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>
31 #include "transaction.h"
32 #include "btrfs_inode.h"
33 #include "print-tree.h"
36 #include "inode-map.h"
38 #include "rcu-string.h"
40 #include "dev-replace.h"
45 #include "compression.h"
48 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
49 * structures are incorrect, as the timespec structure from userspace
50 * is 4 bytes too small. We define these alternatives here to teach
51 * the kernel about the 32-bit struct packing.
53 struct btrfs_ioctl_timespec_32
{
56 } __attribute__ ((__packed__
));
58 struct btrfs_ioctl_received_subvol_args_32
{
59 char uuid
[BTRFS_UUID_SIZE
]; /* in */
60 __u64 stransid
; /* in */
61 __u64 rtransid
; /* out */
62 struct btrfs_ioctl_timespec_32 stime
; /* in */
63 struct btrfs_ioctl_timespec_32 rtime
; /* out */
65 __u64 reserved
[16]; /* in */
66 } __attribute__ ((__packed__
));
68 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
69 struct btrfs_ioctl_received_subvol_args_32)
72 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
73 struct btrfs_ioctl_send_args_32
{
74 __s64 send_fd
; /* in */
75 __u64 clone_sources_count
; /* in */
76 compat_uptr_t clone_sources
; /* in */
77 __u64 parent_root
; /* in */
79 __u64 reserved
[4]; /* in */
80 } __attribute__ ((__packed__
));
82 #define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
83 struct btrfs_ioctl_send_args_32)
86 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
87 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
,
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
)))
167 /* Check if @flags are a supported and valid set of FS_*_FL flags */
168 static int check_fsflags(unsigned int flags
)
170 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
171 FS_NOATIME_FL
| FS_NODUMP_FL
| \
172 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
173 FS_NOCOMP_FL
| FS_COMPR_FL
|
177 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
183 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
185 struct inode
*inode
= file_inode(file
);
186 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
187 struct btrfs_inode
*binode
= BTRFS_I(inode
);
188 struct btrfs_root
*root
= binode
->root
;
189 struct btrfs_trans_handle
*trans
;
190 unsigned int fsflags
, old_fsflags
;
193 unsigned int old_i_flags
;
196 if (!inode_owner_or_capable(inode
))
199 if (btrfs_root_readonly(root
))
202 if (copy_from_user(&fsflags
, arg
, sizeof(fsflags
)))
205 ret
= check_fsflags(fsflags
);
209 ret
= mnt_want_write_file(file
);
215 old_flags
= binode
->flags
;
216 old_i_flags
= inode
->i_flags
;
217 mode
= inode
->i_mode
;
219 fsflags
= btrfs_mask_fsflags_for_type(inode
, fsflags
);
220 old_fsflags
= btrfs_inode_flags_to_fsflags(binode
->flags
);
221 if ((fsflags
^ old_fsflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
222 if (!capable(CAP_LINUX_IMMUTABLE
)) {
228 if (fsflags
& FS_SYNC_FL
)
229 binode
->flags
|= BTRFS_INODE_SYNC
;
231 binode
->flags
&= ~BTRFS_INODE_SYNC
;
232 if (fsflags
& FS_IMMUTABLE_FL
)
233 binode
->flags
|= BTRFS_INODE_IMMUTABLE
;
235 binode
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
236 if (fsflags
& FS_APPEND_FL
)
237 binode
->flags
|= BTRFS_INODE_APPEND
;
239 binode
->flags
&= ~BTRFS_INODE_APPEND
;
240 if (fsflags
& FS_NODUMP_FL
)
241 binode
->flags
|= BTRFS_INODE_NODUMP
;
243 binode
->flags
&= ~BTRFS_INODE_NODUMP
;
244 if (fsflags
& FS_NOATIME_FL
)
245 binode
->flags
|= BTRFS_INODE_NOATIME
;
247 binode
->flags
&= ~BTRFS_INODE_NOATIME
;
248 if (fsflags
& FS_DIRSYNC_FL
)
249 binode
->flags
|= BTRFS_INODE_DIRSYNC
;
251 binode
->flags
&= ~BTRFS_INODE_DIRSYNC
;
252 if (fsflags
& FS_NOCOW_FL
) {
255 * It's safe to turn csums off here, no extents exist.
256 * Otherwise we want the flag to reflect the real COW
257 * status of the file and will not set it.
259 if (inode
->i_size
== 0)
260 binode
->flags
|= BTRFS_INODE_NODATACOW
261 | BTRFS_INODE_NODATASUM
;
263 binode
->flags
|= BTRFS_INODE_NODATACOW
;
267 * Revert back under same assumptions as above
270 if (inode
->i_size
== 0)
271 binode
->flags
&= ~(BTRFS_INODE_NODATACOW
272 | BTRFS_INODE_NODATASUM
);
274 binode
->flags
&= ~BTRFS_INODE_NODATACOW
;
279 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
280 * flag may be changed automatically if compression code won't make
283 if (fsflags
& FS_NOCOMP_FL
) {
284 binode
->flags
&= ~BTRFS_INODE_COMPRESS
;
285 binode
->flags
|= BTRFS_INODE_NOCOMPRESS
;
287 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
288 if (ret
&& ret
!= -ENODATA
)
290 } else if (fsflags
& FS_COMPR_FL
) {
293 binode
->flags
|= BTRFS_INODE_COMPRESS
;
294 binode
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
296 comp
= btrfs_compress_type2str(fs_info
->compress_type
);
297 if (!comp
|| comp
[0] == 0)
298 comp
= btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB
);
300 ret
= btrfs_set_prop(inode
, "btrfs.compression",
301 comp
, strlen(comp
), 0);
306 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
307 if (ret
&& ret
!= -ENODATA
)
309 binode
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
312 trans
= btrfs_start_transaction(root
, 1);
314 ret
= PTR_ERR(trans
);
318 btrfs_sync_inode_flags_to_i_flags(inode
);
319 inode_inc_iversion(inode
);
320 inode
->i_ctime
= current_time(inode
);
321 ret
= btrfs_update_inode(trans
, root
, inode
);
323 btrfs_end_transaction(trans
);
326 binode
->flags
= old_flags
;
327 inode
->i_flags
= old_i_flags
;
332 mnt_drop_write_file(file
);
337 * Translate btrfs internal inode flags to xflags as expected by the
338 * FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
341 static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags
)
343 unsigned int xflags
= 0;
345 if (flags
& BTRFS_INODE_APPEND
)
346 xflags
|= FS_XFLAG_APPEND
;
347 if (flags
& BTRFS_INODE_IMMUTABLE
)
348 xflags
|= FS_XFLAG_IMMUTABLE
;
349 if (flags
& BTRFS_INODE_NOATIME
)
350 xflags
|= FS_XFLAG_NOATIME
;
351 if (flags
& BTRFS_INODE_NODUMP
)
352 xflags
|= FS_XFLAG_NODUMP
;
353 if (flags
& BTRFS_INODE_SYNC
)
354 xflags
|= FS_XFLAG_SYNC
;
359 /* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
360 static int check_xflags(unsigned int flags
)
362 if (flags
& ~(FS_XFLAG_APPEND
| FS_XFLAG_IMMUTABLE
| FS_XFLAG_NOATIME
|
363 FS_XFLAG_NODUMP
| FS_XFLAG_SYNC
))
369 * Set the xflags from the internal inode flags. The remaining items of fsxattr
372 static int btrfs_ioctl_fsgetxattr(struct file
*file
, void __user
*arg
)
374 struct btrfs_inode
*binode
= BTRFS_I(file_inode(file
));
377 memset(&fa
, 0, sizeof(fa
));
378 fa
.fsx_xflags
= btrfs_inode_flags_to_xflags(binode
->flags
);
380 if (copy_to_user(arg
, &fa
, sizeof(fa
)))
386 static int btrfs_ioctl_fssetxattr(struct file
*file
, void __user
*arg
)
388 struct inode
*inode
= file_inode(file
);
389 struct btrfs_inode
*binode
= BTRFS_I(inode
);
390 struct btrfs_root
*root
= binode
->root
;
391 struct btrfs_trans_handle
*trans
;
394 unsigned old_i_flags
;
397 if (!inode_owner_or_capable(inode
))
400 if (btrfs_root_readonly(root
))
403 memset(&fa
, 0, sizeof(fa
));
404 if (copy_from_user(&fa
, arg
, sizeof(fa
)))
407 ret
= check_xflags(fa
.fsx_xflags
);
411 if (fa
.fsx_extsize
!= 0 || fa
.fsx_projid
!= 0 || fa
.fsx_cowextsize
!= 0)
414 ret
= mnt_want_write_file(file
);
420 old_flags
= binode
->flags
;
421 old_i_flags
= inode
->i_flags
;
423 /* We need the capabilities to change append-only or immutable inode */
424 if (((old_flags
& (BTRFS_INODE_APPEND
| BTRFS_INODE_IMMUTABLE
)) ||
425 (fa
.fsx_xflags
& (FS_XFLAG_APPEND
| FS_XFLAG_IMMUTABLE
))) &&
426 !capable(CAP_LINUX_IMMUTABLE
)) {
431 if (fa
.fsx_xflags
& FS_XFLAG_SYNC
)
432 binode
->flags
|= BTRFS_INODE_SYNC
;
434 binode
->flags
&= ~BTRFS_INODE_SYNC
;
435 if (fa
.fsx_xflags
& FS_XFLAG_IMMUTABLE
)
436 binode
->flags
|= BTRFS_INODE_IMMUTABLE
;
438 binode
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
439 if (fa
.fsx_xflags
& FS_XFLAG_APPEND
)
440 binode
->flags
|= BTRFS_INODE_APPEND
;
442 binode
->flags
&= ~BTRFS_INODE_APPEND
;
443 if (fa
.fsx_xflags
& FS_XFLAG_NODUMP
)
444 binode
->flags
|= BTRFS_INODE_NODUMP
;
446 binode
->flags
&= ~BTRFS_INODE_NODUMP
;
447 if (fa
.fsx_xflags
& FS_XFLAG_NOATIME
)
448 binode
->flags
|= BTRFS_INODE_NOATIME
;
450 binode
->flags
&= ~BTRFS_INODE_NOATIME
;
452 /* 1 item for the inode */
453 trans
= btrfs_start_transaction(root
, 1);
455 ret
= PTR_ERR(trans
);
459 btrfs_sync_inode_flags_to_i_flags(inode
);
460 inode_inc_iversion(inode
);
461 inode
->i_ctime
= current_time(inode
);
462 ret
= btrfs_update_inode(trans
, root
, inode
);
464 btrfs_end_transaction(trans
);
468 binode
->flags
= old_flags
;
469 inode
->i_flags
= old_i_flags
;
473 mnt_drop_write_file(file
);
478 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
480 struct inode
*inode
= file_inode(file
);
482 return put_user(inode
->i_generation
, arg
);
485 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
487 struct inode
*inode
= file_inode(file
);
488 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
489 struct btrfs_device
*device
;
490 struct request_queue
*q
;
491 struct fstrim_range range
;
492 u64 minlen
= ULLONG_MAX
;
494 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
497 if (!capable(CAP_SYS_ADMIN
))
501 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
505 q
= bdev_get_queue(device
->bdev
);
506 if (blk_queue_discard(q
)) {
508 minlen
= min_t(u64
, q
->limits
.discard_granularity
,
516 if (copy_from_user(&range
, arg
, sizeof(range
)))
518 if (range
.start
> total_bytes
||
519 range
.len
< fs_info
->sb
->s_blocksize
)
522 range
.len
= min(range
.len
, total_bytes
- range
.start
);
523 range
.minlen
= max(range
.minlen
, minlen
);
524 ret
= btrfs_trim_fs(fs_info
, &range
);
528 if (copy_to_user(arg
, &range
, sizeof(range
)))
534 int btrfs_is_empty_uuid(u8
*uuid
)
538 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
545 static noinline
int create_subvol(struct inode
*dir
,
546 struct dentry
*dentry
,
547 const char *name
, int namelen
,
549 struct btrfs_qgroup_inherit
*inherit
)
551 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
552 struct btrfs_trans_handle
*trans
;
553 struct btrfs_key key
;
554 struct btrfs_root_item
*root_item
;
555 struct btrfs_inode_item
*inode_item
;
556 struct extent_buffer
*leaf
;
557 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
558 struct btrfs_root
*new_root
;
559 struct btrfs_block_rsv block_rsv
;
560 struct timespec64 cur_time
= current_time(dir
);
565 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
569 root_item
= kzalloc(sizeof(*root_item
), GFP_KERNEL
);
573 ret
= btrfs_find_free_objectid(fs_info
->tree_root
, &objectid
);
578 * Don't create subvolume whose level is not zero. Or qgroup will be
579 * screwed up since it assumes subvolume qgroup's level to be 0.
581 if (btrfs_qgroup_level(objectid
)) {
586 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
588 * The same as the snapshot creation, please see the comment
589 * of create_snapshot().
591 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
, 8, false);
595 trans
= btrfs_start_transaction(root
, 0);
597 ret
= PTR_ERR(trans
);
598 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
);
601 trans
->block_rsv
= &block_rsv
;
602 trans
->bytes_reserved
= block_rsv
.size
;
604 ret
= btrfs_qgroup_inherit(trans
, 0, objectid
, inherit
);
608 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
614 btrfs_mark_buffer_dirty(leaf
);
616 inode_item
= &root_item
->inode
;
617 btrfs_set_stack_inode_generation(inode_item
, 1);
618 btrfs_set_stack_inode_size(inode_item
, 3);
619 btrfs_set_stack_inode_nlink(inode_item
, 1);
620 btrfs_set_stack_inode_nbytes(inode_item
,
622 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
624 btrfs_set_root_flags(root_item
, 0);
625 btrfs_set_root_limit(root_item
, 0);
626 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
628 btrfs_set_root_bytenr(root_item
, leaf
->start
);
629 btrfs_set_root_generation(root_item
, trans
->transid
);
630 btrfs_set_root_level(root_item
, 0);
631 btrfs_set_root_refs(root_item
, 1);
632 btrfs_set_root_used(root_item
, leaf
->len
);
633 btrfs_set_root_last_snapshot(root_item
, 0);
635 btrfs_set_root_generation_v2(root_item
,
636 btrfs_root_generation(root_item
));
637 uuid_le_gen(&new_uuid
);
638 memcpy(root_item
->uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
639 btrfs_set_stack_timespec_sec(&root_item
->otime
, cur_time
.tv_sec
);
640 btrfs_set_stack_timespec_nsec(&root_item
->otime
, cur_time
.tv_nsec
);
641 root_item
->ctime
= root_item
->otime
;
642 btrfs_set_root_ctransid(root_item
, trans
->transid
);
643 btrfs_set_root_otransid(root_item
, trans
->transid
);
645 btrfs_tree_unlock(leaf
);
646 free_extent_buffer(leaf
);
649 btrfs_set_root_dirid(root_item
, new_dirid
);
651 key
.objectid
= objectid
;
653 key
.type
= BTRFS_ROOT_ITEM_KEY
;
654 ret
= btrfs_insert_root(trans
, fs_info
->tree_root
, &key
,
659 key
.offset
= (u64
)-1;
660 new_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
661 if (IS_ERR(new_root
)) {
662 ret
= PTR_ERR(new_root
);
663 btrfs_abort_transaction(trans
, ret
);
667 btrfs_record_root_in_trans(trans
, new_root
);
669 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, new_dirid
);
671 /* We potentially lose an unused inode item here */
672 btrfs_abort_transaction(trans
, ret
);
676 mutex_lock(&new_root
->objectid_mutex
);
677 new_root
->highest_objectid
= new_dirid
;
678 mutex_unlock(&new_root
->objectid_mutex
);
681 * insert the directory item
683 ret
= btrfs_set_inode_index(BTRFS_I(dir
), &index
);
685 btrfs_abort_transaction(trans
, ret
);
689 ret
= btrfs_insert_dir_item(trans
, root
,
690 name
, namelen
, BTRFS_I(dir
), &key
,
691 BTRFS_FT_DIR
, index
);
693 btrfs_abort_transaction(trans
, ret
);
697 btrfs_i_size_write(BTRFS_I(dir
), dir
->i_size
+ namelen
* 2);
698 ret
= btrfs_update_inode(trans
, root
, dir
);
701 ret
= btrfs_add_root_ref(trans
, objectid
, root
->root_key
.objectid
,
702 btrfs_ino(BTRFS_I(dir
)), index
, name
, namelen
);
705 ret
= btrfs_uuid_tree_add(trans
, root_item
->uuid
,
706 BTRFS_UUID_KEY_SUBVOL
, objectid
);
708 btrfs_abort_transaction(trans
, ret
);
712 trans
->block_rsv
= NULL
;
713 trans
->bytes_reserved
= 0;
714 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
);
717 *async_transid
= trans
->transid
;
718 err
= btrfs_commit_transaction_async(trans
, 1);
720 err
= btrfs_commit_transaction(trans
);
722 err
= btrfs_commit_transaction(trans
);
728 inode
= btrfs_lookup_dentry(dir
, dentry
);
730 return PTR_ERR(inode
);
731 d_instantiate(dentry
, inode
);
740 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
741 struct dentry
*dentry
,
742 u64
*async_transid
, bool readonly
,
743 struct btrfs_qgroup_inherit
*inherit
)
745 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
747 struct btrfs_pending_snapshot
*pending_snapshot
;
748 struct btrfs_trans_handle
*trans
;
750 bool snapshot_force_cow
= false;
752 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
755 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_KERNEL
);
756 if (!pending_snapshot
)
759 pending_snapshot
->root_item
= kzalloc(sizeof(struct btrfs_root_item
),
761 pending_snapshot
->path
= btrfs_alloc_path();
762 if (!pending_snapshot
->root_item
|| !pending_snapshot
->path
) {
768 * Force new buffered writes to reserve space even when NOCOW is
769 * possible. This is to avoid later writeback (running dealloc) to
770 * fallback to COW mode and unexpectedly fail with ENOSPC.
772 atomic_inc(&root
->will_be_snapshotted
);
773 smp_mb__after_atomic();
774 /* wait for no snapshot writes */
775 wait_event(root
->subv_writers
->wait
,
776 percpu_counter_sum(&root
->subv_writers
->counter
) == 0);
778 ret
= btrfs_start_delalloc_inodes(root
);
783 * All previous writes have started writeback in NOCOW mode, so now
784 * we force future writes to fallback to COW mode during snapshot
787 atomic_inc(&root
->snapshot_force_cow
);
788 snapshot_force_cow
= true;
790 btrfs_wait_ordered_extents(root
, U64_MAX
, 0, (u64
)-1);
792 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
793 BTRFS_BLOCK_RSV_TEMP
);
795 * 1 - parent dir inode
798 * 2 - root ref/backref
799 * 1 - root of snapshot
802 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
803 &pending_snapshot
->block_rsv
, 8,
808 pending_snapshot
->dentry
= dentry
;
809 pending_snapshot
->root
= root
;
810 pending_snapshot
->readonly
= readonly
;
811 pending_snapshot
->dir
= dir
;
812 pending_snapshot
->inherit
= inherit
;
814 trans
= btrfs_start_transaction(root
, 0);
816 ret
= PTR_ERR(trans
);
820 spin_lock(&fs_info
->trans_lock
);
821 list_add(&pending_snapshot
->list
,
822 &trans
->transaction
->pending_snapshots
);
823 spin_unlock(&fs_info
->trans_lock
);
825 *async_transid
= trans
->transid
;
826 ret
= btrfs_commit_transaction_async(trans
, 1);
828 ret
= btrfs_commit_transaction(trans
);
830 ret
= btrfs_commit_transaction(trans
);
835 ret
= pending_snapshot
->error
;
839 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
843 inode
= btrfs_lookup_dentry(d_inode(dentry
->d_parent
), dentry
);
845 ret
= PTR_ERR(inode
);
849 d_instantiate(dentry
, inode
);
852 btrfs_subvolume_release_metadata(fs_info
, &pending_snapshot
->block_rsv
);
854 if (snapshot_force_cow
)
855 atomic_dec(&root
->snapshot_force_cow
);
856 if (atomic_dec_and_test(&root
->will_be_snapshotted
))
857 wake_up_var(&root
->will_be_snapshotted
);
859 kfree(pending_snapshot
->root_item
);
860 btrfs_free_path(pending_snapshot
->path
);
861 kfree(pending_snapshot
);
866 /* copy of may_delete in fs/namei.c()
867 * Check whether we can remove a link victim from directory dir, check
868 * whether the type of victim is right.
869 * 1. We can't do it if dir is read-only (done in permission())
870 * 2. We should have write and exec permissions on dir
871 * 3. We can't remove anything from append-only dir
872 * 4. We can't do anything with immutable dir (done in permission())
873 * 5. If the sticky bit on dir is set we should either
874 * a. be owner of dir, or
875 * b. be owner of victim, or
876 * c. have CAP_FOWNER capability
877 * 6. If the victim is append-only or immutable we can't do anything with
878 * links pointing to it.
879 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
880 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
881 * 9. We can't remove a root or mountpoint.
882 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
883 * nfs_async_unlink().
886 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
890 if (d_really_is_negative(victim
))
893 BUG_ON(d_inode(victim
->d_parent
) != dir
);
894 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
896 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
901 if (check_sticky(dir
, d_inode(victim
)) || IS_APPEND(d_inode(victim
)) ||
902 IS_IMMUTABLE(d_inode(victim
)) || IS_SWAPFILE(d_inode(victim
)))
905 if (!d_is_dir(victim
))
909 } else if (d_is_dir(victim
))
913 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
918 /* copy of may_create in fs/namei.c() */
919 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
921 if (d_really_is_positive(child
))
925 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
929 * Create a new subvolume below @parent. This is largely modeled after
930 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
931 * inside this filesystem so it's quite a bit simpler.
933 static noinline
int btrfs_mksubvol(const struct path
*parent
,
934 const char *name
, int namelen
,
935 struct btrfs_root
*snap_src
,
936 u64
*async_transid
, bool readonly
,
937 struct btrfs_qgroup_inherit
*inherit
)
939 struct inode
*dir
= d_inode(parent
->dentry
);
940 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
941 struct dentry
*dentry
;
944 error
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
948 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
949 error
= PTR_ERR(dentry
);
953 error
= btrfs_may_create(dir
, dentry
);
958 * even if this name doesn't exist, we may get hash collisions.
959 * check for them now when we can safely fail
961 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
967 down_read(&fs_info
->subvol_sem
);
969 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
973 error
= create_snapshot(snap_src
, dir
, dentry
,
974 async_transid
, readonly
, inherit
);
976 error
= create_subvol(dir
, dentry
, name
, namelen
,
977 async_transid
, inherit
);
980 fsnotify_mkdir(dir
, dentry
);
982 up_read(&fs_info
->subvol_sem
);
991 * When we're defragging a range, we don't want to kick it off again
992 * if it is really just waiting for delalloc to send it down.
993 * If we find a nice big extent or delalloc range for the bytes in the
994 * file you want to defrag, we return 0 to let you know to skip this
997 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
999 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1000 struct extent_map
*em
= NULL
;
1001 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1004 read_lock(&em_tree
->lock
);
1005 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_SIZE
);
1006 read_unlock(&em_tree
->lock
);
1009 end
= extent_map_end(em
);
1010 free_extent_map(em
);
1011 if (end
- offset
> thresh
)
1014 /* if we already have a nice delalloc here, just stop */
1016 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
1017 thresh
, EXTENT_DELALLOC
, 1);
1024 * helper function to walk through a file and find extents
1025 * newer than a specific transid, and smaller than thresh.
1027 * This is used by the defragging code to find new and small
1030 static int find_new_extents(struct btrfs_root
*root
,
1031 struct inode
*inode
, u64 newer_than
,
1032 u64
*off
, u32 thresh
)
1034 struct btrfs_path
*path
;
1035 struct btrfs_key min_key
;
1036 struct extent_buffer
*leaf
;
1037 struct btrfs_file_extent_item
*extent
;
1040 u64 ino
= btrfs_ino(BTRFS_I(inode
));
1042 path
= btrfs_alloc_path();
1046 min_key
.objectid
= ino
;
1047 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
1048 min_key
.offset
= *off
;
1051 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
1055 if (min_key
.objectid
!= ino
)
1057 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
1060 leaf
= path
->nodes
[0];
1061 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
1062 struct btrfs_file_extent_item
);
1064 type
= btrfs_file_extent_type(leaf
, extent
);
1065 if (type
== BTRFS_FILE_EXTENT_REG
&&
1066 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
1067 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
1068 *off
= min_key
.offset
;
1069 btrfs_free_path(path
);
1074 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
1075 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
1079 if (min_key
.offset
== (u64
)-1)
1083 btrfs_release_path(path
);
1086 btrfs_free_path(path
);
1090 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
1092 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1093 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1094 struct extent_map
*em
;
1095 u64 len
= PAGE_SIZE
;
1098 * hopefully we have this extent in the tree already, try without
1099 * the full extent lock
1101 read_lock(&em_tree
->lock
);
1102 em
= lookup_extent_mapping(em_tree
, start
, len
);
1103 read_unlock(&em_tree
->lock
);
1106 struct extent_state
*cached
= NULL
;
1107 u64 end
= start
+ len
- 1;
1109 /* get the big lock and read metadata off disk */
1110 lock_extent_bits(io_tree
, start
, end
, &cached
);
1111 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, start
, len
, 0);
1112 unlock_extent_cached(io_tree
, start
, end
, &cached
);
1121 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1123 struct extent_map
*next
;
1126 /* this is the last extent */
1127 if (em
->start
+ em
->len
>= i_size_read(inode
))
1130 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1131 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1133 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1134 (em
->block_len
> SZ_128K
&& next
->block_len
> SZ_128K
))
1137 free_extent_map(next
);
1141 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1142 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1145 struct extent_map
*em
;
1147 bool next_mergeable
= true;
1148 bool prev_mergeable
= true;
1151 * make sure that once we start defragging an extent, we keep on
1154 if (start
< *defrag_end
)
1159 em
= defrag_lookup_extent(inode
, start
);
1163 /* this will cover holes, and inline extents */
1164 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1170 prev_mergeable
= false;
1172 next_mergeable
= defrag_check_next_extent(inode
, em
);
1174 * we hit a real extent, if it is big or the next extent is not a
1175 * real extent, don't bother defragging it
1177 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1178 (em
->len
>= thresh
|| (!next_mergeable
&& !prev_mergeable
)))
1182 * last_len ends up being a counter of how many bytes we've defragged.
1183 * every time we choose not to defrag an extent, we reset *last_len
1184 * so that the next tiny extent will force a defrag.
1186 * The end result of this is that tiny extents before a single big
1187 * extent will force at least part of that big extent to be defragged.
1190 *defrag_end
= extent_map_end(em
);
1193 *skip
= extent_map_end(em
);
1197 free_extent_map(em
);
1202 * it doesn't do much good to defrag one or two pages
1203 * at a time. This pulls in a nice chunk of pages
1204 * to COW and defrag.
1206 * It also makes sure the delalloc code has enough
1207 * dirty data to avoid making new small extents as part
1210 * It's a good idea to start RA on this range
1211 * before calling this.
1213 static int cluster_pages_for_defrag(struct inode
*inode
,
1214 struct page
**pages
,
1215 unsigned long start_index
,
1216 unsigned long num_pages
)
1218 unsigned long file_end
;
1219 u64 isize
= i_size_read(inode
);
1226 struct btrfs_ordered_extent
*ordered
;
1227 struct extent_state
*cached_state
= NULL
;
1228 struct extent_io_tree
*tree
;
1229 struct extent_changeset
*data_reserved
= NULL
;
1230 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1232 file_end
= (isize
- 1) >> PAGE_SHIFT
;
1233 if (!isize
|| start_index
> file_end
)
1236 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1238 ret
= btrfs_delalloc_reserve_space(inode
, &data_reserved
,
1239 start_index
<< PAGE_SHIFT
,
1240 page_cnt
<< PAGE_SHIFT
);
1244 tree
= &BTRFS_I(inode
)->io_tree
;
1246 /* step one, lock all the pages */
1247 for (i
= 0; i
< page_cnt
; i
++) {
1250 page
= find_or_create_page(inode
->i_mapping
,
1251 start_index
+ i
, mask
);
1255 page_start
= page_offset(page
);
1256 page_end
= page_start
+ PAGE_SIZE
- 1;
1258 lock_extent_bits(tree
, page_start
, page_end
,
1260 ordered
= btrfs_lookup_ordered_extent(inode
,
1262 unlock_extent_cached(tree
, page_start
, page_end
,
1268 btrfs_start_ordered_extent(inode
, ordered
, 1);
1269 btrfs_put_ordered_extent(ordered
);
1272 * we unlocked the page above, so we need check if
1273 * it was released or not.
1275 if (page
->mapping
!= inode
->i_mapping
) {
1282 if (!PageUptodate(page
)) {
1283 btrfs_readpage(NULL
, page
);
1285 if (!PageUptodate(page
)) {
1293 if (page
->mapping
!= inode
->i_mapping
) {
1305 if (!(inode
->i_sb
->s_flags
& SB_ACTIVE
))
1309 * so now we have a nice long stream of locked
1310 * and up to date pages, lets wait on them
1312 for (i
= 0; i
< i_done
; i
++)
1313 wait_on_page_writeback(pages
[i
]);
1315 page_start
= page_offset(pages
[0]);
1316 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_SIZE
;
1318 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1319 page_start
, page_end
- 1, &cached_state
);
1320 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1321 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1322 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1325 if (i_done
!= page_cnt
) {
1326 spin_lock(&BTRFS_I(inode
)->lock
);
1327 BTRFS_I(inode
)->outstanding_extents
++;
1328 spin_unlock(&BTRFS_I(inode
)->lock
);
1329 btrfs_delalloc_release_space(inode
, data_reserved
,
1330 start_index
<< PAGE_SHIFT
,
1331 (page_cnt
- i_done
) << PAGE_SHIFT
, true);
1335 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1338 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1339 page_start
, page_end
- 1, &cached_state
);
1341 for (i
= 0; i
< i_done
; i
++) {
1342 clear_page_dirty_for_io(pages
[i
]);
1343 ClearPageChecked(pages
[i
]);
1344 set_page_extent_mapped(pages
[i
]);
1345 set_page_dirty(pages
[i
]);
1346 unlock_page(pages
[i
]);
1349 btrfs_delalloc_release_extents(BTRFS_I(inode
), page_cnt
<< PAGE_SHIFT
,
1351 extent_changeset_free(data_reserved
);
1354 for (i
= 0; i
< i_done
; i
++) {
1355 unlock_page(pages
[i
]);
1358 btrfs_delalloc_release_space(inode
, data_reserved
,
1359 start_index
<< PAGE_SHIFT
,
1360 page_cnt
<< PAGE_SHIFT
, true);
1361 btrfs_delalloc_release_extents(BTRFS_I(inode
), page_cnt
<< PAGE_SHIFT
,
1363 extent_changeset_free(data_reserved
);
1368 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1369 struct btrfs_ioctl_defrag_range_args
*range
,
1370 u64 newer_than
, unsigned long max_to_defrag
)
1372 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1373 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1374 struct file_ra_state
*ra
= NULL
;
1375 unsigned long last_index
;
1376 u64 isize
= i_size_read(inode
);
1380 u64 newer_off
= range
->start
;
1382 unsigned long ra_index
= 0;
1384 int defrag_count
= 0;
1385 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1386 u32 extent_thresh
= range
->extent_thresh
;
1387 unsigned long max_cluster
= SZ_256K
>> PAGE_SHIFT
;
1388 unsigned long cluster
= max_cluster
;
1389 u64 new_align
= ~((u64
)SZ_128K
- 1);
1390 struct page
**pages
= NULL
;
1391 bool do_compress
= range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
;
1396 if (range
->start
>= isize
)
1400 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1402 if (range
->compress_type
)
1403 compress_type
= range
->compress_type
;
1406 if (extent_thresh
== 0)
1407 extent_thresh
= SZ_256K
;
1410 * If we were not given a file, allocate a readahead context. As
1411 * readahead is just an optimization, defrag will work without it so
1412 * we don't error out.
1415 ra
= kzalloc(sizeof(*ra
), GFP_KERNEL
);
1417 file_ra_state_init(ra
, inode
->i_mapping
);
1422 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*), GFP_KERNEL
);
1428 /* find the last page to defrag */
1429 if (range
->start
+ range
->len
> range
->start
) {
1430 last_index
= min_t(u64
, isize
- 1,
1431 range
->start
+ range
->len
- 1) >> PAGE_SHIFT
;
1433 last_index
= (isize
- 1) >> PAGE_SHIFT
;
1437 ret
= find_new_extents(root
, inode
, newer_than
,
1438 &newer_off
, SZ_64K
);
1440 range
->start
= newer_off
;
1442 * we always align our defrag to help keep
1443 * the extents in the file evenly spaced
1445 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1449 i
= range
->start
>> PAGE_SHIFT
;
1452 max_to_defrag
= last_index
- i
+ 1;
1455 * make writeback starts from i, so the defrag range can be
1456 * written sequentially.
1458 if (i
< inode
->i_mapping
->writeback_index
)
1459 inode
->i_mapping
->writeback_index
= i
;
1461 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1462 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_SIZE
))) {
1464 * make sure we stop running if someone unmounts
1467 if (!(inode
->i_sb
->s_flags
& SB_ACTIVE
))
1470 if (btrfs_defrag_cancelled(fs_info
)) {
1471 btrfs_debug(fs_info
, "defrag_file cancelled");
1476 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_SHIFT
,
1477 extent_thresh
, &last_len
, &skip
,
1478 &defrag_end
, do_compress
)){
1481 * the should_defrag function tells us how much to skip
1482 * bump our counter by the suggested amount
1484 next
= DIV_ROUND_UP(skip
, PAGE_SIZE
);
1485 i
= max(i
+ 1, next
);
1490 cluster
= (PAGE_ALIGN(defrag_end
) >>
1492 cluster
= min(cluster
, max_cluster
);
1494 cluster
= max_cluster
;
1497 if (i
+ cluster
> ra_index
) {
1498 ra_index
= max(i
, ra_index
);
1500 page_cache_sync_readahead(inode
->i_mapping
, ra
,
1501 file
, ra_index
, cluster
);
1502 ra_index
+= cluster
;
1507 BTRFS_I(inode
)->defrag_compress
= compress_type
;
1508 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1510 inode_unlock(inode
);
1514 defrag_count
+= ret
;
1515 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1516 inode_unlock(inode
);
1519 if (newer_off
== (u64
)-1)
1525 newer_off
= max(newer_off
+ 1,
1526 (u64
)i
<< PAGE_SHIFT
);
1528 ret
= find_new_extents(root
, inode
, newer_than
,
1529 &newer_off
, SZ_64K
);
1531 range
->start
= newer_off
;
1532 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1539 last_len
+= ret
<< PAGE_SHIFT
;
1547 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1548 filemap_flush(inode
->i_mapping
);
1549 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1550 &BTRFS_I(inode
)->runtime_flags
))
1551 filemap_flush(inode
->i_mapping
);
1554 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1555 btrfs_set_fs_incompat(fs_info
, COMPRESS_LZO
);
1556 } else if (range
->compress_type
== BTRFS_COMPRESS_ZSTD
) {
1557 btrfs_set_fs_incompat(fs_info
, COMPRESS_ZSTD
);
1565 BTRFS_I(inode
)->defrag_compress
= BTRFS_COMPRESS_NONE
;
1566 inode_unlock(inode
);
1574 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1577 struct inode
*inode
= file_inode(file
);
1578 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1582 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1583 struct btrfs_ioctl_vol_args
*vol_args
;
1584 struct btrfs_trans_handle
*trans
;
1585 struct btrfs_device
*device
= NULL
;
1588 char *devstr
= NULL
;
1592 if (!capable(CAP_SYS_ADMIN
))
1595 ret
= mnt_want_write_file(file
);
1599 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
1600 mnt_drop_write_file(file
);
1601 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1604 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1605 if (IS_ERR(vol_args
)) {
1606 ret
= PTR_ERR(vol_args
);
1610 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1612 sizestr
= vol_args
->name
;
1613 devstr
= strchr(sizestr
, ':');
1615 sizestr
= devstr
+ 1;
1617 devstr
= vol_args
->name
;
1618 ret
= kstrtoull(devstr
, 10, &devid
);
1625 btrfs_info(fs_info
, "resizing devid %llu", devid
);
1628 device
= btrfs_find_device(fs_info
, devid
, NULL
, NULL
);
1630 btrfs_info(fs_info
, "resizer unable to find device %llu",
1636 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE
, &device
->dev_state
)) {
1638 "resizer unable to apply on readonly device %llu",
1644 if (!strcmp(sizestr
, "max"))
1645 new_size
= device
->bdev
->bd_inode
->i_size
;
1647 if (sizestr
[0] == '-') {
1650 } else if (sizestr
[0] == '+') {
1654 new_size
= memparse(sizestr
, &retptr
);
1655 if (*retptr
!= '\0' || new_size
== 0) {
1661 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT
, &device
->dev_state
)) {
1666 old_size
= btrfs_device_get_total_bytes(device
);
1669 if (new_size
> old_size
) {
1673 new_size
= old_size
- new_size
;
1674 } else if (mod
> 0) {
1675 if (new_size
> ULLONG_MAX
- old_size
) {
1679 new_size
= old_size
+ new_size
;
1682 if (new_size
< SZ_256M
) {
1686 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1691 new_size
= round_down(new_size
, fs_info
->sectorsize
);
1693 btrfs_info_in_rcu(fs_info
, "new size for %s is %llu",
1694 rcu_str_deref(device
->name
), new_size
);
1696 if (new_size
> old_size
) {
1697 trans
= btrfs_start_transaction(root
, 0);
1698 if (IS_ERR(trans
)) {
1699 ret
= PTR_ERR(trans
);
1702 ret
= btrfs_grow_device(trans
, device
, new_size
);
1703 btrfs_commit_transaction(trans
);
1704 } else if (new_size
< old_size
) {
1705 ret
= btrfs_shrink_device(device
, new_size
);
1706 } /* equal, nothing need to do */
1711 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
1712 mnt_drop_write_file(file
);
1716 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1717 const char *name
, unsigned long fd
, int subvol
,
1718 u64
*transid
, bool readonly
,
1719 struct btrfs_qgroup_inherit
*inherit
)
1724 if (!S_ISDIR(file_inode(file
)->i_mode
))
1727 ret
= mnt_want_write_file(file
);
1731 namelen
= strlen(name
);
1732 if (strchr(name
, '/')) {
1734 goto out_drop_write
;
1737 if (name
[0] == '.' &&
1738 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1740 goto out_drop_write
;
1744 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1745 NULL
, transid
, readonly
, inherit
);
1747 struct fd src
= fdget(fd
);
1748 struct inode
*src_inode
;
1751 goto out_drop_write
;
1754 src_inode
= file_inode(src
.file
);
1755 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1756 btrfs_info(BTRFS_I(file_inode(file
))->root
->fs_info
,
1757 "Snapshot src from another FS");
1759 } else if (!inode_owner_or_capable(src_inode
)) {
1761 * Subvolume creation is not restricted, but snapshots
1762 * are limited to own subvolumes only
1766 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1767 BTRFS_I(src_inode
)->root
,
1768 transid
, readonly
, inherit
);
1773 mnt_drop_write_file(file
);
1778 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1779 void __user
*arg
, int subvol
)
1781 struct btrfs_ioctl_vol_args
*vol_args
;
1784 if (!S_ISDIR(file_inode(file
)->i_mode
))
1787 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1788 if (IS_ERR(vol_args
))
1789 return PTR_ERR(vol_args
);
1790 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1792 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1793 vol_args
->fd
, subvol
,
1800 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1801 void __user
*arg
, int subvol
)
1803 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1807 bool readonly
= false;
1808 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1810 if (!S_ISDIR(file_inode(file
)->i_mode
))
1813 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1814 if (IS_ERR(vol_args
))
1815 return PTR_ERR(vol_args
);
1816 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1818 if (vol_args
->flags
&
1819 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1820 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1825 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1827 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1829 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1830 if (vol_args
->size
> PAGE_SIZE
) {
1834 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1835 if (IS_ERR(inherit
)) {
1836 ret
= PTR_ERR(inherit
);
1841 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1842 vol_args
->fd
, subvol
, ptr
,
1847 if (ptr
&& copy_to_user(arg
+
1848 offsetof(struct btrfs_ioctl_vol_args_v2
,
1860 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1863 struct inode
*inode
= file_inode(file
);
1864 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1865 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1869 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
)
1872 down_read(&fs_info
->subvol_sem
);
1873 if (btrfs_root_readonly(root
))
1874 flags
|= BTRFS_SUBVOL_RDONLY
;
1875 up_read(&fs_info
->subvol_sem
);
1877 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1883 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1886 struct inode
*inode
= file_inode(file
);
1887 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1888 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1889 struct btrfs_trans_handle
*trans
;
1894 if (!inode_owner_or_capable(inode
))
1897 ret
= mnt_want_write_file(file
);
1901 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
1903 goto out_drop_write
;
1906 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1908 goto out_drop_write
;
1911 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1913 goto out_drop_write
;
1916 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1918 goto out_drop_write
;
1921 down_write(&fs_info
->subvol_sem
);
1924 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1927 root_flags
= btrfs_root_flags(&root
->root_item
);
1928 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1929 btrfs_set_root_flags(&root
->root_item
,
1930 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1933 * Block RO -> RW transition if this subvolume is involved in
1936 spin_lock(&root
->root_item_lock
);
1937 if (root
->send_in_progress
== 0) {
1938 btrfs_set_root_flags(&root
->root_item
,
1939 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1940 spin_unlock(&root
->root_item_lock
);
1942 spin_unlock(&root
->root_item_lock
);
1944 "Attempt to set subvolume %llu read-write during send",
1945 root
->root_key
.objectid
);
1951 trans
= btrfs_start_transaction(root
, 1);
1952 if (IS_ERR(trans
)) {
1953 ret
= PTR_ERR(trans
);
1957 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
1958 &root
->root_key
, &root
->root_item
);
1960 btrfs_end_transaction(trans
);
1964 ret
= btrfs_commit_transaction(trans
);
1968 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1970 up_write(&fs_info
->subvol_sem
);
1972 mnt_drop_write_file(file
);
1977 static noinline
int key_in_sk(struct btrfs_key
*key
,
1978 struct btrfs_ioctl_search_key
*sk
)
1980 struct btrfs_key test
;
1983 test
.objectid
= sk
->min_objectid
;
1984 test
.type
= sk
->min_type
;
1985 test
.offset
= sk
->min_offset
;
1987 ret
= btrfs_comp_cpu_keys(key
, &test
);
1991 test
.objectid
= sk
->max_objectid
;
1992 test
.type
= sk
->max_type
;
1993 test
.offset
= sk
->max_offset
;
1995 ret
= btrfs_comp_cpu_keys(key
, &test
);
2001 static noinline
int copy_to_sk(struct btrfs_path
*path
,
2002 struct btrfs_key
*key
,
2003 struct btrfs_ioctl_search_key
*sk
,
2006 unsigned long *sk_offset
,
2010 struct extent_buffer
*leaf
;
2011 struct btrfs_ioctl_search_header sh
;
2012 struct btrfs_key test
;
2013 unsigned long item_off
;
2014 unsigned long item_len
;
2020 leaf
= path
->nodes
[0];
2021 slot
= path
->slots
[0];
2022 nritems
= btrfs_header_nritems(leaf
);
2024 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
2028 found_transid
= btrfs_header_generation(leaf
);
2030 for (i
= slot
; i
< nritems
; i
++) {
2031 item_off
= btrfs_item_ptr_offset(leaf
, i
);
2032 item_len
= btrfs_item_size_nr(leaf
, i
);
2034 btrfs_item_key_to_cpu(leaf
, key
, i
);
2035 if (!key_in_sk(key
, sk
))
2038 if (sizeof(sh
) + item_len
> *buf_size
) {
2045 * return one empty item back for v1, which does not
2049 *buf_size
= sizeof(sh
) + item_len
;
2054 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
2059 sh
.objectid
= key
->objectid
;
2060 sh
.offset
= key
->offset
;
2061 sh
.type
= key
->type
;
2063 sh
.transid
= found_transid
;
2065 /* copy search result header */
2066 if (copy_to_user(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
2071 *sk_offset
+= sizeof(sh
);
2074 char __user
*up
= ubuf
+ *sk_offset
;
2076 if (read_extent_buffer_to_user(leaf
, up
,
2077 item_off
, item_len
)) {
2082 *sk_offset
+= item_len
;
2086 if (ret
) /* -EOVERFLOW from above */
2089 if (*num_found
>= sk
->nr_items
) {
2096 test
.objectid
= sk
->max_objectid
;
2097 test
.type
= sk
->max_type
;
2098 test
.offset
= sk
->max_offset
;
2099 if (btrfs_comp_cpu_keys(key
, &test
) >= 0)
2101 else if (key
->offset
< (u64
)-1)
2103 else if (key
->type
< (u8
)-1) {
2106 } else if (key
->objectid
< (u64
)-1) {
2114 * 0: all items from this leaf copied, continue with next
2115 * 1: * more items can be copied, but unused buffer is too small
2116 * * all items were found
2117 * Either way, it will stops the loop which iterates to the next
2119 * -EOVERFLOW: item was to large for buffer
2120 * -EFAULT: could not copy extent buffer back to userspace
2125 static noinline
int search_ioctl(struct inode
*inode
,
2126 struct btrfs_ioctl_search_key
*sk
,
2130 struct btrfs_fs_info
*info
= btrfs_sb(inode
->i_sb
);
2131 struct btrfs_root
*root
;
2132 struct btrfs_key key
;
2133 struct btrfs_path
*path
;
2136 unsigned long sk_offset
= 0;
2138 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2139 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2143 path
= btrfs_alloc_path();
2147 if (sk
->tree_id
== 0) {
2148 /* search the root of the inode that was passed */
2149 root
= BTRFS_I(inode
)->root
;
2151 key
.objectid
= sk
->tree_id
;
2152 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2153 key
.offset
= (u64
)-1;
2154 root
= btrfs_read_fs_root_no_name(info
, &key
);
2156 btrfs_free_path(path
);
2157 return PTR_ERR(root
);
2161 key
.objectid
= sk
->min_objectid
;
2162 key
.type
= sk
->min_type
;
2163 key
.offset
= sk
->min_offset
;
2166 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2172 ret
= copy_to_sk(path
, &key
, sk
, buf_size
, ubuf
,
2173 &sk_offset
, &num_found
);
2174 btrfs_release_path(path
);
2182 sk
->nr_items
= num_found
;
2183 btrfs_free_path(path
);
2187 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2190 struct btrfs_ioctl_search_args __user
*uargs
;
2191 struct btrfs_ioctl_search_key sk
;
2192 struct inode
*inode
;
2196 if (!capable(CAP_SYS_ADMIN
))
2199 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2201 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2204 buf_size
= sizeof(uargs
->buf
);
2206 inode
= file_inode(file
);
2207 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2210 * In the origin implementation an overflow is handled by returning a
2211 * search header with a len of zero, so reset ret.
2213 if (ret
== -EOVERFLOW
)
2216 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2221 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2224 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2225 struct btrfs_ioctl_search_args_v2 args
;
2226 struct inode
*inode
;
2229 const size_t buf_limit
= SZ_16M
;
2231 if (!capable(CAP_SYS_ADMIN
))
2234 /* copy search header and buffer size */
2235 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2236 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2239 buf_size
= args
.buf_size
;
2241 /* limit result size to 16MB */
2242 if (buf_size
> buf_limit
)
2243 buf_size
= buf_limit
;
2245 inode
= file_inode(file
);
2246 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2247 (char __user
*)(&uarg
->buf
[0]));
2248 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2250 else if (ret
== -EOVERFLOW
&&
2251 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2258 * Search INODE_REFs to identify path name of 'dirid' directory
2259 * in a 'tree_id' tree. and sets path name to 'name'.
2261 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2262 u64 tree_id
, u64 dirid
, char *name
)
2264 struct btrfs_root
*root
;
2265 struct btrfs_key key
;
2271 struct btrfs_inode_ref
*iref
;
2272 struct extent_buffer
*l
;
2273 struct btrfs_path
*path
;
2275 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2280 path
= btrfs_alloc_path();
2284 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
- 1];
2286 key
.objectid
= tree_id
;
2287 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2288 key
.offset
= (u64
)-1;
2289 root
= btrfs_read_fs_root_no_name(info
, &key
);
2291 ret
= PTR_ERR(root
);
2295 key
.objectid
= dirid
;
2296 key
.type
= BTRFS_INODE_REF_KEY
;
2297 key
.offset
= (u64
)-1;
2300 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2304 ret
= btrfs_previous_item(root
, path
, dirid
,
2305 BTRFS_INODE_REF_KEY
);
2315 slot
= path
->slots
[0];
2316 btrfs_item_key_to_cpu(l
, &key
, slot
);
2318 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2319 len
= btrfs_inode_ref_name_len(l
, iref
);
2321 total_len
+= len
+ 1;
2323 ret
= -ENAMETOOLONG
;
2328 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2330 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2333 btrfs_release_path(path
);
2334 key
.objectid
= key
.offset
;
2335 key
.offset
= (u64
)-1;
2336 dirid
= key
.objectid
;
2338 memmove(name
, ptr
, total_len
);
2339 name
[total_len
] = '\0';
2342 btrfs_free_path(path
);
2346 static int btrfs_search_path_in_tree_user(struct inode
*inode
,
2347 struct btrfs_ioctl_ino_lookup_user_args
*args
)
2349 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2350 struct super_block
*sb
= inode
->i_sb
;
2351 struct btrfs_key upper_limit
= BTRFS_I(inode
)->location
;
2352 u64 treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2353 u64 dirid
= args
->dirid
;
2354 unsigned long item_off
;
2355 unsigned long item_len
;
2356 struct btrfs_inode_ref
*iref
;
2357 struct btrfs_root_ref
*rref
;
2358 struct btrfs_root
*root
;
2359 struct btrfs_path
*path
;
2360 struct btrfs_key key
, key2
;
2361 struct extent_buffer
*leaf
;
2362 struct inode
*temp_inode
;
2369 path
= btrfs_alloc_path();
2374 * If the bottom subvolume does not exist directly under upper_limit,
2375 * construct the path in from the bottom up.
2377 if (dirid
!= upper_limit
.objectid
) {
2378 ptr
= &args
->path
[BTRFS_INO_LOOKUP_USER_PATH_MAX
- 1];
2380 key
.objectid
= treeid
;
2381 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2382 key
.offset
= (u64
)-1;
2383 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2385 ret
= PTR_ERR(root
);
2389 key
.objectid
= dirid
;
2390 key
.type
= BTRFS_INODE_REF_KEY
;
2391 key
.offset
= (u64
)-1;
2393 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2396 } else if (ret
> 0) {
2397 ret
= btrfs_previous_item(root
, path
, dirid
,
2398 BTRFS_INODE_REF_KEY
);
2401 } else if (ret
> 0) {
2407 leaf
= path
->nodes
[0];
2408 slot
= path
->slots
[0];
2409 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2411 iref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_inode_ref
);
2412 len
= btrfs_inode_ref_name_len(leaf
, iref
);
2414 total_len
+= len
+ 1;
2415 if (ptr
< args
->path
) {
2416 ret
= -ENAMETOOLONG
;
2421 read_extent_buffer(leaf
, ptr
,
2422 (unsigned long)(iref
+ 1), len
);
2424 /* Check the read+exec permission of this directory */
2425 ret
= btrfs_previous_item(root
, path
, dirid
,
2426 BTRFS_INODE_ITEM_KEY
);
2429 } else if (ret
> 0) {
2434 leaf
= path
->nodes
[0];
2435 slot
= path
->slots
[0];
2436 btrfs_item_key_to_cpu(leaf
, &key2
, slot
);
2437 if (key2
.objectid
!= dirid
) {
2442 temp_inode
= btrfs_iget(sb
, &key2
, root
, NULL
);
2443 if (IS_ERR(temp_inode
)) {
2444 ret
= PTR_ERR(temp_inode
);
2447 ret
= inode_permission(temp_inode
, MAY_READ
| MAY_EXEC
);
2454 if (key
.offset
== upper_limit
.objectid
)
2456 if (key
.objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2461 btrfs_release_path(path
);
2462 key
.objectid
= key
.offset
;
2463 key
.offset
= (u64
)-1;
2464 dirid
= key
.objectid
;
2467 memmove(args
->path
, ptr
, total_len
);
2468 args
->path
[total_len
] = '\0';
2469 btrfs_release_path(path
);
2472 /* Get the bottom subvolume's name from ROOT_REF */
2473 root
= fs_info
->tree_root
;
2474 key
.objectid
= treeid
;
2475 key
.type
= BTRFS_ROOT_REF_KEY
;
2476 key
.offset
= args
->treeid
;
2477 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2480 } else if (ret
> 0) {
2485 leaf
= path
->nodes
[0];
2486 slot
= path
->slots
[0];
2487 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2489 item_off
= btrfs_item_ptr_offset(leaf
, slot
);
2490 item_len
= btrfs_item_size_nr(leaf
, slot
);
2491 /* Check if dirid in ROOT_REF corresponds to passed dirid */
2492 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2493 if (args
->dirid
!= btrfs_root_ref_dirid(leaf
, rref
)) {
2498 /* Copy subvolume's name */
2499 item_off
+= sizeof(struct btrfs_root_ref
);
2500 item_len
-= sizeof(struct btrfs_root_ref
);
2501 read_extent_buffer(leaf
, args
->name
, item_off
, item_len
);
2502 args
->name
[item_len
] = 0;
2505 btrfs_free_path(path
);
2509 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2512 struct btrfs_ioctl_ino_lookup_args
*args
;
2513 struct inode
*inode
;
2516 args
= memdup_user(argp
, sizeof(*args
));
2518 return PTR_ERR(args
);
2520 inode
= file_inode(file
);
2523 * Unprivileged query to obtain the containing subvolume root id. The
2524 * path is reset so it's consistent with btrfs_search_path_in_tree.
2526 if (args
->treeid
== 0)
2527 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2529 if (args
->objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2534 if (!capable(CAP_SYS_ADMIN
)) {
2539 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2540 args
->treeid
, args
->objectid
,
2544 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2552 * Version of ino_lookup ioctl (unprivileged)
2554 * The main differences from ino_lookup ioctl are:
2556 * 1. Read + Exec permission will be checked using inode_permission() during
2557 * path construction. -EACCES will be returned in case of failure.
2558 * 2. Path construction will be stopped at the inode number which corresponds
2559 * to the fd with which this ioctl is called. If constructed path does not
2560 * exist under fd's inode, -EACCES will be returned.
2561 * 3. The name of bottom subvolume is also searched and filled.
2563 static int btrfs_ioctl_ino_lookup_user(struct file
*file
, void __user
*argp
)
2565 struct btrfs_ioctl_ino_lookup_user_args
*args
;
2566 struct inode
*inode
;
2569 args
= memdup_user(argp
, sizeof(*args
));
2571 return PTR_ERR(args
);
2573 inode
= file_inode(file
);
2575 if (args
->dirid
== BTRFS_FIRST_FREE_OBJECTID
&&
2576 BTRFS_I(inode
)->location
.objectid
!= BTRFS_FIRST_FREE_OBJECTID
) {
2578 * The subvolume does not exist under fd with which this is
2585 ret
= btrfs_search_path_in_tree_user(inode
, args
);
2587 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2594 /* Get the subvolume information in BTRFS_ROOT_ITEM and BTRFS_ROOT_BACKREF */
2595 static int btrfs_ioctl_get_subvol_info(struct file
*file
, void __user
*argp
)
2597 struct btrfs_ioctl_get_subvol_info_args
*subvol_info
;
2598 struct btrfs_fs_info
*fs_info
;
2599 struct btrfs_root
*root
;
2600 struct btrfs_path
*path
;
2601 struct btrfs_key key
;
2602 struct btrfs_root_item
*root_item
;
2603 struct btrfs_root_ref
*rref
;
2604 struct extent_buffer
*leaf
;
2605 unsigned long item_off
;
2606 unsigned long item_len
;
2607 struct inode
*inode
;
2611 path
= btrfs_alloc_path();
2615 subvol_info
= kzalloc(sizeof(*subvol_info
), GFP_KERNEL
);
2617 btrfs_free_path(path
);
2621 inode
= file_inode(file
);
2622 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2624 /* Get root_item of inode's subvolume */
2625 key
.objectid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2626 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2627 key
.offset
= (u64
)-1;
2628 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2630 ret
= PTR_ERR(root
);
2633 root_item
= &root
->root_item
;
2635 subvol_info
->treeid
= key
.objectid
;
2637 subvol_info
->generation
= btrfs_root_generation(root_item
);
2638 subvol_info
->flags
= btrfs_root_flags(root_item
);
2640 memcpy(subvol_info
->uuid
, root_item
->uuid
, BTRFS_UUID_SIZE
);
2641 memcpy(subvol_info
->parent_uuid
, root_item
->parent_uuid
,
2643 memcpy(subvol_info
->received_uuid
, root_item
->received_uuid
,
2646 subvol_info
->ctransid
= btrfs_root_ctransid(root_item
);
2647 subvol_info
->ctime
.sec
= btrfs_stack_timespec_sec(&root_item
->ctime
);
2648 subvol_info
->ctime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->ctime
);
2650 subvol_info
->otransid
= btrfs_root_otransid(root_item
);
2651 subvol_info
->otime
.sec
= btrfs_stack_timespec_sec(&root_item
->otime
);
2652 subvol_info
->otime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->otime
);
2654 subvol_info
->stransid
= btrfs_root_stransid(root_item
);
2655 subvol_info
->stime
.sec
= btrfs_stack_timespec_sec(&root_item
->stime
);
2656 subvol_info
->stime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->stime
);
2658 subvol_info
->rtransid
= btrfs_root_rtransid(root_item
);
2659 subvol_info
->rtime
.sec
= btrfs_stack_timespec_sec(&root_item
->rtime
);
2660 subvol_info
->rtime
.nsec
= btrfs_stack_timespec_nsec(&root_item
->rtime
);
2662 if (key
.objectid
!= BTRFS_FS_TREE_OBJECTID
) {
2663 /* Search root tree for ROOT_BACKREF of this subvolume */
2664 root
= fs_info
->tree_root
;
2666 key
.type
= BTRFS_ROOT_BACKREF_KEY
;
2668 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2671 } else if (path
->slots
[0] >=
2672 btrfs_header_nritems(path
->nodes
[0])) {
2673 ret
= btrfs_next_leaf(root
, path
);
2676 } else if (ret
> 0) {
2682 leaf
= path
->nodes
[0];
2683 slot
= path
->slots
[0];
2684 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2685 if (key
.objectid
== subvol_info
->treeid
&&
2686 key
.type
== BTRFS_ROOT_BACKREF_KEY
) {
2687 subvol_info
->parent_id
= key
.offset
;
2689 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2690 subvol_info
->dirid
= btrfs_root_ref_dirid(leaf
, rref
);
2692 item_off
= btrfs_item_ptr_offset(leaf
, slot
)
2693 + sizeof(struct btrfs_root_ref
);
2694 item_len
= btrfs_item_size_nr(leaf
, slot
)
2695 - sizeof(struct btrfs_root_ref
);
2696 read_extent_buffer(leaf
, subvol_info
->name
,
2697 item_off
, item_len
);
2704 if (copy_to_user(argp
, subvol_info
, sizeof(*subvol_info
)))
2708 btrfs_free_path(path
);
2709 kzfree(subvol_info
);
2714 * Return ROOT_REF information of the subvolume containing this inode
2715 * except the subvolume name.
2717 static int btrfs_ioctl_get_subvol_rootref(struct file
*file
, void __user
*argp
)
2719 struct btrfs_ioctl_get_subvol_rootref_args
*rootrefs
;
2720 struct btrfs_root_ref
*rref
;
2721 struct btrfs_root
*root
;
2722 struct btrfs_path
*path
;
2723 struct btrfs_key key
;
2724 struct extent_buffer
*leaf
;
2725 struct inode
*inode
;
2731 path
= btrfs_alloc_path();
2735 rootrefs
= memdup_user(argp
, sizeof(*rootrefs
));
2736 if (IS_ERR(rootrefs
)) {
2737 btrfs_free_path(path
);
2738 return PTR_ERR(rootrefs
);
2741 inode
= file_inode(file
);
2742 root
= BTRFS_I(inode
)->root
->fs_info
->tree_root
;
2743 objectid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2745 key
.objectid
= objectid
;
2746 key
.type
= BTRFS_ROOT_REF_KEY
;
2747 key
.offset
= rootrefs
->min_treeid
;
2750 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2753 } else if (path
->slots
[0] >=
2754 btrfs_header_nritems(path
->nodes
[0])) {
2755 ret
= btrfs_next_leaf(root
, path
);
2758 } else if (ret
> 0) {
2764 leaf
= path
->nodes
[0];
2765 slot
= path
->slots
[0];
2767 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2768 if (key
.objectid
!= objectid
|| key
.type
!= BTRFS_ROOT_REF_KEY
) {
2773 if (found
== BTRFS_MAX_ROOTREF_BUFFER_NUM
) {
2778 rref
= btrfs_item_ptr(leaf
, slot
, struct btrfs_root_ref
);
2779 rootrefs
->rootref
[found
].treeid
= key
.offset
;
2780 rootrefs
->rootref
[found
].dirid
=
2781 btrfs_root_ref_dirid(leaf
, rref
);
2784 ret
= btrfs_next_item(root
, path
);
2787 } else if (ret
> 0) {
2794 if (!ret
|| ret
== -EOVERFLOW
) {
2795 rootrefs
->num_items
= found
;
2796 /* update min_treeid for next search */
2798 rootrefs
->min_treeid
=
2799 rootrefs
->rootref
[found
- 1].treeid
+ 1;
2800 if (copy_to_user(argp
, rootrefs
, sizeof(*rootrefs
)))
2805 btrfs_free_path(path
);
2810 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2813 struct dentry
*parent
= file
->f_path
.dentry
;
2814 struct btrfs_fs_info
*fs_info
= btrfs_sb(parent
->d_sb
);
2815 struct dentry
*dentry
;
2816 struct inode
*dir
= d_inode(parent
);
2817 struct inode
*inode
;
2818 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2819 struct btrfs_root
*dest
= NULL
;
2820 struct btrfs_ioctl_vol_args
*vol_args
;
2824 if (!S_ISDIR(dir
->i_mode
))
2827 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2828 if (IS_ERR(vol_args
))
2829 return PTR_ERR(vol_args
);
2831 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2832 namelen
= strlen(vol_args
->name
);
2833 if (strchr(vol_args
->name
, '/') ||
2834 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2839 err
= mnt_want_write_file(file
);
2844 err
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
2846 goto out_drop_write
;
2847 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2848 if (IS_ERR(dentry
)) {
2849 err
= PTR_ERR(dentry
);
2850 goto out_unlock_dir
;
2853 if (d_really_is_negative(dentry
)) {
2858 inode
= d_inode(dentry
);
2859 dest
= BTRFS_I(inode
)->root
;
2860 if (!capable(CAP_SYS_ADMIN
)) {
2862 * Regular user. Only allow this with a special mount
2863 * option, when the user has write+exec access to the
2864 * subvol root, and when rmdir(2) would have been
2867 * Note that this is _not_ check that the subvol is
2868 * empty or doesn't contain data that we wouldn't
2869 * otherwise be able to delete.
2871 * Users who want to delete empty subvols should try
2875 if (!btrfs_test_opt(fs_info
, USER_SUBVOL_RM_ALLOWED
))
2879 * Do not allow deletion if the parent dir is the same
2880 * as the dir to be deleted. That means the ioctl
2881 * must be called on the dentry referencing the root
2882 * of the subvol, not a random directory contained
2889 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2894 /* check if subvolume may be deleted by a user */
2895 err
= btrfs_may_delete(dir
, dentry
, 1);
2899 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
2905 err
= btrfs_delete_subvolume(dir
, dentry
);
2906 inode_unlock(inode
);
2915 mnt_drop_write_file(file
);
2921 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2923 struct inode
*inode
= file_inode(file
);
2924 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2925 struct btrfs_ioctl_defrag_range_args
*range
;
2928 ret
= mnt_want_write_file(file
);
2932 if (btrfs_root_readonly(root
)) {
2937 switch (inode
->i_mode
& S_IFMT
) {
2939 if (!capable(CAP_SYS_ADMIN
)) {
2943 ret
= btrfs_defrag_root(root
);
2947 * Note that this does not check the file descriptor for write
2948 * access. This prevents defragmenting executables that are
2949 * running and allows defrag on files open in read-only mode.
2951 if (!capable(CAP_SYS_ADMIN
) &&
2952 inode_permission(inode
, MAY_WRITE
)) {
2957 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2964 if (copy_from_user(range
, argp
,
2970 /* compression requires us to start the IO */
2971 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2972 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2973 range
->extent_thresh
= (u32
)-1;
2976 /* the rest are all set to zero by kzalloc */
2977 range
->len
= (u64
)-1;
2979 ret
= btrfs_defrag_file(file_inode(file
), file
,
2980 range
, BTRFS_OLDEST_GENERATION
, 0);
2989 mnt_drop_write_file(file
);
2993 static long btrfs_ioctl_add_dev(struct btrfs_fs_info
*fs_info
, void __user
*arg
)
2995 struct btrfs_ioctl_vol_args
*vol_args
;
2998 if (!capable(CAP_SYS_ADMIN
))
3001 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
))
3002 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3004 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3005 if (IS_ERR(vol_args
)) {
3006 ret
= PTR_ERR(vol_args
);
3010 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
3011 ret
= btrfs_init_new_device(fs_info
, vol_args
->name
);
3014 btrfs_info(fs_info
, "disk added %s", vol_args
->name
);
3018 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3022 static long btrfs_ioctl_rm_dev_v2(struct file
*file
, void __user
*arg
)
3024 struct inode
*inode
= file_inode(file
);
3025 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3026 struct btrfs_ioctl_vol_args_v2
*vol_args
;
3029 if (!capable(CAP_SYS_ADMIN
))
3032 ret
= mnt_want_write_file(file
);
3036 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3037 if (IS_ERR(vol_args
)) {
3038 ret
= PTR_ERR(vol_args
);
3042 /* Check for compatibility reject unknown flags */
3043 if (vol_args
->flags
& ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED
) {
3048 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
3049 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3053 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
) {
3054 ret
= btrfs_rm_device(fs_info
, NULL
, vol_args
->devid
);
3056 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
3057 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0);
3059 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3062 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
)
3063 btrfs_info(fs_info
, "device deleted: id %llu",
3066 btrfs_info(fs_info
, "device deleted: %s",
3072 mnt_drop_write_file(file
);
3076 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
3078 struct inode
*inode
= file_inode(file
);
3079 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3080 struct btrfs_ioctl_vol_args
*vol_args
;
3083 if (!capable(CAP_SYS_ADMIN
))
3086 ret
= mnt_want_write_file(file
);
3090 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
3091 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3092 goto out_drop_write
;
3095 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
3096 if (IS_ERR(vol_args
)) {
3097 ret
= PTR_ERR(vol_args
);
3101 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
3102 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0);
3105 btrfs_info(fs_info
, "disk deleted %s", vol_args
->name
);
3108 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
3110 mnt_drop_write_file(file
);
3115 static long btrfs_ioctl_fs_info(struct btrfs_fs_info
*fs_info
,
3118 struct btrfs_ioctl_fs_info_args
*fi_args
;
3119 struct btrfs_device
*device
;
3120 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
3123 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
3128 fi_args
->num_devices
= fs_devices
->num_devices
;
3130 list_for_each_entry_rcu(device
, &fs_devices
->devices
, dev_list
) {
3131 if (device
->devid
> fi_args
->max_id
)
3132 fi_args
->max_id
= device
->devid
;
3136 memcpy(&fi_args
->fsid
, fs_info
->fsid
, sizeof(fi_args
->fsid
));
3137 fi_args
->nodesize
= fs_info
->nodesize
;
3138 fi_args
->sectorsize
= fs_info
->sectorsize
;
3139 fi_args
->clone_alignment
= fs_info
->sectorsize
;
3141 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
3148 static long btrfs_ioctl_dev_info(struct btrfs_fs_info
*fs_info
,
3151 struct btrfs_ioctl_dev_info_args
*di_args
;
3152 struct btrfs_device
*dev
;
3154 char *s_uuid
= NULL
;
3156 di_args
= memdup_user(arg
, sizeof(*di_args
));
3157 if (IS_ERR(di_args
))
3158 return PTR_ERR(di_args
);
3160 if (!btrfs_is_empty_uuid(di_args
->uuid
))
3161 s_uuid
= di_args
->uuid
;
3164 dev
= btrfs_find_device(fs_info
, di_args
->devid
, s_uuid
, NULL
);
3171 di_args
->devid
= dev
->devid
;
3172 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
3173 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
3174 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
3176 strncpy(di_args
->path
, rcu_str_deref(dev
->name
),
3177 sizeof(di_args
->path
) - 1);
3178 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
3180 di_args
->path
[0] = '\0';
3185 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
3192 static struct page
*extent_same_get_page(struct inode
*inode
, pgoff_t index
)
3196 page
= grab_cache_page(inode
->i_mapping
, index
);
3198 return ERR_PTR(-ENOMEM
);
3200 if (!PageUptodate(page
)) {
3203 ret
= btrfs_readpage(NULL
, page
);
3205 return ERR_PTR(ret
);
3207 if (!PageUptodate(page
)) {
3210 return ERR_PTR(-EIO
);
3212 if (page
->mapping
!= inode
->i_mapping
) {
3215 return ERR_PTR(-EAGAIN
);
3222 static int gather_extent_pages(struct inode
*inode
, struct page
**pages
,
3223 int num_pages
, u64 off
)
3226 pgoff_t index
= off
>> PAGE_SHIFT
;
3228 for (i
= 0; i
< num_pages
; i
++) {
3230 pages
[i
] = extent_same_get_page(inode
, index
+ i
);
3231 if (IS_ERR(pages
[i
])) {
3232 int err
= PTR_ERR(pages
[i
]);
3243 static int lock_extent_range(struct inode
*inode
, u64 off
, u64 len
,
3244 bool retry_range_locking
)
3247 * Do any pending delalloc/csum calculations on inode, one way or
3248 * another, and lock file content.
3249 * The locking order is:
3252 * 2) range in the inode's io tree
3255 struct btrfs_ordered_extent
*ordered
;
3256 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
3257 ordered
= btrfs_lookup_first_ordered_extent(inode
,
3260 ordered
->file_offset
+ ordered
->len
<= off
||
3261 ordered
->file_offset
>= off
+ len
) &&
3262 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
3263 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
)) {
3265 btrfs_put_ordered_extent(ordered
);
3268 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
3270 btrfs_put_ordered_extent(ordered
);
3271 if (!retry_range_locking
)
3273 btrfs_wait_ordered_range(inode
, off
, len
);
3278 static void btrfs_double_inode_unlock(struct inode
*inode1
, struct inode
*inode2
)
3280 inode_unlock(inode1
);
3281 inode_unlock(inode2
);
3284 static void btrfs_double_inode_lock(struct inode
*inode1
, struct inode
*inode2
)
3286 if (inode1
< inode2
)
3287 swap(inode1
, inode2
);
3289 inode_lock_nested(inode1
, I_MUTEX_PARENT
);
3290 inode_lock_nested(inode2
, I_MUTEX_CHILD
);
3293 static void btrfs_double_extent_unlock(struct inode
*inode1
, u64 loff1
,
3294 struct inode
*inode2
, u64 loff2
, u64 len
)
3296 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
3297 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
3300 static int btrfs_double_extent_lock(struct inode
*inode1
, u64 loff1
,
3301 struct inode
*inode2
, u64 loff2
, u64 len
,
3302 bool retry_range_locking
)
3306 if (inode1
< inode2
) {
3307 swap(inode1
, inode2
);
3310 ret
= lock_extent_range(inode1
, loff1
, len
, retry_range_locking
);
3313 ret
= lock_extent_range(inode2
, loff2
, len
, retry_range_locking
);
3315 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
,
3322 struct page
**src_pages
;
3323 struct page
**dst_pages
;
3326 static void btrfs_cmp_data_free(struct cmp_pages
*cmp
)
3331 for (i
= 0; i
< cmp
->num_pages
; i
++) {
3332 pg
= cmp
->src_pages
[i
];
3336 cmp
->src_pages
[i
] = NULL
;
3338 pg
= cmp
->dst_pages
[i
];
3342 cmp
->dst_pages
[i
] = NULL
;
3347 static int btrfs_cmp_data_prepare(struct inode
*src
, u64 loff
,
3348 struct inode
*dst
, u64 dst_loff
,
3349 u64 len
, struct cmp_pages
*cmp
)
3352 int num_pages
= PAGE_ALIGN(len
) >> PAGE_SHIFT
;
3354 cmp
->num_pages
= num_pages
;
3356 ret
= gather_extent_pages(src
, cmp
->src_pages
, num_pages
, loff
);
3360 ret
= gather_extent_pages(dst
, cmp
->dst_pages
, num_pages
, dst_loff
);
3364 btrfs_cmp_data_free(cmp
);
3368 static int btrfs_cmp_data(u64 len
, struct cmp_pages
*cmp
)
3372 struct page
*src_page
, *dst_page
;
3373 unsigned int cmp_len
= PAGE_SIZE
;
3374 void *addr
, *dst_addr
;
3378 if (len
< PAGE_SIZE
)
3381 BUG_ON(i
>= cmp
->num_pages
);
3383 src_page
= cmp
->src_pages
[i
];
3384 dst_page
= cmp
->dst_pages
[i
];
3385 ASSERT(PageLocked(src_page
));
3386 ASSERT(PageLocked(dst_page
));
3388 addr
= kmap_atomic(src_page
);
3389 dst_addr
= kmap_atomic(dst_page
);
3391 flush_dcache_page(src_page
);
3392 flush_dcache_page(dst_page
);
3394 if (memcmp(addr
, dst_addr
, cmp_len
))
3397 kunmap_atomic(addr
);
3398 kunmap_atomic(dst_addr
);
3410 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64
*plen
,
3414 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
3416 if (off
+ olen
> inode
->i_size
|| off
+ olen
< off
)
3419 /* if we extend to eof, continue to block boundary */
3420 if (off
+ len
== inode
->i_size
)
3421 *plen
= len
= ALIGN(inode
->i_size
, bs
) - off
;
3423 /* Check that we are block aligned - btrfs_clone() requires this */
3424 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
3430 static int btrfs_extent_same_range(struct inode
*src
, u64 loff
, u64 olen
,
3431 struct inode
*dst
, u64 dst_loff
,
3432 struct cmp_pages
*cmp
)
3436 bool same_inode
= (src
== dst
);
3437 u64 same_lock_start
= 0;
3438 u64 same_lock_len
= 0;
3440 ret
= extent_same_check_offsets(src
, loff
, &len
, olen
);
3444 ret
= extent_same_check_offsets(dst
, dst_loff
, &len
, olen
);
3450 * Single inode case wants the same checks, except we
3451 * don't want our length pushed out past i_size as
3452 * comparing that data range makes no sense.
3454 * extent_same_check_offsets() will do this for an
3455 * unaligned length at i_size, so catch it here and
3456 * reject the request.
3458 * This effectively means we require aligned extents
3459 * for the single-inode case, whereas the other cases
3460 * allow an unaligned length so long as it ends at
3466 /* Check for overlapping ranges */
3467 if (dst_loff
+ len
> loff
&& dst_loff
< loff
+ len
)
3470 same_lock_start
= min_t(u64
, loff
, dst_loff
);
3471 same_lock_len
= max_t(u64
, loff
, dst_loff
) + len
- same_lock_start
;
3474 * If the source and destination inodes are different, the
3475 * source's range end offset matches the source's i_size, that
3476 * i_size is not a multiple of the sector size, and the
3477 * destination range does not go past the destination's i_size,
3478 * we must round down the length to the nearest sector size
3479 * multiple. If we don't do this adjustment we end replacing
3480 * with zeroes the bytes in the range that starts at the
3481 * deduplication range's end offset and ends at the next sector
3484 if (loff
+ olen
== i_size_read(src
) &&
3485 dst_loff
+ len
< i_size_read(dst
)) {
3486 const u64 sz
= BTRFS_I(src
)->root
->fs_info
->sectorsize
;
3488 len
= round_down(i_size_read(src
), sz
) - loff
;
3494 ret
= btrfs_cmp_data_prepare(src
, loff
, dst
, dst_loff
, olen
, cmp
);
3499 ret
= lock_extent_range(src
, same_lock_start
, same_lock_len
,
3502 ret
= btrfs_double_extent_lock(src
, loff
, dst
, dst_loff
, len
,
3505 * If one of the inodes has dirty pages in the respective range or
3506 * ordered extents, we need to flush dellaloc and wait for all ordered
3507 * extents in the range. We must unlock the pages and the ranges in the
3508 * io trees to avoid deadlocks when flushing delalloc (requires locking
3509 * pages) and when waiting for ordered extents to complete (they require
3512 if (ret
== -EAGAIN
) {
3514 * Ranges in the io trees already unlocked. Now unlock all
3515 * pages before waiting for all IO to complete.
3517 btrfs_cmp_data_free(cmp
);
3519 btrfs_wait_ordered_range(src
, same_lock_start
,
3522 btrfs_wait_ordered_range(src
, loff
, len
);
3523 btrfs_wait_ordered_range(dst
, dst_loff
, len
);
3529 /* ranges in the io trees already unlocked */
3530 btrfs_cmp_data_free(cmp
);
3534 /* pass original length for comparison so we stay within i_size */
3535 ret
= btrfs_cmp_data(olen
, cmp
);
3537 ret
= btrfs_clone(src
, dst
, loff
, olen
, len
, dst_loff
, 1);
3540 unlock_extent(&BTRFS_I(src
)->io_tree
, same_lock_start
,
3541 same_lock_start
+ same_lock_len
- 1);
3543 btrfs_double_extent_unlock(src
, loff
, dst
, dst_loff
, len
);
3545 btrfs_cmp_data_free(cmp
);
3550 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3552 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 olen
,
3553 struct inode
*dst
, u64 dst_loff
)
3556 struct cmp_pages cmp
;
3557 int num_pages
= PAGE_ALIGN(BTRFS_MAX_DEDUPE_LEN
) >> PAGE_SHIFT
;
3558 bool same_inode
= (src
== dst
);
3559 u64 i
, tail_len
, chunk_count
;
3567 btrfs_double_inode_lock(src
, dst
);
3569 /* don't make the dst file partly checksummed */
3570 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3571 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
3576 tail_len
= olen
% BTRFS_MAX_DEDUPE_LEN
;
3577 chunk_count
= div_u64(olen
, BTRFS_MAX_DEDUPE_LEN
);
3578 if (chunk_count
== 0)
3579 num_pages
= PAGE_ALIGN(tail_len
) >> PAGE_SHIFT
;
3582 * If deduping ranges in the same inode, locking rules make it
3583 * mandatory to always lock pages in ascending order to avoid deadlocks
3584 * with concurrent tasks (such as starting writeback/delalloc).
3586 if (same_inode
&& dst_loff
< loff
)
3587 swap(loff
, dst_loff
);
3590 * We must gather up all the pages before we initiate our extent
3591 * locking. We use an array for the page pointers. Size of the array is
3592 * bounded by len, which is in turn bounded by BTRFS_MAX_DEDUPE_LEN.
3594 cmp
.src_pages
= kvmalloc_array(num_pages
, sizeof(struct page
*),
3595 GFP_KERNEL
| __GFP_ZERO
);
3596 cmp
.dst_pages
= kvmalloc_array(num_pages
, sizeof(struct page
*),
3597 GFP_KERNEL
| __GFP_ZERO
);
3598 if (!cmp
.src_pages
|| !cmp
.dst_pages
) {
3603 for (i
= 0; i
< chunk_count
; i
++) {
3604 ret
= btrfs_extent_same_range(src
, loff
, BTRFS_MAX_DEDUPE_LEN
,
3605 dst
, dst_loff
, &cmp
);
3609 loff
+= BTRFS_MAX_DEDUPE_LEN
;
3610 dst_loff
+= BTRFS_MAX_DEDUPE_LEN
;
3614 ret
= btrfs_extent_same_range(src
, loff
, tail_len
, dst
,
3618 kvfree(cmp
.src_pages
);
3619 kvfree(cmp
.dst_pages
);
3625 btrfs_double_inode_unlock(src
, dst
);
3630 static int clone_finish_inode_update(struct btrfs_trans_handle
*trans
,
3631 struct inode
*inode
,
3637 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3640 inode_inc_iversion(inode
);
3641 if (!no_time_update
)
3642 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
3644 * We round up to the block size at eof when determining which
3645 * extents to clone above, but shouldn't round up the file size.
3647 if (endoff
> destoff
+ olen
)
3648 endoff
= destoff
+ olen
;
3649 if (endoff
> inode
->i_size
)
3650 btrfs_i_size_write(BTRFS_I(inode
), endoff
);
3652 ret
= btrfs_update_inode(trans
, root
, inode
);
3654 btrfs_abort_transaction(trans
, ret
);
3655 btrfs_end_transaction(trans
);
3658 ret
= btrfs_end_transaction(trans
);
3663 static void clone_update_extent_map(struct btrfs_inode
*inode
,
3664 const struct btrfs_trans_handle
*trans
,
3665 const struct btrfs_path
*path
,
3666 const u64 hole_offset
,
3669 struct extent_map_tree
*em_tree
= &inode
->extent_tree
;
3670 struct extent_map
*em
;
3673 em
= alloc_extent_map();
3675 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &inode
->runtime_flags
);
3680 struct btrfs_file_extent_item
*fi
;
3682 fi
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3683 struct btrfs_file_extent_item
);
3684 btrfs_extent_item_to_extent_map(inode
, path
, fi
, false, em
);
3685 em
->generation
= -1;
3686 if (btrfs_file_extent_type(path
->nodes
[0], fi
) ==
3687 BTRFS_FILE_EXTENT_INLINE
)
3688 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3689 &inode
->runtime_flags
);
3691 em
->start
= hole_offset
;
3693 em
->ram_bytes
= em
->len
;
3694 em
->orig_start
= hole_offset
;
3695 em
->block_start
= EXTENT_MAP_HOLE
;
3697 em
->orig_block_len
= 0;
3698 em
->compress_type
= BTRFS_COMPRESS_NONE
;
3699 em
->generation
= trans
->transid
;
3703 write_lock(&em_tree
->lock
);
3704 ret
= add_extent_mapping(em_tree
, em
, 1);
3705 write_unlock(&em_tree
->lock
);
3706 if (ret
!= -EEXIST
) {
3707 free_extent_map(em
);
3710 btrfs_drop_extent_cache(inode
, em
->start
,
3711 em
->start
+ em
->len
- 1, 0);
3715 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &inode
->runtime_flags
);
3719 * Make sure we do not end up inserting an inline extent into a file that has
3720 * already other (non-inline) extents. If a file has an inline extent it can
3721 * not have any other extents and the (single) inline extent must start at the
3722 * file offset 0. Failing to respect these rules will lead to file corruption,
3723 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3725 * We can have extents that have been already written to disk or we can have
3726 * dirty ranges still in delalloc, in which case the extent maps and items are
3727 * created only when we run delalloc, and the delalloc ranges might fall outside
3728 * the range we are currently locking in the inode's io tree. So we check the
3729 * inode's i_size because of that (i_size updates are done while holding the
3730 * i_mutex, which we are holding here).
3731 * We also check to see if the inode has a size not greater than "datal" but has
3732 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3733 * protected against such concurrent fallocate calls by the i_mutex).
3735 * If the file has no extents but a size greater than datal, do not allow the
3736 * copy because we would need turn the inline extent into a non-inline one (even
3737 * with NO_HOLES enabled). If we find our destination inode only has one inline
3738 * extent, just overwrite it with the source inline extent if its size is less
3739 * than the source extent's size, or we could copy the source inline extent's
3740 * data into the destination inode's inline extent if the later is greater then
3743 static int clone_copy_inline_extent(struct inode
*dst
,
3744 struct btrfs_trans_handle
*trans
,
3745 struct btrfs_path
*path
,
3746 struct btrfs_key
*new_key
,
3747 const u64 drop_start
,
3753 struct btrfs_fs_info
*fs_info
= btrfs_sb(dst
->i_sb
);
3754 struct btrfs_root
*root
= BTRFS_I(dst
)->root
;
3755 const u64 aligned_end
= ALIGN(new_key
->offset
+ datal
,
3756 fs_info
->sectorsize
);
3758 struct btrfs_key key
;
3760 if (new_key
->offset
> 0)
3763 key
.objectid
= btrfs_ino(BTRFS_I(dst
));
3764 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3766 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3769 } else if (ret
> 0) {
3770 if (path
->slots
[0] >= btrfs_header_nritems(path
->nodes
[0])) {
3771 ret
= btrfs_next_leaf(root
, path
);
3775 goto copy_inline_extent
;
3777 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
3778 if (key
.objectid
== btrfs_ino(BTRFS_I(dst
)) &&
3779 key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3780 ASSERT(key
.offset
> 0);
3783 } else if (i_size_read(dst
) <= datal
) {
3784 struct btrfs_file_extent_item
*ei
;
3788 * If the file size is <= datal, make sure there are no other
3789 * extents following (can happen do to an fallocate call with
3790 * the flag FALLOC_FL_KEEP_SIZE).
3792 ei
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3793 struct btrfs_file_extent_item
);
3795 * If it's an inline extent, it can not have other extents
3798 if (btrfs_file_extent_type(path
->nodes
[0], ei
) ==
3799 BTRFS_FILE_EXTENT_INLINE
)
3800 goto copy_inline_extent
;
3802 ext_len
= btrfs_file_extent_num_bytes(path
->nodes
[0], ei
);
3803 if (ext_len
> aligned_end
)
3806 ret
= btrfs_next_item(root
, path
);
3809 } else if (ret
== 0) {
3810 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3812 if (key
.objectid
== btrfs_ino(BTRFS_I(dst
)) &&
3813 key
.type
== BTRFS_EXTENT_DATA_KEY
)
3820 * We have no extent items, or we have an extent at offset 0 which may
3821 * or may not be inlined. All these cases are dealt the same way.
3823 if (i_size_read(dst
) > datal
) {
3825 * If the destination inode has an inline extent...
3826 * This would require copying the data from the source inline
3827 * extent into the beginning of the destination's inline extent.
3828 * But this is really complex, both extents can be compressed
3829 * or just one of them, which would require decompressing and
3830 * re-compressing data (which could increase the new compressed
3831 * size, not allowing the compressed data to fit anymore in an
3833 * So just don't support this case for now (it should be rare,
3834 * we are not really saving space when cloning inline extents).
3839 btrfs_release_path(path
);
3840 ret
= btrfs_drop_extents(trans
, root
, dst
, drop_start
, aligned_end
, 1);
3843 ret
= btrfs_insert_empty_item(trans
, root
, path
, new_key
, size
);
3848 const u32 start
= btrfs_file_extent_calc_inline_size(0);
3850 memmove(inline_data
+ start
, inline_data
+ start
+ skip
, datal
);
3853 write_extent_buffer(path
->nodes
[0], inline_data
,
3854 btrfs_item_ptr_offset(path
->nodes
[0],
3857 inode_add_bytes(dst
, datal
);
3863 * btrfs_clone() - clone a range from inode file to another
3865 * @src: Inode to clone from
3866 * @inode: Inode to clone to
3867 * @off: Offset within source to start clone from
3868 * @olen: Original length, passed by user, of range to clone
3869 * @olen_aligned: Block-aligned value of olen
3870 * @destoff: Offset within @inode to start clone
3871 * @no_time_update: Whether to update mtime/ctime on the target inode
3873 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
3874 const u64 off
, const u64 olen
, const u64 olen_aligned
,
3875 const u64 destoff
, int no_time_update
)
3877 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3878 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3879 struct btrfs_path
*path
= NULL
;
3880 struct extent_buffer
*leaf
;
3881 struct btrfs_trans_handle
*trans
;
3883 struct btrfs_key key
;
3887 const u64 len
= olen_aligned
;
3888 u64 last_dest_end
= destoff
;
3891 buf
= kvmalloc(fs_info
->nodesize
, GFP_KERNEL
);
3895 path
= btrfs_alloc_path();
3901 path
->reada
= READA_FORWARD
;
3903 key
.objectid
= btrfs_ino(BTRFS_I(src
));
3904 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3908 u64 next_key_min_offset
= key
.offset
+ 1;
3911 * note the key will change type as we walk through the
3914 path
->leave_spinning
= 1;
3915 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
3920 * First search, if no extent item that starts at offset off was
3921 * found but the previous item is an extent item, it's possible
3922 * it might overlap our target range, therefore process it.
3924 if (key
.offset
== off
&& ret
> 0 && path
->slots
[0] > 0) {
3925 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3926 path
->slots
[0] - 1);
3927 if (key
.type
== BTRFS_EXTENT_DATA_KEY
)
3931 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3933 if (path
->slots
[0] >= nritems
) {
3934 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
3939 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3941 leaf
= path
->nodes
[0];
3942 slot
= path
->slots
[0];
3944 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
3945 if (key
.type
> BTRFS_EXTENT_DATA_KEY
||
3946 key
.objectid
!= btrfs_ino(BTRFS_I(src
)))
3949 if (key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3950 struct btrfs_file_extent_item
*extent
;
3953 struct btrfs_key new_key
;
3954 u64 disko
= 0, diskl
= 0;
3955 u64 datao
= 0, datal
= 0;
3959 extent
= btrfs_item_ptr(leaf
, slot
,
3960 struct btrfs_file_extent_item
);
3961 comp
= btrfs_file_extent_compression(leaf
, extent
);
3962 type
= btrfs_file_extent_type(leaf
, extent
);
3963 if (type
== BTRFS_FILE_EXTENT_REG
||
3964 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3965 disko
= btrfs_file_extent_disk_bytenr(leaf
,
3967 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
3969 datao
= btrfs_file_extent_offset(leaf
, extent
);
3970 datal
= btrfs_file_extent_num_bytes(leaf
,
3972 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3973 /* take upper bound, may be compressed */
3974 datal
= btrfs_file_extent_ram_bytes(leaf
,
3979 * The first search might have left us at an extent
3980 * item that ends before our target range's start, can
3981 * happen if we have holes and NO_HOLES feature enabled.
3983 if (key
.offset
+ datal
<= off
) {
3986 } else if (key
.offset
>= off
+ len
) {
3989 next_key_min_offset
= key
.offset
+ datal
;
3990 size
= btrfs_item_size_nr(leaf
, slot
);
3991 read_extent_buffer(leaf
, buf
,
3992 btrfs_item_ptr_offset(leaf
, slot
),
3995 btrfs_release_path(path
);
3996 path
->leave_spinning
= 0;
3998 memcpy(&new_key
, &key
, sizeof(new_key
));
3999 new_key
.objectid
= btrfs_ino(BTRFS_I(inode
));
4000 if (off
<= key
.offset
)
4001 new_key
.offset
= key
.offset
+ destoff
- off
;
4003 new_key
.offset
= destoff
;
4006 * Deal with a hole that doesn't have an extent item
4007 * that represents it (NO_HOLES feature enabled).
4008 * This hole is either in the middle of the cloning
4009 * range or at the beginning (fully overlaps it or
4010 * partially overlaps it).
4012 if (new_key
.offset
!= last_dest_end
)
4013 drop_start
= last_dest_end
;
4015 drop_start
= new_key
.offset
;
4018 * 1 - adjusting old extent (we may have to split it)
4019 * 1 - add new extent
4022 trans
= btrfs_start_transaction(root
, 3);
4023 if (IS_ERR(trans
)) {
4024 ret
= PTR_ERR(trans
);
4028 if (type
== BTRFS_FILE_EXTENT_REG
||
4029 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
4031 * a | --- range to clone ---| b
4032 * | ------------- extent ------------- |
4035 /* subtract range b */
4036 if (key
.offset
+ datal
> off
+ len
)
4037 datal
= off
+ len
- key
.offset
;
4039 /* subtract range a */
4040 if (off
> key
.offset
) {
4041 datao
+= off
- key
.offset
;
4042 datal
-= off
- key
.offset
;
4045 ret
= btrfs_drop_extents(trans
, root
, inode
,
4047 new_key
.offset
+ datal
,
4050 if (ret
!= -EOPNOTSUPP
)
4051 btrfs_abort_transaction(trans
,
4053 btrfs_end_transaction(trans
);
4057 ret
= btrfs_insert_empty_item(trans
, root
, path
,
4060 btrfs_abort_transaction(trans
, ret
);
4061 btrfs_end_transaction(trans
);
4065 leaf
= path
->nodes
[0];
4066 slot
= path
->slots
[0];
4067 write_extent_buffer(leaf
, buf
,
4068 btrfs_item_ptr_offset(leaf
, slot
),
4071 extent
= btrfs_item_ptr(leaf
, slot
,
4072 struct btrfs_file_extent_item
);
4074 /* disko == 0 means it's a hole */
4078 btrfs_set_file_extent_offset(leaf
, extent
,
4080 btrfs_set_file_extent_num_bytes(leaf
, extent
,
4084 inode_add_bytes(inode
, datal
);
4085 ret
= btrfs_inc_extent_ref(trans
,
4088 root
->root_key
.objectid
,
4089 btrfs_ino(BTRFS_I(inode
)),
4090 new_key
.offset
- datao
);
4092 btrfs_abort_transaction(trans
,
4094 btrfs_end_transaction(trans
);
4099 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
4103 if (off
> key
.offset
) {
4104 skip
= off
- key
.offset
;
4105 new_key
.offset
+= skip
;
4108 if (key
.offset
+ datal
> off
+ len
)
4109 trim
= key
.offset
+ datal
- (off
+ len
);
4111 if (comp
&& (skip
|| trim
)) {
4113 btrfs_end_transaction(trans
);
4116 size
-= skip
+ trim
;
4117 datal
-= skip
+ trim
;
4119 ret
= clone_copy_inline_extent(inode
,
4126 if (ret
!= -EOPNOTSUPP
)
4127 btrfs_abort_transaction(trans
,
4129 btrfs_end_transaction(trans
);
4132 leaf
= path
->nodes
[0];
4133 slot
= path
->slots
[0];
4136 /* If we have an implicit hole (NO_HOLES feature). */
4137 if (drop_start
< new_key
.offset
)
4138 clone_update_extent_map(BTRFS_I(inode
), trans
,
4140 new_key
.offset
- drop_start
);
4142 clone_update_extent_map(BTRFS_I(inode
), trans
,
4145 btrfs_mark_buffer_dirty(leaf
);
4146 btrfs_release_path(path
);
4148 last_dest_end
= ALIGN(new_key
.offset
+ datal
,
4149 fs_info
->sectorsize
);
4150 ret
= clone_finish_inode_update(trans
, inode
,
4156 if (new_key
.offset
+ datal
>= destoff
+ len
)
4159 btrfs_release_path(path
);
4160 key
.offset
= next_key_min_offset
;
4162 if (fatal_signal_pending(current
)) {
4169 if (last_dest_end
< destoff
+ len
) {
4171 * We have an implicit hole (NO_HOLES feature is enabled) that
4172 * fully or partially overlaps our cloning range at its end.
4174 btrfs_release_path(path
);
4177 * 1 - remove extent(s)
4180 trans
= btrfs_start_transaction(root
, 2);
4181 if (IS_ERR(trans
)) {
4182 ret
= PTR_ERR(trans
);
4185 ret
= btrfs_drop_extents(trans
, root
, inode
,
4186 last_dest_end
, destoff
+ len
, 1);
4188 if (ret
!= -EOPNOTSUPP
)
4189 btrfs_abort_transaction(trans
, ret
);
4190 btrfs_end_transaction(trans
);
4193 clone_update_extent_map(BTRFS_I(inode
), trans
, NULL
,
4195 destoff
+ len
- last_dest_end
);
4196 ret
= clone_finish_inode_update(trans
, inode
, destoff
+ len
,
4197 destoff
, olen
, no_time_update
);
4201 btrfs_free_path(path
);
4206 static noinline
int btrfs_clone_files(struct file
*file
, struct file
*file_src
,
4207 u64 off
, u64 olen
, u64 destoff
)
4209 struct inode
*inode
= file_inode(file
);
4210 struct inode
*src
= file_inode(file_src
);
4211 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4212 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4215 u64 bs
= fs_info
->sb
->s_blocksize
;
4216 int same_inode
= src
== inode
;
4220 * - split compressed inline extents. annoying: we need to
4221 * decompress into destination's address_space (the file offset
4222 * may change, so source mapping won't do), then recompress (or
4223 * otherwise reinsert) a subrange.
4225 * - split destination inode's inline extents. The inline extents can
4226 * be either compressed or non-compressed.
4229 if (btrfs_root_readonly(root
))
4232 if (file_src
->f_path
.mnt
!= file
->f_path
.mnt
||
4233 src
->i_sb
!= inode
->i_sb
)
4236 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
4240 btrfs_double_inode_lock(src
, inode
);
4245 /* don't make the dst file partly checksummed */
4246 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
4247 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)) {
4252 /* determine range to clone */
4254 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
4257 olen
= len
= src
->i_size
- off
;
4258 /* if we extend to eof, continue to block boundary */
4259 if (off
+ len
== src
->i_size
)
4260 len
= ALIGN(src
->i_size
, bs
) - off
;
4267 /* verify the end result is block aligned */
4268 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
4269 !IS_ALIGNED(destoff
, bs
))
4272 /* verify if ranges are overlapped within the same file */
4274 if (destoff
+ len
> off
&& destoff
< off
+ len
)
4278 if (destoff
> inode
->i_size
) {
4279 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
4285 * Lock the target range too. Right after we replace the file extent
4286 * items in the fs tree (which now point to the cloned data), we might
4287 * have a worker replace them with extent items relative to a write
4288 * operation that was issued before this clone operation (i.e. confront
4289 * with inode.c:btrfs_finish_ordered_io).
4292 u64 lock_start
= min_t(u64
, off
, destoff
);
4293 u64 lock_len
= max_t(u64
, off
, destoff
) + len
- lock_start
;
4295 ret
= lock_extent_range(src
, lock_start
, lock_len
, true);
4297 ret
= btrfs_double_extent_lock(src
, off
, inode
, destoff
, len
,
4302 /* ranges in the io trees already unlocked */
4306 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
, 0);
4309 u64 lock_start
= min_t(u64
, off
, destoff
);
4310 u64 lock_end
= max_t(u64
, off
, destoff
) + len
- 1;
4312 unlock_extent(&BTRFS_I(src
)->io_tree
, lock_start
, lock_end
);
4314 btrfs_double_extent_unlock(src
, off
, inode
, destoff
, len
);
4317 * Truncate page cache pages so that future reads will see the cloned
4318 * data immediately and not the previous data.
4320 truncate_inode_pages_range(&inode
->i_data
,
4321 round_down(destoff
, PAGE_SIZE
),
4322 round_up(destoff
+ len
, PAGE_SIZE
) - 1);
4325 btrfs_double_inode_unlock(src
, inode
);
4331 int btrfs_remap_file_range(struct file
*src_file
, loff_t off
,
4332 struct file
*dst_file
, loff_t destoff
, u64 len
,
4333 unsigned int remap_flags
)
4335 if (remap_flags
& ~(REMAP_FILE_DEDUP
| REMAP_FILE_ADVISORY
))
4338 if (remap_flags
& REMAP_FILE_DEDUP
) {
4339 struct inode
*src
= file_inode(src_file
);
4340 struct inode
*dst
= file_inode(dst_file
);
4341 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
4343 if (WARN_ON_ONCE(bs
< PAGE_SIZE
)) {
4345 * Btrfs does not support blocksize < page_size. As a
4346 * result, btrfs_cmp_data() won't correctly handle
4347 * this situation without an update.
4352 return btrfs_extent_same(src
, off
, len
, dst
, destoff
);
4355 return btrfs_clone_files(dst_file
, src_file
, off
, len
, destoff
);
4358 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
4360 struct inode
*inode
= file_inode(file
);
4361 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4362 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4363 struct btrfs_root
*new_root
;
4364 struct btrfs_dir_item
*di
;
4365 struct btrfs_trans_handle
*trans
;
4366 struct btrfs_path
*path
;
4367 struct btrfs_key location
;
4368 struct btrfs_disk_key disk_key
;
4373 if (!capable(CAP_SYS_ADMIN
))
4376 ret
= mnt_want_write_file(file
);
4380 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
4386 objectid
= BTRFS_FS_TREE_OBJECTID
;
4388 location
.objectid
= objectid
;
4389 location
.type
= BTRFS_ROOT_ITEM_KEY
;
4390 location
.offset
= (u64
)-1;
4392 new_root
= btrfs_read_fs_root_no_name(fs_info
, &location
);
4393 if (IS_ERR(new_root
)) {
4394 ret
= PTR_ERR(new_root
);
4397 if (!is_fstree(new_root
->objectid
)) {
4402 path
= btrfs_alloc_path();
4407 path
->leave_spinning
= 1;
4409 trans
= btrfs_start_transaction(root
, 1);
4410 if (IS_ERR(trans
)) {
4411 btrfs_free_path(path
);
4412 ret
= PTR_ERR(trans
);
4416 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
4417 di
= btrfs_lookup_dir_item(trans
, fs_info
->tree_root
, path
,
4418 dir_id
, "default", 7, 1);
4419 if (IS_ERR_OR_NULL(di
)) {
4420 btrfs_free_path(path
);
4421 btrfs_end_transaction(trans
);
4423 "Umm, you don't have the default diritem, this isn't going to work");
4428 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
4429 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
4430 btrfs_mark_buffer_dirty(path
->nodes
[0]);
4431 btrfs_free_path(path
);
4433 btrfs_set_fs_incompat(fs_info
, DEFAULT_SUBVOL
);
4434 btrfs_end_transaction(trans
);
4436 mnt_drop_write_file(file
);
4440 static void get_block_group_info(struct list_head
*groups_list
,
4441 struct btrfs_ioctl_space_info
*space
)
4443 struct btrfs_block_group_cache
*block_group
;
4445 space
->total_bytes
= 0;
4446 space
->used_bytes
= 0;
4448 list_for_each_entry(block_group
, groups_list
, list
) {
4449 space
->flags
= block_group
->flags
;
4450 space
->total_bytes
+= block_group
->key
.offset
;
4451 space
->used_bytes
+=
4452 btrfs_block_group_used(&block_group
->item
);
4456 static long btrfs_ioctl_space_info(struct btrfs_fs_info
*fs_info
,
4459 struct btrfs_ioctl_space_args space_args
;
4460 struct btrfs_ioctl_space_info space
;
4461 struct btrfs_ioctl_space_info
*dest
;
4462 struct btrfs_ioctl_space_info
*dest_orig
;
4463 struct btrfs_ioctl_space_info __user
*user_dest
;
4464 struct btrfs_space_info
*info
;
4465 static const u64 types
[] = {
4466 BTRFS_BLOCK_GROUP_DATA
,
4467 BTRFS_BLOCK_GROUP_SYSTEM
,
4468 BTRFS_BLOCK_GROUP_METADATA
,
4469 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
4477 if (copy_from_user(&space_args
,
4478 (struct btrfs_ioctl_space_args __user
*)arg
,
4479 sizeof(space_args
)))
4482 for (i
= 0; i
< num_types
; i
++) {
4483 struct btrfs_space_info
*tmp
;
4487 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
,
4489 if (tmp
->flags
== types
[i
]) {
4499 down_read(&info
->groups_sem
);
4500 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
4501 if (!list_empty(&info
->block_groups
[c
]))
4504 up_read(&info
->groups_sem
);
4508 * Global block reserve, exported as a space_info
4512 /* space_slots == 0 means they are asking for a count */
4513 if (space_args
.space_slots
== 0) {
4514 space_args
.total_spaces
= slot_count
;
4518 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
4520 alloc_size
= sizeof(*dest
) * slot_count
;
4522 /* we generally have at most 6 or so space infos, one for each raid
4523 * level. So, a whole page should be more than enough for everyone
4525 if (alloc_size
> PAGE_SIZE
)
4528 space_args
.total_spaces
= 0;
4529 dest
= kmalloc(alloc_size
, GFP_KERNEL
);
4534 /* now we have a buffer to copy into */
4535 for (i
= 0; i
< num_types
; i
++) {
4536 struct btrfs_space_info
*tmp
;
4543 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
,
4545 if (tmp
->flags
== types
[i
]) {
4554 down_read(&info
->groups_sem
);
4555 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
4556 if (!list_empty(&info
->block_groups
[c
])) {
4557 get_block_group_info(&info
->block_groups
[c
],
4559 memcpy(dest
, &space
, sizeof(space
));
4561 space_args
.total_spaces
++;
4567 up_read(&info
->groups_sem
);
4571 * Add global block reserve
4574 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
4576 spin_lock(&block_rsv
->lock
);
4577 space
.total_bytes
= block_rsv
->size
;
4578 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
4579 spin_unlock(&block_rsv
->lock
);
4580 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
4581 memcpy(dest
, &space
, sizeof(space
));
4582 space_args
.total_spaces
++;
4585 user_dest
= (struct btrfs_ioctl_space_info __user
*)
4586 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
4588 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
4593 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
4599 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
4602 struct btrfs_trans_handle
*trans
;
4606 trans
= btrfs_attach_transaction_barrier(root
);
4607 if (IS_ERR(trans
)) {
4608 if (PTR_ERR(trans
) != -ENOENT
)
4609 return PTR_ERR(trans
);
4611 /* No running transaction, don't bother */
4612 transid
= root
->fs_info
->last_trans_committed
;
4615 transid
= trans
->transid
;
4616 ret
= btrfs_commit_transaction_async(trans
, 0);
4618 btrfs_end_transaction(trans
);
4623 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
4628 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_fs_info
*fs_info
,
4634 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
4637 transid
= 0; /* current trans */
4639 return btrfs_wait_for_commit(fs_info
, transid
);
4642 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
4644 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
4645 struct btrfs_ioctl_scrub_args
*sa
;
4648 if (!capable(CAP_SYS_ADMIN
))
4651 sa
= memdup_user(arg
, sizeof(*sa
));
4655 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
4656 ret
= mnt_want_write_file(file
);
4661 ret
= btrfs_scrub_dev(fs_info
, sa
->devid
, sa
->start
, sa
->end
,
4662 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
4665 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4668 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
4669 mnt_drop_write_file(file
);
4675 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info
*fs_info
)
4677 if (!capable(CAP_SYS_ADMIN
))
4680 return btrfs_scrub_cancel(fs_info
);
4683 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info
*fs_info
,
4686 struct btrfs_ioctl_scrub_args
*sa
;
4689 if (!capable(CAP_SYS_ADMIN
))
4692 sa
= memdup_user(arg
, sizeof(*sa
));
4696 ret
= btrfs_scrub_progress(fs_info
, sa
->devid
, &sa
->progress
);
4698 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4705 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info
*fs_info
,
4708 struct btrfs_ioctl_get_dev_stats
*sa
;
4711 sa
= memdup_user(arg
, sizeof(*sa
));
4715 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
4720 ret
= btrfs_get_dev_stats(fs_info
, sa
);
4722 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4729 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info
*fs_info
,
4732 struct btrfs_ioctl_dev_replace_args
*p
;
4735 if (!capable(CAP_SYS_ADMIN
))
4738 p
= memdup_user(arg
, sizeof(*p
));
4743 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
4744 if (sb_rdonly(fs_info
->sb
)) {
4748 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
4749 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4751 ret
= btrfs_dev_replace_by_ioctl(fs_info
, p
);
4752 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
4755 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
4756 btrfs_dev_replace_status(fs_info
, p
);
4759 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
4760 p
->result
= btrfs_dev_replace_cancel(fs_info
);
4768 if (copy_to_user(arg
, p
, sizeof(*p
)))
4775 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
4781 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
4782 struct inode_fs_paths
*ipath
= NULL
;
4783 struct btrfs_path
*path
;
4785 if (!capable(CAP_DAC_READ_SEARCH
))
4788 path
= btrfs_alloc_path();
4794 ipa
= memdup_user(arg
, sizeof(*ipa
));
4801 size
= min_t(u32
, ipa
->size
, 4096);
4802 ipath
= init_ipath(size
, root
, path
);
4803 if (IS_ERR(ipath
)) {
4804 ret
= PTR_ERR(ipath
);
4809 ret
= paths_from_inode(ipa
->inum
, ipath
);
4813 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
4814 rel_ptr
= ipath
->fspath
->val
[i
] -
4815 (u64
)(unsigned long)ipath
->fspath
->val
;
4816 ipath
->fspath
->val
[i
] = rel_ptr
;
4819 ret
= copy_to_user((void __user
*)(unsigned long)ipa
->fspath
,
4820 ipath
->fspath
, size
);
4827 btrfs_free_path(path
);
4834 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
4836 struct btrfs_data_container
*inodes
= ctx
;
4837 const size_t c
= 3 * sizeof(u64
);
4839 if (inodes
->bytes_left
>= c
) {
4840 inodes
->bytes_left
-= c
;
4841 inodes
->val
[inodes
->elem_cnt
] = inum
;
4842 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
4843 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
4844 inodes
->elem_cnt
+= 3;
4846 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
4847 inodes
->bytes_left
= 0;
4848 inodes
->elem_missed
+= 3;
4854 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info
*fs_info
,
4855 void __user
*arg
, int version
)
4859 struct btrfs_ioctl_logical_ino_args
*loi
;
4860 struct btrfs_data_container
*inodes
= NULL
;
4861 struct btrfs_path
*path
= NULL
;
4864 if (!capable(CAP_SYS_ADMIN
))
4867 loi
= memdup_user(arg
, sizeof(*loi
));
4869 return PTR_ERR(loi
);
4872 ignore_offset
= false;
4873 size
= min_t(u32
, loi
->size
, SZ_64K
);
4875 /* All reserved bits must be 0 for now */
4876 if (memchr_inv(loi
->reserved
, 0, sizeof(loi
->reserved
))) {
4880 /* Only accept flags we have defined so far */
4881 if (loi
->flags
& ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET
)) {
4885 ignore_offset
= loi
->flags
& BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET
;
4886 size
= min_t(u32
, loi
->size
, SZ_16M
);
4889 path
= btrfs_alloc_path();
4895 inodes
= init_data_container(size
);
4896 if (IS_ERR(inodes
)) {
4897 ret
= PTR_ERR(inodes
);
4902 ret
= iterate_inodes_from_logical(loi
->logical
, fs_info
, path
,
4903 build_ino_list
, inodes
, ignore_offset
);
4909 ret
= copy_to_user((void __user
*)(unsigned long)loi
->inodes
, inodes
,
4915 btrfs_free_path(path
);
4923 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
,
4924 struct btrfs_ioctl_balance_args
*bargs
)
4926 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4928 bargs
->flags
= bctl
->flags
;
4930 if (test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
))
4931 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
4932 if (atomic_read(&fs_info
->balance_pause_req
))
4933 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
4934 if (atomic_read(&fs_info
->balance_cancel_req
))
4935 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
4937 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
4938 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
4939 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
4941 spin_lock(&fs_info
->balance_lock
);
4942 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4943 spin_unlock(&fs_info
->balance_lock
);
4946 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
4948 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4949 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4950 struct btrfs_ioctl_balance_args
*bargs
;
4951 struct btrfs_balance_control
*bctl
;
4952 bool need_unlock
; /* for mut. excl. ops lock */
4955 if (!capable(CAP_SYS_ADMIN
))
4958 ret
= mnt_want_write_file(file
);
4963 if (!test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
4964 mutex_lock(&fs_info
->balance_mutex
);
4970 * mut. excl. ops lock is locked. Three possibilities:
4971 * (1) some other op is running
4972 * (2) balance is running
4973 * (3) balance is paused -- special case (think resume)
4975 mutex_lock(&fs_info
->balance_mutex
);
4976 if (fs_info
->balance_ctl
) {
4977 /* this is either (2) or (3) */
4978 if (!test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
4979 mutex_unlock(&fs_info
->balance_mutex
);
4981 * Lock released to allow other waiters to continue,
4982 * we'll reexamine the status again.
4984 mutex_lock(&fs_info
->balance_mutex
);
4986 if (fs_info
->balance_ctl
&&
4987 !test_bit(BTRFS_FS_BALANCE_RUNNING
, &fs_info
->flags
)) {
4989 need_unlock
= false;
4993 mutex_unlock(&fs_info
->balance_mutex
);
4997 mutex_unlock(&fs_info
->balance_mutex
);
5003 mutex_unlock(&fs_info
->balance_mutex
);
5004 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
5009 BUG_ON(!test_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
));
5012 bargs
= memdup_user(arg
, sizeof(*bargs
));
5013 if (IS_ERR(bargs
)) {
5014 ret
= PTR_ERR(bargs
);
5018 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
5019 if (!fs_info
->balance_ctl
) {
5024 bctl
= fs_info
->balance_ctl
;
5025 spin_lock(&fs_info
->balance_lock
);
5026 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
5027 spin_unlock(&fs_info
->balance_lock
);
5035 if (fs_info
->balance_ctl
) {
5040 bctl
= kzalloc(sizeof(*bctl
), GFP_KERNEL
);
5047 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
5048 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
5049 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
5051 bctl
->flags
= bargs
->flags
;
5053 /* balance everything - no filters */
5054 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
5057 if (bctl
->flags
& ~(BTRFS_BALANCE_ARGS_MASK
| BTRFS_BALANCE_TYPE_MASK
)) {
5064 * Ownership of bctl and filesystem flag BTRFS_FS_EXCL_OP goes to
5065 * btrfs_balance. bctl is freed in reset_balance_state, or, if
5066 * restriper was paused all the way until unmount, in free_fs_info.
5067 * The flag should be cleared after reset_balance_state.
5069 need_unlock
= false;
5071 ret
= btrfs_balance(fs_info
, bctl
, bargs
);
5075 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
5084 mutex_unlock(&fs_info
->balance_mutex
);
5086 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
5088 mnt_drop_write_file(file
);
5092 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info
*fs_info
, int cmd
)
5094 if (!capable(CAP_SYS_ADMIN
))
5098 case BTRFS_BALANCE_CTL_PAUSE
:
5099 return btrfs_pause_balance(fs_info
);
5100 case BTRFS_BALANCE_CTL_CANCEL
:
5101 return btrfs_cancel_balance(fs_info
);
5107 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info
*fs_info
,
5110 struct btrfs_ioctl_balance_args
*bargs
;
5113 if (!capable(CAP_SYS_ADMIN
))
5116 mutex_lock(&fs_info
->balance_mutex
);
5117 if (!fs_info
->balance_ctl
) {
5122 bargs
= kzalloc(sizeof(*bargs
), GFP_KERNEL
);
5128 btrfs_update_ioctl_balance_args(fs_info
, bargs
);
5130 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
5135 mutex_unlock(&fs_info
->balance_mutex
);
5139 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
5141 struct inode
*inode
= file_inode(file
);
5142 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5143 struct btrfs_ioctl_quota_ctl_args
*sa
;
5146 if (!capable(CAP_SYS_ADMIN
))
5149 ret
= mnt_want_write_file(file
);
5153 sa
= memdup_user(arg
, sizeof(*sa
));
5159 down_write(&fs_info
->subvol_sem
);
5162 case BTRFS_QUOTA_CTL_ENABLE
:
5163 ret
= btrfs_quota_enable(fs_info
);
5165 case BTRFS_QUOTA_CTL_DISABLE
:
5166 ret
= btrfs_quota_disable(fs_info
);
5174 up_write(&fs_info
->subvol_sem
);
5176 mnt_drop_write_file(file
);
5180 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
5182 struct inode
*inode
= file_inode(file
);
5183 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5184 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5185 struct btrfs_ioctl_qgroup_assign_args
*sa
;
5186 struct btrfs_trans_handle
*trans
;
5190 if (!capable(CAP_SYS_ADMIN
))
5193 ret
= mnt_want_write_file(file
);
5197 sa
= memdup_user(arg
, sizeof(*sa
));
5203 trans
= btrfs_join_transaction(root
);
5204 if (IS_ERR(trans
)) {
5205 ret
= PTR_ERR(trans
);
5210 ret
= btrfs_add_qgroup_relation(trans
, sa
->src
, sa
->dst
);
5212 ret
= btrfs_del_qgroup_relation(trans
, sa
->src
, sa
->dst
);
5215 /* update qgroup status and info */
5216 err
= btrfs_run_qgroups(trans
);
5218 btrfs_handle_fs_error(fs_info
, err
,
5219 "failed to update qgroup status and info");
5220 err
= btrfs_end_transaction(trans
);
5227 mnt_drop_write_file(file
);
5231 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
5233 struct inode
*inode
= file_inode(file
);
5234 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5235 struct btrfs_ioctl_qgroup_create_args
*sa
;
5236 struct btrfs_trans_handle
*trans
;
5240 if (!capable(CAP_SYS_ADMIN
))
5243 ret
= mnt_want_write_file(file
);
5247 sa
= memdup_user(arg
, sizeof(*sa
));
5253 if (!sa
->qgroupid
) {
5258 trans
= btrfs_join_transaction(root
);
5259 if (IS_ERR(trans
)) {
5260 ret
= PTR_ERR(trans
);
5265 ret
= btrfs_create_qgroup(trans
, sa
->qgroupid
);
5267 ret
= btrfs_remove_qgroup(trans
, sa
->qgroupid
);
5270 err
= btrfs_end_transaction(trans
);
5277 mnt_drop_write_file(file
);
5281 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
5283 struct inode
*inode
= file_inode(file
);
5284 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5285 struct btrfs_ioctl_qgroup_limit_args
*sa
;
5286 struct btrfs_trans_handle
*trans
;
5291 if (!capable(CAP_SYS_ADMIN
))
5294 ret
= mnt_want_write_file(file
);
5298 sa
= memdup_user(arg
, sizeof(*sa
));
5304 trans
= btrfs_join_transaction(root
);
5305 if (IS_ERR(trans
)) {
5306 ret
= PTR_ERR(trans
);
5310 qgroupid
= sa
->qgroupid
;
5312 /* take the current subvol as qgroup */
5313 qgroupid
= root
->root_key
.objectid
;
5316 ret
= btrfs_limit_qgroup(trans
, qgroupid
, &sa
->lim
);
5318 err
= btrfs_end_transaction(trans
);
5325 mnt_drop_write_file(file
);
5329 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
5331 struct inode
*inode
= file_inode(file
);
5332 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5333 struct btrfs_ioctl_quota_rescan_args
*qsa
;
5336 if (!capable(CAP_SYS_ADMIN
))
5339 ret
= mnt_want_write_file(file
);
5343 qsa
= memdup_user(arg
, sizeof(*qsa
));
5354 ret
= btrfs_qgroup_rescan(fs_info
);
5359 mnt_drop_write_file(file
);
5363 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
5365 struct inode
*inode
= file_inode(file
);
5366 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5367 struct btrfs_ioctl_quota_rescan_args
*qsa
;
5370 if (!capable(CAP_SYS_ADMIN
))
5373 qsa
= kzalloc(sizeof(*qsa
), GFP_KERNEL
);
5377 if (fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
5379 qsa
->progress
= fs_info
->qgroup_rescan_progress
.objectid
;
5382 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
5389 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
5391 struct inode
*inode
= file_inode(file
);
5392 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5394 if (!capable(CAP_SYS_ADMIN
))
5397 return btrfs_qgroup_wait_for_completion(fs_info
, true);
5400 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
5401 struct btrfs_ioctl_received_subvol_args
*sa
)
5403 struct inode
*inode
= file_inode(file
);
5404 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5405 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5406 struct btrfs_root_item
*root_item
= &root
->root_item
;
5407 struct btrfs_trans_handle
*trans
;
5408 struct timespec64 ct
= current_time(inode
);
5410 int received_uuid_changed
;
5412 if (!inode_owner_or_capable(inode
))
5415 ret
= mnt_want_write_file(file
);
5419 down_write(&fs_info
->subvol_sem
);
5421 if (btrfs_ino(BTRFS_I(inode
)) != BTRFS_FIRST_FREE_OBJECTID
) {
5426 if (btrfs_root_readonly(root
)) {
5433 * 2 - uuid items (received uuid + subvol uuid)
5435 trans
= btrfs_start_transaction(root
, 3);
5436 if (IS_ERR(trans
)) {
5437 ret
= PTR_ERR(trans
);
5442 sa
->rtransid
= trans
->transid
;
5443 sa
->rtime
.sec
= ct
.tv_sec
;
5444 sa
->rtime
.nsec
= ct
.tv_nsec
;
5446 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
5448 if (received_uuid_changed
&&
5449 !btrfs_is_empty_uuid(root_item
->received_uuid
)) {
5450 ret
= btrfs_uuid_tree_remove(trans
, root_item
->received_uuid
,
5451 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
5452 root
->root_key
.objectid
);
5453 if (ret
&& ret
!= -ENOENT
) {
5454 btrfs_abort_transaction(trans
, ret
);
5455 btrfs_end_transaction(trans
);
5459 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
5460 btrfs_set_root_stransid(root_item
, sa
->stransid
);
5461 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
5462 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
5463 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
5464 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
5465 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
5467 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
5468 &root
->root_key
, &root
->root_item
);
5470 btrfs_end_transaction(trans
);
5473 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
5474 ret
= btrfs_uuid_tree_add(trans
, sa
->uuid
,
5475 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
5476 root
->root_key
.objectid
);
5477 if (ret
< 0 && ret
!= -EEXIST
) {
5478 btrfs_abort_transaction(trans
, ret
);
5479 btrfs_end_transaction(trans
);
5483 ret
= btrfs_commit_transaction(trans
);
5485 up_write(&fs_info
->subvol_sem
);
5486 mnt_drop_write_file(file
);
5491 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
5494 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
5495 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
5498 args32
= memdup_user(arg
, sizeof(*args32
));
5500 return PTR_ERR(args32
);
5502 args64
= kmalloc(sizeof(*args64
), GFP_KERNEL
);
5508 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
5509 args64
->stransid
= args32
->stransid
;
5510 args64
->rtransid
= args32
->rtransid
;
5511 args64
->stime
.sec
= args32
->stime
.sec
;
5512 args64
->stime
.nsec
= args32
->stime
.nsec
;
5513 args64
->rtime
.sec
= args32
->rtime
.sec
;
5514 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
5515 args64
->flags
= args32
->flags
;
5517 ret
= _btrfs_ioctl_set_received_subvol(file
, args64
);
5521 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
5522 args32
->stransid
= args64
->stransid
;
5523 args32
->rtransid
= args64
->rtransid
;
5524 args32
->stime
.sec
= args64
->stime
.sec
;
5525 args32
->stime
.nsec
= args64
->stime
.nsec
;
5526 args32
->rtime
.sec
= args64
->rtime
.sec
;
5527 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
5528 args32
->flags
= args64
->flags
;
5530 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
5541 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
5544 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
5547 sa
= memdup_user(arg
, sizeof(*sa
));
5551 ret
= _btrfs_ioctl_set_received_subvol(file
, sa
);
5556 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
5565 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
5567 struct inode
*inode
= file_inode(file
);
5568 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5571 char label
[BTRFS_LABEL_SIZE
];
5573 spin_lock(&fs_info
->super_lock
);
5574 memcpy(label
, fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
5575 spin_unlock(&fs_info
->super_lock
);
5577 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
5579 if (len
== BTRFS_LABEL_SIZE
) {
5581 "label is too long, return the first %zu bytes",
5585 ret
= copy_to_user(arg
, label
, len
);
5587 return ret
? -EFAULT
: 0;
5590 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
5592 struct inode
*inode
= file_inode(file
);
5593 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5594 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5595 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
5596 struct btrfs_trans_handle
*trans
;
5597 char label
[BTRFS_LABEL_SIZE
];
5600 if (!capable(CAP_SYS_ADMIN
))
5603 if (copy_from_user(label
, arg
, sizeof(label
)))
5606 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
5608 "unable to set label with more than %d bytes",
5609 BTRFS_LABEL_SIZE
- 1);
5613 ret
= mnt_want_write_file(file
);
5617 trans
= btrfs_start_transaction(root
, 0);
5618 if (IS_ERR(trans
)) {
5619 ret
= PTR_ERR(trans
);
5623 spin_lock(&fs_info
->super_lock
);
5624 strcpy(super_block
->label
, label
);
5625 spin_unlock(&fs_info
->super_lock
);
5626 ret
= btrfs_commit_transaction(trans
);
5629 mnt_drop_write_file(file
);
5633 #define INIT_FEATURE_FLAGS(suffix) \
5634 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5635 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5636 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5638 int btrfs_ioctl_get_supported_features(void __user
*arg
)
5640 static const struct btrfs_ioctl_feature_flags features
[3] = {
5641 INIT_FEATURE_FLAGS(SUPP
),
5642 INIT_FEATURE_FLAGS(SAFE_SET
),
5643 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
5646 if (copy_to_user(arg
, &features
, sizeof(features
)))
5652 static int btrfs_ioctl_get_features(struct file
*file
, void __user
*arg
)
5654 struct inode
*inode
= file_inode(file
);
5655 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5656 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
5657 struct btrfs_ioctl_feature_flags features
;
5659 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
5660 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
5661 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
5663 if (copy_to_user(arg
, &features
, sizeof(features
)))
5669 static int check_feature_bits(struct btrfs_fs_info
*fs_info
,
5670 enum btrfs_feature_set set
,
5671 u64 change_mask
, u64 flags
, u64 supported_flags
,
5672 u64 safe_set
, u64 safe_clear
)
5674 const char *type
= btrfs_feature_set_names
[set
];
5676 u64 disallowed
, unsupported
;
5677 u64 set_mask
= flags
& change_mask
;
5678 u64 clear_mask
= ~flags
& change_mask
;
5680 unsupported
= set_mask
& ~supported_flags
;
5682 names
= btrfs_printable_features(set
, unsupported
);
5685 "this kernel does not support the %s feature bit%s",
5686 names
, strchr(names
, ',') ? "s" : "");
5690 "this kernel does not support %s bits 0x%llx",
5695 disallowed
= set_mask
& ~safe_set
;
5697 names
= btrfs_printable_features(set
, disallowed
);
5700 "can't set the %s feature bit%s while mounted",
5701 names
, strchr(names
, ',') ? "s" : "");
5705 "can't set %s bits 0x%llx while mounted",
5710 disallowed
= clear_mask
& ~safe_clear
;
5712 names
= btrfs_printable_features(set
, disallowed
);
5715 "can't clear the %s feature bit%s while mounted",
5716 names
, strchr(names
, ',') ? "s" : "");
5720 "can't clear %s bits 0x%llx while mounted",
5728 #define check_feature(fs_info, change_mask, flags, mask_base) \
5729 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5730 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5731 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5732 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5734 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
5736 struct inode
*inode
= file_inode(file
);
5737 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5738 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5739 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
5740 struct btrfs_ioctl_feature_flags flags
[2];
5741 struct btrfs_trans_handle
*trans
;
5745 if (!capable(CAP_SYS_ADMIN
))
5748 if (copy_from_user(flags
, arg
, sizeof(flags
)))
5752 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
5753 !flags
[0].incompat_flags
)
5756 ret
= check_feature(fs_info
, flags
[0].compat_flags
,
5757 flags
[1].compat_flags
, COMPAT
);
5761 ret
= check_feature(fs_info
, flags
[0].compat_ro_flags
,
5762 flags
[1].compat_ro_flags
, COMPAT_RO
);
5766 ret
= check_feature(fs_info
, flags
[0].incompat_flags
,
5767 flags
[1].incompat_flags
, INCOMPAT
);
5771 ret
= mnt_want_write_file(file
);
5775 trans
= btrfs_start_transaction(root
, 0);
5776 if (IS_ERR(trans
)) {
5777 ret
= PTR_ERR(trans
);
5778 goto out_drop_write
;
5781 spin_lock(&fs_info
->super_lock
);
5782 newflags
= btrfs_super_compat_flags(super_block
);
5783 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
5784 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
5785 btrfs_set_super_compat_flags(super_block
, newflags
);
5787 newflags
= btrfs_super_compat_ro_flags(super_block
);
5788 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
5789 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
5790 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
5792 newflags
= btrfs_super_incompat_flags(super_block
);
5793 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
5794 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
5795 btrfs_set_super_incompat_flags(super_block
, newflags
);
5796 spin_unlock(&fs_info
->super_lock
);
5798 ret
= btrfs_commit_transaction(trans
);
5800 mnt_drop_write_file(file
);
5805 static int _btrfs_ioctl_send(struct file
*file
, void __user
*argp
, bool compat
)
5807 struct btrfs_ioctl_send_args
*arg
;
5811 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5812 struct btrfs_ioctl_send_args_32 args32
;
5814 ret
= copy_from_user(&args32
, argp
, sizeof(args32
));
5817 arg
= kzalloc(sizeof(*arg
), GFP_KERNEL
);
5820 arg
->send_fd
= args32
.send_fd
;
5821 arg
->clone_sources_count
= args32
.clone_sources_count
;
5822 arg
->clone_sources
= compat_ptr(args32
.clone_sources
);
5823 arg
->parent_root
= args32
.parent_root
;
5824 arg
->flags
= args32
.flags
;
5825 memcpy(arg
->reserved
, args32
.reserved
,
5826 sizeof(args32
.reserved
));
5831 arg
= memdup_user(argp
, sizeof(*arg
));
5833 return PTR_ERR(arg
);
5835 ret
= btrfs_ioctl_send(file
, arg
);
5840 long btrfs_ioctl(struct file
*file
, unsigned int
5841 cmd
, unsigned long arg
)
5843 struct inode
*inode
= file_inode(file
);
5844 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5845 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5846 void __user
*argp
= (void __user
*)arg
;
5849 case FS_IOC_GETFLAGS
:
5850 return btrfs_ioctl_getflags(file
, argp
);
5851 case FS_IOC_SETFLAGS
:
5852 return btrfs_ioctl_setflags(file
, argp
);
5853 case FS_IOC_GETVERSION
:
5854 return btrfs_ioctl_getversion(file
, argp
);
5856 return btrfs_ioctl_fitrim(file
, argp
);
5857 case BTRFS_IOC_SNAP_CREATE
:
5858 return btrfs_ioctl_snap_create(file
, argp
, 0);
5859 case BTRFS_IOC_SNAP_CREATE_V2
:
5860 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
5861 case BTRFS_IOC_SUBVOL_CREATE
:
5862 return btrfs_ioctl_snap_create(file
, argp
, 1);
5863 case BTRFS_IOC_SUBVOL_CREATE_V2
:
5864 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
5865 case BTRFS_IOC_SNAP_DESTROY
:
5866 return btrfs_ioctl_snap_destroy(file
, argp
);
5867 case BTRFS_IOC_SUBVOL_GETFLAGS
:
5868 return btrfs_ioctl_subvol_getflags(file
, argp
);
5869 case BTRFS_IOC_SUBVOL_SETFLAGS
:
5870 return btrfs_ioctl_subvol_setflags(file
, argp
);
5871 case BTRFS_IOC_DEFAULT_SUBVOL
:
5872 return btrfs_ioctl_default_subvol(file
, argp
);
5873 case BTRFS_IOC_DEFRAG
:
5874 return btrfs_ioctl_defrag(file
, NULL
);
5875 case BTRFS_IOC_DEFRAG_RANGE
:
5876 return btrfs_ioctl_defrag(file
, argp
);
5877 case BTRFS_IOC_RESIZE
:
5878 return btrfs_ioctl_resize(file
, argp
);
5879 case BTRFS_IOC_ADD_DEV
:
5880 return btrfs_ioctl_add_dev(fs_info
, argp
);
5881 case BTRFS_IOC_RM_DEV
:
5882 return btrfs_ioctl_rm_dev(file
, argp
);
5883 case BTRFS_IOC_RM_DEV_V2
:
5884 return btrfs_ioctl_rm_dev_v2(file
, argp
);
5885 case BTRFS_IOC_FS_INFO
:
5886 return btrfs_ioctl_fs_info(fs_info
, argp
);
5887 case BTRFS_IOC_DEV_INFO
:
5888 return btrfs_ioctl_dev_info(fs_info
, argp
);
5889 case BTRFS_IOC_BALANCE
:
5890 return btrfs_ioctl_balance(file
, NULL
);
5891 case BTRFS_IOC_TREE_SEARCH
:
5892 return btrfs_ioctl_tree_search(file
, argp
);
5893 case BTRFS_IOC_TREE_SEARCH_V2
:
5894 return btrfs_ioctl_tree_search_v2(file
, argp
);
5895 case BTRFS_IOC_INO_LOOKUP
:
5896 return btrfs_ioctl_ino_lookup(file
, argp
);
5897 case BTRFS_IOC_INO_PATHS
:
5898 return btrfs_ioctl_ino_to_path(root
, argp
);
5899 case BTRFS_IOC_LOGICAL_INO
:
5900 return btrfs_ioctl_logical_to_ino(fs_info
, argp
, 1);
5901 case BTRFS_IOC_LOGICAL_INO_V2
:
5902 return btrfs_ioctl_logical_to_ino(fs_info
, argp
, 2);
5903 case BTRFS_IOC_SPACE_INFO
:
5904 return btrfs_ioctl_space_info(fs_info
, argp
);
5905 case BTRFS_IOC_SYNC
: {
5908 ret
= btrfs_start_delalloc_roots(fs_info
, -1);
5911 ret
= btrfs_sync_fs(inode
->i_sb
, 1);
5913 * The transaction thread may want to do more work,
5914 * namely it pokes the cleaner kthread that will start
5915 * processing uncleaned subvols.
5917 wake_up_process(fs_info
->transaction_kthread
);
5920 case BTRFS_IOC_START_SYNC
:
5921 return btrfs_ioctl_start_sync(root
, argp
);
5922 case BTRFS_IOC_WAIT_SYNC
:
5923 return btrfs_ioctl_wait_sync(fs_info
, argp
);
5924 case BTRFS_IOC_SCRUB
:
5925 return btrfs_ioctl_scrub(file
, argp
);
5926 case BTRFS_IOC_SCRUB_CANCEL
:
5927 return btrfs_ioctl_scrub_cancel(fs_info
);
5928 case BTRFS_IOC_SCRUB_PROGRESS
:
5929 return btrfs_ioctl_scrub_progress(fs_info
, argp
);
5930 case BTRFS_IOC_BALANCE_V2
:
5931 return btrfs_ioctl_balance(file
, argp
);
5932 case BTRFS_IOC_BALANCE_CTL
:
5933 return btrfs_ioctl_balance_ctl(fs_info
, arg
);
5934 case BTRFS_IOC_BALANCE_PROGRESS
:
5935 return btrfs_ioctl_balance_progress(fs_info
, argp
);
5936 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
5937 return btrfs_ioctl_set_received_subvol(file
, argp
);
5939 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
5940 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
5942 case BTRFS_IOC_SEND
:
5943 return _btrfs_ioctl_send(file
, argp
, false);
5944 #if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
5945 case BTRFS_IOC_SEND_32
:
5946 return _btrfs_ioctl_send(file
, argp
, true);
5948 case BTRFS_IOC_GET_DEV_STATS
:
5949 return btrfs_ioctl_get_dev_stats(fs_info
, argp
);
5950 case BTRFS_IOC_QUOTA_CTL
:
5951 return btrfs_ioctl_quota_ctl(file
, argp
);
5952 case BTRFS_IOC_QGROUP_ASSIGN
:
5953 return btrfs_ioctl_qgroup_assign(file
, argp
);
5954 case BTRFS_IOC_QGROUP_CREATE
:
5955 return btrfs_ioctl_qgroup_create(file
, argp
);
5956 case BTRFS_IOC_QGROUP_LIMIT
:
5957 return btrfs_ioctl_qgroup_limit(file
, argp
);
5958 case BTRFS_IOC_QUOTA_RESCAN
:
5959 return btrfs_ioctl_quota_rescan(file
, argp
);
5960 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
5961 return btrfs_ioctl_quota_rescan_status(file
, argp
);
5962 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
5963 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
5964 case BTRFS_IOC_DEV_REPLACE
:
5965 return btrfs_ioctl_dev_replace(fs_info
, argp
);
5966 case BTRFS_IOC_GET_FSLABEL
:
5967 return btrfs_ioctl_get_fslabel(file
, argp
);
5968 case BTRFS_IOC_SET_FSLABEL
:
5969 return btrfs_ioctl_set_fslabel(file
, argp
);
5970 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
5971 return btrfs_ioctl_get_supported_features(argp
);
5972 case BTRFS_IOC_GET_FEATURES
:
5973 return btrfs_ioctl_get_features(file
, argp
);
5974 case BTRFS_IOC_SET_FEATURES
:
5975 return btrfs_ioctl_set_features(file
, argp
);
5976 case FS_IOC_FSGETXATTR
:
5977 return btrfs_ioctl_fsgetxattr(file
, argp
);
5978 case FS_IOC_FSSETXATTR
:
5979 return btrfs_ioctl_fssetxattr(file
, argp
);
5980 case BTRFS_IOC_GET_SUBVOL_INFO
:
5981 return btrfs_ioctl_get_subvol_info(file
, argp
);
5982 case BTRFS_IOC_GET_SUBVOL_ROOTREF
:
5983 return btrfs_ioctl_get_subvol_rootref(file
, argp
);
5984 case BTRFS_IOC_INO_LOOKUP_USER
:
5985 return btrfs_ioctl_ino_lookup_user(file
, argp
);
5991 #ifdef CONFIG_COMPAT
5992 long btrfs_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
5995 * These all access 32-bit values anyway so no further
5996 * handling is necessary.
5999 case FS_IOC32_GETFLAGS
:
6000 cmd
= FS_IOC_GETFLAGS
;
6002 case FS_IOC32_SETFLAGS
:
6003 cmd
= FS_IOC_SETFLAGS
;
6005 case FS_IOC32_GETVERSION
:
6006 cmd
= FS_IOC_GETVERSION
;
6010 return btrfs_ioctl(file
, cmd
, (unsigned long) compat_ptr(arg
));