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> | |
8fd17795 | 14 | #include <linux/statfs.h> |
2e635a27 | 15 | #include "ctree.h" |
e20d96d6 | 16 | #include "disk-io.h" |
d5719762 | 17 | #include "transaction.h" |
2c90e5d6 | 18 | #include "btrfs_inode.h" |
c5739bba | 19 | #include "ioctl.h" |
2e635a27 | 20 | |
35b7e476 | 21 | static void btrfs_fsinfo_release(struct kobject *obj) |
d6e4a428 CM |
22 | { |
23 | struct btrfs_fs_info *fsinfo = container_of(obj, | |
24 | struct btrfs_fs_info, kobj); | |
25 | kfree(fsinfo); | |
26 | } | |
27 | ||
35b7e476 | 28 | static struct kobj_type btrfs_fsinfo_ktype = { |
d6e4a428 CM |
29 | .release = btrfs_fsinfo_release, |
30 | }; | |
31 | ||
c5739bba CM |
32 | struct btrfs_iget_args { |
33 | u64 ino; | |
34 | struct btrfs_root *root; | |
35 | }; | |
36 | ||
d6e4a428 CM |
37 | decl_subsys(btrfs, &btrfs_fsinfo_ktype, NULL); |
38 | ||
2e635a27 | 39 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
40 | |
41 | static struct inode_operations btrfs_dir_inode_operations; | |
d6e4a428 | 42 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
43 | static struct super_operations btrfs_super_ops; |
44 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
45 | static struct inode_operations btrfs_file_inode_operations; |
46 | static struct address_space_operations btrfs_aops; | |
47 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 48 | |
e20d96d6 | 49 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 50 | { |
5caf2a00 | 51 | struct btrfs_path *path; |
e20d96d6 | 52 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
53 | struct btrfs_root *root = BTRFS_I(inode)->root; |
54 | struct btrfs_key location; | |
31f3c99b CM |
55 | struct btrfs_block_group_cache *alloc_group; |
56 | u64 alloc_group_block; | |
e20d96d6 | 57 | int ret; |
f4b9aa8d | 58 | |
5caf2a00 CM |
59 | path = btrfs_alloc_path(); |
60 | BUG_ON(!path); | |
61 | btrfs_init_path(path); | |
f4b9aa8d CM |
62 | mutex_lock(&root->fs_info->fs_mutex); |
63 | ||
d6e4a428 CM |
64 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
65 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 66 | if (ret) { |
7cfcc17e | 67 | btrfs_free_path(path); |
d6e4a428 | 68 | goto make_bad; |
e20d96d6 | 69 | } |
5caf2a00 CM |
70 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
71 | path->slots[0], | |
e20d96d6 | 72 | struct btrfs_inode_item); |
2e635a27 | 73 | |
e20d96d6 CM |
74 | inode->i_mode = btrfs_inode_mode(inode_item); |
75 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
76 | inode->i_uid = btrfs_inode_uid(inode_item); | |
77 | inode->i_gid = btrfs_inode_gid(inode_item); | |
78 | inode->i_size = btrfs_inode_size(inode_item); | |
79 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
80 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
81 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
82 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
83 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
84 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
85 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
86 | inode->i_generation = btrfs_inode_generation(inode_item); | |
31f3c99b CM |
87 | alloc_group_block = btrfs_inode_block_group(inode_item); |
88 | ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix, | |
89 | (void **)&alloc_group, | |
90 | alloc_group_block, 1); | |
91 | BUG_ON(!ret); | |
92 | BTRFS_I(inode)->block_group = alloc_group; | |
5caf2a00 | 93 | |
5caf2a00 CM |
94 | btrfs_free_path(path); |
95 | inode_item = NULL; | |
96 | ||
f4b9aa8d | 97 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 98 | |
e20d96d6 CM |
99 | switch (inode->i_mode & S_IFMT) { |
100 | #if 0 | |
101 | default: | |
102 | init_special_inode(inode, inode->i_mode, | |
103 | btrfs_inode_rdev(inode_item)); | |
104 | break; | |
105 | #endif | |
106 | case S_IFREG: | |
dee26a9f CM |
107 | inode->i_mapping->a_ops = &btrfs_aops; |
108 | inode->i_fop = &btrfs_file_operations; | |
109 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
110 | break; |
111 | case S_IFDIR: | |
e20d96d6 | 112 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
113 | if (root == root->fs_info->tree_root) |
114 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
115 | else | |
116 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
117 | break; |
118 | case S_IFLNK: | |
e20d96d6 CM |
119 | // inode->i_op = &page_symlink_inode_operations; |
120 | break; | |
2e635a27 | 121 | } |
e20d96d6 | 122 | return; |
d6e4a428 CM |
123 | |
124 | make_bad: | |
125 | btrfs_release_path(root, path); | |
126 | btrfs_free_path(path); | |
127 | mutex_unlock(&root->fs_info->fs_mutex); | |
128 | make_bad_inode(inode); | |
2e635a27 CM |
129 | } |
130 | ||
f68cad0f CM |
131 | static void fill_inode_item(struct btrfs_inode_item *item, |
132 | struct inode *inode) | |
133 | { | |
134 | btrfs_set_inode_uid(item, inode->i_uid); | |
135 | btrfs_set_inode_gid(item, inode->i_gid); | |
136 | btrfs_set_inode_size(item, inode->i_size); | |
137 | btrfs_set_inode_mode(item, inode->i_mode); | |
138 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
139 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
140 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
141 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
142 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
143 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
144 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
145 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
146 | btrfs_set_inode_generation(item, inode->i_generation); | |
31f3c99b CM |
147 | btrfs_set_inode_block_group(item, |
148 | BTRFS_I(inode)->block_group->key.objectid); | |
f68cad0f CM |
149 | } |
150 | ||
f68cad0f CM |
151 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
152 | struct btrfs_root *root, | |
153 | struct inode *inode) | |
154 | { | |
155 | struct btrfs_inode_item *inode_item; | |
156 | struct btrfs_path *path; | |
157 | int ret; | |
158 | ||
159 | path = btrfs_alloc_path(); | |
160 | BUG_ON(!path); | |
161 | btrfs_init_path(path); | |
162 | ret = btrfs_lookup_inode(trans, root, path, | |
163 | &BTRFS_I(inode)->location, 1); | |
164 | if (ret) { | |
165 | if (ret > 0) | |
166 | ret = -ENOENT; | |
167 | goto failed; | |
168 | } | |
169 | ||
170 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
171 | path->slots[0], | |
172 | struct btrfs_inode_item); | |
173 | ||
174 | fill_inode_item(inode_item, inode); | |
175 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
176 | ret = 0; | |
177 | failed: | |
178 | btrfs_release_path(root, path); | |
179 | btrfs_free_path(path); | |
180 | return ret; | |
181 | } | |
182 | ||
183 | ||
5f443fd2 CM |
184 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
185 | struct btrfs_root *root, | |
186 | struct inode *dir, | |
187 | struct dentry *dentry) | |
134e9731 | 188 | { |
5caf2a00 | 189 | struct btrfs_path *path; |
134e9731 CM |
190 | const char *name = dentry->d_name.name; |
191 | int name_len = dentry->d_name.len; | |
7e38180e | 192 | int ret = 0; |
134e9731 CM |
193 | u64 objectid; |
194 | struct btrfs_dir_item *di; | |
195 | ||
5caf2a00 CM |
196 | path = btrfs_alloc_path(); |
197 | BUG_ON(!path); | |
198 | btrfs_init_path(path); | |
7e38180e | 199 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 200 | name, name_len, -1); |
7e38180e CM |
201 | if (IS_ERR(di)) { |
202 | ret = PTR_ERR(di); | |
134e9731 | 203 | goto err; |
7e38180e CM |
204 | } |
205 | if (!di) { | |
134e9731 CM |
206 | ret = -ENOENT; |
207 | goto err; | |
208 | } | |
d6e4a428 | 209 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
210 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
211 | BUG_ON(ret); | |
212 | btrfs_release_path(root, path); | |
134e9731 | 213 | |
7e38180e CM |
214 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
215 | objectid, name, name_len, -1); | |
216 | if (IS_ERR(di)) { | |
217 | ret = PTR_ERR(di); | |
218 | goto err; | |
219 | } | |
220 | if (!di) { | |
221 | ret = -ENOENT; | |
222 | goto err; | |
223 | } | |
224 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
225 | BUG_ON(ret); |
226 | ||
134e9731 CM |
227 | dentry->d_inode->i_ctime = dir->i_ctime; |
228 | err: | |
5caf2a00 | 229 | btrfs_free_path(path); |
f68cad0f | 230 | if (!ret) { |
5f26f772 | 231 | dir->i_size -= name_len * 2; |
f68cad0f CM |
232 | btrfs_update_inode(trans, root, dir); |
233 | drop_nlink(dentry->d_inode); | |
234 | btrfs_update_inode(trans, root, dentry->d_inode); | |
cd1bc465 | 235 | dir->i_sb->s_dirt = 1; |
d4dbff95 | 236 | } |
134e9731 CM |
237 | return ret; |
238 | } | |
239 | ||
5f443fd2 CM |
240 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
241 | { | |
242 | struct btrfs_root *root; | |
243 | struct btrfs_trans_handle *trans; | |
244 | int ret; | |
245 | ||
d6e4a428 | 246 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
247 | mutex_lock(&root->fs_info->fs_mutex); |
248 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 249 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
250 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
251 | btrfs_end_transaction(trans, root); | |
252 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 253 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
254 | return ret; |
255 | } | |
256 | ||
257 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
258 | { | |
259 | struct inode *inode = dentry->d_inode; | |
260 | int err; | |
261 | int ret; | |
d6e4a428 | 262 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 263 | struct btrfs_path *path; |
5f443fd2 CM |
264 | struct btrfs_key key; |
265 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
266 | struct btrfs_key found_key; |
267 | int found_type; | |
5f443fd2 | 268 | struct btrfs_leaf *leaf; |
5f26f772 | 269 | char *goodnames = ".."; |
5f443fd2 | 270 | |
5caf2a00 CM |
271 | path = btrfs_alloc_path(); |
272 | BUG_ON(!path); | |
273 | btrfs_init_path(path); | |
5f443fd2 CM |
274 | mutex_lock(&root->fs_info->fs_mutex); |
275 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 276 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
277 | key.objectid = inode->i_ino; |
278 | key.offset = (u64)-1; | |
5f26f772 CM |
279 | key.flags = (u32)-1; |
280 | while(1) { | |
281 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
282 | if (ret < 0) { | |
283 | err = ret; | |
284 | goto out; | |
285 | } | |
286 | BUG_ON(ret == 0); | |
287 | if (path->slots[0] == 0) { | |
288 | err = -ENOENT; | |
289 | goto out; | |
290 | } | |
291 | path->slots[0]--; | |
292 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
293 | btrfs_disk_key_to_cpu(&found_key, | |
294 | &leaf->items[path->slots[0]].key); | |
295 | found_type = btrfs_key_type(&found_key); | |
296 | if (found_key.objectid != inode->i_ino) { | |
297 | err = -ENOENT; | |
298 | goto out; | |
299 | } | |
300 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
301 | found_type != BTRFS_DIR_INDEX_KEY) || | |
302 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
303 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
304 | err = -ENOTEMPTY; | |
305 | goto out; | |
306 | } | |
307 | ret = btrfs_del_item(trans, root, path); | |
308 | BUG_ON(ret); | |
5f443fd2 | 309 | |
5f26f772 CM |
310 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
311 | break; | |
312 | btrfs_release_path(root, path); | |
5f443fd2 | 313 | } |
5f26f772 | 314 | ret = 0; |
5caf2a00 | 315 | btrfs_release_path(root, path); |
5f443fd2 CM |
316 | |
317 | /* now the directory is empty */ | |
318 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
319 | if (!err) { | |
320 | inode->i_size = 0; | |
321 | } | |
322 | out: | |
7cfcc17e CM |
323 | btrfs_release_path(root, path); |
324 | btrfs_free_path(path); | |
5f443fd2 CM |
325 | mutex_unlock(&root->fs_info->fs_mutex); |
326 | ret = btrfs_end_transaction(trans, root); | |
35b7e476 | 327 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
328 | if (ret && !err) |
329 | err = ret; | |
330 | return err; | |
331 | } | |
332 | ||
134e9731 CM |
333 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
334 | struct btrfs_root *root, | |
335 | struct inode *inode) | |
336 | { | |
5caf2a00 | 337 | struct btrfs_path *path; |
134e9731 | 338 | int ret; |
5caf2a00 | 339 | |
134e9731 | 340 | clear_inode(inode); |
5caf2a00 CM |
341 | |
342 | path = btrfs_alloc_path(); | |
343 | BUG_ON(!path); | |
344 | btrfs_init_path(path); | |
d6e4a428 CM |
345 | ret = btrfs_lookup_inode(trans, root, path, |
346 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 347 | BUG_ON(ret); |
5caf2a00 | 348 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 349 | BUG_ON(ret); |
5caf2a00 | 350 | btrfs_free_path(path); |
134e9731 CM |
351 | return ret; |
352 | } | |
353 | ||
de428b63 CM |
354 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
355 | u64 objectid) | |
356 | { | |
357 | struct btrfs_node *node; | |
358 | int i; | |
359 | int nritems; | |
360 | u64 item_objectid; | |
361 | u64 blocknr; | |
362 | int slot; | |
363 | int ret; | |
364 | ||
365 | if (!path->nodes[1]) | |
366 | return; | |
367 | node = btrfs_buffer_node(path->nodes[1]); | |
368 | slot = path->slots[1]; | |
369 | if (slot == 0) | |
370 | return; | |
371 | nritems = btrfs_header_nritems(&node->header); | |
372 | for (i = slot - 1; i >= 0; i--) { | |
373 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
374 | if (item_objectid != objectid) | |
375 | break; | |
376 | blocknr = btrfs_node_blockptr(node, i); | |
377 | ret = readahead_tree_block(root, blocknr); | |
378 | if (ret) | |
379 | break; | |
380 | } | |
381 | } | |
382 | ||
f4b9aa8d CM |
383 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
384 | struct btrfs_root *root, | |
385 | struct inode *inode) | |
386 | { | |
387 | int ret; | |
5caf2a00 | 388 | struct btrfs_path *path; |
f4b9aa8d CM |
389 | struct btrfs_key key; |
390 | struct btrfs_disk_key *found_key; | |
391 | struct btrfs_leaf *leaf; | |
f254e52c CM |
392 | struct btrfs_file_extent_item *fi = NULL; |
393 | u64 extent_start = 0; | |
394 | u64 extent_num_blocks = 0; | |
395 | int found_extent; | |
f4b9aa8d | 396 | |
5caf2a00 CM |
397 | path = btrfs_alloc_path(); |
398 | BUG_ON(!path); | |
f4b9aa8d CM |
399 | /* FIXME, add redo link to tree so we don't leak on crash */ |
400 | key.objectid = inode->i_ino; | |
401 | key.offset = (u64)-1; | |
402 | key.flags = 0; | |
d4dbff95 CM |
403 | /* |
404 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
405 | * or extent data | |
406 | */ | |
f254e52c | 407 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 408 | while(1) { |
5caf2a00 CM |
409 | btrfs_init_path(path); |
410 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 411 | if (ret < 0) { |
f4b9aa8d CM |
412 | goto error; |
413 | } | |
414 | if (ret > 0) { | |
5caf2a00 CM |
415 | BUG_ON(path->slots[0] == 0); |
416 | path->slots[0]--; | |
f4b9aa8d | 417 | } |
de428b63 | 418 | reada_truncate(root, path, inode->i_ino); |
5caf2a00 CM |
419 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
420 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
421 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
422 | break; | |
f254e52c CM |
423 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
424 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 425 | break; |
f4b9aa8d CM |
426 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
427 | break; | |
236454df | 428 | found_extent = 0; |
f254e52c | 429 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
430 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
431 | path->slots[0], | |
f254e52c | 432 | struct btrfs_file_extent_item); |
236454df CM |
433 | if (btrfs_file_extent_type(fi) != |
434 | BTRFS_FILE_EXTENT_INLINE) { | |
435 | extent_start = | |
436 | btrfs_file_extent_disk_blocknr(fi); | |
437 | extent_num_blocks = | |
438 | btrfs_file_extent_disk_num_blocks(fi); | |
439 | /* FIXME blocksize != 4096 */ | |
440 | inode->i_blocks -= | |
441 | btrfs_file_extent_num_blocks(fi) << 3; | |
442 | found_extent = 1; | |
443 | } | |
f254e52c | 444 | } |
5caf2a00 | 445 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 446 | BUG_ON(ret); |
5caf2a00 | 447 | btrfs_release_path(root, path); |
f254e52c CM |
448 | if (found_extent) { |
449 | ret = btrfs_free_extent(trans, root, extent_start, | |
450 | extent_num_blocks, 0); | |
451 | BUG_ON(ret); | |
452 | } | |
f4b9aa8d | 453 | } |
f4b9aa8d CM |
454 | ret = 0; |
455 | error: | |
5caf2a00 CM |
456 | btrfs_release_path(root, path); |
457 | btrfs_free_path(path); | |
cd1bc465 | 458 | inode->i_sb->s_dirt = 1; |
f4b9aa8d CM |
459 | return ret; |
460 | } | |
461 | ||
134e9731 CM |
462 | static void btrfs_delete_inode(struct inode *inode) |
463 | { | |
464 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 465 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
466 | int ret; |
467 | ||
134e9731 CM |
468 | truncate_inode_pages(&inode->i_data, 0); |
469 | if (is_bad_inode(inode)) { | |
470 | goto no_delete; | |
471 | } | |
472 | inode->i_size = 0; | |
134e9731 CM |
473 | mutex_lock(&root->fs_info->fs_mutex); |
474 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 475 | btrfs_set_trans_block_group(trans, inode); |
f4b9aa8d CM |
476 | if (S_ISREG(inode->i_mode)) { |
477 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
478 | BUG_ON(ret); | |
479 | } | |
134e9731 CM |
480 | btrfs_free_inode(trans, root, inode); |
481 | btrfs_end_transaction(trans, root); | |
482 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 483 | btrfs_btree_balance_dirty(root); |
134e9731 CM |
484 | return; |
485 | no_delete: | |
486 | clear_inode(inode); | |
487 | } | |
488 | ||
e20d96d6 | 489 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 490 | struct btrfs_key *location) |
e20d96d6 CM |
491 | { |
492 | const char *name = dentry->d_name.name; | |
493 | int namelen = dentry->d_name.len; | |
494 | struct btrfs_dir_item *di; | |
5caf2a00 | 495 | struct btrfs_path *path; |
d6e4a428 | 496 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
497 | int ret; |
498 | ||
5caf2a00 CM |
499 | path = btrfs_alloc_path(); |
500 | BUG_ON(!path); | |
501 | btrfs_init_path(path); | |
7e38180e | 502 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 503 | namelen, 0); |
7e38180e | 504 | if (!di || IS_ERR(di)) { |
d6e4a428 | 505 | location->objectid = 0; |
2c90e5d6 | 506 | ret = 0; |
e20d96d6 CM |
507 | goto out; |
508 | } | |
d6e4a428 | 509 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 510 | out: |
5caf2a00 CM |
511 | btrfs_release_path(root, path); |
512 | btrfs_free_path(path); | |
e20d96d6 CM |
513 | return ret; |
514 | } | |
515 | ||
35b7e476 | 516 | static int fixup_tree_root_location(struct btrfs_root *root, |
d6e4a428 CM |
517 | struct btrfs_key *location, |
518 | struct btrfs_root **sub_root) | |
519 | { | |
520 | struct btrfs_path *path; | |
521 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
522 | |
523 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
524 | return 0; | |
525 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
526 | return 0; | |
527 | ||
528 | path = btrfs_alloc_path(); | |
529 | BUG_ON(!path); | |
530 | mutex_lock(&root->fs_info->fs_mutex); | |
531 | ||
0f7d52f4 CM |
532 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
533 | if (IS_ERR(*sub_root)) | |
534 | return PTR_ERR(*sub_root); | |
535 | ||
536 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
537 | location->objectid = btrfs_root_dirid(ri); |
538 | location->flags = 0; | |
539 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
540 | location->offset = 0; | |
0f7d52f4 | 541 | |
d6e4a428 CM |
542 | btrfs_free_path(path); |
543 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 544 | return 0; |
d6e4a428 CM |
545 | } |
546 | ||
35b7e476 | 547 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
c5739bba CM |
548 | { |
549 | struct btrfs_iget_args *args = p; | |
550 | inode->i_ino = args->ino; | |
551 | BTRFS_I(inode)->root = args->root; | |
552 | return 0; | |
553 | } | |
554 | ||
35b7e476 | 555 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
c5739bba CM |
556 | { |
557 | struct btrfs_iget_args *args = opaque; | |
558 | return (args->ino == inode->i_ino && | |
559 | args->root == BTRFS_I(inode)->root); | |
560 | } | |
561 | ||
35b7e476 CM |
562 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
563 | struct btrfs_root *root) | |
c5739bba CM |
564 | { |
565 | struct inode *inode; | |
566 | struct btrfs_iget_args args; | |
567 | args.ino = objectid; | |
568 | args.root = root; | |
569 | ||
570 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
571 | btrfs_init_locked_inode, | |
572 | (void *)&args); | |
573 | return inode; | |
574 | } | |
d6e4a428 | 575 | |
e20d96d6 CM |
576 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
577 | struct nameidata *nd) | |
578 | { | |
579 | struct inode * inode; | |
d6e4a428 CM |
580 | struct btrfs_inode *bi = BTRFS_I(dir); |
581 | struct btrfs_root *root = bi->root; | |
582 | struct btrfs_root *sub_root = root; | |
583 | struct btrfs_key location; | |
e20d96d6 CM |
584 | int ret; |
585 | ||
586 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
587 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 588 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 589 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 590 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
591 | if (ret < 0) |
592 | return ERR_PTR(ret); | |
593 | inode = NULL; | |
d6e4a428 CM |
594 | if (location.objectid) { |
595 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
596 | if (ret < 0) | |
597 | return ERR_PTR(ret); | |
598 | if (ret > 0) | |
599 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
600 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
601 | sub_root); | |
e20d96d6 CM |
602 | if (!inode) |
603 | return ERR_PTR(-EACCES); | |
d6e4a428 | 604 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 605 | if (sub_root != root) { |
c5739bba | 606 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
607 | igrab(inode); |
608 | sub_root->inode = inode; | |
609 | } | |
d6e4a428 CM |
610 | BTRFS_I(inode)->root = sub_root; |
611 | memcpy(&BTRFS_I(inode)->location, &location, | |
612 | sizeof(location)); | |
613 | btrfs_read_locked_inode(inode); | |
614 | unlock_new_inode(inode); | |
615 | } | |
e20d96d6 CM |
616 | } |
617 | return d_splice_alias(inode, dentry); | |
618 | } | |
619 | ||
de428b63 CM |
620 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
621 | u64 objectid) | |
090d1875 CM |
622 | { |
623 | struct btrfs_node *node; | |
624 | int i; | |
de428b63 | 625 | u32 nritems; |
090d1875 CM |
626 | u64 item_objectid; |
627 | u64 blocknr; | |
628 | int slot; | |
de428b63 | 629 | int ret; |
090d1875 CM |
630 | |
631 | if (!path->nodes[1]) | |
632 | return; | |
633 | node = btrfs_buffer_node(path->nodes[1]); | |
634 | slot = path->slots[1]; | |
090d1875 | 635 | nritems = btrfs_header_nritems(&node->header); |
de428b63 | 636 | for (i = slot + 1; i < nritems; i++) { |
090d1875 CM |
637 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
638 | if (item_objectid != objectid) | |
639 | break; | |
640 | blocknr = btrfs_node_blockptr(node, i); | |
de428b63 CM |
641 | ret = readahead_tree_block(root, blocknr); |
642 | if (ret) | |
643 | break; | |
090d1875 CM |
644 | } |
645 | } | |
646 | ||
e20d96d6 CM |
647 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
648 | { | |
649 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 650 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
651 | struct btrfs_item *item; |
652 | struct btrfs_dir_item *di; | |
653 | struct btrfs_key key; | |
5caf2a00 | 654 | struct btrfs_path *path; |
e20d96d6 CM |
655 | int ret; |
656 | u32 nritems; | |
657 | struct btrfs_leaf *leaf; | |
658 | int slot; | |
659 | int advance; | |
660 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 661 | int over = 0; |
7e38180e CM |
662 | u32 di_cur; |
663 | u32 di_total; | |
664 | u32 di_len; | |
665 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
666 | |
667 | /* FIXME, use a real flag for deciding about the key type */ | |
668 | if (root->fs_info->tree_root == root) | |
669 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 670 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 671 | key.objectid = inode->i_ino; |
e20d96d6 | 672 | key.flags = 0; |
d6e4a428 | 673 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 674 | key.offset = filp->f_pos; |
5caf2a00 CM |
675 | path = btrfs_alloc_path(); |
676 | btrfs_init_path(path); | |
677 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 678 | if (ret < 0) |
e20d96d6 | 679 | goto err; |
7f5c1516 | 680 | advance = 0; |
de428b63 | 681 | reada_leaves(root, path, inode->i_ino); |
e20d96d6 | 682 | while(1) { |
5caf2a00 | 683 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 684 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 685 | slot = path->slots[0]; |
dee26a9f CM |
686 | if (advance || slot >= nritems) { |
687 | if (slot >= nritems -1) { | |
de428b63 | 688 | reada_leaves(root, path, inode->i_ino); |
5caf2a00 | 689 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
690 | if (ret) |
691 | break; | |
5caf2a00 | 692 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 693 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 694 | slot = path->slots[0]; |
e20d96d6 CM |
695 | } else { |
696 | slot++; | |
5caf2a00 | 697 | path->slots[0]++; |
e20d96d6 CM |
698 | } |
699 | } | |
700 | advance = 1; | |
701 | item = leaf->items + slot; | |
e20d96d6 CM |
702 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
703 | break; | |
d6e4a428 | 704 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 705 | break; |
7f5c1516 CM |
706 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
707 | continue; | |
7fcde0e3 | 708 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 709 | advance = 1; |
e20d96d6 | 710 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
711 | di_cur = 0; |
712 | di_total = btrfs_item_size(leaf->items + slot); | |
713 | while(di_cur < di_total) { | |
714 | over = filldir(dirent, (const char *)(di + 1), | |
715 | btrfs_dir_name_len(di), | |
716 | btrfs_disk_key_offset(&item->key), | |
717 | btrfs_disk_key_objectid(&di->location), | |
718 | d_type); | |
719 | if (over) | |
720 | goto nopos; | |
721 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
722 | di_cur += di_len; | |
723 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
724 | } | |
e20d96d6 | 725 | } |
7fcde0e3 CM |
726 | filp->f_pos++; |
727 | nopos: | |
e20d96d6 CM |
728 | ret = 0; |
729 | err: | |
5caf2a00 CM |
730 | btrfs_release_path(root, path); |
731 | btrfs_free_path(path); | |
22b0ebda | 732 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
733 | return ret; |
734 | } | |
735 | ||
736 | static void btrfs_put_super (struct super_block * sb) | |
737 | { | |
738 | struct btrfs_root *root = btrfs_sb(sb); | |
739 | int ret; | |
740 | ||
741 | ret = close_ctree(root); | |
742 | if (ret) { | |
743 | printk("close ctree returns %d\n", ret); | |
744 | } | |
745 | sb->s_fs_info = NULL; | |
746 | } | |
2e635a27 CM |
747 | |
748 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
749 | { | |
750 | struct inode * inode; | |
e20d96d6 CM |
751 | struct dentry * root_dentry; |
752 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 753 | struct btrfs_root *tree_root; |
d6e4a428 | 754 | struct btrfs_inode *bi; |
2e635a27 CM |
755 | |
756 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 757 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 758 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 759 | sb->s_time_gran = 1; |
e20d96d6 | 760 | |
0f7d52f4 | 761 | tree_root = open_ctree(sb); |
d98237b3 | 762 | |
0f7d52f4 | 763 | if (!tree_root) { |
e20d96d6 CM |
764 | printk("btrfs: open_ctree failed\n"); |
765 | return -EIO; | |
766 | } | |
0f7d52f4 CM |
767 | sb->s_fs_info = tree_root; |
768 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
769 | printk("read in super total blocks %Lu root %Lu\n", |
770 | btrfs_super_total_blocks(disk_super), | |
771 | btrfs_super_root_dir(disk_super)); | |
772 | ||
c5739bba CM |
773 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
774 | tree_root); | |
d6e4a428 CM |
775 | bi = BTRFS_I(inode); |
776 | bi->location.objectid = inode->i_ino; | |
777 | bi->location.offset = 0; | |
778 | bi->location.flags = 0; | |
0f7d52f4 | 779 | bi->root = tree_root; |
d6e4a428 CM |
780 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
781 | ||
2e635a27 CM |
782 | if (!inode) |
783 | return -ENOMEM; | |
e20d96d6 CM |
784 | if (inode->i_state & I_NEW) { |
785 | btrfs_read_locked_inode(inode); | |
786 | unlock_new_inode(inode); | |
787 | } | |
2e635a27 | 788 | |
e20d96d6 CM |
789 | root_dentry = d_alloc_root(inode); |
790 | if (!root_dentry) { | |
2e635a27 CM |
791 | iput(inode); |
792 | return -ENOMEM; | |
793 | } | |
e20d96d6 CM |
794 | sb->s_root = root_dentry; |
795 | ||
2e635a27 CM |
796 | return 0; |
797 | } | |
798 | ||
4730a4bc CM |
799 | static int btrfs_write_inode(struct inode *inode, int wait) |
800 | { | |
d6e4a428 | 801 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 802 | struct btrfs_trans_handle *trans; |
b5133862 CM |
803 | int ret = 0; |
804 | ||
805 | if (wait) { | |
806 | mutex_lock(&root->fs_info->fs_mutex); | |
807 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 808 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
809 | ret = btrfs_commit_transaction(trans, root); |
810 | mutex_unlock(&root->fs_info->fs_mutex); | |
811 | } | |
812 | return ret; | |
813 | } | |
814 | ||
815 | static void btrfs_dirty_inode(struct inode *inode) | |
816 | { | |
817 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
818 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
819 | |
820 | mutex_lock(&root->fs_info->fs_mutex); | |
821 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 822 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
823 | btrfs_update_inode(trans, root, inode); |
824 | btrfs_end_transaction(trans, root); | |
4730a4bc | 825 | mutex_unlock(&root->fs_info->fs_mutex); |
35b7e476 | 826 | btrfs_btree_balance_dirty(root); |
4730a4bc CM |
827 | } |
828 | ||
d5719762 | 829 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f | 830 | struct btrfs_root *root, |
31f3c99b CM |
831 | u64 objectid, |
832 | struct btrfs_block_group_cache *group, | |
833 | int mode) | |
d5719762 CM |
834 | { |
835 | struct inode *inode; | |
836 | struct btrfs_inode_item inode_item; | |
1b05da2e | 837 | struct btrfs_key *location; |
d5719762 | 838 | int ret; |
de428b63 | 839 | int owner; |
d5719762 | 840 | |
2619ba1f | 841 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
842 | if (!inode) |
843 | return ERR_PTR(-ENOMEM); | |
844 | ||
2619ba1f | 845 | BTRFS_I(inode)->root = root; |
de428b63 CM |
846 | if (mode & S_IFDIR) |
847 | owner = 0; | |
848 | else | |
849 | owner = 1; | |
850 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
31f3c99b | 851 | BTRFS_I(inode)->block_group = group; |
d5719762 CM |
852 | |
853 | inode->i_uid = current->fsuid; | |
854 | inode->i_gid = current->fsgid; | |
855 | inode->i_mode = mode; | |
856 | inode->i_ino = objectid; | |
857 | inode->i_blocks = 0; | |
c5739bba | 858 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 859 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
860 | location = &BTRFS_I(inode)->location; |
861 | location->objectid = objectid; | |
862 | location->flags = 0; | |
863 | location->offset = 0; | |
864 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
865 | |
866 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
867 | BUG_ON(ret); | |
868 | ||
869 | insert_inode_hash(inode); | |
d5719762 CM |
870 | return inode; |
871 | } | |
872 | ||
873 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
874 | struct dentry *dentry, struct inode *inode) | |
875 | { | |
876 | int ret; | |
d6e4a428 CM |
877 | struct btrfs_key key; |
878 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
879 | key.objectid = inode->i_ino; | |
880 | key.flags = 0; | |
881 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
882 | key.offset = 0; | |
883 | ||
884 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
885 | dentry->d_name.name, dentry->d_name.len, |
886 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 887 | &key, 0); |
4730a4bc | 888 | if (ret == 0) { |
5f26f772 | 889 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 890 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
891 | dentry->d_parent->d_inode); |
892 | } | |
d5719762 CM |
893 | return ret; |
894 | } | |
895 | ||
896 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
897 | struct dentry *dentry, struct inode *inode) | |
898 | { | |
899 | int err = btrfs_add_link(trans, dentry, inode); | |
900 | if (!err) { | |
901 | d_instantiate(dentry, inode); | |
902 | return 0; | |
903 | } | |
2c90e5d6 CM |
904 | if (err > 0) |
905 | err = -EEXIST; | |
d5719762 CM |
906 | return err; |
907 | } | |
908 | ||
909 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
910 | int mode, struct nameidata *nd) | |
911 | { | |
912 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 913 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
914 | struct inode *inode; |
915 | int err; | |
134e9731 | 916 | int drop_inode = 0; |
2619ba1f | 917 | u64 objectid; |
d5719762 | 918 | |
d561c025 | 919 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 920 | trans = btrfs_start_transaction(root, 1); |
31f3c99b | 921 | btrfs_set_trans_block_group(trans, dir); |
2619ba1f CM |
922 | |
923 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
924 | if (err) { | |
925 | err = -ENOSPC; | |
926 | goto out_unlock; | |
927 | } | |
928 | ||
31f3c99b CM |
929 | inode = btrfs_new_inode(trans, root, objectid, |
930 | BTRFS_I(dir)->block_group, mode); | |
d5719762 CM |
931 | err = PTR_ERR(inode); |
932 | if (IS_ERR(inode)) | |
d561c025 | 933 | goto out_unlock; |
31f3c99b CM |
934 | |
935 | btrfs_set_trans_block_group(trans, inode); | |
d5719762 | 936 | err = btrfs_add_nondir(trans, dentry, inode); |
134e9731 CM |
937 | if (err) |
938 | drop_inode = 1; | |
dee26a9f CM |
939 | else { |
940 | inode->i_mapping->a_ops = &btrfs_aops; | |
941 | inode->i_fop = &btrfs_file_operations; | |
942 | inode->i_op = &btrfs_file_inode_operations; | |
943 | } | |
d5719762 | 944 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
945 | btrfs_update_inode_block_group(trans, inode); |
946 | btrfs_update_inode_block_group(trans, dir); | |
d561c025 | 947 | out_unlock: |
22b0ebda | 948 | btrfs_end_transaction(trans, root); |
d561c025 | 949 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 950 | |
134e9731 CM |
951 | if (drop_inode) { |
952 | inode_dec_link_count(inode); | |
953 | iput(inode); | |
954 | } | |
35b7e476 | 955 | btrfs_btree_balance_dirty(root); |
d5719762 CM |
956 | return err; |
957 | } | |
958 | ||
f7922033 | 959 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
960 | struct btrfs_root *root, |
961 | u64 objectid, u64 dirid) | |
f7922033 | 962 | { |
f7922033 CM |
963 | int ret; |
964 | char buf[2]; | |
d6e4a428 CM |
965 | struct btrfs_key key; |
966 | ||
f7922033 CM |
967 | buf[0] = '.'; |
968 | buf[1] = '.'; | |
969 | ||
2619ba1f | 970 | key.objectid = objectid; |
d6e4a428 CM |
971 | key.offset = 0; |
972 | key.flags = 0; | |
973 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
974 | ||
2619ba1f | 975 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 976 | &key, 1); |
f7922033 CM |
977 | if (ret) |
978 | goto error; | |
2619ba1f CM |
979 | key.objectid = dirid; |
980 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 981 | &key, 1); |
4730a4bc CM |
982 | if (ret) |
983 | goto error; | |
f7922033 CM |
984 | error: |
985 | return ret; | |
986 | } | |
987 | ||
988 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
989 | { | |
990 | struct inode *inode; | |
991 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 992 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
993 | int err = 0; |
994 | int drop_on_err = 0; | |
2619ba1f | 995 | u64 objectid; |
f7922033 CM |
996 | |
997 | mutex_lock(&root->fs_info->fs_mutex); | |
998 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 999 | btrfs_set_trans_block_group(trans, dir); |
f7922033 CM |
1000 | if (IS_ERR(trans)) { |
1001 | err = PTR_ERR(trans); | |
1002 | goto out_unlock; | |
1003 | } | |
2619ba1f CM |
1004 | |
1005 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1006 | if (err) { | |
1007 | err = -ENOSPC; | |
1008 | goto out_unlock; | |
1009 | } | |
1010 | ||
31f3c99b CM |
1011 | inode = btrfs_new_inode(trans, root, objectid, |
1012 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
f7922033 CM |
1013 | if (IS_ERR(inode)) { |
1014 | err = PTR_ERR(inode); | |
1015 | goto out_fail; | |
1016 | } | |
1017 | drop_on_err = 1; | |
1018 | inode->i_op = &btrfs_dir_inode_operations; | |
1019 | inode->i_fop = &btrfs_dir_file_operations; | |
31f3c99b | 1020 | btrfs_set_trans_block_group(trans, inode); |
f7922033 | 1021 | |
2619ba1f CM |
1022 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
1023 | if (err) | |
1024 | goto out_fail; | |
1025 | ||
1026 | inode->i_size = 6; | |
1027 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
1028 | if (err) |
1029 | goto out_fail; | |
1030 | err = btrfs_add_link(trans, dentry, inode); | |
1031 | if (err) | |
1032 | goto out_fail; | |
1033 | d_instantiate(dentry, inode); | |
f7922033 | 1034 | drop_on_err = 0; |
cd1bc465 | 1035 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1036 | btrfs_update_inode_block_group(trans, inode); |
1037 | btrfs_update_inode_block_group(trans, dir); | |
f7922033 CM |
1038 | |
1039 | out_fail: | |
1040 | btrfs_end_transaction(trans, root); | |
1041 | out_unlock: | |
1042 | mutex_unlock(&root->fs_info->fs_mutex); | |
1043 | if (drop_on_err) | |
1044 | iput(inode); | |
35b7e476 | 1045 | btrfs_btree_balance_dirty(root); |
f7922033 CM |
1046 | return err; |
1047 | } | |
1048 | ||
8fd17795 CM |
1049 | static int btrfs_sync_file(struct file *file, |
1050 | struct dentry *dentry, int datasync) | |
1051 | { | |
1052 | struct inode *inode = dentry->d_inode; | |
1053 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1054 | int ret; | |
1055 | struct btrfs_trans_handle *trans; | |
1056 | ||
1057 | mutex_lock(&root->fs_info->fs_mutex); | |
1058 | trans = btrfs_start_transaction(root, 1); | |
1059 | if (!trans) { | |
1060 | ret = -ENOMEM; | |
1061 | goto out; | |
1062 | } | |
1063 | ret = btrfs_commit_transaction(trans, root); | |
1064 | mutex_unlock(&root->fs_info->fs_mutex); | |
1065 | out: | |
1066 | return ret > 0 ? EIO : ret; | |
1067 | } | |
1068 | ||
d5719762 CM |
1069 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
1070 | { | |
1071 | struct btrfs_trans_handle *trans; | |
1072 | struct btrfs_root *root; | |
1073 | int ret; | |
d98237b3 | 1074 | root = btrfs_sb(sb); |
df2ce34c | 1075 | |
d5719762 | 1076 | sb->s_dirt = 0; |
d561c025 | 1077 | if (!wait) { |
7cfcc17e | 1078 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
1079 | return 0; |
1080 | } | |
d561c025 | 1081 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
1082 | trans = btrfs_start_transaction(root, 1); |
1083 | ret = btrfs_commit_transaction(trans, root); | |
1084 | sb->s_dirt = 0; | |
1085 | BUG_ON(ret); | |
1086 | printk("btrfs sync_fs\n"); | |
d561c025 | 1087 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
1088 | return 0; |
1089 | } | |
1090 | ||
75dfe396 | 1091 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1092 | struct buffer_head *result, int create) |
1093 | { | |
1094 | int ret; | |
1095 | int err = 0; | |
1096 | u64 blocknr; | |
1097 | u64 extent_start = 0; | |
1098 | u64 extent_end = 0; | |
1099 | u64 objectid = inode->i_ino; | |
236454df | 1100 | u32 found_type; |
5caf2a00 | 1101 | struct btrfs_path *path; |
d6e4a428 | 1102 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1103 | struct btrfs_file_extent_item *item; |
1104 | struct btrfs_leaf *leaf; | |
1105 | struct btrfs_disk_key *found_key; | |
1106 | ||
5caf2a00 CM |
1107 | path = btrfs_alloc_path(); |
1108 | BUG_ON(!path); | |
1109 | btrfs_init_path(path); | |
6567e837 | 1110 | if (create) { |
6567e837 CM |
1111 | WARN_ON(1); |
1112 | } | |
dee26a9f | 1113 | |
236454df | 1114 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1115 | inode->i_ino, |
236454df | 1116 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1117 | if (ret < 0) { |
dee26a9f CM |
1118 | err = ret; |
1119 | goto out; | |
1120 | } | |
1121 | ||
1122 | if (ret != 0) { | |
5caf2a00 CM |
1123 | if (path->slots[0] == 0) { |
1124 | btrfs_release_path(root, path); | |
236454df | 1125 | goto out; |
dee26a9f | 1126 | } |
5caf2a00 | 1127 | path->slots[0]--; |
dee26a9f CM |
1128 | } |
1129 | ||
5caf2a00 | 1130 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1131 | struct btrfs_file_extent_item); |
5caf2a00 | 1132 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1133 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1134 | blocknr += btrfs_file_extent_offset(item); | |
1135 | ||
dee26a9f | 1136 | /* are we inside the extent that was found? */ |
5caf2a00 | 1137 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1138 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1139 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1140 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1141 | extent_end = 0; |
1142 | extent_start = 0; | |
dee26a9f CM |
1143 | goto out; |
1144 | } | |
236454df CM |
1145 | found_type = btrfs_file_extent_type(item); |
1146 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1147 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1148 | extent_start = extent_start >> inode->i_blkbits; | |
1149 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
1150 | if (iblock >= extent_start && iblock < extent_end) { | |
1151 | err = 0; | |
1152 | btrfs_map_bh_to_logical(root, result, blocknr + | |
1153 | iblock - extent_start); | |
1154 | goto out; | |
1155 | } | |
1156 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1157 | char *ptr; | |
1158 | char *map; | |
1159 | u32 size; | |
1160 | size = btrfs_file_extent_inline_len(leaf->items + | |
1161 | path->slots[0]); | |
1162 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1163 | extent_start >>= inode->i_blkbits; | |
1164 | if (iblock < extent_start || iblock > extent_end) { | |
1165 | goto out; | |
1166 | } | |
1167 | ptr = btrfs_file_extent_inline_start(item); | |
1168 | map = kmap(result->b_page); | |
1169 | memcpy(map, ptr, size); | |
1170 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1171 | flush_dcache_page(result->b_page); | |
1172 | kunmap(result->b_page); | |
1173 | set_buffer_uptodate(result); | |
1174 | SetPageChecked(result->b_page); | |
1175 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1176 | } |
dee26a9f | 1177 | out: |
5caf2a00 | 1178 | btrfs_free_path(path); |
75dfe396 CM |
1179 | return err; |
1180 | } | |
1181 | ||
1182 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1183 | struct buffer_head *result, int create) | |
1184 | { | |
1185 | int err; | |
d6e4a428 | 1186 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1187 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1188 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1189 | mutex_unlock(&root->fs_info->fs_mutex); |
1190 | return err; | |
1191 | } | |
1192 | ||
1193 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1194 | unsigned from, unsigned to) | |
1195 | { | |
6407bf6d | 1196 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1197 | } |
1198 | ||
d561c025 CM |
1199 | static void btrfs_write_super(struct super_block *sb) |
1200 | { | |
1201 | btrfs_sync_fs(sb, 1); | |
1202 | } | |
1203 | ||
dee26a9f CM |
1204 | static int btrfs_readpage(struct file *file, struct page *page) |
1205 | { | |
1206 | return mpage_readpage(page, btrfs_get_block); | |
1207 | } | |
1208 | ||
236454df CM |
1209 | /* |
1210 | * While block_write_full_page is writing back the dirty buffers under | |
1211 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1212 | * again at any time. We handle that by only looking at the buffer | |
1213 | * state inside lock_buffer(). | |
1214 | * | |
1215 | * If block_write_full_page() is called for regular writeback | |
1216 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1217 | * locked buffer. This only can happen if someone has written the buffer | |
1218 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1219 | * prevents this contention from occurring. | |
1220 | */ | |
1221 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1222 | struct writeback_control *wbc) | |
1223 | { | |
1224 | int err; | |
1225 | sector_t block; | |
1226 | sector_t last_block; | |
1227 | struct buffer_head *bh, *head; | |
1228 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1229 | int nr_underway = 0; | |
1230 | ||
1231 | BUG_ON(!PageLocked(page)); | |
1232 | ||
1233 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1234 | ||
1235 | if (!page_has_buffers(page)) { | |
1236 | create_empty_buffers(page, blocksize, | |
1237 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1242 | * here, and the (potentially unmapped) buffers may become dirty at | |
1243 | * any time. If a buffer becomes dirty here after we've inspected it | |
1244 | * then we just miss that fact, and the page stays dirty. | |
1245 | * | |
1246 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1247 | * handle that here by just cleaning them. | |
1248 | */ | |
1249 | ||
1250 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1251 | head = page_buffers(page); | |
1252 | bh = head; | |
1253 | ||
1254 | /* | |
1255 | * Get all the dirty buffers mapped to disk addresses and | |
1256 | * handle any aliases from the underlying blockdev's mapping. | |
1257 | */ | |
1258 | do { | |
1259 | if (block > last_block) { | |
1260 | /* | |
1261 | * mapped buffers outside i_size will occur, because | |
1262 | * this page can be outside i_size when there is a | |
1263 | * truncate in progress. | |
1264 | */ | |
1265 | /* | |
1266 | * The buffer was zeroed by block_write_full_page() | |
1267 | */ | |
1268 | clear_buffer_dirty(bh); | |
1269 | set_buffer_uptodate(bh); | |
1270 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1271 | WARN_ON(bh->b_size != blocksize); | |
1272 | err = btrfs_get_block(inode, block, bh, 0); | |
35b7e476 CM |
1273 | if (err) { |
1274 | printk("writepage going to recovery err %d\n", err); | |
236454df | 1275 | goto recover; |
35b7e476 | 1276 | } |
236454df CM |
1277 | if (buffer_new(bh)) { |
1278 | /* blockdev mappings never come here */ | |
1279 | clear_buffer_new(bh); | |
236454df CM |
1280 | } |
1281 | } | |
1282 | bh = bh->b_this_page; | |
1283 | block++; | |
1284 | } while (bh != head); | |
1285 | ||
1286 | do { | |
1287 | if (!buffer_mapped(bh)) | |
1288 | continue; | |
1289 | /* | |
1290 | * If it's a fully non-blocking write attempt and we cannot | |
1291 | * lock the buffer then redirty the page. Note that this can | |
1292 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1293 | * activity, but those code paths have their own higher-level | |
1294 | * throttling. | |
1295 | */ | |
1296 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1297 | lock_buffer(bh); | |
1298 | } else if (test_set_buffer_locked(bh)) { | |
1299 | redirty_page_for_writepage(wbc, page); | |
1300 | continue; | |
1301 | } | |
1302 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1303 | mark_buffer_async_write(bh); | |
1304 | } else { | |
1305 | unlock_buffer(bh); | |
1306 | } | |
1307 | } while ((bh = bh->b_this_page) != head); | |
1308 | ||
1309 | /* | |
1310 | * The page and its buffers are protected by PageWriteback(), so we can | |
1311 | * drop the bh refcounts early. | |
1312 | */ | |
1313 | BUG_ON(PageWriteback(page)); | |
1314 | set_page_writeback(page); | |
1315 | ||
1316 | do { | |
1317 | struct buffer_head *next = bh->b_this_page; | |
1318 | if (buffer_async_write(bh)) { | |
1319 | submit_bh(WRITE, bh); | |
1320 | nr_underway++; | |
1321 | } | |
1322 | bh = next; | |
1323 | } while (bh != head); | |
1324 | unlock_page(page); | |
1325 | ||
1326 | err = 0; | |
1327 | done: | |
1328 | if (nr_underway == 0) { | |
1329 | /* | |
1330 | * The page was marked dirty, but the buffers were | |
1331 | * clean. Someone wrote them back by hand with | |
1332 | * ll_rw_block/submit_bh. A rare case. | |
1333 | */ | |
1334 | int uptodate = 1; | |
1335 | do { | |
1336 | if (!buffer_uptodate(bh)) { | |
1337 | uptodate = 0; | |
1338 | break; | |
1339 | } | |
1340 | bh = bh->b_this_page; | |
1341 | } while (bh != head); | |
1342 | if (uptodate) | |
1343 | SetPageUptodate(page); | |
1344 | end_page_writeback(page); | |
236454df CM |
1345 | } |
1346 | return err; | |
1347 | ||
1348 | recover: | |
1349 | /* | |
1350 | * ENOSPC, or some other error. We may already have added some | |
1351 | * blocks to the file, so we need to write these out to avoid | |
1352 | * exposing stale data. | |
1353 | * The page is currently locked and not marked for writeback | |
1354 | */ | |
1355 | bh = head; | |
1356 | /* Recovery: lock and submit the mapped buffers */ | |
1357 | do { | |
1358 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1359 | lock_buffer(bh); | |
1360 | mark_buffer_async_write(bh); | |
1361 | } else { | |
1362 | /* | |
1363 | * The buffer may have been set dirty during | |
1364 | * attachment to a dirty page. | |
1365 | */ | |
1366 | clear_buffer_dirty(bh); | |
1367 | } | |
1368 | } while ((bh = bh->b_this_page) != head); | |
1369 | SetPageError(page); | |
1370 | BUG_ON(PageWriteback(page)); | |
1371 | set_page_writeback(page); | |
1372 | do { | |
1373 | struct buffer_head *next = bh->b_this_page; | |
1374 | if (buffer_async_write(bh)) { | |
1375 | clear_buffer_dirty(bh); | |
1376 | submit_bh(WRITE, bh); | |
1377 | nr_underway++; | |
1378 | } | |
1379 | bh = next; | |
1380 | } while (bh != head); | |
1381 | unlock_page(page); | |
1382 | goto done; | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * The generic ->writepage function for buffer-backed address_spaces | |
1387 | */ | |
dee26a9f CM |
1388 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1389 | { | |
236454df CM |
1390 | struct inode * const inode = page->mapping->host; |
1391 | loff_t i_size = i_size_read(inode); | |
1392 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1393 | unsigned offset; | |
1394 | void *kaddr; | |
1395 | ||
1396 | /* Is the page fully inside i_size? */ | |
1397 | if (page->index < end_index) | |
1398 | return __btrfs_write_full_page(inode, page, wbc); | |
1399 | ||
1400 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1401 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1402 | if (page->index >= end_index+1 || !offset) { | |
1403 | /* | |
1404 | * The page may have dirty, unmapped buffers. For example, | |
1405 | * they may have been added in ext3_writepage(). Make them | |
1406 | * freeable here, so the page does not leak. | |
1407 | */ | |
1408 | block_invalidatepage(page, 0); | |
1409 | unlock_page(page); | |
1410 | return 0; /* don't care */ | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * The page straddles i_size. It must be zeroed out on each and every | |
1415 | * writepage invokation because it may be mmapped. "A file is mapped | |
1416 | * in multiples of the page size. For a file that is not a multiple of | |
1417 | * the page size, the remaining memory is zeroed when mapped, and | |
1418 | * writes to that region are not written out to the file." | |
1419 | */ | |
1420 | kaddr = kmap_atomic(page, KM_USER0); | |
1421 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1422 | flush_dcache_page(page); | |
1423 | kunmap_atomic(kaddr, KM_USER0); | |
1424 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1425 | } |
d561c025 | 1426 | |
f4b9aa8d CM |
1427 | static void btrfs_truncate(struct inode *inode) |
1428 | { | |
d6e4a428 | 1429 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1430 | int ret; |
1431 | struct btrfs_trans_handle *trans; | |
1432 | ||
1433 | if (!S_ISREG(inode->i_mode)) | |
1434 | return; | |
1435 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1436 | return; | |
1437 | ||
e8f05c45 | 1438 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1439 | |
1440 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1441 | mutex_lock(&root->fs_info->fs_mutex); | |
1442 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1443 | btrfs_set_trans_block_group(trans, inode); |
f4b9aa8d CM |
1444 | ret = btrfs_truncate_in_trans(trans, root, inode); |
1445 | BUG_ON(ret); | |
35b7e476 | 1446 | btrfs_update_inode(trans, root, inode); |
f4b9aa8d CM |
1447 | ret = btrfs_end_transaction(trans, root); |
1448 | BUG_ON(ret); | |
1449 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 1450 | btrfs_btree_balance_dirty(root); |
f4b9aa8d CM |
1451 | } |
1452 | ||
236454df CM |
1453 | /* |
1454 | * Make sure any changes to nobh_commit_write() are reflected in | |
1455 | * nobh_truncate_page(), since it doesn't call commit_write(). | |
1456 | */ | |
1457 | static int btrfs_commit_write(struct file *file, struct page *page, | |
1458 | unsigned from, unsigned to) | |
1459 | { | |
1460 | struct inode *inode = page->mapping->host; | |
1461 | struct buffer_head *bh; | |
1462 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1463 | ||
1464 | SetPageUptodate(page); | |
1465 | bh = page_buffers(page); | |
1466 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
1467 | set_page_dirty(page); | |
1468 | } | |
1469 | if (pos > inode->i_size) { | |
1470 | i_size_write(inode, pos); | |
1471 | mark_inode_dirty(inode); | |
1472 | } | |
1473 | return 0; | |
1474 | } | |
1475 | ||
75dfe396 CM |
1476 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1477 | struct page **prepared_pages, | |
1478 | const char __user * buf) | |
1479 | { | |
1480 | long page_fault = 0; | |
1481 | int i; | |
1482 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1483 | ||
1484 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1485 | size_t count = min_t(size_t, | |
1486 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1487 | struct page *page = prepared_pages[i]; | |
1488 | fault_in_pages_readable(buf, count); | |
1489 | ||
1490 | /* Copy data from userspace to the current page */ | |
1491 | kmap(page); | |
1492 | page_fault = __copy_from_user(page_address(page) + offset, | |
1493 | buf, count); | |
1494 | /* Flush processor's dcache for this page */ | |
1495 | flush_dcache_page(page); | |
1496 | kunmap(page); | |
1497 | buf += count; | |
1498 | write_bytes -= count; | |
1499 | ||
1500 | if (page_fault) | |
1501 | break; | |
1502 | } | |
1503 | return page_fault ? -EFAULT : 0; | |
1504 | } | |
1505 | ||
1506 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1507 | { | |
1508 | size_t i; | |
1509 | for (i = 0; i < num_pages; i++) { | |
1510 | if (!pages[i]) | |
1511 | break; | |
1512 | unlock_page(pages[i]); | |
1513 | mark_page_accessed(pages[i]); | |
1514 | page_cache_release(pages[i]); | |
1515 | } | |
1516 | } | |
1517 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1518 | struct btrfs_root *root, | |
1519 | struct file *file, | |
1520 | struct page **pages, | |
1521 | size_t num_pages, | |
1522 | loff_t pos, | |
1523 | size_t write_bytes) | |
1524 | { | |
1525 | int i; | |
1526 | int offset; | |
1527 | int err = 0; | |
1528 | int ret; | |
1529 | int this_write; | |
f254e52c | 1530 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1531 | struct buffer_head *bh; |
1532 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1533 | |
1534 | for (i = 0; i < num_pages; i++) { | |
1535 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1536 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1537 | /* FIXME, one block at a time */ |
1538 | ||
1539 | mutex_lock(&root->fs_info->fs_mutex); | |
1540 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1541 | btrfs_set_trans_block_group(trans, inode); |
236454df CM |
1542 | |
1543 | bh = page_buffers(pages[i]); | |
1544 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1545 | struct btrfs_key key; | |
1546 | struct btrfs_path *path; | |
1547 | char *ptr; | |
1548 | u32 datasize; | |
1549 | ||
1550 | path = btrfs_alloc_path(); | |
1551 | BUG_ON(!path); | |
1552 | key.objectid = inode->i_ino; | |
1553 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1554 | key.flags = 0; | |
1555 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1556 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1557 | datasize = offset + | |
1558 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1559 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1560 | datasize); | |
1561 | BUG_ON(ret); | |
1562 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1563 | path->slots[0], struct btrfs_file_extent_item); | |
1564 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1565 | btrfs_set_file_extent_type(ei, | |
1566 | BTRFS_FILE_EXTENT_INLINE); | |
1567 | ptr = btrfs_file_extent_inline_start(ei); | |
098f59c2 CM |
1568 | btrfs_memcpy(root, path->nodes[0]->b_data, |
1569 | ptr, bh->b_data, offset + write_bytes); | |
236454df CM |
1570 | mark_buffer_dirty(path->nodes[0]); |
1571 | btrfs_free_path(path); | |
1572 | } else { | |
1573 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
f254e52c CM |
1574 | pages[i]->index << PAGE_CACHE_SHIFT, |
1575 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1576 | kunmap(pages[i]); |
1577 | } | |
f254e52c | 1578 | SetPageChecked(pages[i]); |
e37c9e69 | 1579 | // btrfs_update_inode_block_group(trans, inode); |
f254e52c CM |
1580 | ret = btrfs_end_transaction(trans, root); |
1581 | BUG_ON(ret); | |
1582 | mutex_unlock(&root->fs_info->fs_mutex); | |
1583 | ||
236454df | 1584 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1585 | offset + this_write); |
1586 | pos += this_write; | |
1587 | if (ret) { | |
1588 | err = ret; | |
1589 | goto failed; | |
1590 | } | |
1591 | WARN_ON(this_write > write_bytes); | |
1592 | write_bytes -= this_write; | |
1593 | } | |
1594 | failed: | |
1595 | return err; | |
1596 | } | |
1597 | ||
b18c6685 CM |
1598 | static int drop_extents(struct btrfs_trans_handle *trans, |
1599 | struct btrfs_root *root, | |
1600 | struct inode *inode, | |
de428b63 | 1601 | u64 start, u64 end, u64 *hint_block) |
b18c6685 CM |
1602 | { |
1603 | int ret; | |
1604 | struct btrfs_key key; | |
1605 | struct btrfs_leaf *leaf; | |
1606 | int slot; | |
1607 | struct btrfs_file_extent_item *extent; | |
236454df | 1608 | u64 extent_end = 0; |
b18c6685 CM |
1609 | int keep; |
1610 | struct btrfs_file_extent_item old; | |
1611 | struct btrfs_path *path; | |
1612 | u64 search_start = start; | |
1613 | int bookend; | |
236454df CM |
1614 | int found_type; |
1615 | int found_extent; | |
1616 | int found_inline; | |
1617 | ||
b18c6685 CM |
1618 | path = btrfs_alloc_path(); |
1619 | if (!path) | |
1620 | return -ENOMEM; | |
a429e513 CM |
1621 | while(1) { |
1622 | btrfs_release_path(root, path); | |
1623 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1624 | search_start, -1); | |
1625 | if (ret < 0) | |
70b2befd | 1626 | goto out; |
a429e513 CM |
1627 | if (ret > 0) { |
1628 | if (path->slots[0] == 0) { | |
236454df | 1629 | ret = 0; |
a429e513 CM |
1630 | goto out; |
1631 | } | |
1632 | path->slots[0]--; | |
70b2befd | 1633 | } |
b18c6685 CM |
1634 | keep = 0; |
1635 | bookend = 0; | |
236454df CM |
1636 | found_extent = 0; |
1637 | found_inline = 0; | |
1638 | extent = NULL; | |
b18c6685 CM |
1639 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1640 | slot = path->slots[0]; | |
1641 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1642 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1643 | ret = 0; | |
1644 | goto out; | |
1645 | } | |
236454df CM |
1646 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1647 | ret = 0; | |
1648 | goto out; | |
1649 | } | |
1650 | extent = btrfs_item_ptr(leaf, slot, | |
1651 | struct btrfs_file_extent_item); | |
1652 | found_type = btrfs_file_extent_type(extent); | |
1653 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1654 | extent_end = key.offset + | |
1655 | (btrfs_file_extent_num_blocks(extent) << | |
1656 | inode->i_blkbits); | |
1657 | found_extent = 1; | |
1658 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1659 | found_inline = 1; | |
1660 | extent_end = key.offset + | |
1661 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1662 | } | |
1663 | ||
1664 | if (!found_extent && !found_inline) { | |
1665 | ret = 0; | |
a429e513 | 1666 | goto out; |
236454df CM |
1667 | } |
1668 | ||
1669 | if (search_start >= extent_end) { | |
1670 | ret = 0; | |
a429e513 | 1671 | goto out; |
236454df CM |
1672 | } |
1673 | ||
a429e513 | 1674 | search_start = extent_end; |
b18c6685 CM |
1675 | |
1676 | if (end < extent_end && end >= key.offset) { | |
236454df CM |
1677 | if (found_extent) { |
1678 | memcpy(&old, extent, sizeof(old)); | |
1679 | ret = btrfs_inc_extent_ref(trans, root, | |
1680 | btrfs_file_extent_disk_blocknr(&old), | |
1681 | btrfs_file_extent_disk_num_blocks(&old)); | |
1682 | BUG_ON(ret); | |
1683 | } | |
1684 | WARN_ON(found_inline); | |
b18c6685 CM |
1685 | bookend = 1; |
1686 | } | |
1687 | ||
1688 | if (start > key.offset) { | |
1689 | u64 new_num; | |
a429e513 | 1690 | u64 old_num; |
b18c6685 CM |
1691 | /* truncate existing extent */ |
1692 | keep = 1; | |
1693 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1694 | if (found_extent) { |
1695 | new_num = (start - key.offset) >> | |
1696 | inode->i_blkbits; | |
1697 | old_num = btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1698 | *hint_block = |
1699 | btrfs_file_extent_disk_blocknr(extent); | |
236454df CM |
1700 | inode->i_blocks -= (old_num - new_num) << 3; |
1701 | btrfs_set_file_extent_num_blocks(extent, | |
1702 | new_num); | |
1703 | mark_buffer_dirty(path->nodes[0]); | |
1704 | } else { | |
1705 | WARN_ON(1); | |
236454df | 1706 | } |
b18c6685 CM |
1707 | } |
1708 | if (!keep) { | |
236454df CM |
1709 | u64 disk_blocknr = 0; |
1710 | u64 disk_num_blocks = 0; | |
1711 | u64 extent_num_blocks = 0; | |
1712 | if (found_extent) { | |
1713 | disk_blocknr = | |
1714 | btrfs_file_extent_disk_blocknr(extent); | |
1715 | disk_num_blocks = | |
1716 | btrfs_file_extent_disk_num_blocks(extent); | |
1717 | extent_num_blocks = | |
1718 | btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1719 | *hint_block = |
1720 | btrfs_file_extent_disk_blocknr(extent); | |
236454df | 1721 | } |
b18c6685 CM |
1722 | ret = btrfs_del_item(trans, root, path); |
1723 | BUG_ON(ret); | |
1724 | btrfs_release_path(root, path); | |
098f59c2 | 1725 | extent = NULL; |
236454df | 1726 | if (found_extent) { |
098f59c2 | 1727 | inode->i_blocks -= extent_num_blocks << 3; |
236454df CM |
1728 | ret = btrfs_free_extent(trans, root, |
1729 | disk_blocknr, | |
1730 | disk_num_blocks, 0); | |
1731 | } | |
b18c6685 CM |
1732 | |
1733 | BUG_ON(ret); | |
1734 | if (!bookend && search_start >= end) { | |
1735 | ret = 0; | |
1736 | goto out; | |
1737 | } | |
1738 | if (!bookend) | |
a429e513 | 1739 | continue; |
b18c6685 | 1740 | } |
236454df | 1741 | if (bookend && found_extent) { |
b18c6685 CM |
1742 | /* create bookend */ |
1743 | struct btrfs_key ins; | |
b18c6685 CM |
1744 | ins.objectid = inode->i_ino; |
1745 | ins.offset = end; | |
1746 | ins.flags = 0; | |
1747 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1748 | ||
1749 | btrfs_release_path(root, path); | |
b18c6685 CM |
1750 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1751 | sizeof(*extent)); | |
1752 | BUG_ON(ret); | |
1753 | extent = btrfs_item_ptr( | |
1754 | btrfs_buffer_leaf(path->nodes[0]), | |
1755 | path->slots[0], | |
1756 | struct btrfs_file_extent_item); | |
1757 | btrfs_set_file_extent_disk_blocknr(extent, | |
1758 | btrfs_file_extent_disk_blocknr(&old)); | |
1759 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1760 | btrfs_file_extent_disk_num_blocks(&old)); | |
1761 | ||
1762 | btrfs_set_file_extent_offset(extent, | |
1763 | btrfs_file_extent_offset(&old) + | |
1764 | ((end - key.offset) >> inode->i_blkbits)); | |
1765 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
1766 | (end - key.offset) >> inode->i_blkbits); | |
1767 | btrfs_set_file_extent_num_blocks(extent, | |
1768 | btrfs_file_extent_num_blocks(&old) - | |
1769 | ((end - key.offset) >> inode->i_blkbits)); | |
1770 | ||
236454df CM |
1771 | btrfs_set_file_extent_type(extent, |
1772 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1773 | btrfs_set_file_extent_generation(extent, |
1774 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1775 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a429e513 CM |
1776 | inode->i_blocks += |
1777 | btrfs_file_extent_num_blocks(extent) << 3; | |
b18c6685 | 1778 | ret = 0; |
70b2befd | 1779 | goto out; |
b18c6685 | 1780 | } |
b18c6685 | 1781 | } |
b18c6685 | 1782 | out: |
b18c6685 CM |
1783 | btrfs_free_path(path); |
1784 | return ret; | |
1785 | } | |
1786 | ||
1787 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1788 | struct file *file, |
1789 | struct page **pages, | |
1790 | size_t num_pages, | |
1791 | loff_t pos, | |
2932f3ec CM |
1792 | unsigned long first_index, |
1793 | unsigned long last_index, | |
6567e837 CM |
1794 | size_t write_bytes, |
1795 | u64 alloc_extent_start) | |
75dfe396 CM |
1796 | { |
1797 | int i; | |
1798 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1799 | struct inode *inode = file->f_path.dentry->d_inode; | |
1800 | int offset; | |
1801 | int err = 0; | |
75dfe396 | 1802 | int this_write; |
6567e837 CM |
1803 | struct buffer_head *bh; |
1804 | struct buffer_head *head; | |
75dfe396 CM |
1805 | loff_t isize = i_size_read(inode); |
1806 | ||
1807 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1808 | ||
1809 | for (i = 0; i < num_pages; i++) { | |
1810 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1811 | if (!pages[i]) { | |
1812 | err = -ENOMEM; | |
1813 | goto failed_release; | |
1814 | } | |
35b7e476 CM |
1815 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
1816 | wait_on_page_writeback(pages[i]); | |
75dfe396 CM |
1817 | offset = pos & (PAGE_CACHE_SIZE -1); |
1818 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
35b7e476 CM |
1819 | if (!page_has_buffers(pages[i])) { |
1820 | create_empty_buffers(pages[i], | |
1821 | root->fs_info->sb->s_blocksize, | |
1822 | (1 << BH_Uptodate)); | |
1823 | } | |
6567e837 CM |
1824 | head = page_buffers(pages[i]); |
1825 | bh = head; | |
1826 | do { | |
1827 | err = btrfs_map_bh_to_logical(root, bh, | |
1828 | alloc_extent_start); | |
1829 | BUG_ON(err); | |
1830 | if (err) | |
1831 | goto failed_truncate; | |
1832 | bh = bh->b_this_page; | |
236454df CM |
1833 | if (alloc_extent_start) |
1834 | alloc_extent_start++; | |
6567e837 | 1835 | } while (bh != head); |
75dfe396 | 1836 | pos += this_write; |
75dfe396 CM |
1837 | WARN_ON(this_write > write_bytes); |
1838 | write_bytes -= this_write; | |
1839 | } | |
1840 | return 0; | |
1841 | ||
1842 | failed_release: | |
1843 | btrfs_drop_pages(pages, num_pages); | |
1844 | return err; | |
1845 | ||
1846 | failed_truncate: | |
1847 | btrfs_drop_pages(pages, num_pages); | |
1848 | if (pos > isize) | |
1849 | vmtruncate(inode, isize); | |
1850 | return err; | |
1851 | } | |
1852 | ||
1853 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1854 | size_t count, loff_t *ppos) | |
1855 | { | |
1856 | loff_t pos; | |
1857 | size_t num_written = 0; | |
1858 | int err = 0; | |
1859 | int ret = 0; | |
75dfe396 | 1860 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1861 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1862 | struct page *pages[8]; |
35b7e476 | 1863 | struct page *pinned[2]; |
2932f3ec CM |
1864 | unsigned long first_index; |
1865 | unsigned long last_index; | |
6567e837 CM |
1866 | u64 start_pos; |
1867 | u64 num_blocks; | |
1868 | u64 alloc_extent_start; | |
de428b63 | 1869 | u64 hint_block; |
6567e837 | 1870 | struct btrfs_trans_handle *trans; |
b18c6685 | 1871 | struct btrfs_key ins; |
35b7e476 CM |
1872 | pinned[0] = NULL; |
1873 | pinned[1] = NULL; | |
75dfe396 CM |
1874 | if (file->f_flags & O_DIRECT) |
1875 | return -EINVAL; | |
1876 | pos = *ppos; | |
75dfe396 CM |
1877 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1878 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1879 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1880 | if (err) | |
1881 | goto out; | |
1882 | if (count == 0) | |
1883 | goto out; | |
1884 | err = remove_suid(file->f_path.dentry); | |
1885 | if (err) | |
1886 | goto out; | |
1887 | file_update_time(file); | |
a429e513 CM |
1888 | |
1889 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1890 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1891 | inode->i_blkbits; | |
1892 | ||
75dfe396 | 1893 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
1894 | first_index = pos >> PAGE_CACHE_SHIFT; |
1895 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 1896 | |
a429e513 CM |
1897 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
1898 | (pos & (PAGE_CACHE_SIZE - 1))) { | |
1899 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
1900 | if (!PageUptodate(pinned[0])) { | |
1901 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
1902 | BUG_ON(ret); | |
35b7e476 | 1903 | wait_on_page_locked(pinned[0]); |
a429e513 CM |
1904 | } else { |
1905 | unlock_page(pinned[0]); | |
1906 | } | |
1907 | } | |
1908 | if (first_index != last_index && | |
1909 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && | |
de428b63 | 1910 | pos + count < inode->i_size && |
a429e513 CM |
1911 | (count & (PAGE_CACHE_SIZE - 1))) { |
1912 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
1913 | if (!PageUptodate(pinned[1])) { | |
1914 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
1915 | BUG_ON(ret); | |
35b7e476 | 1916 | wait_on_page_locked(pinned[1]); |
a429e513 CM |
1917 | } else { |
1918 | unlock_page(pinned[1]); | |
1919 | } | |
1920 | } | |
1921 | ||
6567e837 CM |
1922 | mutex_lock(&root->fs_info->fs_mutex); |
1923 | trans = btrfs_start_transaction(root, 1); | |
1924 | if (!trans) { | |
1925 | err = -ENOMEM; | |
b18c6685 | 1926 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
1927 | goto out_unlock; |
1928 | } | |
31f3c99b | 1929 | btrfs_set_trans_block_group(trans, inode); |
a429e513 CM |
1930 | /* FIXME blocksize != 4096 */ |
1931 | inode->i_blocks += num_blocks << 3; | |
de428b63 | 1932 | hint_block = 0; |
b18c6685 | 1933 | if (start_pos < inode->i_size) { |
a429e513 | 1934 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
1935 | ret = drop_extents(trans, root, inode, |
1936 | start_pos, | |
1937 | (pos + count + root->blocksize -1) & | |
de428b63 | 1938 | ~((u64)root->blocksize - 1), &hint_block); |
236454df | 1939 | BUG_ON(ret); |
b18c6685 | 1940 | } |
236454df CM |
1941 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
1942 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 1943 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
de428b63 CM |
1944 | num_blocks, hint_block, (u64)-1, |
1945 | &ins, 1); | |
236454df CM |
1946 | BUG_ON(ret); |
1947 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
b18c6685 | 1948 | start_pos, ins.objectid, ins.offset); |
236454df CM |
1949 | BUG_ON(ret); |
1950 | } else { | |
1951 | ins.offset = 0; | |
1952 | ins.objectid = 0; | |
1953 | } | |
6567e837 | 1954 | BUG_ON(ret); |
b18c6685 | 1955 | alloc_extent_start = ins.objectid; |
e37c9e69 | 1956 | // btrfs_update_inode_block_group(trans, inode); |
b18c6685 | 1957 | ret = btrfs_end_transaction(trans, root); |
6567e837 CM |
1958 | mutex_unlock(&root->fs_info->fs_mutex); |
1959 | ||
75dfe396 CM |
1960 | while(count > 0) { |
1961 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1962 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1963 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1964 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
1965 | |
1966 | memset(pages, 0, sizeof(pages)); | |
1967 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
1968 | pos, first_index, last_index, |
1969 | write_bytes, alloc_extent_start); | |
75dfe396 | 1970 | BUG_ON(ret); |
b18c6685 | 1971 | |
6567e837 | 1972 | /* FIXME blocks != pagesize */ |
236454df CM |
1973 | if (alloc_extent_start) |
1974 | alloc_extent_start += num_pages; | |
75dfe396 CM |
1975 | ret = btrfs_copy_from_user(pos, num_pages, |
1976 | write_bytes, pages, buf); | |
1977 | BUG_ON(ret); | |
1978 | ||
f254e52c | 1979 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 1980 | num_pages, pos, write_bytes); |
75dfe396 CM |
1981 | BUG_ON(ret); |
1982 | btrfs_drop_pages(pages, num_pages); | |
1983 | ||
75dfe396 CM |
1984 | buf += write_bytes; |
1985 | count -= write_bytes; | |
1986 | pos += write_bytes; | |
1987 | num_written += write_bytes; | |
1988 | ||
1989 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
35b7e476 | 1990 | btrfs_btree_balance_dirty(root); |
75dfe396 CM |
1991 | cond_resched(); |
1992 | } | |
6567e837 | 1993 | out_unlock: |
75dfe396 CM |
1994 | mutex_unlock(&inode->i_mutex); |
1995 | out: | |
a429e513 CM |
1996 | if (pinned[0]) |
1997 | page_cache_release(pinned[0]); | |
1998 | if (pinned[1]) | |
1999 | page_cache_release(pinned[1]); | |
75dfe396 CM |
2000 | *ppos = pos; |
2001 | current->backing_dev_info = NULL; | |
a429e513 | 2002 | mark_inode_dirty(inode); |
75dfe396 CM |
2003 | return num_written ? num_written : err; |
2004 | } | |
2005 | ||
f254e52c CM |
2006 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
2007 | unsigned long offset, unsigned long size) | |
2008 | { | |
2009 | char *kaddr; | |
2010 | unsigned long left, count = desc->count; | |
d6e4a428 | 2011 | struct inode *inode = page->mapping->host; |
f254e52c CM |
2012 | |
2013 | if (size > count) | |
2014 | size = count; | |
2015 | ||
2016 | if (!PageChecked(page)) { | |
2017 | /* FIXME, do it per block */ | |
d6e4a428 | 2018 | struct btrfs_root *root = BTRFS_I(inode)->root; |
236454df | 2019 | |
f254e52c | 2020 | int ret = btrfs_csum_verify_file_block(root, |
236454df CM |
2021 | page->mapping->host->i_ino, |
2022 | page->index << PAGE_CACHE_SHIFT, | |
2023 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c CM |
2024 | if (ret) { |
2025 | printk("failed to verify ino %lu page %lu\n", | |
2026 | page->mapping->host->i_ino, | |
2027 | page->index); | |
2028 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
2029 | } | |
2030 | SetPageChecked(page); | |
2031 | kunmap(page); | |
2032 | } | |
2033 | /* | |
2034 | * Faults on the destination of a read are common, so do it before | |
2035 | * taking the kmap. | |
2036 | */ | |
2037 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
2038 | kaddr = kmap_atomic(page, KM_USER0); | |
2039 | left = __copy_to_user_inatomic(desc->arg.buf, | |
2040 | kaddr + offset, size); | |
2041 | kunmap_atomic(kaddr, KM_USER0); | |
2042 | if (left == 0) | |
2043 | goto success; | |
2044 | } | |
2045 | ||
2046 | /* Do it the slow way */ | |
2047 | kaddr = kmap(page); | |
2048 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
2049 | kunmap(page); | |
2050 | ||
2051 | if (left) { | |
2052 | size -= left; | |
2053 | desc->error = -EFAULT; | |
2054 | } | |
2055 | success: | |
2056 | desc->count = count - size; | |
2057 | desc->written += size; | |
2058 | desc->arg.buf += size; | |
2059 | return size; | |
2060 | } | |
2061 | ||
2062 | /** | |
2063 | * btrfs_file_aio_read - filesystem read routine | |
2064 | * @iocb: kernel I/O control block | |
2065 | * @iov: io vector request | |
2066 | * @nr_segs: number of segments in the iovec | |
2067 | * @pos: current file position | |
2068 | */ | |
2069 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
2070 | unsigned long nr_segs, loff_t pos) | |
2071 | { | |
2072 | struct file *filp = iocb->ki_filp; | |
2073 | ssize_t retval; | |
2074 | unsigned long seg; | |
2075 | size_t count; | |
2076 | loff_t *ppos = &iocb->ki_pos; | |
2077 | ||
2078 | count = 0; | |
2079 | for (seg = 0; seg < nr_segs; seg++) { | |
2080 | const struct iovec *iv = &iov[seg]; | |
2081 | ||
2082 | /* | |
2083 | * If any segment has a negative length, or the cumulative | |
2084 | * length ever wraps negative then return -EINVAL. | |
2085 | */ | |
2086 | count += iv->iov_len; | |
2087 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
2088 | return -EINVAL; | |
2089 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
2090 | continue; | |
2091 | if (seg == 0) | |
2092 | return -EFAULT; | |
2093 | nr_segs = seg; | |
2094 | count -= iv->iov_len; /* This segment is no good */ | |
2095 | break; | |
2096 | } | |
2097 | retval = 0; | |
2098 | if (count) { | |
2099 | for (seg = 0; seg < nr_segs; seg++) { | |
2100 | read_descriptor_t desc; | |
2101 | ||
2102 | desc.written = 0; | |
2103 | desc.arg.buf = iov[seg].iov_base; | |
2104 | desc.count = iov[seg].iov_len; | |
2105 | if (desc.count == 0) | |
2106 | continue; | |
2107 | desc.error = 0; | |
2108 | do_generic_file_read(filp, ppos, &desc, | |
2109 | btrfs_read_actor); | |
2110 | retval += desc.written; | |
2111 | if (desc.error) { | |
2112 | retval = retval ?: desc.error; | |
2113 | break; | |
2114 | } | |
2115 | } | |
2116 | } | |
2117 | return retval; | |
2118 | } | |
2119 | ||
2619ba1f CM |
2120 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2121 | { | |
2122 | struct btrfs_trans_handle *trans; | |
2123 | struct btrfs_key key; | |
2124 | struct btrfs_root_item root_item; | |
2125 | struct btrfs_inode_item *inode_item; | |
2126 | struct buffer_head *subvol; | |
2127 | struct btrfs_leaf *leaf; | |
2128 | struct btrfs_root *new_root; | |
2129 | struct inode *inode; | |
31f3c99b | 2130 | struct inode *dir; |
2619ba1f CM |
2131 | int ret; |
2132 | u64 objectid; | |
2133 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2134 | ||
2135 | mutex_lock(&root->fs_info->fs_mutex); | |
2136 | trans = btrfs_start_transaction(root, 1); | |
2137 | BUG_ON(!trans); | |
2138 | ||
31f3c99b | 2139 | subvol = btrfs_alloc_free_block(trans, root, 0); |
5e82849e CM |
2140 | if (subvol == NULL) |
2141 | return -ENOSPC; | |
2619ba1f CM |
2142 | leaf = btrfs_buffer_leaf(subvol); |
2143 | btrfs_set_header_nritems(&leaf->header, 0); | |
2144 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2145 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2146 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2147 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2148 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2149 | sizeof(leaf->header.fsid)); | |
4d775673 | 2150 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2151 | |
2152 | inode_item = &root_item.inode; | |
2153 | memset(inode_item, 0, sizeof(*inode_item)); | |
2154 | btrfs_set_inode_generation(inode_item, 1); | |
2155 | btrfs_set_inode_size(inode_item, 3); | |
2156 | btrfs_set_inode_nlink(inode_item, 1); | |
2157 | btrfs_set_inode_nblocks(inode_item, 1); | |
2158 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2159 | ||
7eccb903 | 2160 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2161 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2162 | brelse(subvol); |
2163 | subvol = NULL; | |
2619ba1f | 2164 | |
2619ba1f CM |
2165 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2166 | 0, &objectid); | |
2167 | BUG_ON(ret); | |
2168 | ||
2169 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2170 | ||
2171 | key.objectid = objectid; | |
2172 | key.offset = 1; | |
2173 | key.flags = 0; | |
2174 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2175 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2176 | &root_item); | |
2177 | BUG_ON(ret); | |
2178 | ||
2179 | /* | |
2180 | * insert the directory item | |
2181 | */ | |
2182 | key.offset = (u64)-1; | |
31f3c99b | 2183 | dir = root->fs_info->sb->s_root->d_inode; |
2619ba1f | 2184 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
31f3c99b | 2185 | name, namelen, dir->i_ino, &key, 0); |
2619ba1f CM |
2186 | BUG_ON(ret); |
2187 | ||
2188 | ret = btrfs_commit_transaction(trans, root); | |
2189 | BUG_ON(ret); | |
2190 | ||
2191 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2192 | BUG_ON(!new_root); | |
2193 | ||
2194 | trans = btrfs_start_transaction(new_root, 1); | |
2195 | BUG_ON(!trans); | |
2196 | ||
31f3c99b CM |
2197 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
2198 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
2619ba1f CM |
2199 | inode->i_op = &btrfs_dir_inode_operations; |
2200 | inode->i_fop = &btrfs_dir_file_operations; | |
2201 | ||
2202 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2203 | BUG_ON(ret); | |
2204 | ||
2205 | inode->i_nlink = 1; | |
2206 | inode->i_size = 6; | |
2207 | ret = btrfs_update_inode(trans, new_root, inode); | |
2208 | BUG_ON(ret); | |
2209 | ||
2210 | ret = btrfs_commit_transaction(trans, new_root); | |
2211 | BUG_ON(ret); | |
2212 | ||
2213 | iput(inode); | |
2214 | ||
2215 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2216 | btrfs_btree_balance_dirty(root); |
2619ba1f CM |
2217 | return 0; |
2218 | } | |
2219 | ||
c5739bba CM |
2220 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2221 | { | |
2222 | struct btrfs_trans_handle *trans; | |
2223 | struct btrfs_key key; | |
2224 | struct btrfs_root_item new_root_item; | |
2225 | int ret; | |
2226 | u64 objectid; | |
2227 | ||
2619ba1f CM |
2228 | if (!root->ref_cows) |
2229 | return -EINVAL; | |
2230 | ||
c5739bba CM |
2231 | mutex_lock(&root->fs_info->fs_mutex); |
2232 | trans = btrfs_start_transaction(root, 1); | |
2233 | BUG_ON(!trans); | |
2234 | ||
2235 | ret = btrfs_update_inode(trans, root, root->inode); | |
2236 | BUG_ON(ret); | |
2237 | ||
1b05da2e CM |
2238 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2239 | 0, &objectid); | |
c5739bba CM |
2240 | BUG_ON(ret); |
2241 | ||
c5739bba CM |
2242 | memcpy(&new_root_item, &root->root_item, |
2243 | sizeof(new_root_item)); | |
2244 | ||
c5739bba CM |
2245 | key.objectid = objectid; |
2246 | key.offset = 1; | |
2247 | key.flags = 0; | |
2248 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2249 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2250 | |
2251 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2252 | &new_root_item); | |
2253 | BUG_ON(ret); | |
2254 | ||
c5739bba CM |
2255 | /* |
2256 | * insert the directory item | |
2257 | */ | |
2258 | key.offset = (u64)-1; | |
2259 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2260 | name, namelen, | |
2261 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2262 | &key, 0); | |
2263 | ||
2264 | BUG_ON(ret); | |
2265 | ||
2266 | ret = btrfs_inc_root_ref(trans, root); | |
2267 | BUG_ON(ret); | |
2268 | ||
2269 | ret = btrfs_commit_transaction(trans, root); | |
2270 | BUG_ON(ret); | |
2271 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2272 | btrfs_btree_balance_dirty(root); |
c5739bba CM |
2273 | return 0; |
2274 | } | |
2275 | ||
8352d8a4 CM |
2276 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2277 | { | |
2278 | struct block_device *bdev; | |
2279 | struct btrfs_path *path; | |
2280 | struct super_block *sb = root->fs_info->sb; | |
2281 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2282 | struct btrfs_trans_handle *trans; | |
2283 | struct btrfs_device_item *dev_item; | |
2284 | struct btrfs_key key; | |
2285 | u16 item_size; | |
2286 | u64 num_blocks; | |
2287 | u64 new_blocks; | |
b4100d64 | 2288 | u64 device_id; |
8352d8a4 | 2289 | int ret; |
b4100d64 | 2290 | |
8352d8a4 CM |
2291 | printk("adding disk %s\n", name); |
2292 | path = btrfs_alloc_path(); | |
2293 | if (!path) | |
2294 | return -ENOMEM; | |
2295 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2296 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2297 | if (IS_ERR(bdev)) { | |
2298 | ret = PTR_ERR(bdev); | |
2299 | printk("open bdev excl failed ret %d\n", ret); | |
2300 | goto out_nolock; | |
2301 | } | |
2302 | set_blocksize(bdev, sb->s_blocksize); | |
2303 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2304 | key.objectid = num_blocks; | |
2305 | key.offset = new_blocks; | |
2306 | key.flags = 0; | |
2307 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2308 | ||
2309 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2310 | trans = btrfs_start_transaction(dev_root, 1); | |
2311 | item_size = sizeof(*dev_item) + namelen; | |
2312 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2313 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2314 | if (ret) { | |
2315 | printk("insert failed %d\n", ret); | |
2316 | close_bdev_excl(bdev); | |
2317 | if (ret > 0) | |
2318 | ret = -EEXIST; | |
2319 | goto out; | |
2320 | } | |
2321 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2322 | path->slots[0], struct btrfs_device_item); | |
2323 | btrfs_set_device_pathlen(dev_item, namelen); | |
2324 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2325 | |
2326 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2327 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2328 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2329 | mark_buffer_dirty(path->nodes[0]); |
2330 | ||
b4100d64 CM |
2331 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2332 | new_blocks); | |
8352d8a4 CM |
2333 | |
2334 | if (!ret) { | |
2335 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2336 | num_blocks + new_blocks); | |
2337 | i_size_write(root->fs_info->btree_inode, | |
2338 | (num_blocks + new_blocks) << | |
2339 | root->fs_info->btree_inode->i_blkbits); | |
2340 | } | |
2341 | ||
2342 | out: | |
2343 | ret = btrfs_commit_transaction(trans, dev_root); | |
2344 | BUG_ON(ret); | |
2345 | mutex_unlock(&root->fs_info->fs_mutex); | |
2346 | out_nolock: | |
2347 | btrfs_free_path(path); | |
35b7e476 | 2348 | btrfs_btree_balance_dirty(root); |
8352d8a4 CM |
2349 | |
2350 | return ret; | |
2351 | } | |
2352 | ||
c5739bba CM |
2353 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2354 | cmd, unsigned long arg) | |
2355 | { | |
2356 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2357 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2358 | int ret = 0; |
7e38180e | 2359 | struct btrfs_dir_item *di; |
c5739bba | 2360 | int namelen; |
2619ba1f CM |
2361 | struct btrfs_path *path; |
2362 | u64 root_dirid; | |
c5739bba | 2363 | |
c5739bba CM |
2364 | switch (cmd) { |
2365 | case BTRFS_IOC_SNAP_CREATE: | |
2366 | if (copy_from_user(&vol_args, | |
2367 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2368 | sizeof(vol_args))) | |
2369 | return -EFAULT; | |
2370 | namelen = strlen(vol_args.name); | |
2371 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2372 | return -EINVAL; | |
2619ba1f CM |
2373 | path = btrfs_alloc_path(); |
2374 | if (!path) | |
2375 | return -ENOMEM; | |
2d13d8d0 | 2376 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2377 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2378 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2379 | path, root_dirid, |
2380 | vol_args.name, namelen, 0); | |
2381 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2382 | btrfs_free_path(path); |
7e38180e | 2383 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2384 | return -EEXIST; |
2385 | ||
2386 | if (root == root->fs_info->tree_root) | |
2387 | ret = create_subvol(root, vol_args.name, namelen); | |
2388 | else | |
2389 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2390 | WARN_ON(ret); |
2391 | break; | |
8352d8a4 CM |
2392 | case BTRFS_IOC_ADD_DISK: |
2393 | if (copy_from_user(&vol_args, | |
2394 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2395 | sizeof(vol_args))) | |
2396 | return -EFAULT; | |
2397 | namelen = strlen(vol_args.name); | |
2398 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2399 | return -EINVAL; | |
2400 | vol_args.name[namelen] = '\0'; | |
2401 | ret = add_disk(root, vol_args.name, namelen); | |
2402 | break; | |
c5739bba CM |
2403 | default: |
2404 | return -ENOTTY; | |
2405 | } | |
8352d8a4 | 2406 | return ret; |
c5739bba CM |
2407 | } |
2408 | ||
2c90e5d6 CM |
2409 | static struct kmem_cache *btrfs_inode_cachep; |
2410 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2411 | struct kmem_cache *btrfs_transaction_cachep; | |
2412 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2413 | struct kmem_cache *btrfs_path_cachep; | |
2414 | ||
2415 | /* | |
2416 | * Called inside transaction, so use GFP_NOFS | |
2417 | */ | |
2418 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2419 | { | |
2420 | struct btrfs_inode *ei; | |
2421 | ||
2422 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2423 | if (!ei) | |
2424 | return NULL; | |
2c90e5d6 CM |
2425 | return &ei->vfs_inode; |
2426 | } | |
2427 | ||
2428 | static void btrfs_destroy_inode(struct inode *inode) | |
2429 | { | |
2c90e5d6 | 2430 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2431 | WARN_ON(inode->i_data.nrpages); |
2432 | ||
2c90e5d6 CM |
2433 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2434 | } | |
2435 | ||
2436 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2437 | unsigned long flags) | |
2438 | { | |
2439 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2440 | ||
2441 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
2442 | SLAB_CTOR_CONSTRUCTOR) { | |
2443 | inode_init_once(&ei->vfs_inode); | |
2444 | } | |
2445 | } | |
2446 | ||
2447 | static int init_inodecache(void) | |
2448 | { | |
2449 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2450 | sizeof(struct btrfs_inode), | |
2451 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2452 | SLAB_MEM_SPREAD), | |
2453 | init_once, NULL); | |
2454 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2455 | sizeof(struct btrfs_trans_handle), | |
2456 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2457 | SLAB_MEM_SPREAD), | |
2458 | NULL, NULL); | |
2459 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2460 | sizeof(struct btrfs_transaction), | |
2461 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2462 | SLAB_MEM_SPREAD), | |
2463 | NULL, NULL); | |
2464 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2465 | sizeof(struct btrfs_transaction), | |
2466 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2467 | SLAB_MEM_SPREAD), | |
2468 | NULL, NULL); | |
2469 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2470 | 256, | |
2471 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2472 | SLAB_MEM_SPREAD | | |
2473 | SLAB_DESTROY_BY_RCU), | |
2474 | NULL, NULL); | |
2475 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2476 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2477 | return -ENOMEM; | |
2478 | return 0; | |
2479 | } | |
2480 | ||
2481 | static void destroy_inodecache(void) | |
2482 | { | |
2483 | kmem_cache_destroy(btrfs_inode_cachep); | |
2484 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2485 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2486 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2487 | kmem_cache_destroy(btrfs_path_cachep); | |
2488 | } | |
2489 | ||
2e635a27 CM |
2490 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2491 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2492 | { | |
2493 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2494 | btrfs_fill_super, mnt); | |
2495 | } | |
2496 | ||
236454df CM |
2497 | static int btrfs_getattr(struct vfsmount *mnt, |
2498 | struct dentry *dentry, struct kstat *stat) | |
2499 | { | |
2500 | struct inode *inode = dentry->d_inode; | |
2501 | generic_fillattr(inode, stat); | |
2502 | stat->blksize = 256 * 1024; | |
2503 | return 0; | |
2504 | } | |
2505 | ||
8fd17795 CM |
2506 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2507 | { | |
2508 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2509 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2510 | ||
2511 | buf->f_namelen = BTRFS_NAME_LEN; | |
2512 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2513 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2514 | buf->f_bavail = buf->f_bfree; | |
2515 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2516 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2517 | return 0; | |
2518 | } | |
b5133862 | 2519 | |
2e635a27 CM |
2520 | static struct file_system_type btrfs_fs_type = { |
2521 | .owner = THIS_MODULE, | |
2522 | .name = "btrfs", | |
2523 | .get_sb = btrfs_get_sb, | |
2524 | .kill_sb = kill_block_super, | |
2525 | .fs_flags = FS_REQUIRES_DEV, | |
2526 | }; | |
2527 | ||
e20d96d6 | 2528 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2529 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2530 | .put_super = btrfs_put_super, |
2531 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2532 | .write_super = btrfs_write_super, |
2533 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2534 | .write_inode = btrfs_write_inode, |
b5133862 | 2535 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
2536 | .alloc_inode = btrfs_alloc_inode, |
2537 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2538 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2539 | }; |
2540 | ||
2541 | static struct inode_operations btrfs_dir_inode_operations = { | |
2542 | .lookup = btrfs_lookup, | |
d5719762 | 2543 | .create = btrfs_create, |
134e9731 | 2544 | .unlink = btrfs_unlink, |
f7922033 | 2545 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2546 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
2547 | }; |
2548 | ||
d6e4a428 CM |
2549 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2550 | .lookup = btrfs_lookup, | |
2551 | }; | |
2552 | ||
e20d96d6 CM |
2553 | static struct file_operations btrfs_dir_file_operations = { |
2554 | .llseek = generic_file_llseek, | |
2555 | .read = generic_read_dir, | |
2556 | .readdir = btrfs_readdir, | |
c5739bba | 2557 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2558 | }; |
2559 | ||
dee26a9f CM |
2560 | static struct address_space_operations btrfs_aops = { |
2561 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2562 | .writepage = btrfs_writepage, |
2563 | .sync_page = block_sync_page, | |
2564 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2565 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2566 | }; |
2567 | ||
2568 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 2569 | .truncate = btrfs_truncate, |
236454df | 2570 | .getattr = btrfs_getattr, |
dee26a9f CM |
2571 | }; |
2572 | ||
2573 | static struct file_operations btrfs_file_operations = { | |
2574 | .llseek = generic_file_llseek, | |
2575 | .read = do_sync_read, | |
e8f05c45 CM |
2576 | .aio_read = btrfs_file_aio_read, |
2577 | .write = btrfs_file_write, | |
dee26a9f CM |
2578 | .mmap = generic_file_mmap, |
2579 | .open = generic_file_open, | |
c5739bba | 2580 | .ioctl = btrfs_ioctl, |
8fd17795 | 2581 | .fsync = btrfs_sync_file, |
dee26a9f | 2582 | }; |
e20d96d6 | 2583 | |
2e635a27 CM |
2584 | static int __init init_btrfs_fs(void) |
2585 | { | |
2c90e5d6 | 2586 | int err; |
2e635a27 | 2587 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2588 | err = init_inodecache(); |
2589 | if (err) | |
2590 | return err; | |
d6e4a428 CM |
2591 | kset_set_kset_s(&btrfs_subsys, fs_subsys); |
2592 | err = subsystem_register(&btrfs_subsys); | |
2593 | if (err) | |
2594 | goto out; | |
2e635a27 | 2595 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2596 | out: |
2597 | destroy_inodecache(); | |
2598 | return err; | |
2e635a27 CM |
2599 | } |
2600 | ||
2601 | static void __exit exit_btrfs_fs(void) | |
2602 | { | |
2c90e5d6 | 2603 | destroy_inodecache(); |
2e635a27 | 2604 | unregister_filesystem(&btrfs_fs_type); |
d6e4a428 | 2605 | subsystem_unregister(&btrfs_subsys); |
2e635a27 CM |
2606 | printk("btrfs unloaded\n"); |
2607 | } | |
2608 | ||
2609 | module_init(init_btrfs_fs) | |
2610 | module_exit(exit_btrfs_fs) | |
2611 | ||
2612 | MODULE_LICENSE("GPL"); |