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btrfs: use bool argument in free_root_pointers()
[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"
8719aaae 46#include "space-info.h"
86736342 47#include "delalloc-space.h"
aac0023c 48#include "block-group.h"
f46b5a66 49
abccd00f
HM		 50#ifdef CONFIG_64BIT
51/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
52 * structures are incorrect, as the timespec structure from userspace
53 * is 4 bytes too small. We define these alternatives here to teach
54 * the kernel about the 32-bit struct packing.
55 */
56struct btrfs_ioctl_timespec_32 {
57 __u64 sec;
58 __u32 nsec;
59} __attribute__ ((__packed__));
60
61struct btrfs_ioctl_received_subvol_args_32 {
62 char uuid[BTRFS_UUID_SIZE]; /* in */
63 __u64 stransid; /* in */
64 __u64 rtransid; /* out */
65 struct btrfs_ioctl_timespec_32 stime; /* in */
66 struct btrfs_ioctl_timespec_32 rtime; /* out */
67 __u64 flags; /* in */
68 __u64 reserved[16]; /* in */
69} __attribute__ ((__packed__));
70
71#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
72 struct btrfs_ioctl_received_subvol_args_32)
73#endif
74
2351f431
JB		 75#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
76struct btrfs_ioctl_send_args_32 {
77 __s64 send_fd; /* in */
78 __u64 clone_sources_count; /* in */
79 compat_uptr_t clone_sources; /* in */
80 __u64 parent_root; /* in */
81 __u64 flags; /* in */
82 __u64 reserved[4]; /* in */
83} __attribute__ ((__packed__));
84
85#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
86 struct btrfs_ioctl_send_args_32)
87#endif
abccd00f 88
416161db 89static int btrfs_clone(struct inode *src, struct inode *inode,
1c919a5e
MF		 90 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
91 int no_time_update);
416161db 92
6cbff00f 93/* Mask out flags that are inappropriate for the given type of inode. */
1905a0f7
DS		 94static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
95 unsigned int flags)
6cbff00f 96{
1905a0f7 97 if (S_ISDIR(inode->i_mode))
6cbff00f 98 return flags;
1905a0f7 99 else if (S_ISREG(inode->i_mode))
6cbff00f
CH		 100 return flags & ~FS_DIRSYNC_FL;
101 else
102 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
103}
104
105/*
a157d4fd
DS		 106 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
107 * ioctl.
6cbff00f 108 */
a157d4fd 109static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
6cbff00f
CH		 110{
111 unsigned int iflags = 0;
112
113 if (flags & BTRFS_INODE_SYNC)
114 iflags |= FS_SYNC_FL;
115 if (flags & BTRFS_INODE_IMMUTABLE)
116 iflags |= FS_IMMUTABLE_FL;
117 if (flags & BTRFS_INODE_APPEND)
118 iflags |= FS_APPEND_FL;
119 if (flags & BTRFS_INODE_NODUMP)
120 iflags |= FS_NODUMP_FL;
121 if (flags & BTRFS_INODE_NOATIME)
122 iflags |= FS_NOATIME_FL;
123 if (flags & BTRFS_INODE_DIRSYNC)
124 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 125 if (flags & BTRFS_INODE_NODATACOW)
126 iflags |= FS_NOCOW_FL;
127
13f48dc9 128 if (flags & BTRFS_INODE_NOCOMPRESS)
d0092bdd 129 iflags |= FS_NOCOMP_FL;
13f48dc9
ST		 130 else if (flags & BTRFS_INODE_COMPRESS)
131 iflags |= FS_COMPR_FL;
6cbff00f
CH		 132
133 return iflags;
134}
135
136/*
137 * Update inode->i_flags based on the btrfs internal flags.
138 */
7b6a221e 139void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
6cbff00f 140{
5c57b8b6 141 struct btrfs_inode *binode = BTRFS_I(inode);
3cc79392 142 unsigned int new_fl = 0;
6cbff00f 143
5c57b8b6 144 if (binode->flags & BTRFS_INODE_SYNC)
3cc79392 145 new_fl |= S_SYNC;
5c57b8b6 146 if (binode->flags & BTRFS_INODE_IMMUTABLE)
3cc79392 147 new_fl |= S_IMMUTABLE;
5c57b8b6 148 if (binode->flags & BTRFS_INODE_APPEND)
3cc79392 149 new_fl |= S_APPEND;
5c57b8b6 150 if (binode->flags & BTRFS_INODE_NOATIME)
3cc79392 151 new_fl |= S_NOATIME;
5c57b8b6 152 if (binode->flags & BTRFS_INODE_DIRSYNC)
3cc79392
FM		 153 new_fl |= S_DIRSYNC;
154
155 set_mask_bits(&inode->i_flags,
156 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
157 new_fl);
6cbff00f
CH		 158}
159
6cbff00f
CH		 160static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
161{
5c57b8b6
DS		 162 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
163 unsigned int flags = btrfs_inode_flags_to_fsflags(binode->flags);
6cbff00f
CH		 164
165 if (copy_to_user(arg, &flags, sizeof(flags)))
166 return -EFAULT;
167 return 0;
168}
169
5ba76abf
DS		 170/* Check if @flags are a supported and valid set of FS_*_FL flags */
171static int check_fsflags(unsigned int flags)
75e7cb7f
LB		 172{
173 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
174 FS_NOATIME_FL | FS_NODUMP_FL | \
175 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 176 FS_NOCOMP_FL | FS_COMPR_FL |
177 FS_NOCOW_FL))
75e7cb7f
LB		 178 return -EOPNOTSUPP;
179
180 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
181 return -EINVAL;
182
75e7cb7f
LB		 183 return 0;
184}
185
6cbff00f
CH		 186static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
187{
496ad9aa 188 struct inode *inode = file_inode(file);
0b246afa 189 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5c57b8b6
DS		 190 struct btrfs_inode *binode = BTRFS_I(inode);
191 struct btrfs_root *root = binode->root;
6cbff00f 192 struct btrfs_trans_handle *trans;
5aca2842 193 unsigned int fsflags, old_fsflags;
6cbff00f 194 int ret;
ff9fef55 195 const char *comp = NULL;
d2b8fcfe 196 u32 binode_flags = binode->flags;
6cbff00f 197
bd60ea0f
DS		 198 if (!inode_owner_or_capable(inode))
199 return -EPERM;
200
b83cc969
LZ		 201 if (btrfs_root_readonly(root))
202 return -EROFS;
203
5c57b8b6 204 if (copy_from_user(&fsflags, arg, sizeof(fsflags)))
6cbff00f
CH		 205 return -EFAULT;
206
5c57b8b6 207 ret = check_fsflags(fsflags);
75e7cb7f
LB		 208 if (ret)
209 return ret;
f46b5a66 210
e7848683
JK		 211 ret = mnt_want_write_file(file);
212 if (ret)
213 return ret;
214
5955102c 215 inode_lock(inode);
6cbff00f 216
5c57b8b6 217 fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
5aca2842
DW		 218 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
219 ret = vfs_ioc_setflags_prepare(inode, old_fsflags, fsflags);
220 if (ret)
221 goto out_unlock;
6cbff00f 222
5c57b8b6 223 if (fsflags & FS_SYNC_FL)
d2b8fcfe 224 binode_flags |= BTRFS_INODE_SYNC;
6cbff00f 225 else
d2b8fcfe 226 binode_flags &= ~BTRFS_INODE_SYNC;
5c57b8b6 227 if (fsflags & FS_IMMUTABLE_FL)
d2b8fcfe 228 binode_flags |= BTRFS_INODE_IMMUTABLE;
6cbff00f 229 else
d2b8fcfe 230 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
5c57b8b6 231 if (fsflags & FS_APPEND_FL)
d2b8fcfe 232 binode_flags |= BTRFS_INODE_APPEND;
6cbff00f 233 else
d2b8fcfe 234 binode_flags &= ~BTRFS_INODE_APPEND;
5c57b8b6 235 if (fsflags & FS_NODUMP_FL)
d2b8fcfe 236 binode_flags |= BTRFS_INODE_NODUMP;
6cbff00f 237 else
d2b8fcfe 238 binode_flags &= ~BTRFS_INODE_NODUMP;
5c57b8b6 239 if (fsflags & FS_NOATIME_FL)
d2b8fcfe 240 binode_flags |= BTRFS_INODE_NOATIME;
6cbff00f 241 else
d2b8fcfe 242 binode_flags &= ~BTRFS_INODE_NOATIME;
5c57b8b6 243 if (fsflags & FS_DIRSYNC_FL)
d2b8fcfe 244 binode_flags |= BTRFS_INODE_DIRSYNC;
6cbff00f 245 else
d2b8fcfe 246 binode_flags &= ~BTRFS_INODE_DIRSYNC;
5c57b8b6 247 if (fsflags & FS_NOCOW_FL) {
44e5194b 248 if (S_ISREG(inode->i_mode)) {
7e97b8da
DS		 249 /*
250 * It's safe to turn csums off here, no extents exist.
251 * Otherwise we want the flag to reflect the real COW
252 * status of the file and will not set it.
253 */
254 if (inode->i_size == 0)
d2b8fcfe
AJ		 255 binode_flags |= BTRFS_INODE_NODATACOW |
256 BTRFS_INODE_NODATASUM;
7e97b8da 257 } else {
d2b8fcfe 258 binode_flags |= BTRFS_INODE_NODATACOW;
7e97b8da
DS		 259 }
260 } else {
261 /*
01327610 262 * Revert back under same assumptions as above
7e97b8da 263 */
44e5194b 264 if (S_ISREG(inode->i_mode)) {
7e97b8da 265 if (inode->i_size == 0)
d2b8fcfe
AJ		 266 binode_flags &= ~(BTRFS_INODE_NODATACOW |
267 BTRFS_INODE_NODATASUM);
7e97b8da 268 } else {
d2b8fcfe 269 binode_flags &= ~BTRFS_INODE_NODATACOW;
7e97b8da
DS		 270 }
271 }
6cbff00f 272
75e7cb7f
LB		 273 /*
274 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
275 * flag may be changed automatically if compression code won't make
276 * things smaller.
277 */
5c57b8b6 278 if (fsflags & FS_NOCOMP_FL) {
d2b8fcfe
AJ		 279 binode_flags &= ~BTRFS_INODE_COMPRESS;
280 binode_flags |= BTRFS_INODE_NOCOMPRESS;
5c57b8b6 281 } else if (fsflags & FS_COMPR_FL) {
63541927 282
eede2bf3
OS		 283 if (IS_SWAPFILE(inode)) {
284 ret = -ETXTBSY;
285 goto out_unlock;
286 }
287
d2b8fcfe
AJ		 288 binode_flags |= BTRFS_INODE_COMPRESS;
289 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
63541927 290
93370509
DS		 291 comp = btrfs_compress_type2str(fs_info->compress_type);
292 if (!comp || comp[0] == 0)
293 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
ebcb904d 294 } else {
d2b8fcfe 295 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 296 }
6cbff00f 297
ff9fef55
AJ		 298 /*
299 * 1 for inode item
300 * 2 for properties
301 */
302 trans = btrfs_start_transaction(root, 3);
f062abf0
LZ		 303 if (IS_ERR(trans)) {
304 ret = PTR_ERR(trans);
d2b8fcfe 305 goto out_unlock;
f062abf0 306 }
6cbff00f 307
ff9fef55
AJ		 308 if (comp) {
309 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
310 strlen(comp), 0);
311 if (ret) {
312 btrfs_abort_transaction(trans, ret);
313 goto out_end_trans;
314 }
ff9fef55
AJ		 315 } else {
316 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
317 0, 0);
318 if (ret && ret != -ENODATA) {
319 btrfs_abort_transaction(trans, ret);
320 goto out_end_trans;
321 }
322 }
323
d2b8fcfe 324 binode->flags = binode_flags;
7b6a221e 325 btrfs_sync_inode_flags_to_i_flags(inode);
0c4d2d95 326 inode_inc_iversion(inode);
c2050a45 327 inode->i_ctime = current_time(inode);
6cbff00f 328 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 329
ff9fef55 330 out_end_trans:
3a45bb20 331 btrfs_end_transaction(trans);
6cbff00f 332 out_unlock:
5955102c 333 inode_unlock(inode);
e7848683 334 mnt_drop_write_file(file);
2d4e6f6a 335 return ret;
6cbff00f
CH		 336}
337
19f93b3c
DS		 338/*
339 * Translate btrfs internal inode flags to xflags as expected by the
340 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
341 * silently dropped.
342 */
343static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
344{
345 unsigned int xflags = 0;
346
347 if (flags & BTRFS_INODE_APPEND)
348 xflags |= FS_XFLAG_APPEND;
349 if (flags & BTRFS_INODE_IMMUTABLE)
350 xflags |= FS_XFLAG_IMMUTABLE;
351 if (flags & BTRFS_INODE_NOATIME)
352 xflags |= FS_XFLAG_NOATIME;
353 if (flags & BTRFS_INODE_NODUMP)
354 xflags |= FS_XFLAG_NODUMP;
355 if (flags & BTRFS_INODE_SYNC)
356 xflags |= FS_XFLAG_SYNC;
357
358 return xflags;
359}
360
361/* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
362static int check_xflags(unsigned int flags)
363{
364 if (flags & ~(FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE | FS_XFLAG_NOATIME |
365 FS_XFLAG_NODUMP | FS_XFLAG_SYNC))
366 return -EOPNOTSUPP;
367 return 0;
368}
369
e4202ac9
DS		 370/*
371 * Set the xflags from the internal inode flags. The remaining items of fsxattr
372 * are zeroed.
373 */
374static int btrfs_ioctl_fsgetxattr(struct file *file, void __user *arg)
375{
376 struct btrfs_inode *binode = BTRFS_I(file_inode(file));
377 struct fsxattr fa;
378
7b0e492e 379 simple_fill_fsxattr(&fa, btrfs_inode_flags_to_xflags(binode->flags));
e4202ac9
DS		 380 if (copy_to_user(arg, &fa, sizeof(fa)))
381 return -EFAULT;
382
383 return 0;
384}
385
025f2121
DS		 386static int btrfs_ioctl_fssetxattr(struct file *file, void __user *arg)
387{
388 struct inode *inode = file_inode(file);
389 struct btrfs_inode *binode = BTRFS_I(inode);
390 struct btrfs_root *root = binode->root;
391 struct btrfs_trans_handle *trans;
7b0e492e 392 struct fsxattr fa, old_fa;
025f2121
DS		 393 unsigned old_flags;
394 unsigned old_i_flags;
395 int ret = 0;
396
397 if (!inode_owner_or_capable(inode))
398 return -EPERM;
399
400 if (btrfs_root_readonly(root))
401 return -EROFS;
402
025f2121
DS		 403 if (copy_from_user(&fa, arg, sizeof(fa)))
404 return -EFAULT;
405
406 ret = check_xflags(fa.fsx_xflags);
407 if (ret)
408 return ret;
409
410 if (fa.fsx_extsize != 0 || fa.fsx_projid != 0 || fa.fsx_cowextsize != 0)
411 return -EOPNOTSUPP;
412
413 ret = mnt_want_write_file(file);
414 if (ret)
415 return ret;
416
417 inode_lock(inode);
418
419 old_flags = binode->flags;
420 old_i_flags = inode->i_flags;
421
7b0e492e
DW		 422 simple_fill_fsxattr(&old_fa,
423 btrfs_inode_flags_to_xflags(binode->flags));
424 ret = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
425 if (ret)
025f2121 426 goto out_unlock;
025f2121
DS		 427
428 if (fa.fsx_xflags & FS_XFLAG_SYNC)
429 binode->flags |= BTRFS_INODE_SYNC;
430 else
431 binode->flags &= ~BTRFS_INODE_SYNC;
432 if (fa.fsx_xflags & FS_XFLAG_IMMUTABLE)
433 binode->flags |= BTRFS_INODE_IMMUTABLE;
434 else
435 binode->flags &= ~BTRFS_INODE_IMMUTABLE;
436 if (fa.fsx_xflags & FS_XFLAG_APPEND)
437 binode->flags |= BTRFS_INODE_APPEND;
438 else
439 binode->flags &= ~BTRFS_INODE_APPEND;
440 if (fa.fsx_xflags & FS_XFLAG_NODUMP)
441 binode->flags |= BTRFS_INODE_NODUMP;
442 else
443 binode->flags &= ~BTRFS_INODE_NODUMP;
444 if (fa.fsx_xflags & FS_XFLAG_NOATIME)
445 binode->flags |= BTRFS_INODE_NOATIME;
446 else
447 binode->flags &= ~BTRFS_INODE_NOATIME;
448
449 /* 1 item for the inode */
450 trans = btrfs_start_transaction(root, 1);
451 if (IS_ERR(trans)) {
452 ret = PTR_ERR(trans);
453 goto out_unlock;
454 }
455
456 btrfs_sync_inode_flags_to_i_flags(inode);
457 inode_inc_iversion(inode);
458 inode->i_ctime = current_time(inode);
459 ret = btrfs_update_inode(trans, root, inode);
460
461 btrfs_end_transaction(trans);
462
463out_unlock:
464 if (ret) {
465 binode->flags = old_flags;
466 inode->i_flags = old_i_flags;
467 }
468
469 inode_unlock(inode);
470 mnt_drop_write_file(file);
471
472 return ret;
473}
474
6cbff00f
CH		 475static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
476{
496ad9aa 477 struct inode *inode = file_inode(file);
6cbff00f
CH		 478
479 return put_user(inode->i_generation, arg);
480}
f46b5a66 481
f7039b1d
LD		 482static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
483{
0b246afa
JM		 484 struct inode *inode = file_inode(file);
485 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f7039b1d
LD		 486 struct btrfs_device *device;
487 struct request_queue *q;
488 struct fstrim_range range;
489 u64 minlen = ULLONG_MAX;
490 u64 num_devices = 0;
491 int ret;
492
493 if (!capable(CAP_SYS_ADMIN))
494 return -EPERM;
495
f35f06c3
FM		 496 /*
497 * If the fs is mounted with nologreplay, which requires it to be
498 * mounted in RO mode as well, we can not allow discard on free space
499 * inside block groups, because log trees refer to extents that are not
500 * pinned in a block group's free space cache (pinning the extents is
501 * precisely the first phase of replaying a log tree).
502 */
503 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
504 return -EROFS;
505
1f78160c
XG		 506 rcu_read_lock();
507 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
508 dev_list) {
f7039b1d
LD		 509 if (!device->bdev)
510 continue;
511 q = bdev_get_queue(device->bdev);
512 if (blk_queue_discard(q)) {
513 num_devices++;
50d0446e 514 minlen = min_t(u64, q->limits.discard_granularity,
f7039b1d
LD		 515 minlen);
516 }
517 }
1f78160c 518 rcu_read_unlock();
f4c697e6 519
f7039b1d
LD		 520 if (!num_devices)
521 return -EOPNOTSUPP;
f7039b1d
LD		 522 if (copy_from_user(&range, arg, sizeof(range)))
523 return -EFAULT;
6ba9fc8e
QW		 524
525 /*
526 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
527 * block group is in the logical address space, which can be any
528 * sectorsize aligned bytenr in the range [0, U64_MAX].
529 */
530 if (range.len < fs_info->sb->s_blocksize)
f4c697e6 531 return -EINVAL;
f7039b1d
LD		 532
533 range.minlen = max(range.minlen, minlen);
2ff7e61e 534 ret = btrfs_trim_fs(fs_info, &range);
f7039b1d
LD		 535 if (ret < 0)
536 return ret;
537
538 if (copy_to_user(arg, &range, sizeof(range)))
539 return -EFAULT;
540
541 return 0;
542}
543
e1f60a65 544int __pure btrfs_is_empty_uuid(u8 *uuid)
dd5f9615 545{
46e0f66a
CM		 546 int i;
547
548 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
549 if (uuid[i])
550 return 0;
551 }
552 return 1;
dd5f9615
SB		 553}
554
d5c12070 555static noinline int create_subvol(struct inode *dir,
cb8e7090 556 struct dentry *dentry,
52f75f4f 557 const char *name, int namelen,
6f72c7e2 558 u64 *async_transid,
8696c533 559 struct btrfs_qgroup_inherit *inherit)
f46b5a66 560{
0b246afa 561 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
f46b5a66
CH		 562 struct btrfs_trans_handle *trans;
563 struct btrfs_key key;
49a3c4d9 564 struct btrfs_root_item *root_item;
f46b5a66
CH		 565 struct btrfs_inode_item *inode_item;
566 struct extent_buffer *leaf;
d5c12070 567 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 568 struct btrfs_root *new_root;
d5c12070 569 struct btrfs_block_rsv block_rsv;
95582b00 570 struct timespec64 cur_time = current_time(dir);
5662344b 571 struct inode *inode;
f46b5a66
CH		 572 int ret;
573 int err;
574 u64 objectid;
575 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 576 u64 index = 0;
8ea05e3a 577 uuid_le new_uuid;
f46b5a66 578
49a3c4d9
DS		 579 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
580 if (!root_item)
581 return -ENOMEM;
582
0b246afa 583 ret = btrfs_find_free_objectid(fs_info->tree_root, &objectid);
2fbe8c8a 584 if (ret)
49a3c4d9 585 goto fail_free;
6a912213 586
e09fe2d2
QW		 587 /*
588 * Don't create subvolume whose level is not zero. Or qgroup will be
01327610 589 * screwed up since it assumes subvolume qgroup's level to be 0.
e09fe2d2 590 */
49a3c4d9
DS		 591 if (btrfs_qgroup_level(objectid)) {
592 ret = -ENOSPC;
593 goto fail_free;
594 }
e09fe2d2 595
d5c12070 596 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 597 /*
d5c12070
MX		 598 * The same as the snapshot creation, please see the comment
599 * of create_snapshot().
9ed74f2d 600 */
c4c129db 601 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
d5c12070 602 if (ret)
49a3c4d9 603 goto fail_free;
d5c12070
MX		 604
605 trans = btrfs_start_transaction(root, 0);
606 if (IS_ERR(trans)) {
607 ret = PTR_ERR(trans);
7775c818 608 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
49a3c4d9 609 goto fail_free;
d5c12070
MX		 610 }
611 trans->block_rsv = &block_rsv;
612 trans->bytes_reserved = block_rsv.size;
f46b5a66 613
a9377422 614 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
6f72c7e2
AJ		 615 if (ret)
616 goto fail;
617
4d75f8a9 618 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 619 if (IS_ERR(leaf)) {
620 ret = PTR_ERR(leaf);
621 goto fail;
622 }
f46b5a66 623
f46b5a66
CH		 624 btrfs_mark_buffer_dirty(leaf);
625
49a3c4d9 626 inode_item = &root_item->inode;
3cae210f
QW		 627 btrfs_set_stack_inode_generation(inode_item, 1);
628 btrfs_set_stack_inode_size(inode_item, 3);
629 btrfs_set_stack_inode_nlink(inode_item, 1);
da17066c 630 btrfs_set_stack_inode_nbytes(inode_item,
0b246afa 631 fs_info->nodesize);
3cae210f 632 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
f46b5a66 633
49a3c4d9
DS		 634 btrfs_set_root_flags(root_item, 0);
635 btrfs_set_root_limit(root_item, 0);
3cae210f 636 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
08fe4db1 637
49a3c4d9
DS		 638 btrfs_set_root_bytenr(root_item, leaf->start);
639 btrfs_set_root_generation(root_item, trans->transid);
640 btrfs_set_root_level(root_item, 0);
641 btrfs_set_root_refs(root_item, 1);
642 btrfs_set_root_used(root_item, leaf->len);
643 btrfs_set_root_last_snapshot(root_item, 0);
f46b5a66 644
49a3c4d9
DS		 645 btrfs_set_root_generation_v2(root_item,
646 btrfs_root_generation(root_item));
8ea05e3a 647 uuid_le_gen(&new_uuid);
49a3c4d9
DS		 648 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
649 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
650 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
651 root_item->ctime = root_item->otime;
652 btrfs_set_root_ctransid(root_item, trans->transid);
653 btrfs_set_root_otransid(root_item, trans->transid);
f46b5a66 654
925baedd 655 btrfs_tree_unlock(leaf);
f46b5a66
CH		 656 free_extent_buffer(leaf);
657 leaf = NULL;
658
49a3c4d9 659 btrfs_set_root_dirid(root_item, new_dirid);
f46b5a66
CH		 660
661 key.objectid = objectid;
5d4f98a2 662 key.offset = 0;
962a298f 663 key.type = BTRFS_ROOT_ITEM_KEY;
0b246afa 664 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
49a3c4d9 665 root_item);
f46b5a66
CH		 666 if (ret)
667 goto fail;
668
76dda93c 669 key.offset = (u64)-1;
0b246afa 670 new_root = btrfs_read_fs_root_no_name(fs_info, &key);
79787eaa 671 if (IS_ERR(new_root)) {
79787eaa 672 ret = PTR_ERR(new_root);
66642832 673 btrfs_abort_transaction(trans, ret);
79787eaa
JM		 674 goto fail;
675 }
76dda93c
YZ		 676
677 btrfs_record_root_in_trans(trans, new_root);
678
63541927 679 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
ce598979
MF		 680 if (ret) {
681 /* We potentially lose an unused inode item here */
66642832 682 btrfs_abort_transaction(trans, ret);
ce598979
MF		 683 goto fail;
684 }
685
f32e48e9
CR		 686 mutex_lock(&new_root->objectid_mutex);
687 new_root->highest_objectid = new_dirid;
688 mutex_unlock(&new_root->objectid_mutex);
689
f46b5a66
CH		 690 /*
691 * insert the directory item
692 */
877574e2 693 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
79787eaa 694 if (ret) {
66642832 695 btrfs_abort_transaction(trans, ret);
79787eaa
JM		 696 goto fail;
697 }
3de4586c 698
684572df 699 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
3de4586c 700 BTRFS_FT_DIR, index);
79787eaa 701 if (ret) {
66642832 702 btrfs_abort_transaction(trans, ret);
f46b5a66 703 goto fail;
79787eaa 704 }
0660b5af 705
6ef06d27 706 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
52c26179
YZ		 707 ret = btrfs_update_inode(trans, root, dir);
708 BUG_ON(ret);
709
6025c19f 710 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
4a0cc7ca 711 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
76dda93c 712 BUG_ON(ret);
f46b5a66 713
cdb345a8 714 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
6bccf3ab 715 BTRFS_UUID_KEY_SUBVOL, objectid);
dd5f9615 716 if (ret)
66642832 717 btrfs_abort_transaction(trans, ret);
dd5f9615 718
f46b5a66 719fail:
49a3c4d9 720 kfree(root_item);
d5c12070
MX		 721 trans->block_rsv = NULL;
722 trans->bytes_reserved = 0;
7775c818 723 btrfs_subvolume_release_metadata(fs_info, &block_rsv);
de6e8200 724
72fd032e
SW		 725 if (async_transid) {
726 *async_transid = trans->transid;
3a45bb20 727 err = btrfs_commit_transaction_async(trans, 1);
00d71c9c 728 if (err)
3a45bb20 729 err = btrfs_commit_transaction(trans);
72fd032e 730 } else {
3a45bb20 731 err = btrfs_commit_transaction(trans);
72fd032e 732 }
f46b5a66
CH		 733 if (err && !ret)
734 ret = err;
1a65e24b 735
5662344b
TI		 736 if (!ret) {
737 inode = btrfs_lookup_dentry(dir, dentry);
de6e8200
LB		 738 if (IS_ERR(inode))
739 return PTR_ERR(inode);
5662344b
TI		 740 d_instantiate(dentry, inode);
741 }
f46b5a66 742 return ret;
49a3c4d9
DS		 743
744fail_free:
745 kfree(root_item);
746 return ret;
f46b5a66
CH		 747}
748
e9662f70 749static int create_snapshot(struct btrfs_root *root, struct inode *dir,
61d7e4cb 750 struct dentry *dentry,
e9662f70
MX		 751 u64 *async_transid, bool readonly,
752 struct btrfs_qgroup_inherit *inherit)
f46b5a66 753{
0b246afa 754 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
2e4bfab9 755 struct inode *inode;
f46b5a66
CH		 756 struct btrfs_pending_snapshot *pending_snapshot;
757 struct btrfs_trans_handle *trans;
2e4bfab9 758 int ret;
8ecebf4d 759 bool snapshot_force_cow = false;
f46b5a66 760
27cdeb70 761 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
f46b5a66
CH		 762 return -EINVAL;
763
eede2bf3
OS		 764 if (atomic_read(&root->nr_swapfiles)) {
765 btrfs_warn(fs_info,
766 "cannot snapshot subvolume with active swapfile");
767 return -ETXTBSY;
768 }
769
23269bf5 770 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
a1ee7362
DS		 771 if (!pending_snapshot)
772 return -ENOMEM;
773
b0c0ea63 774 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
23269bf5 775 GFP_KERNEL);
8546b570
DS		 776 pending_snapshot->path = btrfs_alloc_path();
777 if (!pending_snapshot->root_item || !pending_snapshot->path) {
b0c0ea63
DS		 778 ret = -ENOMEM;
779 goto free_pending;
780 }
781
8ecebf4d
RK		 782 /*
783 * Force new buffered writes to reserve space even when NOCOW is
784 * possible. This is to avoid later writeback (running dealloc) to
785 * fallback to COW mode and unexpectedly fail with ENOSPC.
786 */
ea14b57f 787 atomic_inc(&root->will_be_snapshotted);
4e857c58 788 smp_mb__after_atomic();
45bac0f3
LB		 789 /* wait for no snapshot writes */
790 wait_event(root->subv_writers->wait,
791 percpu_counter_sum(&root->subv_writers->counter) == 0);
8257b2dc 792
3cd24c69 793 ret = btrfs_start_delalloc_snapshot(root);
6a03843d 794 if (ret)
a1ee7362 795 goto dec_and_free;
6a03843d 796
8ecebf4d
RK		 797 /*
798 * All previous writes have started writeback in NOCOW mode, so now
799 * we force future writes to fallback to COW mode during snapshot
800 * creation.
801 */
802 atomic_inc(&root->snapshot_force_cow);
803 snapshot_force_cow = true;
804
6374e57a 805 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
6a03843d 806
66d8f3dd
MX		 807 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
808 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 809 /*
810 * 1 - parent dir inode
811 * 2 - dir entries
812 * 1 - root item
813 * 2 - root ref/backref
814 * 1 - root of snapshot
dd5f9615 815 * 1 - UUID item
d5c12070
MX		 816 */
817 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
dd5f9615 818 &pending_snapshot->block_rsv, 8,
ee3441b4 819 false);
d5c12070 820 if (ret)
a1ee7362 821 goto dec_and_free;
d5c12070 822
3de4586c 823 pending_snapshot->dentry = dentry;
f46b5a66 824 pending_snapshot->root = root;
b83cc969 825 pending_snapshot->readonly = readonly;
e9662f70 826 pending_snapshot->dir = dir;
8696c533 827 pending_snapshot->inherit = inherit;
a22285a6 828
d5c12070 829 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 830 if (IS_ERR(trans)) {
831 ret = PTR_ERR(trans);
832 goto fail;
833 }
834
0b246afa 835 spin_lock(&fs_info->trans_lock);
f46b5a66
CH		 836 list_add(&pending_snapshot->list,
837 &trans->transaction->pending_snapshots);
0b246afa 838 spin_unlock(&fs_info->trans_lock);
72fd032e
SW		 839 if (async_transid) {
840 *async_transid = trans->transid;
3a45bb20 841 ret = btrfs_commit_transaction_async(trans, 1);
00d71c9c 842 if (ret)
3a45bb20 843 ret = btrfs_commit_transaction(trans);
72fd032e 844 } else {
3a45bb20 845 ret = btrfs_commit_transaction(trans);
72fd032e 846 }
aec8030a 847 if (ret)
c37b2b62 848 goto fail;
a22285a6
YZ		 849
850 ret = pending_snapshot->error;
851 if (ret)
852 goto fail;
853
d3797308
CM		 854 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
855 if (ret)
856 goto fail;
857
2b0143b5 858 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
2e4bfab9
YZ		 859 if (IS_ERR(inode)) {
860 ret = PTR_ERR(inode);
861 goto fail;
862 }
5662344b 863
2e4bfab9
YZ		 864 d_instantiate(dentry, inode);
865 ret = 0;
866fail:
7775c818 867 btrfs_subvolume_release_metadata(fs_info, &pending_snapshot->block_rsv);
a1ee7362 868dec_and_free:
8ecebf4d
RK		 869 if (snapshot_force_cow)
870 atomic_dec(&root->snapshot_force_cow);
ea14b57f 871 if (atomic_dec_and_test(&root->will_be_snapshotted))
4625956a 872 wake_up_var(&root->will_be_snapshotted);
b0c0ea63
DS		 873free_pending:
874 kfree(pending_snapshot->root_item);
8546b570 875 btrfs_free_path(pending_snapshot->path);
a1ee7362
DS		 876 kfree(pending_snapshot);
877
f46b5a66
CH		 878 return ret;
879}
880
4260f7c7
SW		 881/* copy of may_delete in fs/namei.c()
882 * Check whether we can remove a link victim from directory dir, check
883 * whether the type of victim is right.
884 * 1. We can't do it if dir is read-only (done in permission())
885 * 2. We should have write and exec permissions on dir
886 * 3. We can't remove anything from append-only dir
887 * 4. We can't do anything with immutable dir (done in permission())
888 * 5. If the sticky bit on dir is set we should either
889 * a. be owner of dir, or
890 * b. be owner of victim, or
891 * c. have CAP_FOWNER capability
01327610 892 * 6. If the victim is append-only or immutable we can't do anything with
4260f7c7
SW		 893 * links pointing to it.
894 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
895 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
896 * 9. We can't remove a root or mountpoint.
897 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
898 * nfs_async_unlink().
899 */
900
67871254 901static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
4260f7c7
SW		 902{
903 int error;
904
2b0143b5 905 if (d_really_is_negative(victim))
4260f7c7
SW		 906 return -ENOENT;
907
2b0143b5 908 BUG_ON(d_inode(victim->d_parent) != dir);
4fa6b5ec 909 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 910
911 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
912 if (error)
913 return error;
914 if (IS_APPEND(dir))
915 return -EPERM;
2b0143b5
DH		 916 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
917 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
4260f7c7
SW		 918 return -EPERM;
919 if (isdir) {
e36cb0b8 920 if (!d_is_dir(victim))
4260f7c7
SW		 921 return -ENOTDIR;
922 if (IS_ROOT(victim))
923 return -EBUSY;
e36cb0b8 924 } else if (d_is_dir(victim))
4260f7c7
SW		 925 return -EISDIR;
926 if (IS_DEADDIR(dir))
927 return -ENOENT;
928 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
929 return -EBUSY;
930 return 0;
931}
932
cb8e7090
CH		 933/* copy of may_create in fs/namei.c() */
934static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
935{
2b0143b5 936 if (d_really_is_positive(child))
cb8e7090
CH		 937 return -EEXIST;
938 if (IS_DEADDIR(dir))
939 return -ENOENT;
940 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
941}
942
943/*
944 * Create a new subvolume below @parent. This is largely modeled after
945 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
946 * inside this filesystem so it's quite a bit simpler.
947 */
92872094 948static noinline int btrfs_mksubvol(const struct path *parent,
52f75f4f 949 const char *name, int namelen,
72fd032e 950 struct btrfs_root *snap_src,
6f72c7e2 951 u64 *async_transid, bool readonly,
8696c533 952 struct btrfs_qgroup_inherit *inherit)
cb8e7090 953{
0b246afa
JM		 954 struct inode *dir = d_inode(parent->dentry);
955 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
cb8e7090
CH		 956 struct dentry *dentry;
957 int error;
958
00235411
AV		 959 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
960 if (error == -EINTR)
961 return error;
cb8e7090
CH		 962
963 dentry = lookup_one_len(name, parent->dentry, namelen);
964 error = PTR_ERR(dentry);
965 if (IS_ERR(dentry))
966 goto out_unlock;
967
76dda93c 968 error = btrfs_may_create(dir, dentry);
cb8e7090 969 if (error)
a874a63e 970 goto out_dput;
cb8e7090 971
9c52057c
CM		 972 /*
973 * even if this name doesn't exist, we may get hash collisions.
974 * check for them now when we can safely fail
975 */
976 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
977 dir->i_ino, name,
978 namelen);
979 if (error)
980 goto out_dput;
981
0b246afa 982 down_read(&fs_info->subvol_sem);
76dda93c
YZ		 983
984 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
985 goto out_up_read;
986
3de4586c 987 if (snap_src) {
61d7e4cb 988 error = create_snapshot(snap_src, dir, dentry,
6f72c7e2 989 async_transid, readonly, inherit);
3de4586c 990 } else {
d5c12070
MX		 991 error = create_subvol(dir, dentry, name, namelen,
992 async_transid, inherit);
3de4586c 993 }
76dda93c
YZ		 994 if (!error)
995 fsnotify_mkdir(dir, dentry);
996out_up_read:
0b246afa 997 up_read(&fs_info->subvol_sem);
cb8e7090
CH		 998out_dput:
999 dput(dentry);
1000out_unlock:
5955102c 1001 inode_unlock(dir);
cb8e7090
CH		 1002 return error;
1003}
1004
4cb5300b
CM		 1005/*
1006 * When we're defragging a range, we don't want to kick it off again
1007 * if it is really just waiting for delalloc to send it down.
1008 * If we find a nice big extent or delalloc range for the bytes in the
1009 * file you want to defrag, we return 0 to let you know to skip this
1010 * part of the file
1011 */
aab110ab 1012static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
4cb5300b
CM		 1013{
1014 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1015 struct extent_map *em = NULL;
1016 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1017 u64 end;
1018
1019 read_lock(&em_tree->lock);
09cbfeaf 1020 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
4cb5300b
CM		 1021 read_unlock(&em_tree->lock);
1022
1023 if (em) {
1024 end = extent_map_end(em);
1025 free_extent_map(em);
1026 if (end - offset > thresh)
1027 return 0;
1028 }
1029 /* if we already have a nice delalloc here, just stop */
1030 thresh /= 2;
1031 end = count_range_bits(io_tree, &offset, offset + thresh,
1032 thresh, EXTENT_DELALLOC, 1);
1033 if (end >= thresh)
1034 return 0;
1035 return 1;
1036}
1037
1038/*
1039 * helper function to walk through a file and find extents
1040 * newer than a specific transid, and smaller than thresh.
1041 *
1042 * This is used by the defragging code to find new and small
1043 * extents
1044 */
1045static int find_new_extents(struct btrfs_root *root,
1046 struct inode *inode, u64 newer_than,
aab110ab 1047 u64 *off, u32 thresh)
4cb5300b
CM		 1048{
1049 struct btrfs_path *path;
1050 struct btrfs_key min_key;
4cb5300b
CM		 1051 struct extent_buffer *leaf;
1052 struct btrfs_file_extent_item *extent;
1053 int type;
1054 int ret;
4a0cc7ca 1055 u64 ino = btrfs_ino(BTRFS_I(inode));
4cb5300b
CM		 1056
1057 path = btrfs_alloc_path();
1058 if (!path)
1059 return -ENOMEM;
1060
a4689d2b 1061 min_key.objectid = ino;
4cb5300b
CM		 1062 min_key.type = BTRFS_EXTENT_DATA_KEY;
1063 min_key.offset = *off;
1064
67871254 1065 while (1) {
6174d3cb 1066 ret = btrfs_search_forward(root, &min_key, path, newer_than);
4cb5300b
CM		 1067 if (ret != 0)
1068 goto none;
f094c9bd 1069process_slot:
a4689d2b 1070 if (min_key.objectid != ino)
4cb5300b
CM		 1071 goto none;
1072 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1073 goto none;
1074
1075 leaf = path->nodes[0];
1076 extent = btrfs_item_ptr(leaf, path->slots[0],
1077 struct btrfs_file_extent_item);
1078
1079 type = btrfs_file_extent_type(leaf, extent);
1080 if (type == BTRFS_FILE_EXTENT_REG &&
1081 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1082 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1083 *off = min_key.offset;
1084 btrfs_free_path(path);
1085 return 0;
1086 }
1087
f094c9bd
FM		 1088 path->slots[0]++;
1089 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1090 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1091 goto process_slot;
1092 }
1093
4cb5300b
CM		 1094 if (min_key.offset == (u64)-1)
1095 goto none;
1096
1097 min_key.offset++;
1098 btrfs_release_path(path);
1099 }
1100none:
1101 btrfs_free_path(path);
1102 return -ENOENT;
1103}
1104
6c282eb4 1105static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 1106{
1107 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 1108 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1109 struct extent_map *em;
09cbfeaf 1110 u64 len = PAGE_SIZE;
17ce6ef8 1111
6c282eb4
LZ		 1112 /*
1113 * hopefully we have this extent in the tree already, try without
1114 * the full extent lock
1115 */
17ce6ef8 1116 read_lock(&em_tree->lock);
6c282eb4 1117 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 1118 read_unlock(&em_tree->lock);
1119
6c282eb4 1120 if (!em) {
308d9800
FM		 1121 struct extent_state *cached = NULL;
1122 u64 end = start + len - 1;
1123
6c282eb4 1124 /* get the big lock and read metadata off disk */
ff13db41 1125 lock_extent_bits(io_tree, start, end, &cached);
fc4f21b1 1126 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len, 0);
e43bbe5e 1127 unlock_extent_cached(io_tree, start, end, &cached);
6c282eb4
LZ		 1128
1129 if (IS_ERR(em))
1130 return NULL;
1131 }
1132
1133 return em;
1134}
17ce6ef8 1135
6c282eb4
LZ		 1136static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1137{
1138 struct extent_map *next;
1139 bool ret = true;
1140
1141 /* this is the last extent */
1142 if (em->start + em->len >= i_size_read(inode))
1143 return false;
1144
1145 next = defrag_lookup_extent(inode, em->start + em->len);
e9512d72
CM		 1146 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1147 ret = false;
1148 else if ((em->block_start + em->block_len == next->block_start) &&
ee22184b 1149 (em->block_len > SZ_128K && next->block_len > SZ_128K))
6c282eb4
LZ		 1150 ret = false;
1151
1152 free_extent_map(next);
17ce6ef8
LB		 1153 return ret;
1154}
1155
aab110ab 1156static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
a43a2111
AM		 1157 u64 *last_len, u64 *skip, u64 *defrag_end,
1158 int compress)
940100a4 1159{
6c282eb4 1160 struct extent_map *em;
940100a4 1161 int ret = 1;
6c282eb4 1162 bool next_mergeable = true;
4a3560c4 1163 bool prev_mergeable = true;
940100a4
CM		 1164
1165 /*
008873ea 1166 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 1167 * defragging it
1168 */
1169 if (start < *defrag_end)
1170 return 1;
1171
1172 *skip = 0;
1173
6c282eb4
LZ		 1174 em = defrag_lookup_extent(inode, start);
1175 if (!em)
1176 return 0;
940100a4
CM		 1177
1178 /* this will cover holes, and inline extents */
17ce6ef8 1179 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 1180 ret = 0;
17ce6ef8
LB		 1181 goto out;
1182 }
1183
4a3560c4
LB		 1184 if (!*defrag_end)
1185 prev_mergeable = false;
1186
6c282eb4 1187 next_mergeable = defrag_check_next_extent(inode, em);
940100a4 1188 /*
6c282eb4
LZ		 1189 * we hit a real extent, if it is big or the next extent is not a
1190 * real extent, don't bother defragging it
940100a4 1191 */
a43a2111 1192 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
4a3560c4 1193 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
940100a4 1194 ret = 0;
17ce6ef8 1195out:
940100a4
CM		 1196 /*
1197 * last_len ends up being a counter of how many bytes we've defragged.
1198 * every time we choose not to defrag an extent, we reset *last_len
1199 * so that the next tiny extent will force a defrag.
1200 *
1201 * The end result of this is that tiny extents before a single big
1202 * extent will force at least part of that big extent to be defragged.
1203 */
1204 if (ret) {
940100a4
CM		 1205 *defrag_end = extent_map_end(em);
1206 } else {
1207 *last_len = 0;
1208 *skip = extent_map_end(em);
1209 *defrag_end = 0;
1210 }
1211
1212 free_extent_map(em);
1213 return ret;
1214}
1215
4cb5300b
CM		 1216/*
1217 * it doesn't do much good to defrag one or two pages
1218 * at a time. This pulls in a nice chunk of pages
1219 * to COW and defrag.
1220 *
1221 * It also makes sure the delalloc code has enough
1222 * dirty data to avoid making new small extents as part
1223 * of the defrag
1224 *
1225 * It's a good idea to start RA on this range
1226 * before calling this.
1227 */
1228static int cluster_pages_for_defrag(struct inode *inode,
1229 struct page **pages,
1230 unsigned long start_index,
c41570c9 1231 unsigned long num_pages)
f46b5a66 1232{
4cb5300b
CM		 1233 unsigned long file_end;
1234 u64 isize = i_size_read(inode);
1235 u64 page_start;
1236 u64 page_end;
1f12bd06 1237 u64 page_cnt;
4cb5300b
CM		 1238 int ret;
1239 int i;
1240 int i_done;
3eaa2885 1241 struct btrfs_ordered_extent *ordered;
4cb5300b 1242 struct extent_state *cached_state = NULL;
600a45e1 1243 struct extent_io_tree *tree;
364ecf36 1244 struct extent_changeset *data_reserved = NULL;
3b16a4e3 1245 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1246
09cbfeaf 1247 file_end = (isize - 1) >> PAGE_SHIFT;
1f12bd06
LB		 1248 if (!isize || start_index > file_end)
1249 return 0;
1250
1251 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b 1252
364ecf36 1253 ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
09cbfeaf
KS		 1254 start_index << PAGE_SHIFT,
1255 page_cnt << PAGE_SHIFT);
4cb5300b
CM		 1256 if (ret)
1257 return ret;
4cb5300b 1258 i_done = 0;
600a45e1 1259 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1260
1261 /* step one, lock all the pages */
1f12bd06 1262 for (i = 0; i < page_cnt; i++) {
4cb5300b 1263 struct page *page;
600a45e1 1264again:
a94733d0 1265 page = find_or_create_page(inode->i_mapping,
600a45e1 1266 start_index + i, mask);
4cb5300b
CM		 1267 if (!page)
1268 break;
1269
600a45e1 1270 page_start = page_offset(page);
09cbfeaf 1271 page_end = page_start + PAGE_SIZE - 1;
600a45e1 1272 while (1) {
308d9800 1273 lock_extent_bits(tree, page_start, page_end,
ff13db41 1274 &cached_state);
600a45e1
MX		 1275 ordered = btrfs_lookup_ordered_extent(inode,
1276 page_start);
308d9800 1277 unlock_extent_cached(tree, page_start, page_end,
e43bbe5e 1278 &cached_state);
600a45e1
MX		 1279 if (!ordered)
1280 break;
1281
1282 unlock_page(page);
1283 btrfs_start_ordered_extent(inode, ordered, 1);
1284 btrfs_put_ordered_extent(ordered);
1285 lock_page(page);
1f12bd06
LB		 1286 /*
1287 * we unlocked the page above, so we need check if
1288 * it was released or not.
1289 */
1290 if (page->mapping != inode->i_mapping) {
1291 unlock_page(page);
09cbfeaf 1292 put_page(page);
1f12bd06
LB		 1293 goto again;
1294 }
600a45e1
MX		 1295 }
1296
4cb5300b
CM		 1297 if (!PageUptodate(page)) {
1298 btrfs_readpage(NULL, page);
1299 lock_page(page);
1300 if (!PageUptodate(page)) {
1301 unlock_page(page);
09cbfeaf 1302 put_page(page);
4cb5300b
CM		 1303 ret = -EIO;
1304 break;
1305 }
1306 }
600a45e1 1307
600a45e1
MX		 1308 if (page->mapping != inode->i_mapping) {
1309 unlock_page(page);
09cbfeaf 1310 put_page(page);
600a45e1
MX		 1311 goto again;
1312 }
1313
4cb5300b
CM		 1314 pages[i] = page;
1315 i_done++;
1316 }
1317 if (!i_done || ret)
1318 goto out;
1319
1751e8a6 1320 if (!(inode->i_sb->s_flags & SB_ACTIVE))
4cb5300b
CM		 1321 goto out;
1322
1323 /*
1324 * so now we have a nice long stream of locked
1325 * and up to date pages, lets wait on them
1326 */
1327 for (i = 0; i < i_done; i++)
1328 wait_on_page_writeback(pages[i]);
1329
1330 page_start = page_offset(pages[0]);
09cbfeaf 1331 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
4cb5300b
CM		 1332
1333 lock_extent_bits(&BTRFS_I(inode)->io_tree,
ff13db41 1334 page_start, page_end - 1, &cached_state);
4cb5300b 1335 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
e182163d
OS		 1336 page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
1337 EXTENT_DEFRAG, 0, 0, &cached_state);
4cb5300b 1338
1f12bd06 1339 if (i_done != page_cnt) {
9e0baf60 1340 spin_lock(&BTRFS_I(inode)->lock);
28c4a3e2 1341 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
9e0baf60 1342 spin_unlock(&BTRFS_I(inode)->lock);
bc42bda2 1343 btrfs_delalloc_release_space(inode, data_reserved,
09cbfeaf 1344 start_index << PAGE_SHIFT,
43b18595 1345 (page_cnt - i_done) << PAGE_SHIFT, true);
4cb5300b
CM		 1346 }
1347
1348
9e8a4a8b 1349 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
018ed4f7 1350 &cached_state);
4cb5300b
CM		 1351
1352 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
e43bbe5e 1353 page_start, page_end - 1, &cached_state);
4cb5300b
CM		 1354
1355 for (i = 0; i < i_done; i++) {
1356 clear_page_dirty_for_io(pages[i]);
1357 ClearPageChecked(pages[i]);
1358 set_page_extent_mapped(pages[i]);
1359 set_page_dirty(pages[i]);
1360 unlock_page(pages[i]);
09cbfeaf 1361 put_page(pages[i]);
4cb5300b 1362 }
8702ba93 1363 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
364ecf36 1364 extent_changeset_free(data_reserved);
4cb5300b
CM		 1365 return i_done;
1366out:
1367 for (i = 0; i < i_done; i++) {
1368 unlock_page(pages[i]);
09cbfeaf 1369 put_page(pages[i]);
4cb5300b 1370 }
bc42bda2 1371 btrfs_delalloc_release_space(inode, data_reserved,
09cbfeaf 1372 start_index << PAGE_SHIFT,
43b18595 1373 page_cnt << PAGE_SHIFT, true);
8702ba93 1374 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
364ecf36 1375 extent_changeset_free(data_reserved);
4cb5300b
CM		 1376 return ret;
1377
1378}
1379
1380int btrfs_defrag_file(struct inode *inode, struct file *file,
1381 struct btrfs_ioctl_defrag_range_args *range,
1382 u64 newer_than, unsigned long max_to_defrag)
1383{
0b246afa 1384 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4cb5300b 1385 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1386 struct file_ra_state *ra = NULL;
f46b5a66 1387 unsigned long last_index;
151a31b2 1388 u64 isize = i_size_read(inode);
940100a4
CM		 1389 u64 last_len = 0;
1390 u64 skip = 0;
1391 u64 defrag_end = 0;
4cb5300b 1392 u64 newer_off = range->start;
f46b5a66 1393 unsigned long i;
008873ea 1394 unsigned long ra_index = 0;
f46b5a66 1395 int ret;
4cb5300b 1396 int defrag_count = 0;
1a419d85 1397 int compress_type = BTRFS_COMPRESS_ZLIB;
aab110ab 1398 u32 extent_thresh = range->extent_thresh;
09cbfeaf 1399 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
c41570c9 1400 unsigned long cluster = max_cluster;
ee22184b 1401 u64 new_align = ~((u64)SZ_128K - 1);
4cb5300b 1402 struct page **pages = NULL;
1e2ef46d 1403 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
4cb5300b 1404
0abd5b17
LB		 1405 if (isize == 0)
1406 return 0;
1407
1408 if (range->start >= isize)
1409 return -EINVAL;
1a419d85 1410
1e2ef46d 1411 if (do_compress) {
ce96b7ff 1412 if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES)
1a419d85
LZ		 1413 return -EINVAL;
1414 if (range->compress_type)
1415 compress_type = range->compress_type;
1416 }
f46b5a66 1417
0abd5b17 1418 if (extent_thresh == 0)
ee22184b 1419 extent_thresh = SZ_256K;
940100a4 1420
4cb5300b 1421 /*
0a52d108
DS		 1422 * If we were not given a file, allocate a readahead context. As
1423 * readahead is just an optimization, defrag will work without it so
1424 * we don't error out.
4cb5300b
CM		 1425 */
1426 if (!file) {
63e727ec 1427 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
0a52d108
DS		 1428 if (ra)
1429 file_ra_state_init(ra, inode->i_mapping);
4cb5300b
CM		 1430 } else {
1431 ra = &file->f_ra;
1432 }
1433
63e727ec 1434 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
4cb5300b
CM		 1435 if (!pages) {
1436 ret = -ENOMEM;
1437 goto out_ra;
1438 }
1439
1440 /* find the last page to defrag */
1e701a32 1441 if (range->start + range->len > range->start) {
151a31b2 1442 last_index = min_t(u64, isize - 1,
09cbfeaf 1443 range->start + range->len - 1) >> PAGE_SHIFT;
1e701a32 1444 } else {
09cbfeaf 1445 last_index = (isize - 1) >> PAGE_SHIFT;
1e701a32
CM		 1446 }
1447
4cb5300b
CM		 1448 if (newer_than) {
1449 ret = find_new_extents(root, inode, newer_than,
ee22184b 1450 &newer_off, SZ_64K);
4cb5300b
CM		 1451 if (!ret) {
1452 range->start = newer_off;
1453 /*
1454 * we always align our defrag to help keep
1455 * the extents in the file evenly spaced
1456 */
09cbfeaf 1457 i = (newer_off & new_align) >> PAGE_SHIFT;
4cb5300b
CM		 1458 } else
1459 goto out_ra;
1460 } else {
09cbfeaf 1461 i = range->start >> PAGE_SHIFT;
4cb5300b
CM		 1462 }
1463 if (!max_to_defrag)
070034bd 1464 max_to_defrag = last_index - i + 1;
4cb5300b 1465
2a0f7f57
LZ		 1466 /*
1467 * make writeback starts from i, so the defrag range can be
1468 * written sequentially.
1469 */
1470 if (i < inode->i_mapping->writeback_index)
1471 inode->i_mapping->writeback_index = i;
1472
f7f43cc8 1473 while (i <= last_index && defrag_count < max_to_defrag &&
09cbfeaf 1474 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
4cb5300b
CM		 1475 /*
1476 * make sure we stop running if someone unmounts
1477 * the FS
1478 */
1751e8a6 1479 if (!(inode->i_sb->s_flags & SB_ACTIVE))
4cb5300b
CM		 1480 break;
1481
0b246afa
JM		 1482 if (btrfs_defrag_cancelled(fs_info)) {
1483 btrfs_debug(fs_info, "defrag_file cancelled");
210549eb
DS		 1484 ret = -EAGAIN;
1485 break;
1486 }
1487
09cbfeaf 1488 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
6c282eb4 1489 extent_thresh, &last_len, &skip,
1e2ef46d 1490 &defrag_end, do_compress)){
940100a4
CM		 1491 unsigned long next;
1492 /*
1493 * the should_defrag function tells us how much to skip
1494 * bump our counter by the suggested amount
1495 */
09cbfeaf 1496 next = DIV_ROUND_UP(skip, PAGE_SIZE);
940100a4
CM		 1497 i = max(i + 1, next);
1498 continue;
1499 }
008873ea
LZ		 1500
1501 if (!newer_than) {
09cbfeaf
KS		 1502 cluster = (PAGE_ALIGN(defrag_end) >>
1503 PAGE_SHIFT) - i;
008873ea
LZ		 1504 cluster = min(cluster, max_cluster);
1505 } else {
1506 cluster = max_cluster;
1507 }
1508
008873ea
LZ		 1509 if (i + cluster > ra_index) {
1510 ra_index = max(i, ra_index);
0a52d108 1511 if (ra)
d3c0bab5
DS		 1512 page_cache_sync_readahead(inode->i_mapping, ra,
1513 file, ra_index, cluster);
e4826a5b 1514 ra_index += cluster;
008873ea 1515 }
940100a4 1516
5955102c 1517 inode_lock(inode);
eede2bf3
OS		 1518 if (IS_SWAPFILE(inode)) {
1519 ret = -ETXTBSY;
1520 } else {
1521 if (do_compress)
1522 BTRFS_I(inode)->defrag_compress = compress_type;
1523 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1524 }
ecb8bea8 1525 if (ret < 0) {
5955102c 1526 inode_unlock(inode);
4cb5300b 1527 goto out_ra;
ecb8bea8 1528 }
4cb5300b
CM		 1529
1530 defrag_count += ret;
d0e1d66b 1531 balance_dirty_pages_ratelimited(inode->i_mapping);
5955102c 1532 inode_unlock(inode);
4cb5300b
CM		 1533
1534 if (newer_than) {
1535 if (newer_off == (u64)-1)
1536 break;
1537
e1f041e1
LB		 1538 if (ret > 0)
1539 i += ret;
1540
4cb5300b 1541 newer_off = max(newer_off + 1,
09cbfeaf 1542 (u64)i << PAGE_SHIFT);
4cb5300b 1543
ee22184b
BL		 1544 ret = find_new_extents(root, inode, newer_than,
1545 &newer_off, SZ_64K);
4cb5300b
CM		 1546 if (!ret) {
1547 range->start = newer_off;
09cbfeaf 1548 i = (newer_off & new_align) >> PAGE_SHIFT;
4cb5300b
CM		 1549 } else {
1550 break;
f46b5a66 1551 }
4cb5300b 1552 } else {
008873ea 1553 if (ret > 0) {
cbcc8326 1554 i += ret;
09cbfeaf 1555 last_len += ret << PAGE_SHIFT;
008873ea 1556 } else {
cbcc8326 1557 i++;
008873ea
LZ		 1558 last_len = 0;
1559 }
f46b5a66 1560 }
f46b5a66
CH		 1561 }
1562
dec8ef90 1563 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1e701a32 1564 filemap_flush(inode->i_mapping);
dec8ef90
FM		 1565 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1566 &BTRFS_I(inode)->runtime_flags))
1567 filemap_flush(inode->i_mapping);
1568 }
1e701a32 1569
1a419d85 1570 if (range->compress_type == BTRFS_COMPRESS_LZO) {
0b246afa 1571 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
5c1aab1d
NT		 1572 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1573 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1a419d85
LZ		 1574 }
1575
60ccf82f 1576 ret = defrag_count;
940100a4 1577
4cb5300b 1578out_ra:
1e2ef46d 1579 if (do_compress) {
5955102c 1580 inode_lock(inode);
eec63c65 1581 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
5955102c 1582 inode_unlock(inode);
633085c7 1583 }
4cb5300b
CM		 1584 if (!file)
1585 kfree(ra);
1586 kfree(pages);
940100a4 1587 return ret;
f46b5a66
CH		 1588}
1589
198605a8 1590static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1591 void __user *arg)
f46b5a66 1592{
0b246afa
JM		 1593 struct inode *inode = file_inode(file);
1594 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f46b5a66
CH		 1595 u64 new_size;
1596 u64 old_size;
1597 u64 devid = 1;
0b246afa 1598 struct btrfs_root *root = BTRFS_I(inode)->root;
f46b5a66
CH		 1599 struct btrfs_ioctl_vol_args *vol_args;
1600 struct btrfs_trans_handle *trans;
1601 struct btrfs_device *device = NULL;
1602 char *sizestr;
9a40f122 1603 char *retptr;
f46b5a66
CH		 1604 char *devstr = NULL;
1605 int ret = 0;
f46b5a66
CH		 1606 int mod = 0;
1607
e441d54d
CM		 1608 if (!capable(CAP_SYS_ADMIN))
1609 return -EPERM;
1610
198605a8
MX		 1611 ret = mnt_want_write_file(file);
1612 if (ret)
1613 return ret;
1614
171938e5 1615 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
97547676 1616 mnt_drop_write_file(file);
e57138b3 1617 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1618 }
1619
dae7b665 1620 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1621 if (IS_ERR(vol_args)) {
1622 ret = PTR_ERR(vol_args);
1623 goto out;
1624 }
5516e595
MF		 1625
1626 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1627
f46b5a66
CH		 1628 sizestr = vol_args->name;
1629 devstr = strchr(sizestr, ':');
1630 if (devstr) {
f46b5a66
CH		 1631 sizestr = devstr + 1;
1632 *devstr = '\0';
1633 devstr = vol_args->name;
58dfae63
Z		 1634 ret = kstrtoull(devstr, 10, &devid);
1635 if (ret)
1636 goto out_free;
dfd79829
MX		 1637 if (!devid) {
1638 ret = -EINVAL;
1639 goto out_free;
1640 }
0b246afa 1641 btrfs_info(fs_info, "resizing devid %llu", devid);
f46b5a66 1642 }
dba60f3f 1643
09ba3bc9 1644 device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
f46b5a66 1645 if (!device) {
0b246afa
JM		 1646 btrfs_info(fs_info, "resizer unable to find device %llu",
1647 devid);
dfd79829 1648 ret = -ENODEV;
c9e9f97b 1649 goto out_free;
f46b5a66 1650 }
dba60f3f 1651
ebbede42 1652 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
0b246afa 1653 btrfs_info(fs_info,
efe120a0 1654 "resizer unable to apply on readonly device %llu",
c1c9ff7c 1655 devid);
dfd79829 1656 ret = -EPERM;
4e42ae1b
LB		 1657 goto out_free;
1658 }
1659
f46b5a66
CH		 1660 if (!strcmp(sizestr, "max"))
1661 new_size = device->bdev->bd_inode->i_size;
1662 else {
1663 if (sizestr[0] == '-') {
1664 mod = -1;
1665 sizestr++;
1666 } else if (sizestr[0] == '+') {
1667 mod = 1;
1668 sizestr++;
1669 }
9a40f122
GH		 1670 new_size = memparse(sizestr, &retptr);
1671 if (*retptr != '\0' || new_size == 0) {
f46b5a66 1672 ret = -EINVAL;
c9e9f97b 1673 goto out_free;
f46b5a66
CH		 1674 }
1675 }
1676
401e29c1 1677 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
dfd79829 1678 ret = -EPERM;
63a212ab
SB		 1679 goto out_free;
1680 }
1681
7cc8e58d 1682 old_size = btrfs_device_get_total_bytes(device);
f46b5a66
CH		 1683
1684 if (mod < 0) {
1685 if (new_size > old_size) {
1686 ret = -EINVAL;
c9e9f97b 1687 goto out_free;
f46b5a66
CH		 1688 }
1689 new_size = old_size - new_size;
1690 } else if (mod > 0) {
eb8052e0 1691 if (new_size > ULLONG_MAX - old_size) {
902c68a4 1692 ret = -ERANGE;
eb8052e0
WF		 1693 goto out_free;
1694 }
f46b5a66
CH		 1695 new_size = old_size + new_size;
1696 }
1697
ee22184b 1698 if (new_size < SZ_256M) {
f46b5a66 1699 ret = -EINVAL;
c9e9f97b 1700 goto out_free;
f46b5a66
CH		 1701 }
1702 if (new_size > device->bdev->bd_inode->i_size) {
1703 ret = -EFBIG;
c9e9f97b 1704 goto out_free;
f46b5a66
CH		 1705 }
1706
47f08b96 1707 new_size = round_down(new_size, fs_info->sectorsize);
f46b5a66 1708
0b246afa
JM		 1709 btrfs_info_in_rcu(fs_info, "new size for %s is %llu",
1710 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1711
1712 if (new_size > old_size) {
a22285a6 1713 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1714 if (IS_ERR(trans)) {
1715 ret = PTR_ERR(trans);
c9e9f97b 1716 goto out_free;
98d5dc13 1717 }
f46b5a66 1718 ret = btrfs_grow_device(trans, device, new_size);
3a45bb20 1719 btrfs_commit_transaction(trans);
ece7d20e 1720 } else if (new_size < old_size) {
f46b5a66 1721 ret = btrfs_shrink_device(device, new_size);
0253f40e 1722 } /* equal, nothing need to do */
f46b5a66 1723
c9e9f97b 1724out_free:
f46b5a66 1725 kfree(vol_args);
c9e9f97b 1726out:
171938e5 1727 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
18f39c41 1728 mnt_drop_write_file(file);
f46b5a66
CH		 1729 return ret;
1730}
1731
72fd032e 1732static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
52f75f4f 1733 const char *name, unsigned long fd, int subvol,
6f72c7e2 1734 u64 *transid, bool readonly,
8696c533 1735 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1736{
f46b5a66 1737 int namelen;
3de4586c 1738 int ret = 0;
f46b5a66 1739
325c50e3
JM		 1740 if (!S_ISDIR(file_inode(file)->i_mode))
1741 return -ENOTDIR;
1742
a874a63e
LB		 1743 ret = mnt_want_write_file(file);
1744 if (ret)
1745 goto out;
1746
72fd032e
SW		 1747 namelen = strlen(name);
1748 if (strchr(name, '/')) {
f46b5a66 1749 ret = -EINVAL;
a874a63e 1750 goto out_drop_write;
f46b5a66
CH		 1751 }
1752
16780cab
CM		 1753 if (name[0] == '.' &&
1754 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1755 ret = -EEXIST;
a874a63e 1756 goto out_drop_write;
16780cab
CM		 1757 }
1758
3de4586c 1759 if (subvol) {
72fd032e 1760 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1761 NULL, transid, readonly, inherit);
cb8e7090 1762 } else {
2903ff01 1763 struct fd src = fdget(fd);
3de4586c 1764 struct inode *src_inode;
2903ff01 1765 if (!src.file) {
3de4586c 1766 ret = -EINVAL;
a874a63e 1767 goto out_drop_write;
3de4586c
CM		 1768 }
1769
496ad9aa
AV		 1770 src_inode = file_inode(src.file);
1771 if (src_inode->i_sb != file_inode(file)->i_sb) {
c79b4713 1772 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
efe120a0 1773 "Snapshot src from another FS");
23ad5b17 1774 ret = -EXDEV;
d0242061
DS		 1775 } else if (!inode_owner_or_capable(src_inode)) {
1776 /*
1777 * Subvolume creation is not restricted, but snapshots
1778 * are limited to own subvolumes only
1779 */
1780 ret = -EPERM;
ecd18815
AV		 1781 } else {
1782 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1783 BTRFS_I(src_inode)->root,
1784 transid, readonly, inherit);
3de4586c 1785 }
2903ff01 1786 fdput(src);
cb8e7090 1787 }
a874a63e
LB		 1788out_drop_write:
1789 mnt_drop_write_file(file);
f46b5a66 1790out:
72fd032e
SW		 1791 return ret;
1792}
1793
1794static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1795 void __user *arg, int subvol)
72fd032e 1796{
fa0d2b9b 1797 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1798 int ret;
1799
325c50e3
JM		 1800 if (!S_ISDIR(file_inode(file)->i_mode))
1801 return -ENOTDIR;
1802
fa0d2b9b
LZ		 1803 vol_args = memdup_user(arg, sizeof(*vol_args));
1804 if (IS_ERR(vol_args))
1805 return PTR_ERR(vol_args);
1806 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1807
fa0d2b9b 1808 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1809 vol_args->fd, subvol,
6f72c7e2 1810 NULL, false, NULL);
fdfb1e4f 1811
fa0d2b9b
LZ		 1812 kfree(vol_args);
1813 return ret;
1814}
fdfb1e4f 1815
fa0d2b9b
LZ		 1816static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1817 void __user *arg, int subvol)
1818{
1819 struct btrfs_ioctl_vol_args_v2 *vol_args;
1820 int ret;
1821 u64 transid = 0;
1822 u64 *ptr = NULL;
b83cc969 1823 bool readonly = false;
6f72c7e2 1824 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1825
325c50e3
JM		 1826 if (!S_ISDIR(file_inode(file)->i_mode))
1827 return -ENOTDIR;
1828
fa0d2b9b
LZ		 1829 vol_args = memdup_user(arg, sizeof(*vol_args));
1830 if (IS_ERR(vol_args))
1831 return PTR_ERR(vol_args);
1832 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1833
b83cc969 1834 if (vol_args->flags &
6f72c7e2
AJ		 1835 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1836 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1837 ret = -EOPNOTSUPP;
c47ca32d 1838 goto free_args;
72fd032e 1839 }
fa0d2b9b 1840
ebc87351
NB		 1841 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1842 struct inode *inode = file_inode(file);
1843 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1844
1845 btrfs_warn(fs_info,
1846"SNAP_CREATE_V2 ioctl with CREATE_ASYNC is deprecated and will be removed in kernel 5.7");
1847
fa0d2b9b 1848 ptr = &transid;
ebc87351 1849 }
b83cc969
LZ		 1850 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1851 readonly = true;
6f72c7e2 1852 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
09cbfeaf 1853 if (vol_args->size > PAGE_SIZE) {
6f72c7e2 1854 ret = -EINVAL;
c47ca32d 1855 goto free_args;
6f72c7e2
AJ		 1856 }
1857 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1858 if (IS_ERR(inherit)) {
1859 ret = PTR_ERR(inherit);
c47ca32d 1860 goto free_args;
6f72c7e2
AJ		 1861 }
1862 }
fa0d2b9b
LZ		 1863
1864 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1865 vol_args->fd, subvol, ptr,
8696c533 1866 readonly, inherit);
c47ca32d
DC		 1867 if (ret)
1868 goto free_inherit;
fa0d2b9b 1869
c47ca32d
DC		 1870 if (ptr && copy_to_user(arg +
1871 offsetof(struct btrfs_ioctl_vol_args_v2,
1872 transid),
1873 ptr, sizeof(*ptr)))
fa0d2b9b 1874 ret = -EFAULT;
c47ca32d
DC		 1875
1876free_inherit:
6f72c7e2 1877 kfree(inherit);
c47ca32d
DC		 1878free_args:
1879 kfree(vol_args);
f46b5a66
CH		 1880 return ret;
1881}
1882
0caa102d
LZ		 1883static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1884 void __user *arg)
1885{
496ad9aa 1886 struct inode *inode = file_inode(file);
0b246afa 1887 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
0caa102d
LZ		 1888 struct btrfs_root *root = BTRFS_I(inode)->root;
1889 int ret = 0;
1890 u64 flags = 0;
1891
4a0cc7ca 1892 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1893 return -EINVAL;
1894
0b246afa 1895 down_read(&fs_info->subvol_sem);
0caa102d
LZ		 1896 if (btrfs_root_readonly(root))
1897 flags |= BTRFS_SUBVOL_RDONLY;
0b246afa 1898 up_read(&fs_info->subvol_sem);
0caa102d
LZ		 1899
1900 if (copy_to_user(arg, &flags, sizeof(flags)))
1901 ret = -EFAULT;
1902
1903 return ret;
1904}
1905
1906static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1907 void __user *arg)
1908{
496ad9aa 1909 struct inode *inode = file_inode(file);
0b246afa 1910 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
0caa102d
LZ		 1911 struct btrfs_root *root = BTRFS_I(inode)->root;
1912 struct btrfs_trans_handle *trans;
1913 u64 root_flags;
1914 u64 flags;
1915 int ret = 0;
1916
bd60ea0f
DS		 1917 if (!inode_owner_or_capable(inode))
1918 return -EPERM;
1919
b9ca0664
LB		 1920 ret = mnt_want_write_file(file);
1921 if (ret)
1922 goto out;
0caa102d 1923
4a0cc7ca 1924 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
b9ca0664
LB		 1925 ret = -EINVAL;
1926 goto out_drop_write;
1927 }
0caa102d 1928
b9ca0664
LB		 1929 if (copy_from_user(&flags, arg, sizeof(flags))) {
1930 ret = -EFAULT;
1931 goto out_drop_write;
1932 }
0caa102d 1933
b9ca0664
LB		 1934 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1935 ret = -EINVAL;
1936 goto out_drop_write;
1937 }
0caa102d 1938
b9ca0664
LB		 1939 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1940 ret = -EOPNOTSUPP;
1941 goto out_drop_write;
1942 }
0caa102d 1943
0b246afa 1944 down_write(&fs_info->subvol_sem);
0caa102d
LZ		 1945
1946 /* nothing to do */
1947 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1948 goto out_drop_sem;
0caa102d
LZ		 1949
1950 root_flags = btrfs_root_flags(&root->root_item);
2c686537 1951 if (flags & BTRFS_SUBVOL_RDONLY) {
0caa102d
LZ		 1952 btrfs_set_root_flags(&root->root_item,
1953 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1954 } else {
1955 /*
1956 * Block RO -> RW transition if this subvolume is involved in
1957 * send
1958 */
1959 spin_lock(&root->root_item_lock);
1960 if (root->send_in_progress == 0) {
1961 btrfs_set_root_flags(&root->root_item,
0caa102d 1962 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1963 spin_unlock(&root->root_item_lock);
1964 } else {
1965 spin_unlock(&root->root_item_lock);
0b246afa
JM		 1966 btrfs_warn(fs_info,
1967 "Attempt to set subvolume %llu read-write during send",
1968 root->root_key.objectid);
2c686537
DS		 1969 ret = -EPERM;
1970 goto out_drop_sem;
1971 }
1972 }
0caa102d
LZ		 1973
1974 trans = btrfs_start_transaction(root, 1);
1975 if (IS_ERR(trans)) {
1976 ret = PTR_ERR(trans);
1977 goto out_reset;
1978 }
1979
0b246afa 1980 ret = btrfs_update_root(trans, fs_info->tree_root,
0caa102d 1981 &root->root_key, &root->root_item);
9417ebc8
NB		 1982 if (ret < 0) {
1983 btrfs_end_transaction(trans);
1984 goto out_reset;
1985 }
1986
1987 ret = btrfs_commit_transaction(trans);
0caa102d 1988
0caa102d
LZ		 1989out_reset:
1990 if (ret)
1991 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1992out_drop_sem:
0b246afa 1993 up_write(&fs_info->subvol_sem);
b9ca0664
LB		 1994out_drop_write:
1995 mnt_drop_write_file(file);
1996out:
0caa102d
LZ		 1997 return ret;
1998}
1999
ac8e9819
CM		 2000static noinline int key_in_sk(struct btrfs_key *key,
2001 struct btrfs_ioctl_search_key *sk)
2002{
abc6e134
CM		 2003 struct btrfs_key test;
2004 int ret;
2005
2006 test.objectid = sk->min_objectid;
2007 test.type = sk->min_type;
2008 test.offset = sk->min_offset;
2009
2010 ret = btrfs_comp_cpu_keys(key, &test);
2011 if (ret < 0)
ac8e9819 2012 return 0;
abc6e134
CM		 2013
2014 test.objectid = sk->max_objectid;
2015 test.type = sk->max_type;
2016 test.offset = sk->max_offset;
2017
2018 ret = btrfs_comp_cpu_keys(key, &test);
2019 if (ret > 0)
ac8e9819
CM		 2020 return 0;
2021 return 1;
2022}
2023
df397565 2024static noinline int copy_to_sk(struct btrfs_path *path,
ac8e9819
CM		 2025 struct btrfs_key *key,
2026 struct btrfs_ioctl_search_key *sk,
9b6e817d 2027 size_t *buf_size,
ba346b35 2028 char __user *ubuf,
ac8e9819
CM		 2029 unsigned long *sk_offset,
2030 int *num_found)
2031{
2032 u64 found_transid;
2033 struct extent_buffer *leaf;
2034 struct btrfs_ioctl_search_header sh;
dd81d459 2035 struct btrfs_key test;
ac8e9819
CM		 2036 unsigned long item_off;
2037 unsigned long item_len;
2038 int nritems;
2039 int i;
2040 int slot;
ac8e9819
CM		 2041 int ret = 0;
2042
2043 leaf = path->nodes[0];
2044 slot = path->slots[0];
2045 nritems = btrfs_header_nritems(leaf);
2046
2047 if (btrfs_header_generation(leaf) > sk->max_transid) {
2048 i = nritems;
2049 goto advance_key;
2050 }
2051 found_transid = btrfs_header_generation(leaf);
2052
2053 for (i = slot; i < nritems; i++) {
2054 item_off = btrfs_item_ptr_offset(leaf, i);
2055 item_len = btrfs_item_size_nr(leaf, i);
2056
03b71c6c
GP		 2057 btrfs_item_key_to_cpu(leaf, key, i);
2058 if (!key_in_sk(key, sk))
2059 continue;
2060
9b6e817d 2061 if (sizeof(sh) + item_len > *buf_size) {
8f5f6178
GH		 2062 if (*num_found) {
2063 ret = 1;
2064 goto out;
2065 }
2066
2067 /*
2068 * return one empty item back for v1, which does not
2069 * handle -EOVERFLOW
2070 */
2071
9b6e817d 2072 *buf_size = sizeof(sh) + item_len;
ac8e9819 2073 item_len = 0;
8f5f6178
GH		 2074 ret = -EOVERFLOW;
2075 }
ac8e9819 2076
9b6e817d 2077 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
ac8e9819 2078 ret = 1;
25c9bc2e 2079 goto out;
ac8e9819
CM		 2080 }
2081
ac8e9819
CM		 2082 sh.objectid = key->objectid;
2083 sh.offset = key->offset;
2084 sh.type = key->type;
2085 sh.len = item_len;
2086 sh.transid = found_transid;
2087
2088 /* copy search result header */
ba346b35
GH		 2089 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2090 ret = -EFAULT;
2091 goto out;
2092 }
2093
ac8e9819
CM		 2094 *sk_offset += sizeof(sh);
2095
2096 if (item_len) {
ba346b35 2097 char __user *up = ubuf + *sk_offset;
ac8e9819 2098 /* copy the item */
ba346b35
GH		 2099 if (read_extent_buffer_to_user(leaf, up,
2100 item_off, item_len)) {
2101 ret = -EFAULT;
2102 goto out;
2103 }
2104
ac8e9819 2105 *sk_offset += item_len;
ac8e9819 2106 }
e2156867 2107 (*num_found)++;
ac8e9819 2108
8f5f6178
GH		 2109 if (ret) /* -EOVERFLOW from above */
2110 goto out;
2111
25c9bc2e
GH		 2112 if (*num_found >= sk->nr_items) {
2113 ret = 1;
2114 goto out;
2115 }
ac8e9819
CM		 2116 }
2117advance_key:
abc6e134 2118 ret = 0;
dd81d459
NA		 2119 test.objectid = sk->max_objectid;
2120 test.type = sk->max_type;
2121 test.offset = sk->max_offset;
2122 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2123 ret = 1;
2124 else if (key->offset < (u64)-1)
ac8e9819 2125 key->offset++;
dd81d459 2126 else if (key->type < (u8)-1) {
abc6e134 2127 key->offset = 0;
ac8e9819 2128 key->type++;
dd81d459 2129 } else if (key->objectid < (u64)-1) {
abc6e134
CM		 2130 key->offset = 0;
2131 key->type = 0;
ac8e9819 2132 key->objectid++;
abc6e134
CM		 2133 } else
2134 ret = 1;
25c9bc2e 2135out:
ba346b35
GH		 2136 /*
2137 * 0: all items from this leaf copied, continue with next
2138 * 1: * more items can be copied, but unused buffer is too small
2139 * * all items were found
2140 * Either way, it will stops the loop which iterates to the next
2141 * leaf
2142 * -EOVERFLOW: item was to large for buffer
2143 * -EFAULT: could not copy extent buffer back to userspace
2144 */
ac8e9819
CM		 2145 return ret;
2146}
2147
2148static noinline int search_ioctl(struct inode *inode,
12544442 2149 struct btrfs_ioctl_search_key *sk,
9b6e817d 2150 size_t *buf_size,
ba346b35 2151 char __user *ubuf)
ac8e9819 2152{
0b246afa 2153 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
ac8e9819
CM		 2154 struct btrfs_root *root;
2155 struct btrfs_key key;
ac8e9819 2156 struct btrfs_path *path;
ac8e9819
CM		 2157 int ret;
2158 int num_found = 0;
2159 unsigned long sk_offset = 0;
2160
9b6e817d
GH		 2161 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2162 *buf_size = sizeof(struct btrfs_ioctl_search_header);
12544442 2163 return -EOVERFLOW;
9b6e817d 2164 }
12544442 2165
ac8e9819
CM		 2166 path = btrfs_alloc_path();
2167 if (!path)
2168 return -ENOMEM;
2169
2170 if (sk->tree_id == 0) {
2171 /* search the root of the inode that was passed */
2172 root = BTRFS_I(inode)->root;
2173 } else {
2174 key.objectid = sk->tree_id;
2175 key.type = BTRFS_ROOT_ITEM_KEY;
2176 key.offset = (u64)-1;
2177 root = btrfs_read_fs_root_no_name(info, &key);
2178 if (IS_ERR(root)) {
ac8e9819 2179 btrfs_free_path(path);
ad1e3d56 2180 return PTR_ERR(root);
ac8e9819
CM		 2181 }
2182 }
2183
2184 key.objectid = sk->min_objectid;
2185 key.type = sk->min_type;
2186 key.offset = sk->min_offset;
2187
67871254 2188 while (1) {
6174d3cb 2189 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
ac8e9819
CM		 2190 if (ret != 0) {
2191 if (ret > 0)
2192 ret = 0;
2193 goto err;
2194 }
df397565 2195 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
ac8e9819 2196 &sk_offset, &num_found);
b3b4aa74 2197 btrfs_release_path(path);
25c9bc2e 2198 if (ret)
ac8e9819
CM		 2199 break;
2200
2201 }
8f5f6178
GH		 2202 if (ret > 0)
2203 ret = 0;
ac8e9819
CM		 2204err:
2205 sk->nr_items = num_found;
2206 btrfs_free_path(path);
2207 return ret;
2208}
2209
2210static noinline int btrfs_ioctl_tree_search(struct file *file,
2211 void __user *argp)
2212{
ba346b35
GH		 2213 struct btrfs_ioctl_search_args __user *uargs;
2214 struct btrfs_ioctl_search_key sk;
9b6e817d
GH		 2215 struct inode *inode;
2216 int ret;
2217 size_t buf_size;
ac8e9819
CM		 2218
2219 if (!capable(CAP_SYS_ADMIN))
2220 return -EPERM;
2221
ba346b35
GH		 2222 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2223
2224 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2225 return -EFAULT;
ac8e9819 2226
ba346b35 2227 buf_size = sizeof(uargs->buf);
ac8e9819 2228
496ad9aa 2229 inode = file_inode(file);
ba346b35 2230 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
8f5f6178
GH		 2231
2232 /*
2233 * In the origin implementation an overflow is handled by returning a
2234 * search header with a len of zero, so reset ret.
2235 */
2236 if (ret == -EOVERFLOW)
2237 ret = 0;
2238
ba346b35 2239 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
ac8e9819 2240 ret = -EFAULT;
ac8e9819
CM		 2241 return ret;
2242}
2243
cc68a8a5
GH		 2244static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2245 void __user *argp)
2246{
2247 struct btrfs_ioctl_search_args_v2 __user *uarg;
2248 struct btrfs_ioctl_search_args_v2 args;
2249 struct inode *inode;
2250 int ret;
2251 size_t buf_size;
ee22184b 2252 const size_t buf_limit = SZ_16M;
cc68a8a5
GH		 2253
2254 if (!capable(CAP_SYS_ADMIN))
2255 return -EPERM;
2256
2257 /* copy search header and buffer size */
2258 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2259 if (copy_from_user(&args, uarg, sizeof(args)))
2260 return -EFAULT;
2261
2262 buf_size = args.buf_size;
2263
cc68a8a5
GH		 2264 /* limit result size to 16MB */
2265 if (buf_size > buf_limit)
2266 buf_size = buf_limit;
2267
2268 inode = file_inode(file);
2269 ret = search_ioctl(inode, &args.key, &buf_size,
718dc5fa 2270 (char __user *)(&uarg->buf[0]));
cc68a8a5
GH		 2271 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2272 ret = -EFAULT;
2273 else if (ret == -EOVERFLOW &&
2274 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2275 ret = -EFAULT;
2276
ac8e9819
CM		 2277 return ret;
2278}
2279
98d377a0 2280/*
ac8e9819
CM		 2281 * Search INODE_REFs to identify path name of 'dirid' directory
2282 * in a 'tree_id' tree. and sets path name to 'name'.
2283 */
98d377a0
TH		 2284static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2285 u64 tree_id, u64 dirid, char *name)
2286{
2287 struct btrfs_root *root;
2288 struct btrfs_key key;
ac8e9819 2289 char *ptr;
98d377a0
TH		 2290 int ret = -1;
2291 int slot;
2292 int len;
2293 int total_len = 0;
2294 struct btrfs_inode_ref *iref;
2295 struct extent_buffer *l;
2296 struct btrfs_path *path;
2297
2298 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2299 name[0]='\0';
2300 return 0;
2301 }
2302
2303 path = btrfs_alloc_path();
2304 if (!path)
2305 return -ENOMEM;
2306
c8bcbfbd 2307 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
98d377a0
TH		 2308
2309 key.objectid = tree_id;
2310 key.type = BTRFS_ROOT_ITEM_KEY;
2311 key.offset = (u64)-1;
2312 root = btrfs_read_fs_root_no_name(info, &key);
2313 if (IS_ERR(root)) {
ad1e3d56 2314 ret = PTR_ERR(root);
8ad6fcab 2315 goto out;
98d377a0
TH		 2316 }
2317
2318 key.objectid = dirid;
2319 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2320 key.offset = (u64)-1;
98d377a0 2321
67871254 2322 while (1) {
98d377a0
TH		 2323 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2324 if (ret < 0)
2325 goto out;
18674c6c
FDBM		 2326 else if (ret > 0) {
2327 ret = btrfs_previous_item(root, path, dirid,
2328 BTRFS_INODE_REF_KEY);
2329 if (ret < 0)
2330 goto out;
2331 else if (ret > 0) {
2332 ret = -ENOENT;
2333 goto out;
2334 }
2335 }
98d377a0
TH		 2336
2337 l = path->nodes[0];
2338 slot = path->slots[0];
2339 btrfs_item_key_to_cpu(l, &key, slot);
2340
98d377a0
TH		 2341 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2342 len = btrfs_inode_ref_name_len(l, iref);
2343 ptr -= len + 1;
2344 total_len += len + 1;
a696cf35
FDBM		 2345 if (ptr < name) {
2346 ret = -ENAMETOOLONG;
98d377a0 2347 goto out;
a696cf35 2348 }
98d377a0
TH		 2349
2350 *(ptr + len) = '/';
67871254 2351 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
98d377a0
TH		 2352
2353 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2354 break;
2355
b3b4aa74 2356 btrfs_release_path(path);
98d377a0 2357 key.objectid = key.offset;
8ad6fcab 2358 key.offset = (u64)-1;
98d377a0 2359 dirid = key.objectid;
98d377a0 2360 }
77906a50 2361 memmove(name, ptr, total_len);
67871254 2362 name[total_len] = '\0';
98d377a0
TH		 2363 ret = 0;
2364out:
2365 btrfs_free_path(path);
ac8e9819
CM		 2366 return ret;
2367}
2368
23d0b79d
TM		 2369static int btrfs_search_path_in_tree_user(struct inode *inode,
2370 struct btrfs_ioctl_ino_lookup_user_args *args)
2371{
2372 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2373 struct super_block *sb = inode->i_sb;
2374 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2375 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2376 u64 dirid = args->dirid;
2377 unsigned long item_off;
2378 unsigned long item_len;
2379 struct btrfs_inode_ref *iref;
2380 struct btrfs_root_ref *rref;
2381 struct btrfs_root *root;
2382 struct btrfs_path *path;
2383 struct btrfs_key key, key2;
2384 struct extent_buffer *leaf;
2385 struct inode *temp_inode;
2386 char *ptr;
2387 int slot;
2388 int len;
2389 int total_len = 0;
2390 int ret;
2391
2392 path = btrfs_alloc_path();
2393 if (!path)
2394 return -ENOMEM;
2395
2396 /*
2397 * If the bottom subvolume does not exist directly under upper_limit,
2398 * construct the path in from the bottom up.
2399 */
2400 if (dirid != upper_limit.objectid) {
2401 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2402
2403 key.objectid = treeid;
2404 key.type = BTRFS_ROOT_ITEM_KEY;
2405 key.offset = (u64)-1;
2406 root = btrfs_read_fs_root_no_name(fs_info, &key);
2407 if (IS_ERR(root)) {
2408 ret = PTR_ERR(root);
2409 goto out;
2410 }
2411
2412 key.objectid = dirid;
2413 key.type = BTRFS_INODE_REF_KEY;
2414 key.offset = (u64)-1;
2415 while (1) {
2416 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2417 if (ret < 0) {
2418 goto out;
2419 } else if (ret > 0) {
2420 ret = btrfs_previous_item(root, path, dirid,
2421 BTRFS_INODE_REF_KEY);
2422 if (ret < 0) {
2423 goto out;
2424 } else if (ret > 0) {
2425 ret = -ENOENT;
2426 goto out;
2427 }
2428 }
2429
2430 leaf = path->nodes[0];
2431 slot = path->slots[0];
2432 btrfs_item_key_to_cpu(leaf, &key, slot);
2433
2434 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2435 len = btrfs_inode_ref_name_len(leaf, iref);
2436 ptr -= len + 1;
2437 total_len += len + 1;
2438 if (ptr < args->path) {
2439 ret = -ENAMETOOLONG;
2440 goto out;
2441 }
2442
2443 *(ptr + len) = '/';
2444 read_extent_buffer(leaf, ptr,
2445 (unsigned long)(iref + 1), len);
2446
2447 /* Check the read+exec permission of this directory */
2448 ret = btrfs_previous_item(root, path, dirid,
2449 BTRFS_INODE_ITEM_KEY);
2450 if (ret < 0) {
2451 goto out;
2452 } else if (ret > 0) {
2453 ret = -ENOENT;
2454 goto out;
2455 }
2456
2457 leaf = path->nodes[0];
2458 slot = path->slots[0];
2459 btrfs_item_key_to_cpu(leaf, &key2, slot);
2460 if (key2.objectid != dirid) {
2461 ret = -ENOENT;
2462 goto out;
2463 }
2464
4c66e0d4 2465 temp_inode = btrfs_iget(sb, &key2, root);
3ca57bd6
MT		 2466 if (IS_ERR(temp_inode)) {
2467 ret = PTR_ERR(temp_inode);
2468 goto out;
2469 }
23d0b79d
TM		 2470 ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
2471 iput(temp_inode);
2472 if (ret) {
2473 ret = -EACCES;
2474 goto out;
2475 }
2476
2477 if (key.offset == upper_limit.objectid)
2478 break;
2479 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2480 ret = -EACCES;
2481 goto out;
2482 }
2483
2484 btrfs_release_path(path);
2485 key.objectid = key.offset;
2486 key.offset = (u64)-1;
2487 dirid = key.objectid;
2488 }
2489
2490 memmove(args->path, ptr, total_len);
2491 args->path[total_len] = '\0';
2492 btrfs_release_path(path);
2493 }
2494
2495 /* Get the bottom subvolume's name from ROOT_REF */
2496 root = fs_info->tree_root;
2497 key.objectid = treeid;
2498 key.type = BTRFS_ROOT_REF_KEY;
2499 key.offset = args->treeid;
2500 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2501 if (ret < 0) {
2502 goto out;
2503 } else if (ret > 0) {
2504 ret = -ENOENT;
2505 goto out;
2506 }
2507
2508 leaf = path->nodes[0];
2509 slot = path->slots[0];
2510 btrfs_item_key_to_cpu(leaf, &key, slot);
2511
2512 item_off = btrfs_item_ptr_offset(leaf, slot);
2513 item_len = btrfs_item_size_nr(leaf, slot);
2514 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2515 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2516 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2517 ret = -EINVAL;
2518 goto out;
2519 }
2520
2521 /* Copy subvolume's name */
2522 item_off += sizeof(struct btrfs_root_ref);
2523 item_len -= sizeof(struct btrfs_root_ref);
2524 read_extent_buffer(leaf, args->name, item_off, item_len);
2525 args->name[item_len] = 0;
2526
2527out:
2528 btrfs_free_path(path);
2529 return ret;
2530}
2531
ac8e9819
CM		 2532static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2533 void __user *argp)
2534{
bece2e82
BVA		 2535 struct btrfs_ioctl_ino_lookup_args *args;
2536 struct inode *inode;
01b810b8 2537 int ret = 0;
ac8e9819 2538
2354d08f
JL		 2539 args = memdup_user(argp, sizeof(*args));
2540 if (IS_ERR(args))
2541 return PTR_ERR(args);
c2b96929 2542
496ad9aa 2543 inode = file_inode(file);
ac8e9819 2544
01b810b8
DS		 2545 /*
2546 * Unprivileged query to obtain the containing subvolume root id. The
2547 * path is reset so it's consistent with btrfs_search_path_in_tree.
2548 */
1b53ac4d
CM		 2549 if (args->treeid == 0)
2550 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2551
01b810b8
DS		 2552 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2553 args->name[0] = 0;
2554 goto out;
2555 }
2556
2557 if (!capable(CAP_SYS_ADMIN)) {
2558 ret = -EPERM;
2559 goto out;
2560 }
2561
ac8e9819
CM		 2562 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2563 args->treeid, args->objectid,
2564 args->name);
2565
01b810b8 2566out:
ac8e9819
CM		 2567 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2568 ret = -EFAULT;
2569
2570 kfree(args);
98d377a0
TH		 2571 return ret;
2572}
2573
23d0b79d
TM		 2574/*
2575 * Version of ino_lookup ioctl (unprivileged)
2576 *
2577 * The main differences from ino_lookup ioctl are:
2578 *
2579 * 1. Read + Exec permission will be checked using inode_permission() during
2580 * path construction. -EACCES will be returned in case of failure.
2581 * 2. Path construction will be stopped at the inode number which corresponds
2582 * to the fd with which this ioctl is called. If constructed path does not
2583 * exist under fd's inode, -EACCES will be returned.
2584 * 3. The name of bottom subvolume is also searched and filled.
2585 */
2586static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2587{
2588 struct btrfs_ioctl_ino_lookup_user_args *args;
2589 struct inode *inode;
2590 int ret;
2591
2592 args = memdup_user(argp, sizeof(*args));
2593 if (IS_ERR(args))
2594 return PTR_ERR(args);
2595
2596 inode = file_inode(file);
2597
2598 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2599 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2600 /*
2601 * The subvolume does not exist under fd with which this is
2602 * called
2603 */
2604 kfree(args);
2605 return -EACCES;
2606 }
2607
2608 ret = btrfs_search_path_in_tree_user(inode, args);
2609
2610 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2611 ret = -EFAULT;
2612
2613 kfree(args);
2614 return ret;
2615}
2616
b64ec075
TM		 2617/* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2618static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2619{
2620 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2621 struct btrfs_fs_info *fs_info;
2622 struct btrfs_root *root;
2623 struct btrfs_path *path;
2624 struct btrfs_key key;
2625 struct btrfs_root_item *root_item;
2626 struct btrfs_root_ref *rref;
2627 struct extent_buffer *leaf;
2628 unsigned long item_off;
2629 unsigned long item_len;
2630 struct inode *inode;
2631 int slot;
2632 int ret = 0;
2633
2634 path = btrfs_alloc_path();
2635 if (!path)
2636 return -ENOMEM;
2637
2638 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2639 if (!subvol_info) {
2640 btrfs_free_path(path);
2641 return -ENOMEM;
2642 }
2643
2644 inode = file_inode(file);
2645 fs_info = BTRFS_I(inode)->root->fs_info;
2646
2647 /* Get root_item of inode's subvolume */
2648 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2649 key.type = BTRFS_ROOT_ITEM_KEY;
2650 key.offset = (u64)-1;
2651 root = btrfs_read_fs_root_no_name(fs_info, &key);
2652 if (IS_ERR(root)) {
2653 ret = PTR_ERR(root);
2654 goto out;
2655 }
2656 root_item = &root->root_item;
2657
2658 subvol_info->treeid = key.objectid;
2659
2660 subvol_info->generation = btrfs_root_generation(root_item);
2661 subvol_info->flags = btrfs_root_flags(root_item);
2662
2663 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2664 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2665 BTRFS_UUID_SIZE);
2666 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2667 BTRFS_UUID_SIZE);
2668
2669 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2670 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2671 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2672
2673 subvol_info->otransid = btrfs_root_otransid(root_item);
2674 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2675 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2676
2677 subvol_info->stransid = btrfs_root_stransid(root_item);
2678 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2679 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2680
2681 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2682 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2683 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2684
2685 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2686 /* Search root tree for ROOT_BACKREF of this subvolume */
2687 root = fs_info->tree_root;
2688
2689 key.type = BTRFS_ROOT_BACKREF_KEY;
2690 key.offset = 0;
2691 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2692 if (ret < 0) {
2693 goto out;
2694 } else if (path->slots[0] >=
2695 btrfs_header_nritems(path->nodes[0])) {
2696 ret = btrfs_next_leaf(root, path);
2697 if (ret < 0) {
2698 goto out;
2699 } else if (ret > 0) {
2700 ret = -EUCLEAN;
2701 goto out;
2702 }
2703 }
2704
2705 leaf = path->nodes[0];
2706 slot = path->slots[0];
2707 btrfs_item_key_to_cpu(leaf, &key, slot);
2708 if (key.objectid == subvol_info->treeid &&
2709 key.type == BTRFS_ROOT_BACKREF_KEY) {
2710 subvol_info->parent_id = key.offset;
2711
2712 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2713 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2714
2715 item_off = btrfs_item_ptr_offset(leaf, slot)
2716 + sizeof(struct btrfs_root_ref);
2717 item_len = btrfs_item_size_nr(leaf, slot)
2718 - sizeof(struct btrfs_root_ref);
2719 read_extent_buffer(leaf, subvol_info->name,
2720 item_off, item_len);
2721 } else {
2722 ret = -ENOENT;
2723 goto out;
2724 }
2725 }
2726
2727 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2728 ret = -EFAULT;
2729
2730out:
2731 btrfs_free_path(path);
2732 kzfree(subvol_info);
2733 return ret;
2734}
2735
42e4b520
TM		 2736/*
2737 * Return ROOT_REF information of the subvolume containing this inode
2738 * except the subvolume name.
2739 */
2740static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2741{
2742 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2743 struct btrfs_root_ref *rref;
2744 struct btrfs_root *root;
2745 struct btrfs_path *path;
2746 struct btrfs_key key;
2747 struct extent_buffer *leaf;
2748 struct inode *inode;
2749 u64 objectid;
2750 int slot;
2751 int ret;
2752 u8 found;
2753
2754 path = btrfs_alloc_path();
2755 if (!path)
2756 return -ENOMEM;
2757
2758 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2759 if (IS_ERR(rootrefs)) {
2760 btrfs_free_path(path);
2761 return PTR_ERR(rootrefs);
2762 }
2763
2764 inode = file_inode(file);
2765 root = BTRFS_I(inode)->root->fs_info->tree_root;
2766 objectid = BTRFS_I(inode)->root->root_key.objectid;
2767
2768 key.objectid = objectid;
2769 key.type = BTRFS_ROOT_REF_KEY;
2770 key.offset = rootrefs->min_treeid;
2771 found = 0;
2772
2773 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2774 if (ret < 0) {
2775 goto out;
2776 } else if (path->slots[0] >=
2777 btrfs_header_nritems(path->nodes[0])) {
2778 ret = btrfs_next_leaf(root, path);
2779 if (ret < 0) {
2780 goto out;
2781 } else if (ret > 0) {
2782 ret = -EUCLEAN;
2783 goto out;
2784 }
2785 }
2786 while (1) {
2787 leaf = path->nodes[0];
2788 slot = path->slots[0];
2789
2790 btrfs_item_key_to_cpu(leaf, &key, slot);
2791 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2792 ret = 0;
2793 goto out;
2794 }
2795
2796 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2797 ret = -EOVERFLOW;
2798 goto out;
2799 }
2800
2801 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2802 rootrefs->rootref[found].treeid = key.offset;
2803 rootrefs->rootref[found].dirid =
2804 btrfs_root_ref_dirid(leaf, rref);
2805 found++;
2806
2807 ret = btrfs_next_item(root, path);
2808 if (ret < 0) {
2809 goto out;
2810 } else if (ret > 0) {
2811 ret = -EUCLEAN;
2812 goto out;
2813 }
2814 }
2815
2816out:
2817 if (!ret || ret == -EOVERFLOW) {
2818 rootrefs->num_items = found;
2819 /* update min_treeid for next search */
2820 if (found)
2821 rootrefs->min_treeid =
2822 rootrefs->rootref[found - 1].treeid + 1;
2823 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2824 ret = -EFAULT;
2825 }
2826
2827 kfree(rootrefs);
2828 btrfs_free_path(path);
2829
2830 return ret;
2831}
2832
76dda93c
YZ		 2833static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2834 void __user *arg)
2835{
54563d41 2836 struct dentry *parent = file->f_path.dentry;
0b246afa 2837 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
76dda93c 2838 struct dentry *dentry;
2b0143b5 2839 struct inode *dir = d_inode(parent);
76dda93c
YZ		 2840 struct inode *inode;
2841 struct btrfs_root *root = BTRFS_I(dir)->root;
2842 struct btrfs_root *dest = NULL;
2843 struct btrfs_ioctl_vol_args *vol_args;
76dda93c 2844 int namelen;
76dda93c
YZ		 2845 int err = 0;
2846
325c50e3
JM		 2847 if (!S_ISDIR(dir->i_mode))
2848 return -ENOTDIR;
2849
76dda93c
YZ		 2850 vol_args = memdup_user(arg, sizeof(*vol_args));
2851 if (IS_ERR(vol_args))
2852 return PTR_ERR(vol_args);
2853
2854 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2855 namelen = strlen(vol_args->name);
2856 if (strchr(vol_args->name, '/') ||
2857 strncmp(vol_args->name, "..", namelen) == 0) {
2858 err = -EINVAL;
2859 goto out;
2860 }
2861
a561be71 2862 err = mnt_want_write_file(file);
76dda93c
YZ		 2863 if (err)
2864 goto out;
2865
521e0546 2866
00235411
AV		 2867 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2868 if (err == -EINTR)
2869 goto out_drop_write;
76dda93c
YZ		 2870 dentry = lookup_one_len(vol_args->name, parent, namelen);
2871 if (IS_ERR(dentry)) {
2872 err = PTR_ERR(dentry);
2873 goto out_unlock_dir;
2874 }
2875
2b0143b5 2876 if (d_really_is_negative(dentry)) {
76dda93c
YZ		 2877 err = -ENOENT;
2878 goto out_dput;
2879 }
2880
2b0143b5 2881 inode = d_inode(dentry);
4260f7c7 2882 dest = BTRFS_I(inode)->root;
67871254 2883 if (!capable(CAP_SYS_ADMIN)) {
4260f7c7
SW		 2884 /*
2885 * Regular user. Only allow this with a special mount
2886 * option, when the user has write+exec access to the
2887 * subvol root, and when rmdir(2) would have been
2888 * allowed.
2889 *
2890 * Note that this is _not_ check that the subvol is
2891 * empty or doesn't contain data that we wouldn't
2892 * otherwise be able to delete.
2893 *
2894 * Users who want to delete empty subvols should try
2895 * rmdir(2).
2896 */
2897 err = -EPERM;
0b246afa 2898 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
4260f7c7
SW		 2899 goto out_dput;
2900
2901 /*
2902 * Do not allow deletion if the parent dir is the same
2903 * as the dir to be deleted. That means the ioctl
2904 * must be called on the dentry referencing the root
2905 * of the subvol, not a random directory contained
2906 * within it.
2907 */
2908 err = -EINVAL;
2909 if (root == dest)
2910 goto out_dput;
2911
2912 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2913 if (err)
2914 goto out_dput;
4260f7c7
SW		 2915 }
2916
5c39da5b
MX		 2917 /* check if subvolume may be deleted by a user */
2918 err = btrfs_may_delete(dir, dentry, 1);
2919 if (err)
2920 goto out_dput;
2921
4a0cc7ca 2922 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2923 err = -EINVAL;
2924 goto out_dput;
2925 }
2926
5955102c 2927 inode_lock(inode);
f60a2364 2928 err = btrfs_delete_subvolume(dir, dentry);
5955102c 2929 inode_unlock(inode);
46008d9d
AG		 2930 if (!err) {
2931 fsnotify_rmdir(dir, dentry);
76dda93c 2932 d_delete(dentry);
46008d9d 2933 }
fa6ac876 2934
76dda93c
YZ		 2935out_dput:
2936 dput(dentry);
2937out_unlock_dir:
5955102c 2938 inode_unlock(dir);
00235411 2939out_drop_write:
2a79f17e 2940 mnt_drop_write_file(file);
76dda93c
YZ		 2941out:
2942 kfree(vol_args);
2943 return err;
2944}
2945
1e701a32 2946static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2947{
496ad9aa 2948 struct inode *inode = file_inode(file);
f46b5a66 2949 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2950 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2951 int ret;
2952
25122d15
ID		 2953 ret = mnt_want_write_file(file);
2954 if (ret)
2955 return ret;
b83cc969 2956
25122d15
ID		 2957 if (btrfs_root_readonly(root)) {
2958 ret = -EROFS;
2959 goto out;
5ac00add 2960 }
f46b5a66
CH		 2961
2962 switch (inode->i_mode & S_IFMT) {
2963 case S_IFDIR:
e441d54d
CM		 2964 if (!capable(CAP_SYS_ADMIN)) {
2965 ret = -EPERM;
2966 goto out;
2967 }
de78b51a 2968 ret = btrfs_defrag_root(root);
f46b5a66
CH		 2969 break;
2970 case S_IFREG:
616d374e
AB		 2971 /*
2972 * Note that this does not check the file descriptor for write
2973 * access. This prevents defragmenting executables that are
2974 * running and allows defrag on files open in read-only mode.
2975 */
2976 if (!capable(CAP_SYS_ADMIN) &&
2977 inode_permission(inode, MAY_WRITE)) {
2978 ret = -EPERM;
e441d54d
CM		 2979 goto out;
2980 }
1e701a32
CM		 2981
2982 range = kzalloc(sizeof(*range), GFP_KERNEL);
2983 if (!range) {
2984 ret = -ENOMEM;
2985 goto out;
2986 }
2987
2988 if (argp) {
2989 if (copy_from_user(range, argp,
2990 sizeof(*range))) {
2991 ret = -EFAULT;
2992 kfree(range);
683be16e 2993 goto out;
1e701a32
CM		 2994 }
2995 /* compression requires us to start the IO */
2996 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2997 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2998 range->extent_thresh = (u32)-1;
2999 }
3000 } else {
3001 /* the rest are all set to zero by kzalloc */
3002 range->len = (u64)-1;
3003 }
496ad9aa 3004 ret = btrfs_defrag_file(file_inode(file), file,
7c829b72 3005 range, BTRFS_OLDEST_GENERATION, 0);
4cb5300b
CM		 3006 if (ret > 0)
3007 ret = 0;
1e701a32 3008 kfree(range);
f46b5a66 3009 break;
8929ecfa
YZ		 3010 default:
3011 ret = -EINVAL;
f46b5a66 3012 }
e441d54d 3013out:
25122d15 3014 mnt_drop_write_file(file);
e441d54d 3015 return ret;
f46b5a66
CH		 3016}
3017
2ff7e61e 3018static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
f46b5a66
CH		 3019{
3020 struct btrfs_ioctl_vol_args *vol_args;
3021 int ret;
3022
e441d54d
CM		 3023 if (!capable(CAP_SYS_ADMIN))
3024 return -EPERM;
3025
171938e5 3026 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags))
e57138b3 3027 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b 3028
dae7b665 3029 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 3030 if (IS_ERR(vol_args)) {
3031 ret = PTR_ERR(vol_args);
3032 goto out;
3033 }
f46b5a66 3034
5516e595 3035 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2ff7e61e 3036 ret = btrfs_init_new_device(fs_info, vol_args->name);
f46b5a66 3037
43d20761 3038 if (!ret)
0b246afa 3039 btrfs_info(fs_info, "disk added %s", vol_args->name);
43d20761 3040
f46b5a66 3041 kfree(vol_args);
c9e9f97b 3042out:
171938e5 3043 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
f46b5a66
CH		 3044 return ret;
3045}
3046
6b526ed7 3047static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
f46b5a66 3048{
0b246afa
JM		 3049 struct inode *inode = file_inode(file);
3050 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
6b526ed7 3051 struct btrfs_ioctl_vol_args_v2 *vol_args;
f46b5a66
CH		 3052 int ret;
3053
e441d54d
CM		 3054 if (!capable(CAP_SYS_ADMIN))
3055 return -EPERM;
3056
da24927b
MX		 3057 ret = mnt_want_write_file(file);
3058 if (ret)
3059 return ret;
c146afad 3060
dae7b665 3061 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 3062 if (IS_ERR(vol_args)) {
3063 ret = PTR_ERR(vol_args);
c47ca32d 3064 goto err_drop;
c9e9f97b 3065 }
f46b5a66 3066
6b526ed7 3067 /* Check for compatibility reject unknown flags */
fd4e994b
OS		 3068 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
3069 ret = -EOPNOTSUPP;
3070 goto out;
3071 }
f46b5a66 3072
171938e5 3073 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
183860f6
AJ		 3074 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3075 goto out;
3076 }
3077
735654ea 3078 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2ff7e61e 3079 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
6b526ed7
AJ		 3080 } else {
3081 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
2ff7e61e 3082 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
6b526ed7 3083 }
171938e5 3084 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
183860f6 3085
6b526ed7 3086 if (!ret) {
735654ea 3087 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
0b246afa 3088 btrfs_info(fs_info, "device deleted: id %llu",
6b526ed7
AJ		 3089 vol_args->devid);
3090 else
0b246afa 3091 btrfs_info(fs_info, "device deleted: %s",
6b526ed7
AJ		 3092 vol_args->name);
3093 }
183860f6
AJ		 3094out:
3095 kfree(vol_args);
c47ca32d 3096err_drop:
4ac20c70 3097 mnt_drop_write_file(file);
f46b5a66
CH		 3098 return ret;
3099}
3100
da24927b 3101static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 3102{
0b246afa
JM		 3103 struct inode *inode = file_inode(file);
3104 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f46b5a66
CH		 3105 struct btrfs_ioctl_vol_args *vol_args;
3106 int ret;
3107
e441d54d
CM		 3108 if (!capable(CAP_SYS_ADMIN))
3109 return -EPERM;
3110
da24927b
MX		 3111 ret = mnt_want_write_file(file);
3112 if (ret)
3113 return ret;
c146afad 3114
171938e5 3115 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
183860f6 3116 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
58d7bbf8
DS		 3117 goto out_drop_write;
3118 }
3119
3120 vol_args = memdup_user(arg, sizeof(*vol_args));
3121 if (IS_ERR(vol_args)) {
3122 ret = PTR_ERR(vol_args);
183860f6
AJ		 3123 goto out;
3124 }
3125
58d7bbf8 3126 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2ff7e61e 3127 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
183860f6 3128
ec95d491 3129 if (!ret)
0b246afa 3130 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
183860f6 3131 kfree(vol_args);
58d7bbf8 3132out:
171938e5 3133 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
58d7bbf8 3134out_drop_write:
4ac20c70 3135 mnt_drop_write_file(file);
58d7bbf8 3136
f46b5a66
CH		 3137 return ret;
3138}
3139
2ff7e61e
JM		 3140static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3141 void __user *arg)
475f6387 3142{
027ed2f0 3143 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387 3144 struct btrfs_device *device;
0b246afa 3145 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
027ed2f0 3146 int ret = 0;
475f6387 3147
027ed2f0
LZ		 3148 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
3149 if (!fi_args)
3150 return -ENOMEM;
3151
d03262c7 3152 rcu_read_lock();
027ed2f0 3153 fi_args->num_devices = fs_devices->num_devices;
475f6387 3154
d03262c7 3155 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 3156 if (device->devid > fi_args->max_id)
3157 fi_args->max_id = device->devid;
475f6387 3158 }
d03262c7 3159 rcu_read_unlock();
475f6387 3160
de37aa51 3161 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
bea7eafd
OS		 3162 fi_args->nodesize = fs_info->nodesize;
3163 fi_args->sectorsize = fs_info->sectorsize;
3164 fi_args->clone_alignment = fs_info->sectorsize;
80a773fb 3165
027ed2f0
LZ		 3166 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3167 ret = -EFAULT;
475f6387 3168
027ed2f0
LZ		 3169 kfree(fi_args);
3170 return ret;
475f6387
JS		 3171}
3172
2ff7e61e
JM		 3173static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3174 void __user *arg)
475f6387
JS		 3175{
3176 struct btrfs_ioctl_dev_info_args *di_args;
3177 struct btrfs_device *dev;
475f6387
JS		 3178 int ret = 0;
3179 char *s_uuid = NULL;
475f6387 3180
475f6387
JS		 3181 di_args = memdup_user(arg, sizeof(*di_args));
3182 if (IS_ERR(di_args))
3183 return PTR_ERR(di_args);
3184
dd5f9615 3185 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 3186 s_uuid = di_args->uuid;
3187
c5593ca3 3188 rcu_read_lock();
e4319cd9 3189 dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid,
09ba3bc9 3190 NULL, true);
475f6387
JS		 3191
3192 if (!dev) {
3193 ret = -ENODEV;
3194 goto out;
3195 }
3196
3197 di_args->devid = dev->devid;
7cc8e58d
MX		 3198 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3199 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
475f6387 3200 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 3201 if (dev->name) {
672d5990
MT		 3202 strncpy(di_args->path, rcu_str_deref(dev->name),
3203 sizeof(di_args->path) - 1);
a27202fb
JM		 3204 di_args->path[sizeof(di_args->path) - 1] = 0;
3205 } else {
99ba55ad 3206 di_args->path[0] = '\0';
a27202fb 3207 }
475f6387
JS		 3208
3209out:
c5593ca3 3210 rcu_read_unlock();
475f6387
JS		 3211 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3212 ret = -EFAULT;
3213
3214 kfree(di_args);
3215 return ret;
3216}
3217
d8b55242
FM		 3218static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
3219 struct inode *inode2, u64 loff2, u64 len)
3220{
3221 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3222 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3223}
3224
3225static void btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
3226 struct inode *inode2, u64 loff2, u64 len)
3227{
3228 if (inode1 < inode2) {
3229 swap(inode1, inode2);
3230 swap(loff1, loff2);
3231 } else if (inode1 == inode2 && loff2 < loff1) {
3232 swap(loff1, loff2);
3233 }
3234 lock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
3235 lock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
3236}
3237
57a50e25 3238static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,
34a28e3d 3239 struct inode *dst, u64 dst_loff)
416161db
MF		 3240{
3241 int ret;
f4414602 3242
34a28e3d 3243 /*
d8b55242
FM		 3244 * Lock destination range to serialize with concurrent readpages() and
3245 * source range to serialize with relocation.
34a28e3d 3246 */
d8b55242 3247 btrfs_double_extent_lock(src, loff, dst, dst_loff, len);
57a50e25 3248 ret = btrfs_clone(src, dst, loff, len, len, dst_loff, 1);
d8b55242 3249 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3973909d
TT		 3250
3251 return ret;
3252}
3253
b6728768
TT		 3254#define BTRFS_MAX_DEDUPE_LEN SZ_16M
3255
3973909d
TT		 3256static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3257 struct inode *dst, u64 dst_loff)
3258{
3259 int ret;
b6728768 3260 u64 i, tail_len, chunk_count;
62d54f3a
FM		 3261 struct btrfs_root *root_dst = BTRFS_I(dst)->root;
3262
3263 spin_lock(&root_dst->root_item_lock);
3264 if (root_dst->send_in_progress) {
3265 btrfs_warn_rl(root_dst->fs_info,
3266"cannot deduplicate to root %llu while send operations are using it (%d in progress)",
3267 root_dst->root_key.objectid,
3268 root_dst->send_in_progress);
3269 spin_unlock(&root_dst->root_item_lock);
3270 return -EAGAIN;
3271 }
3272 root_dst->dedupe_in_progress++;
3273 spin_unlock(&root_dst->root_item_lock);
3973909d 3274
b6728768
TT		 3275 tail_len = olen % BTRFS_MAX_DEDUPE_LEN;
3276 chunk_count = div_u64(olen, BTRFS_MAX_DEDUPE_LEN);
67b07bd4 3277
b6728768
TT		 3278 for (i = 0; i < chunk_count; i++) {
3279 ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
34a28e3d 3280 dst, dst_loff);
b6728768 3281 if (ret)
62d54f3a 3282 goto out;
b6728768
TT		 3283
3284 loff += BTRFS_MAX_DEDUPE_LEN;
3285 dst_loff += BTRFS_MAX_DEDUPE_LEN;
3286 }
3287
3288 if (tail_len > 0)
67b07bd4 3289 ret = btrfs_extent_same_range(src, loff, tail_len, dst,
34a28e3d 3290 dst_loff);
62d54f3a
FM		 3291out:
3292 spin_lock(&root_dst->root_item_lock);
3293 root_dst->dedupe_in_progress--;
3294 spin_unlock(&root_dst->root_item_lock);
416161db
MF		 3295
3296 return ret;
3297}
3298
f82a9901
FM		 3299static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3300 struct inode *inode,
3301 u64 endoff,
3302 const u64 destoff,
1c919a5e
MF		 3303 const u64 olen,
3304 int no_time_update)
f82a9901
FM		 3305{
3306 struct btrfs_root *root = BTRFS_I(inode)->root;
3307 int ret;
3308
3309 inode_inc_iversion(inode);
1c919a5e 3310 if (!no_time_update)
c2050a45 3311 inode->i_mtime = inode->i_ctime = current_time(inode);
f82a9901
FM		 3312 /*
3313 * We round up to the block size at eof when determining which
3314 * extents to clone above, but shouldn't round up the file size.
3315 */
3316 if (endoff > destoff + olen)
3317 endoff = destoff + olen;
3318 if (endoff > inode->i_size)
6ef06d27 3319 btrfs_i_size_write(BTRFS_I(inode), endoff);
f82a9901
FM		 3320
3321 ret = btrfs_update_inode(trans, root, inode);
3322 if (ret) {
66642832 3323 btrfs_abort_transaction(trans, ret);
3a45bb20 3324 btrfs_end_transaction(trans);
f82a9901
FM		 3325 goto out;
3326 }
3a45bb20 3327 ret = btrfs_end_transaction(trans);
f82a9901
FM		 3328out:
3329 return ret;
3330}
3331
8039d87d
FM		 3332/*
3333 * Make sure we do not end up inserting an inline extent into a file that has
3334 * already other (non-inline) extents. If a file has an inline extent it can
3335 * not have any other extents and the (single) inline extent must start at the
3336 * file offset 0. Failing to respect these rules will lead to file corruption,
3337 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3338 *
3339 * We can have extents that have been already written to disk or we can have
3340 * dirty ranges still in delalloc, in which case the extent maps and items are
3341 * created only when we run delalloc, and the delalloc ranges might fall outside
3342 * the range we are currently locking in the inode's io tree. So we check the
3343 * inode's i_size because of that (i_size updates are done while holding the
3344 * i_mutex, which we are holding here).
3345 * We also check to see if the inode has a size not greater than "datal" but has
3346 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3347 * protected against such concurrent fallocate calls by the i_mutex).
3348 *
3349 * If the file has no extents but a size greater than datal, do not allow the
3350 * copy because we would need turn the inline extent into a non-inline one (even
3351 * with NO_HOLES enabled). If we find our destination inode only has one inline
3352 * extent, just overwrite it with the source inline extent if its size is less
3353 * than the source extent's size, or we could copy the source inline extent's
3354 * data into the destination inode's inline extent if the later is greater then
3355 * the former.
3356 */
4a0ab9d7 3357static int clone_copy_inline_extent(struct inode *dst,
8039d87d
FM		 3358 struct btrfs_trans_handle *trans,
3359 struct btrfs_path *path,
3360 struct btrfs_key *new_key,
3361 const u64 drop_start,
3362 const u64 datal,
3363 const u64 skip,
3364 const u64 size,
3365 char *inline_data)
3366{
0b246afa 3367 struct btrfs_fs_info *fs_info = btrfs_sb(dst->i_sb);
8039d87d
FM		 3368 struct btrfs_root *root = BTRFS_I(dst)->root;
3369 const u64 aligned_end = ALIGN(new_key->offset + datal,
0b246afa 3370 fs_info->sectorsize);
8039d87d
FM		 3371 int ret;
3372 struct btrfs_key key;
3373
3374 if (new_key->offset > 0)
3375 return -EOPNOTSUPP;
3376
4a0cc7ca 3377 key.objectid = btrfs_ino(BTRFS_I(dst));
8039d87d
FM		 3378 key.type = BTRFS_EXTENT_DATA_KEY;
3379 key.offset = 0;
3380 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3381 if (ret < 0) {
3382 return ret;
3383 } else if (ret > 0) {
3384 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3385 ret = btrfs_next_leaf(root, path);
3386 if (ret < 0)
3387 return ret;
3388 else if (ret > 0)
3389 goto copy_inline_extent;
3390 }
3391 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
4a0cc7ca 3392 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
8039d87d
FM		 3393 key.type == BTRFS_EXTENT_DATA_KEY) {
3394 ASSERT(key.offset > 0);
3395 return -EOPNOTSUPP;
3396 }
3397 } else if (i_size_read(dst) <= datal) {
3398 struct btrfs_file_extent_item *ei;
3399 u64 ext_len;
3400
3401 /*
3402 * If the file size is <= datal, make sure there are no other
3403 * extents following (can happen do to an fallocate call with
3404 * the flag FALLOC_FL_KEEP_SIZE).
3405 */
3406 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3407 struct btrfs_file_extent_item);
3408 /*
3409 * If it's an inline extent, it can not have other extents
3410 * following it.
3411 */
3412 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3413 BTRFS_FILE_EXTENT_INLINE)
3414 goto copy_inline_extent;
3415
3416 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3417 if (ext_len > aligned_end)
3418 return -EOPNOTSUPP;
3419
3420 ret = btrfs_next_item(root, path);
3421 if (ret < 0) {
3422 return ret;
3423 } else if (ret == 0) {
3424 btrfs_item_key_to_cpu(path->nodes[0], &key,
3425 path->slots[0]);
4a0cc7ca 3426 if (key.objectid == btrfs_ino(BTRFS_I(dst)) &&
8039d87d
FM		 3427 key.type == BTRFS_EXTENT_DATA_KEY)
3428 return -EOPNOTSUPP;
3429 }
3430 }
3431
3432copy_inline_extent:
3433 /*
3434 * We have no extent items, or we have an extent at offset 0 which may
3435 * or may not be inlined. All these cases are dealt the same way.
3436 */
3437 if (i_size_read(dst) > datal) {
3438 /*
3439 * If the destination inode has an inline extent...
3440 * This would require copying the data from the source inline
3441 * extent into the beginning of the destination's inline extent.
3442 * But this is really complex, both extents can be compressed
3443 * or just one of them, which would require decompressing and
3444 * re-compressing data (which could increase the new compressed
3445 * size, not allowing the compressed data to fit anymore in an
3446 * inline extent).
3447 * So just don't support this case for now (it should be rare,
3448 * we are not really saving space when cloning inline extents).
3449 */
3450 return -EOPNOTSUPP;
3451 }
3452
3453 btrfs_release_path(path);
3454 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3455 if (ret)
3456 return ret;
3457 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3458 if (ret)
3459 return ret;
3460
3461 if (skip) {
3462 const u32 start = btrfs_file_extent_calc_inline_size(0);
3463
3464 memmove(inline_data + start, inline_data + start + skip, datal);
3465 }
3466
3467 write_extent_buffer(path->nodes[0], inline_data,
3468 btrfs_item_ptr_offset(path->nodes[0],
3469 path->slots[0]),
3470 size);
3471 inode_add_bytes(dst, datal);
690a5dbf 3472 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(dst)->runtime_flags);
8039d87d
FM		 3473
3474 return 0;
3475}
3476
32b7c687
MF		 3477/**
3478 * btrfs_clone() - clone a range from inode file to another
3479 *
3480 * @src: Inode to clone from
3481 * @inode: Inode to clone to
3482 * @off: Offset within source to start clone from
3483 * @olen: Original length, passed by user, of range to clone
1c919a5e 3484 * @olen_aligned: Block-aligned value of olen
32b7c687 3485 * @destoff: Offset within @inode to start clone
1c919a5e 3486 * @no_time_update: Whether to update mtime/ctime on the target inode
32b7c687
MF		 3487 */
3488static int btrfs_clone(struct inode *src, struct inode *inode,
f82a9901 3489 const u64 off, const u64 olen, const u64 olen_aligned,
1c919a5e 3490 const u64 destoff, int no_time_update)
f46b5a66 3491{
0b246afa 3492 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
f46b5a66 3493 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 3494 struct btrfs_path *path = NULL;
f46b5a66 3495 struct extent_buffer *leaf;
32b7c687
MF		 3496 struct btrfs_trans_handle *trans;
3497 char *buf = NULL;
ae01a0ab 3498 struct btrfs_key key;
f46b5a66
CH		 3499 u32 nritems;
3500 int slot;
ae01a0ab 3501 int ret;
f82a9901 3502 const u64 len = olen_aligned;
f82a9901 3503 u64 last_dest_end = destoff;
ae01a0ab
YZ		 3504
3505 ret = -ENOMEM;
752ade68
MH		 3506 buf = kvmalloc(fs_info->nodesize, GFP_KERNEL);
3507 if (!buf)
3508 return ret;
ae01a0ab
YZ		 3509
3510 path = btrfs_alloc_path();
3511 if (!path) {
15351955 3512 kvfree(buf);
32b7c687 3513 return ret;
d525e8ab
LZ		 3514 }
3515
e4058b54 3516 path->reada = READA_FORWARD;
c5c9cd4d 3517 /* clone data */
4a0cc7ca 3518 key.objectid = btrfs_ino(BTRFS_I(src));
ae01a0ab 3519 key.type = BTRFS_EXTENT_DATA_KEY;
2c463823 3520 key.offset = off;
f46b5a66
CH		 3521
3522 while (1) {
de249e66 3523 u64 next_key_min_offset = key.offset + 1;
b64119b5
FM		 3524 struct btrfs_file_extent_item *extent;
3525 int type;
3526 u32 size;
3527 struct btrfs_key new_key;
3528 u64 disko = 0, diskl = 0;
3529 u64 datao = 0, datal = 0;
3530 u8 comp;
3531 u64 drop_start;
df858e76 3532
f46b5a66
CH		 3533 /*
3534 * note the key will change type as we walk through the
3535 * tree.
3536 */
e4355f34 3537 path->leave_spinning = 1;
362a20c5
DS		 3538 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3539 0, 0);
f46b5a66
CH		 3540 if (ret < 0)
3541 goto out;
2c463823
FM		 3542 /*
3543 * First search, if no extent item that starts at offset off was
3544 * found but the previous item is an extent item, it's possible
3545 * it might overlap our target range, therefore process it.
3546 */
3547 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3548 btrfs_item_key_to_cpu(path->nodes[0], &key,
3549 path->slots[0] - 1);
3550 if (key.type == BTRFS_EXTENT_DATA_KEY)
3551 path->slots[0]--;
3552 }
f46b5a66 3553
ae01a0ab 3554 nritems = btrfs_header_nritems(path->nodes[0]);
e4355f34 3555process_slot:
ae01a0ab 3556 if (path->slots[0] >= nritems) {
362a20c5 3557 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 3558 if (ret < 0)
3559 goto out;
3560 if (ret > 0)
3561 break;
ae01a0ab 3562 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 3563 }
3564 leaf = path->nodes[0];
3565 slot = path->slots[0];
f46b5a66 3566
ae01a0ab 3567 btrfs_item_key_to_cpu(leaf, &key, slot);
962a298f 3568 if (key.type > BTRFS_EXTENT_DATA_KEY ||
4a0cc7ca 3569 key.objectid != btrfs_ino(BTRFS_I(src)))
f46b5a66
CH		 3570 break;
3571
b64119b5 3572 ASSERT(key.type == BTRFS_EXTENT_DATA_KEY);
31840ae1 3573
b64119b5
FM		 3574 extent = btrfs_item_ptr(leaf, slot,
3575 struct btrfs_file_extent_item);
3576 comp = btrfs_file_extent_compression(leaf, extent);
3577 type = btrfs_file_extent_type(leaf, extent);
3578 if (type == BTRFS_FILE_EXTENT_REG ||
3579 type == BTRFS_FILE_EXTENT_PREALLOC) {
3580 disko = btrfs_file_extent_disk_bytenr(leaf, extent);
3581 diskl = btrfs_file_extent_disk_num_bytes(leaf, extent);
3582 datao = btrfs_file_extent_offset(leaf, extent);
3583 datal = btrfs_file_extent_num_bytes(leaf, extent);
3584 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3585 /* Take upper bound, may be compressed */
3586 datal = btrfs_file_extent_ram_bytes(leaf, extent);
3587 }
e4355f34 3588
b64119b5
FM		 3589 /*
3590 * The first search might have left us at an extent item that
3591 * ends before our target range's start, can happen if we have
3592 * holes and NO_HOLES feature enabled.
3593 */
3594 if (key.offset + datal <= off) {
3595 path->slots[0]++;
3596 goto process_slot;
3597 } else if (key.offset >= off + len) {
3598 break;
3599 }
3600 next_key_min_offset = key.offset + datal;
3601 size = btrfs_item_size_nr(leaf, slot);
3602 read_extent_buffer(leaf, buf, btrfs_item_ptr_offset(leaf, slot),
3603 size);
c5c9cd4d 3604
b64119b5
FM		 3605 btrfs_release_path(path);
3606 path->leave_spinning = 0;
3607
3608 memcpy(&new_key, &key, sizeof(new_key));
3609 new_key.objectid = btrfs_ino(BTRFS_I(inode));
3610 if (off <= key.offset)
3611 new_key.offset = key.offset + destoff - off;
3612 else
3613 new_key.offset = destoff;
3614
3615 /*
3616 * Deal with a hole that doesn't have an extent item that
3617 * represents it (NO_HOLES feature enabled).
3618 * This hole is either in the middle of the cloning range or at
3619 * the beginning (fully overlaps it or partially overlaps it).
3620 */
3621 if (new_key.offset != last_dest_end)
3622 drop_start = last_dest_end;
3623 else
3624 drop_start = new_key.offset;
3625
3626 if (type == BTRFS_FILE_EXTENT_REG ||
3627 type == BTRFS_FILE_EXTENT_PREALLOC) {
3628 struct btrfs_clone_extent_info clone_info;
31840ae1 3629
f82a9901 3630 /*
b64119b5
FM		 3631 * a | --- range to clone ---| b
3632 * | ------------- extent ------------- |
f82a9901 3633 */
a22285a6 3634
b64119b5
FM		 3635 /* Subtract range b */
3636 if (key.offset + datal > off + len)
3637 datal = off + len - key.offset;
3638
3639 /* Subtract range a */
3640 if (off > key.offset) {
3641 datao += off - key.offset;
3642 datal -= off - key.offset;
3643 }
3644
3645 clone_info.disk_offset = disko;
3646 clone_info.disk_len = diskl;
3647 clone_info.data_offset = datao;
3648 clone_info.data_len = datal;
3649 clone_info.file_offset = new_key.offset;
3650 clone_info.extent_buf = buf;
3651 clone_info.item_size = size;
3652 ret = btrfs_punch_hole_range(inode, path,
690a5dbf
FM		 3653 drop_start,
3654 new_key.offset + datal - 1,
3655 &clone_info, &trans);
b64119b5
FM		 3656 if (ret)
3657 goto out;
3658 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3659 u64 skip = 0;
3660 u64 trim = 0;
d397712b 3661
b64119b5
FM		 3662 if (off > key.offset) {
3663 skip = off - key.offset;
3664 new_key.offset += skip;
3665 }
d397712b 3666
b64119b5
FM		 3667 if (key.offset + datal > off + len)
3668 trim = key.offset + datal - (off + len);
690a5dbf 3669
b64119b5
FM		 3670 if (comp && (skip || trim)) {
3671 ret = -EINVAL;
3672 goto out;
f46b5a66 3673 }
b64119b5
FM		 3674 size -= skip + trim;
3675 datal -= skip + trim;
c5c9cd4d 3676
b64119b5
FM		 3677 /*
3678 * If our extent is inline, we know we will drop or
3679 * adjust at most 1 extent item in the destination root.
3680 *
3681 * 1 - adjusting old extent (we may have to split it)
3682 * 1 - add new extent
3683 * 1 - inode update
3684 */
3685 trans = btrfs_start_transaction(root, 3);
3686 if (IS_ERR(trans)) {
3687 ret = PTR_ERR(trans);
3688 goto out;
3689 }
c5c9cd4d 3690
b64119b5
FM		 3691 ret = clone_copy_inline_extent(inode, trans, path,
3692 &new_key, drop_start,
3693 datal, skip, size, buf);
3694 if (ret) {
3695 if (ret != -EOPNOTSUPP)
3696 btrfs_abort_transaction(trans, ret);
3697 btrfs_end_transaction(trans);
79787eaa 3698 goto out;
b64119b5 3699 }
a22285a6 3700 }
b64119b5
FM		 3701
3702 btrfs_release_path(path);
3703
3704 last_dest_end = ALIGN(new_key.offset + datal,
3705 fs_info->sectorsize);
3706 ret = clone_finish_inode_update(trans, inode, last_dest_end,
3707 destoff, olen, no_time_update);
3708 if (ret)
3709 goto out;
3710 if (new_key.offset + datal >= destoff + len)
3711 break;
3712
b3b4aa74 3713 btrfs_release_path(path);
df858e76 3714 key.offset = next_key_min_offset;
69ae5e44
WX		 3715
3716 if (fatal_signal_pending(current)) {
3717 ret = -EINTR;
3718 goto out;
3719 }
f46b5a66 3720 }
f46b5a66 3721 ret = 0;
32b7c687 3722
f82a9901 3723 if (last_dest_end < destoff + len) {
690a5dbf 3724 struct btrfs_clone_extent_info clone_info = { 0 };
f82a9901
FM		 3725 /*
3726 * We have an implicit hole (NO_HOLES feature is enabled) that
3727 * fully or partially overlaps our cloning range at its end.
3728 */
3729 btrfs_release_path(path);
690a5dbf 3730 path->leave_spinning = 0;
f82a9901
FM		 3731
3732 /*
690a5dbf
FM		 3733 * We are dealing with a hole and our clone_info already has a
3734 * disk_offset of 0, we only need to fill the data length and
3735 * file offset.
f82a9901 3736 */
690a5dbf
FM		 3737 clone_info.data_len = destoff + len - last_dest_end;
3738 clone_info.file_offset = last_dest_end;
3739 ret = btrfs_punch_hole_range(inode, path,
3740 last_dest_end, destoff + len - 1,
3741 &clone_info, &trans);
3742 if (ret)
f82a9901 3743 goto out;
690a5dbf 3744
f82a9901 3745 ret = clone_finish_inode_update(trans, inode, destoff + len,
1c919a5e 3746 destoff, olen, no_time_update);
f82a9901
FM		 3747 }
3748
f46b5a66 3749out:
32b7c687 3750 btrfs_free_path(path);
15351955 3751 kvfree(buf);
32b7c687
MF		 3752 return ret;
3753}
3754
3db11b2e
ZB		 3755static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3756 u64 off, u64 olen, u64 destoff)
32b7c687 3757{
54563d41 3758 struct inode *inode = file_inode(file);
3db11b2e 3759 struct inode *src = file_inode(file_src);
0b246afa 3760 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
32b7c687
MF		 3761 int ret;
3762 u64 len = olen;
0b246afa 3763 u64 bs = fs_info->sb->s_blocksize;
32b7c687
MF		 3764
3765 /*
3766 * TODO:
3767 * - split compressed inline extents. annoying: we need to
3768 * decompress into destination's address_space (the file offset
3769 * may change, so source mapping won't do), then recompress (or
3770 * otherwise reinsert) a subrange.
00fdf13a
LB		 3771 *
3772 * - split destination inode's inline extents. The inline extents can
3773 * be either compressed or non-compressed.
32b7c687
MF		 3774 */
3775
ac765f83 3776 /*
34a28e3d
FM		 3777 * VFS's generic_remap_file_range_prep() protects us from cloning the
3778 * eof block into the middle of a file, which would result in corruption
3779 * if the file size is not blocksize aligned. So we don't need to check
3780 * for that case here.
ac765f83 3781 */
34a28e3d 3782 if (off + len == src->i_size)
32b7c687 3783 len = ALIGN(src->i_size, bs) - off;
32b7c687
MF		 3784
3785 if (destoff > inode->i_size) {
f7fa1107
FM		 3786 const u64 wb_start = ALIGN_DOWN(inode->i_size, bs);
3787
32b7c687
MF		 3788 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3789 if (ret)
34a28e3d 3790 return ret;
f7fa1107
FM		 3791 /*
3792 * We may have truncated the last block if the inode's size is
3793 * not sector size aligned, so we need to wait for writeback to
3794 * complete before proceeding further, otherwise we can race
3795 * with cloning and attempt to increment a reference to an
3796 * extent that no longer exists (writeback completed right after
3797 * we found the previous extent covering eof and before we
3798 * attempted to increment its reference count).
3799 */
3800 ret = btrfs_wait_ordered_range(inode, wb_start,
3801 destoff - wb_start);
3802 if (ret)
3803 return ret;
32b7c687
MF		 3804 }
3805
c125b8bf 3806 /*
d8b55242
FM		 3807 * Lock destination range to serialize with concurrent readpages() and
3808 * source range to serialize with relocation.
c125b8bf 3809 */
d8b55242 3810 btrfs_double_extent_lock(src, off, inode, destoff, len);
1c919a5e 3811 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
d8b55242 3812 btrfs_double_extent_unlock(src, off, inode, destoff, len);
c125b8bf
FM		 3813 /*
3814 * Truncate page cache pages so that future reads will see the cloned
3815 * data immediately and not the previous data.
3816 */
65bfa658 3817 truncate_inode_pages_range(&inode->i_data,
09cbfeaf
KS		 3818 round_down(destoff, PAGE_SIZE),
3819 round_up(destoff + len, PAGE_SIZE) - 1);
34a28e3d
FM		 3820
3821 return ret;
3822}
3823
3824static int btrfs_remap_file_range_prep(struct file *file_in, loff_t pos_in,
3825 struct file *file_out, loff_t pos_out,
3826 loff_t *len, unsigned int remap_flags)
3827{
3828 struct inode *inode_in = file_inode(file_in);
3829 struct inode *inode_out = file_inode(file_out);
3830 u64 bs = BTRFS_I(inode_out)->root->fs_info->sb->s_blocksize;
3831 bool same_inode = inode_out == inode_in;
3832 u64 wb_len;
3833 int ret;
3834
3835 if (!(remap_flags & REMAP_FILE_DEDUP)) {
3836 struct btrfs_root *root_out = BTRFS_I(inode_out)->root;
3837
3838 if (btrfs_root_readonly(root_out))
3839 return -EROFS;
3840
3841 if (file_in->f_path.mnt != file_out->f_path.mnt ||
3842 inode_in->i_sb != inode_out->i_sb)
3843 return -EXDEV;
3844 }
3845
500710d3
FM		 3846 /* don't make the dst file partly checksummed */
3847 if ((BTRFS_I(inode_in)->flags & BTRFS_INODE_NODATASUM) !=
3848 (BTRFS_I(inode_out)->flags & BTRFS_INODE_NODATASUM)) {
7984ae52 3849 return -EINVAL;
500710d3
FM		 3850 }
3851
34a28e3d
FM		 3852 /*
3853 * Now that the inodes are locked, we need to start writeback ourselves
3854 * and can not rely on the writeback from the VFS's generic helper
3855 * generic_remap_file_range_prep() because:
3856 *
3857 * 1) For compression we must call filemap_fdatawrite_range() range
3858 * twice (btrfs_fdatawrite_range() does it for us), and the generic
3859 * helper only calls it once;
3860 *
3861 * 2) filemap_fdatawrite_range(), called by the generic helper only
3862 * waits for the writeback to complete, i.e. for IO to be done, and
3863 * not for the ordered extents to complete. We need to wait for them
3864 * to complete so that new file extent items are in the fs tree.
3865 */
3866 if (*len == 0 && !(remap_flags & REMAP_FILE_DEDUP))
3867 wb_len = ALIGN(inode_in->i_size, bs) - ALIGN_DOWN(pos_in, bs);
3868 else
3869 wb_len = ALIGN(*len, bs);
3870
3871 /*
3872 * Since we don't lock ranges, wait for ongoing lockless dio writes (as
3873 * any in progress could create its ordered extents after we wait for
3874 * existing ordered extents below).
3875 */
3876 inode_dio_wait(inode_in);
293a8489 3877 if (!same_inode)
34a28e3d
FM		 3878 inode_dio_wait(inode_out);
3879
a94d1d0c
QW		 3880 /*
3881 * Workaround to make sure NOCOW buffered write reach disk as NOCOW.
3882 *
3883 * Btrfs' back references do not have a block level granularity, they
3884 * work at the whole extent level.
3885 * NOCOW buffered write without data space reserved may not be able
3886 * to fall back to CoW due to lack of data space, thus could cause
3887 * data loss.
3888 *
3889 * Here we take a shortcut by flushing the whole inode, so that all
3890 * nocow write should reach disk as nocow before we increase the
3891 * reference of the extent. We could do better by only flushing NOCOW
3892 * data, but that needs extra accounting.
3893 *
3894 * Also we don't need to check ASYNC_EXTENT, as async extent will be
3895 * CoWed anyway, not affecting nocow part.
3896 */
3897 ret = filemap_flush(inode_in->i_mapping);
3898 if (ret < 0)
3899 return ret;
3900
34a28e3d
FM		 3901 ret = btrfs_wait_ordered_range(inode_in, ALIGN_DOWN(pos_in, bs),
3902 wb_len);
3903 if (ret < 0)
7984ae52 3904 return ret;
34a28e3d
FM		 3905 ret = btrfs_wait_ordered_range(inode_out, ALIGN_DOWN(pos_out, bs),
3906 wb_len);
3907 if (ret < 0)
7984ae52 3908 return ret;
34a28e3d 3909
7984ae52 3910 return generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
34a28e3d 3911 len, remap_flags);
3db11b2e
ZB		 3912}
3913
42ec3d4c
DW		 3914loff_t btrfs_remap_file_range(struct file *src_file, loff_t off,
3915 struct file *dst_file, loff_t destoff, loff_t len,
2e5dfc99 3916 unsigned int remap_flags)
3db11b2e 3917{
34a28e3d
FM		 3918 struct inode *src_inode = file_inode(src_file);
3919 struct inode *dst_inode = file_inode(dst_file);
3920 bool same_inode = dst_inode == src_inode;
42ec3d4c
DW		 3921 int ret;
3922
2e5dfc99
DW		 3923 if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
3924 return -EINVAL;
3925
7984ae52
GR		 3926 if (same_inode)
3927 inode_lock(src_inode);
3928 else
3929 lock_two_nondirectories(src_inode, dst_inode);
3930
34a28e3d
FM		 3931 ret = btrfs_remap_file_range_prep(src_file, off, dst_file, destoff,
3932 &len, remap_flags);
3933 if (ret < 0 || len == 0)
7984ae52 3934 goto out_unlock;
2e5dfc99 3935
34a28e3d
FM		 3936 if (remap_flags & REMAP_FILE_DEDUP)
3937 ret = btrfs_extent_same(src_inode, off, len, dst_inode, destoff);
3938 else
42ec3d4c 3939 ret = btrfs_clone_files(dst_file, src_file, off, len, destoff);
34a28e3d 3940
7984ae52 3941out_unlock:
34a28e3d
FM		 3942 if (same_inode)
3943 inode_unlock(src_inode);
3944 else
4ea748e1 3945 unlock_two_nondirectories(src_inode, dst_inode);
34a28e3d 3946
42ec3d4c 3947 return ret < 0 ? ret : len;
c5c9cd4d
SW		 3948}
3949
6ef5ed0d
JB		 3950static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3951{
496ad9aa 3952 struct inode *inode = file_inode(file);
0b246afa 3953 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
6ef5ed0d
JB		 3954 struct btrfs_root *root = BTRFS_I(inode)->root;
3955 struct btrfs_root *new_root;
3956 struct btrfs_dir_item *di;
3957 struct btrfs_trans_handle *trans;
3958 struct btrfs_path *path;
3959 struct btrfs_key location;
3960 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 3961 u64 objectid = 0;
3962 u64 dir_id;
3c04ce01 3963 int ret;
6ef5ed0d
JB		 3964
3965 if (!capable(CAP_SYS_ADMIN))
3966 return -EPERM;
3967
3c04ce01
MX		 3968 ret = mnt_want_write_file(file);
3969 if (ret)
3970 return ret;
3971
3972 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3973 ret = -EFAULT;
3974 goto out;
3975 }
6ef5ed0d
JB		 3976
3977 if (!objectid)
1cecf579 3978 objectid = BTRFS_FS_TREE_OBJECTID;
6ef5ed0d
JB		 3979
3980 location.objectid = objectid;
3981 location.type = BTRFS_ROOT_ITEM_KEY;
3982 location.offset = (u64)-1;
3983
0b246afa 3984 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
3c04ce01
MX		 3985 if (IS_ERR(new_root)) {
3986 ret = PTR_ERR(new_root);
3987 goto out;
3988 }
4fd786e6 3989 if (!is_fstree(new_root->root_key.objectid)) {
6d6d2829 3990 ret = -ENOENT;
3991 goto out;
3992 }
6ef5ed0d 3993
6ef5ed0d 3994 path = btrfs_alloc_path();
3c04ce01
MX		 3995 if (!path) {
3996 ret = -ENOMEM;
3997 goto out;
3998 }
6ef5ed0d
JB		 3999 path->leave_spinning = 1;
4000
4001 trans = btrfs_start_transaction(root, 1);
98d5dc13 4002 if (IS_ERR(trans)) {
6ef5ed0d 4003 btrfs_free_path(path);
3c04ce01
MX		 4004 ret = PTR_ERR(trans);
4005 goto out;
6ef5ed0d
JB		 4006 }
4007
0b246afa
JM		 4008 dir_id = btrfs_super_root_dir(fs_info->super_copy);
4009 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
6ef5ed0d 4010 dir_id, "default", 7, 1);
cf1e99a4 4011 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d 4012 btrfs_free_path(path);
3a45bb20 4013 btrfs_end_transaction(trans);
0b246afa 4014 btrfs_err(fs_info,
5d163e0e 4015 "Umm, you don't have the default diritem, this isn't going to work");
3c04ce01
MX		 4016 ret = -ENOENT;
4017 goto out;
6ef5ed0d
JB		 4018 }
4019
4020 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4021 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4022 btrfs_mark_buffer_dirty(path->nodes[0]);
4023 btrfs_free_path(path);
4024
0b246afa 4025 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3a45bb20 4026 btrfs_end_transaction(trans);
3c04ce01
MX		 4027out:
4028 mnt_drop_write_file(file);
4029 return ret;
6ef5ed0d
JB		 4030}
4031
c065f5b1
SY		 4032static void get_block_group_info(struct list_head *groups_list,
4033 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 4034{
4035 struct btrfs_block_group_cache *block_group;
4036
4037 space->total_bytes = 0;
4038 space->used_bytes = 0;
4039 space->flags = 0;
4040 list_for_each_entry(block_group, groups_list, list) {
4041 space->flags = block_group->flags;
4042 space->total_bytes += block_group->key.offset;
4043 space->used_bytes +=
4044 btrfs_block_group_used(&block_group->item);
4045 }
4046}
4047
2ff7e61e
JM		 4048static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
4049 void __user *arg)
1406e432
JB		 4050{
4051 struct btrfs_ioctl_space_args space_args;
4052 struct btrfs_ioctl_space_info space;
4053 struct btrfs_ioctl_space_info *dest;
7fde62bf 4054 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 4055 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 4056 struct btrfs_space_info *info;
315d8e98
CIK		 4057 static const u64 types[] = {
4058 BTRFS_BLOCK_GROUP_DATA,
4059 BTRFS_BLOCK_GROUP_SYSTEM,
4060 BTRFS_BLOCK_GROUP_METADATA,
4061 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
4062 };
bf5fc093 4063 int num_types = 4;
7fde62bf 4064 int alloc_size;
1406e432 4065 int ret = 0;
51788b1b 4066 u64 slot_count = 0;
bf5fc093 4067 int i, c;
1406e432
JB		 4068
4069 if (copy_from_user(&space_args,
4070 (struct btrfs_ioctl_space_args __user *)arg,
4071 sizeof(space_args)))
4072 return -EFAULT;
4073
bf5fc093
JB		 4074 for (i = 0; i < num_types; i++) {
4075 struct btrfs_space_info *tmp;
4076
4077 info = NULL;
4078 rcu_read_lock();
0b246afa 4079 list_for_each_entry_rcu(tmp, &fs_info->space_info,
bf5fc093
JB		 4080 list) {
4081 if (tmp->flags == types[i]) {
4082 info = tmp;
4083 break;
4084 }
4085 }
4086 rcu_read_unlock();
4087
4088 if (!info)
4089 continue;
4090
4091 down_read(&info->groups_sem);
4092 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4093 if (!list_empty(&info->block_groups[c]))
4094 slot_count++;
4095 }
4096 up_read(&info->groups_sem);
4097 }
7fde62bf 4098
36523e95
DS		 4099 /*
4100 * Global block reserve, exported as a space_info
4101 */
4102 slot_count++;
4103
7fde62bf
CM		 4104 /* space_slots == 0 means they are asking for a count */
4105 if (space_args.space_slots == 0) {
4106 space_args.total_spaces = slot_count;
4107 goto out;
4108 }
bf5fc093 4109
51788b1b 4110 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 4111
7fde62bf 4112 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 4113
7fde62bf
CM		 4114 /* we generally have at most 6 or so space infos, one for each raid
4115 * level. So, a whole page should be more than enough for everyone
4116 */
09cbfeaf 4117 if (alloc_size > PAGE_SIZE)
7fde62bf
CM		 4118 return -ENOMEM;
4119
1406e432 4120 space_args.total_spaces = 0;
8d2db785 4121 dest = kmalloc(alloc_size, GFP_KERNEL);
7fde62bf
CM		 4122 if (!dest)
4123 return -ENOMEM;
4124 dest_orig = dest;
1406e432 4125
7fde62bf 4126 /* now we have a buffer to copy into */
bf5fc093
JB		 4127 for (i = 0; i < num_types; i++) {
4128 struct btrfs_space_info *tmp;
4129
51788b1b
DR		 4130 if (!slot_count)
4131 break;
4132
bf5fc093
JB		 4133 info = NULL;
4134 rcu_read_lock();
0b246afa 4135 list_for_each_entry_rcu(tmp, &fs_info->space_info,
bf5fc093
JB		 4136 list) {
4137 if (tmp->flags == types[i]) {
4138 info = tmp;
4139 break;
4140 }
4141 }
4142 rcu_read_unlock();
7fde62bf 4143
bf5fc093
JB		 4144 if (!info)
4145 continue;
4146 down_read(&info->groups_sem);
4147 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4148 if (!list_empty(&info->block_groups[c])) {
c065f5b1
SY		 4149 get_block_group_info(&info->block_groups[c],
4150 &space);
bf5fc093
JB		 4151 memcpy(dest, &space, sizeof(space));
4152 dest++;
4153 space_args.total_spaces++;
51788b1b 4154 slot_count--;
bf5fc093 4155 }
51788b1b
DR		 4156 if (!slot_count)
4157 break;
bf5fc093
JB		 4158 }
4159 up_read(&info->groups_sem);
1406e432 4160 }
1406e432 4161
36523e95
DS		 4162 /*
4163 * Add global block reserve
4164 */
4165 if (slot_count) {
0b246afa 4166 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
36523e95
DS		 4167
4168 spin_lock(&block_rsv->lock);
4169 space.total_bytes = block_rsv->size;
4170 space.used_bytes = block_rsv->size - block_rsv->reserved;
4171 spin_unlock(&block_rsv->lock);
4172 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4173 memcpy(dest, &space, sizeof(space));
4174 space_args.total_spaces++;
4175 }
4176
2eec6c81 4177 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 4178 (arg + sizeof(struct btrfs_ioctl_space_args));
4179
4180 if (copy_to_user(user_dest, dest_orig, alloc_size))
4181 ret = -EFAULT;
4182
4183 kfree(dest_orig);
4184out:
4185 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 4186 ret = -EFAULT;
4187
4188 return ret;
4189}
4190
9a8c28be
MX		 4191static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4192 void __user *argp)
46204592 4193{
46204592
SW		 4194 struct btrfs_trans_handle *trans;
4195 u64 transid;
db5b493a 4196 int ret;
46204592 4197
d4edf39b 4198 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 4199 if (IS_ERR(trans)) {
4200 if (PTR_ERR(trans) != -ENOENT)
4201 return PTR_ERR(trans);
4202
4203 /* No running transaction, don't bother */
4204 transid = root->fs_info->last_trans_committed;
4205 goto out;
4206 }
46204592 4207 transid = trans->transid;
3a45bb20 4208 ret = btrfs_commit_transaction_async(trans, 0);
8b2b2d3c 4209 if (ret) {
3a45bb20 4210 btrfs_end_transaction(trans);
db5b493a 4211 return ret;
8b2b2d3c 4212 }
ff7c1d33 4213out:
46204592
SW		 4214 if (argp)
4215 if (copy_to_user(argp, &transid, sizeof(transid)))
4216 return -EFAULT;
4217 return 0;
4218}
4219
2ff7e61e 4220static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
9a8c28be 4221 void __user *argp)
46204592 4222{
46204592
SW		 4223 u64 transid;
4224
4225 if (argp) {
4226 if (copy_from_user(&transid, argp, sizeof(transid)))
4227 return -EFAULT;
4228 } else {
4229 transid = 0; /* current trans */
4230 }
2ff7e61e 4231 return btrfs_wait_for_commit(fs_info, transid);
46204592
SW		 4232}
4233
b8e95489 4234static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 4235{
0b246afa 4236 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
475f6387 4237 struct btrfs_ioctl_scrub_args *sa;
b8e95489 4238 int ret;
475f6387
JS		 4239
4240 if (!capable(CAP_SYS_ADMIN))
4241 return -EPERM;
4242
4243 sa = memdup_user(arg, sizeof(*sa));
4244 if (IS_ERR(sa))
4245 return PTR_ERR(sa);
4246
b8e95489
MX		 4247 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4248 ret = mnt_want_write_file(file);
4249 if (ret)
4250 goto out;
4251 }
4252
0b246afa 4253 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 4254 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4255 0);
475f6387 4256
06fe39ab 4257 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
475f6387
JS		 4258 ret = -EFAULT;
4259
b8e95489
MX		 4260 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4261 mnt_drop_write_file(file);
4262out:
475f6387
JS		 4263 kfree(sa);
4264 return ret;
4265}
4266
2ff7e61e 4267static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
475f6387
JS		 4268{
4269 if (!capable(CAP_SYS_ADMIN))
4270 return -EPERM;
4271
2ff7e61e 4272 return btrfs_scrub_cancel(fs_info);
475f6387
JS		 4273}
4274
2ff7e61e 4275static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
475f6387
JS		 4276 void __user *arg)
4277{
4278 struct btrfs_ioctl_scrub_args *sa;
4279 int ret;
4280
4281 if (!capable(CAP_SYS_ADMIN))
4282 return -EPERM;
4283
4284 sa = memdup_user(arg, sizeof(*sa));
4285 if (IS_ERR(sa))
4286 return PTR_ERR(sa);
4287
2ff7e61e 4288 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
475f6387 4289
4fa99b00 4290 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
475f6387
JS		 4291 ret = -EFAULT;
4292
4293 kfree(sa);
4294 return ret;
4295}
4296
2ff7e61e 4297static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
b27f7c0c 4298 void __user *arg)
c11d2c23
SB		 4299{
4300 struct btrfs_ioctl_get_dev_stats *sa;
4301 int ret;
4302
c11d2c23
SB		 4303 sa = memdup_user(arg, sizeof(*sa));
4304 if (IS_ERR(sa))
4305 return PTR_ERR(sa);
4306
b27f7c0c
DS		 4307 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4308 kfree(sa);
4309 return -EPERM;
4310 }
4311
2ff7e61e 4312 ret = btrfs_get_dev_stats(fs_info, sa);
c11d2c23 4313
eee99577 4314 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
c11d2c23
SB		 4315 ret = -EFAULT;
4316
4317 kfree(sa);
4318 return ret;
4319}
4320
2ff7e61e
JM		 4321static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
4322 void __user *arg)
3f6bcfbd
SB		 4323{
4324 struct btrfs_ioctl_dev_replace_args *p;
4325 int ret;
4326
4327 if (!capable(CAP_SYS_ADMIN))
4328 return -EPERM;
4329
4330 p = memdup_user(arg, sizeof(*p));
4331 if (IS_ERR(p))
4332 return PTR_ERR(p);
4333
4334 switch (p->cmd) {
4335 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
bc98a42c 4336 if (sb_rdonly(fs_info->sb)) {
adfa97cb
ID		 4337 ret = -EROFS;
4338 goto out;
4339 }
171938e5 4340 if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
e57138b3 4341 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd 4342 } else {
2ff7e61e 4343 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
171938e5 4344 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
3f6bcfbd
SB		 4345 }
4346 break;
4347 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
0b246afa 4348 btrfs_dev_replace_status(fs_info, p);
3f6bcfbd
SB		 4349 ret = 0;
4350 break;
4351 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
17d202b9 4352 p->result = btrfs_dev_replace_cancel(fs_info);
97282031 4353 ret = 0;
3f6bcfbd
SB		 4354 break;
4355 default:
4356 ret = -EINVAL;
4357 break;
4358 }
4359
d3a53286 4360 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3f6bcfbd 4361 ret = -EFAULT;
adfa97cb 4362out:
3f6bcfbd
SB		 4363 kfree(p);
4364 return ret;
4365}
4366
d7728c96
JS		 4367static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4368{
4369 int ret = 0;
4370 int i;
740c3d22 4371 u64 rel_ptr;
d7728c96 4372 int size;
806468f8 4373 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 4374 struct inode_fs_paths *ipath = NULL;
4375 struct btrfs_path *path;
4376
82b22ac8 4377 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 4378 return -EPERM;
4379
4380 path = btrfs_alloc_path();
4381 if (!path) {
4382 ret = -ENOMEM;
4383 goto out;
4384 }
4385
4386 ipa = memdup_user(arg, sizeof(*ipa));
4387 if (IS_ERR(ipa)) {
4388 ret = PTR_ERR(ipa);
4389 ipa = NULL;
4390 goto out;
4391 }
4392
4393 size = min_t(u32, ipa->size, 4096);
4394 ipath = init_ipath(size, root, path);
4395 if (IS_ERR(ipath)) {
4396 ret = PTR_ERR(ipath);
4397 ipath = NULL;
4398 goto out;
4399 }
4400
4401 ret = paths_from_inode(ipa->inum, ipath);
4402 if (ret < 0)
4403 goto out;
4404
4405 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 4406 rel_ptr = ipath->fspath->val[i] -
4407 (u64)(unsigned long)ipath->fspath->val;
740c3d22 4408 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 4409 }
4410
718dc5fa
OS		 4411 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
4412 ipath->fspath, size);
d7728c96
JS		 4413 if (ret) {
4414 ret = -EFAULT;
4415 goto out;
4416 }
4417
4418out:
4419 btrfs_free_path(path);
4420 free_ipath(ipath);
4421 kfree(ipa);
4422
4423 return ret;
4424}
4425
4426static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4427{
4428 struct btrfs_data_container *inodes = ctx;
4429 const size_t c = 3 * sizeof(u64);
4430
4431 if (inodes->bytes_left >= c) {
4432 inodes->bytes_left -= c;
4433 inodes->val[inodes->elem_cnt] = inum;
4434 inodes->val[inodes->elem_cnt + 1] = offset;
4435 inodes->val[inodes->elem_cnt + 2] = root;
4436 inodes->elem_cnt += 3;
4437 } else {
4438 inodes->bytes_missing += c - inodes->bytes_left;
4439 inodes->bytes_left = 0;
4440 inodes->elem_missed += 3;
4441 }
4442
4443 return 0;
4444}
4445
2ff7e61e 4446static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
d24a67b2 4447 void __user *arg, int version)
d7728c96
JS		 4448{
4449 int ret = 0;
4450 int size;
d7728c96
JS		 4451 struct btrfs_ioctl_logical_ino_args *loi;
4452 struct btrfs_data_container *inodes = NULL;
4453 struct btrfs_path *path = NULL;
d24a67b2 4454 bool ignore_offset;
d7728c96
JS		 4455
4456 if (!capable(CAP_SYS_ADMIN))
4457 return -EPERM;
4458
4459 loi = memdup_user(arg, sizeof(*loi));
7b9ea627
SV		 4460 if (IS_ERR(loi))
4461 return PTR_ERR(loi);
d7728c96 4462
d24a67b2
ZB		 4463 if (version == 1) {
4464 ignore_offset = false;
b115e3bc 4465 size = min_t(u32, loi->size, SZ_64K);
d24a67b2
ZB		 4466 } else {
4467 /* All reserved bits must be 0 for now */
4468 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
4469 ret = -EINVAL;
4470 goto out_loi;
4471 }
4472 /* Only accept flags we have defined so far */
4473 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
4474 ret = -EINVAL;
4475 goto out_loi;
4476 }
4477 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
b115e3bc 4478 size = min_t(u32, loi->size, SZ_16M);
d24a67b2
ZB		 4479 }
4480
d7728c96
JS		 4481 path = btrfs_alloc_path();
4482 if (!path) {
4483 ret = -ENOMEM;
4484 goto out;
4485 }
4486
d7728c96
JS		 4487 inodes = init_data_container(size);
4488 if (IS_ERR(inodes)) {
4489 ret = PTR_ERR(inodes);
4490 inodes = NULL;
4491 goto out;
4492 }
4493
2ff7e61e 4494 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
d24a67b2 4495 build_ino_list, inodes, ignore_offset);
df031f07 4496 if (ret == -EINVAL)
d7728c96
JS		 4497 ret = -ENOENT;
4498 if (ret < 0)
4499 goto out;
4500
718dc5fa
OS		 4501 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
4502 size);
d7728c96
JS		 4503 if (ret)
4504 ret = -EFAULT;
4505
4506out:
4507 btrfs_free_path(path);
f54de068 4508 kvfree(inodes);
d24a67b2 4509out_loi:
d7728c96
JS		 4510 kfree(loi);
4511
4512 return ret;
4513}
4514
008ef096 4515void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
c9e9f97b
ID		 4516 struct btrfs_ioctl_balance_args *bargs)
4517{
4518 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4519
4520 bargs->flags = bctl->flags;
4521
3009a62f 4522 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
837d5b6e
ID		 4523 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4524 if (atomic_read(&fs_info->balance_pause_req))
4525 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 4526 if (atomic_read(&fs_info->balance_cancel_req))
4527 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 4528
c9e9f97b
ID		 4529 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4530 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4531 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce 4532
008ef096
DS		 4533 spin_lock(&fs_info->balance_lock);
4534 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4535 spin_unlock(&fs_info->balance_lock);
c9e9f97b
ID		 4536}
4537
9ba1f6e4 4538static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 4539{
496ad9aa 4540 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 4541 struct btrfs_fs_info *fs_info = root->fs_info;
4542 struct btrfs_ioctl_balance_args *bargs;
4543 struct btrfs_balance_control *bctl;
ed0fb78f 4544 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 4545 int ret;
4546
4547 if (!capable(CAP_SYS_ADMIN))
4548 return -EPERM;
4549
e54bfa31 4550 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 4551 if (ret)
4552 return ret;
4553
ed0fb78f 4554again:
171938e5 4555 if (!test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
ed0fb78f
ID		 4556 mutex_lock(&fs_info->balance_mutex);
4557 need_unlock = true;
4558 goto locked;
4559 }
4560
4561 /*
01327610 4562 * mut. excl. ops lock is locked. Three possibilities:
ed0fb78f
ID		 4563 * (1) some other op is running
4564 * (2) balance is running
4565 * (3) balance is paused -- special case (think resume)
4566 */
c9e9f97b 4567 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 4568 if (fs_info->balance_ctl) {
4569 /* this is either (2) or (3) */
3009a62f 4570 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
ed0fb78f 4571 mutex_unlock(&fs_info->balance_mutex);
dccdb07b
DS		 4572 /*
4573 * Lock released to allow other waiters to continue,
4574 * we'll reexamine the status again.
4575 */
ed0fb78f
ID		 4576 mutex_lock(&fs_info->balance_mutex);
4577
4578 if (fs_info->balance_ctl &&
3009a62f 4579 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
ed0fb78f
ID		 4580 /* this is (3) */
4581 need_unlock = false;
4582 goto locked;
4583 }
4584
4585 mutex_unlock(&fs_info->balance_mutex);
ed0fb78f
ID		 4586 goto again;
4587 } else {
4588 /* this is (2) */
4589 mutex_unlock(&fs_info->balance_mutex);
4590 ret = -EINPROGRESS;
4591 goto out;
4592 }
4593 } else {
4594 /* this is (1) */
4595 mutex_unlock(&fs_info->balance_mutex);
e57138b3 4596 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 4597 goto out;
4598 }
4599
4600locked:
171938e5 4601 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP, &fs_info->flags));
c9e9f97b
ID		 4602
4603 if (arg) {
4604 bargs = memdup_user(arg, sizeof(*bargs));
4605 if (IS_ERR(bargs)) {
4606 ret = PTR_ERR(bargs);
ed0fb78f 4607 goto out_unlock;
c9e9f97b 4608 }
de322263
ID		 4609
4610 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4611 if (!fs_info->balance_ctl) {
4612 ret = -ENOTCONN;
4613 goto out_bargs;
4614 }
4615
4616 bctl = fs_info->balance_ctl;
4617 spin_lock(&fs_info->balance_lock);
4618 bctl->flags |= BTRFS_BALANCE_RESUME;
4619 spin_unlock(&fs_info->balance_lock);
4620
4621 goto do_balance;
4622 }
c9e9f97b
ID		 4623 } else {
4624 bargs = NULL;
4625 }
4626
ed0fb78f 4627 if (fs_info->balance_ctl) {
837d5b6e
ID		 4628 ret = -EINPROGRESS;
4629 goto out_bargs;
4630 }
4631
8d2db785 4632 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
c9e9f97b
ID		 4633 if (!bctl) {
4634 ret = -ENOMEM;
4635 goto out_bargs;
4636 }
4637
c9e9f97b
ID		 4638 if (arg) {
4639 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4640 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4641 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4642
4643 bctl->flags = bargs->flags;
f43ffb60
ID		 4644 } else {
4645 /* balance everything - no filters */
4646 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 4647 }
4648
8eb93459
DS		 4649 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4650 ret = -EINVAL;
0f89abf5 4651 goto out_bctl;
8eb93459
DS		 4652 }
4653
de322263 4654do_balance:
c9e9f97b 4655 /*
149196a2
DS		 4656 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
4657 * btrfs_balance. bctl is freed in reset_balance_state, or, if
4658 * restriper was paused all the way until unmount, in free_fs_info.
4659 * The flag should be cleared after reset_balance_state.
c9e9f97b 4660 */
ed0fb78f
ID		 4661 need_unlock = false;
4662
6fcf6e2b 4663 ret = btrfs_balance(fs_info, bctl, bargs);
0f89abf5 4664 bctl = NULL;
ed0fb78f 4665
d00c2d9c 4666 if ((ret == 0 || ret == -ECANCELED) && arg) {
c9e9f97b
ID		 4667 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4668 ret = -EFAULT;
4669 }
4670
0f89abf5
CE		 4671out_bctl:
4672 kfree(bctl);
c9e9f97b
ID		 4673out_bargs:
4674 kfree(bargs);
ed0fb78f 4675out_unlock:
c9e9f97b 4676 mutex_unlock(&fs_info->balance_mutex);
ed0fb78f 4677 if (need_unlock)
171938e5 4678 clear_bit(BTRFS_FS_EXCL_OP, &fs_info->flags);
ed0fb78f 4679out:
e54bfa31 4680 mnt_drop_write_file(file);
c9e9f97b
ID		 4681 return ret;
4682}
4683
2ff7e61e 4684static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
837d5b6e
ID		 4685{
4686 if (!capable(CAP_SYS_ADMIN))
4687 return -EPERM;
4688
4689 switch (cmd) {
4690 case BTRFS_BALANCE_CTL_PAUSE:
0b246afa 4691 return btrfs_pause_balance(fs_info);
a7e99c69 4692 case BTRFS_BALANCE_CTL_CANCEL:
0b246afa 4693 return btrfs_cancel_balance(fs_info);
837d5b6e
ID		 4694 }
4695
4696 return -EINVAL;
4697}
4698
2ff7e61e 4699static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
19a39dce
ID		 4700 void __user *arg)
4701{
19a39dce
ID		 4702 struct btrfs_ioctl_balance_args *bargs;
4703 int ret = 0;
4704
4705 if (!capable(CAP_SYS_ADMIN))
4706 return -EPERM;
4707
4708 mutex_lock(&fs_info->balance_mutex);
4709 if (!fs_info->balance_ctl) {
4710 ret = -ENOTCONN;
4711 goto out;
4712 }
4713
8d2db785 4714 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
19a39dce
ID		 4715 if (!bargs) {
4716 ret = -ENOMEM;
4717 goto out;
4718 }
4719
008ef096 4720 btrfs_update_ioctl_balance_args(fs_info, bargs);
19a39dce
ID		 4721
4722 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4723 ret = -EFAULT;
4724
4725 kfree(bargs);
4726out:
4727 mutex_unlock(&fs_info->balance_mutex);
4728 return ret;
4729}
4730
905b0dda 4731static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4732{
0b246afa
JM		 4733 struct inode *inode = file_inode(file);
4734 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5d13a37b 4735 struct btrfs_ioctl_quota_ctl_args *sa;
5d13a37b 4736 int ret;
5d13a37b
AJ		 4737
4738 if (!capable(CAP_SYS_ADMIN))
4739 return -EPERM;
4740
905b0dda
MX		 4741 ret = mnt_want_write_file(file);
4742 if (ret)
4743 return ret;
5d13a37b
AJ		 4744
4745 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4746 if (IS_ERR(sa)) {
4747 ret = PTR_ERR(sa);
4748 goto drop_write;
4749 }
5d13a37b 4750
0b246afa 4751 down_write(&fs_info->subvol_sem);
5d13a37b
AJ		 4752
4753 switch (sa->cmd) {
4754 case BTRFS_QUOTA_CTL_ENABLE:
340f1aa2 4755 ret = btrfs_quota_enable(fs_info);
5d13a37b
AJ		 4756 break;
4757 case BTRFS_QUOTA_CTL_DISABLE:
340f1aa2 4758 ret = btrfs_quota_disable(fs_info);
5d13a37b 4759 break;
5d13a37b
AJ		 4760 default:
4761 ret = -EINVAL;
4762 break;
4763 }
4764
5d13a37b 4765 kfree(sa);
0b246afa 4766 up_write(&fs_info->subvol_sem);
905b0dda
MX		 4767drop_write:
4768 mnt_drop_write_file(file);
5d13a37b
AJ		 4769 return ret;
4770}
4771
905b0dda 4772static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4773{
0b246afa
JM		 4774 struct inode *inode = file_inode(file);
4775 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4776 struct btrfs_root *root = BTRFS_I(inode)->root;
5d13a37b
AJ		 4777 struct btrfs_ioctl_qgroup_assign_args *sa;
4778 struct btrfs_trans_handle *trans;
4779 int ret;
4780 int err;
4781
4782 if (!capable(CAP_SYS_ADMIN))
4783 return -EPERM;
4784
905b0dda
MX		 4785 ret = mnt_want_write_file(file);
4786 if (ret)
4787 return ret;
5d13a37b
AJ		 4788
4789 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4790 if (IS_ERR(sa)) {
4791 ret = PTR_ERR(sa);
4792 goto drop_write;
4793 }
5d13a37b
AJ		 4794
4795 trans = btrfs_join_transaction(root);
4796 if (IS_ERR(trans)) {
4797 ret = PTR_ERR(trans);
4798 goto out;
4799 }
4800
5d13a37b 4801 if (sa->assign) {
9f8a6ce6 4802 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
5d13a37b 4803 } else {
39616c27 4804 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
5d13a37b
AJ		 4805 }
4806
e082f563 4807 /* update qgroup status and info */
280f8bd2 4808 err = btrfs_run_qgroups(trans);
e082f563 4809 if (err < 0)
0b246afa
JM		 4810 btrfs_handle_fs_error(fs_info, err,
4811 "failed to update qgroup status and info");
3a45bb20 4812 err = btrfs_end_transaction(trans);
5d13a37b
AJ		 4813 if (err && !ret)
4814 ret = err;
4815
4816out:
4817 kfree(sa);
905b0dda
MX		 4818drop_write:
4819 mnt_drop_write_file(file);
5d13a37b
AJ		 4820 return ret;
4821}
4822
905b0dda 4823static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4824{
0b246afa 4825 struct inode *inode = file_inode(file);
0b246afa 4826 struct btrfs_root *root = BTRFS_I(inode)->root;
5d13a37b
AJ		 4827 struct btrfs_ioctl_qgroup_create_args *sa;
4828 struct btrfs_trans_handle *trans;
4829 int ret;
4830 int err;
4831
4832 if (!capable(CAP_SYS_ADMIN))
4833 return -EPERM;
4834
905b0dda
MX		 4835 ret = mnt_want_write_file(file);
4836 if (ret)
4837 return ret;
5d13a37b
AJ		 4838
4839 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4840 if (IS_ERR(sa)) {
4841 ret = PTR_ERR(sa);
4842 goto drop_write;
4843 }
5d13a37b 4844
d86e56cf
MX		 4845 if (!sa->qgroupid) {
4846 ret = -EINVAL;
4847 goto out;
4848 }
4849
5d13a37b
AJ		 4850 trans = btrfs_join_transaction(root);
4851 if (IS_ERR(trans)) {
4852 ret = PTR_ERR(trans);
4853 goto out;
4854 }
4855
5d13a37b 4856 if (sa->create) {
49a05ecd 4857 ret = btrfs_create_qgroup(trans, sa->qgroupid);
5d13a37b 4858 } else {
3efbee1d 4859 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
5d13a37b
AJ		 4860 }
4861
3a45bb20 4862 err = btrfs_end_transaction(trans);
5d13a37b
AJ		 4863 if (err && !ret)
4864 ret = err;
4865
4866out:
4867 kfree(sa);
905b0dda
MX		 4868drop_write:
4869 mnt_drop_write_file(file);
5d13a37b
AJ		 4870 return ret;
4871}
4872
905b0dda 4873static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4874{
0b246afa 4875 struct inode *inode = file_inode(file);
0b246afa 4876 struct btrfs_root *root = BTRFS_I(inode)->root;
5d13a37b
AJ		 4877 struct btrfs_ioctl_qgroup_limit_args *sa;
4878 struct btrfs_trans_handle *trans;
4879 int ret;
4880 int err;
4881 u64 qgroupid;
4882
4883 if (!capable(CAP_SYS_ADMIN))
4884 return -EPERM;
4885
905b0dda
MX		 4886 ret = mnt_want_write_file(file);
4887 if (ret)
4888 return ret;
5d13a37b
AJ		 4889
4890 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4891 if (IS_ERR(sa)) {
4892 ret = PTR_ERR(sa);
4893 goto drop_write;
4894 }
5d13a37b
AJ		 4895
4896 trans = btrfs_join_transaction(root);
4897 if (IS_ERR(trans)) {
4898 ret = PTR_ERR(trans);
4899 goto out;
4900 }
4901
4902 qgroupid = sa->qgroupid;
4903 if (!qgroupid) {
4904 /* take the current subvol as qgroup */
4905 qgroupid = root->root_key.objectid;
4906 }
4907
f0042d5e 4908 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
5d13a37b 4909
3a45bb20 4910 err = btrfs_end_transaction(trans);
5d13a37b
AJ		 4911 if (err && !ret)
4912 ret = err;
4913
4914out:
4915 kfree(sa);
905b0dda
MX		 4916drop_write:
4917 mnt_drop_write_file(file);
5d13a37b
AJ		 4918 return ret;
4919}
4920
2f232036
JS		 4921static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4922{
0b246afa
JM		 4923 struct inode *inode = file_inode(file);
4924 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2f232036
JS		 4925 struct btrfs_ioctl_quota_rescan_args *qsa;
4926 int ret;
4927
4928 if (!capable(CAP_SYS_ADMIN))
4929 return -EPERM;
4930
4931 ret = mnt_want_write_file(file);
4932 if (ret)
4933 return ret;
4934
4935 qsa = memdup_user(arg, sizeof(*qsa));
4936 if (IS_ERR(qsa)) {
4937 ret = PTR_ERR(qsa);
4938 goto drop_write;
4939 }
4940
4941 if (qsa->flags) {
4942 ret = -EINVAL;
4943 goto out;
4944 }
4945
0b246afa 4946 ret = btrfs_qgroup_rescan(fs_info);
2f232036
JS		 4947
4948out:
4949 kfree(qsa);
4950drop_write:
4951 mnt_drop_write_file(file);
4952 return ret;
4953}
4954
4955static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4956{
0b246afa
JM		 4957 struct inode *inode = file_inode(file);
4958 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
2f232036
JS		 4959 struct btrfs_ioctl_quota_rescan_args *qsa;
4960 int ret = 0;
4961
4962 if (!capable(CAP_SYS_ADMIN))
4963 return -EPERM;
4964
8d2db785 4965 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
2f232036
JS		 4966 if (!qsa)
4967 return -ENOMEM;
4968
0b246afa 4969 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
2f232036 4970 qsa->flags = 1;
0b246afa 4971 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
2f232036
JS		 4972 }
4973
4974 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4975 ret = -EFAULT;
4976
4977 kfree(qsa);
4978 return ret;
4979}
4980
57254b6e
JS		 4981static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4982{
0b246afa
JM		 4983 struct inode *inode = file_inode(file);
4984 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
57254b6e
JS		 4985
4986 if (!capable(CAP_SYS_ADMIN))
4987 return -EPERM;
4988
0b246afa 4989 return btrfs_qgroup_wait_for_completion(fs_info, true);
57254b6e
JS		 4990}
4991
abccd00f
HM		 4992static long _btrfs_ioctl_set_received_subvol(struct file *file,
4993 struct btrfs_ioctl_received_subvol_args *sa)
8ea05e3a 4994{
496ad9aa 4995 struct inode *inode = file_inode(file);
0b246afa 4996 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
8ea05e3a
AB		 4997 struct btrfs_root *root = BTRFS_I(inode)->root;
4998 struct btrfs_root_item *root_item = &root->root_item;
4999 struct btrfs_trans_handle *trans;
95582b00 5000 struct timespec64 ct = current_time(inode);
8ea05e3a 5001 int ret = 0;
dd5f9615 5002 int received_uuid_changed;
8ea05e3a 5003
bd60ea0f
DS		 5004 if (!inode_owner_or_capable(inode))
5005 return -EPERM;
5006
8ea05e3a
AB		 5007 ret = mnt_want_write_file(file);
5008 if (ret < 0)
5009 return ret;
5010
0b246afa 5011 down_write(&fs_info->subvol_sem);
8ea05e3a 5012
4a0cc7ca 5013 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
8ea05e3a
AB		 5014 ret = -EINVAL;
5015 goto out;
5016 }
5017
5018 if (btrfs_root_readonly(root)) {
5019 ret = -EROFS;
5020 goto out;
5021 }
5022
dd5f9615
SB		 5023 /*
5024 * 1 - root item
5025 * 2 - uuid items (received uuid + subvol uuid)
5026 */
5027 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 5028 if (IS_ERR(trans)) {
5029 ret = PTR_ERR(trans);
5030 trans = NULL;
5031 goto out;
5032 }
5033
5034 sa->rtransid = trans->transid;
5035 sa->rtime.sec = ct.tv_sec;
5036 sa->rtime.nsec = ct.tv_nsec;
5037
dd5f9615
SB		 5038 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5039 BTRFS_UUID_SIZE);
5040 if (received_uuid_changed &&
d87ff758 5041 !btrfs_is_empty_uuid(root_item->received_uuid)) {
d1957791 5042 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
d87ff758
NB		 5043 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5044 root->root_key.objectid);
5045 if (ret && ret != -ENOENT) {
5046 btrfs_abort_transaction(trans, ret);
5047 btrfs_end_transaction(trans);
5048 goto out;
5049 }
5050 }
8ea05e3a
AB		 5051 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5052 btrfs_set_root_stransid(root_item, sa->stransid);
5053 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 5054 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5055 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5056 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5057 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a 5058
0b246afa 5059 ret = btrfs_update_root(trans, fs_info->tree_root,
8ea05e3a
AB		 5060 &root->root_key, &root->root_item);
5061 if (ret < 0) {
3a45bb20 5062 btrfs_end_transaction(trans);
8ea05e3a 5063 goto out;
dd5f9615
SB		 5064 }
5065 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
cdb345a8 5066 ret = btrfs_uuid_tree_add(trans, sa->uuid,
dd5f9615
SB		 5067 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5068 root->root_key.objectid);
5069 if (ret < 0 && ret != -EEXIST) {
66642832 5070 btrfs_abort_transaction(trans, ret);
efd38150 5071 btrfs_end_transaction(trans);
8ea05e3a 5072 goto out;
dd5f9615
SB		 5073 }
5074 }
3a45bb20 5075 ret = btrfs_commit_transaction(trans);
abccd00f 5076out:
0b246afa 5077 up_write(&fs_info->subvol_sem);
abccd00f
HM		 5078 mnt_drop_write_file(file);
5079 return ret;
5080}
5081
5082#ifdef CONFIG_64BIT
5083static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5084 void __user *arg)
5085{
5086 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5087 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5088 int ret = 0;
5089
5090 args32 = memdup_user(arg, sizeof(*args32));
7b9ea627
SV		 5091 if (IS_ERR(args32))
5092 return PTR_ERR(args32);
abccd00f 5093
8d2db785 5094 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
84dbeb87
DC		 5095 if (!args64) {
5096 ret = -ENOMEM;
abccd00f
HM		 5097 goto out;
5098 }
5099
5100 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5101 args64->stransid = args32->stransid;
5102 args64->rtransid = args32->rtransid;
5103 args64->stime.sec = args32->stime.sec;
5104 args64->stime.nsec = args32->stime.nsec;
5105 args64->rtime.sec = args32->rtime.sec;
5106 args64->rtime.nsec = args32->rtime.nsec;
5107 args64->flags = args32->flags;
5108
5109 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5110 if (ret)
5111 goto out;
5112
5113 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5114 args32->stransid = args64->stransid;
5115 args32->rtransid = args64->rtransid;
5116 args32->stime.sec = args64->stime.sec;
5117 args32->stime.nsec = args64->stime.nsec;
5118 args32->rtime.sec = args64->rtime.sec;
5119 args32->rtime.nsec = args64->rtime.nsec;
5120 args32->flags = args64->flags;
5121
5122 ret = copy_to_user(arg, args32, sizeof(*args32));
5123 if (ret)
5124 ret = -EFAULT;
5125
5126out:
5127 kfree(args32);
5128 kfree(args64);
5129 return ret;
5130}
5131#endif
5132
5133static long btrfs_ioctl_set_received_subvol(struct file *file,
5134 void __user *arg)
5135{
5136 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5137 int ret = 0;
5138
5139 sa = memdup_user(arg, sizeof(*sa));
7b9ea627
SV		 5140 if (IS_ERR(sa))
5141 return PTR_ERR(sa);
abccd00f
HM		 5142
5143 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5144
5145 if (ret)
5146 goto out;
5147
8ea05e3a
AB		 5148 ret = copy_to_user(arg, sa, sizeof(*sa));
5149 if (ret)
5150 ret = -EFAULT;
5151
5152out:
5153 kfree(sa);
8ea05e3a
AB		 5154 return ret;
5155}
5156
867ab667 5157static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5158{
0b246afa
JM		 5159 struct inode *inode = file_inode(file);
5160 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
a1b83ac5 5161 size_t len;
867ab667 5162 int ret;
a1b83ac5
AJ		 5163 char label[BTRFS_LABEL_SIZE];
5164
0b246afa
JM		 5165 spin_lock(&fs_info->super_lock);
5166 memcpy(label, fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5167 spin_unlock(&fs_info->super_lock);
a1b83ac5
AJ		 5168
5169 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 5170
5171 if (len == BTRFS_LABEL_SIZE) {
0b246afa
JM		 5172 btrfs_warn(fs_info,
5173 "label is too long, return the first %zu bytes",
5174 --len);
867ab667 5175 }
5176
867ab667 5177 ret = copy_to_user(arg, label, len);
867ab667 5178
5179 return ret ? -EFAULT : 0;
5180}
5181
a8bfd4ab 5182static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5183{
0b246afa
JM		 5184 struct inode *inode = file_inode(file);
5185 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5186 struct btrfs_root *root = BTRFS_I(inode)->root;
5187 struct btrfs_super_block *super_block = fs_info->super_copy;
a8bfd4ab 5188 struct btrfs_trans_handle *trans;
5189 char label[BTRFS_LABEL_SIZE];
5190 int ret;
5191
5192 if (!capable(CAP_SYS_ADMIN))
5193 return -EPERM;
5194
5195 if (copy_from_user(label, arg, sizeof(label)))
5196 return -EFAULT;
5197
5198 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
0b246afa 5199 btrfs_err(fs_info,
5d163e0e
JM		 5200 "unable to set label with more than %d bytes",
5201 BTRFS_LABEL_SIZE - 1);
a8bfd4ab 5202 return -EINVAL;
5203 }
5204
5205 ret = mnt_want_write_file(file);
5206 if (ret)
5207 return ret;
5208
a8bfd4ab 5209 trans = btrfs_start_transaction(root, 0);
5210 if (IS_ERR(trans)) {
5211 ret = PTR_ERR(trans);
5212 goto out_unlock;
5213 }
5214
0b246afa 5215 spin_lock(&fs_info->super_lock);
a8bfd4ab 5216 strcpy(super_block->label, label);
0b246afa 5217 spin_unlock(&fs_info->super_lock);
3a45bb20 5218 ret = btrfs_commit_transaction(trans);
a8bfd4ab 5219
5220out_unlock:
a8bfd4ab 5221 mnt_drop_write_file(file);
5222 return ret;
5223}
5224
2eaa055f
JM		 5225#define INIT_FEATURE_FLAGS(suffix) \
5226 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5227 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5228 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5229
d5131b65 5230int btrfs_ioctl_get_supported_features(void __user *arg)
2eaa055f 5231{
4d4ab6d6 5232 static const struct btrfs_ioctl_feature_flags features[3] = {
2eaa055f
JM		 5233 INIT_FEATURE_FLAGS(SUPP),
5234 INIT_FEATURE_FLAGS(SAFE_SET),
5235 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5236 };
5237
5238 if (copy_to_user(arg, &features, sizeof(features)))
5239 return -EFAULT;
5240
5241 return 0;
5242}
5243
5244static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5245{
0b246afa
JM		 5246 struct inode *inode = file_inode(file);
5247 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5248 struct btrfs_super_block *super_block = fs_info->super_copy;
2eaa055f
JM		 5249 struct btrfs_ioctl_feature_flags features;
5250
5251 features.compat_flags = btrfs_super_compat_flags(super_block);
5252 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5253 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5254
5255 if (copy_to_user(arg, &features, sizeof(features)))
5256 return -EFAULT;
5257
5258 return 0;
5259}
5260
2ff7e61e 5261static int check_feature_bits(struct btrfs_fs_info *fs_info,
3b02a68a 5262 enum btrfs_feature_set set,
2eaa055f
JM		 5263 u64 change_mask, u64 flags, u64 supported_flags,
5264 u64 safe_set, u64 safe_clear)
5265{
f10152bc 5266 const char *type = btrfs_feature_set_name(set);
3b02a68a 5267 char *names;
2eaa055f
JM		 5268 u64 disallowed, unsupported;
5269 u64 set_mask = flags & change_mask;
5270 u64 clear_mask = ~flags & change_mask;
5271
5272 unsupported = set_mask & ~supported_flags;
5273 if (unsupported) {
3b02a68a
JM		 5274 names = btrfs_printable_features(set, unsupported);
5275 if (names) {
0b246afa
JM		 5276 btrfs_warn(fs_info,
5277 "this kernel does not support the %s feature bit%s",
5278 names, strchr(names, ',') ? "s" : "");
3b02a68a
JM		 5279 kfree(names);
5280 } else
0b246afa
JM		 5281 btrfs_warn(fs_info,
5282 "this kernel does not support %s bits 0x%llx",
5283 type, unsupported);
2eaa055f
JM		 5284 return -EOPNOTSUPP;
5285 }
5286
5287 disallowed = set_mask & ~safe_set;
5288 if (disallowed) {
3b02a68a
JM		 5289 names = btrfs_printable_features(set, disallowed);
5290 if (names) {
0b246afa
JM		 5291 btrfs_warn(fs_info,
5292 "can't set the %s feature bit%s while mounted",
5293 names, strchr(names, ',') ? "s" : "");
3b02a68a
JM		 5294 kfree(names);
5295 } else
0b246afa
JM		 5296 btrfs_warn(fs_info,
5297 "can't set %s bits 0x%llx while mounted",
5298 type, disallowed);
2eaa055f
JM		 5299 return -EPERM;
5300 }
5301
5302 disallowed = clear_mask & ~safe_clear;
5303 if (disallowed) {
3b02a68a
JM		 5304 names = btrfs_printable_features(set, disallowed);
5305 if (names) {
0b246afa
JM		 5306 btrfs_warn(fs_info,
5307 "can't clear the %s feature bit%s while mounted",
5308 names, strchr(names, ',') ? "s" : "");
3b02a68a
JM		 5309 kfree(names);
5310 } else
0b246afa
JM		 5311 btrfs_warn(fs_info,
5312 "can't clear %s bits 0x%llx while mounted",
5313 type, disallowed);
2eaa055f
JM		 5314 return -EPERM;
5315 }
5316
5317 return 0;
5318}
5319
2ff7e61e
JM		 5320#define check_feature(fs_info, change_mask, flags, mask_base) \
5321check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
2eaa055f
JM		 5322 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5323 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5324 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5325
5326static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5327{
0b246afa
JM		 5328 struct inode *inode = file_inode(file);
5329 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5330 struct btrfs_root *root = BTRFS_I(inode)->root;
5331 struct btrfs_super_block *super_block = fs_info->super_copy;
2eaa055f
JM		 5332 struct btrfs_ioctl_feature_flags flags[2];
5333 struct btrfs_trans_handle *trans;
5334 u64 newflags;
5335 int ret;
5336
5337 if (!capable(CAP_SYS_ADMIN))
5338 return -EPERM;
5339
5340 if (copy_from_user(flags, arg, sizeof(flags)))
5341 return -EFAULT;
5342
5343 /* Nothing to do */
5344 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5345 !flags[0].incompat_flags)
5346 return 0;
5347
2ff7e61e 5348 ret = check_feature(fs_info, flags[0].compat_flags,
2eaa055f
JM		 5349 flags[1].compat_flags, COMPAT);
5350 if (ret)
5351 return ret;
5352
2ff7e61e 5353 ret = check_feature(fs_info, flags[0].compat_ro_flags,
2eaa055f
JM		 5354 flags[1].compat_ro_flags, COMPAT_RO);
5355 if (ret)
5356 return ret;
5357
2ff7e61e 5358 ret = check_feature(fs_info, flags[0].incompat_flags,
2eaa055f
JM		 5359 flags[1].incompat_flags, INCOMPAT);
5360 if (ret)
5361 return ret;
5362
7ab19625
DS		 5363 ret = mnt_want_write_file(file);
5364 if (ret)
5365 return ret;
5366
8051aa1a 5367 trans = btrfs_start_transaction(root, 0);
7ab19625
DS		 5368 if (IS_ERR(trans)) {
5369 ret = PTR_ERR(trans);
5370 goto out_drop_write;
5371 }
2eaa055f 5372
0b246afa 5373 spin_lock(&fs_info->super_lock);
2eaa055f
JM		 5374 newflags = btrfs_super_compat_flags(super_block);
5375 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5376 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5377 btrfs_set_super_compat_flags(super_block, newflags);
5378
5379 newflags = btrfs_super_compat_ro_flags(super_block);
5380 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5381 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5382 btrfs_set_super_compat_ro_flags(super_block, newflags);
5383
5384 newflags = btrfs_super_incompat_flags(super_block);
5385 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5386 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5387 btrfs_set_super_incompat_flags(super_block, newflags);
0b246afa 5388 spin_unlock(&fs_info->super_lock);
2eaa055f 5389
3a45bb20 5390 ret = btrfs_commit_transaction(trans);
7ab19625
DS		 5391out_drop_write:
5392 mnt_drop_write_file(file);
5393
5394 return ret;
2eaa055f
JM		 5395}
5396
2351f431
JB		 5397static int _btrfs_ioctl_send(struct file *file, void __user *argp, bool compat)
5398{
5399 struct btrfs_ioctl_send_args *arg;
5400 int ret;
5401
5402 if (compat) {
5403#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5404 struct btrfs_ioctl_send_args_32 args32;
5405
5406 ret = copy_from_user(&args32, argp, sizeof(args32));
5407 if (ret)
5408 return -EFAULT;
5409 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
5410 if (!arg)
5411 return -ENOMEM;
5412 arg->send_fd = args32.send_fd;
5413 arg->clone_sources_count = args32.clone_sources_count;
5414 arg->clone_sources = compat_ptr(args32.clone_sources);
5415 arg->parent_root = args32.parent_root;
5416 arg->flags = args32.flags;
5417 memcpy(arg->reserved, args32.reserved,
5418 sizeof(args32.reserved));
5419#else
5420 return -ENOTTY;
5421#endif
5422 } else {
5423 arg = memdup_user(argp, sizeof(*arg));
5424 if (IS_ERR(arg))
5425 return PTR_ERR(arg);
5426 }
5427 ret = btrfs_ioctl_send(file, arg);
5428 kfree(arg);
5429 return ret;
5430}
5431
f46b5a66
CH		 5432long btrfs_ioctl(struct file *file, unsigned int
5433 cmd, unsigned long arg)
5434{
0b246afa
JM		 5435 struct inode *inode = file_inode(file);
5436 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
5437 struct btrfs_root *root = BTRFS_I(inode)->root;
4bcabaa3 5438 void __user *argp = (void __user *)arg;
f46b5a66
CH		 5439
5440 switch (cmd) {
6cbff00f
CH		 5441 case FS_IOC_GETFLAGS:
5442 return btrfs_ioctl_getflags(file, argp);
5443 case FS_IOC_SETFLAGS:
5444 return btrfs_ioctl_setflags(file, argp);
5445 case FS_IOC_GETVERSION:
5446 return btrfs_ioctl_getversion(file, argp);
40cf931f
ES		 5447 case FS_IOC_GETFSLABEL:
5448 return btrfs_ioctl_get_fslabel(file, argp);
5449 case FS_IOC_SETFSLABEL:
5450 return btrfs_ioctl_set_fslabel(file, argp);
f7039b1d
LD		 5451 case FITRIM:
5452 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 5453 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 5454 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 5455 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 5456 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 5457 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 5458 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 5459 case BTRFS_IOC_SUBVOL_CREATE_V2:
5460 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 5461 case BTRFS_IOC_SNAP_DESTROY:
5462 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 5463 case BTRFS_IOC_SUBVOL_GETFLAGS:
5464 return btrfs_ioctl_subvol_getflags(file, argp);
5465 case BTRFS_IOC_SUBVOL_SETFLAGS:
5466 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 5467 case BTRFS_IOC_DEFAULT_SUBVOL:
5468 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 5469 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 5470 return btrfs_ioctl_defrag(file, NULL);
5471 case BTRFS_IOC_DEFRAG_RANGE:
5472 return btrfs_ioctl_defrag(file, argp);
f46b5a66 5473 case BTRFS_IOC_RESIZE:
198605a8 5474 return btrfs_ioctl_resize(file, argp);
f46b5a66 5475 case BTRFS_IOC_ADD_DEV:
2ff7e61e 5476 return btrfs_ioctl_add_dev(fs_info, argp);
f46b5a66 5477 case BTRFS_IOC_RM_DEV:
da24927b 5478 return btrfs_ioctl_rm_dev(file, argp);
6b526ed7
AJ		 5479 case BTRFS_IOC_RM_DEV_V2:
5480 return btrfs_ioctl_rm_dev_v2(file, argp);
475f6387 5481 case BTRFS_IOC_FS_INFO:
2ff7e61e 5482 return btrfs_ioctl_fs_info(fs_info, argp);
475f6387 5483 case BTRFS_IOC_DEV_INFO:
2ff7e61e 5484 return btrfs_ioctl_dev_info(fs_info, argp);
f46b5a66 5485 case BTRFS_IOC_BALANCE:
9ba1f6e4 5486 return btrfs_ioctl_balance(file, NULL);
ac8e9819
CM		 5487 case BTRFS_IOC_TREE_SEARCH:
5488 return btrfs_ioctl_tree_search(file, argp);
cc68a8a5
GH		 5489 case BTRFS_IOC_TREE_SEARCH_V2:
5490 return btrfs_ioctl_tree_search_v2(file, argp);
ac8e9819
CM		 5491 case BTRFS_IOC_INO_LOOKUP:
5492 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 5493 case BTRFS_IOC_INO_PATHS:
5494 return btrfs_ioctl_ino_to_path(root, argp);
5495 case BTRFS_IOC_LOGICAL_INO:
d24a67b2
ZB		 5496 return btrfs_ioctl_logical_to_ino(fs_info, argp, 1);
5497 case BTRFS_IOC_LOGICAL_INO_V2:
5498 return btrfs_ioctl_logical_to_ino(fs_info, argp, 2);
1406e432 5499 case BTRFS_IOC_SPACE_INFO:
2ff7e61e 5500 return btrfs_ioctl_space_info(fs_info, argp);
9b199859
FDBM		 5501 case BTRFS_IOC_SYNC: {
5502 int ret;
5503
82b3e53b 5504 ret = btrfs_start_delalloc_roots(fs_info, -1);
9b199859
FDBM		 5505 if (ret)
5506 return ret;
0b246afa 5507 ret = btrfs_sync_fs(inode->i_sb, 1);
2fad4e83
DS		 5508 /*
5509 * The transaction thread may want to do more work,
01327610 5510 * namely it pokes the cleaner kthread that will start
2fad4e83
DS		 5511 * processing uncleaned subvols.
5512 */
0b246afa 5513 wake_up_process(fs_info->transaction_kthread);
9b199859
FDBM		 5514 return ret;
5515 }
46204592 5516 case BTRFS_IOC_START_SYNC:
9a8c28be 5517 return btrfs_ioctl_start_sync(root, argp);
46204592 5518 case BTRFS_IOC_WAIT_SYNC:
2ff7e61e 5519 return btrfs_ioctl_wait_sync(fs_info, argp);
475f6387 5520 case BTRFS_IOC_SCRUB:
b8e95489 5521 return btrfs_ioctl_scrub(file, argp);
475f6387 5522 case BTRFS_IOC_SCRUB_CANCEL:
2ff7e61e 5523 return btrfs_ioctl_scrub_cancel(fs_info);
475f6387 5524 case BTRFS_IOC_SCRUB_PROGRESS:
2ff7e61e 5525 return btrfs_ioctl_scrub_progress(fs_info, argp);
c9e9f97b 5526 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 5527 return btrfs_ioctl_balance(file, argp);
837d5b6e 5528 case BTRFS_IOC_BALANCE_CTL:
2ff7e61e 5529 return btrfs_ioctl_balance_ctl(fs_info, arg);
19a39dce 5530 case BTRFS_IOC_BALANCE_PROGRESS:
2ff7e61e 5531 return btrfs_ioctl_balance_progress(fs_info, argp);
8ea05e3a
AB		 5532 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5533 return btrfs_ioctl_set_received_subvol(file, argp);
abccd00f
HM		 5534#ifdef CONFIG_64BIT
5535 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5536 return btrfs_ioctl_set_received_subvol_32(file, argp);
5537#endif
31db9f7c 5538 case BTRFS_IOC_SEND:
2351f431
JB		 5539 return _btrfs_ioctl_send(file, argp, false);
5540#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5541 case BTRFS_IOC_SEND_32:
5542 return _btrfs_ioctl_send(file, argp, true);
5543#endif
c11d2c23 5544 case BTRFS_IOC_GET_DEV_STATS:
2ff7e61e 5545 return btrfs_ioctl_get_dev_stats(fs_info, argp);
5d13a37b 5546 case BTRFS_IOC_QUOTA_CTL:
905b0dda 5547 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 5548 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 5549 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 5550 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 5551 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 5552 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 5553 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 5554 case BTRFS_IOC_QUOTA_RESCAN:
5555 return btrfs_ioctl_quota_rescan(file, argp);
5556 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5557 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 5558 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5559 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd 5560 case BTRFS_IOC_DEV_REPLACE:
2ff7e61e 5561 return btrfs_ioctl_dev_replace(fs_info, argp);
2eaa055f 5562 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
d5131b65 5563 return btrfs_ioctl_get_supported_features(argp);
2eaa055f
JM		 5564 case BTRFS_IOC_GET_FEATURES:
5565 return btrfs_ioctl_get_features(file, argp);
5566 case BTRFS_IOC_SET_FEATURES:
5567 return btrfs_ioctl_set_features(file, argp);
e4202ac9
DS		 5568 case FS_IOC_FSGETXATTR:
5569 return btrfs_ioctl_fsgetxattr(file, argp);
025f2121
DS		 5570 case FS_IOC_FSSETXATTR:
5571 return btrfs_ioctl_fssetxattr(file, argp);
b64ec075
TM		 5572 case BTRFS_IOC_GET_SUBVOL_INFO:
5573 return btrfs_ioctl_get_subvol_info(file, argp);
42e4b520
TM		 5574 case BTRFS_IOC_GET_SUBVOL_ROOTREF:
5575 return btrfs_ioctl_get_subvol_rootref(file, argp);
23d0b79d
TM		 5576 case BTRFS_IOC_INO_LOOKUP_USER:
5577 return btrfs_ioctl_ino_lookup_user(file, argp);
f46b5a66
CH		 5578 }
5579
5580 return -ENOTTY;
5581}
4c63c245
LD		 5582
5583#ifdef CONFIG_COMPAT
5584long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5585{
2a362249
JM		 5586 /*
5587 * These all access 32-bit values anyway so no further
5588 * handling is necessary.
5589 */
4c63c245
LD		 5590 switch (cmd) {
5591 case FS_IOC32_GETFLAGS:
5592 cmd = FS_IOC_GETFLAGS;
5593 break;
5594 case FS_IOC32_SETFLAGS:
5595 cmd = FS_IOC_SETFLAGS;
5596 break;
5597 case FS_IOC32_GETVERSION:
5598 cmd = FS_IOC_GETVERSION;
5599 break;
4c63c245
LD		 5600 }
5601
5602 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
5603}
5604#endif
Linux 6.x block layer and io_uring tree(s)