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Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 56 | static struct extent_io_ops btrfs_extent_io_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 | ||
9cce6c3b CM |
83 | return 0; |
84 | ||
1832a6d5 | 85 | if (for_del) |
f9ef6604 | 86 | thresh = total * 90; |
1832a6d5 | 87 | else |
f9ef6604 CM |
88 | thresh = total * 85; |
89 | ||
90 | do_div(thresh, 100); | |
1832a6d5 CM |
91 | |
92 | spin_lock(&root->fs_info->delalloc_lock); | |
93 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
94 | ret = -ENOSPC; | |
95 | spin_unlock(&root->fs_info->delalloc_lock); | |
96 | return ret; | |
97 | } | |
98 | ||
be20aa9d | 99 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
100 | { |
101 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
102 | struct btrfs_trans_handle *trans; | |
b888db2b | 103 | u64 alloc_hint = 0; |
db94535d | 104 | u64 num_bytes; |
c59f8951 | 105 | u64 cur_alloc_size; |
db94535d | 106 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
107 | u64 orig_start = start; |
108 | u64 orig_num_bytes; | |
be20aa9d CM |
109 | struct btrfs_key ins; |
110 | int ret; | |
b888db2b | 111 | |
b888db2b | 112 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 113 | BUG_ON(!trans); |
be20aa9d CM |
114 | btrfs_set_trans_block_group(trans, inode); |
115 | ||
db94535d | 116 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 117 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 118 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 119 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 120 | orig_num_bytes = num_bytes; |
db94535d | 121 | |
179e29e4 CM |
122 | if (alloc_hint == EXTENT_MAP_INLINE) |
123 | goto out; | |
124 | ||
c59f8951 CM |
125 | while(num_bytes > 0) { |
126 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
127 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
128 | root->root_key.objectid, | |
129 | trans->transid, | |
130 | inode->i_ino, start, 0, | |
131 | alloc_hint, (u64)-1, &ins, 1); | |
132 | if (ret) { | |
133 | WARN_ON(1); | |
134 | goto out; | |
135 | } | |
136 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
137 | start, ins.objectid, ins.offset, | |
138 | ins.offset); | |
5f56406a | 139 | btrfs_check_file(root, inode); |
c59f8951 CM |
140 | num_bytes -= cur_alloc_size; |
141 | alloc_hint = ins.objectid + ins.offset; | |
142 | start += cur_alloc_size; | |
b888db2b | 143 | } |
d1310b2e CM |
144 | btrfs_drop_extent_cache(inode, orig_start, |
145 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 146 | btrfs_add_ordered_inode(inode); |
b888db2b CM |
147 | out: |
148 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
149 | return ret; |
150 | } | |
151 | ||
152 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
153 | { | |
154 | u64 extent_start; | |
155 | u64 extent_end; | |
156 | u64 bytenr; | |
157 | u64 cow_end; | |
1832a6d5 | 158 | u64 loops = 0; |
c31f8830 | 159 | u64 total_fs_bytes; |
be20aa9d CM |
160 | struct btrfs_root *root = BTRFS_I(inode)->root; |
161 | struct extent_buffer *leaf; | |
162 | int found_type; | |
163 | struct btrfs_path *path; | |
164 | struct btrfs_file_extent_item *item; | |
165 | int ret; | |
166 | int err; | |
167 | struct btrfs_key found_key; | |
168 | ||
c31f8830 | 169 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
170 | path = btrfs_alloc_path(); |
171 | BUG_ON(!path); | |
172 | again: | |
173 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
174 | inode->i_ino, start, 0); | |
175 | if (ret < 0) { | |
176 | btrfs_free_path(path); | |
177 | return ret; | |
178 | } | |
179 | ||
180 | cow_end = end; | |
181 | if (ret != 0) { | |
182 | if (path->slots[0] == 0) | |
183 | goto not_found; | |
184 | path->slots[0]--; | |
185 | } | |
186 | ||
187 | leaf = path->nodes[0]; | |
188 | item = btrfs_item_ptr(leaf, path->slots[0], | |
189 | struct btrfs_file_extent_item); | |
190 | ||
191 | /* are we inside the extent that was found? */ | |
192 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
193 | found_type = btrfs_key_type(&found_key); | |
194 | if (found_key.objectid != inode->i_ino || | |
195 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
196 | goto not_found; | |
197 | } | |
198 | ||
199 | found_type = btrfs_file_extent_type(leaf, item); | |
200 | extent_start = found_key.offset; | |
201 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
202 | u64 extent_num_bytes; |
203 | ||
204 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
205 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
206 | err = 0; |
207 | ||
1832a6d5 CM |
208 | if (loops && start != extent_start) |
209 | goto not_found; | |
210 | ||
be20aa9d CM |
211 | if (start < extent_start || start >= extent_end) |
212 | goto not_found; | |
213 | ||
214 | cow_end = min(end, extent_end - 1); | |
215 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
216 | if (bytenr == 0) | |
217 | goto not_found; | |
218 | ||
c31f8830 CM |
219 | /* |
220 | * we may be called by the resizer, make sure we're inside | |
221 | * the limits of the FS | |
222 | */ | |
223 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
224 | goto not_found; | |
225 | ||
be20aa9d CM |
226 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
227 | goto not_found; | |
228 | } | |
229 | ||
230 | start = extent_end; | |
bd09835d | 231 | } else { |
be20aa9d CM |
232 | goto not_found; |
233 | } | |
234 | loop: | |
235 | if (start > end) { | |
236 | btrfs_free_path(path); | |
237 | return 0; | |
238 | } | |
239 | btrfs_release_path(root, path); | |
1832a6d5 | 240 | loops++; |
be20aa9d CM |
241 | goto again; |
242 | ||
243 | not_found: | |
244 | cow_file_range(inode, start, cow_end); | |
245 | start = cow_end + 1; | |
246 | goto loop; | |
247 | } | |
248 | ||
249 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
250 | { | |
251 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1832a6d5 | 252 | u64 num_bytes; |
be20aa9d | 253 | int ret; |
be20aa9d | 254 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
255 | if (btrfs_test_opt(root, NODATACOW) || |
256 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
257 | ret = run_delalloc_nocow(inode, start, end); |
258 | else | |
259 | ret = cow_file_range(inode, start, end); | |
1832a6d5 CM |
260 | |
261 | spin_lock(&root->fs_info->delalloc_lock); | |
262 | num_bytes = end + 1 - start; | |
263 | if (root->fs_info->delalloc_bytes < num_bytes) { | |
264 | printk("delalloc accounting error total %llu sub %llu\n", | |
265 | root->fs_info->delalloc_bytes, num_bytes); | |
266 | } else { | |
267 | root->fs_info->delalloc_bytes -= num_bytes; | |
268 | } | |
269 | spin_unlock(&root->fs_info->delalloc_lock); | |
270 | ||
b888db2b CM |
271 | mutex_unlock(&root->fs_info->fs_mutex); |
272 | return ret; | |
273 | } | |
274 | ||
07157aac CM |
275 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
276 | { | |
277 | struct inode *inode = page->mapping->host; | |
278 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
279 | struct btrfs_trans_handle *trans; | |
280 | char *kaddr; | |
b6cda9bc | 281 | int ret = 0; |
35ebb934 | 282 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac | 283 | size_t offset = start - page_start; |
b98b6767 Y |
284 | if (btrfs_test_opt(root, NODATASUM) || |
285 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 286 | return 0; |
07157aac CM |
287 | mutex_lock(&root->fs_info->fs_mutex); |
288 | trans = btrfs_start_transaction(root, 1); | |
289 | btrfs_set_trans_block_group(trans, inode); | |
290 | kaddr = kmap(page); | |
f578d4bd | 291 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
292 | start, kaddr + offset, end - start + 1); |
293 | kunmap(page); | |
294 | ret = btrfs_end_transaction(trans, root); | |
295 | BUG_ON(ret); | |
296 | mutex_unlock(&root->fs_info->fs_mutex); | |
297 | return ret; | |
298 | } | |
299 | ||
300 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
301 | { | |
302 | int ret = 0; | |
303 | struct inode *inode = page->mapping->host; | |
304 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 305 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
306 | struct btrfs_csum_item *item; |
307 | struct btrfs_path *path = NULL; | |
ff79f819 | 308 | u32 csum; |
b98b6767 Y |
309 | if (btrfs_test_opt(root, NODATASUM) || |
310 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 311 | return 0; |
07157aac CM |
312 | mutex_lock(&root->fs_info->fs_mutex); |
313 | path = btrfs_alloc_path(); | |
314 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
315 | if (IS_ERR(item)) { | |
316 | ret = PTR_ERR(item); | |
317 | /* a csum that isn't present is a preallocated region. */ | |
318 | if (ret == -ENOENT || ret == -EFBIG) | |
319 | ret = 0; | |
ff79f819 | 320 | csum = 0; |
aadfeb6e | 321 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
322 | goto out; |
323 | } | |
ff79f819 CM |
324 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
325 | BTRFS_CRC32_SIZE); | |
d1310b2e | 326 | set_state_private(io_tree, start, csum); |
07157aac CM |
327 | out: |
328 | if (path) | |
329 | btrfs_free_path(path); | |
330 | mutex_unlock(&root->fs_info->fs_mutex); | |
331 | return ret; | |
332 | } | |
333 | ||
70dec807 CM |
334 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
335 | struct extent_state *state) | |
07157aac | 336 | { |
35ebb934 | 337 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 338 | struct inode *inode = page->mapping->host; |
d1310b2e | 339 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 340 | char *kaddr; |
aadfeb6e | 341 | u64 private = ~(u32)0; |
07157aac | 342 | int ret; |
ff79f819 CM |
343 | struct btrfs_root *root = BTRFS_I(inode)->root; |
344 | u32 csum = ~(u32)0; | |
bbf0d006 | 345 | unsigned long flags; |
d1310b2e | 346 | |
b98b6767 Y |
347 | if (btrfs_test_opt(root, NODATASUM) || |
348 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 349 | return 0; |
d1310b2e | 350 | |
70dec807 CM |
351 | if (state->start == start) { |
352 | private = state->private; | |
353 | ret = 0; | |
354 | } else { | |
355 | ret = get_state_private(io_tree, start, &private); | |
356 | } | |
bbf0d006 | 357 | local_irq_save(flags); |
07157aac CM |
358 | kaddr = kmap_atomic(page, KM_IRQ0); |
359 | if (ret) { | |
360 | goto zeroit; | |
361 | } | |
ff79f819 CM |
362 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
363 | btrfs_csum_final(csum, (char *)&csum); | |
364 | if (csum != private) { | |
07157aac CM |
365 | goto zeroit; |
366 | } | |
367 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 368 | local_irq_restore(flags); |
07157aac CM |
369 | return 0; |
370 | ||
371 | zeroit: | |
aadfeb6e CM |
372 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
373 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
374 | private); | |
db94535d CM |
375 | memset(kaddr + offset, 1, end - start + 1); |
376 | flush_dcache_page(page); | |
07157aac | 377 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 378 | local_irq_restore(flags); |
07157aac CM |
379 | return 0; |
380 | } | |
b888db2b | 381 | |
39279cc3 CM |
382 | void btrfs_read_locked_inode(struct inode *inode) |
383 | { | |
384 | struct btrfs_path *path; | |
5f39d397 | 385 | struct extent_buffer *leaf; |
39279cc3 | 386 | struct btrfs_inode_item *inode_item; |
5f39d397 | 387 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
388 | struct btrfs_root *root = BTRFS_I(inode)->root; |
389 | struct btrfs_key location; | |
390 | u64 alloc_group_block; | |
618e21d5 | 391 | u32 rdev; |
39279cc3 CM |
392 | int ret; |
393 | ||
394 | path = btrfs_alloc_path(); | |
395 | BUG_ON(!path); | |
39279cc3 | 396 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 397 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 398 | |
39279cc3 | 399 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 400 | if (ret) |
39279cc3 | 401 | goto make_bad; |
39279cc3 | 402 | |
5f39d397 CM |
403 | leaf = path->nodes[0]; |
404 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
405 | struct btrfs_inode_item); | |
406 | ||
407 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
408 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
409 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
410 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
411 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
412 | ||
413 | tspec = btrfs_inode_atime(inode_item); | |
414 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
415 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
416 | ||
417 | tspec = btrfs_inode_mtime(inode_item); | |
418 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
419 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
420 | ||
421 | tspec = btrfs_inode_ctime(inode_item); | |
422 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
423 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
424 | ||
425 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
426 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 427 | inode->i_rdev = 0; |
5f39d397 CM |
428 | rdev = btrfs_inode_rdev(leaf, inode_item); |
429 | ||
430 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
431 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
432 | alloc_group_block); | |
b98b6767 | 433 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
434 | if (!BTRFS_I(inode)->block_group) { |
435 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
436 | NULL, 0, 0, 0); | |
437 | } | |
39279cc3 CM |
438 | btrfs_free_path(path); |
439 | inode_item = NULL; | |
440 | ||
441 | mutex_unlock(&root->fs_info->fs_mutex); | |
442 | ||
443 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
444 | case S_IFREG: |
445 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 446 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
447 | inode->i_fop = &btrfs_file_operations; |
448 | inode->i_op = &btrfs_file_inode_operations; | |
449 | break; | |
450 | case S_IFDIR: | |
451 | inode->i_fop = &btrfs_dir_file_operations; | |
452 | if (root == root->fs_info->tree_root) | |
453 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
454 | else | |
455 | inode->i_op = &btrfs_dir_inode_operations; | |
456 | break; | |
457 | case S_IFLNK: | |
458 | inode->i_op = &btrfs_symlink_inode_operations; | |
459 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
460 | break; | |
618e21d5 JB |
461 | default: |
462 | init_special_inode(inode, inode->i_mode, rdev); | |
463 | break; | |
39279cc3 CM |
464 | } |
465 | return; | |
466 | ||
467 | make_bad: | |
468 | btrfs_release_path(root, path); | |
469 | btrfs_free_path(path); | |
470 | mutex_unlock(&root->fs_info->fs_mutex); | |
471 | make_bad_inode(inode); | |
472 | } | |
473 | ||
5f39d397 CM |
474 | static void fill_inode_item(struct extent_buffer *leaf, |
475 | struct btrfs_inode_item *item, | |
39279cc3 CM |
476 | struct inode *inode) |
477 | { | |
5f39d397 CM |
478 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
479 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
480 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
481 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
482 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
483 | ||
484 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
485 | inode->i_atime.tv_sec); | |
486 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
487 | inode->i_atime.tv_nsec); | |
488 | ||
489 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
490 | inode->i_mtime.tv_sec); | |
491 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
492 | inode->i_mtime.tv_nsec); | |
493 | ||
494 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
495 | inode->i_ctime.tv_sec); | |
496 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
497 | inode->i_ctime.tv_nsec); | |
498 | ||
499 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
500 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
501 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 502 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 503 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
504 | BTRFS_I(inode)->block_group->key.objectid); |
505 | } | |
506 | ||
a52d9a80 | 507 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
508 | struct btrfs_root *root, |
509 | struct inode *inode) | |
510 | { | |
511 | struct btrfs_inode_item *inode_item; | |
512 | struct btrfs_path *path; | |
5f39d397 | 513 | struct extent_buffer *leaf; |
39279cc3 CM |
514 | int ret; |
515 | ||
516 | path = btrfs_alloc_path(); | |
517 | BUG_ON(!path); | |
39279cc3 CM |
518 | ret = btrfs_lookup_inode(trans, root, path, |
519 | &BTRFS_I(inode)->location, 1); | |
520 | if (ret) { | |
521 | if (ret > 0) | |
522 | ret = -ENOENT; | |
523 | goto failed; | |
524 | } | |
525 | ||
5f39d397 CM |
526 | leaf = path->nodes[0]; |
527 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
528 | struct btrfs_inode_item); |
529 | ||
5f39d397 CM |
530 | fill_inode_item(leaf, inode_item, inode); |
531 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 532 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
533 | ret = 0; |
534 | failed: | |
535 | btrfs_release_path(root, path); | |
536 | btrfs_free_path(path); | |
537 | return ret; | |
538 | } | |
539 | ||
540 | ||
541 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
542 | struct btrfs_root *root, | |
543 | struct inode *dir, | |
544 | struct dentry *dentry) | |
545 | { | |
546 | struct btrfs_path *path; | |
547 | const char *name = dentry->d_name.name; | |
548 | int name_len = dentry->d_name.len; | |
549 | int ret = 0; | |
5f39d397 | 550 | struct extent_buffer *leaf; |
39279cc3 | 551 | struct btrfs_dir_item *di; |
5f39d397 | 552 | struct btrfs_key key; |
39279cc3 CM |
553 | |
554 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
555 | if (!path) { |
556 | ret = -ENOMEM; | |
557 | goto err; | |
558 | } | |
559 | ||
39279cc3 CM |
560 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
561 | name, name_len, -1); | |
562 | if (IS_ERR(di)) { | |
563 | ret = PTR_ERR(di); | |
564 | goto err; | |
565 | } | |
566 | if (!di) { | |
567 | ret = -ENOENT; | |
568 | goto err; | |
569 | } | |
5f39d397 CM |
570 | leaf = path->nodes[0]; |
571 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 572 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
573 | if (ret) |
574 | goto err; | |
39279cc3 CM |
575 | btrfs_release_path(root, path); |
576 | ||
577 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 578 | key.objectid, name, name_len, -1); |
39279cc3 CM |
579 | if (IS_ERR(di)) { |
580 | ret = PTR_ERR(di); | |
581 | goto err; | |
582 | } | |
583 | if (!di) { | |
584 | ret = -ENOENT; | |
585 | goto err; | |
586 | } | |
587 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
588 | |
589 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
590 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
591 | dentry->d_inode->i_ino, | |
592 | dentry->d_parent->d_inode->i_ino); | |
593 | if (ret) { | |
594 | printk("failed to delete reference to %.*s, " | |
595 | "inode %lu parent %lu\n", name_len, name, | |
596 | dentry->d_inode->i_ino, | |
597 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 598 | } |
39279cc3 CM |
599 | err: |
600 | btrfs_free_path(path); | |
601 | if (!ret) { | |
602 | dir->i_size -= name_len * 2; | |
79c44584 | 603 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 604 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
605 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
606 | dentry->d_inode->i_nlink--; | |
607 | #else | |
39279cc3 | 608 | drop_nlink(dentry->d_inode); |
6da6abae | 609 | #endif |
54aa1f4d | 610 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
611 | dir->i_sb->s_dirt = 1; |
612 | } | |
613 | return ret; | |
614 | } | |
615 | ||
616 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
617 | { | |
618 | struct btrfs_root *root; | |
619 | struct btrfs_trans_handle *trans; | |
2da98f00 | 620 | struct inode *inode = dentry->d_inode; |
39279cc3 | 621 | int ret; |
1832a6d5 | 622 | unsigned long nr = 0; |
39279cc3 CM |
623 | |
624 | root = BTRFS_I(dir)->root; | |
625 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
626 | |
627 | ret = btrfs_check_free_space(root, 1, 1); | |
628 | if (ret) | |
629 | goto fail; | |
630 | ||
39279cc3 | 631 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 632 | |
39279cc3 CM |
633 | btrfs_set_trans_block_group(trans, dir); |
634 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 635 | nr = trans->blocks_used; |
5f39d397 | 636 | |
2da98f00 CM |
637 | if (inode->i_nlink == 0) { |
638 | int found; | |
639 | /* if the inode isn't linked anywhere, | |
640 | * we don't need to worry about | |
641 | * data=ordered | |
642 | */ | |
643 | found = btrfs_del_ordered_inode(inode); | |
644 | if (found == 1) { | |
645 | atomic_dec(&inode->i_count); | |
646 | } | |
647 | } | |
648 | ||
39279cc3 | 649 | btrfs_end_transaction(trans, root); |
1832a6d5 | 650 | fail: |
39279cc3 | 651 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 652 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 653 | btrfs_throttle(root); |
39279cc3 CM |
654 | return ret; |
655 | } | |
656 | ||
657 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
658 | { | |
659 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 660 | int err = 0; |
39279cc3 CM |
661 | int ret; |
662 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 663 | struct btrfs_trans_handle *trans; |
1832a6d5 | 664 | unsigned long nr = 0; |
39279cc3 | 665 | |
134d4512 Y |
666 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
667 | return -ENOTEMPTY; | |
668 | ||
39279cc3 | 669 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
670 | ret = btrfs_check_free_space(root, 1, 1); |
671 | if (ret) | |
672 | goto fail; | |
673 | ||
39279cc3 CM |
674 | trans = btrfs_start_transaction(root, 1); |
675 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
676 | |
677 | /* now the directory is empty */ | |
678 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
679 | if (!err) { | |
680 | inode->i_size = 0; | |
681 | } | |
3954401f | 682 | |
d3c2fdcf | 683 | nr = trans->blocks_used; |
39279cc3 | 684 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 685 | fail: |
134d4512 | 686 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 687 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 688 | btrfs_throttle(root); |
3954401f | 689 | |
39279cc3 CM |
690 | if (ret && !err) |
691 | err = ret; | |
692 | return err; | |
693 | } | |
694 | ||
695 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
696 | struct btrfs_root *root, | |
697 | struct inode *inode) | |
698 | { | |
699 | struct btrfs_path *path; | |
700 | int ret; | |
701 | ||
702 | clear_inode(inode); | |
703 | ||
704 | path = btrfs_alloc_path(); | |
705 | BUG_ON(!path); | |
39279cc3 CM |
706 | ret = btrfs_lookup_inode(trans, root, path, |
707 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
708 | if (ret > 0) |
709 | ret = -ENOENT; | |
710 | if (!ret) | |
711 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
712 | btrfs_free_path(path); |
713 | return ret; | |
714 | } | |
715 | ||
39279cc3 CM |
716 | /* |
717 | * this can truncate away extent items, csum items and directory items. | |
718 | * It starts at a high offset and removes keys until it can't find | |
719 | * any higher than i_size. | |
720 | * | |
721 | * csum items that cross the new i_size are truncated to the new size | |
722 | * as well. | |
723 | */ | |
724 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
725 | struct btrfs_root *root, | |
726 | struct inode *inode) | |
727 | { | |
728 | int ret; | |
729 | struct btrfs_path *path; | |
730 | struct btrfs_key key; | |
5f39d397 | 731 | struct btrfs_key found_key; |
39279cc3 | 732 | u32 found_type; |
5f39d397 | 733 | struct extent_buffer *leaf; |
39279cc3 CM |
734 | struct btrfs_file_extent_item *fi; |
735 | u64 extent_start = 0; | |
db94535d | 736 | u64 extent_num_bytes = 0; |
39279cc3 | 737 | u64 item_end = 0; |
7bb86316 | 738 | u64 root_gen = 0; |
d8d5f3e1 | 739 | u64 root_owner = 0; |
39279cc3 CM |
740 | int found_extent; |
741 | int del_item; | |
179e29e4 | 742 | int extent_type = -1; |
39279cc3 | 743 | |
a52d9a80 | 744 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 745 | path = btrfs_alloc_path(); |
3c69faec | 746 | path->reada = -1; |
39279cc3 | 747 | BUG_ON(!path); |
5f39d397 | 748 | |
39279cc3 CM |
749 | /* FIXME, add redo link to tree so we don't leak on crash */ |
750 | key.objectid = inode->i_ino; | |
751 | key.offset = (u64)-1; | |
5f39d397 CM |
752 | key.type = (u8)-1; |
753 | ||
39279cc3 CM |
754 | while(1) { |
755 | btrfs_init_path(path); | |
756 | fi = NULL; | |
757 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
758 | if (ret < 0) { | |
759 | goto error; | |
760 | } | |
761 | if (ret > 0) { | |
762 | BUG_ON(path->slots[0] == 0); | |
763 | path->slots[0]--; | |
764 | } | |
5f39d397 CM |
765 | leaf = path->nodes[0]; |
766 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
767 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 768 | |
5f39d397 | 769 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 770 | break; |
5f39d397 | 771 | |
39279cc3 CM |
772 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
773 | found_type != BTRFS_DIR_ITEM_KEY && | |
774 | found_type != BTRFS_DIR_INDEX_KEY && | |
775 | found_type != BTRFS_EXTENT_DATA_KEY) | |
776 | break; | |
777 | ||
5f39d397 | 778 | item_end = found_key.offset; |
39279cc3 | 779 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 780 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 781 | struct btrfs_file_extent_item); |
179e29e4 CM |
782 | extent_type = btrfs_file_extent_type(leaf, fi); |
783 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 784 | item_end += |
db94535d | 785 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
786 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
787 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
788 | path->slots[0]); | |
789 | item_end += btrfs_file_extent_inline_len(leaf, | |
790 | item); | |
39279cc3 | 791 | } |
008630c1 | 792 | item_end--; |
39279cc3 CM |
793 | } |
794 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
795 | ret = btrfs_csum_truncate(trans, root, path, | |
796 | inode->i_size); | |
797 | BUG_ON(ret); | |
798 | } | |
008630c1 | 799 | if (item_end < inode->i_size) { |
b888db2b CM |
800 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
801 | found_type = BTRFS_INODE_ITEM_KEY; | |
802 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
803 | found_type = BTRFS_CSUM_ITEM_KEY; | |
804 | } else if (found_type) { | |
805 | found_type--; | |
806 | } else { | |
807 | break; | |
39279cc3 | 808 | } |
a61721d5 | 809 | btrfs_set_key_type(&key, found_type); |
65555a06 | 810 | btrfs_release_path(root, path); |
b888db2b | 811 | continue; |
39279cc3 | 812 | } |
5f39d397 | 813 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
814 | del_item = 1; |
815 | else | |
816 | del_item = 0; | |
817 | found_extent = 0; | |
818 | ||
819 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
820 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
821 | goto delete; | |
822 | ||
823 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 824 | u64 num_dec; |
db94535d | 825 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 826 | if (!del_item) { |
db94535d CM |
827 | u64 orig_num_bytes = |
828 | btrfs_file_extent_num_bytes(leaf, fi); | |
829 | extent_num_bytes = inode->i_size - | |
5f39d397 | 830 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
831 | btrfs_set_file_extent_num_bytes(leaf, fi, |
832 | extent_num_bytes); | |
833 | num_dec = (orig_num_bytes - | |
834 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
835 | if (extent_start != 0) { |
836 | inode->i_blocks -= num_dec; | |
837 | } | |
5f39d397 | 838 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 839 | } else { |
db94535d CM |
840 | extent_num_bytes = |
841 | btrfs_file_extent_disk_num_bytes(leaf, | |
842 | fi); | |
39279cc3 | 843 | /* FIXME blocksize != 4096 */ |
db94535d CM |
844 | num_dec = btrfs_file_extent_num_bytes(leaf, |
845 | fi) >> 9; | |
39279cc3 CM |
846 | if (extent_start != 0) { |
847 | found_extent = 1; | |
848 | inode->i_blocks -= num_dec; | |
849 | } | |
d8d5f3e1 CM |
850 | root_gen = btrfs_header_generation(leaf); |
851 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 852 | } |
179e29e4 CM |
853 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
854 | !del_item) { | |
855 | u32 newsize = inode->i_size - found_key.offset; | |
856 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
857 | ret = btrfs_truncate_item(trans, root, path, | |
858 | newsize, 1); | |
859 | BUG_ON(ret); | |
39279cc3 | 860 | } |
179e29e4 | 861 | delete: |
39279cc3 CM |
862 | if (del_item) { |
863 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
864 | if (ret) |
865 | goto error; | |
39279cc3 CM |
866 | } else { |
867 | break; | |
868 | } | |
869 | btrfs_release_path(root, path); | |
870 | if (found_extent) { | |
871 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 872 | extent_num_bytes, |
d8d5f3e1 | 873 | root_owner, |
7bb86316 CM |
874 | root_gen, inode->i_ino, |
875 | found_key.offset, 0); | |
39279cc3 CM |
876 | BUG_ON(ret); |
877 | } | |
878 | } | |
879 | ret = 0; | |
880 | error: | |
881 | btrfs_release_path(root, path); | |
882 | btrfs_free_path(path); | |
883 | inode->i_sb->s_dirt = 1; | |
884 | return ret; | |
885 | } | |
886 | ||
b888db2b | 887 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
888 | size_t zero_start) |
889 | { | |
890 | char *kaddr; | |
d1310b2e | 891 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
1832a6d5 | 892 | struct btrfs_root *root = BTRFS_I(inode)->root; |
35ebb934 | 893 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 894 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 CM |
895 | u64 existing_delalloc; |
896 | u64 delalloc_start; | |
897 | int ret = 0; | |
a52d9a80 | 898 | |
190662b2 | 899 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 900 | set_page_extent_mapped(page); |
a52d9a80 | 901 | |
d1310b2e | 902 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
1832a6d5 | 903 | delalloc_start = page_start; |
d1310b2e | 904 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->io_tree, |
1832a6d5 CM |
905 | &delalloc_start, page_end, |
906 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
d1310b2e | 907 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 908 | page_end, GFP_NOFS); |
1832a6d5 CM |
909 | |
910 | spin_lock(&root->fs_info->delalloc_lock); | |
911 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc; | |
912 | spin_unlock(&root->fs_info->delalloc_lock); | |
913 | ||
a52d9a80 | 914 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 915 | kaddr = kmap(page); |
a52d9a80 CM |
916 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
917 | flush_dcache_page(page); | |
b888db2b | 918 | kunmap(page); |
a52d9a80 | 919 | } |
b888db2b | 920 | set_page_dirty(page); |
d1310b2e | 921 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 922 | |
a52d9a80 CM |
923 | return ret; |
924 | } | |
925 | ||
39279cc3 CM |
926 | /* |
927 | * taken from block_truncate_page, but does cow as it zeros out | |
928 | * any bytes left in the last page in the file. | |
929 | */ | |
930 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
931 | { | |
932 | struct inode *inode = mapping->host; | |
db94535d CM |
933 | struct btrfs_root *root = BTRFS_I(inode)->root; |
934 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
935 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
936 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
937 | struct page *page; | |
39279cc3 | 938 | int ret = 0; |
a52d9a80 | 939 | u64 page_start; |
39279cc3 CM |
940 | |
941 | if ((offset & (blocksize - 1)) == 0) | |
942 | goto out; | |
943 | ||
944 | ret = -ENOMEM; | |
945 | page = grab_cache_page(mapping, index); | |
946 | if (!page) | |
947 | goto out; | |
39279cc3 | 948 | if (!PageUptodate(page)) { |
9ebefb18 | 949 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
950 | lock_page(page); |
951 | if (!PageUptodate(page)) { | |
952 | ret = -EIO; | |
953 | goto out; | |
954 | } | |
955 | } | |
35ebb934 | 956 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 957 | |
b888db2b | 958 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 959 | |
39279cc3 CM |
960 | unlock_page(page); |
961 | page_cache_release(page); | |
962 | out: | |
963 | return ret; | |
964 | } | |
965 | ||
966 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
967 | { | |
968 | struct inode *inode = dentry->d_inode; | |
969 | int err; | |
970 | ||
971 | err = inode_change_ok(inode, attr); | |
972 | if (err) | |
973 | return err; | |
974 | ||
975 | if (S_ISREG(inode->i_mode) && | |
976 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
977 | struct btrfs_trans_handle *trans; | |
978 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 979 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 980 | |
5f39d397 | 981 | u64 mask = root->sectorsize - 1; |
39279cc3 | 982 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 983 | u64 block_end = attr->ia_size | mask; |
5f56406a | 984 | u64 hole_start; |
39279cc3 | 985 | u64 hole_size; |
179e29e4 | 986 | u64 alloc_hint = 0; |
39279cc3 CM |
987 | |
988 | if (attr->ia_size <= pos) | |
989 | goto out; | |
990 | ||
5f56406a CM |
991 | if (pos != inode->i_size) |
992 | hole_start = pos + root->sectorsize; | |
993 | else | |
994 | hole_start = pos; | |
995 | ||
1832a6d5 CM |
996 | mutex_lock(&root->fs_info->fs_mutex); |
997 | err = btrfs_check_free_space(root, 1, 0); | |
998 | mutex_unlock(&root->fs_info->fs_mutex); | |
999 | if (err) | |
1000 | goto fail; | |
1001 | ||
39279cc3 CM |
1002 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1003 | ||
d1310b2e | 1004 | lock_extent(io_tree, pos, block_end, GFP_NOFS); |
5f56406a | 1005 | hole_size = block_end - hole_start; |
39279cc3 CM |
1006 | |
1007 | mutex_lock(&root->fs_info->fs_mutex); | |
1008 | trans = btrfs_start_transaction(root, 1); | |
1009 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1010 | err = btrfs_drop_extents(trans, root, inode, |
5f56406a | 1011 | pos, block_end, pos, |
3326d1b0 | 1012 | &alloc_hint); |
2bf5a725 | 1013 | |
179e29e4 CM |
1014 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1015 | err = btrfs_insert_file_extent(trans, root, | |
1016 | inode->i_ino, | |
5f56406a CM |
1017 | hole_start, 0, 0, |
1018 | hole_size); | |
d1310b2e CM |
1019 | btrfs_drop_extent_cache(inode, hole_start, |
1020 | hole_size - 1); | |
5f56406a | 1021 | btrfs_check_file(root, inode); |
179e29e4 | 1022 | } |
39279cc3 CM |
1023 | btrfs_end_transaction(trans, root); |
1024 | mutex_unlock(&root->fs_info->fs_mutex); | |
d1310b2e | 1025 | unlock_extent(io_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
1026 | if (err) |
1027 | return err; | |
39279cc3 CM |
1028 | } |
1029 | out: | |
1030 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1031 | fail: |
39279cc3 CM |
1032 | return err; |
1033 | } | |
61295eb8 | 1034 | |
2da98f00 | 1035 | void btrfs_put_inode(struct inode *inode) |
61295eb8 | 1036 | { |
2da98f00 CM |
1037 | int ret; |
1038 | ||
1039 | if (!BTRFS_I(inode)->ordered_trans) { | |
61295eb8 CM |
1040 | return; |
1041 | } | |
2da98f00 CM |
1042 | |
1043 | if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || | |
1044 | mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) | |
1045 | return; | |
1046 | ||
1047 | ret = btrfs_del_ordered_inode(inode); | |
1048 | if (ret == 1) { | |
1049 | atomic_dec(&inode->i_count); | |
1050 | } | |
61295eb8 CM |
1051 | } |
1052 | ||
39279cc3 CM |
1053 | void btrfs_delete_inode(struct inode *inode) |
1054 | { | |
1055 | struct btrfs_trans_handle *trans; | |
1056 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1057 | unsigned long nr; |
39279cc3 CM |
1058 | int ret; |
1059 | ||
1060 | truncate_inode_pages(&inode->i_data, 0); | |
1061 | if (is_bad_inode(inode)) { | |
1062 | goto no_delete; | |
1063 | } | |
5f39d397 | 1064 | |
39279cc3 CM |
1065 | inode->i_size = 0; |
1066 | mutex_lock(&root->fs_info->fs_mutex); | |
1067 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1068 | |
39279cc3 CM |
1069 | btrfs_set_trans_block_group(trans, inode); |
1070 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
1071 | if (ret) |
1072 | goto no_delete_lock; | |
1073 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
1074 | if (ret) |
1075 | goto no_delete_lock; | |
1076 | ret = btrfs_free_inode(trans, root, inode); | |
1077 | if (ret) | |
1078 | goto no_delete_lock; | |
d3c2fdcf | 1079 | nr = trans->blocks_used; |
5f39d397 | 1080 | |
39279cc3 CM |
1081 | btrfs_end_transaction(trans, root); |
1082 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1083 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1084 | btrfs_throttle(root); |
39279cc3 | 1085 | return; |
54aa1f4d CM |
1086 | |
1087 | no_delete_lock: | |
d3c2fdcf | 1088 | nr = trans->blocks_used; |
54aa1f4d CM |
1089 | btrfs_end_transaction(trans, root); |
1090 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1091 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1092 | btrfs_throttle(root); |
39279cc3 CM |
1093 | no_delete: |
1094 | clear_inode(inode); | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * this returns the key found in the dir entry in the location pointer. | |
1099 | * If no dir entries were found, location->objectid is 0. | |
1100 | */ | |
1101 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1102 | struct btrfs_key *location) | |
1103 | { | |
1104 | const char *name = dentry->d_name.name; | |
1105 | int namelen = dentry->d_name.len; | |
1106 | struct btrfs_dir_item *di; | |
1107 | struct btrfs_path *path; | |
1108 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1109 | int ret = 0; |
39279cc3 | 1110 | |
3954401f CM |
1111 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1112 | location->objectid = dir->i_ino; | |
1113 | location->type = BTRFS_INODE_ITEM_KEY; | |
1114 | location->offset = 0; | |
1115 | return 0; | |
1116 | } | |
39279cc3 CM |
1117 | path = btrfs_alloc_path(); |
1118 | BUG_ON(!path); | |
3954401f | 1119 | |
7a720536 | 1120 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1121 | struct btrfs_key key; |
1122 | struct extent_buffer *leaf; | |
1123 | u32 nritems; | |
1124 | int slot; | |
1125 | ||
1126 | key.objectid = dir->i_ino; | |
1127 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1128 | key.offset = 0; | |
1129 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1130 | BUG_ON(ret == 0); | |
1131 | ret = 0; | |
1132 | ||
1133 | leaf = path->nodes[0]; | |
1134 | slot = path->slots[0]; | |
1135 | nritems = btrfs_header_nritems(leaf); | |
1136 | if (slot >= nritems) | |
1137 | goto out_err; | |
1138 | ||
1139 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1140 | if (key.objectid != dir->i_ino || | |
1141 | key.type != BTRFS_INODE_REF_KEY) { | |
1142 | goto out_err; | |
1143 | } | |
1144 | location->objectid = key.offset; | |
1145 | location->type = BTRFS_INODE_ITEM_KEY; | |
1146 | location->offset = 0; | |
1147 | goto out; | |
1148 | } | |
1149 | ||
39279cc3 CM |
1150 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1151 | namelen, 0); | |
0d9f7f3e Y |
1152 | if (IS_ERR(di)) |
1153 | ret = PTR_ERR(di); | |
39279cc3 | 1154 | if (!di || IS_ERR(di)) { |
3954401f | 1155 | goto out_err; |
39279cc3 | 1156 | } |
5f39d397 | 1157 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1158 | out: |
39279cc3 CM |
1159 | btrfs_free_path(path); |
1160 | return ret; | |
3954401f CM |
1161 | out_err: |
1162 | location->objectid = 0; | |
1163 | goto out; | |
39279cc3 CM |
1164 | } |
1165 | ||
1166 | /* | |
1167 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1168 | * needs to be changed to reflect the root directory of the tree root. This | |
1169 | * is kind of like crossing a mount point. | |
1170 | */ | |
1171 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1172 | struct btrfs_key *location, | |
58176a96 JB |
1173 | struct btrfs_root **sub_root, |
1174 | struct dentry *dentry) | |
39279cc3 CM |
1175 | { |
1176 | struct btrfs_path *path; | |
1177 | struct btrfs_root_item *ri; | |
1178 | ||
1179 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1180 | return 0; | |
1181 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1182 | return 0; | |
1183 | ||
1184 | path = btrfs_alloc_path(); | |
1185 | BUG_ON(!path); | |
1186 | mutex_lock(&root->fs_info->fs_mutex); | |
1187 | ||
58176a96 JB |
1188 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1189 | dentry->d_name.name, | |
1190 | dentry->d_name.len); | |
39279cc3 CM |
1191 | if (IS_ERR(*sub_root)) |
1192 | return PTR_ERR(*sub_root); | |
1193 | ||
1194 | ri = &(*sub_root)->root_item; | |
1195 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1196 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1197 | location->offset = 0; | |
1198 | ||
1199 | btrfs_free_path(path); | |
1200 | mutex_unlock(&root->fs_info->fs_mutex); | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1205 | { | |
1206 | struct btrfs_iget_args *args = p; | |
1207 | inode->i_ino = args->ino; | |
1208 | BTRFS_I(inode)->root = args->root; | |
d1310b2e CM |
1209 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1210 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1211 | inode->i_mapping, GFP_NOFS); |
39279cc3 CM |
1212 | return 0; |
1213 | } | |
1214 | ||
1215 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1216 | { | |
1217 | struct btrfs_iget_args *args = opaque; | |
1218 | return (args->ino == inode->i_ino && | |
1219 | args->root == BTRFS_I(inode)->root); | |
1220 | } | |
1221 | ||
dc17ff8f CM |
1222 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1223 | u64 root_objectid) | |
1224 | { | |
1225 | struct btrfs_iget_args args; | |
1226 | args.ino = objectid; | |
1227 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1228 | ||
1229 | if (!args.root) | |
1230 | return NULL; | |
1231 | ||
1232 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1233 | } | |
1234 | ||
39279cc3 CM |
1235 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1236 | struct btrfs_root *root) | |
1237 | { | |
1238 | struct inode *inode; | |
1239 | struct btrfs_iget_args args; | |
1240 | args.ino = objectid; | |
1241 | args.root = root; | |
1242 | ||
1243 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1244 | btrfs_init_locked_inode, | |
1245 | (void *)&args); | |
1246 | return inode; | |
1247 | } | |
1248 | ||
1249 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1250 | struct nameidata *nd) | |
1251 | { | |
1252 | struct inode * inode; | |
1253 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1254 | struct btrfs_root *root = bi->root; | |
1255 | struct btrfs_root *sub_root = root; | |
1256 | struct btrfs_key location; | |
1257 | int ret; | |
1258 | ||
1259 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1260 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1261 | |
39279cc3 CM |
1262 | mutex_lock(&root->fs_info->fs_mutex); |
1263 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1264 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1265 | |
39279cc3 CM |
1266 | if (ret < 0) |
1267 | return ERR_PTR(ret); | |
5f39d397 | 1268 | |
39279cc3 CM |
1269 | inode = NULL; |
1270 | if (location.objectid) { | |
58176a96 JB |
1271 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1272 | dentry); | |
39279cc3 CM |
1273 | if (ret < 0) |
1274 | return ERR_PTR(ret); | |
1275 | if (ret > 0) | |
1276 | return ERR_PTR(-ENOENT); | |
1277 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1278 | sub_root); | |
1279 | if (!inode) | |
1280 | return ERR_PTR(-EACCES); | |
1281 | if (inode->i_state & I_NEW) { | |
1282 | /* the inode and parent dir are two different roots */ | |
1283 | if (sub_root != root) { | |
1284 | igrab(inode); | |
1285 | sub_root->inode = inode; | |
1286 | } | |
1287 | BTRFS_I(inode)->root = sub_root; | |
1288 | memcpy(&BTRFS_I(inode)->location, &location, | |
1289 | sizeof(location)); | |
1290 | btrfs_read_locked_inode(inode); | |
1291 | unlock_new_inode(inode); | |
1292 | } | |
1293 | } | |
1294 | return d_splice_alias(inode, dentry); | |
1295 | } | |
1296 | ||
39279cc3 CM |
1297 | static unsigned char btrfs_filetype_table[] = { |
1298 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1299 | }; | |
1300 | ||
1301 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1302 | { | |
6da6abae | 1303 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1304 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1305 | struct btrfs_item *item; | |
1306 | struct btrfs_dir_item *di; | |
1307 | struct btrfs_key key; | |
5f39d397 | 1308 | struct btrfs_key found_key; |
39279cc3 CM |
1309 | struct btrfs_path *path; |
1310 | int ret; | |
1311 | u32 nritems; | |
5f39d397 | 1312 | struct extent_buffer *leaf; |
39279cc3 CM |
1313 | int slot; |
1314 | int advance; | |
1315 | unsigned char d_type; | |
1316 | int over = 0; | |
1317 | u32 di_cur; | |
1318 | u32 di_total; | |
1319 | u32 di_len; | |
1320 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1321 | char tmp_name[32]; |
1322 | char *name_ptr; | |
1323 | int name_len; | |
39279cc3 CM |
1324 | |
1325 | /* FIXME, use a real flag for deciding about the key type */ | |
1326 | if (root->fs_info->tree_root == root) | |
1327 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1328 | |
3954401f CM |
1329 | /* special case for "." */ |
1330 | if (filp->f_pos == 0) { | |
1331 | over = filldir(dirent, ".", 1, | |
1332 | 1, inode->i_ino, | |
1333 | DT_DIR); | |
1334 | if (over) | |
1335 | return 0; | |
1336 | filp->f_pos = 1; | |
1337 | } | |
1338 | ||
39279cc3 CM |
1339 | mutex_lock(&root->fs_info->fs_mutex); |
1340 | key.objectid = inode->i_ino; | |
3954401f CM |
1341 | path = btrfs_alloc_path(); |
1342 | path->reada = 2; | |
1343 | ||
1344 | /* special case for .., just use the back ref */ | |
1345 | if (filp->f_pos == 1) { | |
1346 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1347 | key.offset = 0; | |
1348 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1349 | BUG_ON(ret == 0); | |
1350 | leaf = path->nodes[0]; | |
1351 | slot = path->slots[0]; | |
1352 | nritems = btrfs_header_nritems(leaf); | |
1353 | if (slot >= nritems) { | |
1354 | btrfs_release_path(root, path); | |
1355 | goto read_dir_items; | |
1356 | } | |
1357 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1358 | btrfs_release_path(root, path); | |
1359 | if (found_key.objectid != key.objectid || | |
1360 | found_key.type != BTRFS_INODE_REF_KEY) | |
1361 | goto read_dir_items; | |
1362 | over = filldir(dirent, "..", 2, | |
1363 | 2, found_key.offset, DT_DIR); | |
1364 | if (over) | |
1365 | goto nopos; | |
1366 | filp->f_pos = 2; | |
1367 | } | |
1368 | ||
1369 | read_dir_items: | |
39279cc3 CM |
1370 | btrfs_set_key_type(&key, key_type); |
1371 | key.offset = filp->f_pos; | |
5f39d397 | 1372 | |
39279cc3 CM |
1373 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1374 | if (ret < 0) | |
1375 | goto err; | |
1376 | advance = 0; | |
39279cc3 | 1377 | while(1) { |
5f39d397 CM |
1378 | leaf = path->nodes[0]; |
1379 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1380 | slot = path->slots[0]; |
1381 | if (advance || slot >= nritems) { | |
1382 | if (slot >= nritems -1) { | |
39279cc3 CM |
1383 | ret = btrfs_next_leaf(root, path); |
1384 | if (ret) | |
1385 | break; | |
5f39d397 CM |
1386 | leaf = path->nodes[0]; |
1387 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1388 | slot = path->slots[0]; |
1389 | } else { | |
1390 | slot++; | |
1391 | path->slots[0]++; | |
1392 | } | |
1393 | } | |
1394 | advance = 1; | |
5f39d397 CM |
1395 | item = btrfs_item_nr(leaf, slot); |
1396 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1397 | ||
1398 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1399 | break; |
5f39d397 | 1400 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1401 | break; |
5f39d397 | 1402 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1403 | continue; |
5f39d397 CM |
1404 | |
1405 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1406 | advance = 1; |
1407 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1408 | di_cur = 0; | |
5f39d397 | 1409 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1410 | while(di_cur < di_total) { |
5f39d397 CM |
1411 | struct btrfs_key location; |
1412 | ||
1413 | name_len = btrfs_dir_name_len(leaf, di); | |
1414 | if (name_len < 32) { | |
1415 | name_ptr = tmp_name; | |
1416 | } else { | |
1417 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1418 | BUG_ON(!name_ptr); | |
1419 | } | |
1420 | read_extent_buffer(leaf, name_ptr, | |
1421 | (unsigned long)(di + 1), name_len); | |
1422 | ||
1423 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1424 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1425 | over = filldir(dirent, name_ptr, name_len, |
1426 | found_key.offset, | |
1427 | location.objectid, | |
39279cc3 | 1428 | d_type); |
5f39d397 CM |
1429 | |
1430 | if (name_ptr != tmp_name) | |
1431 | kfree(name_ptr); | |
1432 | ||
39279cc3 CM |
1433 | if (over) |
1434 | goto nopos; | |
5103e947 JB |
1435 | di_len = btrfs_dir_name_len(leaf, di) + |
1436 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1437 | di_cur += di_len; |
1438 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1439 | } | |
1440 | } | |
c2a8b6e1 | 1441 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); |
39279cc3 CM |
1442 | nopos: |
1443 | ret = 0; | |
1444 | err: | |
1445 | btrfs_release_path(root, path); | |
1446 | btrfs_free_path(path); | |
1447 | mutex_unlock(&root->fs_info->fs_mutex); | |
1448 | return ret; | |
1449 | } | |
1450 | ||
1451 | int btrfs_write_inode(struct inode *inode, int wait) | |
1452 | { | |
1453 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1454 | struct btrfs_trans_handle *trans; | |
1455 | int ret = 0; | |
1456 | ||
1457 | if (wait) { | |
1458 | mutex_lock(&root->fs_info->fs_mutex); | |
1459 | trans = btrfs_start_transaction(root, 1); | |
1460 | btrfs_set_trans_block_group(trans, inode); | |
1461 | ret = btrfs_commit_transaction(trans, root); | |
1462 | mutex_unlock(&root->fs_info->fs_mutex); | |
1463 | } | |
1464 | return ret; | |
1465 | } | |
1466 | ||
1467 | /* | |
54aa1f4d | 1468 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1469 | * inode changes. But, it is most likely to find the inode in cache. |
1470 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1471 | * to keep or drop this code. | |
1472 | */ | |
1473 | void btrfs_dirty_inode(struct inode *inode) | |
1474 | { | |
1475 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1476 | struct btrfs_trans_handle *trans; | |
1477 | ||
1478 | mutex_lock(&root->fs_info->fs_mutex); | |
1479 | trans = btrfs_start_transaction(root, 1); | |
1480 | btrfs_set_trans_block_group(trans, inode); | |
1481 | btrfs_update_inode(trans, root, inode); | |
1482 | btrfs_end_transaction(trans, root); | |
1483 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1484 | } |
1485 | ||
1486 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1487 | struct btrfs_root *root, | |
1488 | u64 objectid, | |
1489 | struct btrfs_block_group_cache *group, | |
1490 | int mode) | |
1491 | { | |
1492 | struct inode *inode; | |
5f39d397 | 1493 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1494 | struct btrfs_key *location; |
5f39d397 | 1495 | struct btrfs_path *path; |
39279cc3 CM |
1496 | int ret; |
1497 | int owner; | |
1498 | ||
5f39d397 CM |
1499 | path = btrfs_alloc_path(); |
1500 | BUG_ON(!path); | |
1501 | ||
39279cc3 CM |
1502 | inode = new_inode(root->fs_info->sb); |
1503 | if (!inode) | |
1504 | return ERR_PTR(-ENOMEM); | |
1505 | ||
d1310b2e CM |
1506 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1507 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1508 | inode->i_mapping, GFP_NOFS); |
39279cc3 | 1509 | BTRFS_I(inode)->root = root; |
b888db2b | 1510 | |
39279cc3 CM |
1511 | if (mode & S_IFDIR) |
1512 | owner = 0; | |
1513 | else | |
1514 | owner = 1; | |
1515 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1516 | BTRFS_I(inode)->block_group = group; | |
b98b6767 | 1517 | BTRFS_I(inode)->flags = 0; |
5f39d397 CM |
1518 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1519 | if (ret) | |
1520 | goto fail; | |
1521 | ||
39279cc3 CM |
1522 | inode->i_uid = current->fsuid; |
1523 | inode->i_gid = current->fsgid; | |
1524 | inode->i_mode = mode; | |
1525 | inode->i_ino = objectid; | |
1526 | inode->i_blocks = 0; | |
1527 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1528 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1529 | struct btrfs_inode_item); | |
1530 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1531 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1532 | btrfs_free_path(path); | |
1533 | ||
39279cc3 CM |
1534 | location = &BTRFS_I(inode)->location; |
1535 | location->objectid = objectid; | |
39279cc3 CM |
1536 | location->offset = 0; |
1537 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1538 | ||
39279cc3 CM |
1539 | insert_inode_hash(inode); |
1540 | return inode; | |
5f39d397 CM |
1541 | fail: |
1542 | btrfs_free_path(path); | |
1543 | return ERR_PTR(ret); | |
39279cc3 CM |
1544 | } |
1545 | ||
1546 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1547 | { | |
1548 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1549 | } | |
1550 | ||
1551 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1552 | struct dentry *dentry, struct inode *inode) | |
1553 | { | |
1554 | int ret; | |
1555 | struct btrfs_key key; | |
1556 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1557 | struct inode *parent_inode; |
5f39d397 | 1558 | |
39279cc3 | 1559 | key.objectid = inode->i_ino; |
39279cc3 CM |
1560 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1561 | key.offset = 0; | |
1562 | ||
1563 | ret = btrfs_insert_dir_item(trans, root, | |
1564 | dentry->d_name.name, dentry->d_name.len, | |
1565 | dentry->d_parent->d_inode->i_ino, | |
1566 | &key, btrfs_inode_type(inode)); | |
1567 | if (ret == 0) { | |
76fea00a CM |
1568 | ret = btrfs_insert_inode_ref(trans, root, |
1569 | dentry->d_name.name, | |
1570 | dentry->d_name.len, | |
1571 | inode->i_ino, | |
1572 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1573 | parent_inode = dentry->d_parent->d_inode; |
1574 | parent_inode->i_size += dentry->d_name.len * 2; | |
1575 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1576 | ret = btrfs_update_inode(trans, root, |
1577 | dentry->d_parent->d_inode); | |
1578 | } | |
1579 | return ret; | |
1580 | } | |
1581 | ||
1582 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1583 | struct dentry *dentry, struct inode *inode) | |
1584 | { | |
1585 | int err = btrfs_add_link(trans, dentry, inode); | |
1586 | if (!err) { | |
1587 | d_instantiate(dentry, inode); | |
1588 | return 0; | |
1589 | } | |
1590 | if (err > 0) | |
1591 | err = -EEXIST; | |
1592 | return err; | |
1593 | } | |
1594 | ||
618e21d5 JB |
1595 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1596 | int mode, dev_t rdev) | |
1597 | { | |
1598 | struct btrfs_trans_handle *trans; | |
1599 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1600 | struct inode *inode = NULL; |
618e21d5 JB |
1601 | int err; |
1602 | int drop_inode = 0; | |
1603 | u64 objectid; | |
1832a6d5 | 1604 | unsigned long nr = 0; |
618e21d5 JB |
1605 | |
1606 | if (!new_valid_dev(rdev)) | |
1607 | return -EINVAL; | |
1608 | ||
1609 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1610 | err = btrfs_check_free_space(root, 1, 0); |
1611 | if (err) | |
1612 | goto fail; | |
1613 | ||
618e21d5 JB |
1614 | trans = btrfs_start_transaction(root, 1); |
1615 | btrfs_set_trans_block_group(trans, dir); | |
1616 | ||
1617 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1618 | if (err) { | |
1619 | err = -ENOSPC; | |
1620 | goto out_unlock; | |
1621 | } | |
1622 | ||
1623 | inode = btrfs_new_inode(trans, root, objectid, | |
1624 | BTRFS_I(dir)->block_group, mode); | |
1625 | err = PTR_ERR(inode); | |
1626 | if (IS_ERR(inode)) | |
1627 | goto out_unlock; | |
1628 | ||
1629 | btrfs_set_trans_block_group(trans, inode); | |
1630 | err = btrfs_add_nondir(trans, dentry, inode); | |
1631 | if (err) | |
1632 | drop_inode = 1; | |
1633 | else { | |
1634 | inode->i_op = &btrfs_special_inode_operations; | |
1635 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1636 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1637 | } |
1638 | dir->i_sb->s_dirt = 1; | |
1639 | btrfs_update_inode_block_group(trans, inode); | |
1640 | btrfs_update_inode_block_group(trans, dir); | |
1641 | out_unlock: | |
d3c2fdcf | 1642 | nr = trans->blocks_used; |
618e21d5 | 1643 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1644 | fail: |
618e21d5 JB |
1645 | mutex_unlock(&root->fs_info->fs_mutex); |
1646 | ||
1647 | if (drop_inode) { | |
1648 | inode_dec_link_count(inode); | |
1649 | iput(inode); | |
1650 | } | |
d3c2fdcf | 1651 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1652 | btrfs_throttle(root); |
618e21d5 JB |
1653 | return err; |
1654 | } | |
1655 | ||
39279cc3 CM |
1656 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1657 | int mode, struct nameidata *nd) | |
1658 | { | |
1659 | struct btrfs_trans_handle *trans; | |
1660 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1661 | struct inode *inode = NULL; |
39279cc3 CM |
1662 | int err; |
1663 | int drop_inode = 0; | |
1832a6d5 | 1664 | unsigned long nr = 0; |
39279cc3 CM |
1665 | u64 objectid; |
1666 | ||
1667 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1668 | err = btrfs_check_free_space(root, 1, 0); |
1669 | if (err) | |
1670 | goto fail; | |
39279cc3 CM |
1671 | trans = btrfs_start_transaction(root, 1); |
1672 | btrfs_set_trans_block_group(trans, dir); | |
1673 | ||
1674 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1675 | if (err) { | |
1676 | err = -ENOSPC; | |
1677 | goto out_unlock; | |
1678 | } | |
1679 | ||
1680 | inode = btrfs_new_inode(trans, root, objectid, | |
1681 | BTRFS_I(dir)->block_group, mode); | |
1682 | err = PTR_ERR(inode); | |
1683 | if (IS_ERR(inode)) | |
1684 | goto out_unlock; | |
1685 | ||
1686 | btrfs_set_trans_block_group(trans, inode); | |
1687 | err = btrfs_add_nondir(trans, dentry, inode); | |
1688 | if (err) | |
1689 | drop_inode = 1; | |
1690 | else { | |
1691 | inode->i_mapping->a_ops = &btrfs_aops; | |
1692 | inode->i_fop = &btrfs_file_operations; | |
1693 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1694 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1695 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1696 | inode->i_mapping, GFP_NOFS); |
d1310b2e | 1697 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1698 | } |
1699 | dir->i_sb->s_dirt = 1; | |
1700 | btrfs_update_inode_block_group(trans, inode); | |
1701 | btrfs_update_inode_block_group(trans, dir); | |
1702 | out_unlock: | |
d3c2fdcf | 1703 | nr = trans->blocks_used; |
39279cc3 | 1704 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1705 | fail: |
39279cc3 CM |
1706 | mutex_unlock(&root->fs_info->fs_mutex); |
1707 | ||
1708 | if (drop_inode) { | |
1709 | inode_dec_link_count(inode); | |
1710 | iput(inode); | |
1711 | } | |
d3c2fdcf | 1712 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1713 | btrfs_throttle(root); |
39279cc3 CM |
1714 | return err; |
1715 | } | |
1716 | ||
1717 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1718 | struct dentry *dentry) | |
1719 | { | |
1720 | struct btrfs_trans_handle *trans; | |
1721 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1722 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1723 | unsigned long nr = 0; |
39279cc3 CM |
1724 | int err; |
1725 | int drop_inode = 0; | |
1726 | ||
1727 | if (inode->i_nlink == 0) | |
1728 | return -ENOENT; | |
1729 | ||
6da6abae CM |
1730 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1731 | inode->i_nlink++; | |
1732 | #else | |
39279cc3 | 1733 | inc_nlink(inode); |
6da6abae | 1734 | #endif |
39279cc3 | 1735 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1736 | err = btrfs_check_free_space(root, 1, 0); |
1737 | if (err) | |
1738 | goto fail; | |
39279cc3 | 1739 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1740 | |
39279cc3 CM |
1741 | btrfs_set_trans_block_group(trans, dir); |
1742 | atomic_inc(&inode->i_count); | |
1743 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1744 | |
39279cc3 CM |
1745 | if (err) |
1746 | drop_inode = 1; | |
5f39d397 | 1747 | |
39279cc3 CM |
1748 | dir->i_sb->s_dirt = 1; |
1749 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1750 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1751 | |
54aa1f4d CM |
1752 | if (err) |
1753 | drop_inode = 1; | |
39279cc3 | 1754 | |
d3c2fdcf | 1755 | nr = trans->blocks_used; |
39279cc3 | 1756 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1757 | fail: |
39279cc3 CM |
1758 | mutex_unlock(&root->fs_info->fs_mutex); |
1759 | ||
1760 | if (drop_inode) { | |
1761 | inode_dec_link_count(inode); | |
1762 | iput(inode); | |
1763 | } | |
d3c2fdcf | 1764 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1765 | btrfs_throttle(root); |
39279cc3 CM |
1766 | return err; |
1767 | } | |
1768 | ||
39279cc3 CM |
1769 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1770 | { | |
1771 | struct inode *inode; | |
1772 | struct btrfs_trans_handle *trans; | |
1773 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1774 | int err = 0; | |
1775 | int drop_on_err = 0; | |
1776 | u64 objectid; | |
d3c2fdcf | 1777 | unsigned long nr = 1; |
39279cc3 CM |
1778 | |
1779 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1780 | err = btrfs_check_free_space(root, 1, 0); |
1781 | if (err) | |
1782 | goto out_unlock; | |
1783 | ||
39279cc3 CM |
1784 | trans = btrfs_start_transaction(root, 1); |
1785 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1786 | |
39279cc3 CM |
1787 | if (IS_ERR(trans)) { |
1788 | err = PTR_ERR(trans); | |
1789 | goto out_unlock; | |
1790 | } | |
1791 | ||
1792 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1793 | if (err) { | |
1794 | err = -ENOSPC; | |
1795 | goto out_unlock; | |
1796 | } | |
1797 | ||
1798 | inode = btrfs_new_inode(trans, root, objectid, | |
1799 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1800 | if (IS_ERR(inode)) { | |
1801 | err = PTR_ERR(inode); | |
1802 | goto out_fail; | |
1803 | } | |
5f39d397 | 1804 | |
39279cc3 CM |
1805 | drop_on_err = 1; |
1806 | inode->i_op = &btrfs_dir_inode_operations; | |
1807 | inode->i_fop = &btrfs_dir_file_operations; | |
1808 | btrfs_set_trans_block_group(trans, inode); | |
1809 | ||
3954401f | 1810 | inode->i_size = 0; |
39279cc3 CM |
1811 | err = btrfs_update_inode(trans, root, inode); |
1812 | if (err) | |
1813 | goto out_fail; | |
5f39d397 | 1814 | |
39279cc3 CM |
1815 | err = btrfs_add_link(trans, dentry, inode); |
1816 | if (err) | |
1817 | goto out_fail; | |
5f39d397 | 1818 | |
39279cc3 CM |
1819 | d_instantiate(dentry, inode); |
1820 | drop_on_err = 0; | |
1821 | dir->i_sb->s_dirt = 1; | |
1822 | btrfs_update_inode_block_group(trans, inode); | |
1823 | btrfs_update_inode_block_group(trans, dir); | |
1824 | ||
1825 | out_fail: | |
d3c2fdcf | 1826 | nr = trans->blocks_used; |
39279cc3 | 1827 | btrfs_end_transaction(trans, root); |
5f39d397 | 1828 | |
39279cc3 CM |
1829 | out_unlock: |
1830 | mutex_unlock(&root->fs_info->fs_mutex); | |
1831 | if (drop_on_err) | |
1832 | iput(inode); | |
d3c2fdcf | 1833 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1834 | btrfs_throttle(root); |
39279cc3 CM |
1835 | return err; |
1836 | } | |
1837 | ||
a52d9a80 | 1838 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 1839 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
1840 | int create) |
1841 | { | |
1842 | int ret; | |
1843 | int err = 0; | |
db94535d | 1844 | u64 bytenr; |
a52d9a80 CM |
1845 | u64 extent_start = 0; |
1846 | u64 extent_end = 0; | |
1847 | u64 objectid = inode->i_ino; | |
1848 | u32 found_type; | |
a52d9a80 CM |
1849 | struct btrfs_path *path; |
1850 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1851 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1852 | struct extent_buffer *leaf; |
1853 | struct btrfs_key found_key; | |
a52d9a80 CM |
1854 | struct extent_map *em = NULL; |
1855 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 1856 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
1857 | struct btrfs_trans_handle *trans = NULL; |
1858 | ||
1859 | path = btrfs_alloc_path(); | |
1860 | BUG_ON(!path); | |
1861 | mutex_lock(&root->fs_info->fs_mutex); | |
1862 | ||
1863 | again: | |
d1310b2e CM |
1864 | spin_lock(&em_tree->lock); |
1865 | em = lookup_extent_mapping(em_tree, start, len); | |
1866 | spin_unlock(&em_tree->lock); | |
1867 | ||
a52d9a80 | 1868 | if (em) { |
56b453c9 | 1869 | if (em->start > start) { |
d1310b2e CM |
1870 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
1871 | start, len, em->start, em->len); | |
56b453c9 CM |
1872 | WARN_ON(1); |
1873 | } | |
70dec807 CM |
1874 | if (em->block_start == EXTENT_MAP_INLINE && page) |
1875 | free_extent_map(em); | |
1876 | else | |
1877 | goto out; | |
a52d9a80 | 1878 | } |
d1310b2e | 1879 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 1880 | if (!em) { |
d1310b2e CM |
1881 | err = -ENOMEM; |
1882 | goto out; | |
a52d9a80 | 1883 | } |
d1310b2e CM |
1884 | |
1885 | em->start = EXTENT_MAP_HOLE; | |
1886 | em->len = (u64)-1; | |
a52d9a80 | 1887 | em->bdev = inode->i_sb->s_bdev; |
179e29e4 CM |
1888 | ret = btrfs_lookup_file_extent(trans, root, path, |
1889 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1890 | if (ret < 0) { |
1891 | err = ret; | |
1892 | goto out; | |
1893 | } | |
1894 | ||
1895 | if (ret != 0) { | |
1896 | if (path->slots[0] == 0) | |
1897 | goto not_found; | |
1898 | path->slots[0]--; | |
1899 | } | |
1900 | ||
5f39d397 CM |
1901 | leaf = path->nodes[0]; |
1902 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1903 | struct btrfs_file_extent_item); |
a52d9a80 | 1904 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1905 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1906 | found_type = btrfs_key_type(&found_key); | |
1907 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1908 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1909 | goto not_found; | |
1910 | } | |
1911 | ||
5f39d397 CM |
1912 | found_type = btrfs_file_extent_type(leaf, item); |
1913 | extent_start = found_key.offset; | |
a52d9a80 CM |
1914 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1915 | extent_end = extent_start + | |
db94535d | 1916 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1917 | err = 0; |
b888db2b | 1918 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1919 | em->start = start; |
1920 | if (start < extent_start) { | |
d1310b2e | 1921 | if (start + len <= extent_start) |
b888db2b | 1922 | goto not_found; |
d1310b2e | 1923 | em->len = extent_end - extent_start; |
a52d9a80 | 1924 | } else { |
d1310b2e | 1925 | em->len = len; |
a52d9a80 CM |
1926 | } |
1927 | goto not_found_em; | |
1928 | } | |
db94535d CM |
1929 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1930 | if (bytenr == 0) { | |
a52d9a80 | 1931 | em->start = extent_start; |
d1310b2e | 1932 | em->len = extent_end - extent_start; |
5f39d397 | 1933 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
1934 | goto insert; |
1935 | } | |
db94535d CM |
1936 | bytenr += btrfs_file_extent_offset(leaf, item); |
1937 | em->block_start = bytenr; | |
a52d9a80 | 1938 | em->start = extent_start; |
d1310b2e | 1939 | em->len = extent_end - extent_start; |
a52d9a80 CM |
1940 | goto insert; |
1941 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 1942 | u64 page_start; |
5f39d397 | 1943 | unsigned long ptr; |
a52d9a80 | 1944 | char *map; |
3326d1b0 CM |
1945 | size_t size; |
1946 | size_t extent_offset; | |
1947 | size_t copy_size; | |
a52d9a80 | 1948 | |
5f39d397 CM |
1949 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1950 | path->slots[0])); | |
d1310b2e CM |
1951 | extent_end = (extent_start + size + root->sectorsize - 1) & |
1952 | ~((u64)root->sectorsize - 1); | |
b888db2b | 1953 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1954 | em->start = start; |
1955 | if (start < extent_start) { | |
d1310b2e | 1956 | if (start + len <= extent_start) |
b888db2b | 1957 | goto not_found; |
d1310b2e | 1958 | em->len = extent_end - extent_start; |
a52d9a80 | 1959 | } else { |
d1310b2e | 1960 | em->len = len; |
a52d9a80 CM |
1961 | } |
1962 | goto not_found_em; | |
1963 | } | |
689f9346 | 1964 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
1965 | |
1966 | if (!page) { | |
1967 | em->start = extent_start; | |
d1310b2e | 1968 | em->len = size; |
689f9346 Y |
1969 | goto out; |
1970 | } | |
5f39d397 | 1971 | |
70dec807 CM |
1972 | page_start = page_offset(page) + pg_offset; |
1973 | extent_offset = page_start - extent_start; | |
1974 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 1975 | size - extent_offset); |
3326d1b0 | 1976 | em->start = extent_start + extent_offset; |
70dec807 CM |
1977 | em->len = (copy_size + root->sectorsize - 1) & |
1978 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
1979 | map = kmap(page); |
1980 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 1981 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 1982 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
1983 | copy_size); |
1984 | flush_dcache_page(page); | |
1985 | } else if (create && PageUptodate(page)) { | |
1986 | if (!trans) { | |
1987 | kunmap(page); | |
1988 | free_extent_map(em); | |
1989 | em = NULL; | |
1990 | btrfs_release_path(root, path); | |
1991 | trans = btrfs_start_transaction(root, 1); | |
1992 | goto again; | |
1993 | } | |
70dec807 | 1994 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
1995 | copy_size); |
1996 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1997 | } |
a52d9a80 | 1998 | kunmap(page); |
d1310b2e CM |
1999 | set_extent_uptodate(io_tree, em->start, |
2000 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2001 | goto insert; |
2002 | } else { | |
2003 | printk("unkknown found_type %d\n", found_type); | |
2004 | WARN_ON(1); | |
2005 | } | |
2006 | not_found: | |
2007 | em->start = start; | |
d1310b2e | 2008 | em->len = len; |
a52d9a80 | 2009 | not_found_em: |
5f39d397 | 2010 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2011 | insert: |
2012 | btrfs_release_path(root, path); | |
d1310b2e CM |
2013 | if (em->start > start || extent_map_end(em) <= start) { |
2014 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2015 | err = -EIO; |
2016 | goto out; | |
2017 | } | |
d1310b2e CM |
2018 | |
2019 | err = 0; | |
2020 | spin_lock(&em_tree->lock); | |
a52d9a80 CM |
2021 | ret = add_extent_mapping(em_tree, em); |
2022 | if (ret == -EEXIST) { | |
2023 | free_extent_map(em); | |
d1310b2e CM |
2024 | em = lookup_extent_mapping(em_tree, start, len); |
2025 | if (!em) { | |
a52d9a80 | 2026 | err = -EIO; |
d1310b2e | 2027 | printk("failing to insert %Lu %Lu\n", start, len); |
a52d9a80 | 2028 | } |
a52d9a80 | 2029 | } |
d1310b2e | 2030 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2031 | out: |
2032 | btrfs_free_path(path); | |
2033 | if (trans) { | |
2034 | ret = btrfs_end_transaction(trans, root); | |
2035 | if (!err) | |
2036 | err = ret; | |
2037 | } | |
2038 | mutex_unlock(&root->fs_info->fs_mutex); | |
2039 | if (err) { | |
2040 | free_extent_map(em); | |
2041 | WARN_ON(1); | |
2042 | return ERR_PTR(err); | |
2043 | } | |
2044 | return em; | |
2045 | } | |
2046 | ||
d396c6f5 | 2047 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2048 | { |
d396c6f5 | 2049 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2050 | } |
2051 | ||
a52d9a80 | 2052 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2053 | { |
d1310b2e CM |
2054 | struct extent_io_tree *tree; |
2055 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2056 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2057 | } |
1832a6d5 | 2058 | |
a52d9a80 | 2059 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2060 | { |
d1310b2e | 2061 | struct extent_io_tree *tree; |
b888db2b CM |
2062 | |
2063 | ||
2064 | if (current->flags & PF_MEMALLOC) { | |
2065 | redirty_page_for_writepage(wbc, page); | |
2066 | unlock_page(page); | |
2067 | return 0; | |
2068 | } | |
d1310b2e | 2069 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2070 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2071 | } |
2072 | ||
b293f02e CM |
2073 | static int btrfs_writepages(struct address_space *mapping, |
2074 | struct writeback_control *wbc) | |
2075 | { | |
d1310b2e CM |
2076 | struct extent_io_tree *tree; |
2077 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2078 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2079 | } | |
2080 | ||
3ab2fb5a CM |
2081 | static int |
2082 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2083 | struct list_head *pages, unsigned nr_pages) | |
2084 | { | |
d1310b2e CM |
2085 | struct extent_io_tree *tree; |
2086 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2087 | return extent_readpages(tree, mapping, pages, nr_pages, |
2088 | btrfs_get_extent); | |
2089 | } | |
2090 | ||
70dec807 | 2091 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2092 | { |
d1310b2e CM |
2093 | struct extent_io_tree *tree; |
2094 | struct extent_map_tree *map; | |
a52d9a80 | 2095 | int ret; |
8c2383c3 | 2096 | |
d1310b2e CM |
2097 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2098 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2099 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2100 | if (ret == 1) { |
2101 | ClearPagePrivate(page); | |
2102 | set_page_private(page, 0); | |
2103 | page_cache_release(page); | |
39279cc3 | 2104 | } |
a52d9a80 | 2105 | return ret; |
39279cc3 CM |
2106 | } |
2107 | ||
a52d9a80 | 2108 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2109 | { |
d1310b2e | 2110 | struct extent_io_tree *tree; |
39279cc3 | 2111 | |
d1310b2e | 2112 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2113 | extent_invalidatepage(tree, page, offset); |
2114 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2115 | } |
2116 | ||
9ebefb18 CM |
2117 | /* |
2118 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2119 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2120 | * be careful to check for EOF conditions here. We set the page up correctly | |
2121 | * for a written page which means we get ENOSPC checking when writing into | |
2122 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2123 | * support these features. | |
2124 | * | |
2125 | * We are not allowed to take the i_mutex here so we have to play games to | |
2126 | * protect against truncate races as the page could now be beyond EOF. Because | |
2127 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2128 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2129 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2130 | * unlock the page. | |
2131 | */ | |
2132 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2133 | { | |
6da6abae | 2134 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2135 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2136 | unsigned long end; |
2137 | loff_t size; | |
1832a6d5 | 2138 | int ret; |
a52d9a80 | 2139 | u64 page_start; |
9ebefb18 | 2140 | |
1832a6d5 CM |
2141 | mutex_lock(&root->fs_info->fs_mutex); |
2142 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2143 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2144 | if (ret) |
2145 | goto out; | |
2146 | ||
2147 | ret = -EINVAL; | |
2148 | ||
9ebefb18 CM |
2149 | lock_page(page); |
2150 | wait_on_page_writeback(page); | |
9ebefb18 | 2151 | size = i_size_read(inode); |
35ebb934 | 2152 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2153 | |
9ebefb18 | 2154 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2155 | (page_start > size)) { |
9ebefb18 CM |
2156 | /* page got truncated out from underneath us */ |
2157 | goto out_unlock; | |
2158 | } | |
2159 | ||
2160 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2161 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2162 | end = size & ~PAGE_CACHE_MASK; |
2163 | else | |
2164 | end = PAGE_CACHE_SIZE; | |
2165 | ||
b888db2b | 2166 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2167 | |
2168 | out_unlock: | |
2169 | unlock_page(page); | |
1832a6d5 | 2170 | out: |
9ebefb18 CM |
2171 | return ret; |
2172 | } | |
2173 | ||
39279cc3 CM |
2174 | static void btrfs_truncate(struct inode *inode) |
2175 | { | |
2176 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2177 | int ret; | |
2178 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2179 | unsigned long nr; |
39279cc3 CM |
2180 | |
2181 | if (!S_ISREG(inode->i_mode)) | |
2182 | return; | |
2183 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2184 | return; | |
2185 | ||
2186 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2187 | ||
2188 | mutex_lock(&root->fs_info->fs_mutex); | |
2189 | trans = btrfs_start_transaction(root, 1); | |
2190 | btrfs_set_trans_block_group(trans, inode); | |
2191 | ||
2192 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
2193 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 2194 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2195 | nr = trans->blocks_used; |
5f39d397 | 2196 | |
39279cc3 CM |
2197 | ret = btrfs_end_transaction(trans, root); |
2198 | BUG_ON(ret); | |
2199 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2200 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2201 | btrfs_throttle(root); |
39279cc3 CM |
2202 | } |
2203 | ||
4313b399 CM |
2204 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2205 | int namelen) | |
39279cc3 CM |
2206 | { |
2207 | struct btrfs_trans_handle *trans; | |
2208 | struct btrfs_key key; | |
2209 | struct btrfs_root_item root_item; | |
2210 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2211 | struct extent_buffer *leaf; |
dc17ff8f | 2212 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2213 | struct inode *inode; |
2214 | struct inode *dir; | |
2215 | int ret; | |
54aa1f4d | 2216 | int err; |
39279cc3 CM |
2217 | u64 objectid; |
2218 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2219 | unsigned long nr = 1; |
39279cc3 CM |
2220 | |
2221 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2222 | ret = btrfs_check_free_space(root, 1, 0); |
2223 | if (ret) | |
2224 | goto fail_commit; | |
2225 | ||
39279cc3 CM |
2226 | trans = btrfs_start_transaction(root, 1); |
2227 | BUG_ON(!trans); | |
2228 | ||
7bb86316 CM |
2229 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2230 | 0, &objectid); | |
2231 | if (ret) | |
2232 | goto fail; | |
2233 | ||
2234 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2235 | objectid, trans->transid, 0, 0, | |
2236 | 0, 0); | |
5f39d397 CM |
2237 | if (IS_ERR(leaf)) |
2238 | return PTR_ERR(leaf); | |
2239 | ||
2240 | btrfs_set_header_nritems(leaf, 0); | |
2241 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2242 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2243 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2244 | btrfs_set_header_owner(leaf, objectid); |
2245 | ||
5f39d397 CM |
2246 | write_extent_buffer(leaf, root->fs_info->fsid, |
2247 | (unsigned long)btrfs_header_fsid(leaf), | |
2248 | BTRFS_FSID_SIZE); | |
2249 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2250 | |
2251 | inode_item = &root_item.inode; | |
2252 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2253 | inode_item->generation = cpu_to_le64(1); |
2254 | inode_item->size = cpu_to_le64(3); | |
2255 | inode_item->nlink = cpu_to_le32(1); | |
2256 | inode_item->nblocks = cpu_to_le64(1); | |
2257 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2258 | |
db94535d CM |
2259 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2260 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2261 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2262 | btrfs_set_root_used(&root_item, 0); |
2263 | ||
5eda7b5e CM |
2264 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2265 | root_item.drop_level = 0; | |
5f39d397 CM |
2266 | |
2267 | free_extent_buffer(leaf); | |
2268 | leaf = NULL; | |
39279cc3 | 2269 | |
39279cc3 CM |
2270 | btrfs_set_root_dirid(&root_item, new_dirid); |
2271 | ||
2272 | key.objectid = objectid; | |
2273 | key.offset = 1; | |
39279cc3 CM |
2274 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2275 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2276 | &root_item); | |
54aa1f4d CM |
2277 | if (ret) |
2278 | goto fail; | |
39279cc3 CM |
2279 | |
2280 | /* | |
2281 | * insert the directory item | |
2282 | */ | |
2283 | key.offset = (u64)-1; | |
2284 | dir = root->fs_info->sb->s_root->d_inode; | |
2285 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2286 | name, namelen, dir->i_ino, &key, | |
2287 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2288 | if (ret) |
2289 | goto fail; | |
39279cc3 | 2290 | |
3954401f CM |
2291 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2292 | name, namelen, objectid, | |
2293 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2294 | if (ret) | |
2295 | goto fail; | |
2296 | ||
39279cc3 | 2297 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2298 | if (ret) |
2299 | goto fail_commit; | |
39279cc3 | 2300 | |
58176a96 | 2301 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2302 | BUG_ON(!new_root); |
2303 | ||
2304 | trans = btrfs_start_transaction(new_root, 1); | |
2305 | BUG_ON(!trans); | |
2306 | ||
2307 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2308 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2309 | if (IS_ERR(inode)) |
2310 | goto fail; | |
39279cc3 CM |
2311 | inode->i_op = &btrfs_dir_inode_operations; |
2312 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2313 | new_root->inode = inode; |
39279cc3 | 2314 | |
3954401f CM |
2315 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2316 | new_dirid); | |
39279cc3 | 2317 | inode->i_nlink = 1; |
3954401f | 2318 | inode->i_size = 0; |
39279cc3 | 2319 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2320 | if (ret) |
2321 | goto fail; | |
2322 | fail: | |
d3c2fdcf | 2323 | nr = trans->blocks_used; |
dc17ff8f | 2324 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2325 | if (err && !ret) |
2326 | ret = err; | |
2327 | fail_commit: | |
39279cc3 | 2328 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2329 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2330 | btrfs_throttle(root); |
54aa1f4d | 2331 | return ret; |
39279cc3 CM |
2332 | } |
2333 | ||
2334 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2335 | { | |
3063d29f | 2336 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2337 | struct btrfs_trans_handle *trans; |
39279cc3 | 2338 | int ret; |
54aa1f4d | 2339 | int err; |
1832a6d5 | 2340 | unsigned long nr = 0; |
39279cc3 CM |
2341 | |
2342 | if (!root->ref_cows) | |
2343 | return -EINVAL; | |
2344 | ||
2345 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2346 | ret = btrfs_check_free_space(root, 1, 0); |
2347 | if (ret) | |
2348 | goto fail_unlock; | |
2349 | ||
3063d29f CM |
2350 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2351 | if (!pending_snapshot) { | |
2352 | ret = -ENOMEM; | |
2353 | goto fail_unlock; | |
2354 | } | |
fb4bc1e0 | 2355 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2356 | if (!pending_snapshot->name) { |
2357 | ret = -ENOMEM; | |
2358 | kfree(pending_snapshot); | |
2359 | goto fail_unlock; | |
2360 | } | |
fb4bc1e0 Y |
2361 | memcpy(pending_snapshot->name, name, namelen); |
2362 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2363 | trans = btrfs_start_transaction(root, 1); |
2364 | BUG_ON(!trans); | |
3063d29f CM |
2365 | pending_snapshot->root = root; |
2366 | list_add(&pending_snapshot->list, | |
2367 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2368 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2369 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2370 | |
1832a6d5 | 2371 | fail_unlock: |
39279cc3 | 2372 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2373 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2374 | btrfs_throttle(root); |
54aa1f4d | 2375 | return ret; |
39279cc3 CM |
2376 | } |
2377 | ||
edbd8d4e | 2378 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2379 | struct file_ra_state *ra, struct file *file, |
2380 | pgoff_t offset, pgoff_t last_index) | |
2381 | { | |
2382 | pgoff_t req_size; | |
2383 | ||
2384 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2385 | req_size = last_index - offset + 1; | |
2386 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2387 | return offset; | |
2388 | #else | |
2389 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2390 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2391 | return offset + req_size; | |
2392 | #endif | |
2393 | } | |
2394 | ||
2395 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2396 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2397 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2398 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2399 | struct page *page; |
2400 | unsigned long last_index; | |
2401 | unsigned long ra_index = 0; | |
2402 | u64 page_start; | |
2403 | u64 page_end; | |
edbd8d4e CM |
2404 | u64 delalloc_start; |
2405 | u64 existing_delalloc; | |
86479a04 | 2406 | unsigned long i; |
1832a6d5 CM |
2407 | int ret; |
2408 | ||
2409 | mutex_lock(&root->fs_info->fs_mutex); | |
2410 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2411 | mutex_unlock(&root->fs_info->fs_mutex); | |
2412 | if (ret) | |
2413 | return -ENOSPC; | |
86479a04 CM |
2414 | |
2415 | mutex_lock(&inode->i_mutex); | |
2416 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2417 | for (i = 0; i <= last_index; i++) { | |
2418 | if (i == ra_index) { | |
edbd8d4e CM |
2419 | ra_index = btrfs_force_ra(inode->i_mapping, |
2420 | &file->f_ra, | |
2421 | file, ra_index, last_index); | |
86479a04 CM |
2422 | } |
2423 | page = grab_cache_page(inode->i_mapping, i); | |
2424 | if (!page) | |
2425 | goto out_unlock; | |
2426 | if (!PageUptodate(page)) { | |
2427 | btrfs_readpage(NULL, page); | |
2428 | lock_page(page); | |
2429 | if (!PageUptodate(page)) { | |
2430 | unlock_page(page); | |
2431 | page_cache_release(page); | |
2432 | goto out_unlock; | |
2433 | } | |
2434 | } | |
35ebb934 | 2435 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2436 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2437 | ||
d1310b2e | 2438 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
edbd8d4e CM |
2439 | delalloc_start = page_start; |
2440 | existing_delalloc = | |
d1310b2e | 2441 | count_range_bits(&BTRFS_I(inode)->io_tree, |
edbd8d4e CM |
2442 | &delalloc_start, page_end, |
2443 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
d1310b2e | 2444 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2445 | page_end, GFP_NOFS); |
edbd8d4e CM |
2446 | |
2447 | spin_lock(&root->fs_info->delalloc_lock); | |
2448 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - | |
2449 | existing_delalloc; | |
2450 | spin_unlock(&root->fs_info->delalloc_lock); | |
2451 | ||
d1310b2e | 2452 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2453 | set_page_dirty(page); |
2454 | unlock_page(page); | |
2455 | page_cache_release(page); | |
2456 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2457 | } | |
2458 | ||
2459 | out_unlock: | |
2460 | mutex_unlock(&inode->i_mutex); | |
2461 | return 0; | |
2462 | } | |
2463 | ||
edbd8d4e CM |
2464 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2465 | { | |
2466 | u64 new_size; | |
2467 | u64 old_size; | |
2468 | struct btrfs_ioctl_vol_args *vol_args; | |
2469 | struct btrfs_trans_handle *trans; | |
2470 | char *sizestr; | |
2471 | int ret = 0; | |
2472 | int namelen; | |
2473 | int mod = 0; | |
2474 | ||
2475 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2476 | ||
2477 | if (!vol_args) | |
2478 | return -ENOMEM; | |
2479 | ||
2480 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2481 | ret = -EFAULT; | |
2482 | goto out; | |
2483 | } | |
2484 | namelen = strlen(vol_args->name); | |
2485 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2486 | ret = -EINVAL; | |
2487 | goto out; | |
2488 | } | |
2489 | ||
2490 | sizestr = vol_args->name; | |
2491 | if (!strcmp(sizestr, "max")) | |
2492 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2493 | else { | |
2494 | if (sizestr[0] == '-') { | |
2495 | mod = -1; | |
2496 | sizestr++; | |
2497 | } else if (sizestr[0] == '+') { | |
2498 | mod = 1; | |
2499 | sizestr++; | |
2500 | } | |
2501 | new_size = btrfs_parse_size(sizestr); | |
2502 | if (new_size == 0) { | |
2503 | ret = -EINVAL; | |
2504 | goto out; | |
2505 | } | |
2506 | } | |
2507 | ||
2508 | mutex_lock(&root->fs_info->fs_mutex); | |
2509 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2510 | ||
2511 | if (mod < 0) { | |
2512 | if (new_size > old_size) { | |
2513 | ret = -EINVAL; | |
2514 | goto out_unlock; | |
2515 | } | |
2516 | new_size = old_size - new_size; | |
2517 | } else if (mod > 0) { | |
2518 | new_size = old_size + new_size; | |
2519 | } | |
2520 | ||
2521 | if (new_size < 256 * 1024 * 1024) { | |
2522 | ret = -EINVAL; | |
2523 | goto out_unlock; | |
2524 | } | |
2525 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2526 | ret = -EFBIG; | |
2527 | goto out_unlock; | |
2528 | } | |
f9ef6604 CM |
2529 | |
2530 | do_div(new_size, root->sectorsize); | |
2531 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2532 | |
2533 | printk("new size is %Lu\n", new_size); | |
2534 | if (new_size > old_size) { | |
2535 | trans = btrfs_start_transaction(root, 1); | |
2536 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2537 | btrfs_commit_transaction(trans, root); | |
2538 | } else { | |
2539 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2540 | } | |
2541 | ||
2542 | out_unlock: | |
2543 | mutex_unlock(&root->fs_info->fs_mutex); | |
2544 | out: | |
2545 | kfree(vol_args); | |
2546 | return ret; | |
2547 | } | |
2548 | ||
4313b399 CM |
2549 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2550 | void __user *arg) | |
39279cc3 | 2551 | { |
4aec2b52 | 2552 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2553 | struct btrfs_dir_item *di; |
39279cc3 CM |
2554 | struct btrfs_path *path; |
2555 | u64 root_dirid; | |
4aec2b52 CM |
2556 | int namelen; |
2557 | int ret; | |
39279cc3 | 2558 | |
4aec2b52 | 2559 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2560 | |
4aec2b52 CM |
2561 | if (!vol_args) |
2562 | return -ENOMEM; | |
2563 | ||
2564 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2565 | ret = -EFAULT; | |
2566 | goto out; | |
2567 | } | |
2568 | ||
2569 | namelen = strlen(vol_args->name); | |
2570 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2571 | ret = -EINVAL; | |
2572 | goto out; | |
2573 | } | |
2574 | if (strchr(vol_args->name, '/')) { | |
2575 | ret = -EINVAL; | |
2576 | goto out; | |
2577 | } | |
d03581f4 CH |
2578 | |
2579 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2580 | if (!path) { |
2581 | ret = -ENOMEM; | |
2582 | goto out; | |
2583 | } | |
d03581f4 CH |
2584 | |
2585 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2586 | mutex_lock(&root->fs_info->fs_mutex); | |
2587 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2588 | path, root_dirid, | |
4aec2b52 | 2589 | vol_args->name, namelen, 0); |
d03581f4 CH |
2590 | mutex_unlock(&root->fs_info->fs_mutex); |
2591 | btrfs_free_path(path); | |
4aec2b52 CM |
2592 | |
2593 | if (di && !IS_ERR(di)) { | |
2594 | ret = -EEXIST; | |
2595 | goto out; | |
2596 | } | |
2597 | ||
2598 | if (IS_ERR(di)) { | |
2599 | ret = PTR_ERR(di); | |
2600 | goto out; | |
2601 | } | |
d03581f4 CH |
2602 | |
2603 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2604 | ret = create_subvol(root, vol_args->name, namelen); |
2605 | else | |
2606 | ret = create_snapshot(root, vol_args->name, namelen); | |
2607 | out: | |
2608 | kfree(vol_args); | |
2609 | return ret; | |
d03581f4 CH |
2610 | } |
2611 | ||
2612 | static int btrfs_ioctl_defrag(struct file *file) | |
2613 | { | |
6da6abae | 2614 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2615 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2616 | ||
2617 | switch (inode->i_mode & S_IFMT) { | |
2618 | case S_IFDIR: | |
39279cc3 | 2619 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2620 | btrfs_defrag_root(root, 0); |
2621 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2622 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2623 | break; |
d03581f4 CH |
2624 | case S_IFREG: |
2625 | btrfs_defrag_file(file); | |
2626 | break; | |
2627 | } | |
2628 | ||
2629 | return 0; | |
2630 | } | |
6702ed49 | 2631 | |
d03581f4 CH |
2632 | long btrfs_ioctl(struct file *file, unsigned int |
2633 | cmd, unsigned long arg) | |
2634 | { | |
6da6abae | 2635 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2636 | |
2637 | switch (cmd) { | |
2638 | case BTRFS_IOC_SNAP_CREATE: | |
2639 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2640 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2641 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2642 | case BTRFS_IOC_RESIZE: |
2643 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2644 | } |
d03581f4 CH |
2645 | |
2646 | return -ENOTTY; | |
39279cc3 CM |
2647 | } |
2648 | ||
39279cc3 CM |
2649 | /* |
2650 | * Called inside transaction, so use GFP_NOFS | |
2651 | */ | |
2652 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2653 | { | |
2654 | struct btrfs_inode *ei; | |
2655 | ||
2656 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2657 | if (!ei) | |
2658 | return NULL; | |
15ee9bc7 | 2659 | ei->last_trans = 0; |
dc17ff8f | 2660 | ei->ordered_trans = 0; |
39279cc3 CM |
2661 | return &ei->vfs_inode; |
2662 | } | |
2663 | ||
2664 | void btrfs_destroy_inode(struct inode *inode) | |
2665 | { | |
2666 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2667 | WARN_ON(inode->i_data.nrpages); | |
2668 | ||
8c416c9e | 2669 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2670 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2671 | } | |
2672 | ||
44ec0b71 CM |
2673 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2674 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2675 | #else | |
39279cc3 CM |
2676 | static void init_once(void * foo, struct kmem_cache * cachep, |
2677 | unsigned long flags) | |
44ec0b71 | 2678 | #endif |
39279cc3 CM |
2679 | { |
2680 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2681 | ||
2682 | inode_init_once(&ei->vfs_inode); | |
2683 | } | |
2684 | ||
2685 | void btrfs_destroy_cachep(void) | |
2686 | { | |
2687 | if (btrfs_inode_cachep) | |
2688 | kmem_cache_destroy(btrfs_inode_cachep); | |
2689 | if (btrfs_trans_handle_cachep) | |
2690 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2691 | if (btrfs_transaction_cachep) | |
2692 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2693 | if (btrfs_bit_radix_cachep) | |
2694 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2695 | if (btrfs_path_cachep) | |
2696 | kmem_cache_destroy(btrfs_path_cachep); | |
2697 | } | |
2698 | ||
86479a04 | 2699 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2700 | unsigned long extra_flags, |
44ec0b71 CM |
2701 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2702 | void (*ctor)(struct kmem_cache *, void *) | |
2703 | #else | |
92fee66d | 2704 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2705 | unsigned long) |
2706 | #endif | |
2707 | ) | |
92fee66d CM |
2708 | { |
2709 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2710 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2711 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2712 | ,NULL | |
2713 | #endif | |
2714 | ); | |
2715 | } | |
2716 | ||
39279cc3 CM |
2717 | int btrfs_init_cachep(void) |
2718 | { | |
86479a04 | 2719 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2720 | sizeof(struct btrfs_inode), |
2721 | 0, init_once); | |
39279cc3 CM |
2722 | if (!btrfs_inode_cachep) |
2723 | goto fail; | |
86479a04 CM |
2724 | btrfs_trans_handle_cachep = |
2725 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2726 | sizeof(struct btrfs_trans_handle), | |
2727 | 0, NULL); | |
39279cc3 CM |
2728 | if (!btrfs_trans_handle_cachep) |
2729 | goto fail; | |
86479a04 | 2730 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2731 | sizeof(struct btrfs_transaction), |
92fee66d | 2732 | 0, NULL); |
39279cc3 CM |
2733 | if (!btrfs_transaction_cachep) |
2734 | goto fail; | |
86479a04 | 2735 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2736 | sizeof(struct btrfs_path), |
92fee66d | 2737 | 0, NULL); |
39279cc3 CM |
2738 | if (!btrfs_path_cachep) |
2739 | goto fail; | |
86479a04 | 2740 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2741 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2742 | if (!btrfs_bit_radix_cachep) |
2743 | goto fail; | |
2744 | return 0; | |
2745 | fail: | |
2746 | btrfs_destroy_cachep(); | |
2747 | return -ENOMEM; | |
2748 | } | |
2749 | ||
2750 | static int btrfs_getattr(struct vfsmount *mnt, | |
2751 | struct dentry *dentry, struct kstat *stat) | |
2752 | { | |
2753 | struct inode *inode = dentry->d_inode; | |
2754 | generic_fillattr(inode, stat); | |
d6667462 | 2755 | stat->blksize = PAGE_CACHE_SIZE; |
39279cc3 CM |
2756 | return 0; |
2757 | } | |
2758 | ||
2759 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2760 | struct inode * new_dir,struct dentry *new_dentry) | |
2761 | { | |
2762 | struct btrfs_trans_handle *trans; | |
2763 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2764 | struct inode *new_inode = new_dentry->d_inode; | |
2765 | struct inode *old_inode = old_dentry->d_inode; | |
2766 | struct timespec ctime = CURRENT_TIME; | |
2767 | struct btrfs_path *path; | |
39279cc3 CM |
2768 | int ret; |
2769 | ||
2770 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2771 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2772 | return -ENOTEMPTY; | |
2773 | } | |
5f39d397 | 2774 | |
39279cc3 | 2775 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2776 | ret = btrfs_check_free_space(root, 1, 0); |
2777 | if (ret) | |
2778 | goto out_unlock; | |
2779 | ||
39279cc3 | 2780 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2781 | |
39279cc3 CM |
2782 | btrfs_set_trans_block_group(trans, new_dir); |
2783 | path = btrfs_alloc_path(); | |
2784 | if (!path) { | |
2785 | ret = -ENOMEM; | |
2786 | goto out_fail; | |
2787 | } | |
2788 | ||
2789 | old_dentry->d_inode->i_nlink++; | |
2790 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2791 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2792 | old_inode->i_ctime = ctime; | |
5f39d397 | 2793 | |
39279cc3 CM |
2794 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2795 | if (ret) | |
2796 | goto out_fail; | |
2797 | ||
2798 | if (new_inode) { | |
2799 | new_inode->i_ctime = CURRENT_TIME; | |
2800 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2801 | if (ret) | |
2802 | goto out_fail; | |
39279cc3 CM |
2803 | } |
2804 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2805 | if (ret) | |
2806 | goto out_fail; | |
2807 | ||
2808 | out_fail: | |
2809 | btrfs_free_path(path); | |
2810 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2811 | out_unlock: |
39279cc3 CM |
2812 | mutex_unlock(&root->fs_info->fs_mutex); |
2813 | return ret; | |
2814 | } | |
2815 | ||
2816 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2817 | const char *symname) | |
2818 | { | |
2819 | struct btrfs_trans_handle *trans; | |
2820 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2821 | struct btrfs_path *path; | |
2822 | struct btrfs_key key; | |
1832a6d5 | 2823 | struct inode *inode = NULL; |
39279cc3 CM |
2824 | int err; |
2825 | int drop_inode = 0; | |
2826 | u64 objectid; | |
2827 | int name_len; | |
2828 | int datasize; | |
5f39d397 | 2829 | unsigned long ptr; |
39279cc3 | 2830 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2831 | struct extent_buffer *leaf; |
1832a6d5 | 2832 | unsigned long nr = 0; |
39279cc3 CM |
2833 | |
2834 | name_len = strlen(symname) + 1; | |
2835 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2836 | return -ENAMETOOLONG; | |
1832a6d5 | 2837 | |
39279cc3 | 2838 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2839 | err = btrfs_check_free_space(root, 1, 0); |
2840 | if (err) | |
2841 | goto out_fail; | |
2842 | ||
39279cc3 CM |
2843 | trans = btrfs_start_transaction(root, 1); |
2844 | btrfs_set_trans_block_group(trans, dir); | |
2845 | ||
2846 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2847 | if (err) { | |
2848 | err = -ENOSPC; | |
2849 | goto out_unlock; | |
2850 | } | |
2851 | ||
2852 | inode = btrfs_new_inode(trans, root, objectid, | |
2853 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2854 | err = PTR_ERR(inode); | |
2855 | if (IS_ERR(inode)) | |
2856 | goto out_unlock; | |
2857 | ||
2858 | btrfs_set_trans_block_group(trans, inode); | |
2859 | err = btrfs_add_nondir(trans, dentry, inode); | |
2860 | if (err) | |
2861 | drop_inode = 1; | |
2862 | else { | |
2863 | inode->i_mapping->a_ops = &btrfs_aops; | |
2864 | inode->i_fop = &btrfs_file_operations; | |
2865 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2866 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2867 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2868 | inode->i_mapping, GFP_NOFS); |
d1310b2e | 2869 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2870 | } |
2871 | dir->i_sb->s_dirt = 1; | |
2872 | btrfs_update_inode_block_group(trans, inode); | |
2873 | btrfs_update_inode_block_group(trans, dir); | |
2874 | if (drop_inode) | |
2875 | goto out_unlock; | |
2876 | ||
2877 | path = btrfs_alloc_path(); | |
2878 | BUG_ON(!path); | |
2879 | key.objectid = inode->i_ino; | |
2880 | key.offset = 0; | |
39279cc3 CM |
2881 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2882 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2883 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2884 | datasize); | |
54aa1f4d CM |
2885 | if (err) { |
2886 | drop_inode = 1; | |
2887 | goto out_unlock; | |
2888 | } | |
5f39d397 CM |
2889 | leaf = path->nodes[0]; |
2890 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2891 | struct btrfs_file_extent_item); | |
2892 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2893 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2894 | BTRFS_FILE_EXTENT_INLINE); |
2895 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2896 | write_extent_buffer(leaf, symname, ptr, name_len); |
2897 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2898 | btrfs_free_path(path); |
5f39d397 | 2899 | |
39279cc3 CM |
2900 | inode->i_op = &btrfs_symlink_inode_operations; |
2901 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2902 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2903 | err = btrfs_update_inode(trans, root, inode); |
2904 | if (err) | |
2905 | drop_inode = 1; | |
39279cc3 CM |
2906 | |
2907 | out_unlock: | |
d3c2fdcf | 2908 | nr = trans->blocks_used; |
39279cc3 | 2909 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2910 | out_fail: |
39279cc3 | 2911 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2912 | if (drop_inode) { |
2913 | inode_dec_link_count(inode); | |
2914 | iput(inode); | |
2915 | } | |
d3c2fdcf | 2916 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2917 | btrfs_throttle(root); |
39279cc3 CM |
2918 | return err; |
2919 | } | |
fdebe2bd Y |
2920 | static int btrfs_permission(struct inode *inode, int mask, |
2921 | struct nameidata *nd) | |
2922 | { | |
2923 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
2924 | return -EACCES; | |
2925 | return generic_permission(inode, mask, NULL); | |
2926 | } | |
39279cc3 CM |
2927 | |
2928 | static struct inode_operations btrfs_dir_inode_operations = { | |
2929 | .lookup = btrfs_lookup, | |
2930 | .create = btrfs_create, | |
2931 | .unlink = btrfs_unlink, | |
2932 | .link = btrfs_link, | |
2933 | .mkdir = btrfs_mkdir, | |
2934 | .rmdir = btrfs_rmdir, | |
2935 | .rename = btrfs_rename, | |
2936 | .symlink = btrfs_symlink, | |
2937 | .setattr = btrfs_setattr, | |
618e21d5 | 2938 | .mknod = btrfs_mknod, |
5103e947 JB |
2939 | .setxattr = generic_setxattr, |
2940 | .getxattr = generic_getxattr, | |
2941 | .listxattr = btrfs_listxattr, | |
2942 | .removexattr = generic_removexattr, | |
fdebe2bd | 2943 | .permission = btrfs_permission, |
39279cc3 | 2944 | }; |
39279cc3 CM |
2945 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2946 | .lookup = btrfs_lookup, | |
fdebe2bd | 2947 | .permission = btrfs_permission, |
39279cc3 | 2948 | }; |
39279cc3 CM |
2949 | static struct file_operations btrfs_dir_file_operations = { |
2950 | .llseek = generic_file_llseek, | |
2951 | .read = generic_read_dir, | |
2952 | .readdir = btrfs_readdir, | |
34287aa3 | 2953 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2954 | #ifdef CONFIG_COMPAT |
34287aa3 | 2955 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2956 | #endif |
2957 | }; | |
2958 | ||
d1310b2e | 2959 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac CM |
2960 | .fill_delalloc = run_delalloc_range, |
2961 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2962 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2963 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2964 | }; | |
2965 | ||
39279cc3 CM |
2966 | static struct address_space_operations btrfs_aops = { |
2967 | .readpage = btrfs_readpage, | |
2968 | .writepage = btrfs_writepage, | |
b293f02e | 2969 | .writepages = btrfs_writepages, |
3ab2fb5a | 2970 | .readpages = btrfs_readpages, |
39279cc3 | 2971 | .sync_page = block_sync_page, |
39279cc3 | 2972 | .bmap = btrfs_bmap, |
a52d9a80 CM |
2973 | .invalidatepage = btrfs_invalidatepage, |
2974 | .releasepage = btrfs_releasepage, | |
2975 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2976 | }; |
2977 | ||
2978 | static struct address_space_operations btrfs_symlink_aops = { | |
2979 | .readpage = btrfs_readpage, | |
2980 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2981 | .invalidatepage = btrfs_invalidatepage, |
2982 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2983 | }; |
2984 | ||
2985 | static struct inode_operations btrfs_file_inode_operations = { | |
2986 | .truncate = btrfs_truncate, | |
2987 | .getattr = btrfs_getattr, | |
2988 | .setattr = btrfs_setattr, | |
5103e947 JB |
2989 | .setxattr = generic_setxattr, |
2990 | .getxattr = generic_getxattr, | |
2991 | .listxattr = btrfs_listxattr, | |
2992 | .removexattr = generic_removexattr, | |
fdebe2bd | 2993 | .permission = btrfs_permission, |
39279cc3 | 2994 | }; |
618e21d5 JB |
2995 | static struct inode_operations btrfs_special_inode_operations = { |
2996 | .getattr = btrfs_getattr, | |
2997 | .setattr = btrfs_setattr, | |
fdebe2bd | 2998 | .permission = btrfs_permission, |
618e21d5 | 2999 | }; |
39279cc3 CM |
3000 | static struct inode_operations btrfs_symlink_inode_operations = { |
3001 | .readlink = generic_readlink, | |
3002 | .follow_link = page_follow_link_light, | |
3003 | .put_link = page_put_link, | |
fdebe2bd | 3004 | .permission = btrfs_permission, |
39279cc3 | 3005 | }; |