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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 56 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
57 | |
58 | static struct kmem_cache *btrfs_inode_cachep; | |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | |
60 | struct kmem_cache *btrfs_transaction_cachep; | |
61 | struct kmem_cache *btrfs_bit_radix_cachep; | |
62 | struct kmem_cache *btrfs_path_cachep; | |
63 | ||
64 | #define S_SHIFT 12 | |
65 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
66 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
67 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
68 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
69 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
70 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
71 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
72 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
73 | }; | |
74 | ||
b888db2b CM |
75 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) |
76 | { | |
77 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
78 | struct btrfs_trans_handle *trans; | |
79 | struct btrfs_key ins; | |
80 | u64 alloc_hint = 0; | |
db94535d | 81 | u64 num_bytes; |
b888db2b | 82 | int ret; |
db94535d | 83 | u64 blocksize = root->sectorsize; |
b888db2b CM |
84 | |
85 | mutex_lock(&root->fs_info->fs_mutex); | |
86 | trans = btrfs_start_transaction(root, 1); | |
87 | btrfs_set_trans_block_group(trans, inode); | |
88 | BUG_ON(!trans); | |
db94535d | 89 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
b888db2b | 90 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 91 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 92 | |
179e29e4 CM |
93 | if (alloc_hint == EXTENT_MAP_INLINE) |
94 | goto out; | |
95 | ||
db94535d | 96 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0, |
b888db2b CM |
97 | alloc_hint, (u64)-1, &ins, 1); |
98 | if (ret) { | |
99 | WARN_ON(1); | |
100 | goto out; | |
101 | } | |
102 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
103 | start, ins.objectid, ins.offset, | |
104 | ins.offset); | |
105 | out: | |
106 | btrfs_end_transaction(trans, root); | |
107 | mutex_unlock(&root->fs_info->fs_mutex); | |
108 | return ret; | |
109 | } | |
110 | ||
07157aac CM |
111 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
112 | { | |
113 | struct inode *inode = page->mapping->host; | |
114 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
115 | struct btrfs_trans_handle *trans; | |
116 | char *kaddr; | |
117 | int ret; | |
35ebb934 | 118 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
119 | size_t offset = start - page_start; |
120 | ||
121 | mutex_lock(&root->fs_info->fs_mutex); | |
122 | trans = btrfs_start_transaction(root, 1); | |
123 | btrfs_set_trans_block_group(trans, inode); | |
124 | kaddr = kmap(page); | |
f578d4bd | 125 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
126 | start, kaddr + offset, end - start + 1); |
127 | kunmap(page); | |
128 | ret = btrfs_end_transaction(trans, root); | |
129 | BUG_ON(ret); | |
130 | mutex_unlock(&root->fs_info->fs_mutex); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
135 | { | |
136 | int ret = 0; | |
137 | struct inode *inode = page->mapping->host; | |
138 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
139 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
140 | struct btrfs_csum_item *item; | |
141 | struct btrfs_path *path = NULL; | |
ff79f819 | 142 | u32 csum; |
07157aac CM |
143 | |
144 | mutex_lock(&root->fs_info->fs_mutex); | |
145 | path = btrfs_alloc_path(); | |
146 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
147 | if (IS_ERR(item)) { | |
148 | ret = PTR_ERR(item); | |
149 | /* a csum that isn't present is a preallocated region. */ | |
150 | if (ret == -ENOENT || ret == -EFBIG) | |
151 | ret = 0; | |
ff79f819 | 152 | csum = 0; |
07157aac CM |
153 | goto out; |
154 | } | |
ff79f819 CM |
155 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
156 | BTRFS_CRC32_SIZE); | |
157 | set_state_private(em_tree, start, csum); | |
07157aac CM |
158 | out: |
159 | if (path) | |
160 | btrfs_free_path(path); | |
161 | mutex_unlock(&root->fs_info->fs_mutex); | |
162 | return ret; | |
163 | } | |
164 | ||
165 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
166 | { | |
35ebb934 | 167 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 168 | struct inode *inode = page->mapping->host; |
07157aac CM |
169 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
170 | char *kaddr; | |
171 | u64 private; | |
172 | int ret; | |
ff79f819 CM |
173 | struct btrfs_root *root = BTRFS_I(inode)->root; |
174 | u32 csum = ~(u32)0; | |
bbf0d006 | 175 | unsigned long flags; |
07157aac CM |
176 | |
177 | ret = get_state_private(em_tree, start, &private); | |
bbf0d006 | 178 | local_irq_save(flags); |
07157aac CM |
179 | kaddr = kmap_atomic(page, KM_IRQ0); |
180 | if (ret) { | |
181 | goto zeroit; | |
182 | } | |
ff79f819 CM |
183 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
184 | btrfs_csum_final(csum, (char *)&csum); | |
185 | if (csum != private) { | |
07157aac CM |
186 | goto zeroit; |
187 | } | |
188 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 189 | local_irq_restore(flags); |
07157aac CM |
190 | return 0; |
191 | ||
192 | zeroit: | |
193 | printk("btrfs csum failed ino %lu off %llu\n", | |
194 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
195 | memset(kaddr + offset, 1, end - start + 1); |
196 | flush_dcache_page(page); | |
07157aac | 197 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 198 | local_irq_restore(flags); |
07157aac CM |
199 | return 0; |
200 | } | |
b888db2b | 201 | |
39279cc3 CM |
202 | void btrfs_read_locked_inode(struct inode *inode) |
203 | { | |
204 | struct btrfs_path *path; | |
5f39d397 | 205 | struct extent_buffer *leaf; |
39279cc3 | 206 | struct btrfs_inode_item *inode_item; |
5f39d397 | 207 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
208 | struct btrfs_root *root = BTRFS_I(inode)->root; |
209 | struct btrfs_key location; | |
210 | u64 alloc_group_block; | |
618e21d5 | 211 | u32 rdev; |
39279cc3 CM |
212 | int ret; |
213 | ||
214 | path = btrfs_alloc_path(); | |
215 | BUG_ON(!path); | |
39279cc3 CM |
216 | mutex_lock(&root->fs_info->fs_mutex); |
217 | ||
218 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
219 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 220 | if (ret) |
39279cc3 | 221 | goto make_bad; |
39279cc3 | 222 | |
5f39d397 CM |
223 | leaf = path->nodes[0]; |
224 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
225 | struct btrfs_inode_item); | |
226 | ||
227 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
228 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
229 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
230 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
231 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
232 | ||
233 | tspec = btrfs_inode_atime(inode_item); | |
234 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
235 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
236 | ||
237 | tspec = btrfs_inode_mtime(inode_item); | |
238 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
239 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
240 | ||
241 | tspec = btrfs_inode_ctime(inode_item); | |
242 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
243 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
244 | ||
245 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
246 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 247 | inode->i_rdev = 0; |
5f39d397 CM |
248 | rdev = btrfs_inode_rdev(leaf, inode_item); |
249 | ||
250 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
251 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
252 | alloc_group_block); | |
253 | ||
254 | btrfs_free_path(path); | |
255 | inode_item = NULL; | |
256 | ||
257 | mutex_unlock(&root->fs_info->fs_mutex); | |
258 | ||
259 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
260 | case S_IFREG: |
261 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 262 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
263 | inode->i_fop = &btrfs_file_operations; |
264 | inode->i_op = &btrfs_file_inode_operations; | |
265 | break; | |
266 | case S_IFDIR: | |
267 | inode->i_fop = &btrfs_dir_file_operations; | |
268 | if (root == root->fs_info->tree_root) | |
269 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
270 | else | |
271 | inode->i_op = &btrfs_dir_inode_operations; | |
272 | break; | |
273 | case S_IFLNK: | |
274 | inode->i_op = &btrfs_symlink_inode_operations; | |
275 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
276 | break; | |
618e21d5 JB |
277 | default: |
278 | init_special_inode(inode, inode->i_mode, rdev); | |
279 | break; | |
39279cc3 CM |
280 | } |
281 | return; | |
282 | ||
283 | make_bad: | |
284 | btrfs_release_path(root, path); | |
285 | btrfs_free_path(path); | |
286 | mutex_unlock(&root->fs_info->fs_mutex); | |
287 | make_bad_inode(inode); | |
288 | } | |
289 | ||
5f39d397 CM |
290 | static void fill_inode_item(struct extent_buffer *leaf, |
291 | struct btrfs_inode_item *item, | |
39279cc3 CM |
292 | struct inode *inode) |
293 | { | |
5f39d397 CM |
294 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
295 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
296 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
297 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
298 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
299 | ||
300 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
301 | inode->i_atime.tv_sec); | |
302 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
303 | inode->i_atime.tv_nsec); | |
304 | ||
305 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
306 | inode->i_mtime.tv_sec); | |
307 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
308 | inode->i_mtime.tv_nsec); | |
309 | ||
310 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
311 | inode->i_ctime.tv_sec); | |
312 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
313 | inode->i_ctime.tv_nsec); | |
314 | ||
315 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
316 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
317 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
318 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
319 | BTRFS_I(inode)->block_group->key.objectid); |
320 | } | |
321 | ||
a52d9a80 | 322 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
323 | struct btrfs_root *root, |
324 | struct inode *inode) | |
325 | { | |
326 | struct btrfs_inode_item *inode_item; | |
327 | struct btrfs_path *path; | |
5f39d397 | 328 | struct extent_buffer *leaf; |
39279cc3 CM |
329 | int ret; |
330 | ||
331 | path = btrfs_alloc_path(); | |
332 | BUG_ON(!path); | |
39279cc3 CM |
333 | ret = btrfs_lookup_inode(trans, root, path, |
334 | &BTRFS_I(inode)->location, 1); | |
335 | if (ret) { | |
336 | if (ret > 0) | |
337 | ret = -ENOENT; | |
338 | goto failed; | |
339 | } | |
340 | ||
5f39d397 CM |
341 | leaf = path->nodes[0]; |
342 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
343 | struct btrfs_inode_item); |
344 | ||
5f39d397 CM |
345 | fill_inode_item(leaf, inode_item, inode); |
346 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 347 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
348 | ret = 0; |
349 | failed: | |
350 | btrfs_release_path(root, path); | |
351 | btrfs_free_path(path); | |
352 | return ret; | |
353 | } | |
354 | ||
355 | ||
356 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
357 | struct btrfs_root *root, | |
358 | struct inode *dir, | |
359 | struct dentry *dentry) | |
360 | { | |
361 | struct btrfs_path *path; | |
362 | const char *name = dentry->d_name.name; | |
363 | int name_len = dentry->d_name.len; | |
364 | int ret = 0; | |
5f39d397 | 365 | struct extent_buffer *leaf; |
39279cc3 | 366 | struct btrfs_dir_item *di; |
5f39d397 | 367 | struct btrfs_key key; |
39279cc3 CM |
368 | |
369 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
370 | if (!path) { |
371 | ret = -ENOMEM; | |
372 | goto err; | |
373 | } | |
374 | ||
39279cc3 CM |
375 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
376 | name, name_len, -1); | |
377 | if (IS_ERR(di)) { | |
378 | ret = PTR_ERR(di); | |
379 | goto err; | |
380 | } | |
381 | if (!di) { | |
382 | ret = -ENOENT; | |
383 | goto err; | |
384 | } | |
5f39d397 CM |
385 | leaf = path->nodes[0]; |
386 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 387 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
388 | if (ret) |
389 | goto err; | |
39279cc3 CM |
390 | btrfs_release_path(root, path); |
391 | ||
392 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 393 | key.objectid, name, name_len, -1); |
39279cc3 CM |
394 | if (IS_ERR(di)) { |
395 | ret = PTR_ERR(di); | |
396 | goto err; | |
397 | } | |
398 | if (!di) { | |
399 | ret = -ENOENT; | |
400 | goto err; | |
401 | } | |
402 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
403 | |
404 | dentry->d_inode->i_ctime = dir->i_ctime; | |
405 | err: | |
406 | btrfs_free_path(path); | |
407 | if (!ret) { | |
408 | dir->i_size -= name_len * 2; | |
79c44584 | 409 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
410 | btrfs_update_inode(trans, root, dir); |
411 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 412 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
413 | dir->i_sb->s_dirt = 1; |
414 | } | |
415 | return ret; | |
416 | } | |
417 | ||
418 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
419 | { | |
420 | struct btrfs_root *root; | |
421 | struct btrfs_trans_handle *trans; | |
422 | int ret; | |
d3c2fdcf | 423 | unsigned long nr; |
39279cc3 CM |
424 | |
425 | root = BTRFS_I(dir)->root; | |
426 | mutex_lock(&root->fs_info->fs_mutex); | |
427 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 428 | |
39279cc3 CM |
429 | btrfs_set_trans_block_group(trans, dir); |
430 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 431 | nr = trans->blocks_used; |
5f39d397 | 432 | |
39279cc3 CM |
433 | btrfs_end_transaction(trans, root); |
434 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 435 | btrfs_btree_balance_dirty(root, nr); |
5f39d397 | 436 | |
39279cc3 CM |
437 | return ret; |
438 | } | |
439 | ||
440 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
441 | { | |
442 | struct inode *inode = dentry->d_inode; | |
443 | int err; | |
444 | int ret; | |
445 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
446 | struct btrfs_path *path; | |
447 | struct btrfs_key key; | |
448 | struct btrfs_trans_handle *trans; | |
449 | struct btrfs_key found_key; | |
450 | int found_type; | |
5f39d397 | 451 | struct extent_buffer *leaf; |
39279cc3 | 452 | char *goodnames = ".."; |
d3c2fdcf | 453 | unsigned long nr; |
39279cc3 | 454 | |
134d4512 Y |
455 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
456 | return -ENOTEMPTY; | |
457 | ||
39279cc3 CM |
458 | path = btrfs_alloc_path(); |
459 | BUG_ON(!path); | |
39279cc3 CM |
460 | mutex_lock(&root->fs_info->fs_mutex); |
461 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 462 | |
39279cc3 CM |
463 | btrfs_set_trans_block_group(trans, dir); |
464 | key.objectid = inode->i_ino; | |
465 | key.offset = (u64)-1; | |
5f39d397 | 466 | key.type = (u8)-1; |
39279cc3 CM |
467 | while(1) { |
468 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
469 | if (ret < 0) { | |
470 | err = ret; | |
471 | goto out; | |
472 | } | |
473 | BUG_ON(ret == 0); | |
474 | if (path->slots[0] == 0) { | |
475 | err = -ENOENT; | |
476 | goto out; | |
477 | } | |
478 | path->slots[0]--; | |
5f39d397 CM |
479 | leaf = path->nodes[0]; |
480 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
39279cc3 CM |
481 | found_type = btrfs_key_type(&found_key); |
482 | if (found_key.objectid != inode->i_ino) { | |
483 | err = -ENOENT; | |
484 | goto out; | |
485 | } | |
486 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
487 | found_type != BTRFS_DIR_INDEX_KEY) || | |
488 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
489 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
490 | err = -ENOTEMPTY; | |
491 | goto out; | |
492 | } | |
493 | ret = btrfs_del_item(trans, root, path); | |
494 | BUG_ON(ret); | |
495 | ||
496 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) | |
497 | break; | |
498 | btrfs_release_path(root, path); | |
499 | } | |
500 | ret = 0; | |
501 | btrfs_release_path(root, path); | |
502 | ||
503 | /* now the directory is empty */ | |
504 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
505 | if (!err) { | |
506 | inode->i_size = 0; | |
507 | } | |
508 | out: | |
509 | btrfs_release_path(root, path); | |
510 | btrfs_free_path(path); | |
d3c2fdcf | 511 | nr = trans->blocks_used; |
39279cc3 | 512 | ret = btrfs_end_transaction(trans, root); |
134d4512 | 513 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 514 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
515 | if (ret && !err) |
516 | err = ret; | |
517 | return err; | |
518 | } | |
519 | ||
520 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
521 | struct btrfs_root *root, | |
522 | struct inode *inode) | |
523 | { | |
524 | struct btrfs_path *path; | |
525 | int ret; | |
526 | ||
527 | clear_inode(inode); | |
528 | ||
529 | path = btrfs_alloc_path(); | |
530 | BUG_ON(!path); | |
39279cc3 CM |
531 | ret = btrfs_lookup_inode(trans, root, path, |
532 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
533 | if (ret > 0) |
534 | ret = -ENOENT; | |
535 | if (!ret) | |
536 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
537 | btrfs_free_path(path); |
538 | return ret; | |
539 | } | |
540 | ||
39279cc3 CM |
541 | /* |
542 | * this can truncate away extent items, csum items and directory items. | |
543 | * It starts at a high offset and removes keys until it can't find | |
544 | * any higher than i_size. | |
545 | * | |
546 | * csum items that cross the new i_size are truncated to the new size | |
547 | * as well. | |
548 | */ | |
549 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
550 | struct btrfs_root *root, | |
551 | struct inode *inode) | |
552 | { | |
553 | int ret; | |
554 | struct btrfs_path *path; | |
555 | struct btrfs_key key; | |
5f39d397 | 556 | struct btrfs_key found_key; |
39279cc3 | 557 | u32 found_type; |
5f39d397 | 558 | struct extent_buffer *leaf; |
39279cc3 CM |
559 | struct btrfs_file_extent_item *fi; |
560 | u64 extent_start = 0; | |
db94535d | 561 | u64 extent_num_bytes = 0; |
39279cc3 CM |
562 | u64 item_end = 0; |
563 | int found_extent; | |
564 | int del_item; | |
179e29e4 | 565 | int extent_type = -1; |
39279cc3 | 566 | |
a52d9a80 | 567 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 568 | path = btrfs_alloc_path(); |
3c69faec | 569 | path->reada = -1; |
39279cc3 | 570 | BUG_ON(!path); |
5f39d397 | 571 | |
39279cc3 CM |
572 | /* FIXME, add redo link to tree so we don't leak on crash */ |
573 | key.objectid = inode->i_ino; | |
574 | key.offset = (u64)-1; | |
5f39d397 CM |
575 | key.type = (u8)-1; |
576 | ||
39279cc3 CM |
577 | while(1) { |
578 | btrfs_init_path(path); | |
579 | fi = NULL; | |
580 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
581 | if (ret < 0) { | |
582 | goto error; | |
583 | } | |
584 | if (ret > 0) { | |
585 | BUG_ON(path->slots[0] == 0); | |
586 | path->slots[0]--; | |
587 | } | |
5f39d397 CM |
588 | leaf = path->nodes[0]; |
589 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
590 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 591 | |
5f39d397 | 592 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 593 | break; |
5f39d397 | 594 | |
39279cc3 CM |
595 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
596 | found_type != BTRFS_DIR_ITEM_KEY && | |
597 | found_type != BTRFS_DIR_INDEX_KEY && | |
598 | found_type != BTRFS_EXTENT_DATA_KEY) | |
599 | break; | |
600 | ||
5f39d397 | 601 | item_end = found_key.offset; |
39279cc3 | 602 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 603 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 604 | struct btrfs_file_extent_item); |
179e29e4 CM |
605 | extent_type = btrfs_file_extent_type(leaf, fi); |
606 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 607 | item_end += |
db94535d | 608 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
609 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
610 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
611 | path->slots[0]); | |
612 | item_end += btrfs_file_extent_inline_len(leaf, | |
613 | item); | |
39279cc3 | 614 | } |
008630c1 | 615 | item_end--; |
39279cc3 CM |
616 | } |
617 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
618 | ret = btrfs_csum_truncate(trans, root, path, | |
619 | inode->i_size); | |
620 | BUG_ON(ret); | |
621 | } | |
008630c1 | 622 | if (item_end < inode->i_size) { |
b888db2b CM |
623 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
624 | found_type = BTRFS_INODE_ITEM_KEY; | |
625 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
626 | found_type = BTRFS_CSUM_ITEM_KEY; | |
627 | } else if (found_type) { | |
628 | found_type--; | |
629 | } else { | |
630 | break; | |
39279cc3 | 631 | } |
a61721d5 | 632 | btrfs_set_key_type(&key, found_type); |
65555a06 | 633 | btrfs_release_path(root, path); |
b888db2b | 634 | continue; |
39279cc3 | 635 | } |
5f39d397 | 636 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
637 | del_item = 1; |
638 | else | |
639 | del_item = 0; | |
640 | found_extent = 0; | |
641 | ||
642 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
643 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
644 | goto delete; | |
645 | ||
646 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 647 | u64 num_dec; |
db94535d | 648 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 649 | if (!del_item) { |
db94535d CM |
650 | u64 orig_num_bytes = |
651 | btrfs_file_extent_num_bytes(leaf, fi); | |
652 | extent_num_bytes = inode->i_size - | |
5f39d397 | 653 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
654 | btrfs_set_file_extent_num_bytes(leaf, fi, |
655 | extent_num_bytes); | |
656 | num_dec = (orig_num_bytes - | |
657 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
658 | if (extent_start != 0) { |
659 | inode->i_blocks -= num_dec; | |
660 | } | |
5f39d397 | 661 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 662 | } else { |
db94535d CM |
663 | extent_num_bytes = |
664 | btrfs_file_extent_disk_num_bytes(leaf, | |
665 | fi); | |
39279cc3 | 666 | /* FIXME blocksize != 4096 */ |
db94535d CM |
667 | num_dec = btrfs_file_extent_num_bytes(leaf, |
668 | fi) >> 9; | |
39279cc3 CM |
669 | if (extent_start != 0) { |
670 | found_extent = 1; | |
671 | inode->i_blocks -= num_dec; | |
672 | } | |
673 | } | |
179e29e4 CM |
674 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
675 | !del_item) { | |
676 | u32 newsize = inode->i_size - found_key.offset; | |
677 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
678 | ret = btrfs_truncate_item(trans, root, path, | |
679 | newsize, 1); | |
680 | BUG_ON(ret); | |
39279cc3 | 681 | } |
179e29e4 | 682 | delete: |
39279cc3 CM |
683 | if (del_item) { |
684 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
685 | if (ret) |
686 | goto error; | |
39279cc3 CM |
687 | } else { |
688 | break; | |
689 | } | |
690 | btrfs_release_path(root, path); | |
691 | if (found_extent) { | |
692 | ret = btrfs_free_extent(trans, root, extent_start, | |
db94535d | 693 | extent_num_bytes, 0); |
39279cc3 CM |
694 | BUG_ON(ret); |
695 | } | |
696 | } | |
697 | ret = 0; | |
698 | error: | |
699 | btrfs_release_path(root, path); | |
700 | btrfs_free_path(path); | |
701 | inode->i_sb->s_dirt = 1; | |
702 | return ret; | |
703 | } | |
704 | ||
b888db2b | 705 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
706 | size_t zero_start) |
707 | { | |
708 | char *kaddr; | |
709 | int ret = 0; | |
b888db2b | 710 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
35ebb934 | 711 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 712 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 | 713 | |
b3cfa35a | 714 | set_page_extent_mapped(page); |
a52d9a80 | 715 | |
b888db2b CM |
716 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
717 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
718 | page_end, GFP_NOFS); | |
a52d9a80 | 719 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 720 | kaddr = kmap(page); |
a52d9a80 CM |
721 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
722 | flush_dcache_page(page); | |
b888db2b | 723 | kunmap(page); |
a52d9a80 | 724 | } |
b888db2b CM |
725 | set_page_dirty(page); |
726 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 727 | |
a52d9a80 CM |
728 | return ret; |
729 | } | |
730 | ||
39279cc3 CM |
731 | /* |
732 | * taken from block_truncate_page, but does cow as it zeros out | |
733 | * any bytes left in the last page in the file. | |
734 | */ | |
735 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
736 | { | |
737 | struct inode *inode = mapping->host; | |
db94535d CM |
738 | struct btrfs_root *root = BTRFS_I(inode)->root; |
739 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
740 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
741 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
742 | struct page *page; | |
39279cc3 | 743 | int ret = 0; |
a52d9a80 | 744 | u64 page_start; |
39279cc3 CM |
745 | |
746 | if ((offset & (blocksize - 1)) == 0) | |
747 | goto out; | |
748 | ||
db94535d | 749 | down_read(&root->snap_sem); |
39279cc3 CM |
750 | ret = -ENOMEM; |
751 | page = grab_cache_page(mapping, index); | |
752 | if (!page) | |
753 | goto out; | |
39279cc3 | 754 | if (!PageUptodate(page)) { |
9ebefb18 | 755 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
756 | lock_page(page); |
757 | if (!PageUptodate(page)) { | |
758 | ret = -EIO; | |
759 | goto out; | |
760 | } | |
761 | } | |
35ebb934 | 762 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 763 | |
b888db2b | 764 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 765 | |
39279cc3 CM |
766 | unlock_page(page); |
767 | page_cache_release(page); | |
011410bd | 768 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
769 | out: |
770 | return ret; | |
771 | } | |
772 | ||
773 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
774 | { | |
775 | struct inode *inode = dentry->d_inode; | |
776 | int err; | |
777 | ||
778 | err = inode_change_ok(inode, attr); | |
779 | if (err) | |
780 | return err; | |
781 | ||
782 | if (S_ISREG(inode->i_mode) && | |
783 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
784 | struct btrfs_trans_handle *trans; | |
785 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
786 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
787 | ||
5f39d397 | 788 | u64 mask = root->sectorsize - 1; |
39279cc3 | 789 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 790 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 791 | u64 hole_size; |
179e29e4 | 792 | u64 alloc_hint = 0; |
39279cc3 CM |
793 | |
794 | if (attr->ia_size <= pos) | |
795 | goto out; | |
796 | ||
797 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
798 | ||
2bf5a725 | 799 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 800 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
801 | |
802 | mutex_lock(&root->fs_info->fs_mutex); | |
803 | trans = btrfs_start_transaction(root, 1); | |
804 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 805 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
806 | pos, pos + hole_size, pos, |
807 | &alloc_hint); | |
2bf5a725 | 808 | |
179e29e4 CM |
809 | if (alloc_hint != EXTENT_MAP_INLINE) { |
810 | err = btrfs_insert_file_extent(trans, root, | |
811 | inode->i_ino, | |
812 | pos, 0, 0, hole_size); | |
813 | } | |
39279cc3 CM |
814 | btrfs_end_transaction(trans, root); |
815 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 816 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
817 | if (err) |
818 | return err; | |
39279cc3 CM |
819 | } |
820 | out: | |
821 | err = inode_setattr(inode, attr); | |
822 | ||
823 | return err; | |
824 | } | |
825 | void btrfs_delete_inode(struct inode *inode) | |
826 | { | |
827 | struct btrfs_trans_handle *trans; | |
828 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 829 | unsigned long nr; |
39279cc3 CM |
830 | int ret; |
831 | ||
832 | truncate_inode_pages(&inode->i_data, 0); | |
833 | if (is_bad_inode(inode)) { | |
834 | goto no_delete; | |
835 | } | |
5f39d397 | 836 | |
39279cc3 CM |
837 | inode->i_size = 0; |
838 | mutex_lock(&root->fs_info->fs_mutex); | |
839 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 840 | |
39279cc3 CM |
841 | btrfs_set_trans_block_group(trans, inode); |
842 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
843 | if (ret) |
844 | goto no_delete_lock; | |
845 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
846 | if (ret) |
847 | goto no_delete_lock; | |
848 | ret = btrfs_free_inode(trans, root, inode); | |
849 | if (ret) | |
850 | goto no_delete_lock; | |
d3c2fdcf | 851 | nr = trans->blocks_used; |
5f39d397 | 852 | |
39279cc3 CM |
853 | btrfs_end_transaction(trans, root); |
854 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 855 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 856 | return; |
54aa1f4d CM |
857 | |
858 | no_delete_lock: | |
d3c2fdcf | 859 | nr = trans->blocks_used; |
54aa1f4d CM |
860 | btrfs_end_transaction(trans, root); |
861 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 862 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
863 | no_delete: |
864 | clear_inode(inode); | |
865 | } | |
866 | ||
867 | /* | |
868 | * this returns the key found in the dir entry in the location pointer. | |
869 | * If no dir entries were found, location->objectid is 0. | |
870 | */ | |
871 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
872 | struct btrfs_key *location) | |
873 | { | |
874 | const char *name = dentry->d_name.name; | |
875 | int namelen = dentry->d_name.len; | |
876 | struct btrfs_dir_item *di; | |
877 | struct btrfs_path *path; | |
878 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 879 | int ret = 0; |
39279cc3 CM |
880 | |
881 | path = btrfs_alloc_path(); | |
882 | BUG_ON(!path); | |
39279cc3 CM |
883 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
884 | namelen, 0); | |
0d9f7f3e Y |
885 | if (IS_ERR(di)) |
886 | ret = PTR_ERR(di); | |
39279cc3 CM |
887 | if (!di || IS_ERR(di)) { |
888 | location->objectid = 0; | |
39279cc3 CM |
889 | goto out; |
890 | } | |
5f39d397 | 891 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 CM |
892 | out: |
893 | btrfs_release_path(root, path); | |
894 | btrfs_free_path(path); | |
895 | return ret; | |
896 | } | |
897 | ||
898 | /* | |
899 | * when we hit a tree root in a directory, the btrfs part of the inode | |
900 | * needs to be changed to reflect the root directory of the tree root. This | |
901 | * is kind of like crossing a mount point. | |
902 | */ | |
903 | static int fixup_tree_root_location(struct btrfs_root *root, | |
904 | struct btrfs_key *location, | |
58176a96 JB |
905 | struct btrfs_root **sub_root, |
906 | struct dentry *dentry) | |
39279cc3 CM |
907 | { |
908 | struct btrfs_path *path; | |
909 | struct btrfs_root_item *ri; | |
910 | ||
911 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
912 | return 0; | |
913 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
914 | return 0; | |
915 | ||
916 | path = btrfs_alloc_path(); | |
917 | BUG_ON(!path); | |
918 | mutex_lock(&root->fs_info->fs_mutex); | |
919 | ||
58176a96 JB |
920 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
921 | dentry->d_name.name, | |
922 | dentry->d_name.len); | |
39279cc3 CM |
923 | if (IS_ERR(*sub_root)) |
924 | return PTR_ERR(*sub_root); | |
925 | ||
926 | ri = &(*sub_root)->root_item; | |
927 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
928 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
929 | location->offset = 0; | |
930 | ||
931 | btrfs_free_path(path); | |
932 | mutex_unlock(&root->fs_info->fs_mutex); | |
933 | return 0; | |
934 | } | |
935 | ||
936 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
937 | { | |
938 | struct btrfs_iget_args *args = p; | |
939 | inode->i_ino = args->ino; | |
940 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
941 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
942 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
943 | return 0; |
944 | } | |
945 | ||
946 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
947 | { | |
948 | struct btrfs_iget_args *args = opaque; | |
949 | return (args->ino == inode->i_ino && | |
950 | args->root == BTRFS_I(inode)->root); | |
951 | } | |
952 | ||
953 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
954 | struct btrfs_root *root) | |
955 | { | |
956 | struct inode *inode; | |
957 | struct btrfs_iget_args args; | |
958 | args.ino = objectid; | |
959 | args.root = root; | |
960 | ||
961 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
962 | btrfs_init_locked_inode, | |
963 | (void *)&args); | |
964 | return inode; | |
965 | } | |
966 | ||
967 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
968 | struct nameidata *nd) | |
969 | { | |
970 | struct inode * inode; | |
971 | struct btrfs_inode *bi = BTRFS_I(dir); | |
972 | struct btrfs_root *root = bi->root; | |
973 | struct btrfs_root *sub_root = root; | |
974 | struct btrfs_key location; | |
975 | int ret; | |
976 | ||
977 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
978 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 979 | |
39279cc3 CM |
980 | mutex_lock(&root->fs_info->fs_mutex); |
981 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
982 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 983 | |
39279cc3 CM |
984 | if (ret < 0) |
985 | return ERR_PTR(ret); | |
5f39d397 | 986 | |
39279cc3 CM |
987 | inode = NULL; |
988 | if (location.objectid) { | |
58176a96 JB |
989 | ret = fixup_tree_root_location(root, &location, &sub_root, |
990 | dentry); | |
39279cc3 CM |
991 | if (ret < 0) |
992 | return ERR_PTR(ret); | |
993 | if (ret > 0) | |
994 | return ERR_PTR(-ENOENT); | |
995 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
996 | sub_root); | |
997 | if (!inode) | |
998 | return ERR_PTR(-EACCES); | |
999 | if (inode->i_state & I_NEW) { | |
1000 | /* the inode and parent dir are two different roots */ | |
1001 | if (sub_root != root) { | |
1002 | igrab(inode); | |
1003 | sub_root->inode = inode; | |
1004 | } | |
1005 | BTRFS_I(inode)->root = sub_root; | |
1006 | memcpy(&BTRFS_I(inode)->location, &location, | |
1007 | sizeof(location)); | |
1008 | btrfs_read_locked_inode(inode); | |
1009 | unlock_new_inode(inode); | |
1010 | } | |
1011 | } | |
1012 | return d_splice_alias(inode, dentry); | |
1013 | } | |
1014 | ||
39279cc3 CM |
1015 | static unsigned char btrfs_filetype_table[] = { |
1016 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1017 | }; | |
1018 | ||
1019 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1020 | { | |
1021 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1022 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1023 | struct btrfs_item *item; | |
1024 | struct btrfs_dir_item *di; | |
1025 | struct btrfs_key key; | |
5f39d397 | 1026 | struct btrfs_key found_key; |
39279cc3 CM |
1027 | struct btrfs_path *path; |
1028 | int ret; | |
1029 | u32 nritems; | |
5f39d397 | 1030 | struct extent_buffer *leaf; |
39279cc3 CM |
1031 | int slot; |
1032 | int advance; | |
1033 | unsigned char d_type; | |
1034 | int over = 0; | |
1035 | u32 di_cur; | |
1036 | u32 di_total; | |
1037 | u32 di_len; | |
1038 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1039 | char tmp_name[32]; |
1040 | char *name_ptr; | |
1041 | int name_len; | |
39279cc3 CM |
1042 | |
1043 | /* FIXME, use a real flag for deciding about the key type */ | |
1044 | if (root->fs_info->tree_root == root) | |
1045 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1046 | |
39279cc3 CM |
1047 | mutex_lock(&root->fs_info->fs_mutex); |
1048 | key.objectid = inode->i_ino; | |
39279cc3 CM |
1049 | btrfs_set_key_type(&key, key_type); |
1050 | key.offset = filp->f_pos; | |
5f39d397 | 1051 | |
39279cc3 | 1052 | path = btrfs_alloc_path(); |
2cc58cf2 | 1053 | path->reada = 2; |
39279cc3 CM |
1054 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1055 | if (ret < 0) | |
1056 | goto err; | |
1057 | advance = 0; | |
39279cc3 | 1058 | while(1) { |
5f39d397 CM |
1059 | leaf = path->nodes[0]; |
1060 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1061 | slot = path->slots[0]; |
1062 | if (advance || slot >= nritems) { | |
1063 | if (slot >= nritems -1) { | |
39279cc3 CM |
1064 | ret = btrfs_next_leaf(root, path); |
1065 | if (ret) | |
1066 | break; | |
5f39d397 CM |
1067 | leaf = path->nodes[0]; |
1068 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1069 | slot = path->slots[0]; |
1070 | } else { | |
1071 | slot++; | |
1072 | path->slots[0]++; | |
1073 | } | |
1074 | } | |
1075 | advance = 1; | |
5f39d397 CM |
1076 | item = btrfs_item_nr(leaf, slot); |
1077 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1078 | ||
1079 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1080 | break; |
5f39d397 | 1081 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1082 | break; |
5f39d397 | 1083 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1084 | continue; |
5f39d397 CM |
1085 | |
1086 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1087 | advance = 1; |
1088 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1089 | di_cur = 0; | |
5f39d397 | 1090 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1091 | while(di_cur < di_total) { |
5f39d397 CM |
1092 | struct btrfs_key location; |
1093 | ||
1094 | name_len = btrfs_dir_name_len(leaf, di); | |
1095 | if (name_len < 32) { | |
1096 | name_ptr = tmp_name; | |
1097 | } else { | |
1098 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1099 | BUG_ON(!name_ptr); | |
1100 | } | |
1101 | read_extent_buffer(leaf, name_ptr, | |
1102 | (unsigned long)(di + 1), name_len); | |
1103 | ||
1104 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1105 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1106 | ||
1107 | over = filldir(dirent, name_ptr, name_len, | |
1108 | found_key.offset, | |
1109 | location.objectid, | |
39279cc3 | 1110 | d_type); |
5f39d397 CM |
1111 | |
1112 | if (name_ptr != tmp_name) | |
1113 | kfree(name_ptr); | |
1114 | ||
39279cc3 CM |
1115 | if (over) |
1116 | goto nopos; | |
5103e947 JB |
1117 | di_len = btrfs_dir_name_len(leaf, di) + |
1118 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1119 | di_cur += di_len; |
1120 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1121 | } | |
1122 | } | |
1123 | filp->f_pos++; | |
1124 | nopos: | |
1125 | ret = 0; | |
1126 | err: | |
1127 | btrfs_release_path(root, path); | |
1128 | btrfs_free_path(path); | |
1129 | mutex_unlock(&root->fs_info->fs_mutex); | |
1130 | return ret; | |
1131 | } | |
1132 | ||
1133 | int btrfs_write_inode(struct inode *inode, int wait) | |
1134 | { | |
1135 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1136 | struct btrfs_trans_handle *trans; | |
1137 | int ret = 0; | |
1138 | ||
1139 | if (wait) { | |
1140 | mutex_lock(&root->fs_info->fs_mutex); | |
1141 | trans = btrfs_start_transaction(root, 1); | |
1142 | btrfs_set_trans_block_group(trans, inode); | |
1143 | ret = btrfs_commit_transaction(trans, root); | |
1144 | mutex_unlock(&root->fs_info->fs_mutex); | |
1145 | } | |
1146 | return ret; | |
1147 | } | |
1148 | ||
1149 | /* | |
54aa1f4d | 1150 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1151 | * inode changes. But, it is most likely to find the inode in cache. |
1152 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1153 | * to keep or drop this code. | |
1154 | */ | |
1155 | void btrfs_dirty_inode(struct inode *inode) | |
1156 | { | |
1157 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1158 | struct btrfs_trans_handle *trans; | |
1159 | ||
1160 | mutex_lock(&root->fs_info->fs_mutex); | |
1161 | trans = btrfs_start_transaction(root, 1); | |
1162 | btrfs_set_trans_block_group(trans, inode); | |
1163 | btrfs_update_inode(trans, root, inode); | |
1164 | btrfs_end_transaction(trans, root); | |
1165 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1166 | } |
1167 | ||
1168 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1169 | struct btrfs_root *root, | |
1170 | u64 objectid, | |
1171 | struct btrfs_block_group_cache *group, | |
1172 | int mode) | |
1173 | { | |
1174 | struct inode *inode; | |
5f39d397 | 1175 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1176 | struct btrfs_key *location; |
5f39d397 | 1177 | struct btrfs_path *path; |
39279cc3 CM |
1178 | int ret; |
1179 | int owner; | |
1180 | ||
5f39d397 CM |
1181 | path = btrfs_alloc_path(); |
1182 | BUG_ON(!path); | |
1183 | ||
39279cc3 CM |
1184 | inode = new_inode(root->fs_info->sb); |
1185 | if (!inode) | |
1186 | return ERR_PTR(-ENOMEM); | |
1187 | ||
b888db2b CM |
1188 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1189 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1190 | BTRFS_I(inode)->root = root; |
b888db2b | 1191 | |
39279cc3 CM |
1192 | if (mode & S_IFDIR) |
1193 | owner = 0; | |
1194 | else | |
1195 | owner = 1; | |
1196 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1197 | BTRFS_I(inode)->block_group = group; | |
1198 | ||
5f39d397 CM |
1199 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1200 | if (ret) | |
1201 | goto fail; | |
1202 | ||
39279cc3 CM |
1203 | inode->i_uid = current->fsuid; |
1204 | inode->i_gid = current->fsgid; | |
1205 | inode->i_mode = mode; | |
1206 | inode->i_ino = objectid; | |
1207 | inode->i_blocks = 0; | |
1208 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1209 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1210 | struct btrfs_inode_item); | |
1211 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1212 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1213 | btrfs_free_path(path); | |
1214 | ||
39279cc3 CM |
1215 | location = &BTRFS_I(inode)->location; |
1216 | location->objectid = objectid; | |
39279cc3 CM |
1217 | location->offset = 0; |
1218 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1219 | ||
39279cc3 CM |
1220 | insert_inode_hash(inode); |
1221 | return inode; | |
5f39d397 CM |
1222 | fail: |
1223 | btrfs_free_path(path); | |
1224 | return ERR_PTR(ret); | |
39279cc3 CM |
1225 | } |
1226 | ||
1227 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1228 | { | |
1229 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1230 | } | |
1231 | ||
1232 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1233 | struct dentry *dentry, struct inode *inode) | |
1234 | { | |
1235 | int ret; | |
1236 | struct btrfs_key key; | |
1237 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1238 | struct inode *parent_inode; |
5f39d397 | 1239 | |
39279cc3 | 1240 | key.objectid = inode->i_ino; |
39279cc3 CM |
1241 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1242 | key.offset = 0; | |
1243 | ||
1244 | ret = btrfs_insert_dir_item(trans, root, | |
1245 | dentry->d_name.name, dentry->d_name.len, | |
1246 | dentry->d_parent->d_inode->i_ino, | |
1247 | &key, btrfs_inode_type(inode)); | |
1248 | if (ret == 0) { | |
79c44584 CM |
1249 | parent_inode = dentry->d_parent->d_inode; |
1250 | parent_inode->i_size += dentry->d_name.len * 2; | |
1251 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1252 | ret = btrfs_update_inode(trans, root, |
1253 | dentry->d_parent->d_inode); | |
1254 | } | |
1255 | return ret; | |
1256 | } | |
1257 | ||
1258 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1259 | struct dentry *dentry, struct inode *inode) | |
1260 | { | |
1261 | int err = btrfs_add_link(trans, dentry, inode); | |
1262 | if (!err) { | |
1263 | d_instantiate(dentry, inode); | |
1264 | return 0; | |
1265 | } | |
1266 | if (err > 0) | |
1267 | err = -EEXIST; | |
1268 | return err; | |
1269 | } | |
1270 | ||
618e21d5 JB |
1271 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1272 | int mode, dev_t rdev) | |
1273 | { | |
1274 | struct btrfs_trans_handle *trans; | |
1275 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1276 | struct inode *inode; | |
1277 | int err; | |
1278 | int drop_inode = 0; | |
1279 | u64 objectid; | |
d3c2fdcf | 1280 | unsigned long nr; |
618e21d5 JB |
1281 | |
1282 | if (!new_valid_dev(rdev)) | |
1283 | return -EINVAL; | |
1284 | ||
1285 | mutex_lock(&root->fs_info->fs_mutex); | |
1286 | trans = btrfs_start_transaction(root, 1); | |
1287 | btrfs_set_trans_block_group(trans, dir); | |
1288 | ||
1289 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1290 | if (err) { | |
1291 | err = -ENOSPC; | |
1292 | goto out_unlock; | |
1293 | } | |
1294 | ||
1295 | inode = btrfs_new_inode(trans, root, objectid, | |
1296 | BTRFS_I(dir)->block_group, mode); | |
1297 | err = PTR_ERR(inode); | |
1298 | if (IS_ERR(inode)) | |
1299 | goto out_unlock; | |
1300 | ||
1301 | btrfs_set_trans_block_group(trans, inode); | |
1302 | err = btrfs_add_nondir(trans, dentry, inode); | |
1303 | if (err) | |
1304 | drop_inode = 1; | |
1305 | else { | |
1306 | inode->i_op = &btrfs_special_inode_operations; | |
1307 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1308 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1309 | } |
1310 | dir->i_sb->s_dirt = 1; | |
1311 | btrfs_update_inode_block_group(trans, inode); | |
1312 | btrfs_update_inode_block_group(trans, dir); | |
1313 | out_unlock: | |
d3c2fdcf | 1314 | nr = trans->blocks_used; |
618e21d5 JB |
1315 | btrfs_end_transaction(trans, root); |
1316 | mutex_unlock(&root->fs_info->fs_mutex); | |
1317 | ||
1318 | if (drop_inode) { | |
1319 | inode_dec_link_count(inode); | |
1320 | iput(inode); | |
1321 | } | |
d3c2fdcf | 1322 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1323 | return err; |
1324 | } | |
1325 | ||
39279cc3 CM |
1326 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1327 | int mode, struct nameidata *nd) | |
1328 | { | |
1329 | struct btrfs_trans_handle *trans; | |
1330 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1331 | struct inode *inode; | |
1332 | int err; | |
1333 | int drop_inode = 0; | |
d3c2fdcf | 1334 | unsigned long nr; |
39279cc3 CM |
1335 | u64 objectid; |
1336 | ||
1337 | mutex_lock(&root->fs_info->fs_mutex); | |
1338 | trans = btrfs_start_transaction(root, 1); | |
1339 | btrfs_set_trans_block_group(trans, dir); | |
1340 | ||
1341 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1342 | if (err) { | |
1343 | err = -ENOSPC; | |
1344 | goto out_unlock; | |
1345 | } | |
1346 | ||
1347 | inode = btrfs_new_inode(trans, root, objectid, | |
1348 | BTRFS_I(dir)->block_group, mode); | |
1349 | err = PTR_ERR(inode); | |
1350 | if (IS_ERR(inode)) | |
1351 | goto out_unlock; | |
1352 | ||
1353 | btrfs_set_trans_block_group(trans, inode); | |
1354 | err = btrfs_add_nondir(trans, dentry, inode); | |
1355 | if (err) | |
1356 | drop_inode = 1; | |
1357 | else { | |
1358 | inode->i_mapping->a_ops = &btrfs_aops; | |
1359 | inode->i_fop = &btrfs_file_operations; | |
1360 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1361 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1362 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1363 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1364 | } |
1365 | dir->i_sb->s_dirt = 1; | |
1366 | btrfs_update_inode_block_group(trans, inode); | |
1367 | btrfs_update_inode_block_group(trans, dir); | |
1368 | out_unlock: | |
d3c2fdcf | 1369 | nr = trans->blocks_used; |
39279cc3 CM |
1370 | btrfs_end_transaction(trans, root); |
1371 | mutex_unlock(&root->fs_info->fs_mutex); | |
1372 | ||
1373 | if (drop_inode) { | |
1374 | inode_dec_link_count(inode); | |
1375 | iput(inode); | |
1376 | } | |
d3c2fdcf | 1377 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1378 | return err; |
1379 | } | |
1380 | ||
1381 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1382 | struct dentry *dentry) | |
1383 | { | |
1384 | struct btrfs_trans_handle *trans; | |
1385 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1386 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1387 | unsigned long nr; |
39279cc3 CM |
1388 | int err; |
1389 | int drop_inode = 0; | |
1390 | ||
1391 | if (inode->i_nlink == 0) | |
1392 | return -ENOENT; | |
1393 | ||
1394 | inc_nlink(inode); | |
1395 | mutex_lock(&root->fs_info->fs_mutex); | |
1396 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1397 | |
39279cc3 CM |
1398 | btrfs_set_trans_block_group(trans, dir); |
1399 | atomic_inc(&inode->i_count); | |
1400 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1401 | |
39279cc3 CM |
1402 | if (err) |
1403 | drop_inode = 1; | |
5f39d397 | 1404 | |
39279cc3 CM |
1405 | dir->i_sb->s_dirt = 1; |
1406 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1407 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1408 | |
54aa1f4d CM |
1409 | if (err) |
1410 | drop_inode = 1; | |
39279cc3 | 1411 | |
d3c2fdcf | 1412 | nr = trans->blocks_used; |
39279cc3 CM |
1413 | btrfs_end_transaction(trans, root); |
1414 | mutex_unlock(&root->fs_info->fs_mutex); | |
1415 | ||
1416 | if (drop_inode) { | |
1417 | inode_dec_link_count(inode); | |
1418 | iput(inode); | |
1419 | } | |
d3c2fdcf | 1420 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1421 | return err; |
1422 | } | |
1423 | ||
1424 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
1425 | struct btrfs_root *root, | |
1426 | u64 objectid, u64 dirid) | |
1427 | { | |
1428 | int ret; | |
1429 | char buf[2]; | |
1430 | struct btrfs_key key; | |
1431 | ||
1432 | buf[0] = '.'; | |
1433 | buf[1] = '.'; | |
1434 | ||
1435 | key.objectid = objectid; | |
1436 | key.offset = 0; | |
39279cc3 CM |
1437 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1438 | ||
1439 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, | |
1440 | &key, BTRFS_FT_DIR); | |
1441 | if (ret) | |
1442 | goto error; | |
5f39d397 | 1443 | |
39279cc3 CM |
1444 | key.objectid = dirid; |
1445 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
1446 | &key, BTRFS_FT_DIR); | |
1447 | if (ret) | |
1448 | goto error; | |
1449 | error: | |
1450 | return ret; | |
1451 | } | |
1452 | ||
1453 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1454 | { | |
1455 | struct inode *inode; | |
1456 | struct btrfs_trans_handle *trans; | |
1457 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1458 | int err = 0; | |
1459 | int drop_on_err = 0; | |
1460 | u64 objectid; | |
d3c2fdcf | 1461 | unsigned long nr = 1; |
39279cc3 CM |
1462 | |
1463 | mutex_lock(&root->fs_info->fs_mutex); | |
1464 | trans = btrfs_start_transaction(root, 1); | |
1465 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1466 | |
39279cc3 CM |
1467 | if (IS_ERR(trans)) { |
1468 | err = PTR_ERR(trans); | |
1469 | goto out_unlock; | |
1470 | } | |
1471 | ||
1472 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1473 | if (err) { | |
1474 | err = -ENOSPC; | |
1475 | goto out_unlock; | |
1476 | } | |
1477 | ||
1478 | inode = btrfs_new_inode(trans, root, objectid, | |
1479 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1480 | if (IS_ERR(inode)) { | |
1481 | err = PTR_ERR(inode); | |
1482 | goto out_fail; | |
1483 | } | |
5f39d397 | 1484 | |
39279cc3 CM |
1485 | drop_on_err = 1; |
1486 | inode->i_op = &btrfs_dir_inode_operations; | |
1487 | inode->i_fop = &btrfs_dir_file_operations; | |
1488 | btrfs_set_trans_block_group(trans, inode); | |
1489 | ||
1490 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); | |
1491 | if (err) | |
1492 | goto out_fail; | |
1493 | ||
1494 | inode->i_size = 6; | |
1495 | err = btrfs_update_inode(trans, root, inode); | |
1496 | if (err) | |
1497 | goto out_fail; | |
5f39d397 | 1498 | |
39279cc3 CM |
1499 | err = btrfs_add_link(trans, dentry, inode); |
1500 | if (err) | |
1501 | goto out_fail; | |
5f39d397 | 1502 | |
39279cc3 CM |
1503 | d_instantiate(dentry, inode); |
1504 | drop_on_err = 0; | |
1505 | dir->i_sb->s_dirt = 1; | |
1506 | btrfs_update_inode_block_group(trans, inode); | |
1507 | btrfs_update_inode_block_group(trans, dir); | |
1508 | ||
1509 | out_fail: | |
d3c2fdcf | 1510 | nr = trans->blocks_used; |
39279cc3 | 1511 | btrfs_end_transaction(trans, root); |
5f39d397 | 1512 | |
39279cc3 CM |
1513 | out_unlock: |
1514 | mutex_unlock(&root->fs_info->fs_mutex); | |
1515 | if (drop_on_err) | |
1516 | iput(inode); | |
d3c2fdcf | 1517 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1518 | return err; |
1519 | } | |
1520 | ||
a52d9a80 CM |
1521 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1522 | size_t page_offset, u64 start, u64 end, | |
1523 | int create) | |
1524 | { | |
1525 | int ret; | |
1526 | int err = 0; | |
db94535d | 1527 | u64 bytenr; |
a52d9a80 CM |
1528 | u64 extent_start = 0; |
1529 | u64 extent_end = 0; | |
1530 | u64 objectid = inode->i_ino; | |
1531 | u32 found_type; | |
1532 | int failed_insert = 0; | |
1533 | struct btrfs_path *path; | |
1534 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1535 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1536 | struct extent_buffer *leaf; |
1537 | struct btrfs_key found_key; | |
a52d9a80 CM |
1538 | struct extent_map *em = NULL; |
1539 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1540 | struct btrfs_trans_handle *trans = NULL; | |
1541 | ||
1542 | path = btrfs_alloc_path(); | |
1543 | BUG_ON(!path); | |
1544 | mutex_lock(&root->fs_info->fs_mutex); | |
1545 | ||
1546 | again: | |
1547 | em = lookup_extent_mapping(em_tree, start, end); | |
1548 | if (em) { | |
1549 | goto out; | |
1550 | } | |
1551 | if (!em) { | |
1552 | em = alloc_extent_map(GFP_NOFS); | |
1553 | if (!em) { | |
1554 | err = -ENOMEM; | |
1555 | goto out; | |
1556 | } | |
5f39d397 CM |
1557 | em->start = EXTENT_MAP_HOLE; |
1558 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1559 | } |
1560 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1561 | ret = btrfs_lookup_file_extent(trans, root, path, |
1562 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1563 | if (ret < 0) { |
1564 | err = ret; | |
1565 | goto out; | |
1566 | } | |
1567 | ||
1568 | if (ret != 0) { | |
1569 | if (path->slots[0] == 0) | |
1570 | goto not_found; | |
1571 | path->slots[0]--; | |
1572 | } | |
1573 | ||
5f39d397 CM |
1574 | leaf = path->nodes[0]; |
1575 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1576 | struct btrfs_file_extent_item); |
a52d9a80 | 1577 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1578 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1579 | found_type = btrfs_key_type(&found_key); | |
1580 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1581 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1582 | goto not_found; | |
1583 | } | |
1584 | ||
5f39d397 CM |
1585 | found_type = btrfs_file_extent_type(leaf, item); |
1586 | extent_start = found_key.offset; | |
a52d9a80 CM |
1587 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1588 | extent_end = extent_start + | |
db94535d | 1589 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1590 | err = 0; |
b888db2b | 1591 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1592 | em->start = start; |
1593 | if (start < extent_start) { | |
b888db2b CM |
1594 | if (end < extent_start) |
1595 | goto not_found; | |
a52d9a80 CM |
1596 | em->end = extent_end - 1; |
1597 | } else { | |
1598 | em->end = end; | |
1599 | } | |
1600 | goto not_found_em; | |
1601 | } | |
db94535d CM |
1602 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1603 | if (bytenr == 0) { | |
a52d9a80 CM |
1604 | em->start = extent_start; |
1605 | em->end = extent_end - 1; | |
5f39d397 CM |
1606 | em->block_start = EXTENT_MAP_HOLE; |
1607 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1608 | goto insert; |
1609 | } | |
db94535d CM |
1610 | bytenr += btrfs_file_extent_offset(leaf, item); |
1611 | em->block_start = bytenr; | |
a52d9a80 | 1612 | em->block_end = em->block_start + |
db94535d | 1613 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1614 | em->start = extent_start; |
1615 | em->end = extent_end - 1; | |
1616 | goto insert; | |
1617 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1618 | unsigned long ptr; |
a52d9a80 | 1619 | char *map; |
3326d1b0 CM |
1620 | size_t size; |
1621 | size_t extent_offset; | |
1622 | size_t copy_size; | |
a52d9a80 | 1623 | |
5f39d397 CM |
1624 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1625 | path->slots[0])); | |
689f9346 | 1626 | extent_end = (extent_start + size - 1) | |
db94535d | 1627 | ((u64)root->sectorsize - 1); |
b888db2b | 1628 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1629 | em->start = start; |
1630 | if (start < extent_start) { | |
b888db2b CM |
1631 | if (end < extent_start) |
1632 | goto not_found; | |
50b78c24 | 1633 | em->end = extent_end; |
a52d9a80 CM |
1634 | } else { |
1635 | em->end = end; | |
1636 | } | |
1637 | goto not_found_em; | |
1638 | } | |
689f9346 Y |
1639 | em->block_start = EXTENT_MAP_INLINE; |
1640 | em->block_end = EXTENT_MAP_INLINE; | |
1641 | ||
1642 | if (!page) { | |
1643 | em->start = extent_start; | |
1644 | em->end = extent_start + size - 1; | |
1645 | goto out; | |
1646 | } | |
5f39d397 | 1647 | |
35ebb934 | 1648 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1649 | extent_start + page_offset; |
ae2f5411 | 1650 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1651 | size - extent_offset); |
3326d1b0 CM |
1652 | em->start = extent_start + extent_offset; |
1653 | em->end = (em->start + copy_size -1) | | |
1654 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1655 | map = kmap(page); |
1656 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1657 | if (create == 0 && !PageUptodate(page)) { |
1658 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1659 | copy_size); | |
1660 | flush_dcache_page(page); | |
1661 | } else if (create && PageUptodate(page)) { | |
1662 | if (!trans) { | |
1663 | kunmap(page); | |
1664 | free_extent_map(em); | |
1665 | em = NULL; | |
1666 | btrfs_release_path(root, path); | |
1667 | trans = btrfs_start_transaction(root, 1); | |
1668 | goto again; | |
1669 | } | |
1670 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1671 | copy_size); | |
1672 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1673 | } |
a52d9a80 | 1674 | kunmap(page); |
3326d1b0 | 1675 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1676 | goto insert; |
1677 | } else { | |
1678 | printk("unkknown found_type %d\n", found_type); | |
1679 | WARN_ON(1); | |
1680 | } | |
1681 | not_found: | |
1682 | em->start = start; | |
1683 | em->end = end; | |
1684 | not_found_em: | |
5f39d397 CM |
1685 | em->block_start = EXTENT_MAP_HOLE; |
1686 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1687 | insert: |
1688 | btrfs_release_path(root, path); | |
1689 | if (em->start > start || em->end < start) { | |
b888db2b | 1690 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1691 | err = -EIO; |
1692 | goto out; | |
1693 | } | |
1694 | ret = add_extent_mapping(em_tree, em); | |
1695 | if (ret == -EEXIST) { | |
1696 | free_extent_map(em); | |
2bf5a725 | 1697 | em = NULL; |
a52d9a80 CM |
1698 | failed_insert++; |
1699 | if (failed_insert > 5) { | |
1700 | printk("failing to insert %Lu %Lu\n", start, end); | |
1701 | err = -EIO; | |
1702 | goto out; | |
1703 | } | |
a52d9a80 CM |
1704 | goto again; |
1705 | } | |
1706 | err = 0; | |
1707 | out: | |
1708 | btrfs_free_path(path); | |
1709 | if (trans) { | |
1710 | ret = btrfs_end_transaction(trans, root); | |
1711 | if (!err) | |
1712 | err = ret; | |
1713 | } | |
1714 | mutex_unlock(&root->fs_info->fs_mutex); | |
1715 | if (err) { | |
1716 | free_extent_map(em); | |
1717 | WARN_ON(1); | |
1718 | return ERR_PTR(err); | |
1719 | } | |
1720 | return em; | |
1721 | } | |
1722 | ||
d396c6f5 | 1723 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1724 | { |
d396c6f5 | 1725 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1726 | } |
1727 | ||
1728 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1729 | unsigned from, unsigned to) | |
1730 | { | |
a52d9a80 CM |
1731 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1732 | page->mapping->host, page, from, to, | |
1733 | btrfs_get_extent); | |
39279cc3 CM |
1734 | } |
1735 | ||
a52d9a80 | 1736 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1737 | { |
a52d9a80 CM |
1738 | struct extent_map_tree *tree; |
1739 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1740 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1741 | } |
a52d9a80 | 1742 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1743 | { |
a52d9a80 | 1744 | struct extent_map_tree *tree; |
b888db2b CM |
1745 | |
1746 | ||
1747 | if (current->flags & PF_MEMALLOC) { | |
1748 | redirty_page_for_writepage(wbc, page); | |
1749 | unlock_page(page); | |
1750 | return 0; | |
1751 | } | |
a52d9a80 CM |
1752 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1753 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1754 | } |
1755 | ||
b293f02e CM |
1756 | static int btrfs_writepages(struct address_space *mapping, |
1757 | struct writeback_control *wbc) | |
1758 | { | |
1759 | struct extent_map_tree *tree; | |
1760 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1761 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
1762 | } | |
1763 | ||
3ab2fb5a CM |
1764 | static int |
1765 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
1766 | struct list_head *pages, unsigned nr_pages) | |
1767 | { | |
1768 | struct extent_map_tree *tree; | |
1769 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1770 | return extent_readpages(tree, mapping, pages, nr_pages, | |
1771 | btrfs_get_extent); | |
1772 | } | |
1773 | ||
a52d9a80 | 1774 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1775 | { |
a52d9a80 CM |
1776 | struct extent_map_tree *tree; |
1777 | int ret; | |
8c2383c3 | 1778 | |
a52d9a80 CM |
1779 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1780 | ret = try_release_extent_mapping(tree, page); | |
1781 | if (ret == 1) { | |
1782 | ClearPagePrivate(page); | |
1783 | set_page_private(page, 0); | |
1784 | page_cache_release(page); | |
39279cc3 | 1785 | } |
a52d9a80 | 1786 | return ret; |
39279cc3 CM |
1787 | } |
1788 | ||
a52d9a80 | 1789 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1790 | { |
a52d9a80 | 1791 | struct extent_map_tree *tree; |
39279cc3 | 1792 | |
a52d9a80 CM |
1793 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1794 | extent_invalidatepage(tree, page, offset); | |
1795 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1796 | } |
1797 | ||
9ebefb18 CM |
1798 | /* |
1799 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1800 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1801 | * be careful to check for EOF conditions here. We set the page up correctly | |
1802 | * for a written page which means we get ENOSPC checking when writing into | |
1803 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1804 | * support these features. | |
1805 | * | |
1806 | * We are not allowed to take the i_mutex here so we have to play games to | |
1807 | * protect against truncate races as the page could now be beyond EOF. Because | |
1808 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1809 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1810 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1811 | * unlock the page. | |
1812 | */ | |
1813 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1814 | { | |
1815 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1816 | unsigned long end; | |
1817 | loff_t size; | |
1818 | int ret = -EINVAL; | |
a52d9a80 | 1819 | u64 page_start; |
9ebefb18 | 1820 | |
011410bd | 1821 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1822 | lock_page(page); |
1823 | wait_on_page_writeback(page); | |
9ebefb18 | 1824 | size = i_size_read(inode); |
35ebb934 | 1825 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 1826 | |
9ebefb18 | 1827 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1828 | (page_start > size)) { |
9ebefb18 CM |
1829 | /* page got truncated out from underneath us */ |
1830 | goto out_unlock; | |
1831 | } | |
1832 | ||
1833 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1834 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1835 | end = size & ~PAGE_CACHE_MASK; |
1836 | else | |
1837 | end = PAGE_CACHE_SIZE; | |
1838 | ||
b888db2b | 1839 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1840 | |
1841 | out_unlock: | |
011410bd | 1842 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1843 | unlock_page(page); |
1844 | return ret; | |
1845 | } | |
1846 | ||
39279cc3 CM |
1847 | static void btrfs_truncate(struct inode *inode) |
1848 | { | |
1849 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1850 | int ret; | |
1851 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1852 | unsigned long nr; |
39279cc3 CM |
1853 | |
1854 | if (!S_ISREG(inode->i_mode)) | |
1855 | return; | |
1856 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1857 | return; | |
1858 | ||
1859 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1860 | ||
1861 | mutex_lock(&root->fs_info->fs_mutex); | |
1862 | trans = btrfs_start_transaction(root, 1); | |
1863 | btrfs_set_trans_block_group(trans, inode); | |
1864 | ||
1865 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1866 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 1867 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 1868 | nr = trans->blocks_used; |
5f39d397 | 1869 | |
39279cc3 CM |
1870 | ret = btrfs_end_transaction(trans, root); |
1871 | BUG_ON(ret); | |
1872 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1873 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1874 | } |
1875 | ||
1876 | int btrfs_commit_write(struct file *file, struct page *page, | |
1877 | unsigned from, unsigned to) | |
1878 | { | |
a52d9a80 CM |
1879 | return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1880 | page->mapping->host, page, from, to); | |
39279cc3 CM |
1881 | } |
1882 | ||
1883 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1884 | { | |
1885 | struct btrfs_trans_handle *trans; | |
1886 | struct btrfs_key key; | |
1887 | struct btrfs_root_item root_item; | |
1888 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 1889 | struct extent_buffer *leaf; |
39279cc3 CM |
1890 | struct btrfs_root *new_root; |
1891 | struct inode *inode; | |
1892 | struct inode *dir; | |
1893 | int ret; | |
54aa1f4d | 1894 | int err; |
39279cc3 CM |
1895 | u64 objectid; |
1896 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 1897 | unsigned long nr = 1; |
39279cc3 CM |
1898 | |
1899 | mutex_lock(&root->fs_info->fs_mutex); | |
1900 | trans = btrfs_start_transaction(root, 1); | |
1901 | BUG_ON(!trans); | |
1902 | ||
db94535d | 1903 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0); |
5f39d397 CM |
1904 | if (IS_ERR(leaf)) |
1905 | return PTR_ERR(leaf); | |
1906 | ||
1907 | btrfs_set_header_nritems(leaf, 0); | |
1908 | btrfs_set_header_level(leaf, 0); | |
db94535d | 1909 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 CM |
1910 | btrfs_set_header_generation(leaf, trans->transid); |
1911 | btrfs_set_header_owner(leaf, root->root_key.objectid); | |
1912 | write_extent_buffer(leaf, root->fs_info->fsid, | |
1913 | (unsigned long)btrfs_header_fsid(leaf), | |
1914 | BTRFS_FSID_SIZE); | |
1915 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
1916 | |
1917 | inode_item = &root_item.inode; | |
1918 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
1919 | inode_item->generation = cpu_to_le64(1); |
1920 | inode_item->size = cpu_to_le64(3); | |
1921 | inode_item->nlink = cpu_to_le32(1); | |
1922 | inode_item->nblocks = cpu_to_le64(1); | |
1923 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 1924 | |
db94535d CM |
1925 | btrfs_set_root_bytenr(&root_item, leaf->start); |
1926 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 1927 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
1928 | btrfs_set_root_used(&root_item, 0); |
1929 | ||
5eda7b5e CM |
1930 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1931 | root_item.drop_level = 0; | |
5f39d397 CM |
1932 | |
1933 | free_extent_buffer(leaf); | |
1934 | leaf = NULL; | |
39279cc3 CM |
1935 | |
1936 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1937 | 0, &objectid); | |
54aa1f4d CM |
1938 | if (ret) |
1939 | goto fail; | |
39279cc3 CM |
1940 | |
1941 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1942 | ||
1943 | key.objectid = objectid; | |
1944 | key.offset = 1; | |
39279cc3 CM |
1945 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
1946 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1947 | &root_item); | |
54aa1f4d CM |
1948 | if (ret) |
1949 | goto fail; | |
39279cc3 CM |
1950 | |
1951 | /* | |
1952 | * insert the directory item | |
1953 | */ | |
1954 | key.offset = (u64)-1; | |
1955 | dir = root->fs_info->sb->s_root->d_inode; | |
1956 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1957 | name, namelen, dir->i_ino, &key, | |
1958 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1959 | if (ret) |
1960 | goto fail; | |
39279cc3 CM |
1961 | |
1962 | ret = btrfs_commit_transaction(trans, root); | |
54aa1f4d CM |
1963 | if (ret) |
1964 | goto fail_commit; | |
39279cc3 | 1965 | |
58176a96 | 1966 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
1967 | BUG_ON(!new_root); |
1968 | ||
1969 | trans = btrfs_start_transaction(new_root, 1); | |
1970 | BUG_ON(!trans); | |
1971 | ||
1972 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
1973 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
1974 | if (IS_ERR(inode)) |
1975 | goto fail; | |
39279cc3 CM |
1976 | inode->i_op = &btrfs_dir_inode_operations; |
1977 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 1978 | new_root->inode = inode; |
39279cc3 CM |
1979 | |
1980 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
54aa1f4d CM |
1981 | if (ret) |
1982 | goto fail; | |
39279cc3 CM |
1983 | |
1984 | inode->i_nlink = 1; | |
1985 | inode->i_size = 6; | |
1986 | ret = btrfs_update_inode(trans, new_root, inode); | |
54aa1f4d CM |
1987 | if (ret) |
1988 | goto fail; | |
1989 | fail: | |
d3c2fdcf | 1990 | nr = trans->blocks_used; |
54aa1f4d CM |
1991 | err = btrfs_commit_transaction(trans, root); |
1992 | if (err && !ret) | |
1993 | ret = err; | |
1994 | fail_commit: | |
39279cc3 | 1995 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 1996 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 1997 | return ret; |
39279cc3 CM |
1998 | } |
1999 | ||
2000 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2001 | { | |
2002 | struct btrfs_trans_handle *trans; | |
2003 | struct btrfs_key key; | |
2004 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2005 | struct extent_buffer *tmp; |
39279cc3 | 2006 | int ret; |
54aa1f4d | 2007 | int err; |
39279cc3 | 2008 | u64 objectid; |
d3c2fdcf | 2009 | unsigned long nr; |
39279cc3 CM |
2010 | |
2011 | if (!root->ref_cows) | |
2012 | return -EINVAL; | |
2013 | ||
011410bd CM |
2014 | down_write(&root->snap_sem); |
2015 | freeze_bdev(root->fs_info->sb->s_bdev); | |
2016 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
2017 | ||
39279cc3 CM |
2018 | mutex_lock(&root->fs_info->fs_mutex); |
2019 | trans = btrfs_start_transaction(root, 1); | |
2020 | BUG_ON(!trans); | |
2021 | ||
2022 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2023 | if (ret) |
2024 | goto fail; | |
39279cc3 CM |
2025 | |
2026 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2027 | 0, &objectid); | |
54aa1f4d CM |
2028 | if (ret) |
2029 | goto fail; | |
39279cc3 CM |
2030 | |
2031 | memcpy(&new_root_item, &root->root_item, | |
2032 | sizeof(new_root_item)); | |
2033 | ||
2034 | key.objectid = objectid; | |
2035 | key.offset = 1; | |
39279cc3 | 2036 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
9691975d | 2037 | extent_buffer_get(root->node); |
83df7c1d | 2038 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2039 | free_extent_buffer(tmp); |
db94535d CM |
2040 | btrfs_set_root_bytenr(&new_root_item, root->node->start); |
2041 | btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node)); | |
39279cc3 CM |
2042 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2043 | &new_root_item); | |
54aa1f4d CM |
2044 | if (ret) |
2045 | goto fail; | |
39279cc3 CM |
2046 | |
2047 | /* | |
2048 | * insert the directory item | |
2049 | */ | |
2050 | key.offset = (u64)-1; | |
2051 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2052 | name, namelen, | |
2053 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2054 | &key, BTRFS_FT_DIR); | |
2055 | ||
54aa1f4d CM |
2056 | if (ret) |
2057 | goto fail; | |
39279cc3 CM |
2058 | |
2059 | ret = btrfs_inc_root_ref(trans, root); | |
54aa1f4d CM |
2060 | if (ret) |
2061 | goto fail; | |
54aa1f4d | 2062 | fail: |
d3c2fdcf | 2063 | nr = trans->blocks_used; |
54aa1f4d | 2064 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2065 | |
54aa1f4d CM |
2066 | if (err && !ret) |
2067 | ret = err; | |
5f39d397 | 2068 | |
39279cc3 | 2069 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2070 | up_write(&root->snap_sem); |
d3c2fdcf | 2071 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2072 | return ret; |
39279cc3 CM |
2073 | } |
2074 | ||
86479a04 CM |
2075 | static unsigned long force_ra(struct address_space *mapping, |
2076 | struct file_ra_state *ra, struct file *file, | |
2077 | pgoff_t offset, pgoff_t last_index) | |
2078 | { | |
2079 | pgoff_t req_size; | |
2080 | ||
2081 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2082 | req_size = last_index - offset + 1; | |
2083 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2084 | return offset; | |
2085 | #else | |
2086 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2087 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2088 | return offset + req_size; | |
2089 | #endif | |
2090 | } | |
2091 | ||
2092 | int btrfs_defrag_file(struct file *file) { | |
2093 | struct inode *inode = file->f_path.dentry->d_inode; | |
2094 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2095 | struct page *page; | |
2096 | unsigned long last_index; | |
2097 | unsigned long ra_index = 0; | |
2098 | u64 page_start; | |
2099 | u64 page_end; | |
2100 | unsigned long i; | |
2101 | ||
2102 | mutex_lock(&inode->i_mutex); | |
2103 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2104 | for (i = 0; i <= last_index; i++) { | |
2105 | if (i == ra_index) { | |
2106 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2107 | file, ra_index, last_index); | |
2108 | } | |
2109 | page = grab_cache_page(inode->i_mapping, i); | |
2110 | if (!page) | |
2111 | goto out_unlock; | |
2112 | if (!PageUptodate(page)) { | |
2113 | btrfs_readpage(NULL, page); | |
2114 | lock_page(page); | |
2115 | if (!PageUptodate(page)) { | |
2116 | unlock_page(page); | |
2117 | page_cache_release(page); | |
2118 | goto out_unlock; | |
2119 | } | |
2120 | } | |
35ebb934 | 2121 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2122 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2123 | ||
2124 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2125 | set_extent_delalloc(em_tree, page_start, | |
2126 | page_end, GFP_NOFS); | |
2127 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2128 | set_page_dirty(page); | |
2129 | unlock_page(page); | |
2130 | page_cache_release(page); | |
2131 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2132 | } | |
2133 | ||
2134 | out_unlock: | |
2135 | mutex_unlock(&inode->i_mutex); | |
2136 | return 0; | |
2137 | } | |
2138 | ||
d03581f4 | 2139 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2140 | { |
39279cc3 | 2141 | struct btrfs_ioctl_vol_args vol_args; |
39279cc3 | 2142 | struct btrfs_dir_item *di; |
39279cc3 | 2143 | struct btrfs_path *path; |
d03581f4 | 2144 | int namelen; |
39279cc3 CM |
2145 | u64 root_dirid; |
2146 | ||
d03581f4 CH |
2147 | if (copy_from_user(&vol_args, arg, sizeof(vol_args))) |
2148 | return -EFAULT; | |
5f39d397 | 2149 | |
d03581f4 CH |
2150 | namelen = strlen(vol_args.name); |
2151 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2152 | return -EINVAL; | |
2153 | if (strchr(vol_args.name, '/')) | |
2154 | return -EINVAL; | |
2155 | ||
2156 | path = btrfs_alloc_path(); | |
2157 | if (!path) | |
2158 | return -ENOMEM; | |
2159 | ||
2160 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2161 | mutex_lock(&root->fs_info->fs_mutex); | |
2162 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2163 | path, root_dirid, | |
2164 | vol_args.name, namelen, 0); | |
2165 | mutex_unlock(&root->fs_info->fs_mutex); | |
2166 | btrfs_free_path(path); | |
2167 | if (di && !IS_ERR(di)) | |
2168 | return -EEXIST; | |
2169 | if (IS_ERR(di)) | |
2170 | return PTR_ERR(di); | |
2171 | ||
2172 | if (root == root->fs_info->tree_root) | |
2173 | return create_subvol(root, vol_args.name, namelen); | |
2174 | return create_snapshot(root, vol_args.name, namelen); | |
2175 | } | |
2176 | ||
2177 | static int btrfs_ioctl_defrag(struct file *file) | |
2178 | { | |
2179 | struct inode *inode = file->f_path.dentry->d_inode; | |
2180 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2181 | ||
2182 | switch (inode->i_mode & S_IFMT) { | |
2183 | case S_IFDIR: | |
39279cc3 | 2184 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2185 | btrfs_defrag_root(root, 0); |
2186 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2187 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2188 | break; |
d03581f4 CH |
2189 | case S_IFREG: |
2190 | btrfs_defrag_file(file); | |
2191 | break; | |
2192 | } | |
2193 | ||
2194 | return 0; | |
2195 | } | |
6702ed49 | 2196 | |
d03581f4 CH |
2197 | long btrfs_ioctl(struct file *file, unsigned int |
2198 | cmd, unsigned long arg) | |
2199 | { | |
2200 | struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root; | |
2201 | ||
2202 | switch (cmd) { | |
2203 | case BTRFS_IOC_SNAP_CREATE: | |
2204 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2205 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2206 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2207 | } |
d03581f4 CH |
2208 | |
2209 | return -ENOTTY; | |
39279cc3 CM |
2210 | } |
2211 | ||
39279cc3 CM |
2212 | /* |
2213 | * Called inside transaction, so use GFP_NOFS | |
2214 | */ | |
2215 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2216 | { | |
2217 | struct btrfs_inode *ei; | |
2218 | ||
2219 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2220 | if (!ei) | |
2221 | return NULL; | |
15ee9bc7 | 2222 | ei->last_trans = 0; |
39279cc3 CM |
2223 | return &ei->vfs_inode; |
2224 | } | |
2225 | ||
2226 | void btrfs_destroy_inode(struct inode *inode) | |
2227 | { | |
2228 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2229 | WARN_ON(inode->i_data.nrpages); | |
2230 | ||
2231 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2232 | } | |
2233 | ||
44ec0b71 CM |
2234 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2235 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2236 | #else | |
39279cc3 CM |
2237 | static void init_once(void * foo, struct kmem_cache * cachep, |
2238 | unsigned long flags) | |
44ec0b71 | 2239 | #endif |
39279cc3 CM |
2240 | { |
2241 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2242 | ||
2243 | inode_init_once(&ei->vfs_inode); | |
2244 | } | |
2245 | ||
2246 | void btrfs_destroy_cachep(void) | |
2247 | { | |
2248 | if (btrfs_inode_cachep) | |
2249 | kmem_cache_destroy(btrfs_inode_cachep); | |
2250 | if (btrfs_trans_handle_cachep) | |
2251 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2252 | if (btrfs_transaction_cachep) | |
2253 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2254 | if (btrfs_bit_radix_cachep) | |
2255 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2256 | if (btrfs_path_cachep) | |
2257 | kmem_cache_destroy(btrfs_path_cachep); | |
2258 | } | |
2259 | ||
86479a04 | 2260 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2261 | unsigned long extra_flags, |
44ec0b71 CM |
2262 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2263 | void (*ctor)(struct kmem_cache *, void *) | |
2264 | #else | |
92fee66d | 2265 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2266 | unsigned long) |
2267 | #endif | |
2268 | ) | |
92fee66d CM |
2269 | { |
2270 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2271 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2272 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2273 | ,NULL | |
2274 | #endif | |
2275 | ); | |
2276 | } | |
2277 | ||
39279cc3 CM |
2278 | int btrfs_init_cachep(void) |
2279 | { | |
86479a04 | 2280 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2281 | sizeof(struct btrfs_inode), |
2282 | 0, init_once); | |
39279cc3 CM |
2283 | if (!btrfs_inode_cachep) |
2284 | goto fail; | |
86479a04 CM |
2285 | btrfs_trans_handle_cachep = |
2286 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2287 | sizeof(struct btrfs_trans_handle), | |
2288 | 0, NULL); | |
39279cc3 CM |
2289 | if (!btrfs_trans_handle_cachep) |
2290 | goto fail; | |
86479a04 | 2291 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2292 | sizeof(struct btrfs_transaction), |
92fee66d | 2293 | 0, NULL); |
39279cc3 CM |
2294 | if (!btrfs_transaction_cachep) |
2295 | goto fail; | |
86479a04 | 2296 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2297 | sizeof(struct btrfs_path), |
92fee66d | 2298 | 0, NULL); |
39279cc3 CM |
2299 | if (!btrfs_path_cachep) |
2300 | goto fail; | |
86479a04 | 2301 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2302 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2303 | if (!btrfs_bit_radix_cachep) |
2304 | goto fail; | |
2305 | return 0; | |
2306 | fail: | |
2307 | btrfs_destroy_cachep(); | |
2308 | return -ENOMEM; | |
2309 | } | |
2310 | ||
2311 | static int btrfs_getattr(struct vfsmount *mnt, | |
2312 | struct dentry *dentry, struct kstat *stat) | |
2313 | { | |
2314 | struct inode *inode = dentry->d_inode; | |
2315 | generic_fillattr(inode, stat); | |
2316 | stat->blksize = 256 * 1024; | |
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2321 | struct inode * new_dir,struct dentry *new_dentry) | |
2322 | { | |
2323 | struct btrfs_trans_handle *trans; | |
2324 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2325 | struct inode *new_inode = new_dentry->d_inode; | |
2326 | struct inode *old_inode = old_dentry->d_inode; | |
2327 | struct timespec ctime = CURRENT_TIME; | |
2328 | struct btrfs_path *path; | |
2329 | struct btrfs_dir_item *di; | |
2330 | int ret; | |
2331 | ||
2332 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2333 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2334 | return -ENOTEMPTY; | |
2335 | } | |
5f39d397 | 2336 | |
39279cc3 CM |
2337 | mutex_lock(&root->fs_info->fs_mutex); |
2338 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 2339 | |
39279cc3 CM |
2340 | btrfs_set_trans_block_group(trans, new_dir); |
2341 | path = btrfs_alloc_path(); | |
2342 | if (!path) { | |
2343 | ret = -ENOMEM; | |
2344 | goto out_fail; | |
2345 | } | |
2346 | ||
2347 | old_dentry->d_inode->i_nlink++; | |
2348 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2349 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2350 | old_inode->i_ctime = ctime; | |
5f39d397 | 2351 | |
39279cc3 CM |
2352 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { |
2353 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
5f39d397 | 2354 | struct btrfs_key old_parent_key; |
39279cc3 CM |
2355 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, |
2356 | "..", 2, -1); | |
2357 | if (IS_ERR(di)) { | |
2358 | ret = PTR_ERR(di); | |
2359 | goto out_fail; | |
2360 | } | |
2361 | if (!di) { | |
2362 | ret = -ENOENT; | |
2363 | goto out_fail; | |
2364 | } | |
5f39d397 | 2365 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &old_parent_key); |
39279cc3 CM |
2366 | ret = btrfs_del_item(trans, root, path); |
2367 | if (ret) { | |
39279cc3 CM |
2368 | goto out_fail; |
2369 | } | |
2370 | btrfs_release_path(root, path); | |
2371 | ||
2372 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2373 | old_inode->i_ino, | |
5f39d397 | 2374 | old_parent_key.objectid, |
39279cc3 CM |
2375 | "..", 2, -1); |
2376 | if (IS_ERR(di)) { | |
2377 | ret = PTR_ERR(di); | |
2378 | goto out_fail; | |
2379 | } | |
2380 | if (!di) { | |
2381 | ret = -ENOENT; | |
2382 | goto out_fail; | |
2383 | } | |
2384 | ret = btrfs_del_item(trans, root, path); | |
2385 | if (ret) { | |
39279cc3 CM |
2386 | goto out_fail; |
2387 | } | |
2388 | btrfs_release_path(root, path); | |
2389 | ||
2390 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2391 | old_inode->i_ino, location, | |
2392 | BTRFS_FT_DIR); | |
2393 | if (ret) | |
2394 | goto out_fail; | |
2395 | } | |
2396 | ||
2397 | ||
2398 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); | |
2399 | if (ret) | |
2400 | goto out_fail; | |
2401 | ||
2402 | if (new_inode) { | |
2403 | new_inode->i_ctime = CURRENT_TIME; | |
2404 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2405 | if (ret) | |
2406 | goto out_fail; | |
39279cc3 CM |
2407 | } |
2408 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2409 | if (ret) | |
2410 | goto out_fail; | |
2411 | ||
2412 | out_fail: | |
2413 | btrfs_free_path(path); | |
2414 | btrfs_end_transaction(trans, root); | |
2415 | mutex_unlock(&root->fs_info->fs_mutex); | |
2416 | return ret; | |
2417 | } | |
2418 | ||
2419 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2420 | const char *symname) | |
2421 | { | |
2422 | struct btrfs_trans_handle *trans; | |
2423 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2424 | struct btrfs_path *path; | |
2425 | struct btrfs_key key; | |
2426 | struct inode *inode; | |
2427 | int err; | |
2428 | int drop_inode = 0; | |
2429 | u64 objectid; | |
2430 | int name_len; | |
2431 | int datasize; | |
5f39d397 | 2432 | unsigned long ptr; |
39279cc3 | 2433 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2434 | struct extent_buffer *leaf; |
d3c2fdcf | 2435 | unsigned long nr; |
39279cc3 CM |
2436 | |
2437 | name_len = strlen(symname) + 1; | |
2438 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2439 | return -ENAMETOOLONG; | |
2440 | mutex_lock(&root->fs_info->fs_mutex); | |
2441 | trans = btrfs_start_transaction(root, 1); | |
2442 | btrfs_set_trans_block_group(trans, dir); | |
2443 | ||
2444 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2445 | if (err) { | |
2446 | err = -ENOSPC; | |
2447 | goto out_unlock; | |
2448 | } | |
2449 | ||
2450 | inode = btrfs_new_inode(trans, root, objectid, | |
2451 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2452 | err = PTR_ERR(inode); | |
2453 | if (IS_ERR(inode)) | |
2454 | goto out_unlock; | |
2455 | ||
2456 | btrfs_set_trans_block_group(trans, inode); | |
2457 | err = btrfs_add_nondir(trans, dentry, inode); | |
2458 | if (err) | |
2459 | drop_inode = 1; | |
2460 | else { | |
2461 | inode->i_mapping->a_ops = &btrfs_aops; | |
2462 | inode->i_fop = &btrfs_file_operations; | |
2463 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2464 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2465 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2466 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2467 | } |
2468 | dir->i_sb->s_dirt = 1; | |
2469 | btrfs_update_inode_block_group(trans, inode); | |
2470 | btrfs_update_inode_block_group(trans, dir); | |
2471 | if (drop_inode) | |
2472 | goto out_unlock; | |
2473 | ||
2474 | path = btrfs_alloc_path(); | |
2475 | BUG_ON(!path); | |
2476 | key.objectid = inode->i_ino; | |
2477 | key.offset = 0; | |
39279cc3 CM |
2478 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2479 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2480 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2481 | datasize); | |
54aa1f4d CM |
2482 | if (err) { |
2483 | drop_inode = 1; | |
2484 | goto out_unlock; | |
2485 | } | |
5f39d397 CM |
2486 | leaf = path->nodes[0]; |
2487 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2488 | struct btrfs_file_extent_item); | |
2489 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2490 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2491 | BTRFS_FILE_EXTENT_INLINE); |
2492 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2493 | write_extent_buffer(leaf, symname, ptr, name_len); |
2494 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2495 | btrfs_free_path(path); |
5f39d397 | 2496 | |
39279cc3 CM |
2497 | inode->i_op = &btrfs_symlink_inode_operations; |
2498 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2499 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2500 | err = btrfs_update_inode(trans, root, inode); |
2501 | if (err) | |
2502 | drop_inode = 1; | |
39279cc3 CM |
2503 | |
2504 | out_unlock: | |
d3c2fdcf | 2505 | nr = trans->blocks_used; |
39279cc3 CM |
2506 | btrfs_end_transaction(trans, root); |
2507 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2508 | if (drop_inode) { |
2509 | inode_dec_link_count(inode); | |
2510 | iput(inode); | |
2511 | } | |
d3c2fdcf | 2512 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2513 | return err; |
2514 | } | |
2515 | ||
2516 | static struct inode_operations btrfs_dir_inode_operations = { | |
2517 | .lookup = btrfs_lookup, | |
2518 | .create = btrfs_create, | |
2519 | .unlink = btrfs_unlink, | |
2520 | .link = btrfs_link, | |
2521 | .mkdir = btrfs_mkdir, | |
2522 | .rmdir = btrfs_rmdir, | |
2523 | .rename = btrfs_rename, | |
2524 | .symlink = btrfs_symlink, | |
2525 | .setattr = btrfs_setattr, | |
618e21d5 | 2526 | .mknod = btrfs_mknod, |
5103e947 JB |
2527 | .setxattr = generic_setxattr, |
2528 | .getxattr = generic_getxattr, | |
2529 | .listxattr = btrfs_listxattr, | |
2530 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2531 | }; |
2532 | ||
2533 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2534 | .lookup = btrfs_lookup, | |
2535 | }; | |
2536 | ||
2537 | static struct file_operations btrfs_dir_file_operations = { | |
2538 | .llseek = generic_file_llseek, | |
2539 | .read = generic_read_dir, | |
2540 | .readdir = btrfs_readdir, | |
34287aa3 | 2541 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2542 | #ifdef CONFIG_COMPAT |
34287aa3 | 2543 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2544 | #endif |
2545 | }; | |
2546 | ||
07157aac CM |
2547 | static struct extent_map_ops btrfs_extent_map_ops = { |
2548 | .fill_delalloc = run_delalloc_range, | |
2549 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2550 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2551 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2552 | }; | |
2553 | ||
39279cc3 CM |
2554 | static struct address_space_operations btrfs_aops = { |
2555 | .readpage = btrfs_readpage, | |
2556 | .writepage = btrfs_writepage, | |
b293f02e | 2557 | .writepages = btrfs_writepages, |
3ab2fb5a | 2558 | .readpages = btrfs_readpages, |
39279cc3 CM |
2559 | .sync_page = block_sync_page, |
2560 | .prepare_write = btrfs_prepare_write, | |
2561 | .commit_write = btrfs_commit_write, | |
2562 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2563 | .invalidatepage = btrfs_invalidatepage, |
2564 | .releasepage = btrfs_releasepage, | |
2565 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2566 | }; |
2567 | ||
2568 | static struct address_space_operations btrfs_symlink_aops = { | |
2569 | .readpage = btrfs_readpage, | |
2570 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2571 | .invalidatepage = btrfs_invalidatepage, |
2572 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2573 | }; |
2574 | ||
2575 | static struct inode_operations btrfs_file_inode_operations = { | |
2576 | .truncate = btrfs_truncate, | |
2577 | .getattr = btrfs_getattr, | |
2578 | .setattr = btrfs_setattr, | |
5103e947 JB |
2579 | .setxattr = generic_setxattr, |
2580 | .getxattr = generic_getxattr, | |
2581 | .listxattr = btrfs_listxattr, | |
2582 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2583 | }; |
2584 | ||
618e21d5 JB |
2585 | static struct inode_operations btrfs_special_inode_operations = { |
2586 | .getattr = btrfs_getattr, | |
2587 | .setattr = btrfs_setattr, | |
2588 | }; | |
2589 | ||
39279cc3 CM |
2590 | static struct inode_operations btrfs_symlink_inode_operations = { |
2591 | .readlink = generic_readlink, | |
2592 | .follow_link = page_follow_link_light, | |
2593 | .put_link = page_put_link, | |
2594 | }; |