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 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
39279cc3 CM |
35 | #include "ctree.h" |
36 | #include "disk-io.h" | |
37 | #include "transaction.h" | |
38 | #include "btrfs_inode.h" | |
39 | #include "ioctl.h" | |
40 | #include "print-tree.h" | |
41 | ||
42 | struct btrfs_iget_args { | |
43 | u64 ino; | |
44 | struct btrfs_root *root; | |
45 | }; | |
46 | ||
47 | static struct inode_operations btrfs_dir_inode_operations; | |
48 | static struct inode_operations btrfs_symlink_inode_operations; | |
49 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 50 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
51 | static struct inode_operations btrfs_file_inode_operations; |
52 | static struct address_space_operations btrfs_aops; | |
53 | static struct address_space_operations btrfs_symlink_aops; | |
54 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 55 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
56 | |
57 | static struct kmem_cache *btrfs_inode_cachep; | |
58 | struct kmem_cache *btrfs_trans_handle_cachep; | |
59 | struct kmem_cache *btrfs_transaction_cachep; | |
60 | struct kmem_cache *btrfs_bit_radix_cachep; | |
61 | struct kmem_cache *btrfs_path_cachep; | |
62 | ||
63 | #define S_SHIFT 12 | |
64 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
65 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
66 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
67 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
68 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
69 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
70 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
71 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
72 | }; | |
73 | ||
b888db2b CM |
74 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) |
75 | { | |
76 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
77 | struct btrfs_trans_handle *trans; | |
78 | struct btrfs_key ins; | |
79 | u64 alloc_hint = 0; | |
80 | u64 num_blocks; | |
81 | int ret; | |
82 | u64 blocksize = 1 << inode->i_blkbits; | |
83 | ||
84 | mutex_lock(&root->fs_info->fs_mutex); | |
85 | trans = btrfs_start_transaction(root, 1); | |
86 | btrfs_set_trans_block_group(trans, inode); | |
87 | BUG_ON(!trans); | |
88 | num_blocks = (end - start + blocksize) & ~(blocksize - 1); | |
89 | ret = btrfs_drop_extents(trans, root, inode, | |
90 | start, start + num_blocks, &alloc_hint); | |
91 | num_blocks = num_blocks >> inode->i_blkbits; | |
92 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0, | |
93 | alloc_hint, (u64)-1, &ins, 1); | |
94 | if (ret) { | |
95 | WARN_ON(1); | |
96 | goto out; | |
97 | } | |
98 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
99 | start, ins.objectid, ins.offset, | |
100 | ins.offset); | |
101 | out: | |
102 | btrfs_end_transaction(trans, root); | |
103 | mutex_unlock(&root->fs_info->fs_mutex); | |
104 | return ret; | |
105 | } | |
106 | ||
07157aac CM |
107 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
108 | { | |
109 | struct inode *inode = page->mapping->host; | |
110 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
111 | struct btrfs_trans_handle *trans; | |
112 | char *kaddr; | |
113 | int ret; | |
114 | u64 page_start = page->index << PAGE_CACHE_SHIFT; | |
115 | size_t offset = start - page_start; | |
116 | ||
117 | mutex_lock(&root->fs_info->fs_mutex); | |
118 | trans = btrfs_start_transaction(root, 1); | |
119 | btrfs_set_trans_block_group(trans, inode); | |
120 | kaddr = kmap(page); | |
121 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
122 | start, kaddr + offset, end - start + 1); | |
123 | kunmap(page); | |
124 | ret = btrfs_end_transaction(trans, root); | |
125 | BUG_ON(ret); | |
126 | mutex_unlock(&root->fs_info->fs_mutex); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
131 | { | |
132 | int ret = 0; | |
133 | struct inode *inode = page->mapping->host; | |
134 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
135 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
136 | struct btrfs_csum_item *item; | |
137 | struct btrfs_path *path = NULL; | |
138 | u64 private; | |
139 | ||
140 | mutex_lock(&root->fs_info->fs_mutex); | |
141 | path = btrfs_alloc_path(); | |
142 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
143 | if (IS_ERR(item)) { | |
144 | ret = PTR_ERR(item); | |
145 | /* a csum that isn't present is a preallocated region. */ | |
146 | if (ret == -ENOENT || ret == -EFBIG) | |
147 | ret = 0; | |
148 | private = 0; | |
149 | goto out; | |
150 | } | |
151 | memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE); | |
152 | set_state_private(em_tree, start, private); | |
153 | out: | |
154 | if (path) | |
155 | btrfs_free_path(path); | |
156 | mutex_unlock(&root->fs_info->fs_mutex); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
161 | { | |
162 | char csum[BTRFS_CRC32_SIZE]; | |
163 | size_t offset = start - (page->index << PAGE_CACHE_SHIFT); | |
164 | struct inode *inode = page->mapping->host; | |
165 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
166 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
167 | char *kaddr; | |
168 | u64 private; | |
169 | int ret; | |
170 | ||
171 | ret = get_state_private(em_tree, start, &private); | |
172 | kaddr = kmap_atomic(page, KM_IRQ0); | |
173 | if (ret) { | |
174 | goto zeroit; | |
175 | } | |
176 | ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum); | |
177 | BUG_ON(ret); | |
178 | if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) { | |
179 | goto zeroit; | |
180 | } | |
181 | kunmap_atomic(kaddr, KM_IRQ0); | |
182 | return 0; | |
183 | ||
184 | zeroit: | |
185 | printk("btrfs csum failed ino %lu off %llu\n", | |
186 | page->mapping->host->i_ino, (unsigned long long)start); | |
187 | memset(kaddr + offset, 1, end - start + 1); flush_dcache_page(page); | |
188 | kunmap_atomic(kaddr, KM_IRQ0); | |
189 | return 0; | |
190 | } | |
b888db2b | 191 | |
39279cc3 CM |
192 | void btrfs_read_locked_inode(struct inode *inode) |
193 | { | |
194 | struct btrfs_path *path; | |
195 | struct btrfs_inode_item *inode_item; | |
196 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
197 | struct btrfs_key location; | |
198 | u64 alloc_group_block; | |
618e21d5 | 199 | u32 rdev; |
39279cc3 CM |
200 | int ret; |
201 | ||
202 | path = btrfs_alloc_path(); | |
203 | BUG_ON(!path); | |
39279cc3 CM |
204 | mutex_lock(&root->fs_info->fs_mutex); |
205 | ||
206 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
207 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
208 | if (ret) { | |
39279cc3 CM |
209 | goto make_bad; |
210 | } | |
211 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
212 | path->slots[0], | |
213 | struct btrfs_inode_item); | |
214 | ||
215 | inode->i_mode = btrfs_inode_mode(inode_item); | |
216 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
217 | inode->i_uid = btrfs_inode_uid(inode_item); | |
218 | inode->i_gid = btrfs_inode_gid(inode_item); | |
219 | inode->i_size = btrfs_inode_size(inode_item); | |
220 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
221 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
222 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
223 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
224 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
225 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
226 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
227 | inode->i_generation = btrfs_inode_generation(inode_item); | |
618e21d5 JB |
228 | inode->i_rdev = 0; |
229 | rdev = btrfs_inode_rdev(inode_item); | |
39279cc3 CM |
230 | alloc_group_block = btrfs_inode_block_group(inode_item); |
231 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, | |
232 | alloc_group_block); | |
233 | ||
234 | btrfs_free_path(path); | |
235 | inode_item = NULL; | |
236 | ||
237 | mutex_unlock(&root->fs_info->fs_mutex); | |
238 | ||
239 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
240 | case S_IFREG: |
241 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 242 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
243 | inode->i_fop = &btrfs_file_operations; |
244 | inode->i_op = &btrfs_file_inode_operations; | |
245 | break; | |
246 | case S_IFDIR: | |
247 | inode->i_fop = &btrfs_dir_file_operations; | |
248 | if (root == root->fs_info->tree_root) | |
249 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
250 | else | |
251 | inode->i_op = &btrfs_dir_inode_operations; | |
252 | break; | |
253 | case S_IFLNK: | |
254 | inode->i_op = &btrfs_symlink_inode_operations; | |
255 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
256 | break; | |
618e21d5 JB |
257 | default: |
258 | init_special_inode(inode, inode->i_mode, rdev); | |
259 | break; | |
39279cc3 CM |
260 | } |
261 | return; | |
262 | ||
263 | make_bad: | |
264 | btrfs_release_path(root, path); | |
265 | btrfs_free_path(path); | |
266 | mutex_unlock(&root->fs_info->fs_mutex); | |
267 | make_bad_inode(inode); | |
268 | } | |
269 | ||
270 | static void fill_inode_item(struct btrfs_inode_item *item, | |
271 | struct inode *inode) | |
272 | { | |
273 | btrfs_set_inode_uid(item, inode->i_uid); | |
274 | btrfs_set_inode_gid(item, inode->i_gid); | |
275 | btrfs_set_inode_size(item, inode->i_size); | |
276 | btrfs_set_inode_mode(item, inode->i_mode); | |
277 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
278 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
279 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
280 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
281 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
282 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
283 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
284 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
285 | btrfs_set_inode_generation(item, inode->i_generation); | |
618e21d5 | 286 | btrfs_set_inode_rdev(item, inode->i_rdev); |
39279cc3 CM |
287 | btrfs_set_inode_block_group(item, |
288 | BTRFS_I(inode)->block_group->key.objectid); | |
289 | } | |
290 | ||
a52d9a80 | 291 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
292 | struct btrfs_root *root, |
293 | struct inode *inode) | |
294 | { | |
295 | struct btrfs_inode_item *inode_item; | |
296 | struct btrfs_path *path; | |
297 | int ret; | |
298 | ||
299 | path = btrfs_alloc_path(); | |
300 | BUG_ON(!path); | |
39279cc3 CM |
301 | ret = btrfs_lookup_inode(trans, root, path, |
302 | &BTRFS_I(inode)->location, 1); | |
303 | if (ret) { | |
304 | if (ret > 0) | |
305 | ret = -ENOENT; | |
306 | goto failed; | |
307 | } | |
308 | ||
309 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
310 | path->slots[0], | |
311 | struct btrfs_inode_item); | |
312 | ||
313 | fill_inode_item(inode_item, inode); | |
314 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
15ee9bc7 | 315 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
316 | ret = 0; |
317 | failed: | |
318 | btrfs_release_path(root, path); | |
319 | btrfs_free_path(path); | |
320 | return ret; | |
321 | } | |
322 | ||
323 | ||
324 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
325 | struct btrfs_root *root, | |
326 | struct inode *dir, | |
327 | struct dentry *dentry) | |
328 | { | |
329 | struct btrfs_path *path; | |
330 | const char *name = dentry->d_name.name; | |
331 | int name_len = dentry->d_name.len; | |
332 | int ret = 0; | |
333 | u64 objectid; | |
334 | struct btrfs_dir_item *di; | |
335 | ||
336 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
337 | if (!path) { |
338 | ret = -ENOMEM; | |
339 | goto err; | |
340 | } | |
341 | ||
39279cc3 CM |
342 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
343 | name, name_len, -1); | |
344 | if (IS_ERR(di)) { | |
345 | ret = PTR_ERR(di); | |
346 | goto err; | |
347 | } | |
348 | if (!di) { | |
349 | ret = -ENOENT; | |
350 | goto err; | |
351 | } | |
352 | objectid = btrfs_disk_key_objectid(&di->location); | |
353 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
54aa1f4d CM |
354 | if (ret) |
355 | goto err; | |
39279cc3 CM |
356 | btrfs_release_path(root, path); |
357 | ||
358 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
359 | objectid, name, name_len, -1); | |
360 | if (IS_ERR(di)) { | |
361 | ret = PTR_ERR(di); | |
362 | goto err; | |
363 | } | |
364 | if (!di) { | |
365 | ret = -ENOENT; | |
366 | goto err; | |
367 | } | |
368 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
369 | |
370 | dentry->d_inode->i_ctime = dir->i_ctime; | |
371 | err: | |
372 | btrfs_free_path(path); | |
373 | if (!ret) { | |
374 | dir->i_size -= name_len * 2; | |
79c44584 | 375 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
376 | btrfs_update_inode(trans, root, dir); |
377 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 378 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
379 | dir->i_sb->s_dirt = 1; |
380 | } | |
381 | return ret; | |
382 | } | |
383 | ||
384 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
385 | { | |
386 | struct btrfs_root *root; | |
387 | struct btrfs_trans_handle *trans; | |
388 | int ret; | |
d3c2fdcf | 389 | unsigned long nr; |
39279cc3 CM |
390 | |
391 | root = BTRFS_I(dir)->root; | |
392 | mutex_lock(&root->fs_info->fs_mutex); | |
393 | trans = btrfs_start_transaction(root, 1); | |
394 | btrfs_set_trans_block_group(trans, dir); | |
395 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 396 | nr = trans->blocks_used; |
39279cc3 CM |
397 | btrfs_end_transaction(trans, root); |
398 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 399 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
400 | return ret; |
401 | } | |
402 | ||
403 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
404 | { | |
405 | struct inode *inode = dentry->d_inode; | |
406 | int err; | |
407 | int ret; | |
408 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
409 | struct btrfs_path *path; | |
410 | struct btrfs_key key; | |
411 | struct btrfs_trans_handle *trans; | |
412 | struct btrfs_key found_key; | |
413 | int found_type; | |
414 | struct btrfs_leaf *leaf; | |
415 | char *goodnames = ".."; | |
d3c2fdcf | 416 | unsigned long nr; |
39279cc3 CM |
417 | |
418 | path = btrfs_alloc_path(); | |
419 | BUG_ON(!path); | |
39279cc3 CM |
420 | mutex_lock(&root->fs_info->fs_mutex); |
421 | trans = btrfs_start_transaction(root, 1); | |
422 | btrfs_set_trans_block_group(trans, dir); | |
423 | key.objectid = inode->i_ino; | |
424 | key.offset = (u64)-1; | |
425 | key.flags = (u32)-1; | |
426 | while(1) { | |
427 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
428 | if (ret < 0) { | |
429 | err = ret; | |
430 | goto out; | |
431 | } | |
432 | BUG_ON(ret == 0); | |
433 | if (path->slots[0] == 0) { | |
434 | err = -ENOENT; | |
435 | goto out; | |
436 | } | |
437 | path->slots[0]--; | |
438 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
439 | btrfs_disk_key_to_cpu(&found_key, | |
440 | &leaf->items[path->slots[0]].key); | |
441 | found_type = btrfs_key_type(&found_key); | |
442 | if (found_key.objectid != inode->i_ino) { | |
443 | err = -ENOENT; | |
444 | goto out; | |
445 | } | |
446 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
447 | found_type != BTRFS_DIR_INDEX_KEY) || | |
448 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
449 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
450 | err = -ENOTEMPTY; | |
451 | goto out; | |
452 | } | |
453 | ret = btrfs_del_item(trans, root, path); | |
454 | BUG_ON(ret); | |
455 | ||
456 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) | |
457 | break; | |
458 | btrfs_release_path(root, path); | |
459 | } | |
460 | ret = 0; | |
461 | btrfs_release_path(root, path); | |
462 | ||
463 | /* now the directory is empty */ | |
464 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
465 | if (!err) { | |
466 | inode->i_size = 0; | |
467 | } | |
468 | out: | |
469 | btrfs_release_path(root, path); | |
470 | btrfs_free_path(path); | |
471 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 472 | nr = trans->blocks_used; |
39279cc3 | 473 | ret = btrfs_end_transaction(trans, root); |
d3c2fdcf | 474 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
475 | if (ret && !err) |
476 | err = ret; | |
477 | return err; | |
478 | } | |
479 | ||
480 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
481 | struct btrfs_root *root, | |
482 | struct inode *inode) | |
483 | { | |
484 | struct btrfs_path *path; | |
485 | int ret; | |
486 | ||
487 | clear_inode(inode); | |
488 | ||
489 | path = btrfs_alloc_path(); | |
490 | BUG_ON(!path); | |
39279cc3 CM |
491 | ret = btrfs_lookup_inode(trans, root, path, |
492 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
493 | if (ret > 0) |
494 | ret = -ENOENT; | |
495 | if (!ret) | |
496 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
497 | btrfs_free_path(path); |
498 | return ret; | |
499 | } | |
500 | ||
39279cc3 CM |
501 | /* |
502 | * this can truncate away extent items, csum items and directory items. | |
503 | * It starts at a high offset and removes keys until it can't find | |
504 | * any higher than i_size. | |
505 | * | |
506 | * csum items that cross the new i_size are truncated to the new size | |
507 | * as well. | |
508 | */ | |
509 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
510 | struct btrfs_root *root, | |
511 | struct inode *inode) | |
512 | { | |
513 | int ret; | |
514 | struct btrfs_path *path; | |
515 | struct btrfs_key key; | |
516 | struct btrfs_disk_key *found_key; | |
517 | u32 found_type; | |
518 | struct btrfs_leaf *leaf; | |
519 | struct btrfs_file_extent_item *fi; | |
520 | u64 extent_start = 0; | |
521 | u64 extent_num_blocks = 0; | |
522 | u64 item_end = 0; | |
523 | int found_extent; | |
524 | int del_item; | |
525 | ||
a52d9a80 | 526 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 527 | path = btrfs_alloc_path(); |
3c69faec | 528 | path->reada = -1; |
39279cc3 CM |
529 | BUG_ON(!path); |
530 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
531 | key.objectid = inode->i_ino; | |
532 | key.offset = (u64)-1; | |
533 | key.flags = (u32)-1; | |
534 | while(1) { | |
535 | btrfs_init_path(path); | |
536 | fi = NULL; | |
537 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
538 | if (ret < 0) { | |
539 | goto error; | |
540 | } | |
541 | if (ret > 0) { | |
542 | BUG_ON(path->slots[0] == 0); | |
543 | path->slots[0]--; | |
544 | } | |
39279cc3 CM |
545 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
546 | found_key = &leaf->items[path->slots[0]].key; | |
547 | found_type = btrfs_disk_key_type(found_key); | |
548 | ||
549 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) | |
550 | break; | |
551 | if (found_type != BTRFS_CSUM_ITEM_KEY && | |
552 | found_type != BTRFS_DIR_ITEM_KEY && | |
553 | found_type != BTRFS_DIR_INDEX_KEY && | |
554 | found_type != BTRFS_EXTENT_DATA_KEY) | |
555 | break; | |
556 | ||
557 | item_end = btrfs_disk_key_offset(found_key); | |
558 | if (found_type == BTRFS_EXTENT_DATA_KEY) { | |
559 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
560 | path->slots[0], | |
561 | struct btrfs_file_extent_item); | |
562 | if (btrfs_file_extent_type(fi) != | |
563 | BTRFS_FILE_EXTENT_INLINE) { | |
564 | item_end += btrfs_file_extent_num_blocks(fi) << | |
565 | inode->i_blkbits; | |
566 | } | |
567 | } | |
568 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
569 | ret = btrfs_csum_truncate(trans, root, path, | |
570 | inode->i_size); | |
571 | BUG_ON(ret); | |
572 | } | |
573 | if (item_end < inode->i_size) { | |
b888db2b CM |
574 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
575 | found_type = BTRFS_INODE_ITEM_KEY; | |
576 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
577 | found_type = BTRFS_CSUM_ITEM_KEY; | |
578 | } else if (found_type) { | |
579 | found_type--; | |
580 | } else { | |
581 | break; | |
39279cc3 | 582 | } |
a61721d5 | 583 | btrfs_set_key_type(&key, found_type); |
b888db2b | 584 | continue; |
39279cc3 CM |
585 | } |
586 | if (btrfs_disk_key_offset(found_key) >= inode->i_size) | |
587 | del_item = 1; | |
588 | else | |
589 | del_item = 0; | |
590 | found_extent = 0; | |
591 | ||
592 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
593 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
594 | btrfs_file_extent_type(fi) != | |
595 | BTRFS_FILE_EXTENT_INLINE) { | |
596 | u64 num_dec; | |
bab9fb03 | 597 | extent_start = btrfs_file_extent_disk_blocknr(fi); |
39279cc3 CM |
598 | if (!del_item) { |
599 | u64 orig_num_blocks = | |
600 | btrfs_file_extent_num_blocks(fi); | |
601 | extent_num_blocks = inode->i_size - | |
602 | btrfs_disk_key_offset(found_key) + | |
603 | root->blocksize - 1; | |
604 | extent_num_blocks >>= inode->i_blkbits; | |
605 | btrfs_set_file_extent_num_blocks(fi, | |
606 | extent_num_blocks); | |
bab9fb03 Y |
607 | num_dec = (orig_num_blocks - |
608 | extent_num_blocks) << 3; | |
609 | if (extent_start != 0) { | |
610 | inode->i_blocks -= num_dec; | |
611 | } | |
ccd467d6 | 612 | btrfs_mark_buffer_dirty(path->nodes[0]); |
39279cc3 | 613 | } else { |
39279cc3 CM |
614 | extent_num_blocks = |
615 | btrfs_file_extent_disk_num_blocks(fi); | |
616 | /* FIXME blocksize != 4096 */ | |
617 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; | |
618 | if (extent_start != 0) { | |
619 | found_extent = 1; | |
620 | inode->i_blocks -= num_dec; | |
621 | } | |
622 | } | |
623 | } | |
624 | if (del_item) { | |
625 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
626 | if (ret) |
627 | goto error; | |
39279cc3 CM |
628 | } else { |
629 | break; | |
630 | } | |
631 | btrfs_release_path(root, path); | |
632 | if (found_extent) { | |
633 | ret = btrfs_free_extent(trans, root, extent_start, | |
634 | extent_num_blocks, 0); | |
635 | BUG_ON(ret); | |
636 | } | |
637 | } | |
638 | ret = 0; | |
639 | error: | |
640 | btrfs_release_path(root, path); | |
641 | btrfs_free_path(path); | |
642 | inode->i_sb->s_dirt = 1; | |
643 | return ret; | |
644 | } | |
645 | ||
b888db2b | 646 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
647 | size_t zero_start) |
648 | { | |
649 | char *kaddr; | |
650 | int ret = 0; | |
b888db2b | 651 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
a52d9a80 | 652 | u64 page_start = page->index << PAGE_CACHE_SHIFT; |
b888db2b | 653 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 CM |
654 | |
655 | if (!PagePrivate(page)) { | |
656 | SetPagePrivate(page); | |
657 | set_page_private(page, 1); | |
b888db2b | 658 | WARN_ON(!page->mapping->a_ops->invalidatepage); |
a52d9a80 CM |
659 | page_cache_get(page); |
660 | } | |
661 | ||
b888db2b CM |
662 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
663 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
664 | page_end, GFP_NOFS); | |
a52d9a80 | 665 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 666 | kaddr = kmap(page); |
a52d9a80 CM |
667 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
668 | flush_dcache_page(page); | |
b888db2b | 669 | kunmap(page); |
a52d9a80 | 670 | } |
b888db2b CM |
671 | set_page_dirty(page); |
672 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 673 | |
a52d9a80 CM |
674 | return ret; |
675 | } | |
676 | ||
39279cc3 CM |
677 | /* |
678 | * taken from block_truncate_page, but does cow as it zeros out | |
679 | * any bytes left in the last page in the file. | |
680 | */ | |
681 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
682 | { | |
683 | struct inode *inode = mapping->host; | |
684 | unsigned blocksize = 1 << inode->i_blkbits; | |
685 | pgoff_t index = from >> PAGE_CACHE_SHIFT; | |
686 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
687 | struct page *page; | |
39279cc3 | 688 | int ret = 0; |
a52d9a80 | 689 | u64 page_start; |
39279cc3 CM |
690 | |
691 | if ((offset & (blocksize - 1)) == 0) | |
692 | goto out; | |
693 | ||
011410bd | 694 | down_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
695 | ret = -ENOMEM; |
696 | page = grab_cache_page(mapping, index); | |
697 | if (!page) | |
698 | goto out; | |
39279cc3 | 699 | if (!PageUptodate(page)) { |
9ebefb18 | 700 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
701 | lock_page(page); |
702 | if (!PageUptodate(page)) { | |
703 | ret = -EIO; | |
704 | goto out; | |
705 | } | |
706 | } | |
a52d9a80 CM |
707 | page_start = page->index << PAGE_CACHE_SHIFT; |
708 | ||
b888db2b | 709 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 710 | |
39279cc3 CM |
711 | unlock_page(page); |
712 | page_cache_release(page); | |
011410bd | 713 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
714 | out: |
715 | return ret; | |
716 | } | |
717 | ||
718 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
719 | { | |
720 | struct inode *inode = dentry->d_inode; | |
721 | int err; | |
722 | ||
723 | err = inode_change_ok(inode, attr); | |
724 | if (err) | |
725 | return err; | |
726 | ||
727 | if (S_ISREG(inode->i_mode) && | |
728 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
729 | struct btrfs_trans_handle *trans; | |
730 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
731 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
732 | ||
39279cc3 CM |
733 | u64 mask = root->blocksize - 1; |
734 | u64 pos = (inode->i_size + mask) & ~mask; | |
2bf5a725 | 735 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 736 | u64 hole_size; |
2bf5a725 | 737 | u64 alloc_hint; |
39279cc3 CM |
738 | |
739 | if (attr->ia_size <= pos) | |
740 | goto out; | |
741 | ||
742 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
743 | ||
2bf5a725 | 744 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 745 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
746 | |
747 | mutex_lock(&root->fs_info->fs_mutex); | |
748 | trans = btrfs_start_transaction(root, 1); | |
749 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 CM |
750 | err = btrfs_drop_extents(trans, root, inode, |
751 | pos, pos + hole_size, &alloc_hint); | |
752 | ||
753 | hole_size >>= inode->i_blkbits; | |
754 | ||
39279cc3 CM |
755 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, |
756 | pos, 0, 0, hole_size); | |
39279cc3 CM |
757 | btrfs_end_transaction(trans, root); |
758 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 759 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
760 | if (err) |
761 | return err; | |
39279cc3 CM |
762 | } |
763 | out: | |
764 | err = inode_setattr(inode, attr); | |
765 | ||
766 | return err; | |
767 | } | |
768 | void btrfs_delete_inode(struct inode *inode) | |
769 | { | |
770 | struct btrfs_trans_handle *trans; | |
771 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 772 | unsigned long nr; |
39279cc3 CM |
773 | int ret; |
774 | ||
775 | truncate_inode_pages(&inode->i_data, 0); | |
776 | if (is_bad_inode(inode)) { | |
777 | goto no_delete; | |
778 | } | |
779 | inode->i_size = 0; | |
780 | mutex_lock(&root->fs_info->fs_mutex); | |
781 | trans = btrfs_start_transaction(root, 1); | |
782 | btrfs_set_trans_block_group(trans, inode); | |
783 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
54aa1f4d CM |
784 | if (ret) |
785 | goto no_delete_lock; | |
786 | ret = btrfs_free_inode(trans, root, inode); | |
787 | if (ret) | |
788 | goto no_delete_lock; | |
d3c2fdcf | 789 | nr = trans->blocks_used; |
39279cc3 CM |
790 | btrfs_end_transaction(trans, root); |
791 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 792 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 793 | return; |
54aa1f4d CM |
794 | |
795 | no_delete_lock: | |
d3c2fdcf | 796 | nr = trans->blocks_used; |
54aa1f4d CM |
797 | btrfs_end_transaction(trans, root); |
798 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 799 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
800 | no_delete: |
801 | clear_inode(inode); | |
802 | } | |
803 | ||
804 | /* | |
805 | * this returns the key found in the dir entry in the location pointer. | |
806 | * If no dir entries were found, location->objectid is 0. | |
807 | */ | |
808 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
809 | struct btrfs_key *location) | |
810 | { | |
811 | const char *name = dentry->d_name.name; | |
812 | int namelen = dentry->d_name.len; | |
813 | struct btrfs_dir_item *di; | |
814 | struct btrfs_path *path; | |
815 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
816 | int ret; | |
817 | ||
818 | path = btrfs_alloc_path(); | |
819 | BUG_ON(!path); | |
39279cc3 CM |
820 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
821 | namelen, 0); | |
822 | if (!di || IS_ERR(di)) { | |
823 | location->objectid = 0; | |
824 | ret = 0; | |
825 | goto out; | |
826 | } | |
827 | btrfs_disk_key_to_cpu(location, &di->location); | |
828 | out: | |
829 | btrfs_release_path(root, path); | |
830 | btrfs_free_path(path); | |
831 | return ret; | |
832 | } | |
833 | ||
834 | /* | |
835 | * when we hit a tree root in a directory, the btrfs part of the inode | |
836 | * needs to be changed to reflect the root directory of the tree root. This | |
837 | * is kind of like crossing a mount point. | |
838 | */ | |
839 | static int fixup_tree_root_location(struct btrfs_root *root, | |
840 | struct btrfs_key *location, | |
58176a96 JB |
841 | struct btrfs_root **sub_root, |
842 | struct dentry *dentry) | |
39279cc3 CM |
843 | { |
844 | struct btrfs_path *path; | |
845 | struct btrfs_root_item *ri; | |
846 | ||
847 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
848 | return 0; | |
849 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
850 | return 0; | |
851 | ||
852 | path = btrfs_alloc_path(); | |
853 | BUG_ON(!path); | |
854 | mutex_lock(&root->fs_info->fs_mutex); | |
855 | ||
58176a96 JB |
856 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
857 | dentry->d_name.name, | |
858 | dentry->d_name.len); | |
39279cc3 CM |
859 | if (IS_ERR(*sub_root)) |
860 | return PTR_ERR(*sub_root); | |
861 | ||
862 | ri = &(*sub_root)->root_item; | |
863 | location->objectid = btrfs_root_dirid(ri); | |
864 | location->flags = 0; | |
865 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
866 | location->offset = 0; | |
867 | ||
868 | btrfs_free_path(path); | |
869 | mutex_unlock(&root->fs_info->fs_mutex); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
874 | { | |
875 | struct btrfs_iget_args *args = p; | |
876 | inode->i_ino = args->ino; | |
877 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
878 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
879 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
880 | return 0; |
881 | } | |
882 | ||
883 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
884 | { | |
885 | struct btrfs_iget_args *args = opaque; | |
886 | return (args->ino == inode->i_ino && | |
887 | args->root == BTRFS_I(inode)->root); | |
888 | } | |
889 | ||
890 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
891 | struct btrfs_root *root) | |
892 | { | |
893 | struct inode *inode; | |
894 | struct btrfs_iget_args args; | |
895 | args.ino = objectid; | |
896 | args.root = root; | |
897 | ||
898 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
899 | btrfs_init_locked_inode, | |
900 | (void *)&args); | |
901 | return inode; | |
902 | } | |
903 | ||
904 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
905 | struct nameidata *nd) | |
906 | { | |
907 | struct inode * inode; | |
908 | struct btrfs_inode *bi = BTRFS_I(dir); | |
909 | struct btrfs_root *root = bi->root; | |
910 | struct btrfs_root *sub_root = root; | |
911 | struct btrfs_key location; | |
912 | int ret; | |
913 | ||
914 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
915 | return ERR_PTR(-ENAMETOOLONG); | |
916 | mutex_lock(&root->fs_info->fs_mutex); | |
917 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
918 | mutex_unlock(&root->fs_info->fs_mutex); | |
919 | if (ret < 0) | |
920 | return ERR_PTR(ret); | |
921 | inode = NULL; | |
922 | if (location.objectid) { | |
58176a96 JB |
923 | ret = fixup_tree_root_location(root, &location, &sub_root, |
924 | dentry); | |
39279cc3 CM |
925 | if (ret < 0) |
926 | return ERR_PTR(ret); | |
927 | if (ret > 0) | |
928 | return ERR_PTR(-ENOENT); | |
929 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
930 | sub_root); | |
931 | if (!inode) | |
932 | return ERR_PTR(-EACCES); | |
933 | if (inode->i_state & I_NEW) { | |
934 | /* the inode and parent dir are two different roots */ | |
935 | if (sub_root != root) { | |
936 | igrab(inode); | |
937 | sub_root->inode = inode; | |
938 | } | |
939 | BTRFS_I(inode)->root = sub_root; | |
940 | memcpy(&BTRFS_I(inode)->location, &location, | |
941 | sizeof(location)); | |
942 | btrfs_read_locked_inode(inode); | |
943 | unlock_new_inode(inode); | |
944 | } | |
945 | } | |
946 | return d_splice_alias(inode, dentry); | |
947 | } | |
948 | ||
39279cc3 CM |
949 | static unsigned char btrfs_filetype_table[] = { |
950 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
951 | }; | |
952 | ||
953 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
954 | { | |
955 | struct inode *inode = filp->f_path.dentry->d_inode; | |
956 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
957 | struct btrfs_item *item; | |
958 | struct btrfs_dir_item *di; | |
959 | struct btrfs_key key; | |
960 | struct btrfs_path *path; | |
961 | int ret; | |
962 | u32 nritems; | |
963 | struct btrfs_leaf *leaf; | |
964 | int slot; | |
965 | int advance; | |
966 | unsigned char d_type; | |
967 | int over = 0; | |
968 | u32 di_cur; | |
969 | u32 di_total; | |
970 | u32 di_len; | |
971 | int key_type = BTRFS_DIR_INDEX_KEY; | |
972 | ||
973 | /* FIXME, use a real flag for deciding about the key type */ | |
974 | if (root->fs_info->tree_root == root) | |
975 | key_type = BTRFS_DIR_ITEM_KEY; | |
976 | mutex_lock(&root->fs_info->fs_mutex); | |
977 | key.objectid = inode->i_ino; | |
978 | key.flags = 0; | |
979 | btrfs_set_key_type(&key, key_type); | |
980 | key.offset = filp->f_pos; | |
981 | path = btrfs_alloc_path(); | |
2cc58cf2 | 982 | path->reada = 2; |
39279cc3 CM |
983 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
984 | if (ret < 0) | |
985 | goto err; | |
986 | advance = 0; | |
39279cc3 CM |
987 | while(1) { |
988 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
989 | nritems = btrfs_header_nritems(&leaf->header); | |
990 | slot = path->slots[0]; | |
991 | if (advance || slot >= nritems) { | |
992 | if (slot >= nritems -1) { | |
39279cc3 CM |
993 | ret = btrfs_next_leaf(root, path); |
994 | if (ret) | |
995 | break; | |
996 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
997 | nritems = btrfs_header_nritems(&leaf->header); | |
998 | slot = path->slots[0]; | |
999 | } else { | |
1000 | slot++; | |
1001 | path->slots[0]++; | |
1002 | } | |
1003 | } | |
1004 | advance = 1; | |
1005 | item = leaf->items + slot; | |
1006 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) | |
1007 | break; | |
1008 | if (btrfs_disk_key_type(&item->key) != key_type) | |
1009 | break; | |
1010 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) | |
1011 | continue; | |
1012 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
1013 | advance = 1; | |
1014 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1015 | di_cur = 0; | |
1016 | di_total = btrfs_item_size(leaf->items + slot); | |
1017 | while(di_cur < di_total) { | |
1018 | d_type = btrfs_filetype_table[btrfs_dir_type(di)]; | |
1019 | over = filldir(dirent, (const char *)(di + 1), | |
1020 | btrfs_dir_name_len(di), | |
1021 | btrfs_disk_key_offset(&item->key), | |
1022 | btrfs_disk_key_objectid(&di->location), | |
1023 | d_type); | |
1024 | if (over) | |
1025 | goto nopos; | |
1026 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
1027 | di_cur += di_len; | |
1028 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1029 | } | |
1030 | } | |
1031 | filp->f_pos++; | |
1032 | nopos: | |
1033 | ret = 0; | |
1034 | err: | |
1035 | btrfs_release_path(root, path); | |
1036 | btrfs_free_path(path); | |
1037 | mutex_unlock(&root->fs_info->fs_mutex); | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | int btrfs_write_inode(struct inode *inode, int wait) | |
1042 | { | |
1043 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1044 | struct btrfs_trans_handle *trans; | |
1045 | int ret = 0; | |
1046 | ||
1047 | if (wait) { | |
1048 | mutex_lock(&root->fs_info->fs_mutex); | |
1049 | trans = btrfs_start_transaction(root, 1); | |
1050 | btrfs_set_trans_block_group(trans, inode); | |
1051 | ret = btrfs_commit_transaction(trans, root); | |
1052 | mutex_unlock(&root->fs_info->fs_mutex); | |
1053 | } | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | /* | |
54aa1f4d | 1058 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1059 | * inode changes. But, it is most likely to find the inode in cache. |
1060 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1061 | * to keep or drop this code. | |
1062 | */ | |
1063 | void btrfs_dirty_inode(struct inode *inode) | |
1064 | { | |
1065 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1066 | struct btrfs_trans_handle *trans; | |
1067 | ||
1068 | mutex_lock(&root->fs_info->fs_mutex); | |
1069 | trans = btrfs_start_transaction(root, 1); | |
1070 | btrfs_set_trans_block_group(trans, inode); | |
1071 | btrfs_update_inode(trans, root, inode); | |
1072 | btrfs_end_transaction(trans, root); | |
1073 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1074 | } |
1075 | ||
1076 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1077 | struct btrfs_root *root, | |
1078 | u64 objectid, | |
1079 | struct btrfs_block_group_cache *group, | |
1080 | int mode) | |
1081 | { | |
1082 | struct inode *inode; | |
1083 | struct btrfs_inode_item inode_item; | |
1084 | struct btrfs_key *location; | |
1085 | int ret; | |
1086 | int owner; | |
1087 | ||
1088 | inode = new_inode(root->fs_info->sb); | |
1089 | if (!inode) | |
1090 | return ERR_PTR(-ENOMEM); | |
1091 | ||
b888db2b CM |
1092 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1093 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1094 | BTRFS_I(inode)->root = root; |
b888db2b | 1095 | |
39279cc3 CM |
1096 | if (mode & S_IFDIR) |
1097 | owner = 0; | |
1098 | else | |
1099 | owner = 1; | |
1100 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1101 | BTRFS_I(inode)->block_group = group; | |
1102 | ||
1103 | inode->i_uid = current->fsuid; | |
1104 | inode->i_gid = current->fsgid; | |
1105 | inode->i_mode = mode; | |
1106 | inode->i_ino = objectid; | |
1107 | inode->i_blocks = 0; | |
1108 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1109 | fill_inode_item(&inode_item, inode); | |
1110 | location = &BTRFS_I(inode)->location; | |
1111 | location->objectid = objectid; | |
1112 | location->flags = 0; | |
1113 | location->offset = 0; | |
1114 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1115 | ||
1116 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
54aa1f4d CM |
1117 | if (ret) |
1118 | return ERR_PTR(ret); | |
39279cc3 CM |
1119 | insert_inode_hash(inode); |
1120 | return inode; | |
1121 | } | |
1122 | ||
1123 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1124 | { | |
1125 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1126 | } | |
1127 | ||
1128 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1129 | struct dentry *dentry, struct inode *inode) | |
1130 | { | |
1131 | int ret; | |
1132 | struct btrfs_key key; | |
1133 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1134 | struct inode *parent_inode; |
39279cc3 CM |
1135 | key.objectid = inode->i_ino; |
1136 | key.flags = 0; | |
1137 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1138 | key.offset = 0; | |
1139 | ||
1140 | ret = btrfs_insert_dir_item(trans, root, | |
1141 | dentry->d_name.name, dentry->d_name.len, | |
1142 | dentry->d_parent->d_inode->i_ino, | |
1143 | &key, btrfs_inode_type(inode)); | |
1144 | if (ret == 0) { | |
79c44584 CM |
1145 | parent_inode = dentry->d_parent->d_inode; |
1146 | parent_inode->i_size += dentry->d_name.len * 2; | |
1147 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1148 | ret = btrfs_update_inode(trans, root, |
1149 | dentry->d_parent->d_inode); | |
1150 | } | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1155 | struct dentry *dentry, struct inode *inode) | |
1156 | { | |
1157 | int err = btrfs_add_link(trans, dentry, inode); | |
1158 | if (!err) { | |
1159 | d_instantiate(dentry, inode); | |
1160 | return 0; | |
1161 | } | |
1162 | if (err > 0) | |
1163 | err = -EEXIST; | |
1164 | return err; | |
1165 | } | |
1166 | ||
618e21d5 JB |
1167 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1168 | int mode, dev_t rdev) | |
1169 | { | |
1170 | struct btrfs_trans_handle *trans; | |
1171 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1172 | struct inode *inode; | |
1173 | int err; | |
1174 | int drop_inode = 0; | |
1175 | u64 objectid; | |
d3c2fdcf | 1176 | unsigned long nr; |
618e21d5 JB |
1177 | |
1178 | if (!new_valid_dev(rdev)) | |
1179 | return -EINVAL; | |
1180 | ||
1181 | mutex_lock(&root->fs_info->fs_mutex); | |
1182 | trans = btrfs_start_transaction(root, 1); | |
1183 | btrfs_set_trans_block_group(trans, dir); | |
1184 | ||
1185 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1186 | if (err) { | |
1187 | err = -ENOSPC; | |
1188 | goto out_unlock; | |
1189 | } | |
1190 | ||
1191 | inode = btrfs_new_inode(trans, root, objectid, | |
1192 | BTRFS_I(dir)->block_group, mode); | |
1193 | err = PTR_ERR(inode); | |
1194 | if (IS_ERR(inode)) | |
1195 | goto out_unlock; | |
1196 | ||
1197 | btrfs_set_trans_block_group(trans, inode); | |
1198 | err = btrfs_add_nondir(trans, dentry, inode); | |
1199 | if (err) | |
1200 | drop_inode = 1; | |
1201 | else { | |
1202 | inode->i_op = &btrfs_special_inode_operations; | |
1203 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1204 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1205 | } |
1206 | dir->i_sb->s_dirt = 1; | |
1207 | btrfs_update_inode_block_group(trans, inode); | |
1208 | btrfs_update_inode_block_group(trans, dir); | |
1209 | out_unlock: | |
d3c2fdcf | 1210 | nr = trans->blocks_used; |
618e21d5 JB |
1211 | btrfs_end_transaction(trans, root); |
1212 | mutex_unlock(&root->fs_info->fs_mutex); | |
1213 | ||
1214 | if (drop_inode) { | |
1215 | inode_dec_link_count(inode); | |
1216 | iput(inode); | |
1217 | } | |
d3c2fdcf | 1218 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1219 | return err; |
1220 | } | |
1221 | ||
39279cc3 CM |
1222 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1223 | int mode, struct nameidata *nd) | |
1224 | { | |
1225 | struct btrfs_trans_handle *trans; | |
1226 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1227 | struct inode *inode; | |
1228 | int err; | |
1229 | int drop_inode = 0; | |
d3c2fdcf | 1230 | unsigned long nr; |
39279cc3 CM |
1231 | u64 objectid; |
1232 | ||
1233 | mutex_lock(&root->fs_info->fs_mutex); | |
1234 | trans = btrfs_start_transaction(root, 1); | |
1235 | btrfs_set_trans_block_group(trans, dir); | |
1236 | ||
1237 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1238 | if (err) { | |
1239 | err = -ENOSPC; | |
1240 | goto out_unlock; | |
1241 | } | |
1242 | ||
1243 | inode = btrfs_new_inode(trans, root, objectid, | |
1244 | BTRFS_I(dir)->block_group, mode); | |
1245 | err = PTR_ERR(inode); | |
1246 | if (IS_ERR(inode)) | |
1247 | goto out_unlock; | |
1248 | ||
1249 | btrfs_set_trans_block_group(trans, inode); | |
1250 | err = btrfs_add_nondir(trans, dentry, inode); | |
1251 | if (err) | |
1252 | drop_inode = 1; | |
1253 | else { | |
1254 | inode->i_mapping->a_ops = &btrfs_aops; | |
1255 | inode->i_fop = &btrfs_file_operations; | |
1256 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1257 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1258 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1259 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1260 | } |
1261 | dir->i_sb->s_dirt = 1; | |
1262 | btrfs_update_inode_block_group(trans, inode); | |
1263 | btrfs_update_inode_block_group(trans, dir); | |
1264 | out_unlock: | |
d3c2fdcf | 1265 | nr = trans->blocks_used; |
39279cc3 CM |
1266 | btrfs_end_transaction(trans, root); |
1267 | mutex_unlock(&root->fs_info->fs_mutex); | |
1268 | ||
1269 | if (drop_inode) { | |
1270 | inode_dec_link_count(inode); | |
1271 | iput(inode); | |
1272 | } | |
d3c2fdcf | 1273 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1274 | return err; |
1275 | } | |
1276 | ||
1277 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1278 | struct dentry *dentry) | |
1279 | { | |
1280 | struct btrfs_trans_handle *trans; | |
1281 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1282 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1283 | unsigned long nr; |
39279cc3 CM |
1284 | int err; |
1285 | int drop_inode = 0; | |
1286 | ||
1287 | if (inode->i_nlink == 0) | |
1288 | return -ENOENT; | |
1289 | ||
1290 | inc_nlink(inode); | |
1291 | mutex_lock(&root->fs_info->fs_mutex); | |
1292 | trans = btrfs_start_transaction(root, 1); | |
1293 | btrfs_set_trans_block_group(trans, dir); | |
1294 | atomic_inc(&inode->i_count); | |
1295 | err = btrfs_add_nondir(trans, dentry, inode); | |
1296 | if (err) | |
1297 | drop_inode = 1; | |
1298 | dir->i_sb->s_dirt = 1; | |
1299 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d CM |
1300 | err = btrfs_update_inode(trans, root, inode); |
1301 | if (err) | |
1302 | drop_inode = 1; | |
39279cc3 | 1303 | |
d3c2fdcf | 1304 | nr = trans->blocks_used; |
39279cc3 CM |
1305 | btrfs_end_transaction(trans, root); |
1306 | mutex_unlock(&root->fs_info->fs_mutex); | |
1307 | ||
1308 | if (drop_inode) { | |
1309 | inode_dec_link_count(inode); | |
1310 | iput(inode); | |
1311 | } | |
d3c2fdcf | 1312 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1313 | return err; |
1314 | } | |
1315 | ||
1316 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
1317 | struct btrfs_root *root, | |
1318 | u64 objectid, u64 dirid) | |
1319 | { | |
1320 | int ret; | |
1321 | char buf[2]; | |
1322 | struct btrfs_key key; | |
1323 | ||
1324 | buf[0] = '.'; | |
1325 | buf[1] = '.'; | |
1326 | ||
1327 | key.objectid = objectid; | |
1328 | key.offset = 0; | |
1329 | key.flags = 0; | |
1330 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1331 | ||
1332 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, | |
1333 | &key, BTRFS_FT_DIR); | |
1334 | if (ret) | |
1335 | goto error; | |
1336 | key.objectid = dirid; | |
1337 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
1338 | &key, BTRFS_FT_DIR); | |
1339 | if (ret) | |
1340 | goto error; | |
1341 | error: | |
1342 | return ret; | |
1343 | } | |
1344 | ||
1345 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1346 | { | |
1347 | struct inode *inode; | |
1348 | struct btrfs_trans_handle *trans; | |
1349 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1350 | int err = 0; | |
1351 | int drop_on_err = 0; | |
1352 | u64 objectid; | |
d3c2fdcf | 1353 | unsigned long nr = 1; |
39279cc3 CM |
1354 | |
1355 | mutex_lock(&root->fs_info->fs_mutex); | |
1356 | trans = btrfs_start_transaction(root, 1); | |
1357 | btrfs_set_trans_block_group(trans, dir); | |
1358 | if (IS_ERR(trans)) { | |
1359 | err = PTR_ERR(trans); | |
1360 | goto out_unlock; | |
1361 | } | |
1362 | ||
1363 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1364 | if (err) { | |
1365 | err = -ENOSPC; | |
1366 | goto out_unlock; | |
1367 | } | |
1368 | ||
1369 | inode = btrfs_new_inode(trans, root, objectid, | |
1370 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1371 | if (IS_ERR(inode)) { | |
1372 | err = PTR_ERR(inode); | |
1373 | goto out_fail; | |
1374 | } | |
1375 | drop_on_err = 1; | |
1376 | inode->i_op = &btrfs_dir_inode_operations; | |
1377 | inode->i_fop = &btrfs_dir_file_operations; | |
1378 | btrfs_set_trans_block_group(trans, inode); | |
1379 | ||
1380 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); | |
1381 | if (err) | |
1382 | goto out_fail; | |
1383 | ||
1384 | inode->i_size = 6; | |
1385 | err = btrfs_update_inode(trans, root, inode); | |
1386 | if (err) | |
1387 | goto out_fail; | |
1388 | err = btrfs_add_link(trans, dentry, inode); | |
1389 | if (err) | |
1390 | goto out_fail; | |
1391 | d_instantiate(dentry, inode); | |
1392 | drop_on_err = 0; | |
1393 | dir->i_sb->s_dirt = 1; | |
1394 | btrfs_update_inode_block_group(trans, inode); | |
1395 | btrfs_update_inode_block_group(trans, dir); | |
1396 | ||
1397 | out_fail: | |
d3c2fdcf | 1398 | nr = trans->blocks_used; |
39279cc3 CM |
1399 | btrfs_end_transaction(trans, root); |
1400 | out_unlock: | |
1401 | mutex_unlock(&root->fs_info->fs_mutex); | |
1402 | if (drop_on_err) | |
1403 | iput(inode); | |
d3c2fdcf | 1404 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1405 | return err; |
1406 | } | |
1407 | ||
a52d9a80 CM |
1408 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1409 | size_t page_offset, u64 start, u64 end, | |
1410 | int create) | |
1411 | { | |
1412 | int ret; | |
1413 | int err = 0; | |
1414 | u64 blocknr; | |
1415 | u64 extent_start = 0; | |
1416 | u64 extent_end = 0; | |
1417 | u64 objectid = inode->i_ino; | |
1418 | u32 found_type; | |
1419 | int failed_insert = 0; | |
1420 | struct btrfs_path *path; | |
1421 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1422 | struct btrfs_file_extent_item *item; | |
1423 | struct btrfs_leaf *leaf; | |
1424 | struct btrfs_disk_key *found_key; | |
1425 | struct extent_map *em = NULL; | |
1426 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1427 | struct btrfs_trans_handle *trans = NULL; | |
1428 | ||
1429 | path = btrfs_alloc_path(); | |
1430 | BUG_ON(!path); | |
1431 | mutex_lock(&root->fs_info->fs_mutex); | |
1432 | ||
1433 | again: | |
1434 | em = lookup_extent_mapping(em_tree, start, end); | |
1435 | if (em) { | |
1436 | goto out; | |
1437 | } | |
1438 | if (!em) { | |
1439 | em = alloc_extent_map(GFP_NOFS); | |
1440 | if (!em) { | |
1441 | err = -ENOMEM; | |
1442 | goto out; | |
1443 | } | |
1444 | em->start = 0; | |
1445 | em->end = 0; | |
1446 | } | |
1447 | em->bdev = inode->i_sb->s_bdev; | |
1448 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
1449 | objectid, start, 0); | |
1450 | if (ret < 0) { | |
1451 | err = ret; | |
1452 | goto out; | |
1453 | } | |
1454 | ||
1455 | if (ret != 0) { | |
1456 | if (path->slots[0] == 0) | |
1457 | goto not_found; | |
1458 | path->slots[0]--; | |
1459 | } | |
1460 | ||
1461 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], | |
1462 | struct btrfs_file_extent_item); | |
1463 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1464 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
1465 | blocknr += btrfs_file_extent_offset(item); | |
1466 | ||
1467 | /* are we inside the extent that was found? */ | |
1468 | found_key = &leaf->items[path->slots[0]].key; | |
1469 | found_type = btrfs_disk_key_type(found_key); | |
1470 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
1471 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
1472 | goto not_found; | |
1473 | } | |
1474 | ||
1475 | found_type = btrfs_file_extent_type(item); | |
1476 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1477 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1478 | extent_end = extent_start + | |
1479 | (btrfs_file_extent_num_blocks(item) << inode->i_blkbits); | |
1480 | err = 0; | |
b888db2b | 1481 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1482 | em->start = start; |
1483 | if (start < extent_start) { | |
b888db2b CM |
1484 | if (end < extent_start) |
1485 | goto not_found; | |
a52d9a80 CM |
1486 | em->end = extent_end - 1; |
1487 | } else { | |
1488 | em->end = end; | |
1489 | } | |
1490 | goto not_found_em; | |
1491 | } | |
1492 | if (btrfs_file_extent_disk_blocknr(item) == 0) { | |
1493 | em->start = extent_start; | |
1494 | em->end = extent_end - 1; | |
1495 | em->block_start = 0; | |
1496 | em->block_end = 0; | |
1497 | goto insert; | |
1498 | } | |
1499 | em->block_start = blocknr << inode->i_blkbits; | |
1500 | em->block_end = em->block_start + | |
1501 | (btrfs_file_extent_num_blocks(item) << | |
1502 | inode->i_blkbits) - 1; | |
1503 | em->start = extent_start; | |
1504 | em->end = extent_end - 1; | |
1505 | goto insert; | |
1506 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1507 | char *ptr; | |
1508 | char *map; | |
1509 | u32 size; | |
1510 | ||
1511 | size = btrfs_file_extent_inline_len(leaf->items + | |
1512 | path->slots[0]); | |
1513 | extent_end = extent_start + size; | |
b888db2b | 1514 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1515 | em->start = start; |
1516 | if (start < extent_start) { | |
b888db2b CM |
1517 | if (end < extent_start) |
1518 | goto not_found; | |
a52d9a80 CM |
1519 | em->end = extent_end - 1; |
1520 | } else { | |
1521 | em->end = end; | |
1522 | } | |
1523 | goto not_found_em; | |
1524 | } | |
1525 | em->block_start = EXTENT_MAP_INLINE; | |
1526 | em->block_end = EXTENT_MAP_INLINE; | |
1527 | em->start = extent_start; | |
1528 | em->end = extent_end - 1; | |
1529 | if (!page) { | |
1530 | goto insert; | |
1531 | } | |
1532 | ptr = btrfs_file_extent_inline_start(item); | |
1533 | map = kmap(page); | |
1534 | memcpy(map + page_offset, ptr, size); | |
1535 | flush_dcache_page(result->b_page); | |
1536 | kunmap(page); | |
1537 | set_extent_uptodate(em_tree, extent_start, | |
8e1cd766 | 1538 | extent_end - 1, GFP_NOFS); |
a52d9a80 CM |
1539 | goto insert; |
1540 | } else { | |
1541 | printk("unkknown found_type %d\n", found_type); | |
1542 | WARN_ON(1); | |
1543 | } | |
1544 | not_found: | |
1545 | em->start = start; | |
1546 | em->end = end; | |
1547 | not_found_em: | |
1548 | em->block_start = 0; | |
1549 | em->block_end = 0; | |
1550 | insert: | |
1551 | btrfs_release_path(root, path); | |
1552 | if (em->start > start || em->end < start) { | |
b888db2b | 1553 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1554 | err = -EIO; |
1555 | goto out; | |
1556 | } | |
1557 | ret = add_extent_mapping(em_tree, em); | |
1558 | if (ret == -EEXIST) { | |
1559 | free_extent_map(em); | |
2bf5a725 | 1560 | em = NULL; |
a52d9a80 CM |
1561 | failed_insert++; |
1562 | if (failed_insert > 5) { | |
1563 | printk("failing to insert %Lu %Lu\n", start, end); | |
1564 | err = -EIO; | |
1565 | goto out; | |
1566 | } | |
a52d9a80 CM |
1567 | goto again; |
1568 | } | |
1569 | err = 0; | |
1570 | out: | |
1571 | btrfs_free_path(path); | |
1572 | if (trans) { | |
1573 | ret = btrfs_end_transaction(trans, root); | |
1574 | if (!err) | |
1575 | err = ret; | |
1576 | } | |
1577 | mutex_unlock(&root->fs_info->fs_mutex); | |
1578 | if (err) { | |
1579 | free_extent_map(em); | |
1580 | WARN_ON(1); | |
1581 | return ERR_PTR(err); | |
1582 | } | |
1583 | return em; | |
1584 | } | |
1585 | ||
d396c6f5 | 1586 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1587 | { |
d396c6f5 | 1588 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1589 | } |
1590 | ||
1591 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1592 | unsigned from, unsigned to) | |
1593 | { | |
a52d9a80 CM |
1594 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1595 | page->mapping->host, page, from, to, | |
1596 | btrfs_get_extent); | |
39279cc3 CM |
1597 | } |
1598 | ||
a52d9a80 | 1599 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1600 | { |
a52d9a80 CM |
1601 | struct extent_map_tree *tree; |
1602 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1603 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1604 | } |
a52d9a80 | 1605 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1606 | { |
a52d9a80 | 1607 | struct extent_map_tree *tree; |
b888db2b CM |
1608 | |
1609 | ||
1610 | if (current->flags & PF_MEMALLOC) { | |
1611 | redirty_page_for_writepage(wbc, page); | |
1612 | unlock_page(page); | |
1613 | return 0; | |
1614 | } | |
a52d9a80 CM |
1615 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1616 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1617 | } |
1618 | ||
a52d9a80 | 1619 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1620 | { |
a52d9a80 CM |
1621 | struct extent_map_tree *tree; |
1622 | int ret; | |
8c2383c3 | 1623 | |
a52d9a80 CM |
1624 | if (page->private != 1) { |
1625 | WARN_ON(1); | |
1626 | return try_to_free_buffers(page); | |
39279cc3 | 1627 | } |
a52d9a80 CM |
1628 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1629 | ret = try_release_extent_mapping(tree, page); | |
1630 | if (ret == 1) { | |
1631 | ClearPagePrivate(page); | |
1632 | set_page_private(page, 0); | |
1633 | page_cache_release(page); | |
39279cc3 | 1634 | } |
a52d9a80 | 1635 | return ret; |
39279cc3 CM |
1636 | } |
1637 | ||
a52d9a80 | 1638 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1639 | { |
a52d9a80 | 1640 | struct extent_map_tree *tree; |
39279cc3 | 1641 | |
a52d9a80 CM |
1642 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1643 | extent_invalidatepage(tree, page, offset); | |
1644 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1645 | } |
1646 | ||
9ebefb18 CM |
1647 | /* |
1648 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1649 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1650 | * be careful to check for EOF conditions here. We set the page up correctly | |
1651 | * for a written page which means we get ENOSPC checking when writing into | |
1652 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1653 | * support these features. | |
1654 | * | |
1655 | * We are not allowed to take the i_mutex here so we have to play games to | |
1656 | * protect against truncate races as the page could now be beyond EOF. Because | |
1657 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1658 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1659 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1660 | * unlock the page. | |
1661 | */ | |
1662 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1663 | { | |
1664 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1665 | unsigned long end; | |
1666 | loff_t size; | |
1667 | int ret = -EINVAL; | |
a52d9a80 | 1668 | u64 page_start; |
9ebefb18 | 1669 | |
011410bd | 1670 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1671 | lock_page(page); |
1672 | wait_on_page_writeback(page); | |
9ebefb18 | 1673 | size = i_size_read(inode); |
a52d9a80 CM |
1674 | page_start = page->index << PAGE_CACHE_SHIFT; |
1675 | ||
9ebefb18 | 1676 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1677 | (page_start > size)) { |
9ebefb18 CM |
1678 | /* page got truncated out from underneath us */ |
1679 | goto out_unlock; | |
1680 | } | |
1681 | ||
1682 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1683 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1684 | end = size & ~PAGE_CACHE_MASK; |
1685 | else | |
1686 | end = PAGE_CACHE_SIZE; | |
1687 | ||
b888db2b | 1688 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1689 | |
1690 | out_unlock: | |
011410bd | 1691 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1692 | unlock_page(page); |
1693 | return ret; | |
1694 | } | |
1695 | ||
39279cc3 CM |
1696 | static void btrfs_truncate(struct inode *inode) |
1697 | { | |
1698 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1699 | int ret; | |
1700 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1701 | unsigned long nr; |
39279cc3 CM |
1702 | |
1703 | if (!S_ISREG(inode->i_mode)) | |
1704 | return; | |
1705 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1706 | return; | |
1707 | ||
1708 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1709 | ||
1710 | mutex_lock(&root->fs_info->fs_mutex); | |
1711 | trans = btrfs_start_transaction(root, 1); | |
1712 | btrfs_set_trans_block_group(trans, inode); | |
1713 | ||
1714 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1715 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 1716 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 1717 | nr = trans->blocks_used; |
39279cc3 CM |
1718 | ret = btrfs_end_transaction(trans, root); |
1719 | BUG_ON(ret); | |
1720 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1721 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1722 | } |
1723 | ||
1724 | int btrfs_commit_write(struct file *file, struct page *page, | |
1725 | unsigned from, unsigned to) | |
1726 | { | |
a52d9a80 CM |
1727 | return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1728 | page->mapping->host, page, from, to); | |
39279cc3 CM |
1729 | } |
1730 | ||
1731 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1732 | { | |
1733 | struct btrfs_trans_handle *trans; | |
1734 | struct btrfs_key key; | |
1735 | struct btrfs_root_item root_item; | |
1736 | struct btrfs_inode_item *inode_item; | |
1737 | struct buffer_head *subvol; | |
1738 | struct btrfs_leaf *leaf; | |
1739 | struct btrfs_root *new_root; | |
1740 | struct inode *inode; | |
1741 | struct inode *dir; | |
1742 | int ret; | |
54aa1f4d | 1743 | int err; |
39279cc3 CM |
1744 | u64 objectid; |
1745 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 1746 | unsigned long nr = 1; |
39279cc3 CM |
1747 | |
1748 | mutex_lock(&root->fs_info->fs_mutex); | |
1749 | trans = btrfs_start_transaction(root, 1); | |
1750 | BUG_ON(!trans); | |
1751 | ||
6702ed49 | 1752 | subvol = btrfs_alloc_free_block(trans, root, 0, 0); |
54aa1f4d CM |
1753 | if (IS_ERR(subvol)) |
1754 | return PTR_ERR(subvol); | |
39279cc3 CM |
1755 | leaf = btrfs_buffer_leaf(subvol); |
1756 | btrfs_set_header_nritems(&leaf->header, 0); | |
1757 | btrfs_set_header_level(&leaf->header, 0); | |
1758 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); | |
1759 | btrfs_set_header_generation(&leaf->header, trans->transid); | |
1760 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); | |
1761 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, | |
1762 | sizeof(leaf->header.fsid)); | |
ccd467d6 | 1763 | btrfs_mark_buffer_dirty(subvol); |
39279cc3 CM |
1764 | |
1765 | inode_item = &root_item.inode; | |
1766 | memset(inode_item, 0, sizeof(*inode_item)); | |
1767 | btrfs_set_inode_generation(inode_item, 1); | |
1768 | btrfs_set_inode_size(inode_item, 3); | |
1769 | btrfs_set_inode_nlink(inode_item, 1); | |
1770 | btrfs_set_inode_nblocks(inode_item, 1); | |
1771 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
1772 | ||
1773 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); | |
1774 | btrfs_set_root_refs(&root_item, 1); | |
58176a96 | 1775 | btrfs_set_root_blocks_used(&root_item, 0); |
5eda7b5e CM |
1776 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1777 | root_item.drop_level = 0; | |
39279cc3 CM |
1778 | brelse(subvol); |
1779 | subvol = NULL; | |
1780 | ||
1781 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1782 | 0, &objectid); | |
54aa1f4d CM |
1783 | if (ret) |
1784 | goto fail; | |
39279cc3 CM |
1785 | |
1786 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1787 | ||
1788 | key.objectid = objectid; | |
1789 | key.offset = 1; | |
1790 | key.flags = 0; | |
1791 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
1792 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1793 | &root_item); | |
54aa1f4d CM |
1794 | if (ret) |
1795 | goto fail; | |
39279cc3 CM |
1796 | |
1797 | /* | |
1798 | * insert the directory item | |
1799 | */ | |
1800 | key.offset = (u64)-1; | |
1801 | dir = root->fs_info->sb->s_root->d_inode; | |
1802 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1803 | name, namelen, dir->i_ino, &key, | |
1804 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1805 | if (ret) |
1806 | goto fail; | |
39279cc3 CM |
1807 | |
1808 | ret = btrfs_commit_transaction(trans, root); | |
54aa1f4d CM |
1809 | if (ret) |
1810 | goto fail_commit; | |
39279cc3 | 1811 | |
58176a96 | 1812 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
1813 | BUG_ON(!new_root); |
1814 | ||
1815 | trans = btrfs_start_transaction(new_root, 1); | |
1816 | BUG_ON(!trans); | |
1817 | ||
1818 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
1819 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
1820 | if (IS_ERR(inode)) |
1821 | goto fail; | |
39279cc3 CM |
1822 | inode->i_op = &btrfs_dir_inode_operations; |
1823 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 1824 | new_root->inode = inode; |
39279cc3 CM |
1825 | |
1826 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
54aa1f4d CM |
1827 | if (ret) |
1828 | goto fail; | |
39279cc3 CM |
1829 | |
1830 | inode->i_nlink = 1; | |
1831 | inode->i_size = 6; | |
1832 | ret = btrfs_update_inode(trans, new_root, inode); | |
54aa1f4d CM |
1833 | if (ret) |
1834 | goto fail; | |
1835 | fail: | |
d3c2fdcf | 1836 | nr = trans->blocks_used; |
54aa1f4d CM |
1837 | err = btrfs_commit_transaction(trans, root); |
1838 | if (err && !ret) | |
1839 | ret = err; | |
1840 | fail_commit: | |
39279cc3 | 1841 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 1842 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 1843 | return ret; |
39279cc3 CM |
1844 | } |
1845 | ||
1846 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
1847 | { | |
1848 | struct btrfs_trans_handle *trans; | |
1849 | struct btrfs_key key; | |
1850 | struct btrfs_root_item new_root_item; | |
83df7c1d | 1851 | struct buffer_head *tmp; |
39279cc3 | 1852 | int ret; |
54aa1f4d | 1853 | int err; |
39279cc3 | 1854 | u64 objectid; |
d3c2fdcf | 1855 | unsigned long nr; |
39279cc3 CM |
1856 | |
1857 | if (!root->ref_cows) | |
1858 | return -EINVAL; | |
1859 | ||
011410bd CM |
1860 | down_write(&root->snap_sem); |
1861 | freeze_bdev(root->fs_info->sb->s_bdev); | |
1862 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
1863 | ||
39279cc3 CM |
1864 | mutex_lock(&root->fs_info->fs_mutex); |
1865 | trans = btrfs_start_transaction(root, 1); | |
1866 | BUG_ON(!trans); | |
1867 | ||
1868 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
1869 | if (ret) |
1870 | goto fail; | |
39279cc3 CM |
1871 | |
1872 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1873 | 0, &objectid); | |
54aa1f4d CM |
1874 | if (ret) |
1875 | goto fail; | |
39279cc3 CM |
1876 | |
1877 | memcpy(&new_root_item, &root->root_item, | |
1878 | sizeof(new_root_item)); | |
1879 | ||
1880 | key.objectid = objectid; | |
1881 | key.offset = 1; | |
1882 | key.flags = 0; | |
1883 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
83df7c1d | 1884 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
39279cc3 CM |
1885 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
1886 | ||
1887 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1888 | &new_root_item); | |
54aa1f4d CM |
1889 | if (ret) |
1890 | goto fail; | |
39279cc3 CM |
1891 | |
1892 | /* | |
1893 | * insert the directory item | |
1894 | */ | |
1895 | key.offset = (u64)-1; | |
1896 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1897 | name, namelen, | |
1898 | root->fs_info->sb->s_root->d_inode->i_ino, | |
1899 | &key, BTRFS_FT_DIR); | |
1900 | ||
54aa1f4d CM |
1901 | if (ret) |
1902 | goto fail; | |
39279cc3 CM |
1903 | |
1904 | ret = btrfs_inc_root_ref(trans, root); | |
54aa1f4d CM |
1905 | if (ret) |
1906 | goto fail; | |
54aa1f4d | 1907 | fail: |
d3c2fdcf | 1908 | nr = trans->blocks_used; |
54aa1f4d CM |
1909 | err = btrfs_commit_transaction(trans, root); |
1910 | if (err && !ret) | |
1911 | ret = err; | |
39279cc3 | 1912 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 1913 | up_write(&root->snap_sem); |
d3c2fdcf | 1914 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 1915 | return ret; |
39279cc3 CM |
1916 | } |
1917 | ||
86479a04 CM |
1918 | static unsigned long force_ra(struct address_space *mapping, |
1919 | struct file_ra_state *ra, struct file *file, | |
1920 | pgoff_t offset, pgoff_t last_index) | |
1921 | { | |
1922 | pgoff_t req_size; | |
1923 | ||
1924 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
1925 | req_size = last_index - offset + 1; | |
1926 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
1927 | return offset; | |
1928 | #else | |
1929 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
1930 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
1931 | return offset + req_size; | |
1932 | #endif | |
1933 | } | |
1934 | ||
1935 | int btrfs_defrag_file(struct file *file) { | |
1936 | struct inode *inode = file->f_path.dentry->d_inode; | |
1937 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1938 | struct page *page; | |
1939 | unsigned long last_index; | |
1940 | unsigned long ra_index = 0; | |
1941 | u64 page_start; | |
1942 | u64 page_end; | |
1943 | unsigned long i; | |
1944 | ||
1945 | mutex_lock(&inode->i_mutex); | |
1946 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
1947 | for (i = 0; i <= last_index; i++) { | |
1948 | if (i == ra_index) { | |
1949 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
1950 | file, ra_index, last_index); | |
1951 | } | |
1952 | page = grab_cache_page(inode->i_mapping, i); | |
1953 | if (!page) | |
1954 | goto out_unlock; | |
1955 | if (!PageUptodate(page)) { | |
1956 | btrfs_readpage(NULL, page); | |
1957 | lock_page(page); | |
1958 | if (!PageUptodate(page)) { | |
1959 | unlock_page(page); | |
1960 | page_cache_release(page); | |
1961 | goto out_unlock; | |
1962 | } | |
1963 | } | |
1964 | page_start = page->index << PAGE_CACHE_SHIFT; | |
1965 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1966 | ||
1967 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
1968 | set_extent_delalloc(em_tree, page_start, | |
1969 | page_end, GFP_NOFS); | |
1970 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
1971 | set_page_dirty(page); | |
1972 | unlock_page(page); | |
1973 | page_cache_release(page); | |
1974 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
1975 | } | |
1976 | ||
1977 | out_unlock: | |
1978 | mutex_unlock(&inode->i_mutex); | |
1979 | return 0; | |
1980 | } | |
1981 | ||
d03581f4 | 1982 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 1983 | { |
39279cc3 | 1984 | struct btrfs_ioctl_vol_args vol_args; |
39279cc3 | 1985 | struct btrfs_dir_item *di; |
39279cc3 | 1986 | struct btrfs_path *path; |
d03581f4 | 1987 | int namelen; |
39279cc3 CM |
1988 | u64 root_dirid; |
1989 | ||
d03581f4 CH |
1990 | if (copy_from_user(&vol_args, arg, sizeof(vol_args))) |
1991 | return -EFAULT; | |
1992 | ||
1993 | namelen = strlen(vol_args.name); | |
1994 | if (namelen > BTRFS_VOL_NAME_MAX) | |
1995 | return -EINVAL; | |
1996 | if (strchr(vol_args.name, '/')) | |
1997 | return -EINVAL; | |
1998 | ||
1999 | path = btrfs_alloc_path(); | |
2000 | if (!path) | |
2001 | return -ENOMEM; | |
2002 | ||
2003 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2004 | mutex_lock(&root->fs_info->fs_mutex); | |
2005 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2006 | path, root_dirid, | |
2007 | vol_args.name, namelen, 0); | |
2008 | mutex_unlock(&root->fs_info->fs_mutex); | |
2009 | btrfs_free_path(path); | |
2010 | if (di && !IS_ERR(di)) | |
2011 | return -EEXIST; | |
2012 | if (IS_ERR(di)) | |
2013 | return PTR_ERR(di); | |
2014 | ||
2015 | if (root == root->fs_info->tree_root) | |
2016 | return create_subvol(root, vol_args.name, namelen); | |
2017 | return create_snapshot(root, vol_args.name, namelen); | |
2018 | } | |
2019 | ||
2020 | static int btrfs_ioctl_defrag(struct file *file) | |
2021 | { | |
2022 | struct inode *inode = file->f_path.dentry->d_inode; | |
2023 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2024 | ||
2025 | switch (inode->i_mode & S_IFMT) { | |
2026 | case S_IFDIR: | |
39279cc3 | 2027 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2028 | btrfs_defrag_root(root, 0); |
2029 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2030 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2031 | break; |
d03581f4 CH |
2032 | case S_IFREG: |
2033 | btrfs_defrag_file(file); | |
2034 | break; | |
2035 | } | |
2036 | ||
2037 | return 0; | |
2038 | } | |
6702ed49 | 2039 | |
d03581f4 CH |
2040 | long btrfs_ioctl(struct file *file, unsigned int |
2041 | cmd, unsigned long arg) | |
2042 | { | |
2043 | struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root; | |
2044 | ||
2045 | switch (cmd) { | |
2046 | case BTRFS_IOC_SNAP_CREATE: | |
2047 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2048 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2049 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2050 | } |
d03581f4 CH |
2051 | |
2052 | return -ENOTTY; | |
39279cc3 CM |
2053 | } |
2054 | ||
39279cc3 CM |
2055 | /* |
2056 | * Called inside transaction, so use GFP_NOFS | |
2057 | */ | |
2058 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2059 | { | |
2060 | struct btrfs_inode *ei; | |
2061 | ||
2062 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2063 | if (!ei) | |
2064 | return NULL; | |
15ee9bc7 | 2065 | ei->last_trans = 0; |
39279cc3 CM |
2066 | return &ei->vfs_inode; |
2067 | } | |
2068 | ||
2069 | void btrfs_destroy_inode(struct inode *inode) | |
2070 | { | |
2071 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2072 | WARN_ON(inode->i_data.nrpages); | |
2073 | ||
2074 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2075 | } | |
2076 | ||
2077 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2078 | unsigned long flags) | |
2079 | { | |
2080 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2081 | ||
2082 | inode_init_once(&ei->vfs_inode); | |
2083 | } | |
2084 | ||
2085 | void btrfs_destroy_cachep(void) | |
2086 | { | |
2087 | if (btrfs_inode_cachep) | |
2088 | kmem_cache_destroy(btrfs_inode_cachep); | |
2089 | if (btrfs_trans_handle_cachep) | |
2090 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2091 | if (btrfs_transaction_cachep) | |
2092 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2093 | if (btrfs_bit_radix_cachep) | |
2094 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2095 | if (btrfs_path_cachep) | |
2096 | kmem_cache_destroy(btrfs_path_cachep); | |
2097 | } | |
2098 | ||
86479a04 | 2099 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d CM |
2100 | unsigned long extra_flags, |
2101 | void (*ctor)(void *, struct kmem_cache *, | |
2102 | unsigned long)) | |
2103 | { | |
2104 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2105 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2106 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2107 | ,NULL | |
2108 | #endif | |
2109 | ); | |
2110 | } | |
2111 | ||
39279cc3 CM |
2112 | int btrfs_init_cachep(void) |
2113 | { | |
86479a04 | 2114 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2115 | sizeof(struct btrfs_inode), |
2116 | 0, init_once); | |
39279cc3 CM |
2117 | if (!btrfs_inode_cachep) |
2118 | goto fail; | |
86479a04 CM |
2119 | btrfs_trans_handle_cachep = |
2120 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2121 | sizeof(struct btrfs_trans_handle), | |
2122 | 0, NULL); | |
39279cc3 CM |
2123 | if (!btrfs_trans_handle_cachep) |
2124 | goto fail; | |
86479a04 | 2125 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2126 | sizeof(struct btrfs_transaction), |
92fee66d | 2127 | 0, NULL); |
39279cc3 CM |
2128 | if (!btrfs_transaction_cachep) |
2129 | goto fail; | |
86479a04 | 2130 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2131 | sizeof(struct btrfs_path), |
92fee66d | 2132 | 0, NULL); |
39279cc3 CM |
2133 | if (!btrfs_path_cachep) |
2134 | goto fail; | |
86479a04 | 2135 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2136 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2137 | if (!btrfs_bit_radix_cachep) |
2138 | goto fail; | |
2139 | return 0; | |
2140 | fail: | |
2141 | btrfs_destroy_cachep(); | |
2142 | return -ENOMEM; | |
2143 | } | |
2144 | ||
2145 | static int btrfs_getattr(struct vfsmount *mnt, | |
2146 | struct dentry *dentry, struct kstat *stat) | |
2147 | { | |
2148 | struct inode *inode = dentry->d_inode; | |
2149 | generic_fillattr(inode, stat); | |
2150 | stat->blksize = 256 * 1024; | |
2151 | return 0; | |
2152 | } | |
2153 | ||
2154 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2155 | struct inode * new_dir,struct dentry *new_dentry) | |
2156 | { | |
2157 | struct btrfs_trans_handle *trans; | |
2158 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2159 | struct inode *new_inode = new_dentry->d_inode; | |
2160 | struct inode *old_inode = old_dentry->d_inode; | |
2161 | struct timespec ctime = CURRENT_TIME; | |
2162 | struct btrfs_path *path; | |
2163 | struct btrfs_dir_item *di; | |
2164 | int ret; | |
2165 | ||
2166 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2167 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2168 | return -ENOTEMPTY; | |
2169 | } | |
2170 | mutex_lock(&root->fs_info->fs_mutex); | |
2171 | trans = btrfs_start_transaction(root, 1); | |
2172 | btrfs_set_trans_block_group(trans, new_dir); | |
2173 | path = btrfs_alloc_path(); | |
2174 | if (!path) { | |
2175 | ret = -ENOMEM; | |
2176 | goto out_fail; | |
2177 | } | |
2178 | ||
2179 | old_dentry->d_inode->i_nlink++; | |
2180 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2181 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2182 | old_inode->i_ctime = ctime; | |
2183 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2184 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2185 | u64 old_parent_oid; | |
2186 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2187 | "..", 2, -1); | |
2188 | if (IS_ERR(di)) { | |
2189 | ret = PTR_ERR(di); | |
2190 | goto out_fail; | |
2191 | } | |
2192 | if (!di) { | |
2193 | ret = -ENOENT; | |
2194 | goto out_fail; | |
2195 | } | |
2196 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2197 | ret = btrfs_del_item(trans, root, path); | |
2198 | if (ret) { | |
39279cc3 CM |
2199 | goto out_fail; |
2200 | } | |
2201 | btrfs_release_path(root, path); | |
2202 | ||
2203 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2204 | old_inode->i_ino, | |
2205 | old_parent_oid, | |
2206 | "..", 2, -1); | |
2207 | if (IS_ERR(di)) { | |
2208 | ret = PTR_ERR(di); | |
2209 | goto out_fail; | |
2210 | } | |
2211 | if (!di) { | |
2212 | ret = -ENOENT; | |
2213 | goto out_fail; | |
2214 | } | |
2215 | ret = btrfs_del_item(trans, root, path); | |
2216 | if (ret) { | |
39279cc3 CM |
2217 | goto out_fail; |
2218 | } | |
2219 | btrfs_release_path(root, path); | |
2220 | ||
2221 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2222 | old_inode->i_ino, location, | |
2223 | BTRFS_FT_DIR); | |
2224 | if (ret) | |
2225 | goto out_fail; | |
2226 | } | |
2227 | ||
2228 | ||
2229 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); | |
2230 | if (ret) | |
2231 | goto out_fail; | |
2232 | ||
2233 | if (new_inode) { | |
2234 | new_inode->i_ctime = CURRENT_TIME; | |
2235 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2236 | if (ret) | |
2237 | goto out_fail; | |
39279cc3 CM |
2238 | } |
2239 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2240 | if (ret) | |
2241 | goto out_fail; | |
2242 | ||
2243 | out_fail: | |
2244 | btrfs_free_path(path); | |
2245 | btrfs_end_transaction(trans, root); | |
2246 | mutex_unlock(&root->fs_info->fs_mutex); | |
2247 | return ret; | |
2248 | } | |
2249 | ||
2250 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2251 | const char *symname) | |
2252 | { | |
2253 | struct btrfs_trans_handle *trans; | |
2254 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2255 | struct btrfs_path *path; | |
2256 | struct btrfs_key key; | |
2257 | struct inode *inode; | |
2258 | int err; | |
2259 | int drop_inode = 0; | |
2260 | u64 objectid; | |
2261 | int name_len; | |
2262 | int datasize; | |
2263 | char *ptr; | |
2264 | struct btrfs_file_extent_item *ei; | |
d3c2fdcf | 2265 | unsigned long nr; |
39279cc3 CM |
2266 | |
2267 | name_len = strlen(symname) + 1; | |
2268 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2269 | return -ENAMETOOLONG; | |
2270 | mutex_lock(&root->fs_info->fs_mutex); | |
2271 | trans = btrfs_start_transaction(root, 1); | |
2272 | btrfs_set_trans_block_group(trans, dir); | |
2273 | ||
2274 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2275 | if (err) { | |
2276 | err = -ENOSPC; | |
2277 | goto out_unlock; | |
2278 | } | |
2279 | ||
2280 | inode = btrfs_new_inode(trans, root, objectid, | |
2281 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2282 | err = PTR_ERR(inode); | |
2283 | if (IS_ERR(inode)) | |
2284 | goto out_unlock; | |
2285 | ||
2286 | btrfs_set_trans_block_group(trans, inode); | |
2287 | err = btrfs_add_nondir(trans, dentry, inode); | |
2288 | if (err) | |
2289 | drop_inode = 1; | |
2290 | else { | |
2291 | inode->i_mapping->a_ops = &btrfs_aops; | |
2292 | inode->i_fop = &btrfs_file_operations; | |
2293 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2294 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2295 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2296 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2297 | } |
2298 | dir->i_sb->s_dirt = 1; | |
2299 | btrfs_update_inode_block_group(trans, inode); | |
2300 | btrfs_update_inode_block_group(trans, dir); | |
2301 | if (drop_inode) | |
2302 | goto out_unlock; | |
2303 | ||
2304 | path = btrfs_alloc_path(); | |
2305 | BUG_ON(!path); | |
2306 | key.objectid = inode->i_ino; | |
2307 | key.offset = 0; | |
2308 | key.flags = 0; | |
2309 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2310 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2311 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2312 | datasize); | |
54aa1f4d CM |
2313 | if (err) { |
2314 | drop_inode = 1; | |
2315 | goto out_unlock; | |
2316 | } | |
39279cc3 CM |
2317 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
2318 | path->slots[0], struct btrfs_file_extent_item); | |
2319 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2320 | btrfs_set_file_extent_type(ei, | |
2321 | BTRFS_FILE_EXTENT_INLINE); | |
2322 | ptr = btrfs_file_extent_inline_start(ei); | |
2323 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2324 | ptr, symname, name_len); | |
ccd467d6 | 2325 | btrfs_mark_buffer_dirty(path->nodes[0]); |
39279cc3 CM |
2326 | btrfs_free_path(path); |
2327 | inode->i_op = &btrfs_symlink_inode_operations; | |
2328 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2329 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2330 | err = btrfs_update_inode(trans, root, inode); |
2331 | if (err) | |
2332 | drop_inode = 1; | |
39279cc3 CM |
2333 | |
2334 | out_unlock: | |
d3c2fdcf | 2335 | nr = trans->blocks_used; |
39279cc3 CM |
2336 | btrfs_end_transaction(trans, root); |
2337 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2338 | if (drop_inode) { |
2339 | inode_dec_link_count(inode); | |
2340 | iput(inode); | |
2341 | } | |
d3c2fdcf | 2342 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2343 | return err; |
2344 | } | |
2345 | ||
2346 | static struct inode_operations btrfs_dir_inode_operations = { | |
2347 | .lookup = btrfs_lookup, | |
2348 | .create = btrfs_create, | |
2349 | .unlink = btrfs_unlink, | |
2350 | .link = btrfs_link, | |
2351 | .mkdir = btrfs_mkdir, | |
2352 | .rmdir = btrfs_rmdir, | |
2353 | .rename = btrfs_rename, | |
2354 | .symlink = btrfs_symlink, | |
2355 | .setattr = btrfs_setattr, | |
618e21d5 | 2356 | .mknod = btrfs_mknod, |
39279cc3 CM |
2357 | }; |
2358 | ||
2359 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2360 | .lookup = btrfs_lookup, | |
2361 | }; | |
2362 | ||
2363 | static struct file_operations btrfs_dir_file_operations = { | |
2364 | .llseek = generic_file_llseek, | |
2365 | .read = generic_read_dir, | |
2366 | .readdir = btrfs_readdir, | |
34287aa3 | 2367 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2368 | #ifdef CONFIG_COMPAT |
34287aa3 | 2369 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2370 | #endif |
2371 | }; | |
2372 | ||
07157aac CM |
2373 | static struct extent_map_ops btrfs_extent_map_ops = { |
2374 | .fill_delalloc = run_delalloc_range, | |
2375 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2376 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2377 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2378 | }; | |
2379 | ||
39279cc3 CM |
2380 | static struct address_space_operations btrfs_aops = { |
2381 | .readpage = btrfs_readpage, | |
2382 | .writepage = btrfs_writepage, | |
2383 | .sync_page = block_sync_page, | |
2384 | .prepare_write = btrfs_prepare_write, | |
2385 | .commit_write = btrfs_commit_write, | |
2386 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2387 | .invalidatepage = btrfs_invalidatepage, |
2388 | .releasepage = btrfs_releasepage, | |
2389 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2390 | }; |
2391 | ||
2392 | static struct address_space_operations btrfs_symlink_aops = { | |
2393 | .readpage = btrfs_readpage, | |
2394 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2395 | .invalidatepage = btrfs_invalidatepage, |
2396 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2397 | }; |
2398 | ||
2399 | static struct inode_operations btrfs_file_inode_operations = { | |
2400 | .truncate = btrfs_truncate, | |
2401 | .getattr = btrfs_getattr, | |
2402 | .setattr = btrfs_setattr, | |
2403 | }; | |
2404 | ||
618e21d5 JB |
2405 | static struct inode_operations btrfs_special_inode_operations = { |
2406 | .getattr = btrfs_getattr, | |
2407 | .setattr = btrfs_setattr, | |
2408 | }; | |
2409 | ||
39279cc3 CM |
2410 | static struct inode_operations btrfs_symlink_inode_operations = { |
2411 | .readlink = generic_readlink, | |
2412 | .follow_link = page_follow_link_light, | |
2413 | .put_link = page_put_link, | |
2414 | }; |