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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> |
8ea05e3a | 44 | #include <linux/uuid.h> |
55e301fd | 45 | #include <linux/btrfs.h> |
416161db | 46 | #include <linux/uaccess.h> |
f46b5a66 CH |
47 | #include "ctree.h" |
48 | #include "disk-io.h" | |
49 | #include "transaction.h" | |
50 | #include "btrfs_inode.h" | |
f46b5a66 CH |
51 | #include "print-tree.h" |
52 | #include "volumes.h" | |
925baedd | 53 | #include "locking.h" |
581bb050 | 54 | #include "inode-map.h" |
d7728c96 | 55 | #include "backref.h" |
606686ee | 56 | #include "rcu-string.h" |
31db9f7c | 57 | #include "send.h" |
3f6bcfbd | 58 | #include "dev-replace.h" |
f46b5a66 | 59 | |
416161db MF |
60 | static int btrfs_clone(struct inode *src, struct inode *inode, |
61 | u64 off, u64 olen, u64 olen_aligned, u64 destoff); | |
62 | ||
6cbff00f CH |
63 | /* Mask out flags that are inappropriate for the given type of inode. */ |
64 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
65 | { | |
66 | if (S_ISDIR(mode)) | |
67 | return flags; | |
68 | else if (S_ISREG(mode)) | |
69 | return flags & ~FS_DIRSYNC_FL; | |
70 | else | |
71 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
72 | } | |
73 | ||
74 | /* | |
75 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
76 | */ | |
77 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
78 | { | |
79 | unsigned int iflags = 0; | |
80 | ||
81 | if (flags & BTRFS_INODE_SYNC) | |
82 | iflags |= FS_SYNC_FL; | |
83 | if (flags & BTRFS_INODE_IMMUTABLE) | |
84 | iflags |= FS_IMMUTABLE_FL; | |
85 | if (flags & BTRFS_INODE_APPEND) | |
86 | iflags |= FS_APPEND_FL; | |
87 | if (flags & BTRFS_INODE_NODUMP) | |
88 | iflags |= FS_NODUMP_FL; | |
89 | if (flags & BTRFS_INODE_NOATIME) | |
90 | iflags |= FS_NOATIME_FL; | |
91 | if (flags & BTRFS_INODE_DIRSYNC) | |
92 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
93 | if (flags & BTRFS_INODE_NODATACOW) |
94 | iflags |= FS_NOCOW_FL; | |
95 | ||
96 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
97 | iflags |= FS_COMPR_FL; | |
98 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
99 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
100 | |
101 | return iflags; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Update inode->i_flags based on the btrfs internal flags. | |
106 | */ | |
107 | void btrfs_update_iflags(struct inode *inode) | |
108 | { | |
109 | struct btrfs_inode *ip = BTRFS_I(inode); | |
110 | ||
111 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
112 | ||
113 | if (ip->flags & BTRFS_INODE_SYNC) | |
114 | inode->i_flags |= S_SYNC; | |
115 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
116 | inode->i_flags |= S_IMMUTABLE; | |
117 | if (ip->flags & BTRFS_INODE_APPEND) | |
118 | inode->i_flags |= S_APPEND; | |
119 | if (ip->flags & BTRFS_INODE_NOATIME) | |
120 | inode->i_flags |= S_NOATIME; | |
121 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
122 | inode->i_flags |= S_DIRSYNC; | |
123 | } | |
124 | ||
125 | /* | |
126 | * Inherit flags from the parent inode. | |
127 | * | |
e27425d6 | 128 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
129 | */ |
130 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
131 | { | |
0b4dcea5 CM |
132 | unsigned int flags; |
133 | ||
134 | if (!dir) | |
135 | return; | |
136 | ||
137 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 138 | |
e27425d6 JB |
139 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
140 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
141 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
142 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
143 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
144 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
145 | } | |
146 | ||
213490b3 | 147 | if (flags & BTRFS_INODE_NODATACOW) { |
e27425d6 | 148 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
213490b3 LB |
149 | if (S_ISREG(inode->i_mode)) |
150 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
151 | } | |
6cbff00f | 152 | |
6cbff00f CH |
153 | btrfs_update_iflags(inode); |
154 | } | |
155 | ||
156 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
157 | { | |
496ad9aa | 158 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
159 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
160 | ||
161 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
162 | return -EFAULT; | |
163 | return 0; | |
164 | } | |
165 | ||
75e7cb7f LB |
166 | static int check_flags(unsigned int flags) |
167 | { | |
168 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
169 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
170 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
171 | FS_NOCOMP_FL | FS_COMPR_FL | |
172 | FS_NOCOW_FL)) | |
75e7cb7f LB |
173 | return -EOPNOTSUPP; |
174 | ||
175 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
176 | return -EINVAL; | |
177 | ||
75e7cb7f LB |
178 | return 0; |
179 | } | |
180 | ||
6cbff00f CH |
181 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
182 | { | |
496ad9aa | 183 | struct inode *inode = file_inode(file); |
6cbff00f CH |
184 | struct btrfs_inode *ip = BTRFS_I(inode); |
185 | struct btrfs_root *root = ip->root; | |
186 | struct btrfs_trans_handle *trans; | |
187 | unsigned int flags, oldflags; | |
188 | int ret; | |
f062abf0 LZ |
189 | u64 ip_oldflags; |
190 | unsigned int i_oldflags; | |
7e97b8da | 191 | umode_t mode; |
6cbff00f | 192 | |
b83cc969 LZ |
193 | if (btrfs_root_readonly(root)) |
194 | return -EROFS; | |
195 | ||
6cbff00f CH |
196 | if (copy_from_user(&flags, arg, sizeof(flags))) |
197 | return -EFAULT; | |
198 | ||
75e7cb7f LB |
199 | ret = check_flags(flags); |
200 | if (ret) | |
201 | return ret; | |
f46b5a66 | 202 | |
2e149670 | 203 | if (!inode_owner_or_capable(inode)) |
6cbff00f CH |
204 | return -EACCES; |
205 | ||
e7848683 JK |
206 | ret = mnt_want_write_file(file); |
207 | if (ret) | |
208 | return ret; | |
209 | ||
6cbff00f CH |
210 | mutex_lock(&inode->i_mutex); |
211 | ||
f062abf0 LZ |
212 | ip_oldflags = ip->flags; |
213 | i_oldflags = inode->i_flags; | |
7e97b8da | 214 | mode = inode->i_mode; |
f062abf0 | 215 | |
6cbff00f CH |
216 | flags = btrfs_mask_flags(inode->i_mode, flags); |
217 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
218 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
219 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
220 | ret = -EPERM; | |
221 | goto out_unlock; | |
222 | } | |
223 | } | |
224 | ||
6cbff00f CH |
225 | if (flags & FS_SYNC_FL) |
226 | ip->flags |= BTRFS_INODE_SYNC; | |
227 | else | |
228 | ip->flags &= ~BTRFS_INODE_SYNC; | |
229 | if (flags & FS_IMMUTABLE_FL) | |
230 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
231 | else | |
232 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
233 | if (flags & FS_APPEND_FL) | |
234 | ip->flags |= BTRFS_INODE_APPEND; | |
235 | else | |
236 | ip->flags &= ~BTRFS_INODE_APPEND; | |
237 | if (flags & FS_NODUMP_FL) | |
238 | ip->flags |= BTRFS_INODE_NODUMP; | |
239 | else | |
240 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
241 | if (flags & FS_NOATIME_FL) | |
242 | ip->flags |= BTRFS_INODE_NOATIME; | |
243 | else | |
244 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
245 | if (flags & FS_DIRSYNC_FL) | |
246 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
247 | else | |
248 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
249 | if (flags & FS_NOCOW_FL) { |
250 | if (S_ISREG(mode)) { | |
251 | /* | |
252 | * It's safe to turn csums off here, no extents exist. | |
253 | * Otherwise we want the flag to reflect the real COW | |
254 | * status of the file and will not set it. | |
255 | */ | |
256 | if (inode->i_size == 0) | |
257 | ip->flags |= BTRFS_INODE_NODATACOW | |
258 | | BTRFS_INODE_NODATASUM; | |
259 | } else { | |
260 | ip->flags |= BTRFS_INODE_NODATACOW; | |
261 | } | |
262 | } else { | |
263 | /* | |
264 | * Revert back under same assuptions as above | |
265 | */ | |
266 | if (S_ISREG(mode)) { | |
267 | if (inode->i_size == 0) | |
268 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
269 | | BTRFS_INODE_NODATASUM); | |
270 | } else { | |
271 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
272 | } | |
273 | } | |
6cbff00f | 274 | |
75e7cb7f LB |
275 | /* |
276 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
277 | * flag may be changed automatically if compression code won't make | |
278 | * things smaller. | |
279 | */ | |
280 | if (flags & FS_NOCOMP_FL) { | |
281 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
282 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
283 | } else if (flags & FS_COMPR_FL) { | |
284 | ip->flags |= BTRFS_INODE_COMPRESS; | |
285 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
ebcb904d LZ |
286 | } else { |
287 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); | |
75e7cb7f | 288 | } |
6cbff00f | 289 | |
4da6f1a3 | 290 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
291 | if (IS_ERR(trans)) { |
292 | ret = PTR_ERR(trans); | |
293 | goto out_drop; | |
294 | } | |
6cbff00f | 295 | |
306424cc | 296 | btrfs_update_iflags(inode); |
0c4d2d95 | 297 | inode_inc_iversion(inode); |
306424cc | 298 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 299 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 300 | |
6cbff00f | 301 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
302 | out_drop: |
303 | if (ret) { | |
304 | ip->flags = ip_oldflags; | |
305 | inode->i_flags = i_oldflags; | |
306 | } | |
6cbff00f | 307 | |
6cbff00f CH |
308 | out_unlock: |
309 | mutex_unlock(&inode->i_mutex); | |
e7848683 | 310 | mnt_drop_write_file(file); |
2d4e6f6a | 311 | return ret; |
6cbff00f CH |
312 | } |
313 | ||
314 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
315 | { | |
496ad9aa | 316 | struct inode *inode = file_inode(file); |
6cbff00f CH |
317 | |
318 | return put_user(inode->i_generation, arg); | |
319 | } | |
f46b5a66 | 320 | |
f7039b1d LD |
321 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
322 | { | |
54563d41 | 323 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
f7039b1d LD |
324 | struct btrfs_device *device; |
325 | struct request_queue *q; | |
326 | struct fstrim_range range; | |
327 | u64 minlen = ULLONG_MAX; | |
328 | u64 num_devices = 0; | |
815745cf | 329 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
330 | int ret; |
331 | ||
332 | if (!capable(CAP_SYS_ADMIN)) | |
333 | return -EPERM; | |
334 | ||
1f78160c XG |
335 | rcu_read_lock(); |
336 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
337 | dev_list) { | |
f7039b1d LD |
338 | if (!device->bdev) |
339 | continue; | |
340 | q = bdev_get_queue(device->bdev); | |
341 | if (blk_queue_discard(q)) { | |
342 | num_devices++; | |
343 | minlen = min((u64)q->limits.discard_granularity, | |
344 | minlen); | |
345 | } | |
346 | } | |
1f78160c | 347 | rcu_read_unlock(); |
f4c697e6 | 348 | |
f7039b1d LD |
349 | if (!num_devices) |
350 | return -EOPNOTSUPP; | |
f7039b1d LD |
351 | if (copy_from_user(&range, arg, sizeof(range))) |
352 | return -EFAULT; | |
e515c18b LC |
353 | if (range.start > total_bytes || |
354 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 355 | return -EINVAL; |
f7039b1d | 356 | |
f4c697e6 | 357 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 358 | range.minlen = max(range.minlen, minlen); |
815745cf | 359 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
360 | if (ret < 0) |
361 | return ret; | |
362 | ||
363 | if (copy_to_user(arg, &range, sizeof(range))) | |
364 | return -EFAULT; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
dd5f9615 SB |
369 | int btrfs_is_empty_uuid(u8 *uuid) |
370 | { | |
46e0f66a CM |
371 | int i; |
372 | ||
373 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
374 | if (uuid[i]) | |
375 | return 0; | |
376 | } | |
377 | return 1; | |
dd5f9615 SB |
378 | } |
379 | ||
d5c12070 | 380 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 381 | struct dentry *dentry, |
72fd032e | 382 | char *name, int namelen, |
6f72c7e2 | 383 | u64 *async_transid, |
8696c533 | 384 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 CH |
385 | { |
386 | struct btrfs_trans_handle *trans; | |
387 | struct btrfs_key key; | |
388 | struct btrfs_root_item root_item; | |
389 | struct btrfs_inode_item *inode_item; | |
390 | struct extent_buffer *leaf; | |
d5c12070 | 391 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 392 | struct btrfs_root *new_root; |
d5c12070 | 393 | struct btrfs_block_rsv block_rsv; |
8ea05e3a | 394 | struct timespec cur_time = CURRENT_TIME; |
f46b5a66 CH |
395 | int ret; |
396 | int err; | |
397 | u64 objectid; | |
398 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 399 | u64 index = 0; |
d5c12070 | 400 | u64 qgroup_reserved; |
8ea05e3a | 401 | uuid_le new_uuid; |
f46b5a66 | 402 | |
581bb050 | 403 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 404 | if (ret) |
a22285a6 | 405 | return ret; |
6a912213 | 406 | |
d5c12070 | 407 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 408 | /* |
d5c12070 MX |
409 | * The same as the snapshot creation, please see the comment |
410 | * of create_snapshot(). | |
9ed74f2d | 411 | */ |
d5c12070 | 412 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
dd5f9615 | 413 | 8, &qgroup_reserved, false); |
d5c12070 MX |
414 | if (ret) |
415 | return ret; | |
416 | ||
417 | trans = btrfs_start_transaction(root, 0); | |
418 | if (IS_ERR(trans)) { | |
419 | ret = PTR_ERR(trans); | |
420 | goto out; | |
421 | } | |
422 | trans->block_rsv = &block_rsv; | |
423 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 424 | |
8696c533 | 425 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
426 | if (ret) |
427 | goto fail; | |
428 | ||
5d4f98a2 | 429 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
5581a51a | 430 | 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
431 | if (IS_ERR(leaf)) { |
432 | ret = PTR_ERR(leaf); | |
433 | goto fail; | |
434 | } | |
f46b5a66 | 435 | |
5d4f98a2 | 436 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
437 | btrfs_set_header_bytenr(leaf, leaf->start); |
438 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 439 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
440 | btrfs_set_header_owner(leaf, objectid); |
441 | ||
0a4e5586 | 442 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
f46b5a66 | 443 | BTRFS_FSID_SIZE); |
5d4f98a2 | 444 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
b308bc2f | 445 | btrfs_header_chunk_tree_uuid(leaf), |
5d4f98a2 | 446 | BTRFS_UUID_SIZE); |
f46b5a66 CH |
447 | btrfs_mark_buffer_dirty(leaf); |
448 | ||
8ea05e3a AB |
449 | memset(&root_item, 0, sizeof(root_item)); |
450 | ||
f46b5a66 | 451 | inode_item = &root_item.inode; |
3cae210f QW |
452 | btrfs_set_stack_inode_generation(inode_item, 1); |
453 | btrfs_set_stack_inode_size(inode_item, 3); | |
454 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
455 | btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); | |
456 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); | |
f46b5a66 | 457 | |
3cae210f QW |
458 | btrfs_set_root_flags(&root_item, 0); |
459 | btrfs_set_root_limit(&root_item, 0); | |
460 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); | |
08fe4db1 | 461 | |
f46b5a66 | 462 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 463 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
464 | btrfs_set_root_level(&root_item, 0); |
465 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 466 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 467 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 468 | |
8ea05e3a AB |
469 | btrfs_set_root_generation_v2(&root_item, |
470 | btrfs_root_generation(&root_item)); | |
471 | uuid_le_gen(&new_uuid); | |
472 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
3cae210f QW |
473 | btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); |
474 | btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); | |
8ea05e3a AB |
475 | root_item.ctime = root_item.otime; |
476 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
477 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 478 | |
925baedd | 479 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
480 | free_extent_buffer(leaf); |
481 | leaf = NULL; | |
482 | ||
483 | btrfs_set_root_dirid(&root_item, new_dirid); | |
484 | ||
485 | key.objectid = objectid; | |
5d4f98a2 | 486 | key.offset = 0; |
f46b5a66 CH |
487 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
488 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
489 | &root_item); | |
490 | if (ret) | |
491 | goto fail; | |
492 | ||
76dda93c YZ |
493 | key.offset = (u64)-1; |
494 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
495 | if (IS_ERR(new_root)) { |
496 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); | |
497 | ret = PTR_ERR(new_root); | |
498 | goto fail; | |
499 | } | |
76dda93c YZ |
500 | |
501 | btrfs_record_root_in_trans(trans, new_root); | |
502 | ||
d82a6f1d | 503 | ret = btrfs_create_subvol_root(trans, new_root, new_dirid); |
ce598979 MF |
504 | if (ret) { |
505 | /* We potentially lose an unused inode item here */ | |
79787eaa | 506 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
507 | goto fail; |
508 | } | |
509 | ||
f46b5a66 CH |
510 | /* |
511 | * insert the directory item | |
512 | */ | |
3de4586c | 513 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
514 | if (ret) { |
515 | btrfs_abort_transaction(trans, root, ret); | |
516 | goto fail; | |
517 | } | |
3de4586c CM |
518 | |
519 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 520 | name, namelen, dir, &key, |
3de4586c | 521 | BTRFS_FT_DIR, index); |
79787eaa JM |
522 | if (ret) { |
523 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 524 | goto fail; |
79787eaa | 525 | } |
0660b5af | 526 | |
52c26179 YZ |
527 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
528 | ret = btrfs_update_inode(trans, root, dir); | |
529 | BUG_ON(ret); | |
530 | ||
0660b5af | 531 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 532 | objectid, root->root_key.objectid, |
33345d01 | 533 | btrfs_ino(dir), index, name, namelen); |
76dda93c | 534 | BUG_ON(ret); |
f46b5a66 | 535 | |
dd5f9615 SB |
536 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
537 | root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
538 | objectid); | |
539 | if (ret) | |
540 | btrfs_abort_transaction(trans, root, ret); | |
541 | ||
f46b5a66 | 542 | fail: |
d5c12070 MX |
543 | trans->block_rsv = NULL; |
544 | trans->bytes_reserved = 0; | |
72fd032e SW |
545 | if (async_transid) { |
546 | *async_transid = trans->transid; | |
547 | err = btrfs_commit_transaction_async(trans, root, 1); | |
00d71c9c MX |
548 | if (err) |
549 | err = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
550 | } else { |
551 | err = btrfs_commit_transaction(trans, root); | |
552 | } | |
f46b5a66 CH |
553 | if (err && !ret) |
554 | ret = err; | |
1a65e24b CM |
555 | |
556 | if (!ret) | |
557 | d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); | |
d5c12070 MX |
558 | out: |
559 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
f46b5a66 CH |
560 | return ret; |
561 | } | |
562 | ||
e9662f70 MX |
563 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
564 | struct dentry *dentry, char *name, int namelen, | |
565 | u64 *async_transid, bool readonly, | |
566 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 567 | { |
2e4bfab9 | 568 | struct inode *inode; |
f46b5a66 CH |
569 | struct btrfs_pending_snapshot *pending_snapshot; |
570 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 571 | int ret; |
f46b5a66 CH |
572 | |
573 | if (!root->ref_cows) | |
574 | return -EINVAL; | |
575 | ||
6a03843d MX |
576 | ret = btrfs_start_delalloc_inodes(root, 0); |
577 | if (ret) | |
578 | return ret; | |
579 | ||
b0244199 | 580 | btrfs_wait_ordered_extents(root, -1); |
6a03843d | 581 | |
3de4586c | 582 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
583 | if (!pending_snapshot) |
584 | return -ENOMEM; | |
585 | ||
66d8f3dd MX |
586 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
587 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
588 | /* |
589 | * 1 - parent dir inode | |
590 | * 2 - dir entries | |
591 | * 1 - root item | |
592 | * 2 - root ref/backref | |
593 | * 1 - root of snapshot | |
dd5f9615 | 594 | * 1 - UUID item |
d5c12070 MX |
595 | */ |
596 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 597 | &pending_snapshot->block_rsv, 8, |
ee3441b4 JM |
598 | &pending_snapshot->qgroup_reserved, |
599 | false); | |
d5c12070 MX |
600 | if (ret) |
601 | goto out; | |
602 | ||
3de4586c | 603 | pending_snapshot->dentry = dentry; |
f46b5a66 | 604 | pending_snapshot->root = root; |
b83cc969 | 605 | pending_snapshot->readonly = readonly; |
e9662f70 | 606 | pending_snapshot->dir = dir; |
8696c533 | 607 | pending_snapshot->inherit = inherit; |
a22285a6 | 608 | |
d5c12070 | 609 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
610 | if (IS_ERR(trans)) { |
611 | ret = PTR_ERR(trans); | |
612 | goto fail; | |
613 | } | |
614 | ||
8351583e | 615 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
616 | list_add(&pending_snapshot->list, |
617 | &trans->transaction->pending_snapshots); | |
8351583e | 618 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
619 | if (async_transid) { |
620 | *async_transid = trans->transid; | |
621 | ret = btrfs_commit_transaction_async(trans, | |
622 | root->fs_info->extent_root, 1); | |
00d71c9c MX |
623 | if (ret) |
624 | ret = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
625 | } else { |
626 | ret = btrfs_commit_transaction(trans, | |
627 | root->fs_info->extent_root); | |
628 | } | |
aec8030a | 629 | if (ret) |
c37b2b62 | 630 | goto fail; |
a22285a6 YZ |
631 | |
632 | ret = pending_snapshot->error; | |
633 | if (ret) | |
634 | goto fail; | |
635 | ||
66b4ffd1 JB |
636 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
637 | if (ret) | |
638 | goto fail; | |
f46b5a66 | 639 | |
2fbe8c8a | 640 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
641 | if (IS_ERR(inode)) { |
642 | ret = PTR_ERR(inode); | |
643 | goto fail; | |
644 | } | |
645 | BUG_ON(!inode); | |
646 | d_instantiate(dentry, inode); | |
647 | ret = 0; | |
648 | fail: | |
d5c12070 MX |
649 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
650 | &pending_snapshot->block_rsv, | |
651 | pending_snapshot->qgroup_reserved); | |
652 | out: | |
a22285a6 | 653 | kfree(pending_snapshot); |
f46b5a66 CH |
654 | return ret; |
655 | } | |
656 | ||
4260f7c7 SW |
657 | /* copy of check_sticky in fs/namei.c() |
658 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
659 | * minimal. | |
660 | */ | |
661 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
662 | { | |
2f2f43d3 | 663 | kuid_t fsuid = current_fsuid(); |
4260f7c7 SW |
664 | |
665 | if (!(dir->i_mode & S_ISVTX)) | |
666 | return 0; | |
2f2f43d3 | 667 | if (uid_eq(inode->i_uid, fsuid)) |
4260f7c7 | 668 | return 0; |
2f2f43d3 | 669 | if (uid_eq(dir->i_uid, fsuid)) |
4260f7c7 SW |
670 | return 0; |
671 | return !capable(CAP_FOWNER); | |
672 | } | |
673 | ||
674 | /* copy of may_delete in fs/namei.c() | |
675 | * Check whether we can remove a link victim from directory dir, check | |
676 | * whether the type of victim is right. | |
677 | * 1. We can't do it if dir is read-only (done in permission()) | |
678 | * 2. We should have write and exec permissions on dir | |
679 | * 3. We can't remove anything from append-only dir | |
680 | * 4. We can't do anything with immutable dir (done in permission()) | |
681 | * 5. If the sticky bit on dir is set we should either | |
682 | * a. be owner of dir, or | |
683 | * b. be owner of victim, or | |
684 | * c. have CAP_FOWNER capability | |
685 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
686 | * links pointing to it. | |
687 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
688 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
689 | * 9. We can't remove a root or mountpoint. | |
690 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
691 | * nfs_async_unlink(). | |
692 | */ | |
693 | ||
67871254 | 694 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
695 | { |
696 | int error; | |
697 | ||
698 | if (!victim->d_inode) | |
699 | return -ENOENT; | |
700 | ||
701 | BUG_ON(victim->d_parent->d_inode != dir); | |
4fa6b5ec | 702 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
703 | |
704 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
705 | if (error) | |
706 | return error; | |
707 | if (IS_APPEND(dir)) | |
708 | return -EPERM; | |
709 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
710 | IS_APPEND(victim->d_inode)|| | |
711 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
712 | return -EPERM; | |
713 | if (isdir) { | |
714 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
715 | return -ENOTDIR; | |
716 | if (IS_ROOT(victim)) | |
717 | return -EBUSY; | |
718 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
719 | return -EISDIR; | |
720 | if (IS_DEADDIR(dir)) | |
721 | return -ENOENT; | |
722 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
723 | return -EBUSY; | |
724 | return 0; | |
725 | } | |
726 | ||
cb8e7090 CH |
727 | /* copy of may_create in fs/namei.c() */ |
728 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
729 | { | |
730 | if (child->d_inode) | |
731 | return -EEXIST; | |
732 | if (IS_DEADDIR(dir)) | |
733 | return -ENOENT; | |
734 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
735 | } | |
736 | ||
737 | /* | |
738 | * Create a new subvolume below @parent. This is largely modeled after | |
739 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
740 | * inside this filesystem so it's quite a bit simpler. | |
741 | */ | |
76dda93c YZ |
742 | static noinline int btrfs_mksubvol(struct path *parent, |
743 | char *name, int namelen, | |
72fd032e | 744 | struct btrfs_root *snap_src, |
6f72c7e2 | 745 | u64 *async_transid, bool readonly, |
8696c533 | 746 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 747 | { |
76dda93c | 748 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
749 | struct dentry *dentry; |
750 | int error; | |
751 | ||
5c50c9b8 DS |
752 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
753 | if (error == -EINTR) | |
754 | return error; | |
cb8e7090 CH |
755 | |
756 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
757 | error = PTR_ERR(dentry); | |
758 | if (IS_ERR(dentry)) | |
759 | goto out_unlock; | |
760 | ||
761 | error = -EEXIST; | |
762 | if (dentry->d_inode) | |
763 | goto out_dput; | |
764 | ||
76dda93c | 765 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 766 | if (error) |
a874a63e | 767 | goto out_dput; |
cb8e7090 | 768 | |
9c52057c CM |
769 | /* |
770 | * even if this name doesn't exist, we may get hash collisions. | |
771 | * check for them now when we can safely fail | |
772 | */ | |
773 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
774 | dir->i_ino, name, | |
775 | namelen); | |
776 | if (error) | |
777 | goto out_dput; | |
778 | ||
76dda93c YZ |
779 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
780 | ||
781 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
782 | goto out_up_read; | |
783 | ||
3de4586c | 784 | if (snap_src) { |
e9662f70 | 785 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
6f72c7e2 | 786 | async_transid, readonly, inherit); |
3de4586c | 787 | } else { |
d5c12070 MX |
788 | error = create_subvol(dir, dentry, name, namelen, |
789 | async_transid, inherit); | |
3de4586c | 790 | } |
76dda93c YZ |
791 | if (!error) |
792 | fsnotify_mkdir(dir, dentry); | |
793 | out_up_read: | |
794 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
795 | out_dput: |
796 | dput(dentry); | |
797 | out_unlock: | |
76dda93c | 798 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
799 | return error; |
800 | } | |
801 | ||
4cb5300b CM |
802 | /* |
803 | * When we're defragging a range, we don't want to kick it off again | |
804 | * if it is really just waiting for delalloc to send it down. | |
805 | * If we find a nice big extent or delalloc range for the bytes in the | |
806 | * file you want to defrag, we return 0 to let you know to skip this | |
807 | * part of the file | |
808 | */ | |
809 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) | |
810 | { | |
811 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
812 | struct extent_map *em = NULL; | |
813 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
814 | u64 end; | |
815 | ||
816 | read_lock(&em_tree->lock); | |
817 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
818 | read_unlock(&em_tree->lock); | |
819 | ||
820 | if (em) { | |
821 | end = extent_map_end(em); | |
822 | free_extent_map(em); | |
823 | if (end - offset > thresh) | |
824 | return 0; | |
825 | } | |
826 | /* if we already have a nice delalloc here, just stop */ | |
827 | thresh /= 2; | |
828 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
829 | thresh, EXTENT_DELALLOC, 1); | |
830 | if (end >= thresh) | |
831 | return 0; | |
832 | return 1; | |
833 | } | |
834 | ||
835 | /* | |
836 | * helper function to walk through a file and find extents | |
837 | * newer than a specific transid, and smaller than thresh. | |
838 | * | |
839 | * This is used by the defragging code to find new and small | |
840 | * extents | |
841 | */ | |
842 | static int find_new_extents(struct btrfs_root *root, | |
843 | struct inode *inode, u64 newer_than, | |
844 | u64 *off, int thresh) | |
845 | { | |
846 | struct btrfs_path *path; | |
847 | struct btrfs_key min_key; | |
4cb5300b CM |
848 | struct extent_buffer *leaf; |
849 | struct btrfs_file_extent_item *extent; | |
850 | int type; | |
851 | int ret; | |
a4689d2b | 852 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
853 | |
854 | path = btrfs_alloc_path(); | |
855 | if (!path) | |
856 | return -ENOMEM; | |
857 | ||
a4689d2b | 858 | min_key.objectid = ino; |
4cb5300b CM |
859 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
860 | min_key.offset = *off; | |
861 | ||
4cb5300b CM |
862 | path->keep_locks = 1; |
863 | ||
67871254 | 864 | while (1) { |
6174d3cb | 865 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
4cb5300b CM |
866 | if (ret != 0) |
867 | goto none; | |
a4689d2b | 868 | if (min_key.objectid != ino) |
4cb5300b CM |
869 | goto none; |
870 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
871 | goto none; | |
872 | ||
873 | leaf = path->nodes[0]; | |
874 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
875 | struct btrfs_file_extent_item); | |
876 | ||
877 | type = btrfs_file_extent_type(leaf, extent); | |
878 | if (type == BTRFS_FILE_EXTENT_REG && | |
879 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
880 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
881 | *off = min_key.offset; | |
882 | btrfs_free_path(path); | |
883 | return 0; | |
884 | } | |
885 | ||
886 | if (min_key.offset == (u64)-1) | |
887 | goto none; | |
888 | ||
889 | min_key.offset++; | |
890 | btrfs_release_path(path); | |
891 | } | |
892 | none: | |
893 | btrfs_free_path(path); | |
894 | return -ENOENT; | |
895 | } | |
896 | ||
6c282eb4 | 897 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
898 | { |
899 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
900 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
901 | struct extent_map *em; | |
902 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 903 | |
6c282eb4 LZ |
904 | /* |
905 | * hopefully we have this extent in the tree already, try without | |
906 | * the full extent lock | |
907 | */ | |
17ce6ef8 | 908 | read_lock(&em_tree->lock); |
6c282eb4 | 909 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
910 | read_unlock(&em_tree->lock); |
911 | ||
6c282eb4 LZ |
912 | if (!em) { |
913 | /* get the big lock and read metadata off disk */ | |
914 | lock_extent(io_tree, start, start + len - 1); | |
915 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
916 | unlock_extent(io_tree, start, start + len - 1); | |
917 | ||
918 | if (IS_ERR(em)) | |
919 | return NULL; | |
920 | } | |
921 | ||
922 | return em; | |
923 | } | |
17ce6ef8 | 924 | |
6c282eb4 LZ |
925 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
926 | { | |
927 | struct extent_map *next; | |
928 | bool ret = true; | |
929 | ||
930 | /* this is the last extent */ | |
931 | if (em->start + em->len >= i_size_read(inode)) | |
932 | return false; | |
933 | ||
934 | next = defrag_lookup_extent(inode, em->start + em->len); | |
935 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) | |
936 | ret = false; | |
937 | ||
938 | free_extent_map(next); | |
17ce6ef8 LB |
939 | return ret; |
940 | } | |
941 | ||
6c282eb4 | 942 | static int should_defrag_range(struct inode *inode, u64 start, int thresh, |
a43a2111 AM |
943 | u64 *last_len, u64 *skip, u64 *defrag_end, |
944 | int compress) | |
940100a4 | 945 | { |
6c282eb4 | 946 | struct extent_map *em; |
940100a4 | 947 | int ret = 1; |
6c282eb4 | 948 | bool next_mergeable = true; |
940100a4 CM |
949 | |
950 | /* | |
008873ea | 951 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
952 | * defragging it |
953 | */ | |
954 | if (start < *defrag_end) | |
955 | return 1; | |
956 | ||
957 | *skip = 0; | |
958 | ||
6c282eb4 LZ |
959 | em = defrag_lookup_extent(inode, start); |
960 | if (!em) | |
961 | return 0; | |
940100a4 CM |
962 | |
963 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 964 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 965 | ret = 0; |
17ce6ef8 LB |
966 | goto out; |
967 | } | |
968 | ||
6c282eb4 | 969 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 CM |
970 | |
971 | /* | |
6c282eb4 LZ |
972 | * we hit a real extent, if it is big or the next extent is not a |
973 | * real extent, don't bother defragging it | |
940100a4 | 974 | */ |
a43a2111 | 975 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
6c282eb4 | 976 | (em->len >= thresh || !next_mergeable)) |
940100a4 | 977 | ret = 0; |
17ce6ef8 | 978 | out: |
940100a4 CM |
979 | /* |
980 | * last_len ends up being a counter of how many bytes we've defragged. | |
981 | * every time we choose not to defrag an extent, we reset *last_len | |
982 | * so that the next tiny extent will force a defrag. | |
983 | * | |
984 | * The end result of this is that tiny extents before a single big | |
985 | * extent will force at least part of that big extent to be defragged. | |
986 | */ | |
987 | if (ret) { | |
940100a4 CM |
988 | *defrag_end = extent_map_end(em); |
989 | } else { | |
990 | *last_len = 0; | |
991 | *skip = extent_map_end(em); | |
992 | *defrag_end = 0; | |
993 | } | |
994 | ||
995 | free_extent_map(em); | |
996 | return ret; | |
997 | } | |
998 | ||
4cb5300b CM |
999 | /* |
1000 | * it doesn't do much good to defrag one or two pages | |
1001 | * at a time. This pulls in a nice chunk of pages | |
1002 | * to COW and defrag. | |
1003 | * | |
1004 | * It also makes sure the delalloc code has enough | |
1005 | * dirty data to avoid making new small extents as part | |
1006 | * of the defrag | |
1007 | * | |
1008 | * It's a good idea to start RA on this range | |
1009 | * before calling this. | |
1010 | */ | |
1011 | static int cluster_pages_for_defrag(struct inode *inode, | |
1012 | struct page **pages, | |
1013 | unsigned long start_index, | |
1014 | int num_pages) | |
f46b5a66 | 1015 | { |
4cb5300b CM |
1016 | unsigned long file_end; |
1017 | u64 isize = i_size_read(inode); | |
1018 | u64 page_start; | |
1019 | u64 page_end; | |
1f12bd06 | 1020 | u64 page_cnt; |
4cb5300b CM |
1021 | int ret; |
1022 | int i; | |
1023 | int i_done; | |
3eaa2885 | 1024 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1025 | struct extent_state *cached_state = NULL; |
600a45e1 | 1026 | struct extent_io_tree *tree; |
3b16a4e3 | 1027 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1028 | |
4cb5300b | 1029 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
1030 | if (!isize || start_index > file_end) |
1031 | return 0; | |
1032 | ||
1033 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
1034 | |
1035 | ret = btrfs_delalloc_reserve_space(inode, | |
1f12bd06 | 1036 | page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1037 | if (ret) |
1038 | return ret; | |
4cb5300b | 1039 | i_done = 0; |
600a45e1 | 1040 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1041 | |
1042 | /* step one, lock all the pages */ | |
1f12bd06 | 1043 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1044 | struct page *page; |
600a45e1 | 1045 | again: |
a94733d0 | 1046 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1047 | start_index + i, mask); |
4cb5300b CM |
1048 | if (!page) |
1049 | break; | |
1050 | ||
600a45e1 MX |
1051 | page_start = page_offset(page); |
1052 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1053 | while (1) { | |
d0082371 | 1054 | lock_extent(tree, page_start, page_end); |
600a45e1 MX |
1055 | ordered = btrfs_lookup_ordered_extent(inode, |
1056 | page_start); | |
d0082371 | 1057 | unlock_extent(tree, page_start, page_end); |
600a45e1 MX |
1058 | if (!ordered) |
1059 | break; | |
1060 | ||
1061 | unlock_page(page); | |
1062 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1063 | btrfs_put_ordered_extent(ordered); | |
1064 | lock_page(page); | |
1f12bd06 LB |
1065 | /* |
1066 | * we unlocked the page above, so we need check if | |
1067 | * it was released or not. | |
1068 | */ | |
1069 | if (page->mapping != inode->i_mapping) { | |
1070 | unlock_page(page); | |
1071 | page_cache_release(page); | |
1072 | goto again; | |
1073 | } | |
600a45e1 MX |
1074 | } |
1075 | ||
4cb5300b CM |
1076 | if (!PageUptodate(page)) { |
1077 | btrfs_readpage(NULL, page); | |
1078 | lock_page(page); | |
1079 | if (!PageUptodate(page)) { | |
1080 | unlock_page(page); | |
1081 | page_cache_release(page); | |
1082 | ret = -EIO; | |
1083 | break; | |
1084 | } | |
1085 | } | |
600a45e1 | 1086 | |
600a45e1 MX |
1087 | if (page->mapping != inode->i_mapping) { |
1088 | unlock_page(page); | |
1089 | page_cache_release(page); | |
1090 | goto again; | |
1091 | } | |
1092 | ||
4cb5300b CM |
1093 | pages[i] = page; |
1094 | i_done++; | |
1095 | } | |
1096 | if (!i_done || ret) | |
1097 | goto out; | |
1098 | ||
1099 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1100 | goto out; | |
1101 | ||
1102 | /* | |
1103 | * so now we have a nice long stream of locked | |
1104 | * and up to date pages, lets wait on them | |
1105 | */ | |
1106 | for (i = 0; i < i_done; i++) | |
1107 | wait_on_page_writeback(pages[i]); | |
1108 | ||
1109 | page_start = page_offset(pages[0]); | |
1110 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1111 | ||
1112 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1113 | page_start, page_end - 1, 0, &cached_state); |
4cb5300b CM |
1114 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1115 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1116 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1117 | &cached_state, GFP_NOFS); | |
4cb5300b | 1118 | |
1f12bd06 | 1119 | if (i_done != page_cnt) { |
9e0baf60 JB |
1120 | spin_lock(&BTRFS_I(inode)->lock); |
1121 | BTRFS_I(inode)->outstanding_extents++; | |
1122 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1123 | btrfs_delalloc_release_space(inode, |
1f12bd06 | 1124 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1125 | } |
1126 | ||
1127 | ||
9e8a4a8b LB |
1128 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1129 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1130 | |
1131 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1132 | page_start, page_end - 1, &cached_state, | |
1133 | GFP_NOFS); | |
1134 | ||
1135 | for (i = 0; i < i_done; i++) { | |
1136 | clear_page_dirty_for_io(pages[i]); | |
1137 | ClearPageChecked(pages[i]); | |
1138 | set_page_extent_mapped(pages[i]); | |
1139 | set_page_dirty(pages[i]); | |
1140 | unlock_page(pages[i]); | |
1141 | page_cache_release(pages[i]); | |
1142 | } | |
1143 | return i_done; | |
1144 | out: | |
1145 | for (i = 0; i < i_done; i++) { | |
1146 | unlock_page(pages[i]); | |
1147 | page_cache_release(pages[i]); | |
1148 | } | |
1f12bd06 | 1149 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1150 | return ret; |
1151 | ||
1152 | } | |
1153 | ||
1154 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1155 | struct btrfs_ioctl_defrag_range_args *range, | |
1156 | u64 newer_than, unsigned long max_to_defrag) | |
1157 | { | |
1158 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1159 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1160 | unsigned long last_index; |
151a31b2 | 1161 | u64 isize = i_size_read(inode); |
940100a4 CM |
1162 | u64 last_len = 0; |
1163 | u64 skip = 0; | |
1164 | u64 defrag_end = 0; | |
4cb5300b | 1165 | u64 newer_off = range->start; |
f46b5a66 | 1166 | unsigned long i; |
008873ea | 1167 | unsigned long ra_index = 0; |
f46b5a66 | 1168 | int ret; |
4cb5300b | 1169 | int defrag_count = 0; |
1a419d85 | 1170 | int compress_type = BTRFS_COMPRESS_ZLIB; |
4cb5300b | 1171 | int extent_thresh = range->extent_thresh; |
008873ea LZ |
1172 | int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
1173 | int cluster = max_cluster; | |
4cb5300b CM |
1174 | u64 new_align = ~((u64)128 * 1024 - 1); |
1175 | struct page **pages = NULL; | |
1176 | ||
0abd5b17 LB |
1177 | if (isize == 0) |
1178 | return 0; | |
1179 | ||
1180 | if (range->start >= isize) | |
1181 | return -EINVAL; | |
1a419d85 LZ |
1182 | |
1183 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1184 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1185 | return -EINVAL; | |
1186 | if (range->compress_type) | |
1187 | compress_type = range->compress_type; | |
1188 | } | |
f46b5a66 | 1189 | |
0abd5b17 LB |
1190 | if (extent_thresh == 0) |
1191 | extent_thresh = 256 * 1024; | |
940100a4 | 1192 | |
4cb5300b CM |
1193 | /* |
1194 | * if we were not given a file, allocate a readahead | |
1195 | * context | |
1196 | */ | |
1197 | if (!file) { | |
1198 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1199 | if (!ra) | |
1200 | return -ENOMEM; | |
1201 | file_ra_state_init(ra, inode->i_mapping); | |
1202 | } else { | |
1203 | ra = &file->f_ra; | |
1204 | } | |
1205 | ||
d9b0d9ba | 1206 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
4cb5300b CM |
1207 | GFP_NOFS); |
1208 | if (!pages) { | |
1209 | ret = -ENOMEM; | |
1210 | goto out_ra; | |
1211 | } | |
1212 | ||
1213 | /* find the last page to defrag */ | |
1e701a32 | 1214 | if (range->start + range->len > range->start) { |
151a31b2 | 1215 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1216 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1217 | } else { | |
151a31b2 | 1218 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1219 | } |
1220 | ||
4cb5300b CM |
1221 | if (newer_than) { |
1222 | ret = find_new_extents(root, inode, newer_than, | |
1223 | &newer_off, 64 * 1024); | |
1224 | if (!ret) { | |
1225 | range->start = newer_off; | |
1226 | /* | |
1227 | * we always align our defrag to help keep | |
1228 | * the extents in the file evenly spaced | |
1229 | */ | |
1230 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1231 | } else |
1232 | goto out_ra; | |
1233 | } else { | |
1234 | i = range->start >> PAGE_CACHE_SHIFT; | |
1235 | } | |
1236 | if (!max_to_defrag) | |
7ec31b54 | 1237 | max_to_defrag = last_index + 1; |
4cb5300b | 1238 | |
2a0f7f57 LZ |
1239 | /* |
1240 | * make writeback starts from i, so the defrag range can be | |
1241 | * written sequentially. | |
1242 | */ | |
1243 | if (i < inode->i_mapping->writeback_index) | |
1244 | inode->i_mapping->writeback_index = i; | |
1245 | ||
f7f43cc8 CM |
1246 | while (i <= last_index && defrag_count < max_to_defrag && |
1247 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1248 | PAGE_CACHE_SHIFT)) { | |
4cb5300b CM |
1249 | /* |
1250 | * make sure we stop running if someone unmounts | |
1251 | * the FS | |
1252 | */ | |
1253 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1254 | break; | |
1255 | ||
210549eb DS |
1256 | if (btrfs_defrag_cancelled(root->fs_info)) { |
1257 | printk(KERN_DEBUG "btrfs: defrag_file cancelled\n"); | |
1258 | ret = -EAGAIN; | |
1259 | break; | |
1260 | } | |
1261 | ||
66c26892 | 1262 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1263 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1264 | &defrag_end, range->flags & |
1265 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1266 | unsigned long next; |
1267 | /* | |
1268 | * the should_defrag function tells us how much to skip | |
1269 | * bump our counter by the suggested amount | |
1270 | */ | |
1271 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
1272 | i = max(i + 1, next); | |
1273 | continue; | |
1274 | } | |
008873ea LZ |
1275 | |
1276 | if (!newer_than) { | |
1277 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1278 | PAGE_CACHE_SHIFT) - i; | |
1279 | cluster = min(cluster, max_cluster); | |
1280 | } else { | |
1281 | cluster = max_cluster; | |
1282 | } | |
1283 | ||
008873ea LZ |
1284 | if (i + cluster > ra_index) { |
1285 | ra_index = max(i, ra_index); | |
1286 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1287 | cluster); | |
1288 | ra_index += max_cluster; | |
1289 | } | |
940100a4 | 1290 | |
ecb8bea8 | 1291 | mutex_lock(&inode->i_mutex); |
633085c7 FDBM |
1292 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1293 | BTRFS_I(inode)->force_compress = compress_type; | |
008873ea | 1294 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 LB |
1295 | if (ret < 0) { |
1296 | mutex_unlock(&inode->i_mutex); | |
4cb5300b | 1297 | goto out_ra; |
ecb8bea8 | 1298 | } |
4cb5300b CM |
1299 | |
1300 | defrag_count += ret; | |
d0e1d66b | 1301 | balance_dirty_pages_ratelimited(inode->i_mapping); |
ecb8bea8 | 1302 | mutex_unlock(&inode->i_mutex); |
4cb5300b CM |
1303 | |
1304 | if (newer_than) { | |
1305 | if (newer_off == (u64)-1) | |
1306 | break; | |
1307 | ||
e1f041e1 LB |
1308 | if (ret > 0) |
1309 | i += ret; | |
1310 | ||
4cb5300b CM |
1311 | newer_off = max(newer_off + 1, |
1312 | (u64)i << PAGE_CACHE_SHIFT); | |
1313 | ||
1314 | ret = find_new_extents(root, inode, | |
1315 | newer_than, &newer_off, | |
1316 | 64 * 1024); | |
1317 | if (!ret) { | |
1318 | range->start = newer_off; | |
1319 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1320 | } else { |
1321 | break; | |
f46b5a66 | 1322 | } |
4cb5300b | 1323 | } else { |
008873ea | 1324 | if (ret > 0) { |
cbcc8326 | 1325 | i += ret; |
008873ea LZ |
1326 | last_len += ret << PAGE_CACHE_SHIFT; |
1327 | } else { | |
cbcc8326 | 1328 | i++; |
008873ea LZ |
1329 | last_len = 0; |
1330 | } | |
f46b5a66 | 1331 | } |
f46b5a66 CH |
1332 | } |
1333 | ||
1e701a32 CM |
1334 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
1335 | filemap_flush(inode->i_mapping); | |
1336 | ||
1337 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1338 | /* the filemap_flush will queue IO into the worker threads, but | |
1339 | * we have to make sure the IO is actually started and that | |
1340 | * ordered extents get created before we return | |
1341 | */ | |
1342 | atomic_inc(&root->fs_info->async_submit_draining); | |
1343 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1344 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1345 | wait_event(root->fs_info->async_submit_wait, | |
1346 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1347 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1348 | } | |
1349 | atomic_dec(&root->fs_info->async_submit_draining); | |
1e701a32 CM |
1350 | } |
1351 | ||
1a419d85 | 1352 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1353 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1354 | } |
1355 | ||
60ccf82f | 1356 | ret = defrag_count; |
940100a4 | 1357 | |
4cb5300b | 1358 | out_ra: |
633085c7 FDBM |
1359 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
1360 | mutex_lock(&inode->i_mutex); | |
1361 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; | |
1362 | mutex_unlock(&inode->i_mutex); | |
1363 | } | |
4cb5300b CM |
1364 | if (!file) |
1365 | kfree(ra); | |
1366 | kfree(pages); | |
940100a4 | 1367 | return ret; |
f46b5a66 CH |
1368 | } |
1369 | ||
198605a8 | 1370 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1371 | void __user *arg) |
f46b5a66 CH |
1372 | { |
1373 | u64 new_size; | |
1374 | u64 old_size; | |
1375 | u64 devid = 1; | |
496ad9aa | 1376 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
1377 | struct btrfs_ioctl_vol_args *vol_args; |
1378 | struct btrfs_trans_handle *trans; | |
1379 | struct btrfs_device *device = NULL; | |
1380 | char *sizestr; | |
1381 | char *devstr = NULL; | |
1382 | int ret = 0; | |
f46b5a66 CH |
1383 | int mod = 0; |
1384 | ||
e441d54d CM |
1385 | if (!capable(CAP_SYS_ADMIN)) |
1386 | return -EPERM; | |
1387 | ||
198605a8 MX |
1388 | ret = mnt_want_write_file(file); |
1389 | if (ret) | |
1390 | return ret; | |
1391 | ||
5ac00add SB |
1392 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1393 | 1)) { | |
97547676 | 1394 | mnt_drop_write_file(file); |
e57138b3 | 1395 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
1396 | } |
1397 | ||
5ac00add | 1398 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1399 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1400 | if (IS_ERR(vol_args)) { |
1401 | ret = PTR_ERR(vol_args); | |
1402 | goto out; | |
1403 | } | |
5516e595 MF |
1404 | |
1405 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1406 | |
f46b5a66 CH |
1407 | sizestr = vol_args->name; |
1408 | devstr = strchr(sizestr, ':'); | |
1409 | if (devstr) { | |
1410 | char *end; | |
1411 | sizestr = devstr + 1; | |
1412 | *devstr = '\0'; | |
1413 | devstr = vol_args->name; | |
1414 | devid = simple_strtoull(devstr, &end, 10); | |
dfd79829 MX |
1415 | if (!devid) { |
1416 | ret = -EINVAL; | |
1417 | goto out_free; | |
1418 | } | |
c1c9ff7c | 1419 | printk(KERN_INFO "btrfs: resizing devid %llu\n", devid); |
f46b5a66 | 1420 | } |
dba60f3f | 1421 | |
aa1b8cd4 | 1422 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1423 | if (!device) { |
5bb14682 | 1424 | printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", |
c1c9ff7c | 1425 | devid); |
dfd79829 | 1426 | ret = -ENODEV; |
c9e9f97b | 1427 | goto out_free; |
f46b5a66 | 1428 | } |
dba60f3f MX |
1429 | |
1430 | if (!device->writeable) { | |
4e42ae1b | 1431 | printk(KERN_INFO "btrfs: resizer unable to apply on " |
dba60f3f | 1432 | "readonly device %llu\n", |
c1c9ff7c | 1433 | devid); |
dfd79829 | 1434 | ret = -EPERM; |
4e42ae1b LB |
1435 | goto out_free; |
1436 | } | |
1437 | ||
f46b5a66 CH |
1438 | if (!strcmp(sizestr, "max")) |
1439 | new_size = device->bdev->bd_inode->i_size; | |
1440 | else { | |
1441 | if (sizestr[0] == '-') { | |
1442 | mod = -1; | |
1443 | sizestr++; | |
1444 | } else if (sizestr[0] == '+') { | |
1445 | mod = 1; | |
1446 | sizestr++; | |
1447 | } | |
91748467 | 1448 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
1449 | if (new_size == 0) { |
1450 | ret = -EINVAL; | |
c9e9f97b | 1451 | goto out_free; |
f46b5a66 CH |
1452 | } |
1453 | } | |
1454 | ||
63a212ab | 1455 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1456 | ret = -EPERM; |
63a212ab SB |
1457 | goto out_free; |
1458 | } | |
1459 | ||
f46b5a66 CH |
1460 | old_size = device->total_bytes; |
1461 | ||
1462 | if (mod < 0) { | |
1463 | if (new_size > old_size) { | |
1464 | ret = -EINVAL; | |
c9e9f97b | 1465 | goto out_free; |
f46b5a66 CH |
1466 | } |
1467 | new_size = old_size - new_size; | |
1468 | } else if (mod > 0) { | |
1469 | new_size = old_size + new_size; | |
1470 | } | |
1471 | ||
1472 | if (new_size < 256 * 1024 * 1024) { | |
1473 | ret = -EINVAL; | |
c9e9f97b | 1474 | goto out_free; |
f46b5a66 CH |
1475 | } |
1476 | if (new_size > device->bdev->bd_inode->i_size) { | |
1477 | ret = -EFBIG; | |
c9e9f97b | 1478 | goto out_free; |
f46b5a66 CH |
1479 | } |
1480 | ||
1481 | do_div(new_size, root->sectorsize); | |
1482 | new_size *= root->sectorsize; | |
1483 | ||
606686ee | 1484 | printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n", |
c1c9ff7c | 1485 | rcu_str_deref(device->name), new_size); |
f46b5a66 CH |
1486 | |
1487 | if (new_size > old_size) { | |
a22285a6 | 1488 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1489 | if (IS_ERR(trans)) { |
1490 | ret = PTR_ERR(trans); | |
c9e9f97b | 1491 | goto out_free; |
98d5dc13 | 1492 | } |
f46b5a66 CH |
1493 | ret = btrfs_grow_device(trans, device, new_size); |
1494 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1495 | } else if (new_size < old_size) { |
f46b5a66 | 1496 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1497 | } /* equal, nothing need to do */ |
f46b5a66 | 1498 | |
c9e9f97b | 1499 | out_free: |
f46b5a66 | 1500 | kfree(vol_args); |
c9e9f97b ID |
1501 | out: |
1502 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1503 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
18f39c41 | 1504 | mnt_drop_write_file(file); |
f46b5a66 CH |
1505 | return ret; |
1506 | } | |
1507 | ||
72fd032e | 1508 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1509 | char *name, unsigned long fd, int subvol, |
1510 | u64 *transid, bool readonly, | |
8696c533 | 1511 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1512 | { |
f46b5a66 | 1513 | int namelen; |
3de4586c | 1514 | int ret = 0; |
f46b5a66 | 1515 | |
a874a63e LB |
1516 | ret = mnt_want_write_file(file); |
1517 | if (ret) | |
1518 | goto out; | |
1519 | ||
72fd032e SW |
1520 | namelen = strlen(name); |
1521 | if (strchr(name, '/')) { | |
f46b5a66 | 1522 | ret = -EINVAL; |
a874a63e | 1523 | goto out_drop_write; |
f46b5a66 CH |
1524 | } |
1525 | ||
16780cab CM |
1526 | if (name[0] == '.' && |
1527 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1528 | ret = -EEXIST; | |
a874a63e | 1529 | goto out_drop_write; |
16780cab CM |
1530 | } |
1531 | ||
3de4586c | 1532 | if (subvol) { |
72fd032e | 1533 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1534 | NULL, transid, readonly, inherit); |
cb8e7090 | 1535 | } else { |
2903ff01 | 1536 | struct fd src = fdget(fd); |
3de4586c | 1537 | struct inode *src_inode; |
2903ff01 | 1538 | if (!src.file) { |
3de4586c | 1539 | ret = -EINVAL; |
a874a63e | 1540 | goto out_drop_write; |
3de4586c CM |
1541 | } |
1542 | ||
496ad9aa AV |
1543 | src_inode = file_inode(src.file); |
1544 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
d397712b CM |
1545 | printk(KERN_INFO "btrfs: Snapshot src from " |
1546 | "another FS\n"); | |
3de4586c | 1547 | ret = -EINVAL; |
ecd18815 AV |
1548 | } else { |
1549 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1550 | BTRFS_I(src_inode)->root, | |
1551 | transid, readonly, inherit); | |
3de4586c | 1552 | } |
2903ff01 | 1553 | fdput(src); |
cb8e7090 | 1554 | } |
a874a63e LB |
1555 | out_drop_write: |
1556 | mnt_drop_write_file(file); | |
f46b5a66 | 1557 | out: |
72fd032e SW |
1558 | return ret; |
1559 | } | |
1560 | ||
1561 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1562 | void __user *arg, int subvol) |
72fd032e | 1563 | { |
fa0d2b9b | 1564 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1565 | int ret; |
1566 | ||
fa0d2b9b LZ |
1567 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1568 | if (IS_ERR(vol_args)) | |
1569 | return PTR_ERR(vol_args); | |
1570 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1571 | |
fa0d2b9b | 1572 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1573 | vol_args->fd, subvol, |
6f72c7e2 | 1574 | NULL, false, NULL); |
fdfb1e4f | 1575 | |
fa0d2b9b LZ |
1576 | kfree(vol_args); |
1577 | return ret; | |
1578 | } | |
fdfb1e4f | 1579 | |
fa0d2b9b LZ |
1580 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1581 | void __user *arg, int subvol) | |
1582 | { | |
1583 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1584 | int ret; | |
1585 | u64 transid = 0; | |
1586 | u64 *ptr = NULL; | |
b83cc969 | 1587 | bool readonly = false; |
6f72c7e2 | 1588 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1589 | |
fa0d2b9b LZ |
1590 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1591 | if (IS_ERR(vol_args)) | |
1592 | return PTR_ERR(vol_args); | |
1593 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1594 | |
b83cc969 | 1595 | if (vol_args->flags & |
6f72c7e2 AJ |
1596 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1597 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1598 | ret = -EOPNOTSUPP; |
fa0d2b9b | 1599 | goto out; |
72fd032e | 1600 | } |
fa0d2b9b LZ |
1601 | |
1602 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1603 | ptr = &transid; | |
b83cc969 LZ |
1604 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1605 | readonly = true; | |
6f72c7e2 AJ |
1606 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1607 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1608 | ret = -EINVAL; | |
1609 | goto out; | |
1610 | } | |
1611 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1612 | if (IS_ERR(inherit)) { | |
1613 | ret = PTR_ERR(inherit); | |
1614 | goto out; | |
1615 | } | |
1616 | } | |
fa0d2b9b LZ |
1617 | |
1618 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1619 | vol_args->fd, subvol, ptr, |
8696c533 | 1620 | readonly, inherit); |
fa0d2b9b LZ |
1621 | |
1622 | if (ret == 0 && ptr && | |
1623 | copy_to_user(arg + | |
1624 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1625 | transid), ptr, sizeof(*ptr))) | |
1626 | ret = -EFAULT; | |
fdfb1e4f | 1627 | out: |
f46b5a66 | 1628 | kfree(vol_args); |
6f72c7e2 | 1629 | kfree(inherit); |
f46b5a66 CH |
1630 | return ret; |
1631 | } | |
1632 | ||
0caa102d LZ |
1633 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1634 | void __user *arg) | |
1635 | { | |
496ad9aa | 1636 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1637 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1638 | int ret = 0; | |
1639 | u64 flags = 0; | |
1640 | ||
33345d01 | 1641 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1642 | return -EINVAL; |
1643 | ||
1644 | down_read(&root->fs_info->subvol_sem); | |
1645 | if (btrfs_root_readonly(root)) | |
1646 | flags |= BTRFS_SUBVOL_RDONLY; | |
1647 | up_read(&root->fs_info->subvol_sem); | |
1648 | ||
1649 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1650 | ret = -EFAULT; | |
1651 | ||
1652 | return ret; | |
1653 | } | |
1654 | ||
1655 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1656 | void __user *arg) | |
1657 | { | |
496ad9aa | 1658 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1659 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1660 | struct btrfs_trans_handle *trans; | |
1661 | u64 root_flags; | |
1662 | u64 flags; | |
1663 | int ret = 0; | |
1664 | ||
b9ca0664 LB |
1665 | ret = mnt_want_write_file(file); |
1666 | if (ret) | |
1667 | goto out; | |
0caa102d | 1668 | |
b9ca0664 LB |
1669 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1670 | ret = -EINVAL; | |
1671 | goto out_drop_write; | |
1672 | } | |
0caa102d | 1673 | |
b9ca0664 LB |
1674 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1675 | ret = -EFAULT; | |
1676 | goto out_drop_write; | |
1677 | } | |
0caa102d | 1678 | |
b9ca0664 LB |
1679 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1680 | ret = -EINVAL; | |
1681 | goto out_drop_write; | |
1682 | } | |
0caa102d | 1683 | |
b9ca0664 LB |
1684 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1685 | ret = -EOPNOTSUPP; | |
1686 | goto out_drop_write; | |
1687 | } | |
0caa102d | 1688 | |
b9ca0664 LB |
1689 | if (!inode_owner_or_capable(inode)) { |
1690 | ret = -EACCES; | |
1691 | goto out_drop_write; | |
1692 | } | |
b4dc2b8c | 1693 | |
0caa102d LZ |
1694 | down_write(&root->fs_info->subvol_sem); |
1695 | ||
1696 | /* nothing to do */ | |
1697 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1698 | goto out_drop_sem; |
0caa102d LZ |
1699 | |
1700 | root_flags = btrfs_root_flags(&root->root_item); | |
1701 | if (flags & BTRFS_SUBVOL_RDONLY) | |
1702 | btrfs_set_root_flags(&root->root_item, | |
1703 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
1704 | else | |
1705 | btrfs_set_root_flags(&root->root_item, | |
1706 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); | |
1707 | ||
1708 | trans = btrfs_start_transaction(root, 1); | |
1709 | if (IS_ERR(trans)) { | |
1710 | ret = PTR_ERR(trans); | |
1711 | goto out_reset; | |
1712 | } | |
1713 | ||
b4dc2b8c | 1714 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1715 | &root->root_key, &root->root_item); |
1716 | ||
1717 | btrfs_commit_transaction(trans, root); | |
1718 | out_reset: | |
1719 | if (ret) | |
1720 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1721 | out_drop_sem: |
0caa102d | 1722 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1723 | out_drop_write: |
1724 | mnt_drop_write_file(file); | |
1725 | out: | |
0caa102d LZ |
1726 | return ret; |
1727 | } | |
1728 | ||
76dda93c YZ |
1729 | /* |
1730 | * helper to check if the subvolume references other subvolumes | |
1731 | */ | |
1732 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1733 | { | |
1734 | struct btrfs_path *path; | |
175a2b87 | 1735 | struct btrfs_dir_item *di; |
76dda93c | 1736 | struct btrfs_key key; |
175a2b87 | 1737 | u64 dir_id; |
76dda93c YZ |
1738 | int ret; |
1739 | ||
1740 | path = btrfs_alloc_path(); | |
1741 | if (!path) | |
1742 | return -ENOMEM; | |
1743 | ||
175a2b87 JB |
1744 | /* Make sure this root isn't set as the default subvol */ |
1745 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); | |
1746 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, | |
1747 | dir_id, "default", 7, 0); | |
1748 | if (di && !IS_ERR(di)) { | |
1749 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1750 | if (key.objectid == root->root_key.objectid) { | |
1751 | ret = -ENOTEMPTY; | |
1752 | goto out; | |
1753 | } | |
1754 | btrfs_release_path(path); | |
1755 | } | |
1756 | ||
76dda93c YZ |
1757 | key.objectid = root->root_key.objectid; |
1758 | key.type = BTRFS_ROOT_REF_KEY; | |
1759 | key.offset = (u64)-1; | |
1760 | ||
1761 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1762 | &key, path, 0, 0); | |
1763 | if (ret < 0) | |
1764 | goto out; | |
1765 | BUG_ON(ret == 0); | |
1766 | ||
1767 | ret = 0; | |
1768 | if (path->slots[0] > 0) { | |
1769 | path->slots[0]--; | |
1770 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1771 | if (key.objectid == root->root_key.objectid && | |
1772 | key.type == BTRFS_ROOT_REF_KEY) | |
1773 | ret = -ENOTEMPTY; | |
1774 | } | |
1775 | out: | |
1776 | btrfs_free_path(path); | |
1777 | return ret; | |
1778 | } | |
1779 | ||
ac8e9819 CM |
1780 | static noinline int key_in_sk(struct btrfs_key *key, |
1781 | struct btrfs_ioctl_search_key *sk) | |
1782 | { | |
abc6e134 CM |
1783 | struct btrfs_key test; |
1784 | int ret; | |
1785 | ||
1786 | test.objectid = sk->min_objectid; | |
1787 | test.type = sk->min_type; | |
1788 | test.offset = sk->min_offset; | |
1789 | ||
1790 | ret = btrfs_comp_cpu_keys(key, &test); | |
1791 | if (ret < 0) | |
ac8e9819 | 1792 | return 0; |
abc6e134 CM |
1793 | |
1794 | test.objectid = sk->max_objectid; | |
1795 | test.type = sk->max_type; | |
1796 | test.offset = sk->max_offset; | |
1797 | ||
1798 | ret = btrfs_comp_cpu_keys(key, &test); | |
1799 | if (ret > 0) | |
ac8e9819 CM |
1800 | return 0; |
1801 | return 1; | |
1802 | } | |
1803 | ||
1804 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1805 | struct btrfs_path *path, | |
1806 | struct btrfs_key *key, | |
1807 | struct btrfs_ioctl_search_key *sk, | |
1808 | char *buf, | |
1809 | unsigned long *sk_offset, | |
1810 | int *num_found) | |
1811 | { | |
1812 | u64 found_transid; | |
1813 | struct extent_buffer *leaf; | |
1814 | struct btrfs_ioctl_search_header sh; | |
1815 | unsigned long item_off; | |
1816 | unsigned long item_len; | |
1817 | int nritems; | |
1818 | int i; | |
1819 | int slot; | |
ac8e9819 CM |
1820 | int ret = 0; |
1821 | ||
1822 | leaf = path->nodes[0]; | |
1823 | slot = path->slots[0]; | |
1824 | nritems = btrfs_header_nritems(leaf); | |
1825 | ||
1826 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1827 | i = nritems; | |
1828 | goto advance_key; | |
1829 | } | |
1830 | found_transid = btrfs_header_generation(leaf); | |
1831 | ||
1832 | for (i = slot; i < nritems; i++) { | |
1833 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1834 | item_len = btrfs_item_size_nr(leaf, i); | |
1835 | ||
03b71c6c GP |
1836 | btrfs_item_key_to_cpu(leaf, key, i); |
1837 | if (!key_in_sk(key, sk)) | |
1838 | continue; | |
1839 | ||
1840 | if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
ac8e9819 CM |
1841 | item_len = 0; |
1842 | ||
1843 | if (sizeof(sh) + item_len + *sk_offset > | |
1844 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1845 | ret = 1; | |
1846 | goto overflow; | |
1847 | } | |
1848 | ||
ac8e9819 CM |
1849 | sh.objectid = key->objectid; |
1850 | sh.offset = key->offset; | |
1851 | sh.type = key->type; | |
1852 | sh.len = item_len; | |
1853 | sh.transid = found_transid; | |
1854 | ||
1855 | /* copy search result header */ | |
1856 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1857 | *sk_offset += sizeof(sh); | |
1858 | ||
1859 | if (item_len) { | |
1860 | char *p = buf + *sk_offset; | |
1861 | /* copy the item */ | |
1862 | read_extent_buffer(leaf, p, | |
1863 | item_off, item_len); | |
1864 | *sk_offset += item_len; | |
ac8e9819 | 1865 | } |
e2156867 | 1866 | (*num_found)++; |
ac8e9819 CM |
1867 | |
1868 | if (*num_found >= sk->nr_items) | |
1869 | break; | |
1870 | } | |
1871 | advance_key: | |
abc6e134 CM |
1872 | ret = 0; |
1873 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1874 | key->offset++; |
abc6e134 CM |
1875 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1876 | key->offset = 0; | |
ac8e9819 | 1877 | key->type++; |
abc6e134 CM |
1878 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1879 | key->offset = 0; | |
1880 | key->type = 0; | |
ac8e9819 | 1881 | key->objectid++; |
abc6e134 CM |
1882 | } else |
1883 | ret = 1; | |
ac8e9819 | 1884 | overflow: |
ac8e9819 CM |
1885 | return ret; |
1886 | } | |
1887 | ||
1888 | static noinline int search_ioctl(struct inode *inode, | |
1889 | struct btrfs_ioctl_search_args *args) | |
1890 | { | |
1891 | struct btrfs_root *root; | |
1892 | struct btrfs_key key; | |
ac8e9819 CM |
1893 | struct btrfs_path *path; |
1894 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1895 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1896 | int ret; | |
1897 | int num_found = 0; | |
1898 | unsigned long sk_offset = 0; | |
1899 | ||
1900 | path = btrfs_alloc_path(); | |
1901 | if (!path) | |
1902 | return -ENOMEM; | |
1903 | ||
1904 | if (sk->tree_id == 0) { | |
1905 | /* search the root of the inode that was passed */ | |
1906 | root = BTRFS_I(inode)->root; | |
1907 | } else { | |
1908 | key.objectid = sk->tree_id; | |
1909 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1910 | key.offset = (u64)-1; | |
1911 | root = btrfs_read_fs_root_no_name(info, &key); | |
1912 | if (IS_ERR(root)) { | |
1913 | printk(KERN_ERR "could not find root %llu\n", | |
1914 | sk->tree_id); | |
1915 | btrfs_free_path(path); | |
1916 | return -ENOENT; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | key.objectid = sk->min_objectid; | |
1921 | key.type = sk->min_type; | |
1922 | key.offset = sk->min_offset; | |
1923 | ||
ac8e9819 CM |
1924 | path->keep_locks = 1; |
1925 | ||
67871254 | 1926 | while (1) { |
6174d3cb | 1927 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
1928 | if (ret != 0) { |
1929 | if (ret > 0) | |
1930 | ret = 0; | |
1931 | goto err; | |
1932 | } | |
1933 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1934 | &sk_offset, &num_found); | |
b3b4aa74 | 1935 | btrfs_release_path(path); |
ac8e9819 CM |
1936 | if (ret || num_found >= sk->nr_items) |
1937 | break; | |
1938 | ||
1939 | } | |
1940 | ret = 0; | |
1941 | err: | |
1942 | sk->nr_items = num_found; | |
1943 | btrfs_free_path(path); | |
1944 | return ret; | |
1945 | } | |
1946 | ||
1947 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1948 | void __user *argp) | |
1949 | { | |
1950 | struct btrfs_ioctl_search_args *args; | |
1951 | struct inode *inode; | |
1952 | int ret; | |
1953 | ||
1954 | if (!capable(CAP_SYS_ADMIN)) | |
1955 | return -EPERM; | |
1956 | ||
2354d08f JL |
1957 | args = memdup_user(argp, sizeof(*args)); |
1958 | if (IS_ERR(args)) | |
1959 | return PTR_ERR(args); | |
ac8e9819 | 1960 | |
496ad9aa | 1961 | inode = file_inode(file); |
ac8e9819 CM |
1962 | ret = search_ioctl(inode, args); |
1963 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
1964 | ret = -EFAULT; | |
1965 | kfree(args); | |
1966 | return ret; | |
1967 | } | |
1968 | ||
98d377a0 | 1969 | /* |
ac8e9819 CM |
1970 | * Search INODE_REFs to identify path name of 'dirid' directory |
1971 | * in a 'tree_id' tree. and sets path name to 'name'. | |
1972 | */ | |
98d377a0 TH |
1973 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
1974 | u64 tree_id, u64 dirid, char *name) | |
1975 | { | |
1976 | struct btrfs_root *root; | |
1977 | struct btrfs_key key; | |
ac8e9819 | 1978 | char *ptr; |
98d377a0 TH |
1979 | int ret = -1; |
1980 | int slot; | |
1981 | int len; | |
1982 | int total_len = 0; | |
1983 | struct btrfs_inode_ref *iref; | |
1984 | struct extent_buffer *l; | |
1985 | struct btrfs_path *path; | |
1986 | ||
1987 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
1988 | name[0]='\0'; | |
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | path = btrfs_alloc_path(); | |
1993 | if (!path) | |
1994 | return -ENOMEM; | |
1995 | ||
ac8e9819 | 1996 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
1997 | |
1998 | key.objectid = tree_id; | |
1999 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2000 | key.offset = (u64)-1; | |
2001 | root = btrfs_read_fs_root_no_name(info, &key); | |
2002 | if (IS_ERR(root)) { | |
2003 | printk(KERN_ERR "could not find root %llu\n", tree_id); | |
8ad6fcab CM |
2004 | ret = -ENOENT; |
2005 | goto out; | |
98d377a0 TH |
2006 | } |
2007 | ||
2008 | key.objectid = dirid; | |
2009 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2010 | key.offset = (u64)-1; |
98d377a0 | 2011 | |
67871254 | 2012 | while (1) { |
98d377a0 TH |
2013 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2014 | if (ret < 0) | |
2015 | goto out; | |
18674c6c FDBM |
2016 | else if (ret > 0) { |
2017 | ret = btrfs_previous_item(root, path, dirid, | |
2018 | BTRFS_INODE_REF_KEY); | |
2019 | if (ret < 0) | |
2020 | goto out; | |
2021 | else if (ret > 0) { | |
2022 | ret = -ENOENT; | |
2023 | goto out; | |
2024 | } | |
2025 | } | |
98d377a0 TH |
2026 | |
2027 | l = path->nodes[0]; | |
2028 | slot = path->slots[0]; | |
2029 | btrfs_item_key_to_cpu(l, &key, slot); | |
2030 | ||
98d377a0 TH |
2031 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2032 | len = btrfs_inode_ref_name_len(l, iref); | |
2033 | ptr -= len + 1; | |
2034 | total_len += len + 1; | |
a696cf35 FDBM |
2035 | if (ptr < name) { |
2036 | ret = -ENAMETOOLONG; | |
98d377a0 | 2037 | goto out; |
a696cf35 | 2038 | } |
98d377a0 TH |
2039 | |
2040 | *(ptr + len) = '/'; | |
67871254 | 2041 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2042 | |
2043 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2044 | break; | |
2045 | ||
b3b4aa74 | 2046 | btrfs_release_path(path); |
98d377a0 | 2047 | key.objectid = key.offset; |
8ad6fcab | 2048 | key.offset = (u64)-1; |
98d377a0 | 2049 | dirid = key.objectid; |
98d377a0 | 2050 | } |
77906a50 | 2051 | memmove(name, ptr, total_len); |
67871254 | 2052 | name[total_len] = '\0'; |
98d377a0 TH |
2053 | ret = 0; |
2054 | out: | |
2055 | btrfs_free_path(path); | |
ac8e9819 CM |
2056 | return ret; |
2057 | } | |
2058 | ||
2059 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2060 | void __user *argp) | |
2061 | { | |
2062 | struct btrfs_ioctl_ino_lookup_args *args; | |
2063 | struct inode *inode; | |
2064 | int ret; | |
2065 | ||
2066 | if (!capable(CAP_SYS_ADMIN)) | |
2067 | return -EPERM; | |
2068 | ||
2354d08f JL |
2069 | args = memdup_user(argp, sizeof(*args)); |
2070 | if (IS_ERR(args)) | |
2071 | return PTR_ERR(args); | |
c2b96929 | 2072 | |
496ad9aa | 2073 | inode = file_inode(file); |
ac8e9819 | 2074 | |
1b53ac4d CM |
2075 | if (args->treeid == 0) |
2076 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2077 | ||
ac8e9819 CM |
2078 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2079 | args->treeid, args->objectid, | |
2080 | args->name); | |
2081 | ||
2082 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2083 | ret = -EFAULT; | |
2084 | ||
2085 | kfree(args); | |
98d377a0 TH |
2086 | return ret; |
2087 | } | |
2088 | ||
76dda93c YZ |
2089 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2090 | void __user *arg) | |
2091 | { | |
54563d41 | 2092 | struct dentry *parent = file->f_path.dentry; |
76dda93c YZ |
2093 | struct dentry *dentry; |
2094 | struct inode *dir = parent->d_inode; | |
2095 | struct inode *inode; | |
2096 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2097 | struct btrfs_root *dest = NULL; | |
2098 | struct btrfs_ioctl_vol_args *vol_args; | |
2099 | struct btrfs_trans_handle *trans; | |
c58aaad2 MX |
2100 | struct btrfs_block_rsv block_rsv; |
2101 | u64 qgroup_reserved; | |
76dda93c YZ |
2102 | int namelen; |
2103 | int ret; | |
2104 | int err = 0; | |
2105 | ||
76dda93c YZ |
2106 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2107 | if (IS_ERR(vol_args)) | |
2108 | return PTR_ERR(vol_args); | |
2109 | ||
2110 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2111 | namelen = strlen(vol_args->name); | |
2112 | if (strchr(vol_args->name, '/') || | |
2113 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2114 | err = -EINVAL; | |
2115 | goto out; | |
2116 | } | |
2117 | ||
a561be71 | 2118 | err = mnt_want_write_file(file); |
76dda93c YZ |
2119 | if (err) |
2120 | goto out; | |
2121 | ||
5c50c9b8 DS |
2122 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
2123 | if (err == -EINTR) | |
e43f998e | 2124 | goto out_drop_write; |
76dda93c YZ |
2125 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2126 | if (IS_ERR(dentry)) { | |
2127 | err = PTR_ERR(dentry); | |
2128 | goto out_unlock_dir; | |
2129 | } | |
2130 | ||
2131 | if (!dentry->d_inode) { | |
2132 | err = -ENOENT; | |
2133 | goto out_dput; | |
2134 | } | |
2135 | ||
2136 | inode = dentry->d_inode; | |
4260f7c7 | 2137 | dest = BTRFS_I(inode)->root; |
67871254 | 2138 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2139 | /* |
2140 | * Regular user. Only allow this with a special mount | |
2141 | * option, when the user has write+exec access to the | |
2142 | * subvol root, and when rmdir(2) would have been | |
2143 | * allowed. | |
2144 | * | |
2145 | * Note that this is _not_ check that the subvol is | |
2146 | * empty or doesn't contain data that we wouldn't | |
2147 | * otherwise be able to delete. | |
2148 | * | |
2149 | * Users who want to delete empty subvols should try | |
2150 | * rmdir(2). | |
2151 | */ | |
2152 | err = -EPERM; | |
2153 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2154 | goto out_dput; | |
2155 | ||
2156 | /* | |
2157 | * Do not allow deletion if the parent dir is the same | |
2158 | * as the dir to be deleted. That means the ioctl | |
2159 | * must be called on the dentry referencing the root | |
2160 | * of the subvol, not a random directory contained | |
2161 | * within it. | |
2162 | */ | |
2163 | err = -EINVAL; | |
2164 | if (root == dest) | |
2165 | goto out_dput; | |
2166 | ||
2167 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2168 | if (err) | |
2169 | goto out_dput; | |
4260f7c7 SW |
2170 | } |
2171 | ||
5c39da5b MX |
2172 | /* check if subvolume may be deleted by a user */ |
2173 | err = btrfs_may_delete(dir, dentry, 1); | |
2174 | if (err) | |
2175 | goto out_dput; | |
2176 | ||
33345d01 | 2177 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2178 | err = -EINVAL; |
2179 | goto out_dput; | |
2180 | } | |
2181 | ||
76dda93c YZ |
2182 | mutex_lock(&inode->i_mutex); |
2183 | err = d_invalidate(dentry); | |
2184 | if (err) | |
2185 | goto out_unlock; | |
2186 | ||
2187 | down_write(&root->fs_info->subvol_sem); | |
2188 | ||
2189 | err = may_destroy_subvol(dest); | |
2190 | if (err) | |
2191 | goto out_up_write; | |
2192 | ||
c58aaad2 MX |
2193 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2194 | /* | |
2195 | * One for dir inode, two for dir entries, two for root | |
2196 | * ref/backref. | |
2197 | */ | |
2198 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2199 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2200 | if (err) |
2201 | goto out_up_write; | |
2202 | ||
a22285a6 YZ |
2203 | trans = btrfs_start_transaction(root, 0); |
2204 | if (IS_ERR(trans)) { | |
2205 | err = PTR_ERR(trans); | |
c58aaad2 | 2206 | goto out_release; |
a22285a6 | 2207 | } |
c58aaad2 MX |
2208 | trans->block_rsv = &block_rsv; |
2209 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2210 | |
76dda93c YZ |
2211 | ret = btrfs_unlink_subvol(trans, root, dir, |
2212 | dest->root_key.objectid, | |
2213 | dentry->d_name.name, | |
2214 | dentry->d_name.len); | |
79787eaa JM |
2215 | if (ret) { |
2216 | err = ret; | |
2217 | btrfs_abort_transaction(trans, root, ret); | |
2218 | goto out_end_trans; | |
2219 | } | |
76dda93c YZ |
2220 | |
2221 | btrfs_record_root_in_trans(trans, dest); | |
2222 | ||
2223 | memset(&dest->root_item.drop_progress, 0, | |
2224 | sizeof(dest->root_item.drop_progress)); | |
2225 | dest->root_item.drop_level = 0; | |
2226 | btrfs_set_root_refs(&dest->root_item, 0); | |
2227 | ||
d68fc57b YZ |
2228 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
2229 | ret = btrfs_insert_orphan_item(trans, | |
2230 | root->fs_info->tree_root, | |
2231 | dest->root_key.objectid); | |
79787eaa JM |
2232 | if (ret) { |
2233 | btrfs_abort_transaction(trans, root, ret); | |
2234 | err = ret; | |
2235 | goto out_end_trans; | |
2236 | } | |
d68fc57b | 2237 | } |
dd5f9615 SB |
2238 | |
2239 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2240 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
2241 | dest->root_key.objectid); | |
2242 | if (ret && ret != -ENOENT) { | |
2243 | btrfs_abort_transaction(trans, root, ret); | |
2244 | err = ret; | |
2245 | goto out_end_trans; | |
2246 | } | |
2247 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { | |
2248 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2249 | dest->root_item.received_uuid, | |
2250 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
2251 | dest->root_key.objectid); | |
2252 | if (ret && ret != -ENOENT) { | |
2253 | btrfs_abort_transaction(trans, root, ret); | |
2254 | err = ret; | |
2255 | goto out_end_trans; | |
2256 | } | |
2257 | } | |
2258 | ||
79787eaa | 2259 | out_end_trans: |
c58aaad2 MX |
2260 | trans->block_rsv = NULL; |
2261 | trans->bytes_reserved = 0; | |
531cb13f | 2262 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2263 | if (ret && !err) |
2264 | err = ret; | |
76dda93c | 2265 | inode->i_flags |= S_DEAD; |
c58aaad2 MX |
2266 | out_release: |
2267 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
76dda93c YZ |
2268 | out_up_write: |
2269 | up_write(&root->fs_info->subvol_sem); | |
2270 | out_unlock: | |
2271 | mutex_unlock(&inode->i_mutex); | |
2272 | if (!err) { | |
efefb143 | 2273 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
2274 | btrfs_invalidate_inodes(dest); |
2275 | d_delete(dentry); | |
fa6ac876 LB |
2276 | |
2277 | /* the last ref */ | |
2278 | if (dest->cache_inode) { | |
2279 | iput(dest->cache_inode); | |
2280 | dest->cache_inode = NULL; | |
2281 | } | |
76dda93c YZ |
2282 | } |
2283 | out_dput: | |
2284 | dput(dentry); | |
2285 | out_unlock_dir: | |
2286 | mutex_unlock(&dir->i_mutex); | |
e43f998e | 2287 | out_drop_write: |
2a79f17e | 2288 | mnt_drop_write_file(file); |
76dda93c YZ |
2289 | out: |
2290 | kfree(vol_args); | |
2291 | return err; | |
2292 | } | |
2293 | ||
1e701a32 | 2294 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2295 | { |
496ad9aa | 2296 | struct inode *inode = file_inode(file); |
f46b5a66 | 2297 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2298 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2299 | int ret; |
2300 | ||
25122d15 ID |
2301 | ret = mnt_want_write_file(file); |
2302 | if (ret) | |
2303 | return ret; | |
b83cc969 | 2304 | |
25122d15 ID |
2305 | if (btrfs_root_readonly(root)) { |
2306 | ret = -EROFS; | |
2307 | goto out; | |
5ac00add | 2308 | } |
f46b5a66 CH |
2309 | |
2310 | switch (inode->i_mode & S_IFMT) { | |
2311 | case S_IFDIR: | |
e441d54d CM |
2312 | if (!capable(CAP_SYS_ADMIN)) { |
2313 | ret = -EPERM; | |
2314 | goto out; | |
2315 | } | |
de78b51a | 2316 | ret = btrfs_defrag_root(root); |
8929ecfa YZ |
2317 | if (ret) |
2318 | goto out; | |
de78b51a | 2319 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
f46b5a66 CH |
2320 | break; |
2321 | case S_IFREG: | |
e441d54d CM |
2322 | if (!(file->f_mode & FMODE_WRITE)) { |
2323 | ret = -EINVAL; | |
2324 | goto out; | |
2325 | } | |
1e701a32 CM |
2326 | |
2327 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2328 | if (!range) { | |
2329 | ret = -ENOMEM; | |
2330 | goto out; | |
2331 | } | |
2332 | ||
2333 | if (argp) { | |
2334 | if (copy_from_user(range, argp, | |
2335 | sizeof(*range))) { | |
2336 | ret = -EFAULT; | |
2337 | kfree(range); | |
683be16e | 2338 | goto out; |
1e701a32 CM |
2339 | } |
2340 | /* compression requires us to start the IO */ | |
2341 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2342 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2343 | range->extent_thresh = (u32)-1; | |
2344 | } | |
2345 | } else { | |
2346 | /* the rest are all set to zero by kzalloc */ | |
2347 | range->len = (u64)-1; | |
2348 | } | |
496ad9aa | 2349 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2350 | range, 0, 0); |
2351 | if (ret > 0) | |
2352 | ret = 0; | |
1e701a32 | 2353 | kfree(range); |
f46b5a66 | 2354 | break; |
8929ecfa YZ |
2355 | default: |
2356 | ret = -EINVAL; | |
f46b5a66 | 2357 | } |
e441d54d | 2358 | out: |
25122d15 | 2359 | mnt_drop_write_file(file); |
e441d54d | 2360 | return ret; |
f46b5a66 CH |
2361 | } |
2362 | ||
b2950863 | 2363 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2364 | { |
2365 | struct btrfs_ioctl_vol_args *vol_args; | |
2366 | int ret; | |
2367 | ||
e441d54d CM |
2368 | if (!capable(CAP_SYS_ADMIN)) |
2369 | return -EPERM; | |
2370 | ||
5ac00add SB |
2371 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2372 | 1)) { | |
e57138b3 | 2373 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
2374 | } |
2375 | ||
5ac00add | 2376 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2377 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2378 | if (IS_ERR(vol_args)) { |
2379 | ret = PTR_ERR(vol_args); | |
2380 | goto out; | |
2381 | } | |
f46b5a66 | 2382 | |
5516e595 | 2383 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2384 | ret = btrfs_init_new_device(root, vol_args->name); |
2385 | ||
f46b5a66 | 2386 | kfree(vol_args); |
c9e9f97b ID |
2387 | out: |
2388 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2389 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2390 | return ret; |
2391 | } | |
2392 | ||
da24927b | 2393 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2394 | { |
496ad9aa | 2395 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
2396 | struct btrfs_ioctl_vol_args *vol_args; |
2397 | int ret; | |
2398 | ||
e441d54d CM |
2399 | if (!capable(CAP_SYS_ADMIN)) |
2400 | return -EPERM; | |
2401 | ||
da24927b MX |
2402 | ret = mnt_want_write_file(file); |
2403 | if (ret) | |
2404 | return ret; | |
c146afad | 2405 | |
dae7b665 | 2406 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2407 | if (IS_ERR(vol_args)) { |
2408 | ret = PTR_ERR(vol_args); | |
2409 | goto out; | |
2410 | } | |
f46b5a66 | 2411 | |
5516e595 | 2412 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 2413 | |
183860f6 AJ |
2414 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2415 | 1)) { | |
2416 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2417 | goto out; | |
2418 | } | |
2419 | ||
2420 | mutex_lock(&root->fs_info->volume_mutex); | |
2421 | ret = btrfs_rm_device(root, vol_args->name); | |
c9e9f97b | 2422 | mutex_unlock(&root->fs_info->volume_mutex); |
5ac00add | 2423 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
183860f6 AJ |
2424 | |
2425 | out: | |
2426 | kfree(vol_args); | |
4ac20c70 | 2427 | mnt_drop_write_file(file); |
f46b5a66 CH |
2428 | return ret; |
2429 | } | |
2430 | ||
475f6387 JS |
2431 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2432 | { | |
027ed2f0 | 2433 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2434 | struct btrfs_device *device; |
2435 | struct btrfs_device *next; | |
2436 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2437 | int ret = 0; |
475f6387 JS |
2438 | |
2439 | if (!capable(CAP_SYS_ADMIN)) | |
2440 | return -EPERM; | |
2441 | ||
027ed2f0 LZ |
2442 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2443 | if (!fi_args) | |
2444 | return -ENOMEM; | |
2445 | ||
f7171750 | 2446 | mutex_lock(&fs_devices->device_list_mutex); |
027ed2f0 LZ |
2447 | fi_args->num_devices = fs_devices->num_devices; |
2448 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 | 2449 | |
475f6387 | 2450 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2451 | if (device->devid > fi_args->max_id) |
2452 | fi_args->max_id = device->devid; | |
475f6387 JS |
2453 | } |
2454 | mutex_unlock(&fs_devices->device_list_mutex); | |
2455 | ||
027ed2f0 LZ |
2456 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2457 | ret = -EFAULT; | |
475f6387 | 2458 | |
027ed2f0 LZ |
2459 | kfree(fi_args); |
2460 | return ret; | |
475f6387 JS |
2461 | } |
2462 | ||
2463 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2464 | { | |
2465 | struct btrfs_ioctl_dev_info_args *di_args; | |
2466 | struct btrfs_device *dev; | |
2467 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2468 | int ret = 0; | |
2469 | char *s_uuid = NULL; | |
475f6387 JS |
2470 | |
2471 | if (!capable(CAP_SYS_ADMIN)) | |
2472 | return -EPERM; | |
2473 | ||
2474 | di_args = memdup_user(arg, sizeof(*di_args)); | |
2475 | if (IS_ERR(di_args)) | |
2476 | return PTR_ERR(di_args); | |
2477 | ||
dd5f9615 | 2478 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
475f6387 JS |
2479 | s_uuid = di_args->uuid; |
2480 | ||
2481 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2482 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2483 | |
2484 | if (!dev) { | |
2485 | ret = -ENODEV; | |
2486 | goto out; | |
2487 | } | |
2488 | ||
2489 | di_args->devid = dev->devid; | |
2490 | di_args->bytes_used = dev->bytes_used; | |
2491 | di_args->total_bytes = dev->total_bytes; | |
2492 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); | |
a27202fb | 2493 | if (dev->name) { |
606686ee JB |
2494 | struct rcu_string *name; |
2495 | ||
2496 | rcu_read_lock(); | |
2497 | name = rcu_dereference(dev->name); | |
2498 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2499 | rcu_read_unlock(); | |
a27202fb JM |
2500 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2501 | } else { | |
99ba55ad | 2502 | di_args->path[0] = '\0'; |
a27202fb | 2503 | } |
475f6387 JS |
2504 | |
2505 | out: | |
55793c0d | 2506 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2507 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2508 | ret = -EFAULT; | |
2509 | ||
2510 | kfree(di_args); | |
2511 | return ret; | |
2512 | } | |
2513 | ||
416161db MF |
2514 | static struct page *extent_same_get_page(struct inode *inode, u64 off) |
2515 | { | |
2516 | struct page *page; | |
2517 | pgoff_t index; | |
2518 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2519 | ||
2520 | index = off >> PAGE_CACHE_SHIFT; | |
2521 | ||
2522 | page = grab_cache_page(inode->i_mapping, index); | |
2523 | if (!page) | |
2524 | return NULL; | |
2525 | ||
2526 | if (!PageUptodate(page)) { | |
2527 | if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, | |
2528 | 0)) | |
2529 | return NULL; | |
2530 | lock_page(page); | |
2531 | if (!PageUptodate(page)) { | |
2532 | unlock_page(page); | |
2533 | page_cache_release(page); | |
2534 | return NULL; | |
2535 | } | |
2536 | } | |
2537 | unlock_page(page); | |
2538 | ||
2539 | return page; | |
2540 | } | |
2541 | ||
77fe20dc MF |
2542 | static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) |
2543 | { | |
2544 | /* do any pending delalloc/csum calc on src, one way or | |
2545 | another, and lock file content */ | |
2546 | while (1) { | |
2547 | struct btrfs_ordered_extent *ordered; | |
2548 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2549 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
2550 | off + len - 1); | |
2551 | if (!ordered && | |
2552 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, | |
2553 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) | |
2554 | break; | |
2555 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2556 | if (ordered) | |
2557 | btrfs_put_ordered_extent(ordered); | |
2558 | btrfs_wait_ordered_range(inode, off, len); | |
2559 | } | |
2560 | } | |
2561 | ||
416161db MF |
2562 | static void btrfs_double_unlock(struct inode *inode1, u64 loff1, |
2563 | struct inode *inode2, u64 loff2, u64 len) | |
2564 | { | |
2565 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); | |
2566 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); | |
2567 | ||
2568 | mutex_unlock(&inode1->i_mutex); | |
2569 | mutex_unlock(&inode2->i_mutex); | |
2570 | } | |
2571 | ||
2572 | static void btrfs_double_lock(struct inode *inode1, u64 loff1, | |
2573 | struct inode *inode2, u64 loff2, u64 len) | |
2574 | { | |
2575 | if (inode1 < inode2) { | |
2576 | swap(inode1, inode2); | |
2577 | swap(loff1, loff2); | |
2578 | } | |
2579 | ||
2580 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); | |
2581 | lock_extent_range(inode1, loff1, len); | |
2582 | if (inode1 != inode2) { | |
2583 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); | |
2584 | lock_extent_range(inode2, loff2, len); | |
2585 | } | |
2586 | } | |
2587 | ||
2588 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, | |
2589 | u64 dst_loff, u64 len) | |
2590 | { | |
2591 | int ret = 0; | |
2592 | struct page *src_page, *dst_page; | |
2593 | unsigned int cmp_len = PAGE_CACHE_SIZE; | |
2594 | void *addr, *dst_addr; | |
2595 | ||
2596 | while (len) { | |
2597 | if (len < PAGE_CACHE_SIZE) | |
2598 | cmp_len = len; | |
2599 | ||
2600 | src_page = extent_same_get_page(src, loff); | |
2601 | if (!src_page) | |
2602 | return -EINVAL; | |
2603 | dst_page = extent_same_get_page(dst, dst_loff); | |
2604 | if (!dst_page) { | |
2605 | page_cache_release(src_page); | |
2606 | return -EINVAL; | |
2607 | } | |
2608 | addr = kmap_atomic(src_page); | |
2609 | dst_addr = kmap_atomic(dst_page); | |
2610 | ||
2611 | flush_dcache_page(src_page); | |
2612 | flush_dcache_page(dst_page); | |
2613 | ||
2614 | if (memcmp(addr, dst_addr, cmp_len)) | |
2615 | ret = BTRFS_SAME_DATA_DIFFERS; | |
2616 | ||
2617 | kunmap_atomic(addr); | |
2618 | kunmap_atomic(dst_addr); | |
2619 | page_cache_release(src_page); | |
2620 | page_cache_release(dst_page); | |
2621 | ||
2622 | if (ret) | |
2623 | break; | |
2624 | ||
2625 | loff += cmp_len; | |
2626 | dst_loff += cmp_len; | |
2627 | len -= cmp_len; | |
2628 | } | |
2629 | ||
2630 | return ret; | |
2631 | } | |
2632 | ||
2633 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) | |
2634 | { | |
2635 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; | |
2636 | ||
2637 | if (off + len > inode->i_size || off + len < off) | |
2638 | return -EINVAL; | |
2639 | /* Check that we are block aligned - btrfs_clone() requires this */ | |
2640 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) | |
2641 | return -EINVAL; | |
2642 | ||
2643 | return 0; | |
2644 | } | |
2645 | ||
2646 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, | |
2647 | struct inode *dst, u64 dst_loff) | |
2648 | { | |
2649 | int ret; | |
2650 | ||
2651 | /* | |
2652 | * btrfs_clone() can't handle extents in the same file | |
2653 | * yet. Once that works, we can drop this check and replace it | |
2654 | * with a check for the same inode, but overlapping extents. | |
2655 | */ | |
2656 | if (src == dst) | |
2657 | return -EINVAL; | |
2658 | ||
2659 | btrfs_double_lock(src, loff, dst, dst_loff, len); | |
2660 | ||
2661 | ret = extent_same_check_offsets(src, loff, len); | |
2662 | if (ret) | |
2663 | goto out_unlock; | |
2664 | ||
2665 | ret = extent_same_check_offsets(dst, dst_loff, len); | |
2666 | if (ret) | |
2667 | goto out_unlock; | |
2668 | ||
2669 | /* don't make the dst file partly checksummed */ | |
2670 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2671 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { | |
2672 | ret = -EINVAL; | |
2673 | goto out_unlock; | |
2674 | } | |
2675 | ||
2676 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); | |
2677 | if (ret == 0) | |
2678 | ret = btrfs_clone(src, dst, loff, len, len, dst_loff); | |
2679 | ||
2680 | out_unlock: | |
2681 | btrfs_double_unlock(src, loff, dst, dst_loff, len); | |
2682 | ||
2683 | return ret; | |
2684 | } | |
2685 | ||
2686 | #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) | |
2687 | ||
2688 | static long btrfs_ioctl_file_extent_same(struct file *file, | |
2689 | void __user *argp) | |
2690 | { | |
cbf8b8ca MF |
2691 | struct btrfs_ioctl_same_args tmp; |
2692 | struct btrfs_ioctl_same_args *same; | |
2693 | struct btrfs_ioctl_same_extent_info *info; | |
416161db MF |
2694 | struct inode *src = file->f_dentry->d_inode; |
2695 | struct file *dst_file = NULL; | |
2696 | struct inode *dst; | |
2697 | u64 off; | |
2698 | u64 len; | |
2699 | int i; | |
2700 | int ret; | |
cbf8b8ca | 2701 | unsigned long size; |
416161db MF |
2702 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
2703 | bool is_admin = capable(CAP_SYS_ADMIN); | |
2704 | ||
2705 | if (!(file->f_mode & FMODE_READ)) | |
2706 | return -EINVAL; | |
2707 | ||
2708 | ret = mnt_want_write_file(file); | |
2709 | if (ret) | |
2710 | return ret; | |
2711 | ||
cbf8b8ca | 2712 | if (copy_from_user(&tmp, |
416161db | 2713 | (struct btrfs_ioctl_same_args __user *)argp, |
cbf8b8ca | 2714 | sizeof(tmp))) { |
416161db MF |
2715 | ret = -EFAULT; |
2716 | goto out; | |
2717 | } | |
2718 | ||
cbf8b8ca MF |
2719 | size = sizeof(tmp) + |
2720 | tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); | |
2721 | ||
229eed43 | 2722 | same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); |
cbf8b8ca | 2723 | |
229eed43 GB |
2724 | if (IS_ERR(same)) { |
2725 | ret = PTR_ERR(same); | |
cbf8b8ca MF |
2726 | goto out; |
2727 | } | |
2728 | ||
2729 | off = same->logical_offset; | |
2730 | len = same->length; | |
416161db MF |
2731 | |
2732 | /* | |
2733 | * Limit the total length we will dedupe for each operation. | |
2734 | * This is intended to bound the total time spent in this | |
2735 | * ioctl to something sane. | |
2736 | */ | |
2737 | if (len > BTRFS_MAX_DEDUPE_LEN) | |
2738 | len = BTRFS_MAX_DEDUPE_LEN; | |
2739 | ||
2740 | if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { | |
2741 | /* | |
2742 | * Btrfs does not support blocksize < page_size. As a | |
2743 | * result, btrfs_cmp_data() won't correctly handle | |
2744 | * this situation without an update. | |
2745 | */ | |
2746 | ret = -EINVAL; | |
2747 | goto out; | |
2748 | } | |
2749 | ||
2750 | ret = -EISDIR; | |
2751 | if (S_ISDIR(src->i_mode)) | |
2752 | goto out; | |
2753 | ||
2754 | ret = -EACCES; | |
2755 | if (!S_ISREG(src->i_mode)) | |
2756 | goto out; | |
2757 | ||
cbf8b8ca MF |
2758 | /* pre-format output fields to sane values */ |
2759 | for (i = 0; i < same->dest_count; i++) { | |
2760 | same->info[i].bytes_deduped = 0ULL; | |
2761 | same->info[i].status = 0; | |
2762 | } | |
416161db | 2763 | |
cbf8b8ca MF |
2764 | ret = 0; |
2765 | for (i = 0; i < same->dest_count; i++) { | |
2766 | info = &same->info[i]; | |
416161db | 2767 | |
cbf8b8ca | 2768 | dst_file = fget(info->fd); |
416161db | 2769 | if (!dst_file) { |
cbf8b8ca | 2770 | info->status = -EBADF; |
416161db MF |
2771 | goto next; |
2772 | } | |
2773 | ||
2774 | if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { | |
cbf8b8ca | 2775 | info->status = -EINVAL; |
416161db MF |
2776 | goto next; |
2777 | } | |
2778 | ||
cbf8b8ca | 2779 | info->status = -EXDEV; |
416161db MF |
2780 | if (file->f_path.mnt != dst_file->f_path.mnt) |
2781 | goto next; | |
2782 | ||
2783 | dst = dst_file->f_dentry->d_inode; | |
2784 | if (src->i_sb != dst->i_sb) | |
2785 | goto next; | |
2786 | ||
2787 | if (S_ISDIR(dst->i_mode)) { | |
cbf8b8ca | 2788 | info->status = -EISDIR; |
416161db MF |
2789 | goto next; |
2790 | } | |
2791 | ||
2792 | if (!S_ISREG(dst->i_mode)) { | |
cbf8b8ca | 2793 | info->status = -EACCES; |
416161db MF |
2794 | goto next; |
2795 | } | |
2796 | ||
cbf8b8ca MF |
2797 | info->status = btrfs_extent_same(src, off, len, dst, |
2798 | info->logical_offset); | |
2799 | if (info->status == 0) | |
2800 | info->bytes_deduped += len; | |
416161db MF |
2801 | |
2802 | next: | |
2803 | if (dst_file) | |
2804 | fput(dst_file); | |
416161db MF |
2805 | } |
2806 | ||
cbf8b8ca MF |
2807 | ret = copy_to_user(argp, same, size); |
2808 | if (ret) | |
2809 | ret = -EFAULT; | |
2810 | ||
416161db MF |
2811 | out: |
2812 | mnt_drop_write_file(file); | |
2813 | return ret; | |
2814 | } | |
2815 | ||
32b7c687 MF |
2816 | /** |
2817 | * btrfs_clone() - clone a range from inode file to another | |
2818 | * | |
2819 | * @src: Inode to clone from | |
2820 | * @inode: Inode to clone to | |
2821 | * @off: Offset within source to start clone from | |
2822 | * @olen: Original length, passed by user, of range to clone | |
2823 | * @olen_aligned: Block-aligned value of olen, extent_same uses | |
2824 | * identical values here | |
2825 | * @destoff: Offset within @inode to start clone | |
2826 | */ | |
2827 | static int btrfs_clone(struct inode *src, struct inode *inode, | |
2828 | u64 off, u64 olen, u64 olen_aligned, u64 destoff) | |
f46b5a66 | 2829 | { |
f46b5a66 | 2830 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 | 2831 | struct btrfs_path *path = NULL; |
f46b5a66 | 2832 | struct extent_buffer *leaf; |
32b7c687 MF |
2833 | struct btrfs_trans_handle *trans; |
2834 | char *buf = NULL; | |
ae01a0ab | 2835 | struct btrfs_key key; |
f46b5a66 CH |
2836 | u32 nritems; |
2837 | int slot; | |
ae01a0ab | 2838 | int ret; |
32b7c687 | 2839 | u64 len = olen_aligned; |
ae01a0ab YZ |
2840 | |
2841 | ret = -ENOMEM; | |
2842 | buf = vmalloc(btrfs_level_size(root, 0)); | |
2843 | if (!buf) | |
32b7c687 | 2844 | return ret; |
ae01a0ab YZ |
2845 | |
2846 | path = btrfs_alloc_path(); | |
2847 | if (!path) { | |
2848 | vfree(buf); | |
32b7c687 | 2849 | return ret; |
d525e8ab LZ |
2850 | } |
2851 | ||
32b7c687 | 2852 | path->reada = 2; |
c5c9cd4d | 2853 | /* clone data */ |
33345d01 | 2854 | key.objectid = btrfs_ino(src); |
ae01a0ab YZ |
2855 | key.type = BTRFS_EXTENT_DATA_KEY; |
2856 | key.offset = 0; | |
f46b5a66 CH |
2857 | |
2858 | while (1) { | |
2859 | /* | |
2860 | * note the key will change type as we walk through the | |
2861 | * tree. | |
2862 | */ | |
362a20c5 DS |
2863 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
2864 | 0, 0); | |
f46b5a66 CH |
2865 | if (ret < 0) |
2866 | goto out; | |
2867 | ||
ae01a0ab YZ |
2868 | nritems = btrfs_header_nritems(path->nodes[0]); |
2869 | if (path->slots[0] >= nritems) { | |
362a20c5 | 2870 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
2871 | if (ret < 0) |
2872 | goto out; | |
2873 | if (ret > 0) | |
2874 | break; | |
ae01a0ab | 2875 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
2876 | } |
2877 | leaf = path->nodes[0]; | |
2878 | slot = path->slots[0]; | |
f46b5a66 | 2879 | |
ae01a0ab | 2880 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 2881 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 2882 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
2883 | break; |
2884 | ||
c5c9cd4d SW |
2885 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
2886 | struct btrfs_file_extent_item *extent; | |
2887 | int type; | |
31840ae1 ZY |
2888 | u32 size; |
2889 | struct btrfs_key new_key; | |
c5c9cd4d SW |
2890 | u64 disko = 0, diskl = 0; |
2891 | u64 datao = 0, datal = 0; | |
2892 | u8 comp; | |
b5384d48 | 2893 | u64 endoff; |
31840ae1 ZY |
2894 | |
2895 | size = btrfs_item_size_nr(leaf, slot); | |
2896 | read_extent_buffer(leaf, buf, | |
2897 | btrfs_item_ptr_offset(leaf, slot), | |
2898 | size); | |
c5c9cd4d SW |
2899 | |
2900 | extent = btrfs_item_ptr(leaf, slot, | |
2901 | struct btrfs_file_extent_item); | |
2902 | comp = btrfs_file_extent_compression(leaf, extent); | |
2903 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
2904 | if (type == BTRFS_FILE_EXTENT_REG || |
2905 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
2906 | disko = btrfs_file_extent_disk_bytenr(leaf, |
2907 | extent); | |
2908 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
2909 | extent); | |
c5c9cd4d | 2910 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
2911 | datal = btrfs_file_extent_num_bytes(leaf, |
2912 | extent); | |
c5c9cd4d SW |
2913 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2914 | /* take upper bound, may be compressed */ | |
2915 | datal = btrfs_file_extent_ram_bytes(leaf, | |
2916 | extent); | |
2917 | } | |
b3b4aa74 | 2918 | btrfs_release_path(path); |
31840ae1 | 2919 | |
050006a7 | 2920 | if (key.offset + datal <= off || |
aa42ffd9 | 2921 | key.offset >= off + len - 1) |
c5c9cd4d SW |
2922 | goto next; |
2923 | ||
31840ae1 | 2924 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 2925 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
2926 | if (off <= key.offset) |
2927 | new_key.offset = key.offset + destoff - off; | |
2928 | else | |
2929 | new_key.offset = destoff; | |
31840ae1 | 2930 | |
b6f3409b SW |
2931 | /* |
2932 | * 1 - adjusting old extent (we may have to split it) | |
2933 | * 1 - add new extent | |
2934 | * 1 - inode update | |
2935 | */ | |
2936 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
2937 | if (IS_ERR(trans)) { |
2938 | ret = PTR_ERR(trans); | |
2939 | goto out; | |
2940 | } | |
2941 | ||
c8a894d7 CM |
2942 | if (type == BTRFS_FILE_EXTENT_REG || |
2943 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
2944 | /* |
2945 | * a | --- range to clone ---| b | |
2946 | * | ------------- extent ------------- | | |
2947 | */ | |
2948 | ||
2949 | /* substract range b */ | |
2950 | if (key.offset + datal > off + len) | |
2951 | datal = off + len - key.offset; | |
2952 | ||
2953 | /* substract range a */ | |
a22285a6 YZ |
2954 | if (off > key.offset) { |
2955 | datao += off - key.offset; | |
2956 | datal -= off - key.offset; | |
2957 | } | |
2958 | ||
5dc562c5 | 2959 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
2960 | new_key.offset, |
2961 | new_key.offset + datal, | |
2671485d | 2962 | 1); |
79787eaa JM |
2963 | if (ret) { |
2964 | btrfs_abort_transaction(trans, root, | |
2965 | ret); | |
2966 | btrfs_end_transaction(trans, root); | |
2967 | goto out; | |
2968 | } | |
a22285a6 | 2969 | |
c5c9cd4d SW |
2970 | ret = btrfs_insert_empty_item(trans, root, path, |
2971 | &new_key, size); | |
79787eaa JM |
2972 | if (ret) { |
2973 | btrfs_abort_transaction(trans, root, | |
2974 | ret); | |
2975 | btrfs_end_transaction(trans, root); | |
2976 | goto out; | |
2977 | } | |
c5c9cd4d SW |
2978 | |
2979 | leaf = path->nodes[0]; | |
2980 | slot = path->slots[0]; | |
2981 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
2982 | btrfs_item_ptr_offset(leaf, slot), |
2983 | size); | |
ae01a0ab | 2984 | |
c5c9cd4d | 2985 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 2986 | struct btrfs_file_extent_item); |
c5c9cd4d | 2987 | |
c5c9cd4d SW |
2988 | /* disko == 0 means it's a hole */ |
2989 | if (!disko) | |
2990 | datao = 0; | |
c5c9cd4d SW |
2991 | |
2992 | btrfs_set_file_extent_offset(leaf, extent, | |
2993 | datao); | |
2994 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
2995 | datal); | |
2996 | if (disko) { | |
2997 | inode_add_bytes(inode, datal); | |
ae01a0ab | 2998 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
2999 | disko, diskl, 0, |
3000 | root->root_key.objectid, | |
33345d01 | 3001 | btrfs_ino(inode), |
66d7e7f0 AJ |
3002 | new_key.offset - datao, |
3003 | 0); | |
79787eaa JM |
3004 | if (ret) { |
3005 | btrfs_abort_transaction(trans, | |
3006 | root, | |
3007 | ret); | |
3008 | btrfs_end_transaction(trans, | |
3009 | root); | |
3010 | goto out; | |
3011 | ||
3012 | } | |
f46b5a66 | 3013 | } |
c5c9cd4d SW |
3014 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3015 | u64 skip = 0; | |
3016 | u64 trim = 0; | |
3017 | if (off > key.offset) { | |
3018 | skip = off - key.offset; | |
3019 | new_key.offset += skip; | |
3020 | } | |
d397712b | 3021 | |
aa42ffd9 LB |
3022 | if (key.offset + datal > off + len) |
3023 | trim = key.offset + datal - (off + len); | |
d397712b | 3024 | |
c5c9cd4d | 3025 | if (comp && (skip || trim)) { |
c5c9cd4d | 3026 | ret = -EINVAL; |
a22285a6 | 3027 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
3028 | goto out; |
3029 | } | |
3030 | size -= skip + trim; | |
3031 | datal -= skip + trim; | |
a22285a6 | 3032 | |
5dc562c5 | 3033 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
3034 | new_key.offset, |
3035 | new_key.offset + datal, | |
2671485d | 3036 | 1); |
79787eaa JM |
3037 | if (ret) { |
3038 | btrfs_abort_transaction(trans, root, | |
3039 | ret); | |
3040 | btrfs_end_transaction(trans, root); | |
3041 | goto out; | |
3042 | } | |
a22285a6 | 3043 | |
c5c9cd4d SW |
3044 | ret = btrfs_insert_empty_item(trans, root, path, |
3045 | &new_key, size); | |
79787eaa JM |
3046 | if (ret) { |
3047 | btrfs_abort_transaction(trans, root, | |
3048 | ret); | |
3049 | btrfs_end_transaction(trans, root); | |
3050 | goto out; | |
3051 | } | |
c5c9cd4d SW |
3052 | |
3053 | if (skip) { | |
d397712b CM |
3054 | u32 start = |
3055 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
3056 | memmove(buf+start, buf+start+skip, |
3057 | datal); | |
3058 | } | |
3059 | ||
3060 | leaf = path->nodes[0]; | |
3061 | slot = path->slots[0]; | |
3062 | write_extent_buffer(leaf, buf, | |
3063 | btrfs_item_ptr_offset(leaf, slot), | |
3064 | size); | |
3065 | inode_add_bytes(inode, datal); | |
f46b5a66 | 3066 | } |
c5c9cd4d SW |
3067 | |
3068 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3069 | btrfs_release_path(path); |
c5c9cd4d | 3070 | |
0c4d2d95 | 3071 | inode_inc_iversion(inode); |
a22285a6 | 3072 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
3073 | |
3074 | /* | |
3075 | * we round up to the block size at eof when | |
3076 | * determining which extents to clone above, | |
3077 | * but shouldn't round up the file size | |
3078 | */ | |
3079 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
3080 | if (endoff > destoff+olen) |
3081 | endoff = destoff+olen; | |
b5384d48 SW |
3082 | if (endoff > inode->i_size) |
3083 | btrfs_i_size_write(inode, endoff); | |
3084 | ||
a22285a6 | 3085 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
3086 | if (ret) { |
3087 | btrfs_abort_transaction(trans, root, ret); | |
3088 | btrfs_end_transaction(trans, root); | |
3089 | goto out; | |
3090 | } | |
3091 | ret = btrfs_end_transaction(trans, root); | |
a22285a6 | 3092 | } |
d397712b | 3093 | next: |
b3b4aa74 | 3094 | btrfs_release_path(path); |
f46b5a66 | 3095 | key.offset++; |
f46b5a66 | 3096 | } |
f46b5a66 | 3097 | ret = 0; |
32b7c687 | 3098 | |
f46b5a66 | 3099 | out: |
b3b4aa74 | 3100 | btrfs_release_path(path); |
32b7c687 MF |
3101 | btrfs_free_path(path); |
3102 | vfree(buf); | |
3103 | return ret; | |
3104 | } | |
3105 | ||
3106 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, | |
3107 | u64 off, u64 olen, u64 destoff) | |
3108 | { | |
54563d41 | 3109 | struct inode *inode = file_inode(file); |
32b7c687 MF |
3110 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3111 | struct fd src_file; | |
3112 | struct inode *src; | |
3113 | int ret; | |
3114 | u64 len = olen; | |
3115 | u64 bs = root->fs_info->sb->s_blocksize; | |
3116 | int same_inode = 0; | |
3117 | ||
3118 | /* | |
3119 | * TODO: | |
3120 | * - split compressed inline extents. annoying: we need to | |
3121 | * decompress into destination's address_space (the file offset | |
3122 | * may change, so source mapping won't do), then recompress (or | |
3123 | * otherwise reinsert) a subrange. | |
3124 | * - allow ranges within the same file to be cloned (provided | |
3125 | * they don't overlap)? | |
3126 | */ | |
3127 | ||
3128 | /* the destination must be opened for writing */ | |
3129 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) | |
3130 | return -EINVAL; | |
3131 | ||
3132 | if (btrfs_root_readonly(root)) | |
3133 | return -EROFS; | |
3134 | ||
3135 | ret = mnt_want_write_file(file); | |
3136 | if (ret) | |
3137 | return ret; | |
3138 | ||
3139 | src_file = fdget(srcfd); | |
3140 | if (!src_file.file) { | |
3141 | ret = -EBADF; | |
3142 | goto out_drop_write; | |
3143 | } | |
3144 | ||
3145 | ret = -EXDEV; | |
3146 | if (src_file.file->f_path.mnt != file->f_path.mnt) | |
3147 | goto out_fput; | |
3148 | ||
3149 | src = file_inode(src_file.file); | |
3150 | ||
3151 | ret = -EINVAL; | |
3152 | if (src == inode) | |
3153 | same_inode = 1; | |
3154 | ||
3155 | /* the src must be open for reading */ | |
3156 | if (!(src_file.file->f_mode & FMODE_READ)) | |
3157 | goto out_fput; | |
3158 | ||
3159 | /* don't make the dst file partly checksummed */ | |
3160 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3161 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
3162 | goto out_fput; | |
3163 | ||
3164 | ret = -EISDIR; | |
3165 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
3166 | goto out_fput; | |
3167 | ||
3168 | ret = -EXDEV; | |
3169 | if (src->i_sb != inode->i_sb) | |
3170 | goto out_fput; | |
3171 | ||
3172 | if (!same_inode) { | |
3173 | if (inode < src) { | |
3174 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); | |
3175 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
3176 | } else { | |
3177 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); | |
3178 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
3179 | } | |
3180 | } else { | |
3181 | mutex_lock(&src->i_mutex); | |
3182 | } | |
3183 | ||
3184 | /* determine range to clone */ | |
3185 | ret = -EINVAL; | |
3186 | if (off + len > src->i_size || off + len < off) | |
3187 | goto out_unlock; | |
3188 | if (len == 0) | |
3189 | olen = len = src->i_size - off; | |
3190 | /* if we extend to eof, continue to block boundary */ | |
3191 | if (off + len == src->i_size) | |
3192 | len = ALIGN(src->i_size, bs) - off; | |
3193 | ||
3194 | /* verify the end result is block aligned */ | |
3195 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || | |
3196 | !IS_ALIGNED(destoff, bs)) | |
3197 | goto out_unlock; | |
3198 | ||
3199 | /* verify if ranges are overlapped within the same file */ | |
3200 | if (same_inode) { | |
3201 | if (destoff + len > off && destoff < off + len) | |
3202 | goto out_unlock; | |
3203 | } | |
3204 | ||
3205 | if (destoff > inode->i_size) { | |
3206 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
3207 | if (ret) | |
3208 | goto out_unlock; | |
3209 | } | |
3210 | ||
3211 | /* truncate page cache pages from target inode range */ | |
3212 | truncate_inode_pages_range(&inode->i_data, destoff, | |
3213 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
3214 | ||
3215 | lock_extent_range(src, off, len); | |
3216 | ||
3217 | ret = btrfs_clone(src, inode, off, olen, len, destoff); | |
3218 | ||
aa42ffd9 | 3219 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
f46b5a66 CH |
3220 | out_unlock: |
3221 | mutex_unlock(&src->i_mutex); | |
a96fbc72 LB |
3222 | if (!same_inode) |
3223 | mutex_unlock(&inode->i_mutex); | |
f46b5a66 | 3224 | out_fput: |
2903ff01 | 3225 | fdput(src_file); |
ab67b7c1 | 3226 | out_drop_write: |
2a79f17e | 3227 | mnt_drop_write_file(file); |
f46b5a66 CH |
3228 | return ret; |
3229 | } | |
3230 | ||
7a865e8a | 3231 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
3232 | { |
3233 | struct btrfs_ioctl_clone_range_args args; | |
3234 | ||
7a865e8a | 3235 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
3236 | return -EFAULT; |
3237 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
3238 | args.src_length, args.dest_offset); | |
3239 | } | |
3240 | ||
f46b5a66 CH |
3241 | /* |
3242 | * there are many ways the trans_start and trans_end ioctls can lead | |
3243 | * to deadlocks. They should only be used by applications that | |
3244 | * basically own the machine, and have a very in depth understanding | |
3245 | * of all the possible deadlocks and enospc problems. | |
3246 | */ | |
b2950863 | 3247 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 3248 | { |
496ad9aa | 3249 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3250 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3251 | struct btrfs_trans_handle *trans; | |
1ab86aed | 3252 | int ret; |
f46b5a66 | 3253 | |
1ab86aed | 3254 | ret = -EPERM; |
df5b5520 | 3255 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 3256 | goto out; |
df5b5520 | 3257 | |
1ab86aed SW |
3258 | ret = -EINPROGRESS; |
3259 | if (file->private_data) | |
f46b5a66 | 3260 | goto out; |
9ca9ee09 | 3261 | |
b83cc969 LZ |
3262 | ret = -EROFS; |
3263 | if (btrfs_root_readonly(root)) | |
3264 | goto out; | |
3265 | ||
a561be71 | 3266 | ret = mnt_want_write_file(file); |
c146afad YZ |
3267 | if (ret) |
3268 | goto out; | |
3269 | ||
a4abeea4 | 3270 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3271 | |
1ab86aed | 3272 | ret = -ENOMEM; |
7a7eaa40 | 3273 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 3274 | if (IS_ERR(trans)) |
1ab86aed SW |
3275 | goto out_drop; |
3276 | ||
3277 | file->private_data = trans; | |
3278 | return 0; | |
3279 | ||
3280 | out_drop: | |
a4abeea4 | 3281 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 3282 | mnt_drop_write_file(file); |
f46b5a66 | 3283 | out: |
f46b5a66 CH |
3284 | return ret; |
3285 | } | |
3286 | ||
6ef5ed0d JB |
3287 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
3288 | { | |
496ad9aa | 3289 | struct inode *inode = file_inode(file); |
6ef5ed0d JB |
3290 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3291 | struct btrfs_root *new_root; | |
3292 | struct btrfs_dir_item *di; | |
3293 | struct btrfs_trans_handle *trans; | |
3294 | struct btrfs_path *path; | |
3295 | struct btrfs_key location; | |
3296 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
3297 | u64 objectid = 0; |
3298 | u64 dir_id; | |
3c04ce01 | 3299 | int ret; |
6ef5ed0d JB |
3300 | |
3301 | if (!capable(CAP_SYS_ADMIN)) | |
3302 | return -EPERM; | |
3303 | ||
3c04ce01 MX |
3304 | ret = mnt_want_write_file(file); |
3305 | if (ret) | |
3306 | return ret; | |
3307 | ||
3308 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
3309 | ret = -EFAULT; | |
3310 | goto out; | |
3311 | } | |
6ef5ed0d JB |
3312 | |
3313 | if (!objectid) | |
1cecf579 | 3314 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d JB |
3315 | |
3316 | location.objectid = objectid; | |
3317 | location.type = BTRFS_ROOT_ITEM_KEY; | |
3318 | location.offset = (u64)-1; | |
3319 | ||
3320 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
3c04ce01 MX |
3321 | if (IS_ERR(new_root)) { |
3322 | ret = PTR_ERR(new_root); | |
3323 | goto out; | |
3324 | } | |
6ef5ed0d | 3325 | |
6ef5ed0d | 3326 | path = btrfs_alloc_path(); |
3c04ce01 MX |
3327 | if (!path) { |
3328 | ret = -ENOMEM; | |
3329 | goto out; | |
3330 | } | |
6ef5ed0d JB |
3331 | path->leave_spinning = 1; |
3332 | ||
3333 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 3334 | if (IS_ERR(trans)) { |
6ef5ed0d | 3335 | btrfs_free_path(path); |
3c04ce01 MX |
3336 | ret = PTR_ERR(trans); |
3337 | goto out; | |
6ef5ed0d JB |
3338 | } |
3339 | ||
6c41761f | 3340 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
3341 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
3342 | dir_id, "default", 7, 1); | |
cf1e99a4 | 3343 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
3344 | btrfs_free_path(path); |
3345 | btrfs_end_transaction(trans, root); | |
3346 | printk(KERN_ERR "Umm, you don't have the default dir item, " | |
3347 | "this isn't going to work\n"); | |
3c04ce01 MX |
3348 | ret = -ENOENT; |
3349 | goto out; | |
6ef5ed0d JB |
3350 | } |
3351 | ||
3352 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
3353 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
3354 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3355 | btrfs_free_path(path); | |
3356 | ||
2b0ce2c2 | 3357 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d | 3358 | btrfs_end_transaction(trans, root); |
3c04ce01 MX |
3359 | out: |
3360 | mnt_drop_write_file(file); | |
3361 | return ret; | |
6ef5ed0d JB |
3362 | } |
3363 | ||
5af3e8cc SB |
3364 | void btrfs_get_block_group_info(struct list_head *groups_list, |
3365 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
3366 | { |
3367 | struct btrfs_block_group_cache *block_group; | |
3368 | ||
3369 | space->total_bytes = 0; | |
3370 | space->used_bytes = 0; | |
3371 | space->flags = 0; | |
3372 | list_for_each_entry(block_group, groups_list, list) { | |
3373 | space->flags = block_group->flags; | |
3374 | space->total_bytes += block_group->key.offset; | |
3375 | space->used_bytes += | |
3376 | btrfs_block_group_used(&block_group->item); | |
3377 | } | |
3378 | } | |
3379 | ||
48a3b636 | 3380 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1406e432 JB |
3381 | { |
3382 | struct btrfs_ioctl_space_args space_args; | |
3383 | struct btrfs_ioctl_space_info space; | |
3384 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 3385 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 3386 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 3387 | struct btrfs_space_info *info; |
bf5fc093 JB |
3388 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
3389 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3390 | BTRFS_BLOCK_GROUP_METADATA, | |
3391 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
3392 | int num_types = 4; | |
7fde62bf | 3393 | int alloc_size; |
1406e432 | 3394 | int ret = 0; |
51788b1b | 3395 | u64 slot_count = 0; |
bf5fc093 | 3396 | int i, c; |
1406e432 JB |
3397 | |
3398 | if (copy_from_user(&space_args, | |
3399 | (struct btrfs_ioctl_space_args __user *)arg, | |
3400 | sizeof(space_args))) | |
3401 | return -EFAULT; | |
3402 | ||
bf5fc093 JB |
3403 | for (i = 0; i < num_types; i++) { |
3404 | struct btrfs_space_info *tmp; | |
3405 | ||
3406 | info = NULL; | |
3407 | rcu_read_lock(); | |
3408 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3409 | list) { | |
3410 | if (tmp->flags == types[i]) { | |
3411 | info = tmp; | |
3412 | break; | |
3413 | } | |
3414 | } | |
3415 | rcu_read_unlock(); | |
3416 | ||
3417 | if (!info) | |
3418 | continue; | |
3419 | ||
3420 | down_read(&info->groups_sem); | |
3421 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3422 | if (!list_empty(&info->block_groups[c])) | |
3423 | slot_count++; | |
3424 | } | |
3425 | up_read(&info->groups_sem); | |
3426 | } | |
7fde62bf CM |
3427 | |
3428 | /* space_slots == 0 means they are asking for a count */ | |
3429 | if (space_args.space_slots == 0) { | |
3430 | space_args.total_spaces = slot_count; | |
3431 | goto out; | |
3432 | } | |
bf5fc093 | 3433 | |
51788b1b | 3434 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3435 | |
7fde62bf | 3436 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3437 | |
7fde62bf CM |
3438 | /* we generally have at most 6 or so space infos, one for each raid |
3439 | * level. So, a whole page should be more than enough for everyone | |
3440 | */ | |
3441 | if (alloc_size > PAGE_CACHE_SIZE) | |
3442 | return -ENOMEM; | |
3443 | ||
1406e432 | 3444 | space_args.total_spaces = 0; |
7fde62bf CM |
3445 | dest = kmalloc(alloc_size, GFP_NOFS); |
3446 | if (!dest) | |
3447 | return -ENOMEM; | |
3448 | dest_orig = dest; | |
1406e432 | 3449 | |
7fde62bf | 3450 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3451 | for (i = 0; i < num_types; i++) { |
3452 | struct btrfs_space_info *tmp; | |
3453 | ||
51788b1b DR |
3454 | if (!slot_count) |
3455 | break; | |
3456 | ||
bf5fc093 JB |
3457 | info = NULL; |
3458 | rcu_read_lock(); | |
3459 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3460 | list) { | |
3461 | if (tmp->flags == types[i]) { | |
3462 | info = tmp; | |
3463 | break; | |
3464 | } | |
3465 | } | |
3466 | rcu_read_unlock(); | |
7fde62bf | 3467 | |
bf5fc093 JB |
3468 | if (!info) |
3469 | continue; | |
3470 | down_read(&info->groups_sem); | |
3471 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3472 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
3473 | btrfs_get_block_group_info( |
3474 | &info->block_groups[c], &space); | |
bf5fc093 JB |
3475 | memcpy(dest, &space, sizeof(space)); |
3476 | dest++; | |
3477 | space_args.total_spaces++; | |
51788b1b | 3478 | slot_count--; |
bf5fc093 | 3479 | } |
51788b1b DR |
3480 | if (!slot_count) |
3481 | break; | |
bf5fc093 JB |
3482 | } |
3483 | up_read(&info->groups_sem); | |
1406e432 | 3484 | } |
1406e432 | 3485 | |
2eec6c81 | 3486 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3487 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3488 | ||
3489 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3490 | ret = -EFAULT; | |
3491 | ||
3492 | kfree(dest_orig); | |
3493 | out: | |
3494 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3495 | ret = -EFAULT; |
3496 | ||
3497 | return ret; | |
3498 | } | |
3499 | ||
f46b5a66 CH |
3500 | /* |
3501 | * there are many ways the trans_start and trans_end ioctls can lead | |
3502 | * to deadlocks. They should only be used by applications that | |
3503 | * basically own the machine, and have a very in depth understanding | |
3504 | * of all the possible deadlocks and enospc problems. | |
3505 | */ | |
3506 | long btrfs_ioctl_trans_end(struct file *file) | |
3507 | { | |
496ad9aa | 3508 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3509 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3510 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 3511 | |
f46b5a66 | 3512 | trans = file->private_data; |
1ab86aed SW |
3513 | if (!trans) |
3514 | return -EINVAL; | |
b214107e | 3515 | file->private_data = NULL; |
9ca9ee09 | 3516 | |
1ab86aed SW |
3517 | btrfs_end_transaction(trans, root); |
3518 | ||
a4abeea4 | 3519 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3520 | |
2a79f17e | 3521 | mnt_drop_write_file(file); |
1ab86aed | 3522 | return 0; |
f46b5a66 CH |
3523 | } |
3524 | ||
9a8c28be MX |
3525 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3526 | void __user *argp) | |
46204592 | 3527 | { |
46204592 SW |
3528 | struct btrfs_trans_handle *trans; |
3529 | u64 transid; | |
db5b493a | 3530 | int ret; |
46204592 | 3531 | |
d4edf39b | 3532 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
3533 | if (IS_ERR(trans)) { |
3534 | if (PTR_ERR(trans) != -ENOENT) | |
3535 | return PTR_ERR(trans); | |
3536 | ||
3537 | /* No running transaction, don't bother */ | |
3538 | transid = root->fs_info->last_trans_committed; | |
3539 | goto out; | |
3540 | } | |
46204592 | 3541 | transid = trans->transid; |
db5b493a | 3542 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
3543 | if (ret) { |
3544 | btrfs_end_transaction(trans, root); | |
db5b493a | 3545 | return ret; |
8b2b2d3c | 3546 | } |
ff7c1d33 | 3547 | out: |
46204592 SW |
3548 | if (argp) |
3549 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3550 | return -EFAULT; | |
3551 | return 0; | |
3552 | } | |
3553 | ||
9a8c28be MX |
3554 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
3555 | void __user *argp) | |
46204592 | 3556 | { |
46204592 SW |
3557 | u64 transid; |
3558 | ||
3559 | if (argp) { | |
3560 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3561 | return -EFAULT; | |
3562 | } else { | |
3563 | transid = 0; /* current trans */ | |
3564 | } | |
3565 | return btrfs_wait_for_commit(root, transid); | |
3566 | } | |
3567 | ||
b8e95489 | 3568 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 3569 | { |
496ad9aa | 3570 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
475f6387 | 3571 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 3572 | int ret; |
475f6387 JS |
3573 | |
3574 | if (!capable(CAP_SYS_ADMIN)) | |
3575 | return -EPERM; | |
3576 | ||
3577 | sa = memdup_user(arg, sizeof(*sa)); | |
3578 | if (IS_ERR(sa)) | |
3579 | return PTR_ERR(sa); | |
3580 | ||
b8e95489 MX |
3581 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
3582 | ret = mnt_want_write_file(file); | |
3583 | if (ret) | |
3584 | goto out; | |
3585 | } | |
3586 | ||
aa1b8cd4 | 3587 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3588 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3589 | 0); | |
475f6387 JS |
3590 | |
3591 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3592 | ret = -EFAULT; | |
3593 | ||
b8e95489 MX |
3594 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
3595 | mnt_drop_write_file(file); | |
3596 | out: | |
475f6387 JS |
3597 | kfree(sa); |
3598 | return ret; | |
3599 | } | |
3600 | ||
3601 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
3602 | { | |
3603 | if (!capable(CAP_SYS_ADMIN)) | |
3604 | return -EPERM; | |
3605 | ||
aa1b8cd4 | 3606 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
3607 | } |
3608 | ||
3609 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
3610 | void __user *arg) | |
3611 | { | |
3612 | struct btrfs_ioctl_scrub_args *sa; | |
3613 | int ret; | |
3614 | ||
3615 | if (!capable(CAP_SYS_ADMIN)) | |
3616 | return -EPERM; | |
3617 | ||
3618 | sa = memdup_user(arg, sizeof(*sa)); | |
3619 | if (IS_ERR(sa)) | |
3620 | return PTR_ERR(sa); | |
3621 | ||
3622 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
3623 | ||
3624 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3625 | ret = -EFAULT; | |
3626 | ||
3627 | kfree(sa); | |
3628 | return ret; | |
3629 | } | |
3630 | ||
c11d2c23 | 3631 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 3632 | void __user *arg) |
c11d2c23 SB |
3633 | { |
3634 | struct btrfs_ioctl_get_dev_stats *sa; | |
3635 | int ret; | |
3636 | ||
c11d2c23 SB |
3637 | sa = memdup_user(arg, sizeof(*sa)); |
3638 | if (IS_ERR(sa)) | |
3639 | return PTR_ERR(sa); | |
3640 | ||
b27f7c0c DS |
3641 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3642 | kfree(sa); | |
3643 | return -EPERM; | |
3644 | } | |
3645 | ||
3646 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
3647 | |
3648 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3649 | ret = -EFAULT; | |
3650 | ||
3651 | kfree(sa); | |
3652 | return ret; | |
3653 | } | |
3654 | ||
3f6bcfbd SB |
3655 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
3656 | { | |
3657 | struct btrfs_ioctl_dev_replace_args *p; | |
3658 | int ret; | |
3659 | ||
3660 | if (!capable(CAP_SYS_ADMIN)) | |
3661 | return -EPERM; | |
3662 | ||
3663 | p = memdup_user(arg, sizeof(*p)); | |
3664 | if (IS_ERR(p)) | |
3665 | return PTR_ERR(p); | |
3666 | ||
3667 | switch (p->cmd) { | |
3668 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
adfa97cb ID |
3669 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
3670 | ret = -EROFS; | |
3671 | goto out; | |
3672 | } | |
3f6bcfbd SB |
3673 | if (atomic_xchg( |
3674 | &root->fs_info->mutually_exclusive_operation_running, | |
3675 | 1)) { | |
e57138b3 | 3676 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd SB |
3677 | } else { |
3678 | ret = btrfs_dev_replace_start(root, p); | |
3679 | atomic_set( | |
3680 | &root->fs_info->mutually_exclusive_operation_running, | |
3681 | 0); | |
3682 | } | |
3683 | break; | |
3684 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
3685 | btrfs_dev_replace_status(root->fs_info, p); | |
3686 | ret = 0; | |
3687 | break; | |
3688 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
3689 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
3690 | break; | |
3691 | default: | |
3692 | ret = -EINVAL; | |
3693 | break; | |
3694 | } | |
3695 | ||
3696 | if (copy_to_user(arg, p, sizeof(*p))) | |
3697 | ret = -EFAULT; | |
adfa97cb | 3698 | out: |
3f6bcfbd SB |
3699 | kfree(p); |
3700 | return ret; | |
3701 | } | |
3702 | ||
d7728c96 JS |
3703 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3704 | { | |
3705 | int ret = 0; | |
3706 | int i; | |
740c3d22 | 3707 | u64 rel_ptr; |
d7728c96 | 3708 | int size; |
806468f8 | 3709 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3710 | struct inode_fs_paths *ipath = NULL; |
3711 | struct btrfs_path *path; | |
3712 | ||
82b22ac8 | 3713 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
3714 | return -EPERM; |
3715 | ||
3716 | path = btrfs_alloc_path(); | |
3717 | if (!path) { | |
3718 | ret = -ENOMEM; | |
3719 | goto out; | |
3720 | } | |
3721 | ||
3722 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3723 | if (IS_ERR(ipa)) { | |
3724 | ret = PTR_ERR(ipa); | |
3725 | ipa = NULL; | |
3726 | goto out; | |
3727 | } | |
3728 | ||
3729 | size = min_t(u32, ipa->size, 4096); | |
3730 | ipath = init_ipath(size, root, path); | |
3731 | if (IS_ERR(ipath)) { | |
3732 | ret = PTR_ERR(ipath); | |
3733 | ipath = NULL; | |
3734 | goto out; | |
3735 | } | |
3736 | ||
3737 | ret = paths_from_inode(ipa->inum, ipath); | |
3738 | if (ret < 0) | |
3739 | goto out; | |
3740 | ||
3741 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3742 | rel_ptr = ipath->fspath->val[i] - |
3743 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3744 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3745 | } |
3746 | ||
745c4d8e JM |
3747 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
3748 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
3749 | if (ret) { |
3750 | ret = -EFAULT; | |
3751 | goto out; | |
3752 | } | |
3753 | ||
3754 | out: | |
3755 | btrfs_free_path(path); | |
3756 | free_ipath(ipath); | |
3757 | kfree(ipa); | |
3758 | ||
3759 | return ret; | |
3760 | } | |
3761 | ||
3762 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
3763 | { | |
3764 | struct btrfs_data_container *inodes = ctx; | |
3765 | const size_t c = 3 * sizeof(u64); | |
3766 | ||
3767 | if (inodes->bytes_left >= c) { | |
3768 | inodes->bytes_left -= c; | |
3769 | inodes->val[inodes->elem_cnt] = inum; | |
3770 | inodes->val[inodes->elem_cnt + 1] = offset; | |
3771 | inodes->val[inodes->elem_cnt + 2] = root; | |
3772 | inodes->elem_cnt += 3; | |
3773 | } else { | |
3774 | inodes->bytes_missing += c - inodes->bytes_left; | |
3775 | inodes->bytes_left = 0; | |
3776 | inodes->elem_missed += 3; | |
3777 | } | |
3778 | ||
3779 | return 0; | |
3780 | } | |
3781 | ||
3782 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
3783 | void __user *arg) | |
3784 | { | |
3785 | int ret = 0; | |
3786 | int size; | |
d7728c96 JS |
3787 | struct btrfs_ioctl_logical_ino_args *loi; |
3788 | struct btrfs_data_container *inodes = NULL; | |
3789 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
3790 | |
3791 | if (!capable(CAP_SYS_ADMIN)) | |
3792 | return -EPERM; | |
3793 | ||
3794 | loi = memdup_user(arg, sizeof(*loi)); | |
3795 | if (IS_ERR(loi)) { | |
3796 | ret = PTR_ERR(loi); | |
3797 | loi = NULL; | |
3798 | goto out; | |
3799 | } | |
3800 | ||
3801 | path = btrfs_alloc_path(); | |
3802 | if (!path) { | |
3803 | ret = -ENOMEM; | |
3804 | goto out; | |
3805 | } | |
3806 | ||
425d17a2 | 3807 | size = min_t(u32, loi->size, 64 * 1024); |
d7728c96 JS |
3808 | inodes = init_data_container(size); |
3809 | if (IS_ERR(inodes)) { | |
3810 | ret = PTR_ERR(inodes); | |
3811 | inodes = NULL; | |
3812 | goto out; | |
3813 | } | |
3814 | ||
df031f07 LB |
3815 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
3816 | build_ino_list, inodes); | |
3817 | if (ret == -EINVAL) | |
d7728c96 JS |
3818 | ret = -ENOENT; |
3819 | if (ret < 0) | |
3820 | goto out; | |
3821 | ||
745c4d8e JM |
3822 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
3823 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
3824 | if (ret) |
3825 | ret = -EFAULT; | |
3826 | ||
3827 | out: | |
3828 | btrfs_free_path(path); | |
425d17a2 | 3829 | vfree(inodes); |
d7728c96 JS |
3830 | kfree(loi); |
3831 | ||
3832 | return ret; | |
3833 | } | |
3834 | ||
19a39dce | 3835 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
3836 | struct btrfs_ioctl_balance_args *bargs) |
3837 | { | |
3838 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3839 | ||
3840 | bargs->flags = bctl->flags; | |
3841 | ||
837d5b6e ID |
3842 | if (atomic_read(&fs_info->balance_running)) |
3843 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
3844 | if (atomic_read(&fs_info->balance_pause_req)) | |
3845 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3846 | if (atomic_read(&fs_info->balance_cancel_req)) |
3847 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3848 | |
c9e9f97b ID |
3849 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3850 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3851 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
3852 | |
3853 | if (lock) { | |
3854 | spin_lock(&fs_info->balance_lock); | |
3855 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3856 | spin_unlock(&fs_info->balance_lock); | |
3857 | } else { | |
3858 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3859 | } | |
c9e9f97b ID |
3860 | } |
3861 | ||
9ba1f6e4 | 3862 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3863 | { |
496ad9aa | 3864 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
3865 | struct btrfs_fs_info *fs_info = root->fs_info; |
3866 | struct btrfs_ioctl_balance_args *bargs; | |
3867 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 3868 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
3869 | int ret; |
3870 | ||
3871 | if (!capable(CAP_SYS_ADMIN)) | |
3872 | return -EPERM; | |
3873 | ||
e54bfa31 | 3874 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3875 | if (ret) |
3876 | return ret; | |
3877 | ||
ed0fb78f ID |
3878 | again: |
3879 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { | |
3880 | mutex_lock(&fs_info->volume_mutex); | |
3881 | mutex_lock(&fs_info->balance_mutex); | |
3882 | need_unlock = true; | |
3883 | goto locked; | |
3884 | } | |
3885 | ||
3886 | /* | |
3887 | * mut. excl. ops lock is locked. Three possibilites: | |
3888 | * (1) some other op is running | |
3889 | * (2) balance is running | |
3890 | * (3) balance is paused -- special case (think resume) | |
3891 | */ | |
c9e9f97b | 3892 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
3893 | if (fs_info->balance_ctl) { |
3894 | /* this is either (2) or (3) */ | |
3895 | if (!atomic_read(&fs_info->balance_running)) { | |
3896 | mutex_unlock(&fs_info->balance_mutex); | |
3897 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
3898 | goto again; | |
3899 | mutex_lock(&fs_info->balance_mutex); | |
3900 | ||
3901 | if (fs_info->balance_ctl && | |
3902 | !atomic_read(&fs_info->balance_running)) { | |
3903 | /* this is (3) */ | |
3904 | need_unlock = false; | |
3905 | goto locked; | |
3906 | } | |
3907 | ||
3908 | mutex_unlock(&fs_info->balance_mutex); | |
3909 | mutex_unlock(&fs_info->volume_mutex); | |
3910 | goto again; | |
3911 | } else { | |
3912 | /* this is (2) */ | |
3913 | mutex_unlock(&fs_info->balance_mutex); | |
3914 | ret = -EINPROGRESS; | |
3915 | goto out; | |
3916 | } | |
3917 | } else { | |
3918 | /* this is (1) */ | |
3919 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 3920 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
3921 | goto out; |
3922 | } | |
3923 | ||
3924 | locked: | |
3925 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); | |
c9e9f97b ID |
3926 | |
3927 | if (arg) { | |
3928 | bargs = memdup_user(arg, sizeof(*bargs)); | |
3929 | if (IS_ERR(bargs)) { | |
3930 | ret = PTR_ERR(bargs); | |
ed0fb78f | 3931 | goto out_unlock; |
c9e9f97b | 3932 | } |
de322263 ID |
3933 | |
3934 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
3935 | if (!fs_info->balance_ctl) { | |
3936 | ret = -ENOTCONN; | |
3937 | goto out_bargs; | |
3938 | } | |
3939 | ||
3940 | bctl = fs_info->balance_ctl; | |
3941 | spin_lock(&fs_info->balance_lock); | |
3942 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
3943 | spin_unlock(&fs_info->balance_lock); | |
3944 | ||
3945 | goto do_balance; | |
3946 | } | |
c9e9f97b ID |
3947 | } else { |
3948 | bargs = NULL; | |
3949 | } | |
3950 | ||
ed0fb78f | 3951 | if (fs_info->balance_ctl) { |
837d5b6e ID |
3952 | ret = -EINPROGRESS; |
3953 | goto out_bargs; | |
3954 | } | |
3955 | ||
c9e9f97b ID |
3956 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
3957 | if (!bctl) { | |
3958 | ret = -ENOMEM; | |
3959 | goto out_bargs; | |
3960 | } | |
3961 | ||
3962 | bctl->fs_info = fs_info; | |
3963 | if (arg) { | |
3964 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
3965 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
3966 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
3967 | ||
3968 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
3969 | } else { |
3970 | /* balance everything - no filters */ | |
3971 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
3972 | } |
3973 | ||
de322263 | 3974 | do_balance: |
c9e9f97b | 3975 | /* |
ed0fb78f ID |
3976 | * Ownership of bctl and mutually_exclusive_operation_running |
3977 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, | |
3978 | * or, if restriper was paused all the way until unmount, in | |
3979 | * free_fs_info. mutually_exclusive_operation_running is | |
3980 | * cleared in __cancel_balance. | |
c9e9f97b | 3981 | */ |
ed0fb78f ID |
3982 | need_unlock = false; |
3983 | ||
3984 | ret = btrfs_balance(bctl, bargs); | |
3985 | ||
c9e9f97b ID |
3986 | if (arg) { |
3987 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
3988 | ret = -EFAULT; | |
3989 | } | |
3990 | ||
3991 | out_bargs: | |
3992 | kfree(bargs); | |
ed0fb78f | 3993 | out_unlock: |
c9e9f97b ID |
3994 | mutex_unlock(&fs_info->balance_mutex); |
3995 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f ID |
3996 | if (need_unlock) |
3997 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
3998 | out: | |
e54bfa31 | 3999 | mnt_drop_write_file(file); |
c9e9f97b ID |
4000 | return ret; |
4001 | } | |
4002 | ||
837d5b6e ID |
4003 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
4004 | { | |
4005 | if (!capable(CAP_SYS_ADMIN)) | |
4006 | return -EPERM; | |
4007 | ||
4008 | switch (cmd) { | |
4009 | case BTRFS_BALANCE_CTL_PAUSE: | |
4010 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
4011 | case BTRFS_BALANCE_CTL_CANCEL: |
4012 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
4013 | } |
4014 | ||
4015 | return -EINVAL; | |
4016 | } | |
4017 | ||
19a39dce ID |
4018 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
4019 | void __user *arg) | |
4020 | { | |
4021 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4022 | struct btrfs_ioctl_balance_args *bargs; | |
4023 | int ret = 0; | |
4024 | ||
4025 | if (!capable(CAP_SYS_ADMIN)) | |
4026 | return -EPERM; | |
4027 | ||
4028 | mutex_lock(&fs_info->balance_mutex); | |
4029 | if (!fs_info->balance_ctl) { | |
4030 | ret = -ENOTCONN; | |
4031 | goto out; | |
4032 | } | |
4033 | ||
4034 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); | |
4035 | if (!bargs) { | |
4036 | ret = -ENOMEM; | |
4037 | goto out; | |
4038 | } | |
4039 | ||
4040 | update_ioctl_balance_args(fs_info, 1, bargs); | |
4041 | ||
4042 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4043 | ret = -EFAULT; | |
4044 | ||
4045 | kfree(bargs); | |
4046 | out: | |
4047 | mutex_unlock(&fs_info->balance_mutex); | |
4048 | return ret; | |
4049 | } | |
4050 | ||
905b0dda | 4051 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4052 | { |
496ad9aa | 4053 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4054 | struct btrfs_ioctl_quota_ctl_args *sa; |
4055 | struct btrfs_trans_handle *trans = NULL; | |
4056 | int ret; | |
4057 | int err; | |
4058 | ||
4059 | if (!capable(CAP_SYS_ADMIN)) | |
4060 | return -EPERM; | |
4061 | ||
905b0dda MX |
4062 | ret = mnt_want_write_file(file); |
4063 | if (ret) | |
4064 | return ret; | |
5d13a37b AJ |
4065 | |
4066 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4067 | if (IS_ERR(sa)) { |
4068 | ret = PTR_ERR(sa); | |
4069 | goto drop_write; | |
4070 | } | |
5d13a37b | 4071 | |
7708f029 | 4072 | down_write(&root->fs_info->subvol_sem); |
2f232036 JS |
4073 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
4074 | if (IS_ERR(trans)) { | |
4075 | ret = PTR_ERR(trans); | |
4076 | goto out; | |
5d13a37b AJ |
4077 | } |
4078 | ||
4079 | switch (sa->cmd) { | |
4080 | case BTRFS_QUOTA_CTL_ENABLE: | |
4081 | ret = btrfs_quota_enable(trans, root->fs_info); | |
4082 | break; | |
4083 | case BTRFS_QUOTA_CTL_DISABLE: | |
4084 | ret = btrfs_quota_disable(trans, root->fs_info); | |
4085 | break; | |
5d13a37b AJ |
4086 | default: |
4087 | ret = -EINVAL; | |
4088 | break; | |
4089 | } | |
4090 | ||
2f232036 JS |
4091 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
4092 | if (err && !ret) | |
4093 | ret = err; | |
5d13a37b AJ |
4094 | out: |
4095 | kfree(sa); | |
7708f029 | 4096 | up_write(&root->fs_info->subvol_sem); |
905b0dda MX |
4097 | drop_write: |
4098 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4099 | return ret; |
4100 | } | |
4101 | ||
905b0dda | 4102 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4103 | { |
496ad9aa | 4104 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4105 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4106 | struct btrfs_trans_handle *trans; | |
4107 | int ret; | |
4108 | int err; | |
4109 | ||
4110 | if (!capable(CAP_SYS_ADMIN)) | |
4111 | return -EPERM; | |
4112 | ||
905b0dda MX |
4113 | ret = mnt_want_write_file(file); |
4114 | if (ret) | |
4115 | return ret; | |
5d13a37b AJ |
4116 | |
4117 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4118 | if (IS_ERR(sa)) { |
4119 | ret = PTR_ERR(sa); | |
4120 | goto drop_write; | |
4121 | } | |
5d13a37b AJ |
4122 | |
4123 | trans = btrfs_join_transaction(root); | |
4124 | if (IS_ERR(trans)) { | |
4125 | ret = PTR_ERR(trans); | |
4126 | goto out; | |
4127 | } | |
4128 | ||
4129 | /* FIXME: check if the IDs really exist */ | |
4130 | if (sa->assign) { | |
4131 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
4132 | sa->src, sa->dst); | |
4133 | } else { | |
4134 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
4135 | sa->src, sa->dst); | |
4136 | } | |
4137 | ||
4138 | err = btrfs_end_transaction(trans, root); | |
4139 | if (err && !ret) | |
4140 | ret = err; | |
4141 | ||
4142 | out: | |
4143 | kfree(sa); | |
905b0dda MX |
4144 | drop_write: |
4145 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4146 | return ret; |
4147 | } | |
4148 | ||
905b0dda | 4149 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4150 | { |
496ad9aa | 4151 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4152 | struct btrfs_ioctl_qgroup_create_args *sa; |
4153 | struct btrfs_trans_handle *trans; | |
4154 | int ret; | |
4155 | int err; | |
4156 | ||
4157 | if (!capable(CAP_SYS_ADMIN)) | |
4158 | return -EPERM; | |
4159 | ||
905b0dda MX |
4160 | ret = mnt_want_write_file(file); |
4161 | if (ret) | |
4162 | return ret; | |
5d13a37b AJ |
4163 | |
4164 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4165 | if (IS_ERR(sa)) { |
4166 | ret = PTR_ERR(sa); | |
4167 | goto drop_write; | |
4168 | } | |
5d13a37b | 4169 | |
d86e56cf MX |
4170 | if (!sa->qgroupid) { |
4171 | ret = -EINVAL; | |
4172 | goto out; | |
4173 | } | |
4174 | ||
5d13a37b AJ |
4175 | trans = btrfs_join_transaction(root); |
4176 | if (IS_ERR(trans)) { | |
4177 | ret = PTR_ERR(trans); | |
4178 | goto out; | |
4179 | } | |
4180 | ||
4181 | /* FIXME: check if the IDs really exist */ | |
4182 | if (sa->create) { | |
4183 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, | |
4184 | NULL); | |
4185 | } else { | |
4186 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
4187 | } | |
4188 | ||
4189 | err = btrfs_end_transaction(trans, root); | |
4190 | if (err && !ret) | |
4191 | ret = err; | |
4192 | ||
4193 | out: | |
4194 | kfree(sa); | |
905b0dda MX |
4195 | drop_write: |
4196 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4197 | return ret; |
4198 | } | |
4199 | ||
905b0dda | 4200 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4201 | { |
496ad9aa | 4202 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4203 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4204 | struct btrfs_trans_handle *trans; | |
4205 | int ret; | |
4206 | int err; | |
4207 | u64 qgroupid; | |
4208 | ||
4209 | if (!capable(CAP_SYS_ADMIN)) | |
4210 | return -EPERM; | |
4211 | ||
905b0dda MX |
4212 | ret = mnt_want_write_file(file); |
4213 | if (ret) | |
4214 | return ret; | |
5d13a37b AJ |
4215 | |
4216 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4217 | if (IS_ERR(sa)) { |
4218 | ret = PTR_ERR(sa); | |
4219 | goto drop_write; | |
4220 | } | |
5d13a37b AJ |
4221 | |
4222 | trans = btrfs_join_transaction(root); | |
4223 | if (IS_ERR(trans)) { | |
4224 | ret = PTR_ERR(trans); | |
4225 | goto out; | |
4226 | } | |
4227 | ||
4228 | qgroupid = sa->qgroupid; | |
4229 | if (!qgroupid) { | |
4230 | /* take the current subvol as qgroup */ | |
4231 | qgroupid = root->root_key.objectid; | |
4232 | } | |
4233 | ||
4234 | /* FIXME: check if the IDs really exist */ | |
4235 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
4236 | ||
4237 | err = btrfs_end_transaction(trans, root); | |
4238 | if (err && !ret) | |
4239 | ret = err; | |
4240 | ||
4241 | out: | |
4242 | kfree(sa); | |
905b0dda MX |
4243 | drop_write: |
4244 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4245 | return ret; |
4246 | } | |
4247 | ||
2f232036 JS |
4248 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
4249 | { | |
6d0379ec | 4250 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4251 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4252 | int ret; | |
4253 | ||
4254 | if (!capable(CAP_SYS_ADMIN)) | |
4255 | return -EPERM; | |
4256 | ||
4257 | ret = mnt_want_write_file(file); | |
4258 | if (ret) | |
4259 | return ret; | |
4260 | ||
4261 | qsa = memdup_user(arg, sizeof(*qsa)); | |
4262 | if (IS_ERR(qsa)) { | |
4263 | ret = PTR_ERR(qsa); | |
4264 | goto drop_write; | |
4265 | } | |
4266 | ||
4267 | if (qsa->flags) { | |
4268 | ret = -EINVAL; | |
4269 | goto out; | |
4270 | } | |
4271 | ||
4272 | ret = btrfs_qgroup_rescan(root->fs_info); | |
4273 | ||
4274 | out: | |
4275 | kfree(qsa); | |
4276 | drop_write: | |
4277 | mnt_drop_write_file(file); | |
4278 | return ret; | |
4279 | } | |
4280 | ||
4281 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
4282 | { | |
6d0379ec | 4283 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4284 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4285 | int ret = 0; | |
4286 | ||
4287 | if (!capable(CAP_SYS_ADMIN)) | |
4288 | return -EPERM; | |
4289 | ||
4290 | qsa = kzalloc(sizeof(*qsa), GFP_NOFS); | |
4291 | if (!qsa) | |
4292 | return -ENOMEM; | |
4293 | ||
4294 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
4295 | qsa->flags = 1; | |
4296 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; | |
4297 | } | |
4298 | ||
4299 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
4300 | ret = -EFAULT; | |
4301 | ||
4302 | kfree(qsa); | |
4303 | return ret; | |
4304 | } | |
4305 | ||
57254b6e JS |
4306 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
4307 | { | |
54563d41 | 4308 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
57254b6e JS |
4309 | |
4310 | if (!capable(CAP_SYS_ADMIN)) | |
4311 | return -EPERM; | |
4312 | ||
4313 | return btrfs_qgroup_wait_for_completion(root->fs_info); | |
4314 | } | |
4315 | ||
8ea05e3a AB |
4316 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
4317 | void __user *arg) | |
4318 | { | |
4319 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
496ad9aa | 4320 | struct inode *inode = file_inode(file); |
8ea05e3a AB |
4321 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4322 | struct btrfs_root_item *root_item = &root->root_item; | |
4323 | struct btrfs_trans_handle *trans; | |
4324 | struct timespec ct = CURRENT_TIME; | |
4325 | int ret = 0; | |
dd5f9615 | 4326 | int received_uuid_changed; |
8ea05e3a AB |
4327 | |
4328 | ret = mnt_want_write_file(file); | |
4329 | if (ret < 0) | |
4330 | return ret; | |
4331 | ||
4332 | down_write(&root->fs_info->subvol_sem); | |
4333 | ||
4334 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
4335 | ret = -EINVAL; | |
4336 | goto out; | |
4337 | } | |
4338 | ||
4339 | if (btrfs_root_readonly(root)) { | |
4340 | ret = -EROFS; | |
4341 | goto out; | |
4342 | } | |
4343 | ||
4344 | if (!inode_owner_or_capable(inode)) { | |
4345 | ret = -EACCES; | |
4346 | goto out; | |
4347 | } | |
4348 | ||
4349 | sa = memdup_user(arg, sizeof(*sa)); | |
4350 | if (IS_ERR(sa)) { | |
4351 | ret = PTR_ERR(sa); | |
4352 | sa = NULL; | |
4353 | goto out; | |
4354 | } | |
4355 | ||
dd5f9615 SB |
4356 | /* |
4357 | * 1 - root item | |
4358 | * 2 - uuid items (received uuid + subvol uuid) | |
4359 | */ | |
4360 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
4361 | if (IS_ERR(trans)) { |
4362 | ret = PTR_ERR(trans); | |
4363 | trans = NULL; | |
4364 | goto out; | |
4365 | } | |
4366 | ||
4367 | sa->rtransid = trans->transid; | |
4368 | sa->rtime.sec = ct.tv_sec; | |
4369 | sa->rtime.nsec = ct.tv_nsec; | |
4370 | ||
dd5f9615 SB |
4371 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
4372 | BTRFS_UUID_SIZE); | |
4373 | if (received_uuid_changed && | |
4374 | !btrfs_is_empty_uuid(root_item->received_uuid)) | |
4375 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
4376 | root_item->received_uuid, | |
4377 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4378 | root->root_key.objectid); | |
8ea05e3a AB |
4379 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
4380 | btrfs_set_root_stransid(root_item, sa->stransid); | |
4381 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
4382 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
4383 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
4384 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
4385 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a AB |
4386 | |
4387 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4388 | &root->root_key, &root->root_item); | |
4389 | if (ret < 0) { | |
4390 | btrfs_end_transaction(trans, root); | |
8ea05e3a | 4391 | goto out; |
dd5f9615 SB |
4392 | } |
4393 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
4394 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, | |
4395 | sa->uuid, | |
4396 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4397 | root->root_key.objectid); | |
4398 | if (ret < 0 && ret != -EEXIST) { | |
4399 | btrfs_abort_transaction(trans, root, ret); | |
8ea05e3a | 4400 | goto out; |
dd5f9615 SB |
4401 | } |
4402 | } | |
4403 | ret = btrfs_commit_transaction(trans, root); | |
4404 | if (ret < 0) { | |
4405 | btrfs_abort_transaction(trans, root, ret); | |
4406 | goto out; | |
8ea05e3a AB |
4407 | } |
4408 | ||
4409 | ret = copy_to_user(arg, sa, sizeof(*sa)); | |
4410 | if (ret) | |
4411 | ret = -EFAULT; | |
4412 | ||
4413 | out: | |
4414 | kfree(sa); | |
4415 | up_write(&root->fs_info->subvol_sem); | |
4416 | mnt_drop_write_file(file); | |
4417 | return ret; | |
4418 | } | |
4419 | ||
867ab667 | 4420 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
4421 | { | |
6d0379ec | 4422 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a1b83ac5 | 4423 | size_t len; |
867ab667 | 4424 | int ret; |
a1b83ac5 AJ |
4425 | char label[BTRFS_LABEL_SIZE]; |
4426 | ||
4427 | spin_lock(&root->fs_info->super_lock); | |
4428 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
4429 | spin_unlock(&root->fs_info->super_lock); | |
4430 | ||
4431 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 4432 | |
4433 | if (len == BTRFS_LABEL_SIZE) { | |
4434 | pr_warn("btrfs: label is too long, return the first %zu bytes\n", | |
4435 | --len); | |
4436 | } | |
4437 | ||
867ab667 | 4438 | ret = copy_to_user(arg, label, len); |
867ab667 | 4439 | |
4440 | return ret ? -EFAULT : 0; | |
4441 | } | |
4442 | ||
a8bfd4ab | 4443 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
4444 | { | |
6d0379ec | 4445 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a8bfd4ab | 4446 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
4447 | struct btrfs_trans_handle *trans; | |
4448 | char label[BTRFS_LABEL_SIZE]; | |
4449 | int ret; | |
4450 | ||
4451 | if (!capable(CAP_SYS_ADMIN)) | |
4452 | return -EPERM; | |
4453 | ||
4454 | if (copy_from_user(label, arg, sizeof(label))) | |
4455 | return -EFAULT; | |
4456 | ||
4457 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
4458 | pr_err("btrfs: unable to set label with more than %d bytes\n", | |
4459 | BTRFS_LABEL_SIZE - 1); | |
4460 | return -EINVAL; | |
4461 | } | |
4462 | ||
4463 | ret = mnt_want_write_file(file); | |
4464 | if (ret) | |
4465 | return ret; | |
4466 | ||
a8bfd4ab | 4467 | trans = btrfs_start_transaction(root, 0); |
4468 | if (IS_ERR(trans)) { | |
4469 | ret = PTR_ERR(trans); | |
4470 | goto out_unlock; | |
4471 | } | |
4472 | ||
a1b83ac5 | 4473 | spin_lock(&root->fs_info->super_lock); |
a8bfd4ab | 4474 | strcpy(super_block->label, label); |
a1b83ac5 | 4475 | spin_unlock(&root->fs_info->super_lock); |
a8bfd4ab | 4476 | ret = btrfs_end_transaction(trans, root); |
4477 | ||
4478 | out_unlock: | |
a8bfd4ab | 4479 | mnt_drop_write_file(file); |
4480 | return ret; | |
4481 | } | |
4482 | ||
f46b5a66 CH |
4483 | long btrfs_ioctl(struct file *file, unsigned int |
4484 | cmd, unsigned long arg) | |
4485 | { | |
496ad9aa | 4486 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
4bcabaa3 | 4487 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
4488 | |
4489 | switch (cmd) { | |
6cbff00f CH |
4490 | case FS_IOC_GETFLAGS: |
4491 | return btrfs_ioctl_getflags(file, argp); | |
4492 | case FS_IOC_SETFLAGS: | |
4493 | return btrfs_ioctl_setflags(file, argp); | |
4494 | case FS_IOC_GETVERSION: | |
4495 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
4496 | case FITRIM: |
4497 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 4498 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 4499 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 4500 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 4501 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 4502 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 4503 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
4504 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
4505 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
4506 | case BTRFS_IOC_SNAP_DESTROY: |
4507 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
4508 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
4509 | return btrfs_ioctl_subvol_getflags(file, argp); | |
4510 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
4511 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
4512 | case BTRFS_IOC_DEFAULT_SUBVOL: |
4513 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 4514 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
4515 | return btrfs_ioctl_defrag(file, NULL); |
4516 | case BTRFS_IOC_DEFRAG_RANGE: | |
4517 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 4518 | case BTRFS_IOC_RESIZE: |
198605a8 | 4519 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 4520 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 4521 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 4522 | case BTRFS_IOC_RM_DEV: |
da24927b | 4523 | return btrfs_ioctl_rm_dev(file, argp); |
475f6387 JS |
4524 | case BTRFS_IOC_FS_INFO: |
4525 | return btrfs_ioctl_fs_info(root, argp); | |
4526 | case BTRFS_IOC_DEV_INFO: | |
4527 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 4528 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 4529 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 | 4530 | case BTRFS_IOC_CLONE: |
c5c9cd4d SW |
4531 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
4532 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 4533 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
4534 | case BTRFS_IOC_TRANS_START: |
4535 | return btrfs_ioctl_trans_start(file); | |
4536 | case BTRFS_IOC_TRANS_END: | |
4537 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
4538 | case BTRFS_IOC_TREE_SEARCH: |
4539 | return btrfs_ioctl_tree_search(file, argp); | |
4540 | case BTRFS_IOC_INO_LOOKUP: | |
4541 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
4542 | case BTRFS_IOC_INO_PATHS: |
4543 | return btrfs_ioctl_ino_to_path(root, argp); | |
4544 | case BTRFS_IOC_LOGICAL_INO: | |
4545 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
4546 | case BTRFS_IOC_SPACE_INFO: |
4547 | return btrfs_ioctl_space_info(root, argp); | |
9b199859 FDBM |
4548 | case BTRFS_IOC_SYNC: { |
4549 | int ret; | |
4550 | ||
91aef86f | 4551 | ret = btrfs_start_delalloc_roots(root->fs_info, 0); |
9b199859 FDBM |
4552 | if (ret) |
4553 | return ret; | |
4554 | ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
4555 | return ret; | |
4556 | } | |
46204592 | 4557 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 4558 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 4559 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 4560 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 | 4561 | case BTRFS_IOC_SCRUB: |
b8e95489 | 4562 | return btrfs_ioctl_scrub(file, argp); |
475f6387 JS |
4563 | case BTRFS_IOC_SCRUB_CANCEL: |
4564 | return btrfs_ioctl_scrub_cancel(root, argp); | |
4565 | case BTRFS_IOC_SCRUB_PROGRESS: | |
4566 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 4567 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 4568 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
4569 | case BTRFS_IOC_BALANCE_CTL: |
4570 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
4571 | case BTRFS_IOC_BALANCE_PROGRESS: |
4572 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
4573 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
4574 | return btrfs_ioctl_set_received_subvol(file, argp); | |
31db9f7c AB |
4575 | case BTRFS_IOC_SEND: |
4576 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 4577 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 4578 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b | 4579 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 4580 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 4581 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 4582 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 4583 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 4584 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 4585 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 4586 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
4587 | case BTRFS_IOC_QUOTA_RESCAN: |
4588 | return btrfs_ioctl_quota_rescan(file, argp); | |
4589 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
4590 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
4591 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
4592 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd SB |
4593 | case BTRFS_IOC_DEV_REPLACE: |
4594 | return btrfs_ioctl_dev_replace(root, argp); | |
867ab667 | 4595 | case BTRFS_IOC_GET_FSLABEL: |
4596 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 4597 | case BTRFS_IOC_SET_FSLABEL: |
4598 | return btrfs_ioctl_set_fslabel(file, argp); | |
416161db MF |
4599 | case BTRFS_IOC_FILE_EXTENT_SAME: |
4600 | return btrfs_ioctl_file_extent_same(file, argp); | |
f46b5a66 CH |
4601 | } |
4602 | ||
4603 | return -ENOTTY; | |
4604 | } |