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 | |
c5739bba CM |
21 | struct btrfs_iget_args { |
22 | u64 ino; | |
23 | struct btrfs_root *root; | |
24 | }; | |
25 | ||
2e635a27 | 26 | #define BTRFS_SUPER_MAGIC 0x9123682E |
e20d96d6 CM |
27 | |
28 | static struct inode_operations btrfs_dir_inode_operations; | |
d6e4a428 | 29 | static struct inode_operations btrfs_dir_ro_inode_operations; |
e20d96d6 CM |
30 | static struct super_operations btrfs_super_ops; |
31 | static struct file_operations btrfs_dir_file_operations; | |
dee26a9f CM |
32 | static struct inode_operations btrfs_file_inode_operations; |
33 | static struct address_space_operations btrfs_aops; | |
34 | static struct file_operations btrfs_file_operations; | |
e20d96d6 | 35 | |
e20d96d6 | 36 | static void btrfs_read_locked_inode(struct inode *inode) |
2e635a27 | 37 | { |
5caf2a00 | 38 | struct btrfs_path *path; |
e20d96d6 | 39 | struct btrfs_inode_item *inode_item; |
d6e4a428 CM |
40 | struct btrfs_root *root = BTRFS_I(inode)->root; |
41 | struct btrfs_key location; | |
31f3c99b CM |
42 | struct btrfs_block_group_cache *alloc_group; |
43 | u64 alloc_group_block; | |
e20d96d6 | 44 | int ret; |
f4b9aa8d | 45 | |
5caf2a00 CM |
46 | path = btrfs_alloc_path(); |
47 | BUG_ON(!path); | |
48 | btrfs_init_path(path); | |
f4b9aa8d CM |
49 | mutex_lock(&root->fs_info->fs_mutex); |
50 | ||
d6e4a428 CM |
51 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
52 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
e20d96d6 | 53 | if (ret) { |
7cfcc17e | 54 | btrfs_free_path(path); |
d6e4a428 | 55 | goto make_bad; |
e20d96d6 | 56 | } |
5caf2a00 CM |
57 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
58 | path->slots[0], | |
e20d96d6 | 59 | struct btrfs_inode_item); |
2e635a27 | 60 | |
e20d96d6 CM |
61 | inode->i_mode = btrfs_inode_mode(inode_item); |
62 | inode->i_nlink = btrfs_inode_nlink(inode_item); | |
63 | inode->i_uid = btrfs_inode_uid(inode_item); | |
64 | inode->i_gid = btrfs_inode_gid(inode_item); | |
65 | inode->i_size = btrfs_inode_size(inode_item); | |
66 | inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime); | |
67 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime); | |
68 | inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime); | |
69 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime); | |
70 | inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime); | |
71 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime); | |
72 | inode->i_blocks = btrfs_inode_nblocks(inode_item); | |
73 | inode->i_generation = btrfs_inode_generation(inode_item); | |
31f3c99b CM |
74 | alloc_group_block = btrfs_inode_block_group(inode_item); |
75 | ret = radix_tree_gang_lookup(&root->fs_info->block_group_radix, | |
76 | (void **)&alloc_group, | |
77 | alloc_group_block, 1); | |
78 | BUG_ON(!ret); | |
79 | BTRFS_I(inode)->block_group = alloc_group; | |
5caf2a00 | 80 | |
5caf2a00 CM |
81 | btrfs_free_path(path); |
82 | inode_item = NULL; | |
83 | ||
f4b9aa8d | 84 | mutex_unlock(&root->fs_info->fs_mutex); |
1b05da2e | 85 | |
e20d96d6 CM |
86 | switch (inode->i_mode & S_IFMT) { |
87 | #if 0 | |
88 | default: | |
89 | init_special_inode(inode, inode->i_mode, | |
90 | btrfs_inode_rdev(inode_item)); | |
91 | break; | |
92 | #endif | |
93 | case S_IFREG: | |
dee26a9f CM |
94 | inode->i_mapping->a_ops = &btrfs_aops; |
95 | inode->i_fop = &btrfs_file_operations; | |
96 | inode->i_op = &btrfs_file_inode_operations; | |
e20d96d6 CM |
97 | break; |
98 | case S_IFDIR: | |
e20d96d6 | 99 | inode->i_fop = &btrfs_dir_file_operations; |
d6e4a428 CM |
100 | if (root == root->fs_info->tree_root) |
101 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
102 | else | |
103 | inode->i_op = &btrfs_dir_inode_operations; | |
e20d96d6 CM |
104 | break; |
105 | case S_IFLNK: | |
e20d96d6 CM |
106 | // inode->i_op = &page_symlink_inode_operations; |
107 | break; | |
2e635a27 | 108 | } |
e20d96d6 | 109 | return; |
d6e4a428 CM |
110 | |
111 | make_bad: | |
112 | btrfs_release_path(root, path); | |
113 | btrfs_free_path(path); | |
114 | mutex_unlock(&root->fs_info->fs_mutex); | |
115 | make_bad_inode(inode); | |
2e635a27 CM |
116 | } |
117 | ||
f68cad0f CM |
118 | static void fill_inode_item(struct btrfs_inode_item *item, |
119 | struct inode *inode) | |
120 | { | |
121 | btrfs_set_inode_uid(item, inode->i_uid); | |
122 | btrfs_set_inode_gid(item, inode->i_gid); | |
123 | btrfs_set_inode_size(item, inode->i_size); | |
124 | btrfs_set_inode_mode(item, inode->i_mode); | |
125 | btrfs_set_inode_nlink(item, inode->i_nlink); | |
126 | btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec); | |
127 | btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec); | |
128 | btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec); | |
129 | btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec); | |
130 | btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec); | |
131 | btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec); | |
132 | btrfs_set_inode_nblocks(item, inode->i_blocks); | |
133 | btrfs_set_inode_generation(item, inode->i_generation); | |
31f3c99b CM |
134 | btrfs_set_inode_block_group(item, |
135 | BTRFS_I(inode)->block_group->key.objectid); | |
f68cad0f CM |
136 | } |
137 | ||
f68cad0f CM |
138 | static int btrfs_update_inode(struct btrfs_trans_handle *trans, |
139 | struct btrfs_root *root, | |
140 | struct inode *inode) | |
141 | { | |
142 | struct btrfs_inode_item *inode_item; | |
143 | struct btrfs_path *path; | |
144 | int ret; | |
145 | ||
146 | path = btrfs_alloc_path(); | |
147 | BUG_ON(!path); | |
148 | btrfs_init_path(path); | |
149 | ret = btrfs_lookup_inode(trans, root, path, | |
150 | &BTRFS_I(inode)->location, 1); | |
151 | if (ret) { | |
152 | if (ret > 0) | |
153 | ret = -ENOENT; | |
154 | goto failed; | |
155 | } | |
156 | ||
157 | inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
158 | path->slots[0], | |
159 | struct btrfs_inode_item); | |
160 | ||
161 | fill_inode_item(inode_item, inode); | |
162 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
163 | ret = 0; | |
164 | failed: | |
165 | btrfs_release_path(root, path); | |
166 | btrfs_free_path(path); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | ||
5f443fd2 CM |
171 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, |
172 | struct btrfs_root *root, | |
173 | struct inode *dir, | |
174 | struct dentry *dentry) | |
134e9731 | 175 | { |
5caf2a00 | 176 | struct btrfs_path *path; |
134e9731 CM |
177 | const char *name = dentry->d_name.name; |
178 | int name_len = dentry->d_name.len; | |
7e38180e | 179 | int ret = 0; |
134e9731 CM |
180 | u64 objectid; |
181 | struct btrfs_dir_item *di; | |
182 | ||
5caf2a00 CM |
183 | path = btrfs_alloc_path(); |
184 | BUG_ON(!path); | |
185 | btrfs_init_path(path); | |
7e38180e | 186 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
134e9731 | 187 | name, name_len, -1); |
7e38180e CM |
188 | if (IS_ERR(di)) { |
189 | ret = PTR_ERR(di); | |
134e9731 | 190 | goto err; |
7e38180e CM |
191 | } |
192 | if (!di) { | |
134e9731 CM |
193 | ret = -ENOENT; |
194 | goto err; | |
195 | } | |
d6e4a428 | 196 | objectid = btrfs_disk_key_objectid(&di->location); |
7e38180e CM |
197 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
198 | BUG_ON(ret); | |
199 | btrfs_release_path(root, path); | |
134e9731 | 200 | |
7e38180e CM |
201 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
202 | objectid, name, name_len, -1); | |
203 | if (IS_ERR(di)) { | |
204 | ret = PTR_ERR(di); | |
205 | goto err; | |
206 | } | |
207 | if (!di) { | |
208 | ret = -ENOENT; | |
209 | goto err; | |
210 | } | |
211 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
5f26f772 CM |
212 | BUG_ON(ret); |
213 | ||
134e9731 CM |
214 | dentry->d_inode->i_ctime = dir->i_ctime; |
215 | err: | |
5caf2a00 | 216 | btrfs_free_path(path); |
f68cad0f | 217 | if (!ret) { |
5f26f772 | 218 | dir->i_size -= name_len * 2; |
f68cad0f CM |
219 | btrfs_update_inode(trans, root, dir); |
220 | drop_nlink(dentry->d_inode); | |
221 | btrfs_update_inode(trans, root, dentry->d_inode); | |
cd1bc465 | 222 | dir->i_sb->s_dirt = 1; |
d4dbff95 | 223 | } |
134e9731 CM |
224 | return ret; |
225 | } | |
226 | ||
5f443fd2 CM |
227 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
228 | { | |
229 | struct btrfs_root *root; | |
230 | struct btrfs_trans_handle *trans; | |
231 | int ret; | |
232 | ||
d6e4a428 | 233 | root = BTRFS_I(dir)->root; |
5f443fd2 CM |
234 | mutex_lock(&root->fs_info->fs_mutex); |
235 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 236 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
237 | ret = btrfs_unlink_trans(trans, root, dir, dentry); |
238 | btrfs_end_transaction(trans, root); | |
239 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 240 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
241 | return ret; |
242 | } | |
243 | ||
244 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
245 | { | |
246 | struct inode *inode = dentry->d_inode; | |
247 | int err; | |
248 | int ret; | |
d6e4a428 | 249 | struct btrfs_root *root = BTRFS_I(dir)->root; |
5caf2a00 | 250 | struct btrfs_path *path; |
5f443fd2 CM |
251 | struct btrfs_key key; |
252 | struct btrfs_trans_handle *trans; | |
5f26f772 CM |
253 | struct btrfs_key found_key; |
254 | int found_type; | |
5f443fd2 | 255 | struct btrfs_leaf *leaf; |
5f26f772 | 256 | char *goodnames = ".."; |
5f443fd2 | 257 | |
5caf2a00 CM |
258 | path = btrfs_alloc_path(); |
259 | BUG_ON(!path); | |
260 | btrfs_init_path(path); | |
5f443fd2 CM |
261 | mutex_lock(&root->fs_info->fs_mutex); |
262 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 263 | btrfs_set_trans_block_group(trans, dir); |
5f443fd2 CM |
264 | key.objectid = inode->i_ino; |
265 | key.offset = (u64)-1; | |
5f26f772 CM |
266 | key.flags = (u32)-1; |
267 | while(1) { | |
268 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
269 | if (ret < 0) { | |
270 | err = ret; | |
271 | goto out; | |
272 | } | |
273 | BUG_ON(ret == 0); | |
274 | if (path->slots[0] == 0) { | |
275 | err = -ENOENT; | |
276 | goto out; | |
277 | } | |
278 | path->slots[0]--; | |
279 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
280 | btrfs_disk_key_to_cpu(&found_key, | |
281 | &leaf->items[path->slots[0]].key); | |
282 | found_type = btrfs_key_type(&found_key); | |
283 | if (found_key.objectid != inode->i_ino) { | |
284 | err = -ENOENT; | |
285 | goto out; | |
286 | } | |
287 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
288 | found_type != BTRFS_DIR_INDEX_KEY) || | |
289 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
290 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
291 | err = -ENOTEMPTY; | |
292 | goto out; | |
293 | } | |
294 | ret = btrfs_del_item(trans, root, path); | |
295 | BUG_ON(ret); | |
5f443fd2 | 296 | |
5f26f772 CM |
297 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) |
298 | break; | |
299 | btrfs_release_path(root, path); | |
5f443fd2 | 300 | } |
5f26f772 | 301 | ret = 0; |
5caf2a00 | 302 | btrfs_release_path(root, path); |
5f443fd2 CM |
303 | |
304 | /* now the directory is empty */ | |
305 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
306 | if (!err) { | |
307 | inode->i_size = 0; | |
308 | } | |
309 | out: | |
7cfcc17e CM |
310 | btrfs_release_path(root, path); |
311 | btrfs_free_path(path); | |
5f443fd2 CM |
312 | mutex_unlock(&root->fs_info->fs_mutex); |
313 | ret = btrfs_end_transaction(trans, root); | |
35b7e476 | 314 | btrfs_btree_balance_dirty(root); |
5f443fd2 CM |
315 | if (ret && !err) |
316 | err = ret; | |
317 | return err; | |
318 | } | |
319 | ||
134e9731 CM |
320 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, |
321 | struct btrfs_root *root, | |
322 | struct inode *inode) | |
323 | { | |
5caf2a00 | 324 | struct btrfs_path *path; |
134e9731 | 325 | int ret; |
5caf2a00 | 326 | |
134e9731 | 327 | clear_inode(inode); |
5caf2a00 CM |
328 | |
329 | path = btrfs_alloc_path(); | |
330 | BUG_ON(!path); | |
331 | btrfs_init_path(path); | |
d6e4a428 CM |
332 | ret = btrfs_lookup_inode(trans, root, path, |
333 | &BTRFS_I(inode)->location, -1); | |
134e9731 | 334 | BUG_ON(ret); |
5caf2a00 | 335 | ret = btrfs_del_item(trans, root, path); |
134e9731 | 336 | BUG_ON(ret); |
5caf2a00 | 337 | btrfs_free_path(path); |
134e9731 CM |
338 | return ret; |
339 | } | |
340 | ||
de428b63 CM |
341 | static void reada_truncate(struct btrfs_root *root, struct btrfs_path *path, |
342 | u64 objectid) | |
343 | { | |
344 | struct btrfs_node *node; | |
345 | int i; | |
346 | int nritems; | |
347 | u64 item_objectid; | |
348 | u64 blocknr; | |
349 | int slot; | |
350 | int ret; | |
351 | ||
352 | if (!path->nodes[1]) | |
353 | return; | |
354 | node = btrfs_buffer_node(path->nodes[1]); | |
355 | slot = path->slots[1]; | |
356 | if (slot == 0) | |
357 | return; | |
358 | nritems = btrfs_header_nritems(&node->header); | |
359 | for (i = slot - 1; i >= 0; i--) { | |
360 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); | |
361 | if (item_objectid != objectid) | |
362 | break; | |
363 | blocknr = btrfs_node_blockptr(node, i); | |
364 | ret = readahead_tree_block(root, blocknr); | |
365 | if (ret) | |
366 | break; | |
367 | } | |
368 | } | |
369 | ||
f4b9aa8d CM |
370 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, |
371 | struct btrfs_root *root, | |
372 | struct inode *inode) | |
373 | { | |
374 | int ret; | |
5caf2a00 | 375 | struct btrfs_path *path; |
f4b9aa8d CM |
376 | struct btrfs_key key; |
377 | struct btrfs_disk_key *found_key; | |
378 | struct btrfs_leaf *leaf; | |
f254e52c CM |
379 | struct btrfs_file_extent_item *fi = NULL; |
380 | u64 extent_start = 0; | |
381 | u64 extent_num_blocks = 0; | |
382 | int found_extent; | |
f4b9aa8d | 383 | |
5caf2a00 CM |
384 | path = btrfs_alloc_path(); |
385 | BUG_ON(!path); | |
f4b9aa8d CM |
386 | /* FIXME, add redo link to tree so we don't leak on crash */ |
387 | key.objectid = inode->i_ino; | |
388 | key.offset = (u64)-1; | |
389 | key.flags = 0; | |
d4dbff95 CM |
390 | /* |
391 | * use BTRFS_CSUM_ITEM_KEY because it is larger than inline keys | |
392 | * or extent data | |
393 | */ | |
f254e52c | 394 | btrfs_set_key_type(&key, BTRFS_CSUM_ITEM_KEY); |
f4b9aa8d | 395 | while(1) { |
5caf2a00 CM |
396 | btrfs_init_path(path); |
397 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
f4b9aa8d | 398 | if (ret < 0) { |
f4b9aa8d CM |
399 | goto error; |
400 | } | |
401 | if (ret > 0) { | |
5caf2a00 CM |
402 | BUG_ON(path->slots[0] == 0); |
403 | path->slots[0]--; | |
f4b9aa8d | 404 | } |
de428b63 | 405 | reada_truncate(root, path, inode->i_ino); |
5caf2a00 CM |
406 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
407 | found_key = &leaf->items[path->slots[0]].key; | |
f4b9aa8d CM |
408 | if (btrfs_disk_key_objectid(found_key) != inode->i_ino) |
409 | break; | |
f254e52c CM |
410 | if (btrfs_disk_key_type(found_key) != BTRFS_CSUM_ITEM_KEY && |
411 | btrfs_disk_key_type(found_key) != BTRFS_EXTENT_DATA_KEY) | |
f4b9aa8d | 412 | break; |
f4b9aa8d CM |
413 | if (btrfs_disk_key_offset(found_key) < inode->i_size) |
414 | break; | |
236454df | 415 | found_extent = 0; |
f254e52c | 416 | if (btrfs_disk_key_type(found_key) == BTRFS_EXTENT_DATA_KEY) { |
5caf2a00 CM |
417 | fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), |
418 | path->slots[0], | |
f254e52c | 419 | struct btrfs_file_extent_item); |
236454df CM |
420 | if (btrfs_file_extent_type(fi) != |
421 | BTRFS_FILE_EXTENT_INLINE) { | |
422 | extent_start = | |
423 | btrfs_file_extent_disk_blocknr(fi); | |
424 | extent_num_blocks = | |
425 | btrfs_file_extent_disk_num_blocks(fi); | |
426 | /* FIXME blocksize != 4096 */ | |
427 | inode->i_blocks -= | |
428 | btrfs_file_extent_num_blocks(fi) << 3; | |
429 | found_extent = 1; | |
430 | } | |
f254e52c | 431 | } |
5caf2a00 | 432 | ret = btrfs_del_item(trans, root, path); |
f4b9aa8d | 433 | BUG_ON(ret); |
5caf2a00 | 434 | btrfs_release_path(root, path); |
f254e52c CM |
435 | if (found_extent) { |
436 | ret = btrfs_free_extent(trans, root, extent_start, | |
437 | extent_num_blocks, 0); | |
438 | BUG_ON(ret); | |
439 | } | |
f4b9aa8d | 440 | } |
f4b9aa8d CM |
441 | ret = 0; |
442 | error: | |
5caf2a00 CM |
443 | btrfs_release_path(root, path); |
444 | btrfs_free_path(path); | |
cd1bc465 | 445 | inode->i_sb->s_dirt = 1; |
f4b9aa8d CM |
446 | return ret; |
447 | } | |
448 | ||
134e9731 CM |
449 | static void btrfs_delete_inode(struct inode *inode) |
450 | { | |
451 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 452 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
453 | int ret; |
454 | ||
134e9731 CM |
455 | truncate_inode_pages(&inode->i_data, 0); |
456 | if (is_bad_inode(inode)) { | |
457 | goto no_delete; | |
458 | } | |
459 | inode->i_size = 0; | |
134e9731 CM |
460 | mutex_lock(&root->fs_info->fs_mutex); |
461 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 462 | btrfs_set_trans_block_group(trans, inode); |
f4b9aa8d CM |
463 | if (S_ISREG(inode->i_mode)) { |
464 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
465 | BUG_ON(ret); | |
466 | } | |
134e9731 CM |
467 | btrfs_free_inode(trans, root, inode); |
468 | btrfs_end_transaction(trans, root); | |
469 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 470 | btrfs_btree_balance_dirty(root); |
134e9731 CM |
471 | return; |
472 | no_delete: | |
473 | clear_inode(inode); | |
474 | } | |
475 | ||
e20d96d6 | 476 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
d6e4a428 | 477 | struct btrfs_key *location) |
e20d96d6 CM |
478 | { |
479 | const char *name = dentry->d_name.name; | |
480 | int namelen = dentry->d_name.len; | |
481 | struct btrfs_dir_item *di; | |
5caf2a00 | 482 | struct btrfs_path *path; |
d6e4a428 | 483 | struct btrfs_root *root = BTRFS_I(dir)->root; |
e20d96d6 CM |
484 | int ret; |
485 | ||
5caf2a00 CM |
486 | path = btrfs_alloc_path(); |
487 | BUG_ON(!path); | |
488 | btrfs_init_path(path); | |
7e38180e | 489 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
e20d96d6 | 490 | namelen, 0); |
7e38180e | 491 | if (!di || IS_ERR(di)) { |
d6e4a428 | 492 | location->objectid = 0; |
2c90e5d6 | 493 | ret = 0; |
e20d96d6 CM |
494 | goto out; |
495 | } | |
d6e4a428 | 496 | btrfs_disk_key_to_cpu(location, &di->location); |
e20d96d6 | 497 | out: |
5caf2a00 CM |
498 | btrfs_release_path(root, path); |
499 | btrfs_free_path(path); | |
e20d96d6 CM |
500 | return ret; |
501 | } | |
502 | ||
35b7e476 | 503 | static int fixup_tree_root_location(struct btrfs_root *root, |
d6e4a428 CM |
504 | struct btrfs_key *location, |
505 | struct btrfs_root **sub_root) | |
506 | { | |
507 | struct btrfs_path *path; | |
508 | struct btrfs_root_item *ri; | |
d6e4a428 CM |
509 | |
510 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
511 | return 0; | |
512 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
513 | return 0; | |
514 | ||
515 | path = btrfs_alloc_path(); | |
516 | BUG_ON(!path); | |
517 | mutex_lock(&root->fs_info->fs_mutex); | |
518 | ||
0f7d52f4 CM |
519 | *sub_root = btrfs_read_fs_root(root->fs_info, location); |
520 | if (IS_ERR(*sub_root)) | |
521 | return PTR_ERR(*sub_root); | |
522 | ||
523 | ri = &(*sub_root)->root_item; | |
d6e4a428 CM |
524 | location->objectid = btrfs_root_dirid(ri); |
525 | location->flags = 0; | |
526 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
527 | location->offset = 0; | |
0f7d52f4 | 528 | |
d6e4a428 CM |
529 | btrfs_free_path(path); |
530 | mutex_unlock(&root->fs_info->fs_mutex); | |
0f7d52f4 | 531 | return 0; |
d6e4a428 CM |
532 | } |
533 | ||
35b7e476 | 534 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
c5739bba CM |
535 | { |
536 | struct btrfs_iget_args *args = p; | |
537 | inode->i_ino = args->ino; | |
538 | BTRFS_I(inode)->root = args->root; | |
539 | return 0; | |
540 | } | |
541 | ||
35b7e476 | 542 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
c5739bba CM |
543 | { |
544 | struct btrfs_iget_args *args = opaque; | |
545 | return (args->ino == inode->i_ino && | |
546 | args->root == BTRFS_I(inode)->root); | |
547 | } | |
548 | ||
35b7e476 CM |
549 | static struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
550 | struct btrfs_root *root) | |
c5739bba CM |
551 | { |
552 | struct inode *inode; | |
553 | struct btrfs_iget_args args; | |
554 | args.ino = objectid; | |
555 | args.root = root; | |
556 | ||
557 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
558 | btrfs_init_locked_inode, | |
559 | (void *)&args); | |
560 | return inode; | |
561 | } | |
d6e4a428 | 562 | |
e20d96d6 CM |
563 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
564 | struct nameidata *nd) | |
565 | { | |
566 | struct inode * inode; | |
d6e4a428 CM |
567 | struct btrfs_inode *bi = BTRFS_I(dir); |
568 | struct btrfs_root *root = bi->root; | |
569 | struct btrfs_root *sub_root = root; | |
570 | struct btrfs_key location; | |
e20d96d6 CM |
571 | int ret; |
572 | ||
573 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
574 | return ERR_PTR(-ENAMETOOLONG); | |
22b0ebda | 575 | mutex_lock(&root->fs_info->fs_mutex); |
d6e4a428 | 576 | ret = btrfs_inode_by_name(dir, dentry, &location); |
22b0ebda | 577 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
578 | if (ret < 0) |
579 | return ERR_PTR(ret); | |
580 | inode = NULL; | |
d6e4a428 CM |
581 | if (location.objectid) { |
582 | ret = fixup_tree_root_location(root, &location, &sub_root); | |
583 | if (ret < 0) | |
584 | return ERR_PTR(ret); | |
585 | if (ret > 0) | |
586 | return ERR_PTR(-ENOENT); | |
c5739bba CM |
587 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
588 | sub_root); | |
e20d96d6 CM |
589 | if (!inode) |
590 | return ERR_PTR(-EACCES); | |
d6e4a428 | 591 | if (inode->i_state & I_NEW) { |
0f7d52f4 | 592 | if (sub_root != root) { |
c5739bba | 593 | printk("adding new root for inode %lu root %p (found %p)\n", inode->i_ino, sub_root, BTRFS_I(inode)->root); |
0f7d52f4 CM |
594 | igrab(inode); |
595 | sub_root->inode = inode; | |
596 | } | |
d6e4a428 CM |
597 | BTRFS_I(inode)->root = sub_root; |
598 | memcpy(&BTRFS_I(inode)->location, &location, | |
599 | sizeof(location)); | |
600 | btrfs_read_locked_inode(inode); | |
601 | unlock_new_inode(inode); | |
602 | } | |
e20d96d6 CM |
603 | } |
604 | return d_splice_alias(inode, dentry); | |
605 | } | |
606 | ||
de428b63 CM |
607 | static void reada_leaves(struct btrfs_root *root, struct btrfs_path *path, |
608 | u64 objectid) | |
090d1875 CM |
609 | { |
610 | struct btrfs_node *node; | |
611 | int i; | |
de428b63 | 612 | u32 nritems; |
090d1875 CM |
613 | u64 item_objectid; |
614 | u64 blocknr; | |
615 | int slot; | |
de428b63 | 616 | int ret; |
090d1875 CM |
617 | |
618 | if (!path->nodes[1]) | |
619 | return; | |
620 | node = btrfs_buffer_node(path->nodes[1]); | |
621 | slot = path->slots[1]; | |
090d1875 | 622 | nritems = btrfs_header_nritems(&node->header); |
de428b63 | 623 | for (i = slot + 1; i < nritems; i++) { |
090d1875 CM |
624 | item_objectid = btrfs_disk_key_objectid(&node->ptrs[i].key); |
625 | if (item_objectid != objectid) | |
626 | break; | |
627 | blocknr = btrfs_node_blockptr(node, i); | |
de428b63 CM |
628 | ret = readahead_tree_block(root, blocknr); |
629 | if (ret) | |
630 | break; | |
090d1875 CM |
631 | } |
632 | } | |
633 | ||
e20d96d6 CM |
634 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
635 | { | |
636 | struct inode *inode = filp->f_path.dentry->d_inode; | |
d6e4a428 | 637 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e20d96d6 CM |
638 | struct btrfs_item *item; |
639 | struct btrfs_dir_item *di; | |
640 | struct btrfs_key key; | |
5caf2a00 | 641 | struct btrfs_path *path; |
e20d96d6 CM |
642 | int ret; |
643 | u32 nritems; | |
644 | struct btrfs_leaf *leaf; | |
645 | int slot; | |
646 | int advance; | |
647 | unsigned char d_type = DT_UNKNOWN; | |
7f5c1516 | 648 | int over = 0; |
7e38180e CM |
649 | u32 di_cur; |
650 | u32 di_total; | |
651 | u32 di_len; | |
652 | int key_type = BTRFS_DIR_INDEX_KEY; | |
d6e4a428 CM |
653 | |
654 | /* FIXME, use a real flag for deciding about the key type */ | |
655 | if (root->fs_info->tree_root == root) | |
656 | key_type = BTRFS_DIR_ITEM_KEY; | |
22b0ebda | 657 | mutex_lock(&root->fs_info->fs_mutex); |
e20d96d6 | 658 | key.objectid = inode->i_ino; |
e20d96d6 | 659 | key.flags = 0; |
d6e4a428 | 660 | btrfs_set_key_type(&key, key_type); |
e20d96d6 | 661 | key.offset = filp->f_pos; |
5caf2a00 CM |
662 | path = btrfs_alloc_path(); |
663 | btrfs_init_path(path); | |
664 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1b05da2e | 665 | if (ret < 0) |
e20d96d6 | 666 | goto err; |
7f5c1516 | 667 | advance = 0; |
de428b63 | 668 | reada_leaves(root, path, inode->i_ino); |
e20d96d6 | 669 | while(1) { |
5caf2a00 | 670 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 671 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 672 | slot = path->slots[0]; |
dee26a9f CM |
673 | if (advance || slot >= nritems) { |
674 | if (slot >= nritems -1) { | |
de428b63 | 675 | reada_leaves(root, path, inode->i_ino); |
5caf2a00 | 676 | ret = btrfs_next_leaf(root, path); |
e20d96d6 CM |
677 | if (ret) |
678 | break; | |
5caf2a00 | 679 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
e20d96d6 | 680 | nritems = btrfs_header_nritems(&leaf->header); |
5caf2a00 | 681 | slot = path->slots[0]; |
e20d96d6 CM |
682 | } else { |
683 | slot++; | |
5caf2a00 | 684 | path->slots[0]++; |
e20d96d6 CM |
685 | } |
686 | } | |
687 | advance = 1; | |
688 | item = leaf->items + slot; | |
e20d96d6 CM |
689 | if (btrfs_disk_key_objectid(&item->key) != key.objectid) |
690 | break; | |
d6e4a428 | 691 | if (btrfs_disk_key_type(&item->key) != key_type) |
a429e513 | 692 | break; |
7f5c1516 CM |
693 | if (btrfs_disk_key_offset(&item->key) < filp->f_pos) |
694 | continue; | |
7fcde0e3 | 695 | filp->f_pos = btrfs_disk_key_offset(&item->key); |
dee26a9f | 696 | advance = 1; |
e20d96d6 | 697 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
7e38180e CM |
698 | di_cur = 0; |
699 | di_total = btrfs_item_size(leaf->items + slot); | |
700 | while(di_cur < di_total) { | |
701 | over = filldir(dirent, (const char *)(di + 1), | |
702 | btrfs_dir_name_len(di), | |
703 | btrfs_disk_key_offset(&item->key), | |
704 | btrfs_disk_key_objectid(&di->location), | |
705 | d_type); | |
706 | if (over) | |
707 | goto nopos; | |
708 | di_len = btrfs_dir_name_len(di) + sizeof(*di); | |
709 | di_cur += di_len; | |
710 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
711 | } | |
e20d96d6 | 712 | } |
7fcde0e3 CM |
713 | filp->f_pos++; |
714 | nopos: | |
e20d96d6 CM |
715 | ret = 0; |
716 | err: | |
5caf2a00 CM |
717 | btrfs_release_path(root, path); |
718 | btrfs_free_path(path); | |
22b0ebda | 719 | mutex_unlock(&root->fs_info->fs_mutex); |
e20d96d6 CM |
720 | return ret; |
721 | } | |
722 | ||
723 | static void btrfs_put_super (struct super_block * sb) | |
724 | { | |
725 | struct btrfs_root *root = btrfs_sb(sb); | |
726 | int ret; | |
727 | ||
728 | ret = close_ctree(root); | |
729 | if (ret) { | |
730 | printk("close ctree returns %d\n", ret); | |
731 | } | |
732 | sb->s_fs_info = NULL; | |
733 | } | |
2e635a27 CM |
734 | |
735 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) | |
736 | { | |
737 | struct inode * inode; | |
e20d96d6 CM |
738 | struct dentry * root_dentry; |
739 | struct btrfs_super_block *disk_super; | |
0f7d52f4 | 740 | struct btrfs_root *tree_root; |
d6e4a428 | 741 | struct btrfs_inode *bi; |
2e635a27 CM |
742 | |
743 | sb->s_maxbytes = MAX_LFS_FILESIZE; | |
2e635a27 | 744 | sb->s_magic = BTRFS_SUPER_MAGIC; |
e20d96d6 | 745 | sb->s_op = &btrfs_super_ops; |
2e635a27 | 746 | sb->s_time_gran = 1; |
e20d96d6 | 747 | |
0f7d52f4 | 748 | tree_root = open_ctree(sb); |
d98237b3 | 749 | |
0f7d52f4 | 750 | if (!tree_root) { |
e20d96d6 CM |
751 | printk("btrfs: open_ctree failed\n"); |
752 | return -EIO; | |
753 | } | |
0f7d52f4 CM |
754 | sb->s_fs_info = tree_root; |
755 | disk_super = tree_root->fs_info->disk_super; | |
e20d96d6 CM |
756 | printk("read in super total blocks %Lu root %Lu\n", |
757 | btrfs_super_total_blocks(disk_super), | |
758 | btrfs_super_root_dir(disk_super)); | |
759 | ||
c5739bba CM |
760 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
761 | tree_root); | |
d6e4a428 CM |
762 | bi = BTRFS_I(inode); |
763 | bi->location.objectid = inode->i_ino; | |
764 | bi->location.offset = 0; | |
765 | bi->location.flags = 0; | |
0f7d52f4 | 766 | bi->root = tree_root; |
d6e4a428 CM |
767 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
768 | ||
2e635a27 CM |
769 | if (!inode) |
770 | return -ENOMEM; | |
e20d96d6 CM |
771 | if (inode->i_state & I_NEW) { |
772 | btrfs_read_locked_inode(inode); | |
773 | unlock_new_inode(inode); | |
774 | } | |
2e635a27 | 775 | |
e20d96d6 CM |
776 | root_dentry = d_alloc_root(inode); |
777 | if (!root_dentry) { | |
2e635a27 CM |
778 | iput(inode); |
779 | return -ENOMEM; | |
780 | } | |
e20d96d6 CM |
781 | sb->s_root = root_dentry; |
782 | ||
2e635a27 CM |
783 | return 0; |
784 | } | |
785 | ||
4730a4bc CM |
786 | static int btrfs_write_inode(struct inode *inode, int wait) |
787 | { | |
d6e4a428 | 788 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4730a4bc | 789 | struct btrfs_trans_handle *trans; |
b5133862 CM |
790 | int ret = 0; |
791 | ||
792 | if (wait) { | |
793 | mutex_lock(&root->fs_info->fs_mutex); | |
794 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 795 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
796 | ret = btrfs_commit_transaction(trans, root); |
797 | mutex_unlock(&root->fs_info->fs_mutex); | |
798 | } | |
799 | return ret; | |
800 | } | |
801 | ||
802 | static void btrfs_dirty_inode(struct inode *inode) | |
803 | { | |
804 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
805 | struct btrfs_trans_handle *trans; | |
4730a4bc CM |
806 | |
807 | mutex_lock(&root->fs_info->fs_mutex); | |
808 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 809 | btrfs_set_trans_block_group(trans, inode); |
b5133862 CM |
810 | btrfs_update_inode(trans, root, inode); |
811 | btrfs_end_transaction(trans, root); | |
4730a4bc | 812 | mutex_unlock(&root->fs_info->fs_mutex); |
35b7e476 | 813 | btrfs_btree_balance_dirty(root); |
4730a4bc CM |
814 | } |
815 | ||
d5719762 | 816 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2619ba1f | 817 | struct btrfs_root *root, |
31f3c99b CM |
818 | u64 objectid, |
819 | struct btrfs_block_group_cache *group, | |
820 | int mode) | |
d5719762 CM |
821 | { |
822 | struct inode *inode; | |
823 | struct btrfs_inode_item inode_item; | |
1b05da2e | 824 | struct btrfs_key *location; |
d5719762 | 825 | int ret; |
de428b63 | 826 | int owner; |
d5719762 | 827 | |
2619ba1f | 828 | inode = new_inode(root->fs_info->sb); |
d5719762 CM |
829 | if (!inode) |
830 | return ERR_PTR(-ENOMEM); | |
831 | ||
2619ba1f | 832 | BTRFS_I(inode)->root = root; |
de428b63 CM |
833 | if (mode & S_IFDIR) |
834 | owner = 0; | |
835 | else | |
836 | owner = 1; | |
837 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
31f3c99b | 838 | BTRFS_I(inode)->block_group = group; |
d5719762 CM |
839 | |
840 | inode->i_uid = current->fsuid; | |
841 | inode->i_gid = current->fsgid; | |
842 | inode->i_mode = mode; | |
843 | inode->i_ino = objectid; | |
844 | inode->i_blocks = 0; | |
c5739bba | 845 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
d5719762 | 846 | fill_inode_item(&inode_item, inode); |
1b05da2e CM |
847 | location = &BTRFS_I(inode)->location; |
848 | location->objectid = objectid; | |
849 | location->flags = 0; | |
850 | location->offset = 0; | |
851 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
d5719762 CM |
852 | |
853 | ret = btrfs_insert_inode(trans, root, objectid, &inode_item); | |
854 | BUG_ON(ret); | |
855 | ||
856 | insert_inode_hash(inode); | |
d5719762 CM |
857 | return inode; |
858 | } | |
859 | ||
860 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
861 | struct dentry *dentry, struct inode *inode) | |
862 | { | |
863 | int ret; | |
d6e4a428 CM |
864 | struct btrfs_key key; |
865 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
866 | key.objectid = inode->i_ino; | |
867 | key.flags = 0; | |
868 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
869 | key.offset = 0; | |
870 | ||
871 | ret = btrfs_insert_dir_item(trans, root, | |
d5719762 CM |
872 | dentry->d_name.name, dentry->d_name.len, |
873 | dentry->d_parent->d_inode->i_ino, | |
d6e4a428 | 874 | &key, 0); |
4730a4bc | 875 | if (ret == 0) { |
5f26f772 | 876 | dentry->d_parent->d_inode->i_size += dentry->d_name.len * 2; |
d6e4a428 | 877 | ret = btrfs_update_inode(trans, root, |
4730a4bc CM |
878 | dentry->d_parent->d_inode); |
879 | } | |
d5719762 CM |
880 | return ret; |
881 | } | |
882 | ||
883 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
884 | struct dentry *dentry, struct inode *inode) | |
885 | { | |
886 | int err = btrfs_add_link(trans, dentry, inode); | |
887 | if (!err) { | |
888 | d_instantiate(dentry, inode); | |
889 | return 0; | |
890 | } | |
2c90e5d6 CM |
891 | if (err > 0) |
892 | err = -EEXIST; | |
d5719762 CM |
893 | return err; |
894 | } | |
895 | ||
896 | static int btrfs_create(struct inode *dir, struct dentry *dentry, | |
897 | int mode, struct nameidata *nd) | |
898 | { | |
899 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 900 | struct btrfs_root *root = BTRFS_I(dir)->root; |
d5719762 CM |
901 | struct inode *inode; |
902 | int err; | |
134e9731 | 903 | int drop_inode = 0; |
2619ba1f | 904 | u64 objectid; |
d5719762 | 905 | |
d561c025 | 906 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 | 907 | trans = btrfs_start_transaction(root, 1); |
31f3c99b | 908 | btrfs_set_trans_block_group(trans, dir); |
2619ba1f CM |
909 | |
910 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
911 | if (err) { | |
912 | err = -ENOSPC; | |
913 | goto out_unlock; | |
914 | } | |
915 | ||
31f3c99b CM |
916 | inode = btrfs_new_inode(trans, root, objectid, |
917 | BTRFS_I(dir)->block_group, mode); | |
d5719762 CM |
918 | err = PTR_ERR(inode); |
919 | if (IS_ERR(inode)) | |
d561c025 | 920 | goto out_unlock; |
31f3c99b CM |
921 | |
922 | btrfs_set_trans_block_group(trans, inode); | |
d5719762 | 923 | err = btrfs_add_nondir(trans, dentry, inode); |
134e9731 CM |
924 | if (err) |
925 | drop_inode = 1; | |
dee26a9f CM |
926 | else { |
927 | inode->i_mapping->a_ops = &btrfs_aops; | |
928 | inode->i_fop = &btrfs_file_operations; | |
929 | inode->i_op = &btrfs_file_inode_operations; | |
930 | } | |
d5719762 | 931 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
932 | btrfs_update_inode_block_group(trans, inode); |
933 | btrfs_update_inode_block_group(trans, dir); | |
d561c025 | 934 | out_unlock: |
22b0ebda | 935 | btrfs_end_transaction(trans, root); |
d561c025 | 936 | mutex_unlock(&root->fs_info->fs_mutex); |
2c90e5d6 | 937 | |
134e9731 CM |
938 | if (drop_inode) { |
939 | inode_dec_link_count(inode); | |
940 | iput(inode); | |
941 | } | |
35b7e476 | 942 | btrfs_btree_balance_dirty(root); |
d5719762 CM |
943 | return err; |
944 | } | |
945 | ||
f7922033 | 946 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, |
2619ba1f CM |
947 | struct btrfs_root *root, |
948 | u64 objectid, u64 dirid) | |
f7922033 | 949 | { |
f7922033 CM |
950 | int ret; |
951 | char buf[2]; | |
d6e4a428 CM |
952 | struct btrfs_key key; |
953 | ||
f7922033 CM |
954 | buf[0] = '.'; |
955 | buf[1] = '.'; | |
956 | ||
2619ba1f | 957 | key.objectid = objectid; |
d6e4a428 CM |
958 | key.offset = 0; |
959 | key.flags = 0; | |
960 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); | |
961 | ||
2619ba1f | 962 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, |
d6e4a428 | 963 | &key, 1); |
f7922033 CM |
964 | if (ret) |
965 | goto error; | |
2619ba1f CM |
966 | key.objectid = dirid; |
967 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
d6e4a428 | 968 | &key, 1); |
4730a4bc CM |
969 | if (ret) |
970 | goto error; | |
f7922033 CM |
971 | error: |
972 | return ret; | |
973 | } | |
974 | ||
975 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
976 | { | |
977 | struct inode *inode; | |
978 | struct btrfs_trans_handle *trans; | |
d6e4a428 | 979 | struct btrfs_root *root = BTRFS_I(dir)->root; |
f7922033 CM |
980 | int err = 0; |
981 | int drop_on_err = 0; | |
2619ba1f | 982 | u64 objectid; |
f7922033 CM |
983 | |
984 | mutex_lock(&root->fs_info->fs_mutex); | |
985 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 986 | btrfs_set_trans_block_group(trans, dir); |
f7922033 CM |
987 | if (IS_ERR(trans)) { |
988 | err = PTR_ERR(trans); | |
989 | goto out_unlock; | |
990 | } | |
2619ba1f CM |
991 | |
992 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
993 | if (err) { | |
994 | err = -ENOSPC; | |
995 | goto out_unlock; | |
996 | } | |
997 | ||
31f3c99b CM |
998 | inode = btrfs_new_inode(trans, root, objectid, |
999 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
f7922033 CM |
1000 | if (IS_ERR(inode)) { |
1001 | err = PTR_ERR(inode); | |
1002 | goto out_fail; | |
1003 | } | |
1004 | drop_on_err = 1; | |
1005 | inode->i_op = &btrfs_dir_inode_operations; | |
1006 | inode->i_fop = &btrfs_dir_file_operations; | |
31f3c99b | 1007 | btrfs_set_trans_block_group(trans, inode); |
f7922033 | 1008 | |
2619ba1f CM |
1009 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); |
1010 | if (err) | |
1011 | goto out_fail; | |
1012 | ||
1013 | inode->i_size = 6; | |
1014 | err = btrfs_update_inode(trans, root, inode); | |
f7922033 CM |
1015 | if (err) |
1016 | goto out_fail; | |
1017 | err = btrfs_add_link(trans, dentry, inode); | |
1018 | if (err) | |
1019 | goto out_fail; | |
1020 | d_instantiate(dentry, inode); | |
f7922033 | 1021 | drop_on_err = 0; |
cd1bc465 | 1022 | dir->i_sb->s_dirt = 1; |
31f3c99b CM |
1023 | btrfs_update_inode_block_group(trans, inode); |
1024 | btrfs_update_inode_block_group(trans, dir); | |
f7922033 CM |
1025 | |
1026 | out_fail: | |
1027 | btrfs_end_transaction(trans, root); | |
1028 | out_unlock: | |
1029 | mutex_unlock(&root->fs_info->fs_mutex); | |
1030 | if (drop_on_err) | |
1031 | iput(inode); | |
35b7e476 | 1032 | btrfs_btree_balance_dirty(root); |
f7922033 CM |
1033 | return err; |
1034 | } | |
1035 | ||
8fd17795 CM |
1036 | static int btrfs_sync_file(struct file *file, |
1037 | struct dentry *dentry, int datasync) | |
1038 | { | |
1039 | struct inode *inode = dentry->d_inode; | |
1040 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1041 | int ret; | |
1042 | struct btrfs_trans_handle *trans; | |
1043 | ||
1044 | mutex_lock(&root->fs_info->fs_mutex); | |
1045 | trans = btrfs_start_transaction(root, 1); | |
1046 | if (!trans) { | |
1047 | ret = -ENOMEM; | |
1048 | goto out; | |
1049 | } | |
1050 | ret = btrfs_commit_transaction(trans, root); | |
1051 | mutex_unlock(&root->fs_info->fs_mutex); | |
1052 | out: | |
1053 | return ret > 0 ? EIO : ret; | |
1054 | } | |
1055 | ||
d5719762 CM |
1056 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
1057 | { | |
1058 | struct btrfs_trans_handle *trans; | |
1059 | struct btrfs_root *root; | |
1060 | int ret; | |
d98237b3 | 1061 | root = btrfs_sb(sb); |
df2ce34c | 1062 | |
d5719762 | 1063 | sb->s_dirt = 0; |
d561c025 | 1064 | if (!wait) { |
7cfcc17e | 1065 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
d561c025 CM |
1066 | return 0; |
1067 | } | |
d561c025 | 1068 | mutex_lock(&root->fs_info->fs_mutex); |
d5719762 CM |
1069 | trans = btrfs_start_transaction(root, 1); |
1070 | ret = btrfs_commit_transaction(trans, root); | |
1071 | sb->s_dirt = 0; | |
1072 | BUG_ON(ret); | |
1073 | printk("btrfs sync_fs\n"); | |
d561c025 | 1074 | mutex_unlock(&root->fs_info->fs_mutex); |
d5719762 CM |
1075 | return 0; |
1076 | } | |
1077 | ||
75dfe396 | 1078 | static int btrfs_get_block_lock(struct inode *inode, sector_t iblock, |
dee26a9f CM |
1079 | struct buffer_head *result, int create) |
1080 | { | |
1081 | int ret; | |
1082 | int err = 0; | |
1083 | u64 blocknr; | |
1084 | u64 extent_start = 0; | |
1085 | u64 extent_end = 0; | |
1086 | u64 objectid = inode->i_ino; | |
236454df | 1087 | u32 found_type; |
5caf2a00 | 1088 | struct btrfs_path *path; |
d6e4a428 | 1089 | struct btrfs_root *root = BTRFS_I(inode)->root; |
dee26a9f CM |
1090 | struct btrfs_file_extent_item *item; |
1091 | struct btrfs_leaf *leaf; | |
1092 | struct btrfs_disk_key *found_key; | |
1093 | ||
5caf2a00 CM |
1094 | path = btrfs_alloc_path(); |
1095 | BUG_ON(!path); | |
1096 | btrfs_init_path(path); | |
6567e837 | 1097 | if (create) { |
6567e837 CM |
1098 | WARN_ON(1); |
1099 | } | |
dee26a9f | 1100 | |
236454df | 1101 | ret = btrfs_lookup_file_extent(NULL, root, path, |
9773a788 | 1102 | inode->i_ino, |
236454df | 1103 | iblock << inode->i_blkbits, 0); |
dee26a9f | 1104 | if (ret < 0) { |
dee26a9f CM |
1105 | err = ret; |
1106 | goto out; | |
1107 | } | |
1108 | ||
1109 | if (ret != 0) { | |
5caf2a00 CM |
1110 | if (path->slots[0] == 0) { |
1111 | btrfs_release_path(root, path); | |
236454df | 1112 | goto out; |
dee26a9f | 1113 | } |
5caf2a00 | 1114 | path->slots[0]--; |
dee26a9f CM |
1115 | } |
1116 | ||
5caf2a00 | 1117 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 1118 | struct btrfs_file_extent_item); |
5caf2a00 | 1119 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
dee26a9f CM |
1120 | blocknr = btrfs_file_extent_disk_blocknr(item); |
1121 | blocknr += btrfs_file_extent_offset(item); | |
1122 | ||
dee26a9f | 1123 | /* are we inside the extent that was found? */ |
5caf2a00 | 1124 | found_key = &leaf->items[path->slots[0]].key; |
236454df | 1125 | found_type = btrfs_disk_key_type(found_key); |
dee26a9f | 1126 | if (btrfs_disk_key_objectid(found_key) != objectid || |
236454df | 1127 | found_type != BTRFS_EXTENT_DATA_KEY) { |
dee26a9f CM |
1128 | extent_end = 0; |
1129 | extent_start = 0; | |
dee26a9f CM |
1130 | goto out; |
1131 | } | |
236454df CM |
1132 | found_type = btrfs_file_extent_type(item); |
1133 | extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key); | |
1134 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1135 | extent_start = extent_start >> inode->i_blkbits; | |
1136 | extent_end = extent_start + btrfs_file_extent_num_blocks(item); | |
1137 | if (iblock >= extent_start && iblock < extent_end) { | |
1138 | err = 0; | |
1139 | btrfs_map_bh_to_logical(root, result, blocknr + | |
1140 | iblock - extent_start); | |
1141 | goto out; | |
1142 | } | |
1143 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1144 | char *ptr; | |
1145 | char *map; | |
1146 | u32 size; | |
1147 | size = btrfs_file_extent_inline_len(leaf->items + | |
1148 | path->slots[0]); | |
1149 | extent_end = (extent_start + size) >> inode->i_blkbits; | |
1150 | extent_start >>= inode->i_blkbits; | |
1151 | if (iblock < extent_start || iblock > extent_end) { | |
1152 | goto out; | |
1153 | } | |
1154 | ptr = btrfs_file_extent_inline_start(item); | |
1155 | map = kmap(result->b_page); | |
1156 | memcpy(map, ptr, size); | |
1157 | memset(map + size, 0, PAGE_CACHE_SIZE - size); | |
1158 | flush_dcache_page(result->b_page); | |
1159 | kunmap(result->b_page); | |
1160 | set_buffer_uptodate(result); | |
1161 | SetPageChecked(result->b_page); | |
1162 | btrfs_map_bh_to_logical(root, result, 0); | |
dee26a9f | 1163 | } |
dee26a9f | 1164 | out: |
5caf2a00 | 1165 | btrfs_free_path(path); |
75dfe396 CM |
1166 | return err; |
1167 | } | |
1168 | ||
1169 | static int btrfs_get_block(struct inode *inode, sector_t iblock, | |
1170 | struct buffer_head *result, int create) | |
1171 | { | |
1172 | int err; | |
d6e4a428 | 1173 | struct btrfs_root *root = BTRFS_I(inode)->root; |
75dfe396 | 1174 | mutex_lock(&root->fs_info->fs_mutex); |
e8f05c45 | 1175 | err = btrfs_get_block_lock(inode, iblock, result, create); |
dee26a9f CM |
1176 | mutex_unlock(&root->fs_info->fs_mutex); |
1177 | return err; | |
1178 | } | |
1179 | ||
1180 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1181 | unsigned from, unsigned to) | |
1182 | { | |
6407bf6d | 1183 | return nobh_prepare_write(page, from, to, btrfs_get_block); |
dee26a9f CM |
1184 | } |
1185 | ||
d561c025 CM |
1186 | static void btrfs_write_super(struct super_block *sb) |
1187 | { | |
1188 | btrfs_sync_fs(sb, 1); | |
1189 | } | |
1190 | ||
dee26a9f CM |
1191 | static int btrfs_readpage(struct file *file, struct page *page) |
1192 | { | |
1193 | return mpage_readpage(page, btrfs_get_block); | |
1194 | } | |
1195 | ||
236454df CM |
1196 | /* |
1197 | * While block_write_full_page is writing back the dirty buffers under | |
1198 | * the page lock, whoever dirtied the buffers may decide to clean them | |
1199 | * again at any time. We handle that by only looking at the buffer | |
1200 | * state inside lock_buffer(). | |
1201 | * | |
1202 | * If block_write_full_page() is called for regular writeback | |
1203 | * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a | |
1204 | * locked buffer. This only can happen if someone has written the buffer | |
1205 | * directly, with submit_bh(). At the address_space level PageWriteback | |
1206 | * prevents this contention from occurring. | |
1207 | */ | |
1208 | static int __btrfs_write_full_page(struct inode *inode, struct page *page, | |
1209 | struct writeback_control *wbc) | |
1210 | { | |
1211 | int err; | |
1212 | sector_t block; | |
1213 | sector_t last_block; | |
1214 | struct buffer_head *bh, *head; | |
1215 | const unsigned blocksize = 1 << inode->i_blkbits; | |
1216 | int nr_underway = 0; | |
1217 | ||
1218 | BUG_ON(!PageLocked(page)); | |
1219 | ||
1220 | last_block = (i_size_read(inode) - 1) >> inode->i_blkbits; | |
1221 | ||
1222 | if (!page_has_buffers(page)) { | |
1223 | create_empty_buffers(page, blocksize, | |
1224 | (1 << BH_Dirty)|(1 << BH_Uptodate)); | |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * Be very careful. We have no exclusion from __set_page_dirty_buffers | |
1229 | * here, and the (potentially unmapped) buffers may become dirty at | |
1230 | * any time. If a buffer becomes dirty here after we've inspected it | |
1231 | * then we just miss that fact, and the page stays dirty. | |
1232 | * | |
1233 | * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; | |
1234 | * handle that here by just cleaning them. | |
1235 | */ | |
1236 | ||
1237 | block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); | |
1238 | head = page_buffers(page); | |
1239 | bh = head; | |
1240 | ||
1241 | /* | |
1242 | * Get all the dirty buffers mapped to disk addresses and | |
1243 | * handle any aliases from the underlying blockdev's mapping. | |
1244 | */ | |
1245 | do { | |
1246 | if (block > last_block) { | |
1247 | /* | |
1248 | * mapped buffers outside i_size will occur, because | |
1249 | * this page can be outside i_size when there is a | |
1250 | * truncate in progress. | |
1251 | */ | |
1252 | /* | |
1253 | * The buffer was zeroed by block_write_full_page() | |
1254 | */ | |
1255 | clear_buffer_dirty(bh); | |
1256 | set_buffer_uptodate(bh); | |
1257 | } else if (!buffer_mapped(bh) && buffer_dirty(bh)) { | |
1258 | WARN_ON(bh->b_size != blocksize); | |
1259 | err = btrfs_get_block(inode, block, bh, 0); | |
35b7e476 CM |
1260 | if (err) { |
1261 | printk("writepage going to recovery err %d\n", err); | |
236454df | 1262 | goto recover; |
35b7e476 | 1263 | } |
236454df CM |
1264 | if (buffer_new(bh)) { |
1265 | /* blockdev mappings never come here */ | |
1266 | clear_buffer_new(bh); | |
236454df CM |
1267 | } |
1268 | } | |
1269 | bh = bh->b_this_page; | |
1270 | block++; | |
1271 | } while (bh != head); | |
1272 | ||
1273 | do { | |
1274 | if (!buffer_mapped(bh)) | |
1275 | continue; | |
1276 | /* | |
1277 | * If it's a fully non-blocking write attempt and we cannot | |
1278 | * lock the buffer then redirty the page. Note that this can | |
1279 | * potentially cause a busy-wait loop from pdflush and kswapd | |
1280 | * activity, but those code paths have their own higher-level | |
1281 | * throttling. | |
1282 | */ | |
1283 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
1284 | lock_buffer(bh); | |
1285 | } else if (test_set_buffer_locked(bh)) { | |
1286 | redirty_page_for_writepage(wbc, page); | |
1287 | continue; | |
1288 | } | |
1289 | if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) { | |
1290 | mark_buffer_async_write(bh); | |
1291 | } else { | |
1292 | unlock_buffer(bh); | |
1293 | } | |
1294 | } while ((bh = bh->b_this_page) != head); | |
1295 | ||
1296 | /* | |
1297 | * The page and its buffers are protected by PageWriteback(), so we can | |
1298 | * drop the bh refcounts early. | |
1299 | */ | |
1300 | BUG_ON(PageWriteback(page)); | |
1301 | set_page_writeback(page); | |
1302 | ||
1303 | do { | |
1304 | struct buffer_head *next = bh->b_this_page; | |
1305 | if (buffer_async_write(bh)) { | |
1306 | submit_bh(WRITE, bh); | |
1307 | nr_underway++; | |
1308 | } | |
1309 | bh = next; | |
1310 | } while (bh != head); | |
1311 | unlock_page(page); | |
1312 | ||
1313 | err = 0; | |
1314 | done: | |
1315 | if (nr_underway == 0) { | |
1316 | /* | |
1317 | * The page was marked dirty, but the buffers were | |
1318 | * clean. Someone wrote them back by hand with | |
1319 | * ll_rw_block/submit_bh. A rare case. | |
1320 | */ | |
1321 | int uptodate = 1; | |
1322 | do { | |
1323 | if (!buffer_uptodate(bh)) { | |
1324 | uptodate = 0; | |
1325 | break; | |
1326 | } | |
1327 | bh = bh->b_this_page; | |
1328 | } while (bh != head); | |
1329 | if (uptodate) | |
1330 | SetPageUptodate(page); | |
1331 | end_page_writeback(page); | |
236454df CM |
1332 | } |
1333 | return err; | |
1334 | ||
1335 | recover: | |
1336 | /* | |
1337 | * ENOSPC, or some other error. We may already have added some | |
1338 | * blocks to the file, so we need to write these out to avoid | |
1339 | * exposing stale data. | |
1340 | * The page is currently locked and not marked for writeback | |
1341 | */ | |
1342 | bh = head; | |
1343 | /* Recovery: lock and submit the mapped buffers */ | |
1344 | do { | |
1345 | if (buffer_mapped(bh) && buffer_dirty(bh)) { | |
1346 | lock_buffer(bh); | |
1347 | mark_buffer_async_write(bh); | |
1348 | } else { | |
1349 | /* | |
1350 | * The buffer may have been set dirty during | |
1351 | * attachment to a dirty page. | |
1352 | */ | |
1353 | clear_buffer_dirty(bh); | |
1354 | } | |
1355 | } while ((bh = bh->b_this_page) != head); | |
1356 | SetPageError(page); | |
1357 | BUG_ON(PageWriteback(page)); | |
1358 | set_page_writeback(page); | |
1359 | do { | |
1360 | struct buffer_head *next = bh->b_this_page; | |
1361 | if (buffer_async_write(bh)) { | |
1362 | clear_buffer_dirty(bh); | |
1363 | submit_bh(WRITE, bh); | |
1364 | nr_underway++; | |
1365 | } | |
1366 | bh = next; | |
1367 | } while (bh != head); | |
1368 | unlock_page(page); | |
1369 | goto done; | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * The generic ->writepage function for buffer-backed address_spaces | |
1374 | */ | |
dee26a9f CM |
1375 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
1376 | { | |
236454df CM |
1377 | struct inode * const inode = page->mapping->host; |
1378 | loff_t i_size = i_size_read(inode); | |
1379 | const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; | |
1380 | unsigned offset; | |
1381 | void *kaddr; | |
1382 | ||
1383 | /* Is the page fully inside i_size? */ | |
1384 | if (page->index < end_index) | |
1385 | return __btrfs_write_full_page(inode, page, wbc); | |
1386 | ||
1387 | /* Is the page fully outside i_size? (truncate in progress) */ | |
1388 | offset = i_size & (PAGE_CACHE_SIZE-1); | |
1389 | if (page->index >= end_index+1 || !offset) { | |
1390 | /* | |
1391 | * The page may have dirty, unmapped buffers. For example, | |
1392 | * they may have been added in ext3_writepage(). Make them | |
1393 | * freeable here, so the page does not leak. | |
1394 | */ | |
1395 | block_invalidatepage(page, 0); | |
1396 | unlock_page(page); | |
1397 | return 0; /* don't care */ | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * The page straddles i_size. It must be zeroed out on each and every | |
1402 | * writepage invokation because it may be mmapped. "A file is mapped | |
1403 | * in multiples of the page size. For a file that is not a multiple of | |
1404 | * the page size, the remaining memory is zeroed when mapped, and | |
1405 | * writes to that region are not written out to the file." | |
1406 | */ | |
1407 | kaddr = kmap_atomic(page, KM_USER0); | |
1408 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1409 | flush_dcache_page(page); | |
1410 | kunmap_atomic(kaddr, KM_USER0); | |
1411 | return __btrfs_write_full_page(inode, page, wbc); | |
dee26a9f | 1412 | } |
d561c025 | 1413 | |
f4b9aa8d CM |
1414 | static void btrfs_truncate(struct inode *inode) |
1415 | { | |
d6e4a428 | 1416 | struct btrfs_root *root = BTRFS_I(inode)->root; |
f4b9aa8d CM |
1417 | int ret; |
1418 | struct btrfs_trans_handle *trans; | |
1419 | ||
1420 | if (!S_ISREG(inode->i_mode)) | |
1421 | return; | |
1422 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1423 | return; | |
1424 | ||
e8f05c45 | 1425 | nobh_truncate_page(inode->i_mapping, inode->i_size); |
f4b9aa8d CM |
1426 | |
1427 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1428 | mutex_lock(&root->fs_info->fs_mutex); | |
1429 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1430 | btrfs_set_trans_block_group(trans, inode); |
f4b9aa8d CM |
1431 | ret = btrfs_truncate_in_trans(trans, root, inode); |
1432 | BUG_ON(ret); | |
35b7e476 | 1433 | btrfs_update_inode(trans, root, inode); |
f4b9aa8d CM |
1434 | ret = btrfs_end_transaction(trans, root); |
1435 | BUG_ON(ret); | |
1436 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 1437 | btrfs_btree_balance_dirty(root); |
f4b9aa8d CM |
1438 | } |
1439 | ||
236454df CM |
1440 | /* |
1441 | * Make sure any changes to nobh_commit_write() are reflected in | |
1442 | * nobh_truncate_page(), since it doesn't call commit_write(). | |
1443 | */ | |
1444 | static int btrfs_commit_write(struct file *file, struct page *page, | |
1445 | unsigned from, unsigned to) | |
1446 | { | |
1447 | struct inode *inode = page->mapping->host; | |
1448 | struct buffer_head *bh; | |
1449 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; | |
1450 | ||
1451 | SetPageUptodate(page); | |
1452 | bh = page_buffers(page); | |
1453 | if (buffer_mapped(bh) && bh->b_blocknr != 0) { | |
1454 | set_page_dirty(page); | |
1455 | } | |
1456 | if (pos > inode->i_size) { | |
1457 | i_size_write(inode, pos); | |
1458 | mark_inode_dirty(inode); | |
1459 | } | |
1460 | return 0; | |
1461 | } | |
1462 | ||
75dfe396 CM |
1463 | static int btrfs_copy_from_user(loff_t pos, int num_pages, int write_bytes, |
1464 | struct page **prepared_pages, | |
1465 | const char __user * buf) | |
1466 | { | |
1467 | long page_fault = 0; | |
1468 | int i; | |
1469 | int offset = pos & (PAGE_CACHE_SIZE - 1); | |
1470 | ||
1471 | for (i = 0; i < num_pages && write_bytes > 0; i++, offset = 0) { | |
1472 | size_t count = min_t(size_t, | |
1473 | PAGE_CACHE_SIZE - offset, write_bytes); | |
1474 | struct page *page = prepared_pages[i]; | |
1475 | fault_in_pages_readable(buf, count); | |
1476 | ||
1477 | /* Copy data from userspace to the current page */ | |
1478 | kmap(page); | |
1479 | page_fault = __copy_from_user(page_address(page) + offset, | |
1480 | buf, count); | |
1481 | /* Flush processor's dcache for this page */ | |
1482 | flush_dcache_page(page); | |
1483 | kunmap(page); | |
1484 | buf += count; | |
1485 | write_bytes -= count; | |
1486 | ||
1487 | if (page_fault) | |
1488 | break; | |
1489 | } | |
1490 | return page_fault ? -EFAULT : 0; | |
1491 | } | |
1492 | ||
1493 | static void btrfs_drop_pages(struct page **pages, size_t num_pages) | |
1494 | { | |
1495 | size_t i; | |
1496 | for (i = 0; i < num_pages; i++) { | |
1497 | if (!pages[i]) | |
1498 | break; | |
1499 | unlock_page(pages[i]); | |
1500 | mark_page_accessed(pages[i]); | |
1501 | page_cache_release(pages[i]); | |
1502 | } | |
1503 | } | |
1504 | static int dirty_and_release_pages(struct btrfs_trans_handle *trans, | |
1505 | struct btrfs_root *root, | |
1506 | struct file *file, | |
1507 | struct page **pages, | |
1508 | size_t num_pages, | |
1509 | loff_t pos, | |
1510 | size_t write_bytes) | |
1511 | { | |
1512 | int i; | |
1513 | int offset; | |
1514 | int err = 0; | |
1515 | int ret; | |
1516 | int this_write; | |
f254e52c | 1517 | struct inode *inode = file->f_path.dentry->d_inode; |
236454df CM |
1518 | struct buffer_head *bh; |
1519 | struct btrfs_file_extent_item *ei; | |
75dfe396 CM |
1520 | |
1521 | for (i = 0; i < num_pages; i++) { | |
1522 | offset = pos & (PAGE_CACHE_SIZE -1); | |
1523 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
f254e52c CM |
1524 | /* FIXME, one block at a time */ |
1525 | ||
1526 | mutex_lock(&root->fs_info->fs_mutex); | |
1527 | trans = btrfs_start_transaction(root, 1); | |
31f3c99b | 1528 | btrfs_set_trans_block_group(trans, inode); |
236454df CM |
1529 | |
1530 | bh = page_buffers(pages[i]); | |
1531 | if (buffer_mapped(bh) && bh->b_blocknr == 0) { | |
1532 | struct btrfs_key key; | |
1533 | struct btrfs_path *path; | |
1534 | char *ptr; | |
1535 | u32 datasize; | |
1536 | ||
1537 | path = btrfs_alloc_path(); | |
1538 | BUG_ON(!path); | |
1539 | key.objectid = inode->i_ino; | |
1540 | key.offset = pages[i]->index << PAGE_CACHE_SHIFT; | |
1541 | key.flags = 0; | |
1542 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
1543 | BUG_ON(write_bytes >= PAGE_CACHE_SIZE); | |
1544 | datasize = offset + | |
1545 | btrfs_file_extent_calc_inline_size(write_bytes); | |
1546 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
1547 | datasize); | |
1548 | BUG_ON(ret); | |
1549 | ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
1550 | path->slots[0], struct btrfs_file_extent_item); | |
1551 | btrfs_set_file_extent_generation(ei, trans->transid); | |
1552 | btrfs_set_file_extent_type(ei, | |
1553 | BTRFS_FILE_EXTENT_INLINE); | |
1554 | ptr = btrfs_file_extent_inline_start(ei); | |
098f59c2 CM |
1555 | btrfs_memcpy(root, path->nodes[0]->b_data, |
1556 | ptr, bh->b_data, offset + write_bytes); | |
236454df CM |
1557 | mark_buffer_dirty(path->nodes[0]); |
1558 | btrfs_free_path(path); | |
1559 | } else { | |
1560 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
f254e52c CM |
1561 | pages[i]->index << PAGE_CACHE_SHIFT, |
1562 | kmap(pages[i]), PAGE_CACHE_SIZE); | |
236454df CM |
1563 | kunmap(pages[i]); |
1564 | } | |
f254e52c | 1565 | SetPageChecked(pages[i]); |
e37c9e69 | 1566 | // btrfs_update_inode_block_group(trans, inode); |
f254e52c CM |
1567 | ret = btrfs_end_transaction(trans, root); |
1568 | BUG_ON(ret); | |
1569 | mutex_unlock(&root->fs_info->fs_mutex); | |
1570 | ||
236454df | 1571 | ret = btrfs_commit_write(file, pages[i], offset, |
75dfe396 CM |
1572 | offset + this_write); |
1573 | pos += this_write; | |
1574 | if (ret) { | |
1575 | err = ret; | |
1576 | goto failed; | |
1577 | } | |
1578 | WARN_ON(this_write > write_bytes); | |
1579 | write_bytes -= this_write; | |
1580 | } | |
1581 | failed: | |
1582 | return err; | |
1583 | } | |
1584 | ||
b18c6685 CM |
1585 | static int drop_extents(struct btrfs_trans_handle *trans, |
1586 | struct btrfs_root *root, | |
1587 | struct inode *inode, | |
de428b63 | 1588 | u64 start, u64 end, u64 *hint_block) |
b18c6685 CM |
1589 | { |
1590 | int ret; | |
1591 | struct btrfs_key key; | |
1592 | struct btrfs_leaf *leaf; | |
1593 | int slot; | |
1594 | struct btrfs_file_extent_item *extent; | |
236454df | 1595 | u64 extent_end = 0; |
b18c6685 CM |
1596 | int keep; |
1597 | struct btrfs_file_extent_item old; | |
1598 | struct btrfs_path *path; | |
1599 | u64 search_start = start; | |
1600 | int bookend; | |
236454df CM |
1601 | int found_type; |
1602 | int found_extent; | |
1603 | int found_inline; | |
1604 | ||
b18c6685 CM |
1605 | path = btrfs_alloc_path(); |
1606 | if (!path) | |
1607 | return -ENOMEM; | |
a429e513 CM |
1608 | while(1) { |
1609 | btrfs_release_path(root, path); | |
1610 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
1611 | search_start, -1); | |
1612 | if (ret < 0) | |
70b2befd | 1613 | goto out; |
a429e513 CM |
1614 | if (ret > 0) { |
1615 | if (path->slots[0] == 0) { | |
236454df | 1616 | ret = 0; |
a429e513 CM |
1617 | goto out; |
1618 | } | |
1619 | path->slots[0]--; | |
70b2befd | 1620 | } |
b18c6685 CM |
1621 | keep = 0; |
1622 | bookend = 0; | |
236454df CM |
1623 | found_extent = 0; |
1624 | found_inline = 0; | |
1625 | extent = NULL; | |
b18c6685 CM |
1626 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
1627 | slot = path->slots[0]; | |
1628 | btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); | |
b18c6685 CM |
1629 | if (key.offset >= end || key.objectid != inode->i_ino) { |
1630 | ret = 0; | |
1631 | goto out; | |
1632 | } | |
236454df CM |
1633 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) { |
1634 | ret = 0; | |
1635 | goto out; | |
1636 | } | |
1637 | extent = btrfs_item_ptr(leaf, slot, | |
1638 | struct btrfs_file_extent_item); | |
1639 | found_type = btrfs_file_extent_type(extent); | |
1640 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
1641 | extent_end = key.offset + | |
1642 | (btrfs_file_extent_num_blocks(extent) << | |
1643 | inode->i_blkbits); | |
1644 | found_extent = 1; | |
1645 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
1646 | found_inline = 1; | |
1647 | extent_end = key.offset + | |
1648 | btrfs_file_extent_inline_len(leaf->items + slot); | |
1649 | } | |
1650 | ||
1651 | if (!found_extent && !found_inline) { | |
1652 | ret = 0; | |
a429e513 | 1653 | goto out; |
236454df CM |
1654 | } |
1655 | ||
1656 | if (search_start >= extent_end) { | |
1657 | ret = 0; | |
a429e513 | 1658 | goto out; |
236454df CM |
1659 | } |
1660 | ||
a429e513 | 1661 | search_start = extent_end; |
b18c6685 CM |
1662 | |
1663 | if (end < extent_end && end >= key.offset) { | |
236454df CM |
1664 | if (found_extent) { |
1665 | memcpy(&old, extent, sizeof(old)); | |
1666 | ret = btrfs_inc_extent_ref(trans, root, | |
1667 | btrfs_file_extent_disk_blocknr(&old), | |
1668 | btrfs_file_extent_disk_num_blocks(&old)); | |
1669 | BUG_ON(ret); | |
1670 | } | |
1671 | WARN_ON(found_inline); | |
b18c6685 CM |
1672 | bookend = 1; |
1673 | } | |
1674 | ||
1675 | if (start > key.offset) { | |
1676 | u64 new_num; | |
a429e513 | 1677 | u64 old_num; |
b18c6685 CM |
1678 | /* truncate existing extent */ |
1679 | keep = 1; | |
1680 | WARN_ON(start & (root->blocksize - 1)); | |
236454df CM |
1681 | if (found_extent) { |
1682 | new_num = (start - key.offset) >> | |
1683 | inode->i_blkbits; | |
1684 | old_num = btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1685 | *hint_block = |
1686 | btrfs_file_extent_disk_blocknr(extent); | |
236454df CM |
1687 | inode->i_blocks -= (old_num - new_num) << 3; |
1688 | btrfs_set_file_extent_num_blocks(extent, | |
1689 | new_num); | |
1690 | mark_buffer_dirty(path->nodes[0]); | |
1691 | } else { | |
1692 | WARN_ON(1); | |
236454df | 1693 | } |
b18c6685 CM |
1694 | } |
1695 | if (!keep) { | |
236454df CM |
1696 | u64 disk_blocknr = 0; |
1697 | u64 disk_num_blocks = 0; | |
1698 | u64 extent_num_blocks = 0; | |
1699 | if (found_extent) { | |
1700 | disk_blocknr = | |
1701 | btrfs_file_extent_disk_blocknr(extent); | |
1702 | disk_num_blocks = | |
1703 | btrfs_file_extent_disk_num_blocks(extent); | |
1704 | extent_num_blocks = | |
1705 | btrfs_file_extent_num_blocks(extent); | |
de428b63 CM |
1706 | *hint_block = |
1707 | btrfs_file_extent_disk_blocknr(extent); | |
236454df | 1708 | } |
b18c6685 CM |
1709 | ret = btrfs_del_item(trans, root, path); |
1710 | BUG_ON(ret); | |
1711 | btrfs_release_path(root, path); | |
098f59c2 | 1712 | extent = NULL; |
236454df | 1713 | if (found_extent) { |
098f59c2 | 1714 | inode->i_blocks -= extent_num_blocks << 3; |
236454df CM |
1715 | ret = btrfs_free_extent(trans, root, |
1716 | disk_blocknr, | |
1717 | disk_num_blocks, 0); | |
1718 | } | |
b18c6685 CM |
1719 | |
1720 | BUG_ON(ret); | |
1721 | if (!bookend && search_start >= end) { | |
1722 | ret = 0; | |
1723 | goto out; | |
1724 | } | |
1725 | if (!bookend) | |
a429e513 | 1726 | continue; |
b18c6685 | 1727 | } |
236454df | 1728 | if (bookend && found_extent) { |
b18c6685 CM |
1729 | /* create bookend */ |
1730 | struct btrfs_key ins; | |
b18c6685 CM |
1731 | ins.objectid = inode->i_ino; |
1732 | ins.offset = end; | |
1733 | ins.flags = 0; | |
1734 | btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY); | |
1735 | ||
1736 | btrfs_release_path(root, path); | |
b18c6685 CM |
1737 | ret = btrfs_insert_empty_item(trans, root, path, &ins, |
1738 | sizeof(*extent)); | |
1739 | BUG_ON(ret); | |
1740 | extent = btrfs_item_ptr( | |
1741 | btrfs_buffer_leaf(path->nodes[0]), | |
1742 | path->slots[0], | |
1743 | struct btrfs_file_extent_item); | |
1744 | btrfs_set_file_extent_disk_blocknr(extent, | |
1745 | btrfs_file_extent_disk_blocknr(&old)); | |
1746 | btrfs_set_file_extent_disk_num_blocks(extent, | |
1747 | btrfs_file_extent_disk_num_blocks(&old)); | |
1748 | ||
1749 | btrfs_set_file_extent_offset(extent, | |
1750 | btrfs_file_extent_offset(&old) + | |
1751 | ((end - key.offset) >> inode->i_blkbits)); | |
1752 | WARN_ON(btrfs_file_extent_num_blocks(&old) < | |
1753 | (end - key.offset) >> inode->i_blkbits); | |
1754 | btrfs_set_file_extent_num_blocks(extent, | |
1755 | btrfs_file_extent_num_blocks(&old) - | |
1756 | ((end - key.offset) >> inode->i_blkbits)); | |
1757 | ||
236454df CM |
1758 | btrfs_set_file_extent_type(extent, |
1759 | BTRFS_FILE_EXTENT_REG); | |
b18c6685 CM |
1760 | btrfs_set_file_extent_generation(extent, |
1761 | btrfs_file_extent_generation(&old)); | |
b18c6685 | 1762 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a429e513 CM |
1763 | inode->i_blocks += |
1764 | btrfs_file_extent_num_blocks(extent) << 3; | |
b18c6685 | 1765 | ret = 0; |
70b2befd | 1766 | goto out; |
b18c6685 | 1767 | } |
b18c6685 | 1768 | } |
b18c6685 | 1769 | out: |
b18c6685 CM |
1770 | btrfs_free_path(path); |
1771 | return ret; | |
1772 | } | |
1773 | ||
1774 | static int prepare_pages(struct btrfs_root *root, | |
75dfe396 CM |
1775 | struct file *file, |
1776 | struct page **pages, | |
1777 | size_t num_pages, | |
1778 | loff_t pos, | |
2932f3ec CM |
1779 | unsigned long first_index, |
1780 | unsigned long last_index, | |
6567e837 CM |
1781 | size_t write_bytes, |
1782 | u64 alloc_extent_start) | |
75dfe396 CM |
1783 | { |
1784 | int i; | |
1785 | unsigned long index = pos >> PAGE_CACHE_SHIFT; | |
1786 | struct inode *inode = file->f_path.dentry->d_inode; | |
1787 | int offset; | |
1788 | int err = 0; | |
75dfe396 | 1789 | int this_write; |
6567e837 CM |
1790 | struct buffer_head *bh; |
1791 | struct buffer_head *head; | |
75dfe396 CM |
1792 | loff_t isize = i_size_read(inode); |
1793 | ||
1794 | memset(pages, 0, num_pages * sizeof(struct page *)); | |
1795 | ||
1796 | for (i = 0; i < num_pages; i++) { | |
1797 | pages[i] = grab_cache_page(inode->i_mapping, index + i); | |
1798 | if (!pages[i]) { | |
1799 | err = -ENOMEM; | |
1800 | goto failed_release; | |
1801 | } | |
35b7e476 CM |
1802 | cancel_dirty_page(pages[i], PAGE_CACHE_SIZE); |
1803 | wait_on_page_writeback(pages[i]); | |
75dfe396 CM |
1804 | offset = pos & (PAGE_CACHE_SIZE -1); |
1805 | this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); | |
35b7e476 CM |
1806 | if (!page_has_buffers(pages[i])) { |
1807 | create_empty_buffers(pages[i], | |
1808 | root->fs_info->sb->s_blocksize, | |
1809 | (1 << BH_Uptodate)); | |
1810 | } | |
6567e837 CM |
1811 | head = page_buffers(pages[i]); |
1812 | bh = head; | |
1813 | do { | |
1814 | err = btrfs_map_bh_to_logical(root, bh, | |
1815 | alloc_extent_start); | |
1816 | BUG_ON(err); | |
1817 | if (err) | |
1818 | goto failed_truncate; | |
1819 | bh = bh->b_this_page; | |
236454df CM |
1820 | if (alloc_extent_start) |
1821 | alloc_extent_start++; | |
6567e837 | 1822 | } while (bh != head); |
75dfe396 | 1823 | pos += this_write; |
75dfe396 CM |
1824 | WARN_ON(this_write > write_bytes); |
1825 | write_bytes -= this_write; | |
1826 | } | |
1827 | return 0; | |
1828 | ||
1829 | failed_release: | |
1830 | btrfs_drop_pages(pages, num_pages); | |
1831 | return err; | |
1832 | ||
1833 | failed_truncate: | |
1834 | btrfs_drop_pages(pages, num_pages); | |
1835 | if (pos > isize) | |
1836 | vmtruncate(inode, isize); | |
1837 | return err; | |
1838 | } | |
1839 | ||
1840 | static ssize_t btrfs_file_write(struct file *file, const char __user *buf, | |
1841 | size_t count, loff_t *ppos) | |
1842 | { | |
1843 | loff_t pos; | |
1844 | size_t num_written = 0; | |
1845 | int err = 0; | |
1846 | int ret = 0; | |
75dfe396 | 1847 | struct inode *inode = file->f_path.dentry->d_inode; |
d6e4a428 | 1848 | struct btrfs_root *root = BTRFS_I(inode)->root; |
b18c6685 | 1849 | struct page *pages[8]; |
35b7e476 | 1850 | struct page *pinned[2]; |
2932f3ec CM |
1851 | unsigned long first_index; |
1852 | unsigned long last_index; | |
6567e837 CM |
1853 | u64 start_pos; |
1854 | u64 num_blocks; | |
1855 | u64 alloc_extent_start; | |
de428b63 | 1856 | u64 hint_block; |
6567e837 | 1857 | struct btrfs_trans_handle *trans; |
b18c6685 | 1858 | struct btrfs_key ins; |
35b7e476 CM |
1859 | pinned[0] = NULL; |
1860 | pinned[1] = NULL; | |
75dfe396 CM |
1861 | if (file->f_flags & O_DIRECT) |
1862 | return -EINVAL; | |
1863 | pos = *ppos; | |
75dfe396 CM |
1864 | vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
1865 | current->backing_dev_info = inode->i_mapping->backing_dev_info; | |
1866 | err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); | |
1867 | if (err) | |
1868 | goto out; | |
1869 | if (count == 0) | |
1870 | goto out; | |
1871 | err = remove_suid(file->f_path.dentry); | |
1872 | if (err) | |
1873 | goto out; | |
1874 | file_update_time(file); | |
a429e513 CM |
1875 | |
1876 | start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); | |
1877 | num_blocks = (count + pos - start_pos + root->blocksize - 1) >> | |
1878 | inode->i_blkbits; | |
1879 | ||
75dfe396 | 1880 | mutex_lock(&inode->i_mutex); |
2932f3ec CM |
1881 | first_index = pos >> PAGE_CACHE_SHIFT; |
1882 | last_index = (pos + count) >> PAGE_CACHE_SHIFT; | |
6567e837 | 1883 | |
a429e513 CM |
1884 | if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && |
1885 | (pos & (PAGE_CACHE_SIZE - 1))) { | |
1886 | pinned[0] = grab_cache_page(inode->i_mapping, first_index); | |
1887 | if (!PageUptodate(pinned[0])) { | |
1888 | ret = mpage_readpage(pinned[0], btrfs_get_block); | |
1889 | BUG_ON(ret); | |
35b7e476 | 1890 | wait_on_page_locked(pinned[0]); |
a429e513 CM |
1891 | } else { |
1892 | unlock_page(pinned[0]); | |
1893 | } | |
1894 | } | |
1895 | if (first_index != last_index && | |
1896 | (last_index << PAGE_CACHE_SHIFT) < inode->i_size && | |
de428b63 | 1897 | pos + count < inode->i_size && |
a429e513 CM |
1898 | (count & (PAGE_CACHE_SIZE - 1))) { |
1899 | pinned[1] = grab_cache_page(inode->i_mapping, last_index); | |
1900 | if (!PageUptodate(pinned[1])) { | |
1901 | ret = mpage_readpage(pinned[1], btrfs_get_block); | |
1902 | BUG_ON(ret); | |
35b7e476 | 1903 | wait_on_page_locked(pinned[1]); |
a429e513 CM |
1904 | } else { |
1905 | unlock_page(pinned[1]); | |
1906 | } | |
1907 | } | |
1908 | ||
6567e837 CM |
1909 | mutex_lock(&root->fs_info->fs_mutex); |
1910 | trans = btrfs_start_transaction(root, 1); | |
1911 | if (!trans) { | |
1912 | err = -ENOMEM; | |
b18c6685 | 1913 | mutex_unlock(&root->fs_info->fs_mutex); |
6567e837 CM |
1914 | goto out_unlock; |
1915 | } | |
31f3c99b | 1916 | btrfs_set_trans_block_group(trans, inode); |
a429e513 CM |
1917 | /* FIXME blocksize != 4096 */ |
1918 | inode->i_blocks += num_blocks << 3; | |
de428b63 | 1919 | hint_block = 0; |
b18c6685 | 1920 | if (start_pos < inode->i_size) { |
a429e513 | 1921 | /* FIXME blocksize != pagesize */ |
b18c6685 CM |
1922 | ret = drop_extents(trans, root, inode, |
1923 | start_pos, | |
1924 | (pos + count + root->blocksize -1) & | |
de428b63 | 1925 | ~((u64)root->blocksize - 1), &hint_block); |
236454df | 1926 | BUG_ON(ret); |
b18c6685 | 1927 | } |
236454df CM |
1928 | if (inode->i_size >= PAGE_CACHE_SIZE || pos + count < inode->i_size || |
1929 | pos + count - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) { | |
4d775673 | 1930 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, |
de428b63 CM |
1931 | num_blocks, hint_block, (u64)-1, |
1932 | &ins, 1); | |
236454df CM |
1933 | BUG_ON(ret); |
1934 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
b18c6685 | 1935 | start_pos, ins.objectid, ins.offset); |
236454df CM |
1936 | BUG_ON(ret); |
1937 | } else { | |
1938 | ins.offset = 0; | |
1939 | ins.objectid = 0; | |
1940 | } | |
6567e837 | 1941 | BUG_ON(ret); |
b18c6685 | 1942 | alloc_extent_start = ins.objectid; |
e37c9e69 | 1943 | // btrfs_update_inode_block_group(trans, inode); |
b18c6685 | 1944 | ret = btrfs_end_transaction(trans, root); |
6567e837 CM |
1945 | mutex_unlock(&root->fs_info->fs_mutex); |
1946 | ||
75dfe396 CM |
1947 | while(count > 0) { |
1948 | size_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
1949 | size_t write_bytes = min(count, PAGE_CACHE_SIZE - offset); | |
1950 | size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >> | |
1951 | PAGE_CACHE_SHIFT; | |
b18c6685 CM |
1952 | |
1953 | memset(pages, 0, sizeof(pages)); | |
1954 | ret = prepare_pages(root, file, pages, num_pages, | |
6567e837 CM |
1955 | pos, first_index, last_index, |
1956 | write_bytes, alloc_extent_start); | |
75dfe396 | 1957 | BUG_ON(ret); |
b18c6685 | 1958 | |
6567e837 | 1959 | /* FIXME blocks != pagesize */ |
236454df CM |
1960 | if (alloc_extent_start) |
1961 | alloc_extent_start += num_pages; | |
75dfe396 CM |
1962 | ret = btrfs_copy_from_user(pos, num_pages, |
1963 | write_bytes, pages, buf); | |
1964 | BUG_ON(ret); | |
1965 | ||
f254e52c | 1966 | ret = dirty_and_release_pages(NULL, root, file, pages, |
70b2befd | 1967 | num_pages, pos, write_bytes); |
75dfe396 CM |
1968 | BUG_ON(ret); |
1969 | btrfs_drop_pages(pages, num_pages); | |
1970 | ||
75dfe396 CM |
1971 | buf += write_bytes; |
1972 | count -= write_bytes; | |
1973 | pos += write_bytes; | |
1974 | num_written += write_bytes; | |
1975 | ||
1976 | balance_dirty_pages_ratelimited(inode->i_mapping); | |
35b7e476 | 1977 | btrfs_btree_balance_dirty(root); |
75dfe396 CM |
1978 | cond_resched(); |
1979 | } | |
6567e837 | 1980 | out_unlock: |
75dfe396 CM |
1981 | mutex_unlock(&inode->i_mutex); |
1982 | out: | |
a429e513 CM |
1983 | if (pinned[0]) |
1984 | page_cache_release(pinned[0]); | |
1985 | if (pinned[1]) | |
1986 | page_cache_release(pinned[1]); | |
75dfe396 CM |
1987 | *ppos = pos; |
1988 | current->backing_dev_info = NULL; | |
a429e513 | 1989 | mark_inode_dirty(inode); |
75dfe396 CM |
1990 | return num_written ? num_written : err; |
1991 | } | |
1992 | ||
f254e52c CM |
1993 | static int btrfs_read_actor(read_descriptor_t *desc, struct page *page, |
1994 | unsigned long offset, unsigned long size) | |
1995 | { | |
1996 | char *kaddr; | |
1997 | unsigned long left, count = desc->count; | |
d6e4a428 | 1998 | struct inode *inode = page->mapping->host; |
f254e52c CM |
1999 | |
2000 | if (size > count) | |
2001 | size = count; | |
2002 | ||
2003 | if (!PageChecked(page)) { | |
2004 | /* FIXME, do it per block */ | |
d6e4a428 | 2005 | struct btrfs_root *root = BTRFS_I(inode)->root; |
236454df | 2006 | |
f254e52c | 2007 | int ret = btrfs_csum_verify_file_block(root, |
236454df CM |
2008 | page->mapping->host->i_ino, |
2009 | page->index << PAGE_CACHE_SHIFT, | |
2010 | kmap(page), PAGE_CACHE_SIZE); | |
f254e52c CM |
2011 | if (ret) { |
2012 | printk("failed to verify ino %lu page %lu\n", | |
2013 | page->mapping->host->i_ino, | |
2014 | page->index); | |
2015 | memset(page_address(page), 0, PAGE_CACHE_SIZE); | |
2016 | } | |
2017 | SetPageChecked(page); | |
2018 | kunmap(page); | |
2019 | } | |
2020 | /* | |
2021 | * Faults on the destination of a read are common, so do it before | |
2022 | * taking the kmap. | |
2023 | */ | |
2024 | if (!fault_in_pages_writeable(desc->arg.buf, size)) { | |
2025 | kaddr = kmap_atomic(page, KM_USER0); | |
2026 | left = __copy_to_user_inatomic(desc->arg.buf, | |
2027 | kaddr + offset, size); | |
2028 | kunmap_atomic(kaddr, KM_USER0); | |
2029 | if (left == 0) | |
2030 | goto success; | |
2031 | } | |
2032 | ||
2033 | /* Do it the slow way */ | |
2034 | kaddr = kmap(page); | |
2035 | left = __copy_to_user(desc->arg.buf, kaddr + offset, size); | |
2036 | kunmap(page); | |
2037 | ||
2038 | if (left) { | |
2039 | size -= left; | |
2040 | desc->error = -EFAULT; | |
2041 | } | |
2042 | success: | |
2043 | desc->count = count - size; | |
2044 | desc->written += size; | |
2045 | desc->arg.buf += size; | |
2046 | return size; | |
2047 | } | |
2048 | ||
2049 | /** | |
2050 | * btrfs_file_aio_read - filesystem read routine | |
2051 | * @iocb: kernel I/O control block | |
2052 | * @iov: io vector request | |
2053 | * @nr_segs: number of segments in the iovec | |
2054 | * @pos: current file position | |
2055 | */ | |
2056 | static ssize_t btrfs_file_aio_read(struct kiocb *iocb, const struct iovec *iov, | |
2057 | unsigned long nr_segs, loff_t pos) | |
2058 | { | |
2059 | struct file *filp = iocb->ki_filp; | |
2060 | ssize_t retval; | |
2061 | unsigned long seg; | |
2062 | size_t count; | |
2063 | loff_t *ppos = &iocb->ki_pos; | |
2064 | ||
2065 | count = 0; | |
2066 | for (seg = 0; seg < nr_segs; seg++) { | |
2067 | const struct iovec *iv = &iov[seg]; | |
2068 | ||
2069 | /* | |
2070 | * If any segment has a negative length, or the cumulative | |
2071 | * length ever wraps negative then return -EINVAL. | |
2072 | */ | |
2073 | count += iv->iov_len; | |
2074 | if (unlikely((ssize_t)(count|iv->iov_len) < 0)) | |
2075 | return -EINVAL; | |
2076 | if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) | |
2077 | continue; | |
2078 | if (seg == 0) | |
2079 | return -EFAULT; | |
2080 | nr_segs = seg; | |
2081 | count -= iv->iov_len; /* This segment is no good */ | |
2082 | break; | |
2083 | } | |
2084 | retval = 0; | |
2085 | if (count) { | |
2086 | for (seg = 0; seg < nr_segs; seg++) { | |
2087 | read_descriptor_t desc; | |
2088 | ||
2089 | desc.written = 0; | |
2090 | desc.arg.buf = iov[seg].iov_base; | |
2091 | desc.count = iov[seg].iov_len; | |
2092 | if (desc.count == 0) | |
2093 | continue; | |
2094 | desc.error = 0; | |
2095 | do_generic_file_read(filp, ppos, &desc, | |
2096 | btrfs_read_actor); | |
2097 | retval += desc.written; | |
2098 | if (desc.error) { | |
2099 | retval = retval ?: desc.error; | |
2100 | break; | |
2101 | } | |
2102 | } | |
2103 | } | |
2104 | return retval; | |
2105 | } | |
2106 | ||
2619ba1f CM |
2107 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) |
2108 | { | |
2109 | struct btrfs_trans_handle *trans; | |
2110 | struct btrfs_key key; | |
2111 | struct btrfs_root_item root_item; | |
2112 | struct btrfs_inode_item *inode_item; | |
2113 | struct buffer_head *subvol; | |
2114 | struct btrfs_leaf *leaf; | |
2115 | struct btrfs_root *new_root; | |
2116 | struct inode *inode; | |
31f3c99b | 2117 | struct inode *dir; |
2619ba1f CM |
2118 | int ret; |
2119 | u64 objectid; | |
2120 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
2121 | ||
2122 | mutex_lock(&root->fs_info->fs_mutex); | |
2123 | trans = btrfs_start_transaction(root, 1); | |
2124 | BUG_ON(!trans); | |
2125 | ||
31f3c99b | 2126 | subvol = btrfs_alloc_free_block(trans, root, 0); |
5e82849e CM |
2127 | if (subvol == NULL) |
2128 | return -ENOSPC; | |
2619ba1f CM |
2129 | leaf = btrfs_buffer_leaf(subvol); |
2130 | btrfs_set_header_nritems(&leaf->header, 0); | |
2131 | btrfs_set_header_level(&leaf->header, 0); | |
7eccb903 | 2132 | btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol)); |
2619ba1f | 2133 | btrfs_set_header_generation(&leaf->header, trans->transid); |
4d775673 | 2134 | btrfs_set_header_owner(&leaf->header, root->root_key.objectid); |
2619ba1f CM |
2135 | memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid, |
2136 | sizeof(leaf->header.fsid)); | |
4d775673 | 2137 | mark_buffer_dirty(subvol); |
2619ba1f CM |
2138 | |
2139 | inode_item = &root_item.inode; | |
2140 | memset(inode_item, 0, sizeof(*inode_item)); | |
2141 | btrfs_set_inode_generation(inode_item, 1); | |
2142 | btrfs_set_inode_size(inode_item, 3); | |
2143 | btrfs_set_inode_nlink(inode_item, 1); | |
2144 | btrfs_set_inode_nblocks(inode_item, 1); | |
2145 | btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); | |
2146 | ||
7eccb903 | 2147 | btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol)); |
2619ba1f | 2148 | btrfs_set_root_refs(&root_item, 1); |
5e82849e CM |
2149 | brelse(subvol); |
2150 | subvol = NULL; | |
2619ba1f | 2151 | |
2619ba1f CM |
2152 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2153 | 0, &objectid); | |
2154 | BUG_ON(ret); | |
2155 | ||
2156 | btrfs_set_root_dirid(&root_item, new_dirid); | |
2157 | ||
2158 | key.objectid = objectid; | |
2159 | key.offset = 1; | |
2160 | key.flags = 0; | |
2161 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
2162 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2163 | &root_item); | |
2164 | BUG_ON(ret); | |
2165 | ||
2166 | /* | |
2167 | * insert the directory item | |
2168 | */ | |
2169 | key.offset = (u64)-1; | |
31f3c99b | 2170 | dir = root->fs_info->sb->s_root->d_inode; |
2619ba1f | 2171 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
31f3c99b | 2172 | name, namelen, dir->i_ino, &key, 0); |
2619ba1f CM |
2173 | BUG_ON(ret); |
2174 | ||
2175 | ret = btrfs_commit_transaction(trans, root); | |
2176 | BUG_ON(ret); | |
2177 | ||
2178 | new_root = btrfs_read_fs_root(root->fs_info, &key); | |
2179 | BUG_ON(!new_root); | |
2180 | ||
2181 | trans = btrfs_start_transaction(new_root, 1); | |
2182 | BUG_ON(!trans); | |
2183 | ||
31f3c99b CM |
2184 | inode = btrfs_new_inode(trans, new_root, new_dirid, |
2185 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
2619ba1f CM |
2186 | inode->i_op = &btrfs_dir_inode_operations; |
2187 | inode->i_fop = &btrfs_dir_file_operations; | |
2188 | ||
2189 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
2190 | BUG_ON(ret); | |
2191 | ||
2192 | inode->i_nlink = 1; | |
2193 | inode->i_size = 6; | |
2194 | ret = btrfs_update_inode(trans, new_root, inode); | |
2195 | BUG_ON(ret); | |
2196 | ||
2197 | ret = btrfs_commit_transaction(trans, new_root); | |
2198 | BUG_ON(ret); | |
2199 | ||
2200 | iput(inode); | |
2201 | ||
2202 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2203 | btrfs_btree_balance_dirty(root); |
2619ba1f CM |
2204 | return 0; |
2205 | } | |
2206 | ||
c5739bba CM |
2207 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) |
2208 | { | |
2209 | struct btrfs_trans_handle *trans; | |
2210 | struct btrfs_key key; | |
2211 | struct btrfs_root_item new_root_item; | |
2212 | int ret; | |
2213 | u64 objectid; | |
2214 | ||
2619ba1f CM |
2215 | if (!root->ref_cows) |
2216 | return -EINVAL; | |
2217 | ||
c5739bba CM |
2218 | mutex_lock(&root->fs_info->fs_mutex); |
2219 | trans = btrfs_start_transaction(root, 1); | |
2220 | BUG_ON(!trans); | |
2221 | ||
2222 | ret = btrfs_update_inode(trans, root, root->inode); | |
2223 | BUG_ON(ret); | |
2224 | ||
1b05da2e CM |
2225 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2226 | 0, &objectid); | |
c5739bba CM |
2227 | BUG_ON(ret); |
2228 | ||
c5739bba CM |
2229 | memcpy(&new_root_item, &root->root_item, |
2230 | sizeof(new_root_item)); | |
2231 | ||
c5739bba CM |
2232 | key.objectid = objectid; |
2233 | key.offset = 1; | |
2234 | key.flags = 0; | |
2235 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
7eccb903 | 2236 | btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node)); |
c5739bba CM |
2237 | |
2238 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2239 | &new_root_item); | |
2240 | BUG_ON(ret); | |
2241 | ||
c5739bba CM |
2242 | /* |
2243 | * insert the directory item | |
2244 | */ | |
2245 | key.offset = (u64)-1; | |
2246 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2247 | name, namelen, | |
2248 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2249 | &key, 0); | |
2250 | ||
2251 | BUG_ON(ret); | |
2252 | ||
2253 | ret = btrfs_inc_root_ref(trans, root); | |
2254 | BUG_ON(ret); | |
2255 | ||
2256 | ret = btrfs_commit_transaction(trans, root); | |
2257 | BUG_ON(ret); | |
2258 | mutex_unlock(&root->fs_info->fs_mutex); | |
35b7e476 | 2259 | btrfs_btree_balance_dirty(root); |
c5739bba CM |
2260 | return 0; |
2261 | } | |
2262 | ||
8352d8a4 CM |
2263 | static int add_disk(struct btrfs_root *root, char *name, int namelen) |
2264 | { | |
2265 | struct block_device *bdev; | |
2266 | struct btrfs_path *path; | |
2267 | struct super_block *sb = root->fs_info->sb; | |
2268 | struct btrfs_root *dev_root = root->fs_info->dev_root; | |
2269 | struct btrfs_trans_handle *trans; | |
2270 | struct btrfs_device_item *dev_item; | |
2271 | struct btrfs_key key; | |
2272 | u16 item_size; | |
2273 | u64 num_blocks; | |
2274 | u64 new_blocks; | |
b4100d64 | 2275 | u64 device_id; |
8352d8a4 | 2276 | int ret; |
b4100d64 | 2277 | |
8352d8a4 CM |
2278 | printk("adding disk %s\n", name); |
2279 | path = btrfs_alloc_path(); | |
2280 | if (!path) | |
2281 | return -ENOMEM; | |
2282 | num_blocks = btrfs_super_total_blocks(root->fs_info->disk_super); | |
2283 | bdev = open_bdev_excl(name, O_RDWR, sb); | |
2284 | if (IS_ERR(bdev)) { | |
2285 | ret = PTR_ERR(bdev); | |
2286 | printk("open bdev excl failed ret %d\n", ret); | |
2287 | goto out_nolock; | |
2288 | } | |
2289 | set_blocksize(bdev, sb->s_blocksize); | |
2290 | new_blocks = bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
2291 | key.objectid = num_blocks; | |
2292 | key.offset = new_blocks; | |
2293 | key.flags = 0; | |
2294 | btrfs_set_key_type(&key, BTRFS_DEV_ITEM_KEY); | |
2295 | ||
2296 | mutex_lock(&dev_root->fs_info->fs_mutex); | |
2297 | trans = btrfs_start_transaction(dev_root, 1); | |
2298 | item_size = sizeof(*dev_item) + namelen; | |
2299 | printk("insert empty on %Lu %Lu %u size %d\n", num_blocks, new_blocks, key.flags, item_size); | |
2300 | ret = btrfs_insert_empty_item(trans, dev_root, path, &key, item_size); | |
2301 | if (ret) { | |
2302 | printk("insert failed %d\n", ret); | |
2303 | close_bdev_excl(bdev); | |
2304 | if (ret > 0) | |
2305 | ret = -EEXIST; | |
2306 | goto out; | |
2307 | } | |
2308 | dev_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), | |
2309 | path->slots[0], struct btrfs_device_item); | |
2310 | btrfs_set_device_pathlen(dev_item, namelen); | |
2311 | memcpy(dev_item + 1, name, namelen); | |
b4100d64 CM |
2312 | |
2313 | device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1; | |
2314 | btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id); | |
2315 | btrfs_set_device_id(dev_item, device_id); | |
8352d8a4 CM |
2316 | mark_buffer_dirty(path->nodes[0]); |
2317 | ||
b4100d64 CM |
2318 | ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks, |
2319 | new_blocks); | |
8352d8a4 CM |
2320 | |
2321 | if (!ret) { | |
2322 | btrfs_set_super_total_blocks(root->fs_info->disk_super, | |
2323 | num_blocks + new_blocks); | |
2324 | i_size_write(root->fs_info->btree_inode, | |
2325 | (num_blocks + new_blocks) << | |
2326 | root->fs_info->btree_inode->i_blkbits); | |
2327 | } | |
2328 | ||
2329 | out: | |
2330 | ret = btrfs_commit_transaction(trans, dev_root); | |
2331 | BUG_ON(ret); | |
2332 | mutex_unlock(&root->fs_info->fs_mutex); | |
2333 | out_nolock: | |
2334 | btrfs_free_path(path); | |
35b7e476 | 2335 | btrfs_btree_balance_dirty(root); |
8352d8a4 CM |
2336 | |
2337 | return ret; | |
2338 | } | |
2339 | ||
c5739bba CM |
2340 | static int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int |
2341 | cmd, unsigned long arg) | |
2342 | { | |
2343 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2344 | struct btrfs_ioctl_vol_args vol_args; | |
8352d8a4 | 2345 | int ret = 0; |
7e38180e | 2346 | struct btrfs_dir_item *di; |
c5739bba | 2347 | int namelen; |
2619ba1f CM |
2348 | struct btrfs_path *path; |
2349 | u64 root_dirid; | |
c5739bba | 2350 | |
c5739bba CM |
2351 | switch (cmd) { |
2352 | case BTRFS_IOC_SNAP_CREATE: | |
2353 | if (copy_from_user(&vol_args, | |
2354 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2355 | sizeof(vol_args))) | |
2356 | return -EFAULT; | |
2357 | namelen = strlen(vol_args.name); | |
2358 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2359 | return -EINVAL; | |
2619ba1f CM |
2360 | path = btrfs_alloc_path(); |
2361 | if (!path) | |
2362 | return -ENOMEM; | |
2d13d8d0 | 2363 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, |
2619ba1f | 2364 | mutex_lock(&root->fs_info->fs_mutex); |
7e38180e | 2365 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, |
2619ba1f CM |
2366 | path, root_dirid, |
2367 | vol_args.name, namelen, 0); | |
2368 | mutex_unlock(&root->fs_info->fs_mutex); | |
2d13d8d0 | 2369 | btrfs_free_path(path); |
7e38180e | 2370 | if (di && !IS_ERR(di)) |
2619ba1f CM |
2371 | return -EEXIST; |
2372 | ||
2373 | if (root == root->fs_info->tree_root) | |
2374 | ret = create_subvol(root, vol_args.name, namelen); | |
2375 | else | |
2376 | ret = create_snapshot(root, vol_args.name, namelen); | |
c5739bba CM |
2377 | WARN_ON(ret); |
2378 | break; | |
8352d8a4 CM |
2379 | case BTRFS_IOC_ADD_DISK: |
2380 | if (copy_from_user(&vol_args, | |
2381 | (struct btrfs_ioctl_vol_args __user *)arg, | |
2382 | sizeof(vol_args))) | |
2383 | return -EFAULT; | |
2384 | namelen = strlen(vol_args.name); | |
2385 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2386 | return -EINVAL; | |
2387 | vol_args.name[namelen] = '\0'; | |
2388 | ret = add_disk(root, vol_args.name, namelen); | |
2389 | break; | |
c5739bba CM |
2390 | default: |
2391 | return -ENOTTY; | |
2392 | } | |
8352d8a4 | 2393 | return ret; |
c5739bba CM |
2394 | } |
2395 | ||
2c90e5d6 CM |
2396 | static struct kmem_cache *btrfs_inode_cachep; |
2397 | struct kmem_cache *btrfs_trans_handle_cachep; | |
2398 | struct kmem_cache *btrfs_transaction_cachep; | |
2399 | struct kmem_cache *btrfs_bit_radix_cachep; | |
2400 | struct kmem_cache *btrfs_path_cachep; | |
2401 | ||
2402 | /* | |
2403 | * Called inside transaction, so use GFP_NOFS | |
2404 | */ | |
2405 | static struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2406 | { | |
2407 | struct btrfs_inode *ei; | |
2408 | ||
2409 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2410 | if (!ei) | |
2411 | return NULL; | |
2c90e5d6 CM |
2412 | return &ei->vfs_inode; |
2413 | } | |
2414 | ||
2415 | static void btrfs_destroy_inode(struct inode *inode) | |
2416 | { | |
2c90e5d6 | 2417 | WARN_ON(!list_empty(&inode->i_dentry)); |
2c90e5d6 CM |
2418 | WARN_ON(inode->i_data.nrpages); |
2419 | ||
2c90e5d6 CM |
2420 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2421 | } | |
2422 | ||
2423 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2424 | unsigned long flags) | |
2425 | { | |
2426 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2427 | ||
f9f3c6b6 | 2428 | if ((flags & (SLAB_CTOR_CONSTRUCTOR)) == |
2c90e5d6 CM |
2429 | SLAB_CTOR_CONSTRUCTOR) { |
2430 | inode_init_once(&ei->vfs_inode); | |
2431 | } | |
2432 | } | |
2433 | ||
2434 | static int init_inodecache(void) | |
2435 | { | |
2436 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", | |
2437 | sizeof(struct btrfs_inode), | |
2438 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2439 | SLAB_MEM_SPREAD), | |
2440 | init_once, NULL); | |
2441 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", | |
2442 | sizeof(struct btrfs_trans_handle), | |
2443 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2444 | SLAB_MEM_SPREAD), | |
2445 | NULL, NULL); | |
2446 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", | |
2447 | sizeof(struct btrfs_transaction), | |
2448 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2449 | SLAB_MEM_SPREAD), | |
2450 | NULL, NULL); | |
2451 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", | |
2452 | sizeof(struct btrfs_transaction), | |
2453 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2454 | SLAB_MEM_SPREAD), | |
2455 | NULL, NULL); | |
2456 | btrfs_bit_radix_cachep = kmem_cache_create("btrfs_radix", | |
2457 | 256, | |
2458 | 0, (SLAB_RECLAIM_ACCOUNT| | |
2459 | SLAB_MEM_SPREAD | | |
2460 | SLAB_DESTROY_BY_RCU), | |
2461 | NULL, NULL); | |
2462 | if (btrfs_inode_cachep == NULL || btrfs_trans_handle_cachep == NULL || | |
2463 | btrfs_transaction_cachep == NULL || btrfs_bit_radix_cachep == NULL) | |
2464 | return -ENOMEM; | |
2465 | return 0; | |
2466 | } | |
2467 | ||
2468 | static void destroy_inodecache(void) | |
2469 | { | |
2470 | kmem_cache_destroy(btrfs_inode_cachep); | |
2471 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2472 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2473 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2474 | kmem_cache_destroy(btrfs_path_cachep); | |
2475 | } | |
2476 | ||
2e635a27 CM |
2477 | static int btrfs_get_sb(struct file_system_type *fs_type, |
2478 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
2479 | { | |
2480 | return get_sb_bdev(fs_type, flags, dev_name, data, | |
2481 | btrfs_fill_super, mnt); | |
2482 | } | |
2483 | ||
236454df CM |
2484 | static int btrfs_getattr(struct vfsmount *mnt, |
2485 | struct dentry *dentry, struct kstat *stat) | |
2486 | { | |
2487 | struct inode *inode = dentry->d_inode; | |
2488 | generic_fillattr(inode, stat); | |
2489 | stat->blksize = 256 * 1024; | |
2490 | return 0; | |
2491 | } | |
2492 | ||
8fd17795 CM |
2493 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
2494 | { | |
2495 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
2496 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; | |
2497 | ||
2498 | buf->f_namelen = BTRFS_NAME_LEN; | |
2499 | buf->f_blocks = btrfs_super_total_blocks(disk_super); | |
2500 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); | |
2501 | buf->f_bavail = buf->f_bfree; | |
2502 | buf->f_bsize = dentry->d_sb->s_blocksize; | |
2503 | buf->f_type = BTRFS_SUPER_MAGIC; | |
2504 | return 0; | |
2505 | } | |
b5133862 | 2506 | |
2e635a27 CM |
2507 | static struct file_system_type btrfs_fs_type = { |
2508 | .owner = THIS_MODULE, | |
2509 | .name = "btrfs", | |
2510 | .get_sb = btrfs_get_sb, | |
2511 | .kill_sb = kill_block_super, | |
2512 | .fs_flags = FS_REQUIRES_DEV, | |
2513 | }; | |
2514 | ||
e20d96d6 | 2515 | static struct super_operations btrfs_super_ops = { |
134e9731 | 2516 | .delete_inode = btrfs_delete_inode, |
e20d96d6 CM |
2517 | .put_super = btrfs_put_super, |
2518 | .read_inode = btrfs_read_locked_inode, | |
d5719762 CM |
2519 | .write_super = btrfs_write_super, |
2520 | .sync_fs = btrfs_sync_fs, | |
4730a4bc | 2521 | .write_inode = btrfs_write_inode, |
b5133862 | 2522 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
2523 | .alloc_inode = btrfs_alloc_inode, |
2524 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 2525 | .statfs = btrfs_statfs, |
e20d96d6 CM |
2526 | }; |
2527 | ||
2528 | static struct inode_operations btrfs_dir_inode_operations = { | |
2529 | .lookup = btrfs_lookup, | |
d5719762 | 2530 | .create = btrfs_create, |
134e9731 | 2531 | .unlink = btrfs_unlink, |
f7922033 | 2532 | .mkdir = btrfs_mkdir, |
5f443fd2 | 2533 | .rmdir = btrfs_rmdir, |
e20d96d6 CM |
2534 | }; |
2535 | ||
d6e4a428 CM |
2536 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2537 | .lookup = btrfs_lookup, | |
2538 | }; | |
2539 | ||
e20d96d6 CM |
2540 | static struct file_operations btrfs_dir_file_operations = { |
2541 | .llseek = generic_file_llseek, | |
2542 | .read = generic_read_dir, | |
2543 | .readdir = btrfs_readdir, | |
c5739bba | 2544 | .ioctl = btrfs_ioctl, |
e20d96d6 CM |
2545 | }; |
2546 | ||
dee26a9f CM |
2547 | static struct address_space_operations btrfs_aops = { |
2548 | .readpage = btrfs_readpage, | |
dee26a9f CM |
2549 | .writepage = btrfs_writepage, |
2550 | .sync_page = block_sync_page, | |
2551 | .prepare_write = btrfs_prepare_write, | |
75dfe396 | 2552 | .commit_write = btrfs_commit_write, |
dee26a9f CM |
2553 | }; |
2554 | ||
2555 | static struct inode_operations btrfs_file_inode_operations = { | |
f4b9aa8d | 2556 | .truncate = btrfs_truncate, |
236454df | 2557 | .getattr = btrfs_getattr, |
dee26a9f CM |
2558 | }; |
2559 | ||
2560 | static struct file_operations btrfs_file_operations = { | |
2561 | .llseek = generic_file_llseek, | |
2562 | .read = do_sync_read, | |
e8f05c45 CM |
2563 | .aio_read = btrfs_file_aio_read, |
2564 | .write = btrfs_file_write, | |
dee26a9f CM |
2565 | .mmap = generic_file_mmap, |
2566 | .open = generic_file_open, | |
c5739bba | 2567 | .ioctl = btrfs_ioctl, |
8fd17795 | 2568 | .fsync = btrfs_sync_file, |
dee26a9f | 2569 | }; |
e20d96d6 | 2570 | |
2e635a27 CM |
2571 | static int __init init_btrfs_fs(void) |
2572 | { | |
2c90e5d6 | 2573 | int err; |
2e635a27 | 2574 | printk("btrfs loaded!\n"); |
2c90e5d6 CM |
2575 | err = init_inodecache(); |
2576 | if (err) | |
2577 | return err; | |
2e635a27 | 2578 | return register_filesystem(&btrfs_fs_type); |
d6e4a428 CM |
2579 | destroy_inodecache(); |
2580 | return err; | |
2e635a27 CM |
2581 | } |
2582 | ||
2583 | static void __exit exit_btrfs_fs(void) | |
2584 | { | |
2c90e5d6 | 2585 | destroy_inodecache(); |
2e635a27 CM |
2586 | unregister_filesystem(&btrfs_fs_type); |
2587 | printk("btrfs unloaded\n"); | |
2588 | } | |
2589 | ||
2590 | module_init(init_btrfs_fs) | |
2591 | module_exit(exit_btrfs_fs) | |
2592 | ||
2593 | MODULE_LICENSE("GPL"); |