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1 | #include <linux/module.h> | |
2 | #include <linux/buffer_head.h> | |
3 | #include <linux/fs.h> | |
4 | #include <linux/pagemap.h> | |
5 | #include <linux/highmem.h> | |
6 | #include <linux/time.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/smp_lock.h> | |
10 | #include <linux/backing-dev.h> | |
11 | #include "ctree.h" | |
12 | #include "disk-io.h" | |
13 | #include "transaction.h" | |
14 | ||
15 | #define BTRFS_SUPER_MAGIC 0x9123682E | |
16 | ||
17 | static struct inode_operations btrfs_dir_inode_operations; | |
18 | static struct super_operations btrfs_super_ops; | |
19 | static struct file_operations btrfs_dir_file_operations; | |
20 | ||
21 | static void btrfs_read_locked_inode(struct inode *inode) | |
22 | { | |
23 | struct btrfs_path path; | |
24 | struct btrfs_inode_item *inode_item; | |
25 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
26 | int ret; | |
27 | btrfs_init_path(&path); | |
28 | ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0); | |
29 | if (ret) { | |
30 | make_bad_inode(inode); | |
31 | btrfs_release_path(root, &path); | |
32 | return; | |
33 | } | |
34 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
35 | path.slots[0], | |
36 | struct btrfs_inode_item); | |
37 | ||
38 | inode->i_mode = btrfs_inode_mode(inode_item); | |
39 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
40 | inode->i_uid = btrfs_inode_uid(inode_item); | |
41 | inode->i_gid = btrfs_inode_gid(inode_item); | |
42 | inode->i_size = btrfs_inode_size(inode_item); | |
43 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
44 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
45 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
46 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
47 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
48 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
49 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
50 | inode->i_generation = btrfs_inode_generation(inode_item); | |
51 | btrfs_release_path(root, &path); | |
52 | switch (inode->i_mode & S_IFMT) { | |
53 | #if 0 | |
54 | default: | |
55 | init_special_inode(inode, inode->i_mode, | |
56 | btrfs_inode_rdev(inode_item)); | |
57 | break; | |
58 | #endif | |
59 | case S_IFREG: | |
60 | break; | |
61 | case S_IFDIR: | |
62 | inode->i_op = &btrfs_dir_inode_operations; | |
63 | inode->i_fop = &btrfs_dir_file_operations; | |
64 | break; | |
65 | case S_IFLNK: | |
66 | // inode->i_op = &page_symlink_inode_operations; | |
67 | break; | |
68 | } | |
69 | return; | |
70 | } | |
71 | ||
72 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
73 | { | |
74 | struct btrfs_path path; | |
75 | struct btrfs_root *root; | |
76 | struct btrfs_trans_handle *trans; | |
77 | const char *name = dentry->d_name.name; | |
78 | int name_len = dentry->d_name.len; | |
79 | int ret; | |
80 | u64 objectid; | |
81 | struct btrfs_dir_item *di; | |
82 | ||
83 | btrfs_init_path(&path); | |
84 | root = btrfs_sb(dir->i_sb); | |
85 | mutex_lock(&root->fs_info->fs_mutex); | |
86 | trans = btrfs_start_transaction(root, 1); | |
87 | ||
88 | ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino, | |
89 | name, name_len, -1); | |
90 | if (ret < 0) | |
91 | goto err; | |
92 | if (ret > 0) { | |
93 | ret = -ENOENT; | |
94 | goto err; | |
95 | } | |
96 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
97 | struct btrfs_dir_item); | |
98 | objectid = btrfs_dir_objectid(di); | |
99 | ||
100 | ret = btrfs_del_item(trans, root, &path); | |
101 | BUG_ON(ret); | |
102 | dentry->d_inode->i_ctime = dir->i_ctime; | |
103 | err: | |
104 | btrfs_release_path(root, &path); | |
105 | btrfs_end_transaction(trans, root); | |
106 | mutex_unlock(&root->fs_info->fs_mutex); | |
107 | if (ret == 0) | |
108 | inode_dec_link_count(dentry->d_inode); | |
109 | return ret; | |
110 | } | |
111 | ||
112 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
113 | struct btrfs_root *root, | |
114 | struct inode *inode) | |
115 | { | |
116 | u64 objectid = inode->i_ino; | |
117 | struct btrfs_path path; | |
118 | struct btrfs_inode_map_item *map; | |
119 | struct btrfs_key stat_data_key; | |
120 | int ret; | |
121 | clear_inode(inode); | |
122 | btrfs_init_path(&path); | |
123 | ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1); | |
124 | if (ret) { | |
125 | if (ret > 0) | |
126 | ret = -ENOENT; | |
127 | btrfs_release_path(root, &path); | |
128 | goto error; | |
129 | } | |
130 | map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
131 | struct btrfs_inode_map_item); | |
132 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); | |
133 | ret = btrfs_del_item(trans, root->fs_info->inode_root, &path); | |
134 | BUG_ON(ret); | |
135 | btrfs_release_path(root, &path); | |
136 | btrfs_init_path(&path); | |
137 | ||
138 | ret = btrfs_lookup_inode(trans, root, &path, objectid, -1); | |
139 | BUG_ON(ret); | |
140 | ret = btrfs_del_item(trans, root, &path); | |
141 | BUG_ON(ret); | |
142 | btrfs_release_path(root, &path); | |
143 | error: | |
144 | return ret; | |
145 | } | |
146 | ||
147 | static void btrfs_delete_inode(struct inode *inode) | |
148 | { | |
149 | struct btrfs_trans_handle *trans; | |
150 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
151 | truncate_inode_pages(&inode->i_data, 0); | |
152 | if (is_bad_inode(inode)) { | |
153 | goto no_delete; | |
154 | } | |
155 | inode->i_size = 0; | |
156 | if (inode->i_blocks) | |
157 | WARN_ON(1); | |
158 | ||
159 | mutex_lock(&root->fs_info->fs_mutex); | |
160 | trans = btrfs_start_transaction(root, 1); | |
161 | btrfs_free_inode(trans, root, inode); | |
162 | btrfs_end_transaction(trans, root); | |
163 | mutex_unlock(&root->fs_info->fs_mutex); | |
164 | return; | |
165 | no_delete: | |
166 | clear_inode(inode); | |
167 | } | |
168 | ||
169 | ||
170 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
171 | ino_t *ino) | |
172 | { | |
173 | const char *name = dentry->d_name.name; | |
174 | int namelen = dentry->d_name.len; | |
175 | struct btrfs_dir_item *di; | |
176 | struct btrfs_path path; | |
177 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
178 | int ret; | |
179 | ||
180 | btrfs_init_path(&path); | |
181 | ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, | |
182 | namelen, 0); | |
183 | if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) { | |
184 | *ino = 0; | |
185 | goto out; | |
186 | } | |
187 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
188 | struct btrfs_dir_item); | |
189 | *ino = btrfs_dir_objectid(di); | |
190 | out: | |
191 | btrfs_release_path(root, &path); | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
196 | struct nameidata *nd) | |
197 | { | |
198 | struct inode * inode; | |
199 | ino_t ino; | |
200 | int ret; | |
201 | ||
202 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
203 | return ERR_PTR(-ENAMETOOLONG); | |
204 | ||
205 | ret = btrfs_inode_by_name(dir, dentry, &ino); | |
206 | if (ret < 0) | |
207 | return ERR_PTR(ret); | |
208 | inode = NULL; | |
209 | if (ino) { | |
210 | inode = iget(dir->i_sb, ino); | |
211 | if (!inode) | |
212 | return ERR_PTR(-EACCES); | |
213 | } | |
214 | return d_splice_alias(inode, dentry); | |
215 | } | |
216 | ||
217 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path) | |
218 | { | |
219 | struct buffer_head *bh; | |
220 | struct btrfs_node *node; | |
221 | int i; | |
222 | int nritems; | |
223 | u64 objectid; | |
224 | u64 item_objectid; | |
225 | u64 blocknr; | |
226 | int slot; | |
227 | ||
228 | if (!path->nodes[1]) | |
229 | return; | |
230 | node = btrfs_buffer_node(path->nodes[1]); | |
231 | slot = path->slots[1]; | |
232 | objectid = btrfs_disk_key_objectid(&node->ptrs[slot].key); | |
233 | nritems = btrfs_header_nritems(&node->header); | |
234 | for (i = slot; i < nritems; i++) { | |
235 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
236 | if (item_objectid != objectid) | |
237 | break; | |
238 | blocknr = btrfs_node_blockptr(node, i); | |
239 | bh = sb_getblk(root->fs_info->sb, blocknr); | |
240 | ll_rw_block(READ, 1, &bh); | |
241 | brelse(bh); | |
242 | } | |
243 | ||
244 | } | |
245 | ||
246 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
247 | { | |
248 | struct inode *inode = filp->f_path.dentry->d_inode; | |
249 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
250 | struct btrfs_item *item; | |
251 | struct btrfs_dir_item *di; | |
252 | struct btrfs_key key; | |
253 | struct btrfs_path path; | |
254 | int ret; | |
255 | u32 nritems; | |
256 | struct btrfs_leaf *leaf; | |
257 | int slot; | |
258 | int advance; | |
259 | unsigned char d_type = DT_UNKNOWN; | |
260 | int over = 0; | |
261 | ||
262 | key.objectid = inode->i_ino; | |
263 | key.flags = 0; | |
264 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
265 | key.offset = filp->f_pos; | |
266 | btrfs_init_path(&path); | |
267 | ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); | |
268 | if (ret < 0) { | |
269 | goto err; | |
270 | } | |
271 | advance = 0; | |
272 | reada_leaves(root, &path); | |
273 | while(1) { | |
274 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
275 | nritems = btrfs_header_nritems(&leaf->header); | |
276 | slot = path.slots[0]; | |
277 | if (advance) { | |
278 | if (slot == nritems -1) { | |
279 | ret = btrfs_next_leaf(root, &path); | |
280 | if (ret) | |
281 | break; | |
282 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
283 | nritems = btrfs_header_nritems(&leaf->header); | |
284 | slot = path.slots[0]; | |
285 | if (path.nodes[1] && path.slots[1] == 0) | |
286 | reada_leaves(root, &path); | |
287 | } else { | |
288 | slot++; | |
289 | path.slots[0]++; | |
290 | } | |
291 | } | |
292 | advance = 1; | |
293 | item = leaf->items + slot; | |
294 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) | |
295 | break; | |
296 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) | |
297 | continue; | |
298 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) | |
299 | continue; | |
300 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
301 | over = filldir(dirent, (const char *)(di + 1), | |
302 | btrfs_dir_name_len(di), | |
303 | btrfs_disk_key_offset(&item->key), | |
304 | btrfs_dir_objectid(di), d_type); | |
305 | if (over) { | |
306 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
307 | break; | |
308 | } | |
309 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; | |
310 | } | |
311 | ret = 0; | |
312 | err: | |
313 | btrfs_release_path(root, &path); | |
314 | return ret; | |
315 | } | |
316 | ||
317 | static void btrfs_put_super (struct super_block * sb) | |
318 | { | |
319 | struct btrfs_root *root = btrfs_sb(sb); | |
320 | int ret; | |
321 | ||
322 | ret = close_ctree(root); | |
323 | if (ret) { | |
324 | printk("close ctree returns %d\n", ret); | |
325 | } | |
326 | sb->s_fs_info = NULL; | |
327 | } | |
328 | ||
329 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
330 | { | |
331 | struct inode * inode; | |
332 | struct dentry * root_dentry; | |
333 | struct btrfs_super_block *disk_super; | |
334 | struct buffer_head *bh; | |
335 | struct btrfs_root *root; | |
336 | ||
337 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
338 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
339 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
340 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
341 | sb->s_op = &btrfs_super_ops; | |
342 | sb->s_time_gran = 1; | |
343 | ||
344 | bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); | |
345 | if (!bh) { | |
346 | printk("btrfs: unable to read on disk super\n"); | |
347 | return -EIO; | |
348 | } | |
349 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
350 | root = open_ctree(sb, bh, disk_super); | |
351 | sb->s_fs_info = root; | |
352 | if (!root) { | |
353 | printk("btrfs: open_ctree failed\n"); | |
354 | return -EIO; | |
355 | } | |
356 | printk("read in super total blocks %Lu root %Lu\n", | |
357 | btrfs_super_total_blocks(disk_super), | |
358 | btrfs_super_root_dir(disk_super)); | |
359 | ||
360 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
361 | if (!inode) | |
362 | return -ENOMEM; | |
363 | if (inode->i_state & I_NEW) { | |
364 | btrfs_read_locked_inode(inode); | |
365 | unlock_new_inode(inode); | |
366 | } | |
367 | ||
368 | root_dentry = d_alloc_root(inode); | |
369 | if (!root_dentry) { | |
370 | iput(inode); | |
371 | return -ENOMEM; | |
372 | } | |
373 | sb->s_root = root_dentry; | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
378 | static void fill_inode_item(struct btrfs_inode_item *item, | |
379 | struct inode *inode) | |
380 | { | |
381 | btrfs_set_inode_uid(item, inode->i_uid); | |
382 | btrfs_set_inode_gid(item, inode->i_gid); | |
383 | btrfs_set_inode_size(item, inode->i_size); | |
384 | btrfs_set_inode_mode(item, inode->i_mode); | |
385 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
386 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
387 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
388 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
389 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
390 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
391 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
392 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
393 | btrfs_set_inode_generation(item, inode->i_generation); | |
394 | } | |
395 | ||
396 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
397 | struct btrfs_root *root, | |
398 | struct inode *inode) | |
399 | { | |
400 | struct btrfs_inode_item *inode_item; | |
401 | struct btrfs_path path; | |
402 | int ret; | |
403 | ||
404 | btrfs_init_path(&path); | |
405 | ||
406 | ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1); | |
407 | if (ret) { | |
408 | if (ret > 0) | |
409 | ret = -ENOENT; | |
410 | goto failed; | |
411 | } | |
412 | ||
413 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
414 | path.slots[0], | |
415 | struct btrfs_inode_item); | |
416 | ||
417 | fill_inode_item(inode_item, inode); | |
418 | mark_buffer_dirty(path.nodes[0]); | |
419 | failed: | |
420 | btrfs_release_path(root, &path); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | static int btrfs_write_inode(struct inode *inode, int wait) | |
425 | { | |
426 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
427 | struct btrfs_trans_handle *trans; | |
428 | int ret; | |
429 | ||
430 | mutex_lock(&root->fs_info->fs_mutex); | |
431 | trans = btrfs_start_transaction(root, 1); | |
432 | ret = btrfs_update_inode(trans, root, inode); | |
433 | if (wait) | |
434 | btrfs_commit_transaction(trans, root); | |
435 | else | |
436 | btrfs_end_transaction(trans, root); | |
437 | mutex_unlock(&root->fs_info->fs_mutex); | |
438 | return ret; | |
439 | } | |
440 | ||
441 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
442 | struct inode *dir, int mode) | |
443 | { | |
444 | struct inode *inode; | |
445 | struct btrfs_inode_item inode_item; | |
446 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
447 | struct btrfs_key key; | |
448 | int ret; | |
449 | u64 objectid; | |
450 | ||
451 | inode = new_inode(dir->i_sb); | |
452 | if (!inode) | |
453 | return ERR_PTR(-ENOMEM); | |
454 | ||
455 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
456 | BUG_ON(ret); | |
457 | ||
458 | inode->i_uid = current->fsuid; | |
459 | inode->i_gid = current->fsgid; | |
460 | inode->i_mode = mode; | |
461 | inode->i_ino = objectid; | |
462 | inode->i_blocks = 0; | |
463 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
464 | fill_inode_item(&inode_item, inode); | |
465 | ||
466 | key.objectid = objectid; | |
467 | key.flags = 0; | |
468 | key.offset = 0; | |
469 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
470 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
471 | BUG_ON(ret); | |
472 | ||
473 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
474 | BUG_ON(ret); | |
475 | ||
476 | insert_inode_hash(inode); | |
477 | return inode; | |
478 | } | |
479 | ||
480 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
481 | struct dentry *dentry, struct inode *inode) | |
482 | { | |
483 | int ret; | |
484 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
485 | dentry->d_name.name, dentry->d_name.len, | |
486 | dentry->d_parent->d_inode->i_ino, | |
487 | inode->i_ino, 0); | |
488 | if (ret == 0) { | |
489 | dentry->d_parent->d_inode->i_size += dentry->d_name.len; | |
490 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), | |
491 | dentry->d_parent->d_inode); | |
492 | } | |
493 | ||
494 | return ret; | |
495 | } | |
496 | ||
497 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
498 | struct dentry *dentry, struct inode *inode) | |
499 | { | |
500 | int err = btrfs_add_link(trans, dentry, inode); | |
501 | if (!err) { | |
502 | d_instantiate(dentry, inode); | |
503 | return 0; | |
504 | } | |
505 | return err; | |
506 | } | |
507 | ||
508 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
509 | int mode, struct nameidata *nd) | |
510 | { | |
511 | struct btrfs_trans_handle *trans; | |
512 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
513 | struct inode *inode; | |
514 | int err; | |
515 | int drop_inode = 0; | |
516 | ||
517 | mutex_lock(&root->fs_info->fs_mutex); | |
518 | trans = btrfs_start_transaction(root, 1); | |
519 | inode = btrfs_new_inode(trans, dir, mode); | |
520 | err = PTR_ERR(inode); | |
521 | if (IS_ERR(inode)) | |
522 | goto out_unlock; | |
523 | // FIXME mark the inode dirty | |
524 | err = btrfs_add_nondir(trans, dentry, inode); | |
525 | if (err) | |
526 | drop_inode = 1; | |
527 | dir->i_sb->s_dirt = 1; | |
528 | btrfs_end_transaction(trans, root); | |
529 | out_unlock: | |
530 | mutex_unlock(&root->fs_info->fs_mutex); | |
531 | if (drop_inode) { | |
532 | inode_dec_link_count(inode); | |
533 | iput(inode); | |
534 | } | |
535 | return err; | |
536 | } | |
537 | ||
538 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
539 | struct inode *inode, struct inode *dir) | |
540 | { | |
541 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
542 | int ret; | |
543 | char buf[2]; | |
544 | buf[0] = '.'; | |
545 | buf[1] = '.'; | |
546 | ||
547 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, | |
548 | inode->i_ino, 1); | |
549 | if (ret) | |
550 | goto error; | |
551 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, | |
552 | dir->i_ino, 1); | |
553 | if (ret) | |
554 | goto error; | |
555 | inode->i_size = 3; | |
556 | ret = btrfs_update_inode(trans, root, inode); | |
557 | error: | |
558 | return ret; | |
559 | } | |
560 | ||
561 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
562 | { | |
563 | struct inode *inode; | |
564 | struct btrfs_trans_handle *trans; | |
565 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
566 | int err = 0; | |
567 | int drop_on_err = 0; | |
568 | ||
569 | mutex_lock(&root->fs_info->fs_mutex); | |
570 | trans = btrfs_start_transaction(root, 1); | |
571 | if (IS_ERR(trans)) { | |
572 | err = PTR_ERR(trans); | |
573 | goto out_unlock; | |
574 | } | |
575 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); | |
576 | if (IS_ERR(inode)) { | |
577 | err = PTR_ERR(inode); | |
578 | goto out_fail; | |
579 | } | |
580 | drop_on_err = 1; | |
581 | inode->i_op = &btrfs_dir_inode_operations; | |
582 | inode->i_fop = &btrfs_dir_file_operations; | |
583 | ||
584 | err = btrfs_make_empty_dir(trans, inode, dir); | |
585 | if (err) | |
586 | goto out_fail; | |
587 | err = btrfs_add_link(trans, dentry, inode); | |
588 | if (err) | |
589 | goto out_fail; | |
590 | d_instantiate(dentry, inode); | |
591 | drop_on_err = 0; | |
592 | ||
593 | out_fail: | |
594 | btrfs_end_transaction(trans, root); | |
595 | out_unlock: | |
596 | mutex_unlock(&root->fs_info->fs_mutex); | |
597 | if (drop_on_err) | |
598 | iput(inode); | |
599 | return err; | |
600 | } | |
601 | ||
602 | static int btrfs_sync_fs(struct super_block *sb, int wait) | |
603 | { | |
604 | struct btrfs_trans_handle *trans; | |
605 | struct btrfs_root *root; | |
606 | int ret; | |
607 | ||
608 | sb->s_dirt = 0; | |
609 | if (!wait) { | |
610 | filemap_flush(sb->s_bdev->bd_inode->i_mapping); | |
611 | return 0; | |
612 | } | |
613 | filemap_write_and_wait(sb->s_bdev->bd_inode->i_mapping); | |
614 | ||
615 | root = btrfs_sb(sb); | |
616 | mutex_lock(&root->fs_info->fs_mutex); | |
617 | trans = btrfs_start_transaction(root, 1); | |
618 | ret = btrfs_commit_transaction(trans, root); | |
619 | sb->s_dirt = 0; | |
620 | BUG_ON(ret); | |
621 | printk("btrfs sync_fs\n"); | |
622 | mutex_unlock(&root->fs_info->fs_mutex); | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static void btrfs_write_super(struct super_block *sb) | |
627 | { | |
628 | btrfs_sync_fs(sb, 1); | |
629 | } | |
630 | ||
631 | ||
632 | static int btrfs_get_sb(struct file_system_type *fs_type, | |
633 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
634 | { | |
635 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
636 | btrfs_fill_super, mnt); | |
637 | } | |
638 | ||
639 | static struct file_system_type btrfs_fs_type = { | |
640 | .owner = THIS_MODULE, | |
641 | .name = "btrfs", | |
642 | .get_sb = btrfs_get_sb, | |
643 | .kill_sb = kill_block_super, | |
644 | .fs_flags = FS_REQUIRES_DEV, | |
645 | }; | |
646 | ||
647 | static struct super_operations btrfs_super_ops = { | |
648 | .statfs = simple_statfs, | |
649 | .delete_inode = btrfs_delete_inode, | |
650 | .put_super = btrfs_put_super, | |
651 | .read_inode = btrfs_read_locked_inode, | |
652 | .write_super = btrfs_write_super, | |
653 | .sync_fs = btrfs_sync_fs, | |
654 | .write_inode = btrfs_write_inode, | |
655 | }; | |
656 | ||
657 | static struct inode_operations btrfs_dir_inode_operations = { | |
658 | .lookup = btrfs_lookup, | |
659 | .create = btrfs_create, | |
660 | .unlink = btrfs_unlink, | |
661 | .mkdir = btrfs_mkdir, | |
662 | }; | |
663 | ||
664 | static struct file_operations btrfs_dir_file_operations = { | |
665 | .llseek = generic_file_llseek, | |
666 | .read = generic_read_dir, | |
667 | .readdir = btrfs_readdir, | |
668 | }; | |
669 | ||
670 | ||
671 | static int __init init_btrfs_fs(void) | |
672 | { | |
673 | printk("btrfs loaded!\n"); | |
674 | return register_filesystem(&btrfs_fs_type); | |
675 | } | |
676 | ||
677 | static void __exit exit_btrfs_fs(void) | |
678 | { | |
679 | unregister_filesystem(&btrfs_fs_type); | |
680 | printk("btrfs unloaded\n"); | |
681 | } | |
682 | ||
683 | module_init(init_btrfs_fs) | |
684 | module_exit(exit_btrfs_fs) | |
685 | ||
686 | MODULE_LICENSE("GPL"); |