1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <linux/kernel.h>
8 #include <linux/file.h>
10 #include <linux/fsnotify.h>
11 #include <linux/pagemap.h>
12 #include <linux/highmem.h>
13 #include <linux/time.h>
14 #include <linux/string.h>
15 #include <linux/backing-dev.h>
16 #include <linux/mount.h>
17 #include <linux/namei.h>
18 #include <linux/writeback.h>
19 #include <linux/compat.h>
20 #include <linux/security.h>
21 #include <linux/xattr.h>
23 #include <linux/slab.h>
24 #include <linux/blkdev.h>
25 #include <linux/uuid.h>
26 #include <linux/btrfs.h>
27 #include <linux/uaccess.h>
28 #include <linux/iversion.h>
29 #include <linux/fileattr.h>
30 #include <linux/fsverity.h>
34 #include "transaction.h"
35 #include "btrfs_inode.h"
36 #include "print-tree.h"
40 #include "rcu-string.h"
42 #include "dev-replace.h"
47 #include "compression.h"
48 #include "space-info.h"
49 #include "delalloc-space.h"
50 #include "block-group.h"
53 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
54 * structures are incorrect, as the timespec structure from userspace
55 * is 4 bytes too small. We define these alternatives here to teach
56 * the kernel about the 32-bit struct packing.
58 struct btrfs_ioctl_timespec_32
{
61 } __attribute__ ((__packed__
));
63 struct btrfs_ioctl_received_subvol_args_32
{
64 char uuid
[BTRFS_UUID_SIZE
]; /* in */
65 __u64 stransid
; /* in */
66 __u64 rtransid
; /* out */
67 struct btrfs_ioctl_timespec_32 stime
; /* in */
68 struct btrfs_ioctl_timespec_32 rtime
; /* out */
70 __u64 reserved
[16]; /* in */
71 } __attribute__ ((__packed__
));
73 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
74 struct btrfs_ioctl_received_subvol_args_32)
77 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
78 struct btrfs_ioctl_send_args_32
{
79 __s64 send_fd
; /* in */
80 __u64 clone_sources_count
; /* in */
81 compat_uptr_t clone_sources
; /* in */
82 __u64 parent_root
; /* in */
84 __u64 reserved
[4]; /* in */
85 } __attribute__ ((__packed__
));
87 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
88 struct btrfs_ioctl_send_args_32)
91 /* Mask out flags that are inappropriate for the given type of inode. */
92 static unsigned int btrfs_mask_fsflags_for_type(struct inode
*inode
,
95 if (S_ISDIR(inode
->i_mode
))
97 else if (S_ISREG(inode
->i_mode
))
98 return flags
& ~FS_DIRSYNC_FL
;
100 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
104 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
107 static unsigned int btrfs_inode_flags_to_fsflags(struct btrfs_inode
*binode
)
109 unsigned int iflags
= 0;
110 u32 flags
= binode
->flags
;
111 u32 ro_flags
= binode
->ro_flags
;
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
;
125 if (flags
& BTRFS_INODE_NODATACOW
)
126 iflags
|= FS_NOCOW_FL
;
127 if (ro_flags
& BTRFS_INODE_RO_VERITY
)
128 iflags
|= FS_VERITY_FL
;
130 if (flags
& BTRFS_INODE_NOCOMPRESS
)
131 iflags
|= FS_NOCOMP_FL
;
132 else if (flags
& BTRFS_INODE_COMPRESS
)
133 iflags
|= FS_COMPR_FL
;
139 * Update inode->i_flags based on the btrfs internal flags.
141 void btrfs_sync_inode_flags_to_i_flags(struct inode
*inode
)
143 struct btrfs_inode
*binode
= BTRFS_I(inode
);
144 unsigned int new_fl
= 0;
146 if (binode
->flags
& BTRFS_INODE_SYNC
)
148 if (binode
->flags
& BTRFS_INODE_IMMUTABLE
)
149 new_fl
|= S_IMMUTABLE
;
150 if (binode
->flags
& BTRFS_INODE_APPEND
)
152 if (binode
->flags
& BTRFS_INODE_NOATIME
)
154 if (binode
->flags
& BTRFS_INODE_DIRSYNC
)
156 if (binode
->ro_flags
& BTRFS_INODE_RO_VERITY
)
159 set_mask_bits(&inode
->i_flags
,
160 S_SYNC
| S_APPEND
| S_IMMUTABLE
| S_NOATIME
| S_DIRSYNC
|
165 * Check if @flags are a supported and valid set of FS_*_FL flags and that
166 * the old and new flags are not conflicting
168 static int check_fsflags(unsigned int old_flags
, unsigned int flags
)
170 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
171 FS_NOATIME_FL
| FS_NODUMP_FL
| \
172 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
173 FS_NOCOMP_FL
| FS_COMPR_FL
|
177 /* COMPR and NOCOMP on new/old are valid */
178 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
181 if ((flags
& FS_COMPR_FL
) && (flags
& FS_NOCOW_FL
))
184 /* NOCOW and compression options are mutually exclusive */
185 if ((old_flags
& FS_NOCOW_FL
) && (flags
& (FS_COMPR_FL
| FS_NOCOMP_FL
)))
187 if ((flags
& FS_NOCOW_FL
) && (old_flags
& (FS_COMPR_FL
| FS_NOCOMP_FL
)))
193 static int check_fsflags_compatible(struct btrfs_fs_info
*fs_info
,
196 if (btrfs_is_zoned(fs_info
) && (flags
& FS_NOCOW_FL
))
203 * Set flags/xflags from the internal inode flags. The remaining items of
204 * fsxattr are zeroed.
206 int btrfs_fileattr_get(struct dentry
*dentry
, struct fileattr
*fa
)
208 struct btrfs_inode
*binode
= BTRFS_I(d_inode(dentry
));
210 fileattr_fill_flags(fa
, btrfs_inode_flags_to_fsflags(binode
));
214 int btrfs_fileattr_set(struct user_namespace
*mnt_userns
,
215 struct dentry
*dentry
, struct fileattr
*fa
)
217 struct inode
*inode
= d_inode(dentry
);
218 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
219 struct btrfs_inode
*binode
= BTRFS_I(inode
);
220 struct btrfs_root
*root
= binode
->root
;
221 struct btrfs_trans_handle
*trans
;
222 unsigned int fsflags
, old_fsflags
;
224 const char *comp
= NULL
;
227 if (btrfs_root_readonly(root
))
230 if (fileattr_has_fsx(fa
))
233 fsflags
= btrfs_mask_fsflags_for_type(inode
, fa
->flags
);
234 old_fsflags
= btrfs_inode_flags_to_fsflags(binode
);
235 ret
= check_fsflags(old_fsflags
, fsflags
);
239 ret
= check_fsflags_compatible(fs_info
, fsflags
);
243 binode_flags
= binode
->flags
;
244 if (fsflags
& FS_SYNC_FL
)
245 binode_flags
|= BTRFS_INODE_SYNC
;
247 binode_flags
&= ~BTRFS_INODE_SYNC
;
248 if (fsflags
& FS_IMMUTABLE_FL
)
249 binode_flags
|= BTRFS_INODE_IMMUTABLE
;
251 binode_flags
&= ~BTRFS_INODE_IMMUTABLE
;
252 if (fsflags
& FS_APPEND_FL
)
253 binode_flags
|= BTRFS_INODE_APPEND
;
255 binode_flags
&= ~BTRFS_INODE_APPEND
;
256 if (fsflags
& FS_NODUMP_FL
)
257 binode_flags
|= BTRFS_INODE_NODUMP
;
259 binode_flags
&= ~BTRFS_INODE_NODUMP
;
260 if (fsflags
& FS_NOATIME_FL
)
261 binode_flags
|= BTRFS_INODE_NOATIME
;
263 binode_flags
&= ~BTRFS_INODE_NOATIME
;
265 /* If coming from FS_IOC_FSSETXATTR then skip unconverted flags */
266 if (!fa
->flags_valid
) {
267 /* 1 item for the inode */
268 trans
= btrfs_start_transaction(root
, 1);
270 return PTR_ERR(trans
);
274 if (fsflags
& FS_DIRSYNC_FL
)
275 binode_flags
|= BTRFS_INODE_DIRSYNC
;
277 binode_flags
&= ~BTRFS_INODE_DIRSYNC
;
278 if (fsflags
& FS_NOCOW_FL
) {
279 if (S_ISREG(inode
->i_mode
)) {
281 * It's safe to turn csums off here, no extents exist.
282 * Otherwise we want the flag to reflect the real COW
283 * status of the file and will not set it.
285 if (inode
->i_size
== 0)
286 binode_flags
|= BTRFS_INODE_NODATACOW
|
287 BTRFS_INODE_NODATASUM
;
289 binode_flags
|= BTRFS_INODE_NODATACOW
;
293 * Revert back under same assumptions as above
295 if (S_ISREG(inode
->i_mode
)) {
296 if (inode
->i_size
== 0)
297 binode_flags
&= ~(BTRFS_INODE_NODATACOW
|
298 BTRFS_INODE_NODATASUM
);
300 binode_flags
&= ~BTRFS_INODE_NODATACOW
;
305 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
306 * flag may be changed automatically if compression code won't make
309 if (fsflags
& FS_NOCOMP_FL
) {
310 binode_flags
&= ~BTRFS_INODE_COMPRESS
;
311 binode_flags
|= BTRFS_INODE_NOCOMPRESS
;
312 } else if (fsflags
& FS_COMPR_FL
) {
314 if (IS_SWAPFILE(inode
))
317 binode_flags
|= BTRFS_INODE_COMPRESS
;
318 binode_flags
&= ~BTRFS_INODE_NOCOMPRESS
;
320 comp
= btrfs_compress_type2str(fs_info
->compress_type
);
321 if (!comp
|| comp
[0] == 0)
322 comp
= btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB
);
324 binode_flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
331 trans
= btrfs_start_transaction(root
, 3);
333 return PTR_ERR(trans
);
336 ret
= btrfs_set_prop(trans
, inode
, "btrfs.compression", comp
,
339 btrfs_abort_transaction(trans
, ret
);
343 ret
= btrfs_set_prop(trans
, inode
, "btrfs.compression", NULL
,
345 if (ret
&& ret
!= -ENODATA
) {
346 btrfs_abort_transaction(trans
, ret
);
352 binode
->flags
= binode_flags
;
353 btrfs_sync_inode_flags_to_i_flags(inode
);
354 inode_inc_iversion(inode
);
355 inode
->i_ctime
= current_time(inode
);
356 ret
= btrfs_update_inode(trans
, root
, BTRFS_I(inode
));
359 btrfs_end_transaction(trans
);
364 * Start exclusive operation @type, return true on success
366 bool btrfs_exclop_start(struct btrfs_fs_info
*fs_info
,
367 enum btrfs_exclusive_operation type
)
371 spin_lock(&fs_info
->super_lock
);
372 if (fs_info
->exclusive_operation
== BTRFS_EXCLOP_NONE
) {
373 fs_info
->exclusive_operation
= type
;
376 spin_unlock(&fs_info
->super_lock
);
382 * Conditionally allow to enter the exclusive operation in case it's compatible
383 * with the running one. This must be paired with btrfs_exclop_start_unlock and
384 * btrfs_exclop_finish.
387 * - the same type is already running
388 * - not BTRFS_EXCLOP_NONE - this is intentionally incompatible and the caller
389 * must check the condition first that would allow none -> @type
391 bool btrfs_exclop_start_try_lock(struct btrfs_fs_info
*fs_info
,
392 enum btrfs_exclusive_operation type
)
394 spin_lock(&fs_info
->super_lock
);
395 if (fs_info
->exclusive_operation
== type
)
398 spin_unlock(&fs_info
->super_lock
);
402 void btrfs_exclop_start_unlock(struct btrfs_fs_info
*fs_info
)
404 spin_unlock(&fs_info
->super_lock
);
407 void btrfs_exclop_finish(struct btrfs_fs_info
*fs_info
)
409 spin_lock(&fs_info
->super_lock
);
410 WRITE_ONCE(fs_info
->exclusive_operation
, BTRFS_EXCLOP_NONE
);
411 spin_unlock(&fs_info
->super_lock
);
412 sysfs_notify(&fs_info
->fs_devices
->fsid_kobj
, NULL
, "exclusive_operation");
415 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
417 struct inode
*inode
= file_inode(file
);
419 return put_user(inode
->i_generation
, arg
);
422 static noinline
int btrfs_ioctl_fitrim(struct btrfs_fs_info
*fs_info
,
425 struct btrfs_device
*device
;
426 struct request_queue
*q
;
427 struct fstrim_range range
;
428 u64 minlen
= ULLONG_MAX
;
432 if (!capable(CAP_SYS_ADMIN
))
436 * btrfs_trim_block_group() depends on space cache, which is not
437 * available in zoned filesystem. So, disallow fitrim on a zoned
438 * filesystem for now.
440 if (btrfs_is_zoned(fs_info
))
444 * If the fs is mounted with nologreplay, which requires it to be
445 * mounted in RO mode as well, we can not allow discard on free space
446 * inside block groups, because log trees refer to extents that are not
447 * pinned in a block group's free space cache (pinning the extents is
448 * precisely the first phase of replaying a log tree).
450 if (btrfs_test_opt(fs_info
, NOLOGREPLAY
))
454 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
458 q
= bdev_get_queue(device
->bdev
);
459 if (blk_queue_discard(q
)) {
461 minlen
= min_t(u64
, q
->limits
.discard_granularity
,
469 if (copy_from_user(&range
, arg
, sizeof(range
)))
473 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
474 * block group is in the logical address space, which can be any
475 * sectorsize aligned bytenr in the range [0, U64_MAX].
477 if (range
.len
< fs_info
->sb
->s_blocksize
)
480 range
.minlen
= max(range
.minlen
, minlen
);
481 ret
= btrfs_trim_fs(fs_info
, &range
);
485 if (copy_to_user(arg
, &range
, sizeof(range
)))
491 int __pure
btrfs_is_empty_uuid(u8
*uuid
)
495 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
502 static noinline
int create_subvol(struct user_namespace
*mnt_userns
,
503 struct inode
*dir
, struct dentry
*dentry
,
504 const char *name
, int namelen
,
505 struct btrfs_qgroup_inherit
*inherit
)
507 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
508 struct btrfs_trans_handle
*trans
;
509 struct btrfs_key key
;
510 struct btrfs_root_item
*root_item
;
511 struct btrfs_inode_item
*inode_item
;
512 struct extent_buffer
*leaf
;
513 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
514 struct btrfs_root
*new_root
;
515 struct btrfs_block_rsv block_rsv
;
516 struct timespec64 cur_time
= current_time(dir
);
524 root_item
= kzalloc(sizeof(*root_item
), GFP_KERNEL
);
528 ret
= btrfs_get_free_objectid(fs_info
->tree_root
, &objectid
);
532 ret
= get_anon_bdev(&anon_dev
);
537 * Don't create subvolume whose level is not zero. Or qgroup will be
538 * screwed up since it assumes subvolume qgroup's level to be 0.
540 if (btrfs_qgroup_level(objectid
)) {
545 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
547 * The same as the snapshot creation, please see the comment
548 * of create_snapshot().
550 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
, 8, false);
554 trans
= btrfs_start_transaction(root
, 0);
556 ret
= PTR_ERR(trans
);
557 btrfs_subvolume_release_metadata(root
, &block_rsv
);
560 trans
->block_rsv
= &block_rsv
;
561 trans
->bytes_reserved
= block_rsv
.size
;
563 ret
= btrfs_qgroup_inherit(trans
, 0, objectid
, inherit
);
567 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0,
568 BTRFS_NESTING_NORMAL
);
574 btrfs_mark_buffer_dirty(leaf
);
576 inode_item
= &root_item
->inode
;
577 btrfs_set_stack_inode_generation(inode_item
, 1);
578 btrfs_set_stack_inode_size(inode_item
, 3);
579 btrfs_set_stack_inode_nlink(inode_item
, 1);
580 btrfs_set_stack_inode_nbytes(inode_item
,
582 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
584 btrfs_set_root_flags(root_item
, 0);
585 btrfs_set_root_limit(root_item
, 0);
586 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
588 btrfs_set_root_bytenr(root_item
, leaf
->start
);
589 btrfs_set_root_generation(root_item
, trans
->transid
);
590 btrfs_set_root_level(root_item
, 0);
591 btrfs_set_root_refs(root_item
, 1);
592 btrfs_set_root_used(root_item
, leaf
->len
);
593 btrfs_set_root_last_snapshot(root_item
, 0);
595 btrfs_set_root_generation_v2(root_item
,
596 btrfs_root_generation(root_item
));
597 generate_random_guid(root_item
->uuid
);
598 btrfs_set_stack_timespec_sec(&root_item
->otime
, cur_time
.tv_sec
);
599 btrfs_set_stack_timespec_nsec(&root_item
->otime
, cur_time
.tv_nsec
);
600 root_item
->ctime
= root_item
->otime
;
601 btrfs_set_root_ctransid(root_item
, trans
->transid
);
602 btrfs_set_root_otransid(root_item
, trans
->transid
);
604 btrfs_tree_unlock(leaf
);
606 btrfs_set_root_dirid(root_item
, BTRFS_FIRST_FREE_OBJECTID
);
608 key
.objectid
= objectid
;
610 key
.type
= BTRFS_ROOT_ITEM_KEY
;
611 ret
= btrfs_insert_root(trans
, fs_info
->tree_root
, &key
,
615 * Since we don't abort the transaction in this case, free the
616 * tree block so that we don't leak space and leave the
617 * filesystem in an inconsistent state (an extent item in the
618 * extent tree without backreferences). Also no need to have
619 * the tree block locked since it is not in any tree at this
620 * point, so no other task can find it and use it.
622 btrfs_free_tree_block(trans
, root
, leaf
, 0, 1);
623 free_extent_buffer(leaf
);
627 free_extent_buffer(leaf
);
630 key
.offset
= (u64
)-1;
631 new_root
= btrfs_get_new_fs_root(fs_info
, objectid
, anon_dev
);
632 if (IS_ERR(new_root
)) {
633 free_anon_bdev(anon_dev
);
634 ret
= PTR_ERR(new_root
);
635 btrfs_abort_transaction(trans
, ret
);
638 /* Freeing will be done in btrfs_put_root() of new_root */
641 ret
= btrfs_record_root_in_trans(trans
, new_root
);
643 btrfs_put_root(new_root
);
644 btrfs_abort_transaction(trans
, ret
);
648 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, mnt_userns
);
649 btrfs_put_root(new_root
);
651 /* We potentially lose an unused inode item here */
652 btrfs_abort_transaction(trans
, ret
);
657 * insert the directory item
659 ret
= btrfs_set_inode_index(BTRFS_I(dir
), &index
);
661 btrfs_abort_transaction(trans
, ret
);
665 ret
= btrfs_insert_dir_item(trans
, name
, namelen
, BTRFS_I(dir
), &key
,
666 BTRFS_FT_DIR
, index
);
668 btrfs_abort_transaction(trans
, ret
);
672 btrfs_i_size_write(BTRFS_I(dir
), dir
->i_size
+ namelen
* 2);
673 ret
= btrfs_update_inode(trans
, root
, BTRFS_I(dir
));
675 btrfs_abort_transaction(trans
, ret
);
679 ret
= btrfs_add_root_ref(trans
, objectid
, root
->root_key
.objectid
,
680 btrfs_ino(BTRFS_I(dir
)), index
, name
, namelen
);
682 btrfs_abort_transaction(trans
, ret
);
686 ret
= btrfs_uuid_tree_add(trans
, root_item
->uuid
,
687 BTRFS_UUID_KEY_SUBVOL
, objectid
);
689 btrfs_abort_transaction(trans
, ret
);
693 trans
->block_rsv
= NULL
;
694 trans
->bytes_reserved
= 0;
695 btrfs_subvolume_release_metadata(root
, &block_rsv
);
697 err
= btrfs_commit_transaction(trans
);
702 inode
= btrfs_lookup_dentry(dir
, dentry
);
704 return PTR_ERR(inode
);
705 d_instantiate(dentry
, inode
);
711 free_anon_bdev(anon_dev
);
716 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
717 struct dentry
*dentry
, bool readonly
,
718 struct btrfs_qgroup_inherit
*inherit
)
720 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
722 struct btrfs_pending_snapshot
*pending_snapshot
;
723 struct btrfs_trans_handle
*trans
;
726 if (!test_bit(BTRFS_ROOT_SHAREABLE
, &root
->state
))
729 if (atomic_read(&root
->nr_swapfiles
)) {
731 "cannot snapshot subvolume with active swapfile");
735 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_KERNEL
);
736 if (!pending_snapshot
)
739 ret
= get_anon_bdev(&pending_snapshot
->anon_dev
);
742 pending_snapshot
->root_item
= kzalloc(sizeof(struct btrfs_root_item
),
744 pending_snapshot
->path
= btrfs_alloc_path();
745 if (!pending_snapshot
->root_item
|| !pending_snapshot
->path
) {
750 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
751 BTRFS_BLOCK_RSV_TEMP
);
753 * 1 - parent dir inode
756 * 2 - root ref/backref
757 * 1 - root of snapshot
760 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
761 &pending_snapshot
->block_rsv
, 8,
766 pending_snapshot
->dentry
= dentry
;
767 pending_snapshot
->root
= root
;
768 pending_snapshot
->readonly
= readonly
;
769 pending_snapshot
->dir
= dir
;
770 pending_snapshot
->inherit
= inherit
;
772 trans
= btrfs_start_transaction(root
, 0);
774 ret
= PTR_ERR(trans
);
778 trans
->pending_snapshot
= pending_snapshot
;
780 ret
= btrfs_commit_transaction(trans
);
784 ret
= pending_snapshot
->error
;
788 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
792 inode
= btrfs_lookup_dentry(d_inode(dentry
->d_parent
), dentry
);
794 ret
= PTR_ERR(inode
);
798 d_instantiate(dentry
, inode
);
800 pending_snapshot
->anon_dev
= 0;
802 /* Prevent double freeing of anon_dev */
803 if (ret
&& pending_snapshot
->snap
)
804 pending_snapshot
->snap
->anon_dev
= 0;
805 btrfs_put_root(pending_snapshot
->snap
);
806 btrfs_subvolume_release_metadata(root
, &pending_snapshot
->block_rsv
);
808 if (pending_snapshot
->anon_dev
)
809 free_anon_bdev(pending_snapshot
->anon_dev
);
810 kfree(pending_snapshot
->root_item
);
811 btrfs_free_path(pending_snapshot
->path
);
812 kfree(pending_snapshot
);
817 /* copy of may_delete in fs/namei.c()
818 * Check whether we can remove a link victim from directory dir, check
819 * whether the type of victim is right.
820 * 1. We can't do it if dir is read-only (done in permission())
821 * 2. We should have write and exec permissions on dir
822 * 3. We can't remove anything from append-only dir
823 * 4. We can't do anything with immutable dir (done in permission())
824 * 5. If the sticky bit on dir is set we should either
825 * a. be owner of dir, or
826 * b. be owner of victim, or
827 * c. have CAP_FOWNER capability
828 * 6. If the victim is append-only or immutable we can't do anything with
829 * links pointing to it.
830 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
831 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
832 * 9. We can't remove a root or mountpoint.
833 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
834 * nfs_async_unlink().
837 static int btrfs_may_delete(struct user_namespace
*mnt_userns
,
838 struct inode
*dir
, struct dentry
*victim
, int isdir
)
842 if (d_really_is_negative(victim
))
845 BUG_ON(d_inode(victim
->d_parent
) != dir
);
846 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
848 error
= inode_permission(mnt_userns
, dir
, MAY_WRITE
| MAY_EXEC
);
853 if (check_sticky(mnt_userns
, dir
, d_inode(victim
)) ||
854 IS_APPEND(d_inode(victim
)) || IS_IMMUTABLE(d_inode(victim
)) ||
855 IS_SWAPFILE(d_inode(victim
)))
858 if (!d_is_dir(victim
))
862 } else if (d_is_dir(victim
))
866 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
871 /* copy of may_create in fs/namei.c() */
872 static inline int btrfs_may_create(struct user_namespace
*mnt_userns
,
873 struct inode
*dir
, struct dentry
*child
)
875 if (d_really_is_positive(child
))
879 if (!fsuidgid_has_mapping(dir
->i_sb
, mnt_userns
))
881 return inode_permission(mnt_userns
, dir
, MAY_WRITE
| MAY_EXEC
);
885 * Create a new subvolume below @parent. This is largely modeled after
886 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
887 * inside this filesystem so it's quite a bit simpler.
889 static noinline
int btrfs_mksubvol(const struct path
*parent
,
890 struct user_namespace
*mnt_userns
,
891 const char *name
, int namelen
,
892 struct btrfs_root
*snap_src
,
894 struct btrfs_qgroup_inherit
*inherit
)
896 struct inode
*dir
= d_inode(parent
->dentry
);
897 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
898 struct dentry
*dentry
;
901 error
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
905 dentry
= lookup_one(mnt_userns
, name
, parent
->dentry
, namelen
);
906 error
= PTR_ERR(dentry
);
910 error
= btrfs_may_create(mnt_userns
, dir
, dentry
);
915 * even if this name doesn't exist, we may get hash collisions.
916 * check for them now when we can safely fail
918 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
924 down_read(&fs_info
->subvol_sem
);
926 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
930 error
= create_snapshot(snap_src
, dir
, dentry
, readonly
, inherit
);
932 error
= create_subvol(mnt_userns
, dir
, dentry
, name
, namelen
, inherit
);
935 fsnotify_mkdir(dir
, dentry
);
937 up_read(&fs_info
->subvol_sem
);
941 btrfs_inode_unlock(dir
, 0);
945 static noinline
int btrfs_mksnapshot(const struct path
*parent
,
946 struct user_namespace
*mnt_userns
,
947 const char *name
, int namelen
,
948 struct btrfs_root
*root
,
950 struct btrfs_qgroup_inherit
*inherit
)
953 bool snapshot_force_cow
= false;
956 * Force new buffered writes to reserve space even when NOCOW is
957 * possible. This is to avoid later writeback (running dealloc) to
958 * fallback to COW mode and unexpectedly fail with ENOSPC.
960 btrfs_drew_read_lock(&root
->snapshot_lock
);
962 ret
= btrfs_start_delalloc_snapshot(root
, false);
967 * All previous writes have started writeback in NOCOW mode, so now
968 * we force future writes to fallback to COW mode during snapshot
971 atomic_inc(&root
->snapshot_force_cow
);
972 snapshot_force_cow
= true;
974 btrfs_wait_ordered_extents(root
, U64_MAX
, 0, (u64
)-1);
976 ret
= btrfs_mksubvol(parent
, mnt_userns
, name
, namelen
,
977 root
, readonly
, inherit
);
979 if (snapshot_force_cow
)
980 atomic_dec(&root
->snapshot_force_cow
);
981 btrfs_drew_read_unlock(&root
->snapshot_lock
);
986 * When we're defragging a range, we don't want to kick it off again
987 * if it is really just waiting for delalloc to send it down.
988 * If we find a nice big extent or delalloc range for the bytes in the
989 * file you want to defrag, we return 0 to let you know to skip this
992 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
994 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
995 struct extent_map
*em
= NULL
;
996 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
999 read_lock(&em_tree
->lock
);
1000 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_SIZE
);
1001 read_unlock(&em_tree
->lock
);
1004 end
= extent_map_end(em
);
1005 free_extent_map(em
);
1006 if (end
- offset
> thresh
)
1009 /* if we already have a nice delalloc here, just stop */
1011 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
1012 thresh
, EXTENT_DELALLOC
, 1);
1019 * helper function to walk through a file and find extents
1020 * newer than a specific transid, and smaller than thresh.
1022 * This is used by the defragging code to find new and small
1025 static int find_new_extents(struct btrfs_root
*root
,
1026 struct inode
*inode
, u64 newer_than
,
1027 u64
*off
, u32 thresh
)
1029 struct btrfs_path
*path
;
1030 struct btrfs_key min_key
;
1031 struct extent_buffer
*leaf
;
1032 struct btrfs_file_extent_item
*extent
;
1035 u64 ino
= btrfs_ino(BTRFS_I(inode
));
1037 path
= btrfs_alloc_path();
1041 min_key
.objectid
= ino
;
1042 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
1043 min_key
.offset
= *off
;
1046 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
1050 if (min_key
.objectid
!= ino
)
1052 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
1055 leaf
= path
->nodes
[0];
1056 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1057 struct btrfs_file_extent_item
);
1059 type
= btrfs_file_extent_type(leaf
, extent
);
1060 if (type
== BTRFS_FILE_EXTENT_REG
&&
1061 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
1062 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
1063 *off
= min_key
.offset
;
1064 btrfs_free_path(path
);
1069 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
1070 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
1074 if (min_key
.offset
== (u64
)-1)
1078 btrfs_release_path(path
);
1081 btrfs_free_path(path
);
1085 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
1087 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1088 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1089 struct extent_map
*em
;
1090 u64 len
= PAGE_SIZE
;
1093 * hopefully we have this extent in the tree already, try without
1094 * the full extent lock
1096 read_lock(&em_tree
->lock
);
1097 em
= lookup_extent_mapping(em_tree
, start
, len
);
1098 read_unlock(&em_tree
->lock
);
1101 struct extent_state
*cached
= NULL
;
1102 u64 end
= start
+ len
- 1;
1104 /* get the big lock and read metadata off disk */
1105 lock_extent_bits(io_tree
, start
, end
, &cached
);
1106 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, start
, len
);
1107 unlock_extent_cached(io_tree
, start
, end
, &cached
);
1116 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1118 struct extent_map
*next
;
1121 /* this is the last extent */
1122 if (em
->start
+ em
->len
>= i_size_read(inode
))
1125 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1126 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1128 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1129 (em
->block_len
> SZ_128K
&& next
->block_len
> SZ_128K
))
1132 free_extent_map(next
);
1136 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1137 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1140 struct extent_map
*em
;
1142 bool next_mergeable
= true;
1143 bool prev_mergeable
= true;
1146 * make sure that once we start defragging an extent, we keep on
1149 if (start
< *defrag_end
)
1154 em
= defrag_lookup_extent(inode
, start
);
1158 /* this will cover holes, and inline extents */
1159 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1165 prev_mergeable
= false;
1167 next_mergeable
= defrag_check_next_extent(inode
, em
);
1169 * we hit a real extent, if it is big or the next extent is not a
1170 * real extent, don't bother defragging it
1172 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1173 (em
->len
>= thresh
|| (!next_mergeable
&& !prev_mergeable
)))
1177 * last_len ends up being a counter of how many bytes we've defragged.
1178 * every time we choose not to defrag an extent, we reset *last_len
1179 * so that the next tiny extent will force a defrag.
1181 * The end result of this is that tiny extents before a single big
1182 * extent will force at least part of that big extent to be defragged.
1185 *defrag_end
= extent_map_end(em
);
1188 *skip
= extent_map_end(em
);
1192 free_extent_map(em
);
1197 * it doesn't do much good to defrag one or two pages
1198 * at a time. This pulls in a nice chunk of pages
1199 * to COW and defrag.
1201 * It also makes sure the delalloc code has enough
1202 * dirty data to avoid making new small extents as part
1205 * It's a good idea to start RA on this range
1206 * before calling this.
1208 static int cluster_pages_for_defrag(struct inode
*inode
,
1209 struct page
**pages
,
1210 unsigned long start_index
,
1211 unsigned long num_pages
)
1213 unsigned long file_end
;
1214 u64 isize
= i_size_read(inode
);
1218 u64 start
= (u64
)start_index
<< PAGE_SHIFT
;
1223 struct btrfs_ordered_extent
*ordered
;
1224 struct extent_state
*cached_state
= NULL
;
1225 struct extent_io_tree
*tree
;
1226 struct extent_changeset
*data_reserved
= NULL
;
1227 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1229 file_end
= (isize
- 1) >> PAGE_SHIFT
;
1230 if (!isize
|| start_index
> file_end
)
1233 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1235 ret
= btrfs_delalloc_reserve_space(BTRFS_I(inode
), &data_reserved
,
1236 start
, page_cnt
<< PAGE_SHIFT
);
1240 tree
= &BTRFS_I(inode
)->io_tree
;
1242 /* step one, lock all the pages */
1243 for (i
= 0; i
< page_cnt
; i
++) {
1246 page
= find_or_create_page(inode
->i_mapping
,
1247 start_index
+ i
, mask
);
1251 ret
= set_page_extent_mapped(page
);
1258 page_start
= page_offset(page
);
1259 page_end
= page_start
+ PAGE_SIZE
- 1;
1261 lock_extent_bits(tree
, page_start
, page_end
,
1263 ordered
= btrfs_lookup_ordered_extent(BTRFS_I(inode
),
1265 unlock_extent_cached(tree
, page_start
, page_end
,
1271 btrfs_start_ordered_extent(ordered
, 1);
1272 btrfs_put_ordered_extent(ordered
);
1275 * we unlocked the page above, so we need check if
1276 * it was released or not.
1278 if (page
->mapping
!= inode
->i_mapping
) {
1285 if (!PageUptodate(page
)) {
1286 btrfs_readpage(NULL
, page
);
1288 if (!PageUptodate(page
)) {
1296 if (page
->mapping
!= inode
->i_mapping
) {
1308 if (!(inode
->i_sb
->s_flags
& SB_ACTIVE
))
1312 * so now we have a nice long stream of locked
1313 * and up to date pages, lets wait on them
1315 for (i
= 0; i
< i_done
; i
++)
1316 wait_on_page_writeback(pages
[i
]);
1318 page_start
= page_offset(pages
[0]);
1319 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_SIZE
;
1321 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1322 page_start
, page_end
- 1, &cached_state
);
1325 * When defragmenting we skip ranges that have holes or inline extents,
1326 * (check should_defrag_range()), to avoid unnecessary IO and wasting
1327 * space. At btrfs_defrag_file(), we check if a range should be defragged
1328 * before locking the inode and then, if it should, we trigger a sync
1329 * page cache readahead - we lock the inode only after that to avoid
1330 * blocking for too long other tasks that possibly want to operate on
1331 * other file ranges. But before we were able to get the inode lock,
1332 * some other task may have punched a hole in the range, or we may have
1333 * now an inline extent, in which case we should not defrag. So check
1334 * for that here, where we have the inode and the range locked, and bail
1335 * out if that happened.
1337 search_start
= page_start
;
1338 while (search_start
< page_end
) {
1339 struct extent_map
*em
;
1341 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, search_start
,
1342 page_end
- search_start
);
1345 goto out_unlock_range
;
1347 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1348 free_extent_map(em
);
1349 /* Ok, 0 means we did not defrag anything */
1351 goto out_unlock_range
;
1353 search_start
= extent_map_end(em
);
1354 free_extent_map(em
);
1357 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1358 page_end
- 1, EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
1359 EXTENT_DEFRAG
, 0, 0, &cached_state
);
1361 if (i_done
!= page_cnt
) {
1362 spin_lock(&BTRFS_I(inode
)->lock
);
1363 btrfs_mod_outstanding_extents(BTRFS_I(inode
), 1);
1364 spin_unlock(&BTRFS_I(inode
)->lock
);
1365 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
1366 start
, (page_cnt
- i_done
) << PAGE_SHIFT
, true);
1370 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1373 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1374 page_start
, page_end
- 1, &cached_state
);
1376 for (i
= 0; i
< i_done
; i
++) {
1377 clear_page_dirty_for_io(pages
[i
]);
1378 ClearPageChecked(pages
[i
]);
1379 set_page_dirty(pages
[i
]);
1380 unlock_page(pages
[i
]);
1383 btrfs_delalloc_release_extents(BTRFS_I(inode
), page_cnt
<< PAGE_SHIFT
);
1384 extent_changeset_free(data_reserved
);
1388 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1389 page_start
, page_end
- 1, &cached_state
);
1391 for (i
= 0; i
< i_done
; i
++) {
1392 unlock_page(pages
[i
]);
1395 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
1396 start
, page_cnt
<< PAGE_SHIFT
, true);
1397 btrfs_delalloc_release_extents(BTRFS_I(inode
), page_cnt
<< PAGE_SHIFT
);
1398 extent_changeset_free(data_reserved
);
1403 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1404 struct btrfs_ioctl_defrag_range_args
*range
,
1405 u64 newer_than
, unsigned long max_to_defrag
)
1407 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1408 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1409 struct file_ra_state
*ra
= NULL
;
1410 unsigned long last_index
;
1411 u64 isize
= i_size_read(inode
);
1415 u64 newer_off
= range
->start
;
1417 unsigned long ra_index
= 0;
1419 int defrag_count
= 0;
1420 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1421 u32 extent_thresh
= range
->extent_thresh
;
1422 unsigned long max_cluster
= SZ_256K
>> PAGE_SHIFT
;
1423 unsigned long cluster
= max_cluster
;
1424 u64 new_align
= ~((u64
)SZ_128K
- 1);
1425 struct page
**pages
= NULL
;
1426 bool do_compress
= range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
;
1431 if (range
->start
>= isize
)
1435 if (range
->compress_type
>= BTRFS_NR_COMPRESS_TYPES
)
1437 if (range
->compress_type
)
1438 compress_type
= range
->compress_type
;
1441 if (extent_thresh
== 0)
1442 extent_thresh
= SZ_256K
;
1445 * If we were not given a file, allocate a readahead context. As
1446 * readahead is just an optimization, defrag will work without it so
1447 * we don't error out.
1450 ra
= kzalloc(sizeof(*ra
), GFP_KERNEL
);
1452 file_ra_state_init(ra
, inode
->i_mapping
);
1457 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*), GFP_KERNEL
);
1463 /* find the last page to defrag */
1464 if (range
->start
+ range
->len
> range
->start
) {
1465 last_index
= min_t(u64
, isize
- 1,
1466 range
->start
+ range
->len
- 1) >> PAGE_SHIFT
;
1468 last_index
= (isize
- 1) >> PAGE_SHIFT
;
1472 ret
= find_new_extents(root
, inode
, newer_than
,
1473 &newer_off
, SZ_64K
);
1475 range
->start
= newer_off
;
1477 * we always align our defrag to help keep
1478 * the extents in the file evenly spaced
1480 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1484 i
= range
->start
>> PAGE_SHIFT
;
1487 max_to_defrag
= last_index
- i
+ 1;
1490 * make writeback starts from i, so the defrag range can be
1491 * written sequentially.
1493 if (i
< inode
->i_mapping
->writeback_index
)
1494 inode
->i_mapping
->writeback_index
= i
;
1496 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1497 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_SIZE
))) {
1499 * make sure we stop running if someone unmounts
1502 if (!(inode
->i_sb
->s_flags
& SB_ACTIVE
))
1505 if (btrfs_defrag_cancelled(fs_info
)) {
1506 btrfs_debug(fs_info
, "defrag_file cancelled");
1511 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_SHIFT
,
1512 extent_thresh
, &last_len
, &skip
,
1513 &defrag_end
, do_compress
)){
1516 * the should_defrag function tells us how much to skip
1517 * bump our counter by the suggested amount
1519 next
= DIV_ROUND_UP(skip
, PAGE_SIZE
);
1520 i
= max(i
+ 1, next
);
1525 cluster
= (PAGE_ALIGN(defrag_end
) >>
1527 cluster
= min(cluster
, max_cluster
);
1529 cluster
= max_cluster
;
1532 if (i
+ cluster
> ra_index
) {
1533 ra_index
= max(i
, ra_index
);
1535 page_cache_sync_readahead(inode
->i_mapping
, ra
,
1536 file
, ra_index
, cluster
);
1537 ra_index
+= cluster
;
1540 btrfs_inode_lock(inode
, 0);
1541 if (IS_SWAPFILE(inode
)) {
1545 BTRFS_I(inode
)->defrag_compress
= compress_type
;
1546 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1549 btrfs_inode_unlock(inode
, 0);
1553 defrag_count
+= ret
;
1554 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1555 btrfs_inode_unlock(inode
, 0);
1558 if (newer_off
== (u64
)-1)
1564 newer_off
= max(newer_off
+ 1,
1565 (u64
)i
<< PAGE_SHIFT
);
1567 ret
= find_new_extents(root
, inode
, newer_than
,
1568 &newer_off
, SZ_64K
);
1570 range
->start
= newer_off
;
1571 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1578 last_len
+= ret
<< PAGE_SHIFT
;
1588 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1589 filemap_flush(inode
->i_mapping
);
1590 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1591 &BTRFS_I(inode
)->runtime_flags
))
1592 filemap_flush(inode
->i_mapping
);
1595 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1596 btrfs_set_fs_incompat(fs_info
, COMPRESS_LZO
);
1597 } else if (range
->compress_type
== BTRFS_COMPRESS_ZSTD
) {
1598 btrfs_set_fs_incompat(fs_info
, COMPRESS_ZSTD
);
1603 btrfs_inode_lock(inode
, 0);
1604 BTRFS_I(inode
)->defrag_compress
= BTRFS_COMPRESS_NONE
;
1605 btrfs_inode_unlock(inode
, 0);
1614 * Try to start exclusive operation @type or cancel it if it's running.
1617 * 0 - normal mode, newly claimed op started
1618 * >0 - normal mode, something else is running,
1619 * return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS to user space
1620 * ECANCELED - cancel mode, successful cancel
1621 * ENOTCONN - cancel mode, operation not running anymore
1623 static int exclop_start_or_cancel_reloc(struct btrfs_fs_info
*fs_info
,
1624 enum btrfs_exclusive_operation type
, bool cancel
)
1627 /* Start normal op */
1628 if (!btrfs_exclop_start(fs_info
, type
))
1629 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1630 /* Exclusive operation is now claimed */
1634 /* Cancel running op */
1635 if (btrfs_exclop_start_try_lock(fs_info
, type
)) {
1637 * This blocks any exclop finish from setting it to NONE, so we
1638 * request cancellation. Either it runs and we will wait for it,
1639 * or it has finished and no waiting will happen.
1641 atomic_inc(&fs_info
->reloc_cancel_req
);
1642 btrfs_exclop_start_unlock(fs_info
);
1644 if (test_bit(BTRFS_FS_RELOC_RUNNING
, &fs_info
->flags
))
1645 wait_on_bit(&fs_info
->flags
, BTRFS_FS_RELOC_RUNNING
,
1646 TASK_INTERRUPTIBLE
);
1651 /* Something else is running or none */
1655 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1658 struct inode
*inode
= file_inode(file
);
1659 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1663 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1664 struct btrfs_ioctl_vol_args
*vol_args
;
1665 struct btrfs_trans_handle
*trans
;
1666 struct btrfs_device
*device
= NULL
;
1669 char *devstr
= NULL
;
1674 if (!capable(CAP_SYS_ADMIN
))
1677 ret
= mnt_want_write_file(file
);
1682 * Read the arguments before checking exclusivity to be able to
1683 * distinguish regular resize and cancel
1685 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1686 if (IS_ERR(vol_args
)) {
1687 ret
= PTR_ERR(vol_args
);
1690 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1691 sizestr
= vol_args
->name
;
1692 cancel
= (strcmp("cancel", sizestr
) == 0);
1693 ret
= exclop_start_or_cancel_reloc(fs_info
, BTRFS_EXCLOP_RESIZE
, cancel
);
1696 /* Exclusive operation is now claimed */
1698 devstr
= strchr(sizestr
, ':');
1700 sizestr
= devstr
+ 1;
1702 devstr
= vol_args
->name
;
1703 ret
= kstrtoull(devstr
, 10, &devid
);
1710 btrfs_info(fs_info
, "resizing devid %llu", devid
);
1713 device
= btrfs_find_device(fs_info
->fs_devices
, devid
, NULL
, NULL
);
1715 btrfs_info(fs_info
, "resizer unable to find device %llu",
1721 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
1723 "resizer unable to apply on readonly device %llu",
1729 if (!strcmp(sizestr
, "max"))
1730 new_size
= device
->bdev
->bd_inode
->i_size
;
1732 if (sizestr
[0] == '-') {
1735 } else if (sizestr
[0] == '+') {
1739 new_size
= memparse(sizestr
, &retptr
);
1740 if (*retptr
!= '\0' || new_size
== 0) {
1746 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
1751 old_size
= btrfs_device_get_total_bytes(device
);
1754 if (new_size
> old_size
) {
1758 new_size
= old_size
- new_size
;
1759 } else if (mod
> 0) {
1760 if (new_size
> ULLONG_MAX
- old_size
) {
1764 new_size
= old_size
+ new_size
;
1767 if (new_size
< SZ_256M
) {
1771 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1776 new_size
= round_down(new_size
, fs_info
->sectorsize
);
1778 if (new_size
> old_size
) {
1779 trans
= btrfs_start_transaction(root
, 0);
1780 if (IS_ERR(trans
)) {
1781 ret
= PTR_ERR(trans
);
1784 ret
= btrfs_grow_device(trans
, device
, new_size
);
1785 btrfs_commit_transaction(trans
);
1786 } else if (new_size
< old_size
) {
1787 ret
= btrfs_shrink_device(device
, new_size
);
1788 } /* equal, nothing need to do */
1790 if (ret
== 0 && new_size
!= old_size
)
1791 btrfs_info_in_rcu(fs_info
,
1792 "resize device %s (devid %llu) from %llu to %llu",
1793 rcu_str_deref(device
->name
), device
->devid
,
1794 old_size
, new_size
);
1796 btrfs_exclop_finish(fs_info
);
1800 mnt_drop_write_file(file
);
1804 static noinline
int __btrfs_ioctl_snap_create(struct file
*file
,
1805 struct user_namespace
*mnt_userns
,
1806 const char *name
, unsigned long fd
, int subvol
,
1808 struct btrfs_qgroup_inherit
*inherit
)
1813 if (!S_ISDIR(file_inode(file
)->i_mode
))
1816 ret
= mnt_want_write_file(file
);
1820 namelen
= strlen(name
);
1821 if (strchr(name
, '/')) {
1823 goto out_drop_write
;
1826 if (name
[0] == '.' &&
1827 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1829 goto out_drop_write
;
1833 ret
= btrfs_mksubvol(&file
->f_path
, mnt_userns
, name
,
1834 namelen
, NULL
, readonly
, inherit
);
1836 struct fd src
= fdget(fd
);
1837 struct inode
*src_inode
;
1840 goto out_drop_write
;
1843 src_inode
= file_inode(src
.file
);
1844 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1845 btrfs_info(BTRFS_I(file_inode(file
))->root
->fs_info
,
1846 "Snapshot src from another FS");
1848 } else if (!inode_owner_or_capable(mnt_userns
, src_inode
)) {
1850 * Subvolume creation is not restricted, but snapshots
1851 * are limited to own subvolumes only
1855 ret
= btrfs_mksnapshot(&file
->f_path
, mnt_userns
,
1857 BTRFS_I(src_inode
)->root
,
1863 mnt_drop_write_file(file
);
1868 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1869 void __user
*arg
, int subvol
)
1871 struct btrfs_ioctl_vol_args
*vol_args
;
1874 if (!S_ISDIR(file_inode(file
)->i_mode
))
1877 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1878 if (IS_ERR(vol_args
))
1879 return PTR_ERR(vol_args
);
1880 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1882 ret
= __btrfs_ioctl_snap_create(file
, file_mnt_user_ns(file
),
1883 vol_args
->name
, vol_args
->fd
, subvol
,
1890 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1891 void __user
*arg
, int subvol
)
1893 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1895 bool readonly
= false;
1896 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1898 if (!S_ISDIR(file_inode(file
)->i_mode
))
1901 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1902 if (IS_ERR(vol_args
))
1903 return PTR_ERR(vol_args
);
1904 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1906 if (vol_args
->flags
& ~BTRFS_SUBVOL_CREATE_ARGS_MASK
) {
1911 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1913 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1916 if (vol_args
->size
< sizeof(*inherit
) ||
1917 vol_args
->size
> PAGE_SIZE
) {
1921 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1922 if (IS_ERR(inherit
)) {
1923 ret
= PTR_ERR(inherit
);
1927 if (inherit
->num_qgroups
> PAGE_SIZE
||
1928 inherit
->num_ref_copies
> PAGE_SIZE
||
1929 inherit
->num_excl_copies
> PAGE_SIZE
) {
1934 nums
= inherit
->num_qgroups
+ 2 * inherit
->num_ref_copies
+
1935 2 * inherit
->num_excl_copies
;
1936 if (vol_args
->size
!= struct_size(inherit
, qgroups
, nums
)) {
1942 ret
= __btrfs_ioctl_snap_create(file
, file_mnt_user_ns(file
),
1943 vol_args
->name
, vol_args
->fd
, subvol
,
1954 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1957 struct inode
*inode
= file_inode(file
);
1958 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1959 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1963 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
)
1966 down_read(&fs_info
->subvol_sem
);
1967 if (btrfs_root_readonly(root
))
1968 flags
|= BTRFS_SUBVOL_RDONLY
;
1969 up_read(&fs_info
->subvol_sem
);
1971 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1977 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1980 struct inode
*inode
= file_inode(file
);
1981 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1982 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1983 struct btrfs_trans_handle
*trans
;
1988 if (!inode_owner_or_capable(file_mnt_user_ns(file
), inode
))
1991 ret
= mnt_want_write_file(file
);
1995 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
1997 goto out_drop_write
;
2000 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
2002 goto out_drop_write
;
2005 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
2007 goto out_drop_write
;
2010 down_write(&fs_info
->subvol_sem
);
2013 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
2016 root_flags
= btrfs_root_flags(&root
->root_item
);
2017 if (flags
& BTRFS_SUBVOL_RDONLY
) {
2018 btrfs_set_root_flags(&root
->root_item
,
2019 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
2022 * Block RO -> RW transition if this subvolume is involved in
2025 spin_lock(&root
->root_item_lock
);
2026 if (root
->send_in_progress
== 0) {
2027 btrfs_set_root_flags(&root
->root_item
,
2028 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
2029 spin_unlock(&root
->root_item_lock
);
2031 spin_unlock(&root
->root_item_lock
);
2033 "Attempt to set subvolume %llu read-write during send",
2034 root
->root_key
.objectid
);
2040 trans
= btrfs_start_transaction(root
, 1);
2041 if (IS_ERR(trans
)) {
2042 ret
= PTR_ERR(trans
);
2046 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
2047 &root
->root_key
, &root
->root_item
);
2049 btrfs_end_transaction(trans
);
2053 ret
= btrfs_commit_transaction(trans
);
2057 btrfs_set_root_flags(&root
->root_item
, root_flags
);
2059 up_write(&fs_info
->subvol_sem
);
2061 mnt_drop_write_file(file
);
2066 static noinline
int key_in_sk(struct btrfs_key
*key
,
2067 struct btrfs_ioctl_search_key
*sk
)
2069 struct btrfs_key test
;
2072 test
.objectid
= sk
->min_objectid
;
2073 test
.type
= sk
->min_type
;
2074 test
.offset
= sk
->min_offset
;
2076 ret
= btrfs_comp_cpu_keys(key
, &test
);
2080 test
.objectid
= sk
->max_objectid
;
2081 test
.type
= sk
->max_type
;
2082 test
.offset
= sk
->max_offset
;
2084 ret
= btrfs_comp_cpu_keys(key
, &test
);
2090 static noinline
int copy_to_sk(struct btrfs_path
*path
,
2091 struct btrfs_key
*key
,
2092 struct btrfs_ioctl_search_key
*sk
,
2095 unsigned long *sk_offset
,
2099 struct extent_buffer
*leaf
;
2100 struct btrfs_ioctl_search_header sh
;
2101 struct btrfs_key test
;
2102 unsigned long item_off
;
2103 unsigned long item_len
;
2109 leaf
= path
->nodes
[0];
2110 slot
= path
->slots
[0];
2111 nritems
= btrfs_header_nritems(leaf
);
2113 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
2117 found_transid
= btrfs_header_generation(leaf
);
2119 for (i
= slot
; i
< nritems
; i
++) {
2120 item_off
= btrfs_item_ptr_offset(leaf
, i
);
2121 item_len
= btrfs_item_size_nr(leaf
, i
);
2123 btrfs_item_key_to_cpu(leaf
, key
, i
);
2124 if (!key_in_sk(key
, sk
))
2127 if (sizeof(sh
) + item_len
> *buf_size
) {
2134 * return one empty item back for v1, which does not
2138 *buf_size
= sizeof(sh
) + item_len
;
2143 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
2148 sh
.objectid
= key
->objectid
;
2149 sh
.offset
= key
->offset
;
2150 sh
.type
= key
->type
;
2152 sh
.transid
= found_transid
;
2155 * Copy search result header. If we fault then loop again so we
2156 * can fault in the pages and -EFAULT there if there's a
2157 * problem. Otherwise we'll fault and then copy the buffer in
2158 * properly this next time through
2160 if (copy_to_user_nofault(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
2165 *sk_offset
+= sizeof(sh
);
2168 char __user
*up
= ubuf
+ *sk_offset
;
2170 * Copy the item, same behavior as above, but reset the
2171 * * sk_offset so we copy the full thing again.
2173 if (read_extent_buffer_to_user_nofault(leaf
, up
,
2174 item_off
, item_len
)) {
2176 *sk_offset
-= sizeof(sh
);
2180 *sk_offset
+= item_len
;
2184 if (ret
) /* -EOVERFLOW from above */
2187 if (*num_found
>= sk
->nr_items
) {
2194 test
.objectid
= sk
->max_objectid
;
2195 test
.type
= sk
->max_type
;
2196 test
.offset
= sk
->max_offset
;
2197 if (btrfs_comp_cpu_keys(key
, &test
) >= 0)
2199 else if (key
->offset
< (u64
)-1)
2201 else if (key
->type
< (u8
)-1) {
2204 } else if (key
->objectid
< (u64
)-1) {
2212 * 0: all items from this leaf copied, continue with next
2213 * 1: * more items can be copied, but unused buffer is too small
2214 * * all items were found
2215 * Either way, it will stops the loop which iterates to the next
2217 * -EOVERFLOW: item was to large for buffer
2218 * -EFAULT: could not copy extent buffer back to userspace
2223 static noinline
int search_ioctl(struct inode
*inode
,
2224 struct btrfs_ioctl_search_key
*sk
,
2228 struct btrfs_fs_info
*info
= btrfs_sb(inode
->i_sb
);
2229 struct btrfs_root
*root
;
2230 struct btrfs_key key
;
2231 struct btrfs_path
*path
;
2234 unsigned long sk_offset
= 0;
2236 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2237 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2241 path
= btrfs_alloc_path();
2245 if (sk
->tree_id
== 0) {
2246 /* search the root of the inode that was passed */
2247 root
= btrfs_grab_root(BTRFS_I(inode
)->root
);
2249 root
= btrfs_get_fs_root(info
, sk
->tree_id
, true);
2251 btrfs_free_path(path
);
2252 return PTR_ERR(root
);
2256 key
.objectid
= sk
->min_objectid
;
2257 key
.type
= sk
->min_type
;
2258 key
.offset
= sk
->min_offset
;
2261 ret
= fault_in_pages_writeable(ubuf
+ sk_offset
,
2262 *buf_size
- sk_offset
);
2266 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2272 ret
= copy_to_sk(path
, &key
, sk
, buf_size
, ubuf
,
2273 &sk_offset
, &num_found
);
2274 btrfs_release_path(path
);
2282 sk
->nr_items
= num_found
;
2283 btrfs_put_root(root
);
2284 btrfs_free_path(path
);
2288 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2291 struct btrfs_ioctl_search_args __user
*uargs
;
2292 struct btrfs_ioctl_search_key sk
;
2293 struct inode
*inode
;
2297 if (!capable(CAP_SYS_ADMIN
))
2300 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2302 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2305 buf_size
= sizeof(uargs
->buf
);
2307 inode
= file_inode(file
);
2308 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2311 * In the origin implementation an overflow is handled by returning a
2312 * search header with a len of zero, so reset ret.
2314 if (ret
== -EOVERFLOW
)
2317 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2322 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2325 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2326 struct btrfs_ioctl_search_args_v2 args
;
2327 struct inode
*inode
;
2330 const size_t buf_limit
= SZ_16M
;
2332 if (!capable(CAP_SYS_ADMIN
))
2335 /* copy search header and buffer size */
2336 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2337 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2340 buf_size
= args
.buf_size
;
2342 /* limit result size to 16MB */
2343 if (buf_size
> buf_limit
)
2344 buf_size
= buf_limit
;
2346 inode
= file_inode(file
);
2347 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2348 (char __user
*)(&uarg
->buf
[0]));
2349 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2351 else if (ret
== -EOVERFLOW
&&
2352 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2359 * Search INODE_REFs to identify path name of 'dirid' directory
2360 * in a 'tree_id' tree. and sets path name to 'name'.
2362 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2363 u64 tree_id
, u64 dirid
, char *name
)
2365 struct btrfs_root
*root
;
2366 struct btrfs_key key
;
2372 struct btrfs_inode_ref
*iref
;
2373 struct extent_buffer
*l
;
2374 struct btrfs_path
*path
;
2376 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2381 path
= btrfs_alloc_path();
2385 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
- 1];
2387 root
= btrfs_get_fs_root(info
, tree_id
, true);
2389 ret
= PTR_ERR(root
);
2394 key
.objectid
= dirid
;
2395 key
.type
= BTRFS_INODE_REF_KEY
;
2396 key
.offset
= (u64
)-1;
2399 ret
= btrfs_search_backwards(root
, &key
, path
);
2408 slot
= path
->slots
[0];
2410 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2411 len
= btrfs_inode_ref_name_len(l
, iref
);
2413 total_len
+= len
+ 1;
2415 ret
= -ENAMETOOLONG
;
2420 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2422 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2425 btrfs_release_path(path
);
2426 key
.objectid
= key
.offset
;
2427 key
.offset
= (u64
)-1;
2428 dirid
= key
.objectid
;
2430 memmove(name
, ptr
, total_len
);
2431 name
[total_len
] = '\0';
2434 btrfs_put_root(root
);
2435 btrfs_free_path(path
);
2439 static int btrfs_search_path_in_tree_user(struct user_namespace
*mnt_userns
,
2440 struct inode
*inode
,
2441 struct btrfs_ioctl_ino_lookup_user_args
*args
)
2443 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2444 struct super_block
*sb
= inode
->i_sb
;
2445 struct btrfs_key upper_limit
= BTRFS_I(inode
)->location
;
2446 u64 treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2447 u64 dirid
= args
->dirid
;
2448 unsigned long item_off
;
2449 unsigned long item_len
;
2450 struct btrfs_inode_ref
*iref
;
2451 struct btrfs_root_ref
*rref
;
2452 struct btrfs_root
*root
= NULL
;
2453 struct btrfs_path
*path
;
2454 struct btrfs_key key
, key2
;
2455 struct extent_buffer
*leaf
;
2456 struct inode
*temp_inode
;
2463 path
= btrfs_alloc_path();
2468 * If the bottom subvolume does not exist directly under upper_limit,
2469 * construct the path in from the bottom up.
2471 if (dirid
!= upper_limit
.objectid
) {
2472 ptr
= &args
->path
[BTRFS_INO_LOOKUP_USER_PATH_MAX
- 1];
2474 root
= btrfs_get_fs_root(fs_info
, treeid
, true);
2476 ret
= PTR_ERR(root
);
2480 key
.objectid
= dirid
;
2481 key
.type
= BTRFS_INODE_REF_KEY
;
2482 key
.offset
= (u64
)-1;
2484 ret
= btrfs_search_backwards(root
, &key
, path
);
2492 leaf
= path
->nodes
[0];
2493 slot
= path
->slots
[0];
2495 iref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_inode_ref
);
2496 len
= btrfs_inode_ref_name_len(leaf
, iref
);
2498 total_len
+= len
+ 1;
2499 if (ptr
< args
->path
) {
2500 ret
= -ENAMETOOLONG
;
2505 read_extent_buffer(leaf
, ptr
,
2506 (unsigned long)(iref
+ 1), len
);
2508 /* Check the read+exec permission of this directory */
2509 ret
= btrfs_previous_item(root
, path
, dirid
,
2510 BTRFS_INODE_ITEM_KEY
);
2513 } else if (ret
> 0) {
2518 leaf
= path
->nodes
[0];
2519 slot
= path
->slots
[0];
2520 btrfs_item_key_to_cpu(leaf
, &key2
, slot
);
2521 if (key2
.objectid
!= dirid
) {
2526 temp_inode
= btrfs_iget(sb
, key2
.objectid
, root
);
2527 if (IS_ERR(temp_inode
)) {
2528 ret
= PTR_ERR(temp_inode
);
2531 ret
= inode_permission(mnt_userns
, temp_inode
,
2532 MAY_READ
| MAY_EXEC
);
2539 if (key
.offset
== upper_limit
.objectid
)
2541 if (key
.objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2546 btrfs_release_path(path
);
2547 key
.objectid
= key
.offset
;
2548 key
.offset
= (u64
)-1;
2549 dirid
= key
.objectid
;
2552 memmove(args
->path
, ptr
, total_len
);
2553 args
->path
[total_len
] = '\0';
2554 btrfs_put_root(root
);
2556 btrfs_release_path(path
);
2559 /* Get the bottom subvolume's name from ROOT_REF */
2560 key
.objectid
= treeid
;
2561 key
.type
= BTRFS_ROOT_REF_KEY
;
2562 key
.offset
= args
->treeid
;
2563 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
2566 } else if (ret
> 0) {
2571 leaf
= path
->nodes
[0];
2572 slot
= path
->slots
[0];
2573 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2575 item_off
= btrfs_item_ptr_offset(leaf
, slot
);
2576 item_len
= btrfs_item_size_nr(leaf
, slot
);
2577 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2578 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2579 if (args
->dirid
!= btrfs_root_ref_dirid(leaf
, rref
)) {
2584 /* Copy subvolume's name */
2585 item_off
+= sizeof(struct btrfs_root_ref
);
2586 item_len
-= sizeof(struct btrfs_root_ref
);
2587 read_extent_buffer(leaf
, args
->name
, item_off
, item_len
);
2588 args
->name
[item_len
] = 0;
2591 btrfs_put_root(root
);
2593 btrfs_free_path(path
);
2597 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2600 struct btrfs_ioctl_ino_lookup_args
*args
;
2601 struct inode
*inode
;
2604 args
= memdup_user(argp
, sizeof(*args
));
2606 return PTR_ERR(args
);
2608 inode
= file_inode(file
);
2611 * Unprivileged query to obtain the containing subvolume root id. The
2612 * path is reset so it's consistent with btrfs_search_path_in_tree.
2614 if (args
->treeid
== 0)
2615 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2617 if (args
->objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2622 if (!capable(CAP_SYS_ADMIN
)) {
2627 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2628 args
->treeid
, args
->objectid
,
2632 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2640 * Version of ino_lookup ioctl (unprivileged)
2642 * The main differences from ino_lookup ioctl are:
2644 * 1. Read + Exec permission will be checked using inode_permission() during
2645 * path construction. -EACCES will be returned in case of failure.
2646 * 2. Path construction will be stopped at the inode number which corresponds
2647 * to the fd with which this ioctl is called. If constructed path does not
2648 * exist under fd's inode, -EACCES will be returned.
2649 * 3. The name of bottom subvolume is also searched and filled.
2651 static int btrfs_ioctl_ino_lookup_user(struct file
*file
, void __user
*argp
)
2653 struct btrfs_ioctl_ino_lookup_user_args
*args
;
2654 struct inode
*inode
;
2657 args
= memdup_user(argp
, sizeof(*args
));
2659 return PTR_ERR(args
);
2661 inode
= file_inode(file
);
2663 if (args
->dirid
== BTRFS_FIRST_FREE_OBJECTID
&&
2664 BTRFS_I(inode
)->location
.objectid
!= BTRFS_FIRST_FREE_OBJECTID
) {
2666 * The subvolume does not exist under fd with which this is
2673 ret
= btrfs_search_path_in_tree_user(file_mnt_user_ns(file
), inode
, args
);
2675 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2682 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2683 static int btrfs_ioctl_get_subvol_info(struct file
*file
, void __user
*argp
)
2685 struct btrfs_ioctl_get_subvol_info_args
*subvol_info
;
2686 struct btrfs_fs_info
*fs_info
;
2687 struct btrfs_root
*root
;
2688 struct btrfs_path
*path
;
2689 struct btrfs_key key
;
2690 struct btrfs_root_item
*root_item
;
2691 struct btrfs_root_ref
*rref
;
2692 struct extent_buffer
*leaf
;
2693 unsigned long item_off
;
2694 unsigned long item_len
;
2695 struct inode
*inode
;
2699 path
= btrfs_alloc_path();
2703 subvol_info
= kzalloc(sizeof(*subvol_info
), GFP_KERNEL
);
2705 btrfs_free_path(path
);
2709 inode
= file_inode(file
);
2710 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2712 /* Get root_item of inode's subvolume */
2713 key
.objectid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2714 root
= btrfs_get_fs_root(fs_info
, key
.objectid
, true);
2716 ret
= PTR_ERR(root
);
2719 root_item
= &root
->root_item
;
2721 subvol_info
->treeid
= key
.objectid
;
2723 subvol_info
->generation
= btrfs_root_generation(root_item
);
2724 subvol_info
->flags
= btrfs_root_flags(root_item
);
2726 memcpy(subvol_info
->uuid
, root_item
->uuid
, BTRFS_UUID_SIZE
);
2727 memcpy(subvol_info
->parent_uuid
, root_item
->parent_uuid
,
2729 memcpy(subvol_info
->received_uuid
, root_item
->received_uuid
,
2732 subvol_info
->ctransid
= btrfs_root_ctransid(root_item
);
2733 subvol_info
->ctime
.sec
= btrfs_stack_timespec_sec(&root_item
->ctime
);
2734 subvol_info
->ctime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->ctime
);
2736 subvol_info
->otransid
= btrfs_root_otransid(root_item
);
2737 subvol_info
->otime
.sec
= btrfs_stack_timespec_sec(&root_item
->otime
);
2738 subvol_info
->otime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->otime
);
2740 subvol_info
->stransid
= btrfs_root_stransid(root_item
);
2741 subvol_info
->stime
.sec
= btrfs_stack_timespec_sec(&root_item
->stime
);
2742 subvol_info
->stime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->stime
);
2744 subvol_info
->rtransid
= btrfs_root_rtransid(root_item
);
2745 subvol_info
->rtime
.sec
= btrfs_stack_timespec_sec(&root_item
->rtime
);
2746 subvol_info
->rtime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->rtime
);
2748 if (key
.objectid
!= BTRFS_FS_TREE_OBJECTID
) {
2749 /* Search root tree for ROOT_BACKREF of this subvolume */
2750 key
.type
= BTRFS_ROOT_BACKREF_KEY
;
2752 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
2755 } else if (path
->slots
[0] >=
2756 btrfs_header_nritems(path
->nodes
[0])) {
2757 ret
= btrfs_next_leaf(fs_info
->tree_root
, path
);
2760 } else if (ret
> 0) {
2766 leaf
= path
->nodes
[0];
2767 slot
= path
->slots
[0];
2768 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2769 if (key
.objectid
== subvol_info
->treeid
&&
2770 key
.type
== BTRFS_ROOT_BACKREF_KEY
) {
2771 subvol_info
->parent_id
= key
.offset
;
2773 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2774 subvol_info
->dirid
= btrfs_root_ref_dirid(leaf
, rref
);
2776 item_off
= btrfs_item_ptr_offset(leaf
, slot
)
2777 + sizeof(struct btrfs_root_ref
);
2778 item_len
= btrfs_item_size_nr(leaf
, slot
)
2779 - sizeof(struct btrfs_root_ref
);
2780 read_extent_buffer(leaf
, subvol_info
->name
,
2781 item_off
, item_len
);
2788 if (copy_to_user(argp
, subvol_info
, sizeof(*subvol_info
)))
2792 btrfs_put_root(root
);
2794 btrfs_free_path(path
);
2800 * Return ROOT_REF information of the subvolume containing this inode
2801 * except the subvolume name.
2803 static int btrfs_ioctl_get_subvol_rootref(struct file
*file
, void __user
*argp
)
2805 struct btrfs_ioctl_get_subvol_rootref_args
*rootrefs
;
2806 struct btrfs_root_ref
*rref
;
2807 struct btrfs_root
*root
;
2808 struct btrfs_path
*path
;
2809 struct btrfs_key key
;
2810 struct extent_buffer
*leaf
;
2811 struct inode
*inode
;
2817 path
= btrfs_alloc_path();
2821 rootrefs
= memdup_user(argp
, sizeof(*rootrefs
));
2822 if (IS_ERR(rootrefs
)) {
2823 btrfs_free_path(path
);
2824 return PTR_ERR(rootrefs
);
2827 inode
= file_inode(file
);
2828 root
= BTRFS_I(inode
)->root
->fs_info
->tree_root
;
2829 objectid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2831 key
.objectid
= objectid
;
2832 key
.type
= BTRFS_ROOT_REF_KEY
;
2833 key
.offset
= rootrefs
->min_treeid
;
2836 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2839 } else if (path
->slots
[0] >=
2840 btrfs_header_nritems(path
->nodes
[0])) {
2841 ret
= btrfs_next_leaf(root
, path
);
2844 } else if (ret
> 0) {
2850 leaf
= path
->nodes
[0];
2851 slot
= path
->slots
[0];
2853 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2854 if (key
.objectid
!= objectid
|| key
.type
!= BTRFS_ROOT_REF_KEY
) {
2859 if (found
== BTRFS_MAX_ROOTREF_BUFFER_NUM
) {
2864 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2865 rootrefs
->rootref
[found
].treeid
= key
.offset
;
2866 rootrefs
->rootref
[found
].dirid
=
2867 btrfs_root_ref_dirid(leaf
, rref
);
2870 ret
= btrfs_next_item(root
, path
);
2873 } else if (ret
> 0) {
2880 if (!ret
|| ret
== -EOVERFLOW
) {
2881 rootrefs
->num_items
= found
;
2882 /* update min_treeid for next search */
2884 rootrefs
->min_treeid
=
2885 rootrefs
->rootref
[found
- 1].treeid
+ 1;
2886 if (copy_to_user(argp
, rootrefs
, sizeof(*rootrefs
)))
2891 btrfs_free_path(path
);
2896 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2900 struct dentry
*parent
= file
->f_path
.dentry
;
2901 struct btrfs_fs_info
*fs_info
= btrfs_sb(parent
->d_sb
);
2902 struct dentry
*dentry
;
2903 struct inode
*dir
= d_inode(parent
);
2904 struct inode
*inode
;
2905 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2906 struct btrfs_root
*dest
= NULL
;
2907 struct btrfs_ioctl_vol_args
*vol_args
= NULL
;
2908 struct btrfs_ioctl_vol_args_v2
*vol_args2
= NULL
;
2909 struct user_namespace
*mnt_userns
= file_mnt_user_ns(file
);
2910 char *subvol_name
, *subvol_name_ptr
= NULL
;
2913 bool destroy_parent
= false;
2916 vol_args2
= memdup_user(arg
, sizeof(*vol_args2
));
2917 if (IS_ERR(vol_args2
))
2918 return PTR_ERR(vol_args2
);
2920 if (vol_args2
->flags
& ~BTRFS_SUBVOL_DELETE_ARGS_MASK
) {
2926 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2927 * name, same as v1 currently does.
2929 if (!(vol_args2
->flags
& BTRFS_SUBVOL_SPEC_BY_ID
)) {
2930 vol_args2
->name
[BTRFS_SUBVOL_NAME_MAX
] = 0;
2931 subvol_name
= vol_args2
->name
;
2933 err
= mnt_want_write_file(file
);
2937 struct inode
*old_dir
;
2939 if (vol_args2
->subvolid
< BTRFS_FIRST_FREE_OBJECTID
) {
2944 err
= mnt_want_write_file(file
);
2948 dentry
= btrfs_get_dentry(fs_info
->sb
,
2949 BTRFS_FIRST_FREE_OBJECTID
,
2950 vol_args2
->subvolid
, 0, 0);
2951 if (IS_ERR(dentry
)) {
2952 err
= PTR_ERR(dentry
);
2953 goto out_drop_write
;
2957 * Change the default parent since the subvolume being
2958 * deleted can be outside of the current mount point.
2960 parent
= btrfs_get_parent(dentry
);
2963 * At this point dentry->d_name can point to '/' if the
2964 * subvolume we want to destroy is outsite of the
2965 * current mount point, so we need to release the
2966 * current dentry and execute the lookup to return a new
2967 * one with ->d_name pointing to the
2968 * <mount point>/subvol_name.
2971 if (IS_ERR(parent
)) {
2972 err
= PTR_ERR(parent
);
2973 goto out_drop_write
;
2976 dir
= d_inode(parent
);
2979 * If v2 was used with SPEC_BY_ID, a new parent was
2980 * allocated since the subvolume can be outside of the
2981 * current mount point. Later on we need to release this
2982 * new parent dentry.
2984 destroy_parent
= true;
2987 * On idmapped mounts, deletion via subvolid is
2988 * restricted to subvolumes that are immediate
2989 * ancestors of the inode referenced by the file
2990 * descriptor in the ioctl. Otherwise the idmapping
2991 * could potentially be abused to delete subvolumes
2992 * anywhere in the filesystem the user wouldn't be able
2993 * to delete without an idmapped mount.
2995 if (old_dir
!= dir
&& mnt_userns
!= &init_user_ns
) {
3000 subvol_name_ptr
= btrfs_get_subvol_name_from_objectid(
3001 fs_info
, vol_args2
->subvolid
);
3002 if (IS_ERR(subvol_name_ptr
)) {
3003 err
= PTR_ERR(subvol_name_ptr
);
3006 /* subvol_name_ptr is already nul terminated */
3007 subvol_name
= (char *)kbasename(subvol_name_ptr
);
3010 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3011 if (IS_ERR(vol_args
))
3012 return PTR_ERR(vol_args
);
3014 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = 0;
3015 subvol_name
= vol_args
->name
;
3017 err
= mnt_want_write_file(file
);
3022 subvol_namelen
= strlen(subvol_name
);
3024 if (strchr(subvol_name
, '/') ||
3025 strncmp(subvol_name
, "..", subvol_namelen
) == 0) {
3027 goto free_subvol_name
;
3030 if (!S_ISDIR(dir
->i_mode
)) {
3032 goto free_subvol_name
;
3035 err
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
3037 goto free_subvol_name
;
3038 dentry
= lookup_one(mnt_userns
, subvol_name
, parent
, subvol_namelen
);
3039 if (IS_ERR(dentry
)) {
3040 err
= PTR_ERR(dentry
);
3041 goto out_unlock_dir
;
3044 if (d_really_is_negative(dentry
)) {
3049 inode
= d_inode(dentry
);
3050 dest
= BTRFS_I(inode
)->root
;
3051 if (!capable(CAP_SYS_ADMIN
)) {
3053 * Regular user. Only allow this with a special mount
3054 * option, when the user has write+exec access to the
3055 * subvol root, and when rmdir(2) would have been
3058 * Note that this is _not_ check that the subvol is
3059 * empty or doesn't contain data that we wouldn't
3060 * otherwise be able to delete.
3062 * Users who want to delete empty subvols should try
3066 if (!btrfs_test_opt(fs_info
, USER_SUBVOL_RM_ALLOWED
))
3070 * Do not allow deletion if the parent dir is the same
3071 * as the dir to be deleted. That means the ioctl
3072 * must be called on the dentry referencing the root
3073 * of the subvol, not a random directory contained
3080 err
= inode_permission(mnt_userns
, inode
, MAY_WRITE
| MAY_EXEC
);
3085 /* check if subvolume may be deleted by a user */
3086 err
= btrfs_may_delete(mnt_userns
, dir
, dentry
, 1);
3090 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
3095 btrfs_inode_lock(inode
, 0);
3096 err
= btrfs_delete_subvolume(dir
, dentry
);
3097 btrfs_inode_unlock(inode
, 0);
3099 d_delete_notify(dir
, dentry
);
3104 btrfs_inode_unlock(dir
, 0);
3106 kfree(subvol_name_ptr
);
3111 mnt_drop_write_file(file
);
3118 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
3120 struct inode
*inode
= file_inode(file
);
3121 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3122 struct btrfs_ioctl_defrag_range_args range
= {0};
3125 ret
= mnt_want_write_file(file
);
3129 if (btrfs_root_readonly(root
)) {
3134 /* Subpage defrag will be supported in later commits */
3135 if (root
->fs_info
->sectorsize
< PAGE_SIZE
) {
3140 switch (inode
->i_mode
& S_IFMT
) {
3142 if (!capable(CAP_SYS_ADMIN
)) {
3146 ret
= btrfs_defrag_root(root
);
3150 * Note that this does not check the file descriptor for write
3151 * access. This prevents defragmenting executables that are
3152 * running and allows defrag on files open in read-only mode.
3154 if (!capable(CAP_SYS_ADMIN
) &&
3155 inode_permission(&init_user_ns
, inode
, MAY_WRITE
)) {
3161 if (copy_from_user(&range
, argp
, sizeof(range
))) {
3165 /* compression requires us to start the IO */
3166 if ((range
.flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
3167 range
.flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
3168 range
.extent_thresh
= (u32
)-1;
3171 /* the rest are all set to zero by kzalloc */
3172 range
.len
= (u64
)-1;
3174 ret
= btrfs_defrag_file(file_inode(file
), file
,
3175 &range
, BTRFS_OLDEST_GENERATION
, 0);
3183 mnt_drop_write_file(file
);
3187 static long btrfs_ioctl_add_dev(struct btrfs_fs_info
*fs_info
, void __user
*arg
)
3189 struct btrfs_ioctl_vol_args
*vol_args
;
3192 if (!capable(CAP_SYS_ADMIN
))
3195 if (!btrfs_exclop_start(fs_info
, BTRFS_EXCLOP_DEV_ADD
))
3196 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3198 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3199 if (IS_ERR(vol_args
)) {
3200 ret
= PTR_ERR(vol_args
);
3204 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
3205 ret
= btrfs_init_new_device(fs_info
, vol_args
->name
);
3208 btrfs_info(fs_info
, "disk added %s", vol_args
->name
);
3212 btrfs_exclop_finish(fs_info
);
3216 static long btrfs_ioctl_rm_dev_v2(struct file
*file
, void __user
*arg
)
3218 struct inode
*inode
= file_inode(file
);
3219 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3220 struct btrfs_ioctl_vol_args_v2
*vol_args
;
3221 struct block_device
*bdev
= NULL
;
3224 bool cancel
= false;
3226 if (!capable(CAP_SYS_ADMIN
))
3229 ret
= mnt_want_write_file(file
);
3233 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3234 if (IS_ERR(vol_args
)) {
3235 ret
= PTR_ERR(vol_args
);
3239 if (vol_args
->flags
& ~BTRFS_DEVICE_REMOVE_ARGS_MASK
) {
3243 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
3244 if (!(vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
) &&
3245 strcmp("cancel", vol_args
->name
) == 0)
3248 ret
= exclop_start_or_cancel_reloc(fs_info
, BTRFS_EXCLOP_DEV_REMOVE
,
3252 /* Exclusive operation is now claimed */
3254 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
)
3255 ret
= btrfs_rm_device(fs_info
, NULL
, vol_args
->devid
, &bdev
, &mode
);
3257 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0, &bdev
, &mode
);
3259 btrfs_exclop_finish(fs_info
);
3262 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
)
3263 btrfs_info(fs_info
, "device deleted: id %llu",
3266 btrfs_info(fs_info
, "device deleted: %s",
3272 mnt_drop_write_file(file
);
3274 blkdev_put(bdev
, mode
);
3278 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
3280 struct inode
*inode
= file_inode(file
);
3281 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3282 struct btrfs_ioctl_vol_args
*vol_args
;
3283 struct block_device
*bdev
= NULL
;
3288 if (!capable(CAP_SYS_ADMIN
))
3291 ret
= mnt_want_write_file(file
);
3295 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3296 if (IS_ERR(vol_args
)) {
3297 ret
= PTR_ERR(vol_args
);
3298 goto out_drop_write
;
3300 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
3301 cancel
= (strcmp("cancel", vol_args
->name
) == 0);
3303 ret
= exclop_start_or_cancel_reloc(fs_info
, BTRFS_EXCLOP_DEV_REMOVE
,
3306 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0, &bdev
, &mode
);
3308 btrfs_info(fs_info
, "disk deleted %s", vol_args
->name
);
3309 btrfs_exclop_finish(fs_info
);
3314 mnt_drop_write_file(file
);
3316 blkdev_put(bdev
, mode
);
3320 static long btrfs_ioctl_fs_info(struct btrfs_fs_info
*fs_info
,
3323 struct btrfs_ioctl_fs_info_args
*fi_args
;
3324 struct btrfs_device
*device
;
3325 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
3329 fi_args
= memdup_user(arg
, sizeof(*fi_args
));
3330 if (IS_ERR(fi_args
))
3331 return PTR_ERR(fi_args
);
3333 flags_in
= fi_args
->flags
;
3334 memset(fi_args
, 0, sizeof(*fi_args
));
3337 fi_args
->num_devices
= fs_devices
->num_devices
;
3339 list_for_each_entry_rcu(device
, &fs_devices
->devices
, dev_list
) {
3340 if (device
->devid
> fi_args
->max_id
)
3341 fi_args
->max_id
= device
->devid
;
3345 memcpy(&fi_args
->fsid
, fs_devices
->fsid
, sizeof(fi_args
->fsid
));
3346 fi_args
->nodesize
= fs_info
->nodesize
;
3347 fi_args
->sectorsize
= fs_info
->sectorsize
;
3348 fi_args
->clone_alignment
= fs_info
->sectorsize
;
3350 if (flags_in
& BTRFS_FS_INFO_FLAG_CSUM_INFO
) {
3351 fi_args
->csum_type
= btrfs_super_csum_type(fs_info
->super_copy
);
3352 fi_args
->csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
3353 fi_args
->flags
|= BTRFS_FS_INFO_FLAG_CSUM_INFO
;
3356 if (flags_in
& BTRFS_FS_INFO_FLAG_GENERATION
) {
3357 fi_args
->generation
= fs_info
->generation
;
3358 fi_args
->flags
|= BTRFS_FS_INFO_FLAG_GENERATION
;
3361 if (flags_in
& BTRFS_FS_INFO_FLAG_METADATA_UUID
) {
3362 memcpy(&fi_args
->metadata_uuid
, fs_devices
->metadata_uuid
,
3363 sizeof(fi_args
->metadata_uuid
));
3364 fi_args
->flags
|= BTRFS_FS_INFO_FLAG_METADATA_UUID
;
3367 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
3374 static long btrfs_ioctl_dev_info(struct btrfs_fs_info
*fs_info
,
3377 struct btrfs_ioctl_dev_info_args
*di_args
;
3378 struct btrfs_device
*dev
;
3380 char *s_uuid
= NULL
;
3382 di_args
= memdup_user(arg
, sizeof(*di_args
));
3383 if (IS_ERR(di_args
))
3384 return PTR_ERR(di_args
);
3386 if (!btrfs_is_empty_uuid(di_args
->uuid
))
3387 s_uuid
= di_args
->uuid
;
3390 dev
= btrfs_find_device(fs_info
->fs_devices
, di_args
->devid
, s_uuid
,
3398 di_args
->devid
= dev
->devid
;
3399 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
3400 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
3401 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
3403 strncpy(di_args
->path
, rcu_str_deref(dev
->name
),
3404 sizeof(di_args
->path
) - 1);
3405 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
3407 di_args
->path
[0] = '\0';
3412 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
3419 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3421 struct inode
*inode
= file_inode(file
);
3422 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3423 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3424 struct btrfs_root
*new_root
;
3425 struct btrfs_dir_item
*di
;
3426 struct btrfs_trans_handle
*trans
;
3427 struct btrfs_path
*path
= NULL
;
3428 struct btrfs_disk_key disk_key
;
3433 if (!capable(CAP_SYS_ADMIN
))
3436 ret
= mnt_want_write_file(file
);
3440 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3446 objectid
= BTRFS_FS_TREE_OBJECTID
;
3448 new_root
= btrfs_get_fs_root(fs_info
, objectid
, true);
3449 if (IS_ERR(new_root
)) {
3450 ret
= PTR_ERR(new_root
);
3453 if (!is_fstree(new_root
->root_key
.objectid
)) {
3458 path
= btrfs_alloc_path();
3464 trans
= btrfs_start_transaction(root
, 1);
3465 if (IS_ERR(trans
)) {
3466 ret
= PTR_ERR(trans
);
3470 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
3471 di
= btrfs_lookup_dir_item(trans
, fs_info
->tree_root
, path
,
3472 dir_id
, "default", 7, 1);
3473 if (IS_ERR_OR_NULL(di
)) {
3474 btrfs_release_path(path
);
3475 btrfs_end_transaction(trans
);
3477 "Umm, you don't have the default diritem, this isn't going to work");
3482 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3483 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3484 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3485 btrfs_release_path(path
);
3487 btrfs_set_fs_incompat(fs_info
, DEFAULT_SUBVOL
);
3488 btrfs_end_transaction(trans
);
3490 btrfs_put_root(new_root
);
3491 btrfs_free_path(path
);
3493 mnt_drop_write_file(file
);
3497 static void get_block_group_info(struct list_head
*groups_list
,
3498 struct btrfs_ioctl_space_info
*space
)
3500 struct btrfs_block_group
*block_group
;
3502 space
->total_bytes
= 0;
3503 space
->used_bytes
= 0;
3505 list_for_each_entry(block_group
, groups_list
, list
) {
3506 space
->flags
= block_group
->flags
;
3507 space
->total_bytes
+= block_group
->length
;
3508 space
->used_bytes
+= block_group
->used
;
3512 static long btrfs_ioctl_space_info(struct btrfs_fs_info
*fs_info
,
3515 struct btrfs_ioctl_space_args space_args
;
3516 struct btrfs_ioctl_space_info space
;
3517 struct btrfs_ioctl_space_info
*dest
;
3518 struct btrfs_ioctl_space_info
*dest_orig
;
3519 struct btrfs_ioctl_space_info __user
*user_dest
;
3520 struct btrfs_space_info
*info
;
3521 static const u64 types
[] = {
3522 BTRFS_BLOCK_GROUP_DATA
,
3523 BTRFS_BLOCK_GROUP_SYSTEM
,
3524 BTRFS_BLOCK_GROUP_METADATA
,
3525 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
3533 if (copy_from_user(&space_args
,
3534 (struct btrfs_ioctl_space_args __user
*)arg
,
3535 sizeof(space_args
)))
3538 for (i
= 0; i
< num_types
; i
++) {
3539 struct btrfs_space_info
*tmp
;
3542 list_for_each_entry(tmp
, &fs_info
->space_info
, list
) {
3543 if (tmp
->flags
== types
[i
]) {
3552 down_read(&info
->groups_sem
);
3553 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3554 if (!list_empty(&info
->block_groups
[c
]))
3557 up_read(&info
->groups_sem
);
3561 * Global block reserve, exported as a space_info
3565 /* space_slots == 0 means they are asking for a count */
3566 if (space_args
.space_slots
== 0) {
3567 space_args
.total_spaces
= slot_count
;
3571 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
3573 alloc_size
= sizeof(*dest
) * slot_count
;
3575 /* we generally have at most 6 or so space infos, one for each raid
3576 * level. So, a whole page should be more than enough for everyone
3578 if (alloc_size
> PAGE_SIZE
)
3581 space_args
.total_spaces
= 0;
3582 dest
= kmalloc(alloc_size
, GFP_KERNEL
);
3587 /* now we have a buffer to copy into */
3588 for (i
= 0; i
< num_types
; i
++) {
3589 struct btrfs_space_info
*tmp
;
3595 list_for_each_entry(tmp
, &fs_info
->space_info
, list
) {
3596 if (tmp
->flags
== types
[i
]) {
3604 down_read(&info
->groups_sem
);
3605 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3606 if (!list_empty(&info
->block_groups
[c
])) {
3607 get_block_group_info(&info
->block_groups
[c
],
3609 memcpy(dest
, &space
, sizeof(space
));
3611 space_args
.total_spaces
++;
3617 up_read(&info
->groups_sem
);
3621 * Add global block reserve
3624 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
3626 spin_lock(&block_rsv
->lock
);
3627 space
.total_bytes
= block_rsv
->size
;
3628 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
3629 spin_unlock(&block_rsv
->lock
);
3630 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
3631 memcpy(dest
, &space
, sizeof(space
));
3632 space_args
.total_spaces
++;
3635 user_dest
= (struct btrfs_ioctl_space_info __user
*)
3636 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
3638 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
3643 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
3649 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
3652 struct btrfs_trans_handle
*trans
;
3656 trans
= btrfs_attach_transaction_barrier(root
);
3657 if (IS_ERR(trans
)) {
3658 if (PTR_ERR(trans
) != -ENOENT
)
3659 return PTR_ERR(trans
);
3661 /* No running transaction, don't bother */
3662 transid
= root
->fs_info
->last_trans_committed
;
3665 transid
= trans
->transid
;
3666 ret
= btrfs_commit_transaction_async(trans
);
3668 btrfs_end_transaction(trans
);
3673 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
3678 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_fs_info
*fs_info
,
3684 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
3687 transid
= 0; /* current trans */
3689 return btrfs_wait_for_commit(fs_info
, transid
);
3692 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
3694 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
3695 struct btrfs_ioctl_scrub_args
*sa
;
3698 if (!capable(CAP_SYS_ADMIN
))
3701 sa
= memdup_user(arg
, sizeof(*sa
));
3705 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
3706 ret
= mnt_want_write_file(file
);
3711 ret
= btrfs_scrub_dev(fs_info
, sa
->devid
, sa
->start
, sa
->end
,
3712 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
3716 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3717 * error. This is important as it allows user space to know how much
3718 * progress scrub has done. For example, if scrub is canceled we get
3719 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3720 * space. Later user space can inspect the progress from the structure
3721 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3722 * previously (btrfs-progs does this).
3723 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3724 * then return -EFAULT to signal the structure was not copied or it may
3725 * be corrupt and unreliable due to a partial copy.
3727 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3730 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
3731 mnt_drop_write_file(file
);
3737 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info
*fs_info
)
3739 if (!capable(CAP_SYS_ADMIN
))
3742 return btrfs_scrub_cancel(fs_info
);
3745 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info
*fs_info
,
3748 struct btrfs_ioctl_scrub_args
*sa
;
3751 if (!capable(CAP_SYS_ADMIN
))
3754 sa
= memdup_user(arg
, sizeof(*sa
));
3758 ret
= btrfs_scrub_progress(fs_info
, sa
->devid
, &sa
->progress
);
3760 if (ret
== 0 && copy_to_user(arg
, sa
, sizeof(*sa
)))
3767 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info
*fs_info
,
3770 struct btrfs_ioctl_get_dev_stats
*sa
;
3773 sa
= memdup_user(arg
, sizeof(*sa
));
3777 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
3782 ret
= btrfs_get_dev_stats(fs_info
, sa
);
3784 if (ret
== 0 && copy_to_user(arg
, sa
, sizeof(*sa
)))
3791 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info
*fs_info
,
3794 struct btrfs_ioctl_dev_replace_args
*p
;
3797 if (!capable(CAP_SYS_ADMIN
))
3800 p
= memdup_user(arg
, sizeof(*p
));
3805 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
3806 if (sb_rdonly(fs_info
->sb
)) {
3810 if (!btrfs_exclop_start(fs_info
, BTRFS_EXCLOP_DEV_REPLACE
)) {
3811 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3813 ret
= btrfs_dev_replace_by_ioctl(fs_info
, p
);
3814 btrfs_exclop_finish(fs_info
);
3817 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
3818 btrfs_dev_replace_status(fs_info
, p
);
3821 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
3822 p
->result
= btrfs_dev_replace_cancel(fs_info
);
3830 if ((ret
== 0 || ret
== -ECANCELED
) && copy_to_user(arg
, p
, sizeof(*p
)))
3837 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
3843 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
3844 struct inode_fs_paths
*ipath
= NULL
;
3845 struct btrfs_path
*path
;
3847 if (!capable(CAP_DAC_READ_SEARCH
))
3850 path
= btrfs_alloc_path();
3856 ipa
= memdup_user(arg
, sizeof(*ipa
));
3863 size
= min_t(u32
, ipa
->size
, 4096);
3864 ipath
= init_ipath(size
, root
, path
);
3865 if (IS_ERR(ipath
)) {
3866 ret
= PTR_ERR(ipath
);
3871 ret
= paths_from_inode(ipa
->inum
, ipath
);
3875 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
3876 rel_ptr
= ipath
->fspath
->val
[i
] -
3877 (u64
)(unsigned long)ipath
->fspath
->val
;
3878 ipath
->fspath
->val
[i
] = rel_ptr
;
3881 ret
= copy_to_user((void __user
*)(unsigned long)ipa
->fspath
,
3882 ipath
->fspath
, size
);
3889 btrfs_free_path(path
);
3896 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
3898 struct btrfs_data_container
*inodes
= ctx
;
3899 const size_t c
= 3 * sizeof(u64
);
3901 if (inodes
->bytes_left
>= c
) {
3902 inodes
->bytes_left
-= c
;
3903 inodes
->val
[inodes
->elem_cnt
] = inum
;
3904 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
3905 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
3906 inodes
->elem_cnt
+= 3;
3908 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
3909 inodes
->bytes_left
= 0;
3910 inodes
->elem_missed
+= 3;
3916 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info
*fs_info
,
3917 void __user
*arg
, int version
)
3921 struct btrfs_ioctl_logical_ino_args
*loi
;
3922 struct btrfs_data_container
*inodes
= NULL
;
3923 struct btrfs_path
*path
= NULL
;
3926 if (!capable(CAP_SYS_ADMIN
))
3929 loi
= memdup_user(arg
, sizeof(*loi
));
3931 return PTR_ERR(loi
);
3934 ignore_offset
= false;
3935 size
= min_t(u32
, loi
->size
, SZ_64K
);
3937 /* All reserved bits must be 0 for now */
3938 if (memchr_inv(loi
->reserved
, 0, sizeof(loi
->reserved
))) {
3942 /* Only accept flags we have defined so far */
3943 if (loi
->flags
& ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET
)) {
3947 ignore_offset
= loi
->flags
& BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET
;
3948 size
= min_t(u32
, loi
->size
, SZ_16M
);
3951 path
= btrfs_alloc_path();
3957 inodes
= init_data_container(size
);
3958 if (IS_ERR(inodes
)) {
3959 ret
= PTR_ERR(inodes
);
3964 ret
= iterate_inodes_from_logical(loi
->logical
, fs_info
, path
,
3965 build_ino_list
, inodes
, ignore_offset
);
3971 ret
= copy_to_user((void __user
*)(unsigned long)loi
->inodes
, inodes
,
3977 btrfs_free_path(path
);
3985 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
,
3986 struct btrfs_ioctl_balance_args
*bargs
)
3988 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3990 bargs
->flags
= bctl
->flags
;
3992 if (test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
))
3993 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
3994 if (atomic_read(&fs_info
->balance_pause_req
))
3995 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
3996 if (atomic_read(&fs_info
->balance_cancel_req
))
3997 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
3999 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
4000 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
4001 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
4003 spin_lock(&fs_info
->balance_lock
);
4004 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4005 spin_unlock(&fs_info
->balance_lock
);
4008 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
4010 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4011 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4012 struct btrfs_ioctl_balance_args
*bargs
;
4013 struct btrfs_balance_control
*bctl
;
4014 bool need_unlock
; /* for mut. excl. ops lock */
4017 if (!capable(CAP_SYS_ADMIN
))
4020 ret
= mnt_want_write_file(file
);
4025 if (btrfs_exclop_start(fs_info
, BTRFS_EXCLOP_BALANCE
)) {
4026 mutex_lock(&fs_info
->balance_mutex
);
4032 * mut. excl. ops lock is locked. Three possibilities:
4033 * (1) some other op is running
4034 * (2) balance is running
4035 * (3) balance is paused -- special case (think resume)
4037 mutex_lock(&fs_info
->balance_mutex
);
4038 if (fs_info
->balance_ctl
) {
4039 /* this is either (2) or (3) */
4040 if (!test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
4041 mutex_unlock(&fs_info
->balance_mutex
);
4043 * Lock released to allow other waiters to continue,
4044 * we'll reexamine the status again.
4046 mutex_lock(&fs_info
->balance_mutex
);
4048 if (fs_info
->balance_ctl
&&
4049 !test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
4051 need_unlock
= false;
4055 mutex_unlock(&fs_info
->balance_mutex
);
4059 mutex_unlock(&fs_info
->balance_mutex
);
4065 mutex_unlock(&fs_info
->balance_mutex
);
4066 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4073 bargs
= memdup_user(arg
, sizeof(*bargs
));
4074 if (IS_ERR(bargs
)) {
4075 ret
= PTR_ERR(bargs
);
4079 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
4080 if (!fs_info
->balance_ctl
) {
4085 bctl
= fs_info
->balance_ctl
;
4086 spin_lock(&fs_info
->balance_lock
);
4087 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4088 spin_unlock(&fs_info
->balance_lock
);
4096 if (fs_info
->balance_ctl
) {
4101 bctl
= kzalloc(sizeof(*bctl
), GFP_KERNEL
);
4108 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4109 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4110 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4112 bctl
->flags
= bargs
->flags
;
4114 /* balance everything - no filters */
4115 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4118 if (bctl
->flags
& ~(BTRFS_BALANCE_ARGS_MASK
| BTRFS_BALANCE_TYPE_MASK
)) {
4125 * Ownership of bctl and exclusive operation goes to btrfs_balance.
4126 * bctl is freed in reset_balance_state, or, if restriper was paused
4127 * all the way until unmount, in free_fs_info. The flag should be
4128 * cleared after reset_balance_state.
4130 need_unlock
= false;
4132 ret
= btrfs_balance(fs_info
, bctl
, bargs
);
4135 if ((ret
== 0 || ret
== -ECANCELED
) && arg
) {
4136 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4145 mutex_unlock(&fs_info
->balance_mutex
);
4147 btrfs_exclop_finish(fs_info
);
4149 mnt_drop_write_file(file
);
4153 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info
*fs_info
, int cmd
)
4155 if (!capable(CAP_SYS_ADMIN
))
4159 case BTRFS_BALANCE_CTL_PAUSE
:
4160 return btrfs_pause_balance(fs_info
);
4161 case BTRFS_BALANCE_CTL_CANCEL
:
4162 return btrfs_cancel_balance(fs_info
);
4168 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info
*fs_info
,
4171 struct btrfs_ioctl_balance_args
*bargs
;
4174 if (!capable(CAP_SYS_ADMIN
))
4177 mutex_lock(&fs_info
->balance_mutex
);
4178 if (!fs_info
->balance_ctl
) {
4183 bargs
= kzalloc(sizeof(*bargs
), GFP_KERNEL
);
4189 btrfs_update_ioctl_balance_args(fs_info
, bargs
);
4191 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4196 mutex_unlock(&fs_info
->balance_mutex
);
4200 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4202 struct inode
*inode
= file_inode(file
);
4203 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4204 struct btrfs_ioctl_quota_ctl_args
*sa
;
4207 if (!capable(CAP_SYS_ADMIN
))
4210 ret
= mnt_want_write_file(file
);
4214 sa
= memdup_user(arg
, sizeof(*sa
));
4220 down_write(&fs_info
->subvol_sem
);
4223 case BTRFS_QUOTA_CTL_ENABLE
:
4224 ret
= btrfs_quota_enable(fs_info
);
4226 case BTRFS_QUOTA_CTL_DISABLE
:
4227 ret
= btrfs_quota_disable(fs_info
);
4235 up_write(&fs_info
->subvol_sem
);
4237 mnt_drop_write_file(file
);
4241 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4243 struct inode
*inode
= file_inode(file
);
4244 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4245 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4246 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4247 struct btrfs_trans_handle
*trans
;
4251 if (!capable(CAP_SYS_ADMIN
))
4254 ret
= mnt_want_write_file(file
);
4258 sa
= memdup_user(arg
, sizeof(*sa
));
4264 trans
= btrfs_join_transaction(root
);
4265 if (IS_ERR(trans
)) {
4266 ret
= PTR_ERR(trans
);
4271 ret
= btrfs_add_qgroup_relation(trans
, sa
->src
, sa
->dst
);
4273 ret
= btrfs_del_qgroup_relation(trans
, sa
->src
, sa
->dst
);
4276 /* update qgroup status and info */
4277 err
= btrfs_run_qgroups(trans
);
4279 btrfs_handle_fs_error(fs_info
, err
,
4280 "failed to update qgroup status and info");
4281 err
= btrfs_end_transaction(trans
);
4288 mnt_drop_write_file(file
);
4292 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4294 struct inode
*inode
= file_inode(file
);
4295 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4296 struct btrfs_ioctl_qgroup_create_args
*sa
;
4297 struct btrfs_trans_handle
*trans
;
4301 if (!capable(CAP_SYS_ADMIN
))
4304 ret
= mnt_want_write_file(file
);
4308 sa
= memdup_user(arg
, sizeof(*sa
));
4314 if (!sa
->qgroupid
) {
4319 trans
= btrfs_join_transaction(root
);
4320 if (IS_ERR(trans
)) {
4321 ret
= PTR_ERR(trans
);
4326 ret
= btrfs_create_qgroup(trans
, sa
->qgroupid
);
4328 ret
= btrfs_remove_qgroup(trans
, sa
->qgroupid
);
4331 err
= btrfs_end_transaction(trans
);
4338 mnt_drop_write_file(file
);
4342 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4344 struct inode
*inode
= file_inode(file
);
4345 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4346 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4347 struct btrfs_trans_handle
*trans
;
4352 if (!capable(CAP_SYS_ADMIN
))
4355 ret
= mnt_want_write_file(file
);
4359 sa
= memdup_user(arg
, sizeof(*sa
));
4365 trans
= btrfs_join_transaction(root
);
4366 if (IS_ERR(trans
)) {
4367 ret
= PTR_ERR(trans
);
4371 qgroupid
= sa
->qgroupid
;
4373 /* take the current subvol as qgroup */
4374 qgroupid
= root
->root_key
.objectid
;
4377 ret
= btrfs_limit_qgroup(trans
, qgroupid
, &sa
->lim
);
4379 err
= btrfs_end_transaction(trans
);
4386 mnt_drop_write_file(file
);
4390 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4392 struct inode
*inode
= file_inode(file
);
4393 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4394 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4397 if (!capable(CAP_SYS_ADMIN
))
4400 ret
= mnt_want_write_file(file
);
4404 qsa
= memdup_user(arg
, sizeof(*qsa
));
4415 ret
= btrfs_qgroup_rescan(fs_info
);
4420 mnt_drop_write_file(file
);
4424 static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info
*fs_info
,
4427 struct btrfs_ioctl_quota_rescan_args qsa
= {0};
4430 if (!capable(CAP_SYS_ADMIN
))
4433 if (fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4435 qsa
.progress
= fs_info
->qgroup_rescan_progress
.objectid
;
4438 if (copy_to_user(arg
, &qsa
, sizeof(qsa
)))
4444 static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info
*fs_info
,
4447 if (!capable(CAP_SYS_ADMIN
))
4450 return btrfs_qgroup_wait_for_completion(fs_info
, true);
4453 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
4454 struct user_namespace
*mnt_userns
,
4455 struct btrfs_ioctl_received_subvol_args
*sa
)
4457 struct inode
*inode
= file_inode(file
);
4458 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4459 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4460 struct btrfs_root_item
*root_item
= &root
->root_item
;
4461 struct btrfs_trans_handle
*trans
;
4462 struct timespec64 ct
= current_time(inode
);
4464 int received_uuid_changed
;
4466 if (!inode_owner_or_capable(mnt_userns
, inode
))
4469 ret
= mnt_want_write_file(file
);
4473 down_write(&fs_info
->subvol_sem
);
4475 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
4480 if (btrfs_root_readonly(root
)) {
4487 * 2 - uuid items (received uuid + subvol uuid)
4489 trans
= btrfs_start_transaction(root
, 3);
4490 if (IS_ERR(trans
)) {
4491 ret
= PTR_ERR(trans
);
4496 sa
->rtransid
= trans
->transid
;
4497 sa
->rtime
.sec
= ct
.tv_sec
;
4498 sa
->rtime
.nsec
= ct
.tv_nsec
;
4500 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4502 if (received_uuid_changed
&&
4503 !btrfs_is_empty_uuid(root_item
->received_uuid
)) {
4504 ret
= btrfs_uuid_tree_remove(trans
, root_item
->received_uuid
,
4505 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4506 root
->root_key
.objectid
);
4507 if (ret
&& ret
!= -ENOENT
) {
4508 btrfs_abort_transaction(trans
, ret
);
4509 btrfs_end_transaction(trans
);
4513 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4514 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4515 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4516 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4517 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4518 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4519 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
4521 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
4522 &root
->root_key
, &root
->root_item
);
4524 btrfs_end_transaction(trans
);
4527 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
4528 ret
= btrfs_uuid_tree_add(trans
, sa
->uuid
,
4529 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4530 root
->root_key
.objectid
);
4531 if (ret
< 0 && ret
!= -EEXIST
) {
4532 btrfs_abort_transaction(trans
, ret
);
4533 btrfs_end_transaction(trans
);
4537 ret
= btrfs_commit_transaction(trans
);
4539 up_write(&fs_info
->subvol_sem
);
4540 mnt_drop_write_file(file
);
4545 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
4548 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
4549 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
4552 args32
= memdup_user(arg
, sizeof(*args32
));
4554 return PTR_ERR(args32
);
4556 args64
= kmalloc(sizeof(*args64
), GFP_KERNEL
);
4562 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
4563 args64
->stransid
= args32
->stransid
;
4564 args64
->rtransid
= args32
->rtransid
;
4565 args64
->stime
.sec
= args32
->stime
.sec
;
4566 args64
->stime
.nsec
= args32
->stime
.nsec
;
4567 args64
->rtime
.sec
= args32
->rtime
.sec
;
4568 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
4569 args64
->flags
= args32
->flags
;
4571 ret
= _btrfs_ioctl_set_received_subvol(file
, file_mnt_user_ns(file
), args64
);
4575 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
4576 args32
->stransid
= args64
->stransid
;
4577 args32
->rtransid
= args64
->rtransid
;
4578 args32
->stime
.sec
= args64
->stime
.sec
;
4579 args32
->stime
.nsec
= args64
->stime
.nsec
;
4580 args32
->rtime
.sec
= args64
->rtime
.sec
;
4581 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
4582 args32
->flags
= args64
->flags
;
4584 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
4595 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
4598 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
4601 sa
= memdup_user(arg
, sizeof(*sa
));
4605 ret
= _btrfs_ioctl_set_received_subvol(file
, file_mnt_user_ns(file
), sa
);
4610 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
4619 static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info
*fs_info
,
4624 char label
[BTRFS_LABEL_SIZE
];
4626 spin_lock(&fs_info
->super_lock
);
4627 memcpy(label
, fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
4628 spin_unlock(&fs_info
->super_lock
);
4630 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
4632 if (len
== BTRFS_LABEL_SIZE
) {
4634 "label is too long, return the first %zu bytes",
4638 ret
= copy_to_user(arg
, label
, len
);
4640 return ret
? -EFAULT
: 0;
4643 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
4645 struct inode
*inode
= file_inode(file
);
4646 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4647 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4648 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
4649 struct btrfs_trans_handle
*trans
;
4650 char label
[BTRFS_LABEL_SIZE
];
4653 if (!capable(CAP_SYS_ADMIN
))
4656 if (copy_from_user(label
, arg
, sizeof(label
)))
4659 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
4661 "unable to set label with more than %d bytes",
4662 BTRFS_LABEL_SIZE
- 1);
4666 ret
= mnt_want_write_file(file
);
4670 trans
= btrfs_start_transaction(root
, 0);
4671 if (IS_ERR(trans
)) {
4672 ret
= PTR_ERR(trans
);
4676 spin_lock(&fs_info
->super_lock
);
4677 strcpy(super_block
->label
, label
);
4678 spin_unlock(&fs_info
->super_lock
);
4679 ret
= btrfs_commit_transaction(trans
);
4682 mnt_drop_write_file(file
);
4686 #define INIT_FEATURE_FLAGS(suffix) \
4687 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4688 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4689 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4691 int btrfs_ioctl_get_supported_features(void __user
*arg
)
4693 static const struct btrfs_ioctl_feature_flags features
[3] = {
4694 INIT_FEATURE_FLAGS(SUPP
),
4695 INIT_FEATURE_FLAGS(SAFE_SET
),
4696 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
4699 if (copy_to_user(arg
, &features
, sizeof(features
)))
4705 static int btrfs_ioctl_get_features(struct btrfs_fs_info
*fs_info
,
4708 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
4709 struct btrfs_ioctl_feature_flags features
;
4711 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
4712 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
4713 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
4715 if (copy_to_user(arg
, &features
, sizeof(features
)))
4721 static int check_feature_bits(struct btrfs_fs_info
*fs_info
,
4722 enum btrfs_feature_set set
,
4723 u64 change_mask
, u64 flags
, u64 supported_flags
,
4724 u64 safe_set
, u64 safe_clear
)
4726 const char *type
= btrfs_feature_set_name(set
);
4728 u64 disallowed
, unsupported
;
4729 u64 set_mask
= flags
& change_mask
;
4730 u64 clear_mask
= ~flags
& change_mask
;
4732 unsupported
= set_mask
& ~supported_flags
;
4734 names
= btrfs_printable_features(set
, unsupported
);
4737 "this kernel does not support the %s feature bit%s",
4738 names
, strchr(names
, ',') ? "s" : "");
4742 "this kernel does not support %s bits 0x%llx",
4747 disallowed
= set_mask
& ~safe_set
;
4749 names
= btrfs_printable_features(set
, disallowed
);
4752 "can't set the %s feature bit%s while mounted",
4753 names
, strchr(names
, ',') ? "s" : "");
4757 "can't set %s bits 0x%llx while mounted",
4762 disallowed
= clear_mask
& ~safe_clear
;
4764 names
= btrfs_printable_features(set
, disallowed
);
4767 "can't clear the %s feature bit%s while mounted",
4768 names
, strchr(names
, ',') ? "s" : "");
4772 "can't clear %s bits 0x%llx while mounted",
4780 #define check_feature(fs_info, change_mask, flags, mask_base) \
4781 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4782 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4783 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4784 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4786 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
4788 struct inode
*inode
= file_inode(file
);
4789 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4790 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4791 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
4792 struct btrfs_ioctl_feature_flags flags
[2];
4793 struct btrfs_trans_handle
*trans
;
4797 if (!capable(CAP_SYS_ADMIN
))
4800 if (copy_from_user(flags
, arg
, sizeof(flags
)))
4804 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
4805 !flags
[0].incompat_flags
)
4808 ret
= check_feature(fs_info
, flags
[0].compat_flags
,
4809 flags
[1].compat_flags
, COMPAT
);
4813 ret
= check_feature(fs_info
, flags
[0].compat_ro_flags
,
4814 flags
[1].compat_ro_flags
, COMPAT_RO
);
4818 ret
= check_feature(fs_info
, flags
[0].incompat_flags
,
4819 flags
[1].incompat_flags
, INCOMPAT
);
4823 ret
= mnt_want_write_file(file
);
4827 trans
= btrfs_start_transaction(root
, 0);
4828 if (IS_ERR(trans
)) {
4829 ret
= PTR_ERR(trans
);
4830 goto out_drop_write
;
4833 spin_lock(&fs_info
->super_lock
);
4834 newflags
= btrfs_super_compat_flags(super_block
);
4835 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
4836 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
4837 btrfs_set_super_compat_flags(super_block
, newflags
);
4839 newflags
= btrfs_super_compat_ro_flags(super_block
);
4840 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
4841 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
4842 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
4844 newflags
= btrfs_super_incompat_flags(super_block
);
4845 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
4846 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
4847 btrfs_set_super_incompat_flags(super_block
, newflags
);
4848 spin_unlock(&fs_info
->super_lock
);
4850 ret
= btrfs_commit_transaction(trans
);
4852 mnt_drop_write_file(file
);
4857 static int _btrfs_ioctl_send(struct file
*file
, void __user
*argp
, bool compat
)
4859 struct btrfs_ioctl_send_args
*arg
;
4863 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4864 struct btrfs_ioctl_send_args_32 args32
;
4866 ret
= copy_from_user(&args32
, argp
, sizeof(args32
));
4869 arg
= kzalloc(sizeof(*arg
), GFP_KERNEL
);
4872 arg
->send_fd
= args32
.send_fd
;
4873 arg
->clone_sources_count
= args32
.clone_sources_count
;
4874 arg
->clone_sources
= compat_ptr(args32
.clone_sources
);
4875 arg
->parent_root
= args32
.parent_root
;
4876 arg
->flags
= args32
.flags
;
4877 memcpy(arg
->reserved
, args32
.reserved
,
4878 sizeof(args32
.reserved
));
4883 arg
= memdup_user(argp
, sizeof(*arg
));
4885 return PTR_ERR(arg
);
4887 ret
= btrfs_ioctl_send(file
, arg
);
4892 long btrfs_ioctl(struct file
*file
, unsigned int
4893 cmd
, unsigned long arg
)
4895 struct inode
*inode
= file_inode(file
);
4896 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4897 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4898 void __user
*argp
= (void __user
*)arg
;
4901 case FS_IOC_GETVERSION
:
4902 return btrfs_ioctl_getversion(file
, argp
);
4903 case FS_IOC_GETFSLABEL
:
4904 return btrfs_ioctl_get_fslabel(fs_info
, argp
);
4905 case FS_IOC_SETFSLABEL
:
4906 return btrfs_ioctl_set_fslabel(file
, argp
);
4908 return btrfs_ioctl_fitrim(fs_info
, argp
);
4909 case BTRFS_IOC_SNAP_CREATE
:
4910 return btrfs_ioctl_snap_create(file
, argp
, 0);
4911 case BTRFS_IOC_SNAP_CREATE_V2
:
4912 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
4913 case BTRFS_IOC_SUBVOL_CREATE
:
4914 return btrfs_ioctl_snap_create(file
, argp
, 1);
4915 case BTRFS_IOC_SUBVOL_CREATE_V2
:
4916 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
4917 case BTRFS_IOC_SNAP_DESTROY
:
4918 return btrfs_ioctl_snap_destroy(file
, argp
, false);
4919 case BTRFS_IOC_SNAP_DESTROY_V2
:
4920 return btrfs_ioctl_snap_destroy(file
, argp
, true);
4921 case BTRFS_IOC_SUBVOL_GETFLAGS
:
4922 return btrfs_ioctl_subvol_getflags(file
, argp
);
4923 case BTRFS_IOC_SUBVOL_SETFLAGS
:
4924 return btrfs_ioctl_subvol_setflags(file
, argp
);
4925 case BTRFS_IOC_DEFAULT_SUBVOL
:
4926 return btrfs_ioctl_default_subvol(file
, argp
);
4927 case BTRFS_IOC_DEFRAG
:
4928 return btrfs_ioctl_defrag(file
, NULL
);
4929 case BTRFS_IOC_DEFRAG_RANGE
:
4930 return btrfs_ioctl_defrag(file
, argp
);
4931 case BTRFS_IOC_RESIZE
:
4932 return btrfs_ioctl_resize(file
, argp
);
4933 case BTRFS_IOC_ADD_DEV
:
4934 return btrfs_ioctl_add_dev(fs_info
, argp
);
4935 case BTRFS_IOC_RM_DEV
:
4936 return btrfs_ioctl_rm_dev(file
, argp
);
4937 case BTRFS_IOC_RM_DEV_V2
:
4938 return btrfs_ioctl_rm_dev_v2(file
, argp
);
4939 case BTRFS_IOC_FS_INFO
:
4940 return btrfs_ioctl_fs_info(fs_info
, argp
);
4941 case BTRFS_IOC_DEV_INFO
:
4942 return btrfs_ioctl_dev_info(fs_info
, argp
);
4943 case BTRFS_IOC_BALANCE
:
4944 return btrfs_ioctl_balance(file
, NULL
);
4945 case BTRFS_IOC_TREE_SEARCH
:
4946 return btrfs_ioctl_tree_search(file
, argp
);
4947 case BTRFS_IOC_TREE_SEARCH_V2
:
4948 return btrfs_ioctl_tree_search_v2(file
, argp
);
4949 case BTRFS_IOC_INO_LOOKUP
:
4950 return btrfs_ioctl_ino_lookup(file
, argp
);
4951 case BTRFS_IOC_INO_PATHS
:
4952 return btrfs_ioctl_ino_to_path(root
, argp
);
4953 case BTRFS_IOC_LOGICAL_INO
:
4954 return btrfs_ioctl_logical_to_ino(fs_info
, argp
, 1);
4955 case BTRFS_IOC_LOGICAL_INO_V2
:
4956 return btrfs_ioctl_logical_to_ino(fs_info
, argp
, 2);
4957 case BTRFS_IOC_SPACE_INFO
:
4958 return btrfs_ioctl_space_info(fs_info
, argp
);
4959 case BTRFS_IOC_SYNC
: {
4962 ret
= btrfs_start_delalloc_roots(fs_info
, LONG_MAX
, false);
4965 ret
= btrfs_sync_fs(inode
->i_sb
, 1);
4967 * The transaction thread may want to do more work,
4968 * namely it pokes the cleaner kthread that will start
4969 * processing uncleaned subvols.
4971 wake_up_process(fs_info
->transaction_kthread
);
4974 case BTRFS_IOC_START_SYNC
:
4975 return btrfs_ioctl_start_sync(root
, argp
);
4976 case BTRFS_IOC_WAIT_SYNC
:
4977 return btrfs_ioctl_wait_sync(fs_info
, argp
);
4978 case BTRFS_IOC_SCRUB
:
4979 return btrfs_ioctl_scrub(file
, argp
);
4980 case BTRFS_IOC_SCRUB_CANCEL
:
4981 return btrfs_ioctl_scrub_cancel(fs_info
);
4982 case BTRFS_IOC_SCRUB_PROGRESS
:
4983 return btrfs_ioctl_scrub_progress(fs_info
, argp
);
4984 case BTRFS_IOC_BALANCE_V2
:
4985 return btrfs_ioctl_balance(file
, argp
);
4986 case BTRFS_IOC_BALANCE_CTL
:
4987 return btrfs_ioctl_balance_ctl(fs_info
, arg
);
4988 case BTRFS_IOC_BALANCE_PROGRESS
:
4989 return btrfs_ioctl_balance_progress(fs_info
, argp
);
4990 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
4991 return btrfs_ioctl_set_received_subvol(file
, argp
);
4993 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
4994 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
4996 case BTRFS_IOC_SEND
:
4997 return _btrfs_ioctl_send(file
, argp
, false);
4998 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4999 case BTRFS_IOC_SEND_32
:
5000 return _btrfs_ioctl_send(file
, argp
, true);
5002 case BTRFS_IOC_GET_DEV_STATS
:
5003 return btrfs_ioctl_get_dev_stats(fs_info
, argp
);
5004 case BTRFS_IOC_QUOTA_CTL
:
5005 return btrfs_ioctl_quota_ctl(file
, argp
);
5006 case BTRFS_IOC_QGROUP_ASSIGN
:
5007 return btrfs_ioctl_qgroup_assign(file
, argp
);
5008 case BTRFS_IOC_QGROUP_CREATE
:
5009 return btrfs_ioctl_qgroup_create(file
, argp
);
5010 case BTRFS_IOC_QGROUP_LIMIT
:
5011 return btrfs_ioctl_qgroup_limit(file
, argp
);
5012 case BTRFS_IOC_QUOTA_RESCAN
:
5013 return btrfs_ioctl_quota_rescan(file
, argp
);
5014 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
5015 return btrfs_ioctl_quota_rescan_status(fs_info
, argp
);
5016 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
5017 return btrfs_ioctl_quota_rescan_wait(fs_info
, argp
);
5018 case BTRFS_IOC_DEV_REPLACE
:
5019 return btrfs_ioctl_dev_replace(fs_info
, argp
);
5020 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
5021 return btrfs_ioctl_get_supported_features(argp
);
5022 case BTRFS_IOC_GET_FEATURES
:
5023 return btrfs_ioctl_get_features(fs_info
, argp
);
5024 case BTRFS_IOC_SET_FEATURES
:
5025 return btrfs_ioctl_set_features(file
, argp
);
5026 case BTRFS_IOC_GET_SUBVOL_INFO
:
5027 return btrfs_ioctl_get_subvol_info(file
, argp
);
5028 case BTRFS_IOC_GET_SUBVOL_ROOTREF
:
5029 return btrfs_ioctl_get_subvol_rootref(file
, argp
);
5030 case BTRFS_IOC_INO_LOOKUP_USER
:
5031 return btrfs_ioctl_ino_lookup_user(file
, argp
);
5032 case FS_IOC_ENABLE_VERITY
:
5033 return fsverity_ioctl_enable(file
, (const void __user
*)argp
);
5034 case FS_IOC_MEASURE_VERITY
:
5035 return fsverity_ioctl_measure(file
, argp
);
5041 #ifdef CONFIG_COMPAT
5042 long btrfs_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
5045 * These all access 32-bit values anyway so no further
5046 * handling is necessary.
5049 case FS_IOC32_GETVERSION
:
5050 cmd
= FS_IOC_GETVERSION
;
5054 return btrfs_ioctl(file
, cmd
, (unsigned long) compat_ptr(arg
));