2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/fsnotify.h>
25 #include <linux/pagemap.h>
26 #include <linux/highmem.h>
27 #include <linux/time.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/backing-dev.h>
31 #include <linux/mount.h>
32 #include <linux/mpage.h>
33 #include <linux/namei.h>
34 #include <linux/swap.h>
35 #include <linux/writeback.h>
36 #include <linux/statfs.h>
37 #include <linux/compat.h>
38 #include <linux/bit_spinlock.h>
39 #include <linux/security.h>
40 #include <linux/xattr.h>
41 #include <linux/vmalloc.h>
42 #include <linux/slab.h>
43 #include <linux/blkdev.h>
44 #include <linux/uuid.h>
45 #include <linux/btrfs.h>
46 #include <linux/uaccess.h>
49 #include "transaction.h"
50 #include "btrfs_inode.h"
51 #include "print-tree.h"
54 #include "inode-map.h"
56 #include "rcu-string.h"
58 #include "dev-replace.h"
64 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
65 * structures are incorrect, as the timespec structure from userspace
66 * is 4 bytes too small. We define these alternatives here to teach
67 * the kernel about the 32-bit struct packing.
69 struct btrfs_ioctl_timespec_32
{
72 } __attribute__ ((__packed__
));
74 struct btrfs_ioctl_received_subvol_args_32
{
75 char uuid
[BTRFS_UUID_SIZE
]; /* in */
76 __u64 stransid
; /* in */
77 __u64 rtransid
; /* out */
78 struct btrfs_ioctl_timespec_32 stime
; /* in */
79 struct btrfs_ioctl_timespec_32 rtime
; /* out */
81 __u64 reserved
[16]; /* in */
82 } __attribute__ ((__packed__
));
84 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
85 struct btrfs_ioctl_received_subvol_args_32)
89 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
90 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
);
92 /* Mask out flags that are inappropriate for the given type of inode. */
93 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
97 else if (S_ISREG(mode
))
98 return flags
& ~FS_DIRSYNC_FL
;
100 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
104 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
106 static unsigned int btrfs_flags_to_ioctl(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_COMPRESS
) && !(flags
& BTRFS_INODE_NOCOMPRESS
))
126 iflags
|= FS_COMPR_FL
;
127 else if (flags
& BTRFS_INODE_NOCOMPRESS
)
128 iflags
|= FS_NOCOMP_FL
;
134 * Update inode->i_flags based on the btrfs internal flags.
136 void btrfs_update_iflags(struct inode
*inode
)
138 struct btrfs_inode
*ip
= BTRFS_I(inode
);
139 unsigned int new_fl
= 0;
141 if (ip
->flags
& BTRFS_INODE_SYNC
)
143 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
144 new_fl
|= S_IMMUTABLE
;
145 if (ip
->flags
& BTRFS_INODE_APPEND
)
147 if (ip
->flags
& BTRFS_INODE_NOATIME
)
149 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
152 set_mask_bits(&inode
->i_flags
,
153 S_SYNC
| S_APPEND
| S_IMMUTABLE
| S_NOATIME
| S_DIRSYNC
,
158 * Inherit flags from the parent inode.
160 * Currently only the compression flags and the cow flags are inherited.
162 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
169 flags
= BTRFS_I(dir
)->flags
;
171 if (flags
& BTRFS_INODE_NOCOMPRESS
) {
172 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_COMPRESS
;
173 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
174 } else if (flags
& BTRFS_INODE_COMPRESS
) {
175 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
176 BTRFS_I(inode
)->flags
|= BTRFS_INODE_COMPRESS
;
179 if (flags
& BTRFS_INODE_NODATACOW
) {
180 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
;
181 if (S_ISREG(inode
->i_mode
))
182 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
185 btrfs_update_iflags(inode
);
188 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
190 struct btrfs_inode
*ip
= BTRFS_I(file_inode(file
));
191 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
193 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
198 static int check_flags(unsigned int flags
)
200 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
201 FS_NOATIME_FL
| FS_NODUMP_FL
| \
202 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
203 FS_NOCOMP_FL
| FS_COMPR_FL
|
207 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
213 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
215 struct inode
*inode
= file_inode(file
);
216 struct btrfs_inode
*ip
= BTRFS_I(inode
);
217 struct btrfs_root
*root
= ip
->root
;
218 struct btrfs_trans_handle
*trans
;
219 unsigned int flags
, oldflags
;
222 unsigned int i_oldflags
;
225 if (!inode_owner_or_capable(inode
))
228 if (btrfs_root_readonly(root
))
231 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
234 ret
= check_flags(flags
);
238 ret
= mnt_want_write_file(file
);
242 mutex_lock(&inode
->i_mutex
);
244 ip_oldflags
= ip
->flags
;
245 i_oldflags
= inode
->i_flags
;
246 mode
= inode
->i_mode
;
248 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
249 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
250 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
251 if (!capable(CAP_LINUX_IMMUTABLE
)) {
257 if (flags
& FS_SYNC_FL
)
258 ip
->flags
|= BTRFS_INODE_SYNC
;
260 ip
->flags
&= ~BTRFS_INODE_SYNC
;
261 if (flags
& FS_IMMUTABLE_FL
)
262 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
264 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
265 if (flags
& FS_APPEND_FL
)
266 ip
->flags
|= BTRFS_INODE_APPEND
;
268 ip
->flags
&= ~BTRFS_INODE_APPEND
;
269 if (flags
& FS_NODUMP_FL
)
270 ip
->flags
|= BTRFS_INODE_NODUMP
;
272 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
273 if (flags
& FS_NOATIME_FL
)
274 ip
->flags
|= BTRFS_INODE_NOATIME
;
276 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
277 if (flags
& FS_DIRSYNC_FL
)
278 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
280 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
281 if (flags
& FS_NOCOW_FL
) {
284 * It's safe to turn csums off here, no extents exist.
285 * Otherwise we want the flag to reflect the real COW
286 * status of the file and will not set it.
288 if (inode
->i_size
== 0)
289 ip
->flags
|= BTRFS_INODE_NODATACOW
290 | BTRFS_INODE_NODATASUM
;
292 ip
->flags
|= BTRFS_INODE_NODATACOW
;
296 * Revert back under same assuptions as above
299 if (inode
->i_size
== 0)
300 ip
->flags
&= ~(BTRFS_INODE_NODATACOW
301 | BTRFS_INODE_NODATASUM
);
303 ip
->flags
&= ~BTRFS_INODE_NODATACOW
;
308 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
309 * flag may be changed automatically if compression code won't make
312 if (flags
& FS_NOCOMP_FL
) {
313 ip
->flags
&= ~BTRFS_INODE_COMPRESS
;
314 ip
->flags
|= BTRFS_INODE_NOCOMPRESS
;
316 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
317 if (ret
&& ret
!= -ENODATA
)
319 } else if (flags
& FS_COMPR_FL
) {
322 ip
->flags
|= BTRFS_INODE_COMPRESS
;
323 ip
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
325 if (root
->fs_info
->compress_type
== BTRFS_COMPRESS_LZO
)
329 ret
= btrfs_set_prop(inode
, "btrfs.compression",
330 comp
, strlen(comp
), 0);
335 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
336 if (ret
&& ret
!= -ENODATA
)
338 ip
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
341 trans
= btrfs_start_transaction(root
, 1);
343 ret
= PTR_ERR(trans
);
347 btrfs_update_iflags(inode
);
348 inode_inc_iversion(inode
);
349 inode
->i_ctime
= CURRENT_TIME
;
350 ret
= btrfs_update_inode(trans
, root
, inode
);
352 btrfs_end_transaction(trans
, root
);
355 ip
->flags
= ip_oldflags
;
356 inode
->i_flags
= i_oldflags
;
360 mutex_unlock(&inode
->i_mutex
);
361 mnt_drop_write_file(file
);
365 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
367 struct inode
*inode
= file_inode(file
);
369 return put_user(inode
->i_generation
, arg
);
372 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
374 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
375 struct btrfs_device
*device
;
376 struct request_queue
*q
;
377 struct fstrim_range range
;
378 u64 minlen
= ULLONG_MAX
;
380 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
383 if (!capable(CAP_SYS_ADMIN
))
387 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
391 q
= bdev_get_queue(device
->bdev
);
392 if (blk_queue_discard(q
)) {
394 minlen
= min((u64
)q
->limits
.discard_granularity
,
402 if (copy_from_user(&range
, arg
, sizeof(range
)))
404 if (range
.start
> total_bytes
||
405 range
.len
< fs_info
->sb
->s_blocksize
)
408 range
.len
= min(range
.len
, total_bytes
- range
.start
);
409 range
.minlen
= max(range
.minlen
, minlen
);
410 ret
= btrfs_trim_fs(fs_info
->tree_root
, &range
);
414 if (copy_to_user(arg
, &range
, sizeof(range
)))
420 int btrfs_is_empty_uuid(u8
*uuid
)
424 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
431 static noinline
int create_subvol(struct inode
*dir
,
432 struct dentry
*dentry
,
433 char *name
, int namelen
,
435 struct btrfs_qgroup_inherit
*inherit
)
437 struct btrfs_trans_handle
*trans
;
438 struct btrfs_key key
;
439 struct btrfs_root_item root_item
;
440 struct btrfs_inode_item
*inode_item
;
441 struct extent_buffer
*leaf
;
442 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
443 struct btrfs_root
*new_root
;
444 struct btrfs_block_rsv block_rsv
;
445 struct timespec cur_time
= CURRENT_TIME
;
450 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
455 ret
= btrfs_find_free_objectid(root
->fs_info
->tree_root
, &objectid
);
459 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
461 * The same as the snapshot creation, please see the comment
462 * of create_snapshot().
464 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
465 8, &qgroup_reserved
, false);
469 trans
= btrfs_start_transaction(root
, 0);
471 ret
= PTR_ERR(trans
);
472 btrfs_subvolume_release_metadata(root
, &block_rsv
,
476 trans
->block_rsv
= &block_rsv
;
477 trans
->bytes_reserved
= block_rsv
.size
;
479 ret
= btrfs_qgroup_inherit(trans
, root
->fs_info
, 0, objectid
, inherit
);
483 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
489 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
490 btrfs_set_header_bytenr(leaf
, leaf
->start
);
491 btrfs_set_header_generation(leaf
, trans
->transid
);
492 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
493 btrfs_set_header_owner(leaf
, objectid
);
495 write_extent_buffer(leaf
, root
->fs_info
->fsid
, btrfs_header_fsid(),
497 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
498 btrfs_header_chunk_tree_uuid(leaf
),
500 btrfs_mark_buffer_dirty(leaf
);
502 memset(&root_item
, 0, sizeof(root_item
));
504 inode_item
= &root_item
.inode
;
505 btrfs_set_stack_inode_generation(inode_item
, 1);
506 btrfs_set_stack_inode_size(inode_item
, 3);
507 btrfs_set_stack_inode_nlink(inode_item
, 1);
508 btrfs_set_stack_inode_nbytes(inode_item
, root
->nodesize
);
509 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
511 btrfs_set_root_flags(&root_item
, 0);
512 btrfs_set_root_limit(&root_item
, 0);
513 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
515 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
516 btrfs_set_root_generation(&root_item
, trans
->transid
);
517 btrfs_set_root_level(&root_item
, 0);
518 btrfs_set_root_refs(&root_item
, 1);
519 btrfs_set_root_used(&root_item
, leaf
->len
);
520 btrfs_set_root_last_snapshot(&root_item
, 0);
522 btrfs_set_root_generation_v2(&root_item
,
523 btrfs_root_generation(&root_item
));
524 uuid_le_gen(&new_uuid
);
525 memcpy(root_item
.uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
526 btrfs_set_stack_timespec_sec(&root_item
.otime
, cur_time
.tv_sec
);
527 btrfs_set_stack_timespec_nsec(&root_item
.otime
, cur_time
.tv_nsec
);
528 root_item
.ctime
= root_item
.otime
;
529 btrfs_set_root_ctransid(&root_item
, trans
->transid
);
530 btrfs_set_root_otransid(&root_item
, trans
->transid
);
532 btrfs_tree_unlock(leaf
);
533 free_extent_buffer(leaf
);
536 btrfs_set_root_dirid(&root_item
, new_dirid
);
538 key
.objectid
= objectid
;
540 key
.type
= BTRFS_ROOT_ITEM_KEY
;
541 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
546 key
.offset
= (u64
)-1;
547 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
548 if (IS_ERR(new_root
)) {
549 btrfs_abort_transaction(trans
, root
, PTR_ERR(new_root
));
550 ret
= PTR_ERR(new_root
);
554 btrfs_record_root_in_trans(trans
, new_root
);
556 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, new_dirid
);
558 /* We potentially lose an unused inode item here */
559 btrfs_abort_transaction(trans
, root
, ret
);
564 * insert the directory item
566 ret
= btrfs_set_inode_index(dir
, &index
);
568 btrfs_abort_transaction(trans
, root
, ret
);
572 ret
= btrfs_insert_dir_item(trans
, root
,
573 name
, namelen
, dir
, &key
,
574 BTRFS_FT_DIR
, index
);
576 btrfs_abort_transaction(trans
, root
, ret
);
580 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
581 ret
= btrfs_update_inode(trans
, root
, dir
);
584 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
585 objectid
, root
->root_key
.objectid
,
586 btrfs_ino(dir
), index
, name
, namelen
);
589 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
590 root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
593 btrfs_abort_transaction(trans
, root
, ret
);
596 trans
->block_rsv
= NULL
;
597 trans
->bytes_reserved
= 0;
598 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
601 *async_transid
= trans
->transid
;
602 err
= btrfs_commit_transaction_async(trans
, root
, 1);
604 err
= btrfs_commit_transaction(trans
, root
);
606 err
= btrfs_commit_transaction(trans
, root
);
612 inode
= btrfs_lookup_dentry(dir
, dentry
);
614 return PTR_ERR(inode
);
615 d_instantiate(dentry
, inode
);
620 static void btrfs_wait_nocow_write(struct btrfs_root
*root
)
626 prepare_to_wait(&root
->subv_writers
->wait
, &wait
,
627 TASK_UNINTERRUPTIBLE
);
629 writers
= percpu_counter_sum(&root
->subv_writers
->counter
);
633 finish_wait(&root
->subv_writers
->wait
, &wait
);
637 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
638 struct dentry
*dentry
, char *name
, int namelen
,
639 u64
*async_transid
, bool readonly
,
640 struct btrfs_qgroup_inherit
*inherit
)
643 struct btrfs_pending_snapshot
*pending_snapshot
;
644 struct btrfs_trans_handle
*trans
;
647 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
650 atomic_inc(&root
->will_be_snapshoted
);
651 smp_mb__after_atomic();
652 btrfs_wait_nocow_write(root
);
654 ret
= btrfs_start_delalloc_inodes(root
, 0);
658 btrfs_wait_ordered_extents(root
, -1);
660 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
661 if (!pending_snapshot
) {
666 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
667 BTRFS_BLOCK_RSV_TEMP
);
669 * 1 - parent dir inode
672 * 2 - root ref/backref
673 * 1 - root of snapshot
676 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
677 &pending_snapshot
->block_rsv
, 8,
678 &pending_snapshot
->qgroup_reserved
,
683 pending_snapshot
->dentry
= dentry
;
684 pending_snapshot
->root
= root
;
685 pending_snapshot
->readonly
= readonly
;
686 pending_snapshot
->dir
= dir
;
687 pending_snapshot
->inherit
= inherit
;
689 trans
= btrfs_start_transaction(root
, 0);
691 ret
= PTR_ERR(trans
);
695 spin_lock(&root
->fs_info
->trans_lock
);
696 list_add(&pending_snapshot
->list
,
697 &trans
->transaction
->pending_snapshots
);
698 spin_unlock(&root
->fs_info
->trans_lock
);
700 *async_transid
= trans
->transid
;
701 ret
= btrfs_commit_transaction_async(trans
,
702 root
->fs_info
->extent_root
, 1);
704 ret
= btrfs_commit_transaction(trans
, root
);
706 ret
= btrfs_commit_transaction(trans
,
707 root
->fs_info
->extent_root
);
712 ret
= pending_snapshot
->error
;
716 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
721 * If orphan cleanup did remove any orphans, it means the tree was
722 * modified and therefore the commit root is not the same as the
723 * current root anymore. This is a problem, because send uses the
724 * commit root and therefore can see inode items that don't exist
725 * in the current root anymore, and for example make calls to
726 * btrfs_iget, which will do tree lookups based on the current root
727 * and not on the commit root. Those lookups will fail, returning a
728 * -ESTALE error, and making send fail with that error. So make sure
729 * a send does not see any orphans we have just removed, and that it
730 * will see the same inodes regardless of whether a transaction
731 * commit happened before it started (meaning that the commit root
732 * will be the same as the current root) or not.
734 if (readonly
&& pending_snapshot
->snap
->node
!=
735 pending_snapshot
->snap
->commit_root
) {
736 trans
= btrfs_join_transaction(pending_snapshot
->snap
);
737 if (IS_ERR(trans
) && PTR_ERR(trans
) != -ENOENT
) {
738 ret
= PTR_ERR(trans
);
741 if (!IS_ERR(trans
)) {
742 ret
= btrfs_commit_transaction(trans
,
743 pending_snapshot
->snap
);
749 inode
= btrfs_lookup_dentry(dentry
->d_parent
->d_inode
, dentry
);
751 ret
= PTR_ERR(inode
);
755 d_instantiate(dentry
, inode
);
758 btrfs_subvolume_release_metadata(BTRFS_I(dir
)->root
,
759 &pending_snapshot
->block_rsv
,
760 pending_snapshot
->qgroup_reserved
);
762 kfree(pending_snapshot
);
764 atomic_dec(&root
->will_be_snapshoted
);
768 /* copy of may_delete in fs/namei.c()
769 * Check whether we can remove a link victim from directory dir, check
770 * whether the type of victim is right.
771 * 1. We can't do it if dir is read-only (done in permission())
772 * 2. We should have write and exec permissions on dir
773 * 3. We can't remove anything from append-only dir
774 * 4. We can't do anything with immutable dir (done in permission())
775 * 5. If the sticky bit on dir is set we should either
776 * a. be owner of dir, or
777 * b. be owner of victim, or
778 * c. have CAP_FOWNER capability
779 * 6. If the victim is append-only or immutable we can't do antyhing with
780 * links pointing to it.
781 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
782 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
783 * 9. We can't remove a root or mountpoint.
784 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
785 * nfs_async_unlink().
788 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
792 if (!victim
->d_inode
)
795 BUG_ON(victim
->d_parent
->d_inode
!= dir
);
796 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
798 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
803 if (check_sticky(dir
, victim
->d_inode
) || IS_APPEND(victim
->d_inode
) ||
804 IS_IMMUTABLE(victim
->d_inode
) || IS_SWAPFILE(victim
->d_inode
))
807 if (!S_ISDIR(victim
->d_inode
->i_mode
))
811 } else if (S_ISDIR(victim
->d_inode
->i_mode
))
815 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
820 /* copy of may_create in fs/namei.c() */
821 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
827 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
831 * Create a new subvolume below @parent. This is largely modeled after
832 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
833 * inside this filesystem so it's quite a bit simpler.
835 static noinline
int btrfs_mksubvol(struct path
*parent
,
836 char *name
, int namelen
,
837 struct btrfs_root
*snap_src
,
838 u64
*async_transid
, bool readonly
,
839 struct btrfs_qgroup_inherit
*inherit
)
841 struct inode
*dir
= parent
->dentry
->d_inode
;
842 struct dentry
*dentry
;
845 error
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
849 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
850 error
= PTR_ERR(dentry
);
858 error
= btrfs_may_create(dir
, dentry
);
863 * even if this name doesn't exist, we may get hash collisions.
864 * check for them now when we can safely fail
866 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
872 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
874 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
878 error
= create_snapshot(snap_src
, dir
, dentry
, name
, namelen
,
879 async_transid
, readonly
, inherit
);
881 error
= create_subvol(dir
, dentry
, name
, namelen
,
882 async_transid
, inherit
);
885 fsnotify_mkdir(dir
, dentry
);
887 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
891 mutex_unlock(&dir
->i_mutex
);
896 * When we're defragging a range, we don't want to kick it off again
897 * if it is really just waiting for delalloc to send it down.
898 * If we find a nice big extent or delalloc range for the bytes in the
899 * file you want to defrag, we return 0 to let you know to skip this
902 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
904 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
905 struct extent_map
*em
= NULL
;
906 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
909 read_lock(&em_tree
->lock
);
910 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_CACHE_SIZE
);
911 read_unlock(&em_tree
->lock
);
914 end
= extent_map_end(em
);
916 if (end
- offset
> thresh
)
919 /* if we already have a nice delalloc here, just stop */
921 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
922 thresh
, EXTENT_DELALLOC
, 1);
929 * helper function to walk through a file and find extents
930 * newer than a specific transid, and smaller than thresh.
932 * This is used by the defragging code to find new and small
935 static int find_new_extents(struct btrfs_root
*root
,
936 struct inode
*inode
, u64 newer_than
,
937 u64
*off
, u32 thresh
)
939 struct btrfs_path
*path
;
940 struct btrfs_key min_key
;
941 struct extent_buffer
*leaf
;
942 struct btrfs_file_extent_item
*extent
;
945 u64 ino
= btrfs_ino(inode
);
947 path
= btrfs_alloc_path();
951 min_key
.objectid
= ino
;
952 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
953 min_key
.offset
= *off
;
956 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
960 if (min_key
.objectid
!= ino
)
962 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
965 leaf
= path
->nodes
[0];
966 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
967 struct btrfs_file_extent_item
);
969 type
= btrfs_file_extent_type(leaf
, extent
);
970 if (type
== BTRFS_FILE_EXTENT_REG
&&
971 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
972 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
973 *off
= min_key
.offset
;
974 btrfs_free_path(path
);
979 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
980 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
984 if (min_key
.offset
== (u64
)-1)
988 btrfs_release_path(path
);
991 btrfs_free_path(path
);
995 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
997 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
998 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
999 struct extent_map
*em
;
1000 u64 len
= PAGE_CACHE_SIZE
;
1003 * hopefully we have this extent in the tree already, try without
1004 * the full extent lock
1006 read_lock(&em_tree
->lock
);
1007 em
= lookup_extent_mapping(em_tree
, start
, len
);
1008 read_unlock(&em_tree
->lock
);
1011 struct extent_state
*cached
= NULL
;
1012 u64 end
= start
+ len
- 1;
1014 /* get the big lock and read metadata off disk */
1015 lock_extent_bits(io_tree
, start
, end
, 0, &cached
);
1016 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
1017 unlock_extent_cached(io_tree
, start
, end
, &cached
, GFP_NOFS
);
1026 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1028 struct extent_map
*next
;
1031 /* this is the last extent */
1032 if (em
->start
+ em
->len
>= i_size_read(inode
))
1035 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1036 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1038 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1039 (em
->block_len
> 128 * 1024 && next
->block_len
> 128 * 1024))
1042 free_extent_map(next
);
1046 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1047 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1050 struct extent_map
*em
;
1052 bool next_mergeable
= true;
1055 * make sure that once we start defragging an extent, we keep on
1058 if (start
< *defrag_end
)
1063 em
= defrag_lookup_extent(inode
, start
);
1067 /* this will cover holes, and inline extents */
1068 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1073 next_mergeable
= defrag_check_next_extent(inode
, em
);
1075 * we hit a real extent, if it is big or the next extent is not a
1076 * real extent, don't bother defragging it
1078 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1079 (em
->len
>= thresh
|| !next_mergeable
))
1083 * last_len ends up being a counter of how many bytes we've defragged.
1084 * every time we choose not to defrag an extent, we reset *last_len
1085 * so that the next tiny extent will force a defrag.
1087 * The end result of this is that tiny extents before a single big
1088 * extent will force at least part of that big extent to be defragged.
1091 *defrag_end
= extent_map_end(em
);
1094 *skip
= extent_map_end(em
);
1098 free_extent_map(em
);
1103 * it doesn't do much good to defrag one or two pages
1104 * at a time. This pulls in a nice chunk of pages
1105 * to COW and defrag.
1107 * It also makes sure the delalloc code has enough
1108 * dirty data to avoid making new small extents as part
1111 * It's a good idea to start RA on this range
1112 * before calling this.
1114 static int cluster_pages_for_defrag(struct inode
*inode
,
1115 struct page
**pages
,
1116 unsigned long start_index
,
1117 unsigned long num_pages
)
1119 unsigned long file_end
;
1120 u64 isize
= i_size_read(inode
);
1127 struct btrfs_ordered_extent
*ordered
;
1128 struct extent_state
*cached_state
= NULL
;
1129 struct extent_io_tree
*tree
;
1130 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1132 file_end
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1133 if (!isize
|| start_index
> file_end
)
1136 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1138 ret
= btrfs_delalloc_reserve_space(inode
,
1139 page_cnt
<< PAGE_CACHE_SHIFT
);
1143 tree
= &BTRFS_I(inode
)->io_tree
;
1145 /* step one, lock all the pages */
1146 for (i
= 0; i
< page_cnt
; i
++) {
1149 page
= find_or_create_page(inode
->i_mapping
,
1150 start_index
+ i
, mask
);
1154 page_start
= page_offset(page
);
1155 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1157 lock_extent_bits(tree
, page_start
, page_end
,
1159 ordered
= btrfs_lookup_ordered_extent(inode
,
1161 unlock_extent_cached(tree
, page_start
, page_end
,
1162 &cached_state
, GFP_NOFS
);
1167 btrfs_start_ordered_extent(inode
, ordered
, 1);
1168 btrfs_put_ordered_extent(ordered
);
1171 * we unlocked the page above, so we need check if
1172 * it was released or not.
1174 if (page
->mapping
!= inode
->i_mapping
) {
1176 page_cache_release(page
);
1181 if (!PageUptodate(page
)) {
1182 btrfs_readpage(NULL
, page
);
1184 if (!PageUptodate(page
)) {
1186 page_cache_release(page
);
1192 if (page
->mapping
!= inode
->i_mapping
) {
1194 page_cache_release(page
);
1204 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1208 * so now we have a nice long stream of locked
1209 * and up to date pages, lets wait on them
1211 for (i
= 0; i
< i_done
; i
++)
1212 wait_on_page_writeback(pages
[i
]);
1214 page_start
= page_offset(pages
[0]);
1215 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_CACHE_SIZE
;
1217 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1218 page_start
, page_end
- 1, 0, &cached_state
);
1219 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1220 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1221 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1222 &cached_state
, GFP_NOFS
);
1224 if (i_done
!= page_cnt
) {
1225 spin_lock(&BTRFS_I(inode
)->lock
);
1226 BTRFS_I(inode
)->outstanding_extents
++;
1227 spin_unlock(&BTRFS_I(inode
)->lock
);
1228 btrfs_delalloc_release_space(inode
,
1229 (page_cnt
- i_done
) << PAGE_CACHE_SHIFT
);
1233 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1234 &cached_state
, GFP_NOFS
);
1236 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1237 page_start
, page_end
- 1, &cached_state
,
1240 for (i
= 0; i
< i_done
; i
++) {
1241 clear_page_dirty_for_io(pages
[i
]);
1242 ClearPageChecked(pages
[i
]);
1243 set_page_extent_mapped(pages
[i
]);
1244 set_page_dirty(pages
[i
]);
1245 unlock_page(pages
[i
]);
1246 page_cache_release(pages
[i
]);
1250 for (i
= 0; i
< i_done
; i
++) {
1251 unlock_page(pages
[i
]);
1252 page_cache_release(pages
[i
]);
1254 btrfs_delalloc_release_space(inode
, page_cnt
<< PAGE_CACHE_SHIFT
);
1259 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1260 struct btrfs_ioctl_defrag_range_args
*range
,
1261 u64 newer_than
, unsigned long max_to_defrag
)
1263 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1264 struct file_ra_state
*ra
= NULL
;
1265 unsigned long last_index
;
1266 u64 isize
= i_size_read(inode
);
1270 u64 newer_off
= range
->start
;
1272 unsigned long ra_index
= 0;
1274 int defrag_count
= 0;
1275 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1276 u32 extent_thresh
= range
->extent_thresh
;
1277 unsigned long max_cluster
= (256 * 1024) >> PAGE_CACHE_SHIFT
;
1278 unsigned long cluster
= max_cluster
;
1279 u64 new_align
= ~((u64
)128 * 1024 - 1);
1280 struct page
**pages
= NULL
;
1285 if (range
->start
>= isize
)
1288 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1289 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1291 if (range
->compress_type
)
1292 compress_type
= range
->compress_type
;
1295 if (extent_thresh
== 0)
1296 extent_thresh
= 256 * 1024;
1299 * if we were not given a file, allocate a readahead
1303 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
1306 file_ra_state_init(ra
, inode
->i_mapping
);
1311 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*),
1318 /* find the last page to defrag */
1319 if (range
->start
+ range
->len
> range
->start
) {
1320 last_index
= min_t(u64
, isize
- 1,
1321 range
->start
+ range
->len
- 1) >> PAGE_CACHE_SHIFT
;
1323 last_index
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1327 ret
= find_new_extents(root
, inode
, newer_than
,
1328 &newer_off
, 64 * 1024);
1330 range
->start
= newer_off
;
1332 * we always align our defrag to help keep
1333 * the extents in the file evenly spaced
1335 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1339 i
= range
->start
>> PAGE_CACHE_SHIFT
;
1342 max_to_defrag
= last_index
+ 1;
1345 * make writeback starts from i, so the defrag range can be
1346 * written sequentially.
1348 if (i
< inode
->i_mapping
->writeback_index
)
1349 inode
->i_mapping
->writeback_index
= i
;
1351 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1352 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_CACHE_SIZE
))) {
1354 * make sure we stop running if someone unmounts
1357 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1360 if (btrfs_defrag_cancelled(root
->fs_info
)) {
1361 printk(KERN_DEBUG
"BTRFS: defrag_file cancelled\n");
1366 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_CACHE_SHIFT
,
1367 extent_thresh
, &last_len
, &skip
,
1368 &defrag_end
, range
->flags
&
1369 BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1372 * the should_defrag function tells us how much to skip
1373 * bump our counter by the suggested amount
1375 next
= DIV_ROUND_UP(skip
, PAGE_CACHE_SIZE
);
1376 i
= max(i
+ 1, next
);
1381 cluster
= (PAGE_CACHE_ALIGN(defrag_end
) >>
1382 PAGE_CACHE_SHIFT
) - i
;
1383 cluster
= min(cluster
, max_cluster
);
1385 cluster
= max_cluster
;
1388 if (i
+ cluster
> ra_index
) {
1389 ra_index
= max(i
, ra_index
);
1390 btrfs_force_ra(inode
->i_mapping
, ra
, file
, ra_index
,
1392 ra_index
+= max_cluster
;
1395 mutex_lock(&inode
->i_mutex
);
1396 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
1397 BTRFS_I(inode
)->force_compress
= compress_type
;
1398 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1400 mutex_unlock(&inode
->i_mutex
);
1404 defrag_count
+= ret
;
1405 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1406 mutex_unlock(&inode
->i_mutex
);
1409 if (newer_off
== (u64
)-1)
1415 newer_off
= max(newer_off
+ 1,
1416 (u64
)i
<< PAGE_CACHE_SHIFT
);
1418 ret
= find_new_extents(root
, inode
,
1419 newer_than
, &newer_off
,
1422 range
->start
= newer_off
;
1423 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1430 last_len
+= ret
<< PAGE_CACHE_SHIFT
;
1438 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1439 filemap_flush(inode
->i_mapping
);
1440 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1441 &BTRFS_I(inode
)->runtime_flags
))
1442 filemap_flush(inode
->i_mapping
);
1445 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1446 /* the filemap_flush will queue IO into the worker threads, but
1447 * we have to make sure the IO is actually started and that
1448 * ordered extents get created before we return
1450 atomic_inc(&root
->fs_info
->async_submit_draining
);
1451 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
1452 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1453 wait_event(root
->fs_info
->async_submit_wait
,
1454 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
1455 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
1457 atomic_dec(&root
->fs_info
->async_submit_draining
);
1460 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1461 btrfs_set_fs_incompat(root
->fs_info
, COMPRESS_LZO
);
1467 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1468 mutex_lock(&inode
->i_mutex
);
1469 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
1470 mutex_unlock(&inode
->i_mutex
);
1478 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1484 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
1485 struct btrfs_ioctl_vol_args
*vol_args
;
1486 struct btrfs_trans_handle
*trans
;
1487 struct btrfs_device
*device
= NULL
;
1490 char *devstr
= NULL
;
1494 if (!capable(CAP_SYS_ADMIN
))
1497 ret
= mnt_want_write_file(file
);
1501 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
1503 mnt_drop_write_file(file
);
1504 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1507 mutex_lock(&root
->fs_info
->volume_mutex
);
1508 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1509 if (IS_ERR(vol_args
)) {
1510 ret
= PTR_ERR(vol_args
);
1514 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1516 sizestr
= vol_args
->name
;
1517 devstr
= strchr(sizestr
, ':');
1519 sizestr
= devstr
+ 1;
1521 devstr
= vol_args
->name
;
1522 ret
= kstrtoull(devstr
, 10, &devid
);
1529 btrfs_info(root
->fs_info
, "resizing devid %llu", devid
);
1532 device
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
1534 btrfs_info(root
->fs_info
, "resizer unable to find device %llu",
1540 if (!device
->writeable
) {
1541 btrfs_info(root
->fs_info
,
1542 "resizer unable to apply on readonly device %llu",
1548 if (!strcmp(sizestr
, "max"))
1549 new_size
= device
->bdev
->bd_inode
->i_size
;
1551 if (sizestr
[0] == '-') {
1554 } else if (sizestr
[0] == '+') {
1558 new_size
= memparse(sizestr
, &retptr
);
1559 if (*retptr
!= '\0' || new_size
== 0) {
1565 if (device
->is_tgtdev_for_dev_replace
) {
1570 old_size
= btrfs_device_get_total_bytes(device
);
1573 if (new_size
> old_size
) {
1577 new_size
= old_size
- new_size
;
1578 } else if (mod
> 0) {
1579 if (new_size
> ULLONG_MAX
- old_size
) {
1583 new_size
= old_size
+ new_size
;
1586 if (new_size
< 256 * 1024 * 1024) {
1590 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1595 do_div(new_size
, root
->sectorsize
);
1596 new_size
*= root
->sectorsize
;
1598 printk_in_rcu(KERN_INFO
"BTRFS: new size for %s is %llu\n",
1599 rcu_str_deref(device
->name
), new_size
);
1601 if (new_size
> old_size
) {
1602 trans
= btrfs_start_transaction(root
, 0);
1603 if (IS_ERR(trans
)) {
1604 ret
= PTR_ERR(trans
);
1607 ret
= btrfs_grow_device(trans
, device
, new_size
);
1608 btrfs_commit_transaction(trans
, root
);
1609 } else if (new_size
< old_size
) {
1610 ret
= btrfs_shrink_device(device
, new_size
);
1611 } /* equal, nothing need to do */
1616 mutex_unlock(&root
->fs_info
->volume_mutex
);
1617 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
1618 mnt_drop_write_file(file
);
1622 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1623 char *name
, unsigned long fd
, int subvol
,
1624 u64
*transid
, bool readonly
,
1625 struct btrfs_qgroup_inherit
*inherit
)
1630 ret
= mnt_want_write_file(file
);
1634 namelen
= strlen(name
);
1635 if (strchr(name
, '/')) {
1637 goto out_drop_write
;
1640 if (name
[0] == '.' &&
1641 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1643 goto out_drop_write
;
1647 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1648 NULL
, transid
, readonly
, inherit
);
1650 struct fd src
= fdget(fd
);
1651 struct inode
*src_inode
;
1654 goto out_drop_write
;
1657 src_inode
= file_inode(src
.file
);
1658 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1659 btrfs_info(BTRFS_I(src_inode
)->root
->fs_info
,
1660 "Snapshot src from another FS");
1662 } else if (!inode_owner_or_capable(src_inode
)) {
1664 * Subvolume creation is not restricted, but snapshots
1665 * are limited to own subvolumes only
1669 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1670 BTRFS_I(src_inode
)->root
,
1671 transid
, readonly
, inherit
);
1676 mnt_drop_write_file(file
);
1681 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1682 void __user
*arg
, int subvol
)
1684 struct btrfs_ioctl_vol_args
*vol_args
;
1687 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1688 if (IS_ERR(vol_args
))
1689 return PTR_ERR(vol_args
);
1690 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1692 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1693 vol_args
->fd
, subvol
,
1700 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1701 void __user
*arg
, int subvol
)
1703 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1707 bool readonly
= false;
1708 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1710 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1711 if (IS_ERR(vol_args
))
1712 return PTR_ERR(vol_args
);
1713 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1715 if (vol_args
->flags
&
1716 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1717 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1722 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1724 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1726 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1727 if (vol_args
->size
> PAGE_CACHE_SIZE
) {
1731 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1732 if (IS_ERR(inherit
)) {
1733 ret
= PTR_ERR(inherit
);
1738 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1739 vol_args
->fd
, subvol
, ptr
,
1744 if (ptr
&& copy_to_user(arg
+
1745 offsetof(struct btrfs_ioctl_vol_args_v2
,
1757 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1760 struct inode
*inode
= file_inode(file
);
1761 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1765 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
)
1768 down_read(&root
->fs_info
->subvol_sem
);
1769 if (btrfs_root_readonly(root
))
1770 flags
|= BTRFS_SUBVOL_RDONLY
;
1771 up_read(&root
->fs_info
->subvol_sem
);
1773 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1779 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1782 struct inode
*inode
= file_inode(file
);
1783 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1784 struct btrfs_trans_handle
*trans
;
1789 if (!inode_owner_or_capable(inode
))
1792 ret
= mnt_want_write_file(file
);
1796 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
1798 goto out_drop_write
;
1801 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1803 goto out_drop_write
;
1806 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1808 goto out_drop_write
;
1811 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1813 goto out_drop_write
;
1816 down_write(&root
->fs_info
->subvol_sem
);
1819 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1822 root_flags
= btrfs_root_flags(&root
->root_item
);
1823 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1824 btrfs_set_root_flags(&root
->root_item
,
1825 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1828 * Block RO -> RW transition if this subvolume is involved in
1831 spin_lock(&root
->root_item_lock
);
1832 if (root
->send_in_progress
== 0) {
1833 btrfs_set_root_flags(&root
->root_item
,
1834 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1835 spin_unlock(&root
->root_item_lock
);
1837 spin_unlock(&root
->root_item_lock
);
1838 btrfs_warn(root
->fs_info
,
1839 "Attempt to set subvolume %llu read-write during send",
1840 root
->root_key
.objectid
);
1846 trans
= btrfs_start_transaction(root
, 1);
1847 if (IS_ERR(trans
)) {
1848 ret
= PTR_ERR(trans
);
1852 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
1853 &root
->root_key
, &root
->root_item
);
1855 btrfs_commit_transaction(trans
, root
);
1858 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1860 up_write(&root
->fs_info
->subvol_sem
);
1862 mnt_drop_write_file(file
);
1868 * helper to check if the subvolume references other subvolumes
1870 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1872 struct btrfs_path
*path
;
1873 struct btrfs_dir_item
*di
;
1874 struct btrfs_key key
;
1878 path
= btrfs_alloc_path();
1882 /* Make sure this root isn't set as the default subvol */
1883 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
1884 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
, path
,
1885 dir_id
, "default", 7, 0);
1886 if (di
&& !IS_ERR(di
)) {
1887 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
1888 if (key
.objectid
== root
->root_key
.objectid
) {
1890 btrfs_err(root
->fs_info
, "deleting default subvolume "
1891 "%llu is not allowed", key
.objectid
);
1894 btrfs_release_path(path
);
1897 key
.objectid
= root
->root_key
.objectid
;
1898 key
.type
= BTRFS_ROOT_REF_KEY
;
1899 key
.offset
= (u64
)-1;
1901 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
1908 if (path
->slots
[0] > 0) {
1910 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1911 if (key
.objectid
== root
->root_key
.objectid
&&
1912 key
.type
== BTRFS_ROOT_REF_KEY
)
1916 btrfs_free_path(path
);
1920 static noinline
int key_in_sk(struct btrfs_key
*key
,
1921 struct btrfs_ioctl_search_key
*sk
)
1923 struct btrfs_key test
;
1926 test
.objectid
= sk
->min_objectid
;
1927 test
.type
= sk
->min_type
;
1928 test
.offset
= sk
->min_offset
;
1930 ret
= btrfs_comp_cpu_keys(key
, &test
);
1934 test
.objectid
= sk
->max_objectid
;
1935 test
.type
= sk
->max_type
;
1936 test
.offset
= sk
->max_offset
;
1938 ret
= btrfs_comp_cpu_keys(key
, &test
);
1944 static noinline
int copy_to_sk(struct btrfs_root
*root
,
1945 struct btrfs_path
*path
,
1946 struct btrfs_key
*key
,
1947 struct btrfs_ioctl_search_key
*sk
,
1950 unsigned long *sk_offset
,
1954 struct extent_buffer
*leaf
;
1955 struct btrfs_ioctl_search_header sh
;
1956 unsigned long item_off
;
1957 unsigned long item_len
;
1963 leaf
= path
->nodes
[0];
1964 slot
= path
->slots
[0];
1965 nritems
= btrfs_header_nritems(leaf
);
1967 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1971 found_transid
= btrfs_header_generation(leaf
);
1973 for (i
= slot
; i
< nritems
; i
++) {
1974 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1975 item_len
= btrfs_item_size_nr(leaf
, i
);
1977 btrfs_item_key_to_cpu(leaf
, key
, i
);
1978 if (!key_in_sk(key
, sk
))
1981 if (sizeof(sh
) + item_len
> *buf_size
) {
1988 * return one empty item back for v1, which does not
1992 *buf_size
= sizeof(sh
) + item_len
;
1997 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
2002 sh
.objectid
= key
->objectid
;
2003 sh
.offset
= key
->offset
;
2004 sh
.type
= key
->type
;
2006 sh
.transid
= found_transid
;
2008 /* copy search result header */
2009 if (copy_to_user(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
2014 *sk_offset
+= sizeof(sh
);
2017 char __user
*up
= ubuf
+ *sk_offset
;
2019 if (read_extent_buffer_to_user(leaf
, up
,
2020 item_off
, item_len
)) {
2025 *sk_offset
+= item_len
;
2029 if (ret
) /* -EOVERFLOW from above */
2032 if (*num_found
>= sk
->nr_items
) {
2039 if (key
->offset
< (u64
)-1 && key
->offset
< sk
->max_offset
)
2041 else if (key
->type
< (u8
)-1 && key
->type
< sk
->max_type
) {
2044 } else if (key
->objectid
< (u64
)-1 && key
->objectid
< sk
->max_objectid
) {
2052 * 0: all items from this leaf copied, continue with next
2053 * 1: * more items can be copied, but unused buffer is too small
2054 * * all items were found
2055 * Either way, it will stops the loop which iterates to the next
2057 * -EOVERFLOW: item was to large for buffer
2058 * -EFAULT: could not copy extent buffer back to userspace
2063 static noinline
int search_ioctl(struct inode
*inode
,
2064 struct btrfs_ioctl_search_key
*sk
,
2068 struct btrfs_root
*root
;
2069 struct btrfs_key key
;
2070 struct btrfs_path
*path
;
2071 struct btrfs_fs_info
*info
= BTRFS_I(inode
)->root
->fs_info
;
2074 unsigned long sk_offset
= 0;
2076 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2077 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2081 path
= btrfs_alloc_path();
2085 if (sk
->tree_id
== 0) {
2086 /* search the root of the inode that was passed */
2087 root
= BTRFS_I(inode
)->root
;
2089 key
.objectid
= sk
->tree_id
;
2090 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2091 key
.offset
= (u64
)-1;
2092 root
= btrfs_read_fs_root_no_name(info
, &key
);
2094 printk(KERN_ERR
"BTRFS: could not find root %llu\n",
2096 btrfs_free_path(path
);
2101 key
.objectid
= sk
->min_objectid
;
2102 key
.type
= sk
->min_type
;
2103 key
.offset
= sk
->min_offset
;
2106 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2112 ret
= copy_to_sk(root
, path
, &key
, sk
, buf_size
, ubuf
,
2113 &sk_offset
, &num_found
);
2114 btrfs_release_path(path
);
2122 sk
->nr_items
= num_found
;
2123 btrfs_free_path(path
);
2127 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2130 struct btrfs_ioctl_search_args __user
*uargs
;
2131 struct btrfs_ioctl_search_key sk
;
2132 struct inode
*inode
;
2136 if (!capable(CAP_SYS_ADMIN
))
2139 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2141 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2144 buf_size
= sizeof(uargs
->buf
);
2146 inode
= file_inode(file
);
2147 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2150 * In the origin implementation an overflow is handled by returning a
2151 * search header with a len of zero, so reset ret.
2153 if (ret
== -EOVERFLOW
)
2156 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2161 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2164 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2165 struct btrfs_ioctl_search_args_v2 args
;
2166 struct inode
*inode
;
2169 const size_t buf_limit
= 16 * 1024 * 1024;
2171 if (!capable(CAP_SYS_ADMIN
))
2174 /* copy search header and buffer size */
2175 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2176 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2179 buf_size
= args
.buf_size
;
2181 if (buf_size
< sizeof(struct btrfs_ioctl_search_header
))
2184 /* limit result size to 16MB */
2185 if (buf_size
> buf_limit
)
2186 buf_size
= buf_limit
;
2188 inode
= file_inode(file
);
2189 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2190 (char *)(&uarg
->buf
[0]));
2191 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2193 else if (ret
== -EOVERFLOW
&&
2194 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2201 * Search INODE_REFs to identify path name of 'dirid' directory
2202 * in a 'tree_id' tree. and sets path name to 'name'.
2204 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2205 u64 tree_id
, u64 dirid
, char *name
)
2207 struct btrfs_root
*root
;
2208 struct btrfs_key key
;
2214 struct btrfs_inode_ref
*iref
;
2215 struct extent_buffer
*l
;
2216 struct btrfs_path
*path
;
2218 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2223 path
= btrfs_alloc_path();
2227 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
2229 key
.objectid
= tree_id
;
2230 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2231 key
.offset
= (u64
)-1;
2232 root
= btrfs_read_fs_root_no_name(info
, &key
);
2234 printk(KERN_ERR
"BTRFS: could not find root %llu\n", tree_id
);
2239 key
.objectid
= dirid
;
2240 key
.type
= BTRFS_INODE_REF_KEY
;
2241 key
.offset
= (u64
)-1;
2244 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2248 ret
= btrfs_previous_item(root
, path
, dirid
,
2249 BTRFS_INODE_REF_KEY
);
2259 slot
= path
->slots
[0];
2260 btrfs_item_key_to_cpu(l
, &key
, slot
);
2262 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2263 len
= btrfs_inode_ref_name_len(l
, iref
);
2265 total_len
+= len
+ 1;
2267 ret
= -ENAMETOOLONG
;
2272 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2274 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2277 btrfs_release_path(path
);
2278 key
.objectid
= key
.offset
;
2279 key
.offset
= (u64
)-1;
2280 dirid
= key
.objectid
;
2282 memmove(name
, ptr
, total_len
);
2283 name
[total_len
] = '\0';
2286 btrfs_free_path(path
);
2290 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2293 struct btrfs_ioctl_ino_lookup_args
*args
;
2294 struct inode
*inode
;
2297 if (!capable(CAP_SYS_ADMIN
))
2300 args
= memdup_user(argp
, sizeof(*args
));
2302 return PTR_ERR(args
);
2304 inode
= file_inode(file
);
2306 if (args
->treeid
== 0)
2307 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2309 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2310 args
->treeid
, args
->objectid
,
2313 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2320 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2323 struct dentry
*parent
= file
->f_path
.dentry
;
2324 struct dentry
*dentry
;
2325 struct inode
*dir
= parent
->d_inode
;
2326 struct inode
*inode
;
2327 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2328 struct btrfs_root
*dest
= NULL
;
2329 struct btrfs_ioctl_vol_args
*vol_args
;
2330 struct btrfs_trans_handle
*trans
;
2331 struct btrfs_block_rsv block_rsv
;
2333 u64 qgroup_reserved
;
2338 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2339 if (IS_ERR(vol_args
))
2340 return PTR_ERR(vol_args
);
2342 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2343 namelen
= strlen(vol_args
->name
);
2344 if (strchr(vol_args
->name
, '/') ||
2345 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2350 err
= mnt_want_write_file(file
);
2355 err
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
2357 goto out_drop_write
;
2358 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2359 if (IS_ERR(dentry
)) {
2360 err
= PTR_ERR(dentry
);
2361 goto out_unlock_dir
;
2364 if (!dentry
->d_inode
) {
2369 inode
= dentry
->d_inode
;
2370 dest
= BTRFS_I(inode
)->root
;
2371 if (!capable(CAP_SYS_ADMIN
)) {
2373 * Regular user. Only allow this with a special mount
2374 * option, when the user has write+exec access to the
2375 * subvol root, and when rmdir(2) would have been
2378 * Note that this is _not_ check that the subvol is
2379 * empty or doesn't contain data that we wouldn't
2380 * otherwise be able to delete.
2382 * Users who want to delete empty subvols should try
2386 if (!btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
2390 * Do not allow deletion if the parent dir is the same
2391 * as the dir to be deleted. That means the ioctl
2392 * must be called on the dentry referencing the root
2393 * of the subvol, not a random directory contained
2400 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2405 /* check if subvolume may be deleted by a user */
2406 err
= btrfs_may_delete(dir
, dentry
, 1);
2410 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
2415 mutex_lock(&inode
->i_mutex
);
2418 * Don't allow to delete a subvolume with send in progress. This is
2419 * inside the i_mutex so the error handling that has to drop the bit
2420 * again is not run concurrently.
2422 spin_lock(&dest
->root_item_lock
);
2423 root_flags
= btrfs_root_flags(&dest
->root_item
);
2424 if (dest
->send_in_progress
== 0) {
2425 btrfs_set_root_flags(&dest
->root_item
,
2426 root_flags
| BTRFS_ROOT_SUBVOL_DEAD
);
2427 spin_unlock(&dest
->root_item_lock
);
2429 spin_unlock(&dest
->root_item_lock
);
2430 btrfs_warn(root
->fs_info
,
2431 "Attempt to delete subvolume %llu during send",
2432 dest
->root_key
.objectid
);
2437 d_invalidate(dentry
);
2439 down_write(&root
->fs_info
->subvol_sem
);
2441 err
= may_destroy_subvol(dest
);
2445 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
2447 * One for dir inode, two for dir entries, two for root
2450 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
2451 5, &qgroup_reserved
, true);
2455 trans
= btrfs_start_transaction(root
, 0);
2456 if (IS_ERR(trans
)) {
2457 err
= PTR_ERR(trans
);
2460 trans
->block_rsv
= &block_rsv
;
2461 trans
->bytes_reserved
= block_rsv
.size
;
2463 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
2464 dest
->root_key
.objectid
,
2465 dentry
->d_name
.name
,
2466 dentry
->d_name
.len
);
2469 btrfs_abort_transaction(trans
, root
, ret
);
2473 btrfs_record_root_in_trans(trans
, dest
);
2475 memset(&dest
->root_item
.drop_progress
, 0,
2476 sizeof(dest
->root_item
.drop_progress
));
2477 dest
->root_item
.drop_level
= 0;
2478 btrfs_set_root_refs(&dest
->root_item
, 0);
2480 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &dest
->state
)) {
2481 ret
= btrfs_insert_orphan_item(trans
,
2482 root
->fs_info
->tree_root
,
2483 dest
->root_key
.objectid
);
2485 btrfs_abort_transaction(trans
, root
, ret
);
2491 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2492 dest
->root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
2493 dest
->root_key
.objectid
);
2494 if (ret
&& ret
!= -ENOENT
) {
2495 btrfs_abort_transaction(trans
, root
, ret
);
2499 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
2500 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2501 dest
->root_item
.received_uuid
,
2502 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
2503 dest
->root_key
.objectid
);
2504 if (ret
&& ret
!= -ENOENT
) {
2505 btrfs_abort_transaction(trans
, root
, ret
);
2512 trans
->block_rsv
= NULL
;
2513 trans
->bytes_reserved
= 0;
2514 ret
= btrfs_end_transaction(trans
, root
);
2517 inode
->i_flags
|= S_DEAD
;
2519 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
2521 up_write(&root
->fs_info
->subvol_sem
);
2523 spin_lock(&dest
->root_item_lock
);
2524 root_flags
= btrfs_root_flags(&dest
->root_item
);
2525 btrfs_set_root_flags(&dest
->root_item
,
2526 root_flags
& ~BTRFS_ROOT_SUBVOL_DEAD
);
2527 spin_unlock(&dest
->root_item_lock
);
2529 mutex_unlock(&inode
->i_mutex
);
2531 shrink_dcache_sb(root
->fs_info
->sb
);
2532 btrfs_invalidate_inodes(dest
);
2534 ASSERT(dest
->send_in_progress
== 0);
2537 if (dest
->ino_cache_inode
) {
2538 iput(dest
->ino_cache_inode
);
2539 dest
->ino_cache_inode
= NULL
;
2545 mutex_unlock(&dir
->i_mutex
);
2547 mnt_drop_write_file(file
);
2553 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2555 struct inode
*inode
= file_inode(file
);
2556 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2557 struct btrfs_ioctl_defrag_range_args
*range
;
2560 ret
= mnt_want_write_file(file
);
2564 if (btrfs_root_readonly(root
)) {
2569 switch (inode
->i_mode
& S_IFMT
) {
2571 if (!capable(CAP_SYS_ADMIN
)) {
2575 ret
= btrfs_defrag_root(root
);
2578 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
);
2581 if (!(file
->f_mode
& FMODE_WRITE
)) {
2586 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2593 if (copy_from_user(range
, argp
,
2599 /* compression requires us to start the IO */
2600 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2601 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2602 range
->extent_thresh
= (u32
)-1;
2605 /* the rest are all set to zero by kzalloc */
2606 range
->len
= (u64
)-1;
2608 ret
= btrfs_defrag_file(file_inode(file
), file
,
2618 mnt_drop_write_file(file
);
2622 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
2624 struct btrfs_ioctl_vol_args
*vol_args
;
2627 if (!capable(CAP_SYS_ADMIN
))
2630 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2632 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2635 mutex_lock(&root
->fs_info
->volume_mutex
);
2636 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2637 if (IS_ERR(vol_args
)) {
2638 ret
= PTR_ERR(vol_args
);
2642 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2643 ret
= btrfs_init_new_device(root
, vol_args
->name
);
2646 btrfs_info(root
->fs_info
, "disk added %s",vol_args
->name
);
2650 mutex_unlock(&root
->fs_info
->volume_mutex
);
2651 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2655 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
2657 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
2658 struct btrfs_ioctl_vol_args
*vol_args
;
2661 if (!capable(CAP_SYS_ADMIN
))
2664 ret
= mnt_want_write_file(file
);
2668 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2669 if (IS_ERR(vol_args
)) {
2670 ret
= PTR_ERR(vol_args
);
2674 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2676 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2678 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2682 mutex_lock(&root
->fs_info
->volume_mutex
);
2683 ret
= btrfs_rm_device(root
, vol_args
->name
);
2684 mutex_unlock(&root
->fs_info
->volume_mutex
);
2685 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2688 btrfs_info(root
->fs_info
, "disk deleted %s",vol_args
->name
);
2693 mnt_drop_write_file(file
);
2697 static long btrfs_ioctl_fs_info(struct btrfs_root
*root
, void __user
*arg
)
2699 struct btrfs_ioctl_fs_info_args
*fi_args
;
2700 struct btrfs_device
*device
;
2701 struct btrfs_device
*next
;
2702 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2705 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
2709 mutex_lock(&fs_devices
->device_list_mutex
);
2710 fi_args
->num_devices
= fs_devices
->num_devices
;
2711 memcpy(&fi_args
->fsid
, root
->fs_info
->fsid
, sizeof(fi_args
->fsid
));
2713 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
2714 if (device
->devid
> fi_args
->max_id
)
2715 fi_args
->max_id
= device
->devid
;
2717 mutex_unlock(&fs_devices
->device_list_mutex
);
2719 fi_args
->nodesize
= root
->fs_info
->super_copy
->nodesize
;
2720 fi_args
->sectorsize
= root
->fs_info
->super_copy
->sectorsize
;
2721 fi_args
->clone_alignment
= root
->fs_info
->super_copy
->sectorsize
;
2723 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
2730 static long btrfs_ioctl_dev_info(struct btrfs_root
*root
, void __user
*arg
)
2732 struct btrfs_ioctl_dev_info_args
*di_args
;
2733 struct btrfs_device
*dev
;
2734 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2736 char *s_uuid
= NULL
;
2738 di_args
= memdup_user(arg
, sizeof(*di_args
));
2739 if (IS_ERR(di_args
))
2740 return PTR_ERR(di_args
);
2742 if (!btrfs_is_empty_uuid(di_args
->uuid
))
2743 s_uuid
= di_args
->uuid
;
2745 mutex_lock(&fs_devices
->device_list_mutex
);
2746 dev
= btrfs_find_device(root
->fs_info
, di_args
->devid
, s_uuid
, NULL
);
2753 di_args
->devid
= dev
->devid
;
2754 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
2755 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
2756 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
2758 struct rcu_string
*name
;
2761 name
= rcu_dereference(dev
->name
);
2762 strncpy(di_args
->path
, name
->str
, sizeof(di_args
->path
));
2764 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
2766 di_args
->path
[0] = '\0';
2770 mutex_unlock(&fs_devices
->device_list_mutex
);
2771 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
2778 static struct page
*extent_same_get_page(struct inode
*inode
, u64 off
)
2782 struct extent_io_tree
*tree
= &BTRFS_I(inode
)->io_tree
;
2784 index
= off
>> PAGE_CACHE_SHIFT
;
2786 page
= grab_cache_page(inode
->i_mapping
, index
);
2790 if (!PageUptodate(page
)) {
2791 if (extent_read_full_page_nolock(tree
, page
, btrfs_get_extent
,
2795 if (!PageUptodate(page
)) {
2797 page_cache_release(page
);
2806 static inline void lock_extent_range(struct inode
*inode
, u64 off
, u64 len
)
2808 /* do any pending delalloc/csum calc on src, one way or
2809 another, and lock file content */
2811 struct btrfs_ordered_extent
*ordered
;
2812 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2813 ordered
= btrfs_lookup_first_ordered_extent(inode
,
2816 ordered
->file_offset
+ ordered
->len
<= off
||
2817 ordered
->file_offset
>= off
+ len
) &&
2818 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
2819 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
)) {
2821 btrfs_put_ordered_extent(ordered
);
2824 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2826 btrfs_put_ordered_extent(ordered
);
2827 btrfs_wait_ordered_range(inode
, off
, len
);
2831 static void btrfs_double_unlock(struct inode
*inode1
, u64 loff1
,
2832 struct inode
*inode2
, u64 loff2
, u64 len
)
2834 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
2835 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
2837 mutex_unlock(&inode1
->i_mutex
);
2838 mutex_unlock(&inode2
->i_mutex
);
2841 static void btrfs_double_lock(struct inode
*inode1
, u64 loff1
,
2842 struct inode
*inode2
, u64 loff2
, u64 len
)
2844 if (inode1
< inode2
) {
2845 swap(inode1
, inode2
);
2849 mutex_lock_nested(&inode1
->i_mutex
, I_MUTEX_PARENT
);
2850 lock_extent_range(inode1
, loff1
, len
);
2851 if (inode1
!= inode2
) {
2852 mutex_lock_nested(&inode2
->i_mutex
, I_MUTEX_CHILD
);
2853 lock_extent_range(inode2
, loff2
, len
);
2857 static int btrfs_cmp_data(struct inode
*src
, u64 loff
, struct inode
*dst
,
2858 u64 dst_loff
, u64 len
)
2861 struct page
*src_page
, *dst_page
;
2862 unsigned int cmp_len
= PAGE_CACHE_SIZE
;
2863 void *addr
, *dst_addr
;
2866 if (len
< PAGE_CACHE_SIZE
)
2869 src_page
= extent_same_get_page(src
, loff
);
2872 dst_page
= extent_same_get_page(dst
, dst_loff
);
2874 page_cache_release(src_page
);
2877 addr
= kmap_atomic(src_page
);
2878 dst_addr
= kmap_atomic(dst_page
);
2880 flush_dcache_page(src_page
);
2881 flush_dcache_page(dst_page
);
2883 if (memcmp(addr
, dst_addr
, cmp_len
))
2884 ret
= BTRFS_SAME_DATA_DIFFERS
;
2886 kunmap_atomic(addr
);
2887 kunmap_atomic(dst_addr
);
2888 page_cache_release(src_page
);
2889 page_cache_release(dst_page
);
2895 dst_loff
+= cmp_len
;
2902 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64 len
)
2904 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
2906 if (off
+ len
> inode
->i_size
|| off
+ len
< off
)
2908 /* Check that we are block aligned - btrfs_clone() requires this */
2909 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
2915 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 len
,
2916 struct inode
*dst
, u64 dst_loff
)
2921 * btrfs_clone() can't handle extents in the same file
2922 * yet. Once that works, we can drop this check and replace it
2923 * with a check for the same inode, but overlapping extents.
2928 btrfs_double_lock(src
, loff
, dst
, dst_loff
, len
);
2930 ret
= extent_same_check_offsets(src
, loff
, len
);
2934 ret
= extent_same_check_offsets(dst
, dst_loff
, len
);
2938 /* don't make the dst file partly checksummed */
2939 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
2940 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
2945 ret
= btrfs_cmp_data(src
, loff
, dst
, dst_loff
, len
);
2947 ret
= btrfs_clone(src
, dst
, loff
, len
, len
, dst_loff
);
2950 btrfs_double_unlock(src
, loff
, dst
, dst_loff
, len
);
2955 #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2957 static long btrfs_ioctl_file_extent_same(struct file
*file
,
2958 struct btrfs_ioctl_same_args __user
*argp
)
2960 struct btrfs_ioctl_same_args
*same
;
2961 struct btrfs_ioctl_same_extent_info
*info
;
2962 struct inode
*src
= file_inode(file
);
2968 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
2969 bool is_admin
= capable(CAP_SYS_ADMIN
);
2972 if (!(file
->f_mode
& FMODE_READ
))
2975 ret
= mnt_want_write_file(file
);
2979 if (get_user(count
, &argp
->dest_count
)) {
2984 size
= offsetof(struct btrfs_ioctl_same_args __user
, info
[count
]);
2986 same
= memdup_user(argp
, size
);
2989 ret
= PTR_ERR(same
);
2993 off
= same
->logical_offset
;
2997 * Limit the total length we will dedupe for each operation.
2998 * This is intended to bound the total time spent in this
2999 * ioctl to something sane.
3001 if (len
> BTRFS_MAX_DEDUPE_LEN
)
3002 len
= BTRFS_MAX_DEDUPE_LEN
;
3004 if (WARN_ON_ONCE(bs
< PAGE_CACHE_SIZE
)) {
3006 * Btrfs does not support blocksize < page_size. As a
3007 * result, btrfs_cmp_data() won't correctly handle
3008 * this situation without an update.
3015 if (S_ISDIR(src
->i_mode
))
3019 if (!S_ISREG(src
->i_mode
))
3022 /* pre-format output fields to sane values */
3023 for (i
= 0; i
< count
; i
++) {
3024 same
->info
[i
].bytes_deduped
= 0ULL;
3025 same
->info
[i
].status
= 0;
3028 for (i
= 0, info
= same
->info
; i
< count
; i
++, info
++) {
3030 struct fd dst_file
= fdget(info
->fd
);
3031 if (!dst_file
.file
) {
3032 info
->status
= -EBADF
;
3035 dst
= file_inode(dst_file
.file
);
3037 if (!(is_admin
|| (dst_file
.file
->f_mode
& FMODE_WRITE
))) {
3038 info
->status
= -EINVAL
;
3039 } else if (file
->f_path
.mnt
!= dst_file
.file
->f_path
.mnt
) {
3040 info
->status
= -EXDEV
;
3041 } else if (S_ISDIR(dst
->i_mode
)) {
3042 info
->status
= -EISDIR
;
3043 } else if (!S_ISREG(dst
->i_mode
)) {
3044 info
->status
= -EACCES
;
3046 info
->status
= btrfs_extent_same(src
, off
, len
, dst
,
3047 info
->logical_offset
);
3048 if (info
->status
== 0)
3049 info
->bytes_deduped
+= len
;
3054 ret
= copy_to_user(argp
, same
, size
);
3059 mnt_drop_write_file(file
);
3063 /* Helper to check and see if this root currently has a ref on the given disk
3064 * bytenr. If it does then we need to update the quota for this root. This
3065 * doesn't do anything if quotas aren't enabled.
3067 static int check_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3070 struct seq_list tree_mod_seq_elem
= {};
3071 struct ulist
*roots
;
3072 struct ulist_iterator uiter
;
3073 struct ulist_node
*root_node
= NULL
;
3076 if (!root
->fs_info
->quota_enabled
)
3079 btrfs_get_tree_mod_seq(root
->fs_info
, &tree_mod_seq_elem
);
3080 ret
= btrfs_find_all_roots(trans
, root
->fs_info
, disko
,
3081 tree_mod_seq_elem
.seq
, &roots
);
3085 ULIST_ITER_INIT(&uiter
);
3086 while ((root_node
= ulist_next(roots
, &uiter
))) {
3087 if (root_node
->val
== root
->objectid
) {
3094 btrfs_put_tree_mod_seq(root
->fs_info
, &tree_mod_seq_elem
);
3098 static int clone_finish_inode_update(struct btrfs_trans_handle
*trans
,
3099 struct inode
*inode
,
3104 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3107 inode_inc_iversion(inode
);
3108 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3110 * We round up to the block size at eof when determining which
3111 * extents to clone above, but shouldn't round up the file size.
3113 if (endoff
> destoff
+ olen
)
3114 endoff
= destoff
+ olen
;
3115 if (endoff
> inode
->i_size
)
3116 btrfs_i_size_write(inode
, endoff
);
3118 ret
= btrfs_update_inode(trans
, root
, inode
);
3120 btrfs_abort_transaction(trans
, root
, ret
);
3121 btrfs_end_transaction(trans
, root
);
3124 ret
= btrfs_end_transaction(trans
, root
);
3129 static void clone_update_extent_map(struct inode
*inode
,
3130 const struct btrfs_trans_handle
*trans
,
3131 const struct btrfs_path
*path
,
3132 const u64 hole_offset
,
3135 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
3136 struct extent_map
*em
;
3139 em
= alloc_extent_map();
3141 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3142 &BTRFS_I(inode
)->runtime_flags
);
3147 struct btrfs_file_extent_item
*fi
;
3149 fi
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3150 struct btrfs_file_extent_item
);
3151 btrfs_extent_item_to_extent_map(inode
, path
, fi
, false, em
);
3152 em
->generation
= -1;
3153 if (btrfs_file_extent_type(path
->nodes
[0], fi
) ==
3154 BTRFS_FILE_EXTENT_INLINE
)
3155 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3156 &BTRFS_I(inode
)->runtime_flags
);
3158 em
->start
= hole_offset
;
3160 em
->ram_bytes
= em
->len
;
3161 em
->orig_start
= hole_offset
;
3162 em
->block_start
= EXTENT_MAP_HOLE
;
3164 em
->orig_block_len
= 0;
3165 em
->compress_type
= BTRFS_COMPRESS_NONE
;
3166 em
->generation
= trans
->transid
;
3170 write_lock(&em_tree
->lock
);
3171 ret
= add_extent_mapping(em_tree
, em
, 1);
3172 write_unlock(&em_tree
->lock
);
3173 if (ret
!= -EEXIST
) {
3174 free_extent_map(em
);
3177 btrfs_drop_extent_cache(inode
, em
->start
,
3178 em
->start
+ em
->len
- 1, 0);
3182 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3183 &BTRFS_I(inode
)->runtime_flags
);
3187 * btrfs_clone() - clone a range from inode file to another
3189 * @src: Inode to clone from
3190 * @inode: Inode to clone to
3191 * @off: Offset within source to start clone from
3192 * @olen: Original length, passed by user, of range to clone
3193 * @olen_aligned: Block-aligned value of olen, extent_same uses
3194 * identical values here
3195 * @destoff: Offset within @inode to start clone
3197 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
3198 const u64 off
, const u64 olen
, const u64 olen_aligned
,
3201 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3202 struct btrfs_path
*path
= NULL
;
3203 struct extent_buffer
*leaf
;
3204 struct btrfs_trans_handle
*trans
;
3206 struct btrfs_key key
;
3211 const u64 len
= olen_aligned
;
3213 u64 last_dest_end
= destoff
;
3216 buf
= vmalloc(root
->nodesize
);
3220 path
= btrfs_alloc_path();
3228 key
.objectid
= btrfs_ino(src
);
3229 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3234 * note the key will change type as we walk through the
3237 path
->leave_spinning
= 1;
3238 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
3243 * First search, if no extent item that starts at offset off was
3244 * found but the previous item is an extent item, it's possible
3245 * it might overlap our target range, therefore process it.
3247 if (key
.offset
== off
&& ret
> 0 && path
->slots
[0] > 0) {
3248 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3249 path
->slots
[0] - 1);
3250 if (key
.type
== BTRFS_EXTENT_DATA_KEY
)
3254 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3257 if (path
->slots
[0] >= nritems
) {
3258 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
3263 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3265 leaf
= path
->nodes
[0];
3266 slot
= path
->slots
[0];
3268 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
3269 if (key
.type
> BTRFS_EXTENT_DATA_KEY
||
3270 key
.objectid
!= btrfs_ino(src
))
3273 if (key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3274 struct btrfs_file_extent_item
*extent
;
3277 struct btrfs_key new_key
;
3278 u64 disko
= 0, diskl
= 0;
3279 u64 datao
= 0, datal
= 0;
3283 extent
= btrfs_item_ptr(leaf
, slot
,
3284 struct btrfs_file_extent_item
);
3285 comp
= btrfs_file_extent_compression(leaf
, extent
);
3286 type
= btrfs_file_extent_type(leaf
, extent
);
3287 if (type
== BTRFS_FILE_EXTENT_REG
||
3288 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3289 disko
= btrfs_file_extent_disk_bytenr(leaf
,
3291 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
3293 datao
= btrfs_file_extent_offset(leaf
, extent
);
3294 datal
= btrfs_file_extent_num_bytes(leaf
,
3296 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3297 /* take upper bound, may be compressed */
3298 datal
= btrfs_file_extent_ram_bytes(leaf
,
3303 * The first search might have left us at an extent
3304 * item that ends before our target range's start, can
3305 * happen if we have holes and NO_HOLES feature enabled.
3307 if (key
.offset
+ datal
<= off
) {
3310 } else if (key
.offset
>= off
+ len
) {
3314 size
= btrfs_item_size_nr(leaf
, slot
);
3315 read_extent_buffer(leaf
, buf
,
3316 btrfs_item_ptr_offset(leaf
, slot
),
3319 btrfs_release_path(path
);
3320 path
->leave_spinning
= 0;
3322 memcpy(&new_key
, &key
, sizeof(new_key
));
3323 new_key
.objectid
= btrfs_ino(inode
);
3324 if (off
<= key
.offset
)
3325 new_key
.offset
= key
.offset
+ destoff
- off
;
3327 new_key
.offset
= destoff
;
3330 * Deal with a hole that doesn't have an extent item
3331 * that represents it (NO_HOLES feature enabled).
3332 * This hole is either in the middle of the cloning
3333 * range or at the beginning (fully overlaps it or
3334 * partially overlaps it).
3336 if (new_key
.offset
!= last_dest_end
)
3337 drop_start
= last_dest_end
;
3339 drop_start
= new_key
.offset
;
3342 * 1 - adjusting old extent (we may have to split it)
3343 * 1 - add new extent
3346 trans
= btrfs_start_transaction(root
, 3);
3347 if (IS_ERR(trans
)) {
3348 ret
= PTR_ERR(trans
);
3352 if (type
== BTRFS_FILE_EXTENT_REG
||
3353 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3355 * a | --- range to clone ---| b
3356 * | ------------- extent ------------- |
3359 /* subtract range b */
3360 if (key
.offset
+ datal
> off
+ len
)
3361 datal
= off
+ len
- key
.offset
;
3363 /* subtract range a */
3364 if (off
> key
.offset
) {
3365 datao
+= off
- key
.offset
;
3366 datal
-= off
- key
.offset
;
3369 ret
= btrfs_drop_extents(trans
, root
, inode
,
3371 new_key
.offset
+ datal
,
3374 if (ret
!= -EOPNOTSUPP
)
3375 btrfs_abort_transaction(trans
,
3377 btrfs_end_transaction(trans
, root
);
3381 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3384 btrfs_abort_transaction(trans
, root
,
3386 btrfs_end_transaction(trans
, root
);
3390 leaf
= path
->nodes
[0];
3391 slot
= path
->slots
[0];
3392 write_extent_buffer(leaf
, buf
,
3393 btrfs_item_ptr_offset(leaf
, slot
),
3396 extent
= btrfs_item_ptr(leaf
, slot
,
3397 struct btrfs_file_extent_item
);
3399 /* disko == 0 means it's a hole */
3403 btrfs_set_file_extent_offset(leaf
, extent
,
3405 btrfs_set_file_extent_num_bytes(leaf
, extent
,
3409 * We need to look up the roots that point at
3410 * this bytenr and see if the new root does. If
3411 * it does not we need to make sure we update
3412 * quotas appropriately.
3414 if (disko
&& root
!= BTRFS_I(src
)->root
&&
3415 disko
!= last_disko
) {
3416 no_quota
= check_ref(trans
, root
,
3419 btrfs_abort_transaction(trans
,
3422 btrfs_end_transaction(trans
,
3430 inode_add_bytes(inode
, datal
);
3431 ret
= btrfs_inc_extent_ref(trans
, root
,
3433 root
->root_key
.objectid
,
3435 new_key
.offset
- datao
,
3438 btrfs_abort_transaction(trans
,
3441 btrfs_end_transaction(trans
,
3447 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3450 u64 aligned_end
= 0;
3452 if (off
> key
.offset
) {
3453 skip
= off
- key
.offset
;
3454 new_key
.offset
+= skip
;
3457 if (key
.offset
+ datal
> off
+ len
)
3458 trim
= key
.offset
+ datal
- (off
+ len
);
3460 if (comp
&& (skip
|| trim
)) {
3462 btrfs_end_transaction(trans
, root
);
3465 size
-= skip
+ trim
;
3466 datal
-= skip
+ trim
;
3468 aligned_end
= ALIGN(new_key
.offset
+ datal
,
3470 ret
= btrfs_drop_extents(trans
, root
, inode
,
3475 if (ret
!= -EOPNOTSUPP
)
3476 btrfs_abort_transaction(trans
,
3478 btrfs_end_transaction(trans
, root
);
3482 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3485 btrfs_abort_transaction(trans
, root
,
3487 btrfs_end_transaction(trans
, root
);
3493 btrfs_file_extent_calc_inline_size(0);
3494 memmove(buf
+start
, buf
+start
+skip
,
3498 leaf
= path
->nodes
[0];
3499 slot
= path
->slots
[0];
3500 write_extent_buffer(leaf
, buf
,
3501 btrfs_item_ptr_offset(leaf
, slot
),
3503 inode_add_bytes(inode
, datal
);
3506 /* If we have an implicit hole (NO_HOLES feature). */
3507 if (drop_start
< new_key
.offset
)
3508 clone_update_extent_map(inode
, trans
,
3510 new_key
.offset
- drop_start
);
3512 clone_update_extent_map(inode
, trans
, path
, 0, 0);
3514 btrfs_mark_buffer_dirty(leaf
);
3515 btrfs_release_path(path
);
3517 last_dest_end
= ALIGN(new_key
.offset
+ datal
,
3519 ret
= clone_finish_inode_update(trans
, inode
,
3524 if (new_key
.offset
+ datal
>= destoff
+ len
)
3527 btrfs_release_path(path
);
3532 if (last_dest_end
< destoff
+ len
) {
3534 * We have an implicit hole (NO_HOLES feature is enabled) that
3535 * fully or partially overlaps our cloning range at its end.
3537 btrfs_release_path(path
);
3540 * 1 - remove extent(s)
3543 trans
= btrfs_start_transaction(root
, 2);
3544 if (IS_ERR(trans
)) {
3545 ret
= PTR_ERR(trans
);
3548 ret
= btrfs_drop_extents(trans
, root
, inode
,
3549 last_dest_end
, destoff
+ len
, 1);
3551 if (ret
!= -EOPNOTSUPP
)
3552 btrfs_abort_transaction(trans
, root
, ret
);
3553 btrfs_end_transaction(trans
, root
);
3556 clone_update_extent_map(inode
, trans
, NULL
, last_dest_end
,
3557 destoff
+ len
- last_dest_end
);
3558 ret
= clone_finish_inode_update(trans
, inode
, destoff
+ len
,
3563 btrfs_free_path(path
);
3568 static noinline
long btrfs_ioctl_clone(struct file
*file
, unsigned long srcfd
,
3569 u64 off
, u64 olen
, u64 destoff
)
3571 struct inode
*inode
= file_inode(file
);
3572 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3577 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
3582 * - split compressed inline extents. annoying: we need to
3583 * decompress into destination's address_space (the file offset
3584 * may change, so source mapping won't do), then recompress (or
3585 * otherwise reinsert) a subrange.
3587 * - split destination inode's inline extents. The inline extents can
3588 * be either compressed or non-compressed.
3591 /* the destination must be opened for writing */
3592 if (!(file
->f_mode
& FMODE_WRITE
) || (file
->f_flags
& O_APPEND
))
3595 if (btrfs_root_readonly(root
))
3598 ret
= mnt_want_write_file(file
);
3602 src_file
= fdget(srcfd
);
3603 if (!src_file
.file
) {
3605 goto out_drop_write
;
3609 if (src_file
.file
->f_path
.mnt
!= file
->f_path
.mnt
)
3612 src
= file_inode(src_file
.file
);
3618 /* the src must be open for reading */
3619 if (!(src_file
.file
->f_mode
& FMODE_READ
))
3622 /* don't make the dst file partly checksummed */
3623 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3624 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
))
3628 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
3632 if (src
->i_sb
!= inode
->i_sb
)
3637 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_PARENT
);
3638 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_CHILD
);
3640 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_PARENT
);
3641 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_CHILD
);
3644 mutex_lock(&src
->i_mutex
);
3647 /* determine range to clone */
3649 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
3652 olen
= len
= src
->i_size
- off
;
3653 /* if we extend to eof, continue to block boundary */
3654 if (off
+ len
== src
->i_size
)
3655 len
= ALIGN(src
->i_size
, bs
) - off
;
3657 /* verify the end result is block aligned */
3658 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
3659 !IS_ALIGNED(destoff
, bs
))
3662 /* verify if ranges are overlapped within the same file */
3664 if (destoff
+ len
> off
&& destoff
< off
+ len
)
3668 if (destoff
> inode
->i_size
) {
3669 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
3675 * Lock the target range too. Right after we replace the file extent
3676 * items in the fs tree (which now point to the cloned data), we might
3677 * have a worker replace them with extent items relative to a write
3678 * operation that was issued before this clone operation (i.e. confront
3679 * with inode.c:btrfs_finish_ordered_io).
3682 u64 lock_start
= min_t(u64
, off
, destoff
);
3683 u64 lock_len
= max_t(u64
, off
, destoff
) + len
- lock_start
;
3685 lock_extent_range(src
, lock_start
, lock_len
);
3687 lock_extent_range(src
, off
, len
);
3688 lock_extent_range(inode
, destoff
, len
);
3691 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
);
3694 u64 lock_start
= min_t(u64
, off
, destoff
);
3695 u64 lock_end
= max_t(u64
, off
, destoff
) + len
- 1;
3697 unlock_extent(&BTRFS_I(src
)->io_tree
, lock_start
, lock_end
);
3699 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+ len
- 1);
3700 unlock_extent(&BTRFS_I(inode
)->io_tree
, destoff
,
3704 * Truncate page cache pages so that future reads will see the cloned
3705 * data immediately and not the previous data.
3707 truncate_inode_pages_range(&inode
->i_data
, destoff
,
3708 PAGE_CACHE_ALIGN(destoff
+ len
) - 1);
3712 mutex_unlock(&src
->i_mutex
);
3713 mutex_unlock(&inode
->i_mutex
);
3715 mutex_unlock(&inode
->i_mutex
);
3716 mutex_unlock(&src
->i_mutex
);
3719 mutex_unlock(&src
->i_mutex
);
3724 mnt_drop_write_file(file
);
3728 static long btrfs_ioctl_clone_range(struct file
*file
, void __user
*argp
)
3730 struct btrfs_ioctl_clone_range_args args
;
3732 if (copy_from_user(&args
, argp
, sizeof(args
)))
3734 return btrfs_ioctl_clone(file
, args
.src_fd
, args
.src_offset
,
3735 args
.src_length
, args
.dest_offset
);
3739 * there are many ways the trans_start and trans_end ioctls can lead
3740 * to deadlocks. They should only be used by applications that
3741 * basically own the machine, and have a very in depth understanding
3742 * of all the possible deadlocks and enospc problems.
3744 static long btrfs_ioctl_trans_start(struct file
*file
)
3746 struct inode
*inode
= file_inode(file
);
3747 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3748 struct btrfs_trans_handle
*trans
;
3752 if (!capable(CAP_SYS_ADMIN
))
3756 if (file
->private_data
)
3760 if (btrfs_root_readonly(root
))
3763 ret
= mnt_want_write_file(file
);
3767 atomic_inc(&root
->fs_info
->open_ioctl_trans
);
3770 trans
= btrfs_start_ioctl_transaction(root
);
3774 file
->private_data
= trans
;
3778 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3779 mnt_drop_write_file(file
);
3784 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3786 struct inode
*inode
= file_inode(file
);
3787 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3788 struct btrfs_root
*new_root
;
3789 struct btrfs_dir_item
*di
;
3790 struct btrfs_trans_handle
*trans
;
3791 struct btrfs_path
*path
;
3792 struct btrfs_key location
;
3793 struct btrfs_disk_key disk_key
;
3798 if (!capable(CAP_SYS_ADMIN
))
3801 ret
= mnt_want_write_file(file
);
3805 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3811 objectid
= BTRFS_FS_TREE_OBJECTID
;
3813 location
.objectid
= objectid
;
3814 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3815 location
.offset
= (u64
)-1;
3817 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
3818 if (IS_ERR(new_root
)) {
3819 ret
= PTR_ERR(new_root
);
3823 path
= btrfs_alloc_path();
3828 path
->leave_spinning
= 1;
3830 trans
= btrfs_start_transaction(root
, 1);
3831 if (IS_ERR(trans
)) {
3832 btrfs_free_path(path
);
3833 ret
= PTR_ERR(trans
);
3837 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
3838 di
= btrfs_lookup_dir_item(trans
, root
->fs_info
->tree_root
, path
,
3839 dir_id
, "default", 7, 1);
3840 if (IS_ERR_OR_NULL(di
)) {
3841 btrfs_free_path(path
);
3842 btrfs_end_transaction(trans
, root
);
3843 btrfs_err(new_root
->fs_info
, "Umm, you don't have the default dir"
3844 "item, this isn't going to work");
3849 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3850 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3851 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3852 btrfs_free_path(path
);
3854 btrfs_set_fs_incompat(root
->fs_info
, DEFAULT_SUBVOL
);
3855 btrfs_end_transaction(trans
, root
);
3857 mnt_drop_write_file(file
);
3861 void btrfs_get_block_group_info(struct list_head
*groups_list
,
3862 struct btrfs_ioctl_space_info
*space
)
3864 struct btrfs_block_group_cache
*block_group
;
3866 space
->total_bytes
= 0;
3867 space
->used_bytes
= 0;
3869 list_for_each_entry(block_group
, groups_list
, list
) {
3870 space
->flags
= block_group
->flags
;
3871 space
->total_bytes
+= block_group
->key
.offset
;
3872 space
->used_bytes
+=
3873 btrfs_block_group_used(&block_group
->item
);
3877 static long btrfs_ioctl_space_info(struct btrfs_root
*root
, void __user
*arg
)
3879 struct btrfs_ioctl_space_args space_args
;
3880 struct btrfs_ioctl_space_info space
;
3881 struct btrfs_ioctl_space_info
*dest
;
3882 struct btrfs_ioctl_space_info
*dest_orig
;
3883 struct btrfs_ioctl_space_info __user
*user_dest
;
3884 struct btrfs_space_info
*info
;
3885 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3886 BTRFS_BLOCK_GROUP_SYSTEM
,
3887 BTRFS_BLOCK_GROUP_METADATA
,
3888 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3895 if (copy_from_user(&space_args
,
3896 (struct btrfs_ioctl_space_args __user
*)arg
,
3897 sizeof(space_args
)))
3900 for (i
= 0; i
< num_types
; i
++) {
3901 struct btrfs_space_info
*tmp
;
3905 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3907 if (tmp
->flags
== types
[i
]) {
3917 down_read(&info
->groups_sem
);
3918 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3919 if (!list_empty(&info
->block_groups
[c
]))
3922 up_read(&info
->groups_sem
);
3926 * Global block reserve, exported as a space_info
3930 /* space_slots == 0 means they are asking for a count */
3931 if (space_args
.space_slots
== 0) {
3932 space_args
.total_spaces
= slot_count
;
3936 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
3938 alloc_size
= sizeof(*dest
) * slot_count
;
3940 /* we generally have at most 6 or so space infos, one for each raid
3941 * level. So, a whole page should be more than enough for everyone
3943 if (alloc_size
> PAGE_CACHE_SIZE
)
3946 space_args
.total_spaces
= 0;
3947 dest
= kmalloc(alloc_size
, GFP_NOFS
);
3952 /* now we have a buffer to copy into */
3953 for (i
= 0; i
< num_types
; i
++) {
3954 struct btrfs_space_info
*tmp
;
3961 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3963 if (tmp
->flags
== types
[i
]) {
3972 down_read(&info
->groups_sem
);
3973 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3974 if (!list_empty(&info
->block_groups
[c
])) {
3975 btrfs_get_block_group_info(
3976 &info
->block_groups
[c
], &space
);
3977 memcpy(dest
, &space
, sizeof(space
));
3979 space_args
.total_spaces
++;
3985 up_read(&info
->groups_sem
);
3989 * Add global block reserve
3992 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->global_block_rsv
;
3994 spin_lock(&block_rsv
->lock
);
3995 space
.total_bytes
= block_rsv
->size
;
3996 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
3997 spin_unlock(&block_rsv
->lock
);
3998 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
3999 memcpy(dest
, &space
, sizeof(space
));
4000 space_args
.total_spaces
++;
4003 user_dest
= (struct btrfs_ioctl_space_info __user
*)
4004 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
4006 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
4011 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
4018 * there are many ways the trans_start and trans_end ioctls can lead
4019 * to deadlocks. They should only be used by applications that
4020 * basically own the machine, and have a very in depth understanding
4021 * of all the possible deadlocks and enospc problems.
4023 long btrfs_ioctl_trans_end(struct file
*file
)
4025 struct inode
*inode
= file_inode(file
);
4026 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4027 struct btrfs_trans_handle
*trans
;
4029 trans
= file
->private_data
;
4032 file
->private_data
= NULL
;
4034 btrfs_end_transaction(trans
, root
);
4036 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
4038 mnt_drop_write_file(file
);
4042 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
4045 struct btrfs_trans_handle
*trans
;
4049 trans
= btrfs_attach_transaction_barrier(root
);
4050 if (IS_ERR(trans
)) {
4051 if (PTR_ERR(trans
) != -ENOENT
)
4052 return PTR_ERR(trans
);
4054 /* No running transaction, don't bother */
4055 transid
= root
->fs_info
->last_trans_committed
;
4058 transid
= trans
->transid
;
4059 ret
= btrfs_commit_transaction_async(trans
, root
, 0);
4061 btrfs_end_transaction(trans
, root
);
4066 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
4071 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_root
*root
,
4077 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
4080 transid
= 0; /* current trans */
4082 return btrfs_wait_for_commit(root
, transid
);
4085 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
4087 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4088 struct btrfs_ioctl_scrub_args
*sa
;
4091 if (!capable(CAP_SYS_ADMIN
))
4094 sa
= memdup_user(arg
, sizeof(*sa
));
4098 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
4099 ret
= mnt_want_write_file(file
);
4104 ret
= btrfs_scrub_dev(root
->fs_info
, sa
->devid
, sa
->start
, sa
->end
,
4105 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
4108 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4111 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
4112 mnt_drop_write_file(file
);
4118 static long btrfs_ioctl_scrub_cancel(struct btrfs_root
*root
, void __user
*arg
)
4120 if (!capable(CAP_SYS_ADMIN
))
4123 return btrfs_scrub_cancel(root
->fs_info
);
4126 static long btrfs_ioctl_scrub_progress(struct btrfs_root
*root
,
4129 struct btrfs_ioctl_scrub_args
*sa
;
4132 if (!capable(CAP_SYS_ADMIN
))
4135 sa
= memdup_user(arg
, sizeof(*sa
));
4139 ret
= btrfs_scrub_progress(root
, sa
->devid
, &sa
->progress
);
4141 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4148 static long btrfs_ioctl_get_dev_stats(struct btrfs_root
*root
,
4151 struct btrfs_ioctl_get_dev_stats
*sa
;
4154 sa
= memdup_user(arg
, sizeof(*sa
));
4158 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
4163 ret
= btrfs_get_dev_stats(root
, sa
);
4165 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4172 static long btrfs_ioctl_dev_replace(struct btrfs_root
*root
, void __user
*arg
)
4174 struct btrfs_ioctl_dev_replace_args
*p
;
4177 if (!capable(CAP_SYS_ADMIN
))
4180 p
= memdup_user(arg
, sizeof(*p
));
4185 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
4186 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
) {
4191 &root
->fs_info
->mutually_exclusive_operation_running
,
4193 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4195 ret
= btrfs_dev_replace_start(root
, p
);
4197 &root
->fs_info
->mutually_exclusive_operation_running
,
4201 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
4202 btrfs_dev_replace_status(root
->fs_info
, p
);
4205 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
4206 ret
= btrfs_dev_replace_cancel(root
->fs_info
, p
);
4213 if (copy_to_user(arg
, p
, sizeof(*p
)))
4220 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
4226 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
4227 struct inode_fs_paths
*ipath
= NULL
;
4228 struct btrfs_path
*path
;
4230 if (!capable(CAP_DAC_READ_SEARCH
))
4233 path
= btrfs_alloc_path();
4239 ipa
= memdup_user(arg
, sizeof(*ipa
));
4246 size
= min_t(u32
, ipa
->size
, 4096);
4247 ipath
= init_ipath(size
, root
, path
);
4248 if (IS_ERR(ipath
)) {
4249 ret
= PTR_ERR(ipath
);
4254 ret
= paths_from_inode(ipa
->inum
, ipath
);
4258 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
4259 rel_ptr
= ipath
->fspath
->val
[i
] -
4260 (u64
)(unsigned long)ipath
->fspath
->val
;
4261 ipath
->fspath
->val
[i
] = rel_ptr
;
4264 ret
= copy_to_user((void *)(unsigned long)ipa
->fspath
,
4265 (void *)(unsigned long)ipath
->fspath
, size
);
4272 btrfs_free_path(path
);
4279 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
4281 struct btrfs_data_container
*inodes
= ctx
;
4282 const size_t c
= 3 * sizeof(u64
);
4284 if (inodes
->bytes_left
>= c
) {
4285 inodes
->bytes_left
-= c
;
4286 inodes
->val
[inodes
->elem_cnt
] = inum
;
4287 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
4288 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
4289 inodes
->elem_cnt
+= 3;
4291 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
4292 inodes
->bytes_left
= 0;
4293 inodes
->elem_missed
+= 3;
4299 static long btrfs_ioctl_logical_to_ino(struct btrfs_root
*root
,
4304 struct btrfs_ioctl_logical_ino_args
*loi
;
4305 struct btrfs_data_container
*inodes
= NULL
;
4306 struct btrfs_path
*path
= NULL
;
4308 if (!capable(CAP_SYS_ADMIN
))
4311 loi
= memdup_user(arg
, sizeof(*loi
));
4318 path
= btrfs_alloc_path();
4324 size
= min_t(u32
, loi
->size
, 64 * 1024);
4325 inodes
= init_data_container(size
);
4326 if (IS_ERR(inodes
)) {
4327 ret
= PTR_ERR(inodes
);
4332 ret
= iterate_inodes_from_logical(loi
->logical
, root
->fs_info
, path
,
4333 build_ino_list
, inodes
);
4339 ret
= copy_to_user((void *)(unsigned long)loi
->inodes
,
4340 (void *)(unsigned long)inodes
, size
);
4345 btrfs_free_path(path
);
4352 void update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
, int lock
,
4353 struct btrfs_ioctl_balance_args
*bargs
)
4355 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4357 bargs
->flags
= bctl
->flags
;
4359 if (atomic_read(&fs_info
->balance_running
))
4360 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
4361 if (atomic_read(&fs_info
->balance_pause_req
))
4362 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
4363 if (atomic_read(&fs_info
->balance_cancel_req
))
4364 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
4366 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
4367 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
4368 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
4371 spin_lock(&fs_info
->balance_lock
);
4372 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4373 spin_unlock(&fs_info
->balance_lock
);
4375 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4379 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
4381 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4382 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4383 struct btrfs_ioctl_balance_args
*bargs
;
4384 struct btrfs_balance_control
*bctl
;
4385 bool need_unlock
; /* for mut. excl. ops lock */
4388 if (!capable(CAP_SYS_ADMIN
))
4391 ret
= mnt_want_write_file(file
);
4396 if (!atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
4397 mutex_lock(&fs_info
->volume_mutex
);
4398 mutex_lock(&fs_info
->balance_mutex
);
4404 * mut. excl. ops lock is locked. Three possibilites:
4405 * (1) some other op is running
4406 * (2) balance is running
4407 * (3) balance is paused -- special case (think resume)
4409 mutex_lock(&fs_info
->balance_mutex
);
4410 if (fs_info
->balance_ctl
) {
4411 /* this is either (2) or (3) */
4412 if (!atomic_read(&fs_info
->balance_running
)) {
4413 mutex_unlock(&fs_info
->balance_mutex
);
4414 if (!mutex_trylock(&fs_info
->volume_mutex
))
4416 mutex_lock(&fs_info
->balance_mutex
);
4418 if (fs_info
->balance_ctl
&&
4419 !atomic_read(&fs_info
->balance_running
)) {
4421 need_unlock
= false;
4425 mutex_unlock(&fs_info
->balance_mutex
);
4426 mutex_unlock(&fs_info
->volume_mutex
);
4430 mutex_unlock(&fs_info
->balance_mutex
);
4436 mutex_unlock(&fs_info
->balance_mutex
);
4437 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4442 BUG_ON(!atomic_read(&fs_info
->mutually_exclusive_operation_running
));
4445 bargs
= memdup_user(arg
, sizeof(*bargs
));
4446 if (IS_ERR(bargs
)) {
4447 ret
= PTR_ERR(bargs
);
4451 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
4452 if (!fs_info
->balance_ctl
) {
4457 bctl
= fs_info
->balance_ctl
;
4458 spin_lock(&fs_info
->balance_lock
);
4459 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4460 spin_unlock(&fs_info
->balance_lock
);
4468 if (fs_info
->balance_ctl
) {
4473 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
4479 bctl
->fs_info
= fs_info
;
4481 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4482 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4483 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4485 bctl
->flags
= bargs
->flags
;
4487 /* balance everything - no filters */
4488 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4493 * Ownership of bctl and mutually_exclusive_operation_running
4494 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4495 * or, if restriper was paused all the way until unmount, in
4496 * free_fs_info. mutually_exclusive_operation_running is
4497 * cleared in __cancel_balance.
4499 need_unlock
= false;
4501 ret
= btrfs_balance(bctl
, bargs
);
4504 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4511 mutex_unlock(&fs_info
->balance_mutex
);
4512 mutex_unlock(&fs_info
->volume_mutex
);
4514 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
4516 mnt_drop_write_file(file
);
4520 static long btrfs_ioctl_balance_ctl(struct btrfs_root
*root
, int cmd
)
4522 if (!capable(CAP_SYS_ADMIN
))
4526 case BTRFS_BALANCE_CTL_PAUSE
:
4527 return btrfs_pause_balance(root
->fs_info
);
4528 case BTRFS_BALANCE_CTL_CANCEL
:
4529 return btrfs_cancel_balance(root
->fs_info
);
4535 static long btrfs_ioctl_balance_progress(struct btrfs_root
*root
,
4538 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4539 struct btrfs_ioctl_balance_args
*bargs
;
4542 if (!capable(CAP_SYS_ADMIN
))
4545 mutex_lock(&fs_info
->balance_mutex
);
4546 if (!fs_info
->balance_ctl
) {
4551 bargs
= kzalloc(sizeof(*bargs
), GFP_NOFS
);
4557 update_ioctl_balance_args(fs_info
, 1, bargs
);
4559 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4564 mutex_unlock(&fs_info
->balance_mutex
);
4568 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4570 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4571 struct btrfs_ioctl_quota_ctl_args
*sa
;
4572 struct btrfs_trans_handle
*trans
= NULL
;
4576 if (!capable(CAP_SYS_ADMIN
))
4579 ret
= mnt_want_write_file(file
);
4583 sa
= memdup_user(arg
, sizeof(*sa
));
4589 down_write(&root
->fs_info
->subvol_sem
);
4590 trans
= btrfs_start_transaction(root
->fs_info
->tree_root
, 2);
4591 if (IS_ERR(trans
)) {
4592 ret
= PTR_ERR(trans
);
4597 case BTRFS_QUOTA_CTL_ENABLE
:
4598 ret
= btrfs_quota_enable(trans
, root
->fs_info
);
4600 case BTRFS_QUOTA_CTL_DISABLE
:
4601 ret
= btrfs_quota_disable(trans
, root
->fs_info
);
4608 err
= btrfs_commit_transaction(trans
, root
->fs_info
->tree_root
);
4613 up_write(&root
->fs_info
->subvol_sem
);
4615 mnt_drop_write_file(file
);
4619 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4621 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4622 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4623 struct btrfs_trans_handle
*trans
;
4627 if (!capable(CAP_SYS_ADMIN
))
4630 ret
= mnt_want_write_file(file
);
4634 sa
= memdup_user(arg
, sizeof(*sa
));
4640 trans
= btrfs_join_transaction(root
);
4641 if (IS_ERR(trans
)) {
4642 ret
= PTR_ERR(trans
);
4646 /* FIXME: check if the IDs really exist */
4648 ret
= btrfs_add_qgroup_relation(trans
, root
->fs_info
,
4651 ret
= btrfs_del_qgroup_relation(trans
, root
->fs_info
,
4655 err
= btrfs_end_transaction(trans
, root
);
4662 mnt_drop_write_file(file
);
4666 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4668 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4669 struct btrfs_ioctl_qgroup_create_args
*sa
;
4670 struct btrfs_trans_handle
*trans
;
4674 if (!capable(CAP_SYS_ADMIN
))
4677 ret
= mnt_want_write_file(file
);
4681 sa
= memdup_user(arg
, sizeof(*sa
));
4687 if (!sa
->qgroupid
) {
4692 trans
= btrfs_join_transaction(root
);
4693 if (IS_ERR(trans
)) {
4694 ret
= PTR_ERR(trans
);
4698 /* FIXME: check if the IDs really exist */
4700 ret
= btrfs_create_qgroup(trans
, root
->fs_info
, sa
->qgroupid
,
4703 ret
= btrfs_remove_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4706 err
= btrfs_end_transaction(trans
, root
);
4713 mnt_drop_write_file(file
);
4717 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4719 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4720 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4721 struct btrfs_trans_handle
*trans
;
4726 if (!capable(CAP_SYS_ADMIN
))
4729 ret
= mnt_want_write_file(file
);
4733 sa
= memdup_user(arg
, sizeof(*sa
));
4739 trans
= btrfs_join_transaction(root
);
4740 if (IS_ERR(trans
)) {
4741 ret
= PTR_ERR(trans
);
4745 qgroupid
= sa
->qgroupid
;
4747 /* take the current subvol as qgroup */
4748 qgroupid
= root
->root_key
.objectid
;
4751 /* FIXME: check if the IDs really exist */
4752 ret
= btrfs_limit_qgroup(trans
, root
->fs_info
, qgroupid
, &sa
->lim
);
4754 err
= btrfs_end_transaction(trans
, root
);
4761 mnt_drop_write_file(file
);
4765 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4767 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4768 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4771 if (!capable(CAP_SYS_ADMIN
))
4774 ret
= mnt_want_write_file(file
);
4778 qsa
= memdup_user(arg
, sizeof(*qsa
));
4789 ret
= btrfs_qgroup_rescan(root
->fs_info
);
4794 mnt_drop_write_file(file
);
4798 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
4800 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4801 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4804 if (!capable(CAP_SYS_ADMIN
))
4807 qsa
= kzalloc(sizeof(*qsa
), GFP_NOFS
);
4811 if (root
->fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4813 qsa
->progress
= root
->fs_info
->qgroup_rescan_progress
.objectid
;
4816 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
4823 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
4825 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4827 if (!capable(CAP_SYS_ADMIN
))
4830 return btrfs_qgroup_wait_for_completion(root
->fs_info
);
4833 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
4834 struct btrfs_ioctl_received_subvol_args
*sa
)
4836 struct inode
*inode
= file_inode(file
);
4837 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4838 struct btrfs_root_item
*root_item
= &root
->root_item
;
4839 struct btrfs_trans_handle
*trans
;
4840 struct timespec ct
= CURRENT_TIME
;
4842 int received_uuid_changed
;
4844 if (!inode_owner_or_capable(inode
))
4847 ret
= mnt_want_write_file(file
);
4851 down_write(&root
->fs_info
->subvol_sem
);
4853 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
4858 if (btrfs_root_readonly(root
)) {
4865 * 2 - uuid items (received uuid + subvol uuid)
4867 trans
= btrfs_start_transaction(root
, 3);
4868 if (IS_ERR(trans
)) {
4869 ret
= PTR_ERR(trans
);
4874 sa
->rtransid
= trans
->transid
;
4875 sa
->rtime
.sec
= ct
.tv_sec
;
4876 sa
->rtime
.nsec
= ct
.tv_nsec
;
4878 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4880 if (received_uuid_changed
&&
4881 !btrfs_is_empty_uuid(root_item
->received_uuid
))
4882 btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
4883 root_item
->received_uuid
,
4884 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4885 root
->root_key
.objectid
);
4886 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4887 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4888 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4889 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4890 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4891 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4892 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
4894 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
4895 &root
->root_key
, &root
->root_item
);
4897 btrfs_end_transaction(trans
, root
);
4900 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
4901 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
4903 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4904 root
->root_key
.objectid
);
4905 if (ret
< 0 && ret
!= -EEXIST
) {
4906 btrfs_abort_transaction(trans
, root
, ret
);
4910 ret
= btrfs_commit_transaction(trans
, root
);
4912 btrfs_abort_transaction(trans
, root
, ret
);
4917 up_write(&root
->fs_info
->subvol_sem
);
4918 mnt_drop_write_file(file
);
4923 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
4926 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
4927 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
4930 args32
= memdup_user(arg
, sizeof(*args32
));
4931 if (IS_ERR(args32
)) {
4932 ret
= PTR_ERR(args32
);
4937 args64
= kmalloc(sizeof(*args64
), GFP_NOFS
);
4943 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
4944 args64
->stransid
= args32
->stransid
;
4945 args64
->rtransid
= args32
->rtransid
;
4946 args64
->stime
.sec
= args32
->stime
.sec
;
4947 args64
->stime
.nsec
= args32
->stime
.nsec
;
4948 args64
->rtime
.sec
= args32
->rtime
.sec
;
4949 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
4950 args64
->flags
= args32
->flags
;
4952 ret
= _btrfs_ioctl_set_received_subvol(file
, args64
);
4956 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
4957 args32
->stransid
= args64
->stransid
;
4958 args32
->rtransid
= args64
->rtransid
;
4959 args32
->stime
.sec
= args64
->stime
.sec
;
4960 args32
->stime
.nsec
= args64
->stime
.nsec
;
4961 args32
->rtime
.sec
= args64
->rtime
.sec
;
4962 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
4963 args32
->flags
= args64
->flags
;
4965 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
4976 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
4979 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
4982 sa
= memdup_user(arg
, sizeof(*sa
));
4989 ret
= _btrfs_ioctl_set_received_subvol(file
, sa
);
4994 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
5003 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
5005 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5008 char label
[BTRFS_LABEL_SIZE
];
5010 spin_lock(&root
->fs_info
->super_lock
);
5011 memcpy(label
, root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
5012 spin_unlock(&root
->fs_info
->super_lock
);
5014 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
5016 if (len
== BTRFS_LABEL_SIZE
) {
5017 btrfs_warn(root
->fs_info
,
5018 "label is too long, return the first %zu bytes", --len
);
5021 ret
= copy_to_user(arg
, label
, len
);
5023 return ret
? -EFAULT
: 0;
5026 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
5028 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5029 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5030 struct btrfs_trans_handle
*trans
;
5031 char label
[BTRFS_LABEL_SIZE
];
5034 if (!capable(CAP_SYS_ADMIN
))
5037 if (copy_from_user(label
, arg
, sizeof(label
)))
5040 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
5041 btrfs_err(root
->fs_info
, "unable to set label with more than %d bytes",
5042 BTRFS_LABEL_SIZE
- 1);
5046 ret
= mnt_want_write_file(file
);
5050 trans
= btrfs_start_transaction(root
, 0);
5051 if (IS_ERR(trans
)) {
5052 ret
= PTR_ERR(trans
);
5056 spin_lock(&root
->fs_info
->super_lock
);
5057 strcpy(super_block
->label
, label
);
5058 spin_unlock(&root
->fs_info
->super_lock
);
5059 ret
= btrfs_commit_transaction(trans
, root
);
5062 mnt_drop_write_file(file
);
5066 #define INIT_FEATURE_FLAGS(suffix) \
5067 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5068 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5069 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5071 static int btrfs_ioctl_get_supported_features(struct file
*file
,
5074 static struct btrfs_ioctl_feature_flags features
[3] = {
5075 INIT_FEATURE_FLAGS(SUPP
),
5076 INIT_FEATURE_FLAGS(SAFE_SET
),
5077 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
5080 if (copy_to_user(arg
, &features
, sizeof(features
)))
5086 static int btrfs_ioctl_get_features(struct file
*file
, void __user
*arg
)
5088 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5089 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5090 struct btrfs_ioctl_feature_flags features
;
5092 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
5093 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
5094 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
5096 if (copy_to_user(arg
, &features
, sizeof(features
)))
5102 static int check_feature_bits(struct btrfs_root
*root
,
5103 enum btrfs_feature_set set
,
5104 u64 change_mask
, u64 flags
, u64 supported_flags
,
5105 u64 safe_set
, u64 safe_clear
)
5107 const char *type
= btrfs_feature_set_names
[set
];
5109 u64 disallowed
, unsupported
;
5110 u64 set_mask
= flags
& change_mask
;
5111 u64 clear_mask
= ~flags
& change_mask
;
5113 unsupported
= set_mask
& ~supported_flags
;
5115 names
= btrfs_printable_features(set
, unsupported
);
5117 btrfs_warn(root
->fs_info
,
5118 "this kernel does not support the %s feature bit%s",
5119 names
, strchr(names
, ',') ? "s" : "");
5122 btrfs_warn(root
->fs_info
,
5123 "this kernel does not support %s bits 0x%llx",
5128 disallowed
= set_mask
& ~safe_set
;
5130 names
= btrfs_printable_features(set
, disallowed
);
5132 btrfs_warn(root
->fs_info
,
5133 "can't set the %s feature bit%s while mounted",
5134 names
, strchr(names
, ',') ? "s" : "");
5137 btrfs_warn(root
->fs_info
,
5138 "can't set %s bits 0x%llx while mounted",
5143 disallowed
= clear_mask
& ~safe_clear
;
5145 names
= btrfs_printable_features(set
, disallowed
);
5147 btrfs_warn(root
->fs_info
,
5148 "can't clear the %s feature bit%s while mounted",
5149 names
, strchr(names
, ',') ? "s" : "");
5152 btrfs_warn(root
->fs_info
,
5153 "can't clear %s bits 0x%llx while mounted",
5161 #define check_feature(root, change_mask, flags, mask_base) \
5162 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5163 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5164 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5165 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5167 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
5169 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5170 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5171 struct btrfs_ioctl_feature_flags flags
[2];
5172 struct btrfs_trans_handle
*trans
;
5176 if (!capable(CAP_SYS_ADMIN
))
5179 if (copy_from_user(flags
, arg
, sizeof(flags
)))
5183 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
5184 !flags
[0].incompat_flags
)
5187 ret
= check_feature(root
, flags
[0].compat_flags
,
5188 flags
[1].compat_flags
, COMPAT
);
5192 ret
= check_feature(root
, flags
[0].compat_ro_flags
,
5193 flags
[1].compat_ro_flags
, COMPAT_RO
);
5197 ret
= check_feature(root
, flags
[0].incompat_flags
,
5198 flags
[1].incompat_flags
, INCOMPAT
);
5202 trans
= btrfs_start_transaction(root
, 0);
5204 return PTR_ERR(trans
);
5206 spin_lock(&root
->fs_info
->super_lock
);
5207 newflags
= btrfs_super_compat_flags(super_block
);
5208 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
5209 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
5210 btrfs_set_super_compat_flags(super_block
, newflags
);
5212 newflags
= btrfs_super_compat_ro_flags(super_block
);
5213 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
5214 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
5215 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
5217 newflags
= btrfs_super_incompat_flags(super_block
);
5218 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
5219 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
5220 btrfs_set_super_incompat_flags(super_block
, newflags
);
5221 spin_unlock(&root
->fs_info
->super_lock
);
5223 return btrfs_commit_transaction(trans
, root
);
5226 long btrfs_ioctl(struct file
*file
, unsigned int
5227 cmd
, unsigned long arg
)
5229 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5230 void __user
*argp
= (void __user
*)arg
;
5233 case FS_IOC_GETFLAGS
:
5234 return btrfs_ioctl_getflags(file
, argp
);
5235 case FS_IOC_SETFLAGS
:
5236 return btrfs_ioctl_setflags(file
, argp
);
5237 case FS_IOC_GETVERSION
:
5238 return btrfs_ioctl_getversion(file
, argp
);
5240 return btrfs_ioctl_fitrim(file
, argp
);
5241 case BTRFS_IOC_SNAP_CREATE
:
5242 return btrfs_ioctl_snap_create(file
, argp
, 0);
5243 case BTRFS_IOC_SNAP_CREATE_V2
:
5244 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
5245 case BTRFS_IOC_SUBVOL_CREATE
:
5246 return btrfs_ioctl_snap_create(file
, argp
, 1);
5247 case BTRFS_IOC_SUBVOL_CREATE_V2
:
5248 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
5249 case BTRFS_IOC_SNAP_DESTROY
:
5250 return btrfs_ioctl_snap_destroy(file
, argp
);
5251 case BTRFS_IOC_SUBVOL_GETFLAGS
:
5252 return btrfs_ioctl_subvol_getflags(file
, argp
);
5253 case BTRFS_IOC_SUBVOL_SETFLAGS
:
5254 return btrfs_ioctl_subvol_setflags(file
, argp
);
5255 case BTRFS_IOC_DEFAULT_SUBVOL
:
5256 return btrfs_ioctl_default_subvol(file
, argp
);
5257 case BTRFS_IOC_DEFRAG
:
5258 return btrfs_ioctl_defrag(file
, NULL
);
5259 case BTRFS_IOC_DEFRAG_RANGE
:
5260 return btrfs_ioctl_defrag(file
, argp
);
5261 case BTRFS_IOC_RESIZE
:
5262 return btrfs_ioctl_resize(file
, argp
);
5263 case BTRFS_IOC_ADD_DEV
:
5264 return btrfs_ioctl_add_dev(root
, argp
);
5265 case BTRFS_IOC_RM_DEV
:
5266 return btrfs_ioctl_rm_dev(file
, argp
);
5267 case BTRFS_IOC_FS_INFO
:
5268 return btrfs_ioctl_fs_info(root
, argp
);
5269 case BTRFS_IOC_DEV_INFO
:
5270 return btrfs_ioctl_dev_info(root
, argp
);
5271 case BTRFS_IOC_BALANCE
:
5272 return btrfs_ioctl_balance(file
, NULL
);
5273 case BTRFS_IOC_CLONE
:
5274 return btrfs_ioctl_clone(file
, arg
, 0, 0, 0);
5275 case BTRFS_IOC_CLONE_RANGE
:
5276 return btrfs_ioctl_clone_range(file
, argp
);
5277 case BTRFS_IOC_TRANS_START
:
5278 return btrfs_ioctl_trans_start(file
);
5279 case BTRFS_IOC_TRANS_END
:
5280 return btrfs_ioctl_trans_end(file
);
5281 case BTRFS_IOC_TREE_SEARCH
:
5282 return btrfs_ioctl_tree_search(file
, argp
);
5283 case BTRFS_IOC_TREE_SEARCH_V2
:
5284 return btrfs_ioctl_tree_search_v2(file
, argp
);
5285 case BTRFS_IOC_INO_LOOKUP
:
5286 return btrfs_ioctl_ino_lookup(file
, argp
);
5287 case BTRFS_IOC_INO_PATHS
:
5288 return btrfs_ioctl_ino_to_path(root
, argp
);
5289 case BTRFS_IOC_LOGICAL_INO
:
5290 return btrfs_ioctl_logical_to_ino(root
, argp
);
5291 case BTRFS_IOC_SPACE_INFO
:
5292 return btrfs_ioctl_space_info(root
, argp
);
5293 case BTRFS_IOC_SYNC
: {
5296 ret
= btrfs_start_delalloc_roots(root
->fs_info
, 0, -1);
5299 ret
= btrfs_sync_fs(file
->f_dentry
->d_sb
, 1);
5301 * The transaction thread may want to do more work,
5302 * namely it pokes the cleaner ktread that will start
5303 * processing uncleaned subvols.
5305 wake_up_process(root
->fs_info
->transaction_kthread
);
5308 case BTRFS_IOC_START_SYNC
:
5309 return btrfs_ioctl_start_sync(root
, argp
);
5310 case BTRFS_IOC_WAIT_SYNC
:
5311 return btrfs_ioctl_wait_sync(root
, argp
);
5312 case BTRFS_IOC_SCRUB
:
5313 return btrfs_ioctl_scrub(file
, argp
);
5314 case BTRFS_IOC_SCRUB_CANCEL
:
5315 return btrfs_ioctl_scrub_cancel(root
, argp
);
5316 case BTRFS_IOC_SCRUB_PROGRESS
:
5317 return btrfs_ioctl_scrub_progress(root
, argp
);
5318 case BTRFS_IOC_BALANCE_V2
:
5319 return btrfs_ioctl_balance(file
, argp
);
5320 case BTRFS_IOC_BALANCE_CTL
:
5321 return btrfs_ioctl_balance_ctl(root
, arg
);
5322 case BTRFS_IOC_BALANCE_PROGRESS
:
5323 return btrfs_ioctl_balance_progress(root
, argp
);
5324 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
5325 return btrfs_ioctl_set_received_subvol(file
, argp
);
5327 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
5328 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
5330 case BTRFS_IOC_SEND
:
5331 return btrfs_ioctl_send(file
, argp
);
5332 case BTRFS_IOC_GET_DEV_STATS
:
5333 return btrfs_ioctl_get_dev_stats(root
, argp
);
5334 case BTRFS_IOC_QUOTA_CTL
:
5335 return btrfs_ioctl_quota_ctl(file
, argp
);
5336 case BTRFS_IOC_QGROUP_ASSIGN
:
5337 return btrfs_ioctl_qgroup_assign(file
, argp
);
5338 case BTRFS_IOC_QGROUP_CREATE
:
5339 return btrfs_ioctl_qgroup_create(file
, argp
);
5340 case BTRFS_IOC_QGROUP_LIMIT
:
5341 return btrfs_ioctl_qgroup_limit(file
, argp
);
5342 case BTRFS_IOC_QUOTA_RESCAN
:
5343 return btrfs_ioctl_quota_rescan(file
, argp
);
5344 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
5345 return btrfs_ioctl_quota_rescan_status(file
, argp
);
5346 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
5347 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
5348 case BTRFS_IOC_DEV_REPLACE
:
5349 return btrfs_ioctl_dev_replace(root
, argp
);
5350 case BTRFS_IOC_GET_FSLABEL
:
5351 return btrfs_ioctl_get_fslabel(file
, argp
);
5352 case BTRFS_IOC_SET_FSLABEL
:
5353 return btrfs_ioctl_set_fslabel(file
, argp
);
5354 case BTRFS_IOC_FILE_EXTENT_SAME
:
5355 return btrfs_ioctl_file_extent_same(file
, argp
);
5356 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
5357 return btrfs_ioctl_get_supported_features(file
, argp
);
5358 case BTRFS_IOC_GET_FEATURES
:
5359 return btrfs_ioctl_get_features(file
, argp
);
5360 case BTRFS_IOC_SET_FEATURES
:
5361 return btrfs_ioctl_set_features(file
, argp
);