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> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/backing-dev.h> | |
31 | #include <linux/mpage.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/writeback.h> | |
34 | #include <linux/statfs.h> | |
35 | #include <linux/compat.h> | |
9ebefb18 | 36 | #include <linux/bit_spinlock.h> |
92fee66d | 37 | #include <linux/version.h> |
5103e947 | 38 | #include <linux/xattr.h> |
39279cc3 CM |
39 | #include "ctree.h" |
40 | #include "disk-io.h" | |
41 | #include "transaction.h" | |
42 | #include "btrfs_inode.h" | |
43 | #include "ioctl.h" | |
44 | #include "print-tree.h" | |
0b86a832 | 45 | #include "volumes.h" |
39279cc3 CM |
46 | |
47 | struct btrfs_iget_args { | |
48 | u64 ino; | |
49 | struct btrfs_root *root; | |
50 | }; | |
51 | ||
52 | static struct inode_operations btrfs_dir_inode_operations; | |
53 | static struct inode_operations btrfs_symlink_inode_operations; | |
54 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 55 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
56 | static struct inode_operations btrfs_file_inode_operations; |
57 | static struct address_space_operations btrfs_aops; | |
58 | static struct address_space_operations btrfs_symlink_aops; | |
59 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 60 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
61 | |
62 | static struct kmem_cache *btrfs_inode_cachep; | |
63 | struct kmem_cache *btrfs_trans_handle_cachep; | |
64 | struct kmem_cache *btrfs_transaction_cachep; | |
65 | struct kmem_cache *btrfs_bit_radix_cachep; | |
66 | struct kmem_cache *btrfs_path_cachep; | |
67 | ||
68 | #define S_SHIFT 12 | |
69 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
70 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
71 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
72 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
73 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
74 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
75 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
76 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
77 | }; | |
78 | ||
1832a6d5 CM |
79 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
80 | int for_del) | |
81 | { | |
a2135011 CM |
82 | u64 total; |
83 | u64 used; | |
1832a6d5 | 84 | u64 thresh; |
bcbfce8a | 85 | unsigned long flags; |
1832a6d5 CM |
86 | int ret = 0; |
87 | ||
a2135011 CM |
88 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
89 | total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
90 | used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
1832a6d5 | 91 | if (for_del) |
f9ef6604 | 92 | thresh = total * 90; |
1832a6d5 | 93 | else |
f9ef6604 CM |
94 | thresh = total * 85; |
95 | ||
96 | do_div(thresh, 100); | |
1832a6d5 | 97 | |
1832a6d5 CM |
98 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) |
99 | ret = -ENOSPC; | |
bcbfce8a | 100 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
101 | return ret; |
102 | } | |
103 | ||
be20aa9d | 104 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
105 | { |
106 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
107 | struct btrfs_trans_handle *trans; | |
b888db2b | 108 | u64 alloc_hint = 0; |
db94535d | 109 | u64 num_bytes; |
c59f8951 | 110 | u64 cur_alloc_size; |
db94535d | 111 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
112 | u64 orig_start = start; |
113 | u64 orig_num_bytes; | |
be20aa9d CM |
114 | struct btrfs_key ins; |
115 | int ret; | |
b888db2b | 116 | |
b888db2b | 117 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 118 | BUG_ON(!trans); |
be20aa9d CM |
119 | btrfs_set_trans_block_group(trans, inode); |
120 | ||
db94535d | 121 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 122 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 123 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 124 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 125 | orig_num_bytes = num_bytes; |
db94535d | 126 | |
179e29e4 CM |
127 | if (alloc_hint == EXTENT_MAP_INLINE) |
128 | goto out; | |
129 | ||
3b951516 CM |
130 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
131 | ||
c59f8951 CM |
132 | while(num_bytes > 0) { |
133 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
134 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
98d20f67 | 135 | root->sectorsize, |
c59f8951 CM |
136 | root->root_key.objectid, |
137 | trans->transid, | |
138 | inode->i_ino, start, 0, | |
139 | alloc_hint, (u64)-1, &ins, 1); | |
140 | if (ret) { | |
141 | WARN_ON(1); | |
142 | goto out; | |
143 | } | |
98d20f67 | 144 | cur_alloc_size = ins.offset; |
c59f8951 CM |
145 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, |
146 | start, ins.objectid, ins.offset, | |
f2eb0a24 | 147 | ins.offset, 0); |
9069218d | 148 | inode->i_blocks += ins.offset >> 9; |
5f56406a | 149 | btrfs_check_file(root, inode); |
3b951516 CM |
150 | if (num_bytes < cur_alloc_size) { |
151 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
152 | cur_alloc_size); | |
153 | break; | |
154 | } | |
c59f8951 CM |
155 | num_bytes -= cur_alloc_size; |
156 | alloc_hint = ins.objectid + ins.offset; | |
157 | start += cur_alloc_size; | |
b888db2b | 158 | } |
d1310b2e CM |
159 | btrfs_drop_extent_cache(inode, orig_start, |
160 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 161 | btrfs_add_ordered_inode(inode); |
9069218d | 162 | btrfs_update_inode(trans, root, inode); |
b888db2b CM |
163 | out: |
164 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
165 | return ret; |
166 | } | |
167 | ||
168 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
169 | { | |
170 | u64 extent_start; | |
171 | u64 extent_end; | |
172 | u64 bytenr; | |
173 | u64 cow_end; | |
1832a6d5 | 174 | u64 loops = 0; |
c31f8830 | 175 | u64 total_fs_bytes; |
be20aa9d | 176 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a68d5933 | 177 | struct btrfs_block_group_cache *block_group; |
be20aa9d CM |
178 | struct extent_buffer *leaf; |
179 | int found_type; | |
180 | struct btrfs_path *path; | |
181 | struct btrfs_file_extent_item *item; | |
182 | int ret; | |
183 | int err; | |
184 | struct btrfs_key found_key; | |
185 | ||
c31f8830 | 186 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
187 | path = btrfs_alloc_path(); |
188 | BUG_ON(!path); | |
189 | again: | |
190 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
191 | inode->i_ino, start, 0); | |
192 | if (ret < 0) { | |
193 | btrfs_free_path(path); | |
194 | return ret; | |
195 | } | |
196 | ||
197 | cow_end = end; | |
198 | if (ret != 0) { | |
199 | if (path->slots[0] == 0) | |
200 | goto not_found; | |
201 | path->slots[0]--; | |
202 | } | |
203 | ||
204 | leaf = path->nodes[0]; | |
205 | item = btrfs_item_ptr(leaf, path->slots[0], | |
206 | struct btrfs_file_extent_item); | |
207 | ||
208 | /* are we inside the extent that was found? */ | |
209 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
210 | found_type = btrfs_key_type(&found_key); | |
211 | if (found_key.objectid != inode->i_ino || | |
bbaf549e | 212 | found_type != BTRFS_EXTENT_DATA_KEY) |
be20aa9d | 213 | goto not_found; |
be20aa9d CM |
214 | |
215 | found_type = btrfs_file_extent_type(leaf, item); | |
216 | extent_start = found_key.offset; | |
217 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
218 | u64 extent_num_bytes; |
219 | ||
220 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
221 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
222 | err = 0; |
223 | ||
1832a6d5 CM |
224 | if (loops && start != extent_start) |
225 | goto not_found; | |
226 | ||
be20aa9d CM |
227 | if (start < extent_start || start >= extent_end) |
228 | goto not_found; | |
229 | ||
230 | cow_end = min(end, extent_end - 1); | |
231 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
232 | if (bytenr == 0) | |
233 | goto not_found; | |
234 | ||
a68d5933 CM |
235 | if (btrfs_count_snapshots_in_path(root, path, inode->i_ino, |
236 | bytenr) != 1) { | |
237 | goto not_found; | |
238 | } | |
239 | ||
c31f8830 CM |
240 | /* |
241 | * we may be called by the resizer, make sure we're inside | |
242 | * the limits of the FS | |
243 | */ | |
a68d5933 CM |
244 | block_group = btrfs_lookup_block_group(root->fs_info, |
245 | bytenr); | |
246 | if (!block_group || block_group->ro) | |
c31f8830 CM |
247 | goto not_found; |
248 | ||
be20aa9d | 249 | start = extent_end; |
bd09835d | 250 | } else { |
be20aa9d CM |
251 | goto not_found; |
252 | } | |
253 | loop: | |
254 | if (start > end) { | |
255 | btrfs_free_path(path); | |
256 | return 0; | |
257 | } | |
258 | btrfs_release_path(root, path); | |
1832a6d5 | 259 | loops++; |
be20aa9d CM |
260 | goto again; |
261 | ||
262 | not_found: | |
bbaf549e CM |
263 | cow_file_range(inode, start, end); |
264 | start = end + 1; | |
be20aa9d CM |
265 | goto loop; |
266 | } | |
267 | ||
268 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
269 | { | |
270 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
271 | int ret; | |
a2135011 | 272 | |
b98b6767 Y |
273 | if (btrfs_test_opt(root, NODATACOW) || |
274 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
275 | ret = run_delalloc_nocow(inode, start, end); |
276 | else | |
277 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 278 | |
b888db2b CM |
279 | return ret; |
280 | } | |
281 | ||
291d673e | 282 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 283 | unsigned long old, unsigned long bits) |
291d673e | 284 | { |
bcbfce8a | 285 | unsigned long flags; |
b0c68f8b | 286 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 287 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a | 288 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
9069218d | 289 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e | 290 | root->fs_info->delalloc_bytes += end - start + 1; |
bcbfce8a | 291 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
292 | } |
293 | return 0; | |
294 | } | |
295 | ||
296 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 297 | unsigned long old, unsigned long bits) |
291d673e | 298 | { |
b0c68f8b | 299 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 300 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a CM |
301 | unsigned long flags; |
302 | ||
303 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
b0c68f8b CM |
304 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
305 | printk("warning: delalloc account %Lu %Lu\n", | |
306 | end - start + 1, root->fs_info->delalloc_bytes); | |
307 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 308 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
309 | } else { |
310 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 311 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 312 | } |
bcbfce8a | 313 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
314 | } |
315 | return 0; | |
316 | } | |
317 | ||
239b14b3 CM |
318 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
319 | size_t size, struct bio *bio) | |
320 | { | |
321 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
322 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 323 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
324 | u64 length = 0; |
325 | u64 map_length; | |
239b14b3 CM |
326 | int ret; |
327 | ||
f2d8d74d | 328 | length = bio->bi_size; |
239b14b3 CM |
329 | map_tree = &root->fs_info->mapping_tree; |
330 | map_length = length; | |
cea9e445 | 331 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 332 | &map_length, NULL, 0); |
cea9e445 | 333 | |
239b14b3 | 334 | if (map_length < length + size) { |
239b14b3 CM |
335 | return 1; |
336 | } | |
337 | return 0; | |
338 | } | |
339 | ||
44b8bd7e | 340 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 341 | int mirror_num) |
065631f6 | 342 | { |
065631f6 CM |
343 | struct btrfs_root *root = BTRFS_I(inode)->root; |
344 | struct btrfs_trans_handle *trans; | |
345 | int ret = 0; | |
e015640f CM |
346 | char *sums = NULL; |
347 | ||
348 | ret = btrfs_csum_one_bio(root, bio, &sums); | |
349 | BUG_ON(ret); | |
065631f6 | 350 | |
44b8bd7e | 351 | trans = btrfs_start_transaction(root, 1); |
e015640f | 352 | |
44b8bd7e | 353 | btrfs_set_trans_block_group(trans, inode); |
e015640f CM |
354 | btrfs_csum_file_blocks(trans, root, inode, bio, sums); |
355 | ||
44b8bd7e CM |
356 | ret = btrfs_end_transaction(trans, root); |
357 | BUG_ON(ret); | |
e015640f CM |
358 | |
359 | kfree(sums); | |
360 | ||
8b712842 | 361 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
362 | } |
363 | ||
364 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
365 | int mirror_num) | |
366 | { | |
367 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
368 | int ret = 0; | |
369 | ||
22c59948 CM |
370 | if (!(rw & (1 << BIO_RW))) { |
371 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
372 | BUG_ON(ret); | |
0b86a832 CM |
373 | goto mapit; |
374 | } | |
065631f6 CM |
375 | |
376 | if (btrfs_test_opt(root, NODATASUM) || | |
0b86a832 CM |
377 | btrfs_test_flag(inode, NODATASUM)) { |
378 | goto mapit; | |
379 | } | |
065631f6 | 380 | |
44b8bd7e CM |
381 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
382 | inode, rw, bio, mirror_num, | |
383 | __btrfs_submit_bio_hook); | |
0b86a832 | 384 | mapit: |
8b712842 | 385 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 386 | } |
6885f308 | 387 | |
07157aac CM |
388 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
389 | { | |
390 | int ret = 0; | |
391 | struct inode *inode = page->mapping->host; | |
392 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 393 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
394 | struct btrfs_csum_item *item; |
395 | struct btrfs_path *path = NULL; | |
ff79f819 | 396 | u32 csum; |
699122f5 | 397 | |
b98b6767 Y |
398 | if (btrfs_test_opt(root, NODATASUM) || |
399 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 400 | return 0; |
699122f5 | 401 | |
07157aac CM |
402 | path = btrfs_alloc_path(); |
403 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
404 | if (IS_ERR(item)) { | |
405 | ret = PTR_ERR(item); | |
406 | /* a csum that isn't present is a preallocated region. */ | |
407 | if (ret == -ENOENT || ret == -EFBIG) | |
408 | ret = 0; | |
ff79f819 | 409 | csum = 0; |
aadfeb6e | 410 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
411 | goto out; |
412 | } | |
ff79f819 CM |
413 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
414 | BTRFS_CRC32_SIZE); | |
d1310b2e | 415 | set_state_private(io_tree, start, csum); |
07157aac CM |
416 | out: |
417 | if (path) | |
418 | btrfs_free_path(path); | |
07157aac CM |
419 | return ret; |
420 | } | |
421 | ||
7e38326f CM |
422 | struct io_failure_record { |
423 | struct page *page; | |
424 | u64 start; | |
425 | u64 len; | |
426 | u64 logical; | |
427 | int last_mirror; | |
428 | }; | |
429 | ||
1259ab75 CM |
430 | int btrfs_io_failed_hook(struct bio *failed_bio, |
431 | struct page *page, u64 start, u64 end, | |
432 | struct extent_state *state) | |
7e38326f CM |
433 | { |
434 | struct io_failure_record *failrec = NULL; | |
435 | u64 private; | |
436 | struct extent_map *em; | |
437 | struct inode *inode = page->mapping->host; | |
438 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 439 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
440 | struct bio *bio; |
441 | int num_copies; | |
442 | int ret; | |
1259ab75 | 443 | int rw; |
7e38326f CM |
444 | u64 logical; |
445 | ||
446 | ret = get_state_private(failure_tree, start, &private); | |
447 | if (ret) { | |
7e38326f CM |
448 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
449 | if (!failrec) | |
450 | return -ENOMEM; | |
451 | failrec->start = start; | |
452 | failrec->len = end - start + 1; | |
453 | failrec->last_mirror = 0; | |
454 | ||
3b951516 CM |
455 | spin_lock(&em_tree->lock); |
456 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
457 | if (em->start > start || em->start + em->len < start) { | |
458 | free_extent_map(em); | |
459 | em = NULL; | |
460 | } | |
461 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
462 | |
463 | if (!em || IS_ERR(em)) { | |
464 | kfree(failrec); | |
465 | return -EIO; | |
466 | } | |
467 | logical = start - em->start; | |
468 | logical = em->block_start + logical; | |
469 | failrec->logical = logical; | |
470 | free_extent_map(em); | |
471 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
472 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
473 | set_state_private(failure_tree, start, |
474 | (u64)(unsigned long)failrec); | |
7e38326f | 475 | } else { |
587f7704 | 476 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
477 | } |
478 | num_copies = btrfs_num_copies( | |
479 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
480 | failrec->logical, failrec->len); | |
481 | failrec->last_mirror++; | |
482 | if (!state) { | |
483 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
484 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
485 | failrec->start, | |
486 | EXTENT_LOCKED); | |
487 | if (state && state->start != failrec->start) | |
488 | state = NULL; | |
489 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
490 | } | |
491 | if (!state || failrec->last_mirror > num_copies) { | |
492 | set_state_private(failure_tree, failrec->start, 0); | |
493 | clear_extent_bits(failure_tree, failrec->start, | |
494 | failrec->start + failrec->len - 1, | |
495 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
496 | kfree(failrec); | |
497 | return -EIO; | |
498 | } | |
499 | bio = bio_alloc(GFP_NOFS, 1); | |
500 | bio->bi_private = state; | |
501 | bio->bi_end_io = failed_bio->bi_end_io; | |
502 | bio->bi_sector = failrec->logical >> 9; | |
503 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 504 | bio->bi_size = 0; |
7e38326f | 505 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
1259ab75 CM |
506 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
507 | rw = WRITE; | |
508 | else | |
509 | rw = READ; | |
510 | ||
511 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
512 | failrec->last_mirror); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | int btrfs_clean_io_failures(struct inode *inode, u64 start) | |
517 | { | |
518 | u64 private; | |
519 | u64 private_failure; | |
520 | struct io_failure_record *failure; | |
521 | int ret; | |
522 | ||
523 | private = 0; | |
524 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
525 | (u64)-1, 1, EXTENT_DIRTY)) { | |
526 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
527 | start, &private_failure); | |
528 | if (ret == 0) { | |
529 | failure = (struct io_failure_record *)(unsigned long) | |
530 | private_failure; | |
531 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
532 | failure->start, 0); | |
533 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
534 | failure->start, | |
535 | failure->start + failure->len - 1, | |
536 | EXTENT_DIRTY | EXTENT_LOCKED, | |
537 | GFP_NOFS); | |
538 | kfree(failure); | |
539 | } | |
540 | } | |
7e38326f CM |
541 | return 0; |
542 | } | |
543 | ||
70dec807 CM |
544 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
545 | struct extent_state *state) | |
07157aac | 546 | { |
35ebb934 | 547 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 548 | struct inode *inode = page->mapping->host; |
d1310b2e | 549 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 550 | char *kaddr; |
aadfeb6e | 551 | u64 private = ~(u32)0; |
07157aac | 552 | int ret; |
ff79f819 CM |
553 | struct btrfs_root *root = BTRFS_I(inode)->root; |
554 | u32 csum = ~(u32)0; | |
bbf0d006 | 555 | unsigned long flags; |
d1310b2e | 556 | |
b98b6767 Y |
557 | if (btrfs_test_opt(root, NODATASUM) || |
558 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 559 | return 0; |
c2e639f0 | 560 | if (state && state->start == start) { |
70dec807 CM |
561 | private = state->private; |
562 | ret = 0; | |
563 | } else { | |
564 | ret = get_state_private(io_tree, start, &private); | |
565 | } | |
bbf0d006 | 566 | local_irq_save(flags); |
07157aac CM |
567 | kaddr = kmap_atomic(page, KM_IRQ0); |
568 | if (ret) { | |
569 | goto zeroit; | |
570 | } | |
ff79f819 CM |
571 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
572 | btrfs_csum_final(csum, (char *)&csum); | |
573 | if (csum != private) { | |
07157aac CM |
574 | goto zeroit; |
575 | } | |
576 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 577 | local_irq_restore(flags); |
7e38326f CM |
578 | |
579 | /* if the io failure tree for this inode is non-empty, | |
580 | * check to see if we've recovered from a failed IO | |
581 | */ | |
1259ab75 | 582 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
583 | return 0; |
584 | ||
585 | zeroit: | |
aadfeb6e CM |
586 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
587 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
588 | private); | |
db94535d CM |
589 | memset(kaddr + offset, 1, end - start + 1); |
590 | flush_dcache_page(page); | |
07157aac | 591 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 592 | local_irq_restore(flags); |
3b951516 CM |
593 | if (private == 0) |
594 | return 0; | |
7e38326f | 595 | return -EIO; |
07157aac | 596 | } |
b888db2b | 597 | |
39279cc3 CM |
598 | void btrfs_read_locked_inode(struct inode *inode) |
599 | { | |
600 | struct btrfs_path *path; | |
5f39d397 | 601 | struct extent_buffer *leaf; |
39279cc3 | 602 | struct btrfs_inode_item *inode_item; |
0b86a832 | 603 | struct btrfs_timespec *tspec; |
39279cc3 CM |
604 | struct btrfs_root *root = BTRFS_I(inode)->root; |
605 | struct btrfs_key location; | |
606 | u64 alloc_group_block; | |
618e21d5 | 607 | u32 rdev; |
39279cc3 CM |
608 | int ret; |
609 | ||
610 | path = btrfs_alloc_path(); | |
611 | BUG_ON(!path); | |
39279cc3 | 612 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 613 | |
39279cc3 | 614 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 615 | if (ret) |
39279cc3 | 616 | goto make_bad; |
39279cc3 | 617 | |
5f39d397 CM |
618 | leaf = path->nodes[0]; |
619 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
620 | struct btrfs_inode_item); | |
621 | ||
622 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
623 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
624 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
625 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
626 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
627 | ||
628 | tspec = btrfs_inode_atime(inode_item); | |
629 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
630 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
631 | ||
632 | tspec = btrfs_inode_mtime(inode_item); | |
633 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
634 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
635 | ||
636 | tspec = btrfs_inode_ctime(inode_item); | |
637 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
638 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
639 | ||
640 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
641 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 642 | inode->i_rdev = 0; |
5f39d397 CM |
643 | rdev = btrfs_inode_rdev(leaf, inode_item); |
644 | ||
645 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
646 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
647 | alloc_group_block); | |
b98b6767 | 648 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
649 | if (!BTRFS_I(inode)->block_group) { |
650 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
651 | NULL, 0, |
652 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 653 | } |
39279cc3 CM |
654 | btrfs_free_path(path); |
655 | inode_item = NULL; | |
656 | ||
39279cc3 | 657 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
658 | case S_IFREG: |
659 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 660 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 661 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
662 | inode->i_fop = &btrfs_file_operations; |
663 | inode->i_op = &btrfs_file_inode_operations; | |
664 | break; | |
665 | case S_IFDIR: | |
666 | inode->i_fop = &btrfs_dir_file_operations; | |
667 | if (root == root->fs_info->tree_root) | |
668 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
669 | else | |
670 | inode->i_op = &btrfs_dir_inode_operations; | |
671 | break; | |
672 | case S_IFLNK: | |
673 | inode->i_op = &btrfs_symlink_inode_operations; | |
674 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 675 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 676 | break; |
618e21d5 JB |
677 | default: |
678 | init_special_inode(inode, inode->i_mode, rdev); | |
679 | break; | |
39279cc3 CM |
680 | } |
681 | return; | |
682 | ||
683 | make_bad: | |
39279cc3 | 684 | btrfs_free_path(path); |
39279cc3 CM |
685 | make_bad_inode(inode); |
686 | } | |
687 | ||
5f39d397 CM |
688 | static void fill_inode_item(struct extent_buffer *leaf, |
689 | struct btrfs_inode_item *item, | |
39279cc3 CM |
690 | struct inode *inode) |
691 | { | |
5f39d397 CM |
692 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
693 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
694 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
695 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
696 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
697 | ||
698 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
699 | inode->i_atime.tv_sec); | |
700 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
701 | inode->i_atime.tv_nsec); | |
702 | ||
703 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
704 | inode->i_mtime.tv_sec); | |
705 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
706 | inode->i_mtime.tv_nsec); | |
707 | ||
708 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
709 | inode->i_ctime.tv_sec); | |
710 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
711 | inode->i_ctime.tv_nsec); | |
712 | ||
713 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
714 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
715 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 716 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 717 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
718 | BTRFS_I(inode)->block_group->key.objectid); |
719 | } | |
720 | ||
a52d9a80 | 721 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
722 | struct btrfs_root *root, |
723 | struct inode *inode) | |
724 | { | |
725 | struct btrfs_inode_item *inode_item; | |
726 | struct btrfs_path *path; | |
5f39d397 | 727 | struct extent_buffer *leaf; |
39279cc3 CM |
728 | int ret; |
729 | ||
730 | path = btrfs_alloc_path(); | |
731 | BUG_ON(!path); | |
39279cc3 CM |
732 | ret = btrfs_lookup_inode(trans, root, path, |
733 | &BTRFS_I(inode)->location, 1); | |
734 | if (ret) { | |
735 | if (ret > 0) | |
736 | ret = -ENOENT; | |
737 | goto failed; | |
738 | } | |
739 | ||
5f39d397 CM |
740 | leaf = path->nodes[0]; |
741 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
742 | struct btrfs_inode_item); |
743 | ||
5f39d397 CM |
744 | fill_inode_item(leaf, inode_item, inode); |
745 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 746 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
747 | ret = 0; |
748 | failed: | |
39279cc3 CM |
749 | btrfs_free_path(path); |
750 | return ret; | |
751 | } | |
752 | ||
753 | ||
754 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
755 | struct btrfs_root *root, | |
756 | struct inode *dir, | |
757 | struct dentry *dentry) | |
758 | { | |
759 | struct btrfs_path *path; | |
760 | const char *name = dentry->d_name.name; | |
761 | int name_len = dentry->d_name.len; | |
762 | int ret = 0; | |
5f39d397 | 763 | struct extent_buffer *leaf; |
39279cc3 | 764 | struct btrfs_dir_item *di; |
5f39d397 | 765 | struct btrfs_key key; |
39279cc3 CM |
766 | |
767 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
768 | if (!path) { |
769 | ret = -ENOMEM; | |
770 | goto err; | |
771 | } | |
772 | ||
39279cc3 CM |
773 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
774 | name, name_len, -1); | |
775 | if (IS_ERR(di)) { | |
776 | ret = PTR_ERR(di); | |
777 | goto err; | |
778 | } | |
779 | if (!di) { | |
780 | ret = -ENOENT; | |
781 | goto err; | |
782 | } | |
5f39d397 CM |
783 | leaf = path->nodes[0]; |
784 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 785 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
786 | if (ret) |
787 | goto err; | |
39279cc3 CM |
788 | btrfs_release_path(root, path); |
789 | ||
790 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 791 | key.objectid, name, name_len, -1); |
39279cc3 CM |
792 | if (IS_ERR(di)) { |
793 | ret = PTR_ERR(di); | |
794 | goto err; | |
795 | } | |
796 | if (!di) { | |
797 | ret = -ENOENT; | |
798 | goto err; | |
799 | } | |
800 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
925baedd | 801 | btrfs_release_path(root, path); |
39279cc3 CM |
802 | |
803 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
804 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
805 | dentry->d_inode->i_ino, | |
806 | dentry->d_parent->d_inode->i_ino); | |
807 | if (ret) { | |
808 | printk("failed to delete reference to %.*s, " | |
809 | "inode %lu parent %lu\n", name_len, name, | |
810 | dentry->d_inode->i_ino, | |
811 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 812 | } |
39279cc3 CM |
813 | err: |
814 | btrfs_free_path(path); | |
815 | if (!ret) { | |
816 | dir->i_size -= name_len * 2; | |
79c44584 | 817 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 818 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
819 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
820 | dentry->d_inode->i_nlink--; | |
821 | #else | |
39279cc3 | 822 | drop_nlink(dentry->d_inode); |
6da6abae | 823 | #endif |
54aa1f4d | 824 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
825 | dir->i_sb->s_dirt = 1; |
826 | } | |
827 | return ret; | |
828 | } | |
829 | ||
830 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
831 | { | |
832 | struct btrfs_root *root; | |
833 | struct btrfs_trans_handle *trans; | |
2da98f00 | 834 | struct inode *inode = dentry->d_inode; |
39279cc3 | 835 | int ret; |
1832a6d5 | 836 | unsigned long nr = 0; |
39279cc3 CM |
837 | |
838 | root = BTRFS_I(dir)->root; | |
1832a6d5 CM |
839 | |
840 | ret = btrfs_check_free_space(root, 1, 1); | |
841 | if (ret) | |
842 | goto fail; | |
843 | ||
39279cc3 | 844 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 845 | |
39279cc3 CM |
846 | btrfs_set_trans_block_group(trans, dir); |
847 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 848 | nr = trans->blocks_used; |
5f39d397 | 849 | |
2da98f00 | 850 | if (inode->i_nlink == 0) { |
2da98f00 CM |
851 | /* if the inode isn't linked anywhere, |
852 | * we don't need to worry about | |
853 | * data=ordered | |
854 | */ | |
e1b81e67 | 855 | btrfs_del_ordered_inode(inode); |
2da98f00 CM |
856 | } |
857 | ||
39279cc3 | 858 | btrfs_end_transaction(trans, root); |
1832a6d5 | 859 | fail: |
d3c2fdcf | 860 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 861 | btrfs_throttle(root); |
39279cc3 CM |
862 | return ret; |
863 | } | |
864 | ||
865 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
866 | { | |
867 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 868 | int err = 0; |
39279cc3 CM |
869 | int ret; |
870 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 871 | struct btrfs_trans_handle *trans; |
1832a6d5 | 872 | unsigned long nr = 0; |
39279cc3 | 873 | |
925baedd | 874 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) { |
134d4512 | 875 | return -ENOTEMPTY; |
925baedd | 876 | } |
134d4512 | 877 | |
1832a6d5 CM |
878 | ret = btrfs_check_free_space(root, 1, 1); |
879 | if (ret) | |
880 | goto fail; | |
881 | ||
39279cc3 CM |
882 | trans = btrfs_start_transaction(root, 1); |
883 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
884 | |
885 | /* now the directory is empty */ | |
886 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
887 | if (!err) { | |
888 | inode->i_size = 0; | |
889 | } | |
3954401f | 890 | |
d3c2fdcf | 891 | nr = trans->blocks_used; |
39279cc3 | 892 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 893 | fail: |
d3c2fdcf | 894 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 895 | btrfs_throttle(root); |
3954401f | 896 | |
39279cc3 CM |
897 | if (ret && !err) |
898 | err = ret; | |
899 | return err; | |
900 | } | |
901 | ||
39279cc3 CM |
902 | /* |
903 | * this can truncate away extent items, csum items and directory items. | |
904 | * It starts at a high offset and removes keys until it can't find | |
905 | * any higher than i_size. | |
906 | * | |
907 | * csum items that cross the new i_size are truncated to the new size | |
908 | * as well. | |
909 | */ | |
910 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
911 | struct btrfs_root *root, | |
85e21bac CM |
912 | struct inode *inode, |
913 | u32 min_type) | |
39279cc3 CM |
914 | { |
915 | int ret; | |
916 | struct btrfs_path *path; | |
917 | struct btrfs_key key; | |
5f39d397 | 918 | struct btrfs_key found_key; |
39279cc3 | 919 | u32 found_type; |
5f39d397 | 920 | struct extent_buffer *leaf; |
39279cc3 CM |
921 | struct btrfs_file_extent_item *fi; |
922 | u64 extent_start = 0; | |
db94535d | 923 | u64 extent_num_bytes = 0; |
39279cc3 | 924 | u64 item_end = 0; |
7bb86316 | 925 | u64 root_gen = 0; |
d8d5f3e1 | 926 | u64 root_owner = 0; |
39279cc3 CM |
927 | int found_extent; |
928 | int del_item; | |
85e21bac CM |
929 | int pending_del_nr = 0; |
930 | int pending_del_slot = 0; | |
179e29e4 | 931 | int extent_type = -1; |
3b951516 | 932 | u64 mask = root->sectorsize - 1; |
39279cc3 | 933 | |
3b951516 | 934 | btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 935 | path = btrfs_alloc_path(); |
3c69faec | 936 | path->reada = -1; |
39279cc3 | 937 | BUG_ON(!path); |
5f39d397 | 938 | |
39279cc3 CM |
939 | /* FIXME, add redo link to tree so we don't leak on crash */ |
940 | key.objectid = inode->i_ino; | |
941 | key.offset = (u64)-1; | |
5f39d397 CM |
942 | key.type = (u8)-1; |
943 | ||
85e21bac CM |
944 | btrfs_init_path(path); |
945 | search_again: | |
946 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
947 | if (ret < 0) { | |
948 | goto error; | |
949 | } | |
950 | if (ret > 0) { | |
951 | BUG_ON(path->slots[0] == 0); | |
952 | path->slots[0]--; | |
953 | } | |
954 | ||
39279cc3 | 955 | while(1) { |
39279cc3 | 956 | fi = NULL; |
5f39d397 CM |
957 | leaf = path->nodes[0]; |
958 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
959 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 960 | |
5f39d397 | 961 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 962 | break; |
5f39d397 | 963 | |
85e21bac | 964 | if (found_type < min_type) |
39279cc3 CM |
965 | break; |
966 | ||
5f39d397 | 967 | item_end = found_key.offset; |
39279cc3 | 968 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 969 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 970 | struct btrfs_file_extent_item); |
179e29e4 CM |
971 | extent_type = btrfs_file_extent_type(leaf, fi); |
972 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 973 | item_end += |
db94535d | 974 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
975 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
976 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
977 | path->slots[0]); | |
978 | item_end += btrfs_file_extent_inline_len(leaf, | |
979 | item); | |
39279cc3 | 980 | } |
008630c1 | 981 | item_end--; |
39279cc3 CM |
982 | } |
983 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
984 | ret = btrfs_csum_truncate(trans, root, path, | |
985 | inode->i_size); | |
986 | BUG_ON(ret); | |
987 | } | |
008630c1 | 988 | if (item_end < inode->i_size) { |
b888db2b CM |
989 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
990 | found_type = BTRFS_INODE_ITEM_KEY; | |
991 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
992 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
993 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
994 | found_type = BTRFS_XATTR_ITEM_KEY; | |
995 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
996 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
997 | } else if (found_type) { |
998 | found_type--; | |
999 | } else { | |
1000 | break; | |
39279cc3 | 1001 | } |
a61721d5 | 1002 | btrfs_set_key_type(&key, found_type); |
85e21bac | 1003 | goto next; |
39279cc3 | 1004 | } |
5f39d397 | 1005 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
1006 | del_item = 1; |
1007 | else | |
1008 | del_item = 0; | |
1009 | found_extent = 0; | |
1010 | ||
1011 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1012 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1013 | goto delete; | |
1014 | ||
1015 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1016 | u64 num_dec; |
db94535d | 1017 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1018 | if (!del_item) { |
db94535d CM |
1019 | u64 orig_num_bytes = |
1020 | btrfs_file_extent_num_bytes(leaf, fi); | |
1021 | extent_num_bytes = inode->i_size - | |
5f39d397 | 1022 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1023 | extent_num_bytes = extent_num_bytes & |
1024 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1025 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1026 | extent_num_bytes); | |
1027 | num_dec = (orig_num_bytes - | |
9069218d CM |
1028 | extent_num_bytes); |
1029 | if (extent_start != 0) | |
1030 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 1031 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1032 | } else { |
db94535d CM |
1033 | extent_num_bytes = |
1034 | btrfs_file_extent_disk_num_bytes(leaf, | |
1035 | fi); | |
39279cc3 | 1036 | /* FIXME blocksize != 4096 */ |
9069218d | 1037 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1038 | if (extent_start != 0) { |
1039 | found_extent = 1; | |
9069218d | 1040 | dec_i_blocks(inode, num_dec); |
39279cc3 | 1041 | } |
d8d5f3e1 CM |
1042 | root_gen = btrfs_header_generation(leaf); |
1043 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 1044 | } |
9069218d CM |
1045 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1046 | if (!del_item) { | |
1047 | u32 newsize = inode->i_size - found_key.offset; | |
1048 | dec_i_blocks(inode, item_end + 1 - | |
1049 | found_key.offset - newsize); | |
1050 | newsize = | |
1051 | btrfs_file_extent_calc_inline_size(newsize); | |
1052 | ret = btrfs_truncate_item(trans, root, path, | |
1053 | newsize, 1); | |
1054 | BUG_ON(ret); | |
1055 | } else { | |
1056 | dec_i_blocks(inode, item_end + 1 - | |
1057 | found_key.offset); | |
1058 | } | |
39279cc3 | 1059 | } |
179e29e4 | 1060 | delete: |
39279cc3 | 1061 | if (del_item) { |
85e21bac CM |
1062 | if (!pending_del_nr) { |
1063 | /* no pending yet, add ourselves */ | |
1064 | pending_del_slot = path->slots[0]; | |
1065 | pending_del_nr = 1; | |
1066 | } else if (pending_del_nr && | |
1067 | path->slots[0] + 1 == pending_del_slot) { | |
1068 | /* hop on the pending chunk */ | |
1069 | pending_del_nr++; | |
1070 | pending_del_slot = path->slots[0]; | |
1071 | } else { | |
1072 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1073 | } | |
39279cc3 CM |
1074 | } else { |
1075 | break; | |
1076 | } | |
39279cc3 CM |
1077 | if (found_extent) { |
1078 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1079 | extent_num_bytes, |
d8d5f3e1 | 1080 | root_owner, |
7bb86316 CM |
1081 | root_gen, inode->i_ino, |
1082 | found_key.offset, 0); | |
39279cc3 CM |
1083 | BUG_ON(ret); |
1084 | } | |
85e21bac CM |
1085 | next: |
1086 | if (path->slots[0] == 0) { | |
1087 | if (pending_del_nr) | |
1088 | goto del_pending; | |
1089 | btrfs_release_path(root, path); | |
1090 | goto search_again; | |
1091 | } | |
1092 | ||
1093 | path->slots[0]--; | |
1094 | if (pending_del_nr && | |
1095 | path->slots[0] + 1 != pending_del_slot) { | |
1096 | struct btrfs_key debug; | |
1097 | del_pending: | |
1098 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1099 | pending_del_slot); | |
1100 | ret = btrfs_del_items(trans, root, path, | |
1101 | pending_del_slot, | |
1102 | pending_del_nr); | |
1103 | BUG_ON(ret); | |
1104 | pending_del_nr = 0; | |
1105 | btrfs_release_path(root, path); | |
1106 | goto search_again; | |
1107 | } | |
39279cc3 CM |
1108 | } |
1109 | ret = 0; | |
1110 | error: | |
85e21bac CM |
1111 | if (pending_del_nr) { |
1112 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1113 | pending_del_nr); | |
1114 | } | |
39279cc3 CM |
1115 | btrfs_free_path(path); |
1116 | inode->i_sb->s_dirt = 1; | |
1117 | return ret; | |
1118 | } | |
1119 | ||
b888db2b | 1120 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
1121 | size_t zero_start) |
1122 | { | |
1123 | char *kaddr; | |
d1310b2e | 1124 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 1125 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 1126 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 1127 | int ret = 0; |
a52d9a80 | 1128 | |
190662b2 | 1129 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 1130 | set_page_extent_mapped(page); |
a52d9a80 | 1131 | |
d1310b2e | 1132 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 1133 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 1134 | page_end, GFP_NOFS); |
1832a6d5 | 1135 | |
a52d9a80 | 1136 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 1137 | kaddr = kmap(page); |
a52d9a80 CM |
1138 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
1139 | flush_dcache_page(page); | |
b888db2b | 1140 | kunmap(page); |
a52d9a80 | 1141 | } |
b888db2b | 1142 | set_page_dirty(page); |
d1310b2e | 1143 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 1144 | |
a52d9a80 CM |
1145 | return ret; |
1146 | } | |
1147 | ||
39279cc3 CM |
1148 | /* |
1149 | * taken from block_truncate_page, but does cow as it zeros out | |
1150 | * any bytes left in the last page in the file. | |
1151 | */ | |
1152 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1153 | { | |
1154 | struct inode *inode = mapping->host; | |
db94535d CM |
1155 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1156 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
1157 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1158 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1159 | struct page *page; | |
39279cc3 | 1160 | int ret = 0; |
a52d9a80 | 1161 | u64 page_start; |
39279cc3 CM |
1162 | |
1163 | if ((offset & (blocksize - 1)) == 0) | |
1164 | goto out; | |
1165 | ||
1166 | ret = -ENOMEM; | |
211c17f5 | 1167 | again: |
39279cc3 CM |
1168 | page = grab_cache_page(mapping, index); |
1169 | if (!page) | |
1170 | goto out; | |
39279cc3 | 1171 | if (!PageUptodate(page)) { |
9ebefb18 | 1172 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 1173 | lock_page(page); |
211c17f5 CM |
1174 | if (page->mapping != mapping) { |
1175 | unlock_page(page); | |
1176 | page_cache_release(page); | |
1177 | goto again; | |
1178 | } | |
39279cc3 CM |
1179 | if (!PageUptodate(page)) { |
1180 | ret = -EIO; | |
1181 | goto out; | |
1182 | } | |
1183 | } | |
a52d9a80 | 1184 | |
211c17f5 CM |
1185 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
1186 | wait_on_page_writeback(page); | |
b888db2b | 1187 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 1188 | |
39279cc3 CM |
1189 | unlock_page(page); |
1190 | page_cache_release(page); | |
1191 | out: | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1196 | { | |
1197 | struct inode *inode = dentry->d_inode; | |
1198 | int err; | |
1199 | ||
1200 | err = inode_change_ok(inode, attr); | |
1201 | if (err) | |
1202 | return err; | |
1203 | ||
1204 | if (S_ISREG(inode->i_mode) && | |
1205 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1206 | struct btrfs_trans_handle *trans; | |
1207 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1208 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1209 | |
5f39d397 | 1210 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1211 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1212 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1213 | u64 hole_size; |
179e29e4 | 1214 | u64 alloc_hint = 0; |
39279cc3 | 1215 | |
1b0f7c29 | 1216 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1217 | goto out; |
1218 | ||
1832a6d5 | 1219 | err = btrfs_check_free_space(root, 1, 0); |
1832a6d5 CM |
1220 | if (err) |
1221 | goto fail; | |
1222 | ||
39279cc3 CM |
1223 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1224 | ||
1b0f7c29 | 1225 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1226 | hole_size = block_end - hole_start; |
39279cc3 | 1227 | |
39279cc3 CM |
1228 | trans = btrfs_start_transaction(root, 1); |
1229 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1230 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1231 | hole_start, block_end, hole_start, |
3326d1b0 | 1232 | &alloc_hint); |
2bf5a725 | 1233 | |
179e29e4 CM |
1234 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1235 | err = btrfs_insert_file_extent(trans, root, | |
1236 | inode->i_ino, | |
5f56406a | 1237 | hole_start, 0, 0, |
f2eb0a24 | 1238 | hole_size, 0); |
d1310b2e | 1239 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1240 | (u64)-1); |
5f56406a | 1241 | btrfs_check_file(root, inode); |
179e29e4 | 1242 | } |
39279cc3 | 1243 | btrfs_end_transaction(trans, root); |
1b0f7c29 | 1244 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1245 | if (err) |
1246 | return err; | |
39279cc3 CM |
1247 | } |
1248 | out: | |
1249 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1250 | fail: |
39279cc3 CM |
1251 | return err; |
1252 | } | |
61295eb8 | 1253 | |
39279cc3 CM |
1254 | void btrfs_delete_inode(struct inode *inode) |
1255 | { | |
1256 | struct btrfs_trans_handle *trans; | |
1257 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1258 | unsigned long nr; |
39279cc3 CM |
1259 | int ret; |
1260 | ||
1261 | truncate_inode_pages(&inode->i_data, 0); | |
1262 | if (is_bad_inode(inode)) { | |
1263 | goto no_delete; | |
1264 | } | |
5f39d397 | 1265 | |
39279cc3 | 1266 | inode->i_size = 0; |
39279cc3 | 1267 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1268 | |
39279cc3 | 1269 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1270 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1271 | if (ret) |
1272 | goto no_delete_lock; | |
85e21bac | 1273 | |
d3c2fdcf | 1274 | nr = trans->blocks_used; |
85e21bac | 1275 | clear_inode(inode); |
5f39d397 | 1276 | |
39279cc3 | 1277 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1278 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1279 | btrfs_throttle(root); |
39279cc3 | 1280 | return; |
54aa1f4d CM |
1281 | |
1282 | no_delete_lock: | |
d3c2fdcf | 1283 | nr = trans->blocks_used; |
54aa1f4d | 1284 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1285 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1286 | btrfs_throttle(root); |
39279cc3 CM |
1287 | no_delete: |
1288 | clear_inode(inode); | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * this returns the key found in the dir entry in the location pointer. | |
1293 | * If no dir entries were found, location->objectid is 0. | |
1294 | */ | |
1295 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1296 | struct btrfs_key *location) | |
1297 | { | |
1298 | const char *name = dentry->d_name.name; | |
1299 | int namelen = dentry->d_name.len; | |
1300 | struct btrfs_dir_item *di; | |
1301 | struct btrfs_path *path; | |
1302 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1303 | int ret = 0; |
39279cc3 | 1304 | |
3954401f CM |
1305 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1306 | location->objectid = dir->i_ino; | |
1307 | location->type = BTRFS_INODE_ITEM_KEY; | |
1308 | location->offset = 0; | |
1309 | return 0; | |
1310 | } | |
39279cc3 CM |
1311 | path = btrfs_alloc_path(); |
1312 | BUG_ON(!path); | |
3954401f | 1313 | |
7a720536 | 1314 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1315 | struct btrfs_key key; |
1316 | struct extent_buffer *leaf; | |
1317 | u32 nritems; | |
1318 | int slot; | |
1319 | ||
1320 | key.objectid = dir->i_ino; | |
1321 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1322 | key.offset = 0; | |
1323 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1324 | BUG_ON(ret == 0); | |
1325 | ret = 0; | |
1326 | ||
1327 | leaf = path->nodes[0]; | |
1328 | slot = path->slots[0]; | |
1329 | nritems = btrfs_header_nritems(leaf); | |
1330 | if (slot >= nritems) | |
1331 | goto out_err; | |
1332 | ||
1333 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1334 | if (key.objectid != dir->i_ino || | |
1335 | key.type != BTRFS_INODE_REF_KEY) { | |
1336 | goto out_err; | |
1337 | } | |
1338 | location->objectid = key.offset; | |
1339 | location->type = BTRFS_INODE_ITEM_KEY; | |
1340 | location->offset = 0; | |
1341 | goto out; | |
1342 | } | |
1343 | ||
39279cc3 CM |
1344 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1345 | namelen, 0); | |
0d9f7f3e Y |
1346 | if (IS_ERR(di)) |
1347 | ret = PTR_ERR(di); | |
39279cc3 | 1348 | if (!di || IS_ERR(di)) { |
3954401f | 1349 | goto out_err; |
39279cc3 | 1350 | } |
5f39d397 | 1351 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1352 | out: |
39279cc3 CM |
1353 | btrfs_free_path(path); |
1354 | return ret; | |
3954401f CM |
1355 | out_err: |
1356 | location->objectid = 0; | |
1357 | goto out; | |
39279cc3 CM |
1358 | } |
1359 | ||
1360 | /* | |
1361 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1362 | * needs to be changed to reflect the root directory of the tree root. This | |
1363 | * is kind of like crossing a mount point. | |
1364 | */ | |
1365 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1366 | struct btrfs_key *location, | |
58176a96 JB |
1367 | struct btrfs_root **sub_root, |
1368 | struct dentry *dentry) | |
39279cc3 CM |
1369 | { |
1370 | struct btrfs_path *path; | |
1371 | struct btrfs_root_item *ri; | |
1372 | ||
1373 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1374 | return 0; | |
1375 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1376 | return 0; | |
1377 | ||
1378 | path = btrfs_alloc_path(); | |
1379 | BUG_ON(!path); | |
39279cc3 | 1380 | |
58176a96 JB |
1381 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1382 | dentry->d_name.name, | |
1383 | dentry->d_name.len); | |
39279cc3 CM |
1384 | if (IS_ERR(*sub_root)) |
1385 | return PTR_ERR(*sub_root); | |
1386 | ||
1387 | ri = &(*sub_root)->root_item; | |
1388 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1389 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1390 | location->offset = 0; | |
1391 | ||
1392 | btrfs_free_path(path); | |
39279cc3 CM |
1393 | return 0; |
1394 | } | |
1395 | ||
1396 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1397 | { | |
1398 | struct btrfs_iget_args *args = p; | |
1399 | inode->i_ino = args->ino; | |
1400 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1401 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e CM |
1402 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1403 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1404 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1405 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1406 | inode->i_mapping, GFP_NOFS); | |
81d7ed29 | 1407 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
39279cc3 CM |
1408 | return 0; |
1409 | } | |
1410 | ||
1411 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1412 | { | |
1413 | struct btrfs_iget_args *args = opaque; | |
1414 | return (args->ino == inode->i_ino && | |
1415 | args->root == BTRFS_I(inode)->root); | |
1416 | } | |
1417 | ||
dc17ff8f CM |
1418 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1419 | u64 root_objectid) | |
1420 | { | |
1421 | struct btrfs_iget_args args; | |
1422 | args.ino = objectid; | |
1423 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1424 | ||
1425 | if (!args.root) | |
1426 | return NULL; | |
1427 | ||
1428 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1429 | } | |
1430 | ||
39279cc3 CM |
1431 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1432 | struct btrfs_root *root) | |
1433 | { | |
1434 | struct inode *inode; | |
1435 | struct btrfs_iget_args args; | |
1436 | args.ino = objectid; | |
1437 | args.root = root; | |
1438 | ||
1439 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1440 | btrfs_init_locked_inode, | |
1441 | (void *)&args); | |
1442 | return inode; | |
1443 | } | |
1444 | ||
1445 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1446 | struct nameidata *nd) | |
1447 | { | |
1448 | struct inode * inode; | |
1449 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1450 | struct btrfs_root *root = bi->root; | |
1451 | struct btrfs_root *sub_root = root; | |
1452 | struct btrfs_key location; | |
1453 | int ret; | |
1454 | ||
1455 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1456 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1457 | |
39279cc3 | 1458 | ret = btrfs_inode_by_name(dir, dentry, &location); |
5f39d397 | 1459 | |
39279cc3 CM |
1460 | if (ret < 0) |
1461 | return ERR_PTR(ret); | |
5f39d397 | 1462 | |
39279cc3 CM |
1463 | inode = NULL; |
1464 | if (location.objectid) { | |
58176a96 JB |
1465 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1466 | dentry); | |
39279cc3 CM |
1467 | if (ret < 0) |
1468 | return ERR_PTR(ret); | |
1469 | if (ret > 0) | |
1470 | return ERR_PTR(-ENOENT); | |
1471 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1472 | sub_root); | |
1473 | if (!inode) | |
1474 | return ERR_PTR(-EACCES); | |
1475 | if (inode->i_state & I_NEW) { | |
1476 | /* the inode and parent dir are two different roots */ | |
1477 | if (sub_root != root) { | |
1478 | igrab(inode); | |
1479 | sub_root->inode = inode; | |
1480 | } | |
1481 | BTRFS_I(inode)->root = sub_root; | |
1482 | memcpy(&BTRFS_I(inode)->location, &location, | |
1483 | sizeof(location)); | |
1484 | btrfs_read_locked_inode(inode); | |
1485 | unlock_new_inode(inode); | |
1486 | } | |
1487 | } | |
1488 | return d_splice_alias(inode, dentry); | |
1489 | } | |
1490 | ||
39279cc3 CM |
1491 | static unsigned char btrfs_filetype_table[] = { |
1492 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1493 | }; | |
1494 | ||
1495 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1496 | { | |
6da6abae | 1497 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1498 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1499 | struct btrfs_item *item; | |
1500 | struct btrfs_dir_item *di; | |
1501 | struct btrfs_key key; | |
5f39d397 | 1502 | struct btrfs_key found_key; |
39279cc3 CM |
1503 | struct btrfs_path *path; |
1504 | int ret; | |
1505 | u32 nritems; | |
5f39d397 | 1506 | struct extent_buffer *leaf; |
39279cc3 CM |
1507 | int slot; |
1508 | int advance; | |
1509 | unsigned char d_type; | |
1510 | int over = 0; | |
1511 | u32 di_cur; | |
1512 | u32 di_total; | |
1513 | u32 di_len; | |
1514 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1515 | char tmp_name[32]; |
1516 | char *name_ptr; | |
1517 | int name_len; | |
39279cc3 CM |
1518 | |
1519 | /* FIXME, use a real flag for deciding about the key type */ | |
1520 | if (root->fs_info->tree_root == root) | |
1521 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1522 | |
3954401f CM |
1523 | /* special case for "." */ |
1524 | if (filp->f_pos == 0) { | |
1525 | over = filldir(dirent, ".", 1, | |
1526 | 1, inode->i_ino, | |
1527 | DT_DIR); | |
1528 | if (over) | |
1529 | return 0; | |
1530 | filp->f_pos = 1; | |
1531 | } | |
1532 | ||
39279cc3 | 1533 | key.objectid = inode->i_ino; |
3954401f CM |
1534 | path = btrfs_alloc_path(); |
1535 | path->reada = 2; | |
1536 | ||
1537 | /* special case for .., just use the back ref */ | |
1538 | if (filp->f_pos == 1) { | |
1539 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1540 | key.offset = 0; | |
1541 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1542 | BUG_ON(ret == 0); | |
1543 | leaf = path->nodes[0]; | |
1544 | slot = path->slots[0]; | |
1545 | nritems = btrfs_header_nritems(leaf); | |
1546 | if (slot >= nritems) { | |
1547 | btrfs_release_path(root, path); | |
1548 | goto read_dir_items; | |
1549 | } | |
1550 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1551 | btrfs_release_path(root, path); | |
1552 | if (found_key.objectid != key.objectid || | |
1553 | found_key.type != BTRFS_INODE_REF_KEY) | |
1554 | goto read_dir_items; | |
1555 | over = filldir(dirent, "..", 2, | |
1556 | 2, found_key.offset, DT_DIR); | |
1557 | if (over) | |
1558 | goto nopos; | |
1559 | filp->f_pos = 2; | |
1560 | } | |
1561 | ||
1562 | read_dir_items: | |
39279cc3 CM |
1563 | btrfs_set_key_type(&key, key_type); |
1564 | key.offset = filp->f_pos; | |
5f39d397 | 1565 | |
39279cc3 CM |
1566 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1567 | if (ret < 0) | |
1568 | goto err; | |
1569 | advance = 0; | |
39279cc3 | 1570 | while(1) { |
5f39d397 CM |
1571 | leaf = path->nodes[0]; |
1572 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1573 | slot = path->slots[0]; |
1574 | if (advance || slot >= nritems) { | |
1575 | if (slot >= nritems -1) { | |
39279cc3 CM |
1576 | ret = btrfs_next_leaf(root, path); |
1577 | if (ret) | |
1578 | break; | |
5f39d397 CM |
1579 | leaf = path->nodes[0]; |
1580 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1581 | slot = path->slots[0]; |
1582 | } else { | |
1583 | slot++; | |
1584 | path->slots[0]++; | |
1585 | } | |
1586 | } | |
1587 | advance = 1; | |
5f39d397 CM |
1588 | item = btrfs_item_nr(leaf, slot); |
1589 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1590 | ||
1591 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1592 | break; |
5f39d397 | 1593 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1594 | break; |
5f39d397 | 1595 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1596 | continue; |
5f39d397 CM |
1597 | |
1598 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1599 | advance = 1; |
1600 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1601 | di_cur = 0; | |
5f39d397 | 1602 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1603 | while(di_cur < di_total) { |
5f39d397 CM |
1604 | struct btrfs_key location; |
1605 | ||
1606 | name_len = btrfs_dir_name_len(leaf, di); | |
1607 | if (name_len < 32) { | |
1608 | name_ptr = tmp_name; | |
1609 | } else { | |
1610 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1611 | BUG_ON(!name_ptr); | |
1612 | } | |
1613 | read_extent_buffer(leaf, name_ptr, | |
1614 | (unsigned long)(di + 1), name_len); | |
1615 | ||
1616 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1617 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1618 | over = filldir(dirent, name_ptr, name_len, |
1619 | found_key.offset, | |
1620 | location.objectid, | |
39279cc3 | 1621 | d_type); |
5f39d397 CM |
1622 | |
1623 | if (name_ptr != tmp_name) | |
1624 | kfree(name_ptr); | |
1625 | ||
39279cc3 CM |
1626 | if (over) |
1627 | goto nopos; | |
5103e947 JB |
1628 | di_len = btrfs_dir_name_len(leaf, di) + |
1629 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1630 | di_cur += di_len; |
1631 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1632 | } | |
1633 | } | |
5e591a07 YZ |
1634 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1635 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1636 | else | |
1637 | filp->f_pos++; | |
39279cc3 CM |
1638 | nopos: |
1639 | ret = 0; | |
1640 | err: | |
39279cc3 | 1641 | btrfs_free_path(path); |
39279cc3 CM |
1642 | return ret; |
1643 | } | |
1644 | ||
1645 | int btrfs_write_inode(struct inode *inode, int wait) | |
1646 | { | |
1647 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1648 | struct btrfs_trans_handle *trans; | |
1649 | int ret = 0; | |
1650 | ||
1651 | if (wait) { | |
39279cc3 CM |
1652 | trans = btrfs_start_transaction(root, 1); |
1653 | btrfs_set_trans_block_group(trans, inode); | |
1654 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
1655 | } |
1656 | return ret; | |
1657 | } | |
1658 | ||
1659 | /* | |
54aa1f4d | 1660 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1661 | * inode changes. But, it is most likely to find the inode in cache. |
1662 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1663 | * to keep or drop this code. | |
1664 | */ | |
1665 | void btrfs_dirty_inode(struct inode *inode) | |
1666 | { | |
1667 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1668 | struct btrfs_trans_handle *trans; | |
1669 | ||
39279cc3 CM |
1670 | trans = btrfs_start_transaction(root, 1); |
1671 | btrfs_set_trans_block_group(trans, inode); | |
1672 | btrfs_update_inode(trans, root, inode); | |
1673 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
1674 | } |
1675 | ||
1676 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1677 | struct btrfs_root *root, | |
9c58309d CM |
1678 | const char *name, int name_len, |
1679 | u64 ref_objectid, | |
39279cc3 CM |
1680 | u64 objectid, |
1681 | struct btrfs_block_group_cache *group, | |
1682 | int mode) | |
1683 | { | |
1684 | struct inode *inode; | |
5f39d397 | 1685 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 1686 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 1687 | struct btrfs_key *location; |
5f39d397 | 1688 | struct btrfs_path *path; |
9c58309d CM |
1689 | struct btrfs_inode_ref *ref; |
1690 | struct btrfs_key key[2]; | |
1691 | u32 sizes[2]; | |
1692 | unsigned long ptr; | |
39279cc3 CM |
1693 | int ret; |
1694 | int owner; | |
1695 | ||
5f39d397 CM |
1696 | path = btrfs_alloc_path(); |
1697 | BUG_ON(!path); | |
1698 | ||
39279cc3 CM |
1699 | inode = new_inode(root->fs_info->sb); |
1700 | if (!inode) | |
1701 | return ERR_PTR(-ENOMEM); | |
1702 | ||
d1310b2e CM |
1703 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1704 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1705 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1706 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1707 | inode->i_mapping, GFP_NOFS); | |
81d7ed29 | 1708 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
9069218d | 1709 | BTRFS_I(inode)->delalloc_bytes = 0; |
39279cc3 | 1710 | BTRFS_I(inode)->root = root; |
b888db2b | 1711 | |
39279cc3 CM |
1712 | if (mode & S_IFDIR) |
1713 | owner = 0; | |
1714 | else | |
1715 | owner = 1; | |
6324fbf3 | 1716 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 1717 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
1718 | if (!new_inode_group) { |
1719 | printk("find_block group failed\n"); | |
1720 | new_inode_group = group; | |
1721 | } | |
1722 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 1723 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1724 | |
1725 | key[0].objectid = objectid; | |
1726 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1727 | key[0].offset = 0; | |
1728 | ||
1729 | key[1].objectid = objectid; | |
1730 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1731 | key[1].offset = ref_objectid; | |
1732 | ||
1733 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1734 | sizes[1] = name_len + sizeof(*ref); | |
1735 | ||
1736 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1737 | if (ret != 0) | |
5f39d397 CM |
1738 | goto fail; |
1739 | ||
9c58309d CM |
1740 | if (objectid > root->highest_inode) |
1741 | root->highest_inode = objectid; | |
1742 | ||
39279cc3 CM |
1743 | inode->i_uid = current->fsuid; |
1744 | inode->i_gid = current->fsgid; | |
1745 | inode->i_mode = mode; | |
1746 | inode->i_ino = objectid; | |
1747 | inode->i_blocks = 0; | |
1748 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1749 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1750 | struct btrfs_inode_item); | |
1751 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1752 | |
1753 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1754 | struct btrfs_inode_ref); | |
1755 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1756 | ptr = (unsigned long)(ref + 1); | |
1757 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1758 | ||
5f39d397 CM |
1759 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1760 | btrfs_free_path(path); | |
1761 | ||
39279cc3 CM |
1762 | location = &BTRFS_I(inode)->location; |
1763 | location->objectid = objectid; | |
39279cc3 CM |
1764 | location->offset = 0; |
1765 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1766 | ||
39279cc3 CM |
1767 | insert_inode_hash(inode); |
1768 | return inode; | |
5f39d397 CM |
1769 | fail: |
1770 | btrfs_free_path(path); | |
1771 | return ERR_PTR(ret); | |
39279cc3 CM |
1772 | } |
1773 | ||
1774 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1775 | { | |
1776 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1777 | } | |
1778 | ||
1779 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1780 | struct dentry *dentry, struct inode *inode, |
1781 | int add_backref) | |
39279cc3 CM |
1782 | { |
1783 | int ret; | |
1784 | struct btrfs_key key; | |
1785 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1786 | struct inode *parent_inode; |
5f39d397 | 1787 | |
39279cc3 | 1788 | key.objectid = inode->i_ino; |
39279cc3 CM |
1789 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1790 | key.offset = 0; | |
1791 | ||
1792 | ret = btrfs_insert_dir_item(trans, root, | |
1793 | dentry->d_name.name, dentry->d_name.len, | |
1794 | dentry->d_parent->d_inode->i_ino, | |
1795 | &key, btrfs_inode_type(inode)); | |
1796 | if (ret == 0) { | |
9c58309d CM |
1797 | if (add_backref) { |
1798 | ret = btrfs_insert_inode_ref(trans, root, | |
1799 | dentry->d_name.name, | |
1800 | dentry->d_name.len, | |
1801 | inode->i_ino, | |
1802 | dentry->d_parent->d_inode->i_ino); | |
1803 | } | |
79c44584 CM |
1804 | parent_inode = dentry->d_parent->d_inode; |
1805 | parent_inode->i_size += dentry->d_name.len * 2; | |
1806 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1807 | ret = btrfs_update_inode(trans, root, |
1808 | dentry->d_parent->d_inode); | |
1809 | } | |
1810 | return ret; | |
1811 | } | |
1812 | ||
1813 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1814 | struct dentry *dentry, struct inode *inode, |
1815 | int backref) | |
39279cc3 | 1816 | { |
9c58309d | 1817 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1818 | if (!err) { |
1819 | d_instantiate(dentry, inode); | |
1820 | return 0; | |
1821 | } | |
1822 | if (err > 0) | |
1823 | err = -EEXIST; | |
1824 | return err; | |
1825 | } | |
1826 | ||
618e21d5 JB |
1827 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1828 | int mode, dev_t rdev) | |
1829 | { | |
1830 | struct btrfs_trans_handle *trans; | |
1831 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1832 | struct inode *inode = NULL; |
618e21d5 JB |
1833 | int err; |
1834 | int drop_inode = 0; | |
1835 | u64 objectid; | |
1832a6d5 | 1836 | unsigned long nr = 0; |
618e21d5 JB |
1837 | |
1838 | if (!new_valid_dev(rdev)) | |
1839 | return -EINVAL; | |
1840 | ||
1832a6d5 CM |
1841 | err = btrfs_check_free_space(root, 1, 0); |
1842 | if (err) | |
1843 | goto fail; | |
1844 | ||
618e21d5 JB |
1845 | trans = btrfs_start_transaction(root, 1); |
1846 | btrfs_set_trans_block_group(trans, dir); | |
1847 | ||
1848 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1849 | if (err) { | |
1850 | err = -ENOSPC; | |
1851 | goto out_unlock; | |
1852 | } | |
1853 | ||
9c58309d CM |
1854 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1855 | dentry->d_name.len, | |
1856 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1857 | BTRFS_I(dir)->block_group, mode); |
1858 | err = PTR_ERR(inode); | |
1859 | if (IS_ERR(inode)) | |
1860 | goto out_unlock; | |
1861 | ||
1862 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1863 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1864 | if (err) |
1865 | drop_inode = 1; | |
1866 | else { | |
1867 | inode->i_op = &btrfs_special_inode_operations; | |
1868 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1869 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1870 | } |
1871 | dir->i_sb->s_dirt = 1; | |
1872 | btrfs_update_inode_block_group(trans, inode); | |
1873 | btrfs_update_inode_block_group(trans, dir); | |
1874 | out_unlock: | |
d3c2fdcf | 1875 | nr = trans->blocks_used; |
618e21d5 | 1876 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1877 | fail: |
618e21d5 JB |
1878 | if (drop_inode) { |
1879 | inode_dec_link_count(inode); | |
1880 | iput(inode); | |
1881 | } | |
d3c2fdcf | 1882 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1883 | btrfs_throttle(root); |
618e21d5 JB |
1884 | return err; |
1885 | } | |
1886 | ||
39279cc3 CM |
1887 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1888 | int mode, struct nameidata *nd) | |
1889 | { | |
1890 | struct btrfs_trans_handle *trans; | |
1891 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1892 | struct inode *inode = NULL; |
39279cc3 CM |
1893 | int err; |
1894 | int drop_inode = 0; | |
1832a6d5 | 1895 | unsigned long nr = 0; |
39279cc3 CM |
1896 | u64 objectid; |
1897 | ||
1832a6d5 CM |
1898 | err = btrfs_check_free_space(root, 1, 0); |
1899 | if (err) | |
1900 | goto fail; | |
39279cc3 CM |
1901 | trans = btrfs_start_transaction(root, 1); |
1902 | btrfs_set_trans_block_group(trans, dir); | |
1903 | ||
1904 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1905 | if (err) { | |
1906 | err = -ENOSPC; | |
1907 | goto out_unlock; | |
1908 | } | |
1909 | ||
9c58309d CM |
1910 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1911 | dentry->d_name.len, | |
1912 | dentry->d_parent->d_inode->i_ino, | |
1913 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1914 | err = PTR_ERR(inode); |
1915 | if (IS_ERR(inode)) | |
1916 | goto out_unlock; | |
1917 | ||
1918 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1919 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1920 | if (err) |
1921 | drop_inode = 1; | |
1922 | else { | |
1923 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1924 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
1925 | inode->i_fop = &btrfs_file_operations; |
1926 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1927 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1928 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1929 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1930 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1931 | inode->i_mapping, GFP_NOFS); | |
9069218d | 1932 | BTRFS_I(inode)->delalloc_bytes = 0; |
81d7ed29 | 1933 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
d1310b2e | 1934 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1935 | } |
1936 | dir->i_sb->s_dirt = 1; | |
1937 | btrfs_update_inode_block_group(trans, inode); | |
1938 | btrfs_update_inode_block_group(trans, dir); | |
1939 | out_unlock: | |
d3c2fdcf | 1940 | nr = trans->blocks_used; |
39279cc3 | 1941 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1942 | fail: |
39279cc3 CM |
1943 | if (drop_inode) { |
1944 | inode_dec_link_count(inode); | |
1945 | iput(inode); | |
1946 | } | |
d3c2fdcf | 1947 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1948 | btrfs_throttle(root); |
39279cc3 CM |
1949 | return err; |
1950 | } | |
1951 | ||
1952 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1953 | struct dentry *dentry) | |
1954 | { | |
1955 | struct btrfs_trans_handle *trans; | |
1956 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1957 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1958 | unsigned long nr = 0; |
39279cc3 CM |
1959 | int err; |
1960 | int drop_inode = 0; | |
1961 | ||
1962 | if (inode->i_nlink == 0) | |
1963 | return -ENOENT; | |
1964 | ||
6da6abae CM |
1965 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1966 | inode->i_nlink++; | |
1967 | #else | |
39279cc3 | 1968 | inc_nlink(inode); |
6da6abae | 1969 | #endif |
1832a6d5 CM |
1970 | err = btrfs_check_free_space(root, 1, 0); |
1971 | if (err) | |
1972 | goto fail; | |
39279cc3 | 1973 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1974 | |
39279cc3 CM |
1975 | btrfs_set_trans_block_group(trans, dir); |
1976 | atomic_inc(&inode->i_count); | |
9c58309d | 1977 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 1978 | |
39279cc3 CM |
1979 | if (err) |
1980 | drop_inode = 1; | |
5f39d397 | 1981 | |
39279cc3 CM |
1982 | dir->i_sb->s_dirt = 1; |
1983 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1984 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1985 | |
54aa1f4d CM |
1986 | if (err) |
1987 | drop_inode = 1; | |
39279cc3 | 1988 | |
d3c2fdcf | 1989 | nr = trans->blocks_used; |
39279cc3 | 1990 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1991 | fail: |
39279cc3 CM |
1992 | if (drop_inode) { |
1993 | inode_dec_link_count(inode); | |
1994 | iput(inode); | |
1995 | } | |
d3c2fdcf | 1996 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1997 | btrfs_throttle(root); |
39279cc3 CM |
1998 | return err; |
1999 | } | |
2000 | ||
39279cc3 CM |
2001 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2002 | { | |
b9d86667 | 2003 | struct inode *inode = NULL; |
39279cc3 CM |
2004 | struct btrfs_trans_handle *trans; |
2005 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2006 | int err = 0; | |
2007 | int drop_on_err = 0; | |
b9d86667 | 2008 | u64 objectid = 0; |
d3c2fdcf | 2009 | unsigned long nr = 1; |
39279cc3 | 2010 | |
1832a6d5 CM |
2011 | err = btrfs_check_free_space(root, 1, 0); |
2012 | if (err) | |
2013 | goto out_unlock; | |
2014 | ||
39279cc3 CM |
2015 | trans = btrfs_start_transaction(root, 1); |
2016 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2017 | |
39279cc3 CM |
2018 | if (IS_ERR(trans)) { |
2019 | err = PTR_ERR(trans); | |
2020 | goto out_unlock; | |
2021 | } | |
2022 | ||
2023 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2024 | if (err) { | |
2025 | err = -ENOSPC; | |
2026 | goto out_unlock; | |
2027 | } | |
2028 | ||
9c58309d CM |
2029 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2030 | dentry->d_name.len, | |
2031 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2032 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
2033 | if (IS_ERR(inode)) { | |
2034 | err = PTR_ERR(inode); | |
2035 | goto out_fail; | |
2036 | } | |
5f39d397 | 2037 | |
39279cc3 CM |
2038 | drop_on_err = 1; |
2039 | inode->i_op = &btrfs_dir_inode_operations; | |
2040 | inode->i_fop = &btrfs_dir_file_operations; | |
2041 | btrfs_set_trans_block_group(trans, inode); | |
2042 | ||
3954401f | 2043 | inode->i_size = 0; |
39279cc3 CM |
2044 | err = btrfs_update_inode(trans, root, inode); |
2045 | if (err) | |
2046 | goto out_fail; | |
5f39d397 | 2047 | |
9c58309d | 2048 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
2049 | if (err) |
2050 | goto out_fail; | |
5f39d397 | 2051 | |
39279cc3 CM |
2052 | d_instantiate(dentry, inode); |
2053 | drop_on_err = 0; | |
2054 | dir->i_sb->s_dirt = 1; | |
2055 | btrfs_update_inode_block_group(trans, inode); | |
2056 | btrfs_update_inode_block_group(trans, dir); | |
2057 | ||
2058 | out_fail: | |
d3c2fdcf | 2059 | nr = trans->blocks_used; |
39279cc3 | 2060 | btrfs_end_transaction(trans, root); |
5f39d397 | 2061 | |
39279cc3 | 2062 | out_unlock: |
39279cc3 CM |
2063 | if (drop_on_err) |
2064 | iput(inode); | |
d3c2fdcf | 2065 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2066 | btrfs_throttle(root); |
39279cc3 CM |
2067 | return err; |
2068 | } | |
2069 | ||
3b951516 CM |
2070 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2071 | struct extent_map *existing, | |
2072 | struct extent_map *em) | |
2073 | { | |
2074 | u64 start_diff; | |
2075 | u64 new_end; | |
2076 | int ret = 0; | |
2077 | int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE; | |
2078 | ||
2079 | if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE) | |
2080 | goto invalid; | |
2081 | ||
2082 | if (!real_blocks && em->block_start != existing->block_start) | |
2083 | goto invalid; | |
2084 | ||
2085 | new_end = max(existing->start + existing->len, em->start + em->len); | |
2086 | ||
2087 | if (existing->start >= em->start) { | |
2088 | if (em->start + em->len < existing->start) | |
2089 | goto invalid; | |
2090 | ||
2091 | start_diff = existing->start - em->start; | |
2092 | if (real_blocks && em->block_start + start_diff != | |
2093 | existing->block_start) | |
2094 | goto invalid; | |
2095 | ||
2096 | em->len = new_end - em->start; | |
2097 | ||
2098 | remove_extent_mapping(em_tree, existing); | |
2099 | /* free for the tree */ | |
2100 | free_extent_map(existing); | |
2101 | ret = add_extent_mapping(em_tree, em); | |
2102 | ||
2103 | } else if (em->start > existing->start) { | |
2104 | ||
2105 | if (existing->start + existing->len < em->start) | |
2106 | goto invalid; | |
2107 | ||
2108 | start_diff = em->start - existing->start; | |
2109 | if (real_blocks && existing->block_start + start_diff != | |
2110 | em->block_start) | |
2111 | goto invalid; | |
2112 | ||
2113 | remove_extent_mapping(em_tree, existing); | |
2114 | em->block_start = existing->block_start; | |
2115 | em->start = existing->start; | |
2116 | em->len = new_end - existing->start; | |
2117 | free_extent_map(existing); | |
2118 | ||
2119 | ret = add_extent_mapping(em_tree, em); | |
2120 | } else { | |
2121 | goto invalid; | |
2122 | } | |
2123 | return ret; | |
2124 | ||
2125 | invalid: | |
2126 | printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n", | |
2127 | existing->start, existing->len, existing->block_start, | |
2128 | em->start, em->len, em->block_start); | |
2129 | return -EIO; | |
2130 | } | |
2131 | ||
a52d9a80 | 2132 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2133 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2134 | int create) |
2135 | { | |
2136 | int ret; | |
2137 | int err = 0; | |
db94535d | 2138 | u64 bytenr; |
a52d9a80 CM |
2139 | u64 extent_start = 0; |
2140 | u64 extent_end = 0; | |
2141 | u64 objectid = inode->i_ino; | |
2142 | u32 found_type; | |
a52d9a80 CM |
2143 | struct btrfs_path *path; |
2144 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2145 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2146 | struct extent_buffer *leaf; |
2147 | struct btrfs_key found_key; | |
a52d9a80 CM |
2148 | struct extent_map *em = NULL; |
2149 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2150 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2151 | struct btrfs_trans_handle *trans = NULL; |
2152 | ||
2153 | path = btrfs_alloc_path(); | |
2154 | BUG_ON(!path); | |
a52d9a80 CM |
2155 | |
2156 | again: | |
d1310b2e CM |
2157 | spin_lock(&em_tree->lock); |
2158 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
2159 | if (em) |
2160 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
d1310b2e CM |
2161 | spin_unlock(&em_tree->lock); |
2162 | ||
a52d9a80 | 2163 | if (em) { |
e1c4b745 CM |
2164 | if (em->start > start || em->start + em->len <= start) |
2165 | free_extent_map(em); | |
2166 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
2167 | free_extent_map(em); |
2168 | else | |
2169 | goto out; | |
a52d9a80 | 2170 | } |
d1310b2e | 2171 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2172 | if (!em) { |
d1310b2e CM |
2173 | err = -ENOMEM; |
2174 | goto out; | |
a52d9a80 | 2175 | } |
d1310b2e CM |
2176 | |
2177 | em->start = EXTENT_MAP_HOLE; | |
2178 | em->len = (u64)-1; | |
a061fc8d | 2179 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
179e29e4 CM |
2180 | ret = btrfs_lookup_file_extent(trans, root, path, |
2181 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2182 | if (ret < 0) { |
2183 | err = ret; | |
2184 | goto out; | |
2185 | } | |
2186 | ||
2187 | if (ret != 0) { | |
2188 | if (path->slots[0] == 0) | |
2189 | goto not_found; | |
2190 | path->slots[0]--; | |
2191 | } | |
2192 | ||
5f39d397 CM |
2193 | leaf = path->nodes[0]; |
2194 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2195 | struct btrfs_file_extent_item); |
a52d9a80 | 2196 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2197 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2198 | found_type = btrfs_key_type(&found_key); | |
2199 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2200 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2201 | goto not_found; | |
2202 | } | |
2203 | ||
5f39d397 CM |
2204 | found_type = btrfs_file_extent_type(leaf, item); |
2205 | extent_start = found_key.offset; | |
a52d9a80 CM |
2206 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2207 | extent_end = extent_start + | |
db94535d | 2208 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2209 | err = 0; |
b888db2b | 2210 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2211 | em->start = start; |
2212 | if (start < extent_start) { | |
d1310b2e | 2213 | if (start + len <= extent_start) |
b888db2b | 2214 | goto not_found; |
d1310b2e | 2215 | em->len = extent_end - extent_start; |
a52d9a80 | 2216 | } else { |
d1310b2e | 2217 | em->len = len; |
a52d9a80 CM |
2218 | } |
2219 | goto not_found_em; | |
2220 | } | |
db94535d CM |
2221 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2222 | if (bytenr == 0) { | |
a52d9a80 | 2223 | em->start = extent_start; |
d1310b2e | 2224 | em->len = extent_end - extent_start; |
5f39d397 | 2225 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2226 | goto insert; |
2227 | } | |
db94535d CM |
2228 | bytenr += btrfs_file_extent_offset(leaf, item); |
2229 | em->block_start = bytenr; | |
a52d9a80 | 2230 | em->start = extent_start; |
d1310b2e | 2231 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2232 | goto insert; |
2233 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2234 | u64 page_start; |
5f39d397 | 2235 | unsigned long ptr; |
a52d9a80 | 2236 | char *map; |
3326d1b0 CM |
2237 | size_t size; |
2238 | size_t extent_offset; | |
2239 | size_t copy_size; | |
a52d9a80 | 2240 | |
5f39d397 CM |
2241 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2242 | path->slots[0])); | |
d1310b2e CM |
2243 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2244 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2245 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2246 | em->start = start; |
2247 | if (start < extent_start) { | |
d1310b2e | 2248 | if (start + len <= extent_start) |
b888db2b | 2249 | goto not_found; |
d1310b2e | 2250 | em->len = extent_end - extent_start; |
a52d9a80 | 2251 | } else { |
d1310b2e | 2252 | em->len = len; |
a52d9a80 CM |
2253 | } |
2254 | goto not_found_em; | |
2255 | } | |
689f9346 | 2256 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2257 | |
2258 | if (!page) { | |
2259 | em->start = extent_start; | |
d1310b2e | 2260 | em->len = size; |
689f9346 Y |
2261 | goto out; |
2262 | } | |
5f39d397 | 2263 | |
70dec807 CM |
2264 | page_start = page_offset(page) + pg_offset; |
2265 | extent_offset = page_start - extent_start; | |
2266 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2267 | size - extent_offset); |
3326d1b0 | 2268 | em->start = extent_start + extent_offset; |
70dec807 CM |
2269 | em->len = (copy_size + root->sectorsize - 1) & |
2270 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2271 | map = kmap(page); |
2272 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2273 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2274 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2275 | copy_size); |
2276 | flush_dcache_page(page); | |
2277 | } else if (create && PageUptodate(page)) { | |
2278 | if (!trans) { | |
2279 | kunmap(page); | |
2280 | free_extent_map(em); | |
2281 | em = NULL; | |
2282 | btrfs_release_path(root, path); | |
2283 | trans = btrfs_start_transaction(root, 1); | |
2284 | goto again; | |
2285 | } | |
70dec807 | 2286 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2287 | copy_size); |
2288 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2289 | } |
a52d9a80 | 2290 | kunmap(page); |
d1310b2e CM |
2291 | set_extent_uptodate(io_tree, em->start, |
2292 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2293 | goto insert; |
2294 | } else { | |
2295 | printk("unkknown found_type %d\n", found_type); | |
2296 | WARN_ON(1); | |
2297 | } | |
2298 | not_found: | |
2299 | em->start = start; | |
d1310b2e | 2300 | em->len = len; |
a52d9a80 | 2301 | not_found_em: |
5f39d397 | 2302 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2303 | insert: |
2304 | btrfs_release_path(root, path); | |
d1310b2e CM |
2305 | if (em->start > start || extent_map_end(em) <= start) { |
2306 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2307 | err = -EIO; |
2308 | goto out; | |
2309 | } | |
d1310b2e CM |
2310 | |
2311 | err = 0; | |
2312 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2313 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2314 | /* it is possible that someone inserted the extent into the tree |
2315 | * while we had the lock dropped. It is also possible that | |
2316 | * an overlapping map exists in the tree | |
2317 | */ | |
a52d9a80 | 2318 | if (ret == -EEXIST) { |
3b951516 CM |
2319 | struct extent_map *existing; |
2320 | existing = lookup_extent_mapping(em_tree, start, len); | |
e1c4b745 CM |
2321 | if (existing && (existing->start > start || |
2322 | existing->start + existing->len <= start)) { | |
2323 | free_extent_map(existing); | |
2324 | existing = NULL; | |
2325 | } | |
3b951516 CM |
2326 | if (!existing) { |
2327 | existing = lookup_extent_mapping(em_tree, em->start, | |
2328 | em->len); | |
2329 | if (existing) { | |
2330 | err = merge_extent_mapping(em_tree, existing, | |
2331 | em); | |
2332 | free_extent_map(existing); | |
2333 | if (err) { | |
2334 | free_extent_map(em); | |
2335 | em = NULL; | |
2336 | } | |
2337 | } else { | |
2338 | err = -EIO; | |
2339 | printk("failing to insert %Lu %Lu\n", | |
2340 | start, len); | |
2341 | free_extent_map(em); | |
2342 | em = NULL; | |
2343 | } | |
2344 | } else { | |
2345 | free_extent_map(em); | |
2346 | em = existing; | |
a52d9a80 | 2347 | } |
a52d9a80 | 2348 | } |
d1310b2e | 2349 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2350 | out: |
2351 | btrfs_free_path(path); | |
2352 | if (trans) { | |
2353 | ret = btrfs_end_transaction(trans, root); | |
2354 | if (!err) | |
2355 | err = ret; | |
2356 | } | |
a52d9a80 CM |
2357 | if (err) { |
2358 | free_extent_map(em); | |
2359 | WARN_ON(1); | |
2360 | return ERR_PTR(err); | |
2361 | } | |
2362 | return em; | |
2363 | } | |
2364 | ||
e1c4b745 | 2365 | #if 0 /* waiting for O_DIRECT reads */ |
16432985 CM |
2366 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2367 | struct buffer_head *bh_result, int create) | |
2368 | { | |
2369 | struct extent_map *em; | |
2370 | u64 start = (u64)iblock << inode->i_blkbits; | |
2371 | struct btrfs_multi_bio *multi = NULL; | |
2372 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2373 | u64 len; | |
2374 | u64 logical; | |
2375 | u64 map_length; | |
2376 | int ret = 0; | |
2377 | ||
2378 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2379 | ||
2380 | if (!em || IS_ERR(em)) | |
2381 | goto out; | |
2382 | ||
e1c4b745 | 2383 | if (em->start > start || em->start + em->len <= start) { |
16432985 | 2384 | goto out; |
e1c4b745 | 2385 | } |
16432985 CM |
2386 | |
2387 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2388 | ret = -EINVAL; | |
2389 | goto out; | |
2390 | } | |
2391 | ||
e1c4b745 CM |
2392 | len = em->start + em->len - start; |
2393 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2394 | ||
16432985 CM |
2395 | if (em->block_start == EXTENT_MAP_HOLE || |
2396 | em->block_start == EXTENT_MAP_DELALLOC) { | |
e1c4b745 | 2397 | bh_result->b_size = len; |
16432985 CM |
2398 | goto out; |
2399 | } | |
2400 | ||
16432985 CM |
2401 | logical = start - em->start; |
2402 | logical = em->block_start + logical; | |
2403 | ||
2404 | map_length = len; | |
2405 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2406 | logical, &map_length, &multi, 0); | |
2407 | BUG_ON(ret); | |
2408 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2409 | bh_result->b_size = min(map_length, len); | |
e1c4b745 | 2410 | |
16432985 CM |
2411 | bh_result->b_bdev = multi->stripes[0].dev->bdev; |
2412 | set_buffer_mapped(bh_result); | |
2413 | kfree(multi); | |
2414 | out: | |
2415 | free_extent_map(em); | |
2416 | return ret; | |
2417 | } | |
e1c4b745 | 2418 | #endif |
16432985 CM |
2419 | |
2420 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2421 | const struct iovec *iov, loff_t offset, | |
2422 | unsigned long nr_segs) | |
2423 | { | |
e1c4b745 CM |
2424 | return -EINVAL; |
2425 | #if 0 | |
16432985 CM |
2426 | struct file *file = iocb->ki_filp; |
2427 | struct inode *inode = file->f_mapping->host; | |
2428 | ||
2429 | if (rw == WRITE) | |
2430 | return -EINVAL; | |
2431 | ||
2432 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2433 | offset, nr_segs, btrfs_get_block, NULL); | |
e1c4b745 | 2434 | #endif |
16432985 CM |
2435 | } |
2436 | ||
d396c6f5 | 2437 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2438 | { |
d396c6f5 | 2439 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2440 | } |
2441 | ||
a52d9a80 | 2442 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2443 | { |
d1310b2e CM |
2444 | struct extent_io_tree *tree; |
2445 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2446 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2447 | } |
1832a6d5 | 2448 | |
a52d9a80 | 2449 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2450 | { |
d1310b2e | 2451 | struct extent_io_tree *tree; |
b888db2b CM |
2452 | |
2453 | ||
2454 | if (current->flags & PF_MEMALLOC) { | |
2455 | redirty_page_for_writepage(wbc, page); | |
2456 | unlock_page(page); | |
2457 | return 0; | |
2458 | } | |
d1310b2e | 2459 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2460 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2461 | } |
2462 | ||
b293f02e CM |
2463 | static int btrfs_writepages(struct address_space *mapping, |
2464 | struct writeback_control *wbc) | |
2465 | { | |
d1310b2e CM |
2466 | struct extent_io_tree *tree; |
2467 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2468 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2469 | } | |
2470 | ||
3ab2fb5a CM |
2471 | static int |
2472 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2473 | struct list_head *pages, unsigned nr_pages) | |
2474 | { | |
d1310b2e CM |
2475 | struct extent_io_tree *tree; |
2476 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2477 | return extent_readpages(tree, mapping, pages, nr_pages, |
2478 | btrfs_get_extent); | |
2479 | } | |
2480 | ||
70dec807 | 2481 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2482 | { |
d1310b2e CM |
2483 | struct extent_io_tree *tree; |
2484 | struct extent_map_tree *map; | |
a52d9a80 | 2485 | int ret; |
8c2383c3 | 2486 | |
d1310b2e CM |
2487 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2488 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2489 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 | 2490 | if (ret == 1) { |
4ef64eae | 2491 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
a52d9a80 CM |
2492 | ClearPagePrivate(page); |
2493 | set_page_private(page, 0); | |
2494 | page_cache_release(page); | |
39279cc3 | 2495 | } |
a52d9a80 | 2496 | return ret; |
39279cc3 CM |
2497 | } |
2498 | ||
a52d9a80 | 2499 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2500 | { |
d1310b2e | 2501 | struct extent_io_tree *tree; |
39279cc3 | 2502 | |
d1310b2e | 2503 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2504 | extent_invalidatepage(tree, page, offset); |
2505 | btrfs_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 2506 | if (PagePrivate(page)) { |
4ef64eae | 2507 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
9ad6b7bc CM |
2508 | ClearPagePrivate(page); |
2509 | set_page_private(page, 0); | |
2510 | page_cache_release(page); | |
2511 | } | |
39279cc3 CM |
2512 | } |
2513 | ||
9ebefb18 CM |
2514 | /* |
2515 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2516 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2517 | * be careful to check for EOF conditions here. We set the page up correctly | |
2518 | * for a written page which means we get ENOSPC checking when writing into | |
2519 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2520 | * support these features. | |
2521 | * | |
2522 | * We are not allowed to take the i_mutex here so we have to play games to | |
2523 | * protect against truncate races as the page could now be beyond EOF. Because | |
2524 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2525 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2526 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2527 | * unlock the page. | |
2528 | */ | |
2529 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2530 | { | |
6da6abae | 2531 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2532 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2533 | unsigned long end; |
2534 | loff_t size; | |
1832a6d5 | 2535 | int ret; |
a52d9a80 | 2536 | u64 page_start; |
9ebefb18 | 2537 | |
1832a6d5 | 2538 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); |
1832a6d5 CM |
2539 | if (ret) |
2540 | goto out; | |
2541 | ||
2542 | ret = -EINVAL; | |
2543 | ||
9ebefb18 CM |
2544 | lock_page(page); |
2545 | wait_on_page_writeback(page); | |
9ebefb18 | 2546 | size = i_size_read(inode); |
35ebb934 | 2547 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2548 | |
9ebefb18 | 2549 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2550 | (page_start > size)) { |
9ebefb18 CM |
2551 | /* page got truncated out from underneath us */ |
2552 | goto out_unlock; | |
2553 | } | |
2554 | ||
2555 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2556 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2557 | end = size & ~PAGE_CACHE_MASK; |
2558 | else | |
2559 | end = PAGE_CACHE_SIZE; | |
2560 | ||
b888db2b | 2561 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2562 | |
2563 | out_unlock: | |
2564 | unlock_page(page); | |
1832a6d5 | 2565 | out: |
9ebefb18 CM |
2566 | return ret; |
2567 | } | |
2568 | ||
39279cc3 CM |
2569 | static void btrfs_truncate(struct inode *inode) |
2570 | { | |
2571 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2572 | int ret; | |
2573 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2574 | unsigned long nr; |
39279cc3 CM |
2575 | |
2576 | if (!S_ISREG(inode->i_mode)) | |
2577 | return; | |
2578 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2579 | return; | |
2580 | ||
2581 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2582 | ||
39279cc3 CM |
2583 | trans = btrfs_start_transaction(root, 1); |
2584 | btrfs_set_trans_block_group(trans, inode); | |
2585 | ||
2586 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2587 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2588 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2589 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2590 | nr = trans->blocks_used; |
5f39d397 | 2591 | |
39279cc3 CM |
2592 | ret = btrfs_end_transaction(trans, root); |
2593 | BUG_ON(ret); | |
d3c2fdcf | 2594 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2595 | btrfs_throttle(root); |
39279cc3 CM |
2596 | } |
2597 | ||
3b96362c SW |
2598 | /* |
2599 | * Invalidate a single dcache entry at the root of the filesystem. | |
2600 | * Needed after creation of snapshot or subvolume. | |
2601 | */ | |
2602 | void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name, | |
2603 | int namelen) | |
2604 | { | |
2605 | struct dentry *alias, *entry; | |
2606 | struct qstr qstr; | |
2607 | ||
2608 | alias = d_find_alias(root->fs_info->sb->s_root->d_inode); | |
2609 | if (alias) { | |
2610 | qstr.name = name; | |
2611 | qstr.len = namelen; | |
2612 | /* change me if btrfs ever gets a d_hash operation */ | |
2613 | qstr.hash = full_name_hash(qstr.name, qstr.len); | |
2614 | entry = d_lookup(alias, &qstr); | |
2615 | dput(alias); | |
2616 | if (entry) { | |
2617 | d_invalidate(entry); | |
2618 | dput(entry); | |
2619 | } | |
2620 | } | |
2621 | } | |
2622 | ||
f46b5a66 CH |
2623 | int btrfs_create_subvol_root(struct btrfs_root *new_root, |
2624 | struct btrfs_trans_handle *trans, u64 new_dirid, | |
2625 | struct btrfs_block_group_cache *block_group) | |
39279cc3 | 2626 | { |
39279cc3 | 2627 | struct inode *inode; |
39279cc3 | 2628 | int ret; |
39279cc3 | 2629 | |
9c58309d | 2630 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
f46b5a66 | 2631 | new_dirid, block_group, S_IFDIR | 0700); |
54aa1f4d | 2632 | if (IS_ERR(inode)) |
f46b5a66 | 2633 | return PTR_ERR(inode); |
39279cc3 CM |
2634 | inode->i_op = &btrfs_dir_inode_operations; |
2635 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2636 | new_root->inode = inode; |
39279cc3 | 2637 | |
3954401f CM |
2638 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2639 | new_dirid); | |
39279cc3 | 2640 | inode->i_nlink = 1; |
3954401f | 2641 | inode->i_size = 0; |
3b96362c | 2642 | |
f46b5a66 | 2643 | return btrfs_update_inode(trans, new_root, inode); |
39279cc3 CM |
2644 | } |
2645 | ||
edbd8d4e | 2646 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2647 | struct file_ra_state *ra, struct file *file, |
2648 | pgoff_t offset, pgoff_t last_index) | |
2649 | { | |
8e7bf94f | 2650 | pgoff_t req_size = last_index - offset + 1; |
86479a04 CM |
2651 | |
2652 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
86479a04 CM |
2653 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); |
2654 | return offset; | |
2655 | #else | |
86479a04 CM |
2656 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
2657 | return offset + req_size; | |
2658 | #endif | |
2659 | } | |
2660 | ||
39279cc3 CM |
2661 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
2662 | { | |
2663 | struct btrfs_inode *ei; | |
2664 | ||
2665 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2666 | if (!ei) | |
2667 | return NULL; | |
15ee9bc7 | 2668 | ei->last_trans = 0; |
dc17ff8f | 2669 | ei->ordered_trans = 0; |
39279cc3 CM |
2670 | return &ei->vfs_inode; |
2671 | } | |
2672 | ||
2673 | void btrfs_destroy_inode(struct inode *inode) | |
2674 | { | |
2675 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2676 | WARN_ON(inode->i_data.nrpages); | |
2677 | ||
8c416c9e | 2678 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2679 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2680 | } | |
2681 | ||
44ec0b71 CM |
2682 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2683 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2684 | #else | |
39279cc3 CM |
2685 | static void init_once(void * foo, struct kmem_cache * cachep, |
2686 | unsigned long flags) | |
44ec0b71 | 2687 | #endif |
39279cc3 CM |
2688 | { |
2689 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2690 | ||
2691 | inode_init_once(&ei->vfs_inode); | |
2692 | } | |
2693 | ||
2694 | void btrfs_destroy_cachep(void) | |
2695 | { | |
2696 | if (btrfs_inode_cachep) | |
2697 | kmem_cache_destroy(btrfs_inode_cachep); | |
2698 | if (btrfs_trans_handle_cachep) | |
2699 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2700 | if (btrfs_transaction_cachep) | |
2701 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2702 | if (btrfs_bit_radix_cachep) | |
2703 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2704 | if (btrfs_path_cachep) | |
2705 | kmem_cache_destroy(btrfs_path_cachep); | |
2706 | } | |
2707 | ||
86479a04 | 2708 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2709 | unsigned long extra_flags, |
44ec0b71 CM |
2710 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2711 | void (*ctor)(struct kmem_cache *, void *) | |
2712 | #else | |
92fee66d | 2713 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2714 | unsigned long) |
2715 | #endif | |
2716 | ) | |
92fee66d CM |
2717 | { |
2718 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2719 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2720 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2721 | ,NULL | |
2722 | #endif | |
2723 | ); | |
2724 | } | |
2725 | ||
39279cc3 CM |
2726 | int btrfs_init_cachep(void) |
2727 | { | |
86479a04 | 2728 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2729 | sizeof(struct btrfs_inode), |
2730 | 0, init_once); | |
39279cc3 CM |
2731 | if (!btrfs_inode_cachep) |
2732 | goto fail; | |
86479a04 CM |
2733 | btrfs_trans_handle_cachep = |
2734 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2735 | sizeof(struct btrfs_trans_handle), | |
2736 | 0, NULL); | |
39279cc3 CM |
2737 | if (!btrfs_trans_handle_cachep) |
2738 | goto fail; | |
86479a04 | 2739 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2740 | sizeof(struct btrfs_transaction), |
92fee66d | 2741 | 0, NULL); |
39279cc3 CM |
2742 | if (!btrfs_transaction_cachep) |
2743 | goto fail; | |
86479a04 | 2744 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2745 | sizeof(struct btrfs_path), |
92fee66d | 2746 | 0, NULL); |
39279cc3 CM |
2747 | if (!btrfs_path_cachep) |
2748 | goto fail; | |
86479a04 | 2749 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2750 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2751 | if (!btrfs_bit_radix_cachep) |
2752 | goto fail; | |
2753 | return 0; | |
2754 | fail: | |
2755 | btrfs_destroy_cachep(); | |
2756 | return -ENOMEM; | |
2757 | } | |
2758 | ||
2759 | static int btrfs_getattr(struct vfsmount *mnt, | |
2760 | struct dentry *dentry, struct kstat *stat) | |
2761 | { | |
2762 | struct inode *inode = dentry->d_inode; | |
2763 | generic_fillattr(inode, stat); | |
d6667462 | 2764 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 2765 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
2766 | return 0; |
2767 | } | |
2768 | ||
2769 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2770 | struct inode * new_dir,struct dentry *new_dentry) | |
2771 | { | |
2772 | struct btrfs_trans_handle *trans; | |
2773 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2774 | struct inode *new_inode = new_dentry->d_inode; | |
2775 | struct inode *old_inode = old_dentry->d_inode; | |
2776 | struct timespec ctime = CURRENT_TIME; | |
39279cc3 CM |
2777 | int ret; |
2778 | ||
2779 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2780 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2781 | return -ENOTEMPTY; | |
2782 | } | |
5f39d397 | 2783 | |
1832a6d5 CM |
2784 | ret = btrfs_check_free_space(root, 1, 0); |
2785 | if (ret) | |
2786 | goto out_unlock; | |
2787 | ||
39279cc3 | 2788 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2789 | |
39279cc3 | 2790 | btrfs_set_trans_block_group(trans, new_dir); |
39279cc3 CM |
2791 | |
2792 | old_dentry->d_inode->i_nlink++; | |
2793 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2794 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2795 | old_inode->i_ctime = ctime; | |
5f39d397 | 2796 | |
39279cc3 CM |
2797 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2798 | if (ret) | |
2799 | goto out_fail; | |
2800 | ||
2801 | if (new_inode) { | |
2802 | new_inode->i_ctime = CURRENT_TIME; | |
2803 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2804 | if (ret) | |
2805 | goto out_fail; | |
39279cc3 | 2806 | } |
9c58309d | 2807 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
2808 | if (ret) |
2809 | goto out_fail; | |
2810 | ||
2811 | out_fail: | |
39279cc3 | 2812 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2813 | out_unlock: |
39279cc3 CM |
2814 | return ret; |
2815 | } | |
2816 | ||
2817 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2818 | const char *symname) | |
2819 | { | |
2820 | struct btrfs_trans_handle *trans; | |
2821 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2822 | struct btrfs_path *path; | |
2823 | struct btrfs_key key; | |
1832a6d5 | 2824 | struct inode *inode = NULL; |
39279cc3 CM |
2825 | int err; |
2826 | int drop_inode = 0; | |
2827 | u64 objectid; | |
2828 | int name_len; | |
2829 | int datasize; | |
5f39d397 | 2830 | unsigned long ptr; |
39279cc3 | 2831 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2832 | struct extent_buffer *leaf; |
1832a6d5 | 2833 | unsigned long nr = 0; |
39279cc3 CM |
2834 | |
2835 | name_len = strlen(symname) + 1; | |
2836 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2837 | return -ENAMETOOLONG; | |
1832a6d5 | 2838 | |
1832a6d5 CM |
2839 | err = btrfs_check_free_space(root, 1, 0); |
2840 | if (err) | |
2841 | goto out_fail; | |
2842 | ||
39279cc3 CM |
2843 | trans = btrfs_start_transaction(root, 1); |
2844 | btrfs_set_trans_block_group(trans, dir); | |
2845 | ||
2846 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2847 | if (err) { | |
2848 | err = -ENOSPC; | |
2849 | goto out_unlock; | |
2850 | } | |
2851 | ||
9c58309d CM |
2852 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2853 | dentry->d_name.len, | |
2854 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2855 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
2856 | err = PTR_ERR(inode); | |
2857 | if (IS_ERR(inode)) | |
2858 | goto out_unlock; | |
2859 | ||
2860 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 2861 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
2862 | if (err) |
2863 | drop_inode = 1; | |
2864 | else { | |
2865 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2866 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
2867 | inode->i_fop = &btrfs_file_operations; |
2868 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2869 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2870 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2871 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
2872 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
2873 | inode->i_mapping, GFP_NOFS); | |
9069218d | 2874 | BTRFS_I(inode)->delalloc_bytes = 0; |
81d7ed29 | 2875 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
d1310b2e | 2876 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2877 | } |
2878 | dir->i_sb->s_dirt = 1; | |
2879 | btrfs_update_inode_block_group(trans, inode); | |
2880 | btrfs_update_inode_block_group(trans, dir); | |
2881 | if (drop_inode) | |
2882 | goto out_unlock; | |
2883 | ||
2884 | path = btrfs_alloc_path(); | |
2885 | BUG_ON(!path); | |
2886 | key.objectid = inode->i_ino; | |
2887 | key.offset = 0; | |
39279cc3 CM |
2888 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2889 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2890 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2891 | datasize); | |
54aa1f4d CM |
2892 | if (err) { |
2893 | drop_inode = 1; | |
2894 | goto out_unlock; | |
2895 | } | |
5f39d397 CM |
2896 | leaf = path->nodes[0]; |
2897 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2898 | struct btrfs_file_extent_item); | |
2899 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2900 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2901 | BTRFS_FILE_EXTENT_INLINE); |
2902 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2903 | write_extent_buffer(leaf, symname, ptr, name_len); |
2904 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2905 | btrfs_free_path(path); |
5f39d397 | 2906 | |
39279cc3 CM |
2907 | inode->i_op = &btrfs_symlink_inode_operations; |
2908 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 2909 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 2910 | inode->i_size = name_len - 1; |
54aa1f4d CM |
2911 | err = btrfs_update_inode(trans, root, inode); |
2912 | if (err) | |
2913 | drop_inode = 1; | |
39279cc3 CM |
2914 | |
2915 | out_unlock: | |
d3c2fdcf | 2916 | nr = trans->blocks_used; |
39279cc3 | 2917 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2918 | out_fail: |
39279cc3 CM |
2919 | if (drop_inode) { |
2920 | inode_dec_link_count(inode); | |
2921 | iput(inode); | |
2922 | } | |
d3c2fdcf | 2923 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2924 | btrfs_throttle(root); |
39279cc3 CM |
2925 | return err; |
2926 | } | |
16432985 | 2927 | |
fdebe2bd Y |
2928 | static int btrfs_permission(struct inode *inode, int mask, |
2929 | struct nameidata *nd) | |
2930 | { | |
2931 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
2932 | return -EACCES; | |
2933 | return generic_permission(inode, mask, NULL); | |
2934 | } | |
39279cc3 CM |
2935 | |
2936 | static struct inode_operations btrfs_dir_inode_operations = { | |
2937 | .lookup = btrfs_lookup, | |
2938 | .create = btrfs_create, | |
2939 | .unlink = btrfs_unlink, | |
2940 | .link = btrfs_link, | |
2941 | .mkdir = btrfs_mkdir, | |
2942 | .rmdir = btrfs_rmdir, | |
2943 | .rename = btrfs_rename, | |
2944 | .symlink = btrfs_symlink, | |
2945 | .setattr = btrfs_setattr, | |
618e21d5 | 2946 | .mknod = btrfs_mknod, |
5103e947 JB |
2947 | .setxattr = generic_setxattr, |
2948 | .getxattr = generic_getxattr, | |
2949 | .listxattr = btrfs_listxattr, | |
2950 | .removexattr = generic_removexattr, | |
fdebe2bd | 2951 | .permission = btrfs_permission, |
39279cc3 | 2952 | }; |
39279cc3 CM |
2953 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2954 | .lookup = btrfs_lookup, | |
fdebe2bd | 2955 | .permission = btrfs_permission, |
39279cc3 | 2956 | }; |
39279cc3 CM |
2957 | static struct file_operations btrfs_dir_file_operations = { |
2958 | .llseek = generic_file_llseek, | |
2959 | .read = generic_read_dir, | |
2960 | .readdir = btrfs_readdir, | |
34287aa3 | 2961 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2962 | #ifdef CONFIG_COMPAT |
34287aa3 | 2963 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 2964 | #endif |
6bf13c0c | 2965 | .release = btrfs_release_file, |
39279cc3 CM |
2966 | }; |
2967 | ||
d1310b2e | 2968 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 2969 | .fill_delalloc = run_delalloc_range, |
065631f6 | 2970 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 2971 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac CM |
2972 | .readpage_io_hook = btrfs_readpage_io_hook, |
2973 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
1259ab75 | 2974 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
2975 | .set_bit_hook = btrfs_set_bit_hook, |
2976 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
2977 | }; |
2978 | ||
39279cc3 CM |
2979 | static struct address_space_operations btrfs_aops = { |
2980 | .readpage = btrfs_readpage, | |
2981 | .writepage = btrfs_writepage, | |
b293f02e | 2982 | .writepages = btrfs_writepages, |
3ab2fb5a | 2983 | .readpages = btrfs_readpages, |
39279cc3 | 2984 | .sync_page = block_sync_page, |
39279cc3 | 2985 | .bmap = btrfs_bmap, |
16432985 | 2986 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
2987 | .invalidatepage = btrfs_invalidatepage, |
2988 | .releasepage = btrfs_releasepage, | |
2989 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2990 | }; |
2991 | ||
2992 | static struct address_space_operations btrfs_symlink_aops = { | |
2993 | .readpage = btrfs_readpage, | |
2994 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2995 | .invalidatepage = btrfs_invalidatepage, |
2996 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2997 | }; |
2998 | ||
2999 | static struct inode_operations btrfs_file_inode_operations = { | |
3000 | .truncate = btrfs_truncate, | |
3001 | .getattr = btrfs_getattr, | |
3002 | .setattr = btrfs_setattr, | |
5103e947 JB |
3003 | .setxattr = generic_setxattr, |
3004 | .getxattr = generic_getxattr, | |
3005 | .listxattr = btrfs_listxattr, | |
3006 | .removexattr = generic_removexattr, | |
fdebe2bd | 3007 | .permission = btrfs_permission, |
39279cc3 | 3008 | }; |
618e21d5 JB |
3009 | static struct inode_operations btrfs_special_inode_operations = { |
3010 | .getattr = btrfs_getattr, | |
3011 | .setattr = btrfs_setattr, | |
fdebe2bd | 3012 | .permission = btrfs_permission, |
618e21d5 | 3013 | }; |
39279cc3 CM |
3014 | static struct inode_operations btrfs_symlink_inode_operations = { |
3015 | .readlink = generic_readlink, | |
3016 | .follow_link = page_follow_link_light, | |
3017 | .put_link = page_put_link, | |
fdebe2bd | 3018 | .permission = btrfs_permission, |
39279cc3 | 3019 | }; |