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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 56 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
57 | |
58 | static struct kmem_cache *btrfs_inode_cachep; | |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | |
60 | struct kmem_cache *btrfs_transaction_cachep; | |
61 | struct kmem_cache *btrfs_bit_radix_cachep; | |
62 | struct kmem_cache *btrfs_path_cachep; | |
63 | ||
64 | #define S_SHIFT 12 | |
65 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
66 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
67 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
68 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
69 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
70 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
71 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
72 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
73 | }; | |
74 | ||
1832a6d5 CM |
75 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
76 | int for_del) | |
77 | { | |
78 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
79 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
80 | u64 thresh; | |
81 | int ret = 0; | |
82 | ||
83 | if (for_del) | |
84 | thresh = (total * 90) / 100; | |
85 | else | |
86 | thresh = (total * 85) / 100; | |
87 | ||
88 | spin_lock(&root->fs_info->delalloc_lock); | |
89 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
90 | ret = -ENOSPC; | |
91 | spin_unlock(&root->fs_info->delalloc_lock); | |
92 | return ret; | |
93 | } | |
94 | ||
be20aa9d | 95 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
96 | { |
97 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
98 | struct btrfs_trans_handle *trans; | |
b888db2b | 99 | u64 alloc_hint = 0; |
db94535d | 100 | u64 num_bytes; |
c59f8951 | 101 | u64 cur_alloc_size; |
db94535d | 102 | u64 blocksize = root->sectorsize; |
be20aa9d CM |
103 | struct btrfs_key ins; |
104 | int ret; | |
b888db2b | 105 | |
b888db2b | 106 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 107 | BUG_ON(!trans); |
be20aa9d CM |
108 | btrfs_set_trans_block_group(trans, inode); |
109 | ||
db94535d | 110 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 111 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 112 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 113 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 114 | |
179e29e4 CM |
115 | if (alloc_hint == EXTENT_MAP_INLINE) |
116 | goto out; | |
117 | ||
c59f8951 CM |
118 | while(num_bytes > 0) { |
119 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
120 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
121 | root->root_key.objectid, | |
122 | trans->transid, | |
123 | inode->i_ino, start, 0, | |
124 | alloc_hint, (u64)-1, &ins, 1); | |
125 | if (ret) { | |
126 | WARN_ON(1); | |
127 | goto out; | |
128 | } | |
129 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
130 | start, ins.objectid, ins.offset, | |
131 | ins.offset); | |
132 | num_bytes -= cur_alloc_size; | |
133 | alloc_hint = ins.objectid + ins.offset; | |
134 | start += cur_alloc_size; | |
b888db2b | 135 | } |
b888db2b CM |
136 | out: |
137 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
138 | return ret; |
139 | } | |
140 | ||
141 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
142 | { | |
143 | u64 extent_start; | |
144 | u64 extent_end; | |
145 | u64 bytenr; | |
146 | u64 cow_end; | |
1832a6d5 | 147 | u64 loops = 0; |
be20aa9d CM |
148 | struct btrfs_root *root = BTRFS_I(inode)->root; |
149 | struct extent_buffer *leaf; | |
150 | int found_type; | |
151 | struct btrfs_path *path; | |
152 | struct btrfs_file_extent_item *item; | |
153 | int ret; | |
154 | int err; | |
155 | struct btrfs_key found_key; | |
156 | ||
157 | path = btrfs_alloc_path(); | |
158 | BUG_ON(!path); | |
159 | again: | |
160 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
161 | inode->i_ino, start, 0); | |
162 | if (ret < 0) { | |
163 | btrfs_free_path(path); | |
164 | return ret; | |
165 | } | |
166 | ||
167 | cow_end = end; | |
168 | if (ret != 0) { | |
169 | if (path->slots[0] == 0) | |
170 | goto not_found; | |
171 | path->slots[0]--; | |
172 | } | |
173 | ||
174 | leaf = path->nodes[0]; | |
175 | item = btrfs_item_ptr(leaf, path->slots[0], | |
176 | struct btrfs_file_extent_item); | |
177 | ||
178 | /* are we inside the extent that was found? */ | |
179 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
180 | found_type = btrfs_key_type(&found_key); | |
181 | if (found_key.objectid != inode->i_ino || | |
182 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
183 | goto not_found; | |
184 | } | |
185 | ||
186 | found_type = btrfs_file_extent_type(leaf, item); | |
187 | extent_start = found_key.offset; | |
188 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
189 | extent_end = extent_start + | |
190 | btrfs_file_extent_num_bytes(leaf, item); | |
191 | err = 0; | |
192 | ||
1832a6d5 CM |
193 | if (loops && start != extent_start) |
194 | goto not_found; | |
195 | ||
be20aa9d CM |
196 | if (start < extent_start || start >= extent_end) |
197 | goto not_found; | |
198 | ||
199 | cow_end = min(end, extent_end - 1); | |
200 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
201 | if (bytenr == 0) | |
202 | goto not_found; | |
203 | ||
be20aa9d CM |
204 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
205 | goto not_found; | |
206 | } | |
207 | ||
208 | start = extent_end; | |
209 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
210 | goto not_found; | |
211 | } | |
212 | loop: | |
213 | if (start > end) { | |
214 | btrfs_free_path(path); | |
215 | return 0; | |
216 | } | |
217 | btrfs_release_path(root, path); | |
1832a6d5 | 218 | loops++; |
be20aa9d CM |
219 | goto again; |
220 | ||
221 | not_found: | |
222 | cow_file_range(inode, start, cow_end); | |
223 | start = cow_end + 1; | |
224 | goto loop; | |
225 | } | |
226 | ||
227 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
228 | { | |
229 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1832a6d5 | 230 | u64 num_bytes; |
be20aa9d CM |
231 | int ret; |
232 | ||
233 | mutex_lock(&root->fs_info->fs_mutex); | |
234 | if (btrfs_test_opt(root, NODATACOW)) | |
235 | ret = run_delalloc_nocow(inode, start, end); | |
236 | else | |
237 | ret = cow_file_range(inode, start, end); | |
1832a6d5 CM |
238 | |
239 | spin_lock(&root->fs_info->delalloc_lock); | |
240 | num_bytes = end + 1 - start; | |
241 | if (root->fs_info->delalloc_bytes < num_bytes) { | |
242 | printk("delalloc accounting error total %llu sub %llu\n", | |
243 | root->fs_info->delalloc_bytes, num_bytes); | |
244 | } else { | |
245 | root->fs_info->delalloc_bytes -= num_bytes; | |
246 | } | |
247 | spin_unlock(&root->fs_info->delalloc_lock); | |
248 | ||
b888db2b CM |
249 | mutex_unlock(&root->fs_info->fs_mutex); |
250 | return ret; | |
251 | } | |
252 | ||
07157aac CM |
253 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
254 | { | |
255 | struct inode *inode = page->mapping->host; | |
256 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
257 | struct btrfs_trans_handle *trans; | |
258 | char *kaddr; | |
b6cda9bc | 259 | int ret = 0; |
35ebb934 | 260 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
261 | size_t offset = start - page_start; |
262 | ||
b6cda9bc CM |
263 | if (btrfs_test_opt(root, NODATASUM)) |
264 | return 0; | |
265 | ||
07157aac CM |
266 | mutex_lock(&root->fs_info->fs_mutex); |
267 | trans = btrfs_start_transaction(root, 1); | |
268 | btrfs_set_trans_block_group(trans, inode); | |
269 | kaddr = kmap(page); | |
f578d4bd | 270 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
271 | start, kaddr + offset, end - start + 1); |
272 | kunmap(page); | |
273 | ret = btrfs_end_transaction(trans, root); | |
274 | BUG_ON(ret); | |
275 | mutex_unlock(&root->fs_info->fs_mutex); | |
276 | return ret; | |
277 | } | |
278 | ||
279 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
280 | { | |
281 | int ret = 0; | |
282 | struct inode *inode = page->mapping->host; | |
283 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
284 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
285 | struct btrfs_csum_item *item; | |
286 | struct btrfs_path *path = NULL; | |
ff79f819 | 287 | u32 csum; |
07157aac | 288 | |
b6cda9bc CM |
289 | if (btrfs_test_opt(root, NODATASUM)) |
290 | return 0; | |
291 | ||
07157aac CM |
292 | mutex_lock(&root->fs_info->fs_mutex); |
293 | path = btrfs_alloc_path(); | |
294 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
295 | if (IS_ERR(item)) { | |
296 | ret = PTR_ERR(item); | |
297 | /* a csum that isn't present is a preallocated region. */ | |
298 | if (ret == -ENOENT || ret == -EFBIG) | |
299 | ret = 0; | |
ff79f819 | 300 | csum = 0; |
07157aac CM |
301 | goto out; |
302 | } | |
ff79f819 CM |
303 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
304 | BTRFS_CRC32_SIZE); | |
305 | set_state_private(em_tree, start, csum); | |
07157aac CM |
306 | out: |
307 | if (path) | |
308 | btrfs_free_path(path); | |
309 | mutex_unlock(&root->fs_info->fs_mutex); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
314 | { | |
35ebb934 | 315 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 316 | struct inode *inode = page->mapping->host; |
07157aac CM |
317 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
318 | char *kaddr; | |
319 | u64 private; | |
320 | int ret; | |
ff79f819 CM |
321 | struct btrfs_root *root = BTRFS_I(inode)->root; |
322 | u32 csum = ~(u32)0; | |
bbf0d006 | 323 | unsigned long flags; |
07157aac | 324 | |
b6cda9bc CM |
325 | if (btrfs_test_opt(root, NODATASUM)) |
326 | return 0; | |
327 | ||
07157aac | 328 | ret = get_state_private(em_tree, start, &private); |
bbf0d006 | 329 | local_irq_save(flags); |
07157aac CM |
330 | kaddr = kmap_atomic(page, KM_IRQ0); |
331 | if (ret) { | |
332 | goto zeroit; | |
333 | } | |
ff79f819 CM |
334 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
335 | btrfs_csum_final(csum, (char *)&csum); | |
336 | if (csum != private) { | |
07157aac CM |
337 | goto zeroit; |
338 | } | |
339 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 340 | local_irq_restore(flags); |
07157aac CM |
341 | return 0; |
342 | ||
343 | zeroit: | |
344 | printk("btrfs csum failed ino %lu off %llu\n", | |
345 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
346 | memset(kaddr + offset, 1, end - start + 1); |
347 | flush_dcache_page(page); | |
07157aac | 348 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 349 | local_irq_restore(flags); |
07157aac CM |
350 | return 0; |
351 | } | |
b888db2b | 352 | |
39279cc3 CM |
353 | void btrfs_read_locked_inode(struct inode *inode) |
354 | { | |
355 | struct btrfs_path *path; | |
5f39d397 | 356 | struct extent_buffer *leaf; |
39279cc3 | 357 | struct btrfs_inode_item *inode_item; |
5f39d397 | 358 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
359 | struct btrfs_root *root = BTRFS_I(inode)->root; |
360 | struct btrfs_key location; | |
361 | u64 alloc_group_block; | |
618e21d5 | 362 | u32 rdev; |
39279cc3 CM |
363 | int ret; |
364 | ||
365 | path = btrfs_alloc_path(); | |
366 | BUG_ON(!path); | |
39279cc3 CM |
367 | mutex_lock(&root->fs_info->fs_mutex); |
368 | ||
369 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
370 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 371 | if (ret) |
39279cc3 | 372 | goto make_bad; |
39279cc3 | 373 | |
5f39d397 CM |
374 | leaf = path->nodes[0]; |
375 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
376 | struct btrfs_inode_item); | |
377 | ||
378 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
379 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
380 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
381 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
382 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
383 | ||
384 | tspec = btrfs_inode_atime(inode_item); | |
385 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
386 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
387 | ||
388 | tspec = btrfs_inode_mtime(inode_item); | |
389 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
390 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
391 | ||
392 | tspec = btrfs_inode_ctime(inode_item); | |
393 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
394 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
395 | ||
396 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
397 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 398 | inode->i_rdev = 0; |
5f39d397 CM |
399 | rdev = btrfs_inode_rdev(leaf, inode_item); |
400 | ||
401 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
402 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
403 | alloc_group_block); | |
404 | ||
405 | btrfs_free_path(path); | |
406 | inode_item = NULL; | |
407 | ||
408 | mutex_unlock(&root->fs_info->fs_mutex); | |
409 | ||
410 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
411 | case S_IFREG: |
412 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 413 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
414 | inode->i_fop = &btrfs_file_operations; |
415 | inode->i_op = &btrfs_file_inode_operations; | |
416 | break; | |
417 | case S_IFDIR: | |
418 | inode->i_fop = &btrfs_dir_file_operations; | |
419 | if (root == root->fs_info->tree_root) | |
420 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
421 | else | |
422 | inode->i_op = &btrfs_dir_inode_operations; | |
423 | break; | |
424 | case S_IFLNK: | |
425 | inode->i_op = &btrfs_symlink_inode_operations; | |
426 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
427 | break; | |
618e21d5 JB |
428 | default: |
429 | init_special_inode(inode, inode->i_mode, rdev); | |
430 | break; | |
39279cc3 CM |
431 | } |
432 | return; | |
433 | ||
434 | make_bad: | |
435 | btrfs_release_path(root, path); | |
436 | btrfs_free_path(path); | |
437 | mutex_unlock(&root->fs_info->fs_mutex); | |
438 | make_bad_inode(inode); | |
439 | } | |
440 | ||
5f39d397 CM |
441 | static void fill_inode_item(struct extent_buffer *leaf, |
442 | struct btrfs_inode_item *item, | |
39279cc3 CM |
443 | struct inode *inode) |
444 | { | |
5f39d397 CM |
445 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
446 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
447 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
448 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
449 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
450 | ||
451 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
452 | inode->i_atime.tv_sec); | |
453 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
454 | inode->i_atime.tv_nsec); | |
455 | ||
456 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
457 | inode->i_mtime.tv_sec); | |
458 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
459 | inode->i_mtime.tv_nsec); | |
460 | ||
461 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
462 | inode->i_ctime.tv_sec); | |
463 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
464 | inode->i_ctime.tv_nsec); | |
465 | ||
466 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
467 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
468 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
469 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
470 | BTRFS_I(inode)->block_group->key.objectid); |
471 | } | |
472 | ||
a52d9a80 | 473 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
474 | struct btrfs_root *root, |
475 | struct inode *inode) | |
476 | { | |
477 | struct btrfs_inode_item *inode_item; | |
478 | struct btrfs_path *path; | |
5f39d397 | 479 | struct extent_buffer *leaf; |
39279cc3 CM |
480 | int ret; |
481 | ||
482 | path = btrfs_alloc_path(); | |
483 | BUG_ON(!path); | |
39279cc3 CM |
484 | ret = btrfs_lookup_inode(trans, root, path, |
485 | &BTRFS_I(inode)->location, 1); | |
486 | if (ret) { | |
487 | if (ret > 0) | |
488 | ret = -ENOENT; | |
489 | goto failed; | |
490 | } | |
491 | ||
5f39d397 CM |
492 | leaf = path->nodes[0]; |
493 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
494 | struct btrfs_inode_item); |
495 | ||
5f39d397 CM |
496 | fill_inode_item(leaf, inode_item, inode); |
497 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 498 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
499 | ret = 0; |
500 | failed: | |
501 | btrfs_release_path(root, path); | |
502 | btrfs_free_path(path); | |
503 | return ret; | |
504 | } | |
505 | ||
506 | ||
507 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
508 | struct btrfs_root *root, | |
509 | struct inode *dir, | |
510 | struct dentry *dentry) | |
511 | { | |
512 | struct btrfs_path *path; | |
513 | const char *name = dentry->d_name.name; | |
514 | int name_len = dentry->d_name.len; | |
515 | int ret = 0; | |
5f39d397 | 516 | struct extent_buffer *leaf; |
39279cc3 | 517 | struct btrfs_dir_item *di; |
5f39d397 | 518 | struct btrfs_key key; |
39279cc3 CM |
519 | |
520 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
521 | if (!path) { |
522 | ret = -ENOMEM; | |
523 | goto err; | |
524 | } | |
525 | ||
39279cc3 CM |
526 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
527 | name, name_len, -1); | |
528 | if (IS_ERR(di)) { | |
529 | ret = PTR_ERR(di); | |
530 | goto err; | |
531 | } | |
532 | if (!di) { | |
533 | ret = -ENOENT; | |
534 | goto err; | |
535 | } | |
5f39d397 CM |
536 | leaf = path->nodes[0]; |
537 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 538 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
539 | if (ret) |
540 | goto err; | |
39279cc3 CM |
541 | btrfs_release_path(root, path); |
542 | ||
543 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 544 | key.objectid, name, name_len, -1); |
39279cc3 CM |
545 | if (IS_ERR(di)) { |
546 | ret = PTR_ERR(di); | |
547 | goto err; | |
548 | } | |
549 | if (!di) { | |
550 | ret = -ENOENT; | |
551 | goto err; | |
552 | } | |
553 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
554 | |
555 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
556 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
557 | dentry->d_inode->i_ino, | |
558 | dentry->d_parent->d_inode->i_ino); | |
559 | if (ret) { | |
560 | printk("failed to delete reference to %.*s, " | |
561 | "inode %lu parent %lu\n", name_len, name, | |
562 | dentry->d_inode->i_ino, | |
563 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 564 | } |
39279cc3 CM |
565 | err: |
566 | btrfs_free_path(path); | |
567 | if (!ret) { | |
568 | dir->i_size -= name_len * 2; | |
79c44584 | 569 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 570 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
571 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
572 | dentry->d_inode->i_nlink--; | |
573 | #else | |
39279cc3 | 574 | drop_nlink(dentry->d_inode); |
6da6abae | 575 | #endif |
54aa1f4d | 576 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
577 | dir->i_sb->s_dirt = 1; |
578 | } | |
579 | return ret; | |
580 | } | |
581 | ||
582 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
583 | { | |
584 | struct btrfs_root *root; | |
585 | struct btrfs_trans_handle *trans; | |
586 | int ret; | |
1832a6d5 | 587 | unsigned long nr = 0; |
39279cc3 CM |
588 | |
589 | root = BTRFS_I(dir)->root; | |
590 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
591 | |
592 | ret = btrfs_check_free_space(root, 1, 1); | |
593 | if (ret) | |
594 | goto fail; | |
595 | ||
39279cc3 | 596 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 597 | |
39279cc3 CM |
598 | btrfs_set_trans_block_group(trans, dir); |
599 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 600 | nr = trans->blocks_used; |
5f39d397 | 601 | |
39279cc3 | 602 | btrfs_end_transaction(trans, root); |
1832a6d5 | 603 | fail: |
39279cc3 | 604 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 605 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
606 | return ret; |
607 | } | |
608 | ||
609 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
610 | { | |
611 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 612 | int err = 0; |
39279cc3 CM |
613 | int ret; |
614 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 615 | struct btrfs_trans_handle *trans; |
1832a6d5 | 616 | unsigned long nr = 0; |
39279cc3 | 617 | |
134d4512 Y |
618 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
619 | return -ENOTEMPTY; | |
620 | ||
39279cc3 | 621 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
622 | ret = btrfs_check_free_space(root, 1, 1); |
623 | if (ret) | |
624 | goto fail; | |
625 | ||
39279cc3 CM |
626 | trans = btrfs_start_transaction(root, 1); |
627 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
628 | |
629 | /* now the directory is empty */ | |
630 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
631 | if (!err) { | |
632 | inode->i_size = 0; | |
633 | } | |
3954401f | 634 | |
d3c2fdcf | 635 | nr = trans->blocks_used; |
39279cc3 | 636 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 637 | fail: |
134d4512 | 638 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 639 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 640 | |
39279cc3 CM |
641 | if (ret && !err) |
642 | err = ret; | |
643 | return err; | |
644 | } | |
645 | ||
646 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
647 | struct btrfs_root *root, | |
648 | struct inode *inode) | |
649 | { | |
650 | struct btrfs_path *path; | |
651 | int ret; | |
652 | ||
653 | clear_inode(inode); | |
654 | ||
655 | path = btrfs_alloc_path(); | |
656 | BUG_ON(!path); | |
39279cc3 CM |
657 | ret = btrfs_lookup_inode(trans, root, path, |
658 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
659 | if (ret > 0) |
660 | ret = -ENOENT; | |
661 | if (!ret) | |
662 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
663 | btrfs_free_path(path); |
664 | return ret; | |
665 | } | |
666 | ||
39279cc3 CM |
667 | /* |
668 | * this can truncate away extent items, csum items and directory items. | |
669 | * It starts at a high offset and removes keys until it can't find | |
670 | * any higher than i_size. | |
671 | * | |
672 | * csum items that cross the new i_size are truncated to the new size | |
673 | * as well. | |
674 | */ | |
675 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
676 | struct btrfs_root *root, | |
677 | struct inode *inode) | |
678 | { | |
679 | int ret; | |
680 | struct btrfs_path *path; | |
681 | struct btrfs_key key; | |
5f39d397 | 682 | struct btrfs_key found_key; |
39279cc3 | 683 | u32 found_type; |
5f39d397 | 684 | struct extent_buffer *leaf; |
39279cc3 CM |
685 | struct btrfs_file_extent_item *fi; |
686 | u64 extent_start = 0; | |
db94535d | 687 | u64 extent_num_bytes = 0; |
39279cc3 | 688 | u64 item_end = 0; |
7bb86316 | 689 | u64 root_gen = 0; |
d8d5f3e1 | 690 | u64 root_owner = 0; |
39279cc3 CM |
691 | int found_extent; |
692 | int del_item; | |
179e29e4 | 693 | int extent_type = -1; |
39279cc3 | 694 | |
a52d9a80 | 695 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 696 | path = btrfs_alloc_path(); |
3c69faec | 697 | path->reada = -1; |
39279cc3 | 698 | BUG_ON(!path); |
5f39d397 | 699 | |
39279cc3 CM |
700 | /* FIXME, add redo link to tree so we don't leak on crash */ |
701 | key.objectid = inode->i_ino; | |
702 | key.offset = (u64)-1; | |
5f39d397 CM |
703 | key.type = (u8)-1; |
704 | ||
39279cc3 CM |
705 | while(1) { |
706 | btrfs_init_path(path); | |
707 | fi = NULL; | |
708 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
709 | if (ret < 0) { | |
710 | goto error; | |
711 | } | |
712 | if (ret > 0) { | |
713 | BUG_ON(path->slots[0] == 0); | |
714 | path->slots[0]--; | |
715 | } | |
5f39d397 CM |
716 | leaf = path->nodes[0]; |
717 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
718 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 719 | |
5f39d397 | 720 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 721 | break; |
5f39d397 | 722 | |
39279cc3 CM |
723 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
724 | found_type != BTRFS_DIR_ITEM_KEY && | |
725 | found_type != BTRFS_DIR_INDEX_KEY && | |
726 | found_type != BTRFS_EXTENT_DATA_KEY) | |
727 | break; | |
728 | ||
5f39d397 | 729 | item_end = found_key.offset; |
39279cc3 | 730 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 731 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 732 | struct btrfs_file_extent_item); |
179e29e4 CM |
733 | extent_type = btrfs_file_extent_type(leaf, fi); |
734 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 735 | item_end += |
db94535d | 736 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
737 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
738 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
739 | path->slots[0]); | |
740 | item_end += btrfs_file_extent_inline_len(leaf, | |
741 | item); | |
39279cc3 | 742 | } |
008630c1 | 743 | item_end--; |
39279cc3 CM |
744 | } |
745 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
746 | ret = btrfs_csum_truncate(trans, root, path, | |
747 | inode->i_size); | |
748 | BUG_ON(ret); | |
749 | } | |
008630c1 | 750 | if (item_end < inode->i_size) { |
b888db2b CM |
751 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
752 | found_type = BTRFS_INODE_ITEM_KEY; | |
753 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
754 | found_type = BTRFS_CSUM_ITEM_KEY; | |
755 | } else if (found_type) { | |
756 | found_type--; | |
757 | } else { | |
758 | break; | |
39279cc3 | 759 | } |
a61721d5 | 760 | btrfs_set_key_type(&key, found_type); |
65555a06 | 761 | btrfs_release_path(root, path); |
b888db2b | 762 | continue; |
39279cc3 | 763 | } |
5f39d397 | 764 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
765 | del_item = 1; |
766 | else | |
767 | del_item = 0; | |
768 | found_extent = 0; | |
769 | ||
770 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
771 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
772 | goto delete; | |
773 | ||
774 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 775 | u64 num_dec; |
db94535d | 776 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 777 | if (!del_item) { |
db94535d CM |
778 | u64 orig_num_bytes = |
779 | btrfs_file_extent_num_bytes(leaf, fi); | |
780 | extent_num_bytes = inode->i_size - | |
5f39d397 | 781 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
782 | btrfs_set_file_extent_num_bytes(leaf, fi, |
783 | extent_num_bytes); | |
784 | num_dec = (orig_num_bytes - | |
785 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
786 | if (extent_start != 0) { |
787 | inode->i_blocks -= num_dec; | |
788 | } | |
5f39d397 | 789 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 790 | } else { |
db94535d CM |
791 | extent_num_bytes = |
792 | btrfs_file_extent_disk_num_bytes(leaf, | |
793 | fi); | |
39279cc3 | 794 | /* FIXME blocksize != 4096 */ |
db94535d CM |
795 | num_dec = btrfs_file_extent_num_bytes(leaf, |
796 | fi) >> 9; | |
39279cc3 CM |
797 | if (extent_start != 0) { |
798 | found_extent = 1; | |
799 | inode->i_blocks -= num_dec; | |
800 | } | |
d8d5f3e1 CM |
801 | root_gen = btrfs_header_generation(leaf); |
802 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 803 | } |
179e29e4 CM |
804 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
805 | !del_item) { | |
806 | u32 newsize = inode->i_size - found_key.offset; | |
807 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
808 | ret = btrfs_truncate_item(trans, root, path, | |
809 | newsize, 1); | |
810 | BUG_ON(ret); | |
39279cc3 | 811 | } |
179e29e4 | 812 | delete: |
39279cc3 CM |
813 | if (del_item) { |
814 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
815 | if (ret) |
816 | goto error; | |
39279cc3 CM |
817 | } else { |
818 | break; | |
819 | } | |
820 | btrfs_release_path(root, path); | |
821 | if (found_extent) { | |
822 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 823 | extent_num_bytes, |
d8d5f3e1 | 824 | root_owner, |
7bb86316 CM |
825 | root_gen, inode->i_ino, |
826 | found_key.offset, 0); | |
39279cc3 CM |
827 | BUG_ON(ret); |
828 | } | |
829 | } | |
830 | ret = 0; | |
831 | error: | |
832 | btrfs_release_path(root, path); | |
833 | btrfs_free_path(path); | |
834 | inode->i_sb->s_dirt = 1; | |
835 | return ret; | |
836 | } | |
837 | ||
b888db2b | 838 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
839 | size_t zero_start) |
840 | { | |
841 | char *kaddr; | |
b888db2b | 842 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
1832a6d5 | 843 | struct btrfs_root *root = BTRFS_I(inode)->root; |
35ebb934 | 844 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 845 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 CM |
846 | u64 existing_delalloc; |
847 | u64 delalloc_start; | |
848 | int ret = 0; | |
a52d9a80 | 849 | |
190662b2 | 850 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 851 | set_page_extent_mapped(page); |
a52d9a80 | 852 | |
b888db2b | 853 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
1832a6d5 CM |
854 | delalloc_start = page_start; |
855 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree, | |
856 | &delalloc_start, page_end, | |
857 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
b888db2b CM |
858 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, |
859 | page_end, GFP_NOFS); | |
1832a6d5 CM |
860 | |
861 | spin_lock(&root->fs_info->delalloc_lock); | |
862 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc; | |
863 | spin_unlock(&root->fs_info->delalloc_lock); | |
864 | ||
a52d9a80 | 865 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 866 | kaddr = kmap(page); |
a52d9a80 CM |
867 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
868 | flush_dcache_page(page); | |
b888db2b | 869 | kunmap(page); |
a52d9a80 | 870 | } |
b888db2b CM |
871 | set_page_dirty(page); |
872 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 873 | |
a52d9a80 CM |
874 | return ret; |
875 | } | |
876 | ||
39279cc3 CM |
877 | /* |
878 | * taken from block_truncate_page, but does cow as it zeros out | |
879 | * any bytes left in the last page in the file. | |
880 | */ | |
881 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
882 | { | |
883 | struct inode *inode = mapping->host; | |
db94535d CM |
884 | struct btrfs_root *root = BTRFS_I(inode)->root; |
885 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
886 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
887 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
888 | struct page *page; | |
39279cc3 | 889 | int ret = 0; |
a52d9a80 | 890 | u64 page_start; |
39279cc3 CM |
891 | |
892 | if ((offset & (blocksize - 1)) == 0) | |
893 | goto out; | |
894 | ||
db94535d | 895 | down_read(&root->snap_sem); |
39279cc3 CM |
896 | ret = -ENOMEM; |
897 | page = grab_cache_page(mapping, index); | |
898 | if (!page) | |
899 | goto out; | |
39279cc3 | 900 | if (!PageUptodate(page)) { |
9ebefb18 | 901 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
902 | lock_page(page); |
903 | if (!PageUptodate(page)) { | |
904 | ret = -EIO; | |
905 | goto out; | |
906 | } | |
907 | } | |
35ebb934 | 908 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 909 | |
b888db2b | 910 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 911 | |
39279cc3 CM |
912 | unlock_page(page); |
913 | page_cache_release(page); | |
011410bd | 914 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
915 | out: |
916 | return ret; | |
917 | } | |
918 | ||
919 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
920 | { | |
921 | struct inode *inode = dentry->d_inode; | |
922 | int err; | |
923 | ||
924 | err = inode_change_ok(inode, attr); | |
925 | if (err) | |
926 | return err; | |
927 | ||
928 | if (S_ISREG(inode->i_mode) && | |
929 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
930 | struct btrfs_trans_handle *trans; | |
931 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
932 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
933 | ||
5f39d397 | 934 | u64 mask = root->sectorsize - 1; |
39279cc3 | 935 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 936 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 937 | u64 hole_size; |
179e29e4 | 938 | u64 alloc_hint = 0; |
39279cc3 CM |
939 | |
940 | if (attr->ia_size <= pos) | |
941 | goto out; | |
942 | ||
1832a6d5 CM |
943 | mutex_lock(&root->fs_info->fs_mutex); |
944 | err = btrfs_check_free_space(root, 1, 0); | |
945 | mutex_unlock(&root->fs_info->fs_mutex); | |
946 | if (err) | |
947 | goto fail; | |
948 | ||
39279cc3 CM |
949 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
950 | ||
2bf5a725 | 951 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 952 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
953 | |
954 | mutex_lock(&root->fs_info->fs_mutex); | |
955 | trans = btrfs_start_transaction(root, 1); | |
956 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 957 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
958 | pos, pos + hole_size, pos, |
959 | &alloc_hint); | |
2bf5a725 | 960 | |
179e29e4 CM |
961 | if (alloc_hint != EXTENT_MAP_INLINE) { |
962 | err = btrfs_insert_file_extent(trans, root, | |
963 | inode->i_ino, | |
964 | pos, 0, 0, hole_size); | |
965 | } | |
39279cc3 CM |
966 | btrfs_end_transaction(trans, root); |
967 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 968 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
969 | if (err) |
970 | return err; | |
39279cc3 CM |
971 | } |
972 | out: | |
973 | err = inode_setattr(inode, attr); | |
1832a6d5 | 974 | fail: |
39279cc3 CM |
975 | return err; |
976 | } | |
977 | void btrfs_delete_inode(struct inode *inode) | |
978 | { | |
979 | struct btrfs_trans_handle *trans; | |
980 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 981 | unsigned long nr; |
39279cc3 CM |
982 | int ret; |
983 | ||
984 | truncate_inode_pages(&inode->i_data, 0); | |
985 | if (is_bad_inode(inode)) { | |
986 | goto no_delete; | |
987 | } | |
5f39d397 | 988 | |
39279cc3 CM |
989 | inode->i_size = 0; |
990 | mutex_lock(&root->fs_info->fs_mutex); | |
991 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 992 | |
39279cc3 CM |
993 | btrfs_set_trans_block_group(trans, inode); |
994 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
995 | if (ret) |
996 | goto no_delete_lock; | |
997 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
998 | if (ret) |
999 | goto no_delete_lock; | |
1000 | ret = btrfs_free_inode(trans, root, inode); | |
1001 | if (ret) | |
1002 | goto no_delete_lock; | |
d3c2fdcf | 1003 | nr = trans->blocks_used; |
5f39d397 | 1004 | |
39279cc3 CM |
1005 | btrfs_end_transaction(trans, root); |
1006 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1007 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1008 | return; |
54aa1f4d CM |
1009 | |
1010 | no_delete_lock: | |
d3c2fdcf | 1011 | nr = trans->blocks_used; |
54aa1f4d CM |
1012 | btrfs_end_transaction(trans, root); |
1013 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1014 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1015 | no_delete: |
1016 | clear_inode(inode); | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * this returns the key found in the dir entry in the location pointer. | |
1021 | * If no dir entries were found, location->objectid is 0. | |
1022 | */ | |
1023 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1024 | struct btrfs_key *location) | |
1025 | { | |
1026 | const char *name = dentry->d_name.name; | |
1027 | int namelen = dentry->d_name.len; | |
1028 | struct btrfs_dir_item *di; | |
1029 | struct btrfs_path *path; | |
1030 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1031 | int ret = 0; |
39279cc3 | 1032 | |
3954401f CM |
1033 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1034 | location->objectid = dir->i_ino; | |
1035 | location->type = BTRFS_INODE_ITEM_KEY; | |
1036 | location->offset = 0; | |
1037 | return 0; | |
1038 | } | |
39279cc3 CM |
1039 | path = btrfs_alloc_path(); |
1040 | BUG_ON(!path); | |
3954401f | 1041 | |
7a720536 | 1042 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1043 | struct btrfs_key key; |
1044 | struct extent_buffer *leaf; | |
1045 | u32 nritems; | |
1046 | int slot; | |
1047 | ||
1048 | key.objectid = dir->i_ino; | |
1049 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1050 | key.offset = 0; | |
1051 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1052 | BUG_ON(ret == 0); | |
1053 | ret = 0; | |
1054 | ||
1055 | leaf = path->nodes[0]; | |
1056 | slot = path->slots[0]; | |
1057 | nritems = btrfs_header_nritems(leaf); | |
1058 | if (slot >= nritems) | |
1059 | goto out_err; | |
1060 | ||
1061 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1062 | if (key.objectid != dir->i_ino || | |
1063 | key.type != BTRFS_INODE_REF_KEY) { | |
1064 | goto out_err; | |
1065 | } | |
1066 | location->objectid = key.offset; | |
1067 | location->type = BTRFS_INODE_ITEM_KEY; | |
1068 | location->offset = 0; | |
1069 | goto out; | |
1070 | } | |
1071 | ||
39279cc3 CM |
1072 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1073 | namelen, 0); | |
0d9f7f3e Y |
1074 | if (IS_ERR(di)) |
1075 | ret = PTR_ERR(di); | |
39279cc3 | 1076 | if (!di || IS_ERR(di)) { |
3954401f | 1077 | goto out_err; |
39279cc3 | 1078 | } |
5f39d397 | 1079 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1080 | out: |
39279cc3 CM |
1081 | btrfs_free_path(path); |
1082 | return ret; | |
3954401f CM |
1083 | out_err: |
1084 | location->objectid = 0; | |
1085 | goto out; | |
39279cc3 CM |
1086 | } |
1087 | ||
1088 | /* | |
1089 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1090 | * needs to be changed to reflect the root directory of the tree root. This | |
1091 | * is kind of like crossing a mount point. | |
1092 | */ | |
1093 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1094 | struct btrfs_key *location, | |
58176a96 JB |
1095 | struct btrfs_root **sub_root, |
1096 | struct dentry *dentry) | |
39279cc3 CM |
1097 | { |
1098 | struct btrfs_path *path; | |
1099 | struct btrfs_root_item *ri; | |
1100 | ||
1101 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1102 | return 0; | |
1103 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1104 | return 0; | |
1105 | ||
1106 | path = btrfs_alloc_path(); | |
1107 | BUG_ON(!path); | |
1108 | mutex_lock(&root->fs_info->fs_mutex); | |
1109 | ||
58176a96 JB |
1110 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1111 | dentry->d_name.name, | |
1112 | dentry->d_name.len); | |
39279cc3 CM |
1113 | if (IS_ERR(*sub_root)) |
1114 | return PTR_ERR(*sub_root); | |
1115 | ||
1116 | ri = &(*sub_root)->root_item; | |
1117 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1118 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1119 | location->offset = 0; | |
1120 | ||
1121 | btrfs_free_path(path); | |
1122 | mutex_unlock(&root->fs_info->fs_mutex); | |
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1127 | { | |
1128 | struct btrfs_iget_args *args = p; | |
1129 | inode->i_ino = args->ino; | |
1130 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
1131 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1132 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1133 | return 0; |
1134 | } | |
1135 | ||
1136 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1137 | { | |
1138 | struct btrfs_iget_args *args = opaque; | |
1139 | return (args->ino == inode->i_ino && | |
1140 | args->root == BTRFS_I(inode)->root); | |
1141 | } | |
1142 | ||
1143 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
1144 | struct btrfs_root *root) | |
1145 | { | |
1146 | struct inode *inode; | |
1147 | struct btrfs_iget_args args; | |
1148 | args.ino = objectid; | |
1149 | args.root = root; | |
1150 | ||
1151 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1152 | btrfs_init_locked_inode, | |
1153 | (void *)&args); | |
1154 | return inode; | |
1155 | } | |
1156 | ||
1157 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1158 | struct nameidata *nd) | |
1159 | { | |
1160 | struct inode * inode; | |
1161 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1162 | struct btrfs_root *root = bi->root; | |
1163 | struct btrfs_root *sub_root = root; | |
1164 | struct btrfs_key location; | |
1165 | int ret; | |
1166 | ||
1167 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1168 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1169 | |
39279cc3 CM |
1170 | mutex_lock(&root->fs_info->fs_mutex); |
1171 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1172 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1173 | |
39279cc3 CM |
1174 | if (ret < 0) |
1175 | return ERR_PTR(ret); | |
5f39d397 | 1176 | |
39279cc3 CM |
1177 | inode = NULL; |
1178 | if (location.objectid) { | |
58176a96 JB |
1179 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1180 | dentry); | |
39279cc3 CM |
1181 | if (ret < 0) |
1182 | return ERR_PTR(ret); | |
1183 | if (ret > 0) | |
1184 | return ERR_PTR(-ENOENT); | |
1185 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1186 | sub_root); | |
1187 | if (!inode) | |
1188 | return ERR_PTR(-EACCES); | |
1189 | if (inode->i_state & I_NEW) { | |
1190 | /* the inode and parent dir are two different roots */ | |
1191 | if (sub_root != root) { | |
1192 | igrab(inode); | |
1193 | sub_root->inode = inode; | |
1194 | } | |
1195 | BTRFS_I(inode)->root = sub_root; | |
1196 | memcpy(&BTRFS_I(inode)->location, &location, | |
1197 | sizeof(location)); | |
1198 | btrfs_read_locked_inode(inode); | |
1199 | unlock_new_inode(inode); | |
1200 | } | |
1201 | } | |
1202 | return d_splice_alias(inode, dentry); | |
1203 | } | |
1204 | ||
39279cc3 CM |
1205 | static unsigned char btrfs_filetype_table[] = { |
1206 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1207 | }; | |
1208 | ||
1209 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1210 | { | |
6da6abae | 1211 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1212 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1213 | struct btrfs_item *item; | |
1214 | struct btrfs_dir_item *di; | |
1215 | struct btrfs_key key; | |
5f39d397 | 1216 | struct btrfs_key found_key; |
39279cc3 CM |
1217 | struct btrfs_path *path; |
1218 | int ret; | |
1219 | u32 nritems; | |
5f39d397 | 1220 | struct extent_buffer *leaf; |
39279cc3 CM |
1221 | int slot; |
1222 | int advance; | |
1223 | unsigned char d_type; | |
1224 | int over = 0; | |
1225 | u32 di_cur; | |
1226 | u32 di_total; | |
1227 | u32 di_len; | |
1228 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1229 | char tmp_name[32]; |
1230 | char *name_ptr; | |
1231 | int name_len; | |
39279cc3 CM |
1232 | |
1233 | /* FIXME, use a real flag for deciding about the key type */ | |
1234 | if (root->fs_info->tree_root == root) | |
1235 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1236 | |
3954401f CM |
1237 | /* special case for "." */ |
1238 | if (filp->f_pos == 0) { | |
1239 | over = filldir(dirent, ".", 1, | |
1240 | 1, inode->i_ino, | |
1241 | DT_DIR); | |
1242 | if (over) | |
1243 | return 0; | |
1244 | filp->f_pos = 1; | |
1245 | } | |
1246 | ||
39279cc3 CM |
1247 | mutex_lock(&root->fs_info->fs_mutex); |
1248 | key.objectid = inode->i_ino; | |
3954401f CM |
1249 | path = btrfs_alloc_path(); |
1250 | path->reada = 2; | |
1251 | ||
1252 | /* special case for .., just use the back ref */ | |
1253 | if (filp->f_pos == 1) { | |
1254 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1255 | key.offset = 0; | |
1256 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1257 | BUG_ON(ret == 0); | |
1258 | leaf = path->nodes[0]; | |
1259 | slot = path->slots[0]; | |
1260 | nritems = btrfs_header_nritems(leaf); | |
1261 | if (slot >= nritems) { | |
1262 | btrfs_release_path(root, path); | |
1263 | goto read_dir_items; | |
1264 | } | |
1265 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1266 | btrfs_release_path(root, path); | |
1267 | if (found_key.objectid != key.objectid || | |
1268 | found_key.type != BTRFS_INODE_REF_KEY) | |
1269 | goto read_dir_items; | |
1270 | over = filldir(dirent, "..", 2, | |
1271 | 2, found_key.offset, DT_DIR); | |
1272 | if (over) | |
1273 | goto nopos; | |
1274 | filp->f_pos = 2; | |
1275 | } | |
1276 | ||
1277 | read_dir_items: | |
39279cc3 CM |
1278 | btrfs_set_key_type(&key, key_type); |
1279 | key.offset = filp->f_pos; | |
5f39d397 | 1280 | |
39279cc3 CM |
1281 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1282 | if (ret < 0) | |
1283 | goto err; | |
1284 | advance = 0; | |
39279cc3 | 1285 | while(1) { |
5f39d397 CM |
1286 | leaf = path->nodes[0]; |
1287 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1288 | slot = path->slots[0]; |
1289 | if (advance || slot >= nritems) { | |
1290 | if (slot >= nritems -1) { | |
39279cc3 CM |
1291 | ret = btrfs_next_leaf(root, path); |
1292 | if (ret) | |
1293 | break; | |
5f39d397 CM |
1294 | leaf = path->nodes[0]; |
1295 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1296 | slot = path->slots[0]; |
1297 | } else { | |
1298 | slot++; | |
1299 | path->slots[0]++; | |
1300 | } | |
1301 | } | |
1302 | advance = 1; | |
5f39d397 CM |
1303 | item = btrfs_item_nr(leaf, slot); |
1304 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1305 | ||
1306 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1307 | break; |
5f39d397 | 1308 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1309 | break; |
5f39d397 | 1310 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1311 | continue; |
5f39d397 CM |
1312 | |
1313 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1314 | advance = 1; |
1315 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1316 | di_cur = 0; | |
5f39d397 | 1317 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1318 | while(di_cur < di_total) { |
5f39d397 CM |
1319 | struct btrfs_key location; |
1320 | ||
1321 | name_len = btrfs_dir_name_len(leaf, di); | |
1322 | if (name_len < 32) { | |
1323 | name_ptr = tmp_name; | |
1324 | } else { | |
1325 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1326 | BUG_ON(!name_ptr); | |
1327 | } | |
1328 | read_extent_buffer(leaf, name_ptr, | |
1329 | (unsigned long)(di + 1), name_len); | |
1330 | ||
1331 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1332 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1333 | ||
1334 | over = filldir(dirent, name_ptr, name_len, | |
1335 | found_key.offset, | |
1336 | location.objectid, | |
39279cc3 | 1337 | d_type); |
5f39d397 CM |
1338 | |
1339 | if (name_ptr != tmp_name) | |
1340 | kfree(name_ptr); | |
1341 | ||
39279cc3 CM |
1342 | if (over) |
1343 | goto nopos; | |
5103e947 JB |
1344 | di_len = btrfs_dir_name_len(leaf, di) + |
1345 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1346 | di_cur += di_len; |
1347 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1348 | } | |
1349 | } | |
1350 | filp->f_pos++; | |
1351 | nopos: | |
1352 | ret = 0; | |
1353 | err: | |
1354 | btrfs_release_path(root, path); | |
1355 | btrfs_free_path(path); | |
1356 | mutex_unlock(&root->fs_info->fs_mutex); | |
1357 | return ret; | |
1358 | } | |
1359 | ||
1360 | int btrfs_write_inode(struct inode *inode, int wait) | |
1361 | { | |
1362 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1363 | struct btrfs_trans_handle *trans; | |
1364 | int ret = 0; | |
1365 | ||
1366 | if (wait) { | |
1367 | mutex_lock(&root->fs_info->fs_mutex); | |
1368 | trans = btrfs_start_transaction(root, 1); | |
1369 | btrfs_set_trans_block_group(trans, inode); | |
1370 | ret = btrfs_commit_transaction(trans, root); | |
1371 | mutex_unlock(&root->fs_info->fs_mutex); | |
1372 | } | |
1373 | return ret; | |
1374 | } | |
1375 | ||
1376 | /* | |
54aa1f4d | 1377 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1378 | * inode changes. But, it is most likely to find the inode in cache. |
1379 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1380 | * to keep or drop this code. | |
1381 | */ | |
1382 | void btrfs_dirty_inode(struct inode *inode) | |
1383 | { | |
1384 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1385 | struct btrfs_trans_handle *trans; | |
1386 | ||
1387 | mutex_lock(&root->fs_info->fs_mutex); | |
1388 | trans = btrfs_start_transaction(root, 1); | |
1389 | btrfs_set_trans_block_group(trans, inode); | |
1390 | btrfs_update_inode(trans, root, inode); | |
1391 | btrfs_end_transaction(trans, root); | |
1392 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1393 | } |
1394 | ||
1395 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1396 | struct btrfs_root *root, | |
1397 | u64 objectid, | |
1398 | struct btrfs_block_group_cache *group, | |
1399 | int mode) | |
1400 | { | |
1401 | struct inode *inode; | |
5f39d397 | 1402 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1403 | struct btrfs_key *location; |
5f39d397 | 1404 | struct btrfs_path *path; |
39279cc3 CM |
1405 | int ret; |
1406 | int owner; | |
1407 | ||
5f39d397 CM |
1408 | path = btrfs_alloc_path(); |
1409 | BUG_ON(!path); | |
1410 | ||
39279cc3 CM |
1411 | inode = new_inode(root->fs_info->sb); |
1412 | if (!inode) | |
1413 | return ERR_PTR(-ENOMEM); | |
1414 | ||
b888db2b CM |
1415 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1416 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1417 | BTRFS_I(inode)->root = root; |
b888db2b | 1418 | |
39279cc3 CM |
1419 | if (mode & S_IFDIR) |
1420 | owner = 0; | |
1421 | else | |
1422 | owner = 1; | |
1423 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1424 | BTRFS_I(inode)->block_group = group; | |
1425 | ||
5f39d397 CM |
1426 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1427 | if (ret) | |
1428 | goto fail; | |
1429 | ||
39279cc3 CM |
1430 | inode->i_uid = current->fsuid; |
1431 | inode->i_gid = current->fsgid; | |
1432 | inode->i_mode = mode; | |
1433 | inode->i_ino = objectid; | |
1434 | inode->i_blocks = 0; | |
1435 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1436 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1437 | struct btrfs_inode_item); | |
1438 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1439 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1440 | btrfs_free_path(path); | |
1441 | ||
39279cc3 CM |
1442 | location = &BTRFS_I(inode)->location; |
1443 | location->objectid = objectid; | |
39279cc3 CM |
1444 | location->offset = 0; |
1445 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1446 | ||
39279cc3 CM |
1447 | insert_inode_hash(inode); |
1448 | return inode; | |
5f39d397 CM |
1449 | fail: |
1450 | btrfs_free_path(path); | |
1451 | return ERR_PTR(ret); | |
39279cc3 CM |
1452 | } |
1453 | ||
1454 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1455 | { | |
1456 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1457 | } | |
1458 | ||
1459 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1460 | struct dentry *dentry, struct inode *inode) | |
1461 | { | |
1462 | int ret; | |
1463 | struct btrfs_key key; | |
1464 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1465 | struct inode *parent_inode; |
5f39d397 | 1466 | |
39279cc3 | 1467 | key.objectid = inode->i_ino; |
39279cc3 CM |
1468 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1469 | key.offset = 0; | |
1470 | ||
1471 | ret = btrfs_insert_dir_item(trans, root, | |
1472 | dentry->d_name.name, dentry->d_name.len, | |
1473 | dentry->d_parent->d_inode->i_ino, | |
1474 | &key, btrfs_inode_type(inode)); | |
1475 | if (ret == 0) { | |
76fea00a CM |
1476 | ret = btrfs_insert_inode_ref(trans, root, |
1477 | dentry->d_name.name, | |
1478 | dentry->d_name.len, | |
1479 | inode->i_ino, | |
1480 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1481 | parent_inode = dentry->d_parent->d_inode; |
1482 | parent_inode->i_size += dentry->d_name.len * 2; | |
1483 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1484 | ret = btrfs_update_inode(trans, root, |
1485 | dentry->d_parent->d_inode); | |
1486 | } | |
1487 | return ret; | |
1488 | } | |
1489 | ||
1490 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1491 | struct dentry *dentry, struct inode *inode) | |
1492 | { | |
1493 | int err = btrfs_add_link(trans, dentry, inode); | |
1494 | if (!err) { | |
1495 | d_instantiate(dentry, inode); | |
1496 | return 0; | |
1497 | } | |
1498 | if (err > 0) | |
1499 | err = -EEXIST; | |
1500 | return err; | |
1501 | } | |
1502 | ||
618e21d5 JB |
1503 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1504 | int mode, dev_t rdev) | |
1505 | { | |
1506 | struct btrfs_trans_handle *trans; | |
1507 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1508 | struct inode *inode = NULL; |
618e21d5 JB |
1509 | int err; |
1510 | int drop_inode = 0; | |
1511 | u64 objectid; | |
1832a6d5 | 1512 | unsigned long nr = 0; |
618e21d5 JB |
1513 | |
1514 | if (!new_valid_dev(rdev)) | |
1515 | return -EINVAL; | |
1516 | ||
1517 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1518 | err = btrfs_check_free_space(root, 1, 0); |
1519 | if (err) | |
1520 | goto fail; | |
1521 | ||
618e21d5 JB |
1522 | trans = btrfs_start_transaction(root, 1); |
1523 | btrfs_set_trans_block_group(trans, dir); | |
1524 | ||
1525 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1526 | if (err) { | |
1527 | err = -ENOSPC; | |
1528 | goto out_unlock; | |
1529 | } | |
1530 | ||
1531 | inode = btrfs_new_inode(trans, root, objectid, | |
1532 | BTRFS_I(dir)->block_group, mode); | |
1533 | err = PTR_ERR(inode); | |
1534 | if (IS_ERR(inode)) | |
1535 | goto out_unlock; | |
1536 | ||
1537 | btrfs_set_trans_block_group(trans, inode); | |
1538 | err = btrfs_add_nondir(trans, dentry, inode); | |
1539 | if (err) | |
1540 | drop_inode = 1; | |
1541 | else { | |
1542 | inode->i_op = &btrfs_special_inode_operations; | |
1543 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1544 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1545 | } |
1546 | dir->i_sb->s_dirt = 1; | |
1547 | btrfs_update_inode_block_group(trans, inode); | |
1548 | btrfs_update_inode_block_group(trans, dir); | |
1549 | out_unlock: | |
d3c2fdcf | 1550 | nr = trans->blocks_used; |
618e21d5 | 1551 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1552 | fail: |
618e21d5 JB |
1553 | mutex_unlock(&root->fs_info->fs_mutex); |
1554 | ||
1555 | if (drop_inode) { | |
1556 | inode_dec_link_count(inode); | |
1557 | iput(inode); | |
1558 | } | |
d3c2fdcf | 1559 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1560 | return err; |
1561 | } | |
1562 | ||
39279cc3 CM |
1563 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1564 | int mode, struct nameidata *nd) | |
1565 | { | |
1566 | struct btrfs_trans_handle *trans; | |
1567 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1568 | struct inode *inode = NULL; |
39279cc3 CM |
1569 | int err; |
1570 | int drop_inode = 0; | |
1832a6d5 | 1571 | unsigned long nr = 0; |
39279cc3 CM |
1572 | u64 objectid; |
1573 | ||
1574 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1575 | err = btrfs_check_free_space(root, 1, 0); |
1576 | if (err) | |
1577 | goto fail; | |
39279cc3 CM |
1578 | trans = btrfs_start_transaction(root, 1); |
1579 | btrfs_set_trans_block_group(trans, dir); | |
1580 | ||
1581 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1582 | if (err) { | |
1583 | err = -ENOSPC; | |
1584 | goto out_unlock; | |
1585 | } | |
1586 | ||
1587 | inode = btrfs_new_inode(trans, root, objectid, | |
1588 | BTRFS_I(dir)->block_group, mode); | |
1589 | err = PTR_ERR(inode); | |
1590 | if (IS_ERR(inode)) | |
1591 | goto out_unlock; | |
1592 | ||
1593 | btrfs_set_trans_block_group(trans, inode); | |
1594 | err = btrfs_add_nondir(trans, dentry, inode); | |
1595 | if (err) | |
1596 | drop_inode = 1; | |
1597 | else { | |
1598 | inode->i_mapping->a_ops = &btrfs_aops; | |
1599 | inode->i_fop = &btrfs_file_operations; | |
1600 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1601 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1602 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1603 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1604 | } |
1605 | dir->i_sb->s_dirt = 1; | |
1606 | btrfs_update_inode_block_group(trans, inode); | |
1607 | btrfs_update_inode_block_group(trans, dir); | |
1608 | out_unlock: | |
d3c2fdcf | 1609 | nr = trans->blocks_used; |
39279cc3 | 1610 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1611 | fail: |
39279cc3 CM |
1612 | mutex_unlock(&root->fs_info->fs_mutex); |
1613 | ||
1614 | if (drop_inode) { | |
1615 | inode_dec_link_count(inode); | |
1616 | iput(inode); | |
1617 | } | |
d3c2fdcf | 1618 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1619 | return err; |
1620 | } | |
1621 | ||
1622 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1623 | struct dentry *dentry) | |
1624 | { | |
1625 | struct btrfs_trans_handle *trans; | |
1626 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1627 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1628 | unsigned long nr = 0; |
39279cc3 CM |
1629 | int err; |
1630 | int drop_inode = 0; | |
1631 | ||
1632 | if (inode->i_nlink == 0) | |
1633 | return -ENOENT; | |
1634 | ||
6da6abae CM |
1635 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1636 | inode->i_nlink++; | |
1637 | #else | |
39279cc3 | 1638 | inc_nlink(inode); |
6da6abae | 1639 | #endif |
39279cc3 | 1640 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1641 | err = btrfs_check_free_space(root, 1, 0); |
1642 | if (err) | |
1643 | goto fail; | |
39279cc3 | 1644 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1645 | |
39279cc3 CM |
1646 | btrfs_set_trans_block_group(trans, dir); |
1647 | atomic_inc(&inode->i_count); | |
1648 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1649 | |
39279cc3 CM |
1650 | if (err) |
1651 | drop_inode = 1; | |
5f39d397 | 1652 | |
39279cc3 CM |
1653 | dir->i_sb->s_dirt = 1; |
1654 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1655 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1656 | |
54aa1f4d CM |
1657 | if (err) |
1658 | drop_inode = 1; | |
39279cc3 | 1659 | |
d3c2fdcf | 1660 | nr = trans->blocks_used; |
39279cc3 | 1661 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1662 | fail: |
39279cc3 CM |
1663 | mutex_unlock(&root->fs_info->fs_mutex); |
1664 | ||
1665 | if (drop_inode) { | |
1666 | inode_dec_link_count(inode); | |
1667 | iput(inode); | |
1668 | } | |
d3c2fdcf | 1669 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1670 | return err; |
1671 | } | |
1672 | ||
39279cc3 CM |
1673 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1674 | { | |
1675 | struct inode *inode; | |
1676 | struct btrfs_trans_handle *trans; | |
1677 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1678 | int err = 0; | |
1679 | int drop_on_err = 0; | |
1680 | u64 objectid; | |
d3c2fdcf | 1681 | unsigned long nr = 1; |
39279cc3 CM |
1682 | |
1683 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1684 | err = btrfs_check_free_space(root, 1, 0); |
1685 | if (err) | |
1686 | goto out_unlock; | |
1687 | ||
39279cc3 CM |
1688 | trans = btrfs_start_transaction(root, 1); |
1689 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1690 | |
39279cc3 CM |
1691 | if (IS_ERR(trans)) { |
1692 | err = PTR_ERR(trans); | |
1693 | goto out_unlock; | |
1694 | } | |
1695 | ||
1696 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1697 | if (err) { | |
1698 | err = -ENOSPC; | |
1699 | goto out_unlock; | |
1700 | } | |
1701 | ||
1702 | inode = btrfs_new_inode(trans, root, objectid, | |
1703 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1704 | if (IS_ERR(inode)) { | |
1705 | err = PTR_ERR(inode); | |
1706 | goto out_fail; | |
1707 | } | |
5f39d397 | 1708 | |
39279cc3 CM |
1709 | drop_on_err = 1; |
1710 | inode->i_op = &btrfs_dir_inode_operations; | |
1711 | inode->i_fop = &btrfs_dir_file_operations; | |
1712 | btrfs_set_trans_block_group(trans, inode); | |
1713 | ||
3954401f | 1714 | inode->i_size = 0; |
39279cc3 CM |
1715 | err = btrfs_update_inode(trans, root, inode); |
1716 | if (err) | |
1717 | goto out_fail; | |
5f39d397 | 1718 | |
39279cc3 CM |
1719 | err = btrfs_add_link(trans, dentry, inode); |
1720 | if (err) | |
1721 | goto out_fail; | |
5f39d397 | 1722 | |
39279cc3 CM |
1723 | d_instantiate(dentry, inode); |
1724 | drop_on_err = 0; | |
1725 | dir->i_sb->s_dirt = 1; | |
1726 | btrfs_update_inode_block_group(trans, inode); | |
1727 | btrfs_update_inode_block_group(trans, dir); | |
1728 | ||
1729 | out_fail: | |
d3c2fdcf | 1730 | nr = trans->blocks_used; |
39279cc3 | 1731 | btrfs_end_transaction(trans, root); |
5f39d397 | 1732 | |
39279cc3 CM |
1733 | out_unlock: |
1734 | mutex_unlock(&root->fs_info->fs_mutex); | |
1735 | if (drop_on_err) | |
1736 | iput(inode); | |
d3c2fdcf | 1737 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1738 | return err; |
1739 | } | |
1740 | ||
a52d9a80 CM |
1741 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1742 | size_t page_offset, u64 start, u64 end, | |
1743 | int create) | |
1744 | { | |
1745 | int ret; | |
1746 | int err = 0; | |
db94535d | 1747 | u64 bytenr; |
a52d9a80 CM |
1748 | u64 extent_start = 0; |
1749 | u64 extent_end = 0; | |
1750 | u64 objectid = inode->i_ino; | |
1751 | u32 found_type; | |
1752 | int failed_insert = 0; | |
1753 | struct btrfs_path *path; | |
1754 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1755 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1756 | struct extent_buffer *leaf; |
1757 | struct btrfs_key found_key; | |
a52d9a80 CM |
1758 | struct extent_map *em = NULL; |
1759 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1760 | struct btrfs_trans_handle *trans = NULL; | |
1761 | ||
1762 | path = btrfs_alloc_path(); | |
1763 | BUG_ON(!path); | |
1764 | mutex_lock(&root->fs_info->fs_mutex); | |
1765 | ||
1766 | again: | |
1767 | em = lookup_extent_mapping(em_tree, start, end); | |
1768 | if (em) { | |
1769 | goto out; | |
1770 | } | |
1771 | if (!em) { | |
1772 | em = alloc_extent_map(GFP_NOFS); | |
1773 | if (!em) { | |
1774 | err = -ENOMEM; | |
1775 | goto out; | |
1776 | } | |
5f39d397 CM |
1777 | em->start = EXTENT_MAP_HOLE; |
1778 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1779 | } |
1780 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1781 | ret = btrfs_lookup_file_extent(trans, root, path, |
1782 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1783 | if (ret < 0) { |
1784 | err = ret; | |
1785 | goto out; | |
1786 | } | |
1787 | ||
1788 | if (ret != 0) { | |
1789 | if (path->slots[0] == 0) | |
1790 | goto not_found; | |
1791 | path->slots[0]--; | |
1792 | } | |
1793 | ||
5f39d397 CM |
1794 | leaf = path->nodes[0]; |
1795 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1796 | struct btrfs_file_extent_item); |
a52d9a80 | 1797 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1798 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1799 | found_type = btrfs_key_type(&found_key); | |
1800 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1801 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1802 | goto not_found; | |
1803 | } | |
1804 | ||
5f39d397 CM |
1805 | found_type = btrfs_file_extent_type(leaf, item); |
1806 | extent_start = found_key.offset; | |
a52d9a80 CM |
1807 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1808 | extent_end = extent_start + | |
db94535d | 1809 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1810 | err = 0; |
b888db2b | 1811 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1812 | em->start = start; |
1813 | if (start < extent_start) { | |
b888db2b CM |
1814 | if (end < extent_start) |
1815 | goto not_found; | |
a52d9a80 CM |
1816 | em->end = extent_end - 1; |
1817 | } else { | |
1818 | em->end = end; | |
1819 | } | |
1820 | goto not_found_em; | |
1821 | } | |
db94535d CM |
1822 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1823 | if (bytenr == 0) { | |
a52d9a80 CM |
1824 | em->start = extent_start; |
1825 | em->end = extent_end - 1; | |
5f39d397 CM |
1826 | em->block_start = EXTENT_MAP_HOLE; |
1827 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1828 | goto insert; |
1829 | } | |
db94535d CM |
1830 | bytenr += btrfs_file_extent_offset(leaf, item); |
1831 | em->block_start = bytenr; | |
a52d9a80 | 1832 | em->block_end = em->block_start + |
db94535d | 1833 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1834 | em->start = extent_start; |
1835 | em->end = extent_end - 1; | |
1836 | goto insert; | |
1837 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1838 | unsigned long ptr; |
a52d9a80 | 1839 | char *map; |
3326d1b0 CM |
1840 | size_t size; |
1841 | size_t extent_offset; | |
1842 | size_t copy_size; | |
a52d9a80 | 1843 | |
5f39d397 CM |
1844 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1845 | path->slots[0])); | |
689f9346 | 1846 | extent_end = (extent_start + size - 1) | |
db94535d | 1847 | ((u64)root->sectorsize - 1); |
b888db2b | 1848 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1849 | em->start = start; |
1850 | if (start < extent_start) { | |
b888db2b CM |
1851 | if (end < extent_start) |
1852 | goto not_found; | |
50b78c24 | 1853 | em->end = extent_end; |
a52d9a80 CM |
1854 | } else { |
1855 | em->end = end; | |
1856 | } | |
1857 | goto not_found_em; | |
1858 | } | |
689f9346 Y |
1859 | em->block_start = EXTENT_MAP_INLINE; |
1860 | em->block_end = EXTENT_MAP_INLINE; | |
1861 | ||
1862 | if (!page) { | |
1863 | em->start = extent_start; | |
1864 | em->end = extent_start + size - 1; | |
1865 | goto out; | |
1866 | } | |
5f39d397 | 1867 | |
35ebb934 | 1868 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1869 | extent_start + page_offset; |
ae2f5411 | 1870 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1871 | size - extent_offset); |
3326d1b0 CM |
1872 | em->start = extent_start + extent_offset; |
1873 | em->end = (em->start + copy_size -1) | | |
1874 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1875 | map = kmap(page); |
1876 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1877 | if (create == 0 && !PageUptodate(page)) { |
1878 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1879 | copy_size); | |
1880 | flush_dcache_page(page); | |
1881 | } else if (create && PageUptodate(page)) { | |
1882 | if (!trans) { | |
1883 | kunmap(page); | |
1884 | free_extent_map(em); | |
1885 | em = NULL; | |
1886 | btrfs_release_path(root, path); | |
1887 | trans = btrfs_start_transaction(root, 1); | |
1888 | goto again; | |
1889 | } | |
1890 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1891 | copy_size); | |
1892 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1893 | } |
a52d9a80 | 1894 | kunmap(page); |
3326d1b0 | 1895 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1896 | goto insert; |
1897 | } else { | |
1898 | printk("unkknown found_type %d\n", found_type); | |
1899 | WARN_ON(1); | |
1900 | } | |
1901 | not_found: | |
1902 | em->start = start; | |
1903 | em->end = end; | |
1904 | not_found_em: | |
5f39d397 CM |
1905 | em->block_start = EXTENT_MAP_HOLE; |
1906 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1907 | insert: |
1908 | btrfs_release_path(root, path); | |
1909 | if (em->start > start || em->end < start) { | |
b888db2b | 1910 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1911 | err = -EIO; |
1912 | goto out; | |
1913 | } | |
1914 | ret = add_extent_mapping(em_tree, em); | |
1915 | if (ret == -EEXIST) { | |
1916 | free_extent_map(em); | |
2bf5a725 | 1917 | em = NULL; |
6da6abae CM |
1918 | if (0 && failed_insert == 1) { |
1919 | btrfs_drop_extent_cache(inode, start, end); | |
1920 | } | |
a52d9a80 CM |
1921 | failed_insert++; |
1922 | if (failed_insert > 5) { | |
1923 | printk("failing to insert %Lu %Lu\n", start, end); | |
1924 | err = -EIO; | |
1925 | goto out; | |
1926 | } | |
a52d9a80 CM |
1927 | goto again; |
1928 | } | |
1929 | err = 0; | |
1930 | out: | |
1931 | btrfs_free_path(path); | |
1932 | if (trans) { | |
1933 | ret = btrfs_end_transaction(trans, root); | |
1934 | if (!err) | |
1935 | err = ret; | |
1936 | } | |
1937 | mutex_unlock(&root->fs_info->fs_mutex); | |
1938 | if (err) { | |
1939 | free_extent_map(em); | |
1940 | WARN_ON(1); | |
1941 | return ERR_PTR(err); | |
1942 | } | |
1943 | return em; | |
1944 | } | |
1945 | ||
d396c6f5 | 1946 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1947 | { |
d396c6f5 | 1948 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1949 | } |
1950 | ||
1951 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1952 | unsigned from, unsigned to) | |
1953 | { | |
1832a6d5 CM |
1954 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
1955 | int err; | |
1956 | ||
1957 | mutex_lock(&root->fs_info->fs_mutex); | |
1958 | err = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
5d4fb734 | 1959 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1960 | if (err) |
1961 | return -ENOSPC; | |
1962 | ||
a52d9a80 CM |
1963 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1964 | page->mapping->host, page, from, to, | |
1965 | btrfs_get_extent); | |
39279cc3 CM |
1966 | } |
1967 | ||
a52d9a80 | 1968 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1969 | { |
a52d9a80 CM |
1970 | struct extent_map_tree *tree; |
1971 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1972 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1973 | } |
1832a6d5 | 1974 | |
a52d9a80 | 1975 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1976 | { |
a52d9a80 | 1977 | struct extent_map_tree *tree; |
b888db2b CM |
1978 | |
1979 | ||
1980 | if (current->flags & PF_MEMALLOC) { | |
1981 | redirty_page_for_writepage(wbc, page); | |
1982 | unlock_page(page); | |
1983 | return 0; | |
1984 | } | |
a52d9a80 CM |
1985 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1986 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1987 | } |
1988 | ||
b293f02e CM |
1989 | static int btrfs_writepages(struct address_space *mapping, |
1990 | struct writeback_control *wbc) | |
1991 | { | |
1992 | struct extent_map_tree *tree; | |
1993 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1994 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
1995 | } | |
1996 | ||
3ab2fb5a CM |
1997 | static int |
1998 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
1999 | struct list_head *pages, unsigned nr_pages) | |
2000 | { | |
2001 | struct extent_map_tree *tree; | |
2002 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
2003 | return extent_readpages(tree, mapping, pages, nr_pages, | |
2004 | btrfs_get_extent); | |
2005 | } | |
2006 | ||
a52d9a80 | 2007 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 2008 | { |
a52d9a80 CM |
2009 | struct extent_map_tree *tree; |
2010 | int ret; | |
8c2383c3 | 2011 | |
a52d9a80 CM |
2012 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2013 | ret = try_release_extent_mapping(tree, page); | |
2014 | if (ret == 1) { | |
2015 | ClearPagePrivate(page); | |
2016 | set_page_private(page, 0); | |
2017 | page_cache_release(page); | |
39279cc3 | 2018 | } |
a52d9a80 | 2019 | return ret; |
39279cc3 CM |
2020 | } |
2021 | ||
a52d9a80 | 2022 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2023 | { |
a52d9a80 | 2024 | struct extent_map_tree *tree; |
39279cc3 | 2025 | |
a52d9a80 CM |
2026 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2027 | extent_invalidatepage(tree, page, offset); | |
2028 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2029 | } |
2030 | ||
9ebefb18 CM |
2031 | /* |
2032 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2033 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2034 | * be careful to check for EOF conditions here. We set the page up correctly | |
2035 | * for a written page which means we get ENOSPC checking when writing into | |
2036 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2037 | * support these features. | |
2038 | * | |
2039 | * We are not allowed to take the i_mutex here so we have to play games to | |
2040 | * protect against truncate races as the page could now be beyond EOF. Because | |
2041 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2042 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2043 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2044 | * unlock the page. | |
2045 | */ | |
2046 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2047 | { | |
6da6abae | 2048 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2049 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2050 | unsigned long end; |
2051 | loff_t size; | |
1832a6d5 | 2052 | int ret; |
a52d9a80 | 2053 | u64 page_start; |
9ebefb18 | 2054 | |
1832a6d5 CM |
2055 | mutex_lock(&root->fs_info->fs_mutex); |
2056 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
2057 | mutex_lock(&root->fs_info->fs_mutex); | |
2058 | if (ret) | |
2059 | goto out; | |
2060 | ||
2061 | ret = -EINVAL; | |
2062 | ||
011410bd | 2063 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
2064 | lock_page(page); |
2065 | wait_on_page_writeback(page); | |
9ebefb18 | 2066 | size = i_size_read(inode); |
35ebb934 | 2067 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2068 | |
9ebefb18 | 2069 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2070 | (page_start > size)) { |
9ebefb18 CM |
2071 | /* page got truncated out from underneath us */ |
2072 | goto out_unlock; | |
2073 | } | |
2074 | ||
2075 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2076 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2077 | end = size & ~PAGE_CACHE_MASK; |
2078 | else | |
2079 | end = PAGE_CACHE_SIZE; | |
2080 | ||
b888db2b | 2081 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2082 | |
2083 | out_unlock: | |
011410bd | 2084 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 | 2085 | unlock_page(page); |
1832a6d5 | 2086 | out: |
9ebefb18 CM |
2087 | return ret; |
2088 | } | |
2089 | ||
39279cc3 CM |
2090 | static void btrfs_truncate(struct inode *inode) |
2091 | { | |
2092 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2093 | int ret; | |
2094 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2095 | unsigned long nr; |
39279cc3 CM |
2096 | |
2097 | if (!S_ISREG(inode->i_mode)) | |
2098 | return; | |
2099 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2100 | return; | |
2101 | ||
2102 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2103 | ||
2104 | mutex_lock(&root->fs_info->fs_mutex); | |
2105 | trans = btrfs_start_transaction(root, 1); | |
2106 | btrfs_set_trans_block_group(trans, inode); | |
2107 | ||
2108 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
2109 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 2110 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2111 | nr = trans->blocks_used; |
5f39d397 | 2112 | |
39279cc3 CM |
2113 | ret = btrfs_end_transaction(trans, root); |
2114 | BUG_ON(ret); | |
2115 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2116 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2117 | } |
2118 | ||
2119 | int btrfs_commit_write(struct file *file, struct page *page, | |
2120 | unsigned from, unsigned to) | |
2121 | { | |
e9906a98 CM |
2122 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
2123 | struct inode *inode = page->mapping->host; | |
2124 | ||
2125 | btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE); | |
2126 | ||
e9906a98 CM |
2127 | if (pos > inode->i_size) { |
2128 | i_size_write(inode, pos); | |
2129 | mark_inode_dirty(inode); | |
2130 | } | |
2131 | return 0; | |
39279cc3 CM |
2132 | } |
2133 | ||
2134 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
2135 | { | |
2136 | struct btrfs_trans_handle *trans; | |
2137 | struct btrfs_key key; | |
2138 | struct btrfs_root_item root_item; | |
2139 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2140 | struct extent_buffer *leaf; |
39279cc3 CM |
2141 | struct btrfs_root *new_root; |
2142 | struct inode *inode; | |
2143 | struct inode *dir; | |
2144 | int ret; | |
54aa1f4d | 2145 | int err; |
39279cc3 CM |
2146 | u64 objectid; |
2147 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2148 | unsigned long nr = 1; |
39279cc3 CM |
2149 | |
2150 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2151 | ret = btrfs_check_free_space(root, 1, 0); |
2152 | if (ret) | |
2153 | goto fail_commit; | |
2154 | ||
39279cc3 CM |
2155 | trans = btrfs_start_transaction(root, 1); |
2156 | BUG_ON(!trans); | |
2157 | ||
7bb86316 CM |
2158 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2159 | 0, &objectid); | |
2160 | if (ret) | |
2161 | goto fail; | |
2162 | ||
2163 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2164 | objectid, trans->transid, 0, 0, | |
2165 | 0, 0); | |
5f39d397 CM |
2166 | if (IS_ERR(leaf)) |
2167 | return PTR_ERR(leaf); | |
2168 | ||
2169 | btrfs_set_header_nritems(leaf, 0); | |
2170 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2171 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2172 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2173 | btrfs_set_header_owner(leaf, objectid); |
2174 | ||
5f39d397 CM |
2175 | write_extent_buffer(leaf, root->fs_info->fsid, |
2176 | (unsigned long)btrfs_header_fsid(leaf), | |
2177 | BTRFS_FSID_SIZE); | |
2178 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2179 | |
2180 | inode_item = &root_item.inode; | |
2181 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2182 | inode_item->generation = cpu_to_le64(1); |
2183 | inode_item->size = cpu_to_le64(3); | |
2184 | inode_item->nlink = cpu_to_le32(1); | |
2185 | inode_item->nblocks = cpu_to_le64(1); | |
2186 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2187 | |
db94535d CM |
2188 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2189 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2190 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2191 | btrfs_set_root_used(&root_item, 0); |
2192 | ||
5eda7b5e CM |
2193 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2194 | root_item.drop_level = 0; | |
5f39d397 CM |
2195 | |
2196 | free_extent_buffer(leaf); | |
2197 | leaf = NULL; | |
39279cc3 | 2198 | |
39279cc3 CM |
2199 | btrfs_set_root_dirid(&root_item, new_dirid); |
2200 | ||
2201 | key.objectid = objectid; | |
2202 | key.offset = 1; | |
39279cc3 CM |
2203 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2204 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2205 | &root_item); | |
54aa1f4d CM |
2206 | if (ret) |
2207 | goto fail; | |
39279cc3 CM |
2208 | |
2209 | /* | |
2210 | * insert the directory item | |
2211 | */ | |
2212 | key.offset = (u64)-1; | |
2213 | dir = root->fs_info->sb->s_root->d_inode; | |
2214 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2215 | name, namelen, dir->i_ino, &key, | |
2216 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2217 | if (ret) |
2218 | goto fail; | |
39279cc3 | 2219 | |
3954401f CM |
2220 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2221 | name, namelen, objectid, | |
2222 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2223 | if (ret) | |
2224 | goto fail; | |
2225 | ||
39279cc3 | 2226 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2227 | if (ret) |
2228 | goto fail_commit; | |
39279cc3 | 2229 | |
58176a96 | 2230 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2231 | BUG_ON(!new_root); |
2232 | ||
2233 | trans = btrfs_start_transaction(new_root, 1); | |
2234 | BUG_ON(!trans); | |
2235 | ||
2236 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2237 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2238 | if (IS_ERR(inode)) |
2239 | goto fail; | |
39279cc3 CM |
2240 | inode->i_op = &btrfs_dir_inode_operations; |
2241 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2242 | new_root->inode = inode; |
39279cc3 | 2243 | |
3954401f CM |
2244 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2245 | new_dirid); | |
39279cc3 | 2246 | inode->i_nlink = 1; |
3954401f | 2247 | inode->i_size = 0; |
39279cc3 | 2248 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2249 | if (ret) |
2250 | goto fail; | |
2251 | fail: | |
d3c2fdcf | 2252 | nr = trans->blocks_used; |
54aa1f4d CM |
2253 | err = btrfs_commit_transaction(trans, root); |
2254 | if (err && !ret) | |
2255 | ret = err; | |
2256 | fail_commit: | |
39279cc3 | 2257 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2258 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2259 | return ret; |
39279cc3 CM |
2260 | } |
2261 | ||
2262 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2263 | { | |
2264 | struct btrfs_trans_handle *trans; | |
2265 | struct btrfs_key key; | |
2266 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2267 | struct extent_buffer *tmp; |
39279cc3 | 2268 | int ret; |
54aa1f4d | 2269 | int err; |
39279cc3 | 2270 | u64 objectid; |
1832a6d5 | 2271 | unsigned long nr = 0; |
39279cc3 CM |
2272 | |
2273 | if (!root->ref_cows) | |
2274 | return -EINVAL; | |
2275 | ||
011410bd CM |
2276 | down_write(&root->snap_sem); |
2277 | freeze_bdev(root->fs_info->sb->s_bdev); | |
2278 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
2279 | ||
39279cc3 | 2280 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2281 | ret = btrfs_check_free_space(root, 1, 0); |
2282 | if (ret) | |
2283 | goto fail_unlock; | |
2284 | ||
39279cc3 CM |
2285 | trans = btrfs_start_transaction(root, 1); |
2286 | BUG_ON(!trans); | |
2287 | ||
2288 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2289 | if (ret) |
2290 | goto fail; | |
39279cc3 CM |
2291 | |
2292 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2293 | 0, &objectid); | |
54aa1f4d CM |
2294 | if (ret) |
2295 | goto fail; | |
39279cc3 CM |
2296 | |
2297 | memcpy(&new_root_item, &root->root_item, | |
2298 | sizeof(new_root_item)); | |
2299 | ||
2300 | key.objectid = objectid; | |
2301 | key.offset = 1; | |
39279cc3 | 2302 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
be20aa9d | 2303 | |
9691975d | 2304 | extent_buffer_get(root->node); |
83df7c1d | 2305 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2306 | free_extent_buffer(tmp); |
be20aa9d CM |
2307 | |
2308 | btrfs_copy_root(trans, root, root->node, &tmp, objectid); | |
2309 | ||
2310 | btrfs_set_root_bytenr(&new_root_item, tmp->start); | |
2311 | btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp)); | |
39279cc3 CM |
2312 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2313 | &new_root_item); | |
be20aa9d | 2314 | free_extent_buffer(tmp); |
54aa1f4d CM |
2315 | if (ret) |
2316 | goto fail; | |
39279cc3 CM |
2317 | |
2318 | /* | |
2319 | * insert the directory item | |
2320 | */ | |
2321 | key.offset = (u64)-1; | |
2322 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2323 | name, namelen, | |
2324 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2325 | &key, BTRFS_FT_DIR); | |
2326 | ||
54aa1f4d CM |
2327 | if (ret) |
2328 | goto fail; | |
39279cc3 | 2329 | |
3954401f CM |
2330 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2331 | name, namelen, objectid, | |
2332 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2333 | ||
2334 | if (ret) | |
2335 | goto fail; | |
54aa1f4d | 2336 | fail: |
d3c2fdcf | 2337 | nr = trans->blocks_used; |
54aa1f4d | 2338 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2339 | |
54aa1f4d CM |
2340 | if (err && !ret) |
2341 | ret = err; | |
1832a6d5 | 2342 | fail_unlock: |
39279cc3 | 2343 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2344 | up_write(&root->snap_sem); |
d3c2fdcf | 2345 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2346 | return ret; |
39279cc3 CM |
2347 | } |
2348 | ||
86479a04 CM |
2349 | static unsigned long force_ra(struct address_space *mapping, |
2350 | struct file_ra_state *ra, struct file *file, | |
2351 | pgoff_t offset, pgoff_t last_index) | |
2352 | { | |
2353 | pgoff_t req_size; | |
2354 | ||
2355 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2356 | req_size = last_index - offset + 1; | |
2357 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2358 | return offset; | |
2359 | #else | |
2360 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2361 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2362 | return offset + req_size; | |
2363 | #endif | |
2364 | } | |
2365 | ||
2366 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2367 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2368 | struct btrfs_root *root = BTRFS_I(inode)->root; |
86479a04 CM |
2369 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
2370 | struct page *page; | |
2371 | unsigned long last_index; | |
2372 | unsigned long ra_index = 0; | |
2373 | u64 page_start; | |
2374 | u64 page_end; | |
2375 | unsigned long i; | |
1832a6d5 CM |
2376 | int ret; |
2377 | ||
2378 | mutex_lock(&root->fs_info->fs_mutex); | |
2379 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2380 | mutex_unlock(&root->fs_info->fs_mutex); | |
2381 | if (ret) | |
2382 | return -ENOSPC; | |
86479a04 CM |
2383 | |
2384 | mutex_lock(&inode->i_mutex); | |
2385 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2386 | for (i = 0; i <= last_index; i++) { | |
2387 | if (i == ra_index) { | |
2388 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2389 | file, ra_index, last_index); | |
2390 | } | |
2391 | page = grab_cache_page(inode->i_mapping, i); | |
2392 | if (!page) | |
2393 | goto out_unlock; | |
2394 | if (!PageUptodate(page)) { | |
2395 | btrfs_readpage(NULL, page); | |
2396 | lock_page(page); | |
2397 | if (!PageUptodate(page)) { | |
2398 | unlock_page(page); | |
2399 | page_cache_release(page); | |
2400 | goto out_unlock; | |
2401 | } | |
2402 | } | |
35ebb934 | 2403 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2404 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2405 | ||
2406 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2407 | set_extent_delalloc(em_tree, page_start, | |
2408 | page_end, GFP_NOFS); | |
2409 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2410 | set_page_dirty(page); | |
2411 | unlock_page(page); | |
2412 | page_cache_release(page); | |
2413 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2414 | } | |
2415 | ||
2416 | out_unlock: | |
2417 | mutex_unlock(&inode->i_mutex); | |
2418 | return 0; | |
2419 | } | |
2420 | ||
d03581f4 | 2421 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2422 | { |
4aec2b52 | 2423 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2424 | struct btrfs_dir_item *di; |
39279cc3 CM |
2425 | struct btrfs_path *path; |
2426 | u64 root_dirid; | |
4aec2b52 CM |
2427 | int namelen; |
2428 | int ret; | |
39279cc3 | 2429 | |
4aec2b52 | 2430 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2431 | |
4aec2b52 CM |
2432 | if (!vol_args) |
2433 | return -ENOMEM; | |
2434 | ||
2435 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2436 | ret = -EFAULT; | |
2437 | goto out; | |
2438 | } | |
2439 | ||
2440 | namelen = strlen(vol_args->name); | |
2441 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2442 | ret = -EINVAL; | |
2443 | goto out; | |
2444 | } | |
2445 | if (strchr(vol_args->name, '/')) { | |
2446 | ret = -EINVAL; | |
2447 | goto out; | |
2448 | } | |
d03581f4 CH |
2449 | |
2450 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2451 | if (!path) { |
2452 | ret = -ENOMEM; | |
2453 | goto out; | |
2454 | } | |
d03581f4 CH |
2455 | |
2456 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2457 | mutex_lock(&root->fs_info->fs_mutex); | |
2458 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2459 | path, root_dirid, | |
4aec2b52 | 2460 | vol_args->name, namelen, 0); |
d03581f4 CH |
2461 | mutex_unlock(&root->fs_info->fs_mutex); |
2462 | btrfs_free_path(path); | |
4aec2b52 CM |
2463 | |
2464 | if (di && !IS_ERR(di)) { | |
2465 | ret = -EEXIST; | |
2466 | goto out; | |
2467 | } | |
2468 | ||
2469 | if (IS_ERR(di)) { | |
2470 | ret = PTR_ERR(di); | |
2471 | goto out; | |
2472 | } | |
d03581f4 CH |
2473 | |
2474 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2475 | ret = create_subvol(root, vol_args->name, namelen); |
2476 | else | |
2477 | ret = create_snapshot(root, vol_args->name, namelen); | |
2478 | out: | |
2479 | kfree(vol_args); | |
2480 | return ret; | |
d03581f4 CH |
2481 | } |
2482 | ||
2483 | static int btrfs_ioctl_defrag(struct file *file) | |
2484 | { | |
6da6abae | 2485 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2486 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2487 | ||
2488 | switch (inode->i_mode & S_IFMT) { | |
2489 | case S_IFDIR: | |
39279cc3 | 2490 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2491 | btrfs_defrag_root(root, 0); |
2492 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2493 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2494 | break; |
d03581f4 CH |
2495 | case S_IFREG: |
2496 | btrfs_defrag_file(file); | |
2497 | break; | |
2498 | } | |
2499 | ||
2500 | return 0; | |
2501 | } | |
6702ed49 | 2502 | |
d03581f4 CH |
2503 | long btrfs_ioctl(struct file *file, unsigned int |
2504 | cmd, unsigned long arg) | |
2505 | { | |
6da6abae | 2506 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2507 | |
2508 | switch (cmd) { | |
2509 | case BTRFS_IOC_SNAP_CREATE: | |
2510 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2511 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2512 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2513 | } |
d03581f4 CH |
2514 | |
2515 | return -ENOTTY; | |
39279cc3 CM |
2516 | } |
2517 | ||
39279cc3 CM |
2518 | /* |
2519 | * Called inside transaction, so use GFP_NOFS | |
2520 | */ | |
2521 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2522 | { | |
2523 | struct btrfs_inode *ei; | |
2524 | ||
2525 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2526 | if (!ei) | |
2527 | return NULL; | |
15ee9bc7 | 2528 | ei->last_trans = 0; |
39279cc3 CM |
2529 | return &ei->vfs_inode; |
2530 | } | |
2531 | ||
2532 | void btrfs_destroy_inode(struct inode *inode) | |
2533 | { | |
2534 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2535 | WARN_ON(inode->i_data.nrpages); | |
2536 | ||
2537 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2538 | } | |
2539 | ||
44ec0b71 CM |
2540 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2541 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2542 | #else | |
39279cc3 CM |
2543 | static void init_once(void * foo, struct kmem_cache * cachep, |
2544 | unsigned long flags) | |
44ec0b71 | 2545 | #endif |
39279cc3 CM |
2546 | { |
2547 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2548 | ||
2549 | inode_init_once(&ei->vfs_inode); | |
2550 | } | |
2551 | ||
2552 | void btrfs_destroy_cachep(void) | |
2553 | { | |
2554 | if (btrfs_inode_cachep) | |
2555 | kmem_cache_destroy(btrfs_inode_cachep); | |
2556 | if (btrfs_trans_handle_cachep) | |
2557 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2558 | if (btrfs_transaction_cachep) | |
2559 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2560 | if (btrfs_bit_radix_cachep) | |
2561 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2562 | if (btrfs_path_cachep) | |
2563 | kmem_cache_destroy(btrfs_path_cachep); | |
2564 | } | |
2565 | ||
86479a04 | 2566 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2567 | unsigned long extra_flags, |
44ec0b71 CM |
2568 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2569 | void (*ctor)(struct kmem_cache *, void *) | |
2570 | #else | |
92fee66d | 2571 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2572 | unsigned long) |
2573 | #endif | |
2574 | ) | |
92fee66d CM |
2575 | { |
2576 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2577 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2578 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2579 | ,NULL | |
2580 | #endif | |
2581 | ); | |
2582 | } | |
2583 | ||
39279cc3 CM |
2584 | int btrfs_init_cachep(void) |
2585 | { | |
86479a04 | 2586 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2587 | sizeof(struct btrfs_inode), |
2588 | 0, init_once); | |
39279cc3 CM |
2589 | if (!btrfs_inode_cachep) |
2590 | goto fail; | |
86479a04 CM |
2591 | btrfs_trans_handle_cachep = |
2592 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2593 | sizeof(struct btrfs_trans_handle), | |
2594 | 0, NULL); | |
39279cc3 CM |
2595 | if (!btrfs_trans_handle_cachep) |
2596 | goto fail; | |
86479a04 | 2597 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2598 | sizeof(struct btrfs_transaction), |
92fee66d | 2599 | 0, NULL); |
39279cc3 CM |
2600 | if (!btrfs_transaction_cachep) |
2601 | goto fail; | |
86479a04 | 2602 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2603 | sizeof(struct btrfs_path), |
92fee66d | 2604 | 0, NULL); |
39279cc3 CM |
2605 | if (!btrfs_path_cachep) |
2606 | goto fail; | |
86479a04 | 2607 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2608 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2609 | if (!btrfs_bit_radix_cachep) |
2610 | goto fail; | |
2611 | return 0; | |
2612 | fail: | |
2613 | btrfs_destroy_cachep(); | |
2614 | return -ENOMEM; | |
2615 | } | |
2616 | ||
2617 | static int btrfs_getattr(struct vfsmount *mnt, | |
2618 | struct dentry *dentry, struct kstat *stat) | |
2619 | { | |
2620 | struct inode *inode = dentry->d_inode; | |
2621 | generic_fillattr(inode, stat); | |
2622 | stat->blksize = 256 * 1024; | |
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2627 | struct inode * new_dir,struct dentry *new_dentry) | |
2628 | { | |
2629 | struct btrfs_trans_handle *trans; | |
2630 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2631 | struct inode *new_inode = new_dentry->d_inode; | |
2632 | struct inode *old_inode = old_dentry->d_inode; | |
2633 | struct timespec ctime = CURRENT_TIME; | |
2634 | struct btrfs_path *path; | |
39279cc3 CM |
2635 | int ret; |
2636 | ||
2637 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2638 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2639 | return -ENOTEMPTY; | |
2640 | } | |
5f39d397 | 2641 | |
39279cc3 | 2642 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2643 | ret = btrfs_check_free_space(root, 1, 0); |
2644 | if (ret) | |
2645 | goto out_unlock; | |
2646 | ||
39279cc3 | 2647 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2648 | |
39279cc3 CM |
2649 | btrfs_set_trans_block_group(trans, new_dir); |
2650 | path = btrfs_alloc_path(); | |
2651 | if (!path) { | |
2652 | ret = -ENOMEM; | |
2653 | goto out_fail; | |
2654 | } | |
2655 | ||
2656 | old_dentry->d_inode->i_nlink++; | |
2657 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2658 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2659 | old_inode->i_ctime = ctime; | |
5f39d397 | 2660 | |
39279cc3 CM |
2661 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2662 | if (ret) | |
2663 | goto out_fail; | |
2664 | ||
2665 | if (new_inode) { | |
2666 | new_inode->i_ctime = CURRENT_TIME; | |
2667 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2668 | if (ret) | |
2669 | goto out_fail; | |
39279cc3 CM |
2670 | } |
2671 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2672 | if (ret) | |
2673 | goto out_fail; | |
2674 | ||
2675 | out_fail: | |
2676 | btrfs_free_path(path); | |
2677 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2678 | out_unlock: |
39279cc3 CM |
2679 | mutex_unlock(&root->fs_info->fs_mutex); |
2680 | return ret; | |
2681 | } | |
2682 | ||
2683 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2684 | const char *symname) | |
2685 | { | |
2686 | struct btrfs_trans_handle *trans; | |
2687 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2688 | struct btrfs_path *path; | |
2689 | struct btrfs_key key; | |
1832a6d5 | 2690 | struct inode *inode = NULL; |
39279cc3 CM |
2691 | int err; |
2692 | int drop_inode = 0; | |
2693 | u64 objectid; | |
2694 | int name_len; | |
2695 | int datasize; | |
5f39d397 | 2696 | unsigned long ptr; |
39279cc3 | 2697 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2698 | struct extent_buffer *leaf; |
1832a6d5 | 2699 | unsigned long nr = 0; |
39279cc3 CM |
2700 | |
2701 | name_len = strlen(symname) + 1; | |
2702 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2703 | return -ENAMETOOLONG; | |
1832a6d5 | 2704 | |
39279cc3 | 2705 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2706 | err = btrfs_check_free_space(root, 1, 0); |
2707 | if (err) | |
2708 | goto out_fail; | |
2709 | ||
39279cc3 CM |
2710 | trans = btrfs_start_transaction(root, 1); |
2711 | btrfs_set_trans_block_group(trans, dir); | |
2712 | ||
2713 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2714 | if (err) { | |
2715 | err = -ENOSPC; | |
2716 | goto out_unlock; | |
2717 | } | |
2718 | ||
2719 | inode = btrfs_new_inode(trans, root, objectid, | |
2720 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2721 | err = PTR_ERR(inode); | |
2722 | if (IS_ERR(inode)) | |
2723 | goto out_unlock; | |
2724 | ||
2725 | btrfs_set_trans_block_group(trans, inode); | |
2726 | err = btrfs_add_nondir(trans, dentry, inode); | |
2727 | if (err) | |
2728 | drop_inode = 1; | |
2729 | else { | |
2730 | inode->i_mapping->a_ops = &btrfs_aops; | |
2731 | inode->i_fop = &btrfs_file_operations; | |
2732 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2733 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2734 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2735 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2736 | } |
2737 | dir->i_sb->s_dirt = 1; | |
2738 | btrfs_update_inode_block_group(trans, inode); | |
2739 | btrfs_update_inode_block_group(trans, dir); | |
2740 | if (drop_inode) | |
2741 | goto out_unlock; | |
2742 | ||
2743 | path = btrfs_alloc_path(); | |
2744 | BUG_ON(!path); | |
2745 | key.objectid = inode->i_ino; | |
2746 | key.offset = 0; | |
39279cc3 CM |
2747 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2748 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2749 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2750 | datasize); | |
54aa1f4d CM |
2751 | if (err) { |
2752 | drop_inode = 1; | |
2753 | goto out_unlock; | |
2754 | } | |
5f39d397 CM |
2755 | leaf = path->nodes[0]; |
2756 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2757 | struct btrfs_file_extent_item); | |
2758 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2759 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2760 | BTRFS_FILE_EXTENT_INLINE); |
2761 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2762 | write_extent_buffer(leaf, symname, ptr, name_len); |
2763 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2764 | btrfs_free_path(path); |
5f39d397 | 2765 | |
39279cc3 CM |
2766 | inode->i_op = &btrfs_symlink_inode_operations; |
2767 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2768 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2769 | err = btrfs_update_inode(trans, root, inode); |
2770 | if (err) | |
2771 | drop_inode = 1; | |
39279cc3 CM |
2772 | |
2773 | out_unlock: | |
d3c2fdcf | 2774 | nr = trans->blocks_used; |
39279cc3 | 2775 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2776 | out_fail: |
39279cc3 | 2777 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2778 | if (drop_inode) { |
2779 | inode_dec_link_count(inode); | |
2780 | iput(inode); | |
2781 | } | |
d3c2fdcf | 2782 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2783 | return err; |
2784 | } | |
2785 | ||
2786 | static struct inode_operations btrfs_dir_inode_operations = { | |
2787 | .lookup = btrfs_lookup, | |
2788 | .create = btrfs_create, | |
2789 | .unlink = btrfs_unlink, | |
2790 | .link = btrfs_link, | |
2791 | .mkdir = btrfs_mkdir, | |
2792 | .rmdir = btrfs_rmdir, | |
2793 | .rename = btrfs_rename, | |
2794 | .symlink = btrfs_symlink, | |
2795 | .setattr = btrfs_setattr, | |
618e21d5 | 2796 | .mknod = btrfs_mknod, |
5103e947 JB |
2797 | .setxattr = generic_setxattr, |
2798 | .getxattr = generic_getxattr, | |
2799 | .listxattr = btrfs_listxattr, | |
2800 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2801 | }; |
2802 | ||
2803 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2804 | .lookup = btrfs_lookup, | |
2805 | }; | |
2806 | ||
2807 | static struct file_operations btrfs_dir_file_operations = { | |
2808 | .llseek = generic_file_llseek, | |
2809 | .read = generic_read_dir, | |
2810 | .readdir = btrfs_readdir, | |
34287aa3 | 2811 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2812 | #ifdef CONFIG_COMPAT |
34287aa3 | 2813 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2814 | #endif |
2815 | }; | |
2816 | ||
07157aac CM |
2817 | static struct extent_map_ops btrfs_extent_map_ops = { |
2818 | .fill_delalloc = run_delalloc_range, | |
2819 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2820 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2821 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2822 | }; | |
2823 | ||
39279cc3 CM |
2824 | static struct address_space_operations btrfs_aops = { |
2825 | .readpage = btrfs_readpage, | |
2826 | .writepage = btrfs_writepage, | |
b293f02e | 2827 | .writepages = btrfs_writepages, |
3ab2fb5a | 2828 | .readpages = btrfs_readpages, |
39279cc3 CM |
2829 | .sync_page = block_sync_page, |
2830 | .prepare_write = btrfs_prepare_write, | |
2831 | .commit_write = btrfs_commit_write, | |
2832 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2833 | .invalidatepage = btrfs_invalidatepage, |
2834 | .releasepage = btrfs_releasepage, | |
2835 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2836 | }; |
2837 | ||
2838 | static struct address_space_operations btrfs_symlink_aops = { | |
2839 | .readpage = btrfs_readpage, | |
2840 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2841 | .invalidatepage = btrfs_invalidatepage, |
2842 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2843 | }; |
2844 | ||
2845 | static struct inode_operations btrfs_file_inode_operations = { | |
2846 | .truncate = btrfs_truncate, | |
2847 | .getattr = btrfs_getattr, | |
2848 | .setattr = btrfs_setattr, | |
5103e947 JB |
2849 | .setxattr = generic_setxattr, |
2850 | .getxattr = generic_getxattr, | |
2851 | .listxattr = btrfs_listxattr, | |
2852 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2853 | }; |
2854 | ||
618e21d5 JB |
2855 | static struct inode_operations btrfs_special_inode_operations = { |
2856 | .getattr = btrfs_getattr, | |
2857 | .setattr = btrfs_setattr, | |
2858 | }; | |
2859 | ||
39279cc3 CM |
2860 | static struct inode_operations btrfs_symlink_inode_operations = { |
2861 | .readlink = generic_readlink, | |
2862 | .follow_link = page_follow_link_light, | |
2863 | .put_link = page_put_link, | |
2864 | }; |