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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" |
63541927 | 59 | #include "props.h" |
3b02a68a | 60 | #include "sysfs.h" |
f46b5a66 | 61 | |
416161db MF |
62 | static int btrfs_clone(struct inode *src, struct inode *inode, |
63 | u64 off, u64 olen, u64 olen_aligned, u64 destoff); | |
64 | ||
6cbff00f CH |
65 | /* Mask out flags that are inappropriate for the given type of inode. */ |
66 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
67 | { | |
68 | if (S_ISDIR(mode)) | |
69 | return flags; | |
70 | else if (S_ISREG(mode)) | |
71 | return flags & ~FS_DIRSYNC_FL; | |
72 | else | |
73 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
74 | } | |
75 | ||
76 | /* | |
77 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
78 | */ | |
79 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
80 | { | |
81 | unsigned int iflags = 0; | |
82 | ||
83 | if (flags & BTRFS_INODE_SYNC) | |
84 | iflags |= FS_SYNC_FL; | |
85 | if (flags & BTRFS_INODE_IMMUTABLE) | |
86 | iflags |= FS_IMMUTABLE_FL; | |
87 | if (flags & BTRFS_INODE_APPEND) | |
88 | iflags |= FS_APPEND_FL; | |
89 | if (flags & BTRFS_INODE_NODUMP) | |
90 | iflags |= FS_NODUMP_FL; | |
91 | if (flags & BTRFS_INODE_NOATIME) | |
92 | iflags |= FS_NOATIME_FL; | |
93 | if (flags & BTRFS_INODE_DIRSYNC) | |
94 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
95 | if (flags & BTRFS_INODE_NODATACOW) |
96 | iflags |= FS_NOCOW_FL; | |
97 | ||
98 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
99 | iflags |= FS_COMPR_FL; | |
100 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
101 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
102 | |
103 | return iflags; | |
104 | } | |
105 | ||
106 | /* | |
107 | * Update inode->i_flags based on the btrfs internal flags. | |
108 | */ | |
109 | void btrfs_update_iflags(struct inode *inode) | |
110 | { | |
111 | struct btrfs_inode *ip = BTRFS_I(inode); | |
112 | ||
113 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); | |
114 | ||
115 | if (ip->flags & BTRFS_INODE_SYNC) | |
116 | inode->i_flags |= S_SYNC; | |
117 | if (ip->flags & BTRFS_INODE_IMMUTABLE) | |
118 | inode->i_flags |= S_IMMUTABLE; | |
119 | if (ip->flags & BTRFS_INODE_APPEND) | |
120 | inode->i_flags |= S_APPEND; | |
121 | if (ip->flags & BTRFS_INODE_NOATIME) | |
122 | inode->i_flags |= S_NOATIME; | |
123 | if (ip->flags & BTRFS_INODE_DIRSYNC) | |
124 | inode->i_flags |= S_DIRSYNC; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Inherit flags from the parent inode. | |
129 | * | |
e27425d6 | 130 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
131 | */ |
132 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
133 | { | |
0b4dcea5 CM |
134 | unsigned int flags; |
135 | ||
136 | if (!dir) | |
137 | return; | |
138 | ||
139 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 140 | |
e27425d6 JB |
141 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
142 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
143 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
144 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
145 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
146 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
147 | } | |
148 | ||
213490b3 | 149 | if (flags & BTRFS_INODE_NODATACOW) { |
e27425d6 | 150 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
213490b3 LB |
151 | if (S_ISREG(inode->i_mode)) |
152 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
153 | } | |
6cbff00f | 154 | |
6cbff00f CH |
155 | btrfs_update_iflags(inode); |
156 | } | |
157 | ||
158 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
159 | { | |
496ad9aa | 160 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
161 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
162 | ||
163 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
164 | return -EFAULT; | |
165 | return 0; | |
166 | } | |
167 | ||
75e7cb7f LB |
168 | static int check_flags(unsigned int flags) |
169 | { | |
170 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
171 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
172 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
173 | FS_NOCOMP_FL | FS_COMPR_FL | |
174 | FS_NOCOW_FL)) | |
75e7cb7f LB |
175 | return -EOPNOTSUPP; |
176 | ||
177 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
178 | return -EINVAL; | |
179 | ||
75e7cb7f LB |
180 | return 0; |
181 | } | |
182 | ||
6cbff00f CH |
183 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
184 | { | |
496ad9aa | 185 | struct inode *inode = file_inode(file); |
6cbff00f CH |
186 | struct btrfs_inode *ip = BTRFS_I(inode); |
187 | struct btrfs_root *root = ip->root; | |
188 | struct btrfs_trans_handle *trans; | |
189 | unsigned int flags, oldflags; | |
190 | int ret; | |
f062abf0 LZ |
191 | u64 ip_oldflags; |
192 | unsigned int i_oldflags; | |
7e97b8da | 193 | umode_t mode; |
6cbff00f | 194 | |
b83cc969 LZ |
195 | if (btrfs_root_readonly(root)) |
196 | return -EROFS; | |
197 | ||
6cbff00f CH |
198 | if (copy_from_user(&flags, arg, sizeof(flags))) |
199 | return -EFAULT; | |
200 | ||
75e7cb7f LB |
201 | ret = check_flags(flags); |
202 | if (ret) | |
203 | return ret; | |
f46b5a66 | 204 | |
2e149670 | 205 | if (!inode_owner_or_capable(inode)) |
6cbff00f CH |
206 | return -EACCES; |
207 | ||
e7848683 JK |
208 | ret = mnt_want_write_file(file); |
209 | if (ret) | |
210 | return ret; | |
211 | ||
6cbff00f CH |
212 | mutex_lock(&inode->i_mutex); |
213 | ||
f062abf0 LZ |
214 | ip_oldflags = ip->flags; |
215 | i_oldflags = inode->i_flags; | |
7e97b8da | 216 | mode = inode->i_mode; |
f062abf0 | 217 | |
6cbff00f CH |
218 | flags = btrfs_mask_flags(inode->i_mode, flags); |
219 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
220 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
221 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
222 | ret = -EPERM; | |
223 | goto out_unlock; | |
224 | } | |
225 | } | |
226 | ||
6cbff00f CH |
227 | if (flags & FS_SYNC_FL) |
228 | ip->flags |= BTRFS_INODE_SYNC; | |
229 | else | |
230 | ip->flags &= ~BTRFS_INODE_SYNC; | |
231 | if (flags & FS_IMMUTABLE_FL) | |
232 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
233 | else | |
234 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
235 | if (flags & FS_APPEND_FL) | |
236 | ip->flags |= BTRFS_INODE_APPEND; | |
237 | else | |
238 | ip->flags &= ~BTRFS_INODE_APPEND; | |
239 | if (flags & FS_NODUMP_FL) | |
240 | ip->flags |= BTRFS_INODE_NODUMP; | |
241 | else | |
242 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
243 | if (flags & FS_NOATIME_FL) | |
244 | ip->flags |= BTRFS_INODE_NOATIME; | |
245 | else | |
246 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
247 | if (flags & FS_DIRSYNC_FL) | |
248 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
249 | else | |
250 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
251 | if (flags & FS_NOCOW_FL) { |
252 | if (S_ISREG(mode)) { | |
253 | /* | |
254 | * It's safe to turn csums off here, no extents exist. | |
255 | * Otherwise we want the flag to reflect the real COW | |
256 | * status of the file and will not set it. | |
257 | */ | |
258 | if (inode->i_size == 0) | |
259 | ip->flags |= BTRFS_INODE_NODATACOW | |
260 | | BTRFS_INODE_NODATASUM; | |
261 | } else { | |
262 | ip->flags |= BTRFS_INODE_NODATACOW; | |
263 | } | |
264 | } else { | |
265 | /* | |
266 | * Revert back under same assuptions as above | |
267 | */ | |
268 | if (S_ISREG(mode)) { | |
269 | if (inode->i_size == 0) | |
270 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
271 | | BTRFS_INODE_NODATASUM); | |
272 | } else { | |
273 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
274 | } | |
275 | } | |
6cbff00f | 276 | |
75e7cb7f LB |
277 | /* |
278 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
279 | * flag may be changed automatically if compression code won't make | |
280 | * things smaller. | |
281 | */ | |
282 | if (flags & FS_NOCOMP_FL) { | |
283 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
284 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
285 | |
286 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); | |
287 | if (ret && ret != -ENODATA) | |
288 | goto out_drop; | |
75e7cb7f | 289 | } else if (flags & FS_COMPR_FL) { |
63541927 FDBM |
290 | const char *comp; |
291 | ||
75e7cb7f LB |
292 | ip->flags |= BTRFS_INODE_COMPRESS; |
293 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
294 | |
295 | if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) | |
296 | comp = "lzo"; | |
297 | else | |
298 | comp = "zlib"; | |
299 | ret = btrfs_set_prop(inode, "btrfs.compression", | |
300 | comp, strlen(comp), 0); | |
301 | if (ret) | |
302 | goto out_drop; | |
303 | ||
ebcb904d LZ |
304 | } else { |
305 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); | |
75e7cb7f | 306 | } |
6cbff00f | 307 | |
4da6f1a3 | 308 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
309 | if (IS_ERR(trans)) { |
310 | ret = PTR_ERR(trans); | |
311 | goto out_drop; | |
312 | } | |
6cbff00f | 313 | |
306424cc | 314 | btrfs_update_iflags(inode); |
0c4d2d95 | 315 | inode_inc_iversion(inode); |
306424cc | 316 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 317 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 318 | |
6cbff00f | 319 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
320 | out_drop: |
321 | if (ret) { | |
322 | ip->flags = ip_oldflags; | |
323 | inode->i_flags = i_oldflags; | |
324 | } | |
6cbff00f | 325 | |
6cbff00f CH |
326 | out_unlock: |
327 | mutex_unlock(&inode->i_mutex); | |
e7848683 | 328 | mnt_drop_write_file(file); |
2d4e6f6a | 329 | return ret; |
6cbff00f CH |
330 | } |
331 | ||
332 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
333 | { | |
496ad9aa | 334 | struct inode *inode = file_inode(file); |
6cbff00f CH |
335 | |
336 | return put_user(inode->i_generation, arg); | |
337 | } | |
f46b5a66 | 338 | |
f7039b1d LD |
339 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
340 | { | |
54563d41 | 341 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
f7039b1d LD |
342 | struct btrfs_device *device; |
343 | struct request_queue *q; | |
344 | struct fstrim_range range; | |
345 | u64 minlen = ULLONG_MAX; | |
346 | u64 num_devices = 0; | |
815745cf | 347 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
348 | int ret; |
349 | ||
350 | if (!capable(CAP_SYS_ADMIN)) | |
351 | return -EPERM; | |
352 | ||
1f78160c XG |
353 | rcu_read_lock(); |
354 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
355 | dev_list) { | |
f7039b1d LD |
356 | if (!device->bdev) |
357 | continue; | |
358 | q = bdev_get_queue(device->bdev); | |
359 | if (blk_queue_discard(q)) { | |
360 | num_devices++; | |
361 | minlen = min((u64)q->limits.discard_granularity, | |
362 | minlen); | |
363 | } | |
364 | } | |
1f78160c | 365 | rcu_read_unlock(); |
f4c697e6 | 366 | |
f7039b1d LD |
367 | if (!num_devices) |
368 | return -EOPNOTSUPP; | |
f7039b1d LD |
369 | if (copy_from_user(&range, arg, sizeof(range))) |
370 | return -EFAULT; | |
e515c18b LC |
371 | if (range.start > total_bytes || |
372 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 373 | return -EINVAL; |
f7039b1d | 374 | |
f4c697e6 | 375 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 376 | range.minlen = max(range.minlen, minlen); |
815745cf | 377 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
378 | if (ret < 0) |
379 | return ret; | |
380 | ||
381 | if (copy_to_user(arg, &range, sizeof(range))) | |
382 | return -EFAULT; | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
dd5f9615 SB |
387 | int btrfs_is_empty_uuid(u8 *uuid) |
388 | { | |
46e0f66a CM |
389 | int i; |
390 | ||
391 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
392 | if (uuid[i]) | |
393 | return 0; | |
394 | } | |
395 | return 1; | |
dd5f9615 SB |
396 | } |
397 | ||
d5c12070 | 398 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 399 | struct dentry *dentry, |
72fd032e | 400 | char *name, int namelen, |
6f72c7e2 | 401 | u64 *async_transid, |
8696c533 | 402 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 CH |
403 | { |
404 | struct btrfs_trans_handle *trans; | |
405 | struct btrfs_key key; | |
406 | struct btrfs_root_item root_item; | |
407 | struct btrfs_inode_item *inode_item; | |
408 | struct extent_buffer *leaf; | |
d5c12070 | 409 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 410 | struct btrfs_root *new_root; |
d5c12070 | 411 | struct btrfs_block_rsv block_rsv; |
8ea05e3a | 412 | struct timespec cur_time = CURRENT_TIME; |
5662344b | 413 | struct inode *inode; |
f46b5a66 CH |
414 | int ret; |
415 | int err; | |
416 | u64 objectid; | |
417 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 418 | u64 index = 0; |
d5c12070 | 419 | u64 qgroup_reserved; |
8ea05e3a | 420 | uuid_le new_uuid; |
f46b5a66 | 421 | |
581bb050 | 422 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 423 | if (ret) |
a22285a6 | 424 | return ret; |
6a912213 | 425 | |
d5c12070 | 426 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 427 | /* |
d5c12070 MX |
428 | * The same as the snapshot creation, please see the comment |
429 | * of create_snapshot(). | |
9ed74f2d | 430 | */ |
d5c12070 | 431 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
dd5f9615 | 432 | 8, &qgroup_reserved, false); |
d5c12070 MX |
433 | if (ret) |
434 | return ret; | |
435 | ||
436 | trans = btrfs_start_transaction(root, 0); | |
437 | if (IS_ERR(trans)) { | |
438 | ret = PTR_ERR(trans); | |
de6e8200 LB |
439 | btrfs_subvolume_release_metadata(root, &block_rsv, |
440 | qgroup_reserved); | |
441 | return ret; | |
d5c12070 MX |
442 | } |
443 | trans->block_rsv = &block_rsv; | |
444 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 445 | |
8696c533 | 446 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
447 | if (ret) |
448 | goto fail; | |
449 | ||
5d4f98a2 | 450 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, |
5581a51a | 451 | 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
452 | if (IS_ERR(leaf)) { |
453 | ret = PTR_ERR(leaf); | |
454 | goto fail; | |
455 | } | |
f46b5a66 | 456 | |
5d4f98a2 | 457 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
458 | btrfs_set_header_bytenr(leaf, leaf->start); |
459 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 460 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
461 | btrfs_set_header_owner(leaf, objectid); |
462 | ||
0a4e5586 | 463 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
f46b5a66 | 464 | BTRFS_FSID_SIZE); |
5d4f98a2 | 465 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
b308bc2f | 466 | btrfs_header_chunk_tree_uuid(leaf), |
5d4f98a2 | 467 | BTRFS_UUID_SIZE); |
f46b5a66 CH |
468 | btrfs_mark_buffer_dirty(leaf); |
469 | ||
8ea05e3a AB |
470 | memset(&root_item, 0, sizeof(root_item)); |
471 | ||
f46b5a66 | 472 | inode_item = &root_item.inode; |
3cae210f QW |
473 | btrfs_set_stack_inode_generation(inode_item, 1); |
474 | btrfs_set_stack_inode_size(inode_item, 3); | |
475 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
476 | btrfs_set_stack_inode_nbytes(inode_item, root->leafsize); | |
477 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); | |
f46b5a66 | 478 | |
3cae210f QW |
479 | btrfs_set_root_flags(&root_item, 0); |
480 | btrfs_set_root_limit(&root_item, 0); | |
481 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); | |
08fe4db1 | 482 | |
f46b5a66 | 483 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 484 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
485 | btrfs_set_root_level(&root_item, 0); |
486 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 487 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 488 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 489 | |
8ea05e3a AB |
490 | btrfs_set_root_generation_v2(&root_item, |
491 | btrfs_root_generation(&root_item)); | |
492 | uuid_le_gen(&new_uuid); | |
493 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
3cae210f QW |
494 | btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); |
495 | btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); | |
8ea05e3a AB |
496 | root_item.ctime = root_item.otime; |
497 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
498 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 499 | |
925baedd | 500 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
501 | free_extent_buffer(leaf); |
502 | leaf = NULL; | |
503 | ||
504 | btrfs_set_root_dirid(&root_item, new_dirid); | |
505 | ||
506 | key.objectid = objectid; | |
5d4f98a2 | 507 | key.offset = 0; |
f46b5a66 CH |
508 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
509 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
510 | &root_item); | |
511 | if (ret) | |
512 | goto fail; | |
513 | ||
76dda93c YZ |
514 | key.offset = (u64)-1; |
515 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
516 | if (IS_ERR(new_root)) { |
517 | btrfs_abort_transaction(trans, root, PTR_ERR(new_root)); | |
518 | ret = PTR_ERR(new_root); | |
519 | goto fail; | |
520 | } | |
76dda93c YZ |
521 | |
522 | btrfs_record_root_in_trans(trans, new_root); | |
523 | ||
63541927 | 524 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
ce598979 MF |
525 | if (ret) { |
526 | /* We potentially lose an unused inode item here */ | |
79787eaa | 527 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
528 | goto fail; |
529 | } | |
530 | ||
f46b5a66 CH |
531 | /* |
532 | * insert the directory item | |
533 | */ | |
3de4586c | 534 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
535 | if (ret) { |
536 | btrfs_abort_transaction(trans, root, ret); | |
537 | goto fail; | |
538 | } | |
3de4586c CM |
539 | |
540 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 541 | name, namelen, dir, &key, |
3de4586c | 542 | BTRFS_FT_DIR, index); |
79787eaa JM |
543 | if (ret) { |
544 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 545 | goto fail; |
79787eaa | 546 | } |
0660b5af | 547 | |
52c26179 YZ |
548 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
549 | ret = btrfs_update_inode(trans, root, dir); | |
550 | BUG_ON(ret); | |
551 | ||
0660b5af | 552 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 553 | objectid, root->root_key.objectid, |
33345d01 | 554 | btrfs_ino(dir), index, name, namelen); |
76dda93c | 555 | BUG_ON(ret); |
f46b5a66 | 556 | |
dd5f9615 SB |
557 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
558 | root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
559 | objectid); | |
560 | if (ret) | |
561 | btrfs_abort_transaction(trans, root, ret); | |
562 | ||
f46b5a66 | 563 | fail: |
d5c12070 MX |
564 | trans->block_rsv = NULL; |
565 | trans->bytes_reserved = 0; | |
de6e8200 LB |
566 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
567 | ||
72fd032e SW |
568 | if (async_transid) { |
569 | *async_transid = trans->transid; | |
570 | err = btrfs_commit_transaction_async(trans, root, 1); | |
00d71c9c MX |
571 | if (err) |
572 | err = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
573 | } else { |
574 | err = btrfs_commit_transaction(trans, root); | |
575 | } | |
f46b5a66 CH |
576 | if (err && !ret) |
577 | ret = err; | |
1a65e24b | 578 | |
5662344b TI |
579 | if (!ret) { |
580 | inode = btrfs_lookup_dentry(dir, dentry); | |
de6e8200 LB |
581 | if (IS_ERR(inode)) |
582 | return PTR_ERR(inode); | |
5662344b TI |
583 | d_instantiate(dentry, inode); |
584 | } | |
f46b5a66 CH |
585 | return ret; |
586 | } | |
587 | ||
e9662f70 MX |
588 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
589 | struct dentry *dentry, char *name, int namelen, | |
590 | u64 *async_transid, bool readonly, | |
591 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 592 | { |
2e4bfab9 | 593 | struct inode *inode; |
f46b5a66 CH |
594 | struct btrfs_pending_snapshot *pending_snapshot; |
595 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 596 | int ret; |
f46b5a66 CH |
597 | |
598 | if (!root->ref_cows) | |
599 | return -EINVAL; | |
600 | ||
6a03843d MX |
601 | ret = btrfs_start_delalloc_inodes(root, 0); |
602 | if (ret) | |
603 | return ret; | |
604 | ||
b0244199 | 605 | btrfs_wait_ordered_extents(root, -1); |
6a03843d | 606 | |
3de4586c | 607 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
a22285a6 YZ |
608 | if (!pending_snapshot) |
609 | return -ENOMEM; | |
610 | ||
66d8f3dd MX |
611 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
612 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
613 | /* |
614 | * 1 - parent dir inode | |
615 | * 2 - dir entries | |
616 | * 1 - root item | |
617 | * 2 - root ref/backref | |
618 | * 1 - root of snapshot | |
dd5f9615 | 619 | * 1 - UUID item |
d5c12070 MX |
620 | */ |
621 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 622 | &pending_snapshot->block_rsv, 8, |
ee3441b4 JM |
623 | &pending_snapshot->qgroup_reserved, |
624 | false); | |
d5c12070 MX |
625 | if (ret) |
626 | goto out; | |
627 | ||
3de4586c | 628 | pending_snapshot->dentry = dentry; |
f46b5a66 | 629 | pending_snapshot->root = root; |
b83cc969 | 630 | pending_snapshot->readonly = readonly; |
e9662f70 | 631 | pending_snapshot->dir = dir; |
8696c533 | 632 | pending_snapshot->inherit = inherit; |
a22285a6 | 633 | |
d5c12070 | 634 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
635 | if (IS_ERR(trans)) { |
636 | ret = PTR_ERR(trans); | |
637 | goto fail; | |
638 | } | |
639 | ||
8351583e | 640 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
641 | list_add(&pending_snapshot->list, |
642 | &trans->transaction->pending_snapshots); | |
8351583e | 643 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
644 | if (async_transid) { |
645 | *async_transid = trans->transid; | |
646 | ret = btrfs_commit_transaction_async(trans, | |
647 | root->fs_info->extent_root, 1); | |
00d71c9c MX |
648 | if (ret) |
649 | ret = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
650 | } else { |
651 | ret = btrfs_commit_transaction(trans, | |
652 | root->fs_info->extent_root); | |
653 | } | |
aec8030a | 654 | if (ret) |
c37b2b62 | 655 | goto fail; |
a22285a6 YZ |
656 | |
657 | ret = pending_snapshot->error; | |
658 | if (ret) | |
659 | goto fail; | |
660 | ||
66b4ffd1 JB |
661 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
662 | if (ret) | |
663 | goto fail; | |
f46b5a66 | 664 | |
2fbe8c8a | 665 | inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry); |
2e4bfab9 YZ |
666 | if (IS_ERR(inode)) { |
667 | ret = PTR_ERR(inode); | |
668 | goto fail; | |
669 | } | |
5662344b | 670 | |
2e4bfab9 YZ |
671 | d_instantiate(dentry, inode); |
672 | ret = 0; | |
673 | fail: | |
d5c12070 MX |
674 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
675 | &pending_snapshot->block_rsv, | |
676 | pending_snapshot->qgroup_reserved); | |
677 | out: | |
a22285a6 | 678 | kfree(pending_snapshot); |
f46b5a66 CH |
679 | return ret; |
680 | } | |
681 | ||
4260f7c7 SW |
682 | /* copy of check_sticky in fs/namei.c() |
683 | * It's inline, so penalty for filesystems that don't use sticky bit is | |
684 | * minimal. | |
685 | */ | |
686 | static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) | |
687 | { | |
2f2f43d3 | 688 | kuid_t fsuid = current_fsuid(); |
4260f7c7 SW |
689 | |
690 | if (!(dir->i_mode & S_ISVTX)) | |
691 | return 0; | |
2f2f43d3 | 692 | if (uid_eq(inode->i_uid, fsuid)) |
4260f7c7 | 693 | return 0; |
2f2f43d3 | 694 | if (uid_eq(dir->i_uid, fsuid)) |
4260f7c7 SW |
695 | return 0; |
696 | return !capable(CAP_FOWNER); | |
697 | } | |
698 | ||
699 | /* copy of may_delete in fs/namei.c() | |
700 | * Check whether we can remove a link victim from directory dir, check | |
701 | * whether the type of victim is right. | |
702 | * 1. We can't do it if dir is read-only (done in permission()) | |
703 | * 2. We should have write and exec permissions on dir | |
704 | * 3. We can't remove anything from append-only dir | |
705 | * 4. We can't do anything with immutable dir (done in permission()) | |
706 | * 5. If the sticky bit on dir is set we should either | |
707 | * a. be owner of dir, or | |
708 | * b. be owner of victim, or | |
709 | * c. have CAP_FOWNER capability | |
710 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
711 | * links pointing to it. | |
712 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
713 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
714 | * 9. We can't remove a root or mountpoint. | |
715 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
716 | * nfs_async_unlink(). | |
717 | */ | |
718 | ||
67871254 | 719 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
720 | { |
721 | int error; | |
722 | ||
723 | if (!victim->d_inode) | |
724 | return -ENOENT; | |
725 | ||
726 | BUG_ON(victim->d_parent->d_inode != dir); | |
4fa6b5ec | 727 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
728 | |
729 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
730 | if (error) | |
731 | return error; | |
732 | if (IS_APPEND(dir)) | |
733 | return -EPERM; | |
734 | if (btrfs_check_sticky(dir, victim->d_inode)|| | |
735 | IS_APPEND(victim->d_inode)|| | |
736 | IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) | |
737 | return -EPERM; | |
738 | if (isdir) { | |
739 | if (!S_ISDIR(victim->d_inode->i_mode)) | |
740 | return -ENOTDIR; | |
741 | if (IS_ROOT(victim)) | |
742 | return -EBUSY; | |
743 | } else if (S_ISDIR(victim->d_inode->i_mode)) | |
744 | return -EISDIR; | |
745 | if (IS_DEADDIR(dir)) | |
746 | return -ENOENT; | |
747 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
748 | return -EBUSY; | |
749 | return 0; | |
750 | } | |
751 | ||
cb8e7090 CH |
752 | /* copy of may_create in fs/namei.c() */ |
753 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
754 | { | |
755 | if (child->d_inode) | |
756 | return -EEXIST; | |
757 | if (IS_DEADDIR(dir)) | |
758 | return -ENOENT; | |
759 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
760 | } | |
761 | ||
762 | /* | |
763 | * Create a new subvolume below @parent. This is largely modeled after | |
764 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
765 | * inside this filesystem so it's quite a bit simpler. | |
766 | */ | |
76dda93c YZ |
767 | static noinline int btrfs_mksubvol(struct path *parent, |
768 | char *name, int namelen, | |
72fd032e | 769 | struct btrfs_root *snap_src, |
6f72c7e2 | 770 | u64 *async_transid, bool readonly, |
8696c533 | 771 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 772 | { |
76dda93c | 773 | struct inode *dir = parent->dentry->d_inode; |
cb8e7090 CH |
774 | struct dentry *dentry; |
775 | int error; | |
776 | ||
5c50c9b8 DS |
777 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
778 | if (error == -EINTR) | |
779 | return error; | |
cb8e7090 CH |
780 | |
781 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
782 | error = PTR_ERR(dentry); | |
783 | if (IS_ERR(dentry)) | |
784 | goto out_unlock; | |
785 | ||
786 | error = -EEXIST; | |
787 | if (dentry->d_inode) | |
788 | goto out_dput; | |
789 | ||
76dda93c | 790 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 791 | if (error) |
a874a63e | 792 | goto out_dput; |
cb8e7090 | 793 | |
9c52057c CM |
794 | /* |
795 | * even if this name doesn't exist, we may get hash collisions. | |
796 | * check for them now when we can safely fail | |
797 | */ | |
798 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
799 | dir->i_ino, name, | |
800 | namelen); | |
801 | if (error) | |
802 | goto out_dput; | |
803 | ||
76dda93c YZ |
804 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
805 | ||
806 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
807 | goto out_up_read; | |
808 | ||
3de4586c | 809 | if (snap_src) { |
e9662f70 | 810 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
6f72c7e2 | 811 | async_transid, readonly, inherit); |
3de4586c | 812 | } else { |
d5c12070 MX |
813 | error = create_subvol(dir, dentry, name, namelen, |
814 | async_transid, inherit); | |
3de4586c | 815 | } |
76dda93c YZ |
816 | if (!error) |
817 | fsnotify_mkdir(dir, dentry); | |
818 | out_up_read: | |
819 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
820 | out_dput: |
821 | dput(dentry); | |
822 | out_unlock: | |
76dda93c | 823 | mutex_unlock(&dir->i_mutex); |
cb8e7090 CH |
824 | return error; |
825 | } | |
826 | ||
4cb5300b CM |
827 | /* |
828 | * When we're defragging a range, we don't want to kick it off again | |
829 | * if it is really just waiting for delalloc to send it down. | |
830 | * If we find a nice big extent or delalloc range for the bytes in the | |
831 | * file you want to defrag, we return 0 to let you know to skip this | |
832 | * part of the file | |
833 | */ | |
834 | static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh) | |
835 | { | |
836 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
837 | struct extent_map *em = NULL; | |
838 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
839 | u64 end; | |
840 | ||
841 | read_lock(&em_tree->lock); | |
842 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
843 | read_unlock(&em_tree->lock); | |
844 | ||
845 | if (em) { | |
846 | end = extent_map_end(em); | |
847 | free_extent_map(em); | |
848 | if (end - offset > thresh) | |
849 | return 0; | |
850 | } | |
851 | /* if we already have a nice delalloc here, just stop */ | |
852 | thresh /= 2; | |
853 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
854 | thresh, EXTENT_DELALLOC, 1); | |
855 | if (end >= thresh) | |
856 | return 0; | |
857 | return 1; | |
858 | } | |
859 | ||
860 | /* | |
861 | * helper function to walk through a file and find extents | |
862 | * newer than a specific transid, and smaller than thresh. | |
863 | * | |
864 | * This is used by the defragging code to find new and small | |
865 | * extents | |
866 | */ | |
867 | static int find_new_extents(struct btrfs_root *root, | |
868 | struct inode *inode, u64 newer_than, | |
869 | u64 *off, int thresh) | |
870 | { | |
871 | struct btrfs_path *path; | |
872 | struct btrfs_key min_key; | |
4cb5300b CM |
873 | struct extent_buffer *leaf; |
874 | struct btrfs_file_extent_item *extent; | |
875 | int type; | |
876 | int ret; | |
a4689d2b | 877 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
878 | |
879 | path = btrfs_alloc_path(); | |
880 | if (!path) | |
881 | return -ENOMEM; | |
882 | ||
a4689d2b | 883 | min_key.objectid = ino; |
4cb5300b CM |
884 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
885 | min_key.offset = *off; | |
886 | ||
4cb5300b CM |
887 | path->keep_locks = 1; |
888 | ||
67871254 | 889 | while (1) { |
6174d3cb | 890 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
4cb5300b CM |
891 | if (ret != 0) |
892 | goto none; | |
a4689d2b | 893 | if (min_key.objectid != ino) |
4cb5300b CM |
894 | goto none; |
895 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
896 | goto none; | |
897 | ||
898 | leaf = path->nodes[0]; | |
899 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
900 | struct btrfs_file_extent_item); | |
901 | ||
902 | type = btrfs_file_extent_type(leaf, extent); | |
903 | if (type == BTRFS_FILE_EXTENT_REG && | |
904 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
905 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
906 | *off = min_key.offset; | |
907 | btrfs_free_path(path); | |
908 | return 0; | |
909 | } | |
910 | ||
911 | if (min_key.offset == (u64)-1) | |
912 | goto none; | |
913 | ||
914 | min_key.offset++; | |
915 | btrfs_release_path(path); | |
916 | } | |
917 | none: | |
918 | btrfs_free_path(path); | |
919 | return -ENOENT; | |
920 | } | |
921 | ||
6c282eb4 | 922 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
923 | { |
924 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
925 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
926 | struct extent_map *em; | |
927 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 928 | |
6c282eb4 LZ |
929 | /* |
930 | * hopefully we have this extent in the tree already, try without | |
931 | * the full extent lock | |
932 | */ | |
17ce6ef8 | 933 | read_lock(&em_tree->lock); |
6c282eb4 | 934 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
935 | read_unlock(&em_tree->lock); |
936 | ||
6c282eb4 LZ |
937 | if (!em) { |
938 | /* get the big lock and read metadata off disk */ | |
939 | lock_extent(io_tree, start, start + len - 1); | |
940 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
941 | unlock_extent(io_tree, start, start + len - 1); | |
942 | ||
943 | if (IS_ERR(em)) | |
944 | return NULL; | |
945 | } | |
946 | ||
947 | return em; | |
948 | } | |
17ce6ef8 | 949 | |
6c282eb4 LZ |
950 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
951 | { | |
952 | struct extent_map *next; | |
953 | bool ret = true; | |
954 | ||
955 | /* this is the last extent */ | |
956 | if (em->start + em->len >= i_size_read(inode)) | |
957 | return false; | |
958 | ||
959 | next = defrag_lookup_extent(inode, em->start + em->len); | |
960 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) | |
961 | ret = false; | |
962 | ||
963 | free_extent_map(next); | |
17ce6ef8 LB |
964 | return ret; |
965 | } | |
966 | ||
6c282eb4 | 967 | static int should_defrag_range(struct inode *inode, u64 start, int thresh, |
a43a2111 AM |
968 | u64 *last_len, u64 *skip, u64 *defrag_end, |
969 | int compress) | |
940100a4 | 970 | { |
6c282eb4 | 971 | struct extent_map *em; |
940100a4 | 972 | int ret = 1; |
6c282eb4 | 973 | bool next_mergeable = true; |
940100a4 CM |
974 | |
975 | /* | |
008873ea | 976 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
977 | * defragging it |
978 | */ | |
979 | if (start < *defrag_end) | |
980 | return 1; | |
981 | ||
982 | *skip = 0; | |
983 | ||
6c282eb4 LZ |
984 | em = defrag_lookup_extent(inode, start); |
985 | if (!em) | |
986 | return 0; | |
940100a4 CM |
987 | |
988 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 989 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 990 | ret = 0; |
17ce6ef8 LB |
991 | goto out; |
992 | } | |
993 | ||
6c282eb4 | 994 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 CM |
995 | |
996 | /* | |
6c282eb4 LZ |
997 | * we hit a real extent, if it is big or the next extent is not a |
998 | * real extent, don't bother defragging it | |
940100a4 | 999 | */ |
a43a2111 | 1000 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
6c282eb4 | 1001 | (em->len >= thresh || !next_mergeable)) |
940100a4 | 1002 | ret = 0; |
17ce6ef8 | 1003 | out: |
940100a4 CM |
1004 | /* |
1005 | * last_len ends up being a counter of how many bytes we've defragged. | |
1006 | * every time we choose not to defrag an extent, we reset *last_len | |
1007 | * so that the next tiny extent will force a defrag. | |
1008 | * | |
1009 | * The end result of this is that tiny extents before a single big | |
1010 | * extent will force at least part of that big extent to be defragged. | |
1011 | */ | |
1012 | if (ret) { | |
940100a4 CM |
1013 | *defrag_end = extent_map_end(em); |
1014 | } else { | |
1015 | *last_len = 0; | |
1016 | *skip = extent_map_end(em); | |
1017 | *defrag_end = 0; | |
1018 | } | |
1019 | ||
1020 | free_extent_map(em); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
4cb5300b CM |
1024 | /* |
1025 | * it doesn't do much good to defrag one or two pages | |
1026 | * at a time. This pulls in a nice chunk of pages | |
1027 | * to COW and defrag. | |
1028 | * | |
1029 | * It also makes sure the delalloc code has enough | |
1030 | * dirty data to avoid making new small extents as part | |
1031 | * of the defrag | |
1032 | * | |
1033 | * It's a good idea to start RA on this range | |
1034 | * before calling this. | |
1035 | */ | |
1036 | static int cluster_pages_for_defrag(struct inode *inode, | |
1037 | struct page **pages, | |
1038 | unsigned long start_index, | |
1039 | int num_pages) | |
f46b5a66 | 1040 | { |
4cb5300b CM |
1041 | unsigned long file_end; |
1042 | u64 isize = i_size_read(inode); | |
1043 | u64 page_start; | |
1044 | u64 page_end; | |
1f12bd06 | 1045 | u64 page_cnt; |
4cb5300b CM |
1046 | int ret; |
1047 | int i; | |
1048 | int i_done; | |
3eaa2885 | 1049 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1050 | struct extent_state *cached_state = NULL; |
600a45e1 | 1051 | struct extent_io_tree *tree; |
3b16a4e3 | 1052 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1053 | |
4cb5300b | 1054 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
1055 | if (!isize || start_index > file_end) |
1056 | return 0; | |
1057 | ||
1058 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
1059 | |
1060 | ret = btrfs_delalloc_reserve_space(inode, | |
1f12bd06 | 1061 | page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1062 | if (ret) |
1063 | return ret; | |
4cb5300b | 1064 | i_done = 0; |
600a45e1 | 1065 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1066 | |
1067 | /* step one, lock all the pages */ | |
1f12bd06 | 1068 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1069 | struct page *page; |
600a45e1 | 1070 | again: |
a94733d0 | 1071 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1072 | start_index + i, mask); |
4cb5300b CM |
1073 | if (!page) |
1074 | break; | |
1075 | ||
600a45e1 MX |
1076 | page_start = page_offset(page); |
1077 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1078 | while (1) { | |
d0082371 | 1079 | lock_extent(tree, page_start, page_end); |
600a45e1 MX |
1080 | ordered = btrfs_lookup_ordered_extent(inode, |
1081 | page_start); | |
d0082371 | 1082 | unlock_extent(tree, page_start, page_end); |
600a45e1 MX |
1083 | if (!ordered) |
1084 | break; | |
1085 | ||
1086 | unlock_page(page); | |
1087 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1088 | btrfs_put_ordered_extent(ordered); | |
1089 | lock_page(page); | |
1f12bd06 LB |
1090 | /* |
1091 | * we unlocked the page above, so we need check if | |
1092 | * it was released or not. | |
1093 | */ | |
1094 | if (page->mapping != inode->i_mapping) { | |
1095 | unlock_page(page); | |
1096 | page_cache_release(page); | |
1097 | goto again; | |
1098 | } | |
600a45e1 MX |
1099 | } |
1100 | ||
4cb5300b CM |
1101 | if (!PageUptodate(page)) { |
1102 | btrfs_readpage(NULL, page); | |
1103 | lock_page(page); | |
1104 | if (!PageUptodate(page)) { | |
1105 | unlock_page(page); | |
1106 | page_cache_release(page); | |
1107 | ret = -EIO; | |
1108 | break; | |
1109 | } | |
1110 | } | |
600a45e1 | 1111 | |
600a45e1 MX |
1112 | if (page->mapping != inode->i_mapping) { |
1113 | unlock_page(page); | |
1114 | page_cache_release(page); | |
1115 | goto again; | |
1116 | } | |
1117 | ||
4cb5300b CM |
1118 | pages[i] = page; |
1119 | i_done++; | |
1120 | } | |
1121 | if (!i_done || ret) | |
1122 | goto out; | |
1123 | ||
1124 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1125 | goto out; | |
1126 | ||
1127 | /* | |
1128 | * so now we have a nice long stream of locked | |
1129 | * and up to date pages, lets wait on them | |
1130 | */ | |
1131 | for (i = 0; i < i_done; i++) | |
1132 | wait_on_page_writeback(pages[i]); | |
1133 | ||
1134 | page_start = page_offset(pages[0]); | |
1135 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1136 | ||
1137 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
d0082371 | 1138 | page_start, page_end - 1, 0, &cached_state); |
4cb5300b CM |
1139 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1140 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1141 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1142 | &cached_state, GFP_NOFS); | |
4cb5300b | 1143 | |
1f12bd06 | 1144 | if (i_done != page_cnt) { |
9e0baf60 JB |
1145 | spin_lock(&BTRFS_I(inode)->lock); |
1146 | BTRFS_I(inode)->outstanding_extents++; | |
1147 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1148 | btrfs_delalloc_release_space(inode, |
1f12bd06 | 1149 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1150 | } |
1151 | ||
1152 | ||
9e8a4a8b LB |
1153 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1154 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1155 | |
1156 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1157 | page_start, page_end - 1, &cached_state, | |
1158 | GFP_NOFS); | |
1159 | ||
1160 | for (i = 0; i < i_done; i++) { | |
1161 | clear_page_dirty_for_io(pages[i]); | |
1162 | ClearPageChecked(pages[i]); | |
1163 | set_page_extent_mapped(pages[i]); | |
1164 | set_page_dirty(pages[i]); | |
1165 | unlock_page(pages[i]); | |
1166 | page_cache_release(pages[i]); | |
1167 | } | |
1168 | return i_done; | |
1169 | out: | |
1170 | for (i = 0; i < i_done; i++) { | |
1171 | unlock_page(pages[i]); | |
1172 | page_cache_release(pages[i]); | |
1173 | } | |
1f12bd06 | 1174 | btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT); |
4cb5300b CM |
1175 | return ret; |
1176 | ||
1177 | } | |
1178 | ||
1179 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1180 | struct btrfs_ioctl_defrag_range_args *range, | |
1181 | u64 newer_than, unsigned long max_to_defrag) | |
1182 | { | |
1183 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1184 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1185 | unsigned long last_index; |
151a31b2 | 1186 | u64 isize = i_size_read(inode); |
940100a4 CM |
1187 | u64 last_len = 0; |
1188 | u64 skip = 0; | |
1189 | u64 defrag_end = 0; | |
4cb5300b | 1190 | u64 newer_off = range->start; |
f46b5a66 | 1191 | unsigned long i; |
008873ea | 1192 | unsigned long ra_index = 0; |
f46b5a66 | 1193 | int ret; |
4cb5300b | 1194 | int defrag_count = 0; |
1a419d85 | 1195 | int compress_type = BTRFS_COMPRESS_ZLIB; |
4cb5300b | 1196 | int extent_thresh = range->extent_thresh; |
008873ea LZ |
1197 | int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT; |
1198 | int cluster = max_cluster; | |
4cb5300b CM |
1199 | u64 new_align = ~((u64)128 * 1024 - 1); |
1200 | struct page **pages = NULL; | |
1201 | ||
0abd5b17 LB |
1202 | if (isize == 0) |
1203 | return 0; | |
1204 | ||
1205 | if (range->start >= isize) | |
1206 | return -EINVAL; | |
1a419d85 LZ |
1207 | |
1208 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1209 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1210 | return -EINVAL; | |
1211 | if (range->compress_type) | |
1212 | compress_type = range->compress_type; | |
1213 | } | |
f46b5a66 | 1214 | |
0abd5b17 LB |
1215 | if (extent_thresh == 0) |
1216 | extent_thresh = 256 * 1024; | |
940100a4 | 1217 | |
4cb5300b CM |
1218 | /* |
1219 | * if we were not given a file, allocate a readahead | |
1220 | * context | |
1221 | */ | |
1222 | if (!file) { | |
1223 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1224 | if (!ra) | |
1225 | return -ENOMEM; | |
1226 | file_ra_state_init(ra, inode->i_mapping); | |
1227 | } else { | |
1228 | ra = &file->f_ra; | |
1229 | } | |
1230 | ||
d9b0d9ba | 1231 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
4cb5300b CM |
1232 | GFP_NOFS); |
1233 | if (!pages) { | |
1234 | ret = -ENOMEM; | |
1235 | goto out_ra; | |
1236 | } | |
1237 | ||
1238 | /* find the last page to defrag */ | |
1e701a32 | 1239 | if (range->start + range->len > range->start) { |
151a31b2 | 1240 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1241 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1242 | } else { | |
151a31b2 | 1243 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1244 | } |
1245 | ||
4cb5300b CM |
1246 | if (newer_than) { |
1247 | ret = find_new_extents(root, inode, newer_than, | |
1248 | &newer_off, 64 * 1024); | |
1249 | if (!ret) { | |
1250 | range->start = newer_off; | |
1251 | /* | |
1252 | * we always align our defrag to help keep | |
1253 | * the extents in the file evenly spaced | |
1254 | */ | |
1255 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1256 | } else |
1257 | goto out_ra; | |
1258 | } else { | |
1259 | i = range->start >> PAGE_CACHE_SHIFT; | |
1260 | } | |
1261 | if (!max_to_defrag) | |
7ec31b54 | 1262 | max_to_defrag = last_index + 1; |
4cb5300b | 1263 | |
2a0f7f57 LZ |
1264 | /* |
1265 | * make writeback starts from i, so the defrag range can be | |
1266 | * written sequentially. | |
1267 | */ | |
1268 | if (i < inode->i_mapping->writeback_index) | |
1269 | inode->i_mapping->writeback_index = i; | |
1270 | ||
f7f43cc8 CM |
1271 | while (i <= last_index && defrag_count < max_to_defrag && |
1272 | (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> | |
1273 | PAGE_CACHE_SHIFT)) { | |
4cb5300b CM |
1274 | /* |
1275 | * make sure we stop running if someone unmounts | |
1276 | * the FS | |
1277 | */ | |
1278 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1279 | break; | |
1280 | ||
210549eb | 1281 | if (btrfs_defrag_cancelled(root->fs_info)) { |
efe120a0 | 1282 | printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n"); |
210549eb DS |
1283 | ret = -EAGAIN; |
1284 | break; | |
1285 | } | |
1286 | ||
66c26892 | 1287 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1288 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1289 | &defrag_end, range->flags & |
1290 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1291 | unsigned long next; |
1292 | /* | |
1293 | * the should_defrag function tells us how much to skip | |
1294 | * bump our counter by the suggested amount | |
1295 | */ | |
1296 | next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; | |
1297 | i = max(i + 1, next); | |
1298 | continue; | |
1299 | } | |
008873ea LZ |
1300 | |
1301 | if (!newer_than) { | |
1302 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1303 | PAGE_CACHE_SHIFT) - i; | |
1304 | cluster = min(cluster, max_cluster); | |
1305 | } else { | |
1306 | cluster = max_cluster; | |
1307 | } | |
1308 | ||
008873ea LZ |
1309 | if (i + cluster > ra_index) { |
1310 | ra_index = max(i, ra_index); | |
1311 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1312 | cluster); | |
1313 | ra_index += max_cluster; | |
1314 | } | |
940100a4 | 1315 | |
ecb8bea8 | 1316 | mutex_lock(&inode->i_mutex); |
633085c7 FDBM |
1317 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1318 | BTRFS_I(inode)->force_compress = compress_type; | |
008873ea | 1319 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 LB |
1320 | if (ret < 0) { |
1321 | mutex_unlock(&inode->i_mutex); | |
4cb5300b | 1322 | goto out_ra; |
ecb8bea8 | 1323 | } |
4cb5300b CM |
1324 | |
1325 | defrag_count += ret; | |
d0e1d66b | 1326 | balance_dirty_pages_ratelimited(inode->i_mapping); |
ecb8bea8 | 1327 | mutex_unlock(&inode->i_mutex); |
4cb5300b CM |
1328 | |
1329 | if (newer_than) { | |
1330 | if (newer_off == (u64)-1) | |
1331 | break; | |
1332 | ||
e1f041e1 LB |
1333 | if (ret > 0) |
1334 | i += ret; | |
1335 | ||
4cb5300b CM |
1336 | newer_off = max(newer_off + 1, |
1337 | (u64)i << PAGE_CACHE_SHIFT); | |
1338 | ||
1339 | ret = find_new_extents(root, inode, | |
1340 | newer_than, &newer_off, | |
1341 | 64 * 1024); | |
1342 | if (!ret) { | |
1343 | range->start = newer_off; | |
1344 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1345 | } else { |
1346 | break; | |
f46b5a66 | 1347 | } |
4cb5300b | 1348 | } else { |
008873ea | 1349 | if (ret > 0) { |
cbcc8326 | 1350 | i += ret; |
008873ea LZ |
1351 | last_len += ret << PAGE_CACHE_SHIFT; |
1352 | } else { | |
cbcc8326 | 1353 | i++; |
008873ea LZ |
1354 | last_len = 0; |
1355 | } | |
f46b5a66 | 1356 | } |
f46b5a66 CH |
1357 | } |
1358 | ||
1e701a32 CM |
1359 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) |
1360 | filemap_flush(inode->i_mapping); | |
1361 | ||
1362 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1363 | /* the filemap_flush will queue IO into the worker threads, but | |
1364 | * we have to make sure the IO is actually started and that | |
1365 | * ordered extents get created before we return | |
1366 | */ | |
1367 | atomic_inc(&root->fs_info->async_submit_draining); | |
1368 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1369 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1370 | wait_event(root->fs_info->async_submit_wait, | |
1371 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1372 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1373 | } | |
1374 | atomic_dec(&root->fs_info->async_submit_draining); | |
1e701a32 CM |
1375 | } |
1376 | ||
1a419d85 | 1377 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1378 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1379 | } |
1380 | ||
60ccf82f | 1381 | ret = defrag_count; |
940100a4 | 1382 | |
4cb5300b | 1383 | out_ra: |
633085c7 FDBM |
1384 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
1385 | mutex_lock(&inode->i_mutex); | |
1386 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; | |
1387 | mutex_unlock(&inode->i_mutex); | |
1388 | } | |
4cb5300b CM |
1389 | if (!file) |
1390 | kfree(ra); | |
1391 | kfree(pages); | |
940100a4 | 1392 | return ret; |
f46b5a66 CH |
1393 | } |
1394 | ||
198605a8 | 1395 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1396 | void __user *arg) |
f46b5a66 CH |
1397 | { |
1398 | u64 new_size; | |
1399 | u64 old_size; | |
1400 | u64 devid = 1; | |
496ad9aa | 1401 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
1402 | struct btrfs_ioctl_vol_args *vol_args; |
1403 | struct btrfs_trans_handle *trans; | |
1404 | struct btrfs_device *device = NULL; | |
1405 | char *sizestr; | |
1406 | char *devstr = NULL; | |
1407 | int ret = 0; | |
f46b5a66 CH |
1408 | int mod = 0; |
1409 | ||
e441d54d CM |
1410 | if (!capable(CAP_SYS_ADMIN)) |
1411 | return -EPERM; | |
1412 | ||
198605a8 MX |
1413 | ret = mnt_want_write_file(file); |
1414 | if (ret) | |
1415 | return ret; | |
1416 | ||
5ac00add SB |
1417 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1418 | 1)) { | |
97547676 | 1419 | mnt_drop_write_file(file); |
e57138b3 | 1420 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
1421 | } |
1422 | ||
5ac00add | 1423 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1424 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1425 | if (IS_ERR(vol_args)) { |
1426 | ret = PTR_ERR(vol_args); | |
1427 | goto out; | |
1428 | } | |
5516e595 MF |
1429 | |
1430 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1431 | |
f46b5a66 CH |
1432 | sizestr = vol_args->name; |
1433 | devstr = strchr(sizestr, ':'); | |
1434 | if (devstr) { | |
1435 | char *end; | |
1436 | sizestr = devstr + 1; | |
1437 | *devstr = '\0'; | |
1438 | devstr = vol_args->name; | |
1439 | devid = simple_strtoull(devstr, &end, 10); | |
dfd79829 MX |
1440 | if (!devid) { |
1441 | ret = -EINVAL; | |
1442 | goto out_free; | |
1443 | } | |
efe120a0 | 1444 | btrfs_info(root->fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1445 | } |
dba60f3f | 1446 | |
aa1b8cd4 | 1447 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1448 | if (!device) { |
efe120a0 | 1449 | btrfs_info(root->fs_info, "resizer unable to find device %llu", |
c1c9ff7c | 1450 | devid); |
dfd79829 | 1451 | ret = -ENODEV; |
c9e9f97b | 1452 | goto out_free; |
f46b5a66 | 1453 | } |
dba60f3f MX |
1454 | |
1455 | if (!device->writeable) { | |
efe120a0 FH |
1456 | btrfs_info(root->fs_info, |
1457 | "resizer unable to apply on readonly device %llu", | |
c1c9ff7c | 1458 | devid); |
dfd79829 | 1459 | ret = -EPERM; |
4e42ae1b LB |
1460 | goto out_free; |
1461 | } | |
1462 | ||
f46b5a66 CH |
1463 | if (!strcmp(sizestr, "max")) |
1464 | new_size = device->bdev->bd_inode->i_size; | |
1465 | else { | |
1466 | if (sizestr[0] == '-') { | |
1467 | mod = -1; | |
1468 | sizestr++; | |
1469 | } else if (sizestr[0] == '+') { | |
1470 | mod = 1; | |
1471 | sizestr++; | |
1472 | } | |
91748467 | 1473 | new_size = memparse(sizestr, NULL); |
f46b5a66 CH |
1474 | if (new_size == 0) { |
1475 | ret = -EINVAL; | |
c9e9f97b | 1476 | goto out_free; |
f46b5a66 CH |
1477 | } |
1478 | } | |
1479 | ||
63a212ab | 1480 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1481 | ret = -EPERM; |
63a212ab SB |
1482 | goto out_free; |
1483 | } | |
1484 | ||
f46b5a66 CH |
1485 | old_size = device->total_bytes; |
1486 | ||
1487 | if (mod < 0) { | |
1488 | if (new_size > old_size) { | |
1489 | ret = -EINVAL; | |
c9e9f97b | 1490 | goto out_free; |
f46b5a66 CH |
1491 | } |
1492 | new_size = old_size - new_size; | |
1493 | } else if (mod > 0) { | |
eb8052e0 WF |
1494 | if (new_size > ULLONG_MAX - old_size) { |
1495 | ret = -EINVAL; | |
1496 | goto out_free; | |
1497 | } | |
f46b5a66 CH |
1498 | new_size = old_size + new_size; |
1499 | } | |
1500 | ||
1501 | if (new_size < 256 * 1024 * 1024) { | |
1502 | ret = -EINVAL; | |
c9e9f97b | 1503 | goto out_free; |
f46b5a66 CH |
1504 | } |
1505 | if (new_size > device->bdev->bd_inode->i_size) { | |
1506 | ret = -EFBIG; | |
c9e9f97b | 1507 | goto out_free; |
f46b5a66 CH |
1508 | } |
1509 | ||
1510 | do_div(new_size, root->sectorsize); | |
1511 | new_size *= root->sectorsize; | |
1512 | ||
efe120a0 | 1513 | printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n", |
c1c9ff7c | 1514 | rcu_str_deref(device->name), new_size); |
f46b5a66 CH |
1515 | |
1516 | if (new_size > old_size) { | |
a22285a6 | 1517 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1518 | if (IS_ERR(trans)) { |
1519 | ret = PTR_ERR(trans); | |
c9e9f97b | 1520 | goto out_free; |
98d5dc13 | 1521 | } |
f46b5a66 CH |
1522 | ret = btrfs_grow_device(trans, device, new_size); |
1523 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1524 | } else if (new_size < old_size) { |
f46b5a66 | 1525 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1526 | } /* equal, nothing need to do */ |
f46b5a66 | 1527 | |
c9e9f97b | 1528 | out_free: |
f46b5a66 | 1529 | kfree(vol_args); |
c9e9f97b ID |
1530 | out: |
1531 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1532 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
18f39c41 | 1533 | mnt_drop_write_file(file); |
f46b5a66 CH |
1534 | return ret; |
1535 | } | |
1536 | ||
72fd032e | 1537 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1538 | char *name, unsigned long fd, int subvol, |
1539 | u64 *transid, bool readonly, | |
8696c533 | 1540 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1541 | { |
f46b5a66 | 1542 | int namelen; |
3de4586c | 1543 | int ret = 0; |
f46b5a66 | 1544 | |
a874a63e LB |
1545 | ret = mnt_want_write_file(file); |
1546 | if (ret) | |
1547 | goto out; | |
1548 | ||
72fd032e SW |
1549 | namelen = strlen(name); |
1550 | if (strchr(name, '/')) { | |
f46b5a66 | 1551 | ret = -EINVAL; |
a874a63e | 1552 | goto out_drop_write; |
f46b5a66 CH |
1553 | } |
1554 | ||
16780cab CM |
1555 | if (name[0] == '.' && |
1556 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1557 | ret = -EEXIST; | |
a874a63e | 1558 | goto out_drop_write; |
16780cab CM |
1559 | } |
1560 | ||
3de4586c | 1561 | if (subvol) { |
72fd032e | 1562 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1563 | NULL, transid, readonly, inherit); |
cb8e7090 | 1564 | } else { |
2903ff01 | 1565 | struct fd src = fdget(fd); |
3de4586c | 1566 | struct inode *src_inode; |
2903ff01 | 1567 | if (!src.file) { |
3de4586c | 1568 | ret = -EINVAL; |
a874a63e | 1569 | goto out_drop_write; |
3de4586c CM |
1570 | } |
1571 | ||
496ad9aa AV |
1572 | src_inode = file_inode(src.file); |
1573 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
efe120a0 FH |
1574 | btrfs_info(BTRFS_I(src_inode)->root->fs_info, |
1575 | "Snapshot src from another FS"); | |
3de4586c | 1576 | ret = -EINVAL; |
d0242061 DS |
1577 | } else if (!inode_owner_or_capable(src_inode)) { |
1578 | /* | |
1579 | * Subvolume creation is not restricted, but snapshots | |
1580 | * are limited to own subvolumes only | |
1581 | */ | |
1582 | ret = -EPERM; | |
ecd18815 AV |
1583 | } else { |
1584 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1585 | BTRFS_I(src_inode)->root, | |
1586 | transid, readonly, inherit); | |
3de4586c | 1587 | } |
2903ff01 | 1588 | fdput(src); |
cb8e7090 | 1589 | } |
a874a63e LB |
1590 | out_drop_write: |
1591 | mnt_drop_write_file(file); | |
f46b5a66 | 1592 | out: |
72fd032e SW |
1593 | return ret; |
1594 | } | |
1595 | ||
1596 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1597 | void __user *arg, int subvol) |
72fd032e | 1598 | { |
fa0d2b9b | 1599 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1600 | int ret; |
1601 | ||
fa0d2b9b LZ |
1602 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1603 | if (IS_ERR(vol_args)) | |
1604 | return PTR_ERR(vol_args); | |
1605 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1606 | |
fa0d2b9b | 1607 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1608 | vol_args->fd, subvol, |
6f72c7e2 | 1609 | NULL, false, NULL); |
fdfb1e4f | 1610 | |
fa0d2b9b LZ |
1611 | kfree(vol_args); |
1612 | return ret; | |
1613 | } | |
fdfb1e4f | 1614 | |
fa0d2b9b LZ |
1615 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1616 | void __user *arg, int subvol) | |
1617 | { | |
1618 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1619 | int ret; | |
1620 | u64 transid = 0; | |
1621 | u64 *ptr = NULL; | |
b83cc969 | 1622 | bool readonly = false; |
6f72c7e2 | 1623 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1624 | |
fa0d2b9b LZ |
1625 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1626 | if (IS_ERR(vol_args)) | |
1627 | return PTR_ERR(vol_args); | |
1628 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1629 | |
b83cc969 | 1630 | if (vol_args->flags & |
6f72c7e2 AJ |
1631 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1632 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1633 | ret = -EOPNOTSUPP; |
fa0d2b9b | 1634 | goto out; |
72fd032e | 1635 | } |
fa0d2b9b LZ |
1636 | |
1637 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1638 | ptr = &transid; | |
b83cc969 LZ |
1639 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1640 | readonly = true; | |
6f72c7e2 AJ |
1641 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1642 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1643 | ret = -EINVAL; | |
1644 | goto out; | |
1645 | } | |
1646 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1647 | if (IS_ERR(inherit)) { | |
1648 | ret = PTR_ERR(inherit); | |
1649 | goto out; | |
1650 | } | |
1651 | } | |
fa0d2b9b LZ |
1652 | |
1653 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1654 | vol_args->fd, subvol, ptr, |
8696c533 | 1655 | readonly, inherit); |
fa0d2b9b LZ |
1656 | |
1657 | if (ret == 0 && ptr && | |
1658 | copy_to_user(arg + | |
1659 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1660 | transid), ptr, sizeof(*ptr))) | |
1661 | ret = -EFAULT; | |
fdfb1e4f | 1662 | out: |
f46b5a66 | 1663 | kfree(vol_args); |
6f72c7e2 | 1664 | kfree(inherit); |
f46b5a66 CH |
1665 | return ret; |
1666 | } | |
1667 | ||
0caa102d LZ |
1668 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1669 | void __user *arg) | |
1670 | { | |
496ad9aa | 1671 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1672 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1673 | int ret = 0; | |
1674 | u64 flags = 0; | |
1675 | ||
33345d01 | 1676 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1677 | return -EINVAL; |
1678 | ||
1679 | down_read(&root->fs_info->subvol_sem); | |
1680 | if (btrfs_root_readonly(root)) | |
1681 | flags |= BTRFS_SUBVOL_RDONLY; | |
1682 | up_read(&root->fs_info->subvol_sem); | |
1683 | ||
1684 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1685 | ret = -EFAULT; | |
1686 | ||
1687 | return ret; | |
1688 | } | |
1689 | ||
1690 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1691 | void __user *arg) | |
1692 | { | |
496ad9aa | 1693 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1694 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1695 | struct btrfs_trans_handle *trans; | |
1696 | u64 root_flags; | |
1697 | u64 flags; | |
1698 | int ret = 0; | |
1699 | ||
b9ca0664 LB |
1700 | ret = mnt_want_write_file(file); |
1701 | if (ret) | |
1702 | goto out; | |
0caa102d | 1703 | |
b9ca0664 LB |
1704 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1705 | ret = -EINVAL; | |
1706 | goto out_drop_write; | |
1707 | } | |
0caa102d | 1708 | |
b9ca0664 LB |
1709 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1710 | ret = -EFAULT; | |
1711 | goto out_drop_write; | |
1712 | } | |
0caa102d | 1713 | |
b9ca0664 LB |
1714 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1715 | ret = -EINVAL; | |
1716 | goto out_drop_write; | |
1717 | } | |
0caa102d | 1718 | |
b9ca0664 LB |
1719 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1720 | ret = -EOPNOTSUPP; | |
1721 | goto out_drop_write; | |
1722 | } | |
0caa102d | 1723 | |
b9ca0664 LB |
1724 | if (!inode_owner_or_capable(inode)) { |
1725 | ret = -EACCES; | |
1726 | goto out_drop_write; | |
1727 | } | |
b4dc2b8c | 1728 | |
0caa102d LZ |
1729 | down_write(&root->fs_info->subvol_sem); |
1730 | ||
1731 | /* nothing to do */ | |
1732 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1733 | goto out_drop_sem; |
0caa102d LZ |
1734 | |
1735 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1736 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1737 | btrfs_set_root_flags(&root->root_item, |
1738 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1739 | } else { |
1740 | /* | |
1741 | * Block RO -> RW transition if this subvolume is involved in | |
1742 | * send | |
1743 | */ | |
1744 | spin_lock(&root->root_item_lock); | |
1745 | if (root->send_in_progress == 0) { | |
1746 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1747 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1748 | spin_unlock(&root->root_item_lock); |
1749 | } else { | |
1750 | spin_unlock(&root->root_item_lock); | |
1751 | btrfs_warn(root->fs_info, | |
1752 | "Attempt to set subvolume %llu read-write during send", | |
1753 | root->root_key.objectid); | |
1754 | ret = -EPERM; | |
1755 | goto out_drop_sem; | |
1756 | } | |
1757 | } | |
0caa102d LZ |
1758 | |
1759 | trans = btrfs_start_transaction(root, 1); | |
1760 | if (IS_ERR(trans)) { | |
1761 | ret = PTR_ERR(trans); | |
1762 | goto out_reset; | |
1763 | } | |
1764 | ||
b4dc2b8c | 1765 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1766 | &root->root_key, &root->root_item); |
1767 | ||
1768 | btrfs_commit_transaction(trans, root); | |
1769 | out_reset: | |
1770 | if (ret) | |
1771 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1772 | out_drop_sem: |
0caa102d | 1773 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1774 | out_drop_write: |
1775 | mnt_drop_write_file(file); | |
1776 | out: | |
0caa102d LZ |
1777 | return ret; |
1778 | } | |
1779 | ||
76dda93c YZ |
1780 | /* |
1781 | * helper to check if the subvolume references other subvolumes | |
1782 | */ | |
1783 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1784 | { | |
1785 | struct btrfs_path *path; | |
175a2b87 | 1786 | struct btrfs_dir_item *di; |
76dda93c | 1787 | struct btrfs_key key; |
175a2b87 | 1788 | u64 dir_id; |
76dda93c YZ |
1789 | int ret; |
1790 | ||
1791 | path = btrfs_alloc_path(); | |
1792 | if (!path) | |
1793 | return -ENOMEM; | |
1794 | ||
175a2b87 JB |
1795 | /* Make sure this root isn't set as the default subvol */ |
1796 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); | |
1797 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, | |
1798 | dir_id, "default", 7, 0); | |
1799 | if (di && !IS_ERR(di)) { | |
1800 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1801 | if (key.objectid == root->root_key.objectid) { | |
1802 | ret = -ENOTEMPTY; | |
1803 | goto out; | |
1804 | } | |
1805 | btrfs_release_path(path); | |
1806 | } | |
1807 | ||
76dda93c YZ |
1808 | key.objectid = root->root_key.objectid; |
1809 | key.type = BTRFS_ROOT_REF_KEY; | |
1810 | key.offset = (u64)-1; | |
1811 | ||
1812 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1813 | &key, path, 0, 0); | |
1814 | if (ret < 0) | |
1815 | goto out; | |
1816 | BUG_ON(ret == 0); | |
1817 | ||
1818 | ret = 0; | |
1819 | if (path->slots[0] > 0) { | |
1820 | path->slots[0]--; | |
1821 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1822 | if (key.objectid == root->root_key.objectid && | |
1823 | key.type == BTRFS_ROOT_REF_KEY) | |
1824 | ret = -ENOTEMPTY; | |
1825 | } | |
1826 | out: | |
1827 | btrfs_free_path(path); | |
1828 | return ret; | |
1829 | } | |
1830 | ||
ac8e9819 CM |
1831 | static noinline int key_in_sk(struct btrfs_key *key, |
1832 | struct btrfs_ioctl_search_key *sk) | |
1833 | { | |
abc6e134 CM |
1834 | struct btrfs_key test; |
1835 | int ret; | |
1836 | ||
1837 | test.objectid = sk->min_objectid; | |
1838 | test.type = sk->min_type; | |
1839 | test.offset = sk->min_offset; | |
1840 | ||
1841 | ret = btrfs_comp_cpu_keys(key, &test); | |
1842 | if (ret < 0) | |
ac8e9819 | 1843 | return 0; |
abc6e134 CM |
1844 | |
1845 | test.objectid = sk->max_objectid; | |
1846 | test.type = sk->max_type; | |
1847 | test.offset = sk->max_offset; | |
1848 | ||
1849 | ret = btrfs_comp_cpu_keys(key, &test); | |
1850 | if (ret > 0) | |
ac8e9819 CM |
1851 | return 0; |
1852 | return 1; | |
1853 | } | |
1854 | ||
1855 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1856 | struct btrfs_path *path, | |
1857 | struct btrfs_key *key, | |
1858 | struct btrfs_ioctl_search_key *sk, | |
1859 | char *buf, | |
1860 | unsigned long *sk_offset, | |
1861 | int *num_found) | |
1862 | { | |
1863 | u64 found_transid; | |
1864 | struct extent_buffer *leaf; | |
1865 | struct btrfs_ioctl_search_header sh; | |
1866 | unsigned long item_off; | |
1867 | unsigned long item_len; | |
1868 | int nritems; | |
1869 | int i; | |
1870 | int slot; | |
ac8e9819 CM |
1871 | int ret = 0; |
1872 | ||
1873 | leaf = path->nodes[0]; | |
1874 | slot = path->slots[0]; | |
1875 | nritems = btrfs_header_nritems(leaf); | |
1876 | ||
1877 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1878 | i = nritems; | |
1879 | goto advance_key; | |
1880 | } | |
1881 | found_transid = btrfs_header_generation(leaf); | |
1882 | ||
1883 | for (i = slot; i < nritems; i++) { | |
1884 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1885 | item_len = btrfs_item_size_nr(leaf, i); | |
1886 | ||
03b71c6c GP |
1887 | btrfs_item_key_to_cpu(leaf, key, i); |
1888 | if (!key_in_sk(key, sk)) | |
1889 | continue; | |
1890 | ||
1891 | if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE) | |
ac8e9819 CM |
1892 | item_len = 0; |
1893 | ||
1894 | if (sizeof(sh) + item_len + *sk_offset > | |
1895 | BTRFS_SEARCH_ARGS_BUFSIZE) { | |
1896 | ret = 1; | |
1897 | goto overflow; | |
1898 | } | |
1899 | ||
ac8e9819 CM |
1900 | sh.objectid = key->objectid; |
1901 | sh.offset = key->offset; | |
1902 | sh.type = key->type; | |
1903 | sh.len = item_len; | |
1904 | sh.transid = found_transid; | |
1905 | ||
1906 | /* copy search result header */ | |
1907 | memcpy(buf + *sk_offset, &sh, sizeof(sh)); | |
1908 | *sk_offset += sizeof(sh); | |
1909 | ||
1910 | if (item_len) { | |
1911 | char *p = buf + *sk_offset; | |
1912 | /* copy the item */ | |
1913 | read_extent_buffer(leaf, p, | |
1914 | item_off, item_len); | |
1915 | *sk_offset += item_len; | |
ac8e9819 | 1916 | } |
e2156867 | 1917 | (*num_found)++; |
ac8e9819 CM |
1918 | |
1919 | if (*num_found >= sk->nr_items) | |
1920 | break; | |
1921 | } | |
1922 | advance_key: | |
abc6e134 CM |
1923 | ret = 0; |
1924 | if (key->offset < (u64)-1 && key->offset < sk->max_offset) | |
ac8e9819 | 1925 | key->offset++; |
abc6e134 CM |
1926 | else if (key->type < (u8)-1 && key->type < sk->max_type) { |
1927 | key->offset = 0; | |
ac8e9819 | 1928 | key->type++; |
abc6e134 CM |
1929 | } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { |
1930 | key->offset = 0; | |
1931 | key->type = 0; | |
ac8e9819 | 1932 | key->objectid++; |
abc6e134 CM |
1933 | } else |
1934 | ret = 1; | |
ac8e9819 | 1935 | overflow: |
ac8e9819 CM |
1936 | return ret; |
1937 | } | |
1938 | ||
1939 | static noinline int search_ioctl(struct inode *inode, | |
1940 | struct btrfs_ioctl_search_args *args) | |
1941 | { | |
1942 | struct btrfs_root *root; | |
1943 | struct btrfs_key key; | |
ac8e9819 CM |
1944 | struct btrfs_path *path; |
1945 | struct btrfs_ioctl_search_key *sk = &args->key; | |
1946 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; | |
1947 | int ret; | |
1948 | int num_found = 0; | |
1949 | unsigned long sk_offset = 0; | |
1950 | ||
1951 | path = btrfs_alloc_path(); | |
1952 | if (!path) | |
1953 | return -ENOMEM; | |
1954 | ||
1955 | if (sk->tree_id == 0) { | |
1956 | /* search the root of the inode that was passed */ | |
1957 | root = BTRFS_I(inode)->root; | |
1958 | } else { | |
1959 | key.objectid = sk->tree_id; | |
1960 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1961 | key.offset = (u64)-1; | |
1962 | root = btrfs_read_fs_root_no_name(info, &key); | |
1963 | if (IS_ERR(root)) { | |
efe120a0 | 1964 | printk(KERN_ERR "BTRFS: could not find root %llu\n", |
ac8e9819 CM |
1965 | sk->tree_id); |
1966 | btrfs_free_path(path); | |
1967 | return -ENOENT; | |
1968 | } | |
1969 | } | |
1970 | ||
1971 | key.objectid = sk->min_objectid; | |
1972 | key.type = sk->min_type; | |
1973 | key.offset = sk->min_offset; | |
1974 | ||
ac8e9819 CM |
1975 | path->keep_locks = 1; |
1976 | ||
67871254 | 1977 | while (1) { |
6174d3cb | 1978 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
1979 | if (ret != 0) { |
1980 | if (ret > 0) | |
1981 | ret = 0; | |
1982 | goto err; | |
1983 | } | |
1984 | ret = copy_to_sk(root, path, &key, sk, args->buf, | |
1985 | &sk_offset, &num_found); | |
b3b4aa74 | 1986 | btrfs_release_path(path); |
ac8e9819 CM |
1987 | if (ret || num_found >= sk->nr_items) |
1988 | break; | |
1989 | ||
1990 | } | |
1991 | ret = 0; | |
1992 | err: | |
1993 | sk->nr_items = num_found; | |
1994 | btrfs_free_path(path); | |
1995 | return ret; | |
1996 | } | |
1997 | ||
1998 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
1999 | void __user *argp) | |
2000 | { | |
2001 | struct btrfs_ioctl_search_args *args; | |
2002 | struct inode *inode; | |
2003 | int ret; | |
2004 | ||
2005 | if (!capable(CAP_SYS_ADMIN)) | |
2006 | return -EPERM; | |
2007 | ||
2354d08f JL |
2008 | args = memdup_user(argp, sizeof(*args)); |
2009 | if (IS_ERR(args)) | |
2010 | return PTR_ERR(args); | |
ac8e9819 | 2011 | |
496ad9aa | 2012 | inode = file_inode(file); |
ac8e9819 CM |
2013 | ret = search_ioctl(inode, args); |
2014 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2015 | ret = -EFAULT; | |
2016 | kfree(args); | |
2017 | return ret; | |
2018 | } | |
2019 | ||
98d377a0 | 2020 | /* |
ac8e9819 CM |
2021 | * Search INODE_REFs to identify path name of 'dirid' directory |
2022 | * in a 'tree_id' tree. and sets path name to 'name'. | |
2023 | */ | |
98d377a0 TH |
2024 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
2025 | u64 tree_id, u64 dirid, char *name) | |
2026 | { | |
2027 | struct btrfs_root *root; | |
2028 | struct btrfs_key key; | |
ac8e9819 | 2029 | char *ptr; |
98d377a0 TH |
2030 | int ret = -1; |
2031 | int slot; | |
2032 | int len; | |
2033 | int total_len = 0; | |
2034 | struct btrfs_inode_ref *iref; | |
2035 | struct extent_buffer *l; | |
2036 | struct btrfs_path *path; | |
2037 | ||
2038 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
2039 | name[0]='\0'; | |
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | path = btrfs_alloc_path(); | |
2044 | if (!path) | |
2045 | return -ENOMEM; | |
2046 | ||
ac8e9819 | 2047 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
2048 | |
2049 | key.objectid = tree_id; | |
2050 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2051 | key.offset = (u64)-1; | |
2052 | root = btrfs_read_fs_root_no_name(info, &key); | |
2053 | if (IS_ERR(root)) { | |
efe120a0 | 2054 | printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id); |
8ad6fcab CM |
2055 | ret = -ENOENT; |
2056 | goto out; | |
98d377a0 TH |
2057 | } |
2058 | ||
2059 | key.objectid = dirid; | |
2060 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2061 | key.offset = (u64)-1; |
98d377a0 | 2062 | |
67871254 | 2063 | while (1) { |
98d377a0 TH |
2064 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2065 | if (ret < 0) | |
2066 | goto out; | |
18674c6c FDBM |
2067 | else if (ret > 0) { |
2068 | ret = btrfs_previous_item(root, path, dirid, | |
2069 | BTRFS_INODE_REF_KEY); | |
2070 | if (ret < 0) | |
2071 | goto out; | |
2072 | else if (ret > 0) { | |
2073 | ret = -ENOENT; | |
2074 | goto out; | |
2075 | } | |
2076 | } | |
98d377a0 TH |
2077 | |
2078 | l = path->nodes[0]; | |
2079 | slot = path->slots[0]; | |
2080 | btrfs_item_key_to_cpu(l, &key, slot); | |
2081 | ||
98d377a0 TH |
2082 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2083 | len = btrfs_inode_ref_name_len(l, iref); | |
2084 | ptr -= len + 1; | |
2085 | total_len += len + 1; | |
a696cf35 FDBM |
2086 | if (ptr < name) { |
2087 | ret = -ENAMETOOLONG; | |
98d377a0 | 2088 | goto out; |
a696cf35 | 2089 | } |
98d377a0 TH |
2090 | |
2091 | *(ptr + len) = '/'; | |
67871254 | 2092 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2093 | |
2094 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2095 | break; | |
2096 | ||
b3b4aa74 | 2097 | btrfs_release_path(path); |
98d377a0 | 2098 | key.objectid = key.offset; |
8ad6fcab | 2099 | key.offset = (u64)-1; |
98d377a0 | 2100 | dirid = key.objectid; |
98d377a0 | 2101 | } |
77906a50 | 2102 | memmove(name, ptr, total_len); |
67871254 | 2103 | name[total_len] = '\0'; |
98d377a0 TH |
2104 | ret = 0; |
2105 | out: | |
2106 | btrfs_free_path(path); | |
ac8e9819 CM |
2107 | return ret; |
2108 | } | |
2109 | ||
2110 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2111 | void __user *argp) | |
2112 | { | |
2113 | struct btrfs_ioctl_ino_lookup_args *args; | |
2114 | struct inode *inode; | |
2115 | int ret; | |
2116 | ||
2117 | if (!capable(CAP_SYS_ADMIN)) | |
2118 | return -EPERM; | |
2119 | ||
2354d08f JL |
2120 | args = memdup_user(argp, sizeof(*args)); |
2121 | if (IS_ERR(args)) | |
2122 | return PTR_ERR(args); | |
c2b96929 | 2123 | |
496ad9aa | 2124 | inode = file_inode(file); |
ac8e9819 | 2125 | |
1b53ac4d CM |
2126 | if (args->treeid == 0) |
2127 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2128 | ||
ac8e9819 CM |
2129 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2130 | args->treeid, args->objectid, | |
2131 | args->name); | |
2132 | ||
2133 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) | |
2134 | ret = -EFAULT; | |
2135 | ||
2136 | kfree(args); | |
98d377a0 TH |
2137 | return ret; |
2138 | } | |
2139 | ||
76dda93c YZ |
2140 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2141 | void __user *arg) | |
2142 | { | |
54563d41 | 2143 | struct dentry *parent = file->f_path.dentry; |
76dda93c YZ |
2144 | struct dentry *dentry; |
2145 | struct inode *dir = parent->d_inode; | |
2146 | struct inode *inode; | |
2147 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2148 | struct btrfs_root *dest = NULL; | |
2149 | struct btrfs_ioctl_vol_args *vol_args; | |
2150 | struct btrfs_trans_handle *trans; | |
c58aaad2 MX |
2151 | struct btrfs_block_rsv block_rsv; |
2152 | u64 qgroup_reserved; | |
76dda93c YZ |
2153 | int namelen; |
2154 | int ret; | |
2155 | int err = 0; | |
2156 | ||
76dda93c YZ |
2157 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2158 | if (IS_ERR(vol_args)) | |
2159 | return PTR_ERR(vol_args); | |
2160 | ||
2161 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2162 | namelen = strlen(vol_args->name); | |
2163 | if (strchr(vol_args->name, '/') || | |
2164 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2165 | err = -EINVAL; | |
2166 | goto out; | |
2167 | } | |
2168 | ||
a561be71 | 2169 | err = mnt_want_write_file(file); |
76dda93c YZ |
2170 | if (err) |
2171 | goto out; | |
2172 | ||
5c50c9b8 DS |
2173 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
2174 | if (err == -EINTR) | |
e43f998e | 2175 | goto out_drop_write; |
76dda93c YZ |
2176 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2177 | if (IS_ERR(dentry)) { | |
2178 | err = PTR_ERR(dentry); | |
2179 | goto out_unlock_dir; | |
2180 | } | |
2181 | ||
2182 | if (!dentry->d_inode) { | |
2183 | err = -ENOENT; | |
2184 | goto out_dput; | |
2185 | } | |
2186 | ||
2187 | inode = dentry->d_inode; | |
4260f7c7 | 2188 | dest = BTRFS_I(inode)->root; |
67871254 | 2189 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2190 | /* |
2191 | * Regular user. Only allow this with a special mount | |
2192 | * option, when the user has write+exec access to the | |
2193 | * subvol root, and when rmdir(2) would have been | |
2194 | * allowed. | |
2195 | * | |
2196 | * Note that this is _not_ check that the subvol is | |
2197 | * empty or doesn't contain data that we wouldn't | |
2198 | * otherwise be able to delete. | |
2199 | * | |
2200 | * Users who want to delete empty subvols should try | |
2201 | * rmdir(2). | |
2202 | */ | |
2203 | err = -EPERM; | |
2204 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2205 | goto out_dput; | |
2206 | ||
2207 | /* | |
2208 | * Do not allow deletion if the parent dir is the same | |
2209 | * as the dir to be deleted. That means the ioctl | |
2210 | * must be called on the dentry referencing the root | |
2211 | * of the subvol, not a random directory contained | |
2212 | * within it. | |
2213 | */ | |
2214 | err = -EINVAL; | |
2215 | if (root == dest) | |
2216 | goto out_dput; | |
2217 | ||
2218 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2219 | if (err) | |
2220 | goto out_dput; | |
4260f7c7 SW |
2221 | } |
2222 | ||
5c39da5b MX |
2223 | /* check if subvolume may be deleted by a user */ |
2224 | err = btrfs_may_delete(dir, dentry, 1); | |
2225 | if (err) | |
2226 | goto out_dput; | |
2227 | ||
33345d01 | 2228 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2229 | err = -EINVAL; |
2230 | goto out_dput; | |
2231 | } | |
2232 | ||
76dda93c YZ |
2233 | mutex_lock(&inode->i_mutex); |
2234 | err = d_invalidate(dentry); | |
2235 | if (err) | |
2236 | goto out_unlock; | |
2237 | ||
2238 | down_write(&root->fs_info->subvol_sem); | |
2239 | ||
2240 | err = may_destroy_subvol(dest); | |
2241 | if (err) | |
2242 | goto out_up_write; | |
2243 | ||
c58aaad2 MX |
2244 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2245 | /* | |
2246 | * One for dir inode, two for dir entries, two for root | |
2247 | * ref/backref. | |
2248 | */ | |
2249 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2250 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2251 | if (err) |
2252 | goto out_up_write; | |
2253 | ||
a22285a6 YZ |
2254 | trans = btrfs_start_transaction(root, 0); |
2255 | if (IS_ERR(trans)) { | |
2256 | err = PTR_ERR(trans); | |
c58aaad2 | 2257 | goto out_release; |
a22285a6 | 2258 | } |
c58aaad2 MX |
2259 | trans->block_rsv = &block_rsv; |
2260 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2261 | |
76dda93c YZ |
2262 | ret = btrfs_unlink_subvol(trans, root, dir, |
2263 | dest->root_key.objectid, | |
2264 | dentry->d_name.name, | |
2265 | dentry->d_name.len); | |
79787eaa JM |
2266 | if (ret) { |
2267 | err = ret; | |
2268 | btrfs_abort_transaction(trans, root, ret); | |
2269 | goto out_end_trans; | |
2270 | } | |
76dda93c YZ |
2271 | |
2272 | btrfs_record_root_in_trans(trans, dest); | |
2273 | ||
2274 | memset(&dest->root_item.drop_progress, 0, | |
2275 | sizeof(dest->root_item.drop_progress)); | |
2276 | dest->root_item.drop_level = 0; | |
2277 | btrfs_set_root_refs(&dest->root_item, 0); | |
2278 | ||
d68fc57b YZ |
2279 | if (!xchg(&dest->orphan_item_inserted, 1)) { |
2280 | ret = btrfs_insert_orphan_item(trans, | |
2281 | root->fs_info->tree_root, | |
2282 | dest->root_key.objectid); | |
79787eaa JM |
2283 | if (ret) { |
2284 | btrfs_abort_transaction(trans, root, ret); | |
2285 | err = ret; | |
2286 | goto out_end_trans; | |
2287 | } | |
d68fc57b | 2288 | } |
dd5f9615 SB |
2289 | |
2290 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2291 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
2292 | dest->root_key.objectid); | |
2293 | if (ret && ret != -ENOENT) { | |
2294 | btrfs_abort_transaction(trans, root, ret); | |
2295 | err = ret; | |
2296 | goto out_end_trans; | |
2297 | } | |
2298 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { | |
2299 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2300 | dest->root_item.received_uuid, | |
2301 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
2302 | dest->root_key.objectid); | |
2303 | if (ret && ret != -ENOENT) { | |
2304 | btrfs_abort_transaction(trans, root, ret); | |
2305 | err = ret; | |
2306 | goto out_end_trans; | |
2307 | } | |
2308 | } | |
2309 | ||
79787eaa | 2310 | out_end_trans: |
c58aaad2 MX |
2311 | trans->block_rsv = NULL; |
2312 | trans->bytes_reserved = 0; | |
531cb13f | 2313 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2314 | if (ret && !err) |
2315 | err = ret; | |
76dda93c | 2316 | inode->i_flags |= S_DEAD; |
c58aaad2 MX |
2317 | out_release: |
2318 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
76dda93c YZ |
2319 | out_up_write: |
2320 | up_write(&root->fs_info->subvol_sem); | |
2321 | out_unlock: | |
2322 | mutex_unlock(&inode->i_mutex); | |
2323 | if (!err) { | |
efefb143 | 2324 | shrink_dcache_sb(root->fs_info->sb); |
76dda93c YZ |
2325 | btrfs_invalidate_inodes(dest); |
2326 | d_delete(dentry); | |
fa6ac876 LB |
2327 | |
2328 | /* the last ref */ | |
2329 | if (dest->cache_inode) { | |
2330 | iput(dest->cache_inode); | |
2331 | dest->cache_inode = NULL; | |
2332 | } | |
76dda93c YZ |
2333 | } |
2334 | out_dput: | |
2335 | dput(dentry); | |
2336 | out_unlock_dir: | |
2337 | mutex_unlock(&dir->i_mutex); | |
e43f998e | 2338 | out_drop_write: |
2a79f17e | 2339 | mnt_drop_write_file(file); |
76dda93c YZ |
2340 | out: |
2341 | kfree(vol_args); | |
2342 | return err; | |
2343 | } | |
2344 | ||
1e701a32 | 2345 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2346 | { |
496ad9aa | 2347 | struct inode *inode = file_inode(file); |
f46b5a66 | 2348 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2349 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2350 | int ret; |
2351 | ||
25122d15 ID |
2352 | ret = mnt_want_write_file(file); |
2353 | if (ret) | |
2354 | return ret; | |
b83cc969 | 2355 | |
25122d15 ID |
2356 | if (btrfs_root_readonly(root)) { |
2357 | ret = -EROFS; | |
2358 | goto out; | |
5ac00add | 2359 | } |
f46b5a66 CH |
2360 | |
2361 | switch (inode->i_mode & S_IFMT) { | |
2362 | case S_IFDIR: | |
e441d54d CM |
2363 | if (!capable(CAP_SYS_ADMIN)) { |
2364 | ret = -EPERM; | |
2365 | goto out; | |
2366 | } | |
de78b51a | 2367 | ret = btrfs_defrag_root(root); |
8929ecfa YZ |
2368 | if (ret) |
2369 | goto out; | |
de78b51a | 2370 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
f46b5a66 CH |
2371 | break; |
2372 | case S_IFREG: | |
e441d54d CM |
2373 | if (!(file->f_mode & FMODE_WRITE)) { |
2374 | ret = -EINVAL; | |
2375 | goto out; | |
2376 | } | |
1e701a32 CM |
2377 | |
2378 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2379 | if (!range) { | |
2380 | ret = -ENOMEM; | |
2381 | goto out; | |
2382 | } | |
2383 | ||
2384 | if (argp) { | |
2385 | if (copy_from_user(range, argp, | |
2386 | sizeof(*range))) { | |
2387 | ret = -EFAULT; | |
2388 | kfree(range); | |
683be16e | 2389 | goto out; |
1e701a32 CM |
2390 | } |
2391 | /* compression requires us to start the IO */ | |
2392 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2393 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2394 | range->extent_thresh = (u32)-1; | |
2395 | } | |
2396 | } else { | |
2397 | /* the rest are all set to zero by kzalloc */ | |
2398 | range->len = (u64)-1; | |
2399 | } | |
496ad9aa | 2400 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2401 | range, 0, 0); |
2402 | if (ret > 0) | |
2403 | ret = 0; | |
1e701a32 | 2404 | kfree(range); |
f46b5a66 | 2405 | break; |
8929ecfa YZ |
2406 | default: |
2407 | ret = -EINVAL; | |
f46b5a66 | 2408 | } |
e441d54d | 2409 | out: |
25122d15 | 2410 | mnt_drop_write_file(file); |
e441d54d | 2411 | return ret; |
f46b5a66 CH |
2412 | } |
2413 | ||
b2950863 | 2414 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2415 | { |
2416 | struct btrfs_ioctl_vol_args *vol_args; | |
2417 | int ret; | |
2418 | ||
e441d54d CM |
2419 | if (!capable(CAP_SYS_ADMIN)) |
2420 | return -EPERM; | |
2421 | ||
5ac00add SB |
2422 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2423 | 1)) { | |
e57138b3 | 2424 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
2425 | } |
2426 | ||
5ac00add | 2427 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2428 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2429 | if (IS_ERR(vol_args)) { |
2430 | ret = PTR_ERR(vol_args); | |
2431 | goto out; | |
2432 | } | |
f46b5a66 | 2433 | |
5516e595 | 2434 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2435 | ret = btrfs_init_new_device(root, vol_args->name); |
2436 | ||
f46b5a66 | 2437 | kfree(vol_args); |
c9e9f97b ID |
2438 | out: |
2439 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2440 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2441 | return ret; |
2442 | } | |
2443 | ||
da24927b | 2444 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2445 | { |
496ad9aa | 2446 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
2447 | struct btrfs_ioctl_vol_args *vol_args; |
2448 | int ret; | |
2449 | ||
e441d54d CM |
2450 | if (!capable(CAP_SYS_ADMIN)) |
2451 | return -EPERM; | |
2452 | ||
da24927b MX |
2453 | ret = mnt_want_write_file(file); |
2454 | if (ret) | |
2455 | return ret; | |
c146afad | 2456 | |
dae7b665 | 2457 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2458 | if (IS_ERR(vol_args)) { |
2459 | ret = PTR_ERR(vol_args); | |
2460 | goto out; | |
2461 | } | |
f46b5a66 | 2462 | |
5516e595 | 2463 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 2464 | |
183860f6 AJ |
2465 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2466 | 1)) { | |
2467 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2468 | goto out; | |
2469 | } | |
2470 | ||
2471 | mutex_lock(&root->fs_info->volume_mutex); | |
2472 | ret = btrfs_rm_device(root, vol_args->name); | |
c9e9f97b | 2473 | mutex_unlock(&root->fs_info->volume_mutex); |
5ac00add | 2474 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
183860f6 AJ |
2475 | |
2476 | out: | |
2477 | kfree(vol_args); | |
4ac20c70 | 2478 | mnt_drop_write_file(file); |
f46b5a66 CH |
2479 | return ret; |
2480 | } | |
2481 | ||
475f6387 JS |
2482 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2483 | { | |
027ed2f0 | 2484 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 JS |
2485 | struct btrfs_device *device; |
2486 | struct btrfs_device *next; | |
2487 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
027ed2f0 | 2488 | int ret = 0; |
475f6387 JS |
2489 | |
2490 | if (!capable(CAP_SYS_ADMIN)) | |
2491 | return -EPERM; | |
2492 | ||
027ed2f0 LZ |
2493 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2494 | if (!fi_args) | |
2495 | return -ENOMEM; | |
2496 | ||
f7171750 | 2497 | mutex_lock(&fs_devices->device_list_mutex); |
027ed2f0 LZ |
2498 | fi_args->num_devices = fs_devices->num_devices; |
2499 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 | 2500 | |
475f6387 | 2501 | list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2502 | if (device->devid > fi_args->max_id) |
2503 | fi_args->max_id = device->devid; | |
475f6387 JS |
2504 | } |
2505 | mutex_unlock(&fs_devices->device_list_mutex); | |
2506 | ||
027ed2f0 LZ |
2507 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2508 | ret = -EFAULT; | |
475f6387 | 2509 | |
027ed2f0 LZ |
2510 | kfree(fi_args); |
2511 | return ret; | |
475f6387 JS |
2512 | } |
2513 | ||
2514 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2515 | { | |
2516 | struct btrfs_ioctl_dev_info_args *di_args; | |
2517 | struct btrfs_device *dev; | |
2518 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2519 | int ret = 0; | |
2520 | char *s_uuid = NULL; | |
475f6387 JS |
2521 | |
2522 | if (!capable(CAP_SYS_ADMIN)) | |
2523 | return -EPERM; | |
2524 | ||
2525 | di_args = memdup_user(arg, sizeof(*di_args)); | |
2526 | if (IS_ERR(di_args)) | |
2527 | return PTR_ERR(di_args); | |
2528 | ||
dd5f9615 | 2529 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
475f6387 JS |
2530 | s_uuid = di_args->uuid; |
2531 | ||
2532 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2533 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2534 | |
2535 | if (!dev) { | |
2536 | ret = -ENODEV; | |
2537 | goto out; | |
2538 | } | |
2539 | ||
2540 | di_args->devid = dev->devid; | |
2541 | di_args->bytes_used = dev->bytes_used; | |
2542 | di_args->total_bytes = dev->total_bytes; | |
2543 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); | |
a27202fb | 2544 | if (dev->name) { |
606686ee JB |
2545 | struct rcu_string *name; |
2546 | ||
2547 | rcu_read_lock(); | |
2548 | name = rcu_dereference(dev->name); | |
2549 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2550 | rcu_read_unlock(); | |
a27202fb JM |
2551 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2552 | } else { | |
99ba55ad | 2553 | di_args->path[0] = '\0'; |
a27202fb | 2554 | } |
475f6387 JS |
2555 | |
2556 | out: | |
55793c0d | 2557 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2558 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2559 | ret = -EFAULT; | |
2560 | ||
2561 | kfree(di_args); | |
2562 | return ret; | |
2563 | } | |
2564 | ||
416161db MF |
2565 | static struct page *extent_same_get_page(struct inode *inode, u64 off) |
2566 | { | |
2567 | struct page *page; | |
2568 | pgoff_t index; | |
2569 | struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; | |
2570 | ||
2571 | index = off >> PAGE_CACHE_SHIFT; | |
2572 | ||
2573 | page = grab_cache_page(inode->i_mapping, index); | |
2574 | if (!page) | |
2575 | return NULL; | |
2576 | ||
2577 | if (!PageUptodate(page)) { | |
2578 | if (extent_read_full_page_nolock(tree, page, btrfs_get_extent, | |
2579 | 0)) | |
2580 | return NULL; | |
2581 | lock_page(page); | |
2582 | if (!PageUptodate(page)) { | |
2583 | unlock_page(page); | |
2584 | page_cache_release(page); | |
2585 | return NULL; | |
2586 | } | |
2587 | } | |
2588 | unlock_page(page); | |
2589 | ||
2590 | return page; | |
2591 | } | |
2592 | ||
77fe20dc MF |
2593 | static inline void lock_extent_range(struct inode *inode, u64 off, u64 len) |
2594 | { | |
2595 | /* do any pending delalloc/csum calc on src, one way or | |
2596 | another, and lock file content */ | |
2597 | while (1) { | |
2598 | struct btrfs_ordered_extent *ordered; | |
2599 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2600 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
2601 | off + len - 1); | |
2602 | if (!ordered && | |
2603 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, | |
2604 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) | |
2605 | break; | |
2606 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2607 | if (ordered) | |
2608 | btrfs_put_ordered_extent(ordered); | |
2609 | btrfs_wait_ordered_range(inode, off, len); | |
2610 | } | |
2611 | } | |
2612 | ||
416161db MF |
2613 | static void btrfs_double_unlock(struct inode *inode1, u64 loff1, |
2614 | struct inode *inode2, u64 loff2, u64 len) | |
2615 | { | |
2616 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); | |
2617 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); | |
2618 | ||
2619 | mutex_unlock(&inode1->i_mutex); | |
2620 | mutex_unlock(&inode2->i_mutex); | |
2621 | } | |
2622 | ||
2623 | static void btrfs_double_lock(struct inode *inode1, u64 loff1, | |
2624 | struct inode *inode2, u64 loff2, u64 len) | |
2625 | { | |
2626 | if (inode1 < inode2) { | |
2627 | swap(inode1, inode2); | |
2628 | swap(loff1, loff2); | |
2629 | } | |
2630 | ||
2631 | mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); | |
2632 | lock_extent_range(inode1, loff1, len); | |
2633 | if (inode1 != inode2) { | |
2634 | mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); | |
2635 | lock_extent_range(inode2, loff2, len); | |
2636 | } | |
2637 | } | |
2638 | ||
2639 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, | |
2640 | u64 dst_loff, u64 len) | |
2641 | { | |
2642 | int ret = 0; | |
2643 | struct page *src_page, *dst_page; | |
2644 | unsigned int cmp_len = PAGE_CACHE_SIZE; | |
2645 | void *addr, *dst_addr; | |
2646 | ||
2647 | while (len) { | |
2648 | if (len < PAGE_CACHE_SIZE) | |
2649 | cmp_len = len; | |
2650 | ||
2651 | src_page = extent_same_get_page(src, loff); | |
2652 | if (!src_page) | |
2653 | return -EINVAL; | |
2654 | dst_page = extent_same_get_page(dst, dst_loff); | |
2655 | if (!dst_page) { | |
2656 | page_cache_release(src_page); | |
2657 | return -EINVAL; | |
2658 | } | |
2659 | addr = kmap_atomic(src_page); | |
2660 | dst_addr = kmap_atomic(dst_page); | |
2661 | ||
2662 | flush_dcache_page(src_page); | |
2663 | flush_dcache_page(dst_page); | |
2664 | ||
2665 | if (memcmp(addr, dst_addr, cmp_len)) | |
2666 | ret = BTRFS_SAME_DATA_DIFFERS; | |
2667 | ||
2668 | kunmap_atomic(addr); | |
2669 | kunmap_atomic(dst_addr); | |
2670 | page_cache_release(src_page); | |
2671 | page_cache_release(dst_page); | |
2672 | ||
2673 | if (ret) | |
2674 | break; | |
2675 | ||
2676 | loff += cmp_len; | |
2677 | dst_loff += cmp_len; | |
2678 | len -= cmp_len; | |
2679 | } | |
2680 | ||
2681 | return ret; | |
2682 | } | |
2683 | ||
2684 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len) | |
2685 | { | |
2686 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; | |
2687 | ||
2688 | if (off + len > inode->i_size || off + len < off) | |
2689 | return -EINVAL; | |
2690 | /* Check that we are block aligned - btrfs_clone() requires this */ | |
2691 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) | |
2692 | return -EINVAL; | |
2693 | ||
2694 | return 0; | |
2695 | } | |
2696 | ||
2697 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 len, | |
2698 | struct inode *dst, u64 dst_loff) | |
2699 | { | |
2700 | int ret; | |
2701 | ||
2702 | /* | |
2703 | * btrfs_clone() can't handle extents in the same file | |
2704 | * yet. Once that works, we can drop this check and replace it | |
2705 | * with a check for the same inode, but overlapping extents. | |
2706 | */ | |
2707 | if (src == dst) | |
2708 | return -EINVAL; | |
2709 | ||
2710 | btrfs_double_lock(src, loff, dst, dst_loff, len); | |
2711 | ||
2712 | ret = extent_same_check_offsets(src, loff, len); | |
2713 | if (ret) | |
2714 | goto out_unlock; | |
2715 | ||
2716 | ret = extent_same_check_offsets(dst, dst_loff, len); | |
2717 | if (ret) | |
2718 | goto out_unlock; | |
2719 | ||
2720 | /* don't make the dst file partly checksummed */ | |
2721 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
2722 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { | |
2723 | ret = -EINVAL; | |
2724 | goto out_unlock; | |
2725 | } | |
2726 | ||
2727 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); | |
2728 | if (ret == 0) | |
2729 | ret = btrfs_clone(src, dst, loff, len, len, dst_loff); | |
2730 | ||
2731 | out_unlock: | |
2732 | btrfs_double_unlock(src, loff, dst, dst_loff, len); | |
2733 | ||
2734 | return ret; | |
2735 | } | |
2736 | ||
2737 | #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024) | |
2738 | ||
2739 | static long btrfs_ioctl_file_extent_same(struct file *file, | |
2740 | void __user *argp) | |
2741 | { | |
cbf8b8ca MF |
2742 | struct btrfs_ioctl_same_args tmp; |
2743 | struct btrfs_ioctl_same_args *same; | |
2744 | struct btrfs_ioctl_same_extent_info *info; | |
416161db MF |
2745 | struct inode *src = file->f_dentry->d_inode; |
2746 | struct file *dst_file = NULL; | |
2747 | struct inode *dst; | |
2748 | u64 off; | |
2749 | u64 len; | |
2750 | int i; | |
2751 | int ret; | |
cbf8b8ca | 2752 | unsigned long size; |
416161db MF |
2753 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
2754 | bool is_admin = capable(CAP_SYS_ADMIN); | |
2755 | ||
2756 | if (!(file->f_mode & FMODE_READ)) | |
2757 | return -EINVAL; | |
2758 | ||
2759 | ret = mnt_want_write_file(file); | |
2760 | if (ret) | |
2761 | return ret; | |
2762 | ||
cbf8b8ca | 2763 | if (copy_from_user(&tmp, |
416161db | 2764 | (struct btrfs_ioctl_same_args __user *)argp, |
cbf8b8ca | 2765 | sizeof(tmp))) { |
416161db MF |
2766 | ret = -EFAULT; |
2767 | goto out; | |
2768 | } | |
2769 | ||
cbf8b8ca MF |
2770 | size = sizeof(tmp) + |
2771 | tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info); | |
2772 | ||
229eed43 | 2773 | same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size); |
cbf8b8ca | 2774 | |
229eed43 GB |
2775 | if (IS_ERR(same)) { |
2776 | ret = PTR_ERR(same); | |
cbf8b8ca MF |
2777 | goto out; |
2778 | } | |
2779 | ||
2780 | off = same->logical_offset; | |
2781 | len = same->length; | |
416161db MF |
2782 | |
2783 | /* | |
2784 | * Limit the total length we will dedupe for each operation. | |
2785 | * This is intended to bound the total time spent in this | |
2786 | * ioctl to something sane. | |
2787 | */ | |
2788 | if (len > BTRFS_MAX_DEDUPE_LEN) | |
2789 | len = BTRFS_MAX_DEDUPE_LEN; | |
2790 | ||
2791 | if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { | |
2792 | /* | |
2793 | * Btrfs does not support blocksize < page_size. As a | |
2794 | * result, btrfs_cmp_data() won't correctly handle | |
2795 | * this situation without an update. | |
2796 | */ | |
2797 | ret = -EINVAL; | |
2798 | goto out; | |
2799 | } | |
2800 | ||
2801 | ret = -EISDIR; | |
2802 | if (S_ISDIR(src->i_mode)) | |
2803 | goto out; | |
2804 | ||
2805 | ret = -EACCES; | |
2806 | if (!S_ISREG(src->i_mode)) | |
2807 | goto out; | |
2808 | ||
cbf8b8ca MF |
2809 | /* pre-format output fields to sane values */ |
2810 | for (i = 0; i < same->dest_count; i++) { | |
2811 | same->info[i].bytes_deduped = 0ULL; | |
2812 | same->info[i].status = 0; | |
2813 | } | |
416161db | 2814 | |
cbf8b8ca MF |
2815 | ret = 0; |
2816 | for (i = 0; i < same->dest_count; i++) { | |
2817 | info = &same->info[i]; | |
416161db | 2818 | |
cbf8b8ca | 2819 | dst_file = fget(info->fd); |
416161db | 2820 | if (!dst_file) { |
cbf8b8ca | 2821 | info->status = -EBADF; |
416161db MF |
2822 | goto next; |
2823 | } | |
2824 | ||
2825 | if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { | |
cbf8b8ca | 2826 | info->status = -EINVAL; |
416161db MF |
2827 | goto next; |
2828 | } | |
2829 | ||
cbf8b8ca | 2830 | info->status = -EXDEV; |
416161db MF |
2831 | if (file->f_path.mnt != dst_file->f_path.mnt) |
2832 | goto next; | |
2833 | ||
2834 | dst = dst_file->f_dentry->d_inode; | |
2835 | if (src->i_sb != dst->i_sb) | |
2836 | goto next; | |
2837 | ||
2838 | if (S_ISDIR(dst->i_mode)) { | |
cbf8b8ca | 2839 | info->status = -EISDIR; |
416161db MF |
2840 | goto next; |
2841 | } | |
2842 | ||
2843 | if (!S_ISREG(dst->i_mode)) { | |
cbf8b8ca | 2844 | info->status = -EACCES; |
416161db MF |
2845 | goto next; |
2846 | } | |
2847 | ||
cbf8b8ca MF |
2848 | info->status = btrfs_extent_same(src, off, len, dst, |
2849 | info->logical_offset); | |
2850 | if (info->status == 0) | |
2851 | info->bytes_deduped += len; | |
416161db MF |
2852 | |
2853 | next: | |
2854 | if (dst_file) | |
2855 | fput(dst_file); | |
416161db MF |
2856 | } |
2857 | ||
cbf8b8ca MF |
2858 | ret = copy_to_user(argp, same, size); |
2859 | if (ret) | |
2860 | ret = -EFAULT; | |
2861 | ||
416161db MF |
2862 | out: |
2863 | mnt_drop_write_file(file); | |
2864 | return ret; | |
2865 | } | |
2866 | ||
32b7c687 MF |
2867 | /** |
2868 | * btrfs_clone() - clone a range from inode file to another | |
2869 | * | |
2870 | * @src: Inode to clone from | |
2871 | * @inode: Inode to clone to | |
2872 | * @off: Offset within source to start clone from | |
2873 | * @olen: Original length, passed by user, of range to clone | |
2874 | * @olen_aligned: Block-aligned value of olen, extent_same uses | |
2875 | * identical values here | |
2876 | * @destoff: Offset within @inode to start clone | |
2877 | */ | |
2878 | static int btrfs_clone(struct inode *src, struct inode *inode, | |
2879 | u64 off, u64 olen, u64 olen_aligned, u64 destoff) | |
f46b5a66 | 2880 | { |
f46b5a66 | 2881 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 | 2882 | struct btrfs_path *path = NULL; |
f46b5a66 | 2883 | struct extent_buffer *leaf; |
32b7c687 MF |
2884 | struct btrfs_trans_handle *trans; |
2885 | char *buf = NULL; | |
ae01a0ab | 2886 | struct btrfs_key key; |
f46b5a66 CH |
2887 | u32 nritems; |
2888 | int slot; | |
ae01a0ab | 2889 | int ret; |
32b7c687 | 2890 | u64 len = olen_aligned; |
ae01a0ab YZ |
2891 | |
2892 | ret = -ENOMEM; | |
2893 | buf = vmalloc(btrfs_level_size(root, 0)); | |
2894 | if (!buf) | |
32b7c687 | 2895 | return ret; |
ae01a0ab YZ |
2896 | |
2897 | path = btrfs_alloc_path(); | |
2898 | if (!path) { | |
2899 | vfree(buf); | |
32b7c687 | 2900 | return ret; |
d525e8ab LZ |
2901 | } |
2902 | ||
32b7c687 | 2903 | path->reada = 2; |
c5c9cd4d | 2904 | /* clone data */ |
33345d01 | 2905 | key.objectid = btrfs_ino(src); |
ae01a0ab YZ |
2906 | key.type = BTRFS_EXTENT_DATA_KEY; |
2907 | key.offset = 0; | |
f46b5a66 CH |
2908 | |
2909 | while (1) { | |
2910 | /* | |
2911 | * note the key will change type as we walk through the | |
2912 | * tree. | |
2913 | */ | |
e4355f34 | 2914 | path->leave_spinning = 1; |
362a20c5 DS |
2915 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
2916 | 0, 0); | |
f46b5a66 CH |
2917 | if (ret < 0) |
2918 | goto out; | |
2919 | ||
ae01a0ab | 2920 | nritems = btrfs_header_nritems(path->nodes[0]); |
e4355f34 | 2921 | process_slot: |
ae01a0ab | 2922 | if (path->slots[0] >= nritems) { |
362a20c5 | 2923 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
2924 | if (ret < 0) |
2925 | goto out; | |
2926 | if (ret > 0) | |
2927 | break; | |
ae01a0ab | 2928 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
2929 | } |
2930 | leaf = path->nodes[0]; | |
2931 | slot = path->slots[0]; | |
f46b5a66 | 2932 | |
ae01a0ab | 2933 | btrfs_item_key_to_cpu(leaf, &key, slot); |
d20f7043 | 2934 | if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 2935 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
2936 | break; |
2937 | ||
c5c9cd4d SW |
2938 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
2939 | struct btrfs_file_extent_item *extent; | |
2940 | int type; | |
31840ae1 ZY |
2941 | u32 size; |
2942 | struct btrfs_key new_key; | |
c5c9cd4d SW |
2943 | u64 disko = 0, diskl = 0; |
2944 | u64 datao = 0, datal = 0; | |
2945 | u8 comp; | |
b5384d48 | 2946 | u64 endoff; |
31840ae1 | 2947 | |
c5c9cd4d SW |
2948 | extent = btrfs_item_ptr(leaf, slot, |
2949 | struct btrfs_file_extent_item); | |
2950 | comp = btrfs_file_extent_compression(leaf, extent); | |
2951 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
2952 | if (type == BTRFS_FILE_EXTENT_REG || |
2953 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
2954 | disko = btrfs_file_extent_disk_bytenr(leaf, |
2955 | extent); | |
2956 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
2957 | extent); | |
c5c9cd4d | 2958 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
2959 | datal = btrfs_file_extent_num_bytes(leaf, |
2960 | extent); | |
c5c9cd4d SW |
2961 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
2962 | /* take upper bound, may be compressed */ | |
2963 | datal = btrfs_file_extent_ram_bytes(leaf, | |
2964 | extent); | |
2965 | } | |
31840ae1 | 2966 | |
050006a7 | 2967 | if (key.offset + datal <= off || |
e4355f34 FDBM |
2968 | key.offset >= off + len - 1) { |
2969 | path->slots[0]++; | |
2970 | goto process_slot; | |
2971 | } | |
2972 | ||
2973 | size = btrfs_item_size_nr(leaf, slot); | |
2974 | read_extent_buffer(leaf, buf, | |
2975 | btrfs_item_ptr_offset(leaf, slot), | |
2976 | size); | |
2977 | ||
2978 | btrfs_release_path(path); | |
2979 | path->leave_spinning = 0; | |
c5c9cd4d | 2980 | |
31840ae1 | 2981 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 2982 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
2983 | if (off <= key.offset) |
2984 | new_key.offset = key.offset + destoff - off; | |
2985 | else | |
2986 | new_key.offset = destoff; | |
31840ae1 | 2987 | |
b6f3409b SW |
2988 | /* |
2989 | * 1 - adjusting old extent (we may have to split it) | |
2990 | * 1 - add new extent | |
2991 | * 1 - inode update | |
2992 | */ | |
2993 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
2994 | if (IS_ERR(trans)) { |
2995 | ret = PTR_ERR(trans); | |
2996 | goto out; | |
2997 | } | |
2998 | ||
c8a894d7 CM |
2999 | if (type == BTRFS_FILE_EXTENT_REG || |
3000 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
3001 | /* |
3002 | * a | --- range to clone ---| b | |
3003 | * | ------------- extent ------------- | | |
3004 | */ | |
3005 | ||
3006 | /* substract range b */ | |
3007 | if (key.offset + datal > off + len) | |
3008 | datal = off + len - key.offset; | |
3009 | ||
3010 | /* substract range a */ | |
a22285a6 YZ |
3011 | if (off > key.offset) { |
3012 | datao += off - key.offset; | |
3013 | datal -= off - key.offset; | |
3014 | } | |
3015 | ||
5dc562c5 | 3016 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
3017 | new_key.offset, |
3018 | new_key.offset + datal, | |
2671485d | 3019 | 1); |
79787eaa JM |
3020 | if (ret) { |
3021 | btrfs_abort_transaction(trans, root, | |
3022 | ret); | |
3023 | btrfs_end_transaction(trans, root); | |
3024 | goto out; | |
3025 | } | |
a22285a6 | 3026 | |
c5c9cd4d SW |
3027 | ret = btrfs_insert_empty_item(trans, root, path, |
3028 | &new_key, size); | |
79787eaa JM |
3029 | if (ret) { |
3030 | btrfs_abort_transaction(trans, root, | |
3031 | ret); | |
3032 | btrfs_end_transaction(trans, root); | |
3033 | goto out; | |
3034 | } | |
c5c9cd4d SW |
3035 | |
3036 | leaf = path->nodes[0]; | |
3037 | slot = path->slots[0]; | |
3038 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
3039 | btrfs_item_ptr_offset(leaf, slot), |
3040 | size); | |
ae01a0ab | 3041 | |
c5c9cd4d | 3042 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 3043 | struct btrfs_file_extent_item); |
c5c9cd4d | 3044 | |
c5c9cd4d SW |
3045 | /* disko == 0 means it's a hole */ |
3046 | if (!disko) | |
3047 | datao = 0; | |
c5c9cd4d SW |
3048 | |
3049 | btrfs_set_file_extent_offset(leaf, extent, | |
3050 | datao); | |
3051 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
3052 | datal); | |
3053 | if (disko) { | |
3054 | inode_add_bytes(inode, datal); | |
ae01a0ab | 3055 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
3056 | disko, diskl, 0, |
3057 | root->root_key.objectid, | |
33345d01 | 3058 | btrfs_ino(inode), |
66d7e7f0 AJ |
3059 | new_key.offset - datao, |
3060 | 0); | |
79787eaa JM |
3061 | if (ret) { |
3062 | btrfs_abort_transaction(trans, | |
3063 | root, | |
3064 | ret); | |
3065 | btrfs_end_transaction(trans, | |
3066 | root); | |
3067 | goto out; | |
3068 | ||
3069 | } | |
f46b5a66 | 3070 | } |
c5c9cd4d SW |
3071 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3072 | u64 skip = 0; | |
3073 | u64 trim = 0; | |
3074 | if (off > key.offset) { | |
3075 | skip = off - key.offset; | |
3076 | new_key.offset += skip; | |
3077 | } | |
d397712b | 3078 | |
aa42ffd9 LB |
3079 | if (key.offset + datal > off + len) |
3080 | trim = key.offset + datal - (off + len); | |
d397712b | 3081 | |
c5c9cd4d | 3082 | if (comp && (skip || trim)) { |
c5c9cd4d | 3083 | ret = -EINVAL; |
a22285a6 | 3084 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
3085 | goto out; |
3086 | } | |
3087 | size -= skip + trim; | |
3088 | datal -= skip + trim; | |
a22285a6 | 3089 | |
5dc562c5 | 3090 | ret = btrfs_drop_extents(trans, root, inode, |
a22285a6 YZ |
3091 | new_key.offset, |
3092 | new_key.offset + datal, | |
2671485d | 3093 | 1); |
79787eaa JM |
3094 | if (ret) { |
3095 | btrfs_abort_transaction(trans, root, | |
3096 | ret); | |
3097 | btrfs_end_transaction(trans, root); | |
3098 | goto out; | |
3099 | } | |
a22285a6 | 3100 | |
c5c9cd4d SW |
3101 | ret = btrfs_insert_empty_item(trans, root, path, |
3102 | &new_key, size); | |
79787eaa JM |
3103 | if (ret) { |
3104 | btrfs_abort_transaction(trans, root, | |
3105 | ret); | |
3106 | btrfs_end_transaction(trans, root); | |
3107 | goto out; | |
3108 | } | |
c5c9cd4d SW |
3109 | |
3110 | if (skip) { | |
d397712b CM |
3111 | u32 start = |
3112 | btrfs_file_extent_calc_inline_size(0); | |
c5c9cd4d SW |
3113 | memmove(buf+start, buf+start+skip, |
3114 | datal); | |
3115 | } | |
3116 | ||
3117 | leaf = path->nodes[0]; | |
3118 | slot = path->slots[0]; | |
3119 | write_extent_buffer(leaf, buf, | |
3120 | btrfs_item_ptr_offset(leaf, slot), | |
3121 | size); | |
3122 | inode_add_bytes(inode, datal); | |
f46b5a66 | 3123 | } |
c5c9cd4d SW |
3124 | |
3125 | btrfs_mark_buffer_dirty(leaf); | |
b3b4aa74 | 3126 | btrfs_release_path(path); |
c5c9cd4d | 3127 | |
0c4d2d95 | 3128 | inode_inc_iversion(inode); |
a22285a6 | 3129 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
b5384d48 SW |
3130 | |
3131 | /* | |
3132 | * we round up to the block size at eof when | |
3133 | * determining which extents to clone above, | |
3134 | * but shouldn't round up the file size | |
3135 | */ | |
3136 | endoff = new_key.offset + datal; | |
5f3888ff LZ |
3137 | if (endoff > destoff+olen) |
3138 | endoff = destoff+olen; | |
b5384d48 SW |
3139 | if (endoff > inode->i_size) |
3140 | btrfs_i_size_write(inode, endoff); | |
3141 | ||
a22285a6 | 3142 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
3143 | if (ret) { |
3144 | btrfs_abort_transaction(trans, root, ret); | |
3145 | btrfs_end_transaction(trans, root); | |
3146 | goto out; | |
3147 | } | |
3148 | ret = btrfs_end_transaction(trans, root); | |
a22285a6 | 3149 | } |
b3b4aa74 | 3150 | btrfs_release_path(path); |
f46b5a66 | 3151 | key.offset++; |
f46b5a66 | 3152 | } |
f46b5a66 | 3153 | ret = 0; |
32b7c687 | 3154 | |
f46b5a66 | 3155 | out: |
b3b4aa74 | 3156 | btrfs_release_path(path); |
32b7c687 MF |
3157 | btrfs_free_path(path); |
3158 | vfree(buf); | |
3159 | return ret; | |
3160 | } | |
3161 | ||
3162 | static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, | |
3163 | u64 off, u64 olen, u64 destoff) | |
3164 | { | |
54563d41 | 3165 | struct inode *inode = file_inode(file); |
32b7c687 MF |
3166 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3167 | struct fd src_file; | |
3168 | struct inode *src; | |
3169 | int ret; | |
3170 | u64 len = olen; | |
3171 | u64 bs = root->fs_info->sb->s_blocksize; | |
3172 | int same_inode = 0; | |
3173 | ||
3174 | /* | |
3175 | * TODO: | |
3176 | * - split compressed inline extents. annoying: we need to | |
3177 | * decompress into destination's address_space (the file offset | |
3178 | * may change, so source mapping won't do), then recompress (or | |
3179 | * otherwise reinsert) a subrange. | |
3180 | * - allow ranges within the same file to be cloned (provided | |
3181 | * they don't overlap)? | |
3182 | */ | |
3183 | ||
3184 | /* the destination must be opened for writing */ | |
3185 | if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) | |
3186 | return -EINVAL; | |
3187 | ||
3188 | if (btrfs_root_readonly(root)) | |
3189 | return -EROFS; | |
3190 | ||
3191 | ret = mnt_want_write_file(file); | |
3192 | if (ret) | |
3193 | return ret; | |
3194 | ||
3195 | src_file = fdget(srcfd); | |
3196 | if (!src_file.file) { | |
3197 | ret = -EBADF; | |
3198 | goto out_drop_write; | |
3199 | } | |
3200 | ||
3201 | ret = -EXDEV; | |
3202 | if (src_file.file->f_path.mnt != file->f_path.mnt) | |
3203 | goto out_fput; | |
3204 | ||
3205 | src = file_inode(src_file.file); | |
3206 | ||
3207 | ret = -EINVAL; | |
3208 | if (src == inode) | |
3209 | same_inode = 1; | |
3210 | ||
3211 | /* the src must be open for reading */ | |
3212 | if (!(src_file.file->f_mode & FMODE_READ)) | |
3213 | goto out_fput; | |
3214 | ||
3215 | /* don't make the dst file partly checksummed */ | |
3216 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3217 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
3218 | goto out_fput; | |
3219 | ||
3220 | ret = -EISDIR; | |
3221 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) | |
3222 | goto out_fput; | |
3223 | ||
3224 | ret = -EXDEV; | |
3225 | if (src->i_sb != inode->i_sb) | |
3226 | goto out_fput; | |
3227 | ||
3228 | if (!same_inode) { | |
3229 | if (inode < src) { | |
3230 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); | |
3231 | mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); | |
3232 | } else { | |
3233 | mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); | |
3234 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); | |
3235 | } | |
3236 | } else { | |
3237 | mutex_lock(&src->i_mutex); | |
3238 | } | |
3239 | ||
3240 | /* determine range to clone */ | |
3241 | ret = -EINVAL; | |
3242 | if (off + len > src->i_size || off + len < off) | |
3243 | goto out_unlock; | |
3244 | if (len == 0) | |
3245 | olen = len = src->i_size - off; | |
3246 | /* if we extend to eof, continue to block boundary */ | |
3247 | if (off + len == src->i_size) | |
3248 | len = ALIGN(src->i_size, bs) - off; | |
3249 | ||
3250 | /* verify the end result is block aligned */ | |
3251 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || | |
3252 | !IS_ALIGNED(destoff, bs)) | |
3253 | goto out_unlock; | |
3254 | ||
3255 | /* verify if ranges are overlapped within the same file */ | |
3256 | if (same_inode) { | |
3257 | if (destoff + len > off && destoff < off + len) | |
3258 | goto out_unlock; | |
3259 | } | |
3260 | ||
3261 | if (destoff > inode->i_size) { | |
3262 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
3263 | if (ret) | |
3264 | goto out_unlock; | |
3265 | } | |
3266 | ||
3267 | /* truncate page cache pages from target inode range */ | |
3268 | truncate_inode_pages_range(&inode->i_data, destoff, | |
3269 | PAGE_CACHE_ALIGN(destoff + len) - 1); | |
3270 | ||
3271 | lock_extent_range(src, off, len); | |
3272 | ||
3273 | ret = btrfs_clone(src, inode, off, olen, len, destoff); | |
3274 | ||
aa42ffd9 | 3275 | unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1); |
f46b5a66 | 3276 | out_unlock: |
c57c2b3e FDBM |
3277 | if (!same_inode) { |
3278 | if (inode < src) { | |
3279 | mutex_unlock(&src->i_mutex); | |
3280 | mutex_unlock(&inode->i_mutex); | |
3281 | } else { | |
3282 | mutex_unlock(&inode->i_mutex); | |
3283 | mutex_unlock(&src->i_mutex); | |
3284 | } | |
3285 | } else { | |
3286 | mutex_unlock(&src->i_mutex); | |
3287 | } | |
f46b5a66 | 3288 | out_fput: |
2903ff01 | 3289 | fdput(src_file); |
ab67b7c1 | 3290 | out_drop_write: |
2a79f17e | 3291 | mnt_drop_write_file(file); |
f46b5a66 CH |
3292 | return ret; |
3293 | } | |
3294 | ||
7a865e8a | 3295 | static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) |
c5c9cd4d SW |
3296 | { |
3297 | struct btrfs_ioctl_clone_range_args args; | |
3298 | ||
7a865e8a | 3299 | if (copy_from_user(&args, argp, sizeof(args))) |
c5c9cd4d SW |
3300 | return -EFAULT; |
3301 | return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, | |
3302 | args.src_length, args.dest_offset); | |
3303 | } | |
3304 | ||
f46b5a66 CH |
3305 | /* |
3306 | * there are many ways the trans_start and trans_end ioctls can lead | |
3307 | * to deadlocks. They should only be used by applications that | |
3308 | * basically own the machine, and have a very in depth understanding | |
3309 | * of all the possible deadlocks and enospc problems. | |
3310 | */ | |
b2950863 | 3311 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 3312 | { |
496ad9aa | 3313 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3314 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3315 | struct btrfs_trans_handle *trans; | |
1ab86aed | 3316 | int ret; |
f46b5a66 | 3317 | |
1ab86aed | 3318 | ret = -EPERM; |
df5b5520 | 3319 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 3320 | goto out; |
df5b5520 | 3321 | |
1ab86aed SW |
3322 | ret = -EINPROGRESS; |
3323 | if (file->private_data) | |
f46b5a66 | 3324 | goto out; |
9ca9ee09 | 3325 | |
b83cc969 LZ |
3326 | ret = -EROFS; |
3327 | if (btrfs_root_readonly(root)) | |
3328 | goto out; | |
3329 | ||
a561be71 | 3330 | ret = mnt_want_write_file(file); |
c146afad YZ |
3331 | if (ret) |
3332 | goto out; | |
3333 | ||
a4abeea4 | 3334 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3335 | |
1ab86aed | 3336 | ret = -ENOMEM; |
7a7eaa40 | 3337 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 3338 | if (IS_ERR(trans)) |
1ab86aed SW |
3339 | goto out_drop; |
3340 | ||
3341 | file->private_data = trans; | |
3342 | return 0; | |
3343 | ||
3344 | out_drop: | |
a4abeea4 | 3345 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 3346 | mnt_drop_write_file(file); |
f46b5a66 | 3347 | out: |
f46b5a66 CH |
3348 | return ret; |
3349 | } | |
3350 | ||
6ef5ed0d JB |
3351 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
3352 | { | |
496ad9aa | 3353 | struct inode *inode = file_inode(file); |
6ef5ed0d JB |
3354 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3355 | struct btrfs_root *new_root; | |
3356 | struct btrfs_dir_item *di; | |
3357 | struct btrfs_trans_handle *trans; | |
3358 | struct btrfs_path *path; | |
3359 | struct btrfs_key location; | |
3360 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
3361 | u64 objectid = 0; |
3362 | u64 dir_id; | |
3c04ce01 | 3363 | int ret; |
6ef5ed0d JB |
3364 | |
3365 | if (!capable(CAP_SYS_ADMIN)) | |
3366 | return -EPERM; | |
3367 | ||
3c04ce01 MX |
3368 | ret = mnt_want_write_file(file); |
3369 | if (ret) | |
3370 | return ret; | |
3371 | ||
3372 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
3373 | ret = -EFAULT; | |
3374 | goto out; | |
3375 | } | |
6ef5ed0d JB |
3376 | |
3377 | if (!objectid) | |
1cecf579 | 3378 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d JB |
3379 | |
3380 | location.objectid = objectid; | |
3381 | location.type = BTRFS_ROOT_ITEM_KEY; | |
3382 | location.offset = (u64)-1; | |
3383 | ||
3384 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
3c04ce01 MX |
3385 | if (IS_ERR(new_root)) { |
3386 | ret = PTR_ERR(new_root); | |
3387 | goto out; | |
3388 | } | |
6ef5ed0d | 3389 | |
6ef5ed0d | 3390 | path = btrfs_alloc_path(); |
3c04ce01 MX |
3391 | if (!path) { |
3392 | ret = -ENOMEM; | |
3393 | goto out; | |
3394 | } | |
6ef5ed0d JB |
3395 | path->leave_spinning = 1; |
3396 | ||
3397 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 3398 | if (IS_ERR(trans)) { |
6ef5ed0d | 3399 | btrfs_free_path(path); |
3c04ce01 MX |
3400 | ret = PTR_ERR(trans); |
3401 | goto out; | |
6ef5ed0d JB |
3402 | } |
3403 | ||
6c41761f | 3404 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
3405 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
3406 | dir_id, "default", 7, 1); | |
cf1e99a4 | 3407 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
3408 | btrfs_free_path(path); |
3409 | btrfs_end_transaction(trans, root); | |
efe120a0 FH |
3410 | btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" |
3411 | "item, this isn't going to work"); | |
3c04ce01 MX |
3412 | ret = -ENOENT; |
3413 | goto out; | |
6ef5ed0d JB |
3414 | } |
3415 | ||
3416 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
3417 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
3418 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3419 | btrfs_free_path(path); | |
3420 | ||
2b0ce2c2 | 3421 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d | 3422 | btrfs_end_transaction(trans, root); |
3c04ce01 MX |
3423 | out: |
3424 | mnt_drop_write_file(file); | |
3425 | return ret; | |
6ef5ed0d JB |
3426 | } |
3427 | ||
5af3e8cc SB |
3428 | void btrfs_get_block_group_info(struct list_head *groups_list, |
3429 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
3430 | { |
3431 | struct btrfs_block_group_cache *block_group; | |
3432 | ||
3433 | space->total_bytes = 0; | |
3434 | space->used_bytes = 0; | |
3435 | space->flags = 0; | |
3436 | list_for_each_entry(block_group, groups_list, list) { | |
3437 | space->flags = block_group->flags; | |
3438 | space->total_bytes += block_group->key.offset; | |
3439 | space->used_bytes += | |
3440 | btrfs_block_group_used(&block_group->item); | |
3441 | } | |
3442 | } | |
3443 | ||
48a3b636 | 3444 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1406e432 JB |
3445 | { |
3446 | struct btrfs_ioctl_space_args space_args; | |
3447 | struct btrfs_ioctl_space_info space; | |
3448 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 3449 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 3450 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 3451 | struct btrfs_space_info *info; |
bf5fc093 JB |
3452 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
3453 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3454 | BTRFS_BLOCK_GROUP_METADATA, | |
3455 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
3456 | int num_types = 4; | |
7fde62bf | 3457 | int alloc_size; |
1406e432 | 3458 | int ret = 0; |
51788b1b | 3459 | u64 slot_count = 0; |
bf5fc093 | 3460 | int i, c; |
1406e432 JB |
3461 | |
3462 | if (copy_from_user(&space_args, | |
3463 | (struct btrfs_ioctl_space_args __user *)arg, | |
3464 | sizeof(space_args))) | |
3465 | return -EFAULT; | |
3466 | ||
bf5fc093 JB |
3467 | for (i = 0; i < num_types; i++) { |
3468 | struct btrfs_space_info *tmp; | |
3469 | ||
3470 | info = NULL; | |
3471 | rcu_read_lock(); | |
3472 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3473 | list) { | |
3474 | if (tmp->flags == types[i]) { | |
3475 | info = tmp; | |
3476 | break; | |
3477 | } | |
3478 | } | |
3479 | rcu_read_unlock(); | |
3480 | ||
3481 | if (!info) | |
3482 | continue; | |
3483 | ||
3484 | down_read(&info->groups_sem); | |
3485 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3486 | if (!list_empty(&info->block_groups[c])) | |
3487 | slot_count++; | |
3488 | } | |
3489 | up_read(&info->groups_sem); | |
3490 | } | |
7fde62bf CM |
3491 | |
3492 | /* space_slots == 0 means they are asking for a count */ | |
3493 | if (space_args.space_slots == 0) { | |
3494 | space_args.total_spaces = slot_count; | |
3495 | goto out; | |
3496 | } | |
bf5fc093 | 3497 | |
51788b1b | 3498 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 3499 | |
7fde62bf | 3500 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 3501 | |
7fde62bf CM |
3502 | /* we generally have at most 6 or so space infos, one for each raid |
3503 | * level. So, a whole page should be more than enough for everyone | |
3504 | */ | |
3505 | if (alloc_size > PAGE_CACHE_SIZE) | |
3506 | return -ENOMEM; | |
3507 | ||
1406e432 | 3508 | space_args.total_spaces = 0; |
7fde62bf CM |
3509 | dest = kmalloc(alloc_size, GFP_NOFS); |
3510 | if (!dest) | |
3511 | return -ENOMEM; | |
3512 | dest_orig = dest; | |
1406e432 | 3513 | |
7fde62bf | 3514 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
3515 | for (i = 0; i < num_types; i++) { |
3516 | struct btrfs_space_info *tmp; | |
3517 | ||
51788b1b DR |
3518 | if (!slot_count) |
3519 | break; | |
3520 | ||
bf5fc093 JB |
3521 | info = NULL; |
3522 | rcu_read_lock(); | |
3523 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
3524 | list) { | |
3525 | if (tmp->flags == types[i]) { | |
3526 | info = tmp; | |
3527 | break; | |
3528 | } | |
3529 | } | |
3530 | rcu_read_unlock(); | |
7fde62bf | 3531 | |
bf5fc093 JB |
3532 | if (!info) |
3533 | continue; | |
3534 | down_read(&info->groups_sem); | |
3535 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3536 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
3537 | btrfs_get_block_group_info( |
3538 | &info->block_groups[c], &space); | |
bf5fc093 JB |
3539 | memcpy(dest, &space, sizeof(space)); |
3540 | dest++; | |
3541 | space_args.total_spaces++; | |
51788b1b | 3542 | slot_count--; |
bf5fc093 | 3543 | } |
51788b1b DR |
3544 | if (!slot_count) |
3545 | break; | |
bf5fc093 JB |
3546 | } |
3547 | up_read(&info->groups_sem); | |
1406e432 | 3548 | } |
1406e432 | 3549 | |
2eec6c81 | 3550 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
3551 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
3552 | ||
3553 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
3554 | ret = -EFAULT; | |
3555 | ||
3556 | kfree(dest_orig); | |
3557 | out: | |
3558 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
3559 | ret = -EFAULT; |
3560 | ||
3561 | return ret; | |
3562 | } | |
3563 | ||
01e219e8 JM |
3564 | static long btrfs_ioctl_global_rsv(struct btrfs_root *root, void __user *arg) |
3565 | { | |
3566 | struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; | |
3567 | u64 reserved; | |
3568 | ||
3569 | spin_lock(&block_rsv->lock); | |
3570 | reserved = block_rsv->reserved; | |
3571 | spin_unlock(&block_rsv->lock); | |
3572 | ||
3573 | if (arg && copy_to_user(arg, &reserved, sizeof(reserved))) | |
3574 | return -EFAULT; | |
3575 | return 0; | |
3576 | } | |
3577 | ||
f46b5a66 CH |
3578 | /* |
3579 | * there are many ways the trans_start and trans_end ioctls can lead | |
3580 | * to deadlocks. They should only be used by applications that | |
3581 | * basically own the machine, and have a very in depth understanding | |
3582 | * of all the possible deadlocks and enospc problems. | |
3583 | */ | |
3584 | long btrfs_ioctl_trans_end(struct file *file) | |
3585 | { | |
496ad9aa | 3586 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3587 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3588 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 3589 | |
f46b5a66 | 3590 | trans = file->private_data; |
1ab86aed SW |
3591 | if (!trans) |
3592 | return -EINVAL; | |
b214107e | 3593 | file->private_data = NULL; |
9ca9ee09 | 3594 | |
1ab86aed SW |
3595 | btrfs_end_transaction(trans, root); |
3596 | ||
a4abeea4 | 3597 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3598 | |
2a79f17e | 3599 | mnt_drop_write_file(file); |
1ab86aed | 3600 | return 0; |
f46b5a66 CH |
3601 | } |
3602 | ||
9a8c28be MX |
3603 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
3604 | void __user *argp) | |
46204592 | 3605 | { |
46204592 SW |
3606 | struct btrfs_trans_handle *trans; |
3607 | u64 transid; | |
db5b493a | 3608 | int ret; |
46204592 | 3609 | |
d4edf39b | 3610 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
3611 | if (IS_ERR(trans)) { |
3612 | if (PTR_ERR(trans) != -ENOENT) | |
3613 | return PTR_ERR(trans); | |
3614 | ||
3615 | /* No running transaction, don't bother */ | |
3616 | transid = root->fs_info->last_trans_committed; | |
3617 | goto out; | |
3618 | } | |
46204592 | 3619 | transid = trans->transid; |
db5b493a | 3620 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
3621 | if (ret) { |
3622 | btrfs_end_transaction(trans, root); | |
db5b493a | 3623 | return ret; |
8b2b2d3c | 3624 | } |
ff7c1d33 | 3625 | out: |
46204592 SW |
3626 | if (argp) |
3627 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
3628 | return -EFAULT; | |
3629 | return 0; | |
3630 | } | |
3631 | ||
9a8c28be MX |
3632 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
3633 | void __user *argp) | |
46204592 | 3634 | { |
46204592 SW |
3635 | u64 transid; |
3636 | ||
3637 | if (argp) { | |
3638 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
3639 | return -EFAULT; | |
3640 | } else { | |
3641 | transid = 0; /* current trans */ | |
3642 | } | |
3643 | return btrfs_wait_for_commit(root, transid); | |
3644 | } | |
3645 | ||
b8e95489 | 3646 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 3647 | { |
496ad9aa | 3648 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
475f6387 | 3649 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 3650 | int ret; |
475f6387 JS |
3651 | |
3652 | if (!capable(CAP_SYS_ADMIN)) | |
3653 | return -EPERM; | |
3654 | ||
3655 | sa = memdup_user(arg, sizeof(*sa)); | |
3656 | if (IS_ERR(sa)) | |
3657 | return PTR_ERR(sa); | |
3658 | ||
b8e95489 MX |
3659 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
3660 | ret = mnt_want_write_file(file); | |
3661 | if (ret) | |
3662 | goto out; | |
3663 | } | |
3664 | ||
aa1b8cd4 | 3665 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
3666 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
3667 | 0); | |
475f6387 JS |
3668 | |
3669 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3670 | ret = -EFAULT; | |
3671 | ||
b8e95489 MX |
3672 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
3673 | mnt_drop_write_file(file); | |
3674 | out: | |
475f6387 JS |
3675 | kfree(sa); |
3676 | return ret; | |
3677 | } | |
3678 | ||
3679 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
3680 | { | |
3681 | if (!capable(CAP_SYS_ADMIN)) | |
3682 | return -EPERM; | |
3683 | ||
aa1b8cd4 | 3684 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
3685 | } |
3686 | ||
3687 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
3688 | void __user *arg) | |
3689 | { | |
3690 | struct btrfs_ioctl_scrub_args *sa; | |
3691 | int ret; | |
3692 | ||
3693 | if (!capable(CAP_SYS_ADMIN)) | |
3694 | return -EPERM; | |
3695 | ||
3696 | sa = memdup_user(arg, sizeof(*sa)); | |
3697 | if (IS_ERR(sa)) | |
3698 | return PTR_ERR(sa); | |
3699 | ||
3700 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
3701 | ||
3702 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3703 | ret = -EFAULT; | |
3704 | ||
3705 | kfree(sa); | |
3706 | return ret; | |
3707 | } | |
3708 | ||
c11d2c23 | 3709 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 3710 | void __user *arg) |
c11d2c23 SB |
3711 | { |
3712 | struct btrfs_ioctl_get_dev_stats *sa; | |
3713 | int ret; | |
3714 | ||
c11d2c23 SB |
3715 | sa = memdup_user(arg, sizeof(*sa)); |
3716 | if (IS_ERR(sa)) | |
3717 | return PTR_ERR(sa); | |
3718 | ||
b27f7c0c DS |
3719 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
3720 | kfree(sa); | |
3721 | return -EPERM; | |
3722 | } | |
3723 | ||
3724 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
3725 | |
3726 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
3727 | ret = -EFAULT; | |
3728 | ||
3729 | kfree(sa); | |
3730 | return ret; | |
3731 | } | |
3732 | ||
3f6bcfbd SB |
3733 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
3734 | { | |
3735 | struct btrfs_ioctl_dev_replace_args *p; | |
3736 | int ret; | |
3737 | ||
3738 | if (!capable(CAP_SYS_ADMIN)) | |
3739 | return -EPERM; | |
3740 | ||
3741 | p = memdup_user(arg, sizeof(*p)); | |
3742 | if (IS_ERR(p)) | |
3743 | return PTR_ERR(p); | |
3744 | ||
3745 | switch (p->cmd) { | |
3746 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
adfa97cb ID |
3747 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
3748 | ret = -EROFS; | |
3749 | goto out; | |
3750 | } | |
3f6bcfbd SB |
3751 | if (atomic_xchg( |
3752 | &root->fs_info->mutually_exclusive_operation_running, | |
3753 | 1)) { | |
e57138b3 | 3754 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd SB |
3755 | } else { |
3756 | ret = btrfs_dev_replace_start(root, p); | |
3757 | atomic_set( | |
3758 | &root->fs_info->mutually_exclusive_operation_running, | |
3759 | 0); | |
3760 | } | |
3761 | break; | |
3762 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
3763 | btrfs_dev_replace_status(root->fs_info, p); | |
3764 | ret = 0; | |
3765 | break; | |
3766 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
3767 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
3768 | break; | |
3769 | default: | |
3770 | ret = -EINVAL; | |
3771 | break; | |
3772 | } | |
3773 | ||
3774 | if (copy_to_user(arg, p, sizeof(*p))) | |
3775 | ret = -EFAULT; | |
adfa97cb | 3776 | out: |
3f6bcfbd SB |
3777 | kfree(p); |
3778 | return ret; | |
3779 | } | |
3780 | ||
d7728c96 JS |
3781 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
3782 | { | |
3783 | int ret = 0; | |
3784 | int i; | |
740c3d22 | 3785 | u64 rel_ptr; |
d7728c96 | 3786 | int size; |
806468f8 | 3787 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
3788 | struct inode_fs_paths *ipath = NULL; |
3789 | struct btrfs_path *path; | |
3790 | ||
82b22ac8 | 3791 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
3792 | return -EPERM; |
3793 | ||
3794 | path = btrfs_alloc_path(); | |
3795 | if (!path) { | |
3796 | ret = -ENOMEM; | |
3797 | goto out; | |
3798 | } | |
3799 | ||
3800 | ipa = memdup_user(arg, sizeof(*ipa)); | |
3801 | if (IS_ERR(ipa)) { | |
3802 | ret = PTR_ERR(ipa); | |
3803 | ipa = NULL; | |
3804 | goto out; | |
3805 | } | |
3806 | ||
3807 | size = min_t(u32, ipa->size, 4096); | |
3808 | ipath = init_ipath(size, root, path); | |
3809 | if (IS_ERR(ipath)) { | |
3810 | ret = PTR_ERR(ipath); | |
3811 | ipath = NULL; | |
3812 | goto out; | |
3813 | } | |
3814 | ||
3815 | ret = paths_from_inode(ipa->inum, ipath); | |
3816 | if (ret < 0) | |
3817 | goto out; | |
3818 | ||
3819 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
3820 | rel_ptr = ipath->fspath->val[i] - |
3821 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 3822 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
3823 | } |
3824 | ||
745c4d8e JM |
3825 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
3826 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
3827 | if (ret) { |
3828 | ret = -EFAULT; | |
3829 | goto out; | |
3830 | } | |
3831 | ||
3832 | out: | |
3833 | btrfs_free_path(path); | |
3834 | free_ipath(ipath); | |
3835 | kfree(ipa); | |
3836 | ||
3837 | return ret; | |
3838 | } | |
3839 | ||
3840 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
3841 | { | |
3842 | struct btrfs_data_container *inodes = ctx; | |
3843 | const size_t c = 3 * sizeof(u64); | |
3844 | ||
3845 | if (inodes->bytes_left >= c) { | |
3846 | inodes->bytes_left -= c; | |
3847 | inodes->val[inodes->elem_cnt] = inum; | |
3848 | inodes->val[inodes->elem_cnt + 1] = offset; | |
3849 | inodes->val[inodes->elem_cnt + 2] = root; | |
3850 | inodes->elem_cnt += 3; | |
3851 | } else { | |
3852 | inodes->bytes_missing += c - inodes->bytes_left; | |
3853 | inodes->bytes_left = 0; | |
3854 | inodes->elem_missed += 3; | |
3855 | } | |
3856 | ||
3857 | return 0; | |
3858 | } | |
3859 | ||
3860 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
3861 | void __user *arg) | |
3862 | { | |
3863 | int ret = 0; | |
3864 | int size; | |
d7728c96 JS |
3865 | struct btrfs_ioctl_logical_ino_args *loi; |
3866 | struct btrfs_data_container *inodes = NULL; | |
3867 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
3868 | |
3869 | if (!capable(CAP_SYS_ADMIN)) | |
3870 | return -EPERM; | |
3871 | ||
3872 | loi = memdup_user(arg, sizeof(*loi)); | |
3873 | if (IS_ERR(loi)) { | |
3874 | ret = PTR_ERR(loi); | |
3875 | loi = NULL; | |
3876 | goto out; | |
3877 | } | |
3878 | ||
3879 | path = btrfs_alloc_path(); | |
3880 | if (!path) { | |
3881 | ret = -ENOMEM; | |
3882 | goto out; | |
3883 | } | |
3884 | ||
425d17a2 | 3885 | size = min_t(u32, loi->size, 64 * 1024); |
d7728c96 JS |
3886 | inodes = init_data_container(size); |
3887 | if (IS_ERR(inodes)) { | |
3888 | ret = PTR_ERR(inodes); | |
3889 | inodes = NULL; | |
3890 | goto out; | |
3891 | } | |
3892 | ||
df031f07 LB |
3893 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
3894 | build_ino_list, inodes); | |
3895 | if (ret == -EINVAL) | |
d7728c96 JS |
3896 | ret = -ENOENT; |
3897 | if (ret < 0) | |
3898 | goto out; | |
3899 | ||
745c4d8e JM |
3900 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
3901 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
3902 | if (ret) |
3903 | ret = -EFAULT; | |
3904 | ||
3905 | out: | |
3906 | btrfs_free_path(path); | |
425d17a2 | 3907 | vfree(inodes); |
d7728c96 JS |
3908 | kfree(loi); |
3909 | ||
3910 | return ret; | |
3911 | } | |
3912 | ||
19a39dce | 3913 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
3914 | struct btrfs_ioctl_balance_args *bargs) |
3915 | { | |
3916 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
3917 | ||
3918 | bargs->flags = bctl->flags; | |
3919 | ||
837d5b6e ID |
3920 | if (atomic_read(&fs_info->balance_running)) |
3921 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
3922 | if (atomic_read(&fs_info->balance_pause_req)) | |
3923 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
3924 | if (atomic_read(&fs_info->balance_cancel_req)) |
3925 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 3926 | |
c9e9f97b ID |
3927 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
3928 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
3929 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
3930 | |
3931 | if (lock) { | |
3932 | spin_lock(&fs_info->balance_lock); | |
3933 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3934 | spin_unlock(&fs_info->balance_lock); | |
3935 | } else { | |
3936 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
3937 | } | |
c9e9f97b ID |
3938 | } |
3939 | ||
9ba1f6e4 | 3940 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 3941 | { |
496ad9aa | 3942 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
3943 | struct btrfs_fs_info *fs_info = root->fs_info; |
3944 | struct btrfs_ioctl_balance_args *bargs; | |
3945 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 3946 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
3947 | int ret; |
3948 | ||
3949 | if (!capable(CAP_SYS_ADMIN)) | |
3950 | return -EPERM; | |
3951 | ||
e54bfa31 | 3952 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
3953 | if (ret) |
3954 | return ret; | |
3955 | ||
ed0fb78f ID |
3956 | again: |
3957 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { | |
3958 | mutex_lock(&fs_info->volume_mutex); | |
3959 | mutex_lock(&fs_info->balance_mutex); | |
3960 | need_unlock = true; | |
3961 | goto locked; | |
3962 | } | |
3963 | ||
3964 | /* | |
3965 | * mut. excl. ops lock is locked. Three possibilites: | |
3966 | * (1) some other op is running | |
3967 | * (2) balance is running | |
3968 | * (3) balance is paused -- special case (think resume) | |
3969 | */ | |
c9e9f97b | 3970 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
3971 | if (fs_info->balance_ctl) { |
3972 | /* this is either (2) or (3) */ | |
3973 | if (!atomic_read(&fs_info->balance_running)) { | |
3974 | mutex_unlock(&fs_info->balance_mutex); | |
3975 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
3976 | goto again; | |
3977 | mutex_lock(&fs_info->balance_mutex); | |
3978 | ||
3979 | if (fs_info->balance_ctl && | |
3980 | !atomic_read(&fs_info->balance_running)) { | |
3981 | /* this is (3) */ | |
3982 | need_unlock = false; | |
3983 | goto locked; | |
3984 | } | |
3985 | ||
3986 | mutex_unlock(&fs_info->balance_mutex); | |
3987 | mutex_unlock(&fs_info->volume_mutex); | |
3988 | goto again; | |
3989 | } else { | |
3990 | /* this is (2) */ | |
3991 | mutex_unlock(&fs_info->balance_mutex); | |
3992 | ret = -EINPROGRESS; | |
3993 | goto out; | |
3994 | } | |
3995 | } else { | |
3996 | /* this is (1) */ | |
3997 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 3998 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
3999 | goto out; |
4000 | } | |
4001 | ||
4002 | locked: | |
4003 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); | |
c9e9f97b ID |
4004 | |
4005 | if (arg) { | |
4006 | bargs = memdup_user(arg, sizeof(*bargs)); | |
4007 | if (IS_ERR(bargs)) { | |
4008 | ret = PTR_ERR(bargs); | |
ed0fb78f | 4009 | goto out_unlock; |
c9e9f97b | 4010 | } |
de322263 ID |
4011 | |
4012 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
4013 | if (!fs_info->balance_ctl) { | |
4014 | ret = -ENOTCONN; | |
4015 | goto out_bargs; | |
4016 | } | |
4017 | ||
4018 | bctl = fs_info->balance_ctl; | |
4019 | spin_lock(&fs_info->balance_lock); | |
4020 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
4021 | spin_unlock(&fs_info->balance_lock); | |
4022 | ||
4023 | goto do_balance; | |
4024 | } | |
c9e9f97b ID |
4025 | } else { |
4026 | bargs = NULL; | |
4027 | } | |
4028 | ||
ed0fb78f | 4029 | if (fs_info->balance_ctl) { |
837d5b6e ID |
4030 | ret = -EINPROGRESS; |
4031 | goto out_bargs; | |
4032 | } | |
4033 | ||
c9e9f97b ID |
4034 | bctl = kzalloc(sizeof(*bctl), GFP_NOFS); |
4035 | if (!bctl) { | |
4036 | ret = -ENOMEM; | |
4037 | goto out_bargs; | |
4038 | } | |
4039 | ||
4040 | bctl->fs_info = fs_info; | |
4041 | if (arg) { | |
4042 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
4043 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
4044 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
4045 | ||
4046 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
4047 | } else { |
4048 | /* balance everything - no filters */ | |
4049 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
4050 | } |
4051 | ||
de322263 | 4052 | do_balance: |
c9e9f97b | 4053 | /* |
ed0fb78f ID |
4054 | * Ownership of bctl and mutually_exclusive_operation_running |
4055 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, | |
4056 | * or, if restriper was paused all the way until unmount, in | |
4057 | * free_fs_info. mutually_exclusive_operation_running is | |
4058 | * cleared in __cancel_balance. | |
c9e9f97b | 4059 | */ |
ed0fb78f ID |
4060 | need_unlock = false; |
4061 | ||
4062 | ret = btrfs_balance(bctl, bargs); | |
4063 | ||
c9e9f97b ID |
4064 | if (arg) { |
4065 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4066 | ret = -EFAULT; | |
4067 | } | |
4068 | ||
4069 | out_bargs: | |
4070 | kfree(bargs); | |
ed0fb78f | 4071 | out_unlock: |
c9e9f97b ID |
4072 | mutex_unlock(&fs_info->balance_mutex); |
4073 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f ID |
4074 | if (need_unlock) |
4075 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
4076 | out: | |
e54bfa31 | 4077 | mnt_drop_write_file(file); |
c9e9f97b ID |
4078 | return ret; |
4079 | } | |
4080 | ||
837d5b6e ID |
4081 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
4082 | { | |
4083 | if (!capable(CAP_SYS_ADMIN)) | |
4084 | return -EPERM; | |
4085 | ||
4086 | switch (cmd) { | |
4087 | case BTRFS_BALANCE_CTL_PAUSE: | |
4088 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
4089 | case BTRFS_BALANCE_CTL_CANCEL: |
4090 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
4091 | } |
4092 | ||
4093 | return -EINVAL; | |
4094 | } | |
4095 | ||
19a39dce ID |
4096 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
4097 | void __user *arg) | |
4098 | { | |
4099 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4100 | struct btrfs_ioctl_balance_args *bargs; | |
4101 | int ret = 0; | |
4102 | ||
4103 | if (!capable(CAP_SYS_ADMIN)) | |
4104 | return -EPERM; | |
4105 | ||
4106 | mutex_lock(&fs_info->balance_mutex); | |
4107 | if (!fs_info->balance_ctl) { | |
4108 | ret = -ENOTCONN; | |
4109 | goto out; | |
4110 | } | |
4111 | ||
4112 | bargs = kzalloc(sizeof(*bargs), GFP_NOFS); | |
4113 | if (!bargs) { | |
4114 | ret = -ENOMEM; | |
4115 | goto out; | |
4116 | } | |
4117 | ||
4118 | update_ioctl_balance_args(fs_info, 1, bargs); | |
4119 | ||
4120 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4121 | ret = -EFAULT; | |
4122 | ||
4123 | kfree(bargs); | |
4124 | out: | |
4125 | mutex_unlock(&fs_info->balance_mutex); | |
4126 | return ret; | |
4127 | } | |
4128 | ||
905b0dda | 4129 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4130 | { |
496ad9aa | 4131 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4132 | struct btrfs_ioctl_quota_ctl_args *sa; |
4133 | struct btrfs_trans_handle *trans = NULL; | |
4134 | int ret; | |
4135 | int err; | |
4136 | ||
4137 | if (!capable(CAP_SYS_ADMIN)) | |
4138 | return -EPERM; | |
4139 | ||
905b0dda MX |
4140 | ret = mnt_want_write_file(file); |
4141 | if (ret) | |
4142 | return ret; | |
5d13a37b AJ |
4143 | |
4144 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4145 | if (IS_ERR(sa)) { |
4146 | ret = PTR_ERR(sa); | |
4147 | goto drop_write; | |
4148 | } | |
5d13a37b | 4149 | |
7708f029 | 4150 | down_write(&root->fs_info->subvol_sem); |
2f232036 JS |
4151 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
4152 | if (IS_ERR(trans)) { | |
4153 | ret = PTR_ERR(trans); | |
4154 | goto out; | |
5d13a37b AJ |
4155 | } |
4156 | ||
4157 | switch (sa->cmd) { | |
4158 | case BTRFS_QUOTA_CTL_ENABLE: | |
4159 | ret = btrfs_quota_enable(trans, root->fs_info); | |
4160 | break; | |
4161 | case BTRFS_QUOTA_CTL_DISABLE: | |
4162 | ret = btrfs_quota_disable(trans, root->fs_info); | |
4163 | break; | |
5d13a37b AJ |
4164 | default: |
4165 | ret = -EINVAL; | |
4166 | break; | |
4167 | } | |
4168 | ||
2f232036 JS |
4169 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
4170 | if (err && !ret) | |
4171 | ret = err; | |
5d13a37b AJ |
4172 | out: |
4173 | kfree(sa); | |
7708f029 | 4174 | up_write(&root->fs_info->subvol_sem); |
905b0dda MX |
4175 | drop_write: |
4176 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4177 | return ret; |
4178 | } | |
4179 | ||
905b0dda | 4180 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4181 | { |
496ad9aa | 4182 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4183 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4184 | struct btrfs_trans_handle *trans; | |
4185 | int ret; | |
4186 | int err; | |
4187 | ||
4188 | if (!capable(CAP_SYS_ADMIN)) | |
4189 | return -EPERM; | |
4190 | ||
905b0dda MX |
4191 | ret = mnt_want_write_file(file); |
4192 | if (ret) | |
4193 | return ret; | |
5d13a37b AJ |
4194 | |
4195 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4196 | if (IS_ERR(sa)) { |
4197 | ret = PTR_ERR(sa); | |
4198 | goto drop_write; | |
4199 | } | |
5d13a37b AJ |
4200 | |
4201 | trans = btrfs_join_transaction(root); | |
4202 | if (IS_ERR(trans)) { | |
4203 | ret = PTR_ERR(trans); | |
4204 | goto out; | |
4205 | } | |
4206 | ||
4207 | /* FIXME: check if the IDs really exist */ | |
4208 | if (sa->assign) { | |
4209 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
4210 | sa->src, sa->dst); | |
4211 | } else { | |
4212 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
4213 | sa->src, sa->dst); | |
4214 | } | |
4215 | ||
4216 | err = btrfs_end_transaction(trans, root); | |
4217 | if (err && !ret) | |
4218 | ret = err; | |
4219 | ||
4220 | out: | |
4221 | kfree(sa); | |
905b0dda MX |
4222 | drop_write: |
4223 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4224 | return ret; |
4225 | } | |
4226 | ||
905b0dda | 4227 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4228 | { |
496ad9aa | 4229 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4230 | struct btrfs_ioctl_qgroup_create_args *sa; |
4231 | struct btrfs_trans_handle *trans; | |
4232 | int ret; | |
4233 | int err; | |
4234 | ||
4235 | if (!capable(CAP_SYS_ADMIN)) | |
4236 | return -EPERM; | |
4237 | ||
905b0dda MX |
4238 | ret = mnt_want_write_file(file); |
4239 | if (ret) | |
4240 | return ret; | |
5d13a37b AJ |
4241 | |
4242 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4243 | if (IS_ERR(sa)) { |
4244 | ret = PTR_ERR(sa); | |
4245 | goto drop_write; | |
4246 | } | |
5d13a37b | 4247 | |
d86e56cf MX |
4248 | if (!sa->qgroupid) { |
4249 | ret = -EINVAL; | |
4250 | goto out; | |
4251 | } | |
4252 | ||
5d13a37b AJ |
4253 | trans = btrfs_join_transaction(root); |
4254 | if (IS_ERR(trans)) { | |
4255 | ret = PTR_ERR(trans); | |
4256 | goto out; | |
4257 | } | |
4258 | ||
4259 | /* FIXME: check if the IDs really exist */ | |
4260 | if (sa->create) { | |
4261 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid, | |
4262 | NULL); | |
4263 | } else { | |
4264 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
4265 | } | |
4266 | ||
4267 | err = btrfs_end_transaction(trans, root); | |
4268 | if (err && !ret) | |
4269 | ret = err; | |
4270 | ||
4271 | out: | |
4272 | kfree(sa); | |
905b0dda MX |
4273 | drop_write: |
4274 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4275 | return ret; |
4276 | } | |
4277 | ||
905b0dda | 4278 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4279 | { |
496ad9aa | 4280 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4281 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4282 | struct btrfs_trans_handle *trans; | |
4283 | int ret; | |
4284 | int err; | |
4285 | u64 qgroupid; | |
4286 | ||
4287 | if (!capable(CAP_SYS_ADMIN)) | |
4288 | return -EPERM; | |
4289 | ||
905b0dda MX |
4290 | ret = mnt_want_write_file(file); |
4291 | if (ret) | |
4292 | return ret; | |
5d13a37b AJ |
4293 | |
4294 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4295 | if (IS_ERR(sa)) { |
4296 | ret = PTR_ERR(sa); | |
4297 | goto drop_write; | |
4298 | } | |
5d13a37b AJ |
4299 | |
4300 | trans = btrfs_join_transaction(root); | |
4301 | if (IS_ERR(trans)) { | |
4302 | ret = PTR_ERR(trans); | |
4303 | goto out; | |
4304 | } | |
4305 | ||
4306 | qgroupid = sa->qgroupid; | |
4307 | if (!qgroupid) { | |
4308 | /* take the current subvol as qgroup */ | |
4309 | qgroupid = root->root_key.objectid; | |
4310 | } | |
4311 | ||
4312 | /* FIXME: check if the IDs really exist */ | |
4313 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
4314 | ||
4315 | err = btrfs_end_transaction(trans, root); | |
4316 | if (err && !ret) | |
4317 | ret = err; | |
4318 | ||
4319 | out: | |
4320 | kfree(sa); | |
905b0dda MX |
4321 | drop_write: |
4322 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4323 | return ret; |
4324 | } | |
4325 | ||
2f232036 JS |
4326 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
4327 | { | |
6d0379ec | 4328 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4329 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4330 | int ret; | |
4331 | ||
4332 | if (!capable(CAP_SYS_ADMIN)) | |
4333 | return -EPERM; | |
4334 | ||
4335 | ret = mnt_want_write_file(file); | |
4336 | if (ret) | |
4337 | return ret; | |
4338 | ||
4339 | qsa = memdup_user(arg, sizeof(*qsa)); | |
4340 | if (IS_ERR(qsa)) { | |
4341 | ret = PTR_ERR(qsa); | |
4342 | goto drop_write; | |
4343 | } | |
4344 | ||
4345 | if (qsa->flags) { | |
4346 | ret = -EINVAL; | |
4347 | goto out; | |
4348 | } | |
4349 | ||
4350 | ret = btrfs_qgroup_rescan(root->fs_info); | |
4351 | ||
4352 | out: | |
4353 | kfree(qsa); | |
4354 | drop_write: | |
4355 | mnt_drop_write_file(file); | |
4356 | return ret; | |
4357 | } | |
4358 | ||
4359 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
4360 | { | |
6d0379ec | 4361 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4362 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4363 | int ret = 0; | |
4364 | ||
4365 | if (!capable(CAP_SYS_ADMIN)) | |
4366 | return -EPERM; | |
4367 | ||
4368 | qsa = kzalloc(sizeof(*qsa), GFP_NOFS); | |
4369 | if (!qsa) | |
4370 | return -ENOMEM; | |
4371 | ||
4372 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
4373 | qsa->flags = 1; | |
4374 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; | |
4375 | } | |
4376 | ||
4377 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
4378 | ret = -EFAULT; | |
4379 | ||
4380 | kfree(qsa); | |
4381 | return ret; | |
4382 | } | |
4383 | ||
57254b6e JS |
4384 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
4385 | { | |
54563d41 | 4386 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
57254b6e JS |
4387 | |
4388 | if (!capable(CAP_SYS_ADMIN)) | |
4389 | return -EPERM; | |
4390 | ||
4391 | return btrfs_qgroup_wait_for_completion(root->fs_info); | |
4392 | } | |
4393 | ||
8ea05e3a AB |
4394 | static long btrfs_ioctl_set_received_subvol(struct file *file, |
4395 | void __user *arg) | |
4396 | { | |
4397 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
496ad9aa | 4398 | struct inode *inode = file_inode(file); |
8ea05e3a AB |
4399 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4400 | struct btrfs_root_item *root_item = &root->root_item; | |
4401 | struct btrfs_trans_handle *trans; | |
4402 | struct timespec ct = CURRENT_TIME; | |
4403 | int ret = 0; | |
dd5f9615 | 4404 | int received_uuid_changed; |
8ea05e3a AB |
4405 | |
4406 | ret = mnt_want_write_file(file); | |
4407 | if (ret < 0) | |
4408 | return ret; | |
4409 | ||
4410 | down_write(&root->fs_info->subvol_sem); | |
4411 | ||
4412 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
4413 | ret = -EINVAL; | |
4414 | goto out; | |
4415 | } | |
4416 | ||
4417 | if (btrfs_root_readonly(root)) { | |
4418 | ret = -EROFS; | |
4419 | goto out; | |
4420 | } | |
4421 | ||
4422 | if (!inode_owner_or_capable(inode)) { | |
4423 | ret = -EACCES; | |
4424 | goto out; | |
4425 | } | |
4426 | ||
4427 | sa = memdup_user(arg, sizeof(*sa)); | |
4428 | if (IS_ERR(sa)) { | |
4429 | ret = PTR_ERR(sa); | |
4430 | sa = NULL; | |
4431 | goto out; | |
4432 | } | |
4433 | ||
dd5f9615 SB |
4434 | /* |
4435 | * 1 - root item | |
4436 | * 2 - uuid items (received uuid + subvol uuid) | |
4437 | */ | |
4438 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
4439 | if (IS_ERR(trans)) { |
4440 | ret = PTR_ERR(trans); | |
4441 | trans = NULL; | |
4442 | goto out; | |
4443 | } | |
4444 | ||
4445 | sa->rtransid = trans->transid; | |
4446 | sa->rtime.sec = ct.tv_sec; | |
4447 | sa->rtime.nsec = ct.tv_nsec; | |
4448 | ||
dd5f9615 SB |
4449 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
4450 | BTRFS_UUID_SIZE); | |
4451 | if (received_uuid_changed && | |
4452 | !btrfs_is_empty_uuid(root_item->received_uuid)) | |
4453 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
4454 | root_item->received_uuid, | |
4455 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4456 | root->root_key.objectid); | |
8ea05e3a AB |
4457 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
4458 | btrfs_set_root_stransid(root_item, sa->stransid); | |
4459 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
4460 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
4461 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
4462 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
4463 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a AB |
4464 | |
4465 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
4466 | &root->root_key, &root->root_item); | |
4467 | if (ret < 0) { | |
4468 | btrfs_end_transaction(trans, root); | |
8ea05e3a | 4469 | goto out; |
dd5f9615 SB |
4470 | } |
4471 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
4472 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, | |
4473 | sa->uuid, | |
4474 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
4475 | root->root_key.objectid); | |
4476 | if (ret < 0 && ret != -EEXIST) { | |
4477 | btrfs_abort_transaction(trans, root, ret); | |
8ea05e3a | 4478 | goto out; |
dd5f9615 SB |
4479 | } |
4480 | } | |
4481 | ret = btrfs_commit_transaction(trans, root); | |
4482 | if (ret < 0) { | |
4483 | btrfs_abort_transaction(trans, root, ret); | |
4484 | goto out; | |
8ea05e3a AB |
4485 | } |
4486 | ||
4487 | ret = copy_to_user(arg, sa, sizeof(*sa)); | |
4488 | if (ret) | |
4489 | ret = -EFAULT; | |
4490 | ||
4491 | out: | |
4492 | kfree(sa); | |
4493 | up_write(&root->fs_info->subvol_sem); | |
4494 | mnt_drop_write_file(file); | |
4495 | return ret; | |
4496 | } | |
4497 | ||
867ab667 | 4498 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
4499 | { | |
6d0379ec | 4500 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a1b83ac5 | 4501 | size_t len; |
867ab667 | 4502 | int ret; |
a1b83ac5 AJ |
4503 | char label[BTRFS_LABEL_SIZE]; |
4504 | ||
4505 | spin_lock(&root->fs_info->super_lock); | |
4506 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
4507 | spin_unlock(&root->fs_info->super_lock); | |
4508 | ||
4509 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 4510 | |
4511 | if (len == BTRFS_LABEL_SIZE) { | |
efe120a0 FH |
4512 | btrfs_warn(root->fs_info, |
4513 | "label is too long, return the first %zu bytes", --len); | |
867ab667 | 4514 | } |
4515 | ||
867ab667 | 4516 | ret = copy_to_user(arg, label, len); |
867ab667 | 4517 | |
4518 | return ret ? -EFAULT : 0; | |
4519 | } | |
4520 | ||
a8bfd4ab | 4521 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
4522 | { | |
6d0379ec | 4523 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a8bfd4ab | 4524 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
4525 | struct btrfs_trans_handle *trans; | |
4526 | char label[BTRFS_LABEL_SIZE]; | |
4527 | int ret; | |
4528 | ||
4529 | if (!capable(CAP_SYS_ADMIN)) | |
4530 | return -EPERM; | |
4531 | ||
4532 | if (copy_from_user(label, arg, sizeof(label))) | |
4533 | return -EFAULT; | |
4534 | ||
4535 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
efe120a0 | 4536 | btrfs_err(root->fs_info, "unable to set label with more than %d bytes", |
a8bfd4ab | 4537 | BTRFS_LABEL_SIZE - 1); |
4538 | return -EINVAL; | |
4539 | } | |
4540 | ||
4541 | ret = mnt_want_write_file(file); | |
4542 | if (ret) | |
4543 | return ret; | |
4544 | ||
a8bfd4ab | 4545 | trans = btrfs_start_transaction(root, 0); |
4546 | if (IS_ERR(trans)) { | |
4547 | ret = PTR_ERR(trans); | |
4548 | goto out_unlock; | |
4549 | } | |
4550 | ||
a1b83ac5 | 4551 | spin_lock(&root->fs_info->super_lock); |
a8bfd4ab | 4552 | strcpy(super_block->label, label); |
a1b83ac5 | 4553 | spin_unlock(&root->fs_info->super_lock); |
a8bfd4ab | 4554 | ret = btrfs_end_transaction(trans, root); |
4555 | ||
4556 | out_unlock: | |
a8bfd4ab | 4557 | mnt_drop_write_file(file); |
4558 | return ret; | |
4559 | } | |
4560 | ||
2eaa055f JM |
4561 | #define INIT_FEATURE_FLAGS(suffix) \ |
4562 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
4563 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
4564 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
4565 | ||
4566 | static int btrfs_ioctl_get_supported_features(struct file *file, | |
4567 | void __user *arg) | |
4568 | { | |
4569 | static struct btrfs_ioctl_feature_flags features[3] = { | |
4570 | INIT_FEATURE_FLAGS(SUPP), | |
4571 | INIT_FEATURE_FLAGS(SAFE_SET), | |
4572 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
4573 | }; | |
4574 | ||
4575 | if (copy_to_user(arg, &features, sizeof(features))) | |
4576 | return -EFAULT; | |
4577 | ||
4578 | return 0; | |
4579 | } | |
4580 | ||
4581 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) | |
4582 | { | |
4583 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
4584 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
4585 | struct btrfs_ioctl_feature_flags features; | |
4586 | ||
4587 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
4588 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
4589 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
4590 | ||
4591 | if (copy_to_user(arg, &features, sizeof(features))) | |
4592 | return -EFAULT; | |
4593 | ||
4594 | return 0; | |
4595 | } | |
4596 | ||
3b02a68a JM |
4597 | static int check_feature_bits(struct btrfs_root *root, |
4598 | enum btrfs_feature_set set, | |
2eaa055f JM |
4599 | u64 change_mask, u64 flags, u64 supported_flags, |
4600 | u64 safe_set, u64 safe_clear) | |
4601 | { | |
3b02a68a JM |
4602 | const char *type = btrfs_feature_set_names[set]; |
4603 | char *names; | |
2eaa055f JM |
4604 | u64 disallowed, unsupported; |
4605 | u64 set_mask = flags & change_mask; | |
4606 | u64 clear_mask = ~flags & change_mask; | |
4607 | ||
4608 | unsupported = set_mask & ~supported_flags; | |
4609 | if (unsupported) { | |
3b02a68a JM |
4610 | names = btrfs_printable_features(set, unsupported); |
4611 | if (names) { | |
4612 | btrfs_warn(root->fs_info, | |
4613 | "this kernel does not support the %s feature bit%s", | |
4614 | names, strchr(names, ',') ? "s" : ""); | |
4615 | kfree(names); | |
4616 | } else | |
4617 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
4618 | "this kernel does not support %s bits 0x%llx", |
4619 | type, unsupported); | |
4620 | return -EOPNOTSUPP; | |
4621 | } | |
4622 | ||
4623 | disallowed = set_mask & ~safe_set; | |
4624 | if (disallowed) { | |
3b02a68a JM |
4625 | names = btrfs_printable_features(set, disallowed); |
4626 | if (names) { | |
4627 | btrfs_warn(root->fs_info, | |
4628 | "can't set the %s feature bit%s while mounted", | |
4629 | names, strchr(names, ',') ? "s" : ""); | |
4630 | kfree(names); | |
4631 | } else | |
4632 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
4633 | "can't set %s bits 0x%llx while mounted", |
4634 | type, disallowed); | |
4635 | return -EPERM; | |
4636 | } | |
4637 | ||
4638 | disallowed = clear_mask & ~safe_clear; | |
4639 | if (disallowed) { | |
3b02a68a JM |
4640 | names = btrfs_printable_features(set, disallowed); |
4641 | if (names) { | |
4642 | btrfs_warn(root->fs_info, | |
4643 | "can't clear the %s feature bit%s while mounted", | |
4644 | names, strchr(names, ',') ? "s" : ""); | |
4645 | kfree(names); | |
4646 | } else | |
4647 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
4648 | "can't clear %s bits 0x%llx while mounted", |
4649 | type, disallowed); | |
4650 | return -EPERM; | |
4651 | } | |
4652 | ||
4653 | return 0; | |
4654 | } | |
4655 | ||
4656 | #define check_feature(root, change_mask, flags, mask_base) \ | |
3b02a68a | 4657 | check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ |
2eaa055f JM |
4658 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
4659 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
4660 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
4661 | ||
4662 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
4663 | { | |
4664 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
4665 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
4666 | struct btrfs_ioctl_feature_flags flags[2]; | |
4667 | struct btrfs_trans_handle *trans; | |
4668 | u64 newflags; | |
4669 | int ret; | |
4670 | ||
4671 | if (!capable(CAP_SYS_ADMIN)) | |
4672 | return -EPERM; | |
4673 | ||
4674 | if (copy_from_user(flags, arg, sizeof(flags))) | |
4675 | return -EFAULT; | |
4676 | ||
4677 | /* Nothing to do */ | |
4678 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
4679 | !flags[0].incompat_flags) | |
4680 | return 0; | |
4681 | ||
4682 | ret = check_feature(root, flags[0].compat_flags, | |
4683 | flags[1].compat_flags, COMPAT); | |
4684 | if (ret) | |
4685 | return ret; | |
4686 | ||
4687 | ret = check_feature(root, flags[0].compat_ro_flags, | |
4688 | flags[1].compat_ro_flags, COMPAT_RO); | |
4689 | if (ret) | |
4690 | return ret; | |
4691 | ||
4692 | ret = check_feature(root, flags[0].incompat_flags, | |
4693 | flags[1].incompat_flags, INCOMPAT); | |
4694 | if (ret) | |
4695 | return ret; | |
4696 | ||
4697 | trans = btrfs_start_transaction(root, 1); | |
4698 | if (IS_ERR(trans)) | |
4699 | return PTR_ERR(trans); | |
4700 | ||
4701 | spin_lock(&root->fs_info->super_lock); | |
4702 | newflags = btrfs_super_compat_flags(super_block); | |
4703 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
4704 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
4705 | btrfs_set_super_compat_flags(super_block, newflags); | |
4706 | ||
4707 | newflags = btrfs_super_compat_ro_flags(super_block); | |
4708 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
4709 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
4710 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
4711 | ||
4712 | newflags = btrfs_super_incompat_flags(super_block); | |
4713 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
4714 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
4715 | btrfs_set_super_incompat_flags(super_block, newflags); | |
4716 | spin_unlock(&root->fs_info->super_lock); | |
4717 | ||
4718 | return btrfs_end_transaction(trans, root); | |
4719 | } | |
4720 | ||
f46b5a66 CH |
4721 | long btrfs_ioctl(struct file *file, unsigned int |
4722 | cmd, unsigned long arg) | |
4723 | { | |
496ad9aa | 4724 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
4bcabaa3 | 4725 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
4726 | |
4727 | switch (cmd) { | |
6cbff00f CH |
4728 | case FS_IOC_GETFLAGS: |
4729 | return btrfs_ioctl_getflags(file, argp); | |
4730 | case FS_IOC_SETFLAGS: | |
4731 | return btrfs_ioctl_setflags(file, argp); | |
4732 | case FS_IOC_GETVERSION: | |
4733 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
4734 | case FITRIM: |
4735 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 4736 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 4737 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 4738 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 4739 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 4740 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 4741 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
4742 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
4743 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
4744 | case BTRFS_IOC_SNAP_DESTROY: |
4745 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
4746 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
4747 | return btrfs_ioctl_subvol_getflags(file, argp); | |
4748 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
4749 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
4750 | case BTRFS_IOC_DEFAULT_SUBVOL: |
4751 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 4752 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
4753 | return btrfs_ioctl_defrag(file, NULL); |
4754 | case BTRFS_IOC_DEFRAG_RANGE: | |
4755 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 4756 | case BTRFS_IOC_RESIZE: |
198605a8 | 4757 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 4758 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 4759 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 4760 | case BTRFS_IOC_RM_DEV: |
da24927b | 4761 | return btrfs_ioctl_rm_dev(file, argp); |
475f6387 JS |
4762 | case BTRFS_IOC_FS_INFO: |
4763 | return btrfs_ioctl_fs_info(root, argp); | |
4764 | case BTRFS_IOC_DEV_INFO: | |
4765 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 4766 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 4767 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 | 4768 | case BTRFS_IOC_CLONE: |
c5c9cd4d SW |
4769 | return btrfs_ioctl_clone(file, arg, 0, 0, 0); |
4770 | case BTRFS_IOC_CLONE_RANGE: | |
7a865e8a | 4771 | return btrfs_ioctl_clone_range(file, argp); |
f46b5a66 CH |
4772 | case BTRFS_IOC_TRANS_START: |
4773 | return btrfs_ioctl_trans_start(file); | |
4774 | case BTRFS_IOC_TRANS_END: | |
4775 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
4776 | case BTRFS_IOC_TREE_SEARCH: |
4777 | return btrfs_ioctl_tree_search(file, argp); | |
4778 | case BTRFS_IOC_INO_LOOKUP: | |
4779 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
4780 | case BTRFS_IOC_INO_PATHS: |
4781 | return btrfs_ioctl_ino_to_path(root, argp); | |
4782 | case BTRFS_IOC_LOGICAL_INO: | |
4783 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
4784 | case BTRFS_IOC_SPACE_INFO: |
4785 | return btrfs_ioctl_space_info(root, argp); | |
01e219e8 JM |
4786 | case BTRFS_IOC_GLOBAL_RSV: |
4787 | return btrfs_ioctl_global_rsv(root, argp); | |
9b199859 FDBM |
4788 | case BTRFS_IOC_SYNC: { |
4789 | int ret; | |
4790 | ||
91aef86f | 4791 | ret = btrfs_start_delalloc_roots(root->fs_info, 0); |
9b199859 FDBM |
4792 | if (ret) |
4793 | return ret; | |
4794 | ret = btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
4795 | return ret; | |
4796 | } | |
46204592 | 4797 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 4798 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 4799 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 4800 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 | 4801 | case BTRFS_IOC_SCRUB: |
b8e95489 | 4802 | return btrfs_ioctl_scrub(file, argp); |
475f6387 JS |
4803 | case BTRFS_IOC_SCRUB_CANCEL: |
4804 | return btrfs_ioctl_scrub_cancel(root, argp); | |
4805 | case BTRFS_IOC_SCRUB_PROGRESS: | |
4806 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 4807 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 4808 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
4809 | case BTRFS_IOC_BALANCE_CTL: |
4810 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
4811 | case BTRFS_IOC_BALANCE_PROGRESS: |
4812 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
4813 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
4814 | return btrfs_ioctl_set_received_subvol(file, argp); | |
31db9f7c AB |
4815 | case BTRFS_IOC_SEND: |
4816 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 4817 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 4818 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b | 4819 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 4820 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 4821 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 4822 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 4823 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 4824 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 4825 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 4826 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
4827 | case BTRFS_IOC_QUOTA_RESCAN: |
4828 | return btrfs_ioctl_quota_rescan(file, argp); | |
4829 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
4830 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
4831 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
4832 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd SB |
4833 | case BTRFS_IOC_DEV_REPLACE: |
4834 | return btrfs_ioctl_dev_replace(root, argp); | |
867ab667 | 4835 | case BTRFS_IOC_GET_FSLABEL: |
4836 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 4837 | case BTRFS_IOC_SET_FSLABEL: |
4838 | return btrfs_ioctl_set_fslabel(file, argp); | |
416161db MF |
4839 | case BTRFS_IOC_FILE_EXTENT_SAME: |
4840 | return btrfs_ioctl_file_extent_same(file, argp); | |
2eaa055f JM |
4841 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
4842 | return btrfs_ioctl_get_supported_features(file, argp); | |
4843 | case BTRFS_IOC_GET_FEATURES: | |
4844 | return btrfs_ioctl_get_features(file, argp); | |
4845 | case BTRFS_IOC_SET_FEATURES: | |
4846 | return btrfs_ioctl_set_features(file, argp); | |
f46b5a66 CH |
4847 | } |
4848 | ||
4849 | return -ENOTTY; | |
4850 | } |