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; | |
f4b9aa8d | 31 | |
e20d96d6 | 32 | btrfs_init_path(&path); |
f4b9aa8d CM |
33 | mutex_lock(&root->fs_info->fs_mutex); |
34 | ||
e20d96d6 CM |
35 | ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0); |
36 | if (ret) { | |
78fae27e | 37 | btrfs_release_path(root, &path); |
f4b9aa8d CM |
38 | mutex_unlock(&root->fs_info->fs_mutex); |
39 | make_bad_inode(inode); | |
e20d96d6 CM |
40 | return; |
41 | } | |
42 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
43 | path.slots[0], | |
44 | struct btrfs_inode_item); | |
2e635a27 | 45 | |
e20d96d6 CM |
46 | inode->i_mode = btrfs_inode_mode(inode_item); |
47 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
48 | inode->i_uid = btrfs_inode_uid(inode_item); | |
49 | inode->i_gid = btrfs_inode_gid(inode_item); | |
50 | inode->i_size = btrfs_inode_size(inode_item); | |
51 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
52 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
53 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
54 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
55 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
56 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
57 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
58 | inode->i_generation = btrfs_inode_generation(inode_item); | |
e20d96d6 | 59 | btrfs_release_path(root, &path); |
f4b9aa8d | 60 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
61 | switch (inode->i_mode & S_IFMT) { |
62 | #if 0 | |
63 | default: | |
64 | init_special_inode(inode, inode->i_mode, | |
65 | btrfs_inode_rdev(inode_item)); | |
66 | break; | |
67 | #endif | |
68 | case S_IFREG: | |
dee26a9f CM |
69 | inode->i_mapping->a_ops = &btrfs_aops; |
70 | inode->i_fop = &btrfs_file_operations; | |
71 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
72 | break; |
73 | case S_IFDIR: | |
e20d96d6 CM |
74 | inode->i_op = &btrfs_dir_inode_operations; |
75 | inode->i_fop = &btrfs_dir_file_operations; | |
76 | break; | |
77 | case S_IFLNK: | |
e20d96d6 CM |
78 | // inode->i_op = &page_symlink_inode_operations; |
79 | break; | |
2e635a27 | 80 | } |
e20d96d6 | 81 | return; |
2e635a27 CM |
82 | } |
83 | ||
5f443fd2 CM |
84 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
85 | struct btrfs_root *root, | |
86 | struct inode *dir, | |
87 | struct dentry *dentry) | |
134e9731 CM |
88 | { |
89 | struct btrfs_path path; | |
134e9731 CM |
90 | const char *name = dentry->d_name.name; |
91 | int name_len = dentry->d_name.len; | |
92 | int ret; | |
93 | u64 objectid; | |
94 | struct btrfs_dir_item *di; | |
95 | ||
96 | btrfs_init_path(&path); | |
134e9731 CM |
97 | ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino, |
98 | name, name_len, -1); | |
99 | if (ret < 0) | |
100 | goto err; | |
101 | if (ret > 0) { | |
102 | ret = -ENOENT; | |
103 | goto err; | |
104 | } | |
105 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
106 | struct btrfs_dir_item); | |
107 | objectid = btrfs_dir_objectid(di); | |
108 | ||
109 | ret = btrfs_del_item(trans, root, &path); | |
110 | BUG_ON(ret); | |
111 | dentry->d_inode->i_ctime = dir->i_ctime; | |
112 | err: | |
113 | btrfs_release_path(root, &path); | |
134e9731 CM |
114 | if (ret == 0) |
115 | inode_dec_link_count(dentry->d_inode); | |
116 | return ret; | |
117 | } | |
118 | ||
5f443fd2 CM |
119 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
120 | { | |
121 | struct btrfs_root *root; | |
122 | struct btrfs_trans_handle *trans; | |
123 | int ret; | |
124 | ||
125 | root = btrfs_sb(dir->i_sb); | |
126 | mutex_lock(&root->fs_info->fs_mutex); | |
127 | trans = btrfs_start_transaction(root, 1); | |
128 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
129 | btrfs_end_transaction(trans, root); | |
130 | mutex_unlock(&root->fs_info->fs_mutex); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
135 | { | |
136 | struct inode *inode = dentry->d_inode; | |
137 | int err; | |
138 | int ret; | |
139 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
140 | struct btrfs_path path; | |
141 | struct btrfs_key key; | |
142 | struct btrfs_trans_handle *trans; | |
143 | struct btrfs_disk_key *found_key; | |
144 | struct btrfs_leaf *leaf; | |
145 | ||
146 | btrfs_init_path(&path); | |
147 | mutex_lock(&root->fs_info->fs_mutex); | |
148 | trans = btrfs_start_transaction(root, 1); | |
149 | key.objectid = inode->i_ino; | |
150 | key.offset = (u64)-1; | |
151 | key.flags = 0; | |
152 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
153 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
154 | if (ret < 0) { | |
155 | err = ret; | |
156 | goto out; | |
157 | } | |
158 | ||
159 | BUG_ON(ret == 0); | |
160 | BUG_ON(path.slots[0] == 0); | |
161 | path.slots[0]--; | |
162 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
163 | found_key = &leaf->items[path.slots[0]].key; | |
164 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) { | |
165 | err = -ENOENT; | |
166 | goto out; | |
167 | } | |
168 | if (btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY || | |
169 | btrfs_disk_key_offset(found_key) != 2) { | |
170 | err = -ENOTEMPTY; | |
171 | goto out; | |
172 | } | |
173 | ret = btrfs_del_item(trans, root, &path); | |
174 | BUG_ON(ret); | |
175 | btrfs_release_path(root, &path); | |
176 | key.offset = 1; | |
177 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
178 | if (ret < 0) { | |
179 | err = ret; | |
180 | goto out; | |
181 | } | |
182 | if (ret > 0) { | |
183 | err = -ENOTEMPTY; | |
184 | goto out; | |
185 | } | |
186 | ret = btrfs_del_item(trans, root, &path); | |
187 | if (ret) { | |
188 | err = ret; | |
189 | goto out; | |
190 | } | |
191 | btrfs_release_path(root, &path); | |
192 | ||
193 | /* now the directory is empty */ | |
194 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
195 | if (!err) { | |
196 | inode->i_size = 0; | |
197 | } | |
198 | out: | |
199 | mutex_unlock(&root->fs_info->fs_mutex); | |
200 | ret = btrfs_end_transaction(trans, root); | |
201 | if (ret && !err) | |
202 | err = ret; | |
203 | return err; | |
204 | } | |
205 | ||
134e9731 CM |
206 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
207 | struct btrfs_root *root, | |
208 | struct inode *inode) | |
209 | { | |
210 | u64 objectid = inode->i_ino; | |
211 | struct btrfs_path path; | |
212 | struct btrfs_inode_map_item *map; | |
213 | struct btrfs_key stat_data_key; | |
214 | int ret; | |
215 | clear_inode(inode); | |
216 | btrfs_init_path(&path); | |
217 | ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1); | |
218 | if (ret) { | |
219 | if (ret > 0) | |
220 | ret = -ENOENT; | |
221 | btrfs_release_path(root, &path); | |
222 | goto error; | |
223 | } | |
224 | map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
225 | struct btrfs_inode_map_item); | |
226 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); | |
227 | ret = btrfs_del_item(trans, root->fs_info->inode_root, &path); | |
228 | BUG_ON(ret); | |
229 | btrfs_release_path(root, &path); | |
230 | btrfs_init_path(&path); | |
231 | ||
232 | ret = btrfs_lookup_inode(trans, root, &path, objectid, -1); | |
233 | BUG_ON(ret); | |
234 | ret = btrfs_del_item(trans, root, &path); | |
235 | BUG_ON(ret); | |
236 | btrfs_release_path(root, &path); | |
237 | error: | |
238 | return ret; | |
239 | } | |
240 | ||
f4b9aa8d CM |
241 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
242 | struct btrfs_root *root, | |
243 | struct inode *inode) | |
244 | { | |
245 | int ret; | |
246 | struct btrfs_path path; | |
247 | struct btrfs_key key; | |
248 | struct btrfs_disk_key *found_key; | |
249 | struct btrfs_leaf *leaf; | |
250 | struct btrfs_file_extent_item *fi; | |
251 | u64 extent_start; | |
252 | u64 extent_num_blocks; | |
253 | ||
254 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
255 | key.objectid = inode->i_ino; | |
256 | key.offset = (u64)-1; | |
257 | key.flags = 0; | |
258 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
259 | while(1) { | |
260 | btrfs_init_path(&path); | |
261 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
262 | if (ret < 0) { | |
263 | btrfs_release_path(root, &path); | |
264 | goto error; | |
265 | } | |
266 | if (ret > 0) { | |
267 | BUG_ON(path.slots[0] == 0); | |
268 | path.slots[0]--; | |
269 | } | |
270 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
271 | found_key = &leaf->items[path.slots[0]].key; | |
272 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) | |
273 | break; | |
274 | if (btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) | |
275 | break; | |
f4b9aa8d CM |
276 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
277 | break; | |
278 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
279 | path.slots[0], | |
280 | struct btrfs_file_extent_item); | |
281 | extent_start = btrfs_file_extent_disk_blocknr(fi); | |
282 | extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi); | |
283 | key.offset = btrfs_disk_key_offset(found_key) - 1; | |
284 | ret = btrfs_del_item(trans, root, &path); | |
285 | BUG_ON(ret); | |
286 | inode->i_blocks -= btrfs_file_extent_num_blocks(fi) >> 9; | |
287 | btrfs_release_path(root, &path); | |
288 | ret = btrfs_free_extent(trans, root, extent_start, | |
289 | extent_num_blocks, 0); | |
290 | BUG_ON(ret); | |
5f443fd2 | 291 | if (key.offset + 1 == 0) |
f4b9aa8d CM |
292 | break; |
293 | } | |
294 | btrfs_release_path(root, &path); | |
295 | ret = 0; | |
296 | error: | |
297 | return ret; | |
298 | } | |
299 | ||
134e9731 CM |
300 | static void btrfs_delete_inode(struct inode *inode) |
301 | { | |
302 | struct btrfs_trans_handle *trans; | |
303 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
f4b9aa8d CM |
304 | int ret; |
305 | ||
134e9731 CM |
306 | truncate_inode_pages(&inode->i_data, 0); |
307 | if (is_bad_inode(inode)) { | |
308 | goto no_delete; | |
309 | } | |
310 | inode->i_size = 0; | |
134e9731 CM |
311 | mutex_lock(&root->fs_info->fs_mutex); |
312 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
313 | if (S_ISREG(inode->i_mode)) { |
314 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
315 | BUG_ON(ret); | |
316 | } | |
134e9731 CM |
317 | btrfs_free_inode(trans, root, inode); |
318 | btrfs_end_transaction(trans, root); | |
319 | mutex_unlock(&root->fs_info->fs_mutex); | |
320 | return; | |
321 | no_delete: | |
322 | clear_inode(inode); | |
323 | } | |
324 | ||
e20d96d6 CM |
325 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
326 | ino_t *ino) | |
327 | { | |
328 | const char *name = dentry->d_name.name; | |
329 | int namelen = dentry->d_name.len; | |
330 | struct btrfs_dir_item *di; | |
331 | struct btrfs_path path; | |
332 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
333 | int ret; | |
334 | ||
335 | btrfs_init_path(&path); | |
336 | ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, | |
337 | namelen, 0); | |
7f5c1516 | 338 | if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) { |
e20d96d6 CM |
339 | *ino = 0; |
340 | goto out; | |
341 | } | |
342 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
343 | struct btrfs_dir_item); | |
344 | *ino = btrfs_dir_objectid(di); | |
345 | out: | |
346 | btrfs_release_path(root, &path); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
351 | struct nameidata *nd) | |
352 | { | |
353 | struct inode * inode; | |
354 | ino_t ino; | |
355 | int ret; | |
356 | ||
357 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
358 | return ERR_PTR(-ENAMETOOLONG); | |
359 | ||
360 | ret = btrfs_inode_by_name(dir, dentry, &ino); | |
361 | if (ret < 0) | |
362 | return ERR_PTR(ret); | |
363 | inode = NULL; | |
364 | if (ino) { | |
e20d96d6 CM |
365 | inode = iget(dir->i_sb, ino); |
366 | if (!inode) | |
367 | return ERR_PTR(-EACCES); | |
368 | } | |
369 | return d_splice_alias(inode, dentry); | |
370 | } | |
371 | ||
372 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
373 | { | |
374 | struct inode *inode = filp->f_path.dentry->d_inode; | |
375 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
376 | struct btrfs_item *item; | |
377 | struct btrfs_dir_item *di; | |
378 | struct btrfs_key key; | |
379 | struct btrfs_path path; | |
380 | int ret; | |
381 | u32 nritems; | |
382 | struct btrfs_leaf *leaf; | |
383 | int slot; | |
384 | int advance; | |
385 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 386 | int over = 0; |
e20d96d6 CM |
387 | |
388 | key.objectid = inode->i_ino; | |
e20d96d6 CM |
389 | key.flags = 0; |
390 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
391 | key.offset = filp->f_pos; | |
392 | btrfs_init_path(&path); | |
393 | ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); | |
394 | if (ret < 0) { | |
395 | goto err; | |
396 | } | |
7f5c1516 | 397 | advance = 0; |
e20d96d6 CM |
398 | while(1) { |
399 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
400 | nritems = btrfs_header_nritems(&leaf->header); | |
401 | slot = path.slots[0]; | |
dee26a9f CM |
402 | if (advance || slot >= nritems) { |
403 | if (slot >= nritems -1) { | |
e20d96d6 CM |
404 | ret = btrfs_next_leaf(root, &path); |
405 | if (ret) | |
406 | break; | |
407 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
408 | nritems = btrfs_header_nritems(&leaf->header); | |
409 | slot = path.slots[0]; | |
e20d96d6 CM |
410 | } else { |
411 | slot++; | |
412 | path.slots[0]++; | |
413 | } | |
414 | } | |
415 | advance = 1; | |
416 | item = leaf->items + slot; | |
e20d96d6 CM |
417 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
418 | break; | |
419 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) | |
420 | continue; | |
7f5c1516 CM |
421 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
422 | continue; | |
dee26a9f CM |
423 | |
424 | advance = 1; | |
e20d96d6 | 425 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
426 | over = filldir(dirent, (const char *)(di + 1), |
427 | btrfs_dir_name_len(di), | |
428 | btrfs_disk_key_offset(&item->key), | |
429 | btrfs_dir_objectid(di), d_type); | |
7f5c1516 CM |
430 | if (over) { |
431 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
e20d96d6 | 432 | break; |
7f5c1516 | 433 | } |
e20d96d6 CM |
434 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
435 | } | |
e20d96d6 CM |
436 | ret = 0; |
437 | err: | |
438 | btrfs_release_path(root, &path); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | static void btrfs_put_super (struct super_block * sb) | |
443 | { | |
444 | struct btrfs_root *root = btrfs_sb(sb); | |
445 | int ret; | |
446 | ||
447 | ret = close_ctree(root); | |
448 | if (ret) { | |
449 | printk("close ctree returns %d\n", ret); | |
450 | } | |
451 | sb->s_fs_info = NULL; | |
452 | } | |
2e635a27 CM |
453 | |
454 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
455 | { | |
456 | struct inode * inode; | |
e20d96d6 CM |
457 | struct dentry * root_dentry; |
458 | struct btrfs_super_block *disk_super; | |
459 | struct buffer_head *bh; | |
460 | struct btrfs_root *root; | |
2e635a27 CM |
461 | |
462 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
463 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
464 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
465 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
e20d96d6 | 466 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 467 | sb->s_time_gran = 1; |
e20d96d6 CM |
468 | |
469 | bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); | |
470 | if (!bh) { | |
471 | printk("btrfs: unable to read on disk super\n"); | |
472 | return -EIO; | |
473 | } | |
474 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
475 | root = open_ctree(sb, bh, disk_super); | |
d98237b3 | 476 | |
e20d96d6 CM |
477 | if (!root) { |
478 | printk("btrfs: open_ctree failed\n"); | |
479 | return -EIO; | |
480 | } | |
87cbda5c CM |
481 | sb->s_fs_info = root; |
482 | disk_super = root->fs_info->disk_super; | |
e20d96d6 CM |
483 | printk("read in super total blocks %Lu root %Lu\n", |
484 | btrfs_super_total_blocks(disk_super), | |
485 | btrfs_super_root_dir(disk_super)); | |
486 | ||
487 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
2e635a27 CM |
488 | if (!inode) |
489 | return -ENOMEM; | |
e20d96d6 CM |
490 | if (inode->i_state & I_NEW) { |
491 | btrfs_read_locked_inode(inode); | |
492 | unlock_new_inode(inode); | |
493 | } | |
2e635a27 | 494 | |
e20d96d6 CM |
495 | root_dentry = d_alloc_root(inode); |
496 | if (!root_dentry) { | |
2e635a27 CM |
497 | iput(inode); |
498 | return -ENOMEM; | |
499 | } | |
e20d96d6 CM |
500 | sb->s_root = root_dentry; |
501 | ||
2e635a27 CM |
502 | return 0; |
503 | } | |
504 | ||
d5719762 CM |
505 | static void fill_inode_item(struct btrfs_inode_item *item, |
506 | struct inode *inode) | |
507 | { | |
508 | btrfs_set_inode_uid(item, inode->i_uid); | |
509 | btrfs_set_inode_gid(item, inode->i_gid); | |
510 | btrfs_set_inode_size(item, inode->i_size); | |
511 | btrfs_set_inode_mode(item, inode->i_mode); | |
512 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
513 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
514 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
515 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
516 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
517 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
518 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
519 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
520 | btrfs_set_inode_generation(item, inode->i_generation); | |
521 | } | |
522 | ||
4730a4bc CM |
523 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
524 | struct btrfs_root *root, | |
525 | struct inode *inode) | |
526 | { | |
527 | struct btrfs_inode_item *inode_item; | |
528 | struct btrfs_path path; | |
529 | int ret; | |
530 | ||
531 | btrfs_init_path(&path); | |
532 | ||
533 | ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1); | |
534 | if (ret) { | |
535 | if (ret > 0) | |
536 | ret = -ENOENT; | |
537 | goto failed; | |
538 | } | |
539 | ||
540 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
541 | path.slots[0], | |
542 | struct btrfs_inode_item); | |
543 | ||
544 | fill_inode_item(inode_item, inode); | |
545 | mark_buffer_dirty(path.nodes[0]); | |
546 | failed: | |
547 | btrfs_release_path(root, &path); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | static int btrfs_write_inode(struct inode *inode, int wait) | |
552 | { | |
553 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
554 | struct btrfs_trans_handle *trans; | |
555 | int ret; | |
556 | ||
557 | mutex_lock(&root->fs_info->fs_mutex); | |
558 | trans = btrfs_start_transaction(root, 1); | |
559 | ret = btrfs_update_inode(trans, root, inode); | |
560 | if (wait) | |
561 | btrfs_commit_transaction(trans, root); | |
562 | else | |
563 | btrfs_end_transaction(trans, root); | |
564 | mutex_unlock(&root->fs_info->fs_mutex); | |
565 | return ret; | |
566 | } | |
567 | ||
d5719762 CM |
568 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
569 | struct inode *dir, int mode) | |
570 | { | |
571 | struct inode *inode; | |
572 | struct btrfs_inode_item inode_item; | |
573 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
574 | struct btrfs_key key; | |
575 | int ret; | |
576 | u64 objectid; | |
577 | ||
578 | inode = new_inode(dir->i_sb); | |
579 | if (!inode) | |
580 | return ERR_PTR(-ENOMEM); | |
581 | ||
582 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
583 | BUG_ON(ret); | |
584 | ||
585 | inode->i_uid = current->fsuid; | |
586 | inode->i_gid = current->fsgid; | |
587 | inode->i_mode = mode; | |
588 | inode->i_ino = objectid; | |
589 | inode->i_blocks = 0; | |
590 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
591 | fill_inode_item(&inode_item, inode); | |
592 | ||
d5719762 CM |
593 | key.objectid = objectid; |
594 | key.flags = 0; | |
595 | key.offset = 0; | |
596 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
597 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
598 | BUG_ON(ret); | |
599 | ||
600 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
601 | BUG_ON(ret); | |
602 | ||
603 | insert_inode_hash(inode); | |
d5719762 CM |
604 | return inode; |
605 | } | |
606 | ||
607 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
608 | struct dentry *dentry, struct inode *inode) | |
609 | { | |
610 | int ret; | |
611 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
612 | dentry->d_name.name, dentry->d_name.len, | |
613 | dentry->d_parent->d_inode->i_ino, | |
614 | inode->i_ino, 0); | |
4730a4bc CM |
615 | if (ret == 0) { |
616 | dentry->d_parent->d_inode->i_size += dentry->d_name.len; | |
617 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), | |
618 | dentry->d_parent->d_inode); | |
619 | } | |
620 | ||
d5719762 CM |
621 | return ret; |
622 | } | |
623 | ||
624 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
625 | struct dentry *dentry, struct inode *inode) | |
626 | { | |
627 | int err = btrfs_add_link(trans, dentry, inode); | |
628 | if (!err) { | |
629 | d_instantiate(dentry, inode); | |
630 | return 0; | |
631 | } | |
d5719762 CM |
632 | return err; |
633 | } | |
634 | ||
635 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
636 | int mode, struct nameidata *nd) | |
637 | { | |
638 | struct btrfs_trans_handle *trans; | |
639 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
640 | struct inode *inode; | |
641 | int err; | |
134e9731 | 642 | int drop_inode = 0; |
d5719762 | 643 | |
d561c025 | 644 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
645 | trans = btrfs_start_transaction(root, 1); |
646 | inode = btrfs_new_inode(trans, dir, mode); | |
647 | err = PTR_ERR(inode); | |
648 | if (IS_ERR(inode)) | |
d561c025 | 649 | goto out_unlock; |
d5719762 CM |
650 | // FIXME mark the inode dirty |
651 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
652 | if (err) |
653 | drop_inode = 1; | |
dee26a9f CM |
654 | else { |
655 | inode->i_mapping->a_ops = &btrfs_aops; | |
656 | inode->i_fop = &btrfs_file_operations; | |
657 | inode->i_op = &btrfs_file_inode_operations; | |
658 | } | |
d5719762 CM |
659 | dir->i_sb->s_dirt = 1; |
660 | btrfs_end_transaction(trans, root); | |
d561c025 CM |
661 | out_unlock: |
662 | mutex_unlock(&root->fs_info->fs_mutex); | |
134e9731 CM |
663 | if (drop_inode) { |
664 | inode_dec_link_count(inode); | |
665 | iput(inode); | |
666 | } | |
d5719762 CM |
667 | return err; |
668 | } | |
669 | ||
f7922033 CM |
670 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
671 | struct inode *inode, struct inode *dir) | |
672 | { | |
673 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
674 | int ret; | |
675 | char buf[2]; | |
676 | buf[0] = '.'; | |
677 | buf[1] = '.'; | |
678 | ||
679 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, | |
680 | inode->i_ino, 1); | |
681 | if (ret) | |
682 | goto error; | |
683 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, | |
684 | dir->i_ino, 1); | |
4730a4bc CM |
685 | if (ret) |
686 | goto error; | |
687 | inode->i_size = 3; | |
688 | ret = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
689 | error: |
690 | return ret; | |
691 | } | |
692 | ||
693 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
694 | { | |
695 | struct inode *inode; | |
696 | struct btrfs_trans_handle *trans; | |
697 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
698 | int err = 0; | |
699 | int drop_on_err = 0; | |
700 | ||
701 | mutex_lock(&root->fs_info->fs_mutex); | |
702 | trans = btrfs_start_transaction(root, 1); | |
703 | if (IS_ERR(trans)) { | |
704 | err = PTR_ERR(trans); | |
705 | goto out_unlock; | |
706 | } | |
707 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); | |
708 | if (IS_ERR(inode)) { | |
709 | err = PTR_ERR(inode); | |
710 | goto out_fail; | |
711 | } | |
712 | drop_on_err = 1; | |
713 | inode->i_op = &btrfs_dir_inode_operations; | |
714 | inode->i_fop = &btrfs_dir_file_operations; | |
715 | ||
716 | err = btrfs_make_empty_dir(trans, inode, dir); | |
717 | if (err) | |
718 | goto out_fail; | |
719 | err = btrfs_add_link(trans, dentry, inode); | |
720 | if (err) | |
721 | goto out_fail; | |
722 | d_instantiate(dentry, inode); | |
f7922033 CM |
723 | drop_on_err = 0; |
724 | ||
725 | out_fail: | |
726 | btrfs_end_transaction(trans, root); | |
727 | out_unlock: | |
728 | mutex_unlock(&root->fs_info->fs_mutex); | |
729 | if (drop_on_err) | |
730 | iput(inode); | |
731 | return err; | |
732 | } | |
733 | ||
d5719762 CM |
734 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
735 | { | |
736 | struct btrfs_trans_handle *trans; | |
737 | struct btrfs_root *root; | |
738 | int ret; | |
d98237b3 | 739 | root = btrfs_sb(sb); |
df2ce34c | 740 | |
d5719762 | 741 | sb->s_dirt = 0; |
d561c025 | 742 | if (!wait) { |
d98237b3 | 743 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
744 | return 0; |
745 | } | |
d98237b3 | 746 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
df2ce34c | 747 | |
d561c025 | 748 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
749 | trans = btrfs_start_transaction(root, 1); |
750 | ret = btrfs_commit_transaction(trans, root); | |
751 | sb->s_dirt = 0; | |
752 | BUG_ON(ret); | |
753 | printk("btrfs sync_fs\n"); | |
d561c025 | 754 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
755 | return 0; |
756 | } | |
757 | ||
dee26a9f CM |
758 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
759 | struct buffer_head *result, int create) | |
760 | { | |
761 | int ret; | |
762 | int err = 0; | |
763 | u64 blocknr; | |
764 | u64 extent_start = 0; | |
765 | u64 extent_end = 0; | |
766 | u64 objectid = inode->i_ino; | |
767 | struct btrfs_path path; | |
768 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
769 | struct btrfs_trans_handle *trans = NULL; | |
770 | struct btrfs_file_extent_item *item; | |
771 | struct btrfs_leaf *leaf; | |
772 | struct btrfs_disk_key *found_key; | |
773 | ||
774 | btrfs_init_path(&path); | |
775 | mutex_lock(&root->fs_info->fs_mutex); | |
776 | if (create) | |
777 | trans = btrfs_start_transaction(root, 1); | |
778 | ||
779 | ||
780 | ret = btrfs_lookup_file_extent(trans, root, &path, | |
9773a788 CM |
781 | inode->i_ino, |
782 | iblock << inode->i_blkbits, 0); | |
dee26a9f CM |
783 | if (ret < 0) { |
784 | btrfs_release_path(root, &path); | |
785 | err = ret; | |
786 | goto out; | |
787 | } | |
788 | ||
789 | if (ret != 0) { | |
790 | if (path.slots[0] == 0) { | |
791 | btrfs_release_path(root, &path); | |
792 | goto allocate; | |
793 | } | |
794 | path.slots[0]--; | |
795 | } | |
796 | ||
797 | item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
798 | struct btrfs_file_extent_item); | |
799 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
800 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
801 | blocknr += btrfs_file_extent_offset(item); | |
802 | ||
803 | /* exact match found, use it */ | |
804 | if (ret == 0) { | |
805 | err = 0; | |
806 | map_bh(result, inode->i_sb, blocknr); | |
807 | btrfs_release_path(root, &path); | |
808 | goto out; | |
809 | } | |
810 | ||
811 | /* are we inside the extent that was found? */ | |
812 | found_key = &leaf->items[path.slots[0]].key; | |
813 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
814 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { | |
815 | extent_end = 0; | |
816 | extent_start = 0; | |
817 | btrfs_release_path(root, &path); | |
818 | goto allocate; | |
819 | } | |
820 | ||
821 | extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key); | |
9773a788 | 822 | extent_start = extent_start >> inode->i_blkbits; |
dee26a9f CM |
823 | extent_start += btrfs_file_extent_offset(item); |
824 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
825 | btrfs_release_path(root, &path); | |
826 | if (iblock >= extent_start && iblock < extent_end) { | |
827 | err = 0; | |
828 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); | |
829 | goto out; | |
830 | } | |
831 | allocate: | |
832 | /* ok, create a new extent */ | |
833 | if (!create) { | |
834 | err = 0; | |
835 | goto out; | |
836 | } | |
9773a788 CM |
837 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
838 | iblock << inode->i_blkbits, | |
dee26a9f CM |
839 | 1, extent_end, &blocknr); |
840 | if (ret) { | |
841 | err = ret; | |
842 | goto out; | |
843 | } | |
f4b9aa8d CM |
844 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
845 | set_buffer_new(result); | |
dee26a9f CM |
846 | map_bh(result, inode->i_sb, blocknr); |
847 | ||
848 | out: | |
849 | if (trans) | |
850 | btrfs_end_transaction(trans, root); | |
851 | mutex_unlock(&root->fs_info->fs_mutex); | |
852 | return err; | |
853 | } | |
854 | ||
855 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
856 | unsigned from, unsigned to) | |
857 | { | |
6407bf6d | 858 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
859 | } |
860 | ||
d561c025 CM |
861 | static void btrfs_write_super(struct super_block *sb) |
862 | { | |
863 | btrfs_sync_fs(sb, 1); | |
864 | } | |
865 | ||
dee26a9f CM |
866 | static int btrfs_readpage(struct file *file, struct page *page) |
867 | { | |
868 | return mpage_readpage(page, btrfs_get_block); | |
869 | } | |
870 | ||
871 | static int btrfs_readpages(struct file *file, struct address_space *mapping, | |
872 | struct list_head *pages, unsigned nr_pages) | |
873 | { | |
874 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); | |
875 | } | |
876 | ||
877 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | |
878 | { | |
6407bf6d | 879 | return nobh_writepage(page, btrfs_get_block, wbc); |
dee26a9f | 880 | } |
d561c025 | 881 | |
f4b9aa8d CM |
882 | static void btrfs_truncate(struct inode *inode) |
883 | { | |
884 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
885 | int ret; | |
886 | struct btrfs_trans_handle *trans; | |
887 | ||
888 | if (!S_ISREG(inode->i_mode)) | |
889 | return; | |
890 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
891 | return; | |
892 | ||
893 | nobh_truncate_page(inode->i_mapping, inode->i_size); | |
894 | ||
895 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
896 | mutex_lock(&root->fs_info->fs_mutex); | |
897 | trans = btrfs_start_transaction(root, 1); | |
898 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
899 | BUG_ON(ret); | |
900 | ret = btrfs_end_transaction(trans, root); | |
901 | BUG_ON(ret); | |
902 | mutex_unlock(&root->fs_info->fs_mutex); | |
903 | mark_inode_dirty(inode); | |
904 | } | |
905 | ||
2e635a27 CM |
906 | static int btrfs_get_sb(struct file_system_type *fs_type, |
907 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
908 | { | |
909 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
910 | btrfs_fill_super, mnt); | |
911 | } | |
912 | ||
913 | static struct file_system_type btrfs_fs_type = { | |
914 | .owner = THIS_MODULE, | |
915 | .name = "btrfs", | |
916 | .get_sb = btrfs_get_sb, | |
917 | .kill_sb = kill_block_super, | |
918 | .fs_flags = FS_REQUIRES_DEV, | |
919 | }; | |
920 | ||
e20d96d6 CM |
921 | static struct super_operations btrfs_super_ops = { |
922 | .statfs = simple_statfs, | |
134e9731 | 923 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
924 | .put_super = btrfs_put_super, |
925 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
926 | .write_super = btrfs_write_super, |
927 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 928 | .write_inode = btrfs_write_inode, |
e20d96d6 CM |
929 | }; |
930 | ||
931 | static struct inode_operations btrfs_dir_inode_operations = { | |
932 | .lookup = btrfs_lookup, | |
d5719762 | 933 | .create = btrfs_create, |
134e9731 | 934 | .unlink = btrfs_unlink, |
f7922033 | 935 | .mkdir = btrfs_mkdir, |
5f443fd2 | 936 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
937 | }; |
938 | ||
939 | static struct file_operations btrfs_dir_file_operations = { | |
940 | .llseek = generic_file_llseek, | |
941 | .read = generic_read_dir, | |
942 | .readdir = btrfs_readdir, | |
943 | }; | |
944 | ||
dee26a9f CM |
945 | static struct address_space_operations btrfs_aops = { |
946 | .readpage = btrfs_readpage, | |
947 | .readpages = btrfs_readpages, | |
948 | .writepage = btrfs_writepage, | |
949 | .sync_page = block_sync_page, | |
950 | .prepare_write = btrfs_prepare_write, | |
6407bf6d | 951 | .commit_write = nobh_commit_write, |
dee26a9f CM |
952 | }; |
953 | ||
954 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 955 | .truncate = btrfs_truncate, |
dee26a9f CM |
956 | }; |
957 | ||
958 | static struct file_operations btrfs_file_operations = { | |
959 | .llseek = generic_file_llseek, | |
960 | .read = do_sync_read, | |
961 | .write = do_sync_write, | |
962 | .aio_read = generic_file_aio_read, | |
963 | .aio_write = generic_file_aio_write, | |
964 | .mmap = generic_file_mmap, | |
965 | .open = generic_file_open, | |
966 | .sendfile = generic_file_sendfile, | |
967 | .splice_read = generic_file_splice_read, | |
968 | .splice_write = generic_file_splice_write, | |
969 | }; | |
e20d96d6 | 970 | |
2e635a27 CM |
971 | static int __init init_btrfs_fs(void) |
972 | { | |
973 | printk("btrfs loaded!\n"); | |
974 | return register_filesystem(&btrfs_fs_type); | |
975 | } | |
976 | ||
977 | static void __exit exit_btrfs_fs(void) | |
978 | { | |
979 | unregister_filesystem(&btrfs_fs_type); | |
980 | printk("btrfs unloaded\n"); | |
981 | } | |
982 | ||
983 | module_init(init_btrfs_fs) | |
984 | module_exit(exit_btrfs_fs) | |
985 | ||
986 | MODULE_LICENSE("GPL"); |