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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" |
fcebe456 | 61 | #include "qgroup.h" |
f46b5a66 | 62 | |
abccd00f HM |
63 | #ifdef CONFIG_64BIT |
64 | /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI | |
65 | * structures are incorrect, as the timespec structure from userspace | |
66 | * is 4 bytes too small. We define these alternatives here to teach | |
67 | * the kernel about the 32-bit struct packing. | |
68 | */ | |
69 | struct btrfs_ioctl_timespec_32 { | |
70 | __u64 sec; | |
71 | __u32 nsec; | |
72 | } __attribute__ ((__packed__)); | |
73 | ||
74 | struct btrfs_ioctl_received_subvol_args_32 { | |
75 | char uuid[BTRFS_UUID_SIZE]; /* in */ | |
76 | __u64 stransid; /* in */ | |
77 | __u64 rtransid; /* out */ | |
78 | struct btrfs_ioctl_timespec_32 stime; /* in */ | |
79 | struct btrfs_ioctl_timespec_32 rtime; /* out */ | |
80 | __u64 flags; /* in */ | |
81 | __u64 reserved[16]; /* in */ | |
82 | } __attribute__ ((__packed__)); | |
83 | ||
84 | #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \ | |
85 | struct btrfs_ioctl_received_subvol_args_32) | |
86 | #endif | |
87 | ||
88 | ||
416161db | 89 | static int btrfs_clone(struct inode *src, struct inode *inode, |
1c919a5e MF |
90 | u64 off, u64 olen, u64 olen_aligned, u64 destoff, |
91 | int no_time_update); | |
416161db | 92 | |
6cbff00f CH |
93 | /* Mask out flags that are inappropriate for the given type of inode. */ |
94 | static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) | |
95 | { | |
96 | if (S_ISDIR(mode)) | |
97 | return flags; | |
98 | else if (S_ISREG(mode)) | |
99 | return flags & ~FS_DIRSYNC_FL; | |
100 | else | |
101 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); | |
102 | } | |
103 | ||
104 | /* | |
105 | * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. | |
106 | */ | |
107 | static unsigned int btrfs_flags_to_ioctl(unsigned int flags) | |
108 | { | |
109 | unsigned int iflags = 0; | |
110 | ||
111 | if (flags & BTRFS_INODE_SYNC) | |
112 | iflags |= FS_SYNC_FL; | |
113 | if (flags & BTRFS_INODE_IMMUTABLE) | |
114 | iflags |= FS_IMMUTABLE_FL; | |
115 | if (flags & BTRFS_INODE_APPEND) | |
116 | iflags |= FS_APPEND_FL; | |
117 | if (flags & BTRFS_INODE_NODUMP) | |
118 | iflags |= FS_NODUMP_FL; | |
119 | if (flags & BTRFS_INODE_NOATIME) | |
120 | iflags |= FS_NOATIME_FL; | |
121 | if (flags & BTRFS_INODE_DIRSYNC) | |
122 | iflags |= FS_DIRSYNC_FL; | |
d0092bdd LZ |
123 | if (flags & BTRFS_INODE_NODATACOW) |
124 | iflags |= FS_NOCOW_FL; | |
125 | ||
126 | if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS)) | |
127 | iflags |= FS_COMPR_FL; | |
128 | else if (flags & BTRFS_INODE_NOCOMPRESS) | |
129 | iflags |= FS_NOCOMP_FL; | |
6cbff00f CH |
130 | |
131 | return iflags; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Update inode->i_flags based on the btrfs internal flags. | |
136 | */ | |
137 | void btrfs_update_iflags(struct inode *inode) | |
138 | { | |
139 | struct btrfs_inode *ip = BTRFS_I(inode); | |
3cc79392 | 140 | unsigned int new_fl = 0; |
6cbff00f CH |
141 | |
142 | if (ip->flags & BTRFS_INODE_SYNC) | |
3cc79392 | 143 | new_fl |= S_SYNC; |
6cbff00f | 144 | if (ip->flags & BTRFS_INODE_IMMUTABLE) |
3cc79392 | 145 | new_fl |= S_IMMUTABLE; |
6cbff00f | 146 | if (ip->flags & BTRFS_INODE_APPEND) |
3cc79392 | 147 | new_fl |= S_APPEND; |
6cbff00f | 148 | if (ip->flags & BTRFS_INODE_NOATIME) |
3cc79392 | 149 | new_fl |= S_NOATIME; |
6cbff00f | 150 | if (ip->flags & BTRFS_INODE_DIRSYNC) |
3cc79392 FM |
151 | new_fl |= S_DIRSYNC; |
152 | ||
153 | set_mask_bits(&inode->i_flags, | |
154 | S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC, | |
155 | new_fl); | |
6cbff00f CH |
156 | } |
157 | ||
158 | /* | |
159 | * Inherit flags from the parent inode. | |
160 | * | |
e27425d6 | 161 | * Currently only the compression flags and the cow flags are inherited. |
6cbff00f CH |
162 | */ |
163 | void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) | |
164 | { | |
0b4dcea5 CM |
165 | unsigned int flags; |
166 | ||
167 | if (!dir) | |
168 | return; | |
169 | ||
170 | flags = BTRFS_I(dir)->flags; | |
6cbff00f | 171 | |
e27425d6 JB |
172 | if (flags & BTRFS_INODE_NOCOMPRESS) { |
173 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS; | |
174 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; | |
175 | } else if (flags & BTRFS_INODE_COMPRESS) { | |
176 | BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
177 | BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; | |
178 | } | |
179 | ||
213490b3 | 180 | if (flags & BTRFS_INODE_NODATACOW) { |
e27425d6 | 181 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
213490b3 LB |
182 | if (S_ISREG(inode->i_mode)) |
183 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
184 | } | |
6cbff00f | 185 | |
6cbff00f CH |
186 | btrfs_update_iflags(inode); |
187 | } | |
188 | ||
189 | static int btrfs_ioctl_getflags(struct file *file, void __user *arg) | |
190 | { | |
496ad9aa | 191 | struct btrfs_inode *ip = BTRFS_I(file_inode(file)); |
6cbff00f CH |
192 | unsigned int flags = btrfs_flags_to_ioctl(ip->flags); |
193 | ||
194 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
195 | return -EFAULT; | |
196 | return 0; | |
197 | } | |
198 | ||
75e7cb7f LB |
199 | static int check_flags(unsigned int flags) |
200 | { | |
201 | if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ | |
202 | FS_NOATIME_FL | FS_NODUMP_FL | \ | |
203 | FS_SYNC_FL | FS_DIRSYNC_FL | \ | |
e1e8fb6a LZ |
204 | FS_NOCOMP_FL | FS_COMPR_FL | |
205 | FS_NOCOW_FL)) | |
75e7cb7f LB |
206 | return -EOPNOTSUPP; |
207 | ||
208 | if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) | |
209 | return -EINVAL; | |
210 | ||
75e7cb7f LB |
211 | return 0; |
212 | } | |
213 | ||
6cbff00f CH |
214 | static int btrfs_ioctl_setflags(struct file *file, void __user *arg) |
215 | { | |
496ad9aa | 216 | struct inode *inode = file_inode(file); |
6cbff00f CH |
217 | struct btrfs_inode *ip = BTRFS_I(inode); |
218 | struct btrfs_root *root = ip->root; | |
219 | struct btrfs_trans_handle *trans; | |
220 | unsigned int flags, oldflags; | |
221 | int ret; | |
f062abf0 LZ |
222 | u64 ip_oldflags; |
223 | unsigned int i_oldflags; | |
7e97b8da | 224 | umode_t mode; |
6cbff00f | 225 | |
bd60ea0f DS |
226 | if (!inode_owner_or_capable(inode)) |
227 | return -EPERM; | |
228 | ||
b83cc969 LZ |
229 | if (btrfs_root_readonly(root)) |
230 | return -EROFS; | |
231 | ||
6cbff00f CH |
232 | if (copy_from_user(&flags, arg, sizeof(flags))) |
233 | return -EFAULT; | |
234 | ||
75e7cb7f LB |
235 | ret = check_flags(flags); |
236 | if (ret) | |
237 | return ret; | |
f46b5a66 | 238 | |
e7848683 JK |
239 | ret = mnt_want_write_file(file); |
240 | if (ret) | |
241 | return ret; | |
242 | ||
5955102c | 243 | inode_lock(inode); |
6cbff00f | 244 | |
f062abf0 LZ |
245 | ip_oldflags = ip->flags; |
246 | i_oldflags = inode->i_flags; | |
7e97b8da | 247 | mode = inode->i_mode; |
f062abf0 | 248 | |
6cbff00f CH |
249 | flags = btrfs_mask_flags(inode->i_mode, flags); |
250 | oldflags = btrfs_flags_to_ioctl(ip->flags); | |
251 | if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { | |
252 | if (!capable(CAP_LINUX_IMMUTABLE)) { | |
253 | ret = -EPERM; | |
254 | goto out_unlock; | |
255 | } | |
256 | } | |
257 | ||
6cbff00f CH |
258 | if (flags & FS_SYNC_FL) |
259 | ip->flags |= BTRFS_INODE_SYNC; | |
260 | else | |
261 | ip->flags &= ~BTRFS_INODE_SYNC; | |
262 | if (flags & FS_IMMUTABLE_FL) | |
263 | ip->flags |= BTRFS_INODE_IMMUTABLE; | |
264 | else | |
265 | ip->flags &= ~BTRFS_INODE_IMMUTABLE; | |
266 | if (flags & FS_APPEND_FL) | |
267 | ip->flags |= BTRFS_INODE_APPEND; | |
268 | else | |
269 | ip->flags &= ~BTRFS_INODE_APPEND; | |
270 | if (flags & FS_NODUMP_FL) | |
271 | ip->flags |= BTRFS_INODE_NODUMP; | |
272 | else | |
273 | ip->flags &= ~BTRFS_INODE_NODUMP; | |
274 | if (flags & FS_NOATIME_FL) | |
275 | ip->flags |= BTRFS_INODE_NOATIME; | |
276 | else | |
277 | ip->flags &= ~BTRFS_INODE_NOATIME; | |
278 | if (flags & FS_DIRSYNC_FL) | |
279 | ip->flags |= BTRFS_INODE_DIRSYNC; | |
280 | else | |
281 | ip->flags &= ~BTRFS_INODE_DIRSYNC; | |
7e97b8da DS |
282 | if (flags & FS_NOCOW_FL) { |
283 | if (S_ISREG(mode)) { | |
284 | /* | |
285 | * It's safe to turn csums off here, no extents exist. | |
286 | * Otherwise we want the flag to reflect the real COW | |
287 | * status of the file and will not set it. | |
288 | */ | |
289 | if (inode->i_size == 0) | |
290 | ip->flags |= BTRFS_INODE_NODATACOW | |
291 | | BTRFS_INODE_NODATASUM; | |
292 | } else { | |
293 | ip->flags |= BTRFS_INODE_NODATACOW; | |
294 | } | |
295 | } else { | |
296 | /* | |
297 | * Revert back under same assuptions as above | |
298 | */ | |
299 | if (S_ISREG(mode)) { | |
300 | if (inode->i_size == 0) | |
301 | ip->flags &= ~(BTRFS_INODE_NODATACOW | |
302 | | BTRFS_INODE_NODATASUM); | |
303 | } else { | |
304 | ip->flags &= ~BTRFS_INODE_NODATACOW; | |
305 | } | |
306 | } | |
6cbff00f | 307 | |
75e7cb7f LB |
308 | /* |
309 | * The COMPRESS flag can only be changed by users, while the NOCOMPRESS | |
310 | * flag may be changed automatically if compression code won't make | |
311 | * things smaller. | |
312 | */ | |
313 | if (flags & FS_NOCOMP_FL) { | |
314 | ip->flags &= ~BTRFS_INODE_COMPRESS; | |
315 | ip->flags |= BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
316 | |
317 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); | |
318 | if (ret && ret != -ENODATA) | |
319 | goto out_drop; | |
75e7cb7f | 320 | } else if (flags & FS_COMPR_FL) { |
63541927 FDBM |
321 | const char *comp; |
322 | ||
75e7cb7f LB |
323 | ip->flags |= BTRFS_INODE_COMPRESS; |
324 | ip->flags &= ~BTRFS_INODE_NOCOMPRESS; | |
63541927 FDBM |
325 | |
326 | if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO) | |
327 | comp = "lzo"; | |
328 | else | |
329 | comp = "zlib"; | |
330 | ret = btrfs_set_prop(inode, "btrfs.compression", | |
331 | comp, strlen(comp), 0); | |
332 | if (ret) | |
333 | goto out_drop; | |
334 | ||
ebcb904d | 335 | } else { |
78a017a2 FM |
336 | ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0); |
337 | if (ret && ret != -ENODATA) | |
338 | goto out_drop; | |
ebcb904d | 339 | ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS); |
75e7cb7f | 340 | } |
6cbff00f | 341 | |
4da6f1a3 | 342 | trans = btrfs_start_transaction(root, 1); |
f062abf0 LZ |
343 | if (IS_ERR(trans)) { |
344 | ret = PTR_ERR(trans); | |
345 | goto out_drop; | |
346 | } | |
6cbff00f | 347 | |
306424cc | 348 | btrfs_update_iflags(inode); |
0c4d2d95 | 349 | inode_inc_iversion(inode); |
04b285f3 | 350 | inode->i_ctime = current_fs_time(inode->i_sb); |
6cbff00f | 351 | ret = btrfs_update_inode(trans, root, inode); |
6cbff00f | 352 | |
6cbff00f | 353 | btrfs_end_transaction(trans, root); |
f062abf0 LZ |
354 | out_drop: |
355 | if (ret) { | |
356 | ip->flags = ip_oldflags; | |
357 | inode->i_flags = i_oldflags; | |
358 | } | |
6cbff00f | 359 | |
6cbff00f | 360 | out_unlock: |
5955102c | 361 | inode_unlock(inode); |
e7848683 | 362 | mnt_drop_write_file(file); |
2d4e6f6a | 363 | return ret; |
6cbff00f CH |
364 | } |
365 | ||
366 | static int btrfs_ioctl_getversion(struct file *file, int __user *arg) | |
367 | { | |
496ad9aa | 368 | struct inode *inode = file_inode(file); |
6cbff00f CH |
369 | |
370 | return put_user(inode->i_generation, arg); | |
371 | } | |
f46b5a66 | 372 | |
f7039b1d LD |
373 | static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) |
374 | { | |
54563d41 | 375 | struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb); |
f7039b1d LD |
376 | struct btrfs_device *device; |
377 | struct request_queue *q; | |
378 | struct fstrim_range range; | |
379 | u64 minlen = ULLONG_MAX; | |
380 | u64 num_devices = 0; | |
815745cf | 381 | u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy); |
f7039b1d LD |
382 | int ret; |
383 | ||
384 | if (!capable(CAP_SYS_ADMIN)) | |
385 | return -EPERM; | |
386 | ||
1f78160c XG |
387 | rcu_read_lock(); |
388 | list_for_each_entry_rcu(device, &fs_info->fs_devices->devices, | |
389 | dev_list) { | |
f7039b1d LD |
390 | if (!device->bdev) |
391 | continue; | |
392 | q = bdev_get_queue(device->bdev); | |
393 | if (blk_queue_discard(q)) { | |
394 | num_devices++; | |
395 | minlen = min((u64)q->limits.discard_granularity, | |
396 | minlen); | |
397 | } | |
398 | } | |
1f78160c | 399 | rcu_read_unlock(); |
f4c697e6 | 400 | |
f7039b1d LD |
401 | if (!num_devices) |
402 | return -EOPNOTSUPP; | |
f7039b1d LD |
403 | if (copy_from_user(&range, arg, sizeof(range))) |
404 | return -EFAULT; | |
e515c18b LC |
405 | if (range.start > total_bytes || |
406 | range.len < fs_info->sb->s_blocksize) | |
f4c697e6 | 407 | return -EINVAL; |
f7039b1d | 408 | |
f4c697e6 | 409 | range.len = min(range.len, total_bytes - range.start); |
f7039b1d | 410 | range.minlen = max(range.minlen, minlen); |
815745cf | 411 | ret = btrfs_trim_fs(fs_info->tree_root, &range); |
f7039b1d LD |
412 | if (ret < 0) |
413 | return ret; | |
414 | ||
415 | if (copy_to_user(arg, &range, sizeof(range))) | |
416 | return -EFAULT; | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
dd5f9615 SB |
421 | int btrfs_is_empty_uuid(u8 *uuid) |
422 | { | |
46e0f66a CM |
423 | int i; |
424 | ||
425 | for (i = 0; i < BTRFS_UUID_SIZE; i++) { | |
426 | if (uuid[i]) | |
427 | return 0; | |
428 | } | |
429 | return 1; | |
dd5f9615 SB |
430 | } |
431 | ||
d5c12070 | 432 | static noinline int create_subvol(struct inode *dir, |
cb8e7090 | 433 | struct dentry *dentry, |
72fd032e | 434 | char *name, int namelen, |
6f72c7e2 | 435 | u64 *async_transid, |
8696c533 | 436 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 CH |
437 | { |
438 | struct btrfs_trans_handle *trans; | |
439 | struct btrfs_key key; | |
440 | struct btrfs_root_item root_item; | |
441 | struct btrfs_inode_item *inode_item; | |
442 | struct extent_buffer *leaf; | |
d5c12070 | 443 | struct btrfs_root *root = BTRFS_I(dir)->root; |
76dda93c | 444 | struct btrfs_root *new_root; |
d5c12070 | 445 | struct btrfs_block_rsv block_rsv; |
04b285f3 | 446 | struct timespec cur_time = current_fs_time(dir->i_sb); |
5662344b | 447 | struct inode *inode; |
f46b5a66 CH |
448 | int ret; |
449 | int err; | |
450 | u64 objectid; | |
451 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
3de4586c | 452 | u64 index = 0; |
d5c12070 | 453 | u64 qgroup_reserved; |
8ea05e3a | 454 | uuid_le new_uuid; |
f46b5a66 | 455 | |
581bb050 | 456 | ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid); |
2fbe8c8a | 457 | if (ret) |
a22285a6 | 458 | return ret; |
6a912213 | 459 | |
e09fe2d2 QW |
460 | /* |
461 | * Don't create subvolume whose level is not zero. Or qgroup will be | |
462 | * screwed up since it assume subvolme qgroup's level to be 0. | |
463 | */ | |
464 | if (btrfs_qgroup_level(objectid)) | |
465 | return -ENOSPC; | |
466 | ||
d5c12070 | 467 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
9ed74f2d | 468 | /* |
d5c12070 MX |
469 | * The same as the snapshot creation, please see the comment |
470 | * of create_snapshot(). | |
9ed74f2d | 471 | */ |
d5c12070 | 472 | ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, |
dd5f9615 | 473 | 8, &qgroup_reserved, false); |
d5c12070 MX |
474 | if (ret) |
475 | return ret; | |
476 | ||
477 | trans = btrfs_start_transaction(root, 0); | |
478 | if (IS_ERR(trans)) { | |
479 | ret = PTR_ERR(trans); | |
de6e8200 LB |
480 | btrfs_subvolume_release_metadata(root, &block_rsv, |
481 | qgroup_reserved); | |
482 | return ret; | |
d5c12070 MX |
483 | } |
484 | trans->block_rsv = &block_rsv; | |
485 | trans->bytes_reserved = block_rsv.size; | |
f46b5a66 | 486 | |
8696c533 | 487 | ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit); |
6f72c7e2 AJ |
488 | if (ret) |
489 | goto fail; | |
490 | ||
4d75f8a9 | 491 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); |
8e8a1e31 JB |
492 | if (IS_ERR(leaf)) { |
493 | ret = PTR_ERR(leaf); | |
494 | goto fail; | |
495 | } | |
f46b5a66 | 496 | |
5d4f98a2 | 497 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
f46b5a66 CH |
498 | btrfs_set_header_bytenr(leaf, leaf->start); |
499 | btrfs_set_header_generation(leaf, trans->transid); | |
5d4f98a2 | 500 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); |
f46b5a66 CH |
501 | btrfs_set_header_owner(leaf, objectid); |
502 | ||
0a4e5586 | 503 | write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(), |
f46b5a66 | 504 | BTRFS_FSID_SIZE); |
5d4f98a2 | 505 | write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, |
b308bc2f | 506 | btrfs_header_chunk_tree_uuid(leaf), |
5d4f98a2 | 507 | BTRFS_UUID_SIZE); |
f46b5a66 CH |
508 | btrfs_mark_buffer_dirty(leaf); |
509 | ||
8ea05e3a AB |
510 | memset(&root_item, 0, sizeof(root_item)); |
511 | ||
f46b5a66 | 512 | inode_item = &root_item.inode; |
3cae210f QW |
513 | btrfs_set_stack_inode_generation(inode_item, 1); |
514 | btrfs_set_stack_inode_size(inode_item, 3); | |
515 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
707e8a07 | 516 | btrfs_set_stack_inode_nbytes(inode_item, root->nodesize); |
3cae210f | 517 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
f46b5a66 | 518 | |
3cae210f QW |
519 | btrfs_set_root_flags(&root_item, 0); |
520 | btrfs_set_root_limit(&root_item, 0); | |
521 | btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT); | |
08fe4db1 | 522 | |
f46b5a66 | 523 | btrfs_set_root_bytenr(&root_item, leaf->start); |
84234f3a | 524 | btrfs_set_root_generation(&root_item, trans->transid); |
f46b5a66 CH |
525 | btrfs_set_root_level(&root_item, 0); |
526 | btrfs_set_root_refs(&root_item, 1); | |
86b9f2ec | 527 | btrfs_set_root_used(&root_item, leaf->len); |
80ff3856 | 528 | btrfs_set_root_last_snapshot(&root_item, 0); |
f46b5a66 | 529 | |
8ea05e3a AB |
530 | btrfs_set_root_generation_v2(&root_item, |
531 | btrfs_root_generation(&root_item)); | |
532 | uuid_le_gen(&new_uuid); | |
533 | memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
3cae210f QW |
534 | btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec); |
535 | btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec); | |
8ea05e3a AB |
536 | root_item.ctime = root_item.otime; |
537 | btrfs_set_root_ctransid(&root_item, trans->transid); | |
538 | btrfs_set_root_otransid(&root_item, trans->transid); | |
f46b5a66 | 539 | |
925baedd | 540 | btrfs_tree_unlock(leaf); |
f46b5a66 CH |
541 | free_extent_buffer(leaf); |
542 | leaf = NULL; | |
543 | ||
544 | btrfs_set_root_dirid(&root_item, new_dirid); | |
545 | ||
546 | key.objectid = objectid; | |
5d4f98a2 | 547 | key.offset = 0; |
962a298f | 548 | key.type = BTRFS_ROOT_ITEM_KEY; |
f46b5a66 CH |
549 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
550 | &root_item); | |
551 | if (ret) | |
552 | goto fail; | |
553 | ||
76dda93c YZ |
554 | key.offset = (u64)-1; |
555 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa | 556 | if (IS_ERR(new_root)) { |
79787eaa | 557 | ret = PTR_ERR(new_root); |
6d13f549 | 558 | btrfs_abort_transaction(trans, root, ret); |
79787eaa JM |
559 | goto fail; |
560 | } | |
76dda93c YZ |
561 | |
562 | btrfs_record_root_in_trans(trans, new_root); | |
563 | ||
63541927 | 564 | ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid); |
ce598979 MF |
565 | if (ret) { |
566 | /* We potentially lose an unused inode item here */ | |
79787eaa | 567 | btrfs_abort_transaction(trans, root, ret); |
ce598979 MF |
568 | goto fail; |
569 | } | |
570 | ||
f32e48e9 CR |
571 | mutex_lock(&new_root->objectid_mutex); |
572 | new_root->highest_objectid = new_dirid; | |
573 | mutex_unlock(&new_root->objectid_mutex); | |
574 | ||
f46b5a66 CH |
575 | /* |
576 | * insert the directory item | |
577 | */ | |
3de4586c | 578 | ret = btrfs_set_inode_index(dir, &index); |
79787eaa JM |
579 | if (ret) { |
580 | btrfs_abort_transaction(trans, root, ret); | |
581 | goto fail; | |
582 | } | |
3de4586c CM |
583 | |
584 | ret = btrfs_insert_dir_item(trans, root, | |
16cdcec7 | 585 | name, namelen, dir, &key, |
3de4586c | 586 | BTRFS_FT_DIR, index); |
79787eaa JM |
587 | if (ret) { |
588 | btrfs_abort_transaction(trans, root, ret); | |
f46b5a66 | 589 | goto fail; |
79787eaa | 590 | } |
0660b5af | 591 | |
52c26179 YZ |
592 | btrfs_i_size_write(dir, dir->i_size + namelen * 2); |
593 | ret = btrfs_update_inode(trans, root, dir); | |
594 | BUG_ON(ret); | |
595 | ||
0660b5af | 596 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4df27c4d | 597 | objectid, root->root_key.objectid, |
33345d01 | 598 | btrfs_ino(dir), index, name, namelen); |
76dda93c | 599 | BUG_ON(ret); |
f46b5a66 | 600 | |
dd5f9615 SB |
601 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, |
602 | root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
603 | objectid); | |
604 | if (ret) | |
605 | btrfs_abort_transaction(trans, root, ret); | |
606 | ||
f46b5a66 | 607 | fail: |
d5c12070 MX |
608 | trans->block_rsv = NULL; |
609 | trans->bytes_reserved = 0; | |
de6e8200 LB |
610 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); |
611 | ||
72fd032e SW |
612 | if (async_transid) { |
613 | *async_transid = trans->transid; | |
614 | err = btrfs_commit_transaction_async(trans, root, 1); | |
00d71c9c MX |
615 | if (err) |
616 | err = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
617 | } else { |
618 | err = btrfs_commit_transaction(trans, root); | |
619 | } | |
f46b5a66 CH |
620 | if (err && !ret) |
621 | ret = err; | |
1a65e24b | 622 | |
5662344b TI |
623 | if (!ret) { |
624 | inode = btrfs_lookup_dentry(dir, dentry); | |
de6e8200 LB |
625 | if (IS_ERR(inode)) |
626 | return PTR_ERR(inode); | |
5662344b TI |
627 | d_instantiate(dentry, inode); |
628 | } | |
f46b5a66 CH |
629 | return ret; |
630 | } | |
631 | ||
9ea24bbe | 632 | static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root) |
8257b2dc MX |
633 | { |
634 | s64 writers; | |
635 | DEFINE_WAIT(wait); | |
636 | ||
637 | do { | |
638 | prepare_to_wait(&root->subv_writers->wait, &wait, | |
639 | TASK_UNINTERRUPTIBLE); | |
640 | ||
641 | writers = percpu_counter_sum(&root->subv_writers->counter); | |
642 | if (writers) | |
643 | schedule(); | |
644 | ||
645 | finish_wait(&root->subv_writers->wait, &wait); | |
646 | } while (writers); | |
647 | } | |
648 | ||
e9662f70 MX |
649 | static int create_snapshot(struct btrfs_root *root, struct inode *dir, |
650 | struct dentry *dentry, char *name, int namelen, | |
651 | u64 *async_transid, bool readonly, | |
652 | struct btrfs_qgroup_inherit *inherit) | |
f46b5a66 | 653 | { |
2e4bfab9 | 654 | struct inode *inode; |
f46b5a66 CH |
655 | struct btrfs_pending_snapshot *pending_snapshot; |
656 | struct btrfs_trans_handle *trans; | |
2e4bfab9 | 657 | int ret; |
f46b5a66 | 658 | |
27cdeb70 | 659 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
f46b5a66 CH |
660 | return -EINVAL; |
661 | ||
a1ee7362 DS |
662 | pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); |
663 | if (!pending_snapshot) | |
664 | return -ENOMEM; | |
665 | ||
b0c0ea63 DS |
666 | pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item), |
667 | GFP_NOFS); | |
8546b570 DS |
668 | pending_snapshot->path = btrfs_alloc_path(); |
669 | if (!pending_snapshot->root_item || !pending_snapshot->path) { | |
b0c0ea63 DS |
670 | ret = -ENOMEM; |
671 | goto free_pending; | |
672 | } | |
673 | ||
8257b2dc | 674 | atomic_inc(&root->will_be_snapshoted); |
4e857c58 | 675 | smp_mb__after_atomic(); |
9ea24bbe | 676 | btrfs_wait_for_no_snapshoting_writes(root); |
8257b2dc | 677 | |
6a03843d MX |
678 | ret = btrfs_start_delalloc_inodes(root, 0); |
679 | if (ret) | |
a1ee7362 | 680 | goto dec_and_free; |
6a03843d | 681 | |
b0244199 | 682 | btrfs_wait_ordered_extents(root, -1); |
6a03843d | 683 | |
66d8f3dd MX |
684 | btrfs_init_block_rsv(&pending_snapshot->block_rsv, |
685 | BTRFS_BLOCK_RSV_TEMP); | |
d5c12070 MX |
686 | /* |
687 | * 1 - parent dir inode | |
688 | * 2 - dir entries | |
689 | * 1 - root item | |
690 | * 2 - root ref/backref | |
691 | * 1 - root of snapshot | |
dd5f9615 | 692 | * 1 - UUID item |
d5c12070 MX |
693 | */ |
694 | ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root, | |
dd5f9615 | 695 | &pending_snapshot->block_rsv, 8, |
ee3441b4 JM |
696 | &pending_snapshot->qgroup_reserved, |
697 | false); | |
d5c12070 | 698 | if (ret) |
a1ee7362 | 699 | goto dec_and_free; |
d5c12070 | 700 | |
3de4586c | 701 | pending_snapshot->dentry = dentry; |
f46b5a66 | 702 | pending_snapshot->root = root; |
b83cc969 | 703 | pending_snapshot->readonly = readonly; |
e9662f70 | 704 | pending_snapshot->dir = dir; |
8696c533 | 705 | pending_snapshot->inherit = inherit; |
a22285a6 | 706 | |
d5c12070 | 707 | trans = btrfs_start_transaction(root, 0); |
a22285a6 YZ |
708 | if (IS_ERR(trans)) { |
709 | ret = PTR_ERR(trans); | |
710 | goto fail; | |
711 | } | |
712 | ||
8351583e | 713 | spin_lock(&root->fs_info->trans_lock); |
f46b5a66 CH |
714 | list_add(&pending_snapshot->list, |
715 | &trans->transaction->pending_snapshots); | |
8351583e | 716 | spin_unlock(&root->fs_info->trans_lock); |
72fd032e SW |
717 | if (async_transid) { |
718 | *async_transid = trans->transid; | |
719 | ret = btrfs_commit_transaction_async(trans, | |
720 | root->fs_info->extent_root, 1); | |
00d71c9c MX |
721 | if (ret) |
722 | ret = btrfs_commit_transaction(trans, root); | |
72fd032e SW |
723 | } else { |
724 | ret = btrfs_commit_transaction(trans, | |
725 | root->fs_info->extent_root); | |
726 | } | |
aec8030a | 727 | if (ret) |
c37b2b62 | 728 | goto fail; |
a22285a6 YZ |
729 | |
730 | ret = pending_snapshot->error; | |
731 | if (ret) | |
732 | goto fail; | |
733 | ||
d3797308 CM |
734 | ret = btrfs_orphan_cleanup(pending_snapshot->snap); |
735 | if (ret) | |
736 | goto fail; | |
737 | ||
2b0143b5 | 738 | inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry); |
2e4bfab9 YZ |
739 | if (IS_ERR(inode)) { |
740 | ret = PTR_ERR(inode); | |
741 | goto fail; | |
742 | } | |
5662344b | 743 | |
2e4bfab9 YZ |
744 | d_instantiate(dentry, inode); |
745 | ret = 0; | |
746 | fail: | |
d5c12070 MX |
747 | btrfs_subvolume_release_metadata(BTRFS_I(dir)->root, |
748 | &pending_snapshot->block_rsv, | |
749 | pending_snapshot->qgroup_reserved); | |
a1ee7362 | 750 | dec_and_free: |
9ea24bbe FM |
751 | if (atomic_dec_and_test(&root->will_be_snapshoted)) |
752 | wake_up_atomic_t(&root->will_be_snapshoted); | |
b0c0ea63 DS |
753 | free_pending: |
754 | kfree(pending_snapshot->root_item); | |
8546b570 | 755 | btrfs_free_path(pending_snapshot->path); |
a1ee7362 DS |
756 | kfree(pending_snapshot); |
757 | ||
f46b5a66 CH |
758 | return ret; |
759 | } | |
760 | ||
4260f7c7 SW |
761 | /* copy of may_delete in fs/namei.c() |
762 | * Check whether we can remove a link victim from directory dir, check | |
763 | * whether the type of victim is right. | |
764 | * 1. We can't do it if dir is read-only (done in permission()) | |
765 | * 2. We should have write and exec permissions on dir | |
766 | * 3. We can't remove anything from append-only dir | |
767 | * 4. We can't do anything with immutable dir (done in permission()) | |
768 | * 5. If the sticky bit on dir is set we should either | |
769 | * a. be owner of dir, or | |
770 | * b. be owner of victim, or | |
771 | * c. have CAP_FOWNER capability | |
772 | * 6. If the victim is append-only or immutable we can't do antyhing with | |
773 | * links pointing to it. | |
774 | * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. | |
775 | * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. | |
776 | * 9. We can't remove a root or mountpoint. | |
777 | * 10. We don't allow removal of NFS sillyrenamed files; it's handled by | |
778 | * nfs_async_unlink(). | |
779 | */ | |
780 | ||
67871254 | 781 | static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir) |
4260f7c7 SW |
782 | { |
783 | int error; | |
784 | ||
2b0143b5 | 785 | if (d_really_is_negative(victim)) |
4260f7c7 SW |
786 | return -ENOENT; |
787 | ||
2b0143b5 | 788 | BUG_ON(d_inode(victim->d_parent) != dir); |
4fa6b5ec | 789 | audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE); |
4260f7c7 SW |
790 | |
791 | error = inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
792 | if (error) | |
793 | return error; | |
794 | if (IS_APPEND(dir)) | |
795 | return -EPERM; | |
2b0143b5 DH |
796 | if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) || |
797 | IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim))) | |
4260f7c7 SW |
798 | return -EPERM; |
799 | if (isdir) { | |
e36cb0b8 | 800 | if (!d_is_dir(victim)) |
4260f7c7 SW |
801 | return -ENOTDIR; |
802 | if (IS_ROOT(victim)) | |
803 | return -EBUSY; | |
e36cb0b8 | 804 | } else if (d_is_dir(victim)) |
4260f7c7 SW |
805 | return -EISDIR; |
806 | if (IS_DEADDIR(dir)) | |
807 | return -ENOENT; | |
808 | if (victim->d_flags & DCACHE_NFSFS_RENAMED) | |
809 | return -EBUSY; | |
810 | return 0; | |
811 | } | |
812 | ||
cb8e7090 CH |
813 | /* copy of may_create in fs/namei.c() */ |
814 | static inline int btrfs_may_create(struct inode *dir, struct dentry *child) | |
815 | { | |
2b0143b5 | 816 | if (d_really_is_positive(child)) |
cb8e7090 CH |
817 | return -EEXIST; |
818 | if (IS_DEADDIR(dir)) | |
819 | return -ENOENT; | |
820 | return inode_permission(dir, MAY_WRITE | MAY_EXEC); | |
821 | } | |
822 | ||
823 | /* | |
824 | * Create a new subvolume below @parent. This is largely modeled after | |
825 | * sys_mkdirat and vfs_mkdir, but we only do a single component lookup | |
826 | * inside this filesystem so it's quite a bit simpler. | |
827 | */ | |
76dda93c YZ |
828 | static noinline int btrfs_mksubvol(struct path *parent, |
829 | char *name, int namelen, | |
72fd032e | 830 | struct btrfs_root *snap_src, |
6f72c7e2 | 831 | u64 *async_transid, bool readonly, |
8696c533 | 832 | struct btrfs_qgroup_inherit *inherit) |
cb8e7090 | 833 | { |
2b0143b5 | 834 | struct inode *dir = d_inode(parent->dentry); |
cb8e7090 CH |
835 | struct dentry *dentry; |
836 | int error; | |
837 | ||
5c50c9b8 DS |
838 | error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
839 | if (error == -EINTR) | |
840 | return error; | |
cb8e7090 CH |
841 | |
842 | dentry = lookup_one_len(name, parent->dentry, namelen); | |
843 | error = PTR_ERR(dentry); | |
844 | if (IS_ERR(dentry)) | |
845 | goto out_unlock; | |
846 | ||
76dda93c | 847 | error = btrfs_may_create(dir, dentry); |
cb8e7090 | 848 | if (error) |
a874a63e | 849 | goto out_dput; |
cb8e7090 | 850 | |
9c52057c CM |
851 | /* |
852 | * even if this name doesn't exist, we may get hash collisions. | |
853 | * check for them now when we can safely fail | |
854 | */ | |
855 | error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, | |
856 | dir->i_ino, name, | |
857 | namelen); | |
858 | if (error) | |
859 | goto out_dput; | |
860 | ||
76dda93c YZ |
861 | down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); |
862 | ||
863 | if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) | |
864 | goto out_up_read; | |
865 | ||
3de4586c | 866 | if (snap_src) { |
e9662f70 | 867 | error = create_snapshot(snap_src, dir, dentry, name, namelen, |
6f72c7e2 | 868 | async_transid, readonly, inherit); |
3de4586c | 869 | } else { |
d5c12070 MX |
870 | error = create_subvol(dir, dentry, name, namelen, |
871 | async_transid, inherit); | |
3de4586c | 872 | } |
76dda93c YZ |
873 | if (!error) |
874 | fsnotify_mkdir(dir, dentry); | |
875 | out_up_read: | |
876 | up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); | |
cb8e7090 CH |
877 | out_dput: |
878 | dput(dentry); | |
879 | out_unlock: | |
5955102c | 880 | inode_unlock(dir); |
cb8e7090 CH |
881 | return error; |
882 | } | |
883 | ||
4cb5300b CM |
884 | /* |
885 | * When we're defragging a range, we don't want to kick it off again | |
886 | * if it is really just waiting for delalloc to send it down. | |
887 | * If we find a nice big extent or delalloc range for the bytes in the | |
888 | * file you want to defrag, we return 0 to let you know to skip this | |
889 | * part of the file | |
890 | */ | |
aab110ab | 891 | static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh) |
4cb5300b CM |
892 | { |
893 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
894 | struct extent_map *em = NULL; | |
895 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
896 | u64 end; | |
897 | ||
898 | read_lock(&em_tree->lock); | |
899 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); | |
900 | read_unlock(&em_tree->lock); | |
901 | ||
902 | if (em) { | |
903 | end = extent_map_end(em); | |
904 | free_extent_map(em); | |
905 | if (end - offset > thresh) | |
906 | return 0; | |
907 | } | |
908 | /* if we already have a nice delalloc here, just stop */ | |
909 | thresh /= 2; | |
910 | end = count_range_bits(io_tree, &offset, offset + thresh, | |
911 | thresh, EXTENT_DELALLOC, 1); | |
912 | if (end >= thresh) | |
913 | return 0; | |
914 | return 1; | |
915 | } | |
916 | ||
917 | /* | |
918 | * helper function to walk through a file and find extents | |
919 | * newer than a specific transid, and smaller than thresh. | |
920 | * | |
921 | * This is used by the defragging code to find new and small | |
922 | * extents | |
923 | */ | |
924 | static int find_new_extents(struct btrfs_root *root, | |
925 | struct inode *inode, u64 newer_than, | |
aab110ab | 926 | u64 *off, u32 thresh) |
4cb5300b CM |
927 | { |
928 | struct btrfs_path *path; | |
929 | struct btrfs_key min_key; | |
4cb5300b CM |
930 | struct extent_buffer *leaf; |
931 | struct btrfs_file_extent_item *extent; | |
932 | int type; | |
933 | int ret; | |
a4689d2b | 934 | u64 ino = btrfs_ino(inode); |
4cb5300b CM |
935 | |
936 | path = btrfs_alloc_path(); | |
937 | if (!path) | |
938 | return -ENOMEM; | |
939 | ||
a4689d2b | 940 | min_key.objectid = ino; |
4cb5300b CM |
941 | min_key.type = BTRFS_EXTENT_DATA_KEY; |
942 | min_key.offset = *off; | |
943 | ||
67871254 | 944 | while (1) { |
6174d3cb | 945 | ret = btrfs_search_forward(root, &min_key, path, newer_than); |
4cb5300b CM |
946 | if (ret != 0) |
947 | goto none; | |
f094c9bd | 948 | process_slot: |
a4689d2b | 949 | if (min_key.objectid != ino) |
4cb5300b CM |
950 | goto none; |
951 | if (min_key.type != BTRFS_EXTENT_DATA_KEY) | |
952 | goto none; | |
953 | ||
954 | leaf = path->nodes[0]; | |
955 | extent = btrfs_item_ptr(leaf, path->slots[0], | |
956 | struct btrfs_file_extent_item); | |
957 | ||
958 | type = btrfs_file_extent_type(leaf, extent); | |
959 | if (type == BTRFS_FILE_EXTENT_REG && | |
960 | btrfs_file_extent_num_bytes(leaf, extent) < thresh && | |
961 | check_defrag_in_cache(inode, min_key.offset, thresh)) { | |
962 | *off = min_key.offset; | |
963 | btrfs_free_path(path); | |
964 | return 0; | |
965 | } | |
966 | ||
f094c9bd FM |
967 | path->slots[0]++; |
968 | if (path->slots[0] < btrfs_header_nritems(leaf)) { | |
969 | btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]); | |
970 | goto process_slot; | |
971 | } | |
972 | ||
4cb5300b CM |
973 | if (min_key.offset == (u64)-1) |
974 | goto none; | |
975 | ||
976 | min_key.offset++; | |
977 | btrfs_release_path(path); | |
978 | } | |
979 | none: | |
980 | btrfs_free_path(path); | |
981 | return -ENOENT; | |
982 | } | |
983 | ||
6c282eb4 | 984 | static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start) |
17ce6ef8 LB |
985 | { |
986 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
6c282eb4 LZ |
987 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
988 | struct extent_map *em; | |
989 | u64 len = PAGE_CACHE_SIZE; | |
17ce6ef8 | 990 | |
6c282eb4 LZ |
991 | /* |
992 | * hopefully we have this extent in the tree already, try without | |
993 | * the full extent lock | |
994 | */ | |
17ce6ef8 | 995 | read_lock(&em_tree->lock); |
6c282eb4 | 996 | em = lookup_extent_mapping(em_tree, start, len); |
17ce6ef8 LB |
997 | read_unlock(&em_tree->lock); |
998 | ||
6c282eb4 | 999 | if (!em) { |
308d9800 FM |
1000 | struct extent_state *cached = NULL; |
1001 | u64 end = start + len - 1; | |
1002 | ||
6c282eb4 | 1003 | /* get the big lock and read metadata off disk */ |
ff13db41 | 1004 | lock_extent_bits(io_tree, start, end, &cached); |
6c282eb4 | 1005 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
308d9800 | 1006 | unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS); |
6c282eb4 LZ |
1007 | |
1008 | if (IS_ERR(em)) | |
1009 | return NULL; | |
1010 | } | |
1011 | ||
1012 | return em; | |
1013 | } | |
17ce6ef8 | 1014 | |
6c282eb4 LZ |
1015 | static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em) |
1016 | { | |
1017 | struct extent_map *next; | |
1018 | bool ret = true; | |
1019 | ||
1020 | /* this is the last extent */ | |
1021 | if (em->start + em->len >= i_size_read(inode)) | |
1022 | return false; | |
1023 | ||
1024 | next = defrag_lookup_extent(inode, em->start + em->len); | |
e9512d72 CM |
1025 | if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE) |
1026 | ret = false; | |
1027 | else if ((em->block_start + em->block_len == next->block_start) && | |
ee22184b | 1028 | (em->block_len > SZ_128K && next->block_len > SZ_128K)) |
6c282eb4 LZ |
1029 | ret = false; |
1030 | ||
1031 | free_extent_map(next); | |
17ce6ef8 LB |
1032 | return ret; |
1033 | } | |
1034 | ||
aab110ab | 1035 | static int should_defrag_range(struct inode *inode, u64 start, u32 thresh, |
a43a2111 AM |
1036 | u64 *last_len, u64 *skip, u64 *defrag_end, |
1037 | int compress) | |
940100a4 | 1038 | { |
6c282eb4 | 1039 | struct extent_map *em; |
940100a4 | 1040 | int ret = 1; |
6c282eb4 | 1041 | bool next_mergeable = true; |
4a3560c4 | 1042 | bool prev_mergeable = true; |
940100a4 CM |
1043 | |
1044 | /* | |
008873ea | 1045 | * make sure that once we start defragging an extent, we keep on |
940100a4 CM |
1046 | * defragging it |
1047 | */ | |
1048 | if (start < *defrag_end) | |
1049 | return 1; | |
1050 | ||
1051 | *skip = 0; | |
1052 | ||
6c282eb4 LZ |
1053 | em = defrag_lookup_extent(inode, start); |
1054 | if (!em) | |
1055 | return 0; | |
940100a4 CM |
1056 | |
1057 | /* this will cover holes, and inline extents */ | |
17ce6ef8 | 1058 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
940100a4 | 1059 | ret = 0; |
17ce6ef8 LB |
1060 | goto out; |
1061 | } | |
1062 | ||
4a3560c4 LB |
1063 | if (!*defrag_end) |
1064 | prev_mergeable = false; | |
1065 | ||
6c282eb4 | 1066 | next_mergeable = defrag_check_next_extent(inode, em); |
940100a4 | 1067 | /* |
6c282eb4 LZ |
1068 | * we hit a real extent, if it is big or the next extent is not a |
1069 | * real extent, don't bother defragging it | |
940100a4 | 1070 | */ |
a43a2111 | 1071 | if (!compress && (*last_len == 0 || *last_len >= thresh) && |
4a3560c4 | 1072 | (em->len >= thresh || (!next_mergeable && !prev_mergeable))) |
940100a4 | 1073 | ret = 0; |
17ce6ef8 | 1074 | out: |
940100a4 CM |
1075 | /* |
1076 | * last_len ends up being a counter of how many bytes we've defragged. | |
1077 | * every time we choose not to defrag an extent, we reset *last_len | |
1078 | * so that the next tiny extent will force a defrag. | |
1079 | * | |
1080 | * The end result of this is that tiny extents before a single big | |
1081 | * extent will force at least part of that big extent to be defragged. | |
1082 | */ | |
1083 | if (ret) { | |
940100a4 CM |
1084 | *defrag_end = extent_map_end(em); |
1085 | } else { | |
1086 | *last_len = 0; | |
1087 | *skip = extent_map_end(em); | |
1088 | *defrag_end = 0; | |
1089 | } | |
1090 | ||
1091 | free_extent_map(em); | |
1092 | return ret; | |
1093 | } | |
1094 | ||
4cb5300b CM |
1095 | /* |
1096 | * it doesn't do much good to defrag one or two pages | |
1097 | * at a time. This pulls in a nice chunk of pages | |
1098 | * to COW and defrag. | |
1099 | * | |
1100 | * It also makes sure the delalloc code has enough | |
1101 | * dirty data to avoid making new small extents as part | |
1102 | * of the defrag | |
1103 | * | |
1104 | * It's a good idea to start RA on this range | |
1105 | * before calling this. | |
1106 | */ | |
1107 | static int cluster_pages_for_defrag(struct inode *inode, | |
1108 | struct page **pages, | |
1109 | unsigned long start_index, | |
c41570c9 | 1110 | unsigned long num_pages) |
f46b5a66 | 1111 | { |
4cb5300b CM |
1112 | unsigned long file_end; |
1113 | u64 isize = i_size_read(inode); | |
1114 | u64 page_start; | |
1115 | u64 page_end; | |
1f12bd06 | 1116 | u64 page_cnt; |
4cb5300b CM |
1117 | int ret; |
1118 | int i; | |
1119 | int i_done; | |
3eaa2885 | 1120 | struct btrfs_ordered_extent *ordered; |
4cb5300b | 1121 | struct extent_state *cached_state = NULL; |
600a45e1 | 1122 | struct extent_io_tree *tree; |
3b16a4e3 | 1123 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
4cb5300b | 1124 | |
4cb5300b | 1125 | file_end = (isize - 1) >> PAGE_CACHE_SHIFT; |
1f12bd06 LB |
1126 | if (!isize || start_index > file_end) |
1127 | return 0; | |
1128 | ||
1129 | page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1); | |
4cb5300b CM |
1130 | |
1131 | ret = btrfs_delalloc_reserve_space(inode, | |
df480633 QW |
1132 | start_index << PAGE_CACHE_SHIFT, |
1133 | page_cnt << PAGE_CACHE_SHIFT); | |
4cb5300b CM |
1134 | if (ret) |
1135 | return ret; | |
4cb5300b | 1136 | i_done = 0; |
600a45e1 | 1137 | tree = &BTRFS_I(inode)->io_tree; |
4cb5300b CM |
1138 | |
1139 | /* step one, lock all the pages */ | |
1f12bd06 | 1140 | for (i = 0; i < page_cnt; i++) { |
4cb5300b | 1141 | struct page *page; |
600a45e1 | 1142 | again: |
a94733d0 | 1143 | page = find_or_create_page(inode->i_mapping, |
600a45e1 | 1144 | start_index + i, mask); |
4cb5300b CM |
1145 | if (!page) |
1146 | break; | |
1147 | ||
600a45e1 MX |
1148 | page_start = page_offset(page); |
1149 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1150 | while (1) { | |
308d9800 | 1151 | lock_extent_bits(tree, page_start, page_end, |
ff13db41 | 1152 | &cached_state); |
600a45e1 MX |
1153 | ordered = btrfs_lookup_ordered_extent(inode, |
1154 | page_start); | |
308d9800 FM |
1155 | unlock_extent_cached(tree, page_start, page_end, |
1156 | &cached_state, GFP_NOFS); | |
600a45e1 MX |
1157 | if (!ordered) |
1158 | break; | |
1159 | ||
1160 | unlock_page(page); | |
1161 | btrfs_start_ordered_extent(inode, ordered, 1); | |
1162 | btrfs_put_ordered_extent(ordered); | |
1163 | lock_page(page); | |
1f12bd06 LB |
1164 | /* |
1165 | * we unlocked the page above, so we need check if | |
1166 | * it was released or not. | |
1167 | */ | |
1168 | if (page->mapping != inode->i_mapping) { | |
1169 | unlock_page(page); | |
1170 | page_cache_release(page); | |
1171 | goto again; | |
1172 | } | |
600a45e1 MX |
1173 | } |
1174 | ||
4cb5300b CM |
1175 | if (!PageUptodate(page)) { |
1176 | btrfs_readpage(NULL, page); | |
1177 | lock_page(page); | |
1178 | if (!PageUptodate(page)) { | |
1179 | unlock_page(page); | |
1180 | page_cache_release(page); | |
1181 | ret = -EIO; | |
1182 | break; | |
1183 | } | |
1184 | } | |
600a45e1 | 1185 | |
600a45e1 MX |
1186 | if (page->mapping != inode->i_mapping) { |
1187 | unlock_page(page); | |
1188 | page_cache_release(page); | |
1189 | goto again; | |
1190 | } | |
1191 | ||
4cb5300b CM |
1192 | pages[i] = page; |
1193 | i_done++; | |
1194 | } | |
1195 | if (!i_done || ret) | |
1196 | goto out; | |
1197 | ||
1198 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1199 | goto out; | |
1200 | ||
1201 | /* | |
1202 | * so now we have a nice long stream of locked | |
1203 | * and up to date pages, lets wait on them | |
1204 | */ | |
1205 | for (i = 0; i < i_done; i++) | |
1206 | wait_on_page_writeback(pages[i]); | |
1207 | ||
1208 | page_start = page_offset(pages[0]); | |
1209 | page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE; | |
1210 | ||
1211 | lock_extent_bits(&BTRFS_I(inode)->io_tree, | |
ff13db41 | 1212 | page_start, page_end - 1, &cached_state); |
4cb5300b CM |
1213 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, |
1214 | page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
1215 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0, |
1216 | &cached_state, GFP_NOFS); | |
4cb5300b | 1217 | |
1f12bd06 | 1218 | if (i_done != page_cnt) { |
9e0baf60 JB |
1219 | spin_lock(&BTRFS_I(inode)->lock); |
1220 | BTRFS_I(inode)->outstanding_extents++; | |
1221 | spin_unlock(&BTRFS_I(inode)->lock); | |
4cb5300b | 1222 | btrfs_delalloc_release_space(inode, |
df480633 QW |
1223 | start_index << PAGE_CACHE_SHIFT, |
1224 | (page_cnt - i_done) << PAGE_CACHE_SHIFT); | |
4cb5300b CM |
1225 | } |
1226 | ||
1227 | ||
9e8a4a8b LB |
1228 | set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1, |
1229 | &cached_state, GFP_NOFS); | |
4cb5300b CM |
1230 | |
1231 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, | |
1232 | page_start, page_end - 1, &cached_state, | |
1233 | GFP_NOFS); | |
1234 | ||
1235 | for (i = 0; i < i_done; i++) { | |
1236 | clear_page_dirty_for_io(pages[i]); | |
1237 | ClearPageChecked(pages[i]); | |
1238 | set_page_extent_mapped(pages[i]); | |
1239 | set_page_dirty(pages[i]); | |
1240 | unlock_page(pages[i]); | |
1241 | page_cache_release(pages[i]); | |
1242 | } | |
1243 | return i_done; | |
1244 | out: | |
1245 | for (i = 0; i < i_done; i++) { | |
1246 | unlock_page(pages[i]); | |
1247 | page_cache_release(pages[i]); | |
1248 | } | |
7cf5b976 | 1249 | btrfs_delalloc_release_space(inode, |
df480633 QW |
1250 | start_index << PAGE_CACHE_SHIFT, |
1251 | page_cnt << PAGE_CACHE_SHIFT); | |
4cb5300b CM |
1252 | return ret; |
1253 | ||
1254 | } | |
1255 | ||
1256 | int btrfs_defrag_file(struct inode *inode, struct file *file, | |
1257 | struct btrfs_ioctl_defrag_range_args *range, | |
1258 | u64 newer_than, unsigned long max_to_defrag) | |
1259 | { | |
1260 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4cb5300b | 1261 | struct file_ra_state *ra = NULL; |
f46b5a66 | 1262 | unsigned long last_index; |
151a31b2 | 1263 | u64 isize = i_size_read(inode); |
940100a4 CM |
1264 | u64 last_len = 0; |
1265 | u64 skip = 0; | |
1266 | u64 defrag_end = 0; | |
4cb5300b | 1267 | u64 newer_off = range->start; |
f46b5a66 | 1268 | unsigned long i; |
008873ea | 1269 | unsigned long ra_index = 0; |
f46b5a66 | 1270 | int ret; |
4cb5300b | 1271 | int defrag_count = 0; |
1a419d85 | 1272 | int compress_type = BTRFS_COMPRESS_ZLIB; |
aab110ab | 1273 | u32 extent_thresh = range->extent_thresh; |
ee22184b | 1274 | unsigned long max_cluster = SZ_256K >> PAGE_CACHE_SHIFT; |
c41570c9 | 1275 | unsigned long cluster = max_cluster; |
ee22184b | 1276 | u64 new_align = ~((u64)SZ_128K - 1); |
4cb5300b CM |
1277 | struct page **pages = NULL; |
1278 | ||
0abd5b17 LB |
1279 | if (isize == 0) |
1280 | return 0; | |
1281 | ||
1282 | if (range->start >= isize) | |
1283 | return -EINVAL; | |
1a419d85 LZ |
1284 | |
1285 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { | |
1286 | if (range->compress_type > BTRFS_COMPRESS_TYPES) | |
1287 | return -EINVAL; | |
1288 | if (range->compress_type) | |
1289 | compress_type = range->compress_type; | |
1290 | } | |
f46b5a66 | 1291 | |
0abd5b17 | 1292 | if (extent_thresh == 0) |
ee22184b | 1293 | extent_thresh = SZ_256K; |
940100a4 | 1294 | |
4cb5300b CM |
1295 | /* |
1296 | * if we were not given a file, allocate a readahead | |
1297 | * context | |
1298 | */ | |
1299 | if (!file) { | |
1300 | ra = kzalloc(sizeof(*ra), GFP_NOFS); | |
1301 | if (!ra) | |
1302 | return -ENOMEM; | |
1303 | file_ra_state_init(ra, inode->i_mapping); | |
1304 | } else { | |
1305 | ra = &file->f_ra; | |
1306 | } | |
1307 | ||
d9b0d9ba | 1308 | pages = kmalloc_array(max_cluster, sizeof(struct page *), |
4cb5300b CM |
1309 | GFP_NOFS); |
1310 | if (!pages) { | |
1311 | ret = -ENOMEM; | |
1312 | goto out_ra; | |
1313 | } | |
1314 | ||
1315 | /* find the last page to defrag */ | |
1e701a32 | 1316 | if (range->start + range->len > range->start) { |
151a31b2 | 1317 | last_index = min_t(u64, isize - 1, |
1e701a32 CM |
1318 | range->start + range->len - 1) >> PAGE_CACHE_SHIFT; |
1319 | } else { | |
151a31b2 | 1320 | last_index = (isize - 1) >> PAGE_CACHE_SHIFT; |
1e701a32 CM |
1321 | } |
1322 | ||
4cb5300b CM |
1323 | if (newer_than) { |
1324 | ret = find_new_extents(root, inode, newer_than, | |
ee22184b | 1325 | &newer_off, SZ_64K); |
4cb5300b CM |
1326 | if (!ret) { |
1327 | range->start = newer_off; | |
1328 | /* | |
1329 | * we always align our defrag to help keep | |
1330 | * the extents in the file evenly spaced | |
1331 | */ | |
1332 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1333 | } else |
1334 | goto out_ra; | |
1335 | } else { | |
1336 | i = range->start >> PAGE_CACHE_SHIFT; | |
1337 | } | |
1338 | if (!max_to_defrag) | |
070034bd | 1339 | max_to_defrag = last_index - i + 1; |
4cb5300b | 1340 | |
2a0f7f57 LZ |
1341 | /* |
1342 | * make writeback starts from i, so the defrag range can be | |
1343 | * written sequentially. | |
1344 | */ | |
1345 | if (i < inode->i_mapping->writeback_index) | |
1346 | inode->i_mapping->writeback_index = i; | |
1347 | ||
f7f43cc8 | 1348 | while (i <= last_index && defrag_count < max_to_defrag && |
ed6078f7 | 1349 | (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) { |
4cb5300b CM |
1350 | /* |
1351 | * make sure we stop running if someone unmounts | |
1352 | * the FS | |
1353 | */ | |
1354 | if (!(inode->i_sb->s_flags & MS_ACTIVE)) | |
1355 | break; | |
1356 | ||
210549eb | 1357 | if (btrfs_defrag_cancelled(root->fs_info)) { |
f14d104d | 1358 | btrfs_debug(root->fs_info, "defrag_file cancelled"); |
210549eb DS |
1359 | ret = -EAGAIN; |
1360 | break; | |
1361 | } | |
1362 | ||
66c26892 | 1363 | if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, |
6c282eb4 | 1364 | extent_thresh, &last_len, &skip, |
a43a2111 AM |
1365 | &defrag_end, range->flags & |
1366 | BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
940100a4 CM |
1367 | unsigned long next; |
1368 | /* | |
1369 | * the should_defrag function tells us how much to skip | |
1370 | * bump our counter by the suggested amount | |
1371 | */ | |
ed6078f7 | 1372 | next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE); |
940100a4 CM |
1373 | i = max(i + 1, next); |
1374 | continue; | |
1375 | } | |
008873ea LZ |
1376 | |
1377 | if (!newer_than) { | |
1378 | cluster = (PAGE_CACHE_ALIGN(defrag_end) >> | |
1379 | PAGE_CACHE_SHIFT) - i; | |
1380 | cluster = min(cluster, max_cluster); | |
1381 | } else { | |
1382 | cluster = max_cluster; | |
1383 | } | |
1384 | ||
008873ea LZ |
1385 | if (i + cluster > ra_index) { |
1386 | ra_index = max(i, ra_index); | |
1387 | btrfs_force_ra(inode->i_mapping, ra, file, ra_index, | |
1388 | cluster); | |
e4826a5b | 1389 | ra_index += cluster; |
008873ea | 1390 | } |
940100a4 | 1391 | |
5955102c | 1392 | inode_lock(inode); |
633085c7 FDBM |
1393 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) |
1394 | BTRFS_I(inode)->force_compress = compress_type; | |
008873ea | 1395 | ret = cluster_pages_for_defrag(inode, pages, i, cluster); |
ecb8bea8 | 1396 | if (ret < 0) { |
5955102c | 1397 | inode_unlock(inode); |
4cb5300b | 1398 | goto out_ra; |
ecb8bea8 | 1399 | } |
4cb5300b CM |
1400 | |
1401 | defrag_count += ret; | |
d0e1d66b | 1402 | balance_dirty_pages_ratelimited(inode->i_mapping); |
5955102c | 1403 | inode_unlock(inode); |
4cb5300b CM |
1404 | |
1405 | if (newer_than) { | |
1406 | if (newer_off == (u64)-1) | |
1407 | break; | |
1408 | ||
e1f041e1 LB |
1409 | if (ret > 0) |
1410 | i += ret; | |
1411 | ||
4cb5300b CM |
1412 | newer_off = max(newer_off + 1, |
1413 | (u64)i << PAGE_CACHE_SHIFT); | |
1414 | ||
ee22184b BL |
1415 | ret = find_new_extents(root, inode, newer_than, |
1416 | &newer_off, SZ_64K); | |
4cb5300b CM |
1417 | if (!ret) { |
1418 | range->start = newer_off; | |
1419 | i = (newer_off & new_align) >> PAGE_CACHE_SHIFT; | |
4cb5300b CM |
1420 | } else { |
1421 | break; | |
f46b5a66 | 1422 | } |
4cb5300b | 1423 | } else { |
008873ea | 1424 | if (ret > 0) { |
cbcc8326 | 1425 | i += ret; |
008873ea LZ |
1426 | last_len += ret << PAGE_CACHE_SHIFT; |
1427 | } else { | |
cbcc8326 | 1428 | i++; |
008873ea LZ |
1429 | last_len = 0; |
1430 | } | |
f46b5a66 | 1431 | } |
f46b5a66 CH |
1432 | } |
1433 | ||
dec8ef90 | 1434 | if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) { |
1e701a32 | 1435 | filemap_flush(inode->i_mapping); |
dec8ef90 FM |
1436 | if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
1437 | &BTRFS_I(inode)->runtime_flags)) | |
1438 | filemap_flush(inode->i_mapping); | |
1439 | } | |
1e701a32 CM |
1440 | |
1441 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
1442 | /* the filemap_flush will queue IO into the worker threads, but | |
1443 | * we have to make sure the IO is actually started and that | |
1444 | * ordered extents get created before we return | |
1445 | */ | |
1446 | atomic_inc(&root->fs_info->async_submit_draining); | |
1447 | while (atomic_read(&root->fs_info->nr_async_submits) || | |
1448 | atomic_read(&root->fs_info->async_delalloc_pages)) { | |
1449 | wait_event(root->fs_info->async_submit_wait, | |
1450 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && | |
1451 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
1452 | } | |
1453 | atomic_dec(&root->fs_info->async_submit_draining); | |
1e701a32 CM |
1454 | } |
1455 | ||
1a419d85 | 1456 | if (range->compress_type == BTRFS_COMPRESS_LZO) { |
2b0ce2c2 | 1457 | btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO); |
1a419d85 LZ |
1458 | } |
1459 | ||
60ccf82f | 1460 | ret = defrag_count; |
940100a4 | 1461 | |
4cb5300b | 1462 | out_ra: |
633085c7 | 1463 | if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { |
5955102c | 1464 | inode_lock(inode); |
633085c7 | 1465 | BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; |
5955102c | 1466 | inode_unlock(inode); |
633085c7 | 1467 | } |
4cb5300b CM |
1468 | if (!file) |
1469 | kfree(ra); | |
1470 | kfree(pages); | |
940100a4 | 1471 | return ret; |
f46b5a66 CH |
1472 | } |
1473 | ||
198605a8 | 1474 | static noinline int btrfs_ioctl_resize(struct file *file, |
76dda93c | 1475 | void __user *arg) |
f46b5a66 CH |
1476 | { |
1477 | u64 new_size; | |
1478 | u64 old_size; | |
1479 | u64 devid = 1; | |
496ad9aa | 1480 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
1481 | struct btrfs_ioctl_vol_args *vol_args; |
1482 | struct btrfs_trans_handle *trans; | |
1483 | struct btrfs_device *device = NULL; | |
1484 | char *sizestr; | |
9a40f122 | 1485 | char *retptr; |
f46b5a66 CH |
1486 | char *devstr = NULL; |
1487 | int ret = 0; | |
f46b5a66 CH |
1488 | int mod = 0; |
1489 | ||
e441d54d CM |
1490 | if (!capable(CAP_SYS_ADMIN)) |
1491 | return -EPERM; | |
1492 | ||
198605a8 MX |
1493 | ret = mnt_want_write_file(file); |
1494 | if (ret) | |
1495 | return ret; | |
1496 | ||
5ac00add SB |
1497 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
1498 | 1)) { | |
97547676 | 1499 | mnt_drop_write_file(file); |
e57138b3 | 1500 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
1501 | } |
1502 | ||
5ac00add | 1503 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 1504 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
1505 | if (IS_ERR(vol_args)) { |
1506 | ret = PTR_ERR(vol_args); | |
1507 | goto out; | |
1508 | } | |
5516e595 MF |
1509 | |
1510 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
f46b5a66 | 1511 | |
f46b5a66 CH |
1512 | sizestr = vol_args->name; |
1513 | devstr = strchr(sizestr, ':'); | |
1514 | if (devstr) { | |
f46b5a66 CH |
1515 | sizestr = devstr + 1; |
1516 | *devstr = '\0'; | |
1517 | devstr = vol_args->name; | |
58dfae63 Z |
1518 | ret = kstrtoull(devstr, 10, &devid); |
1519 | if (ret) | |
1520 | goto out_free; | |
dfd79829 MX |
1521 | if (!devid) { |
1522 | ret = -EINVAL; | |
1523 | goto out_free; | |
1524 | } | |
efe120a0 | 1525 | btrfs_info(root->fs_info, "resizing devid %llu", devid); |
f46b5a66 | 1526 | } |
dba60f3f | 1527 | |
aa1b8cd4 | 1528 | device = btrfs_find_device(root->fs_info, devid, NULL, NULL); |
f46b5a66 | 1529 | if (!device) { |
efe120a0 | 1530 | btrfs_info(root->fs_info, "resizer unable to find device %llu", |
c1c9ff7c | 1531 | devid); |
dfd79829 | 1532 | ret = -ENODEV; |
c9e9f97b | 1533 | goto out_free; |
f46b5a66 | 1534 | } |
dba60f3f MX |
1535 | |
1536 | if (!device->writeable) { | |
efe120a0 FH |
1537 | btrfs_info(root->fs_info, |
1538 | "resizer unable to apply on readonly device %llu", | |
c1c9ff7c | 1539 | devid); |
dfd79829 | 1540 | ret = -EPERM; |
4e42ae1b LB |
1541 | goto out_free; |
1542 | } | |
1543 | ||
f46b5a66 CH |
1544 | if (!strcmp(sizestr, "max")) |
1545 | new_size = device->bdev->bd_inode->i_size; | |
1546 | else { | |
1547 | if (sizestr[0] == '-') { | |
1548 | mod = -1; | |
1549 | sizestr++; | |
1550 | } else if (sizestr[0] == '+') { | |
1551 | mod = 1; | |
1552 | sizestr++; | |
1553 | } | |
9a40f122 GH |
1554 | new_size = memparse(sizestr, &retptr); |
1555 | if (*retptr != '\0' || new_size == 0) { | |
f46b5a66 | 1556 | ret = -EINVAL; |
c9e9f97b | 1557 | goto out_free; |
f46b5a66 CH |
1558 | } |
1559 | } | |
1560 | ||
63a212ab | 1561 | if (device->is_tgtdev_for_dev_replace) { |
dfd79829 | 1562 | ret = -EPERM; |
63a212ab SB |
1563 | goto out_free; |
1564 | } | |
1565 | ||
7cc8e58d | 1566 | old_size = btrfs_device_get_total_bytes(device); |
f46b5a66 CH |
1567 | |
1568 | if (mod < 0) { | |
1569 | if (new_size > old_size) { | |
1570 | ret = -EINVAL; | |
c9e9f97b | 1571 | goto out_free; |
f46b5a66 CH |
1572 | } |
1573 | new_size = old_size - new_size; | |
1574 | } else if (mod > 0) { | |
eb8052e0 | 1575 | if (new_size > ULLONG_MAX - old_size) { |
902c68a4 | 1576 | ret = -ERANGE; |
eb8052e0 WF |
1577 | goto out_free; |
1578 | } | |
f46b5a66 CH |
1579 | new_size = old_size + new_size; |
1580 | } | |
1581 | ||
ee22184b | 1582 | if (new_size < SZ_256M) { |
f46b5a66 | 1583 | ret = -EINVAL; |
c9e9f97b | 1584 | goto out_free; |
f46b5a66 CH |
1585 | } |
1586 | if (new_size > device->bdev->bd_inode->i_size) { | |
1587 | ret = -EFBIG; | |
c9e9f97b | 1588 | goto out_free; |
f46b5a66 CH |
1589 | } |
1590 | ||
b8b93add | 1591 | new_size = div_u64(new_size, root->sectorsize); |
f46b5a66 CH |
1592 | new_size *= root->sectorsize; |
1593 | ||
ecaeb14b | 1594 | btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu", |
c1c9ff7c | 1595 | rcu_str_deref(device->name), new_size); |
f46b5a66 CH |
1596 | |
1597 | if (new_size > old_size) { | |
a22285a6 | 1598 | trans = btrfs_start_transaction(root, 0); |
98d5dc13 TI |
1599 | if (IS_ERR(trans)) { |
1600 | ret = PTR_ERR(trans); | |
c9e9f97b | 1601 | goto out_free; |
98d5dc13 | 1602 | } |
f46b5a66 CH |
1603 | ret = btrfs_grow_device(trans, device, new_size); |
1604 | btrfs_commit_transaction(trans, root); | |
ece7d20e | 1605 | } else if (new_size < old_size) { |
f46b5a66 | 1606 | ret = btrfs_shrink_device(device, new_size); |
0253f40e | 1607 | } /* equal, nothing need to do */ |
f46b5a66 | 1608 | |
c9e9f97b | 1609 | out_free: |
f46b5a66 | 1610 | kfree(vol_args); |
c9e9f97b ID |
1611 | out: |
1612 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 1613 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
18f39c41 | 1614 | mnt_drop_write_file(file); |
f46b5a66 CH |
1615 | return ret; |
1616 | } | |
1617 | ||
72fd032e | 1618 | static noinline int btrfs_ioctl_snap_create_transid(struct file *file, |
6f72c7e2 AJ |
1619 | char *name, unsigned long fd, int subvol, |
1620 | u64 *transid, bool readonly, | |
8696c533 | 1621 | struct btrfs_qgroup_inherit *inherit) |
f46b5a66 | 1622 | { |
f46b5a66 | 1623 | int namelen; |
3de4586c | 1624 | int ret = 0; |
f46b5a66 | 1625 | |
a874a63e LB |
1626 | ret = mnt_want_write_file(file); |
1627 | if (ret) | |
1628 | goto out; | |
1629 | ||
72fd032e SW |
1630 | namelen = strlen(name); |
1631 | if (strchr(name, '/')) { | |
f46b5a66 | 1632 | ret = -EINVAL; |
a874a63e | 1633 | goto out_drop_write; |
f46b5a66 CH |
1634 | } |
1635 | ||
16780cab CM |
1636 | if (name[0] == '.' && |
1637 | (namelen == 1 || (name[1] == '.' && namelen == 2))) { | |
1638 | ret = -EEXIST; | |
a874a63e | 1639 | goto out_drop_write; |
16780cab CM |
1640 | } |
1641 | ||
3de4586c | 1642 | if (subvol) { |
72fd032e | 1643 | ret = btrfs_mksubvol(&file->f_path, name, namelen, |
6f72c7e2 | 1644 | NULL, transid, readonly, inherit); |
cb8e7090 | 1645 | } else { |
2903ff01 | 1646 | struct fd src = fdget(fd); |
3de4586c | 1647 | struct inode *src_inode; |
2903ff01 | 1648 | if (!src.file) { |
3de4586c | 1649 | ret = -EINVAL; |
a874a63e | 1650 | goto out_drop_write; |
3de4586c CM |
1651 | } |
1652 | ||
496ad9aa AV |
1653 | src_inode = file_inode(src.file); |
1654 | if (src_inode->i_sb != file_inode(file)->i_sb) { | |
efe120a0 FH |
1655 | btrfs_info(BTRFS_I(src_inode)->root->fs_info, |
1656 | "Snapshot src from another FS"); | |
23ad5b17 | 1657 | ret = -EXDEV; |
d0242061 DS |
1658 | } else if (!inode_owner_or_capable(src_inode)) { |
1659 | /* | |
1660 | * Subvolume creation is not restricted, but snapshots | |
1661 | * are limited to own subvolumes only | |
1662 | */ | |
1663 | ret = -EPERM; | |
ecd18815 AV |
1664 | } else { |
1665 | ret = btrfs_mksubvol(&file->f_path, name, namelen, | |
1666 | BTRFS_I(src_inode)->root, | |
1667 | transid, readonly, inherit); | |
3de4586c | 1668 | } |
2903ff01 | 1669 | fdput(src); |
cb8e7090 | 1670 | } |
a874a63e LB |
1671 | out_drop_write: |
1672 | mnt_drop_write_file(file); | |
f46b5a66 | 1673 | out: |
72fd032e SW |
1674 | return ret; |
1675 | } | |
1676 | ||
1677 | static noinline int btrfs_ioctl_snap_create(struct file *file, | |
fa0d2b9b | 1678 | void __user *arg, int subvol) |
72fd032e | 1679 | { |
fa0d2b9b | 1680 | struct btrfs_ioctl_vol_args *vol_args; |
72fd032e SW |
1681 | int ret; |
1682 | ||
fa0d2b9b LZ |
1683 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1684 | if (IS_ERR(vol_args)) | |
1685 | return PTR_ERR(vol_args); | |
1686 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
72fd032e | 1687 | |
fa0d2b9b | 1688 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, |
b83cc969 | 1689 | vol_args->fd, subvol, |
6f72c7e2 | 1690 | NULL, false, NULL); |
fdfb1e4f | 1691 | |
fa0d2b9b LZ |
1692 | kfree(vol_args); |
1693 | return ret; | |
1694 | } | |
fdfb1e4f | 1695 | |
fa0d2b9b LZ |
1696 | static noinline int btrfs_ioctl_snap_create_v2(struct file *file, |
1697 | void __user *arg, int subvol) | |
1698 | { | |
1699 | struct btrfs_ioctl_vol_args_v2 *vol_args; | |
1700 | int ret; | |
1701 | u64 transid = 0; | |
1702 | u64 *ptr = NULL; | |
b83cc969 | 1703 | bool readonly = false; |
6f72c7e2 | 1704 | struct btrfs_qgroup_inherit *inherit = NULL; |
75eaa0e2 | 1705 | |
fa0d2b9b LZ |
1706 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
1707 | if (IS_ERR(vol_args)) | |
1708 | return PTR_ERR(vol_args); | |
1709 | vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; | |
75eaa0e2 | 1710 | |
b83cc969 | 1711 | if (vol_args->flags & |
6f72c7e2 AJ |
1712 | ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY | |
1713 | BTRFS_SUBVOL_QGROUP_INHERIT)) { | |
b83cc969 | 1714 | ret = -EOPNOTSUPP; |
c47ca32d | 1715 | goto free_args; |
72fd032e | 1716 | } |
fa0d2b9b LZ |
1717 | |
1718 | if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) | |
1719 | ptr = &transid; | |
b83cc969 LZ |
1720 | if (vol_args->flags & BTRFS_SUBVOL_RDONLY) |
1721 | readonly = true; | |
6f72c7e2 AJ |
1722 | if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) { |
1723 | if (vol_args->size > PAGE_CACHE_SIZE) { | |
1724 | ret = -EINVAL; | |
c47ca32d | 1725 | goto free_args; |
6f72c7e2 AJ |
1726 | } |
1727 | inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size); | |
1728 | if (IS_ERR(inherit)) { | |
1729 | ret = PTR_ERR(inherit); | |
c47ca32d | 1730 | goto free_args; |
6f72c7e2 AJ |
1731 | } |
1732 | } | |
fa0d2b9b LZ |
1733 | |
1734 | ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, | |
6f72c7e2 | 1735 | vol_args->fd, subvol, ptr, |
8696c533 | 1736 | readonly, inherit); |
c47ca32d DC |
1737 | if (ret) |
1738 | goto free_inherit; | |
fa0d2b9b | 1739 | |
c47ca32d DC |
1740 | if (ptr && copy_to_user(arg + |
1741 | offsetof(struct btrfs_ioctl_vol_args_v2, | |
1742 | transid), | |
1743 | ptr, sizeof(*ptr))) | |
fa0d2b9b | 1744 | ret = -EFAULT; |
c47ca32d DC |
1745 | |
1746 | free_inherit: | |
6f72c7e2 | 1747 | kfree(inherit); |
c47ca32d DC |
1748 | free_args: |
1749 | kfree(vol_args); | |
f46b5a66 CH |
1750 | return ret; |
1751 | } | |
1752 | ||
0caa102d LZ |
1753 | static noinline int btrfs_ioctl_subvol_getflags(struct file *file, |
1754 | void __user *arg) | |
1755 | { | |
496ad9aa | 1756 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1757 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1758 | int ret = 0; | |
1759 | u64 flags = 0; | |
1760 | ||
33345d01 | 1761 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) |
0caa102d LZ |
1762 | return -EINVAL; |
1763 | ||
1764 | down_read(&root->fs_info->subvol_sem); | |
1765 | if (btrfs_root_readonly(root)) | |
1766 | flags |= BTRFS_SUBVOL_RDONLY; | |
1767 | up_read(&root->fs_info->subvol_sem); | |
1768 | ||
1769 | if (copy_to_user(arg, &flags, sizeof(flags))) | |
1770 | ret = -EFAULT; | |
1771 | ||
1772 | return ret; | |
1773 | } | |
1774 | ||
1775 | static noinline int btrfs_ioctl_subvol_setflags(struct file *file, | |
1776 | void __user *arg) | |
1777 | { | |
496ad9aa | 1778 | struct inode *inode = file_inode(file); |
0caa102d LZ |
1779 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1780 | struct btrfs_trans_handle *trans; | |
1781 | u64 root_flags; | |
1782 | u64 flags; | |
1783 | int ret = 0; | |
1784 | ||
bd60ea0f DS |
1785 | if (!inode_owner_or_capable(inode)) |
1786 | return -EPERM; | |
1787 | ||
b9ca0664 LB |
1788 | ret = mnt_want_write_file(file); |
1789 | if (ret) | |
1790 | goto out; | |
0caa102d | 1791 | |
b9ca0664 LB |
1792 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
1793 | ret = -EINVAL; | |
1794 | goto out_drop_write; | |
1795 | } | |
0caa102d | 1796 | |
b9ca0664 LB |
1797 | if (copy_from_user(&flags, arg, sizeof(flags))) { |
1798 | ret = -EFAULT; | |
1799 | goto out_drop_write; | |
1800 | } | |
0caa102d | 1801 | |
b9ca0664 LB |
1802 | if (flags & BTRFS_SUBVOL_CREATE_ASYNC) { |
1803 | ret = -EINVAL; | |
1804 | goto out_drop_write; | |
1805 | } | |
0caa102d | 1806 | |
b9ca0664 LB |
1807 | if (flags & ~BTRFS_SUBVOL_RDONLY) { |
1808 | ret = -EOPNOTSUPP; | |
1809 | goto out_drop_write; | |
1810 | } | |
0caa102d LZ |
1811 | |
1812 | down_write(&root->fs_info->subvol_sem); | |
1813 | ||
1814 | /* nothing to do */ | |
1815 | if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) | |
b9ca0664 | 1816 | goto out_drop_sem; |
0caa102d LZ |
1817 | |
1818 | root_flags = btrfs_root_flags(&root->root_item); | |
2c686537 | 1819 | if (flags & BTRFS_SUBVOL_RDONLY) { |
0caa102d LZ |
1820 | btrfs_set_root_flags(&root->root_item, |
1821 | root_flags | BTRFS_ROOT_SUBVOL_RDONLY); | |
2c686537 DS |
1822 | } else { |
1823 | /* | |
1824 | * Block RO -> RW transition if this subvolume is involved in | |
1825 | * send | |
1826 | */ | |
1827 | spin_lock(&root->root_item_lock); | |
1828 | if (root->send_in_progress == 0) { | |
1829 | btrfs_set_root_flags(&root->root_item, | |
0caa102d | 1830 | root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); |
2c686537 DS |
1831 | spin_unlock(&root->root_item_lock); |
1832 | } else { | |
1833 | spin_unlock(&root->root_item_lock); | |
1834 | btrfs_warn(root->fs_info, | |
1835 | "Attempt to set subvolume %llu read-write during send", | |
1836 | root->root_key.objectid); | |
1837 | ret = -EPERM; | |
1838 | goto out_drop_sem; | |
1839 | } | |
1840 | } | |
0caa102d LZ |
1841 | |
1842 | trans = btrfs_start_transaction(root, 1); | |
1843 | if (IS_ERR(trans)) { | |
1844 | ret = PTR_ERR(trans); | |
1845 | goto out_reset; | |
1846 | } | |
1847 | ||
b4dc2b8c | 1848 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
0caa102d LZ |
1849 | &root->root_key, &root->root_item); |
1850 | ||
1851 | btrfs_commit_transaction(trans, root); | |
1852 | out_reset: | |
1853 | if (ret) | |
1854 | btrfs_set_root_flags(&root->root_item, root_flags); | |
b9ca0664 | 1855 | out_drop_sem: |
0caa102d | 1856 | up_write(&root->fs_info->subvol_sem); |
b9ca0664 LB |
1857 | out_drop_write: |
1858 | mnt_drop_write_file(file); | |
1859 | out: | |
0caa102d LZ |
1860 | return ret; |
1861 | } | |
1862 | ||
76dda93c YZ |
1863 | /* |
1864 | * helper to check if the subvolume references other subvolumes | |
1865 | */ | |
1866 | static noinline int may_destroy_subvol(struct btrfs_root *root) | |
1867 | { | |
1868 | struct btrfs_path *path; | |
175a2b87 | 1869 | struct btrfs_dir_item *di; |
76dda93c | 1870 | struct btrfs_key key; |
175a2b87 | 1871 | u64 dir_id; |
76dda93c YZ |
1872 | int ret; |
1873 | ||
1874 | path = btrfs_alloc_path(); | |
1875 | if (!path) | |
1876 | return -ENOMEM; | |
1877 | ||
175a2b87 JB |
1878 | /* Make sure this root isn't set as the default subvol */ |
1879 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); | |
1880 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, | |
1881 | dir_id, "default", 7, 0); | |
1882 | if (di && !IS_ERR(di)) { | |
1883 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); | |
1884 | if (key.objectid == root->root_key.objectid) { | |
72de6b53 GS |
1885 | ret = -EPERM; |
1886 | btrfs_err(root->fs_info, "deleting default subvolume " | |
1887 | "%llu is not allowed", key.objectid); | |
175a2b87 JB |
1888 | goto out; |
1889 | } | |
1890 | btrfs_release_path(path); | |
1891 | } | |
1892 | ||
76dda93c YZ |
1893 | key.objectid = root->root_key.objectid; |
1894 | key.type = BTRFS_ROOT_REF_KEY; | |
1895 | key.offset = (u64)-1; | |
1896 | ||
1897 | ret = btrfs_search_slot(NULL, root->fs_info->tree_root, | |
1898 | &key, path, 0, 0); | |
1899 | if (ret < 0) | |
1900 | goto out; | |
1901 | BUG_ON(ret == 0); | |
1902 | ||
1903 | ret = 0; | |
1904 | if (path->slots[0] > 0) { | |
1905 | path->slots[0]--; | |
1906 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1907 | if (key.objectid == root->root_key.objectid && | |
1908 | key.type == BTRFS_ROOT_REF_KEY) | |
1909 | ret = -ENOTEMPTY; | |
1910 | } | |
1911 | out: | |
1912 | btrfs_free_path(path); | |
1913 | return ret; | |
1914 | } | |
1915 | ||
ac8e9819 CM |
1916 | static noinline int key_in_sk(struct btrfs_key *key, |
1917 | struct btrfs_ioctl_search_key *sk) | |
1918 | { | |
abc6e134 CM |
1919 | struct btrfs_key test; |
1920 | int ret; | |
1921 | ||
1922 | test.objectid = sk->min_objectid; | |
1923 | test.type = sk->min_type; | |
1924 | test.offset = sk->min_offset; | |
1925 | ||
1926 | ret = btrfs_comp_cpu_keys(key, &test); | |
1927 | if (ret < 0) | |
ac8e9819 | 1928 | return 0; |
abc6e134 CM |
1929 | |
1930 | test.objectid = sk->max_objectid; | |
1931 | test.type = sk->max_type; | |
1932 | test.offset = sk->max_offset; | |
1933 | ||
1934 | ret = btrfs_comp_cpu_keys(key, &test); | |
1935 | if (ret > 0) | |
ac8e9819 CM |
1936 | return 0; |
1937 | return 1; | |
1938 | } | |
1939 | ||
1940 | static noinline int copy_to_sk(struct btrfs_root *root, | |
1941 | struct btrfs_path *path, | |
1942 | struct btrfs_key *key, | |
1943 | struct btrfs_ioctl_search_key *sk, | |
9b6e817d | 1944 | size_t *buf_size, |
ba346b35 | 1945 | char __user *ubuf, |
ac8e9819 CM |
1946 | unsigned long *sk_offset, |
1947 | int *num_found) | |
1948 | { | |
1949 | u64 found_transid; | |
1950 | struct extent_buffer *leaf; | |
1951 | struct btrfs_ioctl_search_header sh; | |
dd81d459 | 1952 | struct btrfs_key test; |
ac8e9819 CM |
1953 | unsigned long item_off; |
1954 | unsigned long item_len; | |
1955 | int nritems; | |
1956 | int i; | |
1957 | int slot; | |
ac8e9819 CM |
1958 | int ret = 0; |
1959 | ||
1960 | leaf = path->nodes[0]; | |
1961 | slot = path->slots[0]; | |
1962 | nritems = btrfs_header_nritems(leaf); | |
1963 | ||
1964 | if (btrfs_header_generation(leaf) > sk->max_transid) { | |
1965 | i = nritems; | |
1966 | goto advance_key; | |
1967 | } | |
1968 | found_transid = btrfs_header_generation(leaf); | |
1969 | ||
1970 | for (i = slot; i < nritems; i++) { | |
1971 | item_off = btrfs_item_ptr_offset(leaf, i); | |
1972 | item_len = btrfs_item_size_nr(leaf, i); | |
1973 | ||
03b71c6c GP |
1974 | btrfs_item_key_to_cpu(leaf, key, i); |
1975 | if (!key_in_sk(key, sk)) | |
1976 | continue; | |
1977 | ||
9b6e817d | 1978 | if (sizeof(sh) + item_len > *buf_size) { |
8f5f6178 GH |
1979 | if (*num_found) { |
1980 | ret = 1; | |
1981 | goto out; | |
1982 | } | |
1983 | ||
1984 | /* | |
1985 | * return one empty item back for v1, which does not | |
1986 | * handle -EOVERFLOW | |
1987 | */ | |
1988 | ||
9b6e817d | 1989 | *buf_size = sizeof(sh) + item_len; |
ac8e9819 | 1990 | item_len = 0; |
8f5f6178 GH |
1991 | ret = -EOVERFLOW; |
1992 | } | |
ac8e9819 | 1993 | |
9b6e817d | 1994 | if (sizeof(sh) + item_len + *sk_offset > *buf_size) { |
ac8e9819 | 1995 | ret = 1; |
25c9bc2e | 1996 | goto out; |
ac8e9819 CM |
1997 | } |
1998 | ||
ac8e9819 CM |
1999 | sh.objectid = key->objectid; |
2000 | sh.offset = key->offset; | |
2001 | sh.type = key->type; | |
2002 | sh.len = item_len; | |
2003 | sh.transid = found_transid; | |
2004 | ||
2005 | /* copy search result header */ | |
ba346b35 GH |
2006 | if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) { |
2007 | ret = -EFAULT; | |
2008 | goto out; | |
2009 | } | |
2010 | ||
ac8e9819 CM |
2011 | *sk_offset += sizeof(sh); |
2012 | ||
2013 | if (item_len) { | |
ba346b35 | 2014 | char __user *up = ubuf + *sk_offset; |
ac8e9819 | 2015 | /* copy the item */ |
ba346b35 GH |
2016 | if (read_extent_buffer_to_user(leaf, up, |
2017 | item_off, item_len)) { | |
2018 | ret = -EFAULT; | |
2019 | goto out; | |
2020 | } | |
2021 | ||
ac8e9819 | 2022 | *sk_offset += item_len; |
ac8e9819 | 2023 | } |
e2156867 | 2024 | (*num_found)++; |
ac8e9819 | 2025 | |
8f5f6178 GH |
2026 | if (ret) /* -EOVERFLOW from above */ |
2027 | goto out; | |
2028 | ||
25c9bc2e GH |
2029 | if (*num_found >= sk->nr_items) { |
2030 | ret = 1; | |
2031 | goto out; | |
2032 | } | |
ac8e9819 CM |
2033 | } |
2034 | advance_key: | |
abc6e134 | 2035 | ret = 0; |
dd81d459 NA |
2036 | test.objectid = sk->max_objectid; |
2037 | test.type = sk->max_type; | |
2038 | test.offset = sk->max_offset; | |
2039 | if (btrfs_comp_cpu_keys(key, &test) >= 0) | |
2040 | ret = 1; | |
2041 | else if (key->offset < (u64)-1) | |
ac8e9819 | 2042 | key->offset++; |
dd81d459 | 2043 | else if (key->type < (u8)-1) { |
abc6e134 | 2044 | key->offset = 0; |
ac8e9819 | 2045 | key->type++; |
dd81d459 | 2046 | } else if (key->objectid < (u64)-1) { |
abc6e134 CM |
2047 | key->offset = 0; |
2048 | key->type = 0; | |
ac8e9819 | 2049 | key->objectid++; |
abc6e134 CM |
2050 | } else |
2051 | ret = 1; | |
25c9bc2e | 2052 | out: |
ba346b35 GH |
2053 | /* |
2054 | * 0: all items from this leaf copied, continue with next | |
2055 | * 1: * more items can be copied, but unused buffer is too small | |
2056 | * * all items were found | |
2057 | * Either way, it will stops the loop which iterates to the next | |
2058 | * leaf | |
2059 | * -EOVERFLOW: item was to large for buffer | |
2060 | * -EFAULT: could not copy extent buffer back to userspace | |
2061 | */ | |
ac8e9819 CM |
2062 | return ret; |
2063 | } | |
2064 | ||
2065 | static noinline int search_ioctl(struct inode *inode, | |
12544442 | 2066 | struct btrfs_ioctl_search_key *sk, |
9b6e817d | 2067 | size_t *buf_size, |
ba346b35 | 2068 | char __user *ubuf) |
ac8e9819 CM |
2069 | { |
2070 | struct btrfs_root *root; | |
2071 | struct btrfs_key key; | |
ac8e9819 | 2072 | struct btrfs_path *path; |
ac8e9819 CM |
2073 | struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; |
2074 | int ret; | |
2075 | int num_found = 0; | |
2076 | unsigned long sk_offset = 0; | |
2077 | ||
9b6e817d GH |
2078 | if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) { |
2079 | *buf_size = sizeof(struct btrfs_ioctl_search_header); | |
12544442 | 2080 | return -EOVERFLOW; |
9b6e817d | 2081 | } |
12544442 | 2082 | |
ac8e9819 CM |
2083 | path = btrfs_alloc_path(); |
2084 | if (!path) | |
2085 | return -ENOMEM; | |
2086 | ||
2087 | if (sk->tree_id == 0) { | |
2088 | /* search the root of the inode that was passed */ | |
2089 | root = BTRFS_I(inode)->root; | |
2090 | } else { | |
2091 | key.objectid = sk->tree_id; | |
2092 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2093 | key.offset = (u64)-1; | |
2094 | root = btrfs_read_fs_root_no_name(info, &key); | |
2095 | if (IS_ERR(root)) { | |
ac8e9819 CM |
2096 | btrfs_free_path(path); |
2097 | return -ENOENT; | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | key.objectid = sk->min_objectid; | |
2102 | key.type = sk->min_type; | |
2103 | key.offset = sk->min_offset; | |
2104 | ||
67871254 | 2105 | while (1) { |
6174d3cb | 2106 | ret = btrfs_search_forward(root, &key, path, sk->min_transid); |
ac8e9819 CM |
2107 | if (ret != 0) { |
2108 | if (ret > 0) | |
2109 | ret = 0; | |
2110 | goto err; | |
2111 | } | |
ba346b35 | 2112 | ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf, |
ac8e9819 | 2113 | &sk_offset, &num_found); |
b3b4aa74 | 2114 | btrfs_release_path(path); |
25c9bc2e | 2115 | if (ret) |
ac8e9819 CM |
2116 | break; |
2117 | ||
2118 | } | |
8f5f6178 GH |
2119 | if (ret > 0) |
2120 | ret = 0; | |
ac8e9819 CM |
2121 | err: |
2122 | sk->nr_items = num_found; | |
2123 | btrfs_free_path(path); | |
2124 | return ret; | |
2125 | } | |
2126 | ||
2127 | static noinline int btrfs_ioctl_tree_search(struct file *file, | |
2128 | void __user *argp) | |
2129 | { | |
ba346b35 GH |
2130 | struct btrfs_ioctl_search_args __user *uargs; |
2131 | struct btrfs_ioctl_search_key sk; | |
9b6e817d GH |
2132 | struct inode *inode; |
2133 | int ret; | |
2134 | size_t buf_size; | |
ac8e9819 CM |
2135 | |
2136 | if (!capable(CAP_SYS_ADMIN)) | |
2137 | return -EPERM; | |
2138 | ||
ba346b35 GH |
2139 | uargs = (struct btrfs_ioctl_search_args __user *)argp; |
2140 | ||
2141 | if (copy_from_user(&sk, &uargs->key, sizeof(sk))) | |
2142 | return -EFAULT; | |
ac8e9819 | 2143 | |
ba346b35 | 2144 | buf_size = sizeof(uargs->buf); |
ac8e9819 | 2145 | |
496ad9aa | 2146 | inode = file_inode(file); |
ba346b35 | 2147 | ret = search_ioctl(inode, &sk, &buf_size, uargs->buf); |
8f5f6178 GH |
2148 | |
2149 | /* | |
2150 | * In the origin implementation an overflow is handled by returning a | |
2151 | * search header with a len of zero, so reset ret. | |
2152 | */ | |
2153 | if (ret == -EOVERFLOW) | |
2154 | ret = 0; | |
2155 | ||
ba346b35 | 2156 | if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk))) |
ac8e9819 | 2157 | ret = -EFAULT; |
ac8e9819 CM |
2158 | return ret; |
2159 | } | |
2160 | ||
cc68a8a5 GH |
2161 | static noinline int btrfs_ioctl_tree_search_v2(struct file *file, |
2162 | void __user *argp) | |
2163 | { | |
2164 | struct btrfs_ioctl_search_args_v2 __user *uarg; | |
2165 | struct btrfs_ioctl_search_args_v2 args; | |
2166 | struct inode *inode; | |
2167 | int ret; | |
2168 | size_t buf_size; | |
ee22184b | 2169 | const size_t buf_limit = SZ_16M; |
cc68a8a5 GH |
2170 | |
2171 | if (!capable(CAP_SYS_ADMIN)) | |
2172 | return -EPERM; | |
2173 | ||
2174 | /* copy search header and buffer size */ | |
2175 | uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp; | |
2176 | if (copy_from_user(&args, uarg, sizeof(args))) | |
2177 | return -EFAULT; | |
2178 | ||
2179 | buf_size = args.buf_size; | |
2180 | ||
2181 | if (buf_size < sizeof(struct btrfs_ioctl_search_header)) | |
2182 | return -EOVERFLOW; | |
2183 | ||
2184 | /* limit result size to 16MB */ | |
2185 | if (buf_size > buf_limit) | |
2186 | buf_size = buf_limit; | |
2187 | ||
2188 | inode = file_inode(file); | |
2189 | ret = search_ioctl(inode, &args.key, &buf_size, | |
2190 | (char *)(&uarg->buf[0])); | |
2191 | if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key))) | |
2192 | ret = -EFAULT; | |
2193 | else if (ret == -EOVERFLOW && | |
2194 | copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size))) | |
2195 | ret = -EFAULT; | |
2196 | ||
ac8e9819 CM |
2197 | return ret; |
2198 | } | |
2199 | ||
98d377a0 | 2200 | /* |
ac8e9819 CM |
2201 | * Search INODE_REFs to identify path name of 'dirid' directory |
2202 | * in a 'tree_id' tree. and sets path name to 'name'. | |
2203 | */ | |
98d377a0 TH |
2204 | static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, |
2205 | u64 tree_id, u64 dirid, char *name) | |
2206 | { | |
2207 | struct btrfs_root *root; | |
2208 | struct btrfs_key key; | |
ac8e9819 | 2209 | char *ptr; |
98d377a0 TH |
2210 | int ret = -1; |
2211 | int slot; | |
2212 | int len; | |
2213 | int total_len = 0; | |
2214 | struct btrfs_inode_ref *iref; | |
2215 | struct extent_buffer *l; | |
2216 | struct btrfs_path *path; | |
2217 | ||
2218 | if (dirid == BTRFS_FIRST_FREE_OBJECTID) { | |
2219 | name[0]='\0'; | |
2220 | return 0; | |
2221 | } | |
2222 | ||
2223 | path = btrfs_alloc_path(); | |
2224 | if (!path) | |
2225 | return -ENOMEM; | |
2226 | ||
ac8e9819 | 2227 | ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; |
98d377a0 TH |
2228 | |
2229 | key.objectid = tree_id; | |
2230 | key.type = BTRFS_ROOT_ITEM_KEY; | |
2231 | key.offset = (u64)-1; | |
2232 | root = btrfs_read_fs_root_no_name(info, &key); | |
2233 | if (IS_ERR(root)) { | |
f14d104d | 2234 | btrfs_err(info, "could not find root %llu", tree_id); |
8ad6fcab CM |
2235 | ret = -ENOENT; |
2236 | goto out; | |
98d377a0 TH |
2237 | } |
2238 | ||
2239 | key.objectid = dirid; | |
2240 | key.type = BTRFS_INODE_REF_KEY; | |
8ad6fcab | 2241 | key.offset = (u64)-1; |
98d377a0 | 2242 | |
67871254 | 2243 | while (1) { |
98d377a0 TH |
2244 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2245 | if (ret < 0) | |
2246 | goto out; | |
18674c6c FDBM |
2247 | else if (ret > 0) { |
2248 | ret = btrfs_previous_item(root, path, dirid, | |
2249 | BTRFS_INODE_REF_KEY); | |
2250 | if (ret < 0) | |
2251 | goto out; | |
2252 | else if (ret > 0) { | |
2253 | ret = -ENOENT; | |
2254 | goto out; | |
2255 | } | |
2256 | } | |
98d377a0 TH |
2257 | |
2258 | l = path->nodes[0]; | |
2259 | slot = path->slots[0]; | |
2260 | btrfs_item_key_to_cpu(l, &key, slot); | |
2261 | ||
98d377a0 TH |
2262 | iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); |
2263 | len = btrfs_inode_ref_name_len(l, iref); | |
2264 | ptr -= len + 1; | |
2265 | total_len += len + 1; | |
a696cf35 FDBM |
2266 | if (ptr < name) { |
2267 | ret = -ENAMETOOLONG; | |
98d377a0 | 2268 | goto out; |
a696cf35 | 2269 | } |
98d377a0 TH |
2270 | |
2271 | *(ptr + len) = '/'; | |
67871254 | 2272 | read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len); |
98d377a0 TH |
2273 | |
2274 | if (key.offset == BTRFS_FIRST_FREE_OBJECTID) | |
2275 | break; | |
2276 | ||
b3b4aa74 | 2277 | btrfs_release_path(path); |
98d377a0 | 2278 | key.objectid = key.offset; |
8ad6fcab | 2279 | key.offset = (u64)-1; |
98d377a0 | 2280 | dirid = key.objectid; |
98d377a0 | 2281 | } |
77906a50 | 2282 | memmove(name, ptr, total_len); |
67871254 | 2283 | name[total_len] = '\0'; |
98d377a0 TH |
2284 | ret = 0; |
2285 | out: | |
2286 | btrfs_free_path(path); | |
ac8e9819 CM |
2287 | return ret; |
2288 | } | |
2289 | ||
2290 | static noinline int btrfs_ioctl_ino_lookup(struct file *file, | |
2291 | void __user *argp) | |
2292 | { | |
2293 | struct btrfs_ioctl_ino_lookup_args *args; | |
2294 | struct inode *inode; | |
01b810b8 | 2295 | int ret = 0; |
ac8e9819 | 2296 | |
2354d08f JL |
2297 | args = memdup_user(argp, sizeof(*args)); |
2298 | if (IS_ERR(args)) | |
2299 | return PTR_ERR(args); | |
c2b96929 | 2300 | |
496ad9aa | 2301 | inode = file_inode(file); |
ac8e9819 | 2302 | |
01b810b8 DS |
2303 | /* |
2304 | * Unprivileged query to obtain the containing subvolume root id. The | |
2305 | * path is reset so it's consistent with btrfs_search_path_in_tree. | |
2306 | */ | |
1b53ac4d CM |
2307 | if (args->treeid == 0) |
2308 | args->treeid = BTRFS_I(inode)->root->root_key.objectid; | |
2309 | ||
01b810b8 DS |
2310 | if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) { |
2311 | args->name[0] = 0; | |
2312 | goto out; | |
2313 | } | |
2314 | ||
2315 | if (!capable(CAP_SYS_ADMIN)) { | |
2316 | ret = -EPERM; | |
2317 | goto out; | |
2318 | } | |
2319 | ||
ac8e9819 CM |
2320 | ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, |
2321 | args->treeid, args->objectid, | |
2322 | args->name); | |
2323 | ||
01b810b8 | 2324 | out: |
ac8e9819 CM |
2325 | if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) |
2326 | ret = -EFAULT; | |
2327 | ||
2328 | kfree(args); | |
98d377a0 TH |
2329 | return ret; |
2330 | } | |
2331 | ||
76dda93c YZ |
2332 | static noinline int btrfs_ioctl_snap_destroy(struct file *file, |
2333 | void __user *arg) | |
2334 | { | |
54563d41 | 2335 | struct dentry *parent = file->f_path.dentry; |
76dda93c | 2336 | struct dentry *dentry; |
2b0143b5 | 2337 | struct inode *dir = d_inode(parent); |
76dda93c YZ |
2338 | struct inode *inode; |
2339 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2340 | struct btrfs_root *dest = NULL; | |
2341 | struct btrfs_ioctl_vol_args *vol_args; | |
2342 | struct btrfs_trans_handle *trans; | |
c58aaad2 | 2343 | struct btrfs_block_rsv block_rsv; |
521e0546 | 2344 | u64 root_flags; |
c58aaad2 | 2345 | u64 qgroup_reserved; |
76dda93c YZ |
2346 | int namelen; |
2347 | int ret; | |
2348 | int err = 0; | |
2349 | ||
76dda93c YZ |
2350 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
2351 | if (IS_ERR(vol_args)) | |
2352 | return PTR_ERR(vol_args); | |
2353 | ||
2354 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; | |
2355 | namelen = strlen(vol_args->name); | |
2356 | if (strchr(vol_args->name, '/') || | |
2357 | strncmp(vol_args->name, "..", namelen) == 0) { | |
2358 | err = -EINVAL; | |
2359 | goto out; | |
2360 | } | |
2361 | ||
a561be71 | 2362 | err = mnt_want_write_file(file); |
76dda93c YZ |
2363 | if (err) |
2364 | goto out; | |
2365 | ||
521e0546 | 2366 | |
5c50c9b8 DS |
2367 | err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT); |
2368 | if (err == -EINTR) | |
e43f998e | 2369 | goto out_drop_write; |
76dda93c YZ |
2370 | dentry = lookup_one_len(vol_args->name, parent, namelen); |
2371 | if (IS_ERR(dentry)) { | |
2372 | err = PTR_ERR(dentry); | |
2373 | goto out_unlock_dir; | |
2374 | } | |
2375 | ||
2b0143b5 | 2376 | if (d_really_is_negative(dentry)) { |
76dda93c YZ |
2377 | err = -ENOENT; |
2378 | goto out_dput; | |
2379 | } | |
2380 | ||
2b0143b5 | 2381 | inode = d_inode(dentry); |
4260f7c7 | 2382 | dest = BTRFS_I(inode)->root; |
67871254 | 2383 | if (!capable(CAP_SYS_ADMIN)) { |
4260f7c7 SW |
2384 | /* |
2385 | * Regular user. Only allow this with a special mount | |
2386 | * option, when the user has write+exec access to the | |
2387 | * subvol root, and when rmdir(2) would have been | |
2388 | * allowed. | |
2389 | * | |
2390 | * Note that this is _not_ check that the subvol is | |
2391 | * empty or doesn't contain data that we wouldn't | |
2392 | * otherwise be able to delete. | |
2393 | * | |
2394 | * Users who want to delete empty subvols should try | |
2395 | * rmdir(2). | |
2396 | */ | |
2397 | err = -EPERM; | |
2398 | if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) | |
2399 | goto out_dput; | |
2400 | ||
2401 | /* | |
2402 | * Do not allow deletion if the parent dir is the same | |
2403 | * as the dir to be deleted. That means the ioctl | |
2404 | * must be called on the dentry referencing the root | |
2405 | * of the subvol, not a random directory contained | |
2406 | * within it. | |
2407 | */ | |
2408 | err = -EINVAL; | |
2409 | if (root == dest) | |
2410 | goto out_dput; | |
2411 | ||
2412 | err = inode_permission(inode, MAY_WRITE | MAY_EXEC); | |
2413 | if (err) | |
2414 | goto out_dput; | |
4260f7c7 SW |
2415 | } |
2416 | ||
5c39da5b MX |
2417 | /* check if subvolume may be deleted by a user */ |
2418 | err = btrfs_may_delete(dir, dentry, 1); | |
2419 | if (err) | |
2420 | goto out_dput; | |
2421 | ||
33345d01 | 2422 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { |
76dda93c YZ |
2423 | err = -EINVAL; |
2424 | goto out_dput; | |
2425 | } | |
2426 | ||
5955102c | 2427 | inode_lock(inode); |
521e0546 DS |
2428 | |
2429 | /* | |
2430 | * Don't allow to delete a subvolume with send in progress. This is | |
2431 | * inside the i_mutex so the error handling that has to drop the bit | |
2432 | * again is not run concurrently. | |
2433 | */ | |
2434 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2435 | root_flags = btrfs_root_flags(&dest->root_item); |
2436 | if (dest->send_in_progress == 0) { | |
2437 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2438 | root_flags | BTRFS_ROOT_SUBVOL_DEAD); |
2439 | spin_unlock(&dest->root_item_lock); | |
2440 | } else { | |
2441 | spin_unlock(&dest->root_item_lock); | |
2442 | btrfs_warn(root->fs_info, | |
2443 | "Attempt to delete subvolume %llu during send", | |
c55bfa67 | 2444 | dest->root_key.objectid); |
521e0546 | 2445 | err = -EPERM; |
909e26dc | 2446 | goto out_unlock_inode; |
521e0546 DS |
2447 | } |
2448 | ||
76dda93c YZ |
2449 | down_write(&root->fs_info->subvol_sem); |
2450 | ||
2451 | err = may_destroy_subvol(dest); | |
2452 | if (err) | |
2453 | goto out_up_write; | |
2454 | ||
c58aaad2 MX |
2455 | btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP); |
2456 | /* | |
2457 | * One for dir inode, two for dir entries, two for root | |
2458 | * ref/backref. | |
2459 | */ | |
2460 | err = btrfs_subvolume_reserve_metadata(root, &block_rsv, | |
ee3441b4 | 2461 | 5, &qgroup_reserved, true); |
c58aaad2 MX |
2462 | if (err) |
2463 | goto out_up_write; | |
2464 | ||
a22285a6 YZ |
2465 | trans = btrfs_start_transaction(root, 0); |
2466 | if (IS_ERR(trans)) { | |
2467 | err = PTR_ERR(trans); | |
c58aaad2 | 2468 | goto out_release; |
a22285a6 | 2469 | } |
c58aaad2 MX |
2470 | trans->block_rsv = &block_rsv; |
2471 | trans->bytes_reserved = block_rsv.size; | |
a22285a6 | 2472 | |
76dda93c YZ |
2473 | ret = btrfs_unlink_subvol(trans, root, dir, |
2474 | dest->root_key.objectid, | |
2475 | dentry->d_name.name, | |
2476 | dentry->d_name.len); | |
79787eaa JM |
2477 | if (ret) { |
2478 | err = ret; | |
2479 | btrfs_abort_transaction(trans, root, ret); | |
2480 | goto out_end_trans; | |
2481 | } | |
76dda93c YZ |
2482 | |
2483 | btrfs_record_root_in_trans(trans, dest); | |
2484 | ||
2485 | memset(&dest->root_item.drop_progress, 0, | |
2486 | sizeof(dest->root_item.drop_progress)); | |
2487 | dest->root_item.drop_level = 0; | |
2488 | btrfs_set_root_refs(&dest->root_item, 0); | |
2489 | ||
27cdeb70 | 2490 | if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) { |
d68fc57b YZ |
2491 | ret = btrfs_insert_orphan_item(trans, |
2492 | root->fs_info->tree_root, | |
2493 | dest->root_key.objectid); | |
79787eaa JM |
2494 | if (ret) { |
2495 | btrfs_abort_transaction(trans, root, ret); | |
2496 | err = ret; | |
2497 | goto out_end_trans; | |
2498 | } | |
d68fc57b | 2499 | } |
dd5f9615 SB |
2500 | |
2501 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2502 | dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL, | |
2503 | dest->root_key.objectid); | |
2504 | if (ret && ret != -ENOENT) { | |
2505 | btrfs_abort_transaction(trans, root, ret); | |
2506 | err = ret; | |
2507 | goto out_end_trans; | |
2508 | } | |
2509 | if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) { | |
2510 | ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
2511 | dest->root_item.received_uuid, | |
2512 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
2513 | dest->root_key.objectid); | |
2514 | if (ret && ret != -ENOENT) { | |
2515 | btrfs_abort_transaction(trans, root, ret); | |
2516 | err = ret; | |
2517 | goto out_end_trans; | |
2518 | } | |
2519 | } | |
2520 | ||
79787eaa | 2521 | out_end_trans: |
c58aaad2 MX |
2522 | trans->block_rsv = NULL; |
2523 | trans->bytes_reserved = 0; | |
531cb13f | 2524 | ret = btrfs_end_transaction(trans, root); |
79787eaa JM |
2525 | if (ret && !err) |
2526 | err = ret; | |
76dda93c | 2527 | inode->i_flags |= S_DEAD; |
c58aaad2 MX |
2528 | out_release: |
2529 | btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved); | |
76dda93c YZ |
2530 | out_up_write: |
2531 | up_write(&root->fs_info->subvol_sem); | |
521e0546 DS |
2532 | if (err) { |
2533 | spin_lock(&dest->root_item_lock); | |
c55bfa67 FM |
2534 | root_flags = btrfs_root_flags(&dest->root_item); |
2535 | btrfs_set_root_flags(&dest->root_item, | |
521e0546 DS |
2536 | root_flags & ~BTRFS_ROOT_SUBVOL_DEAD); |
2537 | spin_unlock(&dest->root_item_lock); | |
2538 | } | |
909e26dc | 2539 | out_unlock_inode: |
5955102c | 2540 | inode_unlock(inode); |
76dda93c | 2541 | if (!err) { |
64ad6c48 | 2542 | d_invalidate(dentry); |
76dda93c YZ |
2543 | btrfs_invalidate_inodes(dest); |
2544 | d_delete(dentry); | |
61155aa0 | 2545 | ASSERT(dest->send_in_progress == 0); |
fa6ac876 LB |
2546 | |
2547 | /* the last ref */ | |
57cdc8db DS |
2548 | if (dest->ino_cache_inode) { |
2549 | iput(dest->ino_cache_inode); | |
2550 | dest->ino_cache_inode = NULL; | |
fa6ac876 | 2551 | } |
76dda93c YZ |
2552 | } |
2553 | out_dput: | |
2554 | dput(dentry); | |
2555 | out_unlock_dir: | |
5955102c | 2556 | inode_unlock(dir); |
e43f998e | 2557 | out_drop_write: |
2a79f17e | 2558 | mnt_drop_write_file(file); |
76dda93c YZ |
2559 | out: |
2560 | kfree(vol_args); | |
2561 | return err; | |
2562 | } | |
2563 | ||
1e701a32 | 2564 | static int btrfs_ioctl_defrag(struct file *file, void __user *argp) |
f46b5a66 | 2565 | { |
496ad9aa | 2566 | struct inode *inode = file_inode(file); |
f46b5a66 | 2567 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1e701a32 | 2568 | struct btrfs_ioctl_defrag_range_args *range; |
c146afad YZ |
2569 | int ret; |
2570 | ||
25122d15 ID |
2571 | ret = mnt_want_write_file(file); |
2572 | if (ret) | |
2573 | return ret; | |
b83cc969 | 2574 | |
25122d15 ID |
2575 | if (btrfs_root_readonly(root)) { |
2576 | ret = -EROFS; | |
2577 | goto out; | |
5ac00add | 2578 | } |
f46b5a66 CH |
2579 | |
2580 | switch (inode->i_mode & S_IFMT) { | |
2581 | case S_IFDIR: | |
e441d54d CM |
2582 | if (!capable(CAP_SYS_ADMIN)) { |
2583 | ret = -EPERM; | |
2584 | goto out; | |
2585 | } | |
de78b51a | 2586 | ret = btrfs_defrag_root(root); |
8929ecfa YZ |
2587 | if (ret) |
2588 | goto out; | |
de78b51a | 2589 | ret = btrfs_defrag_root(root->fs_info->extent_root); |
f46b5a66 CH |
2590 | break; |
2591 | case S_IFREG: | |
e441d54d CM |
2592 | if (!(file->f_mode & FMODE_WRITE)) { |
2593 | ret = -EINVAL; | |
2594 | goto out; | |
2595 | } | |
1e701a32 CM |
2596 | |
2597 | range = kzalloc(sizeof(*range), GFP_KERNEL); | |
2598 | if (!range) { | |
2599 | ret = -ENOMEM; | |
2600 | goto out; | |
2601 | } | |
2602 | ||
2603 | if (argp) { | |
2604 | if (copy_from_user(range, argp, | |
2605 | sizeof(*range))) { | |
2606 | ret = -EFAULT; | |
2607 | kfree(range); | |
683be16e | 2608 | goto out; |
1e701a32 CM |
2609 | } |
2610 | /* compression requires us to start the IO */ | |
2611 | if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { | |
2612 | range->flags |= BTRFS_DEFRAG_RANGE_START_IO; | |
2613 | range->extent_thresh = (u32)-1; | |
2614 | } | |
2615 | } else { | |
2616 | /* the rest are all set to zero by kzalloc */ | |
2617 | range->len = (u64)-1; | |
2618 | } | |
496ad9aa | 2619 | ret = btrfs_defrag_file(file_inode(file), file, |
4cb5300b CM |
2620 | range, 0, 0); |
2621 | if (ret > 0) | |
2622 | ret = 0; | |
1e701a32 | 2623 | kfree(range); |
f46b5a66 | 2624 | break; |
8929ecfa YZ |
2625 | default: |
2626 | ret = -EINVAL; | |
f46b5a66 | 2627 | } |
e441d54d | 2628 | out: |
25122d15 | 2629 | mnt_drop_write_file(file); |
e441d54d | 2630 | return ret; |
f46b5a66 CH |
2631 | } |
2632 | ||
b2950863 | 2633 | static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
f46b5a66 CH |
2634 | { |
2635 | struct btrfs_ioctl_vol_args *vol_args; | |
2636 | int ret; | |
2637 | ||
e441d54d CM |
2638 | if (!capable(CAP_SYS_ADMIN)) |
2639 | return -EPERM; | |
2640 | ||
5ac00add SB |
2641 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2642 | 1)) { | |
e57138b3 | 2643 | return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
c9e9f97b ID |
2644 | } |
2645 | ||
5ac00add | 2646 | mutex_lock(&root->fs_info->volume_mutex); |
dae7b665 | 2647 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2648 | if (IS_ERR(vol_args)) { |
2649 | ret = PTR_ERR(vol_args); | |
2650 | goto out; | |
2651 | } | |
f46b5a66 | 2652 | |
5516e595 | 2653 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 CH |
2654 | ret = btrfs_init_new_device(root, vol_args->name); |
2655 | ||
43d20761 AJ |
2656 | if (!ret) |
2657 | btrfs_info(root->fs_info, "disk added %s",vol_args->name); | |
2658 | ||
f46b5a66 | 2659 | kfree(vol_args); |
c9e9f97b ID |
2660 | out: |
2661 | mutex_unlock(&root->fs_info->volume_mutex); | |
5ac00add | 2662 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
f46b5a66 CH |
2663 | return ret; |
2664 | } | |
2665 | ||
da24927b | 2666 | static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) |
f46b5a66 | 2667 | { |
496ad9aa | 2668 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
f46b5a66 CH |
2669 | struct btrfs_ioctl_vol_args *vol_args; |
2670 | int ret; | |
2671 | ||
e441d54d CM |
2672 | if (!capable(CAP_SYS_ADMIN)) |
2673 | return -EPERM; | |
2674 | ||
da24927b MX |
2675 | ret = mnt_want_write_file(file); |
2676 | if (ret) | |
2677 | return ret; | |
c146afad | 2678 | |
dae7b665 | 2679 | vol_args = memdup_user(arg, sizeof(*vol_args)); |
c9e9f97b ID |
2680 | if (IS_ERR(vol_args)) { |
2681 | ret = PTR_ERR(vol_args); | |
c47ca32d | 2682 | goto err_drop; |
c9e9f97b | 2683 | } |
f46b5a66 | 2684 | |
5516e595 | 2685 | vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; |
f46b5a66 | 2686 | |
183860f6 AJ |
2687 | if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, |
2688 | 1)) { | |
2689 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; | |
2690 | goto out; | |
2691 | } | |
2692 | ||
2693 | mutex_lock(&root->fs_info->volume_mutex); | |
2694 | ret = btrfs_rm_device(root, vol_args->name); | |
c9e9f97b | 2695 | mutex_unlock(&root->fs_info->volume_mutex); |
5ac00add | 2696 | atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); |
183860f6 | 2697 | |
ec95d491 AJ |
2698 | if (!ret) |
2699 | btrfs_info(root->fs_info, "disk deleted %s",vol_args->name); | |
2700 | ||
183860f6 AJ |
2701 | out: |
2702 | kfree(vol_args); | |
c47ca32d | 2703 | err_drop: |
4ac20c70 | 2704 | mnt_drop_write_file(file); |
f46b5a66 CH |
2705 | return ret; |
2706 | } | |
2707 | ||
475f6387 JS |
2708 | static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg) |
2709 | { | |
027ed2f0 | 2710 | struct btrfs_ioctl_fs_info_args *fi_args; |
475f6387 | 2711 | struct btrfs_device *device; |
475f6387 | 2712 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; |
027ed2f0 | 2713 | int ret = 0; |
475f6387 | 2714 | |
027ed2f0 LZ |
2715 | fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL); |
2716 | if (!fi_args) | |
2717 | return -ENOMEM; | |
2718 | ||
f7171750 | 2719 | mutex_lock(&fs_devices->device_list_mutex); |
027ed2f0 LZ |
2720 | fi_args->num_devices = fs_devices->num_devices; |
2721 | memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid)); | |
475f6387 | 2722 | |
d7641a49 | 2723 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
027ed2f0 LZ |
2724 | if (device->devid > fi_args->max_id) |
2725 | fi_args->max_id = device->devid; | |
475f6387 JS |
2726 | } |
2727 | mutex_unlock(&fs_devices->device_list_mutex); | |
2728 | ||
80a773fb DS |
2729 | fi_args->nodesize = root->fs_info->super_copy->nodesize; |
2730 | fi_args->sectorsize = root->fs_info->super_copy->sectorsize; | |
2731 | fi_args->clone_alignment = root->fs_info->super_copy->sectorsize; | |
2732 | ||
027ed2f0 LZ |
2733 | if (copy_to_user(arg, fi_args, sizeof(*fi_args))) |
2734 | ret = -EFAULT; | |
475f6387 | 2735 | |
027ed2f0 LZ |
2736 | kfree(fi_args); |
2737 | return ret; | |
475f6387 JS |
2738 | } |
2739 | ||
2740 | static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) | |
2741 | { | |
2742 | struct btrfs_ioctl_dev_info_args *di_args; | |
2743 | struct btrfs_device *dev; | |
2744 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
2745 | int ret = 0; | |
2746 | char *s_uuid = NULL; | |
475f6387 | 2747 | |
475f6387 JS |
2748 | di_args = memdup_user(arg, sizeof(*di_args)); |
2749 | if (IS_ERR(di_args)) | |
2750 | return PTR_ERR(di_args); | |
2751 | ||
dd5f9615 | 2752 | if (!btrfs_is_empty_uuid(di_args->uuid)) |
475f6387 JS |
2753 | s_uuid = di_args->uuid; |
2754 | ||
2755 | mutex_lock(&fs_devices->device_list_mutex); | |
aa1b8cd4 | 2756 | dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); |
475f6387 JS |
2757 | |
2758 | if (!dev) { | |
2759 | ret = -ENODEV; | |
2760 | goto out; | |
2761 | } | |
2762 | ||
2763 | di_args->devid = dev->devid; | |
7cc8e58d MX |
2764 | di_args->bytes_used = btrfs_device_get_bytes_used(dev); |
2765 | di_args->total_bytes = btrfs_device_get_total_bytes(dev); | |
475f6387 | 2766 | memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); |
a27202fb | 2767 | if (dev->name) { |
606686ee JB |
2768 | struct rcu_string *name; |
2769 | ||
2770 | rcu_read_lock(); | |
2771 | name = rcu_dereference(dev->name); | |
2772 | strncpy(di_args->path, name->str, sizeof(di_args->path)); | |
2773 | rcu_read_unlock(); | |
a27202fb JM |
2774 | di_args->path[sizeof(di_args->path) - 1] = 0; |
2775 | } else { | |
99ba55ad | 2776 | di_args->path[0] = '\0'; |
a27202fb | 2777 | } |
475f6387 JS |
2778 | |
2779 | out: | |
55793c0d | 2780 | mutex_unlock(&fs_devices->device_list_mutex); |
475f6387 JS |
2781 | if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) |
2782 | ret = -EFAULT; | |
2783 | ||
2784 | kfree(di_args); | |
2785 | return ret; | |
2786 | } | |
2787 | ||
f4414602 | 2788 | static struct page *extent_same_get_page(struct inode *inode, pgoff_t index) |
416161db MF |
2789 | { |
2790 | struct page *page; | |
416161db | 2791 | |
416161db MF |
2792 | page = grab_cache_page(inode->i_mapping, index); |
2793 | if (!page) | |
31314002 | 2794 | return ERR_PTR(-ENOMEM); |
416161db MF |
2795 | |
2796 | if (!PageUptodate(page)) { | |
31314002 FM |
2797 | int ret; |
2798 | ||
2799 | ret = btrfs_readpage(NULL, page); | |
2800 | if (ret) | |
2801 | return ERR_PTR(ret); | |
416161db MF |
2802 | lock_page(page); |
2803 | if (!PageUptodate(page)) { | |
2804 | unlock_page(page); | |
2805 | page_cache_release(page); | |
31314002 FM |
2806 | return ERR_PTR(-EIO); |
2807 | } | |
2808 | if (page->mapping != inode->i_mapping) { | |
2809 | unlock_page(page); | |
2810 | page_cache_release(page); | |
2811 | return ERR_PTR(-EAGAIN); | |
416161db MF |
2812 | } |
2813 | } | |
416161db MF |
2814 | |
2815 | return page; | |
2816 | } | |
2817 | ||
f4414602 MF |
2818 | static int gather_extent_pages(struct inode *inode, struct page **pages, |
2819 | int num_pages, u64 off) | |
2820 | { | |
2821 | int i; | |
2822 | pgoff_t index = off >> PAGE_CACHE_SHIFT; | |
2823 | ||
2824 | for (i = 0; i < num_pages; i++) { | |
31314002 | 2825 | again: |
f4414602 | 2826 | pages[i] = extent_same_get_page(inode, index + i); |
31314002 FM |
2827 | if (IS_ERR(pages[i])) { |
2828 | int err = PTR_ERR(pages[i]); | |
2829 | ||
2830 | if (err == -EAGAIN) | |
2831 | goto again; | |
2832 | pages[i] = NULL; | |
2833 | return err; | |
2834 | } | |
f4414602 MF |
2835 | } |
2836 | return 0; | |
2837 | } | |
2838 | ||
e0bd70c6 FM |
2839 | static int lock_extent_range(struct inode *inode, u64 off, u64 len, |
2840 | bool retry_range_locking) | |
77fe20dc | 2841 | { |
e0bd70c6 FM |
2842 | /* |
2843 | * Do any pending delalloc/csum calculations on inode, one way or | |
2844 | * another, and lock file content. | |
2845 | * The locking order is: | |
2846 | * | |
2847 | * 1) pages | |
2848 | * 2) range in the inode's io tree | |
2849 | */ | |
77fe20dc MF |
2850 | while (1) { |
2851 | struct btrfs_ordered_extent *ordered; | |
2852 | lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); | |
2853 | ordered = btrfs_lookup_first_ordered_extent(inode, | |
2854 | off + len - 1); | |
ff5df9b8 FM |
2855 | if ((!ordered || |
2856 | ordered->file_offset + ordered->len <= off || | |
2857 | ordered->file_offset >= off + len) && | |
77fe20dc | 2858 | !test_range_bit(&BTRFS_I(inode)->io_tree, off, |
ff5df9b8 FM |
2859 | off + len - 1, EXTENT_DELALLOC, 0, NULL)) { |
2860 | if (ordered) | |
2861 | btrfs_put_ordered_extent(ordered); | |
77fe20dc | 2862 | break; |
ff5df9b8 | 2863 | } |
77fe20dc MF |
2864 | unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1); |
2865 | if (ordered) | |
2866 | btrfs_put_ordered_extent(ordered); | |
e0bd70c6 FM |
2867 | if (!retry_range_locking) |
2868 | return -EAGAIN; | |
77fe20dc MF |
2869 | btrfs_wait_ordered_range(inode, off, len); |
2870 | } | |
e0bd70c6 | 2871 | return 0; |
77fe20dc MF |
2872 | } |
2873 | ||
f4414602 | 2874 | static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2) |
416161db | 2875 | { |
5955102c AV |
2876 | inode_unlock(inode1); |
2877 | inode_unlock(inode2); | |
416161db MF |
2878 | } |
2879 | ||
f4414602 MF |
2880 | static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2) |
2881 | { | |
2882 | if (inode1 < inode2) | |
2883 | swap(inode1, inode2); | |
2884 | ||
5955102c AV |
2885 | inode_lock_nested(inode1, I_MUTEX_PARENT); |
2886 | inode_lock_nested(inode2, I_MUTEX_CHILD); | |
f4414602 MF |
2887 | } |
2888 | ||
2889 | static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1, | |
2890 | struct inode *inode2, u64 loff2, u64 len) | |
2891 | { | |
2892 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1); | |
2893 | unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1); | |
2894 | } | |
2895 | ||
e0bd70c6 FM |
2896 | static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1, |
2897 | struct inode *inode2, u64 loff2, u64 len, | |
2898 | bool retry_range_locking) | |
416161db | 2899 | { |
e0bd70c6 FM |
2900 | int ret; |
2901 | ||
416161db MF |
2902 | if (inode1 < inode2) { |
2903 | swap(inode1, inode2); | |
2904 | swap(loff1, loff2); | |
2905 | } | |
e0bd70c6 FM |
2906 | ret = lock_extent_range(inode1, loff1, len, retry_range_locking); |
2907 | if (ret) | |
2908 | return ret; | |
2909 | ret = lock_extent_range(inode2, loff2, len, retry_range_locking); | |
2910 | if (ret) | |
2911 | unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, | |
2912 | loff1 + len - 1); | |
2913 | return ret; | |
f4414602 MF |
2914 | } |
2915 | ||
2916 | struct cmp_pages { | |
2917 | int num_pages; | |
2918 | struct page **src_pages; | |
2919 | struct page **dst_pages; | |
2920 | }; | |
2921 | ||
2922 | static void btrfs_cmp_data_free(struct cmp_pages *cmp) | |
2923 | { | |
2924 | int i; | |
2925 | struct page *pg; | |
2926 | ||
2927 | for (i = 0; i < cmp->num_pages; i++) { | |
2928 | pg = cmp->src_pages[i]; | |
e0bd70c6 FM |
2929 | if (pg) { |
2930 | unlock_page(pg); | |
f4414602 | 2931 | page_cache_release(pg); |
e0bd70c6 | 2932 | } |
f4414602 | 2933 | pg = cmp->dst_pages[i]; |
e0bd70c6 FM |
2934 | if (pg) { |
2935 | unlock_page(pg); | |
f4414602 | 2936 | page_cache_release(pg); |
e0bd70c6 | 2937 | } |
f4414602 MF |
2938 | } |
2939 | kfree(cmp->src_pages); | |
2940 | kfree(cmp->dst_pages); | |
2941 | } | |
2942 | ||
2943 | static int btrfs_cmp_data_prepare(struct inode *src, u64 loff, | |
2944 | struct inode *dst, u64 dst_loff, | |
2945 | u64 len, struct cmp_pages *cmp) | |
2946 | { | |
2947 | int ret; | |
2948 | int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT; | |
2949 | struct page **src_pgarr, **dst_pgarr; | |
2950 | ||
2951 | /* | |
2952 | * We must gather up all the pages before we initiate our | |
2953 | * extent locking. We use an array for the page pointers. Size | |
2954 | * of the array is bounded by len, which is in turn bounded by | |
2955 | * BTRFS_MAX_DEDUPE_LEN. | |
2956 | */ | |
66722f7c DS |
2957 | src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); |
2958 | dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL); | |
f4414602 MF |
2959 | if (!src_pgarr || !dst_pgarr) { |
2960 | kfree(src_pgarr); | |
2961 | kfree(dst_pgarr); | |
2962 | return -ENOMEM; | |
416161db | 2963 | } |
f4414602 MF |
2964 | cmp->num_pages = num_pages; |
2965 | cmp->src_pages = src_pgarr; | |
2966 | cmp->dst_pages = dst_pgarr; | |
2967 | ||
2968 | ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff); | |
2969 | if (ret) | |
2970 | goto out; | |
2971 | ||
2972 | ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff); | |
2973 | ||
2974 | out: | |
2975 | if (ret) | |
2976 | btrfs_cmp_data_free(cmp); | |
2977 | return 0; | |
416161db MF |
2978 | } |
2979 | ||
2980 | static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst, | |
f4414602 | 2981 | u64 dst_loff, u64 len, struct cmp_pages *cmp) |
416161db MF |
2982 | { |
2983 | int ret = 0; | |
f4414602 | 2984 | int i; |
416161db MF |
2985 | struct page *src_page, *dst_page; |
2986 | unsigned int cmp_len = PAGE_CACHE_SIZE; | |
2987 | void *addr, *dst_addr; | |
2988 | ||
f4414602 | 2989 | i = 0; |
416161db MF |
2990 | while (len) { |
2991 | if (len < PAGE_CACHE_SIZE) | |
2992 | cmp_len = len; | |
2993 | ||
f4414602 MF |
2994 | BUG_ON(i >= cmp->num_pages); |
2995 | ||
2996 | src_page = cmp->src_pages[i]; | |
2997 | dst_page = cmp->dst_pages[i]; | |
e0bd70c6 FM |
2998 | ASSERT(PageLocked(src_page)); |
2999 | ASSERT(PageLocked(dst_page)); | |
f4414602 | 3000 | |
416161db MF |
3001 | addr = kmap_atomic(src_page); |
3002 | dst_addr = kmap_atomic(dst_page); | |
3003 | ||
3004 | flush_dcache_page(src_page); | |
3005 | flush_dcache_page(dst_page); | |
3006 | ||
3007 | if (memcmp(addr, dst_addr, cmp_len)) | |
2b3909f8 | 3008 | ret = -EBADE; |
416161db MF |
3009 | |
3010 | kunmap_atomic(addr); | |
3011 | kunmap_atomic(dst_addr); | |
416161db MF |
3012 | |
3013 | if (ret) | |
3014 | break; | |
3015 | ||
416161db | 3016 | len -= cmp_len; |
f4414602 | 3017 | i++; |
416161db MF |
3018 | } |
3019 | ||
3020 | return ret; | |
3021 | } | |
3022 | ||
e1d227a4 MF |
3023 | static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen, |
3024 | u64 olen) | |
416161db | 3025 | { |
e1d227a4 | 3026 | u64 len = *plen; |
416161db MF |
3027 | u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize; |
3028 | ||
e1d227a4 | 3029 | if (off + olen > inode->i_size || off + olen < off) |
416161db | 3030 | return -EINVAL; |
e1d227a4 MF |
3031 | |
3032 | /* if we extend to eof, continue to block boundary */ | |
3033 | if (off + len == inode->i_size) | |
3034 | *plen = len = ALIGN(inode->i_size, bs) - off; | |
3035 | ||
416161db MF |
3036 | /* Check that we are block aligned - btrfs_clone() requires this */ |
3037 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs)) | |
3038 | return -EINVAL; | |
3039 | ||
3040 | return 0; | |
3041 | } | |
3042 | ||
e1d227a4 | 3043 | static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, |
416161db MF |
3044 | struct inode *dst, u64 dst_loff) |
3045 | { | |
3046 | int ret; | |
e1d227a4 | 3047 | u64 len = olen; |
f4414602 | 3048 | struct cmp_pages cmp; |
0efa9f48 MF |
3049 | int same_inode = 0; |
3050 | u64 same_lock_start = 0; | |
3051 | u64 same_lock_len = 0; | |
416161db | 3052 | |
416161db | 3053 | if (src == dst) |
0efa9f48 | 3054 | same_inode = 1; |
416161db | 3055 | |
113e8283 FM |
3056 | if (len == 0) |
3057 | return 0; | |
3058 | ||
0efa9f48 | 3059 | if (same_inode) { |
5955102c | 3060 | inode_lock(src); |
416161db | 3061 | |
0efa9f48 MF |
3062 | ret = extent_same_check_offsets(src, loff, &len, olen); |
3063 | if (ret) | |
3064 | goto out_unlock; | |
416161db | 3065 | |
0efa9f48 MF |
3066 | /* |
3067 | * Single inode case wants the same checks, except we | |
3068 | * don't want our length pushed out past i_size as | |
3069 | * comparing that data range makes no sense. | |
3070 | * | |
3071 | * extent_same_check_offsets() will do this for an | |
3072 | * unaligned length at i_size, so catch it here and | |
3073 | * reject the request. | |
3074 | * | |
3075 | * This effectively means we require aligned extents | |
3076 | * for the single-inode case, whereas the other cases | |
3077 | * allow an unaligned length so long as it ends at | |
3078 | * i_size. | |
3079 | */ | |
3080 | if (len != olen) { | |
3081 | ret = -EINVAL; | |
3082 | goto out_unlock; | |
3083 | } | |
3084 | ||
3085 | /* Check for overlapping ranges */ | |
3086 | if (dst_loff + len > loff && dst_loff < loff + len) { | |
3087 | ret = -EINVAL; | |
3088 | goto out_unlock; | |
3089 | } | |
3090 | ||
3091 | same_lock_start = min_t(u64, loff, dst_loff); | |
3092 | same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start; | |
3093 | } else { | |
3094 | btrfs_double_inode_lock(src, dst); | |
3095 | ||
3096 | ret = extent_same_check_offsets(src, loff, &len, olen); | |
3097 | if (ret) | |
3098 | goto out_unlock; | |
3099 | ||
3100 | ret = extent_same_check_offsets(dst, dst_loff, &len, olen); | |
3101 | if (ret) | |
3102 | goto out_unlock; | |
3103 | } | |
416161db MF |
3104 | |
3105 | /* don't make the dst file partly checksummed */ | |
3106 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3107 | (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) { | |
3108 | ret = -EINVAL; | |
3109 | goto out_unlock; | |
3110 | } | |
3111 | ||
e0bd70c6 | 3112 | again: |
f4414602 MF |
3113 | ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp); |
3114 | if (ret) | |
3115 | goto out_unlock; | |
3116 | ||
0efa9f48 | 3117 | if (same_inode) |
e0bd70c6 FM |
3118 | ret = lock_extent_range(src, same_lock_start, same_lock_len, |
3119 | false); | |
0efa9f48 | 3120 | else |
e0bd70c6 FM |
3121 | ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len, |
3122 | false); | |
3123 | /* | |
3124 | * If one of the inodes has dirty pages in the respective range or | |
3125 | * ordered extents, we need to flush dellaloc and wait for all ordered | |
3126 | * extents in the range. We must unlock the pages and the ranges in the | |
3127 | * io trees to avoid deadlocks when flushing delalloc (requires locking | |
3128 | * pages) and when waiting for ordered extents to complete (they require | |
3129 | * range locking). | |
3130 | */ | |
3131 | if (ret == -EAGAIN) { | |
3132 | /* | |
3133 | * Ranges in the io trees already unlocked. Now unlock all | |
3134 | * pages before waiting for all IO to complete. | |
3135 | */ | |
3136 | btrfs_cmp_data_free(&cmp); | |
3137 | if (same_inode) { | |
3138 | btrfs_wait_ordered_range(src, same_lock_start, | |
3139 | same_lock_len); | |
3140 | } else { | |
3141 | btrfs_wait_ordered_range(src, loff, len); | |
3142 | btrfs_wait_ordered_range(dst, dst_loff, len); | |
3143 | } | |
3144 | goto again; | |
3145 | } | |
3146 | ASSERT(ret == 0); | |
3147 | if (WARN_ON(ret)) { | |
3148 | /* ranges in the io trees already unlocked */ | |
3149 | btrfs_cmp_data_free(&cmp); | |
3150 | return ret; | |
3151 | } | |
f4414602 | 3152 | |
207910dd | 3153 | /* pass original length for comparison so we stay within i_size */ |
f4414602 | 3154 | ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp); |
416161db | 3155 | if (ret == 0) |
1c919a5e | 3156 | ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1); |
416161db | 3157 | |
0efa9f48 MF |
3158 | if (same_inode) |
3159 | unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start, | |
3160 | same_lock_start + same_lock_len - 1); | |
3161 | else | |
3162 | btrfs_double_extent_unlock(src, loff, dst, dst_loff, len); | |
f4414602 MF |
3163 | |
3164 | btrfs_cmp_data_free(&cmp); | |
416161db | 3165 | out_unlock: |
0efa9f48 | 3166 | if (same_inode) |
5955102c | 3167 | inode_unlock(src); |
0efa9f48 MF |
3168 | else |
3169 | btrfs_double_inode_unlock(src, dst); | |
416161db MF |
3170 | |
3171 | return ret; | |
3172 | } | |
3173 | ||
ee22184b | 3174 | #define BTRFS_MAX_DEDUPE_LEN SZ_16M |
416161db | 3175 | |
2b3909f8 DW |
3176 | ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, |
3177 | struct file *dst_file, u64 dst_loff) | |
416161db | 3178 | { |
2b3909f8 DW |
3179 | struct inode *src = file_inode(src_file); |
3180 | struct inode *dst = file_inode(dst_file); | |
416161db | 3181 | u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize; |
2b3909f8 | 3182 | ssize_t res; |
416161db | 3183 | |
2b3909f8 DW |
3184 | if (olen > BTRFS_MAX_DEDUPE_LEN) |
3185 | olen = BTRFS_MAX_DEDUPE_LEN; | |
416161db MF |
3186 | |
3187 | if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) { | |
3188 | /* | |
3189 | * Btrfs does not support blocksize < page_size. As a | |
3190 | * result, btrfs_cmp_data() won't correctly handle | |
3191 | * this situation without an update. | |
3192 | */ | |
2b3909f8 | 3193 | return -EINVAL; |
416161db MF |
3194 | } |
3195 | ||
2b3909f8 DW |
3196 | res = btrfs_extent_same(src, loff, olen, dst, dst_loff); |
3197 | if (res) | |
3198 | return res; | |
3199 | return olen; | |
416161db MF |
3200 | } |
3201 | ||
f82a9901 FM |
3202 | static int clone_finish_inode_update(struct btrfs_trans_handle *trans, |
3203 | struct inode *inode, | |
3204 | u64 endoff, | |
3205 | const u64 destoff, | |
1c919a5e MF |
3206 | const u64 olen, |
3207 | int no_time_update) | |
f82a9901 FM |
3208 | { |
3209 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3210 | int ret; | |
3211 | ||
3212 | inode_inc_iversion(inode); | |
1c919a5e | 3213 | if (!no_time_update) |
04b285f3 | 3214 | inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb); |
f82a9901 FM |
3215 | /* |
3216 | * We round up to the block size at eof when determining which | |
3217 | * extents to clone above, but shouldn't round up the file size. | |
3218 | */ | |
3219 | if (endoff > destoff + olen) | |
3220 | endoff = destoff + olen; | |
3221 | if (endoff > inode->i_size) | |
3222 | btrfs_i_size_write(inode, endoff); | |
3223 | ||
3224 | ret = btrfs_update_inode(trans, root, inode); | |
3225 | if (ret) { | |
3226 | btrfs_abort_transaction(trans, root, ret); | |
3227 | btrfs_end_transaction(trans, root); | |
3228 | goto out; | |
3229 | } | |
3230 | ret = btrfs_end_transaction(trans, root); | |
3231 | out: | |
3232 | return ret; | |
3233 | } | |
3234 | ||
7ffbb598 FM |
3235 | static void clone_update_extent_map(struct inode *inode, |
3236 | const struct btrfs_trans_handle *trans, | |
3237 | const struct btrfs_path *path, | |
7ffbb598 FM |
3238 | const u64 hole_offset, |
3239 | const u64 hole_len) | |
3240 | { | |
3241 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
3242 | struct extent_map *em; | |
3243 | int ret; | |
3244 | ||
3245 | em = alloc_extent_map(); | |
3246 | if (!em) { | |
3247 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3248 | &BTRFS_I(inode)->runtime_flags); | |
3249 | return; | |
3250 | } | |
3251 | ||
14f59796 FM |
3252 | if (path) { |
3253 | struct btrfs_file_extent_item *fi; | |
3254 | ||
3255 | fi = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3256 | struct btrfs_file_extent_item); | |
7ffbb598 FM |
3257 | btrfs_extent_item_to_extent_map(inode, path, fi, false, em); |
3258 | em->generation = -1; | |
3259 | if (btrfs_file_extent_type(path->nodes[0], fi) == | |
3260 | BTRFS_FILE_EXTENT_INLINE) | |
3261 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3262 | &BTRFS_I(inode)->runtime_flags); | |
3263 | } else { | |
3264 | em->start = hole_offset; | |
3265 | em->len = hole_len; | |
3266 | em->ram_bytes = em->len; | |
3267 | em->orig_start = hole_offset; | |
3268 | em->block_start = EXTENT_MAP_HOLE; | |
3269 | em->block_len = 0; | |
3270 | em->orig_block_len = 0; | |
3271 | em->compress_type = BTRFS_COMPRESS_NONE; | |
3272 | em->generation = trans->transid; | |
3273 | } | |
3274 | ||
3275 | while (1) { | |
3276 | write_lock(&em_tree->lock); | |
3277 | ret = add_extent_mapping(em_tree, em, 1); | |
3278 | write_unlock(&em_tree->lock); | |
3279 | if (ret != -EEXIST) { | |
3280 | free_extent_map(em); | |
3281 | break; | |
3282 | } | |
3283 | btrfs_drop_extent_cache(inode, em->start, | |
3284 | em->start + em->len - 1, 0); | |
3285 | } | |
3286 | ||
ee39b432 | 3287 | if (ret) |
7ffbb598 FM |
3288 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
3289 | &BTRFS_I(inode)->runtime_flags); | |
3290 | } | |
3291 | ||
8039d87d FM |
3292 | /* |
3293 | * Make sure we do not end up inserting an inline extent into a file that has | |
3294 | * already other (non-inline) extents. If a file has an inline extent it can | |
3295 | * not have any other extents and the (single) inline extent must start at the | |
3296 | * file offset 0. Failing to respect these rules will lead to file corruption, | |
3297 | * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc | |
3298 | * | |
3299 | * We can have extents that have been already written to disk or we can have | |
3300 | * dirty ranges still in delalloc, in which case the extent maps and items are | |
3301 | * created only when we run delalloc, and the delalloc ranges might fall outside | |
3302 | * the range we are currently locking in the inode's io tree. So we check the | |
3303 | * inode's i_size because of that (i_size updates are done while holding the | |
3304 | * i_mutex, which we are holding here). | |
3305 | * We also check to see if the inode has a size not greater than "datal" but has | |
3306 | * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are | |
3307 | * protected against such concurrent fallocate calls by the i_mutex). | |
3308 | * | |
3309 | * If the file has no extents but a size greater than datal, do not allow the | |
3310 | * copy because we would need turn the inline extent into a non-inline one (even | |
3311 | * with NO_HOLES enabled). If we find our destination inode only has one inline | |
3312 | * extent, just overwrite it with the source inline extent if its size is less | |
3313 | * than the source extent's size, or we could copy the source inline extent's | |
3314 | * data into the destination inode's inline extent if the later is greater then | |
3315 | * the former. | |
3316 | */ | |
3317 | static int clone_copy_inline_extent(struct inode *src, | |
3318 | struct inode *dst, | |
3319 | struct btrfs_trans_handle *trans, | |
3320 | struct btrfs_path *path, | |
3321 | struct btrfs_key *new_key, | |
3322 | const u64 drop_start, | |
3323 | const u64 datal, | |
3324 | const u64 skip, | |
3325 | const u64 size, | |
3326 | char *inline_data) | |
3327 | { | |
3328 | struct btrfs_root *root = BTRFS_I(dst)->root; | |
3329 | const u64 aligned_end = ALIGN(new_key->offset + datal, | |
3330 | root->sectorsize); | |
3331 | int ret; | |
3332 | struct btrfs_key key; | |
3333 | ||
3334 | if (new_key->offset > 0) | |
3335 | return -EOPNOTSUPP; | |
3336 | ||
3337 | key.objectid = btrfs_ino(dst); | |
3338 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3339 | key.offset = 0; | |
3340 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
3341 | if (ret < 0) { | |
3342 | return ret; | |
3343 | } else if (ret > 0) { | |
3344 | if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { | |
3345 | ret = btrfs_next_leaf(root, path); | |
3346 | if (ret < 0) | |
3347 | return ret; | |
3348 | else if (ret > 0) | |
3349 | goto copy_inline_extent; | |
3350 | } | |
3351 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
3352 | if (key.objectid == btrfs_ino(dst) && | |
3353 | key.type == BTRFS_EXTENT_DATA_KEY) { | |
3354 | ASSERT(key.offset > 0); | |
3355 | return -EOPNOTSUPP; | |
3356 | } | |
3357 | } else if (i_size_read(dst) <= datal) { | |
3358 | struct btrfs_file_extent_item *ei; | |
3359 | u64 ext_len; | |
3360 | ||
3361 | /* | |
3362 | * If the file size is <= datal, make sure there are no other | |
3363 | * extents following (can happen do to an fallocate call with | |
3364 | * the flag FALLOC_FL_KEEP_SIZE). | |
3365 | */ | |
3366 | ei = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3367 | struct btrfs_file_extent_item); | |
3368 | /* | |
3369 | * If it's an inline extent, it can not have other extents | |
3370 | * following it. | |
3371 | */ | |
3372 | if (btrfs_file_extent_type(path->nodes[0], ei) == | |
3373 | BTRFS_FILE_EXTENT_INLINE) | |
3374 | goto copy_inline_extent; | |
3375 | ||
3376 | ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei); | |
3377 | if (ext_len > aligned_end) | |
3378 | return -EOPNOTSUPP; | |
3379 | ||
3380 | ret = btrfs_next_item(root, path); | |
3381 | if (ret < 0) { | |
3382 | return ret; | |
3383 | } else if (ret == 0) { | |
3384 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3385 | path->slots[0]); | |
3386 | if (key.objectid == btrfs_ino(dst) && | |
3387 | key.type == BTRFS_EXTENT_DATA_KEY) | |
3388 | return -EOPNOTSUPP; | |
3389 | } | |
3390 | } | |
3391 | ||
3392 | copy_inline_extent: | |
3393 | /* | |
3394 | * We have no extent items, or we have an extent at offset 0 which may | |
3395 | * or may not be inlined. All these cases are dealt the same way. | |
3396 | */ | |
3397 | if (i_size_read(dst) > datal) { | |
3398 | /* | |
3399 | * If the destination inode has an inline extent... | |
3400 | * This would require copying the data from the source inline | |
3401 | * extent into the beginning of the destination's inline extent. | |
3402 | * But this is really complex, both extents can be compressed | |
3403 | * or just one of them, which would require decompressing and | |
3404 | * re-compressing data (which could increase the new compressed | |
3405 | * size, not allowing the compressed data to fit anymore in an | |
3406 | * inline extent). | |
3407 | * So just don't support this case for now (it should be rare, | |
3408 | * we are not really saving space when cloning inline extents). | |
3409 | */ | |
3410 | return -EOPNOTSUPP; | |
3411 | } | |
3412 | ||
3413 | btrfs_release_path(path); | |
3414 | ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1); | |
3415 | if (ret) | |
3416 | return ret; | |
3417 | ret = btrfs_insert_empty_item(trans, root, path, new_key, size); | |
3418 | if (ret) | |
3419 | return ret; | |
3420 | ||
3421 | if (skip) { | |
3422 | const u32 start = btrfs_file_extent_calc_inline_size(0); | |
3423 | ||
3424 | memmove(inline_data + start, inline_data + start + skip, datal); | |
3425 | } | |
3426 | ||
3427 | write_extent_buffer(path->nodes[0], inline_data, | |
3428 | btrfs_item_ptr_offset(path->nodes[0], | |
3429 | path->slots[0]), | |
3430 | size); | |
3431 | inode_add_bytes(dst, datal); | |
3432 | ||
3433 | return 0; | |
3434 | } | |
3435 | ||
32b7c687 MF |
3436 | /** |
3437 | * btrfs_clone() - clone a range from inode file to another | |
3438 | * | |
3439 | * @src: Inode to clone from | |
3440 | * @inode: Inode to clone to | |
3441 | * @off: Offset within source to start clone from | |
3442 | * @olen: Original length, passed by user, of range to clone | |
1c919a5e | 3443 | * @olen_aligned: Block-aligned value of olen |
32b7c687 | 3444 | * @destoff: Offset within @inode to start clone |
1c919a5e | 3445 | * @no_time_update: Whether to update mtime/ctime on the target inode |
32b7c687 MF |
3446 | */ |
3447 | static int btrfs_clone(struct inode *src, struct inode *inode, | |
f82a9901 | 3448 | const u64 off, const u64 olen, const u64 olen_aligned, |
1c919a5e | 3449 | const u64 destoff, int no_time_update) |
f46b5a66 | 3450 | { |
f46b5a66 | 3451 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 | 3452 | struct btrfs_path *path = NULL; |
f46b5a66 | 3453 | struct extent_buffer *leaf; |
32b7c687 MF |
3454 | struct btrfs_trans_handle *trans; |
3455 | char *buf = NULL; | |
ae01a0ab | 3456 | struct btrfs_key key; |
f46b5a66 CH |
3457 | u32 nritems; |
3458 | int slot; | |
ae01a0ab | 3459 | int ret; |
f82a9901 | 3460 | const u64 len = olen_aligned; |
f82a9901 | 3461 | u64 last_dest_end = destoff; |
ae01a0ab YZ |
3462 | |
3463 | ret = -ENOMEM; | |
707e8a07 | 3464 | buf = vmalloc(root->nodesize); |
ae01a0ab | 3465 | if (!buf) |
32b7c687 | 3466 | return ret; |
ae01a0ab YZ |
3467 | |
3468 | path = btrfs_alloc_path(); | |
3469 | if (!path) { | |
3470 | vfree(buf); | |
32b7c687 | 3471 | return ret; |
d525e8ab LZ |
3472 | } |
3473 | ||
e4058b54 | 3474 | path->reada = READA_FORWARD; |
c5c9cd4d | 3475 | /* clone data */ |
33345d01 | 3476 | key.objectid = btrfs_ino(src); |
ae01a0ab | 3477 | key.type = BTRFS_EXTENT_DATA_KEY; |
2c463823 | 3478 | key.offset = off; |
f46b5a66 CH |
3479 | |
3480 | while (1) { | |
de249e66 | 3481 | u64 next_key_min_offset = key.offset + 1; |
df858e76 | 3482 | |
f46b5a66 CH |
3483 | /* |
3484 | * note the key will change type as we walk through the | |
3485 | * tree. | |
3486 | */ | |
e4355f34 | 3487 | path->leave_spinning = 1; |
362a20c5 DS |
3488 | ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, |
3489 | 0, 0); | |
f46b5a66 CH |
3490 | if (ret < 0) |
3491 | goto out; | |
2c463823 FM |
3492 | /* |
3493 | * First search, if no extent item that starts at offset off was | |
3494 | * found but the previous item is an extent item, it's possible | |
3495 | * it might overlap our target range, therefore process it. | |
3496 | */ | |
3497 | if (key.offset == off && ret > 0 && path->slots[0] > 0) { | |
3498 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
3499 | path->slots[0] - 1); | |
3500 | if (key.type == BTRFS_EXTENT_DATA_KEY) | |
3501 | path->slots[0]--; | |
3502 | } | |
f46b5a66 | 3503 | |
ae01a0ab | 3504 | nritems = btrfs_header_nritems(path->nodes[0]); |
e4355f34 | 3505 | process_slot: |
ae01a0ab | 3506 | if (path->slots[0] >= nritems) { |
362a20c5 | 3507 | ret = btrfs_next_leaf(BTRFS_I(src)->root, path); |
f46b5a66 CH |
3508 | if (ret < 0) |
3509 | goto out; | |
3510 | if (ret > 0) | |
3511 | break; | |
ae01a0ab | 3512 | nritems = btrfs_header_nritems(path->nodes[0]); |
f46b5a66 CH |
3513 | } |
3514 | leaf = path->nodes[0]; | |
3515 | slot = path->slots[0]; | |
f46b5a66 | 3516 | |
ae01a0ab | 3517 | btrfs_item_key_to_cpu(leaf, &key, slot); |
962a298f | 3518 | if (key.type > BTRFS_EXTENT_DATA_KEY || |
33345d01 | 3519 | key.objectid != btrfs_ino(src)) |
f46b5a66 CH |
3520 | break; |
3521 | ||
962a298f | 3522 | if (key.type == BTRFS_EXTENT_DATA_KEY) { |
c5c9cd4d SW |
3523 | struct btrfs_file_extent_item *extent; |
3524 | int type; | |
31840ae1 ZY |
3525 | u32 size; |
3526 | struct btrfs_key new_key; | |
c5c9cd4d SW |
3527 | u64 disko = 0, diskl = 0; |
3528 | u64 datao = 0, datal = 0; | |
3529 | u8 comp; | |
f82a9901 | 3530 | u64 drop_start; |
31840ae1 | 3531 | |
c5c9cd4d SW |
3532 | extent = btrfs_item_ptr(leaf, slot, |
3533 | struct btrfs_file_extent_item); | |
3534 | comp = btrfs_file_extent_compression(leaf, extent); | |
3535 | type = btrfs_file_extent_type(leaf, extent); | |
c8a894d7 CM |
3536 | if (type == BTRFS_FILE_EXTENT_REG || |
3537 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d397712b CM |
3538 | disko = btrfs_file_extent_disk_bytenr(leaf, |
3539 | extent); | |
3540 | diskl = btrfs_file_extent_disk_num_bytes(leaf, | |
3541 | extent); | |
c5c9cd4d | 3542 | datao = btrfs_file_extent_offset(leaf, extent); |
d397712b CM |
3543 | datal = btrfs_file_extent_num_bytes(leaf, |
3544 | extent); | |
c5c9cd4d SW |
3545 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3546 | /* take upper bound, may be compressed */ | |
3547 | datal = btrfs_file_extent_ram_bytes(leaf, | |
3548 | extent); | |
3549 | } | |
31840ae1 | 3550 | |
2c463823 FM |
3551 | /* |
3552 | * The first search might have left us at an extent | |
3553 | * item that ends before our target range's start, can | |
3554 | * happen if we have holes and NO_HOLES feature enabled. | |
3555 | */ | |
3556 | if (key.offset + datal <= off) { | |
e4355f34 FDBM |
3557 | path->slots[0]++; |
3558 | goto process_slot; | |
2c463823 FM |
3559 | } else if (key.offset >= off + len) { |
3560 | break; | |
e4355f34 | 3561 | } |
df858e76 | 3562 | next_key_min_offset = key.offset + datal; |
e4355f34 FDBM |
3563 | size = btrfs_item_size_nr(leaf, slot); |
3564 | read_extent_buffer(leaf, buf, | |
3565 | btrfs_item_ptr_offset(leaf, slot), | |
3566 | size); | |
3567 | ||
3568 | btrfs_release_path(path); | |
3569 | path->leave_spinning = 0; | |
c5c9cd4d | 3570 | |
31840ae1 | 3571 | memcpy(&new_key, &key, sizeof(new_key)); |
33345d01 | 3572 | new_key.objectid = btrfs_ino(inode); |
4d728ec7 LZ |
3573 | if (off <= key.offset) |
3574 | new_key.offset = key.offset + destoff - off; | |
3575 | else | |
3576 | new_key.offset = destoff; | |
31840ae1 | 3577 | |
f82a9901 FM |
3578 | /* |
3579 | * Deal with a hole that doesn't have an extent item | |
3580 | * that represents it (NO_HOLES feature enabled). | |
3581 | * This hole is either in the middle of the cloning | |
3582 | * range or at the beginning (fully overlaps it or | |
3583 | * partially overlaps it). | |
3584 | */ | |
3585 | if (new_key.offset != last_dest_end) | |
3586 | drop_start = last_dest_end; | |
3587 | else | |
3588 | drop_start = new_key.offset; | |
3589 | ||
b6f3409b SW |
3590 | /* |
3591 | * 1 - adjusting old extent (we may have to split it) | |
3592 | * 1 - add new extent | |
3593 | * 1 - inode update | |
3594 | */ | |
3595 | trans = btrfs_start_transaction(root, 3); | |
a22285a6 YZ |
3596 | if (IS_ERR(trans)) { |
3597 | ret = PTR_ERR(trans); | |
3598 | goto out; | |
3599 | } | |
3600 | ||
c8a894d7 CM |
3601 | if (type == BTRFS_FILE_EXTENT_REG || |
3602 | type == BTRFS_FILE_EXTENT_PREALLOC) { | |
d72c0842 LZ |
3603 | /* |
3604 | * a | --- range to clone ---| b | |
3605 | * | ------------- extent ------------- | | |
3606 | */ | |
3607 | ||
93915584 | 3608 | /* subtract range b */ |
d72c0842 LZ |
3609 | if (key.offset + datal > off + len) |
3610 | datal = off + len - key.offset; | |
3611 | ||
93915584 | 3612 | /* subtract range a */ |
a22285a6 YZ |
3613 | if (off > key.offset) { |
3614 | datao += off - key.offset; | |
3615 | datal -= off - key.offset; | |
3616 | } | |
3617 | ||
5dc562c5 | 3618 | ret = btrfs_drop_extents(trans, root, inode, |
f82a9901 | 3619 | drop_start, |
a22285a6 | 3620 | new_key.offset + datal, |
2671485d | 3621 | 1); |
79787eaa | 3622 | if (ret) { |
3f9e3df8 | 3623 | if (ret != -EOPNOTSUPP) |
00fdf13a LB |
3624 | btrfs_abort_transaction(trans, |
3625 | root, ret); | |
79787eaa JM |
3626 | btrfs_end_transaction(trans, root); |
3627 | goto out; | |
3628 | } | |
a22285a6 | 3629 | |
c5c9cd4d SW |
3630 | ret = btrfs_insert_empty_item(trans, root, path, |
3631 | &new_key, size); | |
79787eaa JM |
3632 | if (ret) { |
3633 | btrfs_abort_transaction(trans, root, | |
3634 | ret); | |
3635 | btrfs_end_transaction(trans, root); | |
3636 | goto out; | |
3637 | } | |
c5c9cd4d SW |
3638 | |
3639 | leaf = path->nodes[0]; | |
3640 | slot = path->slots[0]; | |
3641 | write_extent_buffer(leaf, buf, | |
31840ae1 ZY |
3642 | btrfs_item_ptr_offset(leaf, slot), |
3643 | size); | |
ae01a0ab | 3644 | |
c5c9cd4d | 3645 | extent = btrfs_item_ptr(leaf, slot, |
f46b5a66 | 3646 | struct btrfs_file_extent_item); |
c5c9cd4d | 3647 | |
c5c9cd4d SW |
3648 | /* disko == 0 means it's a hole */ |
3649 | if (!disko) | |
3650 | datao = 0; | |
c5c9cd4d SW |
3651 | |
3652 | btrfs_set_file_extent_offset(leaf, extent, | |
3653 | datao); | |
3654 | btrfs_set_file_extent_num_bytes(leaf, extent, | |
3655 | datal); | |
fcebe456 | 3656 | |
c5c9cd4d SW |
3657 | if (disko) { |
3658 | inode_add_bytes(inode, datal); | |
ae01a0ab | 3659 | ret = btrfs_inc_extent_ref(trans, root, |
5d4f98a2 YZ |
3660 | disko, diskl, 0, |
3661 | root->root_key.objectid, | |
33345d01 | 3662 | btrfs_ino(inode), |
b06c4bf5 | 3663 | new_key.offset - datao); |
79787eaa JM |
3664 | if (ret) { |
3665 | btrfs_abort_transaction(trans, | |
3666 | root, | |
3667 | ret); | |
3668 | btrfs_end_transaction(trans, | |
3669 | root); | |
3670 | goto out; | |
3671 | ||
3672 | } | |
f46b5a66 | 3673 | } |
c5c9cd4d SW |
3674 | } else if (type == BTRFS_FILE_EXTENT_INLINE) { |
3675 | u64 skip = 0; | |
3676 | u64 trim = 0; | |
ed958762 | 3677 | |
c5c9cd4d SW |
3678 | if (off > key.offset) { |
3679 | skip = off - key.offset; | |
3680 | new_key.offset += skip; | |
3681 | } | |
d397712b | 3682 | |
aa42ffd9 LB |
3683 | if (key.offset + datal > off + len) |
3684 | trim = key.offset + datal - (off + len); | |
d397712b | 3685 | |
c5c9cd4d | 3686 | if (comp && (skip || trim)) { |
c5c9cd4d | 3687 | ret = -EINVAL; |
a22285a6 | 3688 | btrfs_end_transaction(trans, root); |
c5c9cd4d SW |
3689 | goto out; |
3690 | } | |
3691 | size -= skip + trim; | |
3692 | datal -= skip + trim; | |
a22285a6 | 3693 | |
8039d87d FM |
3694 | ret = clone_copy_inline_extent(src, inode, |
3695 | trans, path, | |
3696 | &new_key, | |
3697 | drop_start, | |
3698 | datal, | |
3699 | skip, size, buf); | |
79787eaa | 3700 | if (ret) { |
3f9e3df8 | 3701 | if (ret != -EOPNOTSUPP) |
3a29bc09 | 3702 | btrfs_abort_transaction(trans, |
8039d87d FM |
3703 | root, |
3704 | ret); | |
79787eaa JM |
3705 | btrfs_end_transaction(trans, root); |
3706 | goto out; | |
3707 | } | |
c5c9cd4d SW |
3708 | leaf = path->nodes[0]; |
3709 | slot = path->slots[0]; | |
f46b5a66 | 3710 | } |
c5c9cd4d | 3711 | |
7ffbb598 FM |
3712 | /* If we have an implicit hole (NO_HOLES feature). */ |
3713 | if (drop_start < new_key.offset) | |
3714 | clone_update_extent_map(inode, trans, | |
14f59796 | 3715 | NULL, drop_start, |
7ffbb598 FM |
3716 | new_key.offset - drop_start); |
3717 | ||
14f59796 | 3718 | clone_update_extent_map(inode, trans, path, 0, 0); |
7ffbb598 | 3719 | |
c5c9cd4d | 3720 | btrfs_mark_buffer_dirty(leaf); |
b3b4aa74 | 3721 | btrfs_release_path(path); |
c5c9cd4d | 3722 | |
62e2390e FM |
3723 | last_dest_end = ALIGN(new_key.offset + datal, |
3724 | root->sectorsize); | |
f82a9901 FM |
3725 | ret = clone_finish_inode_update(trans, inode, |
3726 | last_dest_end, | |
1c919a5e MF |
3727 | destoff, olen, |
3728 | no_time_update); | |
f82a9901 | 3729 | if (ret) |
79787eaa | 3730 | goto out; |
2c463823 FM |
3731 | if (new_key.offset + datal >= destoff + len) |
3732 | break; | |
a22285a6 | 3733 | } |
b3b4aa74 | 3734 | btrfs_release_path(path); |
df858e76 | 3735 | key.offset = next_key_min_offset; |
f46b5a66 | 3736 | } |
f46b5a66 | 3737 | ret = 0; |
32b7c687 | 3738 | |
f82a9901 FM |
3739 | if (last_dest_end < destoff + len) { |
3740 | /* | |
3741 | * We have an implicit hole (NO_HOLES feature is enabled) that | |
3742 | * fully or partially overlaps our cloning range at its end. | |
3743 | */ | |
3744 | btrfs_release_path(path); | |
3745 | ||
3746 | /* | |
3747 | * 1 - remove extent(s) | |
3748 | * 1 - inode update | |
3749 | */ | |
3750 | trans = btrfs_start_transaction(root, 2); | |
3751 | if (IS_ERR(trans)) { | |
3752 | ret = PTR_ERR(trans); | |
3753 | goto out; | |
3754 | } | |
3755 | ret = btrfs_drop_extents(trans, root, inode, | |
3756 | last_dest_end, destoff + len, 1); | |
3757 | if (ret) { | |
3758 | if (ret != -EOPNOTSUPP) | |
3759 | btrfs_abort_transaction(trans, root, ret); | |
3760 | btrfs_end_transaction(trans, root); | |
3761 | goto out; | |
3762 | } | |
14f59796 FM |
3763 | clone_update_extent_map(inode, trans, NULL, last_dest_end, |
3764 | destoff + len - last_dest_end); | |
f82a9901 | 3765 | ret = clone_finish_inode_update(trans, inode, destoff + len, |
1c919a5e | 3766 | destoff, olen, no_time_update); |
f82a9901 FM |
3767 | } |
3768 | ||
f46b5a66 | 3769 | out: |
32b7c687 MF |
3770 | btrfs_free_path(path); |
3771 | vfree(buf); | |
3772 | return ret; | |
3773 | } | |
3774 | ||
3db11b2e ZB |
3775 | static noinline int btrfs_clone_files(struct file *file, struct file *file_src, |
3776 | u64 off, u64 olen, u64 destoff) | |
32b7c687 | 3777 | { |
54563d41 | 3778 | struct inode *inode = file_inode(file); |
3db11b2e | 3779 | struct inode *src = file_inode(file_src); |
32b7c687 | 3780 | struct btrfs_root *root = BTRFS_I(inode)->root; |
32b7c687 MF |
3781 | int ret; |
3782 | u64 len = olen; | |
3783 | u64 bs = root->fs_info->sb->s_blocksize; | |
3db11b2e | 3784 | int same_inode = src == inode; |
32b7c687 MF |
3785 | |
3786 | /* | |
3787 | * TODO: | |
3788 | * - split compressed inline extents. annoying: we need to | |
3789 | * decompress into destination's address_space (the file offset | |
3790 | * may change, so source mapping won't do), then recompress (or | |
3791 | * otherwise reinsert) a subrange. | |
00fdf13a LB |
3792 | * |
3793 | * - split destination inode's inline extents. The inline extents can | |
3794 | * be either compressed or non-compressed. | |
32b7c687 MF |
3795 | */ |
3796 | ||
32b7c687 MF |
3797 | if (btrfs_root_readonly(root)) |
3798 | return -EROFS; | |
3799 | ||
3db11b2e ZB |
3800 | if (file_src->f_path.mnt != file->f_path.mnt || |
3801 | src->i_sb != inode->i_sb) | |
3802 | return -EXDEV; | |
32b7c687 MF |
3803 | |
3804 | /* don't make the dst file partly checksummed */ | |
3805 | if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != | |
3806 | (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) | |
3db11b2e | 3807 | return -EINVAL; |
32b7c687 | 3808 | |
32b7c687 | 3809 | if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) |
3db11b2e | 3810 | return -EISDIR; |
32b7c687 MF |
3811 | |
3812 | if (!same_inode) { | |
293a8489 | 3813 | btrfs_double_inode_lock(src, inode); |
32b7c687 | 3814 | } else { |
5955102c | 3815 | inode_lock(src); |
32b7c687 MF |
3816 | } |
3817 | ||
3818 | /* determine range to clone */ | |
3819 | ret = -EINVAL; | |
3820 | if (off + len > src->i_size || off + len < off) | |
3821 | goto out_unlock; | |
3822 | if (len == 0) | |
3823 | olen = len = src->i_size - off; | |
3824 | /* if we extend to eof, continue to block boundary */ | |
3825 | if (off + len == src->i_size) | |
3826 | len = ALIGN(src->i_size, bs) - off; | |
3827 | ||
ccccf3d6 FM |
3828 | if (len == 0) { |
3829 | ret = 0; | |
3830 | goto out_unlock; | |
3831 | } | |
3832 | ||
32b7c687 MF |
3833 | /* verify the end result is block aligned */ |
3834 | if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || | |
3835 | !IS_ALIGNED(destoff, bs)) | |
3836 | goto out_unlock; | |
3837 | ||
3838 | /* verify if ranges are overlapped within the same file */ | |
3839 | if (same_inode) { | |
3840 | if (destoff + len > off && destoff < off + len) | |
3841 | goto out_unlock; | |
3842 | } | |
3843 | ||
3844 | if (destoff > inode->i_size) { | |
3845 | ret = btrfs_cont_expand(inode, inode->i_size, destoff); | |
3846 | if (ret) | |
3847 | goto out_unlock; | |
3848 | } | |
3849 | ||
c125b8bf FM |
3850 | /* |
3851 | * Lock the target range too. Right after we replace the file extent | |
3852 | * items in the fs tree (which now point to the cloned data), we might | |
3853 | * have a worker replace them with extent items relative to a write | |
3854 | * operation that was issued before this clone operation (i.e. confront | |
3855 | * with inode.c:btrfs_finish_ordered_io). | |
3856 | */ | |
3857 | if (same_inode) { | |
3858 | u64 lock_start = min_t(u64, off, destoff); | |
3859 | u64 lock_len = max_t(u64, off, destoff) + len - lock_start; | |
32b7c687 | 3860 | |
e0bd70c6 | 3861 | ret = lock_extent_range(src, lock_start, lock_len, true); |
c125b8bf | 3862 | } else { |
e0bd70c6 FM |
3863 | ret = btrfs_double_extent_lock(src, off, inode, destoff, len, |
3864 | true); | |
3865 | } | |
3866 | ASSERT(ret == 0); | |
3867 | if (WARN_ON(ret)) { | |
3868 | /* ranges in the io trees already unlocked */ | |
3869 | goto out_unlock; | |
c125b8bf | 3870 | } |
32b7c687 | 3871 | |
1c919a5e | 3872 | ret = btrfs_clone(src, inode, off, olen, len, destoff, 0); |
32b7c687 | 3873 | |
c125b8bf FM |
3874 | if (same_inode) { |
3875 | u64 lock_start = min_t(u64, off, destoff); | |
3876 | u64 lock_end = max_t(u64, off, destoff) + len - 1; | |
3877 | ||
3878 | unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end); | |
3879 | } else { | |
293a8489 | 3880 | btrfs_double_extent_unlock(src, off, inode, destoff, len); |
c125b8bf FM |
3881 | } |
3882 | /* | |
3883 | * Truncate page cache pages so that future reads will see the cloned | |
3884 | * data immediately and not the previous data. | |
3885 | */ | |
65bfa658 CR |
3886 | truncate_inode_pages_range(&inode->i_data, |
3887 | round_down(destoff, PAGE_CACHE_SIZE), | |
3888 | round_up(destoff + len, PAGE_CACHE_SIZE) - 1); | |
f46b5a66 | 3889 | out_unlock: |
293a8489 MF |
3890 | if (!same_inode) |
3891 | btrfs_double_inode_unlock(src, inode); | |
3892 | else | |
5955102c | 3893 | inode_unlock(src); |
3db11b2e ZB |
3894 | return ret; |
3895 | } | |
3896 | ||
3897 | ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, | |
3898 | struct file *file_out, loff_t pos_out, | |
3899 | size_t len, unsigned int flags) | |
3900 | { | |
3901 | ssize_t ret; | |
3902 | ||
3903 | ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out); | |
3904 | if (ret == 0) | |
3905 | ret = len; | |
3906 | return ret; | |
3907 | } | |
3908 | ||
04b38d60 CH |
3909 | int btrfs_clone_file_range(struct file *src_file, loff_t off, |
3910 | struct file *dst_file, loff_t destoff, u64 len) | |
3db11b2e | 3911 | { |
04b38d60 | 3912 | return btrfs_clone_files(dst_file, src_file, off, len, destoff); |
c5c9cd4d SW |
3913 | } |
3914 | ||
f46b5a66 CH |
3915 | /* |
3916 | * there are many ways the trans_start and trans_end ioctls can lead | |
3917 | * to deadlocks. They should only be used by applications that | |
3918 | * basically own the machine, and have a very in depth understanding | |
3919 | * of all the possible deadlocks and enospc problems. | |
3920 | */ | |
b2950863 | 3921 | static long btrfs_ioctl_trans_start(struct file *file) |
f46b5a66 | 3922 | { |
496ad9aa | 3923 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
3924 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3925 | struct btrfs_trans_handle *trans; | |
1ab86aed | 3926 | int ret; |
f46b5a66 | 3927 | |
1ab86aed | 3928 | ret = -EPERM; |
df5b5520 | 3929 | if (!capable(CAP_SYS_ADMIN)) |
1ab86aed | 3930 | goto out; |
df5b5520 | 3931 | |
1ab86aed SW |
3932 | ret = -EINPROGRESS; |
3933 | if (file->private_data) | |
f46b5a66 | 3934 | goto out; |
9ca9ee09 | 3935 | |
b83cc969 LZ |
3936 | ret = -EROFS; |
3937 | if (btrfs_root_readonly(root)) | |
3938 | goto out; | |
3939 | ||
a561be71 | 3940 | ret = mnt_want_write_file(file); |
c146afad YZ |
3941 | if (ret) |
3942 | goto out; | |
3943 | ||
a4abeea4 | 3944 | atomic_inc(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 3945 | |
1ab86aed | 3946 | ret = -ENOMEM; |
7a7eaa40 | 3947 | trans = btrfs_start_ioctl_transaction(root); |
abd30bb0 | 3948 | if (IS_ERR(trans)) |
1ab86aed SW |
3949 | goto out_drop; |
3950 | ||
3951 | file->private_data = trans; | |
3952 | return 0; | |
3953 | ||
3954 | out_drop: | |
a4abeea4 | 3955 | atomic_dec(&root->fs_info->open_ioctl_trans); |
2a79f17e | 3956 | mnt_drop_write_file(file); |
f46b5a66 | 3957 | out: |
f46b5a66 CH |
3958 | return ret; |
3959 | } | |
3960 | ||
6ef5ed0d JB |
3961 | static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) |
3962 | { | |
496ad9aa | 3963 | struct inode *inode = file_inode(file); |
6ef5ed0d JB |
3964 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3965 | struct btrfs_root *new_root; | |
3966 | struct btrfs_dir_item *di; | |
3967 | struct btrfs_trans_handle *trans; | |
3968 | struct btrfs_path *path; | |
3969 | struct btrfs_key location; | |
3970 | struct btrfs_disk_key disk_key; | |
6ef5ed0d JB |
3971 | u64 objectid = 0; |
3972 | u64 dir_id; | |
3c04ce01 | 3973 | int ret; |
6ef5ed0d JB |
3974 | |
3975 | if (!capable(CAP_SYS_ADMIN)) | |
3976 | return -EPERM; | |
3977 | ||
3c04ce01 MX |
3978 | ret = mnt_want_write_file(file); |
3979 | if (ret) | |
3980 | return ret; | |
3981 | ||
3982 | if (copy_from_user(&objectid, argp, sizeof(objectid))) { | |
3983 | ret = -EFAULT; | |
3984 | goto out; | |
3985 | } | |
6ef5ed0d JB |
3986 | |
3987 | if (!objectid) | |
1cecf579 | 3988 | objectid = BTRFS_FS_TREE_OBJECTID; |
6ef5ed0d JB |
3989 | |
3990 | location.objectid = objectid; | |
3991 | location.type = BTRFS_ROOT_ITEM_KEY; | |
3992 | location.offset = (u64)-1; | |
3993 | ||
3994 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
3c04ce01 MX |
3995 | if (IS_ERR(new_root)) { |
3996 | ret = PTR_ERR(new_root); | |
3997 | goto out; | |
3998 | } | |
6ef5ed0d | 3999 | |
6ef5ed0d | 4000 | path = btrfs_alloc_path(); |
3c04ce01 MX |
4001 | if (!path) { |
4002 | ret = -ENOMEM; | |
4003 | goto out; | |
4004 | } | |
6ef5ed0d JB |
4005 | path->leave_spinning = 1; |
4006 | ||
4007 | trans = btrfs_start_transaction(root, 1); | |
98d5dc13 | 4008 | if (IS_ERR(trans)) { |
6ef5ed0d | 4009 | btrfs_free_path(path); |
3c04ce01 MX |
4010 | ret = PTR_ERR(trans); |
4011 | goto out; | |
6ef5ed0d JB |
4012 | } |
4013 | ||
6c41761f | 4014 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
6ef5ed0d JB |
4015 | di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, |
4016 | dir_id, "default", 7, 1); | |
cf1e99a4 | 4017 | if (IS_ERR_OR_NULL(di)) { |
6ef5ed0d JB |
4018 | btrfs_free_path(path); |
4019 | btrfs_end_transaction(trans, root); | |
efe120a0 FH |
4020 | btrfs_err(new_root->fs_info, "Umm, you don't have the default dir" |
4021 | "item, this isn't going to work"); | |
3c04ce01 MX |
4022 | ret = -ENOENT; |
4023 | goto out; | |
6ef5ed0d JB |
4024 | } |
4025 | ||
4026 | btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); | |
4027 | btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); | |
4028 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
4029 | btrfs_free_path(path); | |
4030 | ||
2b0ce2c2 | 4031 | btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); |
6ef5ed0d | 4032 | btrfs_end_transaction(trans, root); |
3c04ce01 MX |
4033 | out: |
4034 | mnt_drop_write_file(file); | |
4035 | return ret; | |
6ef5ed0d JB |
4036 | } |
4037 | ||
5af3e8cc SB |
4038 | void btrfs_get_block_group_info(struct list_head *groups_list, |
4039 | struct btrfs_ioctl_space_info *space) | |
bf5fc093 JB |
4040 | { |
4041 | struct btrfs_block_group_cache *block_group; | |
4042 | ||
4043 | space->total_bytes = 0; | |
4044 | space->used_bytes = 0; | |
4045 | space->flags = 0; | |
4046 | list_for_each_entry(block_group, groups_list, list) { | |
4047 | space->flags = block_group->flags; | |
4048 | space->total_bytes += block_group->key.offset; | |
4049 | space->used_bytes += | |
4050 | btrfs_block_group_used(&block_group->item); | |
4051 | } | |
4052 | } | |
4053 | ||
48a3b636 | 4054 | static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) |
1406e432 JB |
4055 | { |
4056 | struct btrfs_ioctl_space_args space_args; | |
4057 | struct btrfs_ioctl_space_info space; | |
4058 | struct btrfs_ioctl_space_info *dest; | |
7fde62bf | 4059 | struct btrfs_ioctl_space_info *dest_orig; |
13f2696f | 4060 | struct btrfs_ioctl_space_info __user *user_dest; |
1406e432 | 4061 | struct btrfs_space_info *info; |
bf5fc093 JB |
4062 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, |
4063 | BTRFS_BLOCK_GROUP_SYSTEM, | |
4064 | BTRFS_BLOCK_GROUP_METADATA, | |
4065 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
4066 | int num_types = 4; | |
7fde62bf | 4067 | int alloc_size; |
1406e432 | 4068 | int ret = 0; |
51788b1b | 4069 | u64 slot_count = 0; |
bf5fc093 | 4070 | int i, c; |
1406e432 JB |
4071 | |
4072 | if (copy_from_user(&space_args, | |
4073 | (struct btrfs_ioctl_space_args __user *)arg, | |
4074 | sizeof(space_args))) | |
4075 | return -EFAULT; | |
4076 | ||
bf5fc093 JB |
4077 | for (i = 0; i < num_types; i++) { |
4078 | struct btrfs_space_info *tmp; | |
4079 | ||
4080 | info = NULL; | |
4081 | rcu_read_lock(); | |
4082 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
4083 | list) { | |
4084 | if (tmp->flags == types[i]) { | |
4085 | info = tmp; | |
4086 | break; | |
4087 | } | |
4088 | } | |
4089 | rcu_read_unlock(); | |
4090 | ||
4091 | if (!info) | |
4092 | continue; | |
4093 | ||
4094 | down_read(&info->groups_sem); | |
4095 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
4096 | if (!list_empty(&info->block_groups[c])) | |
4097 | slot_count++; | |
4098 | } | |
4099 | up_read(&info->groups_sem); | |
4100 | } | |
7fde62bf | 4101 | |
36523e95 DS |
4102 | /* |
4103 | * Global block reserve, exported as a space_info | |
4104 | */ | |
4105 | slot_count++; | |
4106 | ||
7fde62bf CM |
4107 | /* space_slots == 0 means they are asking for a count */ |
4108 | if (space_args.space_slots == 0) { | |
4109 | space_args.total_spaces = slot_count; | |
4110 | goto out; | |
4111 | } | |
bf5fc093 | 4112 | |
51788b1b | 4113 | slot_count = min_t(u64, space_args.space_slots, slot_count); |
bf5fc093 | 4114 | |
7fde62bf | 4115 | alloc_size = sizeof(*dest) * slot_count; |
bf5fc093 | 4116 | |
7fde62bf CM |
4117 | /* we generally have at most 6 or so space infos, one for each raid |
4118 | * level. So, a whole page should be more than enough for everyone | |
4119 | */ | |
4120 | if (alloc_size > PAGE_CACHE_SIZE) | |
4121 | return -ENOMEM; | |
4122 | ||
1406e432 | 4123 | space_args.total_spaces = 0; |
8d2db785 | 4124 | dest = kmalloc(alloc_size, GFP_KERNEL); |
7fde62bf CM |
4125 | if (!dest) |
4126 | return -ENOMEM; | |
4127 | dest_orig = dest; | |
1406e432 | 4128 | |
7fde62bf | 4129 | /* now we have a buffer to copy into */ |
bf5fc093 JB |
4130 | for (i = 0; i < num_types; i++) { |
4131 | struct btrfs_space_info *tmp; | |
4132 | ||
51788b1b DR |
4133 | if (!slot_count) |
4134 | break; | |
4135 | ||
bf5fc093 JB |
4136 | info = NULL; |
4137 | rcu_read_lock(); | |
4138 | list_for_each_entry_rcu(tmp, &root->fs_info->space_info, | |
4139 | list) { | |
4140 | if (tmp->flags == types[i]) { | |
4141 | info = tmp; | |
4142 | break; | |
4143 | } | |
4144 | } | |
4145 | rcu_read_unlock(); | |
7fde62bf | 4146 | |
bf5fc093 JB |
4147 | if (!info) |
4148 | continue; | |
4149 | down_read(&info->groups_sem); | |
4150 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
4151 | if (!list_empty(&info->block_groups[c])) { | |
5af3e8cc SB |
4152 | btrfs_get_block_group_info( |
4153 | &info->block_groups[c], &space); | |
bf5fc093 JB |
4154 | memcpy(dest, &space, sizeof(space)); |
4155 | dest++; | |
4156 | space_args.total_spaces++; | |
51788b1b | 4157 | slot_count--; |
bf5fc093 | 4158 | } |
51788b1b DR |
4159 | if (!slot_count) |
4160 | break; | |
bf5fc093 JB |
4161 | } |
4162 | up_read(&info->groups_sem); | |
1406e432 | 4163 | } |
1406e432 | 4164 | |
36523e95 DS |
4165 | /* |
4166 | * Add global block reserve | |
4167 | */ | |
4168 | if (slot_count) { | |
4169 | struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv; | |
4170 | ||
4171 | spin_lock(&block_rsv->lock); | |
4172 | space.total_bytes = block_rsv->size; | |
4173 | space.used_bytes = block_rsv->size - block_rsv->reserved; | |
4174 | spin_unlock(&block_rsv->lock); | |
4175 | space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV; | |
4176 | memcpy(dest, &space, sizeof(space)); | |
4177 | space_args.total_spaces++; | |
4178 | } | |
4179 | ||
2eec6c81 | 4180 | user_dest = (struct btrfs_ioctl_space_info __user *) |
7fde62bf CM |
4181 | (arg + sizeof(struct btrfs_ioctl_space_args)); |
4182 | ||
4183 | if (copy_to_user(user_dest, dest_orig, alloc_size)) | |
4184 | ret = -EFAULT; | |
4185 | ||
4186 | kfree(dest_orig); | |
4187 | out: | |
4188 | if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) | |
1406e432 JB |
4189 | ret = -EFAULT; |
4190 | ||
4191 | return ret; | |
4192 | } | |
4193 | ||
f46b5a66 CH |
4194 | /* |
4195 | * there are many ways the trans_start and trans_end ioctls can lead | |
4196 | * to deadlocks. They should only be used by applications that | |
4197 | * basically own the machine, and have a very in depth understanding | |
4198 | * of all the possible deadlocks and enospc problems. | |
4199 | */ | |
4200 | long btrfs_ioctl_trans_end(struct file *file) | |
4201 | { | |
496ad9aa | 4202 | struct inode *inode = file_inode(file); |
f46b5a66 CH |
4203 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4204 | struct btrfs_trans_handle *trans; | |
f46b5a66 | 4205 | |
f46b5a66 | 4206 | trans = file->private_data; |
1ab86aed SW |
4207 | if (!trans) |
4208 | return -EINVAL; | |
b214107e | 4209 | file->private_data = NULL; |
9ca9ee09 | 4210 | |
1ab86aed SW |
4211 | btrfs_end_transaction(trans, root); |
4212 | ||
a4abeea4 | 4213 | atomic_dec(&root->fs_info->open_ioctl_trans); |
9ca9ee09 | 4214 | |
2a79f17e | 4215 | mnt_drop_write_file(file); |
1ab86aed | 4216 | return 0; |
f46b5a66 CH |
4217 | } |
4218 | ||
9a8c28be MX |
4219 | static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, |
4220 | void __user *argp) | |
46204592 | 4221 | { |
46204592 SW |
4222 | struct btrfs_trans_handle *trans; |
4223 | u64 transid; | |
db5b493a | 4224 | int ret; |
46204592 | 4225 | |
d4edf39b | 4226 | trans = btrfs_attach_transaction_barrier(root); |
ff7c1d33 MX |
4227 | if (IS_ERR(trans)) { |
4228 | if (PTR_ERR(trans) != -ENOENT) | |
4229 | return PTR_ERR(trans); | |
4230 | ||
4231 | /* No running transaction, don't bother */ | |
4232 | transid = root->fs_info->last_trans_committed; | |
4233 | goto out; | |
4234 | } | |
46204592 | 4235 | transid = trans->transid; |
db5b493a | 4236 | ret = btrfs_commit_transaction_async(trans, root, 0); |
8b2b2d3c TI |
4237 | if (ret) { |
4238 | btrfs_end_transaction(trans, root); | |
db5b493a | 4239 | return ret; |
8b2b2d3c | 4240 | } |
ff7c1d33 | 4241 | out: |
46204592 SW |
4242 | if (argp) |
4243 | if (copy_to_user(argp, &transid, sizeof(transid))) | |
4244 | return -EFAULT; | |
4245 | return 0; | |
4246 | } | |
4247 | ||
9a8c28be MX |
4248 | static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, |
4249 | void __user *argp) | |
46204592 | 4250 | { |
46204592 SW |
4251 | u64 transid; |
4252 | ||
4253 | if (argp) { | |
4254 | if (copy_from_user(&transid, argp, sizeof(transid))) | |
4255 | return -EFAULT; | |
4256 | } else { | |
4257 | transid = 0; /* current trans */ | |
4258 | } | |
4259 | return btrfs_wait_for_commit(root, transid); | |
4260 | } | |
4261 | ||
b8e95489 | 4262 | static long btrfs_ioctl_scrub(struct file *file, void __user *arg) |
475f6387 | 4263 | { |
496ad9aa | 4264 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
475f6387 | 4265 | struct btrfs_ioctl_scrub_args *sa; |
b8e95489 | 4266 | int ret; |
475f6387 JS |
4267 | |
4268 | if (!capable(CAP_SYS_ADMIN)) | |
4269 | return -EPERM; | |
4270 | ||
4271 | sa = memdup_user(arg, sizeof(*sa)); | |
4272 | if (IS_ERR(sa)) | |
4273 | return PTR_ERR(sa); | |
4274 | ||
b8e95489 MX |
4275 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) { |
4276 | ret = mnt_want_write_file(file); | |
4277 | if (ret) | |
4278 | goto out; | |
4279 | } | |
4280 | ||
aa1b8cd4 | 4281 | ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, |
63a212ab SB |
4282 | &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, |
4283 | 0); | |
475f6387 JS |
4284 | |
4285 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4286 | ret = -EFAULT; | |
4287 | ||
b8e95489 MX |
4288 | if (!(sa->flags & BTRFS_SCRUB_READONLY)) |
4289 | mnt_drop_write_file(file); | |
4290 | out: | |
475f6387 JS |
4291 | kfree(sa); |
4292 | return ret; | |
4293 | } | |
4294 | ||
4295 | static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) | |
4296 | { | |
4297 | if (!capable(CAP_SYS_ADMIN)) | |
4298 | return -EPERM; | |
4299 | ||
aa1b8cd4 | 4300 | return btrfs_scrub_cancel(root->fs_info); |
475f6387 JS |
4301 | } |
4302 | ||
4303 | static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, | |
4304 | void __user *arg) | |
4305 | { | |
4306 | struct btrfs_ioctl_scrub_args *sa; | |
4307 | int ret; | |
4308 | ||
4309 | if (!capable(CAP_SYS_ADMIN)) | |
4310 | return -EPERM; | |
4311 | ||
4312 | sa = memdup_user(arg, sizeof(*sa)); | |
4313 | if (IS_ERR(sa)) | |
4314 | return PTR_ERR(sa); | |
4315 | ||
4316 | ret = btrfs_scrub_progress(root, sa->devid, &sa->progress); | |
4317 | ||
4318 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4319 | ret = -EFAULT; | |
4320 | ||
4321 | kfree(sa); | |
4322 | return ret; | |
4323 | } | |
4324 | ||
c11d2c23 | 4325 | static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, |
b27f7c0c | 4326 | void __user *arg) |
c11d2c23 SB |
4327 | { |
4328 | struct btrfs_ioctl_get_dev_stats *sa; | |
4329 | int ret; | |
4330 | ||
c11d2c23 SB |
4331 | sa = memdup_user(arg, sizeof(*sa)); |
4332 | if (IS_ERR(sa)) | |
4333 | return PTR_ERR(sa); | |
4334 | ||
b27f7c0c DS |
4335 | if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) { |
4336 | kfree(sa); | |
4337 | return -EPERM; | |
4338 | } | |
4339 | ||
4340 | ret = btrfs_get_dev_stats(root, sa); | |
c11d2c23 SB |
4341 | |
4342 | if (copy_to_user(arg, sa, sizeof(*sa))) | |
4343 | ret = -EFAULT; | |
4344 | ||
4345 | kfree(sa); | |
4346 | return ret; | |
4347 | } | |
4348 | ||
3f6bcfbd SB |
4349 | static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) |
4350 | { | |
4351 | struct btrfs_ioctl_dev_replace_args *p; | |
4352 | int ret; | |
4353 | ||
4354 | if (!capable(CAP_SYS_ADMIN)) | |
4355 | return -EPERM; | |
4356 | ||
4357 | p = memdup_user(arg, sizeof(*p)); | |
4358 | if (IS_ERR(p)) | |
4359 | return PTR_ERR(p); | |
4360 | ||
4361 | switch (p->cmd) { | |
4362 | case BTRFS_IOCTL_DEV_REPLACE_CMD_START: | |
adfa97cb ID |
4363 | if (root->fs_info->sb->s_flags & MS_RDONLY) { |
4364 | ret = -EROFS; | |
4365 | goto out; | |
4366 | } | |
3f6bcfbd SB |
4367 | if (atomic_xchg( |
4368 | &root->fs_info->mutually_exclusive_operation_running, | |
4369 | 1)) { | |
e57138b3 | 4370 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
3f6bcfbd SB |
4371 | } else { |
4372 | ret = btrfs_dev_replace_start(root, p); | |
4373 | atomic_set( | |
4374 | &root->fs_info->mutually_exclusive_operation_running, | |
4375 | 0); | |
4376 | } | |
4377 | break; | |
4378 | case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: | |
4379 | btrfs_dev_replace_status(root->fs_info, p); | |
4380 | ret = 0; | |
4381 | break; | |
4382 | case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: | |
4383 | ret = btrfs_dev_replace_cancel(root->fs_info, p); | |
4384 | break; | |
4385 | default: | |
4386 | ret = -EINVAL; | |
4387 | break; | |
4388 | } | |
4389 | ||
4390 | if (copy_to_user(arg, p, sizeof(*p))) | |
4391 | ret = -EFAULT; | |
adfa97cb | 4392 | out: |
3f6bcfbd SB |
4393 | kfree(p); |
4394 | return ret; | |
4395 | } | |
4396 | ||
d7728c96 JS |
4397 | static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) |
4398 | { | |
4399 | int ret = 0; | |
4400 | int i; | |
740c3d22 | 4401 | u64 rel_ptr; |
d7728c96 | 4402 | int size; |
806468f8 | 4403 | struct btrfs_ioctl_ino_path_args *ipa = NULL; |
d7728c96 JS |
4404 | struct inode_fs_paths *ipath = NULL; |
4405 | struct btrfs_path *path; | |
4406 | ||
82b22ac8 | 4407 | if (!capable(CAP_DAC_READ_SEARCH)) |
d7728c96 JS |
4408 | return -EPERM; |
4409 | ||
4410 | path = btrfs_alloc_path(); | |
4411 | if (!path) { | |
4412 | ret = -ENOMEM; | |
4413 | goto out; | |
4414 | } | |
4415 | ||
4416 | ipa = memdup_user(arg, sizeof(*ipa)); | |
4417 | if (IS_ERR(ipa)) { | |
4418 | ret = PTR_ERR(ipa); | |
4419 | ipa = NULL; | |
4420 | goto out; | |
4421 | } | |
4422 | ||
4423 | size = min_t(u32, ipa->size, 4096); | |
4424 | ipath = init_ipath(size, root, path); | |
4425 | if (IS_ERR(ipath)) { | |
4426 | ret = PTR_ERR(ipath); | |
4427 | ipath = NULL; | |
4428 | goto out; | |
4429 | } | |
4430 | ||
4431 | ret = paths_from_inode(ipa->inum, ipath); | |
4432 | if (ret < 0) | |
4433 | goto out; | |
4434 | ||
4435 | for (i = 0; i < ipath->fspath->elem_cnt; ++i) { | |
745c4d8e JM |
4436 | rel_ptr = ipath->fspath->val[i] - |
4437 | (u64)(unsigned long)ipath->fspath->val; | |
740c3d22 | 4438 | ipath->fspath->val[i] = rel_ptr; |
d7728c96 JS |
4439 | } |
4440 | ||
745c4d8e JM |
4441 | ret = copy_to_user((void *)(unsigned long)ipa->fspath, |
4442 | (void *)(unsigned long)ipath->fspath, size); | |
d7728c96 JS |
4443 | if (ret) { |
4444 | ret = -EFAULT; | |
4445 | goto out; | |
4446 | } | |
4447 | ||
4448 | out: | |
4449 | btrfs_free_path(path); | |
4450 | free_ipath(ipath); | |
4451 | kfree(ipa); | |
4452 | ||
4453 | return ret; | |
4454 | } | |
4455 | ||
4456 | static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx) | |
4457 | { | |
4458 | struct btrfs_data_container *inodes = ctx; | |
4459 | const size_t c = 3 * sizeof(u64); | |
4460 | ||
4461 | if (inodes->bytes_left >= c) { | |
4462 | inodes->bytes_left -= c; | |
4463 | inodes->val[inodes->elem_cnt] = inum; | |
4464 | inodes->val[inodes->elem_cnt + 1] = offset; | |
4465 | inodes->val[inodes->elem_cnt + 2] = root; | |
4466 | inodes->elem_cnt += 3; | |
4467 | } else { | |
4468 | inodes->bytes_missing += c - inodes->bytes_left; | |
4469 | inodes->bytes_left = 0; | |
4470 | inodes->elem_missed += 3; | |
4471 | } | |
4472 | ||
4473 | return 0; | |
4474 | } | |
4475 | ||
4476 | static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root, | |
4477 | void __user *arg) | |
4478 | { | |
4479 | int ret = 0; | |
4480 | int size; | |
d7728c96 JS |
4481 | struct btrfs_ioctl_logical_ino_args *loi; |
4482 | struct btrfs_data_container *inodes = NULL; | |
4483 | struct btrfs_path *path = NULL; | |
d7728c96 JS |
4484 | |
4485 | if (!capable(CAP_SYS_ADMIN)) | |
4486 | return -EPERM; | |
4487 | ||
4488 | loi = memdup_user(arg, sizeof(*loi)); | |
4489 | if (IS_ERR(loi)) { | |
4490 | ret = PTR_ERR(loi); | |
4491 | loi = NULL; | |
4492 | goto out; | |
4493 | } | |
4494 | ||
4495 | path = btrfs_alloc_path(); | |
4496 | if (!path) { | |
4497 | ret = -ENOMEM; | |
4498 | goto out; | |
4499 | } | |
4500 | ||
ee22184b | 4501 | size = min_t(u32, loi->size, SZ_64K); |
d7728c96 JS |
4502 | inodes = init_data_container(size); |
4503 | if (IS_ERR(inodes)) { | |
4504 | ret = PTR_ERR(inodes); | |
4505 | inodes = NULL; | |
4506 | goto out; | |
4507 | } | |
4508 | ||
df031f07 LB |
4509 | ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path, |
4510 | build_ino_list, inodes); | |
4511 | if (ret == -EINVAL) | |
d7728c96 JS |
4512 | ret = -ENOENT; |
4513 | if (ret < 0) | |
4514 | goto out; | |
4515 | ||
745c4d8e JM |
4516 | ret = copy_to_user((void *)(unsigned long)loi->inodes, |
4517 | (void *)(unsigned long)inodes, size); | |
d7728c96 JS |
4518 | if (ret) |
4519 | ret = -EFAULT; | |
4520 | ||
4521 | out: | |
4522 | btrfs_free_path(path); | |
425d17a2 | 4523 | vfree(inodes); |
d7728c96 JS |
4524 | kfree(loi); |
4525 | ||
4526 | return ret; | |
4527 | } | |
4528 | ||
19a39dce | 4529 | void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, |
c9e9f97b ID |
4530 | struct btrfs_ioctl_balance_args *bargs) |
4531 | { | |
4532 | struct btrfs_balance_control *bctl = fs_info->balance_ctl; | |
4533 | ||
4534 | bargs->flags = bctl->flags; | |
4535 | ||
837d5b6e ID |
4536 | if (atomic_read(&fs_info->balance_running)) |
4537 | bargs->state |= BTRFS_BALANCE_STATE_RUNNING; | |
4538 | if (atomic_read(&fs_info->balance_pause_req)) | |
4539 | bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ; | |
a7e99c69 ID |
4540 | if (atomic_read(&fs_info->balance_cancel_req)) |
4541 | bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ; | |
837d5b6e | 4542 | |
c9e9f97b ID |
4543 | memcpy(&bargs->data, &bctl->data, sizeof(bargs->data)); |
4544 | memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta)); | |
4545 | memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys)); | |
19a39dce ID |
4546 | |
4547 | if (lock) { | |
4548 | spin_lock(&fs_info->balance_lock); | |
4549 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4550 | spin_unlock(&fs_info->balance_lock); | |
4551 | } else { | |
4552 | memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat)); | |
4553 | } | |
c9e9f97b ID |
4554 | } |
4555 | ||
9ba1f6e4 | 4556 | static long btrfs_ioctl_balance(struct file *file, void __user *arg) |
c9e9f97b | 4557 | { |
496ad9aa | 4558 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
c9e9f97b ID |
4559 | struct btrfs_fs_info *fs_info = root->fs_info; |
4560 | struct btrfs_ioctl_balance_args *bargs; | |
4561 | struct btrfs_balance_control *bctl; | |
ed0fb78f | 4562 | bool need_unlock; /* for mut. excl. ops lock */ |
c9e9f97b ID |
4563 | int ret; |
4564 | ||
4565 | if (!capable(CAP_SYS_ADMIN)) | |
4566 | return -EPERM; | |
4567 | ||
e54bfa31 | 4568 | ret = mnt_want_write_file(file); |
9ba1f6e4 LB |
4569 | if (ret) |
4570 | return ret; | |
4571 | ||
ed0fb78f ID |
4572 | again: |
4573 | if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) { | |
4574 | mutex_lock(&fs_info->volume_mutex); | |
4575 | mutex_lock(&fs_info->balance_mutex); | |
4576 | need_unlock = true; | |
4577 | goto locked; | |
4578 | } | |
4579 | ||
4580 | /* | |
4581 | * mut. excl. ops lock is locked. Three possibilites: | |
4582 | * (1) some other op is running | |
4583 | * (2) balance is running | |
4584 | * (3) balance is paused -- special case (think resume) | |
4585 | */ | |
c9e9f97b | 4586 | mutex_lock(&fs_info->balance_mutex); |
ed0fb78f ID |
4587 | if (fs_info->balance_ctl) { |
4588 | /* this is either (2) or (3) */ | |
4589 | if (!atomic_read(&fs_info->balance_running)) { | |
4590 | mutex_unlock(&fs_info->balance_mutex); | |
4591 | if (!mutex_trylock(&fs_info->volume_mutex)) | |
4592 | goto again; | |
4593 | mutex_lock(&fs_info->balance_mutex); | |
4594 | ||
4595 | if (fs_info->balance_ctl && | |
4596 | !atomic_read(&fs_info->balance_running)) { | |
4597 | /* this is (3) */ | |
4598 | need_unlock = false; | |
4599 | goto locked; | |
4600 | } | |
4601 | ||
4602 | mutex_unlock(&fs_info->balance_mutex); | |
4603 | mutex_unlock(&fs_info->volume_mutex); | |
4604 | goto again; | |
4605 | } else { | |
4606 | /* this is (2) */ | |
4607 | mutex_unlock(&fs_info->balance_mutex); | |
4608 | ret = -EINPROGRESS; | |
4609 | goto out; | |
4610 | } | |
4611 | } else { | |
4612 | /* this is (1) */ | |
4613 | mutex_unlock(&fs_info->balance_mutex); | |
e57138b3 | 4614 | ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS; |
ed0fb78f ID |
4615 | goto out; |
4616 | } | |
4617 | ||
4618 | locked: | |
4619 | BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running)); | |
c9e9f97b ID |
4620 | |
4621 | if (arg) { | |
4622 | bargs = memdup_user(arg, sizeof(*bargs)); | |
4623 | if (IS_ERR(bargs)) { | |
4624 | ret = PTR_ERR(bargs); | |
ed0fb78f | 4625 | goto out_unlock; |
c9e9f97b | 4626 | } |
de322263 ID |
4627 | |
4628 | if (bargs->flags & BTRFS_BALANCE_RESUME) { | |
4629 | if (!fs_info->balance_ctl) { | |
4630 | ret = -ENOTCONN; | |
4631 | goto out_bargs; | |
4632 | } | |
4633 | ||
4634 | bctl = fs_info->balance_ctl; | |
4635 | spin_lock(&fs_info->balance_lock); | |
4636 | bctl->flags |= BTRFS_BALANCE_RESUME; | |
4637 | spin_unlock(&fs_info->balance_lock); | |
4638 | ||
4639 | goto do_balance; | |
4640 | } | |
c9e9f97b ID |
4641 | } else { |
4642 | bargs = NULL; | |
4643 | } | |
4644 | ||
ed0fb78f | 4645 | if (fs_info->balance_ctl) { |
837d5b6e ID |
4646 | ret = -EINPROGRESS; |
4647 | goto out_bargs; | |
4648 | } | |
4649 | ||
8d2db785 | 4650 | bctl = kzalloc(sizeof(*bctl), GFP_KERNEL); |
c9e9f97b ID |
4651 | if (!bctl) { |
4652 | ret = -ENOMEM; | |
4653 | goto out_bargs; | |
4654 | } | |
4655 | ||
4656 | bctl->fs_info = fs_info; | |
4657 | if (arg) { | |
4658 | memcpy(&bctl->data, &bargs->data, sizeof(bctl->data)); | |
4659 | memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta)); | |
4660 | memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys)); | |
4661 | ||
4662 | bctl->flags = bargs->flags; | |
f43ffb60 ID |
4663 | } else { |
4664 | /* balance everything - no filters */ | |
4665 | bctl->flags |= BTRFS_BALANCE_TYPE_MASK; | |
c9e9f97b ID |
4666 | } |
4667 | ||
8eb93459 DS |
4668 | if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) { |
4669 | ret = -EINVAL; | |
0f89abf5 | 4670 | goto out_bctl; |
8eb93459 DS |
4671 | } |
4672 | ||
de322263 | 4673 | do_balance: |
c9e9f97b | 4674 | /* |
ed0fb78f ID |
4675 | * Ownership of bctl and mutually_exclusive_operation_running |
4676 | * goes to to btrfs_balance. bctl is freed in __cancel_balance, | |
4677 | * or, if restriper was paused all the way until unmount, in | |
4678 | * free_fs_info. mutually_exclusive_operation_running is | |
4679 | * cleared in __cancel_balance. | |
c9e9f97b | 4680 | */ |
ed0fb78f ID |
4681 | need_unlock = false; |
4682 | ||
4683 | ret = btrfs_balance(bctl, bargs); | |
0f89abf5 | 4684 | bctl = NULL; |
ed0fb78f | 4685 | |
c9e9f97b ID |
4686 | if (arg) { |
4687 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4688 | ret = -EFAULT; | |
4689 | } | |
4690 | ||
0f89abf5 CE |
4691 | out_bctl: |
4692 | kfree(bctl); | |
c9e9f97b ID |
4693 | out_bargs: |
4694 | kfree(bargs); | |
ed0fb78f | 4695 | out_unlock: |
c9e9f97b ID |
4696 | mutex_unlock(&fs_info->balance_mutex); |
4697 | mutex_unlock(&fs_info->volume_mutex); | |
ed0fb78f ID |
4698 | if (need_unlock) |
4699 | atomic_set(&fs_info->mutually_exclusive_operation_running, 0); | |
4700 | out: | |
e54bfa31 | 4701 | mnt_drop_write_file(file); |
c9e9f97b ID |
4702 | return ret; |
4703 | } | |
4704 | ||
837d5b6e ID |
4705 | static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd) |
4706 | { | |
4707 | if (!capable(CAP_SYS_ADMIN)) | |
4708 | return -EPERM; | |
4709 | ||
4710 | switch (cmd) { | |
4711 | case BTRFS_BALANCE_CTL_PAUSE: | |
4712 | return btrfs_pause_balance(root->fs_info); | |
a7e99c69 ID |
4713 | case BTRFS_BALANCE_CTL_CANCEL: |
4714 | return btrfs_cancel_balance(root->fs_info); | |
837d5b6e ID |
4715 | } |
4716 | ||
4717 | return -EINVAL; | |
4718 | } | |
4719 | ||
19a39dce ID |
4720 | static long btrfs_ioctl_balance_progress(struct btrfs_root *root, |
4721 | void __user *arg) | |
4722 | { | |
4723 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4724 | struct btrfs_ioctl_balance_args *bargs; | |
4725 | int ret = 0; | |
4726 | ||
4727 | if (!capable(CAP_SYS_ADMIN)) | |
4728 | return -EPERM; | |
4729 | ||
4730 | mutex_lock(&fs_info->balance_mutex); | |
4731 | if (!fs_info->balance_ctl) { | |
4732 | ret = -ENOTCONN; | |
4733 | goto out; | |
4734 | } | |
4735 | ||
8d2db785 | 4736 | bargs = kzalloc(sizeof(*bargs), GFP_KERNEL); |
19a39dce ID |
4737 | if (!bargs) { |
4738 | ret = -ENOMEM; | |
4739 | goto out; | |
4740 | } | |
4741 | ||
4742 | update_ioctl_balance_args(fs_info, 1, bargs); | |
4743 | ||
4744 | if (copy_to_user(arg, bargs, sizeof(*bargs))) | |
4745 | ret = -EFAULT; | |
4746 | ||
4747 | kfree(bargs); | |
4748 | out: | |
4749 | mutex_unlock(&fs_info->balance_mutex); | |
4750 | return ret; | |
4751 | } | |
4752 | ||
905b0dda | 4753 | static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) |
5d13a37b | 4754 | { |
496ad9aa | 4755 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4756 | struct btrfs_ioctl_quota_ctl_args *sa; |
4757 | struct btrfs_trans_handle *trans = NULL; | |
4758 | int ret; | |
4759 | int err; | |
4760 | ||
4761 | if (!capable(CAP_SYS_ADMIN)) | |
4762 | return -EPERM; | |
4763 | ||
905b0dda MX |
4764 | ret = mnt_want_write_file(file); |
4765 | if (ret) | |
4766 | return ret; | |
5d13a37b AJ |
4767 | |
4768 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4769 | if (IS_ERR(sa)) { |
4770 | ret = PTR_ERR(sa); | |
4771 | goto drop_write; | |
4772 | } | |
5d13a37b | 4773 | |
7708f029 | 4774 | down_write(&root->fs_info->subvol_sem); |
2f232036 JS |
4775 | trans = btrfs_start_transaction(root->fs_info->tree_root, 2); |
4776 | if (IS_ERR(trans)) { | |
4777 | ret = PTR_ERR(trans); | |
4778 | goto out; | |
5d13a37b AJ |
4779 | } |
4780 | ||
4781 | switch (sa->cmd) { | |
4782 | case BTRFS_QUOTA_CTL_ENABLE: | |
4783 | ret = btrfs_quota_enable(trans, root->fs_info); | |
4784 | break; | |
4785 | case BTRFS_QUOTA_CTL_DISABLE: | |
4786 | ret = btrfs_quota_disable(trans, root->fs_info); | |
4787 | break; | |
5d13a37b AJ |
4788 | default: |
4789 | ret = -EINVAL; | |
4790 | break; | |
4791 | } | |
4792 | ||
2f232036 JS |
4793 | err = btrfs_commit_transaction(trans, root->fs_info->tree_root); |
4794 | if (err && !ret) | |
4795 | ret = err; | |
5d13a37b AJ |
4796 | out: |
4797 | kfree(sa); | |
7708f029 | 4798 | up_write(&root->fs_info->subvol_sem); |
905b0dda MX |
4799 | drop_write: |
4800 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4801 | return ret; |
4802 | } | |
4803 | ||
905b0dda | 4804 | static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) |
5d13a37b | 4805 | { |
496ad9aa | 4806 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4807 | struct btrfs_ioctl_qgroup_assign_args *sa; |
4808 | struct btrfs_trans_handle *trans; | |
4809 | int ret; | |
4810 | int err; | |
4811 | ||
4812 | if (!capable(CAP_SYS_ADMIN)) | |
4813 | return -EPERM; | |
4814 | ||
905b0dda MX |
4815 | ret = mnt_want_write_file(file); |
4816 | if (ret) | |
4817 | return ret; | |
5d13a37b AJ |
4818 | |
4819 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4820 | if (IS_ERR(sa)) { |
4821 | ret = PTR_ERR(sa); | |
4822 | goto drop_write; | |
4823 | } | |
5d13a37b AJ |
4824 | |
4825 | trans = btrfs_join_transaction(root); | |
4826 | if (IS_ERR(trans)) { | |
4827 | ret = PTR_ERR(trans); | |
4828 | goto out; | |
4829 | } | |
4830 | ||
4831 | /* FIXME: check if the IDs really exist */ | |
4832 | if (sa->assign) { | |
4833 | ret = btrfs_add_qgroup_relation(trans, root->fs_info, | |
4834 | sa->src, sa->dst); | |
4835 | } else { | |
4836 | ret = btrfs_del_qgroup_relation(trans, root->fs_info, | |
4837 | sa->src, sa->dst); | |
4838 | } | |
4839 | ||
e082f563 QW |
4840 | /* update qgroup status and info */ |
4841 | err = btrfs_run_qgroups(trans, root->fs_info); | |
4842 | if (err < 0) | |
a4553fef | 4843 | btrfs_std_error(root->fs_info, ret, |
e082f563 | 4844 | "failed to update qgroup status and info\n"); |
5d13a37b AJ |
4845 | err = btrfs_end_transaction(trans, root); |
4846 | if (err && !ret) | |
4847 | ret = err; | |
4848 | ||
4849 | out: | |
4850 | kfree(sa); | |
905b0dda MX |
4851 | drop_write: |
4852 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4853 | return ret; |
4854 | } | |
4855 | ||
905b0dda | 4856 | static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) |
5d13a37b | 4857 | { |
496ad9aa | 4858 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4859 | struct btrfs_ioctl_qgroup_create_args *sa; |
4860 | struct btrfs_trans_handle *trans; | |
4861 | int ret; | |
4862 | int err; | |
4863 | ||
4864 | if (!capable(CAP_SYS_ADMIN)) | |
4865 | return -EPERM; | |
4866 | ||
905b0dda MX |
4867 | ret = mnt_want_write_file(file); |
4868 | if (ret) | |
4869 | return ret; | |
5d13a37b AJ |
4870 | |
4871 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4872 | if (IS_ERR(sa)) { |
4873 | ret = PTR_ERR(sa); | |
4874 | goto drop_write; | |
4875 | } | |
5d13a37b | 4876 | |
d86e56cf MX |
4877 | if (!sa->qgroupid) { |
4878 | ret = -EINVAL; | |
4879 | goto out; | |
4880 | } | |
4881 | ||
5d13a37b AJ |
4882 | trans = btrfs_join_transaction(root); |
4883 | if (IS_ERR(trans)) { | |
4884 | ret = PTR_ERR(trans); | |
4885 | goto out; | |
4886 | } | |
4887 | ||
4888 | /* FIXME: check if the IDs really exist */ | |
4889 | if (sa->create) { | |
4087cf24 | 4890 | ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid); |
5d13a37b AJ |
4891 | } else { |
4892 | ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid); | |
4893 | } | |
4894 | ||
4895 | err = btrfs_end_transaction(trans, root); | |
4896 | if (err && !ret) | |
4897 | ret = err; | |
4898 | ||
4899 | out: | |
4900 | kfree(sa); | |
905b0dda MX |
4901 | drop_write: |
4902 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4903 | return ret; |
4904 | } | |
4905 | ||
905b0dda | 4906 | static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) |
5d13a37b | 4907 | { |
496ad9aa | 4908 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
5d13a37b AJ |
4909 | struct btrfs_ioctl_qgroup_limit_args *sa; |
4910 | struct btrfs_trans_handle *trans; | |
4911 | int ret; | |
4912 | int err; | |
4913 | u64 qgroupid; | |
4914 | ||
4915 | if (!capable(CAP_SYS_ADMIN)) | |
4916 | return -EPERM; | |
4917 | ||
905b0dda MX |
4918 | ret = mnt_want_write_file(file); |
4919 | if (ret) | |
4920 | return ret; | |
5d13a37b AJ |
4921 | |
4922 | sa = memdup_user(arg, sizeof(*sa)); | |
905b0dda MX |
4923 | if (IS_ERR(sa)) { |
4924 | ret = PTR_ERR(sa); | |
4925 | goto drop_write; | |
4926 | } | |
5d13a37b AJ |
4927 | |
4928 | trans = btrfs_join_transaction(root); | |
4929 | if (IS_ERR(trans)) { | |
4930 | ret = PTR_ERR(trans); | |
4931 | goto out; | |
4932 | } | |
4933 | ||
4934 | qgroupid = sa->qgroupid; | |
4935 | if (!qgroupid) { | |
4936 | /* take the current subvol as qgroup */ | |
4937 | qgroupid = root->root_key.objectid; | |
4938 | } | |
4939 | ||
4940 | /* FIXME: check if the IDs really exist */ | |
4941 | ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim); | |
4942 | ||
4943 | err = btrfs_end_transaction(trans, root); | |
4944 | if (err && !ret) | |
4945 | ret = err; | |
4946 | ||
4947 | out: | |
4948 | kfree(sa); | |
905b0dda MX |
4949 | drop_write: |
4950 | mnt_drop_write_file(file); | |
5d13a37b AJ |
4951 | return ret; |
4952 | } | |
4953 | ||
2f232036 JS |
4954 | static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg) |
4955 | { | |
6d0379ec | 4956 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4957 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4958 | int ret; | |
4959 | ||
4960 | if (!capable(CAP_SYS_ADMIN)) | |
4961 | return -EPERM; | |
4962 | ||
4963 | ret = mnt_want_write_file(file); | |
4964 | if (ret) | |
4965 | return ret; | |
4966 | ||
4967 | qsa = memdup_user(arg, sizeof(*qsa)); | |
4968 | if (IS_ERR(qsa)) { | |
4969 | ret = PTR_ERR(qsa); | |
4970 | goto drop_write; | |
4971 | } | |
4972 | ||
4973 | if (qsa->flags) { | |
4974 | ret = -EINVAL; | |
4975 | goto out; | |
4976 | } | |
4977 | ||
4978 | ret = btrfs_qgroup_rescan(root->fs_info); | |
4979 | ||
4980 | out: | |
4981 | kfree(qsa); | |
4982 | drop_write: | |
4983 | mnt_drop_write_file(file); | |
4984 | return ret; | |
4985 | } | |
4986 | ||
4987 | static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg) | |
4988 | { | |
6d0379ec | 4989 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
2f232036 JS |
4990 | struct btrfs_ioctl_quota_rescan_args *qsa; |
4991 | int ret = 0; | |
4992 | ||
4993 | if (!capable(CAP_SYS_ADMIN)) | |
4994 | return -EPERM; | |
4995 | ||
8d2db785 | 4996 | qsa = kzalloc(sizeof(*qsa), GFP_KERNEL); |
2f232036 JS |
4997 | if (!qsa) |
4998 | return -ENOMEM; | |
4999 | ||
5000 | if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { | |
5001 | qsa->flags = 1; | |
5002 | qsa->progress = root->fs_info->qgroup_rescan_progress.objectid; | |
5003 | } | |
5004 | ||
5005 | if (copy_to_user(arg, qsa, sizeof(*qsa))) | |
5006 | ret = -EFAULT; | |
5007 | ||
5008 | kfree(qsa); | |
5009 | return ret; | |
5010 | } | |
5011 | ||
57254b6e JS |
5012 | static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg) |
5013 | { | |
54563d41 | 5014 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
57254b6e JS |
5015 | |
5016 | if (!capable(CAP_SYS_ADMIN)) | |
5017 | return -EPERM; | |
5018 | ||
5019 | return btrfs_qgroup_wait_for_completion(root->fs_info); | |
5020 | } | |
5021 | ||
abccd00f HM |
5022 | static long _btrfs_ioctl_set_received_subvol(struct file *file, |
5023 | struct btrfs_ioctl_received_subvol_args *sa) | |
8ea05e3a | 5024 | { |
496ad9aa | 5025 | struct inode *inode = file_inode(file); |
8ea05e3a AB |
5026 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5027 | struct btrfs_root_item *root_item = &root->root_item; | |
5028 | struct btrfs_trans_handle *trans; | |
04b285f3 | 5029 | struct timespec ct = current_fs_time(inode->i_sb); |
8ea05e3a | 5030 | int ret = 0; |
dd5f9615 | 5031 | int received_uuid_changed; |
8ea05e3a | 5032 | |
bd60ea0f DS |
5033 | if (!inode_owner_or_capable(inode)) |
5034 | return -EPERM; | |
5035 | ||
8ea05e3a AB |
5036 | ret = mnt_want_write_file(file); |
5037 | if (ret < 0) | |
5038 | return ret; | |
5039 | ||
5040 | down_write(&root->fs_info->subvol_sem); | |
5041 | ||
5042 | if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) { | |
5043 | ret = -EINVAL; | |
5044 | goto out; | |
5045 | } | |
5046 | ||
5047 | if (btrfs_root_readonly(root)) { | |
5048 | ret = -EROFS; | |
5049 | goto out; | |
5050 | } | |
5051 | ||
dd5f9615 SB |
5052 | /* |
5053 | * 1 - root item | |
5054 | * 2 - uuid items (received uuid + subvol uuid) | |
5055 | */ | |
5056 | trans = btrfs_start_transaction(root, 3); | |
8ea05e3a AB |
5057 | if (IS_ERR(trans)) { |
5058 | ret = PTR_ERR(trans); | |
5059 | trans = NULL; | |
5060 | goto out; | |
5061 | } | |
5062 | ||
5063 | sa->rtransid = trans->transid; | |
5064 | sa->rtime.sec = ct.tv_sec; | |
5065 | sa->rtime.nsec = ct.tv_nsec; | |
5066 | ||
dd5f9615 SB |
5067 | received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid, |
5068 | BTRFS_UUID_SIZE); | |
5069 | if (received_uuid_changed && | |
5070 | !btrfs_is_empty_uuid(root_item->received_uuid)) | |
5071 | btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root, | |
5072 | root_item->received_uuid, | |
5073 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
5074 | root->root_key.objectid); | |
8ea05e3a AB |
5075 | memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE); |
5076 | btrfs_set_root_stransid(root_item, sa->stransid); | |
5077 | btrfs_set_root_rtransid(root_item, sa->rtransid); | |
3cae210f QW |
5078 | btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec); |
5079 | btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec); | |
5080 | btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec); | |
5081 | btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec); | |
8ea05e3a AB |
5082 | |
5083 | ret = btrfs_update_root(trans, root->fs_info->tree_root, | |
5084 | &root->root_key, &root->root_item); | |
5085 | if (ret < 0) { | |
5086 | btrfs_end_transaction(trans, root); | |
8ea05e3a | 5087 | goto out; |
dd5f9615 SB |
5088 | } |
5089 | if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) { | |
5090 | ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root, | |
5091 | sa->uuid, | |
5092 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
5093 | root->root_key.objectid); | |
5094 | if (ret < 0 && ret != -EEXIST) { | |
5095 | btrfs_abort_transaction(trans, root, ret); | |
8ea05e3a | 5096 | goto out; |
dd5f9615 SB |
5097 | } |
5098 | } | |
5099 | ret = btrfs_commit_transaction(trans, root); | |
5100 | if (ret < 0) { | |
5101 | btrfs_abort_transaction(trans, root, ret); | |
5102 | goto out; | |
8ea05e3a AB |
5103 | } |
5104 | ||
abccd00f HM |
5105 | out: |
5106 | up_write(&root->fs_info->subvol_sem); | |
5107 | mnt_drop_write_file(file); | |
5108 | return ret; | |
5109 | } | |
5110 | ||
5111 | #ifdef CONFIG_64BIT | |
5112 | static long btrfs_ioctl_set_received_subvol_32(struct file *file, | |
5113 | void __user *arg) | |
5114 | { | |
5115 | struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL; | |
5116 | struct btrfs_ioctl_received_subvol_args *args64 = NULL; | |
5117 | int ret = 0; | |
5118 | ||
5119 | args32 = memdup_user(arg, sizeof(*args32)); | |
5120 | if (IS_ERR(args32)) { | |
5121 | ret = PTR_ERR(args32); | |
5122 | args32 = NULL; | |
5123 | goto out; | |
5124 | } | |
5125 | ||
8d2db785 | 5126 | args64 = kmalloc(sizeof(*args64), GFP_KERNEL); |
84dbeb87 DC |
5127 | if (!args64) { |
5128 | ret = -ENOMEM; | |
abccd00f HM |
5129 | goto out; |
5130 | } | |
5131 | ||
5132 | memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE); | |
5133 | args64->stransid = args32->stransid; | |
5134 | args64->rtransid = args32->rtransid; | |
5135 | args64->stime.sec = args32->stime.sec; | |
5136 | args64->stime.nsec = args32->stime.nsec; | |
5137 | args64->rtime.sec = args32->rtime.sec; | |
5138 | args64->rtime.nsec = args32->rtime.nsec; | |
5139 | args64->flags = args32->flags; | |
5140 | ||
5141 | ret = _btrfs_ioctl_set_received_subvol(file, args64); | |
5142 | if (ret) | |
5143 | goto out; | |
5144 | ||
5145 | memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE); | |
5146 | args32->stransid = args64->stransid; | |
5147 | args32->rtransid = args64->rtransid; | |
5148 | args32->stime.sec = args64->stime.sec; | |
5149 | args32->stime.nsec = args64->stime.nsec; | |
5150 | args32->rtime.sec = args64->rtime.sec; | |
5151 | args32->rtime.nsec = args64->rtime.nsec; | |
5152 | args32->flags = args64->flags; | |
5153 | ||
5154 | ret = copy_to_user(arg, args32, sizeof(*args32)); | |
5155 | if (ret) | |
5156 | ret = -EFAULT; | |
5157 | ||
5158 | out: | |
5159 | kfree(args32); | |
5160 | kfree(args64); | |
5161 | return ret; | |
5162 | } | |
5163 | #endif | |
5164 | ||
5165 | static long btrfs_ioctl_set_received_subvol(struct file *file, | |
5166 | void __user *arg) | |
5167 | { | |
5168 | struct btrfs_ioctl_received_subvol_args *sa = NULL; | |
5169 | int ret = 0; | |
5170 | ||
5171 | sa = memdup_user(arg, sizeof(*sa)); | |
5172 | if (IS_ERR(sa)) { | |
5173 | ret = PTR_ERR(sa); | |
5174 | sa = NULL; | |
5175 | goto out; | |
5176 | } | |
5177 | ||
5178 | ret = _btrfs_ioctl_set_received_subvol(file, sa); | |
5179 | ||
5180 | if (ret) | |
5181 | goto out; | |
5182 | ||
8ea05e3a AB |
5183 | ret = copy_to_user(arg, sa, sizeof(*sa)); |
5184 | if (ret) | |
5185 | ret = -EFAULT; | |
5186 | ||
5187 | out: | |
5188 | kfree(sa); | |
8ea05e3a AB |
5189 | return ret; |
5190 | } | |
5191 | ||
867ab667 | 5192 | static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg) |
5193 | { | |
6d0379ec | 5194 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a1b83ac5 | 5195 | size_t len; |
867ab667 | 5196 | int ret; |
a1b83ac5 AJ |
5197 | char label[BTRFS_LABEL_SIZE]; |
5198 | ||
5199 | spin_lock(&root->fs_info->super_lock); | |
5200 | memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE); | |
5201 | spin_unlock(&root->fs_info->super_lock); | |
5202 | ||
5203 | len = strnlen(label, BTRFS_LABEL_SIZE); | |
867ab667 | 5204 | |
5205 | if (len == BTRFS_LABEL_SIZE) { | |
efe120a0 FH |
5206 | btrfs_warn(root->fs_info, |
5207 | "label is too long, return the first %zu bytes", --len); | |
867ab667 | 5208 | } |
5209 | ||
867ab667 | 5210 | ret = copy_to_user(arg, label, len); |
867ab667 | 5211 | |
5212 | return ret ? -EFAULT : 0; | |
5213 | } | |
5214 | ||
a8bfd4ab | 5215 | static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg) |
5216 | { | |
6d0379ec | 5217 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
a8bfd4ab | 5218 | struct btrfs_super_block *super_block = root->fs_info->super_copy; |
5219 | struct btrfs_trans_handle *trans; | |
5220 | char label[BTRFS_LABEL_SIZE]; | |
5221 | int ret; | |
5222 | ||
5223 | if (!capable(CAP_SYS_ADMIN)) | |
5224 | return -EPERM; | |
5225 | ||
5226 | if (copy_from_user(label, arg, sizeof(label))) | |
5227 | return -EFAULT; | |
5228 | ||
5229 | if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) { | |
efe120a0 | 5230 | btrfs_err(root->fs_info, "unable to set label with more than %d bytes", |
a8bfd4ab | 5231 | BTRFS_LABEL_SIZE - 1); |
5232 | return -EINVAL; | |
5233 | } | |
5234 | ||
5235 | ret = mnt_want_write_file(file); | |
5236 | if (ret) | |
5237 | return ret; | |
5238 | ||
a8bfd4ab | 5239 | trans = btrfs_start_transaction(root, 0); |
5240 | if (IS_ERR(trans)) { | |
5241 | ret = PTR_ERR(trans); | |
5242 | goto out_unlock; | |
5243 | } | |
5244 | ||
a1b83ac5 | 5245 | spin_lock(&root->fs_info->super_lock); |
a8bfd4ab | 5246 | strcpy(super_block->label, label); |
a1b83ac5 | 5247 | spin_unlock(&root->fs_info->super_lock); |
d0270aca | 5248 | ret = btrfs_commit_transaction(trans, root); |
a8bfd4ab | 5249 | |
5250 | out_unlock: | |
a8bfd4ab | 5251 | mnt_drop_write_file(file); |
5252 | return ret; | |
5253 | } | |
5254 | ||
2eaa055f JM |
5255 | #define INIT_FEATURE_FLAGS(suffix) \ |
5256 | { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \ | |
5257 | .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \ | |
5258 | .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix } | |
5259 | ||
d5131b65 | 5260 | int btrfs_ioctl_get_supported_features(void __user *arg) |
2eaa055f | 5261 | { |
4d4ab6d6 | 5262 | static const struct btrfs_ioctl_feature_flags features[3] = { |
2eaa055f JM |
5263 | INIT_FEATURE_FLAGS(SUPP), |
5264 | INIT_FEATURE_FLAGS(SAFE_SET), | |
5265 | INIT_FEATURE_FLAGS(SAFE_CLEAR) | |
5266 | }; | |
5267 | ||
5268 | if (copy_to_user(arg, &features, sizeof(features))) | |
5269 | return -EFAULT; | |
5270 | ||
5271 | return 0; | |
5272 | } | |
5273 | ||
5274 | static int btrfs_ioctl_get_features(struct file *file, void __user *arg) | |
5275 | { | |
5276 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
5277 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
5278 | struct btrfs_ioctl_feature_flags features; | |
5279 | ||
5280 | features.compat_flags = btrfs_super_compat_flags(super_block); | |
5281 | features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block); | |
5282 | features.incompat_flags = btrfs_super_incompat_flags(super_block); | |
5283 | ||
5284 | if (copy_to_user(arg, &features, sizeof(features))) | |
5285 | return -EFAULT; | |
5286 | ||
5287 | return 0; | |
5288 | } | |
5289 | ||
3b02a68a JM |
5290 | static int check_feature_bits(struct btrfs_root *root, |
5291 | enum btrfs_feature_set set, | |
2eaa055f JM |
5292 | u64 change_mask, u64 flags, u64 supported_flags, |
5293 | u64 safe_set, u64 safe_clear) | |
5294 | { | |
3b02a68a JM |
5295 | const char *type = btrfs_feature_set_names[set]; |
5296 | char *names; | |
2eaa055f JM |
5297 | u64 disallowed, unsupported; |
5298 | u64 set_mask = flags & change_mask; | |
5299 | u64 clear_mask = ~flags & change_mask; | |
5300 | ||
5301 | unsupported = set_mask & ~supported_flags; | |
5302 | if (unsupported) { | |
3b02a68a JM |
5303 | names = btrfs_printable_features(set, unsupported); |
5304 | if (names) { | |
5305 | btrfs_warn(root->fs_info, | |
5306 | "this kernel does not support the %s feature bit%s", | |
5307 | names, strchr(names, ',') ? "s" : ""); | |
5308 | kfree(names); | |
5309 | } else | |
5310 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5311 | "this kernel does not support %s bits 0x%llx", |
5312 | type, unsupported); | |
5313 | return -EOPNOTSUPP; | |
5314 | } | |
5315 | ||
5316 | disallowed = set_mask & ~safe_set; | |
5317 | if (disallowed) { | |
3b02a68a JM |
5318 | names = btrfs_printable_features(set, disallowed); |
5319 | if (names) { | |
5320 | btrfs_warn(root->fs_info, | |
5321 | "can't set the %s feature bit%s while mounted", | |
5322 | names, strchr(names, ',') ? "s" : ""); | |
5323 | kfree(names); | |
5324 | } else | |
5325 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5326 | "can't set %s bits 0x%llx while mounted", |
5327 | type, disallowed); | |
5328 | return -EPERM; | |
5329 | } | |
5330 | ||
5331 | disallowed = clear_mask & ~safe_clear; | |
5332 | if (disallowed) { | |
3b02a68a JM |
5333 | names = btrfs_printable_features(set, disallowed); |
5334 | if (names) { | |
5335 | btrfs_warn(root->fs_info, | |
5336 | "can't clear the %s feature bit%s while mounted", | |
5337 | names, strchr(names, ',') ? "s" : ""); | |
5338 | kfree(names); | |
5339 | } else | |
5340 | btrfs_warn(root->fs_info, | |
2eaa055f JM |
5341 | "can't clear %s bits 0x%llx while mounted", |
5342 | type, disallowed); | |
5343 | return -EPERM; | |
5344 | } | |
5345 | ||
5346 | return 0; | |
5347 | } | |
5348 | ||
5349 | #define check_feature(root, change_mask, flags, mask_base) \ | |
3b02a68a | 5350 | check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \ |
2eaa055f JM |
5351 | BTRFS_FEATURE_ ## mask_base ## _SUPP, \ |
5352 | BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \ | |
5353 | BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR) | |
5354 | ||
5355 | static int btrfs_ioctl_set_features(struct file *file, void __user *arg) | |
5356 | { | |
5357 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; | |
5358 | struct btrfs_super_block *super_block = root->fs_info->super_copy; | |
5359 | struct btrfs_ioctl_feature_flags flags[2]; | |
5360 | struct btrfs_trans_handle *trans; | |
5361 | u64 newflags; | |
5362 | int ret; | |
5363 | ||
5364 | if (!capable(CAP_SYS_ADMIN)) | |
5365 | return -EPERM; | |
5366 | ||
5367 | if (copy_from_user(flags, arg, sizeof(flags))) | |
5368 | return -EFAULT; | |
5369 | ||
5370 | /* Nothing to do */ | |
5371 | if (!flags[0].compat_flags && !flags[0].compat_ro_flags && | |
5372 | !flags[0].incompat_flags) | |
5373 | return 0; | |
5374 | ||
5375 | ret = check_feature(root, flags[0].compat_flags, | |
5376 | flags[1].compat_flags, COMPAT); | |
5377 | if (ret) | |
5378 | return ret; | |
5379 | ||
5380 | ret = check_feature(root, flags[0].compat_ro_flags, | |
5381 | flags[1].compat_ro_flags, COMPAT_RO); | |
5382 | if (ret) | |
5383 | return ret; | |
5384 | ||
5385 | ret = check_feature(root, flags[0].incompat_flags, | |
5386 | flags[1].incompat_flags, INCOMPAT); | |
5387 | if (ret) | |
5388 | return ret; | |
5389 | ||
8051aa1a | 5390 | trans = btrfs_start_transaction(root, 0); |
2eaa055f JM |
5391 | if (IS_ERR(trans)) |
5392 | return PTR_ERR(trans); | |
5393 | ||
5394 | spin_lock(&root->fs_info->super_lock); | |
5395 | newflags = btrfs_super_compat_flags(super_block); | |
5396 | newflags |= flags[0].compat_flags & flags[1].compat_flags; | |
5397 | newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags); | |
5398 | btrfs_set_super_compat_flags(super_block, newflags); | |
5399 | ||
5400 | newflags = btrfs_super_compat_ro_flags(super_block); | |
5401 | newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags; | |
5402 | newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags); | |
5403 | btrfs_set_super_compat_ro_flags(super_block, newflags); | |
5404 | ||
5405 | newflags = btrfs_super_incompat_flags(super_block); | |
5406 | newflags |= flags[0].incompat_flags & flags[1].incompat_flags; | |
5407 | newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags); | |
5408 | btrfs_set_super_incompat_flags(super_block, newflags); | |
5409 | spin_unlock(&root->fs_info->super_lock); | |
5410 | ||
d0270aca | 5411 | return btrfs_commit_transaction(trans, root); |
2eaa055f JM |
5412 | } |
5413 | ||
f46b5a66 CH |
5414 | long btrfs_ioctl(struct file *file, unsigned int |
5415 | cmd, unsigned long arg) | |
5416 | { | |
496ad9aa | 5417 | struct btrfs_root *root = BTRFS_I(file_inode(file))->root; |
4bcabaa3 | 5418 | void __user *argp = (void __user *)arg; |
f46b5a66 CH |
5419 | |
5420 | switch (cmd) { | |
6cbff00f CH |
5421 | case FS_IOC_GETFLAGS: |
5422 | return btrfs_ioctl_getflags(file, argp); | |
5423 | case FS_IOC_SETFLAGS: | |
5424 | return btrfs_ioctl_setflags(file, argp); | |
5425 | case FS_IOC_GETVERSION: | |
5426 | return btrfs_ioctl_getversion(file, argp); | |
f7039b1d LD |
5427 | case FITRIM: |
5428 | return btrfs_ioctl_fitrim(file, argp); | |
f46b5a66 | 5429 | case BTRFS_IOC_SNAP_CREATE: |
fa0d2b9b | 5430 | return btrfs_ioctl_snap_create(file, argp, 0); |
fdfb1e4f | 5431 | case BTRFS_IOC_SNAP_CREATE_V2: |
fa0d2b9b | 5432 | return btrfs_ioctl_snap_create_v2(file, argp, 0); |
3de4586c | 5433 | case BTRFS_IOC_SUBVOL_CREATE: |
fa0d2b9b | 5434 | return btrfs_ioctl_snap_create(file, argp, 1); |
6f72c7e2 AJ |
5435 | case BTRFS_IOC_SUBVOL_CREATE_V2: |
5436 | return btrfs_ioctl_snap_create_v2(file, argp, 1); | |
76dda93c YZ |
5437 | case BTRFS_IOC_SNAP_DESTROY: |
5438 | return btrfs_ioctl_snap_destroy(file, argp); | |
0caa102d LZ |
5439 | case BTRFS_IOC_SUBVOL_GETFLAGS: |
5440 | return btrfs_ioctl_subvol_getflags(file, argp); | |
5441 | case BTRFS_IOC_SUBVOL_SETFLAGS: | |
5442 | return btrfs_ioctl_subvol_setflags(file, argp); | |
6ef5ed0d JB |
5443 | case BTRFS_IOC_DEFAULT_SUBVOL: |
5444 | return btrfs_ioctl_default_subvol(file, argp); | |
f46b5a66 | 5445 | case BTRFS_IOC_DEFRAG: |
1e701a32 CM |
5446 | return btrfs_ioctl_defrag(file, NULL); |
5447 | case BTRFS_IOC_DEFRAG_RANGE: | |
5448 | return btrfs_ioctl_defrag(file, argp); | |
f46b5a66 | 5449 | case BTRFS_IOC_RESIZE: |
198605a8 | 5450 | return btrfs_ioctl_resize(file, argp); |
f46b5a66 | 5451 | case BTRFS_IOC_ADD_DEV: |
4bcabaa3 | 5452 | return btrfs_ioctl_add_dev(root, argp); |
f46b5a66 | 5453 | case BTRFS_IOC_RM_DEV: |
da24927b | 5454 | return btrfs_ioctl_rm_dev(file, argp); |
475f6387 JS |
5455 | case BTRFS_IOC_FS_INFO: |
5456 | return btrfs_ioctl_fs_info(root, argp); | |
5457 | case BTRFS_IOC_DEV_INFO: | |
5458 | return btrfs_ioctl_dev_info(root, argp); | |
f46b5a66 | 5459 | case BTRFS_IOC_BALANCE: |
9ba1f6e4 | 5460 | return btrfs_ioctl_balance(file, NULL); |
f46b5a66 CH |
5461 | case BTRFS_IOC_TRANS_START: |
5462 | return btrfs_ioctl_trans_start(file); | |
5463 | case BTRFS_IOC_TRANS_END: | |
5464 | return btrfs_ioctl_trans_end(file); | |
ac8e9819 CM |
5465 | case BTRFS_IOC_TREE_SEARCH: |
5466 | return btrfs_ioctl_tree_search(file, argp); | |
cc68a8a5 GH |
5467 | case BTRFS_IOC_TREE_SEARCH_V2: |
5468 | return btrfs_ioctl_tree_search_v2(file, argp); | |
ac8e9819 CM |
5469 | case BTRFS_IOC_INO_LOOKUP: |
5470 | return btrfs_ioctl_ino_lookup(file, argp); | |
d7728c96 JS |
5471 | case BTRFS_IOC_INO_PATHS: |
5472 | return btrfs_ioctl_ino_to_path(root, argp); | |
5473 | case BTRFS_IOC_LOGICAL_INO: | |
5474 | return btrfs_ioctl_logical_to_ino(root, argp); | |
1406e432 JB |
5475 | case BTRFS_IOC_SPACE_INFO: |
5476 | return btrfs_ioctl_space_info(root, argp); | |
9b199859 FDBM |
5477 | case BTRFS_IOC_SYNC: { |
5478 | int ret; | |
5479 | ||
6c255e67 | 5480 | ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); |
9b199859 FDBM |
5481 | if (ret) |
5482 | return ret; | |
ddb52f4f | 5483 | ret = btrfs_sync_fs(file_inode(file)->i_sb, 1); |
2fad4e83 DS |
5484 | /* |
5485 | * The transaction thread may want to do more work, | |
5486 | * namely it pokes the cleaner ktread that will start | |
5487 | * processing uncleaned subvols. | |
5488 | */ | |
5489 | wake_up_process(root->fs_info->transaction_kthread); | |
9b199859 FDBM |
5490 | return ret; |
5491 | } | |
46204592 | 5492 | case BTRFS_IOC_START_SYNC: |
9a8c28be | 5493 | return btrfs_ioctl_start_sync(root, argp); |
46204592 | 5494 | case BTRFS_IOC_WAIT_SYNC: |
9a8c28be | 5495 | return btrfs_ioctl_wait_sync(root, argp); |
475f6387 | 5496 | case BTRFS_IOC_SCRUB: |
b8e95489 | 5497 | return btrfs_ioctl_scrub(file, argp); |
475f6387 JS |
5498 | case BTRFS_IOC_SCRUB_CANCEL: |
5499 | return btrfs_ioctl_scrub_cancel(root, argp); | |
5500 | case BTRFS_IOC_SCRUB_PROGRESS: | |
5501 | return btrfs_ioctl_scrub_progress(root, argp); | |
c9e9f97b | 5502 | case BTRFS_IOC_BALANCE_V2: |
9ba1f6e4 | 5503 | return btrfs_ioctl_balance(file, argp); |
837d5b6e ID |
5504 | case BTRFS_IOC_BALANCE_CTL: |
5505 | return btrfs_ioctl_balance_ctl(root, arg); | |
19a39dce ID |
5506 | case BTRFS_IOC_BALANCE_PROGRESS: |
5507 | return btrfs_ioctl_balance_progress(root, argp); | |
8ea05e3a AB |
5508 | case BTRFS_IOC_SET_RECEIVED_SUBVOL: |
5509 | return btrfs_ioctl_set_received_subvol(file, argp); | |
abccd00f HM |
5510 | #ifdef CONFIG_64BIT |
5511 | case BTRFS_IOC_SET_RECEIVED_SUBVOL_32: | |
5512 | return btrfs_ioctl_set_received_subvol_32(file, argp); | |
5513 | #endif | |
31db9f7c AB |
5514 | case BTRFS_IOC_SEND: |
5515 | return btrfs_ioctl_send(file, argp); | |
c11d2c23 | 5516 | case BTRFS_IOC_GET_DEV_STATS: |
b27f7c0c | 5517 | return btrfs_ioctl_get_dev_stats(root, argp); |
5d13a37b | 5518 | case BTRFS_IOC_QUOTA_CTL: |
905b0dda | 5519 | return btrfs_ioctl_quota_ctl(file, argp); |
5d13a37b | 5520 | case BTRFS_IOC_QGROUP_ASSIGN: |
905b0dda | 5521 | return btrfs_ioctl_qgroup_assign(file, argp); |
5d13a37b | 5522 | case BTRFS_IOC_QGROUP_CREATE: |
905b0dda | 5523 | return btrfs_ioctl_qgroup_create(file, argp); |
5d13a37b | 5524 | case BTRFS_IOC_QGROUP_LIMIT: |
905b0dda | 5525 | return btrfs_ioctl_qgroup_limit(file, argp); |
2f232036 JS |
5526 | case BTRFS_IOC_QUOTA_RESCAN: |
5527 | return btrfs_ioctl_quota_rescan(file, argp); | |
5528 | case BTRFS_IOC_QUOTA_RESCAN_STATUS: | |
5529 | return btrfs_ioctl_quota_rescan_status(file, argp); | |
57254b6e JS |
5530 | case BTRFS_IOC_QUOTA_RESCAN_WAIT: |
5531 | return btrfs_ioctl_quota_rescan_wait(file, argp); | |
3f6bcfbd SB |
5532 | case BTRFS_IOC_DEV_REPLACE: |
5533 | return btrfs_ioctl_dev_replace(root, argp); | |
867ab667 | 5534 | case BTRFS_IOC_GET_FSLABEL: |
5535 | return btrfs_ioctl_get_fslabel(file, argp); | |
a8bfd4ab | 5536 | case BTRFS_IOC_SET_FSLABEL: |
5537 | return btrfs_ioctl_set_fslabel(file, argp); | |
2eaa055f | 5538 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
d5131b65 | 5539 | return btrfs_ioctl_get_supported_features(argp); |
2eaa055f JM |
5540 | case BTRFS_IOC_GET_FEATURES: |
5541 | return btrfs_ioctl_get_features(file, argp); | |
5542 | case BTRFS_IOC_SET_FEATURES: | |
5543 | return btrfs_ioctl_set_features(file, argp); | |
f46b5a66 CH |
5544 | } |
5545 | ||
5546 | return -ENOTTY; | |
5547 | } |