]>
Commit | Line | Data |
---|---|---|
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 | ||
be20aa9d | 75 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
76 | { |
77 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
78 | struct btrfs_trans_handle *trans; | |
b888db2b | 79 | u64 alloc_hint = 0; |
db94535d | 80 | u64 num_bytes; |
c59f8951 | 81 | u64 cur_alloc_size; |
db94535d | 82 | u64 blocksize = root->sectorsize; |
be20aa9d CM |
83 | struct btrfs_key ins; |
84 | int ret; | |
b888db2b | 85 | |
b888db2b | 86 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 87 | BUG_ON(!trans); |
be20aa9d CM |
88 | btrfs_set_trans_block_group(trans, inode); |
89 | ||
db94535d | 90 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 91 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 92 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 93 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 94 | |
179e29e4 CM |
95 | if (alloc_hint == EXTENT_MAP_INLINE) |
96 | goto out; | |
97 | ||
c59f8951 CM |
98 | while(num_bytes > 0) { |
99 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
100 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
101 | root->root_key.objectid, | |
102 | trans->transid, | |
103 | inode->i_ino, start, 0, | |
104 | alloc_hint, (u64)-1, &ins, 1); | |
105 | if (ret) { | |
106 | WARN_ON(1); | |
107 | goto out; | |
108 | } | |
109 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
110 | start, ins.objectid, ins.offset, | |
111 | ins.offset); | |
112 | num_bytes -= cur_alloc_size; | |
113 | alloc_hint = ins.objectid + ins.offset; | |
114 | start += cur_alloc_size; | |
b888db2b | 115 | } |
b888db2b CM |
116 | out: |
117 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
118 | return ret; |
119 | } | |
120 | ||
121 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
122 | { | |
123 | u64 extent_start; | |
124 | u64 extent_end; | |
125 | u64 bytenr; | |
126 | u64 cow_end; | |
127 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
128 | struct extent_buffer *leaf; | |
129 | int found_type; | |
130 | struct btrfs_path *path; | |
131 | struct btrfs_file_extent_item *item; | |
132 | int ret; | |
133 | int err; | |
134 | struct btrfs_key found_key; | |
135 | ||
136 | path = btrfs_alloc_path(); | |
137 | BUG_ON(!path); | |
138 | again: | |
139 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
140 | inode->i_ino, start, 0); | |
141 | if (ret < 0) { | |
142 | btrfs_free_path(path); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | cow_end = end; | |
147 | if (ret != 0) { | |
148 | if (path->slots[0] == 0) | |
149 | goto not_found; | |
150 | path->slots[0]--; | |
151 | } | |
152 | ||
153 | leaf = path->nodes[0]; | |
154 | item = btrfs_item_ptr(leaf, path->slots[0], | |
155 | struct btrfs_file_extent_item); | |
156 | ||
157 | /* are we inside the extent that was found? */ | |
158 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
159 | found_type = btrfs_key_type(&found_key); | |
160 | if (found_key.objectid != inode->i_ino || | |
161 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
162 | goto not_found; | |
163 | } | |
164 | ||
165 | found_type = btrfs_file_extent_type(leaf, item); | |
166 | extent_start = found_key.offset; | |
167 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
168 | extent_end = extent_start + | |
169 | btrfs_file_extent_num_bytes(leaf, item); | |
170 | err = 0; | |
171 | ||
172 | if (start < extent_start || start >= extent_end) | |
173 | goto not_found; | |
174 | ||
175 | cow_end = min(end, extent_end - 1); | |
176 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
177 | if (bytenr == 0) | |
178 | goto not_found; | |
179 | ||
180 | bytenr += btrfs_file_extent_offset(leaf, item); | |
181 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { | |
182 | goto not_found; | |
183 | } | |
184 | ||
185 | start = extent_end; | |
186 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
187 | goto not_found; | |
188 | } | |
189 | loop: | |
190 | if (start > end) { | |
191 | btrfs_free_path(path); | |
192 | return 0; | |
193 | } | |
194 | btrfs_release_path(root, path); | |
195 | goto again; | |
196 | ||
197 | not_found: | |
198 | cow_file_range(inode, start, cow_end); | |
199 | start = cow_end + 1; | |
200 | goto loop; | |
201 | } | |
202 | ||
203 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
204 | { | |
205 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
206 | int ret; | |
207 | ||
208 | mutex_lock(&root->fs_info->fs_mutex); | |
209 | if (btrfs_test_opt(root, NODATACOW)) | |
210 | ret = run_delalloc_nocow(inode, start, end); | |
211 | else | |
212 | ret = cow_file_range(inode, start, end); | |
b888db2b CM |
213 | mutex_unlock(&root->fs_info->fs_mutex); |
214 | return ret; | |
215 | } | |
216 | ||
07157aac CM |
217 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
218 | { | |
219 | struct inode *inode = page->mapping->host; | |
220 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
221 | struct btrfs_trans_handle *trans; | |
222 | char *kaddr; | |
b6cda9bc | 223 | int ret = 0; |
35ebb934 | 224 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
225 | size_t offset = start - page_start; |
226 | ||
b6cda9bc CM |
227 | if (btrfs_test_opt(root, NODATASUM)) |
228 | return 0; | |
229 | ||
07157aac CM |
230 | mutex_lock(&root->fs_info->fs_mutex); |
231 | trans = btrfs_start_transaction(root, 1); | |
232 | btrfs_set_trans_block_group(trans, inode); | |
233 | kaddr = kmap(page); | |
f578d4bd | 234 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
235 | start, kaddr + offset, end - start + 1); |
236 | kunmap(page); | |
237 | ret = btrfs_end_transaction(trans, root); | |
238 | BUG_ON(ret); | |
239 | mutex_unlock(&root->fs_info->fs_mutex); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
244 | { | |
245 | int ret = 0; | |
246 | struct inode *inode = page->mapping->host; | |
247 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
248 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
249 | struct btrfs_csum_item *item; | |
250 | struct btrfs_path *path = NULL; | |
ff79f819 | 251 | u32 csum; |
07157aac | 252 | |
b6cda9bc CM |
253 | if (btrfs_test_opt(root, NODATASUM)) |
254 | return 0; | |
255 | ||
07157aac CM |
256 | mutex_lock(&root->fs_info->fs_mutex); |
257 | path = btrfs_alloc_path(); | |
258 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
259 | if (IS_ERR(item)) { | |
260 | ret = PTR_ERR(item); | |
261 | /* a csum that isn't present is a preallocated region. */ | |
262 | if (ret == -ENOENT || ret == -EFBIG) | |
263 | ret = 0; | |
ff79f819 | 264 | csum = 0; |
07157aac CM |
265 | goto out; |
266 | } | |
ff79f819 CM |
267 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
268 | BTRFS_CRC32_SIZE); | |
269 | set_state_private(em_tree, start, csum); | |
07157aac CM |
270 | out: |
271 | if (path) | |
272 | btrfs_free_path(path); | |
273 | mutex_unlock(&root->fs_info->fs_mutex); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
278 | { | |
35ebb934 | 279 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 280 | struct inode *inode = page->mapping->host; |
07157aac CM |
281 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
282 | char *kaddr; | |
283 | u64 private; | |
284 | int ret; | |
ff79f819 CM |
285 | struct btrfs_root *root = BTRFS_I(inode)->root; |
286 | u32 csum = ~(u32)0; | |
bbf0d006 | 287 | unsigned long flags; |
07157aac | 288 | |
b6cda9bc CM |
289 | if (btrfs_test_opt(root, NODATASUM)) |
290 | return 0; | |
291 | ||
07157aac | 292 | ret = get_state_private(em_tree, start, &private); |
bbf0d006 | 293 | local_irq_save(flags); |
07157aac CM |
294 | kaddr = kmap_atomic(page, KM_IRQ0); |
295 | if (ret) { | |
296 | goto zeroit; | |
297 | } | |
ff79f819 CM |
298 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
299 | btrfs_csum_final(csum, (char *)&csum); | |
300 | if (csum != private) { | |
07157aac CM |
301 | goto zeroit; |
302 | } | |
303 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 304 | local_irq_restore(flags); |
07157aac CM |
305 | return 0; |
306 | ||
307 | zeroit: | |
308 | printk("btrfs csum failed ino %lu off %llu\n", | |
309 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
310 | memset(kaddr + offset, 1, end - start + 1); |
311 | flush_dcache_page(page); | |
07157aac | 312 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 313 | local_irq_restore(flags); |
07157aac CM |
314 | return 0; |
315 | } | |
b888db2b | 316 | |
39279cc3 CM |
317 | void btrfs_read_locked_inode(struct inode *inode) |
318 | { | |
319 | struct btrfs_path *path; | |
5f39d397 | 320 | struct extent_buffer *leaf; |
39279cc3 | 321 | struct btrfs_inode_item *inode_item; |
5f39d397 | 322 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
323 | struct btrfs_root *root = BTRFS_I(inode)->root; |
324 | struct btrfs_key location; | |
325 | u64 alloc_group_block; | |
618e21d5 | 326 | u32 rdev; |
39279cc3 CM |
327 | int ret; |
328 | ||
329 | path = btrfs_alloc_path(); | |
330 | BUG_ON(!path); | |
39279cc3 CM |
331 | mutex_lock(&root->fs_info->fs_mutex); |
332 | ||
333 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
334 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 335 | if (ret) |
39279cc3 | 336 | goto make_bad; |
39279cc3 | 337 | |
5f39d397 CM |
338 | leaf = path->nodes[0]; |
339 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
340 | struct btrfs_inode_item); | |
341 | ||
342 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
343 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
344 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
345 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
346 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
347 | ||
348 | tspec = btrfs_inode_atime(inode_item); | |
349 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
350 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
351 | ||
352 | tspec = btrfs_inode_mtime(inode_item); | |
353 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
354 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
355 | ||
356 | tspec = btrfs_inode_ctime(inode_item); | |
357 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
358 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
359 | ||
360 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
361 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 362 | inode->i_rdev = 0; |
5f39d397 CM |
363 | rdev = btrfs_inode_rdev(leaf, inode_item); |
364 | ||
365 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
366 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
367 | alloc_group_block); | |
368 | ||
369 | btrfs_free_path(path); | |
370 | inode_item = NULL; | |
371 | ||
372 | mutex_unlock(&root->fs_info->fs_mutex); | |
373 | ||
374 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
375 | case S_IFREG: |
376 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 377 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
378 | inode->i_fop = &btrfs_file_operations; |
379 | inode->i_op = &btrfs_file_inode_operations; | |
380 | break; | |
381 | case S_IFDIR: | |
382 | inode->i_fop = &btrfs_dir_file_operations; | |
383 | if (root == root->fs_info->tree_root) | |
384 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
385 | else | |
386 | inode->i_op = &btrfs_dir_inode_operations; | |
387 | break; | |
388 | case S_IFLNK: | |
389 | inode->i_op = &btrfs_symlink_inode_operations; | |
390 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
391 | break; | |
618e21d5 JB |
392 | default: |
393 | init_special_inode(inode, inode->i_mode, rdev); | |
394 | break; | |
39279cc3 CM |
395 | } |
396 | return; | |
397 | ||
398 | make_bad: | |
399 | btrfs_release_path(root, path); | |
400 | btrfs_free_path(path); | |
401 | mutex_unlock(&root->fs_info->fs_mutex); | |
402 | make_bad_inode(inode); | |
403 | } | |
404 | ||
5f39d397 CM |
405 | static void fill_inode_item(struct extent_buffer *leaf, |
406 | struct btrfs_inode_item *item, | |
39279cc3 CM |
407 | struct inode *inode) |
408 | { | |
5f39d397 CM |
409 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
410 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
411 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
412 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
413 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
414 | ||
415 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
416 | inode->i_atime.tv_sec); | |
417 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
418 | inode->i_atime.tv_nsec); | |
419 | ||
420 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
421 | inode->i_mtime.tv_sec); | |
422 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
423 | inode->i_mtime.tv_nsec); | |
424 | ||
425 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
426 | inode->i_ctime.tv_sec); | |
427 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
428 | inode->i_ctime.tv_nsec); | |
429 | ||
430 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
431 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
432 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
433 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
434 | BTRFS_I(inode)->block_group->key.objectid); |
435 | } | |
436 | ||
a52d9a80 | 437 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
438 | struct btrfs_root *root, |
439 | struct inode *inode) | |
440 | { | |
441 | struct btrfs_inode_item *inode_item; | |
442 | struct btrfs_path *path; | |
5f39d397 | 443 | struct extent_buffer *leaf; |
39279cc3 CM |
444 | int ret; |
445 | ||
446 | path = btrfs_alloc_path(); | |
447 | BUG_ON(!path); | |
39279cc3 CM |
448 | ret = btrfs_lookup_inode(trans, root, path, |
449 | &BTRFS_I(inode)->location, 1); | |
450 | if (ret) { | |
451 | if (ret > 0) | |
452 | ret = -ENOENT; | |
453 | goto failed; | |
454 | } | |
455 | ||
5f39d397 CM |
456 | leaf = path->nodes[0]; |
457 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
458 | struct btrfs_inode_item); |
459 | ||
5f39d397 CM |
460 | fill_inode_item(leaf, inode_item, inode); |
461 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 462 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
463 | ret = 0; |
464 | failed: | |
465 | btrfs_release_path(root, path); | |
466 | btrfs_free_path(path); | |
467 | return ret; | |
468 | } | |
469 | ||
470 | ||
471 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
472 | struct btrfs_root *root, | |
473 | struct inode *dir, | |
474 | struct dentry *dentry) | |
475 | { | |
476 | struct btrfs_path *path; | |
477 | const char *name = dentry->d_name.name; | |
478 | int name_len = dentry->d_name.len; | |
479 | int ret = 0; | |
5f39d397 | 480 | struct extent_buffer *leaf; |
39279cc3 | 481 | struct btrfs_dir_item *di; |
5f39d397 | 482 | struct btrfs_key key; |
39279cc3 CM |
483 | |
484 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
485 | if (!path) { |
486 | ret = -ENOMEM; | |
487 | goto err; | |
488 | } | |
489 | ||
39279cc3 CM |
490 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
491 | name, name_len, -1); | |
492 | if (IS_ERR(di)) { | |
493 | ret = PTR_ERR(di); | |
494 | goto err; | |
495 | } | |
496 | if (!di) { | |
497 | ret = -ENOENT; | |
498 | goto err; | |
499 | } | |
5f39d397 CM |
500 | leaf = path->nodes[0]; |
501 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 502 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
503 | if (ret) |
504 | goto err; | |
39279cc3 CM |
505 | btrfs_release_path(root, path); |
506 | ||
507 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 508 | key.objectid, name, name_len, -1); |
39279cc3 CM |
509 | if (IS_ERR(di)) { |
510 | ret = PTR_ERR(di); | |
511 | goto err; | |
512 | } | |
513 | if (!di) { | |
514 | ret = -ENOENT; | |
515 | goto err; | |
516 | } | |
517 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
518 | |
519 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
520 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
521 | dentry->d_inode->i_ino, | |
522 | dentry->d_parent->d_inode->i_ino); | |
523 | if (ret) { | |
524 | printk("failed to delete reference to %.*s, " | |
525 | "inode %lu parent %lu\n", name_len, name, | |
526 | dentry->d_inode->i_ino, | |
527 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 528 | } |
39279cc3 CM |
529 | err: |
530 | btrfs_free_path(path); | |
531 | if (!ret) { | |
532 | dir->i_size -= name_len * 2; | |
79c44584 | 533 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 534 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
535 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
536 | dentry->d_inode->i_nlink--; | |
537 | #else | |
39279cc3 | 538 | drop_nlink(dentry->d_inode); |
6da6abae | 539 | #endif |
54aa1f4d | 540 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
541 | dir->i_sb->s_dirt = 1; |
542 | } | |
543 | return ret; | |
544 | } | |
545 | ||
546 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
547 | { | |
548 | struct btrfs_root *root; | |
549 | struct btrfs_trans_handle *trans; | |
550 | int ret; | |
d3c2fdcf | 551 | unsigned long nr; |
39279cc3 CM |
552 | |
553 | root = BTRFS_I(dir)->root; | |
554 | mutex_lock(&root->fs_info->fs_mutex); | |
555 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 556 | |
39279cc3 CM |
557 | btrfs_set_trans_block_group(trans, dir); |
558 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 559 | nr = trans->blocks_used; |
5f39d397 | 560 | |
39279cc3 CM |
561 | btrfs_end_transaction(trans, root); |
562 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 563 | btrfs_btree_balance_dirty(root, nr); |
5f39d397 | 564 | |
39279cc3 CM |
565 | return ret; |
566 | } | |
567 | ||
568 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
569 | { | |
570 | struct inode *inode = dentry->d_inode; | |
571 | int err; | |
572 | int ret; | |
573 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 574 | struct btrfs_trans_handle *trans; |
d3c2fdcf | 575 | unsigned long nr; |
39279cc3 | 576 | |
134d4512 Y |
577 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
578 | return -ENOTEMPTY; | |
579 | ||
39279cc3 CM |
580 | mutex_lock(&root->fs_info->fs_mutex); |
581 | trans = btrfs_start_transaction(root, 1); | |
582 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
583 | |
584 | /* now the directory is empty */ | |
585 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
586 | if (!err) { | |
587 | inode->i_size = 0; | |
588 | } | |
3954401f | 589 | |
d3c2fdcf | 590 | nr = trans->blocks_used; |
39279cc3 | 591 | ret = btrfs_end_transaction(trans, root); |
134d4512 | 592 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 593 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 594 | |
39279cc3 CM |
595 | if (ret && !err) |
596 | err = ret; | |
597 | return err; | |
598 | } | |
599 | ||
600 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
601 | struct btrfs_root *root, | |
602 | struct inode *inode) | |
603 | { | |
604 | struct btrfs_path *path; | |
605 | int ret; | |
606 | ||
607 | clear_inode(inode); | |
608 | ||
609 | path = btrfs_alloc_path(); | |
610 | BUG_ON(!path); | |
39279cc3 CM |
611 | ret = btrfs_lookup_inode(trans, root, path, |
612 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
613 | if (ret > 0) |
614 | ret = -ENOENT; | |
615 | if (!ret) | |
616 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
617 | btrfs_free_path(path); |
618 | return ret; | |
619 | } | |
620 | ||
39279cc3 CM |
621 | /* |
622 | * this can truncate away extent items, csum items and directory items. | |
623 | * It starts at a high offset and removes keys until it can't find | |
624 | * any higher than i_size. | |
625 | * | |
626 | * csum items that cross the new i_size are truncated to the new size | |
627 | * as well. | |
628 | */ | |
629 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
630 | struct btrfs_root *root, | |
631 | struct inode *inode) | |
632 | { | |
633 | int ret; | |
634 | struct btrfs_path *path; | |
635 | struct btrfs_key key; | |
5f39d397 | 636 | struct btrfs_key found_key; |
39279cc3 | 637 | u32 found_type; |
5f39d397 | 638 | struct extent_buffer *leaf; |
39279cc3 CM |
639 | struct btrfs_file_extent_item *fi; |
640 | u64 extent_start = 0; | |
db94535d | 641 | u64 extent_num_bytes = 0; |
39279cc3 | 642 | u64 item_end = 0; |
7bb86316 | 643 | u64 root_gen = 0; |
d8d5f3e1 | 644 | u64 root_owner = 0; |
39279cc3 CM |
645 | int found_extent; |
646 | int del_item; | |
179e29e4 | 647 | int extent_type = -1; |
39279cc3 | 648 | |
a52d9a80 | 649 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 650 | path = btrfs_alloc_path(); |
3c69faec | 651 | path->reada = -1; |
39279cc3 | 652 | BUG_ON(!path); |
5f39d397 | 653 | |
39279cc3 CM |
654 | /* FIXME, add redo link to tree so we don't leak on crash */ |
655 | key.objectid = inode->i_ino; | |
656 | key.offset = (u64)-1; | |
5f39d397 CM |
657 | key.type = (u8)-1; |
658 | ||
39279cc3 CM |
659 | while(1) { |
660 | btrfs_init_path(path); | |
661 | fi = NULL; | |
662 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
663 | if (ret < 0) { | |
664 | goto error; | |
665 | } | |
666 | if (ret > 0) { | |
667 | BUG_ON(path->slots[0] == 0); | |
668 | path->slots[0]--; | |
669 | } | |
5f39d397 CM |
670 | leaf = path->nodes[0]; |
671 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
672 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 673 | |
5f39d397 | 674 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 675 | break; |
5f39d397 | 676 | |
39279cc3 CM |
677 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
678 | found_type != BTRFS_DIR_ITEM_KEY && | |
679 | found_type != BTRFS_DIR_INDEX_KEY && | |
680 | found_type != BTRFS_EXTENT_DATA_KEY) | |
681 | break; | |
682 | ||
5f39d397 | 683 | item_end = found_key.offset; |
39279cc3 | 684 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 685 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 686 | struct btrfs_file_extent_item); |
179e29e4 CM |
687 | extent_type = btrfs_file_extent_type(leaf, fi); |
688 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 689 | item_end += |
db94535d | 690 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
691 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
692 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
693 | path->slots[0]); | |
694 | item_end += btrfs_file_extent_inline_len(leaf, | |
695 | item); | |
39279cc3 | 696 | } |
008630c1 | 697 | item_end--; |
39279cc3 CM |
698 | } |
699 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
700 | ret = btrfs_csum_truncate(trans, root, path, | |
701 | inode->i_size); | |
702 | BUG_ON(ret); | |
703 | } | |
008630c1 | 704 | if (item_end < inode->i_size) { |
b888db2b CM |
705 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
706 | found_type = BTRFS_INODE_ITEM_KEY; | |
707 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
708 | found_type = BTRFS_CSUM_ITEM_KEY; | |
709 | } else if (found_type) { | |
710 | found_type--; | |
711 | } else { | |
712 | break; | |
39279cc3 | 713 | } |
a61721d5 | 714 | btrfs_set_key_type(&key, found_type); |
65555a06 | 715 | btrfs_release_path(root, path); |
b888db2b | 716 | continue; |
39279cc3 | 717 | } |
5f39d397 | 718 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
719 | del_item = 1; |
720 | else | |
721 | del_item = 0; | |
722 | found_extent = 0; | |
723 | ||
724 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
725 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
726 | goto delete; | |
727 | ||
728 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 729 | u64 num_dec; |
db94535d | 730 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 731 | if (!del_item) { |
db94535d CM |
732 | u64 orig_num_bytes = |
733 | btrfs_file_extent_num_bytes(leaf, fi); | |
734 | extent_num_bytes = inode->i_size - | |
5f39d397 | 735 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
736 | btrfs_set_file_extent_num_bytes(leaf, fi, |
737 | extent_num_bytes); | |
738 | num_dec = (orig_num_bytes - | |
739 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
740 | if (extent_start != 0) { |
741 | inode->i_blocks -= num_dec; | |
742 | } | |
5f39d397 | 743 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 744 | } else { |
db94535d CM |
745 | extent_num_bytes = |
746 | btrfs_file_extent_disk_num_bytes(leaf, | |
747 | fi); | |
39279cc3 | 748 | /* FIXME blocksize != 4096 */ |
db94535d CM |
749 | num_dec = btrfs_file_extent_num_bytes(leaf, |
750 | fi) >> 9; | |
39279cc3 CM |
751 | if (extent_start != 0) { |
752 | found_extent = 1; | |
753 | inode->i_blocks -= num_dec; | |
754 | } | |
d8d5f3e1 CM |
755 | root_gen = btrfs_header_generation(leaf); |
756 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 757 | } |
179e29e4 CM |
758 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
759 | !del_item) { | |
760 | u32 newsize = inode->i_size - found_key.offset; | |
761 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
762 | ret = btrfs_truncate_item(trans, root, path, | |
763 | newsize, 1); | |
764 | BUG_ON(ret); | |
39279cc3 | 765 | } |
179e29e4 | 766 | delete: |
39279cc3 CM |
767 | if (del_item) { |
768 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
769 | if (ret) |
770 | goto error; | |
39279cc3 CM |
771 | } else { |
772 | break; | |
773 | } | |
774 | btrfs_release_path(root, path); | |
775 | if (found_extent) { | |
776 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 777 | extent_num_bytes, |
d8d5f3e1 | 778 | root_owner, |
7bb86316 CM |
779 | root_gen, inode->i_ino, |
780 | found_key.offset, 0); | |
39279cc3 CM |
781 | BUG_ON(ret); |
782 | } | |
783 | } | |
784 | ret = 0; | |
785 | error: | |
786 | btrfs_release_path(root, path); | |
787 | btrfs_free_path(path); | |
788 | inode->i_sb->s_dirt = 1; | |
789 | return ret; | |
790 | } | |
791 | ||
b888db2b | 792 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
793 | size_t zero_start) |
794 | { | |
795 | char *kaddr; | |
796 | int ret = 0; | |
b888db2b | 797 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
35ebb934 | 798 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 799 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 | 800 | |
b3cfa35a | 801 | set_page_extent_mapped(page); |
a52d9a80 | 802 | |
b888db2b CM |
803 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
804 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
805 | page_end, GFP_NOFS); | |
a52d9a80 | 806 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 807 | kaddr = kmap(page); |
a52d9a80 CM |
808 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
809 | flush_dcache_page(page); | |
b888db2b | 810 | kunmap(page); |
a52d9a80 | 811 | } |
b888db2b CM |
812 | set_page_dirty(page); |
813 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 814 | |
a52d9a80 CM |
815 | return ret; |
816 | } | |
817 | ||
39279cc3 CM |
818 | /* |
819 | * taken from block_truncate_page, but does cow as it zeros out | |
820 | * any bytes left in the last page in the file. | |
821 | */ | |
822 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
823 | { | |
824 | struct inode *inode = mapping->host; | |
db94535d CM |
825 | struct btrfs_root *root = BTRFS_I(inode)->root; |
826 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
827 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
828 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
829 | struct page *page; | |
39279cc3 | 830 | int ret = 0; |
a52d9a80 | 831 | u64 page_start; |
39279cc3 CM |
832 | |
833 | if ((offset & (blocksize - 1)) == 0) | |
834 | goto out; | |
835 | ||
db94535d | 836 | down_read(&root->snap_sem); |
39279cc3 CM |
837 | ret = -ENOMEM; |
838 | page = grab_cache_page(mapping, index); | |
839 | if (!page) | |
840 | goto out; | |
39279cc3 | 841 | if (!PageUptodate(page)) { |
9ebefb18 | 842 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
843 | lock_page(page); |
844 | if (!PageUptodate(page)) { | |
845 | ret = -EIO; | |
846 | goto out; | |
847 | } | |
848 | } | |
35ebb934 | 849 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 850 | |
b888db2b | 851 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 852 | |
39279cc3 CM |
853 | unlock_page(page); |
854 | page_cache_release(page); | |
011410bd | 855 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
856 | out: |
857 | return ret; | |
858 | } | |
859 | ||
860 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
861 | { | |
862 | struct inode *inode = dentry->d_inode; | |
863 | int err; | |
864 | ||
865 | err = inode_change_ok(inode, attr); | |
866 | if (err) | |
867 | return err; | |
868 | ||
869 | if (S_ISREG(inode->i_mode) && | |
870 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
871 | struct btrfs_trans_handle *trans; | |
872 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
873 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
874 | ||
5f39d397 | 875 | u64 mask = root->sectorsize - 1; |
39279cc3 | 876 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 877 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 878 | u64 hole_size; |
179e29e4 | 879 | u64 alloc_hint = 0; |
39279cc3 CM |
880 | |
881 | if (attr->ia_size <= pos) | |
882 | goto out; | |
883 | ||
884 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
885 | ||
2bf5a725 | 886 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 887 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
888 | |
889 | mutex_lock(&root->fs_info->fs_mutex); | |
890 | trans = btrfs_start_transaction(root, 1); | |
891 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 892 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
893 | pos, pos + hole_size, pos, |
894 | &alloc_hint); | |
2bf5a725 | 895 | |
179e29e4 CM |
896 | if (alloc_hint != EXTENT_MAP_INLINE) { |
897 | err = btrfs_insert_file_extent(trans, root, | |
898 | inode->i_ino, | |
899 | pos, 0, 0, hole_size); | |
900 | } | |
39279cc3 CM |
901 | btrfs_end_transaction(trans, root); |
902 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 903 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
904 | if (err) |
905 | return err; | |
39279cc3 CM |
906 | } |
907 | out: | |
908 | err = inode_setattr(inode, attr); | |
909 | ||
910 | return err; | |
911 | } | |
912 | void btrfs_delete_inode(struct inode *inode) | |
913 | { | |
914 | struct btrfs_trans_handle *trans; | |
915 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 916 | unsigned long nr; |
39279cc3 CM |
917 | int ret; |
918 | ||
919 | truncate_inode_pages(&inode->i_data, 0); | |
920 | if (is_bad_inode(inode)) { | |
921 | goto no_delete; | |
922 | } | |
5f39d397 | 923 | |
39279cc3 CM |
924 | inode->i_size = 0; |
925 | mutex_lock(&root->fs_info->fs_mutex); | |
926 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 927 | |
39279cc3 CM |
928 | btrfs_set_trans_block_group(trans, inode); |
929 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
930 | if (ret) |
931 | goto no_delete_lock; | |
932 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
933 | if (ret) |
934 | goto no_delete_lock; | |
935 | ret = btrfs_free_inode(trans, root, inode); | |
936 | if (ret) | |
937 | goto no_delete_lock; | |
d3c2fdcf | 938 | nr = trans->blocks_used; |
5f39d397 | 939 | |
39279cc3 CM |
940 | btrfs_end_transaction(trans, root); |
941 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 942 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 943 | return; |
54aa1f4d CM |
944 | |
945 | no_delete_lock: | |
d3c2fdcf | 946 | nr = trans->blocks_used; |
54aa1f4d CM |
947 | btrfs_end_transaction(trans, root); |
948 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 949 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
950 | no_delete: |
951 | clear_inode(inode); | |
952 | } | |
953 | ||
954 | /* | |
955 | * this returns the key found in the dir entry in the location pointer. | |
956 | * If no dir entries were found, location->objectid is 0. | |
957 | */ | |
958 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
959 | struct btrfs_key *location) | |
960 | { | |
961 | const char *name = dentry->d_name.name; | |
962 | int namelen = dentry->d_name.len; | |
963 | struct btrfs_dir_item *di; | |
964 | struct btrfs_path *path; | |
965 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 966 | int ret = 0; |
39279cc3 | 967 | |
3954401f CM |
968 | if (namelen == 1 && strcmp(name, ".") == 0) { |
969 | location->objectid = dir->i_ino; | |
970 | location->type = BTRFS_INODE_ITEM_KEY; | |
971 | location->offset = 0; | |
972 | return 0; | |
973 | } | |
39279cc3 CM |
974 | path = btrfs_alloc_path(); |
975 | BUG_ON(!path); | |
3954401f | 976 | |
7a720536 | 977 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
978 | struct btrfs_key key; |
979 | struct extent_buffer *leaf; | |
980 | u32 nritems; | |
981 | int slot; | |
982 | ||
983 | key.objectid = dir->i_ino; | |
984 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
985 | key.offset = 0; | |
986 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
987 | BUG_ON(ret == 0); | |
988 | ret = 0; | |
989 | ||
990 | leaf = path->nodes[0]; | |
991 | slot = path->slots[0]; | |
992 | nritems = btrfs_header_nritems(leaf); | |
993 | if (slot >= nritems) | |
994 | goto out_err; | |
995 | ||
996 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
997 | if (key.objectid != dir->i_ino || | |
998 | key.type != BTRFS_INODE_REF_KEY) { | |
999 | goto out_err; | |
1000 | } | |
1001 | location->objectid = key.offset; | |
1002 | location->type = BTRFS_INODE_ITEM_KEY; | |
1003 | location->offset = 0; | |
1004 | goto out; | |
1005 | } | |
1006 | ||
39279cc3 CM |
1007 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1008 | namelen, 0); | |
0d9f7f3e Y |
1009 | if (IS_ERR(di)) |
1010 | ret = PTR_ERR(di); | |
39279cc3 | 1011 | if (!di || IS_ERR(di)) { |
3954401f | 1012 | goto out_err; |
39279cc3 | 1013 | } |
5f39d397 | 1014 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1015 | out: |
39279cc3 CM |
1016 | btrfs_free_path(path); |
1017 | return ret; | |
3954401f CM |
1018 | out_err: |
1019 | location->objectid = 0; | |
1020 | goto out; | |
39279cc3 CM |
1021 | } |
1022 | ||
1023 | /* | |
1024 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1025 | * needs to be changed to reflect the root directory of the tree root. This | |
1026 | * is kind of like crossing a mount point. | |
1027 | */ | |
1028 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1029 | struct btrfs_key *location, | |
58176a96 JB |
1030 | struct btrfs_root **sub_root, |
1031 | struct dentry *dentry) | |
39279cc3 CM |
1032 | { |
1033 | struct btrfs_path *path; | |
1034 | struct btrfs_root_item *ri; | |
1035 | ||
1036 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1037 | return 0; | |
1038 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1039 | return 0; | |
1040 | ||
1041 | path = btrfs_alloc_path(); | |
1042 | BUG_ON(!path); | |
1043 | mutex_lock(&root->fs_info->fs_mutex); | |
1044 | ||
58176a96 JB |
1045 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1046 | dentry->d_name.name, | |
1047 | dentry->d_name.len); | |
39279cc3 CM |
1048 | if (IS_ERR(*sub_root)) |
1049 | return PTR_ERR(*sub_root); | |
1050 | ||
1051 | ri = &(*sub_root)->root_item; | |
1052 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1053 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1054 | location->offset = 0; | |
1055 | ||
1056 | btrfs_free_path(path); | |
1057 | mutex_unlock(&root->fs_info->fs_mutex); | |
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1062 | { | |
1063 | struct btrfs_iget_args *args = p; | |
1064 | inode->i_ino = args->ino; | |
1065 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
1066 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1067 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1068 | return 0; |
1069 | } | |
1070 | ||
1071 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1072 | { | |
1073 | struct btrfs_iget_args *args = opaque; | |
1074 | return (args->ino == inode->i_ino && | |
1075 | args->root == BTRFS_I(inode)->root); | |
1076 | } | |
1077 | ||
1078 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
1079 | struct btrfs_root *root) | |
1080 | { | |
1081 | struct inode *inode; | |
1082 | struct btrfs_iget_args args; | |
1083 | args.ino = objectid; | |
1084 | args.root = root; | |
1085 | ||
1086 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1087 | btrfs_init_locked_inode, | |
1088 | (void *)&args); | |
1089 | return inode; | |
1090 | } | |
1091 | ||
1092 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1093 | struct nameidata *nd) | |
1094 | { | |
1095 | struct inode * inode; | |
1096 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1097 | struct btrfs_root *root = bi->root; | |
1098 | struct btrfs_root *sub_root = root; | |
1099 | struct btrfs_key location; | |
1100 | int ret; | |
1101 | ||
1102 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1103 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1104 | |
39279cc3 CM |
1105 | mutex_lock(&root->fs_info->fs_mutex); |
1106 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1107 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1108 | |
39279cc3 CM |
1109 | if (ret < 0) |
1110 | return ERR_PTR(ret); | |
5f39d397 | 1111 | |
39279cc3 CM |
1112 | inode = NULL; |
1113 | if (location.objectid) { | |
58176a96 JB |
1114 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1115 | dentry); | |
39279cc3 CM |
1116 | if (ret < 0) |
1117 | return ERR_PTR(ret); | |
1118 | if (ret > 0) | |
1119 | return ERR_PTR(-ENOENT); | |
1120 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1121 | sub_root); | |
1122 | if (!inode) | |
1123 | return ERR_PTR(-EACCES); | |
1124 | if (inode->i_state & I_NEW) { | |
1125 | /* the inode and parent dir are two different roots */ | |
1126 | if (sub_root != root) { | |
1127 | igrab(inode); | |
1128 | sub_root->inode = inode; | |
1129 | } | |
1130 | BTRFS_I(inode)->root = sub_root; | |
1131 | memcpy(&BTRFS_I(inode)->location, &location, | |
1132 | sizeof(location)); | |
1133 | btrfs_read_locked_inode(inode); | |
1134 | unlock_new_inode(inode); | |
1135 | } | |
1136 | } | |
1137 | return d_splice_alias(inode, dentry); | |
1138 | } | |
1139 | ||
39279cc3 CM |
1140 | static unsigned char btrfs_filetype_table[] = { |
1141 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1142 | }; | |
1143 | ||
1144 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1145 | { | |
6da6abae | 1146 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1147 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1148 | struct btrfs_item *item; | |
1149 | struct btrfs_dir_item *di; | |
1150 | struct btrfs_key key; | |
5f39d397 | 1151 | struct btrfs_key found_key; |
39279cc3 CM |
1152 | struct btrfs_path *path; |
1153 | int ret; | |
1154 | u32 nritems; | |
5f39d397 | 1155 | struct extent_buffer *leaf; |
39279cc3 CM |
1156 | int slot; |
1157 | int advance; | |
1158 | unsigned char d_type; | |
1159 | int over = 0; | |
1160 | u32 di_cur; | |
1161 | u32 di_total; | |
1162 | u32 di_len; | |
1163 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1164 | char tmp_name[32]; |
1165 | char *name_ptr; | |
1166 | int name_len; | |
39279cc3 CM |
1167 | |
1168 | /* FIXME, use a real flag for deciding about the key type */ | |
1169 | if (root->fs_info->tree_root == root) | |
1170 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1171 | |
3954401f CM |
1172 | /* special case for "." */ |
1173 | if (filp->f_pos == 0) { | |
1174 | over = filldir(dirent, ".", 1, | |
1175 | 1, inode->i_ino, | |
1176 | DT_DIR); | |
1177 | if (over) | |
1178 | return 0; | |
1179 | filp->f_pos = 1; | |
1180 | } | |
1181 | ||
39279cc3 CM |
1182 | mutex_lock(&root->fs_info->fs_mutex); |
1183 | key.objectid = inode->i_ino; | |
3954401f CM |
1184 | path = btrfs_alloc_path(); |
1185 | path->reada = 2; | |
1186 | ||
1187 | /* special case for .., just use the back ref */ | |
1188 | if (filp->f_pos == 1) { | |
1189 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1190 | key.offset = 0; | |
1191 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1192 | BUG_ON(ret == 0); | |
1193 | leaf = path->nodes[0]; | |
1194 | slot = path->slots[0]; | |
1195 | nritems = btrfs_header_nritems(leaf); | |
1196 | if (slot >= nritems) { | |
1197 | btrfs_release_path(root, path); | |
1198 | goto read_dir_items; | |
1199 | } | |
1200 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1201 | btrfs_release_path(root, path); | |
1202 | if (found_key.objectid != key.objectid || | |
1203 | found_key.type != BTRFS_INODE_REF_KEY) | |
1204 | goto read_dir_items; | |
1205 | over = filldir(dirent, "..", 2, | |
1206 | 2, found_key.offset, DT_DIR); | |
1207 | if (over) | |
1208 | goto nopos; | |
1209 | filp->f_pos = 2; | |
1210 | } | |
1211 | ||
1212 | read_dir_items: | |
39279cc3 CM |
1213 | btrfs_set_key_type(&key, key_type); |
1214 | key.offset = filp->f_pos; | |
5f39d397 | 1215 | |
39279cc3 CM |
1216 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1217 | if (ret < 0) | |
1218 | goto err; | |
1219 | advance = 0; | |
39279cc3 | 1220 | while(1) { |
5f39d397 CM |
1221 | leaf = path->nodes[0]; |
1222 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1223 | slot = path->slots[0]; |
1224 | if (advance || slot >= nritems) { | |
1225 | if (slot >= nritems -1) { | |
39279cc3 CM |
1226 | ret = btrfs_next_leaf(root, path); |
1227 | if (ret) | |
1228 | break; | |
5f39d397 CM |
1229 | leaf = path->nodes[0]; |
1230 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1231 | slot = path->slots[0]; |
1232 | } else { | |
1233 | slot++; | |
1234 | path->slots[0]++; | |
1235 | } | |
1236 | } | |
1237 | advance = 1; | |
5f39d397 CM |
1238 | item = btrfs_item_nr(leaf, slot); |
1239 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1240 | ||
1241 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1242 | break; |
5f39d397 | 1243 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1244 | break; |
5f39d397 | 1245 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1246 | continue; |
5f39d397 CM |
1247 | |
1248 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1249 | advance = 1; |
1250 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1251 | di_cur = 0; | |
5f39d397 | 1252 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1253 | while(di_cur < di_total) { |
5f39d397 CM |
1254 | struct btrfs_key location; |
1255 | ||
1256 | name_len = btrfs_dir_name_len(leaf, di); | |
1257 | if (name_len < 32) { | |
1258 | name_ptr = tmp_name; | |
1259 | } else { | |
1260 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1261 | BUG_ON(!name_ptr); | |
1262 | } | |
1263 | read_extent_buffer(leaf, name_ptr, | |
1264 | (unsigned long)(di + 1), name_len); | |
1265 | ||
1266 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1267 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1268 | ||
1269 | over = filldir(dirent, name_ptr, name_len, | |
1270 | found_key.offset, | |
1271 | location.objectid, | |
39279cc3 | 1272 | d_type); |
5f39d397 CM |
1273 | |
1274 | if (name_ptr != tmp_name) | |
1275 | kfree(name_ptr); | |
1276 | ||
39279cc3 CM |
1277 | if (over) |
1278 | goto nopos; | |
5103e947 JB |
1279 | di_len = btrfs_dir_name_len(leaf, di) + |
1280 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1281 | di_cur += di_len; |
1282 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1283 | } | |
1284 | } | |
1285 | filp->f_pos++; | |
1286 | nopos: | |
1287 | ret = 0; | |
1288 | err: | |
1289 | btrfs_release_path(root, path); | |
1290 | btrfs_free_path(path); | |
1291 | mutex_unlock(&root->fs_info->fs_mutex); | |
1292 | return ret; | |
1293 | } | |
1294 | ||
1295 | int btrfs_write_inode(struct inode *inode, int wait) | |
1296 | { | |
1297 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1298 | struct btrfs_trans_handle *trans; | |
1299 | int ret = 0; | |
1300 | ||
1301 | if (wait) { | |
1302 | mutex_lock(&root->fs_info->fs_mutex); | |
1303 | trans = btrfs_start_transaction(root, 1); | |
1304 | btrfs_set_trans_block_group(trans, inode); | |
1305 | ret = btrfs_commit_transaction(trans, root); | |
1306 | mutex_unlock(&root->fs_info->fs_mutex); | |
1307 | } | |
1308 | return ret; | |
1309 | } | |
1310 | ||
1311 | /* | |
54aa1f4d | 1312 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1313 | * inode changes. But, it is most likely to find the inode in cache. |
1314 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1315 | * to keep or drop this code. | |
1316 | */ | |
1317 | void btrfs_dirty_inode(struct inode *inode) | |
1318 | { | |
1319 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1320 | struct btrfs_trans_handle *trans; | |
1321 | ||
1322 | mutex_lock(&root->fs_info->fs_mutex); | |
1323 | trans = btrfs_start_transaction(root, 1); | |
1324 | btrfs_set_trans_block_group(trans, inode); | |
1325 | btrfs_update_inode(trans, root, inode); | |
1326 | btrfs_end_transaction(trans, root); | |
1327 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1328 | } |
1329 | ||
1330 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1331 | struct btrfs_root *root, | |
1332 | u64 objectid, | |
1333 | struct btrfs_block_group_cache *group, | |
1334 | int mode) | |
1335 | { | |
1336 | struct inode *inode; | |
5f39d397 | 1337 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1338 | struct btrfs_key *location; |
5f39d397 | 1339 | struct btrfs_path *path; |
39279cc3 CM |
1340 | int ret; |
1341 | int owner; | |
1342 | ||
5f39d397 CM |
1343 | path = btrfs_alloc_path(); |
1344 | BUG_ON(!path); | |
1345 | ||
39279cc3 CM |
1346 | inode = new_inode(root->fs_info->sb); |
1347 | if (!inode) | |
1348 | return ERR_PTR(-ENOMEM); | |
1349 | ||
b888db2b CM |
1350 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1351 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1352 | BTRFS_I(inode)->root = root; |
b888db2b | 1353 | |
39279cc3 CM |
1354 | if (mode & S_IFDIR) |
1355 | owner = 0; | |
1356 | else | |
1357 | owner = 1; | |
1358 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1359 | BTRFS_I(inode)->block_group = group; | |
1360 | ||
5f39d397 CM |
1361 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1362 | if (ret) | |
1363 | goto fail; | |
1364 | ||
39279cc3 CM |
1365 | inode->i_uid = current->fsuid; |
1366 | inode->i_gid = current->fsgid; | |
1367 | inode->i_mode = mode; | |
1368 | inode->i_ino = objectid; | |
1369 | inode->i_blocks = 0; | |
1370 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1371 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1372 | struct btrfs_inode_item); | |
1373 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1374 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1375 | btrfs_free_path(path); | |
1376 | ||
39279cc3 CM |
1377 | location = &BTRFS_I(inode)->location; |
1378 | location->objectid = objectid; | |
39279cc3 CM |
1379 | location->offset = 0; |
1380 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1381 | ||
39279cc3 CM |
1382 | insert_inode_hash(inode); |
1383 | return inode; | |
5f39d397 CM |
1384 | fail: |
1385 | btrfs_free_path(path); | |
1386 | return ERR_PTR(ret); | |
39279cc3 CM |
1387 | } |
1388 | ||
1389 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1390 | { | |
1391 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1392 | } | |
1393 | ||
1394 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1395 | struct dentry *dentry, struct inode *inode) | |
1396 | { | |
1397 | int ret; | |
1398 | struct btrfs_key key; | |
1399 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1400 | struct inode *parent_inode; |
5f39d397 | 1401 | |
39279cc3 | 1402 | key.objectid = inode->i_ino; |
39279cc3 CM |
1403 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1404 | key.offset = 0; | |
1405 | ||
1406 | ret = btrfs_insert_dir_item(trans, root, | |
1407 | dentry->d_name.name, dentry->d_name.len, | |
1408 | dentry->d_parent->d_inode->i_ino, | |
1409 | &key, btrfs_inode_type(inode)); | |
1410 | if (ret == 0) { | |
76fea00a CM |
1411 | ret = btrfs_insert_inode_ref(trans, root, |
1412 | dentry->d_name.name, | |
1413 | dentry->d_name.len, | |
1414 | inode->i_ino, | |
1415 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1416 | parent_inode = dentry->d_parent->d_inode; |
1417 | parent_inode->i_size += dentry->d_name.len * 2; | |
1418 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1419 | ret = btrfs_update_inode(trans, root, |
1420 | dentry->d_parent->d_inode); | |
1421 | } | |
1422 | return ret; | |
1423 | } | |
1424 | ||
1425 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1426 | struct dentry *dentry, struct inode *inode) | |
1427 | { | |
1428 | int err = btrfs_add_link(trans, dentry, inode); | |
1429 | if (!err) { | |
1430 | d_instantiate(dentry, inode); | |
1431 | return 0; | |
1432 | } | |
1433 | if (err > 0) | |
1434 | err = -EEXIST; | |
1435 | return err; | |
1436 | } | |
1437 | ||
618e21d5 JB |
1438 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1439 | int mode, dev_t rdev) | |
1440 | { | |
1441 | struct btrfs_trans_handle *trans; | |
1442 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1443 | struct inode *inode; | |
1444 | int err; | |
1445 | int drop_inode = 0; | |
1446 | u64 objectid; | |
d3c2fdcf | 1447 | unsigned long nr; |
618e21d5 JB |
1448 | |
1449 | if (!new_valid_dev(rdev)) | |
1450 | return -EINVAL; | |
1451 | ||
1452 | mutex_lock(&root->fs_info->fs_mutex); | |
1453 | trans = btrfs_start_transaction(root, 1); | |
1454 | btrfs_set_trans_block_group(trans, dir); | |
1455 | ||
1456 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1457 | if (err) { | |
1458 | err = -ENOSPC; | |
1459 | goto out_unlock; | |
1460 | } | |
1461 | ||
1462 | inode = btrfs_new_inode(trans, root, objectid, | |
1463 | BTRFS_I(dir)->block_group, mode); | |
1464 | err = PTR_ERR(inode); | |
1465 | if (IS_ERR(inode)) | |
1466 | goto out_unlock; | |
1467 | ||
1468 | btrfs_set_trans_block_group(trans, inode); | |
1469 | err = btrfs_add_nondir(trans, dentry, inode); | |
1470 | if (err) | |
1471 | drop_inode = 1; | |
1472 | else { | |
1473 | inode->i_op = &btrfs_special_inode_operations; | |
1474 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1475 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1476 | } |
1477 | dir->i_sb->s_dirt = 1; | |
1478 | btrfs_update_inode_block_group(trans, inode); | |
1479 | btrfs_update_inode_block_group(trans, dir); | |
1480 | out_unlock: | |
d3c2fdcf | 1481 | nr = trans->blocks_used; |
618e21d5 JB |
1482 | btrfs_end_transaction(trans, root); |
1483 | mutex_unlock(&root->fs_info->fs_mutex); | |
1484 | ||
1485 | if (drop_inode) { | |
1486 | inode_dec_link_count(inode); | |
1487 | iput(inode); | |
1488 | } | |
d3c2fdcf | 1489 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1490 | return err; |
1491 | } | |
1492 | ||
39279cc3 CM |
1493 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1494 | int mode, struct nameidata *nd) | |
1495 | { | |
1496 | struct btrfs_trans_handle *trans; | |
1497 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1498 | struct inode *inode; | |
1499 | int err; | |
1500 | int drop_inode = 0; | |
d3c2fdcf | 1501 | unsigned long nr; |
39279cc3 CM |
1502 | u64 objectid; |
1503 | ||
1504 | mutex_lock(&root->fs_info->fs_mutex); | |
1505 | trans = btrfs_start_transaction(root, 1); | |
1506 | btrfs_set_trans_block_group(trans, dir); | |
1507 | ||
1508 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1509 | if (err) { | |
1510 | err = -ENOSPC; | |
1511 | goto out_unlock; | |
1512 | } | |
1513 | ||
1514 | inode = btrfs_new_inode(trans, root, objectid, | |
1515 | BTRFS_I(dir)->block_group, mode); | |
1516 | err = PTR_ERR(inode); | |
1517 | if (IS_ERR(inode)) | |
1518 | goto out_unlock; | |
1519 | ||
1520 | btrfs_set_trans_block_group(trans, inode); | |
1521 | err = btrfs_add_nondir(trans, dentry, inode); | |
1522 | if (err) | |
1523 | drop_inode = 1; | |
1524 | else { | |
1525 | inode->i_mapping->a_ops = &btrfs_aops; | |
1526 | inode->i_fop = &btrfs_file_operations; | |
1527 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1528 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1529 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1530 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1531 | } |
1532 | dir->i_sb->s_dirt = 1; | |
1533 | btrfs_update_inode_block_group(trans, inode); | |
1534 | btrfs_update_inode_block_group(trans, dir); | |
1535 | out_unlock: | |
d3c2fdcf | 1536 | nr = trans->blocks_used; |
39279cc3 CM |
1537 | btrfs_end_transaction(trans, root); |
1538 | mutex_unlock(&root->fs_info->fs_mutex); | |
1539 | ||
1540 | if (drop_inode) { | |
1541 | inode_dec_link_count(inode); | |
1542 | iput(inode); | |
1543 | } | |
d3c2fdcf | 1544 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1545 | return err; |
1546 | } | |
1547 | ||
1548 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1549 | struct dentry *dentry) | |
1550 | { | |
1551 | struct btrfs_trans_handle *trans; | |
1552 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1553 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1554 | unsigned long nr; |
39279cc3 CM |
1555 | int err; |
1556 | int drop_inode = 0; | |
1557 | ||
1558 | if (inode->i_nlink == 0) | |
1559 | return -ENOENT; | |
1560 | ||
6da6abae CM |
1561 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1562 | inode->i_nlink++; | |
1563 | #else | |
39279cc3 | 1564 | inc_nlink(inode); |
6da6abae | 1565 | #endif |
39279cc3 CM |
1566 | mutex_lock(&root->fs_info->fs_mutex); |
1567 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1568 | |
39279cc3 CM |
1569 | btrfs_set_trans_block_group(trans, dir); |
1570 | atomic_inc(&inode->i_count); | |
1571 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1572 | |
39279cc3 CM |
1573 | if (err) |
1574 | drop_inode = 1; | |
5f39d397 | 1575 | |
39279cc3 CM |
1576 | dir->i_sb->s_dirt = 1; |
1577 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1578 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1579 | |
54aa1f4d CM |
1580 | if (err) |
1581 | drop_inode = 1; | |
39279cc3 | 1582 | |
d3c2fdcf | 1583 | nr = trans->blocks_used; |
39279cc3 CM |
1584 | btrfs_end_transaction(trans, root); |
1585 | mutex_unlock(&root->fs_info->fs_mutex); | |
1586 | ||
1587 | if (drop_inode) { | |
1588 | inode_dec_link_count(inode); | |
1589 | iput(inode); | |
1590 | } | |
d3c2fdcf | 1591 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1592 | return err; |
1593 | } | |
1594 | ||
39279cc3 CM |
1595 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1596 | { | |
1597 | struct inode *inode; | |
1598 | struct btrfs_trans_handle *trans; | |
1599 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1600 | int err = 0; | |
1601 | int drop_on_err = 0; | |
1602 | u64 objectid; | |
d3c2fdcf | 1603 | unsigned long nr = 1; |
39279cc3 CM |
1604 | |
1605 | mutex_lock(&root->fs_info->fs_mutex); | |
1606 | trans = btrfs_start_transaction(root, 1); | |
1607 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1608 | |
39279cc3 CM |
1609 | if (IS_ERR(trans)) { |
1610 | err = PTR_ERR(trans); | |
1611 | goto out_unlock; | |
1612 | } | |
1613 | ||
1614 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1615 | if (err) { | |
1616 | err = -ENOSPC; | |
1617 | goto out_unlock; | |
1618 | } | |
1619 | ||
1620 | inode = btrfs_new_inode(trans, root, objectid, | |
1621 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1622 | if (IS_ERR(inode)) { | |
1623 | err = PTR_ERR(inode); | |
1624 | goto out_fail; | |
1625 | } | |
5f39d397 | 1626 | |
39279cc3 CM |
1627 | drop_on_err = 1; |
1628 | inode->i_op = &btrfs_dir_inode_operations; | |
1629 | inode->i_fop = &btrfs_dir_file_operations; | |
1630 | btrfs_set_trans_block_group(trans, inode); | |
1631 | ||
3954401f | 1632 | inode->i_size = 0; |
39279cc3 CM |
1633 | err = btrfs_update_inode(trans, root, inode); |
1634 | if (err) | |
1635 | goto out_fail; | |
5f39d397 | 1636 | |
39279cc3 CM |
1637 | err = btrfs_add_link(trans, dentry, inode); |
1638 | if (err) | |
1639 | goto out_fail; | |
5f39d397 | 1640 | |
39279cc3 CM |
1641 | d_instantiate(dentry, inode); |
1642 | drop_on_err = 0; | |
1643 | dir->i_sb->s_dirt = 1; | |
1644 | btrfs_update_inode_block_group(trans, inode); | |
1645 | btrfs_update_inode_block_group(trans, dir); | |
1646 | ||
1647 | out_fail: | |
d3c2fdcf | 1648 | nr = trans->blocks_used; |
39279cc3 | 1649 | btrfs_end_transaction(trans, root); |
5f39d397 | 1650 | |
39279cc3 CM |
1651 | out_unlock: |
1652 | mutex_unlock(&root->fs_info->fs_mutex); | |
1653 | if (drop_on_err) | |
1654 | iput(inode); | |
d3c2fdcf | 1655 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1656 | return err; |
1657 | } | |
1658 | ||
a52d9a80 CM |
1659 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1660 | size_t page_offset, u64 start, u64 end, | |
1661 | int create) | |
1662 | { | |
1663 | int ret; | |
1664 | int err = 0; | |
db94535d | 1665 | u64 bytenr; |
a52d9a80 CM |
1666 | u64 extent_start = 0; |
1667 | u64 extent_end = 0; | |
1668 | u64 objectid = inode->i_ino; | |
1669 | u32 found_type; | |
1670 | int failed_insert = 0; | |
1671 | struct btrfs_path *path; | |
1672 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1673 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1674 | struct extent_buffer *leaf; |
1675 | struct btrfs_key found_key; | |
a52d9a80 CM |
1676 | struct extent_map *em = NULL; |
1677 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1678 | struct btrfs_trans_handle *trans = NULL; | |
1679 | ||
1680 | path = btrfs_alloc_path(); | |
1681 | BUG_ON(!path); | |
1682 | mutex_lock(&root->fs_info->fs_mutex); | |
1683 | ||
1684 | again: | |
1685 | em = lookup_extent_mapping(em_tree, start, end); | |
1686 | if (em) { | |
1687 | goto out; | |
1688 | } | |
1689 | if (!em) { | |
1690 | em = alloc_extent_map(GFP_NOFS); | |
1691 | if (!em) { | |
1692 | err = -ENOMEM; | |
1693 | goto out; | |
1694 | } | |
5f39d397 CM |
1695 | em->start = EXTENT_MAP_HOLE; |
1696 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1697 | } |
1698 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1699 | ret = btrfs_lookup_file_extent(trans, root, path, |
1700 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1701 | if (ret < 0) { |
1702 | err = ret; | |
1703 | goto out; | |
1704 | } | |
1705 | ||
1706 | if (ret != 0) { | |
1707 | if (path->slots[0] == 0) | |
1708 | goto not_found; | |
1709 | path->slots[0]--; | |
1710 | } | |
1711 | ||
5f39d397 CM |
1712 | leaf = path->nodes[0]; |
1713 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1714 | struct btrfs_file_extent_item); |
a52d9a80 | 1715 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1716 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1717 | found_type = btrfs_key_type(&found_key); | |
1718 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1719 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1720 | goto not_found; | |
1721 | } | |
1722 | ||
5f39d397 CM |
1723 | found_type = btrfs_file_extent_type(leaf, item); |
1724 | extent_start = found_key.offset; | |
a52d9a80 CM |
1725 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1726 | extent_end = extent_start + | |
db94535d | 1727 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1728 | err = 0; |
b888db2b | 1729 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1730 | em->start = start; |
1731 | if (start < extent_start) { | |
b888db2b CM |
1732 | if (end < extent_start) |
1733 | goto not_found; | |
a52d9a80 CM |
1734 | em->end = extent_end - 1; |
1735 | } else { | |
1736 | em->end = end; | |
1737 | } | |
1738 | goto not_found_em; | |
1739 | } | |
db94535d CM |
1740 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1741 | if (bytenr == 0) { | |
a52d9a80 CM |
1742 | em->start = extent_start; |
1743 | em->end = extent_end - 1; | |
5f39d397 CM |
1744 | em->block_start = EXTENT_MAP_HOLE; |
1745 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1746 | goto insert; |
1747 | } | |
db94535d CM |
1748 | bytenr += btrfs_file_extent_offset(leaf, item); |
1749 | em->block_start = bytenr; | |
a52d9a80 | 1750 | em->block_end = em->block_start + |
db94535d | 1751 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1752 | em->start = extent_start; |
1753 | em->end = extent_end - 1; | |
1754 | goto insert; | |
1755 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1756 | unsigned long ptr; |
a52d9a80 | 1757 | char *map; |
3326d1b0 CM |
1758 | size_t size; |
1759 | size_t extent_offset; | |
1760 | size_t copy_size; | |
a52d9a80 | 1761 | |
5f39d397 CM |
1762 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1763 | path->slots[0])); | |
689f9346 | 1764 | extent_end = (extent_start + size - 1) | |
db94535d | 1765 | ((u64)root->sectorsize - 1); |
b888db2b | 1766 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1767 | em->start = start; |
1768 | if (start < extent_start) { | |
b888db2b CM |
1769 | if (end < extent_start) |
1770 | goto not_found; | |
50b78c24 | 1771 | em->end = extent_end; |
a52d9a80 CM |
1772 | } else { |
1773 | em->end = end; | |
1774 | } | |
1775 | goto not_found_em; | |
1776 | } | |
689f9346 Y |
1777 | em->block_start = EXTENT_MAP_INLINE; |
1778 | em->block_end = EXTENT_MAP_INLINE; | |
1779 | ||
1780 | if (!page) { | |
1781 | em->start = extent_start; | |
1782 | em->end = extent_start + size - 1; | |
1783 | goto out; | |
1784 | } | |
5f39d397 | 1785 | |
35ebb934 | 1786 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1787 | extent_start + page_offset; |
ae2f5411 | 1788 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1789 | size - extent_offset); |
3326d1b0 CM |
1790 | em->start = extent_start + extent_offset; |
1791 | em->end = (em->start + copy_size -1) | | |
1792 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1793 | map = kmap(page); |
1794 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1795 | if (create == 0 && !PageUptodate(page)) { |
1796 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1797 | copy_size); | |
1798 | flush_dcache_page(page); | |
1799 | } else if (create && PageUptodate(page)) { | |
1800 | if (!trans) { | |
1801 | kunmap(page); | |
1802 | free_extent_map(em); | |
1803 | em = NULL; | |
1804 | btrfs_release_path(root, path); | |
1805 | trans = btrfs_start_transaction(root, 1); | |
1806 | goto again; | |
1807 | } | |
1808 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1809 | copy_size); | |
1810 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1811 | } |
a52d9a80 | 1812 | kunmap(page); |
3326d1b0 | 1813 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1814 | goto insert; |
1815 | } else { | |
1816 | printk("unkknown found_type %d\n", found_type); | |
1817 | WARN_ON(1); | |
1818 | } | |
1819 | not_found: | |
1820 | em->start = start; | |
1821 | em->end = end; | |
1822 | not_found_em: | |
5f39d397 CM |
1823 | em->block_start = EXTENT_MAP_HOLE; |
1824 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1825 | insert: |
1826 | btrfs_release_path(root, path); | |
1827 | if (em->start > start || em->end < start) { | |
b888db2b | 1828 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1829 | err = -EIO; |
1830 | goto out; | |
1831 | } | |
1832 | ret = add_extent_mapping(em_tree, em); | |
1833 | if (ret == -EEXIST) { | |
1834 | free_extent_map(em); | |
2bf5a725 | 1835 | em = NULL; |
6da6abae CM |
1836 | if (0 && failed_insert == 1) { |
1837 | btrfs_drop_extent_cache(inode, start, end); | |
1838 | } | |
a52d9a80 CM |
1839 | failed_insert++; |
1840 | if (failed_insert > 5) { | |
1841 | printk("failing to insert %Lu %Lu\n", start, end); | |
1842 | err = -EIO; | |
1843 | goto out; | |
1844 | } | |
a52d9a80 CM |
1845 | goto again; |
1846 | } | |
1847 | err = 0; | |
1848 | out: | |
1849 | btrfs_free_path(path); | |
1850 | if (trans) { | |
1851 | ret = btrfs_end_transaction(trans, root); | |
1852 | if (!err) | |
1853 | err = ret; | |
1854 | } | |
1855 | mutex_unlock(&root->fs_info->fs_mutex); | |
1856 | if (err) { | |
1857 | free_extent_map(em); | |
1858 | WARN_ON(1); | |
1859 | return ERR_PTR(err); | |
1860 | } | |
1861 | return em; | |
1862 | } | |
1863 | ||
d396c6f5 | 1864 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1865 | { |
d396c6f5 | 1866 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1867 | } |
1868 | ||
1869 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1870 | unsigned from, unsigned to) | |
1871 | { | |
a52d9a80 CM |
1872 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1873 | page->mapping->host, page, from, to, | |
1874 | btrfs_get_extent); | |
39279cc3 CM |
1875 | } |
1876 | ||
a52d9a80 | 1877 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1878 | { |
a52d9a80 CM |
1879 | struct extent_map_tree *tree; |
1880 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1881 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1882 | } |
a52d9a80 | 1883 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1884 | { |
a52d9a80 | 1885 | struct extent_map_tree *tree; |
b888db2b CM |
1886 | |
1887 | ||
1888 | if (current->flags & PF_MEMALLOC) { | |
1889 | redirty_page_for_writepage(wbc, page); | |
1890 | unlock_page(page); | |
1891 | return 0; | |
1892 | } | |
a52d9a80 CM |
1893 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1894 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1895 | } |
1896 | ||
b293f02e CM |
1897 | static int btrfs_writepages(struct address_space *mapping, |
1898 | struct writeback_control *wbc) | |
1899 | { | |
1900 | struct extent_map_tree *tree; | |
1901 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1902 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
1903 | } | |
1904 | ||
3ab2fb5a CM |
1905 | static int |
1906 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
1907 | struct list_head *pages, unsigned nr_pages) | |
1908 | { | |
1909 | struct extent_map_tree *tree; | |
1910 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1911 | return extent_readpages(tree, mapping, pages, nr_pages, | |
1912 | btrfs_get_extent); | |
1913 | } | |
1914 | ||
a52d9a80 | 1915 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1916 | { |
a52d9a80 CM |
1917 | struct extent_map_tree *tree; |
1918 | int ret; | |
8c2383c3 | 1919 | |
a52d9a80 CM |
1920 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1921 | ret = try_release_extent_mapping(tree, page); | |
1922 | if (ret == 1) { | |
1923 | ClearPagePrivate(page); | |
1924 | set_page_private(page, 0); | |
1925 | page_cache_release(page); | |
39279cc3 | 1926 | } |
a52d9a80 | 1927 | return ret; |
39279cc3 CM |
1928 | } |
1929 | ||
a52d9a80 | 1930 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1931 | { |
a52d9a80 | 1932 | struct extent_map_tree *tree; |
39279cc3 | 1933 | |
a52d9a80 CM |
1934 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1935 | extent_invalidatepage(tree, page, offset); | |
1936 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1937 | } |
1938 | ||
9ebefb18 CM |
1939 | /* |
1940 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1941 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1942 | * be careful to check for EOF conditions here. We set the page up correctly | |
1943 | * for a written page which means we get ENOSPC checking when writing into | |
1944 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1945 | * support these features. | |
1946 | * | |
1947 | * We are not allowed to take the i_mutex here so we have to play games to | |
1948 | * protect against truncate races as the page could now be beyond EOF. Because | |
1949 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1950 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1951 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1952 | * unlock the page. | |
1953 | */ | |
1954 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1955 | { | |
6da6abae | 1956 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
9ebefb18 CM |
1957 | unsigned long end; |
1958 | loff_t size; | |
1959 | int ret = -EINVAL; | |
a52d9a80 | 1960 | u64 page_start; |
9ebefb18 | 1961 | |
011410bd | 1962 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1963 | lock_page(page); |
1964 | wait_on_page_writeback(page); | |
9ebefb18 | 1965 | size = i_size_read(inode); |
35ebb934 | 1966 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 1967 | |
9ebefb18 | 1968 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1969 | (page_start > size)) { |
9ebefb18 CM |
1970 | /* page got truncated out from underneath us */ |
1971 | goto out_unlock; | |
1972 | } | |
1973 | ||
1974 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1975 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1976 | end = size & ~PAGE_CACHE_MASK; |
1977 | else | |
1978 | end = PAGE_CACHE_SIZE; | |
1979 | ||
b888db2b | 1980 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1981 | |
1982 | out_unlock: | |
011410bd | 1983 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1984 | unlock_page(page); |
1985 | return ret; | |
1986 | } | |
1987 | ||
39279cc3 CM |
1988 | static void btrfs_truncate(struct inode *inode) |
1989 | { | |
1990 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1991 | int ret; | |
1992 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1993 | unsigned long nr; |
39279cc3 CM |
1994 | |
1995 | if (!S_ISREG(inode->i_mode)) | |
1996 | return; | |
1997 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1998 | return; | |
1999 | ||
2000 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2001 | ||
2002 | mutex_lock(&root->fs_info->fs_mutex); | |
2003 | trans = btrfs_start_transaction(root, 1); | |
2004 | btrfs_set_trans_block_group(trans, inode); | |
2005 | ||
2006 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
2007 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 2008 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2009 | nr = trans->blocks_used; |
5f39d397 | 2010 | |
39279cc3 CM |
2011 | ret = btrfs_end_transaction(trans, root); |
2012 | BUG_ON(ret); | |
2013 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2014 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2015 | } |
2016 | ||
2017 | int btrfs_commit_write(struct file *file, struct page *page, | |
2018 | unsigned from, unsigned to) | |
2019 | { | |
e9906a98 CM |
2020 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
2021 | struct inode *inode = page->mapping->host; | |
2022 | ||
2023 | btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE); | |
2024 | ||
e9906a98 CM |
2025 | if (pos > inode->i_size) { |
2026 | i_size_write(inode, pos); | |
2027 | mark_inode_dirty(inode); | |
2028 | } | |
2029 | return 0; | |
39279cc3 CM |
2030 | } |
2031 | ||
2032 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
2033 | { | |
2034 | struct btrfs_trans_handle *trans; | |
2035 | struct btrfs_key key; | |
2036 | struct btrfs_root_item root_item; | |
2037 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2038 | struct extent_buffer *leaf; |
39279cc3 CM |
2039 | struct btrfs_root *new_root; |
2040 | struct inode *inode; | |
2041 | struct inode *dir; | |
2042 | int ret; | |
54aa1f4d | 2043 | int err; |
39279cc3 CM |
2044 | u64 objectid; |
2045 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2046 | unsigned long nr = 1; |
39279cc3 CM |
2047 | |
2048 | mutex_lock(&root->fs_info->fs_mutex); | |
2049 | trans = btrfs_start_transaction(root, 1); | |
2050 | BUG_ON(!trans); | |
2051 | ||
7bb86316 CM |
2052 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2053 | 0, &objectid); | |
2054 | if (ret) | |
2055 | goto fail; | |
2056 | ||
2057 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2058 | objectid, trans->transid, 0, 0, | |
2059 | 0, 0); | |
5f39d397 CM |
2060 | if (IS_ERR(leaf)) |
2061 | return PTR_ERR(leaf); | |
2062 | ||
2063 | btrfs_set_header_nritems(leaf, 0); | |
2064 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2065 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2066 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2067 | btrfs_set_header_owner(leaf, objectid); |
2068 | ||
5f39d397 CM |
2069 | write_extent_buffer(leaf, root->fs_info->fsid, |
2070 | (unsigned long)btrfs_header_fsid(leaf), | |
2071 | BTRFS_FSID_SIZE); | |
2072 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2073 | |
2074 | inode_item = &root_item.inode; | |
2075 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2076 | inode_item->generation = cpu_to_le64(1); |
2077 | inode_item->size = cpu_to_le64(3); | |
2078 | inode_item->nlink = cpu_to_le32(1); | |
2079 | inode_item->nblocks = cpu_to_le64(1); | |
2080 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2081 | |
db94535d CM |
2082 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2083 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2084 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2085 | btrfs_set_root_used(&root_item, 0); |
2086 | ||
5eda7b5e CM |
2087 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2088 | root_item.drop_level = 0; | |
5f39d397 CM |
2089 | |
2090 | free_extent_buffer(leaf); | |
2091 | leaf = NULL; | |
39279cc3 | 2092 | |
39279cc3 CM |
2093 | btrfs_set_root_dirid(&root_item, new_dirid); |
2094 | ||
2095 | key.objectid = objectid; | |
2096 | key.offset = 1; | |
39279cc3 CM |
2097 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2098 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2099 | &root_item); | |
54aa1f4d CM |
2100 | if (ret) |
2101 | goto fail; | |
39279cc3 CM |
2102 | |
2103 | /* | |
2104 | * insert the directory item | |
2105 | */ | |
2106 | key.offset = (u64)-1; | |
2107 | dir = root->fs_info->sb->s_root->d_inode; | |
2108 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2109 | name, namelen, dir->i_ino, &key, | |
2110 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2111 | if (ret) |
2112 | goto fail; | |
39279cc3 | 2113 | |
3954401f CM |
2114 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2115 | name, namelen, objectid, | |
2116 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2117 | if (ret) | |
2118 | goto fail; | |
2119 | ||
39279cc3 | 2120 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2121 | if (ret) |
2122 | goto fail_commit; | |
39279cc3 | 2123 | |
58176a96 | 2124 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2125 | BUG_ON(!new_root); |
2126 | ||
2127 | trans = btrfs_start_transaction(new_root, 1); | |
2128 | BUG_ON(!trans); | |
2129 | ||
2130 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2131 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2132 | if (IS_ERR(inode)) |
2133 | goto fail; | |
39279cc3 CM |
2134 | inode->i_op = &btrfs_dir_inode_operations; |
2135 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2136 | new_root->inode = inode; |
39279cc3 | 2137 | |
3954401f CM |
2138 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2139 | new_dirid); | |
39279cc3 | 2140 | inode->i_nlink = 1; |
3954401f | 2141 | inode->i_size = 0; |
39279cc3 | 2142 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2143 | if (ret) |
2144 | goto fail; | |
2145 | fail: | |
d3c2fdcf | 2146 | nr = trans->blocks_used; |
54aa1f4d CM |
2147 | err = btrfs_commit_transaction(trans, root); |
2148 | if (err && !ret) | |
2149 | ret = err; | |
2150 | fail_commit: | |
39279cc3 | 2151 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2152 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2153 | return ret; |
39279cc3 CM |
2154 | } |
2155 | ||
2156 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2157 | { | |
2158 | struct btrfs_trans_handle *trans; | |
2159 | struct btrfs_key key; | |
2160 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2161 | struct extent_buffer *tmp; |
39279cc3 | 2162 | int ret; |
54aa1f4d | 2163 | int err; |
39279cc3 | 2164 | u64 objectid; |
d3c2fdcf | 2165 | unsigned long nr; |
39279cc3 CM |
2166 | |
2167 | if (!root->ref_cows) | |
2168 | return -EINVAL; | |
2169 | ||
011410bd CM |
2170 | down_write(&root->snap_sem); |
2171 | freeze_bdev(root->fs_info->sb->s_bdev); | |
2172 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
2173 | ||
39279cc3 CM |
2174 | mutex_lock(&root->fs_info->fs_mutex); |
2175 | trans = btrfs_start_transaction(root, 1); | |
2176 | BUG_ON(!trans); | |
2177 | ||
2178 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2179 | if (ret) |
2180 | goto fail; | |
39279cc3 CM |
2181 | |
2182 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2183 | 0, &objectid); | |
54aa1f4d CM |
2184 | if (ret) |
2185 | goto fail; | |
39279cc3 CM |
2186 | |
2187 | memcpy(&new_root_item, &root->root_item, | |
2188 | sizeof(new_root_item)); | |
2189 | ||
2190 | key.objectid = objectid; | |
2191 | key.offset = 1; | |
39279cc3 | 2192 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
be20aa9d | 2193 | |
9691975d | 2194 | extent_buffer_get(root->node); |
83df7c1d | 2195 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2196 | free_extent_buffer(tmp); |
be20aa9d CM |
2197 | |
2198 | btrfs_copy_root(trans, root, root->node, &tmp, objectid); | |
2199 | ||
2200 | btrfs_set_root_bytenr(&new_root_item, tmp->start); | |
2201 | btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp)); | |
39279cc3 CM |
2202 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2203 | &new_root_item); | |
be20aa9d | 2204 | free_extent_buffer(tmp); |
54aa1f4d CM |
2205 | if (ret) |
2206 | goto fail; | |
39279cc3 CM |
2207 | |
2208 | /* | |
2209 | * insert the directory item | |
2210 | */ | |
2211 | key.offset = (u64)-1; | |
2212 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2213 | name, namelen, | |
2214 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2215 | &key, BTRFS_FT_DIR); | |
2216 | ||
54aa1f4d CM |
2217 | if (ret) |
2218 | goto fail; | |
39279cc3 | 2219 | |
3954401f CM |
2220 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2221 | name, namelen, objectid, | |
2222 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2223 | ||
2224 | if (ret) | |
2225 | goto fail; | |
54aa1f4d | 2226 | fail: |
d3c2fdcf | 2227 | nr = trans->blocks_used; |
54aa1f4d | 2228 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2229 | |
54aa1f4d CM |
2230 | if (err && !ret) |
2231 | ret = err; | |
5f39d397 | 2232 | |
39279cc3 | 2233 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2234 | up_write(&root->snap_sem); |
d3c2fdcf | 2235 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2236 | return ret; |
39279cc3 CM |
2237 | } |
2238 | ||
86479a04 CM |
2239 | static unsigned long force_ra(struct address_space *mapping, |
2240 | struct file_ra_state *ra, struct file *file, | |
2241 | pgoff_t offset, pgoff_t last_index) | |
2242 | { | |
2243 | pgoff_t req_size; | |
2244 | ||
2245 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2246 | req_size = last_index - offset + 1; | |
2247 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2248 | return offset; | |
2249 | #else | |
2250 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2251 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2252 | return offset + req_size; | |
2253 | #endif | |
2254 | } | |
2255 | ||
2256 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2257 | struct inode *inode = fdentry(file)->d_inode; |
86479a04 CM |
2258 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
2259 | struct page *page; | |
2260 | unsigned long last_index; | |
2261 | unsigned long ra_index = 0; | |
2262 | u64 page_start; | |
2263 | u64 page_end; | |
2264 | unsigned long i; | |
2265 | ||
2266 | mutex_lock(&inode->i_mutex); | |
2267 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2268 | for (i = 0; i <= last_index; i++) { | |
2269 | if (i == ra_index) { | |
2270 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2271 | file, ra_index, last_index); | |
2272 | } | |
2273 | page = grab_cache_page(inode->i_mapping, i); | |
2274 | if (!page) | |
2275 | goto out_unlock; | |
2276 | if (!PageUptodate(page)) { | |
2277 | btrfs_readpage(NULL, page); | |
2278 | lock_page(page); | |
2279 | if (!PageUptodate(page)) { | |
2280 | unlock_page(page); | |
2281 | page_cache_release(page); | |
2282 | goto out_unlock; | |
2283 | } | |
2284 | } | |
35ebb934 | 2285 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2286 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2287 | ||
2288 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2289 | set_extent_delalloc(em_tree, page_start, | |
2290 | page_end, GFP_NOFS); | |
2291 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2292 | set_page_dirty(page); | |
2293 | unlock_page(page); | |
2294 | page_cache_release(page); | |
2295 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2296 | } | |
2297 | ||
2298 | out_unlock: | |
2299 | mutex_unlock(&inode->i_mutex); | |
2300 | return 0; | |
2301 | } | |
2302 | ||
d03581f4 | 2303 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2304 | { |
4aec2b52 | 2305 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2306 | struct btrfs_dir_item *di; |
39279cc3 CM |
2307 | struct btrfs_path *path; |
2308 | u64 root_dirid; | |
4aec2b52 CM |
2309 | int namelen; |
2310 | int ret; | |
39279cc3 | 2311 | |
4aec2b52 | 2312 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2313 | |
4aec2b52 CM |
2314 | if (!vol_args) |
2315 | return -ENOMEM; | |
2316 | ||
2317 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2318 | ret = -EFAULT; | |
2319 | goto out; | |
2320 | } | |
2321 | ||
2322 | namelen = strlen(vol_args->name); | |
2323 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2324 | ret = -EINVAL; | |
2325 | goto out; | |
2326 | } | |
2327 | if (strchr(vol_args->name, '/')) { | |
2328 | ret = -EINVAL; | |
2329 | goto out; | |
2330 | } | |
d03581f4 CH |
2331 | |
2332 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2333 | if (!path) { |
2334 | ret = -ENOMEM; | |
2335 | goto out; | |
2336 | } | |
d03581f4 CH |
2337 | |
2338 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2339 | mutex_lock(&root->fs_info->fs_mutex); | |
2340 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2341 | path, root_dirid, | |
4aec2b52 | 2342 | vol_args->name, namelen, 0); |
d03581f4 CH |
2343 | mutex_unlock(&root->fs_info->fs_mutex); |
2344 | btrfs_free_path(path); | |
4aec2b52 CM |
2345 | |
2346 | if (di && !IS_ERR(di)) { | |
2347 | ret = -EEXIST; | |
2348 | goto out; | |
2349 | } | |
2350 | ||
2351 | if (IS_ERR(di)) { | |
2352 | ret = PTR_ERR(di); | |
2353 | goto out; | |
2354 | } | |
d03581f4 CH |
2355 | |
2356 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2357 | ret = create_subvol(root, vol_args->name, namelen); |
2358 | else | |
2359 | ret = create_snapshot(root, vol_args->name, namelen); | |
2360 | out: | |
2361 | kfree(vol_args); | |
2362 | return ret; | |
d03581f4 CH |
2363 | } |
2364 | ||
2365 | static int btrfs_ioctl_defrag(struct file *file) | |
2366 | { | |
6da6abae | 2367 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2368 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2369 | ||
2370 | switch (inode->i_mode & S_IFMT) { | |
2371 | case S_IFDIR: | |
39279cc3 | 2372 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2373 | btrfs_defrag_root(root, 0); |
2374 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2375 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2376 | break; |
d03581f4 CH |
2377 | case S_IFREG: |
2378 | btrfs_defrag_file(file); | |
2379 | break; | |
2380 | } | |
2381 | ||
2382 | return 0; | |
2383 | } | |
6702ed49 | 2384 | |
d03581f4 CH |
2385 | long btrfs_ioctl(struct file *file, unsigned int |
2386 | cmd, unsigned long arg) | |
2387 | { | |
6da6abae | 2388 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2389 | |
2390 | switch (cmd) { | |
2391 | case BTRFS_IOC_SNAP_CREATE: | |
2392 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2393 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2394 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2395 | } |
d03581f4 CH |
2396 | |
2397 | return -ENOTTY; | |
39279cc3 CM |
2398 | } |
2399 | ||
39279cc3 CM |
2400 | /* |
2401 | * Called inside transaction, so use GFP_NOFS | |
2402 | */ | |
2403 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2404 | { | |
2405 | struct btrfs_inode *ei; | |
2406 | ||
2407 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2408 | if (!ei) | |
2409 | return NULL; | |
15ee9bc7 | 2410 | ei->last_trans = 0; |
39279cc3 CM |
2411 | return &ei->vfs_inode; |
2412 | } | |
2413 | ||
2414 | void btrfs_destroy_inode(struct inode *inode) | |
2415 | { | |
2416 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2417 | WARN_ON(inode->i_data.nrpages); | |
2418 | ||
2419 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2420 | } | |
2421 | ||
44ec0b71 CM |
2422 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2423 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2424 | #else | |
39279cc3 CM |
2425 | static void init_once(void * foo, struct kmem_cache * cachep, |
2426 | unsigned long flags) | |
44ec0b71 | 2427 | #endif |
39279cc3 CM |
2428 | { |
2429 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2430 | ||
2431 | inode_init_once(&ei->vfs_inode); | |
2432 | } | |
2433 | ||
2434 | void btrfs_destroy_cachep(void) | |
2435 | { | |
2436 | if (btrfs_inode_cachep) | |
2437 | kmem_cache_destroy(btrfs_inode_cachep); | |
2438 | if (btrfs_trans_handle_cachep) | |
2439 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2440 | if (btrfs_transaction_cachep) | |
2441 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2442 | if (btrfs_bit_radix_cachep) | |
2443 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2444 | if (btrfs_path_cachep) | |
2445 | kmem_cache_destroy(btrfs_path_cachep); | |
2446 | } | |
2447 | ||
86479a04 | 2448 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2449 | unsigned long extra_flags, |
44ec0b71 CM |
2450 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2451 | void (*ctor)(struct kmem_cache *, void *) | |
2452 | #else | |
92fee66d | 2453 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2454 | unsigned long) |
2455 | #endif | |
2456 | ) | |
92fee66d CM |
2457 | { |
2458 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2459 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2460 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2461 | ,NULL | |
2462 | #endif | |
2463 | ); | |
2464 | } | |
2465 | ||
39279cc3 CM |
2466 | int btrfs_init_cachep(void) |
2467 | { | |
86479a04 | 2468 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2469 | sizeof(struct btrfs_inode), |
2470 | 0, init_once); | |
39279cc3 CM |
2471 | if (!btrfs_inode_cachep) |
2472 | goto fail; | |
86479a04 CM |
2473 | btrfs_trans_handle_cachep = |
2474 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2475 | sizeof(struct btrfs_trans_handle), | |
2476 | 0, NULL); | |
39279cc3 CM |
2477 | if (!btrfs_trans_handle_cachep) |
2478 | goto fail; | |
86479a04 | 2479 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2480 | sizeof(struct btrfs_transaction), |
92fee66d | 2481 | 0, NULL); |
39279cc3 CM |
2482 | if (!btrfs_transaction_cachep) |
2483 | goto fail; | |
86479a04 | 2484 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2485 | sizeof(struct btrfs_path), |
92fee66d | 2486 | 0, NULL); |
39279cc3 CM |
2487 | if (!btrfs_path_cachep) |
2488 | goto fail; | |
86479a04 | 2489 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2490 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2491 | if (!btrfs_bit_radix_cachep) |
2492 | goto fail; | |
2493 | return 0; | |
2494 | fail: | |
2495 | btrfs_destroy_cachep(); | |
2496 | return -ENOMEM; | |
2497 | } | |
2498 | ||
2499 | static int btrfs_getattr(struct vfsmount *mnt, | |
2500 | struct dentry *dentry, struct kstat *stat) | |
2501 | { | |
2502 | struct inode *inode = dentry->d_inode; | |
2503 | generic_fillattr(inode, stat); | |
2504 | stat->blksize = 256 * 1024; | |
2505 | return 0; | |
2506 | } | |
2507 | ||
2508 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2509 | struct inode * new_dir,struct dentry *new_dentry) | |
2510 | { | |
2511 | struct btrfs_trans_handle *trans; | |
2512 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2513 | struct inode *new_inode = new_dentry->d_inode; | |
2514 | struct inode *old_inode = old_dentry->d_inode; | |
2515 | struct timespec ctime = CURRENT_TIME; | |
2516 | struct btrfs_path *path; | |
39279cc3 CM |
2517 | int ret; |
2518 | ||
2519 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2520 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2521 | return -ENOTEMPTY; | |
2522 | } | |
5f39d397 | 2523 | |
39279cc3 CM |
2524 | mutex_lock(&root->fs_info->fs_mutex); |
2525 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 2526 | |
39279cc3 CM |
2527 | btrfs_set_trans_block_group(trans, new_dir); |
2528 | path = btrfs_alloc_path(); | |
2529 | if (!path) { | |
2530 | ret = -ENOMEM; | |
2531 | goto out_fail; | |
2532 | } | |
2533 | ||
2534 | old_dentry->d_inode->i_nlink++; | |
2535 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2536 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2537 | old_inode->i_ctime = ctime; | |
5f39d397 | 2538 | |
39279cc3 CM |
2539 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2540 | if (ret) | |
2541 | goto out_fail; | |
2542 | ||
2543 | if (new_inode) { | |
2544 | new_inode->i_ctime = CURRENT_TIME; | |
2545 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2546 | if (ret) | |
2547 | goto out_fail; | |
39279cc3 CM |
2548 | } |
2549 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2550 | if (ret) | |
2551 | goto out_fail; | |
2552 | ||
2553 | out_fail: | |
2554 | btrfs_free_path(path); | |
2555 | btrfs_end_transaction(trans, root); | |
2556 | mutex_unlock(&root->fs_info->fs_mutex); | |
2557 | return ret; | |
2558 | } | |
2559 | ||
2560 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2561 | const char *symname) | |
2562 | { | |
2563 | struct btrfs_trans_handle *trans; | |
2564 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2565 | struct btrfs_path *path; | |
2566 | struct btrfs_key key; | |
2567 | struct inode *inode; | |
2568 | int err; | |
2569 | int drop_inode = 0; | |
2570 | u64 objectid; | |
2571 | int name_len; | |
2572 | int datasize; | |
5f39d397 | 2573 | unsigned long ptr; |
39279cc3 | 2574 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2575 | struct extent_buffer *leaf; |
d3c2fdcf | 2576 | unsigned long nr; |
39279cc3 CM |
2577 | |
2578 | name_len = strlen(symname) + 1; | |
2579 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2580 | return -ENAMETOOLONG; | |
2581 | mutex_lock(&root->fs_info->fs_mutex); | |
2582 | trans = btrfs_start_transaction(root, 1); | |
2583 | btrfs_set_trans_block_group(trans, dir); | |
2584 | ||
2585 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2586 | if (err) { | |
2587 | err = -ENOSPC; | |
2588 | goto out_unlock; | |
2589 | } | |
2590 | ||
2591 | inode = btrfs_new_inode(trans, root, objectid, | |
2592 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2593 | err = PTR_ERR(inode); | |
2594 | if (IS_ERR(inode)) | |
2595 | goto out_unlock; | |
2596 | ||
2597 | btrfs_set_trans_block_group(trans, inode); | |
2598 | err = btrfs_add_nondir(trans, dentry, inode); | |
2599 | if (err) | |
2600 | drop_inode = 1; | |
2601 | else { | |
2602 | inode->i_mapping->a_ops = &btrfs_aops; | |
2603 | inode->i_fop = &btrfs_file_operations; | |
2604 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2605 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2606 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2607 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2608 | } |
2609 | dir->i_sb->s_dirt = 1; | |
2610 | btrfs_update_inode_block_group(trans, inode); | |
2611 | btrfs_update_inode_block_group(trans, dir); | |
2612 | if (drop_inode) | |
2613 | goto out_unlock; | |
2614 | ||
2615 | path = btrfs_alloc_path(); | |
2616 | BUG_ON(!path); | |
2617 | key.objectid = inode->i_ino; | |
2618 | key.offset = 0; | |
39279cc3 CM |
2619 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2620 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2621 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2622 | datasize); | |
54aa1f4d CM |
2623 | if (err) { |
2624 | drop_inode = 1; | |
2625 | goto out_unlock; | |
2626 | } | |
5f39d397 CM |
2627 | leaf = path->nodes[0]; |
2628 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2629 | struct btrfs_file_extent_item); | |
2630 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2631 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2632 | BTRFS_FILE_EXTENT_INLINE); |
2633 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2634 | write_extent_buffer(leaf, symname, ptr, name_len); |
2635 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2636 | btrfs_free_path(path); |
5f39d397 | 2637 | |
39279cc3 CM |
2638 | inode->i_op = &btrfs_symlink_inode_operations; |
2639 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2640 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2641 | err = btrfs_update_inode(trans, root, inode); |
2642 | if (err) | |
2643 | drop_inode = 1; | |
39279cc3 CM |
2644 | |
2645 | out_unlock: | |
d3c2fdcf | 2646 | nr = trans->blocks_used; |
39279cc3 CM |
2647 | btrfs_end_transaction(trans, root); |
2648 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2649 | if (drop_inode) { |
2650 | inode_dec_link_count(inode); | |
2651 | iput(inode); | |
2652 | } | |
d3c2fdcf | 2653 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2654 | return err; |
2655 | } | |
2656 | ||
2657 | static struct inode_operations btrfs_dir_inode_operations = { | |
2658 | .lookup = btrfs_lookup, | |
2659 | .create = btrfs_create, | |
2660 | .unlink = btrfs_unlink, | |
2661 | .link = btrfs_link, | |
2662 | .mkdir = btrfs_mkdir, | |
2663 | .rmdir = btrfs_rmdir, | |
2664 | .rename = btrfs_rename, | |
2665 | .symlink = btrfs_symlink, | |
2666 | .setattr = btrfs_setattr, | |
618e21d5 | 2667 | .mknod = btrfs_mknod, |
5103e947 JB |
2668 | .setxattr = generic_setxattr, |
2669 | .getxattr = generic_getxattr, | |
2670 | .listxattr = btrfs_listxattr, | |
2671 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2672 | }; |
2673 | ||
2674 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2675 | .lookup = btrfs_lookup, | |
2676 | }; | |
2677 | ||
2678 | static struct file_operations btrfs_dir_file_operations = { | |
2679 | .llseek = generic_file_llseek, | |
2680 | .read = generic_read_dir, | |
2681 | .readdir = btrfs_readdir, | |
34287aa3 | 2682 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2683 | #ifdef CONFIG_COMPAT |
34287aa3 | 2684 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2685 | #endif |
2686 | }; | |
2687 | ||
07157aac CM |
2688 | static struct extent_map_ops btrfs_extent_map_ops = { |
2689 | .fill_delalloc = run_delalloc_range, | |
2690 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2691 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2692 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2693 | }; | |
2694 | ||
39279cc3 CM |
2695 | static struct address_space_operations btrfs_aops = { |
2696 | .readpage = btrfs_readpage, | |
2697 | .writepage = btrfs_writepage, | |
b293f02e | 2698 | .writepages = btrfs_writepages, |
3ab2fb5a | 2699 | .readpages = btrfs_readpages, |
39279cc3 CM |
2700 | .sync_page = block_sync_page, |
2701 | .prepare_write = btrfs_prepare_write, | |
2702 | .commit_write = btrfs_commit_write, | |
2703 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2704 | .invalidatepage = btrfs_invalidatepage, |
2705 | .releasepage = btrfs_releasepage, | |
2706 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2707 | }; |
2708 | ||
2709 | static struct address_space_operations btrfs_symlink_aops = { | |
2710 | .readpage = btrfs_readpage, | |
2711 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2712 | .invalidatepage = btrfs_invalidatepage, |
2713 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2714 | }; |
2715 | ||
2716 | static struct inode_operations btrfs_file_inode_operations = { | |
2717 | .truncate = btrfs_truncate, | |
2718 | .getattr = btrfs_getattr, | |
2719 | .setattr = btrfs_setattr, | |
5103e947 JB |
2720 | .setxattr = generic_setxattr, |
2721 | .getxattr = generic_getxattr, | |
2722 | .listxattr = btrfs_listxattr, | |
2723 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2724 | }; |
2725 | ||
618e21d5 JB |
2726 | static struct inode_operations btrfs_special_inode_operations = { |
2727 | .getattr = btrfs_getattr, | |
2728 | .setattr = btrfs_setattr, | |
2729 | }; | |
2730 | ||
39279cc3 CM |
2731 | static struct inode_operations btrfs_symlink_inode_operations = { |
2732 | .readlink = generic_readlink, | |
2733 | .follow_link = page_follow_link_light, | |
2734 | .put_link = page_put_link, | |
2735 | }; |