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" |
2c90e5d6 | 17 | #include "btrfs_inode.h" |
2e635a27 CM |
18 | |
19 | #define BTRFS_SUPER_MAGIC 0x9123682E | |
e20d96d6 CM |
20 | |
21 | static struct inode_operations btrfs_dir_inode_operations; | |
22 | static struct super_operations btrfs_super_ops; | |
23 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
24 | static struct inode_operations btrfs_file_inode_operations; |
25 | static struct address_space_operations btrfs_aops; | |
26 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 27 | |
2c90e5d6 CM |
28 | static int check_inode(struct inode *inode) |
29 | { | |
30 | struct btrfs_inode *ei = BTRFS_I(inode); | |
31 | WARN_ON(ei->magic != 0xDEADBEEF); | |
32 | WARN_ON(ei->magic2 != 0xDEADBEAF); | |
33 | return 0; | |
34 | } | |
35 | ||
e20d96d6 | 36 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 37 | { |
5caf2a00 | 38 | struct btrfs_path *path; |
e20d96d6 CM |
39 | struct btrfs_inode_item *inode_item; |
40 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
41 | int ret; | |
f4b9aa8d | 42 | |
5caf2a00 CM |
43 | path = btrfs_alloc_path(); |
44 | BUG_ON(!path); | |
45 | btrfs_init_path(path); | |
f4b9aa8d CM |
46 | mutex_lock(&root->fs_info->fs_mutex); |
47 | ||
2c90e5d6 | 48 | check_inode(inode); |
5caf2a00 | 49 | ret = btrfs_lookup_inode(NULL, root, path, inode->i_ino, 0); |
e20d96d6 | 50 | if (ret) { |
5caf2a00 | 51 | btrfs_release_path(root, path); |
7cfcc17e | 52 | btrfs_free_path(path); |
f4b9aa8d CM |
53 | mutex_unlock(&root->fs_info->fs_mutex); |
54 | make_bad_inode(inode); | |
e20d96d6 CM |
55 | return; |
56 | } | |
2c90e5d6 | 57 | check_inode(inode); |
5caf2a00 CM |
58 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
59 | path->slots[0], | |
e20d96d6 | 60 | struct btrfs_inode_item); |
2e635a27 | 61 | |
e20d96d6 CM |
62 | inode->i_mode = btrfs_inode_mode(inode_item); |
63 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
64 | inode->i_uid = btrfs_inode_uid(inode_item); | |
65 | inode->i_gid = btrfs_inode_gid(inode_item); | |
66 | inode->i_size = btrfs_inode_size(inode_item); | |
67 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
68 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
69 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
70 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
71 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
72 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
73 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
74 | inode->i_generation = btrfs_inode_generation(inode_item); | |
5caf2a00 CM |
75 | |
76 | btrfs_release_path(root, path); | |
77 | btrfs_free_path(path); | |
78 | inode_item = NULL; | |
79 | ||
f4b9aa8d | 80 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 81 | check_inode(inode); |
e20d96d6 CM |
82 | switch (inode->i_mode & S_IFMT) { |
83 | #if 0 | |
84 | default: | |
85 | init_special_inode(inode, inode->i_mode, | |
86 | btrfs_inode_rdev(inode_item)); | |
87 | break; | |
88 | #endif | |
89 | case S_IFREG: | |
dee26a9f CM |
90 | inode->i_mapping->a_ops = &btrfs_aops; |
91 | inode->i_fop = &btrfs_file_operations; | |
92 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
93 | break; |
94 | case S_IFDIR: | |
e20d96d6 CM |
95 | inode->i_op = &btrfs_dir_inode_operations; |
96 | inode->i_fop = &btrfs_dir_file_operations; | |
97 | break; | |
98 | case S_IFLNK: | |
e20d96d6 CM |
99 | // inode->i_op = &page_symlink_inode_operations; |
100 | break; | |
2e635a27 | 101 | } |
2c90e5d6 | 102 | check_inode(inode); |
e20d96d6 | 103 | return; |
2e635a27 CM |
104 | } |
105 | ||
5f443fd2 CM |
106 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
107 | struct btrfs_root *root, | |
108 | struct inode *dir, | |
109 | struct dentry *dentry) | |
134e9731 | 110 | { |
5caf2a00 | 111 | struct btrfs_path *path; |
134e9731 CM |
112 | const char *name = dentry->d_name.name; |
113 | int name_len = dentry->d_name.len; | |
114 | int ret; | |
115 | u64 objectid; | |
116 | struct btrfs_dir_item *di; | |
117 | ||
5caf2a00 CM |
118 | path = btrfs_alloc_path(); |
119 | BUG_ON(!path); | |
120 | btrfs_init_path(path); | |
121 | ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, | |
134e9731 CM |
122 | name, name_len, -1); |
123 | if (ret < 0) | |
124 | goto err; | |
125 | if (ret > 0) { | |
126 | ret = -ENOENT; | |
127 | goto err; | |
128 | } | |
5caf2a00 | 129 | di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
134e9731 CM |
130 | struct btrfs_dir_item); |
131 | objectid = btrfs_dir_objectid(di); | |
132 | ||
5f26f772 CM |
133 | ret = btrfs_del_item(trans, root, path); |
134 | BUG_ON(ret); | |
135 | ||
136 | btrfs_release_path(root, path); | |
137 | ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
138 | objectid, -1); | |
139 | BUG_ON(ret); | |
5caf2a00 | 140 | ret = btrfs_del_item(trans, root, path); |
134e9731 CM |
141 | BUG_ON(ret); |
142 | dentry->d_inode->i_ctime = dir->i_ctime; | |
143 | err: | |
5caf2a00 CM |
144 | btrfs_release_path(root, path); |
145 | btrfs_free_path(path); | |
d4dbff95 | 146 | if (ret == 0) { |
134e9731 | 147 | inode_dec_link_count(dentry->d_inode); |
5f26f772 | 148 | dir->i_size -= name_len * 2; |
d4dbff95 CM |
149 | mark_inode_dirty(dir); |
150 | } | |
134e9731 CM |
151 | return ret; |
152 | } | |
153 | ||
5f443fd2 CM |
154 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
155 | { | |
156 | struct btrfs_root *root; | |
157 | struct btrfs_trans_handle *trans; | |
158 | int ret; | |
159 | ||
160 | root = btrfs_sb(dir->i_sb); | |
161 | mutex_lock(&root->fs_info->fs_mutex); | |
162 | trans = btrfs_start_transaction(root, 1); | |
163 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
164 | btrfs_end_transaction(trans, root); | |
165 | mutex_unlock(&root->fs_info->fs_mutex); | |
166 | return ret; | |
167 | } | |
168 | ||
169 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
170 | { | |
171 | struct inode *inode = dentry->d_inode; | |
172 | int err; | |
173 | int ret; | |
174 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
5caf2a00 | 175 | struct btrfs_path *path; |
5f443fd2 CM |
176 | struct btrfs_key key; |
177 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
178 | struct btrfs_key found_key; |
179 | int found_type; | |
5f443fd2 | 180 | struct btrfs_leaf *leaf; |
5f26f772 | 181 | char *goodnames = ".."; |
5f443fd2 | 182 | |
5caf2a00 CM |
183 | path = btrfs_alloc_path(); |
184 | BUG_ON(!path); | |
185 | btrfs_init_path(path); | |
5f443fd2 CM |
186 | mutex_lock(&root->fs_info->fs_mutex); |
187 | trans = btrfs_start_transaction(root, 1); | |
188 | key.objectid = inode->i_ino; | |
189 | key.offset = (u64)-1; | |
5f26f772 CM |
190 | key.flags = (u32)-1; |
191 | while(1) { | |
192 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
193 | if (ret < 0) { | |
194 | err = ret; | |
195 | goto out; | |
196 | } | |
197 | BUG_ON(ret == 0); | |
198 | if (path->slots[0] == 0) { | |
199 | err = -ENOENT; | |
200 | goto out; | |
201 | } | |
202 | path->slots[0]--; | |
203 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
204 | btrfs_disk_key_to_cpu(&found_key, | |
205 | &leaf->items[path->slots[0]].key); | |
206 | found_type = btrfs_key_type(&found_key); | |
207 | if (found_key.objectid != inode->i_ino) { | |
208 | err = -ENOENT; | |
209 | goto out; | |
210 | } | |
211 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
212 | found_type != BTRFS_DIR_INDEX_KEY) || | |
213 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
214 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
215 | err = -ENOTEMPTY; | |
216 | goto out; | |
217 | } | |
218 | ret = btrfs_del_item(trans, root, path); | |
219 | BUG_ON(ret); | |
5f443fd2 | 220 | |
5f26f772 CM |
221 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
222 | break; | |
223 | btrfs_release_path(root, path); | |
5f443fd2 | 224 | } |
5f26f772 | 225 | ret = 0; |
5caf2a00 | 226 | btrfs_release_path(root, path); |
5f443fd2 CM |
227 | |
228 | /* now the directory is empty */ | |
229 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
230 | if (!err) { | |
231 | inode->i_size = 0; | |
232 | } | |
233 | out: | |
7cfcc17e CM |
234 | btrfs_release_path(root, path); |
235 | btrfs_free_path(path); | |
5f443fd2 CM |
236 | mutex_unlock(&root->fs_info->fs_mutex); |
237 | ret = btrfs_end_transaction(trans, root); | |
238 | if (ret && !err) | |
239 | err = ret; | |
240 | return err; | |
241 | } | |
242 | ||
134e9731 CM |
243 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
244 | struct btrfs_root *root, | |
245 | struct inode *inode) | |
246 | { | |
247 | u64 objectid = inode->i_ino; | |
5caf2a00 | 248 | struct btrfs_path *path; |
134e9731 CM |
249 | struct btrfs_inode_map_item *map; |
250 | struct btrfs_key stat_data_key; | |
251 | int ret; | |
5caf2a00 | 252 | |
134e9731 | 253 | clear_inode(inode); |
5caf2a00 CM |
254 | |
255 | path = btrfs_alloc_path(); | |
256 | BUG_ON(!path); | |
257 | btrfs_init_path(path); | |
258 | ret = btrfs_lookup_inode_map(trans, root, path, objectid, -1); | |
134e9731 CM |
259 | if (ret) { |
260 | if (ret > 0) | |
261 | ret = -ENOENT; | |
134e9731 CM |
262 | goto error; |
263 | } | |
5caf2a00 | 264 | map = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
134e9731 CM |
265 | struct btrfs_inode_map_item); |
266 | btrfs_disk_key_to_cpu(&stat_data_key, &map->key); | |
5caf2a00 | 267 | ret = btrfs_del_item(trans, root->fs_info->inode_root, path); |
134e9731 | 268 | BUG_ON(ret); |
5caf2a00 | 269 | btrfs_release_path(root, path); |
134e9731 | 270 | |
5caf2a00 | 271 | ret = btrfs_lookup_inode(trans, root, path, objectid, -1); |
134e9731 | 272 | BUG_ON(ret); |
5caf2a00 | 273 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 274 | BUG_ON(ret); |
134e9731 | 275 | error: |
5caf2a00 CM |
276 | btrfs_release_path(root, path); |
277 | btrfs_free_path(path); | |
134e9731 CM |
278 | return ret; |
279 | } | |
280 | ||
f4b9aa8d CM |
281 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
282 | struct btrfs_root *root, | |
283 | struct inode *inode) | |
284 | { | |
285 | int ret; | |
5caf2a00 | 286 | struct btrfs_path *path; |
f4b9aa8d CM |
287 | struct btrfs_key key; |
288 | struct btrfs_disk_key *found_key; | |
289 | struct btrfs_leaf *leaf; | |
f254e52c CM |
290 | struct btrfs_file_extent_item *fi = NULL; |
291 | u64 extent_start = 0; | |
292 | u64 extent_num_blocks = 0; | |
293 | int found_extent; | |
f4b9aa8d | 294 | |
5caf2a00 CM |
295 | path = btrfs_alloc_path(); |
296 | BUG_ON(!path); | |
f4b9aa8d CM |
297 | /* FIXME, add redo link to tree so we don't leak on crash */ |
298 | key.objectid = inode->i_ino; | |
299 | key.offset = (u64)-1; | |
300 | key.flags = 0; | |
d4dbff95 CM |
301 | /* |
302 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
303 | * or extent data | |
304 | */ | |
f254e52c | 305 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 306 | while(1) { |
5caf2a00 CM |
307 | btrfs_init_path(path); |
308 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 309 | if (ret < 0) { |
f4b9aa8d CM |
310 | goto error; |
311 | } | |
312 | if (ret > 0) { | |
5caf2a00 CM |
313 | BUG_ON(path->slots[0] == 0); |
314 | path->slots[0]--; | |
f4b9aa8d | 315 | } |
5caf2a00 CM |
316 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
317 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
318 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
319 | break; | |
f254e52c | 320 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
d4dbff95 | 321 | btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY && |
f254e52c | 322 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
f4b9aa8d | 323 | break; |
f4b9aa8d CM |
324 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
325 | break; | |
f254e52c | 326 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
327 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
328 | path->slots[0], | |
f254e52c CM |
329 | struct btrfs_file_extent_item); |
330 | extent_start = btrfs_file_extent_disk_blocknr(fi); | |
331 | extent_num_blocks = | |
332 | btrfs_file_extent_disk_num_blocks(fi); | |
333 | inode->i_blocks -= | |
334 | btrfs_file_extent_num_blocks(fi) >> 9; | |
335 | found_extent = 1; | |
336 | } else { | |
337 | found_extent = 0; | |
338 | } | |
5caf2a00 | 339 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 340 | BUG_ON(ret); |
5caf2a00 | 341 | btrfs_release_path(root, path); |
f254e52c CM |
342 | if (found_extent) { |
343 | ret = btrfs_free_extent(trans, root, extent_start, | |
344 | extent_num_blocks, 0); | |
345 | BUG_ON(ret); | |
346 | } | |
f4b9aa8d | 347 | } |
f4b9aa8d CM |
348 | ret = 0; |
349 | error: | |
5caf2a00 CM |
350 | btrfs_release_path(root, path); |
351 | btrfs_free_path(path); | |
f4b9aa8d CM |
352 | return ret; |
353 | } | |
354 | ||
134e9731 CM |
355 | static void btrfs_delete_inode(struct inode *inode) |
356 | { | |
357 | struct btrfs_trans_handle *trans; | |
358 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
f4b9aa8d CM |
359 | int ret; |
360 | ||
134e9731 CM |
361 | truncate_inode_pages(&inode->i_data, 0); |
362 | if (is_bad_inode(inode)) { | |
363 | goto no_delete; | |
364 | } | |
365 | inode->i_size = 0; | |
134e9731 CM |
366 | mutex_lock(&root->fs_info->fs_mutex); |
367 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
368 | if (S_ISREG(inode->i_mode)) { |
369 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
370 | BUG_ON(ret); | |
371 | } | |
134e9731 CM |
372 | btrfs_free_inode(trans, root, inode); |
373 | btrfs_end_transaction(trans, root); | |
374 | mutex_unlock(&root->fs_info->fs_mutex); | |
375 | return; | |
376 | no_delete: | |
377 | clear_inode(inode); | |
378 | } | |
379 | ||
e20d96d6 CM |
380 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
381 | ino_t *ino) | |
382 | { | |
383 | const char *name = dentry->d_name.name; | |
384 | int namelen = dentry->d_name.len; | |
385 | struct btrfs_dir_item *di; | |
5caf2a00 | 386 | struct btrfs_path *path; |
e20d96d6 CM |
387 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
388 | int ret; | |
389 | ||
5caf2a00 CM |
390 | path = btrfs_alloc_path(); |
391 | BUG_ON(!path); | |
392 | btrfs_init_path(path); | |
393 | ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, | |
e20d96d6 | 394 | namelen, 0); |
5caf2a00 | 395 | if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) { |
e20d96d6 | 396 | *ino = 0; |
2c90e5d6 | 397 | ret = 0; |
e20d96d6 CM |
398 | goto out; |
399 | } | |
5caf2a00 | 400 | di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
e20d96d6 CM |
401 | struct btrfs_dir_item); |
402 | *ino = btrfs_dir_objectid(di); | |
403 | out: | |
5caf2a00 CM |
404 | btrfs_release_path(root, path); |
405 | btrfs_free_path(path); | |
2c90e5d6 | 406 | check_inode(dir); |
e20d96d6 CM |
407 | return ret; |
408 | } | |
409 | ||
410 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
411 | struct nameidata *nd) | |
412 | { | |
413 | struct inode * inode; | |
22b0ebda | 414 | struct btrfs_root *root = btrfs_sb(dir->i_sb); |
e20d96d6 CM |
415 | ino_t ino; |
416 | int ret; | |
417 | ||
418 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
419 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 420 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 421 | ret = btrfs_inode_by_name(dir, dentry, &ino); |
22b0ebda | 422 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
423 | if (ret < 0) |
424 | return ERR_PTR(ret); | |
425 | inode = NULL; | |
426 | if (ino) { | |
e20d96d6 CM |
427 | inode = iget(dir->i_sb, ino); |
428 | if (!inode) | |
429 | return ERR_PTR(-EACCES); | |
2c90e5d6 | 430 | check_inode(inode); |
e20d96d6 | 431 | } |
2c90e5d6 | 432 | check_inode(dir); |
e20d96d6 CM |
433 | return d_splice_alias(inode, dentry); |
434 | } | |
435 | ||
436 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
437 | { | |
438 | struct inode *inode = filp->f_path.dentry->d_inode; | |
439 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
440 | struct btrfs_item *item; | |
441 | struct btrfs_dir_item *di; | |
442 | struct btrfs_key key; | |
5caf2a00 | 443 | struct btrfs_path *path; |
e20d96d6 CM |
444 | int ret; |
445 | u32 nritems; | |
446 | struct btrfs_leaf *leaf; | |
447 | int slot; | |
448 | int advance; | |
449 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 450 | int over = 0; |
e20d96d6 | 451 | |
22b0ebda | 452 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 453 | key.objectid = inode->i_ino; |
e20d96d6 | 454 | key.flags = 0; |
bae45de0 | 455 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
e20d96d6 | 456 | key.offset = filp->f_pos; |
5caf2a00 CM |
457 | path = btrfs_alloc_path(); |
458 | btrfs_init_path(path); | |
459 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
e20d96d6 CM |
460 | if (ret < 0) { |
461 | goto err; | |
462 | } | |
7f5c1516 | 463 | advance = 0; |
e20d96d6 | 464 | while(1) { |
5caf2a00 | 465 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 466 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 467 | slot = path->slots[0]; |
dee26a9f CM |
468 | if (advance || slot >= nritems) { |
469 | if (slot >= nritems -1) { | |
5caf2a00 | 470 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
471 | if (ret) |
472 | break; | |
5caf2a00 | 473 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 474 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 475 | slot = path->slots[0]; |
e20d96d6 CM |
476 | } else { |
477 | slot++; | |
5caf2a00 | 478 | path->slots[0]++; |
e20d96d6 CM |
479 | } |
480 | } | |
481 | advance = 1; | |
482 | item = leaf->items + slot; | |
e20d96d6 CM |
483 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
484 | break; | |
bae45de0 | 485 | if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_INDEX_KEY) |
e20d96d6 | 486 | continue; |
7f5c1516 CM |
487 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
488 | continue; | |
dee26a9f CM |
489 | |
490 | advance = 1; | |
e20d96d6 | 491 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
492 | over = filldir(dirent, (const char *)(di + 1), |
493 | btrfs_dir_name_len(di), | |
494 | btrfs_disk_key_offset(&item->key), | |
495 | btrfs_dir_objectid(di), d_type); | |
7f5c1516 CM |
496 | if (over) { |
497 | filp->f_pos = btrfs_disk_key_offset(&item->key); | |
e20d96d6 | 498 | break; |
7f5c1516 | 499 | } |
e20d96d6 CM |
500 | filp->f_pos = btrfs_disk_key_offset(&item->key) + 1; |
501 | } | |
e20d96d6 CM |
502 | ret = 0; |
503 | err: | |
5caf2a00 CM |
504 | btrfs_release_path(root, path); |
505 | btrfs_free_path(path); | |
22b0ebda | 506 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
507 | return ret; |
508 | } | |
509 | ||
510 | static void btrfs_put_super (struct super_block * sb) | |
511 | { | |
512 | struct btrfs_root *root = btrfs_sb(sb); | |
513 | int ret; | |
514 | ||
515 | ret = close_ctree(root); | |
516 | if (ret) { | |
517 | printk("close ctree returns %d\n", ret); | |
518 | } | |
519 | sb->s_fs_info = NULL; | |
520 | } | |
2e635a27 CM |
521 | |
522 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
523 | { | |
524 | struct inode * inode; | |
e20d96d6 CM |
525 | struct dentry * root_dentry; |
526 | struct btrfs_super_block *disk_super; | |
e20d96d6 | 527 | struct btrfs_root *root; |
2e635a27 CM |
528 | |
529 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 530 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 531 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 532 | sb->s_time_gran = 1; |
e20d96d6 | 533 | |
2c90e5d6 | 534 | root = open_ctree(sb); |
d98237b3 | 535 | |
e20d96d6 CM |
536 | if (!root) { |
537 | printk("btrfs: open_ctree failed\n"); | |
538 | return -EIO; | |
539 | } | |
87cbda5c CM |
540 | sb->s_fs_info = root; |
541 | disk_super = root->fs_info->disk_super; | |
e20d96d6 CM |
542 | printk("read in super total blocks %Lu root %Lu\n", |
543 | btrfs_super_total_blocks(disk_super), | |
544 | btrfs_super_root_dir(disk_super)); | |
545 | ||
546 | inode = iget_locked(sb, btrfs_super_root_dir(disk_super)); | |
2e635a27 CM |
547 | if (!inode) |
548 | return -ENOMEM; | |
e20d96d6 CM |
549 | if (inode->i_state & I_NEW) { |
550 | btrfs_read_locked_inode(inode); | |
551 | unlock_new_inode(inode); | |
552 | } | |
2e635a27 | 553 | |
e20d96d6 CM |
554 | root_dentry = d_alloc_root(inode); |
555 | if (!root_dentry) { | |
2e635a27 CM |
556 | iput(inode); |
557 | return -ENOMEM; | |
558 | } | |
e20d96d6 CM |
559 | sb->s_root = root_dentry; |
560 | ||
2e635a27 CM |
561 | return 0; |
562 | } | |
563 | ||
d5719762 CM |
564 | static void fill_inode_item(struct btrfs_inode_item *item, |
565 | struct inode *inode) | |
566 | { | |
567 | btrfs_set_inode_uid(item, inode->i_uid); | |
568 | btrfs_set_inode_gid(item, inode->i_gid); | |
569 | btrfs_set_inode_size(item, inode->i_size); | |
570 | btrfs_set_inode_mode(item, inode->i_mode); | |
571 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
572 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
573 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
574 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
575 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
576 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
577 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
578 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
579 | btrfs_set_inode_generation(item, inode->i_generation); | |
2c90e5d6 | 580 | check_inode(inode); |
d5719762 CM |
581 | } |
582 | ||
4730a4bc CM |
583 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
584 | struct btrfs_root *root, | |
585 | struct inode *inode) | |
586 | { | |
587 | struct btrfs_inode_item *inode_item; | |
5caf2a00 | 588 | struct btrfs_path *path; |
4730a4bc CM |
589 | int ret; |
590 | ||
5caf2a00 CM |
591 | path = btrfs_alloc_path(); |
592 | BUG_ON(!path); | |
593 | btrfs_init_path(path); | |
4730a4bc | 594 | |
5caf2a00 | 595 | ret = btrfs_lookup_inode(trans, root, path, inode->i_ino, 1); |
4730a4bc CM |
596 | if (ret) { |
597 | if (ret > 0) | |
598 | ret = -ENOENT; | |
599 | goto failed; | |
600 | } | |
601 | ||
5caf2a00 CM |
602 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
603 | path->slots[0], | |
4730a4bc CM |
604 | struct btrfs_inode_item); |
605 | ||
606 | fill_inode_item(inode_item, inode); | |
5caf2a00 | 607 | btrfs_mark_buffer_dirty(path->nodes[0]); |
4730a4bc | 608 | failed: |
5caf2a00 CM |
609 | btrfs_release_path(root, path); |
610 | btrfs_free_path(path); | |
2c90e5d6 | 611 | check_inode(inode); |
4730a4bc CM |
612 | return 0; |
613 | } | |
614 | ||
615 | static int btrfs_write_inode(struct inode *inode, int wait) | |
616 | { | |
617 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
618 | struct btrfs_trans_handle *trans; | |
619 | int ret; | |
620 | ||
621 | mutex_lock(&root->fs_info->fs_mutex); | |
622 | trans = btrfs_start_transaction(root, 1); | |
623 | ret = btrfs_update_inode(trans, root, inode); | |
624 | if (wait) | |
625 | btrfs_commit_transaction(trans, root); | |
626 | else | |
627 | btrfs_end_transaction(trans, root); | |
628 | mutex_unlock(&root->fs_info->fs_mutex); | |
2c90e5d6 | 629 | check_inode(inode); |
4730a4bc CM |
630 | return ret; |
631 | } | |
632 | ||
d5719762 CM |
633 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
634 | struct inode *dir, int mode) | |
635 | { | |
636 | struct inode *inode; | |
637 | struct btrfs_inode_item inode_item; | |
638 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
639 | struct btrfs_key key; | |
640 | int ret; | |
641 | u64 objectid; | |
642 | ||
643 | inode = new_inode(dir->i_sb); | |
644 | if (!inode) | |
645 | return ERR_PTR(-ENOMEM); | |
646 | ||
2c90e5d6 | 647 | check_inode(inode); |
d5719762 CM |
648 | ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
649 | BUG_ON(ret); | |
650 | ||
651 | inode->i_uid = current->fsuid; | |
652 | inode->i_gid = current->fsgid; | |
653 | inode->i_mode = mode; | |
654 | inode->i_ino = objectid; | |
655 | inode->i_blocks = 0; | |
656 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
657 | fill_inode_item(&inode_item, inode); | |
658 | ||
d5719762 CM |
659 | key.objectid = objectid; |
660 | key.flags = 0; | |
661 | key.offset = 0; | |
662 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
663 | ret = btrfs_insert_inode_map(trans, root, objectid, &key); | |
664 | BUG_ON(ret); | |
665 | ||
666 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
667 | BUG_ON(ret); | |
668 | ||
669 | insert_inode_hash(inode); | |
2c90e5d6 CM |
670 | check_inode(inode); |
671 | check_inode(dir); | |
d5719762 CM |
672 | return inode; |
673 | } | |
674 | ||
675 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
676 | struct dentry *dentry, struct inode *inode) | |
677 | { | |
678 | int ret; | |
679 | ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb), | |
680 | dentry->d_name.name, dentry->d_name.len, | |
681 | dentry->d_parent->d_inode->i_ino, | |
682 | inode->i_ino, 0); | |
4730a4bc | 683 | if (ret == 0) { |
5f26f772 | 684 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
4730a4bc CM |
685 | ret = btrfs_update_inode(trans, btrfs_sb(inode->i_sb), |
686 | dentry->d_parent->d_inode); | |
687 | } | |
2c90e5d6 CM |
688 | check_inode(inode); |
689 | check_inode(dentry->d_parent->d_inode); | |
d5719762 CM |
690 | return ret; |
691 | } | |
692 | ||
693 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
694 | struct dentry *dentry, struct inode *inode) | |
695 | { | |
696 | int err = btrfs_add_link(trans, dentry, inode); | |
697 | if (!err) { | |
698 | d_instantiate(dentry, inode); | |
699 | return 0; | |
700 | } | |
2c90e5d6 CM |
701 | if (err > 0) |
702 | err = -EEXIST; | |
703 | check_inode(inode); | |
d5719762 CM |
704 | return err; |
705 | } | |
706 | ||
707 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
708 | int mode, struct nameidata *nd) | |
709 | { | |
710 | struct btrfs_trans_handle *trans; | |
711 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
712 | struct inode *inode; | |
713 | int err; | |
134e9731 | 714 | int drop_inode = 0; |
d5719762 | 715 | |
d561c025 | 716 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
717 | trans = btrfs_start_transaction(root, 1); |
718 | inode = btrfs_new_inode(trans, dir, mode); | |
719 | err = PTR_ERR(inode); | |
720 | if (IS_ERR(inode)) | |
d561c025 | 721 | goto out_unlock; |
d5719762 CM |
722 | // FIXME mark the inode dirty |
723 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
724 | if (err) |
725 | drop_inode = 1; | |
dee26a9f CM |
726 | else { |
727 | inode->i_mapping->a_ops = &btrfs_aops; | |
728 | inode->i_fop = &btrfs_file_operations; | |
729 | inode->i_op = &btrfs_file_inode_operations; | |
730 | } | |
d5719762 | 731 | dir->i_sb->s_dirt = 1; |
d561c025 | 732 | out_unlock: |
22b0ebda | 733 | btrfs_end_transaction(trans, root); |
d561c025 | 734 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 CM |
735 | check_inode(inode); |
736 | check_inode(dir); | |
737 | ||
134e9731 CM |
738 | if (drop_inode) { |
739 | inode_dec_link_count(inode); | |
740 | iput(inode); | |
741 | } | |
d5719762 CM |
742 | return err; |
743 | } | |
744 | ||
f7922033 CM |
745 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
746 | struct inode *inode, struct inode *dir) | |
747 | { | |
748 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
749 | int ret; | |
750 | char buf[2]; | |
751 | buf[0] = '.'; | |
752 | buf[1] = '.'; | |
753 | ||
754 | ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino, | |
755 | inode->i_ino, 1); | |
756 | if (ret) | |
757 | goto error; | |
758 | ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino, | |
759 | dir->i_ino, 1); | |
4730a4bc CM |
760 | if (ret) |
761 | goto error; | |
5f26f772 | 762 | inode->i_size = 6; |
4730a4bc | 763 | ret = btrfs_update_inode(trans, root, inode); |
f7922033 CM |
764 | error: |
765 | return ret; | |
766 | } | |
767 | ||
768 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
769 | { | |
770 | struct inode *inode; | |
771 | struct btrfs_trans_handle *trans; | |
772 | struct btrfs_root *root = btrfs_sb(dir->i_sb); | |
773 | int err = 0; | |
774 | int drop_on_err = 0; | |
775 | ||
776 | mutex_lock(&root->fs_info->fs_mutex); | |
777 | trans = btrfs_start_transaction(root, 1); | |
778 | if (IS_ERR(trans)) { | |
779 | err = PTR_ERR(trans); | |
780 | goto out_unlock; | |
781 | } | |
782 | inode = btrfs_new_inode(trans, dir, S_IFDIR | mode); | |
783 | if (IS_ERR(inode)) { | |
784 | err = PTR_ERR(inode); | |
785 | goto out_fail; | |
786 | } | |
787 | drop_on_err = 1; | |
788 | inode->i_op = &btrfs_dir_inode_operations; | |
789 | inode->i_fop = &btrfs_dir_file_operations; | |
790 | ||
791 | err = btrfs_make_empty_dir(trans, inode, dir); | |
792 | if (err) | |
793 | goto out_fail; | |
794 | err = btrfs_add_link(trans, dentry, inode); | |
795 | if (err) | |
796 | goto out_fail; | |
797 | d_instantiate(dentry, inode); | |
f7922033 CM |
798 | drop_on_err = 0; |
799 | ||
800 | out_fail: | |
801 | btrfs_end_transaction(trans, root); | |
802 | out_unlock: | |
803 | mutex_unlock(&root->fs_info->fs_mutex); | |
804 | if (drop_on_err) | |
805 | iput(inode); | |
806 | return err; | |
807 | } | |
808 | ||
d5719762 CM |
809 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
810 | { | |
811 | struct btrfs_trans_handle *trans; | |
812 | struct btrfs_root *root; | |
813 | int ret; | |
d98237b3 | 814 | root = btrfs_sb(sb); |
df2ce34c | 815 | |
d5719762 | 816 | sb->s_dirt = 0; |
d561c025 | 817 | if (!wait) { |
7cfcc17e | 818 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
819 | return 0; |
820 | } | |
7cfcc17e | 821 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
d561c025 | 822 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
823 | trans = btrfs_start_transaction(root, 1); |
824 | ret = btrfs_commit_transaction(trans, root); | |
825 | sb->s_dirt = 0; | |
826 | BUG_ON(ret); | |
827 | printk("btrfs sync_fs\n"); | |
d561c025 | 828 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
829 | return 0; |
830 | } | |
831 | ||
e8f05c45 | 832 | #if 0 |
df24a2b9 CM |
833 | static int btrfs_get_block_inline(struct inode *inode, sector_t iblock, |
834 | struct buffer_head *result, int create) | |
835 | { | |
836 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
837 | struct btrfs_path *path; | |
838 | struct btrfs_key key; | |
839 | struct btrfs_leaf *leaf; | |
840 | int num_bytes = result->b_size; | |
841 | int item_size; | |
842 | int ret; | |
843 | u64 pos; | |
844 | char *ptr; | |
845 | int copy_size; | |
846 | int err = 0; | |
847 | char *safe_ptr; | |
848 | char *data_ptr; | |
849 | ||
850 | path = btrfs_alloc_path(); | |
851 | BUG_ON(!path); | |
852 | ||
853 | WARN_ON(create); | |
854 | if (create) { | |
855 | return 0; | |
856 | } | |
857 | pos = iblock << inode->i_blkbits; | |
858 | key.objectid = inode->i_ino; | |
859 | key.flags = 0; | |
860 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); | |
861 | ptr = kmap(result->b_page); | |
862 | safe_ptr = ptr; | |
863 | ptr += (pos & (PAGE_CACHE_SIZE -1)); | |
864 | again: | |
865 | key.offset = pos; | |
866 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
867 | if (ret) { | |
868 | if (ret < 0) | |
869 | err = ret; | |
870 | else | |
871 | err = 0; | |
872 | goto out; | |
873 | } | |
874 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
875 | item_size = btrfs_item_size(leaf->items + path->slots[0]); | |
876 | copy_size = min(num_bytes, item_size); | |
877 | data_ptr = btrfs_item_ptr(leaf, path->slots[0], char); | |
878 | WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size); | |
879 | memcpy(ptr, data_ptr, copy_size); | |
880 | pos += copy_size; | |
881 | num_bytes -= copy_size; | |
882 | WARN_ON(num_bytes < 0); | |
883 | ptr += copy_size; | |
884 | btrfs_release_path(root, path); | |
885 | if (num_bytes != 0) { | |
886 | if (pos >= i_size_read(inode)) | |
887 | memset(ptr, 0, num_bytes); | |
888 | else | |
889 | goto again; | |
890 | } | |
891 | set_buffer_uptodate(result); | |
892 | map_bh(result, inode->i_sb, 0); | |
893 | err = 0; | |
894 | out: | |
895 | btrfs_free_path(path); | |
896 | kunmap(result->b_page); | |
897 | return err; | |
898 | } | |
e8f05c45 | 899 | #endif |
df24a2b9 | 900 | |
75dfe396 | 901 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
902 | struct buffer_head *result, int create) |
903 | { | |
904 | int ret; | |
905 | int err = 0; | |
906 | u64 blocknr; | |
907 | u64 extent_start = 0; | |
908 | u64 extent_end = 0; | |
909 | u64 objectid = inode->i_ino; | |
5caf2a00 | 910 | struct btrfs_path *path; |
dee26a9f CM |
911 | struct btrfs_root *root = btrfs_sb(inode->i_sb); |
912 | struct btrfs_trans_handle *trans = NULL; | |
913 | struct btrfs_file_extent_item *item; | |
914 | struct btrfs_leaf *leaf; | |
915 | struct btrfs_disk_key *found_key; | |
916 | ||
5caf2a00 CM |
917 | path = btrfs_alloc_path(); |
918 | BUG_ON(!path); | |
919 | btrfs_init_path(path); | |
dee26a9f CM |
920 | if (create) |
921 | trans = btrfs_start_transaction(root, 1); | |
922 | ||
5caf2a00 | 923 | ret = btrfs_lookup_file_extent(trans, root, path, |
9773a788 CM |
924 | inode->i_ino, |
925 | iblock << inode->i_blkbits, 0); | |
dee26a9f | 926 | if (ret < 0) { |
dee26a9f CM |
927 | err = ret; |
928 | goto out; | |
929 | } | |
930 | ||
931 | if (ret != 0) { | |
5caf2a00 CM |
932 | if (path->slots[0] == 0) { |
933 | btrfs_release_path(root, path); | |
dee26a9f CM |
934 | goto allocate; |
935 | } | |
5caf2a00 | 936 | path->slots[0]--; |
dee26a9f CM |
937 | } |
938 | ||
5caf2a00 | 939 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 940 | struct btrfs_file_extent_item); |
5caf2a00 | 941 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
942 | blocknr = btrfs_file_extent_disk_blocknr(item); |
943 | blocknr += btrfs_file_extent_offset(item); | |
944 | ||
945 | /* exact match found, use it */ | |
946 | if (ret == 0) { | |
947 | err = 0; | |
948 | map_bh(result, inode->i_sb, blocknr); | |
dee26a9f CM |
949 | goto out; |
950 | } | |
951 | ||
952 | /* are we inside the extent that was found? */ | |
5caf2a00 | 953 | found_key = &leaf->items[path->slots[0]].key; |
dee26a9f CM |
954 | if (btrfs_disk_key_objectid(found_key) != objectid || |
955 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { | |
956 | extent_end = 0; | |
957 | extent_start = 0; | |
5caf2a00 | 958 | btrfs_release_path(root, path); |
dee26a9f CM |
959 | goto allocate; |
960 | } | |
961 | ||
5caf2a00 | 962 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); |
9773a788 | 963 | extent_start = extent_start >> inode->i_blkbits; |
dee26a9f CM |
964 | extent_start += btrfs_file_extent_offset(item); |
965 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
dee26a9f CM |
966 | if (iblock >= extent_start && iblock < extent_end) { |
967 | err = 0; | |
968 | map_bh(result, inode->i_sb, blocknr + iblock - extent_start); | |
969 | goto out; | |
970 | } | |
971 | allocate: | |
972 | /* ok, create a new extent */ | |
973 | if (!create) { | |
974 | err = 0; | |
975 | goto out; | |
976 | } | |
9773a788 CM |
977 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
978 | iblock << inode->i_blkbits, | |
dee26a9f CM |
979 | 1, extent_end, &blocknr); |
980 | if (ret) { | |
981 | err = ret; | |
982 | goto out; | |
983 | } | |
f4b9aa8d CM |
984 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
985 | set_buffer_new(result); | |
dee26a9f CM |
986 | map_bh(result, inode->i_sb, blocknr); |
987 | ||
988 | out: | |
5caf2a00 CM |
989 | btrfs_release_path(root, path); |
990 | btrfs_free_path(path); | |
dee26a9f CM |
991 | if (trans) |
992 | btrfs_end_transaction(trans, root); | |
75dfe396 CM |
993 | return err; |
994 | } | |
995 | ||
996 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
997 | struct buffer_head *result, int create) | |
998 | { | |
999 | int err; | |
1000 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
1001 | mutex_lock(&root->fs_info->fs_mutex); | |
e8f05c45 CM |
1002 | err = btrfs_get_block_lock(inode, iblock, result, create); |
1003 | // err = btrfs_get_block_inline(inode, iblock, result, create); | |
dee26a9f CM |
1004 | mutex_unlock(&root->fs_info->fs_mutex); |
1005 | return err; | |
1006 | } | |
1007 | ||
1008 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1009 | unsigned from, unsigned to) | |
1010 | { | |
6407bf6d | 1011 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f | 1012 | } |
75dfe396 CM |
1013 | static int btrfs_commit_write(struct file *file, struct page *page, |
1014 | unsigned from, unsigned to) | |
1015 | { | |
75dfe396 CM |
1016 | return nobh_commit_write(file, page, from, to); |
1017 | } | |
dee26a9f | 1018 | |
d561c025 CM |
1019 | static void btrfs_write_super(struct super_block *sb) |
1020 | { | |
1021 | btrfs_sync_fs(sb, 1); | |
1022 | } | |
1023 | ||
dee26a9f CM |
1024 | static int btrfs_readpage(struct file *file, struct page *page) |
1025 | { | |
1026 | return mpage_readpage(page, btrfs_get_block); | |
1027 | } | |
1028 | ||
1029 | static int btrfs_readpages(struct file *file, struct address_space *mapping, | |
1030 | struct list_head *pages, unsigned nr_pages) | |
1031 | { | |
1032 | return mpage_readpages(mapping, pages, nr_pages, btrfs_get_block); | |
1033 | } | |
1034 | ||
1035 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) | |
1036 | { | |
6407bf6d | 1037 | return nobh_writepage(page, btrfs_get_block, wbc); |
dee26a9f | 1038 | } |
d561c025 | 1039 | |
f4b9aa8d CM |
1040 | static void btrfs_truncate(struct inode *inode) |
1041 | { | |
1042 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
1043 | int ret; | |
1044 | struct btrfs_trans_handle *trans; | |
1045 | ||
1046 | if (!S_ISREG(inode->i_mode)) | |
1047 | return; | |
1048 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1049 | return; | |
1050 | ||
e8f05c45 | 1051 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1052 | |
1053 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1054 | mutex_lock(&root->fs_info->fs_mutex); | |
1055 | trans = btrfs_start_transaction(root, 1); | |
1056 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
1057 | BUG_ON(ret); | |
1058 | ret = btrfs_end_transaction(trans, root); | |
1059 | BUG_ON(ret); | |
1060 | mutex_unlock(&root->fs_info->fs_mutex); | |
1061 | mark_inode_dirty(inode); | |
1062 | } | |
1063 | ||
75dfe396 CM |
1064 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1065 | struct page **prepared_pages, | |
1066 | const char __user * buf) | |
1067 | { | |
1068 | long page_fault = 0; | |
1069 | int i; | |
1070 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1071 | ||
1072 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1073 | size_t count = min_t(size_t, | |
1074 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1075 | struct page *page = prepared_pages[i]; | |
1076 | fault_in_pages_readable(buf, count); | |
1077 | ||
1078 | /* Copy data from userspace to the current page */ | |
1079 | kmap(page); | |
1080 | page_fault = __copy_from_user(page_address(page) + offset, | |
1081 | buf, count); | |
1082 | /* Flush processor's dcache for this page */ | |
1083 | flush_dcache_page(page); | |
1084 | kunmap(page); | |
1085 | buf += count; | |
1086 | write_bytes -= count; | |
1087 | ||
1088 | if (page_fault) | |
1089 | break; | |
1090 | } | |
1091 | return page_fault ? -EFAULT : 0; | |
1092 | } | |
1093 | ||
1094 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1095 | { | |
1096 | size_t i; | |
1097 | for (i = 0; i < num_pages; i++) { | |
1098 | if (!pages[i]) | |
1099 | break; | |
1100 | unlock_page(pages[i]); | |
1101 | mark_page_accessed(pages[i]); | |
1102 | page_cache_release(pages[i]); | |
1103 | } | |
1104 | } | |
1105 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1106 | struct btrfs_root *root, | |
1107 | struct file *file, | |
1108 | struct page **pages, | |
1109 | size_t num_pages, | |
1110 | loff_t pos, | |
1111 | size_t write_bytes) | |
1112 | { | |
1113 | int i; | |
1114 | int offset; | |
1115 | int err = 0; | |
1116 | int ret; | |
1117 | int this_write; | |
f254e52c | 1118 | struct inode *inode = file->f_path.dentry->d_inode; |
75dfe396 CM |
1119 | |
1120 | for (i = 0; i < num_pages; i++) { | |
1121 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1122 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1123 | /* FIXME, one block at a time */ |
1124 | ||
1125 | mutex_lock(&root->fs_info->fs_mutex); | |
1126 | trans = btrfs_start_transaction(root, 1); | |
1127 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
1128 | pages[i]->index << PAGE_CACHE_SHIFT, | |
1129 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
1130 | kunmap(pages[i]); | |
1131 | SetPageChecked(pages[i]); | |
1132 | ret = btrfs_end_transaction(trans, root); | |
1133 | BUG_ON(ret); | |
1134 | mutex_unlock(&root->fs_info->fs_mutex); | |
1135 | ||
75dfe396 CM |
1136 | ret = nobh_commit_write(file, pages[i], offset, |
1137 | offset + this_write); | |
1138 | pos += this_write; | |
1139 | if (ret) { | |
1140 | err = ret; | |
1141 | goto failed; | |
1142 | } | |
1143 | WARN_ON(this_write > write_bytes); | |
1144 | write_bytes -= this_write; | |
1145 | } | |
1146 | failed: | |
1147 | return err; | |
1148 | } | |
1149 | ||
1150 | static int prepare_pages(struct btrfs_trans_handle *trans, | |
1151 | struct btrfs_root *root, | |
1152 | struct file *file, | |
1153 | struct page **pages, | |
1154 | size_t num_pages, | |
1155 | loff_t pos, | |
1156 | size_t write_bytes) | |
1157 | { | |
1158 | int i; | |
1159 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1160 | struct inode *inode = file->f_path.dentry->d_inode; | |
1161 | int offset; | |
1162 | int err = 0; | |
1163 | int ret; | |
1164 | int this_write; | |
1165 | loff_t isize = i_size_read(inode); | |
1166 | ||
1167 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1168 | ||
1169 | for (i = 0; i < num_pages; i++) { | |
1170 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1171 | if (!pages[i]) { | |
1172 | err = -ENOMEM; | |
1173 | goto failed_release; | |
1174 | } | |
1175 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1176 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
1177 | ret = nobh_prepare_write(pages[i], offset, | |
1178 | offset + this_write, | |
f254e52c | 1179 | btrfs_get_block); |
75dfe396 CM |
1180 | pos += this_write; |
1181 | if (ret) { | |
1182 | err = ret; | |
1183 | goto failed_truncate; | |
1184 | } | |
1185 | WARN_ON(this_write > write_bytes); | |
1186 | write_bytes -= this_write; | |
1187 | } | |
1188 | return 0; | |
1189 | ||
1190 | failed_release: | |
1191 | btrfs_drop_pages(pages, num_pages); | |
1192 | return err; | |
1193 | ||
1194 | failed_truncate: | |
1195 | btrfs_drop_pages(pages, num_pages); | |
1196 | if (pos > isize) | |
1197 | vmtruncate(inode, isize); | |
1198 | return err; | |
1199 | } | |
1200 | ||
1201 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1202 | size_t count, loff_t *ppos) | |
1203 | { | |
1204 | loff_t pos; | |
1205 | size_t num_written = 0; | |
1206 | int err = 0; | |
1207 | int ret = 0; | |
75dfe396 CM |
1208 | struct inode *inode = file->f_path.dentry->d_inode; |
1209 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
1210 | struct page *pages[1]; | |
1211 | ||
1212 | if (file->f_flags & O_DIRECT) | |
1213 | return -EINVAL; | |
1214 | pos = *ppos; | |
1215 | ||
1216 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1217 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1218 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1219 | if (err) | |
1220 | goto out; | |
1221 | if (count == 0) | |
1222 | goto out; | |
1223 | err = remove_suid(file->f_path.dentry); | |
1224 | if (err) | |
1225 | goto out; | |
1226 | file_update_time(file); | |
1227 | mutex_lock(&inode->i_mutex); | |
1228 | while(count > 0) { | |
1229 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1230 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1231 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1232 | PAGE_CACHE_SHIFT; | |
f254e52c | 1233 | ret = prepare_pages(NULL, root, file, pages, num_pages, |
75dfe396 CM |
1234 | pos, write_bytes); |
1235 | BUG_ON(ret); | |
1236 | ret = btrfs_copy_from_user(pos, num_pages, | |
1237 | write_bytes, pages, buf); | |
1238 | BUG_ON(ret); | |
1239 | ||
f254e52c | 1240 | ret = dirty_and_release_pages(NULL, root, file, pages, |
75dfe396 CM |
1241 | num_pages, pos, write_bytes); |
1242 | BUG_ON(ret); | |
1243 | btrfs_drop_pages(pages, num_pages); | |
1244 | ||
75dfe396 CM |
1245 | buf += write_bytes; |
1246 | count -= write_bytes; | |
1247 | pos += write_bytes; | |
1248 | num_written += write_bytes; | |
1249 | ||
1250 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1251 | cond_resched(); | |
1252 | } | |
1253 | mutex_unlock(&inode->i_mutex); | |
1254 | out: | |
1255 | *ppos = pos; | |
1256 | current->backing_dev_info = NULL; | |
1257 | return num_written ? num_written : err; | |
1258 | } | |
1259 | ||
e8f05c45 | 1260 | #if 0 |
df24a2b9 CM |
1261 | static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode, |
1262 | struct page *page, loff_t pos, | |
1263 | size_t offset, size_t write_bytes) | |
1264 | { | |
1265 | struct btrfs_path *path; | |
1266 | struct btrfs_trans_handle *trans; | |
1267 | struct btrfs_key key; | |
1268 | struct btrfs_leaf *leaf; | |
1269 | struct btrfs_key found_key; | |
1270 | int ret; | |
1271 | size_t copy_size = 0; | |
1272 | char *dst = NULL; | |
1273 | int err = 0; | |
1274 | size_t num_written = 0; | |
1275 | ||
1276 | path = btrfs_alloc_path(); | |
1277 | BUG_ON(!path); | |
1278 | mutex_lock(&root->fs_info->fs_mutex); | |
1279 | trans = btrfs_start_transaction(root, 1); | |
1280 | key.objectid = inode->i_ino; | |
1281 | key.flags = 0; | |
1282 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); | |
1283 | ||
1284 | again: | |
1285 | key.offset = pos; | |
1286 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1287 | if (ret < 0) { | |
1288 | err = ret; | |
1289 | goto out; | |
1290 | } | |
1291 | if (ret == 0) { | |
1292 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1293 | btrfs_disk_key_to_cpu(&found_key, | |
1294 | &leaf->items[path->slots[0]].key); | |
1295 | copy_size = btrfs_item_size(leaf->items + path->slots[0]); | |
1296 | dst = btrfs_item_ptr(leaf, path->slots[0], char); | |
1297 | copy_size = min(write_bytes, copy_size); | |
1298 | goto copyit; | |
1299 | } else { | |
1300 | int slot = path->slots[0]; | |
1301 | if (slot > 0) { | |
1302 | slot--; | |
1303 | } | |
1304 | // FIXME find max key | |
1305 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1306 | btrfs_disk_key_to_cpu(&found_key, | |
1307 | &leaf->items[slot].key); | |
1308 | if (found_key.objectid != inode->i_ino) | |
1309 | goto insert; | |
1310 | if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY) | |
1311 | goto insert; | |
1312 | copy_size = btrfs_item_size(leaf->items + slot); | |
1313 | if (found_key.offset + copy_size <= pos) | |
1314 | goto insert; | |
1315 | dst = btrfs_item_ptr(leaf, path->slots[0], char); | |
1316 | dst += pos - found_key.offset; | |
1317 | copy_size = copy_size - (pos - found_key.offset); | |
1318 | BUG_ON(copy_size < 0); | |
1319 | copy_size = min(write_bytes, copy_size); | |
1320 | WARN_ON(copy_size == 0); | |
1321 | goto copyit; | |
1322 | } | |
1323 | insert: | |
1324 | btrfs_release_path(root, path); | |
d4dbff95 CM |
1325 | copy_size = min(write_bytes, |
1326 | (size_t)BTRFS_LEAF_DATA_SIZE(root) - | |
1327 | sizeof(struct btrfs_item) * 4); | |
df24a2b9 CM |
1328 | ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size); |
1329 | BUG_ON(ret); | |
1330 | dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1331 | path->slots[0], char); | |
1332 | copyit: | |
1333 | WARN_ON(copy_size == 0); | |
1334 | WARN_ON(dst + copy_size > | |
1335 | btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1336 | path->slots[0], char) + | |
1337 | btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items + | |
1338 | path->slots[0])); | |
1339 | btrfs_memcpy(root, path->nodes[0]->b_data, dst, | |
1340 | page_address(page) + offset, copy_size); | |
1341 | mark_buffer_dirty(path->nodes[0]); | |
1342 | btrfs_release_path(root, path); | |
1343 | pos += copy_size; | |
1344 | offset += copy_size; | |
1345 | num_written += copy_size; | |
1346 | write_bytes -= copy_size; | |
1347 | if (write_bytes) | |
1348 | goto again; | |
1349 | out: | |
1350 | btrfs_free_path(path); | |
1351 | ret = btrfs_end_transaction(trans, root); | |
1352 | BUG_ON(ret); | |
1353 | mutex_unlock(&root->fs_info->fs_mutex); | |
1354 | return num_written ? num_written : err; | |
1355 | } | |
1356 | ||
1357 | static ssize_t btrfs_file_inline_write(struct file *file, | |
1358 | const char __user *buf, | |
1359 | size_t count, loff_t *ppos) | |
1360 | { | |
1361 | loff_t pos; | |
1362 | size_t num_written = 0; | |
1363 | int err = 0; | |
1364 | int ret = 0; | |
1365 | struct inode *inode = file->f_path.dentry->d_inode; | |
1366 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
1367 | unsigned long page_index; | |
1368 | ||
1369 | if (file->f_flags & O_DIRECT) | |
1370 | return -EINVAL; | |
1371 | pos = *ppos; | |
1372 | ||
1373 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1374 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1375 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1376 | if (err) | |
1377 | goto out; | |
1378 | if (count == 0) | |
1379 | goto out; | |
1380 | err = remove_suid(file->f_path.dentry); | |
1381 | if (err) | |
1382 | goto out; | |
1383 | file_update_time(file); | |
1384 | mutex_lock(&inode->i_mutex); | |
1385 | while(count > 0) { | |
1386 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1387 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1388 | struct page *page; | |
1389 | ||
1390 | page_index = pos >> PAGE_CACHE_SHIFT; | |
1391 | page = grab_cache_page(inode->i_mapping, page_index); | |
1392 | if (!PageUptodate(page)) { | |
1393 | ret = mpage_readpage(page, btrfs_get_block); | |
1394 | BUG_ON(ret); | |
1395 | lock_page(page); | |
1396 | } | |
1397 | ret = btrfs_copy_from_user(pos, 1, | |
1398 | write_bytes, &page, buf); | |
1399 | BUG_ON(ret); | |
1400 | write_bytes = inline_one_page(root, inode, page, pos, | |
1401 | offset, write_bytes); | |
1402 | SetPageUptodate(page); | |
1403 | if (write_bytes > 0 && pos + write_bytes > inode->i_size) { | |
1404 | i_size_write(inode, pos + write_bytes); | |
1405 | mark_inode_dirty(inode); | |
1406 | } | |
1407 | page_cache_release(page); | |
1408 | unlock_page(page); | |
1409 | if (write_bytes < 0) | |
1410 | goto out_unlock; | |
1411 | buf += write_bytes; | |
1412 | count -= write_bytes; | |
1413 | pos += write_bytes; | |
1414 | num_written += write_bytes; | |
1415 | ||
1416 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1417 | cond_resched(); | |
1418 | } | |
1419 | out_unlock: | |
1420 | mutex_unlock(&inode->i_mutex); | |
1421 | out: | |
1422 | *ppos = pos; | |
1423 | current->backing_dev_info = NULL; | |
1424 | return num_written ? num_written : err; | |
1425 | } | |
e8f05c45 | 1426 | #endif |
df24a2b9 | 1427 | |
f254e52c CM |
1428 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1429 | unsigned long offset, unsigned long size) | |
1430 | { | |
1431 | char *kaddr; | |
1432 | unsigned long left, count = desc->count; | |
1433 | ||
1434 | if (size > count) | |
1435 | size = count; | |
1436 | ||
1437 | if (!PageChecked(page)) { | |
1438 | /* FIXME, do it per block */ | |
1439 | struct btrfs_root *root = btrfs_sb(page->mapping->host->i_sb); | |
1440 | int ret = btrfs_csum_verify_file_block(root, | |
1441 | page->mapping->host->i_ino, | |
1442 | page->index << PAGE_CACHE_SHIFT, | |
1443 | kmap(page), PAGE_CACHE_SIZE); | |
1444 | if (ret) { | |
1445 | printk("failed to verify ino %lu page %lu\n", | |
1446 | page->mapping->host->i_ino, | |
1447 | page->index); | |
1448 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
1449 | } | |
1450 | SetPageChecked(page); | |
1451 | kunmap(page); | |
1452 | } | |
1453 | /* | |
1454 | * Faults on the destination of a read are common, so do it before | |
1455 | * taking the kmap. | |
1456 | */ | |
1457 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
1458 | kaddr = kmap_atomic(page, KM_USER0); | |
1459 | left = __copy_to_user_inatomic(desc->arg.buf, | |
1460 | kaddr + offset, size); | |
1461 | kunmap_atomic(kaddr, KM_USER0); | |
1462 | if (left == 0) | |
1463 | goto success; | |
1464 | } | |
1465 | ||
1466 | /* Do it the slow way */ | |
1467 | kaddr = kmap(page); | |
1468 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
1469 | kunmap(page); | |
1470 | ||
1471 | if (left) { | |
1472 | size -= left; | |
1473 | desc->error = -EFAULT; | |
1474 | } | |
1475 | success: | |
1476 | desc->count = count - size; | |
1477 | desc->written += size; | |
1478 | desc->arg.buf += size; | |
1479 | return size; | |
1480 | } | |
1481 | ||
1482 | /** | |
1483 | * btrfs_file_aio_read - filesystem read routine | |
1484 | * @iocb: kernel I/O control block | |
1485 | * @iov: io vector request | |
1486 | * @nr_segs: number of segments in the iovec | |
1487 | * @pos: current file position | |
1488 | */ | |
1489 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
1490 | unsigned long nr_segs, loff_t pos) | |
1491 | { | |
1492 | struct file *filp = iocb->ki_filp; | |
1493 | ssize_t retval; | |
1494 | unsigned long seg; | |
1495 | size_t count; | |
1496 | loff_t *ppos = &iocb->ki_pos; | |
1497 | ||
1498 | count = 0; | |
1499 | for (seg = 0; seg < nr_segs; seg++) { | |
1500 | const struct iovec *iv = &iov[seg]; | |
1501 | ||
1502 | /* | |
1503 | * If any segment has a negative length, or the cumulative | |
1504 | * length ever wraps negative then return -EINVAL. | |
1505 | */ | |
1506 | count += iv->iov_len; | |
1507 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
1508 | return -EINVAL; | |
1509 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
1510 | continue; | |
1511 | if (seg == 0) | |
1512 | return -EFAULT; | |
1513 | nr_segs = seg; | |
1514 | count -= iv->iov_len; /* This segment is no good */ | |
1515 | break; | |
1516 | } | |
1517 | retval = 0; | |
1518 | if (count) { | |
1519 | for (seg = 0; seg < nr_segs; seg++) { | |
1520 | read_descriptor_t desc; | |
1521 | ||
1522 | desc.written = 0; | |
1523 | desc.arg.buf = iov[seg].iov_base; | |
1524 | desc.count = iov[seg].iov_len; | |
1525 | if (desc.count == 0) | |
1526 | continue; | |
1527 | desc.error = 0; | |
1528 | do_generic_file_read(filp, ppos, &desc, | |
1529 | btrfs_read_actor); | |
1530 | retval += desc.written; | |
1531 | if (desc.error) { | |
1532 | retval = retval ?: desc.error; | |
1533 | break; | |
1534 | } | |
1535 | } | |
1536 | } | |
1537 | return retval; | |
1538 | } | |
1539 | ||
2c90e5d6 CM |
1540 | static struct kmem_cache *btrfs_inode_cachep; |
1541 | struct kmem_cache *btrfs_trans_handle_cachep; | |
1542 | struct kmem_cache *btrfs_transaction_cachep; | |
1543 | struct kmem_cache *btrfs_bit_radix_cachep; | |
1544 | struct kmem_cache *btrfs_path_cachep; | |
1545 | ||
1546 | /* | |
1547 | * Called inside transaction, so use GFP_NOFS | |
1548 | */ | |
1549 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
1550 | { | |
1551 | struct btrfs_inode *ei; | |
1552 | ||
1553 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
1554 | if (!ei) | |
1555 | return NULL; | |
1556 | ei->magic = 0xDEADBEEF; | |
1557 | ei->magic2 = 0xDEADBEAF; | |
1558 | return &ei->vfs_inode; | |
1559 | } | |
1560 | ||
1561 | static void btrfs_destroy_inode(struct inode *inode) | |
1562 | { | |
1563 | struct btrfs_inode *ei = BTRFS_I(inode); | |
1564 | WARN_ON(ei->magic != 0xDEADBEEF); | |
1565 | WARN_ON(ei->magic2 != 0xDEADBEAF); | |
1566 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2c90e5d6 CM |
1567 | WARN_ON(inode->i_data.nrpages); |
1568 | ||
1569 | ei->magic = 0; | |
1570 | ei->magic2 = 0; | |
1571 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
1572 | } | |
1573 | ||
1574 | static void init_once(void * foo, struct kmem_cache * cachep, | |
1575 | unsigned long flags) | |
1576 | { | |
1577 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
1578 | ||
1579 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
1580 | SLAB_CTOR_CONSTRUCTOR) { | |
1581 | inode_init_once(&ei->vfs_inode); | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | static int init_inodecache(void) | |
1586 | { | |
1587 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
1588 | sizeof(struct btrfs_inode), | |
1589 | 0, (SLAB_RECLAIM_ACCOUNT| | |
1590 | SLAB_MEM_SPREAD), | |
1591 | init_once, NULL); | |
1592 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
1593 | sizeof(struct btrfs_trans_handle), | |
1594 | 0, (SLAB_RECLAIM_ACCOUNT| | |
1595 | SLAB_MEM_SPREAD), | |
1596 | NULL, NULL); | |
1597 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
1598 | sizeof(struct btrfs_transaction), | |
1599 | 0, (SLAB_RECLAIM_ACCOUNT| | |
1600 | SLAB_MEM_SPREAD), | |
1601 | NULL, NULL); | |
1602 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
1603 | sizeof(struct btrfs_transaction), | |
1604 | 0, (SLAB_RECLAIM_ACCOUNT| | |
1605 | SLAB_MEM_SPREAD), | |
1606 | NULL, NULL); | |
1607 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
1608 | 256, | |
1609 | 0, (SLAB_RECLAIM_ACCOUNT| | |
1610 | SLAB_MEM_SPREAD | | |
1611 | SLAB_DESTROY_BY_RCU), | |
1612 | NULL, NULL); | |
1613 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
1614 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
1615 | return -ENOMEM; | |
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static void destroy_inodecache(void) | |
1620 | { | |
1621 | kmem_cache_destroy(btrfs_inode_cachep); | |
1622 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
1623 | kmem_cache_destroy(btrfs_transaction_cachep); | |
1624 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
1625 | kmem_cache_destroy(btrfs_path_cachep); | |
1626 | } | |
1627 | ||
2e635a27 CM |
1628 | static int btrfs_get_sb(struct file_system_type *fs_type, |
1629 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1630 | { | |
1631 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
1632 | btrfs_fill_super, mnt); | |
1633 | } | |
1634 | ||
1635 | static struct file_system_type btrfs_fs_type = { | |
1636 | .owner = THIS_MODULE, | |
1637 | .name = "btrfs", | |
1638 | .get_sb = btrfs_get_sb, | |
1639 | .kill_sb = kill_block_super, | |
1640 | .fs_flags = FS_REQUIRES_DEV, | |
1641 | }; | |
1642 | ||
e20d96d6 CM |
1643 | static struct super_operations btrfs_super_ops = { |
1644 | .statfs = simple_statfs, | |
134e9731 | 1645 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
1646 | .put_super = btrfs_put_super, |
1647 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
1648 | .write_super = btrfs_write_super, |
1649 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 1650 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
1651 | .alloc_inode = btrfs_alloc_inode, |
1652 | .destroy_inode = btrfs_destroy_inode, | |
e20d96d6 CM |
1653 | }; |
1654 | ||
1655 | static struct inode_operations btrfs_dir_inode_operations = { | |
1656 | .lookup = btrfs_lookup, | |
d5719762 | 1657 | .create = btrfs_create, |
134e9731 | 1658 | .unlink = btrfs_unlink, |
f7922033 | 1659 | .mkdir = btrfs_mkdir, |
5f443fd2 | 1660 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
1661 | }; |
1662 | ||
1663 | static struct file_operations btrfs_dir_file_operations = { | |
1664 | .llseek = generic_file_llseek, | |
1665 | .read = generic_read_dir, | |
1666 | .readdir = btrfs_readdir, | |
1667 | }; | |
1668 | ||
dee26a9f CM |
1669 | static struct address_space_operations btrfs_aops = { |
1670 | .readpage = btrfs_readpage, | |
e8f05c45 | 1671 | .readpages = btrfs_readpages, |
dee26a9f CM |
1672 | .writepage = btrfs_writepage, |
1673 | .sync_page = block_sync_page, | |
1674 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 1675 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
1676 | }; |
1677 | ||
1678 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 1679 | .truncate = btrfs_truncate, |
dee26a9f CM |
1680 | }; |
1681 | ||
1682 | static struct file_operations btrfs_file_operations = { | |
1683 | .llseek = generic_file_llseek, | |
1684 | .read = do_sync_read, | |
e8f05c45 CM |
1685 | .aio_read = btrfs_file_aio_read, |
1686 | .write = btrfs_file_write, | |
dee26a9f CM |
1687 | .mmap = generic_file_mmap, |
1688 | .open = generic_file_open, | |
dee26a9f | 1689 | }; |
e20d96d6 | 1690 | |
2e635a27 CM |
1691 | static int __init init_btrfs_fs(void) |
1692 | { | |
2c90e5d6 | 1693 | int err; |
2e635a27 | 1694 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
1695 | err = init_inodecache(); |
1696 | if (err) | |
1697 | return err; | |
2e635a27 CM |
1698 | return register_filesystem(&btrfs_fs_type); |
1699 | } | |
1700 | ||
1701 | static void __exit exit_btrfs_fs(void) | |
1702 | { | |
2c90e5d6 | 1703 | destroy_inodecache(); |
2e635a27 CM |
1704 | unregister_filesystem(&btrfs_fs_type); |
1705 | printk("btrfs unloaded\n"); | |
1706 | } | |
1707 | ||
1708 | module_init(init_btrfs_fs) | |
1709 | module_exit(exit_btrfs_fs) | |
1710 | ||
1711 | MODULE_LICENSE("GPL"); |