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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 56 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
57 | |
58 | static struct kmem_cache *btrfs_inode_cachep; | |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | |
60 | struct kmem_cache *btrfs_transaction_cachep; | |
61 | struct kmem_cache *btrfs_bit_radix_cachep; | |
62 | struct kmem_cache *btrfs_path_cachep; | |
63 | ||
64 | #define S_SHIFT 12 | |
65 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
66 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
67 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
68 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
69 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
70 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
71 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
72 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
73 | }; | |
74 | ||
b888db2b CM |
75 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) |
76 | { | |
77 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
78 | struct btrfs_trans_handle *trans; | |
79 | struct btrfs_key ins; | |
80 | u64 alloc_hint = 0; | |
db94535d | 81 | u64 num_bytes; |
b888db2b | 82 | int ret; |
db94535d | 83 | u64 blocksize = root->sectorsize; |
b888db2b CM |
84 | |
85 | mutex_lock(&root->fs_info->fs_mutex); | |
86 | trans = btrfs_start_transaction(root, 1); | |
87 | btrfs_set_trans_block_group(trans, inode); | |
88 | BUG_ON(!trans); | |
db94535d | 89 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
b888db2b | 90 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 91 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 92 | |
179e29e4 CM |
93 | if (alloc_hint == EXTENT_MAP_INLINE) |
94 | goto out; | |
95 | ||
7bb86316 CM |
96 | ret = btrfs_alloc_extent(trans, root, num_bytes, |
97 | root->root_key.objectid, trans->transid, | |
98 | inode->i_ino, start, 0, | |
b888db2b CM |
99 | alloc_hint, (u64)-1, &ins, 1); |
100 | if (ret) { | |
101 | WARN_ON(1); | |
102 | goto out; | |
103 | } | |
104 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
105 | start, ins.objectid, ins.offset, | |
106 | ins.offset); | |
107 | out: | |
108 | btrfs_end_transaction(trans, root); | |
109 | mutex_unlock(&root->fs_info->fs_mutex); | |
110 | return ret; | |
111 | } | |
112 | ||
07157aac CM |
113 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
114 | { | |
115 | struct inode *inode = page->mapping->host; | |
116 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
117 | struct btrfs_trans_handle *trans; | |
118 | char *kaddr; | |
b6cda9bc | 119 | int ret = 0; |
35ebb934 | 120 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
121 | size_t offset = start - page_start; |
122 | ||
b6cda9bc CM |
123 | if (btrfs_test_opt(root, NODATASUM)) |
124 | return 0; | |
125 | ||
07157aac CM |
126 | mutex_lock(&root->fs_info->fs_mutex); |
127 | trans = btrfs_start_transaction(root, 1); | |
128 | btrfs_set_trans_block_group(trans, inode); | |
129 | kaddr = kmap(page); | |
f578d4bd | 130 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
131 | start, kaddr + offset, end - start + 1); |
132 | kunmap(page); | |
133 | ret = btrfs_end_transaction(trans, root); | |
134 | BUG_ON(ret); | |
135 | mutex_unlock(&root->fs_info->fs_mutex); | |
136 | return ret; | |
137 | } | |
138 | ||
139 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
140 | { | |
141 | int ret = 0; | |
142 | struct inode *inode = page->mapping->host; | |
143 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
144 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
145 | struct btrfs_csum_item *item; | |
146 | struct btrfs_path *path = NULL; | |
ff79f819 | 147 | u32 csum; |
07157aac | 148 | |
b6cda9bc CM |
149 | if (btrfs_test_opt(root, NODATASUM)) |
150 | return 0; | |
151 | ||
07157aac CM |
152 | mutex_lock(&root->fs_info->fs_mutex); |
153 | path = btrfs_alloc_path(); | |
154 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
155 | if (IS_ERR(item)) { | |
156 | ret = PTR_ERR(item); | |
157 | /* a csum that isn't present is a preallocated region. */ | |
158 | if (ret == -ENOENT || ret == -EFBIG) | |
159 | ret = 0; | |
ff79f819 | 160 | csum = 0; |
07157aac CM |
161 | goto out; |
162 | } | |
ff79f819 CM |
163 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
164 | BTRFS_CRC32_SIZE); | |
165 | set_state_private(em_tree, start, csum); | |
07157aac CM |
166 | out: |
167 | if (path) | |
168 | btrfs_free_path(path); | |
169 | mutex_unlock(&root->fs_info->fs_mutex); | |
170 | return ret; | |
171 | } | |
172 | ||
173 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
174 | { | |
35ebb934 | 175 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 176 | struct inode *inode = page->mapping->host; |
07157aac CM |
177 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
178 | char *kaddr; | |
179 | u64 private; | |
180 | int ret; | |
ff79f819 CM |
181 | struct btrfs_root *root = BTRFS_I(inode)->root; |
182 | u32 csum = ~(u32)0; | |
bbf0d006 | 183 | unsigned long flags; |
07157aac | 184 | |
b6cda9bc CM |
185 | if (btrfs_test_opt(root, NODATASUM)) |
186 | return 0; | |
187 | ||
07157aac | 188 | ret = get_state_private(em_tree, start, &private); |
bbf0d006 | 189 | local_irq_save(flags); |
07157aac CM |
190 | kaddr = kmap_atomic(page, KM_IRQ0); |
191 | if (ret) { | |
192 | goto zeroit; | |
193 | } | |
ff79f819 CM |
194 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
195 | btrfs_csum_final(csum, (char *)&csum); | |
196 | if (csum != private) { | |
07157aac CM |
197 | goto zeroit; |
198 | } | |
199 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 200 | local_irq_restore(flags); |
07157aac CM |
201 | return 0; |
202 | ||
203 | zeroit: | |
204 | printk("btrfs csum failed ino %lu off %llu\n", | |
205 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
206 | memset(kaddr + offset, 1, end - start + 1); |
207 | flush_dcache_page(page); | |
07157aac | 208 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 209 | local_irq_restore(flags); |
07157aac CM |
210 | return 0; |
211 | } | |
b888db2b | 212 | |
39279cc3 CM |
213 | void btrfs_read_locked_inode(struct inode *inode) |
214 | { | |
215 | struct btrfs_path *path; | |
5f39d397 | 216 | struct extent_buffer *leaf; |
39279cc3 | 217 | struct btrfs_inode_item *inode_item; |
5f39d397 | 218 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
219 | struct btrfs_root *root = BTRFS_I(inode)->root; |
220 | struct btrfs_key location; | |
221 | u64 alloc_group_block; | |
618e21d5 | 222 | u32 rdev; |
39279cc3 CM |
223 | int ret; |
224 | ||
225 | path = btrfs_alloc_path(); | |
226 | BUG_ON(!path); | |
39279cc3 CM |
227 | mutex_lock(&root->fs_info->fs_mutex); |
228 | ||
229 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
230 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 231 | if (ret) |
39279cc3 | 232 | goto make_bad; |
39279cc3 | 233 | |
5f39d397 CM |
234 | leaf = path->nodes[0]; |
235 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
236 | struct btrfs_inode_item); | |
237 | ||
238 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
239 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
240 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
241 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
242 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
243 | ||
244 | tspec = btrfs_inode_atime(inode_item); | |
245 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
246 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
247 | ||
248 | tspec = btrfs_inode_mtime(inode_item); | |
249 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
250 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
251 | ||
252 | tspec = btrfs_inode_ctime(inode_item); | |
253 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
254 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
255 | ||
256 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
257 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 258 | inode->i_rdev = 0; |
5f39d397 CM |
259 | rdev = btrfs_inode_rdev(leaf, inode_item); |
260 | ||
261 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
262 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
263 | alloc_group_block); | |
264 | ||
265 | btrfs_free_path(path); | |
266 | inode_item = NULL; | |
267 | ||
268 | mutex_unlock(&root->fs_info->fs_mutex); | |
269 | ||
270 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
271 | case S_IFREG: |
272 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 273 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
274 | inode->i_fop = &btrfs_file_operations; |
275 | inode->i_op = &btrfs_file_inode_operations; | |
276 | break; | |
277 | case S_IFDIR: | |
278 | inode->i_fop = &btrfs_dir_file_operations; | |
279 | if (root == root->fs_info->tree_root) | |
280 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
281 | else | |
282 | inode->i_op = &btrfs_dir_inode_operations; | |
283 | break; | |
284 | case S_IFLNK: | |
285 | inode->i_op = &btrfs_symlink_inode_operations; | |
286 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
287 | break; | |
618e21d5 JB |
288 | default: |
289 | init_special_inode(inode, inode->i_mode, rdev); | |
290 | break; | |
39279cc3 CM |
291 | } |
292 | return; | |
293 | ||
294 | make_bad: | |
295 | btrfs_release_path(root, path); | |
296 | btrfs_free_path(path); | |
297 | mutex_unlock(&root->fs_info->fs_mutex); | |
298 | make_bad_inode(inode); | |
299 | } | |
300 | ||
5f39d397 CM |
301 | static void fill_inode_item(struct extent_buffer *leaf, |
302 | struct btrfs_inode_item *item, | |
39279cc3 CM |
303 | struct inode *inode) |
304 | { | |
5f39d397 CM |
305 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
306 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
307 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
308 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
309 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
310 | ||
311 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
312 | inode->i_atime.tv_sec); | |
313 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
314 | inode->i_atime.tv_nsec); | |
315 | ||
316 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
317 | inode->i_mtime.tv_sec); | |
318 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
319 | inode->i_mtime.tv_nsec); | |
320 | ||
321 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
322 | inode->i_ctime.tv_sec); | |
323 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
324 | inode->i_ctime.tv_nsec); | |
325 | ||
326 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
327 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
328 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
329 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
330 | BTRFS_I(inode)->block_group->key.objectid); |
331 | } | |
332 | ||
a52d9a80 | 333 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
334 | struct btrfs_root *root, |
335 | struct inode *inode) | |
336 | { | |
337 | struct btrfs_inode_item *inode_item; | |
338 | struct btrfs_path *path; | |
5f39d397 | 339 | struct extent_buffer *leaf; |
39279cc3 CM |
340 | int ret; |
341 | ||
342 | path = btrfs_alloc_path(); | |
343 | BUG_ON(!path); | |
39279cc3 CM |
344 | ret = btrfs_lookup_inode(trans, root, path, |
345 | &BTRFS_I(inode)->location, 1); | |
346 | if (ret) { | |
347 | if (ret > 0) | |
348 | ret = -ENOENT; | |
349 | goto failed; | |
350 | } | |
351 | ||
5f39d397 CM |
352 | leaf = path->nodes[0]; |
353 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
354 | struct btrfs_inode_item); |
355 | ||
5f39d397 CM |
356 | fill_inode_item(leaf, inode_item, inode); |
357 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 358 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
359 | ret = 0; |
360 | failed: | |
361 | btrfs_release_path(root, path); | |
362 | btrfs_free_path(path); | |
363 | return ret; | |
364 | } | |
365 | ||
366 | ||
367 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
368 | struct btrfs_root *root, | |
369 | struct inode *dir, | |
370 | struct dentry *dentry) | |
371 | { | |
372 | struct btrfs_path *path; | |
373 | const char *name = dentry->d_name.name; | |
374 | int name_len = dentry->d_name.len; | |
375 | int ret = 0; | |
5f39d397 | 376 | struct extent_buffer *leaf; |
39279cc3 | 377 | struct btrfs_dir_item *di; |
5f39d397 | 378 | struct btrfs_key key; |
39279cc3 CM |
379 | |
380 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
381 | if (!path) { |
382 | ret = -ENOMEM; | |
383 | goto err; | |
384 | } | |
385 | ||
39279cc3 CM |
386 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
387 | name, name_len, -1); | |
388 | if (IS_ERR(di)) { | |
389 | ret = PTR_ERR(di); | |
390 | goto err; | |
391 | } | |
392 | if (!di) { | |
393 | ret = -ENOENT; | |
394 | goto err; | |
395 | } | |
5f39d397 CM |
396 | leaf = path->nodes[0]; |
397 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 398 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
399 | if (ret) |
400 | goto err; | |
39279cc3 CM |
401 | btrfs_release_path(root, path); |
402 | ||
403 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 404 | key.objectid, name, name_len, -1); |
39279cc3 CM |
405 | if (IS_ERR(di)) { |
406 | ret = PTR_ERR(di); | |
407 | goto err; | |
408 | } | |
409 | if (!di) { | |
410 | ret = -ENOENT; | |
411 | goto err; | |
412 | } | |
413 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
414 | |
415 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
416 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
417 | dentry->d_inode->i_ino, | |
418 | dentry->d_parent->d_inode->i_ino); | |
419 | if (ret) { | |
420 | printk("failed to delete reference to %.*s, " | |
421 | "inode %lu parent %lu\n", name_len, name, | |
422 | dentry->d_inode->i_ino, | |
423 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 424 | } |
39279cc3 CM |
425 | err: |
426 | btrfs_free_path(path); | |
427 | if (!ret) { | |
428 | dir->i_size -= name_len * 2; | |
79c44584 | 429 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
430 | btrfs_update_inode(trans, root, dir); |
431 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 432 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
433 | dir->i_sb->s_dirt = 1; |
434 | } | |
435 | return ret; | |
436 | } | |
437 | ||
438 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
439 | { | |
440 | struct btrfs_root *root; | |
441 | struct btrfs_trans_handle *trans; | |
442 | int ret; | |
d3c2fdcf | 443 | unsigned long nr; |
39279cc3 CM |
444 | |
445 | root = BTRFS_I(dir)->root; | |
446 | mutex_lock(&root->fs_info->fs_mutex); | |
447 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 448 | |
39279cc3 CM |
449 | btrfs_set_trans_block_group(trans, dir); |
450 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 451 | nr = trans->blocks_used; |
5f39d397 | 452 | |
39279cc3 CM |
453 | btrfs_end_transaction(trans, root); |
454 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 455 | btrfs_btree_balance_dirty(root, nr); |
5f39d397 | 456 | |
39279cc3 CM |
457 | return ret; |
458 | } | |
459 | ||
460 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
461 | { | |
462 | struct inode *inode = dentry->d_inode; | |
463 | int err; | |
464 | int ret; | |
465 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 466 | struct btrfs_trans_handle *trans; |
d3c2fdcf | 467 | unsigned long nr; |
39279cc3 | 468 | |
134d4512 Y |
469 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
470 | return -ENOTEMPTY; | |
471 | ||
39279cc3 CM |
472 | mutex_lock(&root->fs_info->fs_mutex); |
473 | trans = btrfs_start_transaction(root, 1); | |
474 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
475 | |
476 | /* now the directory is empty */ | |
477 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
478 | if (!err) { | |
479 | inode->i_size = 0; | |
480 | } | |
3954401f | 481 | |
d3c2fdcf | 482 | nr = trans->blocks_used; |
39279cc3 | 483 | ret = btrfs_end_transaction(trans, root); |
134d4512 | 484 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 485 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 486 | |
39279cc3 CM |
487 | if (ret && !err) |
488 | err = ret; | |
489 | return err; | |
490 | } | |
491 | ||
492 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
493 | struct btrfs_root *root, | |
494 | struct inode *inode) | |
495 | { | |
496 | struct btrfs_path *path; | |
497 | int ret; | |
498 | ||
499 | clear_inode(inode); | |
500 | ||
501 | path = btrfs_alloc_path(); | |
502 | BUG_ON(!path); | |
39279cc3 CM |
503 | ret = btrfs_lookup_inode(trans, root, path, |
504 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
505 | if (ret > 0) |
506 | ret = -ENOENT; | |
507 | if (!ret) | |
508 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
509 | btrfs_free_path(path); |
510 | return ret; | |
511 | } | |
512 | ||
39279cc3 CM |
513 | /* |
514 | * this can truncate away extent items, csum items and directory items. | |
515 | * It starts at a high offset and removes keys until it can't find | |
516 | * any higher than i_size. | |
517 | * | |
518 | * csum items that cross the new i_size are truncated to the new size | |
519 | * as well. | |
520 | */ | |
521 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
522 | struct btrfs_root *root, | |
523 | struct inode *inode) | |
524 | { | |
525 | int ret; | |
526 | struct btrfs_path *path; | |
527 | struct btrfs_key key; | |
5f39d397 | 528 | struct btrfs_key found_key; |
39279cc3 | 529 | u32 found_type; |
5f39d397 | 530 | struct extent_buffer *leaf; |
39279cc3 CM |
531 | struct btrfs_file_extent_item *fi; |
532 | u64 extent_start = 0; | |
db94535d | 533 | u64 extent_num_bytes = 0; |
39279cc3 | 534 | u64 item_end = 0; |
7bb86316 | 535 | u64 root_gen = 0; |
d8d5f3e1 | 536 | u64 root_owner = 0; |
39279cc3 CM |
537 | int found_extent; |
538 | int del_item; | |
179e29e4 | 539 | int extent_type = -1; |
39279cc3 | 540 | |
a52d9a80 | 541 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 542 | path = btrfs_alloc_path(); |
3c69faec | 543 | path->reada = -1; |
39279cc3 | 544 | BUG_ON(!path); |
5f39d397 | 545 | |
39279cc3 CM |
546 | /* FIXME, add redo link to tree so we don't leak on crash */ |
547 | key.objectid = inode->i_ino; | |
548 | key.offset = (u64)-1; | |
5f39d397 CM |
549 | key.type = (u8)-1; |
550 | ||
39279cc3 CM |
551 | while(1) { |
552 | btrfs_init_path(path); | |
553 | fi = NULL; | |
554 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
555 | if (ret < 0) { | |
556 | goto error; | |
557 | } | |
558 | if (ret > 0) { | |
559 | BUG_ON(path->slots[0] == 0); | |
560 | path->slots[0]--; | |
561 | } | |
5f39d397 CM |
562 | leaf = path->nodes[0]; |
563 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
564 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 565 | |
5f39d397 | 566 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 567 | break; |
5f39d397 | 568 | |
39279cc3 CM |
569 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
570 | found_type != BTRFS_DIR_ITEM_KEY && | |
571 | found_type != BTRFS_DIR_INDEX_KEY && | |
572 | found_type != BTRFS_EXTENT_DATA_KEY) | |
573 | break; | |
574 | ||
5f39d397 | 575 | item_end = found_key.offset; |
39279cc3 | 576 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 577 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 578 | struct btrfs_file_extent_item); |
179e29e4 CM |
579 | extent_type = btrfs_file_extent_type(leaf, fi); |
580 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 581 | item_end += |
db94535d | 582 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
583 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
584 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
585 | path->slots[0]); | |
586 | item_end += btrfs_file_extent_inline_len(leaf, | |
587 | item); | |
39279cc3 | 588 | } |
008630c1 | 589 | item_end--; |
39279cc3 CM |
590 | } |
591 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
592 | ret = btrfs_csum_truncate(trans, root, path, | |
593 | inode->i_size); | |
594 | BUG_ON(ret); | |
595 | } | |
008630c1 | 596 | if (item_end < inode->i_size) { |
b888db2b CM |
597 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
598 | found_type = BTRFS_INODE_ITEM_KEY; | |
599 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
600 | found_type = BTRFS_CSUM_ITEM_KEY; | |
601 | } else if (found_type) { | |
602 | found_type--; | |
603 | } else { | |
604 | break; | |
39279cc3 | 605 | } |
a61721d5 | 606 | btrfs_set_key_type(&key, found_type); |
65555a06 | 607 | btrfs_release_path(root, path); |
b888db2b | 608 | continue; |
39279cc3 | 609 | } |
5f39d397 | 610 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
611 | del_item = 1; |
612 | else | |
613 | del_item = 0; | |
614 | found_extent = 0; | |
615 | ||
616 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
617 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
618 | goto delete; | |
619 | ||
620 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 621 | u64 num_dec; |
db94535d | 622 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 623 | if (!del_item) { |
db94535d CM |
624 | u64 orig_num_bytes = |
625 | btrfs_file_extent_num_bytes(leaf, fi); | |
626 | extent_num_bytes = inode->i_size - | |
5f39d397 | 627 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
628 | btrfs_set_file_extent_num_bytes(leaf, fi, |
629 | extent_num_bytes); | |
630 | num_dec = (orig_num_bytes - | |
631 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
632 | if (extent_start != 0) { |
633 | inode->i_blocks -= num_dec; | |
634 | } | |
5f39d397 | 635 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 636 | } else { |
db94535d CM |
637 | extent_num_bytes = |
638 | btrfs_file_extent_disk_num_bytes(leaf, | |
639 | fi); | |
39279cc3 | 640 | /* FIXME blocksize != 4096 */ |
db94535d CM |
641 | num_dec = btrfs_file_extent_num_bytes(leaf, |
642 | fi) >> 9; | |
39279cc3 CM |
643 | if (extent_start != 0) { |
644 | found_extent = 1; | |
645 | inode->i_blocks -= num_dec; | |
646 | } | |
d8d5f3e1 CM |
647 | root_gen = btrfs_header_generation(leaf); |
648 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 649 | } |
179e29e4 CM |
650 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
651 | !del_item) { | |
652 | u32 newsize = inode->i_size - found_key.offset; | |
653 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
654 | ret = btrfs_truncate_item(trans, root, path, | |
655 | newsize, 1); | |
656 | BUG_ON(ret); | |
39279cc3 | 657 | } |
179e29e4 | 658 | delete: |
39279cc3 CM |
659 | if (del_item) { |
660 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
661 | if (ret) |
662 | goto error; | |
39279cc3 CM |
663 | } else { |
664 | break; | |
665 | } | |
666 | btrfs_release_path(root, path); | |
667 | if (found_extent) { | |
668 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 669 | extent_num_bytes, |
d8d5f3e1 | 670 | root_owner, |
7bb86316 CM |
671 | root_gen, inode->i_ino, |
672 | found_key.offset, 0); | |
39279cc3 CM |
673 | BUG_ON(ret); |
674 | } | |
675 | } | |
676 | ret = 0; | |
677 | error: | |
678 | btrfs_release_path(root, path); | |
679 | btrfs_free_path(path); | |
680 | inode->i_sb->s_dirt = 1; | |
681 | return ret; | |
682 | } | |
683 | ||
b888db2b | 684 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
685 | size_t zero_start) |
686 | { | |
687 | char *kaddr; | |
688 | int ret = 0; | |
b888db2b | 689 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
35ebb934 | 690 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 691 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 | 692 | |
b3cfa35a | 693 | set_page_extent_mapped(page); |
a52d9a80 | 694 | |
b888db2b CM |
695 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
696 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
697 | page_end, GFP_NOFS); | |
a52d9a80 | 698 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 699 | kaddr = kmap(page); |
a52d9a80 CM |
700 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
701 | flush_dcache_page(page); | |
b888db2b | 702 | kunmap(page); |
a52d9a80 | 703 | } |
b888db2b CM |
704 | set_page_dirty(page); |
705 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 706 | |
a52d9a80 CM |
707 | return ret; |
708 | } | |
709 | ||
39279cc3 CM |
710 | /* |
711 | * taken from block_truncate_page, but does cow as it zeros out | |
712 | * any bytes left in the last page in the file. | |
713 | */ | |
714 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
715 | { | |
716 | struct inode *inode = mapping->host; | |
db94535d CM |
717 | struct btrfs_root *root = BTRFS_I(inode)->root; |
718 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
719 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
720 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
721 | struct page *page; | |
39279cc3 | 722 | int ret = 0; |
a52d9a80 | 723 | u64 page_start; |
39279cc3 CM |
724 | |
725 | if ((offset & (blocksize - 1)) == 0) | |
726 | goto out; | |
727 | ||
db94535d | 728 | down_read(&root->snap_sem); |
39279cc3 CM |
729 | ret = -ENOMEM; |
730 | page = grab_cache_page(mapping, index); | |
731 | if (!page) | |
732 | goto out; | |
39279cc3 | 733 | if (!PageUptodate(page)) { |
9ebefb18 | 734 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
735 | lock_page(page); |
736 | if (!PageUptodate(page)) { | |
737 | ret = -EIO; | |
738 | goto out; | |
739 | } | |
740 | } | |
35ebb934 | 741 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 742 | |
b888db2b | 743 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 744 | |
39279cc3 CM |
745 | unlock_page(page); |
746 | page_cache_release(page); | |
011410bd | 747 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
748 | out: |
749 | return ret; | |
750 | } | |
751 | ||
752 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
753 | { | |
754 | struct inode *inode = dentry->d_inode; | |
755 | int err; | |
756 | ||
757 | err = inode_change_ok(inode, attr); | |
758 | if (err) | |
759 | return err; | |
760 | ||
761 | if (S_ISREG(inode->i_mode) && | |
762 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
763 | struct btrfs_trans_handle *trans; | |
764 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
765 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
766 | ||
5f39d397 | 767 | u64 mask = root->sectorsize - 1; |
39279cc3 | 768 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 769 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 770 | u64 hole_size; |
179e29e4 | 771 | u64 alloc_hint = 0; |
39279cc3 CM |
772 | |
773 | if (attr->ia_size <= pos) | |
774 | goto out; | |
775 | ||
776 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
777 | ||
2bf5a725 | 778 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 779 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
780 | |
781 | mutex_lock(&root->fs_info->fs_mutex); | |
782 | trans = btrfs_start_transaction(root, 1); | |
783 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 784 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
785 | pos, pos + hole_size, pos, |
786 | &alloc_hint); | |
2bf5a725 | 787 | |
179e29e4 CM |
788 | if (alloc_hint != EXTENT_MAP_INLINE) { |
789 | err = btrfs_insert_file_extent(trans, root, | |
790 | inode->i_ino, | |
791 | pos, 0, 0, hole_size); | |
792 | } | |
39279cc3 CM |
793 | btrfs_end_transaction(trans, root); |
794 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 795 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
796 | if (err) |
797 | return err; | |
39279cc3 CM |
798 | } |
799 | out: | |
800 | err = inode_setattr(inode, attr); | |
801 | ||
802 | return err; | |
803 | } | |
804 | void btrfs_delete_inode(struct inode *inode) | |
805 | { | |
806 | struct btrfs_trans_handle *trans; | |
807 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 808 | unsigned long nr; |
39279cc3 CM |
809 | int ret; |
810 | ||
811 | truncate_inode_pages(&inode->i_data, 0); | |
812 | if (is_bad_inode(inode)) { | |
813 | goto no_delete; | |
814 | } | |
5f39d397 | 815 | |
39279cc3 CM |
816 | inode->i_size = 0; |
817 | mutex_lock(&root->fs_info->fs_mutex); | |
818 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 819 | |
39279cc3 CM |
820 | btrfs_set_trans_block_group(trans, inode); |
821 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
822 | if (ret) |
823 | goto no_delete_lock; | |
824 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
825 | if (ret) |
826 | goto no_delete_lock; | |
827 | ret = btrfs_free_inode(trans, root, inode); | |
828 | if (ret) | |
829 | goto no_delete_lock; | |
d3c2fdcf | 830 | nr = trans->blocks_used; |
5f39d397 | 831 | |
39279cc3 CM |
832 | btrfs_end_transaction(trans, root); |
833 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 834 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 835 | return; |
54aa1f4d CM |
836 | |
837 | no_delete_lock: | |
d3c2fdcf | 838 | nr = trans->blocks_used; |
54aa1f4d CM |
839 | btrfs_end_transaction(trans, root); |
840 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 841 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
842 | no_delete: |
843 | clear_inode(inode); | |
844 | } | |
845 | ||
846 | /* | |
847 | * this returns the key found in the dir entry in the location pointer. | |
848 | * If no dir entries were found, location->objectid is 0. | |
849 | */ | |
850 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
851 | struct btrfs_key *location) | |
852 | { | |
853 | const char *name = dentry->d_name.name; | |
854 | int namelen = dentry->d_name.len; | |
855 | struct btrfs_dir_item *di; | |
856 | struct btrfs_path *path; | |
857 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 858 | int ret = 0; |
39279cc3 | 859 | |
3954401f CM |
860 | if (namelen == 1 && strcmp(name, ".") == 0) { |
861 | location->objectid = dir->i_ino; | |
862 | location->type = BTRFS_INODE_ITEM_KEY; | |
863 | location->offset = 0; | |
864 | return 0; | |
865 | } | |
39279cc3 CM |
866 | path = btrfs_alloc_path(); |
867 | BUG_ON(!path); | |
3954401f | 868 | |
7a720536 | 869 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
870 | struct btrfs_key key; |
871 | struct extent_buffer *leaf; | |
872 | u32 nritems; | |
873 | int slot; | |
874 | ||
875 | key.objectid = dir->i_ino; | |
876 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
877 | key.offset = 0; | |
878 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
879 | BUG_ON(ret == 0); | |
880 | ret = 0; | |
881 | ||
882 | leaf = path->nodes[0]; | |
883 | slot = path->slots[0]; | |
884 | nritems = btrfs_header_nritems(leaf); | |
885 | if (slot >= nritems) | |
886 | goto out_err; | |
887 | ||
888 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
889 | if (key.objectid != dir->i_ino || | |
890 | key.type != BTRFS_INODE_REF_KEY) { | |
891 | goto out_err; | |
892 | } | |
893 | location->objectid = key.offset; | |
894 | location->type = BTRFS_INODE_ITEM_KEY; | |
895 | location->offset = 0; | |
896 | goto out; | |
897 | } | |
898 | ||
39279cc3 CM |
899 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
900 | namelen, 0); | |
0d9f7f3e Y |
901 | if (IS_ERR(di)) |
902 | ret = PTR_ERR(di); | |
39279cc3 | 903 | if (!di || IS_ERR(di)) { |
3954401f | 904 | goto out_err; |
39279cc3 | 905 | } |
5f39d397 | 906 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 907 | out: |
39279cc3 CM |
908 | btrfs_free_path(path); |
909 | return ret; | |
3954401f CM |
910 | out_err: |
911 | location->objectid = 0; | |
912 | goto out; | |
39279cc3 CM |
913 | } |
914 | ||
915 | /* | |
916 | * when we hit a tree root in a directory, the btrfs part of the inode | |
917 | * needs to be changed to reflect the root directory of the tree root. This | |
918 | * is kind of like crossing a mount point. | |
919 | */ | |
920 | static int fixup_tree_root_location(struct btrfs_root *root, | |
921 | struct btrfs_key *location, | |
58176a96 JB |
922 | struct btrfs_root **sub_root, |
923 | struct dentry *dentry) | |
39279cc3 CM |
924 | { |
925 | struct btrfs_path *path; | |
926 | struct btrfs_root_item *ri; | |
927 | ||
928 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
929 | return 0; | |
930 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
931 | return 0; | |
932 | ||
933 | path = btrfs_alloc_path(); | |
934 | BUG_ON(!path); | |
935 | mutex_lock(&root->fs_info->fs_mutex); | |
936 | ||
58176a96 JB |
937 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
938 | dentry->d_name.name, | |
939 | dentry->d_name.len); | |
39279cc3 CM |
940 | if (IS_ERR(*sub_root)) |
941 | return PTR_ERR(*sub_root); | |
942 | ||
943 | ri = &(*sub_root)->root_item; | |
944 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
945 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
946 | location->offset = 0; | |
947 | ||
948 | btrfs_free_path(path); | |
949 | mutex_unlock(&root->fs_info->fs_mutex); | |
950 | return 0; | |
951 | } | |
952 | ||
953 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
954 | { | |
955 | struct btrfs_iget_args *args = p; | |
956 | inode->i_ino = args->ino; | |
957 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
958 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
959 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
960 | return 0; |
961 | } | |
962 | ||
963 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
964 | { | |
965 | struct btrfs_iget_args *args = opaque; | |
966 | return (args->ino == inode->i_ino && | |
967 | args->root == BTRFS_I(inode)->root); | |
968 | } | |
969 | ||
970 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
971 | struct btrfs_root *root) | |
972 | { | |
973 | struct inode *inode; | |
974 | struct btrfs_iget_args args; | |
975 | args.ino = objectid; | |
976 | args.root = root; | |
977 | ||
978 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
979 | btrfs_init_locked_inode, | |
980 | (void *)&args); | |
981 | return inode; | |
982 | } | |
983 | ||
984 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
985 | struct nameidata *nd) | |
986 | { | |
987 | struct inode * inode; | |
988 | struct btrfs_inode *bi = BTRFS_I(dir); | |
989 | struct btrfs_root *root = bi->root; | |
990 | struct btrfs_root *sub_root = root; | |
991 | struct btrfs_key location; | |
992 | int ret; | |
993 | ||
994 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
995 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 996 | |
39279cc3 CM |
997 | mutex_lock(&root->fs_info->fs_mutex); |
998 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
999 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1000 | |
39279cc3 CM |
1001 | if (ret < 0) |
1002 | return ERR_PTR(ret); | |
5f39d397 | 1003 | |
39279cc3 CM |
1004 | inode = NULL; |
1005 | if (location.objectid) { | |
58176a96 JB |
1006 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1007 | dentry); | |
39279cc3 CM |
1008 | if (ret < 0) |
1009 | return ERR_PTR(ret); | |
1010 | if (ret > 0) | |
1011 | return ERR_PTR(-ENOENT); | |
1012 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1013 | sub_root); | |
1014 | if (!inode) | |
1015 | return ERR_PTR(-EACCES); | |
1016 | if (inode->i_state & I_NEW) { | |
1017 | /* the inode and parent dir are two different roots */ | |
1018 | if (sub_root != root) { | |
1019 | igrab(inode); | |
1020 | sub_root->inode = inode; | |
1021 | } | |
1022 | BTRFS_I(inode)->root = sub_root; | |
1023 | memcpy(&BTRFS_I(inode)->location, &location, | |
1024 | sizeof(location)); | |
1025 | btrfs_read_locked_inode(inode); | |
1026 | unlock_new_inode(inode); | |
1027 | } | |
1028 | } | |
1029 | return d_splice_alias(inode, dentry); | |
1030 | } | |
1031 | ||
39279cc3 CM |
1032 | static unsigned char btrfs_filetype_table[] = { |
1033 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1034 | }; | |
1035 | ||
1036 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1037 | { | |
1038 | struct inode *inode = filp->f_path.dentry->d_inode; | |
1039 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1040 | struct btrfs_item *item; | |
1041 | struct btrfs_dir_item *di; | |
1042 | struct btrfs_key key; | |
5f39d397 | 1043 | struct btrfs_key found_key; |
39279cc3 CM |
1044 | struct btrfs_path *path; |
1045 | int ret; | |
1046 | u32 nritems; | |
5f39d397 | 1047 | struct extent_buffer *leaf; |
39279cc3 CM |
1048 | int slot; |
1049 | int advance; | |
1050 | unsigned char d_type; | |
1051 | int over = 0; | |
1052 | u32 di_cur; | |
1053 | u32 di_total; | |
1054 | u32 di_len; | |
1055 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1056 | char tmp_name[32]; |
1057 | char *name_ptr; | |
1058 | int name_len; | |
39279cc3 CM |
1059 | |
1060 | /* FIXME, use a real flag for deciding about the key type */ | |
1061 | if (root->fs_info->tree_root == root) | |
1062 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1063 | |
3954401f CM |
1064 | /* special case for "." */ |
1065 | if (filp->f_pos == 0) { | |
1066 | over = filldir(dirent, ".", 1, | |
1067 | 1, inode->i_ino, | |
1068 | DT_DIR); | |
1069 | if (over) | |
1070 | return 0; | |
1071 | filp->f_pos = 1; | |
1072 | } | |
1073 | ||
39279cc3 CM |
1074 | mutex_lock(&root->fs_info->fs_mutex); |
1075 | key.objectid = inode->i_ino; | |
3954401f CM |
1076 | path = btrfs_alloc_path(); |
1077 | path->reada = 2; | |
1078 | ||
1079 | /* special case for .., just use the back ref */ | |
1080 | if (filp->f_pos == 1) { | |
1081 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1082 | key.offset = 0; | |
1083 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1084 | BUG_ON(ret == 0); | |
1085 | leaf = path->nodes[0]; | |
1086 | slot = path->slots[0]; | |
1087 | nritems = btrfs_header_nritems(leaf); | |
1088 | if (slot >= nritems) { | |
1089 | btrfs_release_path(root, path); | |
1090 | goto read_dir_items; | |
1091 | } | |
1092 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1093 | btrfs_release_path(root, path); | |
1094 | if (found_key.objectid != key.objectid || | |
1095 | found_key.type != BTRFS_INODE_REF_KEY) | |
1096 | goto read_dir_items; | |
1097 | over = filldir(dirent, "..", 2, | |
1098 | 2, found_key.offset, DT_DIR); | |
1099 | if (over) | |
1100 | goto nopos; | |
1101 | filp->f_pos = 2; | |
1102 | } | |
1103 | ||
1104 | read_dir_items: | |
39279cc3 CM |
1105 | btrfs_set_key_type(&key, key_type); |
1106 | key.offset = filp->f_pos; | |
5f39d397 | 1107 | |
39279cc3 CM |
1108 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1109 | if (ret < 0) | |
1110 | goto err; | |
1111 | advance = 0; | |
39279cc3 | 1112 | while(1) { |
5f39d397 CM |
1113 | leaf = path->nodes[0]; |
1114 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1115 | slot = path->slots[0]; |
1116 | if (advance || slot >= nritems) { | |
1117 | if (slot >= nritems -1) { | |
39279cc3 CM |
1118 | ret = btrfs_next_leaf(root, path); |
1119 | if (ret) | |
1120 | break; | |
5f39d397 CM |
1121 | leaf = path->nodes[0]; |
1122 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1123 | slot = path->slots[0]; |
1124 | } else { | |
1125 | slot++; | |
1126 | path->slots[0]++; | |
1127 | } | |
1128 | } | |
1129 | advance = 1; | |
5f39d397 CM |
1130 | item = btrfs_item_nr(leaf, slot); |
1131 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1132 | ||
1133 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1134 | break; |
5f39d397 | 1135 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1136 | break; |
5f39d397 | 1137 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1138 | continue; |
5f39d397 CM |
1139 | |
1140 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1141 | advance = 1; |
1142 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1143 | di_cur = 0; | |
5f39d397 | 1144 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1145 | while(di_cur < di_total) { |
5f39d397 CM |
1146 | struct btrfs_key location; |
1147 | ||
1148 | name_len = btrfs_dir_name_len(leaf, di); | |
1149 | if (name_len < 32) { | |
1150 | name_ptr = tmp_name; | |
1151 | } else { | |
1152 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1153 | BUG_ON(!name_ptr); | |
1154 | } | |
1155 | read_extent_buffer(leaf, name_ptr, | |
1156 | (unsigned long)(di + 1), name_len); | |
1157 | ||
1158 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1159 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1160 | ||
1161 | over = filldir(dirent, name_ptr, name_len, | |
1162 | found_key.offset, | |
1163 | location.objectid, | |
39279cc3 | 1164 | d_type); |
5f39d397 CM |
1165 | |
1166 | if (name_ptr != tmp_name) | |
1167 | kfree(name_ptr); | |
1168 | ||
39279cc3 CM |
1169 | if (over) |
1170 | goto nopos; | |
5103e947 JB |
1171 | di_len = btrfs_dir_name_len(leaf, di) + |
1172 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1173 | di_cur += di_len; |
1174 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1175 | } | |
1176 | } | |
1177 | filp->f_pos++; | |
1178 | nopos: | |
1179 | ret = 0; | |
1180 | err: | |
1181 | btrfs_release_path(root, path); | |
1182 | btrfs_free_path(path); | |
1183 | mutex_unlock(&root->fs_info->fs_mutex); | |
1184 | return ret; | |
1185 | } | |
1186 | ||
1187 | int btrfs_write_inode(struct inode *inode, int wait) | |
1188 | { | |
1189 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1190 | struct btrfs_trans_handle *trans; | |
1191 | int ret = 0; | |
1192 | ||
1193 | if (wait) { | |
1194 | mutex_lock(&root->fs_info->fs_mutex); | |
1195 | trans = btrfs_start_transaction(root, 1); | |
1196 | btrfs_set_trans_block_group(trans, inode); | |
1197 | ret = btrfs_commit_transaction(trans, root); | |
1198 | mutex_unlock(&root->fs_info->fs_mutex); | |
1199 | } | |
1200 | return ret; | |
1201 | } | |
1202 | ||
1203 | /* | |
54aa1f4d | 1204 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1205 | * inode changes. But, it is most likely to find the inode in cache. |
1206 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1207 | * to keep or drop this code. | |
1208 | */ | |
1209 | void btrfs_dirty_inode(struct inode *inode) | |
1210 | { | |
1211 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1212 | struct btrfs_trans_handle *trans; | |
1213 | ||
1214 | mutex_lock(&root->fs_info->fs_mutex); | |
1215 | trans = btrfs_start_transaction(root, 1); | |
1216 | btrfs_set_trans_block_group(trans, inode); | |
1217 | btrfs_update_inode(trans, root, inode); | |
1218 | btrfs_end_transaction(trans, root); | |
1219 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1220 | } |
1221 | ||
1222 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1223 | struct btrfs_root *root, | |
1224 | u64 objectid, | |
1225 | struct btrfs_block_group_cache *group, | |
1226 | int mode) | |
1227 | { | |
1228 | struct inode *inode; | |
5f39d397 | 1229 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1230 | struct btrfs_key *location; |
5f39d397 | 1231 | struct btrfs_path *path; |
39279cc3 CM |
1232 | int ret; |
1233 | int owner; | |
1234 | ||
5f39d397 CM |
1235 | path = btrfs_alloc_path(); |
1236 | BUG_ON(!path); | |
1237 | ||
39279cc3 CM |
1238 | inode = new_inode(root->fs_info->sb); |
1239 | if (!inode) | |
1240 | return ERR_PTR(-ENOMEM); | |
1241 | ||
b888db2b CM |
1242 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1243 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1244 | BTRFS_I(inode)->root = root; |
b888db2b | 1245 | |
39279cc3 CM |
1246 | if (mode & S_IFDIR) |
1247 | owner = 0; | |
1248 | else | |
1249 | owner = 1; | |
1250 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1251 | BTRFS_I(inode)->block_group = group; | |
1252 | ||
5f39d397 CM |
1253 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1254 | if (ret) | |
1255 | goto fail; | |
1256 | ||
39279cc3 CM |
1257 | inode->i_uid = current->fsuid; |
1258 | inode->i_gid = current->fsgid; | |
1259 | inode->i_mode = mode; | |
1260 | inode->i_ino = objectid; | |
1261 | inode->i_blocks = 0; | |
1262 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1263 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1264 | struct btrfs_inode_item); | |
1265 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1266 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1267 | btrfs_free_path(path); | |
1268 | ||
39279cc3 CM |
1269 | location = &BTRFS_I(inode)->location; |
1270 | location->objectid = objectid; | |
39279cc3 CM |
1271 | location->offset = 0; |
1272 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1273 | ||
39279cc3 CM |
1274 | insert_inode_hash(inode); |
1275 | return inode; | |
5f39d397 CM |
1276 | fail: |
1277 | btrfs_free_path(path); | |
1278 | return ERR_PTR(ret); | |
39279cc3 CM |
1279 | } |
1280 | ||
1281 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1282 | { | |
1283 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1284 | } | |
1285 | ||
1286 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1287 | struct dentry *dentry, struct inode *inode) | |
1288 | { | |
1289 | int ret; | |
1290 | struct btrfs_key key; | |
1291 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1292 | struct inode *parent_inode; |
5f39d397 | 1293 | |
39279cc3 | 1294 | key.objectid = inode->i_ino; |
39279cc3 CM |
1295 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1296 | key.offset = 0; | |
1297 | ||
1298 | ret = btrfs_insert_dir_item(trans, root, | |
1299 | dentry->d_name.name, dentry->d_name.len, | |
1300 | dentry->d_parent->d_inode->i_ino, | |
1301 | &key, btrfs_inode_type(inode)); | |
1302 | if (ret == 0) { | |
76fea00a CM |
1303 | ret = btrfs_insert_inode_ref(trans, root, |
1304 | dentry->d_name.name, | |
1305 | dentry->d_name.len, | |
1306 | inode->i_ino, | |
1307 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1308 | parent_inode = dentry->d_parent->d_inode; |
1309 | parent_inode->i_size += dentry->d_name.len * 2; | |
1310 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1311 | ret = btrfs_update_inode(trans, root, |
1312 | dentry->d_parent->d_inode); | |
1313 | } | |
1314 | return ret; | |
1315 | } | |
1316 | ||
1317 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1318 | struct dentry *dentry, struct inode *inode) | |
1319 | { | |
1320 | int err = btrfs_add_link(trans, dentry, inode); | |
1321 | if (!err) { | |
1322 | d_instantiate(dentry, inode); | |
1323 | return 0; | |
1324 | } | |
1325 | if (err > 0) | |
1326 | err = -EEXIST; | |
1327 | return err; | |
1328 | } | |
1329 | ||
618e21d5 JB |
1330 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1331 | int mode, dev_t rdev) | |
1332 | { | |
1333 | struct btrfs_trans_handle *trans; | |
1334 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1335 | struct inode *inode; | |
1336 | int err; | |
1337 | int drop_inode = 0; | |
1338 | u64 objectid; | |
d3c2fdcf | 1339 | unsigned long nr; |
618e21d5 JB |
1340 | |
1341 | if (!new_valid_dev(rdev)) | |
1342 | return -EINVAL; | |
1343 | ||
1344 | mutex_lock(&root->fs_info->fs_mutex); | |
1345 | trans = btrfs_start_transaction(root, 1); | |
1346 | btrfs_set_trans_block_group(trans, dir); | |
1347 | ||
1348 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1349 | if (err) { | |
1350 | err = -ENOSPC; | |
1351 | goto out_unlock; | |
1352 | } | |
1353 | ||
1354 | inode = btrfs_new_inode(trans, root, objectid, | |
1355 | BTRFS_I(dir)->block_group, mode); | |
1356 | err = PTR_ERR(inode); | |
1357 | if (IS_ERR(inode)) | |
1358 | goto out_unlock; | |
1359 | ||
1360 | btrfs_set_trans_block_group(trans, inode); | |
1361 | err = btrfs_add_nondir(trans, dentry, inode); | |
1362 | if (err) | |
1363 | drop_inode = 1; | |
1364 | else { | |
1365 | inode->i_op = &btrfs_special_inode_operations; | |
1366 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1367 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1368 | } |
1369 | dir->i_sb->s_dirt = 1; | |
1370 | btrfs_update_inode_block_group(trans, inode); | |
1371 | btrfs_update_inode_block_group(trans, dir); | |
1372 | out_unlock: | |
d3c2fdcf | 1373 | nr = trans->blocks_used; |
618e21d5 JB |
1374 | btrfs_end_transaction(trans, root); |
1375 | mutex_unlock(&root->fs_info->fs_mutex); | |
1376 | ||
1377 | if (drop_inode) { | |
1378 | inode_dec_link_count(inode); | |
1379 | iput(inode); | |
1380 | } | |
d3c2fdcf | 1381 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1382 | return err; |
1383 | } | |
1384 | ||
39279cc3 CM |
1385 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1386 | int mode, struct nameidata *nd) | |
1387 | { | |
1388 | struct btrfs_trans_handle *trans; | |
1389 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1390 | struct inode *inode; | |
1391 | int err; | |
1392 | int drop_inode = 0; | |
d3c2fdcf | 1393 | unsigned long nr; |
39279cc3 CM |
1394 | u64 objectid; |
1395 | ||
1396 | mutex_lock(&root->fs_info->fs_mutex); | |
1397 | trans = btrfs_start_transaction(root, 1); | |
1398 | btrfs_set_trans_block_group(trans, dir); | |
1399 | ||
1400 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1401 | if (err) { | |
1402 | err = -ENOSPC; | |
1403 | goto out_unlock; | |
1404 | } | |
1405 | ||
1406 | inode = btrfs_new_inode(trans, root, objectid, | |
1407 | BTRFS_I(dir)->block_group, mode); | |
1408 | err = PTR_ERR(inode); | |
1409 | if (IS_ERR(inode)) | |
1410 | goto out_unlock; | |
1411 | ||
1412 | btrfs_set_trans_block_group(trans, inode); | |
1413 | err = btrfs_add_nondir(trans, dentry, inode); | |
1414 | if (err) | |
1415 | drop_inode = 1; | |
1416 | else { | |
1417 | inode->i_mapping->a_ops = &btrfs_aops; | |
1418 | inode->i_fop = &btrfs_file_operations; | |
1419 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1420 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1421 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1422 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1423 | } |
1424 | dir->i_sb->s_dirt = 1; | |
1425 | btrfs_update_inode_block_group(trans, inode); | |
1426 | btrfs_update_inode_block_group(trans, dir); | |
1427 | out_unlock: | |
d3c2fdcf | 1428 | nr = trans->blocks_used; |
39279cc3 CM |
1429 | btrfs_end_transaction(trans, root); |
1430 | mutex_unlock(&root->fs_info->fs_mutex); | |
1431 | ||
1432 | if (drop_inode) { | |
1433 | inode_dec_link_count(inode); | |
1434 | iput(inode); | |
1435 | } | |
d3c2fdcf | 1436 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1437 | return err; |
1438 | } | |
1439 | ||
1440 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1441 | struct dentry *dentry) | |
1442 | { | |
1443 | struct btrfs_trans_handle *trans; | |
1444 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1445 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1446 | unsigned long nr; |
39279cc3 CM |
1447 | int err; |
1448 | int drop_inode = 0; | |
1449 | ||
1450 | if (inode->i_nlink == 0) | |
1451 | return -ENOENT; | |
1452 | ||
1453 | inc_nlink(inode); | |
1454 | mutex_lock(&root->fs_info->fs_mutex); | |
1455 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1456 | |
39279cc3 CM |
1457 | btrfs_set_trans_block_group(trans, dir); |
1458 | atomic_inc(&inode->i_count); | |
1459 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1460 | |
39279cc3 CM |
1461 | if (err) |
1462 | drop_inode = 1; | |
5f39d397 | 1463 | |
39279cc3 CM |
1464 | dir->i_sb->s_dirt = 1; |
1465 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1466 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1467 | |
54aa1f4d CM |
1468 | if (err) |
1469 | drop_inode = 1; | |
39279cc3 | 1470 | |
d3c2fdcf | 1471 | nr = trans->blocks_used; |
39279cc3 CM |
1472 | btrfs_end_transaction(trans, root); |
1473 | mutex_unlock(&root->fs_info->fs_mutex); | |
1474 | ||
1475 | if (drop_inode) { | |
1476 | inode_dec_link_count(inode); | |
1477 | iput(inode); | |
1478 | } | |
d3c2fdcf | 1479 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1480 | return err; |
1481 | } | |
1482 | ||
39279cc3 CM |
1483 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1484 | { | |
1485 | struct inode *inode; | |
1486 | struct btrfs_trans_handle *trans; | |
1487 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1488 | int err = 0; | |
1489 | int drop_on_err = 0; | |
1490 | u64 objectid; | |
d3c2fdcf | 1491 | unsigned long nr = 1; |
39279cc3 CM |
1492 | |
1493 | mutex_lock(&root->fs_info->fs_mutex); | |
1494 | trans = btrfs_start_transaction(root, 1); | |
1495 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1496 | |
39279cc3 CM |
1497 | if (IS_ERR(trans)) { |
1498 | err = PTR_ERR(trans); | |
1499 | goto out_unlock; | |
1500 | } | |
1501 | ||
1502 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1503 | if (err) { | |
1504 | err = -ENOSPC; | |
1505 | goto out_unlock; | |
1506 | } | |
1507 | ||
1508 | inode = btrfs_new_inode(trans, root, objectid, | |
1509 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1510 | if (IS_ERR(inode)) { | |
1511 | err = PTR_ERR(inode); | |
1512 | goto out_fail; | |
1513 | } | |
5f39d397 | 1514 | |
39279cc3 CM |
1515 | drop_on_err = 1; |
1516 | inode->i_op = &btrfs_dir_inode_operations; | |
1517 | inode->i_fop = &btrfs_dir_file_operations; | |
1518 | btrfs_set_trans_block_group(trans, inode); | |
1519 | ||
3954401f | 1520 | inode->i_size = 0; |
39279cc3 CM |
1521 | err = btrfs_update_inode(trans, root, inode); |
1522 | if (err) | |
1523 | goto out_fail; | |
5f39d397 | 1524 | |
39279cc3 CM |
1525 | err = btrfs_add_link(trans, dentry, inode); |
1526 | if (err) | |
1527 | goto out_fail; | |
5f39d397 | 1528 | |
39279cc3 CM |
1529 | d_instantiate(dentry, inode); |
1530 | drop_on_err = 0; | |
1531 | dir->i_sb->s_dirt = 1; | |
1532 | btrfs_update_inode_block_group(trans, inode); | |
1533 | btrfs_update_inode_block_group(trans, dir); | |
1534 | ||
1535 | out_fail: | |
d3c2fdcf | 1536 | nr = trans->blocks_used; |
39279cc3 | 1537 | btrfs_end_transaction(trans, root); |
5f39d397 | 1538 | |
39279cc3 CM |
1539 | out_unlock: |
1540 | mutex_unlock(&root->fs_info->fs_mutex); | |
1541 | if (drop_on_err) | |
1542 | iput(inode); | |
d3c2fdcf | 1543 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1544 | return err; |
1545 | } | |
1546 | ||
a52d9a80 CM |
1547 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1548 | size_t page_offset, u64 start, u64 end, | |
1549 | int create) | |
1550 | { | |
1551 | int ret; | |
1552 | int err = 0; | |
db94535d | 1553 | u64 bytenr; |
a52d9a80 CM |
1554 | u64 extent_start = 0; |
1555 | u64 extent_end = 0; | |
1556 | u64 objectid = inode->i_ino; | |
1557 | u32 found_type; | |
1558 | int failed_insert = 0; | |
1559 | struct btrfs_path *path; | |
1560 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1561 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1562 | struct extent_buffer *leaf; |
1563 | struct btrfs_key found_key; | |
a52d9a80 CM |
1564 | struct extent_map *em = NULL; |
1565 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1566 | struct btrfs_trans_handle *trans = NULL; | |
1567 | ||
1568 | path = btrfs_alloc_path(); | |
1569 | BUG_ON(!path); | |
1570 | mutex_lock(&root->fs_info->fs_mutex); | |
1571 | ||
1572 | again: | |
1573 | em = lookup_extent_mapping(em_tree, start, end); | |
1574 | if (em) { | |
1575 | goto out; | |
1576 | } | |
1577 | if (!em) { | |
1578 | em = alloc_extent_map(GFP_NOFS); | |
1579 | if (!em) { | |
1580 | err = -ENOMEM; | |
1581 | goto out; | |
1582 | } | |
5f39d397 CM |
1583 | em->start = EXTENT_MAP_HOLE; |
1584 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1585 | } |
1586 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1587 | ret = btrfs_lookup_file_extent(trans, root, path, |
1588 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1589 | if (ret < 0) { |
1590 | err = ret; | |
1591 | goto out; | |
1592 | } | |
1593 | ||
1594 | if (ret != 0) { | |
1595 | if (path->slots[0] == 0) | |
1596 | goto not_found; | |
1597 | path->slots[0]--; | |
1598 | } | |
1599 | ||
5f39d397 CM |
1600 | leaf = path->nodes[0]; |
1601 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1602 | struct btrfs_file_extent_item); |
a52d9a80 | 1603 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1604 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1605 | found_type = btrfs_key_type(&found_key); | |
1606 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1607 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1608 | goto not_found; | |
1609 | } | |
1610 | ||
5f39d397 CM |
1611 | found_type = btrfs_file_extent_type(leaf, item); |
1612 | extent_start = found_key.offset; | |
a52d9a80 CM |
1613 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1614 | extent_end = extent_start + | |
db94535d | 1615 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1616 | err = 0; |
b888db2b | 1617 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1618 | em->start = start; |
1619 | if (start < extent_start) { | |
b888db2b CM |
1620 | if (end < extent_start) |
1621 | goto not_found; | |
a52d9a80 CM |
1622 | em->end = extent_end - 1; |
1623 | } else { | |
1624 | em->end = end; | |
1625 | } | |
1626 | goto not_found_em; | |
1627 | } | |
db94535d CM |
1628 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1629 | if (bytenr == 0) { | |
a52d9a80 CM |
1630 | em->start = extent_start; |
1631 | em->end = extent_end - 1; | |
5f39d397 CM |
1632 | em->block_start = EXTENT_MAP_HOLE; |
1633 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1634 | goto insert; |
1635 | } | |
db94535d CM |
1636 | bytenr += btrfs_file_extent_offset(leaf, item); |
1637 | em->block_start = bytenr; | |
a52d9a80 | 1638 | em->block_end = em->block_start + |
db94535d | 1639 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1640 | em->start = extent_start; |
1641 | em->end = extent_end - 1; | |
1642 | goto insert; | |
1643 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1644 | unsigned long ptr; |
a52d9a80 | 1645 | char *map; |
3326d1b0 CM |
1646 | size_t size; |
1647 | size_t extent_offset; | |
1648 | size_t copy_size; | |
a52d9a80 | 1649 | |
5f39d397 CM |
1650 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1651 | path->slots[0])); | |
689f9346 | 1652 | extent_end = (extent_start + size - 1) | |
db94535d | 1653 | ((u64)root->sectorsize - 1); |
b888db2b | 1654 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1655 | em->start = start; |
1656 | if (start < extent_start) { | |
b888db2b CM |
1657 | if (end < extent_start) |
1658 | goto not_found; | |
50b78c24 | 1659 | em->end = extent_end; |
a52d9a80 CM |
1660 | } else { |
1661 | em->end = end; | |
1662 | } | |
1663 | goto not_found_em; | |
1664 | } | |
689f9346 Y |
1665 | em->block_start = EXTENT_MAP_INLINE; |
1666 | em->block_end = EXTENT_MAP_INLINE; | |
1667 | ||
1668 | if (!page) { | |
1669 | em->start = extent_start; | |
1670 | em->end = extent_start + size - 1; | |
1671 | goto out; | |
1672 | } | |
5f39d397 | 1673 | |
35ebb934 | 1674 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1675 | extent_start + page_offset; |
ae2f5411 | 1676 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1677 | size - extent_offset); |
3326d1b0 CM |
1678 | em->start = extent_start + extent_offset; |
1679 | em->end = (em->start + copy_size -1) | | |
1680 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1681 | map = kmap(page); |
1682 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1683 | if (create == 0 && !PageUptodate(page)) { |
1684 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1685 | copy_size); | |
1686 | flush_dcache_page(page); | |
1687 | } else if (create && PageUptodate(page)) { | |
1688 | if (!trans) { | |
1689 | kunmap(page); | |
1690 | free_extent_map(em); | |
1691 | em = NULL; | |
1692 | btrfs_release_path(root, path); | |
1693 | trans = btrfs_start_transaction(root, 1); | |
1694 | goto again; | |
1695 | } | |
1696 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1697 | copy_size); | |
1698 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1699 | } |
a52d9a80 | 1700 | kunmap(page); |
3326d1b0 | 1701 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1702 | goto insert; |
1703 | } else { | |
1704 | printk("unkknown found_type %d\n", found_type); | |
1705 | WARN_ON(1); | |
1706 | } | |
1707 | not_found: | |
1708 | em->start = start; | |
1709 | em->end = end; | |
1710 | not_found_em: | |
5f39d397 CM |
1711 | em->block_start = EXTENT_MAP_HOLE; |
1712 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1713 | insert: |
1714 | btrfs_release_path(root, path); | |
1715 | if (em->start > start || em->end < start) { | |
b888db2b | 1716 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1717 | err = -EIO; |
1718 | goto out; | |
1719 | } | |
1720 | ret = add_extent_mapping(em_tree, em); | |
1721 | if (ret == -EEXIST) { | |
1722 | free_extent_map(em); | |
2bf5a725 | 1723 | em = NULL; |
a52d9a80 CM |
1724 | failed_insert++; |
1725 | if (failed_insert > 5) { | |
1726 | printk("failing to insert %Lu %Lu\n", start, end); | |
1727 | err = -EIO; | |
1728 | goto out; | |
1729 | } | |
a52d9a80 CM |
1730 | goto again; |
1731 | } | |
1732 | err = 0; | |
1733 | out: | |
1734 | btrfs_free_path(path); | |
1735 | if (trans) { | |
1736 | ret = btrfs_end_transaction(trans, root); | |
1737 | if (!err) | |
1738 | err = ret; | |
1739 | } | |
1740 | mutex_unlock(&root->fs_info->fs_mutex); | |
1741 | if (err) { | |
1742 | free_extent_map(em); | |
1743 | WARN_ON(1); | |
1744 | return ERR_PTR(err); | |
1745 | } | |
1746 | return em; | |
1747 | } | |
1748 | ||
d396c6f5 | 1749 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1750 | { |
d396c6f5 | 1751 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1752 | } |
1753 | ||
1754 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1755 | unsigned from, unsigned to) | |
1756 | { | |
a52d9a80 CM |
1757 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1758 | page->mapping->host, page, from, to, | |
1759 | btrfs_get_extent); | |
39279cc3 CM |
1760 | } |
1761 | ||
a52d9a80 | 1762 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1763 | { |
a52d9a80 CM |
1764 | struct extent_map_tree *tree; |
1765 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1766 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1767 | } |
a52d9a80 | 1768 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1769 | { |
a52d9a80 | 1770 | struct extent_map_tree *tree; |
b888db2b CM |
1771 | |
1772 | ||
1773 | if (current->flags & PF_MEMALLOC) { | |
1774 | redirty_page_for_writepage(wbc, page); | |
1775 | unlock_page(page); | |
1776 | return 0; | |
1777 | } | |
a52d9a80 CM |
1778 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1779 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1780 | } |
1781 | ||
b293f02e CM |
1782 | static int btrfs_writepages(struct address_space *mapping, |
1783 | struct writeback_control *wbc) | |
1784 | { | |
1785 | struct extent_map_tree *tree; | |
1786 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1787 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
1788 | } | |
1789 | ||
3ab2fb5a CM |
1790 | static int |
1791 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
1792 | struct list_head *pages, unsigned nr_pages) | |
1793 | { | |
1794 | struct extent_map_tree *tree; | |
1795 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1796 | return extent_readpages(tree, mapping, pages, nr_pages, | |
1797 | btrfs_get_extent); | |
1798 | } | |
1799 | ||
a52d9a80 | 1800 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1801 | { |
a52d9a80 CM |
1802 | struct extent_map_tree *tree; |
1803 | int ret; | |
8c2383c3 | 1804 | |
a52d9a80 CM |
1805 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1806 | ret = try_release_extent_mapping(tree, page); | |
1807 | if (ret == 1) { | |
1808 | ClearPagePrivate(page); | |
1809 | set_page_private(page, 0); | |
1810 | page_cache_release(page); | |
39279cc3 | 1811 | } |
a52d9a80 | 1812 | return ret; |
39279cc3 CM |
1813 | } |
1814 | ||
a52d9a80 | 1815 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1816 | { |
a52d9a80 | 1817 | struct extent_map_tree *tree; |
39279cc3 | 1818 | |
a52d9a80 CM |
1819 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1820 | extent_invalidatepage(tree, page, offset); | |
1821 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1822 | } |
1823 | ||
9ebefb18 CM |
1824 | /* |
1825 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1826 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1827 | * be careful to check for EOF conditions here. We set the page up correctly | |
1828 | * for a written page which means we get ENOSPC checking when writing into | |
1829 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1830 | * support these features. | |
1831 | * | |
1832 | * We are not allowed to take the i_mutex here so we have to play games to | |
1833 | * protect against truncate races as the page could now be beyond EOF. Because | |
1834 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1835 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1836 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1837 | * unlock the page. | |
1838 | */ | |
1839 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1840 | { | |
1841 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1842 | unsigned long end; | |
1843 | loff_t size; | |
1844 | int ret = -EINVAL; | |
a52d9a80 | 1845 | u64 page_start; |
9ebefb18 | 1846 | |
011410bd | 1847 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1848 | lock_page(page); |
1849 | wait_on_page_writeback(page); | |
9ebefb18 | 1850 | size = i_size_read(inode); |
35ebb934 | 1851 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 1852 | |
9ebefb18 | 1853 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1854 | (page_start > size)) { |
9ebefb18 CM |
1855 | /* page got truncated out from underneath us */ |
1856 | goto out_unlock; | |
1857 | } | |
1858 | ||
1859 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1860 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1861 | end = size & ~PAGE_CACHE_MASK; |
1862 | else | |
1863 | end = PAGE_CACHE_SIZE; | |
1864 | ||
b888db2b | 1865 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1866 | |
1867 | out_unlock: | |
011410bd | 1868 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1869 | unlock_page(page); |
1870 | return ret; | |
1871 | } | |
1872 | ||
39279cc3 CM |
1873 | static void btrfs_truncate(struct inode *inode) |
1874 | { | |
1875 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1876 | int ret; | |
1877 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1878 | unsigned long nr; |
39279cc3 CM |
1879 | |
1880 | if (!S_ISREG(inode->i_mode)) | |
1881 | return; | |
1882 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1883 | return; | |
1884 | ||
1885 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1886 | ||
1887 | mutex_lock(&root->fs_info->fs_mutex); | |
1888 | trans = btrfs_start_transaction(root, 1); | |
1889 | btrfs_set_trans_block_group(trans, inode); | |
1890 | ||
1891 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1892 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 1893 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 1894 | nr = trans->blocks_used; |
5f39d397 | 1895 | |
39279cc3 CM |
1896 | ret = btrfs_end_transaction(trans, root); |
1897 | BUG_ON(ret); | |
1898 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1899 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1900 | } |
1901 | ||
1902 | int btrfs_commit_write(struct file *file, struct page *page, | |
1903 | unsigned from, unsigned to) | |
1904 | { | |
e9906a98 CM |
1905 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
1906 | struct inode *inode = page->mapping->host; | |
1907 | ||
1908 | btrfs_cow_one_page(inode, page, PAGE_CACHE_SIZE); | |
1909 | ||
1910 | set_page_extent_mapped(page); | |
1911 | set_page_dirty(page); | |
1912 | ||
1913 | if (pos > inode->i_size) { | |
1914 | i_size_write(inode, pos); | |
1915 | mark_inode_dirty(inode); | |
1916 | } | |
1917 | return 0; | |
39279cc3 CM |
1918 | } |
1919 | ||
1920 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1921 | { | |
1922 | struct btrfs_trans_handle *trans; | |
1923 | struct btrfs_key key; | |
1924 | struct btrfs_root_item root_item; | |
1925 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 1926 | struct extent_buffer *leaf; |
39279cc3 CM |
1927 | struct btrfs_root *new_root; |
1928 | struct inode *inode; | |
1929 | struct inode *dir; | |
1930 | int ret; | |
54aa1f4d | 1931 | int err; |
39279cc3 CM |
1932 | u64 objectid; |
1933 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 1934 | unsigned long nr = 1; |
39279cc3 CM |
1935 | |
1936 | mutex_lock(&root->fs_info->fs_mutex); | |
1937 | trans = btrfs_start_transaction(root, 1); | |
1938 | BUG_ON(!trans); | |
1939 | ||
7bb86316 CM |
1940 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
1941 | 0, &objectid); | |
1942 | if (ret) | |
1943 | goto fail; | |
1944 | ||
1945 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
1946 | objectid, trans->transid, 0, 0, | |
1947 | 0, 0); | |
5f39d397 CM |
1948 | if (IS_ERR(leaf)) |
1949 | return PTR_ERR(leaf); | |
1950 | ||
1951 | btrfs_set_header_nritems(leaf, 0); | |
1952 | btrfs_set_header_level(leaf, 0); | |
db94535d | 1953 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 1954 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
1955 | btrfs_set_header_owner(leaf, objectid); |
1956 | ||
5f39d397 CM |
1957 | write_extent_buffer(leaf, root->fs_info->fsid, |
1958 | (unsigned long)btrfs_header_fsid(leaf), | |
1959 | BTRFS_FSID_SIZE); | |
1960 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
1961 | |
1962 | inode_item = &root_item.inode; | |
1963 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
1964 | inode_item->generation = cpu_to_le64(1); |
1965 | inode_item->size = cpu_to_le64(3); | |
1966 | inode_item->nlink = cpu_to_le32(1); | |
1967 | inode_item->nblocks = cpu_to_le64(1); | |
1968 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 1969 | |
db94535d CM |
1970 | btrfs_set_root_bytenr(&root_item, leaf->start); |
1971 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 1972 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
1973 | btrfs_set_root_used(&root_item, 0); |
1974 | ||
5eda7b5e CM |
1975 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1976 | root_item.drop_level = 0; | |
5f39d397 CM |
1977 | |
1978 | free_extent_buffer(leaf); | |
1979 | leaf = NULL; | |
39279cc3 | 1980 | |
39279cc3 CM |
1981 | btrfs_set_root_dirid(&root_item, new_dirid); |
1982 | ||
1983 | key.objectid = objectid; | |
1984 | key.offset = 1; | |
39279cc3 CM |
1985 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
1986 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1987 | &root_item); | |
54aa1f4d CM |
1988 | if (ret) |
1989 | goto fail; | |
39279cc3 CM |
1990 | |
1991 | /* | |
1992 | * insert the directory item | |
1993 | */ | |
1994 | key.offset = (u64)-1; | |
1995 | dir = root->fs_info->sb->s_root->d_inode; | |
1996 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1997 | name, namelen, dir->i_ino, &key, | |
1998 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1999 | if (ret) |
2000 | goto fail; | |
39279cc3 | 2001 | |
3954401f CM |
2002 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2003 | name, namelen, objectid, | |
2004 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2005 | if (ret) | |
2006 | goto fail; | |
2007 | ||
39279cc3 | 2008 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2009 | if (ret) |
2010 | goto fail_commit; | |
39279cc3 | 2011 | |
58176a96 | 2012 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2013 | BUG_ON(!new_root); |
2014 | ||
2015 | trans = btrfs_start_transaction(new_root, 1); | |
2016 | BUG_ON(!trans); | |
2017 | ||
2018 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2019 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2020 | if (IS_ERR(inode)) |
2021 | goto fail; | |
39279cc3 CM |
2022 | inode->i_op = &btrfs_dir_inode_operations; |
2023 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2024 | new_root->inode = inode; |
39279cc3 | 2025 | |
3954401f CM |
2026 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2027 | new_dirid); | |
39279cc3 | 2028 | inode->i_nlink = 1; |
3954401f | 2029 | inode->i_size = 0; |
39279cc3 | 2030 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2031 | if (ret) |
2032 | goto fail; | |
2033 | fail: | |
d3c2fdcf | 2034 | nr = trans->blocks_used; |
54aa1f4d CM |
2035 | err = btrfs_commit_transaction(trans, root); |
2036 | if (err && !ret) | |
2037 | ret = err; | |
2038 | fail_commit: | |
39279cc3 | 2039 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2040 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2041 | return ret; |
39279cc3 CM |
2042 | } |
2043 | ||
2044 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2045 | { | |
2046 | struct btrfs_trans_handle *trans; | |
2047 | struct btrfs_key key; | |
2048 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2049 | struct extent_buffer *tmp; |
39279cc3 | 2050 | int ret; |
54aa1f4d | 2051 | int err; |
39279cc3 | 2052 | u64 objectid; |
d3c2fdcf | 2053 | unsigned long nr; |
39279cc3 CM |
2054 | |
2055 | if (!root->ref_cows) | |
2056 | return -EINVAL; | |
2057 | ||
011410bd CM |
2058 | down_write(&root->snap_sem); |
2059 | freeze_bdev(root->fs_info->sb->s_bdev); | |
2060 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
2061 | ||
39279cc3 CM |
2062 | mutex_lock(&root->fs_info->fs_mutex); |
2063 | trans = btrfs_start_transaction(root, 1); | |
2064 | BUG_ON(!trans); | |
2065 | ||
2066 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2067 | if (ret) |
2068 | goto fail; | |
39279cc3 CM |
2069 | |
2070 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2071 | 0, &objectid); | |
54aa1f4d CM |
2072 | if (ret) |
2073 | goto fail; | |
39279cc3 CM |
2074 | |
2075 | memcpy(&new_root_item, &root->root_item, | |
2076 | sizeof(new_root_item)); | |
2077 | ||
2078 | key.objectid = objectid; | |
2079 | key.offset = 1; | |
39279cc3 | 2080 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
9691975d | 2081 | extent_buffer_get(root->node); |
83df7c1d | 2082 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2083 | free_extent_buffer(tmp); |
db94535d CM |
2084 | btrfs_set_root_bytenr(&new_root_item, root->node->start); |
2085 | btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node)); | |
39279cc3 CM |
2086 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2087 | &new_root_item); | |
54aa1f4d CM |
2088 | if (ret) |
2089 | goto fail; | |
39279cc3 CM |
2090 | |
2091 | /* | |
2092 | * insert the directory item | |
2093 | */ | |
2094 | key.offset = (u64)-1; | |
2095 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2096 | name, namelen, | |
2097 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2098 | &key, BTRFS_FT_DIR); | |
2099 | ||
54aa1f4d CM |
2100 | if (ret) |
2101 | goto fail; | |
39279cc3 | 2102 | |
3954401f CM |
2103 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2104 | name, namelen, objectid, | |
2105 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2106 | ||
2107 | if (ret) | |
2108 | goto fail; | |
2109 | ||
7bb86316 | 2110 | ret = btrfs_inc_root_ref(trans, root, objectid); |
54aa1f4d CM |
2111 | if (ret) |
2112 | goto fail; | |
54aa1f4d | 2113 | fail: |
d3c2fdcf | 2114 | nr = trans->blocks_used; |
54aa1f4d | 2115 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2116 | |
54aa1f4d CM |
2117 | if (err && !ret) |
2118 | ret = err; | |
5f39d397 | 2119 | |
39279cc3 | 2120 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2121 | up_write(&root->snap_sem); |
d3c2fdcf | 2122 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2123 | return ret; |
39279cc3 CM |
2124 | } |
2125 | ||
86479a04 CM |
2126 | static unsigned long force_ra(struct address_space *mapping, |
2127 | struct file_ra_state *ra, struct file *file, | |
2128 | pgoff_t offset, pgoff_t last_index) | |
2129 | { | |
2130 | pgoff_t req_size; | |
2131 | ||
2132 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2133 | req_size = last_index - offset + 1; | |
2134 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2135 | return offset; | |
2136 | #else | |
2137 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2138 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2139 | return offset + req_size; | |
2140 | #endif | |
2141 | } | |
2142 | ||
2143 | int btrfs_defrag_file(struct file *file) { | |
2144 | struct inode *inode = file->f_path.dentry->d_inode; | |
2145 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2146 | struct page *page; | |
2147 | unsigned long last_index; | |
2148 | unsigned long ra_index = 0; | |
2149 | u64 page_start; | |
2150 | u64 page_end; | |
2151 | unsigned long i; | |
2152 | ||
2153 | mutex_lock(&inode->i_mutex); | |
2154 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2155 | for (i = 0; i <= last_index; i++) { | |
2156 | if (i == ra_index) { | |
2157 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2158 | file, ra_index, last_index); | |
2159 | } | |
2160 | page = grab_cache_page(inode->i_mapping, i); | |
2161 | if (!page) | |
2162 | goto out_unlock; | |
2163 | if (!PageUptodate(page)) { | |
2164 | btrfs_readpage(NULL, page); | |
2165 | lock_page(page); | |
2166 | if (!PageUptodate(page)) { | |
2167 | unlock_page(page); | |
2168 | page_cache_release(page); | |
2169 | goto out_unlock; | |
2170 | } | |
2171 | } | |
35ebb934 | 2172 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2173 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2174 | ||
2175 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2176 | set_extent_delalloc(em_tree, page_start, | |
2177 | page_end, GFP_NOFS); | |
2178 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2179 | set_page_dirty(page); | |
2180 | unlock_page(page); | |
2181 | page_cache_release(page); | |
2182 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2183 | } | |
2184 | ||
2185 | out_unlock: | |
2186 | mutex_unlock(&inode->i_mutex); | |
2187 | return 0; | |
2188 | } | |
2189 | ||
d03581f4 | 2190 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2191 | { |
39279cc3 | 2192 | struct btrfs_ioctl_vol_args vol_args; |
39279cc3 | 2193 | struct btrfs_dir_item *di; |
39279cc3 | 2194 | struct btrfs_path *path; |
d03581f4 | 2195 | int namelen; |
39279cc3 CM |
2196 | u64 root_dirid; |
2197 | ||
d03581f4 CH |
2198 | if (copy_from_user(&vol_args, arg, sizeof(vol_args))) |
2199 | return -EFAULT; | |
5f39d397 | 2200 | |
d03581f4 CH |
2201 | namelen = strlen(vol_args.name); |
2202 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2203 | return -EINVAL; | |
2204 | if (strchr(vol_args.name, '/')) | |
2205 | return -EINVAL; | |
2206 | ||
2207 | path = btrfs_alloc_path(); | |
2208 | if (!path) | |
2209 | return -ENOMEM; | |
2210 | ||
2211 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2212 | mutex_lock(&root->fs_info->fs_mutex); | |
2213 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2214 | path, root_dirid, | |
2215 | vol_args.name, namelen, 0); | |
2216 | mutex_unlock(&root->fs_info->fs_mutex); | |
2217 | btrfs_free_path(path); | |
2218 | if (di && !IS_ERR(di)) | |
2219 | return -EEXIST; | |
2220 | if (IS_ERR(di)) | |
2221 | return PTR_ERR(di); | |
2222 | ||
2223 | if (root == root->fs_info->tree_root) | |
2224 | return create_subvol(root, vol_args.name, namelen); | |
2225 | return create_snapshot(root, vol_args.name, namelen); | |
2226 | } | |
2227 | ||
2228 | static int btrfs_ioctl_defrag(struct file *file) | |
2229 | { | |
2230 | struct inode *inode = file->f_path.dentry->d_inode; | |
2231 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2232 | ||
2233 | switch (inode->i_mode & S_IFMT) { | |
2234 | case S_IFDIR: | |
39279cc3 | 2235 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2236 | btrfs_defrag_root(root, 0); |
2237 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2238 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2239 | break; |
d03581f4 CH |
2240 | case S_IFREG: |
2241 | btrfs_defrag_file(file); | |
2242 | break; | |
2243 | } | |
2244 | ||
2245 | return 0; | |
2246 | } | |
6702ed49 | 2247 | |
d03581f4 CH |
2248 | long btrfs_ioctl(struct file *file, unsigned int |
2249 | cmd, unsigned long arg) | |
2250 | { | |
2251 | struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root; | |
2252 | ||
2253 | switch (cmd) { | |
2254 | case BTRFS_IOC_SNAP_CREATE: | |
2255 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2256 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2257 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2258 | } |
d03581f4 CH |
2259 | |
2260 | return -ENOTTY; | |
39279cc3 CM |
2261 | } |
2262 | ||
39279cc3 CM |
2263 | /* |
2264 | * Called inside transaction, so use GFP_NOFS | |
2265 | */ | |
2266 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2267 | { | |
2268 | struct btrfs_inode *ei; | |
2269 | ||
2270 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2271 | if (!ei) | |
2272 | return NULL; | |
15ee9bc7 | 2273 | ei->last_trans = 0; |
39279cc3 CM |
2274 | return &ei->vfs_inode; |
2275 | } | |
2276 | ||
2277 | void btrfs_destroy_inode(struct inode *inode) | |
2278 | { | |
2279 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2280 | WARN_ON(inode->i_data.nrpages); | |
2281 | ||
2282 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2283 | } | |
2284 | ||
44ec0b71 CM |
2285 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2286 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2287 | #else | |
39279cc3 CM |
2288 | static void init_once(void * foo, struct kmem_cache * cachep, |
2289 | unsigned long flags) | |
44ec0b71 | 2290 | #endif |
39279cc3 CM |
2291 | { |
2292 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2293 | ||
2294 | inode_init_once(&ei->vfs_inode); | |
2295 | } | |
2296 | ||
2297 | void btrfs_destroy_cachep(void) | |
2298 | { | |
2299 | if (btrfs_inode_cachep) | |
2300 | kmem_cache_destroy(btrfs_inode_cachep); | |
2301 | if (btrfs_trans_handle_cachep) | |
2302 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2303 | if (btrfs_transaction_cachep) | |
2304 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2305 | if (btrfs_bit_radix_cachep) | |
2306 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2307 | if (btrfs_path_cachep) | |
2308 | kmem_cache_destroy(btrfs_path_cachep); | |
2309 | } | |
2310 | ||
86479a04 | 2311 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2312 | unsigned long extra_flags, |
44ec0b71 CM |
2313 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2314 | void (*ctor)(struct kmem_cache *, void *) | |
2315 | #else | |
92fee66d | 2316 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2317 | unsigned long) |
2318 | #endif | |
2319 | ) | |
92fee66d CM |
2320 | { |
2321 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2322 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2323 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2324 | ,NULL | |
2325 | #endif | |
2326 | ); | |
2327 | } | |
2328 | ||
39279cc3 CM |
2329 | int btrfs_init_cachep(void) |
2330 | { | |
86479a04 | 2331 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2332 | sizeof(struct btrfs_inode), |
2333 | 0, init_once); | |
39279cc3 CM |
2334 | if (!btrfs_inode_cachep) |
2335 | goto fail; | |
86479a04 CM |
2336 | btrfs_trans_handle_cachep = |
2337 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2338 | sizeof(struct btrfs_trans_handle), | |
2339 | 0, NULL); | |
39279cc3 CM |
2340 | if (!btrfs_trans_handle_cachep) |
2341 | goto fail; | |
86479a04 | 2342 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2343 | sizeof(struct btrfs_transaction), |
92fee66d | 2344 | 0, NULL); |
39279cc3 CM |
2345 | if (!btrfs_transaction_cachep) |
2346 | goto fail; | |
86479a04 | 2347 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2348 | sizeof(struct btrfs_path), |
92fee66d | 2349 | 0, NULL); |
39279cc3 CM |
2350 | if (!btrfs_path_cachep) |
2351 | goto fail; | |
86479a04 | 2352 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2353 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2354 | if (!btrfs_bit_radix_cachep) |
2355 | goto fail; | |
2356 | return 0; | |
2357 | fail: | |
2358 | btrfs_destroy_cachep(); | |
2359 | return -ENOMEM; | |
2360 | } | |
2361 | ||
2362 | static int btrfs_getattr(struct vfsmount *mnt, | |
2363 | struct dentry *dentry, struct kstat *stat) | |
2364 | { | |
2365 | struct inode *inode = dentry->d_inode; | |
2366 | generic_fillattr(inode, stat); | |
2367 | stat->blksize = 256 * 1024; | |
2368 | return 0; | |
2369 | } | |
2370 | ||
2371 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2372 | struct inode * new_dir,struct dentry *new_dentry) | |
2373 | { | |
2374 | struct btrfs_trans_handle *trans; | |
2375 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2376 | struct inode *new_inode = new_dentry->d_inode; | |
2377 | struct inode *old_inode = old_dentry->d_inode; | |
2378 | struct timespec ctime = CURRENT_TIME; | |
2379 | struct btrfs_path *path; | |
39279cc3 CM |
2380 | int ret; |
2381 | ||
2382 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2383 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2384 | return -ENOTEMPTY; | |
2385 | } | |
5f39d397 | 2386 | |
39279cc3 CM |
2387 | mutex_lock(&root->fs_info->fs_mutex); |
2388 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 2389 | |
39279cc3 CM |
2390 | btrfs_set_trans_block_group(trans, new_dir); |
2391 | path = btrfs_alloc_path(); | |
2392 | if (!path) { | |
2393 | ret = -ENOMEM; | |
2394 | goto out_fail; | |
2395 | } | |
2396 | ||
2397 | old_dentry->d_inode->i_nlink++; | |
2398 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2399 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2400 | old_inode->i_ctime = ctime; | |
5f39d397 | 2401 | |
39279cc3 CM |
2402 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2403 | if (ret) | |
2404 | goto out_fail; | |
2405 | ||
2406 | if (new_inode) { | |
2407 | new_inode->i_ctime = CURRENT_TIME; | |
2408 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2409 | if (ret) | |
2410 | goto out_fail; | |
39279cc3 CM |
2411 | } |
2412 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2413 | if (ret) | |
2414 | goto out_fail; | |
2415 | ||
2416 | out_fail: | |
2417 | btrfs_free_path(path); | |
2418 | btrfs_end_transaction(trans, root); | |
2419 | mutex_unlock(&root->fs_info->fs_mutex); | |
2420 | return ret; | |
2421 | } | |
2422 | ||
2423 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2424 | const char *symname) | |
2425 | { | |
2426 | struct btrfs_trans_handle *trans; | |
2427 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2428 | struct btrfs_path *path; | |
2429 | struct btrfs_key key; | |
2430 | struct inode *inode; | |
2431 | int err; | |
2432 | int drop_inode = 0; | |
2433 | u64 objectid; | |
2434 | int name_len; | |
2435 | int datasize; | |
5f39d397 | 2436 | unsigned long ptr; |
39279cc3 | 2437 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2438 | struct extent_buffer *leaf; |
d3c2fdcf | 2439 | unsigned long nr; |
39279cc3 CM |
2440 | |
2441 | name_len = strlen(symname) + 1; | |
2442 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2443 | return -ENAMETOOLONG; | |
2444 | mutex_lock(&root->fs_info->fs_mutex); | |
2445 | trans = btrfs_start_transaction(root, 1); | |
2446 | btrfs_set_trans_block_group(trans, dir); | |
2447 | ||
2448 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2449 | if (err) { | |
2450 | err = -ENOSPC; | |
2451 | goto out_unlock; | |
2452 | } | |
2453 | ||
2454 | inode = btrfs_new_inode(trans, root, objectid, | |
2455 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2456 | err = PTR_ERR(inode); | |
2457 | if (IS_ERR(inode)) | |
2458 | goto out_unlock; | |
2459 | ||
2460 | btrfs_set_trans_block_group(trans, inode); | |
2461 | err = btrfs_add_nondir(trans, dentry, inode); | |
2462 | if (err) | |
2463 | drop_inode = 1; | |
2464 | else { | |
2465 | inode->i_mapping->a_ops = &btrfs_aops; | |
2466 | inode->i_fop = &btrfs_file_operations; | |
2467 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2468 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2469 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2470 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2471 | } |
2472 | dir->i_sb->s_dirt = 1; | |
2473 | btrfs_update_inode_block_group(trans, inode); | |
2474 | btrfs_update_inode_block_group(trans, dir); | |
2475 | if (drop_inode) | |
2476 | goto out_unlock; | |
2477 | ||
2478 | path = btrfs_alloc_path(); | |
2479 | BUG_ON(!path); | |
2480 | key.objectid = inode->i_ino; | |
2481 | key.offset = 0; | |
39279cc3 CM |
2482 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2483 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2484 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2485 | datasize); | |
54aa1f4d CM |
2486 | if (err) { |
2487 | drop_inode = 1; | |
2488 | goto out_unlock; | |
2489 | } | |
5f39d397 CM |
2490 | leaf = path->nodes[0]; |
2491 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2492 | struct btrfs_file_extent_item); | |
2493 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2494 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2495 | BTRFS_FILE_EXTENT_INLINE); |
2496 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2497 | write_extent_buffer(leaf, symname, ptr, name_len); |
2498 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2499 | btrfs_free_path(path); |
5f39d397 | 2500 | |
39279cc3 CM |
2501 | inode->i_op = &btrfs_symlink_inode_operations; |
2502 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2503 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2504 | err = btrfs_update_inode(trans, root, inode); |
2505 | if (err) | |
2506 | drop_inode = 1; | |
39279cc3 CM |
2507 | |
2508 | out_unlock: | |
d3c2fdcf | 2509 | nr = trans->blocks_used; |
39279cc3 CM |
2510 | btrfs_end_transaction(trans, root); |
2511 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2512 | if (drop_inode) { |
2513 | inode_dec_link_count(inode); | |
2514 | iput(inode); | |
2515 | } | |
d3c2fdcf | 2516 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2517 | return err; |
2518 | } | |
2519 | ||
2520 | static struct inode_operations btrfs_dir_inode_operations = { | |
2521 | .lookup = btrfs_lookup, | |
2522 | .create = btrfs_create, | |
2523 | .unlink = btrfs_unlink, | |
2524 | .link = btrfs_link, | |
2525 | .mkdir = btrfs_mkdir, | |
2526 | .rmdir = btrfs_rmdir, | |
2527 | .rename = btrfs_rename, | |
2528 | .symlink = btrfs_symlink, | |
2529 | .setattr = btrfs_setattr, | |
618e21d5 | 2530 | .mknod = btrfs_mknod, |
5103e947 JB |
2531 | .setxattr = generic_setxattr, |
2532 | .getxattr = generic_getxattr, | |
2533 | .listxattr = btrfs_listxattr, | |
2534 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2535 | }; |
2536 | ||
2537 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2538 | .lookup = btrfs_lookup, | |
2539 | }; | |
2540 | ||
2541 | static struct file_operations btrfs_dir_file_operations = { | |
2542 | .llseek = generic_file_llseek, | |
2543 | .read = generic_read_dir, | |
2544 | .readdir = btrfs_readdir, | |
34287aa3 | 2545 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2546 | #ifdef CONFIG_COMPAT |
34287aa3 | 2547 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2548 | #endif |
2549 | }; | |
2550 | ||
07157aac CM |
2551 | static struct extent_map_ops btrfs_extent_map_ops = { |
2552 | .fill_delalloc = run_delalloc_range, | |
2553 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2554 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2555 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2556 | }; | |
2557 | ||
39279cc3 CM |
2558 | static struct address_space_operations btrfs_aops = { |
2559 | .readpage = btrfs_readpage, | |
2560 | .writepage = btrfs_writepage, | |
b293f02e | 2561 | .writepages = btrfs_writepages, |
3ab2fb5a | 2562 | .readpages = btrfs_readpages, |
39279cc3 CM |
2563 | .sync_page = block_sync_page, |
2564 | .prepare_write = btrfs_prepare_write, | |
2565 | .commit_write = btrfs_commit_write, | |
2566 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2567 | .invalidatepage = btrfs_invalidatepage, |
2568 | .releasepage = btrfs_releasepage, | |
2569 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2570 | }; |
2571 | ||
2572 | static struct address_space_operations btrfs_symlink_aops = { | |
2573 | .readpage = btrfs_readpage, | |
2574 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2575 | .invalidatepage = btrfs_invalidatepage, |
2576 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2577 | }; |
2578 | ||
2579 | static struct inode_operations btrfs_file_inode_operations = { | |
2580 | .truncate = btrfs_truncate, | |
2581 | .getattr = btrfs_getattr, | |
2582 | .setattr = btrfs_setattr, | |
5103e947 JB |
2583 | .setxattr = generic_setxattr, |
2584 | .getxattr = generic_getxattr, | |
2585 | .listxattr = btrfs_listxattr, | |
2586 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2587 | }; |
2588 | ||
618e21d5 JB |
2589 | static struct inode_operations btrfs_special_inode_operations = { |
2590 | .getattr = btrfs_getattr, | |
2591 | .setattr = btrfs_setattr, | |
2592 | }; | |
2593 | ||
39279cc3 CM |
2594 | static struct inode_operations btrfs_symlink_inode_operations = { |
2595 | .readlink = generic_readlink, | |
2596 | .follow_link = page_follow_link_light, | |
2597 | .put_link = page_put_link, | |
2598 | }; |