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Commit | Line | Data |
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f46b5a66 CH |
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 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/bio.h> | |
21 | #include <linux/buffer_head.h> | |
22 | #include <linux/file.h> | |
23 | #include <linux/fs.h> | |
cb8e7090 | 24 | #include <linux/fsnotify.h> |
f46b5a66 CH |
25 | #include <linux/pagemap.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/time.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/string.h> | |
f46b5a66 | 30 | #include <linux/backing-dev.h> |
cb8e7090 | 31 | #include <linux/mount.h> |
f46b5a66 | 32 | #include <linux/mpage.h> |
cb8e7090 | 33 | #include <linux/namei.h> |
f46b5a66 CH |
34 | #include <linux/swap.h> |
35 | #include <linux/writeback.h> | |
36 | #include <linux/statfs.h> | |
37 | #include <linux/compat.h> | |
38 | #include <linux/bit_spinlock.h> | |
cb8e7090 | 39 | #include <linux/security.h> |
f46b5a66 | 40 | #include <linux/xattr.h> |
7ea394f1 | 41 | #include <linux/vmalloc.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
f7039b1d | 43 | #include <linux/blkdev.h> |
4b4e25f2 | 44 | #include "compat.h" |
f46b5a66 CH |
45 | #include "ctree.h" |
46 | #include "disk-io.h" | |
47 | #include "transaction.h" | |
48 | #include "btrfs_inode.h" | |
49 | #include "ioctl.h" | |
50 | #include "print-tree.h" | |
51 | #include "volumes.h" | |
925baedd | 52 | #include "locking.h" |
f46b5a66 | 53 | |
6cbff00f CH |
54 | /* Mask out flags that are inappropriate for the given type of inode. */ |
55 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
56 | { | |
57 | if (S_ISDIR(mode)) | |
58 | return flags; | |
59 | else if (S_ISREG(mode)) | |
60 | return flags & ~FS_DIRSYNC_FL; | |
61 | else | |
62 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
63 | } | |
64 | ||
65 | /* | |
66 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
67 | */ | |
68 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
69 | { | |
70 | unsigned int iflags = 0; | |
71 | ||
72 | if (flags & BTRFS_INODE_SYNC) | |
73 | iflags |= FS_SYNC_FL; | |
74 | if (flags & BTRFS_INODE_IMMUTABLE) | |
75 | iflags |= FS_IMMUTABLE_FL; | |
76 | if (flags & BTRFS_INODE_APPEND) | |
77 | iflags |= FS_APPEND_FL; | |
78 | if (flags & BTRFS_INODE_NODUMP) | |
79 | iflags |= FS_NODUMP_FL; | |
80 | if (flags & BTRFS_INODE_NOATIME) | |
81 | iflags |= FS_NOATIME_FL; | |
82 | if (flags & BTRFS_INODE_DIRSYNC) | |
83 | iflags |= FS_DIRSYNC_FL; | |
84 | ||
85 | return iflags; | |
86 | } | |
87 | ||
88 | /* | |
89 | * Update inode->i_flags based on the btrfs internal flags. | |
90 | */ | |
91 | void btrfs_update_iflags(struct inode *inode) | |
92 | { | |
93 | struct btrfs_inode *ip = BTRFS_I(inode); | |
94 | ||
95 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
96 | ||
97 | if (ip->flags & BTRFS_INODE_SYNC) | |
98 | inode->i_flags |= S_SYNC; | |
99 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
100 | inode->i_flags |= S_IMMUTABLE; | |
101 | if (ip->flags & BTRFS_INODE_APPEND) | |
102 | inode->i_flags |= S_APPEND; | |
103 | if (ip->flags & BTRFS_INODE_NOATIME) | |
104 | inode->i_flags |= S_NOATIME; | |
105 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
106 | inode->i_flags |= S_DIRSYNC; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Inherit flags from the parent inode. | |
111 | * | |
112 | * Unlike extN we don't have any flags we don't want to inherit currently. | |
113 | */ | |
114 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
115 | { | |
0b4dcea5 CM |
116 | unsigned int flags; |
117 | ||
118 | if (!dir) | |
119 | return; | |
120 | ||
121 | flags = BTRFS_I(dir)->flags; | |
6cbff00f CH |
122 | |
123 | if (S_ISREG(inode->i_mode)) | |
124 | flags &= ~BTRFS_INODE_DIRSYNC; | |
125 | else if (!S_ISDIR(inode->i_mode)) | |
126 | flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); | |
127 | ||
128 | BTRFS_I(inode)->flags = flags; | |
129 | btrfs_update_iflags(inode); | |
130 | } | |
131 | ||
132 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
133 | { | |
134 | struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); | |
135 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); | |
136 | ||
137 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
138 | return -EFAULT; | |
139 | return 0; | |
140 | } | |
141 | ||
75e7cb7f LB |
142 | static int check_flags(unsigned int flags) |
143 | { | |
144 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
145 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
146 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
147 | FS_NOCOMP_FL | FS_COMPR_FL | \ | |
148 | FS_NOCOW_FL | FS_COW_FL)) | |
149 | return -EOPNOTSUPP; | |
150 | ||
151 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
152 | return -EINVAL; | |
153 | ||
154 | if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL)) | |
155 | return -EINVAL; | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
6cbff00f CH |
160 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
161 | { | |
162 | struct inode *inode = file->f_path.dentry->d_inode; | |
163 | struct btrfs_inode *ip = BTRFS_I(inode); | |
164 | struct btrfs_root *root = ip->root; | |
165 | struct btrfs_trans_handle *trans; | |
166 | unsigned int flags, oldflags; | |
167 | int ret; | |
168 | ||
b83cc969 LZ |
169 | if (btrfs_root_readonly(root)) |
170 | return -EROFS; | |
171 | ||
6cbff00f CH |
172 | if (copy_from_user(&flags, arg, sizeof(flags))) |
173 | return -EFAULT; | |
174 | ||
75e7cb7f LB |
175 | ret = check_flags(flags); |
176 | if (ret) | |
177 | return ret; | |
f46b5a66 | 178 | |
6cbff00f CH |
179 | if (!is_owner_or_cap(inode)) |
180 | return -EACCES; | |
181 | ||
182 | mutex_lock(&inode->i_mutex); | |
183 | ||
184 | flags = btrfs_mask_flags(inode->i_mode, flags); | |
185 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
186 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
187 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
188 | ret = -EPERM; | |
189 | goto out_unlock; | |
190 | } | |
191 | } | |
192 | ||
193 | ret = mnt_want_write(file->f_path.mnt); | |
194 | if (ret) | |
195 | goto out_unlock; | |
196 | ||
197 | if (flags & FS_SYNC_FL) | |
198 | ip->flags |= BTRFS_INODE_SYNC; | |
199 | else | |
200 | ip->flags &= ~BTRFS_INODE_SYNC; | |
201 | if (flags & FS_IMMUTABLE_FL) | |
202 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
203 | else | |
204 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
205 | if (flags & FS_APPEND_FL) | |
206 | ip->flags |= BTRFS_INODE_APPEND; | |
207 | else | |
208 | ip->flags &= ~BTRFS_INODE_APPEND; | |
209 | if (flags & FS_NODUMP_FL) | |
210 | ip->flags |= BTRFS_INODE_NODUMP; | |
211 | else | |
212 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
213 | if (flags & FS_NOATIME_FL) | |
214 | ip->flags |= BTRFS_INODE_NOATIME; | |
215 | else | |
216 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
217 | if (flags & FS_DIRSYNC_FL) | |
218 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
219 | else | |
220 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
221 | ||
75e7cb7f LB |
222 | /* |
223 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
224 | * flag may be changed automatically if compression code won't make | |
225 | * things smaller. | |
226 | */ | |
227 | if (flags & FS_NOCOMP_FL) { | |
228 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
229 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
230 | } else if (flags & FS_COMPR_FL) { | |
231 | ip->flags |= BTRFS_INODE_COMPRESS; | |
232 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
233 | } | |
234 | if (flags & FS_NOCOW_FL) | |
235 | ip->flags |= BTRFS_INODE_NODATACOW; | |
236 | else if (flags & FS_COW_FL) | |
237 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
6cbff00f CH |
238 | |
239 | trans = btrfs_join_transaction(root, 1); | |
3612b495 | 240 | BUG_ON(IS_ERR(trans)); |
6cbff00f CH |
241 | |
242 | ret = btrfs_update_inode(trans, root, inode); | |
243 | BUG_ON(ret); | |
244 | ||
245 | btrfs_update_iflags(inode); | |
246 | inode->i_ctime = CURRENT_TIME; | |
247 | btrfs_end_transaction(trans, root); | |
248 | ||
249 | mnt_drop_write(file->f_path.mnt); | |
2d4e6f6a | 250 | |
251 | ret = 0; | |
6cbff00f CH |
252 | out_unlock: |
253 | mutex_unlock(&inode->i_mutex); | |
2d4e6f6a | 254 | return ret; |
6cbff00f CH |
255 | } |
256 | ||
257 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
258 | { | |
259 | struct inode *inode = file->f_path.dentry->d_inode; | |
260 | ||
261 | return put_user(inode->i_generation, arg); | |
262 | } | |
f46b5a66 | 263 | |
f7039b1d LD |
264 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
265 | { | |
266 | struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; | |
267 | struct btrfs_fs_info *fs_info = root->fs_info; | |
268 | struct btrfs_device *device; | |
269 | struct request_queue *q; | |
270 | struct fstrim_range range; | |
271 | u64 minlen = ULLONG_MAX; | |
272 | u64 num_devices = 0; | |
273 | int ret; | |
274 | ||
275 | if (!capable(CAP_SYS_ADMIN)) | |
276 | return -EPERM; | |
277 | ||
278 | mutex_lock(&fs_info->fs_devices->device_list_mutex); | |
279 | list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { | |
280 | if (!device->bdev) | |
281 | continue; | |
282 | q = bdev_get_queue(device->bdev); | |
283 | if (blk_queue_discard(q)) { | |
284 | num_devices++; | |
285 | minlen = min((u64)q->limits.discard_granularity, | |
286 | minlen); | |
287 | } | |
288 | } | |
289 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); | |
290 | if (!num_devices) | |
291 | return -EOPNOTSUPP; | |
292 | ||
293 | if (copy_from_user(&range, arg, sizeof(range))) | |
294 | return -EFAULT; | |
295 | ||
296 | range.minlen = max(range.minlen, minlen); | |
297 | ret = btrfs_trim_fs(root, &range); | |
298 | if (ret < 0) | |
299 | return ret; | |
300 | ||
301 | if (copy_to_user(arg, &range, sizeof(range))) | |
302 | return -EFAULT; | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
cb8e7090 CH |
307 | static noinline int create_subvol(struct btrfs_root *root, |
308 | struct dentry *dentry, | |
72fd032e SW |
309 | char *name, int namelen, |
310 | u64 *async_transid) | |
f46b5a66 CH |
311 | { |
312 | struct btrfs_trans_handle *trans; | |
313 | struct btrfs_key key; | |
314 | struct btrfs_root_item root_item; | |
315 | struct btrfs_inode_item *inode_item; | |
316 | struct extent_buffer *leaf; | |
76dda93c | 317 | struct btrfs_root *new_root; |
6a912213 JB |
318 | struct dentry *parent = dget_parent(dentry); |
319 | struct inode *dir; | |
f46b5a66 CH |
320 | int ret; |
321 | int err; | |
322 | u64 objectid; | |
323 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 324 | u64 index = 0; |
f46b5a66 | 325 | |
a22285a6 YZ |
326 | ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, |
327 | 0, &objectid); | |
6a912213 JB |
328 | if (ret) { |
329 | dput(parent); | |
a22285a6 | 330 | return ret; |
6a912213 JB |
331 | } |
332 | ||
333 | dir = parent->d_inode; | |
334 | ||
9ed74f2d JB |
335 | /* |
336 | * 1 - inode item | |
337 | * 2 - refs | |
338 | * 1 - root item | |
339 | * 2 - dir items | |
340 | */ | |
a22285a6 | 341 | trans = btrfs_start_transaction(root, 6); |
6a912213 JB |
342 | if (IS_ERR(trans)) { |
343 | dput(parent); | |
a22285a6 | 344 | return PTR_ERR(trans); |
6a912213 | 345 | } |
f46b5a66 | 346 | |
5d4f98a2 YZ |
347 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
348 | 0, objectid, NULL, 0, 0, 0); | |
8e8a1e31 JB |
349 | if (IS_ERR(leaf)) { |
350 | ret = PTR_ERR(leaf); | |
351 | goto fail; | |
352 | } | |
f46b5a66 | 353 | |
5d4f98a2 | 354 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
355 | btrfs_set_header_bytenr(leaf, leaf->start); |
356 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 357 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
358 | btrfs_set_header_owner(leaf, objectid); |
359 | ||
360 | write_extent_buffer(leaf, root->fs_info->fsid, | |
361 | (unsigned long)btrfs_header_fsid(leaf), | |
362 | BTRFS_FSID_SIZE); | |
5d4f98a2 YZ |
363 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
364 | (unsigned long)btrfs_header_chunk_tree_uuid(leaf), | |
365 | BTRFS_UUID_SIZE); | |
f46b5a66 CH |
366 | btrfs_mark_buffer_dirty(leaf); |
367 | ||
368 | inode_item = &root_item.inode; | |
369 | memset(inode_item, 0, sizeof(*inode_item)); | |
370 | inode_item->generation = cpu_to_le64(1); | |
371 | inode_item->size = cpu_to_le64(3); | |
372 | inode_item->nlink = cpu_to_le32(1); | |
a76a3cd4 | 373 | inode_item->nbytes = cpu_to_le64(root->leafsize); |
f46b5a66 CH |
374 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); |
375 | ||
376 | btrfs_set_root_bytenr(&root_item, leaf->start); | |
84234f3a | 377 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
378 | btrfs_set_root_level(&root_item, 0); |
379 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 380 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 381 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 CH |
382 | |
383 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); | |
384 | root_item.drop_level = 0; | |
385 | ||
925baedd | 386 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
387 | free_extent_buffer(leaf); |
388 | leaf = NULL; | |
389 | ||
390 | btrfs_set_root_dirid(&root_item, new_dirid); | |
391 | ||
392 | key.objectid = objectid; | |
5d4f98a2 | 393 | key.offset = 0; |
f46b5a66 CH |
394 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
395 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
396 | &root_item); | |
397 | if (ret) | |
398 | goto fail; | |
399 | ||
76dda93c YZ |
400 | key.offset = (u64)-1; |
401 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
402 | BUG_ON(IS_ERR(new_root)); | |
403 | ||
404 | btrfs_record_root_in_trans(trans, new_root); | |
405 | ||
406 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid, | |
407 | BTRFS_I(dir)->block_group); | |
f46b5a66 CH |
408 | /* |
409 | * insert the directory item | |
410 | */ | |
3de4586c CM |
411 | ret = btrfs_set_inode_index(dir, &index); |
412 | BUG_ON(ret); | |
413 | ||
414 | ret = btrfs_insert_dir_item(trans, root, | |
f46b5a66 | 415 | name, namelen, dir->i_ino, &key, |
3de4586c | 416 | BTRFS_FT_DIR, index); |
f46b5a66 CH |
417 | if (ret) |
418 | goto fail; | |
0660b5af | 419 | |
52c26179 YZ |
420 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
421 | ret = btrfs_update_inode(trans, root, dir); | |
422 | BUG_ON(ret); | |
423 | ||
0660b5af | 424 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 425 | objectid, root->root_key.objectid, |
0660b5af | 426 | dir->i_ino, index, name, namelen); |
0660b5af | 427 | |
76dda93c | 428 | BUG_ON(ret); |
f46b5a66 | 429 | |
76dda93c | 430 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); |
f46b5a66 | 431 | fail: |
6a912213 | 432 | dput(parent); |
72fd032e SW |
433 | if (async_transid) { |
434 | *async_transid = trans->transid; | |
435 | err = btrfs_commit_transaction_async(trans, root, 1); | |
436 | } else { | |
437 | err = btrfs_commit_transaction(trans, root); | |
438 | } | |
f46b5a66 CH |
439 | if (err && !ret) |
440 | ret = err; | |
f46b5a66 CH |
441 | return ret; |
442 | } | |
443 | ||
72fd032e | 444 | static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, |
b83cc969 LZ |
445 | char *name, int namelen, u64 *async_transid, |
446 | bool readonly) | |
f46b5a66 | 447 | { |
2e4bfab9 | 448 | struct inode *inode; |
6a912213 | 449 | struct dentry *parent; |
f46b5a66 CH |
450 | struct btrfs_pending_snapshot *pending_snapshot; |
451 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 452 | int ret; |
f46b5a66 CH |
453 | |
454 | if (!root->ref_cows) | |
455 | return -EINVAL; | |
456 | ||
3de4586c | 457 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
458 | if (!pending_snapshot) |
459 | return -ENOMEM; | |
460 | ||
461 | btrfs_init_block_rsv(&pending_snapshot->block_rsv); | |
3de4586c | 462 | pending_snapshot->dentry = dentry; |
f46b5a66 | 463 | pending_snapshot->root = root; |
b83cc969 | 464 | pending_snapshot->readonly = readonly; |
a22285a6 YZ |
465 | |
466 | trans = btrfs_start_transaction(root->fs_info->extent_root, 5); | |
467 | if (IS_ERR(trans)) { | |
468 | ret = PTR_ERR(trans); | |
469 | goto fail; | |
470 | } | |
471 | ||
472 | ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); | |
473 | BUG_ON(ret); | |
474 | ||
f46b5a66 CH |
475 | list_add(&pending_snapshot->list, |
476 | &trans->transaction->pending_snapshots); | |
72fd032e SW |
477 | if (async_transid) { |
478 | *async_transid = trans->transid; | |
479 | ret = btrfs_commit_transaction_async(trans, | |
480 | root->fs_info->extent_root, 1); | |
481 | } else { | |
482 | ret = btrfs_commit_transaction(trans, | |
483 | root->fs_info->extent_root); | |
484 | } | |
2e4bfab9 | 485 | BUG_ON(ret); |
a22285a6 YZ |
486 | |
487 | ret = pending_snapshot->error; | |
488 | if (ret) | |
489 | goto fail; | |
490 | ||
66b4ffd1 JB |
491 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
492 | if (ret) | |
493 | goto fail; | |
f46b5a66 | 494 | |
6a912213 JB |
495 | parent = dget_parent(dentry); |
496 | inode = btrfs_lookup_dentry(parent->d_inode, dentry); | |
497 | dput(parent); | |
2e4bfab9 YZ |
498 | if (IS_ERR(inode)) { |
499 | ret = PTR_ERR(inode); | |
500 | goto fail; | |
501 | } | |
502 | BUG_ON(!inode); | |
503 | d_instantiate(dentry, inode); | |
504 | ret = 0; | |
505 | fail: | |
a22285a6 | 506 | kfree(pending_snapshot); |
f46b5a66 CH |
507 | return ret; |
508 | } | |
509 | ||
4260f7c7 SW |
510 | /* copy of check_sticky in fs/namei.c() |
511 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
512 | * minimal. | |
513 | */ | |
514 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
515 | { | |
516 | uid_t fsuid = current_fsuid(); | |
517 | ||
518 | if (!(dir->i_mode & S_ISVTX)) | |
519 | return 0; | |
520 | if (inode->i_uid == fsuid) | |
521 | return 0; | |
522 | if (dir->i_uid == fsuid) | |
523 | return 0; | |
524 | return !capable(CAP_FOWNER); | |
525 | } | |
526 | ||
527 | /* copy of may_delete in fs/namei.c() | |
528 | * Check whether we can remove a link victim from directory dir, check | |
529 | * whether the type of victim is right. | |
530 | * 1. We can't do it if dir is read-only (done in permission()) | |
531 | * 2. We should have write and exec permissions on dir | |
532 | * 3. We can't remove anything from append-only dir | |
533 | * 4. We can't do anything with immutable dir (done in permission()) | |
534 | * 5. If the sticky bit on dir is set we should either | |
535 | * a. be owner of dir, or | |
536 | * b. be owner of victim, or | |
537 | * c. have CAP_FOWNER capability | |
538 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
539 | * links pointing to it. | |
540 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
541 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
542 | * 9. We can't remove a root or mountpoint. | |
543 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
544 | * nfs_async_unlink(). | |
545 | */ | |
546 | ||
547 | static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) | |
548 | { | |
549 | int error; | |
550 | ||
551 | if (!victim->d_inode) | |
552 | return -ENOENT; | |
553 | ||
554 | BUG_ON(victim->d_parent->d_inode != dir); | |
555 | audit_inode_child(victim, dir); | |
556 | ||
557 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
558 | if (error) | |
559 | return error; | |
560 | if (IS_APPEND(dir)) | |
561 | return -EPERM; | |
562 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
563 | IS_APPEND(victim->d_inode)|| | |
564 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
565 | return -EPERM; | |
566 | if (isdir) { | |
567 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
568 | return -ENOTDIR; | |
569 | if (IS_ROOT(victim)) | |
570 | return -EBUSY; | |
571 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
572 | return -EISDIR; | |
573 | if (IS_DEADDIR(dir)) | |
574 | return -ENOENT; | |
575 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
576 | return -EBUSY; | |
577 | return 0; | |
578 | } | |
579 | ||
cb8e7090 CH |
580 | /* copy of may_create in fs/namei.c() */ |
581 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
582 | { | |
583 | if (child->d_inode) | |
584 | return -EEXIST; | |
585 | if (IS_DEADDIR(dir)) | |
586 | return -ENOENT; | |
587 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
588 | } | |
589 | ||
590 | /* | |
591 | * Create a new subvolume below @parent. This is largely modeled after | |
592 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
593 | * inside this filesystem so it's quite a bit simpler. | |
594 | */ | |
76dda93c YZ |
595 | static noinline int btrfs_mksubvol(struct path *parent, |
596 | char *name, int namelen, | |
72fd032e | 597 | struct btrfs_root *snap_src, |
b83cc969 | 598 | u64 *async_transid, bool readonly) |
cb8e7090 | 599 | { |
76dda93c | 600 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
601 | struct dentry *dentry; |
602 | int error; | |
603 | ||
76dda93c | 604 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); |
cb8e7090 CH |
605 | |
606 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
607 | error = PTR_ERR(dentry); | |
608 | if (IS_ERR(dentry)) | |
609 | goto out_unlock; | |
610 | ||
611 | error = -EEXIST; | |
612 | if (dentry->d_inode) | |
613 | goto out_dput; | |
614 | ||
cb8e7090 CH |
615 | error = mnt_want_write(parent->mnt); |
616 | if (error) | |
617 | goto out_dput; | |
618 | ||
76dda93c | 619 | error = btrfs_may_create(dir, dentry); |
cb8e7090 CH |
620 | if (error) |
621 | goto out_drop_write; | |
622 | ||
76dda93c YZ |
623 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
624 | ||
625 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
626 | goto out_up_read; | |
627 | ||
3de4586c | 628 | if (snap_src) { |
72fd032e | 629 | error = create_snapshot(snap_src, dentry, |
b83cc969 | 630 | name, namelen, async_transid, readonly); |
3de4586c | 631 | } else { |
76dda93c | 632 | error = create_subvol(BTRFS_I(dir)->root, dentry, |
72fd032e | 633 | name, namelen, async_transid); |
3de4586c | 634 | } |
76dda93c YZ |
635 | if (!error) |
636 | fsnotify_mkdir(dir, dentry); | |
637 | out_up_read: | |
638 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
639 | out_drop_write: |
640 | mnt_drop_write(parent->mnt); | |
641 | out_dput: | |
642 | dput(dentry); | |
643 | out_unlock: | |
76dda93c | 644 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
645 | return error; |
646 | } | |
647 | ||
940100a4 | 648 | static int should_defrag_range(struct inode *inode, u64 start, u64 len, |
1e701a32 CM |
649 | int thresh, u64 *last_len, u64 *skip, |
650 | u64 *defrag_end) | |
940100a4 CM |
651 | { |
652 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
653 | struct extent_map *em = NULL; | |
654 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
655 | int ret = 1; | |
656 | ||
1e701a32 CM |
657 | |
658 | if (thresh == 0) | |
659 | thresh = 256 * 1024; | |
660 | ||
940100a4 CM |
661 | /* |
662 | * make sure that once we start defragging and extent, we keep on | |
663 | * defragging it | |
664 | */ | |
665 | if (start < *defrag_end) | |
666 | return 1; | |
667 | ||
668 | *skip = 0; | |
669 | ||
670 | /* | |
671 | * hopefully we have this extent in the tree already, try without | |
672 | * the full extent lock | |
673 | */ | |
674 | read_lock(&em_tree->lock); | |
675 | em = lookup_extent_mapping(em_tree, start, len); | |
676 | read_unlock(&em_tree->lock); | |
677 | ||
678 | if (!em) { | |
679 | /* get the big lock and read metadata off disk */ | |
680 | lock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
681 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
682 | unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); | |
683 | ||
6cf8bfbf | 684 | if (IS_ERR(em)) |
940100a4 CM |
685 | return 0; |
686 | } | |
687 | ||
688 | /* this will cover holes, and inline extents */ | |
689 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) | |
690 | ret = 0; | |
691 | ||
692 | /* | |
693 | * we hit a real extent, if it is big don't bother defragging it again | |
694 | */ | |
1e701a32 | 695 | if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) |
940100a4 CM |
696 | ret = 0; |
697 | ||
698 | /* | |
699 | * last_len ends up being a counter of how many bytes we've defragged. | |
700 | * every time we choose not to defrag an extent, we reset *last_len | |
701 | * so that the next tiny extent will force a defrag. | |
702 | * | |
703 | * The end result of this is that tiny extents before a single big | |
704 | * extent will force at least part of that big extent to be defragged. | |
705 | */ | |
706 | if (ret) { | |
707 | *last_len += len; | |
708 | *defrag_end = extent_map_end(em); | |
709 | } else { | |
710 | *last_len = 0; | |
711 | *skip = extent_map_end(em); | |
712 | *defrag_end = 0; | |
713 | } | |
714 | ||
715 | free_extent_map(em); | |
716 | return ret; | |
717 | } | |
718 | ||
1e701a32 CM |
719 | static int btrfs_defrag_file(struct file *file, |
720 | struct btrfs_ioctl_defrag_range_args *range) | |
f46b5a66 CH |
721 | { |
722 | struct inode *inode = fdentry(file)->d_inode; | |
723 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
724 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
3eaa2885 | 725 | struct btrfs_ordered_extent *ordered; |
f46b5a66 | 726 | struct page *page; |
1a419d85 | 727 | struct btrfs_super_block *disk_super; |
f46b5a66 CH |
728 | unsigned long last_index; |
729 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; | |
730 | unsigned long total_read = 0; | |
1a419d85 | 731 | u64 features; |
f46b5a66 CH |
732 | u64 page_start; |
733 | u64 page_end; | |
940100a4 CM |
734 | u64 last_len = 0; |
735 | u64 skip = 0; | |
736 | u64 defrag_end = 0; | |
f46b5a66 CH |
737 | unsigned long i; |
738 | int ret; | |
1a419d85 LZ |
739 | int compress_type = BTRFS_COMPRESS_ZLIB; |
740 | ||
741 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
742 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
743 | return -EINVAL; | |
744 | if (range->compress_type) | |
745 | compress_type = range->compress_type; | |
746 | } | |
f46b5a66 | 747 | |
940100a4 CM |
748 | if (inode->i_size == 0) |
749 | return 0; | |
750 | ||
1e701a32 CM |
751 | if (range->start + range->len > range->start) { |
752 | last_index = min_t(u64, inode->i_size - 1, | |
753 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; | |
754 | } else { | |
755 | last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; | |
756 | } | |
757 | ||
758 | i = range->start >> PAGE_CACHE_SHIFT; | |
940100a4 CM |
759 | while (i <= last_index) { |
760 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, | |
1e701a32 CM |
761 | PAGE_CACHE_SIZE, |
762 | range->extent_thresh, | |
763 | &last_len, &skip, | |
940100a4 CM |
764 | &defrag_end)) { |
765 | unsigned long next; | |
766 | /* | |
767 | * the should_defrag function tells us how much to skip | |
768 | * bump our counter by the suggested amount | |
769 | */ | |
770 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
771 | i = max(i + 1, next); | |
772 | continue; | |
773 | } | |
f46b5a66 | 774 | |
f46b5a66 CH |
775 | if (total_read % ra_pages == 0) { |
776 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
777 | min(last_index, i + ra_pages - 1)); | |
778 | } | |
779 | total_read++; | |
940100a4 | 780 | mutex_lock(&inode->i_mutex); |
1e701a32 | 781 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1a419d85 | 782 | BTRFS_I(inode)->force_compress = compress_type; |
940100a4 | 783 | |
0ca1f7ce YZ |
784 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
785 | if (ret) | |
786 | goto err_unlock; | |
3eaa2885 | 787 | again: |
940100a4 CM |
788 | if (inode->i_size == 0 || |
789 | i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { | |
790 | ret = 0; | |
791 | goto err_reservations; | |
792 | } | |
793 | ||
f46b5a66 | 794 | page = grab_cache_page(inode->i_mapping, i); |
0ca1f7ce YZ |
795 | if (!page) { |
796 | ret = -ENOMEM; | |
940100a4 | 797 | goto err_reservations; |
0ca1f7ce | 798 | } |
940100a4 | 799 | |
f46b5a66 CH |
800 | if (!PageUptodate(page)) { |
801 | btrfs_readpage(NULL, page); | |
802 | lock_page(page); | |
803 | if (!PageUptodate(page)) { | |
804 | unlock_page(page); | |
805 | page_cache_release(page); | |
0ca1f7ce | 806 | ret = -EIO; |
940100a4 | 807 | goto err_reservations; |
f46b5a66 CH |
808 | } |
809 | } | |
810 | ||
940100a4 CM |
811 | if (page->mapping != inode->i_mapping) { |
812 | unlock_page(page); | |
813 | page_cache_release(page); | |
814 | goto again; | |
815 | } | |
816 | ||
f46b5a66 | 817 | wait_on_page_writeback(page); |
f46b5a66 | 818 | |
940100a4 | 819 | if (PageDirty(page)) { |
0ca1f7ce | 820 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
940100a4 CM |
821 | goto loop_unlock; |
822 | } | |
823 | ||
f46b5a66 CH |
824 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
825 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
f46b5a66 | 826 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
3eaa2885 CM |
827 | |
828 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
829 | if (ordered) { | |
830 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
831 | unlock_page(page); | |
832 | page_cache_release(page); | |
833 | btrfs_start_ordered_extent(inode, ordered, 1); | |
834 | btrfs_put_ordered_extent(ordered); | |
835 | goto again; | |
836 | } | |
837 | set_page_extent_mapped(page); | |
838 | ||
f87f057b CM |
839 | /* |
840 | * this makes sure page_mkwrite is called on the | |
841 | * page if it is dirtied again later | |
842 | */ | |
843 | clear_page_dirty_for_io(page); | |
940100a4 CM |
844 | clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, |
845 | page_end, EXTENT_DIRTY | EXTENT_DELALLOC | | |
846 | EXTENT_DO_ACCOUNTING, GFP_NOFS); | |
f87f057b | 847 | |
2ac55d41 | 848 | btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); |
940100a4 | 849 | ClearPageChecked(page); |
f46b5a66 | 850 | set_page_dirty(page); |
a1ed835e | 851 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
940100a4 CM |
852 | |
853 | loop_unlock: | |
f46b5a66 CH |
854 | unlock_page(page); |
855 | page_cache_release(page); | |
940100a4 CM |
856 | mutex_unlock(&inode->i_mutex); |
857 | ||
f46b5a66 | 858 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); |
940100a4 | 859 | i++; |
f46b5a66 CH |
860 | } |
861 | ||
1e701a32 CM |
862 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
863 | filemap_flush(inode->i_mapping); | |
864 | ||
865 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
866 | /* the filemap_flush will queue IO into the worker threads, but | |
867 | * we have to make sure the IO is actually started and that | |
868 | * ordered extents get created before we return | |
869 | */ | |
870 | atomic_inc(&root->fs_info->async_submit_draining); | |
871 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
872 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
873 | wait_event(root->fs_info->async_submit_wait, | |
874 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
875 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
876 | } | |
877 | atomic_dec(&root->fs_info->async_submit_draining); | |
878 | ||
879 | mutex_lock(&inode->i_mutex); | |
261507a0 | 880 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
1e701a32 CM |
881 | mutex_unlock(&inode->i_mutex); |
882 | } | |
883 | ||
1a419d85 LZ |
884 | disk_super = &root->fs_info->super_copy; |
885 | features = btrfs_super_incompat_flags(disk_super); | |
886 | if (range->compress_type == BTRFS_COMPRESS_LZO) { | |
887 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
888 | btrfs_set_super_incompat_flags(disk_super, features); | |
889 | } | |
890 | ||
f46b5a66 | 891 | return 0; |
940100a4 CM |
892 | |
893 | err_reservations: | |
0ca1f7ce YZ |
894 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
895 | err_unlock: | |
940100a4 | 896 | mutex_unlock(&inode->i_mutex); |
940100a4 | 897 | return ret; |
f46b5a66 CH |
898 | } |
899 | ||
76dda93c YZ |
900 | static noinline int btrfs_ioctl_resize(struct btrfs_root *root, |
901 | void __user *arg) | |
f46b5a66 CH |
902 | { |
903 | u64 new_size; | |
904 | u64 old_size; | |
905 | u64 devid = 1; | |
906 | struct btrfs_ioctl_vol_args *vol_args; | |
907 | struct btrfs_trans_handle *trans; | |
908 | struct btrfs_device *device = NULL; | |
909 | char *sizestr; | |
910 | char *devstr = NULL; | |
911 | int ret = 0; | |
f46b5a66 CH |
912 | int mod = 0; |
913 | ||
c146afad YZ |
914 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
915 | return -EROFS; | |
916 | ||
e441d54d CM |
917 | if (!capable(CAP_SYS_ADMIN)) |
918 | return -EPERM; | |
919 | ||
dae7b665 LZ |
920 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
921 | if (IS_ERR(vol_args)) | |
922 | return PTR_ERR(vol_args); | |
5516e595 MF |
923 | |
924 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 925 | |
7d9eb12c | 926 | mutex_lock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
927 | sizestr = vol_args->name; |
928 | devstr = strchr(sizestr, ':'); | |
929 | if (devstr) { | |
930 | char *end; | |
931 | sizestr = devstr + 1; | |
932 | *devstr = '\0'; | |
933 | devstr = vol_args->name; | |
934 | devid = simple_strtoull(devstr, &end, 10); | |
21380931 JB |
935 | printk(KERN_INFO "resizing devid %llu\n", |
936 | (unsigned long long)devid); | |
f46b5a66 | 937 | } |
2b82032c | 938 | device = btrfs_find_device(root, devid, NULL, NULL); |
f46b5a66 | 939 | if (!device) { |
21380931 JB |
940 | printk(KERN_INFO "resizer unable to find device %llu\n", |
941 | (unsigned long long)devid); | |
f46b5a66 CH |
942 | ret = -EINVAL; |
943 | goto out_unlock; | |
944 | } | |
945 | if (!strcmp(sizestr, "max")) | |
946 | new_size = device->bdev->bd_inode->i_size; | |
947 | else { | |
948 | if (sizestr[0] == '-') { | |
949 | mod = -1; | |
950 | sizestr++; | |
951 | } else if (sizestr[0] == '+') { | |
952 | mod = 1; | |
953 | sizestr++; | |
954 | } | |
91748467 | 955 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
956 | if (new_size == 0) { |
957 | ret = -EINVAL; | |
958 | goto out_unlock; | |
959 | } | |
960 | } | |
961 | ||
962 | old_size = device->total_bytes; | |
963 | ||
964 | if (mod < 0) { | |
965 | if (new_size > old_size) { | |
966 | ret = -EINVAL; | |
967 | goto out_unlock; | |
968 | } | |
969 | new_size = old_size - new_size; | |
970 | } else if (mod > 0) { | |
971 | new_size = old_size + new_size; | |
972 | } | |
973 | ||
974 | if (new_size < 256 * 1024 * 1024) { | |
975 | ret = -EINVAL; | |
976 | goto out_unlock; | |
977 | } | |
978 | if (new_size > device->bdev->bd_inode->i_size) { | |
979 | ret = -EFBIG; | |
980 | goto out_unlock; | |
981 | } | |
982 | ||
983 | do_div(new_size, root->sectorsize); | |
984 | new_size *= root->sectorsize; | |
985 | ||
986 | printk(KERN_INFO "new size for %s is %llu\n", | |
987 | device->name, (unsigned long long)new_size); | |
988 | ||
989 | if (new_size > old_size) { | |
a22285a6 | 990 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
991 | if (IS_ERR(trans)) { |
992 | ret = PTR_ERR(trans); | |
993 | goto out_unlock; | |
994 | } | |
f46b5a66 CH |
995 | ret = btrfs_grow_device(trans, device, new_size); |
996 | btrfs_commit_transaction(trans, root); | |
997 | } else { | |
998 | ret = btrfs_shrink_device(device, new_size); | |
999 | } | |
1000 | ||
1001 | out_unlock: | |
7d9eb12c | 1002 | mutex_unlock(&root->fs_info->volume_mutex); |
f46b5a66 CH |
1003 | kfree(vol_args); |
1004 | return ret; | |
1005 | } | |
1006 | ||
72fd032e SW |
1007 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
1008 | char *name, | |
1009 | unsigned long fd, | |
1010 | int subvol, | |
b83cc969 LZ |
1011 | u64 *transid, |
1012 | bool readonly) | |
f46b5a66 | 1013 | { |
cb8e7090 | 1014 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
3de4586c | 1015 | struct file *src_file; |
f46b5a66 | 1016 | int namelen; |
3de4586c | 1017 | int ret = 0; |
f46b5a66 | 1018 | |
c146afad YZ |
1019 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1020 | return -EROFS; | |
1021 | ||
72fd032e SW |
1022 | namelen = strlen(name); |
1023 | if (strchr(name, '/')) { | |
f46b5a66 CH |
1024 | ret = -EINVAL; |
1025 | goto out; | |
1026 | } | |
1027 | ||
3de4586c | 1028 | if (subvol) { |
72fd032e | 1029 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
b83cc969 | 1030 | NULL, transid, readonly); |
cb8e7090 | 1031 | } else { |
3de4586c | 1032 | struct inode *src_inode; |
72fd032e | 1033 | src_file = fget(fd); |
3de4586c CM |
1034 | if (!src_file) { |
1035 | ret = -EINVAL; | |
1036 | goto out; | |
1037 | } | |
1038 | ||
1039 | src_inode = src_file->f_path.dentry->d_inode; | |
1040 | if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { | |
d397712b CM |
1041 | printk(KERN_INFO "btrfs: Snapshot src from " |
1042 | "another FS\n"); | |
3de4586c CM |
1043 | ret = -EINVAL; |
1044 | fput(src_file); | |
1045 | goto out; | |
1046 | } | |
72fd032e SW |
1047 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
1048 | BTRFS_I(src_inode)->root, | |
b83cc969 | 1049 | transid, readonly); |
3de4586c | 1050 | fput(src_file); |
cb8e7090 | 1051 | } |
f46b5a66 | 1052 | out: |
72fd032e SW |
1053 | return ret; |
1054 | } | |
1055 | ||
1056 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1057 | void __user *arg, int subvol) |
72fd032e | 1058 | { |
fa0d2b9b | 1059 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1060 | int ret; |
1061 | ||
fa0d2b9b LZ |
1062 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1063 | if (IS_ERR(vol_args)) | |
1064 | return PTR_ERR(vol_args); | |
1065 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1066 | |
fa0d2b9b | 1067 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 LZ |
1068 | vol_args->fd, subvol, |
1069 | NULL, false); | |
fdfb1e4f | 1070 | |
fa0d2b9b LZ |
1071 | kfree(vol_args); |
1072 | return ret; | |
1073 | } | |
fdfb1e4f | 1074 | |
fa0d2b9b LZ |
1075 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1076 | void __user *arg, int subvol) | |
1077 | { | |
1078 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1079 | int ret; | |
1080 | u64 transid = 0; | |
1081 | u64 *ptr = NULL; | |
b83cc969 | 1082 | bool readonly = false; |
75eaa0e2 | 1083 | |
fa0d2b9b LZ |
1084 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1085 | if (IS_ERR(vol_args)) | |
1086 | return PTR_ERR(vol_args); | |
1087 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1088 | |
b83cc969 LZ |
1089 | if (vol_args->flags & |
1090 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { | |
1091 | ret = -EOPNOTSUPP; | |
fa0d2b9b | 1092 | goto out; |
72fd032e | 1093 | } |
fa0d2b9b LZ |
1094 | |
1095 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1096 | ptr = &transid; | |
b83cc969 LZ |
1097 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1098 | readonly = true; | |
fa0d2b9b LZ |
1099 | |
1100 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
b83cc969 LZ |
1101 | vol_args->fd, subvol, |
1102 | ptr, readonly); | |
fa0d2b9b LZ |
1103 | |
1104 | if (ret == 0 && ptr && | |
1105 | copy_to_user(arg + | |
1106 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1107 | transid), ptr, sizeof(*ptr))) | |
1108 | ret = -EFAULT; | |
fdfb1e4f | 1109 | out: |
f46b5a66 CH |
1110 | kfree(vol_args); |
1111 | return ret; | |
1112 | } | |
1113 | ||
0caa102d LZ |
1114 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1115 | void __user *arg) | |
1116 | { | |
1117 | struct inode *inode = fdentry(file)->d_inode; | |
1118 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1119 | int ret = 0; | |
1120 | u64 flags = 0; | |
1121 | ||
1122 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) | |
1123 | return -EINVAL; | |
1124 | ||
1125 | down_read(&root->fs_info->subvol_sem); | |
1126 | if (btrfs_root_readonly(root)) | |
1127 | flags |= BTRFS_SUBVOL_RDONLY; | |
1128 | up_read(&root->fs_info->subvol_sem); | |
1129 | ||
1130 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1131 | ret = -EFAULT; | |
1132 | ||
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1137 | void __user *arg) | |
1138 | { | |
1139 | struct inode *inode = fdentry(file)->d_inode; | |
1140 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1141 | struct btrfs_trans_handle *trans; | |
1142 | u64 root_flags; | |
1143 | u64 flags; | |
1144 | int ret = 0; | |
1145 | ||
1146 | if (root->fs_info->sb->s_flags & MS_RDONLY) | |
1147 | return -EROFS; | |
1148 | ||
1149 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) | |
1150 | return -EINVAL; | |
1151 | ||
1152 | if (copy_from_user(&flags, arg, sizeof(flags))) | |
1153 | return -EFAULT; | |
1154 | ||
b4dc2b8c | 1155 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) |
0caa102d LZ |
1156 | return -EINVAL; |
1157 | ||
1158 | if (flags & ~BTRFS_SUBVOL_RDONLY) | |
1159 | return -EOPNOTSUPP; | |
1160 | ||
b4dc2b8c LZ |
1161 | if (!is_owner_or_cap(inode)) |
1162 | return -EACCES; | |
1163 | ||
0caa102d LZ |
1164 | down_write(&root->fs_info->subvol_sem); |
1165 | ||
1166 | /* nothing to do */ | |
1167 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
1168 | goto out; | |
1169 | ||
1170 | root_flags = btrfs_root_flags(&root->root_item); | |
1171 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1172 | btrfs_set_root_flags(&root->root_item, | |
1173 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1174 | else | |
1175 | btrfs_set_root_flags(&root->root_item, | |
1176 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1177 | ||
1178 | trans = btrfs_start_transaction(root, 1); | |
1179 | if (IS_ERR(trans)) { | |
1180 | ret = PTR_ERR(trans); | |
1181 | goto out_reset; | |
1182 | } | |
1183 | ||
b4dc2b8c | 1184 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1185 | &root->root_key, &root->root_item); |
1186 | ||
1187 | btrfs_commit_transaction(trans, root); | |
1188 | out_reset: | |
1189 | if (ret) | |
1190 | btrfs_set_root_flags(&root->root_item, root_flags); | |
1191 | out: | |
1192 | up_write(&root->fs_info->subvol_sem); | |
1193 | return ret; | |
1194 | } | |
1195 | ||
76dda93c YZ |
1196 | /* |
1197 | * helper to check if the subvolume references other subvolumes | |
1198 | */ | |
1199 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1200 | { | |
1201 | struct btrfs_path *path; | |
1202 | struct btrfs_key key; | |
1203 | int ret; | |
1204 | ||
1205 | path = btrfs_alloc_path(); | |
1206 | if (!path) | |
1207 | return -ENOMEM; | |
1208 | ||
1209 | key.objectid = root->root_key.objectid; | |
1210 | key.type = BTRFS_ROOT_REF_KEY; | |
1211 | key.offset = (u64)-1; | |
1212 | ||
1213 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1214 | &key, path, 0, 0); | |
1215 | if (ret < 0) | |
1216 | goto out; | |
1217 | BUG_ON(ret == 0); | |
1218 | ||
1219 | ret = 0; | |
1220 | if (path->slots[0] > 0) { | |
1221 | path->slots[0]--; | |
1222 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1223 | if (key.objectid == root->root_key.objectid && | |
1224 | key.type == BTRFS_ROOT_REF_KEY) | |
1225 | ret = -ENOTEMPTY; | |
1226 | } | |
1227 | out: | |
1228 | btrfs_free_path(path); | |
1229 | return ret; | |
1230 | } | |
1231 | ||
ac8e9819 CM |
1232 | static noinline int key_in_sk(struct btrfs_key *key, |
1233 | struct btrfs_ioctl_search_key *sk) | |
1234 | { | |
abc6e134 CM |
1235 | struct btrfs_key test; |
1236 | int ret; | |
1237 | ||
1238 | test.objectid = sk->min_objectid; | |
1239 | test.type = sk->min_type; | |
1240 | test.offset = sk->min_offset; | |
1241 | ||
1242 | ret = btrfs_comp_cpu_keys(key, &test); | |
1243 | if (ret < 0) | |
ac8e9819 | 1244 | return 0; |
abc6e134 CM |
1245 | |
1246 | test.objectid = sk->max_objectid; | |
1247 | test.type = sk->max_type; | |
1248 | test.offset = sk->max_offset; | |
1249 | ||
1250 | ret = btrfs_comp_cpu_keys(key, &test); | |
1251 | if (ret > 0) | |
ac8e9819 CM |
1252 | return 0; |
1253 | return 1; | |
1254 | } | |
1255 | ||
1256 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1257 | struct btrfs_path *path, | |
1258 | struct btrfs_key *key, | |
1259 | struct btrfs_ioctl_search_key *sk, | |
1260 | char *buf, | |
1261 | unsigned long *sk_offset, | |
1262 | int *num_found) | |
1263 | { | |
1264 | u64 found_transid; | |
1265 | struct extent_buffer *leaf; | |
1266 | struct btrfs_ioctl_search_header sh; | |
1267 | unsigned long item_off; | |
1268 | unsigned long item_len; | |
1269 | int nritems; | |
1270 | int i; | |
1271 | int slot; | |
1272 | int found = 0; | |
1273 | int ret = 0; | |
1274 | ||
1275 | leaf = path->nodes[0]; | |
1276 | slot = path->slots[0]; | |
1277 | nritems = btrfs_header_nritems(leaf); | |
1278 | ||
1279 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1280 | i = nritems; | |
1281 | goto advance_key; | |
1282 | } | |
1283 | found_transid = btrfs_header_generation(leaf); | |
1284 | ||
1285 | for (i = slot; i < nritems; i++) { | |
1286 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1287 | item_len = btrfs_item_size_nr(leaf, i); | |
1288 | ||
1289 | if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
1290 | item_len = 0; | |
1291 | ||
1292 | if (sizeof(sh) + item_len + *sk_offset > | |
1293 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1294 | ret = 1; | |
1295 | goto overflow; | |
1296 | } | |
1297 | ||
1298 | btrfs_item_key_to_cpu(leaf, key, i); | |
1299 | if (!key_in_sk(key, sk)) | |
1300 | continue; | |
1301 | ||
1302 | sh.objectid = key->objectid; | |
1303 | sh.offset = key->offset; | |
1304 | sh.type = key->type; | |
1305 | sh.len = item_len; | |
1306 | sh.transid = found_transid; | |
1307 | ||
1308 | /* copy search result header */ | |
1309 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1310 | *sk_offset += sizeof(sh); | |
1311 | ||
1312 | if (item_len) { | |
1313 | char *p = buf + *sk_offset; | |
1314 | /* copy the item */ | |
1315 | read_extent_buffer(leaf, p, | |
1316 | item_off, item_len); | |
1317 | *sk_offset += item_len; | |
ac8e9819 | 1318 | } |
90fdde14 | 1319 | found++; |
ac8e9819 CM |
1320 | |
1321 | if (*num_found >= sk->nr_items) | |
1322 | break; | |
1323 | } | |
1324 | advance_key: | |
abc6e134 CM |
1325 | ret = 0; |
1326 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1327 | key->offset++; |
abc6e134 CM |
1328 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1329 | key->offset = 0; | |
ac8e9819 | 1330 | key->type++; |
abc6e134 CM |
1331 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1332 | key->offset = 0; | |
1333 | key->type = 0; | |
ac8e9819 | 1334 | key->objectid++; |
abc6e134 CM |
1335 | } else |
1336 | ret = 1; | |
ac8e9819 CM |
1337 | overflow: |
1338 | *num_found += found; | |
1339 | return ret; | |
1340 | } | |
1341 | ||
1342 | static noinline int search_ioctl(struct inode *inode, | |
1343 | struct btrfs_ioctl_search_args *args) | |
1344 | { | |
1345 | struct btrfs_root *root; | |
1346 | struct btrfs_key key; | |
1347 | struct btrfs_key max_key; | |
1348 | struct btrfs_path *path; | |
1349 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1350 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1351 | int ret; | |
1352 | int num_found = 0; | |
1353 | unsigned long sk_offset = 0; | |
1354 | ||
1355 | path = btrfs_alloc_path(); | |
1356 | if (!path) | |
1357 | return -ENOMEM; | |
1358 | ||
1359 | if (sk->tree_id == 0) { | |
1360 | /* search the root of the inode that was passed */ | |
1361 | root = BTRFS_I(inode)->root; | |
1362 | } else { | |
1363 | key.objectid = sk->tree_id; | |
1364 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1365 | key.offset = (u64)-1; | |
1366 | root = btrfs_read_fs_root_no_name(info, &key); | |
1367 | if (IS_ERR(root)) { | |
1368 | printk(KERN_ERR "could not find root %llu\n", | |
1369 | sk->tree_id); | |
1370 | btrfs_free_path(path); | |
1371 | return -ENOENT; | |
1372 | } | |
1373 | } | |
1374 | ||
1375 | key.objectid = sk->min_objectid; | |
1376 | key.type = sk->min_type; | |
1377 | key.offset = sk->min_offset; | |
1378 | ||
1379 | max_key.objectid = sk->max_objectid; | |
1380 | max_key.type = sk->max_type; | |
1381 | max_key.offset = sk->max_offset; | |
1382 | ||
1383 | path->keep_locks = 1; | |
1384 | ||
1385 | while(1) { | |
1386 | ret = btrfs_search_forward(root, &key, &max_key, path, 0, | |
1387 | sk->min_transid); | |
1388 | if (ret != 0) { | |
1389 | if (ret > 0) | |
1390 | ret = 0; | |
1391 | goto err; | |
1392 | } | |
1393 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1394 | &sk_offset, &num_found); | |
1395 | btrfs_release_path(root, path); | |
1396 | if (ret || num_found >= sk->nr_items) | |
1397 | break; | |
1398 | ||
1399 | } | |
1400 | ret = 0; | |
1401 | err: | |
1402 | sk->nr_items = num_found; | |
1403 | btrfs_free_path(path); | |
1404 | return ret; | |
1405 | } | |
1406 | ||
1407 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1408 | void __user *argp) | |
1409 | { | |
1410 | struct btrfs_ioctl_search_args *args; | |
1411 | struct inode *inode; | |
1412 | int ret; | |
1413 | ||
1414 | if (!capable(CAP_SYS_ADMIN)) | |
1415 | return -EPERM; | |
1416 | ||
2354d08f JL |
1417 | args = memdup_user(argp, sizeof(*args)); |
1418 | if (IS_ERR(args)) | |
1419 | return PTR_ERR(args); | |
ac8e9819 | 1420 | |
ac8e9819 CM |
1421 | inode = fdentry(file)->d_inode; |
1422 | ret = search_ioctl(inode, args); | |
1423 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1424 | ret = -EFAULT; | |
1425 | kfree(args); | |
1426 | return ret; | |
1427 | } | |
1428 | ||
98d377a0 | 1429 | /* |
ac8e9819 CM |
1430 | * Search INODE_REFs to identify path name of 'dirid' directory |
1431 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1432 | */ | |
98d377a0 TH |
1433 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1434 | u64 tree_id, u64 dirid, char *name) | |
1435 | { | |
1436 | struct btrfs_root *root; | |
1437 | struct btrfs_key key; | |
ac8e9819 | 1438 | char *ptr; |
98d377a0 TH |
1439 | int ret = -1; |
1440 | int slot; | |
1441 | int len; | |
1442 | int total_len = 0; | |
1443 | struct btrfs_inode_ref *iref; | |
1444 | struct extent_buffer *l; | |
1445 | struct btrfs_path *path; | |
1446 | ||
1447 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1448 | name[0]='\0'; | |
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | path = btrfs_alloc_path(); | |
1453 | if (!path) | |
1454 | return -ENOMEM; | |
1455 | ||
ac8e9819 | 1456 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1457 | |
1458 | key.objectid = tree_id; | |
1459 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1460 | key.offset = (u64)-1; | |
1461 | root = btrfs_read_fs_root_no_name(info, &key); | |
1462 | if (IS_ERR(root)) { | |
1463 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
1464 | ret = -ENOENT; |
1465 | goto out; | |
98d377a0 TH |
1466 | } |
1467 | ||
1468 | key.objectid = dirid; | |
1469 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 1470 | key.offset = (u64)-1; |
98d377a0 TH |
1471 | |
1472 | while(1) { | |
1473 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1474 | if (ret < 0) | |
1475 | goto out; | |
1476 | ||
1477 | l = path->nodes[0]; | |
1478 | slot = path->slots[0]; | |
8ad6fcab CM |
1479 | if (ret > 0 && slot > 0) |
1480 | slot--; | |
98d377a0 TH |
1481 | btrfs_item_key_to_cpu(l, &key, slot); |
1482 | ||
1483 | if (ret > 0 && (key.objectid != dirid || | |
ac8e9819 CM |
1484 | key.type != BTRFS_INODE_REF_KEY)) { |
1485 | ret = -ENOENT; | |
98d377a0 | 1486 | goto out; |
ac8e9819 | 1487 | } |
98d377a0 TH |
1488 | |
1489 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); | |
1490 | len = btrfs_inode_ref_name_len(l, iref); | |
1491 | ptr -= len + 1; | |
1492 | total_len += len + 1; | |
ac8e9819 | 1493 | if (ptr < name) |
98d377a0 TH |
1494 | goto out; |
1495 | ||
1496 | *(ptr + len) = '/'; | |
1497 | read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); | |
1498 | ||
1499 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
1500 | break; | |
1501 | ||
1502 | btrfs_release_path(root, path); | |
1503 | key.objectid = key.offset; | |
8ad6fcab | 1504 | key.offset = (u64)-1; |
98d377a0 TH |
1505 | dirid = key.objectid; |
1506 | ||
1507 | } | |
ac8e9819 | 1508 | if (ptr < name) |
98d377a0 | 1509 | goto out; |
ac8e9819 | 1510 | memcpy(name, ptr, total_len); |
98d377a0 TH |
1511 | name[total_len]='\0'; |
1512 | ret = 0; | |
1513 | out: | |
1514 | btrfs_free_path(path); | |
ac8e9819 CM |
1515 | return ret; |
1516 | } | |
1517 | ||
1518 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
1519 | void __user *argp) | |
1520 | { | |
1521 | struct btrfs_ioctl_ino_lookup_args *args; | |
1522 | struct inode *inode; | |
1523 | int ret; | |
1524 | ||
1525 | if (!capable(CAP_SYS_ADMIN)) | |
1526 | return -EPERM; | |
1527 | ||
2354d08f JL |
1528 | args = memdup_user(argp, sizeof(*args)); |
1529 | if (IS_ERR(args)) | |
1530 | return PTR_ERR(args); | |
c2b96929 | 1531 | |
ac8e9819 CM |
1532 | inode = fdentry(file)->d_inode; |
1533 | ||
1b53ac4d CM |
1534 | if (args->treeid == 0) |
1535 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
1536 | ||
ac8e9819 CM |
1537 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
1538 | args->treeid, args->objectid, | |
1539 | args->name); | |
1540 | ||
1541 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1542 | ret = -EFAULT; | |
1543 | ||
1544 | kfree(args); | |
98d377a0 TH |
1545 | return ret; |
1546 | } | |
1547 | ||
76dda93c YZ |
1548 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
1549 | void __user *arg) | |
1550 | { | |
1551 | struct dentry *parent = fdentry(file); | |
1552 | struct dentry *dentry; | |
1553 | struct inode *dir = parent->d_inode; | |
1554 | struct inode *inode; | |
1555 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1556 | struct btrfs_root *dest = NULL; | |
1557 | struct btrfs_ioctl_vol_args *vol_args; | |
1558 | struct btrfs_trans_handle *trans; | |
1559 | int namelen; | |
1560 | int ret; | |
1561 | int err = 0; | |
1562 | ||
76dda93c YZ |
1563 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1564 | if (IS_ERR(vol_args)) | |
1565 | return PTR_ERR(vol_args); | |
1566 | ||
1567 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
1568 | namelen = strlen(vol_args->name); | |
1569 | if (strchr(vol_args->name, '/') || | |
1570 | strncmp(vol_args->name, "..", namelen) == 0) { | |
1571 | err = -EINVAL; | |
1572 | goto out; | |
1573 | } | |
1574 | ||
1575 | err = mnt_want_write(file->f_path.mnt); | |
1576 | if (err) | |
1577 | goto out; | |
1578 | ||
1579 | mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); | |
1580 | dentry = lookup_one_len(vol_args->name, parent, namelen); | |
1581 | if (IS_ERR(dentry)) { | |
1582 | err = PTR_ERR(dentry); | |
1583 | goto out_unlock_dir; | |
1584 | } | |
1585 | ||
1586 | if (!dentry->d_inode) { | |
1587 | err = -ENOENT; | |
1588 | goto out_dput; | |
1589 | } | |
1590 | ||
1591 | inode = dentry->d_inode; | |
4260f7c7 SW |
1592 | dest = BTRFS_I(inode)->root; |
1593 | if (!capable(CAP_SYS_ADMIN)){ | |
1594 | /* | |
1595 | * Regular user. Only allow this with a special mount | |
1596 | * option, when the user has write+exec access to the | |
1597 | * subvol root, and when rmdir(2) would have been | |
1598 | * allowed. | |
1599 | * | |
1600 | * Note that this is _not_ check that the subvol is | |
1601 | * empty or doesn't contain data that we wouldn't | |
1602 | * otherwise be able to delete. | |
1603 | * | |
1604 | * Users who want to delete empty subvols should try | |
1605 | * rmdir(2). | |
1606 | */ | |
1607 | err = -EPERM; | |
1608 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
1609 | goto out_dput; | |
1610 | ||
1611 | /* | |
1612 | * Do not allow deletion if the parent dir is the same | |
1613 | * as the dir to be deleted. That means the ioctl | |
1614 | * must be called on the dentry referencing the root | |
1615 | * of the subvol, not a random directory contained | |
1616 | * within it. | |
1617 | */ | |
1618 | err = -EINVAL; | |
1619 | if (root == dest) | |
1620 | goto out_dput; | |
1621 | ||
1622 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
1623 | if (err) | |
1624 | goto out_dput; | |
1625 | ||
1626 | /* check if subvolume may be deleted by a non-root user */ | |
1627 | err = btrfs_may_delete(dir, dentry, 1); | |
1628 | if (err) | |
1629 | goto out_dput; | |
1630 | } | |
1631 | ||
76dda93c YZ |
1632 | if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { |
1633 | err = -EINVAL; | |
1634 | goto out_dput; | |
1635 | } | |
1636 | ||
76dda93c YZ |
1637 | mutex_lock(&inode->i_mutex); |
1638 | err = d_invalidate(dentry); | |
1639 | if (err) | |
1640 | goto out_unlock; | |
1641 | ||
1642 | down_write(&root->fs_info->subvol_sem); | |
1643 | ||
1644 | err = may_destroy_subvol(dest); | |
1645 | if (err) | |
1646 | goto out_up_write; | |
1647 | ||
a22285a6 YZ |
1648 | trans = btrfs_start_transaction(root, 0); |
1649 | if (IS_ERR(trans)) { | |
1650 | err = PTR_ERR(trans); | |
d327099a | 1651 | goto out_up_write; |
a22285a6 YZ |
1652 | } |
1653 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
1654 | ||
76dda93c YZ |
1655 | ret = btrfs_unlink_subvol(trans, root, dir, |
1656 | dest->root_key.objectid, | |
1657 | dentry->d_name.name, | |
1658 | dentry->d_name.len); | |
1659 | BUG_ON(ret); | |
1660 | ||
1661 | btrfs_record_root_in_trans(trans, dest); | |
1662 | ||
1663 | memset(&dest->root_item.drop_progress, 0, | |
1664 | sizeof(dest->root_item.drop_progress)); | |
1665 | dest->root_item.drop_level = 0; | |
1666 | btrfs_set_root_refs(&dest->root_item, 0); | |
1667 | ||
d68fc57b YZ |
1668 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
1669 | ret = btrfs_insert_orphan_item(trans, | |
1670 | root->fs_info->tree_root, | |
1671 | dest->root_key.objectid); | |
1672 | BUG_ON(ret); | |
1673 | } | |
76dda93c | 1674 | |
531cb13f | 1675 | ret = btrfs_end_transaction(trans, root); |
76dda93c YZ |
1676 | BUG_ON(ret); |
1677 | inode->i_flags |= S_DEAD; | |
1678 | out_up_write: | |
1679 | up_write(&root->fs_info->subvol_sem); | |
1680 | out_unlock: | |
1681 | mutex_unlock(&inode->i_mutex); | |
1682 | if (!err) { | |
efefb143 | 1683 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
1684 | btrfs_invalidate_inodes(dest); |
1685 | d_delete(dentry); | |
1686 | } | |
1687 | out_dput: | |
1688 | dput(dentry); | |
1689 | out_unlock_dir: | |
1690 | mutex_unlock(&dir->i_mutex); | |
1691 | mnt_drop_write(file->f_path.mnt); | |
1692 | out: | |
1693 | kfree(vol_args); | |
1694 | return err; | |
1695 | } | |
1696 | ||
1e701a32 | 1697 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 CH |
1698 | { |
1699 | struct inode *inode = fdentry(file)->d_inode; | |
1700 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1e701a32 | 1701 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
1702 | int ret; |
1703 | ||
b83cc969 LZ |
1704 | if (btrfs_root_readonly(root)) |
1705 | return -EROFS; | |
1706 | ||
c146afad YZ |
1707 | ret = mnt_want_write(file->f_path.mnt); |
1708 | if (ret) | |
1709 | return ret; | |
f46b5a66 CH |
1710 | |
1711 | switch (inode->i_mode & S_IFMT) { | |
1712 | case S_IFDIR: | |
e441d54d CM |
1713 | if (!capable(CAP_SYS_ADMIN)) { |
1714 | ret = -EPERM; | |
1715 | goto out; | |
1716 | } | |
8929ecfa YZ |
1717 | ret = btrfs_defrag_root(root, 0); |
1718 | if (ret) | |
1719 | goto out; | |
1720 | ret = btrfs_defrag_root(root->fs_info->extent_root, 0); | |
f46b5a66 CH |
1721 | break; |
1722 | case S_IFREG: | |
e441d54d CM |
1723 | if (!(file->f_mode & FMODE_WRITE)) { |
1724 | ret = -EINVAL; | |
1725 | goto out; | |
1726 | } | |
1e701a32 CM |
1727 | |
1728 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
1729 | if (!range) { | |
1730 | ret = -ENOMEM; | |
1731 | goto out; | |
1732 | } | |
1733 | ||
1734 | if (argp) { | |
1735 | if (copy_from_user(range, argp, | |
1736 | sizeof(*range))) { | |
1737 | ret = -EFAULT; | |
1738 | kfree(range); | |
683be16e | 1739 | goto out; |
1e701a32 CM |
1740 | } |
1741 | /* compression requires us to start the IO */ | |
1742 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1743 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
1744 | range->extent_thresh = (u32)-1; | |
1745 | } | |
1746 | } else { | |
1747 | /* the rest are all set to zero by kzalloc */ | |
1748 | range->len = (u64)-1; | |
1749 | } | |
8929ecfa | 1750 | ret = btrfs_defrag_file(file, range); |
1e701a32 | 1751 | kfree(range); |
f46b5a66 | 1752 | break; |
8929ecfa YZ |
1753 | default: |
1754 | ret = -EINVAL; | |
f46b5a66 | 1755 | } |
e441d54d | 1756 | out: |
ab67b7c1 | 1757 | mnt_drop_write(file->f_path.mnt); |
e441d54d | 1758 | return ret; |
f46b5a66 CH |
1759 | } |
1760 | ||
b2950863 | 1761 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1762 | { |
1763 | struct btrfs_ioctl_vol_args *vol_args; | |
1764 | int ret; | |
1765 | ||
e441d54d CM |
1766 | if (!capable(CAP_SYS_ADMIN)) |
1767 | return -EPERM; | |
1768 | ||
dae7b665 LZ |
1769 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1770 | if (IS_ERR(vol_args)) | |
1771 | return PTR_ERR(vol_args); | |
f46b5a66 | 1772 | |
5516e595 | 1773 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1774 | ret = btrfs_init_new_device(root, vol_args->name); |
1775 | ||
f46b5a66 CH |
1776 | kfree(vol_args); |
1777 | return ret; | |
1778 | } | |
1779 | ||
b2950863 | 1780 | static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
1781 | { |
1782 | struct btrfs_ioctl_vol_args *vol_args; | |
1783 | int ret; | |
1784 | ||
e441d54d CM |
1785 | if (!capable(CAP_SYS_ADMIN)) |
1786 | return -EPERM; | |
1787 | ||
c146afad YZ |
1788 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
1789 | return -EROFS; | |
1790 | ||
dae7b665 LZ |
1791 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1792 | if (IS_ERR(vol_args)) | |
1793 | return PTR_ERR(vol_args); | |
f46b5a66 | 1794 | |
5516e595 | 1795 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
1796 | ret = btrfs_rm_device(root, vol_args->name); |
1797 | ||
f46b5a66 CH |
1798 | kfree(vol_args); |
1799 | return ret; | |
1800 | } | |
1801 | ||
76dda93c YZ |
1802 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, |
1803 | u64 off, u64 olen, u64 destoff) | |
f46b5a66 CH |
1804 | { |
1805 | struct inode *inode = fdentry(file)->d_inode; | |
1806 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1807 | struct file *src_file; | |
1808 | struct inode *src; | |
1809 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 1810 | struct btrfs_path *path; |
f46b5a66 | 1811 | struct extent_buffer *leaf; |
ae01a0ab YZ |
1812 | char *buf; |
1813 | struct btrfs_key key; | |
f46b5a66 CH |
1814 | u32 nritems; |
1815 | int slot; | |
ae01a0ab | 1816 | int ret; |
c5c9cd4d SW |
1817 | u64 len = olen; |
1818 | u64 bs = root->fs_info->sb->s_blocksize; | |
1819 | u64 hint_byte; | |
d20f7043 | 1820 | |
c5c9cd4d SW |
1821 | /* |
1822 | * TODO: | |
1823 | * - split compressed inline extents. annoying: we need to | |
1824 | * decompress into destination's address_space (the file offset | |
1825 | * may change, so source mapping won't do), then recompress (or | |
1826 | * otherwise reinsert) a subrange. | |
1827 | * - allow ranges within the same file to be cloned (provided | |
1828 | * they don't overlap)? | |
1829 | */ | |
1830 | ||
e441d54d | 1831 | /* the destination must be opened for writing */ |
2ebc3464 | 1832 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) |
e441d54d CM |
1833 | return -EINVAL; |
1834 | ||
b83cc969 LZ |
1835 | if (btrfs_root_readonly(root)) |
1836 | return -EROFS; | |
1837 | ||
c146afad YZ |
1838 | ret = mnt_want_write(file->f_path.mnt); |
1839 | if (ret) | |
1840 | return ret; | |
1841 | ||
c5c9cd4d | 1842 | src_file = fget(srcfd); |
ab67b7c1 YZ |
1843 | if (!src_file) { |
1844 | ret = -EBADF; | |
1845 | goto out_drop_write; | |
1846 | } | |
5dc64164 | 1847 | |
f46b5a66 CH |
1848 | src = src_file->f_dentry->d_inode; |
1849 | ||
c5c9cd4d SW |
1850 | ret = -EINVAL; |
1851 | if (src == inode) | |
1852 | goto out_fput; | |
1853 | ||
5dc64164 DR |
1854 | /* the src must be open for reading */ |
1855 | if (!(src_file->f_mode & FMODE_READ)) | |
1856 | goto out_fput; | |
1857 | ||
ae01a0ab YZ |
1858 | ret = -EISDIR; |
1859 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
1860 | goto out_fput; | |
1861 | ||
f46b5a66 | 1862 | ret = -EXDEV; |
ae01a0ab YZ |
1863 | if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) |
1864 | goto out_fput; | |
1865 | ||
1866 | ret = -ENOMEM; | |
1867 | buf = vmalloc(btrfs_level_size(root, 0)); | |
1868 | if (!buf) | |
1869 | goto out_fput; | |
1870 | ||
1871 | path = btrfs_alloc_path(); | |
1872 | if (!path) { | |
1873 | vfree(buf); | |
f46b5a66 | 1874 | goto out_fput; |
ae01a0ab YZ |
1875 | } |
1876 | path->reada = 2; | |
f46b5a66 CH |
1877 | |
1878 | if (inode < src) { | |
fccdae43 SW |
1879 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); |
1880 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 | 1881 | } else { |
fccdae43 SW |
1882 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); |
1883 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
f46b5a66 CH |
1884 | } |
1885 | ||
c5c9cd4d SW |
1886 | /* determine range to clone */ |
1887 | ret = -EINVAL; | |
2ebc3464 | 1888 | if (off + len > src->i_size || off + len < off) |
f46b5a66 | 1889 | goto out_unlock; |
c5c9cd4d SW |
1890 | if (len == 0) |
1891 | olen = len = src->i_size - off; | |
1892 | /* if we extend to eof, continue to block boundary */ | |
1893 | if (off + len == src->i_size) | |
2a6b8dae | 1894 | len = ALIGN(src->i_size, bs) - off; |
c5c9cd4d SW |
1895 | |
1896 | /* verify the end result is block aligned */ | |
2a6b8dae LZ |
1897 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || |
1898 | !IS_ALIGNED(destoff, bs)) | |
c5c9cd4d SW |
1899 | goto out_unlock; |
1900 | ||
f46b5a66 CH |
1901 | /* do any pending delalloc/csum calc on src, one way or |
1902 | another, and lock file content */ | |
1903 | while (1) { | |
31840ae1 | 1904 | struct btrfs_ordered_extent *ordered; |
c5c9cd4d | 1905 | lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
9a019196 SW |
1906 | ordered = btrfs_lookup_first_ordered_extent(src, off+len); |
1907 | if (!ordered && | |
1908 | !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, | |
1909 | EXTENT_DELALLOC, 0, NULL)) | |
f46b5a66 | 1910 | break; |
c5c9cd4d | 1911 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
ae01a0ab YZ |
1912 | if (ordered) |
1913 | btrfs_put_ordered_extent(ordered); | |
9a019196 | 1914 | btrfs_wait_ordered_range(src, off, len); |
f46b5a66 CH |
1915 | } |
1916 | ||
c5c9cd4d | 1917 | /* clone data */ |
f46b5a66 | 1918 | key.objectid = src->i_ino; |
ae01a0ab YZ |
1919 | key.type = BTRFS_EXTENT_DATA_KEY; |
1920 | key.offset = 0; | |
f46b5a66 CH |
1921 | |
1922 | while (1) { | |
1923 | /* | |
1924 | * note the key will change type as we walk through the | |
1925 | * tree. | |
1926 | */ | |
a22285a6 | 1927 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
f46b5a66 CH |
1928 | if (ret < 0) |
1929 | goto out; | |
1930 | ||
ae01a0ab YZ |
1931 | nritems = btrfs_header_nritems(path->nodes[0]); |
1932 | if (path->slots[0] >= nritems) { | |
f46b5a66 CH |
1933 | ret = btrfs_next_leaf(root, path); |
1934 | if (ret < 0) | |
1935 | goto out; | |
1936 | if (ret > 0) | |
1937 | break; | |
ae01a0ab | 1938 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
1939 | } |
1940 | leaf = path->nodes[0]; | |
1941 | slot = path->slots[0]; | |
f46b5a66 | 1942 | |
ae01a0ab | 1943 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 1944 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
f46b5a66 CH |
1945 | key.objectid != src->i_ino) |
1946 | break; | |
1947 | ||
c5c9cd4d SW |
1948 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
1949 | struct btrfs_file_extent_item *extent; | |
1950 | int type; | |
31840ae1 ZY |
1951 | u32 size; |
1952 | struct btrfs_key new_key; | |
c5c9cd4d SW |
1953 | u64 disko = 0, diskl = 0; |
1954 | u64 datao = 0, datal = 0; | |
1955 | u8 comp; | |
b5384d48 | 1956 | u64 endoff; |
31840ae1 ZY |
1957 | |
1958 | size = btrfs_item_size_nr(leaf, slot); | |
1959 | read_extent_buffer(leaf, buf, | |
1960 | btrfs_item_ptr_offset(leaf, slot), | |
1961 | size); | |
c5c9cd4d SW |
1962 | |
1963 | extent = btrfs_item_ptr(leaf, slot, | |
1964 | struct btrfs_file_extent_item); | |
1965 | comp = btrfs_file_extent_compression(leaf, extent); | |
1966 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
1967 | if (type == BTRFS_FILE_EXTENT_REG || |
1968 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
1969 | disko = btrfs_file_extent_disk_bytenr(leaf, |
1970 | extent); | |
1971 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
1972 | extent); | |
c5c9cd4d | 1973 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
1974 | datal = btrfs_file_extent_num_bytes(leaf, |
1975 | extent); | |
c5c9cd4d SW |
1976 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
1977 | /* take upper bound, may be compressed */ | |
1978 | datal = btrfs_file_extent_ram_bytes(leaf, | |
1979 | extent); | |
1980 | } | |
31840ae1 ZY |
1981 | btrfs_release_path(root, path); |
1982 | ||
050006a7 | 1983 | if (key.offset + datal <= off || |
c5c9cd4d SW |
1984 | key.offset >= off+len) |
1985 | goto next; | |
1986 | ||
31840ae1 ZY |
1987 | memcpy(&new_key, &key, sizeof(new_key)); |
1988 | new_key.objectid = inode->i_ino; | |
4d728ec7 LZ |
1989 | if (off <= key.offset) |
1990 | new_key.offset = key.offset + destoff - off; | |
1991 | else | |
1992 | new_key.offset = destoff; | |
31840ae1 | 1993 | |
a22285a6 YZ |
1994 | trans = btrfs_start_transaction(root, 1); |
1995 | if (IS_ERR(trans)) { | |
1996 | ret = PTR_ERR(trans); | |
1997 | goto out; | |
1998 | } | |
1999 | ||
c8a894d7 CM |
2000 | if (type == BTRFS_FILE_EXTENT_REG || |
2001 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a22285a6 YZ |
2002 | if (off > key.offset) { |
2003 | datao += off - key.offset; | |
2004 | datal -= off - key.offset; | |
2005 | } | |
2006 | ||
2007 | if (key.offset + datal > off + len) | |
2008 | datal = off + len - key.offset; | |
2009 | ||
2010 | ret = btrfs_drop_extents(trans, inode, | |
2011 | new_key.offset, | |
2012 | new_key.offset + datal, | |
2013 | &hint_byte, 1); | |
2014 | BUG_ON(ret); | |
2015 | ||
c5c9cd4d SW |
2016 | ret = btrfs_insert_empty_item(trans, root, path, |
2017 | &new_key, size); | |
a22285a6 | 2018 | BUG_ON(ret); |
c5c9cd4d SW |
2019 | |
2020 | leaf = path->nodes[0]; | |
2021 | slot = path->slots[0]; | |
2022 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2023 | btrfs_item_ptr_offset(leaf, slot), |
2024 | size); | |
ae01a0ab | 2025 | |
c5c9cd4d | 2026 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2027 | struct btrfs_file_extent_item); |
c5c9cd4d | 2028 | |
c5c9cd4d SW |
2029 | /* disko == 0 means it's a hole */ |
2030 | if (!disko) | |
2031 | datao = 0; | |
c5c9cd4d SW |
2032 | |
2033 | btrfs_set_file_extent_offset(leaf, extent, | |
2034 | datao); | |
2035 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2036 | datal); | |
2037 | if (disko) { | |
2038 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2039 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2040 | disko, diskl, 0, |
2041 | root->root_key.objectid, | |
2042 | inode->i_ino, | |
2043 | new_key.offset - datao); | |
31840ae1 | 2044 | BUG_ON(ret); |
f46b5a66 | 2045 | } |
c5c9cd4d SW |
2046 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2047 | u64 skip = 0; | |
2048 | u64 trim = 0; | |
2049 | if (off > key.offset) { | |
2050 | skip = off - key.offset; | |
2051 | new_key.offset += skip; | |
2052 | } | |
d397712b | 2053 | |
c5c9cd4d SW |
2054 | if (key.offset + datal > off+len) |
2055 | trim = key.offset + datal - (off+len); | |
d397712b | 2056 | |
c5c9cd4d | 2057 | if (comp && (skip || trim)) { |
c5c9cd4d | 2058 | ret = -EINVAL; |
a22285a6 | 2059 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
2060 | goto out; |
2061 | } | |
2062 | size -= skip + trim; | |
2063 | datal -= skip + trim; | |
a22285a6 YZ |
2064 | |
2065 | ret = btrfs_drop_extents(trans, inode, | |
2066 | new_key.offset, | |
2067 | new_key.offset + datal, | |
2068 | &hint_byte, 1); | |
2069 | BUG_ON(ret); | |
2070 | ||
c5c9cd4d SW |
2071 | ret = btrfs_insert_empty_item(trans, root, path, |
2072 | &new_key, size); | |
a22285a6 | 2073 | BUG_ON(ret); |
c5c9cd4d SW |
2074 | |
2075 | if (skip) { | |
d397712b CM |
2076 | u32 start = |
2077 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
2078 | memmove(buf+start, buf+start+skip, |
2079 | datal); | |
2080 | } | |
2081 | ||
2082 | leaf = path->nodes[0]; | |
2083 | slot = path->slots[0]; | |
2084 | write_extent_buffer(leaf, buf, | |
2085 | btrfs_item_ptr_offset(leaf, slot), | |
2086 | size); | |
2087 | inode_add_bytes(inode, datal); | |
f46b5a66 | 2088 | } |
c5c9cd4d SW |
2089 | |
2090 | btrfs_mark_buffer_dirty(leaf); | |
a22285a6 | 2091 | btrfs_release_path(root, path); |
c5c9cd4d | 2092 | |
a22285a6 | 2093 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
2094 | |
2095 | /* | |
2096 | * we round up to the block size at eof when | |
2097 | * determining which extents to clone above, | |
2098 | * but shouldn't round up the file size | |
2099 | */ | |
2100 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
2101 | if (endoff > destoff+olen) |
2102 | endoff = destoff+olen; | |
b5384d48 SW |
2103 | if (endoff > inode->i_size) |
2104 | btrfs_i_size_write(inode, endoff); | |
2105 | ||
a22285a6 YZ |
2106 | BTRFS_I(inode)->flags = BTRFS_I(src)->flags; |
2107 | ret = btrfs_update_inode(trans, root, inode); | |
2108 | BUG_ON(ret); | |
2109 | btrfs_end_transaction(trans, root); | |
2110 | } | |
d397712b | 2111 | next: |
31840ae1 | 2112 | btrfs_release_path(root, path); |
f46b5a66 | 2113 | key.offset++; |
f46b5a66 | 2114 | } |
f46b5a66 CH |
2115 | ret = 0; |
2116 | out: | |
ae01a0ab | 2117 | btrfs_release_path(root, path); |
c5c9cd4d | 2118 | unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); |
f46b5a66 CH |
2119 | out_unlock: |
2120 | mutex_unlock(&src->i_mutex); | |
2121 | mutex_unlock(&inode->i_mutex); | |
ae01a0ab YZ |
2122 | vfree(buf); |
2123 | btrfs_free_path(path); | |
f46b5a66 CH |
2124 | out_fput: |
2125 | fput(src_file); | |
ab67b7c1 YZ |
2126 | out_drop_write: |
2127 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 CH |
2128 | return ret; |
2129 | } | |
2130 | ||
7a865e8a | 2131 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
2132 | { |
2133 | struct btrfs_ioctl_clone_range_args args; | |
2134 | ||
7a865e8a | 2135 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
2136 | return -EFAULT; |
2137 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
2138 | args.src_length, args.dest_offset); | |
2139 | } | |
2140 | ||
f46b5a66 CH |
2141 | /* |
2142 | * there are many ways the trans_start and trans_end ioctls can lead | |
2143 | * to deadlocks. They should only be used by applications that | |
2144 | * basically own the machine, and have a very in depth understanding | |
2145 | * of all the possible deadlocks and enospc problems. | |
2146 | */ | |
b2950863 | 2147 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 CH |
2148 | { |
2149 | struct inode *inode = fdentry(file)->d_inode; | |
2150 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2151 | struct btrfs_trans_handle *trans; | |
1ab86aed | 2152 | int ret; |
f46b5a66 | 2153 | |
1ab86aed | 2154 | ret = -EPERM; |
df5b5520 | 2155 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 2156 | goto out; |
df5b5520 | 2157 | |
1ab86aed SW |
2158 | ret = -EINPROGRESS; |
2159 | if (file->private_data) | |
f46b5a66 | 2160 | goto out; |
9ca9ee09 | 2161 | |
b83cc969 LZ |
2162 | ret = -EROFS; |
2163 | if (btrfs_root_readonly(root)) | |
2164 | goto out; | |
2165 | ||
c146afad YZ |
2166 | ret = mnt_want_write(file->f_path.mnt); |
2167 | if (ret) | |
2168 | goto out; | |
2169 | ||
9ca9ee09 SW |
2170 | mutex_lock(&root->fs_info->trans_mutex); |
2171 | root->fs_info->open_ioctl_trans++; | |
2172 | mutex_unlock(&root->fs_info->trans_mutex); | |
2173 | ||
1ab86aed | 2174 | ret = -ENOMEM; |
9ca9ee09 | 2175 | trans = btrfs_start_ioctl_transaction(root, 0); |
abd30bb0 | 2176 | if (IS_ERR(trans)) |
1ab86aed SW |
2177 | goto out_drop; |
2178 | ||
2179 | file->private_data = trans; | |
2180 | return 0; | |
2181 | ||
2182 | out_drop: | |
2183 | mutex_lock(&root->fs_info->trans_mutex); | |
2184 | root->fs_info->open_ioctl_trans--; | |
2185 | mutex_unlock(&root->fs_info->trans_mutex); | |
2186 | mnt_drop_write(file->f_path.mnt); | |
f46b5a66 | 2187 | out: |
f46b5a66 CH |
2188 | return ret; |
2189 | } | |
2190 | ||
6ef5ed0d JB |
2191 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
2192 | { | |
2193 | struct inode *inode = fdentry(file)->d_inode; | |
2194 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2195 | struct btrfs_root *new_root; | |
2196 | struct btrfs_dir_item *di; | |
2197 | struct btrfs_trans_handle *trans; | |
2198 | struct btrfs_path *path; | |
2199 | struct btrfs_key location; | |
2200 | struct btrfs_disk_key disk_key; | |
2201 | struct btrfs_super_block *disk_super; | |
2202 | u64 features; | |
2203 | u64 objectid = 0; | |
2204 | u64 dir_id; | |
2205 | ||
2206 | if (!capable(CAP_SYS_ADMIN)) | |
2207 | return -EPERM; | |
2208 | ||
2209 | if (copy_from_user(&objectid, argp, sizeof(objectid))) | |
2210 | return -EFAULT; | |
2211 | ||
2212 | if (!objectid) | |
2213 | objectid = root->root_key.objectid; | |
2214 | ||
2215 | location.objectid = objectid; | |
2216 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2217 | location.offset = (u64)-1; | |
2218 | ||
2219 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
2220 | if (IS_ERR(new_root)) | |
2221 | return PTR_ERR(new_root); | |
2222 | ||
2223 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
2224 | return -ENOENT; | |
2225 | ||
2226 | path = btrfs_alloc_path(); | |
2227 | if (!path) | |
2228 | return -ENOMEM; | |
2229 | path->leave_spinning = 1; | |
2230 | ||
2231 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 2232 | if (IS_ERR(trans)) { |
6ef5ed0d | 2233 | btrfs_free_path(path); |
98d5dc13 | 2234 | return PTR_ERR(trans); |
6ef5ed0d JB |
2235 | } |
2236 | ||
2237 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
2238 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, | |
2239 | dir_id, "default", 7, 1); | |
cf1e99a4 | 2240 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
2241 | btrfs_free_path(path); |
2242 | btrfs_end_transaction(trans, root); | |
2243 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
2244 | "this isn't going to work\n"); | |
2245 | return -ENOENT; | |
2246 | } | |
2247 | ||
2248 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
2249 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
2250 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2251 | btrfs_free_path(path); | |
2252 | ||
2253 | disk_super = &root->fs_info->super_copy; | |
2254 | features = btrfs_super_incompat_flags(disk_super); | |
2255 | if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { | |
2256 | features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; | |
2257 | btrfs_set_super_incompat_flags(disk_super, features); | |
2258 | } | |
2259 | btrfs_end_transaction(trans, root); | |
2260 | ||
2261 | return 0; | |
2262 | } | |
2263 | ||
bf5fc093 JB |
2264 | static void get_block_group_info(struct list_head *groups_list, |
2265 | struct btrfs_ioctl_space_info *space) | |
2266 | { | |
2267 | struct btrfs_block_group_cache *block_group; | |
2268 | ||
2269 | space->total_bytes = 0; | |
2270 | space->used_bytes = 0; | |
2271 | space->flags = 0; | |
2272 | list_for_each_entry(block_group, groups_list, list) { | |
2273 | space->flags = block_group->flags; | |
2274 | space->total_bytes += block_group->key.offset; | |
2275 | space->used_bytes += | |
2276 | btrfs_block_group_used(&block_group->item); | |
2277 | } | |
2278 | } | |
2279 | ||
1406e432 JB |
2280 | long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
2281 | { | |
2282 | struct btrfs_ioctl_space_args space_args; | |
2283 | struct btrfs_ioctl_space_info space; | |
2284 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf CM |
2285 | struct btrfs_ioctl_space_info *dest_orig; |
2286 | struct btrfs_ioctl_space_info *user_dest; | |
1406e432 | 2287 | struct btrfs_space_info *info; |
bf5fc093 JB |
2288 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
2289 | BTRFS_BLOCK_GROUP_SYSTEM, | |
2290 | BTRFS_BLOCK_GROUP_METADATA, | |
2291 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
2292 | int num_types = 4; | |
7fde62bf | 2293 | int alloc_size; |
1406e432 | 2294 | int ret = 0; |
51788b1b | 2295 | u64 slot_count = 0; |
bf5fc093 | 2296 | int i, c; |
1406e432 JB |
2297 | |
2298 | if (copy_from_user(&space_args, | |
2299 | (struct btrfs_ioctl_space_args __user *)arg, | |
2300 | sizeof(space_args))) | |
2301 | return -EFAULT; | |
2302 | ||
bf5fc093 JB |
2303 | for (i = 0; i < num_types; i++) { |
2304 | struct btrfs_space_info *tmp; | |
2305 | ||
2306 | info = NULL; | |
2307 | rcu_read_lock(); | |
2308 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2309 | list) { | |
2310 | if (tmp->flags == types[i]) { | |
2311 | info = tmp; | |
2312 | break; | |
2313 | } | |
2314 | } | |
2315 | rcu_read_unlock(); | |
2316 | ||
2317 | if (!info) | |
2318 | continue; | |
2319 | ||
2320 | down_read(&info->groups_sem); | |
2321 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2322 | if (!list_empty(&info->block_groups[c])) | |
2323 | slot_count++; | |
2324 | } | |
2325 | up_read(&info->groups_sem); | |
2326 | } | |
7fde62bf CM |
2327 | |
2328 | /* space_slots == 0 means they are asking for a count */ | |
2329 | if (space_args.space_slots == 0) { | |
2330 | space_args.total_spaces = slot_count; | |
2331 | goto out; | |
2332 | } | |
bf5fc093 | 2333 | |
51788b1b | 2334 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 2335 | |
7fde62bf | 2336 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 2337 | |
7fde62bf CM |
2338 | /* we generally have at most 6 or so space infos, one for each raid |
2339 | * level. So, a whole page should be more than enough for everyone | |
2340 | */ | |
2341 | if (alloc_size > PAGE_CACHE_SIZE) | |
2342 | return -ENOMEM; | |
2343 | ||
1406e432 | 2344 | space_args.total_spaces = 0; |
7fde62bf CM |
2345 | dest = kmalloc(alloc_size, GFP_NOFS); |
2346 | if (!dest) | |
2347 | return -ENOMEM; | |
2348 | dest_orig = dest; | |
1406e432 | 2349 | |
7fde62bf | 2350 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
2351 | for (i = 0; i < num_types; i++) { |
2352 | struct btrfs_space_info *tmp; | |
2353 | ||
51788b1b DR |
2354 | if (!slot_count) |
2355 | break; | |
2356 | ||
bf5fc093 JB |
2357 | info = NULL; |
2358 | rcu_read_lock(); | |
2359 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
2360 | list) { | |
2361 | if (tmp->flags == types[i]) { | |
2362 | info = tmp; | |
2363 | break; | |
2364 | } | |
2365 | } | |
2366 | rcu_read_unlock(); | |
7fde62bf | 2367 | |
bf5fc093 JB |
2368 | if (!info) |
2369 | continue; | |
2370 | down_read(&info->groups_sem); | |
2371 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
2372 | if (!list_empty(&info->block_groups[c])) { | |
2373 | get_block_group_info(&info->block_groups[c], | |
2374 | &space); | |
2375 | memcpy(dest, &space, sizeof(space)); | |
2376 | dest++; | |
2377 | space_args.total_spaces++; | |
51788b1b | 2378 | slot_count--; |
bf5fc093 | 2379 | } |
51788b1b DR |
2380 | if (!slot_count) |
2381 | break; | |
bf5fc093 JB |
2382 | } |
2383 | up_read(&info->groups_sem); | |
1406e432 | 2384 | } |
1406e432 | 2385 | |
7fde62bf CM |
2386 | user_dest = (struct btrfs_ioctl_space_info *) |
2387 | (arg + sizeof(struct btrfs_ioctl_space_args)); | |
2388 | ||
2389 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
2390 | ret = -EFAULT; | |
2391 | ||
2392 | kfree(dest_orig); | |
2393 | out: | |
2394 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
2395 | ret = -EFAULT; |
2396 | ||
2397 | return ret; | |
2398 | } | |
2399 | ||
f46b5a66 CH |
2400 | /* |
2401 | * there are many ways the trans_start and trans_end ioctls can lead | |
2402 | * to deadlocks. They should only be used by applications that | |
2403 | * basically own the machine, and have a very in depth understanding | |
2404 | * of all the possible deadlocks and enospc problems. | |
2405 | */ | |
2406 | long btrfs_ioctl_trans_end(struct file *file) | |
2407 | { | |
2408 | struct inode *inode = fdentry(file)->d_inode; | |
2409 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2410 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 2411 | |
f46b5a66 | 2412 | trans = file->private_data; |
1ab86aed SW |
2413 | if (!trans) |
2414 | return -EINVAL; | |
b214107e | 2415 | file->private_data = NULL; |
9ca9ee09 | 2416 | |
1ab86aed SW |
2417 | btrfs_end_transaction(trans, root); |
2418 | ||
9ca9ee09 SW |
2419 | mutex_lock(&root->fs_info->trans_mutex); |
2420 | root->fs_info->open_ioctl_trans--; | |
2421 | mutex_unlock(&root->fs_info->trans_mutex); | |
2422 | ||
cfc8ea87 | 2423 | mnt_drop_write(file->f_path.mnt); |
1ab86aed | 2424 | return 0; |
f46b5a66 CH |
2425 | } |
2426 | ||
46204592 SW |
2427 | static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) |
2428 | { | |
2429 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
2430 | struct btrfs_trans_handle *trans; | |
2431 | u64 transid; | |
db5b493a | 2432 | int ret; |
46204592 SW |
2433 | |
2434 | trans = btrfs_start_transaction(root, 0); | |
98d5dc13 TI |
2435 | if (IS_ERR(trans)) |
2436 | return PTR_ERR(trans); | |
46204592 | 2437 | transid = trans->transid; |
db5b493a | 2438 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
2439 | if (ret) { |
2440 | btrfs_end_transaction(trans, root); | |
db5b493a | 2441 | return ret; |
8b2b2d3c | 2442 | } |
46204592 SW |
2443 | |
2444 | if (argp) | |
2445 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
2446 | return -EFAULT; | |
2447 | return 0; | |
2448 | } | |
2449 | ||
2450 | static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) | |
2451 | { | |
2452 | struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; | |
2453 | u64 transid; | |
2454 | ||
2455 | if (argp) { | |
2456 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
2457 | return -EFAULT; | |
2458 | } else { | |
2459 | transid = 0; /* current trans */ | |
2460 | } | |
2461 | return btrfs_wait_for_commit(root, transid); | |
2462 | } | |
2463 | ||
f46b5a66 CH |
2464 | long btrfs_ioctl(struct file *file, unsigned int |
2465 | cmd, unsigned long arg) | |
2466 | { | |
2467 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; | |
4bcabaa3 | 2468 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
2469 | |
2470 | switch (cmd) { | |
6cbff00f CH |
2471 | case FS_IOC_GETFLAGS: |
2472 | return btrfs_ioctl_getflags(file, argp); | |
2473 | case FS_IOC_SETFLAGS: | |
2474 | return btrfs_ioctl_setflags(file, argp); | |
2475 | case FS_IOC_GETVERSION: | |
2476 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
2477 | case FITRIM: |
2478 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 2479 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 2480 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 2481 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 2482 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 2483 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 2484 | return btrfs_ioctl_snap_create(file, argp, 1); |
76dda93c YZ |
2485 | case BTRFS_IOC_SNAP_DESTROY: |
2486 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
2487 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
2488 | return btrfs_ioctl_subvol_getflags(file, argp); | |
2489 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
2490 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
2491 | case BTRFS_IOC_DEFAULT_SUBVOL: |
2492 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 2493 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
2494 | return btrfs_ioctl_defrag(file, NULL); |
2495 | case BTRFS_IOC_DEFRAG_RANGE: | |
2496 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 2497 | case BTRFS_IOC_RESIZE: |
4bcabaa3 | 2498 | return btrfs_ioctl_resize(root, argp); |
f46b5a66 | 2499 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 2500 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 2501 | case BTRFS_IOC_RM_DEV: |
4bcabaa3 | 2502 | return btrfs_ioctl_rm_dev(root, argp); |
f46b5a66 CH |
2503 | case BTRFS_IOC_BALANCE: |
2504 | return btrfs_balance(root->fs_info->dev_root); | |
2505 | case BTRFS_IOC_CLONE: | |
c5c9cd4d SW |
2506 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
2507 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 2508 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
2509 | case BTRFS_IOC_TRANS_START: |
2510 | return btrfs_ioctl_trans_start(file); | |
2511 | case BTRFS_IOC_TRANS_END: | |
2512 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
2513 | case BTRFS_IOC_TREE_SEARCH: |
2514 | return btrfs_ioctl_tree_search(file, argp); | |
2515 | case BTRFS_IOC_INO_LOOKUP: | |
2516 | return btrfs_ioctl_ino_lookup(file, argp); | |
1406e432 JB |
2517 | case BTRFS_IOC_SPACE_INFO: |
2518 | return btrfs_ioctl_space_info(root, argp); | |
f46b5a66 CH |
2519 | case BTRFS_IOC_SYNC: |
2520 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
2521 | return 0; | |
46204592 SW |
2522 | case BTRFS_IOC_START_SYNC: |
2523 | return btrfs_ioctl_start_sync(file, argp); | |
2524 | case BTRFS_IOC_WAIT_SYNC: | |
2525 | return btrfs_ioctl_wait_sync(file, argp); | |
f46b5a66 CH |
2526 | } |
2527 | ||
2528 | return -ENOTTY; | |
2529 | } |