projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[linux-2.6-block.git] / fs / btrfs / ioctl.c
CommitLineData
c1d7c514 1// SPDX-License-Identifier: GPL-2.0
f46b5a66
CH		 2/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
f46b5a66
CH		 4 */
5
6#include <linux/kernel.h>
7#include <linux/bio.h>
f46b5a66
CH		 8#include <linux/file.h>
9#include <linux/fs.h>
cb8e7090 10#include <linux/fsnotify.h>
f46b5a66
CH		 11#include <linux/pagemap.h>
12#include <linux/highmem.h>
13#include <linux/time.h>
f46b5a66 14#include <linux/string.h>
f46b5a66 15#include <linux/backing-dev.h>
cb8e7090 16#include <linux/mount.h>
cb8e7090 17#include <linux/namei.h>
f46b5a66 18#include <linux/writeback.h>
f46b5a66 19#include <linux/compat.h>
cb8e7090 20#include <linux/security.h>
f46b5a66 21#include <linux/xattr.h>
f54de068 22#include <linux/mm.h>
5a0e3ad6 23#include <linux/slab.h>
f7039b1d 24#include <linux/blkdev.h>
8ea05e3a 25#include <linux/uuid.h>
55e301fd 26#include <linux/btrfs.h>
416161db 27#include <linux/uaccess.h>
ae5e165d 28#include <linux/iversion.h>
f46b5a66
CH		 29#include "ctree.h"
30#include "disk-io.h"
31#include "transaction.h"
32#include "btrfs_inode.h"
f46b5a66
CH		 33#include "print-tree.h"
34#include "volumes.h"
925baedd 35#include "locking.h"
581bb050 36#include "inode-map.h"
d7728c96 37#include "backref.h"
606686ee 38#include "rcu-string.h"
31db9f7c 39#include "send.h"
3f6bcfbd 40#include "dev-replace.h"
63541927 41#include "props.h"
3b02a68a 42#include "sysfs.h"
fcebe456 43#include "qgroup.h"
1ec9a1ae 44#include "tree-log.h"
ebb8765b 45#include "compression.h"
f46b5a66 46
abccd00f
HM		 47#ifdef CONFIG_64BIT
48/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
49 * structures are incorrect, as the timespec structure from userspace
50 * is 4 bytes too small. We define these alternatives here to teach
51 * the kernel about the 32-bit struct packing.
52 */
53struct btrfs_ioctl_timespec_32 {
54 __u64 sec;
55 __u32 nsec;
56} __attribute__ ((__packed__));
57
58struct btrfs_ioctl_received_subvol_args_32 {
59 char uuid[BTRFS_UUID_SIZE]; /* in */
60 __u64 stransid; /* in */
61 __u64 rtransid; /* out */
62 struct btrfs_ioctl_timespec_32 stime; /* in */
63 struct btrfs_ioctl_timespec_32 rtime; /* out */
64 __u64 flags; /* in */
65 __u64 reserved[16]; /* in */
66} __attribute__ ((__packed__));
67
68#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
69 struct btrfs_ioctl_received_subvol_args_32)
70#endif
71
2351f431
JB		 72#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
73struct btrfs_ioctl_send_args_32 {
74 __s64 send_fd; /* in */
75 __u64 clone_sources_count; /* in */
76 compat_uptr_t clone_sources; /* in */
77 __u64 parent_root; /* in */
78 __u64 flags; /* in */
79 __u64 reserved[4]; /* in */
80} __attribute__ ((__packed__));
81
82#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
83 struct btrfs_ioctl_send_args_32)
84#endif
abccd00f 85
416161db 86static int btrfs_clone(struct inode *src, struct inode *inode,
1c919a5e
MF		 87 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
88 int no_time_update);
416161db 89
6cbff00f 90/* Mask out flags that are inappropriate for the given type of inode. */
1905a0f7
DS		 91static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
92 unsigned int flags)
6cbff00f 93{
1905a0f7 94 if (S_ISDIR(inode->i_mode))
6cbff00f 95 return flags;
1905a0f7 96 else if (S_ISREG(inode->i_mode))
6cbff00f
CH		 97 return flags & ~FS_DIRSYNC_FL;
98 else
99 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
100}
101
102/*
a157d4fd
DS		 103 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
104 * ioctl.
6cbff00f 105 */
a157d4fd 106static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
6cbff00f
CH		 107{
108 unsigned int iflags = 0;
109
110 if (flags & BTRFS_INODE_SYNC)
111 iflags |= FS_SYNC_FL;
112 if (flags & BTRFS_INODE_IMMUTABLE)
113 iflags |= FS_IMMUTABLE_FL;
114 if (flags & BTRFS_INODE_APPEND)
115 iflags |= FS_APPEND_FL;
116 if (flags & BTRFS_INODE_NODUMP)
117 iflags |= FS_NODUMP_FL;
118 if (flags & BTRFS_INODE_NOATIME)
119 iflags |= FS_NOATIME_FL;
120 if (flags & BTRFS_INODE_DIRSYNC)
121 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 122 if (flags & BTRFS_INODE_NODATACOW)
123 iflags |= FS_NOCOW_FL;
124
13f48dc9 125 if (flags & BTRFS_INODE_NOCOMPRESS)
d0092bdd 126 iflags |= FS_NOCOMP_FL;
13f48dc9
ST		 127 else if (flags & BTRFS_INODE_COMPRESS)
128 iflags |= FS_COMPR_FL;
6cbff00f
CH		 129
130 return iflags;
131}
132
133/*
134 * Update inode->i_flags based on the btrfs internal flags.
135 */
7b6a221e 136void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
6cbff00f 137{
5c57b8b6 138 struct btrfs_inode *binode = BTRFS_I(inode);
3cc79392 139 unsigned int new_fl = 0;
6cbff00f 140
5c57b8b6 141 if (binode->flags & BTRFS_INODE_SYNC)
3cc79392 142 new_fl |= S_SYNC;
5c57b8b6 143 if (binode->flags & BTRFS_INODE_IMMUTABLE)
3cc79392 144 new_fl |= S_IMMUTABLE;
5c57b8b6 145 if (binode->flags & BTRFS_INODE_APPEND)
3cc79392 146 new_fl |= S_APPEND;
5c57b8b6 147 if (binode->flags & BTRFS_INODE_NOATIME)
3cc79392 148 new_fl |= S_NOATIME;
5c57b8b6 149 if (binode->flags & BTRFS_INODE_DIRSYNC)
3cc79392
FM		 150 new_fl |= S_DIRSYNC;
151
152 set_mask_bits(&inode->i_flags,
153 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
154 new_fl);
6cbff00f
CH		 155}
156
6cbff00f
CH		 157static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
158{
5c57b8b6
DS		 159 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
160 unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
6cbff00f
CH		 161
162 if (copy_to_user(arg, &flags, sizeof(flags)))
163 return -EFAULT;
164 return 0;
165}
166
5ba76abf
DS		 167/* Check if @flags are a supported and valid set of FS_*_FL flags */
168static int check_fsflags(unsigned int flags)
75e7cb7f
LB		 169{
170 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
171 FS_NOATIME_FL | FS_NODUMP_FL | \
172 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 173 FS_NOCOMP_FL | FS_COMPR_FL |
174 FS_NOCOW_FL))
75e7cb7f
LB		 175 return -EOPNOTSUPP;
176
177 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
178 return -EINVAL;
179
75e7cb7f
LB		 180 return 0;
181}
182
6cbff00f
CH		 183static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
184{
496ad9aa 185 struct inode *inode = file_inode(file);
0b246afa 186 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5c57b8b6
DS		 187 struct btrfs_inode *binode = BTRFS_I(inode);
188 struct btrfs_root *root = binode->root;
6cbff00f 189 struct btrfs_trans_handle *trans;
5c57b8b6 190 unsigned int fsflags, old_fsflags;
6cbff00f 191 int ret;
5c57b8b6
DS		 192 u64 old_flags;
193 unsigned int old_i_flags;
7e97b8da 194 umode_t mode;
6cbff00f 195
bd60ea0f
DS		 196 if (!inode_owner_or_capable(inode))
197 return -EPERM;
198
b83cc969
LZ		 199 if (btrfs_root_readonly(root))
200 return -EROFS;
201
5c57b8b6 202 if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
6cbff00f
CH		 203 return -EFAULT;
204
5c57b8b6 205 ret = check_fsflags(fsflags);
75e7cb7f
LB		 206 if (ret)
207 return ret;
f46b5a66 208
e7848683
JK		 209 ret = mnt_want_write_file(file);
210 if (ret)
211 return ret;
212
5955102c 213 inode_lock(inode);
6cbff00f 214
5c57b8b6
DS		 215 old_flags = binode->flags;
216 old_i_flags = inode->i_flags;
7e97b8da 217 mode = inode->i_mode;
f062abf0 218
5c57b8b6
DS		 219 fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
220 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
221 if ((fsflags ^ old_fsflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
6cbff00f
CH		 222 if (!capable(CAP_LINUX_IMMUTABLE)) {
223 ret = -EPERM;
224 goto out_unlock;
225 }
226 }
227
5c57b8b6
DS		 228 if (fsflags & FS_SYNC_FL)
229 binode->flags |= BTRFS_INODE_SYNC;
6cbff00f 230 else
5c57b8b6
DS		 231 binode->flags &= ~BTRFS_INODE_SYNC;
232 if (fsflags & FS_IMMUTABLE_FL)
233 binode->flags |= BTRFS_INODE_IMMUTABLE;
6cbff00f 234 else
5c57b8b6
DS		 235 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
236 if (fsflags & FS_APPEND_FL)
237 binode->flags |= BTRFS_INODE_APPEND;
6cbff00f 238 else
5c57b8b6
DS		 239 binode->flags &= ~BTRFS_INODE_APPEND;
240 if (fsflags & FS_NODUMP_FL)
241 binode->flags |= BTRFS_INODE_NODUMP;
6cbff00f 242 else
5c57b8b6
DS		 243 binode->flags &= ~BTRFS_INODE_NODUMP;
244 if (fsflags & FS_NOATIME_FL)
245 binode->flags |= BTRFS_INODE_NOATIME;
6cbff00f 246 else
5c57b8b6
DS		 247 binode->flags &= ~BTRFS_INODE_NOATIME;
248 if (fsflags & FS_DIRSYNC_FL)
249 binode->flags |= BTRFS_INODE_DIRSYNC;
6cbff00f 250 else
5c57b8b6
DS		 251 binode->flags &= ~BTRFS_INODE_DIRSYNC;
252 if (fsflags & FS_NOCOW_FL) {
7e97b8da
DS		 253 if (S_ISREG(mode)) {
254 /*
255 * It's safe to turn csums off here, no extents exist.
256 * Otherwise we want the flag to reflect the real COW
257 * status of the file and will not set it.
258 */
259 if (inode->i_size == 0)
5c57b8b6
DS		 260 binode->flags |= BTRFS_INODE_NODATACOW
261 | BTRFS_INODE_NODATASUM;
7e97b8da 262 } else {
5c57b8b6 263 binode->flags |= BTRFS_INODE_NODATACOW;
7e97b8da
DS		 264 }
265 } else {
266 /*
01327610 267 * Revert back under same assumptions as above
7e97b8da
DS		 268 */
269 if (S_ISREG(mode)) {
270 if (inode->i_size == 0)
5c57b8b6 271 binode->flags &= ~(BTRFS_INODE_NODATACOW
7e97b8da
DS		 272 | BTRFS_INODE_NODATASUM);
273 } else {
5c57b8b6 274 binode->flags &= ~BTRFS_INODE_NODATACOW;
7e97b8da
DS		 275 }
276 }
6cbff00f 277
75e7cb7f
LB		 278 /*
279 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
280 * flag may be changed automatically if compression code won't make
281 * things smaller.
282 */
5c57b8b6
DS		 283 if (fsflags & FS_NOCOMP_FL) {
284 binode->flags &= ~BTRFS_INODE_COMPRESS;
285 binode->flags |= BTRFS_INODE_NOCOMPRESS;
63541927
FDBM		 286
287 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
288 if (ret && ret != -ENODATA)
289 goto out_drop;
5c57b8b6 290 } else if (fsflags & FS_COMPR_FL) {
63541927
FDBM		 291 const char *comp;
292
eede2bf3
OS		 293 if (IS_SWAPFILE(inode)) {
294 ret = -ETXTBSY;
295 goto out_unlock;
296 }
297
5c57b8b6
DS		 298 binode->flags |= BTRFS_INODE_COMPRESS;
299 binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
63541927 300
93370509
DS		 301 comp = btrfs_compress_type2str(fs_info->compress_type);
302 if (!comp || comp[0] == 0)
303 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
304
63541927
FDBM		 305 ret = btrfs_set_prop(inode, "btrfs.compression",
306 comp, strlen(comp), 0);
307 if (ret)
308 goto out_drop;
309
ebcb904d 310 } else {
78a017a2
FM		 311 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
312 if (ret && ret != -ENODATA)
313 goto out_drop;
5c57b8b6 314 binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 315 }
6cbff00f 316
4da6f1a3 317 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 318 if (IS_ERR(trans)) {
319 ret = PTR_ERR(trans);
320 goto out_drop;
321 }
6cbff00f 322
7b6a221e 323 btrfs_sync_inode_flags_to_i_flags(inode);
0c4d2d95 324 inode_inc_iversion(inode);
c2050a45 325 inode->i_ctime = current_time(inode);
6cbff00f 326 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 327
3a45bb20 328 btrfs_end_transaction(trans);
f062abf0
LZ		 329 out_drop:
330 if (ret) {
5c57b8b6
DS		 331 binode->flags = old_flags;
332 inode->i_flags = old_i_flags;
f062abf0 333 }
6cbff00f 334
6cbff00f 335 out_unlock:
5955102c 336 inode_unlock(inode);
e7848683 337 mnt_drop_write_file(file);
2d4e6f6a 338 return ret;
6cbff00f
CH		 339}
340
19f93b3c
DS		 341/*
342 * Translate btrfs internal inode flags to xflags as expected by the
343 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
344 * silently dropped.
345 */
346static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
347{
348 unsigned int xflags = 0;
349
350 if (flags & BTRFS_INODE_APPEND)
351 xflags |= FS_XFLAG_APPEND;
352 if (flags & BTRFS_INODE_IMMUTABLE)
353 xflags |= FS_XFLAG_IMMUTABLE;
354 if (flags & BTRFS_INODE_NOATIME)
355 xflags |= FS_XFLAG_NOATIME;
356 if (flags & BTRFS_INODE_NODUMP)
357 xflags |= FS_XFLAG_NODUMP;
358 if (flags & BTRFS_INODE_SYNC)
359 xflags |= FS_XFLAG_SYNC;
360
361 return xflags;
362}
363
364/* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
365static int check_xflags(unsigned int flags)
366{
367 if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
368 FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
369 return -EOPNOTSUPP;
370 return 0;
371}
372
e4202ac9
DS		 373/*
374 * Set the xflags from the internal inode flags. The remaining items of fsxattr
375 * are zeroed.
376 */
377static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
378{
379 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
380 struct fsxattr fa;
381
382 memset(&fa, 0, sizeof(fa));
383 fa.fsx_xflags = btrfs_inode_flags_to_xflags(binode->flags);
384
385 if (copy_to_user(arg, &fa, sizeof(fa)))
386 return -EFAULT;
387
388 return 0;
389}
390
025f2121
DS		 391static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
392{
393 struct inode *inode = file_inode(file);
394 struct btrfs_inode *binode = BTRFS_I(inode);
395 struct btrfs_root *root = binode->root;
396 struct btrfs_trans_handle *trans;
397 struct fsxattr fa;
398 unsigned old_flags;
399 unsigned old_i_flags;
400 int ret = 0;
401
402 if (!inode_owner_or_capable(inode))
403 return -EPERM;
404
405 if (btrfs_root_readonly(root))
406 return -EROFS;
407
408 memset(&fa, 0, sizeof(fa));
409 if (copy_from_user(&fa, arg, sizeof(fa)))
410 return -EFAULT;
411
412 ret = check_xflags(fa.fsx_xflags);
413 if (ret)
414 return ret;
415
416 if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
417 return -EOPNOTSUPP;
418
419 ret = mnt_want_write_file(file);
420 if (ret)
421 return ret;
422
423 inode_lock(inode);
424
425 old_flags = binode->flags;
426 old_i_flags = inode->i_flags;
427
428 /* We need the capabilities to change append-only or immutable inode */
429 if (((old_flags & (BTRFS_INODE_APPEND | BTRFS_INODE_IMMUTABLE)) ||
430 (fa.fsx_xflags & (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE))) &&
431 !capable(CAP_LINUX_IMMUTABLE)) {
432 ret = -EPERM;
433 goto out_unlock;
434 }
435
436 if (fa.fsx_xflags & FS_XFLAG_SYNC)
437 binode->flags |= BTRFS_INODE_SYNC;
438 else
439 binode->flags &= ~BTRFS_INODE_SYNC;
440 if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
441 binode->flags |= BTRFS_INODE_IMMUTABLE;
442 else
443 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
444 if (fa.fsx_xflags & FS_XFLAG_APPEND)
445 binode->flags |= BTRFS_INODE_APPEND;
446 else
447 binode->flags &= ~BTRFS_INODE_APPEND;
448 if (fa.fsx_xflags & FS_XFLAG_NODUMP)
449 binode->flags |= BTRFS_INODE_NODUMP;
450 else
451 binode->flags &= ~BTRFS_INODE_NODUMP;
452 if (fa.fsx_xflags & FS_XFLAG_NOATIME)
453 binode->flags |= BTRFS_INODE_NOATIME;
454 else
455 binode->flags &= ~BTRFS_INODE_NOATIME;
456
457 /* 1 item for the inode */
458 trans = btrfs_start_transaction(root, 1);
459 if (IS_ERR(trans)) {
460 ret = PTR_ERR(trans);
461 goto out_unlock;
462 }
463
464 btrfs_sync_inode_flags_to_i_flags(inode);
465 inode_inc_iversion(inode);
466 inode->i_ctime = current_time(inode);
467 ret = btrfs_update_inode(trans, root, inode);
468
469 btrfs_end_transaction(trans);
470
471out_unlock:
472 if (ret) {
473 binode->flags = old_flags;
474 inode->i_flags = old_i_flags;
475 }
476
477 inode_unlock(inode);
478 mnt_drop_write_file(file);
479
480 return ret;
481}
482
6cbff00f
CH		 483static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
484{
496ad9aa 485 struct inode *inode = file_inode(file);
6cbff00f
CH		 486
487 return put_user(inode->i_generation, arg);
488}
f46b5a66 489
f7039b1d
LD		 490static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
491{
0b246afa
JM		 492 struct inode *inode = file_inode(file);
493 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f7039b1d
LD		 494 struct btrfs_device *device;
495 struct request_queue *q;
496 struct fstrim_range range;
497 u64 minlen = ULLONG_MAX;
498 u64 num_devices = 0;
499 int ret;
500
501 if (!capable(CAP_SYS_ADMIN))
502 return -EPERM;
503
f35f06c3
FM		 504 /*
505 * If the fs is mounted with nologreplay, which requires it to be
506 * mounted in RO mode as well, we can not allow discard on free space
507 * inside block groups, because log trees refer to extents that are not
508 * pinned in a block group's free space cache (pinning the extents is
509 * precisely the first phase of replaying a log tree).
510 */
511 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
512 return -EROFS;
513
1f78160c
XG		 514 rcu_read_lock();
515 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
516 dev_list) {
f7039b1d
LD		 517 if (!device->bdev)
518 continue;
519 q = bdev_get_queue(device->bdev);
520 if (blk_queue_discard(q)) {
521 num_devices++;
50d0446e 522 minlen = min_t(u64, q->limits.discard_granularity,
f7039b1d
LD		 523 minlen);
524 }
525 }
1f78160c 526 rcu_read_unlock();
f4c697e6 527
f7039b1d
LD		 528 if (!num_devices)
529 return -EOPNOTSUPP;
f7039b1d
LD		 530 if (copy_from_user(&range, arg, sizeof(range)))
531 return -EFAULT;
6ba9fc8e
QW		 532
533 /*
534 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
535 * block group is in the logical address space, which can be any
536 * sectorsize aligned bytenr in the range [0, U64_MAX].
537 */
538 if (range.len < fs_info->sb->s_blocksize)
f4c697e6 539 return -EINVAL;
f7039b1d
LD		 540
541 range.minlen = max(range.minlen, minlen);
2ff7e61e 542 ret = btrfs_trim_fs(fs_info, &range);
f7039b1d
LD		 543 if (ret < 0)
544 return ret;
545
546 if (copy_to_user(arg, &range, sizeof(range)))
547 return -EFAULT;
548
549 return 0;
550}
551
dd5f9615
SB		 552int btrfs_is_empty_uuid(u8 *uuid)
553{
46e0f66a
CM		 554 int i;
555
556 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
557 if (uuid[i])
558 return 0;
559 }
560 return 1;
dd5f9615
SB		 561}
562
d5c12070 563static noinline int create_subvol(struct inode *dir,
cb8e7090 564 struct dentry *dentry,
52f75f4f 565 const char *name, int namelen,
6f72c7e2 566 u64 *async_transid,
8696c533 567 struct btrfs_qgroup_inherit *inherit)
f46b5a66 568{
0b246afa 569 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
f46b5a66
CH		 570 struct btrfs_trans_handle *trans;
571 struct btrfs_key key;
49a3c4d9 572 struct btrfs_root_item *root_item;
f46b5a66
CH		 573 struct btrfs_inode_item *inode_item;
574 struct extent_buffer *leaf;
d5c12070 575 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 576 struct btrfs_root *new_root;
d5c12070 577 struct btrfs_block_rsv block_rsv;
95582b00 578 struct timespec64 cur_time = current_time(dir);
5662344b 579 struct inode *inode;
f46b5a66
CH		 580 int ret;
581 int err;
582 u64 objectid;
583 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 584 u64 index = 0;
8ea05e3a 585 uuid_le new_uuid;
f46b5a66 586
49a3c4d9
DS		 587 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
588 if (!root_item)
589 return -ENOMEM;
590
0b246afa 591 ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
2fbe8c8a 592 if (ret)
49a3c4d9 593 goto fail_free;
6a912213 594
e09fe2d2
QW		 595 /*
596 * Don't create subvolume whose level is not zero. Or qgroup will be
01327610 597 * screwed up since it assumes subvolume qgroup's level to be 0.
e09fe2d2 598 */
49a3c4d9
DS		 599 if (btrfs_qgroup_level(objectid)) {
600 ret = -ENOSPC;
601 goto fail_free;
602 }
e09fe2d2 603
d5c12070 604 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 605 /*
d5c12070
MX		 606 * The same as the snapshot creation, please see the comment
607 * of create_snapshot().
9ed74f2d 608 */
c4c129db 609 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
d5c12070 610 if (ret)
49a3c4d9 611 goto fail_free;
d5c12070
MX		 612
613 trans = btrfs_start_transaction(root, 0);
614 if (IS_ERR(trans)) {
615 ret = PTR_ERR(trans);
7775c818 616 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
49a3c4d9 617 goto fail_free;
d5c12070
MX		 618 }
619 trans->block_rsv = &block_rsv;
620 trans->bytes_reserved = block_rsv.size;
f46b5a66 621
a9377422 622 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
6f72c7e2
AJ		 623 if (ret)
624 goto fail;
625
4d75f8a9 626 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 627 if (IS_ERR(leaf)) {
628 ret = PTR_ERR(leaf);
629 goto fail;
630 }
f46b5a66 631
f46b5a66
CH		 632 btrfs_mark_buffer_dirty(leaf);
633
49a3c4d9 634 inode_item = &root_item->inode;
3cae210f
QW		 635 btrfs_set_stack_inode_generation(inode_item, 1);
636 btrfs_set_stack_inode_size(inode_item, 3);
637 btrfs_set_stack_inode_nlink(inode_item, 1);
da17066c 638 btrfs_set_stack_inode_nbytes(inode_item,
0b246afa 639 fs_info->nodesize);
3cae210f 640 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
f46b5a66 641
49a3c4d9
DS		 642 btrfs_set_root_flags(root_item, 0);
643 btrfs_set_root_limit(root_item, 0);
3cae210f 644 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
08fe4db1 645
49a3c4d9
DS		 646 btrfs_set_root_bytenr(root_item, leaf->start);
647 btrfs_set_root_generation(root_item, trans->transid);
648 btrfs_set_root_level(root_item, 0);
649 btrfs_set_root_refs(root_item, 1);
650 btrfs_set_root_used(root_item, leaf->len);
651 btrfs_set_root_last_snapshot(root_item, 0);
f46b5a66 652
49a3c4d9
DS		 653 btrfs_set_root_generation_v2(root_item,
654 btrfs_root_generation(root_item));
8ea05e3a 655 uuid_le_gen(&new_uuid);
49a3c4d9
DS		 656 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
657 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
658 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
659 root_item->ctime = root_item->otime;
660 btrfs_set_root_ctransid(root_item, trans->transid);
661 btrfs_set_root_otransid(root_item, trans->transid);
f46b5a66 662
925baedd 663 btrfs_tree_unlock(leaf);
f46b5a66
CH		 664 free_extent_buffer(leaf);
665 leaf = NULL;
666
49a3c4d9 667 btrfs_set_root_dirid(root_item, new_dirid);
f46b5a66
CH		 668
669 key.objectid = objectid;
5d4f98a2 670 key.offset = 0;
962a298f 671 key.type = BTRFS_ROOT_ITEM_KEY;
0b246afa 672 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
49a3c4d9 673 root_item);
f46b5a66
CH		 674 if (ret)
675 goto fail;
676
76dda93c 677 key.offset = (u64)-1;
0b246afa 678 new_root = btrfs_read_fs_root_no_name(fs_info, &key);
79787eaa 679 if (IS_ERR(new_root)) {
79787eaa 680 ret = PTR_ERR(new_root);
66642832 681 btrfs_abort_transaction(trans, ret);
79787eaa
JM		 682 goto fail;
683 }
76dda93c
YZ		 684
685 btrfs_record_root_in_trans(trans, new_root);
686
63541927 687 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
ce598979
MF		 688 if (ret) {
689 /* We potentially lose an unused inode item here */
66642832 690 btrfs_abort_transaction(trans, ret);
ce598979
MF		 691 goto fail;
692 }
693
f32e48e9
CR		 694 mutex_lock(&new_root->objectid_mutex);
695 new_root->highest_objectid = new_dirid;
696 mutex_unlock(&new_root->objectid_mutex);
697
f46b5a66
CH		 698 /*
699 * insert the directory item
700 */
877574e2 701 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
79787eaa 702 if (ret) {
66642832 703 btrfs_abort_transaction(trans, ret);
79787eaa
JM		 704 goto fail;
705 }
3de4586c 706
684572df 707 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
3de4586c 708 BTRFS_FT_DIR, index);
79787eaa 709 if (ret) {
66642832 710 btrfs_abort_transaction(trans, ret);
f46b5a66 711 goto fail;
79787eaa 712 }
0660b5af 713
6ef06d27 714 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
52c26179
YZ		 715 ret = btrfs_update_inode(trans, root, dir);
716 BUG_ON(ret);
717
6025c19f 718 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
4a0cc7ca 719 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
76dda93c 720 BUG_ON(ret);
f46b5a66 721
cdb345a8 722 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
6bccf3ab 723 BTRFS_UUID_KEY_SUBVOL, objectid);
dd5f9615 724 if (ret)
66642832 725 btrfs_abort_transaction(trans, ret);
dd5f9615 726
f46b5a66 727fail:
49a3c4d9 728 kfree(root_item);
d5c12070
MX		 729 trans->block_rsv = NULL;
730 trans->bytes_reserved = 0;
7775c818 731 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
de6e8200 732
72fd032e
SW		 733 if (async_transid) {
734 *async_transid = trans->transid;
3a45bb20 735 err = btrfs_commit_transaction_async(trans, 1);
00d71c9c 736 if (err)
3a45bb20 737 err = btrfs_commit_transaction(trans);
72fd032e 738 } else {
3a45bb20 739 err = btrfs_commit_transaction(trans);
72fd032e 740 }
f46b5a66
CH		 741 if (err && !ret)
742 ret = err;
1a65e24b 743
5662344b
TI		 744 if (!ret) {
745 inode = btrfs_lookup_dentry(dir, dentry);
de6e8200
LB		 746 if (IS_ERR(inode))
747 return PTR_ERR(inode);
5662344b
TI		 748 d_instantiate(dentry, inode);
749 }
f46b5a66 750 return ret;
49a3c4d9
DS		 751
752fail_free:
753 kfree(root_item);
754 return ret;
f46b5a66
CH		 755}
756
e9662f70 757static int create_snapshot(struct btrfs_root *root, struct inode *dir,
61d7e4cb 758 struct dentry *dentry,
e9662f70
MX		 759 u64 *async_transid, bool readonly,
760 struct btrfs_qgroup_inherit *inherit)
f46b5a66 761{
0b246afa 762 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
2e4bfab9 763 struct inode *inode;
f46b5a66
CH		 764 struct btrfs_pending_snapshot *pending_snapshot;
765 struct btrfs_trans_handle *trans;
2e4bfab9 766 int ret;
8ecebf4d 767 bool snapshot_force_cow = false;
f46b5a66 768
27cdeb70 769 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
f46b5a66
CH		 770 return -EINVAL;
771
eede2bf3
OS		 772 if (atomic_read(&root->nr_swapfiles)) {
773 btrfs_warn(fs_info,
774 "cannot snapshot subvolume with active swapfile");
775 return -ETXTBSY;
776 }
777
23269bf5 778 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
a1ee7362
DS		 779 if (!pending_snapshot)
780 return -ENOMEM;
781
b0c0ea63 782 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
23269bf5 783 GFP_KERNEL);
8546b570
DS		 784 pending_snapshot->path = btrfs_alloc_path();
785 if (!pending_snapshot->root_item || !pending_snapshot->path) {
b0c0ea63
DS		 786 ret = -ENOMEM;
787 goto free_pending;
788 }
789
8ecebf4d
RK		 790 /*
791 * Force new buffered writes to reserve space even when NOCOW is
792 * possible. This is to avoid later writeback (running dealloc) to
793 * fallback to COW mode and unexpectedly fail with ENOSPC.
794 */
ea14b57f 795 atomic_inc(&root->will_be_snapshotted);
4e857c58 796 smp_mb__after_atomic();
45bac0f3
LB		 797 /* wait for no snapshot writes */
798 wait_event(root->subv_writers->wait,
799 percpu_counter_sum(&root->subv_writers->counter) == 0);
8257b2dc 800
3cd24c69 801 ret = btrfs_start_delalloc_snapshot(root);
6a03843d 802 if (ret)
a1ee7362 803 goto dec_and_free;
6a03843d 804
8ecebf4d
RK		 805 /*
806 * All previous writes have started writeback in NOCOW mode, so now
807 * we force future writes to fallback to COW mode during snapshot
808 * creation.
809 */
810 atomic_inc(&root->snapshot_force_cow);
811 snapshot_force_cow = true;
812
6374e57a 813 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
6a03843d 814
66d8f3dd
MX		 815 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
816 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 817 /*
818 * 1 - parent dir inode
819 * 2 - dir entries
820 * 1 - root item
821 * 2 - root ref/backref
822 * 1 - root of snapshot
dd5f9615 823 * 1 - UUID item
d5c12070
MX		 824 */
825 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
dd5f9615 826 &pending_snapshot->block_rsv, 8,
ee3441b4 827 false);
d5c12070 828 if (ret)
a1ee7362 829 goto dec_and_free;
d5c12070 830
3de4586c 831 pending_snapshot->dentry = dentry;
f46b5a66 832 pending_snapshot->root = root;
b83cc969 833 pending_snapshot->readonly = readonly;
e9662f70 834 pending_snapshot->dir = dir;
8696c533 835 pending_snapshot->inherit = inherit;
a22285a6 836
d5c12070 837 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 838 if (IS_ERR(trans)) {
839 ret = PTR_ERR(trans);
840 goto fail;
841 }
842
0b246afa 843 spin_lock(&fs_info->trans_lock);
f46b5a66
CH		 844 list_add(&pending_snapshot->list,
845 &trans->transaction->pending_snapshots);
0b246afa 846 spin_unlock(&fs_info->trans_lock);
72fd032e
SW		 847 if (async_transid) {
848 *async_transid = trans->transid;
3a45bb20 849 ret = btrfs_commit_transaction_async(trans, 1);
00d71c9c 850 if (ret)
3a45bb20 851 ret = btrfs_commit_transaction(trans);
72fd032e 852 } else {
3a45bb20 853 ret = btrfs_commit_transaction(trans);
72fd032e 854 }
aec8030a 855 if (ret)
c37b2b62 856 goto fail;
a22285a6
YZ		 857
858 ret = pending_snapshot->error;
859 if (ret)
860 goto fail;
861
d3797308
CM		 862 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
863 if (ret)
864 goto fail;
865
2b0143b5 866 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
2e4bfab9
YZ		 867 if (IS_ERR(inode)) {
868 ret = PTR_ERR(inode);
869 goto fail;
870 }
5662344b 871
2e4bfab9
YZ		 872 d_instantiate(dentry, inode);
873 ret = 0;
874fail:
7775c818 875 btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
a1ee7362 876dec_and_free:
8ecebf4d
RK		 877 if (snapshot_force_cow)
878 atomic_dec(&root->snapshot_force_cow);
ea14b57f 879 if (atomic_dec_and_test(&root->will_be_snapshotted))
4625956a 880 wake_up_var(&root->will_be_snapshotted);
b0c0ea63
DS		 881free_pending:
882 kfree(pending_snapshot->root_item);
8546b570 883 btrfs_free_path(pending_snapshot->path);
a1ee7362
DS		 884 kfree(pending_snapshot);
885
f46b5a66
CH		 886 return ret;
887}
888
4260f7c7
SW		 889/* copy of may_delete in fs/namei.c()
890 * Check whether we can remove a link victim from directory dir, check
891 * whether the type of victim is right.
892 * 1. We can't do it if dir is read-only (done in permission())
893 * 2. We should have write and exec permissions on dir
894 * 3. We can't remove anything from append-only dir
895 * 4. We can't do anything with immutable dir (done in permission())
896 * 5. If the sticky bit on dir is set we should either
897 * a. be owner of dir, or
898 * b. be owner of victim, or
899 * c. have CAP_FOWNER capability
01327610 900 * 6. If the victim is append-only or immutable we can't do anything with
4260f7c7
SW		 901 * links pointing to it.
902 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
903 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
904 * 9. We can't remove a root or mountpoint.
905 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
906 * nfs_async_unlink().
907 */
908
67871254 909static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
4260f7c7
SW		 910{
911 int error;
912
2b0143b5 913 if (d_really_is_negative(victim))
4260f7c7
SW		 914 return -ENOENT;
915
2b0143b5 916 BUG_ON(d_inode(victim->d_parent) != dir);
4fa6b5ec 917 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 918
919 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
920 if (error)
921 return error;
922 if (IS_APPEND(dir))
923 return -EPERM;
2b0143b5
DH		 924 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
925 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
4260f7c7
SW		 926 return -EPERM;
927 if (isdir) {
e36cb0b8 928 if (!d_is_dir(victim))
4260f7c7
SW		 929 return -ENOTDIR;
930 if (IS_ROOT(victim))
931 return -EBUSY;
e36cb0b8 932 } else if (d_is_dir(victim))
4260f7c7
SW		 933 return -EISDIR;
934 if (IS_DEADDIR(dir))
935 return -ENOENT;
936 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
937 return -EBUSY;
938 return 0;
939}
940
cb8e7090
CH		 941/* copy of may_create in fs/namei.c() */
942static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
943{
2b0143b5 944 if (d_really_is_positive(child))
cb8e7090
CH		 945 return -EEXIST;
946 if (IS_DEADDIR(dir))
947 return -ENOENT;
948 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
949}
950
951/*
952 * Create a new subvolume below @parent. This is largely modeled after
953 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
954 * inside this filesystem so it's quite a bit simpler.
955 */
92872094 956static noinline int btrfs_mksubvol(const struct path *parent,
52f75f4f 957 const char *name, int namelen,
72fd032e 958 struct btrfs_root *snap_src,
6f72c7e2 959 u64 *async_transid, bool readonly,
8696c533 960 struct btrfs_qgroup_inherit *inherit)
cb8e7090 961{
0b246afa
JM		 962 struct inode *dir = d_inode(parent->dentry);
963 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
cb8e7090
CH		 964 struct dentry *dentry;
965 int error;
966
00235411
AV		 967 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
968 if (error == -EINTR)
969 return error;
cb8e7090
CH		 970
971 dentry = lookup_one_len(name, parent->dentry, namelen);
972 error = PTR_ERR(dentry);
973 if (IS_ERR(dentry))
974 goto out_unlock;
975
76dda93c 976 error = btrfs_may_create(dir, dentry);
cb8e7090 977 if (error)
a874a63e 978 goto out_dput;
cb8e7090 979
9c52057c
CM		 980 /*
981 * even if this name doesn't exist, we may get hash collisions.
982 * check for them now when we can safely fail
983 */
984 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
985 dir->i_ino, name,
986 namelen);
987 if (error)
988 goto out_dput;
989
0b246afa 990 down_read(&fs_info->subvol_sem);
76dda93c
YZ		 991
992 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
993 goto out_up_read;
994
3de4586c 995 if (snap_src) {
61d7e4cb 996 error = create_snapshot(snap_src, dir, dentry,
6f72c7e2 997 async_transid, readonly, inherit);
3de4586c 998 } else {
d5c12070
MX		 999 error = create_subvol(dir, dentry, name, namelen,
1000 async_transid, inherit);
3de4586c 1001 }
76dda93c
YZ		 1002 if (!error)
1003 fsnotify_mkdir(dir, dentry);
1004out_up_read:
0b246afa 1005 up_read(&fs_info->subvol_sem);
cb8e7090
CH		 1006out_dput:
1007 dput(dentry);
1008out_unlock:
5955102c 1009 inode_unlock(dir);
cb8e7090
CH		 1010 return error;
1011}
1012
4cb5300b
CM		 1013/*
1014 * When we're defragging a range, we don't want to kick it off again
1015 * if it is really just waiting for delalloc to send it down.
1016 * If we find a nice big extent or delalloc range for the bytes in the
1017 * file you want to defrag, we return 0 to let you know to skip this
1018 * part of the file
1019 */
aab110ab 1020static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
4cb5300b
CM		 1021{
1022 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1023 struct extent_map *em = NULL;
1024 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1025 u64 end;
1026
1027 read_lock(&em_tree->lock);
09cbfeaf 1028 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
4cb5300b
CM		 1029 read_unlock(&em_tree->lock);
1030
1031 if (em) {
1032 end = extent_map_end(em);
1033 free_extent_map(em);
1034 if (end - offset > thresh)
1035 return 0;
1036 }
1037 /* if we already have a nice delalloc here, just stop */
1038 thresh /= 2;
1039 end = count_range_bits(io_tree, &offset, offset + thresh,
1040 thresh, EXTENT_DELALLOC, 1);
1041 if (end >= thresh)
1042 return 0;
1043 return 1;
1044}
1045
1046/*
1047 * helper function to walk through a file and find extents
1048 * newer than a specific transid, and smaller than thresh.
1049 *
1050 * This is used by the defragging code to find new and small
1051 * extents
1052 */
1053static int find_new_extents(struct btrfs_root *root,
1054 struct inode *inode, u64 newer_than,
aab110ab 1055 u64 *off, u32 thresh)
4cb5300b
CM		 1056{
1057 struct btrfs_path *path;
1058 struct btrfs_key min_key;
4cb5300b
CM		 1059 struct extent_buffer *leaf;
1060 struct btrfs_file_extent_item *extent;
1061 int type;
1062 int ret;
4a0cc7ca 1063 u64 ino = btrfs_ino(BTRFS_I(inode));
4cb5300b
CM		 1064
1065 path = btrfs_alloc_path();
1066 if (!path)
1067 return -ENOMEM;
1068
a4689d2b 1069 min_key.objectid = ino;
4cb5300b
CM		 1070 min_key.type = BTRFS_EXTENT_DATA_KEY;
1071 min_key.offset = *off;
1072
67871254 1073 while (1) {
6174d3cb 1074 ret = btrfs_search_forward(root, &min_key, path, newer_than);
4cb5300b
CM		 1075 if (ret != 0)
1076 goto none;
f094c9bd 1077process_slot:
a4689d2b 1078 if (min_key.objectid != ino)
4cb5300b
CM		 1079 goto none;
1080 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1081 goto none;
1082
1083 leaf = path->nodes[0];
1084 extent = btrfs_item_ptr(leaf, path->slots[0],
1085 struct btrfs_file_extent_item);
1086
1087 type = btrfs_file_extent_type(leaf, extent);
1088 if (type == BTRFS_FILE_EXTENT_REG &&
1089 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1090 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1091 *off = min_key.offset;
1092 btrfs_free_path(path);
1093 return 0;
1094 }
1095
f094c9bd
FM		 1096 path->slots[0]++;
1097 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1098 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1099 goto process_slot;
1100 }
1101
4cb5300b
CM		 1102 if (min_key.offset == (u64)-1)
1103 goto none;
1104
1105 min_key.offset++;
1106 btrfs_release_path(path);
1107 }
1108none:
1109 btrfs_free_path(path);
1110 return -ENOENT;
1111}
1112
6c282eb4 1113static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 1114{
1115 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 1116 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1117 struct extent_map *em;
09cbfeaf 1118 u64 len = PAGE_SIZE;
17ce6ef8 1119
6c282eb4
LZ		 1120 /*
1121 * hopefully we have this extent in the tree already, try without
1122 * the full extent lock
1123 */
17ce6ef8 1124 read_lock(&em_tree->lock);
6c282eb4 1125 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 1126 read_unlock(&em_tree->lock);
1127
6c282eb4 1128 if (!em) {
308d9800
FM		 1129 struct extent_state *cached = NULL;
1130 u64 end = start + len - 1;
1131
6c282eb4 1132 /* get the big lock and read metadata off disk */
ff13db41 1133 lock_extent_bits(io_tree, start, end, &cached);
fc4f21b1 1134 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
e43bbe5e 1135 unlock_extent_cached(io_tree, start, end, &cached);
6c282eb4
LZ		 1136
1137 if (IS_ERR(em))
1138 return NULL;
1139 }
1140
1141 return em;
1142}
17ce6ef8 1143
6c282eb4
LZ		 1144static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1145{
1146 struct extent_map *next;
1147 bool ret = true;
1148
1149 /* this is the last extent */
1150 if (em->start + em->len >= i_size_read(inode))
1151 return false;
1152
1153 next = defrag_lookup_extent(inode, em->start + em->len);
e9512d72
CM		 1154 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1155 ret = false;
1156 else if ((em->block_start + em->block_len == next->block_start) &&
ee22184b 1157 (em->block_len > SZ_128K && next->block_len > SZ_128K))
6c282eb4
LZ		 1158 ret = false;
1159
1160 free_extent_map(next);
17ce6ef8
LB		 1161 return ret;
1162}
1163
aab110ab 1164static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
a43a2111
AM		 1165 u64 *last_len, u64 *skip, u64 *defrag_end,
1166 int compress)
940100a4 1167{
6c282eb4 1168 struct extent_map *em;
940100a4 1169 int ret = 1;
6c282eb4 1170 bool next_mergeable = true;
4a3560c4 1171 bool prev_mergeable = true;
940100a4
CM		 1172
1173 /*
008873ea 1174 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 1175 * defragging it
1176 */
1177 if (start < *defrag_end)
1178 return 1;
1179
1180 *skip = 0;
1181
6c282eb4
LZ		 1182 em = defrag_lookup_extent(inode, start);
1183 if (!em)
1184 return 0;
940100a4
CM		 1185
1186 /* this will cover holes, and inline extents */
17ce6ef8 1187 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 1188 ret = 0;
17ce6ef8
LB		 1189 goto out;
1190 }
1191
4a3560c4
LB		 1192 if (!*defrag_end)
1193 prev_mergeable = false;
1194
6c282eb4 1195 next_mergeable = defrag_check_next_extent(inode, em);
940100a4 1196 /*
6c282eb4
LZ		 1197 * we hit a real extent, if it is big or the next extent is not a
1198 * real extent, don't bother defragging it
940100a4 1199 */
a43a2111 1200 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
4a3560c4 1201 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
940100a4 1202 ret = 0;
17ce6ef8 1203out:
940100a4
CM		 1204 /*
1205 * last_len ends up being a counter of how many bytes we've defragged.
1206 * every time we choose not to defrag an extent, we reset *last_len
1207 * so that the next tiny extent will force a defrag.
1208 *
1209 * The end result of this is that tiny extents before a single big
1210 * extent will force at least part of that big extent to be defragged.
1211 */
1212 if (ret) {
940100a4
CM		 1213 *defrag_end = extent_map_end(em);
1214 } else {
1215 *last_len = 0;
1216 *skip = extent_map_end(em);
1217 *defrag_end = 0;
1218 }
1219
1220 free_extent_map(em);
1221 return ret;
1222}
1223
4cb5300b
CM		 1224/*
1225 * it doesn't do much good to defrag one or two pages
1226 * at a time. This pulls in a nice chunk of pages
1227 * to COW and defrag.
1228 *
1229 * It also makes sure the delalloc code has enough
1230 * dirty data to avoid making new small extents as part
1231 * of the defrag
1232 *
1233 * It's a good idea to start RA on this range
1234 * before calling this.
1235 */
1236static int cluster_pages_for_defrag(struct inode *inode,
1237 struct page **pages,
1238 unsigned long start_index,
c41570c9 1239 unsigned long num_pages)
f46b5a66 1240{
4cb5300b
CM		 1241 unsigned long file_end;
1242 u64 isize = i_size_read(inode);
1243 u64 page_start;
1244 u64 page_end;
1f12bd06 1245 u64 page_cnt;
4cb5300b
CM		 1246 int ret;
1247 int i;
1248 int i_done;
3eaa2885 1249 struct btrfs_ordered_extent *ordered;
4cb5300b 1250 struct extent_state *cached_state = NULL;
600a45e1 1251 struct extent_io_tree *tree;
364ecf36 1252 struct extent_changeset *data_reserved = NULL;
3b16a4e3 1253 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1254
09cbfeaf 1255 file_end = (isize - 1) >> PAGE_SHIFT;
1f12bd06
LB		 1256 if (!isize || start_index > file_end)
1257 return 0;
1258
1259 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b 1260
364ecf36 1261 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
09cbfeaf
KS		 1262 start_index << PAGE_SHIFT,
1263 page_cnt << PAGE_SHIFT);
4cb5300b
CM		 1264 if (ret)
1265 return ret;
4cb5300b 1266 i_done = 0;
600a45e1 1267 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1268
1269 /* step one, lock all the pages */
1f12bd06 1270 for (i = 0; i < page_cnt; i++) {
4cb5300b 1271 struct page *page;
600a45e1 1272again:
a94733d0 1273 page = find_or_create_page(inode->i_mapping,
600a45e1 1274 start_index + i, mask);
4cb5300b
CM		 1275 if (!page)
1276 break;
1277
600a45e1 1278 page_start = page_offset(page);
09cbfeaf 1279 page_end = page_start + PAGE_SIZE - 1;
600a45e1 1280 while (1) {
308d9800 1281 lock_extent_bits(tree, page_start, page_end,
ff13db41 1282 &cached_state);
600a45e1
MX		 1283 ordered = btrfs_lookup_ordered_extent(inode,
1284 page_start);
308d9800 1285 unlock_extent_cached(tree, page_start, page_end,
e43bbe5e 1286 &cached_state);
600a45e1
MX		 1287 if (!ordered)
1288 break;
1289
1290 unlock_page(page);
1291 btrfs_start_ordered_extent(inode, ordered, 1);
1292 btrfs_put_ordered_extent(ordered);
1293 lock_page(page);
1f12bd06
LB		 1294 /*
1295 * we unlocked the page above, so we need check if
1296 * it was released or not.
1297 */
1298 if (page->mapping != inode->i_mapping) {
1299 unlock_page(page);
09cbfeaf 1300 put_page(page);
1f12bd06
LB		 1301 goto again;
1302 }
600a45e1
MX		 1303 }
1304
4cb5300b
CM		 1305 if (!PageUptodate(page)) {
1306 btrfs_readpage(NULL, page);
1307 lock_page(page);
1308 if (!PageUptodate(page)) {
1309 unlock_page(page);
09cbfeaf 1310 put_page(page);
4cb5300b
CM		 1311 ret = -EIO;
1312 break;
1313 }
1314 }
600a45e1 1315
600a45e1
MX		 1316 if (page->mapping != inode->i_mapping) {
1317 unlock_page(page);
09cbfeaf 1318 put_page(page);
600a45e1
MX		 1319 goto again;
1320 }
1321
4cb5300b
CM		 1322 pages[i] = page;
1323 i_done++;
1324 }
1325 if (!i_done || ret)
1326 goto out;
1327
1751e8a6 1328 if (!(inode->i_sb->s_flags & SB_ACTIVE))
4cb5300b
CM		 1329 goto out;
1330
1331 /*
1332 * so now we have a nice long stream of locked
1333 * and up to date pages, lets wait on them
1334 */
1335 for (i = 0; i < i_done; i++)
1336 wait_on_page_writeback(pages[i]);
1337
1338 page_start = page_offset(pages[0]);
09cbfeaf 1339 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
4cb5300b
CM		 1340
1341 lock_extent_bits(&BTRFS_I(inode)->io_tree,
ff13db41 1342 page_start, page_end - 1, &cached_state);
4cb5300b
CM		 1343 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1344 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b 1345 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
ae0f1625 1346 &cached_state);
4cb5300b 1347
1f12bd06 1348 if (i_done != page_cnt) {
9e0baf60 1349 spin_lock(&BTRFS_I(inode)->lock);
28c4a3e2 1350 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
9e0baf60 1351 spin_unlock(&BTRFS_I(inode)->lock);
bc42bda2 1352 btrfs_delalloc_release_space(inode, data_reserved,
09cbfeaf 1353 start_index << PAGE_SHIFT,
43b18595 1354 (page_cnt - i_done) << PAGE_SHIFT, true);
4cb5300b
CM		 1355 }
1356
1357
9e8a4a8b 1358 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
018ed4f7 1359 &cached_state);
4cb5300b
CM		 1360
1361 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
e43bbe5e 1362 page_start, page_end - 1, &cached_state);
4cb5300b
CM		 1363
1364 for (i = 0; i < i_done; i++) {
1365 clear_page_dirty_for_io(pages[i]);
1366 ClearPageChecked(pages[i]);
1367 set_page_extent_mapped(pages[i]);
1368 set_page_dirty(pages[i]);
1369 unlock_page(pages[i]);
09cbfeaf 1370 put_page(pages[i]);
4cb5300b 1371 }
43b18595
QW		 1372 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1373 false);
364ecf36 1374 extent_changeset_free(data_reserved);
4cb5300b
CM		 1375 return i_done;
1376out:
1377 for (i = 0; i < i_done; i++) {
1378 unlock_page(pages[i]);
09cbfeaf 1379 put_page(pages[i]);
4cb5300b 1380 }
bc42bda2 1381 btrfs_delalloc_release_space(inode, data_reserved,
09cbfeaf 1382 start_index << PAGE_SHIFT,
43b18595
QW		 1383 page_cnt << PAGE_SHIFT, true);
1384 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT,
1385 true);
364ecf36 1386 extent_changeset_free(data_reserved);
4cb5300b
CM		 1387 return ret;
1388
1389}
1390
1391int btrfs_defrag_file(struct inode *inode, struct file *file,
1392 struct btrfs_ioctl_defrag_range_args *range,
1393 u64 newer_than, unsigned long max_to_defrag)
1394{
0b246afa 1395 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4cb5300b 1396 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1397 struct file_ra_state *ra = NULL;
f46b5a66 1398 unsigned long last_index;
151a31b2 1399 u64 isize = i_size_read(inode);
940100a4
CM		 1400 u64 last_len = 0;
1401 u64 skip = 0;
1402 u64 defrag_end = 0;
4cb5300b 1403 u64 newer_off = range->start;
f46b5a66 1404 unsigned long i;
008873ea 1405 unsigned long ra_index = 0;
f46b5a66 1406 int ret;
4cb5300b 1407 int defrag_count = 0;
1a419d85 1408 int compress_type = BTRFS_COMPRESS_ZLIB;
aab110ab 1409 u32 extent_thresh = range->extent_thresh;
09cbfeaf 1410 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
c41570c9 1411 unsigned long cluster = max_cluster;
ee22184b 1412 u64 new_align = ~((u64)SZ_128K - 1);
4cb5300b 1413 struct page **pages = NULL;
1e2ef46d 1414 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
4cb5300b 1415
0abd5b17
LB		 1416 if (isize == 0)
1417 return 0;
1418
1419 if (range->start >= isize)
1420 return -EINVAL;
1a419d85 1421
1e2ef46d 1422 if (do_compress) {
1a419d85
LZ		 1423 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1424 return -EINVAL;
1425 if (range->compress_type)
1426 compress_type = range->compress_type;
1427 }
f46b5a66 1428
0abd5b17 1429 if (extent_thresh == 0)
ee22184b 1430 extent_thresh = SZ_256K;
940100a4 1431
4cb5300b 1432 /*
0a52d108
DS		 1433 * If we were not given a file, allocate a readahead context. As
1434 * readahead is just an optimization, defrag will work without it so
1435 * we don't error out.
4cb5300b
CM		 1436 */
1437 if (!file) {
63e727ec 1438 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
0a52d108
DS		 1439 if (ra)
1440 file_ra_state_init(ra, inode->i_mapping);
4cb5300b
CM		 1441 } else {
1442 ra = &file->f_ra;
1443 }
1444
63e727ec 1445 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
4cb5300b
CM		 1446 if (!pages) {
1447 ret = -ENOMEM;
1448 goto out_ra;
1449 }
1450
1451 /* find the last page to defrag */
1e701a32 1452 if (range->start + range->len > range->start) {
151a31b2 1453 last_index = min_t(u64, isize - 1,
09cbfeaf 1454 range->start + range->len - 1) >> PAGE_SHIFT;
1e701a32 1455 } else {
09cbfeaf 1456 last_index = (isize - 1) >> PAGE_SHIFT;
1e701a32
CM		 1457 }
1458
4cb5300b
CM		 1459 if (newer_than) {
1460 ret = find_new_extents(root, inode, newer_than,
ee22184b 1461 &newer_off, SZ_64K);
4cb5300b
CM		 1462 if (!ret) {
1463 range->start = newer_off;
1464 /*
1465 * we always align our defrag to help keep
1466 * the extents in the file evenly spaced
1467 */
09cbfeaf 1468 i = (newer_off & new_align) >> PAGE_SHIFT;
4cb5300b
CM		 1469 } else
1470 goto out_ra;
1471 } else {
09cbfeaf 1472 i = range->start >> PAGE_SHIFT;
4cb5300b
CM		 1473 }
1474 if (!max_to_defrag)
070034bd 1475 max_to_defrag = last_index - i + 1;
4cb5300b 1476
2a0f7f57
LZ		 1477 /*
1478 * make writeback starts from i, so the defrag range can be
1479 * written sequentially.
1480 */
1481 if (i < inode->i_mapping->writeback_index)
1482 inode->i_mapping->writeback_index = i;
1483
f7f43cc8 1484 while (i <= last_index && defrag_count < max_to_defrag &&
09cbfeaf 1485 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
4cb5300b
CM		 1486 /*
1487 * make sure we stop running if someone unmounts
1488 * the FS
1489 */
1751e8a6 1490 if (!(inode->i_sb->s_flags & SB_ACTIVE))
4cb5300b
CM		 1491 break;
1492
0b246afa
JM		 1493 if (btrfs_defrag_cancelled(fs_info)) {
1494 btrfs_debug(fs_info, "defrag_file cancelled");
210549eb
DS		 1495 ret = -EAGAIN;
1496 break;
1497 }
1498
09cbfeaf 1499 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
6c282eb4 1500 extent_thresh, &last_len, &skip,
1e2ef46d 1501 &defrag_end, do_compress)){
940100a4
CM		 1502 unsigned long next;
1503 /*
1504 * the should_defrag function tells us how much to skip
1505 * bump our counter by the suggested amount
1506 */
09cbfeaf 1507 next = DIV_ROUND_UP(skip, PAGE_SIZE);
940100a4
CM		 1508 i = max(i + 1, next);
1509 continue;
1510 }
008873ea
LZ		 1511
1512 if (!newer_than) {
09cbfeaf
KS		 1513 cluster = (PAGE_ALIGN(defrag_end) >>
1514 PAGE_SHIFT) - i;
008873ea
LZ		 1515 cluster = min(cluster, max_cluster);
1516 } else {
1517 cluster = max_cluster;
1518 }
1519
008873ea
LZ		 1520 if (i + cluster > ra_index) {
1521 ra_index = max(i, ra_index);
0a52d108 1522 if (ra)
d3c0bab5
DS		 1523 page_cache_sync_readahead(inode->i_mapping, ra,
1524 file, ra_index, cluster);
e4826a5b 1525 ra_index += cluster;
008873ea 1526 }
940100a4 1527
5955102c 1528 inode_lock(inode);
eede2bf3
OS		 1529 if (IS_SWAPFILE(inode)) {
1530 ret = -ETXTBSY;
1531 } else {
1532 if (do_compress)
1533 BTRFS_I(inode)->defrag_compress = compress_type;
1534 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1535 }
ecb8bea8 1536 if (ret < 0) {
5955102c 1537 inode_unlock(inode);
4cb5300b 1538 goto out_ra;
ecb8bea8 1539 }
4cb5300b
CM		 1540
1541 defrag_count += ret;
d0e1d66b 1542 balance_dirty_pages_ratelimited(inode->i_mapping);
5955102c 1543 inode_unlock(inode);
4cb5300b
CM		 1544
1545 if (newer_than) {
1546 if (newer_off == (u64)-1)
1547 break;
1548
e1f041e1
LB		 1549 if (ret > 0)
1550 i += ret;
1551
4cb5300b 1552 newer_off = max(newer_off + 1,
09cbfeaf 1553 (u64)i << PAGE_SHIFT);
4cb5300b 1554
ee22184b
BL		 1555 ret = find_new_extents(root, inode, newer_than,
1556 &newer_off, SZ_64K);
4cb5300b
CM		 1557 if (!ret) {
1558 range->start = newer_off;
09cbfeaf 1559 i = (newer_off & new_align) >> PAGE_SHIFT;
4cb5300b
CM		 1560 } else {
1561 break;
f46b5a66 1562 }
4cb5300b 1563 } else {
008873ea 1564 if (ret > 0) {
cbcc8326 1565 i += ret;
09cbfeaf 1566 last_len += ret << PAGE_SHIFT;
008873ea 1567 } else {
cbcc8326 1568 i++;
008873ea
LZ		 1569 last_len = 0;
1570 }
f46b5a66 1571 }
f46b5a66
CH		 1572 }
1573
dec8ef90 1574 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1e701a32 1575 filemap_flush(inode->i_mapping);
dec8ef90
FM		 1576 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1577 &BTRFS_I(inode)->runtime_flags))
1578 filemap_flush(inode->i_mapping);
1579 }
1e701a32 1580
1a419d85 1581 if (range->compress_type == BTRFS_COMPRESS_LZO) {
0b246afa 1582 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
5c1aab1d
NT		 1583 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1584 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1a419d85
LZ		 1585 }
1586
60ccf82f 1587 ret = defrag_count;
940100a4 1588
4cb5300b 1589out_ra:
1e2ef46d 1590 if (do_compress) {
5955102c 1591 inode_lock(inode);
eec63c65 1592 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
5955102c 1593 inode_unlock(inode);
633085c7 1594 }
4cb5300b
CM		 1595 if (!file)
1596 kfree(ra);
1597 kfree(pages);
940100a4 1598 return ret;
f46b5a66
CH		 1599}
1600
198605a8 1601static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1602 void __user *arg)
f46b5a66 1603{
0b246afa
JM		 1604 struct inode *inode = file_inode(file);
1605 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f46b5a66
CH		 1606 u64 new_size;
1607 u64 old_size;
1608 u64 devid = 1;
0b246afa 1609 struct btrfs_root *root = BTRFS_I(inode)->root;
f46b5a66
CH		 1610 struct btrfs_ioctl_vol_args *vol_args;
1611 struct btrfs_trans_handle *trans;
1612 struct btrfs_device *device = NULL;
1613 char *sizestr;
9a40f122 1614 char *retptr;
f46b5a66
CH		 1615 char *devstr = NULL;
1616 int ret = 0;
f46b5a66
CH		 1617 int mod = 0;
1618
e441d54d
CM		 1619 if (!capable(CAP_SYS_ADMIN))
1620 return -EPERM;
1621
198605a8
MX		 1622 ret = mnt_want_write_file(file);
1623 if (ret)
1624 return ret;
1625
171938e5 1626 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
97547676 1627 mnt_drop_write_file(file);
e57138b3 1628 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1629 }
1630
dae7b665 1631 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1632 if (IS_ERR(vol_args)) {
1633 ret = PTR_ERR(vol_args);
1634 goto out;
1635 }
5516e595
MF		 1636
1637 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1638
f46b5a66
CH		 1639 sizestr = vol_args->name;
1640 devstr = strchr(sizestr, ':');
1641 if (devstr) {
f46b5a66
CH		 1642 sizestr = devstr + 1;
1643 *devstr = '\0';
1644 devstr = vol_args->name;
58dfae63
Z		 1645 ret = kstrtoull(devstr, 10, &devid);
1646 if (ret)
1647 goto out_free;
dfd79829
MX		 1648 if (!devid) {
1649 ret = -EINVAL;
1650 goto out_free;
1651 }
0b246afa 1652 btrfs_info(fs_info, "resizing devid %llu", devid);
f46b5a66 1653 }
dba60f3f 1654
09ba3bc9 1655 device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
f46b5a66 1656 if (!device) {
0b246afa
JM		 1657 btrfs_info(fs_info, "resizer unable to find device %llu",
1658 devid);
dfd79829 1659 ret = -ENODEV;
c9e9f97b 1660 goto out_free;
f46b5a66 1661 }
dba60f3f 1662
ebbede42 1663 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
0b246afa 1664 btrfs_info(fs_info,
efe120a0 1665 "resizer unable to apply on readonly device %llu",
c1c9ff7c 1666 devid);
dfd79829 1667 ret = -EPERM;
4e42ae1b
LB		 1668 goto out_free;
1669 }
1670
f46b5a66
CH		 1671 if (!strcmp(sizestr, "max"))
1672 new_size = device->bdev->bd_inode->i_size;
1673 else {
1674 if (sizestr[0] == '-') {
1675 mod = -1;
1676 sizestr++;
1677 } else if (sizestr[0] == '+') {
1678 mod = 1;
1679 sizestr++;
1680 }
9a40f122
GH		 1681 new_size = memparse(sizestr, &retptr);
1682 if (*retptr != '\0' || new_size == 0) {
f46b5a66 1683 ret = -EINVAL;
c9e9f97b 1684 goto out_free;
f46b5a66
CH		 1685 }
1686 }
1687
401e29c1 1688 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
dfd79829 1689 ret = -EPERM;
63a212ab
SB		 1690 goto out_free;
1691 }
1692
7cc8e58d 1693 old_size = btrfs_device_get_total_bytes(device);
f46b5a66
CH		 1694
1695 if (mod < 0) {
1696 if (new_size > old_size) {
1697 ret = -EINVAL;
c9e9f97b 1698 goto out_free;
f46b5a66
CH		 1699 }
1700 new_size = old_size - new_size;
1701 } else if (mod > 0) {
eb8052e0 1702 if (new_size > ULLONG_MAX - old_size) {
902c68a4 1703 ret = -ERANGE;
eb8052e0
WF		 1704 goto out_free;
1705 }
f46b5a66
CH		 1706 new_size = old_size + new_size;
1707 }
1708
ee22184b 1709 if (new_size < SZ_256M) {
f46b5a66 1710 ret = -EINVAL;
c9e9f97b 1711 goto out_free;
f46b5a66
CH		 1712 }
1713 if (new_size > device->bdev->bd_inode->i_size) {
1714 ret = -EFBIG;
c9e9f97b 1715 goto out_free;
f46b5a66
CH		 1716 }
1717
47f08b96 1718 new_size = round_down(new_size, fs_info->sectorsize);
f46b5a66 1719
0b246afa
JM		 1720 btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
1721 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1722
1723 if (new_size > old_size) {
a22285a6 1724 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1725 if (IS_ERR(trans)) {
1726 ret = PTR_ERR(trans);
c9e9f97b 1727 goto out_free;
98d5dc13 1728 }
f46b5a66 1729 ret = btrfs_grow_device(trans, device, new_size);
3a45bb20 1730 btrfs_commit_transaction(trans);
ece7d20e 1731 } else if (new_size < old_size) {
f46b5a66 1732 ret = btrfs_shrink_device(device, new_size);
0253f40e 1733 } /* equal, nothing need to do */
f46b5a66 1734
c9e9f97b 1735out_free:
f46b5a66 1736 kfree(vol_args);
c9e9f97b 1737out:
171938e5 1738 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
18f39c41 1739 mnt_drop_write_file(file);
f46b5a66
CH		 1740 return ret;
1741}
1742
72fd032e 1743static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
52f75f4f 1744 const char *name, unsigned long fd, int subvol,
6f72c7e2 1745 u64 *transid, bool readonly,
8696c533 1746 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1747{
f46b5a66 1748 int namelen;
3de4586c 1749 int ret = 0;
f46b5a66 1750
325c50e3
JM		 1751 if (!S_ISDIR(file_inode(file)->i_mode))
1752 return -ENOTDIR;
1753
a874a63e
LB		 1754 ret = mnt_want_write_file(file);
1755 if (ret)
1756 goto out;
1757
72fd032e
SW		 1758 namelen = strlen(name);
1759 if (strchr(name, '/')) {
f46b5a66 1760 ret = -EINVAL;
a874a63e 1761 goto out_drop_write;
f46b5a66
CH		 1762 }
1763
16780cab
CM		 1764 if (name[0] == '.' &&
1765 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1766 ret = -EEXIST;
a874a63e 1767 goto out_drop_write;
16780cab
CM		 1768 }
1769
3de4586c 1770 if (subvol) {
72fd032e 1771 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1772 NULL, transid, readonly, inherit);
cb8e7090 1773 } else {
2903ff01 1774 struct fd src = fdget(fd);
3de4586c 1775 struct inode *src_inode;
2903ff01 1776 if (!src.file) {
3de4586c 1777 ret = -EINVAL;
a874a63e 1778 goto out_drop_write;
3de4586c
CM		 1779 }
1780
496ad9aa
AV		 1781 src_inode = file_inode(src.file);
1782 if (src_inode->i_sb != file_inode(file)->i_sb) {
c79b4713 1783 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
efe120a0 1784 "Snapshot src from another FS");
23ad5b17 1785 ret = -EXDEV;
d0242061
DS		 1786 } else if (!inode_owner_or_capable(src_inode)) {
1787 /*
1788 * Subvolume creation is not restricted, but snapshots
1789 * are limited to own subvolumes only
1790 */
1791 ret = -EPERM;
ecd18815
AV		 1792 } else {
1793 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1794 BTRFS_I(src_inode)->root,
1795 transid, readonly, inherit);
3de4586c 1796 }
2903ff01 1797 fdput(src);
cb8e7090 1798 }
a874a63e
LB		 1799out_drop_write:
1800 mnt_drop_write_file(file);
f46b5a66 1801out:
72fd032e
SW		 1802 return ret;
1803}
1804
1805static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1806 void __user *arg, int subvol)
72fd032e 1807{
fa0d2b9b 1808 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1809 int ret;
1810
325c50e3
JM		 1811 if (!S_ISDIR(file_inode(file)->i_mode))
1812 return -ENOTDIR;
1813
fa0d2b9b
LZ		 1814 vol_args = memdup_user(arg, sizeof(*vol_args));
1815 if (IS_ERR(vol_args))
1816 return PTR_ERR(vol_args);
1817 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1818
fa0d2b9b 1819 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1820 vol_args->fd, subvol,
6f72c7e2 1821 NULL, false, NULL);
fdfb1e4f 1822
fa0d2b9b
LZ		 1823 kfree(vol_args);
1824 return ret;
1825}
fdfb1e4f 1826
fa0d2b9b
LZ		 1827static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1828 void __user *arg, int subvol)
1829{
1830 struct btrfs_ioctl_vol_args_v2 *vol_args;
1831 int ret;
1832 u64 transid = 0;
1833 u64 *ptr = NULL;
b83cc969 1834 bool readonly = false;
6f72c7e2 1835 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1836
325c50e3
JM		 1837 if (!S_ISDIR(file_inode(file)->i_mode))
1838 return -ENOTDIR;
1839
fa0d2b9b
LZ		 1840 vol_args = memdup_user(arg, sizeof(*vol_args));
1841 if (IS_ERR(vol_args))
1842 return PTR_ERR(vol_args);
1843 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1844
b83cc969 1845 if (vol_args->flags &
6f72c7e2
AJ		 1846 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1847 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1848 ret = -EOPNOTSUPP;
c47ca32d 1849 goto free_args;
72fd032e 1850 }
fa0d2b9b
LZ		 1851
1852 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1853 ptr = &transid;
b83cc969
LZ		 1854 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1855 readonly = true;
6f72c7e2 1856 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
09cbfeaf 1857 if (vol_args->size > PAGE_SIZE) {
6f72c7e2 1858 ret = -EINVAL;
c47ca32d 1859 goto free_args;
6f72c7e2
AJ		 1860 }
1861 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1862 if (IS_ERR(inherit)) {
1863 ret = PTR_ERR(inherit);
c47ca32d 1864 goto free_args;
6f72c7e2
AJ		 1865 }
1866 }
fa0d2b9b
LZ		 1867
1868 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1869 vol_args->fd, subvol, ptr,
8696c533 1870 readonly, inherit);
c47ca32d
DC		 1871 if (ret)
1872 goto free_inherit;
fa0d2b9b 1873
c47ca32d
DC		 1874 if (ptr && copy_to_user(arg +
1875 offsetof(struct btrfs_ioctl_vol_args_v2,
1876 transid),
1877 ptr, sizeof(*ptr)))
fa0d2b9b 1878 ret = -EFAULT;
c47ca32d
DC		 1879
1880free_inherit:
6f72c7e2 1881 kfree(inherit);
c47ca32d
DC		 1882free_args:
1883 kfree(vol_args);
f46b5a66
CH		 1884 return ret;
1885}
1886
0caa102d
LZ		 1887static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1888 void __user *arg)
1889{
496ad9aa 1890 struct inode *inode = file_inode(file);
0b246afa 1891 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
0caa102d
LZ		 1892 struct btrfs_root *root = BTRFS_I(inode)->root;
1893 int ret = 0;
1894 u64 flags = 0;
1895
4a0cc7ca 1896 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1897 return -EINVAL;
1898
0b246afa 1899 down_read(&fs_info->subvol_sem);
0caa102d
LZ		 1900 if (btrfs_root_readonly(root))
1901 flags |= BTRFS_SUBVOL_RDONLY;
0b246afa 1902 up_read(&fs_info->subvol_sem);
0caa102d
LZ		 1903
1904 if (copy_to_user(arg, &flags, sizeof(flags)))
1905 ret = -EFAULT;
1906
1907 return ret;
1908}
1909
1910static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1911 void __user *arg)
1912{
496ad9aa 1913 struct inode *inode = file_inode(file);
0b246afa 1914 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
0caa102d
LZ		 1915 struct btrfs_root *root = BTRFS_I(inode)->root;
1916 struct btrfs_trans_handle *trans;
1917 u64 root_flags;
1918 u64 flags;
1919 int ret = 0;
1920
bd60ea0f
DS		 1921 if (!inode_owner_or_capable(inode))
1922 return -EPERM;
1923
b9ca0664
LB		 1924 ret = mnt_want_write_file(file);
1925 if (ret)
1926 goto out;
0caa102d 1927
4a0cc7ca 1928 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
b9ca0664
LB		 1929 ret = -EINVAL;
1930 goto out_drop_write;
1931 }
0caa102d 1932
b9ca0664
LB		 1933 if (copy_from_user(&flags, arg, sizeof(flags))) {
1934 ret = -EFAULT;
1935 goto out_drop_write;
1936 }
0caa102d 1937
b9ca0664
LB		 1938 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1939 ret = -EINVAL;
1940 goto out_drop_write;
1941 }
0caa102d 1942
b9ca0664
LB		 1943 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1944 ret = -EOPNOTSUPP;
1945 goto out_drop_write;
1946 }
0caa102d 1947
0b246afa 1948 down_write(&fs_info->subvol_sem);
0caa102d
LZ		 1949
1950 /* nothing to do */
1951 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1952 goto out_drop_sem;
0caa102d
LZ		 1953
1954 root_flags = btrfs_root_flags(&root->root_item);
2c686537 1955 if (flags & BTRFS_SUBVOL_RDONLY) {
0caa102d
LZ		 1956 btrfs_set_root_flags(&root->root_item,
1957 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1958 } else {
1959 /*
1960 * Block RO -> RW transition if this subvolume is involved in
1961 * send
1962 */
1963 spin_lock(&root->root_item_lock);
1964 if (root->send_in_progress == 0) {
1965 btrfs_set_root_flags(&root->root_item,
0caa102d 1966 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1967 spin_unlock(&root->root_item_lock);
1968 } else {
1969 spin_unlock(&root->root_item_lock);
0b246afa
JM		 1970 btrfs_warn(fs_info,
1971 "Attempt to set subvolume %llu read-write during send",
1972 root->root_key.objectid);
2c686537
DS		 1973 ret = -EPERM;
1974 goto out_drop_sem;
1975 }
1976 }
0caa102d
LZ		 1977
1978 trans = btrfs_start_transaction(root, 1);
1979 if (IS_ERR(trans)) {
1980 ret = PTR_ERR(trans);
1981 goto out_reset;
1982 }
1983
0b246afa 1984 ret = btrfs_update_root(trans, fs_info->tree_root,
0caa102d 1985 &root->root_key, &root->root_item);
9417ebc8
NB		 1986 if (ret < 0) {
1987 btrfs_end_transaction(trans);
1988 goto out_reset;
1989 }
1990
1991 ret = btrfs_commit_transaction(trans);
0caa102d 1992
0caa102d
LZ		 1993out_reset:
1994 if (ret)
1995 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1996out_drop_sem:
0b246afa 1997 up_write(&fs_info->subvol_sem);
b9ca0664
LB		 1998out_drop_write:
1999 mnt_drop_write_file(file);
2000out:
0caa102d
LZ		 2001 return ret;
2002}
2003
ac8e9819
CM		 2004static noinline int key_in_sk(struct btrfs_key *key,
2005 struct btrfs_ioctl_search_key *sk)
2006{
abc6e134
CM		 2007 struct btrfs_key test;
2008 int ret;
2009
2010 test.objectid = sk->min_objectid;
2011 test.type = sk->min_type;
2012 test.offset = sk->min_offset;
2013
2014 ret = btrfs_comp_cpu_keys(key, &test);
2015 if (ret < 0)
ac8e9819 2016 return 0;
abc6e134
CM		 2017
2018 test.objectid = sk->max_objectid;
2019 test.type = sk->max_type;
2020 test.offset = sk->max_offset;
2021
2022 ret = btrfs_comp_cpu_keys(key, &test);
2023 if (ret > 0)
ac8e9819
CM		 2024 return 0;
2025 return 1;
2026}
2027
df397565 2028static noinline int copy_to_sk(struct btrfs_path *path,
ac8e9819
CM		 2029 struct btrfs_key *key,
2030 struct btrfs_ioctl_search_key *sk,
9b6e817d 2031 size_t *buf_size,
ba346b35 2032 char __user *ubuf,
ac8e9819
CM		 2033 unsigned long *sk_offset,
2034 int *num_found)
2035{
2036 u64 found_transid;
2037 struct extent_buffer *leaf;
2038 struct btrfs_ioctl_search_header sh;
dd81d459 2039 struct btrfs_key test;
ac8e9819
CM		 2040 unsigned long item_off;
2041 unsigned long item_len;
2042 int nritems;
2043 int i;
2044 int slot;
ac8e9819
CM		 2045 int ret = 0;
2046
2047 leaf = path->nodes[0];
2048 slot = path->slots[0];
2049 nritems = btrfs_header_nritems(leaf);
2050
2051 if (btrfs_header_generation(leaf) > sk->max_transid) {
2052 i = nritems;
2053 goto advance_key;
2054 }
2055 found_transid = btrfs_header_generation(leaf);
2056
2057 for (i = slot; i < nritems; i++) {
2058 item_off = btrfs_item_ptr_offset(leaf, i);
2059 item_len = btrfs_item_size_nr(leaf, i);
2060
03b71c6c
GP		 2061 btrfs_item_key_to_cpu(leaf, key, i);
2062 if (!key_in_sk(key, sk))
2063 continue;
2064
9b6e817d 2065 if (sizeof(sh) + item_len > *buf_size) {
8f5f6178
GH		 2066 if (*num_found) {
2067 ret = 1;
2068 goto out;
2069 }
2070
2071 /*
2072 * return one empty item back for v1, which does not
2073 * handle -EOVERFLOW
2074 */
2075
9b6e817d 2076 *buf_size = sizeof(sh) + item_len;
ac8e9819 2077 item_len = 0;
8f5f6178
GH		 2078 ret = -EOVERFLOW;
2079 }
ac8e9819 2080
9b6e817d 2081 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
ac8e9819 2082 ret = 1;
25c9bc2e 2083 goto out;
ac8e9819
CM		 2084 }
2085
ac8e9819
CM		 2086 sh.objectid = key->objectid;
2087 sh.offset = key->offset;
2088 sh.type = key->type;
2089 sh.len = item_len;
2090 sh.transid = found_transid;
2091
2092 /* copy search result header */
ba346b35
GH		 2093 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2094 ret = -EFAULT;
2095 goto out;
2096 }
2097
ac8e9819
CM		 2098 *sk_offset += sizeof(sh);
2099
2100 if (item_len) {
ba346b35 2101 char __user *up = ubuf + *sk_offset;
ac8e9819 2102 /* copy the item */
ba346b35
GH		 2103 if (read_extent_buffer_to_user(leaf, up,
2104 item_off, item_len)) {
2105 ret = -EFAULT;
2106 goto out;
2107 }
2108
ac8e9819 2109 *sk_offset += item_len;
ac8e9819 2110 }
e2156867 2111 (*num_found)++;
ac8e9819 2112
8f5f6178
GH		 2113 if (ret) /* -EOVERFLOW from above */
2114 goto out;
2115
25c9bc2e
GH		 2116 if (*num_found >= sk->nr_items) {
2117 ret = 1;
2118 goto out;
2119 }
ac8e9819
CM		 2120 }
2121advance_key:
abc6e134 2122 ret = 0;
dd81d459
NA		 2123 test.objectid = sk->max_objectid;
2124 test.type = sk->max_type;
2125 test.offset = sk->max_offset;
2126 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2127 ret = 1;
2128 else if (key->offset < (u64)-1)
ac8e9819 2129 key->offset++;
dd81d459 2130 else if (key->type < (u8)-1) {
abc6e134 2131 key->offset = 0;
ac8e9819 2132 key->type++;
dd81d459 2133 } else if (key->objectid < (u64)-1) {
abc6e134
CM		 2134 key->offset = 0;
2135 key->type = 0;
ac8e9819 2136 key->objectid++;
abc6e134
CM		 2137 } else
2138 ret = 1;
25c9bc2e 2139out:
ba346b35
GH		 2140 /*
2141 * 0: all items from this leaf copied, continue with next
2142 * 1: * more items can be copied, but unused buffer is too small
2143 * * all items were found
2144 * Either way, it will stops the loop which iterates to the next
2145 * leaf
2146 * -EOVERFLOW: item was to large for buffer
2147 * -EFAULT: could not copy extent buffer back to userspace
2148 */
ac8e9819
CM		 2149 return ret;
2150}
2151
2152static noinline int search_ioctl(struct inode *inode,
12544442 2153 struct btrfs_ioctl_search_key *sk,
9b6e817d 2154 size_t *buf_size,
ba346b35 2155 char __user *ubuf)
ac8e9819 2156{
0b246afa 2157 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
ac8e9819
CM		 2158 struct btrfs_root *root;
2159 struct btrfs_key key;
ac8e9819 2160 struct btrfs_path *path;
ac8e9819
CM		 2161 int ret;
2162 int num_found = 0;
2163 unsigned long sk_offset = 0;
2164
9b6e817d
GH		 2165 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2166 *buf_size = sizeof(struct btrfs_ioctl_search_header);
12544442 2167 return -EOVERFLOW;
9b6e817d 2168 }
12544442 2169
ac8e9819
CM		 2170 path = btrfs_alloc_path();
2171 if (!path)
2172 return -ENOMEM;
2173
2174 if (sk->tree_id == 0) {
2175 /* search the root of the inode that was passed */
2176 root = BTRFS_I(inode)->root;
2177 } else {
2178 key.objectid = sk->tree_id;
2179 key.type = BTRFS_ROOT_ITEM_KEY;
2180 key.offset = (u64)-1;
2181 root = btrfs_read_fs_root_no_name(info, &key);
2182 if (IS_ERR(root)) {
ac8e9819 2183 btrfs_free_path(path);
ad1e3d56 2184 return PTR_ERR(root);
ac8e9819
CM		 2185 }
2186 }
2187
2188 key.objectid = sk->min_objectid;
2189 key.type = sk->min_type;
2190 key.offset = sk->min_offset;
2191
67871254 2192 while (1) {
6174d3cb 2193 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
ac8e9819
CM		 2194 if (ret != 0) {
2195 if (ret > 0)
2196 ret = 0;
2197 goto err;
2198 }
df397565 2199 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
ac8e9819 2200 &sk_offset, &num_found);
b3b4aa74 2201 btrfs_release_path(path);
25c9bc2e 2202 if (ret)
ac8e9819
CM		 2203 break;
2204
2205 }
8f5f6178
GH		 2206 if (ret > 0)
2207 ret = 0;
ac8e9819
CM		 2208err:
2209 sk->nr_items = num_found;
2210 btrfs_free_path(path);
2211 return ret;
2212}
2213
2214static noinline int btrfs_ioctl_tree_search(struct file *file,
2215 void __user *argp)
2216{
ba346b35
GH		 2217 struct btrfs_ioctl_search_args __user *uargs;
2218 struct btrfs_ioctl_search_key sk;
9b6e817d
GH		 2219 struct inode *inode;
2220 int ret;
2221 size_t buf_size;
ac8e9819
CM		 2222
2223 if (!capable(CAP_SYS_ADMIN))
2224 return -EPERM;
2225
ba346b35
GH		 2226 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2227
2228 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2229 return -EFAULT;
ac8e9819 2230
ba346b35 2231 buf_size = sizeof(uargs->buf);
ac8e9819 2232
496ad9aa 2233 inode = file_inode(file);
ba346b35 2234 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
8f5f6178
GH		 2235
2236 /*
2237 * In the origin implementation an overflow is handled by returning a
2238 * search header with a len of zero, so reset ret.
2239 */
2240 if (ret == -EOVERFLOW)
2241 ret = 0;
2242
ba346b35 2243 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
ac8e9819 2244 ret = -EFAULT;
ac8e9819
CM		 2245 return ret;
2246}
2247
cc68a8a5
GH		 2248static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2249 void __user *argp)
2250{
2251 struct btrfs_ioctl_search_args_v2 __user *uarg;
2252 struct btrfs_ioctl_search_args_v2 args;
2253 struct inode *inode;
2254 int ret;
2255 size_t buf_size;
ee22184b 2256 const size_t buf_limit = SZ_16M;
cc68a8a5
GH		 2257
2258 if (!capable(CAP_SYS_ADMIN))
2259 return -EPERM;
2260
2261 /* copy search header and buffer size */
2262 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2263 if (copy_from_user(&args, uarg, sizeof(args)))
2264 return -EFAULT;
2265
2266 buf_size = args.buf_size;
2267
cc68a8a5
GH		 2268 /* limit result size to 16MB */
2269 if (buf_size > buf_limit)
2270 buf_size = buf_limit;
2271
2272 inode = file_inode(file);
2273 ret = search_ioctl(inode, &args.key, &buf_size,
718dc5fa 2274 (char __user *)(&uarg->buf[0]));
cc68a8a5
GH		 2275 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2276 ret = -EFAULT;
2277 else if (ret == -EOVERFLOW &&
2278 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2279 ret = -EFAULT;
2280
ac8e9819
CM		 2281 return ret;
2282}
2283
98d377a0 2284/*
ac8e9819
CM		 2285 * Search INODE_REFs to identify path name of 'dirid' directory
2286 * in a 'tree_id' tree. and sets path name to 'name'.
2287 */
98d377a0
TH		 2288static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2289 u64 tree_id, u64 dirid, char *name)
2290{
2291 struct btrfs_root *root;
2292 struct btrfs_key key;
ac8e9819 2293 char *ptr;
98d377a0
TH		 2294 int ret = -1;
2295 int slot;
2296 int len;
2297 int total_len = 0;
2298 struct btrfs_inode_ref *iref;
2299 struct extent_buffer *l;
2300 struct btrfs_path *path;
2301
2302 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2303 name[0]='\0';
2304 return 0;
2305 }
2306
2307 path = btrfs_alloc_path();
2308 if (!path)
2309 return -ENOMEM;
2310
c8bcbfbd 2311 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
98d377a0
TH		 2312
2313 key.objectid = tree_id;
2314 key.type = BTRFS_ROOT_ITEM_KEY;
2315 key.offset = (u64)-1;
2316 root = btrfs_read_fs_root_no_name(info, &key);
2317 if (IS_ERR(root)) {
ad1e3d56 2318 ret = PTR_ERR(root);
8ad6fcab 2319 goto out;
98d377a0
TH		 2320 }
2321
2322 key.objectid = dirid;
2323 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2324 key.offset = (u64)-1;
98d377a0 2325
67871254 2326 while (1) {
98d377a0
TH		 2327 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2328 if (ret < 0)
2329 goto out;
18674c6c
FDBM		 2330 else if (ret > 0) {
2331 ret = btrfs_previous_item(root, path, dirid,
2332 BTRFS_INODE_REF_KEY);
2333 if (ret < 0)
2334 goto out;
2335 else if (ret > 0) {
2336 ret = -ENOENT;
2337 goto out;
2338 }
2339 }
98d377a0
TH		 2340
2341 l = path->nodes[0];
2342 slot = path->slots[0];
2343 btrfs_item_key_to_cpu(l, &key, slot);
2344
98d377a0
TH		 2345 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2346 len = btrfs_inode_ref_name_len(l, iref);
2347 ptr -= len + 1;
2348 total_len += len + 1;
a696cf35
FDBM		 2349 if (ptr < name) {
2350 ret = -ENAMETOOLONG;
98d377a0 2351 goto out;
a696cf35 2352 }
98d377a0
TH		 2353
2354 *(ptr + len) = '/';
67871254 2355 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
98d377a0
TH		 2356
2357 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2358 break;
2359
b3b4aa74 2360 btrfs_release_path(path);
98d377a0 2361 key.objectid = key.offset;
8ad6fcab 2362 key.offset = (u64)-1;
98d377a0 2363 dirid = key.objectid;
98d377a0 2364 }
77906a50 2365 memmove(name, ptr, total_len);
67871254 2366 name[total_len] = '\0';
98d377a0
TH		 2367 ret = 0;
2368out:
2369 btrfs_free_path(path);
ac8e9819
CM		 2370 return ret;
2371}
2372
23d0b79d
TM		 2373static int btrfs_search_path_in_tree_user(struct inode *inode,
2374 struct btrfs_ioctl_ino_lookup_user_args *args)
2375{
2376 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2377 struct super_block *sb = inode->i_sb;
2378 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2379 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2380 u64 dirid = args->dirid;
2381 unsigned long item_off;
2382 unsigned long item_len;
2383 struct btrfs_inode_ref *iref;
2384 struct btrfs_root_ref *rref;
2385 struct btrfs_root *root;
2386 struct btrfs_path *path;
2387 struct btrfs_key key, key2;
2388 struct extent_buffer *leaf;
2389 struct inode *temp_inode;
2390 char *ptr;
2391 int slot;
2392 int len;
2393 int total_len = 0;
2394 int ret;
2395
2396 path = btrfs_alloc_path();
2397 if (!path)
2398 return -ENOMEM;
2399
2400 /*
2401 * If the bottom subvolume does not exist directly under upper_limit,
2402 * construct the path in from the bottom up.
2403 */
2404 if (dirid != upper_limit.objectid) {
2405 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2406
2407 key.objectid = treeid;
2408 key.type = BTRFS_ROOT_ITEM_KEY;
2409 key.offset = (u64)-1;
2410 root = btrfs_read_fs_root_no_name(fs_info, &key);
2411 if (IS_ERR(root)) {
2412 ret = PTR_ERR(root);
2413 goto out;
2414 }
2415
2416 key.objectid = dirid;
2417 key.type = BTRFS_INODE_REF_KEY;
2418 key.offset = (u64)-1;
2419 while (1) {
2420 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2421 if (ret < 0) {
2422 goto out;
2423 } else if (ret > 0) {
2424 ret = btrfs_previous_item(root, path, dirid,
2425 BTRFS_INODE_REF_KEY);
2426 if (ret < 0) {
2427 goto out;
2428 } else if (ret > 0) {
2429 ret = -ENOENT;
2430 goto out;
2431 }
2432 }
2433
2434 leaf = path->nodes[0];
2435 slot = path->slots[0];
2436 btrfs_item_key_to_cpu(leaf, &key, slot);
2437
2438 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2439 len = btrfs_inode_ref_name_len(leaf, iref);
2440 ptr -= len + 1;
2441 total_len += len + 1;
2442 if (ptr < args->path) {
2443 ret = -ENAMETOOLONG;
2444 goto out;
2445 }
2446
2447 *(ptr + len) = '/';
2448 read_extent_buffer(leaf, ptr,
2449 (unsigned long)(iref + 1), len);
2450
2451 /* Check the read+exec permission of this directory */
2452 ret = btrfs_previous_item(root, path, dirid,
2453 BTRFS_INODE_ITEM_KEY);
2454 if (ret < 0) {
2455 goto out;
2456 } else if (ret > 0) {
2457 ret = -ENOENT;
2458 goto out;
2459 }
2460
2461 leaf = path->nodes[0];
2462 slot = path->slots[0];
2463 btrfs_item_key_to_cpu(leaf, &key2, slot);
2464 if (key2.objectid != dirid) {
2465 ret = -ENOENT;
2466 goto out;
2467 }
2468
2469 temp_inode = btrfs_iget(sb, &key2, root, NULL);
3ca57bd6
MT		 2470 if (IS_ERR(temp_inode)) {
2471 ret = PTR_ERR(temp_inode);
2472 goto out;
2473 }
23d0b79d
TM		 2474 ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
2475 iput(temp_inode);
2476 if (ret) {
2477 ret = -EACCES;
2478 goto out;
2479 }
2480
2481 if (key.offset == upper_limit.objectid)
2482 break;
2483 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2484 ret = -EACCES;
2485 goto out;
2486 }
2487
2488 btrfs_release_path(path);
2489 key.objectid = key.offset;
2490 key.offset = (u64)-1;
2491 dirid = key.objectid;
2492 }
2493
2494 memmove(args->path, ptr, total_len);
2495 args->path[total_len] = '\0';
2496 btrfs_release_path(path);
2497 }
2498
2499 /* Get the bottom subvolume's name from ROOT_REF */
2500 root = fs_info->tree_root;
2501 key.objectid = treeid;
2502 key.type = BTRFS_ROOT_REF_KEY;
2503 key.offset = args->treeid;
2504 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2505 if (ret < 0) {
2506 goto out;
2507 } else if (ret > 0) {
2508 ret = -ENOENT;
2509 goto out;
2510 }
2511
2512 leaf = path->nodes[0];
2513 slot = path->slots[0];
2514 btrfs_item_key_to_cpu(leaf, &key, slot);
2515
2516 item_off = btrfs_item_ptr_offset(leaf, slot);
2517 item_len = btrfs_item_size_nr(leaf, slot);
2518 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2519 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2520 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2521 ret = -EINVAL;
2522 goto out;
2523 }
2524
2525 /* Copy subvolume's name */
2526 item_off += sizeof(struct btrfs_root_ref);
2527 item_len -= sizeof(struct btrfs_root_ref);
2528 read_extent_buffer(leaf, args->name, item_off, item_len);
2529 args->name[item_len] = 0;
2530
2531out:
2532 btrfs_free_path(path);
2533 return ret;
2534}
2535
ac8e9819
CM		 2536static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2537 void __user *argp)
2538{
bece2e82
BVA		 2539 struct btrfs_ioctl_ino_lookup_args *args;
2540 struct inode *inode;
01b810b8 2541 int ret = 0;
ac8e9819 2542
2354d08f
JL		 2543 args = memdup_user(argp, sizeof(*args));
2544 if (IS_ERR(args))
2545 return PTR_ERR(args);
c2b96929 2546
496ad9aa 2547 inode = file_inode(file);
ac8e9819 2548
01b810b8
DS		 2549 /*
2550 * Unprivileged query to obtain the containing subvolume root id. The
2551 * path is reset so it's consistent with btrfs_search_path_in_tree.
2552 */
1b53ac4d
CM		 2553 if (args->treeid == 0)
2554 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2555
01b810b8
DS		 2556 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2557 args->name[0] = 0;
2558 goto out;
2559 }
2560
2561 if (!capable(CAP_SYS_ADMIN)) {
2562 ret = -EPERM;
2563 goto out;
2564 }
2565
ac8e9819
CM		 2566 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2567 args->treeid, args->objectid,
2568 args->name);
2569
01b810b8 2570out:
ac8e9819
CM		 2571 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2572 ret = -EFAULT;
2573
2574 kfree(args);
98d377a0
TH		 2575 return ret;
2576}
2577
23d0b79d
TM		 2578/*
2579 * Version of ino_lookup ioctl (unprivileged)
2580 *
2581 * The main differences from ino_lookup ioctl are:
2582 *
2583 * 1. Read + Exec permission will be checked using inode_permission() during
2584 * path construction. -EACCES will be returned in case of failure.
2585 * 2. Path construction will be stopped at the inode number which corresponds
2586 * to the fd with which this ioctl is called. If constructed path does not
2587 * exist under fd's inode, -EACCES will be returned.
2588 * 3. The name of bottom subvolume is also searched and filled.
2589 */
2590static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2591{
2592 struct btrfs_ioctl_ino_lookup_user_args *args;
2593 struct inode *inode;
2594 int ret;
2595
2596 args = memdup_user(argp, sizeof(*args));
2597 if (IS_ERR(args))
2598 return PTR_ERR(args);
2599
2600 inode = file_inode(file);
2601
2602 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2603 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2604 /*
2605 * The subvolume does not exist under fd with which this is
2606 * called
2607 */
2608 kfree(args);
2609 return -EACCES;
2610 }
2611
2612 ret = btrfs_search_path_in_tree_user(inode, args);
2613
2614 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2615 ret = -EFAULT;
2616
2617 kfree(args);
2618 return ret;
2619}
2620
b64ec075
TM		 2621/* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2622static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2623{
2624 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2625 struct btrfs_fs_info *fs_info;
2626 struct btrfs_root *root;
2627 struct btrfs_path *path;
2628 struct btrfs_key key;
2629 struct btrfs_root_item *root_item;
2630 struct btrfs_root_ref *rref;
2631 struct extent_buffer *leaf;
2632 unsigned long item_off;
2633 unsigned long item_len;
2634 struct inode *inode;
2635 int slot;
2636 int ret = 0;
2637
2638 path = btrfs_alloc_path();
2639 if (!path)
2640 return -ENOMEM;
2641
2642 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2643 if (!subvol_info) {
2644 btrfs_free_path(path);
2645 return -ENOMEM;
2646 }
2647
2648 inode = file_inode(file);
2649 fs_info = BTRFS_I(inode)->root->fs_info;
2650
2651 /* Get root_item of inode's subvolume */
2652 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2653 key.type = BTRFS_ROOT_ITEM_KEY;
2654 key.offset = (u64)-1;
2655 root = btrfs_read_fs_root_no_name(fs_info, &key);
2656 if (IS_ERR(root)) {
2657 ret = PTR_ERR(root);
2658 goto out;
2659 }
2660 root_item = &root->root_item;
2661
2662 subvol_info->treeid = key.objectid;
2663
2664 subvol_info->generation = btrfs_root_generation(root_item);
2665 subvol_info->flags = btrfs_root_flags(root_item);
2666
2667 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2668 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2669 BTRFS_UUID_SIZE);
2670 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2671 BTRFS_UUID_SIZE);
2672
2673 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2674 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2675 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2676
2677 subvol_info->otransid = btrfs_root_otransid(root_item);
2678 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2679 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2680
2681 subvol_info->stransid = btrfs_root_stransid(root_item);
2682 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2683 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2684
2685 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2686 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2687 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2688
2689 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2690 /* Search root tree for ROOT_BACKREF of this subvolume */
2691 root = fs_info->tree_root;
2692
2693 key.type = BTRFS_ROOT_BACKREF_KEY;
2694 key.offset = 0;
2695 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2696 if (ret < 0) {
2697 goto out;
2698 } else if (path->slots[0] >=
2699 btrfs_header_nritems(path->nodes[0])) {
2700 ret = btrfs_next_leaf(root, path);
2701 if (ret < 0) {
2702 goto out;
2703 } else if (ret > 0) {
2704 ret = -EUCLEAN;
2705 goto out;
2706 }
2707 }
2708
2709 leaf = path->nodes[0];
2710 slot = path->slots[0];
2711 btrfs_item_key_to_cpu(leaf, &key, slot);
2712 if (key.objectid == subvol_info->treeid &&
2713 key.type == BTRFS_ROOT_BACKREF_KEY) {
2714 subvol_info->parent_id = key.offset;
2715
2716 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2717 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2718
2719 item_off = btrfs_item_ptr_offset(leaf, slot)
2720 + sizeof(struct btrfs_root_ref);
2721 item_len = btrfs_item_size_nr(leaf, slot)
2722 - sizeof(struct btrfs_root_ref);
2723 read_extent_buffer(leaf, subvol_info->name,
2724 item_off, item_len);
2725 } else {
2726 ret = -ENOENT;
2727 goto out;
2728 }
2729 }
2730
2731 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2732 ret = -EFAULT;
2733
2734out:
2735 btrfs_free_path(path);
2736 kzfree(subvol_info);
2737 return ret;
2738}
2739
42e4b520
TM		 2740/*
2741 * Return ROOT_REF information of the subvolume containing this inode
2742 * except the subvolume name.
2743 */
2744static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2745{
2746 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2747 struct btrfs_root_ref *rref;
2748 struct btrfs_root *root;
2749 struct btrfs_path *path;
2750 struct btrfs_key key;
2751 struct extent_buffer *leaf;
2752 struct inode *inode;
2753 u64 objectid;
2754 int slot;
2755 int ret;
2756 u8 found;
2757
2758 path = btrfs_alloc_path();
2759 if (!path)
2760 return -ENOMEM;
2761
2762 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2763 if (IS_ERR(rootrefs)) {
2764 btrfs_free_path(path);
2765 return PTR_ERR(rootrefs);
2766 }
2767
2768 inode = file_inode(file);
2769 root = BTRFS_I(inode)->root->fs_info->tree_root;
2770 objectid = BTRFS_I(inode)->root->root_key.objectid;
2771
2772 key.objectid = objectid;
2773 key.type = BTRFS_ROOT_REF_KEY;
2774 key.offset = rootrefs->min_treeid;
2775 found = 0;
2776
2777 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2778 if (ret < 0) {
2779 goto out;
2780 } else if (path->slots[0] >=
2781 btrfs_header_nritems(path->nodes[0])) {
2782 ret = btrfs_next_leaf(root, path);
2783 if (ret < 0) {
2784 goto out;
2785 } else if (ret > 0) {
2786 ret = -EUCLEAN;
2787 goto out;
2788 }
2789 }
2790 while (1) {
2791 leaf = path->nodes[0];
2792 slot = path->slots[0];
2793
2794 btrfs_item_key_to_cpu(leaf, &key, slot);
2795 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2796 ret = 0;
2797 goto out;
2798 }
2799
2800 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2801 ret = -EOVERFLOW;
2802 goto out;
2803 }
2804
2805 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2806 rootrefs->rootref[found].treeid = key.offset;
2807 rootrefs->rootref[found].dirid =
2808 btrfs_root_ref_dirid(leaf, rref);
2809 found++;
2810
2811 ret = btrfs_next_item(root, path);
2812 if (ret < 0) {
2813 goto out;
2814 } else if (ret > 0) {
2815 ret = -EUCLEAN;
2816 goto out;
2817 }
2818 }
2819
2820out:
2821 if (!ret || ret == -EOVERFLOW) {
2822 rootrefs->num_items = found;
2823 /* update min_treeid for next search */
2824 if (found)
2825 rootrefs->min_treeid =
2826 rootrefs->rootref[found - 1].treeid + 1;
2827 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2828 ret = -EFAULT;
2829 }
2830
2831 kfree(rootrefs);
2832 btrfs_free_path(path);
2833
2834 return ret;
2835}
2836
76dda93c
YZ		 2837static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2838 void __user *arg)
2839{
54563d41 2840 struct dentry *parent = file->f_path.dentry;
0b246afa 2841 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
76dda93c 2842 struct dentry *dentry;
2b0143b5 2843 struct inode *dir = d_inode(parent);
76dda93c
YZ		 2844 struct inode *inode;
2845 struct btrfs_root *root = BTRFS_I(dir)->root;
2846 struct btrfs_root *dest = NULL;
2847 struct btrfs_ioctl_vol_args *vol_args;
76dda93c 2848 int namelen;
76dda93c
YZ		 2849 int err = 0;
2850
325c50e3
JM		 2851 if (!S_ISDIR(dir->i_mode))
2852 return -ENOTDIR;
2853
76dda93c
YZ		 2854 vol_args = memdup_user(arg, sizeof(*vol_args));
2855 if (IS_ERR(vol_args))
2856 return PTR_ERR(vol_args);
2857
2858 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2859 namelen = strlen(vol_args->name);
2860 if (strchr(vol_args->name, '/') ||
2861 strncmp(vol_args->name, "..", namelen) == 0) {
2862 err = -EINVAL;
2863 goto out;
2864 }
2865
a561be71 2866 err = mnt_want_write_file(file);
76dda93c
YZ		 2867 if (err)
2868 goto out;
2869
521e0546 2870
00235411
AV		 2871 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2872 if (err == -EINTR)
2873 goto out_drop_write;
76dda93c
YZ		 2874 dentry = lookup_one_len(vol_args->name, parent, namelen);
2875 if (IS_ERR(dentry)) {
2876 err = PTR_ERR(dentry);
2877 goto out_unlock_dir;
2878 }
2879
2b0143b5 2880 if (d_really_is_negative(dentry)) {
76dda93c
YZ		 2881 err = -ENOENT;
2882 goto out_dput;
2883 }
2884
2b0143b5 2885 inode = d_inode(dentry);
4260f7c7 2886 dest = BTRFS_I(inode)->root;
67871254 2887 if (!capable(CAP_SYS_ADMIN)) {
4260f7c7
SW		 2888 /*
2889 * Regular user. Only allow this with a special mount
2890 * option, when the user has write+exec access to the
2891 * subvol root, and when rmdir(2) would have been
2892 * allowed.
2893 *
2894 * Note that this is _not_ check that the subvol is
2895 * empty or doesn't contain data that we wouldn't
2896 * otherwise be able to delete.
2897 *
2898 * Users who want to delete empty subvols should try
2899 * rmdir(2).
2900 */
2901 err = -EPERM;
0b246afa 2902 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
4260f7c7
SW		 2903 goto out_dput;
2904
2905 /*
2906 * Do not allow deletion if the parent dir is the same
2907 * as the dir to be deleted. That means the ioctl
2908 * must be called on the dentry referencing the root
2909 * of the subvol, not a random directory contained
2910 * within it.
2911 */
2912 err = -EINVAL;
2913 if (root == dest)
2914 goto out_dput;
2915
2916 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2917 if (err)
2918 goto out_dput;
4260f7c7
SW		 2919 }
2920
5c39da5b
MX		 2921 /* check if subvolume may be deleted by a user */
2922 err = btrfs_may_delete(dir, dentry, 1);
2923 if (err)
2924 goto out_dput;
2925
4a0cc7ca 2926 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2927 err = -EINVAL;
2928 goto out_dput;
2929 }
2930
5955102c 2931 inode_lock(inode);
f60a2364 2932 err = btrfs_delete_subvolume(dir, dentry);
5955102c 2933 inode_unlock(inode);
f60a2364 2934 if (!err)
76dda93c 2935 d_delete(dentry);
fa6ac876 2936
76dda93c
YZ		 2937out_dput:
2938 dput(dentry);
2939out_unlock_dir:
5955102c 2940 inode_unlock(dir);
00235411 2941out_drop_write:
2a79f17e 2942 mnt_drop_write_file(file);
76dda93c
YZ		 2943out:
2944 kfree(vol_args);
2945 return err;
2946}
2947
1e701a32 2948static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2949{
496ad9aa 2950 struct inode *inode = file_inode(file);
f46b5a66 2951 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2952 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2953 int ret;
2954
25122d15
ID		 2955 ret = mnt_want_write_file(file);
2956 if (ret)
2957 return ret;
b83cc969 2958
25122d15
ID		 2959 if (btrfs_root_readonly(root)) {
2960 ret = -EROFS;
2961 goto out;
5ac00add 2962 }
f46b5a66
CH		 2963
2964 switch (inode->i_mode & S_IFMT) {
2965 case S_IFDIR:
e441d54d
CM		 2966 if (!capable(CAP_SYS_ADMIN)) {
2967 ret = -EPERM;
2968 goto out;
2969 }
de78b51a 2970 ret = btrfs_defrag_root(root);
f46b5a66
CH		 2971 break;
2972 case S_IFREG:
616d374e
AB		 2973 /*
2974 * Note that this does not check the file descriptor for write
2975 * access. This prevents defragmenting executables that are
2976 * running and allows defrag on files open in read-only mode.
2977 */
2978 if (!capable(CAP_SYS_ADMIN) &&
2979 inode_permission(inode, MAY_WRITE)) {
2980 ret = -EPERM;
e441d54d
CM		 2981 goto out;
2982 }
1e701a32
CM		 2983
2984 range = kzalloc(sizeof(*range), GFP_KERNEL);
2985 if (!range) {
2986 ret = -ENOMEM;
2987 goto out;
2988 }
2989
2990 if (argp) {
2991 if (copy_from_user(range, argp,
2992 sizeof(*range))) {
2993 ret = -EFAULT;
2994 kfree(range);
683be16e 2995 goto out;
1e701a32
CM		 2996 }
2997 /* compression requires us to start the IO */
2998 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2999 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
3000 range->extent_thresh = (u32)-1;
3001 }
3002 } else {
3003 /* the rest are all set to zero by kzalloc */
3004 range->len = (u64)-1;
3005 }
496ad9aa 3006 ret = btrfs_defrag_file(file_inode(file), file,
7c829b72 3007 range, BTRFS_OLDEST_GENERATION, 0);
4cb5300b
CM		 3008 if (ret > 0)
3009 ret = 0;
1e701a32 3010 kfree(range);
f46b5a66 3011 break;
8929ecfa
YZ		 3012 default:
3013 ret = -EINVAL;
f46b5a66 3014 }
e441d54d 3015out:
25122d15 3016 mnt_drop_write_file(file);
e441d54d 3017 return ret;
f46b5a66
CH		 3018}
3019
2ff7e61e 3020static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
f46b5a66
CH		 3021{
3022 struct btrfs_ioctl_vol_args *vol_args;
3023 int ret;
3024
e441d54d
CM		 3025 if (!capable(CAP_SYS_ADMIN))
3026 return -EPERM;
3027
171938e5 3028 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags))
e57138b3 3029 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b 3030
dae7b665 3031 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 3032 if (IS_ERR(vol_args)) {
3033 ret = PTR_ERR(vol_args);
3034 goto out;
3035 }
f46b5a66 3036
5516e595 3037 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2ff7e61e 3038 ret = btrfs_init_new_device(fs_info, vol_args->name);
f46b5a66 3039
43d20761 3040 if (!ret)
0b246afa 3041 btrfs_info(fs_info, "disk added %s", vol_args->name);
43d20761 3042
f46b5a66 3043 kfree(vol_args);
c9e9f97b 3044out:
171938e5 3045 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
f46b5a66
CH		 3046 return ret;
3047}
3048
6b526ed7 3049static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
f46b5a66 3050{
0b246afa
JM		 3051 struct inode *inode = file_inode(file);
3052 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
6b526ed7 3053 struct btrfs_ioctl_vol_args_v2 *vol_args;
f46b5a66
CH		 3054 int ret;
3055
e441d54d
CM		 3056 if (!capable(CAP_SYS_ADMIN))
3057 return -EPERM;
3058
da24927b
MX		 3059 ret = mnt_want_write_file(file);
3060 if (ret)
3061 return ret;
c146afad 3062
dae7b665 3063 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 3064 if (IS_ERR(vol_args)) {
3065 ret = PTR_ERR(vol_args);
c47ca32d 3066 goto err_drop;
c9e9f97b 3067 }
f46b5a66 3068
6b526ed7 3069 /* Check for compatibility reject unknown flags */
fd4e994b
OS		 3070 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
3071 ret = -EOPNOTSUPP;
3072 goto out;
3073 }
f46b5a66 3074
171938e5 3075 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
183860f6
AJ		 3076 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3077 goto out;
3078 }
3079
735654ea 3080 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2ff7e61e 3081 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
6b526ed7
AJ		 3082 } else {
3083 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
2ff7e61e 3084 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
6b526ed7 3085 }
171938e5 3086 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
183860f6 3087
6b526ed7 3088 if (!ret) {
735654ea 3089 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
0b246afa 3090 btrfs_info(fs_info, "device deleted: id %llu",
6b526ed7
AJ		 3091 vol_args->devid);
3092 else
0b246afa 3093 btrfs_info(fs_info, "device deleted: %s",
6b526ed7
AJ		 3094 vol_args->name);
3095 }
183860f6
AJ		 3096out:
3097 kfree(vol_args);
c47ca32d 3098err_drop:
4ac20c70 3099 mnt_drop_write_file(file);
f46b5a66
CH		 3100 return ret;
3101}
3102
da24927b 3103static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 3104{
0b246afa
JM		 3105 struct inode *inode = file_inode(file);
3106 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f46b5a66
CH		 3107 struct btrfs_ioctl_vol_args *vol_args;
3108 int ret;
3109
e441d54d
CM		 3110 if (!capable(CAP_SYS_ADMIN))
3111 return -EPERM;
3112
da24927b
MX		 3113 ret = mnt_want_write_file(file);
3114 if (ret)
3115 return ret;
c146afad 3116
171938e5 3117 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
183860f6 3118 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
58d7bbf8
DS		 3119 goto out_drop_write;
3120 }
3121
3122 vol_args = memdup_user(arg, sizeof(*vol_args));
3123 if (IS_ERR(vol_args)) {
3124 ret = PTR_ERR(vol_args);
183860f6
AJ		 3125 goto out;
3126 }
3127
58d7bbf8 3128 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2ff7e61e 3129 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
183860f6 3130
ec95d491 3131 if (!ret)
0b246afa 3132 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
183860f6 3133 kfree(vol_args);
58d7bbf8 3134out:
171938e5 3135 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
58d7bbf8 3136out_drop_write:
4ac20c70 3137 mnt_drop_write_file(file);
58d7bbf8 3138
f46b5a66
CH		 3139 return ret;
3140}
3141
2ff7e61e
JM		 3142static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3143 void __user *arg)
475f6387 3144{
027ed2f0 3145 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387 3146 struct btrfs_device *device;
0b246afa 3147 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
027ed2f0 3148 int ret = 0;
475f6387 3149
027ed2f0
LZ		 3150 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
3151 if (!fi_args)
3152 return -ENOMEM;
3153
d03262c7 3154 rcu_read_lock();
027ed2f0 3155 fi_args->num_devices = fs_devices->num_devices;
475f6387 3156
d03262c7 3157 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 3158 if (device->devid > fi_args->max_id)
3159 fi_args->max_id = device->devid;
475f6387 3160 }
d03262c7 3161 rcu_read_unlock();
475f6387 3162
de37aa51 3163 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
bea7eafd
OS		 3164 fi_args->nodesize = fs_info->nodesize;
3165 fi_args->sectorsize = fs_info->sectorsize;
3166 fi_args->clone_alignment = fs_info->sectorsize;
80a773fb 3167
027ed2f0
LZ		 3168 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3169 ret = -EFAULT;
475f6387 3170
027ed2f0
LZ		 3171 kfree(fi_args);
3172 return ret;
475f6387
JS		 3173}
3174
2ff7e61e
JM		 3175static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3176 void __user *arg)
475f6387
JS		 3177{
3178 struct btrfs_ioctl_dev_info_args *di_args;
3179 struct btrfs_device *dev;
475f6387
JS		 3180 int ret = 0;
3181 char *s_uuid = NULL;
475f6387 3182
475f6387
JS		 3183 di_args = memdup_user(arg, sizeof(*di_args));
3184 if (IS_ERR(di_args))
3185 return PTR_ERR(di_args);
3186
dd5f9615 3187 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 3188 s_uuid = di_args->uuid;
3189
c5593ca3 3190 rcu_read_lock();
e4319cd9 3191 dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid,
09ba3bc9 3192 NULL, true);
475f6387
JS		 3193
3194 if (!dev) {
3195 ret = -ENODEV;
3196 goto out;
3197 }
3198
3199 di_args->devid = dev->devid;
7cc8e58d
MX		 3200 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3201 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
475f6387 3202 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 3203 if (dev->name) {
672d5990
MT		 3204 strncpy(di_args->path, rcu_str_deref(dev->name),
3205 sizeof(di_args->path) - 1);
a27202fb
JM		 3206 di_args->path[sizeof(di_args->path) - 1] = 0;
3207 } else {
99ba55ad 3208 di_args->path[0] = '\0';
a27202fb 3209 }
475f6387
JS		 3210
3211out:
c5593ca3 3212 rcu_read_unlock();
475f6387
JS		 3213 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3214 ret = -EFAULT;
3215
3216 kfree(di_args);
3217 return ret;
3218}
3219
d8b55242
FM		 3220static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
3221 struct inode *inode2, u64 loff2, u64 len)
3222{
3223 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3224 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3225}
3226
3227static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
3228 struct inode *inode2, u64 loff2, u64 len)
3229{
3230 if (inode1 < inode2) {
3231 swap(inode1, inode2);
3232 swap(loff1, loff2);
3233 } else if (inode1 == inode2 && loff2 < loff1) {
3234 swap(loff1, loff2);
3235 }
3236 lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3237 lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3238}
3239
57a50e25 3240static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,
34a28e3d 3241 struct inode *dst, u64 dst_loff)
416161db
MF		 3242{
3243 int ret;
f4414602 3244
34a28e3d 3245 /*
d8b55242
FM		 3246 * Lock destination range to serialize with concurrent readpages() and
3247 * source range to serialize with relocation.
34a28e3d 3248 */
d8b55242 3249 btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
57a50e25 3250 ret = btrfs_clone(src, dst, loff, len, len, dst_loff, 1);
d8b55242 3251 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3973909d
TT		 3252
3253 return ret;
3254}
3255
b6728768
TT		 3256#define BTRFS_MAX_DEDUPE_LEN SZ_16M
3257
3973909d
TT		 3258static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3259 struct inode *dst, u64 dst_loff)
3260{
3261 int ret;
b6728768 3262 u64 i, tail_len, chunk_count;
3973909d 3263
b6728768
TT		 3264 tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
3265 chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
67b07bd4 3266
b6728768
TT		 3267 for (i = 0; i < chunk_count; i++) {
3268 ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
34a28e3d 3269 dst, dst_loff);
b6728768 3270 if (ret)
34a28e3d 3271 return ret;
b6728768
TT		 3272
3273 loff += BTRFS_MAX_DEDUPE_LEN;
3274 dst_loff += BTRFS_MAX_DEDUPE_LEN;
3275 }
3276
3277 if (tail_len > 0)
67b07bd4 3278 ret = btrfs_extent_same_range(src, loff, tail_len, dst,
34a28e3d 3279 dst_loff);
416161db
MF		 3280
3281 return ret;
3282}
3283
f82a9901
FM		 3284static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3285 struct inode *inode,
3286 u64 endoff,
3287 const u64 destoff,
1c919a5e
MF		 3288 const u64 olen,
3289 int no_time_update)
f82a9901
FM		 3290{
3291 struct btrfs_root *root = BTRFS_I(inode)->root;
3292 int ret;
3293
3294 inode_inc_iversion(inode);
1c919a5e 3295 if (!no_time_update)
c2050a45 3296 inode->i_mtime = inode->i_ctime = current_time(inode);
f82a9901
FM		 3297 /*
3298 * We round up to the block size at eof when determining which
3299 * extents to clone above, but shouldn't round up the file size.
3300 */
3301 if (endoff > destoff + olen)
3302 endoff = destoff + olen;
3303 if (endoff > inode->i_size)
6ef06d27 3304 btrfs_i_size_write(BTRFS_I(inode), endoff);
f82a9901
FM		 3305
3306 ret = btrfs_update_inode(trans, root, inode);
3307 if (ret) {
66642832 3308 btrfs_abort_transaction(trans, ret);
3a45bb20 3309 btrfs_end_transaction(trans);
f82a9901
FM		 3310 goto out;
3311 }
3a45bb20 3312 ret = btrfs_end_transaction(trans);
f82a9901
FM		 3313out:
3314 return ret;
3315}
3316
a2f392e4 3317static void clone_update_extent_map(struct btrfs_inode *inode,
7ffbb598
FM		 3318 const struct btrfs_trans_handle *trans,
3319 const struct btrfs_path *path,
7ffbb598
FM		 3320 const u64 hole_offset,
3321 const u64 hole_len)
3322{
a2f392e4 3323 struct extent_map_tree *em_tree = &inode->extent_tree;
7ffbb598
FM		 3324 struct extent_map *em;
3325 int ret;
3326
3327 em = alloc_extent_map();
3328 if (!em) {
a2f392e4 3329 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
7ffbb598
FM		 3330 return;
3331 }
3332
14f59796
FM		 3333 if (path) {
3334 struct btrfs_file_extent_item *fi;
3335
3336 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3337 struct btrfs_file_extent_item);
a2f392e4 3338 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
7ffbb598
FM		 3339 em->generation = -1;
3340 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3341 BTRFS_FILE_EXTENT_INLINE)
3342 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
a2f392e4 3343 &inode->runtime_flags);
7ffbb598
FM		 3344 } else {
3345 em->start = hole_offset;
3346 em->len = hole_len;
3347 em->ram_bytes = em->len;
3348 em->orig_start = hole_offset;
3349 em->block_start = EXTENT_MAP_HOLE;
3350 em->block_len = 0;
3351 em->orig_block_len = 0;
3352 em->compress_type = BTRFS_COMPRESS_NONE;
3353 em->generation = trans->transid;
3354 }
3355
3356 while (1) {
3357 write_lock(&em_tree->lock);
3358 ret = add_extent_mapping(em_tree, em, 1);
3359 write_unlock(&em_tree->lock);
3360 if (ret != -EEXIST) {
3361 free_extent_map(em);
3362 break;
3363 }
a2f392e4 3364 btrfs_drop_extent_cache(inode, em->start,
7ffbb598
FM		 3365 em->start + em->len - 1, 0);
3366 }
3367
ee39b432 3368 if (ret)
a2f392e4 3369 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags);
7ffbb598
FM		 3370}
3371
8039d87d
FM		 3372/*
3373 * Make sure we do not end up inserting an inline extent into a file that has
3374 * already other (non-inline) extents. If a file has an inline extent it can
3375 * not have any other extents and the (single) inline extent must start at the
3376 * file offset 0. Failing to respect these rules will lead to file corruption,
3377 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3378 *
3379 * We can have extents that have been already written to disk or we can have
3380 * dirty ranges still in delalloc, in which case the extent maps and items are
3381 * created only when we run delalloc, and the delalloc ranges might fall outside
3382 * the range we are currently locking in the inode's io tree. So we check the
3383 * inode's i_size because of that (i_size updates are done while holding the
3384 * i_mutex, which we are holding here).
3385 * We also check to see if the inode has a size not greater than "datal" but has
3386 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3387 * protected against such concurrent fallocate calls by the i_mutex).
3388 *
3389 * If the file has no extents but a size greater than datal, do not allow the
3390 * copy because we would need turn the inline extent into a non-inline one (even
3391 * with NO_HOLES enabled). If we find our destination inode only has one inline
3392 * extent, just overwrite it with the source inline extent if its size is less
3393 * than the source extent's size, or we could copy the source inline extent's
3394 * data into the destination inode's inline extent if the later is greater then
3395 * the former.
3396 */
4a0ab9d7 3397static int clone_copy_inline_extent(struct inode *dst,
8039d87d
FM		 3398 struct btrfs_trans_handle *trans,
3399 struct btrfs_path *path,
3400 struct btrfs_key *new_key,
3401 const u64 drop_start,
3402 const u64 datal,
3403 const u64 skip,
3404 const u64 size,
3405 char *inline_data)
3406{
0b246afa 3407 struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
8039d87d
FM		 3408 struct btrfs_root *root = BTRFS_I(dst)->root;
3409 const u64 aligned_end = ALIGN(new_key->offset + datal,
0b246afa 3410 fs_info->sectorsize);
8039d87d
FM		 3411 int ret;
3412 struct btrfs_key key;
3413
3414 if (new_key->offset > 0)
3415 return -EOPNOTSUPP;
3416
4a0cc7ca 3417 key.objectid = btrfs_ino(BTRFS_I(dst));
8039d87d
FM		 3418 key.type = BTRFS_EXTENT_DATA_KEY;
3419 key.offset = 0;
3420 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3421 if (ret < 0) {
3422 return ret;
3423 } else if (ret > 0) {
3424 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3425 ret = btrfs_next_leaf(root, path);
3426 if (ret < 0)
3427 return ret;
3428 else if (ret > 0)
3429 goto copy_inline_extent;
3430 }
3431 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
4a0cc7ca 3432 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
8039d87d
FM		 3433 key.type == BTRFS_EXTENT_DATA_KEY) {
3434 ASSERT(key.offset > 0);
3435 return -EOPNOTSUPP;
3436 }
3437 } else if (i_size_read(dst) <= datal) {
3438 struct btrfs_file_extent_item *ei;
3439 u64 ext_len;
3440
3441 /*
3442 * If the file size is <= datal, make sure there are no other
3443 * extents following (can happen do to an fallocate call with
3444 * the flag FALLOC_FL_KEEP_SIZE).
3445 */
3446 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3447 struct btrfs_file_extent_item);
3448 /*
3449 * If it's an inline extent, it can not have other extents
3450 * following it.
3451 */
3452 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3453 BTRFS_FILE_EXTENT_INLINE)
3454 goto copy_inline_extent;
3455
3456 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3457 if (ext_len > aligned_end)
3458 return -EOPNOTSUPP;
3459
3460 ret = btrfs_next_item(root, path);
3461 if (ret < 0) {
3462 return ret;
3463 } else if (ret == 0) {
3464 btrfs_item_key_to_cpu(path->nodes[0], &key,
3465 path->slots[0]);
4a0cc7ca 3466 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
8039d87d
FM		 3467 key.type == BTRFS_EXTENT_DATA_KEY)
3468 return -EOPNOTSUPP;
3469 }
3470 }
3471
3472copy_inline_extent:
3473 /*
3474 * We have no extent items, or we have an extent at offset 0 which may
3475 * or may not be inlined. All these cases are dealt the same way.
3476 */
3477 if (i_size_read(dst) > datal) {
3478 /*
3479 * If the destination inode has an inline extent...
3480 * This would require copying the data from the source inline
3481 * extent into the beginning of the destination's inline extent.
3482 * But this is really complex, both extents can be compressed
3483 * or just one of them, which would require decompressing and
3484 * re-compressing data (which could increase the new compressed
3485 * size, not allowing the compressed data to fit anymore in an
3486 * inline extent).
3487 * So just don't support this case for now (it should be rare,
3488 * we are not really saving space when cloning inline extents).
3489 */
3490 return -EOPNOTSUPP;
3491 }
3492
3493 btrfs_release_path(path);
3494 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3495 if (ret)
3496 return ret;
3497 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3498 if (ret)
3499 return ret;
3500
3501 if (skip) {
3502 const u32 start = btrfs_file_extent_calc_inline_size(0);
3503
3504 memmove(inline_data + start, inline_data + start + skip, datal);
3505 }
3506
3507 write_extent_buffer(path->nodes[0], inline_data,
3508 btrfs_item_ptr_offset(path->nodes[0],
3509 path->slots[0]),
3510 size);
3511 inode_add_bytes(dst, datal);
3512
3513 return 0;
3514}
3515
32b7c687
MF		 3516/**
3517 * btrfs_clone() - clone a range from inode file to another
3518 *
3519 * @src: Inode to clone from
3520 * @inode: Inode to clone to
3521 * @off: Offset within source to start clone from
3522 * @olen: Original length, passed by user, of range to clone
1c919a5e 3523 * @olen_aligned: Block-aligned value of olen
32b7c687 3524 * @destoff: Offset within @inode to start clone
1c919a5e 3525 * @no_time_update: Whether to update mtime/ctime on the target inode
32b7c687
MF		 3526 */
3527static int btrfs_clone(struct inode *src, struct inode *inode,
f82a9901 3528 const u64 off, const u64 olen, const u64 olen_aligned,
1c919a5e 3529 const u64 destoff, int no_time_update)
f46b5a66 3530{
0b246afa 3531 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f46b5a66 3532 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 3533 struct btrfs_path *path = NULL;
f46b5a66 3534 struct extent_buffer *leaf;
32b7c687
MF		 3535 struct btrfs_trans_handle *trans;
3536 char *buf = NULL;
ae01a0ab 3537 struct btrfs_key key;
f46b5a66
CH		 3538 u32 nritems;
3539 int slot;
ae01a0ab 3540 int ret;
f82a9901 3541 const u64 len = olen_aligned;
f82a9901 3542 u64 last_dest_end = destoff;
ae01a0ab
YZ		 3543
3544 ret = -ENOMEM;
752ade68
MH		 3545 buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
3546 if (!buf)
3547 return ret;
ae01a0ab
YZ		 3548
3549 path = btrfs_alloc_path();
3550 if (!path) {
15351955 3551 kvfree(buf);
32b7c687 3552 return ret;
d525e8ab
LZ		 3553 }
3554
e4058b54 3555 path->reada = READA_FORWARD;
c5c9cd4d 3556 /* clone data */
4a0cc7ca 3557 key.objectid = btrfs_ino(BTRFS_I(src));
ae01a0ab 3558 key.type = BTRFS_EXTENT_DATA_KEY;
2c463823 3559 key.offset = off;
f46b5a66
CH		 3560
3561 while (1) {
de249e66 3562 u64 next_key_min_offset = key.offset + 1;
df858e76 3563
f46b5a66
CH		 3564 /*
3565 * note the key will change type as we walk through the
3566 * tree.
3567 */
e4355f34 3568 path->leave_spinning = 1;
362a20c5
DS		 3569 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3570 0, 0);
f46b5a66
CH		 3571 if (ret < 0)
3572 goto out;
2c463823
FM		 3573 /*
3574 * First search, if no extent item that starts at offset off was
3575 * found but the previous item is an extent item, it's possible
3576 * it might overlap our target range, therefore process it.
3577 */
3578 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3579 btrfs_item_key_to_cpu(path->nodes[0], &key,
3580 path->slots[0] - 1);
3581 if (key.type == BTRFS_EXTENT_DATA_KEY)
3582 path->slots[0]--;
3583 }
f46b5a66 3584
ae01a0ab 3585 nritems = btrfs_header_nritems(path->nodes[0]);
e4355f34 3586process_slot:
ae01a0ab 3587 if (path->slots[0] >= nritems) {
362a20c5 3588 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 3589 if (ret < 0)
3590 goto out;
3591 if (ret > 0)
3592 break;
ae01a0ab 3593 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 3594 }
3595 leaf = path->nodes[0];
3596 slot = path->slots[0];
f46b5a66 3597
ae01a0ab 3598 btrfs_item_key_to_cpu(leaf, &key, slot);
962a298f 3599 if (key.type > BTRFS_EXTENT_DATA_KEY ||
4a0cc7ca 3600 key.objectid != btrfs_ino(BTRFS_I(src)))
f46b5a66
CH		 3601 break;
3602
962a298f 3603 if (key.type == BTRFS_EXTENT_DATA_KEY) {
c5c9cd4d
SW		 3604 struct btrfs_file_extent_item *extent;
3605 int type;
31840ae1
ZY		 3606 u32 size;
3607 struct btrfs_key new_key;
c5c9cd4d
SW		 3608 u64 disko = 0, diskl = 0;
3609 u64 datao = 0, datal = 0;
3610 u8 comp;
f82a9901 3611 u64 drop_start;
31840ae1 3612
c5c9cd4d
SW		 3613 extent = btrfs_item_ptr(leaf, slot,
3614 struct btrfs_file_extent_item);
3615 comp = btrfs_file_extent_compression(leaf, extent);
3616 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 3617 if (type == BTRFS_FILE_EXTENT_REG ||
3618 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 3619 disko = btrfs_file_extent_disk_bytenr(leaf,
3620 extent);
3621 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3622 extent);
c5c9cd4d 3623 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 3624 datal = btrfs_file_extent_num_bytes(leaf,
3625 extent);
c5c9cd4d
SW		 3626 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3627 /* take upper bound, may be compressed */
3628 datal = btrfs_file_extent_ram_bytes(leaf,
3629 extent);
3630 }
31840ae1 3631
2c463823
FM		 3632 /*
3633 * The first search might have left us at an extent
3634 * item that ends before our target range's start, can
3635 * happen if we have holes and NO_HOLES feature enabled.
3636 */
3637 if (key.offset + datal <= off) {
e4355f34
FDBM		 3638 path->slots[0]++;
3639 goto process_slot;
2c463823
FM		 3640 } else if (key.offset >= off + len) {
3641 break;
e4355f34 3642 }
df858e76 3643 next_key_min_offset = key.offset + datal;
e4355f34
FDBM		 3644 size = btrfs_item_size_nr(leaf, slot);
3645 read_extent_buffer(leaf, buf,
3646 btrfs_item_ptr_offset(leaf, slot),
3647 size);
3648
3649 btrfs_release_path(path);
3650 path->leave_spinning = 0;
c5c9cd4d 3651
31840ae1 3652 memcpy(&new_key, &key, sizeof(new_key));
4a0cc7ca 3653 new_key.objectid = btrfs_ino(BTRFS_I(inode));
4d728ec7
LZ		 3654 if (off <= key.offset)
3655 new_key.offset = key.offset + destoff - off;
3656 else
3657 new_key.offset = destoff;
31840ae1 3658
f82a9901
FM		 3659 /*
3660 * Deal with a hole that doesn't have an extent item
3661 * that represents it (NO_HOLES feature enabled).
3662 * This hole is either in the middle of the cloning
3663 * range or at the beginning (fully overlaps it or
3664 * partially overlaps it).
3665 */
3666 if (new_key.offset != last_dest_end)
3667 drop_start = last_dest_end;
3668 else
3669 drop_start = new_key.offset;
3670
b6f3409b
SW		 3671 /*
3672 * 1 - adjusting old extent (we may have to split it)
3673 * 1 - add new extent
3674 * 1 - inode update
3675 */
3676 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 3677 if (IS_ERR(trans)) {
3678 ret = PTR_ERR(trans);
3679 goto out;
3680 }
3681
c8a894d7
CM		 3682 if (type == BTRFS_FILE_EXTENT_REG ||
3683 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 3684 /*
3685 * a | --- range to clone ---| b
3686 * | ------------- extent ------------- |
3687 */
3688
93915584 3689 /* subtract range b */
d72c0842
LZ		 3690 if (key.offset + datal > off + len)
3691 datal = off + len - key.offset;
3692
93915584 3693 /* subtract range a */
a22285a6
YZ		 3694 if (off > key.offset) {
3695 datao += off - key.offset;
3696 datal -= off - key.offset;
3697 }
3698
5dc562c5 3699 ret = btrfs_drop_extents(trans, root, inode,
f82a9901 3700 drop_start,
a22285a6 3701 new_key.offset + datal,
2671485d 3702 1);
79787eaa 3703 if (ret) {
3f9e3df8 3704 if (ret != -EOPNOTSUPP)
00fdf13a 3705 btrfs_abort_transaction(trans,
66642832 3706 ret);
3a45bb20 3707 btrfs_end_transaction(trans);
79787eaa
JM		 3708 goto out;
3709 }
a22285a6 3710
c5c9cd4d
SW		 3711 ret = btrfs_insert_empty_item(trans, root, path,
3712 &new_key, size);
79787eaa 3713 if (ret) {
66642832 3714 btrfs_abort_transaction(trans, ret);
3a45bb20 3715 btrfs_end_transaction(trans);
79787eaa
JM		 3716 goto out;
3717 }
c5c9cd4d
SW		 3718
3719 leaf = path->nodes[0];
3720 slot = path->slots[0];
3721 write_extent_buffer(leaf, buf,
31840ae1
ZY		 3722 btrfs_item_ptr_offset(leaf, slot),
3723 size);
ae01a0ab 3724
c5c9cd4d 3725 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 3726 struct btrfs_file_extent_item);
c5c9cd4d 3727
c5c9cd4d
SW		 3728 /* disko == 0 means it's a hole */
3729 if (!disko)
3730 datao = 0;
c5c9cd4d
SW		 3731
3732 btrfs_set_file_extent_offset(leaf, extent,
3733 datao);
3734 btrfs_set_file_extent_num_bytes(leaf, extent,
3735 datal);
fcebe456 3736
c5c9cd4d
SW		 3737 if (disko) {
3738 inode_add_bytes(inode, datal);
2ff7e61e 3739 ret = btrfs_inc_extent_ref(trans,
84f7d8e6 3740 root,
5d4f98a2
YZ		 3741 disko, diskl, 0,
3742 root->root_key.objectid,
4a0cc7ca 3743 btrfs_ino(BTRFS_I(inode)),
b06c4bf5 3744 new_key.offset - datao);
79787eaa
JM		 3745 if (ret) {
3746 btrfs_abort_transaction(trans,
79787eaa 3747 ret);
3a45bb20 3748 btrfs_end_transaction(trans);
79787eaa
JM		 3749 goto out;
3750
3751 }
f46b5a66 3752 }
c5c9cd4d
SW		 3753 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3754 u64 skip = 0;
3755 u64 trim = 0;
ed958762 3756
c5c9cd4d
SW		 3757 if (off > key.offset) {
3758 skip = off - key.offset;
3759 new_key.offset += skip;
3760 }
d397712b 3761
aa42ffd9
LB		 3762 if (key.offset + datal > off + len)
3763 trim = key.offset + datal - (off + len);
d397712b 3764
c5c9cd4d 3765 if (comp && (skip || trim)) {
c5c9cd4d 3766 ret = -EINVAL;
3a45bb20 3767 btrfs_end_transaction(trans);
c5c9cd4d
SW		 3768 goto out;
3769 }
3770 size -= skip + trim;
3771 datal -= skip + trim;
a22285a6 3772
4a0ab9d7 3773 ret = clone_copy_inline_extent(inode,
8039d87d
FM		 3774 trans, path,
3775 &new_key,
3776 drop_start,
3777 datal,
3778 skip, size, buf);
79787eaa 3779 if (ret) {
3f9e3df8 3780 if (ret != -EOPNOTSUPP)
3a29bc09 3781 btrfs_abort_transaction(trans,
8039d87d 3782 ret);
3a45bb20 3783 btrfs_end_transaction(trans);
79787eaa
JM		 3784 goto out;
3785 }
c5c9cd4d
SW		 3786 leaf = path->nodes[0];
3787 slot = path->slots[0];
f46b5a66 3788 }
c5c9cd4d 3789
7ffbb598
FM		 3790 /* If we have an implicit hole (NO_HOLES feature). */
3791 if (drop_start < new_key.offset)
a2f392e4 3792 clone_update_extent_map(BTRFS_I(inode), trans,
14f59796 3793 NULL, drop_start,
7ffbb598
FM		 3794 new_key.offset - drop_start);
3795
a2f392e4
NB		 3796 clone_update_extent_map(BTRFS_I(inode), trans,
3797 path, 0, 0);
7ffbb598 3798
c5c9cd4d 3799 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 3800 btrfs_release_path(path);
c5c9cd4d 3801
62e2390e 3802 last_dest_end = ALIGN(new_key.offset + datal,
0b246afa 3803 fs_info->sectorsize);
f82a9901
FM		 3804 ret = clone_finish_inode_update(trans, inode,
3805 last_dest_end,
1c919a5e
MF		 3806 destoff, olen,
3807 no_time_update);
f82a9901 3808 if (ret)
79787eaa 3809 goto out;
2c463823
FM		 3810 if (new_key.offset + datal >= destoff + len)
3811 break;
a22285a6 3812 }
b3b4aa74 3813 btrfs_release_path(path);
df858e76 3814 key.offset = next_key_min_offset;
69ae5e44
WX		 3815
3816 if (fatal_signal_pending(current)) {
3817 ret = -EINTR;
3818 goto out;
3819 }
f46b5a66 3820 }
f46b5a66 3821 ret = 0;
32b7c687 3822
f82a9901
FM		 3823 if (last_dest_end < destoff + len) {
3824 /*
3825 * We have an implicit hole (NO_HOLES feature is enabled) that
3826 * fully or partially overlaps our cloning range at its end.
3827 */
3828 btrfs_release_path(path);
3829
3830 /*
3831 * 1 - remove extent(s)
3832 * 1 - inode update
3833 */
3834 trans = btrfs_start_transaction(root, 2);
3835 if (IS_ERR(trans)) {
3836 ret = PTR_ERR(trans);
3837 goto out;
3838 }
3839 ret = btrfs_drop_extents(trans, root, inode,
3840 last_dest_end, destoff + len, 1);
3841 if (ret) {
3842 if (ret != -EOPNOTSUPP)
66642832 3843 btrfs_abort_transaction(trans, ret);
3a45bb20 3844 btrfs_end_transaction(trans);
f82a9901
FM		 3845 goto out;
3846 }
a2f392e4
NB		 3847 clone_update_extent_map(BTRFS_I(inode), trans, NULL,
3848 last_dest_end,
3849 destoff + len - last_dest_end);
f82a9901 3850 ret = clone_finish_inode_update(trans, inode, destoff + len,
1c919a5e 3851 destoff, olen, no_time_update);
f82a9901
FM		 3852 }
3853
f46b5a66 3854out:
32b7c687 3855 btrfs_free_path(path);
15351955 3856 kvfree(buf);
32b7c687
MF		 3857 return ret;
3858}
3859
3db11b2e
ZB		 3860static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3861 u64 off, u64 olen, u64 destoff)
32b7c687 3862{
54563d41 3863 struct inode *inode = file_inode(file);
3db11b2e 3864 struct inode *src = file_inode(file_src);
0b246afa 3865 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
32b7c687
MF		 3866 int ret;
3867 u64 len = olen;
0b246afa 3868 u64 bs = fs_info->sb->s_blocksize;
32b7c687
MF		 3869
3870 /*
3871 * TODO:
3872 * - split compressed inline extents. annoying: we need to
3873 * decompress into destination's address_space (the file offset
3874 * may change, so source mapping won't do), then recompress (or
3875 * otherwise reinsert) a subrange.
00fdf13a
LB		 3876 *
3877 * - split destination inode's inline extents. The inline extents can
3878 * be either compressed or non-compressed.
32b7c687
MF		 3879 */
3880
ac765f83 3881 /*
34a28e3d
FM		 3882 * VFS's generic_remap_file_range_prep() protects us from cloning the
3883 * eof block into the middle of a file, which would result in corruption
3884 * if the file size is not blocksize aligned. So we don't need to check
3885 * for that case here.
ac765f83 3886 */
34a28e3d 3887 if (off + len == src->i_size)
32b7c687 3888 len = ALIGN(src->i_size, bs) - off;
32b7c687
MF		 3889
3890 if (destoff > inode->i_size) {
f7fa1107
FM		 3891 const u64 wb_start = ALIGN_DOWN(inode->i_size, bs);
3892
32b7c687
MF		 3893 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3894 if (ret)
34a28e3d 3895 return ret;
f7fa1107
FM		 3896 /*
3897 * We may have truncated the last block if the inode's size is
3898 * not sector size aligned, so we need to wait for writeback to
3899 * complete before proceeding further, otherwise we can race
3900 * with cloning and attempt to increment a reference to an
3901 * extent that no longer exists (writeback completed right after
3902 * we found the previous extent covering eof and before we
3903 * attempted to increment its reference count).
3904 */
3905 ret = btrfs_wait_ordered_range(inode, wb_start,
3906 destoff - wb_start);
3907 if (ret)
3908 return ret;
32b7c687
MF		 3909 }
3910
c125b8bf 3911 /*
d8b55242
FM		 3912 * Lock destination range to serialize with concurrent readpages() and
3913 * source range to serialize with relocation.
c125b8bf 3914 */
d8b55242 3915 btrfs_double_extent_lock(src, off, inode, destoff, len);
1c919a5e 3916 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
d8b55242 3917 btrfs_double_extent_unlock(src, off, inode, destoff, len);
c125b8bf
FM		 3918 /*
3919 * Truncate page cache pages so that future reads will see the cloned
3920 * data immediately and not the previous data.
3921 */
65bfa658 3922 truncate_inode_pages_range(&inode->i_data,
09cbfeaf
KS		 3923 round_down(destoff, PAGE_SIZE),
3924 round_up(destoff + len, PAGE_SIZE) - 1);
34a28e3d
FM		 3925
3926 return ret;
3927}
3928
3929static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
3930 struct file *file_out, loff_t pos_out,
3931 loff_t *len, unsigned int remap_flags)
3932{
3933 struct inode *inode_in = file_inode(file_in);
3934 struct inode *inode_out = file_inode(file_out);
3935 u64 bs = BTRFS_I(inode_out)->root->fs_info->sb->s_blocksize;
3936 bool same_inode = inode_out == inode_in;
3937 u64 wb_len;
3938 int ret;
3939
3940 if (!(remap_flags & REMAP_FILE_DEDUP)) {
3941 struct btrfs_root *root_out = BTRFS_I(inode_out)->root;
3942
3943 if (btrfs_root_readonly(root_out))
3944 return -EROFS;
3945
3946 if (file_in->f_path.mnt != file_out->f_path.mnt ||
3947 inode_in->i_sb != inode_out->i_sb)
3948 return -EXDEV;
3949 }
3950
3951 if (same_inode)
3952 inode_lock(inode_in);
3953 else
4ea748e1 3954 lock_two_nondirectories(inode_in, inode_out);
34a28e3d 3955
500710d3
FM		 3956 /* don't make the dst file partly checksummed */
3957 if ((BTRFS_I(inode_in)->flags & BTRFS_INODE_NODATASUM) !=
3958 (BTRFS_I(inode_out)->flags & BTRFS_INODE_NODATASUM)) {
3959 ret = -EINVAL;
3960 goto out_unlock;
3961 }
3962
34a28e3d
FM		 3963 /*
3964 * Now that the inodes are locked, we need to start writeback ourselves
3965 * and can not rely on the writeback from the VFS's generic helper
3966 * generic_remap_file_range_prep() because:
3967 *
3968 * 1) For compression we must call filemap_fdatawrite_range() range
3969 * twice (btrfs_fdatawrite_range() does it for us), and the generic
3970 * helper only calls it once;
3971 *
3972 * 2) filemap_fdatawrite_range(), called by the generic helper only
3973 * waits for the writeback to complete, i.e. for IO to be done, and
3974 * not for the ordered extents to complete. We need to wait for them
3975 * to complete so that new file extent items are in the fs tree.
3976 */
3977 if (*len == 0 && !(remap_flags & REMAP_FILE_DEDUP))
3978 wb_len = ALIGN(inode_in->i_size, bs) - ALIGN_DOWN(pos_in, bs);
3979 else
3980 wb_len = ALIGN(*len, bs);
3981
3982 /*
3983 * Since we don't lock ranges, wait for ongoing lockless dio writes (as
3984 * any in progress could create its ordered extents after we wait for
3985 * existing ordered extents below).
3986 */
3987 inode_dio_wait(inode_in);
293a8489 3988 if (!same_inode)
34a28e3d
FM		 3989 inode_dio_wait(inode_out);
3990
3991 ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs),
3992 wb_len);
3993 if (ret < 0)
3994 goto out_unlock;
3995 ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs),
3996 wb_len);
3997 if (ret < 0)
3998 goto out_unlock;
3999
4000 ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
4001 len, remap_flags);
4002 if (ret < 0 || *len == 0)
4003 goto out_unlock;
4004
4005 return 0;
4006
4007 out_unlock:
4008 if (same_inode)
4009 inode_unlock(inode_in);
293a8489 4010 else
4ea748e1 4011 unlock_two_nondirectories(inode_in, inode_out);
34a28e3d 4012
3db11b2e
ZB		 4013 return ret;
4014}
4015
42ec3d4c
DW		 4016loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
4017 struct file *dst_file, loff_t destoff, loff_t len,
2e5dfc99 4018 unsigned int remap_flags)
3db11b2e 4019{
34a28e3d
FM		 4020 struct inode *src_inode = file_inode(src_file);
4021 struct inode *dst_inode = file_inode(dst_file);
4022 bool same_inode = dst_inode == src_inode;
42ec3d4c
DW		 4023 int ret;
4024
2e5dfc99
DW		 4025 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
4026 return -EINVAL;
4027
34a28e3d
FM		 4028 ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff,
4029 &len, remap_flags);
4030 if (ret < 0 || len == 0)
4031 return ret;
2e5dfc99 4032
34a28e3d
FM		 4033 if (remap_flags & REMAP_FILE_DEDUP)
4034 ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff);
4035 else
42ec3d4c 4036 ret = btrfs_clone_files(dst_file, src_file, off, len, destoff);
34a28e3d
FM		 4037
4038 if (same_inode)
4039 inode_unlock(src_inode);
4040 else
4ea748e1 4041 unlock_two_nondirectories(src_inode, dst_inode);
34a28e3d 4042
42ec3d4c 4043 return ret < 0 ? ret : len;
c5c9cd4d
SW		 4044}
4045
6ef5ed0d
JB		 4046static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
4047{
496ad9aa 4048 struct inode *inode = file_inode(file);
0b246afa 4049 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
6ef5ed0d
JB		 4050 struct btrfs_root *root = BTRFS_I(inode)->root;
4051 struct btrfs_root *new_root;
4052 struct btrfs_dir_item *di;
4053 struct btrfs_trans_handle *trans;
4054 struct btrfs_path *path;
4055 struct btrfs_key location;
4056 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 4057 u64 objectid = 0;
4058 u64 dir_id;
3c04ce01 4059 int ret;
6ef5ed0d
JB		 4060
4061 if (!capable(CAP_SYS_ADMIN))
4062 return -EPERM;
4063
3c04ce01
MX		 4064 ret = mnt_want_write_file(file);
4065 if (ret)
4066 return ret;
4067
4068 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
4069 ret = -EFAULT;
4070 goto out;
4071 }
6ef5ed0d
JB		 4072
4073 if (!objectid)
1cecf579 4074 objectid = BTRFS_FS_TREE_OBJECTID;
6ef5ed0d
JB		 4075
4076 location.objectid = objectid;
4077 location.type = BTRFS_ROOT_ITEM_KEY;
4078 location.offset = (u64)-1;
4079
0b246afa 4080 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
3c04ce01
MX		 4081 if (IS_ERR(new_root)) {
4082 ret = PTR_ERR(new_root);
4083 goto out;
4084 }
4fd786e6 4085 if (!is_fstree(new_root->root_key.objectid)) {
6d6d2829 4086 ret = -ENOENT;
4087 goto out;
4088 }
6ef5ed0d 4089
6ef5ed0d 4090 path = btrfs_alloc_path();
3c04ce01
MX		 4091 if (!path) {
4092 ret = -ENOMEM;
4093 goto out;
4094 }
6ef5ed0d
JB		 4095 path->leave_spinning = 1;
4096
4097 trans = btrfs_start_transaction(root, 1);
98d5dc13 4098 if (IS_ERR(trans)) {
6ef5ed0d 4099 btrfs_free_path(path);
3c04ce01
MX		 4100 ret = PTR_ERR(trans);
4101 goto out;
6ef5ed0d
JB		 4102 }
4103
0b246afa
JM		 4104 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4105 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
6ef5ed0d 4106 dir_id, "default", 7, 1);
cf1e99a4 4107 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d 4108 btrfs_free_path(path);
3a45bb20 4109 btrfs_end_transaction(trans);
0b246afa 4110 btrfs_err(fs_info,
5d163e0e 4111 "Umm, you don't have the default diritem, this isn't going to work");
3c04ce01
MX		 4112 ret = -ENOENT;
4113 goto out;
6ef5ed0d
JB		 4114 }
4115
4116 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4117 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4118 btrfs_mark_buffer_dirty(path->nodes[0]);
4119 btrfs_free_path(path);
4120
0b246afa 4121 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3a45bb20 4122 btrfs_end_transaction(trans);
3c04ce01
MX		 4123out:
4124 mnt_drop_write_file(file);
4125 return ret;
6ef5ed0d
JB		 4126}
4127
c065f5b1
SY		 4128static void get_block_group_info(struct list_head *groups_list,
4129 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 4130{
4131 struct btrfs_block_group_cache *block_group;
4132
4133 space->total_bytes = 0;
4134 space->used_bytes = 0;
4135 space->flags = 0;
4136 list_for_each_entry(block_group, groups_list, list) {
4137 space->flags = block_group->flags;
4138 space->total_bytes += block_group->key.offset;
4139 space->used_bytes +=
4140 btrfs_block_group_used(&block_group->item);
4141 }
4142}
4143
2ff7e61e
JM		 4144static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
4145 void __user *arg)
1406e432
JB		 4146{
4147 struct btrfs_ioctl_space_args space_args;
4148 struct btrfs_ioctl_space_info space;
4149 struct btrfs_ioctl_space_info *dest;
7fde62bf 4150 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 4151 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 4152 struct btrfs_space_info *info;
315d8e98
CIK		 4153 static const u64 types[] = {
4154 BTRFS_BLOCK_GROUP_DATA,
4155 BTRFS_BLOCK_GROUP_SYSTEM,
4156 BTRFS_BLOCK_GROUP_METADATA,
4157 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
4158 };
bf5fc093 4159 int num_types = 4;
7fde62bf 4160 int alloc_size;
1406e432 4161 int ret = 0;
51788b1b 4162 u64 slot_count = 0;
bf5fc093 4163 int i, c;
1406e432
JB		 4164
4165 if (copy_from_user(&space_args,
4166 (struct btrfs_ioctl_space_args __user *)arg,
4167 sizeof(space_args)))
4168 return -EFAULT;
4169
bf5fc093
JB		 4170 for (i = 0; i < num_types; i++) {
4171 struct btrfs_space_info *tmp;
4172
4173 info = NULL;
4174 rcu_read_lock();
0b246afa 4175 list_for_each_entry_rcu(tmp, &fs_info->space_info,
bf5fc093
JB		 4176 list) {
4177 if (tmp->flags == types[i]) {
4178 info = tmp;
4179 break;
4180 }
4181 }
4182 rcu_read_unlock();
4183
4184 if (!info)
4185 continue;
4186
4187 down_read(&info->groups_sem);
4188 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4189 if (!list_empty(&info->block_groups[c]))
4190 slot_count++;
4191 }
4192 up_read(&info->groups_sem);
4193 }
7fde62bf 4194
36523e95
DS		 4195 /*
4196 * Global block reserve, exported as a space_info
4197 */
4198 slot_count++;
4199
7fde62bf
CM		 4200 /* space_slots == 0 means they are asking for a count */
4201 if (space_args.space_slots == 0) {
4202 space_args.total_spaces = slot_count;
4203 goto out;
4204 }
bf5fc093 4205
51788b1b 4206 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 4207
7fde62bf 4208 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 4209
7fde62bf
CM		 4210 /* we generally have at most 6 or so space infos, one for each raid
4211 * level. So, a whole page should be more than enough for everyone
4212 */
09cbfeaf 4213 if (alloc_size > PAGE_SIZE)
7fde62bf
CM		 4214 return -ENOMEM;
4215
1406e432 4216 space_args.total_spaces = 0;
8d2db785 4217 dest = kmalloc(alloc_size, GFP_KERNEL);
7fde62bf
CM		 4218 if (!dest)
4219 return -ENOMEM;
4220 dest_orig = dest;
1406e432 4221
7fde62bf 4222 /* now we have a buffer to copy into */
bf5fc093
JB		 4223 for (i = 0; i < num_types; i++) {
4224 struct btrfs_space_info *tmp;
4225
51788b1b
DR		 4226 if (!slot_count)
4227 break;
4228
bf5fc093
JB		 4229 info = NULL;
4230 rcu_read_lock();
0b246afa 4231 list_for_each_entry_rcu(tmp, &fs_info->space_info,
bf5fc093
JB		 4232 list) {
4233 if (tmp->flags == types[i]) {
4234 info = tmp;
4235 break;
4236 }
4237 }
4238 rcu_read_unlock();
7fde62bf 4239
bf5fc093
JB		 4240 if (!info)
4241 continue;
4242 down_read(&info->groups_sem);
4243 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4244 if (!list_empty(&info->block_groups[c])) {
c065f5b1
SY		 4245 get_block_group_info(&info->block_groups[c],
4246 &space);
bf5fc093
JB		 4247 memcpy(dest, &space, sizeof(space));
4248 dest++;
4249 space_args.total_spaces++;
51788b1b 4250 slot_count--;
bf5fc093 4251 }
51788b1b
DR		 4252 if (!slot_count)
4253 break;
bf5fc093
JB		 4254 }
4255 up_read(&info->groups_sem);
1406e432 4256 }
1406e432 4257
36523e95
DS		 4258 /*
4259 * Add global block reserve
4260 */
4261 if (slot_count) {
0b246afa 4262 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
36523e95
DS		 4263
4264 spin_lock(&block_rsv->lock);
4265 space.total_bytes = block_rsv->size;
4266 space.used_bytes = block_rsv->size - block_rsv->reserved;
4267 spin_unlock(&block_rsv->lock);
4268 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4269 memcpy(dest, &space, sizeof(space));
4270 space_args.total_spaces++;
4271 }
4272
2eec6c81 4273 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 4274 (arg + sizeof(struct btrfs_ioctl_space_args));
4275
4276 if (copy_to_user(user_dest, dest_orig, alloc_size))
4277 ret = -EFAULT;
4278
4279 kfree(dest_orig);
4280out:
4281 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 4282 ret = -EFAULT;
4283
4284 return ret;
4285}
4286
9a8c28be
MX		 4287static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4288 void __user *argp)
46204592 4289{
46204592
SW		 4290 struct btrfs_trans_handle *trans;
4291 u64 transid;
db5b493a 4292 int ret;
46204592 4293
d4edf39b 4294 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 4295 if (IS_ERR(trans)) {
4296 if (PTR_ERR(trans) != -ENOENT)
4297 return PTR_ERR(trans);
4298
4299 /* No running transaction, don't bother */
4300 transid = root->fs_info->last_trans_committed;
4301 goto out;
4302 }
46204592 4303 transid = trans->transid;
3a45bb20 4304 ret = btrfs_commit_transaction_async(trans, 0);
8b2b2d3c 4305 if (ret) {
3a45bb20 4306 btrfs_end_transaction(trans);
db5b493a 4307 return ret;
8b2b2d3c 4308 }
ff7c1d33 4309out:
46204592
SW		 4310 if (argp)
4311 if (copy_to_user(argp, &transid, sizeof(transid)))
4312 return -EFAULT;
4313 return 0;
4314}
4315
2ff7e61e 4316static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
9a8c28be 4317 void __user *argp)
46204592 4318{
46204592
SW		 4319 u64 transid;
4320
4321 if (argp) {
4322 if (copy_from_user(&transid, argp, sizeof(transid)))
4323 return -EFAULT;
4324 } else {
4325 transid = 0; /* current trans */
4326 }
2ff7e61e 4327 return btrfs_wait_for_commit(fs_info, transid);
46204592
SW		 4328}
4329
b8e95489 4330static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 4331{
0b246afa 4332 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
475f6387 4333 struct btrfs_ioctl_scrub_args *sa;
b8e95489 4334 int ret;
475f6387
JS		 4335
4336 if (!capable(CAP_SYS_ADMIN))
4337 return -EPERM;
4338
4339 sa = memdup_user(arg, sizeof(*sa));
4340 if (IS_ERR(sa))
4341 return PTR_ERR(sa);
4342
b8e95489
MX		 4343 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4344 ret = mnt_want_write_file(file);
4345 if (ret)
4346 goto out;
4347 }
4348
0b246afa 4349 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 4350 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4351 0);
475f6387 4352
06fe39ab 4353 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
475f6387
JS		 4354 ret = -EFAULT;
4355
b8e95489
MX		 4356 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4357 mnt_drop_write_file(file);
4358out:
475f6387
JS		 4359 kfree(sa);
4360 return ret;
4361}
4362
2ff7e61e 4363static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
475f6387
JS		 4364{
4365 if (!capable(CAP_SYS_ADMIN))
4366 return -EPERM;
4367
2ff7e61e 4368 return btrfs_scrub_cancel(fs_info);
475f6387
JS		 4369}
4370
2ff7e61e 4371static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
475f6387
JS		 4372 void __user *arg)
4373{
4374 struct btrfs_ioctl_scrub_args *sa;
4375 int ret;
4376
4377 if (!capable(CAP_SYS_ADMIN))
4378 return -EPERM;
4379
4380 sa = memdup_user(arg, sizeof(*sa));
4381 if (IS_ERR(sa))
4382 return PTR_ERR(sa);
4383
2ff7e61e 4384 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
475f6387 4385
4fa99b00 4386 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
475f6387
JS		 4387 ret = -EFAULT;
4388
4389 kfree(sa);
4390 return ret;
4391}
4392
2ff7e61e 4393static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
b27f7c0c 4394 void __user *arg)
c11d2c23
SB		 4395{
4396 struct btrfs_ioctl_get_dev_stats *sa;
4397 int ret;
4398
c11d2c23
SB		 4399 sa = memdup_user(arg, sizeof(*sa));
4400 if (IS_ERR(sa))
4401 return PTR_ERR(sa);
4402
b27f7c0c
DS		 4403 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4404 kfree(sa);
4405 return -EPERM;
4406 }
4407
2ff7e61e 4408 ret = btrfs_get_dev_stats(fs_info, sa);
c11d2c23 4409
eee99577 4410 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
c11d2c23
SB		 4411 ret = -EFAULT;
4412
4413 kfree(sa);
4414 return ret;
4415}
4416
2ff7e61e
JM		 4417static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4418 void __user *arg)
3f6bcfbd
SB		 4419{
4420 struct btrfs_ioctl_dev_replace_args *p;
4421 int ret;
4422
4423 if (!capable(CAP_SYS_ADMIN))
4424 return -EPERM;
4425
4426 p = memdup_user(arg, sizeof(*p));
4427 if (IS_ERR(p))
4428 return PTR_ERR(p);
4429
4430 switch (p->cmd) {
4431 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
bc98a42c 4432 if (sb_rdonly(fs_info->sb)) {
adfa97cb
ID		 4433 ret = -EROFS;
4434 goto out;
4435 }
171938e5 4436 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
e57138b3 4437 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd 4438 } else {
2ff7e61e 4439 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
171938e5 4440 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3f6bcfbd
SB		 4441 }
4442 break;
4443 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
0b246afa 4444 btrfs_dev_replace_status(fs_info, p);
3f6bcfbd
SB		 4445 ret = 0;
4446 break;
4447 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
17d202b9 4448 p->result = btrfs_dev_replace_cancel(fs_info);
97282031 4449 ret = 0;
3f6bcfbd
SB		 4450 break;
4451 default:
4452 ret = -EINVAL;
4453 break;
4454 }
4455
d3a53286 4456 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3f6bcfbd 4457 ret = -EFAULT;
adfa97cb 4458out:
3f6bcfbd
SB		 4459 kfree(p);
4460 return ret;
4461}
4462
d7728c96
JS		 4463static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4464{
4465 int ret = 0;
4466 int i;
740c3d22 4467 u64 rel_ptr;
d7728c96 4468 int size;
806468f8 4469 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 4470 struct inode_fs_paths *ipath = NULL;
4471 struct btrfs_path *path;
4472
82b22ac8 4473 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 4474 return -EPERM;
4475
4476 path = btrfs_alloc_path();
4477 if (!path) {
4478 ret = -ENOMEM;
4479 goto out;
4480 }
4481
4482 ipa = memdup_user(arg, sizeof(*ipa));
4483 if (IS_ERR(ipa)) {
4484 ret = PTR_ERR(ipa);
4485 ipa = NULL;
4486 goto out;
4487 }
4488
4489 size = min_t(u32, ipa->size, 4096);
4490 ipath = init_ipath(size, root, path);
4491 if (IS_ERR(ipath)) {
4492 ret = PTR_ERR(ipath);
4493 ipath = NULL;
4494 goto out;
4495 }
4496
4497 ret = paths_from_inode(ipa->inum, ipath);
4498 if (ret < 0)
4499 goto out;
4500
4501 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 4502 rel_ptr = ipath->fspath->val[i] -
4503 (u64)(unsigned long)ipath->fspath->val;
740c3d22 4504 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 4505 }
4506
718dc5fa
OS		 4507 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4508 ipath->fspath, size);
d7728c96
JS		 4509 if (ret) {
4510 ret = -EFAULT;
4511 goto out;
4512 }
4513
4514out:
4515 btrfs_free_path(path);
4516 free_ipath(ipath);
4517 kfree(ipa);
4518
4519 return ret;
4520}
4521
4522static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4523{
4524 struct btrfs_data_container *inodes = ctx;
4525 const size_t c = 3 * sizeof(u64);
4526
4527 if (inodes->bytes_left >= c) {
4528 inodes->bytes_left -= c;
4529 inodes->val[inodes->elem_cnt] = inum;
4530 inodes->val[inodes->elem_cnt + 1] = offset;
4531 inodes->val[inodes->elem_cnt + 2] = root;
4532 inodes->elem_cnt += 3;
4533 } else {
4534 inodes->bytes_missing += c - inodes->bytes_left;
4535 inodes->bytes_left = 0;
4536 inodes->elem_missed += 3;
4537 }
4538
4539 return 0;
4540}
4541
2ff7e61e 4542static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
d24a67b2 4543 void __user *arg, int version)
d7728c96
JS		 4544{
4545 int ret = 0;
4546 int size;
d7728c96
JS		 4547 struct btrfs_ioctl_logical_ino_args *loi;
4548 struct btrfs_data_container *inodes = NULL;
4549 struct btrfs_path *path = NULL;
d24a67b2 4550 bool ignore_offset;
d7728c96
JS		 4551
4552 if (!capable(CAP_SYS_ADMIN))
4553 return -EPERM;
4554
4555 loi = memdup_user(arg, sizeof(*loi));
7b9ea627
SV		 4556 if (IS_ERR(loi))
4557 return PTR_ERR(loi);
d7728c96 4558
d24a67b2
ZB		 4559 if (version == 1) {
4560 ignore_offset = false;
b115e3bc 4561 size = min_t(u32, loi->size, SZ_64K);
d24a67b2
ZB		 4562 } else {
4563 /* All reserved bits must be 0 for now */
4564 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4565 ret = -EINVAL;
4566 goto out_loi;
4567 }
4568 /* Only accept flags we have defined so far */
4569 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4570 ret = -EINVAL;
4571 goto out_loi;
4572 }
4573 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
b115e3bc 4574 size = min_t(u32, loi->size, SZ_16M);
d24a67b2
ZB		 4575 }
4576
d7728c96
JS		 4577 path = btrfs_alloc_path();
4578 if (!path) {
4579 ret = -ENOMEM;
4580 goto out;
4581 }
4582
d7728c96
JS		 4583 inodes = init_data_container(size);
4584 if (IS_ERR(inodes)) {
4585 ret = PTR_ERR(inodes);
4586 inodes = NULL;
4587 goto out;
4588 }
4589
2ff7e61e 4590 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
d24a67b2 4591 build_ino_list, inodes, ignore_offset);
df031f07 4592 if (ret == -EINVAL)
d7728c96
JS		 4593 ret = -ENOENT;
4594 if (ret < 0)
4595 goto out;
4596
718dc5fa
OS		 4597 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4598 size);
d7728c96
JS		 4599 if (ret)
4600 ret = -EFAULT;
4601
4602out:
4603 btrfs_free_path(path);
f54de068 4604 kvfree(inodes);
d24a67b2 4605out_loi:
d7728c96
JS		 4606 kfree(loi);
4607
4608 return ret;
4609}
4610
008ef096 4611void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
c9e9f97b
ID		 4612 struct btrfs_ioctl_balance_args *bargs)
4613{
4614 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4615
4616 bargs->flags = bctl->flags;
4617
3009a62f 4618 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
837d5b6e
ID		 4619 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4620 if (atomic_read(&fs_info->balance_pause_req))
4621 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 4622 if (atomic_read(&fs_info->balance_cancel_req))
4623 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 4624
c9e9f97b
ID		 4625 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4626 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4627 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce 4628
008ef096
DS		 4629 spin_lock(&fs_info->balance_lock);
4630 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4631 spin_unlock(&fs_info->balance_lock);
c9e9f97b
ID		 4632}
4633
9ba1f6e4 4634static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 4635{
496ad9aa 4636 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 4637 struct btrfs_fs_info *fs_info = root->fs_info;
4638 struct btrfs_ioctl_balance_args *bargs;
4639 struct btrfs_balance_control *bctl;
ed0fb78f 4640 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 4641 int ret;
4642
4643 if (!capable(CAP_SYS_ADMIN))
4644 return -EPERM;
4645
e54bfa31 4646 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 4647 if (ret)
4648 return ret;
4649
ed0fb78f 4650again:
171938e5 4651 if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
ed0fb78f
ID		 4652 mutex_lock(&fs_info->balance_mutex);
4653 need_unlock = true;
4654 goto locked;
4655 }
4656
4657 /*
01327610 4658 * mut. excl. ops lock is locked. Three possibilities:
ed0fb78f
ID		 4659 * (1) some other op is running
4660 * (2) balance is running
4661 * (3) balance is paused -- special case (think resume)
4662 */
c9e9f97b 4663 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 4664 if (fs_info->balance_ctl) {
4665 /* this is either (2) or (3) */
3009a62f 4666 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
ed0fb78f 4667 mutex_unlock(&fs_info->balance_mutex);
dccdb07b
DS		 4668 /*
4669 * Lock released to allow other waiters to continue,
4670 * we'll reexamine the status again.
4671 */
ed0fb78f
ID		 4672 mutex_lock(&fs_info->balance_mutex);
4673
4674 if (fs_info->balance_ctl &&
3009a62f 4675 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
ed0fb78f
ID		 4676 /* this is (3) */
4677 need_unlock = false;
4678 goto locked;
4679 }
4680
4681 mutex_unlock(&fs_info->balance_mutex);
ed0fb78f
ID		 4682 goto again;
4683 } else {
4684 /* this is (2) */
4685 mutex_unlock(&fs_info->balance_mutex);
4686 ret = -EINPROGRESS;
4687 goto out;
4688 }
4689 } else {
4690 /* this is (1) */
4691 mutex_unlock(&fs_info->balance_mutex);
e57138b3 4692 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 4693 goto out;
4694 }
4695
4696locked:
171938e5 4697 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
c9e9f97b
ID		 4698
4699 if (arg) {
4700 bargs = memdup_user(arg, sizeof(*bargs));
4701 if (IS_ERR(bargs)) {
4702 ret = PTR_ERR(bargs);
ed0fb78f 4703 goto out_unlock;
c9e9f97b 4704 }
de322263
ID		 4705
4706 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4707 if (!fs_info->balance_ctl) {
4708 ret = -ENOTCONN;
4709 goto out_bargs;
4710 }
4711
4712 bctl = fs_info->balance_ctl;
4713 spin_lock(&fs_info->balance_lock);
4714 bctl->flags |= BTRFS_BALANCE_RESUME;
4715 spin_unlock(&fs_info->balance_lock);
4716
4717 goto do_balance;
4718 }
c9e9f97b
ID		 4719 } else {
4720 bargs = NULL;
4721 }
4722
ed0fb78f 4723 if (fs_info->balance_ctl) {
837d5b6e
ID		 4724 ret = -EINPROGRESS;
4725 goto out_bargs;
4726 }
4727
8d2db785 4728 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
c9e9f97b
ID		 4729 if (!bctl) {
4730 ret = -ENOMEM;
4731 goto out_bargs;
4732 }
4733
c9e9f97b
ID		 4734 if (arg) {
4735 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4736 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4737 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4738
4739 bctl->flags = bargs->flags;
f43ffb60
ID		 4740 } else {
4741 /* balance everything - no filters */
4742 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 4743 }
4744
8eb93459
DS		 4745 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4746 ret = -EINVAL;
0f89abf5 4747 goto out_bctl;
8eb93459
DS		 4748 }
4749
de322263 4750do_balance:
c9e9f97b 4751 /*
149196a2
DS		 4752 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
4753 * btrfs_balance. bctl is freed in reset_balance_state, or, if
4754 * restriper was paused all the way until unmount, in free_fs_info.
4755 * The flag should be cleared after reset_balance_state.
c9e9f97b 4756 */
ed0fb78f
ID		 4757 need_unlock = false;
4758
6fcf6e2b 4759 ret = btrfs_balance(fs_info, bctl, bargs);
0f89abf5 4760 bctl = NULL;
ed0fb78f 4761
d00c2d9c 4762 if ((ret == 0 || ret == -ECANCELED) && arg) {
c9e9f97b
ID		 4763 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4764 ret = -EFAULT;
4765 }
4766
0f89abf5
CE		 4767out_bctl:
4768 kfree(bctl);
c9e9f97b
ID		 4769out_bargs:
4770 kfree(bargs);
ed0fb78f 4771out_unlock:
c9e9f97b 4772 mutex_unlock(&fs_info->balance_mutex);
ed0fb78f 4773 if (need_unlock)
171938e5 4774 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
ed0fb78f 4775out:
e54bfa31 4776 mnt_drop_write_file(file);
c9e9f97b
ID		 4777 return ret;
4778}
4779
2ff7e61e 4780static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
837d5b6e
ID		 4781{
4782 if (!capable(CAP_SYS_ADMIN))
4783 return -EPERM;
4784
4785 switch (cmd) {
4786 case BTRFS_BALANCE_CTL_PAUSE:
0b246afa 4787 return btrfs_pause_balance(fs_info);
a7e99c69 4788 case BTRFS_BALANCE_CTL_CANCEL:
0b246afa 4789 return btrfs_cancel_balance(fs_info);
837d5b6e
ID		 4790 }
4791
4792 return -EINVAL;
4793}
4794
2ff7e61e 4795static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
19a39dce
ID		 4796 void __user *arg)
4797{
19a39dce
ID		 4798 struct btrfs_ioctl_balance_args *bargs;
4799 int ret = 0;
4800
4801 if (!capable(CAP_SYS_ADMIN))
4802 return -EPERM;
4803
4804 mutex_lock(&fs_info->balance_mutex);
4805 if (!fs_info->balance_ctl) {
4806 ret = -ENOTCONN;
4807 goto out;
4808 }
4809
8d2db785 4810 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
19a39dce
ID		 4811 if (!bargs) {
4812 ret = -ENOMEM;
4813 goto out;
4814 }
4815
008ef096 4816 btrfs_update_ioctl_balance_args(fs_info, bargs);
19a39dce
ID		 4817
4818 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4819 ret = -EFAULT;
4820
4821 kfree(bargs);
4822out:
4823 mutex_unlock(&fs_info->balance_mutex);
4824 return ret;
4825}
4826
905b0dda 4827static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4828{
0b246afa
JM		 4829 struct inode *inode = file_inode(file);
4830 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5d13a37b 4831 struct btrfs_ioctl_quota_ctl_args *sa;
5d13a37b 4832 int ret;
5d13a37b
AJ		 4833
4834 if (!capable(CAP_SYS_ADMIN))
4835 return -EPERM;
4836
905b0dda
MX		 4837 ret = mnt_want_write_file(file);
4838 if (ret)
4839 return ret;
5d13a37b
AJ		 4840
4841 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4842 if (IS_ERR(sa)) {
4843 ret = PTR_ERR(sa);
4844 goto drop_write;
4845 }
5d13a37b 4846
0b246afa 4847 down_write(&fs_info->subvol_sem);
5d13a37b
AJ		 4848
4849 switch (sa->cmd) {
4850 case BTRFS_QUOTA_CTL_ENABLE:
340f1aa2 4851 ret = btrfs_quota_enable(fs_info);
5d13a37b
AJ		 4852 break;
4853 case BTRFS_QUOTA_CTL_DISABLE:
340f1aa2 4854 ret = btrfs_quota_disable(fs_info);
5d13a37b 4855 break;
5d13a37b
AJ		 4856 default:
4857 ret = -EINVAL;
4858 break;
4859 }
4860
5d13a37b 4861 kfree(sa);
0b246afa 4862 up_write(&fs_info->subvol_sem);
905b0dda
MX		 4863drop_write:
4864 mnt_drop_write_file(file);
5d13a37b
AJ		 4865 return ret;
4866}
4867
905b0dda 4868static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4869{
0b246afa
JM		 4870 struct inode *inode = file_inode(file);
4871 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4872 struct btrfs_root *root = BTRFS_I(inode)->root;
5d13a37b
AJ		 4873 struct btrfs_ioctl_qgroup_assign_args *sa;
4874 struct btrfs_trans_handle *trans;
4875 int ret;
4876 int err;
4877
4878 if (!capable(CAP_SYS_ADMIN))
4879 return -EPERM;
4880
905b0dda
MX		 4881 ret = mnt_want_write_file(file);
4882 if (ret)
4883 return ret;
5d13a37b
AJ		 4884
4885 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4886 if (IS_ERR(sa)) {
4887 ret = PTR_ERR(sa);
4888 goto drop_write;
4889 }
5d13a37b
AJ		 4890
4891 trans = btrfs_join_transaction(root);
4892 if (IS_ERR(trans)) {
4893 ret = PTR_ERR(trans);
4894 goto out;
4895 }
4896
5d13a37b 4897 if (sa->assign) {
9f8a6ce6 4898 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
5d13a37b 4899 } else {
39616c27 4900 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
5d13a37b
AJ		 4901 }
4902
e082f563 4903 /* update qgroup status and info */
280f8bd2 4904 err = btrfs_run_qgroups(trans);
e082f563 4905 if (err < 0)
0b246afa
JM		 4906 btrfs_handle_fs_error(fs_info, err,
4907 "failed to update qgroup status and info");
3a45bb20 4908 err = btrfs_end_transaction(trans);
5d13a37b
AJ		 4909 if (err && !ret)
4910 ret = err;
4911
4912out:
4913 kfree(sa);
905b0dda
MX		 4914drop_write:
4915 mnt_drop_write_file(file);
5d13a37b
AJ		 4916 return ret;
4917}
4918
905b0dda 4919static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4920{
0b246afa 4921 struct inode *inode = file_inode(file);
0b246afa 4922 struct btrfs_root *root = BTRFS_I(inode)->root;
5d13a37b
AJ		 4923 struct btrfs_ioctl_qgroup_create_args *sa;
4924 struct btrfs_trans_handle *trans;
4925 int ret;
4926 int err;
4927
4928 if (!capable(CAP_SYS_ADMIN))
4929 return -EPERM;
4930
905b0dda
MX		 4931 ret = mnt_want_write_file(file);
4932 if (ret)
4933 return ret;
5d13a37b
AJ		 4934
4935 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4936 if (IS_ERR(sa)) {
4937 ret = PTR_ERR(sa);
4938 goto drop_write;
4939 }
5d13a37b 4940
d86e56cf
MX		 4941 if (!sa->qgroupid) {
4942 ret = -EINVAL;
4943 goto out;
4944 }
4945
5d13a37b
AJ		 4946 trans = btrfs_join_transaction(root);
4947 if (IS_ERR(trans)) {
4948 ret = PTR_ERR(trans);
4949 goto out;
4950 }
4951
5d13a37b 4952 if (sa->create) {
49a05ecd 4953 ret = btrfs_create_qgroup(trans, sa->qgroupid);
5d13a37b 4954 } else {
3efbee1d 4955 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
5d13a37b
AJ		 4956 }
4957
3a45bb20 4958 err = btrfs_end_transaction(trans);
5d13a37b
AJ		 4959 if (err && !ret)
4960 ret = err;
4961
4962out:
4963 kfree(sa);
905b0dda
MX		 4964drop_write:
4965 mnt_drop_write_file(file);
5d13a37b
AJ		 4966 return ret;
4967}
4968
905b0dda 4969static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4970{
0b246afa 4971 struct inode *inode = file_inode(file);
0b246afa 4972 struct btrfs_root *root = BTRFS_I(inode)->root;
5d13a37b
AJ		 4973 struct btrfs_ioctl_qgroup_limit_args *sa;
4974 struct btrfs_trans_handle *trans;
4975 int ret;
4976 int err;
4977 u64 qgroupid;
4978
4979 if (!capable(CAP_SYS_ADMIN))
4980 return -EPERM;
4981
905b0dda
MX		 4982 ret = mnt_want_write_file(file);
4983 if (ret)
4984 return ret;
5d13a37b
AJ		 4985
4986 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4987 if (IS_ERR(sa)) {
4988 ret = PTR_ERR(sa);
4989 goto drop_write;
4990 }
5d13a37b
AJ		 4991
4992 trans = btrfs_join_transaction(root);
4993 if (IS_ERR(trans)) {
4994 ret = PTR_ERR(trans);
4995 goto out;
4996 }
4997
4998 qgroupid = sa->qgroupid;
4999 if (!qgroupid) {
5000 /* take the current subvol as qgroup */
5001 qgroupid = root->root_key.objectid;
5002 }
5003
f0042d5e 5004 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
5d13a37b 5005
3a45bb20 5006 err = btrfs_end_transaction(trans);
5d13a37b
AJ		 5007 if (err && !ret)
5008 ret = err;
5009
5010out:
5011 kfree(sa);
905b0dda
MX		 5012drop_write:
5013 mnt_drop_write_file(file);
5d13a37b
AJ		 5014 return ret;
5015}
5016
2f232036
JS		 5017static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
5018{
0b246afa
JM		 5019 struct inode *inode = file_inode(file);
5020 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2f232036
JS		 5021 struct btrfs_ioctl_quota_rescan_args *qsa;
5022 int ret;
5023
5024 if (!capable(CAP_SYS_ADMIN))
5025 return -EPERM;
5026
5027 ret = mnt_want_write_file(file);
5028 if (ret)
5029 return ret;
5030
5031 qsa = memdup_user(arg, sizeof(*qsa));
5032 if (IS_ERR(qsa)) {
5033 ret = PTR_ERR(qsa);
5034 goto drop_write;
5035 }
5036
5037 if (qsa->flags) {
5038 ret = -EINVAL;
5039 goto out;
5040 }
5041
0b246afa 5042 ret = btrfs_qgroup_rescan(fs_info);
2f232036
JS		 5043
5044out:
5045 kfree(qsa);
5046drop_write:
5047 mnt_drop_write_file(file);
5048 return ret;
5049}
5050
5051static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
5052{
0b246afa
JM		 5053 struct inode *inode = file_inode(file);
5054 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2f232036
JS		 5055 struct btrfs_ioctl_quota_rescan_args *qsa;
5056 int ret = 0;
5057
5058 if (!capable(CAP_SYS_ADMIN))
5059 return -EPERM;
5060
8d2db785 5061 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
2f232036
JS		 5062 if (!qsa)
5063 return -ENOMEM;
5064
0b246afa 5065 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
2f232036 5066 qsa->flags = 1;
0b246afa 5067 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
2f232036
JS		 5068 }
5069
5070 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5071 ret = -EFAULT;
5072
5073 kfree(qsa);
5074 return ret;
5075}
5076
57254b6e
JS		 5077static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5078{
0b246afa
JM		 5079 struct inode *inode = file_inode(file);
5080 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
57254b6e
JS		 5081
5082 if (!capable(CAP_SYS_ADMIN))
5083 return -EPERM;
5084
0b246afa 5085 return btrfs_qgroup_wait_for_completion(fs_info, true);
57254b6e
JS		 5086}
5087
abccd00f
HM		 5088static long _btrfs_ioctl_set_received_subvol(struct file *file,
5089 struct btrfs_ioctl_received_subvol_args *sa)
8ea05e3a 5090{
496ad9aa 5091 struct inode *inode = file_inode(file);
0b246afa 5092 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8ea05e3a
AB		 5093 struct btrfs_root *root = BTRFS_I(inode)->root;
5094 struct btrfs_root_item *root_item = &root->root_item;
5095 struct btrfs_trans_handle *trans;
95582b00 5096 struct timespec64 ct = current_time(inode);
8ea05e3a 5097 int ret = 0;
dd5f9615 5098 int received_uuid_changed;
8ea05e3a 5099
bd60ea0f
DS		 5100 if (!inode_owner_or_capable(inode))
5101 return -EPERM;
5102
8ea05e3a
AB		 5103 ret = mnt_want_write_file(file);
5104 if (ret < 0)
5105 return ret;
5106
0b246afa 5107 down_write(&fs_info->subvol_sem);
8ea05e3a 5108
4a0cc7ca 5109 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
8ea05e3a
AB		 5110 ret = -EINVAL;
5111 goto out;
5112 }
5113
5114 if (btrfs_root_readonly(root)) {
5115 ret = -EROFS;
5116 goto out;
5117 }
5118
dd5f9615
SB		 5119 /*
5120 * 1 - root item
5121 * 2 - uuid items (received uuid + subvol uuid)
5122 */
5123 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 5124 if (IS_ERR(trans)) {
5125 ret = PTR_ERR(trans);
5126 trans = NULL;
5127 goto out;
5128 }
5129
5130 sa->rtransid = trans->transid;
5131 sa->rtime.sec = ct.tv_sec;
5132 sa->rtime.nsec = ct.tv_nsec;
5133
dd5f9615
SB		 5134 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5135 BTRFS_UUID_SIZE);
5136 if (received_uuid_changed &&
d87ff758 5137 !btrfs_is_empty_uuid(root_item->received_uuid)) {
d1957791 5138 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
d87ff758
NB		 5139 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5140 root->root_key.objectid);
5141 if (ret && ret != -ENOENT) {
5142 btrfs_abort_transaction(trans, ret);
5143 btrfs_end_transaction(trans);
5144 goto out;
5145 }
5146 }
8ea05e3a
AB		 5147 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5148 btrfs_set_root_stransid(root_item, sa->stransid);
5149 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 5150 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5151 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5152 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5153 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a 5154
0b246afa 5155 ret = btrfs_update_root(trans, fs_info->tree_root,
8ea05e3a
AB		 5156 &root->root_key, &root->root_item);
5157 if (ret < 0) {
3a45bb20 5158 btrfs_end_transaction(trans);
8ea05e3a 5159 goto out;
dd5f9615
SB		 5160 }
5161 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
cdb345a8 5162 ret = btrfs_uuid_tree_add(trans, sa->uuid,
dd5f9615
SB		 5163 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5164 root->root_key.objectid);
5165 if (ret < 0 && ret != -EEXIST) {
66642832 5166 btrfs_abort_transaction(trans, ret);
efd38150 5167 btrfs_end_transaction(trans);
8ea05e3a 5168 goto out;
dd5f9615
SB		 5169 }
5170 }
3a45bb20 5171 ret = btrfs_commit_transaction(trans);
abccd00f 5172out:
0b246afa 5173 up_write(&fs_info->subvol_sem);
abccd00f
HM		 5174 mnt_drop_write_file(file);
5175 return ret;
5176}
5177
5178#ifdef CONFIG_64BIT
5179static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5180 void __user *arg)
5181{
5182 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5183 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5184 int ret = 0;
5185
5186 args32 = memdup_user(arg, sizeof(*args32));
7b9ea627
SV		 5187 if (IS_ERR(args32))
5188 return PTR_ERR(args32);
abccd00f 5189
8d2db785 5190 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
84dbeb87
DC		 5191 if (!args64) {
5192 ret = -ENOMEM;
abccd00f
HM		 5193 goto out;
5194 }
5195
5196 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5197 args64->stransid = args32->stransid;
5198 args64->rtransid = args32->rtransid;
5199 args64->stime.sec = args32->stime.sec;
5200 args64->stime.nsec = args32->stime.nsec;
5201 args64->rtime.sec = args32->rtime.sec;
5202 args64->rtime.nsec = args32->rtime.nsec;
5203 args64->flags = args32->flags;
5204
5205 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5206 if (ret)
5207 goto out;
5208
5209 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5210 args32->stransid = args64->stransid;
5211 args32->rtransid = args64->rtransid;
5212 args32->stime.sec = args64->stime.sec;
5213 args32->stime.nsec = args64->stime.nsec;
5214 args32->rtime.sec = args64->rtime.sec;
5215 args32->rtime.nsec = args64->rtime.nsec;
5216 args32->flags = args64->flags;
5217
5218 ret = copy_to_user(arg, args32, sizeof(*args32));
5219 if (ret)
5220 ret = -EFAULT;
5221
5222out:
5223 kfree(args32);
5224 kfree(args64);
5225 return ret;
5226}
5227#endif
5228
5229static long btrfs_ioctl_set_received_subvol(struct file *file,
5230 void __user *arg)
5231{
5232 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5233 int ret = 0;
5234
5235 sa = memdup_user(arg, sizeof(*sa));
7b9ea627
SV		 5236 if (IS_ERR(sa))
5237 return PTR_ERR(sa);
abccd00f
HM		 5238
5239 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5240
5241 if (ret)
5242 goto out;
5243
8ea05e3a
AB		 5244 ret = copy_to_user(arg, sa, sizeof(*sa));
5245 if (ret)
5246 ret = -EFAULT;
5247
5248out:
5249 kfree(sa);
8ea05e3a
AB		 5250 return ret;
5251}
5252
867ab667 5253static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5254{
0b246afa
JM		 5255 struct inode *inode = file_inode(file);
5256 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
a1b83ac5 5257 size_t len;
867ab667 5258 int ret;
a1b83ac5
AJ		 5259 char label[BTRFS_LABEL_SIZE];
5260
0b246afa
JM		 5261 spin_lock(&fs_info->super_lock);
5262 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5263 spin_unlock(&fs_info->super_lock);
a1b83ac5
AJ		 5264
5265 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 5266
5267 if (len == BTRFS_LABEL_SIZE) {
0b246afa
JM		 5268 btrfs_warn(fs_info,
5269 "label is too long, return the first %zu bytes",
5270 --len);
867ab667 5271 }
5272
867ab667 5273 ret = copy_to_user(arg, label, len);
867ab667 5274
5275 return ret ? -EFAULT : 0;
5276}
5277
a8bfd4ab 5278static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5279{
0b246afa
JM		 5280 struct inode *inode = file_inode(file);
5281 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5282 struct btrfs_root *root = BTRFS_I(inode)->root;
5283 struct btrfs_super_block *super_block = fs_info->super_copy;
a8bfd4ab 5284 struct btrfs_trans_handle *trans;
5285 char label[BTRFS_LABEL_SIZE];
5286 int ret;
5287
5288 if (!capable(CAP_SYS_ADMIN))
5289 return -EPERM;
5290
5291 if (copy_from_user(label, arg, sizeof(label)))
5292 return -EFAULT;
5293
5294 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
0b246afa 5295 btrfs_err(fs_info,
5d163e0e
JM		 5296 "unable to set label with more than %d bytes",
5297 BTRFS_LABEL_SIZE - 1);
a8bfd4ab 5298 return -EINVAL;
5299 }
5300
5301 ret = mnt_want_write_file(file);
5302 if (ret)
5303 return ret;
5304
a8bfd4ab 5305 trans = btrfs_start_transaction(root, 0);
5306 if (IS_ERR(trans)) {
5307 ret = PTR_ERR(trans);
5308 goto out_unlock;
5309 }
5310
0b246afa 5311 spin_lock(&fs_info->super_lock);
a8bfd4ab 5312 strcpy(super_block->label, label);
0b246afa 5313 spin_unlock(&fs_info->super_lock);
3a45bb20 5314 ret = btrfs_commit_transaction(trans);
a8bfd4ab 5315
5316out_unlock:
a8bfd4ab 5317 mnt_drop_write_file(file);
5318 return ret;
5319}
5320
2eaa055f
JM		 5321#define INIT_FEATURE_FLAGS(suffix) \
5322 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5323 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5324 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5325
d5131b65 5326int btrfs_ioctl_get_supported_features(void __user *arg)
2eaa055f 5327{
4d4ab6d6 5328 static const struct btrfs_ioctl_feature_flags features[3] = {
2eaa055f
JM		 5329 INIT_FEATURE_FLAGS(SUPP),
5330 INIT_FEATURE_FLAGS(SAFE_SET),
5331 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5332 };
5333
5334 if (copy_to_user(arg, &features, sizeof(features)))
5335 return -EFAULT;
5336
5337 return 0;
5338}
5339
5340static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5341{
0b246afa
JM		 5342 struct inode *inode = file_inode(file);
5343 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5344 struct btrfs_super_block *super_block = fs_info->super_copy;
2eaa055f
JM		 5345 struct btrfs_ioctl_feature_flags features;
5346
5347 features.compat_flags = btrfs_super_compat_flags(super_block);
5348 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5349 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5350
5351 if (copy_to_user(arg, &features, sizeof(features)))
5352 return -EFAULT;
5353
5354 return 0;
5355}
5356
2ff7e61e 5357static int check_feature_bits(struct btrfs_fs_info *fs_info,
3b02a68a 5358 enum btrfs_feature_set set,
2eaa055f
JM		 5359 u64 change_mask, u64 flags, u64 supported_flags,
5360 u64 safe_set, u64 safe_clear)
5361{
3b02a68a
JM		 5362 const char *type = btrfs_feature_set_names[set];
5363 char *names;
2eaa055f
JM		 5364 u64 disallowed, unsupported;
5365 u64 set_mask = flags & change_mask;
5366 u64 clear_mask = ~flags & change_mask;
5367
5368 unsupported = set_mask & ~supported_flags;
5369 if (unsupported) {
3b02a68a
JM		 5370 names = btrfs_printable_features(set, unsupported);
5371 if (names) {
0b246afa
JM		 5372 btrfs_warn(fs_info,
5373 "this kernel does not support the %s feature bit%s",
5374 names, strchr(names, ',') ? "s" : "");
3b02a68a
JM		 5375 kfree(names);
5376 } else
0b246afa
JM		 5377 btrfs_warn(fs_info,
5378 "this kernel does not support %s bits 0x%llx",
5379 type, unsupported);
2eaa055f
JM		 5380 return -EOPNOTSUPP;
5381 }
5382
5383 disallowed = set_mask & ~safe_set;
5384 if (disallowed) {
3b02a68a
JM		 5385 names = btrfs_printable_features(set, disallowed);
5386 if (names) {
0b246afa
JM		 5387 btrfs_warn(fs_info,
5388 "can't set the %s feature bit%s while mounted",
5389 names, strchr(names, ',') ? "s" : "");
3b02a68a
JM		 5390 kfree(names);
5391 } else
0b246afa
JM		 5392 btrfs_warn(fs_info,
5393 "can't set %s bits 0x%llx while mounted",
5394 type, disallowed);
2eaa055f
JM		 5395 return -EPERM;
5396 }
5397
5398 disallowed = clear_mask & ~safe_clear;
5399 if (disallowed) {
3b02a68a
JM		 5400 names = btrfs_printable_features(set, disallowed);
5401 if (names) {
0b246afa
JM		 5402 btrfs_warn(fs_info,
5403 "can't clear the %s feature bit%s while mounted",
5404 names, strchr(names, ',') ? "s" : "");
3b02a68a
JM		 5405 kfree(names);
5406 } else
0b246afa
JM		 5407 btrfs_warn(fs_info,
5408 "can't clear %s bits 0x%llx while mounted",
5409 type, disallowed);
2eaa055f
JM		 5410 return -EPERM;
5411 }
5412
5413 return 0;
5414}
5415
2ff7e61e
JM		 5416#define check_feature(fs_info, change_mask, flags, mask_base) \
5417check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
2eaa055f
JM		 5418 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5419 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5420 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5421
5422static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5423{
0b246afa
JM		 5424 struct inode *inode = file_inode(file);
5425 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5426 struct btrfs_root *root = BTRFS_I(inode)->root;
5427 struct btrfs_super_block *super_block = fs_info->super_copy;
2eaa055f
JM		 5428 struct btrfs_ioctl_feature_flags flags[2];
5429 struct btrfs_trans_handle *trans;
5430 u64 newflags;
5431 int ret;
5432
5433 if (!capable(CAP_SYS_ADMIN))
5434 return -EPERM;
5435
5436 if (copy_from_user(flags, arg, sizeof(flags)))
5437 return -EFAULT;
5438
5439 /* Nothing to do */
5440 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5441 !flags[0].incompat_flags)
5442 return 0;
5443
2ff7e61e 5444 ret = check_feature(fs_info, flags[0].compat_flags,
2eaa055f
JM		 5445 flags[1].compat_flags, COMPAT);
5446 if (ret)
5447 return ret;
5448
2ff7e61e 5449 ret = check_feature(fs_info, flags[0].compat_ro_flags,
2eaa055f
JM		 5450 flags[1].compat_ro_flags, COMPAT_RO);
5451 if (ret)
5452 return ret;
5453
2ff7e61e 5454 ret = check_feature(fs_info, flags[0].incompat_flags,
2eaa055f
JM		 5455 flags[1].incompat_flags, INCOMPAT);
5456 if (ret)
5457 return ret;
5458
7ab19625
DS		 5459 ret = mnt_want_write_file(file);
5460 if (ret)
5461 return ret;
5462
8051aa1a 5463 trans = btrfs_start_transaction(root, 0);
7ab19625
DS		 5464 if (IS_ERR(trans)) {
5465 ret = PTR_ERR(trans);
5466 goto out_drop_write;
5467 }
2eaa055f 5468
0b246afa 5469 spin_lock(&fs_info->super_lock);
2eaa055f
JM		 5470 newflags = btrfs_super_compat_flags(super_block);
5471 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5472 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5473 btrfs_set_super_compat_flags(super_block, newflags);
5474
5475 newflags = btrfs_super_compat_ro_flags(super_block);
5476 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5477 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5478 btrfs_set_super_compat_ro_flags(super_block, newflags);
5479
5480 newflags = btrfs_super_incompat_flags(super_block);
5481 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5482 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5483 btrfs_set_super_incompat_flags(super_block, newflags);
0b246afa 5484 spin_unlock(&fs_info->super_lock);
2eaa055f 5485
3a45bb20 5486 ret = btrfs_commit_transaction(trans);
7ab19625
DS		 5487out_drop_write:
5488 mnt_drop_write_file(file);
5489
5490 return ret;
2eaa055f
JM		 5491}
5492
2351f431
JB		 5493static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
5494{
5495 struct btrfs_ioctl_send_args *arg;
5496 int ret;
5497
5498 if (compat) {
5499#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5500 struct btrfs_ioctl_send_args_32 args32;
5501
5502 ret = copy_from_user(&args32, argp, sizeof(args32));
5503 if (ret)
5504 return -EFAULT;
5505 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5506 if (!arg)
5507 return -ENOMEM;
5508 arg->send_fd = args32.send_fd;
5509 arg->clone_sources_count = args32.clone_sources_count;
5510 arg->clone_sources = compat_ptr(args32.clone_sources);
5511 arg->parent_root = args32.parent_root;
5512 arg->flags = args32.flags;
5513 memcpy(arg->reserved, args32.reserved,
5514 sizeof(args32.reserved));
5515#else
5516 return -ENOTTY;
5517#endif
5518 } else {
5519 arg = memdup_user(argp, sizeof(*arg));
5520 if (IS_ERR(arg))
5521 return PTR_ERR(arg);
5522 }
5523 ret = btrfs_ioctl_send(file, arg);
5524 kfree(arg);
5525 return ret;
5526}
5527
f46b5a66
CH		 5528long btrfs_ioctl(struct file *file, unsigned int
5529 cmd, unsigned long arg)
5530{
0b246afa
JM		 5531 struct inode *inode = file_inode(file);
5532 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5533 struct btrfs_root *root = BTRFS_I(inode)->root;
4bcabaa3 5534 void __user *argp = (void __user *)arg;
f46b5a66
CH		 5535
5536 switch (cmd) {
6cbff00f
CH		 5537 case FS_IOC_GETFLAGS:
5538 return btrfs_ioctl_getflags(file, argp);
5539 case FS_IOC_SETFLAGS:
5540 return btrfs_ioctl_setflags(file, argp);
5541 case FS_IOC_GETVERSION:
5542 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 5543 case FITRIM:
5544 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 5545 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 5546 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 5547 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 5548 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 5549 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 5550 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 5551 case BTRFS_IOC_SUBVOL_CREATE_V2:
5552 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 5553 case BTRFS_IOC_SNAP_DESTROY:
5554 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 5555 case BTRFS_IOC_SUBVOL_GETFLAGS:
5556 return btrfs_ioctl_subvol_getflags(file, argp);
5557 case BTRFS_IOC_SUBVOL_SETFLAGS:
5558 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 5559 case BTRFS_IOC_DEFAULT_SUBVOL:
5560 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 5561 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 5562 return btrfs_ioctl_defrag(file, NULL);
5563 case BTRFS_IOC_DEFRAG_RANGE:
5564 return btrfs_ioctl_defrag(file, argp);
f46b5a66 5565 case BTRFS_IOC_RESIZE:
198605a8 5566 return btrfs_ioctl_resize(file, argp);
f46b5a66 5567 case BTRFS_IOC_ADD_DEV:
2ff7e61e 5568 return btrfs_ioctl_add_dev(fs_info, argp);
f46b5a66 5569 case BTRFS_IOC_RM_DEV:
da24927b 5570 return btrfs_ioctl_rm_dev(file, argp);
6b526ed7
AJ		 5571 case BTRFS_IOC_RM_DEV_V2:
5572 return btrfs_ioctl_rm_dev_v2(file, argp);
475f6387 5573 case BTRFS_IOC_FS_INFO:
2ff7e61e 5574 return btrfs_ioctl_fs_info(fs_info, argp);
475f6387 5575 case BTRFS_IOC_DEV_INFO:
2ff7e61e 5576 return btrfs_ioctl_dev_info(fs_info, argp);
f46b5a66 5577 case BTRFS_IOC_BALANCE:
9ba1f6e4 5578 return btrfs_ioctl_balance(file, NULL);
ac8e9819
CM		 5579 case BTRFS_IOC_TREE_SEARCH:
5580 return btrfs_ioctl_tree_search(file, argp);
cc68a8a5
GH		 5581 case BTRFS_IOC_TREE_SEARCH_V2:
5582 return btrfs_ioctl_tree_search_v2(file, argp);
ac8e9819
CM		 5583 case BTRFS_IOC_INO_LOOKUP:
5584 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 5585 case BTRFS_IOC_INO_PATHS:
5586 return btrfs_ioctl_ino_to_path(root, argp);
5587 case BTRFS_IOC_LOGICAL_INO:
d24a67b2
ZB		 5588 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5589 case BTRFS_IOC_LOGICAL_INO_V2:
5590 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
1406e432 5591 case BTRFS_IOC_SPACE_INFO:
2ff7e61e 5592 return btrfs_ioctl_space_info(fs_info, argp);
9b199859
FDBM		 5593 case BTRFS_IOC_SYNC: {
5594 int ret;
5595
82b3e53b 5596 ret = btrfs_start_delalloc_roots(fs_info, -1);
9b199859
FDBM		 5597 if (ret)
5598 return ret;
0b246afa 5599 ret = btrfs_sync_fs(inode->i_sb, 1);
2fad4e83
DS		 5600 /*
5601 * The transaction thread may want to do more work,
01327610 5602 * namely it pokes the cleaner kthread that will start
2fad4e83
DS		 5603 * processing uncleaned subvols.
5604 */
0b246afa 5605 wake_up_process(fs_info->transaction_kthread);
9b199859
FDBM		 5606 return ret;
5607 }
46204592 5608 case BTRFS_IOC_START_SYNC:
9a8c28be 5609 return btrfs_ioctl_start_sync(root, argp);
46204592 5610 case BTRFS_IOC_WAIT_SYNC:
2ff7e61e 5611 return btrfs_ioctl_wait_sync(fs_info, argp);
475f6387 5612 case BTRFS_IOC_SCRUB:
b8e95489 5613 return btrfs_ioctl_scrub(file, argp);
475f6387 5614 case BTRFS_IOC_SCRUB_CANCEL:
2ff7e61e 5615 return btrfs_ioctl_scrub_cancel(fs_info);
475f6387 5616 case BTRFS_IOC_SCRUB_PROGRESS:
2ff7e61e 5617 return btrfs_ioctl_scrub_progress(fs_info, argp);
c9e9f97b 5618 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 5619 return btrfs_ioctl_balance(file, argp);
837d5b6e 5620 case BTRFS_IOC_BALANCE_CTL:
2ff7e61e 5621 return btrfs_ioctl_balance_ctl(fs_info, arg);
19a39dce 5622 case BTRFS_IOC_BALANCE_PROGRESS:
2ff7e61e 5623 return btrfs_ioctl_balance_progress(fs_info, argp);
8ea05e3a
AB		 5624 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5625 return btrfs_ioctl_set_received_subvol(file, argp);
abccd00f
HM		 5626#ifdef CONFIG_64BIT
5627 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5628 return btrfs_ioctl_set_received_subvol_32(file, argp);
5629#endif
31db9f7c 5630 case BTRFS_IOC_SEND:
2351f431
JB		 5631 return _btrfs_ioctl_send(file, argp, false);
5632#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5633 case BTRFS_IOC_SEND_32:
5634 return _btrfs_ioctl_send(file, argp, true);
5635#endif
c11d2c23 5636 case BTRFS_IOC_GET_DEV_STATS:
2ff7e61e 5637 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5d13a37b 5638 case BTRFS_IOC_QUOTA_CTL:
905b0dda 5639 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 5640 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 5641 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 5642 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 5643 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 5644 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 5645 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 5646 case BTRFS_IOC_QUOTA_RESCAN:
5647 return btrfs_ioctl_quota_rescan(file, argp);
5648 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5649 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 5650 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5651 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd 5652 case BTRFS_IOC_DEV_REPLACE:
2ff7e61e 5653 return btrfs_ioctl_dev_replace(fs_info, argp);
867ab667 5654 case BTRFS_IOC_GET_FSLABEL:
5655 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 5656 case BTRFS_IOC_SET_FSLABEL:
5657 return btrfs_ioctl_set_fslabel(file, argp);
2eaa055f 5658 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
d5131b65 5659 return btrfs_ioctl_get_supported_features(argp);
2eaa055f
JM		 5660 case BTRFS_IOC_GET_FEATURES:
5661 return btrfs_ioctl_get_features(file, argp);
5662 case BTRFS_IOC_SET_FEATURES:
5663 return btrfs_ioctl_set_features(file, argp);
e4202ac9
DS		 5664 case FS_IOC_FSGETXATTR:
5665 return btrfs_ioctl_fsgetxattr(file, argp);
025f2121
DS		 5666 case FS_IOC_FSSETXATTR:
5667 return btrfs_ioctl_fssetxattr(file, argp);
b64ec075
TM		 5668 case BTRFS_IOC_GET_SUBVOL_INFO:
5669 return btrfs_ioctl_get_subvol_info(file, argp);
42e4b520
TM		 5670 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5671 return btrfs_ioctl_get_subvol_rootref(file, argp);
23d0b79d
TM		 5672 case BTRFS_IOC_INO_LOOKUP_USER:
5673 return btrfs_ioctl_ino_lookup_user(file, argp);
f46b5a66
CH		 5674 }
5675
5676 return -ENOTTY;
5677}
4c63c245
LD		 5678
5679#ifdef CONFIG_COMPAT
5680long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5681{
2a362249
JM		 5682 /*
5683 * These all access 32-bit values anyway so no further
5684 * handling is necessary.
5685 */
4c63c245
LD		 5686 switch (cmd) {
5687 case FS_IOC32_GETFLAGS:
5688 cmd = FS_IOC_GETFLAGS;
5689 break;
5690 case FS_IOC32_SETFLAGS:
5691 cmd = FS_IOC_SETFLAGS;
5692 break;
5693 case FS_IOC32_GETVERSION:
5694 cmd = FS_IOC_GETVERSION;
5695 break;
4c63c245
LD		 5696 }
5697
5698 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
5699}
5700#endif
Linux 6.x block layer and io_uring tree(s)