 | nolock = btrfs_is_free_space_inode(inode); |
0cb59c99 | 2824 | |
5fd02043 JB |
2825 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) { |
2826 | ret = -EIO; | |
2827 | goto out; | |
2828 | } | |
2829 | ||
f612496b MX |
2830 | btrfs_free_io_failure_record(inode, ordered_extent->file_offset, |
2831 | ordered_extent->file_offset + | |
2832 | ordered_extent->len - 1); | |
2833 | ||
77cef2ec JB |
2834 | if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered_extent->flags)) { |
2835 | truncated = true; | |
2836 | logical_len = ordered_extent->truncated_len; | |
2837 | /* Truncated the entire extent, don't bother adding */ | |
2838 | if (!logical_len) | |
2839 | goto out; | |
2840 | } | |
2841 | ||
c2167754 | 2842 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
79787eaa | 2843 | BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */ |
94ed938a QW |
2844 | |
2845 | /* | |
2846 | * For mwrite(mmap + memset to write) case, we still reserve | |
2847 | * space for NOCOW range. | |
2848 | * As NOCOW won't cause a new delayed ref, just free the space | |
2849 | */ | |
2850 | btrfs_qgroup_free_data(inode, ordered_extent->file_offset, | |
2851 | ordered_extent->len); | |
6c760c07 JB |
2852 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
2853 | if (nolock) | |
2854 | trans = btrfs_join_transaction_nolock(root); | |
2855 | else | |
2856 | trans = btrfs_join_transaction(root); | |
2857 | if (IS_ERR(trans)) { | |
2858 | ret = PTR_ERR(trans); | |
2859 | trans = NULL; | |
2860 | goto out; | |
c2167754 | 2861 | } |
6c760c07 JB |
2862 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
2863 | ret = btrfs_update_inode_fallback(trans, root, inode); | |
2864 | if (ret) /* -ENOMEM or corruption */ | |
2865 | btrfs_abort_transaction(trans, root, ret); | |
c2167754 YZ |
2866 | goto out; |
2867 | } | |
e6dcd2dc | 2868 | |
2ac55d41 JB |
2869 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
2870 | ordered_extent->file_offset + ordered_extent->len - 1, | |
d0082371 | 2871 | 0, &cached_state); |
e6dcd2dc | 2872 | |
38c227d8 LB |
2873 | ret = test_range_bit(io_tree, ordered_extent->file_offset, |
2874 | ordered_extent->file_offset + ordered_extent->len - 1, | |
2875 | EXTENT_DEFRAG, 1, cached_state); | |
2876 | if (ret) { | |
2877 | u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item); | |
8101c8db | 2878 | if (0 && last_snapshot >= BTRFS_I(inode)->generation) |
38c227d8 LB |
2879 | /* the inode is shared */ |
2880 | new = record_old_file_extents(inode, ordered_extent); | |
2881 | ||
2882 | clear_extent_bit(io_tree, ordered_extent->file_offset, | |
2883 | ordered_extent->file_offset + ordered_extent->len - 1, | |
2884 | EXTENT_DEFRAG, 0, 0, &cached_state, GFP_NOFS); | |
2885 | } | |
2886 | ||
0cb59c99 | 2887 | if (nolock) |
7a7eaa40 | 2888 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 2889 | else |
7a7eaa40 | 2890 | trans = btrfs_join_transaction(root); |
79787eaa JM |
2891 | if (IS_ERR(trans)) { |
2892 | ret = PTR_ERR(trans); | |
2893 | trans = NULL; | |
2894 | goto out_unlock; | |
2895 | } | |
a79b7d4b | 2896 | |
0ca1f7ce | 2897 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
c2167754 | 2898 | |
c8b97818 | 2899 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
261507a0 | 2900 | compress_type = ordered_extent->compress_type; |
d899e052 | 2901 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
261507a0 | 2902 | BUG_ON(compress_type); |
920bbbfb | 2903 | ret = btrfs_mark_extent_written(trans, inode, |
d899e052 YZ |
2904 | ordered_extent->file_offset, |
2905 | ordered_extent->file_offset + | |
77cef2ec | 2906 | logical_len); |
d899e052 | 2907 | } else { |
0af3d00b | 2908 | BUG_ON(root == root->fs_info->tree_root); |
d899e052 YZ |
2909 | ret = insert_reserved_file_extent(trans, inode, |
2910 | ordered_extent->file_offset, | |
2911 | ordered_extent->start, | |
2912 | ordered_extent->disk_len, | |
77cef2ec | 2913 | logical_len, logical_len, |
261507a0 | 2914 | compress_type, 0, 0, |
d899e052 | 2915 | BTRFS_FILE_EXTENT_REG); |
e570fd27 MX |
2916 | if (!ret) |
2917 | btrfs_release_delalloc_bytes(root, | |
2918 | ordered_extent->start, | |
2919 | ordered_extent->disk_len); | |
d899e052 | 2920 | } |
5dc562c5 JB |
2921 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
2922 | ordered_extent->file_offset, ordered_extent->len, | |
2923 | trans->transid); | |
79787eaa JM |
2924 | if (ret < 0) { |
2925 | btrfs_abort_transaction(trans, root, ret); | |
5fd02043 | 2926 | goto out_unlock; |
79787eaa | 2927 | } |
2ac55d41 | 2928 | |
e6dcd2dc CM |
2929 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
2930 | &ordered_extent->list); | |
2931 | ||
6c760c07 JB |
2932 | btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
2933 | ret = btrfs_update_inode_fallback(trans, root, inode); | |
2934 | if (ret) { /* -ENOMEM or corruption */ | |
2935 | btrfs_abort_transaction(trans, root, ret); | |
2936 | goto out_unlock; | |
1ef30be1 JB |
2937 | } |
2938 | ret = 0; | |
5fd02043 JB |
2939 | out_unlock: |
2940 | unlock_extent_cached(io_tree, ordered_extent->file_offset, | |
2941 | ordered_extent->file_offset + | |
2942 | ordered_extent->len - 1, &cached_state, GFP_NOFS); | |
c2167754 | 2943 | out: |
5b0e95bf | 2944 | if (root != root->fs_info->tree_root) |
0cb59c99 | 2945 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
a698d075 MX |
2946 | if (trans) |
2947 | btrfs_end_transaction(trans, root); | |
0cb59c99 | 2948 | |
77cef2ec JB |
2949 | if (ret || truncated) { |
2950 | u64 start, end; | |
2951 | ||
2952 | if (truncated) | |
2953 | start = ordered_extent->file_offset + logical_len; | |
2954 | else | |
2955 | start = ordered_extent->file_offset; | |
2956 | end = ordered_extent->file_offset + ordered_extent->len - 1; | |
2957 | clear_extent_uptodate(io_tree, start, end, NULL, GFP_NOFS); | |
2958 | ||
2959 | /* Drop the cache for the part of the extent we didn't write. */ | |
2960 | btrfs_drop_extent_cache(inode, start, end, 0); | |
5fd02043 | 2961 | |
0bec9ef5 JB |
2962 | /* |
2963 | * If the ordered extent had an IOERR or something else went | |
2964 | * wrong we need to return the space for this ordered extent | |
77cef2ec JB |
2965 | * back to the allocator. We only free the extent in the |
2966 | * truncated case if we didn't write out the extent at all. | |
0bec9ef5 | 2967 | */ |
77cef2ec JB |
2968 | if ((ret || !logical_len) && |
2969 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags) && | |
0bec9ef5 JB |
2970 | !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) |
2971 | btrfs_free_reserved_extent(root, ordered_extent->start, | |
e570fd27 | 2972 | ordered_extent->disk_len, 1); |
0bec9ef5 JB |
2973 | } |
2974 | ||
2975 | ||
5fd02043 | 2976 | /* |
8bad3c02 LB |
2977 | * This needs to be done to make sure anybody waiting knows we are done |
2978 | * updating everything for this ordered extent. | |
5fd02043 JB |
2979 | */ |
2980 | btrfs_remove_ordered_extent(inode, ordered_extent); | |
2981 | ||
38c227d8 | 2982 | /* for snapshot-aware defrag */ |
6f519564 LB |
2983 | if (new) { |
2984 | if (ret) { | |
2985 | free_sa_defrag_extent(new); | |
2986 | atomic_dec(&root->fs_info->defrag_running); | |
2987 | } else { | |
2988 | relink_file_extents(new); | |
2989 | } | |
2990 | } | |
38c227d8 | 2991 | |
e6dcd2dc CM |
2992 | /* once for us */ |
2993 | btrfs_put_ordered_extent(ordered_extent); | |
2994 | /* once for the tree */ | |
2995 | btrfs_put_ordered_extent(ordered_extent); | |
2996 | ||
5fd02043 JB |
2997 | return ret; |
2998 | } | |
2999 | ||
3000 | static void finish_ordered_fn(struct btrfs_work *work) | |
3001 | { | |
3002 | struct btrfs_ordered_extent *ordered_extent; | |
3003 | ordered_extent = container_of(work, struct btrfs_ordered_extent, work); | |
3004 | btrfs_finish_ordered_io(ordered_extent); | |
e6dcd2dc CM |
3005 | } |
3006 | ||
b2950863 | 3007 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
211f90e6 CM |
3008 | struct extent_state *state, int uptodate) |
3009 | { | |
5fd02043 JB |
3010 | struct inode *inode = page->mapping->host; |
3011 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3012 | struct btrfs_ordered_extent *ordered_extent = NULL; | |
9e0af237 LB |
3013 | struct btrfs_workqueue *wq; |
3014 | btrfs_work_func_t func; | |
5fd02043 | 3015 | |
1abe9b8a | 3016 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
3017 | ||
8b62b72b | 3018 | ClearPagePrivate2(page); |
5fd02043 JB |
3019 | if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
3020 | end - start + 1, uptodate)) | |
3021 | return 0; | |
3022 | ||
9e0af237 LB |
3023 | if (btrfs_is_free_space_inode(inode)) { |
3024 | wq = root->fs_info->endio_freespace_worker; | |
3025 | func = btrfs_freespace_write_helper; | |
3026 | } else { | |
3027 | wq = root->fs_info->endio_write_workers; | |
3028 | func = btrfs_endio_write_helper; | |
3029 | } | |
5fd02043 | 3030 | |
9e0af237 LB |
3031 | btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL, |
3032 | NULL); | |
3033 | btrfs_queue_work(wq, &ordered_extent->work); | |
5fd02043 JB |
3034 | |
3035 | return 0; | |
211f90e6 CM |
3036 | } |
3037 | ||
dc380aea MX |
3038 | static int __readpage_endio_check(struct inode *inode, |
3039 | struct btrfs_io_bio *io_bio, | |
3040 | int icsum, struct page *page, | |
3041 | int pgoff, u64 start, size_t len) | |
3042 | { | |
3043 | char *kaddr; | |
3044 | u32 csum_expected; | |
3045 | u32 csum = ~(u32)0; | |
dc380aea MX |
3046 | |
3047 | csum_expected = *(((u32 *)io_bio->csum) + icsum); | |
3048 | ||
3049 | kaddr = kmap_atomic(page); | |
3050 | csum = btrfs_csum_data(kaddr + pgoff, csum, len); | |
3051 | btrfs_csum_final(csum, (char *)&csum); | |
3052 | if (csum != csum_expected) | |
3053 | goto zeroit; | |
3054 | ||
3055 | kunmap_atomic(kaddr); | |
3056 | return 0; | |
3057 | zeroit: | |
94647322 DS |
3058 | btrfs_warn_rl(BTRFS_I(inode)->root->fs_info, |
3059 | "csum failed ino %llu off %llu csum %u expected csum %u", | |
dc380aea MX |
3060 | btrfs_ino(inode), start, csum, csum_expected); |
3061 | memset(kaddr + pgoff, 1, len); | |
3062 | flush_dcache_page(page); | |
3063 | kunmap_atomic(kaddr); | |
3064 | if (csum_expected == 0) | |
3065 | return 0; | |
3066 | return -EIO; | |
3067 | } | |
3068 | ||
d352ac68 CM |
3069 | /* |
3070 | * when reads are done, we need to check csums to verify the data is correct | |
4a54c8c1 JS |
3071 | * if there's a match, we allow the bio to finish. If not, the code in |
3072 | * extent_io.c will try to find good copies for us. | |
d352ac68 | 3073 | */ |
facc8a22 MX |
3074 | static int btrfs_readpage_end_io_hook(struct btrfs_io_bio *io_bio, |
3075 | u64 phy_offset, struct page *page, | |
3076 | u64 start, u64 end, int mirror) | |
07157aac | 3077 | { |
4eee4fa4 | 3078 | size_t offset = start - page_offset(page); |
07157aac | 3079 | struct inode *inode = page->mapping->host; |
d1310b2e | 3080 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
ff79f819 | 3081 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 3082 | |
d20f7043 CM |
3083 | if (PageChecked(page)) { |
3084 | ClearPageChecked(page); | |
dc380aea | 3085 | return 0; |
d20f7043 | 3086 | } |
6cbff00f CH |
3087 | |
3088 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) | |
dc380aea | 3089 | return 0; |
17d217fe YZ |
3090 | |
3091 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && | |
9655d298 | 3092 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
17d217fe YZ |
3093 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
3094 | GFP_NOFS); | |
b6cda9bc | 3095 | return 0; |
17d217fe | 3096 | } |
d20f7043 | 3097 | |
facc8a22 | 3098 | phy_offset >>= inode->i_sb->s_blocksize_bits; |
dc380aea MX |
3099 | return __readpage_endio_check(inode, io_bio, phy_offset, page, offset, |
3100 | start, (size_t)(end - start + 1)); | |
07157aac | 3101 | } |
b888db2b | 3102 | |
24bbcf04 YZ |
3103 | struct delayed_iput { |
3104 | struct list_head list; | |
3105 | struct inode *inode; | |
3106 | }; | |
3107 | ||
79787eaa JM |
3108 | /* JDM: If this is fs-wide, why can't we add a pointer to |
3109 | * btrfs_inode instead and avoid the allocation? */ | |
24bbcf04 YZ |
3110 | void btrfs_add_delayed_iput(struct inode *inode) |
3111 | { | |
3112 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
3113 | struct delayed_iput *delayed; | |
3114 | ||
3115 | if (atomic_add_unless(&inode->i_count, -1, 1)) | |
3116 | return; | |
3117 | ||
3118 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); | |
3119 | delayed->inode = inode; | |
3120 | ||
3121 | spin_lock(&fs_info->delayed_iput_lock); | |
3122 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); | |
3123 | spin_unlock(&fs_info->delayed_iput_lock); | |
3124 | } | |
3125 | ||
3126 | void btrfs_run_delayed_iputs(struct btrfs_root *root) | |
3127 | { | |
3128 | LIST_HEAD(list); | |
3129 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3130 | struct delayed_iput *delayed; | |
3131 | int empty; | |
3132 | ||
3133 | spin_lock(&fs_info->delayed_iput_lock); | |
3134 | empty = list_empty(&fs_info->delayed_iputs); | |
3135 | spin_unlock(&fs_info->delayed_iput_lock); | |
3136 | if (empty) | |
3137 | return; | |
3138 | ||
d7c15171 ZL |
3139 | down_read(&fs_info->delayed_iput_sem); |
3140 | ||
24bbcf04 YZ |
3141 | spin_lock(&fs_info->delayed_iput_lock); |
3142 | list_splice_init(&fs_info->delayed_iputs, &list); | |
3143 | spin_unlock(&fs_info->delayed_iput_lock); | |
3144 | ||
3145 | while (!list_empty(&list)) { | |
3146 | delayed = list_entry(list.next, struct delayed_iput, list); | |
3147 | list_del(&delayed->list); | |
3148 | iput(delayed->inode); | |
3149 | kfree(delayed); | |
3150 | } | |
d7c15171 ZL |
3151 | |
3152 | up_read(&root->fs_info->delayed_iput_sem); | |
24bbcf04 YZ |
3153 | } |
3154 | ||
d68fc57b | 3155 | /* |
42b2aa86 | 3156 | * This is called in transaction commit time. If there are no orphan |
d68fc57b YZ |
3157 | * files in the subvolume, it removes orphan item and frees block_rsv |
3158 | * structure. | |
3159 | */ | |
3160 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
3161 | struct btrfs_root *root) | |
3162 | { | |
90290e19 | 3163 | struct btrfs_block_rsv *block_rsv; |
d68fc57b YZ |
3164 | int ret; |
3165 | ||
8a35d95f | 3166 | if (atomic_read(&root->orphan_inodes) || |
d68fc57b YZ |
3167 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
3168 | return; | |
3169 | ||
90290e19 | 3170 | spin_lock(&root->orphan_lock); |
8a35d95f | 3171 | if (atomic_read(&root->orphan_inodes)) { |
90290e19 JB |
3172 | spin_unlock(&root->orphan_lock); |
3173 | return; | |
3174 | } | |
3175 | ||
3176 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { | |
3177 | spin_unlock(&root->orphan_lock); | |
3178 | return; | |
3179 | } | |
3180 | ||
3181 | block_rsv = root->orphan_block_rsv; | |
3182 | root->orphan_block_rsv = NULL; | |
3183 | spin_unlock(&root->orphan_lock); | |
3184 | ||
27cdeb70 | 3185 | if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state) && |
d68fc57b YZ |
3186 | btrfs_root_refs(&root->root_item) > 0) { |
3187 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
3188 | root->root_key.objectid); | |
4ef31a45 JB |
3189 | if (ret) |
3190 | btrfs_abort_transaction(trans, root, ret); | |
3191 | else | |
27cdeb70 MX |
3192 | clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, |
3193 | &root->state); | |
d68fc57b YZ |
3194 | } |
3195 | ||
90290e19 JB |
3196 | if (block_rsv) { |
3197 | WARN_ON(block_rsv->size > 0); | |
3198 | btrfs_free_block_rsv(root, block_rsv); | |
d68fc57b YZ |
3199 | } |
3200 | } | |
3201 | ||
7b128766 JB |
3202 | /* |
3203 | * This creates an orphan entry for the given inode in case something goes | |
3204 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
3205 | * |
3206 | * NOTE: caller of this function should reserve 5 units of metadata for | |
3207 | * this function. | |
7b128766 JB |
3208 | */ |
3209 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
3210 | { | |
3211 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3212 | struct btrfs_block_rsv *block_rsv = NULL; |
3213 | int reserve = 0; | |
3214 | int insert = 0; | |
3215 | int ret; | |
7b128766 | 3216 | |
d68fc57b | 3217 | if (!root->orphan_block_rsv) { |
66d8f3dd | 3218 | block_rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
b532402e TI |
3219 | if (!block_rsv) |
3220 | return -ENOMEM; | |
d68fc57b | 3221 | } |
7b128766 | 3222 | |
d68fc57b YZ |
3223 | spin_lock(&root->orphan_lock); |
3224 | if (!root->orphan_block_rsv) { | |
3225 | root->orphan_block_rsv = block_rsv; | |
3226 | } else if (block_rsv) { | |
3227 | btrfs_free_block_rsv(root, block_rsv); | |
3228 | block_rsv = NULL; | |
7b128766 | 3229 | } |
7b128766 | 3230 | |
8a35d95f JB |
3231 | if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3232 | &BTRFS_I(inode)->runtime_flags)) { | |
d68fc57b YZ |
3233 | #if 0 |
3234 | /* | |
3235 | * For proper ENOSPC handling, we should do orphan | |
3236 | * cleanup when mounting. But this introduces backward | |
3237 | * compatibility issue. | |
3238 | */ | |
3239 | if (!xchg(&root->orphan_item_inserted, 1)) | |
3240 | insert = 2; | |
3241 | else | |
3242 | insert = 1; | |
3243 | #endif | |
3244 | insert = 1; | |
321f0e70 | 3245 | atomic_inc(&root->orphan_inodes); |
7b128766 JB |
3246 | } |
3247 | ||
72ac3c0d JB |
3248 | if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3249 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3250 | reserve = 1; |
d68fc57b | 3251 | spin_unlock(&root->orphan_lock); |
7b128766 | 3252 | |
d68fc57b YZ |
3253 | /* grab metadata reservation from transaction handle */ |
3254 | if (reserve) { | |
3255 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
79787eaa | 3256 | BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */ |
d68fc57b | 3257 | } |
7b128766 | 3258 | |
d68fc57b YZ |
3259 | /* insert an orphan item to track this unlinked/truncated file */ |
3260 | if (insert >= 1) { | |
33345d01 | 3261 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
4ef31a45 | 3262 | if (ret) { |
703c88e0 | 3263 | atomic_dec(&root->orphan_inodes); |
4ef31a45 JB |
3264 | if (reserve) { |
3265 | clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, | |
3266 | &BTRFS_I(inode)->runtime_flags); | |
3267 | btrfs_orphan_release_metadata(inode); | |
3268 | } | |
3269 | if (ret != -EEXIST) { | |
e8e7cff6 JB |
3270 | clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3271 | &BTRFS_I(inode)->runtime_flags); | |
4ef31a45 JB |
3272 | btrfs_abort_transaction(trans, root, ret); |
3273 | return ret; | |
3274 | } | |
79787eaa JM |
3275 | } |
3276 | ret = 0; | |
d68fc57b YZ |
3277 | } |
3278 | ||
3279 | /* insert an orphan item to track subvolume contains orphan files */ | |
3280 | if (insert >= 2) { | |
3281 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
3282 | root->root_key.objectid); | |
79787eaa JM |
3283 | if (ret && ret != -EEXIST) { |
3284 | btrfs_abort_transaction(trans, root, ret); | |
3285 | return ret; | |
3286 | } | |
d68fc57b YZ |
3287 | } |
3288 | return 0; | |
7b128766 JB |
3289 | } |
3290 | ||
3291 | /* | |
3292 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
3293 | * item for this particular inode. | |
3294 | */ | |
48a3b636 ES |
3295 | static int btrfs_orphan_del(struct btrfs_trans_handle *trans, |
3296 | struct inode *inode) | |
7b128766 JB |
3297 | { |
3298 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
3299 | int delete_item = 0; |
3300 | int release_rsv = 0; | |
7b128766 JB |
3301 | int ret = 0; |
3302 | ||
d68fc57b | 3303 | spin_lock(&root->orphan_lock); |
8a35d95f JB |
3304 | if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3305 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3306 | delete_item = 1; |
7b128766 | 3307 | |
72ac3c0d JB |
3308 | if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
3309 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 3310 | release_rsv = 1; |
d68fc57b | 3311 | spin_unlock(&root->orphan_lock); |
7b128766 | 3312 | |
703c88e0 | 3313 | if (delete_item) { |
8a35d95f | 3314 | atomic_dec(&root->orphan_inodes); |
703c88e0 FDBM |
3315 | if (trans) |
3316 | ret = btrfs_del_orphan_item(trans, root, | |
3317 | btrfs_ino(inode)); | |
8a35d95f | 3318 | } |
7b128766 | 3319 | |
703c88e0 FDBM |
3320 | if (release_rsv) |
3321 | btrfs_orphan_release_metadata(inode); | |
3322 | ||
4ef31a45 | 3323 | return ret; |
7b128766 JB |
3324 | } |
3325 | ||
3326 | /* | |
3327 | * this cleans up any orphans that may be left on the list from the last use | |
3328 | * of this root. | |
3329 | */ | |
66b4ffd1 | 3330 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
7b128766 JB |
3331 | { |
3332 | struct btrfs_path *path; | |
3333 | struct extent_buffer *leaf; | |
7b128766 JB |
3334 | struct btrfs_key key, found_key; |
3335 | struct btrfs_trans_handle *trans; | |
3336 | struct inode *inode; | |
8f6d7f4f | 3337 | u64 last_objectid = 0; |
7b128766 JB |
3338 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
3339 | ||
d68fc57b | 3340 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
66b4ffd1 | 3341 | return 0; |
c71bf099 YZ |
3342 | |
3343 | path = btrfs_alloc_path(); | |
66b4ffd1 JB |
3344 | if (!path) { |
3345 | ret = -ENOMEM; | |
3346 | goto out; | |
3347 | } | |
7b128766 JB |
3348 | path->reada = -1; |
3349 | ||
3350 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
962a298f | 3351 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
7b128766 JB |
3352 | key.offset = (u64)-1; |
3353 | ||
7b128766 JB |
3354 | while (1) { |
3355 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
66b4ffd1 JB |
3356 | if (ret < 0) |
3357 | goto out; | |
7b128766 JB |
3358 | |
3359 | /* | |
3360 | * if ret == 0 means we found what we were searching for, which | |
25985edc | 3361 | * is weird, but possible, so only screw with path if we didn't |
7b128766 JB |
3362 | * find the key and see if we have stuff that matches |
3363 | */ | |
3364 | if (ret > 0) { | |
66b4ffd1 | 3365 | ret = 0; |
7b128766 JB |
3366 | if (path->slots[0] == 0) |
3367 | break; | |
3368 | path->slots[0]--; | |
3369 | } | |
3370 | ||
3371 | /* pull out the item */ | |
3372 | leaf = path->nodes[0]; | |
7b128766 JB |
3373 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
3374 | ||
3375 | /* make sure the item matches what we want */ | |
3376 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
3377 | break; | |
962a298f | 3378 | if (found_key.type != BTRFS_ORPHAN_ITEM_KEY) |
7b128766 JB |
3379 | break; |
3380 | ||
3381 | /* release the path since we're done with it */ | |
b3b4aa74 | 3382 | btrfs_release_path(path); |
7b128766 JB |
3383 | |
3384 | /* | |
3385 | * this is where we are basically btrfs_lookup, without the | |
3386 | * crossing root thing. we store the inode number in the | |
3387 | * offset of the orphan item. | |
3388 | */ | |
8f6d7f4f JB |
3389 | |
3390 | if (found_key.offset == last_objectid) { | |
c2cf52eb SK |
3391 | btrfs_err(root->fs_info, |
3392 | "Error removing orphan entry, stopping orphan cleanup"); | |
8f6d7f4f JB |
3393 | ret = -EINVAL; |
3394 | goto out; | |
3395 | } | |
3396 | ||
3397 | last_objectid = found_key.offset; | |
3398 | ||
5d4f98a2 YZ |
3399 | found_key.objectid = found_key.offset; |
3400 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
3401 | found_key.offset = 0; | |
73f73415 | 3402 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
8c6ffba0 | 3403 | ret = PTR_ERR_OR_ZERO(inode); |
a8c9e576 | 3404 | if (ret && ret != -ESTALE) |
66b4ffd1 | 3405 | goto out; |
7b128766 | 3406 | |
f8e9e0b0 AJ |
3407 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
3408 | struct btrfs_root *dead_root; | |
3409 | struct btrfs_fs_info *fs_info = root->fs_info; | |
3410 | int is_dead_root = 0; | |
3411 | ||
3412 | /* | |
3413 | * this is an orphan in the tree root. Currently these | |
3414 | * could come from 2 sources: | |
3415 | * a) a snapshot deletion in progress | |
3416 | * b) a free space cache inode | |
3417 | * We need to distinguish those two, as the snapshot | |
3418 | * orphan must not get deleted. | |
3419 | * find_dead_roots already ran before us, so if this | |
3420 | * is a snapshot deletion, we should find the root | |
3421 | * in the dead_roots list | |
3422 | */ | |
3423 | spin_lock(&fs_info->trans_lock); | |
3424 | list_for_each_entry(dead_root, &fs_info->dead_roots, | |
3425 | root_list) { | |
3426 | if (dead_root->root_key.objectid == | |
3427 | found_key.objectid) { | |
3428 | is_dead_root = 1; | |
3429 | break; | |
3430 | } | |
3431 | } | |
3432 | spin_unlock(&fs_info->trans_lock); | |
3433 | if (is_dead_root) { | |
3434 | /* prevent this orphan from being found again */ | |
3435 | key.offset = found_key.objectid - 1; | |
3436 | continue; | |
3437 | } | |
3438 | } | |
7b128766 | 3439 | /* |
a8c9e576 JB |
3440 | * Inode is already gone but the orphan item is still there, |
3441 | * kill the orphan item. | |
7b128766 | 3442 | */ |
a8c9e576 JB |
3443 | if (ret == -ESTALE) { |
3444 | trans = btrfs_start_transaction(root, 1); | |
66b4ffd1 JB |
3445 | if (IS_ERR(trans)) { |
3446 | ret = PTR_ERR(trans); | |
3447 | goto out; | |
3448 | } | |
c2cf52eb SK |
3449 | btrfs_debug(root->fs_info, "auto deleting %Lu", |
3450 | found_key.objectid); | |
a8c9e576 JB |
3451 | ret = btrfs_del_orphan_item(trans, root, |
3452 | found_key.objectid); | |
5b21f2ed | 3453 | btrfs_end_transaction(trans, root); |
4ef31a45 JB |
3454 | if (ret) |
3455 | goto out; | |
7b128766 JB |
3456 | continue; |
3457 | } | |
3458 | ||
a8c9e576 JB |
3459 | /* |
3460 | * add this inode to the orphan list so btrfs_orphan_del does | |
3461 | * the proper thing when we hit it | |
3462 | */ | |
8a35d95f JB |
3463 | set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
3464 | &BTRFS_I(inode)->runtime_flags); | |
925396ec | 3465 | atomic_inc(&root->orphan_inodes); |
a8c9e576 | 3466 | |
7b128766 JB |
3467 | /* if we have links, this was a truncate, lets do that */ |
3468 | if (inode->i_nlink) { | |
fae7f21c | 3469 | if (WARN_ON(!S_ISREG(inode->i_mode))) { |
a41ad394 JB |
3470 | iput(inode); |
3471 | continue; | |
3472 | } | |
7b128766 | 3473 | nr_truncate++; |
f3fe820c JB |
3474 | |
3475 | /* 1 for the orphan item deletion. */ | |
3476 | trans = btrfs_start_transaction(root, 1); | |
3477 | if (IS_ERR(trans)) { | |
c69b26b0 | 3478 | iput(inode); |
f3fe820c JB |
3479 | ret = PTR_ERR(trans); |
3480 | goto out; | |
3481 | } | |
3482 | ret = btrfs_orphan_add(trans, inode); | |
3483 | btrfs_end_transaction(trans, root); | |
c69b26b0 JB |
3484 | if (ret) { |
3485 | iput(inode); | |
f3fe820c | 3486 | goto out; |
c69b26b0 | 3487 | } |
f3fe820c | 3488 | |
66b4ffd1 | 3489 | ret = btrfs_truncate(inode); |
4a7d0f68 JB |
3490 | if (ret) |
3491 | btrfs_orphan_del(NULL, inode); | |
7b128766 JB |
3492 | } else { |
3493 | nr_unlink++; | |
3494 | } | |
3495 | ||
3496 | /* this will do delete_inode and everything for us */ | |
3497 | iput(inode); | |
66b4ffd1 JB |
3498 | if (ret) |
3499 | goto out; | |
7b128766 | 3500 | } |
3254c876 MX |
3501 | /* release the path since we're done with it */ |
3502 | btrfs_release_path(path); | |
3503 | ||
d68fc57b YZ |
3504 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
3505 | ||
3506 | if (root->orphan_block_rsv) | |
3507 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
3508 | (u64)-1); | |
3509 | ||
27cdeb70 MX |
3510 | if (root->orphan_block_rsv || |
3511 | test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state)) { | |
7a7eaa40 | 3512 | trans = btrfs_join_transaction(root); |
66b4ffd1 JB |
3513 | if (!IS_ERR(trans)) |
3514 | btrfs_end_transaction(trans, root); | |
d68fc57b | 3515 | } |
7b128766 JB |
3516 | |
3517 | if (nr_unlink) | |
4884b476 | 3518 | btrfs_debug(root->fs_info, "unlinked %d orphans", nr_unlink); |
7b128766 | 3519 | if (nr_truncate) |
4884b476 | 3520 | btrfs_debug(root->fs_info, "truncated %d orphans", nr_truncate); |
66b4ffd1 JB |
3521 | |
3522 | out: | |
3523 | if (ret) | |
68b663d1 | 3524 | btrfs_err(root->fs_info, |
c2cf52eb | 3525 | "could not do orphan cleanup %d", ret); |
66b4ffd1 JB |
3526 | btrfs_free_path(path); |
3527 | return ret; | |
7b128766 JB |
3528 | } |
3529 | ||
46a53cca CM |
3530 | /* |
3531 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
3532 | * don't find any xattrs, we know there can't be any acls. | |
3533 | * | |
3534 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
3535 | */ | |
3536 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
63541927 FDBM |
3537 | int slot, u64 objectid, |
3538 | int *first_xattr_slot) | |
46a53cca CM |
3539 | { |
3540 | u32 nritems = btrfs_header_nritems(leaf); | |
3541 | struct btrfs_key found_key; | |
f23b5a59 JB |
3542 | static u64 xattr_access = 0; |
3543 | static u64 xattr_default = 0; | |
46a53cca CM |
3544 | int scanned = 0; |
3545 | ||
f23b5a59 JB |
3546 | if (!xattr_access) { |
3547 | xattr_access = btrfs_name_hash(POSIX_ACL_XATTR_ACCESS, | |
3548 | strlen(POSIX_ACL_XATTR_ACCESS)); | |
3549 | xattr_default = btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT, | |
3550 | strlen(POSIX_ACL_XATTR_DEFAULT)); | |
3551 | } | |
3552 | ||
46a53cca | 3553 | slot++; |
63541927 | 3554 | *first_xattr_slot = -1; |
46a53cca CM |
3555 | while (slot < nritems) { |
3556 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
3557 | ||
3558 | /* we found a different objectid, there must not be acls */ | |
3559 | if (found_key.objectid != objectid) | |
3560 | return 0; | |
3561 | ||
3562 | /* we found an xattr, assume we've got an acl */ | |
f23b5a59 | 3563 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) { |
63541927 FDBM |
3564 | if (*first_xattr_slot == -1) |
3565 | *first_xattr_slot = slot; | |
f23b5a59 JB |
3566 | if (found_key.offset == xattr_access || |
3567 | found_key.offset == xattr_default) | |
3568 | return 1; | |
3569 | } | |
46a53cca CM |
3570 | |
3571 | /* | |
3572 | * we found a key greater than an xattr key, there can't | |
3573 | * be any acls later on | |
3574 | */ | |
3575 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
3576 | return 0; | |
3577 | ||
3578 | slot++; | |
3579 | scanned++; | |
3580 | ||
3581 | /* | |
3582 | * it goes inode, inode backrefs, xattrs, extents, | |
3583 | * so if there are a ton of hard links to an inode there can | |
3584 | * be a lot of backrefs. Don't waste time searching too hard, | |
3585 | * this is just an optimization | |
3586 | */ | |
3587 | if (scanned >= 8) | |
3588 | break; | |
3589 | } | |
3590 | /* we hit the end of the leaf before we found an xattr or | |
3591 | * something larger than an xattr. We have to assume the inode | |
3592 | * has acls | |
3593 | */ | |
63541927 FDBM |
3594 | if (*first_xattr_slot == -1) |
3595 | *first_xattr_slot = slot; | |
46a53cca CM |
3596 | return 1; |
3597 | } | |
3598 | ||
d352ac68 CM |
3599 | /* |
3600 | * read an inode from the btree into the in-memory inode | |
3601 | */ | |
5d4f98a2 | 3602 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
3603 | { |
3604 | struct btrfs_path *path; | |
5f39d397 | 3605 | struct extent_buffer *leaf; |
39279cc3 CM |
3606 | struct btrfs_inode_item *inode_item; |
3607 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3608 | struct btrfs_key location; | |
67de1176 | 3609 | unsigned long ptr; |
46a53cca | 3610 | int maybe_acls; |
618e21d5 | 3611 | u32 rdev; |
39279cc3 | 3612 | int ret; |
2f7e33d4 | 3613 | bool filled = false; |
63541927 | 3614 | int first_xattr_slot; |
2f7e33d4 MX |
3615 | |
3616 | ret = btrfs_fill_inode(inode, &rdev); | |
3617 | if (!ret) | |
3618 | filled = true; | |
39279cc3 CM |
3619 | |
3620 | path = btrfs_alloc_path(); | |
1748f843 MF |
3621 | if (!path) |
3622 | goto make_bad; | |
3623 | ||
39279cc3 | 3624 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 3625 | |
39279cc3 | 3626 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 3627 | if (ret) |
39279cc3 | 3628 | goto make_bad; |
39279cc3 | 3629 | |
5f39d397 | 3630 | leaf = path->nodes[0]; |
2f7e33d4 MX |
3631 | |
3632 | if (filled) | |
67de1176 | 3633 | goto cache_index; |
2f7e33d4 | 3634 | |
5f39d397 CM |
3635 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
3636 | struct btrfs_inode_item); | |
5f39d397 | 3637 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
bfe86848 | 3638 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
2f2f43d3 EB |
3639 | i_uid_write(inode, btrfs_inode_uid(leaf, inode_item)); |
3640 | i_gid_write(inode, btrfs_inode_gid(leaf, inode_item)); | |
dbe674a9 | 3641 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 | 3642 | |
a937b979 DS |
3643 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->atime); |
3644 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->atime); | |
5f39d397 | 3645 | |
a937b979 DS |
3646 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->mtime); |
3647 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->mtime); | |
5f39d397 | 3648 | |
a937b979 DS |
3649 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, &inode_item->ctime); |
3650 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, &inode_item->ctime); | |
5f39d397 | 3651 | |
9cc97d64 | 3652 | BTRFS_I(inode)->i_otime.tv_sec = |
3653 | btrfs_timespec_sec(leaf, &inode_item->otime); | |
3654 | BTRFS_I(inode)->i_otime.tv_nsec = | |
3655 | btrfs_timespec_nsec(leaf, &inode_item->otime); | |
5f39d397 | 3656 | |
a76a3cd4 | 3657 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 3658 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
5dc562c5 JB |
3659 | BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item); |
3660 | ||
6e17d30b YD |
3661 | inode->i_version = btrfs_inode_sequence(leaf, inode_item); |
3662 | inode->i_generation = BTRFS_I(inode)->generation; | |
3663 | inode->i_rdev = 0; | |
3664 | rdev = btrfs_inode_rdev(leaf, inode_item); | |
3665 | ||
3666 | BTRFS_I(inode)->index_cnt = (u64)-1; | |
3667 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); | |
3668 | ||
3669 | cache_index: | |
5dc562c5 JB |
3670 | /* |
3671 | * If we were modified in the current generation and evicted from memory | |
3672 | * and then re-read we need to do a full sync since we don't have any | |
3673 | * idea about which extents were modified before we were evicted from | |
3674 | * cache. | |
6e17d30b YD |
3675 | * |
3676 | * This is required for both inode re-read from disk and delayed inode | |
3677 | * in delayed_nodes_tree. | |
5dc562c5 JB |
3678 | */ |
3679 | if (BTRFS_I(inode)->last_trans == root->fs_info->generation) | |
3680 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3681 | &BTRFS_I(inode)->runtime_flags); | |
3682 | ||
bde6c242 FM |
3683 | /* |
3684 | * We don't persist the id of the transaction where an unlink operation | |
3685 | * against the inode was last made. So here we assume the inode might | |
3686 | * have been evicted, and therefore the exact value of last_unlink_trans | |
3687 | * lost, and set it to last_trans to avoid metadata inconsistencies | |
3688 | * between the inode and its parent if the inode is fsync'ed and the log | |
3689 | * replayed. For example, in the scenario: | |
3690 | * | |
3691 | * touch mydir/foo | |
3692 | * ln mydir/foo mydir/bar | |
3693 | * sync | |
3694 | * unlink mydir/bar | |
3695 | * echo 2 > /proc/sys/vm/drop_caches # evicts inode | |
3696 | * xfs_io -c fsync mydir/foo | |
3697 | * <power failure> | |
3698 | * mount fs, triggers fsync log replay | |
3699 | * | |
3700 | * We must make sure that when we fsync our inode foo we also log its | |
3701 | * parent inode, otherwise after log replay the parent still has the | |
3702 | * dentry with the "bar" name but our inode foo has a link count of 1 | |
3703 | * and doesn't have an inode ref with the name "bar" anymore. | |
3704 | * | |
3705 | * Setting last_unlink_trans to last_trans is a pessimistic approach, | |
3706 | * but it guarantees correctness at the expense of ocassional full | |
3707 | * transaction commits on fsync if our inode is a directory, or if our | |
3708 | * inode is not a directory, logging its parent unnecessarily. | |
3709 | */ | |
3710 | BTRFS_I(inode)->last_unlink_trans = BTRFS_I(inode)->last_trans; | |
3711 | ||
67de1176 MX |
3712 | path->slots[0]++; |
3713 | if (inode->i_nlink != 1 || | |
3714 | path->slots[0] >= btrfs_header_nritems(leaf)) | |
3715 | goto cache_acl; | |
3716 | ||
3717 | btrfs_item_key_to_cpu(leaf, &location, path->slots[0]); | |
3718 | if (location.objectid != btrfs_ino(inode)) | |
3719 | goto cache_acl; | |
3720 | ||
3721 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
3722 | if (location.type == BTRFS_INODE_REF_KEY) { | |
3723 | struct btrfs_inode_ref *ref; | |
3724 | ||
3725 | ref = (struct btrfs_inode_ref *)ptr; | |
3726 | BTRFS_I(inode)->dir_index = btrfs_inode_ref_index(leaf, ref); | |
3727 | } else if (location.type == BTRFS_INODE_EXTREF_KEY) { | |
3728 | struct btrfs_inode_extref *extref; | |
3729 | ||
3730 | extref = (struct btrfs_inode_extref *)ptr; | |
3731 | BTRFS_I(inode)->dir_index = btrfs_inode_extref_index(leaf, | |
3732 | extref); | |
3733 | } | |
2f7e33d4 | 3734 | cache_acl: |
46a53cca CM |
3735 | /* |
3736 | * try to precache a NULL acl entry for files that don't have | |
3737 | * any xattrs or acls | |
3738 | */ | |
33345d01 | 3739 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
63541927 FDBM |
3740 | btrfs_ino(inode), &first_xattr_slot); |
3741 | if (first_xattr_slot != -1) { | |
3742 | path->slots[0] = first_xattr_slot; | |
3743 | ret = btrfs_load_inode_props(inode, path); | |
3744 | if (ret) | |
3745 | btrfs_err(root->fs_info, | |
351fd353 | 3746 | "error loading props for ino %llu (root %llu): %d", |
63541927 FDBM |
3747 | btrfs_ino(inode), |
3748 | root->root_key.objectid, ret); | |
3749 | } | |
3750 | btrfs_free_path(path); | |
3751 | ||
72c04902 AV |
3752 | if (!maybe_acls) |
3753 | cache_no_acl(inode); | |
46a53cca | 3754 | |
39279cc3 | 3755 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
3756 | case S_IFREG: |
3757 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 3758 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3759 | inode->i_fop = &btrfs_file_operations; |
3760 | inode->i_op = &btrfs_file_inode_operations; | |
3761 | break; | |
3762 | case S_IFDIR: | |
3763 | inode->i_fop = &btrfs_dir_file_operations; | |
3764 | if (root == root->fs_info->tree_root) | |
3765 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
3766 | else | |
3767 | inode->i_op = &btrfs_dir_inode_operations; | |
3768 | break; | |
3769 | case S_IFLNK: | |
3770 | inode->i_op = &btrfs_symlink_inode_operations; | |
3771 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
3772 | break; | |
618e21d5 | 3773 | default: |
0279b4cd | 3774 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
3775 | init_special_inode(inode, inode->i_mode, rdev); |
3776 | break; | |
39279cc3 | 3777 | } |
6cbff00f CH |
3778 | |
3779 | btrfs_update_iflags(inode); | |
39279cc3 CM |
3780 | return; |
3781 | ||
3782 | make_bad: | |
39279cc3 | 3783 | btrfs_free_path(path); |
39279cc3 CM |
3784 | make_bad_inode(inode); |
3785 | } | |
3786 | ||
d352ac68 CM |
3787 | /* |
3788 | * given a leaf and an inode, copy the inode fields into the leaf | |
3789 | */ | |
e02119d5 CM |
3790 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
3791 | struct extent_buffer *leaf, | |
5f39d397 | 3792 | struct btrfs_inode_item *item, |
39279cc3 CM |
3793 | struct inode *inode) |
3794 | { | |
51fab693 LB |
3795 | struct btrfs_map_token token; |
3796 | ||
3797 | btrfs_init_map_token(&token); | |
5f39d397 | 3798 | |
51fab693 LB |
3799 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); |
3800 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); | |
3801 | btrfs_set_token_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size, | |
3802 | &token); | |
3803 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); | |
3804 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); | |
5f39d397 | 3805 | |
a937b979 | 3806 | btrfs_set_token_timespec_sec(leaf, &item->atime, |
51fab693 | 3807 | inode->i_atime.tv_sec, &token); |
a937b979 | 3808 | btrfs_set_token_timespec_nsec(leaf, &item->atime, |
51fab693 | 3809 | inode->i_atime.tv_nsec, &token); |
5f39d397 | 3810 | |
a937b979 | 3811 | btrfs_set_token_timespec_sec(leaf, &item->mtime, |
51fab693 | 3812 | inode->i_mtime.tv_sec, &token); |
a937b979 | 3813 | btrfs_set_token_timespec_nsec(leaf, &item->mtime, |
51fab693 | 3814 | inode->i_mtime.tv_nsec, &token); |
5f39d397 | 3815 | |
a937b979 | 3816 | btrfs_set_token_timespec_sec(leaf, &item->ctime, |
51fab693 | 3817 | inode->i_ctime.tv_sec, &token); |
a937b979 | 3818 | btrfs_set_token_timespec_nsec(leaf, &item->ctime, |
51fab693 | 3819 | inode->i_ctime.tv_nsec, &token); |
5f39d397 | 3820 | |
9cc97d64 | 3821 | btrfs_set_token_timespec_sec(leaf, &item->otime, |
3822 | BTRFS_I(inode)->i_otime.tv_sec, &token); | |
3823 | btrfs_set_token_timespec_nsec(leaf, &item->otime, | |
3824 | BTRFS_I(inode)->i_otime.tv_nsec, &token); | |
3825 | ||
51fab693 LB |
3826 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), |
3827 | &token); | |
3828 | btrfs_set_token_inode_generation(leaf, item, BTRFS_I(inode)->generation, | |
3829 | &token); | |
3830 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); | |
3831 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); | |
3832 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); | |
3833 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); | |
3834 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); | |
39279cc3 CM |
3835 | } |
3836 | ||
d352ac68 CM |
3837 | /* |
3838 | * copy everything in the in-memory inode into the btree. | |
3839 | */ | |
2115133f | 3840 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
d397712b | 3841 | struct btrfs_root *root, struct inode *inode) |
39279cc3 CM |
3842 | { |
3843 | struct btrfs_inode_item *inode_item; | |
3844 | struct btrfs_path *path; | |
5f39d397 | 3845 | struct extent_buffer *leaf; |
39279cc3 CM |
3846 | int ret; |
3847 | ||
3848 | path = btrfs_alloc_path(); | |
16cdcec7 MX |
3849 | if (!path) |
3850 | return -ENOMEM; | |
3851 | ||
b9473439 | 3852 | path->leave_spinning = 1; |
16cdcec7 MX |
3853 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
3854 | 1); | |
39279cc3 CM |
3855 | if (ret) { |
3856 | if (ret > 0) | |
3857 | ret = -ENOENT; | |
3858 | goto failed; | |
3859 | } | |
3860 | ||
5f39d397 CM |
3861 | leaf = path->nodes[0]; |
3862 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
16cdcec7 | 3863 | struct btrfs_inode_item); |
39279cc3 | 3864 | |
e02119d5 | 3865 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 3866 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 3867 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
3868 | ret = 0; |
3869 | failed: | |
39279cc3 CM |
3870 | btrfs_free_path(path); |
3871 | return ret; | |
3872 | } | |
3873 | ||
2115133f CM |
3874 | /* |
3875 | * copy everything in the in-memory inode into the btree. | |
3876 | */ | |
3877 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
3878 | struct btrfs_root *root, struct inode *inode) | |
3879 | { | |
3880 | int ret; | |
3881 | ||
3882 | /* | |
3883 | * If the inode is a free space inode, we can deadlock during commit | |
3884 | * if we put it into the delayed code. | |
3885 | * | |
3886 | * The data relocation inode should also be directly updated | |
3887 | * without delay | |
3888 | */ | |
83eea1f1 | 3889 | if (!btrfs_is_free_space_inode(inode) |
1d52c78a JB |
3890 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
3891 | && !root->fs_info->log_root_recovering) { | |
8ea05e3a AB |
3892 | btrfs_update_root_times(trans, root); |
3893 | ||
2115133f CM |
3894 | ret = btrfs_delayed_update_inode(trans, root, inode); |
3895 | if (!ret) | |
3896 | btrfs_set_inode_last_trans(trans, inode); | |
3897 | return ret; | |
3898 | } | |
3899 | ||
3900 | return btrfs_update_inode_item(trans, root, inode); | |
3901 | } | |
3902 | ||
be6aef60 JB |
3903 | noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
3904 | struct btrfs_root *root, | |
3905 | struct inode *inode) | |
2115133f CM |
3906 | { |
3907 | int ret; | |
3908 | ||
3909 | ret = btrfs_update_inode(trans, root, inode); | |
3910 | if (ret == -ENOSPC) | |
3911 | return btrfs_update_inode_item(trans, root, inode); | |
3912 | return ret; | |
3913 | } | |
3914 | ||
d352ac68 CM |
3915 | /* |
3916 | * unlink helper that gets used here in inode.c and in the tree logging | |
3917 | * recovery code. It remove a link in a directory with a given name, and | |
3918 | * also drops the back refs in the inode to the directory | |
3919 | */ | |
92986796 AV |
3920 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
3921 | struct btrfs_root *root, | |
3922 | struct inode *dir, struct inode *inode, | |
3923 | const char *name, int name_len) | |
39279cc3 CM |
3924 | { |
3925 | struct btrfs_path *path; | |
39279cc3 | 3926 | int ret = 0; |
5f39d397 | 3927 | struct extent_buffer *leaf; |
39279cc3 | 3928 | struct btrfs_dir_item *di; |
5f39d397 | 3929 | struct btrfs_key key; |
aec7477b | 3930 | u64 index; |
33345d01 LZ |
3931 | u64 ino = btrfs_ino(inode); |
3932 | u64 dir_ino = btrfs_ino(dir); | |
39279cc3 CM |
3933 | |
3934 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
3935 | if (!path) { |
3936 | ret = -ENOMEM; | |
554233a6 | 3937 | goto out; |
54aa1f4d CM |
3938 | } |
3939 | ||
b9473439 | 3940 | path->leave_spinning = 1; |
33345d01 | 3941 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
39279cc3 CM |
3942 | name, name_len, -1); |
3943 | if (IS_ERR(di)) { | |
3944 | ret = PTR_ERR(di); | |
3945 | goto err; | |
3946 | } | |
3947 | if (!di) { | |
3948 | ret = -ENOENT; | |
3949 | goto err; | |
3950 | } | |
5f39d397 CM |
3951 | leaf = path->nodes[0]; |
3952 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 3953 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
3954 | if (ret) |
3955 | goto err; | |
b3b4aa74 | 3956 | btrfs_release_path(path); |
39279cc3 | 3957 | |
67de1176 MX |
3958 | /* |
3959 | * If we don't have dir index, we have to get it by looking up | |
3960 | * the inode ref, since we get the inode ref, remove it directly, | |
3961 | * it is unnecessary to do delayed deletion. | |
3962 | * | |
3963 | * But if we have dir index, needn't search inode ref to get it. | |
3964 | * Since the inode ref is close to the inode item, it is better | |
3965 | * that we delay to delete it, and just do this deletion when | |
3966 | * we update the inode item. | |
3967 | */ | |
3968 | if (BTRFS_I(inode)->dir_index) { | |
3969 | ret = btrfs_delayed_delete_inode_ref(inode); | |
3970 | if (!ret) { | |
3971 | index = BTRFS_I(inode)->dir_index; | |
3972 | goto skip_backref; | |
3973 | } | |
3974 | } | |
3975 | ||
33345d01 LZ |
3976 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
3977 | dir_ino, &index); | |
aec7477b | 3978 | if (ret) { |
c2cf52eb SK |
3979 | btrfs_info(root->fs_info, |
3980 | "failed to delete reference to %.*s, inode %llu parent %llu", | |
c1c9ff7c | 3981 | name_len, name, ino, dir_ino); |
79787eaa | 3982 | btrfs_abort_transaction(trans, root, ret); |
aec7477b JB |
3983 | goto err; |
3984 | } | |
67de1176 | 3985 | skip_backref: |
16cdcec7 | 3986 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
3987 | if (ret) { |
3988 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 3989 | goto err; |
79787eaa | 3990 | } |
39279cc3 | 3991 | |
e02119d5 | 3992 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
33345d01 | 3993 | inode, dir_ino); |
79787eaa JM |
3994 | if (ret != 0 && ret != -ENOENT) { |
3995 | btrfs_abort_transaction(trans, root, ret); | |
3996 | goto err; | |
3997 | } | |
e02119d5 CM |
3998 | |
3999 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
4000 | dir, index); | |
6418c961 CM |
4001 | if (ret == -ENOENT) |
4002 | ret = 0; | |
d4e3991b ZB |
4003 | else if (ret) |
4004 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 CM |
4005 | err: |
4006 | btrfs_free_path(path); | |
e02119d5 CM |
4007 | if (ret) |
4008 | goto out; | |
4009 | ||
4010 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 JB |
4011 | inode_inc_iversion(inode); |
4012 | inode_inc_iversion(dir); | |
e02119d5 | 4013 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
b9959295 | 4014 | ret = btrfs_update_inode(trans, root, dir); |
e02119d5 | 4015 | out: |
39279cc3 CM |
4016 | return ret; |
4017 | } | |
4018 | ||
92986796 AV |
4019 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
4020 | struct btrfs_root *root, | |
4021 | struct inode *dir, struct inode *inode, | |
4022 | const char *name, int name_len) | |
4023 | { | |
4024 | int ret; | |
4025 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); | |
4026 | if (!ret) { | |
8b558c5f | 4027 | drop_nlink(inode); |
92986796 AV |
4028 | ret = btrfs_update_inode(trans, root, inode); |
4029 | } | |
4030 | return ret; | |
4031 | } | |
39279cc3 | 4032 | |
a22285a6 YZ |
4033 | /* |
4034 | * helper to start transaction for unlink and rmdir. | |
4035 | * | |
d52be818 JB |
4036 | * unlink and rmdir are special in btrfs, they do not always free space, so |
4037 | * if we cannot make our reservations the normal way try and see if there is | |
4038 | * plenty of slack room in the global reserve to migrate, otherwise we cannot | |
4039 | * allow the unlink to occur. | |
a22285a6 | 4040 | */ |
d52be818 | 4041 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir) |
4df27c4d | 4042 | { |
39279cc3 | 4043 | struct btrfs_trans_handle *trans; |
a22285a6 | 4044 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d YZ |
4045 | int ret; |
4046 | ||
e70bea5f JB |
4047 | /* |
4048 | * 1 for the possible orphan item | |
4049 | * 1 for the dir item | |
4050 | * 1 for the dir index | |
4051 | * 1 for the inode ref | |
e70bea5f JB |
4052 | * 1 for the inode |
4053 | */ | |
6e137ed3 | 4054 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
4055 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
4056 | return trans; | |
4df27c4d | 4057 | |
d52be818 JB |
4058 | if (PTR_ERR(trans) == -ENOSPC) { |
4059 | u64 num_bytes = btrfs_calc_trans_metadata_size(root, 5); | |
4df27c4d | 4060 | |
d52be818 JB |
4061 | trans = btrfs_start_transaction(root, 0); |
4062 | if (IS_ERR(trans)) | |
4063 | return trans; | |
4064 | ret = btrfs_cond_migrate_bytes(root->fs_info, | |
4065 | &root->fs_info->trans_block_rsv, | |
4066 | num_bytes, 5); | |
4067 | if (ret) { | |
4068 | btrfs_end_transaction(trans, root); | |
4069 | return ERR_PTR(ret); | |
a22285a6 | 4070 | } |
5a77d76c | 4071 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
d52be818 | 4072 | trans->bytes_reserved = num_bytes; |
a22285a6 | 4073 | } |
d52be818 | 4074 | return trans; |
a22285a6 YZ |
4075 | } |
4076 | ||
4077 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
4078 | { | |
4079 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
4080 | struct btrfs_trans_handle *trans; | |
2b0143b5 | 4081 | struct inode *inode = d_inode(dentry); |
a22285a6 | 4082 | int ret; |
a22285a6 | 4083 | |
d52be818 | 4084 | trans = __unlink_start_trans(dir); |
a22285a6 YZ |
4085 | if (IS_ERR(trans)) |
4086 | return PTR_ERR(trans); | |
5f39d397 | 4087 | |
2b0143b5 | 4088 | btrfs_record_unlink_dir(trans, dir, d_inode(dentry), 0); |
12fcfd22 | 4089 | |
2b0143b5 | 4090 | ret = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4091 | dentry->d_name.name, dentry->d_name.len); |
b532402e TI |
4092 | if (ret) |
4093 | goto out; | |
7b128766 | 4094 | |
a22285a6 | 4095 | if (inode->i_nlink == 0) { |
7b128766 | 4096 | ret = btrfs_orphan_add(trans, inode); |
b532402e TI |
4097 | if (ret) |
4098 | goto out; | |
a22285a6 | 4099 | } |
7b128766 | 4100 | |
b532402e | 4101 | out: |
d52be818 | 4102 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4103 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
4104 | return ret; |
4105 | } | |
4106 | ||
4df27c4d YZ |
4107 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
4108 | struct btrfs_root *root, | |
4109 | struct inode *dir, u64 objectid, | |
4110 | const char *name, int name_len) | |
4111 | { | |
4112 | struct btrfs_path *path; | |
4113 | struct extent_buffer *leaf; | |
4114 | struct btrfs_dir_item *di; | |
4115 | struct btrfs_key key; | |
4116 | u64 index; | |
4117 | int ret; | |
33345d01 | 4118 | u64 dir_ino = btrfs_ino(dir); |
4df27c4d YZ |
4119 | |
4120 | path = btrfs_alloc_path(); | |
4121 | if (!path) | |
4122 | return -ENOMEM; | |
4123 | ||
33345d01 | 4124 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
4df27c4d | 4125 | name, name_len, -1); |
79787eaa JM |
4126 | if (IS_ERR_OR_NULL(di)) { |
4127 | if (!di) | |
4128 | ret = -ENOENT; | |
4129 | else | |
4130 | ret = PTR_ERR(di); | |
4131 | goto out; | |
4132 | } | |
4df27c4d YZ |
4133 | |
4134 | leaf = path->nodes[0]; | |
4135 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
4136 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
4137 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
79787eaa JM |
4138 | if (ret) { |
4139 | btrfs_abort_transaction(trans, root, ret); | |
4140 | goto out; | |
4141 | } | |
b3b4aa74 | 4142 | btrfs_release_path(path); |
4df27c4d YZ |
4143 | |
4144 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
4145 | objectid, root->root_key.objectid, | |
33345d01 | 4146 | dir_ino, &index, name, name_len); |
4df27c4d | 4147 | if (ret < 0) { |
79787eaa JM |
4148 | if (ret != -ENOENT) { |
4149 | btrfs_abort_transaction(trans, root, ret); | |
4150 | goto out; | |
4151 | } | |
33345d01 | 4152 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
4df27c4d | 4153 | name, name_len); |
79787eaa JM |
4154 | if (IS_ERR_OR_NULL(di)) { |
4155 | if (!di) | |
4156 | ret = -ENOENT; | |
4157 | else | |
4158 | ret = PTR_ERR(di); | |
4159 | btrfs_abort_transaction(trans, root, ret); | |
4160 | goto out; | |
4161 | } | |
4df27c4d YZ |
4162 | |
4163 | leaf = path->nodes[0]; | |
4164 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 4165 | btrfs_release_path(path); |
4df27c4d YZ |
4166 | index = key.offset; |
4167 | } | |
945d8962 | 4168 | btrfs_release_path(path); |
4df27c4d | 4169 | |
16cdcec7 | 4170 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
4171 | if (ret) { |
4172 | btrfs_abort_transaction(trans, root, ret); | |
4173 | goto out; | |
4174 | } | |
4df27c4d YZ |
4175 | |
4176 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 | 4177 | inode_inc_iversion(dir); |
4df27c4d | 4178 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
5a24e84c | 4179 | ret = btrfs_update_inode_fallback(trans, root, dir); |
79787eaa JM |
4180 | if (ret) |
4181 | btrfs_abort_transaction(trans, root, ret); | |
4182 | out: | |
71d7aed0 | 4183 | btrfs_free_path(path); |
79787eaa | 4184 | return ret; |
4df27c4d YZ |
4185 | } |
4186 | ||
39279cc3 CM |
4187 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
4188 | { | |
2b0143b5 | 4189 | struct inode *inode = d_inode(dentry); |
1832a6d5 | 4190 | int err = 0; |
39279cc3 | 4191 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 4192 | struct btrfs_trans_handle *trans; |
39279cc3 | 4193 | |
b3ae244e | 4194 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
134d4512 | 4195 | return -ENOTEMPTY; |
b3ae244e DS |
4196 | if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
4197 | return -EPERM; | |
134d4512 | 4198 | |
d52be818 | 4199 | trans = __unlink_start_trans(dir); |
a22285a6 | 4200 | if (IS_ERR(trans)) |
5df6a9f6 | 4201 | return PTR_ERR(trans); |
5df6a9f6 | 4202 | |
33345d01 | 4203 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
4df27c4d YZ |
4204 | err = btrfs_unlink_subvol(trans, root, dir, |
4205 | BTRFS_I(inode)->location.objectid, | |
4206 | dentry->d_name.name, | |
4207 | dentry->d_name.len); | |
4208 | goto out; | |
4209 | } | |
4210 | ||
7b128766 JB |
4211 | err = btrfs_orphan_add(trans, inode); |
4212 | if (err) | |
4df27c4d | 4213 | goto out; |
7b128766 | 4214 | |
39279cc3 | 4215 | /* now the directory is empty */ |
2b0143b5 | 4216 | err = btrfs_unlink_inode(trans, root, dir, d_inode(dentry), |
e02119d5 | 4217 | dentry->d_name.name, dentry->d_name.len); |
d397712b | 4218 | if (!err) |
dbe674a9 | 4219 | btrfs_i_size_write(inode, 0); |
4df27c4d | 4220 | out: |
d52be818 | 4221 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4222 | btrfs_btree_balance_dirty(root); |
3954401f | 4223 | |
39279cc3 CM |
4224 | return err; |
4225 | } | |
4226 | ||
28f75a0e CM |
4227 | static int truncate_space_check(struct btrfs_trans_handle *trans, |
4228 | struct btrfs_root *root, | |
4229 | u64 bytes_deleted) | |
4230 | { | |
4231 | int ret; | |
4232 | ||
4233 | bytes_deleted = btrfs_csum_bytes_to_leaves(root, bytes_deleted); | |
4234 | ret = btrfs_block_rsv_add(root, &root->fs_info->trans_block_rsv, | |
4235 | bytes_deleted, BTRFS_RESERVE_NO_FLUSH); | |
4236 | if (!ret) | |
4237 | trans->bytes_reserved += bytes_deleted; | |
4238 | return ret; | |
4239 | ||
4240 | } | |
4241 | ||
0305cd5f FM |
4242 | static int truncate_inline_extent(struct inode *inode, |
4243 | struct btrfs_path *path, | |
4244 | struct btrfs_key *found_key, | |
4245 | const u64 item_end, | |
4246 | const u64 new_size) | |
4247 | { | |
4248 | struct extent_buffer *leaf = path->nodes[0]; | |
4249 | int slot = path->slots[0]; | |
4250 | struct btrfs_file_extent_item *fi; | |
4251 | u32 size = (u32)(new_size - found_key->offset); | |
4252 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4253 | ||
4254 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
4255 | ||
4256 | if (btrfs_file_extent_compression(leaf, fi) != BTRFS_COMPRESS_NONE) { | |
4257 | loff_t offset = new_size; | |
4258 | loff_t page_end = ALIGN(offset, PAGE_CACHE_SIZE); | |
4259 | ||
4260 | /* | |
4261 | * Zero out the remaining of the last page of our inline extent, | |
4262 | * instead of directly truncating our inline extent here - that | |
4263 | * would be much more complex (decompressing all the data, then | |
4264 | * compressing the truncated data, which might be bigger than | |
4265 | * the size of the inline extent, resize the extent, etc). | |
4266 | * We release the path because to get the page we might need to | |
4267 | * read the extent item from disk (data not in the page cache). | |
4268 | */ | |
4269 | btrfs_release_path(path); | |
4270 | return btrfs_truncate_page(inode, offset, page_end - offset, 0); | |
4271 | } | |
4272 | ||
4273 | btrfs_set_file_extent_ram_bytes(leaf, fi, size); | |
4274 | size = btrfs_file_extent_calc_inline_size(size); | |
4275 | btrfs_truncate_item(root, path, size, 1); | |
4276 | ||
4277 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4278 | inode_sub_bytes(inode, item_end + 1 - new_size); | |
4279 | ||
4280 | return 0; | |
4281 | } | |
4282 | ||
39279cc3 CM |
4283 | /* |
4284 | * this can truncate away extent items, csum items and directory items. | |
4285 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 4286 | * any higher than new_size |
39279cc3 CM |
4287 | * |
4288 | * csum items that cross the new i_size are truncated to the new size | |
4289 | * as well. | |
7b128766 JB |
4290 | * |
4291 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
4292 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 4293 | */ |
8082510e YZ |
4294 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
4295 | struct btrfs_root *root, | |
4296 | struct inode *inode, | |
4297 | u64 new_size, u32 min_type) | |
39279cc3 | 4298 | { |
39279cc3 | 4299 | struct btrfs_path *path; |
5f39d397 | 4300 | struct extent_buffer *leaf; |
39279cc3 | 4301 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
4302 | struct btrfs_key key; |
4303 | struct btrfs_key found_key; | |
39279cc3 | 4304 | u64 extent_start = 0; |
db94535d | 4305 | u64 extent_num_bytes = 0; |
5d4f98a2 | 4306 | u64 extent_offset = 0; |
39279cc3 | 4307 | u64 item_end = 0; |
c1aa4575 | 4308 | u64 last_size = new_size; |
8082510e | 4309 | u32 found_type = (u8)-1; |
39279cc3 CM |
4310 | int found_extent; |
4311 | int del_item; | |
85e21bac CM |
4312 | int pending_del_nr = 0; |
4313 | int pending_del_slot = 0; | |
179e29e4 | 4314 | int extent_type = -1; |
8082510e YZ |
4315 | int ret; |
4316 | int err = 0; | |
33345d01 | 4317 | u64 ino = btrfs_ino(inode); |
28ed1345 | 4318 | u64 bytes_deleted = 0; |
1262133b JB |
4319 | bool be_nice = 0; |
4320 | bool should_throttle = 0; | |
28f75a0e | 4321 | bool should_end = 0; |
8082510e YZ |
4322 | |
4323 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 4324 | |
28ed1345 CM |
4325 | /* |
4326 | * for non-free space inodes and ref cows, we want to back off from | |
4327 | * time to time | |
4328 | */ | |
4329 | if (!btrfs_is_free_space_inode(inode) && | |
4330 | test_bit(BTRFS_ROOT_REF_COWS, &root->state)) | |
4331 | be_nice = 1; | |
4332 | ||
0eb0e19c MF |
4333 | path = btrfs_alloc_path(); |
4334 | if (!path) | |
4335 | return -ENOMEM; | |
4336 | path->reada = -1; | |
4337 | ||
5dc562c5 JB |
4338 | /* |
4339 | * We want to drop from the next block forward in case this new size is | |
4340 | * not block aligned since we will be keeping the last block of the | |
4341 | * extent just the way it is. | |
4342 | */ | |
27cdeb70 MX |
4343 | if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
4344 | root == root->fs_info->tree_root) | |
fda2832f QW |
4345 | btrfs_drop_extent_cache(inode, ALIGN(new_size, |
4346 | root->sectorsize), (u64)-1, 0); | |
8082510e | 4347 | |
16cdcec7 MX |
4348 | /* |
4349 | * This function is also used to drop the items in the log tree before | |
4350 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means | |
4351 | * it is used to drop the loged items. So we shouldn't kill the delayed | |
4352 | * items. | |
4353 | */ | |
4354 | if (min_type == 0 && root == BTRFS_I(inode)->root) | |
4355 | btrfs_kill_delayed_inode_items(inode); | |
4356 | ||
33345d01 | 4357 | key.objectid = ino; |
39279cc3 | 4358 | key.offset = (u64)-1; |
5f39d397 CM |
4359 | key.type = (u8)-1; |
4360 | ||
85e21bac | 4361 | search_again: |
28ed1345 CM |
4362 | /* |
4363 | * with a 16K leaf size and 128MB extents, you can actually queue | |
4364 | * up a huge file in a single leaf. Most of the time that | |
4365 | * bytes_deleted is > 0, it will be huge by the time we get here | |
4366 | */ | |
4367 | if (be_nice && bytes_deleted > 32 * 1024 * 1024) { | |
4368 | if (btrfs_should_end_transaction(trans, root)) { | |
4369 | err = -EAGAIN; | |
4370 | goto error; | |
4371 | } | |
4372 | } | |
4373 | ||
4374 | ||
b9473439 | 4375 | path->leave_spinning = 1; |
85e21bac | 4376 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
4377 | if (ret < 0) { |
4378 | err = ret; | |
4379 | goto out; | |
4380 | } | |
d397712b | 4381 | |
85e21bac | 4382 | if (ret > 0) { |
e02119d5 CM |
4383 | /* there are no items in the tree for us to truncate, we're |
4384 | * done | |
4385 | */ | |
8082510e YZ |
4386 | if (path->slots[0] == 0) |
4387 | goto out; | |
85e21bac CM |
4388 | path->slots[0]--; |
4389 | } | |
4390 | ||
d397712b | 4391 | while (1) { |
39279cc3 | 4392 | fi = NULL; |
5f39d397 CM |
4393 | leaf = path->nodes[0]; |
4394 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
962a298f | 4395 | found_type = found_key.type; |
39279cc3 | 4396 | |
33345d01 | 4397 | if (found_key.objectid != ino) |
39279cc3 | 4398 | break; |
5f39d397 | 4399 | |
85e21bac | 4400 | if (found_type < min_type) |
39279cc3 CM |
4401 | break; |
4402 | ||
5f39d397 | 4403 | item_end = found_key.offset; |
39279cc3 | 4404 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 4405 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 4406 | struct btrfs_file_extent_item); |
179e29e4 CM |
4407 | extent_type = btrfs_file_extent_type(leaf, fi); |
4408 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 4409 | item_end += |
db94535d | 4410 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 4411 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 4412 | item_end += btrfs_file_extent_inline_len(leaf, |
514ac8ad | 4413 | path->slots[0], fi); |
39279cc3 | 4414 | } |
008630c1 | 4415 | item_end--; |
39279cc3 | 4416 | } |
8082510e YZ |
4417 | if (found_type > min_type) { |
4418 | del_item = 1; | |
4419 | } else { | |
4420 | if (item_end < new_size) | |
b888db2b | 4421 | break; |
8082510e YZ |
4422 | if (found_key.offset >= new_size) |
4423 | del_item = 1; | |
4424 | else | |
4425 | del_item = 0; | |
39279cc3 | 4426 | } |
39279cc3 | 4427 | found_extent = 0; |
39279cc3 | 4428 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
4429 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
4430 | goto delete; | |
4431 | ||
7f4f6e0a JB |
4432 | if (del_item) |
4433 | last_size = found_key.offset; | |
4434 | else | |
4435 | last_size = new_size; | |
4436 | ||
179e29e4 | 4437 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
39279cc3 | 4438 | u64 num_dec; |
db94535d | 4439 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
f70a9a6b | 4440 | if (!del_item) { |
db94535d CM |
4441 | u64 orig_num_bytes = |
4442 | btrfs_file_extent_num_bytes(leaf, fi); | |
fda2832f QW |
4443 | extent_num_bytes = ALIGN(new_size - |
4444 | found_key.offset, | |
4445 | root->sectorsize); | |
db94535d CM |
4446 | btrfs_set_file_extent_num_bytes(leaf, fi, |
4447 | extent_num_bytes); | |
4448 | num_dec = (orig_num_bytes - | |
9069218d | 4449 | extent_num_bytes); |
27cdeb70 MX |
4450 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4451 | &root->state) && | |
4452 | extent_start != 0) | |
a76a3cd4 | 4453 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 4454 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 4455 | } else { |
db94535d CM |
4456 | extent_num_bytes = |
4457 | btrfs_file_extent_disk_num_bytes(leaf, | |
4458 | fi); | |
5d4f98a2 YZ |
4459 | extent_offset = found_key.offset - |
4460 | btrfs_file_extent_offset(leaf, fi); | |
4461 | ||
39279cc3 | 4462 | /* FIXME blocksize != 4096 */ |
9069218d | 4463 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
4464 | if (extent_start != 0) { |
4465 | found_extent = 1; | |
27cdeb70 MX |
4466 | if (test_bit(BTRFS_ROOT_REF_COWS, |
4467 | &root->state)) | |
a76a3cd4 | 4468 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 4469 | } |
39279cc3 | 4470 | } |
9069218d | 4471 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
4472 | /* |
4473 | * we can't truncate inline items that have had | |
4474 | * special encodings | |
4475 | */ | |
4476 | if (!del_item && | |
c8b97818 CM |
4477 | btrfs_file_extent_encryption(leaf, fi) == 0 && |
4478 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
514ac8ad CM |
4479 | |
4480 | /* | |
0305cd5f FM |
4481 | * Need to release path in order to truncate a |
4482 | * compressed extent. So delete any accumulated | |
4483 | * extent items so far. | |
514ac8ad | 4484 | */ |
0305cd5f FM |
4485 | if (btrfs_file_extent_compression(leaf, fi) != |
4486 | BTRFS_COMPRESS_NONE && pending_del_nr) { | |
4487 | err = btrfs_del_items(trans, root, path, | |
4488 | pending_del_slot, | |
4489 | pending_del_nr); | |
4490 | if (err) { | |
4491 | btrfs_abort_transaction(trans, | |
4492 | root, | |
4493 | err); | |
4494 | goto error; | |
4495 | } | |
4496 | pending_del_nr = 0; | |
4497 | } | |
4498 | ||
4499 | err = truncate_inline_extent(inode, path, | |
4500 | &found_key, | |
4501 | item_end, | |
4502 | new_size); | |
4503 | if (err) { | |
4504 | btrfs_abort_transaction(trans, | |
4505 | root, err); | |
4506 | goto error; | |
4507 | } | |
27cdeb70 MX |
4508 | } else if (test_bit(BTRFS_ROOT_REF_COWS, |
4509 | &root->state)) { | |
0305cd5f | 4510 | inode_sub_bytes(inode, item_end + 1 - new_size); |
9069218d | 4511 | } |
39279cc3 | 4512 | } |
179e29e4 | 4513 | delete: |
39279cc3 | 4514 | if (del_item) { |
85e21bac CM |
4515 | if (!pending_del_nr) { |
4516 | /* no pending yet, add ourselves */ | |
4517 | pending_del_slot = path->slots[0]; | |
4518 | pending_del_nr = 1; | |
4519 | } else if (pending_del_nr && | |
4520 | path->slots[0] + 1 == pending_del_slot) { | |
4521 | /* hop on the pending chunk */ | |
4522 | pending_del_nr++; | |
4523 | pending_del_slot = path->slots[0]; | |
4524 | } else { | |
d397712b | 4525 | BUG(); |
85e21bac | 4526 | } |
39279cc3 CM |
4527 | } else { |
4528 | break; | |
4529 | } | |
28f75a0e CM |
4530 | should_throttle = 0; |
4531 | ||
27cdeb70 MX |
4532 | if (found_extent && |
4533 | (test_bit(BTRFS_ROOT_REF_COWS, &root->state) || | |
4534 | root == root->fs_info->tree_root)) { | |
b9473439 | 4535 | btrfs_set_path_blocking(path); |
28ed1345 | 4536 | bytes_deleted += extent_num_bytes; |
39279cc3 | 4537 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
4538 | extent_num_bytes, 0, |
4539 | btrfs_header_owner(leaf), | |
b06c4bf5 | 4540 | ino, extent_offset); |
39279cc3 | 4541 | BUG_ON(ret); |
1262133b | 4542 | if (btrfs_should_throttle_delayed_refs(trans, root)) |
28ed1345 CM |
4543 | btrfs_async_run_delayed_refs(root, |
4544 | trans->delayed_ref_updates * 2, 0); | |
28f75a0e CM |
4545 | if (be_nice) { |
4546 | if (truncate_space_check(trans, root, | |
4547 | extent_num_bytes)) { | |
4548 | should_end = 1; | |
4549 | } | |
4550 | if (btrfs_should_throttle_delayed_refs(trans, | |
4551 | root)) { | |
4552 | should_throttle = 1; | |
4553 | } | |
4554 | } | |
39279cc3 | 4555 | } |
85e21bac | 4556 | |
8082510e YZ |
4557 | if (found_type == BTRFS_INODE_ITEM_KEY) |
4558 | break; | |
4559 | ||
4560 | if (path->slots[0] == 0 || | |
1262133b | 4561 | path->slots[0] != pending_del_slot || |
28f75a0e | 4562 | should_throttle || should_end) { |
8082510e YZ |
4563 | if (pending_del_nr) { |
4564 | ret = btrfs_del_items(trans, root, path, | |
4565 | pending_del_slot, | |
4566 | pending_del_nr); | |
79787eaa JM |
4567 | if (ret) { |
4568 | btrfs_abort_transaction(trans, | |
4569 | root, ret); | |
4570 | goto error; | |
4571 | } | |
8082510e YZ |
4572 | pending_del_nr = 0; |
4573 | } | |
b3b4aa74 | 4574 | btrfs_release_path(path); |
28f75a0e | 4575 | if (should_throttle) { |
1262133b JB |
4576 | unsigned long updates = trans->delayed_ref_updates; |
4577 | if (updates) { | |
4578 | trans->delayed_ref_updates = 0; | |
4579 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4580 | if (ret && !err) | |
4581 | err = ret; | |
4582 | } | |
4583 | } | |
28f75a0e CM |
4584 | /* |
4585 | * if we failed to refill our space rsv, bail out | |
4586 | * and let the transaction restart | |
4587 | */ | |
4588 | if (should_end) { | |
4589 | err = -EAGAIN; | |
4590 | goto error; | |
4591 | } | |
85e21bac | 4592 | goto search_again; |
8082510e YZ |
4593 | } else { |
4594 | path->slots[0]--; | |
85e21bac | 4595 | } |
39279cc3 | 4596 | } |
8082510e | 4597 | out: |
85e21bac CM |
4598 | if (pending_del_nr) { |
4599 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
4600 | pending_del_nr); | |
79787eaa JM |
4601 | if (ret) |
4602 | btrfs_abort_transaction(trans, root, ret); | |
85e21bac | 4603 | } |
79787eaa | 4604 | error: |
c1aa4575 | 4605 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
7f4f6e0a | 4606 | btrfs_ordered_update_i_size(inode, last_size, NULL); |
28ed1345 | 4607 | |
39279cc3 | 4608 | btrfs_free_path(path); |
28ed1345 | 4609 | |
28f75a0e | 4610 | if (be_nice && bytes_deleted > 32 * 1024 * 1024) { |
28ed1345 CM |
4611 | unsigned long updates = trans->delayed_ref_updates; |
4612 | if (updates) { | |
4613 | trans->delayed_ref_updates = 0; | |
4614 | ret = btrfs_run_delayed_refs(trans, root, updates * 2); | |
4615 | if (ret && !err) | |
4616 | err = ret; | |
4617 | } | |
4618 | } | |
8082510e | 4619 | return err; |
39279cc3 CM |
4620 | } |
4621 | ||
4622 | /* | |
2aaa6655 JB |
4623 | * btrfs_truncate_page - read, zero a chunk and write a page |
4624 | * @inode - inode that we're zeroing | |
4625 | * @from - the offset to start zeroing | |
4626 | * @len - the length to zero, 0 to zero the entire range respective to the | |
4627 | * offset | |
4628 | * @front - zero up to the offset instead of from the offset on | |
4629 | * | |
4630 | * This will find the page for the "from" offset and cow the page and zero the | |
4631 | * part we want to zero. This is used with truncate and hole punching. | |
39279cc3 | 4632 | */ |
2aaa6655 JB |
4633 | int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, |
4634 | int front) | |
39279cc3 | 4635 | { |
2aaa6655 | 4636 | struct address_space *mapping = inode->i_mapping; |
db94535d | 4637 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
4638 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
4639 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 4640 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 4641 | char *kaddr; |
db94535d | 4642 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
4643 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
4644 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
4645 | struct page *page; | |
3b16a4e3 | 4646 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
39279cc3 | 4647 | int ret = 0; |
a52d9a80 | 4648 | u64 page_start; |
e6dcd2dc | 4649 | u64 page_end; |
39279cc3 | 4650 | |
2aaa6655 JB |
4651 | if ((offset & (blocksize - 1)) == 0 && |
4652 | (!len || ((len & (blocksize - 1)) == 0))) | |
39279cc3 | 4653 | goto out; |
7cf5b976 | 4654 | ret = btrfs_delalloc_reserve_space(inode, |
df480633 | 4655 | round_down(from, PAGE_CACHE_SIZE), PAGE_CACHE_SIZE); |
5d5e103a JB |
4656 | if (ret) |
4657 | goto out; | |
39279cc3 | 4658 | |
211c17f5 | 4659 | again: |
3b16a4e3 | 4660 | page = find_or_create_page(mapping, index, mask); |
5d5e103a | 4661 | if (!page) { |
7cf5b976 | 4662 | btrfs_delalloc_release_space(inode, |
df480633 QW |
4663 | round_down(from, PAGE_CACHE_SIZE), |
4664 | PAGE_CACHE_SIZE); | |
ac6a2b36 | 4665 | ret = -ENOMEM; |
39279cc3 | 4666 | goto out; |
5d5e103a | 4667 | } |
e6dcd2dc CM |
4668 | |
4669 | page_start = page_offset(page); | |
4670 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
4671 | ||
39279cc3 | 4672 | if (!PageUptodate(page)) { |
9ebefb18 | 4673 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 4674 | lock_page(page); |
211c17f5 CM |
4675 | if (page->mapping != mapping) { |
4676 | unlock_page(page); | |
4677 | page_cache_release(page); | |
4678 | goto again; | |
4679 | } | |
39279cc3 CM |
4680 | if (!PageUptodate(page)) { |
4681 | ret = -EIO; | |
89642229 | 4682 | goto out_unlock; |
39279cc3 CM |
4683 | } |
4684 | } | |
211c17f5 | 4685 | wait_on_page_writeback(page); |
e6dcd2dc | 4686 | |
d0082371 | 4687 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
4688 | set_page_extent_mapped(page); |
4689 | ||
4690 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
4691 | if (ordered) { | |
2ac55d41 JB |
4692 | unlock_extent_cached(io_tree, page_start, page_end, |
4693 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
4694 | unlock_page(page); |
4695 | page_cache_release(page); | |
eb84ae03 | 4696 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
4697 | btrfs_put_ordered_extent(ordered); |
4698 | goto again; | |
4699 | } | |
4700 | ||
2ac55d41 | 4701 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
4702 | EXTENT_DIRTY | EXTENT_DELALLOC | |
4703 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 4704 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 4705 | |
2ac55d41 JB |
4706 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
4707 | &cached_state); | |
9ed74f2d | 4708 | if (ret) { |
2ac55d41 JB |
4709 | unlock_extent_cached(io_tree, page_start, page_end, |
4710 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
4711 | goto out_unlock; |
4712 | } | |
4713 | ||
e6dcd2dc | 4714 | if (offset != PAGE_CACHE_SIZE) { |
2aaa6655 JB |
4715 | if (!len) |
4716 | len = PAGE_CACHE_SIZE - offset; | |
e6dcd2dc | 4717 | kaddr = kmap(page); |
2aaa6655 JB |
4718 | if (front) |
4719 | memset(kaddr, 0, offset); | |
4720 | else | |
4721 | memset(kaddr + offset, 0, len); | |
e6dcd2dc CM |
4722 | flush_dcache_page(page); |
4723 | kunmap(page); | |
4724 | } | |
247e743c | 4725 | ClearPageChecked(page); |
e6dcd2dc | 4726 | set_page_dirty(page); |
2ac55d41 JB |
4727 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
4728 | GFP_NOFS); | |
39279cc3 | 4729 | |
89642229 | 4730 | out_unlock: |
5d5e103a | 4731 | if (ret) |
7cf5b976 QW |
4732 | btrfs_delalloc_release_space(inode, page_start, |
4733 | PAGE_CACHE_SIZE); | |
39279cc3 CM |
4734 | unlock_page(page); |
4735 | page_cache_release(page); | |
4736 | out: | |
4737 | return ret; | |
4738 | } | |
4739 | ||
16e7549f JB |
4740 | static int maybe_insert_hole(struct btrfs_root *root, struct inode *inode, |
4741 | u64 offset, u64 len) | |
4742 | { | |
4743 | struct btrfs_trans_handle *trans; | |
4744 | int ret; | |
4745 | ||
4746 | /* | |
4747 | * Still need to make sure the inode looks like it's been updated so | |
4748 | * that any holes get logged if we fsync. | |
4749 | */ | |
4750 | if (btrfs_fs_incompat(root->fs_info, NO_HOLES)) { | |
4751 | BTRFS_I(inode)->last_trans = root->fs_info->generation; | |
4752 | BTRFS_I(inode)->last_sub_trans = root->log_transid; | |
4753 | BTRFS_I(inode)->last_log_commit = root->last_log_commit; | |
4754 | return 0; | |
4755 | } | |
4756 | ||
4757 | /* | |
4758 | * 1 - for the one we're dropping | |
4759 | * 1 - for the one we're adding | |
4760 | * 1 - for updating the inode. | |
4761 | */ | |
4762 | trans = btrfs_start_transaction(root, 3); | |
4763 | if (IS_ERR(trans)) | |
4764 | return PTR_ERR(trans); | |
4765 | ||
4766 | ret = btrfs_drop_extents(trans, root, inode, offset, offset + len, 1); | |
4767 | if (ret) { | |
4768 | btrfs_abort_transaction(trans, root, ret); | |
4769 | btrfs_end_transaction(trans, root); | |
4770 | return ret; | |
4771 | } | |
4772 | ||
4773 | ret = btrfs_insert_file_extent(trans, root, btrfs_ino(inode), offset, | |
4774 | 0, 0, len, 0, len, 0, 0, 0); | |
4775 | if (ret) | |
4776 | btrfs_abort_transaction(trans, root, ret); | |
4777 | else | |
4778 | btrfs_update_inode(trans, root, inode); | |
4779 | btrfs_end_transaction(trans, root); | |
4780 | return ret; | |
4781 | } | |
4782 | ||
695a0d0d JB |
4783 | /* |
4784 | * This function puts in dummy file extents for the area we're creating a hole | |
4785 | * for. So if we are truncating this file to a larger size we need to insert | |
4786 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for | |
4787 | * the range between oldsize and size | |
4788 | */ | |
a41ad394 | 4789 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
39279cc3 | 4790 | { |
9036c102 YZ |
4791 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4792 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 4793 | struct extent_map *em = NULL; |
2ac55d41 | 4794 | struct extent_state *cached_state = NULL; |
5dc562c5 | 4795 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
fda2832f QW |
4796 | u64 hole_start = ALIGN(oldsize, root->sectorsize); |
4797 | u64 block_end = ALIGN(size, root->sectorsize); | |
9036c102 YZ |
4798 | u64 last_byte; |
4799 | u64 cur_offset; | |
4800 | u64 hole_size; | |
9ed74f2d | 4801 | int err = 0; |
39279cc3 | 4802 | |
a71754fc JB |
4803 | /* |
4804 | * If our size started in the middle of a page we need to zero out the | |
4805 | * rest of the page before we expand the i_size, otherwise we could | |
4806 | * expose stale data. | |
4807 | */ | |
4808 | err = btrfs_truncate_page(inode, oldsize, 0, 0); | |
4809 | if (err) | |
4810 | return err; | |
4811 | ||
9036c102 YZ |
4812 | if (size <= hole_start) |
4813 | return 0; | |
4814 | ||
9036c102 YZ |
4815 | while (1) { |
4816 | struct btrfs_ordered_extent *ordered; | |
fa7c1494 | 4817 | |
2ac55d41 | 4818 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
d0082371 | 4819 | &cached_state); |
fa7c1494 MX |
4820 | ordered = btrfs_lookup_ordered_range(inode, hole_start, |
4821 | block_end - hole_start); | |
9036c102 YZ |
4822 | if (!ordered) |
4823 | break; | |
2ac55d41 JB |
4824 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
4825 | &cached_state, GFP_NOFS); | |
fa7c1494 | 4826 | btrfs_start_ordered_extent(inode, ordered, 1); |
9036c102 YZ |
4827 | btrfs_put_ordered_extent(ordered); |
4828 | } | |
39279cc3 | 4829 | |
9036c102 YZ |
4830 | cur_offset = hole_start; |
4831 | while (1) { | |
4832 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
4833 | block_end - cur_offset, 0); | |
79787eaa JM |
4834 | if (IS_ERR(em)) { |
4835 | err = PTR_ERR(em); | |
f2767956 | 4836 | em = NULL; |
79787eaa JM |
4837 | break; |
4838 | } | |
9036c102 | 4839 | last_byte = min(extent_map_end(em), block_end); |
fda2832f | 4840 | last_byte = ALIGN(last_byte , root->sectorsize); |
8082510e | 4841 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
5dc562c5 | 4842 | struct extent_map *hole_em; |
9036c102 | 4843 | hole_size = last_byte - cur_offset; |
9ed74f2d | 4844 | |
16e7549f JB |
4845 | err = maybe_insert_hole(root, inode, cur_offset, |
4846 | hole_size); | |
4847 | if (err) | |
3893e33b | 4848 | break; |
5dc562c5 JB |
4849 | btrfs_drop_extent_cache(inode, cur_offset, |
4850 | cur_offset + hole_size - 1, 0); | |
4851 | hole_em = alloc_extent_map(); | |
4852 | if (!hole_em) { | |
4853 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
4854 | &BTRFS_I(inode)->runtime_flags); | |
4855 | goto next; | |
4856 | } | |
4857 | hole_em->start = cur_offset; | |
4858 | hole_em->len = hole_size; | |
4859 | hole_em->orig_start = cur_offset; | |
8082510e | 4860 | |
5dc562c5 JB |
4861 | hole_em->block_start = EXTENT_MAP_HOLE; |
4862 | hole_em->block_len = 0; | |
b4939680 | 4863 | hole_em->orig_block_len = 0; |
cc95bef6 | 4864 | hole_em->ram_bytes = hole_size; |
5dc562c5 JB |
4865 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
4866 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
16e7549f | 4867 | hole_em->generation = root->fs_info->generation; |
8082510e | 4868 | |
5dc562c5 JB |
4869 | while (1) { |
4870 | write_lock(&em_tree->lock); | |
09a2a8f9 | 4871 | err = add_extent_mapping(em_tree, hole_em, 1); |
5dc562c5 JB |
4872 | write_unlock(&em_tree->lock); |
4873 | if (err != -EEXIST) | |
4874 | break; | |
4875 | btrfs_drop_extent_cache(inode, cur_offset, | |
4876 | cur_offset + | |
4877 | hole_size - 1, 0); | |
4878 | } | |
4879 | free_extent_map(hole_em); | |
9036c102 | 4880 | } |
16e7549f | 4881 | next: |
9036c102 | 4882 | free_extent_map(em); |
a22285a6 | 4883 | em = NULL; |
9036c102 | 4884 | cur_offset = last_byte; |
8082510e | 4885 | if (cur_offset >= block_end) |
9036c102 YZ |
4886 | break; |
4887 | } | |
a22285a6 | 4888 | free_extent_map(em); |
2ac55d41 JB |
4889 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
4890 | GFP_NOFS); | |
9036c102 YZ |
4891 | return err; |
4892 | } | |
39279cc3 | 4893 | |
9ea24bbe FM |
4894 | static int wait_snapshoting_atomic_t(atomic_t *a) |
4895 | { | |
4896 | schedule(); | |
4897 | return 0; | |
4898 | } | |
4899 | ||
4900 | static void wait_for_snapshot_creation(struct btrfs_root *root) | |
4901 | { | |
4902 | while (true) { | |
4903 | int ret; | |
4904 | ||
4905 | ret = btrfs_start_write_no_snapshoting(root); | |
4906 | if (ret) | |
4907 | break; | |
4908 | wait_on_atomic_t(&root->will_be_snapshoted, | |
4909 | wait_snapshoting_atomic_t, | |
4910 | TASK_UNINTERRUPTIBLE); | |
4911 | } | |
4912 | } | |
4913 | ||
3972f260 | 4914 | static int btrfs_setsize(struct inode *inode, struct iattr *attr) |
8082510e | 4915 | { |
f4a2f4c5 MX |
4916 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4917 | struct btrfs_trans_handle *trans; | |
a41ad394 | 4918 | loff_t oldsize = i_size_read(inode); |
3972f260 ES |
4919 | loff_t newsize = attr->ia_size; |
4920 | int mask = attr->ia_valid; | |
8082510e YZ |
4921 | int ret; |
4922 | ||
3972f260 ES |
4923 | /* |
4924 | * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a | |
4925 | * special case where we need to update the times despite not having | |
4926 | * these flags set. For all other operations the VFS set these flags | |
4927 | * explicitly if it wants a timestamp update. | |
4928 | */ | |
dff6efc3 CH |
4929 | if (newsize != oldsize) { |
4930 | inode_inc_iversion(inode); | |
4931 | if (!(mask & (ATTR_CTIME | ATTR_MTIME))) | |
4932 | inode->i_ctime = inode->i_mtime = | |
4933 | current_fs_time(inode->i_sb); | |
4934 | } | |
3972f260 | 4935 | |
a41ad394 | 4936 | if (newsize > oldsize) { |
7caef267 | 4937 | truncate_pagecache(inode, newsize); |
9ea24bbe FM |
4938 | /* |
4939 | * Don't do an expanding truncate while snapshoting is ongoing. | |
4940 | * This is to ensure the snapshot captures a fully consistent | |
4941 | * state of this file - if the snapshot captures this expanding | |
4942 | * truncation, it must capture all writes that happened before | |
4943 | * this truncation. | |
4944 | */ | |
4945 | wait_for_snapshot_creation(root); | |
a41ad394 | 4946 | ret = btrfs_cont_expand(inode, oldsize, newsize); |
9ea24bbe FM |
4947 | if (ret) { |
4948 | btrfs_end_write_no_snapshoting(root); | |
8082510e | 4949 | return ret; |
9ea24bbe | 4950 | } |
8082510e | 4951 | |
f4a2f4c5 | 4952 | trans = btrfs_start_transaction(root, 1); |
9ea24bbe FM |
4953 | if (IS_ERR(trans)) { |
4954 | btrfs_end_write_no_snapshoting(root); | |
f4a2f4c5 | 4955 | return PTR_ERR(trans); |
9ea24bbe | 4956 | } |
f4a2f4c5 MX |
4957 | |
4958 | i_size_write(inode, newsize); | |
4959 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); | |
4960 | ret = btrfs_update_inode(trans, root, inode); | |
9ea24bbe | 4961 | btrfs_end_write_no_snapshoting(root); |
7ad85bb7 | 4962 | btrfs_end_transaction(trans, root); |
a41ad394 | 4963 | } else { |
8082510e | 4964 | |
a41ad394 JB |
4965 | /* |
4966 | * We're truncating a file that used to have good data down to | |
4967 | * zero. Make sure it gets into the ordered flush list so that | |
4968 | * any new writes get down to disk quickly. | |
4969 | */ | |
4970 | if (newsize == 0) | |
72ac3c0d JB |
4971 | set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
4972 | &BTRFS_I(inode)->runtime_flags); | |
8082510e | 4973 | |
f3fe820c JB |
4974 | /* |
4975 | * 1 for the orphan item we're going to add | |
4976 | * 1 for the orphan item deletion. | |
4977 | */ | |
4978 | trans = btrfs_start_transaction(root, 2); | |
4979 | if (IS_ERR(trans)) | |
4980 | return PTR_ERR(trans); | |
4981 | ||
4982 | /* | |
4983 | * We need to do this in case we fail at _any_ point during the | |
4984 | * actual truncate. Once we do the truncate_setsize we could | |
4985 | * invalidate pages which forces any outstanding ordered io to | |
4986 | * be instantly completed which will give us extents that need | |
4987 | * to be truncated. If we fail to get an orphan inode down we | |
4988 | * could have left over extents that were never meant to live, | |
4989 | * so we need to garuntee from this point on that everything | |
4990 | * will be consistent. | |
4991 | */ | |
4992 | ret = btrfs_orphan_add(trans, inode); | |
4993 | btrfs_end_transaction(trans, root); | |
4994 | if (ret) | |
4995 | return ret; | |
4996 | ||
a41ad394 JB |
4997 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
4998 | truncate_setsize(inode, newsize); | |
2e60a51e MX |
4999 | |
5000 | /* Disable nonlocked read DIO to avoid the end less truncate */ | |
5001 | btrfs_inode_block_unlocked_dio(inode); | |
5002 | inode_dio_wait(inode); | |
5003 | btrfs_inode_resume_unlocked_dio(inode); | |
5004 | ||
a41ad394 | 5005 | ret = btrfs_truncate(inode); |
7f4f6e0a JB |
5006 | if (ret && inode->i_nlink) { |
5007 | int err; | |
5008 | ||
5009 | /* | |
5010 | * failed to truncate, disk_i_size is only adjusted down | |
5011 | * as we remove extents, so it should represent the true | |
5012 | * size of the inode, so reset the in memory size and | |
5013 | * delete our orphan entry. | |
5014 | */ | |
5015 | trans = btrfs_join_transaction(root); | |
5016 | if (IS_ERR(trans)) { | |
5017 | btrfs_orphan_del(NULL, inode); | |
5018 | return ret; | |
5019 | } | |
5020 | i_size_write(inode, BTRFS_I(inode)->disk_i_size); | |
5021 | err = btrfs_orphan_del(trans, inode); | |
5022 | if (err) | |
5023 | btrfs_abort_transaction(trans, root, err); | |
5024 | btrfs_end_transaction(trans, root); | |
5025 | } | |
8082510e YZ |
5026 | } |
5027 | ||
a41ad394 | 5028 | return ret; |
8082510e YZ |
5029 | } |
5030 | ||
9036c102 YZ |
5031 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
5032 | { | |
2b0143b5 | 5033 | struct inode *inode = d_inode(dentry); |
b83cc969 | 5034 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 5035 | int err; |
39279cc3 | 5036 | |
b83cc969 LZ |
5037 | if (btrfs_root_readonly(root)) |
5038 | return -EROFS; | |
5039 | ||
9036c102 YZ |
5040 | err = inode_change_ok(inode, attr); |
5041 | if (err) | |
5042 | return err; | |
2bf5a725 | 5043 | |
5a3f23d5 | 5044 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
3972f260 | 5045 | err = btrfs_setsize(inode, attr); |
8082510e YZ |
5046 | if (err) |
5047 | return err; | |
39279cc3 | 5048 | } |
9036c102 | 5049 | |
1025774c CH |
5050 | if (attr->ia_valid) { |
5051 | setattr_copy(inode, attr); | |
0c4d2d95 | 5052 | inode_inc_iversion(inode); |
22c44fe6 | 5053 | err = btrfs_dirty_inode(inode); |
1025774c | 5054 | |
22c44fe6 | 5055 | if (!err && attr->ia_valid & ATTR_MODE) |
996a710d | 5056 | err = posix_acl_chmod(inode, inode->i_mode); |
1025774c | 5057 | } |
33268eaf | 5058 | |
39279cc3 CM |
5059 | return err; |
5060 | } | |
61295eb8 | 5061 | |
131e404a FDBM |
5062 | /* |
5063 | * While truncating the inode pages during eviction, we get the VFS calling | |
5064 | * btrfs_invalidatepage() against each page of the inode. This is slow because | |
5065 | * the calls to btrfs_invalidatepage() result in a huge amount of calls to | |
5066 | * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting | |
5067 | * extent_state structures over and over, wasting lots of time. | |
5068 | * | |
5069 | * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all | |
5070 | * those expensive operations on a per page basis and do only the ordered io | |
5071 | * finishing, while we release here the extent_map and extent_state structures, | |
5072 | * without the excessive merging and splitting. | |
5073 | */ | |
5074 | static void evict_inode_truncate_pages(struct inode *inode) | |
5075 | { | |
5076 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
5077 | struct extent_map_tree *map_tree = &BTRFS_I(inode)->extent_tree; | |
5078 | struct rb_node *node; | |
5079 | ||
5080 | ASSERT(inode->i_state & I_FREEING); | |
91b0abe3 | 5081 | truncate_inode_pages_final(&inode->i_data); |
131e404a FDBM |
5082 | |
5083 | write_lock(&map_tree->lock); | |
5084 | while (!RB_EMPTY_ROOT(&map_tree->map)) { | |
5085 | struct extent_map *em; | |
5086 | ||
5087 | node = rb_first(&map_tree->map); | |
5088 | em = rb_entry(node, struct extent_map, rb_node); | |
180589ef WS |
5089 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); |
5090 | clear_bit(EXTENT_FLAG_LOGGING, &em->flags); | |
131e404a FDBM |
5091 | remove_extent_mapping(map_tree, em); |
5092 | free_extent_map(em); | |
7064dd5c FM |
5093 | if (need_resched()) { |
5094 | write_unlock(&map_tree->lock); | |
5095 | cond_resched(); | |
5096 | write_lock(&map_tree->lock); | |
5097 | } | |
131e404a FDBM |
5098 | } |
5099 | write_unlock(&map_tree->lock); | |
5100 | ||
6ca07097 FM |
5101 | /* |
5102 | * Keep looping until we have no more ranges in the io tree. | |
5103 | * We can have ongoing bios started by readpages (called from readahead) | |
9c6429d9 FM |
5104 | * that have their endio callback (extent_io.c:end_bio_extent_readpage) |
5105 | * still in progress (unlocked the pages in the bio but did not yet | |
5106 | * unlocked the ranges in the io tree). Therefore this means some | |
6ca07097 FM |
5107 | * ranges can still be locked and eviction started because before |
5108 | * submitting those bios, which are executed by a separate task (work | |
5109 | * queue kthread), inode references (inode->i_count) were not taken | |
5110 | * (which would be dropped in the end io callback of each bio). | |
5111 | * Therefore here we effectively end up waiting for those bios and | |
5112 | * anyone else holding locked ranges without having bumped the inode's | |
5113 | * reference count - if we don't do it, when they access the inode's | |
5114 | * io_tree to unlock a range it may be too late, leading to an | |
5115 | * use-after-free issue. | |
5116 | */ | |
131e404a FDBM |
5117 | spin_lock(&io_tree->lock); |
5118 | while (!RB_EMPTY_ROOT(&io_tree->state)) { | |
5119 | struct extent_state *state; | |
5120 | struct extent_state *cached_state = NULL; | |
6ca07097 FM |
5121 | u64 start; |
5122 | u64 end; | |
131e404a FDBM |
5123 | |
5124 | node = rb_first(&io_tree->state); | |
5125 | state = rb_entry(node, struct extent_state, rb_node); | |
6ca07097 FM |
5126 | start = state->start; |
5127 | end = state->end; | |
131e404a FDBM |
5128 | spin_unlock(&io_tree->lock); |
5129 | ||
6ca07097 | 5130 | lock_extent_bits(io_tree, start, end, 0, &cached_state); |
b9d0b389 QW |
5131 | |
5132 | /* | |
5133 | * If still has DELALLOC flag, the extent didn't reach disk, | |
5134 | * and its reserved space won't be freed by delayed_ref. | |
5135 | * So we need to free its reserved space here. | |
5136 | * (Refer to comment in btrfs_invalidatepage, case 2) | |
5137 | * | |
5138 | * Note, end is the bytenr of last byte, so we need + 1 here. | |
5139 | */ | |
5140 | if (state->state & EXTENT_DELALLOC) | |
5141 | btrfs_qgroup_free_data(inode, start, end - start + 1); | |
5142 | ||
6ca07097 | 5143 | clear_extent_bit(io_tree, start, end, |
131e404a FDBM |
5144 | EXTENT_LOCKED | EXTENT_DIRTY | |
5145 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
5146 | EXTENT_DEFRAG, 1, 1, | |
5147 | &cached_state, GFP_NOFS); | |
131e404a | 5148 | |
7064dd5c | 5149 | cond_resched(); |
131e404a FDBM |
5150 | spin_lock(&io_tree->lock); |
5151 | } | |
5152 | spin_unlock(&io_tree->lock); | |
5153 | } | |
5154 | ||
bd555975 | 5155 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
5156 | { |
5157 | struct btrfs_trans_handle *trans; | |
5158 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
726c35fa | 5159 | struct btrfs_block_rsv *rsv, *global_rsv; |
3bce876f | 5160 | int steal_from_global = 0; |
07127184 | 5161 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 CM |
5162 | int ret; |
5163 | ||
1abe9b8a | 5164 | trace_btrfs_inode_evict(inode); |
5165 | ||
131e404a FDBM |
5166 | evict_inode_truncate_pages(inode); |
5167 | ||
69e9c6c6 SB |
5168 | if (inode->i_nlink && |
5169 | ((btrfs_root_refs(&root->root_item) != 0 && | |
5170 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID) || | |
5171 | btrfs_is_free_space_inode(inode))) | |
bd555975 AV |
5172 | goto no_delete; |
5173 | ||
39279cc3 | 5174 | if (is_bad_inode(inode)) { |
7b128766 | 5175 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
5176 | goto no_delete; |
5177 | } | |
bd555975 | 5178 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
a30e577c JM |
5179 | if (!special_file(inode->i_mode)) |
5180 | btrfs_wait_ordered_range(inode, 0, (u64)-1); | |
5f39d397 | 5181 | |
f612496b MX |
5182 | btrfs_free_io_failure_record(inode, 0, (u64)-1); |
5183 | ||
c71bf099 | 5184 | if (root->fs_info->log_root_recovering) { |
6bf02314 | 5185 | BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
8a35d95f | 5186 | &BTRFS_I(inode)->runtime_flags)); |
c71bf099 YZ |
5187 | goto no_delete; |
5188 | } | |
5189 | ||
76dda93c | 5190 | if (inode->i_nlink > 0) { |
69e9c6c6 SB |
5191 | BUG_ON(btrfs_root_refs(&root->root_item) != 0 && |
5192 | root->root_key.objectid != BTRFS_ROOT_TREE_OBJECTID); | |
76dda93c YZ |
5193 | goto no_delete; |
5194 | } | |
5195 | ||
0e8c36a9 MX |
5196 | ret = btrfs_commit_inode_delayed_inode(inode); |
5197 | if (ret) { | |
5198 | btrfs_orphan_del(NULL, inode); | |
5199 | goto no_delete; | |
5200 | } | |
5201 | ||
66d8f3dd | 5202 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
4289a667 JB |
5203 | if (!rsv) { |
5204 | btrfs_orphan_del(NULL, inode); | |
5205 | goto no_delete; | |
5206 | } | |
4a338542 | 5207 | rsv->size = min_size; |
ca7e70f5 | 5208 | rsv->failfast = 1; |
726c35fa | 5209 | global_rsv = &root->fs_info->global_block_rsv; |
4289a667 | 5210 | |
dbe674a9 | 5211 | btrfs_i_size_write(inode, 0); |
5f39d397 | 5212 | |
4289a667 | 5213 | /* |
8407aa46 MX |
5214 | * This is a bit simpler than btrfs_truncate since we've already |
5215 | * reserved our space for our orphan item in the unlink, so we just | |
5216 | * need to reserve some slack space in case we add bytes and update | |
5217 | * inode item when doing the truncate. | |
4289a667 | 5218 | */ |
8082510e | 5219 | while (1) { |
08e007d2 MX |
5220 | ret = btrfs_block_rsv_refill(root, rsv, min_size, |
5221 | BTRFS_RESERVE_FLUSH_LIMIT); | |
726c35fa JB |
5222 | |
5223 | /* | |
5224 | * Try and steal from the global reserve since we will | |
5225 | * likely not use this space anyway, we want to try as | |
5226 | * hard as possible to get this to work. | |
5227 | */ | |
5228 | if (ret) | |
3bce876f JB |
5229 | steal_from_global++; |
5230 | else | |
5231 | steal_from_global = 0; | |
5232 | ret = 0; | |
d68fc57b | 5233 | |
3bce876f JB |
5234 | /* |
5235 | * steal_from_global == 0: we reserved stuff, hooray! | |
5236 | * steal_from_global == 1: we didn't reserve stuff, boo! | |
5237 | * steal_from_global == 2: we've committed, still not a lot of | |
5238 | * room but maybe we'll have room in the global reserve this | |
5239 | * time. | |
5240 | * steal_from_global == 3: abandon all hope! | |
5241 | */ | |
5242 | if (steal_from_global > 2) { | |
c2cf52eb SK |
5243 | btrfs_warn(root->fs_info, |
5244 | "Could not get space for a delete, will truncate on mount %d", | |
5245 | ret); | |
4289a667 JB |
5246 | btrfs_orphan_del(NULL, inode); |
5247 | btrfs_free_block_rsv(root, rsv); | |
5248 | goto no_delete; | |
d68fc57b | 5249 | } |
7b128766 | 5250 | |
0e8c36a9 | 5251 | trans = btrfs_join_transaction(root); |
4289a667 JB |
5252 | if (IS_ERR(trans)) { |
5253 | btrfs_orphan_del(NULL, inode); | |
5254 | btrfs_free_block_rsv(root, rsv); | |
5255 | goto no_delete; | |
d68fc57b | 5256 | } |
7b128766 | 5257 | |
3bce876f JB |
5258 | /* |
5259 | * We can't just steal from the global reserve, we need tomake | |
5260 | * sure there is room to do it, if not we need to commit and try | |
5261 | * again. | |
5262 | */ | |
5263 | if (steal_from_global) { | |
5264 | if (!btrfs_check_space_for_delayed_refs(trans, root)) | |
5265 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, | |
5266 | min_size); | |
5267 | else | |
5268 | ret = -ENOSPC; | |
5269 | } | |
5270 | ||
5271 | /* | |
5272 | * Couldn't steal from the global reserve, we have too much | |
5273 | * pending stuff built up, commit the transaction and try it | |
5274 | * again. | |
5275 | */ | |
5276 | if (ret) { | |
5277 | ret = btrfs_commit_transaction(trans, root); | |
5278 | if (ret) { | |
5279 | btrfs_orphan_del(NULL, inode); | |
5280 | btrfs_free_block_rsv(root, rsv); | |
5281 | goto no_delete; | |
5282 | } | |
5283 | continue; | |
5284 | } else { | |
5285 | steal_from_global = 0; | |
5286 | } | |
5287 | ||
4289a667 JB |
5288 | trans->block_rsv = rsv; |
5289 | ||
d68fc57b | 5290 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
28ed1345 | 5291 | if (ret != -ENOSPC && ret != -EAGAIN) |
8082510e | 5292 | break; |
85e21bac | 5293 | |
8407aa46 | 5294 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e YZ |
5295 | btrfs_end_transaction(trans, root); |
5296 | trans = NULL; | |
b53d3f5d | 5297 | btrfs_btree_balance_dirty(root); |
8082510e | 5298 | } |
5f39d397 | 5299 | |
4289a667 JB |
5300 | btrfs_free_block_rsv(root, rsv); |
5301 | ||
4ef31a45 JB |
5302 | /* |
5303 | * Errors here aren't a big deal, it just means we leave orphan items | |
5304 | * in the tree. They will be cleaned up on the next mount. | |
5305 | */ | |
8082510e | 5306 | if (ret == 0) { |
4289a667 | 5307 | trans->block_rsv = root->orphan_block_rsv; |
4ef31a45 JB |
5308 | btrfs_orphan_del(trans, inode); |
5309 | } else { | |
5310 | btrfs_orphan_del(NULL, inode); | |
8082510e | 5311 | } |
54aa1f4d | 5312 | |
4289a667 | 5313 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
581bb050 LZ |
5314 | if (!(root == root->fs_info->tree_root || |
5315 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) | |
33345d01 | 5316 | btrfs_return_ino(root, btrfs_ino(inode)); |
581bb050 | 5317 | |
54aa1f4d | 5318 | btrfs_end_transaction(trans, root); |
b53d3f5d | 5319 | btrfs_btree_balance_dirty(root); |
39279cc3 | 5320 | no_delete: |
89042e5a | 5321 | btrfs_remove_delayed_node(inode); |
dbd5768f | 5322 | clear_inode(inode); |
8082510e | 5323 | return; |
39279cc3 CM |
5324 | } |
5325 | ||
5326 | /* | |
5327 | * this returns the key found in the dir entry in the location pointer. | |
5328 | * If no dir entries were found, location->objectid is 0. | |
5329 | */ | |
5330 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
5331 | struct btrfs_key *location) | |
5332 | { | |
5333 | const char *name = dentry->d_name.name; | |
5334 | int namelen = dentry->d_name.len; | |
5335 | struct btrfs_dir_item *di; | |
5336 | struct btrfs_path *path; | |
5337 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 5338 | int ret = 0; |
39279cc3 CM |
5339 | |
5340 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
5341 | if (!path) |
5342 | return -ENOMEM; | |
3954401f | 5343 | |
33345d01 | 5344 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
39279cc3 | 5345 | namelen, 0); |
0d9f7f3e Y |
5346 | if (IS_ERR(di)) |
5347 | ret = PTR_ERR(di); | |
d397712b | 5348 | |
c704005d | 5349 | if (IS_ERR_OR_NULL(di)) |
3954401f | 5350 | goto out_err; |
d397712b | 5351 | |
5f39d397 | 5352 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 5353 | out: |
39279cc3 CM |
5354 | btrfs_free_path(path); |
5355 | return ret; | |
3954401f CM |
5356 | out_err: |
5357 | location->objectid = 0; | |
5358 | goto out; | |
39279cc3 CM |
5359 | } |
5360 | ||
5361 | /* | |
5362 | * when we hit a tree root in a directory, the btrfs part of the inode | |
5363 | * needs to be changed to reflect the root directory of the tree root. This | |
5364 | * is kind of like crossing a mount point. | |
5365 | */ | |
5366 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
5367 | struct inode *dir, |
5368 | struct dentry *dentry, | |
5369 | struct btrfs_key *location, | |
5370 | struct btrfs_root **sub_root) | |
39279cc3 | 5371 | { |
4df27c4d YZ |
5372 | struct btrfs_path *path; |
5373 | struct btrfs_root *new_root; | |
5374 | struct btrfs_root_ref *ref; | |
5375 | struct extent_buffer *leaf; | |
1d4c08e0 | 5376 | struct btrfs_key key; |
4df27c4d YZ |
5377 | int ret; |
5378 | int err = 0; | |
39279cc3 | 5379 | |
4df27c4d YZ |
5380 | path = btrfs_alloc_path(); |
5381 | if (!path) { | |
5382 | err = -ENOMEM; | |
5383 | goto out; | |
5384 | } | |
39279cc3 | 5385 | |
4df27c4d | 5386 | err = -ENOENT; |
1d4c08e0 DS |
5387 | key.objectid = BTRFS_I(dir)->root->root_key.objectid; |
5388 | key.type = BTRFS_ROOT_REF_KEY; | |
5389 | key.offset = location->objectid; | |
5390 | ||
5391 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, &key, path, | |
5392 | 0, 0); | |
4df27c4d YZ |
5393 | if (ret) { |
5394 | if (ret < 0) | |
5395 | err = ret; | |
5396 | goto out; | |
5397 | } | |
39279cc3 | 5398 | |
4df27c4d YZ |
5399 | leaf = path->nodes[0]; |
5400 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
33345d01 | 5401 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
4df27c4d YZ |
5402 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
5403 | goto out; | |
39279cc3 | 5404 | |
4df27c4d YZ |
5405 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
5406 | (unsigned long)(ref + 1), | |
5407 | dentry->d_name.len); | |
5408 | if (ret) | |
5409 | goto out; | |
5410 | ||
b3b4aa74 | 5411 | btrfs_release_path(path); |
4df27c4d YZ |
5412 | |
5413 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
5414 | if (IS_ERR(new_root)) { | |
5415 | err = PTR_ERR(new_root); | |
5416 | goto out; | |
5417 | } | |
5418 | ||
4df27c4d YZ |
5419 | *sub_root = new_root; |
5420 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
5421 | location->type = BTRFS_INODE_ITEM_KEY; | |
5422 | location->offset = 0; | |
5423 | err = 0; | |
5424 | out: | |
5425 | btrfs_free_path(path); | |
5426 | return err; | |
39279cc3 CM |
5427 | } |
5428 | ||
5d4f98a2 YZ |
5429 | static void inode_tree_add(struct inode *inode) |
5430 | { | |
5431 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5432 | struct btrfs_inode *entry; | |
03e860bd FNP |
5433 | struct rb_node **p; |
5434 | struct rb_node *parent; | |
cef21937 | 5435 | struct rb_node *new = &BTRFS_I(inode)->rb_node; |
33345d01 | 5436 | u64 ino = btrfs_ino(inode); |
5d4f98a2 | 5437 | |
1d3382cb | 5438 | if (inode_unhashed(inode)) |
76dda93c | 5439 | return; |
e1409cef | 5440 | parent = NULL; |
5d4f98a2 | 5441 | spin_lock(&root->inode_lock); |
e1409cef | 5442 | p = &root->inode_tree.rb_node; |
5d4f98a2 YZ |
5443 | while (*p) { |
5444 | parent = *p; | |
5445 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
5446 | ||
33345d01 | 5447 | if (ino < btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5448 | p = &parent->rb_left; |
33345d01 | 5449 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
03e860bd | 5450 | p = &parent->rb_right; |
5d4f98a2 YZ |
5451 | else { |
5452 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 5453 | (I_WILL_FREE | I_FREEING))); |
cef21937 | 5454 | rb_replace_node(parent, new, &root->inode_tree); |
03e860bd FNP |
5455 | RB_CLEAR_NODE(parent); |
5456 | spin_unlock(&root->inode_lock); | |
cef21937 | 5457 | return; |
5d4f98a2 YZ |
5458 | } |
5459 | } | |
cef21937 FDBM |
5460 | rb_link_node(new, parent, p); |
5461 | rb_insert_color(new, &root->inode_tree); | |
5d4f98a2 YZ |
5462 | spin_unlock(&root->inode_lock); |
5463 | } | |
5464 | ||
5465 | static void inode_tree_del(struct inode *inode) | |
5466 | { | |
5467 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 5468 | int empty = 0; |
5d4f98a2 | 5469 | |
03e860bd | 5470 | spin_lock(&root->inode_lock); |
5d4f98a2 | 5471 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 5472 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 5473 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 5474 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 5475 | } |
03e860bd | 5476 | spin_unlock(&root->inode_lock); |
76dda93c | 5477 | |
69e9c6c6 | 5478 | if (empty && btrfs_root_refs(&root->root_item) == 0) { |
76dda93c YZ |
5479 | synchronize_srcu(&root->fs_info->subvol_srcu); |
5480 | spin_lock(&root->inode_lock); | |
5481 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
5482 | spin_unlock(&root->inode_lock); | |
5483 | if (empty) | |
5484 | btrfs_add_dead_root(root); | |
5485 | } | |
5486 | } | |
5487 | ||
143bede5 | 5488 | void btrfs_invalidate_inodes(struct btrfs_root *root) |
76dda93c YZ |
5489 | { |
5490 | struct rb_node *node; | |
5491 | struct rb_node *prev; | |
5492 | struct btrfs_inode *entry; | |
5493 | struct inode *inode; | |
5494 | u64 objectid = 0; | |
5495 | ||
7813b3db LB |
5496 | if (!test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
5497 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
76dda93c YZ |
5498 | |
5499 | spin_lock(&root->inode_lock); | |
5500 | again: | |
5501 | node = root->inode_tree.rb_node; | |
5502 | prev = NULL; | |
5503 | while (node) { | |
5504 | prev = node; | |
5505 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
5506 | ||
33345d01 | 5507 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
76dda93c | 5508 | node = node->rb_left; |
33345d01 | 5509 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
76dda93c YZ |
5510 | node = node->rb_right; |
5511 | else | |
5512 | break; | |
5513 | } | |
5514 | if (!node) { | |
5515 | while (prev) { | |
5516 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 5517 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
76dda93c YZ |
5518 | node = prev; |
5519 | break; | |
5520 | } | |
5521 | prev = rb_next(prev); | |
5522 | } | |
5523 | } | |
5524 | while (node) { | |
5525 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
33345d01 | 5526 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
76dda93c YZ |
5527 | inode = igrab(&entry->vfs_inode); |
5528 | if (inode) { | |
5529 | spin_unlock(&root->inode_lock); | |
5530 | if (atomic_read(&inode->i_count) > 1) | |
5531 | d_prune_aliases(inode); | |
5532 | /* | |
45321ac5 | 5533 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
5534 | * the inode cache when its usage count |
5535 | * hits zero. | |
5536 | */ | |
5537 | iput(inode); | |
5538 | cond_resched(); | |
5539 | spin_lock(&root->inode_lock); | |
5540 | goto again; | |
5541 | } | |
5542 | ||
5543 | if (cond_resched_lock(&root->inode_lock)) | |
5544 | goto again; | |
5545 | ||
5546 | node = rb_next(node); | |
5547 | } | |
5548 | spin_unlock(&root->inode_lock); | |
5d4f98a2 YZ |
5549 | } |
5550 | ||
e02119d5 CM |
5551 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
5552 | { | |
5553 | struct btrfs_iget_args *args = p; | |
90d3e592 CM |
5554 | inode->i_ino = args->location->objectid; |
5555 | memcpy(&BTRFS_I(inode)->location, args->location, | |
5556 | sizeof(*args->location)); | |
e02119d5 | 5557 | BTRFS_I(inode)->root = args->root; |
39279cc3 CM |
5558 | return 0; |
5559 | } | |
5560 | ||
5561 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
5562 | { | |
5563 | struct btrfs_iget_args *args = opaque; | |
90d3e592 | 5564 | return args->location->objectid == BTRFS_I(inode)->location.objectid && |
d397712b | 5565 | args->root == BTRFS_I(inode)->root; |
39279cc3 CM |
5566 | } |
5567 | ||
5d4f98a2 | 5568 | static struct inode *btrfs_iget_locked(struct super_block *s, |
90d3e592 | 5569 | struct btrfs_key *location, |
5d4f98a2 | 5570 | struct btrfs_root *root) |
39279cc3 CM |
5571 | { |
5572 | struct inode *inode; | |
5573 | struct btrfs_iget_args args; | |
90d3e592 | 5574 | unsigned long hashval = btrfs_inode_hash(location->objectid, root); |
778ba82b | 5575 | |
90d3e592 | 5576 | args.location = location; |
39279cc3 CM |
5577 | args.root = root; |
5578 | ||
778ba82b | 5579 | inode = iget5_locked(s, hashval, btrfs_find_actor, |
39279cc3 CM |
5580 | btrfs_init_locked_inode, |
5581 | (void *)&args); | |
5582 | return inode; | |
5583 | } | |
5584 | ||
1a54ef8c BR |
5585 | /* Get an inode object given its location and corresponding root. |
5586 | * Returns in *is_new if the inode was read from disk | |
5587 | */ | |
5588 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 5589 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
5590 | { |
5591 | struct inode *inode; | |
5592 | ||
90d3e592 | 5593 | inode = btrfs_iget_locked(s, location, root); |
1a54ef8c | 5594 | if (!inode) |
5d4f98a2 | 5595 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
5596 | |
5597 | if (inode->i_state & I_NEW) { | |
1a54ef8c | 5598 | btrfs_read_locked_inode(inode); |
1748f843 MF |
5599 | if (!is_bad_inode(inode)) { |
5600 | inode_tree_add(inode); | |
5601 | unlock_new_inode(inode); | |
5602 | if (new) | |
5603 | *new = 1; | |
5604 | } else { | |
e0b6d65b ST |
5605 | unlock_new_inode(inode); |
5606 | iput(inode); | |
5607 | inode = ERR_PTR(-ESTALE); | |
1748f843 MF |
5608 | } |
5609 | } | |
5610 | ||
1a54ef8c BR |
5611 | return inode; |
5612 | } | |
5613 | ||
4df27c4d YZ |
5614 | static struct inode *new_simple_dir(struct super_block *s, |
5615 | struct btrfs_key *key, | |
5616 | struct btrfs_root *root) | |
5617 | { | |
5618 | struct inode *inode = new_inode(s); | |
5619 | ||
5620 | if (!inode) | |
5621 | return ERR_PTR(-ENOMEM); | |
5622 | ||
4df27c4d YZ |
5623 | BTRFS_I(inode)->root = root; |
5624 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
72ac3c0d | 5625 | set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); |
4df27c4d YZ |
5626 | |
5627 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
848cce0d | 5628 | inode->i_op = &btrfs_dir_ro_inode_operations; |
4df27c4d YZ |
5629 | inode->i_fop = &simple_dir_operations; |
5630 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
9cc97d64 | 5631 | inode->i_mtime = CURRENT_TIME; |
5632 | inode->i_atime = inode->i_mtime; | |
5633 | inode->i_ctime = inode->i_mtime; | |
5634 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
4df27c4d YZ |
5635 | |
5636 | return inode; | |
5637 | } | |
5638 | ||
3de4586c | 5639 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 5640 | { |
d397712b | 5641 | struct inode *inode; |
4df27c4d | 5642 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
5643 | struct btrfs_root *sub_root = root; |
5644 | struct btrfs_key location; | |
76dda93c | 5645 | int index; |
b4aff1f8 | 5646 | int ret = 0; |
39279cc3 CM |
5647 | |
5648 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
5649 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 5650 | |
39e3c955 | 5651 | ret = btrfs_inode_by_name(dir, dentry, &location); |
39279cc3 CM |
5652 | if (ret < 0) |
5653 | return ERR_PTR(ret); | |
5f39d397 | 5654 | |
4df27c4d | 5655 | if (location.objectid == 0) |
5662344b | 5656 | return ERR_PTR(-ENOENT); |
4df27c4d YZ |
5657 | |
5658 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 5659 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
5660 | return inode; |
5661 | } | |
5662 | ||
5663 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
5664 | ||
76dda93c | 5665 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
5666 | ret = fixup_tree_root_location(root, dir, dentry, |
5667 | &location, &sub_root); | |
5668 | if (ret < 0) { | |
5669 | if (ret != -ENOENT) | |
5670 | inode = ERR_PTR(ret); | |
5671 | else | |
5672 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
5673 | } else { | |
73f73415 | 5674 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 5675 | } |
76dda93c YZ |
5676 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
5677 | ||
34d19bad | 5678 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
5679 | down_read(&root->fs_info->cleanup_work_sem); |
5680 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
66b4ffd1 | 5681 | ret = btrfs_orphan_cleanup(sub_root); |
c71bf099 | 5682 | up_read(&root->fs_info->cleanup_work_sem); |
01cd3367 JB |
5683 | if (ret) { |
5684 | iput(inode); | |
66b4ffd1 | 5685 | inode = ERR_PTR(ret); |
01cd3367 | 5686 | } |
c71bf099 YZ |
5687 | } |
5688 | ||
3de4586c CM |
5689 | return inode; |
5690 | } | |
5691 | ||
fe15ce44 | 5692 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
5693 | { |
5694 | struct btrfs_root *root; | |
2b0143b5 | 5695 | struct inode *inode = d_inode(dentry); |
76dda93c | 5696 | |
848cce0d | 5697 | if (!inode && !IS_ROOT(dentry)) |
2b0143b5 | 5698 | inode = d_inode(dentry->d_parent); |
76dda93c | 5699 | |
848cce0d LZ |
5700 | if (inode) { |
5701 | root = BTRFS_I(inode)->root; | |
efefb143 YZ |
5702 | if (btrfs_root_refs(&root->root_item) == 0) |
5703 | return 1; | |
848cce0d LZ |
5704 | |
5705 | if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) | |
5706 | return 1; | |
efefb143 | 5707 | } |
76dda93c YZ |
5708 | return 0; |
5709 | } | |
5710 | ||
b4aff1f8 JB |
5711 | static void btrfs_dentry_release(struct dentry *dentry) |
5712 | { | |
944a4515 | 5713 | kfree(dentry->d_fsdata); |
b4aff1f8 JB |
5714 | } |
5715 | ||
3de4586c | 5716 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 5717 | unsigned int flags) |
3de4586c | 5718 | { |
5662344b | 5719 | struct inode *inode; |
a66e7cc6 | 5720 | |
5662344b TI |
5721 | inode = btrfs_lookup_dentry(dir, dentry); |
5722 | if (IS_ERR(inode)) { | |
5723 | if (PTR_ERR(inode) == -ENOENT) | |
5724 | inode = NULL; | |
5725 | else | |
5726 | return ERR_CAST(inode); | |
5727 | } | |
5728 | ||
41d28bca | 5729 | return d_splice_alias(inode, dentry); |
39279cc3 CM |
5730 | } |
5731 | ||
16cdcec7 | 5732 | unsigned char btrfs_filetype_table[] = { |
39279cc3 CM |
5733 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
5734 | }; | |
5735 | ||
9cdda8d3 | 5736 | static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) |
39279cc3 | 5737 | { |
9cdda8d3 | 5738 | struct inode *inode = file_inode(file); |
39279cc3 CM |
5739 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5740 | struct btrfs_item *item; | |
5741 | struct btrfs_dir_item *di; | |
5742 | struct btrfs_key key; | |
5f39d397 | 5743 | struct btrfs_key found_key; |
39279cc3 | 5744 | struct btrfs_path *path; |
16cdcec7 MX |
5745 | struct list_head ins_list; |
5746 | struct list_head del_list; | |
39279cc3 | 5747 | int ret; |
5f39d397 | 5748 | struct extent_buffer *leaf; |
39279cc3 | 5749 | int slot; |
39279cc3 CM |
5750 | unsigned char d_type; |
5751 | int over = 0; | |
5752 | u32 di_cur; | |
5753 | u32 di_total; | |
5754 | u32 di_len; | |
5755 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
5756 | char tmp_name[32]; |
5757 | char *name_ptr; | |
5758 | int name_len; | |
9cdda8d3 | 5759 | int is_curr = 0; /* ctx->pos points to the current index? */ |
39279cc3 CM |
5760 | |
5761 | /* FIXME, use a real flag for deciding about the key type */ | |
5762 | if (root->fs_info->tree_root == root) | |
5763 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 5764 | |
9cdda8d3 AV |
5765 | if (!dir_emit_dots(file, ctx)) |
5766 | return 0; | |
5767 | ||
49593bfa | 5768 | path = btrfs_alloc_path(); |
16cdcec7 MX |
5769 | if (!path) |
5770 | return -ENOMEM; | |
ff5714cc | 5771 | |
026fd317 | 5772 | path->reada = 1; |
49593bfa | 5773 | |
16cdcec7 MX |
5774 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5775 | INIT_LIST_HEAD(&ins_list); | |
5776 | INIT_LIST_HEAD(&del_list); | |
5777 | btrfs_get_delayed_items(inode, &ins_list, &del_list); | |
5778 | } | |
5779 | ||
962a298f | 5780 | key.type = key_type; |
9cdda8d3 | 5781 | key.offset = ctx->pos; |
33345d01 | 5782 | key.objectid = btrfs_ino(inode); |
5f39d397 | 5783 | |
39279cc3 CM |
5784 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
5785 | if (ret < 0) | |
5786 | goto err; | |
49593bfa DW |
5787 | |
5788 | while (1) { | |
5f39d397 | 5789 | leaf = path->nodes[0]; |
39279cc3 | 5790 | slot = path->slots[0]; |
b9e03af0 LZ |
5791 | if (slot >= btrfs_header_nritems(leaf)) { |
5792 | ret = btrfs_next_leaf(root, path); | |
5793 | if (ret < 0) | |
5794 | goto err; | |
5795 | else if (ret > 0) | |
5796 | break; | |
5797 | continue; | |
39279cc3 | 5798 | } |
3de4586c | 5799 | |
dd3cc16b | 5800 | item = btrfs_item_nr(slot); |
5f39d397 CM |
5801 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
5802 | ||
5803 | if (found_key.objectid != key.objectid) | |
39279cc3 | 5804 | break; |
962a298f | 5805 | if (found_key.type != key_type) |
39279cc3 | 5806 | break; |
9cdda8d3 | 5807 | if (found_key.offset < ctx->pos) |
b9e03af0 | 5808 | goto next; |
16cdcec7 MX |
5809 | if (key_type == BTRFS_DIR_INDEX_KEY && |
5810 | btrfs_should_delete_dir_index(&del_list, | |
5811 | found_key.offset)) | |
5812 | goto next; | |
5f39d397 | 5813 | |
9cdda8d3 | 5814 | ctx->pos = found_key.offset; |
16cdcec7 | 5815 | is_curr = 1; |
49593bfa | 5816 | |
39279cc3 CM |
5817 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
5818 | di_cur = 0; | |
5f39d397 | 5819 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
5820 | |
5821 | while (di_cur < di_total) { | |
5f39d397 CM |
5822 | struct btrfs_key location; |
5823 | ||
22a94d44 JB |
5824 | if (verify_dir_item(root, leaf, di)) |
5825 | break; | |
5826 | ||
5f39d397 | 5827 | name_len = btrfs_dir_name_len(leaf, di); |
49593bfa | 5828 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
5829 | name_ptr = tmp_name; |
5830 | } else { | |
5831 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
5832 | if (!name_ptr) { |
5833 | ret = -ENOMEM; | |
5834 | goto err; | |
5835 | } | |
5f39d397 CM |
5836 | } |
5837 | read_extent_buffer(leaf, name_ptr, | |
5838 | (unsigned long)(di + 1), name_len); | |
5839 | ||
5840 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
5841 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c | 5842 | |
fede766f | 5843 | |
3de4586c | 5844 | /* is this a reference to our own snapshot? If so |
8c9c2bf7 AJ |
5845 | * skip it. |
5846 | * | |
5847 | * In contrast to old kernels, we insert the snapshot's | |
5848 | * dir item and dir index after it has been created, so | |
5849 | * we won't find a reference to our own snapshot. We | |
5850 | * still keep the following code for backward | |
5851 | * compatibility. | |
3de4586c CM |
5852 | */ |
5853 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
5854 | location.objectid == root->root_key.objectid) { | |
5855 | over = 0; | |
5856 | goto skip; | |
5857 | } | |
9cdda8d3 AV |
5858 | over = !dir_emit(ctx, name_ptr, name_len, |
5859 | location.objectid, d_type); | |
5f39d397 | 5860 | |
3de4586c | 5861 | skip: |
5f39d397 CM |
5862 | if (name_ptr != tmp_name) |
5863 | kfree(name_ptr); | |
5864 | ||
39279cc3 CM |
5865 | if (over) |
5866 | goto nopos; | |
5103e947 | 5867 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 5868 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
5869 | di_cur += di_len; |
5870 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
5871 | } | |
b9e03af0 LZ |
5872 | next: |
5873 | path->slots[0]++; | |
39279cc3 | 5874 | } |
49593bfa | 5875 | |
16cdcec7 MX |
5876 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
5877 | if (is_curr) | |
9cdda8d3 AV |
5878 | ctx->pos++; |
5879 | ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list); | |
16cdcec7 MX |
5880 | if (ret) |
5881 | goto nopos; | |
5882 | } | |
5883 | ||
49593bfa | 5884 | /* Reached end of directory/root. Bump pos past the last item. */ |
db62efbb ZB |
5885 | ctx->pos++; |
5886 | ||
5887 | /* | |
5888 | * Stop new entries from being returned after we return the last | |
5889 | * entry. | |
5890 | * | |
5891 | * New directory entries are assigned a strictly increasing | |
5892 | * offset. This means that new entries created during readdir | |
5893 | * are *guaranteed* to be seen in the future by that readdir. | |
5894 | * This has broken buggy programs which operate on names as | |
5895 | * they're returned by readdir. Until we re-use freed offsets | |
5896 | * we have this hack to stop new entries from being returned | |
5897 | * under the assumption that they'll never reach this huge | |
5898 | * offset. | |
5899 | * | |
5900 | * This is being careful not to overflow 32bit loff_t unless the | |
5901 | * last entry requires it because doing so has broken 32bit apps | |
5902 | * in the past. | |
5903 | */ | |
5904 | if (key_type == BTRFS_DIR_INDEX_KEY) { | |
5905 | if (ctx->pos >= INT_MAX) | |
5906 | ctx->pos = LLONG_MAX; | |
5907 | else | |
5908 | ctx->pos = INT_MAX; | |
5909 | } | |
39279cc3 CM |
5910 | nopos: |
5911 | ret = 0; | |
5912 | err: | |
16cdcec7 MX |
5913 | if (key_type == BTRFS_DIR_INDEX_KEY) |
5914 | btrfs_put_delayed_items(&ins_list, &del_list); | |
39279cc3 | 5915 | btrfs_free_path(path); |
39279cc3 CM |
5916 | return ret; |
5917 | } | |
5918 | ||
a9185b41 | 5919 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
5920 | { |
5921 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5922 | struct btrfs_trans_handle *trans; | |
5923 | int ret = 0; | |
0af3d00b | 5924 | bool nolock = false; |
39279cc3 | 5925 | |
72ac3c0d | 5926 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
4ca8b41e CM |
5927 | return 0; |
5928 | ||
83eea1f1 | 5929 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode)) |
82d5902d | 5930 | nolock = true; |
0af3d00b | 5931 | |
a9185b41 | 5932 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b | 5933 | if (nolock) |
7a7eaa40 | 5934 | trans = btrfs_join_transaction_nolock(root); |
0af3d00b | 5935 | else |
7a7eaa40 | 5936 | trans = btrfs_join_transaction(root); |
3612b495 TI |
5937 | if (IS_ERR(trans)) |
5938 | return PTR_ERR(trans); | |
a698d075 | 5939 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 CM |
5940 | } |
5941 | return ret; | |
5942 | } | |
5943 | ||
5944 | /* | |
54aa1f4d | 5945 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
5946 | * inode changes. But, it is most likely to find the inode in cache. |
5947 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
5948 | * to keep or drop this code. | |
5949 | */ | |
48a3b636 | 5950 | static int btrfs_dirty_inode(struct inode *inode) |
39279cc3 CM |
5951 | { |
5952 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5953 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
5954 | int ret; |
5955 | ||
72ac3c0d | 5956 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
22c44fe6 | 5957 | return 0; |
39279cc3 | 5958 | |
7a7eaa40 | 5959 | trans = btrfs_join_transaction(root); |
22c44fe6 JB |
5960 | if (IS_ERR(trans)) |
5961 | return PTR_ERR(trans); | |
8929ecfa YZ |
5962 | |
5963 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
5964 | if (ret && ret == -ENOSPC) { |
5965 | /* whoops, lets try again with the full transaction */ | |
5966 | btrfs_end_transaction(trans, root); | |
5967 | trans = btrfs_start_transaction(root, 1); | |
22c44fe6 JB |
5968 | if (IS_ERR(trans)) |
5969 | return PTR_ERR(trans); | |
8929ecfa | 5970 | |
94b60442 | 5971 | ret = btrfs_update_inode(trans, root, inode); |
94b60442 | 5972 | } |
39279cc3 | 5973 | btrfs_end_transaction(trans, root); |
16cdcec7 MX |
5974 | if (BTRFS_I(inode)->delayed_node) |
5975 | btrfs_balance_delayed_items(root); | |
22c44fe6 JB |
5976 | |
5977 | return ret; | |
5978 | } | |
5979 | ||
5980 | /* | |
5981 | * This is a copy of file_update_time. We need this so we can return error on | |
5982 | * ENOSPC for updating the inode in the case of file write and mmap writes. | |
5983 | */ | |
e41f941a JB |
5984 | static int btrfs_update_time(struct inode *inode, struct timespec *now, |
5985 | int flags) | |
22c44fe6 | 5986 | { |
2bc55652 AB |
5987 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5988 | ||
5989 | if (btrfs_root_readonly(root)) | |
5990 | return -EROFS; | |
5991 | ||
e41f941a | 5992 | if (flags & S_VERSION) |
22c44fe6 | 5993 | inode_inc_iversion(inode); |
e41f941a JB |
5994 | if (flags & S_CTIME) |
5995 | inode->i_ctime = *now; | |
5996 | if (flags & S_MTIME) | |
5997 | inode->i_mtime = *now; | |
5998 | if (flags & S_ATIME) | |
5999 | inode->i_atime = *now; | |
6000 | return btrfs_dirty_inode(inode); | |
39279cc3 CM |
6001 | } |
6002 | ||
d352ac68 CM |
6003 | /* |
6004 | * find the highest existing sequence number in a directory | |
6005 | * and then set the in-memory index_cnt variable to reflect | |
6006 | * free sequence numbers | |
6007 | */ | |
aec7477b JB |
6008 | static int btrfs_set_inode_index_count(struct inode *inode) |
6009 | { | |
6010 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6011 | struct btrfs_key key, found_key; | |
6012 | struct btrfs_path *path; | |
6013 | struct extent_buffer *leaf; | |
6014 | int ret; | |
6015 | ||
33345d01 | 6016 | key.objectid = btrfs_ino(inode); |
962a298f | 6017 | key.type = BTRFS_DIR_INDEX_KEY; |
aec7477b JB |
6018 | key.offset = (u64)-1; |
6019 | ||
6020 | path = btrfs_alloc_path(); | |
6021 | if (!path) | |
6022 | return -ENOMEM; | |
6023 | ||
6024 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
6025 | if (ret < 0) | |
6026 | goto out; | |
6027 | /* FIXME: we should be able to handle this */ | |
6028 | if (ret == 0) | |
6029 | goto out; | |
6030 | ret = 0; | |
6031 | ||
6032 | /* | |
6033 | * MAGIC NUMBER EXPLANATION: | |
6034 | * since we search a directory based on f_pos we have to start at 2 | |
6035 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
6036 | * else has to start at 2 | |
6037 | */ | |
6038 | if (path->slots[0] == 0) { | |
6039 | BTRFS_I(inode)->index_cnt = 2; | |
6040 | goto out; | |
6041 | } | |
6042 | ||
6043 | path->slots[0]--; | |
6044 | ||
6045 | leaf = path->nodes[0]; | |
6046 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
6047 | ||
33345d01 | 6048 | if (found_key.objectid != btrfs_ino(inode) || |
962a298f | 6049 | found_key.type != BTRFS_DIR_INDEX_KEY) { |
aec7477b JB |
6050 | BTRFS_I(inode)->index_cnt = 2; |
6051 | goto out; | |
6052 | } | |
6053 | ||
6054 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
6055 | out: | |
6056 | btrfs_free_path(path); | |
6057 | return ret; | |
6058 | } | |
6059 | ||
d352ac68 CM |
6060 | /* |
6061 | * helper to find a free sequence number in a given directory. This current | |
6062 | * code is very simple, later versions will do smarter things in the btree | |
6063 | */ | |
3de4586c | 6064 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
6065 | { |
6066 | int ret = 0; | |
6067 | ||
6068 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
16cdcec7 MX |
6069 | ret = btrfs_inode_delayed_dir_index_count(dir); |
6070 | if (ret) { | |
6071 | ret = btrfs_set_inode_index_count(dir); | |
6072 | if (ret) | |
6073 | return ret; | |
6074 | } | |
aec7477b JB |
6075 | } |
6076 | ||
00e4e6b3 | 6077 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
6078 | BTRFS_I(dir)->index_cnt++; |
6079 | ||
6080 | return ret; | |
6081 | } | |
6082 | ||
b0d5d10f CM |
6083 | static int btrfs_insert_inode_locked(struct inode *inode) |
6084 | { | |
6085 | struct btrfs_iget_args args; | |
6086 | args.location = &BTRFS_I(inode)->location; | |
6087 | args.root = BTRFS_I(inode)->root; | |
6088 | ||
6089 | return insert_inode_locked4(inode, | |
6090 | btrfs_inode_hash(inode->i_ino, BTRFS_I(inode)->root), | |
6091 | btrfs_find_actor, &args); | |
6092 | } | |
6093 | ||
39279cc3 CM |
6094 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
6095 | struct btrfs_root *root, | |
aec7477b | 6096 | struct inode *dir, |
9c58309d | 6097 | const char *name, int name_len, |
175a4eb7 AV |
6098 | u64 ref_objectid, u64 objectid, |
6099 | umode_t mode, u64 *index) | |
39279cc3 CM |
6100 | { |
6101 | struct inode *inode; | |
5f39d397 | 6102 | struct btrfs_inode_item *inode_item; |
39279cc3 | 6103 | struct btrfs_key *location; |
5f39d397 | 6104 | struct btrfs_path *path; |
9c58309d CM |
6105 | struct btrfs_inode_ref *ref; |
6106 | struct btrfs_key key[2]; | |
6107 | u32 sizes[2]; | |
ef3b9af5 | 6108 | int nitems = name ? 2 : 1; |
9c58309d | 6109 | unsigned long ptr; |
39279cc3 | 6110 | int ret; |
39279cc3 | 6111 | |
5f39d397 | 6112 | path = btrfs_alloc_path(); |
d8926bb3 MF |
6113 | if (!path) |
6114 | return ERR_PTR(-ENOMEM); | |
5f39d397 | 6115 | |
39279cc3 | 6116 | inode = new_inode(root->fs_info->sb); |
8fb27640 YS |
6117 | if (!inode) { |
6118 | btrfs_free_path(path); | |
39279cc3 | 6119 | return ERR_PTR(-ENOMEM); |
8fb27640 | 6120 | } |
39279cc3 | 6121 | |
5762b5c9 FM |
6122 | /* |
6123 | * O_TMPFILE, set link count to 0, so that after this point, | |
6124 | * we fill in an inode item with the correct link count. | |
6125 | */ | |
6126 | if (!name) | |
6127 | set_nlink(inode, 0); | |
6128 | ||
581bb050 LZ |
6129 | /* |
6130 | * we have to initialize this early, so we can reclaim the inode | |
6131 | * number if we fail afterwards in this function. | |
6132 | */ | |
6133 | inode->i_ino = objectid; | |
6134 | ||
ef3b9af5 | 6135 | if (dir && name) { |
1abe9b8a | 6136 | trace_btrfs_inode_request(dir); |
6137 | ||
3de4586c | 6138 | ret = btrfs_set_inode_index(dir, index); |
09771430 | 6139 | if (ret) { |
8fb27640 | 6140 | btrfs_free_path(path); |
09771430 | 6141 | iput(inode); |
aec7477b | 6142 | return ERR_PTR(ret); |
09771430 | 6143 | } |
ef3b9af5 FM |
6144 | } else if (dir) { |
6145 | *index = 0; | |
aec7477b JB |
6146 | } |
6147 | /* | |
6148 | * index_cnt is ignored for everything but a dir, | |
6149 | * btrfs_get_inode_index_count has an explanation for the magic | |
6150 | * number | |
6151 | */ | |
6152 | BTRFS_I(inode)->index_cnt = 2; | |
67de1176 | 6153 | BTRFS_I(inode)->dir_index = *index; |
39279cc3 | 6154 | BTRFS_I(inode)->root = root; |
e02119d5 | 6155 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 6156 | inode->i_generation = BTRFS_I(inode)->generation; |
b888db2b | 6157 | |
5dc562c5 JB |
6158 | /* |
6159 | * We could have gotten an inode number from somebody who was fsynced | |
6160 | * and then removed in this same transaction, so let's just set full | |
6161 | * sync since it will be a full sync anyway and this will blow away the | |
6162 | * old info in the log. | |
6163 | */ | |
6164 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
6165 | ||
9c58309d | 6166 | key[0].objectid = objectid; |
962a298f | 6167 | key[0].type = BTRFS_INODE_ITEM_KEY; |
9c58309d CM |
6168 | key[0].offset = 0; |
6169 | ||
9c58309d | 6170 | sizes[0] = sizeof(struct btrfs_inode_item); |
ef3b9af5 FM |
6171 | |
6172 | if (name) { | |
6173 | /* | |
6174 | * Start new inodes with an inode_ref. This is slightly more | |
6175 | * efficient for small numbers of hard links since they will | |
6176 | * be packed into one item. Extended refs will kick in if we | |
6177 | * add more hard links than can fit in the ref item. | |
6178 | */ | |
6179 | key[1].objectid = objectid; | |
962a298f | 6180 | key[1].type = BTRFS_INODE_REF_KEY; |
ef3b9af5 FM |
6181 | key[1].offset = ref_objectid; |
6182 | ||
6183 | sizes[1] = name_len + sizeof(*ref); | |
6184 | } | |
9c58309d | 6185 | |
b0d5d10f CM |
6186 | location = &BTRFS_I(inode)->location; |
6187 | location->objectid = objectid; | |
6188 | location->offset = 0; | |
962a298f | 6189 | location->type = BTRFS_INODE_ITEM_KEY; |
b0d5d10f CM |
6190 | |
6191 | ret = btrfs_insert_inode_locked(inode); | |
6192 | if (ret < 0) | |
6193 | goto fail; | |
6194 | ||
b9473439 | 6195 | path->leave_spinning = 1; |
ef3b9af5 | 6196 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems); |
9c58309d | 6197 | if (ret != 0) |
b0d5d10f | 6198 | goto fail_unlock; |
5f39d397 | 6199 | |
ecc11fab | 6200 | inode_init_owner(inode, dir, mode); |
a76a3cd4 | 6201 | inode_set_bytes(inode, 0); |
9cc97d64 | 6202 | |
6203 | inode->i_mtime = CURRENT_TIME; | |
6204 | inode->i_atime = inode->i_mtime; | |
6205 | inode->i_ctime = inode->i_mtime; | |
6206 | BTRFS_I(inode)->i_otime = inode->i_mtime; | |
6207 | ||
5f39d397 CM |
6208 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
6209 | struct btrfs_inode_item); | |
293f7e07 LZ |
6210 | memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item, |
6211 | sizeof(*inode_item)); | |
e02119d5 | 6212 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d | 6213 | |
ef3b9af5 FM |
6214 | if (name) { |
6215 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
6216 | struct btrfs_inode_ref); | |
6217 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
6218 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); | |
6219 | ptr = (unsigned long)(ref + 1); | |
6220 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
6221 | } | |
9c58309d | 6222 | |
5f39d397 CM |
6223 | btrfs_mark_buffer_dirty(path->nodes[0]); |
6224 | btrfs_free_path(path); | |
6225 | ||
6cbff00f CH |
6226 | btrfs_inherit_iflags(inode, dir); |
6227 | ||
569254b0 | 6228 | if (S_ISREG(mode)) { |
94272164 CM |
6229 | if (btrfs_test_opt(root, NODATASUM)) |
6230 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
213490b3 | 6231 | if (btrfs_test_opt(root, NODATACOW)) |
f2bdf9a8 JB |
6232 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW | |
6233 | BTRFS_INODE_NODATASUM; | |
94272164 CM |
6234 | } |
6235 | ||
5d4f98a2 | 6236 | inode_tree_add(inode); |
1abe9b8a | 6237 | |
6238 | trace_btrfs_inode_new(inode); | |
1973f0fa | 6239 | btrfs_set_inode_last_trans(trans, inode); |
1abe9b8a | 6240 | |
8ea05e3a AB |
6241 | btrfs_update_root_times(trans, root); |
6242 | ||
63541927 FDBM |
6243 | ret = btrfs_inode_inherit_props(trans, inode, dir); |
6244 | if (ret) | |
6245 | btrfs_err(root->fs_info, | |
6246 | "error inheriting props for ino %llu (root %llu): %d", | |
6247 | btrfs_ino(inode), root->root_key.objectid, ret); | |
6248 | ||
39279cc3 | 6249 | return inode; |
b0d5d10f CM |
6250 | |
6251 | fail_unlock: | |
6252 | unlock_new_inode(inode); | |
5f39d397 | 6253 | fail: |
ef3b9af5 | 6254 | if (dir && name) |
aec7477b | 6255 | BTRFS_I(dir)->index_cnt--; |
5f39d397 | 6256 | btrfs_free_path(path); |
09771430 | 6257 | iput(inode); |
5f39d397 | 6258 | return ERR_PTR(ret); |
39279cc3 CM |
6259 | } |
6260 | ||
6261 | static inline u8 btrfs_inode_type(struct inode *inode) | |
6262 | { | |
6263 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
6264 | } | |
6265 | ||
d352ac68 CM |
6266 | /* |
6267 | * utility function to add 'inode' into 'parent_inode' with | |
6268 | * a give name and a given sequence number. | |
6269 | * if 'add_backref' is true, also insert a backref from the | |
6270 | * inode to the parent directory. | |
6271 | */ | |
e02119d5 CM |
6272 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
6273 | struct inode *parent_inode, struct inode *inode, | |
6274 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 6275 | { |
4df27c4d | 6276 | int ret = 0; |
39279cc3 | 6277 | struct btrfs_key key; |
e02119d5 | 6278 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
33345d01 LZ |
6279 | u64 ino = btrfs_ino(inode); |
6280 | u64 parent_ino = btrfs_ino(parent_inode); | |
5f39d397 | 6281 | |
33345d01 | 6282 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6283 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
6284 | } else { | |
33345d01 | 6285 | key.objectid = ino; |
962a298f | 6286 | key.type = BTRFS_INODE_ITEM_KEY; |
4df27c4d YZ |
6287 | key.offset = 0; |
6288 | } | |
6289 | ||
33345d01 | 6290 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
6291 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
6292 | key.objectid, root->root_key.objectid, | |
33345d01 | 6293 | parent_ino, index, name, name_len); |
4df27c4d | 6294 | } else if (add_backref) { |
33345d01 LZ |
6295 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
6296 | parent_ino, index); | |
4df27c4d | 6297 | } |
39279cc3 | 6298 | |
79787eaa JM |
6299 | /* Nothing to clean up yet */ |
6300 | if (ret) | |
6301 | return ret; | |
4df27c4d | 6302 | |
79787eaa JM |
6303 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
6304 | parent_inode, &key, | |
6305 | btrfs_inode_type(inode), index); | |
9c52057c | 6306 | if (ret == -EEXIST || ret == -EOVERFLOW) |
79787eaa JM |
6307 | goto fail_dir_item; |
6308 | else if (ret) { | |
6309 | btrfs_abort_transaction(trans, root, ret); | |
6310 | return ret; | |
39279cc3 | 6311 | } |
79787eaa JM |
6312 | |
6313 | btrfs_i_size_write(parent_inode, parent_inode->i_size + | |
6314 | name_len * 2); | |
0c4d2d95 | 6315 | inode_inc_iversion(parent_inode); |
79787eaa JM |
6316 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
6317 | ret = btrfs_update_inode(trans, root, parent_inode); | |
6318 | if (ret) | |
6319 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 6320 | return ret; |
fe66a05a CM |
6321 | |
6322 | fail_dir_item: | |
6323 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
6324 | u64 local_index; | |
6325 | int err; | |
6326 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
6327 | key.objectid, root->root_key.objectid, | |
6328 | parent_ino, &local_index, name, name_len); | |
6329 | ||
6330 | } else if (add_backref) { | |
6331 | u64 local_index; | |
6332 | int err; | |
6333 | ||
6334 | err = btrfs_del_inode_ref(trans, root, name, name_len, | |
6335 | ino, parent_ino, &local_index); | |
6336 | } | |
6337 | return ret; | |
39279cc3 CM |
6338 | } |
6339 | ||
6340 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
6341 | struct inode *dir, struct dentry *dentry, |
6342 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 6343 | { |
a1b075d2 JB |
6344 | int err = btrfs_add_link(trans, dir, inode, |
6345 | dentry->d_name.name, dentry->d_name.len, | |
6346 | backref, index); | |
39279cc3 CM |
6347 | if (err > 0) |
6348 | err = -EEXIST; | |
6349 | return err; | |
6350 | } | |
6351 | ||
618e21d5 | 6352 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 6353 | umode_t mode, dev_t rdev) |
618e21d5 JB |
6354 | { |
6355 | struct btrfs_trans_handle *trans; | |
6356 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6357 | struct inode *inode = NULL; |
618e21d5 JB |
6358 | int err; |
6359 | int drop_inode = 0; | |
6360 | u64 objectid; | |
00e4e6b3 | 6361 | u64 index = 0; |
618e21d5 JB |
6362 | |
6363 | if (!new_valid_dev(rdev)) | |
6364 | return -EINVAL; | |
6365 | ||
9ed74f2d JB |
6366 | /* |
6367 | * 2 for inode item and ref | |
6368 | * 2 for dir items | |
6369 | * 1 for xattr if selinux is on | |
6370 | */ | |
a22285a6 YZ |
6371 | trans = btrfs_start_transaction(root, 5); |
6372 | if (IS_ERR(trans)) | |
6373 | return PTR_ERR(trans); | |
1832a6d5 | 6374 | |
581bb050 LZ |
6375 | err = btrfs_find_free_ino(root, &objectid); |
6376 | if (err) | |
6377 | goto out_unlock; | |
6378 | ||
aec7477b | 6379 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6380 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6381 | mode, &index); |
7cf96da3 TI |
6382 | if (IS_ERR(inode)) { |
6383 | err = PTR_ERR(inode); | |
618e21d5 | 6384 | goto out_unlock; |
7cf96da3 | 6385 | } |
618e21d5 | 6386 | |
ad19db71 CS |
6387 | /* |
6388 | * If the active LSM wants to access the inode during | |
6389 | * d_instantiate it needs these. Smack checks to see | |
6390 | * if the filesystem supports xattrs by looking at the | |
6391 | * ops vector. | |
6392 | */ | |
ad19db71 | 6393 | inode->i_op = &btrfs_special_inode_operations; |
b0d5d10f CM |
6394 | init_special_inode(inode, inode->i_mode, rdev); |
6395 | ||
6396 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
618e21d5 | 6397 | if (err) |
b0d5d10f CM |
6398 | goto out_unlock_inode; |
6399 | ||
6400 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); | |
6401 | if (err) { | |
6402 | goto out_unlock_inode; | |
6403 | } else { | |
1b4ab1bb | 6404 | btrfs_update_inode(trans, root, inode); |
b0d5d10f | 6405 | unlock_new_inode(inode); |
08c422c2 | 6406 | d_instantiate(dentry, inode); |
618e21d5 | 6407 | } |
b0d5d10f | 6408 | |
618e21d5 | 6409 | out_unlock: |
7ad85bb7 | 6410 | btrfs_end_transaction(trans, root); |
c581afc8 | 6411 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6412 | btrfs_btree_balance_dirty(root); |
618e21d5 JB |
6413 | if (drop_inode) { |
6414 | inode_dec_link_count(inode); | |
6415 | iput(inode); | |
6416 | } | |
618e21d5 | 6417 | return err; |
b0d5d10f CM |
6418 | |
6419 | out_unlock_inode: | |
6420 | drop_inode = 1; | |
6421 | unlock_new_inode(inode); | |
6422 | goto out_unlock; | |
6423 | ||
618e21d5 JB |
6424 | } |
6425 | ||
39279cc3 | 6426 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 6427 | umode_t mode, bool excl) |
39279cc3 CM |
6428 | { |
6429 | struct btrfs_trans_handle *trans; | |
6430 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 6431 | struct inode *inode = NULL; |
43baa579 | 6432 | int drop_inode_on_err = 0; |
a22285a6 | 6433 | int err; |
39279cc3 | 6434 | u64 objectid; |
00e4e6b3 | 6435 | u64 index = 0; |
39279cc3 | 6436 | |
9ed74f2d JB |
6437 | /* |
6438 | * 2 for inode item and ref | |
6439 | * 2 for dir items | |
6440 | * 1 for xattr if selinux is on | |
6441 | */ | |
a22285a6 YZ |
6442 | trans = btrfs_start_transaction(root, 5); |
6443 | if (IS_ERR(trans)) | |
6444 | return PTR_ERR(trans); | |
9ed74f2d | 6445 | |
581bb050 LZ |
6446 | err = btrfs_find_free_ino(root, &objectid); |
6447 | if (err) | |
6448 | goto out_unlock; | |
6449 | ||
aec7477b | 6450 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6451 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6452 | mode, &index); |
7cf96da3 TI |
6453 | if (IS_ERR(inode)) { |
6454 | err = PTR_ERR(inode); | |
39279cc3 | 6455 | goto out_unlock; |
7cf96da3 | 6456 | } |
43baa579 | 6457 | drop_inode_on_err = 1; |
ad19db71 CS |
6458 | /* |
6459 | * If the active LSM wants to access the inode during | |
6460 | * d_instantiate it needs these. Smack checks to see | |
6461 | * if the filesystem supports xattrs by looking at the | |
6462 | * ops vector. | |
6463 | */ | |
6464 | inode->i_fop = &btrfs_file_operations; | |
6465 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 6466 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
6467 | |
6468 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
6469 | if (err) | |
6470 | goto out_unlock_inode; | |
6471 | ||
6472 | err = btrfs_update_inode(trans, root, inode); | |
6473 | if (err) | |
6474 | goto out_unlock_inode; | |
ad19db71 | 6475 | |
a1b075d2 | 6476 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 6477 | if (err) |
b0d5d10f | 6478 | goto out_unlock_inode; |
43baa579 | 6479 | |
43baa579 | 6480 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
b0d5d10f | 6481 | unlock_new_inode(inode); |
43baa579 FB |
6482 | d_instantiate(dentry, inode); |
6483 | ||
39279cc3 | 6484 | out_unlock: |
7ad85bb7 | 6485 | btrfs_end_transaction(trans, root); |
43baa579 | 6486 | if (err && drop_inode_on_err) { |
39279cc3 CM |
6487 | inode_dec_link_count(inode); |
6488 | iput(inode); | |
6489 | } | |
c581afc8 | 6490 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6491 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6492 | return err; |
b0d5d10f CM |
6493 | |
6494 | out_unlock_inode: | |
6495 | unlock_new_inode(inode); | |
6496 | goto out_unlock; | |
6497 | ||
39279cc3 CM |
6498 | } |
6499 | ||
6500 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
6501 | struct dentry *dentry) | |
6502 | { | |
6503 | struct btrfs_trans_handle *trans; | |
6504 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2b0143b5 | 6505 | struct inode *inode = d_inode(old_dentry); |
00e4e6b3 | 6506 | u64 index; |
39279cc3 CM |
6507 | int err; |
6508 | int drop_inode = 0; | |
6509 | ||
4a8be425 TH |
6510 | /* do not allow sys_link's with other subvols of the same device */ |
6511 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
3ab3564f | 6512 | return -EXDEV; |
4a8be425 | 6513 | |
f186373f | 6514 | if (inode->i_nlink >= BTRFS_LINK_MAX) |
c055e99e | 6515 | return -EMLINK; |
4a8be425 | 6516 | |
3de4586c | 6517 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
6518 | if (err) |
6519 | goto fail; | |
6520 | ||
a22285a6 | 6521 | /* |
7e6b6465 | 6522 | * 2 items for inode and inode ref |
a22285a6 | 6523 | * 2 items for dir items |
7e6b6465 | 6524 | * 1 item for parent inode |
a22285a6 | 6525 | */ |
7e6b6465 | 6526 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
6527 | if (IS_ERR(trans)) { |
6528 | err = PTR_ERR(trans); | |
6529 | goto fail; | |
6530 | } | |
5f39d397 | 6531 | |
67de1176 MX |
6532 | /* There are several dir indexes for this inode, clear the cache. */ |
6533 | BTRFS_I(inode)->dir_index = 0ULL; | |
8b558c5f | 6534 | inc_nlink(inode); |
0c4d2d95 | 6535 | inode_inc_iversion(inode); |
3153495d | 6536 | inode->i_ctime = CURRENT_TIME; |
7de9c6ee | 6537 | ihold(inode); |
e9976151 | 6538 | set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags); |
aec7477b | 6539 | |
a1b075d2 | 6540 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 6541 | |
a5719521 | 6542 | if (err) { |
54aa1f4d | 6543 | drop_inode = 1; |
a5719521 | 6544 | } else { |
10d9f309 | 6545 | struct dentry *parent = dentry->d_parent; |
a5719521 | 6546 | err = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
6547 | if (err) |
6548 | goto fail; | |
ef3b9af5 FM |
6549 | if (inode->i_nlink == 1) { |
6550 | /* | |
6551 | * If new hard link count is 1, it's a file created | |
6552 | * with open(2) O_TMPFILE flag. | |
6553 | */ | |
6554 | err = btrfs_orphan_del(trans, inode); | |
6555 | if (err) | |
6556 | goto fail; | |
6557 | } | |
08c422c2 | 6558 | d_instantiate(dentry, inode); |
6a912213 | 6559 | btrfs_log_new_name(trans, inode, NULL, parent); |
a5719521 | 6560 | } |
39279cc3 | 6561 | |
7ad85bb7 | 6562 | btrfs_end_transaction(trans, root); |
c581afc8 | 6563 | btrfs_balance_delayed_items(root); |
1832a6d5 | 6564 | fail: |
39279cc3 CM |
6565 | if (drop_inode) { |
6566 | inode_dec_link_count(inode); | |
6567 | iput(inode); | |
6568 | } | |
b53d3f5d | 6569 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
6570 | return err; |
6571 | } | |
6572 | ||
18bb1db3 | 6573 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
39279cc3 | 6574 | { |
b9d86667 | 6575 | struct inode *inode = NULL; |
39279cc3 CM |
6576 | struct btrfs_trans_handle *trans; |
6577 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
6578 | int err = 0; | |
6579 | int drop_on_err = 0; | |
b9d86667 | 6580 | u64 objectid = 0; |
00e4e6b3 | 6581 | u64 index = 0; |
39279cc3 | 6582 | |
9ed74f2d JB |
6583 | /* |
6584 | * 2 items for inode and ref | |
6585 | * 2 items for dir items | |
6586 | * 1 for xattr if selinux is on | |
6587 | */ | |
a22285a6 YZ |
6588 | trans = btrfs_start_transaction(root, 5); |
6589 | if (IS_ERR(trans)) | |
6590 | return PTR_ERR(trans); | |
39279cc3 | 6591 | |
581bb050 LZ |
6592 | err = btrfs_find_free_ino(root, &objectid); |
6593 | if (err) | |
6594 | goto out_fail; | |
6595 | ||
aec7477b | 6596 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 6597 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 6598 | S_IFDIR | mode, &index); |
39279cc3 CM |
6599 | if (IS_ERR(inode)) { |
6600 | err = PTR_ERR(inode); | |
6601 | goto out_fail; | |
6602 | } | |
5f39d397 | 6603 | |
39279cc3 | 6604 | drop_on_err = 1; |
b0d5d10f CM |
6605 | /* these must be set before we unlock the inode */ |
6606 | inode->i_op = &btrfs_dir_inode_operations; | |
6607 | inode->i_fop = &btrfs_dir_file_operations; | |
33268eaf | 6608 | |
2a7dba39 | 6609 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf | 6610 | if (err) |
b0d5d10f | 6611 | goto out_fail_inode; |
39279cc3 | 6612 | |
dbe674a9 | 6613 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
6614 | err = btrfs_update_inode(trans, root, inode); |
6615 | if (err) | |
b0d5d10f | 6616 | goto out_fail_inode; |
5f39d397 | 6617 | |
a1b075d2 JB |
6618 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
6619 | dentry->d_name.len, 0, index); | |
39279cc3 | 6620 | if (err) |
b0d5d10f | 6621 | goto out_fail_inode; |
5f39d397 | 6622 | |
39279cc3 | 6623 | d_instantiate(dentry, inode); |
b0d5d10f CM |
6624 | /* |
6625 | * mkdir is special. We're unlocking after we call d_instantiate | |
6626 | * to avoid a race with nfsd calling d_instantiate. | |
6627 | */ | |
6628 | unlock_new_inode(inode); | |
39279cc3 | 6629 | drop_on_err = 0; |
39279cc3 CM |
6630 | |
6631 | out_fail: | |
7ad85bb7 | 6632 | btrfs_end_transaction(trans, root); |
c7cfb8a5 WS |
6633 | if (drop_on_err) { |
6634 | inode_dec_link_count(inode); | |
39279cc3 | 6635 | iput(inode); |
c7cfb8a5 | 6636 | } |
c581afc8 | 6637 | btrfs_balance_delayed_items(root); |
b53d3f5d | 6638 | btrfs_btree_balance_dirty(root); |
39279cc3 | 6639 | return err; |
b0d5d10f CM |
6640 | |
6641 | out_fail_inode: | |
6642 | unlock_new_inode(inode); | |
6643 | goto out_fail; | |
39279cc3 CM |
6644 | } |
6645 | ||
e6c4efd8 QW |
6646 | /* Find next extent map of a given extent map, caller needs to ensure locks */ |
6647 | static struct extent_map *next_extent_map(struct extent_map *em) | |
6648 | { | |
6649 | struct rb_node *next; | |
6650 | ||
6651 | next = rb_next(&em->rb_node); | |
6652 | if (!next) | |
6653 | return NULL; | |
6654 | return container_of(next, struct extent_map, rb_node); | |
6655 | } | |
6656 | ||
6657 | static struct extent_map *prev_extent_map(struct extent_map *em) | |
6658 | { | |
6659 | struct rb_node *prev; | |
6660 | ||
6661 | prev = rb_prev(&em->rb_node); | |
6662 | if (!prev) | |
6663 | return NULL; | |
6664 | return container_of(prev, struct extent_map, rb_node); | |
6665 | } | |
6666 | ||
d352ac68 | 6667 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
e6c4efd8 | 6668 | * the existing extent is the nearest extent to map_start, |
d352ac68 | 6669 | * and an extent that you want to insert, deal with overlap and insert |
e6c4efd8 | 6670 | * the best fitted new extent into the tree. |
d352ac68 | 6671 | */ |
3b951516 CM |
6672 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
6673 | struct extent_map *existing, | |
e6dcd2dc | 6674 | struct extent_map *em, |
51f395ad | 6675 | u64 map_start) |
3b951516 | 6676 | { |
e6c4efd8 QW |
6677 | struct extent_map *prev; |
6678 | struct extent_map *next; | |
6679 | u64 start; | |
6680 | u64 end; | |
3b951516 | 6681 | u64 start_diff; |
3b951516 | 6682 | |
e6dcd2dc | 6683 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
e6c4efd8 QW |
6684 | |
6685 | if (existing->start > map_start) { | |
6686 | next = existing; | |
6687 | prev = prev_extent_map(next); | |
6688 | } else { | |
6689 | prev = existing; | |
6690 | next = next_extent_map(prev); | |
6691 | } | |
6692 | ||
6693 | start = prev ? extent_map_end(prev) : em->start; | |
6694 | start = max_t(u64, start, em->start); | |
6695 | end = next ? next->start : extent_map_end(em); | |
6696 | end = min_t(u64, end, extent_map_end(em)); | |
6697 | start_diff = start - em->start; | |
6698 | em->start = start; | |
6699 | em->len = end - start; | |
c8b97818 CM |
6700 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
6701 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 6702 | em->block_start += start_diff; |
c8b97818 CM |
6703 | em->block_len -= start_diff; |
6704 | } | |
09a2a8f9 | 6705 | return add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6706 | } |
6707 | ||
c8b97818 CM |
6708 | static noinline int uncompress_inline(struct btrfs_path *path, |
6709 | struct inode *inode, struct page *page, | |
6710 | size_t pg_offset, u64 extent_offset, | |
6711 | struct btrfs_file_extent_item *item) | |
6712 | { | |
6713 | int ret; | |
6714 | struct extent_buffer *leaf = path->nodes[0]; | |
6715 | char *tmp; | |
6716 | size_t max_size; | |
6717 | unsigned long inline_size; | |
6718 | unsigned long ptr; | |
261507a0 | 6719 | int compress_type; |
c8b97818 CM |
6720 | |
6721 | WARN_ON(pg_offset != 0); | |
261507a0 | 6722 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
6723 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
6724 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
dd3cc16b | 6725 | btrfs_item_nr(path->slots[0])); |
c8b97818 | 6726 | tmp = kmalloc(inline_size, GFP_NOFS); |
8d413713 TI |
6727 | if (!tmp) |
6728 | return -ENOMEM; | |
c8b97818 CM |
6729 | ptr = btrfs_file_extent_inline_start(item); |
6730 | ||
6731 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
6732 | ||
5b050f04 | 6733 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
6734 | ret = btrfs_decompress(compress_type, tmp, page, |
6735 | extent_offset, inline_size, max_size); | |
c8b97818 | 6736 | kfree(tmp); |
166ae5a4 | 6737 | return ret; |
c8b97818 CM |
6738 | } |
6739 | ||
d352ac68 CM |
6740 | /* |
6741 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
6742 | * the ugly parts come from merging extents from the disk with the in-ram |
6743 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
6744 | * where the in-ram extents might be locked pending data=ordered completion. |
6745 | * | |
6746 | * This also copies inline extents directly into the page. | |
6747 | */ | |
d397712b | 6748 | |
a52d9a80 | 6749 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 6750 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
6751 | int create) |
6752 | { | |
6753 | int ret; | |
6754 | int err = 0; | |
a52d9a80 CM |
6755 | u64 extent_start = 0; |
6756 | u64 extent_end = 0; | |
33345d01 | 6757 | u64 objectid = btrfs_ino(inode); |
a52d9a80 | 6758 | u32 found_type; |
f421950f | 6759 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
6760 | struct btrfs_root *root = BTRFS_I(inode)->root; |
6761 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
6762 | struct extent_buffer *leaf; |
6763 | struct btrfs_key found_key; | |
a52d9a80 CM |
6764 | struct extent_map *em = NULL; |
6765 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 6766 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 6767 | struct btrfs_trans_handle *trans = NULL; |
7ffbb598 | 6768 | const bool new_inline = !page || create; |
a52d9a80 | 6769 | |
a52d9a80 | 6770 | again: |
890871be | 6771 | read_lock(&em_tree->lock); |
d1310b2e | 6772 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
6773 | if (em) |
6774 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 6775 | read_unlock(&em_tree->lock); |
d1310b2e | 6776 | |
a52d9a80 | 6777 | if (em) { |
e1c4b745 CM |
6778 | if (em->start > start || em->start + em->len <= start) |
6779 | free_extent_map(em); | |
6780 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
6781 | free_extent_map(em); |
6782 | else | |
6783 | goto out; | |
a52d9a80 | 6784 | } |
172ddd60 | 6785 | em = alloc_extent_map(); |
a52d9a80 | 6786 | if (!em) { |
d1310b2e CM |
6787 | err = -ENOMEM; |
6788 | goto out; | |
a52d9a80 | 6789 | } |
e6dcd2dc | 6790 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 6791 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 6792 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 6793 | em->len = (u64)-1; |
c8b97818 | 6794 | em->block_len = (u64)-1; |
f421950f CM |
6795 | |
6796 | if (!path) { | |
6797 | path = btrfs_alloc_path(); | |
026fd317 JB |
6798 | if (!path) { |
6799 | err = -ENOMEM; | |
6800 | goto out; | |
6801 | } | |
6802 | /* | |
6803 | * Chances are we'll be called again, so go ahead and do | |
6804 | * readahead | |
6805 | */ | |
6806 | path->reada = 1; | |
f421950f CM |
6807 | } |
6808 | ||
179e29e4 CM |
6809 | ret = btrfs_lookup_file_extent(trans, root, path, |
6810 | objectid, start, trans != NULL); | |
a52d9a80 CM |
6811 | if (ret < 0) { |
6812 | err = ret; | |
6813 | goto out; | |
6814 | } | |
6815 | ||
6816 | if (ret != 0) { | |
6817 | if (path->slots[0] == 0) | |
6818 | goto not_found; | |
6819 | path->slots[0]--; | |
6820 | } | |
6821 | ||
5f39d397 CM |
6822 | leaf = path->nodes[0]; |
6823 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 6824 | struct btrfs_file_extent_item); |
a52d9a80 | 6825 | /* are we inside the extent that was found? */ |
5f39d397 | 6826 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
962a298f | 6827 | found_type = found_key.type; |
5f39d397 | 6828 | if (found_key.objectid != objectid || |
a52d9a80 | 6829 | found_type != BTRFS_EXTENT_DATA_KEY) { |
25a50341 JB |
6830 | /* |
6831 | * If we backup past the first extent we want to move forward | |
6832 | * and see if there is an extent in front of us, otherwise we'll | |
6833 | * say there is a hole for our whole search range which can | |
6834 | * cause problems. | |
6835 | */ | |
6836 | extent_end = start; | |
6837 | goto next; | |
a52d9a80 CM |
6838 | } |
6839 | ||
5f39d397 CM |
6840 | found_type = btrfs_file_extent_type(leaf, item); |
6841 | extent_start = found_key.offset; | |
d899e052 YZ |
6842 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6843 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 6844 | extent_end = extent_start + |
db94535d | 6845 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
6846 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
6847 | size_t size; | |
514ac8ad | 6848 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
fda2832f | 6849 | extent_end = ALIGN(extent_start + size, root->sectorsize); |
9036c102 | 6850 | } |
25a50341 | 6851 | next: |
9036c102 YZ |
6852 | if (start >= extent_end) { |
6853 | path->slots[0]++; | |
6854 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
6855 | ret = btrfs_next_leaf(root, path); | |
6856 | if (ret < 0) { | |
6857 | err = ret; | |
6858 | goto out; | |
a52d9a80 | 6859 | } |
9036c102 YZ |
6860 | if (ret > 0) |
6861 | goto not_found; | |
6862 | leaf = path->nodes[0]; | |
a52d9a80 | 6863 | } |
9036c102 YZ |
6864 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
6865 | if (found_key.objectid != objectid || | |
6866 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
6867 | goto not_found; | |
6868 | if (start + len <= found_key.offset) | |
6869 | goto not_found; | |
e2eca69d WS |
6870 | if (start > found_key.offset) |
6871 | goto next; | |
9036c102 | 6872 | em->start = start; |
70c8a91c | 6873 | em->orig_start = start; |
9036c102 YZ |
6874 | em->len = found_key.offset - start; |
6875 | goto not_found_em; | |
6876 | } | |
6877 | ||
7ffbb598 FM |
6878 | btrfs_extent_item_to_extent_map(inode, path, item, new_inline, em); |
6879 | ||
d899e052 YZ |
6880 | if (found_type == BTRFS_FILE_EXTENT_REG || |
6881 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 CM |
6882 | goto insert; |
6883 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 6884 | unsigned long ptr; |
a52d9a80 | 6885 | char *map; |
3326d1b0 CM |
6886 | size_t size; |
6887 | size_t extent_offset; | |
6888 | size_t copy_size; | |
a52d9a80 | 6889 | |
7ffbb598 | 6890 | if (new_inline) |
689f9346 | 6891 | goto out; |
5f39d397 | 6892 | |
514ac8ad | 6893 | size = btrfs_file_extent_inline_len(leaf, path->slots[0], item); |
9036c102 | 6894 | extent_offset = page_offset(page) + pg_offset - extent_start; |
70dec807 | 6895 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 6896 | size - extent_offset); |
3326d1b0 | 6897 | em->start = extent_start + extent_offset; |
fda2832f | 6898 | em->len = ALIGN(copy_size, root->sectorsize); |
b4939680 | 6899 | em->orig_block_len = em->len; |
70c8a91c | 6900 | em->orig_start = em->start; |
689f9346 | 6901 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 6902 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
6903 | if (btrfs_file_extent_compression(leaf, item) != |
6904 | BTRFS_COMPRESS_NONE) { | |
c8b97818 CM |
6905 | ret = uncompress_inline(path, inode, page, |
6906 | pg_offset, | |
6907 | extent_offset, item); | |
166ae5a4 ZB |
6908 | if (ret) { |
6909 | err = ret; | |
6910 | goto out; | |
6911 | } | |
c8b97818 CM |
6912 | } else { |
6913 | map = kmap(page); | |
6914 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
6915 | copy_size); | |
93c82d57 CM |
6916 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
6917 | memset(map + pg_offset + copy_size, 0, | |
6918 | PAGE_CACHE_SIZE - pg_offset - | |
6919 | copy_size); | |
6920 | } | |
c8b97818 CM |
6921 | kunmap(page); |
6922 | } | |
179e29e4 CM |
6923 | flush_dcache_page(page); |
6924 | } else if (create && PageUptodate(page)) { | |
6bf7e080 | 6925 | BUG(); |
179e29e4 CM |
6926 | if (!trans) { |
6927 | kunmap(page); | |
6928 | free_extent_map(em); | |
6929 | em = NULL; | |
ff5714cc | 6930 | |
b3b4aa74 | 6931 | btrfs_release_path(path); |
7a7eaa40 | 6932 | trans = btrfs_join_transaction(root); |
ff5714cc | 6933 | |
3612b495 TI |
6934 | if (IS_ERR(trans)) |
6935 | return ERR_CAST(trans); | |
179e29e4 CM |
6936 | goto again; |
6937 | } | |
c8b97818 | 6938 | map = kmap(page); |
70dec807 | 6939 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 6940 | copy_size); |
c8b97818 | 6941 | kunmap(page); |
179e29e4 | 6942 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 6943 | } |
d1310b2e | 6944 | set_extent_uptodate(io_tree, em->start, |
507903b8 | 6945 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
a52d9a80 | 6946 | goto insert; |
a52d9a80 CM |
6947 | } |
6948 | not_found: | |
6949 | em->start = start; | |
70c8a91c | 6950 | em->orig_start = start; |
d1310b2e | 6951 | em->len = len; |
a52d9a80 | 6952 | not_found_em: |
5f39d397 | 6953 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 6954 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 | 6955 | insert: |
b3b4aa74 | 6956 | btrfs_release_path(path); |
d1310b2e | 6957 | if (em->start > start || extent_map_end(em) <= start) { |
c2cf52eb | 6958 | btrfs_err(root->fs_info, "bad extent! em: [%llu %llu] passed [%llu %llu]", |
c1c9ff7c | 6959 | em->start, em->len, start, len); |
a52d9a80 CM |
6960 | err = -EIO; |
6961 | goto out; | |
6962 | } | |
d1310b2e CM |
6963 | |
6964 | err = 0; | |
890871be | 6965 | write_lock(&em_tree->lock); |
09a2a8f9 | 6966 | ret = add_extent_mapping(em_tree, em, 0); |
3b951516 CM |
6967 | /* it is possible that someone inserted the extent into the tree |
6968 | * while we had the lock dropped. It is also possible that | |
6969 | * an overlapping map exists in the tree | |
6970 | */ | |
a52d9a80 | 6971 | if (ret == -EEXIST) { |
3b951516 | 6972 | struct extent_map *existing; |
e6dcd2dc CM |
6973 | |
6974 | ret = 0; | |
6975 | ||
e6c4efd8 QW |
6976 | existing = search_extent_mapping(em_tree, start, len); |
6977 | /* | |
6978 | * existing will always be non-NULL, since there must be | |
6979 | * extent causing the -EEXIST. | |
6980 | */ | |
6981 | if (start >= extent_map_end(existing) || | |
32be3a1a | 6982 | start <= existing->start) { |
e6c4efd8 QW |
6983 | /* |
6984 | * The existing extent map is the one nearest to | |
6985 | * the [start, start + len) range which overlaps | |
6986 | */ | |
6987 | err = merge_extent_mapping(em_tree, existing, | |
6988 | em, start); | |
e1c4b745 | 6989 | free_extent_map(existing); |
e6c4efd8 | 6990 | if (err) { |
3b951516 CM |
6991 | free_extent_map(em); |
6992 | em = NULL; | |
6993 | } | |
6994 | } else { | |
6995 | free_extent_map(em); | |
6996 | em = existing; | |
e6dcd2dc | 6997 | err = 0; |
a52d9a80 | 6998 | } |
a52d9a80 | 6999 | } |
890871be | 7000 | write_unlock(&em_tree->lock); |
a52d9a80 | 7001 | out: |
1abe9b8a | 7002 | |
4cd8587c | 7003 | trace_btrfs_get_extent(root, em); |
1abe9b8a | 7004 | |
527afb44 | 7005 | btrfs_free_path(path); |
a52d9a80 CM |
7006 | if (trans) { |
7007 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 7008 | if (!err) |
a52d9a80 CM |
7009 | err = ret; |
7010 | } | |
a52d9a80 CM |
7011 | if (err) { |
7012 | free_extent_map(em); | |
a52d9a80 CM |
7013 | return ERR_PTR(err); |
7014 | } | |
79787eaa | 7015 | BUG_ON(!em); /* Error is always set */ |
a52d9a80 CM |
7016 | return em; |
7017 | } | |
7018 | ||
ec29ed5b CM |
7019 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
7020 | size_t pg_offset, u64 start, u64 len, | |
7021 | int create) | |
7022 | { | |
7023 | struct extent_map *em; | |
7024 | struct extent_map *hole_em = NULL; | |
7025 | u64 range_start = start; | |
7026 | u64 end; | |
7027 | u64 found; | |
7028 | u64 found_end; | |
7029 | int err = 0; | |
7030 | ||
7031 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); | |
7032 | if (IS_ERR(em)) | |
7033 | return em; | |
7034 | if (em) { | |
7035 | /* | |
f9e4fb53 LB |
7036 | * if our em maps to |
7037 | * - a hole or | |
7038 | * - a pre-alloc extent, | |
7039 | * there might actually be delalloc bytes behind it. | |
ec29ed5b | 7040 | */ |
f9e4fb53 LB |
7041 | if (em->block_start != EXTENT_MAP_HOLE && |
7042 | !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
ec29ed5b CM |
7043 | return em; |
7044 | else | |
7045 | hole_em = em; | |
7046 | } | |
7047 | ||
7048 | /* check to see if we've wrapped (len == -1 or similar) */ | |
7049 | end = start + len; | |
7050 | if (end < start) | |
7051 | end = (u64)-1; | |
7052 | else | |
7053 | end -= 1; | |
7054 | ||
7055 | em = NULL; | |
7056 | ||
7057 | /* ok, we didn't find anything, lets look for delalloc */ | |
7058 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, | |
7059 | end, len, EXTENT_DELALLOC, 1); | |
7060 | found_end = range_start + found; | |
7061 | if (found_end < range_start) | |
7062 | found_end = (u64)-1; | |
7063 | ||
7064 | /* | |
7065 | * we didn't find anything useful, return | |
7066 | * the original results from get_extent() | |
7067 | */ | |
7068 | if (range_start > end || found_end <= start) { | |
7069 | em = hole_em; | |
7070 | hole_em = NULL; | |
7071 | goto out; | |
7072 | } | |
7073 | ||
7074 | /* adjust the range_start to make sure it doesn't | |
7075 | * go backwards from the start they passed in | |
7076 | */ | |
67871254 | 7077 | range_start = max(start, range_start); |
ec29ed5b CM |
7078 | found = found_end - range_start; |
7079 | ||
7080 | if (found > 0) { | |
7081 | u64 hole_start = start; | |
7082 | u64 hole_len = len; | |
7083 | ||
172ddd60 | 7084 | em = alloc_extent_map(); |
ec29ed5b CM |
7085 | if (!em) { |
7086 | err = -ENOMEM; | |
7087 | goto out; | |
7088 | } | |
7089 | /* | |
7090 | * when btrfs_get_extent can't find anything it | |
7091 | * returns one huge hole | |
7092 | * | |
7093 | * make sure what it found really fits our range, and | |
7094 | * adjust to make sure it is based on the start from | |
7095 | * the caller | |
7096 | */ | |
7097 | if (hole_em) { | |
7098 | u64 calc_end = extent_map_end(hole_em); | |
7099 | ||
7100 | if (calc_end <= start || (hole_em->start > end)) { | |
7101 | free_extent_map(hole_em); | |
7102 | hole_em = NULL; | |
7103 | } else { | |
7104 | hole_start = max(hole_em->start, start); | |
7105 | hole_len = calc_end - hole_start; | |
7106 | } | |
7107 | } | |
7108 | em->bdev = NULL; | |
7109 | if (hole_em && range_start > hole_start) { | |
7110 | /* our hole starts before our delalloc, so we | |
7111 | * have to return just the parts of the hole | |
7112 | * that go until the delalloc starts | |
7113 | */ | |
7114 | em->len = min(hole_len, | |
7115 | range_start - hole_start); | |
7116 | em->start = hole_start; | |
7117 | em->orig_start = hole_start; | |
7118 | /* | |
7119 | * don't adjust block start at all, | |
7120 | * it is fixed at EXTENT_MAP_HOLE | |
7121 | */ | |
7122 | em->block_start = hole_em->block_start; | |
7123 | em->block_len = hole_len; | |
f9e4fb53 LB |
7124 | if (test_bit(EXTENT_FLAG_PREALLOC, &hole_em->flags)) |
7125 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
ec29ed5b CM |
7126 | } else { |
7127 | em->start = range_start; | |
7128 | em->len = found; | |
7129 | em->orig_start = range_start; | |
7130 | em->block_start = EXTENT_MAP_DELALLOC; | |
7131 | em->block_len = found; | |
7132 | } | |
7133 | } else if (hole_em) { | |
7134 | return hole_em; | |
7135 | } | |
7136 | out: | |
7137 | ||
7138 | free_extent_map(hole_em); | |
7139 | if (err) { | |
7140 | free_extent_map(em); | |
7141 | return ERR_PTR(err); | |
7142 | } | |
7143 | return em; | |
7144 | } | |
7145 | ||
4b46fce2 JB |
7146 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
7147 | u64 start, u64 len) | |
7148 | { | |
7149 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
70c8a91c | 7150 | struct extent_map *em; |
4b46fce2 JB |
7151 | struct btrfs_key ins; |
7152 | u64 alloc_hint; | |
7153 | int ret; | |
4b46fce2 | 7154 | |
4b46fce2 | 7155 | alloc_hint = get_extent_allocation_hint(inode, start, len); |
00361589 | 7156 | ret = btrfs_reserve_extent(root, len, root->sectorsize, 0, |
e570fd27 | 7157 | alloc_hint, &ins, 1, 1); |
00361589 JB |
7158 | if (ret) |
7159 | return ERR_PTR(ret); | |
4b46fce2 | 7160 | |
70c8a91c | 7161 | em = create_pinned_em(inode, start, ins.offset, start, ins.objectid, |
cc95bef6 | 7162 | ins.offset, ins.offset, ins.offset, 0); |
00361589 | 7163 | if (IS_ERR(em)) { |
e570fd27 | 7164 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7165 | return em; |
7166 | } | |
4b46fce2 JB |
7167 | |
7168 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
7169 | ins.offset, ins.offset, 0); | |
7170 | if (ret) { | |
e570fd27 | 7171 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset, 1); |
00361589 JB |
7172 | free_extent_map(em); |
7173 | return ERR_PTR(ret); | |
4b46fce2 | 7174 | } |
00361589 | 7175 | |
4b46fce2 JB |
7176 | return em; |
7177 | } | |
7178 | ||
46bfbb5c CM |
7179 | /* |
7180 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
7181 | * block must be cow'd | |
7182 | */ | |
00361589 | 7183 | noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, |
7ee9e440 JB |
7184 | u64 *orig_start, u64 *orig_block_len, |
7185 | u64 *ram_bytes) | |
46bfbb5c | 7186 | { |
00361589 | 7187 | struct btrfs_trans_handle *trans; |
46bfbb5c CM |
7188 | struct btrfs_path *path; |
7189 | int ret; | |
7190 | struct extent_buffer *leaf; | |
7191 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7b2b7085 | 7192 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
46bfbb5c CM |
7193 | struct btrfs_file_extent_item *fi; |
7194 | struct btrfs_key key; | |
7195 | u64 disk_bytenr; | |
7196 | u64 backref_offset; | |
7197 | u64 extent_end; | |
7198 | u64 num_bytes; | |
7199 | int slot; | |
7200 | int found_type; | |
7ee9e440 | 7201 | bool nocow = (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW); |
e77751aa | 7202 | |
46bfbb5c CM |
7203 | path = btrfs_alloc_path(); |
7204 | if (!path) | |
7205 | return -ENOMEM; | |
7206 | ||
00361589 | 7207 | ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), |
46bfbb5c CM |
7208 | offset, 0); |
7209 | if (ret < 0) | |
7210 | goto out; | |
7211 | ||
7212 | slot = path->slots[0]; | |
7213 | if (ret == 1) { | |
7214 | if (slot == 0) { | |
7215 | /* can't find the item, must cow */ | |
7216 | ret = 0; | |
7217 | goto out; | |
7218 | } | |
7219 | slot--; | |
7220 | } | |
7221 | ret = 0; | |
7222 | leaf = path->nodes[0]; | |
7223 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
33345d01 | 7224 | if (key.objectid != btrfs_ino(inode) || |
46bfbb5c CM |
7225 | key.type != BTRFS_EXTENT_DATA_KEY) { |
7226 | /* not our file or wrong item type, must cow */ | |
7227 | goto out; | |
7228 | } | |
7229 | ||
7230 | if (key.offset > offset) { | |
7231 | /* Wrong offset, must cow */ | |
7232 | goto out; | |
7233 | } | |
7234 | ||
7235 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
7236 | found_type = btrfs_file_extent_type(leaf, fi); | |
7237 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
7238 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
7239 | /* not a regular extent, must cow */ | |
7240 | goto out; | |
7241 | } | |
7ee9e440 JB |
7242 | |
7243 | if (!nocow && found_type == BTRFS_FILE_EXTENT_REG) | |
7244 | goto out; | |
7245 | ||
e77751aa MX |
7246 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
7247 | if (extent_end <= offset) | |
7248 | goto out; | |
7249 | ||
46bfbb5c | 7250 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
7ee9e440 JB |
7251 | if (disk_bytenr == 0) |
7252 | goto out; | |
7253 | ||
7254 | if (btrfs_file_extent_compression(leaf, fi) || | |
7255 | btrfs_file_extent_encryption(leaf, fi) || | |
7256 | btrfs_file_extent_other_encoding(leaf, fi)) | |
7257 | goto out; | |
7258 | ||
46bfbb5c CM |
7259 | backref_offset = btrfs_file_extent_offset(leaf, fi); |
7260 | ||
7ee9e440 JB |
7261 | if (orig_start) { |
7262 | *orig_start = key.offset - backref_offset; | |
7263 | *orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi); | |
7264 | *ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); | |
7265 | } | |
eb384b55 | 7266 | |
46bfbb5c CM |
7267 | if (btrfs_extent_readonly(root, disk_bytenr)) |
7268 | goto out; | |
7b2b7085 MX |
7269 | |
7270 | num_bytes = min(offset + *len, extent_end) - offset; | |
7271 | if (!nocow && found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
7272 | u64 range_end; | |
7273 | ||
7274 | range_end = round_up(offset + num_bytes, root->sectorsize) - 1; | |
7275 | ret = test_range_bit(io_tree, offset, range_end, | |
7276 | EXTENT_DELALLOC, 0, NULL); | |
7277 | if (ret) { | |
7278 | ret = -EAGAIN; | |
7279 | goto out; | |
7280 | } | |
7281 | } | |
7282 | ||
1bda19eb | 7283 | btrfs_release_path(path); |
46bfbb5c CM |
7284 | |
7285 | /* | |
7286 | * look for other files referencing this extent, if we | |
7287 | * find any we must cow | |
7288 | */ | |
00361589 JB |
7289 | trans = btrfs_join_transaction(root); |
7290 | if (IS_ERR(trans)) { | |
7291 | ret = 0; | |
46bfbb5c | 7292 | goto out; |
00361589 JB |
7293 | } |
7294 | ||
7295 | ret = btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), | |
7296 | key.offset - backref_offset, disk_bytenr); | |
7297 | btrfs_end_transaction(trans, root); | |
7298 | if (ret) { | |
7299 | ret = 0; | |
7300 | goto out; | |
7301 | } | |
46bfbb5c CM |
7302 | |
7303 | /* | |
7304 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
7305 | * in this extent we are about to write. If there | |
7306 | * are any csums in that range we have to cow in order | |
7307 | * to keep the csums correct | |
7308 | */ | |
7309 | disk_bytenr += backref_offset; | |
7310 | disk_bytenr += offset - key.offset; | |
46bfbb5c CM |
7311 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
7312 | goto out; | |
7313 | /* | |
7314 | * all of the above have passed, it is safe to overwrite this extent | |
7315 | * without cow | |
7316 | */ | |
eb384b55 | 7317 | *len = num_bytes; |
46bfbb5c CM |
7318 | ret = 1; |
7319 | out: | |
7320 | btrfs_free_path(path); | |
7321 | return ret; | |
7322 | } | |
7323 | ||
fc4adbff AG |
7324 | bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end) |
7325 | { | |
7326 | struct radix_tree_root *root = &inode->i_mapping->page_tree; | |
7327 | int found = false; | |
7328 | void **pagep = NULL; | |
7329 | struct page *page = NULL; | |
7330 | int start_idx; | |
7331 | int end_idx; | |
7332 | ||
7333 | start_idx = start >> PAGE_CACHE_SHIFT; | |
7334 | ||
7335 | /* | |
7336 | * end is the last byte in the last page. end == start is legal | |
7337 | */ | |
7338 | end_idx = end >> PAGE_CACHE_SHIFT; | |
7339 | ||
7340 | rcu_read_lock(); | |
7341 | ||
7342 | /* Most of the code in this while loop is lifted from | |
7343 | * find_get_page. It's been modified to begin searching from a | |
7344 | * page and return just the first page found in that range. If the | |
7345 | * found idx is less than or equal to the end idx then we know that | |
7346 | * a page exists. If no pages are found or if those pages are | |
7347 | * outside of the range then we're fine (yay!) */ | |
7348 | while (page == NULL && | |
7349 | radix_tree_gang_lookup_slot(root, &pagep, NULL, start_idx, 1)) { | |
7350 | page = radix_tree_deref_slot(pagep); | |
7351 | if (unlikely(!page)) | |
7352 | break; | |
7353 | ||
7354 | if (radix_tree_exception(page)) { | |
809f9016 FM |
7355 | if (radix_tree_deref_retry(page)) { |
7356 | page = NULL; | |
fc4adbff | 7357 | continue; |
809f9016 | 7358 | } |
fc4adbff AG |
7359 | /* |
7360 | * Otherwise, shmem/tmpfs must be storing a swap entry | |
7361 | * here as an exceptional entry: so return it without | |
7362 | * attempting to raise page count. | |
7363 | */ | |
6fdef6d4 | 7364 | page = NULL; |
fc4adbff AG |
7365 | break; /* TODO: Is this relevant for this use case? */ |
7366 | } | |
7367 | ||
91405151 FM |
7368 | if (!page_cache_get_speculative(page)) { |
7369 | page = NULL; | |
fc4adbff | 7370 | continue; |
91405151 | 7371 | } |
fc4adbff AG |
7372 | |
7373 | /* | |
7374 | * Has the page moved? | |
7375 | * This is part of the lockless pagecache protocol. See | |
7376 | * include/linux/pagemap.h for details. | |
7377 | */ | |
7378 | if (unlikely(page != *pagep)) { | |
7379 | page_cache_release(page); | |
7380 | page = NULL; | |
7381 | } | |
7382 | } | |
7383 | ||
7384 | if (page) { | |
7385 | if (page->index <= end_idx) | |
7386 | found = true; | |
7387 | page_cache_release(page); | |
7388 | } | |
7389 | ||
7390 | rcu_read_unlock(); | |
7391 | return found; | |
7392 | } | |
7393 | ||
eb838e73 JB |
7394 | static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, |
7395 | struct extent_state **cached_state, int writing) | |
7396 | { | |
7397 | struct btrfs_ordered_extent *ordered; | |
7398 | int ret = 0; | |
7399 | ||
7400 | while (1) { | |
7401 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
7402 | 0, cached_state); | |
7403 | /* | |
7404 | * We're concerned with the entire range that we're going to be | |
7405 | * doing DIO to, so we need to make sure theres no ordered | |
7406 | * extents in this range. | |
7407 | */ | |
7408 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
7409 | lockend - lockstart + 1); | |
7410 | ||
7411 | /* | |
7412 | * We need to make sure there are no buffered pages in this | |
7413 | * range either, we could have raced between the invalidate in | |
7414 | * generic_file_direct_write and locking the extent. The | |
7415 | * invalidate needs to happen so that reads after a write do not | |
7416 | * get stale data. | |
7417 | */ | |
fc4adbff AG |
7418 | if (!ordered && |
7419 | (!writing || | |
7420 | !btrfs_page_exists_in_range(inode, lockstart, lockend))) | |
eb838e73 JB |
7421 | break; |
7422 | ||
7423 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
7424 | cached_state, GFP_NOFS); | |
7425 | ||
7426 | if (ordered) { | |
7427 | btrfs_start_ordered_extent(inode, ordered, 1); | |
7428 | btrfs_put_ordered_extent(ordered); | |
7429 | } else { | |
7430 | /* Screw you mmap */ | |
728404da | 7431 | ret = btrfs_fdatawrite_range(inode, lockstart, lockend); |
075bdbdb FM |
7432 | if (ret) |
7433 | break; | |
7434 | ret = filemap_fdatawait_range(inode->i_mapping, | |
7435 | lockstart, | |
7436 | lockend); | |
eb838e73 JB |
7437 | if (ret) |
7438 | break; | |
7439 | ||
7440 | /* | |
7441 | * If we found a page that couldn't be invalidated just | |
7442 | * fall back to buffered. | |
7443 | */ | |
7444 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
7445 | lockstart >> PAGE_CACHE_SHIFT, | |
7446 | lockend >> PAGE_CACHE_SHIFT); | |
7447 | if (ret) | |
7448 | break; | |
7449 | } | |
7450 | ||
7451 | cond_resched(); | |
7452 | } | |
7453 | ||
7454 | return ret; | |
7455 | } | |
7456 | ||
69ffb543 JB |
7457 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
7458 | u64 len, u64 orig_start, | |
7459 | u64 block_start, u64 block_len, | |
cc95bef6 JB |
7460 | u64 orig_block_len, u64 ram_bytes, |
7461 | int type) | |
69ffb543 JB |
7462 | { |
7463 | struct extent_map_tree *em_tree; | |
7464 | struct extent_map *em; | |
7465 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7466 | int ret; | |
7467 | ||
7468 | em_tree = &BTRFS_I(inode)->extent_tree; | |
7469 | em = alloc_extent_map(); | |
7470 | if (!em) | |
7471 | return ERR_PTR(-ENOMEM); | |
7472 | ||
7473 | em->start = start; | |
7474 | em->orig_start = orig_start; | |
2ab28f32 JB |
7475 | em->mod_start = start; |
7476 | em->mod_len = len; | |
69ffb543 JB |
7477 | em->len = len; |
7478 | em->block_len = block_len; | |
7479 | em->block_start = block_start; | |
7480 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
b4939680 | 7481 | em->orig_block_len = orig_block_len; |
cc95bef6 | 7482 | em->ram_bytes = ram_bytes; |
70c8a91c | 7483 | em->generation = -1; |
69ffb543 JB |
7484 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
7485 | if (type == BTRFS_ORDERED_PREALLOC) | |
b11e234d | 7486 | set_bit(EXTENT_FLAG_FILLING, &em->flags); |
69ffb543 JB |
7487 | |
7488 | do { | |
7489 | btrfs_drop_extent_cache(inode, em->start, | |
7490 | em->start + em->len - 1, 0); | |
7491 | write_lock(&em_tree->lock); | |
09a2a8f9 | 7492 | ret = add_extent_mapping(em_tree, em, 1); |
69ffb543 JB |
7493 | write_unlock(&em_tree->lock); |
7494 | } while (ret == -EEXIST); | |
7495 | ||
7496 | if (ret) { | |
7497 | free_extent_map(em); | |
7498 | return ERR_PTR(ret); | |
7499 | } | |
7500 | ||
7501 | return em; | |
7502 | } | |
7503 | ||
50745b0a | 7504 | struct btrfs_dio_data { |
7505 | u64 outstanding_extents; | |
7506 | u64 reserve; | |
7507 | }; | |
69ffb543 | 7508 | |
9c9464cc FM |
7509 | static void adjust_dio_outstanding_extents(struct inode *inode, |
7510 | struct btrfs_dio_data *dio_data, | |
7511 | const u64 len) | |
7512 | { | |
7513 | unsigned num_extents; | |
7514 | ||
7515 | num_extents = (unsigned) div64_u64(len + BTRFS_MAX_EXTENT_SIZE - 1, | |
7516 | BTRFS_MAX_EXTENT_SIZE); | |
7517 | /* | |
7518 | * If we have an outstanding_extents count still set then we're | |
7519 | * within our reservation, otherwise we need to adjust our inode | |
7520 | * counter appropriately. | |
7521 | */ | |
7522 | if (dio_data->outstanding_extents) { | |
7523 | dio_data->outstanding_extents -= num_extents; | |
7524 | } else { | |
7525 | spin_lock(&BTRFS_I(inode)->lock); | |
7526 | BTRFS_I(inode)->outstanding_extents += num_extents; | |
7527 | spin_unlock(&BTRFS_I(inode)->lock); | |
7528 | } | |
7529 | } | |
7530 | ||
4b46fce2 JB |
7531 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
7532 | struct buffer_head *bh_result, int create) | |
7533 | { | |
7534 | struct extent_map *em; | |
7535 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
eb838e73 | 7536 | struct extent_state *cached_state = NULL; |
50745b0a | 7537 | struct btrfs_dio_data *dio_data = NULL; |
4b46fce2 | 7538 | u64 start = iblock << inode->i_blkbits; |
eb838e73 | 7539 | u64 lockstart, lockend; |
4b46fce2 | 7540 | u64 len = bh_result->b_size; |
eb838e73 | 7541 | int unlock_bits = EXTENT_LOCKED; |
0934856d | 7542 | int ret = 0; |
eb838e73 | 7543 | |
172a5049 | 7544 | if (create) |
3266789f | 7545 | unlock_bits |= EXTENT_DIRTY; |
172a5049 | 7546 | else |
c329861d | 7547 | len = min_t(u64, len, root->sectorsize); |
eb838e73 | 7548 | |
c329861d JB |
7549 | lockstart = start; |
7550 | lockend = start + len - 1; | |
7551 | ||
e1cbbfa5 JB |
7552 | if (current->journal_info) { |
7553 | /* | |
7554 | * Need to pull our outstanding extents and set journal_info to NULL so | |
7555 | * that anything that needs to check if there's a transction doesn't get | |
7556 | * confused. | |
7557 | */ | |
50745b0a | 7558 | dio_data = current->journal_info; |
e1cbbfa5 JB |
7559 | current->journal_info = NULL; |
7560 | } | |
7561 | ||
eb838e73 JB |
7562 | /* |
7563 | * If this errors out it's because we couldn't invalidate pagecache for | |
7564 | * this range and we need to fallback to buffered. | |
7565 | */ | |
9c9464cc FM |
7566 | if (lock_extent_direct(inode, lockstart, lockend, &cached_state, |
7567 | create)) { | |
7568 | ret = -ENOTBLK; | |
7569 | goto err; | |
7570 | } | |
eb838e73 | 7571 | |
4b46fce2 | 7572 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
eb838e73 JB |
7573 | if (IS_ERR(em)) { |
7574 | ret = PTR_ERR(em); | |
7575 | goto unlock_err; | |
7576 | } | |
4b46fce2 JB |
7577 | |
7578 | /* | |
7579 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
7580 | * io. INLINE is special, and we could probably kludge it in here, but | |
7581 | * it's still buffered so for safety lets just fall back to the generic | |
7582 | * buffered path. | |
7583 | * | |
7584 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
7585 | * decompress it, so there will be buffering required no matter what we | |
7586 | * do, so go ahead and fallback to buffered. | |
7587 | * | |
7588 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
7589 | * to buffered IO. Don't blame me, this is the price we pay for using | |
7590 | * the generic code. | |
7591 | */ | |
7592 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
7593 | em->block_start == EXTENT_MAP_INLINE) { | |
7594 | free_extent_map(em); | |
eb838e73 JB |
7595 | ret = -ENOTBLK; |
7596 | goto unlock_err; | |
4b46fce2 JB |
7597 | } |
7598 | ||
7599 | /* Just a good old fashioned hole, return */ | |
7600 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
7601 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
7602 | free_extent_map(em); | |
eb838e73 | 7603 | goto unlock_err; |
4b46fce2 JB |
7604 | } |
7605 | ||
7606 | /* | |
7607 | * We don't allocate a new extent in the following cases | |
7608 | * | |
7609 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
7610 | * existing extent. | |
7611 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
7612 | * just use the extent. | |
7613 | * | |
7614 | */ | |
46bfbb5c | 7615 | if (!create) { |
eb838e73 JB |
7616 | len = min(len, em->len - (start - em->start)); |
7617 | lockstart = start + len; | |
7618 | goto unlock; | |
46bfbb5c | 7619 | } |
4b46fce2 JB |
7620 | |
7621 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
7622 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
7623 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 | 7624 | int type; |
eb384b55 | 7625 | u64 block_start, orig_start, orig_block_len, ram_bytes; |
4b46fce2 JB |
7626 | |
7627 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7628 | type = BTRFS_ORDERED_PREALLOC; | |
7629 | else | |
7630 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 7631 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 7632 | block_start = em->block_start + (start - em->start); |
46bfbb5c | 7633 | |
00361589 | 7634 | if (can_nocow_extent(inode, start, &len, &orig_start, |
7ee9e440 | 7635 | &orig_block_len, &ram_bytes) == 1) { |
69ffb543 JB |
7636 | if (type == BTRFS_ORDERED_PREALLOC) { |
7637 | free_extent_map(em); | |
7638 | em = create_pinned_em(inode, start, len, | |
7639 | orig_start, | |
b4939680 | 7640 | block_start, len, |
cc95bef6 JB |
7641 | orig_block_len, |
7642 | ram_bytes, type); | |
555e1286 FM |
7643 | if (IS_ERR(em)) { |
7644 | ret = PTR_ERR(em); | |
69ffb543 | 7645 | goto unlock_err; |
555e1286 | 7646 | } |
69ffb543 JB |
7647 | } |
7648 | ||
46bfbb5c CM |
7649 | ret = btrfs_add_ordered_extent_dio(inode, start, |
7650 | block_start, len, len, type); | |
46bfbb5c CM |
7651 | if (ret) { |
7652 | free_extent_map(em); | |
eb838e73 | 7653 | goto unlock_err; |
46bfbb5c CM |
7654 | } |
7655 | goto unlock; | |
4b46fce2 | 7656 | } |
4b46fce2 | 7657 | } |
00361589 | 7658 | |
46bfbb5c CM |
7659 | /* |
7660 | * this will cow the extent, reset the len in case we changed | |
7661 | * it above | |
7662 | */ | |
7663 | len = bh_result->b_size; | |
70c8a91c JB |
7664 | free_extent_map(em); |
7665 | em = btrfs_new_extent_direct(inode, start, len); | |
eb838e73 JB |
7666 | if (IS_ERR(em)) { |
7667 | ret = PTR_ERR(em); | |
7668 | goto unlock_err; | |
7669 | } | |
46bfbb5c CM |
7670 | len = min(len, em->len - (start - em->start)); |
7671 | unlock: | |
4b46fce2 JB |
7672 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
7673 | inode->i_blkbits; | |
46bfbb5c | 7674 | bh_result->b_size = len; |
4b46fce2 JB |
7675 | bh_result->b_bdev = em->bdev; |
7676 | set_buffer_mapped(bh_result); | |
c3473e83 JB |
7677 | if (create) { |
7678 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
7679 | set_buffer_new(bh_result); | |
7680 | ||
7681 | /* | |
7682 | * Need to update the i_size under the extent lock so buffered | |
7683 | * readers will get the updated i_size when we unlock. | |
7684 | */ | |
7685 | if (start + len > i_size_read(inode)) | |
7686 | i_size_write(inode, start + len); | |
0934856d | 7687 | |
9c9464cc | 7688 | adjust_dio_outstanding_extents(inode, dio_data, len); |
7cf5b976 | 7689 | btrfs_free_reserved_data_space(inode, start, len); |
50745b0a | 7690 | WARN_ON(dio_data->reserve < len); |
7691 | dio_data->reserve -= len; | |
7692 | current->journal_info = dio_data; | |
c3473e83 | 7693 | } |
4b46fce2 | 7694 | |
eb838e73 JB |
7695 | /* |
7696 | * In the case of write we need to clear and unlock the entire range, | |
7697 | * in the case of read we need to unlock only the end area that we | |
7698 | * aren't using if there is any left over space. | |
7699 | */ | |
24c03fa5 | 7700 | if (lockstart < lockend) { |
0934856d MX |
7701 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
7702 | lockend, unlock_bits, 1, 0, | |
7703 | &cached_state, GFP_NOFS); | |
24c03fa5 | 7704 | } else { |
eb838e73 | 7705 | free_extent_state(cached_state); |
24c03fa5 | 7706 | } |
eb838e73 | 7707 | |
4b46fce2 JB |
7708 | free_extent_map(em); |
7709 | ||
7710 | return 0; | |
eb838e73 JB |
7711 | |
7712 | unlock_err: | |
eb838e73 JB |
7713 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
7714 | unlock_bits, 1, 0, &cached_state, GFP_NOFS); | |
9c9464cc | 7715 | err: |
50745b0a | 7716 | if (dio_data) |
7717 | current->journal_info = dio_data; | |
9c9464cc FM |
7718 | /* |
7719 | * Compensate the delalloc release we do in btrfs_direct_IO() when we | |
7720 | * write less data then expected, so that we don't underflow our inode's | |
7721 | * outstanding extents counter. | |
7722 | */ | |
7723 | if (create && dio_data) | |
7724 | adjust_dio_outstanding_extents(inode, dio_data, len); | |
7725 | ||
eb838e73 | 7726 | return ret; |
4b46fce2 JB |
7727 | } |
7728 | ||
8b110e39 MX |
7729 | static inline int submit_dio_repair_bio(struct inode *inode, struct bio *bio, |
7730 | int rw, int mirror_num) | |
7731 | { | |
7732 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
7733 | int ret; | |
7734 | ||
7735 | BUG_ON(rw & REQ_WRITE); | |
7736 | ||
7737 | bio_get(bio); | |
7738 | ||
7739 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, | |
7740 | BTRFS_WQ_ENDIO_DIO_REPAIR); | |
7741 | if (ret) | |
7742 | goto err; | |
7743 | ||
7744 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); | |
7745 | err: | |
7746 | bio_put(bio); | |
7747 | return ret; | |
7748 | } | |
7749 | ||
7750 | static int btrfs_check_dio_repairable(struct inode *inode, | |
7751 | struct bio *failed_bio, | |
7752 | struct io_failure_record *failrec, | |
7753 | int failed_mirror) | |
7754 | { | |
7755 | int num_copies; | |
7756 | ||
7757 | num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, | |
7758 | failrec->logical, failrec->len); | |
7759 | if (num_copies == 1) { | |
7760 | /* | |
7761 | * we only have a single copy of the data, so don't bother with | |
7762 | * all the retry and error correction code that follows. no | |
7763 | * matter what the error is, it is very likely to persist. | |
7764 | */ | |
7765 | pr_debug("Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7766 | num_copies, failrec->this_mirror, failed_mirror); | |
7767 | return 0; | |
7768 | } | |
7769 | ||
7770 | failrec->failed_mirror = failed_mirror; | |
7771 | failrec->this_mirror++; | |
7772 | if (failrec->this_mirror == failed_mirror) | |
7773 | failrec->this_mirror++; | |
7774 | ||
7775 | if (failrec->this_mirror > num_copies) { | |
7776 | pr_debug("Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n", | |
7777 | num_copies, failrec->this_mirror, failed_mirror); | |
7778 | return 0; | |
7779 | } | |
7780 | ||
7781 | return 1; | |
7782 | } | |
7783 | ||
7784 | static int dio_read_error(struct inode *inode, struct bio *failed_bio, | |
7785 | struct page *page, u64 start, u64 end, | |
7786 | int failed_mirror, bio_end_io_t *repair_endio, | |
7787 | void *repair_arg) | |
7788 | { | |
7789 | struct io_failure_record *failrec; | |
7790 | struct bio *bio; | |
7791 | int isector; | |
7792 | int read_mode; | |
7793 | int ret; | |
7794 | ||
7795 | BUG_ON(failed_bio->bi_rw & REQ_WRITE); | |
7796 | ||
7797 | ret = btrfs_get_io_failure_record(inode, start, end, &failrec); | |
7798 | if (ret) | |
7799 | return ret; | |
7800 | ||
7801 | ret = btrfs_check_dio_repairable(inode, failed_bio, failrec, | |
7802 | failed_mirror); | |
7803 | if (!ret) { | |
7804 | free_io_failure(inode, failrec); | |
7805 | return -EIO; | |
7806 | } | |
7807 | ||
7808 | if (failed_bio->bi_vcnt > 1) | |
7809 | read_mode = READ_SYNC | REQ_FAILFAST_DEV; | |
7810 | else | |
7811 | read_mode = READ_SYNC; | |
7812 | ||
7813 | isector = start - btrfs_io_bio(failed_bio)->logical; | |
7814 | isector >>= inode->i_sb->s_blocksize_bits; | |
7815 | bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, | |
7816 | 0, isector, repair_endio, repair_arg); | |
7817 | if (!bio) { | |
7818 | free_io_failure(inode, failrec); | |
7819 | return -EIO; | |
7820 | } | |
7821 | ||
7822 | btrfs_debug(BTRFS_I(inode)->root->fs_info, | |
7823 | "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n", | |
7824 | read_mode, failrec->this_mirror, failrec->in_validation); | |
7825 | ||
7826 | ret = submit_dio_repair_bio(inode, bio, read_mode, | |
7827 | failrec->this_mirror); | |
7828 | if (ret) { | |
7829 | free_io_failure(inode, failrec); | |
7830 | bio_put(bio); | |
7831 | } | |
7832 | ||
7833 | return ret; | |
7834 | } | |
7835 | ||
7836 | struct btrfs_retry_complete { | |
7837 | struct completion done; | |
7838 | struct inode *inode; | |
7839 | u64 start; | |
7840 | int uptodate; | |
7841 | }; | |
7842 | ||
4246a0b6 | 7843 | static void btrfs_retry_endio_nocsum(struct bio *bio) |
8b110e39 MX |
7844 | { |
7845 | struct btrfs_retry_complete *done = bio->bi_private; | |
7846 | struct bio_vec *bvec; | |
7847 | int i; | |
7848 | ||
4246a0b6 | 7849 | if (bio->bi_error) |
8b110e39 MX |
7850 | goto end; |
7851 | ||
7852 | done->uptodate = 1; | |
7853 | bio_for_each_segment_all(bvec, bio, i) | |
7854 | clean_io_failure(done->inode, done->start, bvec->bv_page, 0); | |
7855 | end: | |
7856 | complete(&done->done); | |
7857 | bio_put(bio); | |
7858 | } | |
7859 | ||
7860 | static int __btrfs_correct_data_nocsum(struct inode *inode, | |
7861 | struct btrfs_io_bio *io_bio) | |
4b46fce2 | 7862 | { |
2c30c71b | 7863 | struct bio_vec *bvec; |
8b110e39 | 7864 | struct btrfs_retry_complete done; |
4b46fce2 | 7865 | u64 start; |
2c30c71b | 7866 | int i; |
c1dc0896 | 7867 | int ret; |
4b46fce2 | 7868 | |
8b110e39 MX |
7869 | start = io_bio->logical; |
7870 | done.inode = inode; | |
7871 | ||
7872 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { | |
7873 | try_again: | |
7874 | done.uptodate = 0; | |
7875 | done.start = start; | |
7876 | init_completion(&done.done); | |
7877 | ||
7878 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7879 | start + bvec->bv_len - 1, | |
7880 | io_bio->mirror_num, | |
7881 | btrfs_retry_endio_nocsum, &done); | |
7882 | if (ret) | |
7883 | return ret; | |
7884 | ||
7885 | wait_for_completion(&done.done); | |
7886 | ||
7887 | if (!done.uptodate) { | |
7888 | /* We might have another mirror, so try again */ | |
7889 | goto try_again; | |
7890 | } | |
7891 | ||
7892 | start += bvec->bv_len; | |
7893 | } | |
7894 | ||
7895 | return 0; | |
7896 | } | |
7897 | ||
4246a0b6 | 7898 | static void btrfs_retry_endio(struct bio *bio) |
8b110e39 MX |
7899 | { |
7900 | struct btrfs_retry_complete *done = bio->bi_private; | |
7901 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
7902 | struct bio_vec *bvec; | |
7903 | int uptodate; | |
7904 | int ret; | |
7905 | int i; | |
7906 | ||
4246a0b6 | 7907 | if (bio->bi_error) |
8b110e39 MX |
7908 | goto end; |
7909 | ||
7910 | uptodate = 1; | |
7911 | bio_for_each_segment_all(bvec, bio, i) { | |
7912 | ret = __readpage_endio_check(done->inode, io_bio, i, | |
7913 | bvec->bv_page, 0, | |
7914 | done->start, bvec->bv_len); | |
7915 | if (!ret) | |
7916 | clean_io_failure(done->inode, done->start, | |
7917 | bvec->bv_page, 0); | |
7918 | else | |
7919 | uptodate = 0; | |
7920 | } | |
7921 | ||
7922 | done->uptodate = uptodate; | |
7923 | end: | |
7924 | complete(&done->done); | |
7925 | bio_put(bio); | |
7926 | } | |
7927 | ||
7928 | static int __btrfs_subio_endio_read(struct inode *inode, | |
7929 | struct btrfs_io_bio *io_bio, int err) | |
7930 | { | |
7931 | struct bio_vec *bvec; | |
7932 | struct btrfs_retry_complete done; | |
7933 | u64 start; | |
7934 | u64 offset = 0; | |
7935 | int i; | |
7936 | int ret; | |
dc380aea | 7937 | |
8b110e39 | 7938 | err = 0; |
c1dc0896 | 7939 | start = io_bio->logical; |
8b110e39 MX |
7940 | done.inode = inode; |
7941 | ||
c1dc0896 | 7942 | bio_for_each_segment_all(bvec, &io_bio->bio, i) { |
dc380aea MX |
7943 | ret = __readpage_endio_check(inode, io_bio, i, bvec->bv_page, |
7944 | 0, start, bvec->bv_len); | |
8b110e39 MX |
7945 | if (likely(!ret)) |
7946 | goto next; | |
7947 | try_again: | |
7948 | done.uptodate = 0; | |
7949 | done.start = start; | |
7950 | init_completion(&done.done); | |
7951 | ||
7952 | ret = dio_read_error(inode, &io_bio->bio, bvec->bv_page, start, | |
7953 | start + bvec->bv_len - 1, | |
7954 | io_bio->mirror_num, | |
7955 | btrfs_retry_endio, &done); | |
7956 | if (ret) { | |
7957 | err = ret; | |
7958 | goto next; | |
7959 | } | |
7960 | ||
7961 | wait_for_completion(&done.done); | |
7962 | ||
7963 | if (!done.uptodate) { | |
7964 | /* We might have another mirror, so try again */ | |
7965 | goto try_again; | |
7966 | } | |
7967 | next: | |
7968 | offset += bvec->bv_len; | |
4b46fce2 | 7969 | start += bvec->bv_len; |
2c30c71b | 7970 | } |
c1dc0896 MX |
7971 | |
7972 | return err; | |
7973 | } | |
7974 | ||
8b110e39 MX |
7975 | static int btrfs_subio_endio_read(struct inode *inode, |
7976 | struct btrfs_io_bio *io_bio, int err) | |
7977 | { | |
7978 | bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
7979 | ||
7980 | if (skip_csum) { | |
7981 | if (unlikely(err)) | |
7982 | return __btrfs_correct_data_nocsum(inode, io_bio); | |
7983 | else | |
7984 | return 0; | |
7985 | } else { | |
7986 | return __btrfs_subio_endio_read(inode, io_bio, err); | |
7987 | } | |
7988 | } | |
7989 | ||
4246a0b6 | 7990 | static void btrfs_endio_direct_read(struct bio *bio) |
c1dc0896 MX |
7991 | { |
7992 | struct btrfs_dio_private *dip = bio->bi_private; | |
7993 | struct inode *inode = dip->inode; | |
7994 | struct bio *dio_bio; | |
7995 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
4246a0b6 | 7996 | int err = bio->bi_error; |
c1dc0896 | 7997 | |
8b110e39 MX |
7998 | if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) |
7999 | err = btrfs_subio_endio_read(inode, io_bio, err); | |
c1dc0896 | 8000 | |
4b46fce2 | 8001 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, |
d0082371 | 8002 | dip->logical_offset + dip->bytes - 1); |
9be3395b | 8003 | dio_bio = dip->dio_bio; |
4b46fce2 | 8004 | |
4b46fce2 | 8005 | kfree(dip); |
c0da7aa1 | 8006 | |
4246a0b6 | 8007 | dio_end_io(dio_bio, bio->bi_error); |
23ea8e5a MX |
8008 | |
8009 | if (io_bio->end_io) | |
8010 | io_bio->end_io(io_bio, err); | |
9be3395b | 8011 | bio_put(bio); |
4b46fce2 JB |
8012 | } |
8013 | ||
4246a0b6 | 8014 | static void btrfs_endio_direct_write(struct bio *bio) |
4b46fce2 JB |
8015 | { |
8016 | struct btrfs_dio_private *dip = bio->bi_private; | |
8017 | struct inode *inode = dip->inode; | |
8018 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4b46fce2 | 8019 | struct btrfs_ordered_extent *ordered = NULL; |
163cf09c CM |
8020 | u64 ordered_offset = dip->logical_offset; |
8021 | u64 ordered_bytes = dip->bytes; | |
9be3395b | 8022 | struct bio *dio_bio; |
4b46fce2 JB |
8023 | int ret; |
8024 | ||
163cf09c CM |
8025 | again: |
8026 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
8027 | &ordered_offset, | |
4246a0b6 CH |
8028 | ordered_bytes, |
8029 | !bio->bi_error); | |
4b46fce2 | 8030 | if (!ret) |
163cf09c | 8031 | goto out_test; |
4b46fce2 | 8032 | |
9e0af237 LB |
8033 | btrfs_init_work(&ordered->work, btrfs_endio_write_helper, |
8034 | finish_ordered_fn, NULL, NULL); | |
fccb5d86 QW |
8035 | btrfs_queue_work(root->fs_info->endio_write_workers, |
8036 | &ordered->work); | |
163cf09c CM |
8037 | out_test: |
8038 | /* | |
8039 | * our bio might span multiple ordered extents. If we haven't | |
8040 | * completed the accounting for the whole dio, go back and try again | |
8041 | */ | |
8042 | if (ordered_offset < dip->logical_offset + dip->bytes) { | |
8043 | ordered_bytes = dip->logical_offset + dip->bytes - | |
8044 | ordered_offset; | |
5fd02043 | 8045 | ordered = NULL; |
163cf09c CM |
8046 | goto again; |
8047 | } | |
9be3395b | 8048 | dio_bio = dip->dio_bio; |
4b46fce2 | 8049 | |
4b46fce2 | 8050 | kfree(dip); |
c0da7aa1 | 8051 | |
4246a0b6 | 8052 | dio_end_io(dio_bio, bio->bi_error); |
9be3395b | 8053 | bio_put(bio); |
4b46fce2 JB |
8054 | } |
8055 | ||
eaf25d93 CM |
8056 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
8057 | struct bio *bio, int mirror_num, | |
8058 | unsigned long bio_flags, u64 offset) | |
8059 | { | |
8060 | int ret; | |
8061 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8062 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
79787eaa | 8063 | BUG_ON(ret); /* -ENOMEM */ |
eaf25d93 CM |
8064 | return 0; |
8065 | } | |
8066 | ||
4246a0b6 | 8067 | static void btrfs_end_dio_bio(struct bio *bio) |
e65e1535 MX |
8068 | { |
8069 | struct btrfs_dio_private *dip = bio->bi_private; | |
4246a0b6 | 8070 | int err = bio->bi_error; |
e65e1535 | 8071 | |
8b110e39 MX |
8072 | if (err) |
8073 | btrfs_warn(BTRFS_I(dip->inode)->root->fs_info, | |
8074 | "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d", | |
8075 | btrfs_ino(dip->inode), bio->bi_rw, | |
8076 | (unsigned long long)bio->bi_iter.bi_sector, | |
8077 | bio->bi_iter.bi_size, err); | |
8078 | ||
8079 | if (dip->subio_endio) | |
8080 | err = dip->subio_endio(dip->inode, btrfs_io_bio(bio), err); | |
c1dc0896 MX |
8081 | |
8082 | if (err) { | |
e65e1535 MX |
8083 | dip->errors = 1; |
8084 | ||
8085 | /* | |
8086 | * before atomic variable goto zero, we must make sure | |
8087 | * dip->errors is perceived to be set. | |
8088 | */ | |
4e857c58 | 8089 | smp_mb__before_atomic(); |
e65e1535 MX |
8090 | } |
8091 | ||
8092 | /* if there are more bios still pending for this dio, just exit */ | |
8093 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
8094 | goto out; | |
8095 | ||
9be3395b | 8096 | if (dip->errors) { |
e65e1535 | 8097 | bio_io_error(dip->orig_bio); |
9be3395b | 8098 | } else { |
4246a0b6 CH |
8099 | dip->dio_bio->bi_error = 0; |
8100 | bio_endio(dip->orig_bio); | |
e65e1535 MX |
8101 | } |
8102 | out: | |
8103 | bio_put(bio); | |
8104 | } | |
8105 | ||
8106 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
8107 | u64 first_sector, gfp_t gfp_flags) | |
8108 | { | |
da2f0f74 | 8109 | struct bio *bio; |
22365979 | 8110 | bio = btrfs_bio_alloc(bdev, first_sector, BIO_MAX_PAGES, gfp_flags); |
da2f0f74 CM |
8111 | if (bio) |
8112 | bio_associate_current(bio); | |
8113 | return bio; | |
e65e1535 MX |
8114 | } |
8115 | ||
c1dc0896 MX |
8116 | static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root *root, |
8117 | struct inode *inode, | |
8118 | struct btrfs_dio_private *dip, | |
8119 | struct bio *bio, | |
8120 | u64 file_offset) | |
8121 | { | |
8122 | struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); | |
8123 | struct btrfs_io_bio *orig_io_bio = btrfs_io_bio(dip->orig_bio); | |
8124 | int ret; | |
8125 | ||
8126 | /* | |
8127 | * We load all the csum data we need when we submit | |
8128 | * the first bio to reduce the csum tree search and | |
8129 | * contention. | |
8130 | */ | |
8131 | if (dip->logical_offset == file_offset) { | |
8132 | ret = btrfs_lookup_bio_sums_dio(root, inode, dip->orig_bio, | |
8133 | file_offset); | |
8134 | if (ret) | |
8135 | return ret; | |
8136 | } | |
8137 | ||
8138 | if (bio == dip->orig_bio) | |
8139 | return 0; | |
8140 | ||
8141 | file_offset -= dip->logical_offset; | |
8142 | file_offset >>= inode->i_sb->s_blocksize_bits; | |
8143 | io_bio->csum = (u8 *)(((u32 *)orig_io_bio->csum) + file_offset); | |
8144 | ||
8145 | return 0; | |
8146 | } | |
8147 | ||
e65e1535 MX |
8148 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, |
8149 | int rw, u64 file_offset, int skip_sum, | |
c329861d | 8150 | int async_submit) |
e65e1535 | 8151 | { |
facc8a22 | 8152 | struct btrfs_dio_private *dip = bio->bi_private; |
e65e1535 MX |
8153 | int write = rw & REQ_WRITE; |
8154 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
8155 | int ret; | |
8156 | ||
b812ce28 JB |
8157 | if (async_submit) |
8158 | async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers); | |
8159 | ||
e65e1535 | 8160 | bio_get(bio); |
5fd02043 JB |
8161 | |
8162 | if (!write) { | |
bfebd8b5 DS |
8163 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, |
8164 | BTRFS_WQ_ENDIO_DATA); | |
5fd02043 JB |
8165 | if (ret) |
8166 | goto err; | |
8167 | } | |
e65e1535 | 8168 | |
1ae39938 JB |
8169 | if (skip_sum) |
8170 | goto map; | |
8171 | ||
8172 | if (write && async_submit) { | |
e65e1535 MX |
8173 | ret = btrfs_wq_submit_bio(root->fs_info, |
8174 | inode, rw, bio, 0, 0, | |
8175 | file_offset, | |
8176 | __btrfs_submit_bio_start_direct_io, | |
8177 | __btrfs_submit_bio_done); | |
8178 | goto err; | |
1ae39938 JB |
8179 | } else if (write) { |
8180 | /* | |
8181 | * If we aren't doing async submit, calculate the csum of the | |
8182 | * bio now. | |
8183 | */ | |
8184 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); | |
8185 | if (ret) | |
8186 | goto err; | |
23ea8e5a | 8187 | } else { |
c1dc0896 MX |
8188 | ret = btrfs_lookup_and_bind_dio_csum(root, inode, dip, bio, |
8189 | file_offset); | |
c2db1073 TI |
8190 | if (ret) |
8191 | goto err; | |
8192 | } | |
1ae39938 JB |
8193 | map: |
8194 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); | |
e65e1535 MX |
8195 | err: |
8196 | bio_put(bio); | |
8197 | return ret; | |
8198 | } | |
8199 | ||
8200 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
8201 | int skip_sum) | |
8202 | { | |
8203 | struct inode *inode = dip->inode; | |
8204 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
e65e1535 MX |
8205 | struct bio *bio; |
8206 | struct bio *orig_bio = dip->orig_bio; | |
8207 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
4f024f37 | 8208 | u64 start_sector = orig_bio->bi_iter.bi_sector; |
e65e1535 MX |
8209 | u64 file_offset = dip->logical_offset; |
8210 | u64 submit_len = 0; | |
8211 | u64 map_length; | |
8212 | int nr_pages = 0; | |
23ea8e5a | 8213 | int ret; |
1ae39938 | 8214 | int async_submit = 0; |
e65e1535 | 8215 | |
4f024f37 | 8216 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8217 | ret = btrfs_map_block(root->fs_info, rw, start_sector << 9, |
e65e1535 | 8218 | &map_length, NULL, 0); |
7a5c3c9b | 8219 | if (ret) |
e65e1535 | 8220 | return -EIO; |
facc8a22 | 8221 | |
4f024f37 | 8222 | if (map_length >= orig_bio->bi_iter.bi_size) { |
02f57c7a | 8223 | bio = orig_bio; |
c1dc0896 | 8224 | dip->flags |= BTRFS_DIO_ORIG_BIO_SUBMITTED; |
02f57c7a JB |
8225 | goto submit; |
8226 | } | |
8227 | ||
53b381b3 | 8228 | /* async crcs make it difficult to collect full stripe writes. */ |
ffe2d203 | 8229 | if (btrfs_get_alloc_profile(root, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK) |
53b381b3 DW |
8230 | async_submit = 0; |
8231 | else | |
8232 | async_submit = 1; | |
8233 | ||
02f57c7a JB |
8234 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
8235 | if (!bio) | |
8236 | return -ENOMEM; | |
7a5c3c9b | 8237 | |
02f57c7a JB |
8238 | bio->bi_private = dip; |
8239 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8240 | btrfs_io_bio(bio)->logical = file_offset; |
02f57c7a JB |
8241 | atomic_inc(&dip->pending_bios); |
8242 | ||
e65e1535 | 8243 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
ee39b432 | 8244 | if (map_length < submit_len + bvec->bv_len || |
e65e1535 | 8245 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, |
ee39b432 | 8246 | bvec->bv_offset) < bvec->bv_len) { |
e65e1535 MX |
8247 | /* |
8248 | * inc the count before we submit the bio so | |
8249 | * we know the end IO handler won't happen before | |
8250 | * we inc the count. Otherwise, the dip might get freed | |
8251 | * before we're done setting it up | |
8252 | */ | |
8253 | atomic_inc(&dip->pending_bios); | |
8254 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
8255 | file_offset, skip_sum, | |
c329861d | 8256 | async_submit); |
e65e1535 MX |
8257 | if (ret) { |
8258 | bio_put(bio); | |
8259 | atomic_dec(&dip->pending_bios); | |
8260 | goto out_err; | |
8261 | } | |
8262 | ||
e65e1535 MX |
8263 | start_sector += submit_len >> 9; |
8264 | file_offset += submit_len; | |
8265 | ||
8266 | submit_len = 0; | |
8267 | nr_pages = 0; | |
8268 | ||
8269 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
8270 | start_sector, GFP_NOFS); | |
8271 | if (!bio) | |
8272 | goto out_err; | |
8273 | bio->bi_private = dip; | |
8274 | bio->bi_end_io = btrfs_end_dio_bio; | |
c1dc0896 | 8275 | btrfs_io_bio(bio)->logical = file_offset; |
e65e1535 | 8276 | |
4f024f37 | 8277 | map_length = orig_bio->bi_iter.bi_size; |
53b381b3 | 8278 | ret = btrfs_map_block(root->fs_info, rw, |
3ec706c8 | 8279 | start_sector << 9, |
e65e1535 MX |
8280 | &map_length, NULL, 0); |
8281 | if (ret) { | |
8282 | bio_put(bio); | |
8283 | goto out_err; | |
8284 | } | |
8285 | } else { | |
8286 | submit_len += bvec->bv_len; | |
67871254 | 8287 | nr_pages++; |
e65e1535 MX |
8288 | bvec++; |
8289 | } | |
8290 | } | |
8291 | ||
02f57c7a | 8292 | submit: |
e65e1535 | 8293 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
c329861d | 8294 | async_submit); |
e65e1535 MX |
8295 | if (!ret) |
8296 | return 0; | |
8297 | ||
8298 | bio_put(bio); | |
8299 | out_err: | |
8300 | dip->errors = 1; | |
8301 | /* | |
8302 | * before atomic variable goto zero, we must | |
8303 | * make sure dip->errors is perceived to be set. | |
8304 | */ | |
4e857c58 | 8305 | smp_mb__before_atomic(); |
e65e1535 MX |
8306 | if (atomic_dec_and_test(&dip->pending_bios)) |
8307 | bio_io_error(dip->orig_bio); | |
8308 | ||
8309 | /* bio_end_io() will handle error, so we needn't return it */ | |
8310 | return 0; | |
8311 | } | |
8312 | ||
9be3395b CM |
8313 | static void btrfs_submit_direct(int rw, struct bio *dio_bio, |
8314 | struct inode *inode, loff_t file_offset) | |
4b46fce2 | 8315 | { |
61de718f FM |
8316 | struct btrfs_dio_private *dip = NULL; |
8317 | struct bio *io_bio = NULL; | |
23ea8e5a | 8318 | struct btrfs_io_bio *btrfs_bio; |
4b46fce2 | 8319 | int skip_sum; |
7b6d91da | 8320 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
8321 | int ret = 0; |
8322 | ||
8323 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
8324 | ||
9be3395b | 8325 | io_bio = btrfs_bio_clone(dio_bio, GFP_NOFS); |
9be3395b CM |
8326 | if (!io_bio) { |
8327 | ret = -ENOMEM; | |
8328 | goto free_ordered; | |
8329 | } | |
8330 | ||
c1dc0896 | 8331 | dip = kzalloc(sizeof(*dip), GFP_NOFS); |
4b46fce2 JB |
8332 | if (!dip) { |
8333 | ret = -ENOMEM; | |
61de718f | 8334 | goto free_ordered; |
4b46fce2 | 8335 | } |
4b46fce2 | 8336 | |
9be3395b | 8337 | dip->private = dio_bio->bi_private; |
4b46fce2 JB |
8338 | dip->inode = inode; |
8339 | dip->logical_offset = file_offset; | |
4f024f37 KO |
8340 | dip->bytes = dio_bio->bi_iter.bi_size; |
8341 | dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9; | |
9be3395b | 8342 | io_bio->bi_private = dip; |
9be3395b CM |
8343 | dip->orig_bio = io_bio; |
8344 | dip->dio_bio = dio_bio; | |
e65e1535 | 8345 | atomic_set(&dip->pending_bios, 0); |
c1dc0896 MX |
8346 | btrfs_bio = btrfs_io_bio(io_bio); |
8347 | btrfs_bio->logical = file_offset; | |
4b46fce2 | 8348 | |
c1dc0896 | 8349 | if (write) { |
9be3395b | 8350 | io_bio->bi_end_io = btrfs_endio_direct_write; |
c1dc0896 | 8351 | } else { |
9be3395b | 8352 | io_bio->bi_end_io = btrfs_endio_direct_read; |
c1dc0896 MX |
8353 | dip->subio_endio = btrfs_subio_endio_read; |
8354 | } | |
4b46fce2 | 8355 | |
e65e1535 MX |
8356 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
8357 | if (!ret) | |
eaf25d93 | 8358 | return; |
9be3395b | 8359 | |
23ea8e5a MX |
8360 | if (btrfs_bio->end_io) |
8361 | btrfs_bio->end_io(btrfs_bio, ret); | |
9be3395b | 8362 | |
4b46fce2 JB |
8363 | free_ordered: |
8364 | /* | |
61de718f FM |
8365 | * If we arrived here it means either we failed to submit the dip |
8366 | * or we either failed to clone the dio_bio or failed to allocate the | |
8367 | * dip. If we cloned the dio_bio and allocated the dip, we can just | |
8368 | * call bio_endio against our io_bio so that we get proper resource | |
8369 | * cleanup if we fail to submit the dip, otherwise, we must do the | |
8370 | * same as btrfs_endio_direct_[write|read] because we can't call these | |
8371 | * callbacks - they require an allocated dip and a clone of dio_bio. | |
4b46fce2 | 8372 | */ |
61de718f | 8373 | if (io_bio && dip) { |
4246a0b6 CH |
8374 | io_bio->bi_error = -EIO; |
8375 | bio_endio(io_bio); | |
61de718f FM |
8376 | /* |
8377 | * The end io callbacks free our dip, do the final put on io_bio | |
8378 | * and all the cleanup and final put for dio_bio (through | |
8379 | * dio_end_io()). | |
8380 | */ | |
8381 | dip = NULL; | |
8382 | io_bio = NULL; | |
8383 | } else { | |
8384 | if (write) { | |
8385 | struct btrfs_ordered_extent *ordered; | |
8386 | ||
8387 | ordered = btrfs_lookup_ordered_extent(inode, | |
8388 | file_offset); | |
8389 | set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); | |
8390 | /* | |
8391 | * Decrements our ref on the ordered extent and removes | |
8392 | * the ordered extent from the inode's ordered tree, | |
8393 | * doing all the proper resource cleanup such as for the | |
8394 | * reserved space and waking up any waiters for this | |
8395 | * ordered extent (through btrfs_remove_ordered_extent). | |
8396 | */ | |
8397 | btrfs_finish_ordered_io(ordered); | |
8398 | } else { | |
8399 | unlock_extent(&BTRFS_I(inode)->io_tree, file_offset, | |
8400 | file_offset + dio_bio->bi_iter.bi_size - 1); | |
8401 | } | |
4246a0b6 | 8402 | dio_bio->bi_error = -EIO; |
61de718f FM |
8403 | /* |
8404 | * Releases and cleans up our dio_bio, no need to bio_put() | |
8405 | * nor bio_endio()/bio_io_error() against dio_bio. | |
8406 | */ | |
8407 | dio_end_io(dio_bio, ret); | |
4b46fce2 | 8408 | } |
61de718f FM |
8409 | if (io_bio) |
8410 | bio_put(io_bio); | |
8411 | kfree(dip); | |
4b46fce2 JB |
8412 | } |
8413 | ||
6f673763 | 8414 | static ssize_t check_direct_IO(struct btrfs_root *root, struct kiocb *iocb, |
28060d5d | 8415 | const struct iov_iter *iter, loff_t offset) |
5a5f79b5 CM |
8416 | { |
8417 | int seg; | |
a1b75f7d | 8418 | int i; |
5a5f79b5 CM |
8419 | unsigned blocksize_mask = root->sectorsize - 1; |
8420 | ssize_t retval = -EINVAL; | |
5a5f79b5 CM |
8421 | |
8422 | if (offset & blocksize_mask) | |
8423 | goto out; | |
8424 | ||
28060d5d AV |
8425 | if (iov_iter_alignment(iter) & blocksize_mask) |
8426 | goto out; | |
a1b75f7d | 8427 | |
28060d5d | 8428 | /* If this is a write we don't need to check anymore */ |
6f673763 | 8429 | if (iov_iter_rw(iter) == WRITE) |
28060d5d AV |
8430 | return 0; |
8431 | /* | |
8432 | * Check to make sure we don't have duplicate iov_base's in this | |
8433 | * iovec, if so return EINVAL, otherwise we'll get csum errors | |
8434 | * when reading back. | |
8435 | */ | |
8436 | for (seg = 0; seg < iter->nr_segs; seg++) { | |
8437 | for (i = seg + 1; i < iter->nr_segs; i++) { | |
8438 | if (iter->iov[seg].iov_base == iter->iov[i].iov_base) | |
a1b75f7d JB |
8439 | goto out; |
8440 | } | |
5a5f79b5 CM |
8441 | } |
8442 | retval = 0; | |
8443 | out: | |
8444 | return retval; | |
8445 | } | |
eb838e73 | 8446 | |
22c6186e OS |
8447 | static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter, |
8448 | loff_t offset) | |
16432985 | 8449 | { |
4b46fce2 JB |
8450 | struct file *file = iocb->ki_filp; |
8451 | struct inode *inode = file->f_mapping->host; | |
50745b0a | 8452 | struct btrfs_root *root = BTRFS_I(inode)->root; |
8453 | struct btrfs_dio_data dio_data = { 0 }; | |
0934856d | 8454 | size_t count = 0; |
2e60a51e | 8455 | int flags = 0; |
38851cc1 MX |
8456 | bool wakeup = true; |
8457 | bool relock = false; | |
0934856d | 8458 | ssize_t ret; |
4b46fce2 | 8459 | |
6f673763 | 8460 | if (check_direct_IO(BTRFS_I(inode)->root, iocb, iter, offset)) |
5a5f79b5 | 8461 | return 0; |
3f7c579c | 8462 | |
fe0f07d0 | 8463 | inode_dio_begin(inode); |
4e857c58 | 8464 | smp_mb__after_atomic(); |
38851cc1 | 8465 | |
0e267c44 | 8466 | /* |
41bd9ca4 MX |
8467 | * The generic stuff only does filemap_write_and_wait_range, which |
8468 | * isn't enough if we've written compressed pages to this area, so | |
8469 | * we need to flush the dirty pages again to make absolutely sure | |
8470 | * that any outstanding dirty pages are on disk. | |
0e267c44 | 8471 | */ |
a6cbcd4a | 8472 | count = iov_iter_count(iter); |
41bd9ca4 MX |
8473 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
8474 | &BTRFS_I(inode)->runtime_flags)) | |
9a025a08 WS |
8475 | filemap_fdatawrite_range(inode->i_mapping, offset, |
8476 | offset + count - 1); | |
0e267c44 | 8477 | |
6f673763 | 8478 | if (iov_iter_rw(iter) == WRITE) { |
38851cc1 MX |
8479 | /* |
8480 | * If the write DIO is beyond the EOF, we need update | |
8481 | * the isize, but it is protected by i_mutex. So we can | |
8482 | * not unlock the i_mutex at this case. | |
8483 | */ | |
8484 | if (offset + count <= inode->i_size) { | |
8485 | mutex_unlock(&inode->i_mutex); | |
8486 | relock = true; | |
8487 | } | |
7cf5b976 | 8488 | ret = btrfs_delalloc_reserve_space(inode, offset, count); |
0934856d | 8489 | if (ret) |
38851cc1 | 8490 | goto out; |
50745b0a | 8491 | dio_data.outstanding_extents = div64_u64(count + |
e1cbbfa5 JB |
8492 | BTRFS_MAX_EXTENT_SIZE - 1, |
8493 | BTRFS_MAX_EXTENT_SIZE); | |
8494 | ||
8495 | /* | |
8496 | * We need to know how many extents we reserved so that we can | |
8497 | * do the accounting properly if we go over the number we | |
8498 | * originally calculated. Abuse current->journal_info for this. | |
8499 | */ | |
50745b0a | 8500 | dio_data.reserve = round_up(count, root->sectorsize); |
8501 | current->journal_info = &dio_data; | |
ee39b432 DS |
8502 | } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK, |
8503 | &BTRFS_I(inode)->runtime_flags)) { | |
fe0f07d0 | 8504 | inode_dio_end(inode); |
38851cc1 MX |
8505 | flags = DIO_LOCKING | DIO_SKIP_HOLES; |
8506 | wakeup = false; | |
0934856d MX |
8507 | } |
8508 | ||
17f8c842 OS |
8509 | ret = __blockdev_direct_IO(iocb, inode, |
8510 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, | |
8511 | iter, offset, btrfs_get_blocks_direct, NULL, | |
8512 | btrfs_submit_direct, flags); | |
6f673763 | 8513 | if (iov_iter_rw(iter) == WRITE) { |
e1cbbfa5 | 8514 | current->journal_info = NULL; |
ddba1bfc | 8515 | if (ret < 0 && ret != -EIOCBQUEUED) { |
50745b0a | 8516 | if (dio_data.reserve) |
7cf5b976 QW |
8517 | btrfs_delalloc_release_space(inode, offset, |
8518 | dio_data.reserve); | |
ddba1bfc | 8519 | } else if (ret >= 0 && (size_t)ret < count) |
7cf5b976 QW |
8520 | btrfs_delalloc_release_space(inode, offset, |
8521 | count - (size_t)ret); | |
0934856d | 8522 | } |
38851cc1 | 8523 | out: |
2e60a51e | 8524 | if (wakeup) |
fe0f07d0 | 8525 | inode_dio_end(inode); |
38851cc1 MX |
8526 | if (relock) |
8527 | mutex_lock(&inode->i_mutex); | |
0934856d MX |
8528 | |
8529 | return ret; | |
16432985 CM |
8530 | } |
8531 | ||
05dadc09 TI |
8532 | #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC) |
8533 | ||
1506fcc8 YS |
8534 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
8535 | __u64 start, __u64 len) | |
8536 | { | |
05dadc09 TI |
8537 | int ret; |
8538 | ||
8539 | ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS); | |
8540 | if (ret) | |
8541 | return ret; | |
8542 | ||
ec29ed5b | 8543 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
1506fcc8 YS |
8544 | } |
8545 | ||
a52d9a80 | 8546 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 8547 | { |
d1310b2e CM |
8548 | struct extent_io_tree *tree; |
8549 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 8550 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
9ebefb18 | 8551 | } |
1832a6d5 | 8552 | |
a52d9a80 | 8553 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 8554 | { |
d1310b2e | 8555 | struct extent_io_tree *tree; |
b888db2b CM |
8556 | |
8557 | ||
8558 | if (current->flags & PF_MEMALLOC) { | |
8559 | redirty_page_for_writepage(wbc, page); | |
8560 | unlock_page(page); | |
8561 | return 0; | |
8562 | } | |
d1310b2e | 8563 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 8564 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
8565 | } |
8566 | ||
48a3b636 ES |
8567 | static int btrfs_writepages(struct address_space *mapping, |
8568 | struct writeback_control *wbc) | |
b293f02e | 8569 | { |
d1310b2e | 8570 | struct extent_io_tree *tree; |
771ed689 | 8571 | |
d1310b2e | 8572 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
8573 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
8574 | } | |
8575 | ||
3ab2fb5a CM |
8576 | static int |
8577 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
8578 | struct list_head *pages, unsigned nr_pages) | |
8579 | { | |
d1310b2e CM |
8580 | struct extent_io_tree *tree; |
8581 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
8582 | return extent_readpages(tree, mapping, pages, nr_pages, |
8583 | btrfs_get_extent); | |
8584 | } | |
e6dcd2dc | 8585 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 8586 | { |
d1310b2e CM |
8587 | struct extent_io_tree *tree; |
8588 | struct extent_map_tree *map; | |
a52d9a80 | 8589 | int ret; |
8c2383c3 | 8590 | |
d1310b2e CM |
8591 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
8592 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 8593 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
8594 | if (ret == 1) { |
8595 | ClearPagePrivate(page); | |
8596 | set_page_private(page, 0); | |
8597 | page_cache_release(page); | |
39279cc3 | 8598 | } |
a52d9a80 | 8599 | return ret; |
39279cc3 CM |
8600 | } |
8601 | ||
e6dcd2dc CM |
8602 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
8603 | { | |
98509cfc CM |
8604 | if (PageWriteback(page) || PageDirty(page)) |
8605 | return 0; | |
b335b003 | 8606 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
8607 | } |
8608 | ||
d47992f8 LC |
8609 | static void btrfs_invalidatepage(struct page *page, unsigned int offset, |
8610 | unsigned int length) | |
39279cc3 | 8611 | { |
5fd02043 | 8612 | struct inode *inode = page->mapping->host; |
d1310b2e | 8613 | struct extent_io_tree *tree; |
e6dcd2dc | 8614 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 8615 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8616 | u64 page_start = page_offset(page); |
8617 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
131e404a | 8618 | int inode_evicting = inode->i_state & I_FREEING; |
39279cc3 | 8619 | |
8b62b72b CM |
8620 | /* |
8621 | * we have the page locked, so new writeback can't start, | |
8622 | * and the dirty bit won't be cleared while we are here. | |
8623 | * | |
8624 | * Wait for IO on this page so that we can safely clear | |
8625 | * the PagePrivate2 bit and do ordered accounting | |
8626 | */ | |
e6dcd2dc | 8627 | wait_on_page_writeback(page); |
8b62b72b | 8628 | |
5fd02043 | 8629 | tree = &BTRFS_I(inode)->io_tree; |
e6dcd2dc CM |
8630 | if (offset) { |
8631 | btrfs_releasepage(page, GFP_NOFS); | |
8632 | return; | |
8633 | } | |
131e404a FDBM |
8634 | |
8635 | if (!inode_evicting) | |
8636 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state); | |
8637 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
e6dcd2dc | 8638 | if (ordered) { |
eb84ae03 CM |
8639 | /* |
8640 | * IO on this page will never be started, so we need | |
8641 | * to account for any ordered extents now | |
8642 | */ | |
131e404a FDBM |
8643 | if (!inode_evicting) |
8644 | clear_extent_bit(tree, page_start, page_end, | |
8645 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
8646 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | | |
8647 | EXTENT_DEFRAG, 1, 0, &cached_state, | |
8648 | GFP_NOFS); | |
8b62b72b CM |
8649 | /* |
8650 | * whoever cleared the private bit is responsible | |
8651 | * for the finish_ordered_io | |
8652 | */ | |
77cef2ec JB |
8653 | if (TestClearPagePrivate2(page)) { |
8654 | struct btrfs_ordered_inode_tree *tree; | |
8655 | u64 new_len; | |
8656 | ||
8657 | tree = &BTRFS_I(inode)->ordered_tree; | |
8658 | ||
8659 | spin_lock_irq(&tree->lock); | |
8660 | set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags); | |
8661 | new_len = page_start - ordered->file_offset; | |
8662 | if (new_len < ordered->truncated_len) | |
8663 | ordered->truncated_len = new_len; | |
8664 | spin_unlock_irq(&tree->lock); | |
8665 | ||
8666 | if (btrfs_dec_test_ordered_pending(inode, &ordered, | |
8667 | page_start, | |
8668 | PAGE_CACHE_SIZE, 1)) | |
8669 | btrfs_finish_ordered_io(ordered); | |
8b62b72b | 8670 | } |
e6dcd2dc | 8671 | btrfs_put_ordered_extent(ordered); |
131e404a FDBM |
8672 | if (!inode_evicting) { |
8673 | cached_state = NULL; | |
8674 | lock_extent_bits(tree, page_start, page_end, 0, | |
8675 | &cached_state); | |
8676 | } | |
8677 | } | |
8678 | ||
b9d0b389 QW |
8679 | /* |
8680 | * Qgroup reserved space handler | |
8681 | * Page here will be either | |
8682 | * 1) Already written to disk | |
8683 | * In this case, its reserved space is released from data rsv map | |
8684 | * and will be freed by delayed_ref handler finally. | |
8685 | * So even we call qgroup_free_data(), it won't decrease reserved | |
8686 | * space. | |
8687 | * 2) Not written to disk | |
8688 | * This means the reserved space should be freed here. | |
8689 | */ | |
8690 | btrfs_qgroup_free_data(inode, page_start, PAGE_CACHE_SIZE); | |
131e404a FDBM |
8691 | if (!inode_evicting) { |
8692 | clear_extent_bit(tree, page_start, page_end, | |
8693 | EXTENT_LOCKED | EXTENT_DIRTY | | |
8694 | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | | |
8695 | EXTENT_DEFRAG, 1, 1, | |
8696 | &cached_state, GFP_NOFS); | |
8697 | ||
8698 | __btrfs_releasepage(page, GFP_NOFS); | |
e6dcd2dc | 8699 | } |
e6dcd2dc | 8700 | |
4a096752 | 8701 | ClearPageChecked(page); |
9ad6b7bc | 8702 | if (PagePrivate(page)) { |
9ad6b7bc CM |
8703 | ClearPagePrivate(page); |
8704 | set_page_private(page, 0); | |
8705 | page_cache_release(page); | |
8706 | } | |
39279cc3 CM |
8707 | } |
8708 | ||
9ebefb18 CM |
8709 | /* |
8710 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
8711 | * called from a page fault handler when a page is first dirtied. Hence we must | |
8712 | * be careful to check for EOF conditions here. We set the page up correctly | |
8713 | * for a written page which means we get ENOSPC checking when writing into | |
8714 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
8715 | * support these features. | |
8716 | * | |
8717 | * We are not allowed to take the i_mutex here so we have to play games to | |
8718 | * protect against truncate races as the page could now be beyond EOF. Because | |
8719 | * vmtruncate() writes the inode size before removing pages, once we have the | |
8720 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
8721 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
8722 | * unlock the page. | |
8723 | */ | |
c2ec175c | 8724 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 8725 | { |
c2ec175c | 8726 | struct page *page = vmf->page; |
496ad9aa | 8727 | struct inode *inode = file_inode(vma->vm_file); |
1832a6d5 | 8728 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
8729 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
8730 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 8731 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
8732 | char *kaddr; |
8733 | unsigned long zero_start; | |
9ebefb18 | 8734 | loff_t size; |
1832a6d5 | 8735 | int ret; |
9998eb70 | 8736 | int reserved = 0; |
a52d9a80 | 8737 | u64 page_start; |
e6dcd2dc | 8738 | u64 page_end; |
9ebefb18 | 8739 | |
b2b5ef5c | 8740 | sb_start_pagefault(inode->i_sb); |
df480633 QW |
8741 | page_start = page_offset(page); |
8742 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
8743 | ||
7cf5b976 QW |
8744 | ret = btrfs_delalloc_reserve_space(inode, page_start, |
8745 | PAGE_CACHE_SIZE); | |
9998eb70 | 8746 | if (!ret) { |
e41f941a | 8747 | ret = file_update_time(vma->vm_file); |
9998eb70 CM |
8748 | reserved = 1; |
8749 | } | |
56a76f82 NP |
8750 | if (ret) { |
8751 | if (ret == -ENOMEM) | |
8752 | ret = VM_FAULT_OOM; | |
8753 | else /* -ENOSPC, -EIO, etc */ | |
8754 | ret = VM_FAULT_SIGBUS; | |
9998eb70 CM |
8755 | if (reserved) |
8756 | goto out; | |
8757 | goto out_noreserve; | |
56a76f82 | 8758 | } |
1832a6d5 | 8759 | |
56a76f82 | 8760 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 8761 | again: |
9ebefb18 | 8762 | lock_page(page); |
9ebefb18 | 8763 | size = i_size_read(inode); |
a52d9a80 | 8764 | |
9ebefb18 | 8765 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 8766 | (page_start >= size)) { |
9ebefb18 CM |
8767 | /* page got truncated out from underneath us */ |
8768 | goto out_unlock; | |
8769 | } | |
e6dcd2dc CM |
8770 | wait_on_page_writeback(page); |
8771 | ||
d0082371 | 8772 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
8773 | set_page_extent_mapped(page); |
8774 | ||
eb84ae03 CM |
8775 | /* |
8776 | * we can't set the delalloc bits if there are pending ordered | |
8777 | * extents. Drop our locks and wait for them to finish | |
8778 | */ | |
e6dcd2dc CM |
8779 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
8780 | if (ordered) { | |
2ac55d41 JB |
8781 | unlock_extent_cached(io_tree, page_start, page_end, |
8782 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 8783 | unlock_page(page); |
eb84ae03 | 8784 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
8785 | btrfs_put_ordered_extent(ordered); |
8786 | goto again; | |
8787 | } | |
8788 | ||
fbf19087 JB |
8789 | /* |
8790 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
8791 | * if it was already dirty, so for space accounting reasons we need to | |
8792 | * clear any delalloc bits for the range we are fixing to save. There | |
8793 | * is probably a better way to do this, but for now keep consistent with | |
8794 | * prepare_pages in the normal write path. | |
8795 | */ | |
2ac55d41 | 8796 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
8797 | EXTENT_DIRTY | EXTENT_DELALLOC | |
8798 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 8799 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 8800 | |
2ac55d41 JB |
8801 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
8802 | &cached_state); | |
9ed74f2d | 8803 | if (ret) { |
2ac55d41 JB |
8804 | unlock_extent_cached(io_tree, page_start, page_end, |
8805 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
8806 | ret = VM_FAULT_SIGBUS; |
8807 | goto out_unlock; | |
8808 | } | |
e6dcd2dc | 8809 | ret = 0; |
9ebefb18 CM |
8810 | |
8811 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 8812 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 8813 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 8814 | else |
e6dcd2dc | 8815 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 8816 | |
e6dcd2dc CM |
8817 | if (zero_start != PAGE_CACHE_SIZE) { |
8818 | kaddr = kmap(page); | |
8819 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
8820 | flush_dcache_page(page); | |
8821 | kunmap(page); | |
8822 | } | |
247e743c | 8823 | ClearPageChecked(page); |
e6dcd2dc | 8824 | set_page_dirty(page); |
50a9b214 | 8825 | SetPageUptodate(page); |
5a3f23d5 | 8826 | |
257c62e1 CM |
8827 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
8828 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
46d8bc34 | 8829 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
257c62e1 | 8830 | |
2ac55d41 | 8831 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
8832 | |
8833 | out_unlock: | |
b2b5ef5c JK |
8834 | if (!ret) { |
8835 | sb_end_pagefault(inode->i_sb); | |
50a9b214 | 8836 | return VM_FAULT_LOCKED; |
b2b5ef5c | 8837 | } |
9ebefb18 | 8838 | unlock_page(page); |
1832a6d5 | 8839 | out: |
7cf5b976 | 8840 | btrfs_delalloc_release_space(inode, page_start, PAGE_CACHE_SIZE); |
9998eb70 | 8841 | out_noreserve: |
b2b5ef5c | 8842 | sb_end_pagefault(inode->i_sb); |
9ebefb18 CM |
8843 | return ret; |
8844 | } | |
8845 | ||
a41ad394 | 8846 | static int btrfs_truncate(struct inode *inode) |
39279cc3 CM |
8847 | { |
8848 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
fcb80c2a | 8849 | struct btrfs_block_rsv *rsv; |
a71754fc | 8850 | int ret = 0; |
3893e33b | 8851 | int err = 0; |
39279cc3 | 8852 | struct btrfs_trans_handle *trans; |
dbe674a9 | 8853 | u64 mask = root->sectorsize - 1; |
07127184 | 8854 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 | 8855 | |
0ef8b726 JB |
8856 | ret = btrfs_wait_ordered_range(inode, inode->i_size & (~mask), |
8857 | (u64)-1); | |
8858 | if (ret) | |
8859 | return ret; | |
39279cc3 | 8860 | |
fcb80c2a JB |
8861 | /* |
8862 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have | |
8863 | * 3 things going on here | |
8864 | * | |
8865 | * 1) We need to reserve space for our orphan item and the space to | |
8866 | * delete our orphan item. Lord knows we don't want to have a dangling | |
8867 | * orphan item because we didn't reserve space to remove it. | |
8868 | * | |
8869 | * 2) We need to reserve space to update our inode. | |
8870 | * | |
8871 | * 3) We need to have something to cache all the space that is going to | |
8872 | * be free'd up by the truncate operation, but also have some slack | |
8873 | * space reserved in case it uses space during the truncate (thank you | |
8874 | * very much snapshotting). | |
8875 | * | |
8876 | * And we need these to all be seperate. The fact is we can use alot of | |
8877 | * space doing the truncate, and we have no earthly idea how much space | |
8878 | * we will use, so we need the truncate reservation to be seperate so it | |
8879 | * doesn't end up using space reserved for updating the inode or | |
8880 | * removing the orphan item. We also need to be able to stop the | |
8881 | * transaction and start a new one, which means we need to be able to | |
8882 | * update the inode several times, and we have no idea of knowing how | |
8883 | * many times that will be, so we can't just reserve 1 item for the | |
8884 | * entirety of the opration, so that has to be done seperately as well. | |
8885 | * Then there is the orphan item, which does indeed need to be held on | |
8886 | * to for the whole operation, and we need nobody to touch this reserved | |
8887 | * space except the orphan code. | |
8888 | * | |
8889 | * So that leaves us with | |
8890 | * | |
8891 | * 1) root->orphan_block_rsv - for the orphan deletion. | |
8892 | * 2) rsv - for the truncate reservation, which we will steal from the | |
8893 | * transaction reservation. | |
8894 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for | |
8895 | * updating the inode. | |
8896 | */ | |
66d8f3dd | 8897 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
fcb80c2a JB |
8898 | if (!rsv) |
8899 | return -ENOMEM; | |
4a338542 | 8900 | rsv->size = min_size; |
ca7e70f5 | 8901 | rsv->failfast = 1; |
f0cd846e | 8902 | |
907cbceb | 8903 | /* |
07127184 | 8904 | * 1 for the truncate slack space |
907cbceb JB |
8905 | * 1 for updating the inode. |
8906 | */ | |
f3fe820c | 8907 | trans = btrfs_start_transaction(root, 2); |
fcb80c2a JB |
8908 | if (IS_ERR(trans)) { |
8909 | err = PTR_ERR(trans); | |
8910 | goto out; | |
8911 | } | |
f0cd846e | 8912 | |
907cbceb JB |
8913 | /* Migrate the slack space for the truncate to our reserve */ |
8914 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
8915 | min_size); | |
fcb80c2a | 8916 | BUG_ON(ret); |
f0cd846e | 8917 | |
5dc562c5 JB |
8918 | /* |
8919 | * So if we truncate and then write and fsync we normally would just | |
8920 | * write the extents that changed, which is a problem if we need to | |
8921 | * first truncate that entire inode. So set this flag so we write out | |
8922 | * all of the extents in the inode to the sync log so we're completely | |
8923 | * safe. | |
8924 | */ | |
8925 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
ca7e70f5 | 8926 | trans->block_rsv = rsv; |
907cbceb | 8927 | |
8082510e YZ |
8928 | while (1) { |
8929 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
8930 | inode->i_size, | |
8931 | BTRFS_EXTENT_DATA_KEY); | |
28ed1345 | 8932 | if (ret != -ENOSPC && ret != -EAGAIN) { |
3893e33b | 8933 | err = ret; |
8082510e | 8934 | break; |
3893e33b | 8935 | } |
39279cc3 | 8936 | |
fcb80c2a | 8937 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e | 8938 | ret = btrfs_update_inode(trans, root, inode); |
3893e33b JB |
8939 | if (ret) { |
8940 | err = ret; | |
8941 | break; | |
8942 | } | |
ca7e70f5 | 8943 | |
8082510e | 8944 | btrfs_end_transaction(trans, root); |
b53d3f5d | 8945 | btrfs_btree_balance_dirty(root); |
ca7e70f5 JB |
8946 | |
8947 | trans = btrfs_start_transaction(root, 2); | |
8948 | if (IS_ERR(trans)) { | |
8949 | ret = err = PTR_ERR(trans); | |
8950 | trans = NULL; | |
8951 | break; | |
8952 | } | |
8953 | ||
8954 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
8955 | rsv, min_size); | |
8956 | BUG_ON(ret); /* shouldn't happen */ | |
8957 | trans->block_rsv = rsv; | |
8082510e YZ |
8958 | } |
8959 | ||
8960 | if (ret == 0 && inode->i_nlink > 0) { | |
fcb80c2a | 8961 | trans->block_rsv = root->orphan_block_rsv; |
8082510e | 8962 | ret = btrfs_orphan_del(trans, inode); |
3893e33b JB |
8963 | if (ret) |
8964 | err = ret; | |
8082510e YZ |
8965 | } |
8966 | ||
917c16b2 CM |
8967 | if (trans) { |
8968 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
8969 | ret = btrfs_update_inode(trans, root, inode); | |
8970 | if (ret && !err) | |
8971 | err = ret; | |
7b128766 | 8972 | |
7ad85bb7 | 8973 | ret = btrfs_end_transaction(trans, root); |
b53d3f5d | 8974 | btrfs_btree_balance_dirty(root); |
917c16b2 | 8975 | } |
fcb80c2a JB |
8976 | |
8977 | out: | |
8978 | btrfs_free_block_rsv(root, rsv); | |
8979 | ||
3893e33b JB |
8980 | if (ret && !err) |
8981 | err = ret; | |
a41ad394 | 8982 | |
3893e33b | 8983 | return err; |
39279cc3 CM |
8984 | } |
8985 | ||
d352ac68 CM |
8986 | /* |
8987 | * create a new subvolume directory/inode (helper for the ioctl). | |
8988 | */ | |
d2fb3437 | 8989 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
63541927 FDBM |
8990 | struct btrfs_root *new_root, |
8991 | struct btrfs_root *parent_root, | |
8992 | u64 new_dirid) | |
39279cc3 | 8993 | { |
39279cc3 | 8994 | struct inode *inode; |
76dda93c | 8995 | int err; |
00e4e6b3 | 8996 | u64 index = 0; |
39279cc3 | 8997 | |
12fc9d09 FA |
8998 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
8999 | new_dirid, new_dirid, | |
9000 | S_IFDIR | (~current_umask() & S_IRWXUGO), | |
9001 | &index); | |
54aa1f4d | 9002 | if (IS_ERR(inode)) |
f46b5a66 | 9003 | return PTR_ERR(inode); |
39279cc3 CM |
9004 | inode->i_op = &btrfs_dir_inode_operations; |
9005 | inode->i_fop = &btrfs_dir_file_operations; | |
9006 | ||
bfe86848 | 9007 | set_nlink(inode, 1); |
dbe674a9 | 9008 | btrfs_i_size_write(inode, 0); |
b0d5d10f | 9009 | unlock_new_inode(inode); |
3b96362c | 9010 | |
63541927 FDBM |
9011 | err = btrfs_subvol_inherit_props(trans, new_root, parent_root); |
9012 | if (err) | |
9013 | btrfs_err(new_root->fs_info, | |
351fd353 | 9014 | "error inheriting subvolume %llu properties: %d", |
63541927 FDBM |
9015 | new_root->root_key.objectid, err); |
9016 | ||
76dda93c | 9017 | err = btrfs_update_inode(trans, new_root, inode); |
cb8e7090 | 9018 | |
76dda93c | 9019 | iput(inode); |
ce598979 | 9020 | return err; |
39279cc3 CM |
9021 | } |
9022 | ||
39279cc3 CM |
9023 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
9024 | { | |
9025 | struct btrfs_inode *ei; | |
2ead6ae7 | 9026 | struct inode *inode; |
39279cc3 CM |
9027 | |
9028 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
9029 | if (!ei) | |
9030 | return NULL; | |
2ead6ae7 YZ |
9031 | |
9032 | ei->root = NULL; | |
2ead6ae7 | 9033 | ei->generation = 0; |
15ee9bc7 | 9034 | ei->last_trans = 0; |
257c62e1 | 9035 | ei->last_sub_trans = 0; |
e02119d5 | 9036 | ei->logged_trans = 0; |
2ead6ae7 | 9037 | ei->delalloc_bytes = 0; |
47059d93 | 9038 | ei->defrag_bytes = 0; |
2ead6ae7 YZ |
9039 | ei->disk_i_size = 0; |
9040 | ei->flags = 0; | |
7709cde3 | 9041 | ei->csum_bytes = 0; |
2ead6ae7 | 9042 | ei->index_cnt = (u64)-1; |
67de1176 | 9043 | ei->dir_index = 0; |
2ead6ae7 | 9044 | ei->last_unlink_trans = 0; |
46d8bc34 | 9045 | ei->last_log_commit = 0; |
2ead6ae7 | 9046 | |
9e0baf60 JB |
9047 | spin_lock_init(&ei->lock); |
9048 | ei->outstanding_extents = 0; | |
9049 | ei->reserved_extents = 0; | |
2ead6ae7 | 9050 | |
72ac3c0d | 9051 | ei->runtime_flags = 0; |
261507a0 | 9052 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 | 9053 | |
16cdcec7 MX |
9054 | ei->delayed_node = NULL; |
9055 | ||
9cc97d64 | 9056 | ei->i_otime.tv_sec = 0; |
9057 | ei->i_otime.tv_nsec = 0; | |
9058 | ||
2ead6ae7 | 9059 | inode = &ei->vfs_inode; |
a8067e02 | 9060 | extent_map_tree_init(&ei->extent_tree); |
f993c883 DS |
9061 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
9062 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); | |
0b32f4bb JB |
9063 | ei->io_tree.track_uptodate = 1; |
9064 | ei->io_failure_tree.track_uptodate = 1; | |
b812ce28 | 9065 | atomic_set(&ei->sync_writers, 0); |
2ead6ae7 | 9066 | mutex_init(&ei->log_mutex); |
f248679e | 9067 | mutex_init(&ei->delalloc_mutex); |
e6dcd2dc | 9068 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
2ead6ae7 | 9069 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
2ead6ae7 YZ |
9070 | RB_CLEAR_NODE(&ei->rb_node); |
9071 | ||
9072 | return inode; | |
39279cc3 CM |
9073 | } |
9074 | ||
aaedb55b JB |
9075 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
9076 | void btrfs_test_destroy_inode(struct inode *inode) | |
9077 | { | |
9078 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); | |
9079 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
9080 | } | |
9081 | #endif | |
9082 | ||
fa0d7e3d NP |
9083 | static void btrfs_i_callback(struct rcu_head *head) |
9084 | { | |
9085 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
9086 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
9087 | } | |
9088 | ||
39279cc3 CM |
9089 | void btrfs_destroy_inode(struct inode *inode) |
9090 | { | |
e6dcd2dc | 9091 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
9092 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9093 | ||
b3d9b7a3 | 9094 | WARN_ON(!hlist_empty(&inode->i_dentry)); |
39279cc3 | 9095 | WARN_ON(inode->i_data.nrpages); |
9e0baf60 JB |
9096 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
9097 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
7709cde3 JB |
9098 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
9099 | WARN_ON(BTRFS_I(inode)->csum_bytes); | |
47059d93 | 9100 | WARN_ON(BTRFS_I(inode)->defrag_bytes); |
39279cc3 | 9101 | |
a6dbd429 JB |
9102 | /* |
9103 | * This can happen where we create an inode, but somebody else also | |
9104 | * created the same inode and we need to destroy the one we already | |
9105 | * created. | |
9106 | */ | |
9107 | if (!root) | |
9108 | goto free; | |
9109 | ||
8a35d95f JB |
9110 | if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
9111 | &BTRFS_I(inode)->runtime_flags)) { | |
c2cf52eb | 9112 | btrfs_info(root->fs_info, "inode %llu still on the orphan list", |
c1c9ff7c | 9113 | btrfs_ino(inode)); |
8a35d95f | 9114 | atomic_dec(&root->orphan_inodes); |
7b128766 | 9115 | } |
7b128766 | 9116 | |
d397712b | 9117 | while (1) { |
e6dcd2dc CM |
9118 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
9119 | if (!ordered) | |
9120 | break; | |
9121 | else { | |
c2cf52eb | 9122 | btrfs_err(root->fs_info, "found ordered extent %llu %llu on inode cleanup", |
c1c9ff7c | 9123 | ordered->file_offset, ordered->len); |
e6dcd2dc CM |
9124 | btrfs_remove_ordered_extent(inode, ordered); |
9125 | btrfs_put_ordered_extent(ordered); | |
9126 | btrfs_put_ordered_extent(ordered); | |
9127 | } | |
9128 | } | |
56fa9d07 | 9129 | btrfs_qgroup_check_reserved_leak(inode); |
5d4f98a2 | 9130 | inode_tree_del(inode); |
5b21f2ed | 9131 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 9132 | free: |
fa0d7e3d | 9133 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
9134 | } |
9135 | ||
45321ac5 | 9136 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
9137 | { |
9138 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 9139 | |
6379ef9f NA |
9140 | if (root == NULL) |
9141 | return 1; | |
9142 | ||
fa6ac876 | 9143 | /* the snap/subvol tree is on deleting */ |
69e9c6c6 | 9144 | if (btrfs_root_refs(&root->root_item) == 0) |
45321ac5 | 9145 | return 1; |
76dda93c | 9146 | else |
45321ac5 | 9147 | return generic_drop_inode(inode); |
76dda93c YZ |
9148 | } |
9149 | ||
0ee0fda0 | 9150 | static void init_once(void *foo) |
39279cc3 CM |
9151 | { |
9152 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
9153 | ||
9154 | inode_init_once(&ei->vfs_inode); | |
9155 | } | |
9156 | ||
9157 | void btrfs_destroy_cachep(void) | |
9158 | { | |
8c0a8537 KS |
9159 | /* |
9160 | * Make sure all delayed rcu free inodes are flushed before we | |
9161 | * destroy cache. | |
9162 | */ | |
9163 | rcu_barrier(); | |
39279cc3 CM |
9164 | if (btrfs_inode_cachep) |
9165 | kmem_cache_destroy(btrfs_inode_cachep); | |
9166 | if (btrfs_trans_handle_cachep) | |
9167 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
9168 | if (btrfs_transaction_cachep) | |
9169 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
9170 | if (btrfs_path_cachep) |
9171 | kmem_cache_destroy(btrfs_path_cachep); | |
dc89e982 JB |
9172 | if (btrfs_free_space_cachep) |
9173 | kmem_cache_destroy(btrfs_free_space_cachep); | |
8ccf6f19 MX |
9174 | if (btrfs_delalloc_work_cachep) |
9175 | kmem_cache_destroy(btrfs_delalloc_work_cachep); | |
39279cc3 CM |
9176 | } |
9177 | ||
9178 | int btrfs_init_cachep(void) | |
9179 | { | |
837e1972 | 9180 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode", |
9601e3f6 CH |
9181 | sizeof(struct btrfs_inode), 0, |
9182 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
9183 | if (!btrfs_inode_cachep) |
9184 | goto fail; | |
9601e3f6 | 9185 | |
837e1972 | 9186 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle", |
9601e3f6 CH |
9187 | sizeof(struct btrfs_trans_handle), 0, |
9188 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9189 | if (!btrfs_trans_handle_cachep) |
9190 | goto fail; | |
9601e3f6 | 9191 | |
837e1972 | 9192 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction", |
9601e3f6 CH |
9193 | sizeof(struct btrfs_transaction), 0, |
9194 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9195 | if (!btrfs_transaction_cachep) |
9196 | goto fail; | |
9601e3f6 | 9197 | |
837e1972 | 9198 | btrfs_path_cachep = kmem_cache_create("btrfs_path", |
9601e3f6 CH |
9199 | sizeof(struct btrfs_path), 0, |
9200 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
9201 | if (!btrfs_path_cachep) |
9202 | goto fail; | |
9601e3f6 | 9203 | |
837e1972 | 9204 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space", |
dc89e982 JB |
9205 | sizeof(struct btrfs_free_space), 0, |
9206 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
9207 | if (!btrfs_free_space_cachep) | |
9208 | goto fail; | |
9209 | ||
8ccf6f19 MX |
9210 | btrfs_delalloc_work_cachep = kmem_cache_create("btrfs_delalloc_work", |
9211 | sizeof(struct btrfs_delalloc_work), 0, | |
9212 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
9213 | NULL); | |
9214 | if (!btrfs_delalloc_work_cachep) | |
9215 | goto fail; | |
9216 | ||
39279cc3 CM |
9217 | return 0; |
9218 | fail: | |
9219 | btrfs_destroy_cachep(); | |
9220 | return -ENOMEM; | |
9221 | } | |
9222 | ||
9223 | static int btrfs_getattr(struct vfsmount *mnt, | |
9224 | struct dentry *dentry, struct kstat *stat) | |
9225 | { | |
df0af1a5 | 9226 | u64 delalloc_bytes; |
2b0143b5 | 9227 | struct inode *inode = d_inode(dentry); |
fadc0d8b DS |
9228 | u32 blocksize = inode->i_sb->s_blocksize; |
9229 | ||
39279cc3 | 9230 | generic_fillattr(inode, stat); |
0ee5dc67 | 9231 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
d6667462 | 9232 | stat->blksize = PAGE_CACHE_SIZE; |
df0af1a5 MX |
9233 | |
9234 | spin_lock(&BTRFS_I(inode)->lock); | |
9235 | delalloc_bytes = BTRFS_I(inode)->delalloc_bytes; | |
9236 | spin_unlock(&BTRFS_I(inode)->lock); | |
fadc0d8b | 9237 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
df0af1a5 | 9238 | ALIGN(delalloc_bytes, blocksize)) >> 9; |
39279cc3 CM |
9239 | return 0; |
9240 | } | |
9241 | ||
d397712b CM |
9242 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
9243 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
9244 | { |
9245 | struct btrfs_trans_handle *trans; | |
9246 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 9247 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
2b0143b5 DH |
9248 | struct inode *new_inode = d_inode(new_dentry); |
9249 | struct inode *old_inode = d_inode(old_dentry); | |
39279cc3 | 9250 | struct timespec ctime = CURRENT_TIME; |
00e4e6b3 | 9251 | u64 index = 0; |
4df27c4d | 9252 | u64 root_objectid; |
39279cc3 | 9253 | int ret; |
33345d01 | 9254 | u64 old_ino = btrfs_ino(old_inode); |
39279cc3 | 9255 | |
33345d01 | 9256 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
f679a840 YZ |
9257 | return -EPERM; |
9258 | ||
4df27c4d | 9259 | /* we only allow rename subvolume link between subvolumes */ |
33345d01 | 9260 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
3394e160 CM |
9261 | return -EXDEV; |
9262 | ||
33345d01 LZ |
9263 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
9264 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 9265 | return -ENOTEMPTY; |
5f39d397 | 9266 | |
4df27c4d YZ |
9267 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
9268 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
9269 | return -ENOTEMPTY; | |
9c52057c CM |
9270 | |
9271 | ||
9272 | /* check for collisions, even if the name isn't there */ | |
4871c158 | 9273 | ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, |
9c52057c CM |
9274 | new_dentry->d_name.name, |
9275 | new_dentry->d_name.len); | |
9276 | ||
9277 | if (ret) { | |
9278 | if (ret == -EEXIST) { | |
9279 | /* we shouldn't get | |
9280 | * eexist without a new_inode */ | |
fae7f21c | 9281 | if (WARN_ON(!new_inode)) { |
9c52057c CM |
9282 | return ret; |
9283 | } | |
9284 | } else { | |
9285 | /* maybe -EOVERFLOW */ | |
9286 | return ret; | |
9287 | } | |
9288 | } | |
9289 | ret = 0; | |
9290 | ||
5a3f23d5 | 9291 | /* |
8d875f95 CM |
9292 | * we're using rename to replace one file with another. Start IO on it |
9293 | * now so we don't add too much work to the end of the transaction | |
5a3f23d5 | 9294 | */ |
8d875f95 | 9295 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size) |
5a3f23d5 CM |
9296 | filemap_flush(old_inode->i_mapping); |
9297 | ||
76dda93c | 9298 | /* close the racy window with snapshot create/destroy ioctl */ |
33345d01 | 9299 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9300 | down_read(&root->fs_info->subvol_sem); |
a22285a6 YZ |
9301 | /* |
9302 | * We want to reserve the absolute worst case amount of items. So if | |
9303 | * both inodes are subvols and we need to unlink them then that would | |
9304 | * require 4 item modifications, but if they are both normal inodes it | |
9305 | * would require 5 item modifications, so we'll assume their normal | |
9306 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
9307 | * should cover the worst case number of items we'll modify. | |
9308 | */ | |
6e137ed3 | 9309 | trans = btrfs_start_transaction(root, 11); |
b44c59a8 JL |
9310 | if (IS_ERR(trans)) { |
9311 | ret = PTR_ERR(trans); | |
9312 | goto out_notrans; | |
9313 | } | |
76dda93c | 9314 | |
4df27c4d YZ |
9315 | if (dest != root) |
9316 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 9317 | |
a5719521 YZ |
9318 | ret = btrfs_set_inode_index(new_dir, &index); |
9319 | if (ret) | |
9320 | goto out_fail; | |
5a3f23d5 | 9321 | |
67de1176 | 9322 | BTRFS_I(old_inode)->dir_index = 0ULL; |
33345d01 | 9323 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d | 9324 | /* force full log commit if subvolume involved. */ |
995946dd | 9325 | btrfs_set_log_full_commit(root->fs_info, trans); |
4df27c4d | 9326 | } else { |
a5719521 YZ |
9327 | ret = btrfs_insert_inode_ref(trans, dest, |
9328 | new_dentry->d_name.name, | |
9329 | new_dentry->d_name.len, | |
33345d01 LZ |
9330 | old_ino, |
9331 | btrfs_ino(new_dir), index); | |
a5719521 YZ |
9332 | if (ret) |
9333 | goto out_fail; | |
4df27c4d YZ |
9334 | /* |
9335 | * this is an ugly little race, but the rename is required | |
9336 | * to make sure that if we crash, the inode is either at the | |
9337 | * old name or the new one. pinning the log transaction lets | |
9338 | * us make sure we don't allow a log commit to come in after | |
9339 | * we unlink the name but before we add the new name back in. | |
9340 | */ | |
9341 | btrfs_pin_log_trans(root); | |
9342 | } | |
5a3f23d5 | 9343 | |
0c4d2d95 JB |
9344 | inode_inc_iversion(old_dir); |
9345 | inode_inc_iversion(new_dir); | |
9346 | inode_inc_iversion(old_inode); | |
39279cc3 CM |
9347 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
9348 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
9349 | old_inode->i_ctime = ctime; | |
5f39d397 | 9350 | |
12fcfd22 CM |
9351 | if (old_dentry->d_parent != new_dentry->d_parent) |
9352 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
9353 | ||
33345d01 | 9354 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
9355 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
9356 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
9357 | old_dentry->d_name.name, | |
9358 | old_dentry->d_name.len); | |
9359 | } else { | |
92986796 | 9360 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
2b0143b5 | 9361 | d_inode(old_dentry), |
92986796 AV |
9362 | old_dentry->d_name.name, |
9363 | old_dentry->d_name.len); | |
9364 | if (!ret) | |
9365 | ret = btrfs_update_inode(trans, root, old_inode); | |
4df27c4d | 9366 | } |
79787eaa JM |
9367 | if (ret) { |
9368 | btrfs_abort_transaction(trans, root, ret); | |
9369 | goto out_fail; | |
9370 | } | |
39279cc3 CM |
9371 | |
9372 | if (new_inode) { | |
0c4d2d95 | 9373 | inode_inc_iversion(new_inode); |
39279cc3 | 9374 | new_inode->i_ctime = CURRENT_TIME; |
33345d01 | 9375 | if (unlikely(btrfs_ino(new_inode) == |
4df27c4d YZ |
9376 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
9377 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
9378 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
9379 | root_objectid, | |
9380 | new_dentry->d_name.name, | |
9381 | new_dentry->d_name.len); | |
9382 | BUG_ON(new_inode->i_nlink == 0); | |
9383 | } else { | |
9384 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
2b0143b5 | 9385 | d_inode(new_dentry), |
4df27c4d YZ |
9386 | new_dentry->d_name.name, |
9387 | new_dentry->d_name.len); | |
9388 | } | |
4ef31a45 | 9389 | if (!ret && new_inode->i_nlink == 0) |
2b0143b5 | 9390 | ret = btrfs_orphan_add(trans, d_inode(new_dentry)); |
79787eaa JM |
9391 | if (ret) { |
9392 | btrfs_abort_transaction(trans, root, ret); | |
9393 | goto out_fail; | |
9394 | } | |
39279cc3 | 9395 | } |
aec7477b | 9396 | |
4df27c4d YZ |
9397 | ret = btrfs_add_link(trans, new_dir, old_inode, |
9398 | new_dentry->d_name.name, | |
a5719521 | 9399 | new_dentry->d_name.len, 0, index); |
79787eaa JM |
9400 | if (ret) { |
9401 | btrfs_abort_transaction(trans, root, ret); | |
9402 | goto out_fail; | |
9403 | } | |
39279cc3 | 9404 | |
67de1176 MX |
9405 | if (old_inode->i_nlink == 1) |
9406 | BTRFS_I(old_inode)->dir_index = index; | |
9407 | ||
33345d01 | 9408 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
10d9f309 | 9409 | struct dentry *parent = new_dentry->d_parent; |
6a912213 | 9410 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
4df27c4d YZ |
9411 | btrfs_end_log_trans(root); |
9412 | } | |
39279cc3 | 9413 | out_fail: |
7ad85bb7 | 9414 | btrfs_end_transaction(trans, root); |
b44c59a8 | 9415 | out_notrans: |
33345d01 | 9416 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 9417 | up_read(&root->fs_info->subvol_sem); |
9ed74f2d | 9418 | |
39279cc3 CM |
9419 | return ret; |
9420 | } | |
9421 | ||
80ace85c MS |
9422 | static int btrfs_rename2(struct inode *old_dir, struct dentry *old_dentry, |
9423 | struct inode *new_dir, struct dentry *new_dentry, | |
9424 | unsigned int flags) | |
9425 | { | |
9426 | if (flags & ~RENAME_NOREPLACE) | |
9427 | return -EINVAL; | |
9428 | ||
9429 | return btrfs_rename(old_dir, old_dentry, new_dir, new_dentry); | |
9430 | } | |
9431 | ||
8ccf6f19 MX |
9432 | static void btrfs_run_delalloc_work(struct btrfs_work *work) |
9433 | { | |
9434 | struct btrfs_delalloc_work *delalloc_work; | |
9f23e289 | 9435 | struct inode *inode; |
8ccf6f19 MX |
9436 | |
9437 | delalloc_work = container_of(work, struct btrfs_delalloc_work, | |
9438 | work); | |
9f23e289 JB |
9439 | inode = delalloc_work->inode; |
9440 | if (delalloc_work->wait) { | |
9441 | btrfs_wait_ordered_range(inode, 0, (u64)-1); | |
9442 | } else { | |
9443 | filemap_flush(inode->i_mapping); | |
9444 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
9445 | &BTRFS_I(inode)->runtime_flags)) | |
9446 | filemap_flush(inode->i_mapping); | |
9447 | } | |
8ccf6f19 MX |
9448 | |
9449 | if (delalloc_work->delay_iput) | |
9f23e289 | 9450 | btrfs_add_delayed_iput(inode); |
8ccf6f19 | 9451 | else |
9f23e289 | 9452 | iput(inode); |
8ccf6f19 MX |
9453 | complete(&delalloc_work->completion); |
9454 | } | |
9455 | ||
9456 | struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, | |
9457 | int wait, int delay_iput) | |
9458 | { | |
9459 | struct btrfs_delalloc_work *work; | |
9460 | ||
9461 | work = kmem_cache_zalloc(btrfs_delalloc_work_cachep, GFP_NOFS); | |
9462 | if (!work) | |
9463 | return NULL; | |
9464 | ||
9465 | init_completion(&work->completion); | |
9466 | INIT_LIST_HEAD(&work->list); | |
9467 | work->inode = inode; | |
9468 | work->wait = wait; | |
9469 | work->delay_iput = delay_iput; | |
9e0af237 LB |
9470 | WARN_ON_ONCE(!inode); |
9471 | btrfs_init_work(&work->work, btrfs_flush_delalloc_helper, | |
9472 | btrfs_run_delalloc_work, NULL, NULL); | |
8ccf6f19 MX |
9473 | |
9474 | return work; | |
9475 | } | |
9476 | ||
9477 | void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work) | |
9478 | { | |
9479 | wait_for_completion(&work->completion); | |
9480 | kmem_cache_free(btrfs_delalloc_work_cachep, work); | |
9481 | } | |
9482 | ||
d352ac68 CM |
9483 | /* |
9484 | * some fairly slow code that needs optimization. This walks the list | |
9485 | * of all the inodes with pending delalloc and forces them to disk. | |
9486 | */ | |
6c255e67 MX |
9487 | static int __start_delalloc_inodes(struct btrfs_root *root, int delay_iput, |
9488 | int nr) | |
ea8c2819 | 9489 | { |
ea8c2819 | 9490 | struct btrfs_inode *binode; |
5b21f2ed | 9491 | struct inode *inode; |
8ccf6f19 MX |
9492 | struct btrfs_delalloc_work *work, *next; |
9493 | struct list_head works; | |
1eafa6c7 | 9494 | struct list_head splice; |
8ccf6f19 | 9495 | int ret = 0; |
ea8c2819 | 9496 | |
8ccf6f19 | 9497 | INIT_LIST_HEAD(&works); |
1eafa6c7 | 9498 | INIT_LIST_HEAD(&splice); |
63607cc8 | 9499 | |
573bfb72 | 9500 | mutex_lock(&root->delalloc_mutex); |
eb73c1b7 MX |
9501 | spin_lock(&root->delalloc_lock); |
9502 | list_splice_init(&root->delalloc_inodes, &splice); | |
1eafa6c7 MX |
9503 | while (!list_empty(&splice)) { |
9504 | binode = list_entry(splice.next, struct btrfs_inode, | |
ea8c2819 | 9505 | delalloc_inodes); |
1eafa6c7 | 9506 | |
eb73c1b7 MX |
9507 | list_move_tail(&binode->delalloc_inodes, |
9508 | &root->delalloc_inodes); | |
5b21f2ed | 9509 | inode = igrab(&binode->vfs_inode); |
df0af1a5 | 9510 | if (!inode) { |
eb73c1b7 | 9511 | cond_resched_lock(&root->delalloc_lock); |
1eafa6c7 | 9512 | continue; |
df0af1a5 | 9513 | } |
eb73c1b7 | 9514 | spin_unlock(&root->delalloc_lock); |
1eafa6c7 MX |
9515 | |
9516 | work = btrfs_alloc_delalloc_work(inode, 0, delay_iput); | |
5d99a998 | 9517 | if (!work) { |
f4ab9ea7 JB |
9518 | if (delay_iput) |
9519 | btrfs_add_delayed_iput(inode); | |
9520 | else | |
9521 | iput(inode); | |
1eafa6c7 | 9522 | ret = -ENOMEM; |
a1ecaabb | 9523 | goto out; |
5b21f2ed | 9524 | } |
1eafa6c7 | 9525 | list_add_tail(&work->list, &works); |
a44903ab QW |
9526 | btrfs_queue_work(root->fs_info->flush_workers, |
9527 | &work->work); | |
6c255e67 MX |
9528 | ret++; |
9529 | if (nr != -1 && ret >= nr) | |
a1ecaabb | 9530 | goto out; |
5b21f2ed | 9531 | cond_resched(); |
eb73c1b7 | 9532 | spin_lock(&root->delalloc_lock); |
ea8c2819 | 9533 | } |
eb73c1b7 | 9534 | spin_unlock(&root->delalloc_lock); |
8c8bee1d | 9535 | |
a1ecaabb | 9536 | out: |
eb73c1b7 MX |
9537 | list_for_each_entry_safe(work, next, &works, list) { |
9538 | list_del_init(&work->list); | |
9539 | btrfs_wait_and_free_delalloc_work(work); | |
9540 | } | |
9541 | ||
9542 | if (!list_empty_careful(&splice)) { | |
9543 | spin_lock(&root->delalloc_lock); | |
9544 | list_splice_tail(&splice, &root->delalloc_inodes); | |
9545 | spin_unlock(&root->delalloc_lock); | |
9546 | } | |
573bfb72 | 9547 | mutex_unlock(&root->delalloc_mutex); |
eb73c1b7 MX |
9548 | return ret; |
9549 | } | |
1eafa6c7 | 9550 | |
eb73c1b7 MX |
9551 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
9552 | { | |
9553 | int ret; | |
1eafa6c7 | 9554 | |
2c21b4d7 | 9555 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
eb73c1b7 MX |
9556 | return -EROFS; |
9557 | ||
6c255e67 MX |
9558 | ret = __start_delalloc_inodes(root, delay_iput, -1); |
9559 | if (ret > 0) | |
9560 | ret = 0; | |
eb73c1b7 MX |
9561 | /* |
9562 | * the filemap_flush will queue IO into the worker threads, but | |
8c8bee1d CM |
9563 | * we have to make sure the IO is actually started and that |
9564 | * ordered extents get created before we return | |
9565 | */ | |
9566 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 9567 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 9568 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 9569 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
9570 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
9571 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
9572 | } |
9573 | atomic_dec(&root->fs_info->async_submit_draining); | |
eb73c1b7 MX |
9574 | return ret; |
9575 | } | |
9576 | ||
6c255e67 MX |
9577 | int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput, |
9578 | int nr) | |
eb73c1b7 MX |
9579 | { |
9580 | struct btrfs_root *root; | |
9581 | struct list_head splice; | |
9582 | int ret; | |
9583 | ||
2c21b4d7 | 9584 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) |
eb73c1b7 MX |
9585 | return -EROFS; |
9586 | ||
9587 | INIT_LIST_HEAD(&splice); | |
9588 | ||
573bfb72 | 9589 | mutex_lock(&fs_info->delalloc_root_mutex); |
eb73c1b7 MX |
9590 | spin_lock(&fs_info->delalloc_root_lock); |
9591 | list_splice_init(&fs_info->delalloc_roots, &splice); | |
6c255e67 | 9592 | while (!list_empty(&splice) && nr) { |
eb73c1b7 MX |
9593 | root = list_first_entry(&splice, struct btrfs_root, |
9594 | delalloc_root); | |
9595 | root = btrfs_grab_fs_root(root); | |
9596 | BUG_ON(!root); | |
9597 | list_move_tail(&root->delalloc_root, | |
9598 | &fs_info->delalloc_roots); | |
9599 | spin_unlock(&fs_info->delalloc_root_lock); | |
9600 | ||
6c255e67 | 9601 | ret = __start_delalloc_inodes(root, delay_iput, nr); |
eb73c1b7 | 9602 | btrfs_put_fs_root(root); |
6c255e67 | 9603 | if (ret < 0) |
eb73c1b7 MX |
9604 | goto out; |
9605 | ||
6c255e67 MX |
9606 | if (nr != -1) { |
9607 | nr -= ret; | |
9608 | WARN_ON(nr < 0); | |
9609 | } | |
eb73c1b7 | 9610 | spin_lock(&fs_info->delalloc_root_lock); |
8ccf6f19 | 9611 | } |
eb73c1b7 | 9612 | spin_unlock(&fs_info->delalloc_root_lock); |
1eafa6c7 | 9613 | |
6c255e67 | 9614 | ret = 0; |
eb73c1b7 MX |
9615 | atomic_inc(&fs_info->async_submit_draining); |
9616 | while (atomic_read(&fs_info->nr_async_submits) || | |
9617 | atomic_read(&fs_info->async_delalloc_pages)) { | |
9618 | wait_event(fs_info->async_submit_wait, | |
9619 | (atomic_read(&fs_info->nr_async_submits) == 0 && | |
9620 | atomic_read(&fs_info->async_delalloc_pages) == 0)); | |
9621 | } | |
9622 | atomic_dec(&fs_info->async_submit_draining); | |
eb73c1b7 | 9623 | out: |
1eafa6c7 | 9624 | if (!list_empty_careful(&splice)) { |
eb73c1b7 MX |
9625 | spin_lock(&fs_info->delalloc_root_lock); |
9626 | list_splice_tail(&splice, &fs_info->delalloc_roots); | |
9627 | spin_unlock(&fs_info->delalloc_root_lock); | |
1eafa6c7 | 9628 | } |
573bfb72 | 9629 | mutex_unlock(&fs_info->delalloc_root_mutex); |
8ccf6f19 | 9630 | return ret; |
ea8c2819 CM |
9631 | } |
9632 | ||
39279cc3 CM |
9633 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
9634 | const char *symname) | |
9635 | { | |
9636 | struct btrfs_trans_handle *trans; | |
9637 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9638 | struct btrfs_path *path; | |
9639 | struct btrfs_key key; | |
1832a6d5 | 9640 | struct inode *inode = NULL; |
39279cc3 CM |
9641 | int err; |
9642 | int drop_inode = 0; | |
9643 | u64 objectid; | |
67871254 | 9644 | u64 index = 0; |
39279cc3 CM |
9645 | int name_len; |
9646 | int datasize; | |
5f39d397 | 9647 | unsigned long ptr; |
39279cc3 | 9648 | struct btrfs_file_extent_item *ei; |
5f39d397 | 9649 | struct extent_buffer *leaf; |
39279cc3 | 9650 | |
f06becc4 | 9651 | name_len = strlen(symname); |
39279cc3 CM |
9652 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
9653 | return -ENAMETOOLONG; | |
1832a6d5 | 9654 | |
9ed74f2d JB |
9655 | /* |
9656 | * 2 items for inode item and ref | |
9657 | * 2 items for dir items | |
9658 | * 1 item for xattr if selinux is on | |
9659 | */ | |
a22285a6 YZ |
9660 | trans = btrfs_start_transaction(root, 5); |
9661 | if (IS_ERR(trans)) | |
9662 | return PTR_ERR(trans); | |
1832a6d5 | 9663 | |
581bb050 LZ |
9664 | err = btrfs_find_free_ino(root, &objectid); |
9665 | if (err) | |
9666 | goto out_unlock; | |
9667 | ||
aec7477b | 9668 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 9669 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 9670 | S_IFLNK|S_IRWXUGO, &index); |
7cf96da3 TI |
9671 | if (IS_ERR(inode)) { |
9672 | err = PTR_ERR(inode); | |
39279cc3 | 9673 | goto out_unlock; |
7cf96da3 | 9674 | } |
39279cc3 | 9675 | |
ad19db71 CS |
9676 | /* |
9677 | * If the active LSM wants to access the inode during | |
9678 | * d_instantiate it needs these. Smack checks to see | |
9679 | * if the filesystem supports xattrs by looking at the | |
9680 | * ops vector. | |
9681 | */ | |
9682 | inode->i_fop = &btrfs_file_operations; | |
9683 | inode->i_op = &btrfs_file_inode_operations; | |
b0d5d10f | 9684 | inode->i_mapping->a_ops = &btrfs_aops; |
b0d5d10f CM |
9685 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9686 | ||
9687 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); | |
9688 | if (err) | |
9689 | goto out_unlock_inode; | |
ad19db71 | 9690 | |
a1b075d2 | 9691 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 9692 | if (err) |
b0d5d10f | 9693 | goto out_unlock_inode; |
39279cc3 CM |
9694 | |
9695 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
9696 | if (!path) { |
9697 | err = -ENOMEM; | |
b0d5d10f | 9698 | goto out_unlock_inode; |
d8926bb3 | 9699 | } |
33345d01 | 9700 | key.objectid = btrfs_ino(inode); |
39279cc3 | 9701 | key.offset = 0; |
962a298f | 9702 | key.type = BTRFS_EXTENT_DATA_KEY; |
39279cc3 CM |
9703 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
9704 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
9705 | datasize); | |
54aa1f4d | 9706 | if (err) { |
b0839166 | 9707 | btrfs_free_path(path); |
b0d5d10f | 9708 | goto out_unlock_inode; |
54aa1f4d | 9709 | } |
5f39d397 CM |
9710 | leaf = path->nodes[0]; |
9711 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
9712 | struct btrfs_file_extent_item); | |
9713 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
9714 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 9715 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
9716 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
9717 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
9718 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
9719 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
9720 | ||
39279cc3 | 9721 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
9722 | write_extent_buffer(leaf, symname, ptr, name_len); |
9723 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 9724 | btrfs_free_path(path); |
5f39d397 | 9725 | |
39279cc3 CM |
9726 | inode->i_op = &btrfs_symlink_inode_operations; |
9727 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
d899e052 | 9728 | inode_set_bytes(inode, name_len); |
f06becc4 | 9729 | btrfs_i_size_write(inode, name_len); |
54aa1f4d | 9730 | err = btrfs_update_inode(trans, root, inode); |
b0d5d10f | 9731 | if (err) { |
54aa1f4d | 9732 | drop_inode = 1; |
b0d5d10f CM |
9733 | goto out_unlock_inode; |
9734 | } | |
9735 | ||
9736 | unlock_new_inode(inode); | |
9737 | d_instantiate(dentry, inode); | |
39279cc3 CM |
9738 | |
9739 | out_unlock: | |
7ad85bb7 | 9740 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
9741 | if (drop_inode) { |
9742 | inode_dec_link_count(inode); | |
9743 | iput(inode); | |
9744 | } | |
b53d3f5d | 9745 | btrfs_btree_balance_dirty(root); |
39279cc3 | 9746 | return err; |
b0d5d10f CM |
9747 | |
9748 | out_unlock_inode: | |
9749 | drop_inode = 1; | |
9750 | unlock_new_inode(inode); | |
9751 | goto out_unlock; | |
39279cc3 | 9752 | } |
16432985 | 9753 | |
0af3d00b JB |
9754 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
9755 | u64 start, u64 num_bytes, u64 min_size, | |
9756 | loff_t actual_len, u64 *alloc_hint, | |
9757 | struct btrfs_trans_handle *trans) | |
d899e052 | 9758 | { |
5dc562c5 JB |
9759 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
9760 | struct extent_map *em; | |
d899e052 YZ |
9761 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9762 | struct btrfs_key ins; | |
d899e052 | 9763 | u64 cur_offset = start; |
55a61d1d | 9764 | u64 i_size; |
154ea289 | 9765 | u64 cur_bytes; |
0b670dc4 | 9766 | u64 last_alloc = (u64)-1; |
d899e052 | 9767 | int ret = 0; |
0af3d00b | 9768 | bool own_trans = true; |
d899e052 | 9769 | |
0af3d00b JB |
9770 | if (trans) |
9771 | own_trans = false; | |
d899e052 | 9772 | while (num_bytes > 0) { |
0af3d00b JB |
9773 | if (own_trans) { |
9774 | trans = btrfs_start_transaction(root, 3); | |
9775 | if (IS_ERR(trans)) { | |
9776 | ret = PTR_ERR(trans); | |
9777 | break; | |
9778 | } | |
5a303d5d YZ |
9779 | } |
9780 | ||
154ea289 CM |
9781 | cur_bytes = min(num_bytes, 256ULL * 1024 * 1024); |
9782 | cur_bytes = max(cur_bytes, min_size); | |
0b670dc4 JB |
9783 | /* |
9784 | * If we are severely fragmented we could end up with really | |
9785 | * small allocations, so if the allocator is returning small | |
9786 | * chunks lets make its job easier by only searching for those | |
9787 | * sized chunks. | |
9788 | */ | |
9789 | cur_bytes = min(cur_bytes, last_alloc); | |
00361589 | 9790 | ret = btrfs_reserve_extent(root, cur_bytes, min_size, 0, |
e570fd27 | 9791 | *alloc_hint, &ins, 1, 0); |
5a303d5d | 9792 | if (ret) { |
0af3d00b JB |
9793 | if (own_trans) |
9794 | btrfs_end_transaction(trans, root); | |
a22285a6 | 9795 | break; |
d899e052 | 9796 | } |
5a303d5d | 9797 | |
0b670dc4 | 9798 | last_alloc = ins.offset; |
d899e052 YZ |
9799 | ret = insert_reserved_file_extent(trans, inode, |
9800 | cur_offset, ins.objectid, | |
9801 | ins.offset, ins.offset, | |
920bbbfb | 9802 | ins.offset, 0, 0, 0, |
d899e052 | 9803 | BTRFS_FILE_EXTENT_PREALLOC); |
79787eaa | 9804 | if (ret) { |
857cc2fc | 9805 | btrfs_free_reserved_extent(root, ins.objectid, |
e570fd27 | 9806 | ins.offset, 0); |
79787eaa JM |
9807 | btrfs_abort_transaction(trans, root, ret); |
9808 | if (own_trans) | |
9809 | btrfs_end_transaction(trans, root); | |
9810 | break; | |
9811 | } | |
31193213 | 9812 | |
a1ed835e CM |
9813 | btrfs_drop_extent_cache(inode, cur_offset, |
9814 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 9815 | |
5dc562c5 JB |
9816 | em = alloc_extent_map(); |
9817 | if (!em) { | |
9818 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
9819 | &BTRFS_I(inode)->runtime_flags); | |
9820 | goto next; | |
9821 | } | |
9822 | ||
9823 | em->start = cur_offset; | |
9824 | em->orig_start = cur_offset; | |
9825 | em->len = ins.offset; | |
9826 | em->block_start = ins.objectid; | |
9827 | em->block_len = ins.offset; | |
b4939680 | 9828 | em->orig_block_len = ins.offset; |
cc95bef6 | 9829 | em->ram_bytes = ins.offset; |
5dc562c5 JB |
9830 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
9831 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
9832 | em->generation = trans->transid; | |
9833 | ||
9834 | while (1) { | |
9835 | write_lock(&em_tree->lock); | |
09a2a8f9 | 9836 | ret = add_extent_mapping(em_tree, em, 1); |
5dc562c5 JB |
9837 | write_unlock(&em_tree->lock); |
9838 | if (ret != -EEXIST) | |
9839 | break; | |
9840 | btrfs_drop_extent_cache(inode, cur_offset, | |
9841 | cur_offset + ins.offset - 1, | |
9842 | 0); | |
9843 | } | |
9844 | free_extent_map(em); | |
9845 | next: | |
d899e052 YZ |
9846 | num_bytes -= ins.offset; |
9847 | cur_offset += ins.offset; | |
efa56464 | 9848 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 9849 | |
0c4d2d95 | 9850 | inode_inc_iversion(inode); |
d899e052 | 9851 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 9852 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 9853 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
9854 | (actual_len > inode->i_size) && |
9855 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 9856 | if (cur_offset > actual_len) |
55a61d1d | 9857 | i_size = actual_len; |
d1ea6a61 | 9858 | else |
55a61d1d JB |
9859 | i_size = cur_offset; |
9860 | i_size_write(inode, i_size); | |
9861 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
9862 | } |
9863 | ||
d899e052 | 9864 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
9865 | |
9866 | if (ret) { | |
9867 | btrfs_abort_transaction(trans, root, ret); | |
9868 | if (own_trans) | |
9869 | btrfs_end_transaction(trans, root); | |
9870 | break; | |
9871 | } | |
d899e052 | 9872 | |
0af3d00b JB |
9873 | if (own_trans) |
9874 | btrfs_end_transaction(trans, root); | |
5a303d5d | 9875 | } |
d899e052 YZ |
9876 | return ret; |
9877 | } | |
9878 | ||
0af3d00b JB |
9879 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
9880 | u64 start, u64 num_bytes, u64 min_size, | |
9881 | loff_t actual_len, u64 *alloc_hint) | |
9882 | { | |
9883 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9884 | min_size, actual_len, alloc_hint, | |
9885 | NULL); | |
9886 | } | |
9887 | ||
9888 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
9889 | struct btrfs_trans_handle *trans, int mode, | |
9890 | u64 start, u64 num_bytes, u64 min_size, | |
9891 | loff_t actual_len, u64 *alloc_hint) | |
9892 | { | |
9893 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
9894 | min_size, actual_len, alloc_hint, trans); | |
9895 | } | |
9896 | ||
e6dcd2dc CM |
9897 | static int btrfs_set_page_dirty(struct page *page) |
9898 | { | |
e6dcd2dc CM |
9899 | return __set_page_dirty_nobuffers(page); |
9900 | } | |
9901 | ||
10556cb2 | 9902 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd | 9903 | { |
b83cc969 | 9904 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cb6db4e5 | 9905 | umode_t mode = inode->i_mode; |
b83cc969 | 9906 | |
cb6db4e5 JM |
9907 | if (mask & MAY_WRITE && |
9908 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { | |
9909 | if (btrfs_root_readonly(root)) | |
9910 | return -EROFS; | |
9911 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) | |
9912 | return -EACCES; | |
9913 | } | |
2830ba7f | 9914 | return generic_permission(inode, mask); |
fdebe2bd | 9915 | } |
39279cc3 | 9916 | |
ef3b9af5 FM |
9917 | static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
9918 | { | |
9919 | struct btrfs_trans_handle *trans; | |
9920 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
9921 | struct inode *inode = NULL; | |
9922 | u64 objectid; | |
9923 | u64 index; | |
9924 | int ret = 0; | |
9925 | ||
9926 | /* | |
9927 | * 5 units required for adding orphan entry | |
9928 | */ | |
9929 | trans = btrfs_start_transaction(root, 5); | |
9930 | if (IS_ERR(trans)) | |
9931 | return PTR_ERR(trans); | |
9932 | ||
9933 | ret = btrfs_find_free_ino(root, &objectid); | |
9934 | if (ret) | |
9935 | goto out; | |
9936 | ||
9937 | inode = btrfs_new_inode(trans, root, dir, NULL, 0, | |
9938 | btrfs_ino(dir), objectid, mode, &index); | |
9939 | if (IS_ERR(inode)) { | |
9940 | ret = PTR_ERR(inode); | |
9941 | inode = NULL; | |
9942 | goto out; | |
9943 | } | |
9944 | ||
ef3b9af5 FM |
9945 | inode->i_fop = &btrfs_file_operations; |
9946 | inode->i_op = &btrfs_file_inode_operations; | |
9947 | ||
9948 | inode->i_mapping->a_ops = &btrfs_aops; | |
ef3b9af5 FM |
9949 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
9950 | ||
b0d5d10f CM |
9951 | ret = btrfs_init_inode_security(trans, inode, dir, NULL); |
9952 | if (ret) | |
9953 | goto out_inode; | |
9954 | ||
9955 | ret = btrfs_update_inode(trans, root, inode); | |
9956 | if (ret) | |
9957 | goto out_inode; | |
ef3b9af5 FM |
9958 | ret = btrfs_orphan_add(trans, inode); |
9959 | if (ret) | |
b0d5d10f | 9960 | goto out_inode; |
ef3b9af5 | 9961 | |
5762b5c9 FM |
9962 | /* |
9963 | * We set number of links to 0 in btrfs_new_inode(), and here we set | |
9964 | * it to 1 because d_tmpfile() will issue a warning if the count is 0, | |
9965 | * through: | |
9966 | * | |
9967 | * d_tmpfile() -> inode_dec_link_count() -> drop_nlink() | |
9968 | */ | |
9969 | set_nlink(inode, 1); | |
b0d5d10f | 9970 | unlock_new_inode(inode); |
ef3b9af5 FM |
9971 | d_tmpfile(dentry, inode); |
9972 | mark_inode_dirty(inode); | |
9973 | ||
9974 | out: | |
9975 | btrfs_end_transaction(trans, root); | |
9976 | if (ret) | |
9977 | iput(inode); | |
9978 | btrfs_balance_delayed_items(root); | |
9979 | btrfs_btree_balance_dirty(root); | |
ef3b9af5 | 9980 | return ret; |
b0d5d10f CM |
9981 | |
9982 | out_inode: | |
9983 | unlock_new_inode(inode); | |
9984 | goto out; | |
9985 | ||
ef3b9af5 FM |
9986 | } |
9987 | ||
b38ef71c FM |
9988 | /* Inspired by filemap_check_errors() */ |
9989 | int btrfs_inode_check_errors(struct inode *inode) | |
9990 | { | |
9991 | int ret = 0; | |
9992 | ||
9993 | if (test_bit(AS_ENOSPC, &inode->i_mapping->flags) && | |
9994 | test_and_clear_bit(AS_ENOSPC, &inode->i_mapping->flags)) | |
9995 | ret = -ENOSPC; | |
9996 | if (test_bit(AS_EIO, &inode->i_mapping->flags) && | |
9997 | test_and_clear_bit(AS_EIO, &inode->i_mapping->flags)) | |
9998 | ret = -EIO; | |
9999 | ||
10000 | return ret; | |
10001 | } | |
10002 | ||
6e1d5dcc | 10003 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 10004 | .getattr = btrfs_getattr, |
39279cc3 CM |
10005 | .lookup = btrfs_lookup, |
10006 | .create = btrfs_create, | |
10007 | .unlink = btrfs_unlink, | |
10008 | .link = btrfs_link, | |
10009 | .mkdir = btrfs_mkdir, | |
10010 | .rmdir = btrfs_rmdir, | |
80ace85c | 10011 | .rename2 = btrfs_rename2, |
39279cc3 CM |
10012 | .symlink = btrfs_symlink, |
10013 | .setattr = btrfs_setattr, | |
618e21d5 | 10014 | .mknod = btrfs_mknod, |
95819c05 CH |
10015 | .setxattr = btrfs_setxattr, |
10016 | .getxattr = btrfs_getxattr, | |
5103e947 | 10017 | .listxattr = btrfs_listxattr, |
95819c05 | 10018 | .removexattr = btrfs_removexattr, |
fdebe2bd | 10019 | .permission = btrfs_permission, |
4e34e719 | 10020 | .get_acl = btrfs_get_acl, |
996a710d | 10021 | .set_acl = btrfs_set_acl, |
93fd63c2 | 10022 | .update_time = btrfs_update_time, |
ef3b9af5 | 10023 | .tmpfile = btrfs_tmpfile, |
39279cc3 | 10024 | }; |
6e1d5dcc | 10025 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 10026 | .lookup = btrfs_lookup, |
fdebe2bd | 10027 | .permission = btrfs_permission, |
4e34e719 | 10028 | .get_acl = btrfs_get_acl, |
996a710d | 10029 | .set_acl = btrfs_set_acl, |
93fd63c2 | 10030 | .update_time = btrfs_update_time, |
39279cc3 | 10031 | }; |
76dda93c | 10032 | |
828c0950 | 10033 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
10034 | .llseek = generic_file_llseek, |
10035 | .read = generic_read_dir, | |
9cdda8d3 | 10036 | .iterate = btrfs_real_readdir, |
34287aa3 | 10037 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 10038 | #ifdef CONFIG_COMPAT |
34287aa3 | 10039 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 10040 | #endif |
6bf13c0c | 10041 | .release = btrfs_release_file, |
e02119d5 | 10042 | .fsync = btrfs_sync_file, |
39279cc3 CM |
10043 | }; |
10044 | ||
d1310b2e | 10045 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 10046 | .fill_delalloc = run_delalloc_range, |
065631f6 | 10047 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 10048 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 10049 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 10050 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 10051 | .writepage_start_hook = btrfs_writepage_start_hook, |
b0c68f8b CM |
10052 | .set_bit_hook = btrfs_set_bit_hook, |
10053 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
10054 | .merge_extent_hook = btrfs_merge_extent_hook, |
10055 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
10056 | }; |
10057 | ||
35054394 CM |
10058 | /* |
10059 | * btrfs doesn't support the bmap operation because swapfiles | |
10060 | * use bmap to make a mapping of extents in the file. They assume | |
10061 | * these extents won't change over the life of the file and they | |
10062 | * use the bmap result to do IO directly to the drive. | |
10063 | * | |
10064 | * the btrfs bmap call would return logical addresses that aren't | |
10065 | * suitable for IO and they also will change frequently as COW | |
10066 | * operations happen. So, swapfile + btrfs == corruption. | |
10067 | * | |
10068 | * For now we're avoiding this by dropping bmap. | |
10069 | */ | |
7f09410b | 10070 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
10071 | .readpage = btrfs_readpage, |
10072 | .writepage = btrfs_writepage, | |
b293f02e | 10073 | .writepages = btrfs_writepages, |
3ab2fb5a | 10074 | .readpages = btrfs_readpages, |
16432985 | 10075 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
10076 | .invalidatepage = btrfs_invalidatepage, |
10077 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 10078 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 10079 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
10080 | }; |
10081 | ||
7f09410b | 10082 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
10083 | .readpage = btrfs_readpage, |
10084 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
10085 | .invalidatepage = btrfs_invalidatepage, |
10086 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
10087 | }; |
10088 | ||
6e1d5dcc | 10089 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
10090 | .getattr = btrfs_getattr, |
10091 | .setattr = btrfs_setattr, | |
95819c05 CH |
10092 | .setxattr = btrfs_setxattr, |
10093 | .getxattr = btrfs_getxattr, | |
5103e947 | 10094 | .listxattr = btrfs_listxattr, |
95819c05 | 10095 | .removexattr = btrfs_removexattr, |
fdebe2bd | 10096 | .permission = btrfs_permission, |
1506fcc8 | 10097 | .fiemap = btrfs_fiemap, |
4e34e719 | 10098 | .get_acl = btrfs_get_acl, |
996a710d | 10099 | .set_acl = btrfs_set_acl, |
e41f941a | 10100 | .update_time = btrfs_update_time, |
39279cc3 | 10101 | }; |
6e1d5dcc | 10102 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
10103 | .getattr = btrfs_getattr, |
10104 | .setattr = btrfs_setattr, | |
fdebe2bd | 10105 | .permission = btrfs_permission, |
95819c05 CH |
10106 | .setxattr = btrfs_setxattr, |
10107 | .getxattr = btrfs_getxattr, | |
33268eaf | 10108 | .listxattr = btrfs_listxattr, |
95819c05 | 10109 | .removexattr = btrfs_removexattr, |
4e34e719 | 10110 | .get_acl = btrfs_get_acl, |
996a710d | 10111 | .set_acl = btrfs_set_acl, |
e41f941a | 10112 | .update_time = btrfs_update_time, |
618e21d5 | 10113 | }; |
6e1d5dcc | 10114 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
10115 | .readlink = generic_readlink, |
10116 | .follow_link = page_follow_link_light, | |
10117 | .put_link = page_put_link, | |
f209561a | 10118 | .getattr = btrfs_getattr, |
22c44fe6 | 10119 | .setattr = btrfs_setattr, |
fdebe2bd | 10120 | .permission = btrfs_permission, |
0279b4cd JO |
10121 | .setxattr = btrfs_setxattr, |
10122 | .getxattr = btrfs_getxattr, | |
10123 | .listxattr = btrfs_listxattr, | |
10124 | .removexattr = btrfs_removexattr, | |
e41f941a | 10125 | .update_time = btrfs_update_time, |
39279cc3 | 10126 | }; |
76dda93c | 10127 | |
82d339d9 | 10128 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c | 10129 | .d_delete = btrfs_dentry_delete, |
b4aff1f8 | 10130 | .d_release = btrfs_dentry_release, |
76dda93c | 10131 | }; |