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Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
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 CM |
534 | btrfs_update_inode(trans, root, dir); |
535 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 536 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
537 | dir->i_sb->s_dirt = 1; |
538 | } | |
539 | return ret; | |
540 | } | |
541 | ||
542 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
543 | { | |
544 | struct btrfs_root *root; | |
545 | struct btrfs_trans_handle *trans; | |
546 | int ret; | |
d3c2fdcf | 547 | unsigned long nr; |
39279cc3 CM |
548 | |
549 | root = BTRFS_I(dir)->root; | |
550 | mutex_lock(&root->fs_info->fs_mutex); | |
551 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 552 | |
39279cc3 CM |
553 | btrfs_set_trans_block_group(trans, dir); |
554 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 555 | nr = trans->blocks_used; |
5f39d397 | 556 | |
39279cc3 CM |
557 | btrfs_end_transaction(trans, root); |
558 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 559 | btrfs_btree_balance_dirty(root, nr); |
5f39d397 | 560 | |
39279cc3 CM |
561 | return ret; |
562 | } | |
563 | ||
564 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
565 | { | |
566 | struct inode *inode = dentry->d_inode; | |
567 | int err; | |
568 | int ret; | |
569 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 570 | struct btrfs_trans_handle *trans; |
d3c2fdcf | 571 | unsigned long nr; |
39279cc3 | 572 | |
134d4512 Y |
573 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
574 | return -ENOTEMPTY; | |
575 | ||
39279cc3 CM |
576 | mutex_lock(&root->fs_info->fs_mutex); |
577 | trans = btrfs_start_transaction(root, 1); | |
578 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
579 | |
580 | /* now the directory is empty */ | |
581 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
582 | if (!err) { | |
583 | inode->i_size = 0; | |
584 | } | |
3954401f | 585 | |
d3c2fdcf | 586 | nr = trans->blocks_used; |
39279cc3 | 587 | ret = btrfs_end_transaction(trans, root); |
134d4512 | 588 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 589 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 590 | |
39279cc3 CM |
591 | if (ret && !err) |
592 | err = ret; | |
593 | return err; | |
594 | } | |
595 | ||
596 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
597 | struct btrfs_root *root, | |
598 | struct inode *inode) | |
599 | { | |
600 | struct btrfs_path *path; | |
601 | int ret; | |
602 | ||
603 | clear_inode(inode); | |
604 | ||
605 | path = btrfs_alloc_path(); | |
606 | BUG_ON(!path); | |
39279cc3 CM |
607 | ret = btrfs_lookup_inode(trans, root, path, |
608 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
609 | if (ret > 0) |
610 | ret = -ENOENT; | |
611 | if (!ret) | |
612 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
613 | btrfs_free_path(path); |
614 | return ret; | |
615 | } | |
616 | ||
39279cc3 CM |
617 | /* |
618 | * this can truncate away extent items, csum items and directory items. | |
619 | * It starts at a high offset and removes keys until it can't find | |
620 | * any higher than i_size. | |
621 | * | |
622 | * csum items that cross the new i_size are truncated to the new size | |
623 | * as well. | |
624 | */ | |
625 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
626 | struct btrfs_root *root, | |
627 | struct inode *inode) | |
628 | { | |
629 | int ret; | |
630 | struct btrfs_path *path; | |
631 | struct btrfs_key key; | |
5f39d397 | 632 | struct btrfs_key found_key; |
39279cc3 | 633 | u32 found_type; |
5f39d397 | 634 | struct extent_buffer *leaf; |
39279cc3 CM |
635 | struct btrfs_file_extent_item *fi; |
636 | u64 extent_start = 0; | |
db94535d | 637 | u64 extent_num_bytes = 0; |
39279cc3 | 638 | u64 item_end = 0; |
7bb86316 | 639 | u64 root_gen = 0; |
d8d5f3e1 | 640 | u64 root_owner = 0; |
39279cc3 CM |
641 | int found_extent; |
642 | int del_item; | |
179e29e4 | 643 | int extent_type = -1; |
39279cc3 | 644 | |
a52d9a80 | 645 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 646 | path = btrfs_alloc_path(); |
3c69faec | 647 | path->reada = -1; |
39279cc3 | 648 | BUG_ON(!path); |
5f39d397 | 649 | |
39279cc3 CM |
650 | /* FIXME, add redo link to tree so we don't leak on crash */ |
651 | key.objectid = inode->i_ino; | |
652 | key.offset = (u64)-1; | |
5f39d397 CM |
653 | key.type = (u8)-1; |
654 | ||
39279cc3 CM |
655 | while(1) { |
656 | btrfs_init_path(path); | |
657 | fi = NULL; | |
658 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
659 | if (ret < 0) { | |
660 | goto error; | |
661 | } | |
662 | if (ret > 0) { | |
663 | BUG_ON(path->slots[0] == 0); | |
664 | path->slots[0]--; | |
665 | } | |
5f39d397 CM |
666 | leaf = path->nodes[0]; |
667 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
668 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 669 | |
5f39d397 | 670 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 671 | break; |
5f39d397 | 672 | |
39279cc3 CM |
673 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
674 | found_type != BTRFS_DIR_ITEM_KEY && | |
675 | found_type != BTRFS_DIR_INDEX_KEY && | |
676 | found_type != BTRFS_EXTENT_DATA_KEY) | |
677 | break; | |
678 | ||
5f39d397 | 679 | item_end = found_key.offset; |
39279cc3 | 680 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 681 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 682 | struct btrfs_file_extent_item); |
179e29e4 CM |
683 | extent_type = btrfs_file_extent_type(leaf, fi); |
684 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 685 | item_end += |
db94535d | 686 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
687 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
688 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
689 | path->slots[0]); | |
690 | item_end += btrfs_file_extent_inline_len(leaf, | |
691 | item); | |
39279cc3 | 692 | } |
008630c1 | 693 | item_end--; |
39279cc3 CM |
694 | } |
695 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
696 | ret = btrfs_csum_truncate(trans, root, path, | |
697 | inode->i_size); | |
698 | BUG_ON(ret); | |
699 | } | |
008630c1 | 700 | if (item_end < inode->i_size) { |
b888db2b CM |
701 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
702 | found_type = BTRFS_INODE_ITEM_KEY; | |
703 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
704 | found_type = BTRFS_CSUM_ITEM_KEY; | |
705 | } else if (found_type) { | |
706 | found_type--; | |
707 | } else { | |
708 | break; | |
39279cc3 | 709 | } |
a61721d5 | 710 | btrfs_set_key_type(&key, found_type); |
65555a06 | 711 | btrfs_release_path(root, path); |
b888db2b | 712 | continue; |
39279cc3 | 713 | } |
5f39d397 | 714 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
715 | del_item = 1; |
716 | else | |
717 | del_item = 0; | |
718 | found_extent = 0; | |
719 | ||
720 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
721 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
722 | goto delete; | |
723 | ||
724 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 725 | u64 num_dec; |
db94535d | 726 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 727 | if (!del_item) { |
db94535d CM |
728 | u64 orig_num_bytes = |
729 | btrfs_file_extent_num_bytes(leaf, fi); | |
730 | extent_num_bytes = inode->i_size - | |
5f39d397 | 731 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
732 | btrfs_set_file_extent_num_bytes(leaf, fi, |
733 | extent_num_bytes); | |
734 | num_dec = (orig_num_bytes - | |
735 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
736 | if (extent_start != 0) { |
737 | inode->i_blocks -= num_dec; | |
738 | } | |
5f39d397 | 739 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 740 | } else { |
db94535d CM |
741 | extent_num_bytes = |
742 | btrfs_file_extent_disk_num_bytes(leaf, | |
743 | fi); | |
39279cc3 | 744 | /* FIXME blocksize != 4096 */ |
db94535d CM |
745 | num_dec = btrfs_file_extent_num_bytes(leaf, |
746 | fi) >> 9; | |
39279cc3 CM |
747 | if (extent_start != 0) { |
748 | found_extent = 1; | |
749 | inode->i_blocks -= num_dec; | |
750 | } | |
d8d5f3e1 CM |
751 | root_gen = btrfs_header_generation(leaf); |
752 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 753 | } |
179e29e4 CM |
754 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
755 | !del_item) { | |
756 | u32 newsize = inode->i_size - found_key.offset; | |
757 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
758 | ret = btrfs_truncate_item(trans, root, path, | |
759 | newsize, 1); | |
760 | BUG_ON(ret); | |
39279cc3 | 761 | } |
179e29e4 | 762 | delete: |
39279cc3 CM |
763 | if (del_item) { |
764 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
765 | if (ret) |
766 | goto error; | |
39279cc3 CM |
767 | } else { |
768 | break; | |
769 | } | |
770 | btrfs_release_path(root, path); | |
771 | if (found_extent) { | |
772 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 773 | extent_num_bytes, |
d8d5f3e1 | 774 | root_owner, |
7bb86316 CM |
775 | root_gen, inode->i_ino, |
776 | found_key.offset, 0); | |
39279cc3 CM |
777 | BUG_ON(ret); |
778 | } | |
779 | } | |
780 | ret = 0; | |
781 | error: | |
782 | btrfs_release_path(root, path); | |
783 | btrfs_free_path(path); | |
784 | inode->i_sb->s_dirt = 1; | |
785 | return ret; | |
786 | } | |
787 | ||
b888db2b | 788 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
789 | size_t zero_start) |
790 | { | |
791 | char *kaddr; | |
792 | int ret = 0; | |
b888db2b | 793 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
35ebb934 | 794 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 795 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 | 796 | |
b3cfa35a | 797 | set_page_extent_mapped(page); |
a52d9a80 | 798 | |
b888db2b CM |
799 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
800 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
801 | page_end, GFP_NOFS); | |
a52d9a80 | 802 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 803 | kaddr = kmap(page); |
a52d9a80 CM |
804 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
805 | flush_dcache_page(page); | |
b888db2b | 806 | kunmap(page); |
a52d9a80 | 807 | } |
b888db2b CM |
808 | set_page_dirty(page); |
809 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 810 | |
a52d9a80 CM |
811 | return ret; |
812 | } | |
813 | ||
39279cc3 CM |
814 | /* |
815 | * taken from block_truncate_page, but does cow as it zeros out | |
816 | * any bytes left in the last page in the file. | |
817 | */ | |
818 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
819 | { | |
820 | struct inode *inode = mapping->host; | |
db94535d CM |
821 | struct btrfs_root *root = BTRFS_I(inode)->root; |
822 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
823 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
824 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
825 | struct page *page; | |
39279cc3 | 826 | int ret = 0; |
a52d9a80 | 827 | u64 page_start; |
39279cc3 CM |
828 | |
829 | if ((offset & (blocksize - 1)) == 0) | |
830 | goto out; | |
831 | ||
db94535d | 832 | down_read(&root->snap_sem); |
39279cc3 CM |
833 | ret = -ENOMEM; |
834 | page = grab_cache_page(mapping, index); | |
835 | if (!page) | |
836 | goto out; | |
39279cc3 | 837 | if (!PageUptodate(page)) { |
9ebefb18 | 838 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
839 | lock_page(page); |
840 | if (!PageUptodate(page)) { | |
841 | ret = -EIO; | |
842 | goto out; | |
843 | } | |
844 | } | |
35ebb934 | 845 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 846 | |
b888db2b | 847 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 848 | |
39279cc3 CM |
849 | unlock_page(page); |
850 | page_cache_release(page); | |
011410bd | 851 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
852 | out: |
853 | return ret; | |
854 | } | |
855 | ||
856 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
857 | { | |
858 | struct inode *inode = dentry->d_inode; | |
859 | int err; | |
860 | ||
861 | err = inode_change_ok(inode, attr); | |
862 | if (err) | |
863 | return err; | |
864 | ||
865 | if (S_ISREG(inode->i_mode) && | |
866 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
867 | struct btrfs_trans_handle *trans; | |
868 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
869 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
870 | ||
5f39d397 | 871 | u64 mask = root->sectorsize - 1; |
39279cc3 | 872 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 873 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 874 | u64 hole_size; |
179e29e4 | 875 | u64 alloc_hint = 0; |
39279cc3 CM |
876 | |
877 | if (attr->ia_size <= pos) | |
878 | goto out; | |
879 | ||
880 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
881 | ||
2bf5a725 | 882 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 883 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
884 | |
885 | mutex_lock(&root->fs_info->fs_mutex); | |
886 | trans = btrfs_start_transaction(root, 1); | |
887 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 888 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
889 | pos, pos + hole_size, pos, |
890 | &alloc_hint); | |
2bf5a725 | 891 | |
179e29e4 CM |
892 | if (alloc_hint != EXTENT_MAP_INLINE) { |
893 | err = btrfs_insert_file_extent(trans, root, | |
894 | inode->i_ino, | |
895 | pos, 0, 0, hole_size); | |
896 | } | |
39279cc3 CM |
897 | btrfs_end_transaction(trans, root); |
898 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 899 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
900 | if (err) |
901 | return err; | |
39279cc3 CM |
902 | } |
903 | out: | |
904 | err = inode_setattr(inode, attr); | |
905 | ||
906 | return err; | |
907 | } | |
908 | void btrfs_delete_inode(struct inode *inode) | |
909 | { | |
910 | struct btrfs_trans_handle *trans; | |
911 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 912 | unsigned long nr; |
39279cc3 CM |
913 | int ret; |
914 | ||
915 | truncate_inode_pages(&inode->i_data, 0); | |
916 | if (is_bad_inode(inode)) { | |
917 | goto no_delete; | |
918 | } | |
5f39d397 | 919 | |
39279cc3 CM |
920 | inode->i_size = 0; |
921 | mutex_lock(&root->fs_info->fs_mutex); | |
922 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 923 | |
39279cc3 CM |
924 | btrfs_set_trans_block_group(trans, inode); |
925 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
926 | if (ret) |
927 | goto no_delete_lock; | |
928 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
929 | if (ret) |
930 | goto no_delete_lock; | |
931 | ret = btrfs_free_inode(trans, root, inode); | |
932 | if (ret) | |
933 | goto no_delete_lock; | |
d3c2fdcf | 934 | nr = trans->blocks_used; |
5f39d397 | 935 | |
39279cc3 CM |
936 | btrfs_end_transaction(trans, root); |
937 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 938 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 939 | return; |
54aa1f4d CM |
940 | |
941 | no_delete_lock: | |
d3c2fdcf | 942 | nr = trans->blocks_used; |
54aa1f4d CM |
943 | btrfs_end_transaction(trans, root); |
944 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 945 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
946 | no_delete: |
947 | clear_inode(inode); | |
948 | } | |
949 | ||
950 | /* | |
951 | * this returns the key found in the dir entry in the location pointer. | |
952 | * If no dir entries were found, location->objectid is 0. | |
953 | */ | |
954 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
955 | struct btrfs_key *location) | |
956 | { | |
957 | const char *name = dentry->d_name.name; | |
958 | int namelen = dentry->d_name.len; | |
959 | struct btrfs_dir_item *di; | |
960 | struct btrfs_path *path; | |
961 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 962 | int ret = 0; |
39279cc3 | 963 | |
3954401f CM |
964 | if (namelen == 1 && strcmp(name, ".") == 0) { |
965 | location->objectid = dir->i_ino; | |
966 | location->type = BTRFS_INODE_ITEM_KEY; | |
967 | location->offset = 0; | |
968 | return 0; | |
969 | } | |
39279cc3 CM |
970 | path = btrfs_alloc_path(); |
971 | BUG_ON(!path); | |
3954401f | 972 | |
7a720536 | 973 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
974 | struct btrfs_key key; |
975 | struct extent_buffer *leaf; | |
976 | u32 nritems; | |
977 | int slot; | |
978 | ||
979 | key.objectid = dir->i_ino; | |
980 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
981 | key.offset = 0; | |
982 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
983 | BUG_ON(ret == 0); | |
984 | ret = 0; | |
985 | ||
986 | leaf = path->nodes[0]; | |
987 | slot = path->slots[0]; | |
988 | nritems = btrfs_header_nritems(leaf); | |
989 | if (slot >= nritems) | |
990 | goto out_err; | |
991 | ||
992 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
993 | if (key.objectid != dir->i_ino || | |
994 | key.type != BTRFS_INODE_REF_KEY) { | |
995 | goto out_err; | |
996 | } | |
997 | location->objectid = key.offset; | |
998 | location->type = BTRFS_INODE_ITEM_KEY; | |
999 | location->offset = 0; | |
1000 | goto out; | |
1001 | } | |
1002 | ||
39279cc3 CM |
1003 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1004 | namelen, 0); | |
0d9f7f3e Y |
1005 | if (IS_ERR(di)) |
1006 | ret = PTR_ERR(di); | |
39279cc3 | 1007 | if (!di || IS_ERR(di)) { |
3954401f | 1008 | goto out_err; |
39279cc3 | 1009 | } |
5f39d397 | 1010 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1011 | out: |
39279cc3 CM |
1012 | btrfs_free_path(path); |
1013 | return ret; | |
3954401f CM |
1014 | out_err: |
1015 | location->objectid = 0; | |
1016 | goto out; | |
39279cc3 CM |
1017 | } |
1018 | ||
1019 | /* | |
1020 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1021 | * needs to be changed to reflect the root directory of the tree root. This | |
1022 | * is kind of like crossing a mount point. | |
1023 | */ | |
1024 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1025 | struct btrfs_key *location, | |
58176a96 JB |
1026 | struct btrfs_root **sub_root, |
1027 | struct dentry *dentry) | |
39279cc3 CM |
1028 | { |
1029 | struct btrfs_path *path; | |
1030 | struct btrfs_root_item *ri; | |
1031 | ||
1032 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1033 | return 0; | |
1034 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1035 | return 0; | |
1036 | ||
1037 | path = btrfs_alloc_path(); | |
1038 | BUG_ON(!path); | |
1039 | mutex_lock(&root->fs_info->fs_mutex); | |
1040 | ||
58176a96 JB |
1041 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1042 | dentry->d_name.name, | |
1043 | dentry->d_name.len); | |
39279cc3 CM |
1044 | if (IS_ERR(*sub_root)) |
1045 | return PTR_ERR(*sub_root); | |
1046 | ||
1047 | ri = &(*sub_root)->root_item; | |
1048 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1049 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1050 | location->offset = 0; | |
1051 | ||
1052 | btrfs_free_path(path); | |
1053 | mutex_unlock(&root->fs_info->fs_mutex); | |
1054 | return 0; | |
1055 | } | |
1056 | ||
1057 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1058 | { | |
1059 | struct btrfs_iget_args *args = p; | |
1060 | inode->i_ino = args->ino; | |
1061 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
1062 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1063 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1064 | return 0; |
1065 | } | |
1066 | ||
1067 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1068 | { | |
1069 | struct btrfs_iget_args *args = opaque; | |
1070 | return (args->ino == inode->i_ino && | |
1071 | args->root == BTRFS_I(inode)->root); | |
1072 | } | |
1073 | ||
1074 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
1075 | struct btrfs_root *root) | |
1076 | { | |
1077 | struct inode *inode; | |
1078 | struct btrfs_iget_args args; | |
1079 | args.ino = objectid; | |
1080 | args.root = root; | |
1081 | ||
1082 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1083 | btrfs_init_locked_inode, | |
1084 | (void *)&args); | |
1085 | return inode; | |
1086 | } | |
1087 | ||
1088 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1089 | struct nameidata *nd) | |
1090 | { | |
1091 | struct inode * inode; | |
1092 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1093 | struct btrfs_root *root = bi->root; | |
1094 | struct btrfs_root *sub_root = root; | |
1095 | struct btrfs_key location; | |
1096 | int ret; | |
1097 | ||
1098 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1099 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1100 | |
39279cc3 CM |
1101 | mutex_lock(&root->fs_info->fs_mutex); |
1102 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1103 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1104 | |
39279cc3 CM |
1105 | if (ret < 0) |
1106 | return ERR_PTR(ret); | |
5f39d397 | 1107 | |
39279cc3 CM |
1108 | inode = NULL; |
1109 | if (location.objectid) { | |
58176a96 JB |
1110 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1111 | dentry); | |
39279cc3 CM |
1112 | if (ret < 0) |
1113 | return ERR_PTR(ret); | |
1114 | if (ret > 0) | |
1115 | return ERR_PTR(-ENOENT); | |
1116 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1117 | sub_root); | |
1118 | if (!inode) | |
1119 | return ERR_PTR(-EACCES); | |
1120 | if (inode->i_state & I_NEW) { | |
1121 | /* the inode and parent dir are two different roots */ | |
1122 | if (sub_root != root) { | |
1123 | igrab(inode); | |
1124 | sub_root->inode = inode; | |
1125 | } | |
1126 | BTRFS_I(inode)->root = sub_root; | |
1127 | memcpy(&BTRFS_I(inode)->location, &location, | |
1128 | sizeof(location)); | |
1129 | btrfs_read_locked_inode(inode); | |
1130 | unlock_new_inode(inode); | |
1131 | } | |
1132 | } | |
1133 | return d_splice_alias(inode, dentry); | |
1134 | } | |
1135 | ||
39279cc3 CM |
1136 | static unsigned char btrfs_filetype_table[] = { |
1137 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1138 | }; | |
1139 | ||
1140 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1141 | { | |
1142 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1143 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1144 | struct btrfs_item *item; | |
1145 | struct btrfs_dir_item *di; | |
1146 | struct btrfs_key key; | |
5f39d397 | 1147 | struct btrfs_key found_key; |
39279cc3 CM |
1148 | struct btrfs_path *path; |
1149 | int ret; | |
1150 | u32 nritems; | |
5f39d397 | 1151 | struct extent_buffer *leaf; |
39279cc3 CM |
1152 | int slot; |
1153 | int advance; | |
1154 | unsigned char d_type; | |
1155 | int over = 0; | |
1156 | u32 di_cur; | |
1157 | u32 di_total; | |
1158 | u32 di_len; | |
1159 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1160 | char tmp_name[32]; |
1161 | char *name_ptr; | |
1162 | int name_len; | |
39279cc3 CM |
1163 | |
1164 | /* FIXME, use a real flag for deciding about the key type */ | |
1165 | if (root->fs_info->tree_root == root) | |
1166 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1167 | |
3954401f CM |
1168 | /* special case for "." */ |
1169 | if (filp->f_pos == 0) { | |
1170 | over = filldir(dirent, ".", 1, | |
1171 | 1, inode->i_ino, | |
1172 | DT_DIR); | |
1173 | if (over) | |
1174 | return 0; | |
1175 | filp->f_pos = 1; | |
1176 | } | |
1177 | ||
39279cc3 CM |
1178 | mutex_lock(&root->fs_info->fs_mutex); |
1179 | key.objectid = inode->i_ino; | |
3954401f CM |
1180 | path = btrfs_alloc_path(); |
1181 | path->reada = 2; | |
1182 | ||
1183 | /* special case for .., just use the back ref */ | |
1184 | if (filp->f_pos == 1) { | |
1185 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1186 | key.offset = 0; | |
1187 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1188 | BUG_ON(ret == 0); | |
1189 | leaf = path->nodes[0]; | |
1190 | slot = path->slots[0]; | |
1191 | nritems = btrfs_header_nritems(leaf); | |
1192 | if (slot >= nritems) { | |
1193 | btrfs_release_path(root, path); | |
1194 | goto read_dir_items; | |
1195 | } | |
1196 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1197 | btrfs_release_path(root, path); | |
1198 | if (found_key.objectid != key.objectid || | |
1199 | found_key.type != BTRFS_INODE_REF_KEY) | |
1200 | goto read_dir_items; | |
1201 | over = filldir(dirent, "..", 2, | |
1202 | 2, found_key.offset, DT_DIR); | |
1203 | if (over) | |
1204 | goto nopos; | |
1205 | filp->f_pos = 2; | |
1206 | } | |
1207 | ||
1208 | read_dir_items: | |
39279cc3 CM |
1209 | btrfs_set_key_type(&key, key_type); |
1210 | key.offset = filp->f_pos; | |
5f39d397 | 1211 | |
39279cc3 CM |
1212 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1213 | if (ret < 0) | |
1214 | goto err; | |
1215 | advance = 0; | |
39279cc3 | 1216 | while(1) { |
5f39d397 CM |
1217 | leaf = path->nodes[0]; |
1218 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1219 | slot = path->slots[0]; |
1220 | if (advance || slot >= nritems) { | |
1221 | if (slot >= nritems -1) { | |
39279cc3 CM |
1222 | ret = btrfs_next_leaf(root, path); |
1223 | if (ret) | |
1224 | break; | |
5f39d397 CM |
1225 | leaf = path->nodes[0]; |
1226 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1227 | slot = path->slots[0]; |
1228 | } else { | |
1229 | slot++; | |
1230 | path->slots[0]++; | |
1231 | } | |
1232 | } | |
1233 | advance = 1; | |
5f39d397 CM |
1234 | item = btrfs_item_nr(leaf, slot); |
1235 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1236 | ||
1237 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1238 | break; |
5f39d397 | 1239 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1240 | break; |
5f39d397 | 1241 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1242 | continue; |
5f39d397 CM |
1243 | |
1244 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1245 | advance = 1; |
1246 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1247 | di_cur = 0; | |
5f39d397 | 1248 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1249 | while(di_cur < di_total) { |
5f39d397 CM |
1250 | struct btrfs_key location; |
1251 | ||
1252 | name_len = btrfs_dir_name_len(leaf, di); | |
1253 | if (name_len < 32) { | |
1254 | name_ptr = tmp_name; | |
1255 | } else { | |
1256 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1257 | BUG_ON(!name_ptr); | |
1258 | } | |
1259 | read_extent_buffer(leaf, name_ptr, | |
1260 | (unsigned long)(di + 1), name_len); | |
1261 | ||
1262 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1263 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1264 | ||
1265 | over = filldir(dirent, name_ptr, name_len, | |
1266 | found_key.offset, | |
1267 | location.objectid, | |
39279cc3 | 1268 | d_type); |
5f39d397 CM |
1269 | |
1270 | if (name_ptr != tmp_name) | |
1271 | kfree(name_ptr); | |
1272 | ||
39279cc3 CM |
1273 | if (over) |
1274 | goto nopos; | |
5103e947 JB |
1275 | di_len = btrfs_dir_name_len(leaf, di) + |
1276 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1277 | di_cur += di_len; |
1278 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1279 | } | |
1280 | } | |
1281 | filp->f_pos++; | |
1282 | nopos: | |
1283 | ret = 0; | |
1284 | err: | |
1285 | btrfs_release_path(root, path); | |
1286 | btrfs_free_path(path); | |
1287 | mutex_unlock(&root->fs_info->fs_mutex); | |
1288 | return ret; | |
1289 | } | |
1290 | ||
1291 | int btrfs_write_inode(struct inode *inode, int wait) | |
1292 | { | |
1293 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1294 | struct btrfs_trans_handle *trans; | |
1295 | int ret = 0; | |
1296 | ||
1297 | if (wait) { | |
1298 | mutex_lock(&root->fs_info->fs_mutex); | |
1299 | trans = btrfs_start_transaction(root, 1); | |
1300 | btrfs_set_trans_block_group(trans, inode); | |
1301 | ret = btrfs_commit_transaction(trans, root); | |
1302 | mutex_unlock(&root->fs_info->fs_mutex); | |
1303 | } | |
1304 | return ret; | |
1305 | } | |
1306 | ||
1307 | /* | |
54aa1f4d | 1308 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1309 | * inode changes. But, it is most likely to find the inode in cache. |
1310 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1311 | * to keep or drop this code. | |
1312 | */ | |
1313 | void btrfs_dirty_inode(struct inode *inode) | |
1314 | { | |
1315 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1316 | struct btrfs_trans_handle *trans; | |
1317 | ||
1318 | mutex_lock(&root->fs_info->fs_mutex); | |
1319 | trans = btrfs_start_transaction(root, 1); | |
1320 | btrfs_set_trans_block_group(trans, inode); | |
1321 | btrfs_update_inode(trans, root, inode); | |
1322 | btrfs_end_transaction(trans, root); | |
1323 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1324 | } |
1325 | ||
1326 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1327 | struct btrfs_root *root, | |
1328 | u64 objectid, | |
1329 | struct btrfs_block_group_cache *group, | |
1330 | int mode) | |
1331 | { | |
1332 | struct inode *inode; | |
5f39d397 | 1333 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1334 | struct btrfs_key *location; |
5f39d397 | 1335 | struct btrfs_path *path; |
39279cc3 CM |
1336 | int ret; |
1337 | int owner; | |
1338 | ||
5f39d397 CM |
1339 | path = btrfs_alloc_path(); |
1340 | BUG_ON(!path); | |
1341 | ||
39279cc3 CM |
1342 | inode = new_inode(root->fs_info->sb); |
1343 | if (!inode) | |
1344 | return ERR_PTR(-ENOMEM); | |
1345 | ||
b888db2b CM |
1346 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1347 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1348 | BTRFS_I(inode)->root = root; |
b888db2b | 1349 | |
39279cc3 CM |
1350 | if (mode & S_IFDIR) |
1351 | owner = 0; | |
1352 | else | |
1353 | owner = 1; | |
1354 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1355 | BTRFS_I(inode)->block_group = group; | |
1356 | ||
5f39d397 CM |
1357 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1358 | if (ret) | |
1359 | goto fail; | |
1360 | ||
39279cc3 CM |
1361 | inode->i_uid = current->fsuid; |
1362 | inode->i_gid = current->fsgid; | |
1363 | inode->i_mode = mode; | |
1364 | inode->i_ino = objectid; | |
1365 | inode->i_blocks = 0; | |
1366 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1367 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1368 | struct btrfs_inode_item); | |
1369 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1370 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1371 | btrfs_free_path(path); | |
1372 | ||
39279cc3 CM |
1373 | location = &BTRFS_I(inode)->location; |
1374 | location->objectid = objectid; | |
39279cc3 CM |
1375 | location->offset = 0; |
1376 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1377 | ||
39279cc3 CM |
1378 | insert_inode_hash(inode); |
1379 | return inode; | |
5f39d397 CM |
1380 | fail: |
1381 | btrfs_free_path(path); | |
1382 | return ERR_PTR(ret); | |
39279cc3 CM |
1383 | } |
1384 | ||
1385 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1386 | { | |
1387 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1388 | } | |
1389 | ||
1390 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1391 | struct dentry *dentry, struct inode *inode) | |
1392 | { | |
1393 | int ret; | |
1394 | struct btrfs_key key; | |
1395 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1396 | struct inode *parent_inode; |
5f39d397 | 1397 | |
39279cc3 | 1398 | key.objectid = inode->i_ino; |
39279cc3 CM |
1399 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1400 | key.offset = 0; | |
1401 | ||
1402 | ret = btrfs_insert_dir_item(trans, root, | |
1403 | dentry->d_name.name, dentry->d_name.len, | |
1404 | dentry->d_parent->d_inode->i_ino, | |
1405 | &key, btrfs_inode_type(inode)); | |
1406 | if (ret == 0) { | |
76fea00a CM |
1407 | ret = btrfs_insert_inode_ref(trans, root, |
1408 | dentry->d_name.name, | |
1409 | dentry->d_name.len, | |
1410 | inode->i_ino, | |
1411 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1412 | parent_inode = dentry->d_parent->d_inode; |
1413 | parent_inode->i_size += dentry->d_name.len * 2; | |
1414 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1415 | ret = btrfs_update_inode(trans, root, |
1416 | dentry->d_parent->d_inode); | |
1417 | } | |
1418 | return ret; | |
1419 | } | |
1420 | ||
1421 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1422 | struct dentry *dentry, struct inode *inode) | |
1423 | { | |
1424 | int err = btrfs_add_link(trans, dentry, inode); | |
1425 | if (!err) { | |
1426 | d_instantiate(dentry, inode); | |
1427 | return 0; | |
1428 | } | |
1429 | if (err > 0) | |
1430 | err = -EEXIST; | |
1431 | return err; | |
1432 | } | |
1433 | ||
618e21d5 JB |
1434 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1435 | int mode, dev_t rdev) | |
1436 | { | |
1437 | struct btrfs_trans_handle *trans; | |
1438 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1439 | struct inode *inode; | |
1440 | int err; | |
1441 | int drop_inode = 0; | |
1442 | u64 objectid; | |
d3c2fdcf | 1443 | unsigned long nr; |
618e21d5 JB |
1444 | |
1445 | if (!new_valid_dev(rdev)) | |
1446 | return -EINVAL; | |
1447 | ||
1448 | mutex_lock(&root->fs_info->fs_mutex); | |
1449 | trans = btrfs_start_transaction(root, 1); | |
1450 | btrfs_set_trans_block_group(trans, dir); | |
1451 | ||
1452 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1453 | if (err) { | |
1454 | err = -ENOSPC; | |
1455 | goto out_unlock; | |
1456 | } | |
1457 | ||
1458 | inode = btrfs_new_inode(trans, root, objectid, | |
1459 | BTRFS_I(dir)->block_group, mode); | |
1460 | err = PTR_ERR(inode); | |
1461 | if (IS_ERR(inode)) | |
1462 | goto out_unlock; | |
1463 | ||
1464 | btrfs_set_trans_block_group(trans, inode); | |
1465 | err = btrfs_add_nondir(trans, dentry, inode); | |
1466 | if (err) | |
1467 | drop_inode = 1; | |
1468 | else { | |
1469 | inode->i_op = &btrfs_special_inode_operations; | |
1470 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1471 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1472 | } |
1473 | dir->i_sb->s_dirt = 1; | |
1474 | btrfs_update_inode_block_group(trans, inode); | |
1475 | btrfs_update_inode_block_group(trans, dir); | |
1476 | out_unlock: | |
d3c2fdcf | 1477 | nr = trans->blocks_used; |
618e21d5 JB |
1478 | btrfs_end_transaction(trans, root); |
1479 | mutex_unlock(&root->fs_info->fs_mutex); | |
1480 | ||
1481 | if (drop_inode) { | |
1482 | inode_dec_link_count(inode); | |
1483 | iput(inode); | |
1484 | } | |
d3c2fdcf | 1485 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1486 | return err; |
1487 | } | |
1488 | ||
39279cc3 CM |
1489 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1490 | int mode, struct nameidata *nd) | |
1491 | { | |
1492 | struct btrfs_trans_handle *trans; | |
1493 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1494 | struct inode *inode; | |
1495 | int err; | |
1496 | int drop_inode = 0; | |
d3c2fdcf | 1497 | unsigned long nr; |
39279cc3 CM |
1498 | u64 objectid; |
1499 | ||
1500 | mutex_lock(&root->fs_info->fs_mutex); | |
1501 | trans = btrfs_start_transaction(root, 1); | |
1502 | btrfs_set_trans_block_group(trans, dir); | |
1503 | ||
1504 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1505 | if (err) { | |
1506 | err = -ENOSPC; | |
1507 | goto out_unlock; | |
1508 | } | |
1509 | ||
1510 | inode = btrfs_new_inode(trans, root, objectid, | |
1511 | BTRFS_I(dir)->block_group, mode); | |
1512 | err = PTR_ERR(inode); | |
1513 | if (IS_ERR(inode)) | |
1514 | goto out_unlock; | |
1515 | ||
1516 | btrfs_set_trans_block_group(trans, inode); | |
1517 | err = btrfs_add_nondir(trans, dentry, inode); | |
1518 | if (err) | |
1519 | drop_inode = 1; | |
1520 | else { | |
1521 | inode->i_mapping->a_ops = &btrfs_aops; | |
1522 | inode->i_fop = &btrfs_file_operations; | |
1523 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1524 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1525 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1526 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1527 | } |
1528 | dir->i_sb->s_dirt = 1; | |
1529 | btrfs_update_inode_block_group(trans, inode); | |
1530 | btrfs_update_inode_block_group(trans, dir); | |
1531 | out_unlock: | |
d3c2fdcf | 1532 | nr = trans->blocks_used; |
39279cc3 CM |
1533 | btrfs_end_transaction(trans, root); |
1534 | mutex_unlock(&root->fs_info->fs_mutex); | |
1535 | ||
1536 | if (drop_inode) { | |
1537 | inode_dec_link_count(inode); | |
1538 | iput(inode); | |
1539 | } | |
d3c2fdcf | 1540 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1541 | return err; |
1542 | } | |
1543 | ||
1544 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1545 | struct dentry *dentry) | |
1546 | { | |
1547 | struct btrfs_trans_handle *trans; | |
1548 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1549 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1550 | unsigned long nr; |
39279cc3 CM |
1551 | int err; |
1552 | int drop_inode = 0; | |
1553 | ||
1554 | if (inode->i_nlink == 0) | |
1555 | return -ENOENT; | |
1556 | ||
1557 | inc_nlink(inode); | |
1558 | mutex_lock(&root->fs_info->fs_mutex); | |
1559 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1560 | |
39279cc3 CM |
1561 | btrfs_set_trans_block_group(trans, dir); |
1562 | atomic_inc(&inode->i_count); | |
1563 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1564 | |
39279cc3 CM |
1565 | if (err) |
1566 | drop_inode = 1; | |
5f39d397 | 1567 | |
39279cc3 CM |
1568 | dir->i_sb->s_dirt = 1; |
1569 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1570 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1571 | |
54aa1f4d CM |
1572 | if (err) |
1573 | drop_inode = 1; | |
39279cc3 | 1574 | |
d3c2fdcf | 1575 | nr = trans->blocks_used; |
39279cc3 CM |
1576 | btrfs_end_transaction(trans, root); |
1577 | mutex_unlock(&root->fs_info->fs_mutex); | |
1578 | ||
1579 | if (drop_inode) { | |
1580 | inode_dec_link_count(inode); | |
1581 | iput(inode); | |
1582 | } | |
d3c2fdcf | 1583 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1584 | return err; |
1585 | } | |
1586 | ||
39279cc3 CM |
1587 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1588 | { | |
1589 | struct inode *inode; | |
1590 | struct btrfs_trans_handle *trans; | |
1591 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1592 | int err = 0; | |
1593 | int drop_on_err = 0; | |
1594 | u64 objectid; | |
d3c2fdcf | 1595 | unsigned long nr = 1; |
39279cc3 CM |
1596 | |
1597 | mutex_lock(&root->fs_info->fs_mutex); | |
1598 | trans = btrfs_start_transaction(root, 1); | |
1599 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1600 | |
39279cc3 CM |
1601 | if (IS_ERR(trans)) { |
1602 | err = PTR_ERR(trans); | |
1603 | goto out_unlock; | |
1604 | } | |
1605 | ||
1606 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1607 | if (err) { | |
1608 | err = -ENOSPC; | |
1609 | goto out_unlock; | |
1610 | } | |
1611 | ||
1612 | inode = btrfs_new_inode(trans, root, objectid, | |
1613 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1614 | if (IS_ERR(inode)) { | |
1615 | err = PTR_ERR(inode); | |
1616 | goto out_fail; | |
1617 | } | |
5f39d397 | 1618 | |
39279cc3 CM |
1619 | drop_on_err = 1; |
1620 | inode->i_op = &btrfs_dir_inode_operations; | |
1621 | inode->i_fop = &btrfs_dir_file_operations; | |
1622 | btrfs_set_trans_block_group(trans, inode); | |
1623 | ||
3954401f | 1624 | inode->i_size = 0; |
39279cc3 CM |
1625 | err = btrfs_update_inode(trans, root, inode); |
1626 | if (err) | |
1627 | goto out_fail; | |
5f39d397 | 1628 | |
39279cc3 CM |
1629 | err = btrfs_add_link(trans, dentry, inode); |
1630 | if (err) | |
1631 | goto out_fail; | |
5f39d397 | 1632 | |
39279cc3 CM |
1633 | d_instantiate(dentry, inode); |
1634 | drop_on_err = 0; | |
1635 | dir->i_sb->s_dirt = 1; | |
1636 | btrfs_update_inode_block_group(trans, inode); | |
1637 | btrfs_update_inode_block_group(trans, dir); | |
1638 | ||
1639 | out_fail: | |
d3c2fdcf | 1640 | nr = trans->blocks_used; |
39279cc3 | 1641 | btrfs_end_transaction(trans, root); |
5f39d397 | 1642 | |
39279cc3 CM |
1643 | out_unlock: |
1644 | mutex_unlock(&root->fs_info->fs_mutex); | |
1645 | if (drop_on_err) | |
1646 | iput(inode); | |
d3c2fdcf | 1647 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1648 | return err; |
1649 | } | |
1650 | ||
a52d9a80 CM |
1651 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1652 | size_t page_offset, u64 start, u64 end, | |
1653 | int create) | |
1654 | { | |
1655 | int ret; | |
1656 | int err = 0; | |
db94535d | 1657 | u64 bytenr; |
a52d9a80 CM |
1658 | u64 extent_start = 0; |
1659 | u64 extent_end = 0; | |
1660 | u64 objectid = inode->i_ino; | |
1661 | u32 found_type; | |
1662 | int failed_insert = 0; | |
1663 | struct btrfs_path *path; | |
1664 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1665 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1666 | struct extent_buffer *leaf; |
1667 | struct btrfs_key found_key; | |
a52d9a80 CM |
1668 | struct extent_map *em = NULL; |
1669 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1670 | struct btrfs_trans_handle *trans = NULL; | |
1671 | ||
1672 | path = btrfs_alloc_path(); | |
1673 | BUG_ON(!path); | |
1674 | mutex_lock(&root->fs_info->fs_mutex); | |
1675 | ||
1676 | again: | |
1677 | em = lookup_extent_mapping(em_tree, start, end); | |
1678 | if (em) { | |
1679 | goto out; | |
1680 | } | |
1681 | if (!em) { | |
1682 | em = alloc_extent_map(GFP_NOFS); | |
1683 | if (!em) { | |
1684 | err = -ENOMEM; | |
1685 | goto out; | |
1686 | } | |
5f39d397 CM |
1687 | em->start = EXTENT_MAP_HOLE; |
1688 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1689 | } |
1690 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1691 | ret = btrfs_lookup_file_extent(trans, root, path, |
1692 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1693 | if (ret < 0) { |
1694 | err = ret; | |
1695 | goto out; | |
1696 | } | |
1697 | ||
1698 | if (ret != 0) { | |
1699 | if (path->slots[0] == 0) | |
1700 | goto not_found; | |
1701 | path->slots[0]--; | |
1702 | } | |
1703 | ||
5f39d397 CM |
1704 | leaf = path->nodes[0]; |
1705 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1706 | struct btrfs_file_extent_item); |
a52d9a80 | 1707 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1708 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1709 | found_type = btrfs_key_type(&found_key); | |
1710 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1711 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1712 | goto not_found; | |
1713 | } | |
1714 | ||
5f39d397 CM |
1715 | found_type = btrfs_file_extent_type(leaf, item); |
1716 | extent_start = found_key.offset; | |
a52d9a80 CM |
1717 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1718 | extent_end = extent_start + | |
db94535d | 1719 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1720 | err = 0; |
b888db2b | 1721 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1722 | em->start = start; |
1723 | if (start < extent_start) { | |
b888db2b CM |
1724 | if (end < extent_start) |
1725 | goto not_found; | |
a52d9a80 CM |
1726 | em->end = extent_end - 1; |
1727 | } else { | |
1728 | em->end = end; | |
1729 | } | |
1730 | goto not_found_em; | |
1731 | } | |
db94535d CM |
1732 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1733 | if (bytenr == 0) { | |
a52d9a80 CM |
1734 | em->start = extent_start; |
1735 | em->end = extent_end - 1; | |
5f39d397 CM |
1736 | em->block_start = EXTENT_MAP_HOLE; |
1737 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1738 | goto insert; |
1739 | } | |
db94535d CM |
1740 | bytenr += btrfs_file_extent_offset(leaf, item); |
1741 | em->block_start = bytenr; | |
a52d9a80 | 1742 | em->block_end = em->block_start + |
db94535d | 1743 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1744 | em->start = extent_start; |
1745 | em->end = extent_end - 1; | |
1746 | goto insert; | |
1747 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1748 | unsigned long ptr; |
a52d9a80 | 1749 | char *map; |
3326d1b0 CM |
1750 | size_t size; |
1751 | size_t extent_offset; | |
1752 | size_t copy_size; | |
a52d9a80 | 1753 | |
5f39d397 CM |
1754 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1755 | path->slots[0])); | |
689f9346 | 1756 | extent_end = (extent_start + size - 1) | |
db94535d | 1757 | ((u64)root->sectorsize - 1); |
b888db2b | 1758 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1759 | em->start = start; |
1760 | if (start < extent_start) { | |
b888db2b CM |
1761 | if (end < extent_start) |
1762 | goto not_found; | |
50b78c24 | 1763 | em->end = extent_end; |
a52d9a80 CM |
1764 | } else { |
1765 | em->end = end; | |
1766 | } | |
1767 | goto not_found_em; | |
1768 | } | |
689f9346 Y |
1769 | em->block_start = EXTENT_MAP_INLINE; |
1770 | em->block_end = EXTENT_MAP_INLINE; | |
1771 | ||
1772 | if (!page) { | |
1773 | em->start = extent_start; | |
1774 | em->end = extent_start + size - 1; | |
1775 | goto out; | |
1776 | } | |
5f39d397 | 1777 | |
35ebb934 | 1778 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1779 | extent_start + page_offset; |
ae2f5411 | 1780 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1781 | size - extent_offset); |
3326d1b0 CM |
1782 | em->start = extent_start + extent_offset; |
1783 | em->end = (em->start + copy_size -1) | | |
1784 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1785 | map = kmap(page); |
1786 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1787 | if (create == 0 && !PageUptodate(page)) { |
1788 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1789 | copy_size); | |
1790 | flush_dcache_page(page); | |
1791 | } else if (create && PageUptodate(page)) { | |
1792 | if (!trans) { | |
1793 | kunmap(page); | |
1794 | free_extent_map(em); | |
1795 | em = NULL; | |
1796 | btrfs_release_path(root, path); | |
1797 | trans = btrfs_start_transaction(root, 1); | |
1798 | goto again; | |
1799 | } | |
1800 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1801 | copy_size); | |
1802 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1803 | } |
a52d9a80 | 1804 | kunmap(page); |
3326d1b0 | 1805 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1806 | goto insert; |
1807 | } else { | |
1808 | printk("unkknown found_type %d\n", found_type); | |
1809 | WARN_ON(1); | |
1810 | } | |
1811 | not_found: | |
1812 | em->start = start; | |
1813 | em->end = end; | |
1814 | not_found_em: | |
5f39d397 CM |
1815 | em->block_start = EXTENT_MAP_HOLE; |
1816 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1817 | insert: |
1818 | btrfs_release_path(root, path); | |
1819 | if (em->start > start || em->end < start) { | |
b888db2b | 1820 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1821 | err = -EIO; |
1822 | goto out; | |
1823 | } | |
1824 | ret = add_extent_mapping(em_tree, em); | |
1825 | if (ret == -EEXIST) { | |
1826 | free_extent_map(em); | |
2bf5a725 | 1827 | em = NULL; |
a52d9a80 CM |
1828 | failed_insert++; |
1829 | if (failed_insert > 5) { | |
1830 | printk("failing to insert %Lu %Lu\n", start, end); | |
1831 | err = -EIO; | |
1832 | goto out; | |
1833 | } | |
a52d9a80 CM |
1834 | goto again; |
1835 | } | |
1836 | err = 0; | |
1837 | out: | |
1838 | btrfs_free_path(path); | |
1839 | if (trans) { | |
1840 | ret = btrfs_end_transaction(trans, root); | |
1841 | if (!err) | |
1842 | err = ret; | |
1843 | } | |
1844 | mutex_unlock(&root->fs_info->fs_mutex); | |
1845 | if (err) { | |
1846 | free_extent_map(em); | |
1847 | WARN_ON(1); | |
1848 | return ERR_PTR(err); | |
1849 | } | |
1850 | return em; | |
1851 | } | |
1852 | ||
d396c6f5 | 1853 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1854 | { |
d396c6f5 | 1855 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1856 | } |
1857 | ||
1858 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1859 | unsigned from, unsigned to) | |
1860 | { | |
a52d9a80 CM |
1861 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1862 | page->mapping->host, page, from, to, | |
1863 | btrfs_get_extent); | |
39279cc3 CM |
1864 | } |
1865 | ||
a52d9a80 | 1866 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1867 | { |
a52d9a80 CM |
1868 | struct extent_map_tree *tree; |
1869 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1870 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1871 | } |
a52d9a80 | 1872 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1873 | { |
a52d9a80 | 1874 | struct extent_map_tree *tree; |
b888db2b CM |
1875 | |
1876 | ||
1877 | if (current->flags & PF_MEMALLOC) { | |
1878 | redirty_page_for_writepage(wbc, page); | |
1879 | unlock_page(page); | |
1880 | return 0; | |
1881 | } | |
a52d9a80 CM |
1882 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1883 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1884 | } |
1885 | ||
b293f02e CM |
1886 | static int btrfs_writepages(struct address_space *mapping, |
1887 | struct writeback_control *wbc) | |
1888 | { | |
1889 | struct extent_map_tree *tree; | |
1890 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1891 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
1892 | } | |
1893 | ||
3ab2fb5a CM |
1894 | static int |
1895 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
1896 | struct list_head *pages, unsigned nr_pages) | |
1897 | { | |
1898 | struct extent_map_tree *tree; | |
1899 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1900 | return extent_readpages(tree, mapping, pages, nr_pages, | |
1901 | btrfs_get_extent); | |
1902 | } | |
1903 | ||
a52d9a80 | 1904 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1905 | { |
a52d9a80 CM |
1906 | struct extent_map_tree *tree; |
1907 | int ret; | |
8c2383c3 | 1908 | |
a52d9a80 CM |
1909 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1910 | ret = try_release_extent_mapping(tree, page); | |
1911 | if (ret == 1) { | |
1912 | ClearPagePrivate(page); | |
1913 | set_page_private(page, 0); | |
1914 | page_cache_release(page); | |
39279cc3 | 1915 | } |
a52d9a80 | 1916 | return ret; |
39279cc3 CM |
1917 | } |
1918 | ||
a52d9a80 | 1919 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1920 | { |
a52d9a80 | 1921 | struct extent_map_tree *tree; |
39279cc3 | 1922 | |
a52d9a80 CM |
1923 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1924 | extent_invalidatepage(tree, page, offset); | |
1925 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1926 | } |
1927 | ||
9ebefb18 CM |
1928 | /* |
1929 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1930 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1931 | * be careful to check for EOF conditions here. We set the page up correctly | |
1932 | * for a written page which means we get ENOSPC checking when writing into | |
1933 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1934 | * support these features. | |
1935 | * | |
1936 | * We are not allowed to take the i_mutex here so we have to play games to | |
1937 | * protect against truncate races as the page could now be beyond EOF. Because | |
1938 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1939 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1940 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1941 | * unlock the page. | |
1942 | */ | |
1943 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1944 | { | |
1945 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1946 | unsigned long end; | |
1947 | loff_t size; | |
1948 | int ret = -EINVAL; | |
a52d9a80 | 1949 | u64 page_start; |
9ebefb18 | 1950 | |
011410bd | 1951 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1952 | lock_page(page); |
1953 | wait_on_page_writeback(page); | |
9ebefb18 | 1954 | size = i_size_read(inode); |
35ebb934 | 1955 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 1956 | |
9ebefb18 | 1957 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1958 | (page_start > size)) { |
9ebefb18 CM |
1959 | /* page got truncated out from underneath us */ |
1960 | goto out_unlock; | |
1961 | } | |
1962 | ||
1963 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1964 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1965 | end = size & ~PAGE_CACHE_MASK; |
1966 | else | |
1967 | end = PAGE_CACHE_SIZE; | |
1968 | ||
b888db2b | 1969 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1970 | |
1971 | out_unlock: | |
011410bd | 1972 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1973 | unlock_page(page); |
1974 | return ret; | |
1975 | } | |
1976 | ||
39279cc3 CM |
1977 | static void btrfs_truncate(struct inode *inode) |
1978 | { | |
1979 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1980 | int ret; | |
1981 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1982 | unsigned long nr; |
39279cc3 CM |
1983 | |
1984 | if (!S_ISREG(inode->i_mode)) | |
1985 | return; | |
1986 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1987 | return; | |
1988 | ||
1989 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1990 | ||
1991 | mutex_lock(&root->fs_info->fs_mutex); | |
1992 | trans = btrfs_start_transaction(root, 1); | |
1993 | btrfs_set_trans_block_group(trans, inode); | |
1994 | ||
1995 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1996 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 1997 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 1998 | nr = trans->blocks_used; |
5f39d397 | 1999 | |
39279cc3 CM |
2000 | ret = btrfs_end_transaction(trans, root); |
2001 | BUG_ON(ret); | |
2002 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2003 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2004 | } |
2005 | ||
2006 | int btrfs_commit_write(struct file *file, struct page *page, | |
2007 | unsigned from, unsigned to) | |
2008 | { | |
e9906a98 CM |
2009 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
2010 | struct inode *inode = page->mapping->host; | |
2011 | ||
2012 | btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE); | |
2013 | ||
e9906a98 CM |
2014 | if (pos > inode->i_size) { |
2015 | i_size_write(inode, pos); | |
2016 | mark_inode_dirty(inode); | |
2017 | } | |
2018 | return 0; | |
39279cc3 CM |
2019 | } |
2020 | ||
2021 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
2022 | { | |
2023 | struct btrfs_trans_handle *trans; | |
2024 | struct btrfs_key key; | |
2025 | struct btrfs_root_item root_item; | |
2026 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2027 | struct extent_buffer *leaf; |
39279cc3 CM |
2028 | struct btrfs_root *new_root; |
2029 | struct inode *inode; | |
2030 | struct inode *dir; | |
2031 | int ret; | |
54aa1f4d | 2032 | int err; |
39279cc3 CM |
2033 | u64 objectid; |
2034 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2035 | unsigned long nr = 1; |
39279cc3 CM |
2036 | |
2037 | mutex_lock(&root->fs_info->fs_mutex); | |
2038 | trans = btrfs_start_transaction(root, 1); | |
2039 | BUG_ON(!trans); | |
2040 | ||
7bb86316 CM |
2041 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2042 | 0, &objectid); | |
2043 | if (ret) | |
2044 | goto fail; | |
2045 | ||
2046 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2047 | objectid, trans->transid, 0, 0, | |
2048 | 0, 0); | |
5f39d397 CM |
2049 | if (IS_ERR(leaf)) |
2050 | return PTR_ERR(leaf); | |
2051 | ||
2052 | btrfs_set_header_nritems(leaf, 0); | |
2053 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2054 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2055 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2056 | btrfs_set_header_owner(leaf, objectid); |
2057 | ||
5f39d397 CM |
2058 | write_extent_buffer(leaf, root->fs_info->fsid, |
2059 | (unsigned long)btrfs_header_fsid(leaf), | |
2060 | BTRFS_FSID_SIZE); | |
2061 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2062 | |
2063 | inode_item = &root_item.inode; | |
2064 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2065 | inode_item->generation = cpu_to_le64(1); |
2066 | inode_item->size = cpu_to_le64(3); | |
2067 | inode_item->nlink = cpu_to_le32(1); | |
2068 | inode_item->nblocks = cpu_to_le64(1); | |
2069 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2070 | |
db94535d CM |
2071 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2072 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2073 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2074 | btrfs_set_root_used(&root_item, 0); |
2075 | ||
5eda7b5e CM |
2076 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2077 | root_item.drop_level = 0; | |
5f39d397 CM |
2078 | |
2079 | free_extent_buffer(leaf); | |
2080 | leaf = NULL; | |
39279cc3 | 2081 | |
39279cc3 CM |
2082 | btrfs_set_root_dirid(&root_item, new_dirid); |
2083 | ||
2084 | key.objectid = objectid; | |
2085 | key.offset = 1; | |
39279cc3 CM |
2086 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2087 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2088 | &root_item); | |
54aa1f4d CM |
2089 | if (ret) |
2090 | goto fail; | |
39279cc3 CM |
2091 | |
2092 | /* | |
2093 | * insert the directory item | |
2094 | */ | |
2095 | key.offset = (u64)-1; | |
2096 | dir = root->fs_info->sb->s_root->d_inode; | |
2097 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2098 | name, namelen, dir->i_ino, &key, | |
2099 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2100 | if (ret) |
2101 | goto fail; | |
39279cc3 | 2102 | |
3954401f CM |
2103 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2104 | name, namelen, objectid, | |
2105 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2106 | if (ret) | |
2107 | goto fail; | |
2108 | ||
39279cc3 | 2109 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2110 | if (ret) |
2111 | goto fail_commit; | |
39279cc3 | 2112 | |
58176a96 | 2113 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2114 | BUG_ON(!new_root); |
2115 | ||
2116 | trans = btrfs_start_transaction(new_root, 1); | |
2117 | BUG_ON(!trans); | |
2118 | ||
2119 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2120 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2121 | if (IS_ERR(inode)) |
2122 | goto fail; | |
39279cc3 CM |
2123 | inode->i_op = &btrfs_dir_inode_operations; |
2124 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2125 | new_root->inode = inode; |
39279cc3 | 2126 | |
3954401f CM |
2127 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2128 | new_dirid); | |
39279cc3 | 2129 | inode->i_nlink = 1; |
3954401f | 2130 | inode->i_size = 0; |
39279cc3 | 2131 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2132 | if (ret) |
2133 | goto fail; | |
2134 | fail: | |
d3c2fdcf | 2135 | nr = trans->blocks_used; |
54aa1f4d CM |
2136 | err = btrfs_commit_transaction(trans, root); |
2137 | if (err && !ret) | |
2138 | ret = err; | |
2139 | fail_commit: | |
39279cc3 | 2140 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2141 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2142 | return ret; |
39279cc3 CM |
2143 | } |
2144 | ||
2145 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2146 | { | |
2147 | struct btrfs_trans_handle *trans; | |
2148 | struct btrfs_key key; | |
2149 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2150 | struct extent_buffer *tmp; |
39279cc3 | 2151 | int ret; |
54aa1f4d | 2152 | int err; |
39279cc3 | 2153 | u64 objectid; |
d3c2fdcf | 2154 | unsigned long nr; |
39279cc3 CM |
2155 | |
2156 | if (!root->ref_cows) | |
2157 | return -EINVAL; | |
2158 | ||
011410bd CM |
2159 | down_write(&root->snap_sem); |
2160 | freeze_bdev(root->fs_info->sb->s_bdev); | |
2161 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
2162 | ||
39279cc3 CM |
2163 | mutex_lock(&root->fs_info->fs_mutex); |
2164 | trans = btrfs_start_transaction(root, 1); | |
2165 | BUG_ON(!trans); | |
2166 | ||
2167 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2168 | if (ret) |
2169 | goto fail; | |
39279cc3 CM |
2170 | |
2171 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2172 | 0, &objectid); | |
54aa1f4d CM |
2173 | if (ret) |
2174 | goto fail; | |
39279cc3 CM |
2175 | |
2176 | memcpy(&new_root_item, &root->root_item, | |
2177 | sizeof(new_root_item)); | |
2178 | ||
2179 | key.objectid = objectid; | |
2180 | key.offset = 1; | |
39279cc3 | 2181 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
be20aa9d | 2182 | |
9691975d | 2183 | extent_buffer_get(root->node); |
83df7c1d | 2184 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2185 | free_extent_buffer(tmp); |
be20aa9d CM |
2186 | |
2187 | btrfs_copy_root(trans, root, root->node, &tmp, objectid); | |
2188 | ||
2189 | btrfs_set_root_bytenr(&new_root_item, tmp->start); | |
2190 | btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp)); | |
39279cc3 CM |
2191 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2192 | &new_root_item); | |
be20aa9d | 2193 | free_extent_buffer(tmp); |
54aa1f4d CM |
2194 | if (ret) |
2195 | goto fail; | |
39279cc3 CM |
2196 | |
2197 | /* | |
2198 | * insert the directory item | |
2199 | */ | |
2200 | key.offset = (u64)-1; | |
2201 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2202 | name, namelen, | |
2203 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2204 | &key, BTRFS_FT_DIR); | |
2205 | ||
54aa1f4d CM |
2206 | if (ret) |
2207 | goto fail; | |
39279cc3 | 2208 | |
3954401f CM |
2209 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2210 | name, namelen, objectid, | |
2211 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2212 | ||
2213 | if (ret) | |
2214 | goto fail; | |
54aa1f4d | 2215 | fail: |
d3c2fdcf | 2216 | nr = trans->blocks_used; |
54aa1f4d | 2217 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2218 | |
54aa1f4d CM |
2219 | if (err && !ret) |
2220 | ret = err; | |
5f39d397 | 2221 | |
39279cc3 | 2222 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2223 | up_write(&root->snap_sem); |
d3c2fdcf | 2224 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2225 | return ret; |
39279cc3 CM |
2226 | } |
2227 | ||
86479a04 CM |
2228 | static unsigned long force_ra(struct address_space *mapping, |
2229 | struct file_ra_state *ra, struct file *file, | |
2230 | pgoff_t offset, pgoff_t last_index) | |
2231 | { | |
2232 | pgoff_t req_size; | |
2233 | ||
2234 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2235 | req_size = last_index - offset + 1; | |
2236 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2237 | return offset; | |
2238 | #else | |
2239 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2240 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2241 | return offset + req_size; | |
2242 | #endif | |
2243 | } | |
2244 | ||
2245 | int btrfs_defrag_file(struct file *file) { | |
2246 | struct inode *inode = file->f_path.dentry->d_inode; | |
2247 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2248 | struct page *page; | |
2249 | unsigned long last_index; | |
2250 | unsigned long ra_index = 0; | |
2251 | u64 page_start; | |
2252 | u64 page_end; | |
2253 | unsigned long i; | |
2254 | ||
2255 | mutex_lock(&inode->i_mutex); | |
2256 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2257 | for (i = 0; i <= last_index; i++) { | |
2258 | if (i == ra_index) { | |
2259 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2260 | file, ra_index, last_index); | |
2261 | } | |
2262 | page = grab_cache_page(inode->i_mapping, i); | |
2263 | if (!page) | |
2264 | goto out_unlock; | |
2265 | if (!PageUptodate(page)) { | |
2266 | btrfs_readpage(NULL, page); | |
2267 | lock_page(page); | |
2268 | if (!PageUptodate(page)) { | |
2269 | unlock_page(page); | |
2270 | page_cache_release(page); | |
2271 | goto out_unlock; | |
2272 | } | |
2273 | } | |
35ebb934 | 2274 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2275 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2276 | ||
2277 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2278 | set_extent_delalloc(em_tree, page_start, | |
2279 | page_end, GFP_NOFS); | |
2280 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2281 | set_page_dirty(page); | |
2282 | unlock_page(page); | |
2283 | page_cache_release(page); | |
2284 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2285 | } | |
2286 | ||
2287 | out_unlock: | |
2288 | mutex_unlock(&inode->i_mutex); | |
2289 | return 0; | |
2290 | } | |
2291 | ||
d03581f4 | 2292 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2293 | { |
39279cc3 | 2294 | struct btrfs_ioctl_vol_args vol_args; |
39279cc3 | 2295 | struct btrfs_dir_item *di; |
39279cc3 | 2296 | struct btrfs_path *path; |
d03581f4 | 2297 | int namelen; |
39279cc3 CM |
2298 | u64 root_dirid; |
2299 | ||
d03581f4 CH |
2300 | if (copy_from_user(&vol_args, arg, sizeof(vol_args))) |
2301 | return -EFAULT; | |
5f39d397 | 2302 | |
d03581f4 CH |
2303 | namelen = strlen(vol_args.name); |
2304 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2305 | return -EINVAL; | |
2306 | if (strchr(vol_args.name, '/')) | |
2307 | return -EINVAL; | |
2308 | ||
2309 | path = btrfs_alloc_path(); | |
2310 | if (!path) | |
2311 | return -ENOMEM; | |
2312 | ||
2313 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2314 | mutex_lock(&root->fs_info->fs_mutex); | |
2315 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2316 | path, root_dirid, | |
2317 | vol_args.name, namelen, 0); | |
2318 | mutex_unlock(&root->fs_info->fs_mutex); | |
2319 | btrfs_free_path(path); | |
2320 | if (di && !IS_ERR(di)) | |
2321 | return -EEXIST; | |
2322 | if (IS_ERR(di)) | |
2323 | return PTR_ERR(di); | |
2324 | ||
2325 | if (root == root->fs_info->tree_root) | |
2326 | return create_subvol(root, vol_args.name, namelen); | |
2327 | return create_snapshot(root, vol_args.name, namelen); | |
2328 | } | |
2329 | ||
2330 | static int btrfs_ioctl_defrag(struct file *file) | |
2331 | { | |
2332 | struct inode *inode = file->f_path.dentry->d_inode; | |
2333 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2334 | ||
2335 | switch (inode->i_mode & S_IFMT) { | |
2336 | case S_IFDIR: | |
39279cc3 | 2337 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2338 | btrfs_defrag_root(root, 0); |
2339 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2340 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2341 | break; |
d03581f4 CH |
2342 | case S_IFREG: |
2343 | btrfs_defrag_file(file); | |
2344 | break; | |
2345 | } | |
2346 | ||
2347 | return 0; | |
2348 | } | |
6702ed49 | 2349 | |
d03581f4 CH |
2350 | long btrfs_ioctl(struct file *file, unsigned int |
2351 | cmd, unsigned long arg) | |
2352 | { | |
2353 | struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root; | |
2354 | ||
2355 | switch (cmd) { | |
2356 | case BTRFS_IOC_SNAP_CREATE: | |
2357 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2358 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2359 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2360 | } |
d03581f4 CH |
2361 | |
2362 | return -ENOTTY; | |
39279cc3 CM |
2363 | } |
2364 | ||
39279cc3 CM |
2365 | /* |
2366 | * Called inside transaction, so use GFP_NOFS | |
2367 | */ | |
2368 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2369 | { | |
2370 | struct btrfs_inode *ei; | |
2371 | ||
2372 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2373 | if (!ei) | |
2374 | return NULL; | |
15ee9bc7 | 2375 | ei->last_trans = 0; |
39279cc3 CM |
2376 | return &ei->vfs_inode; |
2377 | } | |
2378 | ||
2379 | void btrfs_destroy_inode(struct inode *inode) | |
2380 | { | |
2381 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2382 | WARN_ON(inode->i_data.nrpages); | |
2383 | ||
2384 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2385 | } | |
2386 | ||
44ec0b71 CM |
2387 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2388 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2389 | #else | |
39279cc3 CM |
2390 | static void init_once(void * foo, struct kmem_cache * cachep, |
2391 | unsigned long flags) | |
44ec0b71 | 2392 | #endif |
39279cc3 CM |
2393 | { |
2394 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2395 | ||
2396 | inode_init_once(&ei->vfs_inode); | |
2397 | } | |
2398 | ||
2399 | void btrfs_destroy_cachep(void) | |
2400 | { | |
2401 | if (btrfs_inode_cachep) | |
2402 | kmem_cache_destroy(btrfs_inode_cachep); | |
2403 | if (btrfs_trans_handle_cachep) | |
2404 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2405 | if (btrfs_transaction_cachep) | |
2406 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2407 | if (btrfs_bit_radix_cachep) | |
2408 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2409 | if (btrfs_path_cachep) | |
2410 | kmem_cache_destroy(btrfs_path_cachep); | |
2411 | } | |
2412 | ||
86479a04 | 2413 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2414 | unsigned long extra_flags, |
44ec0b71 CM |
2415 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2416 | void (*ctor)(struct kmem_cache *, void *) | |
2417 | #else | |
92fee66d | 2418 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2419 | unsigned long) |
2420 | #endif | |
2421 | ) | |
92fee66d CM |
2422 | { |
2423 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2424 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2425 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2426 | ,NULL | |
2427 | #endif | |
2428 | ); | |
2429 | } | |
2430 | ||
39279cc3 CM |
2431 | int btrfs_init_cachep(void) |
2432 | { | |
86479a04 | 2433 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2434 | sizeof(struct btrfs_inode), |
2435 | 0, init_once); | |
39279cc3 CM |
2436 | if (!btrfs_inode_cachep) |
2437 | goto fail; | |
86479a04 CM |
2438 | btrfs_trans_handle_cachep = |
2439 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2440 | sizeof(struct btrfs_trans_handle), | |
2441 | 0, NULL); | |
39279cc3 CM |
2442 | if (!btrfs_trans_handle_cachep) |
2443 | goto fail; | |
86479a04 | 2444 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2445 | sizeof(struct btrfs_transaction), |
92fee66d | 2446 | 0, NULL); |
39279cc3 CM |
2447 | if (!btrfs_transaction_cachep) |
2448 | goto fail; | |
86479a04 | 2449 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2450 | sizeof(struct btrfs_path), |
92fee66d | 2451 | 0, NULL); |
39279cc3 CM |
2452 | if (!btrfs_path_cachep) |
2453 | goto fail; | |
86479a04 | 2454 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2455 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2456 | if (!btrfs_bit_radix_cachep) |
2457 | goto fail; | |
2458 | return 0; | |
2459 | fail: | |
2460 | btrfs_destroy_cachep(); | |
2461 | return -ENOMEM; | |
2462 | } | |
2463 | ||
2464 | static int btrfs_getattr(struct vfsmount *mnt, | |
2465 | struct dentry *dentry, struct kstat *stat) | |
2466 | { | |
2467 | struct inode *inode = dentry->d_inode; | |
2468 | generic_fillattr(inode, stat); | |
2469 | stat->blksize = 256 * 1024; | |
2470 | return 0; | |
2471 | } | |
2472 | ||
2473 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2474 | struct inode * new_dir,struct dentry *new_dentry) | |
2475 | { | |
2476 | struct btrfs_trans_handle *trans; | |
2477 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2478 | struct inode *new_inode = new_dentry->d_inode; | |
2479 | struct inode *old_inode = old_dentry->d_inode; | |
2480 | struct timespec ctime = CURRENT_TIME; | |
2481 | struct btrfs_path *path; | |
39279cc3 CM |
2482 | int ret; |
2483 | ||
2484 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2485 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2486 | return -ENOTEMPTY; | |
2487 | } | |
5f39d397 | 2488 | |
39279cc3 CM |
2489 | mutex_lock(&root->fs_info->fs_mutex); |
2490 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 2491 | |
39279cc3 CM |
2492 | btrfs_set_trans_block_group(trans, new_dir); |
2493 | path = btrfs_alloc_path(); | |
2494 | if (!path) { | |
2495 | ret = -ENOMEM; | |
2496 | goto out_fail; | |
2497 | } | |
2498 | ||
2499 | old_dentry->d_inode->i_nlink++; | |
2500 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2501 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2502 | old_inode->i_ctime = ctime; | |
5f39d397 | 2503 | |
39279cc3 CM |
2504 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2505 | if (ret) | |
2506 | goto out_fail; | |
2507 | ||
2508 | if (new_inode) { | |
2509 | new_inode->i_ctime = CURRENT_TIME; | |
2510 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2511 | if (ret) | |
2512 | goto out_fail; | |
39279cc3 CM |
2513 | } |
2514 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2515 | if (ret) | |
2516 | goto out_fail; | |
2517 | ||
2518 | out_fail: | |
2519 | btrfs_free_path(path); | |
2520 | btrfs_end_transaction(trans, root); | |
2521 | mutex_unlock(&root->fs_info->fs_mutex); | |
2522 | return ret; | |
2523 | } | |
2524 | ||
2525 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2526 | const char *symname) | |
2527 | { | |
2528 | struct btrfs_trans_handle *trans; | |
2529 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2530 | struct btrfs_path *path; | |
2531 | struct btrfs_key key; | |
2532 | struct inode *inode; | |
2533 | int err; | |
2534 | int drop_inode = 0; | |
2535 | u64 objectid; | |
2536 | int name_len; | |
2537 | int datasize; | |
5f39d397 | 2538 | unsigned long ptr; |
39279cc3 | 2539 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2540 | struct extent_buffer *leaf; |
d3c2fdcf | 2541 | unsigned long nr; |
39279cc3 CM |
2542 | |
2543 | name_len = strlen(symname) + 1; | |
2544 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2545 | return -ENAMETOOLONG; | |
2546 | mutex_lock(&root->fs_info->fs_mutex); | |
2547 | trans = btrfs_start_transaction(root, 1); | |
2548 | btrfs_set_trans_block_group(trans, dir); | |
2549 | ||
2550 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2551 | if (err) { | |
2552 | err = -ENOSPC; | |
2553 | goto out_unlock; | |
2554 | } | |
2555 | ||
2556 | inode = btrfs_new_inode(trans, root, objectid, | |
2557 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2558 | err = PTR_ERR(inode); | |
2559 | if (IS_ERR(inode)) | |
2560 | goto out_unlock; | |
2561 | ||
2562 | btrfs_set_trans_block_group(trans, inode); | |
2563 | err = btrfs_add_nondir(trans, dentry, inode); | |
2564 | if (err) | |
2565 | drop_inode = 1; | |
2566 | else { | |
2567 | inode->i_mapping->a_ops = &btrfs_aops; | |
2568 | inode->i_fop = &btrfs_file_operations; | |
2569 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2570 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2571 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2572 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2573 | } |
2574 | dir->i_sb->s_dirt = 1; | |
2575 | btrfs_update_inode_block_group(trans, inode); | |
2576 | btrfs_update_inode_block_group(trans, dir); | |
2577 | if (drop_inode) | |
2578 | goto out_unlock; | |
2579 | ||
2580 | path = btrfs_alloc_path(); | |
2581 | BUG_ON(!path); | |
2582 | key.objectid = inode->i_ino; | |
2583 | key.offset = 0; | |
39279cc3 CM |
2584 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2585 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2586 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2587 | datasize); | |
54aa1f4d CM |
2588 | if (err) { |
2589 | drop_inode = 1; | |
2590 | goto out_unlock; | |
2591 | } | |
5f39d397 CM |
2592 | leaf = path->nodes[0]; |
2593 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2594 | struct btrfs_file_extent_item); | |
2595 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2596 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2597 | BTRFS_FILE_EXTENT_INLINE); |
2598 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2599 | write_extent_buffer(leaf, symname, ptr, name_len); |
2600 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2601 | btrfs_free_path(path); |
5f39d397 | 2602 | |
39279cc3 CM |
2603 | inode->i_op = &btrfs_symlink_inode_operations; |
2604 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2605 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2606 | err = btrfs_update_inode(trans, root, inode); |
2607 | if (err) | |
2608 | drop_inode = 1; | |
39279cc3 CM |
2609 | |
2610 | out_unlock: | |
d3c2fdcf | 2611 | nr = trans->blocks_used; |
39279cc3 CM |
2612 | btrfs_end_transaction(trans, root); |
2613 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2614 | if (drop_inode) { |
2615 | inode_dec_link_count(inode); | |
2616 | iput(inode); | |
2617 | } | |
d3c2fdcf | 2618 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2619 | return err; |
2620 | } | |
2621 | ||
2622 | static struct inode_operations btrfs_dir_inode_operations = { | |
2623 | .lookup = btrfs_lookup, | |
2624 | .create = btrfs_create, | |
2625 | .unlink = btrfs_unlink, | |
2626 | .link = btrfs_link, | |
2627 | .mkdir = btrfs_mkdir, | |
2628 | .rmdir = btrfs_rmdir, | |
2629 | .rename = btrfs_rename, | |
2630 | .symlink = btrfs_symlink, | |
2631 | .setattr = btrfs_setattr, | |
618e21d5 | 2632 | .mknod = btrfs_mknod, |
5103e947 JB |
2633 | .setxattr = generic_setxattr, |
2634 | .getxattr = generic_getxattr, | |
2635 | .listxattr = btrfs_listxattr, | |
2636 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2637 | }; |
2638 | ||
2639 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2640 | .lookup = btrfs_lookup, | |
2641 | }; | |
2642 | ||
2643 | static struct file_operations btrfs_dir_file_operations = { | |
2644 | .llseek = generic_file_llseek, | |
2645 | .read = generic_read_dir, | |
2646 | .readdir = btrfs_readdir, | |
34287aa3 | 2647 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2648 | #ifdef CONFIG_COMPAT |
34287aa3 | 2649 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2650 | #endif |
2651 | }; | |
2652 | ||
07157aac CM |
2653 | static struct extent_map_ops btrfs_extent_map_ops = { |
2654 | .fill_delalloc = run_delalloc_range, | |
2655 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2656 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2657 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2658 | }; | |
2659 | ||
39279cc3 CM |
2660 | static struct address_space_operations btrfs_aops = { |
2661 | .readpage = btrfs_readpage, | |
2662 | .writepage = btrfs_writepage, | |
b293f02e | 2663 | .writepages = btrfs_writepages, |
3ab2fb5a | 2664 | .readpages = btrfs_readpages, |
39279cc3 CM |
2665 | .sync_page = block_sync_page, |
2666 | .prepare_write = btrfs_prepare_write, | |
2667 | .commit_write = btrfs_commit_write, | |
2668 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2669 | .invalidatepage = btrfs_invalidatepage, |
2670 | .releasepage = btrfs_releasepage, | |
2671 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2672 | }; |
2673 | ||
2674 | static struct address_space_operations btrfs_symlink_aops = { | |
2675 | .readpage = btrfs_readpage, | |
2676 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2677 | .invalidatepage = btrfs_invalidatepage, |
2678 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2679 | }; |
2680 | ||
2681 | static struct inode_operations btrfs_file_inode_operations = { | |
2682 | .truncate = btrfs_truncate, | |
2683 | .getattr = btrfs_getattr, | |
2684 | .setattr = btrfs_setattr, | |
5103e947 JB |
2685 | .setxattr = generic_setxattr, |
2686 | .getxattr = generic_getxattr, | |
2687 | .listxattr = btrfs_listxattr, | |
2688 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2689 | }; |
2690 | ||
618e21d5 JB |
2691 | static struct inode_operations btrfs_special_inode_operations = { |
2692 | .getattr = btrfs_getattr, | |
2693 | .setattr = btrfs_setattr, | |
2694 | }; | |
2695 | ||
39279cc3 CM |
2696 | static struct inode_operations btrfs_symlink_inode_operations = { |
2697 | .readlink = generic_readlink, | |
2698 | .follow_link = page_follow_link_light, | |
2699 | .put_link = page_put_link, | |
2700 | }; |