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; | |
130 | int ret; | |
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); | |
137 | ret = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, | |
134e9731 CM |
138 | name, name_len, -1); |
139 | if (ret < 0) | |
140 | goto err; | |
141 | if (ret > 0) { | |
142 | ret = -ENOENT; | |
143 | goto err; | |
144 | } | |
5caf2a00 | 145 | di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
134e9731 | 146 | struct btrfs_dir_item); |
d6e4a428 | 147 | objectid = btrfs_disk_key_objectid(&di->location); |
134e9731 | 148 | |
5f26f772 CM |
149 | ret = btrfs_del_item(trans, root, path); |
150 | BUG_ON(ret); | |
151 | ||
152 | btrfs_release_path(root, path); | |
153 | ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
154 | objectid, -1); | |
155 | BUG_ON(ret); | |
5caf2a00 | 156 | ret = btrfs_del_item(trans, root, path); |
134e9731 CM |
157 | BUG_ON(ret); |
158 | dentry->d_inode->i_ctime = dir->i_ctime; | |
159 | err: | |
5caf2a00 CM |
160 | btrfs_release_path(root, path); |
161 | btrfs_free_path(path); | |
d4dbff95 | 162 | if (ret == 0) { |
134e9731 | 163 | inode_dec_link_count(dentry->d_inode); |
5f26f772 | 164 | dir->i_size -= name_len * 2; |
d4dbff95 CM |
165 | mark_inode_dirty(dir); |
166 | } | |
134e9731 CM |
167 | return ret; |
168 | } | |
169 | ||
5f443fd2 CM |
170 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
171 | { | |
172 | struct btrfs_root *root; | |
173 | struct btrfs_trans_handle *trans; | |
174 | int ret; | |
175 | ||
d6e4a428 | 176 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
177 | mutex_lock(&root->fs_info->fs_mutex); |
178 | trans = btrfs_start_transaction(root, 1); | |
179 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
180 | btrfs_end_transaction(trans, root); | |
181 | mutex_unlock(&root->fs_info->fs_mutex); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
186 | { | |
187 | struct inode *inode = dentry->d_inode; | |
188 | int err; | |
189 | int ret; | |
d6e4a428 | 190 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 191 | struct btrfs_path *path; |
5f443fd2 CM |
192 | struct btrfs_key key; |
193 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
194 | struct btrfs_key found_key; |
195 | int found_type; | |
5f443fd2 | 196 | struct btrfs_leaf *leaf; |
5f26f772 | 197 | char *goodnames = ".."; |
5f443fd2 | 198 | |
5caf2a00 CM |
199 | path = btrfs_alloc_path(); |
200 | BUG_ON(!path); | |
201 | btrfs_init_path(path); | |
5f443fd2 CM |
202 | mutex_lock(&root->fs_info->fs_mutex); |
203 | trans = btrfs_start_transaction(root, 1); | |
204 | key.objectid = inode->i_ino; | |
205 | key.offset = (u64)-1; | |
5f26f772 CM |
206 | key.flags = (u32)-1; |
207 | while(1) { | |
208 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
209 | if (ret < 0) { | |
210 | err = ret; | |
211 | goto out; | |
212 | } | |
213 | BUG_ON(ret == 0); | |
214 | if (path->slots[0] == 0) { | |
215 | err = -ENOENT; | |
216 | goto out; | |
217 | } | |
218 | path->slots[0]--; | |
219 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
220 | btrfs_disk_key_to_cpu(&found_key, | |
221 | &leaf->items[path->slots[0]].key); | |
222 | found_type = btrfs_key_type(&found_key); | |
223 | if (found_key.objectid != inode->i_ino) { | |
224 | err = -ENOENT; | |
225 | goto out; | |
226 | } | |
227 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
228 | found_type != BTRFS_DIR_INDEX_KEY) || | |
229 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
230 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
231 | err = -ENOTEMPTY; | |
232 | goto out; | |
233 | } | |
234 | ret = btrfs_del_item(trans, root, path); | |
235 | BUG_ON(ret); | |
5f443fd2 | 236 | |
5f26f772 CM |
237 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
238 | break; | |
239 | btrfs_release_path(root, path); | |
5f443fd2 | 240 | } |
5f26f772 | 241 | ret = 0; |
5caf2a00 | 242 | btrfs_release_path(root, path); |
5f443fd2 CM |
243 | |
244 | /* now the directory is empty */ | |
245 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
246 | if (!err) { | |
247 | inode->i_size = 0; | |
248 | } | |
249 | out: | |
7cfcc17e CM |
250 | btrfs_release_path(root, path); |
251 | btrfs_free_path(path); | |
5f443fd2 CM |
252 | mutex_unlock(&root->fs_info->fs_mutex); |
253 | ret = btrfs_end_transaction(trans, root); | |
254 | if (ret && !err) | |
255 | err = ret; | |
256 | return err; | |
257 | } | |
258 | ||
134e9731 CM |
259 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
260 | struct btrfs_root *root, | |
261 | struct inode *inode) | |
262 | { | |
5caf2a00 | 263 | struct btrfs_path *path; |
134e9731 | 264 | int ret; |
5caf2a00 | 265 | |
134e9731 | 266 | clear_inode(inode); |
5caf2a00 CM |
267 | |
268 | path = btrfs_alloc_path(); | |
269 | BUG_ON(!path); | |
270 | btrfs_init_path(path); | |
d6e4a428 CM |
271 | ret = btrfs_lookup_inode(trans, root, path, |
272 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 273 | BUG_ON(ret); |
5caf2a00 | 274 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 275 | BUG_ON(ret); |
5caf2a00 | 276 | btrfs_free_path(path); |
134e9731 CM |
277 | return ret; |
278 | } | |
279 | ||
f4b9aa8d CM |
280 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
281 | struct btrfs_root *root, | |
282 | struct inode *inode) | |
283 | { | |
284 | int ret; | |
5caf2a00 | 285 | struct btrfs_path *path; |
f4b9aa8d CM |
286 | struct btrfs_key key; |
287 | struct btrfs_disk_key *found_key; | |
288 | struct btrfs_leaf *leaf; | |
f254e52c CM |
289 | struct btrfs_file_extent_item *fi = NULL; |
290 | u64 extent_start = 0; | |
291 | u64 extent_num_blocks = 0; | |
292 | int found_extent; | |
f4b9aa8d | 293 | |
5caf2a00 CM |
294 | path = btrfs_alloc_path(); |
295 | BUG_ON(!path); | |
f4b9aa8d CM |
296 | /* FIXME, add redo link to tree so we don't leak on crash */ |
297 | key.objectid = inode->i_ino; | |
298 | key.offset = (u64)-1; | |
299 | key.flags = 0; | |
d4dbff95 CM |
300 | /* |
301 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
302 | * or extent data | |
303 | */ | |
f254e52c | 304 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 305 | while(1) { |
5caf2a00 CM |
306 | btrfs_init_path(path); |
307 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 308 | if (ret < 0) { |
f4b9aa8d CM |
309 | goto error; |
310 | } | |
311 | if (ret > 0) { | |
5caf2a00 CM |
312 | BUG_ON(path->slots[0] == 0); |
313 | path->slots[0]--; | |
f4b9aa8d | 314 | } |
5caf2a00 CM |
315 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
316 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
317 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
318 | break; | |
f254e52c | 319 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
d4dbff95 | 320 | btrfs_disk_key_type(found_key) != BTRFS_INLINE_DATA_KEY && |
f254e52c | 321 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) |
f4b9aa8d | 322 | break; |
f4b9aa8d CM |
323 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
324 | break; | |
f254e52c | 325 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
326 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
327 | path->slots[0], | |
f254e52c CM |
328 | struct btrfs_file_extent_item); |
329 | extent_start = btrfs_file_extent_disk_blocknr(fi); | |
330 | extent_num_blocks = | |
331 | btrfs_file_extent_disk_num_blocks(fi); | |
332 | inode->i_blocks -= | |
333 | btrfs_file_extent_num_blocks(fi) >> 9; | |
334 | found_extent = 1; | |
335 | } else { | |
336 | found_extent = 0; | |
337 | } | |
5caf2a00 | 338 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 339 | BUG_ON(ret); |
5caf2a00 | 340 | btrfs_release_path(root, path); |
f254e52c CM |
341 | if (found_extent) { |
342 | ret = btrfs_free_extent(trans, root, extent_start, | |
343 | extent_num_blocks, 0); | |
344 | BUG_ON(ret); | |
345 | } | |
f4b9aa8d | 346 | } |
f4b9aa8d CM |
347 | ret = 0; |
348 | error: | |
5caf2a00 CM |
349 | btrfs_release_path(root, path); |
350 | btrfs_free_path(path); | |
f4b9aa8d CM |
351 | return ret; |
352 | } | |
353 | ||
134e9731 CM |
354 | static void btrfs_delete_inode(struct inode *inode) |
355 | { | |
356 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 357 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
358 | int ret; |
359 | ||
134e9731 CM |
360 | truncate_inode_pages(&inode->i_data, 0); |
361 | if (is_bad_inode(inode)) { | |
362 | goto no_delete; | |
363 | } | |
364 | inode->i_size = 0; | |
134e9731 CM |
365 | mutex_lock(&root->fs_info->fs_mutex); |
366 | trans = btrfs_start_transaction(root, 1); | |
f4b9aa8d CM |
367 | if (S_ISREG(inode->i_mode)) { |
368 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
369 | BUG_ON(ret); | |
370 | } | |
134e9731 CM |
371 | btrfs_free_inode(trans, root, inode); |
372 | btrfs_end_transaction(trans, root); | |
373 | mutex_unlock(&root->fs_info->fs_mutex); | |
374 | return; | |
375 | no_delete: | |
376 | clear_inode(inode); | |
377 | } | |
378 | ||
e20d96d6 | 379 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 380 | struct btrfs_key *location) |
e20d96d6 CM |
381 | { |
382 | const char *name = dentry->d_name.name; | |
383 | int namelen = dentry->d_name.len; | |
384 | struct btrfs_dir_item *di; | |
5caf2a00 | 385 | struct btrfs_path *path; |
d6e4a428 | 386 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
387 | int ret; |
388 | ||
5caf2a00 CM |
389 | path = btrfs_alloc_path(); |
390 | BUG_ON(!path); | |
391 | btrfs_init_path(path); | |
392 | ret = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, | |
e20d96d6 | 393 | namelen, 0); |
5caf2a00 | 394 | if (ret || !btrfs_match_dir_item_name(root, path, name, namelen)) { |
d6e4a428 | 395 | location->objectid = 0; |
2c90e5d6 | 396 | ret = 0; |
e20d96d6 CM |
397 | goto out; |
398 | } | |
5caf2a00 | 399 | di = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
e20d96d6 | 400 | struct btrfs_dir_item); |
d6e4a428 | 401 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 402 | out: |
5caf2a00 CM |
403 | btrfs_release_path(root, path); |
404 | btrfs_free_path(path); | |
e20d96d6 CM |
405 | return ret; |
406 | } | |
407 | ||
d6e4a428 CM |
408 | int fixup_tree_root_location(struct btrfs_root *root, |
409 | struct btrfs_key *location, | |
410 | struct btrfs_root **sub_root) | |
411 | { | |
412 | struct btrfs_path *path; | |
413 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
414 | |
415 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
416 | return 0; | |
417 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
418 | return 0; | |
419 | ||
420 | path = btrfs_alloc_path(); | |
421 | BUG_ON(!path); | |
422 | mutex_lock(&root->fs_info->fs_mutex); | |
423 | ||
0f7d52f4 CM |
424 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
425 | if (IS_ERR(*sub_root)) | |
426 | return PTR_ERR(*sub_root); | |
427 | ||
428 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
429 | location->objectid = btrfs_root_dirid(ri); |
430 | location->flags = 0; | |
431 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
432 | location->offset = 0; | |
0f7d52f4 | 433 | |
d6e4a428 CM |
434 | btrfs_free_path(path); |
435 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 436 | return 0; |
d6e4a428 CM |
437 | } |
438 | ||
c5739bba CM |
439 | int btrfs_init_locked_inode(struct inode *inode, void *p) |
440 | { | |
441 | struct btrfs_iget_args *args = p; | |
442 | inode->i_ino = args->ino; | |
443 | BTRFS_I(inode)->root = args->root; | |
444 | return 0; | |
445 | } | |
446 | ||
447 | int btrfs_find_actor(struct inode *inode, void *opaque) | |
448 | { | |
449 | struct btrfs_iget_args *args = opaque; | |
450 | return (args->ino == inode->i_ino && | |
451 | args->root == BTRFS_I(inode)->root); | |
452 | } | |
453 | ||
454 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
455 | struct btrfs_root *root) | |
456 | { | |
457 | struct inode *inode; | |
458 | struct btrfs_iget_args args; | |
459 | args.ino = objectid; | |
460 | args.root = root; | |
461 | ||
462 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
463 | btrfs_init_locked_inode, | |
464 | (void *)&args); | |
465 | return inode; | |
466 | } | |
d6e4a428 | 467 | |
e20d96d6 CM |
468 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
469 | struct nameidata *nd) | |
470 | { | |
471 | struct inode * inode; | |
d6e4a428 CM |
472 | struct btrfs_inode *bi = BTRFS_I(dir); |
473 | struct btrfs_root *root = bi->root; | |
474 | struct btrfs_root *sub_root = root; | |
475 | struct btrfs_key location; | |
e20d96d6 CM |
476 | int ret; |
477 | ||
478 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
479 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 480 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 481 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 482 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
483 | if (ret < 0) |
484 | return ERR_PTR(ret); | |
485 | inode = NULL; | |
d6e4a428 CM |
486 | if (location.objectid) { |
487 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
488 | if (ret < 0) | |
489 | return ERR_PTR(ret); | |
490 | if (ret > 0) | |
491 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
492 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
493 | sub_root); | |
e20d96d6 CM |
494 | if (!inode) |
495 | return ERR_PTR(-EACCES); | |
d6e4a428 | 496 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 497 | if (sub_root != root) { |
c5739bba | 498 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
499 | igrab(inode); |
500 | sub_root->inode = inode; | |
501 | } | |
d6e4a428 CM |
502 | BTRFS_I(inode)->root = sub_root; |
503 | memcpy(&BTRFS_I(inode)->location, &location, | |
504 | sizeof(location)); | |
505 | btrfs_read_locked_inode(inode); | |
506 | unlock_new_inode(inode); | |
507 | } | |
e20d96d6 CM |
508 | } |
509 | return d_splice_alias(inode, dentry); | |
510 | } | |
511 | ||
512 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
513 | { | |
514 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 515 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
516 | struct btrfs_item *item; |
517 | struct btrfs_dir_item *di; | |
518 | struct btrfs_key key; | |
5caf2a00 | 519 | struct btrfs_path *path; |
e20d96d6 CM |
520 | int ret; |
521 | u32 nritems; | |
522 | struct btrfs_leaf *leaf; | |
523 | int slot; | |
524 | int advance; | |
525 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 526 | int over = 0; |
70b2befd | 527 | int key_type = BTRFS_DIR_ITEM_KEY; |
d6e4a428 CM |
528 | |
529 | /* FIXME, use a real flag for deciding about the key type */ | |
530 | if (root->fs_info->tree_root == root) | |
531 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 532 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 533 | key.objectid = inode->i_ino; |
e20d96d6 | 534 | key.flags = 0; |
d6e4a428 | 535 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 536 | key.offset = filp->f_pos; |
5caf2a00 CM |
537 | path = btrfs_alloc_path(); |
538 | btrfs_init_path(path); | |
539 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 540 | if (ret < 0) |
e20d96d6 | 541 | goto err; |
7f5c1516 | 542 | advance = 0; |
e20d96d6 | 543 | while(1) { |
5caf2a00 | 544 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 545 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 546 | slot = path->slots[0]; |
dee26a9f CM |
547 | if (advance || slot >= nritems) { |
548 | if (slot >= nritems -1) { | |
5caf2a00 | 549 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
550 | if (ret) |
551 | break; | |
5caf2a00 | 552 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 553 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 554 | slot = path->slots[0]; |
e20d96d6 CM |
555 | } else { |
556 | slot++; | |
5caf2a00 | 557 | path->slots[0]++; |
e20d96d6 CM |
558 | } |
559 | } | |
560 | advance = 1; | |
561 | item = leaf->items + slot; | |
e20d96d6 CM |
562 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
563 | break; | |
d6e4a428 | 564 | if (btrfs_disk_key_type(&item->key) != key_type) |
e20d96d6 | 565 | continue; |
7f5c1516 CM |
566 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
567 | continue; | |
7fcde0e3 | 568 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 569 | advance = 1; |
e20d96d6 | 570 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
e20d96d6 CM |
571 | over = filldir(dirent, (const char *)(di + 1), |
572 | btrfs_dir_name_len(di), | |
573 | btrfs_disk_key_offset(&item->key), | |
d6e4a428 | 574 | btrfs_disk_key_objectid(&di->location), d_type); |
7fcde0e3 CM |
575 | if (over) |
576 | goto nopos; | |
e20d96d6 | 577 | } |
7fcde0e3 CM |
578 | filp->f_pos++; |
579 | nopos: | |
e20d96d6 CM |
580 | ret = 0; |
581 | err: | |
5caf2a00 CM |
582 | btrfs_release_path(root, path); |
583 | btrfs_free_path(path); | |
22b0ebda | 584 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
585 | return ret; |
586 | } | |
587 | ||
588 | static void btrfs_put_super (struct super_block * sb) | |
589 | { | |
590 | struct btrfs_root *root = btrfs_sb(sb); | |
591 | int ret; | |
592 | ||
593 | ret = close_ctree(root); | |
594 | if (ret) { | |
595 | printk("close ctree returns %d\n", ret); | |
596 | } | |
597 | sb->s_fs_info = NULL; | |
598 | } | |
2e635a27 CM |
599 | |
600 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
601 | { | |
602 | struct inode * inode; | |
e20d96d6 CM |
603 | struct dentry * root_dentry; |
604 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 605 | struct btrfs_root *tree_root; |
d6e4a428 | 606 | struct btrfs_inode *bi; |
2e635a27 CM |
607 | |
608 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 609 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 610 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 611 | sb->s_time_gran = 1; |
e20d96d6 | 612 | |
0f7d52f4 | 613 | tree_root = open_ctree(sb); |
d98237b3 | 614 | |
0f7d52f4 | 615 | if (!tree_root) { |
e20d96d6 CM |
616 | printk("btrfs: open_ctree failed\n"); |
617 | return -EIO; | |
618 | } | |
0f7d52f4 CM |
619 | sb->s_fs_info = tree_root; |
620 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
621 | printk("read in super total blocks %Lu root %Lu\n", |
622 | btrfs_super_total_blocks(disk_super), | |
623 | btrfs_super_root_dir(disk_super)); | |
624 | ||
c5739bba CM |
625 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
626 | tree_root); | |
d6e4a428 CM |
627 | bi = BTRFS_I(inode); |
628 | bi->location.objectid = inode->i_ino; | |
629 | bi->location.offset = 0; | |
630 | bi->location.flags = 0; | |
0f7d52f4 | 631 | bi->root = tree_root; |
d6e4a428 CM |
632 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
633 | ||
2e635a27 CM |
634 | if (!inode) |
635 | return -ENOMEM; | |
e20d96d6 CM |
636 | if (inode->i_state & I_NEW) { |
637 | btrfs_read_locked_inode(inode); | |
638 | unlock_new_inode(inode); | |
639 | } | |
2e635a27 | 640 | |
e20d96d6 CM |
641 | root_dentry = d_alloc_root(inode); |
642 | if (!root_dentry) { | |
2e635a27 CM |
643 | iput(inode); |
644 | return -ENOMEM; | |
645 | } | |
e20d96d6 CM |
646 | sb->s_root = root_dentry; |
647 | ||
2e635a27 CM |
648 | return 0; |
649 | } | |
650 | ||
d5719762 CM |
651 | static void fill_inode_item(struct btrfs_inode_item *item, |
652 | struct inode *inode) | |
653 | { | |
654 | btrfs_set_inode_uid(item, inode->i_uid); | |
655 | btrfs_set_inode_gid(item, inode->i_gid); | |
656 | btrfs_set_inode_size(item, inode->i_size); | |
657 | btrfs_set_inode_mode(item, inode->i_mode); | |
658 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
659 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
660 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
661 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
662 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
663 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
664 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
665 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
666 | btrfs_set_inode_generation(item, inode->i_generation); | |
667 | } | |
668 | ||
4730a4bc CM |
669 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
670 | struct btrfs_root *root, | |
671 | struct inode *inode) | |
672 | { | |
673 | struct btrfs_inode_item *inode_item; | |
5caf2a00 | 674 | struct btrfs_path *path; |
4730a4bc CM |
675 | int ret; |
676 | ||
5caf2a00 CM |
677 | path = btrfs_alloc_path(); |
678 | BUG_ON(!path); | |
679 | btrfs_init_path(path); | |
d6e4a428 CM |
680 | ret = btrfs_lookup_inode(trans, root, path, |
681 | &BTRFS_I(inode)->location, 1); | |
4730a4bc CM |
682 | if (ret) { |
683 | if (ret > 0) | |
684 | ret = -ENOENT; | |
685 | goto failed; | |
686 | } | |
687 | ||
5caf2a00 CM |
688 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
689 | path->slots[0], | |
4730a4bc CM |
690 | struct btrfs_inode_item); |
691 | ||
692 | fill_inode_item(inode_item, inode); | |
5caf2a00 | 693 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1b05da2e | 694 | ret = 0; |
4730a4bc | 695 | failed: |
5caf2a00 CM |
696 | btrfs_release_path(root, path); |
697 | btrfs_free_path(path); | |
1b05da2e | 698 | return ret; |
4730a4bc CM |
699 | } |
700 | ||
701 | static int btrfs_write_inode(struct inode *inode, int wait) | |
702 | { | |
d6e4a428 | 703 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc CM |
704 | struct btrfs_trans_handle *trans; |
705 | int ret; | |
706 | ||
707 | mutex_lock(&root->fs_info->fs_mutex); | |
708 | trans = btrfs_start_transaction(root, 1); | |
709 | ret = btrfs_update_inode(trans, root, inode); | |
710 | if (wait) | |
711 | btrfs_commit_transaction(trans, root); | |
712 | else | |
713 | btrfs_end_transaction(trans, root); | |
714 | mutex_unlock(&root->fs_info->fs_mutex); | |
715 | return ret; | |
716 | } | |
717 | ||
d5719762 | 718 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f CM |
719 | struct btrfs_root *root, |
720 | u64 objectid, int mode) | |
d5719762 CM |
721 | { |
722 | struct inode *inode; | |
723 | struct btrfs_inode_item inode_item; | |
1b05da2e | 724 | struct btrfs_key *location; |
d5719762 | 725 | int ret; |
d5719762 | 726 | |
2619ba1f | 727 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
728 | if (!inode) |
729 | return ERR_PTR(-ENOMEM); | |
730 | ||
2619ba1f | 731 | BTRFS_I(inode)->root = root; |
d5719762 CM |
732 | |
733 | inode->i_uid = current->fsuid; | |
734 | inode->i_gid = current->fsgid; | |
735 | inode->i_mode = mode; | |
736 | inode->i_ino = objectid; | |
737 | inode->i_blocks = 0; | |
c5739bba | 738 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 739 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
740 | location = &BTRFS_I(inode)->location; |
741 | location->objectid = objectid; | |
742 | location->flags = 0; | |
743 | location->offset = 0; | |
744 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
745 | |
746 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
747 | BUG_ON(ret); | |
748 | ||
749 | insert_inode_hash(inode); | |
d5719762 CM |
750 | return inode; |
751 | } | |
752 | ||
753 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
754 | struct dentry *dentry, struct inode *inode) | |
755 | { | |
756 | int ret; | |
d6e4a428 CM |
757 | struct btrfs_key key; |
758 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
759 | key.objectid = inode->i_ino; | |
760 | key.flags = 0; | |
761 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
762 | key.offset = 0; | |
763 | ||
764 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
765 | dentry->d_name.name, dentry->d_name.len, |
766 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 767 | &key, 0); |
4730a4bc | 768 | if (ret == 0) { |
5f26f772 | 769 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 770 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
771 | dentry->d_parent->d_inode); |
772 | } | |
d5719762 CM |
773 | return ret; |
774 | } | |
775 | ||
776 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
777 | struct dentry *dentry, struct inode *inode) | |
778 | { | |
779 | int err = btrfs_add_link(trans, dentry, inode); | |
780 | if (!err) { | |
781 | d_instantiate(dentry, inode); | |
782 | return 0; | |
783 | } | |
2c90e5d6 CM |
784 | if (err > 0) |
785 | err = -EEXIST; | |
d5719762 CM |
786 | return err; |
787 | } | |
788 | ||
789 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
790 | int mode, struct nameidata *nd) | |
791 | { | |
792 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 793 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
794 | struct inode *inode; |
795 | int err; | |
134e9731 | 796 | int drop_inode = 0; |
2619ba1f | 797 | u64 objectid; |
d5719762 | 798 | |
d561c025 | 799 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 800 | trans = btrfs_start_transaction(root, 1); |
2619ba1f CM |
801 | |
802 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
803 | if (err) { | |
804 | err = -ENOSPC; | |
805 | goto out_unlock; | |
806 | } | |
807 | ||
808 | inode = btrfs_new_inode(trans, root, objectid, mode); | |
d5719762 CM |
809 | err = PTR_ERR(inode); |
810 | if (IS_ERR(inode)) | |
d561c025 | 811 | goto out_unlock; |
d5719762 CM |
812 | // FIXME mark the inode dirty |
813 | err = btrfs_add_nondir(trans, dentry, inode); | |
134e9731 CM |
814 | if (err) |
815 | drop_inode = 1; | |
dee26a9f CM |
816 | else { |
817 | inode->i_mapping->a_ops = &btrfs_aops; | |
818 | inode->i_fop = &btrfs_file_operations; | |
819 | inode->i_op = &btrfs_file_inode_operations; | |
820 | } | |
d5719762 | 821 | dir->i_sb->s_dirt = 1; |
d561c025 | 822 | out_unlock: |
22b0ebda | 823 | btrfs_end_transaction(trans, root); |
d561c025 | 824 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 825 | |
134e9731 CM |
826 | if (drop_inode) { |
827 | inode_dec_link_count(inode); | |
828 | iput(inode); | |
829 | } | |
d5719762 CM |
830 | return err; |
831 | } | |
832 | ||
f7922033 | 833 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
834 | struct btrfs_root *root, |
835 | u64 objectid, u64 dirid) | |
f7922033 | 836 | { |
f7922033 CM |
837 | int ret; |
838 | char buf[2]; | |
d6e4a428 CM |
839 | struct btrfs_key key; |
840 | ||
f7922033 CM |
841 | buf[0] = '.'; |
842 | buf[1] = '.'; | |
843 | ||
2619ba1f | 844 | key.objectid = objectid; |
d6e4a428 CM |
845 | key.offset = 0; |
846 | key.flags = 0; | |
847 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
848 | ||
2619ba1f | 849 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 850 | &key, 1); |
f7922033 CM |
851 | if (ret) |
852 | goto error; | |
2619ba1f CM |
853 | key.objectid = dirid; |
854 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 855 | &key, 1); |
4730a4bc CM |
856 | if (ret) |
857 | goto error; | |
f7922033 CM |
858 | error: |
859 | return ret; | |
860 | } | |
861 | ||
862 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
863 | { | |
864 | struct inode *inode; | |
865 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 866 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
867 | int err = 0; |
868 | int drop_on_err = 0; | |
2619ba1f | 869 | u64 objectid; |
f7922033 CM |
870 | |
871 | mutex_lock(&root->fs_info->fs_mutex); | |
872 | trans = btrfs_start_transaction(root, 1); | |
873 | if (IS_ERR(trans)) { | |
874 | err = PTR_ERR(trans); | |
875 | goto out_unlock; | |
876 | } | |
2619ba1f CM |
877 | |
878 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
879 | if (err) { | |
880 | err = -ENOSPC; | |
881 | goto out_unlock; | |
882 | } | |
883 | ||
884 | inode = btrfs_new_inode(trans, root, objectid, S_IFDIR | mode); | |
f7922033 CM |
885 | if (IS_ERR(inode)) { |
886 | err = PTR_ERR(inode); | |
887 | goto out_fail; | |
888 | } | |
889 | drop_on_err = 1; | |
890 | inode->i_op = &btrfs_dir_inode_operations; | |
891 | inode->i_fop = &btrfs_dir_file_operations; | |
892 | ||
2619ba1f CM |
893 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
894 | if (err) | |
895 | goto out_fail; | |
896 | ||
897 | inode->i_size = 6; | |
898 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
899 | if (err) |
900 | goto out_fail; | |
901 | err = btrfs_add_link(trans, dentry, inode); | |
902 | if (err) | |
903 | goto out_fail; | |
904 | d_instantiate(dentry, inode); | |
f7922033 CM |
905 | drop_on_err = 0; |
906 | ||
907 | out_fail: | |
908 | btrfs_end_transaction(trans, root); | |
909 | out_unlock: | |
910 | mutex_unlock(&root->fs_info->fs_mutex); | |
911 | if (drop_on_err) | |
912 | iput(inode); | |
913 | return err; | |
914 | } | |
915 | ||
d5719762 CM |
916 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
917 | { | |
918 | struct btrfs_trans_handle *trans; | |
919 | struct btrfs_root *root; | |
920 | int ret; | |
d98237b3 | 921 | root = btrfs_sb(sb); |
df2ce34c | 922 | |
d5719762 | 923 | sb->s_dirt = 0; |
d561c025 | 924 | if (!wait) { |
7cfcc17e | 925 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
926 | return 0; |
927 | } | |
7cfcc17e | 928 | filemap_write_and_wait(root->fs_info->btree_inode->i_mapping); |
d561c025 | 929 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
930 | trans = btrfs_start_transaction(root, 1); |
931 | ret = btrfs_commit_transaction(trans, root); | |
932 | sb->s_dirt = 0; | |
933 | BUG_ON(ret); | |
934 | printk("btrfs sync_fs\n"); | |
d561c025 | 935 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
936 | return 0; |
937 | } | |
938 | ||
e8f05c45 | 939 | #if 0 |
df24a2b9 CM |
940 | static int btrfs_get_block_inline(struct inode *inode, sector_t iblock, |
941 | struct buffer_head *result, int create) | |
942 | { | |
943 | struct btrfs_root *root = btrfs_sb(inode->i_sb); | |
944 | struct btrfs_path *path; | |
945 | struct btrfs_key key; | |
946 | struct btrfs_leaf *leaf; | |
947 | int num_bytes = result->b_size; | |
948 | int item_size; | |
949 | int ret; | |
950 | u64 pos; | |
951 | char *ptr; | |
952 | int copy_size; | |
953 | int err = 0; | |
954 | char *safe_ptr; | |
955 | char *data_ptr; | |
956 | ||
957 | path = btrfs_alloc_path(); | |
958 | BUG_ON(!path); | |
959 | ||
960 | WARN_ON(create); | |
961 | if (create) { | |
962 | return 0; | |
963 | } | |
964 | pos = iblock << inode->i_blkbits; | |
965 | key.objectid = inode->i_ino; | |
966 | key.flags = 0; | |
967 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); | |
968 | ptr = kmap(result->b_page); | |
969 | safe_ptr = ptr; | |
970 | ptr += (pos & (PAGE_CACHE_SIZE -1)); | |
971 | again: | |
972 | key.offset = pos; | |
973 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
974 | if (ret) { | |
975 | if (ret < 0) | |
976 | err = ret; | |
977 | else | |
978 | err = 0; | |
979 | goto out; | |
980 | } | |
981 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
982 | item_size = btrfs_item_size(leaf->items + path->slots[0]); | |
983 | copy_size = min(num_bytes, item_size); | |
984 | data_ptr = btrfs_item_ptr(leaf, path->slots[0], char); | |
985 | WARN_ON(safe_ptr + PAGE_CACHE_SIZE < ptr + copy_size); | |
986 | memcpy(ptr, data_ptr, copy_size); | |
987 | pos += copy_size; | |
988 | num_bytes -= copy_size; | |
989 | WARN_ON(num_bytes < 0); | |
990 | ptr += copy_size; | |
991 | btrfs_release_path(root, path); | |
992 | if (num_bytes != 0) { | |
993 | if (pos >= i_size_read(inode)) | |
994 | memset(ptr, 0, num_bytes); | |
995 | else | |
996 | goto again; | |
997 | } | |
998 | set_buffer_uptodate(result); | |
999 | map_bh(result, inode->i_sb, 0); | |
1000 | err = 0; | |
1001 | out: | |
1002 | btrfs_free_path(path); | |
1003 | kunmap(result->b_page); | |
1004 | return err; | |
1005 | } | |
e8f05c45 | 1006 | #endif |
df24a2b9 | 1007 | |
75dfe396 | 1008 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1009 | struct buffer_head *result, int create) |
1010 | { | |
1011 | int ret; | |
1012 | int err = 0; | |
1013 | u64 blocknr; | |
1014 | u64 extent_start = 0; | |
1015 | u64 extent_end = 0; | |
1016 | u64 objectid = inode->i_ino; | |
5caf2a00 | 1017 | struct btrfs_path *path; |
d6e4a428 | 1018 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1019 | struct btrfs_trans_handle *trans = NULL; |
1020 | struct btrfs_file_extent_item *item; | |
1021 | struct btrfs_leaf *leaf; | |
1022 | struct btrfs_disk_key *found_key; | |
1023 | ||
5caf2a00 CM |
1024 | path = btrfs_alloc_path(); |
1025 | BUG_ON(!path); | |
1026 | btrfs_init_path(path); | |
6567e837 | 1027 | if (create) { |
dee26a9f | 1028 | trans = btrfs_start_transaction(root, 1); |
6567e837 CM |
1029 | WARN_ON(1); |
1030 | } | |
dee26a9f | 1031 | |
5caf2a00 | 1032 | ret = btrfs_lookup_file_extent(trans, root, path, |
9773a788 | 1033 | inode->i_ino, |
79b2cb1f | 1034 | iblock << inode->i_blkbits, create); |
dee26a9f | 1035 | if (ret < 0) { |
dee26a9f CM |
1036 | err = ret; |
1037 | goto out; | |
1038 | } | |
1039 | ||
1040 | if (ret != 0) { | |
5caf2a00 CM |
1041 | if (path->slots[0] == 0) { |
1042 | btrfs_release_path(root, path); | |
dee26a9f CM |
1043 | goto allocate; |
1044 | } | |
5caf2a00 | 1045 | path->slots[0]--; |
dee26a9f CM |
1046 | } |
1047 | ||
5caf2a00 | 1048 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1049 | struct btrfs_file_extent_item); |
5caf2a00 | 1050 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1051 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1052 | blocknr += btrfs_file_extent_offset(item); | |
1053 | ||
48ddc6f4 CM |
1054 | /* exact match found, use it, FIXME, deal with extents |
1055 | * other than the page size | |
1056 | */ | |
6567e837 | 1057 | if (0 && ret == 0) { |
dee26a9f | 1058 | err = 0; |
79b2cb1f CM |
1059 | if (create && |
1060 | btrfs_file_extent_generation(item) != trans->transid) { | |
48ddc6f4 CM |
1061 | struct btrfs_key ins; |
1062 | ret = btrfs_alloc_extent(trans, root, 1, | |
1063 | blocknr, (u64)-1, &ins); | |
1064 | BUG_ON(ret); | |
1065 | btrfs_set_file_extent_disk_blocknr(item, ins.objectid); | |
1066 | mark_buffer_dirty(path->nodes[0]); | |
1067 | ret = btrfs_free_extent(trans, root, | |
1068 | blocknr, 1, 0); | |
1069 | BUG_ON(ret); | |
1070 | blocknr = ins.objectid; | |
1071 | ||
1072 | } | |
8352d8a4 | 1073 | btrfs_map_bh_to_logical(root, result, blocknr); |
dee26a9f CM |
1074 | goto out; |
1075 | } | |
1076 | ||
1077 | /* are we inside the extent that was found? */ | |
5caf2a00 | 1078 | found_key = &leaf->items[path->slots[0]].key; |
dee26a9f CM |
1079 | if (btrfs_disk_key_objectid(found_key) != objectid || |
1080 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) { | |
1081 | extent_end = 0; | |
1082 | extent_start = 0; | |
5caf2a00 | 1083 | btrfs_release_path(root, path); |
dee26a9f CM |
1084 | goto allocate; |
1085 | } | |
1086 | ||
5caf2a00 | 1087 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); |
9773a788 | 1088 | extent_start = extent_start >> inode->i_blkbits; |
dee26a9f | 1089 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); |
dee26a9f CM |
1090 | if (iblock >= extent_start && iblock < extent_end) { |
1091 | err = 0; | |
8352d8a4 CM |
1092 | btrfs_map_bh_to_logical(root, result, blocknr + iblock - |
1093 | extent_start); | |
dee26a9f CM |
1094 | goto out; |
1095 | } | |
1096 | allocate: | |
1097 | /* ok, create a new extent */ | |
1098 | if (!create) { | |
1099 | err = 0; | |
1100 | goto out; | |
1101 | } | |
b18c6685 | 1102 | #if 0 |
9773a788 CM |
1103 | ret = btrfs_alloc_file_extent(trans, root, objectid, |
1104 | iblock << inode->i_blkbits, | |
dee26a9f CM |
1105 | 1, extent_end, &blocknr); |
1106 | if (ret) { | |
1107 | err = ret; | |
1108 | goto out; | |
1109 | } | |
f4b9aa8d CM |
1110 | inode->i_blocks += inode->i_sb->s_blocksize >> 9; |
1111 | set_buffer_new(result); | |
dee26a9f CM |
1112 | map_bh(result, inode->i_sb, blocknr); |
1113 | ||
8352d8a4 | 1114 | btrfs_map_bh_to_logical(root, result, blocknr); |
b18c6685 | 1115 | #endif |
dee26a9f | 1116 | out: |
5caf2a00 CM |
1117 | btrfs_release_path(root, path); |
1118 | btrfs_free_path(path); | |
dee26a9f CM |
1119 | if (trans) |
1120 | btrfs_end_transaction(trans, root); | |
75dfe396 CM |
1121 | return err; |
1122 | } | |
1123 | ||
1124 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1125 | struct buffer_head *result, int create) | |
1126 | { | |
1127 | int err; | |
d6e4a428 | 1128 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1129 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 CM |
1130 | err = btrfs_get_block_lock(inode, iblock, result, create); |
1131 | // err = btrfs_get_block_inline(inode, iblock, result, create); | |
dee26a9f CM |
1132 | mutex_unlock(&root->fs_info->fs_mutex); |
1133 | return err; | |
1134 | } | |
1135 | ||
1136 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1137 | unsigned from, unsigned to) | |
1138 | { | |
6407bf6d | 1139 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f | 1140 | } |
75dfe396 CM |
1141 | static int btrfs_commit_write(struct file *file, struct page *page, |
1142 | unsigned from, unsigned to) | |
1143 | { | |
75dfe396 CM |
1144 | return nobh_commit_write(file, page, from, to); |
1145 | } | |
dee26a9f | 1146 | |
d561c025 CM |
1147 | static void btrfs_write_super(struct super_block *sb) |
1148 | { | |
1149 | btrfs_sync_fs(sb, 1); | |
1150 | } | |
1151 | ||
dee26a9f CM |
1152 | static int btrfs_readpage(struct file *file, struct page *page) |
1153 | { | |
1154 | return mpage_readpage(page, btrfs_get_block); | |
1155 | } | |
1156 | ||
dee26a9f CM |
1157 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1158 | { | |
6407bf6d | 1159 | return nobh_writepage(page, btrfs_get_block, wbc); |
dee26a9f | 1160 | } |
d561c025 | 1161 | |
f4b9aa8d CM |
1162 | static void btrfs_truncate(struct inode *inode) |
1163 | { | |
d6e4a428 | 1164 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1165 | int ret; |
1166 | struct btrfs_trans_handle *trans; | |
1167 | ||
1168 | if (!S_ISREG(inode->i_mode)) | |
1169 | return; | |
1170 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1171 | return; | |
1172 | ||
e8f05c45 | 1173 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1174 | |
1175 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1176 | mutex_lock(&root->fs_info->fs_mutex); | |
1177 | trans = btrfs_start_transaction(root, 1); | |
1178 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
1179 | BUG_ON(ret); | |
1180 | ret = btrfs_end_transaction(trans, root); | |
1181 | BUG_ON(ret); | |
1182 | mutex_unlock(&root->fs_info->fs_mutex); | |
1183 | mark_inode_dirty(inode); | |
1184 | } | |
1185 | ||
75dfe396 CM |
1186 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1187 | struct page **prepared_pages, | |
1188 | const char __user * buf) | |
1189 | { | |
1190 | long page_fault = 0; | |
1191 | int i; | |
1192 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1193 | ||
1194 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1195 | size_t count = min_t(size_t, | |
1196 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1197 | struct page *page = prepared_pages[i]; | |
1198 | fault_in_pages_readable(buf, count); | |
1199 | ||
1200 | /* Copy data from userspace to the current page */ | |
1201 | kmap(page); | |
1202 | page_fault = __copy_from_user(page_address(page) + offset, | |
1203 | buf, count); | |
1204 | /* Flush processor's dcache for this page */ | |
1205 | flush_dcache_page(page); | |
1206 | kunmap(page); | |
1207 | buf += count; | |
1208 | write_bytes -= count; | |
1209 | ||
1210 | if (page_fault) | |
1211 | break; | |
1212 | } | |
1213 | return page_fault ? -EFAULT : 0; | |
1214 | } | |
1215 | ||
1216 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1217 | { | |
1218 | size_t i; | |
1219 | for (i = 0; i < num_pages; i++) { | |
1220 | if (!pages[i]) | |
1221 | break; | |
1222 | unlock_page(pages[i]); | |
1223 | mark_page_accessed(pages[i]); | |
1224 | page_cache_release(pages[i]); | |
1225 | } | |
1226 | } | |
1227 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1228 | struct btrfs_root *root, | |
1229 | struct file *file, | |
1230 | struct page **pages, | |
1231 | size_t num_pages, | |
1232 | loff_t pos, | |
1233 | size_t write_bytes) | |
1234 | { | |
1235 | int i; | |
1236 | int offset; | |
1237 | int err = 0; | |
1238 | int ret; | |
1239 | int this_write; | |
f254e52c | 1240 | struct inode *inode = file->f_path.dentry->d_inode; |
75dfe396 CM |
1241 | |
1242 | for (i = 0; i < num_pages; i++) { | |
1243 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1244 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1245 | /* FIXME, one block at a time */ |
1246 | ||
1247 | mutex_lock(&root->fs_info->fs_mutex); | |
1248 | trans = btrfs_start_transaction(root, 1); | |
1249 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
1250 | pages[i]->index << PAGE_CACHE_SHIFT, | |
1251 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
1252 | kunmap(pages[i]); | |
1253 | SetPageChecked(pages[i]); | |
1254 | ret = btrfs_end_transaction(trans, root); | |
1255 | BUG_ON(ret); | |
1256 | mutex_unlock(&root->fs_info->fs_mutex); | |
1257 | ||
75dfe396 CM |
1258 | ret = nobh_commit_write(file, pages[i], offset, |
1259 | offset + this_write); | |
1260 | pos += this_write; | |
1261 | if (ret) { | |
1262 | err = ret; | |
1263 | goto failed; | |
1264 | } | |
1265 | WARN_ON(this_write > write_bytes); | |
1266 | write_bytes -= this_write; | |
1267 | } | |
1268 | failed: | |
1269 | return err; | |
1270 | } | |
1271 | ||
b18c6685 CM |
1272 | static int drop_extents(struct btrfs_trans_handle *trans, |
1273 | struct btrfs_root *root, | |
1274 | struct inode *inode, | |
1275 | u64 start, u64 end) | |
1276 | { | |
1277 | int ret; | |
1278 | struct btrfs_key key; | |
1279 | struct btrfs_leaf *leaf; | |
1280 | int slot; | |
1281 | struct btrfs_file_extent_item *extent; | |
1282 | u64 extent_end; | |
1283 | int keep; | |
1284 | struct btrfs_file_extent_item old; | |
1285 | struct btrfs_path *path; | |
1286 | u64 search_start = start; | |
1287 | int bookend; | |
1288 | ||
1289 | path = btrfs_alloc_path(); | |
1290 | if (!path) | |
1291 | return -ENOMEM; | |
1292 | search_again: | |
b18c6685 CM |
1293 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, |
1294 | search_start, -1); | |
70b2befd | 1295 | if (ret < 0) |
b18c6685 | 1296 | goto out; |
70b2befd CM |
1297 | if (ret > 0) { |
1298 | if (path->slots[0] == 0) { | |
1299 | ret = -ENOENT; | |
1300 | goto out; | |
1301 | } | |
1302 | path->slots[0]--; | |
b18c6685 CM |
1303 | } |
1304 | while(1) { | |
1305 | keep = 0; | |
1306 | bookend = 0; | |
1307 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1308 | slot = path->slots[0]; | |
1309 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
1310 | ||
b18c6685 CM |
1311 | extent = btrfs_item_ptr(leaf, slot, |
1312 | struct btrfs_file_extent_item); | |
1313 | extent_end = key.offset + | |
1314 | (btrfs_file_extent_num_blocks(extent) << | |
1315 | inode->i_blkbits); | |
b18c6685 CM |
1316 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1317 | ret = 0; | |
1318 | goto out; | |
1319 | } | |
1320 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) | |
1321 | goto next_leaf; | |
1322 | ||
1323 | if (end < extent_end && end >= key.offset) { | |
1324 | memcpy(&old, extent, sizeof(old)); | |
1325 | ret = btrfs_inc_extent_ref(trans, root, | |
1326 | btrfs_file_extent_disk_blocknr(&old), | |
1327 | btrfs_file_extent_disk_num_blocks(&old)); | |
1328 | BUG_ON(ret); | |
1329 | bookend = 1; | |
1330 | } | |
1331 | ||
1332 | if (start > key.offset) { | |
1333 | u64 new_num; | |
1334 | /* truncate existing extent */ | |
1335 | keep = 1; | |
1336 | WARN_ON(start & (root->blocksize - 1)); | |
1337 | new_num = (start - key.offset) >> inode->i_blkbits; | |
b18c6685 | 1338 | btrfs_set_file_extent_num_blocks(extent, new_num); |
b18c6685 CM |
1339 | mark_buffer_dirty(path->nodes[0]); |
1340 | } | |
1341 | if (!keep) { | |
1342 | u64 disk_blocknr; | |
1343 | u64 disk_num_blocks; | |
b18c6685 CM |
1344 | disk_blocknr = btrfs_file_extent_disk_blocknr(extent); |
1345 | disk_num_blocks = | |
1346 | btrfs_file_extent_disk_num_blocks(extent); | |
1347 | search_start = key.offset + | |
1348 | (btrfs_file_extent_num_blocks(extent) << | |
1349 | inode->i_blkbits); | |
1350 | ret = btrfs_del_item(trans, root, path); | |
1351 | BUG_ON(ret); | |
1352 | btrfs_release_path(root, path); | |
1353 | ||
1354 | ret = btrfs_free_extent(trans, root, disk_blocknr, | |
1355 | disk_num_blocks, 0); | |
1356 | ||
1357 | BUG_ON(ret); | |
1358 | if (!bookend && search_start >= end) { | |
1359 | ret = 0; | |
1360 | goto out; | |
1361 | } | |
1362 | if (!bookend) | |
1363 | goto search_again; | |
1364 | } | |
1365 | if (bookend) { | |
1366 | /* create bookend */ | |
1367 | struct btrfs_key ins; | |
b18c6685 CM |
1368 | ins.objectid = inode->i_ino; |
1369 | ins.offset = end; | |
1370 | ins.flags = 0; | |
1371 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1372 | ||
1373 | btrfs_release_path(root, path); | |
b18c6685 CM |
1374 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1375 | sizeof(*extent)); | |
1376 | BUG_ON(ret); | |
1377 | extent = btrfs_item_ptr( | |
1378 | btrfs_buffer_leaf(path->nodes[0]), | |
1379 | path->slots[0], | |
1380 | struct btrfs_file_extent_item); | |
1381 | btrfs_set_file_extent_disk_blocknr(extent, | |
1382 | btrfs_file_extent_disk_blocknr(&old)); | |
1383 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1384 | btrfs_file_extent_disk_num_blocks(&old)); | |
1385 | ||
1386 | btrfs_set_file_extent_offset(extent, | |
1387 | btrfs_file_extent_offset(&old) + | |
1388 | ((end - key.offset) >> inode->i_blkbits)); | |
1389 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
1390 | (end - key.offset) >> inode->i_blkbits); | |
1391 | btrfs_set_file_extent_num_blocks(extent, | |
1392 | btrfs_file_extent_num_blocks(&old) - | |
1393 | ((end - key.offset) >> inode->i_blkbits)); | |
1394 | ||
1395 | btrfs_set_file_extent_generation(extent, | |
1396 | btrfs_file_extent_generation(&old)); | |
b18c6685 CM |
1397 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1398 | ret = 0; | |
70b2befd | 1399 | goto out; |
b18c6685 CM |
1400 | } |
1401 | next_leaf: | |
1402 | if (slot >= btrfs_header_nritems(&leaf->header) - 1) { | |
1403 | ret = btrfs_next_leaf(root, path); | |
1404 | if (ret) { | |
1405 | ret = 0; | |
1406 | goto out; | |
1407 | } | |
1408 | } else { | |
1409 | path->slots[0]++; | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | out: | |
b18c6685 CM |
1414 | btrfs_free_path(path); |
1415 | return ret; | |
1416 | } | |
1417 | ||
1418 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1419 | struct file *file, |
1420 | struct page **pages, | |
1421 | size_t num_pages, | |
1422 | loff_t pos, | |
2932f3ec CM |
1423 | unsigned long first_index, |
1424 | unsigned long last_index, | |
6567e837 CM |
1425 | size_t write_bytes, |
1426 | u64 alloc_extent_start) | |
75dfe396 CM |
1427 | { |
1428 | int i; | |
1429 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1430 | struct inode *inode = file->f_path.dentry->d_inode; | |
1431 | int offset; | |
1432 | int err = 0; | |
75dfe396 | 1433 | int this_write; |
6567e837 CM |
1434 | struct buffer_head *bh; |
1435 | struct buffer_head *head; | |
75dfe396 CM |
1436 | loff_t isize = i_size_read(inode); |
1437 | ||
1438 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1439 | ||
1440 | for (i = 0; i < num_pages; i++) { | |
1441 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1442 | if (!pages[i]) { | |
1443 | err = -ENOMEM; | |
1444 | goto failed_release; | |
1445 | } | |
1446 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1447 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
b18c6685 CM |
1448 | #if 0 |
1449 | if ((pages[i]->index == first_index || | |
1450 | pages[i]->index == last_index) && pos < isize && | |
1451 | !PageUptodate(pages[i])) { | |
2932f3ec CM |
1452 | ret = mpage_readpage(pages[i], btrfs_get_block); |
1453 | BUG_ON(ret); | |
1454 | lock_page(pages[i]); | |
1455 | } | |
b18c6685 | 1456 | #endif |
6567e837 CM |
1457 | create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize, |
1458 | (1 << BH_Uptodate)); | |
1459 | head = page_buffers(pages[i]); | |
1460 | bh = head; | |
1461 | do { | |
1462 | err = btrfs_map_bh_to_logical(root, bh, | |
1463 | alloc_extent_start); | |
1464 | BUG_ON(err); | |
1465 | if (err) | |
1466 | goto failed_truncate; | |
1467 | bh = bh->b_this_page; | |
1468 | alloc_extent_start++; | |
1469 | } while (bh != head); | |
75dfe396 | 1470 | pos += this_write; |
75dfe396 CM |
1471 | WARN_ON(this_write > write_bytes); |
1472 | write_bytes -= this_write; | |
1473 | } | |
1474 | return 0; | |
1475 | ||
1476 | failed_release: | |
1477 | btrfs_drop_pages(pages, num_pages); | |
1478 | return err; | |
1479 | ||
1480 | failed_truncate: | |
1481 | btrfs_drop_pages(pages, num_pages); | |
1482 | if (pos > isize) | |
1483 | vmtruncate(inode, isize); | |
1484 | return err; | |
1485 | } | |
1486 | ||
1487 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1488 | size_t count, loff_t *ppos) | |
1489 | { | |
1490 | loff_t pos; | |
1491 | size_t num_written = 0; | |
1492 | int err = 0; | |
1493 | int ret = 0; | |
75dfe396 | 1494 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1495 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1496 | struct page *pages[8]; |
2932f3ec CM |
1497 | unsigned long first_index; |
1498 | unsigned long last_index; | |
6567e837 CM |
1499 | u64 start_pos; |
1500 | u64 num_blocks; | |
1501 | u64 alloc_extent_start; | |
6567e837 | 1502 | struct btrfs_trans_handle *trans; |
b18c6685 | 1503 | struct btrfs_key ins; |
75dfe396 CM |
1504 | |
1505 | if (file->f_flags & O_DIRECT) | |
1506 | return -EINVAL; | |
1507 | pos = *ppos; | |
1508 | ||
6567e837 CM |
1509 | start_pos = pos & ~(root->blocksize - 1); |
1510 | /* FIXME */ | |
1511 | if (start_pos != pos) | |
1512 | return -EINVAL; | |
1513 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1514 | inode->i_blkbits; | |
1515 | ||
75dfe396 CM |
1516 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1517 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1518 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1519 | if (err) | |
1520 | goto out; | |
1521 | if (count == 0) | |
1522 | goto out; | |
1523 | err = remove_suid(file->f_path.dentry); | |
1524 | if (err) | |
1525 | goto out; | |
1526 | file_update_time(file); | |
1527 | mutex_lock(&inode->i_mutex); | |
2932f3ec CM |
1528 | first_index = pos >> PAGE_CACHE_SHIFT; |
1529 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 CM |
1530 | |
1531 | mutex_lock(&root->fs_info->fs_mutex); | |
1532 | trans = btrfs_start_transaction(root, 1); | |
1533 | if (!trans) { | |
1534 | err = -ENOMEM; | |
b18c6685 | 1535 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
1536 | goto out_unlock; |
1537 | } | |
b18c6685 CM |
1538 | if (start_pos < inode->i_size) { |
1539 | ret = drop_extents(trans, root, inode, | |
1540 | start_pos, | |
1541 | (pos + count + root->blocksize -1) & | |
1542 | ~(root->blocksize - 1)); | |
1543 | } | |
b18c6685 CM |
1544 | ret = btrfs_alloc_extent(trans, root, num_blocks, 1, |
1545 | (u64)-1, &ins); | |
1546 | BUG_ON(ret); | |
1547 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
1548 | start_pos, ins.objectid, ins.offset); | |
6567e837 | 1549 | BUG_ON(ret); |
b18c6685 CM |
1550 | alloc_extent_start = ins.objectid; |
1551 | ret = btrfs_end_transaction(trans, root); | |
6567e837 CM |
1552 | mutex_unlock(&root->fs_info->fs_mutex); |
1553 | ||
75dfe396 CM |
1554 | while(count > 0) { |
1555 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1556 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1557 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1558 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
1559 | |
1560 | memset(pages, 0, sizeof(pages)); | |
1561 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
1562 | pos, first_index, last_index, |
1563 | write_bytes, alloc_extent_start); | |
75dfe396 | 1564 | BUG_ON(ret); |
b18c6685 | 1565 | |
6567e837 CM |
1566 | /* FIXME blocks != pagesize */ |
1567 | alloc_extent_start += num_pages; | |
75dfe396 CM |
1568 | ret = btrfs_copy_from_user(pos, num_pages, |
1569 | write_bytes, pages, buf); | |
1570 | BUG_ON(ret); | |
1571 | ||
f254e52c | 1572 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 1573 | num_pages, pos, write_bytes); |
75dfe396 CM |
1574 | BUG_ON(ret); |
1575 | btrfs_drop_pages(pages, num_pages); | |
1576 | ||
75dfe396 CM |
1577 | buf += write_bytes; |
1578 | count -= write_bytes; | |
1579 | pos += write_bytes; | |
1580 | num_written += write_bytes; | |
1581 | ||
1582 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1583 | cond_resched(); | |
1584 | } | |
6567e837 | 1585 | out_unlock: |
75dfe396 CM |
1586 | mutex_unlock(&inode->i_mutex); |
1587 | out: | |
1588 | *ppos = pos; | |
1589 | current->backing_dev_info = NULL; | |
1590 | return num_written ? num_written : err; | |
1591 | } | |
1592 | ||
e8f05c45 | 1593 | #if 0 |
df24a2b9 CM |
1594 | static ssize_t inline_one_page(struct btrfs_root *root, struct inode *inode, |
1595 | struct page *page, loff_t pos, | |
1596 | size_t offset, size_t write_bytes) | |
1597 | { | |
1598 | struct btrfs_path *path; | |
1599 | struct btrfs_trans_handle *trans; | |
1600 | struct btrfs_key key; | |
1601 | struct btrfs_leaf *leaf; | |
1602 | struct btrfs_key found_key; | |
1603 | int ret; | |
1604 | size_t copy_size = 0; | |
1605 | char *dst = NULL; | |
1606 | int err = 0; | |
1607 | size_t num_written = 0; | |
1608 | ||
1609 | path = btrfs_alloc_path(); | |
1610 | BUG_ON(!path); | |
1611 | mutex_lock(&root->fs_info->fs_mutex); | |
1612 | trans = btrfs_start_transaction(root, 1); | |
1613 | key.objectid = inode->i_ino; | |
1614 | key.flags = 0; | |
1615 | btrfs_set_key_type(&key, BTRFS_INLINE_DATA_KEY); | |
1616 | ||
1617 | again: | |
1618 | key.offset = pos; | |
1619 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); | |
1620 | if (ret < 0) { | |
1621 | err = ret; | |
1622 | goto out; | |
1623 | } | |
1624 | if (ret == 0) { | |
1625 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1626 | btrfs_disk_key_to_cpu(&found_key, | |
1627 | &leaf->items[path->slots[0]].key); | |
1628 | copy_size = btrfs_item_size(leaf->items + path->slots[0]); | |
1629 | dst = btrfs_item_ptr(leaf, path->slots[0], char); | |
1630 | copy_size = min(write_bytes, copy_size); | |
1631 | goto copyit; | |
1632 | } else { | |
1633 | int slot = path->slots[0]; | |
1634 | if (slot > 0) { | |
1635 | slot--; | |
1636 | } | |
1637 | // FIXME find max key | |
1638 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
1639 | btrfs_disk_key_to_cpu(&found_key, | |
1640 | &leaf->items[slot].key); | |
1641 | if (found_key.objectid != inode->i_ino) | |
1642 | goto insert; | |
1643 | if (btrfs_key_type(&found_key) != BTRFS_INLINE_DATA_KEY) | |
1644 | goto insert; | |
1645 | copy_size = btrfs_item_size(leaf->items + slot); | |
1646 | if (found_key.offset + copy_size <= pos) | |
1647 | goto insert; | |
1648 | dst = btrfs_item_ptr(leaf, path->slots[0], char); | |
1649 | dst += pos - found_key.offset; | |
1650 | copy_size = copy_size - (pos - found_key.offset); | |
1651 | BUG_ON(copy_size < 0); | |
1652 | copy_size = min(write_bytes, copy_size); | |
1653 | WARN_ON(copy_size == 0); | |
1654 | goto copyit; | |
1655 | } | |
1656 | insert: | |
1657 | btrfs_release_path(root, path); | |
d4dbff95 CM |
1658 | copy_size = min(write_bytes, |
1659 | (size_t)BTRFS_LEAF_DATA_SIZE(root) - | |
1660 | sizeof(struct btrfs_item) * 4); | |
df24a2b9 CM |
1661 | ret = btrfs_insert_empty_item(trans, root, path, &key, copy_size); |
1662 | BUG_ON(ret); | |
1663 | dst = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1664 | path->slots[0], char); | |
1665 | copyit: | |
1666 | WARN_ON(copy_size == 0); | |
1667 | WARN_ON(dst + copy_size > | |
1668 | btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1669 | path->slots[0], char) + | |
1670 | btrfs_item_size(btrfs_buffer_leaf(path->nodes[0])->items + | |
1671 | path->slots[0])); | |
1672 | btrfs_memcpy(root, path->nodes[0]->b_data, dst, | |
1673 | page_address(page) + offset, copy_size); | |
1674 | mark_buffer_dirty(path->nodes[0]); | |
1675 | btrfs_release_path(root, path); | |
1676 | pos += copy_size; | |
1677 | offset += copy_size; | |
1678 | num_written += copy_size; | |
1679 | write_bytes -= copy_size; | |
1680 | if (write_bytes) | |
1681 | goto again; | |
1682 | out: | |
1683 | btrfs_free_path(path); | |
1684 | ret = btrfs_end_transaction(trans, root); | |
1685 | BUG_ON(ret); | |
1686 | mutex_unlock(&root->fs_info->fs_mutex); | |
1687 | return num_written ? num_written : err; | |
1688 | } | |
1689 | ||
1690 | static ssize_t btrfs_file_inline_write(struct file *file, | |
1691 | const char __user *buf, | |
1692 | size_t count, loff_t *ppos) | |
1693 | { | |
1694 | loff_t pos; | |
1695 | size_t num_written = 0; | |
1696 | int err = 0; | |
1697 | int ret = 0; | |
1698 | struct inode *inode = file->f_path.dentry->d_inode; | |
d6e4a428 | 1699 | struct btrfs_root *root = BTRFS_I(inode)->root; |
df24a2b9 CM |
1700 | unsigned long page_index; |
1701 | ||
1702 | if (file->f_flags & O_DIRECT) | |
1703 | return -EINVAL; | |
1704 | pos = *ppos; | |
1705 | ||
1706 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); | |
1707 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1708 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1709 | if (err) | |
1710 | goto out; | |
1711 | if (count == 0) | |
1712 | goto out; | |
1713 | err = remove_suid(file->f_path.dentry); | |
1714 | if (err) | |
1715 | goto out; | |
1716 | file_update_time(file); | |
1717 | mutex_lock(&inode->i_mutex); | |
1718 | while(count > 0) { | |
1719 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1720 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1721 | struct page *page; | |
1722 | ||
1723 | page_index = pos >> PAGE_CACHE_SHIFT; | |
1724 | page = grab_cache_page(inode->i_mapping, page_index); | |
1725 | if (!PageUptodate(page)) { | |
1726 | ret = mpage_readpage(page, btrfs_get_block); | |
1727 | BUG_ON(ret); | |
1728 | lock_page(page); | |
1729 | } | |
1730 | ret = btrfs_copy_from_user(pos, 1, | |
1731 | write_bytes, &page, buf); | |
1732 | BUG_ON(ret); | |
1733 | write_bytes = inline_one_page(root, inode, page, pos, | |
1734 | offset, write_bytes); | |
1735 | SetPageUptodate(page); | |
1736 | if (write_bytes > 0 && pos + write_bytes > inode->i_size) { | |
1737 | i_size_write(inode, pos + write_bytes); | |
1738 | mark_inode_dirty(inode); | |
1739 | } | |
1740 | page_cache_release(page); | |
1741 | unlock_page(page); | |
1742 | if (write_bytes < 0) | |
1743 | goto out_unlock; | |
1744 | buf += write_bytes; | |
1745 | count -= write_bytes; | |
1746 | pos += write_bytes; | |
1747 | num_written += write_bytes; | |
1748 | ||
1749 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
1750 | cond_resched(); | |
1751 | } | |
1752 | out_unlock: | |
1753 | mutex_unlock(&inode->i_mutex); | |
1754 | out: | |
1755 | *ppos = pos; | |
1756 | current->backing_dev_info = NULL; | |
1757 | return num_written ? num_written : err; | |
1758 | } | |
e8f05c45 | 1759 | #endif |
df24a2b9 | 1760 | |
f254e52c CM |
1761 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1762 | unsigned long offset, unsigned long size) | |
1763 | { | |
1764 | char *kaddr; | |
1765 | unsigned long left, count = desc->count; | |
d6e4a428 | 1766 | struct inode *inode = page->mapping->host; |
f254e52c CM |
1767 | |
1768 | if (size > count) | |
1769 | size = count; | |
1770 | ||
1771 | if (!PageChecked(page)) { | |
1772 | /* FIXME, do it per block */ | |
d6e4a428 | 1773 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f254e52c CM |
1774 | int ret = btrfs_csum_verify_file_block(root, |
1775 | page->mapping->host->i_ino, | |
1776 | page->index << PAGE_CACHE_SHIFT, | |
1777 | kmap(page), PAGE_CACHE_SIZE); | |
1778 | if (ret) { | |
1779 | printk("failed to verify ino %lu page %lu\n", | |
1780 | page->mapping->host->i_ino, | |
1781 | page->index); | |
1782 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
1783 | } | |
1784 | SetPageChecked(page); | |
1785 | kunmap(page); | |
1786 | } | |
1787 | /* | |
1788 | * Faults on the destination of a read are common, so do it before | |
1789 | * taking the kmap. | |
1790 | */ | |
1791 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
1792 | kaddr = kmap_atomic(page, KM_USER0); | |
1793 | left = __copy_to_user_inatomic(desc->arg.buf, | |
1794 | kaddr + offset, size); | |
1795 | kunmap_atomic(kaddr, KM_USER0); | |
1796 | if (left == 0) | |
1797 | goto success; | |
1798 | } | |
1799 | ||
1800 | /* Do it the slow way */ | |
1801 | kaddr = kmap(page); | |
1802 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
1803 | kunmap(page); | |
1804 | ||
1805 | if (left) { | |
1806 | size -= left; | |
1807 | desc->error = -EFAULT; | |
1808 | } | |
1809 | success: | |
1810 | desc->count = count - size; | |
1811 | desc->written += size; | |
1812 | desc->arg.buf += size; | |
1813 | return size; | |
1814 | } | |
1815 | ||
1816 | /** | |
1817 | * btrfs_file_aio_read - filesystem read routine | |
1818 | * @iocb: kernel I/O control block | |
1819 | * @iov: io vector request | |
1820 | * @nr_segs: number of segments in the iovec | |
1821 | * @pos: current file position | |
1822 | */ | |
1823 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
1824 | unsigned long nr_segs, loff_t pos) | |
1825 | { | |
1826 | struct file *filp = iocb->ki_filp; | |
1827 | ssize_t retval; | |
1828 | unsigned long seg; | |
1829 | size_t count; | |
1830 | loff_t *ppos = &iocb->ki_pos; | |
1831 | ||
1832 | count = 0; | |
1833 | for (seg = 0; seg < nr_segs; seg++) { | |
1834 | const struct iovec *iv = &iov[seg]; | |
1835 | ||
1836 | /* | |
1837 | * If any segment has a negative length, or the cumulative | |
1838 | * length ever wraps negative then return -EINVAL. | |
1839 | */ | |
1840 | count += iv->iov_len; | |
1841 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
1842 | return -EINVAL; | |
1843 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
1844 | continue; | |
1845 | if (seg == 0) | |
1846 | return -EFAULT; | |
1847 | nr_segs = seg; | |
1848 | count -= iv->iov_len; /* This segment is no good */ | |
1849 | break; | |
1850 | } | |
1851 | retval = 0; | |
1852 | if (count) { | |
1853 | for (seg = 0; seg < nr_segs; seg++) { | |
1854 | read_descriptor_t desc; | |
1855 | ||
1856 | desc.written = 0; | |
1857 | desc.arg.buf = iov[seg].iov_base; | |
1858 | desc.count = iov[seg].iov_len; | |
1859 | if (desc.count == 0) | |
1860 | continue; | |
1861 | desc.error = 0; | |
1862 | do_generic_file_read(filp, ppos, &desc, | |
1863 | btrfs_read_actor); | |
1864 | retval += desc.written; | |
1865 | if (desc.error) { | |
1866 | retval = retval ?: desc.error; | |
1867 | break; | |
1868 | } | |
1869 | } | |
1870 | } | |
1871 | return retval; | |
1872 | } | |
1873 | ||
2619ba1f CM |
1874 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
1875 | { | |
1876 | struct btrfs_trans_handle *trans; | |
1877 | struct btrfs_key key; | |
1878 | struct btrfs_root_item root_item; | |
1879 | struct btrfs_inode_item *inode_item; | |
1880 | struct buffer_head *subvol; | |
1881 | struct btrfs_leaf *leaf; | |
1882 | struct btrfs_root *new_root; | |
1883 | struct inode *inode; | |
1884 | int ret; | |
1885 | u64 objectid; | |
1886 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
1887 | ||
1888 | mutex_lock(&root->fs_info->fs_mutex); | |
1889 | trans = btrfs_start_transaction(root, 1); | |
1890 | BUG_ON(!trans); | |
1891 | ||
1892 | subvol = btrfs_alloc_free_block(trans, root); | |
1893 | leaf = btrfs_buffer_leaf(subvol); | |
1894 | btrfs_set_header_nritems(&leaf->header, 0); | |
1895 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 1896 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f CM |
1897 | btrfs_set_header_generation(&leaf->header, trans->transid); |
1898 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, | |
1899 | sizeof(leaf->header.fsid)); | |
1900 | ||
1901 | inode_item = &root_item.inode; | |
1902 | memset(inode_item, 0, sizeof(*inode_item)); | |
1903 | btrfs_set_inode_generation(inode_item, 1); | |
1904 | btrfs_set_inode_size(inode_item, 3); | |
1905 | btrfs_set_inode_nlink(inode_item, 1); | |
1906 | btrfs_set_inode_nblocks(inode_item, 1); | |
1907 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
1908 | ||
7eccb903 | 1909 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f CM |
1910 | btrfs_set_root_refs(&root_item, 1); |
1911 | ||
1912 | mark_buffer_dirty(subvol); | |
1913 | brelse(subvol); | |
1914 | subvol = NULL; | |
1915 | ||
1916 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1917 | 0, &objectid); | |
1918 | BUG_ON(ret); | |
1919 | ||
1920 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1921 | ||
1922 | key.objectid = objectid; | |
1923 | key.offset = 1; | |
1924 | key.flags = 0; | |
1925 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
1926 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1927 | &root_item); | |
1928 | BUG_ON(ret); | |
1929 | ||
1930 | /* | |
1931 | * insert the directory item | |
1932 | */ | |
1933 | key.offset = (u64)-1; | |
1934 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1935 | name, namelen, | |
1936 | root->fs_info->sb->s_root->d_inode->i_ino, | |
1937 | &key, 0); | |
1938 | BUG_ON(ret); | |
1939 | ||
1940 | ret = btrfs_commit_transaction(trans, root); | |
1941 | BUG_ON(ret); | |
1942 | ||
1943 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
1944 | BUG_ON(!new_root); | |
1945 | ||
1946 | trans = btrfs_start_transaction(new_root, 1); | |
1947 | BUG_ON(!trans); | |
1948 | ||
1949 | inode = btrfs_new_inode(trans, new_root, new_dirid, S_IFDIR | 0700); | |
1950 | inode->i_op = &btrfs_dir_inode_operations; | |
1951 | inode->i_fop = &btrfs_dir_file_operations; | |
1952 | ||
1953 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
1954 | BUG_ON(ret); | |
1955 | ||
1956 | inode->i_nlink = 1; | |
1957 | inode->i_size = 6; | |
1958 | ret = btrfs_update_inode(trans, new_root, inode); | |
1959 | BUG_ON(ret); | |
1960 | ||
1961 | ret = btrfs_commit_transaction(trans, new_root); | |
1962 | BUG_ON(ret); | |
1963 | ||
1964 | iput(inode); | |
1965 | ||
1966 | mutex_unlock(&root->fs_info->fs_mutex); | |
1967 | return 0; | |
1968 | } | |
1969 | ||
c5739bba CM |
1970 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
1971 | { | |
1972 | struct btrfs_trans_handle *trans; | |
1973 | struct btrfs_key key; | |
1974 | struct btrfs_root_item new_root_item; | |
1975 | int ret; | |
1976 | u64 objectid; | |
1977 | ||
2619ba1f CM |
1978 | if (!root->ref_cows) |
1979 | return -EINVAL; | |
1980 | ||
c5739bba CM |
1981 | mutex_lock(&root->fs_info->fs_mutex); |
1982 | trans = btrfs_start_transaction(root, 1); | |
1983 | BUG_ON(!trans); | |
1984 | ||
1985 | ret = btrfs_update_inode(trans, root, root->inode); | |
1986 | BUG_ON(ret); | |
1987 | ||
1b05da2e CM |
1988 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
1989 | 0, &objectid); | |
c5739bba CM |
1990 | BUG_ON(ret); |
1991 | ||
c5739bba CM |
1992 | memcpy(&new_root_item, &root->root_item, |
1993 | sizeof(new_root_item)); | |
1994 | ||
c5739bba CM |
1995 | key.objectid = objectid; |
1996 | key.offset = 1; | |
1997 | key.flags = 0; | |
1998 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 1999 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2000 | |
2001 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2002 | &new_root_item); | |
2003 | BUG_ON(ret); | |
2004 | ||
c5739bba CM |
2005 | /* |
2006 | * insert the directory item | |
2007 | */ | |
2008 | key.offset = (u64)-1; | |
2009 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2010 | name, namelen, | |
2011 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2012 | &key, 0); | |
2013 | ||
2014 | BUG_ON(ret); | |
2015 | ||
2016 | ret = btrfs_inc_root_ref(trans, root); | |
2017 | BUG_ON(ret); | |
2018 | ||
2019 | ret = btrfs_commit_transaction(trans, root); | |
2020 | BUG_ON(ret); | |
2021 | mutex_unlock(&root->fs_info->fs_mutex); | |
2022 | return 0; | |
2023 | } | |
2024 | ||
8352d8a4 CM |
2025 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2026 | { | |
2027 | struct block_device *bdev; | |
2028 | struct btrfs_path *path; | |
2029 | struct super_block *sb = root->fs_info->sb; | |
2030 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2031 | struct btrfs_trans_handle *trans; | |
2032 | struct btrfs_device_item *dev_item; | |
2033 | struct btrfs_key key; | |
2034 | u16 item_size; | |
2035 | u64 num_blocks; | |
2036 | u64 new_blocks; | |
b4100d64 | 2037 | u64 device_id; |
8352d8a4 | 2038 | int ret; |
b4100d64 | 2039 | |
8352d8a4 CM |
2040 | printk("adding disk %s\n", name); |
2041 | path = btrfs_alloc_path(); | |
2042 | if (!path) | |
2043 | return -ENOMEM; | |
2044 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2045 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2046 | if (IS_ERR(bdev)) { | |
2047 | ret = PTR_ERR(bdev); | |
2048 | printk("open bdev excl failed ret %d\n", ret); | |
2049 | goto out_nolock; | |
2050 | } | |
2051 | set_blocksize(bdev, sb->s_blocksize); | |
2052 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2053 | key.objectid = num_blocks; | |
2054 | key.offset = new_blocks; | |
2055 | key.flags = 0; | |
2056 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2057 | ||
2058 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2059 | trans = btrfs_start_transaction(dev_root, 1); | |
2060 | item_size = sizeof(*dev_item) + namelen; | |
2061 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2062 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2063 | if (ret) { | |
2064 | printk("insert failed %d\n", ret); | |
2065 | close_bdev_excl(bdev); | |
2066 | if (ret > 0) | |
2067 | ret = -EEXIST; | |
2068 | goto out; | |
2069 | } | |
2070 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2071 | path->slots[0], struct btrfs_device_item); | |
2072 | btrfs_set_device_pathlen(dev_item, namelen); | |
2073 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2074 | |
2075 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2076 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2077 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2078 | mark_buffer_dirty(path->nodes[0]); |
2079 | ||
b4100d64 CM |
2080 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2081 | new_blocks); | |
8352d8a4 CM |
2082 | |
2083 | if (!ret) { | |
2084 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2085 | num_blocks + new_blocks); | |
2086 | i_size_write(root->fs_info->btree_inode, | |
2087 | (num_blocks + new_blocks) << | |
2088 | root->fs_info->btree_inode->i_blkbits); | |
2089 | } | |
2090 | ||
2091 | out: | |
2092 | ret = btrfs_commit_transaction(trans, dev_root); | |
2093 | BUG_ON(ret); | |
2094 | mutex_unlock(&root->fs_info->fs_mutex); | |
2095 | out_nolock: | |
2096 | btrfs_free_path(path); | |
2097 | ||
2098 | return ret; | |
2099 | } | |
2100 | ||
c5739bba CM |
2101 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2102 | cmd, unsigned long arg) | |
2103 | { | |
2104 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2105 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2106 | int ret = 0; |
c5739bba | 2107 | int namelen; |
2619ba1f CM |
2108 | struct btrfs_path *path; |
2109 | u64 root_dirid; | |
c5739bba | 2110 | |
c5739bba CM |
2111 | switch (cmd) { |
2112 | case BTRFS_IOC_SNAP_CREATE: | |
2113 | if (copy_from_user(&vol_args, | |
2114 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2115 | sizeof(vol_args))) | |
2116 | return -EFAULT; | |
2117 | namelen = strlen(vol_args.name); | |
2118 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2119 | return -EINVAL; | |
2619ba1f CM |
2120 | path = btrfs_alloc_path(); |
2121 | if (!path) | |
2122 | return -ENOMEM; | |
2d13d8d0 | 2123 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f CM |
2124 | mutex_lock(&root->fs_info->fs_mutex); |
2125 | ret = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2126 | path, root_dirid, | |
2127 | vol_args.name, namelen, 0); | |
2128 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2129 | btrfs_free_path(path); |
2619ba1f CM |
2130 | if (ret == 0) |
2131 | return -EEXIST; | |
2132 | ||
2133 | if (root == root->fs_info->tree_root) | |
2134 | ret = create_subvol(root, vol_args.name, namelen); | |
2135 | else | |
2136 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2137 | WARN_ON(ret); |
2138 | break; | |
8352d8a4 CM |
2139 | case BTRFS_IOC_ADD_DISK: |
2140 | if (copy_from_user(&vol_args, | |
2141 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2142 | sizeof(vol_args))) | |
2143 | return -EFAULT; | |
2144 | namelen = strlen(vol_args.name); | |
2145 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2146 | return -EINVAL; | |
2147 | vol_args.name[namelen] = '\0'; | |
2148 | ret = add_disk(root, vol_args.name, namelen); | |
2149 | break; | |
c5739bba CM |
2150 | default: |
2151 | return -ENOTTY; | |
2152 | } | |
8352d8a4 | 2153 | return ret; |
c5739bba CM |
2154 | } |
2155 | ||
2c90e5d6 CM |
2156 | static struct kmem_cache *btrfs_inode_cachep; |
2157 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2158 | struct kmem_cache *btrfs_transaction_cachep; | |
2159 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2160 | struct kmem_cache *btrfs_path_cachep; | |
2161 | ||
2162 | /* | |
2163 | * Called inside transaction, so use GFP_NOFS | |
2164 | */ | |
2165 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2166 | { | |
2167 | struct btrfs_inode *ei; | |
2168 | ||
2169 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2170 | if (!ei) | |
2171 | return NULL; | |
2c90e5d6 CM |
2172 | return &ei->vfs_inode; |
2173 | } | |
2174 | ||
2175 | static void btrfs_destroy_inode(struct inode *inode) | |
2176 | { | |
2c90e5d6 | 2177 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2178 | WARN_ON(inode->i_data.nrpages); |
2179 | ||
2c90e5d6 CM |
2180 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2181 | } | |
2182 | ||
2183 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2184 | unsigned long flags) | |
2185 | { | |
2186 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2187 | ||
2188 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
2189 | SLAB_CTOR_CONSTRUCTOR) { | |
2190 | inode_init_once(&ei->vfs_inode); | |
2191 | } | |
2192 | } | |
2193 | ||
2194 | static int init_inodecache(void) | |
2195 | { | |
2196 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2197 | sizeof(struct btrfs_inode), | |
2198 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2199 | SLAB_MEM_SPREAD), | |
2200 | init_once, NULL); | |
2201 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2202 | sizeof(struct btrfs_trans_handle), | |
2203 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2204 | SLAB_MEM_SPREAD), | |
2205 | NULL, NULL); | |
2206 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2207 | sizeof(struct btrfs_transaction), | |
2208 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2209 | SLAB_MEM_SPREAD), | |
2210 | NULL, NULL); | |
2211 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2212 | sizeof(struct btrfs_transaction), | |
2213 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2214 | SLAB_MEM_SPREAD), | |
2215 | NULL, NULL); | |
2216 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2217 | 256, | |
2218 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2219 | SLAB_MEM_SPREAD | | |
2220 | SLAB_DESTROY_BY_RCU), | |
2221 | NULL, NULL); | |
2222 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2223 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2224 | return -ENOMEM; | |
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | static void destroy_inodecache(void) | |
2229 | { | |
2230 | kmem_cache_destroy(btrfs_inode_cachep); | |
2231 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2232 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2233 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2234 | kmem_cache_destroy(btrfs_path_cachep); | |
2235 | } | |
2236 | ||
2e635a27 CM |
2237 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2238 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2239 | { | |
2240 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2241 | btrfs_fill_super, mnt); | |
2242 | } | |
2243 | ||
2244 | static struct file_system_type btrfs_fs_type = { | |
2245 | .owner = THIS_MODULE, | |
2246 | .name = "btrfs", | |
2247 | .get_sb = btrfs_get_sb, | |
2248 | .kill_sb = kill_block_super, | |
2249 | .fs_flags = FS_REQUIRES_DEV, | |
2250 | }; | |
2251 | ||
e20d96d6 CM |
2252 | static struct super_operations btrfs_super_ops = { |
2253 | .statfs = simple_statfs, | |
134e9731 | 2254 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2255 | .put_super = btrfs_put_super, |
2256 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2257 | .write_super = btrfs_write_super, |
2258 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2259 | .write_inode = btrfs_write_inode, |
2c90e5d6 CM |
2260 | .alloc_inode = btrfs_alloc_inode, |
2261 | .destroy_inode = btrfs_destroy_inode, | |
e20d96d6 CM |
2262 | }; |
2263 | ||
2264 | static struct inode_operations btrfs_dir_inode_operations = { | |
2265 | .lookup = btrfs_lookup, | |
d5719762 | 2266 | .create = btrfs_create, |
134e9731 | 2267 | .unlink = btrfs_unlink, |
f7922033 | 2268 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2269 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
2270 | }; |
2271 | ||
d6e4a428 CM |
2272 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2273 | .lookup = btrfs_lookup, | |
2274 | }; | |
2275 | ||
e20d96d6 CM |
2276 | static struct file_operations btrfs_dir_file_operations = { |
2277 | .llseek = generic_file_llseek, | |
2278 | .read = generic_read_dir, | |
2279 | .readdir = btrfs_readdir, | |
c5739bba | 2280 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2281 | }; |
2282 | ||
dee26a9f CM |
2283 | static struct address_space_operations btrfs_aops = { |
2284 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2285 | .writepage = btrfs_writepage, |
2286 | .sync_page = block_sync_page, | |
2287 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2288 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2289 | }; |
2290 | ||
2291 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 2292 | .truncate = btrfs_truncate, |
dee26a9f CM |
2293 | }; |
2294 | ||
2295 | static struct file_operations btrfs_file_operations = { | |
2296 | .llseek = generic_file_llseek, | |
2297 | .read = do_sync_read, | |
e8f05c45 CM |
2298 | .aio_read = btrfs_file_aio_read, |
2299 | .write = btrfs_file_write, | |
dee26a9f CM |
2300 | .mmap = generic_file_mmap, |
2301 | .open = generic_file_open, | |
c5739bba | 2302 | .ioctl = btrfs_ioctl, |
dee26a9f | 2303 | }; |
e20d96d6 | 2304 | |
2e635a27 CM |
2305 | static int __init init_btrfs_fs(void) |
2306 | { | |
2c90e5d6 | 2307 | int err; |
2e635a27 | 2308 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2309 | err = init_inodecache(); |
2310 | if (err) | |
2311 | return err; | |
d6e4a428 CM |
2312 | kset_set_kset_s(&btrfs_subsys, fs_subsys); |
2313 | err = subsystem_register(&btrfs_subsys); | |
2314 | if (err) | |
2315 | goto out; | |
2e635a27 | 2316 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2317 | out: |
2318 | destroy_inodecache(); | |
2319 | return err; | |
2e635a27 CM |
2320 | } |
2321 | ||
2322 | static void __exit exit_btrfs_fs(void) | |
2323 | { | |
2c90e5d6 | 2324 | destroy_inodecache(); |
2e635a27 | 2325 | unregister_filesystem(&btrfs_fs_type); |
d6e4a428 | 2326 | subsystem_unregister(&btrfs_subsys); |
2e635a27 CM |
2327 | printk("btrfs unloaded\n"); |
2328 | } | |
2329 | ||
2330 | module_init(init_btrfs_fs) | |
2331 | module_exit(exit_btrfs_fs) | |
2332 | ||
2333 | MODULE_LICENSE("GPL"); |