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>
32 #include "transaction.h"
33 #include "btrfs_inode.h"
34 #include "print-tree.h"
37 #include "inode-map.h"
39 #include "rcu-string.h"
41 #include "dev-replace.h"
46 #include "compression.h"
47 #include "space-info.h"
48 #include "delalloc-space.h"
49 #include "block-group.h"
52 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
53 * structures are incorrect, as the timespec structure from userspace
54 * is 4 bytes too small. We define these alternatives here to teach
55 * the kernel about the 32-bit struct packing.
57 struct btrfs_ioctl_timespec_32
{
60 } __attribute__ ((__packed__
));
62 struct btrfs_ioctl_received_subvol_args_32
{
63 char uuid
[BTRFS_UUID_SIZE
]; /* in */
64 __u64 stransid
; /* in */
65 __u64 rtransid
; /* out */
66 struct btrfs_ioctl_timespec_32 stime
; /* in */
67 struct btrfs_ioctl_timespec_32 rtime
; /* out */
69 __u64 reserved
[16]; /* in */
70 } __attribute__ ((__packed__
));
72 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
73 struct btrfs_ioctl_received_subvol_args_32)
76 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
77 struct btrfs_ioctl_send_args_32
{
78 __s64 send_fd
; /* in */
79 __u64 clone_sources_count
; /* in */
80 compat_uptr_t clone_sources
; /* in */
81 __u64 parent_root
; /* in */
83 __u64 reserved
[4]; /* in */
84 } __attribute__ ((__packed__
));
86 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
87 struct btrfs_ioctl_send_args_32)
90 /* Mask out flags that are inappropriate for the given type of inode. */
91 static unsigned int btrfs_mask_fsflags_for_type(struct inode
*inode
,
94 if (S_ISDIR(inode
->i_mode
))
96 else if (S_ISREG(inode
->i_mode
))
97 return flags
& ~FS_DIRSYNC_FL
;
99 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
103 * Export internal inode flags to the format expected by the FS_IOC_GETFLAGS
106 static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags
)
108 unsigned int iflags
= 0;
110 if (flags
& BTRFS_INODE_SYNC
)
111 iflags
|= FS_SYNC_FL
;
112 if (flags
& BTRFS_INODE_IMMUTABLE
)
113 iflags
|= FS_IMMUTABLE_FL
;
114 if (flags
& BTRFS_INODE_APPEND
)
115 iflags
|= FS_APPEND_FL
;
116 if (flags
& BTRFS_INODE_NODUMP
)
117 iflags
|= FS_NODUMP_FL
;
118 if (flags
& BTRFS_INODE_NOATIME
)
119 iflags
|= FS_NOATIME_FL
;
120 if (flags
& BTRFS_INODE_DIRSYNC
)
121 iflags
|= FS_DIRSYNC_FL
;
122 if (flags
& BTRFS_INODE_NODATACOW
)
123 iflags
|= FS_NOCOW_FL
;
125 if (flags
& BTRFS_INODE_NOCOMPRESS
)
126 iflags
|= FS_NOCOMP_FL
;
127 else if (flags
& BTRFS_INODE_COMPRESS
)
128 iflags
|= FS_COMPR_FL
;
134 * Update inode->i_flags based on the btrfs internal flags.
136 void btrfs_sync_inode_flags_to_i_flags(struct inode
*inode
)
138 struct btrfs_inode
*binode
= BTRFS_I(inode
);
139 unsigned int new_fl
= 0;
141 if (binode
->flags
& BTRFS_INODE_SYNC
)
143 if (binode
->flags
& BTRFS_INODE_IMMUTABLE
)
144 new_fl
|= S_IMMUTABLE
;
145 if (binode
->flags
& BTRFS_INODE_APPEND
)
147 if (binode
->flags
& BTRFS_INODE_NOATIME
)
149 if (binode
->flags
& BTRFS_INODE_DIRSYNC
)
152 set_mask_bits(&inode
->i_flags
,
153 S_SYNC
| S_APPEND
| S_IMMUTABLE
| S_NOATIME
| S_DIRSYNC
,
157 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
159 struct btrfs_inode
*binode
= BTRFS_I(file_inode(file
));
160 unsigned int flags
= btrfs_inode_flags_to_fsflags(binode
->flags
);
162 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
168 * Check if @flags are a supported and valid set of FS_*_FL flags and that
169 * the old and new flags are not conflicting
171 static int check_fsflags(unsigned int old_flags
, unsigned int flags
)
173 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
174 FS_NOATIME_FL
| FS_NODUMP_FL
| \
175 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
176 FS_NOCOMP_FL
| FS_COMPR_FL
|
180 /* COMPR and NOCOMP on new/old are valid */
181 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
184 if ((flags
& FS_COMPR_FL
) && (flags
& FS_NOCOW_FL
))
187 /* NOCOW and compression options are mutually exclusive */
188 if ((old_flags
& FS_NOCOW_FL
) && (flags
& (FS_COMPR_FL
| FS_NOCOMP_FL
)))
190 if ((flags
& FS_NOCOW_FL
) && (old_flags
& (FS_COMPR_FL
| FS_NOCOMP_FL
)))
196 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
198 struct inode
*inode
= file_inode(file
);
199 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
200 struct btrfs_inode
*binode
= BTRFS_I(inode
);
201 struct btrfs_root
*root
= binode
->root
;
202 struct btrfs_trans_handle
*trans
;
203 unsigned int fsflags
, old_fsflags
;
205 const char *comp
= NULL
;
208 if (!inode_owner_or_capable(inode
))
211 if (btrfs_root_readonly(root
))
214 if (copy_from_user(&fsflags
, arg
, sizeof(fsflags
)))
217 ret
= mnt_want_write_file(file
);
222 fsflags
= btrfs_mask_fsflags_for_type(inode
, fsflags
);
223 old_fsflags
= btrfs_inode_flags_to_fsflags(binode
->flags
);
225 ret
= vfs_ioc_setflags_prepare(inode
, old_fsflags
, fsflags
);
229 ret
= check_fsflags(old_fsflags
, fsflags
);
233 binode_flags
= binode
->flags
;
234 if (fsflags
& FS_SYNC_FL
)
235 binode_flags
|= BTRFS_INODE_SYNC
;
237 binode_flags
&= ~BTRFS_INODE_SYNC
;
238 if (fsflags
& FS_IMMUTABLE_FL
)
239 binode_flags
|= BTRFS_INODE_IMMUTABLE
;
241 binode_flags
&= ~BTRFS_INODE_IMMUTABLE
;
242 if (fsflags
& FS_APPEND_FL
)
243 binode_flags
|= BTRFS_INODE_APPEND
;
245 binode_flags
&= ~BTRFS_INODE_APPEND
;
246 if (fsflags
& FS_NODUMP_FL
)
247 binode_flags
|= BTRFS_INODE_NODUMP
;
249 binode_flags
&= ~BTRFS_INODE_NODUMP
;
250 if (fsflags
& FS_NOATIME_FL
)
251 binode_flags
|= BTRFS_INODE_NOATIME
;
253 binode_flags
&= ~BTRFS_INODE_NOATIME
;
254 if (fsflags
& FS_DIRSYNC_FL
)
255 binode_flags
|= BTRFS_INODE_DIRSYNC
;
257 binode_flags
&= ~BTRFS_INODE_DIRSYNC
;
258 if (fsflags
& FS_NOCOW_FL
) {
259 if (S_ISREG(inode
->i_mode
)) {
261 * It's safe to turn csums off here, no extents exist.
262 * Otherwise we want the flag to reflect the real COW
263 * status of the file and will not set it.
265 if (inode
->i_size
== 0)
266 binode_flags
|= BTRFS_INODE_NODATACOW
|
267 BTRFS_INODE_NODATASUM
;
269 binode_flags
|= BTRFS_INODE_NODATACOW
;
273 * Revert back under same assumptions as above
275 if (S_ISREG(inode
->i_mode
)) {
276 if (inode
->i_size
== 0)
277 binode_flags
&= ~(BTRFS_INODE_NODATACOW
|
278 BTRFS_INODE_NODATASUM
);
280 binode_flags
&= ~BTRFS_INODE_NODATACOW
;
285 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
286 * flag may be changed automatically if compression code won't make
289 if (fsflags
& FS_NOCOMP_FL
) {
290 binode_flags
&= ~BTRFS_INODE_COMPRESS
;
291 binode_flags
|= BTRFS_INODE_NOCOMPRESS
;
292 } else if (fsflags
& FS_COMPR_FL
) {
294 if (IS_SWAPFILE(inode
)) {
299 binode_flags
|= BTRFS_INODE_COMPRESS
;
300 binode_flags
&= ~BTRFS_INODE_NOCOMPRESS
;
302 comp
= btrfs_compress_type2str(fs_info
->compress_type
);
303 if (!comp
|| comp
[0] == 0)
304 comp
= btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB
);
306 binode_flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
313 trans
= btrfs_start_transaction(root
, 3);
315 ret
= PTR_ERR(trans
);
320 ret
= btrfs_set_prop(trans
, inode
, "btrfs.compression", comp
,
323 btrfs_abort_transaction(trans
, ret
);
327 ret
= btrfs_set_prop(trans
, inode
, "btrfs.compression", NULL
,
329 if (ret
&& ret
!= -ENODATA
) {
330 btrfs_abort_transaction(trans
, ret
);
335 binode
->flags
= binode_flags
;
336 btrfs_sync_inode_flags_to_i_flags(inode
);
337 inode_inc_iversion(inode
);
338 inode
->i_ctime
= current_time(inode
);
339 ret
= btrfs_update_inode(trans
, root
, inode
);
342 btrfs_end_transaction(trans
);
345 mnt_drop_write_file(file
);
350 * Translate btrfs internal inode flags to xflags as expected by the
351 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
354 static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags
)
356 unsigned int xflags
= 0;
358 if (flags
& BTRFS_INODE_APPEND
)
359 xflags
|= FS_XFLAG_APPEND
;
360 if (flags
& BTRFS_INODE_IMMUTABLE
)
361 xflags
|= FS_XFLAG_IMMUTABLE
;
362 if (flags
& BTRFS_INODE_NOATIME
)
363 xflags
|= FS_XFLAG_NOATIME
;
364 if (flags
& BTRFS_INODE_NODUMP
)
365 xflags
|= FS_XFLAG_NODUMP
;
366 if (flags
& BTRFS_INODE_SYNC
)
367 xflags
|= FS_XFLAG_SYNC
;
372 /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
373 static int check_xflags(unsigned int flags
)
375 if (flags
& ~(FS_XFLAG_APPEND
| FS_XFLAG_IMMUTABLE
| FS_XFLAG_NOATIME
|
376 FS_XFLAG_NODUMP
| FS_XFLAG_SYNC
))
382 * Set the xflags from the internal inode flags. The remaining items of fsxattr
385 static int btrfs_ioctl_fsgetxattr(struct file
*file
, void __user
*arg
)
387 struct btrfs_inode
*binode
= BTRFS_I(file_inode(file
));
390 simple_fill_fsxattr(&fa
, btrfs_inode_flags_to_xflags(binode
->flags
));
391 if (copy_to_user(arg
, &fa
, sizeof(fa
)))
397 static int btrfs_ioctl_fssetxattr(struct file
*file
, void __user
*arg
)
399 struct inode
*inode
= file_inode(file
);
400 struct btrfs_inode
*binode
= BTRFS_I(inode
);
401 struct btrfs_root
*root
= binode
->root
;
402 struct btrfs_trans_handle
*trans
;
403 struct fsxattr fa
, old_fa
;
405 unsigned old_i_flags
;
408 if (!inode_owner_or_capable(inode
))
411 if (btrfs_root_readonly(root
))
414 if (copy_from_user(&fa
, arg
, sizeof(fa
)))
417 ret
= check_xflags(fa
.fsx_xflags
);
421 if (fa
.fsx_extsize
!= 0 || fa
.fsx_projid
!= 0 || fa
.fsx_cowextsize
!= 0)
424 ret
= mnt_want_write_file(file
);
430 old_flags
= binode
->flags
;
431 old_i_flags
= inode
->i_flags
;
433 simple_fill_fsxattr(&old_fa
,
434 btrfs_inode_flags_to_xflags(binode
->flags
));
435 ret
= vfs_ioc_fssetxattr_check(inode
, &old_fa
, &fa
);
439 if (fa
.fsx_xflags
& FS_XFLAG_SYNC
)
440 binode
->flags
|= BTRFS_INODE_SYNC
;
442 binode
->flags
&= ~BTRFS_INODE_SYNC
;
443 if (fa
.fsx_xflags
& FS_XFLAG_IMMUTABLE
)
444 binode
->flags
|= BTRFS_INODE_IMMUTABLE
;
446 binode
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
447 if (fa
.fsx_xflags
& FS_XFLAG_APPEND
)
448 binode
->flags
|= BTRFS_INODE_APPEND
;
450 binode
->flags
&= ~BTRFS_INODE_APPEND
;
451 if (fa
.fsx_xflags
& FS_XFLAG_NODUMP
)
452 binode
->flags
|= BTRFS_INODE_NODUMP
;
454 binode
->flags
&= ~BTRFS_INODE_NODUMP
;
455 if (fa
.fsx_xflags
& FS_XFLAG_NOATIME
)
456 binode
->flags
|= BTRFS_INODE_NOATIME
;
458 binode
->flags
&= ~BTRFS_INODE_NOATIME
;
460 /* 1 item for the inode */
461 trans
= btrfs_start_transaction(root
, 1);
463 ret
= PTR_ERR(trans
);
467 btrfs_sync_inode_flags_to_i_flags(inode
);
468 inode_inc_iversion(inode
);
469 inode
->i_ctime
= current_time(inode
);
470 ret
= btrfs_update_inode(trans
, root
, inode
);
472 btrfs_end_transaction(trans
);
476 binode
->flags
= old_flags
;
477 inode
->i_flags
= old_i_flags
;
481 mnt_drop_write_file(file
);
486 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
488 struct inode
*inode
= file_inode(file
);
490 return put_user(inode
->i_generation
, arg
);
493 static noinline
int btrfs_ioctl_fitrim(struct btrfs_fs_info
*fs_info
,
496 struct btrfs_device
*device
;
497 struct request_queue
*q
;
498 struct fstrim_range range
;
499 u64 minlen
= ULLONG_MAX
;
503 if (!capable(CAP_SYS_ADMIN
))
507 * If the fs is mounted with nologreplay, which requires it to be
508 * mounted in RO mode as well, we can not allow discard on free space
509 * inside block groups, because log trees refer to extents that are not
510 * pinned in a block group's free space cache (pinning the extents is
511 * precisely the first phase of replaying a log tree).
513 if (btrfs_test_opt(fs_info
, NOLOGREPLAY
))
517 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
521 q
= bdev_get_queue(device
->bdev
);
522 if (blk_queue_discard(q
)) {
524 minlen
= min_t(u64
, q
->limits
.discard_granularity
,
532 if (copy_from_user(&range
, arg
, sizeof(range
)))
536 * NOTE: Don't truncate the range using super->total_bytes. Bytenr of
537 * block group is in the logical address space, which can be any
538 * sectorsize aligned bytenr in the range [0, U64_MAX].
540 if (range
.len
< fs_info
->sb
->s_blocksize
)
543 range
.minlen
= max(range
.minlen
, minlen
);
544 ret
= btrfs_trim_fs(fs_info
, &range
);
548 if (copy_to_user(arg
, &range
, sizeof(range
)))
554 int __pure
btrfs_is_empty_uuid(u8
*uuid
)
558 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
565 static noinline
int create_subvol(struct inode
*dir
,
566 struct dentry
*dentry
,
567 const char *name
, int namelen
,
568 struct btrfs_qgroup_inherit
*inherit
)
570 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
571 struct btrfs_trans_handle
*trans
;
572 struct btrfs_key key
;
573 struct btrfs_root_item
*root_item
;
574 struct btrfs_inode_item
*inode_item
;
575 struct extent_buffer
*leaf
;
576 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
577 struct btrfs_root
*new_root
;
578 struct btrfs_block_rsv block_rsv
;
579 struct timespec64 cur_time
= current_time(dir
);
585 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
588 root_item
= kzalloc(sizeof(*root_item
), GFP_KERNEL
);
592 ret
= btrfs_find_free_objectid(fs_info
->tree_root
, &objectid
);
596 ret
= get_anon_bdev(&anon_dev
);
601 * Don't create subvolume whose level is not zero. Or qgroup will be
602 * screwed up since it assumes subvolume qgroup's level to be 0.
604 if (btrfs_qgroup_level(objectid
)) {
609 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
611 * The same as the snapshot creation, please see the comment
612 * of create_snapshot().
614 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
, 8, false);
618 trans
= btrfs_start_transaction(root
, 0);
620 ret
= PTR_ERR(trans
);
621 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
);
624 trans
->block_rsv
= &block_rsv
;
625 trans
->bytes_reserved
= block_rsv
.size
;
627 ret
= btrfs_qgroup_inherit(trans
, 0, objectid
, inherit
);
631 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
637 btrfs_mark_buffer_dirty(leaf
);
639 inode_item
= &root_item
->inode
;
640 btrfs_set_stack_inode_generation(inode_item
, 1);
641 btrfs_set_stack_inode_size(inode_item
, 3);
642 btrfs_set_stack_inode_nlink(inode_item
, 1);
643 btrfs_set_stack_inode_nbytes(inode_item
,
645 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
647 btrfs_set_root_flags(root_item
, 0);
648 btrfs_set_root_limit(root_item
, 0);
649 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
651 btrfs_set_root_bytenr(root_item
, leaf
->start
);
652 btrfs_set_root_generation(root_item
, trans
->transid
);
653 btrfs_set_root_level(root_item
, 0);
654 btrfs_set_root_refs(root_item
, 1);
655 btrfs_set_root_used(root_item
, leaf
->len
);
656 btrfs_set_root_last_snapshot(root_item
, 0);
658 btrfs_set_root_generation_v2(root_item
,
659 btrfs_root_generation(root_item
));
660 generate_random_guid(root_item
->uuid
);
661 btrfs_set_stack_timespec_sec(&root_item
->otime
, cur_time
.tv_sec
);
662 btrfs_set_stack_timespec_nsec(&root_item
->otime
, cur_time
.tv_nsec
);
663 root_item
->ctime
= root_item
->otime
;
664 btrfs_set_root_ctransid(root_item
, trans
->transid
);
665 btrfs_set_root_otransid(root_item
, trans
->transid
);
667 btrfs_tree_unlock(leaf
);
668 free_extent_buffer(leaf
);
671 btrfs_set_root_dirid(root_item
, new_dirid
);
673 key
.objectid
= objectid
;
675 key
.type
= BTRFS_ROOT_ITEM_KEY
;
676 ret
= btrfs_insert_root(trans
, fs_info
->tree_root
, &key
,
681 key
.offset
= (u64
)-1;
682 new_root
= btrfs_get_new_fs_root(fs_info
, objectid
, anon_dev
);
683 if (IS_ERR(new_root
)) {
684 free_anon_bdev(anon_dev
);
685 ret
= PTR_ERR(new_root
);
686 btrfs_abort_transaction(trans
, ret
);
689 /* Freeing will be done in btrfs_put_root() of new_root */
692 btrfs_record_root_in_trans(trans
, new_root
);
694 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, new_dirid
);
695 btrfs_put_root(new_root
);
697 /* We potentially lose an unused inode item here */
698 btrfs_abort_transaction(trans
, ret
);
702 mutex_lock(&new_root
->objectid_mutex
);
703 new_root
->highest_objectid
= new_dirid
;
704 mutex_unlock(&new_root
->objectid_mutex
);
707 * insert the directory item
709 ret
= btrfs_set_inode_index(BTRFS_I(dir
), &index
);
711 btrfs_abort_transaction(trans
, ret
);
715 ret
= btrfs_insert_dir_item(trans
, name
, namelen
, BTRFS_I(dir
), &key
,
716 BTRFS_FT_DIR
, index
);
718 btrfs_abort_transaction(trans
, ret
);
722 btrfs_i_size_write(BTRFS_I(dir
), dir
->i_size
+ namelen
* 2);
723 ret
= btrfs_update_inode(trans
, root
, dir
);
725 btrfs_abort_transaction(trans
, ret
);
729 ret
= btrfs_add_root_ref(trans
, objectid
, root
->root_key
.objectid
,
730 btrfs_ino(BTRFS_I(dir
)), index
, name
, namelen
);
732 btrfs_abort_transaction(trans
, ret
);
736 ret
= btrfs_uuid_tree_add(trans
, root_item
->uuid
,
737 BTRFS_UUID_KEY_SUBVOL
, objectid
);
739 btrfs_abort_transaction(trans
, ret
);
743 trans
->block_rsv
= NULL
;
744 trans
->bytes_reserved
= 0;
745 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
);
747 err
= btrfs_commit_transaction(trans
);
752 inode
= btrfs_lookup_dentry(dir
, dentry
);
754 return PTR_ERR(inode
);
755 d_instantiate(dentry
, inode
);
761 free_anon_bdev(anon_dev
);
766 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
767 struct dentry
*dentry
, bool readonly
,
768 struct btrfs_qgroup_inherit
*inherit
)
770 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
772 struct btrfs_pending_snapshot
*pending_snapshot
;
773 struct btrfs_trans_handle
*trans
;
776 if (!test_bit(BTRFS_ROOT_SHAREABLE
, &root
->state
))
779 if (atomic_read(&root
->nr_swapfiles
)) {
781 "cannot snapshot subvolume with active swapfile");
785 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_KERNEL
);
786 if (!pending_snapshot
)
789 ret
= get_anon_bdev(&pending_snapshot
->anon_dev
);
792 pending_snapshot
->root_item
= kzalloc(sizeof(struct btrfs_root_item
),
794 pending_snapshot
->path
= btrfs_alloc_path();
795 if (!pending_snapshot
->root_item
|| !pending_snapshot
->path
) {
800 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
801 BTRFS_BLOCK_RSV_TEMP
);
803 * 1 - parent dir inode
806 * 2 - root ref/backref
807 * 1 - root of snapshot
810 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
811 &pending_snapshot
->block_rsv
, 8,
816 pending_snapshot
->dentry
= dentry
;
817 pending_snapshot
->root
= root
;
818 pending_snapshot
->readonly
= readonly
;
819 pending_snapshot
->dir
= dir
;
820 pending_snapshot
->inherit
= inherit
;
822 trans
= btrfs_start_transaction(root
, 0);
824 ret
= PTR_ERR(trans
);
828 spin_lock(&fs_info
->trans_lock
);
829 list_add(&pending_snapshot
->list
,
830 &trans
->transaction
->pending_snapshots
);
831 spin_unlock(&fs_info
->trans_lock
);
833 ret
= btrfs_commit_transaction(trans
);
837 ret
= pending_snapshot
->error
;
841 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
845 inode
= btrfs_lookup_dentry(d_inode(dentry
->d_parent
), dentry
);
847 ret
= PTR_ERR(inode
);
851 d_instantiate(dentry
, inode
);
853 pending_snapshot
->anon_dev
= 0;
855 /* Prevent double freeing of anon_dev */
856 if (ret
&& pending_snapshot
->snap
)
857 pending_snapshot
->snap
->anon_dev
= 0;
858 btrfs_put_root(pending_snapshot
->snap
);
859 btrfs_subvolume_release_metadata(fs_info
, &pending_snapshot
->block_rsv
);
861 if (pending_snapshot
->anon_dev
)
862 free_anon_bdev(pending_snapshot
->anon_dev
);
863 kfree(pending_snapshot
->root_item
);
864 btrfs_free_path(pending_snapshot
->path
);
865 kfree(pending_snapshot
);
870 /* copy of may_delete in fs/namei.c()
871 * Check whether we can remove a link victim from directory dir, check
872 * whether the type of victim is right.
873 * 1. We can't do it if dir is read-only (done in permission())
874 * 2. We should have write and exec permissions on dir
875 * 3. We can't remove anything from append-only dir
876 * 4. We can't do anything with immutable dir (done in permission())
877 * 5. If the sticky bit on dir is set we should either
878 * a. be owner of dir, or
879 * b. be owner of victim, or
880 * c. have CAP_FOWNER capability
881 * 6. If the victim is append-only or immutable we can't do anything with
882 * links pointing to it.
883 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
884 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
885 * 9. We can't remove a root or mountpoint.
886 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
887 * nfs_async_unlink().
890 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
894 if (d_really_is_negative(victim
))
897 BUG_ON(d_inode(victim
->d_parent
) != dir
);
898 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
900 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
905 if (check_sticky(dir
, d_inode(victim
)) || IS_APPEND(d_inode(victim
)) ||
906 IS_IMMUTABLE(d_inode(victim
)) || IS_SWAPFILE(d_inode(victim
)))
909 if (!d_is_dir(victim
))
913 } else if (d_is_dir(victim
))
917 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
922 /* copy of may_create in fs/namei.c() */
923 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
925 if (d_really_is_positive(child
))
929 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
933 * Create a new subvolume below @parent. This is largely modeled after
934 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
935 * inside this filesystem so it's quite a bit simpler.
937 static noinline
int btrfs_mksubvol(const struct path
*parent
,
938 const char *name
, int namelen
,
939 struct btrfs_root
*snap_src
,
941 struct btrfs_qgroup_inherit
*inherit
)
943 struct inode
*dir
= d_inode(parent
->dentry
);
944 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
945 struct dentry
*dentry
;
948 error
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
952 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
953 error
= PTR_ERR(dentry
);
957 error
= btrfs_may_create(dir
, dentry
);
962 * even if this name doesn't exist, we may get hash collisions.
963 * check for them now when we can safely fail
965 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
971 down_read(&fs_info
->subvol_sem
);
973 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
977 error
= create_snapshot(snap_src
, dir
, dentry
, readonly
, inherit
);
979 error
= create_subvol(dir
, dentry
, name
, namelen
, inherit
);
982 fsnotify_mkdir(dir
, dentry
);
984 up_read(&fs_info
->subvol_sem
);
992 static noinline
int btrfs_mksnapshot(const struct path
*parent
,
993 const char *name
, int namelen
,
994 struct btrfs_root
*root
,
996 struct btrfs_qgroup_inherit
*inherit
)
999 bool snapshot_force_cow
= false;
1002 * Force new buffered writes to reserve space even when NOCOW is
1003 * possible. This is to avoid later writeback (running dealloc) to
1004 * fallback to COW mode and unexpectedly fail with ENOSPC.
1006 btrfs_drew_read_lock(&root
->snapshot_lock
);
1008 ret
= btrfs_start_delalloc_snapshot(root
);
1013 * All previous writes have started writeback in NOCOW mode, so now
1014 * we force future writes to fallback to COW mode during snapshot
1017 atomic_inc(&root
->snapshot_force_cow
);
1018 snapshot_force_cow
= true;
1020 btrfs_wait_ordered_extents(root
, U64_MAX
, 0, (u64
)-1);
1022 ret
= btrfs_mksubvol(parent
, name
, namelen
,
1023 root
, readonly
, inherit
);
1025 if (snapshot_force_cow
)
1026 atomic_dec(&root
->snapshot_force_cow
);
1027 btrfs_drew_read_unlock(&root
->snapshot_lock
);
1032 * When we're defragging a range, we don't want to kick it off again
1033 * if it is really just waiting for delalloc to send it down.
1034 * If we find a nice big extent or delalloc range for the bytes in the
1035 * file you want to defrag, we return 0 to let you know to skip this
1038 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
1040 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1041 struct extent_map
*em
= NULL
;
1042 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1045 read_lock(&em_tree
->lock
);
1046 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_SIZE
);
1047 read_unlock(&em_tree
->lock
);
1050 end
= extent_map_end(em
);
1051 free_extent_map(em
);
1052 if (end
- offset
> thresh
)
1055 /* if we already have a nice delalloc here, just stop */
1057 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
1058 thresh
, EXTENT_DELALLOC
, 1);
1065 * helper function to walk through a file and find extents
1066 * newer than a specific transid, and smaller than thresh.
1068 * This is used by the defragging code to find new and small
1071 static int find_new_extents(struct btrfs_root
*root
,
1072 struct inode
*inode
, u64 newer_than
,
1073 u64
*off
, u32 thresh
)
1075 struct btrfs_path
*path
;
1076 struct btrfs_key min_key
;
1077 struct extent_buffer
*leaf
;
1078 struct btrfs_file_extent_item
*extent
;
1081 u64 ino
= btrfs_ino(BTRFS_I(inode
));
1083 path
= btrfs_alloc_path();
1087 min_key
.objectid
= ino
;
1088 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
1089 min_key
.offset
= *off
;
1092 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
1096 if (min_key
.objectid
!= ino
)
1098 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
1101 leaf
= path
->nodes
[0];
1102 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1103 struct btrfs_file_extent_item
);
1105 type
= btrfs_file_extent_type(leaf
, extent
);
1106 if (type
== BTRFS_FILE_EXTENT_REG
&&
1107 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
1108 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
1109 *off
= min_key
.offset
;
1110 btrfs_free_path(path
);
1115 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
1116 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
1120 if (min_key
.offset
== (u64
)-1)
1124 btrfs_release_path(path
);
1127 btrfs_free_path(path
);
1131 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
1133 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1134 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1135 struct extent_map
*em
;
1136 u64 len
= PAGE_SIZE
;
1139 * hopefully we have this extent in the tree already, try without
1140 * the full extent lock
1142 read_lock(&em_tree
->lock
);
1143 em
= lookup_extent_mapping(em_tree
, start
, len
);
1144 read_unlock(&em_tree
->lock
);
1147 struct extent_state
*cached
= NULL
;
1148 u64 end
= start
+ len
- 1;
1150 /* get the big lock and read metadata off disk */
1151 lock_extent_bits(io_tree
, start
, end
, &cached
);
1152 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, start
, len
);
1153 unlock_extent_cached(io_tree
, start
, end
, &cached
);
1162 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1164 struct extent_map
*next
;
1167 /* this is the last extent */
1168 if (em
->start
+ em
->len
>= i_size_read(inode
))
1171 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1172 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1174 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1175 (em
->block_len
> SZ_128K
&& next
->block_len
> SZ_128K
))
1178 free_extent_map(next
);
1182 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1183 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1186 struct extent_map
*em
;
1188 bool next_mergeable
= true;
1189 bool prev_mergeable
= true;
1192 * make sure that once we start defragging an extent, we keep on
1195 if (start
< *defrag_end
)
1200 em
= defrag_lookup_extent(inode
, start
);
1204 /* this will cover holes, and inline extents */
1205 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1211 prev_mergeable
= false;
1213 next_mergeable
= defrag_check_next_extent(inode
, em
);
1215 * we hit a real extent, if it is big or the next extent is not a
1216 * real extent, don't bother defragging it
1218 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1219 (em
->len
>= thresh
|| (!next_mergeable
&& !prev_mergeable
)))
1223 * last_len ends up being a counter of how many bytes we've defragged.
1224 * every time we choose not to defrag an extent, we reset *last_len
1225 * so that the next tiny extent will force a defrag.
1227 * The end result of this is that tiny extents before a single big
1228 * extent will force at least part of that big extent to be defragged.
1231 *defrag_end
= extent_map_end(em
);
1234 *skip
= extent_map_end(em
);
1238 free_extent_map(em
);
1243 * it doesn't do much good to defrag one or two pages
1244 * at a time. This pulls in a nice chunk of pages
1245 * to COW and defrag.
1247 * It also makes sure the delalloc code has enough
1248 * dirty data to avoid making new small extents as part
1251 * It's a good idea to start RA on this range
1252 * before calling this.
1254 static int cluster_pages_for_defrag(struct inode
*inode
,
1255 struct page
**pages
,
1256 unsigned long start_index
,
1257 unsigned long num_pages
)
1259 unsigned long file_end
;
1260 u64 isize
= i_size_read(inode
);
1267 struct btrfs_ordered_extent
*ordered
;
1268 struct extent_state
*cached_state
= NULL
;
1269 struct extent_io_tree
*tree
;
1270 struct extent_changeset
*data_reserved
= NULL
;
1271 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1273 file_end
= (isize
- 1) >> PAGE_SHIFT
;
1274 if (!isize
|| start_index
> file_end
)
1277 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1279 ret
= btrfs_delalloc_reserve_space(BTRFS_I(inode
), &data_reserved
,
1280 start_index
<< PAGE_SHIFT
,
1281 page_cnt
<< PAGE_SHIFT
);
1285 tree
= &BTRFS_I(inode
)->io_tree
;
1287 /* step one, lock all the pages */
1288 for (i
= 0; i
< page_cnt
; i
++) {
1291 page
= find_or_create_page(inode
->i_mapping
,
1292 start_index
+ i
, mask
);
1296 page_start
= page_offset(page
);
1297 page_end
= page_start
+ PAGE_SIZE
- 1;
1299 lock_extent_bits(tree
, page_start
, page_end
,
1301 ordered
= btrfs_lookup_ordered_extent(BTRFS_I(inode
),
1303 unlock_extent_cached(tree
, page_start
, page_end
,
1309 btrfs_start_ordered_extent(inode
, ordered
, 1);
1310 btrfs_put_ordered_extent(ordered
);
1313 * we unlocked the page above, so we need check if
1314 * it was released or not.
1316 if (page
->mapping
!= inode
->i_mapping
) {
1323 if (!PageUptodate(page
)) {
1324 btrfs_readpage(NULL
, page
);
1326 if (!PageUptodate(page
)) {
1334 if (page
->mapping
!= inode
->i_mapping
) {
1346 if (!(inode
->i_sb
->s_flags
& SB_ACTIVE
))
1350 * so now we have a nice long stream of locked
1351 * and up to date pages, lets wait on them
1353 for (i
= 0; i
< i_done
; i
++)
1354 wait_on_page_writeback(pages
[i
]);
1356 page_start
= page_offset(pages
[0]);
1357 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_SIZE
;
1359 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1360 page_start
, page_end
- 1, &cached_state
);
1361 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1362 page_end
- 1, EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
1363 EXTENT_DEFRAG
, 0, 0, &cached_state
);
1365 if (i_done
!= page_cnt
) {
1366 spin_lock(&BTRFS_I(inode
)->lock
);
1367 btrfs_mod_outstanding_extents(BTRFS_I(inode
), 1);
1368 spin_unlock(&BTRFS_I(inode
)->lock
);
1369 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
1370 start_index
<< PAGE_SHIFT
,
1371 (page_cnt
- i_done
) << PAGE_SHIFT
, true);
1375 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1378 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1379 page_start
, page_end
- 1, &cached_state
);
1381 for (i
= 0; i
< i_done
; i
++) {
1382 clear_page_dirty_for_io(pages
[i
]);
1383 ClearPageChecked(pages
[i
]);
1384 set_page_extent_mapped(pages
[i
]);
1385 set_page_dirty(pages
[i
]);
1386 unlock_page(pages
[i
]);
1389 btrfs_delalloc_release_extents(BTRFS_I(inode
), page_cnt
<< PAGE_SHIFT
);
1390 extent_changeset_free(data_reserved
);
1393 for (i
= 0; i
< i_done
; i
++) {
1394 unlock_page(pages
[i
]);
1397 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
1398 start_index
<< PAGE_SHIFT
,
1399 page_cnt
<< PAGE_SHIFT
, true);
1400 btrfs_delalloc_release_extents(BTRFS_I(inode
), page_cnt
<< PAGE_SHIFT
);
1401 extent_changeset_free(data_reserved
);
1406 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1407 struct btrfs_ioctl_defrag_range_args
*range
,
1408 u64 newer_than
, unsigned long max_to_defrag
)
1410 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1411 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1412 struct file_ra_state
*ra
= NULL
;
1413 unsigned long last_index
;
1414 u64 isize
= i_size_read(inode
);
1418 u64 newer_off
= range
->start
;
1420 unsigned long ra_index
= 0;
1422 int defrag_count
= 0;
1423 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1424 u32 extent_thresh
= range
->extent_thresh
;
1425 unsigned long max_cluster
= SZ_256K
>> PAGE_SHIFT
;
1426 unsigned long cluster
= max_cluster
;
1427 u64 new_align
= ~((u64
)SZ_128K
- 1);
1428 struct page
**pages
= NULL
;
1429 bool do_compress
= range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
;
1434 if (range
->start
>= isize
)
1438 if (range
->compress_type
>= BTRFS_NR_COMPRESS_TYPES
)
1440 if (range
->compress_type
)
1441 compress_type
= range
->compress_type
;
1444 if (extent_thresh
== 0)
1445 extent_thresh
= SZ_256K
;
1448 * If we were not given a file, allocate a readahead context. As
1449 * readahead is just an optimization, defrag will work without it so
1450 * we don't error out.
1453 ra
= kzalloc(sizeof(*ra
), GFP_KERNEL
);
1455 file_ra_state_init(ra
, inode
->i_mapping
);
1460 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*), GFP_KERNEL
);
1466 /* find the last page to defrag */
1467 if (range
->start
+ range
->len
> range
->start
) {
1468 last_index
= min_t(u64
, isize
- 1,
1469 range
->start
+ range
->len
- 1) >> PAGE_SHIFT
;
1471 last_index
= (isize
- 1) >> PAGE_SHIFT
;
1475 ret
= find_new_extents(root
, inode
, newer_than
,
1476 &newer_off
, SZ_64K
);
1478 range
->start
= newer_off
;
1480 * we always align our defrag to help keep
1481 * the extents in the file evenly spaced
1483 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1487 i
= range
->start
>> PAGE_SHIFT
;
1490 max_to_defrag
= last_index
- i
+ 1;
1493 * make writeback starts from i, so the defrag range can be
1494 * written sequentially.
1496 if (i
< inode
->i_mapping
->writeback_index
)
1497 inode
->i_mapping
->writeback_index
= i
;
1499 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1500 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_SIZE
))) {
1502 * make sure we stop running if someone unmounts
1505 if (!(inode
->i_sb
->s_flags
& SB_ACTIVE
))
1508 if (btrfs_defrag_cancelled(fs_info
)) {
1509 btrfs_debug(fs_info
, "defrag_file cancelled");
1514 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_SHIFT
,
1515 extent_thresh
, &last_len
, &skip
,
1516 &defrag_end
, do_compress
)){
1519 * the should_defrag function tells us how much to skip
1520 * bump our counter by the suggested amount
1522 next
= DIV_ROUND_UP(skip
, PAGE_SIZE
);
1523 i
= max(i
+ 1, next
);
1528 cluster
= (PAGE_ALIGN(defrag_end
) >>
1530 cluster
= min(cluster
, max_cluster
);
1532 cluster
= max_cluster
;
1535 if (i
+ cluster
> ra_index
) {
1536 ra_index
= max(i
, ra_index
);
1538 page_cache_sync_readahead(inode
->i_mapping
, ra
,
1539 file
, ra_index
, cluster
);
1540 ra_index
+= cluster
;
1544 if (IS_SWAPFILE(inode
)) {
1548 BTRFS_I(inode
)->defrag_compress
= compress_type
;
1549 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1552 inode_unlock(inode
);
1556 defrag_count
+= ret
;
1557 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1558 inode_unlock(inode
);
1561 if (newer_off
== (u64
)-1)
1567 newer_off
= max(newer_off
+ 1,
1568 (u64
)i
<< PAGE_SHIFT
);
1570 ret
= find_new_extents(root
, inode
, newer_than
,
1571 &newer_off
, SZ_64K
);
1573 range
->start
= newer_off
;
1574 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1581 last_len
+= ret
<< PAGE_SHIFT
;
1589 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1590 filemap_flush(inode
->i_mapping
);
1591 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1592 &BTRFS_I(inode
)->runtime_flags
))
1593 filemap_flush(inode
->i_mapping
);
1596 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1597 btrfs_set_fs_incompat(fs_info
, COMPRESS_LZO
);
1598 } else if (range
->compress_type
== BTRFS_COMPRESS_ZSTD
) {
1599 btrfs_set_fs_incompat(fs_info
, COMPRESS_ZSTD
);
1607 BTRFS_I(inode
)->defrag_compress
= BTRFS_COMPRESS_NONE
;
1608 inode_unlock(inode
);
1616 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1619 struct inode
*inode
= file_inode(file
);
1620 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1624 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1625 struct btrfs_ioctl_vol_args
*vol_args
;
1626 struct btrfs_trans_handle
*trans
;
1627 struct btrfs_device
*device
= NULL
;
1630 char *devstr
= NULL
;
1634 if (!capable(CAP_SYS_ADMIN
))
1637 ret
= mnt_want_write_file(file
);
1641 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
1642 mnt_drop_write_file(file
);
1643 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1646 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1647 if (IS_ERR(vol_args
)) {
1648 ret
= PTR_ERR(vol_args
);
1652 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1654 sizestr
= vol_args
->name
;
1655 devstr
= strchr(sizestr
, ':');
1657 sizestr
= devstr
+ 1;
1659 devstr
= vol_args
->name
;
1660 ret
= kstrtoull(devstr
, 10, &devid
);
1667 btrfs_info(fs_info
, "resizing devid %llu", devid
);
1670 device
= btrfs_find_device(fs_info
->fs_devices
, devid
, NULL
, NULL
, true);
1672 btrfs_info(fs_info
, "resizer unable to find device %llu",
1678 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
1680 "resizer unable to apply on readonly device %llu",
1686 if (!strcmp(sizestr
, "max"))
1687 new_size
= device
->bdev
->bd_inode
->i_size
;
1689 if (sizestr
[0] == '-') {
1692 } else if (sizestr
[0] == '+') {
1696 new_size
= memparse(sizestr
, &retptr
);
1697 if (*retptr
!= '\0' || new_size
== 0) {
1703 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
1708 old_size
= btrfs_device_get_total_bytes(device
);
1711 if (new_size
> old_size
) {
1715 new_size
= old_size
- new_size
;
1716 } else if (mod
> 0) {
1717 if (new_size
> ULLONG_MAX
- old_size
) {
1721 new_size
= old_size
+ new_size
;
1724 if (new_size
< SZ_256M
) {
1728 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1733 new_size
= round_down(new_size
, fs_info
->sectorsize
);
1735 if (new_size
> old_size
) {
1736 trans
= btrfs_start_transaction(root
, 0);
1737 if (IS_ERR(trans
)) {
1738 ret
= PTR_ERR(trans
);
1741 ret
= btrfs_grow_device(trans
, device
, new_size
);
1742 btrfs_commit_transaction(trans
);
1743 } else if (new_size
< old_size
) {
1744 ret
= btrfs_shrink_device(device
, new_size
);
1745 } /* equal, nothing need to do */
1747 if (ret
== 0 && new_size
!= old_size
)
1748 btrfs_info_in_rcu(fs_info
,
1749 "resize device %s (devid %llu) from %llu to %llu",
1750 rcu_str_deref(device
->name
), device
->devid
,
1751 old_size
, new_size
);
1755 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
1756 mnt_drop_write_file(file
);
1760 static noinline
int __btrfs_ioctl_snap_create(struct file
*file
,
1761 const char *name
, unsigned long fd
, int subvol
,
1763 struct btrfs_qgroup_inherit
*inherit
)
1768 if (!S_ISDIR(file_inode(file
)->i_mode
))
1771 ret
= mnt_want_write_file(file
);
1775 namelen
= strlen(name
);
1776 if (strchr(name
, '/')) {
1778 goto out_drop_write
;
1781 if (name
[0] == '.' &&
1782 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1784 goto out_drop_write
;
1788 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1789 NULL
, readonly
, inherit
);
1791 struct fd src
= fdget(fd
);
1792 struct inode
*src_inode
;
1795 goto out_drop_write
;
1798 src_inode
= file_inode(src
.file
);
1799 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1800 btrfs_info(BTRFS_I(file_inode(file
))->root
->fs_info
,
1801 "Snapshot src from another FS");
1803 } else if (!inode_owner_or_capable(src_inode
)) {
1805 * Subvolume creation is not restricted, but snapshots
1806 * are limited to own subvolumes only
1810 ret
= btrfs_mksnapshot(&file
->f_path
, name
, namelen
,
1811 BTRFS_I(src_inode
)->root
,
1817 mnt_drop_write_file(file
);
1822 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1823 void __user
*arg
, int subvol
)
1825 struct btrfs_ioctl_vol_args
*vol_args
;
1828 if (!S_ISDIR(file_inode(file
)->i_mode
))
1831 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1832 if (IS_ERR(vol_args
))
1833 return PTR_ERR(vol_args
);
1834 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1836 ret
= __btrfs_ioctl_snap_create(file
, vol_args
->name
, vol_args
->fd
,
1837 subvol
, false, NULL
);
1843 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1844 void __user
*arg
, int subvol
)
1846 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1848 bool readonly
= false;
1849 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1851 if (!S_ISDIR(file_inode(file
)->i_mode
))
1854 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1855 if (IS_ERR(vol_args
))
1856 return PTR_ERR(vol_args
);
1857 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1859 if (vol_args
->flags
& ~BTRFS_SUBVOL_CREATE_ARGS_MASK
) {
1864 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1866 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1867 if (vol_args
->size
> PAGE_SIZE
) {
1871 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1872 if (IS_ERR(inherit
)) {
1873 ret
= PTR_ERR(inherit
);
1878 ret
= __btrfs_ioctl_snap_create(file
, vol_args
->name
, vol_args
->fd
,
1879 subvol
, readonly
, inherit
);
1889 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1892 struct inode
*inode
= file_inode(file
);
1893 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1894 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1898 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
)
1901 down_read(&fs_info
->subvol_sem
);
1902 if (btrfs_root_readonly(root
))
1903 flags
|= BTRFS_SUBVOL_RDONLY
;
1904 up_read(&fs_info
->subvol_sem
);
1906 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1912 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1915 struct inode
*inode
= file_inode(file
);
1916 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1917 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1918 struct btrfs_trans_handle
*trans
;
1923 if (!inode_owner_or_capable(inode
))
1926 ret
= mnt_want_write_file(file
);
1930 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
1932 goto out_drop_write
;
1935 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1937 goto out_drop_write
;
1940 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1942 goto out_drop_write
;
1945 down_write(&fs_info
->subvol_sem
);
1948 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1951 root_flags
= btrfs_root_flags(&root
->root_item
);
1952 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1953 btrfs_set_root_flags(&root
->root_item
,
1954 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1957 * Block RO -> RW transition if this subvolume is involved in
1960 spin_lock(&root
->root_item_lock
);
1961 if (root
->send_in_progress
== 0) {
1962 btrfs_set_root_flags(&root
->root_item
,
1963 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1964 spin_unlock(&root
->root_item_lock
);
1966 spin_unlock(&root
->root_item_lock
);
1968 "Attempt to set subvolume %llu read-write during send",
1969 root
->root_key
.objectid
);
1975 trans
= btrfs_start_transaction(root
, 1);
1976 if (IS_ERR(trans
)) {
1977 ret
= PTR_ERR(trans
);
1981 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
1982 &root
->root_key
, &root
->root_item
);
1984 btrfs_end_transaction(trans
);
1988 ret
= btrfs_commit_transaction(trans
);
1992 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1994 up_write(&fs_info
->subvol_sem
);
1996 mnt_drop_write_file(file
);
2001 static noinline
int key_in_sk(struct btrfs_key
*key
,
2002 struct btrfs_ioctl_search_key
*sk
)
2004 struct btrfs_key test
;
2007 test
.objectid
= sk
->min_objectid
;
2008 test
.type
= sk
->min_type
;
2009 test
.offset
= sk
->min_offset
;
2011 ret
= btrfs_comp_cpu_keys(key
, &test
);
2015 test
.objectid
= sk
->max_objectid
;
2016 test
.type
= sk
->max_type
;
2017 test
.offset
= sk
->max_offset
;
2019 ret
= btrfs_comp_cpu_keys(key
, &test
);
2025 static noinline
int copy_to_sk(struct btrfs_path
*path
,
2026 struct btrfs_key
*key
,
2027 struct btrfs_ioctl_search_key
*sk
,
2030 unsigned long *sk_offset
,
2034 struct extent_buffer
*leaf
;
2035 struct btrfs_ioctl_search_header sh
;
2036 struct btrfs_key test
;
2037 unsigned long item_off
;
2038 unsigned long item_len
;
2044 leaf
= path
->nodes
[0];
2045 slot
= path
->slots
[0];
2046 nritems
= btrfs_header_nritems(leaf
);
2048 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
2052 found_transid
= btrfs_header_generation(leaf
);
2054 for (i
= slot
; i
< nritems
; i
++) {
2055 item_off
= btrfs_item_ptr_offset(leaf
, i
);
2056 item_len
= btrfs_item_size_nr(leaf
, i
);
2058 btrfs_item_key_to_cpu(leaf
, key
, i
);
2059 if (!key_in_sk(key
, sk
))
2062 if (sizeof(sh
) + item_len
> *buf_size
) {
2069 * return one empty item back for v1, which does not
2073 *buf_size
= sizeof(sh
) + item_len
;
2078 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
2083 sh
.objectid
= key
->objectid
;
2084 sh
.offset
= key
->offset
;
2085 sh
.type
= key
->type
;
2087 sh
.transid
= found_transid
;
2089 /* copy search result header */
2090 if (copy_to_user(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
2095 *sk_offset
+= sizeof(sh
);
2098 char __user
*up
= ubuf
+ *sk_offset
;
2100 if (read_extent_buffer_to_user(leaf
, up
,
2101 item_off
, item_len
)) {
2106 *sk_offset
+= item_len
;
2110 if (ret
) /* -EOVERFLOW from above */
2113 if (*num_found
>= sk
->nr_items
) {
2120 test
.objectid
= sk
->max_objectid
;
2121 test
.type
= sk
->max_type
;
2122 test
.offset
= sk
->max_offset
;
2123 if (btrfs_comp_cpu_keys(key
, &test
) >= 0)
2125 else if (key
->offset
< (u64
)-1)
2127 else if (key
->type
< (u8
)-1) {
2130 } else if (key
->objectid
< (u64
)-1) {
2138 * 0: all items from this leaf copied, continue with next
2139 * 1: * more items can be copied, but unused buffer is too small
2140 * * all items were found
2141 * Either way, it will stops the loop which iterates to the next
2143 * -EOVERFLOW: item was to large for buffer
2144 * -EFAULT: could not copy extent buffer back to userspace
2149 static noinline
int search_ioctl(struct inode
*inode
,
2150 struct btrfs_ioctl_search_key
*sk
,
2154 struct btrfs_fs_info
*info
= btrfs_sb(inode
->i_sb
);
2155 struct btrfs_root
*root
;
2156 struct btrfs_key key
;
2157 struct btrfs_path
*path
;
2160 unsigned long sk_offset
= 0;
2162 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2163 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2167 path
= btrfs_alloc_path();
2171 if (sk
->tree_id
== 0) {
2172 /* search the root of the inode that was passed */
2173 root
= btrfs_grab_root(BTRFS_I(inode
)->root
);
2175 root
= btrfs_get_fs_root(info
, sk
->tree_id
, true);
2177 btrfs_free_path(path
);
2178 return PTR_ERR(root
);
2182 key
.objectid
= sk
->min_objectid
;
2183 key
.type
= sk
->min_type
;
2184 key
.offset
= sk
->min_offset
;
2187 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2193 ret
= copy_to_sk(path
, &key
, sk
, buf_size
, ubuf
,
2194 &sk_offset
, &num_found
);
2195 btrfs_release_path(path
);
2203 sk
->nr_items
= num_found
;
2204 btrfs_put_root(root
);
2205 btrfs_free_path(path
);
2209 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2212 struct btrfs_ioctl_search_args __user
*uargs
;
2213 struct btrfs_ioctl_search_key sk
;
2214 struct inode
*inode
;
2218 if (!capable(CAP_SYS_ADMIN
))
2221 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2223 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2226 buf_size
= sizeof(uargs
->buf
);
2228 inode
= file_inode(file
);
2229 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2232 * In the origin implementation an overflow is handled by returning a
2233 * search header with a len of zero, so reset ret.
2235 if (ret
== -EOVERFLOW
)
2238 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2243 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2246 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2247 struct btrfs_ioctl_search_args_v2 args
;
2248 struct inode
*inode
;
2251 const size_t buf_limit
= SZ_16M
;
2253 if (!capable(CAP_SYS_ADMIN
))
2256 /* copy search header and buffer size */
2257 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2258 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2261 buf_size
= args
.buf_size
;
2263 /* limit result size to 16MB */
2264 if (buf_size
> buf_limit
)
2265 buf_size
= buf_limit
;
2267 inode
= file_inode(file
);
2268 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2269 (char __user
*)(&uarg
->buf
[0]));
2270 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2272 else if (ret
== -EOVERFLOW
&&
2273 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2280 * Search INODE_REFs to identify path name of 'dirid' directory
2281 * in a 'tree_id' tree. and sets path name to 'name'.
2283 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2284 u64 tree_id
, u64 dirid
, char *name
)
2286 struct btrfs_root
*root
;
2287 struct btrfs_key key
;
2293 struct btrfs_inode_ref
*iref
;
2294 struct extent_buffer
*l
;
2295 struct btrfs_path
*path
;
2297 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2302 path
= btrfs_alloc_path();
2306 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
- 1];
2308 root
= btrfs_get_fs_root(info
, tree_id
, true);
2310 ret
= PTR_ERR(root
);
2315 key
.objectid
= dirid
;
2316 key
.type
= BTRFS_INODE_REF_KEY
;
2317 key
.offset
= (u64
)-1;
2320 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2324 ret
= btrfs_previous_item(root
, path
, dirid
,
2325 BTRFS_INODE_REF_KEY
);
2335 slot
= path
->slots
[0];
2336 btrfs_item_key_to_cpu(l
, &key
, slot
);
2338 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2339 len
= btrfs_inode_ref_name_len(l
, iref
);
2341 total_len
+= len
+ 1;
2343 ret
= -ENAMETOOLONG
;
2348 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2350 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2353 btrfs_release_path(path
);
2354 key
.objectid
= key
.offset
;
2355 key
.offset
= (u64
)-1;
2356 dirid
= key
.objectid
;
2358 memmove(name
, ptr
, total_len
);
2359 name
[total_len
] = '\0';
2362 btrfs_put_root(root
);
2363 btrfs_free_path(path
);
2367 static int btrfs_search_path_in_tree_user(struct inode
*inode
,
2368 struct btrfs_ioctl_ino_lookup_user_args
*args
)
2370 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2371 struct super_block
*sb
= inode
->i_sb
;
2372 struct btrfs_key upper_limit
= BTRFS_I(inode
)->location
;
2373 u64 treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2374 u64 dirid
= args
->dirid
;
2375 unsigned long item_off
;
2376 unsigned long item_len
;
2377 struct btrfs_inode_ref
*iref
;
2378 struct btrfs_root_ref
*rref
;
2379 struct btrfs_root
*root
= NULL
;
2380 struct btrfs_path
*path
;
2381 struct btrfs_key key
, key2
;
2382 struct extent_buffer
*leaf
;
2383 struct inode
*temp_inode
;
2390 path
= btrfs_alloc_path();
2395 * If the bottom subvolume does not exist directly under upper_limit,
2396 * construct the path in from the bottom up.
2398 if (dirid
!= upper_limit
.objectid
) {
2399 ptr
= &args
->path
[BTRFS_INO_LOOKUP_USER_PATH_MAX
- 1];
2401 root
= btrfs_get_fs_root(fs_info
, treeid
, true);
2403 ret
= PTR_ERR(root
);
2407 key
.objectid
= dirid
;
2408 key
.type
= BTRFS_INODE_REF_KEY
;
2409 key
.offset
= (u64
)-1;
2411 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2414 } else if (ret
> 0) {
2415 ret
= btrfs_previous_item(root
, path
, dirid
,
2416 BTRFS_INODE_REF_KEY
);
2419 } else if (ret
> 0) {
2425 leaf
= path
->nodes
[0];
2426 slot
= path
->slots
[0];
2427 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2429 iref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_inode_ref
);
2430 len
= btrfs_inode_ref_name_len(leaf
, iref
);
2432 total_len
+= len
+ 1;
2433 if (ptr
< args
->path
) {
2434 ret
= -ENAMETOOLONG
;
2439 read_extent_buffer(leaf
, ptr
,
2440 (unsigned long)(iref
+ 1), len
);
2442 /* Check the read+exec permission of this directory */
2443 ret
= btrfs_previous_item(root
, path
, dirid
,
2444 BTRFS_INODE_ITEM_KEY
);
2447 } else if (ret
> 0) {
2452 leaf
= path
->nodes
[0];
2453 slot
= path
->slots
[0];
2454 btrfs_item_key_to_cpu(leaf
, &key2
, slot
);
2455 if (key2
.objectid
!= dirid
) {
2460 temp_inode
= btrfs_iget(sb
, key2
.objectid
, root
);
2461 if (IS_ERR(temp_inode
)) {
2462 ret
= PTR_ERR(temp_inode
);
2465 ret
= inode_permission(temp_inode
, MAY_READ
| MAY_EXEC
);
2472 if (key
.offset
== upper_limit
.objectid
)
2474 if (key
.objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2479 btrfs_release_path(path
);
2480 key
.objectid
= key
.offset
;
2481 key
.offset
= (u64
)-1;
2482 dirid
= key
.objectid
;
2485 memmove(args
->path
, ptr
, total_len
);
2486 args
->path
[total_len
] = '\0';
2487 btrfs_put_root(root
);
2489 btrfs_release_path(path
);
2492 /* Get the bottom subvolume's name from ROOT_REF */
2493 key
.objectid
= treeid
;
2494 key
.type
= BTRFS_ROOT_REF_KEY
;
2495 key
.offset
= args
->treeid
;
2496 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
2499 } else if (ret
> 0) {
2504 leaf
= path
->nodes
[0];
2505 slot
= path
->slots
[0];
2506 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2508 item_off
= btrfs_item_ptr_offset(leaf
, slot
);
2509 item_len
= btrfs_item_size_nr(leaf
, slot
);
2510 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2511 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2512 if (args
->dirid
!= btrfs_root_ref_dirid(leaf
, rref
)) {
2517 /* Copy subvolume's name */
2518 item_off
+= sizeof(struct btrfs_root_ref
);
2519 item_len
-= sizeof(struct btrfs_root_ref
);
2520 read_extent_buffer(leaf
, args
->name
, item_off
, item_len
);
2521 args
->name
[item_len
] = 0;
2524 btrfs_put_root(root
);
2526 btrfs_free_path(path
);
2530 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2533 struct btrfs_ioctl_ino_lookup_args
*args
;
2534 struct inode
*inode
;
2537 args
= memdup_user(argp
, sizeof(*args
));
2539 return PTR_ERR(args
);
2541 inode
= file_inode(file
);
2544 * Unprivileged query to obtain the containing subvolume root id. The
2545 * path is reset so it's consistent with btrfs_search_path_in_tree.
2547 if (args
->treeid
== 0)
2548 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2550 if (args
->objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2555 if (!capable(CAP_SYS_ADMIN
)) {
2560 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2561 args
->treeid
, args
->objectid
,
2565 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2573 * Version of ino_lookup ioctl (unprivileged)
2575 * The main differences from ino_lookup ioctl are:
2577 * 1. Read + Exec permission will be checked using inode_permission() during
2578 * path construction. -EACCES will be returned in case of failure.
2579 * 2. Path construction will be stopped at the inode number which corresponds
2580 * to the fd with which this ioctl is called. If constructed path does not
2581 * exist under fd's inode, -EACCES will be returned.
2582 * 3. The name of bottom subvolume is also searched and filled.
2584 static int btrfs_ioctl_ino_lookup_user(struct file
*file
, void __user
*argp
)
2586 struct btrfs_ioctl_ino_lookup_user_args
*args
;
2587 struct inode
*inode
;
2590 args
= memdup_user(argp
, sizeof(*args
));
2592 return PTR_ERR(args
);
2594 inode
= file_inode(file
);
2596 if (args
->dirid
== BTRFS_FIRST_FREE_OBJECTID
&&
2597 BTRFS_I(inode
)->location
.objectid
!= BTRFS_FIRST_FREE_OBJECTID
) {
2599 * The subvolume does not exist under fd with which this is
2606 ret
= btrfs_search_path_in_tree_user(inode
, args
);
2608 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2615 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2616 static int btrfs_ioctl_get_subvol_info(struct file
*file
, void __user
*argp
)
2618 struct btrfs_ioctl_get_subvol_info_args
*subvol_info
;
2619 struct btrfs_fs_info
*fs_info
;
2620 struct btrfs_root
*root
;
2621 struct btrfs_path
*path
;
2622 struct btrfs_key key
;
2623 struct btrfs_root_item
*root_item
;
2624 struct btrfs_root_ref
*rref
;
2625 struct extent_buffer
*leaf
;
2626 unsigned long item_off
;
2627 unsigned long item_len
;
2628 struct inode
*inode
;
2632 path
= btrfs_alloc_path();
2636 subvol_info
= kzalloc(sizeof(*subvol_info
), GFP_KERNEL
);
2638 btrfs_free_path(path
);
2642 inode
= file_inode(file
);
2643 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2645 /* Get root_item of inode's subvolume */
2646 key
.objectid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2647 root
= btrfs_get_fs_root(fs_info
, key
.objectid
, true);
2649 ret
= PTR_ERR(root
);
2652 root_item
= &root
->root_item
;
2654 subvol_info
->treeid
= key
.objectid
;
2656 subvol_info
->generation
= btrfs_root_generation(root_item
);
2657 subvol_info
->flags
= btrfs_root_flags(root_item
);
2659 memcpy(subvol_info
->uuid
, root_item
->uuid
, BTRFS_UUID_SIZE
);
2660 memcpy(subvol_info
->parent_uuid
, root_item
->parent_uuid
,
2662 memcpy(subvol_info
->received_uuid
, root_item
->received_uuid
,
2665 subvol_info
->ctransid
= btrfs_root_ctransid(root_item
);
2666 subvol_info
->ctime
.sec
= btrfs_stack_timespec_sec(&root_item
->ctime
);
2667 subvol_info
->ctime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->ctime
);
2669 subvol_info
->otransid
= btrfs_root_otransid(root_item
);
2670 subvol_info
->otime
.sec
= btrfs_stack_timespec_sec(&root_item
->otime
);
2671 subvol_info
->otime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->otime
);
2673 subvol_info
->stransid
= btrfs_root_stransid(root_item
);
2674 subvol_info
->stime
.sec
= btrfs_stack_timespec_sec(&root_item
->stime
);
2675 subvol_info
->stime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->stime
);
2677 subvol_info
->rtransid
= btrfs_root_rtransid(root_item
);
2678 subvol_info
->rtime
.sec
= btrfs_stack_timespec_sec(&root_item
->rtime
);
2679 subvol_info
->rtime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->rtime
);
2681 if (key
.objectid
!= BTRFS_FS_TREE_OBJECTID
) {
2682 /* Search root tree for ROOT_BACKREF of this subvolume */
2683 key
.type
= BTRFS_ROOT_BACKREF_KEY
;
2685 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
2688 } else if (path
->slots
[0] >=
2689 btrfs_header_nritems(path
->nodes
[0])) {
2690 ret
= btrfs_next_leaf(fs_info
->tree_root
, path
);
2693 } else if (ret
> 0) {
2699 leaf
= path
->nodes
[0];
2700 slot
= path
->slots
[0];
2701 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2702 if (key
.objectid
== subvol_info
->treeid
&&
2703 key
.type
== BTRFS_ROOT_BACKREF_KEY
) {
2704 subvol_info
->parent_id
= key
.offset
;
2706 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2707 subvol_info
->dirid
= btrfs_root_ref_dirid(leaf
, rref
);
2709 item_off
= btrfs_item_ptr_offset(leaf
, slot
)
2710 + sizeof(struct btrfs_root_ref
);
2711 item_len
= btrfs_item_size_nr(leaf
, slot
)
2712 - sizeof(struct btrfs_root_ref
);
2713 read_extent_buffer(leaf
, subvol_info
->name
,
2714 item_off
, item_len
);
2721 if (copy_to_user(argp
, subvol_info
, sizeof(*subvol_info
)))
2725 btrfs_put_root(root
);
2727 btrfs_free_path(path
);
2733 * Return ROOT_REF information of the subvolume containing this inode
2734 * except the subvolume name.
2736 static int btrfs_ioctl_get_subvol_rootref(struct file
*file
, void __user
*argp
)
2738 struct btrfs_ioctl_get_subvol_rootref_args
*rootrefs
;
2739 struct btrfs_root_ref
*rref
;
2740 struct btrfs_root
*root
;
2741 struct btrfs_path
*path
;
2742 struct btrfs_key key
;
2743 struct extent_buffer
*leaf
;
2744 struct inode
*inode
;
2750 path
= btrfs_alloc_path();
2754 rootrefs
= memdup_user(argp
, sizeof(*rootrefs
));
2755 if (IS_ERR(rootrefs
)) {
2756 btrfs_free_path(path
);
2757 return PTR_ERR(rootrefs
);
2760 inode
= file_inode(file
);
2761 root
= BTRFS_I(inode
)->root
->fs_info
->tree_root
;
2762 objectid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2764 key
.objectid
= objectid
;
2765 key
.type
= BTRFS_ROOT_REF_KEY
;
2766 key
.offset
= rootrefs
->min_treeid
;
2769 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2772 } else if (path
->slots
[0] >=
2773 btrfs_header_nritems(path
->nodes
[0])) {
2774 ret
= btrfs_next_leaf(root
, path
);
2777 } else if (ret
> 0) {
2783 leaf
= path
->nodes
[0];
2784 slot
= path
->slots
[0];
2786 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2787 if (key
.objectid
!= objectid
|| key
.type
!= BTRFS_ROOT_REF_KEY
) {
2792 if (found
== BTRFS_MAX_ROOTREF_BUFFER_NUM
) {
2797 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2798 rootrefs
->rootref
[found
].treeid
= key
.offset
;
2799 rootrefs
->rootref
[found
].dirid
=
2800 btrfs_root_ref_dirid(leaf
, rref
);
2803 ret
= btrfs_next_item(root
, path
);
2806 } else if (ret
> 0) {
2813 if (!ret
|| ret
== -EOVERFLOW
) {
2814 rootrefs
->num_items
= found
;
2815 /* update min_treeid for next search */
2817 rootrefs
->min_treeid
=
2818 rootrefs
->rootref
[found
- 1].treeid
+ 1;
2819 if (copy_to_user(argp
, rootrefs
, sizeof(*rootrefs
)))
2824 btrfs_free_path(path
);
2829 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2833 struct dentry
*parent
= file
->f_path
.dentry
;
2834 struct btrfs_fs_info
*fs_info
= btrfs_sb(parent
->d_sb
);
2835 struct dentry
*dentry
;
2836 struct inode
*dir
= d_inode(parent
);
2837 struct inode
*inode
;
2838 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2839 struct btrfs_root
*dest
= NULL
;
2840 struct btrfs_ioctl_vol_args
*vol_args
= NULL
;
2841 struct btrfs_ioctl_vol_args_v2
*vol_args2
= NULL
;
2842 char *subvol_name
, *subvol_name_ptr
= NULL
;
2845 bool destroy_parent
= false;
2848 vol_args2
= memdup_user(arg
, sizeof(*vol_args2
));
2849 if (IS_ERR(vol_args2
))
2850 return PTR_ERR(vol_args2
);
2852 if (vol_args2
->flags
& ~BTRFS_SUBVOL_DELETE_ARGS_MASK
) {
2858 * If SPEC_BY_ID is not set, we are looking for the subvolume by
2859 * name, same as v1 currently does.
2861 if (!(vol_args2
->flags
& BTRFS_SUBVOL_SPEC_BY_ID
)) {
2862 vol_args2
->name
[BTRFS_SUBVOL_NAME_MAX
] = 0;
2863 subvol_name
= vol_args2
->name
;
2865 err
= mnt_want_write_file(file
);
2869 if (vol_args2
->subvolid
< BTRFS_FIRST_FREE_OBJECTID
) {
2874 err
= mnt_want_write_file(file
);
2878 dentry
= btrfs_get_dentry(fs_info
->sb
,
2879 BTRFS_FIRST_FREE_OBJECTID
,
2880 vol_args2
->subvolid
, 0, 0);
2881 if (IS_ERR(dentry
)) {
2882 err
= PTR_ERR(dentry
);
2883 goto out_drop_write
;
2887 * Change the default parent since the subvolume being
2888 * deleted can be outside of the current mount point.
2890 parent
= btrfs_get_parent(dentry
);
2893 * At this point dentry->d_name can point to '/' if the
2894 * subvolume we want to destroy is outsite of the
2895 * current mount point, so we need to release the
2896 * current dentry and execute the lookup to return a new
2897 * one with ->d_name pointing to the
2898 * <mount point>/subvol_name.
2901 if (IS_ERR(parent
)) {
2902 err
= PTR_ERR(parent
);
2903 goto out_drop_write
;
2905 dir
= d_inode(parent
);
2908 * If v2 was used with SPEC_BY_ID, a new parent was
2909 * allocated since the subvolume can be outside of the
2910 * current mount point. Later on we need to release this
2911 * new parent dentry.
2913 destroy_parent
= true;
2915 subvol_name_ptr
= btrfs_get_subvol_name_from_objectid(
2916 fs_info
, vol_args2
->subvolid
);
2917 if (IS_ERR(subvol_name_ptr
)) {
2918 err
= PTR_ERR(subvol_name_ptr
);
2921 /* subvol_name_ptr is already NULL termined */
2922 subvol_name
= (char *)kbasename(subvol_name_ptr
);
2925 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2926 if (IS_ERR(vol_args
))
2927 return PTR_ERR(vol_args
);
2929 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = 0;
2930 subvol_name
= vol_args
->name
;
2932 err
= mnt_want_write_file(file
);
2937 subvol_namelen
= strlen(subvol_name
);
2939 if (strchr(subvol_name
, '/') ||
2940 strncmp(subvol_name
, "..", subvol_namelen
) == 0) {
2942 goto free_subvol_name
;
2945 if (!S_ISDIR(dir
->i_mode
)) {
2947 goto free_subvol_name
;
2950 err
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
2952 goto free_subvol_name
;
2953 dentry
= lookup_one_len(subvol_name
, parent
, subvol_namelen
);
2954 if (IS_ERR(dentry
)) {
2955 err
= PTR_ERR(dentry
);
2956 goto out_unlock_dir
;
2959 if (d_really_is_negative(dentry
)) {
2964 inode
= d_inode(dentry
);
2965 dest
= BTRFS_I(inode
)->root
;
2966 if (!capable(CAP_SYS_ADMIN
)) {
2968 * Regular user. Only allow this with a special mount
2969 * option, when the user has write+exec access to the
2970 * subvol root, and when rmdir(2) would have been
2973 * Note that this is _not_ check that the subvol is
2974 * empty or doesn't contain data that we wouldn't
2975 * otherwise be able to delete.
2977 * Users who want to delete empty subvols should try
2981 if (!btrfs_test_opt(fs_info
, USER_SUBVOL_RM_ALLOWED
))
2985 * Do not allow deletion if the parent dir is the same
2986 * as the dir to be deleted. That means the ioctl
2987 * must be called on the dentry referencing the root
2988 * of the subvol, not a random directory contained
2995 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
3000 /* check if subvolume may be deleted by a user */
3001 err
= btrfs_may_delete(dir
, dentry
, 1);
3005 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
3011 err
= btrfs_delete_subvolume(dir
, dentry
);
3012 inode_unlock(inode
);
3014 fsnotify_rmdir(dir
, dentry
);
3023 kfree(subvol_name_ptr
);
3028 mnt_drop_write_file(file
);
3035 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
3037 struct inode
*inode
= file_inode(file
);
3038 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3039 struct btrfs_ioctl_defrag_range_args
*range
;
3042 ret
= mnt_want_write_file(file
);
3046 if (btrfs_root_readonly(root
)) {
3051 switch (inode
->i_mode
& S_IFMT
) {
3053 if (!capable(CAP_SYS_ADMIN
)) {
3057 ret
= btrfs_defrag_root(root
);
3061 * Note that this does not check the file descriptor for write
3062 * access. This prevents defragmenting executables that are
3063 * running and allows defrag on files open in read-only mode.
3065 if (!capable(CAP_SYS_ADMIN
) &&
3066 inode_permission(inode
, MAY_WRITE
)) {
3071 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
3078 if (copy_from_user(range
, argp
,
3084 /* compression requires us to start the IO */
3085 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
3086 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
3087 range
->extent_thresh
= (u32
)-1;
3090 /* the rest are all set to zero by kzalloc */
3091 range
->len
= (u64
)-1;
3093 ret
= btrfs_defrag_file(file_inode(file
), file
,
3094 range
, BTRFS_OLDEST_GENERATION
, 0);
3103 mnt_drop_write_file(file
);
3107 static long btrfs_ioctl_add_dev(struct btrfs_fs_info
*fs_info
, void __user
*arg
)
3109 struct btrfs_ioctl_vol_args
*vol_args
;
3112 if (!capable(CAP_SYS_ADMIN
))
3115 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
))
3116 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3118 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3119 if (IS_ERR(vol_args
)) {
3120 ret
= PTR_ERR(vol_args
);
3124 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
3125 ret
= btrfs_init_new_device(fs_info
, vol_args
->name
);
3128 btrfs_info(fs_info
, "disk added %s", vol_args
->name
);
3132 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3136 static long btrfs_ioctl_rm_dev_v2(struct file
*file
, void __user
*arg
)
3138 struct inode
*inode
= file_inode(file
);
3139 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3140 struct btrfs_ioctl_vol_args_v2
*vol_args
;
3143 if (!capable(CAP_SYS_ADMIN
))
3146 ret
= mnt_want_write_file(file
);
3150 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3151 if (IS_ERR(vol_args
)) {
3152 ret
= PTR_ERR(vol_args
);
3156 if (vol_args
->flags
& ~BTRFS_DEVICE_REMOVE_ARGS_MASK
) {
3161 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
3162 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3166 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
) {
3167 ret
= btrfs_rm_device(fs_info
, NULL
, vol_args
->devid
);
3169 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
3170 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0);
3172 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3175 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
)
3176 btrfs_info(fs_info
, "device deleted: id %llu",
3179 btrfs_info(fs_info
, "device deleted: %s",
3185 mnt_drop_write_file(file
);
3189 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
3191 struct inode
*inode
= file_inode(file
);
3192 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3193 struct btrfs_ioctl_vol_args
*vol_args
;
3196 if (!capable(CAP_SYS_ADMIN
))
3199 ret
= mnt_want_write_file(file
);
3203 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
3204 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3205 goto out_drop_write
;
3208 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3209 if (IS_ERR(vol_args
)) {
3210 ret
= PTR_ERR(vol_args
);
3214 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
3215 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0);
3218 btrfs_info(fs_info
, "disk deleted %s", vol_args
->name
);
3221 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3223 mnt_drop_write_file(file
);
3228 static long btrfs_ioctl_fs_info(struct btrfs_fs_info
*fs_info
,
3231 struct btrfs_ioctl_fs_info_args
*fi_args
;
3232 struct btrfs_device
*device
;
3233 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
3237 fi_args
= memdup_user(arg
, sizeof(*fi_args
));
3238 if (IS_ERR(fi_args
))
3239 return PTR_ERR(fi_args
);
3241 flags_in
= fi_args
->flags
;
3242 memset(fi_args
, 0, sizeof(*fi_args
));
3245 fi_args
->num_devices
= fs_devices
->num_devices
;
3247 list_for_each_entry_rcu(device
, &fs_devices
->devices
, dev_list
) {
3248 if (device
->devid
> fi_args
->max_id
)
3249 fi_args
->max_id
= device
->devid
;
3253 memcpy(&fi_args
->fsid
, fs_devices
->fsid
, sizeof(fi_args
->fsid
));
3254 fi_args
->nodesize
= fs_info
->nodesize
;
3255 fi_args
->sectorsize
= fs_info
->sectorsize
;
3256 fi_args
->clone_alignment
= fs_info
->sectorsize
;
3258 if (flags_in
& BTRFS_FS_INFO_FLAG_CSUM_INFO
) {
3259 fi_args
->csum_type
= btrfs_super_csum_type(fs_info
->super_copy
);
3260 fi_args
->csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
3261 fi_args
->flags
|= BTRFS_FS_INFO_FLAG_CSUM_INFO
;
3264 if (flags_in
& BTRFS_FS_INFO_FLAG_GENERATION
) {
3265 fi_args
->generation
= fs_info
->generation
;
3266 fi_args
->flags
|= BTRFS_FS_INFO_FLAG_GENERATION
;
3269 if (flags_in
& BTRFS_FS_INFO_FLAG_METADATA_UUID
) {
3270 memcpy(&fi_args
->metadata_uuid
, fs_devices
->metadata_uuid
,
3271 sizeof(fi_args
->metadata_uuid
));
3272 fi_args
->flags
|= BTRFS_FS_INFO_FLAG_METADATA_UUID
;
3275 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
3282 static long btrfs_ioctl_dev_info(struct btrfs_fs_info
*fs_info
,
3285 struct btrfs_ioctl_dev_info_args
*di_args
;
3286 struct btrfs_device
*dev
;
3288 char *s_uuid
= NULL
;
3290 di_args
= memdup_user(arg
, sizeof(*di_args
));
3291 if (IS_ERR(di_args
))
3292 return PTR_ERR(di_args
);
3294 if (!btrfs_is_empty_uuid(di_args
->uuid
))
3295 s_uuid
= di_args
->uuid
;
3298 dev
= btrfs_find_device(fs_info
->fs_devices
, di_args
->devid
, s_uuid
,
3306 di_args
->devid
= dev
->devid
;
3307 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
3308 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
3309 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
3311 strncpy(di_args
->path
, rcu_str_deref(dev
->name
),
3312 sizeof(di_args
->path
) - 1);
3313 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
3315 di_args
->path
[0] = '\0';
3320 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
3327 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3329 struct inode
*inode
= file_inode(file
);
3330 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3331 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3332 struct btrfs_root
*new_root
;
3333 struct btrfs_dir_item
*di
;
3334 struct btrfs_trans_handle
*trans
;
3335 struct btrfs_path
*path
= NULL
;
3336 struct btrfs_disk_key disk_key
;
3341 if (!capable(CAP_SYS_ADMIN
))
3344 ret
= mnt_want_write_file(file
);
3348 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3354 objectid
= BTRFS_FS_TREE_OBJECTID
;
3356 new_root
= btrfs_get_fs_root(fs_info
, objectid
, true);
3357 if (IS_ERR(new_root
)) {
3358 ret
= PTR_ERR(new_root
);
3361 if (!is_fstree(new_root
->root_key
.objectid
)) {
3366 path
= btrfs_alloc_path();
3371 path
->leave_spinning
= 1;
3373 trans
= btrfs_start_transaction(root
, 1);
3374 if (IS_ERR(trans
)) {
3375 ret
= PTR_ERR(trans
);
3379 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
3380 di
= btrfs_lookup_dir_item(trans
, fs_info
->tree_root
, path
,
3381 dir_id
, "default", 7, 1);
3382 if (IS_ERR_OR_NULL(di
)) {
3383 btrfs_release_path(path
);
3384 btrfs_end_transaction(trans
);
3386 "Umm, you don't have the default diritem, this isn't going to work");
3391 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3392 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3393 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3394 btrfs_release_path(path
);
3396 btrfs_set_fs_incompat(fs_info
, DEFAULT_SUBVOL
);
3397 btrfs_end_transaction(trans
);
3399 btrfs_put_root(new_root
);
3400 btrfs_free_path(path
);
3402 mnt_drop_write_file(file
);
3406 static void get_block_group_info(struct list_head
*groups_list
,
3407 struct btrfs_ioctl_space_info
*space
)
3409 struct btrfs_block_group
*block_group
;
3411 space
->total_bytes
= 0;
3412 space
->used_bytes
= 0;
3414 list_for_each_entry(block_group
, groups_list
, list
) {
3415 space
->flags
= block_group
->flags
;
3416 space
->total_bytes
+= block_group
->length
;
3417 space
->used_bytes
+= block_group
->used
;
3421 static long btrfs_ioctl_space_info(struct btrfs_fs_info
*fs_info
,
3424 struct btrfs_ioctl_space_args space_args
;
3425 struct btrfs_ioctl_space_info space
;
3426 struct btrfs_ioctl_space_info
*dest
;
3427 struct btrfs_ioctl_space_info
*dest_orig
;
3428 struct btrfs_ioctl_space_info __user
*user_dest
;
3429 struct btrfs_space_info
*info
;
3430 static const u64 types
[] = {
3431 BTRFS_BLOCK_GROUP_DATA
,
3432 BTRFS_BLOCK_GROUP_SYSTEM
,
3433 BTRFS_BLOCK_GROUP_METADATA
,
3434 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
3442 if (copy_from_user(&space_args
,
3443 (struct btrfs_ioctl_space_args __user
*)arg
,
3444 sizeof(space_args
)))
3447 for (i
= 0; i
< num_types
; i
++) {
3448 struct btrfs_space_info
*tmp
;
3452 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
,
3454 if (tmp
->flags
== types
[i
]) {
3464 down_read(&info
->groups_sem
);
3465 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3466 if (!list_empty(&info
->block_groups
[c
]))
3469 up_read(&info
->groups_sem
);
3473 * Global block reserve, exported as a space_info
3477 /* space_slots == 0 means they are asking for a count */
3478 if (space_args
.space_slots
== 0) {
3479 space_args
.total_spaces
= slot_count
;
3483 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
3485 alloc_size
= sizeof(*dest
) * slot_count
;
3487 /* we generally have at most 6 or so space infos, one for each raid
3488 * level. So, a whole page should be more than enough for everyone
3490 if (alloc_size
> PAGE_SIZE
)
3493 space_args
.total_spaces
= 0;
3494 dest
= kmalloc(alloc_size
, GFP_KERNEL
);
3499 /* now we have a buffer to copy into */
3500 for (i
= 0; i
< num_types
; i
++) {
3501 struct btrfs_space_info
*tmp
;
3508 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
,
3510 if (tmp
->flags
== types
[i
]) {
3519 down_read(&info
->groups_sem
);
3520 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3521 if (!list_empty(&info
->block_groups
[c
])) {
3522 get_block_group_info(&info
->block_groups
[c
],
3524 memcpy(dest
, &space
, sizeof(space
));
3526 space_args
.total_spaces
++;
3532 up_read(&info
->groups_sem
);
3536 * Add global block reserve
3539 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
3541 spin_lock(&block_rsv
->lock
);
3542 space
.total_bytes
= block_rsv
->size
;
3543 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
3544 spin_unlock(&block_rsv
->lock
);
3545 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
3546 memcpy(dest
, &space
, sizeof(space
));
3547 space_args
.total_spaces
++;
3550 user_dest
= (struct btrfs_ioctl_space_info __user
*)
3551 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
3553 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
3558 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
3564 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
3567 struct btrfs_trans_handle
*trans
;
3571 trans
= btrfs_attach_transaction_barrier(root
);
3572 if (IS_ERR(trans
)) {
3573 if (PTR_ERR(trans
) != -ENOENT
)
3574 return PTR_ERR(trans
);
3576 /* No running transaction, don't bother */
3577 transid
= root
->fs_info
->last_trans_committed
;
3580 transid
= trans
->transid
;
3581 ret
= btrfs_commit_transaction_async(trans
, 0);
3583 btrfs_end_transaction(trans
);
3588 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
3593 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_fs_info
*fs_info
,
3599 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
3602 transid
= 0; /* current trans */
3604 return btrfs_wait_for_commit(fs_info
, transid
);
3607 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
3609 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
3610 struct btrfs_ioctl_scrub_args
*sa
;
3613 if (!capable(CAP_SYS_ADMIN
))
3616 sa
= memdup_user(arg
, sizeof(*sa
));
3620 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
3621 ret
= mnt_want_write_file(file
);
3626 ret
= btrfs_scrub_dev(fs_info
, sa
->devid
, sa
->start
, sa
->end
,
3627 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
3631 * Copy scrub args to user space even if btrfs_scrub_dev() returned an
3632 * error. This is important as it allows user space to know how much
3633 * progress scrub has done. For example, if scrub is canceled we get
3634 * -ECANCELED from btrfs_scrub_dev() and return that error back to user
3635 * space. Later user space can inspect the progress from the structure
3636 * btrfs_ioctl_scrub_args and resume scrub from where it left off
3637 * previously (btrfs-progs does this).
3638 * If we fail to copy the btrfs_ioctl_scrub_args structure to user space
3639 * then return -EFAULT to signal the structure was not copied or it may
3640 * be corrupt and unreliable due to a partial copy.
3642 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3645 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
3646 mnt_drop_write_file(file
);
3652 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info
*fs_info
)
3654 if (!capable(CAP_SYS_ADMIN
))
3657 return btrfs_scrub_cancel(fs_info
);
3660 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info
*fs_info
,
3663 struct btrfs_ioctl_scrub_args
*sa
;
3666 if (!capable(CAP_SYS_ADMIN
))
3669 sa
= memdup_user(arg
, sizeof(*sa
));
3673 ret
= btrfs_scrub_progress(fs_info
, sa
->devid
, &sa
->progress
);
3675 if (ret
== 0 && copy_to_user(arg
, sa
, sizeof(*sa
)))
3682 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info
*fs_info
,
3685 struct btrfs_ioctl_get_dev_stats
*sa
;
3688 sa
= memdup_user(arg
, sizeof(*sa
));
3692 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
3697 ret
= btrfs_get_dev_stats(fs_info
, sa
);
3699 if (ret
== 0 && copy_to_user(arg
, sa
, sizeof(*sa
)))
3706 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info
*fs_info
,
3709 struct btrfs_ioctl_dev_replace_args
*p
;
3712 if (!capable(CAP_SYS_ADMIN
))
3715 p
= memdup_user(arg
, sizeof(*p
));
3720 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
3721 if (sb_rdonly(fs_info
->sb
)) {
3725 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
3726 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3728 ret
= btrfs_dev_replace_by_ioctl(fs_info
, p
);
3729 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3732 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
3733 btrfs_dev_replace_status(fs_info
, p
);
3736 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
3737 p
->result
= btrfs_dev_replace_cancel(fs_info
);
3745 if ((ret
== 0 || ret
== -ECANCELED
) && copy_to_user(arg
, p
, sizeof(*p
)))
3752 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
3758 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
3759 struct inode_fs_paths
*ipath
= NULL
;
3760 struct btrfs_path
*path
;
3762 if (!capable(CAP_DAC_READ_SEARCH
))
3765 path
= btrfs_alloc_path();
3771 ipa
= memdup_user(arg
, sizeof(*ipa
));
3778 size
= min_t(u32
, ipa
->size
, 4096);
3779 ipath
= init_ipath(size
, root
, path
);
3780 if (IS_ERR(ipath
)) {
3781 ret
= PTR_ERR(ipath
);
3786 ret
= paths_from_inode(ipa
->inum
, ipath
);
3790 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
3791 rel_ptr
= ipath
->fspath
->val
[i
] -
3792 (u64
)(unsigned long)ipath
->fspath
->val
;
3793 ipath
->fspath
->val
[i
] = rel_ptr
;
3796 ret
= copy_to_user((void __user
*)(unsigned long)ipa
->fspath
,
3797 ipath
->fspath
, size
);
3804 btrfs_free_path(path
);
3811 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
3813 struct btrfs_data_container
*inodes
= ctx
;
3814 const size_t c
= 3 * sizeof(u64
);
3816 if (inodes
->bytes_left
>= c
) {
3817 inodes
->bytes_left
-= c
;
3818 inodes
->val
[inodes
->elem_cnt
] = inum
;
3819 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
3820 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
3821 inodes
->elem_cnt
+= 3;
3823 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
3824 inodes
->bytes_left
= 0;
3825 inodes
->elem_missed
+= 3;
3831 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info
*fs_info
,
3832 void __user
*arg
, int version
)
3836 struct btrfs_ioctl_logical_ino_args
*loi
;
3837 struct btrfs_data_container
*inodes
= NULL
;
3838 struct btrfs_path
*path
= NULL
;
3841 if (!capable(CAP_SYS_ADMIN
))
3844 loi
= memdup_user(arg
, sizeof(*loi
));
3846 return PTR_ERR(loi
);
3849 ignore_offset
= false;
3850 size
= min_t(u32
, loi
->size
, SZ_64K
);
3852 /* All reserved bits must be 0 for now */
3853 if (memchr_inv(loi
->reserved
, 0, sizeof(loi
->reserved
))) {
3857 /* Only accept flags we have defined so far */
3858 if (loi
->flags
& ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET
)) {
3862 ignore_offset
= loi
->flags
& BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET
;
3863 size
= min_t(u32
, loi
->size
, SZ_16M
);
3866 path
= btrfs_alloc_path();
3872 inodes
= init_data_container(size
);
3873 if (IS_ERR(inodes
)) {
3874 ret
= PTR_ERR(inodes
);
3879 ret
= iterate_inodes_from_logical(loi
->logical
, fs_info
, path
,
3880 build_ino_list
, inodes
, ignore_offset
);
3886 ret
= copy_to_user((void __user
*)(unsigned long)loi
->inodes
, inodes
,
3892 btrfs_free_path(path
);
3900 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
,
3901 struct btrfs_ioctl_balance_args
*bargs
)
3903 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3905 bargs
->flags
= bctl
->flags
;
3907 if (test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
))
3908 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
3909 if (atomic_read(&fs_info
->balance_pause_req
))
3910 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
3911 if (atomic_read(&fs_info
->balance_cancel_req
))
3912 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
3914 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
3915 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
3916 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
3918 spin_lock(&fs_info
->balance_lock
);
3919 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
3920 spin_unlock(&fs_info
->balance_lock
);
3923 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
3925 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
3926 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3927 struct btrfs_ioctl_balance_args
*bargs
;
3928 struct btrfs_balance_control
*bctl
;
3929 bool need_unlock
; /* for mut. excl. ops lock */
3932 if (!capable(CAP_SYS_ADMIN
))
3935 ret
= mnt_want_write_file(file
);
3940 if (!test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
3941 mutex_lock(&fs_info
->balance_mutex
);
3947 * mut. excl. ops lock is locked. Three possibilities:
3948 * (1) some other op is running
3949 * (2) balance is running
3950 * (3) balance is paused -- special case (think resume)
3952 mutex_lock(&fs_info
->balance_mutex
);
3953 if (fs_info
->balance_ctl
) {
3954 /* this is either (2) or (3) */
3955 if (!test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
3956 mutex_unlock(&fs_info
->balance_mutex
);
3958 * Lock released to allow other waiters to continue,
3959 * we'll reexamine the status again.
3961 mutex_lock(&fs_info
->balance_mutex
);
3963 if (fs_info
->balance_ctl
&&
3964 !test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
3966 need_unlock
= false;
3970 mutex_unlock(&fs_info
->balance_mutex
);
3974 mutex_unlock(&fs_info
->balance_mutex
);
3980 mutex_unlock(&fs_info
->balance_mutex
);
3981 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3986 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
));
3989 bargs
= memdup_user(arg
, sizeof(*bargs
));
3990 if (IS_ERR(bargs
)) {
3991 ret
= PTR_ERR(bargs
);
3995 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
3996 if (!fs_info
->balance_ctl
) {
4001 bctl
= fs_info
->balance_ctl
;
4002 spin_lock(&fs_info
->balance_lock
);
4003 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4004 spin_unlock(&fs_info
->balance_lock
);
4012 if (fs_info
->balance_ctl
) {
4017 bctl
= kzalloc(sizeof(*bctl
), GFP_KERNEL
);
4024 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4025 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4026 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4028 bctl
->flags
= bargs
->flags
;
4030 /* balance everything - no filters */
4031 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4034 if (bctl
->flags
& ~(BTRFS_BALANCE_ARGS_MASK
| BTRFS_BALANCE_TYPE_MASK
)) {
4041 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
4042 * btrfs_balance. bctl is freed in reset_balance_state, or, if
4043 * restriper was paused all the way until unmount, in free_fs_info.
4044 * The flag should be cleared after reset_balance_state.
4046 need_unlock
= false;
4048 ret
= btrfs_balance(fs_info
, bctl
, bargs
);
4051 if ((ret
== 0 || ret
== -ECANCELED
) && arg
) {
4052 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4061 mutex_unlock(&fs_info
->balance_mutex
);
4063 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
4065 mnt_drop_write_file(file
);
4069 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info
*fs_info
, int cmd
)
4071 if (!capable(CAP_SYS_ADMIN
))
4075 case BTRFS_BALANCE_CTL_PAUSE
:
4076 return btrfs_pause_balance(fs_info
);
4077 case BTRFS_BALANCE_CTL_CANCEL
:
4078 return btrfs_cancel_balance(fs_info
);
4084 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info
*fs_info
,
4087 struct btrfs_ioctl_balance_args
*bargs
;
4090 if (!capable(CAP_SYS_ADMIN
))
4093 mutex_lock(&fs_info
->balance_mutex
);
4094 if (!fs_info
->balance_ctl
) {
4099 bargs
= kzalloc(sizeof(*bargs
), GFP_KERNEL
);
4105 btrfs_update_ioctl_balance_args(fs_info
, bargs
);
4107 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4112 mutex_unlock(&fs_info
->balance_mutex
);
4116 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4118 struct inode
*inode
= file_inode(file
);
4119 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4120 struct btrfs_ioctl_quota_ctl_args
*sa
;
4123 if (!capable(CAP_SYS_ADMIN
))
4126 ret
= mnt_want_write_file(file
);
4130 sa
= memdup_user(arg
, sizeof(*sa
));
4136 down_write(&fs_info
->subvol_sem
);
4139 case BTRFS_QUOTA_CTL_ENABLE
:
4140 ret
= btrfs_quota_enable(fs_info
);
4142 case BTRFS_QUOTA_CTL_DISABLE
:
4143 ret
= btrfs_quota_disable(fs_info
);
4151 up_write(&fs_info
->subvol_sem
);
4153 mnt_drop_write_file(file
);
4157 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4159 struct inode
*inode
= file_inode(file
);
4160 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4161 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4162 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4163 struct btrfs_trans_handle
*trans
;
4167 if (!capable(CAP_SYS_ADMIN
))
4170 ret
= mnt_want_write_file(file
);
4174 sa
= memdup_user(arg
, sizeof(*sa
));
4180 trans
= btrfs_join_transaction(root
);
4181 if (IS_ERR(trans
)) {
4182 ret
= PTR_ERR(trans
);
4187 ret
= btrfs_add_qgroup_relation(trans
, sa
->src
, sa
->dst
);
4189 ret
= btrfs_del_qgroup_relation(trans
, sa
->src
, sa
->dst
);
4192 /* update qgroup status and info */
4193 err
= btrfs_run_qgroups(trans
);
4195 btrfs_handle_fs_error(fs_info
, err
,
4196 "failed to update qgroup status and info");
4197 err
= btrfs_end_transaction(trans
);
4204 mnt_drop_write_file(file
);
4208 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4210 struct inode
*inode
= file_inode(file
);
4211 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4212 struct btrfs_ioctl_qgroup_create_args
*sa
;
4213 struct btrfs_trans_handle
*trans
;
4217 if (!capable(CAP_SYS_ADMIN
))
4220 ret
= mnt_want_write_file(file
);
4224 sa
= memdup_user(arg
, sizeof(*sa
));
4230 if (!sa
->qgroupid
) {
4235 trans
= btrfs_join_transaction(root
);
4236 if (IS_ERR(trans
)) {
4237 ret
= PTR_ERR(trans
);
4242 ret
= btrfs_create_qgroup(trans
, sa
->qgroupid
);
4244 ret
= btrfs_remove_qgroup(trans
, sa
->qgroupid
);
4247 err
= btrfs_end_transaction(trans
);
4254 mnt_drop_write_file(file
);
4258 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4260 struct inode
*inode
= file_inode(file
);
4261 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4262 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4263 struct btrfs_trans_handle
*trans
;
4268 if (!capable(CAP_SYS_ADMIN
))
4271 ret
= mnt_want_write_file(file
);
4275 sa
= memdup_user(arg
, sizeof(*sa
));
4281 trans
= btrfs_join_transaction(root
);
4282 if (IS_ERR(trans
)) {
4283 ret
= PTR_ERR(trans
);
4287 qgroupid
= sa
->qgroupid
;
4289 /* take the current subvol as qgroup */
4290 qgroupid
= root
->root_key
.objectid
;
4293 ret
= btrfs_limit_qgroup(trans
, qgroupid
, &sa
->lim
);
4295 err
= btrfs_end_transaction(trans
);
4302 mnt_drop_write_file(file
);
4306 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4308 struct inode
*inode
= file_inode(file
);
4309 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4310 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4313 if (!capable(CAP_SYS_ADMIN
))
4316 ret
= mnt_want_write_file(file
);
4320 qsa
= memdup_user(arg
, sizeof(*qsa
));
4331 ret
= btrfs_qgroup_rescan(fs_info
);
4336 mnt_drop_write_file(file
);
4340 static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info
*fs_info
,
4343 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4346 if (!capable(CAP_SYS_ADMIN
))
4349 qsa
= kzalloc(sizeof(*qsa
), GFP_KERNEL
);
4353 if (fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4355 qsa
->progress
= fs_info
->qgroup_rescan_progress
.objectid
;
4358 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
4365 static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info
*fs_info
,
4368 if (!capable(CAP_SYS_ADMIN
))
4371 return btrfs_qgroup_wait_for_completion(fs_info
, true);
4374 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
4375 struct btrfs_ioctl_received_subvol_args
*sa
)
4377 struct inode
*inode
= file_inode(file
);
4378 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4379 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4380 struct btrfs_root_item
*root_item
= &root
->root_item
;
4381 struct btrfs_trans_handle
*trans
;
4382 struct timespec64 ct
= current_time(inode
);
4384 int received_uuid_changed
;
4386 if (!inode_owner_or_capable(inode
))
4389 ret
= mnt_want_write_file(file
);
4393 down_write(&fs_info
->subvol_sem
);
4395 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
4400 if (btrfs_root_readonly(root
)) {
4407 * 2 - uuid items (received uuid + subvol uuid)
4409 trans
= btrfs_start_transaction(root
, 3);
4410 if (IS_ERR(trans
)) {
4411 ret
= PTR_ERR(trans
);
4416 sa
->rtransid
= trans
->transid
;
4417 sa
->rtime
.sec
= ct
.tv_sec
;
4418 sa
->rtime
.nsec
= ct
.tv_nsec
;
4420 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4422 if (received_uuid_changed
&&
4423 !btrfs_is_empty_uuid(root_item
->received_uuid
)) {
4424 ret
= btrfs_uuid_tree_remove(trans
, root_item
->received_uuid
,
4425 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4426 root
->root_key
.objectid
);
4427 if (ret
&& ret
!= -ENOENT
) {
4428 btrfs_abort_transaction(trans
, ret
);
4429 btrfs_end_transaction(trans
);
4433 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4434 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4435 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4436 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4437 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4438 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4439 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
4441 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
4442 &root
->root_key
, &root
->root_item
);
4444 btrfs_end_transaction(trans
);
4447 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
4448 ret
= btrfs_uuid_tree_add(trans
, sa
->uuid
,
4449 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4450 root
->root_key
.objectid
);
4451 if (ret
< 0 && ret
!= -EEXIST
) {
4452 btrfs_abort_transaction(trans
, ret
);
4453 btrfs_end_transaction(trans
);
4457 ret
= btrfs_commit_transaction(trans
);
4459 up_write(&fs_info
->subvol_sem
);
4460 mnt_drop_write_file(file
);
4465 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
4468 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
4469 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
4472 args32
= memdup_user(arg
, sizeof(*args32
));
4474 return PTR_ERR(args32
);
4476 args64
= kmalloc(sizeof(*args64
), GFP_KERNEL
);
4482 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
4483 args64
->stransid
= args32
->stransid
;
4484 args64
->rtransid
= args32
->rtransid
;
4485 args64
->stime
.sec
= args32
->stime
.sec
;
4486 args64
->stime
.nsec
= args32
->stime
.nsec
;
4487 args64
->rtime
.sec
= args32
->rtime
.sec
;
4488 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
4489 args64
->flags
= args32
->flags
;
4491 ret
= _btrfs_ioctl_set_received_subvol(file
, args64
);
4495 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
4496 args32
->stransid
= args64
->stransid
;
4497 args32
->rtransid
= args64
->rtransid
;
4498 args32
->stime
.sec
= args64
->stime
.sec
;
4499 args32
->stime
.nsec
= args64
->stime
.nsec
;
4500 args32
->rtime
.sec
= args64
->rtime
.sec
;
4501 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
4502 args32
->flags
= args64
->flags
;
4504 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
4515 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
4518 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
4521 sa
= memdup_user(arg
, sizeof(*sa
));
4525 ret
= _btrfs_ioctl_set_received_subvol(file
, sa
);
4530 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
4539 static int btrfs_ioctl_get_fslabel(struct btrfs_fs_info
*fs_info
,
4544 char label
[BTRFS_LABEL_SIZE
];
4546 spin_lock(&fs_info
->super_lock
);
4547 memcpy(label
, fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
4548 spin_unlock(&fs_info
->super_lock
);
4550 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
4552 if (len
== BTRFS_LABEL_SIZE
) {
4554 "label is too long, return the first %zu bytes",
4558 ret
= copy_to_user(arg
, label
, len
);
4560 return ret
? -EFAULT
: 0;
4563 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
4565 struct inode
*inode
= file_inode(file
);
4566 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4567 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4568 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
4569 struct btrfs_trans_handle
*trans
;
4570 char label
[BTRFS_LABEL_SIZE
];
4573 if (!capable(CAP_SYS_ADMIN
))
4576 if (copy_from_user(label
, arg
, sizeof(label
)))
4579 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
4581 "unable to set label with more than %d bytes",
4582 BTRFS_LABEL_SIZE
- 1);
4586 ret
= mnt_want_write_file(file
);
4590 trans
= btrfs_start_transaction(root
, 0);
4591 if (IS_ERR(trans
)) {
4592 ret
= PTR_ERR(trans
);
4596 spin_lock(&fs_info
->super_lock
);
4597 strcpy(super_block
->label
, label
);
4598 spin_unlock(&fs_info
->super_lock
);
4599 ret
= btrfs_commit_transaction(trans
);
4602 mnt_drop_write_file(file
);
4606 #define INIT_FEATURE_FLAGS(suffix) \
4607 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4608 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4609 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4611 int btrfs_ioctl_get_supported_features(void __user
*arg
)
4613 static const struct btrfs_ioctl_feature_flags features
[3] = {
4614 INIT_FEATURE_FLAGS(SUPP
),
4615 INIT_FEATURE_FLAGS(SAFE_SET
),
4616 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
4619 if (copy_to_user(arg
, &features
, sizeof(features
)))
4625 static int btrfs_ioctl_get_features(struct btrfs_fs_info
*fs_info
,
4628 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
4629 struct btrfs_ioctl_feature_flags features
;
4631 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
4632 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
4633 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
4635 if (copy_to_user(arg
, &features
, sizeof(features
)))
4641 static int check_feature_bits(struct btrfs_fs_info
*fs_info
,
4642 enum btrfs_feature_set set
,
4643 u64 change_mask
, u64 flags
, u64 supported_flags
,
4644 u64 safe_set
, u64 safe_clear
)
4646 const char *type
= btrfs_feature_set_name(set
);
4648 u64 disallowed
, unsupported
;
4649 u64 set_mask
= flags
& change_mask
;
4650 u64 clear_mask
= ~flags
& change_mask
;
4652 unsupported
= set_mask
& ~supported_flags
;
4654 names
= btrfs_printable_features(set
, unsupported
);
4657 "this kernel does not support the %s feature bit%s",
4658 names
, strchr(names
, ',') ? "s" : "");
4662 "this kernel does not support %s bits 0x%llx",
4667 disallowed
= set_mask
& ~safe_set
;
4669 names
= btrfs_printable_features(set
, disallowed
);
4672 "can't set the %s feature bit%s while mounted",
4673 names
, strchr(names
, ',') ? "s" : "");
4677 "can't set %s bits 0x%llx while mounted",
4682 disallowed
= clear_mask
& ~safe_clear
;
4684 names
= btrfs_printable_features(set
, disallowed
);
4687 "can't clear the %s feature bit%s while mounted",
4688 names
, strchr(names
, ',') ? "s" : "");
4692 "can't clear %s bits 0x%llx while mounted",
4700 #define check_feature(fs_info, change_mask, flags, mask_base) \
4701 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
4702 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4703 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4704 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4706 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
4708 struct inode
*inode
= file_inode(file
);
4709 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4710 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4711 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
4712 struct btrfs_ioctl_feature_flags flags
[2];
4713 struct btrfs_trans_handle
*trans
;
4717 if (!capable(CAP_SYS_ADMIN
))
4720 if (copy_from_user(flags
, arg
, sizeof(flags
)))
4724 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
4725 !flags
[0].incompat_flags
)
4728 ret
= check_feature(fs_info
, flags
[0].compat_flags
,
4729 flags
[1].compat_flags
, COMPAT
);
4733 ret
= check_feature(fs_info
, flags
[0].compat_ro_flags
,
4734 flags
[1].compat_ro_flags
, COMPAT_RO
);
4738 ret
= check_feature(fs_info
, flags
[0].incompat_flags
,
4739 flags
[1].incompat_flags
, INCOMPAT
);
4743 ret
= mnt_want_write_file(file
);
4747 trans
= btrfs_start_transaction(root
, 0);
4748 if (IS_ERR(trans
)) {
4749 ret
= PTR_ERR(trans
);
4750 goto out_drop_write
;
4753 spin_lock(&fs_info
->super_lock
);
4754 newflags
= btrfs_super_compat_flags(super_block
);
4755 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
4756 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
4757 btrfs_set_super_compat_flags(super_block
, newflags
);
4759 newflags
= btrfs_super_compat_ro_flags(super_block
);
4760 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
4761 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
4762 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
4764 newflags
= btrfs_super_incompat_flags(super_block
);
4765 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
4766 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
4767 btrfs_set_super_incompat_flags(super_block
, newflags
);
4768 spin_unlock(&fs_info
->super_lock
);
4770 ret
= btrfs_commit_transaction(trans
);
4772 mnt_drop_write_file(file
);
4777 static int _btrfs_ioctl_send(struct file
*file
, void __user
*argp
, bool compat
)
4779 struct btrfs_ioctl_send_args
*arg
;
4783 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4784 struct btrfs_ioctl_send_args_32 args32
;
4786 ret
= copy_from_user(&args32
, argp
, sizeof(args32
));
4789 arg
= kzalloc(sizeof(*arg
), GFP_KERNEL
);
4792 arg
->send_fd
= args32
.send_fd
;
4793 arg
->clone_sources_count
= args32
.clone_sources_count
;
4794 arg
->clone_sources
= compat_ptr(args32
.clone_sources
);
4795 arg
->parent_root
= args32
.parent_root
;
4796 arg
->flags
= args32
.flags
;
4797 memcpy(arg
->reserved
, args32
.reserved
,
4798 sizeof(args32
.reserved
));
4803 arg
= memdup_user(argp
, sizeof(*arg
));
4805 return PTR_ERR(arg
);
4807 ret
= btrfs_ioctl_send(file
, arg
);
4812 long btrfs_ioctl(struct file
*file
, unsigned int
4813 cmd
, unsigned long arg
)
4815 struct inode
*inode
= file_inode(file
);
4816 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4817 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4818 void __user
*argp
= (void __user
*)arg
;
4821 case FS_IOC_GETFLAGS
:
4822 return btrfs_ioctl_getflags(file
, argp
);
4823 case FS_IOC_SETFLAGS
:
4824 return btrfs_ioctl_setflags(file
, argp
);
4825 case FS_IOC_GETVERSION
:
4826 return btrfs_ioctl_getversion(file
, argp
);
4827 case FS_IOC_GETFSLABEL
:
4828 return btrfs_ioctl_get_fslabel(fs_info
, argp
);
4829 case FS_IOC_SETFSLABEL
:
4830 return btrfs_ioctl_set_fslabel(file
, argp
);
4832 return btrfs_ioctl_fitrim(fs_info
, argp
);
4833 case BTRFS_IOC_SNAP_CREATE
:
4834 return btrfs_ioctl_snap_create(file
, argp
, 0);
4835 case BTRFS_IOC_SNAP_CREATE_V2
:
4836 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
4837 case BTRFS_IOC_SUBVOL_CREATE
:
4838 return btrfs_ioctl_snap_create(file
, argp
, 1);
4839 case BTRFS_IOC_SUBVOL_CREATE_V2
:
4840 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
4841 case BTRFS_IOC_SNAP_DESTROY
:
4842 return btrfs_ioctl_snap_destroy(file
, argp
, false);
4843 case BTRFS_IOC_SNAP_DESTROY_V2
:
4844 return btrfs_ioctl_snap_destroy(file
, argp
, true);
4845 case BTRFS_IOC_SUBVOL_GETFLAGS
:
4846 return btrfs_ioctl_subvol_getflags(file
, argp
);
4847 case BTRFS_IOC_SUBVOL_SETFLAGS
:
4848 return btrfs_ioctl_subvol_setflags(file
, argp
);
4849 case BTRFS_IOC_DEFAULT_SUBVOL
:
4850 return btrfs_ioctl_default_subvol(file
, argp
);
4851 case BTRFS_IOC_DEFRAG
:
4852 return btrfs_ioctl_defrag(file
, NULL
);
4853 case BTRFS_IOC_DEFRAG_RANGE
:
4854 return btrfs_ioctl_defrag(file
, argp
);
4855 case BTRFS_IOC_RESIZE
:
4856 return btrfs_ioctl_resize(file
, argp
);
4857 case BTRFS_IOC_ADD_DEV
:
4858 return btrfs_ioctl_add_dev(fs_info
, argp
);
4859 case BTRFS_IOC_RM_DEV
:
4860 return btrfs_ioctl_rm_dev(file
, argp
);
4861 case BTRFS_IOC_RM_DEV_V2
:
4862 return btrfs_ioctl_rm_dev_v2(file
, argp
);
4863 case BTRFS_IOC_FS_INFO
:
4864 return btrfs_ioctl_fs_info(fs_info
, argp
);
4865 case BTRFS_IOC_DEV_INFO
:
4866 return btrfs_ioctl_dev_info(fs_info
, argp
);
4867 case BTRFS_IOC_BALANCE
:
4868 return btrfs_ioctl_balance(file
, NULL
);
4869 case BTRFS_IOC_TREE_SEARCH
:
4870 return btrfs_ioctl_tree_search(file
, argp
);
4871 case BTRFS_IOC_TREE_SEARCH_V2
:
4872 return btrfs_ioctl_tree_search_v2(file
, argp
);
4873 case BTRFS_IOC_INO_LOOKUP
:
4874 return btrfs_ioctl_ino_lookup(file
, argp
);
4875 case BTRFS_IOC_INO_PATHS
:
4876 return btrfs_ioctl_ino_to_path(root
, argp
);
4877 case BTRFS_IOC_LOGICAL_INO
:
4878 return btrfs_ioctl_logical_to_ino(fs_info
, argp
, 1);
4879 case BTRFS_IOC_LOGICAL_INO_V2
:
4880 return btrfs_ioctl_logical_to_ino(fs_info
, argp
, 2);
4881 case BTRFS_IOC_SPACE_INFO
:
4882 return btrfs_ioctl_space_info(fs_info
, argp
);
4883 case BTRFS_IOC_SYNC
: {
4886 ret
= btrfs_start_delalloc_roots(fs_info
, -1);
4889 ret
= btrfs_sync_fs(inode
->i_sb
, 1);
4891 * The transaction thread may want to do more work,
4892 * namely it pokes the cleaner kthread that will start
4893 * processing uncleaned subvols.
4895 wake_up_process(fs_info
->transaction_kthread
);
4898 case BTRFS_IOC_START_SYNC
:
4899 return btrfs_ioctl_start_sync(root
, argp
);
4900 case BTRFS_IOC_WAIT_SYNC
:
4901 return btrfs_ioctl_wait_sync(fs_info
, argp
);
4902 case BTRFS_IOC_SCRUB
:
4903 return btrfs_ioctl_scrub(file
, argp
);
4904 case BTRFS_IOC_SCRUB_CANCEL
:
4905 return btrfs_ioctl_scrub_cancel(fs_info
);
4906 case BTRFS_IOC_SCRUB_PROGRESS
:
4907 return btrfs_ioctl_scrub_progress(fs_info
, argp
);
4908 case BTRFS_IOC_BALANCE_V2
:
4909 return btrfs_ioctl_balance(file
, argp
);
4910 case BTRFS_IOC_BALANCE_CTL
:
4911 return btrfs_ioctl_balance_ctl(fs_info
, arg
);
4912 case BTRFS_IOC_BALANCE_PROGRESS
:
4913 return btrfs_ioctl_balance_progress(fs_info
, argp
);
4914 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
4915 return btrfs_ioctl_set_received_subvol(file
, argp
);
4917 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
4918 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
4920 case BTRFS_IOC_SEND
:
4921 return _btrfs_ioctl_send(file
, argp
, false);
4922 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
4923 case BTRFS_IOC_SEND_32
:
4924 return _btrfs_ioctl_send(file
, argp
, true);
4926 case BTRFS_IOC_GET_DEV_STATS
:
4927 return btrfs_ioctl_get_dev_stats(fs_info
, argp
);
4928 case BTRFS_IOC_QUOTA_CTL
:
4929 return btrfs_ioctl_quota_ctl(file
, argp
);
4930 case BTRFS_IOC_QGROUP_ASSIGN
:
4931 return btrfs_ioctl_qgroup_assign(file
, argp
);
4932 case BTRFS_IOC_QGROUP_CREATE
:
4933 return btrfs_ioctl_qgroup_create(file
, argp
);
4934 case BTRFS_IOC_QGROUP_LIMIT
:
4935 return btrfs_ioctl_qgroup_limit(file
, argp
);
4936 case BTRFS_IOC_QUOTA_RESCAN
:
4937 return btrfs_ioctl_quota_rescan(file
, argp
);
4938 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
4939 return btrfs_ioctl_quota_rescan_status(fs_info
, argp
);
4940 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
4941 return btrfs_ioctl_quota_rescan_wait(fs_info
, argp
);
4942 case BTRFS_IOC_DEV_REPLACE
:
4943 return btrfs_ioctl_dev_replace(fs_info
, argp
);
4944 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
4945 return btrfs_ioctl_get_supported_features(argp
);
4946 case BTRFS_IOC_GET_FEATURES
:
4947 return btrfs_ioctl_get_features(fs_info
, argp
);
4948 case BTRFS_IOC_SET_FEATURES
:
4949 return btrfs_ioctl_set_features(file
, argp
);
4950 case FS_IOC_FSGETXATTR
:
4951 return btrfs_ioctl_fsgetxattr(file
, argp
);
4952 case FS_IOC_FSSETXATTR
:
4953 return btrfs_ioctl_fssetxattr(file
, argp
);
4954 case BTRFS_IOC_GET_SUBVOL_INFO
:
4955 return btrfs_ioctl_get_subvol_info(file
, argp
);
4956 case BTRFS_IOC_GET_SUBVOL_ROOTREF
:
4957 return btrfs_ioctl_get_subvol_rootref(file
, argp
);
4958 case BTRFS_IOC_INO_LOOKUP_USER
:
4959 return btrfs_ioctl_ino_lookup_user(file
, argp
);
4965 #ifdef CONFIG_COMPAT
4966 long btrfs_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
4969 * These all access 32-bit values anyway so no further
4970 * handling is necessary.
4973 case FS_IOC32_GETFLAGS
:
4974 cmd
= FS_IOC_GETFLAGS
;
4976 case FS_IOC32_SETFLAGS
:
4977 cmd
= FS_IOC_SETFLAGS
;
4979 case FS_IOC32_GETVERSION
:
4980 cmd
= FS_IOC_GETVERSION
;
4984 return btrfs_ioctl(file
, cmd
, (unsigned long) compat_ptr(arg
));