Commit | Line | Data |
---|---|---|
2e635a27 | 1 | #include <linux/module.h> |
e20d96d6 | 2 | #include <linux/buffer_head.h> |
2e635a27 CM |
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> | |
dee26a9f | 11 | #include <linux/mpage.h> |
2e635a27 | 12 | #include "ctree.h" |
e20d96d6 | 13 | #include "disk-io.h" |
d5719762 | 14 | #include "transaction.h" |
2e635a27 CM |
15 | |
16 | #define BTRFS_SUPER_MAGIC 0x9123682E | |
e20d96d6 CM |
17 | |
18 | static struct inode_operations btrfs_dir_inode_operations; | |
19 | static struct super_operations btrfs_super_ops; | |
20 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
21 | static struct inode_operations btrfs_file_inode_operations; |
22 | static struct address_space_operations btrfs_aops; | |
23 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 24 | |
e20d96d6 | 25 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 26 | { |
e20d96d6 CM |
27 | struct btrfs_path path; |
28 | struct btrfs_inode_item *inode_item; | |
29 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
30 | int ret; | |
e20d96d6 CM |
31 | btrfs_init_path(&path); |
32 | ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0); | |
33 | if (ret) { | |
34 | make_bad_inode(inode); | |
78fae27e | 35 | btrfs_release_path(root, &path); |
e20d96d6 CM |
36 | return; |
37 | } | |
38 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
39 | path.slots[0], | |
40 | struct btrfs_inode_item); | |
2e635a27 | 41 | |
e20d96d6 CM |
42 | inode->i_mode = btrfs_inode_mode(inode_item); |
43 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
44 | inode->i_uid = btrfs_inode_uid(inode_item); | |
45 | inode->i_gid = btrfs_inode_gid(inode_item); | |
46 | inode->i_size = btrfs_inode_size(inode_item); | |
47 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
48 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
49 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
50 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
51 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
52 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
53 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
54 | inode->i_generation = btrfs_inode_generation(inode_item); | |
e20d96d6 CM |
55 | btrfs_release_path(root, &path); |
56 | switch (inode->i_mode & S_IFMT) { | |
57 | #if 0 | |
58 | default: | |
59 | init_special_inode(inode, inode->i_mode, | |
60 | btrfs_inode_rdev(inode_item)); | |
61 | break; | |
62 | #endif | |
63 | case S_IFREG: | |
dee26a9f CM |
64 | inode->i_mapping->a_ops = &btrfs_aops; |
65 | inode->i_fop = &btrfs_file_operations; | |
66 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
67 | break; |
68 | case S_IFDIR: | |
e20d96d6 CM |
69 | inode->i_op = &btrfs_dir_inode_operations; |
70 | inode->i_fop = &btrfs_dir_file_operations; | |
71 | break; | |
72 | case S_IFLNK: | |
e20d96d6 CM |
73 | // inode->i_op = &page_symlink_inode_operations; |
74 | break; | |
2e635a27 | 75 | } |
e20d96d6 | 76 | return; |
2e635a27 CM |
77 | } |
78 | ||
134e9731 CM |
79 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
80 | { | |
81 | struct btrfs_path path; | |
82 | struct btrfs_root *root; | |
83 | struct btrfs_trans_handle *trans; | |
84 | const char *name = dentry->d_name.name; | |
85 | int name_len = dentry->d_name.len; | |
86 | int ret; | |
87 | u64 objectid; | |
88 | struct btrfs_dir_item *di; | |
89 | ||
90 | btrfs_init_path(&path); | |
91 | root = btrfs_sb(dir->i_sb); | |
92 | mutex_lock(&root->fs_info->fs_mutex); | |
93 | trans = btrfs_start_transaction(root, 1); | |
94 | ||
95 | ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino, | |
96 | name, name_len, -1); | |
97 | if (ret < 0) | |
98 | goto err; | |
99 | if (ret > 0) { | |
100 | ret = -ENOENT; | |
101 | goto err; | |
102 | } | |
103 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
104 | struct btrfs_dir_item); | |
105 | objectid = btrfs_dir_objectid(di); | |
106 | ||
107 | ret = btrfs_del_item(trans, root, &path); | |
108 | BUG_ON(ret); | |
109 | dentry->d_inode->i_ctime = dir->i_ctime; | |
110 | err: | |
111 | btrfs_release_path(root, &path); | |
112 | btrfs_end_transaction(trans, root); | |
113 | mutex_unlock(&root->fs_info->fs_mutex); | |
114 | if (ret == 0) | |
115 | inode_dec_link_count(dentry->d_inode); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
120 | struct btrfs_root *root, | |
121 | struct inode *inode) | |
122 | { | |
123 | u64 objectid = inode->i_ino; | |
124 | struct btrfs_path path; | |
125 | struct btrfs_inode_map_item *map; | |
126 | struct btrfs_key stat_data_key; | |
127 | int ret; | |
128 | clear_inode(inode); | |
129 | btrfs_init_path(&path); | |
130 | ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1); | |
131 | if (ret) { | |
132 | if (ret > 0) | |
133 | ret = -ENOENT; | |
134 | btrfs_release_path(root, &path); | |
135 | goto error; | |
136 | } | |
137 | map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
138 | struct btrfs_inode_map_item); | |
139 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); | |
140 | ret = btrfs_del_item(trans, root->fs_info->inode_root, &path); | |
141 | BUG_ON(ret); | |
142 | btrfs_release_path(root, &path); | |
143 | btrfs_init_path(&path); | |
144 | ||
145 | ret = btrfs_lookup_inode(trans, root, &path, objectid, -1); | |
146 | BUG_ON(ret); | |
147 | ret = btrfs_del_item(trans, root, &path); | |
148 | BUG_ON(ret); | |
149 | btrfs_release_path(root, &path); | |
150 | error: | |
151 | return ret; | |
152 | } | |
153 | ||
154 | static void btrfs_delete_inode(struct inode *inode) | |
155 | { | |
156 | struct btrfs_trans_handle *trans; | |
157 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
158 | truncate_inode_pages(&inode->i_data, 0); | |
159 | if (is_bad_inode(inode)) { | |
160 | goto no_delete; | |
161 | } | |
162 | inode->i_size = 0; | |
163 | if (inode->i_blocks) | |
164 | WARN_ON(1); | |
165 | ||
166 | mutex_lock(&root->fs_info->fs_mutex); | |
167 | trans = btrfs_start_transaction(root, 1); | |
168 | btrfs_free_inode(trans, root, inode); | |
169 | btrfs_end_transaction(trans, root); | |
170 | mutex_unlock(&root->fs_info->fs_mutex); | |
171 | return; | |
172 | no_delete: | |
173 | clear_inode(inode); | |
174 | } | |
175 | ||
176 | ||
e20d96d6 CM |
177 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
178 | ino_t *ino) | |
179 | { | |
180 | const char *name = dentry->d_name.name; | |
181 | int namelen = dentry->d_name.len; | |
182 | struct btrfs_dir_item *di; | |
183 | struct btrfs_path path; | |
184 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
185 | int ret; | |
186 | ||
187 | btrfs_init_path(&path); | |
188 | ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, | |
189 | namelen, 0); | |
7f5c1516 | 190 | if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) { |
e20d96d6 CM |
191 | *ino = 0; |
192 | goto out; | |
193 | } | |
194 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
195 | struct btrfs_dir_item); | |
196 | *ino = btrfs_dir_objectid(di); | |
197 | out: | |
198 | btrfs_release_path(root, &path); | |
199 | return ret; | |
200 | } | |
201 | ||
202 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
203 | struct nameidata *nd) | |
204 | { | |
205 | struct inode * inode; | |
206 | ino_t ino; | |
207 | int ret; | |
208 | ||
209 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
210 | return ERR_PTR(-ENAMETOOLONG); | |
211 | ||
212 | ret = btrfs_inode_by_name(dir, dentry, &ino); | |
213 | if (ret < 0) | |
214 | return ERR_PTR(ret); | |
215 | inode = NULL; | |
216 | if (ino) { | |
e20d96d6 CM |
217 | inode = iget(dir->i_sb, ino); |
218 | if (!inode) | |
219 | return ERR_PTR(-EACCES); | |
220 | } | |
221 | return d_splice_alias(inode, dentry); | |
222 | } | |
223 | ||
224 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
225 | { | |
226 | struct inode *inode = filp->f_path.dentry->d_inode; | |
227 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
228 | struct btrfs_item *item; | |
229 | struct btrfs_dir_item *di; | |
230 | struct btrfs_key key; | |
231 | struct btrfs_path path; | |
232 | int ret; | |
233 | u32 nritems; | |
234 | struct btrfs_leaf *leaf; | |
235 | int slot; | |
236 | int advance; | |
237 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 238 | int over = 0; |
e20d96d6 CM |
239 | |
240 | key.objectid = inode->i_ino; | |
e20d96d6 CM |
241 | key.flags = 0; |
242 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
243 | key.offset = filp->f_pos; | |
244 | btrfs_init_path(&path); | |
245 | ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); | |
246 | if (ret < 0) { | |
247 | goto err; | |
248 | } | |
7f5c1516 | 249 | advance = 0; |
e20d96d6 CM |
250 | while(1) { |
251 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
252 | nritems = btrfs_header_nritems(&leaf->header); | |
253 | slot = path.slots[0]; | |
dee26a9f CM |
254 | if (advance || slot >= nritems) { |
255 | if (slot >= nritems -1) { | |
e20d96d6 CM |
256 | ret = btrfs_next_leaf(root, &path); |
257 | if (ret) | |
258 | break; | |
259 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
260 | nritems = btrfs_header_nritems(&leaf->header); | |
261 | slot = path.slots[0]; | |
e20d96d6 CM |
262 | } else { |
263 | slot++; | |
264 | path.slots[0]++; | |
265 | } | |
266 | } | |
267 | advance = 1; | |
268 | item = leaf->items + slot; | |
e20d96d6 CM |
269 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
270 | break; | |
271 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) | |
272 | continue; | |
7f5c1516 CM |
273 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
274 | continue; | |
dee26a9f CM |
275 | |
276 | advance = 1; | |
e20d96d6 | 277 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
278 | over = filldir(dirent, (const char *)(di + 1), |
279 | btrfs_dir_name_len(di), | |
280 | btrfs_disk_key_offset(&item->key), | |
281 | btrfs_dir_objectid(di), d_type); | |
7f5c1516 CM |
282 | if (over) { |
283 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
e20d96d6 | 284 | break; |
7f5c1516 | 285 | } |
e20d96d6 CM |
286 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
287 | } | |
e20d96d6 CM |
288 | ret = 0; |
289 | err: | |
290 | btrfs_release_path(root, &path); | |
291 | return ret; | |
292 | } | |
293 | ||
294 | static void btrfs_put_super (struct super_block * sb) | |
295 | { | |
296 | struct btrfs_root *root = btrfs_sb(sb); | |
297 | int ret; | |
298 | ||
299 | ret = close_ctree(root); | |
300 | if (ret) { | |
301 | printk("close ctree returns %d\n", ret); | |
302 | } | |
303 | sb->s_fs_info = NULL; | |
304 | } | |
2e635a27 CM |
305 | |
306 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
307 | { | |
308 | struct inode * inode; | |
e20d96d6 CM |
309 | struct dentry * root_dentry; |
310 | struct btrfs_super_block *disk_super; | |
311 | struct buffer_head *bh; | |
312 | struct btrfs_root *root; | |
2e635a27 CM |
313 | |
314 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
315 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
316 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
317 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
e20d96d6 | 318 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 319 | sb->s_time_gran = 1; |
e20d96d6 CM |
320 | |
321 | bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); | |
322 | if (!bh) { | |
323 | printk("btrfs: unable to read on disk super\n"); | |
324 | return -EIO; | |
325 | } | |
326 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
327 | root = open_ctree(sb, bh, disk_super); | |
328 | sb->s_fs_info = root; | |
329 | if (!root) { | |
330 | printk("btrfs: open_ctree failed\n"); | |
331 | return -EIO; | |
332 | } | |
333 | printk("read in super total blocks %Lu root %Lu\n", | |
334 | btrfs_super_total_blocks(disk_super), | |
335 | btrfs_super_root_dir(disk_super)); | |
336 | ||
337 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
2e635a27 CM |
338 | if (!inode) |
339 | return -ENOMEM; | |
e20d96d6 CM |
340 | if (inode->i_state & I_NEW) { |
341 | btrfs_read_locked_inode(inode); | |
342 | unlock_new_inode(inode); | |
343 | } | |
2e635a27 | 344 | |
e20d96d6 CM |
345 | root_dentry = d_alloc_root(inode); |
346 | if (!root_dentry) { | |
2e635a27 CM |
347 | iput(inode); |
348 | return -ENOMEM; | |
349 | } | |
e20d96d6 CM |
350 | sb->s_root = root_dentry; |
351 | ||
2e635a27 CM |
352 | return 0; |
353 | } | |
354 | ||
d5719762 CM |
355 | static void fill_inode_item(struct btrfs_inode_item *item, |
356 | struct inode *inode) | |
357 | { | |
358 | btrfs_set_inode_uid(item, inode->i_uid); | |
359 | btrfs_set_inode_gid(item, inode->i_gid); | |
360 | btrfs_set_inode_size(item, inode->i_size); | |
361 | btrfs_set_inode_mode(item, inode->i_mode); | |
362 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
363 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
364 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
365 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
366 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
367 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
368 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
369 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
370 | btrfs_set_inode_generation(item, inode->i_generation); | |
371 | } | |
372 | ||
4730a4bc CM |
373 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
374 | struct btrfs_root *root, | |
375 | struct inode *inode) | |
376 | { | |
377 | struct btrfs_inode_item *inode_item; | |
378 | struct btrfs_path path; | |
379 | int ret; | |
380 | ||
381 | btrfs_init_path(&path); | |
382 | ||
383 | ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1); | |
384 | if (ret) { | |
385 | if (ret > 0) | |
386 | ret = -ENOENT; | |
387 | goto failed; | |
388 | } | |
389 | ||
390 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
391 | path.slots[0], | |
392 | struct btrfs_inode_item); | |
393 | ||
394 | fill_inode_item(inode_item, inode); | |
395 | mark_buffer_dirty(path.nodes[0]); | |
396 | failed: | |
397 | btrfs_release_path(root, &path); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | static int btrfs_write_inode(struct inode *inode, int wait) | |
402 | { | |
403 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
404 | struct btrfs_trans_handle *trans; | |
405 | int ret; | |
406 | ||
407 | mutex_lock(&root->fs_info->fs_mutex); | |
408 | trans = btrfs_start_transaction(root, 1); | |
409 | ret = btrfs_update_inode(trans, root, inode); | |
410 | if (wait) | |
411 | btrfs_commit_transaction(trans, root); | |
412 | else | |
413 | btrfs_end_transaction(trans, root); | |
414 | mutex_unlock(&root->fs_info->fs_mutex); | |
415 | return ret; | |
416 | } | |
417 | ||
d5719762 CM |
418 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
419 | struct inode *dir, int mode) | |
420 | { | |
421 | struct inode *inode; | |
422 | struct btrfs_inode_item inode_item; | |
423 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
424 | struct btrfs_key key; | |
425 | int ret; | |
426 | u64 objectid; | |
427 | ||
428 | inode = new_inode(dir->i_sb); | |
429 | if (!inode) | |
430 | return ERR_PTR(-ENOMEM); | |
431 | ||
432 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
433 | BUG_ON(ret); | |
434 | ||
435 | inode->i_uid = current->fsuid; | |
436 | inode->i_gid = current->fsgid; | |
437 | inode->i_mode = mode; | |
438 | inode->i_ino = objectid; | |
439 | inode->i_blocks = 0; | |
440 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
441 | fill_inode_item(&inode_item, inode); | |
442 | ||
d5719762 CM |
443 | key.objectid = objectid; |
444 | key.flags = 0; | |
445 | key.offset = 0; | |
446 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
447 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
448 | BUG_ON(ret); | |
449 | ||
450 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
451 | BUG_ON(ret); | |
452 | ||
453 | insert_inode_hash(inode); | |
d5719762 CM |
454 | return inode; |
455 | } | |
456 | ||
457 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
458 | struct dentry *dentry, struct inode *inode) | |
459 | { | |
460 | int ret; | |
461 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
462 | dentry->d_name.name, dentry->d_name.len, | |
463 | dentry->d_parent->d_inode->i_ino, | |
464 | inode->i_ino, 0); | |
4730a4bc CM |
465 | if (ret == 0) { |
466 | dentry->d_parent->d_inode->i_size += dentry->d_name.len; | |
467 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), | |
468 | dentry->d_parent->d_inode); | |
469 | } | |
470 | ||
d5719762 CM |
471 | return ret; |
472 | } | |
473 | ||
474 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
475 | struct dentry *dentry, struct inode *inode) | |
476 | { | |
477 | int err = btrfs_add_link(trans, dentry, inode); | |
478 | if (!err) { | |
479 | d_instantiate(dentry, inode); | |
480 | return 0; | |
481 | } | |
d5719762 CM |
482 | return err; |
483 | } | |
484 | ||
485 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
486 | int mode, struct nameidata *nd) | |
487 | { | |
488 | struct btrfs_trans_handle *trans; | |
489 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
490 | struct inode *inode; | |
491 | int err; | |
134e9731 | 492 | int drop_inode = 0; |
d5719762 | 493 | |
d561c025 | 494 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
495 | trans = btrfs_start_transaction(root, 1); |
496 | inode = btrfs_new_inode(trans, dir, mode); | |
497 | err = PTR_ERR(inode); | |
498 | if (IS_ERR(inode)) | |
d561c025 | 499 | goto out_unlock; |
d5719762 CM |
500 | // FIXME mark the inode dirty |
501 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
502 | if (err) |
503 | drop_inode = 1; | |
dee26a9f CM |
504 | else { |
505 | inode->i_mapping->a_ops = &btrfs_aops; | |
506 | inode->i_fop = &btrfs_file_operations; | |
507 | inode->i_op = &btrfs_file_inode_operations; | |
508 | } | |
d5719762 CM |
509 | dir->i_sb->s_dirt = 1; |
510 | btrfs_end_transaction(trans, root); | |
d561c025 CM |
511 | out_unlock: |
512 | mutex_unlock(&root->fs_info->fs_mutex); | |
134e9731 CM |
513 | if (drop_inode) { |
514 | inode_dec_link_count(inode); | |
515 | iput(inode); | |
516 | } | |
d5719762 CM |
517 | return err; |
518 | } | |
519 | ||
f7922033 CM |
520 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
521 | struct inode *inode, struct inode *dir) | |
522 | { | |
523 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
524 | int ret; | |
525 | char buf[2]; | |
526 | buf[0] = '.'; | |
527 | buf[1] = '.'; | |
528 | ||
529 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, | |
530 | inode->i_ino, 1); | |
531 | if (ret) | |
532 | goto error; | |
533 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, | |
534 | dir->i_ino, 1); | |
4730a4bc CM |
535 | if (ret) |
536 | goto error; | |
537 | inode->i_size = 3; | |
538 | ret = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
539 | error: |
540 | return ret; | |
541 | } | |
542 | ||
543 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
544 | { | |
545 | struct inode *inode; | |
546 | struct btrfs_trans_handle *trans; | |
547 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
548 | int err = 0; | |
549 | int drop_on_err = 0; | |
550 | ||
551 | mutex_lock(&root->fs_info->fs_mutex); | |
552 | trans = btrfs_start_transaction(root, 1); | |
553 | if (IS_ERR(trans)) { | |
554 | err = PTR_ERR(trans); | |
555 | goto out_unlock; | |
556 | } | |
557 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); | |
558 | if (IS_ERR(inode)) { | |
559 | err = PTR_ERR(inode); | |
560 | goto out_fail; | |
561 | } | |
562 | drop_on_err = 1; | |
563 | inode->i_op = &btrfs_dir_inode_operations; | |
564 | inode->i_fop = &btrfs_dir_file_operations; | |
565 | ||
566 | err = btrfs_make_empty_dir(trans, inode, dir); | |
567 | if (err) | |
568 | goto out_fail; | |
569 | err = btrfs_add_link(trans, dentry, inode); | |
570 | if (err) | |
571 | goto out_fail; | |
572 | d_instantiate(dentry, inode); | |
f7922033 CM |
573 | drop_on_err = 0; |
574 | ||
575 | out_fail: | |
576 | btrfs_end_transaction(trans, root); | |
577 | out_unlock: | |
578 | mutex_unlock(&root->fs_info->fs_mutex); | |
579 | if (drop_on_err) | |
580 | iput(inode); | |
581 | return err; | |
582 | } | |
583 | ||
d5719762 CM |
584 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
585 | { | |
586 | struct btrfs_trans_handle *trans; | |
587 | struct btrfs_root *root; | |
588 | int ret; | |
df2ce34c | 589 | |
d5719762 | 590 | sb->s_dirt = 0; |
d561c025 CM |
591 | if (!wait) { |
592 | filemap_flush(sb->s_bdev->bd_inode->i_mapping); | |
593 | return 0; | |
594 | } | |
595 | filemap_write_and_wait(sb->s_bdev->bd_inode->i_mapping); | |
df2ce34c | 596 | |
d5719762 | 597 | root = btrfs_sb(sb); |
d561c025 | 598 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
599 | trans = btrfs_start_transaction(root, 1); |
600 | ret = btrfs_commit_transaction(trans, root); | |
601 | sb->s_dirt = 0; | |
602 | BUG_ON(ret); | |
603 | printk("btrfs sync_fs\n"); | |
d561c025 | 604 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
605 | return 0; |
606 | } | |
607 | ||
dee26a9f CM |
608 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
609 | struct buffer_head *result, int create) | |
610 | { | |
611 | int ret; | |
612 | int err = 0; | |
613 | u64 blocknr; | |
614 | u64 extent_start = 0; | |
615 | u64 extent_end = 0; | |
616 | u64 objectid = inode->i_ino; | |
617 | struct btrfs_path path; | |
618 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
619 | struct btrfs_trans_handle *trans = NULL; | |
620 | struct btrfs_file_extent_item *item; | |
621 | struct btrfs_leaf *leaf; | |
622 | struct btrfs_disk_key *found_key; | |
623 | ||
624 | btrfs_init_path(&path); | |
625 | mutex_lock(&root->fs_info->fs_mutex); | |
626 | if (create) | |
627 | trans = btrfs_start_transaction(root, 1); | |
628 | ||
629 | ||
630 | ret = btrfs_lookup_file_extent(trans, root, &path, | |
631 | inode->i_ino, iblock, 1, 0); | |
632 | if (ret < 0) { | |
633 | btrfs_release_path(root, &path); | |
634 | err = ret; | |
635 | goto out; | |
636 | } | |
637 | ||
638 | if (ret != 0) { | |
639 | if (path.slots[0] == 0) { | |
640 | btrfs_release_path(root, &path); | |
641 | goto allocate; | |
642 | } | |
643 | path.slots[0]--; | |
644 | } | |
645 | ||
646 | item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
647 | struct btrfs_file_extent_item); | |
648 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
649 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
650 | blocknr += btrfs_file_extent_offset(item); | |
651 | ||
652 | /* exact match found, use it */ | |
653 | if (ret == 0) { | |
654 | err = 0; | |
655 | map_bh(result, inode->i_sb, blocknr); | |
656 | btrfs_release_path(root, &path); | |
657 | goto out; | |
658 | } | |
659 | ||
660 | /* are we inside the extent that was found? */ | |
661 | found_key = &leaf->items[path.slots[0]].key; | |
662 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
663 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { | |
664 | extent_end = 0; | |
665 | extent_start = 0; | |
666 | btrfs_release_path(root, &path); | |
667 | goto allocate; | |
668 | } | |
669 | ||
670 | extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key); | |
671 | extent_start += btrfs_file_extent_offset(item); | |
672 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
673 | btrfs_release_path(root, &path); | |
674 | if (iblock >= extent_start && iblock < extent_end) { | |
675 | err = 0; | |
676 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); | |
677 | goto out; | |
678 | } | |
679 | allocate: | |
680 | /* ok, create a new extent */ | |
681 | if (!create) { | |
682 | err = 0; | |
683 | goto out; | |
684 | } | |
685 | ret = btrfs_alloc_file_extent(trans, root, objectid, iblock, | |
686 | 1, extent_end, &blocknr); | |
687 | if (ret) { | |
688 | err = ret; | |
689 | goto out; | |
690 | } | |
691 | map_bh(result, inode->i_sb, blocknr); | |
692 | ||
693 | out: | |
694 | if (trans) | |
695 | btrfs_end_transaction(trans, root); | |
696 | mutex_unlock(&root->fs_info->fs_mutex); | |
697 | return err; | |
698 | } | |
699 | ||
700 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
701 | unsigned from, unsigned to) | |
702 | { | |
703 | return block_prepare_write(page, from, to, btrfs_get_block); | |
704 | } | |
705 | ||
d561c025 CM |
706 | static void btrfs_write_super(struct super_block *sb) |
707 | { | |
708 | btrfs_sync_fs(sb, 1); | |
709 | } | |
710 | ||
dee26a9f CM |
711 | static int btrfs_readpage(struct file *file, struct page *page) |
712 | { | |
713 | return mpage_readpage(page, btrfs_get_block); | |
714 | } | |
715 | ||
716 | static int btrfs_readpages(struct file *file, struct address_space *mapping, | |
717 | struct list_head *pages, unsigned nr_pages) | |
718 | { | |
719 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); | |
720 | } | |
721 | ||
722 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | |
723 | { | |
724 | return block_write_full_page(page, btrfs_get_block, wbc); | |
725 | } | |
d561c025 | 726 | |
2e635a27 CM |
727 | static int btrfs_get_sb(struct file_system_type *fs_type, |
728 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
729 | { | |
730 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
731 | btrfs_fill_super, mnt); | |
732 | } | |
733 | ||
734 | static struct file_system_type btrfs_fs_type = { | |
735 | .owner = THIS_MODULE, | |
736 | .name = "btrfs", | |
737 | .get_sb = btrfs_get_sb, | |
738 | .kill_sb = kill_block_super, | |
739 | .fs_flags = FS_REQUIRES_DEV, | |
740 | }; | |
741 | ||
e20d96d6 CM |
742 | static struct super_operations btrfs_super_ops = { |
743 | .statfs = simple_statfs, | |
134e9731 | 744 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
745 | .put_super = btrfs_put_super, |
746 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
747 | .write_super = btrfs_write_super, |
748 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 749 | .write_inode = btrfs_write_inode, |
e20d96d6 CM |
750 | }; |
751 | ||
752 | static struct inode_operations btrfs_dir_inode_operations = { | |
753 | .lookup = btrfs_lookup, | |
d5719762 | 754 | .create = btrfs_create, |
134e9731 | 755 | .unlink = btrfs_unlink, |
f7922033 | 756 | .mkdir = btrfs_mkdir, |
e20d96d6 CM |
757 | }; |
758 | ||
759 | static struct file_operations btrfs_dir_file_operations = { | |
760 | .llseek = generic_file_llseek, | |
761 | .read = generic_read_dir, | |
762 | .readdir = btrfs_readdir, | |
763 | }; | |
764 | ||
dee26a9f CM |
765 | static struct address_space_operations btrfs_aops = { |
766 | .readpage = btrfs_readpage, | |
767 | .readpages = btrfs_readpages, | |
768 | .writepage = btrfs_writepage, | |
769 | .sync_page = block_sync_page, | |
770 | .prepare_write = btrfs_prepare_write, | |
771 | .commit_write = generic_commit_write, | |
772 | }; | |
773 | ||
774 | static struct inode_operations btrfs_file_inode_operations = { | |
775 | .truncate = NULL, | |
776 | }; | |
777 | ||
778 | static struct file_operations btrfs_file_operations = { | |
779 | .llseek = generic_file_llseek, | |
780 | .read = do_sync_read, | |
781 | .write = do_sync_write, | |
782 | .aio_read = generic_file_aio_read, | |
783 | .aio_write = generic_file_aio_write, | |
784 | .mmap = generic_file_mmap, | |
785 | .open = generic_file_open, | |
786 | .sendfile = generic_file_sendfile, | |
787 | .splice_read = generic_file_splice_read, | |
788 | .splice_write = generic_file_splice_write, | |
789 | }; | |
e20d96d6 | 790 | |
2e635a27 CM |
791 | static int __init init_btrfs_fs(void) |
792 | { | |
793 | printk("btrfs loaded!\n"); | |
794 | return register_filesystem(&btrfs_fs_type); | |
795 | } | |
796 | ||
797 | static void __exit exit_btrfs_fs(void) | |
798 | { | |
799 | unregister_filesystem(&btrfs_fs_type); | |
800 | printk("btrfs unloaded\n"); | |
801 | } | |
802 | ||
803 | module_init(init_btrfs_fs) | |
804 | module_exit(exit_btrfs_fs) | |
805 | ||
806 | MODULE_LICENSE("GPL"); |