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
);
460 * Don't create subvolume whose level is not zero. Or qgroup will be
461 * screwed up since it assume subvolme qgroup's level to be 0.
463 if (btrfs_qgroup_level(objectid
))
466 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
468 * The same as the snapshot creation, please see the comment
469 * of create_snapshot().
471 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
472 8, &qgroup_reserved
, false);
476 trans
= btrfs_start_transaction(root
, 0);
478 ret
= PTR_ERR(trans
);
479 btrfs_subvolume_release_metadata(root
, &block_rsv
,
483 trans
->block_rsv
= &block_rsv
;
484 trans
->bytes_reserved
= block_rsv
.size
;
486 ret
= btrfs_qgroup_inherit(trans
, root
->fs_info
, 0, objectid
, inherit
);
490 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
496 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
497 btrfs_set_header_bytenr(leaf
, leaf
->start
);
498 btrfs_set_header_generation(leaf
, trans
->transid
);
499 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
500 btrfs_set_header_owner(leaf
, objectid
);
502 write_extent_buffer(leaf
, root
->fs_info
->fsid
, btrfs_header_fsid(),
504 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
505 btrfs_header_chunk_tree_uuid(leaf
),
507 btrfs_mark_buffer_dirty(leaf
);
509 memset(&root_item
, 0, sizeof(root_item
));
511 inode_item
= &root_item
.inode
;
512 btrfs_set_stack_inode_generation(inode_item
, 1);
513 btrfs_set_stack_inode_size(inode_item
, 3);
514 btrfs_set_stack_inode_nlink(inode_item
, 1);
515 btrfs_set_stack_inode_nbytes(inode_item
, root
->nodesize
);
516 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
518 btrfs_set_root_flags(&root_item
, 0);
519 btrfs_set_root_limit(&root_item
, 0);
520 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
522 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
523 btrfs_set_root_generation(&root_item
, trans
->transid
);
524 btrfs_set_root_level(&root_item
, 0);
525 btrfs_set_root_refs(&root_item
, 1);
526 btrfs_set_root_used(&root_item
, leaf
->len
);
527 btrfs_set_root_last_snapshot(&root_item
, 0);
529 btrfs_set_root_generation_v2(&root_item
,
530 btrfs_root_generation(&root_item
));
531 uuid_le_gen(&new_uuid
);
532 memcpy(root_item
.uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
533 btrfs_set_stack_timespec_sec(&root_item
.otime
, cur_time
.tv_sec
);
534 btrfs_set_stack_timespec_nsec(&root_item
.otime
, cur_time
.tv_nsec
);
535 root_item
.ctime
= root_item
.otime
;
536 btrfs_set_root_ctransid(&root_item
, trans
->transid
);
537 btrfs_set_root_otransid(&root_item
, trans
->transid
);
539 btrfs_tree_unlock(leaf
);
540 free_extent_buffer(leaf
);
543 btrfs_set_root_dirid(&root_item
, new_dirid
);
545 key
.objectid
= objectid
;
547 key
.type
= BTRFS_ROOT_ITEM_KEY
;
548 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
553 key
.offset
= (u64
)-1;
554 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
555 if (IS_ERR(new_root
)) {
556 btrfs_abort_transaction(trans
, root
, PTR_ERR(new_root
));
557 ret
= PTR_ERR(new_root
);
561 btrfs_record_root_in_trans(trans
, new_root
);
563 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, new_dirid
);
565 /* We potentially lose an unused inode item here */
566 btrfs_abort_transaction(trans
, root
, ret
);
571 * insert the directory item
573 ret
= btrfs_set_inode_index(dir
, &index
);
575 btrfs_abort_transaction(trans
, root
, ret
);
579 ret
= btrfs_insert_dir_item(trans
, root
,
580 name
, namelen
, dir
, &key
,
581 BTRFS_FT_DIR
, index
);
583 btrfs_abort_transaction(trans
, root
, ret
);
587 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
588 ret
= btrfs_update_inode(trans
, root
, dir
);
591 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
592 objectid
, root
->root_key
.objectid
,
593 btrfs_ino(dir
), index
, name
, namelen
);
596 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
597 root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
600 btrfs_abort_transaction(trans
, root
, ret
);
603 trans
->block_rsv
= NULL
;
604 trans
->bytes_reserved
= 0;
605 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
608 *async_transid
= trans
->transid
;
609 err
= btrfs_commit_transaction_async(trans
, root
, 1);
611 err
= btrfs_commit_transaction(trans
, root
);
613 err
= btrfs_commit_transaction(trans
, root
);
619 inode
= btrfs_lookup_dentry(dir
, dentry
);
621 return PTR_ERR(inode
);
622 d_instantiate(dentry
, inode
);
627 static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root
*root
)
633 prepare_to_wait(&root
->subv_writers
->wait
, &wait
,
634 TASK_UNINTERRUPTIBLE
);
636 writers
= percpu_counter_sum(&root
->subv_writers
->counter
);
640 finish_wait(&root
->subv_writers
->wait
, &wait
);
644 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
645 struct dentry
*dentry
, char *name
, int namelen
,
646 u64
*async_transid
, bool readonly
,
647 struct btrfs_qgroup_inherit
*inherit
)
650 struct btrfs_pending_snapshot
*pending_snapshot
;
651 struct btrfs_trans_handle
*trans
;
654 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
657 atomic_inc(&root
->will_be_snapshoted
);
658 smp_mb__after_atomic();
659 btrfs_wait_for_no_snapshoting_writes(root
);
661 ret
= btrfs_start_delalloc_inodes(root
, 0);
665 btrfs_wait_ordered_extents(root
, -1);
667 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
668 if (!pending_snapshot
) {
673 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
674 BTRFS_BLOCK_RSV_TEMP
);
676 * 1 - parent dir inode
679 * 2 - root ref/backref
680 * 1 - root of snapshot
683 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
684 &pending_snapshot
->block_rsv
, 8,
685 &pending_snapshot
->qgroup_reserved
,
690 pending_snapshot
->dentry
= dentry
;
691 pending_snapshot
->root
= root
;
692 pending_snapshot
->readonly
= readonly
;
693 pending_snapshot
->dir
= dir
;
694 pending_snapshot
->inherit
= inherit
;
696 trans
= btrfs_start_transaction(root
, 0);
698 ret
= PTR_ERR(trans
);
702 spin_lock(&root
->fs_info
->trans_lock
);
703 list_add(&pending_snapshot
->list
,
704 &trans
->transaction
->pending_snapshots
);
705 spin_unlock(&root
->fs_info
->trans_lock
);
707 *async_transid
= trans
->transid
;
708 ret
= btrfs_commit_transaction_async(trans
,
709 root
->fs_info
->extent_root
, 1);
711 ret
= btrfs_commit_transaction(trans
, root
);
713 ret
= btrfs_commit_transaction(trans
,
714 root
->fs_info
->extent_root
);
719 ret
= pending_snapshot
->error
;
723 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
727 inode
= btrfs_lookup_dentry(d_inode(dentry
->d_parent
), dentry
);
729 ret
= PTR_ERR(inode
);
733 d_instantiate(dentry
, inode
);
736 btrfs_subvolume_release_metadata(BTRFS_I(dir
)->root
,
737 &pending_snapshot
->block_rsv
,
738 pending_snapshot
->qgroup_reserved
);
740 kfree(pending_snapshot
);
742 if (atomic_dec_and_test(&root
->will_be_snapshoted
))
743 wake_up_atomic_t(&root
->will_be_snapshoted
);
747 /* copy of may_delete in fs/namei.c()
748 * Check whether we can remove a link victim from directory dir, check
749 * whether the type of victim is right.
750 * 1. We can't do it if dir is read-only (done in permission())
751 * 2. We should have write and exec permissions on dir
752 * 3. We can't remove anything from append-only dir
753 * 4. We can't do anything with immutable dir (done in permission())
754 * 5. If the sticky bit on dir is set we should either
755 * a. be owner of dir, or
756 * b. be owner of victim, or
757 * c. have CAP_FOWNER capability
758 * 6. If the victim is append-only or immutable we can't do antyhing with
759 * links pointing to it.
760 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
761 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
762 * 9. We can't remove a root or mountpoint.
763 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
764 * nfs_async_unlink().
767 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
771 if (d_really_is_negative(victim
))
774 BUG_ON(d_inode(victim
->d_parent
) != dir
);
775 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
777 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
782 if (check_sticky(dir
, d_inode(victim
)) || IS_APPEND(d_inode(victim
)) ||
783 IS_IMMUTABLE(d_inode(victim
)) || IS_SWAPFILE(d_inode(victim
)))
786 if (!d_is_dir(victim
))
790 } else if (d_is_dir(victim
))
794 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
799 /* copy of may_create in fs/namei.c() */
800 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
802 if (d_really_is_positive(child
))
806 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
810 * Create a new subvolume below @parent. This is largely modeled after
811 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
812 * inside this filesystem so it's quite a bit simpler.
814 static noinline
int btrfs_mksubvol(struct path
*parent
,
815 char *name
, int namelen
,
816 struct btrfs_root
*snap_src
,
817 u64
*async_transid
, bool readonly
,
818 struct btrfs_qgroup_inherit
*inherit
)
820 struct inode
*dir
= d_inode(parent
->dentry
);
821 struct dentry
*dentry
;
824 error
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
828 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
829 error
= PTR_ERR(dentry
);
834 if (d_really_is_positive(dentry
))
837 error
= btrfs_may_create(dir
, dentry
);
842 * even if this name doesn't exist, we may get hash collisions.
843 * check for them now when we can safely fail
845 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
851 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
853 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
857 error
= create_snapshot(snap_src
, dir
, dentry
, name
, namelen
,
858 async_transid
, readonly
, inherit
);
860 error
= create_subvol(dir
, dentry
, name
, namelen
,
861 async_transid
, inherit
);
864 fsnotify_mkdir(dir
, dentry
);
866 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
870 mutex_unlock(&dir
->i_mutex
);
875 * When we're defragging a range, we don't want to kick it off again
876 * if it is really just waiting for delalloc to send it down.
877 * If we find a nice big extent or delalloc range for the bytes in the
878 * file you want to defrag, we return 0 to let you know to skip this
881 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
883 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
884 struct extent_map
*em
= NULL
;
885 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
888 read_lock(&em_tree
->lock
);
889 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_CACHE_SIZE
);
890 read_unlock(&em_tree
->lock
);
893 end
= extent_map_end(em
);
895 if (end
- offset
> thresh
)
898 /* if we already have a nice delalloc here, just stop */
900 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
901 thresh
, EXTENT_DELALLOC
, 1);
908 * helper function to walk through a file and find extents
909 * newer than a specific transid, and smaller than thresh.
911 * This is used by the defragging code to find new and small
914 static int find_new_extents(struct btrfs_root
*root
,
915 struct inode
*inode
, u64 newer_than
,
916 u64
*off
, u32 thresh
)
918 struct btrfs_path
*path
;
919 struct btrfs_key min_key
;
920 struct extent_buffer
*leaf
;
921 struct btrfs_file_extent_item
*extent
;
924 u64 ino
= btrfs_ino(inode
);
926 path
= btrfs_alloc_path();
930 min_key
.objectid
= ino
;
931 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
932 min_key
.offset
= *off
;
935 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
939 if (min_key
.objectid
!= ino
)
941 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
944 leaf
= path
->nodes
[0];
945 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
946 struct btrfs_file_extent_item
);
948 type
= btrfs_file_extent_type(leaf
, extent
);
949 if (type
== BTRFS_FILE_EXTENT_REG
&&
950 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
951 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
952 *off
= min_key
.offset
;
953 btrfs_free_path(path
);
958 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
959 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
963 if (min_key
.offset
== (u64
)-1)
967 btrfs_release_path(path
);
970 btrfs_free_path(path
);
974 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
976 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
977 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
978 struct extent_map
*em
;
979 u64 len
= PAGE_CACHE_SIZE
;
982 * hopefully we have this extent in the tree already, try without
983 * the full extent lock
985 read_lock(&em_tree
->lock
);
986 em
= lookup_extent_mapping(em_tree
, start
, len
);
987 read_unlock(&em_tree
->lock
);
990 struct extent_state
*cached
= NULL
;
991 u64 end
= start
+ len
- 1;
993 /* get the big lock and read metadata off disk */
994 lock_extent_bits(io_tree
, start
, end
, 0, &cached
);
995 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
996 unlock_extent_cached(io_tree
, start
, end
, &cached
, GFP_NOFS
);
1005 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1007 struct extent_map
*next
;
1010 /* this is the last extent */
1011 if (em
->start
+ em
->len
>= i_size_read(inode
))
1014 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1015 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1017 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1018 (em
->block_len
> 128 * 1024 && next
->block_len
> 128 * 1024))
1021 free_extent_map(next
);
1025 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1026 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1029 struct extent_map
*em
;
1031 bool next_mergeable
= true;
1034 * make sure that once we start defragging an extent, we keep on
1037 if (start
< *defrag_end
)
1042 em
= defrag_lookup_extent(inode
, start
);
1046 /* this will cover holes, and inline extents */
1047 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1052 next_mergeable
= defrag_check_next_extent(inode
, em
);
1054 * we hit a real extent, if it is big or the next extent is not a
1055 * real extent, don't bother defragging it
1057 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1058 (em
->len
>= thresh
|| !next_mergeable
))
1062 * last_len ends up being a counter of how many bytes we've defragged.
1063 * every time we choose not to defrag an extent, we reset *last_len
1064 * so that the next tiny extent will force a defrag.
1066 * The end result of this is that tiny extents before a single big
1067 * extent will force at least part of that big extent to be defragged.
1070 *defrag_end
= extent_map_end(em
);
1073 *skip
= extent_map_end(em
);
1077 free_extent_map(em
);
1082 * it doesn't do much good to defrag one or two pages
1083 * at a time. This pulls in a nice chunk of pages
1084 * to COW and defrag.
1086 * It also makes sure the delalloc code has enough
1087 * dirty data to avoid making new small extents as part
1090 * It's a good idea to start RA on this range
1091 * before calling this.
1093 static int cluster_pages_for_defrag(struct inode
*inode
,
1094 struct page
**pages
,
1095 unsigned long start_index
,
1096 unsigned long num_pages
)
1098 unsigned long file_end
;
1099 u64 isize
= i_size_read(inode
);
1106 struct btrfs_ordered_extent
*ordered
;
1107 struct extent_state
*cached_state
= NULL
;
1108 struct extent_io_tree
*tree
;
1109 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1111 file_end
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1112 if (!isize
|| start_index
> file_end
)
1115 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1117 ret
= btrfs_delalloc_reserve_space(inode
,
1118 page_cnt
<< PAGE_CACHE_SHIFT
);
1122 tree
= &BTRFS_I(inode
)->io_tree
;
1124 /* step one, lock all the pages */
1125 for (i
= 0; i
< page_cnt
; i
++) {
1128 page
= find_or_create_page(inode
->i_mapping
,
1129 start_index
+ i
, mask
);
1133 page_start
= page_offset(page
);
1134 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1136 lock_extent_bits(tree
, page_start
, page_end
,
1138 ordered
= btrfs_lookup_ordered_extent(inode
,
1140 unlock_extent_cached(tree
, page_start
, page_end
,
1141 &cached_state
, GFP_NOFS
);
1146 btrfs_start_ordered_extent(inode
, ordered
, 1);
1147 btrfs_put_ordered_extent(ordered
);
1150 * we unlocked the page above, so we need check if
1151 * it was released or not.
1153 if (page
->mapping
!= inode
->i_mapping
) {
1155 page_cache_release(page
);
1160 if (!PageUptodate(page
)) {
1161 btrfs_readpage(NULL
, page
);
1163 if (!PageUptodate(page
)) {
1165 page_cache_release(page
);
1171 if (page
->mapping
!= inode
->i_mapping
) {
1173 page_cache_release(page
);
1183 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1187 * so now we have a nice long stream of locked
1188 * and up to date pages, lets wait on them
1190 for (i
= 0; i
< i_done
; i
++)
1191 wait_on_page_writeback(pages
[i
]);
1193 page_start
= page_offset(pages
[0]);
1194 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_CACHE_SIZE
;
1196 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1197 page_start
, page_end
- 1, 0, &cached_state
);
1198 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1199 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1200 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1201 &cached_state
, GFP_NOFS
);
1203 if (i_done
!= page_cnt
) {
1204 spin_lock(&BTRFS_I(inode
)->lock
);
1205 BTRFS_I(inode
)->outstanding_extents
++;
1206 spin_unlock(&BTRFS_I(inode
)->lock
);
1207 btrfs_delalloc_release_space(inode
,
1208 (page_cnt
- i_done
) << PAGE_CACHE_SHIFT
);
1212 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1213 &cached_state
, GFP_NOFS
);
1215 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1216 page_start
, page_end
- 1, &cached_state
,
1219 for (i
= 0; i
< i_done
; i
++) {
1220 clear_page_dirty_for_io(pages
[i
]);
1221 ClearPageChecked(pages
[i
]);
1222 set_page_extent_mapped(pages
[i
]);
1223 set_page_dirty(pages
[i
]);
1224 unlock_page(pages
[i
]);
1225 page_cache_release(pages
[i
]);
1229 for (i
= 0; i
< i_done
; i
++) {
1230 unlock_page(pages
[i
]);
1231 page_cache_release(pages
[i
]);
1233 btrfs_delalloc_release_space(inode
, page_cnt
<< PAGE_CACHE_SHIFT
);
1238 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1239 struct btrfs_ioctl_defrag_range_args
*range
,
1240 u64 newer_than
, unsigned long max_to_defrag
)
1242 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1243 struct file_ra_state
*ra
= NULL
;
1244 unsigned long last_index
;
1245 u64 isize
= i_size_read(inode
);
1249 u64 newer_off
= range
->start
;
1251 unsigned long ra_index
= 0;
1253 int defrag_count
= 0;
1254 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1255 u32 extent_thresh
= range
->extent_thresh
;
1256 unsigned long max_cluster
= (256 * 1024) >> PAGE_CACHE_SHIFT
;
1257 unsigned long cluster
= max_cluster
;
1258 u64 new_align
= ~((u64
)128 * 1024 - 1);
1259 struct page
**pages
= NULL
;
1264 if (range
->start
>= isize
)
1267 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1268 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1270 if (range
->compress_type
)
1271 compress_type
= range
->compress_type
;
1274 if (extent_thresh
== 0)
1275 extent_thresh
= 256 * 1024;
1278 * if we were not given a file, allocate a readahead
1282 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
1285 file_ra_state_init(ra
, inode
->i_mapping
);
1290 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*),
1297 /* find the last page to defrag */
1298 if (range
->start
+ range
->len
> range
->start
) {
1299 last_index
= min_t(u64
, isize
- 1,
1300 range
->start
+ range
->len
- 1) >> PAGE_CACHE_SHIFT
;
1302 last_index
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1306 ret
= find_new_extents(root
, inode
, newer_than
,
1307 &newer_off
, 64 * 1024);
1309 range
->start
= newer_off
;
1311 * we always align our defrag to help keep
1312 * the extents in the file evenly spaced
1314 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1318 i
= range
->start
>> PAGE_CACHE_SHIFT
;
1321 max_to_defrag
= last_index
+ 1;
1324 * make writeback starts from i, so the defrag range can be
1325 * written sequentially.
1327 if (i
< inode
->i_mapping
->writeback_index
)
1328 inode
->i_mapping
->writeback_index
= i
;
1330 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1331 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_CACHE_SIZE
))) {
1333 * make sure we stop running if someone unmounts
1336 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1339 if (btrfs_defrag_cancelled(root
->fs_info
)) {
1340 printk(KERN_DEBUG
"BTRFS: defrag_file cancelled\n");
1345 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_CACHE_SHIFT
,
1346 extent_thresh
, &last_len
, &skip
,
1347 &defrag_end
, range
->flags
&
1348 BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1351 * the should_defrag function tells us how much to skip
1352 * bump our counter by the suggested amount
1354 next
= DIV_ROUND_UP(skip
, PAGE_CACHE_SIZE
);
1355 i
= max(i
+ 1, next
);
1360 cluster
= (PAGE_CACHE_ALIGN(defrag_end
) >>
1361 PAGE_CACHE_SHIFT
) - i
;
1362 cluster
= min(cluster
, max_cluster
);
1364 cluster
= max_cluster
;
1367 if (i
+ cluster
> ra_index
) {
1368 ra_index
= max(i
, ra_index
);
1369 btrfs_force_ra(inode
->i_mapping
, ra
, file
, ra_index
,
1371 ra_index
+= max_cluster
;
1374 mutex_lock(&inode
->i_mutex
);
1375 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
1376 BTRFS_I(inode
)->force_compress
= compress_type
;
1377 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1379 mutex_unlock(&inode
->i_mutex
);
1383 defrag_count
+= ret
;
1384 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1385 mutex_unlock(&inode
->i_mutex
);
1388 if (newer_off
== (u64
)-1)
1394 newer_off
= max(newer_off
+ 1,
1395 (u64
)i
<< PAGE_CACHE_SHIFT
);
1397 ret
= find_new_extents(root
, inode
,
1398 newer_than
, &newer_off
,
1401 range
->start
= newer_off
;
1402 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1409 last_len
+= ret
<< PAGE_CACHE_SHIFT
;
1417 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1418 filemap_flush(inode
->i_mapping
);
1419 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1420 &BTRFS_I(inode
)->runtime_flags
))
1421 filemap_flush(inode
->i_mapping
);
1424 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1425 /* the filemap_flush will queue IO into the worker threads, but
1426 * we have to make sure the IO is actually started and that
1427 * ordered extents get created before we return
1429 atomic_inc(&root
->fs_info
->async_submit_draining
);
1430 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
1431 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1432 wait_event(root
->fs_info
->async_submit_wait
,
1433 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
1434 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
1436 atomic_dec(&root
->fs_info
->async_submit_draining
);
1439 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1440 btrfs_set_fs_incompat(root
->fs_info
, COMPRESS_LZO
);
1446 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1447 mutex_lock(&inode
->i_mutex
);
1448 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
1449 mutex_unlock(&inode
->i_mutex
);
1457 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1463 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
1464 struct btrfs_ioctl_vol_args
*vol_args
;
1465 struct btrfs_trans_handle
*trans
;
1466 struct btrfs_device
*device
= NULL
;
1469 char *devstr
= NULL
;
1473 if (!capable(CAP_SYS_ADMIN
))
1476 ret
= mnt_want_write_file(file
);
1480 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
1482 mnt_drop_write_file(file
);
1483 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1486 mutex_lock(&root
->fs_info
->volume_mutex
);
1487 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1488 if (IS_ERR(vol_args
)) {
1489 ret
= PTR_ERR(vol_args
);
1493 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1495 sizestr
= vol_args
->name
;
1496 devstr
= strchr(sizestr
, ':');
1498 sizestr
= devstr
+ 1;
1500 devstr
= vol_args
->name
;
1501 ret
= kstrtoull(devstr
, 10, &devid
);
1508 btrfs_info(root
->fs_info
, "resizing devid %llu", devid
);
1511 device
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
1513 btrfs_info(root
->fs_info
, "resizer unable to find device %llu",
1519 if (!device
->writeable
) {
1520 btrfs_info(root
->fs_info
,
1521 "resizer unable to apply on readonly device %llu",
1527 if (!strcmp(sizestr
, "max"))
1528 new_size
= device
->bdev
->bd_inode
->i_size
;
1530 if (sizestr
[0] == '-') {
1533 } else if (sizestr
[0] == '+') {
1537 new_size
= memparse(sizestr
, &retptr
);
1538 if (*retptr
!= '\0' || new_size
== 0) {
1544 if (device
->is_tgtdev_for_dev_replace
) {
1549 old_size
= btrfs_device_get_total_bytes(device
);
1552 if (new_size
> old_size
) {
1556 new_size
= old_size
- new_size
;
1557 } else if (mod
> 0) {
1558 if (new_size
> ULLONG_MAX
- old_size
) {
1562 new_size
= old_size
+ new_size
;
1565 if (new_size
< 256 * 1024 * 1024) {
1569 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1574 new_size
= div_u64(new_size
, root
->sectorsize
);
1575 new_size
*= root
->sectorsize
;
1577 printk_in_rcu(KERN_INFO
"BTRFS: new size for %s is %llu\n",
1578 rcu_str_deref(device
->name
), new_size
);
1580 if (new_size
> old_size
) {
1581 trans
= btrfs_start_transaction(root
, 0);
1582 if (IS_ERR(trans
)) {
1583 ret
= PTR_ERR(trans
);
1586 ret
= btrfs_grow_device(trans
, device
, new_size
);
1587 btrfs_commit_transaction(trans
, root
);
1588 } else if (new_size
< old_size
) {
1589 ret
= btrfs_shrink_device(device
, new_size
);
1590 } /* equal, nothing need to do */
1595 mutex_unlock(&root
->fs_info
->volume_mutex
);
1596 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
1597 mnt_drop_write_file(file
);
1601 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1602 char *name
, unsigned long fd
, int subvol
,
1603 u64
*transid
, bool readonly
,
1604 struct btrfs_qgroup_inherit
*inherit
)
1609 ret
= mnt_want_write_file(file
);
1613 namelen
= strlen(name
);
1614 if (strchr(name
, '/')) {
1616 goto out_drop_write
;
1619 if (name
[0] == '.' &&
1620 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1622 goto out_drop_write
;
1626 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1627 NULL
, transid
, readonly
, inherit
);
1629 struct fd src
= fdget(fd
);
1630 struct inode
*src_inode
;
1633 goto out_drop_write
;
1636 src_inode
= file_inode(src
.file
);
1637 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1638 btrfs_info(BTRFS_I(src_inode
)->root
->fs_info
,
1639 "Snapshot src from another FS");
1641 } else if (!inode_owner_or_capable(src_inode
)) {
1643 * Subvolume creation is not restricted, but snapshots
1644 * are limited to own subvolumes only
1648 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1649 BTRFS_I(src_inode
)->root
,
1650 transid
, readonly
, inherit
);
1655 mnt_drop_write_file(file
);
1660 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1661 void __user
*arg
, int subvol
)
1663 struct btrfs_ioctl_vol_args
*vol_args
;
1666 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1667 if (IS_ERR(vol_args
))
1668 return PTR_ERR(vol_args
);
1669 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1671 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1672 vol_args
->fd
, subvol
,
1679 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1680 void __user
*arg
, int subvol
)
1682 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1686 bool readonly
= false;
1687 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1689 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1690 if (IS_ERR(vol_args
))
1691 return PTR_ERR(vol_args
);
1692 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1694 if (vol_args
->flags
&
1695 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1696 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1701 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1703 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1705 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1706 if (vol_args
->size
> PAGE_CACHE_SIZE
) {
1710 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1711 if (IS_ERR(inherit
)) {
1712 ret
= PTR_ERR(inherit
);
1717 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1718 vol_args
->fd
, subvol
, ptr
,
1723 if (ptr
&& copy_to_user(arg
+
1724 offsetof(struct btrfs_ioctl_vol_args_v2
,
1736 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1739 struct inode
*inode
= file_inode(file
);
1740 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1744 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
)
1747 down_read(&root
->fs_info
->subvol_sem
);
1748 if (btrfs_root_readonly(root
))
1749 flags
|= BTRFS_SUBVOL_RDONLY
;
1750 up_read(&root
->fs_info
->subvol_sem
);
1752 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1758 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1761 struct inode
*inode
= file_inode(file
);
1762 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1763 struct btrfs_trans_handle
*trans
;
1768 if (!inode_owner_or_capable(inode
))
1771 ret
= mnt_want_write_file(file
);
1775 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
1777 goto out_drop_write
;
1780 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1782 goto out_drop_write
;
1785 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1787 goto out_drop_write
;
1790 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1792 goto out_drop_write
;
1795 down_write(&root
->fs_info
->subvol_sem
);
1798 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1801 root_flags
= btrfs_root_flags(&root
->root_item
);
1802 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1803 btrfs_set_root_flags(&root
->root_item
,
1804 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1807 * Block RO -> RW transition if this subvolume is involved in
1810 spin_lock(&root
->root_item_lock
);
1811 if (root
->send_in_progress
== 0) {
1812 btrfs_set_root_flags(&root
->root_item
,
1813 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1814 spin_unlock(&root
->root_item_lock
);
1816 spin_unlock(&root
->root_item_lock
);
1817 btrfs_warn(root
->fs_info
,
1818 "Attempt to set subvolume %llu read-write during send",
1819 root
->root_key
.objectid
);
1825 trans
= btrfs_start_transaction(root
, 1);
1826 if (IS_ERR(trans
)) {
1827 ret
= PTR_ERR(trans
);
1831 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
1832 &root
->root_key
, &root
->root_item
);
1834 btrfs_commit_transaction(trans
, root
);
1837 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1839 up_write(&root
->fs_info
->subvol_sem
);
1841 mnt_drop_write_file(file
);
1847 * helper to check if the subvolume references other subvolumes
1849 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1851 struct btrfs_path
*path
;
1852 struct btrfs_dir_item
*di
;
1853 struct btrfs_key key
;
1857 path
= btrfs_alloc_path();
1861 /* Make sure this root isn't set as the default subvol */
1862 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
1863 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
, path
,
1864 dir_id
, "default", 7, 0);
1865 if (di
&& !IS_ERR(di
)) {
1866 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
1867 if (key
.objectid
== root
->root_key
.objectid
) {
1869 btrfs_err(root
->fs_info
, "deleting default subvolume "
1870 "%llu is not allowed", key
.objectid
);
1873 btrfs_release_path(path
);
1876 key
.objectid
= root
->root_key
.objectid
;
1877 key
.type
= BTRFS_ROOT_REF_KEY
;
1878 key
.offset
= (u64
)-1;
1880 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
1887 if (path
->slots
[0] > 0) {
1889 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1890 if (key
.objectid
== root
->root_key
.objectid
&&
1891 key
.type
== BTRFS_ROOT_REF_KEY
)
1895 btrfs_free_path(path
);
1899 static noinline
int key_in_sk(struct btrfs_key
*key
,
1900 struct btrfs_ioctl_search_key
*sk
)
1902 struct btrfs_key test
;
1905 test
.objectid
= sk
->min_objectid
;
1906 test
.type
= sk
->min_type
;
1907 test
.offset
= sk
->min_offset
;
1909 ret
= btrfs_comp_cpu_keys(key
, &test
);
1913 test
.objectid
= sk
->max_objectid
;
1914 test
.type
= sk
->max_type
;
1915 test
.offset
= sk
->max_offset
;
1917 ret
= btrfs_comp_cpu_keys(key
, &test
);
1923 static noinline
int copy_to_sk(struct btrfs_root
*root
,
1924 struct btrfs_path
*path
,
1925 struct btrfs_key
*key
,
1926 struct btrfs_ioctl_search_key
*sk
,
1929 unsigned long *sk_offset
,
1933 struct extent_buffer
*leaf
;
1934 struct btrfs_ioctl_search_header sh
;
1935 unsigned long item_off
;
1936 unsigned long item_len
;
1942 leaf
= path
->nodes
[0];
1943 slot
= path
->slots
[0];
1944 nritems
= btrfs_header_nritems(leaf
);
1946 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1950 found_transid
= btrfs_header_generation(leaf
);
1952 for (i
= slot
; i
< nritems
; i
++) {
1953 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1954 item_len
= btrfs_item_size_nr(leaf
, i
);
1956 btrfs_item_key_to_cpu(leaf
, key
, i
);
1957 if (!key_in_sk(key
, sk
))
1960 if (sizeof(sh
) + item_len
> *buf_size
) {
1967 * return one empty item back for v1, which does not
1971 *buf_size
= sizeof(sh
) + item_len
;
1976 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
1981 sh
.objectid
= key
->objectid
;
1982 sh
.offset
= key
->offset
;
1983 sh
.type
= key
->type
;
1985 sh
.transid
= found_transid
;
1987 /* copy search result header */
1988 if (copy_to_user(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
1993 *sk_offset
+= sizeof(sh
);
1996 char __user
*up
= ubuf
+ *sk_offset
;
1998 if (read_extent_buffer_to_user(leaf
, up
,
1999 item_off
, item_len
)) {
2004 *sk_offset
+= item_len
;
2008 if (ret
) /* -EOVERFLOW from above */
2011 if (*num_found
>= sk
->nr_items
) {
2018 if (key
->offset
< (u64
)-1 && key
->offset
< sk
->max_offset
)
2020 else if (key
->type
< (u8
)-1 && key
->type
< sk
->max_type
) {
2023 } else if (key
->objectid
< (u64
)-1 && key
->objectid
< sk
->max_objectid
) {
2031 * 0: all items from this leaf copied, continue with next
2032 * 1: * more items can be copied, but unused buffer is too small
2033 * * all items were found
2034 * Either way, it will stops the loop which iterates to the next
2036 * -EOVERFLOW: item was to large for buffer
2037 * -EFAULT: could not copy extent buffer back to userspace
2042 static noinline
int search_ioctl(struct inode
*inode
,
2043 struct btrfs_ioctl_search_key
*sk
,
2047 struct btrfs_root
*root
;
2048 struct btrfs_key key
;
2049 struct btrfs_path
*path
;
2050 struct btrfs_fs_info
*info
= BTRFS_I(inode
)->root
->fs_info
;
2053 unsigned long sk_offset
= 0;
2055 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2056 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2060 path
= btrfs_alloc_path();
2064 if (sk
->tree_id
== 0) {
2065 /* search the root of the inode that was passed */
2066 root
= BTRFS_I(inode
)->root
;
2068 key
.objectid
= sk
->tree_id
;
2069 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2070 key
.offset
= (u64
)-1;
2071 root
= btrfs_read_fs_root_no_name(info
, &key
);
2073 printk(KERN_ERR
"BTRFS: could not find root %llu\n",
2075 btrfs_free_path(path
);
2080 key
.objectid
= sk
->min_objectid
;
2081 key
.type
= sk
->min_type
;
2082 key
.offset
= sk
->min_offset
;
2085 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2091 ret
= copy_to_sk(root
, path
, &key
, sk
, buf_size
, ubuf
,
2092 &sk_offset
, &num_found
);
2093 btrfs_release_path(path
);
2101 sk
->nr_items
= num_found
;
2102 btrfs_free_path(path
);
2106 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2109 struct btrfs_ioctl_search_args __user
*uargs
;
2110 struct btrfs_ioctl_search_key sk
;
2111 struct inode
*inode
;
2115 if (!capable(CAP_SYS_ADMIN
))
2118 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2120 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2123 buf_size
= sizeof(uargs
->buf
);
2125 inode
= file_inode(file
);
2126 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2129 * In the origin implementation an overflow is handled by returning a
2130 * search header with a len of zero, so reset ret.
2132 if (ret
== -EOVERFLOW
)
2135 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2140 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2143 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2144 struct btrfs_ioctl_search_args_v2 args
;
2145 struct inode
*inode
;
2148 const size_t buf_limit
= 16 * 1024 * 1024;
2150 if (!capable(CAP_SYS_ADMIN
))
2153 /* copy search header and buffer size */
2154 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2155 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2158 buf_size
= args
.buf_size
;
2160 if (buf_size
< sizeof(struct btrfs_ioctl_search_header
))
2163 /* limit result size to 16MB */
2164 if (buf_size
> buf_limit
)
2165 buf_size
= buf_limit
;
2167 inode
= file_inode(file
);
2168 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2169 (char *)(&uarg
->buf
[0]));
2170 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2172 else if (ret
== -EOVERFLOW
&&
2173 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2180 * Search INODE_REFs to identify path name of 'dirid' directory
2181 * in a 'tree_id' tree. and sets path name to 'name'.
2183 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2184 u64 tree_id
, u64 dirid
, char *name
)
2186 struct btrfs_root
*root
;
2187 struct btrfs_key key
;
2193 struct btrfs_inode_ref
*iref
;
2194 struct extent_buffer
*l
;
2195 struct btrfs_path
*path
;
2197 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2202 path
= btrfs_alloc_path();
2206 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
2208 key
.objectid
= tree_id
;
2209 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2210 key
.offset
= (u64
)-1;
2211 root
= btrfs_read_fs_root_no_name(info
, &key
);
2213 printk(KERN_ERR
"BTRFS: could not find root %llu\n", tree_id
);
2218 key
.objectid
= dirid
;
2219 key
.type
= BTRFS_INODE_REF_KEY
;
2220 key
.offset
= (u64
)-1;
2223 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2227 ret
= btrfs_previous_item(root
, path
, dirid
,
2228 BTRFS_INODE_REF_KEY
);
2238 slot
= path
->slots
[0];
2239 btrfs_item_key_to_cpu(l
, &key
, slot
);
2241 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2242 len
= btrfs_inode_ref_name_len(l
, iref
);
2244 total_len
+= len
+ 1;
2246 ret
= -ENAMETOOLONG
;
2251 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2253 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2256 btrfs_release_path(path
);
2257 key
.objectid
= key
.offset
;
2258 key
.offset
= (u64
)-1;
2259 dirid
= key
.objectid
;
2261 memmove(name
, ptr
, total_len
);
2262 name
[total_len
] = '\0';
2265 btrfs_free_path(path
);
2269 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2272 struct btrfs_ioctl_ino_lookup_args
*args
;
2273 struct inode
*inode
;
2276 if (!capable(CAP_SYS_ADMIN
))
2279 args
= memdup_user(argp
, sizeof(*args
));
2281 return PTR_ERR(args
);
2283 inode
= file_inode(file
);
2285 if (args
->treeid
== 0)
2286 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2288 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2289 args
->treeid
, args
->objectid
,
2292 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2299 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2302 struct dentry
*parent
= file
->f_path
.dentry
;
2303 struct dentry
*dentry
;
2304 struct inode
*dir
= d_inode(parent
);
2305 struct inode
*inode
;
2306 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2307 struct btrfs_root
*dest
= NULL
;
2308 struct btrfs_ioctl_vol_args
*vol_args
;
2309 struct btrfs_trans_handle
*trans
;
2310 struct btrfs_block_rsv block_rsv
;
2312 u64 qgroup_reserved
;
2317 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2318 if (IS_ERR(vol_args
))
2319 return PTR_ERR(vol_args
);
2321 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2322 namelen
= strlen(vol_args
->name
);
2323 if (strchr(vol_args
->name
, '/') ||
2324 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2329 err
= mnt_want_write_file(file
);
2334 err
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
2336 goto out_drop_write
;
2337 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2338 if (IS_ERR(dentry
)) {
2339 err
= PTR_ERR(dentry
);
2340 goto out_unlock_dir
;
2343 if (d_really_is_negative(dentry
)) {
2348 inode
= d_inode(dentry
);
2349 dest
= BTRFS_I(inode
)->root
;
2350 if (!capable(CAP_SYS_ADMIN
)) {
2352 * Regular user. Only allow this with a special mount
2353 * option, when the user has write+exec access to the
2354 * subvol root, and when rmdir(2) would have been
2357 * Note that this is _not_ check that the subvol is
2358 * empty or doesn't contain data that we wouldn't
2359 * otherwise be able to delete.
2361 * Users who want to delete empty subvols should try
2365 if (!btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
2369 * Do not allow deletion if the parent dir is the same
2370 * as the dir to be deleted. That means the ioctl
2371 * must be called on the dentry referencing the root
2372 * of the subvol, not a random directory contained
2379 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2384 /* check if subvolume may be deleted by a user */
2385 err
= btrfs_may_delete(dir
, dentry
, 1);
2389 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
2394 mutex_lock(&inode
->i_mutex
);
2397 * Don't allow to delete a subvolume with send in progress. This is
2398 * inside the i_mutex so the error handling that has to drop the bit
2399 * again is not run concurrently.
2401 spin_lock(&dest
->root_item_lock
);
2402 root_flags
= btrfs_root_flags(&dest
->root_item
);
2403 if (dest
->send_in_progress
== 0) {
2404 btrfs_set_root_flags(&dest
->root_item
,
2405 root_flags
| BTRFS_ROOT_SUBVOL_DEAD
);
2406 spin_unlock(&dest
->root_item_lock
);
2408 spin_unlock(&dest
->root_item_lock
);
2409 btrfs_warn(root
->fs_info
,
2410 "Attempt to delete subvolume %llu during send",
2411 dest
->root_key
.objectid
);
2413 goto out_unlock_inode
;
2416 d_invalidate(dentry
);
2418 down_write(&root
->fs_info
->subvol_sem
);
2420 err
= may_destroy_subvol(dest
);
2424 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
2426 * One for dir inode, two for dir entries, two for root
2429 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
2430 5, &qgroup_reserved
, true);
2434 trans
= btrfs_start_transaction(root
, 0);
2435 if (IS_ERR(trans
)) {
2436 err
= PTR_ERR(trans
);
2439 trans
->block_rsv
= &block_rsv
;
2440 trans
->bytes_reserved
= block_rsv
.size
;
2442 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
2443 dest
->root_key
.objectid
,
2444 dentry
->d_name
.name
,
2445 dentry
->d_name
.len
);
2448 btrfs_abort_transaction(trans
, root
, ret
);
2452 btrfs_record_root_in_trans(trans
, dest
);
2454 memset(&dest
->root_item
.drop_progress
, 0,
2455 sizeof(dest
->root_item
.drop_progress
));
2456 dest
->root_item
.drop_level
= 0;
2457 btrfs_set_root_refs(&dest
->root_item
, 0);
2459 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &dest
->state
)) {
2460 ret
= btrfs_insert_orphan_item(trans
,
2461 root
->fs_info
->tree_root
,
2462 dest
->root_key
.objectid
);
2464 btrfs_abort_transaction(trans
, root
, ret
);
2470 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2471 dest
->root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
2472 dest
->root_key
.objectid
);
2473 if (ret
&& ret
!= -ENOENT
) {
2474 btrfs_abort_transaction(trans
, root
, ret
);
2478 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
2479 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2480 dest
->root_item
.received_uuid
,
2481 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
2482 dest
->root_key
.objectid
);
2483 if (ret
&& ret
!= -ENOENT
) {
2484 btrfs_abort_transaction(trans
, root
, ret
);
2491 trans
->block_rsv
= NULL
;
2492 trans
->bytes_reserved
= 0;
2493 ret
= btrfs_end_transaction(trans
, root
);
2496 inode
->i_flags
|= S_DEAD
;
2498 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
2500 up_write(&root
->fs_info
->subvol_sem
);
2502 spin_lock(&dest
->root_item_lock
);
2503 root_flags
= btrfs_root_flags(&dest
->root_item
);
2504 btrfs_set_root_flags(&dest
->root_item
,
2505 root_flags
& ~BTRFS_ROOT_SUBVOL_DEAD
);
2506 spin_unlock(&dest
->root_item_lock
);
2509 mutex_unlock(&inode
->i_mutex
);
2511 shrink_dcache_sb(root
->fs_info
->sb
);
2512 btrfs_invalidate_inodes(dest
);
2514 ASSERT(dest
->send_in_progress
== 0);
2517 if (dest
->ino_cache_inode
) {
2518 iput(dest
->ino_cache_inode
);
2519 dest
->ino_cache_inode
= NULL
;
2525 mutex_unlock(&dir
->i_mutex
);
2527 mnt_drop_write_file(file
);
2533 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2535 struct inode
*inode
= file_inode(file
);
2536 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2537 struct btrfs_ioctl_defrag_range_args
*range
;
2540 ret
= mnt_want_write_file(file
);
2544 if (btrfs_root_readonly(root
)) {
2549 switch (inode
->i_mode
& S_IFMT
) {
2551 if (!capable(CAP_SYS_ADMIN
)) {
2555 ret
= btrfs_defrag_root(root
);
2558 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
);
2561 if (!(file
->f_mode
& FMODE_WRITE
)) {
2566 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2573 if (copy_from_user(range
, argp
,
2579 /* compression requires us to start the IO */
2580 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2581 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2582 range
->extent_thresh
= (u32
)-1;
2585 /* the rest are all set to zero by kzalloc */
2586 range
->len
= (u64
)-1;
2588 ret
= btrfs_defrag_file(file_inode(file
), file
,
2598 mnt_drop_write_file(file
);
2602 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
2604 struct btrfs_ioctl_vol_args
*vol_args
;
2607 if (!capable(CAP_SYS_ADMIN
))
2610 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2612 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2615 mutex_lock(&root
->fs_info
->volume_mutex
);
2616 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2617 if (IS_ERR(vol_args
)) {
2618 ret
= PTR_ERR(vol_args
);
2622 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2623 ret
= btrfs_init_new_device(root
, vol_args
->name
);
2626 btrfs_info(root
->fs_info
, "disk added %s",vol_args
->name
);
2630 mutex_unlock(&root
->fs_info
->volume_mutex
);
2631 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2635 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
2637 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
2638 struct btrfs_ioctl_vol_args
*vol_args
;
2641 if (!capable(CAP_SYS_ADMIN
))
2644 ret
= mnt_want_write_file(file
);
2648 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2649 if (IS_ERR(vol_args
)) {
2650 ret
= PTR_ERR(vol_args
);
2654 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2656 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2658 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2662 mutex_lock(&root
->fs_info
->volume_mutex
);
2663 ret
= btrfs_rm_device(root
, vol_args
->name
);
2664 mutex_unlock(&root
->fs_info
->volume_mutex
);
2665 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2668 btrfs_info(root
->fs_info
, "disk deleted %s",vol_args
->name
);
2673 mnt_drop_write_file(file
);
2677 static long btrfs_ioctl_fs_info(struct btrfs_root
*root
, void __user
*arg
)
2679 struct btrfs_ioctl_fs_info_args
*fi_args
;
2680 struct btrfs_device
*device
;
2681 struct btrfs_device
*next
;
2682 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2685 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
2689 mutex_lock(&fs_devices
->device_list_mutex
);
2690 fi_args
->num_devices
= fs_devices
->num_devices
;
2691 memcpy(&fi_args
->fsid
, root
->fs_info
->fsid
, sizeof(fi_args
->fsid
));
2693 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
2694 if (device
->devid
> fi_args
->max_id
)
2695 fi_args
->max_id
= device
->devid
;
2697 mutex_unlock(&fs_devices
->device_list_mutex
);
2699 fi_args
->nodesize
= root
->fs_info
->super_copy
->nodesize
;
2700 fi_args
->sectorsize
= root
->fs_info
->super_copy
->sectorsize
;
2701 fi_args
->clone_alignment
= root
->fs_info
->super_copy
->sectorsize
;
2703 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
2710 static long btrfs_ioctl_dev_info(struct btrfs_root
*root
, void __user
*arg
)
2712 struct btrfs_ioctl_dev_info_args
*di_args
;
2713 struct btrfs_device
*dev
;
2714 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2716 char *s_uuid
= NULL
;
2718 di_args
= memdup_user(arg
, sizeof(*di_args
));
2719 if (IS_ERR(di_args
))
2720 return PTR_ERR(di_args
);
2722 if (!btrfs_is_empty_uuid(di_args
->uuid
))
2723 s_uuid
= di_args
->uuid
;
2725 mutex_lock(&fs_devices
->device_list_mutex
);
2726 dev
= btrfs_find_device(root
->fs_info
, di_args
->devid
, s_uuid
, NULL
);
2733 di_args
->devid
= dev
->devid
;
2734 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
2735 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
2736 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
2738 struct rcu_string
*name
;
2741 name
= rcu_dereference(dev
->name
);
2742 strncpy(di_args
->path
, name
->str
, sizeof(di_args
->path
));
2744 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
2746 di_args
->path
[0] = '\0';
2750 mutex_unlock(&fs_devices
->device_list_mutex
);
2751 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
2758 static struct page
*extent_same_get_page(struct inode
*inode
, u64 off
)
2762 struct extent_io_tree
*tree
= &BTRFS_I(inode
)->io_tree
;
2764 index
= off
>> PAGE_CACHE_SHIFT
;
2766 page
= grab_cache_page(inode
->i_mapping
, index
);
2770 if (!PageUptodate(page
)) {
2771 if (extent_read_full_page_nolock(tree
, page
, btrfs_get_extent
,
2775 if (!PageUptodate(page
)) {
2777 page_cache_release(page
);
2786 static inline void lock_extent_range(struct inode
*inode
, u64 off
, u64 len
)
2788 /* do any pending delalloc/csum calc on src, one way or
2789 another, and lock file content */
2791 struct btrfs_ordered_extent
*ordered
;
2792 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2793 ordered
= btrfs_lookup_first_ordered_extent(inode
,
2796 ordered
->file_offset
+ ordered
->len
<= off
||
2797 ordered
->file_offset
>= off
+ len
) &&
2798 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
2799 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
)) {
2801 btrfs_put_ordered_extent(ordered
);
2804 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2806 btrfs_put_ordered_extent(ordered
);
2807 btrfs_wait_ordered_range(inode
, off
, len
);
2811 static void btrfs_double_unlock(struct inode
*inode1
, u64 loff1
,
2812 struct inode
*inode2
, u64 loff2
, u64 len
)
2814 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
2815 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
2817 mutex_unlock(&inode1
->i_mutex
);
2818 mutex_unlock(&inode2
->i_mutex
);
2821 static void btrfs_double_lock(struct inode
*inode1
, u64 loff1
,
2822 struct inode
*inode2
, u64 loff2
, u64 len
)
2824 if (inode1
< inode2
) {
2825 swap(inode1
, inode2
);
2829 mutex_lock_nested(&inode1
->i_mutex
, I_MUTEX_PARENT
);
2830 lock_extent_range(inode1
, loff1
, len
);
2831 if (inode1
!= inode2
) {
2832 mutex_lock_nested(&inode2
->i_mutex
, I_MUTEX_CHILD
);
2833 lock_extent_range(inode2
, loff2
, len
);
2837 static int btrfs_cmp_data(struct inode
*src
, u64 loff
, struct inode
*dst
,
2838 u64 dst_loff
, u64 len
)
2841 struct page
*src_page
, *dst_page
;
2842 unsigned int cmp_len
= PAGE_CACHE_SIZE
;
2843 void *addr
, *dst_addr
;
2846 if (len
< PAGE_CACHE_SIZE
)
2849 src_page
= extent_same_get_page(src
, loff
);
2852 dst_page
= extent_same_get_page(dst
, dst_loff
);
2854 page_cache_release(src_page
);
2857 addr
= kmap_atomic(src_page
);
2858 dst_addr
= kmap_atomic(dst_page
);
2860 flush_dcache_page(src_page
);
2861 flush_dcache_page(dst_page
);
2863 if (memcmp(addr
, dst_addr
, cmp_len
))
2864 ret
= BTRFS_SAME_DATA_DIFFERS
;
2866 kunmap_atomic(addr
);
2867 kunmap_atomic(dst_addr
);
2868 page_cache_release(src_page
);
2869 page_cache_release(dst_page
);
2875 dst_loff
+= cmp_len
;
2882 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64 len
)
2884 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
2886 if (off
+ len
> inode
->i_size
|| off
+ len
< off
)
2888 /* Check that we are block aligned - btrfs_clone() requires this */
2889 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
2895 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 len
,
2896 struct inode
*dst
, u64 dst_loff
)
2901 * btrfs_clone() can't handle extents in the same file
2902 * yet. Once that works, we can drop this check and replace it
2903 * with a check for the same inode, but overlapping extents.
2911 btrfs_double_lock(src
, loff
, dst
, dst_loff
, len
);
2913 ret
= extent_same_check_offsets(src
, loff
, len
);
2917 ret
= extent_same_check_offsets(dst
, dst_loff
, len
);
2921 /* don't make the dst file partly checksummed */
2922 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
2923 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
2928 ret
= btrfs_cmp_data(src
, loff
, dst
, dst_loff
, len
);
2930 ret
= btrfs_clone(src
, dst
, loff
, len
, len
, dst_loff
);
2933 btrfs_double_unlock(src
, loff
, dst
, dst_loff
, len
);
2938 #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2940 static long btrfs_ioctl_file_extent_same(struct file
*file
,
2941 struct btrfs_ioctl_same_args __user
*argp
)
2943 struct btrfs_ioctl_same_args
*same
;
2944 struct btrfs_ioctl_same_extent_info
*info
;
2945 struct inode
*src
= file_inode(file
);
2951 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
2952 bool is_admin
= capable(CAP_SYS_ADMIN
);
2955 if (!(file
->f_mode
& FMODE_READ
))
2958 ret
= mnt_want_write_file(file
);
2962 if (get_user(count
, &argp
->dest_count
)) {
2967 size
= offsetof(struct btrfs_ioctl_same_args __user
, info
[count
]);
2969 same
= memdup_user(argp
, size
);
2972 ret
= PTR_ERR(same
);
2976 off
= same
->logical_offset
;
2980 * Limit the total length we will dedupe for each operation.
2981 * This is intended to bound the total time spent in this
2982 * ioctl to something sane.
2984 if (len
> BTRFS_MAX_DEDUPE_LEN
)
2985 len
= BTRFS_MAX_DEDUPE_LEN
;
2987 if (WARN_ON_ONCE(bs
< PAGE_CACHE_SIZE
)) {
2989 * Btrfs does not support blocksize < page_size. As a
2990 * result, btrfs_cmp_data() won't correctly handle
2991 * this situation without an update.
2998 if (S_ISDIR(src
->i_mode
))
3002 if (!S_ISREG(src
->i_mode
))
3005 /* pre-format output fields to sane values */
3006 for (i
= 0; i
< count
; i
++) {
3007 same
->info
[i
].bytes_deduped
= 0ULL;
3008 same
->info
[i
].status
= 0;
3011 for (i
= 0, info
= same
->info
; i
< count
; i
++, info
++) {
3013 struct fd dst_file
= fdget(info
->fd
);
3014 if (!dst_file
.file
) {
3015 info
->status
= -EBADF
;
3018 dst
= file_inode(dst_file
.file
);
3020 if (!(is_admin
|| (dst_file
.file
->f_mode
& FMODE_WRITE
))) {
3021 info
->status
= -EINVAL
;
3022 } else if (file
->f_path
.mnt
!= dst_file
.file
->f_path
.mnt
) {
3023 info
->status
= -EXDEV
;
3024 } else if (S_ISDIR(dst
->i_mode
)) {
3025 info
->status
= -EISDIR
;
3026 } else if (!S_ISREG(dst
->i_mode
)) {
3027 info
->status
= -EACCES
;
3029 info
->status
= btrfs_extent_same(src
, off
, len
, dst
,
3030 info
->logical_offset
);
3031 if (info
->status
== 0)
3032 info
->bytes_deduped
+= len
;
3037 ret
= copy_to_user(argp
, same
, size
);
3042 mnt_drop_write_file(file
);
3046 /* Helper to check and see if this root currently has a ref on the given disk
3047 * bytenr. If it does then we need to update the quota for this root. This
3048 * doesn't do anything if quotas aren't enabled.
3050 static int check_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
3053 struct seq_list tree_mod_seq_elem
= SEQ_LIST_INIT(tree_mod_seq_elem
);
3054 struct ulist
*roots
;
3055 struct ulist_iterator uiter
;
3056 struct ulist_node
*root_node
= NULL
;
3059 if (!root
->fs_info
->quota_enabled
)
3062 btrfs_get_tree_mod_seq(root
->fs_info
, &tree_mod_seq_elem
);
3063 ret
= btrfs_find_all_roots(trans
, root
->fs_info
, disko
,
3064 tree_mod_seq_elem
.seq
, &roots
);
3068 ULIST_ITER_INIT(&uiter
);
3069 while ((root_node
= ulist_next(roots
, &uiter
))) {
3070 if (root_node
->val
== root
->objectid
) {
3077 btrfs_put_tree_mod_seq(root
->fs_info
, &tree_mod_seq_elem
);
3081 static int clone_finish_inode_update(struct btrfs_trans_handle
*trans
,
3082 struct inode
*inode
,
3087 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3090 inode_inc_iversion(inode
);
3091 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3093 * We round up to the block size at eof when determining which
3094 * extents to clone above, but shouldn't round up the file size.
3096 if (endoff
> destoff
+ olen
)
3097 endoff
= destoff
+ olen
;
3098 if (endoff
> inode
->i_size
)
3099 btrfs_i_size_write(inode
, endoff
);
3101 ret
= btrfs_update_inode(trans
, root
, inode
);
3103 btrfs_abort_transaction(trans
, root
, ret
);
3104 btrfs_end_transaction(trans
, root
);
3107 ret
= btrfs_end_transaction(trans
, root
);
3112 static void clone_update_extent_map(struct inode
*inode
,
3113 const struct btrfs_trans_handle
*trans
,
3114 const struct btrfs_path
*path
,
3115 const u64 hole_offset
,
3118 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
3119 struct extent_map
*em
;
3122 em
= alloc_extent_map();
3124 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3125 &BTRFS_I(inode
)->runtime_flags
);
3130 struct btrfs_file_extent_item
*fi
;
3132 fi
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3133 struct btrfs_file_extent_item
);
3134 btrfs_extent_item_to_extent_map(inode
, path
, fi
, false, em
);
3135 em
->generation
= -1;
3136 if (btrfs_file_extent_type(path
->nodes
[0], fi
) ==
3137 BTRFS_FILE_EXTENT_INLINE
)
3138 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3139 &BTRFS_I(inode
)->runtime_flags
);
3141 em
->start
= hole_offset
;
3143 em
->ram_bytes
= em
->len
;
3144 em
->orig_start
= hole_offset
;
3145 em
->block_start
= EXTENT_MAP_HOLE
;
3147 em
->orig_block_len
= 0;
3148 em
->compress_type
= BTRFS_COMPRESS_NONE
;
3149 em
->generation
= trans
->transid
;
3153 write_lock(&em_tree
->lock
);
3154 ret
= add_extent_mapping(em_tree
, em
, 1);
3155 write_unlock(&em_tree
->lock
);
3156 if (ret
!= -EEXIST
) {
3157 free_extent_map(em
);
3160 btrfs_drop_extent_cache(inode
, em
->start
,
3161 em
->start
+ em
->len
- 1, 0);
3165 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3166 &BTRFS_I(inode
)->runtime_flags
);
3170 * btrfs_clone() - clone a range from inode file to another
3172 * @src: Inode to clone from
3173 * @inode: Inode to clone to
3174 * @off: Offset within source to start clone from
3175 * @olen: Original length, passed by user, of range to clone
3176 * @olen_aligned: Block-aligned value of olen, extent_same uses
3177 * identical values here
3178 * @destoff: Offset within @inode to start clone
3180 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
3181 const u64 off
, const u64 olen
, const u64 olen_aligned
,
3184 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3185 struct btrfs_path
*path
= NULL
;
3186 struct extent_buffer
*leaf
;
3187 struct btrfs_trans_handle
*trans
;
3189 struct btrfs_key key
;
3194 const u64 len
= olen_aligned
;
3196 u64 last_dest_end
= destoff
;
3199 buf
= vmalloc(root
->nodesize
);
3203 path
= btrfs_alloc_path();
3211 key
.objectid
= btrfs_ino(src
);
3212 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3216 u64 next_key_min_offset
= key
.offset
+ 1;
3219 * note the key will change type as we walk through the
3222 path
->leave_spinning
= 1;
3223 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
3228 * First search, if no extent item that starts at offset off was
3229 * found but the previous item is an extent item, it's possible
3230 * it might overlap our target range, therefore process it.
3232 if (key
.offset
== off
&& ret
> 0 && path
->slots
[0] > 0) {
3233 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3234 path
->slots
[0] - 1);
3235 if (key
.type
== BTRFS_EXTENT_DATA_KEY
)
3239 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3242 if (path
->slots
[0] >= nritems
) {
3243 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
3248 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3250 leaf
= path
->nodes
[0];
3251 slot
= path
->slots
[0];
3253 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
3254 if (key
.type
> BTRFS_EXTENT_DATA_KEY
||
3255 key
.objectid
!= btrfs_ino(src
))
3258 if (key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3259 struct btrfs_file_extent_item
*extent
;
3262 struct btrfs_key new_key
;
3263 u64 disko
= 0, diskl
= 0;
3264 u64 datao
= 0, datal
= 0;
3268 extent
= btrfs_item_ptr(leaf
, slot
,
3269 struct btrfs_file_extent_item
);
3270 comp
= btrfs_file_extent_compression(leaf
, extent
);
3271 type
= btrfs_file_extent_type(leaf
, extent
);
3272 if (type
== BTRFS_FILE_EXTENT_REG
||
3273 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3274 disko
= btrfs_file_extent_disk_bytenr(leaf
,
3276 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
3278 datao
= btrfs_file_extent_offset(leaf
, extent
);
3279 datal
= btrfs_file_extent_num_bytes(leaf
,
3281 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3282 /* take upper bound, may be compressed */
3283 datal
= btrfs_file_extent_ram_bytes(leaf
,
3288 * The first search might have left us at an extent
3289 * item that ends before our target range's start, can
3290 * happen if we have holes and NO_HOLES feature enabled.
3292 if (key
.offset
+ datal
<= off
) {
3295 } else if (key
.offset
>= off
+ len
) {
3298 next_key_min_offset
= key
.offset
+ datal
;
3299 size
= btrfs_item_size_nr(leaf
, slot
);
3300 read_extent_buffer(leaf
, buf
,
3301 btrfs_item_ptr_offset(leaf
, slot
),
3304 btrfs_release_path(path
);
3305 path
->leave_spinning
= 0;
3307 memcpy(&new_key
, &key
, sizeof(new_key
));
3308 new_key
.objectid
= btrfs_ino(inode
);
3309 if (off
<= key
.offset
)
3310 new_key
.offset
= key
.offset
+ destoff
- off
;
3312 new_key
.offset
= destoff
;
3315 * Deal with a hole that doesn't have an extent item
3316 * that represents it (NO_HOLES feature enabled).
3317 * This hole is either in the middle of the cloning
3318 * range or at the beginning (fully overlaps it or
3319 * partially overlaps it).
3321 if (new_key
.offset
!= last_dest_end
)
3322 drop_start
= last_dest_end
;
3324 drop_start
= new_key
.offset
;
3327 * 1 - adjusting old extent (we may have to split it)
3328 * 1 - add new extent
3331 trans
= btrfs_start_transaction(root
, 3);
3332 if (IS_ERR(trans
)) {
3333 ret
= PTR_ERR(trans
);
3337 if (type
== BTRFS_FILE_EXTENT_REG
||
3338 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3340 * a | --- range to clone ---| b
3341 * | ------------- extent ------------- |
3344 /* subtract range b */
3345 if (key
.offset
+ datal
> off
+ len
)
3346 datal
= off
+ len
- key
.offset
;
3348 /* subtract range a */
3349 if (off
> key
.offset
) {
3350 datao
+= off
- key
.offset
;
3351 datal
-= off
- key
.offset
;
3354 ret
= btrfs_drop_extents(trans
, root
, inode
,
3356 new_key
.offset
+ datal
,
3359 if (ret
!= -EOPNOTSUPP
)
3360 btrfs_abort_transaction(trans
,
3362 btrfs_end_transaction(trans
, root
);
3366 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3369 btrfs_abort_transaction(trans
, root
,
3371 btrfs_end_transaction(trans
, root
);
3375 leaf
= path
->nodes
[0];
3376 slot
= path
->slots
[0];
3377 write_extent_buffer(leaf
, buf
,
3378 btrfs_item_ptr_offset(leaf
, slot
),
3381 extent
= btrfs_item_ptr(leaf
, slot
,
3382 struct btrfs_file_extent_item
);
3384 /* disko == 0 means it's a hole */
3388 btrfs_set_file_extent_offset(leaf
, extent
,
3390 btrfs_set_file_extent_num_bytes(leaf
, extent
,
3394 * We need to look up the roots that point at
3395 * this bytenr and see if the new root does. If
3396 * it does not we need to make sure we update
3397 * quotas appropriately.
3399 if (disko
&& root
!= BTRFS_I(src
)->root
&&
3400 disko
!= last_disko
) {
3401 no_quota
= check_ref(trans
, root
,
3404 btrfs_abort_transaction(trans
,
3407 btrfs_end_transaction(trans
,
3415 inode_add_bytes(inode
, datal
);
3416 ret
= btrfs_inc_extent_ref(trans
, root
,
3418 root
->root_key
.objectid
,
3420 new_key
.offset
- datao
,
3423 btrfs_abort_transaction(trans
,
3426 btrfs_end_transaction(trans
,
3432 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3435 u64 aligned_end
= 0;
3437 if (off
> key
.offset
) {
3438 skip
= off
- key
.offset
;
3439 new_key
.offset
+= skip
;
3442 if (key
.offset
+ datal
> off
+ len
)
3443 trim
= key
.offset
+ datal
- (off
+ len
);
3445 if (comp
&& (skip
|| trim
)) {
3447 btrfs_end_transaction(trans
, root
);
3450 size
-= skip
+ trim
;
3451 datal
-= skip
+ trim
;
3453 aligned_end
= ALIGN(new_key
.offset
+ datal
,
3455 ret
= btrfs_drop_extents(trans
, root
, inode
,
3460 if (ret
!= -EOPNOTSUPP
)
3461 btrfs_abort_transaction(trans
,
3463 btrfs_end_transaction(trans
, root
);
3467 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3470 btrfs_abort_transaction(trans
, root
,
3472 btrfs_end_transaction(trans
, root
);
3478 btrfs_file_extent_calc_inline_size(0);
3479 memmove(buf
+start
, buf
+start
+skip
,
3483 leaf
= path
->nodes
[0];
3484 slot
= path
->slots
[0];
3485 write_extent_buffer(leaf
, buf
,
3486 btrfs_item_ptr_offset(leaf
, slot
),
3488 inode_add_bytes(inode
, datal
);
3491 /* If we have an implicit hole (NO_HOLES feature). */
3492 if (drop_start
< new_key
.offset
)
3493 clone_update_extent_map(inode
, trans
,
3495 new_key
.offset
- drop_start
);
3497 clone_update_extent_map(inode
, trans
, path
, 0, 0);
3499 btrfs_mark_buffer_dirty(leaf
);
3500 btrfs_release_path(path
);
3502 last_dest_end
= ALIGN(new_key
.offset
+ datal
,
3504 ret
= clone_finish_inode_update(trans
, inode
,
3509 if (new_key
.offset
+ datal
>= destoff
+ len
)
3512 btrfs_release_path(path
);
3513 key
.offset
= next_key_min_offset
;
3517 if (last_dest_end
< destoff
+ len
) {
3519 * We have an implicit hole (NO_HOLES feature is enabled) that
3520 * fully or partially overlaps our cloning range at its end.
3522 btrfs_release_path(path
);
3525 * 1 - remove extent(s)
3528 trans
= btrfs_start_transaction(root
, 2);
3529 if (IS_ERR(trans
)) {
3530 ret
= PTR_ERR(trans
);
3533 ret
= btrfs_drop_extents(trans
, root
, inode
,
3534 last_dest_end
, destoff
+ len
, 1);
3536 if (ret
!= -EOPNOTSUPP
)
3537 btrfs_abort_transaction(trans
, root
, ret
);
3538 btrfs_end_transaction(trans
, root
);
3541 clone_update_extent_map(inode
, trans
, NULL
, last_dest_end
,
3542 destoff
+ len
- last_dest_end
);
3543 ret
= clone_finish_inode_update(trans
, inode
, destoff
+ len
,
3548 btrfs_free_path(path
);
3553 static noinline
long btrfs_ioctl_clone(struct file
*file
, unsigned long srcfd
,
3554 u64 off
, u64 olen
, u64 destoff
)
3556 struct inode
*inode
= file_inode(file
);
3557 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3562 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
3567 * - split compressed inline extents. annoying: we need to
3568 * decompress into destination's address_space (the file offset
3569 * may change, so source mapping won't do), then recompress (or
3570 * otherwise reinsert) a subrange.
3572 * - split destination inode's inline extents. The inline extents can
3573 * be either compressed or non-compressed.
3576 /* the destination must be opened for writing */
3577 if (!(file
->f_mode
& FMODE_WRITE
) || (file
->f_flags
& O_APPEND
))
3580 if (btrfs_root_readonly(root
))
3583 ret
= mnt_want_write_file(file
);
3587 src_file
= fdget(srcfd
);
3588 if (!src_file
.file
) {
3590 goto out_drop_write
;
3594 if (src_file
.file
->f_path
.mnt
!= file
->f_path
.mnt
)
3597 src
= file_inode(src_file
.file
);
3603 /* the src must be open for reading */
3604 if (!(src_file
.file
->f_mode
& FMODE_READ
))
3607 /* don't make the dst file partly checksummed */
3608 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3609 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
))
3613 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
3617 if (src
->i_sb
!= inode
->i_sb
)
3622 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_PARENT
);
3623 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_CHILD
);
3625 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_PARENT
);
3626 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_CHILD
);
3629 mutex_lock(&src
->i_mutex
);
3632 /* determine range to clone */
3634 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
3637 olen
= len
= src
->i_size
- off
;
3638 /* if we extend to eof, continue to block boundary */
3639 if (off
+ len
== src
->i_size
)
3640 len
= ALIGN(src
->i_size
, bs
) - off
;
3647 /* verify the end result is block aligned */
3648 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
3649 !IS_ALIGNED(destoff
, bs
))
3652 /* verify if ranges are overlapped within the same file */
3654 if (destoff
+ len
> off
&& destoff
< off
+ len
)
3658 if (destoff
> inode
->i_size
) {
3659 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
3665 * Lock the target range too. Right after we replace the file extent
3666 * items in the fs tree (which now point to the cloned data), we might
3667 * have a worker replace them with extent items relative to a write
3668 * operation that was issued before this clone operation (i.e. confront
3669 * with inode.c:btrfs_finish_ordered_io).
3672 u64 lock_start
= min_t(u64
, off
, destoff
);
3673 u64 lock_len
= max_t(u64
, off
, destoff
) + len
- lock_start
;
3675 lock_extent_range(src
, lock_start
, lock_len
);
3677 lock_extent_range(src
, off
, len
);
3678 lock_extent_range(inode
, destoff
, len
);
3681 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
);
3684 u64 lock_start
= min_t(u64
, off
, destoff
);
3685 u64 lock_end
= max_t(u64
, off
, destoff
) + len
- 1;
3687 unlock_extent(&BTRFS_I(src
)->io_tree
, lock_start
, lock_end
);
3689 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+ len
- 1);
3690 unlock_extent(&BTRFS_I(inode
)->io_tree
, destoff
,
3694 * Truncate page cache pages so that future reads will see the cloned
3695 * data immediately and not the previous data.
3697 truncate_inode_pages_range(&inode
->i_data
, destoff
,
3698 PAGE_CACHE_ALIGN(destoff
+ len
) - 1);
3702 mutex_unlock(&src
->i_mutex
);
3703 mutex_unlock(&inode
->i_mutex
);
3705 mutex_unlock(&inode
->i_mutex
);
3706 mutex_unlock(&src
->i_mutex
);
3709 mutex_unlock(&src
->i_mutex
);
3714 mnt_drop_write_file(file
);
3718 static long btrfs_ioctl_clone_range(struct file
*file
, void __user
*argp
)
3720 struct btrfs_ioctl_clone_range_args args
;
3722 if (copy_from_user(&args
, argp
, sizeof(args
)))
3724 return btrfs_ioctl_clone(file
, args
.src_fd
, args
.src_offset
,
3725 args
.src_length
, args
.dest_offset
);
3729 * there are many ways the trans_start and trans_end ioctls can lead
3730 * to deadlocks. They should only be used by applications that
3731 * basically own the machine, and have a very in depth understanding
3732 * of all the possible deadlocks and enospc problems.
3734 static long btrfs_ioctl_trans_start(struct file
*file
)
3736 struct inode
*inode
= file_inode(file
);
3737 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3738 struct btrfs_trans_handle
*trans
;
3742 if (!capable(CAP_SYS_ADMIN
))
3746 if (file
->private_data
)
3750 if (btrfs_root_readonly(root
))
3753 ret
= mnt_want_write_file(file
);
3757 atomic_inc(&root
->fs_info
->open_ioctl_trans
);
3760 trans
= btrfs_start_ioctl_transaction(root
);
3764 file
->private_data
= trans
;
3768 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3769 mnt_drop_write_file(file
);
3774 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3776 struct inode
*inode
= file_inode(file
);
3777 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3778 struct btrfs_root
*new_root
;
3779 struct btrfs_dir_item
*di
;
3780 struct btrfs_trans_handle
*trans
;
3781 struct btrfs_path
*path
;
3782 struct btrfs_key location
;
3783 struct btrfs_disk_key disk_key
;
3788 if (!capable(CAP_SYS_ADMIN
))
3791 ret
= mnt_want_write_file(file
);
3795 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3801 objectid
= BTRFS_FS_TREE_OBJECTID
;
3803 location
.objectid
= objectid
;
3804 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3805 location
.offset
= (u64
)-1;
3807 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
3808 if (IS_ERR(new_root
)) {
3809 ret
= PTR_ERR(new_root
);
3813 path
= btrfs_alloc_path();
3818 path
->leave_spinning
= 1;
3820 trans
= btrfs_start_transaction(root
, 1);
3821 if (IS_ERR(trans
)) {
3822 btrfs_free_path(path
);
3823 ret
= PTR_ERR(trans
);
3827 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
3828 di
= btrfs_lookup_dir_item(trans
, root
->fs_info
->tree_root
, path
,
3829 dir_id
, "default", 7, 1);
3830 if (IS_ERR_OR_NULL(di
)) {
3831 btrfs_free_path(path
);
3832 btrfs_end_transaction(trans
, root
);
3833 btrfs_err(new_root
->fs_info
, "Umm, you don't have the default dir"
3834 "item, this isn't going to work");
3839 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3840 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3841 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3842 btrfs_free_path(path
);
3844 btrfs_set_fs_incompat(root
->fs_info
, DEFAULT_SUBVOL
);
3845 btrfs_end_transaction(trans
, root
);
3847 mnt_drop_write_file(file
);
3851 void btrfs_get_block_group_info(struct list_head
*groups_list
,
3852 struct btrfs_ioctl_space_info
*space
)
3854 struct btrfs_block_group_cache
*block_group
;
3856 space
->total_bytes
= 0;
3857 space
->used_bytes
= 0;
3859 list_for_each_entry(block_group
, groups_list
, list
) {
3860 space
->flags
= block_group
->flags
;
3861 space
->total_bytes
+= block_group
->key
.offset
;
3862 space
->used_bytes
+=
3863 btrfs_block_group_used(&block_group
->item
);
3867 static long btrfs_ioctl_space_info(struct btrfs_root
*root
, void __user
*arg
)
3869 struct btrfs_ioctl_space_args space_args
;
3870 struct btrfs_ioctl_space_info space
;
3871 struct btrfs_ioctl_space_info
*dest
;
3872 struct btrfs_ioctl_space_info
*dest_orig
;
3873 struct btrfs_ioctl_space_info __user
*user_dest
;
3874 struct btrfs_space_info
*info
;
3875 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3876 BTRFS_BLOCK_GROUP_SYSTEM
,
3877 BTRFS_BLOCK_GROUP_METADATA
,
3878 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3885 if (copy_from_user(&space_args
,
3886 (struct btrfs_ioctl_space_args __user
*)arg
,
3887 sizeof(space_args
)))
3890 for (i
= 0; i
< num_types
; i
++) {
3891 struct btrfs_space_info
*tmp
;
3895 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3897 if (tmp
->flags
== types
[i
]) {
3907 down_read(&info
->groups_sem
);
3908 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3909 if (!list_empty(&info
->block_groups
[c
]))
3912 up_read(&info
->groups_sem
);
3916 * Global block reserve, exported as a space_info
3920 /* space_slots == 0 means they are asking for a count */
3921 if (space_args
.space_slots
== 0) {
3922 space_args
.total_spaces
= slot_count
;
3926 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
3928 alloc_size
= sizeof(*dest
) * slot_count
;
3930 /* we generally have at most 6 or so space infos, one for each raid
3931 * level. So, a whole page should be more than enough for everyone
3933 if (alloc_size
> PAGE_CACHE_SIZE
)
3936 space_args
.total_spaces
= 0;
3937 dest
= kmalloc(alloc_size
, GFP_NOFS
);
3942 /* now we have a buffer to copy into */
3943 for (i
= 0; i
< num_types
; i
++) {
3944 struct btrfs_space_info
*tmp
;
3951 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3953 if (tmp
->flags
== types
[i
]) {
3962 down_read(&info
->groups_sem
);
3963 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3964 if (!list_empty(&info
->block_groups
[c
])) {
3965 btrfs_get_block_group_info(
3966 &info
->block_groups
[c
], &space
);
3967 memcpy(dest
, &space
, sizeof(space
));
3969 space_args
.total_spaces
++;
3975 up_read(&info
->groups_sem
);
3979 * Add global block reserve
3982 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->global_block_rsv
;
3984 spin_lock(&block_rsv
->lock
);
3985 space
.total_bytes
= block_rsv
->size
;
3986 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
3987 spin_unlock(&block_rsv
->lock
);
3988 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
3989 memcpy(dest
, &space
, sizeof(space
));
3990 space_args
.total_spaces
++;
3993 user_dest
= (struct btrfs_ioctl_space_info __user
*)
3994 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
3996 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
4001 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
4008 * there are many ways the trans_start and trans_end ioctls can lead
4009 * to deadlocks. They should only be used by applications that
4010 * basically own the machine, and have a very in depth understanding
4011 * of all the possible deadlocks and enospc problems.
4013 long btrfs_ioctl_trans_end(struct file
*file
)
4015 struct inode
*inode
= file_inode(file
);
4016 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4017 struct btrfs_trans_handle
*trans
;
4019 trans
= file
->private_data
;
4022 file
->private_data
= NULL
;
4024 btrfs_end_transaction(trans
, root
);
4026 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
4028 mnt_drop_write_file(file
);
4032 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
4035 struct btrfs_trans_handle
*trans
;
4039 trans
= btrfs_attach_transaction_barrier(root
);
4040 if (IS_ERR(trans
)) {
4041 if (PTR_ERR(trans
) != -ENOENT
)
4042 return PTR_ERR(trans
);
4044 /* No running transaction, don't bother */
4045 transid
= root
->fs_info
->last_trans_committed
;
4048 transid
= trans
->transid
;
4049 ret
= btrfs_commit_transaction_async(trans
, root
, 0);
4051 btrfs_end_transaction(trans
, root
);
4056 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
4061 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_root
*root
,
4067 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
4070 transid
= 0; /* current trans */
4072 return btrfs_wait_for_commit(root
, transid
);
4075 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
4077 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4078 struct btrfs_ioctl_scrub_args
*sa
;
4081 if (!capable(CAP_SYS_ADMIN
))
4084 sa
= memdup_user(arg
, sizeof(*sa
));
4088 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
4089 ret
= mnt_want_write_file(file
);
4094 ret
= btrfs_scrub_dev(root
->fs_info
, sa
->devid
, sa
->start
, sa
->end
,
4095 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
4098 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4101 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
4102 mnt_drop_write_file(file
);
4108 static long btrfs_ioctl_scrub_cancel(struct btrfs_root
*root
, void __user
*arg
)
4110 if (!capable(CAP_SYS_ADMIN
))
4113 return btrfs_scrub_cancel(root
->fs_info
);
4116 static long btrfs_ioctl_scrub_progress(struct btrfs_root
*root
,
4119 struct btrfs_ioctl_scrub_args
*sa
;
4122 if (!capable(CAP_SYS_ADMIN
))
4125 sa
= memdup_user(arg
, sizeof(*sa
));
4129 ret
= btrfs_scrub_progress(root
, sa
->devid
, &sa
->progress
);
4131 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4138 static long btrfs_ioctl_get_dev_stats(struct btrfs_root
*root
,
4141 struct btrfs_ioctl_get_dev_stats
*sa
;
4144 sa
= memdup_user(arg
, sizeof(*sa
));
4148 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
4153 ret
= btrfs_get_dev_stats(root
, sa
);
4155 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4162 static long btrfs_ioctl_dev_replace(struct btrfs_root
*root
, void __user
*arg
)
4164 struct btrfs_ioctl_dev_replace_args
*p
;
4167 if (!capable(CAP_SYS_ADMIN
))
4170 p
= memdup_user(arg
, sizeof(*p
));
4175 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
4176 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
) {
4181 &root
->fs_info
->mutually_exclusive_operation_running
,
4183 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4185 ret
= btrfs_dev_replace_start(root
, p
);
4187 &root
->fs_info
->mutually_exclusive_operation_running
,
4191 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
4192 btrfs_dev_replace_status(root
->fs_info
, p
);
4195 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
4196 ret
= btrfs_dev_replace_cancel(root
->fs_info
, p
);
4203 if (copy_to_user(arg
, p
, sizeof(*p
)))
4210 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
4216 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
4217 struct inode_fs_paths
*ipath
= NULL
;
4218 struct btrfs_path
*path
;
4220 if (!capable(CAP_DAC_READ_SEARCH
))
4223 path
= btrfs_alloc_path();
4229 ipa
= memdup_user(arg
, sizeof(*ipa
));
4236 size
= min_t(u32
, ipa
->size
, 4096);
4237 ipath
= init_ipath(size
, root
, path
);
4238 if (IS_ERR(ipath
)) {
4239 ret
= PTR_ERR(ipath
);
4244 ret
= paths_from_inode(ipa
->inum
, ipath
);
4248 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
4249 rel_ptr
= ipath
->fspath
->val
[i
] -
4250 (u64
)(unsigned long)ipath
->fspath
->val
;
4251 ipath
->fspath
->val
[i
] = rel_ptr
;
4254 ret
= copy_to_user((void *)(unsigned long)ipa
->fspath
,
4255 (void *)(unsigned long)ipath
->fspath
, size
);
4262 btrfs_free_path(path
);
4269 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
4271 struct btrfs_data_container
*inodes
= ctx
;
4272 const size_t c
= 3 * sizeof(u64
);
4274 if (inodes
->bytes_left
>= c
) {
4275 inodes
->bytes_left
-= c
;
4276 inodes
->val
[inodes
->elem_cnt
] = inum
;
4277 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
4278 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
4279 inodes
->elem_cnt
+= 3;
4281 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
4282 inodes
->bytes_left
= 0;
4283 inodes
->elem_missed
+= 3;
4289 static long btrfs_ioctl_logical_to_ino(struct btrfs_root
*root
,
4294 struct btrfs_ioctl_logical_ino_args
*loi
;
4295 struct btrfs_data_container
*inodes
= NULL
;
4296 struct btrfs_path
*path
= NULL
;
4298 if (!capable(CAP_SYS_ADMIN
))
4301 loi
= memdup_user(arg
, sizeof(*loi
));
4308 path
= btrfs_alloc_path();
4314 size
= min_t(u32
, loi
->size
, 64 * 1024);
4315 inodes
= init_data_container(size
);
4316 if (IS_ERR(inodes
)) {
4317 ret
= PTR_ERR(inodes
);
4322 ret
= iterate_inodes_from_logical(loi
->logical
, root
->fs_info
, path
,
4323 build_ino_list
, inodes
);
4329 ret
= copy_to_user((void *)(unsigned long)loi
->inodes
,
4330 (void *)(unsigned long)inodes
, size
);
4335 btrfs_free_path(path
);
4342 void update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
, int lock
,
4343 struct btrfs_ioctl_balance_args
*bargs
)
4345 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4347 bargs
->flags
= bctl
->flags
;
4349 if (atomic_read(&fs_info
->balance_running
))
4350 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
4351 if (atomic_read(&fs_info
->balance_pause_req
))
4352 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
4353 if (atomic_read(&fs_info
->balance_cancel_req
))
4354 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
4356 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
4357 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
4358 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
4361 spin_lock(&fs_info
->balance_lock
);
4362 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4363 spin_unlock(&fs_info
->balance_lock
);
4365 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4369 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
4371 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4372 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4373 struct btrfs_ioctl_balance_args
*bargs
;
4374 struct btrfs_balance_control
*bctl
;
4375 bool need_unlock
; /* for mut. excl. ops lock */
4378 if (!capable(CAP_SYS_ADMIN
))
4381 ret
= mnt_want_write_file(file
);
4386 if (!atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
4387 mutex_lock(&fs_info
->volume_mutex
);
4388 mutex_lock(&fs_info
->balance_mutex
);
4394 * mut. excl. ops lock is locked. Three possibilites:
4395 * (1) some other op is running
4396 * (2) balance is running
4397 * (3) balance is paused -- special case (think resume)
4399 mutex_lock(&fs_info
->balance_mutex
);
4400 if (fs_info
->balance_ctl
) {
4401 /* this is either (2) or (3) */
4402 if (!atomic_read(&fs_info
->balance_running
)) {
4403 mutex_unlock(&fs_info
->balance_mutex
);
4404 if (!mutex_trylock(&fs_info
->volume_mutex
))
4406 mutex_lock(&fs_info
->balance_mutex
);
4408 if (fs_info
->balance_ctl
&&
4409 !atomic_read(&fs_info
->balance_running
)) {
4411 need_unlock
= false;
4415 mutex_unlock(&fs_info
->balance_mutex
);
4416 mutex_unlock(&fs_info
->volume_mutex
);
4420 mutex_unlock(&fs_info
->balance_mutex
);
4426 mutex_unlock(&fs_info
->balance_mutex
);
4427 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4432 BUG_ON(!atomic_read(&fs_info
->mutually_exclusive_operation_running
));
4435 bargs
= memdup_user(arg
, sizeof(*bargs
));
4436 if (IS_ERR(bargs
)) {
4437 ret
= PTR_ERR(bargs
);
4441 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
4442 if (!fs_info
->balance_ctl
) {
4447 bctl
= fs_info
->balance_ctl
;
4448 spin_lock(&fs_info
->balance_lock
);
4449 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4450 spin_unlock(&fs_info
->balance_lock
);
4458 if (fs_info
->balance_ctl
) {
4463 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
4469 bctl
->fs_info
= fs_info
;
4471 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4472 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4473 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4475 bctl
->flags
= bargs
->flags
;
4477 /* balance everything - no filters */
4478 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4483 * Ownership of bctl and mutually_exclusive_operation_running
4484 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4485 * or, if restriper was paused all the way until unmount, in
4486 * free_fs_info. mutually_exclusive_operation_running is
4487 * cleared in __cancel_balance.
4489 need_unlock
= false;
4491 ret
= btrfs_balance(bctl
, bargs
);
4494 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4501 mutex_unlock(&fs_info
->balance_mutex
);
4502 mutex_unlock(&fs_info
->volume_mutex
);
4504 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
4506 mnt_drop_write_file(file
);
4510 static long btrfs_ioctl_balance_ctl(struct btrfs_root
*root
, int cmd
)
4512 if (!capable(CAP_SYS_ADMIN
))
4516 case BTRFS_BALANCE_CTL_PAUSE
:
4517 return btrfs_pause_balance(root
->fs_info
);
4518 case BTRFS_BALANCE_CTL_CANCEL
:
4519 return btrfs_cancel_balance(root
->fs_info
);
4525 static long btrfs_ioctl_balance_progress(struct btrfs_root
*root
,
4528 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4529 struct btrfs_ioctl_balance_args
*bargs
;
4532 if (!capable(CAP_SYS_ADMIN
))
4535 mutex_lock(&fs_info
->balance_mutex
);
4536 if (!fs_info
->balance_ctl
) {
4541 bargs
= kzalloc(sizeof(*bargs
), GFP_NOFS
);
4547 update_ioctl_balance_args(fs_info
, 1, bargs
);
4549 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4554 mutex_unlock(&fs_info
->balance_mutex
);
4558 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4560 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4561 struct btrfs_ioctl_quota_ctl_args
*sa
;
4562 struct btrfs_trans_handle
*trans
= NULL
;
4566 if (!capable(CAP_SYS_ADMIN
))
4569 ret
= mnt_want_write_file(file
);
4573 sa
= memdup_user(arg
, sizeof(*sa
));
4579 down_write(&root
->fs_info
->subvol_sem
);
4580 trans
= btrfs_start_transaction(root
->fs_info
->tree_root
, 2);
4581 if (IS_ERR(trans
)) {
4582 ret
= PTR_ERR(trans
);
4587 case BTRFS_QUOTA_CTL_ENABLE
:
4588 ret
= btrfs_quota_enable(trans
, root
->fs_info
);
4590 case BTRFS_QUOTA_CTL_DISABLE
:
4591 ret
= btrfs_quota_disable(trans
, root
->fs_info
);
4598 err
= btrfs_commit_transaction(trans
, root
->fs_info
->tree_root
);
4603 up_write(&root
->fs_info
->subvol_sem
);
4605 mnt_drop_write_file(file
);
4609 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4611 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4612 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4613 struct btrfs_trans_handle
*trans
;
4617 if (!capable(CAP_SYS_ADMIN
))
4620 ret
= mnt_want_write_file(file
);
4624 sa
= memdup_user(arg
, sizeof(*sa
));
4630 trans
= btrfs_join_transaction(root
);
4631 if (IS_ERR(trans
)) {
4632 ret
= PTR_ERR(trans
);
4636 /* FIXME: check if the IDs really exist */
4638 ret
= btrfs_add_qgroup_relation(trans
, root
->fs_info
,
4641 ret
= btrfs_del_qgroup_relation(trans
, root
->fs_info
,
4645 /* update qgroup status and info */
4646 err
= btrfs_run_qgroups(trans
, root
->fs_info
);
4648 btrfs_error(root
->fs_info
, ret
,
4649 "failed to update qgroup status and info\n");
4650 err
= btrfs_end_transaction(trans
, root
);
4657 mnt_drop_write_file(file
);
4661 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4663 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4664 struct btrfs_ioctl_qgroup_create_args
*sa
;
4665 struct btrfs_trans_handle
*trans
;
4669 if (!capable(CAP_SYS_ADMIN
))
4672 ret
= mnt_want_write_file(file
);
4676 sa
= memdup_user(arg
, sizeof(*sa
));
4682 if (!sa
->qgroupid
) {
4687 trans
= btrfs_join_transaction(root
);
4688 if (IS_ERR(trans
)) {
4689 ret
= PTR_ERR(trans
);
4693 /* FIXME: check if the IDs really exist */
4695 ret
= btrfs_create_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4697 ret
= btrfs_remove_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4700 err
= btrfs_end_transaction(trans
, root
);
4707 mnt_drop_write_file(file
);
4711 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4713 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4714 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4715 struct btrfs_trans_handle
*trans
;
4720 if (!capable(CAP_SYS_ADMIN
))
4723 ret
= mnt_want_write_file(file
);
4727 sa
= memdup_user(arg
, sizeof(*sa
));
4733 trans
= btrfs_join_transaction(root
);
4734 if (IS_ERR(trans
)) {
4735 ret
= PTR_ERR(trans
);
4739 qgroupid
= sa
->qgroupid
;
4741 /* take the current subvol as qgroup */
4742 qgroupid
= root
->root_key
.objectid
;
4745 /* FIXME: check if the IDs really exist */
4746 ret
= btrfs_limit_qgroup(trans
, root
->fs_info
, qgroupid
, &sa
->lim
);
4748 err
= btrfs_end_transaction(trans
, root
);
4755 mnt_drop_write_file(file
);
4759 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4761 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4762 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4765 if (!capable(CAP_SYS_ADMIN
))
4768 ret
= mnt_want_write_file(file
);
4772 qsa
= memdup_user(arg
, sizeof(*qsa
));
4783 ret
= btrfs_qgroup_rescan(root
->fs_info
);
4788 mnt_drop_write_file(file
);
4792 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
4794 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4795 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4798 if (!capable(CAP_SYS_ADMIN
))
4801 qsa
= kzalloc(sizeof(*qsa
), GFP_NOFS
);
4805 if (root
->fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4807 qsa
->progress
= root
->fs_info
->qgroup_rescan_progress
.objectid
;
4810 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
4817 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
4819 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4821 if (!capable(CAP_SYS_ADMIN
))
4824 return btrfs_qgroup_wait_for_completion(root
->fs_info
);
4827 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
4828 struct btrfs_ioctl_received_subvol_args
*sa
)
4830 struct inode
*inode
= file_inode(file
);
4831 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4832 struct btrfs_root_item
*root_item
= &root
->root_item
;
4833 struct btrfs_trans_handle
*trans
;
4834 struct timespec ct
= CURRENT_TIME
;
4836 int received_uuid_changed
;
4838 if (!inode_owner_or_capable(inode
))
4841 ret
= mnt_want_write_file(file
);
4845 down_write(&root
->fs_info
->subvol_sem
);
4847 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
4852 if (btrfs_root_readonly(root
)) {
4859 * 2 - uuid items (received uuid + subvol uuid)
4861 trans
= btrfs_start_transaction(root
, 3);
4862 if (IS_ERR(trans
)) {
4863 ret
= PTR_ERR(trans
);
4868 sa
->rtransid
= trans
->transid
;
4869 sa
->rtime
.sec
= ct
.tv_sec
;
4870 sa
->rtime
.nsec
= ct
.tv_nsec
;
4872 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4874 if (received_uuid_changed
&&
4875 !btrfs_is_empty_uuid(root_item
->received_uuid
))
4876 btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
4877 root_item
->received_uuid
,
4878 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4879 root
->root_key
.objectid
);
4880 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4881 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4882 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4883 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4884 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4885 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4886 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
4888 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
4889 &root
->root_key
, &root
->root_item
);
4891 btrfs_end_transaction(trans
, root
);
4894 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
4895 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
4897 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4898 root
->root_key
.objectid
);
4899 if (ret
< 0 && ret
!= -EEXIST
) {
4900 btrfs_abort_transaction(trans
, root
, ret
);
4904 ret
= btrfs_commit_transaction(trans
, root
);
4906 btrfs_abort_transaction(trans
, root
, ret
);
4911 up_write(&root
->fs_info
->subvol_sem
);
4912 mnt_drop_write_file(file
);
4917 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
4920 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
4921 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
4924 args32
= memdup_user(arg
, sizeof(*args32
));
4925 if (IS_ERR(args32
)) {
4926 ret
= PTR_ERR(args32
);
4931 args64
= kmalloc(sizeof(*args64
), GFP_NOFS
);
4937 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
4938 args64
->stransid
= args32
->stransid
;
4939 args64
->rtransid
= args32
->rtransid
;
4940 args64
->stime
.sec
= args32
->stime
.sec
;
4941 args64
->stime
.nsec
= args32
->stime
.nsec
;
4942 args64
->rtime
.sec
= args32
->rtime
.sec
;
4943 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
4944 args64
->flags
= args32
->flags
;
4946 ret
= _btrfs_ioctl_set_received_subvol(file
, args64
);
4950 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
4951 args32
->stransid
= args64
->stransid
;
4952 args32
->rtransid
= args64
->rtransid
;
4953 args32
->stime
.sec
= args64
->stime
.sec
;
4954 args32
->stime
.nsec
= args64
->stime
.nsec
;
4955 args32
->rtime
.sec
= args64
->rtime
.sec
;
4956 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
4957 args32
->flags
= args64
->flags
;
4959 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
4970 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
4973 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
4976 sa
= memdup_user(arg
, sizeof(*sa
));
4983 ret
= _btrfs_ioctl_set_received_subvol(file
, sa
);
4988 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
4997 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
4999 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5002 char label
[BTRFS_LABEL_SIZE
];
5004 spin_lock(&root
->fs_info
->super_lock
);
5005 memcpy(label
, root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
5006 spin_unlock(&root
->fs_info
->super_lock
);
5008 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
5010 if (len
== BTRFS_LABEL_SIZE
) {
5011 btrfs_warn(root
->fs_info
,
5012 "label is too long, return the first %zu bytes", --len
);
5015 ret
= copy_to_user(arg
, label
, len
);
5017 return ret
? -EFAULT
: 0;
5020 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
5022 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5023 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5024 struct btrfs_trans_handle
*trans
;
5025 char label
[BTRFS_LABEL_SIZE
];
5028 if (!capable(CAP_SYS_ADMIN
))
5031 if (copy_from_user(label
, arg
, sizeof(label
)))
5034 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
5035 btrfs_err(root
->fs_info
, "unable to set label with more than %d bytes",
5036 BTRFS_LABEL_SIZE
- 1);
5040 ret
= mnt_want_write_file(file
);
5044 trans
= btrfs_start_transaction(root
, 0);
5045 if (IS_ERR(trans
)) {
5046 ret
= PTR_ERR(trans
);
5050 spin_lock(&root
->fs_info
->super_lock
);
5051 strcpy(super_block
->label
, label
);
5052 spin_unlock(&root
->fs_info
->super_lock
);
5053 ret
= btrfs_commit_transaction(trans
, root
);
5056 mnt_drop_write_file(file
);
5060 #define INIT_FEATURE_FLAGS(suffix) \
5061 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5062 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5063 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5065 static int btrfs_ioctl_get_supported_features(struct file
*file
,
5068 static struct btrfs_ioctl_feature_flags features
[3] = {
5069 INIT_FEATURE_FLAGS(SUPP
),
5070 INIT_FEATURE_FLAGS(SAFE_SET
),
5071 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
5074 if (copy_to_user(arg
, &features
, sizeof(features
)))
5080 static int btrfs_ioctl_get_features(struct file
*file
, void __user
*arg
)
5082 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5083 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5084 struct btrfs_ioctl_feature_flags features
;
5086 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
5087 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
5088 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
5090 if (copy_to_user(arg
, &features
, sizeof(features
)))
5096 static int check_feature_bits(struct btrfs_root
*root
,
5097 enum btrfs_feature_set set
,
5098 u64 change_mask
, u64 flags
, u64 supported_flags
,
5099 u64 safe_set
, u64 safe_clear
)
5101 const char *type
= btrfs_feature_set_names
[set
];
5103 u64 disallowed
, unsupported
;
5104 u64 set_mask
= flags
& change_mask
;
5105 u64 clear_mask
= ~flags
& change_mask
;
5107 unsupported
= set_mask
& ~supported_flags
;
5109 names
= btrfs_printable_features(set
, unsupported
);
5111 btrfs_warn(root
->fs_info
,
5112 "this kernel does not support the %s feature bit%s",
5113 names
, strchr(names
, ',') ? "s" : "");
5116 btrfs_warn(root
->fs_info
,
5117 "this kernel does not support %s bits 0x%llx",
5122 disallowed
= set_mask
& ~safe_set
;
5124 names
= btrfs_printable_features(set
, disallowed
);
5126 btrfs_warn(root
->fs_info
,
5127 "can't set the %s feature bit%s while mounted",
5128 names
, strchr(names
, ',') ? "s" : "");
5131 btrfs_warn(root
->fs_info
,
5132 "can't set %s bits 0x%llx while mounted",
5137 disallowed
= clear_mask
& ~safe_clear
;
5139 names
= btrfs_printable_features(set
, disallowed
);
5141 btrfs_warn(root
->fs_info
,
5142 "can't clear the %s feature bit%s while mounted",
5143 names
, strchr(names
, ',') ? "s" : "");
5146 btrfs_warn(root
->fs_info
,
5147 "can't clear %s bits 0x%llx while mounted",
5155 #define check_feature(root, change_mask, flags, mask_base) \
5156 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5157 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5158 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5159 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5161 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
5163 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5164 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5165 struct btrfs_ioctl_feature_flags flags
[2];
5166 struct btrfs_trans_handle
*trans
;
5170 if (!capable(CAP_SYS_ADMIN
))
5173 if (copy_from_user(flags
, arg
, sizeof(flags
)))
5177 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
5178 !flags
[0].incompat_flags
)
5181 ret
= check_feature(root
, flags
[0].compat_flags
,
5182 flags
[1].compat_flags
, COMPAT
);
5186 ret
= check_feature(root
, flags
[0].compat_ro_flags
,
5187 flags
[1].compat_ro_flags
, COMPAT_RO
);
5191 ret
= check_feature(root
, flags
[0].incompat_flags
,
5192 flags
[1].incompat_flags
, INCOMPAT
);
5196 trans
= btrfs_start_transaction(root
, 0);
5198 return PTR_ERR(trans
);
5200 spin_lock(&root
->fs_info
->super_lock
);
5201 newflags
= btrfs_super_compat_flags(super_block
);
5202 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
5203 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
5204 btrfs_set_super_compat_flags(super_block
, newflags
);
5206 newflags
= btrfs_super_compat_ro_flags(super_block
);
5207 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
5208 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
5209 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
5211 newflags
= btrfs_super_incompat_flags(super_block
);
5212 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
5213 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
5214 btrfs_set_super_incompat_flags(super_block
, newflags
);
5215 spin_unlock(&root
->fs_info
->super_lock
);
5217 return btrfs_commit_transaction(trans
, root
);
5220 long btrfs_ioctl(struct file
*file
, unsigned int
5221 cmd
, unsigned long arg
)
5223 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5224 void __user
*argp
= (void __user
*)arg
;
5227 case FS_IOC_GETFLAGS
:
5228 return btrfs_ioctl_getflags(file
, argp
);
5229 case FS_IOC_SETFLAGS
:
5230 return btrfs_ioctl_setflags(file
, argp
);
5231 case FS_IOC_GETVERSION
:
5232 return btrfs_ioctl_getversion(file
, argp
);
5234 return btrfs_ioctl_fitrim(file
, argp
);
5235 case BTRFS_IOC_SNAP_CREATE
:
5236 return btrfs_ioctl_snap_create(file
, argp
, 0);
5237 case BTRFS_IOC_SNAP_CREATE_V2
:
5238 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
5239 case BTRFS_IOC_SUBVOL_CREATE
:
5240 return btrfs_ioctl_snap_create(file
, argp
, 1);
5241 case BTRFS_IOC_SUBVOL_CREATE_V2
:
5242 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
5243 case BTRFS_IOC_SNAP_DESTROY
:
5244 return btrfs_ioctl_snap_destroy(file
, argp
);
5245 case BTRFS_IOC_SUBVOL_GETFLAGS
:
5246 return btrfs_ioctl_subvol_getflags(file
, argp
);
5247 case BTRFS_IOC_SUBVOL_SETFLAGS
:
5248 return btrfs_ioctl_subvol_setflags(file
, argp
);
5249 case BTRFS_IOC_DEFAULT_SUBVOL
:
5250 return btrfs_ioctl_default_subvol(file
, argp
);
5251 case BTRFS_IOC_DEFRAG
:
5252 return btrfs_ioctl_defrag(file
, NULL
);
5253 case BTRFS_IOC_DEFRAG_RANGE
:
5254 return btrfs_ioctl_defrag(file
, argp
);
5255 case BTRFS_IOC_RESIZE
:
5256 return btrfs_ioctl_resize(file
, argp
);
5257 case BTRFS_IOC_ADD_DEV
:
5258 return btrfs_ioctl_add_dev(root
, argp
);
5259 case BTRFS_IOC_RM_DEV
:
5260 return btrfs_ioctl_rm_dev(file
, argp
);
5261 case BTRFS_IOC_FS_INFO
:
5262 return btrfs_ioctl_fs_info(root
, argp
);
5263 case BTRFS_IOC_DEV_INFO
:
5264 return btrfs_ioctl_dev_info(root
, argp
);
5265 case BTRFS_IOC_BALANCE
:
5266 return btrfs_ioctl_balance(file
, NULL
);
5267 case BTRFS_IOC_CLONE
:
5268 return btrfs_ioctl_clone(file
, arg
, 0, 0, 0);
5269 case BTRFS_IOC_CLONE_RANGE
:
5270 return btrfs_ioctl_clone_range(file
, argp
);
5271 case BTRFS_IOC_TRANS_START
:
5272 return btrfs_ioctl_trans_start(file
);
5273 case BTRFS_IOC_TRANS_END
:
5274 return btrfs_ioctl_trans_end(file
);
5275 case BTRFS_IOC_TREE_SEARCH
:
5276 return btrfs_ioctl_tree_search(file
, argp
);
5277 case BTRFS_IOC_TREE_SEARCH_V2
:
5278 return btrfs_ioctl_tree_search_v2(file
, argp
);
5279 case BTRFS_IOC_INO_LOOKUP
:
5280 return btrfs_ioctl_ino_lookup(file
, argp
);
5281 case BTRFS_IOC_INO_PATHS
:
5282 return btrfs_ioctl_ino_to_path(root
, argp
);
5283 case BTRFS_IOC_LOGICAL_INO
:
5284 return btrfs_ioctl_logical_to_ino(root
, argp
);
5285 case BTRFS_IOC_SPACE_INFO
:
5286 return btrfs_ioctl_space_info(root
, argp
);
5287 case BTRFS_IOC_SYNC
: {
5290 ret
= btrfs_start_delalloc_roots(root
->fs_info
, 0, -1);
5293 ret
= btrfs_sync_fs(file_inode(file
)->i_sb
, 1);
5295 * The transaction thread may want to do more work,
5296 * namely it pokes the cleaner ktread that will start
5297 * processing uncleaned subvols.
5299 wake_up_process(root
->fs_info
->transaction_kthread
);
5302 case BTRFS_IOC_START_SYNC
:
5303 return btrfs_ioctl_start_sync(root
, argp
);
5304 case BTRFS_IOC_WAIT_SYNC
:
5305 return btrfs_ioctl_wait_sync(root
, argp
);
5306 case BTRFS_IOC_SCRUB
:
5307 return btrfs_ioctl_scrub(file
, argp
);
5308 case BTRFS_IOC_SCRUB_CANCEL
:
5309 return btrfs_ioctl_scrub_cancel(root
, argp
);
5310 case BTRFS_IOC_SCRUB_PROGRESS
:
5311 return btrfs_ioctl_scrub_progress(root
, argp
);
5312 case BTRFS_IOC_BALANCE_V2
:
5313 return btrfs_ioctl_balance(file
, argp
);
5314 case BTRFS_IOC_BALANCE_CTL
:
5315 return btrfs_ioctl_balance_ctl(root
, arg
);
5316 case BTRFS_IOC_BALANCE_PROGRESS
:
5317 return btrfs_ioctl_balance_progress(root
, argp
);
5318 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
5319 return btrfs_ioctl_set_received_subvol(file
, argp
);
5321 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
5322 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
5324 case BTRFS_IOC_SEND
:
5325 return btrfs_ioctl_send(file
, argp
);
5326 case BTRFS_IOC_GET_DEV_STATS
:
5327 return btrfs_ioctl_get_dev_stats(root
, argp
);
5328 case BTRFS_IOC_QUOTA_CTL
:
5329 return btrfs_ioctl_quota_ctl(file
, argp
);
5330 case BTRFS_IOC_QGROUP_ASSIGN
:
5331 return btrfs_ioctl_qgroup_assign(file
, argp
);
5332 case BTRFS_IOC_QGROUP_CREATE
:
5333 return btrfs_ioctl_qgroup_create(file
, argp
);
5334 case BTRFS_IOC_QGROUP_LIMIT
:
5335 return btrfs_ioctl_qgroup_limit(file
, argp
);
5336 case BTRFS_IOC_QUOTA_RESCAN
:
5337 return btrfs_ioctl_quota_rescan(file
, argp
);
5338 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
5339 return btrfs_ioctl_quota_rescan_status(file
, argp
);
5340 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
5341 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
5342 case BTRFS_IOC_DEV_REPLACE
:
5343 return btrfs_ioctl_dev_replace(root
, argp
);
5344 case BTRFS_IOC_GET_FSLABEL
:
5345 return btrfs_ioctl_get_fslabel(file
, argp
);
5346 case BTRFS_IOC_SET_FSLABEL
:
5347 return btrfs_ioctl_set_fslabel(file
, argp
);
5348 case BTRFS_IOC_FILE_EXTENT_SAME
:
5349 return btrfs_ioctl_file_extent_same(file
, argp
);
5350 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
5351 return btrfs_ioctl_get_supported_features(file
, argp
);
5352 case BTRFS_IOC_GET_FEATURES
:
5353 return btrfs_ioctl_get_features(file
, argp
);
5354 case BTRFS_IOC_SET_FEATURES
:
5355 return btrfs_ioctl_set_features(file
, argp
);