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" |
c5739bba | 18 | #include "ioctl.h" |
2e635a27 | 19 | |
d6e4a428 CM |
20 | void btrfs_fsinfo_release(struct kobject *obj) |
21 | { | |
22 | struct btrfs_fs_info *fsinfo = container_of(obj, | |
23 | struct btrfs_fs_info, kobj); | |
24 | kfree(fsinfo); | |
25 | } | |
26 | ||
27 | struct kobj_type btrfs_fsinfo_ktype = { | |
28 | .release = btrfs_fsinfo_release, | |
29 | }; | |
30 | ||
c5739bba CM |
31 | struct btrfs_iget_args { |
32 | u64 ino; | |
33 | struct btrfs_root *root; | |
34 | }; | |
35 | ||
d6e4a428 CM |
36 | decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL); |
37 | ||
2e635a27 | 38 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
39 | |
40 | static struct inode_operations btrfs_dir_inode_operations; | |
d6e4a428 | 41 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
42 | static struct super_operations btrfs_super_ops; |
43 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
44 | static struct inode_operations btrfs_file_inode_operations; |
45 | static struct address_space_operations btrfs_aops; | |
46 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 47 | |
e20d96d6 | 48 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 49 | { |
5caf2a00 | 50 | struct btrfs_path *path; |
e20d96d6 | 51 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
52 | struct btrfs_root *root = BTRFS_I(inode)->root; |
53 | struct btrfs_key location; | |
e20d96d6 | 54 | int ret; |
f4b9aa8d | 55 | |
5caf2a00 CM |
56 | path = btrfs_alloc_path(); |
57 | BUG_ON(!path); | |
58 | btrfs_init_path(path); | |
f4b9aa8d CM |
59 | mutex_lock(&root->fs_info->fs_mutex); |
60 | ||
d6e4a428 CM |
61 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
62 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 63 | if (ret) { |
7cfcc17e | 64 | btrfs_free_path(path); |
d6e4a428 | 65 | goto make_bad; |
e20d96d6 | 66 | } |
5caf2a00 CM |
67 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
68 | path->slots[0], | |
e20d96d6 | 69 | struct btrfs_inode_item); |
2e635a27 | 70 | |
e20d96d6 CM |
71 | inode->i_mode = btrfs_inode_mode(inode_item); |
72 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
73 | inode->i_uid = btrfs_inode_uid(inode_item); | |
74 | inode->i_gid = btrfs_inode_gid(inode_item); | |
75 | inode->i_size = btrfs_inode_size(inode_item); | |
76 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
77 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
78 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
79 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
80 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
81 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
82 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
83 | inode->i_generation = btrfs_inode_generation(inode_item); | |
5caf2a00 | 84 | |
5caf2a00 CM |
85 | btrfs_free_path(path); |
86 | inode_item = NULL; | |
87 | ||
f4b9aa8d | 88 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 89 | |
e20d96d6 CM |
90 | switch (inode->i_mode & S_IFMT) { |
91 | #if 0 | |
92 | default: | |
93 | init_special_inode(inode, inode->i_mode, | |
94 | btrfs_inode_rdev(inode_item)); | |
95 | break; | |
96 | #endif | |
97 | case S_IFREG: | |
dee26a9f CM |
98 | inode->i_mapping->a_ops = &btrfs_aops; |
99 | inode->i_fop = &btrfs_file_operations; | |
100 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
101 | break; |
102 | case S_IFDIR: | |
e20d96d6 | 103 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
104 | if (root == root->fs_info->tree_root) |
105 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
106 | else | |
107 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
108 | break; |
109 | case S_IFLNK: | |
e20d96d6 CM |
110 | // inode->i_op = &page_symlink_inode_operations; |
111 | break; | |
2e635a27 | 112 | } |
e20d96d6 | 113 | return; |
d6e4a428 CM |
114 | |
115 | make_bad: | |
116 | btrfs_release_path(root, path); | |
117 | btrfs_free_path(path); | |
118 | mutex_unlock(&root->fs_info->fs_mutex); | |
119 | make_bad_inode(inode); | |
2e635a27 CM |
120 | } |
121 | ||
5f443fd2 CM |
122 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
123 | struct btrfs_root *root, | |
124 | struct inode *dir, | |
125 | struct dentry *dentry) | |
134e9731 | 126 | { |
5caf2a00 | 127 | struct btrfs_path *path; |
134e9731 CM |
128 | const char *name = dentry->d_name.name; |
129 | int name_len = dentry->d_name.len; | |
7e38180e | 130 | int ret = 0; |
134e9731 CM |
131 | u64 objectid; |
132 | struct btrfs_dir_item *di; | |
133 | ||
5caf2a00 CM |
134 | path = btrfs_alloc_path(); |
135 | BUG_ON(!path); | |
136 | btrfs_init_path(path); | |
7e38180e | 137 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 138 | name, name_len, -1); |
7e38180e CM |
139 | if (IS_ERR(di)) { |
140 | ret = PTR_ERR(di); | |
134e9731 | 141 | goto err; |
7e38180e CM |
142 | } |
143 | if (!di) { | |
134e9731 CM |
144 | ret = -ENOENT; |
145 | goto err; | |
146 | } | |
d6e4a428 | 147 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
148 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
149 | BUG_ON(ret); | |
150 | btrfs_release_path(root, path); | |
134e9731 | 151 | |
7e38180e CM |
152 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
153 | objectid, name, name_len, -1); | |
154 | if (IS_ERR(di)) { | |
155 | ret = PTR_ERR(di); | |
156 | goto err; | |
157 | } | |
158 | if (!di) { | |
159 | ret = -ENOENT; | |
160 | goto err; | |
161 | } | |
162 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
163 | BUG_ON(ret); |
164 | ||
134e9731 CM |
165 | dentry->d_inode->i_ctime = dir->i_ctime; |
166 | err: | |
5caf2a00 | 167 | btrfs_free_path(path); |
d4dbff95 | 168 | if (ret == 0) { |
134e9731 | 169 | inode_dec_link_count(dentry->d_inode); |
5f26f772 | 170 | dir->i_size -= name_len * 2; |
d4dbff95 CM |
171 | mark_inode_dirty(dir); |
172 | } | |
134e9731 CM |
173 | return ret; |
174 | } | |
175 | ||
5f443fd2 CM |
176 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
177 | { | |
178 | struct btrfs_root *root; | |
179 | struct btrfs_trans_handle *trans; | |
180 | int ret; | |
181 | ||
d6e4a428 | 182 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
183 | mutex_lock(&root->fs_info->fs_mutex); |
184 | trans = btrfs_start_transaction(root, 1); | |
185 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
186 | btrfs_end_transaction(trans, root); | |
187 | mutex_unlock(&root->fs_info->fs_mutex); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
192 | { | |
193 | struct inode *inode = dentry->d_inode; | |
194 | int err; | |
195 | int ret; | |
d6e4a428 | 196 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 197 | struct btrfs_path *path; |
5f443fd2 CM |
198 | struct btrfs_key key; |
199 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
200 | struct btrfs_key found_key; |
201 | int found_type; | |
5f443fd2 | 202 | struct btrfs_leaf *leaf; |
5f26f772 | 203 | char *goodnames = ".."; |
5f443fd2 | 204 | |
5caf2a00 CM |
205 | path = btrfs_alloc_path(); |
206 | BUG_ON(!path); | |
207 | btrfs_init_path(path); | |
5f443fd2 CM |
208 | mutex_lock(&root->fs_info->fs_mutex); |
209 | trans = btrfs_start_transaction(root, 1); | |
210 | key.objectid = inode->i_ino; | |
211 | key.offset = (u64)-1; | |
5f26f772 CM |
212 | key.flags = (u32)-1; |
213 | while(1) { | |
214 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
215 | if (ret < 0) { | |
216 | err = ret; | |
217 | goto out; | |
218 | } | |
219 | BUG_ON(ret == 0); | |
220 | if (path->slots[0] == 0) { | |
221 | err = -ENOENT; | |
222 | goto out; | |
223 | } | |
224 | path->slots[0]--; | |
225 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
226 | btrfs_disk_key_to_cpu(&found_key, | |
227 | &leaf->items[path->slots[0]].key); | |
228 | found_type = btrfs_key_type(&found_key); | |
229 | if (found_key.objectid != inode->i_ino) { | |
230 | err = -ENOENT; | |
231 | goto out; | |
232 | } | |
233 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
234 | found_type != BTRFS_DIR_INDEX_KEY) || | |
235 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
236 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
237 | err = -ENOTEMPTY; | |
238 | goto out; | |
239 | } | |
240 | ret = btrfs_del_item(trans, root, path); | |
241 | BUG_ON(ret); | |
5f443fd2 | 242 | |
5f26f772 CM |
243 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
244 | break; | |
245 | btrfs_release_path(root, path); | |
5f443fd2 | 246 | } |
5f26f772 | 247 | ret = 0; |
5caf2a00 | 248 | btrfs_release_path(root, path); |
5f443fd2 CM |
249 | |
250 | /* now the directory is empty */ | |
251 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
252 | if (!err) { | |
253 | inode->i_size = 0; | |
254 | } | |
255 | out: | |
7cfcc17e CM |
256 | btrfs_release_path(root, path); |
257 | btrfs_free_path(path); | |
5f443fd2 CM |
258 | mutex_unlock(&root->fs_info->fs_mutex); |
259 | ret = btrfs_end_transaction(trans, root); | |
260 | if (ret && !err) | |
261 | err = ret; | |
262 | return err; | |
263 | } | |
264 | ||
134e9731 CM |
265 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
266 | struct btrfs_root *root, | |
267 | struct inode *inode) | |
268 | { | |
5caf2a00 | 269 | struct btrfs_path *path; |
134e9731 | 270 | int ret; |
5caf2a00 | 271 | |
134e9731 | 272 | clear_inode(inode); |
5caf2a00 CM |
273 | |
274 | path = btrfs_alloc_path(); | |
275 | BUG_ON(!path); | |
276 | btrfs_init_path(path); | |
d6e4a428 CM |
277 | ret = btrfs_lookup_inode(trans, root, path, |
278 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 279 | BUG_ON(ret); |
5caf2a00 | 280 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 281 | BUG_ON(ret); |
5caf2a00 | 282 | btrfs_free_path(path); |
134e9731 CM |
283 | return ret; |
284 | } | |
285 | ||
f4b9aa8d CM |
286 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
287 | struct btrfs_root *root, | |
288 | struct inode *inode) | |
289 | { | |
290 | int ret; | |
5caf2a00 | 291 | struct btrfs_path *path; |
f4b9aa8d CM |
292 | struct btrfs_key key; |
293 | struct btrfs_disk_key *found_key; | |
294 | struct btrfs_leaf *leaf; | |
f254e52c CM |
295 | struct btrfs_file_extent_item *fi = NULL; |
296 | u64 extent_start = 0; | |
297 | u64 extent_num_blocks = 0; | |
298 | int found_extent; | |
f4b9aa8d | 299 | |
5caf2a00 CM |
300 | path = btrfs_alloc_path(); |
301 | BUG_ON(!path); | |
f4b9aa8d CM |
302 | /* FIXME, add redo link to tree so we don't leak on crash */ |
303 | key.objectid = inode->i_ino; | |
304 | key.offset = (u64)-1; | |
305 | key.flags = 0; | |
d4dbff95 CM |
306 | /* |
307 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
308 | * or extent data | |
309 | */ | |
f254e52c | 310 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 311 | while(1) { |
5caf2a00 CM |
312 | btrfs_init_path(path); |
313 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 314 | if (ret < 0) { |
f4b9aa8d CM |
315 | goto error; |
316 | } | |
317 | if (ret > 0) { | |
5caf2a00 CM |
318 | BUG_ON(path->slots[0] == 0); |
319 | path->slots[0]--; | |
f4b9aa8d | 320 | } |
5caf2a00 CM |
321 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
322 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
323 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
324 | break; | |
f254e52c | 325 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
d4dbff95 | 326 | btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY && |
f254e52c | 327 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
f4b9aa8d | 328 | break; |
f4b9aa8d CM |
329 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
330 | break; | |
236454df | 331 | found_extent = 0; |
f254e52c | 332 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
333 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
334 | path->slots[0], | |
f254e52c | 335 | struct btrfs_file_extent_item); |
236454df CM |
336 | if (btrfs_file_extent_type(fi) != |
337 | BTRFS_FILE_EXTENT_INLINE) { | |
338 | extent_start = | |
339 | btrfs_file_extent_disk_blocknr(fi); | |
340 | extent_num_blocks = | |
341 | btrfs_file_extent_disk_num_blocks(fi); | |
342 | /* FIXME blocksize != 4096 */ | |
343 | inode->i_blocks -= | |
344 | btrfs_file_extent_num_blocks(fi) << 3; | |
345 | found_extent = 1; | |
346 | } | |
f254e52c | 347 | } |
5caf2a00 | 348 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 349 | BUG_ON(ret); |
5caf2a00 | 350 | btrfs_release_path(root, path); |
f254e52c CM |
351 | if (found_extent) { |
352 | ret = btrfs_free_extent(trans, root, extent_start, | |
353 | extent_num_blocks, 0); | |
354 | BUG_ON(ret); | |
355 | } | |
f4b9aa8d | 356 | } |
f4b9aa8d CM |
357 | ret = 0; |
358 | error: | |
5caf2a00 CM |
359 | btrfs_release_path(root, path); |
360 | btrfs_free_path(path); | |
f4b9aa8d CM |
361 | return ret; |
362 | } | |
363 | ||
134e9731 CM |
364 | static void btrfs_delete_inode(struct inode *inode) |
365 | { | |
366 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 367 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
368 | int ret; |
369 | ||
134e9731 CM |
370 | truncate_inode_pages(&inode->i_data, 0); |
371 | if (is_bad_inode(inode)) { | |
372 | goto no_delete; | |
373 | } | |
374 | inode->i_size = 0; | |
134e9731 CM |
375 | mutex_lock(&root->fs_info->fs_mutex); |
376 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
377 | if (S_ISREG(inode->i_mode)) { |
378 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
379 | BUG_ON(ret); | |
380 | } | |
134e9731 CM |
381 | btrfs_free_inode(trans, root, inode); |
382 | btrfs_end_transaction(trans, root); | |
383 | mutex_unlock(&root->fs_info->fs_mutex); | |
384 | return; | |
385 | no_delete: | |
386 | clear_inode(inode); | |
387 | } | |
388 | ||
e20d96d6 | 389 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 390 | struct btrfs_key *location) |
e20d96d6 CM |
391 | { |
392 | const char *name = dentry->d_name.name; | |
393 | int namelen = dentry->d_name.len; | |
394 | struct btrfs_dir_item *di; | |
5caf2a00 | 395 | struct btrfs_path *path; |
d6e4a428 | 396 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
397 | int ret; |
398 | ||
5caf2a00 CM |
399 | path = btrfs_alloc_path(); |
400 | BUG_ON(!path); | |
401 | btrfs_init_path(path); | |
7e38180e | 402 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 403 | namelen, 0); |
7e38180e | 404 | if (!di || IS_ERR(di)) { |
d6e4a428 | 405 | location->objectid = 0; |
2c90e5d6 | 406 | ret = 0; |
e20d96d6 CM |
407 | goto out; |
408 | } | |
d6e4a428 | 409 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 410 | out: |
5caf2a00 CM |
411 | btrfs_release_path(root, path); |
412 | btrfs_free_path(path); | |
e20d96d6 CM |
413 | return ret; |
414 | } | |
415 | ||
d6e4a428 CM |
416 | int fixup_tree_root_location(struct btrfs_root *root, |
417 | struct btrfs_key *location, | |
418 | struct btrfs_root **sub_root) | |
419 | { | |
420 | struct btrfs_path *path; | |
421 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
422 | |
423 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
424 | return 0; | |
425 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
426 | return 0; | |
427 | ||
428 | path = btrfs_alloc_path(); | |
429 | BUG_ON(!path); | |
430 | mutex_lock(&root->fs_info->fs_mutex); | |
431 | ||
0f7d52f4 CM |
432 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
433 | if (IS_ERR(*sub_root)) | |
434 | return PTR_ERR(*sub_root); | |
435 | ||
436 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
437 | location->objectid = btrfs_root_dirid(ri); |
438 | location->flags = 0; | |
439 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
440 | location->offset = 0; | |
0f7d52f4 | 441 | |
d6e4a428 CM |
442 | btrfs_free_path(path); |
443 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 444 | return 0; |
d6e4a428 CM |
445 | } |
446 | ||
c5739bba CM |
447 | int btrfs_init_locked_inode(struct inode *inode, void *p) |
448 | { | |
449 | struct btrfs_iget_args *args = p; | |
450 | inode->i_ino = args->ino; | |
451 | BTRFS_I(inode)->root = args->root; | |
452 | return 0; | |
453 | } | |
454 | ||
455 | int btrfs_find_actor(struct inode *inode, void *opaque) | |
456 | { | |
457 | struct btrfs_iget_args *args = opaque; | |
458 | return (args->ino == inode->i_ino && | |
459 | args->root == BTRFS_I(inode)->root); | |
460 | } | |
461 | ||
462 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
463 | struct btrfs_root *root) | |
464 | { | |
465 | struct inode *inode; | |
466 | struct btrfs_iget_args args; | |
467 | args.ino = objectid; | |
468 | args.root = root; | |
469 | ||
470 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
471 | btrfs_init_locked_inode, | |
472 | (void *)&args); | |
473 | return inode; | |
474 | } | |
d6e4a428 | 475 | |
e20d96d6 CM |
476 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
477 | struct nameidata *nd) | |
478 | { | |
479 | struct inode * inode; | |
d6e4a428 CM |
480 | struct btrfs_inode *bi = BTRFS_I(dir); |
481 | struct btrfs_root *root = bi->root; | |
482 | struct btrfs_root *sub_root = root; | |
483 | struct btrfs_key location; | |
e20d96d6 CM |
484 | int ret; |
485 | ||
486 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
487 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 488 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 489 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 490 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
491 | if (ret < 0) |
492 | return ERR_PTR(ret); | |
493 | inode = NULL; | |
d6e4a428 CM |
494 | if (location.objectid) { |
495 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
496 | if (ret < 0) | |
497 | return ERR_PTR(ret); | |
498 | if (ret > 0) | |
499 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
500 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
501 | sub_root); | |
e20d96d6 CM |
502 | if (!inode) |
503 | return ERR_PTR(-EACCES); | |
d6e4a428 | 504 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 505 | if (sub_root != root) { |
c5739bba | 506 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
507 | igrab(inode); |
508 | sub_root->inode = inode; | |
509 | } | |
d6e4a428 CM |
510 | BTRFS_I(inode)->root = sub_root; |
511 | memcpy(&BTRFS_I(inode)->location, &location, | |
512 | sizeof(location)); | |
513 | btrfs_read_locked_inode(inode); | |
514 | unlock_new_inode(inode); | |
515 | } | |
e20d96d6 CM |
516 | } |
517 | return d_splice_alias(inode, dentry); | |
518 | } | |
519 | ||
520 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
521 | { | |
522 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 523 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
524 | struct btrfs_item *item; |
525 | struct btrfs_dir_item *di; | |
526 | struct btrfs_key key; | |
5caf2a00 | 527 | struct btrfs_path *path; |
e20d96d6 CM |
528 | int ret; |
529 | u32 nritems; | |
530 | struct btrfs_leaf *leaf; | |
531 | int slot; | |
532 | int advance; | |
533 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 534 | int over = 0; |
7e38180e CM |
535 | u32 di_cur; |
536 | u32 di_total; | |
537 | u32 di_len; | |
538 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
539 | |
540 | /* FIXME, use a real flag for deciding about the key type */ | |
541 | if (root->fs_info->tree_root == root) | |
542 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 543 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 544 | key.objectid = inode->i_ino; |
e20d96d6 | 545 | key.flags = 0; |
d6e4a428 | 546 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 547 | key.offset = filp->f_pos; |
5caf2a00 CM |
548 | path = btrfs_alloc_path(); |
549 | btrfs_init_path(path); | |
550 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 551 | if (ret < 0) |
e20d96d6 | 552 | goto err; |
7f5c1516 | 553 | advance = 0; |
e20d96d6 | 554 | while(1) { |
5caf2a00 | 555 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 556 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 557 | slot = path->slots[0]; |
dee26a9f CM |
558 | if (advance || slot >= nritems) { |
559 | if (slot >= nritems -1) { | |
5caf2a00 | 560 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
561 | if (ret) |
562 | break; | |
5caf2a00 | 563 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 564 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 565 | slot = path->slots[0]; |
e20d96d6 CM |
566 | } else { |
567 | slot++; | |
5caf2a00 | 568 | path->slots[0]++; |
e20d96d6 CM |
569 | } |
570 | } | |
571 | advance = 1; | |
572 | item = leaf->items + slot; | |
e20d96d6 CM |
573 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
574 | break; | |
d6e4a428 | 575 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 576 | break; |
7f5c1516 CM |
577 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
578 | continue; | |
7fcde0e3 | 579 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 580 | advance = 1; |
e20d96d6 | 581 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
582 | di_cur = 0; |
583 | di_total = btrfs_item_size(leaf->items + slot); | |
584 | while(di_cur < di_total) { | |
585 | over = filldir(dirent, (const char *)(di + 1), | |
586 | btrfs_dir_name_len(di), | |
587 | btrfs_disk_key_offset(&item->key), | |
588 | btrfs_disk_key_objectid(&di->location), | |
589 | d_type); | |
590 | if (over) | |
591 | goto nopos; | |
592 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
593 | di_cur += di_len; | |
594 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
595 | } | |
e20d96d6 | 596 | } |
7fcde0e3 CM |
597 | filp->f_pos++; |
598 | nopos: | |
e20d96d6 CM |
599 | ret = 0; |
600 | err: | |
5caf2a00 CM |
601 | btrfs_release_path(root, path); |
602 | btrfs_free_path(path); | |
22b0ebda | 603 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
604 | return ret; |
605 | } | |
606 | ||
607 | static void btrfs_put_super (struct super_block * sb) | |
608 | { | |
609 | struct btrfs_root *root = btrfs_sb(sb); | |
610 | int ret; | |
611 | ||
612 | ret = close_ctree(root); | |
613 | if (ret) { | |
614 | printk("close ctree returns %d\n", ret); | |
615 | } | |
616 | sb->s_fs_info = NULL; | |
617 | } | |
2e635a27 CM |
618 | |
619 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
620 | { | |
621 | struct inode * inode; | |
e20d96d6 CM |
622 | struct dentry * root_dentry; |
623 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 624 | struct btrfs_root *tree_root; |
d6e4a428 | 625 | struct btrfs_inode *bi; |
2e635a27 CM |
626 | |
627 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 628 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 629 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 630 | sb->s_time_gran = 1; |
e20d96d6 | 631 | |
0f7d52f4 | 632 | tree_root = open_ctree(sb); |
d98237b3 | 633 | |
0f7d52f4 | 634 | if (!tree_root) { |
e20d96d6 CM |
635 | printk("btrfs: open_ctree failed\n"); |
636 | return -EIO; | |
637 | } | |
0f7d52f4 CM |
638 | sb->s_fs_info = tree_root; |
639 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
640 | printk("read in super total blocks %Lu root %Lu\n", |
641 | btrfs_super_total_blocks(disk_super), | |
642 | btrfs_super_root_dir(disk_super)); | |
643 | ||
c5739bba CM |
644 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
645 | tree_root); | |
d6e4a428 CM |
646 | bi = BTRFS_I(inode); |
647 | bi->location.objectid = inode->i_ino; | |
648 | bi->location.offset = 0; | |
649 | bi->location.flags = 0; | |
0f7d52f4 | 650 | bi->root = tree_root; |
d6e4a428 CM |
651 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
652 | ||
2e635a27 CM |
653 | if (!inode) |
654 | return -ENOMEM; | |
e20d96d6 CM |
655 | if (inode->i_state & I_NEW) { |
656 | btrfs_read_locked_inode(inode); | |
657 | unlock_new_inode(inode); | |
658 | } | |
2e635a27 | 659 | |
e20d96d6 CM |
660 | root_dentry = d_alloc_root(inode); |
661 | if (!root_dentry) { | |
2e635a27 CM |
662 | iput(inode); |
663 | return -ENOMEM; | |
664 | } | |
e20d96d6 CM |
665 | sb->s_root = root_dentry; |
666 | ||
2e635a27 CM |
667 | return 0; |
668 | } | |
669 | ||
d5719762 CM |
670 | static void fill_inode_item(struct btrfs_inode_item *item, |
671 | struct inode *inode) | |
672 | { | |
673 | btrfs_set_inode_uid(item, inode->i_uid); | |
674 | btrfs_set_inode_gid(item, inode->i_gid); | |
675 | btrfs_set_inode_size(item, inode->i_size); | |
676 | btrfs_set_inode_mode(item, inode->i_mode); | |
677 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
678 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
679 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
680 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
681 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
682 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
683 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
684 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
685 | btrfs_set_inode_generation(item, inode->i_generation); | |
686 | } | |
687 | ||
4730a4bc CM |
688 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
689 | struct btrfs_root *root, | |
690 | struct inode *inode) | |
691 | { | |
692 | struct btrfs_inode_item *inode_item; | |
5caf2a00 | 693 | struct btrfs_path *path; |
4730a4bc CM |
694 | int ret; |
695 | ||
5caf2a00 CM |
696 | path = btrfs_alloc_path(); |
697 | BUG_ON(!path); | |
698 | btrfs_init_path(path); | |
d6e4a428 CM |
699 | ret = btrfs_lookup_inode(trans, root, path, |
700 | &BTRFS_I(inode)->location, 1); | |
4730a4bc CM |
701 | if (ret) { |
702 | if (ret > 0) | |
703 | ret = -ENOENT; | |
704 | goto failed; | |
705 | } | |
706 | ||
5caf2a00 CM |
707 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
708 | path->slots[0], | |
4730a4bc CM |
709 | struct btrfs_inode_item); |
710 | ||
711 | fill_inode_item(inode_item, inode); | |
5caf2a00 | 712 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1b05da2e | 713 | ret = 0; |
4730a4bc | 714 | failed: |
5caf2a00 CM |
715 | btrfs_release_path(root, path); |
716 | btrfs_free_path(path); | |
1b05da2e | 717 | return ret; |
4730a4bc CM |
718 | } |
719 | ||
720 | static int btrfs_write_inode(struct inode *inode, int wait) | |
721 | { | |
d6e4a428 | 722 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc CM |
723 | struct btrfs_trans_handle *trans; |
724 | int ret; | |
725 | ||
726 | mutex_lock(&root->fs_info->fs_mutex); | |
727 | trans = btrfs_start_transaction(root, 1); | |
728 | ret = btrfs_update_inode(trans, root, inode); | |
729 | if (wait) | |
730 | btrfs_commit_transaction(trans, root); | |
731 | else | |
732 | btrfs_end_transaction(trans, root); | |
733 | mutex_unlock(&root->fs_info->fs_mutex); | |
734 | return ret; | |
735 | } | |
736 | ||
d5719762 | 737 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f CM |
738 | struct btrfs_root *root, |
739 | u64 objectid, int mode) | |
d5719762 CM |
740 | { |
741 | struct inode *inode; | |
742 | struct btrfs_inode_item inode_item; | |
1b05da2e | 743 | struct btrfs_key *location; |
d5719762 | 744 | int ret; |
d5719762 | 745 | |
2619ba1f | 746 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
747 | if (!inode) |
748 | return ERR_PTR(-ENOMEM); | |
749 | ||
2619ba1f | 750 | BTRFS_I(inode)->root = root; |
d5719762 CM |
751 | |
752 | inode->i_uid = current->fsuid; | |
753 | inode->i_gid = current->fsgid; | |
754 | inode->i_mode = mode; | |
755 | inode->i_ino = objectid; | |
756 | inode->i_blocks = 0; | |
c5739bba | 757 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 758 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
759 | location = &BTRFS_I(inode)->location; |
760 | location->objectid = objectid; | |
761 | location->flags = 0; | |
762 | location->offset = 0; | |
763 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
764 | |
765 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
766 | BUG_ON(ret); | |
767 | ||
768 | insert_inode_hash(inode); | |
d5719762 CM |
769 | return inode; |
770 | } | |
771 | ||
772 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
773 | struct dentry *dentry, struct inode *inode) | |
774 | { | |
775 | int ret; | |
d6e4a428 CM |
776 | struct btrfs_key key; |
777 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
778 | key.objectid = inode->i_ino; | |
779 | key.flags = 0; | |
780 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
781 | key.offset = 0; | |
782 | ||
783 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
784 | dentry->d_name.name, dentry->d_name.len, |
785 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 786 | &key, 0); |
4730a4bc | 787 | if (ret == 0) { |
5f26f772 | 788 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 789 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
790 | dentry->d_parent->d_inode); |
791 | } | |
d5719762 CM |
792 | return ret; |
793 | } | |
794 | ||
795 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
796 | struct dentry *dentry, struct inode *inode) | |
797 | { | |
798 | int err = btrfs_add_link(trans, dentry, inode); | |
799 | if (!err) { | |
800 | d_instantiate(dentry, inode); | |
801 | return 0; | |
802 | } | |
2c90e5d6 CM |
803 | if (err > 0) |
804 | err = -EEXIST; | |
d5719762 CM |
805 | return err; |
806 | } | |
807 | ||
808 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
809 | int mode, struct nameidata *nd) | |
810 | { | |
811 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 812 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
813 | struct inode *inode; |
814 | int err; | |
134e9731 | 815 | int drop_inode = 0; |
2619ba1f | 816 | u64 objectid; |
d5719762 | 817 | |
d561c025 | 818 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 819 | trans = btrfs_start_transaction(root, 1); |
2619ba1f CM |
820 | |
821 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
822 | if (err) { | |
823 | err = -ENOSPC; | |
824 | goto out_unlock; | |
825 | } | |
826 | ||
827 | inode = btrfs_new_inode(trans, root, objectid, mode); | |
d5719762 CM |
828 | err = PTR_ERR(inode); |
829 | if (IS_ERR(inode)) | |
d561c025 | 830 | goto out_unlock; |
d5719762 CM |
831 | // FIXME mark the inode dirty |
832 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
833 | if (err) |
834 | drop_inode = 1; | |
dee26a9f CM |
835 | else { |
836 | inode->i_mapping->a_ops = &btrfs_aops; | |
837 | inode->i_fop = &btrfs_file_operations; | |
838 | inode->i_op = &btrfs_file_inode_operations; | |
839 | } | |
d5719762 | 840 | dir->i_sb->s_dirt = 1; |
d561c025 | 841 | out_unlock: |
22b0ebda | 842 | btrfs_end_transaction(trans, root); |
d561c025 | 843 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 844 | |
134e9731 CM |
845 | if (drop_inode) { |
846 | inode_dec_link_count(inode); | |
847 | iput(inode); | |
848 | } | |
d5719762 CM |
849 | return err; |
850 | } | |
851 | ||
f7922033 | 852 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
853 | struct btrfs_root *root, |
854 | u64 objectid, u64 dirid) | |
f7922033 | 855 | { |
f7922033 CM |
856 | int ret; |
857 | char buf[2]; | |
d6e4a428 CM |
858 | struct btrfs_key key; |
859 | ||
f7922033 CM |
860 | buf[0] = '.'; |
861 | buf[1] = '.'; | |
862 | ||
2619ba1f | 863 | key.objectid = objectid; |
d6e4a428 CM |
864 | key.offset = 0; |
865 | key.flags = 0; | |
866 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
867 | ||
2619ba1f | 868 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 869 | &key, 1); |
f7922033 CM |
870 | if (ret) |
871 | goto error; | |
2619ba1f CM |
872 | key.objectid = dirid; |
873 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 874 | &key, 1); |
4730a4bc CM |
875 | if (ret) |
876 | goto error; | |
f7922033 CM |
877 | error: |
878 | return ret; | |
879 | } | |
880 | ||
881 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
882 | { | |
883 | struct inode *inode; | |
884 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 885 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
886 | int err = 0; |
887 | int drop_on_err = 0; | |
2619ba1f | 888 | u64 objectid; |
f7922033 CM |
889 | |
890 | mutex_lock(&root->fs_info->fs_mutex); | |
891 | trans = btrfs_start_transaction(root, 1); | |
892 | if (IS_ERR(trans)) { | |
893 | err = PTR_ERR(trans); | |
894 | goto out_unlock; | |
895 | } | |
2619ba1f CM |
896 | |
897 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
898 | if (err) { | |
899 | err = -ENOSPC; | |
900 | goto out_unlock; | |
901 | } | |
902 | ||
903 | inode = btrfs_new_inode(trans, root, objectid, S_IFDIR | mode); | |
f7922033 CM |
904 | if (IS_ERR(inode)) { |
905 | err = PTR_ERR(inode); | |
906 | goto out_fail; | |
907 | } | |
908 | drop_on_err = 1; | |
909 | inode->i_op = &btrfs_dir_inode_operations; | |
910 | inode->i_fop = &btrfs_dir_file_operations; | |
911 | ||
2619ba1f CM |
912 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
913 | if (err) | |
914 | goto out_fail; | |
915 | ||
916 | inode->i_size = 6; | |
917 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
918 | if (err) |
919 | goto out_fail; | |
920 | err = btrfs_add_link(trans, dentry, inode); | |
921 | if (err) | |
922 | goto out_fail; | |
923 | d_instantiate(dentry, inode); | |
f7922033 CM |
924 | drop_on_err = 0; |
925 | ||
926 | out_fail: | |
927 | btrfs_end_transaction(trans, root); | |
928 | out_unlock: | |
929 | mutex_unlock(&root->fs_info->fs_mutex); | |
930 | if (drop_on_err) | |
931 | iput(inode); | |
932 | return err; | |
933 | } | |
934 | ||
d5719762 CM |
935 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
936 | { | |
937 | struct btrfs_trans_handle *trans; | |
938 | struct btrfs_root *root; | |
939 | int ret; | |
d98237b3 | 940 | root = btrfs_sb(sb); |
df2ce34c | 941 | |
d5719762 | 942 | sb->s_dirt = 0; |
d561c025 | 943 | if (!wait) { |
7cfcc17e | 944 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
945 | return 0; |
946 | } | |
7cfcc17e | 947 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
d561c025 | 948 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
949 | trans = btrfs_start_transaction(root, 1); |
950 | ret = btrfs_commit_transaction(trans, root); | |
951 | sb->s_dirt = 0; | |
952 | BUG_ON(ret); | |
953 | printk("btrfs sync_fs\n"); | |
d561c025 | 954 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
955 | return 0; |
956 | } | |
957 | ||
75dfe396 | 958 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
959 | struct buffer_head *result, int create) |
960 | { | |
961 | int ret; | |
962 | int err = 0; | |
963 | u64 blocknr; | |
964 | u64 extent_start = 0; | |
965 | u64 extent_end = 0; | |
966 | u64 objectid = inode->i_ino; | |
236454df | 967 | u32 found_type; |
5caf2a00 | 968 | struct btrfs_path *path; |
d6e4a428 | 969 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
970 | struct btrfs_file_extent_item *item; |
971 | struct btrfs_leaf *leaf; | |
972 | struct btrfs_disk_key *found_key; | |
973 | ||
5caf2a00 CM |
974 | path = btrfs_alloc_path(); |
975 | BUG_ON(!path); | |
976 | btrfs_init_path(path); | |
6567e837 | 977 | if (create) { |
6567e837 CM |
978 | WARN_ON(1); |
979 | } | |
dee26a9f | 980 | |
236454df | 981 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 982 | inode->i_ino, |
236454df | 983 | iblock << inode->i_blkbits, 0); |
dee26a9f | 984 | if (ret < 0) { |
dee26a9f CM |
985 | err = ret; |
986 | goto out; | |
987 | } | |
988 | ||
989 | if (ret != 0) { | |
5caf2a00 CM |
990 | if (path->slots[0] == 0) { |
991 | btrfs_release_path(root, path); | |
236454df | 992 | goto out; |
dee26a9f | 993 | } |
5caf2a00 | 994 | path->slots[0]--; |
dee26a9f CM |
995 | } |
996 | ||
5caf2a00 | 997 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 998 | struct btrfs_file_extent_item); |
5caf2a00 | 999 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1000 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1001 | blocknr += btrfs_file_extent_offset(item); | |
1002 | ||
dee26a9f | 1003 | /* are we inside the extent that was found? */ |
5caf2a00 | 1004 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1005 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1006 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1007 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1008 | extent_end = 0; |
1009 | extent_start = 0; | |
5caf2a00 | 1010 | btrfs_release_path(root, path); |
dee26a9f CM |
1011 | goto out; |
1012 | } | |
236454df CM |
1013 | found_type = btrfs_file_extent_type(item); |
1014 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1015 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1016 | extent_start = extent_start >> inode->i_blkbits; | |
1017 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
1018 | if (iblock >= extent_start && iblock < extent_end) { | |
1019 | err = 0; | |
1020 | btrfs_map_bh_to_logical(root, result, blocknr + | |
1021 | iblock - extent_start); | |
1022 | goto out; | |
1023 | } | |
1024 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1025 | char *ptr; | |
1026 | char *map; | |
1027 | u32 size; | |
1028 | size = btrfs_file_extent_inline_len(leaf->items + | |
1029 | path->slots[0]); | |
1030 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1031 | extent_start >>= inode->i_blkbits; | |
1032 | if (iblock < extent_start || iblock > extent_end) { | |
1033 | goto out; | |
1034 | } | |
1035 | ptr = btrfs_file_extent_inline_start(item); | |
1036 | map = kmap(result->b_page); | |
1037 | memcpy(map, ptr, size); | |
1038 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1039 | flush_dcache_page(result->b_page); | |
1040 | kunmap(result->b_page); | |
1041 | set_buffer_uptodate(result); | |
1042 | SetPageChecked(result->b_page); | |
1043 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1044 | } |
dee26a9f | 1045 | out: |
5caf2a00 CM |
1046 | btrfs_release_path(root, path); |
1047 | btrfs_free_path(path); | |
75dfe396 CM |
1048 | return err; |
1049 | } | |
1050 | ||
1051 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1052 | struct buffer_head *result, int create) | |
1053 | { | |
1054 | int err; | |
d6e4a428 | 1055 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1056 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1057 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1058 | mutex_unlock(&root->fs_info->fs_mutex); |
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1063 | unsigned from, unsigned to) | |
1064 | { | |
6407bf6d | 1065 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1066 | } |
1067 | ||
d561c025 CM |
1068 | static void btrfs_write_super(struct super_block *sb) |
1069 | { | |
1070 | btrfs_sync_fs(sb, 1); | |
1071 | } | |
1072 | ||
dee26a9f CM |
1073 | static int btrfs_readpage(struct file *file, struct page *page) |
1074 | { | |
1075 | return mpage_readpage(page, btrfs_get_block); | |
1076 | } | |
1077 | ||
236454df CM |
1078 | /* |
1079 | * While block_write_full_page is writing back the dirty buffers under | |
1080 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1081 | * again at any time. We handle that by only looking at the buffer | |
1082 | * state inside lock_buffer(). | |
1083 | * | |
1084 | * If block_write_full_page() is called for regular writeback | |
1085 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1086 | * locked buffer. This only can happen if someone has written the buffer | |
1087 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1088 | * prevents this contention from occurring. | |
1089 | */ | |
1090 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1091 | struct writeback_control *wbc) | |
1092 | { | |
1093 | int err; | |
1094 | sector_t block; | |
1095 | sector_t last_block; | |
1096 | struct buffer_head *bh, *head; | |
1097 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1098 | int nr_underway = 0; | |
1099 | ||
1100 | BUG_ON(!PageLocked(page)); | |
1101 | ||
1102 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1103 | ||
1104 | if (!page_has_buffers(page)) { | |
1105 | create_empty_buffers(page, blocksize, | |
1106 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1111 | * here, and the (potentially unmapped) buffers may become dirty at | |
1112 | * any time. If a buffer becomes dirty here after we've inspected it | |
1113 | * then we just miss that fact, and the page stays dirty. | |
1114 | * | |
1115 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1116 | * handle that here by just cleaning them. | |
1117 | */ | |
1118 | ||
1119 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1120 | head = page_buffers(page); | |
1121 | bh = head; | |
1122 | ||
1123 | /* | |
1124 | * Get all the dirty buffers mapped to disk addresses and | |
1125 | * handle any aliases from the underlying blockdev's mapping. | |
1126 | */ | |
1127 | do { | |
1128 | if (block > last_block) { | |
1129 | /* | |
1130 | * mapped buffers outside i_size will occur, because | |
1131 | * this page can be outside i_size when there is a | |
1132 | * truncate in progress. | |
1133 | */ | |
1134 | /* | |
1135 | * The buffer was zeroed by block_write_full_page() | |
1136 | */ | |
1137 | clear_buffer_dirty(bh); | |
1138 | set_buffer_uptodate(bh); | |
1139 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1140 | WARN_ON(bh->b_size != blocksize); | |
1141 | err = btrfs_get_block(inode, block, bh, 0); | |
1142 | if (err) | |
1143 | goto recover; | |
1144 | if (buffer_new(bh)) { | |
1145 | /* blockdev mappings never come here */ | |
1146 | clear_buffer_new(bh); | |
1147 | unmap_underlying_metadata(bh->b_bdev, | |
1148 | bh->b_blocknr); | |
1149 | } | |
1150 | } | |
1151 | bh = bh->b_this_page; | |
1152 | block++; | |
1153 | } while (bh != head); | |
1154 | ||
1155 | do { | |
1156 | if (!buffer_mapped(bh)) | |
1157 | continue; | |
1158 | /* | |
1159 | * If it's a fully non-blocking write attempt and we cannot | |
1160 | * lock the buffer then redirty the page. Note that this can | |
1161 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1162 | * activity, but those code paths have their own higher-level | |
1163 | * throttling. | |
1164 | */ | |
1165 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1166 | lock_buffer(bh); | |
1167 | } else if (test_set_buffer_locked(bh)) { | |
1168 | redirty_page_for_writepage(wbc, page); | |
1169 | continue; | |
1170 | } | |
1171 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1172 | mark_buffer_async_write(bh); | |
1173 | } else { | |
1174 | unlock_buffer(bh); | |
1175 | } | |
1176 | } while ((bh = bh->b_this_page) != head); | |
1177 | ||
1178 | /* | |
1179 | * The page and its buffers are protected by PageWriteback(), so we can | |
1180 | * drop the bh refcounts early. | |
1181 | */ | |
1182 | BUG_ON(PageWriteback(page)); | |
1183 | set_page_writeback(page); | |
1184 | ||
1185 | do { | |
1186 | struct buffer_head *next = bh->b_this_page; | |
1187 | if (buffer_async_write(bh)) { | |
1188 | submit_bh(WRITE, bh); | |
1189 | nr_underway++; | |
1190 | } | |
1191 | bh = next; | |
1192 | } while (bh != head); | |
1193 | unlock_page(page); | |
1194 | ||
1195 | err = 0; | |
1196 | done: | |
1197 | if (nr_underway == 0) { | |
1198 | /* | |
1199 | * The page was marked dirty, but the buffers were | |
1200 | * clean. Someone wrote them back by hand with | |
1201 | * ll_rw_block/submit_bh. A rare case. | |
1202 | */ | |
1203 | int uptodate = 1; | |
1204 | do { | |
1205 | if (!buffer_uptodate(bh)) { | |
1206 | uptodate = 0; | |
1207 | break; | |
1208 | } | |
1209 | bh = bh->b_this_page; | |
1210 | } while (bh != head); | |
1211 | if (uptodate) | |
1212 | SetPageUptodate(page); | |
1213 | end_page_writeback(page); | |
1214 | /* | |
1215 | * The page and buffer_heads can be released at any time from | |
1216 | * here on. | |
1217 | */ | |
1218 | wbc->pages_skipped++; /* We didn't write this page */ | |
1219 | } | |
1220 | return err; | |
1221 | ||
1222 | recover: | |
1223 | /* | |
1224 | * ENOSPC, or some other error. We may already have added some | |
1225 | * blocks to the file, so we need to write these out to avoid | |
1226 | * exposing stale data. | |
1227 | * The page is currently locked and not marked for writeback | |
1228 | */ | |
1229 | bh = head; | |
1230 | /* Recovery: lock and submit the mapped buffers */ | |
1231 | do { | |
1232 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1233 | lock_buffer(bh); | |
1234 | mark_buffer_async_write(bh); | |
1235 | } else { | |
1236 | /* | |
1237 | * The buffer may have been set dirty during | |
1238 | * attachment to a dirty page. | |
1239 | */ | |
1240 | clear_buffer_dirty(bh); | |
1241 | } | |
1242 | } while ((bh = bh->b_this_page) != head); | |
1243 | SetPageError(page); | |
1244 | BUG_ON(PageWriteback(page)); | |
1245 | set_page_writeback(page); | |
1246 | do { | |
1247 | struct buffer_head *next = bh->b_this_page; | |
1248 | if (buffer_async_write(bh)) { | |
1249 | clear_buffer_dirty(bh); | |
1250 | submit_bh(WRITE, bh); | |
1251 | nr_underway++; | |
1252 | } | |
1253 | bh = next; | |
1254 | } while (bh != head); | |
1255 | unlock_page(page); | |
1256 | goto done; | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * The generic ->writepage function for buffer-backed address_spaces | |
1261 | */ | |
dee26a9f CM |
1262 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1263 | { | |
236454df CM |
1264 | struct inode * const inode = page->mapping->host; |
1265 | loff_t i_size = i_size_read(inode); | |
1266 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1267 | unsigned offset; | |
1268 | void *kaddr; | |
1269 | ||
1270 | /* Is the page fully inside i_size? */ | |
1271 | if (page->index < end_index) | |
1272 | return __btrfs_write_full_page(inode, page, wbc); | |
1273 | ||
1274 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1275 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1276 | if (page->index >= end_index+1 || !offset) { | |
1277 | /* | |
1278 | * The page may have dirty, unmapped buffers. For example, | |
1279 | * they may have been added in ext3_writepage(). Make them | |
1280 | * freeable here, so the page does not leak. | |
1281 | */ | |
1282 | block_invalidatepage(page, 0); | |
1283 | unlock_page(page); | |
1284 | return 0; /* don't care */ | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * The page straddles i_size. It must be zeroed out on each and every | |
1289 | * writepage invokation because it may be mmapped. "A file is mapped | |
1290 | * in multiples of the page size. For a file that is not a multiple of | |
1291 | * the page size, the remaining memory is zeroed when mapped, and | |
1292 | * writes to that region are not written out to the file." | |
1293 | */ | |
1294 | kaddr = kmap_atomic(page, KM_USER0); | |
1295 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1296 | flush_dcache_page(page); | |
1297 | kunmap_atomic(kaddr, KM_USER0); | |
1298 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1299 | } |
d561c025 | 1300 | |
f4b9aa8d CM |
1301 | static void btrfs_truncate(struct inode *inode) |
1302 | { | |
d6e4a428 | 1303 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1304 | int ret; |
1305 | struct btrfs_trans_handle *trans; | |
1306 | ||
1307 | if (!S_ISREG(inode->i_mode)) | |
1308 | return; | |
1309 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1310 | return; | |
1311 | ||
e8f05c45 | 1312 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1313 | |
1314 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1315 | mutex_lock(&root->fs_info->fs_mutex); | |
1316 | trans = btrfs_start_transaction(root, 1); | |
1317 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
1318 | BUG_ON(ret); | |
1319 | ret = btrfs_end_transaction(trans, root); | |
1320 | BUG_ON(ret); | |
1321 | mutex_unlock(&root->fs_info->fs_mutex); | |
1322 | mark_inode_dirty(inode); | |
1323 | } | |
1324 | ||
236454df CM |
1325 | /* |
1326 | * Make sure any changes to nobh_commit_write() are reflected in | |
1327 | * nobh_truncate_page(), since it doesn't call commit_write(). | |
1328 | */ | |
1329 | static int btrfs_commit_write(struct file *file, struct page *page, | |
1330 | unsigned from, unsigned to) | |
1331 | { | |
1332 | struct inode *inode = page->mapping->host; | |
1333 | struct buffer_head *bh; | |
1334 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1335 | ||
1336 | SetPageUptodate(page); | |
1337 | bh = page_buffers(page); | |
1338 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
1339 | set_page_dirty(page); | |
1340 | } | |
1341 | if (pos > inode->i_size) { | |
1342 | i_size_write(inode, pos); | |
1343 | mark_inode_dirty(inode); | |
1344 | } | |
1345 | return 0; | |
1346 | } | |
1347 | ||
75dfe396 CM |
1348 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1349 | struct page **prepared_pages, | |
1350 | const char __user * buf) | |
1351 | { | |
1352 | long page_fault = 0; | |
1353 | int i; | |
1354 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1355 | ||
1356 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1357 | size_t count = min_t(size_t, | |
1358 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1359 | struct page *page = prepared_pages[i]; | |
1360 | fault_in_pages_readable(buf, count); | |
1361 | ||
1362 | /* Copy data from userspace to the current page */ | |
1363 | kmap(page); | |
1364 | page_fault = __copy_from_user(page_address(page) + offset, | |
1365 | buf, count); | |
1366 | /* Flush processor's dcache for this page */ | |
1367 | flush_dcache_page(page); | |
1368 | kunmap(page); | |
1369 | buf += count; | |
1370 | write_bytes -= count; | |
1371 | ||
1372 | if (page_fault) | |
1373 | break; | |
1374 | } | |
1375 | return page_fault ? -EFAULT : 0; | |
1376 | } | |
1377 | ||
1378 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1379 | { | |
1380 | size_t i; | |
1381 | for (i = 0; i < num_pages; i++) { | |
1382 | if (!pages[i]) | |
1383 | break; | |
1384 | unlock_page(pages[i]); | |
1385 | mark_page_accessed(pages[i]); | |
1386 | page_cache_release(pages[i]); | |
1387 | } | |
1388 | } | |
1389 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1390 | struct btrfs_root *root, | |
1391 | struct file *file, | |
1392 | struct page **pages, | |
1393 | size_t num_pages, | |
1394 | loff_t pos, | |
1395 | size_t write_bytes) | |
1396 | { | |
1397 | int i; | |
1398 | int offset; | |
1399 | int err = 0; | |
1400 | int ret; | |
1401 | int this_write; | |
f254e52c | 1402 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1403 | struct buffer_head *bh; |
1404 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1405 | |
1406 | for (i = 0; i < num_pages; i++) { | |
1407 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1408 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1409 | /* FIXME, one block at a time */ |
1410 | ||
1411 | mutex_lock(&root->fs_info->fs_mutex); | |
1412 | trans = btrfs_start_transaction(root, 1); | |
236454df CM |
1413 | |
1414 | bh = page_buffers(pages[i]); | |
1415 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1416 | struct btrfs_key key; | |
1417 | struct btrfs_path *path; | |
1418 | char *ptr; | |
1419 | u32 datasize; | |
1420 | ||
1421 | path = btrfs_alloc_path(); | |
1422 | BUG_ON(!path); | |
1423 | key.objectid = inode->i_ino; | |
1424 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1425 | key.flags = 0; | |
1426 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1427 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1428 | datasize = offset + | |
1429 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1430 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1431 | datasize); | |
1432 | BUG_ON(ret); | |
1433 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1434 | path->slots[0], struct btrfs_file_extent_item); | |
1435 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1436 | btrfs_set_file_extent_type(ei, | |
1437 | BTRFS_FILE_EXTENT_INLINE); | |
1438 | ptr = btrfs_file_extent_inline_start(ei); | |
1439 | memcpy(ptr, bh->b_data, offset + write_bytes); | |
1440 | mark_buffer_dirty(path->nodes[0]); | |
1441 | btrfs_free_path(path); | |
1442 | } else { | |
1443 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
f254e52c CM |
1444 | pages[i]->index << PAGE_CACHE_SHIFT, |
1445 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1446 | kunmap(pages[i]); |
1447 | } | |
f254e52c CM |
1448 | SetPageChecked(pages[i]); |
1449 | ret = btrfs_end_transaction(trans, root); | |
1450 | BUG_ON(ret); | |
1451 | mutex_unlock(&root->fs_info->fs_mutex); | |
1452 | ||
236454df | 1453 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1454 | offset + this_write); |
1455 | pos += this_write; | |
1456 | if (ret) { | |
1457 | err = ret; | |
1458 | goto failed; | |
1459 | } | |
1460 | WARN_ON(this_write > write_bytes); | |
1461 | write_bytes -= this_write; | |
1462 | } | |
1463 | failed: | |
1464 | return err; | |
1465 | } | |
1466 | ||
b18c6685 CM |
1467 | static int drop_extents(struct btrfs_trans_handle *trans, |
1468 | struct btrfs_root *root, | |
1469 | struct inode *inode, | |
1470 | u64 start, u64 end) | |
1471 | { | |
1472 | int ret; | |
1473 | struct btrfs_key key; | |
1474 | struct btrfs_leaf *leaf; | |
1475 | int slot; | |
1476 | struct btrfs_file_extent_item *extent; | |
236454df | 1477 | u64 extent_end = 0; |
b18c6685 CM |
1478 | int keep; |
1479 | struct btrfs_file_extent_item old; | |
1480 | struct btrfs_path *path; | |
1481 | u64 search_start = start; | |
1482 | int bookend; | |
236454df CM |
1483 | int found_type; |
1484 | int found_extent; | |
1485 | int found_inline; | |
1486 | ||
b18c6685 CM |
1487 | path = btrfs_alloc_path(); |
1488 | if (!path) | |
1489 | return -ENOMEM; | |
a429e513 CM |
1490 | while(1) { |
1491 | btrfs_release_path(root, path); | |
1492 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1493 | search_start, -1); | |
1494 | if (ret < 0) | |
70b2befd | 1495 | goto out; |
a429e513 CM |
1496 | if (ret > 0) { |
1497 | if (path->slots[0] == 0) { | |
236454df | 1498 | ret = 0; |
a429e513 CM |
1499 | goto out; |
1500 | } | |
1501 | path->slots[0]--; | |
70b2befd | 1502 | } |
b18c6685 CM |
1503 | keep = 0; |
1504 | bookend = 0; | |
236454df CM |
1505 | found_extent = 0; |
1506 | found_inline = 0; | |
1507 | extent = NULL; | |
b18c6685 CM |
1508 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1509 | slot = path->slots[0]; | |
1510 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1511 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1512 | ret = 0; | |
1513 | goto out; | |
1514 | } | |
236454df CM |
1515 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1516 | ret = 0; | |
1517 | goto out; | |
1518 | } | |
1519 | extent = btrfs_item_ptr(leaf, slot, | |
1520 | struct btrfs_file_extent_item); | |
1521 | found_type = btrfs_file_extent_type(extent); | |
1522 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1523 | extent_end = key.offset + | |
1524 | (btrfs_file_extent_num_blocks(extent) << | |
1525 | inode->i_blkbits); | |
1526 | found_extent = 1; | |
1527 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1528 | found_inline = 1; | |
1529 | extent_end = key.offset + | |
1530 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1531 | } | |
1532 | ||
1533 | if (!found_extent && !found_inline) { | |
1534 | ret = 0; | |
a429e513 | 1535 | goto out; |
236454df CM |
1536 | } |
1537 | ||
1538 | if (search_start >= extent_end) { | |
1539 | ret = 0; | |
a429e513 | 1540 | goto out; |
236454df CM |
1541 | } |
1542 | ||
a429e513 | 1543 | search_start = extent_end; |
b18c6685 CM |
1544 | |
1545 | if (end < extent_end && end >= key.offset) { | |
236454df CM |
1546 | if (found_extent) { |
1547 | memcpy(&old, extent, sizeof(old)); | |
1548 | ret = btrfs_inc_extent_ref(trans, root, | |
1549 | btrfs_file_extent_disk_blocknr(&old), | |
1550 | btrfs_file_extent_disk_num_blocks(&old)); | |
1551 | BUG_ON(ret); | |
1552 | } | |
1553 | WARN_ON(found_inline); | |
b18c6685 CM |
1554 | bookend = 1; |
1555 | } | |
1556 | ||
1557 | if (start > key.offset) { | |
1558 | u64 new_num; | |
a429e513 | 1559 | u64 old_num; |
b18c6685 CM |
1560 | /* truncate existing extent */ |
1561 | keep = 1; | |
1562 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1563 | if (found_extent) { |
1564 | new_num = (start - key.offset) >> | |
1565 | inode->i_blkbits; | |
1566 | old_num = btrfs_file_extent_num_blocks(extent); | |
1567 | inode->i_blocks -= (old_num - new_num) << 3; | |
1568 | btrfs_set_file_extent_num_blocks(extent, | |
1569 | new_num); | |
1570 | mark_buffer_dirty(path->nodes[0]); | |
1571 | } else { | |
1572 | WARN_ON(1); | |
1573 | /* | |
1574 | ret = btrfs_truncate_item(trans, root, path, | |
1575 | start - key.offset); | |
1576 | BUG_ON(ret); | |
1577 | */ | |
1578 | } | |
b18c6685 CM |
1579 | } |
1580 | if (!keep) { | |
236454df CM |
1581 | u64 disk_blocknr = 0; |
1582 | u64 disk_num_blocks = 0; | |
1583 | u64 extent_num_blocks = 0; | |
1584 | if (found_extent) { | |
1585 | disk_blocknr = | |
1586 | btrfs_file_extent_disk_blocknr(extent); | |
1587 | disk_num_blocks = | |
1588 | btrfs_file_extent_disk_num_blocks(extent); | |
1589 | extent_num_blocks = | |
1590 | btrfs_file_extent_num_blocks(extent); | |
1591 | } | |
b18c6685 CM |
1592 | ret = btrfs_del_item(trans, root, path); |
1593 | BUG_ON(ret); | |
1594 | btrfs_release_path(root, path); | |
236454df CM |
1595 | if (found_extent) { |
1596 | inode->i_blocks -= | |
1597 | btrfs_file_extent_num_blocks(extent) << 3; | |
1598 | ret = btrfs_free_extent(trans, root, | |
1599 | disk_blocknr, | |
1600 | disk_num_blocks, 0); | |
1601 | } | |
b18c6685 CM |
1602 | |
1603 | BUG_ON(ret); | |
1604 | if (!bookend && search_start >= end) { | |
1605 | ret = 0; | |
1606 | goto out; | |
1607 | } | |
1608 | if (!bookend) | |
a429e513 | 1609 | continue; |
b18c6685 | 1610 | } |
236454df | 1611 | if (bookend && found_extent) { |
b18c6685 CM |
1612 | /* create bookend */ |
1613 | struct btrfs_key ins; | |
b18c6685 CM |
1614 | ins.objectid = inode->i_ino; |
1615 | ins.offset = end; | |
1616 | ins.flags = 0; | |
1617 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1618 | ||
1619 | btrfs_release_path(root, path); | |
b18c6685 CM |
1620 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1621 | sizeof(*extent)); | |
1622 | BUG_ON(ret); | |
1623 | extent = btrfs_item_ptr( | |
1624 | btrfs_buffer_leaf(path->nodes[0]), | |
1625 | path->slots[0], | |
1626 | struct btrfs_file_extent_item); | |
1627 | btrfs_set_file_extent_disk_blocknr(extent, | |
1628 | btrfs_file_extent_disk_blocknr(&old)); | |
1629 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1630 | btrfs_file_extent_disk_num_blocks(&old)); | |
1631 | ||
1632 | btrfs_set_file_extent_offset(extent, | |
1633 | btrfs_file_extent_offset(&old) + | |
1634 | ((end - key.offset) >> inode->i_blkbits)); | |
1635 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
1636 | (end - key.offset) >> inode->i_blkbits); | |
1637 | btrfs_set_file_extent_num_blocks(extent, | |
1638 | btrfs_file_extent_num_blocks(&old) - | |
1639 | ((end - key.offset) >> inode->i_blkbits)); | |
1640 | ||
236454df CM |
1641 | btrfs_set_file_extent_type(extent, |
1642 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1643 | btrfs_set_file_extent_generation(extent, |
1644 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1645 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a429e513 CM |
1646 | inode->i_blocks += |
1647 | btrfs_file_extent_num_blocks(extent) << 3; | |
b18c6685 | 1648 | ret = 0; |
70b2befd | 1649 | goto out; |
b18c6685 | 1650 | } |
b18c6685 | 1651 | } |
b18c6685 | 1652 | out: |
b18c6685 CM |
1653 | btrfs_free_path(path); |
1654 | return ret; | |
1655 | } | |
1656 | ||
1657 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1658 | struct file *file, |
1659 | struct page **pages, | |
1660 | size_t num_pages, | |
1661 | loff_t pos, | |
2932f3ec CM |
1662 | unsigned long first_index, |
1663 | unsigned long last_index, | |
6567e837 CM |
1664 | size_t write_bytes, |
1665 | u64 alloc_extent_start) | |
75dfe396 CM |
1666 | { |
1667 | int i; | |
1668 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1669 | struct inode *inode = file->f_path.dentry->d_inode; | |
1670 | int offset; | |
1671 | int err = 0; | |
75dfe396 | 1672 | int this_write; |
6567e837 CM |
1673 | struct buffer_head *bh; |
1674 | struct buffer_head *head; | |
75dfe396 CM |
1675 | loff_t isize = i_size_read(inode); |
1676 | ||
1677 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1678 | ||
1679 | for (i = 0; i < num_pages; i++) { | |
1680 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1681 | if (!pages[i]) { | |
1682 | err = -ENOMEM; | |
1683 | goto failed_release; | |
1684 | } | |
1685 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1686 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
6567e837 CM |
1687 | create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize, |
1688 | (1 << BH_Uptodate)); | |
1689 | head = page_buffers(pages[i]); | |
1690 | bh = head; | |
1691 | do { | |
1692 | err = btrfs_map_bh_to_logical(root, bh, | |
1693 | alloc_extent_start); | |
1694 | BUG_ON(err); | |
1695 | if (err) | |
1696 | goto failed_truncate; | |
1697 | bh = bh->b_this_page; | |
236454df CM |
1698 | if (alloc_extent_start) |
1699 | alloc_extent_start++; | |
6567e837 | 1700 | } while (bh != head); |
75dfe396 | 1701 | pos += this_write; |
75dfe396 CM |
1702 | WARN_ON(this_write > write_bytes); |
1703 | write_bytes -= this_write; | |
1704 | } | |
1705 | return 0; | |
1706 | ||
1707 | failed_release: | |
1708 | btrfs_drop_pages(pages, num_pages); | |
1709 | return err; | |
1710 | ||
1711 | failed_truncate: | |
1712 | btrfs_drop_pages(pages, num_pages); | |
1713 | if (pos > isize) | |
1714 | vmtruncate(inode, isize); | |
1715 | return err; | |
1716 | } | |
1717 | ||
1718 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1719 | size_t count, loff_t *ppos) | |
1720 | { | |
1721 | loff_t pos; | |
1722 | size_t num_written = 0; | |
1723 | int err = 0; | |
1724 | int ret = 0; | |
75dfe396 | 1725 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1726 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1727 | struct page *pages[8]; |
a429e513 | 1728 | struct page *pinned[2] = { NULL, NULL }; |
2932f3ec CM |
1729 | unsigned long first_index; |
1730 | unsigned long last_index; | |
6567e837 CM |
1731 | u64 start_pos; |
1732 | u64 num_blocks; | |
1733 | u64 alloc_extent_start; | |
6567e837 | 1734 | struct btrfs_trans_handle *trans; |
b18c6685 | 1735 | struct btrfs_key ins; |
75dfe396 CM |
1736 | |
1737 | if (file->f_flags & O_DIRECT) | |
1738 | return -EINVAL; | |
1739 | pos = *ppos; | |
75dfe396 CM |
1740 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1741 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1742 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1743 | if (err) | |
1744 | goto out; | |
1745 | if (count == 0) | |
1746 | goto out; | |
1747 | err = remove_suid(file->f_path.dentry); | |
1748 | if (err) | |
1749 | goto out; | |
1750 | file_update_time(file); | |
a429e513 CM |
1751 | |
1752 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1753 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1754 | inode->i_blkbits; | |
1755 | ||
75dfe396 | 1756 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
1757 | first_index = pos >> PAGE_CACHE_SHIFT; |
1758 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 1759 | |
a429e513 CM |
1760 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
1761 | (pos & (PAGE_CACHE_SIZE - 1))) { | |
1762 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
1763 | if (!PageUptodate(pinned[0])) { | |
1764 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
1765 | BUG_ON(ret); | |
1766 | } else { | |
1767 | unlock_page(pinned[0]); | |
1768 | } | |
1769 | } | |
1770 | if (first_index != last_index && | |
1771 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && | |
1772 | (count & (PAGE_CACHE_SIZE - 1))) { | |
1773 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
1774 | if (!PageUptodate(pinned[1])) { | |
1775 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
1776 | BUG_ON(ret); | |
1777 | } else { | |
1778 | unlock_page(pinned[1]); | |
1779 | } | |
1780 | } | |
1781 | ||
6567e837 CM |
1782 | mutex_lock(&root->fs_info->fs_mutex); |
1783 | trans = btrfs_start_transaction(root, 1); | |
1784 | if (!trans) { | |
1785 | err = -ENOMEM; | |
b18c6685 | 1786 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
1787 | goto out_unlock; |
1788 | } | |
a429e513 CM |
1789 | /* FIXME blocksize != 4096 */ |
1790 | inode->i_blocks += num_blocks << 3; | |
b18c6685 | 1791 | if (start_pos < inode->i_size) { |
a429e513 | 1792 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
1793 | ret = drop_extents(trans, root, inode, |
1794 | start_pos, | |
1795 | (pos + count + root->blocksize -1) & | |
a429e513 | 1796 | ~((u64)root->blocksize - 1)); |
236454df | 1797 | BUG_ON(ret); |
b18c6685 | 1798 | } |
236454df CM |
1799 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
1800 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
1801 | ret = btrfs_alloc_extent(trans, root, num_blocks, 1, | |
b18c6685 | 1802 | (u64)-1, &ins); |
236454df CM |
1803 | BUG_ON(ret); |
1804 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
b18c6685 | 1805 | start_pos, ins.objectid, ins.offset); |
236454df CM |
1806 | BUG_ON(ret); |
1807 | } else { | |
1808 | ins.offset = 0; | |
1809 | ins.objectid = 0; | |
1810 | } | |
6567e837 | 1811 | BUG_ON(ret); |
b18c6685 CM |
1812 | alloc_extent_start = ins.objectid; |
1813 | ret = btrfs_end_transaction(trans, root); | |
6567e837 CM |
1814 | mutex_unlock(&root->fs_info->fs_mutex); |
1815 | ||
75dfe396 CM |
1816 | while(count > 0) { |
1817 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1818 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1819 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1820 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
1821 | |
1822 | memset(pages, 0, sizeof(pages)); | |
1823 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
1824 | pos, first_index, last_index, |
1825 | write_bytes, alloc_extent_start); | |
75dfe396 | 1826 | BUG_ON(ret); |
b18c6685 | 1827 | |
6567e837 | 1828 | /* FIXME blocks != pagesize */ |
236454df CM |
1829 | if (alloc_extent_start) |
1830 | alloc_extent_start += num_pages; | |
75dfe396 CM |
1831 | ret = btrfs_copy_from_user(pos, num_pages, |
1832 | write_bytes, pages, buf); | |
1833 | BUG_ON(ret); | |
1834 | ||
f254e52c | 1835 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 1836 | num_pages, pos, write_bytes); |
75dfe396 CM |
1837 | BUG_ON(ret); |
1838 | btrfs_drop_pages(pages, num_pages); | |
1839 | ||
75dfe396 CM |
1840 | buf += write_bytes; |
1841 | count -= write_bytes; | |
1842 | pos += write_bytes; | |
1843 | num_written += write_bytes; | |
1844 | ||
1845 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1846 | cond_resched(); | |
1847 | } | |
6567e837 | 1848 | out_unlock: |
75dfe396 CM |
1849 | mutex_unlock(&inode->i_mutex); |
1850 | out: | |
a429e513 CM |
1851 | if (pinned[0]) |
1852 | page_cache_release(pinned[0]); | |
1853 | if (pinned[1]) | |
1854 | page_cache_release(pinned[1]); | |
75dfe396 CM |
1855 | *ppos = pos; |
1856 | current->backing_dev_info = NULL; | |
a429e513 | 1857 | mark_inode_dirty(inode); |
75dfe396 CM |
1858 | return num_written ? num_written : err; |
1859 | } | |
1860 | ||
f254e52c CM |
1861 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1862 | unsigned long offset, unsigned long size) | |
1863 | { | |
1864 | char *kaddr; | |
1865 | unsigned long left, count = desc->count; | |
d6e4a428 | 1866 | struct inode *inode = page->mapping->host; |
f254e52c CM |
1867 | |
1868 | if (size > count) | |
1869 | size = count; | |
1870 | ||
1871 | if (!PageChecked(page)) { | |
1872 | /* FIXME, do it per block */ | |
d6e4a428 | 1873 | struct btrfs_root *root = BTRFS_I(inode)->root; |
236454df | 1874 | |
f254e52c | 1875 | int ret = btrfs_csum_verify_file_block(root, |
236454df CM |
1876 | page->mapping->host->i_ino, |
1877 | page->index << PAGE_CACHE_SHIFT, | |
1878 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c CM |
1879 | if (ret) { |
1880 | printk("failed to verify ino %lu page %lu\n", | |
1881 | page->mapping->host->i_ino, | |
1882 | page->index); | |
1883 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
1884 | } | |
1885 | SetPageChecked(page); | |
1886 | kunmap(page); | |
1887 | } | |
1888 | /* | |
1889 | * Faults on the destination of a read are common, so do it before | |
1890 | * taking the kmap. | |
1891 | */ | |
1892 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
1893 | kaddr = kmap_atomic(page, KM_USER0); | |
1894 | left = __copy_to_user_inatomic(desc->arg.buf, | |
1895 | kaddr + offset, size); | |
1896 | kunmap_atomic(kaddr, KM_USER0); | |
1897 | if (left == 0) | |
1898 | goto success; | |
1899 | } | |
1900 | ||
1901 | /* Do it the slow way */ | |
1902 | kaddr = kmap(page); | |
1903 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
1904 | kunmap(page); | |
1905 | ||
1906 | if (left) { | |
1907 | size -= left; | |
1908 | desc->error = -EFAULT; | |
1909 | } | |
1910 | success: | |
1911 | desc->count = count - size; | |
1912 | desc->written += size; | |
1913 | desc->arg.buf += size; | |
1914 | return size; | |
1915 | } | |
1916 | ||
1917 | /** | |
1918 | * btrfs_file_aio_read - filesystem read routine | |
1919 | * @iocb: kernel I/O control block | |
1920 | * @iov: io vector request | |
1921 | * @nr_segs: number of segments in the iovec | |
1922 | * @pos: current file position | |
1923 | */ | |
1924 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
1925 | unsigned long nr_segs, loff_t pos) | |
1926 | { | |
1927 | struct file *filp = iocb->ki_filp; | |
1928 | ssize_t retval; | |
1929 | unsigned long seg; | |
1930 | size_t count; | |
1931 | loff_t *ppos = &iocb->ki_pos; | |
1932 | ||
1933 | count = 0; | |
1934 | for (seg = 0; seg < nr_segs; seg++) { | |
1935 | const struct iovec *iv = &iov[seg]; | |
1936 | ||
1937 | /* | |
1938 | * If any segment has a negative length, or the cumulative | |
1939 | * length ever wraps negative then return -EINVAL. | |
1940 | */ | |
1941 | count += iv->iov_len; | |
1942 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
1943 | return -EINVAL; | |
1944 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
1945 | continue; | |
1946 | if (seg == 0) | |
1947 | return -EFAULT; | |
1948 | nr_segs = seg; | |
1949 | count -= iv->iov_len; /* This segment is no good */ | |
1950 | break; | |
1951 | } | |
1952 | retval = 0; | |
1953 | if (count) { | |
1954 | for (seg = 0; seg < nr_segs; seg++) { | |
1955 | read_descriptor_t desc; | |
1956 | ||
1957 | desc.written = 0; | |
1958 | desc.arg.buf = iov[seg].iov_base; | |
1959 | desc.count = iov[seg].iov_len; | |
1960 | if (desc.count == 0) | |
1961 | continue; | |
1962 | desc.error = 0; | |
1963 | do_generic_file_read(filp, ppos, &desc, | |
1964 | btrfs_read_actor); | |
1965 | retval += desc.written; | |
1966 | if (desc.error) { | |
1967 | retval = retval ?: desc.error; | |
1968 | break; | |
1969 | } | |
1970 | } | |
1971 | } | |
1972 | return retval; | |
1973 | } | |
1974 | ||
2619ba1f CM |
1975 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
1976 | { | |
1977 | struct btrfs_trans_handle *trans; | |
1978 | struct btrfs_key key; | |
1979 | struct btrfs_root_item root_item; | |
1980 | struct btrfs_inode_item *inode_item; | |
1981 | struct buffer_head *subvol; | |
1982 | struct btrfs_leaf *leaf; | |
1983 | struct btrfs_root *new_root; | |
1984 | struct inode *inode; | |
1985 | int ret; | |
1986 | u64 objectid; | |
1987 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
1988 | ||
1989 | mutex_lock(&root->fs_info->fs_mutex); | |
1990 | trans = btrfs_start_transaction(root, 1); | |
1991 | BUG_ON(!trans); | |
1992 | ||
1993 | subvol = btrfs_alloc_free_block(trans, root); | |
1994 | leaf = btrfs_buffer_leaf(subvol); | |
1995 | btrfs_set_header_nritems(&leaf->header, 0); | |
1996 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 1997 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f CM |
1998 | btrfs_set_header_generation(&leaf->header, trans->transid); |
1999 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, | |
2000 | sizeof(leaf->header.fsid)); | |
2001 | ||
2002 | inode_item = &root_item.inode; | |
2003 | memset(inode_item, 0, sizeof(*inode_item)); | |
2004 | btrfs_set_inode_generation(inode_item, 1); | |
2005 | btrfs_set_inode_size(inode_item, 3); | |
2006 | btrfs_set_inode_nlink(inode_item, 1); | |
2007 | btrfs_set_inode_nblocks(inode_item, 1); | |
2008 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2009 | ||
7eccb903 | 2010 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f CM |
2011 | btrfs_set_root_refs(&root_item, 1); |
2012 | ||
2013 | mark_buffer_dirty(subvol); | |
2014 | brelse(subvol); | |
2015 | subvol = NULL; | |
2016 | ||
2017 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2018 | 0, &objectid); | |
2019 | BUG_ON(ret); | |
2020 | ||
2021 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2022 | ||
2023 | key.objectid = objectid; | |
2024 | key.offset = 1; | |
2025 | key.flags = 0; | |
2026 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2027 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2028 | &root_item); | |
2029 | BUG_ON(ret); | |
2030 | ||
2031 | /* | |
2032 | * insert the directory item | |
2033 | */ | |
2034 | key.offset = (u64)-1; | |
2035 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2036 | name, namelen, | |
2037 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2038 | &key, 0); | |
2039 | BUG_ON(ret); | |
2040 | ||
2041 | ret = btrfs_commit_transaction(trans, root); | |
2042 | BUG_ON(ret); | |
2043 | ||
2044 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2045 | BUG_ON(!new_root); | |
2046 | ||
2047 | trans = btrfs_start_transaction(new_root, 1); | |
2048 | BUG_ON(!trans); | |
2049 | ||
2050 | inode = btrfs_new_inode(trans, new_root, new_dirid, S_IFDIR | 0700); | |
2051 | inode->i_op = &btrfs_dir_inode_operations; | |
2052 | inode->i_fop = &btrfs_dir_file_operations; | |
2053 | ||
2054 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2055 | BUG_ON(ret); | |
2056 | ||
2057 | inode->i_nlink = 1; | |
2058 | inode->i_size = 6; | |
2059 | ret = btrfs_update_inode(trans, new_root, inode); | |
2060 | BUG_ON(ret); | |
2061 | ||
2062 | ret = btrfs_commit_transaction(trans, new_root); | |
2063 | BUG_ON(ret); | |
2064 | ||
2065 | iput(inode); | |
2066 | ||
2067 | mutex_unlock(&root->fs_info->fs_mutex); | |
2068 | return 0; | |
2069 | } | |
2070 | ||
c5739bba CM |
2071 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2072 | { | |
2073 | struct btrfs_trans_handle *trans; | |
2074 | struct btrfs_key key; | |
2075 | struct btrfs_root_item new_root_item; | |
2076 | int ret; | |
2077 | u64 objectid; | |
2078 | ||
2619ba1f CM |
2079 | if (!root->ref_cows) |
2080 | return -EINVAL; | |
2081 | ||
c5739bba CM |
2082 | mutex_lock(&root->fs_info->fs_mutex); |
2083 | trans = btrfs_start_transaction(root, 1); | |
2084 | BUG_ON(!trans); | |
2085 | ||
2086 | ret = btrfs_update_inode(trans, root, root->inode); | |
2087 | BUG_ON(ret); | |
2088 | ||
1b05da2e CM |
2089 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2090 | 0, &objectid); | |
c5739bba CM |
2091 | BUG_ON(ret); |
2092 | ||
c5739bba CM |
2093 | memcpy(&new_root_item, &root->root_item, |
2094 | sizeof(new_root_item)); | |
2095 | ||
c5739bba CM |
2096 | key.objectid = objectid; |
2097 | key.offset = 1; | |
2098 | key.flags = 0; | |
2099 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2100 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2101 | |
2102 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2103 | &new_root_item); | |
2104 | BUG_ON(ret); | |
2105 | ||
c5739bba CM |
2106 | /* |
2107 | * insert the directory item | |
2108 | */ | |
2109 | key.offset = (u64)-1; | |
2110 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2111 | name, namelen, | |
2112 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2113 | &key, 0); | |
2114 | ||
2115 | BUG_ON(ret); | |
2116 | ||
2117 | ret = btrfs_inc_root_ref(trans, root); | |
2118 | BUG_ON(ret); | |
2119 | ||
2120 | ret = btrfs_commit_transaction(trans, root); | |
2121 | BUG_ON(ret); | |
2122 | mutex_unlock(&root->fs_info->fs_mutex); | |
2123 | return 0; | |
2124 | } | |
2125 | ||
8352d8a4 CM |
2126 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2127 | { | |
2128 | struct block_device *bdev; | |
2129 | struct btrfs_path *path; | |
2130 | struct super_block *sb = root->fs_info->sb; | |
2131 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2132 | struct btrfs_trans_handle *trans; | |
2133 | struct btrfs_device_item *dev_item; | |
2134 | struct btrfs_key key; | |
2135 | u16 item_size; | |
2136 | u64 num_blocks; | |
2137 | u64 new_blocks; | |
b4100d64 | 2138 | u64 device_id; |
8352d8a4 | 2139 | int ret; |
b4100d64 | 2140 | |
8352d8a4 CM |
2141 | printk("adding disk %s\n", name); |
2142 | path = btrfs_alloc_path(); | |
2143 | if (!path) | |
2144 | return -ENOMEM; | |
2145 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2146 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2147 | if (IS_ERR(bdev)) { | |
2148 | ret = PTR_ERR(bdev); | |
2149 | printk("open bdev excl failed ret %d\n", ret); | |
2150 | goto out_nolock; | |
2151 | } | |
2152 | set_blocksize(bdev, sb->s_blocksize); | |
2153 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2154 | key.objectid = num_blocks; | |
2155 | key.offset = new_blocks; | |
2156 | key.flags = 0; | |
2157 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2158 | ||
2159 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2160 | trans = btrfs_start_transaction(dev_root, 1); | |
2161 | item_size = sizeof(*dev_item) + namelen; | |
2162 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2163 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2164 | if (ret) { | |
2165 | printk("insert failed %d\n", ret); | |
2166 | close_bdev_excl(bdev); | |
2167 | if (ret > 0) | |
2168 | ret = -EEXIST; | |
2169 | goto out; | |
2170 | } | |
2171 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2172 | path->slots[0], struct btrfs_device_item); | |
2173 | btrfs_set_device_pathlen(dev_item, namelen); | |
2174 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2175 | |
2176 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2177 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2178 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2179 | mark_buffer_dirty(path->nodes[0]); |
2180 | ||
b4100d64 CM |
2181 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2182 | new_blocks); | |
8352d8a4 CM |
2183 | |
2184 | if (!ret) { | |
2185 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2186 | num_blocks + new_blocks); | |
2187 | i_size_write(root->fs_info->btree_inode, | |
2188 | (num_blocks + new_blocks) << | |
2189 | root->fs_info->btree_inode->i_blkbits); | |
2190 | } | |
2191 | ||
2192 | out: | |
2193 | ret = btrfs_commit_transaction(trans, dev_root); | |
2194 | BUG_ON(ret); | |
2195 | mutex_unlock(&root->fs_info->fs_mutex); | |
2196 | out_nolock: | |
2197 | btrfs_free_path(path); | |
2198 | ||
2199 | return ret; | |
2200 | } | |
2201 | ||
c5739bba CM |
2202 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2203 | cmd, unsigned long arg) | |
2204 | { | |
2205 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2206 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2207 | int ret = 0; |
7e38180e | 2208 | struct btrfs_dir_item *di; |
c5739bba | 2209 | int namelen; |
2619ba1f CM |
2210 | struct btrfs_path *path; |
2211 | u64 root_dirid; | |
c5739bba | 2212 | |
c5739bba CM |
2213 | switch (cmd) { |
2214 | case BTRFS_IOC_SNAP_CREATE: | |
2215 | if (copy_from_user(&vol_args, | |
2216 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2217 | sizeof(vol_args))) | |
2218 | return -EFAULT; | |
2219 | namelen = strlen(vol_args.name); | |
2220 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2221 | return -EINVAL; | |
2619ba1f CM |
2222 | path = btrfs_alloc_path(); |
2223 | if (!path) | |
2224 | return -ENOMEM; | |
2d13d8d0 | 2225 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2226 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2227 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2228 | path, root_dirid, |
2229 | vol_args.name, namelen, 0); | |
2230 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2231 | btrfs_free_path(path); |
7e38180e | 2232 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2233 | return -EEXIST; |
2234 | ||
2235 | if (root == root->fs_info->tree_root) | |
2236 | ret = create_subvol(root, vol_args.name, namelen); | |
2237 | else | |
2238 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2239 | WARN_ON(ret); |
2240 | break; | |
8352d8a4 CM |
2241 | case BTRFS_IOC_ADD_DISK: |
2242 | if (copy_from_user(&vol_args, | |
2243 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2244 | sizeof(vol_args))) | |
2245 | return -EFAULT; | |
2246 | namelen = strlen(vol_args.name); | |
2247 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2248 | return -EINVAL; | |
2249 | vol_args.name[namelen] = '\0'; | |
2250 | ret = add_disk(root, vol_args.name, namelen); | |
2251 | break; | |
c5739bba CM |
2252 | default: |
2253 | return -ENOTTY; | |
2254 | } | |
8352d8a4 | 2255 | return ret; |
c5739bba CM |
2256 | } |
2257 | ||
2c90e5d6 CM |
2258 | static struct kmem_cache *btrfs_inode_cachep; |
2259 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2260 | struct kmem_cache *btrfs_transaction_cachep; | |
2261 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2262 | struct kmem_cache *btrfs_path_cachep; | |
2263 | ||
2264 | /* | |
2265 | * Called inside transaction, so use GFP_NOFS | |
2266 | */ | |
2267 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2268 | { | |
2269 | struct btrfs_inode *ei; | |
2270 | ||
2271 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2272 | if (!ei) | |
2273 | return NULL; | |
2c90e5d6 CM |
2274 | return &ei->vfs_inode; |
2275 | } | |
2276 | ||
2277 | static void btrfs_destroy_inode(struct inode *inode) | |
2278 | { | |
2c90e5d6 | 2279 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2280 | WARN_ON(inode->i_data.nrpages); |
2281 | ||
2c90e5d6 CM |
2282 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2283 | } | |
2284 | ||
2285 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2286 | unsigned long flags) | |
2287 | { | |
2288 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2289 | ||
2290 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
2291 | SLAB_CTOR_CONSTRUCTOR) { | |
2292 | inode_init_once(&ei->vfs_inode); | |
2293 | } | |
2294 | } | |
2295 | ||
2296 | static int init_inodecache(void) | |
2297 | { | |
2298 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2299 | sizeof(struct btrfs_inode), | |
2300 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2301 | SLAB_MEM_SPREAD), | |
2302 | init_once, NULL); | |
2303 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2304 | sizeof(struct btrfs_trans_handle), | |
2305 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2306 | SLAB_MEM_SPREAD), | |
2307 | NULL, NULL); | |
2308 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2309 | sizeof(struct btrfs_transaction), | |
2310 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2311 | SLAB_MEM_SPREAD), | |
2312 | NULL, NULL); | |
2313 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2314 | sizeof(struct btrfs_transaction), | |
2315 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2316 | SLAB_MEM_SPREAD), | |
2317 | NULL, NULL); | |
2318 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2319 | 256, | |
2320 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2321 | SLAB_MEM_SPREAD | | |
2322 | SLAB_DESTROY_BY_RCU), | |
2323 | NULL, NULL); | |
2324 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2325 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2326 | return -ENOMEM; | |
2327 | return 0; | |
2328 | } | |
2329 | ||
2330 | static void destroy_inodecache(void) | |
2331 | { | |
2332 | kmem_cache_destroy(btrfs_inode_cachep); | |
2333 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2334 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2335 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2336 | kmem_cache_destroy(btrfs_path_cachep); | |
2337 | } | |
2338 | ||
2e635a27 CM |
2339 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2340 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2341 | { | |
2342 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2343 | btrfs_fill_super, mnt); | |
2344 | } | |
2345 | ||
236454df CM |
2346 | |
2347 | static int btrfs_getattr(struct vfsmount *mnt, | |
2348 | struct dentry *dentry, struct kstat *stat) | |
2349 | { | |
2350 | struct inode *inode = dentry->d_inode; | |
2351 | generic_fillattr(inode, stat); | |
2352 | stat->blksize = 256 * 1024; | |
2353 | return 0; | |
2354 | } | |
2355 | ||
2e635a27 CM |
2356 | static struct file_system_type btrfs_fs_type = { |
2357 | .owner = THIS_MODULE, | |
2358 | .name = "btrfs", | |
2359 | .get_sb = btrfs_get_sb, | |
2360 | .kill_sb = kill_block_super, | |
2361 | .fs_flags = FS_REQUIRES_DEV, | |
2362 | }; | |
2363 | ||
e20d96d6 CM |
2364 | static struct super_operations btrfs_super_ops = { |
2365 | .statfs = simple_statfs, | |
134e9731 | 2366 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2367 | .put_super = btrfs_put_super, |
2368 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2369 | .write_super = btrfs_write_super, |
2370 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2371 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2372 | .alloc_inode = btrfs_alloc_inode, |
2373 | .destroy_inode = btrfs_destroy_inode, | |
e20d96d6 CM |
2374 | }; |
2375 | ||
2376 | static struct inode_operations btrfs_dir_inode_operations = { | |
2377 | .lookup = btrfs_lookup, | |
d5719762 | 2378 | .create = btrfs_create, |
134e9731 | 2379 | .unlink = btrfs_unlink, |
f7922033 | 2380 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2381 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
2382 | }; |
2383 | ||
d6e4a428 CM |
2384 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2385 | .lookup = btrfs_lookup, | |
2386 | }; | |
2387 | ||
e20d96d6 CM |
2388 | static struct file_operations btrfs_dir_file_operations = { |
2389 | .llseek = generic_file_llseek, | |
2390 | .read = generic_read_dir, | |
2391 | .readdir = btrfs_readdir, | |
c5739bba | 2392 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2393 | }; |
2394 | ||
dee26a9f CM |
2395 | static struct address_space_operations btrfs_aops = { |
2396 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2397 | .writepage = btrfs_writepage, |
2398 | .sync_page = block_sync_page, | |
2399 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2400 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2401 | }; |
2402 | ||
2403 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 2404 | .truncate = btrfs_truncate, |
236454df | 2405 | .getattr = btrfs_getattr, |
dee26a9f CM |
2406 | }; |
2407 | ||
2408 | static struct file_operations btrfs_file_operations = { | |
2409 | .llseek = generic_file_llseek, | |
2410 | .read = do_sync_read, | |
e8f05c45 CM |
2411 | .aio_read = btrfs_file_aio_read, |
2412 | .write = btrfs_file_write, | |
dee26a9f CM |
2413 | .mmap = generic_file_mmap, |
2414 | .open = generic_file_open, | |
c5739bba | 2415 | .ioctl = btrfs_ioctl, |
dee26a9f | 2416 | }; |
e20d96d6 | 2417 | |
2e635a27 CM |
2418 | static int __init init_btrfs_fs(void) |
2419 | { | |
2c90e5d6 | 2420 | int err; |
2e635a27 | 2421 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2422 | err = init_inodecache(); |
2423 | if (err) | |
2424 | return err; | |
d6e4a428 CM |
2425 | kset_set_kset_s(&btrfs_subsys, fs_subsys); |
2426 | err = subsystem_register(&btrfs_subsys); | |
2427 | if (err) | |
2428 | goto out; | |
2e635a27 | 2429 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2430 | out: |
2431 | destroy_inodecache(); | |
2432 | return err; | |
2e635a27 CM |
2433 | } |
2434 | ||
2435 | static void __exit exit_btrfs_fs(void) | |
2436 | { | |
2c90e5d6 | 2437 | destroy_inodecache(); |
2e635a27 | 2438 | unregister_filesystem(&btrfs_fs_type); |
d6e4a428 | 2439 | subsystem_unregister(&btrfs_subsys); |
2e635a27 CM |
2440 | printk("btrfs unloaded\n"); |
2441 | } | |
2442 | ||
2443 | module_init(init_btrfs_fs) | |
2444 | module_exit(exit_btrfs_fs) | |
2445 | ||
2446 | MODULE_LICENSE("GPL"); |