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) { | |
209 | btrfs_free_path(path); | |
210 | goto make_bad; | |
211 | } | |
212 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
213 | path->slots[0], | |
214 | struct btrfs_inode_item); | |
215 | ||
216 | inode->i_mode = btrfs_inode_mode(inode_item); | |
217 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
218 | inode->i_uid = btrfs_inode_uid(inode_item); | |
219 | inode->i_gid = btrfs_inode_gid(inode_item); | |
220 | inode->i_size = btrfs_inode_size(inode_item); | |
221 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
222 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
223 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
224 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
225 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
226 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
227 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
228 | inode->i_generation = btrfs_inode_generation(inode_item); | |
618e21d5 JB |
229 | inode->i_rdev = 0; |
230 | rdev = btrfs_inode_rdev(inode_item); | |
39279cc3 CM |
231 | alloc_group_block = btrfs_inode_block_group(inode_item); |
232 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, | |
233 | alloc_group_block); | |
234 | ||
235 | btrfs_free_path(path); | |
236 | inode_item = NULL; | |
237 | ||
238 | mutex_unlock(&root->fs_info->fs_mutex); | |
239 | ||
240 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
241 | case S_IFREG: |
242 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 243 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
244 | inode->i_fop = &btrfs_file_operations; |
245 | inode->i_op = &btrfs_file_inode_operations; | |
246 | break; | |
247 | case S_IFDIR: | |
248 | inode->i_fop = &btrfs_dir_file_operations; | |
249 | if (root == root->fs_info->tree_root) | |
250 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
251 | else | |
252 | inode->i_op = &btrfs_dir_inode_operations; | |
253 | break; | |
254 | case S_IFLNK: | |
255 | inode->i_op = &btrfs_symlink_inode_operations; | |
256 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
257 | break; | |
618e21d5 JB |
258 | default: |
259 | init_special_inode(inode, inode->i_mode, rdev); | |
260 | break; | |
39279cc3 CM |
261 | } |
262 | return; | |
263 | ||
264 | make_bad: | |
265 | btrfs_release_path(root, path); | |
266 | btrfs_free_path(path); | |
267 | mutex_unlock(&root->fs_info->fs_mutex); | |
268 | make_bad_inode(inode); | |
269 | } | |
270 | ||
271 | static void fill_inode_item(struct btrfs_inode_item *item, | |
272 | struct inode *inode) | |
273 | { | |
274 | btrfs_set_inode_uid(item, inode->i_uid); | |
275 | btrfs_set_inode_gid(item, inode->i_gid); | |
276 | btrfs_set_inode_size(item, inode->i_size); | |
277 | btrfs_set_inode_mode(item, inode->i_mode); | |
278 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
279 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
280 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
281 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
282 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
283 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
284 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
285 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
286 | btrfs_set_inode_generation(item, inode->i_generation); | |
618e21d5 | 287 | btrfs_set_inode_rdev(item, inode->i_rdev); |
39279cc3 CM |
288 | btrfs_set_inode_block_group(item, |
289 | BTRFS_I(inode)->block_group->key.objectid); | |
290 | } | |
291 | ||
a52d9a80 | 292 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
293 | struct btrfs_root *root, |
294 | struct inode *inode) | |
295 | { | |
296 | struct btrfs_inode_item *inode_item; | |
297 | struct btrfs_path *path; | |
298 | int ret; | |
299 | ||
300 | path = btrfs_alloc_path(); | |
301 | BUG_ON(!path); | |
39279cc3 CM |
302 | ret = btrfs_lookup_inode(trans, root, path, |
303 | &BTRFS_I(inode)->location, 1); | |
304 | if (ret) { | |
305 | if (ret > 0) | |
306 | ret = -ENOENT; | |
307 | goto failed; | |
308 | } | |
309 | ||
310 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
311 | path->slots[0], | |
312 | struct btrfs_inode_item); | |
313 | ||
314 | fill_inode_item(inode_item, inode); | |
315 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
15ee9bc7 | 316 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
317 | ret = 0; |
318 | failed: | |
319 | btrfs_release_path(root, path); | |
320 | btrfs_free_path(path); | |
321 | return ret; | |
322 | } | |
323 | ||
324 | ||
325 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
326 | struct btrfs_root *root, | |
327 | struct inode *dir, | |
328 | struct dentry *dentry) | |
329 | { | |
330 | struct btrfs_path *path; | |
331 | const char *name = dentry->d_name.name; | |
332 | int name_len = dentry->d_name.len; | |
333 | int ret = 0; | |
334 | u64 objectid; | |
335 | struct btrfs_dir_item *di; | |
336 | ||
337 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
338 | if (!path) { |
339 | ret = -ENOMEM; | |
340 | goto err; | |
341 | } | |
342 | ||
39279cc3 CM |
343 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
344 | name, name_len, -1); | |
345 | if (IS_ERR(di)) { | |
346 | ret = PTR_ERR(di); | |
347 | goto err; | |
348 | } | |
349 | if (!di) { | |
350 | ret = -ENOENT; | |
351 | goto err; | |
352 | } | |
353 | objectid = btrfs_disk_key_objectid(&di->location); | |
354 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
54aa1f4d CM |
355 | if (ret) |
356 | goto err; | |
39279cc3 CM |
357 | btrfs_release_path(root, path); |
358 | ||
359 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
360 | objectid, name, name_len, -1); | |
361 | if (IS_ERR(di)) { | |
362 | ret = PTR_ERR(di); | |
363 | goto err; | |
364 | } | |
365 | if (!di) { | |
366 | ret = -ENOENT; | |
367 | goto err; | |
368 | } | |
369 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
370 | |
371 | dentry->d_inode->i_ctime = dir->i_ctime; | |
372 | err: | |
373 | btrfs_free_path(path); | |
374 | if (!ret) { | |
375 | dir->i_size -= name_len * 2; | |
79c44584 | 376 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
377 | btrfs_update_inode(trans, root, dir); |
378 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 379 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
380 | dir->i_sb->s_dirt = 1; |
381 | } | |
382 | return ret; | |
383 | } | |
384 | ||
385 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
386 | { | |
387 | struct btrfs_root *root; | |
388 | struct btrfs_trans_handle *trans; | |
389 | int ret; | |
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); | |
396 | btrfs_end_transaction(trans, root); | |
397 | mutex_unlock(&root->fs_info->fs_mutex); | |
398 | btrfs_btree_balance_dirty(root); | |
399 | return ret; | |
400 | } | |
401 | ||
402 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
403 | { | |
404 | struct inode *inode = dentry->d_inode; | |
405 | int err; | |
406 | int ret; | |
407 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
408 | struct btrfs_path *path; | |
409 | struct btrfs_key key; | |
410 | struct btrfs_trans_handle *trans; | |
411 | struct btrfs_key found_key; | |
412 | int found_type; | |
413 | struct btrfs_leaf *leaf; | |
414 | char *goodnames = ".."; | |
415 | ||
416 | path = btrfs_alloc_path(); | |
417 | BUG_ON(!path); | |
39279cc3 CM |
418 | mutex_lock(&root->fs_info->fs_mutex); |
419 | trans = btrfs_start_transaction(root, 1); | |
420 | btrfs_set_trans_block_group(trans, dir); | |
421 | key.objectid = inode->i_ino; | |
422 | key.offset = (u64)-1; | |
423 | key.flags = (u32)-1; | |
424 | while(1) { | |
425 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
426 | if (ret < 0) { | |
427 | err = ret; | |
428 | goto out; | |
429 | } | |
430 | BUG_ON(ret == 0); | |
431 | if (path->slots[0] == 0) { | |
432 | err = -ENOENT; | |
433 | goto out; | |
434 | } | |
435 | path->slots[0]--; | |
436 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
437 | btrfs_disk_key_to_cpu(&found_key, | |
438 | &leaf->items[path->slots[0]].key); | |
439 | found_type = btrfs_key_type(&found_key); | |
440 | if (found_key.objectid != inode->i_ino) { | |
441 | err = -ENOENT; | |
442 | goto out; | |
443 | } | |
444 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
445 | found_type != BTRFS_DIR_INDEX_KEY) || | |
446 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
447 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
448 | err = -ENOTEMPTY; | |
449 | goto out; | |
450 | } | |
451 | ret = btrfs_del_item(trans, root, path); | |
452 | BUG_ON(ret); | |
453 | ||
454 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) | |
455 | break; | |
456 | btrfs_release_path(root, path); | |
457 | } | |
458 | ret = 0; | |
459 | btrfs_release_path(root, path); | |
460 | ||
461 | /* now the directory is empty */ | |
462 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
463 | if (!err) { | |
464 | inode->i_size = 0; | |
465 | } | |
466 | out: | |
467 | btrfs_release_path(root, path); | |
468 | btrfs_free_path(path); | |
469 | mutex_unlock(&root->fs_info->fs_mutex); | |
470 | ret = btrfs_end_transaction(trans, root); | |
471 | btrfs_btree_balance_dirty(root); | |
472 | if (ret && !err) | |
473 | err = ret; | |
474 | return err; | |
475 | } | |
476 | ||
477 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
478 | struct btrfs_root *root, | |
479 | struct inode *inode) | |
480 | { | |
481 | struct btrfs_path *path; | |
482 | int ret; | |
483 | ||
484 | clear_inode(inode); | |
485 | ||
486 | path = btrfs_alloc_path(); | |
487 | BUG_ON(!path); | |
39279cc3 CM |
488 | ret = btrfs_lookup_inode(trans, root, path, |
489 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
490 | if (ret > 0) |
491 | ret = -ENOENT; | |
492 | if (!ret) | |
493 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
494 | btrfs_free_path(path); |
495 | return ret; | |
496 | } | |
497 | ||
39279cc3 CM |
498 | /* |
499 | * this can truncate away extent items, csum items and directory items. | |
500 | * It starts at a high offset and removes keys until it can't find | |
501 | * any higher than i_size. | |
502 | * | |
503 | * csum items that cross the new i_size are truncated to the new size | |
504 | * as well. | |
505 | */ | |
506 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
507 | struct btrfs_root *root, | |
508 | struct inode *inode) | |
509 | { | |
510 | int ret; | |
511 | struct btrfs_path *path; | |
512 | struct btrfs_key key; | |
513 | struct btrfs_disk_key *found_key; | |
514 | u32 found_type; | |
515 | struct btrfs_leaf *leaf; | |
516 | struct btrfs_file_extent_item *fi; | |
517 | u64 extent_start = 0; | |
518 | u64 extent_num_blocks = 0; | |
519 | u64 item_end = 0; | |
520 | int found_extent; | |
521 | int del_item; | |
522 | ||
a52d9a80 | 523 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 524 | path = btrfs_alloc_path(); |
3c69faec | 525 | path->reada = -1; |
39279cc3 CM |
526 | BUG_ON(!path); |
527 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
528 | key.objectid = inode->i_ino; | |
529 | key.offset = (u64)-1; | |
530 | key.flags = (u32)-1; | |
531 | while(1) { | |
532 | btrfs_init_path(path); | |
533 | fi = NULL; | |
534 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
535 | if (ret < 0) { | |
536 | goto error; | |
537 | } | |
538 | if (ret > 0) { | |
539 | BUG_ON(path->slots[0] == 0); | |
540 | path->slots[0]--; | |
541 | } | |
39279cc3 CM |
542 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
543 | found_key = &leaf->items[path->slots[0]].key; | |
544 | found_type = btrfs_disk_key_type(found_key); | |
545 | ||
546 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) | |
547 | break; | |
548 | if (found_type != BTRFS_CSUM_ITEM_KEY && | |
549 | found_type != BTRFS_DIR_ITEM_KEY && | |
550 | found_type != BTRFS_DIR_INDEX_KEY && | |
551 | found_type != BTRFS_EXTENT_DATA_KEY) | |
552 | break; | |
553 | ||
554 | item_end = btrfs_disk_key_offset(found_key); | |
555 | if (found_type == BTRFS_EXTENT_DATA_KEY) { | |
556 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
557 | path->slots[0], | |
558 | struct btrfs_file_extent_item); | |
559 | if (btrfs_file_extent_type(fi) != | |
560 | BTRFS_FILE_EXTENT_INLINE) { | |
561 | item_end += btrfs_file_extent_num_blocks(fi) << | |
562 | inode->i_blkbits; | |
563 | } | |
564 | } | |
565 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
566 | ret = btrfs_csum_truncate(trans, root, path, | |
567 | inode->i_size); | |
568 | BUG_ON(ret); | |
569 | } | |
570 | if (item_end < inode->i_size) { | |
b888db2b CM |
571 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
572 | found_type = BTRFS_INODE_ITEM_KEY; | |
573 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
574 | found_type = BTRFS_CSUM_ITEM_KEY; | |
575 | } else if (found_type) { | |
576 | found_type--; | |
577 | } else { | |
578 | break; | |
39279cc3 | 579 | } |
b888db2b CM |
580 | btrfs_set_key_type(&key, found_type - 1); |
581 | continue; | |
39279cc3 CM |
582 | } |
583 | if (btrfs_disk_key_offset(found_key) >= inode->i_size) | |
584 | del_item = 1; | |
585 | else | |
586 | del_item = 0; | |
587 | found_extent = 0; | |
588 | ||
589 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
590 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
591 | btrfs_file_extent_type(fi) != | |
592 | BTRFS_FILE_EXTENT_INLINE) { | |
593 | u64 num_dec; | |
594 | if (!del_item) { | |
595 | u64 orig_num_blocks = | |
596 | btrfs_file_extent_num_blocks(fi); | |
597 | extent_num_blocks = inode->i_size - | |
598 | btrfs_disk_key_offset(found_key) + | |
599 | root->blocksize - 1; | |
600 | extent_num_blocks >>= inode->i_blkbits; | |
601 | btrfs_set_file_extent_num_blocks(fi, | |
602 | extent_num_blocks); | |
603 | inode->i_blocks -= (orig_num_blocks - | |
604 | extent_num_blocks) << 3; | |
ccd467d6 | 605 | btrfs_mark_buffer_dirty(path->nodes[0]); |
39279cc3 CM |
606 | } else { |
607 | extent_start = | |
608 | btrfs_file_extent_disk_blocknr(fi); | |
609 | extent_num_blocks = | |
610 | btrfs_file_extent_disk_num_blocks(fi); | |
611 | /* FIXME blocksize != 4096 */ | |
612 | num_dec = btrfs_file_extent_num_blocks(fi) << 3; | |
613 | if (extent_start != 0) { | |
614 | found_extent = 1; | |
615 | inode->i_blocks -= num_dec; | |
616 | } | |
617 | } | |
618 | } | |
619 | if (del_item) { | |
620 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
621 | if (ret) |
622 | goto error; | |
39279cc3 CM |
623 | } else { |
624 | break; | |
625 | } | |
626 | btrfs_release_path(root, path); | |
627 | if (found_extent) { | |
628 | ret = btrfs_free_extent(trans, root, extent_start, | |
629 | extent_num_blocks, 0); | |
630 | BUG_ON(ret); | |
631 | } | |
632 | } | |
633 | ret = 0; | |
634 | error: | |
635 | btrfs_release_path(root, path); | |
636 | btrfs_free_path(path); | |
637 | inode->i_sb->s_dirt = 1; | |
638 | return ret; | |
639 | } | |
640 | ||
b888db2b | 641 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
642 | size_t zero_start) |
643 | { | |
644 | char *kaddr; | |
645 | int ret = 0; | |
b888db2b | 646 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
a52d9a80 | 647 | u64 page_start = page->index << PAGE_CACHE_SHIFT; |
b888db2b | 648 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 CM |
649 | |
650 | if (!PagePrivate(page)) { | |
651 | SetPagePrivate(page); | |
652 | set_page_private(page, 1); | |
b888db2b | 653 | WARN_ON(!page->mapping->a_ops->invalidatepage); |
a52d9a80 CM |
654 | page_cache_get(page); |
655 | } | |
656 | ||
b888db2b CM |
657 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
658 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
659 | page_end, GFP_NOFS); | |
a52d9a80 | 660 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 661 | kaddr = kmap(page); |
a52d9a80 CM |
662 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
663 | flush_dcache_page(page); | |
b888db2b | 664 | kunmap(page); |
a52d9a80 | 665 | } |
b888db2b CM |
666 | set_page_dirty(page); |
667 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 668 | |
a52d9a80 CM |
669 | return ret; |
670 | } | |
671 | ||
39279cc3 CM |
672 | /* |
673 | * taken from block_truncate_page, but does cow as it zeros out | |
674 | * any bytes left in the last page in the file. | |
675 | */ | |
676 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
677 | { | |
678 | struct inode *inode = mapping->host; | |
679 | unsigned blocksize = 1 << inode->i_blkbits; | |
680 | pgoff_t index = from >> PAGE_CACHE_SHIFT; | |
681 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
682 | struct page *page; | |
39279cc3 | 683 | int ret = 0; |
a52d9a80 | 684 | u64 page_start; |
39279cc3 CM |
685 | |
686 | if ((offset & (blocksize - 1)) == 0) | |
687 | goto out; | |
688 | ||
011410bd | 689 | down_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
690 | ret = -ENOMEM; |
691 | page = grab_cache_page(mapping, index); | |
692 | if (!page) | |
693 | goto out; | |
39279cc3 | 694 | if (!PageUptodate(page)) { |
9ebefb18 | 695 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
696 | lock_page(page); |
697 | if (!PageUptodate(page)) { | |
698 | ret = -EIO; | |
699 | goto out; | |
700 | } | |
701 | } | |
a52d9a80 CM |
702 | page_start = page->index << PAGE_CACHE_SHIFT; |
703 | ||
b888db2b | 704 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 705 | |
39279cc3 CM |
706 | unlock_page(page); |
707 | page_cache_release(page); | |
011410bd | 708 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
709 | out: |
710 | return ret; | |
711 | } | |
712 | ||
713 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
714 | { | |
715 | struct inode *inode = dentry->d_inode; | |
716 | int err; | |
717 | ||
718 | err = inode_change_ok(inode, attr); | |
719 | if (err) | |
720 | return err; | |
721 | ||
722 | if (S_ISREG(inode->i_mode) && | |
723 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
724 | struct btrfs_trans_handle *trans; | |
725 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
726 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
727 | ||
39279cc3 CM |
728 | u64 mask = root->blocksize - 1; |
729 | u64 pos = (inode->i_size + mask) & ~mask; | |
2bf5a725 | 730 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 731 | u64 hole_size; |
2bf5a725 | 732 | u64 alloc_hint; |
39279cc3 CM |
733 | |
734 | if (attr->ia_size <= pos) | |
735 | goto out; | |
736 | ||
737 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
738 | ||
2bf5a725 | 739 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 740 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
741 | |
742 | mutex_lock(&root->fs_info->fs_mutex); | |
743 | trans = btrfs_start_transaction(root, 1); | |
744 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 CM |
745 | err = btrfs_drop_extents(trans, root, inode, |
746 | pos, pos + hole_size, &alloc_hint); | |
747 | ||
748 | hole_size >>= inode->i_blkbits; | |
749 | ||
39279cc3 CM |
750 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, |
751 | pos, 0, 0, hole_size); | |
39279cc3 CM |
752 | btrfs_end_transaction(trans, root); |
753 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 754 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
755 | if (err) |
756 | return err; | |
39279cc3 CM |
757 | } |
758 | out: | |
759 | err = inode_setattr(inode, attr); | |
760 | ||
761 | return err; | |
762 | } | |
763 | void btrfs_delete_inode(struct inode *inode) | |
764 | { | |
765 | struct btrfs_trans_handle *trans; | |
766 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
767 | int ret; | |
768 | ||
769 | truncate_inode_pages(&inode->i_data, 0); | |
770 | if (is_bad_inode(inode)) { | |
771 | goto no_delete; | |
772 | } | |
773 | inode->i_size = 0; | |
774 | mutex_lock(&root->fs_info->fs_mutex); | |
775 | trans = btrfs_start_transaction(root, 1); | |
776 | btrfs_set_trans_block_group(trans, inode); | |
777 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
54aa1f4d CM |
778 | if (ret) |
779 | goto no_delete_lock; | |
780 | ret = btrfs_free_inode(trans, root, inode); | |
781 | if (ret) | |
782 | goto no_delete_lock; | |
39279cc3 CM |
783 | btrfs_end_transaction(trans, root); |
784 | mutex_unlock(&root->fs_info->fs_mutex); | |
785 | btrfs_btree_balance_dirty(root); | |
786 | return; | |
54aa1f4d CM |
787 | |
788 | no_delete_lock: | |
789 | btrfs_end_transaction(trans, root); | |
790 | mutex_unlock(&root->fs_info->fs_mutex); | |
791 | btrfs_btree_balance_dirty(root); | |
39279cc3 CM |
792 | no_delete: |
793 | clear_inode(inode); | |
794 | } | |
795 | ||
796 | /* | |
797 | * this returns the key found in the dir entry in the location pointer. | |
798 | * If no dir entries were found, location->objectid is 0. | |
799 | */ | |
800 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
801 | struct btrfs_key *location) | |
802 | { | |
803 | const char *name = dentry->d_name.name; | |
804 | int namelen = dentry->d_name.len; | |
805 | struct btrfs_dir_item *di; | |
806 | struct btrfs_path *path; | |
807 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
808 | int ret; | |
809 | ||
810 | path = btrfs_alloc_path(); | |
811 | BUG_ON(!path); | |
39279cc3 CM |
812 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
813 | namelen, 0); | |
814 | if (!di || IS_ERR(di)) { | |
815 | location->objectid = 0; | |
816 | ret = 0; | |
817 | goto out; | |
818 | } | |
819 | btrfs_disk_key_to_cpu(location, &di->location); | |
820 | out: | |
821 | btrfs_release_path(root, path); | |
822 | btrfs_free_path(path); | |
823 | return ret; | |
824 | } | |
825 | ||
826 | /* | |
827 | * when we hit a tree root in a directory, the btrfs part of the inode | |
828 | * needs to be changed to reflect the root directory of the tree root. This | |
829 | * is kind of like crossing a mount point. | |
830 | */ | |
831 | static int fixup_tree_root_location(struct btrfs_root *root, | |
832 | struct btrfs_key *location, | |
58176a96 JB |
833 | struct btrfs_root **sub_root, |
834 | struct dentry *dentry) | |
39279cc3 CM |
835 | { |
836 | struct btrfs_path *path; | |
837 | struct btrfs_root_item *ri; | |
838 | ||
839 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
840 | return 0; | |
841 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
842 | return 0; | |
843 | ||
844 | path = btrfs_alloc_path(); | |
845 | BUG_ON(!path); | |
846 | mutex_lock(&root->fs_info->fs_mutex); | |
847 | ||
58176a96 JB |
848 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
849 | dentry->d_name.name, | |
850 | dentry->d_name.len); | |
39279cc3 CM |
851 | if (IS_ERR(*sub_root)) |
852 | return PTR_ERR(*sub_root); | |
853 | ||
854 | ri = &(*sub_root)->root_item; | |
855 | location->objectid = btrfs_root_dirid(ri); | |
856 | location->flags = 0; | |
857 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
858 | location->offset = 0; | |
859 | ||
860 | btrfs_free_path(path); | |
861 | mutex_unlock(&root->fs_info->fs_mutex); | |
862 | return 0; | |
863 | } | |
864 | ||
865 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
866 | { | |
867 | struct btrfs_iget_args *args = p; | |
868 | inode->i_ino = args->ino; | |
869 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
870 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
871 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
872 | return 0; |
873 | } | |
874 | ||
875 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
876 | { | |
877 | struct btrfs_iget_args *args = opaque; | |
878 | return (args->ino == inode->i_ino && | |
879 | args->root == BTRFS_I(inode)->root); | |
880 | } | |
881 | ||
882 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
883 | struct btrfs_root *root) | |
884 | { | |
885 | struct inode *inode; | |
886 | struct btrfs_iget_args args; | |
887 | args.ino = objectid; | |
888 | args.root = root; | |
889 | ||
890 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
891 | btrfs_init_locked_inode, | |
892 | (void *)&args); | |
893 | return inode; | |
894 | } | |
895 | ||
896 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
897 | struct nameidata *nd) | |
898 | { | |
899 | struct inode * inode; | |
900 | struct btrfs_inode *bi = BTRFS_I(dir); | |
901 | struct btrfs_root *root = bi->root; | |
902 | struct btrfs_root *sub_root = root; | |
903 | struct btrfs_key location; | |
904 | int ret; | |
905 | ||
906 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
907 | return ERR_PTR(-ENAMETOOLONG); | |
908 | mutex_lock(&root->fs_info->fs_mutex); | |
909 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
910 | mutex_unlock(&root->fs_info->fs_mutex); | |
911 | if (ret < 0) | |
912 | return ERR_PTR(ret); | |
913 | inode = NULL; | |
914 | if (location.objectid) { | |
58176a96 JB |
915 | ret = fixup_tree_root_location(root, &location, &sub_root, |
916 | dentry); | |
39279cc3 CM |
917 | if (ret < 0) |
918 | return ERR_PTR(ret); | |
919 | if (ret > 0) | |
920 | return ERR_PTR(-ENOENT); | |
921 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
922 | sub_root); | |
923 | if (!inode) | |
924 | return ERR_PTR(-EACCES); | |
925 | if (inode->i_state & I_NEW) { | |
926 | /* the inode and parent dir are two different roots */ | |
927 | if (sub_root != root) { | |
928 | igrab(inode); | |
929 | sub_root->inode = inode; | |
930 | } | |
931 | BTRFS_I(inode)->root = sub_root; | |
932 | memcpy(&BTRFS_I(inode)->location, &location, | |
933 | sizeof(location)); | |
934 | btrfs_read_locked_inode(inode); | |
935 | unlock_new_inode(inode); | |
936 | } | |
937 | } | |
938 | return d_splice_alias(inode, dentry); | |
939 | } | |
940 | ||
39279cc3 CM |
941 | static unsigned char btrfs_filetype_table[] = { |
942 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
943 | }; | |
944 | ||
945 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
946 | { | |
947 | struct inode *inode = filp->f_path.dentry->d_inode; | |
948 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
949 | struct btrfs_item *item; | |
950 | struct btrfs_dir_item *di; | |
951 | struct btrfs_key key; | |
952 | struct btrfs_path *path; | |
953 | int ret; | |
954 | u32 nritems; | |
955 | struct btrfs_leaf *leaf; | |
956 | int slot; | |
957 | int advance; | |
958 | unsigned char d_type; | |
959 | int over = 0; | |
960 | u32 di_cur; | |
961 | u32 di_total; | |
962 | u32 di_len; | |
963 | int key_type = BTRFS_DIR_INDEX_KEY; | |
964 | ||
965 | /* FIXME, use a real flag for deciding about the key type */ | |
966 | if (root->fs_info->tree_root == root) | |
967 | key_type = BTRFS_DIR_ITEM_KEY; | |
968 | mutex_lock(&root->fs_info->fs_mutex); | |
969 | key.objectid = inode->i_ino; | |
970 | key.flags = 0; | |
971 | btrfs_set_key_type(&key, key_type); | |
972 | key.offset = filp->f_pos; | |
973 | path = btrfs_alloc_path(); | |
2cc58cf2 | 974 | path->reada = 2; |
39279cc3 CM |
975 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
976 | if (ret < 0) | |
977 | goto err; | |
978 | advance = 0; | |
39279cc3 CM |
979 | while(1) { |
980 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
981 | nritems = btrfs_header_nritems(&leaf->header); | |
982 | slot = path->slots[0]; | |
983 | if (advance || slot >= nritems) { | |
984 | if (slot >= nritems -1) { | |
39279cc3 CM |
985 | ret = btrfs_next_leaf(root, path); |
986 | if (ret) | |
987 | break; | |
988 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
989 | nritems = btrfs_header_nritems(&leaf->header); | |
990 | slot = path->slots[0]; | |
991 | } else { | |
992 | slot++; | |
993 | path->slots[0]++; | |
994 | } | |
995 | } | |
996 | advance = 1; | |
997 | item = leaf->items + slot; | |
998 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) | |
999 | break; | |
1000 | if (btrfs_disk_key_type(&item->key) != key_type) | |
1001 | break; | |
1002 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) | |
1003 | continue; | |
1004 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
1005 | advance = 1; | |
1006 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1007 | di_cur = 0; | |
1008 | di_total = btrfs_item_size(leaf->items + slot); | |
1009 | while(di_cur < di_total) { | |
1010 | d_type = btrfs_filetype_table[btrfs_dir_type(di)]; | |
1011 | over = filldir(dirent, (const char *)(di + 1), | |
1012 | btrfs_dir_name_len(di), | |
1013 | btrfs_disk_key_offset(&item->key), | |
1014 | btrfs_disk_key_objectid(&di->location), | |
1015 | d_type); | |
1016 | if (over) | |
1017 | goto nopos; | |
1018 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
1019 | di_cur += di_len; | |
1020 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1021 | } | |
1022 | } | |
1023 | filp->f_pos++; | |
1024 | nopos: | |
1025 | ret = 0; | |
1026 | err: | |
1027 | btrfs_release_path(root, path); | |
1028 | btrfs_free_path(path); | |
1029 | mutex_unlock(&root->fs_info->fs_mutex); | |
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | int btrfs_write_inode(struct inode *inode, int wait) | |
1034 | { | |
1035 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1036 | struct btrfs_trans_handle *trans; | |
1037 | int ret = 0; | |
1038 | ||
1039 | if (wait) { | |
1040 | mutex_lock(&root->fs_info->fs_mutex); | |
1041 | trans = btrfs_start_transaction(root, 1); | |
1042 | btrfs_set_trans_block_group(trans, inode); | |
1043 | ret = btrfs_commit_transaction(trans, root); | |
1044 | mutex_unlock(&root->fs_info->fs_mutex); | |
1045 | } | |
1046 | return ret; | |
1047 | } | |
1048 | ||
1049 | /* | |
54aa1f4d | 1050 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1051 | * inode changes. But, it is most likely to find the inode in cache. |
1052 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1053 | * to keep or drop this code. | |
1054 | */ | |
1055 | void btrfs_dirty_inode(struct inode *inode) | |
1056 | { | |
1057 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1058 | struct btrfs_trans_handle *trans; | |
1059 | ||
1060 | mutex_lock(&root->fs_info->fs_mutex); | |
1061 | trans = btrfs_start_transaction(root, 1); | |
1062 | btrfs_set_trans_block_group(trans, inode); | |
1063 | btrfs_update_inode(trans, root, inode); | |
1064 | btrfs_end_transaction(trans, root); | |
1065 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1066 | } |
1067 | ||
1068 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1069 | struct btrfs_root *root, | |
1070 | u64 objectid, | |
1071 | struct btrfs_block_group_cache *group, | |
1072 | int mode) | |
1073 | { | |
1074 | struct inode *inode; | |
1075 | struct btrfs_inode_item inode_item; | |
1076 | struct btrfs_key *location; | |
1077 | int ret; | |
1078 | int owner; | |
1079 | ||
1080 | inode = new_inode(root->fs_info->sb); | |
1081 | if (!inode) | |
1082 | return ERR_PTR(-ENOMEM); | |
1083 | ||
b888db2b CM |
1084 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1085 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1086 | BTRFS_I(inode)->root = root; |
b888db2b | 1087 | |
39279cc3 CM |
1088 | if (mode & S_IFDIR) |
1089 | owner = 0; | |
1090 | else | |
1091 | owner = 1; | |
1092 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1093 | BTRFS_I(inode)->block_group = group; | |
1094 | ||
1095 | inode->i_uid = current->fsuid; | |
1096 | inode->i_gid = current->fsgid; | |
1097 | inode->i_mode = mode; | |
1098 | inode->i_ino = objectid; | |
1099 | inode->i_blocks = 0; | |
1100 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1101 | fill_inode_item(&inode_item, inode); | |
1102 | location = &BTRFS_I(inode)->location; | |
1103 | location->objectid = objectid; | |
1104 | location->flags = 0; | |
1105 | location->offset = 0; | |
1106 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1107 | ||
1108 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
54aa1f4d CM |
1109 | if (ret) |
1110 | return ERR_PTR(ret); | |
39279cc3 CM |
1111 | insert_inode_hash(inode); |
1112 | return inode; | |
1113 | } | |
1114 | ||
1115 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1116 | { | |
1117 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1118 | } | |
1119 | ||
1120 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1121 | struct dentry *dentry, struct inode *inode) | |
1122 | { | |
1123 | int ret; | |
1124 | struct btrfs_key key; | |
1125 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1126 | struct inode *parent_inode; |
39279cc3 CM |
1127 | key.objectid = inode->i_ino; |
1128 | key.flags = 0; | |
1129 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1130 | key.offset = 0; | |
1131 | ||
1132 | ret = btrfs_insert_dir_item(trans, root, | |
1133 | dentry->d_name.name, dentry->d_name.len, | |
1134 | dentry->d_parent->d_inode->i_ino, | |
1135 | &key, btrfs_inode_type(inode)); | |
1136 | if (ret == 0) { | |
79c44584 CM |
1137 | parent_inode = dentry->d_parent->d_inode; |
1138 | parent_inode->i_size += dentry->d_name.len * 2; | |
1139 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1140 | ret = btrfs_update_inode(trans, root, |
1141 | dentry->d_parent->d_inode); | |
1142 | } | |
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1147 | struct dentry *dentry, struct inode *inode) | |
1148 | { | |
1149 | int err = btrfs_add_link(trans, dentry, inode); | |
1150 | if (!err) { | |
1151 | d_instantiate(dentry, inode); | |
1152 | return 0; | |
1153 | } | |
1154 | if (err > 0) | |
1155 | err = -EEXIST; | |
1156 | return err; | |
1157 | } | |
1158 | ||
618e21d5 JB |
1159 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1160 | int mode, dev_t rdev) | |
1161 | { | |
1162 | struct btrfs_trans_handle *trans; | |
1163 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1164 | struct inode *inode; | |
1165 | int err; | |
1166 | int drop_inode = 0; | |
1167 | u64 objectid; | |
1168 | ||
1169 | if (!new_valid_dev(rdev)) | |
1170 | return -EINVAL; | |
1171 | ||
1172 | mutex_lock(&root->fs_info->fs_mutex); | |
1173 | trans = btrfs_start_transaction(root, 1); | |
1174 | btrfs_set_trans_block_group(trans, dir); | |
1175 | ||
1176 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1177 | if (err) { | |
1178 | err = -ENOSPC; | |
1179 | goto out_unlock; | |
1180 | } | |
1181 | ||
1182 | inode = btrfs_new_inode(trans, root, objectid, | |
1183 | BTRFS_I(dir)->block_group, mode); | |
1184 | err = PTR_ERR(inode); | |
1185 | if (IS_ERR(inode)) | |
1186 | goto out_unlock; | |
1187 | ||
1188 | btrfs_set_trans_block_group(trans, inode); | |
1189 | err = btrfs_add_nondir(trans, dentry, inode); | |
1190 | if (err) | |
1191 | drop_inode = 1; | |
1192 | else { | |
1193 | inode->i_op = &btrfs_special_inode_operations; | |
1194 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1195 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1196 | } |
1197 | dir->i_sb->s_dirt = 1; | |
1198 | btrfs_update_inode_block_group(trans, inode); | |
1199 | btrfs_update_inode_block_group(trans, dir); | |
1200 | out_unlock: | |
1201 | btrfs_end_transaction(trans, root); | |
1202 | mutex_unlock(&root->fs_info->fs_mutex); | |
1203 | ||
1204 | if (drop_inode) { | |
1205 | inode_dec_link_count(inode); | |
1206 | iput(inode); | |
1207 | } | |
1208 | btrfs_btree_balance_dirty(root); | |
1209 | return err; | |
1210 | } | |
1211 | ||
39279cc3 CM |
1212 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1213 | int mode, struct nameidata *nd) | |
1214 | { | |
1215 | struct btrfs_trans_handle *trans; | |
1216 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1217 | struct inode *inode; | |
1218 | int err; | |
1219 | int drop_inode = 0; | |
1220 | u64 objectid; | |
1221 | ||
1222 | mutex_lock(&root->fs_info->fs_mutex); | |
1223 | trans = btrfs_start_transaction(root, 1); | |
1224 | btrfs_set_trans_block_group(trans, dir); | |
1225 | ||
1226 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1227 | if (err) { | |
1228 | err = -ENOSPC; | |
1229 | goto out_unlock; | |
1230 | } | |
1231 | ||
1232 | inode = btrfs_new_inode(trans, root, objectid, | |
1233 | BTRFS_I(dir)->block_group, mode); | |
1234 | err = PTR_ERR(inode); | |
1235 | if (IS_ERR(inode)) | |
1236 | goto out_unlock; | |
1237 | ||
1238 | btrfs_set_trans_block_group(trans, inode); | |
1239 | err = btrfs_add_nondir(trans, dentry, inode); | |
1240 | if (err) | |
1241 | drop_inode = 1; | |
1242 | else { | |
1243 | inode->i_mapping->a_ops = &btrfs_aops; | |
1244 | inode->i_fop = &btrfs_file_operations; | |
1245 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1246 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1247 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1248 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1249 | } |
1250 | dir->i_sb->s_dirt = 1; | |
1251 | btrfs_update_inode_block_group(trans, inode); | |
1252 | btrfs_update_inode_block_group(trans, dir); | |
1253 | out_unlock: | |
1254 | btrfs_end_transaction(trans, root); | |
1255 | mutex_unlock(&root->fs_info->fs_mutex); | |
1256 | ||
1257 | if (drop_inode) { | |
1258 | inode_dec_link_count(inode); | |
1259 | iput(inode); | |
1260 | } | |
1261 | btrfs_btree_balance_dirty(root); | |
1262 | return err; | |
1263 | } | |
1264 | ||
1265 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1266 | struct dentry *dentry) | |
1267 | { | |
1268 | struct btrfs_trans_handle *trans; | |
1269 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1270 | struct inode *inode = old_dentry->d_inode; | |
1271 | int err; | |
1272 | int drop_inode = 0; | |
1273 | ||
1274 | if (inode->i_nlink == 0) | |
1275 | return -ENOENT; | |
1276 | ||
1277 | inc_nlink(inode); | |
1278 | mutex_lock(&root->fs_info->fs_mutex); | |
1279 | trans = btrfs_start_transaction(root, 1); | |
1280 | btrfs_set_trans_block_group(trans, dir); | |
1281 | atomic_inc(&inode->i_count); | |
1282 | err = btrfs_add_nondir(trans, dentry, inode); | |
1283 | if (err) | |
1284 | drop_inode = 1; | |
1285 | dir->i_sb->s_dirt = 1; | |
1286 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d CM |
1287 | err = btrfs_update_inode(trans, root, inode); |
1288 | if (err) | |
1289 | drop_inode = 1; | |
39279cc3 CM |
1290 | |
1291 | btrfs_end_transaction(trans, root); | |
1292 | mutex_unlock(&root->fs_info->fs_mutex); | |
1293 | ||
1294 | if (drop_inode) { | |
1295 | inode_dec_link_count(inode); | |
1296 | iput(inode); | |
1297 | } | |
1298 | btrfs_btree_balance_dirty(root); | |
1299 | return err; | |
1300 | } | |
1301 | ||
1302 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
1303 | struct btrfs_root *root, | |
1304 | u64 objectid, u64 dirid) | |
1305 | { | |
1306 | int ret; | |
1307 | char buf[2]; | |
1308 | struct btrfs_key key; | |
1309 | ||
1310 | buf[0] = '.'; | |
1311 | buf[1] = '.'; | |
1312 | ||
1313 | key.objectid = objectid; | |
1314 | key.offset = 0; | |
1315 | key.flags = 0; | |
1316 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
1317 | ||
1318 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, | |
1319 | &key, BTRFS_FT_DIR); | |
1320 | if (ret) | |
1321 | goto error; | |
1322 | key.objectid = dirid; | |
1323 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
1324 | &key, BTRFS_FT_DIR); | |
1325 | if (ret) | |
1326 | goto error; | |
1327 | error: | |
1328 | return ret; | |
1329 | } | |
1330 | ||
1331 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1332 | { | |
1333 | struct inode *inode; | |
1334 | struct btrfs_trans_handle *trans; | |
1335 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1336 | int err = 0; | |
1337 | int drop_on_err = 0; | |
1338 | u64 objectid; | |
1339 | ||
1340 | mutex_lock(&root->fs_info->fs_mutex); | |
1341 | trans = btrfs_start_transaction(root, 1); | |
1342 | btrfs_set_trans_block_group(trans, dir); | |
1343 | if (IS_ERR(trans)) { | |
1344 | err = PTR_ERR(trans); | |
1345 | goto out_unlock; | |
1346 | } | |
1347 | ||
1348 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1349 | if (err) { | |
1350 | err = -ENOSPC; | |
1351 | goto out_unlock; | |
1352 | } | |
1353 | ||
1354 | inode = btrfs_new_inode(trans, root, objectid, | |
1355 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1356 | if (IS_ERR(inode)) { | |
1357 | err = PTR_ERR(inode); | |
1358 | goto out_fail; | |
1359 | } | |
1360 | drop_on_err = 1; | |
1361 | inode->i_op = &btrfs_dir_inode_operations; | |
1362 | inode->i_fop = &btrfs_dir_file_operations; | |
1363 | btrfs_set_trans_block_group(trans, inode); | |
1364 | ||
1365 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); | |
1366 | if (err) | |
1367 | goto out_fail; | |
1368 | ||
1369 | inode->i_size = 6; | |
1370 | err = btrfs_update_inode(trans, root, inode); | |
1371 | if (err) | |
1372 | goto out_fail; | |
1373 | err = btrfs_add_link(trans, dentry, inode); | |
1374 | if (err) | |
1375 | goto out_fail; | |
1376 | d_instantiate(dentry, inode); | |
1377 | drop_on_err = 0; | |
1378 | dir->i_sb->s_dirt = 1; | |
1379 | btrfs_update_inode_block_group(trans, inode); | |
1380 | btrfs_update_inode_block_group(trans, dir); | |
1381 | ||
1382 | out_fail: | |
1383 | btrfs_end_transaction(trans, root); | |
1384 | out_unlock: | |
1385 | mutex_unlock(&root->fs_info->fs_mutex); | |
1386 | if (drop_on_err) | |
1387 | iput(inode); | |
1388 | btrfs_btree_balance_dirty(root); | |
1389 | return err; | |
1390 | } | |
1391 | ||
a52d9a80 CM |
1392 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1393 | size_t page_offset, u64 start, u64 end, | |
1394 | int create) | |
1395 | { | |
1396 | int ret; | |
1397 | int err = 0; | |
1398 | u64 blocknr; | |
1399 | u64 extent_start = 0; | |
1400 | u64 extent_end = 0; | |
1401 | u64 objectid = inode->i_ino; | |
1402 | u32 found_type; | |
1403 | int failed_insert = 0; | |
1404 | struct btrfs_path *path; | |
1405 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1406 | struct btrfs_file_extent_item *item; | |
1407 | struct btrfs_leaf *leaf; | |
1408 | struct btrfs_disk_key *found_key; | |
1409 | struct extent_map *em = NULL; | |
1410 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1411 | struct btrfs_trans_handle *trans = NULL; | |
1412 | ||
1413 | path = btrfs_alloc_path(); | |
1414 | BUG_ON(!path); | |
1415 | mutex_lock(&root->fs_info->fs_mutex); | |
1416 | ||
1417 | again: | |
1418 | em = lookup_extent_mapping(em_tree, start, end); | |
1419 | if (em) { | |
1420 | goto out; | |
1421 | } | |
1422 | if (!em) { | |
1423 | em = alloc_extent_map(GFP_NOFS); | |
1424 | if (!em) { | |
1425 | err = -ENOMEM; | |
1426 | goto out; | |
1427 | } | |
1428 | em->start = 0; | |
1429 | em->end = 0; | |
1430 | } | |
1431 | em->bdev = inode->i_sb->s_bdev; | |
1432 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
1433 | objectid, start, 0); | |
1434 | if (ret < 0) { | |
1435 | err = ret; | |
1436 | goto out; | |
1437 | } | |
1438 | ||
1439 | if (ret != 0) { | |
1440 | if (path->slots[0] == 0) | |
1441 | goto not_found; | |
1442 | path->slots[0]--; | |
1443 | } | |
1444 | ||
1445 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], | |
1446 | struct btrfs_file_extent_item); | |
1447 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1448 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
1449 | blocknr += btrfs_file_extent_offset(item); | |
1450 | ||
1451 | /* are we inside the extent that was found? */ | |
1452 | found_key = &leaf->items[path->slots[0]].key; | |
1453 | found_type = btrfs_disk_key_type(found_key); | |
1454 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
1455 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
1456 | goto not_found; | |
1457 | } | |
1458 | ||
1459 | found_type = btrfs_file_extent_type(item); | |
1460 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1461 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1462 | extent_end = extent_start + | |
1463 | (btrfs_file_extent_num_blocks(item) << inode->i_blkbits); | |
1464 | err = 0; | |
b888db2b | 1465 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1466 | em->start = start; |
1467 | if (start < extent_start) { | |
b888db2b CM |
1468 | if (end < extent_start) |
1469 | goto not_found; | |
a52d9a80 CM |
1470 | em->end = extent_end - 1; |
1471 | } else { | |
1472 | em->end = end; | |
1473 | } | |
1474 | goto not_found_em; | |
1475 | } | |
1476 | if (btrfs_file_extent_disk_blocknr(item) == 0) { | |
1477 | em->start = extent_start; | |
1478 | em->end = extent_end - 1; | |
1479 | em->block_start = 0; | |
1480 | em->block_end = 0; | |
1481 | goto insert; | |
1482 | } | |
1483 | em->block_start = blocknr << inode->i_blkbits; | |
1484 | em->block_end = em->block_start + | |
1485 | (btrfs_file_extent_num_blocks(item) << | |
1486 | inode->i_blkbits) - 1; | |
1487 | em->start = extent_start; | |
1488 | em->end = extent_end - 1; | |
1489 | goto insert; | |
1490 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1491 | char *ptr; | |
1492 | char *map; | |
1493 | u32 size; | |
1494 | ||
1495 | size = btrfs_file_extent_inline_len(leaf->items + | |
1496 | path->slots[0]); | |
1497 | extent_end = extent_start + size; | |
b888db2b | 1498 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1499 | em->start = start; |
1500 | if (start < extent_start) { | |
b888db2b CM |
1501 | if (end < extent_start) |
1502 | goto not_found; | |
a52d9a80 CM |
1503 | em->end = extent_end - 1; |
1504 | } else { | |
1505 | em->end = end; | |
1506 | } | |
1507 | goto not_found_em; | |
1508 | } | |
1509 | em->block_start = EXTENT_MAP_INLINE; | |
1510 | em->block_end = EXTENT_MAP_INLINE; | |
1511 | em->start = extent_start; | |
1512 | em->end = extent_end - 1; | |
1513 | if (!page) { | |
1514 | goto insert; | |
1515 | } | |
1516 | ptr = btrfs_file_extent_inline_start(item); | |
1517 | map = kmap(page); | |
1518 | memcpy(map + page_offset, ptr, size); | |
1519 | flush_dcache_page(result->b_page); | |
1520 | kunmap(page); | |
1521 | set_extent_uptodate(em_tree, extent_start, | |
1522 | extent_end, GFP_NOFS); | |
1523 | goto insert; | |
1524 | } else { | |
1525 | printk("unkknown found_type %d\n", found_type); | |
1526 | WARN_ON(1); | |
1527 | } | |
1528 | not_found: | |
1529 | em->start = start; | |
1530 | em->end = end; | |
1531 | not_found_em: | |
1532 | em->block_start = 0; | |
1533 | em->block_end = 0; | |
1534 | insert: | |
1535 | btrfs_release_path(root, path); | |
1536 | if (em->start > start || em->end < start) { | |
b888db2b | 1537 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1538 | err = -EIO; |
1539 | goto out; | |
1540 | } | |
1541 | ret = add_extent_mapping(em_tree, em); | |
1542 | if (ret == -EEXIST) { | |
1543 | free_extent_map(em); | |
2bf5a725 | 1544 | em = NULL; |
a52d9a80 CM |
1545 | failed_insert++; |
1546 | if (failed_insert > 5) { | |
1547 | printk("failing to insert %Lu %Lu\n", start, end); | |
1548 | err = -EIO; | |
1549 | goto out; | |
1550 | } | |
a52d9a80 CM |
1551 | goto again; |
1552 | } | |
1553 | err = 0; | |
1554 | out: | |
1555 | btrfs_free_path(path); | |
1556 | if (trans) { | |
1557 | ret = btrfs_end_transaction(trans, root); | |
1558 | if (!err) | |
1559 | err = ret; | |
1560 | } | |
1561 | mutex_unlock(&root->fs_info->fs_mutex); | |
1562 | if (err) { | |
1563 | free_extent_map(em); | |
1564 | WARN_ON(1); | |
1565 | return ERR_PTR(err); | |
1566 | } | |
1567 | return em; | |
1568 | } | |
1569 | ||
d396c6f5 | 1570 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1571 | { |
d396c6f5 | 1572 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1573 | } |
1574 | ||
1575 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1576 | unsigned from, unsigned to) | |
1577 | { | |
a52d9a80 CM |
1578 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1579 | page->mapping->host, page, from, to, | |
1580 | btrfs_get_extent); | |
39279cc3 CM |
1581 | } |
1582 | ||
a52d9a80 | 1583 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1584 | { |
a52d9a80 CM |
1585 | struct extent_map_tree *tree; |
1586 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1587 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1588 | } |
a52d9a80 | 1589 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1590 | { |
a52d9a80 | 1591 | struct extent_map_tree *tree; |
b888db2b CM |
1592 | |
1593 | ||
1594 | if (current->flags & PF_MEMALLOC) { | |
1595 | redirty_page_for_writepage(wbc, page); | |
1596 | unlock_page(page); | |
1597 | return 0; | |
1598 | } | |
a52d9a80 CM |
1599 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1600 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1601 | } |
1602 | ||
a52d9a80 | 1603 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1604 | { |
a52d9a80 CM |
1605 | struct extent_map_tree *tree; |
1606 | int ret; | |
8c2383c3 | 1607 | |
a52d9a80 CM |
1608 | if (page->private != 1) { |
1609 | WARN_ON(1); | |
1610 | return try_to_free_buffers(page); | |
39279cc3 | 1611 | } |
a52d9a80 CM |
1612 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1613 | ret = try_release_extent_mapping(tree, page); | |
1614 | if (ret == 1) { | |
1615 | ClearPagePrivate(page); | |
1616 | set_page_private(page, 0); | |
1617 | page_cache_release(page); | |
39279cc3 | 1618 | } |
a52d9a80 | 1619 | return ret; |
39279cc3 CM |
1620 | } |
1621 | ||
a52d9a80 | 1622 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1623 | { |
a52d9a80 | 1624 | struct extent_map_tree *tree; |
39279cc3 | 1625 | |
a52d9a80 CM |
1626 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1627 | extent_invalidatepage(tree, page, offset); | |
1628 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1629 | } |
1630 | ||
9ebefb18 CM |
1631 | /* |
1632 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1633 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1634 | * be careful to check for EOF conditions here. We set the page up correctly | |
1635 | * for a written page which means we get ENOSPC checking when writing into | |
1636 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1637 | * support these features. | |
1638 | * | |
1639 | * We are not allowed to take the i_mutex here so we have to play games to | |
1640 | * protect against truncate races as the page could now be beyond EOF. Because | |
1641 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1642 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1643 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1644 | * unlock the page. | |
1645 | */ | |
1646 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1647 | { | |
1648 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1649 | unsigned long end; | |
1650 | loff_t size; | |
1651 | int ret = -EINVAL; | |
a52d9a80 | 1652 | u64 page_start; |
9ebefb18 | 1653 | |
011410bd | 1654 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1655 | lock_page(page); |
1656 | wait_on_page_writeback(page); | |
9ebefb18 | 1657 | size = i_size_read(inode); |
a52d9a80 CM |
1658 | page_start = page->index << PAGE_CACHE_SHIFT; |
1659 | ||
9ebefb18 | 1660 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1661 | (page_start > size)) { |
9ebefb18 CM |
1662 | /* page got truncated out from underneath us */ |
1663 | goto out_unlock; | |
1664 | } | |
1665 | ||
1666 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1667 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1668 | end = size & ~PAGE_CACHE_MASK; |
1669 | else | |
1670 | end = PAGE_CACHE_SIZE; | |
1671 | ||
b888db2b | 1672 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1673 | |
1674 | out_unlock: | |
011410bd | 1675 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1676 | unlock_page(page); |
1677 | return ret; | |
1678 | } | |
1679 | ||
39279cc3 CM |
1680 | static void btrfs_truncate(struct inode *inode) |
1681 | { | |
1682 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1683 | int ret; | |
1684 | struct btrfs_trans_handle *trans; | |
1685 | ||
1686 | if (!S_ISREG(inode->i_mode)) | |
1687 | return; | |
1688 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1689 | return; | |
1690 | ||
1691 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1692 | ||
1693 | mutex_lock(&root->fs_info->fs_mutex); | |
1694 | trans = btrfs_start_transaction(root, 1); | |
1695 | btrfs_set_trans_block_group(trans, inode); | |
1696 | ||
1697 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1698 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 CM |
1699 | btrfs_update_inode(trans, root, inode); |
1700 | ret = btrfs_end_transaction(trans, root); | |
1701 | BUG_ON(ret); | |
1702 | mutex_unlock(&root->fs_info->fs_mutex); | |
1703 | btrfs_btree_balance_dirty(root); | |
1704 | } | |
1705 | ||
1706 | int btrfs_commit_write(struct file *file, struct page *page, | |
1707 | unsigned from, unsigned to) | |
1708 | { | |
a52d9a80 CM |
1709 | return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1710 | page->mapping->host, page, from, to); | |
39279cc3 CM |
1711 | } |
1712 | ||
1713 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1714 | { | |
1715 | struct btrfs_trans_handle *trans; | |
1716 | struct btrfs_key key; | |
1717 | struct btrfs_root_item root_item; | |
1718 | struct btrfs_inode_item *inode_item; | |
1719 | struct buffer_head *subvol; | |
1720 | struct btrfs_leaf *leaf; | |
1721 | struct btrfs_root *new_root; | |
1722 | struct inode *inode; | |
1723 | struct inode *dir; | |
1724 | int ret; | |
54aa1f4d | 1725 | int err; |
39279cc3 CM |
1726 | u64 objectid; |
1727 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
1728 | ||
1729 | mutex_lock(&root->fs_info->fs_mutex); | |
1730 | trans = btrfs_start_transaction(root, 1); | |
1731 | BUG_ON(!trans); | |
1732 | ||
6702ed49 | 1733 | subvol = btrfs_alloc_free_block(trans, root, 0, 0); |
54aa1f4d CM |
1734 | if (IS_ERR(subvol)) |
1735 | return PTR_ERR(subvol); | |
39279cc3 CM |
1736 | leaf = btrfs_buffer_leaf(subvol); |
1737 | btrfs_set_header_nritems(&leaf->header, 0); | |
1738 | btrfs_set_header_level(&leaf->header, 0); | |
1739 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); | |
1740 | btrfs_set_header_generation(&leaf->header, trans->transid); | |
1741 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); | |
1742 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, | |
1743 | sizeof(leaf->header.fsid)); | |
ccd467d6 | 1744 | btrfs_mark_buffer_dirty(subvol); |
39279cc3 CM |
1745 | |
1746 | inode_item = &root_item.inode; | |
1747 | memset(inode_item, 0, sizeof(*inode_item)); | |
1748 | btrfs_set_inode_generation(inode_item, 1); | |
1749 | btrfs_set_inode_size(inode_item, 3); | |
1750 | btrfs_set_inode_nlink(inode_item, 1); | |
1751 | btrfs_set_inode_nblocks(inode_item, 1); | |
1752 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
1753 | ||
1754 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); | |
1755 | btrfs_set_root_refs(&root_item, 1); | |
58176a96 | 1756 | btrfs_set_root_blocks_used(&root_item, 0); |
5eda7b5e CM |
1757 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1758 | root_item.drop_level = 0; | |
39279cc3 CM |
1759 | brelse(subvol); |
1760 | subvol = NULL; | |
1761 | ||
1762 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1763 | 0, &objectid); | |
54aa1f4d CM |
1764 | if (ret) |
1765 | goto fail; | |
39279cc3 CM |
1766 | |
1767 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1768 | ||
1769 | key.objectid = objectid; | |
1770 | key.offset = 1; | |
1771 | key.flags = 0; | |
1772 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
1773 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1774 | &root_item); | |
54aa1f4d CM |
1775 | if (ret) |
1776 | goto fail; | |
39279cc3 CM |
1777 | |
1778 | /* | |
1779 | * insert the directory item | |
1780 | */ | |
1781 | key.offset = (u64)-1; | |
1782 | dir = root->fs_info->sb->s_root->d_inode; | |
1783 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1784 | name, namelen, dir->i_ino, &key, | |
1785 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1786 | if (ret) |
1787 | goto fail; | |
39279cc3 CM |
1788 | |
1789 | ret = btrfs_commit_transaction(trans, root); | |
54aa1f4d CM |
1790 | if (ret) |
1791 | goto fail_commit; | |
39279cc3 | 1792 | |
58176a96 | 1793 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
1794 | BUG_ON(!new_root); |
1795 | ||
1796 | trans = btrfs_start_transaction(new_root, 1); | |
1797 | BUG_ON(!trans); | |
1798 | ||
1799 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
1800 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
1801 | if (IS_ERR(inode)) |
1802 | goto fail; | |
39279cc3 CM |
1803 | inode->i_op = &btrfs_dir_inode_operations; |
1804 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 1805 | new_root->inode = inode; |
39279cc3 CM |
1806 | |
1807 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
54aa1f4d CM |
1808 | if (ret) |
1809 | goto fail; | |
39279cc3 CM |
1810 | |
1811 | inode->i_nlink = 1; | |
1812 | inode->i_size = 6; | |
1813 | ret = btrfs_update_inode(trans, new_root, inode); | |
54aa1f4d CM |
1814 | if (ret) |
1815 | goto fail; | |
1816 | fail: | |
1817 | err = btrfs_commit_transaction(trans, root); | |
1818 | if (err && !ret) | |
1819 | ret = err; | |
1820 | fail_commit: | |
39279cc3 CM |
1821 | mutex_unlock(&root->fs_info->fs_mutex); |
1822 | btrfs_btree_balance_dirty(root); | |
54aa1f4d | 1823 | return ret; |
39279cc3 CM |
1824 | } |
1825 | ||
1826 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
1827 | { | |
1828 | struct btrfs_trans_handle *trans; | |
1829 | struct btrfs_key key; | |
1830 | struct btrfs_root_item new_root_item; | |
83df7c1d | 1831 | struct buffer_head *tmp; |
39279cc3 | 1832 | int ret; |
54aa1f4d | 1833 | int err; |
39279cc3 CM |
1834 | u64 objectid; |
1835 | ||
1836 | if (!root->ref_cows) | |
1837 | return -EINVAL; | |
1838 | ||
011410bd CM |
1839 | down_write(&root->snap_sem); |
1840 | freeze_bdev(root->fs_info->sb->s_bdev); | |
1841 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
1842 | ||
39279cc3 CM |
1843 | mutex_lock(&root->fs_info->fs_mutex); |
1844 | trans = btrfs_start_transaction(root, 1); | |
1845 | BUG_ON(!trans); | |
1846 | ||
1847 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
1848 | if (ret) |
1849 | goto fail; | |
39279cc3 CM |
1850 | |
1851 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1852 | 0, &objectid); | |
54aa1f4d CM |
1853 | if (ret) |
1854 | goto fail; | |
39279cc3 CM |
1855 | |
1856 | memcpy(&new_root_item, &root->root_item, | |
1857 | sizeof(new_root_item)); | |
1858 | ||
1859 | key.objectid = objectid; | |
1860 | key.offset = 1; | |
1861 | key.flags = 0; | |
1862 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
83df7c1d | 1863 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
39279cc3 CM |
1864 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
1865 | ||
1866 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1867 | &new_root_item); | |
54aa1f4d CM |
1868 | if (ret) |
1869 | goto fail; | |
39279cc3 CM |
1870 | |
1871 | /* | |
1872 | * insert the directory item | |
1873 | */ | |
1874 | key.offset = (u64)-1; | |
1875 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1876 | name, namelen, | |
1877 | root->fs_info->sb->s_root->d_inode->i_ino, | |
1878 | &key, BTRFS_FT_DIR); | |
1879 | ||
54aa1f4d CM |
1880 | if (ret) |
1881 | goto fail; | |
39279cc3 CM |
1882 | |
1883 | ret = btrfs_inc_root_ref(trans, root); | |
54aa1f4d CM |
1884 | if (ret) |
1885 | goto fail; | |
54aa1f4d CM |
1886 | fail: |
1887 | err = btrfs_commit_transaction(trans, root); | |
1888 | if (err && !ret) | |
1889 | ret = err; | |
39279cc3 | 1890 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 1891 | up_write(&root->snap_sem); |
39279cc3 | 1892 | btrfs_btree_balance_dirty(root); |
54aa1f4d | 1893 | return ret; |
39279cc3 CM |
1894 | } |
1895 | ||
86479a04 CM |
1896 | static unsigned long force_ra(struct address_space *mapping, |
1897 | struct file_ra_state *ra, struct file *file, | |
1898 | pgoff_t offset, pgoff_t last_index) | |
1899 | { | |
1900 | pgoff_t req_size; | |
1901 | ||
1902 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
1903 | req_size = last_index - offset + 1; | |
1904 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
1905 | return offset; | |
1906 | #else | |
1907 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
1908 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
1909 | return offset + req_size; | |
1910 | #endif | |
1911 | } | |
1912 | ||
1913 | int btrfs_defrag_file(struct file *file) { | |
1914 | struct inode *inode = file->f_path.dentry->d_inode; | |
1915 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1916 | struct page *page; | |
1917 | unsigned long last_index; | |
1918 | unsigned long ra_index = 0; | |
1919 | u64 page_start; | |
1920 | u64 page_end; | |
1921 | unsigned long i; | |
1922 | ||
1923 | mutex_lock(&inode->i_mutex); | |
1924 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
1925 | for (i = 0; i <= last_index; i++) { | |
1926 | if (i == ra_index) { | |
1927 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
1928 | file, ra_index, last_index); | |
1929 | } | |
1930 | page = grab_cache_page(inode->i_mapping, i); | |
1931 | if (!page) | |
1932 | goto out_unlock; | |
1933 | if (!PageUptodate(page)) { | |
1934 | btrfs_readpage(NULL, page); | |
1935 | lock_page(page); | |
1936 | if (!PageUptodate(page)) { | |
1937 | unlock_page(page); | |
1938 | page_cache_release(page); | |
1939 | goto out_unlock; | |
1940 | } | |
1941 | } | |
1942 | page_start = page->index << PAGE_CACHE_SHIFT; | |
1943 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1944 | ||
1945 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
1946 | set_extent_delalloc(em_tree, page_start, | |
1947 | page_end, GFP_NOFS); | |
1948 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
1949 | set_page_dirty(page); | |
1950 | unlock_page(page); | |
1951 | page_cache_release(page); | |
1952 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
1953 | } | |
1954 | ||
1955 | out_unlock: | |
1956 | mutex_unlock(&inode->i_mutex); | |
1957 | return 0; | |
1958 | } | |
1959 | ||
39279cc3 CM |
1960 | int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
1961 | cmd, unsigned long arg) | |
1962 | { | |
1963 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1964 | struct btrfs_ioctl_vol_args vol_args; | |
1965 | int ret = 0; | |
1966 | struct btrfs_dir_item *di; | |
1967 | int namelen; | |
1968 | struct btrfs_path *path; | |
1969 | u64 root_dirid; | |
1970 | ||
1971 | switch (cmd) { | |
1972 | case BTRFS_IOC_SNAP_CREATE: | |
1973 | if (copy_from_user(&vol_args, | |
1974 | (struct btrfs_ioctl_vol_args __user *)arg, | |
1975 | sizeof(vol_args))) | |
1976 | return -EFAULT; | |
1977 | namelen = strlen(vol_args.name); | |
1978 | if (namelen > BTRFS_VOL_NAME_MAX) | |
1979 | return -EINVAL; | |
8a712645 CM |
1980 | if (strchr(vol_args.name, '/')) |
1981 | return -EINVAL; | |
39279cc3 CM |
1982 | path = btrfs_alloc_path(); |
1983 | if (!path) | |
1984 | return -ENOMEM; | |
1985 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
1986 | mutex_lock(&root->fs_info->fs_mutex); | |
1987 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
1988 | path, root_dirid, | |
1989 | vol_args.name, namelen, 0); | |
1990 | mutex_unlock(&root->fs_info->fs_mutex); | |
1991 | btrfs_free_path(path); | |
1992 | if (di && !IS_ERR(di)) | |
1993 | return -EEXIST; | |
54aa1f4d CM |
1994 | if (IS_ERR(di)) |
1995 | return PTR_ERR(di); | |
39279cc3 CM |
1996 | |
1997 | if (root == root->fs_info->tree_root) | |
1998 | ret = create_subvol(root, vol_args.name, namelen); | |
1999 | else | |
2000 | ret = create_snapshot(root, vol_args.name, namelen); | |
39279cc3 | 2001 | break; |
6702ed49 CM |
2002 | |
2003 | case BTRFS_IOC_DEFRAG: | |
86479a04 CM |
2004 | if (S_ISDIR(inode->i_mode)) { |
2005 | mutex_lock(&root->fs_info->fs_mutex); | |
2006 | btrfs_defrag_root(root, 0); | |
2007 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
2008 | mutex_unlock(&root->fs_info->fs_mutex); | |
2009 | } else if (S_ISREG(inode->i_mode)) { | |
2010 | btrfs_defrag_file(filp); | |
2011 | } | |
6702ed49 CM |
2012 | ret = 0; |
2013 | break; | |
39279cc3 CM |
2014 | default: |
2015 | return -ENOTTY; | |
2016 | } | |
2017 | return ret; | |
2018 | } | |
2019 | ||
2020 | #ifdef CONFIG_COMPAT | |
2021 | long btrfs_compat_ioctl(struct file *file, unsigned int cmd, | |
2022 | unsigned long arg) | |
2023 | { | |
2024 | struct inode *inode = file->f_path.dentry->d_inode; | |
2025 | int ret; | |
2026 | lock_kernel(); | |
2027 | ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
2028 | unlock_kernel(); | |
2029 | return ret; | |
2030 | ||
2031 | } | |
2032 | #endif | |
2033 | ||
2034 | /* | |
2035 | * Called inside transaction, so use GFP_NOFS | |
2036 | */ | |
2037 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2038 | { | |
2039 | struct btrfs_inode *ei; | |
2040 | ||
2041 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2042 | if (!ei) | |
2043 | return NULL; | |
15ee9bc7 | 2044 | ei->last_trans = 0; |
39279cc3 CM |
2045 | return &ei->vfs_inode; |
2046 | } | |
2047 | ||
2048 | void btrfs_destroy_inode(struct inode *inode) | |
2049 | { | |
2050 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2051 | WARN_ON(inode->i_data.nrpages); | |
2052 | ||
2053 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2054 | } | |
2055 | ||
2056 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2057 | unsigned long flags) | |
2058 | { | |
2059 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2060 | ||
2061 | inode_init_once(&ei->vfs_inode); | |
2062 | } | |
2063 | ||
2064 | void btrfs_destroy_cachep(void) | |
2065 | { | |
2066 | if (btrfs_inode_cachep) | |
2067 | kmem_cache_destroy(btrfs_inode_cachep); | |
2068 | if (btrfs_trans_handle_cachep) | |
2069 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2070 | if (btrfs_transaction_cachep) | |
2071 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2072 | if (btrfs_bit_radix_cachep) | |
2073 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2074 | if (btrfs_path_cachep) | |
2075 | kmem_cache_destroy(btrfs_path_cachep); | |
2076 | } | |
2077 | ||
86479a04 | 2078 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d CM |
2079 | unsigned long extra_flags, |
2080 | void (*ctor)(void *, struct kmem_cache *, | |
2081 | unsigned long)) | |
2082 | { | |
2083 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2084 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2085 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2086 | ,NULL | |
2087 | #endif | |
2088 | ); | |
2089 | } | |
2090 | ||
39279cc3 CM |
2091 | int btrfs_init_cachep(void) |
2092 | { | |
86479a04 | 2093 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2094 | sizeof(struct btrfs_inode), |
2095 | 0, init_once); | |
39279cc3 CM |
2096 | if (!btrfs_inode_cachep) |
2097 | goto fail; | |
86479a04 CM |
2098 | btrfs_trans_handle_cachep = |
2099 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2100 | sizeof(struct btrfs_trans_handle), | |
2101 | 0, NULL); | |
39279cc3 CM |
2102 | if (!btrfs_trans_handle_cachep) |
2103 | goto fail; | |
86479a04 | 2104 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2105 | sizeof(struct btrfs_transaction), |
92fee66d | 2106 | 0, NULL); |
39279cc3 CM |
2107 | if (!btrfs_transaction_cachep) |
2108 | goto fail; | |
86479a04 | 2109 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
92fee66d CM |
2110 | sizeof(struct btrfs_transaction), |
2111 | 0, NULL); | |
39279cc3 CM |
2112 | if (!btrfs_path_cachep) |
2113 | goto fail; | |
86479a04 | 2114 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2115 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2116 | if (!btrfs_bit_radix_cachep) |
2117 | goto fail; | |
2118 | return 0; | |
2119 | fail: | |
2120 | btrfs_destroy_cachep(); | |
2121 | return -ENOMEM; | |
2122 | } | |
2123 | ||
2124 | static int btrfs_getattr(struct vfsmount *mnt, | |
2125 | struct dentry *dentry, struct kstat *stat) | |
2126 | { | |
2127 | struct inode *inode = dentry->d_inode; | |
2128 | generic_fillattr(inode, stat); | |
2129 | stat->blksize = 256 * 1024; | |
2130 | return 0; | |
2131 | } | |
2132 | ||
2133 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2134 | struct inode * new_dir,struct dentry *new_dentry) | |
2135 | { | |
2136 | struct btrfs_trans_handle *trans; | |
2137 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2138 | struct inode *new_inode = new_dentry->d_inode; | |
2139 | struct inode *old_inode = old_dentry->d_inode; | |
2140 | struct timespec ctime = CURRENT_TIME; | |
2141 | struct btrfs_path *path; | |
2142 | struct btrfs_dir_item *di; | |
2143 | int ret; | |
2144 | ||
2145 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2146 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2147 | return -ENOTEMPTY; | |
2148 | } | |
2149 | mutex_lock(&root->fs_info->fs_mutex); | |
2150 | trans = btrfs_start_transaction(root, 1); | |
2151 | btrfs_set_trans_block_group(trans, new_dir); | |
2152 | path = btrfs_alloc_path(); | |
2153 | if (!path) { | |
2154 | ret = -ENOMEM; | |
2155 | goto out_fail; | |
2156 | } | |
2157 | ||
2158 | old_dentry->d_inode->i_nlink++; | |
2159 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2160 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2161 | old_inode->i_ctime = ctime; | |
2162 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { | |
2163 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
2164 | u64 old_parent_oid; | |
2165 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, | |
2166 | "..", 2, -1); | |
2167 | if (IS_ERR(di)) { | |
2168 | ret = PTR_ERR(di); | |
2169 | goto out_fail; | |
2170 | } | |
2171 | if (!di) { | |
2172 | ret = -ENOENT; | |
2173 | goto out_fail; | |
2174 | } | |
2175 | old_parent_oid = btrfs_disk_key_objectid(&di->location); | |
2176 | ret = btrfs_del_item(trans, root, path); | |
2177 | if (ret) { | |
39279cc3 CM |
2178 | goto out_fail; |
2179 | } | |
2180 | btrfs_release_path(root, path); | |
2181 | ||
2182 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2183 | old_inode->i_ino, | |
2184 | old_parent_oid, | |
2185 | "..", 2, -1); | |
2186 | if (IS_ERR(di)) { | |
2187 | ret = PTR_ERR(di); | |
2188 | goto out_fail; | |
2189 | } | |
2190 | if (!di) { | |
2191 | ret = -ENOENT; | |
2192 | goto out_fail; | |
2193 | } | |
2194 | ret = btrfs_del_item(trans, root, path); | |
2195 | if (ret) { | |
39279cc3 CM |
2196 | goto out_fail; |
2197 | } | |
2198 | btrfs_release_path(root, path); | |
2199 | ||
2200 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2201 | old_inode->i_ino, location, | |
2202 | BTRFS_FT_DIR); | |
2203 | if (ret) | |
2204 | goto out_fail; | |
2205 | } | |
2206 | ||
2207 | ||
2208 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); | |
2209 | if (ret) | |
2210 | goto out_fail; | |
2211 | ||
2212 | if (new_inode) { | |
2213 | new_inode->i_ctime = CURRENT_TIME; | |
2214 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2215 | if (ret) | |
2216 | goto out_fail; | |
39279cc3 CM |
2217 | } |
2218 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2219 | if (ret) | |
2220 | goto out_fail; | |
2221 | ||
2222 | out_fail: | |
2223 | btrfs_free_path(path); | |
2224 | btrfs_end_transaction(trans, root); | |
2225 | mutex_unlock(&root->fs_info->fs_mutex); | |
2226 | return ret; | |
2227 | } | |
2228 | ||
2229 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2230 | const char *symname) | |
2231 | { | |
2232 | struct btrfs_trans_handle *trans; | |
2233 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2234 | struct btrfs_path *path; | |
2235 | struct btrfs_key key; | |
2236 | struct inode *inode; | |
2237 | int err; | |
2238 | int drop_inode = 0; | |
2239 | u64 objectid; | |
2240 | int name_len; | |
2241 | int datasize; | |
2242 | char *ptr; | |
2243 | struct btrfs_file_extent_item *ei; | |
2244 | ||
2245 | name_len = strlen(symname) + 1; | |
2246 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2247 | return -ENAMETOOLONG; | |
2248 | mutex_lock(&root->fs_info->fs_mutex); | |
2249 | trans = btrfs_start_transaction(root, 1); | |
2250 | btrfs_set_trans_block_group(trans, dir); | |
2251 | ||
2252 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2253 | if (err) { | |
2254 | err = -ENOSPC; | |
2255 | goto out_unlock; | |
2256 | } | |
2257 | ||
2258 | inode = btrfs_new_inode(trans, root, objectid, | |
2259 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2260 | err = PTR_ERR(inode); | |
2261 | if (IS_ERR(inode)) | |
2262 | goto out_unlock; | |
2263 | ||
2264 | btrfs_set_trans_block_group(trans, inode); | |
2265 | err = btrfs_add_nondir(trans, dentry, inode); | |
2266 | if (err) | |
2267 | drop_inode = 1; | |
2268 | else { | |
2269 | inode->i_mapping->a_ops = &btrfs_aops; | |
2270 | inode->i_fop = &btrfs_file_operations; | |
2271 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2272 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2273 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2274 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2275 | } |
2276 | dir->i_sb->s_dirt = 1; | |
2277 | btrfs_update_inode_block_group(trans, inode); | |
2278 | btrfs_update_inode_block_group(trans, dir); | |
2279 | if (drop_inode) | |
2280 | goto out_unlock; | |
2281 | ||
2282 | path = btrfs_alloc_path(); | |
2283 | BUG_ON(!path); | |
2284 | key.objectid = inode->i_ino; | |
2285 | key.offset = 0; | |
2286 | key.flags = 0; | |
2287 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
2288 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2289 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2290 | datasize); | |
54aa1f4d CM |
2291 | if (err) { |
2292 | drop_inode = 1; | |
2293 | goto out_unlock; | |
2294 | } | |
39279cc3 CM |
2295 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
2296 | path->slots[0], struct btrfs_file_extent_item); | |
2297 | btrfs_set_file_extent_generation(ei, trans->transid); | |
2298 | btrfs_set_file_extent_type(ei, | |
2299 | BTRFS_FILE_EXTENT_INLINE); | |
2300 | ptr = btrfs_file_extent_inline_start(ei); | |
2301 | btrfs_memcpy(root, path->nodes[0]->b_data, | |
2302 | ptr, symname, name_len); | |
ccd467d6 | 2303 | btrfs_mark_buffer_dirty(path->nodes[0]); |
39279cc3 CM |
2304 | btrfs_free_path(path); |
2305 | inode->i_op = &btrfs_symlink_inode_operations; | |
2306 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2307 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2308 | err = btrfs_update_inode(trans, root, inode); |
2309 | if (err) | |
2310 | drop_inode = 1; | |
39279cc3 CM |
2311 | |
2312 | out_unlock: | |
2313 | btrfs_end_transaction(trans, root); | |
2314 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2315 | if (drop_inode) { |
2316 | inode_dec_link_count(inode); | |
2317 | iput(inode); | |
2318 | } | |
2319 | btrfs_btree_balance_dirty(root); | |
2320 | return err; | |
2321 | } | |
2322 | ||
2323 | static struct inode_operations btrfs_dir_inode_operations = { | |
2324 | .lookup = btrfs_lookup, | |
2325 | .create = btrfs_create, | |
2326 | .unlink = btrfs_unlink, | |
2327 | .link = btrfs_link, | |
2328 | .mkdir = btrfs_mkdir, | |
2329 | .rmdir = btrfs_rmdir, | |
2330 | .rename = btrfs_rename, | |
2331 | .symlink = btrfs_symlink, | |
2332 | .setattr = btrfs_setattr, | |
618e21d5 | 2333 | .mknod = btrfs_mknod, |
39279cc3 CM |
2334 | }; |
2335 | ||
2336 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2337 | .lookup = btrfs_lookup, | |
2338 | }; | |
2339 | ||
2340 | static struct file_operations btrfs_dir_file_operations = { | |
2341 | .llseek = generic_file_llseek, | |
2342 | .read = generic_read_dir, | |
2343 | .readdir = btrfs_readdir, | |
2344 | .ioctl = btrfs_ioctl, | |
2345 | #ifdef CONFIG_COMPAT | |
2346 | .compat_ioctl = btrfs_compat_ioctl, | |
2347 | #endif | |
2348 | }; | |
2349 | ||
07157aac CM |
2350 | static struct extent_map_ops btrfs_extent_map_ops = { |
2351 | .fill_delalloc = run_delalloc_range, | |
2352 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2353 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2354 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2355 | }; | |
2356 | ||
39279cc3 CM |
2357 | static struct address_space_operations btrfs_aops = { |
2358 | .readpage = btrfs_readpage, | |
2359 | .writepage = btrfs_writepage, | |
2360 | .sync_page = block_sync_page, | |
2361 | .prepare_write = btrfs_prepare_write, | |
2362 | .commit_write = btrfs_commit_write, | |
2363 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2364 | .invalidatepage = btrfs_invalidatepage, |
2365 | .releasepage = btrfs_releasepage, | |
2366 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2367 | }; |
2368 | ||
2369 | static struct address_space_operations btrfs_symlink_aops = { | |
2370 | .readpage = btrfs_readpage, | |
2371 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2372 | .invalidatepage = btrfs_invalidatepage, |
2373 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2374 | }; |
2375 | ||
2376 | static struct inode_operations btrfs_file_inode_operations = { | |
2377 | .truncate = btrfs_truncate, | |
2378 | .getattr = btrfs_getattr, | |
2379 | .setattr = btrfs_setattr, | |
2380 | }; | |
2381 | ||
618e21d5 JB |
2382 | static struct inode_operations btrfs_special_inode_operations = { |
2383 | .getattr = btrfs_getattr, | |
2384 | .setattr = btrfs_setattr, | |
2385 | }; | |
2386 | ||
39279cc3 CM |
2387 | static struct inode_operations btrfs_symlink_inode_operations = { |
2388 | .readlink = generic_readlink, | |
2389 | .follow_link = page_follow_link_light, | |
2390 | .put_link = page_put_link, | |
2391 | }; |