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; | |
252 | struct btrfs_file_extent_item *fi; | |
253 | u64 extent_start; | |
254 | u64 extent_num_blocks; | |
255 | ||
256 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
257 | key.objectid = inode->i_ino; | |
258 | key.offset = (u64)-1; | |
259 | key.flags = 0; | |
260 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
261 | while(1) { | |
262 | btrfs_init_path(&path); | |
263 | ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); | |
264 | if (ret < 0) { | |
265 | btrfs_release_path(root, &path); | |
266 | goto error; | |
267 | } | |
268 | if (ret > 0) { | |
269 | BUG_ON(path.slots[0] == 0); | |
270 | path.slots[0]--; | |
271 | } | |
272 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
273 | found_key = &leaf->items[path.slots[0]].key; | |
274 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) | |
275 | break; | |
276 | if (btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) | |
277 | break; | |
f4b9aa8d CM |
278 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
279 | break; | |
280 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
281 | path.slots[0], | |
282 | struct btrfs_file_extent_item); | |
283 | extent_start = btrfs_file_extent_disk_blocknr(fi); | |
284 | extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi); | |
285 | key.offset = btrfs_disk_key_offset(found_key) - 1; | |
286 | ret = btrfs_del_item(trans, root, &path); | |
287 | BUG_ON(ret); | |
288 | inode->i_blocks -= btrfs_file_extent_num_blocks(fi) >> 9; | |
289 | btrfs_release_path(root, &path); | |
290 | ret = btrfs_free_extent(trans, root, extent_start, | |
291 | extent_num_blocks, 0); | |
292 | BUG_ON(ret); | |
5f443fd2 | 293 | if (key.offset + 1 == 0) |
f4b9aa8d CM |
294 | break; |
295 | } | |
296 | btrfs_release_path(root, &path); | |
297 | ret = 0; | |
298 | error: | |
299 | return ret; | |
300 | } | |
301 | ||
134e9731 CM |
302 | static void btrfs_delete_inode(struct inode *inode) |
303 | { | |
304 | struct btrfs_trans_handle *trans; | |
305 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
f4b9aa8d CM |
306 | int ret; |
307 | ||
134e9731 CM |
308 | truncate_inode_pages(&inode->i_data, 0); |
309 | if (is_bad_inode(inode)) { | |
310 | goto no_delete; | |
311 | } | |
312 | inode->i_size = 0; | |
134e9731 CM |
313 | mutex_lock(&root->fs_info->fs_mutex); |
314 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
315 | if (S_ISREG(inode->i_mode)) { |
316 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
317 | BUG_ON(ret); | |
318 | } | |
134e9731 CM |
319 | btrfs_free_inode(trans, root, inode); |
320 | btrfs_end_transaction(trans, root); | |
321 | mutex_unlock(&root->fs_info->fs_mutex); | |
322 | return; | |
323 | no_delete: | |
324 | clear_inode(inode); | |
325 | } | |
326 | ||
e20d96d6 CM |
327 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
328 | ino_t *ino) | |
329 | { | |
330 | const char *name = dentry->d_name.name; | |
331 | int namelen = dentry->d_name.len; | |
332 | struct btrfs_dir_item *di; | |
333 | struct btrfs_path path; | |
334 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
335 | int ret; | |
336 | ||
337 | btrfs_init_path(&path); | |
338 | ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name, | |
339 | namelen, 0); | |
7f5c1516 | 340 | if (ret || !btrfs_match_dir_item_name(root, &path, name, namelen)) { |
e20d96d6 CM |
341 | *ino = 0; |
342 | goto out; | |
343 | } | |
344 | di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
345 | struct btrfs_dir_item); | |
346 | *ino = btrfs_dir_objectid(di); | |
347 | out: | |
348 | btrfs_release_path(root, &path); | |
349 | return ret; | |
350 | } | |
351 | ||
352 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
353 | struct nameidata *nd) | |
354 | { | |
355 | struct inode * inode; | |
356 | ino_t ino; | |
357 | int ret; | |
358 | ||
359 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
360 | return ERR_PTR(-ENAMETOOLONG); | |
361 | ||
362 | ret = btrfs_inode_by_name(dir, dentry, &ino); | |
363 | if (ret < 0) | |
364 | return ERR_PTR(ret); | |
365 | inode = NULL; | |
366 | if (ino) { | |
e20d96d6 CM |
367 | inode = iget(dir->i_sb, ino); |
368 | if (!inode) | |
369 | return ERR_PTR(-EACCES); | |
370 | } | |
371 | return d_splice_alias(inode, dentry); | |
372 | } | |
373 | ||
374 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
375 | { | |
376 | struct inode *inode = filp->f_path.dentry->d_inode; | |
377 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
378 | struct btrfs_item *item; | |
379 | struct btrfs_dir_item *di; | |
380 | struct btrfs_key key; | |
381 | struct btrfs_path path; | |
382 | int ret; | |
383 | u32 nritems; | |
384 | struct btrfs_leaf *leaf; | |
385 | int slot; | |
386 | int advance; | |
387 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 388 | int over = 0; |
e20d96d6 CM |
389 | |
390 | key.objectid = inode->i_ino; | |
e20d96d6 CM |
391 | key.flags = 0; |
392 | btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY); | |
393 | key.offset = filp->f_pos; | |
394 | btrfs_init_path(&path); | |
395 | ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0); | |
396 | if (ret < 0) { | |
397 | goto err; | |
398 | } | |
7f5c1516 | 399 | advance = 0; |
e20d96d6 CM |
400 | while(1) { |
401 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
402 | nritems = btrfs_header_nritems(&leaf->header); | |
403 | slot = path.slots[0]; | |
dee26a9f CM |
404 | if (advance || slot >= nritems) { |
405 | if (slot >= nritems -1) { | |
e20d96d6 CM |
406 | ret = btrfs_next_leaf(root, &path); |
407 | if (ret) | |
408 | break; | |
409 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
410 | nritems = btrfs_header_nritems(&leaf->header); | |
411 | slot = path.slots[0]; | |
e20d96d6 CM |
412 | } else { |
413 | slot++; | |
414 | path.slots[0]++; | |
415 | } | |
416 | } | |
417 | advance = 1; | |
418 | item = leaf->items + slot; | |
e20d96d6 CM |
419 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
420 | break; | |
421 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY) | |
422 | continue; | |
7f5c1516 CM |
423 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
424 | continue; | |
dee26a9f CM |
425 | |
426 | advance = 1; | |
e20d96d6 | 427 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
428 | over = filldir(dirent, (const char *)(di + 1), |
429 | btrfs_dir_name_len(di), | |
430 | btrfs_disk_key_offset(&item->key), | |
431 | btrfs_dir_objectid(di), d_type); | |
7f5c1516 CM |
432 | if (over) { |
433 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
e20d96d6 | 434 | break; |
7f5c1516 | 435 | } |
e20d96d6 CM |
436 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
437 | } | |
e20d96d6 CM |
438 | ret = 0; |
439 | err: | |
440 | btrfs_release_path(root, &path); | |
441 | return ret; | |
442 | } | |
443 | ||
444 | static void btrfs_put_super (struct super_block * sb) | |
445 | { | |
446 | struct btrfs_root *root = btrfs_sb(sb); | |
447 | int ret; | |
448 | ||
449 | ret = close_ctree(root); | |
450 | if (ret) { | |
451 | printk("close ctree returns %d\n", ret); | |
452 | } | |
453 | sb->s_fs_info = NULL; | |
454 | } | |
2e635a27 CM |
455 | |
456 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
457 | { | |
458 | struct inode * inode; | |
e20d96d6 CM |
459 | struct dentry * root_dentry; |
460 | struct btrfs_super_block *disk_super; | |
461 | struct buffer_head *bh; | |
462 | struct btrfs_root *root; | |
2e635a27 CM |
463 | |
464 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
465 | sb->s_blocksize = PAGE_CACHE_SIZE; | |
466 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
467 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
e20d96d6 | 468 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 469 | sb->s_time_gran = 1; |
e20d96d6 CM |
470 | |
471 | bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize); | |
472 | if (!bh) { | |
473 | printk("btrfs: unable to read on disk super\n"); | |
474 | return -EIO; | |
475 | } | |
476 | disk_super = (struct btrfs_super_block *)bh->b_data; | |
477 | root = open_ctree(sb, bh, disk_super); | |
d98237b3 | 478 | |
e20d96d6 CM |
479 | if (!root) { |
480 | printk("btrfs: open_ctree failed\n"); | |
481 | return -EIO; | |
482 | } | |
87cbda5c CM |
483 | sb->s_fs_info = root; |
484 | disk_super = root->fs_info->disk_super; | |
e20d96d6 CM |
485 | printk("read in super total blocks %Lu root %Lu\n", |
486 | btrfs_super_total_blocks(disk_super), | |
487 | btrfs_super_root_dir(disk_super)); | |
488 | ||
489 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
2e635a27 CM |
490 | if (!inode) |
491 | return -ENOMEM; | |
e20d96d6 CM |
492 | if (inode->i_state & I_NEW) { |
493 | btrfs_read_locked_inode(inode); | |
494 | unlock_new_inode(inode); | |
495 | } | |
2e635a27 | 496 | |
e20d96d6 CM |
497 | root_dentry = d_alloc_root(inode); |
498 | if (!root_dentry) { | |
2e635a27 CM |
499 | iput(inode); |
500 | return -ENOMEM; | |
501 | } | |
e20d96d6 CM |
502 | sb->s_root = root_dentry; |
503 | ||
2e635a27 CM |
504 | return 0; |
505 | } | |
506 | ||
d5719762 CM |
507 | static void fill_inode_item(struct btrfs_inode_item *item, |
508 | struct inode *inode) | |
509 | { | |
510 | btrfs_set_inode_uid(item, inode->i_uid); | |
511 | btrfs_set_inode_gid(item, inode->i_gid); | |
512 | btrfs_set_inode_size(item, inode->i_size); | |
513 | btrfs_set_inode_mode(item, inode->i_mode); | |
514 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
515 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
516 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
517 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
518 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
519 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
520 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
521 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
522 | btrfs_set_inode_generation(item, inode->i_generation); | |
523 | } | |
524 | ||
4730a4bc CM |
525 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
526 | struct btrfs_root *root, | |
527 | struct inode *inode) | |
528 | { | |
529 | struct btrfs_inode_item *inode_item; | |
530 | struct btrfs_path path; | |
531 | int ret; | |
532 | ||
533 | btrfs_init_path(&path); | |
534 | ||
535 | ret = btrfs_lookup_inode(trans, root, &path, inode->i_ino, 1); | |
536 | if (ret) { | |
537 | if (ret > 0) | |
538 | ret = -ENOENT; | |
539 | goto failed; | |
540 | } | |
541 | ||
542 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), | |
543 | path.slots[0], | |
544 | struct btrfs_inode_item); | |
545 | ||
546 | fill_inode_item(inode_item, inode); | |
547 | mark_buffer_dirty(path.nodes[0]); | |
548 | failed: | |
549 | btrfs_release_path(root, &path); | |
550 | return 0; | |
551 | } | |
552 | ||
553 | static int btrfs_write_inode(struct inode *inode, int wait) | |
554 | { | |
555 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
556 | struct btrfs_trans_handle *trans; | |
557 | int ret; | |
558 | ||
559 | mutex_lock(&root->fs_info->fs_mutex); | |
560 | trans = btrfs_start_transaction(root, 1); | |
561 | ret = btrfs_update_inode(trans, root, inode); | |
562 | if (wait) | |
563 | btrfs_commit_transaction(trans, root); | |
564 | else | |
565 | btrfs_end_transaction(trans, root); | |
566 | mutex_unlock(&root->fs_info->fs_mutex); | |
567 | return ret; | |
568 | } | |
569 | ||
d5719762 CM |
570 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
571 | struct inode *dir, int mode) | |
572 | { | |
573 | struct inode *inode; | |
574 | struct btrfs_inode_item inode_item; | |
575 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
576 | struct btrfs_key key; | |
577 | int ret; | |
578 | u64 objectid; | |
579 | ||
580 | inode = new_inode(dir->i_sb); | |
581 | if (!inode) | |
582 | return ERR_PTR(-ENOMEM); | |
583 | ||
584 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
585 | BUG_ON(ret); | |
586 | ||
587 | inode->i_uid = current->fsuid; | |
588 | inode->i_gid = current->fsgid; | |
589 | inode->i_mode = mode; | |
590 | inode->i_ino = objectid; | |
591 | inode->i_blocks = 0; | |
592 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
593 | fill_inode_item(&inode_item, inode); | |
594 | ||
d5719762 CM |
595 | key.objectid = objectid; |
596 | key.flags = 0; | |
597 | key.offset = 0; | |
598 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
599 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
600 | BUG_ON(ret); | |
601 | ||
602 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
603 | BUG_ON(ret); | |
604 | ||
605 | insert_inode_hash(inode); | |
d5719762 CM |
606 | return inode; |
607 | } | |
608 | ||
609 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
610 | struct dentry *dentry, struct inode *inode) | |
611 | { | |
612 | int ret; | |
613 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
614 | dentry->d_name.name, dentry->d_name.len, | |
615 | dentry->d_parent->d_inode->i_ino, | |
616 | inode->i_ino, 0); | |
4730a4bc CM |
617 | if (ret == 0) { |
618 | dentry->d_parent->d_inode->i_size += dentry->d_name.len; | |
619 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), | |
620 | dentry->d_parent->d_inode); | |
621 | } | |
622 | ||
d5719762 CM |
623 | return ret; |
624 | } | |
625 | ||
626 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
627 | struct dentry *dentry, struct inode *inode) | |
628 | { | |
629 | int err = btrfs_add_link(trans, dentry, inode); | |
630 | if (!err) { | |
631 | d_instantiate(dentry, inode); | |
632 | return 0; | |
633 | } | |
d5719762 CM |
634 | return err; |
635 | } | |
636 | ||
637 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
638 | int mode, struct nameidata *nd) | |
639 | { | |
640 | struct btrfs_trans_handle *trans; | |
641 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
642 | struct inode *inode; | |
643 | int err; | |
134e9731 | 644 | int drop_inode = 0; |
d5719762 | 645 | |
d561c025 | 646 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
647 | trans = btrfs_start_transaction(root, 1); |
648 | inode = btrfs_new_inode(trans, dir, mode); | |
649 | err = PTR_ERR(inode); | |
650 | if (IS_ERR(inode)) | |
d561c025 | 651 | goto out_unlock; |
d5719762 CM |
652 | // FIXME mark the inode dirty |
653 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
654 | if (err) |
655 | drop_inode = 1; | |
dee26a9f CM |
656 | else { |
657 | inode->i_mapping->a_ops = &btrfs_aops; | |
658 | inode->i_fop = &btrfs_file_operations; | |
659 | inode->i_op = &btrfs_file_inode_operations; | |
660 | } | |
d5719762 CM |
661 | dir->i_sb->s_dirt = 1; |
662 | btrfs_end_transaction(trans, root); | |
d561c025 CM |
663 | out_unlock: |
664 | mutex_unlock(&root->fs_info->fs_mutex); | |
134e9731 CM |
665 | if (drop_inode) { |
666 | inode_dec_link_count(inode); | |
667 | iput(inode); | |
668 | } | |
d5719762 CM |
669 | return err; |
670 | } | |
671 | ||
f7922033 CM |
672 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
673 | struct inode *inode, struct inode *dir) | |
674 | { | |
675 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
676 | int ret; | |
677 | char buf[2]; | |
678 | buf[0] = '.'; | |
679 | buf[1] = '.'; | |
680 | ||
681 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, | |
682 | inode->i_ino, 1); | |
683 | if (ret) | |
684 | goto error; | |
685 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, | |
686 | dir->i_ino, 1); | |
4730a4bc CM |
687 | if (ret) |
688 | goto error; | |
689 | inode->i_size = 3; | |
690 | ret = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
691 | error: |
692 | return ret; | |
693 | } | |
694 | ||
695 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
696 | { | |
697 | struct inode *inode; | |
698 | struct btrfs_trans_handle *trans; | |
699 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
700 | int err = 0; | |
701 | int drop_on_err = 0; | |
702 | ||
703 | mutex_lock(&root->fs_info->fs_mutex); | |
704 | trans = btrfs_start_transaction(root, 1); | |
705 | if (IS_ERR(trans)) { | |
706 | err = PTR_ERR(trans); | |
707 | goto out_unlock; | |
708 | } | |
709 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); | |
710 | if (IS_ERR(inode)) { | |
711 | err = PTR_ERR(inode); | |
712 | goto out_fail; | |
713 | } | |
714 | drop_on_err = 1; | |
715 | inode->i_op = &btrfs_dir_inode_operations; | |
716 | inode->i_fop = &btrfs_dir_file_operations; | |
717 | ||
718 | err = btrfs_make_empty_dir(trans, inode, dir); | |
719 | if (err) | |
720 | goto out_fail; | |
721 | err = btrfs_add_link(trans, dentry, inode); | |
722 | if (err) | |
723 | goto out_fail; | |
724 | d_instantiate(dentry, inode); | |
f7922033 CM |
725 | drop_on_err = 0; |
726 | ||
727 | out_fail: | |
728 | btrfs_end_transaction(trans, root); | |
729 | out_unlock: | |
730 | mutex_unlock(&root->fs_info->fs_mutex); | |
731 | if (drop_on_err) | |
732 | iput(inode); | |
733 | return err; | |
734 | } | |
735 | ||
d5719762 CM |
736 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
737 | { | |
738 | struct btrfs_trans_handle *trans; | |
739 | struct btrfs_root *root; | |
740 | int ret; | |
d98237b3 | 741 | root = btrfs_sb(sb); |
df2ce34c | 742 | |
d5719762 | 743 | sb->s_dirt = 0; |
d561c025 | 744 | if (!wait) { |
d98237b3 | 745 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
746 | return 0; |
747 | } | |
d98237b3 | 748 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
df2ce34c | 749 | |
d561c025 | 750 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
751 | trans = btrfs_start_transaction(root, 1); |
752 | ret = btrfs_commit_transaction(trans, root); | |
753 | sb->s_dirt = 0; | |
754 | BUG_ON(ret); | |
755 | printk("btrfs sync_fs\n"); | |
d561c025 | 756 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
757 | return 0; |
758 | } | |
759 | ||
75dfe396 | 760 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
761 | struct buffer_head *result, int create) |
762 | { | |
763 | int ret; | |
764 | int err = 0; | |
765 | u64 blocknr; | |
766 | u64 extent_start = 0; | |
767 | u64 extent_end = 0; | |
768 | u64 objectid = inode->i_ino; | |
769 | struct btrfs_path path; | |
770 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
771 | struct btrfs_trans_handle *trans = NULL; | |
772 | struct btrfs_file_extent_item *item; | |
773 | struct btrfs_leaf *leaf; | |
774 | struct btrfs_disk_key *found_key; | |
775 | ||
776 | btrfs_init_path(&path); | |
dee26a9f CM |
777 | if (create) |
778 | trans = btrfs_start_transaction(root, 1); | |
779 | ||
780 | ||
781 | ret = btrfs_lookup_file_extent(trans, root, &path, | |
9773a788 CM |
782 | inode->i_ino, |
783 | iblock << inode->i_blkbits, 0); | |
dee26a9f CM |
784 | if (ret < 0) { |
785 | btrfs_release_path(root, &path); | |
786 | err = ret; | |
787 | goto out; | |
788 | } | |
789 | ||
790 | if (ret != 0) { | |
791 | if (path.slots[0] == 0) { | |
792 | btrfs_release_path(root, &path); | |
793 | goto allocate; | |
794 | } | |
795 | path.slots[0]--; | |
796 | } | |
797 | ||
798 | item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0], | |
799 | struct btrfs_file_extent_item); | |
800 | leaf = btrfs_buffer_leaf(path.nodes[0]); | |
801 | blocknr = btrfs_file_extent_disk_blocknr(item); | |
802 | blocknr += btrfs_file_extent_offset(item); | |
803 | ||
804 | /* exact match found, use it */ | |
805 | if (ret == 0) { | |
806 | err = 0; | |
807 | map_bh(result, inode->i_sb, blocknr); | |
808 | btrfs_release_path(root, &path); | |
809 | goto out; | |
810 | } | |
811 | ||
812 | /* are we inside the extent that was found? */ | |
813 | found_key = &leaf->items[path.slots[0]].key; | |
814 | if (btrfs_disk_key_objectid(found_key) != objectid || | |
815 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { | |
816 | extent_end = 0; | |
817 | extent_start = 0; | |
818 | btrfs_release_path(root, &path); | |
819 | goto allocate; | |
820 | } | |
821 | ||
822 | extent_start = btrfs_disk_key_offset(&leaf->items[path.slots[0]].key); | |
9773a788 | 823 | extent_start = extent_start >> inode->i_blkbits; |
dee26a9f CM |
824 | extent_start += btrfs_file_extent_offset(item); |
825 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
826 | btrfs_release_path(root, &path); | |
827 | if (iblock >= extent_start && iblock < extent_end) { | |
828 | err = 0; | |
829 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); | |
830 | goto out; | |
831 | } | |
832 | allocate: | |
833 | /* ok, create a new extent */ | |
834 | if (!create) { | |
835 | err = 0; | |
836 | goto out; | |
837 | } | |
9773a788 CM |
838 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
839 | iblock << inode->i_blkbits, | |
dee26a9f CM |
840 | 1, extent_end, &blocknr); |
841 | if (ret) { | |
842 | err = ret; | |
843 | goto out; | |
844 | } | |
f4b9aa8d CM |
845 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
846 | set_buffer_new(result); | |
dee26a9f CM |
847 | map_bh(result, inode->i_sb, blocknr); |
848 | ||
849 | out: | |
850 | if (trans) | |
851 | btrfs_end_transaction(trans, root); | |
75dfe396 CM |
852 | return err; |
853 | } | |
854 | ||
855 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
856 | struct buffer_head *result, int create) | |
857 | { | |
858 | int err; | |
859 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
860 | mutex_lock(&root->fs_info->fs_mutex); | |
861 | err = btrfs_get_block_lock(inode, iblock, result, create); | |
dee26a9f CM |
862 | mutex_unlock(&root->fs_info->fs_mutex); |
863 | return err; | |
864 | } | |
865 | ||
866 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
867 | unsigned from, unsigned to) | |
868 | { | |
75dfe396 | 869 | WARN_ON(1); |
6407bf6d | 870 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f | 871 | } |
75dfe396 CM |
872 | static int btrfs_commit_write(struct file *file, struct page *page, |
873 | unsigned from, unsigned to) | |
874 | { | |
875 | WARN_ON(1); | |
876 | return nobh_commit_write(file, page, from, to); | |
877 | } | |
dee26a9f | 878 | |
d561c025 CM |
879 | static void btrfs_write_super(struct super_block *sb) |
880 | { | |
881 | btrfs_sync_fs(sb, 1); | |
882 | } | |
883 | ||
dee26a9f CM |
884 | static int btrfs_readpage(struct file *file, struct page *page) |
885 | { | |
886 | return mpage_readpage(page, btrfs_get_block); | |
887 | } | |
888 | ||
889 | static int btrfs_readpages(struct file *file, struct address_space *mapping, | |
890 | struct list_head *pages, unsigned nr_pages) | |
891 | { | |
892 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); | |
893 | } | |
894 | ||
895 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | |
896 | { | |
6407bf6d | 897 | return nobh_writepage(page, btrfs_get_block, wbc); |
dee26a9f | 898 | } |
d561c025 | 899 | |
f4b9aa8d CM |
900 | static void btrfs_truncate(struct inode *inode) |
901 | { | |
902 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
903 | int ret; | |
904 | struct btrfs_trans_handle *trans; | |
905 | ||
906 | if (!S_ISREG(inode->i_mode)) | |
907 | return; | |
908 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
909 | return; | |
910 | ||
911 | nobh_truncate_page(inode->i_mapping, inode->i_size); | |
912 | ||
913 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
914 | mutex_lock(&root->fs_info->fs_mutex); | |
915 | trans = btrfs_start_transaction(root, 1); | |
916 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
917 | BUG_ON(ret); | |
918 | ret = btrfs_end_transaction(trans, root); | |
919 | BUG_ON(ret); | |
920 | mutex_unlock(&root->fs_info->fs_mutex); | |
921 | mark_inode_dirty(inode); | |
922 | } | |
923 | ||
75dfe396 CM |
924 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
925 | struct page **prepared_pages, | |
926 | const char __user * buf) | |
927 | { | |
928 | long page_fault = 0; | |
929 | int i; | |
930 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
931 | ||
932 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
933 | size_t count = min_t(size_t, | |
934 | PAGE_CACHE_SIZE - offset, write_bytes); | |
935 | struct page *page = prepared_pages[i]; | |
936 | fault_in_pages_readable(buf, count); | |
937 | ||
938 | /* Copy data from userspace to the current page */ | |
939 | kmap(page); | |
940 | page_fault = __copy_from_user(page_address(page) + offset, | |
941 | buf, count); | |
942 | /* Flush processor's dcache for this page */ | |
943 | flush_dcache_page(page); | |
944 | kunmap(page); | |
945 | buf += count; | |
946 | write_bytes -= count; | |
947 | ||
948 | if (page_fault) | |
949 | break; | |
950 | } | |
951 | return page_fault ? -EFAULT : 0; | |
952 | } | |
953 | ||
954 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
955 | { | |
956 | size_t i; | |
957 | for (i = 0; i < num_pages; i++) { | |
958 | if (!pages[i]) | |
959 | break; | |
960 | unlock_page(pages[i]); | |
961 | mark_page_accessed(pages[i]); | |
962 | page_cache_release(pages[i]); | |
963 | } | |
964 | } | |
965 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
966 | struct btrfs_root *root, | |
967 | struct file *file, | |
968 | struct page **pages, | |
969 | size_t num_pages, | |
970 | loff_t pos, | |
971 | size_t write_bytes) | |
972 | { | |
973 | int i; | |
974 | int offset; | |
975 | int err = 0; | |
976 | int ret; | |
977 | int this_write; | |
978 | ||
979 | for (i = 0; i < num_pages; i++) { | |
980 | offset = pos & (PAGE_CACHE_SIZE -1); | |
981 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
982 | ret = nobh_commit_write(file, pages[i], offset, | |
983 | offset + this_write); | |
984 | pos += this_write; | |
985 | if (ret) { | |
986 | err = ret; | |
987 | goto failed; | |
988 | } | |
989 | WARN_ON(this_write > write_bytes); | |
990 | write_bytes -= this_write; | |
991 | } | |
992 | failed: | |
993 | return err; | |
994 | } | |
995 | ||
996 | static int prepare_pages(struct btrfs_trans_handle *trans, | |
997 | struct btrfs_root *root, | |
998 | struct file *file, | |
999 | struct page **pages, | |
1000 | size_t num_pages, | |
1001 | loff_t pos, | |
1002 | size_t write_bytes) | |
1003 | { | |
1004 | int i; | |
1005 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1006 | struct inode *inode = file->f_path.dentry->d_inode; | |
1007 | int offset; | |
1008 | int err = 0; | |
1009 | int ret; | |
1010 | int this_write; | |
1011 | loff_t isize = i_size_read(inode); | |
1012 | ||
1013 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1014 | ||
1015 | for (i = 0; i < num_pages; i++) { | |
1016 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1017 | if (!pages[i]) { | |
1018 | err = -ENOMEM; | |
1019 | goto failed_release; | |
1020 | } | |
1021 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1022 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
1023 | ret = nobh_prepare_write(pages[i], offset, | |
1024 | offset + this_write, | |
1025 | btrfs_get_block_lock); | |
1026 | pos += this_write; | |
1027 | if (ret) { | |
1028 | err = ret; | |
1029 | goto failed_truncate; | |
1030 | } | |
1031 | WARN_ON(this_write > write_bytes); | |
1032 | write_bytes -= this_write; | |
1033 | } | |
1034 | return 0; | |
1035 | ||
1036 | failed_release: | |
1037 | btrfs_drop_pages(pages, num_pages); | |
1038 | return err; | |
1039 | ||
1040 | failed_truncate: | |
1041 | btrfs_drop_pages(pages, num_pages); | |
1042 | if (pos > isize) | |
1043 | vmtruncate(inode, isize); | |
1044 | return err; | |
1045 | } | |
1046 | ||
1047 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1048 | size_t count, loff_t *ppos) | |
1049 | { | |
1050 | loff_t pos; | |
1051 | size_t num_written = 0; | |
1052 | int err = 0; | |
1053 | int ret = 0; | |
1054 | struct btrfs_trans_handle *trans; | |
1055 | struct inode *inode = file->f_path.dentry->d_inode; | |
1056 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
1057 | struct page *pages[1]; | |
1058 | ||
1059 | if (file->f_flags & O_DIRECT) | |
1060 | return -EINVAL; | |
1061 | pos = *ppos; | |
1062 | ||
1063 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1064 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1065 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1066 | if (err) | |
1067 | goto out; | |
1068 | if (count == 0) | |
1069 | goto out; | |
1070 | err = remove_suid(file->f_path.dentry); | |
1071 | if (err) | |
1072 | goto out; | |
1073 | file_update_time(file); | |
1074 | mutex_lock(&inode->i_mutex); | |
1075 | while(count > 0) { | |
1076 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1077 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1078 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1079 | PAGE_CACHE_SHIFT; | |
1080 | mutex_lock(&root->fs_info->fs_mutex); | |
1081 | trans = btrfs_start_transaction(root, 1); | |
1082 | ||
1083 | ret = prepare_pages(trans, root, file, pages, num_pages, | |
1084 | pos, write_bytes); | |
1085 | BUG_ON(ret); | |
1086 | ret = btrfs_copy_from_user(pos, num_pages, | |
1087 | write_bytes, pages, buf); | |
1088 | BUG_ON(ret); | |
1089 | ||
1090 | mutex_unlock(&root->fs_info->fs_mutex); | |
1091 | ||
1092 | ret = dirty_and_release_pages(trans, root, file, pages, | |
1093 | num_pages, pos, write_bytes); | |
1094 | BUG_ON(ret); | |
1095 | btrfs_drop_pages(pages, num_pages); | |
1096 | ||
1097 | ret = btrfs_end_transaction(trans, root); | |
1098 | ||
1099 | buf += write_bytes; | |
1100 | count -= write_bytes; | |
1101 | pos += write_bytes; | |
1102 | num_written += write_bytes; | |
1103 | ||
1104 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1105 | cond_resched(); | |
1106 | } | |
1107 | mutex_unlock(&inode->i_mutex); | |
1108 | out: | |
1109 | *ppos = pos; | |
1110 | current->backing_dev_info = NULL; | |
1111 | return num_written ? num_written : err; | |
1112 | } | |
1113 | ||
2e635a27 CM |
1114 | static int btrfs_get_sb(struct file_system_type *fs_type, |
1115 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1116 | { | |
1117 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
1118 | btrfs_fill_super, mnt); | |
1119 | } | |
1120 | ||
1121 | static struct file_system_type btrfs_fs_type = { | |
1122 | .owner = THIS_MODULE, | |
1123 | .name = "btrfs", | |
1124 | .get_sb = btrfs_get_sb, | |
1125 | .kill_sb = kill_block_super, | |
1126 | .fs_flags = FS_REQUIRES_DEV, | |
1127 | }; | |
1128 | ||
e20d96d6 CM |
1129 | static struct super_operations btrfs_super_ops = { |
1130 | .statfs = simple_statfs, | |
134e9731 | 1131 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
1132 | .put_super = btrfs_put_super, |
1133 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
1134 | .write_super = btrfs_write_super, |
1135 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 1136 | .write_inode = btrfs_write_inode, |
e20d96d6 CM |
1137 | }; |
1138 | ||
1139 | static struct inode_operations btrfs_dir_inode_operations = { | |
1140 | .lookup = btrfs_lookup, | |
d5719762 | 1141 | .create = btrfs_create, |
134e9731 | 1142 | .unlink = btrfs_unlink, |
f7922033 | 1143 | .mkdir = btrfs_mkdir, |
5f443fd2 | 1144 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
1145 | }; |
1146 | ||
1147 | static struct file_operations btrfs_dir_file_operations = { | |
1148 | .llseek = generic_file_llseek, | |
1149 | .read = generic_read_dir, | |
1150 | .readdir = btrfs_readdir, | |
1151 | }; | |
1152 | ||
dee26a9f CM |
1153 | static struct address_space_operations btrfs_aops = { |
1154 | .readpage = btrfs_readpage, | |
1155 | .readpages = btrfs_readpages, | |
1156 | .writepage = btrfs_writepage, | |
1157 | .sync_page = block_sync_page, | |
1158 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 1159 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
1160 | }; |
1161 | ||
1162 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 1163 | .truncate = btrfs_truncate, |
dee26a9f CM |
1164 | }; |
1165 | ||
1166 | static struct file_operations btrfs_file_operations = { | |
1167 | .llseek = generic_file_llseek, | |
1168 | .read = do_sync_read, | |
75dfe396 CM |
1169 | .aio_read = generic_file_aio_read, |
1170 | .write = btrfs_file_write, | |
dee26a9f CM |
1171 | .mmap = generic_file_mmap, |
1172 | .open = generic_file_open, | |
dee26a9f | 1173 | }; |
e20d96d6 | 1174 | |
2e635a27 CM |
1175 | static int __init init_btrfs_fs(void) |
1176 | { | |
1177 | printk("btrfs loaded!\n"); | |
1178 | return register_filesystem(&btrfs_fs_type); | |
1179 | } | |
1180 | ||
1181 | static void __exit exit_btrfs_fs(void) | |
1182 | { | |
1183 | unregister_filesystem(&btrfs_fs_type); | |
1184 | printk("btrfs unloaded\n"); | |
1185 | } | |
1186 | ||
1187 | module_init(init_btrfs_fs) | |
1188 | module_exit(exit_btrfs_fs) | |
1189 | ||
1190 | MODULE_LICENSE("GPL"); |