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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> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 56 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
57 | |
58 | static struct kmem_cache *btrfs_inode_cachep; | |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | |
60 | struct kmem_cache *btrfs_transaction_cachep; | |
61 | struct kmem_cache *btrfs_bit_radix_cachep; | |
62 | struct kmem_cache *btrfs_path_cachep; | |
63 | ||
64 | #define S_SHIFT 12 | |
65 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
66 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
67 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
68 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
69 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
70 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
71 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
72 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
73 | }; | |
74 | ||
1832a6d5 CM |
75 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
76 | int for_del) | |
77 | { | |
78 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
79 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
80 | u64 thresh; | |
81 | int ret = 0; | |
82 | ||
83 | if (for_del) | |
f9ef6604 | 84 | thresh = total * 90; |
1832a6d5 | 85 | else |
f9ef6604 CM |
86 | thresh = total * 85; |
87 | ||
88 | do_div(thresh, 100); | |
1832a6d5 CM |
89 | |
90 | spin_lock(&root->fs_info->delalloc_lock); | |
91 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
92 | ret = -ENOSPC; | |
93 | spin_unlock(&root->fs_info->delalloc_lock); | |
94 | return ret; | |
95 | } | |
96 | ||
be20aa9d | 97 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
98 | { |
99 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
100 | struct btrfs_trans_handle *trans; | |
b888db2b | 101 | u64 alloc_hint = 0; |
db94535d | 102 | u64 num_bytes; |
c59f8951 | 103 | u64 cur_alloc_size; |
db94535d | 104 | u64 blocksize = root->sectorsize; |
be20aa9d CM |
105 | struct btrfs_key ins; |
106 | int ret; | |
b888db2b | 107 | |
b888db2b | 108 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 109 | BUG_ON(!trans); |
be20aa9d CM |
110 | btrfs_set_trans_block_group(trans, inode); |
111 | ||
db94535d | 112 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 113 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 114 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 115 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 116 | |
179e29e4 CM |
117 | if (alloc_hint == EXTENT_MAP_INLINE) |
118 | goto out; | |
119 | ||
c59f8951 CM |
120 | while(num_bytes > 0) { |
121 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
122 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
123 | root->root_key.objectid, | |
124 | trans->transid, | |
125 | inode->i_ino, start, 0, | |
126 | alloc_hint, (u64)-1, &ins, 1); | |
127 | if (ret) { | |
128 | WARN_ON(1); | |
129 | goto out; | |
130 | } | |
131 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
132 | start, ins.objectid, ins.offset, | |
133 | ins.offset); | |
134 | num_bytes -= cur_alloc_size; | |
135 | alloc_hint = ins.objectid + ins.offset; | |
136 | start += cur_alloc_size; | |
b888db2b | 137 | } |
dc17ff8f | 138 | btrfs_add_ordered_inode(inode); |
b888db2b CM |
139 | out: |
140 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
141 | return ret; |
142 | } | |
143 | ||
144 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
145 | { | |
146 | u64 extent_start; | |
147 | u64 extent_end; | |
148 | u64 bytenr; | |
149 | u64 cow_end; | |
1832a6d5 | 150 | u64 loops = 0; |
be20aa9d CM |
151 | struct btrfs_root *root = BTRFS_I(inode)->root; |
152 | struct extent_buffer *leaf; | |
153 | int found_type; | |
154 | struct btrfs_path *path; | |
155 | struct btrfs_file_extent_item *item; | |
156 | int ret; | |
157 | int err; | |
158 | struct btrfs_key found_key; | |
159 | ||
160 | path = btrfs_alloc_path(); | |
161 | BUG_ON(!path); | |
162 | again: | |
163 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
164 | inode->i_ino, start, 0); | |
165 | if (ret < 0) { | |
166 | btrfs_free_path(path); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | cow_end = end; | |
171 | if (ret != 0) { | |
172 | if (path->slots[0] == 0) | |
173 | goto not_found; | |
174 | path->slots[0]--; | |
175 | } | |
176 | ||
177 | leaf = path->nodes[0]; | |
178 | item = btrfs_item_ptr(leaf, path->slots[0], | |
179 | struct btrfs_file_extent_item); | |
180 | ||
181 | /* are we inside the extent that was found? */ | |
182 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
183 | found_type = btrfs_key_type(&found_key); | |
184 | if (found_key.objectid != inode->i_ino || | |
185 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
186 | goto not_found; | |
187 | } | |
188 | ||
189 | found_type = btrfs_file_extent_type(leaf, item); | |
190 | extent_start = found_key.offset; | |
191 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
192 | extent_end = extent_start + | |
193 | btrfs_file_extent_num_bytes(leaf, item); | |
194 | err = 0; | |
195 | ||
1832a6d5 CM |
196 | if (loops && start != extent_start) |
197 | goto not_found; | |
198 | ||
be20aa9d CM |
199 | if (start < extent_start || start >= extent_end) |
200 | goto not_found; | |
201 | ||
202 | cow_end = min(end, extent_end - 1); | |
203 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
204 | if (bytenr == 0) | |
205 | goto not_found; | |
206 | ||
be20aa9d CM |
207 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
208 | goto not_found; | |
209 | } | |
210 | ||
211 | start = extent_end; | |
bd09835d | 212 | } else { |
be20aa9d CM |
213 | goto not_found; |
214 | } | |
215 | loop: | |
216 | if (start > end) { | |
217 | btrfs_free_path(path); | |
218 | return 0; | |
219 | } | |
220 | btrfs_release_path(root, path); | |
1832a6d5 | 221 | loops++; |
be20aa9d CM |
222 | goto again; |
223 | ||
224 | not_found: | |
225 | cow_file_range(inode, start, cow_end); | |
226 | start = cow_end + 1; | |
227 | goto loop; | |
228 | } | |
229 | ||
230 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
231 | { | |
232 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1832a6d5 | 233 | u64 num_bytes; |
be20aa9d CM |
234 | int ret; |
235 | ||
236 | mutex_lock(&root->fs_info->fs_mutex); | |
237 | if (btrfs_test_opt(root, NODATACOW)) | |
238 | ret = run_delalloc_nocow(inode, start, end); | |
239 | else | |
240 | ret = cow_file_range(inode, start, end); | |
1832a6d5 CM |
241 | |
242 | spin_lock(&root->fs_info->delalloc_lock); | |
243 | num_bytes = end + 1 - start; | |
244 | if (root->fs_info->delalloc_bytes < num_bytes) { | |
245 | printk("delalloc accounting error total %llu sub %llu\n", | |
246 | root->fs_info->delalloc_bytes, num_bytes); | |
247 | } else { | |
248 | root->fs_info->delalloc_bytes -= num_bytes; | |
249 | } | |
250 | spin_unlock(&root->fs_info->delalloc_lock); | |
251 | ||
b888db2b CM |
252 | mutex_unlock(&root->fs_info->fs_mutex); |
253 | return ret; | |
254 | } | |
255 | ||
07157aac CM |
256 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
257 | { | |
258 | struct inode *inode = page->mapping->host; | |
259 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
260 | struct btrfs_trans_handle *trans; | |
261 | char *kaddr; | |
b6cda9bc | 262 | int ret = 0; |
35ebb934 | 263 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
264 | size_t offset = start - page_start; |
265 | ||
b6cda9bc CM |
266 | if (btrfs_test_opt(root, NODATASUM)) |
267 | return 0; | |
268 | ||
07157aac CM |
269 | mutex_lock(&root->fs_info->fs_mutex); |
270 | trans = btrfs_start_transaction(root, 1); | |
271 | btrfs_set_trans_block_group(trans, inode); | |
272 | kaddr = kmap(page); | |
f578d4bd | 273 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
274 | start, kaddr + offset, end - start + 1); |
275 | kunmap(page); | |
276 | ret = btrfs_end_transaction(trans, root); | |
277 | BUG_ON(ret); | |
278 | mutex_unlock(&root->fs_info->fs_mutex); | |
279 | return ret; | |
280 | } | |
281 | ||
282 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
283 | { | |
284 | int ret = 0; | |
285 | struct inode *inode = page->mapping->host; | |
286 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
287 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
288 | struct btrfs_csum_item *item; | |
289 | struct btrfs_path *path = NULL; | |
ff79f819 | 290 | u32 csum; |
07157aac | 291 | |
b6cda9bc CM |
292 | if (btrfs_test_opt(root, NODATASUM)) |
293 | return 0; | |
294 | ||
07157aac CM |
295 | mutex_lock(&root->fs_info->fs_mutex); |
296 | path = btrfs_alloc_path(); | |
297 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
298 | if (IS_ERR(item)) { | |
299 | ret = PTR_ERR(item); | |
300 | /* a csum that isn't present is a preallocated region. */ | |
301 | if (ret == -ENOENT || ret == -EFBIG) | |
302 | ret = 0; | |
ff79f819 | 303 | csum = 0; |
07157aac CM |
304 | goto out; |
305 | } | |
ff79f819 CM |
306 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
307 | BTRFS_CRC32_SIZE); | |
308 | set_state_private(em_tree, start, csum); | |
07157aac CM |
309 | out: |
310 | if (path) | |
311 | btrfs_free_path(path); | |
312 | mutex_unlock(&root->fs_info->fs_mutex); | |
313 | return ret; | |
314 | } | |
315 | ||
316 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
317 | { | |
35ebb934 | 318 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 319 | struct inode *inode = page->mapping->host; |
07157aac CM |
320 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
321 | char *kaddr; | |
322 | u64 private; | |
323 | int ret; | |
ff79f819 CM |
324 | struct btrfs_root *root = BTRFS_I(inode)->root; |
325 | u32 csum = ~(u32)0; | |
bbf0d006 | 326 | unsigned long flags; |
07157aac | 327 | |
b6cda9bc CM |
328 | if (btrfs_test_opt(root, NODATASUM)) |
329 | return 0; | |
330 | ||
07157aac | 331 | ret = get_state_private(em_tree, start, &private); |
bbf0d006 | 332 | local_irq_save(flags); |
07157aac CM |
333 | kaddr = kmap_atomic(page, KM_IRQ0); |
334 | if (ret) { | |
335 | goto zeroit; | |
336 | } | |
ff79f819 CM |
337 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
338 | btrfs_csum_final(csum, (char *)&csum); | |
339 | if (csum != private) { | |
07157aac CM |
340 | goto zeroit; |
341 | } | |
342 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 343 | local_irq_restore(flags); |
07157aac CM |
344 | return 0; |
345 | ||
346 | zeroit: | |
347 | printk("btrfs csum failed ino %lu off %llu\n", | |
348 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
349 | memset(kaddr + offset, 1, end - start + 1); |
350 | flush_dcache_page(page); | |
07157aac | 351 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 352 | local_irq_restore(flags); |
07157aac CM |
353 | return 0; |
354 | } | |
b888db2b | 355 | |
39279cc3 CM |
356 | void btrfs_read_locked_inode(struct inode *inode) |
357 | { | |
358 | struct btrfs_path *path; | |
5f39d397 | 359 | struct extent_buffer *leaf; |
39279cc3 | 360 | struct btrfs_inode_item *inode_item; |
5f39d397 | 361 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
362 | struct btrfs_root *root = BTRFS_I(inode)->root; |
363 | struct btrfs_key location; | |
364 | u64 alloc_group_block; | |
618e21d5 | 365 | u32 rdev; |
39279cc3 CM |
366 | int ret; |
367 | ||
368 | path = btrfs_alloc_path(); | |
369 | BUG_ON(!path); | |
39279cc3 | 370 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 371 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 372 | |
39279cc3 | 373 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 374 | if (ret) |
39279cc3 | 375 | goto make_bad; |
39279cc3 | 376 | |
5f39d397 CM |
377 | leaf = path->nodes[0]; |
378 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
379 | struct btrfs_inode_item); | |
380 | ||
381 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
382 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
383 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
384 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
385 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
386 | ||
387 | tspec = btrfs_inode_atime(inode_item); | |
388 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
389 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
390 | ||
391 | tspec = btrfs_inode_mtime(inode_item); | |
392 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
393 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
394 | ||
395 | tspec = btrfs_inode_ctime(inode_item); | |
396 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
397 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
398 | ||
399 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
400 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 401 | inode->i_rdev = 0; |
5f39d397 CM |
402 | rdev = btrfs_inode_rdev(leaf, inode_item); |
403 | ||
404 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
405 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
406 | alloc_group_block); | |
407 | ||
e52ec0eb CM |
408 | if (!BTRFS_I(inode)->block_group) { |
409 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
410 | NULL, 0, 0, 0); | |
411 | } | |
39279cc3 CM |
412 | btrfs_free_path(path); |
413 | inode_item = NULL; | |
414 | ||
415 | mutex_unlock(&root->fs_info->fs_mutex); | |
416 | ||
417 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
418 | case S_IFREG: |
419 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 420 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
421 | inode->i_fop = &btrfs_file_operations; |
422 | inode->i_op = &btrfs_file_inode_operations; | |
423 | break; | |
424 | case S_IFDIR: | |
425 | inode->i_fop = &btrfs_dir_file_operations; | |
426 | if (root == root->fs_info->tree_root) | |
427 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
428 | else | |
429 | inode->i_op = &btrfs_dir_inode_operations; | |
430 | break; | |
431 | case S_IFLNK: | |
432 | inode->i_op = &btrfs_symlink_inode_operations; | |
433 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
434 | break; | |
618e21d5 JB |
435 | default: |
436 | init_special_inode(inode, inode->i_mode, rdev); | |
437 | break; | |
39279cc3 CM |
438 | } |
439 | return; | |
440 | ||
441 | make_bad: | |
442 | btrfs_release_path(root, path); | |
443 | btrfs_free_path(path); | |
444 | mutex_unlock(&root->fs_info->fs_mutex); | |
445 | make_bad_inode(inode); | |
446 | } | |
447 | ||
5f39d397 CM |
448 | static void fill_inode_item(struct extent_buffer *leaf, |
449 | struct btrfs_inode_item *item, | |
39279cc3 CM |
450 | struct inode *inode) |
451 | { | |
5f39d397 CM |
452 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
453 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
454 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
455 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
456 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
457 | ||
458 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
459 | inode->i_atime.tv_sec); | |
460 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
461 | inode->i_atime.tv_nsec); | |
462 | ||
463 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
464 | inode->i_mtime.tv_sec); | |
465 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
466 | inode->i_mtime.tv_nsec); | |
467 | ||
468 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
469 | inode->i_ctime.tv_sec); | |
470 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
471 | inode->i_ctime.tv_nsec); | |
472 | ||
473 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
474 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
475 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
476 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
477 | BTRFS_I(inode)->block_group->key.objectid); |
478 | } | |
479 | ||
a52d9a80 | 480 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
481 | struct btrfs_root *root, |
482 | struct inode *inode) | |
483 | { | |
484 | struct btrfs_inode_item *inode_item; | |
485 | struct btrfs_path *path; | |
5f39d397 | 486 | struct extent_buffer *leaf; |
39279cc3 CM |
487 | int ret; |
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); | |
493 | if (ret) { | |
494 | if (ret > 0) | |
495 | ret = -ENOENT; | |
496 | goto failed; | |
497 | } | |
498 | ||
5f39d397 CM |
499 | leaf = path->nodes[0]; |
500 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
501 | struct btrfs_inode_item); |
502 | ||
5f39d397 CM |
503 | fill_inode_item(leaf, inode_item, inode); |
504 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 505 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
506 | ret = 0; |
507 | failed: | |
508 | btrfs_release_path(root, path); | |
509 | btrfs_free_path(path); | |
510 | return ret; | |
511 | } | |
512 | ||
513 | ||
514 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
515 | struct btrfs_root *root, | |
516 | struct inode *dir, | |
517 | struct dentry *dentry) | |
518 | { | |
519 | struct btrfs_path *path; | |
520 | const char *name = dentry->d_name.name; | |
521 | int name_len = dentry->d_name.len; | |
522 | int ret = 0; | |
5f39d397 | 523 | struct extent_buffer *leaf; |
39279cc3 | 524 | struct btrfs_dir_item *di; |
5f39d397 | 525 | struct btrfs_key key; |
39279cc3 CM |
526 | |
527 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
528 | if (!path) { |
529 | ret = -ENOMEM; | |
530 | goto err; | |
531 | } | |
532 | ||
39279cc3 CM |
533 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
534 | name, name_len, -1); | |
535 | if (IS_ERR(di)) { | |
536 | ret = PTR_ERR(di); | |
537 | goto err; | |
538 | } | |
539 | if (!di) { | |
540 | ret = -ENOENT; | |
541 | goto err; | |
542 | } | |
5f39d397 CM |
543 | leaf = path->nodes[0]; |
544 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 545 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
546 | if (ret) |
547 | goto err; | |
39279cc3 CM |
548 | btrfs_release_path(root, path); |
549 | ||
550 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 551 | key.objectid, name, name_len, -1); |
39279cc3 CM |
552 | if (IS_ERR(di)) { |
553 | ret = PTR_ERR(di); | |
554 | goto err; | |
555 | } | |
556 | if (!di) { | |
557 | ret = -ENOENT; | |
558 | goto err; | |
559 | } | |
560 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
561 | |
562 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
563 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
564 | dentry->d_inode->i_ino, | |
565 | dentry->d_parent->d_inode->i_ino); | |
566 | if (ret) { | |
567 | printk("failed to delete reference to %.*s, " | |
568 | "inode %lu parent %lu\n", name_len, name, | |
569 | dentry->d_inode->i_ino, | |
570 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 571 | } |
39279cc3 CM |
572 | err: |
573 | btrfs_free_path(path); | |
574 | if (!ret) { | |
575 | dir->i_size -= name_len * 2; | |
79c44584 | 576 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 577 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
578 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
579 | dentry->d_inode->i_nlink--; | |
580 | #else | |
39279cc3 | 581 | drop_nlink(dentry->d_inode); |
6da6abae | 582 | #endif |
54aa1f4d | 583 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
584 | dir->i_sb->s_dirt = 1; |
585 | } | |
586 | return ret; | |
587 | } | |
588 | ||
589 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
590 | { | |
591 | struct btrfs_root *root; | |
592 | struct btrfs_trans_handle *trans; | |
593 | int ret; | |
1832a6d5 | 594 | unsigned long nr = 0; |
39279cc3 CM |
595 | |
596 | root = BTRFS_I(dir)->root; | |
597 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
598 | |
599 | ret = btrfs_check_free_space(root, 1, 1); | |
600 | if (ret) | |
601 | goto fail; | |
602 | ||
39279cc3 | 603 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 604 | |
39279cc3 CM |
605 | btrfs_set_trans_block_group(trans, dir); |
606 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 607 | nr = trans->blocks_used; |
5f39d397 | 608 | |
39279cc3 | 609 | btrfs_end_transaction(trans, root); |
1832a6d5 | 610 | fail: |
39279cc3 | 611 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 612 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
613 | return ret; |
614 | } | |
615 | ||
616 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
617 | { | |
618 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 619 | int err = 0; |
39279cc3 CM |
620 | int ret; |
621 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 622 | struct btrfs_trans_handle *trans; |
1832a6d5 | 623 | unsigned long nr = 0; |
39279cc3 | 624 | |
134d4512 Y |
625 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
626 | return -ENOTEMPTY; | |
627 | ||
39279cc3 | 628 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
629 | ret = btrfs_check_free_space(root, 1, 1); |
630 | if (ret) | |
631 | goto fail; | |
632 | ||
39279cc3 CM |
633 | trans = btrfs_start_transaction(root, 1); |
634 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
635 | |
636 | /* now the directory is empty */ | |
637 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
638 | if (!err) { | |
639 | inode->i_size = 0; | |
640 | } | |
3954401f | 641 | |
d3c2fdcf | 642 | nr = trans->blocks_used; |
39279cc3 | 643 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 644 | fail: |
134d4512 | 645 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 646 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 647 | |
39279cc3 CM |
648 | if (ret && !err) |
649 | err = ret; | |
650 | return err; | |
651 | } | |
652 | ||
653 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
654 | struct btrfs_root *root, | |
655 | struct inode *inode) | |
656 | { | |
657 | struct btrfs_path *path; | |
658 | int ret; | |
659 | ||
660 | clear_inode(inode); | |
661 | ||
662 | path = btrfs_alloc_path(); | |
663 | BUG_ON(!path); | |
39279cc3 CM |
664 | ret = btrfs_lookup_inode(trans, root, path, |
665 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
666 | if (ret > 0) |
667 | ret = -ENOENT; | |
668 | if (!ret) | |
669 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
670 | btrfs_free_path(path); |
671 | return ret; | |
672 | } | |
673 | ||
39279cc3 CM |
674 | /* |
675 | * this can truncate away extent items, csum items and directory items. | |
676 | * It starts at a high offset and removes keys until it can't find | |
677 | * any higher than i_size. | |
678 | * | |
679 | * csum items that cross the new i_size are truncated to the new size | |
680 | * as well. | |
681 | */ | |
682 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
683 | struct btrfs_root *root, | |
684 | struct inode *inode) | |
685 | { | |
686 | int ret; | |
687 | struct btrfs_path *path; | |
688 | struct btrfs_key key; | |
5f39d397 | 689 | struct btrfs_key found_key; |
39279cc3 | 690 | u32 found_type; |
5f39d397 | 691 | struct extent_buffer *leaf; |
39279cc3 CM |
692 | struct btrfs_file_extent_item *fi; |
693 | u64 extent_start = 0; | |
db94535d | 694 | u64 extent_num_bytes = 0; |
39279cc3 | 695 | u64 item_end = 0; |
7bb86316 | 696 | u64 root_gen = 0; |
d8d5f3e1 | 697 | u64 root_owner = 0; |
39279cc3 CM |
698 | int found_extent; |
699 | int del_item; | |
179e29e4 | 700 | int extent_type = -1; |
39279cc3 | 701 | |
a52d9a80 | 702 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 703 | path = btrfs_alloc_path(); |
3c69faec | 704 | path->reada = -1; |
39279cc3 | 705 | BUG_ON(!path); |
5f39d397 | 706 | |
39279cc3 CM |
707 | /* FIXME, add redo link to tree so we don't leak on crash */ |
708 | key.objectid = inode->i_ino; | |
709 | key.offset = (u64)-1; | |
5f39d397 CM |
710 | key.type = (u8)-1; |
711 | ||
39279cc3 CM |
712 | while(1) { |
713 | btrfs_init_path(path); | |
714 | fi = NULL; | |
715 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
716 | if (ret < 0) { | |
717 | goto error; | |
718 | } | |
719 | if (ret > 0) { | |
720 | BUG_ON(path->slots[0] == 0); | |
721 | path->slots[0]--; | |
722 | } | |
5f39d397 CM |
723 | leaf = path->nodes[0]; |
724 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
725 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 726 | |
5f39d397 | 727 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 728 | break; |
5f39d397 | 729 | |
39279cc3 CM |
730 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
731 | found_type != BTRFS_DIR_ITEM_KEY && | |
732 | found_type != BTRFS_DIR_INDEX_KEY && | |
733 | found_type != BTRFS_EXTENT_DATA_KEY) | |
734 | break; | |
735 | ||
5f39d397 | 736 | item_end = found_key.offset; |
39279cc3 | 737 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 738 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 739 | struct btrfs_file_extent_item); |
179e29e4 CM |
740 | extent_type = btrfs_file_extent_type(leaf, fi); |
741 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 742 | item_end += |
db94535d | 743 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
744 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
745 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
746 | path->slots[0]); | |
747 | item_end += btrfs_file_extent_inline_len(leaf, | |
748 | item); | |
39279cc3 | 749 | } |
008630c1 | 750 | item_end--; |
39279cc3 CM |
751 | } |
752 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
753 | ret = btrfs_csum_truncate(trans, root, path, | |
754 | inode->i_size); | |
755 | BUG_ON(ret); | |
756 | } | |
008630c1 | 757 | if (item_end < inode->i_size) { |
b888db2b CM |
758 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
759 | found_type = BTRFS_INODE_ITEM_KEY; | |
760 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
761 | found_type = BTRFS_CSUM_ITEM_KEY; | |
762 | } else if (found_type) { | |
763 | found_type--; | |
764 | } else { | |
765 | break; | |
39279cc3 | 766 | } |
a61721d5 | 767 | btrfs_set_key_type(&key, found_type); |
65555a06 | 768 | btrfs_release_path(root, path); |
b888db2b | 769 | continue; |
39279cc3 | 770 | } |
5f39d397 | 771 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
772 | del_item = 1; |
773 | else | |
774 | del_item = 0; | |
775 | found_extent = 0; | |
776 | ||
777 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
778 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
779 | goto delete; | |
780 | ||
781 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 782 | u64 num_dec; |
db94535d | 783 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 784 | if (!del_item) { |
db94535d CM |
785 | u64 orig_num_bytes = |
786 | btrfs_file_extent_num_bytes(leaf, fi); | |
787 | extent_num_bytes = inode->i_size - | |
5f39d397 | 788 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
789 | btrfs_set_file_extent_num_bytes(leaf, fi, |
790 | extent_num_bytes); | |
791 | num_dec = (orig_num_bytes - | |
792 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
793 | if (extent_start != 0) { |
794 | inode->i_blocks -= num_dec; | |
795 | } | |
5f39d397 | 796 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 797 | } else { |
db94535d CM |
798 | extent_num_bytes = |
799 | btrfs_file_extent_disk_num_bytes(leaf, | |
800 | fi); | |
39279cc3 | 801 | /* FIXME blocksize != 4096 */ |
db94535d CM |
802 | num_dec = btrfs_file_extent_num_bytes(leaf, |
803 | fi) >> 9; | |
39279cc3 CM |
804 | if (extent_start != 0) { |
805 | found_extent = 1; | |
806 | inode->i_blocks -= num_dec; | |
807 | } | |
d8d5f3e1 CM |
808 | root_gen = btrfs_header_generation(leaf); |
809 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 810 | } |
179e29e4 CM |
811 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
812 | !del_item) { | |
813 | u32 newsize = inode->i_size - found_key.offset; | |
814 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
815 | ret = btrfs_truncate_item(trans, root, path, | |
816 | newsize, 1); | |
817 | BUG_ON(ret); | |
39279cc3 | 818 | } |
179e29e4 | 819 | delete: |
39279cc3 CM |
820 | if (del_item) { |
821 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
822 | if (ret) |
823 | goto error; | |
39279cc3 CM |
824 | } else { |
825 | break; | |
826 | } | |
827 | btrfs_release_path(root, path); | |
828 | if (found_extent) { | |
829 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 830 | extent_num_bytes, |
d8d5f3e1 | 831 | root_owner, |
7bb86316 CM |
832 | root_gen, inode->i_ino, |
833 | found_key.offset, 0); | |
39279cc3 CM |
834 | BUG_ON(ret); |
835 | } | |
836 | } | |
837 | ret = 0; | |
838 | error: | |
839 | btrfs_release_path(root, path); | |
840 | btrfs_free_path(path); | |
841 | inode->i_sb->s_dirt = 1; | |
842 | return ret; | |
843 | } | |
844 | ||
b888db2b | 845 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
846 | size_t zero_start) |
847 | { | |
848 | char *kaddr; | |
b888db2b | 849 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
1832a6d5 | 850 | struct btrfs_root *root = BTRFS_I(inode)->root; |
35ebb934 | 851 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 852 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 CM |
853 | u64 existing_delalloc; |
854 | u64 delalloc_start; | |
855 | int ret = 0; | |
a52d9a80 | 856 | |
190662b2 | 857 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 858 | set_page_extent_mapped(page); |
a52d9a80 | 859 | |
b888db2b | 860 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
1832a6d5 CM |
861 | delalloc_start = page_start; |
862 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree, | |
863 | &delalloc_start, page_end, | |
864 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
b888db2b CM |
865 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, |
866 | page_end, GFP_NOFS); | |
1832a6d5 CM |
867 | |
868 | spin_lock(&root->fs_info->delalloc_lock); | |
869 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc; | |
870 | spin_unlock(&root->fs_info->delalloc_lock); | |
871 | ||
a52d9a80 | 872 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 873 | kaddr = kmap(page); |
a52d9a80 CM |
874 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
875 | flush_dcache_page(page); | |
b888db2b | 876 | kunmap(page); |
a52d9a80 | 877 | } |
b888db2b CM |
878 | set_page_dirty(page); |
879 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 880 | |
a52d9a80 CM |
881 | return ret; |
882 | } | |
883 | ||
39279cc3 CM |
884 | /* |
885 | * taken from block_truncate_page, but does cow as it zeros out | |
886 | * any bytes left in the last page in the file. | |
887 | */ | |
888 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
889 | { | |
890 | struct inode *inode = mapping->host; | |
db94535d CM |
891 | struct btrfs_root *root = BTRFS_I(inode)->root; |
892 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
893 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
894 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
895 | struct page *page; | |
39279cc3 | 896 | int ret = 0; |
a52d9a80 | 897 | u64 page_start; |
39279cc3 CM |
898 | |
899 | if ((offset & (blocksize - 1)) == 0) | |
900 | goto out; | |
901 | ||
902 | ret = -ENOMEM; | |
903 | page = grab_cache_page(mapping, index); | |
904 | if (!page) | |
905 | goto out; | |
39279cc3 | 906 | if (!PageUptodate(page)) { |
9ebefb18 | 907 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
908 | lock_page(page); |
909 | if (!PageUptodate(page)) { | |
910 | ret = -EIO; | |
911 | goto out; | |
912 | } | |
913 | } | |
35ebb934 | 914 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 915 | |
b888db2b | 916 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 917 | |
39279cc3 CM |
918 | unlock_page(page); |
919 | page_cache_release(page); | |
920 | out: | |
921 | return ret; | |
922 | } | |
923 | ||
924 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
925 | { | |
926 | struct inode *inode = dentry->d_inode; | |
927 | int err; | |
928 | ||
929 | err = inode_change_ok(inode, attr); | |
930 | if (err) | |
931 | return err; | |
932 | ||
933 | if (S_ISREG(inode->i_mode) && | |
934 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
935 | struct btrfs_trans_handle *trans; | |
936 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
937 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
938 | ||
5f39d397 | 939 | u64 mask = root->sectorsize - 1; |
39279cc3 | 940 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 941 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 942 | u64 hole_size; |
179e29e4 | 943 | u64 alloc_hint = 0; |
39279cc3 CM |
944 | |
945 | if (attr->ia_size <= pos) | |
946 | goto out; | |
947 | ||
1832a6d5 CM |
948 | mutex_lock(&root->fs_info->fs_mutex); |
949 | err = btrfs_check_free_space(root, 1, 0); | |
950 | mutex_unlock(&root->fs_info->fs_mutex); | |
951 | if (err) | |
952 | goto fail; | |
953 | ||
39279cc3 CM |
954 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
955 | ||
2bf5a725 | 956 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 957 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
958 | |
959 | mutex_lock(&root->fs_info->fs_mutex); | |
960 | trans = btrfs_start_transaction(root, 1); | |
961 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 962 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
963 | pos, pos + hole_size, pos, |
964 | &alloc_hint); | |
2bf5a725 | 965 | |
179e29e4 CM |
966 | if (alloc_hint != EXTENT_MAP_INLINE) { |
967 | err = btrfs_insert_file_extent(trans, root, | |
968 | inode->i_ino, | |
969 | pos, 0, 0, hole_size); | |
970 | } | |
39279cc3 CM |
971 | btrfs_end_transaction(trans, root); |
972 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 973 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
974 | if (err) |
975 | return err; | |
39279cc3 CM |
976 | } |
977 | out: | |
978 | err = inode_setattr(inode, attr); | |
1832a6d5 | 979 | fail: |
39279cc3 CM |
980 | return err; |
981 | } | |
982 | void btrfs_delete_inode(struct inode *inode) | |
983 | { | |
984 | struct btrfs_trans_handle *trans; | |
985 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 986 | unsigned long nr; |
39279cc3 CM |
987 | int ret; |
988 | ||
989 | truncate_inode_pages(&inode->i_data, 0); | |
990 | if (is_bad_inode(inode)) { | |
991 | goto no_delete; | |
992 | } | |
5f39d397 | 993 | |
39279cc3 CM |
994 | inode->i_size = 0; |
995 | mutex_lock(&root->fs_info->fs_mutex); | |
996 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 997 | |
39279cc3 CM |
998 | btrfs_set_trans_block_group(trans, inode); |
999 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
1000 | if (ret) |
1001 | goto no_delete_lock; | |
1002 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
1003 | if (ret) |
1004 | goto no_delete_lock; | |
1005 | ret = btrfs_free_inode(trans, root, inode); | |
1006 | if (ret) | |
1007 | goto no_delete_lock; | |
d3c2fdcf | 1008 | nr = trans->blocks_used; |
5f39d397 | 1009 | |
39279cc3 CM |
1010 | btrfs_end_transaction(trans, root); |
1011 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1012 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1013 | return; |
54aa1f4d CM |
1014 | |
1015 | no_delete_lock: | |
d3c2fdcf | 1016 | nr = trans->blocks_used; |
54aa1f4d CM |
1017 | btrfs_end_transaction(trans, root); |
1018 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1019 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1020 | no_delete: |
1021 | clear_inode(inode); | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * this returns the key found in the dir entry in the location pointer. | |
1026 | * If no dir entries were found, location->objectid is 0. | |
1027 | */ | |
1028 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1029 | struct btrfs_key *location) | |
1030 | { | |
1031 | const char *name = dentry->d_name.name; | |
1032 | int namelen = dentry->d_name.len; | |
1033 | struct btrfs_dir_item *di; | |
1034 | struct btrfs_path *path; | |
1035 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1036 | int ret = 0; |
39279cc3 | 1037 | |
3954401f CM |
1038 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1039 | location->objectid = dir->i_ino; | |
1040 | location->type = BTRFS_INODE_ITEM_KEY; | |
1041 | location->offset = 0; | |
1042 | return 0; | |
1043 | } | |
39279cc3 CM |
1044 | path = btrfs_alloc_path(); |
1045 | BUG_ON(!path); | |
3954401f | 1046 | |
7a720536 | 1047 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1048 | struct btrfs_key key; |
1049 | struct extent_buffer *leaf; | |
1050 | u32 nritems; | |
1051 | int slot; | |
1052 | ||
1053 | key.objectid = dir->i_ino; | |
1054 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1055 | key.offset = 0; | |
1056 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1057 | BUG_ON(ret == 0); | |
1058 | ret = 0; | |
1059 | ||
1060 | leaf = path->nodes[0]; | |
1061 | slot = path->slots[0]; | |
1062 | nritems = btrfs_header_nritems(leaf); | |
1063 | if (slot >= nritems) | |
1064 | goto out_err; | |
1065 | ||
1066 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1067 | if (key.objectid != dir->i_ino || | |
1068 | key.type != BTRFS_INODE_REF_KEY) { | |
1069 | goto out_err; | |
1070 | } | |
1071 | location->objectid = key.offset; | |
1072 | location->type = BTRFS_INODE_ITEM_KEY; | |
1073 | location->offset = 0; | |
1074 | goto out; | |
1075 | } | |
1076 | ||
39279cc3 CM |
1077 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1078 | namelen, 0); | |
0d9f7f3e Y |
1079 | if (IS_ERR(di)) |
1080 | ret = PTR_ERR(di); | |
39279cc3 | 1081 | if (!di || IS_ERR(di)) { |
3954401f | 1082 | goto out_err; |
39279cc3 | 1083 | } |
5f39d397 | 1084 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1085 | out: |
39279cc3 CM |
1086 | btrfs_free_path(path); |
1087 | return ret; | |
3954401f CM |
1088 | out_err: |
1089 | location->objectid = 0; | |
1090 | goto out; | |
39279cc3 CM |
1091 | } |
1092 | ||
1093 | /* | |
1094 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1095 | * needs to be changed to reflect the root directory of the tree root. This | |
1096 | * is kind of like crossing a mount point. | |
1097 | */ | |
1098 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1099 | struct btrfs_key *location, | |
58176a96 JB |
1100 | struct btrfs_root **sub_root, |
1101 | struct dentry *dentry) | |
39279cc3 CM |
1102 | { |
1103 | struct btrfs_path *path; | |
1104 | struct btrfs_root_item *ri; | |
1105 | ||
1106 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1107 | return 0; | |
1108 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1109 | return 0; | |
1110 | ||
1111 | path = btrfs_alloc_path(); | |
1112 | BUG_ON(!path); | |
1113 | mutex_lock(&root->fs_info->fs_mutex); | |
1114 | ||
58176a96 JB |
1115 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1116 | dentry->d_name.name, | |
1117 | dentry->d_name.len); | |
39279cc3 CM |
1118 | if (IS_ERR(*sub_root)) |
1119 | return PTR_ERR(*sub_root); | |
1120 | ||
1121 | ri = &(*sub_root)->root_item; | |
1122 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1123 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1124 | location->offset = 0; | |
1125 | ||
1126 | btrfs_free_path(path); | |
1127 | mutex_unlock(&root->fs_info->fs_mutex); | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1132 | { | |
1133 | struct btrfs_iget_args *args = p; | |
1134 | inode->i_ino = args->ino; | |
1135 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
1136 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1137 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1138 | return 0; |
1139 | } | |
1140 | ||
1141 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1142 | { | |
1143 | struct btrfs_iget_args *args = opaque; | |
1144 | return (args->ino == inode->i_ino && | |
1145 | args->root == BTRFS_I(inode)->root); | |
1146 | } | |
1147 | ||
dc17ff8f CM |
1148 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1149 | u64 root_objectid) | |
1150 | { | |
1151 | struct btrfs_iget_args args; | |
1152 | args.ino = objectid; | |
1153 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1154 | ||
1155 | if (!args.root) | |
1156 | return NULL; | |
1157 | ||
1158 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1159 | } | |
1160 | ||
39279cc3 CM |
1161 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1162 | struct btrfs_root *root) | |
1163 | { | |
1164 | struct inode *inode; | |
1165 | struct btrfs_iget_args args; | |
1166 | args.ino = objectid; | |
1167 | args.root = root; | |
1168 | ||
1169 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1170 | btrfs_init_locked_inode, | |
1171 | (void *)&args); | |
1172 | return inode; | |
1173 | } | |
1174 | ||
1175 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1176 | struct nameidata *nd) | |
1177 | { | |
1178 | struct inode * inode; | |
1179 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1180 | struct btrfs_root *root = bi->root; | |
1181 | struct btrfs_root *sub_root = root; | |
1182 | struct btrfs_key location; | |
1183 | int ret; | |
1184 | ||
1185 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1186 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1187 | |
39279cc3 CM |
1188 | mutex_lock(&root->fs_info->fs_mutex); |
1189 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1190 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1191 | |
39279cc3 CM |
1192 | if (ret < 0) |
1193 | return ERR_PTR(ret); | |
5f39d397 | 1194 | |
39279cc3 CM |
1195 | inode = NULL; |
1196 | if (location.objectid) { | |
58176a96 JB |
1197 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1198 | dentry); | |
39279cc3 CM |
1199 | if (ret < 0) |
1200 | return ERR_PTR(ret); | |
1201 | if (ret > 0) | |
1202 | return ERR_PTR(-ENOENT); | |
1203 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1204 | sub_root); | |
1205 | if (!inode) | |
1206 | return ERR_PTR(-EACCES); | |
1207 | if (inode->i_state & I_NEW) { | |
1208 | /* the inode and parent dir are two different roots */ | |
1209 | if (sub_root != root) { | |
1210 | igrab(inode); | |
1211 | sub_root->inode = inode; | |
1212 | } | |
1213 | BTRFS_I(inode)->root = sub_root; | |
1214 | memcpy(&BTRFS_I(inode)->location, &location, | |
1215 | sizeof(location)); | |
1216 | btrfs_read_locked_inode(inode); | |
1217 | unlock_new_inode(inode); | |
1218 | } | |
1219 | } | |
1220 | return d_splice_alias(inode, dentry); | |
1221 | } | |
1222 | ||
39279cc3 CM |
1223 | static unsigned char btrfs_filetype_table[] = { |
1224 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1225 | }; | |
1226 | ||
1227 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1228 | { | |
6da6abae | 1229 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1230 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1231 | struct btrfs_item *item; | |
1232 | struct btrfs_dir_item *di; | |
1233 | struct btrfs_key key; | |
5f39d397 | 1234 | struct btrfs_key found_key; |
39279cc3 CM |
1235 | struct btrfs_path *path; |
1236 | int ret; | |
1237 | u32 nritems; | |
5f39d397 | 1238 | struct extent_buffer *leaf; |
39279cc3 CM |
1239 | int slot; |
1240 | int advance; | |
1241 | unsigned char d_type; | |
1242 | int over = 0; | |
1243 | u32 di_cur; | |
1244 | u32 di_total; | |
1245 | u32 di_len; | |
1246 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1247 | char tmp_name[32]; |
1248 | char *name_ptr; | |
1249 | int name_len; | |
39279cc3 CM |
1250 | |
1251 | /* FIXME, use a real flag for deciding about the key type */ | |
1252 | if (root->fs_info->tree_root == root) | |
1253 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1254 | |
3954401f CM |
1255 | /* special case for "." */ |
1256 | if (filp->f_pos == 0) { | |
1257 | over = filldir(dirent, ".", 1, | |
1258 | 1, inode->i_ino, | |
1259 | DT_DIR); | |
1260 | if (over) | |
1261 | return 0; | |
1262 | filp->f_pos = 1; | |
1263 | } | |
1264 | ||
39279cc3 CM |
1265 | mutex_lock(&root->fs_info->fs_mutex); |
1266 | key.objectid = inode->i_ino; | |
3954401f CM |
1267 | path = btrfs_alloc_path(); |
1268 | path->reada = 2; | |
1269 | ||
1270 | /* special case for .., just use the back ref */ | |
1271 | if (filp->f_pos == 1) { | |
1272 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1273 | key.offset = 0; | |
1274 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1275 | BUG_ON(ret == 0); | |
1276 | leaf = path->nodes[0]; | |
1277 | slot = path->slots[0]; | |
1278 | nritems = btrfs_header_nritems(leaf); | |
1279 | if (slot >= nritems) { | |
1280 | btrfs_release_path(root, path); | |
1281 | goto read_dir_items; | |
1282 | } | |
1283 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1284 | btrfs_release_path(root, path); | |
1285 | if (found_key.objectid != key.objectid || | |
1286 | found_key.type != BTRFS_INODE_REF_KEY) | |
1287 | goto read_dir_items; | |
1288 | over = filldir(dirent, "..", 2, | |
1289 | 2, found_key.offset, DT_DIR); | |
1290 | if (over) | |
1291 | goto nopos; | |
1292 | filp->f_pos = 2; | |
1293 | } | |
1294 | ||
1295 | read_dir_items: | |
39279cc3 CM |
1296 | btrfs_set_key_type(&key, key_type); |
1297 | key.offset = filp->f_pos; | |
5f39d397 | 1298 | |
39279cc3 CM |
1299 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1300 | if (ret < 0) | |
1301 | goto err; | |
1302 | advance = 0; | |
39279cc3 | 1303 | while(1) { |
5f39d397 CM |
1304 | leaf = path->nodes[0]; |
1305 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1306 | slot = path->slots[0]; |
1307 | if (advance || slot >= nritems) { | |
1308 | if (slot >= nritems -1) { | |
39279cc3 CM |
1309 | ret = btrfs_next_leaf(root, path); |
1310 | if (ret) | |
1311 | break; | |
5f39d397 CM |
1312 | leaf = path->nodes[0]; |
1313 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1314 | slot = path->slots[0]; |
1315 | } else { | |
1316 | slot++; | |
1317 | path->slots[0]++; | |
1318 | } | |
1319 | } | |
1320 | advance = 1; | |
5f39d397 CM |
1321 | item = btrfs_item_nr(leaf, slot); |
1322 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1323 | ||
1324 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1325 | break; |
5f39d397 | 1326 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1327 | break; |
5f39d397 | 1328 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1329 | continue; |
5f39d397 CM |
1330 | |
1331 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1332 | advance = 1; |
1333 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1334 | di_cur = 0; | |
5f39d397 | 1335 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1336 | while(di_cur < di_total) { |
5f39d397 CM |
1337 | struct btrfs_key location; |
1338 | ||
1339 | name_len = btrfs_dir_name_len(leaf, di); | |
1340 | if (name_len < 32) { | |
1341 | name_ptr = tmp_name; | |
1342 | } else { | |
1343 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1344 | BUG_ON(!name_ptr); | |
1345 | } | |
1346 | read_extent_buffer(leaf, name_ptr, | |
1347 | (unsigned long)(di + 1), name_len); | |
1348 | ||
1349 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1350 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1351 | over = filldir(dirent, name_ptr, name_len, |
1352 | found_key.offset, | |
1353 | location.objectid, | |
39279cc3 | 1354 | d_type); |
5f39d397 CM |
1355 | |
1356 | if (name_ptr != tmp_name) | |
1357 | kfree(name_ptr); | |
1358 | ||
39279cc3 CM |
1359 | if (over) |
1360 | goto nopos; | |
5103e947 JB |
1361 | di_len = btrfs_dir_name_len(leaf, di) + |
1362 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1363 | di_cur += di_len; |
1364 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1365 | } | |
1366 | } | |
1367 | filp->f_pos++; | |
1368 | nopos: | |
1369 | ret = 0; | |
1370 | err: | |
1371 | btrfs_release_path(root, path); | |
1372 | btrfs_free_path(path); | |
1373 | mutex_unlock(&root->fs_info->fs_mutex); | |
1374 | return ret; | |
1375 | } | |
1376 | ||
1377 | int btrfs_write_inode(struct inode *inode, int wait) | |
1378 | { | |
1379 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1380 | struct btrfs_trans_handle *trans; | |
1381 | int ret = 0; | |
1382 | ||
1383 | if (wait) { | |
1384 | mutex_lock(&root->fs_info->fs_mutex); | |
1385 | trans = btrfs_start_transaction(root, 1); | |
1386 | btrfs_set_trans_block_group(trans, inode); | |
1387 | ret = btrfs_commit_transaction(trans, root); | |
1388 | mutex_unlock(&root->fs_info->fs_mutex); | |
1389 | } | |
1390 | return ret; | |
1391 | } | |
1392 | ||
1393 | /* | |
54aa1f4d | 1394 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1395 | * inode changes. But, it is most likely to find the inode in cache. |
1396 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1397 | * to keep or drop this code. | |
1398 | */ | |
1399 | void btrfs_dirty_inode(struct inode *inode) | |
1400 | { | |
1401 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1402 | struct btrfs_trans_handle *trans; | |
1403 | ||
1404 | mutex_lock(&root->fs_info->fs_mutex); | |
1405 | trans = btrfs_start_transaction(root, 1); | |
1406 | btrfs_set_trans_block_group(trans, inode); | |
1407 | btrfs_update_inode(trans, root, inode); | |
1408 | btrfs_end_transaction(trans, root); | |
1409 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1410 | } |
1411 | ||
1412 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1413 | struct btrfs_root *root, | |
1414 | u64 objectid, | |
1415 | struct btrfs_block_group_cache *group, | |
1416 | int mode) | |
1417 | { | |
1418 | struct inode *inode; | |
5f39d397 | 1419 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1420 | struct btrfs_key *location; |
5f39d397 | 1421 | struct btrfs_path *path; |
39279cc3 CM |
1422 | int ret; |
1423 | int owner; | |
1424 | ||
5f39d397 CM |
1425 | path = btrfs_alloc_path(); |
1426 | BUG_ON(!path); | |
1427 | ||
39279cc3 CM |
1428 | inode = new_inode(root->fs_info->sb); |
1429 | if (!inode) | |
1430 | return ERR_PTR(-ENOMEM); | |
1431 | ||
b888db2b CM |
1432 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1433 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1434 | BTRFS_I(inode)->root = root; |
b888db2b | 1435 | |
39279cc3 CM |
1436 | if (mode & S_IFDIR) |
1437 | owner = 0; | |
1438 | else | |
1439 | owner = 1; | |
1440 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1441 | BTRFS_I(inode)->block_group = group; | |
1442 | ||
5f39d397 CM |
1443 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1444 | if (ret) | |
1445 | goto fail; | |
1446 | ||
39279cc3 CM |
1447 | inode->i_uid = current->fsuid; |
1448 | inode->i_gid = current->fsgid; | |
1449 | inode->i_mode = mode; | |
1450 | inode->i_ino = objectid; | |
1451 | inode->i_blocks = 0; | |
1452 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1453 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1454 | struct btrfs_inode_item); | |
1455 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1456 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1457 | btrfs_free_path(path); | |
1458 | ||
39279cc3 CM |
1459 | location = &BTRFS_I(inode)->location; |
1460 | location->objectid = objectid; | |
39279cc3 CM |
1461 | location->offset = 0; |
1462 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1463 | ||
39279cc3 CM |
1464 | insert_inode_hash(inode); |
1465 | return inode; | |
5f39d397 CM |
1466 | fail: |
1467 | btrfs_free_path(path); | |
1468 | return ERR_PTR(ret); | |
39279cc3 CM |
1469 | } |
1470 | ||
1471 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1472 | { | |
1473 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1474 | } | |
1475 | ||
1476 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1477 | struct dentry *dentry, struct inode *inode) | |
1478 | { | |
1479 | int ret; | |
1480 | struct btrfs_key key; | |
1481 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1482 | struct inode *parent_inode; |
5f39d397 | 1483 | |
39279cc3 | 1484 | key.objectid = inode->i_ino; |
39279cc3 CM |
1485 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1486 | key.offset = 0; | |
1487 | ||
1488 | ret = btrfs_insert_dir_item(trans, root, | |
1489 | dentry->d_name.name, dentry->d_name.len, | |
1490 | dentry->d_parent->d_inode->i_ino, | |
1491 | &key, btrfs_inode_type(inode)); | |
1492 | if (ret == 0) { | |
76fea00a CM |
1493 | ret = btrfs_insert_inode_ref(trans, root, |
1494 | dentry->d_name.name, | |
1495 | dentry->d_name.len, | |
1496 | inode->i_ino, | |
1497 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1498 | parent_inode = dentry->d_parent->d_inode; |
1499 | parent_inode->i_size += dentry->d_name.len * 2; | |
1500 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1501 | ret = btrfs_update_inode(trans, root, |
1502 | dentry->d_parent->d_inode); | |
1503 | } | |
1504 | return ret; | |
1505 | } | |
1506 | ||
1507 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1508 | struct dentry *dentry, struct inode *inode) | |
1509 | { | |
1510 | int err = btrfs_add_link(trans, dentry, inode); | |
1511 | if (!err) { | |
1512 | d_instantiate(dentry, inode); | |
1513 | return 0; | |
1514 | } | |
1515 | if (err > 0) | |
1516 | err = -EEXIST; | |
1517 | return err; | |
1518 | } | |
1519 | ||
618e21d5 JB |
1520 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1521 | int mode, dev_t rdev) | |
1522 | { | |
1523 | struct btrfs_trans_handle *trans; | |
1524 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1525 | struct inode *inode = NULL; |
618e21d5 JB |
1526 | int err; |
1527 | int drop_inode = 0; | |
1528 | u64 objectid; | |
1832a6d5 | 1529 | unsigned long nr = 0; |
618e21d5 JB |
1530 | |
1531 | if (!new_valid_dev(rdev)) | |
1532 | return -EINVAL; | |
1533 | ||
1534 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1535 | err = btrfs_check_free_space(root, 1, 0); |
1536 | if (err) | |
1537 | goto fail; | |
1538 | ||
618e21d5 JB |
1539 | trans = btrfs_start_transaction(root, 1); |
1540 | btrfs_set_trans_block_group(trans, dir); | |
1541 | ||
1542 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1543 | if (err) { | |
1544 | err = -ENOSPC; | |
1545 | goto out_unlock; | |
1546 | } | |
1547 | ||
1548 | inode = btrfs_new_inode(trans, root, objectid, | |
1549 | BTRFS_I(dir)->block_group, mode); | |
1550 | err = PTR_ERR(inode); | |
1551 | if (IS_ERR(inode)) | |
1552 | goto out_unlock; | |
1553 | ||
1554 | btrfs_set_trans_block_group(trans, inode); | |
1555 | err = btrfs_add_nondir(trans, dentry, inode); | |
1556 | if (err) | |
1557 | drop_inode = 1; | |
1558 | else { | |
1559 | inode->i_op = &btrfs_special_inode_operations; | |
1560 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1561 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1562 | } |
1563 | dir->i_sb->s_dirt = 1; | |
1564 | btrfs_update_inode_block_group(trans, inode); | |
1565 | btrfs_update_inode_block_group(trans, dir); | |
1566 | out_unlock: | |
d3c2fdcf | 1567 | nr = trans->blocks_used; |
618e21d5 | 1568 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1569 | fail: |
618e21d5 JB |
1570 | mutex_unlock(&root->fs_info->fs_mutex); |
1571 | ||
1572 | if (drop_inode) { | |
1573 | inode_dec_link_count(inode); | |
1574 | iput(inode); | |
1575 | } | |
d3c2fdcf | 1576 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1577 | return err; |
1578 | } | |
1579 | ||
39279cc3 CM |
1580 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1581 | int mode, struct nameidata *nd) | |
1582 | { | |
1583 | struct btrfs_trans_handle *trans; | |
1584 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1585 | struct inode *inode = NULL; |
39279cc3 CM |
1586 | int err; |
1587 | int drop_inode = 0; | |
1832a6d5 | 1588 | unsigned long nr = 0; |
39279cc3 CM |
1589 | u64 objectid; |
1590 | ||
1591 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1592 | err = btrfs_check_free_space(root, 1, 0); |
1593 | if (err) | |
1594 | goto fail; | |
39279cc3 CM |
1595 | trans = btrfs_start_transaction(root, 1); |
1596 | btrfs_set_trans_block_group(trans, dir); | |
1597 | ||
1598 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1599 | if (err) { | |
1600 | err = -ENOSPC; | |
1601 | goto out_unlock; | |
1602 | } | |
1603 | ||
1604 | inode = btrfs_new_inode(trans, root, objectid, | |
1605 | BTRFS_I(dir)->block_group, mode); | |
1606 | err = PTR_ERR(inode); | |
1607 | if (IS_ERR(inode)) | |
1608 | goto out_unlock; | |
1609 | ||
1610 | btrfs_set_trans_block_group(trans, inode); | |
1611 | err = btrfs_add_nondir(trans, dentry, inode); | |
1612 | if (err) | |
1613 | drop_inode = 1; | |
1614 | else { | |
1615 | inode->i_mapping->a_ops = &btrfs_aops; | |
1616 | inode->i_fop = &btrfs_file_operations; | |
1617 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1618 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1619 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1620 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1621 | } |
1622 | dir->i_sb->s_dirt = 1; | |
1623 | btrfs_update_inode_block_group(trans, inode); | |
1624 | btrfs_update_inode_block_group(trans, dir); | |
1625 | out_unlock: | |
d3c2fdcf | 1626 | nr = trans->blocks_used; |
39279cc3 | 1627 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1628 | fail: |
39279cc3 CM |
1629 | mutex_unlock(&root->fs_info->fs_mutex); |
1630 | ||
1631 | if (drop_inode) { | |
1632 | inode_dec_link_count(inode); | |
1633 | iput(inode); | |
1634 | } | |
d3c2fdcf | 1635 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1636 | return err; |
1637 | } | |
1638 | ||
1639 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1640 | struct dentry *dentry) | |
1641 | { | |
1642 | struct btrfs_trans_handle *trans; | |
1643 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1644 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1645 | unsigned long nr = 0; |
39279cc3 CM |
1646 | int err; |
1647 | int drop_inode = 0; | |
1648 | ||
1649 | if (inode->i_nlink == 0) | |
1650 | return -ENOENT; | |
1651 | ||
6da6abae CM |
1652 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1653 | inode->i_nlink++; | |
1654 | #else | |
39279cc3 | 1655 | inc_nlink(inode); |
6da6abae | 1656 | #endif |
39279cc3 | 1657 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1658 | err = btrfs_check_free_space(root, 1, 0); |
1659 | if (err) | |
1660 | goto fail; | |
39279cc3 | 1661 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1662 | |
39279cc3 CM |
1663 | btrfs_set_trans_block_group(trans, dir); |
1664 | atomic_inc(&inode->i_count); | |
1665 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1666 | |
39279cc3 CM |
1667 | if (err) |
1668 | drop_inode = 1; | |
5f39d397 | 1669 | |
39279cc3 CM |
1670 | dir->i_sb->s_dirt = 1; |
1671 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1672 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1673 | |
54aa1f4d CM |
1674 | if (err) |
1675 | drop_inode = 1; | |
39279cc3 | 1676 | |
d3c2fdcf | 1677 | nr = trans->blocks_used; |
39279cc3 | 1678 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1679 | fail: |
39279cc3 CM |
1680 | mutex_unlock(&root->fs_info->fs_mutex); |
1681 | ||
1682 | if (drop_inode) { | |
1683 | inode_dec_link_count(inode); | |
1684 | iput(inode); | |
1685 | } | |
d3c2fdcf | 1686 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1687 | return err; |
1688 | } | |
1689 | ||
39279cc3 CM |
1690 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1691 | { | |
1692 | struct inode *inode; | |
1693 | struct btrfs_trans_handle *trans; | |
1694 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1695 | int err = 0; | |
1696 | int drop_on_err = 0; | |
1697 | u64 objectid; | |
d3c2fdcf | 1698 | unsigned long nr = 1; |
39279cc3 CM |
1699 | |
1700 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1701 | err = btrfs_check_free_space(root, 1, 0); |
1702 | if (err) | |
1703 | goto out_unlock; | |
1704 | ||
39279cc3 CM |
1705 | trans = btrfs_start_transaction(root, 1); |
1706 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1707 | |
39279cc3 CM |
1708 | if (IS_ERR(trans)) { |
1709 | err = PTR_ERR(trans); | |
1710 | goto out_unlock; | |
1711 | } | |
1712 | ||
1713 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1714 | if (err) { | |
1715 | err = -ENOSPC; | |
1716 | goto out_unlock; | |
1717 | } | |
1718 | ||
1719 | inode = btrfs_new_inode(trans, root, objectid, | |
1720 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1721 | if (IS_ERR(inode)) { | |
1722 | err = PTR_ERR(inode); | |
1723 | goto out_fail; | |
1724 | } | |
5f39d397 | 1725 | |
39279cc3 CM |
1726 | drop_on_err = 1; |
1727 | inode->i_op = &btrfs_dir_inode_operations; | |
1728 | inode->i_fop = &btrfs_dir_file_operations; | |
1729 | btrfs_set_trans_block_group(trans, inode); | |
1730 | ||
3954401f | 1731 | inode->i_size = 0; |
39279cc3 CM |
1732 | err = btrfs_update_inode(trans, root, inode); |
1733 | if (err) | |
1734 | goto out_fail; | |
5f39d397 | 1735 | |
39279cc3 CM |
1736 | err = btrfs_add_link(trans, dentry, inode); |
1737 | if (err) | |
1738 | goto out_fail; | |
5f39d397 | 1739 | |
39279cc3 CM |
1740 | d_instantiate(dentry, inode); |
1741 | drop_on_err = 0; | |
1742 | dir->i_sb->s_dirt = 1; | |
1743 | btrfs_update_inode_block_group(trans, inode); | |
1744 | btrfs_update_inode_block_group(trans, dir); | |
1745 | ||
1746 | out_fail: | |
d3c2fdcf | 1747 | nr = trans->blocks_used; |
39279cc3 | 1748 | btrfs_end_transaction(trans, root); |
5f39d397 | 1749 | |
39279cc3 CM |
1750 | out_unlock: |
1751 | mutex_unlock(&root->fs_info->fs_mutex); | |
1752 | if (drop_on_err) | |
1753 | iput(inode); | |
d3c2fdcf | 1754 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1755 | return err; |
1756 | } | |
1757 | ||
a52d9a80 CM |
1758 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1759 | size_t page_offset, u64 start, u64 end, | |
1760 | int create) | |
1761 | { | |
1762 | int ret; | |
1763 | int err = 0; | |
db94535d | 1764 | u64 bytenr; |
a52d9a80 CM |
1765 | u64 extent_start = 0; |
1766 | u64 extent_end = 0; | |
1767 | u64 objectid = inode->i_ino; | |
1768 | u32 found_type; | |
1769 | int failed_insert = 0; | |
1770 | struct btrfs_path *path; | |
1771 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1772 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1773 | struct extent_buffer *leaf; |
1774 | struct btrfs_key found_key; | |
a52d9a80 CM |
1775 | struct extent_map *em = NULL; |
1776 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1777 | struct btrfs_trans_handle *trans = NULL; | |
1778 | ||
1779 | path = btrfs_alloc_path(); | |
1780 | BUG_ON(!path); | |
1781 | mutex_lock(&root->fs_info->fs_mutex); | |
1782 | ||
1783 | again: | |
1784 | em = lookup_extent_mapping(em_tree, start, end); | |
1785 | if (em) { | |
56b453c9 CM |
1786 | if (em->start > start) { |
1787 | printk("get_extent start %Lu em start %Lu\n", | |
1788 | start, em->start); | |
1789 | WARN_ON(1); | |
1790 | } | |
a52d9a80 CM |
1791 | goto out; |
1792 | } | |
1793 | if (!em) { | |
1794 | em = alloc_extent_map(GFP_NOFS); | |
1795 | if (!em) { | |
1796 | err = -ENOMEM; | |
1797 | goto out; | |
1798 | } | |
5f39d397 CM |
1799 | em->start = EXTENT_MAP_HOLE; |
1800 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1801 | } |
1802 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1803 | ret = btrfs_lookup_file_extent(trans, root, path, |
1804 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1805 | if (ret < 0) { |
1806 | err = ret; | |
1807 | goto out; | |
1808 | } | |
1809 | ||
1810 | if (ret != 0) { | |
1811 | if (path->slots[0] == 0) | |
1812 | goto not_found; | |
1813 | path->slots[0]--; | |
1814 | } | |
1815 | ||
5f39d397 CM |
1816 | leaf = path->nodes[0]; |
1817 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1818 | struct btrfs_file_extent_item); |
a52d9a80 | 1819 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1820 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1821 | found_type = btrfs_key_type(&found_key); | |
1822 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1823 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1824 | goto not_found; | |
1825 | } | |
1826 | ||
5f39d397 CM |
1827 | found_type = btrfs_file_extent_type(leaf, item); |
1828 | extent_start = found_key.offset; | |
a52d9a80 CM |
1829 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1830 | extent_end = extent_start + | |
db94535d | 1831 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1832 | err = 0; |
b888db2b | 1833 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1834 | em->start = start; |
1835 | if (start < extent_start) { | |
b888db2b CM |
1836 | if (end < extent_start) |
1837 | goto not_found; | |
a52d9a80 CM |
1838 | em->end = extent_end - 1; |
1839 | } else { | |
1840 | em->end = end; | |
1841 | } | |
1842 | goto not_found_em; | |
1843 | } | |
db94535d CM |
1844 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1845 | if (bytenr == 0) { | |
a52d9a80 CM |
1846 | em->start = extent_start; |
1847 | em->end = extent_end - 1; | |
5f39d397 CM |
1848 | em->block_start = EXTENT_MAP_HOLE; |
1849 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1850 | goto insert; |
1851 | } | |
db94535d CM |
1852 | bytenr += btrfs_file_extent_offset(leaf, item); |
1853 | em->block_start = bytenr; | |
a52d9a80 | 1854 | em->block_end = em->block_start + |
db94535d | 1855 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1856 | em->start = extent_start; |
1857 | em->end = extent_end - 1; | |
1858 | goto insert; | |
1859 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1860 | unsigned long ptr; |
a52d9a80 | 1861 | char *map; |
3326d1b0 CM |
1862 | size_t size; |
1863 | size_t extent_offset; | |
1864 | size_t copy_size; | |
a52d9a80 | 1865 | |
5f39d397 CM |
1866 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1867 | path->slots[0])); | |
689f9346 | 1868 | extent_end = (extent_start + size - 1) | |
db94535d | 1869 | ((u64)root->sectorsize - 1); |
b888db2b | 1870 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1871 | em->start = start; |
1872 | if (start < extent_start) { | |
b888db2b CM |
1873 | if (end < extent_start) |
1874 | goto not_found; | |
50b78c24 | 1875 | em->end = extent_end; |
a52d9a80 CM |
1876 | } else { |
1877 | em->end = end; | |
1878 | } | |
1879 | goto not_found_em; | |
1880 | } | |
689f9346 Y |
1881 | em->block_start = EXTENT_MAP_INLINE; |
1882 | em->block_end = EXTENT_MAP_INLINE; | |
1883 | ||
1884 | if (!page) { | |
1885 | em->start = extent_start; | |
1886 | em->end = extent_start + size - 1; | |
1887 | goto out; | |
1888 | } | |
5f39d397 | 1889 | |
35ebb934 | 1890 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1891 | extent_start + page_offset; |
ae2f5411 | 1892 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1893 | size - extent_offset); |
3326d1b0 CM |
1894 | em->start = extent_start + extent_offset; |
1895 | em->end = (em->start + copy_size -1) | | |
1896 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1897 | map = kmap(page); |
1898 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1899 | if (create == 0 && !PageUptodate(page)) { |
1900 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1901 | copy_size); | |
1902 | flush_dcache_page(page); | |
1903 | } else if (create && PageUptodate(page)) { | |
1904 | if (!trans) { | |
1905 | kunmap(page); | |
1906 | free_extent_map(em); | |
1907 | em = NULL; | |
1908 | btrfs_release_path(root, path); | |
1909 | trans = btrfs_start_transaction(root, 1); | |
1910 | goto again; | |
1911 | } | |
1912 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1913 | copy_size); | |
1914 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1915 | } |
a52d9a80 | 1916 | kunmap(page); |
3326d1b0 | 1917 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1918 | goto insert; |
1919 | } else { | |
1920 | printk("unkknown found_type %d\n", found_type); | |
1921 | WARN_ON(1); | |
1922 | } | |
1923 | not_found: | |
1924 | em->start = start; | |
1925 | em->end = end; | |
1926 | not_found_em: | |
5f39d397 CM |
1927 | em->block_start = EXTENT_MAP_HOLE; |
1928 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1929 | insert: |
1930 | btrfs_release_path(root, path); | |
1931 | if (em->start > start || em->end < start) { | |
b888db2b | 1932 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1933 | err = -EIO; |
1934 | goto out; | |
1935 | } | |
1936 | ret = add_extent_mapping(em_tree, em); | |
1937 | if (ret == -EEXIST) { | |
1938 | free_extent_map(em); | |
2bf5a725 | 1939 | em = NULL; |
6da6abae CM |
1940 | if (0 && failed_insert == 1) { |
1941 | btrfs_drop_extent_cache(inode, start, end); | |
1942 | } | |
a52d9a80 CM |
1943 | failed_insert++; |
1944 | if (failed_insert > 5) { | |
1945 | printk("failing to insert %Lu %Lu\n", start, end); | |
1946 | err = -EIO; | |
1947 | goto out; | |
1948 | } | |
a52d9a80 CM |
1949 | goto again; |
1950 | } | |
1951 | err = 0; | |
1952 | out: | |
1953 | btrfs_free_path(path); | |
1954 | if (trans) { | |
1955 | ret = btrfs_end_transaction(trans, root); | |
1956 | if (!err) | |
1957 | err = ret; | |
1958 | } | |
1959 | mutex_unlock(&root->fs_info->fs_mutex); | |
1960 | if (err) { | |
1961 | free_extent_map(em); | |
1962 | WARN_ON(1); | |
1963 | return ERR_PTR(err); | |
1964 | } | |
1965 | return em; | |
1966 | } | |
1967 | ||
d396c6f5 | 1968 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1969 | { |
d396c6f5 | 1970 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1971 | } |
1972 | ||
a52d9a80 | 1973 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1974 | { |
a52d9a80 CM |
1975 | struct extent_map_tree *tree; |
1976 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1977 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1978 | } |
1832a6d5 | 1979 | |
a52d9a80 | 1980 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1981 | { |
a52d9a80 | 1982 | struct extent_map_tree *tree; |
b888db2b CM |
1983 | |
1984 | ||
1985 | if (current->flags & PF_MEMALLOC) { | |
1986 | redirty_page_for_writepage(wbc, page); | |
1987 | unlock_page(page); | |
1988 | return 0; | |
1989 | } | |
a52d9a80 CM |
1990 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1991 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1992 | } |
1993 | ||
b293f02e CM |
1994 | static int btrfs_writepages(struct address_space *mapping, |
1995 | struct writeback_control *wbc) | |
1996 | { | |
1997 | struct extent_map_tree *tree; | |
1998 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1999 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
2000 | } | |
2001 | ||
3ab2fb5a CM |
2002 | static int |
2003 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2004 | struct list_head *pages, unsigned nr_pages) | |
2005 | { | |
2006 | struct extent_map_tree *tree; | |
2007 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
2008 | return extent_readpages(tree, mapping, pages, nr_pages, | |
2009 | btrfs_get_extent); | |
2010 | } | |
2011 | ||
a52d9a80 | 2012 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 2013 | { |
a52d9a80 CM |
2014 | struct extent_map_tree *tree; |
2015 | int ret; | |
8c2383c3 | 2016 | |
a52d9a80 CM |
2017 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2018 | ret = try_release_extent_mapping(tree, page); | |
2019 | if (ret == 1) { | |
2020 | ClearPagePrivate(page); | |
2021 | set_page_private(page, 0); | |
2022 | page_cache_release(page); | |
39279cc3 | 2023 | } |
a52d9a80 | 2024 | return ret; |
39279cc3 CM |
2025 | } |
2026 | ||
a52d9a80 | 2027 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2028 | { |
a52d9a80 | 2029 | struct extent_map_tree *tree; |
39279cc3 | 2030 | |
a52d9a80 CM |
2031 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2032 | extent_invalidatepage(tree, page, offset); | |
2033 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2034 | } |
2035 | ||
9ebefb18 CM |
2036 | /* |
2037 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2038 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2039 | * be careful to check for EOF conditions here. We set the page up correctly | |
2040 | * for a written page which means we get ENOSPC checking when writing into | |
2041 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2042 | * support these features. | |
2043 | * | |
2044 | * We are not allowed to take the i_mutex here so we have to play games to | |
2045 | * protect against truncate races as the page could now be beyond EOF. Because | |
2046 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2047 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2048 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2049 | * unlock the page. | |
2050 | */ | |
2051 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2052 | { | |
6da6abae | 2053 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2054 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2055 | unsigned long end; |
2056 | loff_t size; | |
1832a6d5 | 2057 | int ret; |
a52d9a80 | 2058 | u64 page_start; |
9ebefb18 | 2059 | |
1832a6d5 CM |
2060 | mutex_lock(&root->fs_info->fs_mutex); |
2061 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2062 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2063 | if (ret) |
2064 | goto out; | |
2065 | ||
2066 | ret = -EINVAL; | |
2067 | ||
9ebefb18 CM |
2068 | lock_page(page); |
2069 | wait_on_page_writeback(page); | |
9ebefb18 | 2070 | size = i_size_read(inode); |
35ebb934 | 2071 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2072 | |
9ebefb18 | 2073 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2074 | (page_start > size)) { |
9ebefb18 CM |
2075 | /* page got truncated out from underneath us */ |
2076 | goto out_unlock; | |
2077 | } | |
2078 | ||
2079 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2080 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2081 | end = size & ~PAGE_CACHE_MASK; |
2082 | else | |
2083 | end = PAGE_CACHE_SIZE; | |
2084 | ||
b888db2b | 2085 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2086 | |
2087 | out_unlock: | |
2088 | unlock_page(page); | |
1832a6d5 | 2089 | out: |
9ebefb18 CM |
2090 | return ret; |
2091 | } | |
2092 | ||
39279cc3 CM |
2093 | static void btrfs_truncate(struct inode *inode) |
2094 | { | |
2095 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2096 | int ret; | |
2097 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2098 | unsigned long nr; |
39279cc3 CM |
2099 | |
2100 | if (!S_ISREG(inode->i_mode)) | |
2101 | return; | |
2102 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2103 | return; | |
2104 | ||
2105 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2106 | ||
2107 | mutex_lock(&root->fs_info->fs_mutex); | |
2108 | trans = btrfs_start_transaction(root, 1); | |
2109 | btrfs_set_trans_block_group(trans, inode); | |
2110 | ||
2111 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
2112 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 2113 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2114 | nr = trans->blocks_used; |
5f39d397 | 2115 | |
39279cc3 CM |
2116 | ret = btrfs_end_transaction(trans, root); |
2117 | BUG_ON(ret); | |
2118 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2119 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2120 | } |
2121 | ||
4313b399 CM |
2122 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2123 | int namelen) | |
39279cc3 CM |
2124 | { |
2125 | struct btrfs_trans_handle *trans; | |
2126 | struct btrfs_key key; | |
2127 | struct btrfs_root_item root_item; | |
2128 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2129 | struct extent_buffer *leaf; |
dc17ff8f | 2130 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2131 | struct inode *inode; |
2132 | struct inode *dir; | |
2133 | int ret; | |
54aa1f4d | 2134 | int err; |
39279cc3 CM |
2135 | u64 objectid; |
2136 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2137 | unsigned long nr = 1; |
39279cc3 CM |
2138 | |
2139 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2140 | ret = btrfs_check_free_space(root, 1, 0); |
2141 | if (ret) | |
2142 | goto fail_commit; | |
2143 | ||
39279cc3 CM |
2144 | trans = btrfs_start_transaction(root, 1); |
2145 | BUG_ON(!trans); | |
2146 | ||
7bb86316 CM |
2147 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2148 | 0, &objectid); | |
2149 | if (ret) | |
2150 | goto fail; | |
2151 | ||
2152 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2153 | objectid, trans->transid, 0, 0, | |
2154 | 0, 0); | |
5f39d397 CM |
2155 | if (IS_ERR(leaf)) |
2156 | return PTR_ERR(leaf); | |
2157 | ||
2158 | btrfs_set_header_nritems(leaf, 0); | |
2159 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2160 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2161 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2162 | btrfs_set_header_owner(leaf, objectid); |
2163 | ||
5f39d397 CM |
2164 | write_extent_buffer(leaf, root->fs_info->fsid, |
2165 | (unsigned long)btrfs_header_fsid(leaf), | |
2166 | BTRFS_FSID_SIZE); | |
2167 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2168 | |
2169 | inode_item = &root_item.inode; | |
2170 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2171 | inode_item->generation = cpu_to_le64(1); |
2172 | inode_item->size = cpu_to_le64(3); | |
2173 | inode_item->nlink = cpu_to_le32(1); | |
2174 | inode_item->nblocks = cpu_to_le64(1); | |
2175 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2176 | |
db94535d CM |
2177 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2178 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2179 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2180 | btrfs_set_root_used(&root_item, 0); |
2181 | ||
5eda7b5e CM |
2182 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2183 | root_item.drop_level = 0; | |
5f39d397 CM |
2184 | |
2185 | free_extent_buffer(leaf); | |
2186 | leaf = NULL; | |
39279cc3 | 2187 | |
39279cc3 CM |
2188 | btrfs_set_root_dirid(&root_item, new_dirid); |
2189 | ||
2190 | key.objectid = objectid; | |
2191 | key.offset = 1; | |
39279cc3 CM |
2192 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2193 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2194 | &root_item); | |
54aa1f4d CM |
2195 | if (ret) |
2196 | goto fail; | |
39279cc3 CM |
2197 | |
2198 | /* | |
2199 | * insert the directory item | |
2200 | */ | |
2201 | key.offset = (u64)-1; | |
2202 | dir = root->fs_info->sb->s_root->d_inode; | |
2203 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2204 | name, namelen, dir->i_ino, &key, | |
2205 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2206 | if (ret) |
2207 | goto fail; | |
39279cc3 | 2208 | |
3954401f CM |
2209 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2210 | name, namelen, objectid, | |
2211 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2212 | if (ret) | |
2213 | goto fail; | |
2214 | ||
39279cc3 | 2215 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2216 | if (ret) |
2217 | goto fail_commit; | |
39279cc3 | 2218 | |
58176a96 | 2219 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2220 | BUG_ON(!new_root); |
2221 | ||
2222 | trans = btrfs_start_transaction(new_root, 1); | |
2223 | BUG_ON(!trans); | |
2224 | ||
2225 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2226 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2227 | if (IS_ERR(inode)) |
2228 | goto fail; | |
39279cc3 CM |
2229 | inode->i_op = &btrfs_dir_inode_operations; |
2230 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2231 | new_root->inode = inode; |
39279cc3 | 2232 | |
3954401f CM |
2233 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2234 | new_dirid); | |
39279cc3 | 2235 | inode->i_nlink = 1; |
3954401f | 2236 | inode->i_size = 0; |
39279cc3 | 2237 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2238 | if (ret) |
2239 | goto fail; | |
2240 | fail: | |
d3c2fdcf | 2241 | nr = trans->blocks_used; |
dc17ff8f | 2242 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2243 | if (err && !ret) |
2244 | ret = err; | |
2245 | fail_commit: | |
39279cc3 | 2246 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2247 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2248 | return ret; |
39279cc3 CM |
2249 | } |
2250 | ||
2251 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2252 | { | |
2253 | struct btrfs_trans_handle *trans; | |
2254 | struct btrfs_key key; | |
2255 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2256 | struct extent_buffer *tmp; |
39279cc3 | 2257 | int ret; |
54aa1f4d | 2258 | int err; |
39279cc3 | 2259 | u64 objectid; |
1832a6d5 | 2260 | unsigned long nr = 0; |
39279cc3 CM |
2261 | |
2262 | if (!root->ref_cows) | |
2263 | return -EINVAL; | |
2264 | ||
2265 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2266 | ret = btrfs_check_free_space(root, 1, 0); |
2267 | if (ret) | |
2268 | goto fail_unlock; | |
2269 | ||
39279cc3 CM |
2270 | trans = btrfs_start_transaction(root, 1); |
2271 | BUG_ON(!trans); | |
dc17ff8f CM |
2272 | err = btrfs_commit_transaction(trans, root); |
2273 | ||
2274 | trans = btrfs_start_transaction(root, 1); | |
39279cc3 CM |
2275 | |
2276 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2277 | if (ret) |
2278 | goto fail; | |
39279cc3 CM |
2279 | |
2280 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2281 | 0, &objectid); | |
54aa1f4d | 2282 | if (ret) |
dc17ff8f | 2283 | goto fail; memcpy(&new_root_item, &root->root_item, |
39279cc3 CM |
2284 | sizeof(new_root_item)); |
2285 | ||
2286 | key.objectid = objectid; | |
2287 | key.offset = 1; | |
39279cc3 | 2288 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
be20aa9d | 2289 | |
9691975d | 2290 | extent_buffer_get(root->node); |
83df7c1d | 2291 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2292 | free_extent_buffer(tmp); |
be20aa9d | 2293 | |
dc17ff8f CM |
2294 | /* write the ordered inodes to force all delayed allocations to |
2295 | * be filled. Once this is done, we can copy the root | |
2296 | */ | |
2297 | mutex_lock(&root->fs_info->trans_mutex); | |
2298 | btrfs_write_ordered_inodes(trans, root); | |
2299 | mutex_unlock(&root->fs_info->trans_mutex); | |
2300 | ||
be20aa9d CM |
2301 | btrfs_copy_root(trans, root, root->node, &tmp, objectid); |
2302 | ||
2303 | btrfs_set_root_bytenr(&new_root_item, tmp->start); | |
2304 | btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp)); | |
39279cc3 CM |
2305 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2306 | &new_root_item); | |
dc17ff8f | 2307 | printk("new root %Lu node %Lu\n", objectid, tmp->start); |
be20aa9d | 2308 | free_extent_buffer(tmp); |
54aa1f4d CM |
2309 | if (ret) |
2310 | goto fail; | |
39279cc3 CM |
2311 | |
2312 | /* | |
2313 | * insert the directory item | |
2314 | */ | |
2315 | key.offset = (u64)-1; | |
2316 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2317 | name, namelen, | |
2318 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2319 | &key, BTRFS_FT_DIR); | |
2320 | ||
54aa1f4d CM |
2321 | if (ret) |
2322 | goto fail; | |
39279cc3 | 2323 | |
3954401f CM |
2324 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2325 | name, namelen, objectid, | |
2326 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2327 | ||
2328 | if (ret) | |
2329 | goto fail; | |
54aa1f4d | 2330 | fail: |
d3c2fdcf | 2331 | nr = trans->blocks_used; |
54aa1f4d | 2332 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2333 | |
54aa1f4d CM |
2334 | if (err && !ret) |
2335 | ret = err; | |
1832a6d5 | 2336 | fail_unlock: |
39279cc3 | 2337 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2338 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2339 | return ret; |
39279cc3 CM |
2340 | } |
2341 | ||
edbd8d4e | 2342 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2343 | struct file_ra_state *ra, struct file *file, |
2344 | pgoff_t offset, pgoff_t last_index) | |
2345 | { | |
2346 | pgoff_t req_size; | |
2347 | ||
2348 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2349 | req_size = last_index - offset + 1; | |
2350 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2351 | return offset; | |
2352 | #else | |
2353 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2354 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2355 | return offset + req_size; | |
2356 | #endif | |
2357 | } | |
2358 | ||
2359 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2360 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2361 | struct btrfs_root *root = BTRFS_I(inode)->root; |
86479a04 CM |
2362 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
2363 | struct page *page; | |
2364 | unsigned long last_index; | |
2365 | unsigned long ra_index = 0; | |
2366 | u64 page_start; | |
2367 | u64 page_end; | |
edbd8d4e CM |
2368 | u64 delalloc_start; |
2369 | u64 existing_delalloc; | |
86479a04 | 2370 | unsigned long i; |
1832a6d5 CM |
2371 | int ret; |
2372 | ||
2373 | mutex_lock(&root->fs_info->fs_mutex); | |
2374 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2375 | mutex_unlock(&root->fs_info->fs_mutex); | |
2376 | if (ret) | |
2377 | return -ENOSPC; | |
86479a04 CM |
2378 | |
2379 | mutex_lock(&inode->i_mutex); | |
2380 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2381 | for (i = 0; i <= last_index; i++) { | |
2382 | if (i == ra_index) { | |
edbd8d4e CM |
2383 | ra_index = btrfs_force_ra(inode->i_mapping, |
2384 | &file->f_ra, | |
2385 | file, ra_index, last_index); | |
86479a04 CM |
2386 | } |
2387 | page = grab_cache_page(inode->i_mapping, i); | |
2388 | if (!page) | |
2389 | goto out_unlock; | |
2390 | if (!PageUptodate(page)) { | |
2391 | btrfs_readpage(NULL, page); | |
2392 | lock_page(page); | |
2393 | if (!PageUptodate(page)) { | |
2394 | unlock_page(page); | |
2395 | page_cache_release(page); | |
2396 | goto out_unlock; | |
2397 | } | |
2398 | } | |
35ebb934 | 2399 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2400 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2401 | ||
2402 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
edbd8d4e CM |
2403 | delalloc_start = page_start; |
2404 | existing_delalloc = | |
2405 | count_range_bits(&BTRFS_I(inode)->extent_tree, | |
2406 | &delalloc_start, page_end, | |
2407 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
86479a04 CM |
2408 | set_extent_delalloc(em_tree, page_start, |
2409 | page_end, GFP_NOFS); | |
edbd8d4e CM |
2410 | |
2411 | spin_lock(&root->fs_info->delalloc_lock); | |
2412 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - | |
2413 | existing_delalloc; | |
2414 | spin_unlock(&root->fs_info->delalloc_lock); | |
2415 | ||
86479a04 CM |
2416 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); |
2417 | set_page_dirty(page); | |
2418 | unlock_page(page); | |
2419 | page_cache_release(page); | |
2420 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2421 | } | |
2422 | ||
2423 | out_unlock: | |
2424 | mutex_unlock(&inode->i_mutex); | |
2425 | return 0; | |
2426 | } | |
2427 | ||
edbd8d4e CM |
2428 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2429 | { | |
2430 | u64 new_size; | |
2431 | u64 old_size; | |
2432 | struct btrfs_ioctl_vol_args *vol_args; | |
2433 | struct btrfs_trans_handle *trans; | |
2434 | char *sizestr; | |
2435 | int ret = 0; | |
2436 | int namelen; | |
2437 | int mod = 0; | |
2438 | ||
2439 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2440 | ||
2441 | if (!vol_args) | |
2442 | return -ENOMEM; | |
2443 | ||
2444 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2445 | ret = -EFAULT; | |
2446 | goto out; | |
2447 | } | |
2448 | namelen = strlen(vol_args->name); | |
2449 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2450 | ret = -EINVAL; | |
2451 | goto out; | |
2452 | } | |
2453 | ||
2454 | sizestr = vol_args->name; | |
2455 | if (!strcmp(sizestr, "max")) | |
2456 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2457 | else { | |
2458 | if (sizestr[0] == '-') { | |
2459 | mod = -1; | |
2460 | sizestr++; | |
2461 | } else if (sizestr[0] == '+') { | |
2462 | mod = 1; | |
2463 | sizestr++; | |
2464 | } | |
2465 | new_size = btrfs_parse_size(sizestr); | |
2466 | if (new_size == 0) { | |
2467 | ret = -EINVAL; | |
2468 | goto out; | |
2469 | } | |
2470 | } | |
2471 | ||
2472 | mutex_lock(&root->fs_info->fs_mutex); | |
2473 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2474 | ||
2475 | if (mod < 0) { | |
2476 | if (new_size > old_size) { | |
2477 | ret = -EINVAL; | |
2478 | goto out_unlock; | |
2479 | } | |
2480 | new_size = old_size - new_size; | |
2481 | } else if (mod > 0) { | |
2482 | new_size = old_size + new_size; | |
2483 | } | |
2484 | ||
2485 | if (new_size < 256 * 1024 * 1024) { | |
2486 | ret = -EINVAL; | |
2487 | goto out_unlock; | |
2488 | } | |
2489 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2490 | ret = -EFBIG; | |
2491 | goto out_unlock; | |
2492 | } | |
f9ef6604 CM |
2493 | |
2494 | do_div(new_size, root->sectorsize); | |
2495 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2496 | |
2497 | printk("new size is %Lu\n", new_size); | |
2498 | if (new_size > old_size) { | |
2499 | trans = btrfs_start_transaction(root, 1); | |
2500 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2501 | btrfs_commit_transaction(trans, root); | |
2502 | } else { | |
2503 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2504 | } | |
2505 | ||
2506 | out_unlock: | |
2507 | mutex_unlock(&root->fs_info->fs_mutex); | |
2508 | out: | |
2509 | kfree(vol_args); | |
2510 | return ret; | |
2511 | } | |
2512 | ||
4313b399 CM |
2513 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2514 | void __user *arg) | |
39279cc3 | 2515 | { |
4aec2b52 | 2516 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2517 | struct btrfs_dir_item *di; |
39279cc3 CM |
2518 | struct btrfs_path *path; |
2519 | u64 root_dirid; | |
4aec2b52 CM |
2520 | int namelen; |
2521 | int ret; | |
39279cc3 | 2522 | |
4aec2b52 | 2523 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2524 | |
4aec2b52 CM |
2525 | if (!vol_args) |
2526 | return -ENOMEM; | |
2527 | ||
2528 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2529 | ret = -EFAULT; | |
2530 | goto out; | |
2531 | } | |
2532 | ||
2533 | namelen = strlen(vol_args->name); | |
2534 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2535 | ret = -EINVAL; | |
2536 | goto out; | |
2537 | } | |
2538 | if (strchr(vol_args->name, '/')) { | |
2539 | ret = -EINVAL; | |
2540 | goto out; | |
2541 | } | |
d03581f4 CH |
2542 | |
2543 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2544 | if (!path) { |
2545 | ret = -ENOMEM; | |
2546 | goto out; | |
2547 | } | |
d03581f4 CH |
2548 | |
2549 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2550 | mutex_lock(&root->fs_info->fs_mutex); | |
2551 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2552 | path, root_dirid, | |
4aec2b52 | 2553 | vol_args->name, namelen, 0); |
d03581f4 CH |
2554 | mutex_unlock(&root->fs_info->fs_mutex); |
2555 | btrfs_free_path(path); | |
4aec2b52 CM |
2556 | |
2557 | if (di && !IS_ERR(di)) { | |
2558 | ret = -EEXIST; | |
2559 | goto out; | |
2560 | } | |
2561 | ||
2562 | if (IS_ERR(di)) { | |
2563 | ret = PTR_ERR(di); | |
2564 | goto out; | |
2565 | } | |
d03581f4 CH |
2566 | |
2567 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2568 | ret = create_subvol(root, vol_args->name, namelen); |
2569 | else | |
2570 | ret = create_snapshot(root, vol_args->name, namelen); | |
2571 | out: | |
2572 | kfree(vol_args); | |
2573 | return ret; | |
d03581f4 CH |
2574 | } |
2575 | ||
2576 | static int btrfs_ioctl_defrag(struct file *file) | |
2577 | { | |
6da6abae | 2578 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2579 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2580 | ||
2581 | switch (inode->i_mode & S_IFMT) { | |
2582 | case S_IFDIR: | |
39279cc3 | 2583 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2584 | btrfs_defrag_root(root, 0); |
2585 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2586 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2587 | break; |
d03581f4 CH |
2588 | case S_IFREG: |
2589 | btrfs_defrag_file(file); | |
2590 | break; | |
2591 | } | |
2592 | ||
2593 | return 0; | |
2594 | } | |
6702ed49 | 2595 | |
d03581f4 CH |
2596 | long btrfs_ioctl(struct file *file, unsigned int |
2597 | cmd, unsigned long arg) | |
2598 | { | |
6da6abae | 2599 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2600 | |
2601 | switch (cmd) { | |
2602 | case BTRFS_IOC_SNAP_CREATE: | |
2603 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2604 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2605 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2606 | case BTRFS_IOC_RESIZE: |
2607 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2608 | } |
d03581f4 CH |
2609 | |
2610 | return -ENOTTY; | |
39279cc3 CM |
2611 | } |
2612 | ||
39279cc3 CM |
2613 | /* |
2614 | * Called inside transaction, so use GFP_NOFS | |
2615 | */ | |
2616 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2617 | { | |
2618 | struct btrfs_inode *ei; | |
2619 | ||
2620 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2621 | if (!ei) | |
2622 | return NULL; | |
15ee9bc7 | 2623 | ei->last_trans = 0; |
dc17ff8f | 2624 | ei->ordered_trans = 0; |
39279cc3 CM |
2625 | return &ei->vfs_inode; |
2626 | } | |
2627 | ||
2628 | void btrfs_destroy_inode(struct inode *inode) | |
2629 | { | |
2630 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2631 | WARN_ON(inode->i_data.nrpages); | |
2632 | ||
2633 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2634 | } | |
2635 | ||
44ec0b71 CM |
2636 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2637 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2638 | #else | |
39279cc3 CM |
2639 | static void init_once(void * foo, struct kmem_cache * cachep, |
2640 | unsigned long flags) | |
44ec0b71 | 2641 | #endif |
39279cc3 CM |
2642 | { |
2643 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2644 | ||
2645 | inode_init_once(&ei->vfs_inode); | |
2646 | } | |
2647 | ||
2648 | void btrfs_destroy_cachep(void) | |
2649 | { | |
2650 | if (btrfs_inode_cachep) | |
2651 | kmem_cache_destroy(btrfs_inode_cachep); | |
2652 | if (btrfs_trans_handle_cachep) | |
2653 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2654 | if (btrfs_transaction_cachep) | |
2655 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2656 | if (btrfs_bit_radix_cachep) | |
2657 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2658 | if (btrfs_path_cachep) | |
2659 | kmem_cache_destroy(btrfs_path_cachep); | |
2660 | } | |
2661 | ||
86479a04 | 2662 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2663 | unsigned long extra_flags, |
44ec0b71 CM |
2664 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2665 | void (*ctor)(struct kmem_cache *, void *) | |
2666 | #else | |
92fee66d | 2667 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2668 | unsigned long) |
2669 | #endif | |
2670 | ) | |
92fee66d CM |
2671 | { |
2672 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2673 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2674 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2675 | ,NULL | |
2676 | #endif | |
2677 | ); | |
2678 | } | |
2679 | ||
39279cc3 CM |
2680 | int btrfs_init_cachep(void) |
2681 | { | |
86479a04 | 2682 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2683 | sizeof(struct btrfs_inode), |
2684 | 0, init_once); | |
39279cc3 CM |
2685 | if (!btrfs_inode_cachep) |
2686 | goto fail; | |
86479a04 CM |
2687 | btrfs_trans_handle_cachep = |
2688 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2689 | sizeof(struct btrfs_trans_handle), | |
2690 | 0, NULL); | |
39279cc3 CM |
2691 | if (!btrfs_trans_handle_cachep) |
2692 | goto fail; | |
86479a04 | 2693 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2694 | sizeof(struct btrfs_transaction), |
92fee66d | 2695 | 0, NULL); |
39279cc3 CM |
2696 | if (!btrfs_transaction_cachep) |
2697 | goto fail; | |
86479a04 | 2698 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2699 | sizeof(struct btrfs_path), |
92fee66d | 2700 | 0, NULL); |
39279cc3 CM |
2701 | if (!btrfs_path_cachep) |
2702 | goto fail; | |
86479a04 | 2703 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2704 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2705 | if (!btrfs_bit_radix_cachep) |
2706 | goto fail; | |
2707 | return 0; | |
2708 | fail: | |
2709 | btrfs_destroy_cachep(); | |
2710 | return -ENOMEM; | |
2711 | } | |
2712 | ||
2713 | static int btrfs_getattr(struct vfsmount *mnt, | |
2714 | struct dentry *dentry, struct kstat *stat) | |
2715 | { | |
2716 | struct inode *inode = dentry->d_inode; | |
2717 | generic_fillattr(inode, stat); | |
d6667462 | 2718 | stat->blksize = PAGE_CACHE_SIZE; |
39279cc3 CM |
2719 | return 0; |
2720 | } | |
2721 | ||
2722 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2723 | struct inode * new_dir,struct dentry *new_dentry) | |
2724 | { | |
2725 | struct btrfs_trans_handle *trans; | |
2726 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2727 | struct inode *new_inode = new_dentry->d_inode; | |
2728 | struct inode *old_inode = old_dentry->d_inode; | |
2729 | struct timespec ctime = CURRENT_TIME; | |
2730 | struct btrfs_path *path; | |
39279cc3 CM |
2731 | int ret; |
2732 | ||
2733 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2734 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2735 | return -ENOTEMPTY; | |
2736 | } | |
5f39d397 | 2737 | |
39279cc3 | 2738 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2739 | ret = btrfs_check_free_space(root, 1, 0); |
2740 | if (ret) | |
2741 | goto out_unlock; | |
2742 | ||
39279cc3 | 2743 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2744 | |
39279cc3 CM |
2745 | btrfs_set_trans_block_group(trans, new_dir); |
2746 | path = btrfs_alloc_path(); | |
2747 | if (!path) { | |
2748 | ret = -ENOMEM; | |
2749 | goto out_fail; | |
2750 | } | |
2751 | ||
2752 | old_dentry->d_inode->i_nlink++; | |
2753 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2754 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2755 | old_inode->i_ctime = ctime; | |
5f39d397 | 2756 | |
39279cc3 CM |
2757 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2758 | if (ret) | |
2759 | goto out_fail; | |
2760 | ||
2761 | if (new_inode) { | |
2762 | new_inode->i_ctime = CURRENT_TIME; | |
2763 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2764 | if (ret) | |
2765 | goto out_fail; | |
39279cc3 CM |
2766 | } |
2767 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2768 | if (ret) | |
2769 | goto out_fail; | |
2770 | ||
2771 | out_fail: | |
2772 | btrfs_free_path(path); | |
2773 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2774 | out_unlock: |
39279cc3 CM |
2775 | mutex_unlock(&root->fs_info->fs_mutex); |
2776 | return ret; | |
2777 | } | |
2778 | ||
2779 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2780 | const char *symname) | |
2781 | { | |
2782 | struct btrfs_trans_handle *trans; | |
2783 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2784 | struct btrfs_path *path; | |
2785 | struct btrfs_key key; | |
1832a6d5 | 2786 | struct inode *inode = NULL; |
39279cc3 CM |
2787 | int err; |
2788 | int drop_inode = 0; | |
2789 | u64 objectid; | |
2790 | int name_len; | |
2791 | int datasize; | |
5f39d397 | 2792 | unsigned long ptr; |
39279cc3 | 2793 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2794 | struct extent_buffer *leaf; |
1832a6d5 | 2795 | unsigned long nr = 0; |
39279cc3 CM |
2796 | |
2797 | name_len = strlen(symname) + 1; | |
2798 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2799 | return -ENAMETOOLONG; | |
1832a6d5 | 2800 | |
39279cc3 | 2801 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2802 | err = btrfs_check_free_space(root, 1, 0); |
2803 | if (err) | |
2804 | goto out_fail; | |
2805 | ||
39279cc3 CM |
2806 | trans = btrfs_start_transaction(root, 1); |
2807 | btrfs_set_trans_block_group(trans, dir); | |
2808 | ||
2809 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2810 | if (err) { | |
2811 | err = -ENOSPC; | |
2812 | goto out_unlock; | |
2813 | } | |
2814 | ||
2815 | inode = btrfs_new_inode(trans, root, objectid, | |
2816 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2817 | err = PTR_ERR(inode); | |
2818 | if (IS_ERR(inode)) | |
2819 | goto out_unlock; | |
2820 | ||
2821 | btrfs_set_trans_block_group(trans, inode); | |
2822 | err = btrfs_add_nondir(trans, dentry, inode); | |
2823 | if (err) | |
2824 | drop_inode = 1; | |
2825 | else { | |
2826 | inode->i_mapping->a_ops = &btrfs_aops; | |
2827 | inode->i_fop = &btrfs_file_operations; | |
2828 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2829 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2830 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2831 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2832 | } |
2833 | dir->i_sb->s_dirt = 1; | |
2834 | btrfs_update_inode_block_group(trans, inode); | |
2835 | btrfs_update_inode_block_group(trans, dir); | |
2836 | if (drop_inode) | |
2837 | goto out_unlock; | |
2838 | ||
2839 | path = btrfs_alloc_path(); | |
2840 | BUG_ON(!path); | |
2841 | key.objectid = inode->i_ino; | |
2842 | key.offset = 0; | |
39279cc3 CM |
2843 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2844 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2845 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2846 | datasize); | |
54aa1f4d CM |
2847 | if (err) { |
2848 | drop_inode = 1; | |
2849 | goto out_unlock; | |
2850 | } | |
5f39d397 CM |
2851 | leaf = path->nodes[0]; |
2852 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2853 | struct btrfs_file_extent_item); | |
2854 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2855 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2856 | BTRFS_FILE_EXTENT_INLINE); |
2857 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2858 | write_extent_buffer(leaf, symname, ptr, name_len); |
2859 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2860 | btrfs_free_path(path); |
5f39d397 | 2861 | |
39279cc3 CM |
2862 | inode->i_op = &btrfs_symlink_inode_operations; |
2863 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2864 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2865 | err = btrfs_update_inode(trans, root, inode); |
2866 | if (err) | |
2867 | drop_inode = 1; | |
39279cc3 CM |
2868 | |
2869 | out_unlock: | |
d3c2fdcf | 2870 | nr = trans->blocks_used; |
39279cc3 | 2871 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2872 | out_fail: |
39279cc3 | 2873 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2874 | if (drop_inode) { |
2875 | inode_dec_link_count(inode); | |
2876 | iput(inode); | |
2877 | } | |
d3c2fdcf | 2878 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2879 | return err; |
2880 | } | |
2881 | ||
2882 | static struct inode_operations btrfs_dir_inode_operations = { | |
2883 | .lookup = btrfs_lookup, | |
2884 | .create = btrfs_create, | |
2885 | .unlink = btrfs_unlink, | |
2886 | .link = btrfs_link, | |
2887 | .mkdir = btrfs_mkdir, | |
2888 | .rmdir = btrfs_rmdir, | |
2889 | .rename = btrfs_rename, | |
2890 | .symlink = btrfs_symlink, | |
2891 | .setattr = btrfs_setattr, | |
618e21d5 | 2892 | .mknod = btrfs_mknod, |
5103e947 JB |
2893 | .setxattr = generic_setxattr, |
2894 | .getxattr = generic_getxattr, | |
2895 | .listxattr = btrfs_listxattr, | |
2896 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2897 | }; |
2898 | ||
2899 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2900 | .lookup = btrfs_lookup, | |
2901 | }; | |
2902 | ||
2903 | static struct file_operations btrfs_dir_file_operations = { | |
2904 | .llseek = generic_file_llseek, | |
2905 | .read = generic_read_dir, | |
2906 | .readdir = btrfs_readdir, | |
34287aa3 | 2907 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2908 | #ifdef CONFIG_COMPAT |
34287aa3 | 2909 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2910 | #endif |
2911 | }; | |
2912 | ||
07157aac CM |
2913 | static struct extent_map_ops btrfs_extent_map_ops = { |
2914 | .fill_delalloc = run_delalloc_range, | |
2915 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2916 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2917 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2918 | }; | |
2919 | ||
39279cc3 CM |
2920 | static struct address_space_operations btrfs_aops = { |
2921 | .readpage = btrfs_readpage, | |
2922 | .writepage = btrfs_writepage, | |
b293f02e | 2923 | .writepages = btrfs_writepages, |
3ab2fb5a | 2924 | .readpages = btrfs_readpages, |
39279cc3 | 2925 | .sync_page = block_sync_page, |
39279cc3 | 2926 | .bmap = btrfs_bmap, |
a52d9a80 CM |
2927 | .invalidatepage = btrfs_invalidatepage, |
2928 | .releasepage = btrfs_releasepage, | |
2929 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2930 | }; |
2931 | ||
2932 | static struct address_space_operations btrfs_symlink_aops = { | |
2933 | .readpage = btrfs_readpage, | |
2934 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2935 | .invalidatepage = btrfs_invalidatepage, |
2936 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2937 | }; |
2938 | ||
2939 | static struct inode_operations btrfs_file_inode_operations = { | |
2940 | .truncate = btrfs_truncate, | |
2941 | .getattr = btrfs_getattr, | |
2942 | .setattr = btrfs_setattr, | |
5103e947 JB |
2943 | .setxattr = generic_setxattr, |
2944 | .getxattr = generic_getxattr, | |
2945 | .listxattr = btrfs_listxattr, | |
2946 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2947 | }; |
2948 | ||
618e21d5 JB |
2949 | static struct inode_operations btrfs_special_inode_operations = { |
2950 | .getattr = btrfs_getattr, | |
2951 | .setattr = btrfs_setattr, | |
2952 | }; | |
2953 | ||
39279cc3 CM |
2954 | static struct inode_operations btrfs_symlink_inode_operations = { |
2955 | .readlink = generic_readlink, | |
2956 | .follow_link = page_follow_link_light, | |
2957 | .put_link = page_put_link, | |
2958 | }; |