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> |
75dfe396 CM |
12 | #include <linux/swap.h> |
13 | #include <linux/writeback.h> | |
2e635a27 | 14 | #include "ctree.h" |
e20d96d6 | 15 | #include "disk-io.h" |
d5719762 | 16 | #include "transaction.h" |
2e635a27 CM |
17 | |
18 | #define BTRFS_SUPER_MAGIC 0x9123682E | |
e20d96d6 CM |
19 | |
20 | static struct inode_operations btrfs_dir_inode_operations; | |
21 | static struct super_operations btrfs_super_ops; | |
22 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
23 | static struct inode_operations btrfs_file_inode_operations; |
24 | static struct address_space_operations btrfs_aops; | |
25 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 26 | |
e20d96d6 | 27 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 28 | { |
e20d96d6 CM |
29 | struct btrfs_path path; |
30 | struct btrfs_inode_item *inode_item; | |
31 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
32 | int ret; | |
f4b9aa8d | 33 | |
e20d96d6 | 34 | btrfs_init_path(&path); |
f4b9aa8d CM |
35 | mutex_lock(&root->fs_info->fs_mutex); |
36 | ||
e20d96d6 CM |
37 | ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0); |
38 | if (ret) { | |
78fae27e | 39 | btrfs_release_path(root, &path); |
f4b9aa8d CM |
40 | mutex_unlock(&root->fs_info->fs_mutex); |
41 | make_bad_inode(inode); | |
e20d96d6 CM |
42 | return; |
43 | } | |
44 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
45 | path.slots[0], | |
46 | struct btrfs_inode_item); | |
2e635a27 | 47 | |
e20d96d6 CM |
48 | inode->i_mode = btrfs_inode_mode(inode_item); |
49 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
50 | inode->i_uid = btrfs_inode_uid(inode_item); | |
51 | inode->i_gid = btrfs_inode_gid(inode_item); | |
52 | inode->i_size = btrfs_inode_size(inode_item); | |
53 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
54 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
55 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
56 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
57 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
58 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
59 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
60 | inode->i_generation = btrfs_inode_generation(inode_item); | |
e20d96d6 | 61 | btrfs_release_path(root, &path); |
f4b9aa8d | 62 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
63 | switch (inode->i_mode & S_IFMT) { |
64 | #if 0 | |
65 | default: | |
66 | init_special_inode(inode, inode->i_mode, | |
67 | btrfs_inode_rdev(inode_item)); | |
68 | break; | |
69 | #endif | |
70 | case S_IFREG: | |
dee26a9f CM |
71 | inode->i_mapping->a_ops = &btrfs_aops; |
72 | inode->i_fop = &btrfs_file_operations; | |
73 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
74 | break; |
75 | case S_IFDIR: | |
e20d96d6 CM |
76 | inode->i_op = &btrfs_dir_inode_operations; |
77 | inode->i_fop = &btrfs_dir_file_operations; | |
78 | break; | |
79 | case S_IFLNK: | |
e20d96d6 CM |
80 | // inode->i_op = &page_symlink_inode_operations; |
81 | break; | |
2e635a27 | 82 | } |
e20d96d6 | 83 | return; |
2e635a27 CM |
84 | } |
85 | ||
5f443fd2 CM |
86 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
87 | struct btrfs_root *root, | |
88 | struct inode *dir, | |
89 | struct dentry *dentry) | |
134e9731 CM |
90 | { |
91 | struct btrfs_path path; | |
134e9731 CM |
92 | const char *name = dentry->d_name.name; |
93 | int name_len = dentry->d_name.len; | |
94 | int ret; | |
95 | u64 objectid; | |
96 | struct btrfs_dir_item *di; | |
97 | ||
98 | btrfs_init_path(&path); | |
134e9731 CM |
99 | ret = btrfs_lookup_dir_item(trans, root, &path, dir->i_ino, |
100 | name, name_len, -1); | |
101 | if (ret < 0) | |
102 | goto err; | |
103 | if (ret > 0) { | |
104 | ret = -ENOENT; | |
105 | goto err; | |
106 | } | |
107 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
108 | struct btrfs_dir_item); | |
109 | objectid = btrfs_dir_objectid(di); | |
110 | ||
111 | ret = btrfs_del_item(trans, root, &path); | |
112 | BUG_ON(ret); | |
113 | dentry->d_inode->i_ctime = dir->i_ctime; | |
114 | err: | |
115 | btrfs_release_path(root, &path); | |
134e9731 CM |
116 | if (ret == 0) |
117 | inode_dec_link_count(dentry->d_inode); | |
118 | return ret; | |
119 | } | |
120 | ||
5f443fd2 CM |
121 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
122 | { | |
123 | struct btrfs_root *root; | |
124 | struct btrfs_trans_handle *trans; | |
125 | int ret; | |
126 | ||
127 | root = btrfs_sb(dir->i_sb); | |
128 | mutex_lock(&root->fs_info->fs_mutex); | |
129 | trans = btrfs_start_transaction(root, 1); | |
130 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
131 | btrfs_end_transaction(trans, root); | |
132 | mutex_unlock(&root->fs_info->fs_mutex); | |
133 | return ret; | |
134 | } | |
135 | ||
136 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
137 | { | |
138 | struct inode *inode = dentry->d_inode; | |
139 | int err; | |
140 | int ret; | |
141 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
142 | struct btrfs_path path; | |
143 | struct btrfs_key key; | |
144 | struct btrfs_trans_handle *trans; | |
145 | struct btrfs_disk_key *found_key; | |
146 | struct btrfs_leaf *leaf; | |
147 | ||
148 | btrfs_init_path(&path); | |
149 | mutex_lock(&root->fs_info->fs_mutex); | |
150 | trans = btrfs_start_transaction(root, 1); | |
151 | key.objectid = inode->i_ino; | |
152 | key.offset = (u64)-1; | |
153 | key.flags = 0; | |
154 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
155 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
156 | if (ret < 0) { | |
157 | err = ret; | |
158 | goto out; | |
159 | } | |
160 | ||
161 | BUG_ON(ret == 0); | |
162 | BUG_ON(path.slots[0] == 0); | |
163 | path.slots[0]--; | |
164 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
165 | found_key = &leaf->items[path.slots[0]].key; | |
166 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) { | |
167 | err = -ENOENT; | |
168 | goto out; | |
169 | } | |
170 | if (btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY || | |
171 | btrfs_disk_key_offset(found_key) != 2) { | |
172 | err = -ENOTEMPTY; | |
173 | goto out; | |
174 | } | |
175 | ret = btrfs_del_item(trans, root, &path); | |
176 | BUG_ON(ret); | |
177 | btrfs_release_path(root, &path); | |
178 | key.offset = 1; | |
179 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
180 | if (ret < 0) { | |
181 | err = ret; | |
182 | goto out; | |
183 | } | |
184 | if (ret > 0) { | |
185 | err = -ENOTEMPTY; | |
186 | goto out; | |
187 | } | |
188 | ret = btrfs_del_item(trans, root, &path); | |
189 | if (ret) { | |
190 | err = ret; | |
191 | goto out; | |
192 | } | |
193 | btrfs_release_path(root, &path); | |
194 | ||
195 | /* now the directory is empty */ | |
196 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
197 | if (!err) { | |
198 | inode->i_size = 0; | |
199 | } | |
200 | out: | |
201 | mutex_unlock(&root->fs_info->fs_mutex); | |
202 | ret = btrfs_end_transaction(trans, root); | |
203 | if (ret && !err) | |
204 | err = ret; | |
205 | return err; | |
206 | } | |
207 | ||
134e9731 CM |
208 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
209 | struct btrfs_root *root, | |
210 | struct inode *inode) | |
211 | { | |
212 | u64 objectid = inode->i_ino; | |
213 | struct btrfs_path path; | |
214 | struct btrfs_inode_map_item *map; | |
215 | struct btrfs_key stat_data_key; | |
216 | int ret; | |
217 | clear_inode(inode); | |
218 | btrfs_init_path(&path); | |
219 | ret = btrfs_lookup_inode_map(trans, root, &path, objectid, -1); | |
220 | if (ret) { | |
221 | if (ret > 0) | |
222 | ret = -ENOENT; | |
223 | btrfs_release_path(root, &path); | |
224 | goto error; | |
225 | } | |
226 | map = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
227 | struct btrfs_inode_map_item); | |
228 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); | |
229 | ret = btrfs_del_item(trans, root->fs_info->inode_root, &path); | |
230 | BUG_ON(ret); | |
231 | btrfs_release_path(root, &path); | |
232 | btrfs_init_path(&path); | |
233 | ||
234 | ret = btrfs_lookup_inode(trans, root, &path, objectid, -1); | |
235 | BUG_ON(ret); | |
236 | ret = btrfs_del_item(trans, root, &path); | |
237 | BUG_ON(ret); | |
238 | btrfs_release_path(root, &path); | |
239 | error: | |
240 | return ret; | |
241 | } | |
242 | ||
f4b9aa8d CM |
243 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
244 | struct btrfs_root *root, | |
245 | struct inode *inode) | |
246 | { | |
247 | int ret; | |
248 | struct btrfs_path path; | |
249 | struct btrfs_key key; | |
250 | struct btrfs_disk_key *found_key; | |
251 | struct btrfs_leaf *leaf; | |
f254e52c CM |
252 | struct btrfs_file_extent_item *fi = NULL; |
253 | u64 extent_start = 0; | |
254 | u64 extent_num_blocks = 0; | |
255 | int found_extent; | |
f4b9aa8d CM |
256 | |
257 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
258 | key.objectid = inode->i_ino; | |
259 | key.offset = (u64)-1; | |
260 | key.flags = 0; | |
f254e52c | 261 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d CM |
262 | while(1) { |
263 | btrfs_init_path(&path); | |
264 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
265 | if (ret < 0) { | |
266 | btrfs_release_path(root, &path); | |
267 | goto error; | |
268 | } | |
269 | if (ret > 0) { | |
270 | BUG_ON(path.slots[0] == 0); | |
271 | path.slots[0]--; | |
272 | } | |
273 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
274 | found_key = &leaf->items[path.slots[0]].key; | |
275 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) | |
276 | break; | |
f254e52c CM |
277 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
278 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 279 | break; |
f4b9aa8d CM |
280 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
281 | break; | |
f254e52c CM |
282 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
283 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
284 | path.slots[0], | |
285 | struct btrfs_file_extent_item); | |
286 | extent_start = btrfs_file_extent_disk_blocknr(fi); | |
287 | extent_num_blocks = | |
288 | btrfs_file_extent_disk_num_blocks(fi); | |
289 | inode->i_blocks -= | |
290 | btrfs_file_extent_num_blocks(fi) >> 9; | |
291 | found_extent = 1; | |
292 | } else { | |
293 | found_extent = 0; | |
294 | } | |
f4b9aa8d CM |
295 | ret = btrfs_del_item(trans, root, &path); |
296 | BUG_ON(ret); | |
f4b9aa8d | 297 | btrfs_release_path(root, &path); |
f254e52c CM |
298 | if (found_extent) { |
299 | ret = btrfs_free_extent(trans, root, extent_start, | |
300 | extent_num_blocks, 0); | |
301 | BUG_ON(ret); | |
302 | } | |
f4b9aa8d CM |
303 | } |
304 | btrfs_release_path(root, &path); | |
305 | ret = 0; | |
306 | error: | |
307 | return ret; | |
308 | } | |
309 | ||
134e9731 CM |
310 | static void btrfs_delete_inode(struct inode *inode) |
311 | { | |
312 | struct btrfs_trans_handle *trans; | |
313 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
f4b9aa8d CM |
314 | int ret; |
315 | ||
134e9731 CM |
316 | truncate_inode_pages(&inode->i_data, 0); |
317 | if (is_bad_inode(inode)) { | |
318 | goto no_delete; | |
319 | } | |
320 | inode->i_size = 0; | |
134e9731 CM |
321 | mutex_lock(&root->fs_info->fs_mutex); |
322 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
323 | if (S_ISREG(inode->i_mode)) { |
324 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
325 | BUG_ON(ret); | |
326 | } | |
134e9731 CM |
327 | btrfs_free_inode(trans, root, inode); |
328 | btrfs_end_transaction(trans, root); | |
329 | mutex_unlock(&root->fs_info->fs_mutex); | |
330 | return; | |
331 | no_delete: | |
332 | clear_inode(inode); | |
333 | } | |
334 | ||
e20d96d6 CM |
335 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
336 | ino_t *ino) | |
337 | { | |
338 | const char *name = dentry->d_name.name; | |
339 | int namelen = dentry->d_name.len; | |
340 | struct btrfs_dir_item *di; | |
341 | struct btrfs_path path; | |
342 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
343 | int ret; | |
344 | ||
345 | btrfs_init_path(&path); | |
346 | ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, | |
347 | namelen, 0); | |
7f5c1516 | 348 | if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) { |
e20d96d6 CM |
349 | *ino = 0; |
350 | goto out; | |
351 | } | |
352 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
353 | struct btrfs_dir_item); | |
354 | *ino = btrfs_dir_objectid(di); | |
355 | out: | |
356 | btrfs_release_path(root, &path); | |
357 | return ret; | |
358 | } | |
359 | ||
360 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
361 | struct nameidata *nd) | |
362 | { | |
363 | struct inode * inode; | |
364 | ino_t ino; | |
365 | int ret; | |
366 | ||
367 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
368 | return ERR_PTR(-ENAMETOOLONG); | |
369 | ||
370 | ret = btrfs_inode_by_name(dir, dentry, &ino); | |
371 | if (ret < 0) | |
372 | return ERR_PTR(ret); | |
373 | inode = NULL; | |
374 | if (ino) { | |
e20d96d6 CM |
375 | inode = iget(dir->i_sb, ino); |
376 | if (!inode) | |
377 | return ERR_PTR(-EACCES); | |
378 | } | |
379 | return d_splice_alias(inode, dentry); | |
380 | } | |
381 | ||
382 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
383 | { | |
384 | struct inode *inode = filp->f_path.dentry->d_inode; | |
385 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
386 | struct btrfs_item *item; | |
387 | struct btrfs_dir_item *di; | |
388 | struct btrfs_key key; | |
389 | struct btrfs_path path; | |
390 | int ret; | |
391 | u32 nritems; | |
392 | struct btrfs_leaf *leaf; | |
393 | int slot; | |
394 | int advance; | |
395 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 396 | int over = 0; |
e20d96d6 CM |
397 | |
398 | key.objectid = inode->i_ino; | |
e20d96d6 CM |
399 | key.flags = 0; |
400 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
401 | key.offset = filp->f_pos; | |
402 | btrfs_init_path(&path); | |
403 | ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); | |
404 | if (ret < 0) { | |
405 | goto err; | |
406 | } | |
7f5c1516 | 407 | advance = 0; |
e20d96d6 CM |
408 | while(1) { |
409 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
410 | nritems = btrfs_header_nritems(&leaf->header); | |
411 | slot = path.slots[0]; | |
dee26a9f CM |
412 | if (advance || slot >= nritems) { |
413 | if (slot >= nritems -1) { | |
e20d96d6 CM |
414 | ret = btrfs_next_leaf(root, &path); |
415 | if (ret) | |
416 | break; | |
417 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
418 | nritems = btrfs_header_nritems(&leaf->header); | |
419 | slot = path.slots[0]; | |
e20d96d6 CM |
420 | } else { |
421 | slot++; | |
422 | path.slots[0]++; | |
423 | } | |
424 | } | |
425 | advance = 1; | |
426 | item = leaf->items + slot; | |
e20d96d6 CM |
427 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
428 | break; | |
429 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) | |
430 | continue; | |
7f5c1516 CM |
431 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
432 | continue; | |
dee26a9f CM |
433 | |
434 | advance = 1; | |
e20d96d6 | 435 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
436 | over = filldir(dirent, (const char *)(di + 1), |
437 | btrfs_dir_name_len(di), | |
438 | btrfs_disk_key_offset(&item->key), | |
439 | btrfs_dir_objectid(di), d_type); | |
7f5c1516 CM |
440 | if (over) { |
441 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
e20d96d6 | 442 | break; |
7f5c1516 | 443 | } |
e20d96d6 CM |
444 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
445 | } | |
e20d96d6 CM |
446 | ret = 0; |
447 | err: | |
448 | btrfs_release_path(root, &path); | |
449 | return ret; | |
450 | } | |
451 | ||
452 | static void btrfs_put_super (struct super_block * sb) | |
453 | { | |
454 | struct btrfs_root *root = btrfs_sb(sb); | |
455 | int ret; | |
456 | ||
457 | ret = close_ctree(root); | |
458 | if (ret) { | |
459 | printk("close ctree returns %d\n", ret); | |
460 | } | |
461 | sb->s_fs_info = NULL; | |
462 | } | |
2e635a27 CM |
463 | |
464 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
465 | { | |
466 | struct inode * inode; | |
e20d96d6 CM |
467 | struct dentry * root_dentry; |
468 | struct btrfs_super_block *disk_super; | |
469 | struct buffer_head *bh; | |
470 | struct btrfs_root *root; | |
2e635a27 CM |
471 | |
472 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
473 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
474 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
475 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
e20d96d6 | 476 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 477 | sb->s_time_gran = 1; |
e20d96d6 CM |
478 | |
479 | bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); | |
480 | if (!bh) { | |
481 | printk("btrfs: unable to read on disk super\n"); | |
482 | return -EIO; | |
483 | } | |
484 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
485 | root = open_ctree(sb, bh, disk_super); | |
d98237b3 | 486 | |
e20d96d6 CM |
487 | if (!root) { |
488 | printk("btrfs: open_ctree failed\n"); | |
489 | return -EIO; | |
490 | } | |
87cbda5c CM |
491 | sb->s_fs_info = root; |
492 | disk_super = root->fs_info->disk_super; | |
e20d96d6 CM |
493 | printk("read in super total blocks %Lu root %Lu\n", |
494 | btrfs_super_total_blocks(disk_super), | |
495 | btrfs_super_root_dir(disk_super)); | |
496 | ||
497 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
2e635a27 CM |
498 | if (!inode) |
499 | return -ENOMEM; | |
e20d96d6 CM |
500 | if (inode->i_state & I_NEW) { |
501 | btrfs_read_locked_inode(inode); | |
502 | unlock_new_inode(inode); | |
503 | } | |
2e635a27 | 504 | |
e20d96d6 CM |
505 | root_dentry = d_alloc_root(inode); |
506 | if (!root_dentry) { | |
2e635a27 CM |
507 | iput(inode); |
508 | return -ENOMEM; | |
509 | } | |
e20d96d6 CM |
510 | sb->s_root = root_dentry; |
511 | ||
2e635a27 CM |
512 | return 0; |
513 | } | |
514 | ||
d5719762 CM |
515 | static void fill_inode_item(struct btrfs_inode_item *item, |
516 | struct inode *inode) | |
517 | { | |
518 | btrfs_set_inode_uid(item, inode->i_uid); | |
519 | btrfs_set_inode_gid(item, inode->i_gid); | |
520 | btrfs_set_inode_size(item, inode->i_size); | |
521 | btrfs_set_inode_mode(item, inode->i_mode); | |
522 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
523 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
524 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
525 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
526 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
527 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
528 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
529 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
530 | btrfs_set_inode_generation(item, inode->i_generation); | |
531 | } | |
532 | ||
4730a4bc CM |
533 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
534 | struct btrfs_root *root, | |
535 | struct inode *inode) | |
536 | { | |
537 | struct btrfs_inode_item *inode_item; | |
538 | struct btrfs_path path; | |
539 | int ret; | |
540 | ||
541 | btrfs_init_path(&path); | |
542 | ||
543 | ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1); | |
544 | if (ret) { | |
545 | if (ret > 0) | |
546 | ret = -ENOENT; | |
547 | goto failed; | |
548 | } | |
549 | ||
550 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
551 | path.slots[0], | |
552 | struct btrfs_inode_item); | |
553 | ||
554 | fill_inode_item(inode_item, inode); | |
555 | mark_buffer_dirty(path.nodes[0]); | |
556 | failed: | |
557 | btrfs_release_path(root, &path); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | static int btrfs_write_inode(struct inode *inode, int wait) | |
562 | { | |
563 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
564 | struct btrfs_trans_handle *trans; | |
565 | int ret; | |
566 | ||
567 | mutex_lock(&root->fs_info->fs_mutex); | |
568 | trans = btrfs_start_transaction(root, 1); | |
569 | ret = btrfs_update_inode(trans, root, inode); | |
570 | if (wait) | |
571 | btrfs_commit_transaction(trans, root); | |
572 | else | |
573 | btrfs_end_transaction(trans, root); | |
574 | mutex_unlock(&root->fs_info->fs_mutex); | |
575 | return ret; | |
576 | } | |
577 | ||
d5719762 CM |
578 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
579 | struct inode *dir, int mode) | |
580 | { | |
581 | struct inode *inode; | |
582 | struct btrfs_inode_item inode_item; | |
583 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
584 | struct btrfs_key key; | |
585 | int ret; | |
586 | u64 objectid; | |
587 | ||
588 | inode = new_inode(dir->i_sb); | |
589 | if (!inode) | |
590 | return ERR_PTR(-ENOMEM); | |
591 | ||
592 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
593 | BUG_ON(ret); | |
594 | ||
595 | inode->i_uid = current->fsuid; | |
596 | inode->i_gid = current->fsgid; | |
597 | inode->i_mode = mode; | |
598 | inode->i_ino = objectid; | |
599 | inode->i_blocks = 0; | |
600 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
601 | fill_inode_item(&inode_item, inode); | |
602 | ||
d5719762 CM |
603 | key.objectid = objectid; |
604 | key.flags = 0; | |
605 | key.offset = 0; | |
606 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
607 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
608 | BUG_ON(ret); | |
609 | ||
610 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
611 | BUG_ON(ret); | |
612 | ||
613 | insert_inode_hash(inode); | |
d5719762 CM |
614 | return inode; |
615 | } | |
616 | ||
617 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
618 | struct dentry *dentry, struct inode *inode) | |
619 | { | |
620 | int ret; | |
621 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
622 | dentry->d_name.name, dentry->d_name.len, | |
623 | dentry->d_parent->d_inode->i_ino, | |
624 | inode->i_ino, 0); | |
4730a4bc CM |
625 | if (ret == 0) { |
626 | dentry->d_parent->d_inode->i_size += dentry->d_name.len; | |
627 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), | |
628 | dentry->d_parent->d_inode); | |
629 | } | |
630 | ||
d5719762 CM |
631 | return ret; |
632 | } | |
633 | ||
634 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
635 | struct dentry *dentry, struct inode *inode) | |
636 | { | |
637 | int err = btrfs_add_link(trans, dentry, inode); | |
638 | if (!err) { | |
639 | d_instantiate(dentry, inode); | |
640 | return 0; | |
641 | } | |
d5719762 CM |
642 | return err; |
643 | } | |
644 | ||
645 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
646 | int mode, struct nameidata *nd) | |
647 | { | |
648 | struct btrfs_trans_handle *trans; | |
649 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
650 | struct inode *inode; | |
651 | int err; | |
134e9731 | 652 | int drop_inode = 0; |
d5719762 | 653 | |
d561c025 | 654 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
655 | trans = btrfs_start_transaction(root, 1); |
656 | inode = btrfs_new_inode(trans, dir, mode); | |
657 | err = PTR_ERR(inode); | |
658 | if (IS_ERR(inode)) | |
d561c025 | 659 | goto out_unlock; |
d5719762 CM |
660 | // FIXME mark the inode dirty |
661 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
662 | if (err) |
663 | drop_inode = 1; | |
dee26a9f CM |
664 | else { |
665 | inode->i_mapping->a_ops = &btrfs_aops; | |
666 | inode->i_fop = &btrfs_file_operations; | |
667 | inode->i_op = &btrfs_file_inode_operations; | |
668 | } | |
d5719762 CM |
669 | dir->i_sb->s_dirt = 1; |
670 | btrfs_end_transaction(trans, root); | |
d561c025 CM |
671 | out_unlock: |
672 | mutex_unlock(&root->fs_info->fs_mutex); | |
134e9731 CM |
673 | if (drop_inode) { |
674 | inode_dec_link_count(inode); | |
675 | iput(inode); | |
676 | } | |
d5719762 CM |
677 | return err; |
678 | } | |
679 | ||
f7922033 CM |
680 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
681 | struct inode *inode, struct inode *dir) | |
682 | { | |
683 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
684 | int ret; | |
685 | char buf[2]; | |
686 | buf[0] = '.'; | |
687 | buf[1] = '.'; | |
688 | ||
689 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, | |
690 | inode->i_ino, 1); | |
691 | if (ret) | |
692 | goto error; | |
693 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, | |
694 | dir->i_ino, 1); | |
4730a4bc CM |
695 | if (ret) |
696 | goto error; | |
697 | inode->i_size = 3; | |
698 | ret = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
699 | error: |
700 | return ret; | |
701 | } | |
702 | ||
703 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
704 | { | |
705 | struct inode *inode; | |
706 | struct btrfs_trans_handle *trans; | |
707 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
708 | int err = 0; | |
709 | int drop_on_err = 0; | |
710 | ||
711 | mutex_lock(&root->fs_info->fs_mutex); | |
712 | trans = btrfs_start_transaction(root, 1); | |
713 | if (IS_ERR(trans)) { | |
714 | err = PTR_ERR(trans); | |
715 | goto out_unlock; | |
716 | } | |
717 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); | |
718 | if (IS_ERR(inode)) { | |
719 | err = PTR_ERR(inode); | |
720 | goto out_fail; | |
721 | } | |
722 | drop_on_err = 1; | |
723 | inode->i_op = &btrfs_dir_inode_operations; | |
724 | inode->i_fop = &btrfs_dir_file_operations; | |
725 | ||
726 | err = btrfs_make_empty_dir(trans, inode, dir); | |
727 | if (err) | |
728 | goto out_fail; | |
729 | err = btrfs_add_link(trans, dentry, inode); | |
730 | if (err) | |
731 | goto out_fail; | |
732 | d_instantiate(dentry, inode); | |
f7922033 CM |
733 | drop_on_err = 0; |
734 | ||
735 | out_fail: | |
736 | btrfs_end_transaction(trans, root); | |
737 | out_unlock: | |
738 | mutex_unlock(&root->fs_info->fs_mutex); | |
739 | if (drop_on_err) | |
740 | iput(inode); | |
741 | return err; | |
742 | } | |
743 | ||
d5719762 CM |
744 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
745 | { | |
746 | struct btrfs_trans_handle *trans; | |
747 | struct btrfs_root *root; | |
748 | int ret; | |
d98237b3 | 749 | root = btrfs_sb(sb); |
df2ce34c | 750 | |
d5719762 | 751 | sb->s_dirt = 0; |
d561c025 | 752 | if (!wait) { |
d98237b3 | 753 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
754 | return 0; |
755 | } | |
d98237b3 | 756 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
df2ce34c | 757 | |
d561c025 | 758 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
759 | trans = btrfs_start_transaction(root, 1); |
760 | ret = btrfs_commit_transaction(trans, root); | |
761 | sb->s_dirt = 0; | |
762 | BUG_ON(ret); | |
763 | printk("btrfs sync_fs\n"); | |
d561c025 | 764 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
765 | return 0; |
766 | } | |
767 | ||
75dfe396 | 768 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
769 | struct buffer_head *result, int create) |
770 | { | |
771 | int ret; | |
772 | int err = 0; | |
773 | u64 blocknr; | |
774 | u64 extent_start = 0; | |
775 | u64 extent_end = 0; | |
776 | u64 objectid = inode->i_ino; | |
777 | struct btrfs_path path; | |
778 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
779 | struct btrfs_trans_handle *trans = NULL; | |
780 | struct btrfs_file_extent_item *item; | |
781 | struct btrfs_leaf *leaf; | |
782 | struct btrfs_disk_key *found_key; | |
783 | ||
784 | btrfs_init_path(&path); | |
dee26a9f CM |
785 | if (create) |
786 | trans = btrfs_start_transaction(root, 1); | |
787 | ||
788 | ||
789 | ret = btrfs_lookup_file_extent(trans, root, &path, | |
9773a788 CM |
790 | inode->i_ino, |
791 | iblock << inode->i_blkbits, 0); | |
dee26a9f CM |
792 | if (ret < 0) { |
793 | btrfs_release_path(root, &path); | |
794 | err = ret; | |
795 | goto out; | |
796 | } | |
797 | ||
798 | if (ret != 0) { | |
799 | if (path.slots[0] == 0) { | |
800 | btrfs_release_path(root, &path); | |
801 | goto allocate; | |
802 | } | |
803 | path.slots[0]--; | |
804 | } | |
805 | ||
806 | item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
807 | struct btrfs_file_extent_item); | |
808 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
809 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
810 | blocknr += btrfs_file_extent_offset(item); | |
811 | ||
812 | /* exact match found, use it */ | |
813 | if (ret == 0) { | |
814 | err = 0; | |
815 | map_bh(result, inode->i_sb, blocknr); | |
816 | btrfs_release_path(root, &path); | |
817 | goto out; | |
818 | } | |
819 | ||
820 | /* are we inside the extent that was found? */ | |
821 | found_key = &leaf->items[path.slots[0]].key; | |
822 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
823 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { | |
824 | extent_end = 0; | |
825 | extent_start = 0; | |
826 | btrfs_release_path(root, &path); | |
827 | goto allocate; | |
828 | } | |
829 | ||
830 | extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key); | |
9773a788 | 831 | extent_start = extent_start >> inode->i_blkbits; |
dee26a9f CM |
832 | extent_start += btrfs_file_extent_offset(item); |
833 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
834 | btrfs_release_path(root, &path); | |
835 | if (iblock >= extent_start && iblock < extent_end) { | |
836 | err = 0; | |
837 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); | |
838 | goto out; | |
839 | } | |
840 | allocate: | |
841 | /* ok, create a new extent */ | |
842 | if (!create) { | |
843 | err = 0; | |
844 | goto out; | |
845 | } | |
9773a788 CM |
846 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
847 | iblock << inode->i_blkbits, | |
dee26a9f CM |
848 | 1, extent_end, &blocknr); |
849 | if (ret) { | |
850 | err = ret; | |
851 | goto out; | |
852 | } | |
f4b9aa8d CM |
853 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
854 | set_buffer_new(result); | |
dee26a9f CM |
855 | map_bh(result, inode->i_sb, blocknr); |
856 | ||
857 | out: | |
858 | if (trans) | |
859 | btrfs_end_transaction(trans, root); | |
75dfe396 CM |
860 | return err; |
861 | } | |
862 | ||
863 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
864 | struct buffer_head *result, int create) | |
865 | { | |
866 | int err; | |
867 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
868 | mutex_lock(&root->fs_info->fs_mutex); | |
869 | err = btrfs_get_block_lock(inode, iblock, result, create); | |
dee26a9f CM |
870 | mutex_unlock(&root->fs_info->fs_mutex); |
871 | return err; | |
872 | } | |
873 | ||
874 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
875 | unsigned from, unsigned to) | |
876 | { | |
75dfe396 | 877 | WARN_ON(1); |
6407bf6d | 878 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f | 879 | } |
75dfe396 CM |
880 | static int btrfs_commit_write(struct file *file, struct page *page, |
881 | unsigned from, unsigned to) | |
882 | { | |
883 | WARN_ON(1); | |
884 | return nobh_commit_write(file, page, from, to); | |
885 | } | |
dee26a9f | 886 | |
d561c025 CM |
887 | static void btrfs_write_super(struct super_block *sb) |
888 | { | |
889 | btrfs_sync_fs(sb, 1); | |
890 | } | |
891 | ||
dee26a9f CM |
892 | static int btrfs_readpage(struct file *file, struct page *page) |
893 | { | |
894 | return mpage_readpage(page, btrfs_get_block); | |
895 | } | |
896 | ||
897 | static int btrfs_readpages(struct file *file, struct address_space *mapping, | |
898 | struct list_head *pages, unsigned nr_pages) | |
899 | { | |
900 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); | |
901 | } | |
902 | ||
903 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | |
904 | { | |
6407bf6d | 905 | return nobh_writepage(page, btrfs_get_block, wbc); |
dee26a9f | 906 | } |
d561c025 | 907 | |
f4b9aa8d CM |
908 | static void btrfs_truncate(struct inode *inode) |
909 | { | |
910 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
911 | int ret; | |
912 | struct btrfs_trans_handle *trans; | |
913 | ||
914 | if (!S_ISREG(inode->i_mode)) | |
915 | return; | |
916 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
917 | return; | |
918 | ||
919 | nobh_truncate_page(inode->i_mapping, inode->i_size); | |
920 | ||
921 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
922 | mutex_lock(&root->fs_info->fs_mutex); | |
923 | trans = btrfs_start_transaction(root, 1); | |
924 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
925 | BUG_ON(ret); | |
926 | ret = btrfs_end_transaction(trans, root); | |
927 | BUG_ON(ret); | |
928 | mutex_unlock(&root->fs_info->fs_mutex); | |
929 | mark_inode_dirty(inode); | |
930 | } | |
931 | ||
75dfe396 CM |
932 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
933 | struct page **prepared_pages, | |
934 | const char __user * buf) | |
935 | { | |
936 | long page_fault = 0; | |
937 | int i; | |
938 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
939 | ||
940 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
941 | size_t count = min_t(size_t, | |
942 | PAGE_CACHE_SIZE - offset, write_bytes); | |
943 | struct page *page = prepared_pages[i]; | |
944 | fault_in_pages_readable(buf, count); | |
945 | ||
946 | /* Copy data from userspace to the current page */ | |
947 | kmap(page); | |
948 | page_fault = __copy_from_user(page_address(page) + offset, | |
949 | buf, count); | |
950 | /* Flush processor's dcache for this page */ | |
951 | flush_dcache_page(page); | |
952 | kunmap(page); | |
953 | buf += count; | |
954 | write_bytes -= count; | |
955 | ||
956 | if (page_fault) | |
957 | break; | |
958 | } | |
959 | return page_fault ? -EFAULT : 0; | |
960 | } | |
961 | ||
962 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
963 | { | |
964 | size_t i; | |
965 | for (i = 0; i < num_pages; i++) { | |
966 | if (!pages[i]) | |
967 | break; | |
968 | unlock_page(pages[i]); | |
969 | mark_page_accessed(pages[i]); | |
970 | page_cache_release(pages[i]); | |
971 | } | |
972 | } | |
973 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
974 | struct btrfs_root *root, | |
975 | struct file *file, | |
976 | struct page **pages, | |
977 | size_t num_pages, | |
978 | loff_t pos, | |
979 | size_t write_bytes) | |
980 | { | |
981 | int i; | |
982 | int offset; | |
983 | int err = 0; | |
984 | int ret; | |
985 | int this_write; | |
f254e52c | 986 | struct inode *inode = file->f_path.dentry->d_inode; |
75dfe396 CM |
987 | |
988 | for (i = 0; i < num_pages; i++) { | |
989 | offset = pos & (PAGE_CACHE_SIZE -1); | |
990 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
991 | /* FIXME, one block at a time */ |
992 | ||
993 | mutex_lock(&root->fs_info->fs_mutex); | |
994 | trans = btrfs_start_transaction(root, 1); | |
995 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
996 | pages[i]->index << PAGE_CACHE_SHIFT, | |
997 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
998 | kunmap(pages[i]); | |
999 | SetPageChecked(pages[i]); | |
1000 | ret = btrfs_end_transaction(trans, root); | |
1001 | BUG_ON(ret); | |
1002 | mutex_unlock(&root->fs_info->fs_mutex); | |
1003 | ||
75dfe396 CM |
1004 | ret = nobh_commit_write(file, pages[i], offset, |
1005 | offset + this_write); | |
1006 | pos += this_write; | |
1007 | if (ret) { | |
1008 | err = ret; | |
1009 | goto failed; | |
1010 | } | |
1011 | WARN_ON(this_write > write_bytes); | |
1012 | write_bytes -= this_write; | |
1013 | } | |
1014 | failed: | |
1015 | return err; | |
1016 | } | |
1017 | ||
1018 | static int prepare_pages(struct btrfs_trans_handle *trans, | |
1019 | struct btrfs_root *root, | |
1020 | struct file *file, | |
1021 | struct page **pages, | |
1022 | size_t num_pages, | |
1023 | loff_t pos, | |
1024 | size_t write_bytes) | |
1025 | { | |
1026 | int i; | |
1027 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1028 | struct inode *inode = file->f_path.dentry->d_inode; | |
1029 | int offset; | |
1030 | int err = 0; | |
1031 | int ret; | |
1032 | int this_write; | |
1033 | loff_t isize = i_size_read(inode); | |
1034 | ||
1035 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1036 | ||
1037 | for (i = 0; i < num_pages; i++) { | |
1038 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1039 | if (!pages[i]) { | |
1040 | err = -ENOMEM; | |
1041 | goto failed_release; | |
1042 | } | |
1043 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1044 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
1045 | ret = nobh_prepare_write(pages[i], offset, | |
1046 | offset + this_write, | |
f254e52c | 1047 | btrfs_get_block); |
75dfe396 CM |
1048 | pos += this_write; |
1049 | if (ret) { | |
1050 | err = ret; | |
1051 | goto failed_truncate; | |
1052 | } | |
1053 | WARN_ON(this_write > write_bytes); | |
1054 | write_bytes -= this_write; | |
1055 | } | |
1056 | return 0; | |
1057 | ||
1058 | failed_release: | |
1059 | btrfs_drop_pages(pages, num_pages); | |
1060 | return err; | |
1061 | ||
1062 | failed_truncate: | |
1063 | btrfs_drop_pages(pages, num_pages); | |
1064 | if (pos > isize) | |
1065 | vmtruncate(inode, isize); | |
1066 | return err; | |
1067 | } | |
1068 | ||
1069 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1070 | size_t count, loff_t *ppos) | |
1071 | { | |
1072 | loff_t pos; | |
1073 | size_t num_written = 0; | |
1074 | int err = 0; | |
1075 | int ret = 0; | |
75dfe396 CM |
1076 | struct inode *inode = file->f_path.dentry->d_inode; |
1077 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
1078 | struct page *pages[1]; | |
1079 | ||
1080 | if (file->f_flags & O_DIRECT) | |
1081 | return -EINVAL; | |
1082 | pos = *ppos; | |
1083 | ||
1084 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1085 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1086 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1087 | if (err) | |
1088 | goto out; | |
1089 | if (count == 0) | |
1090 | goto out; | |
1091 | err = remove_suid(file->f_path.dentry); | |
1092 | if (err) | |
1093 | goto out; | |
1094 | file_update_time(file); | |
1095 | mutex_lock(&inode->i_mutex); | |
1096 | while(count > 0) { | |
1097 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1098 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1099 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1100 | PAGE_CACHE_SHIFT; | |
f254e52c | 1101 | ret = prepare_pages(NULL, root, file, pages, num_pages, |
75dfe396 CM |
1102 | pos, write_bytes); |
1103 | BUG_ON(ret); | |
1104 | ret = btrfs_copy_from_user(pos, num_pages, | |
1105 | write_bytes, pages, buf); | |
1106 | BUG_ON(ret); | |
1107 | ||
f254e52c | 1108 | ret = dirty_and_release_pages(NULL, root, file, pages, |
75dfe396 CM |
1109 | num_pages, pos, write_bytes); |
1110 | BUG_ON(ret); | |
1111 | btrfs_drop_pages(pages, num_pages); | |
1112 | ||
75dfe396 CM |
1113 | buf += write_bytes; |
1114 | count -= write_bytes; | |
1115 | pos += write_bytes; | |
1116 | num_written += write_bytes; | |
1117 | ||
1118 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1119 | cond_resched(); | |
1120 | } | |
1121 | mutex_unlock(&inode->i_mutex); | |
1122 | out: | |
1123 | *ppos = pos; | |
1124 | current->backing_dev_info = NULL; | |
1125 | return num_written ? num_written : err; | |
1126 | } | |
1127 | ||
f254e52c CM |
1128 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1129 | unsigned long offset, unsigned long size) | |
1130 | { | |
1131 | char *kaddr; | |
1132 | unsigned long left, count = desc->count; | |
1133 | ||
1134 | if (size > count) | |
1135 | size = count; | |
1136 | ||
1137 | if (!PageChecked(page)) { | |
1138 | /* FIXME, do it per block */ | |
1139 | struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb); | |
1140 | int ret = btrfs_csum_verify_file_block(root, | |
1141 | page->mapping->host->i_ino, | |
1142 | page->index << PAGE_CACHE_SHIFT, | |
1143 | kmap(page), PAGE_CACHE_SIZE); | |
1144 | if (ret) { | |
1145 | printk("failed to verify ino %lu page %lu\n", | |
1146 | page->mapping->host->i_ino, | |
1147 | page->index); | |
1148 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
1149 | } | |
1150 | SetPageChecked(page); | |
1151 | kunmap(page); | |
1152 | } | |
1153 | /* | |
1154 | * Faults on the destination of a read are common, so do it before | |
1155 | * taking the kmap. | |
1156 | */ | |
1157 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
1158 | kaddr = kmap_atomic(page, KM_USER0); | |
1159 | left = __copy_to_user_inatomic(desc->arg.buf, | |
1160 | kaddr + offset, size); | |
1161 | kunmap_atomic(kaddr, KM_USER0); | |
1162 | if (left == 0) | |
1163 | goto success; | |
1164 | } | |
1165 | ||
1166 | /* Do it the slow way */ | |
1167 | kaddr = kmap(page); | |
1168 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
1169 | kunmap(page); | |
1170 | ||
1171 | if (left) { | |
1172 | size -= left; | |
1173 | desc->error = -EFAULT; | |
1174 | } | |
1175 | success: | |
1176 | desc->count = count - size; | |
1177 | desc->written += size; | |
1178 | desc->arg.buf += size; | |
1179 | return size; | |
1180 | } | |
1181 | ||
1182 | /** | |
1183 | * btrfs_file_aio_read - filesystem read routine | |
1184 | * @iocb: kernel I/O control block | |
1185 | * @iov: io vector request | |
1186 | * @nr_segs: number of segments in the iovec | |
1187 | * @pos: current file position | |
1188 | */ | |
1189 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
1190 | unsigned long nr_segs, loff_t pos) | |
1191 | { | |
1192 | struct file *filp = iocb->ki_filp; | |
1193 | ssize_t retval; | |
1194 | unsigned long seg; | |
1195 | size_t count; | |
1196 | loff_t *ppos = &iocb->ki_pos; | |
1197 | ||
1198 | count = 0; | |
1199 | for (seg = 0; seg < nr_segs; seg++) { | |
1200 | const struct iovec *iv = &iov[seg]; | |
1201 | ||
1202 | /* | |
1203 | * If any segment has a negative length, or the cumulative | |
1204 | * length ever wraps negative then return -EINVAL. | |
1205 | */ | |
1206 | count += iv->iov_len; | |
1207 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
1208 | return -EINVAL; | |
1209 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
1210 | continue; | |
1211 | if (seg == 0) | |
1212 | return -EFAULT; | |
1213 | nr_segs = seg; | |
1214 | count -= iv->iov_len; /* This segment is no good */ | |
1215 | break; | |
1216 | } | |
1217 | retval = 0; | |
1218 | if (count) { | |
1219 | for (seg = 0; seg < nr_segs; seg++) { | |
1220 | read_descriptor_t desc; | |
1221 | ||
1222 | desc.written = 0; | |
1223 | desc.arg.buf = iov[seg].iov_base; | |
1224 | desc.count = iov[seg].iov_len; | |
1225 | if (desc.count == 0) | |
1226 | continue; | |
1227 | desc.error = 0; | |
1228 | do_generic_file_read(filp, ppos, &desc, | |
1229 | btrfs_read_actor); | |
1230 | retval += desc.written; | |
1231 | if (desc.error) { | |
1232 | retval = retval ?: desc.error; | |
1233 | break; | |
1234 | } | |
1235 | } | |
1236 | } | |
1237 | return retval; | |
1238 | } | |
1239 | ||
2e635a27 CM |
1240 | static int btrfs_get_sb(struct file_system_type *fs_type, |
1241 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1242 | { | |
1243 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
1244 | btrfs_fill_super, mnt); | |
1245 | } | |
1246 | ||
1247 | static struct file_system_type btrfs_fs_type = { | |
1248 | .owner = THIS_MODULE, | |
1249 | .name = "btrfs", | |
1250 | .get_sb = btrfs_get_sb, | |
1251 | .kill_sb = kill_block_super, | |
1252 | .fs_flags = FS_REQUIRES_DEV, | |
1253 | }; | |
1254 | ||
e20d96d6 CM |
1255 | static struct super_operations btrfs_super_ops = { |
1256 | .statfs = simple_statfs, | |
134e9731 | 1257 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
1258 | .put_super = btrfs_put_super, |
1259 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
1260 | .write_super = btrfs_write_super, |
1261 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 1262 | .write_inode = btrfs_write_inode, |
e20d96d6 CM |
1263 | }; |
1264 | ||
1265 | static struct inode_operations btrfs_dir_inode_operations = { | |
1266 | .lookup = btrfs_lookup, | |
d5719762 | 1267 | .create = btrfs_create, |
134e9731 | 1268 | .unlink = btrfs_unlink, |
f7922033 | 1269 | .mkdir = btrfs_mkdir, |
5f443fd2 | 1270 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
1271 | }; |
1272 | ||
1273 | static struct file_operations btrfs_dir_file_operations = { | |
1274 | .llseek = generic_file_llseek, | |
1275 | .read = generic_read_dir, | |
1276 | .readdir = btrfs_readdir, | |
1277 | }; | |
1278 | ||
dee26a9f CM |
1279 | static struct address_space_operations btrfs_aops = { |
1280 | .readpage = btrfs_readpage, | |
1281 | .readpages = btrfs_readpages, | |
1282 | .writepage = btrfs_writepage, | |
1283 | .sync_page = block_sync_page, | |
1284 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 1285 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
1286 | }; |
1287 | ||
1288 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 1289 | .truncate = btrfs_truncate, |
dee26a9f CM |
1290 | }; |
1291 | ||
1292 | static struct file_operations btrfs_file_operations = { | |
1293 | .llseek = generic_file_llseek, | |
1294 | .read = do_sync_read, | |
f254e52c | 1295 | .aio_read = btrfs_file_aio_read, |
75dfe396 | 1296 | .write = btrfs_file_write, |
dee26a9f CM |
1297 | .mmap = generic_file_mmap, |
1298 | .open = generic_file_open, | |
dee26a9f | 1299 | }; |
e20d96d6 | 1300 | |
2e635a27 CM |
1301 | static int __init init_btrfs_fs(void) |
1302 | { | |
1303 | printk("btrfs loaded!\n"); | |
1304 | return register_filesystem(&btrfs_fs_type); | |
1305 | } | |
1306 | ||
1307 | static void __exit exit_btrfs_fs(void) | |
1308 | { | |
1309 | unregister_filesystem(&btrfs_fs_type); | |
1310 | printk("btrfs unloaded\n"); | |
1311 | } | |
1312 | ||
1313 | module_init(init_btrfs_fs) | |
1314 | module_exit(exit_btrfs_fs) | |
1315 | ||
1316 | MODULE_LICENSE("GPL"); |