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
,
93 /* Mask out flags that are inappropriate for the given type of inode. */
94 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
98 else if (S_ISREG(mode
))
99 return flags
& ~FS_DIRSYNC_FL
;
101 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
105 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
107 static unsigned int btrfs_flags_to_ioctl(unsigned int flags
)
109 unsigned int iflags
= 0;
111 if (flags
& BTRFS_INODE_SYNC
)
112 iflags
|= FS_SYNC_FL
;
113 if (flags
& BTRFS_INODE_IMMUTABLE
)
114 iflags
|= FS_IMMUTABLE_FL
;
115 if (flags
& BTRFS_INODE_APPEND
)
116 iflags
|= FS_APPEND_FL
;
117 if (flags
& BTRFS_INODE_NODUMP
)
118 iflags
|= FS_NODUMP_FL
;
119 if (flags
& BTRFS_INODE_NOATIME
)
120 iflags
|= FS_NOATIME_FL
;
121 if (flags
& BTRFS_INODE_DIRSYNC
)
122 iflags
|= FS_DIRSYNC_FL
;
123 if (flags
& BTRFS_INODE_NODATACOW
)
124 iflags
|= FS_NOCOW_FL
;
126 if ((flags
& BTRFS_INODE_COMPRESS
) && !(flags
& BTRFS_INODE_NOCOMPRESS
))
127 iflags
|= FS_COMPR_FL
;
128 else if (flags
& BTRFS_INODE_NOCOMPRESS
)
129 iflags
|= FS_NOCOMP_FL
;
135 * Update inode->i_flags based on the btrfs internal flags.
137 void btrfs_update_iflags(struct inode
*inode
)
139 struct btrfs_inode
*ip
= BTRFS_I(inode
);
140 unsigned int new_fl
= 0;
142 if (ip
->flags
& BTRFS_INODE_SYNC
)
144 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
145 new_fl
|= S_IMMUTABLE
;
146 if (ip
->flags
& BTRFS_INODE_APPEND
)
148 if (ip
->flags
& BTRFS_INODE_NOATIME
)
150 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
153 set_mask_bits(&inode
->i_flags
,
154 S_SYNC
| S_APPEND
| S_IMMUTABLE
| S_NOATIME
| S_DIRSYNC
,
159 * Inherit flags from the parent inode.
161 * Currently only the compression flags and the cow flags are inherited.
163 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
170 flags
= BTRFS_I(dir
)->flags
;
172 if (flags
& BTRFS_INODE_NOCOMPRESS
) {
173 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_COMPRESS
;
174 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
175 } else if (flags
& BTRFS_INODE_COMPRESS
) {
176 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
177 BTRFS_I(inode
)->flags
|= BTRFS_INODE_COMPRESS
;
180 if (flags
& BTRFS_INODE_NODATACOW
) {
181 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
;
182 if (S_ISREG(inode
->i_mode
))
183 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
186 btrfs_update_iflags(inode
);
189 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
191 struct btrfs_inode
*ip
= BTRFS_I(file_inode(file
));
192 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
194 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
199 static int check_flags(unsigned int flags
)
201 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
202 FS_NOATIME_FL
| FS_NODUMP_FL
| \
203 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
204 FS_NOCOMP_FL
| FS_COMPR_FL
|
208 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
214 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
216 struct inode
*inode
= file_inode(file
);
217 struct btrfs_inode
*ip
= BTRFS_I(inode
);
218 struct btrfs_root
*root
= ip
->root
;
219 struct btrfs_trans_handle
*trans
;
220 unsigned int flags
, oldflags
;
223 unsigned int i_oldflags
;
226 if (!inode_owner_or_capable(inode
))
229 if (btrfs_root_readonly(root
))
232 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
235 ret
= check_flags(flags
);
239 ret
= mnt_want_write_file(file
);
243 mutex_lock(&inode
->i_mutex
);
245 ip_oldflags
= ip
->flags
;
246 i_oldflags
= inode
->i_flags
;
247 mode
= inode
->i_mode
;
249 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
250 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
251 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
252 if (!capable(CAP_LINUX_IMMUTABLE
)) {
258 if (flags
& FS_SYNC_FL
)
259 ip
->flags
|= BTRFS_INODE_SYNC
;
261 ip
->flags
&= ~BTRFS_INODE_SYNC
;
262 if (flags
& FS_IMMUTABLE_FL
)
263 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
265 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
266 if (flags
& FS_APPEND_FL
)
267 ip
->flags
|= BTRFS_INODE_APPEND
;
269 ip
->flags
&= ~BTRFS_INODE_APPEND
;
270 if (flags
& FS_NODUMP_FL
)
271 ip
->flags
|= BTRFS_INODE_NODUMP
;
273 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
274 if (flags
& FS_NOATIME_FL
)
275 ip
->flags
|= BTRFS_INODE_NOATIME
;
277 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
278 if (flags
& FS_DIRSYNC_FL
)
279 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
281 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
282 if (flags
& FS_NOCOW_FL
) {
285 * It's safe to turn csums off here, no extents exist.
286 * Otherwise we want the flag to reflect the real COW
287 * status of the file and will not set it.
289 if (inode
->i_size
== 0)
290 ip
->flags
|= BTRFS_INODE_NODATACOW
291 | BTRFS_INODE_NODATASUM
;
293 ip
->flags
|= BTRFS_INODE_NODATACOW
;
297 * Revert back under same assuptions as above
300 if (inode
->i_size
== 0)
301 ip
->flags
&= ~(BTRFS_INODE_NODATACOW
302 | BTRFS_INODE_NODATASUM
);
304 ip
->flags
&= ~BTRFS_INODE_NODATACOW
;
309 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
310 * flag may be changed automatically if compression code won't make
313 if (flags
& FS_NOCOMP_FL
) {
314 ip
->flags
&= ~BTRFS_INODE_COMPRESS
;
315 ip
->flags
|= BTRFS_INODE_NOCOMPRESS
;
317 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
318 if (ret
&& ret
!= -ENODATA
)
320 } else if (flags
& FS_COMPR_FL
) {
323 ip
->flags
|= BTRFS_INODE_COMPRESS
;
324 ip
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
326 if (root
->fs_info
->compress_type
== BTRFS_COMPRESS_LZO
)
330 ret
= btrfs_set_prop(inode
, "btrfs.compression",
331 comp
, strlen(comp
), 0);
336 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
337 if (ret
&& ret
!= -ENODATA
)
339 ip
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
342 trans
= btrfs_start_transaction(root
, 1);
344 ret
= PTR_ERR(trans
);
348 btrfs_update_iflags(inode
);
349 inode_inc_iversion(inode
);
350 inode
->i_ctime
= CURRENT_TIME
;
351 ret
= btrfs_update_inode(trans
, root
, inode
);
353 btrfs_end_transaction(trans
, root
);
356 ip
->flags
= ip_oldflags
;
357 inode
->i_flags
= i_oldflags
;
361 mutex_unlock(&inode
->i_mutex
);
362 mnt_drop_write_file(file
);
366 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
368 struct inode
*inode
= file_inode(file
);
370 return put_user(inode
->i_generation
, arg
);
373 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
375 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
376 struct btrfs_device
*device
;
377 struct request_queue
*q
;
378 struct fstrim_range range
;
379 u64 minlen
= ULLONG_MAX
;
381 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
384 if (!capable(CAP_SYS_ADMIN
))
388 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
392 q
= bdev_get_queue(device
->bdev
);
393 if (blk_queue_discard(q
)) {
395 minlen
= min((u64
)q
->limits
.discard_granularity
,
403 if (copy_from_user(&range
, arg
, sizeof(range
)))
405 if (range
.start
> total_bytes
||
406 range
.len
< fs_info
->sb
->s_blocksize
)
409 range
.len
= min(range
.len
, total_bytes
- range
.start
);
410 range
.minlen
= max(range
.minlen
, minlen
);
411 ret
= btrfs_trim_fs(fs_info
->tree_root
, &range
);
415 if (copy_to_user(arg
, &range
, sizeof(range
)))
421 int btrfs_is_empty_uuid(u8
*uuid
)
425 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
432 static noinline
int create_subvol(struct inode
*dir
,
433 struct dentry
*dentry
,
434 char *name
, int namelen
,
436 struct btrfs_qgroup_inherit
*inherit
)
438 struct btrfs_trans_handle
*trans
;
439 struct btrfs_key key
;
440 struct btrfs_root_item root_item
;
441 struct btrfs_inode_item
*inode_item
;
442 struct extent_buffer
*leaf
;
443 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
444 struct btrfs_root
*new_root
;
445 struct btrfs_block_rsv block_rsv
;
446 struct timespec cur_time
= CURRENT_TIME
;
451 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
456 ret
= btrfs_find_free_objectid(root
->fs_info
->tree_root
, &objectid
);
461 * Don't create subvolume whose level is not zero. Or qgroup will be
462 * screwed up since it assume subvolme qgroup's level to be 0.
464 if (btrfs_qgroup_level(objectid
))
467 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
469 * The same as the snapshot creation, please see the comment
470 * of create_snapshot().
472 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
473 8, &qgroup_reserved
, false);
477 trans
= btrfs_start_transaction(root
, 0);
479 ret
= PTR_ERR(trans
);
480 btrfs_subvolume_release_metadata(root
, &block_rsv
,
484 trans
->block_rsv
= &block_rsv
;
485 trans
->bytes_reserved
= block_rsv
.size
;
487 ret
= btrfs_qgroup_inherit(trans
, root
->fs_info
, 0, objectid
, inherit
);
491 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
497 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
498 btrfs_set_header_bytenr(leaf
, leaf
->start
);
499 btrfs_set_header_generation(leaf
, trans
->transid
);
500 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
501 btrfs_set_header_owner(leaf
, objectid
);
503 write_extent_buffer(leaf
, root
->fs_info
->fsid
, btrfs_header_fsid(),
505 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
506 btrfs_header_chunk_tree_uuid(leaf
),
508 btrfs_mark_buffer_dirty(leaf
);
510 memset(&root_item
, 0, sizeof(root_item
));
512 inode_item
= &root_item
.inode
;
513 btrfs_set_stack_inode_generation(inode_item
, 1);
514 btrfs_set_stack_inode_size(inode_item
, 3);
515 btrfs_set_stack_inode_nlink(inode_item
, 1);
516 btrfs_set_stack_inode_nbytes(inode_item
, root
->nodesize
);
517 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
519 btrfs_set_root_flags(&root_item
, 0);
520 btrfs_set_root_limit(&root_item
, 0);
521 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
523 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
524 btrfs_set_root_generation(&root_item
, trans
->transid
);
525 btrfs_set_root_level(&root_item
, 0);
526 btrfs_set_root_refs(&root_item
, 1);
527 btrfs_set_root_used(&root_item
, leaf
->len
);
528 btrfs_set_root_last_snapshot(&root_item
, 0);
530 btrfs_set_root_generation_v2(&root_item
,
531 btrfs_root_generation(&root_item
));
532 uuid_le_gen(&new_uuid
);
533 memcpy(root_item
.uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
534 btrfs_set_stack_timespec_sec(&root_item
.otime
, cur_time
.tv_sec
);
535 btrfs_set_stack_timespec_nsec(&root_item
.otime
, cur_time
.tv_nsec
);
536 root_item
.ctime
= root_item
.otime
;
537 btrfs_set_root_ctransid(&root_item
, trans
->transid
);
538 btrfs_set_root_otransid(&root_item
, trans
->transid
);
540 btrfs_tree_unlock(leaf
);
541 free_extent_buffer(leaf
);
544 btrfs_set_root_dirid(&root_item
, new_dirid
);
546 key
.objectid
= objectid
;
548 key
.type
= BTRFS_ROOT_ITEM_KEY
;
549 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
554 key
.offset
= (u64
)-1;
555 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
556 if (IS_ERR(new_root
)) {
557 ret
= PTR_ERR(new_root
);
558 btrfs_abort_transaction(trans
, root
, ret
);
562 btrfs_record_root_in_trans(trans
, new_root
);
564 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, new_dirid
);
566 /* We potentially lose an unused inode item here */
567 btrfs_abort_transaction(trans
, root
, ret
);
572 * insert the directory item
574 ret
= btrfs_set_inode_index(dir
, &index
);
576 btrfs_abort_transaction(trans
, root
, ret
);
580 ret
= btrfs_insert_dir_item(trans
, root
,
581 name
, namelen
, dir
, &key
,
582 BTRFS_FT_DIR
, index
);
584 btrfs_abort_transaction(trans
, root
, ret
);
588 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
589 ret
= btrfs_update_inode(trans
, root
, dir
);
592 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
593 objectid
, root
->root_key
.objectid
,
594 btrfs_ino(dir
), index
, name
, namelen
);
597 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
598 root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
601 btrfs_abort_transaction(trans
, root
, ret
);
604 trans
->block_rsv
= NULL
;
605 trans
->bytes_reserved
= 0;
606 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
609 *async_transid
= trans
->transid
;
610 err
= btrfs_commit_transaction_async(trans
, root
, 1);
612 err
= btrfs_commit_transaction(trans
, root
);
614 err
= btrfs_commit_transaction(trans
, root
);
620 inode
= btrfs_lookup_dentry(dir
, dentry
);
622 return PTR_ERR(inode
);
623 d_instantiate(dentry
, inode
);
628 static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root
*root
)
634 prepare_to_wait(&root
->subv_writers
->wait
, &wait
,
635 TASK_UNINTERRUPTIBLE
);
637 writers
= percpu_counter_sum(&root
->subv_writers
->counter
);
641 finish_wait(&root
->subv_writers
->wait
, &wait
);
645 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
646 struct dentry
*dentry
, char *name
, int namelen
,
647 u64
*async_transid
, bool readonly
,
648 struct btrfs_qgroup_inherit
*inherit
)
651 struct btrfs_pending_snapshot
*pending_snapshot
;
652 struct btrfs_trans_handle
*trans
;
655 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
658 atomic_inc(&root
->will_be_snapshoted
);
659 smp_mb__after_atomic();
660 btrfs_wait_for_no_snapshoting_writes(root
);
662 ret
= btrfs_start_delalloc_inodes(root
, 0);
666 btrfs_wait_ordered_extents(root
, -1);
668 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
669 if (!pending_snapshot
) {
674 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
675 BTRFS_BLOCK_RSV_TEMP
);
677 * 1 - parent dir inode
680 * 2 - root ref/backref
681 * 1 - root of snapshot
684 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
685 &pending_snapshot
->block_rsv
, 8,
686 &pending_snapshot
->qgroup_reserved
,
691 pending_snapshot
->dentry
= dentry
;
692 pending_snapshot
->root
= root
;
693 pending_snapshot
->readonly
= readonly
;
694 pending_snapshot
->dir
= dir
;
695 pending_snapshot
->inherit
= inherit
;
697 trans
= btrfs_start_transaction(root
, 0);
699 ret
= PTR_ERR(trans
);
703 spin_lock(&root
->fs_info
->trans_lock
);
704 list_add(&pending_snapshot
->list
,
705 &trans
->transaction
->pending_snapshots
);
706 spin_unlock(&root
->fs_info
->trans_lock
);
708 *async_transid
= trans
->transid
;
709 ret
= btrfs_commit_transaction_async(trans
,
710 root
->fs_info
->extent_root
, 1);
712 ret
= btrfs_commit_transaction(trans
, root
);
714 ret
= btrfs_commit_transaction(trans
,
715 root
->fs_info
->extent_root
);
720 ret
= pending_snapshot
->error
;
724 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
728 inode
= btrfs_lookup_dentry(d_inode(dentry
->d_parent
), dentry
);
730 ret
= PTR_ERR(inode
);
734 d_instantiate(dentry
, inode
);
737 btrfs_subvolume_release_metadata(BTRFS_I(dir
)->root
,
738 &pending_snapshot
->block_rsv
,
739 pending_snapshot
->qgroup_reserved
);
741 kfree(pending_snapshot
);
743 if (atomic_dec_and_test(&root
->will_be_snapshoted
))
744 wake_up_atomic_t(&root
->will_be_snapshoted
);
748 /* copy of may_delete in fs/namei.c()
749 * Check whether we can remove a link victim from directory dir, check
750 * whether the type of victim is right.
751 * 1. We can't do it if dir is read-only (done in permission())
752 * 2. We should have write and exec permissions on dir
753 * 3. We can't remove anything from append-only dir
754 * 4. We can't do anything with immutable dir (done in permission())
755 * 5. If the sticky bit on dir is set we should either
756 * a. be owner of dir, or
757 * b. be owner of victim, or
758 * c. have CAP_FOWNER capability
759 * 6. If the victim is append-only or immutable we can't do antyhing with
760 * links pointing to it.
761 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
762 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
763 * 9. We can't remove a root or mountpoint.
764 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
765 * nfs_async_unlink().
768 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
772 if (d_really_is_negative(victim
))
775 BUG_ON(d_inode(victim
->d_parent
) != dir
);
776 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
778 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
783 if (check_sticky(dir
, d_inode(victim
)) || IS_APPEND(d_inode(victim
)) ||
784 IS_IMMUTABLE(d_inode(victim
)) || IS_SWAPFILE(d_inode(victim
)))
787 if (!d_is_dir(victim
))
791 } else if (d_is_dir(victim
))
795 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
800 /* copy of may_create in fs/namei.c() */
801 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
803 if (d_really_is_positive(child
))
807 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
811 * Create a new subvolume below @parent. This is largely modeled after
812 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
813 * inside this filesystem so it's quite a bit simpler.
815 static noinline
int btrfs_mksubvol(struct path
*parent
,
816 char *name
, int namelen
,
817 struct btrfs_root
*snap_src
,
818 u64
*async_transid
, bool readonly
,
819 struct btrfs_qgroup_inherit
*inherit
)
821 struct inode
*dir
= d_inode(parent
->dentry
);
822 struct dentry
*dentry
;
825 error
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
829 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
830 error
= PTR_ERR(dentry
);
835 if (d_really_is_positive(dentry
))
838 error
= btrfs_may_create(dir
, dentry
);
843 * even if this name doesn't exist, we may get hash collisions.
844 * check for them now when we can safely fail
846 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
852 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
854 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
858 error
= create_snapshot(snap_src
, dir
, dentry
, name
, namelen
,
859 async_transid
, readonly
, inherit
);
861 error
= create_subvol(dir
, dentry
, name
, namelen
,
862 async_transid
, inherit
);
865 fsnotify_mkdir(dir
, dentry
);
867 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
871 mutex_unlock(&dir
->i_mutex
);
876 * When we're defragging a range, we don't want to kick it off again
877 * if it is really just waiting for delalloc to send it down.
878 * If we find a nice big extent or delalloc range for the bytes in the
879 * file you want to defrag, we return 0 to let you know to skip this
882 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
884 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
885 struct extent_map
*em
= NULL
;
886 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
889 read_lock(&em_tree
->lock
);
890 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_CACHE_SIZE
);
891 read_unlock(&em_tree
->lock
);
894 end
= extent_map_end(em
);
896 if (end
- offset
> thresh
)
899 /* if we already have a nice delalloc here, just stop */
901 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
902 thresh
, EXTENT_DELALLOC
, 1);
909 * helper function to walk through a file and find extents
910 * newer than a specific transid, and smaller than thresh.
912 * This is used by the defragging code to find new and small
915 static int find_new_extents(struct btrfs_root
*root
,
916 struct inode
*inode
, u64 newer_than
,
917 u64
*off
, u32 thresh
)
919 struct btrfs_path
*path
;
920 struct btrfs_key min_key
;
921 struct extent_buffer
*leaf
;
922 struct btrfs_file_extent_item
*extent
;
925 u64 ino
= btrfs_ino(inode
);
927 path
= btrfs_alloc_path();
931 min_key
.objectid
= ino
;
932 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
933 min_key
.offset
= *off
;
936 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
940 if (min_key
.objectid
!= ino
)
942 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
945 leaf
= path
->nodes
[0];
946 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
947 struct btrfs_file_extent_item
);
949 type
= btrfs_file_extent_type(leaf
, extent
);
950 if (type
== BTRFS_FILE_EXTENT_REG
&&
951 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
952 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
953 *off
= min_key
.offset
;
954 btrfs_free_path(path
);
959 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
960 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
964 if (min_key
.offset
== (u64
)-1)
968 btrfs_release_path(path
);
971 btrfs_free_path(path
);
975 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
977 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
978 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
979 struct extent_map
*em
;
980 u64 len
= PAGE_CACHE_SIZE
;
983 * hopefully we have this extent in the tree already, try without
984 * the full extent lock
986 read_lock(&em_tree
->lock
);
987 em
= lookup_extent_mapping(em_tree
, start
, len
);
988 read_unlock(&em_tree
->lock
);
991 struct extent_state
*cached
= NULL
;
992 u64 end
= start
+ len
- 1;
994 /* get the big lock and read metadata off disk */
995 lock_extent_bits(io_tree
, start
, end
, 0, &cached
);
996 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
997 unlock_extent_cached(io_tree
, start
, end
, &cached
, GFP_NOFS
);
1006 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1008 struct extent_map
*next
;
1011 /* this is the last extent */
1012 if (em
->start
+ em
->len
>= i_size_read(inode
))
1015 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1016 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1018 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1019 (em
->block_len
> 128 * 1024 && next
->block_len
> 128 * 1024))
1022 free_extent_map(next
);
1026 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1027 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1030 struct extent_map
*em
;
1032 bool next_mergeable
= true;
1033 bool prev_mergeable
= true;
1036 * make sure that once we start defragging an extent, we keep on
1039 if (start
< *defrag_end
)
1044 em
= defrag_lookup_extent(inode
, start
);
1048 /* this will cover holes, and inline extents */
1049 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1055 prev_mergeable
= false;
1057 next_mergeable
= defrag_check_next_extent(inode
, em
);
1059 * we hit a real extent, if it is big or the next extent is not a
1060 * real extent, don't bother defragging it
1062 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1063 (em
->len
>= thresh
|| (!next_mergeable
&& !prev_mergeable
)))
1067 * last_len ends up being a counter of how many bytes we've defragged.
1068 * every time we choose not to defrag an extent, we reset *last_len
1069 * so that the next tiny extent will force a defrag.
1071 * The end result of this is that tiny extents before a single big
1072 * extent will force at least part of that big extent to be defragged.
1075 *defrag_end
= extent_map_end(em
);
1078 *skip
= extent_map_end(em
);
1082 free_extent_map(em
);
1087 * it doesn't do much good to defrag one or two pages
1088 * at a time. This pulls in a nice chunk of pages
1089 * to COW and defrag.
1091 * It also makes sure the delalloc code has enough
1092 * dirty data to avoid making new small extents as part
1095 * It's a good idea to start RA on this range
1096 * before calling this.
1098 static int cluster_pages_for_defrag(struct inode
*inode
,
1099 struct page
**pages
,
1100 unsigned long start_index
,
1101 unsigned long num_pages
)
1103 unsigned long file_end
;
1104 u64 isize
= i_size_read(inode
);
1111 struct btrfs_ordered_extent
*ordered
;
1112 struct extent_state
*cached_state
= NULL
;
1113 struct extent_io_tree
*tree
;
1114 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1116 file_end
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1117 if (!isize
|| start_index
> file_end
)
1120 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1122 ret
= btrfs_delalloc_reserve_space(inode
,
1123 start_index
<< PAGE_CACHE_SHIFT
,
1124 page_cnt
<< PAGE_CACHE_SHIFT
);
1128 tree
= &BTRFS_I(inode
)->io_tree
;
1130 /* step one, lock all the pages */
1131 for (i
= 0; i
< page_cnt
; i
++) {
1134 page
= find_or_create_page(inode
->i_mapping
,
1135 start_index
+ i
, mask
);
1139 page_start
= page_offset(page
);
1140 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1142 lock_extent_bits(tree
, page_start
, page_end
,
1144 ordered
= btrfs_lookup_ordered_extent(inode
,
1146 unlock_extent_cached(tree
, page_start
, page_end
,
1147 &cached_state
, GFP_NOFS
);
1152 btrfs_start_ordered_extent(inode
, ordered
, 1);
1153 btrfs_put_ordered_extent(ordered
);
1156 * we unlocked the page above, so we need check if
1157 * it was released or not.
1159 if (page
->mapping
!= inode
->i_mapping
) {
1161 page_cache_release(page
);
1166 if (!PageUptodate(page
)) {
1167 btrfs_readpage(NULL
, page
);
1169 if (!PageUptodate(page
)) {
1171 page_cache_release(page
);
1177 if (page
->mapping
!= inode
->i_mapping
) {
1179 page_cache_release(page
);
1189 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1193 * so now we have a nice long stream of locked
1194 * and up to date pages, lets wait on them
1196 for (i
= 0; i
< i_done
; i
++)
1197 wait_on_page_writeback(pages
[i
]);
1199 page_start
= page_offset(pages
[0]);
1200 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_CACHE_SIZE
;
1202 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1203 page_start
, page_end
- 1, 0, &cached_state
);
1204 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1205 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1206 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1207 &cached_state
, GFP_NOFS
);
1209 if (i_done
!= page_cnt
) {
1210 spin_lock(&BTRFS_I(inode
)->lock
);
1211 BTRFS_I(inode
)->outstanding_extents
++;
1212 spin_unlock(&BTRFS_I(inode
)->lock
);
1213 btrfs_delalloc_release_space(inode
,
1214 start_index
<< PAGE_CACHE_SHIFT
,
1215 (page_cnt
- i_done
) << PAGE_CACHE_SHIFT
);
1219 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1220 &cached_state
, GFP_NOFS
);
1222 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1223 page_start
, page_end
- 1, &cached_state
,
1226 for (i
= 0; i
< i_done
; i
++) {
1227 clear_page_dirty_for_io(pages
[i
]);
1228 ClearPageChecked(pages
[i
]);
1229 set_page_extent_mapped(pages
[i
]);
1230 set_page_dirty(pages
[i
]);
1231 unlock_page(pages
[i
]);
1232 page_cache_release(pages
[i
]);
1236 for (i
= 0; i
< i_done
; i
++) {
1237 unlock_page(pages
[i
]);
1238 page_cache_release(pages
[i
]);
1240 btrfs_delalloc_release_space(inode
,
1241 start_index
<< PAGE_CACHE_SHIFT
,
1242 page_cnt
<< PAGE_CACHE_SHIFT
);
1247 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1248 struct btrfs_ioctl_defrag_range_args
*range
,
1249 u64 newer_than
, unsigned long max_to_defrag
)
1251 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1252 struct file_ra_state
*ra
= NULL
;
1253 unsigned long last_index
;
1254 u64 isize
= i_size_read(inode
);
1258 u64 newer_off
= range
->start
;
1260 unsigned long ra_index
= 0;
1262 int defrag_count
= 0;
1263 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1264 u32 extent_thresh
= range
->extent_thresh
;
1265 unsigned long max_cluster
= (256 * 1024) >> PAGE_CACHE_SHIFT
;
1266 unsigned long cluster
= max_cluster
;
1267 u64 new_align
= ~((u64
)128 * 1024 - 1);
1268 struct page
**pages
= NULL
;
1273 if (range
->start
>= isize
)
1276 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1277 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1279 if (range
->compress_type
)
1280 compress_type
= range
->compress_type
;
1283 if (extent_thresh
== 0)
1284 extent_thresh
= 256 * 1024;
1287 * if we were not given a file, allocate a readahead
1291 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
1294 file_ra_state_init(ra
, inode
->i_mapping
);
1299 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*),
1306 /* find the last page to defrag */
1307 if (range
->start
+ range
->len
> range
->start
) {
1308 last_index
= min_t(u64
, isize
- 1,
1309 range
->start
+ range
->len
- 1) >> PAGE_CACHE_SHIFT
;
1311 last_index
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1315 ret
= find_new_extents(root
, inode
, newer_than
,
1316 &newer_off
, 64 * 1024);
1318 range
->start
= newer_off
;
1320 * we always align our defrag to help keep
1321 * the extents in the file evenly spaced
1323 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1327 i
= range
->start
>> PAGE_CACHE_SHIFT
;
1330 max_to_defrag
= last_index
- i
+ 1;
1333 * make writeback starts from i, so the defrag range can be
1334 * written sequentially.
1336 if (i
< inode
->i_mapping
->writeback_index
)
1337 inode
->i_mapping
->writeback_index
= i
;
1339 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1340 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_CACHE_SIZE
))) {
1342 * make sure we stop running if someone unmounts
1345 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1348 if (btrfs_defrag_cancelled(root
->fs_info
)) {
1349 btrfs_debug(root
->fs_info
, "defrag_file cancelled");
1354 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_CACHE_SHIFT
,
1355 extent_thresh
, &last_len
, &skip
,
1356 &defrag_end
, range
->flags
&
1357 BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1360 * the should_defrag function tells us how much to skip
1361 * bump our counter by the suggested amount
1363 next
= DIV_ROUND_UP(skip
, PAGE_CACHE_SIZE
);
1364 i
= max(i
+ 1, next
);
1369 cluster
= (PAGE_CACHE_ALIGN(defrag_end
) >>
1370 PAGE_CACHE_SHIFT
) - i
;
1371 cluster
= min(cluster
, max_cluster
);
1373 cluster
= max_cluster
;
1376 if (i
+ cluster
> ra_index
) {
1377 ra_index
= max(i
, ra_index
);
1378 btrfs_force_ra(inode
->i_mapping
, ra
, file
, ra_index
,
1380 ra_index
+= cluster
;
1383 mutex_lock(&inode
->i_mutex
);
1384 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
1385 BTRFS_I(inode
)->force_compress
= compress_type
;
1386 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1388 mutex_unlock(&inode
->i_mutex
);
1392 defrag_count
+= ret
;
1393 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1394 mutex_unlock(&inode
->i_mutex
);
1397 if (newer_off
== (u64
)-1)
1403 newer_off
= max(newer_off
+ 1,
1404 (u64
)i
<< PAGE_CACHE_SHIFT
);
1406 ret
= find_new_extents(root
, inode
,
1407 newer_than
, &newer_off
,
1410 range
->start
= newer_off
;
1411 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1418 last_len
+= ret
<< PAGE_CACHE_SHIFT
;
1426 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1427 filemap_flush(inode
->i_mapping
);
1428 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1429 &BTRFS_I(inode
)->runtime_flags
))
1430 filemap_flush(inode
->i_mapping
);
1433 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1434 /* the filemap_flush will queue IO into the worker threads, but
1435 * we have to make sure the IO is actually started and that
1436 * ordered extents get created before we return
1438 atomic_inc(&root
->fs_info
->async_submit_draining
);
1439 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
1440 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1441 wait_event(root
->fs_info
->async_submit_wait
,
1442 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
1443 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
1445 atomic_dec(&root
->fs_info
->async_submit_draining
);
1448 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1449 btrfs_set_fs_incompat(root
->fs_info
, COMPRESS_LZO
);
1455 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1456 mutex_lock(&inode
->i_mutex
);
1457 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
1458 mutex_unlock(&inode
->i_mutex
);
1466 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1472 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
1473 struct btrfs_ioctl_vol_args
*vol_args
;
1474 struct btrfs_trans_handle
*trans
;
1475 struct btrfs_device
*device
= NULL
;
1478 char *devstr
= NULL
;
1482 if (!capable(CAP_SYS_ADMIN
))
1485 ret
= mnt_want_write_file(file
);
1489 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
1491 mnt_drop_write_file(file
);
1492 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1495 mutex_lock(&root
->fs_info
->volume_mutex
);
1496 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1497 if (IS_ERR(vol_args
)) {
1498 ret
= PTR_ERR(vol_args
);
1502 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1504 sizestr
= vol_args
->name
;
1505 devstr
= strchr(sizestr
, ':');
1507 sizestr
= devstr
+ 1;
1509 devstr
= vol_args
->name
;
1510 ret
= kstrtoull(devstr
, 10, &devid
);
1517 btrfs_info(root
->fs_info
, "resizing devid %llu", devid
);
1520 device
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
1522 btrfs_info(root
->fs_info
, "resizer unable to find device %llu",
1528 if (!device
->writeable
) {
1529 btrfs_info(root
->fs_info
,
1530 "resizer unable to apply on readonly device %llu",
1536 if (!strcmp(sizestr
, "max"))
1537 new_size
= device
->bdev
->bd_inode
->i_size
;
1539 if (sizestr
[0] == '-') {
1542 } else if (sizestr
[0] == '+') {
1546 new_size
= memparse(sizestr
, &retptr
);
1547 if (*retptr
!= '\0' || new_size
== 0) {
1553 if (device
->is_tgtdev_for_dev_replace
) {
1558 old_size
= btrfs_device_get_total_bytes(device
);
1561 if (new_size
> old_size
) {
1565 new_size
= old_size
- new_size
;
1566 } else if (mod
> 0) {
1567 if (new_size
> ULLONG_MAX
- old_size
) {
1571 new_size
= old_size
+ new_size
;
1574 if (new_size
< 256 * 1024 * 1024) {
1578 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1583 new_size
= div_u64(new_size
, root
->sectorsize
);
1584 new_size
*= root
->sectorsize
;
1586 btrfs_info_in_rcu(root
->fs_info
, "new size for %s is %llu",
1587 rcu_str_deref(device
->name
), new_size
);
1589 if (new_size
> old_size
) {
1590 trans
= btrfs_start_transaction(root
, 0);
1591 if (IS_ERR(trans
)) {
1592 ret
= PTR_ERR(trans
);
1595 ret
= btrfs_grow_device(trans
, device
, new_size
);
1596 btrfs_commit_transaction(trans
, root
);
1597 } else if (new_size
< old_size
) {
1598 ret
= btrfs_shrink_device(device
, new_size
);
1599 } /* equal, nothing need to do */
1604 mutex_unlock(&root
->fs_info
->volume_mutex
);
1605 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
1606 mnt_drop_write_file(file
);
1610 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1611 char *name
, unsigned long fd
, int subvol
,
1612 u64
*transid
, bool readonly
,
1613 struct btrfs_qgroup_inherit
*inherit
)
1618 ret
= mnt_want_write_file(file
);
1622 namelen
= strlen(name
);
1623 if (strchr(name
, '/')) {
1625 goto out_drop_write
;
1628 if (name
[0] == '.' &&
1629 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1631 goto out_drop_write
;
1635 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1636 NULL
, transid
, readonly
, inherit
);
1638 struct fd src
= fdget(fd
);
1639 struct inode
*src_inode
;
1642 goto out_drop_write
;
1645 src_inode
= file_inode(src
.file
);
1646 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1647 btrfs_info(BTRFS_I(src_inode
)->root
->fs_info
,
1648 "Snapshot src from another FS");
1650 } else if (!inode_owner_or_capable(src_inode
)) {
1652 * Subvolume creation is not restricted, but snapshots
1653 * are limited to own subvolumes only
1657 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1658 BTRFS_I(src_inode
)->root
,
1659 transid
, readonly
, inherit
);
1664 mnt_drop_write_file(file
);
1669 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1670 void __user
*arg
, int subvol
)
1672 struct btrfs_ioctl_vol_args
*vol_args
;
1675 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1676 if (IS_ERR(vol_args
))
1677 return PTR_ERR(vol_args
);
1678 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1680 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1681 vol_args
->fd
, subvol
,
1688 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1689 void __user
*arg
, int subvol
)
1691 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1695 bool readonly
= false;
1696 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1698 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1699 if (IS_ERR(vol_args
))
1700 return PTR_ERR(vol_args
);
1701 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1703 if (vol_args
->flags
&
1704 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1705 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1710 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1712 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1714 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1715 if (vol_args
->size
> PAGE_CACHE_SIZE
) {
1719 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1720 if (IS_ERR(inherit
)) {
1721 ret
= PTR_ERR(inherit
);
1726 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1727 vol_args
->fd
, subvol
, ptr
,
1732 if (ptr
&& copy_to_user(arg
+
1733 offsetof(struct btrfs_ioctl_vol_args_v2
,
1745 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1748 struct inode
*inode
= file_inode(file
);
1749 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1753 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
)
1756 down_read(&root
->fs_info
->subvol_sem
);
1757 if (btrfs_root_readonly(root
))
1758 flags
|= BTRFS_SUBVOL_RDONLY
;
1759 up_read(&root
->fs_info
->subvol_sem
);
1761 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1767 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1770 struct inode
*inode
= file_inode(file
);
1771 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1772 struct btrfs_trans_handle
*trans
;
1777 if (!inode_owner_or_capable(inode
))
1780 ret
= mnt_want_write_file(file
);
1784 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
1786 goto out_drop_write
;
1789 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1791 goto out_drop_write
;
1794 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1796 goto out_drop_write
;
1799 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1801 goto out_drop_write
;
1804 down_write(&root
->fs_info
->subvol_sem
);
1807 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1810 root_flags
= btrfs_root_flags(&root
->root_item
);
1811 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1812 btrfs_set_root_flags(&root
->root_item
,
1813 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1816 * Block RO -> RW transition if this subvolume is involved in
1819 spin_lock(&root
->root_item_lock
);
1820 if (root
->send_in_progress
== 0) {
1821 btrfs_set_root_flags(&root
->root_item
,
1822 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1823 spin_unlock(&root
->root_item_lock
);
1825 spin_unlock(&root
->root_item_lock
);
1826 btrfs_warn(root
->fs_info
,
1827 "Attempt to set subvolume %llu read-write during send",
1828 root
->root_key
.objectid
);
1834 trans
= btrfs_start_transaction(root
, 1);
1835 if (IS_ERR(trans
)) {
1836 ret
= PTR_ERR(trans
);
1840 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
1841 &root
->root_key
, &root
->root_item
);
1843 btrfs_commit_transaction(trans
, root
);
1846 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1848 up_write(&root
->fs_info
->subvol_sem
);
1850 mnt_drop_write_file(file
);
1856 * helper to check if the subvolume references other subvolumes
1858 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1860 struct btrfs_path
*path
;
1861 struct btrfs_dir_item
*di
;
1862 struct btrfs_key key
;
1866 path
= btrfs_alloc_path();
1870 /* Make sure this root isn't set as the default subvol */
1871 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
1872 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
, path
,
1873 dir_id
, "default", 7, 0);
1874 if (di
&& !IS_ERR(di
)) {
1875 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
1876 if (key
.objectid
== root
->root_key
.objectid
) {
1878 btrfs_err(root
->fs_info
, "deleting default subvolume "
1879 "%llu is not allowed", key
.objectid
);
1882 btrfs_release_path(path
);
1885 key
.objectid
= root
->root_key
.objectid
;
1886 key
.type
= BTRFS_ROOT_REF_KEY
;
1887 key
.offset
= (u64
)-1;
1889 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
1896 if (path
->slots
[0] > 0) {
1898 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1899 if (key
.objectid
== root
->root_key
.objectid
&&
1900 key
.type
== BTRFS_ROOT_REF_KEY
)
1904 btrfs_free_path(path
);
1908 static noinline
int key_in_sk(struct btrfs_key
*key
,
1909 struct btrfs_ioctl_search_key
*sk
)
1911 struct btrfs_key test
;
1914 test
.objectid
= sk
->min_objectid
;
1915 test
.type
= sk
->min_type
;
1916 test
.offset
= sk
->min_offset
;
1918 ret
= btrfs_comp_cpu_keys(key
, &test
);
1922 test
.objectid
= sk
->max_objectid
;
1923 test
.type
= sk
->max_type
;
1924 test
.offset
= sk
->max_offset
;
1926 ret
= btrfs_comp_cpu_keys(key
, &test
);
1932 static noinline
int copy_to_sk(struct btrfs_root
*root
,
1933 struct btrfs_path
*path
,
1934 struct btrfs_key
*key
,
1935 struct btrfs_ioctl_search_key
*sk
,
1938 unsigned long *sk_offset
,
1942 struct extent_buffer
*leaf
;
1943 struct btrfs_ioctl_search_header sh
;
1944 struct btrfs_key test
;
1945 unsigned long item_off
;
1946 unsigned long item_len
;
1952 leaf
= path
->nodes
[0];
1953 slot
= path
->slots
[0];
1954 nritems
= btrfs_header_nritems(leaf
);
1956 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1960 found_transid
= btrfs_header_generation(leaf
);
1962 for (i
= slot
; i
< nritems
; i
++) {
1963 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1964 item_len
= btrfs_item_size_nr(leaf
, i
);
1966 btrfs_item_key_to_cpu(leaf
, key
, i
);
1967 if (!key_in_sk(key
, sk
))
1970 if (sizeof(sh
) + item_len
> *buf_size
) {
1977 * return one empty item back for v1, which does not
1981 *buf_size
= sizeof(sh
) + item_len
;
1986 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
1991 sh
.objectid
= key
->objectid
;
1992 sh
.offset
= key
->offset
;
1993 sh
.type
= key
->type
;
1995 sh
.transid
= found_transid
;
1997 /* copy search result header */
1998 if (copy_to_user(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
2003 *sk_offset
+= sizeof(sh
);
2006 char __user
*up
= ubuf
+ *sk_offset
;
2008 if (read_extent_buffer_to_user(leaf
, up
,
2009 item_off
, item_len
)) {
2014 *sk_offset
+= item_len
;
2018 if (ret
) /* -EOVERFLOW from above */
2021 if (*num_found
>= sk
->nr_items
) {
2028 test
.objectid
= sk
->max_objectid
;
2029 test
.type
= sk
->max_type
;
2030 test
.offset
= sk
->max_offset
;
2031 if (btrfs_comp_cpu_keys(key
, &test
) >= 0)
2033 else if (key
->offset
< (u64
)-1)
2035 else if (key
->type
< (u8
)-1) {
2038 } else if (key
->objectid
< (u64
)-1) {
2046 * 0: all items from this leaf copied, continue with next
2047 * 1: * more items can be copied, but unused buffer is too small
2048 * * all items were found
2049 * Either way, it will stops the loop which iterates to the next
2051 * -EOVERFLOW: item was to large for buffer
2052 * -EFAULT: could not copy extent buffer back to userspace
2057 static noinline
int search_ioctl(struct inode
*inode
,
2058 struct btrfs_ioctl_search_key
*sk
,
2062 struct btrfs_root
*root
;
2063 struct btrfs_key key
;
2064 struct btrfs_path
*path
;
2065 struct btrfs_fs_info
*info
= BTRFS_I(inode
)->root
->fs_info
;
2068 unsigned long sk_offset
= 0;
2070 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2071 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2075 path
= btrfs_alloc_path();
2079 if (sk
->tree_id
== 0) {
2080 /* search the root of the inode that was passed */
2081 root
= BTRFS_I(inode
)->root
;
2083 key
.objectid
= sk
->tree_id
;
2084 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2085 key
.offset
= (u64
)-1;
2086 root
= btrfs_read_fs_root_no_name(info
, &key
);
2088 btrfs_err(info
, "could not find root %llu",
2090 btrfs_free_path(path
);
2095 key
.objectid
= sk
->min_objectid
;
2096 key
.type
= sk
->min_type
;
2097 key
.offset
= sk
->min_offset
;
2100 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2106 ret
= copy_to_sk(root
, path
, &key
, sk
, buf_size
, ubuf
,
2107 &sk_offset
, &num_found
);
2108 btrfs_release_path(path
);
2116 sk
->nr_items
= num_found
;
2117 btrfs_free_path(path
);
2121 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2124 struct btrfs_ioctl_search_args __user
*uargs
;
2125 struct btrfs_ioctl_search_key sk
;
2126 struct inode
*inode
;
2130 if (!capable(CAP_SYS_ADMIN
))
2133 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2135 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2138 buf_size
= sizeof(uargs
->buf
);
2140 inode
= file_inode(file
);
2141 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2144 * In the origin implementation an overflow is handled by returning a
2145 * search header with a len of zero, so reset ret.
2147 if (ret
== -EOVERFLOW
)
2150 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2155 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2158 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2159 struct btrfs_ioctl_search_args_v2 args
;
2160 struct inode
*inode
;
2163 const size_t buf_limit
= 16 * 1024 * 1024;
2165 if (!capable(CAP_SYS_ADMIN
))
2168 /* copy search header and buffer size */
2169 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2170 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2173 buf_size
= args
.buf_size
;
2175 if (buf_size
< sizeof(struct btrfs_ioctl_search_header
))
2178 /* limit result size to 16MB */
2179 if (buf_size
> buf_limit
)
2180 buf_size
= buf_limit
;
2182 inode
= file_inode(file
);
2183 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2184 (char *)(&uarg
->buf
[0]));
2185 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2187 else if (ret
== -EOVERFLOW
&&
2188 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2195 * Search INODE_REFs to identify path name of 'dirid' directory
2196 * in a 'tree_id' tree. and sets path name to 'name'.
2198 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2199 u64 tree_id
, u64 dirid
, char *name
)
2201 struct btrfs_root
*root
;
2202 struct btrfs_key key
;
2208 struct btrfs_inode_ref
*iref
;
2209 struct extent_buffer
*l
;
2210 struct btrfs_path
*path
;
2212 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2217 path
= btrfs_alloc_path();
2221 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
2223 key
.objectid
= tree_id
;
2224 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2225 key
.offset
= (u64
)-1;
2226 root
= btrfs_read_fs_root_no_name(info
, &key
);
2228 btrfs_err(info
, "could not find root %llu", tree_id
);
2233 key
.objectid
= dirid
;
2234 key
.type
= BTRFS_INODE_REF_KEY
;
2235 key
.offset
= (u64
)-1;
2238 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2242 ret
= btrfs_previous_item(root
, path
, dirid
,
2243 BTRFS_INODE_REF_KEY
);
2253 slot
= path
->slots
[0];
2254 btrfs_item_key_to_cpu(l
, &key
, slot
);
2256 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2257 len
= btrfs_inode_ref_name_len(l
, iref
);
2259 total_len
+= len
+ 1;
2261 ret
= -ENAMETOOLONG
;
2266 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2268 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2271 btrfs_release_path(path
);
2272 key
.objectid
= key
.offset
;
2273 key
.offset
= (u64
)-1;
2274 dirid
= key
.objectid
;
2276 memmove(name
, ptr
, total_len
);
2277 name
[total_len
] = '\0';
2280 btrfs_free_path(path
);
2284 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2287 struct btrfs_ioctl_ino_lookup_args
*args
;
2288 struct inode
*inode
;
2291 args
= memdup_user(argp
, sizeof(*args
));
2293 return PTR_ERR(args
);
2295 inode
= file_inode(file
);
2298 * Unprivileged query to obtain the containing subvolume root id. The
2299 * path is reset so it's consistent with btrfs_search_path_in_tree.
2301 if (args
->treeid
== 0)
2302 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2304 if (args
->objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2309 if (!capable(CAP_SYS_ADMIN
)) {
2314 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2315 args
->treeid
, args
->objectid
,
2319 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2326 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2329 struct dentry
*parent
= file
->f_path
.dentry
;
2330 struct dentry
*dentry
;
2331 struct inode
*dir
= d_inode(parent
);
2332 struct inode
*inode
;
2333 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2334 struct btrfs_root
*dest
= NULL
;
2335 struct btrfs_ioctl_vol_args
*vol_args
;
2336 struct btrfs_trans_handle
*trans
;
2337 struct btrfs_block_rsv block_rsv
;
2339 u64 qgroup_reserved
;
2344 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2345 if (IS_ERR(vol_args
))
2346 return PTR_ERR(vol_args
);
2348 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2349 namelen
= strlen(vol_args
->name
);
2350 if (strchr(vol_args
->name
, '/') ||
2351 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2356 err
= mnt_want_write_file(file
);
2361 err
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
2363 goto out_drop_write
;
2364 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2365 if (IS_ERR(dentry
)) {
2366 err
= PTR_ERR(dentry
);
2367 goto out_unlock_dir
;
2370 if (d_really_is_negative(dentry
)) {
2375 inode
= d_inode(dentry
);
2376 dest
= BTRFS_I(inode
)->root
;
2377 if (!capable(CAP_SYS_ADMIN
)) {
2379 * Regular user. Only allow this with a special mount
2380 * option, when the user has write+exec access to the
2381 * subvol root, and when rmdir(2) would have been
2384 * Note that this is _not_ check that the subvol is
2385 * empty or doesn't contain data that we wouldn't
2386 * otherwise be able to delete.
2388 * Users who want to delete empty subvols should try
2392 if (!btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
2396 * Do not allow deletion if the parent dir is the same
2397 * as the dir to be deleted. That means the ioctl
2398 * must be called on the dentry referencing the root
2399 * of the subvol, not a random directory contained
2406 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2411 /* check if subvolume may be deleted by a user */
2412 err
= btrfs_may_delete(dir
, dentry
, 1);
2416 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
2421 mutex_lock(&inode
->i_mutex
);
2424 * Don't allow to delete a subvolume with send in progress. This is
2425 * inside the i_mutex so the error handling that has to drop the bit
2426 * again is not run concurrently.
2428 spin_lock(&dest
->root_item_lock
);
2429 root_flags
= btrfs_root_flags(&dest
->root_item
);
2430 if (dest
->send_in_progress
== 0) {
2431 btrfs_set_root_flags(&dest
->root_item
,
2432 root_flags
| BTRFS_ROOT_SUBVOL_DEAD
);
2433 spin_unlock(&dest
->root_item_lock
);
2435 spin_unlock(&dest
->root_item_lock
);
2436 btrfs_warn(root
->fs_info
,
2437 "Attempt to delete subvolume %llu during send",
2438 dest
->root_key
.objectid
);
2440 goto out_unlock_inode
;
2443 down_write(&root
->fs_info
->subvol_sem
);
2445 err
= may_destroy_subvol(dest
);
2449 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
2451 * One for dir inode, two for dir entries, two for root
2454 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
2455 5, &qgroup_reserved
, true);
2459 trans
= btrfs_start_transaction(root
, 0);
2460 if (IS_ERR(trans
)) {
2461 err
= PTR_ERR(trans
);
2464 trans
->block_rsv
= &block_rsv
;
2465 trans
->bytes_reserved
= block_rsv
.size
;
2467 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
2468 dest
->root_key
.objectid
,
2469 dentry
->d_name
.name
,
2470 dentry
->d_name
.len
);
2473 btrfs_abort_transaction(trans
, root
, ret
);
2477 btrfs_record_root_in_trans(trans
, dest
);
2479 memset(&dest
->root_item
.drop_progress
, 0,
2480 sizeof(dest
->root_item
.drop_progress
));
2481 dest
->root_item
.drop_level
= 0;
2482 btrfs_set_root_refs(&dest
->root_item
, 0);
2484 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &dest
->state
)) {
2485 ret
= btrfs_insert_orphan_item(trans
,
2486 root
->fs_info
->tree_root
,
2487 dest
->root_key
.objectid
);
2489 btrfs_abort_transaction(trans
, root
, ret
);
2495 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2496 dest
->root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
2497 dest
->root_key
.objectid
);
2498 if (ret
&& ret
!= -ENOENT
) {
2499 btrfs_abort_transaction(trans
, root
, ret
);
2503 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
2504 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2505 dest
->root_item
.received_uuid
,
2506 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
2507 dest
->root_key
.objectid
);
2508 if (ret
&& ret
!= -ENOENT
) {
2509 btrfs_abort_transaction(trans
, root
, ret
);
2516 trans
->block_rsv
= NULL
;
2517 trans
->bytes_reserved
= 0;
2518 ret
= btrfs_end_transaction(trans
, root
);
2521 inode
->i_flags
|= S_DEAD
;
2523 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
2525 up_write(&root
->fs_info
->subvol_sem
);
2527 spin_lock(&dest
->root_item_lock
);
2528 root_flags
= btrfs_root_flags(&dest
->root_item
);
2529 btrfs_set_root_flags(&dest
->root_item
,
2530 root_flags
& ~BTRFS_ROOT_SUBVOL_DEAD
);
2531 spin_unlock(&dest
->root_item_lock
);
2534 mutex_unlock(&inode
->i_mutex
);
2536 d_invalidate(dentry
);
2537 btrfs_invalidate_inodes(dest
);
2539 ASSERT(dest
->send_in_progress
== 0);
2542 if (dest
->ino_cache_inode
) {
2543 iput(dest
->ino_cache_inode
);
2544 dest
->ino_cache_inode
= NULL
;
2550 mutex_unlock(&dir
->i_mutex
);
2552 mnt_drop_write_file(file
);
2558 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2560 struct inode
*inode
= file_inode(file
);
2561 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2562 struct btrfs_ioctl_defrag_range_args
*range
;
2565 ret
= mnt_want_write_file(file
);
2569 if (btrfs_root_readonly(root
)) {
2574 switch (inode
->i_mode
& S_IFMT
) {
2576 if (!capable(CAP_SYS_ADMIN
)) {
2580 ret
= btrfs_defrag_root(root
);
2583 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
);
2586 if (!(file
->f_mode
& FMODE_WRITE
)) {
2591 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2598 if (copy_from_user(range
, argp
,
2604 /* compression requires us to start the IO */
2605 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2606 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2607 range
->extent_thresh
= (u32
)-1;
2610 /* the rest are all set to zero by kzalloc */
2611 range
->len
= (u64
)-1;
2613 ret
= btrfs_defrag_file(file_inode(file
), file
,
2623 mnt_drop_write_file(file
);
2627 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
2629 struct btrfs_ioctl_vol_args
*vol_args
;
2632 if (!capable(CAP_SYS_ADMIN
))
2635 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2637 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2640 mutex_lock(&root
->fs_info
->volume_mutex
);
2641 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2642 if (IS_ERR(vol_args
)) {
2643 ret
= PTR_ERR(vol_args
);
2647 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2648 ret
= btrfs_init_new_device(root
, vol_args
->name
);
2651 btrfs_info(root
->fs_info
, "disk added %s",vol_args
->name
);
2655 mutex_unlock(&root
->fs_info
->volume_mutex
);
2656 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2660 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
2662 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
2663 struct btrfs_ioctl_vol_args
*vol_args
;
2666 if (!capable(CAP_SYS_ADMIN
))
2669 ret
= mnt_want_write_file(file
);
2673 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2674 if (IS_ERR(vol_args
)) {
2675 ret
= PTR_ERR(vol_args
);
2679 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2681 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2683 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2687 mutex_lock(&root
->fs_info
->volume_mutex
);
2688 ret
= btrfs_rm_device(root
, vol_args
->name
);
2689 mutex_unlock(&root
->fs_info
->volume_mutex
);
2690 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2693 btrfs_info(root
->fs_info
, "disk deleted %s",vol_args
->name
);
2698 mnt_drop_write_file(file
);
2702 static long btrfs_ioctl_fs_info(struct btrfs_root
*root
, void __user
*arg
)
2704 struct btrfs_ioctl_fs_info_args
*fi_args
;
2705 struct btrfs_device
*device
;
2706 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2709 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
2713 mutex_lock(&fs_devices
->device_list_mutex
);
2714 fi_args
->num_devices
= fs_devices
->num_devices
;
2715 memcpy(&fi_args
->fsid
, root
->fs_info
->fsid
, sizeof(fi_args
->fsid
));
2717 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
2718 if (device
->devid
> fi_args
->max_id
)
2719 fi_args
->max_id
= device
->devid
;
2721 mutex_unlock(&fs_devices
->device_list_mutex
);
2723 fi_args
->nodesize
= root
->fs_info
->super_copy
->nodesize
;
2724 fi_args
->sectorsize
= root
->fs_info
->super_copy
->sectorsize
;
2725 fi_args
->clone_alignment
= root
->fs_info
->super_copy
->sectorsize
;
2727 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
2734 static long btrfs_ioctl_dev_info(struct btrfs_root
*root
, void __user
*arg
)
2736 struct btrfs_ioctl_dev_info_args
*di_args
;
2737 struct btrfs_device
*dev
;
2738 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2740 char *s_uuid
= NULL
;
2742 di_args
= memdup_user(arg
, sizeof(*di_args
));
2743 if (IS_ERR(di_args
))
2744 return PTR_ERR(di_args
);
2746 if (!btrfs_is_empty_uuid(di_args
->uuid
))
2747 s_uuid
= di_args
->uuid
;
2749 mutex_lock(&fs_devices
->device_list_mutex
);
2750 dev
= btrfs_find_device(root
->fs_info
, di_args
->devid
, s_uuid
, NULL
);
2757 di_args
->devid
= dev
->devid
;
2758 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
2759 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
2760 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
2762 struct rcu_string
*name
;
2765 name
= rcu_dereference(dev
->name
);
2766 strncpy(di_args
->path
, name
->str
, sizeof(di_args
->path
));
2768 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
2770 di_args
->path
[0] = '\0';
2774 mutex_unlock(&fs_devices
->device_list_mutex
);
2775 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
2782 static struct page
*extent_same_get_page(struct inode
*inode
, pgoff_t index
)
2785 struct extent_io_tree
*tree
= &BTRFS_I(inode
)->io_tree
;
2787 page
= grab_cache_page(inode
->i_mapping
, index
);
2791 if (!PageUptodate(page
)) {
2792 if (extent_read_full_page_nolock(tree
, page
, btrfs_get_extent
,
2796 if (!PageUptodate(page
)) {
2798 page_cache_release(page
);
2807 static int gather_extent_pages(struct inode
*inode
, struct page
**pages
,
2808 int num_pages
, u64 off
)
2811 pgoff_t index
= off
>> PAGE_CACHE_SHIFT
;
2813 for (i
= 0; i
< num_pages
; i
++) {
2814 pages
[i
] = extent_same_get_page(inode
, index
+ i
);
2821 static inline void lock_extent_range(struct inode
*inode
, u64 off
, u64 len
)
2823 /* do any pending delalloc/csum calc on src, one way or
2824 another, and lock file content */
2826 struct btrfs_ordered_extent
*ordered
;
2827 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2828 ordered
= btrfs_lookup_first_ordered_extent(inode
,
2831 ordered
->file_offset
+ ordered
->len
<= off
||
2832 ordered
->file_offset
>= off
+ len
) &&
2833 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
2834 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
)) {
2836 btrfs_put_ordered_extent(ordered
);
2839 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2841 btrfs_put_ordered_extent(ordered
);
2842 btrfs_wait_ordered_range(inode
, off
, len
);
2846 static void btrfs_double_inode_unlock(struct inode
*inode1
, struct inode
*inode2
)
2848 mutex_unlock(&inode1
->i_mutex
);
2849 mutex_unlock(&inode2
->i_mutex
);
2852 static void btrfs_double_inode_lock(struct inode
*inode1
, struct inode
*inode2
)
2854 if (inode1
< inode2
)
2855 swap(inode1
, inode2
);
2857 mutex_lock_nested(&inode1
->i_mutex
, I_MUTEX_PARENT
);
2858 mutex_lock_nested(&inode2
->i_mutex
, I_MUTEX_CHILD
);
2861 static void btrfs_double_extent_unlock(struct inode
*inode1
, u64 loff1
,
2862 struct inode
*inode2
, u64 loff2
, u64 len
)
2864 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
2865 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
2868 static void btrfs_double_extent_lock(struct inode
*inode1
, u64 loff1
,
2869 struct inode
*inode2
, u64 loff2
, u64 len
)
2871 if (inode1
< inode2
) {
2872 swap(inode1
, inode2
);
2875 lock_extent_range(inode1
, loff1
, len
);
2876 lock_extent_range(inode2
, loff2
, len
);
2881 struct page
**src_pages
;
2882 struct page
**dst_pages
;
2885 static void btrfs_cmp_data_free(struct cmp_pages
*cmp
)
2890 for (i
= 0; i
< cmp
->num_pages
; i
++) {
2891 pg
= cmp
->src_pages
[i
];
2893 page_cache_release(pg
);
2894 pg
= cmp
->dst_pages
[i
];
2896 page_cache_release(pg
);
2898 kfree(cmp
->src_pages
);
2899 kfree(cmp
->dst_pages
);
2902 static int btrfs_cmp_data_prepare(struct inode
*src
, u64 loff
,
2903 struct inode
*dst
, u64 dst_loff
,
2904 u64 len
, struct cmp_pages
*cmp
)
2907 int num_pages
= PAGE_CACHE_ALIGN(len
) >> PAGE_CACHE_SHIFT
;
2908 struct page
**src_pgarr
, **dst_pgarr
;
2911 * We must gather up all the pages before we initiate our
2912 * extent locking. We use an array for the page pointers. Size
2913 * of the array is bounded by len, which is in turn bounded by
2914 * BTRFS_MAX_DEDUPE_LEN.
2916 src_pgarr
= kzalloc(num_pages
* sizeof(struct page
*), GFP_NOFS
);
2917 dst_pgarr
= kzalloc(num_pages
* sizeof(struct page
*), GFP_NOFS
);
2918 if (!src_pgarr
|| !dst_pgarr
) {
2923 cmp
->num_pages
= num_pages
;
2924 cmp
->src_pages
= src_pgarr
;
2925 cmp
->dst_pages
= dst_pgarr
;
2927 ret
= gather_extent_pages(src
, cmp
->src_pages
, cmp
->num_pages
, loff
);
2931 ret
= gather_extent_pages(dst
, cmp
->dst_pages
, cmp
->num_pages
, dst_loff
);
2935 btrfs_cmp_data_free(cmp
);
2939 static int btrfs_cmp_data(struct inode
*src
, u64 loff
, struct inode
*dst
,
2940 u64 dst_loff
, u64 len
, struct cmp_pages
*cmp
)
2944 struct page
*src_page
, *dst_page
;
2945 unsigned int cmp_len
= PAGE_CACHE_SIZE
;
2946 void *addr
, *dst_addr
;
2950 if (len
< PAGE_CACHE_SIZE
)
2953 BUG_ON(i
>= cmp
->num_pages
);
2955 src_page
= cmp
->src_pages
[i
];
2956 dst_page
= cmp
->dst_pages
[i
];
2958 addr
= kmap_atomic(src_page
);
2959 dst_addr
= kmap_atomic(dst_page
);
2961 flush_dcache_page(src_page
);
2962 flush_dcache_page(dst_page
);
2964 if (memcmp(addr
, dst_addr
, cmp_len
))
2967 kunmap_atomic(addr
);
2968 kunmap_atomic(dst_addr
);
2980 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64
*plen
,
2984 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
2986 if (off
+ olen
> inode
->i_size
|| off
+ olen
< off
)
2989 /* if we extend to eof, continue to block boundary */
2990 if (off
+ len
== inode
->i_size
)
2991 *plen
= len
= ALIGN(inode
->i_size
, bs
) - off
;
2993 /* Check that we are block aligned - btrfs_clone() requires this */
2994 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
3000 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 olen
,
3001 struct inode
*dst
, u64 dst_loff
)
3005 struct cmp_pages cmp
;
3007 u64 same_lock_start
= 0;
3008 u64 same_lock_len
= 0;
3017 mutex_lock(&src
->i_mutex
);
3019 ret
= extent_same_check_offsets(src
, loff
, &len
, olen
);
3024 * Single inode case wants the same checks, except we
3025 * don't want our length pushed out past i_size as
3026 * comparing that data range makes no sense.
3028 * extent_same_check_offsets() will do this for an
3029 * unaligned length at i_size, so catch it here and
3030 * reject the request.
3032 * This effectively means we require aligned extents
3033 * for the single-inode case, whereas the other cases
3034 * allow an unaligned length so long as it ends at
3042 /* Check for overlapping ranges */
3043 if (dst_loff
+ len
> loff
&& dst_loff
< loff
+ len
) {
3048 same_lock_start
= min_t(u64
, loff
, dst_loff
);
3049 same_lock_len
= max_t(u64
, loff
, dst_loff
) + len
- same_lock_start
;
3051 btrfs_double_inode_lock(src
, dst
);
3053 ret
= extent_same_check_offsets(src
, loff
, &len
, olen
);
3057 ret
= extent_same_check_offsets(dst
, dst_loff
, &len
, olen
);
3062 /* don't make the dst file partly checksummed */
3063 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3064 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
3069 ret
= btrfs_cmp_data_prepare(src
, loff
, dst
, dst_loff
, olen
, &cmp
);
3074 lock_extent_range(src
, same_lock_start
, same_lock_len
);
3076 btrfs_double_extent_lock(src
, loff
, dst
, dst_loff
, len
);
3078 /* pass original length for comparison so we stay within i_size */
3079 ret
= btrfs_cmp_data(src
, loff
, dst
, dst_loff
, olen
, &cmp
);
3081 ret
= btrfs_clone(src
, dst
, loff
, olen
, len
, dst_loff
, 1);
3084 unlock_extent(&BTRFS_I(src
)->io_tree
, same_lock_start
,
3085 same_lock_start
+ same_lock_len
- 1);
3087 btrfs_double_extent_unlock(src
, loff
, dst
, dst_loff
, len
);
3089 btrfs_cmp_data_free(&cmp
);
3092 mutex_unlock(&src
->i_mutex
);
3094 btrfs_double_inode_unlock(src
, dst
);
3099 #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
3101 ssize_t
btrfs_dedupe_file_range(struct file
*src_file
, u64 loff
, u64 olen
,
3102 struct file
*dst_file
, u64 dst_loff
)
3104 struct inode
*src
= file_inode(src_file
);
3105 struct inode
*dst
= file_inode(dst_file
);
3106 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
3109 if (olen
> BTRFS_MAX_DEDUPE_LEN
)
3110 olen
= BTRFS_MAX_DEDUPE_LEN
;
3112 if (WARN_ON_ONCE(bs
< PAGE_CACHE_SIZE
)) {
3114 * Btrfs does not support blocksize < page_size. As a
3115 * result, btrfs_cmp_data() won't correctly handle
3116 * this situation without an update.
3121 res
= btrfs_extent_same(src
, loff
, olen
, dst
, dst_loff
);
3127 static int clone_finish_inode_update(struct btrfs_trans_handle
*trans
,
3128 struct inode
*inode
,
3134 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3137 inode_inc_iversion(inode
);
3138 if (!no_time_update
)
3139 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3141 * We round up to the block size at eof when determining which
3142 * extents to clone above, but shouldn't round up the file size.
3144 if (endoff
> destoff
+ olen
)
3145 endoff
= destoff
+ olen
;
3146 if (endoff
> inode
->i_size
)
3147 btrfs_i_size_write(inode
, endoff
);
3149 ret
= btrfs_update_inode(trans
, root
, inode
);
3151 btrfs_abort_transaction(trans
, root
, ret
);
3152 btrfs_end_transaction(trans
, root
);
3155 ret
= btrfs_end_transaction(trans
, root
);
3160 static void clone_update_extent_map(struct inode
*inode
,
3161 const struct btrfs_trans_handle
*trans
,
3162 const struct btrfs_path
*path
,
3163 const u64 hole_offset
,
3166 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
3167 struct extent_map
*em
;
3170 em
= alloc_extent_map();
3172 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3173 &BTRFS_I(inode
)->runtime_flags
);
3178 struct btrfs_file_extent_item
*fi
;
3180 fi
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3181 struct btrfs_file_extent_item
);
3182 btrfs_extent_item_to_extent_map(inode
, path
, fi
, false, em
);
3183 em
->generation
= -1;
3184 if (btrfs_file_extent_type(path
->nodes
[0], fi
) ==
3185 BTRFS_FILE_EXTENT_INLINE
)
3186 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3187 &BTRFS_I(inode
)->runtime_flags
);
3189 em
->start
= hole_offset
;
3191 em
->ram_bytes
= em
->len
;
3192 em
->orig_start
= hole_offset
;
3193 em
->block_start
= EXTENT_MAP_HOLE
;
3195 em
->orig_block_len
= 0;
3196 em
->compress_type
= BTRFS_COMPRESS_NONE
;
3197 em
->generation
= trans
->transid
;
3201 write_lock(&em_tree
->lock
);
3202 ret
= add_extent_mapping(em_tree
, em
, 1);
3203 write_unlock(&em_tree
->lock
);
3204 if (ret
!= -EEXIST
) {
3205 free_extent_map(em
);
3208 btrfs_drop_extent_cache(inode
, em
->start
,
3209 em
->start
+ em
->len
- 1, 0);
3213 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3214 &BTRFS_I(inode
)->runtime_flags
);
3218 * Make sure we do not end up inserting an inline extent into a file that has
3219 * already other (non-inline) extents. If a file has an inline extent it can
3220 * not have any other extents and the (single) inline extent must start at the
3221 * file offset 0. Failing to respect these rules will lead to file corruption,
3222 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3224 * We can have extents that have been already written to disk or we can have
3225 * dirty ranges still in delalloc, in which case the extent maps and items are
3226 * created only when we run delalloc, and the delalloc ranges might fall outside
3227 * the range we are currently locking in the inode's io tree. So we check the
3228 * inode's i_size because of that (i_size updates are done while holding the
3229 * i_mutex, which we are holding here).
3230 * We also check to see if the inode has a size not greater than "datal" but has
3231 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3232 * protected against such concurrent fallocate calls by the i_mutex).
3234 * If the file has no extents but a size greater than datal, do not allow the
3235 * copy because we would need turn the inline extent into a non-inline one (even
3236 * with NO_HOLES enabled). If we find our destination inode only has one inline
3237 * extent, just overwrite it with the source inline extent if its size is less
3238 * than the source extent's size, or we could copy the source inline extent's
3239 * data into the destination inode's inline extent if the later is greater then
3242 static int clone_copy_inline_extent(struct inode
*src
,
3244 struct btrfs_trans_handle
*trans
,
3245 struct btrfs_path
*path
,
3246 struct btrfs_key
*new_key
,
3247 const u64 drop_start
,
3253 struct btrfs_root
*root
= BTRFS_I(dst
)->root
;
3254 const u64 aligned_end
= ALIGN(new_key
->offset
+ datal
,
3257 struct btrfs_key key
;
3259 if (new_key
->offset
> 0)
3262 key
.objectid
= btrfs_ino(dst
);
3263 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3265 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3268 } else if (ret
> 0) {
3269 if (path
->slots
[0] >= btrfs_header_nritems(path
->nodes
[0])) {
3270 ret
= btrfs_next_leaf(root
, path
);
3274 goto copy_inline_extent
;
3276 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
3277 if (key
.objectid
== btrfs_ino(dst
) &&
3278 key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3279 ASSERT(key
.offset
> 0);
3282 } else if (i_size_read(dst
) <= datal
) {
3283 struct btrfs_file_extent_item
*ei
;
3287 * If the file size is <= datal, make sure there are no other
3288 * extents following (can happen do to an fallocate call with
3289 * the flag FALLOC_FL_KEEP_SIZE).
3291 ei
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3292 struct btrfs_file_extent_item
);
3294 * If it's an inline extent, it can not have other extents
3297 if (btrfs_file_extent_type(path
->nodes
[0], ei
) ==
3298 BTRFS_FILE_EXTENT_INLINE
)
3299 goto copy_inline_extent
;
3301 ext_len
= btrfs_file_extent_num_bytes(path
->nodes
[0], ei
);
3302 if (ext_len
> aligned_end
)
3305 ret
= btrfs_next_item(root
, path
);
3308 } else if (ret
== 0) {
3309 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3311 if (key
.objectid
== btrfs_ino(dst
) &&
3312 key
.type
== BTRFS_EXTENT_DATA_KEY
)
3319 * We have no extent items, or we have an extent at offset 0 which may
3320 * or may not be inlined. All these cases are dealt the same way.
3322 if (i_size_read(dst
) > datal
) {
3324 * If the destination inode has an inline extent...
3325 * This would require copying the data from the source inline
3326 * extent into the beginning of the destination's inline extent.
3327 * But this is really complex, both extents can be compressed
3328 * or just one of them, which would require decompressing and
3329 * re-compressing data (which could increase the new compressed
3330 * size, not allowing the compressed data to fit anymore in an
3332 * So just don't support this case for now (it should be rare,
3333 * we are not really saving space when cloning inline extents).
3338 btrfs_release_path(path
);
3339 ret
= btrfs_drop_extents(trans
, root
, dst
, drop_start
, aligned_end
, 1);
3342 ret
= btrfs_insert_empty_item(trans
, root
, path
, new_key
, size
);
3347 const u32 start
= btrfs_file_extent_calc_inline_size(0);
3349 memmove(inline_data
+ start
, inline_data
+ start
+ skip
, datal
);
3352 write_extent_buffer(path
->nodes
[0], inline_data
,
3353 btrfs_item_ptr_offset(path
->nodes
[0],
3356 inode_add_bytes(dst
, datal
);
3362 * btrfs_clone() - clone a range from inode file to another
3364 * @src: Inode to clone from
3365 * @inode: Inode to clone to
3366 * @off: Offset within source to start clone from
3367 * @olen: Original length, passed by user, of range to clone
3368 * @olen_aligned: Block-aligned value of olen
3369 * @destoff: Offset within @inode to start clone
3370 * @no_time_update: Whether to update mtime/ctime on the target inode
3372 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
3373 const u64 off
, const u64 olen
, const u64 olen_aligned
,
3374 const u64 destoff
, int no_time_update
)
3376 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3377 struct btrfs_path
*path
= NULL
;
3378 struct extent_buffer
*leaf
;
3379 struct btrfs_trans_handle
*trans
;
3381 struct btrfs_key key
;
3385 const u64 len
= olen_aligned
;
3386 u64 last_dest_end
= destoff
;
3389 buf
= vmalloc(root
->nodesize
);
3393 path
= btrfs_alloc_path();
3401 key
.objectid
= btrfs_ino(src
);
3402 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3406 u64 next_key_min_offset
= key
.offset
+ 1;
3409 * note the key will change type as we walk through the
3412 path
->leave_spinning
= 1;
3413 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
3418 * First search, if no extent item that starts at offset off was
3419 * found but the previous item is an extent item, it's possible
3420 * it might overlap our target range, therefore process it.
3422 if (key
.offset
== off
&& ret
> 0 && path
->slots
[0] > 0) {
3423 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3424 path
->slots
[0] - 1);
3425 if (key
.type
== BTRFS_EXTENT_DATA_KEY
)
3429 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3431 if (path
->slots
[0] >= nritems
) {
3432 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
3437 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3439 leaf
= path
->nodes
[0];
3440 slot
= path
->slots
[0];
3442 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
3443 if (key
.type
> BTRFS_EXTENT_DATA_KEY
||
3444 key
.objectid
!= btrfs_ino(src
))
3447 if (key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3448 struct btrfs_file_extent_item
*extent
;
3451 struct btrfs_key new_key
;
3452 u64 disko
= 0, diskl
= 0;
3453 u64 datao
= 0, datal
= 0;
3457 extent
= btrfs_item_ptr(leaf
, slot
,
3458 struct btrfs_file_extent_item
);
3459 comp
= btrfs_file_extent_compression(leaf
, extent
);
3460 type
= btrfs_file_extent_type(leaf
, extent
);
3461 if (type
== BTRFS_FILE_EXTENT_REG
||
3462 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3463 disko
= btrfs_file_extent_disk_bytenr(leaf
,
3465 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
3467 datao
= btrfs_file_extent_offset(leaf
, extent
);
3468 datal
= btrfs_file_extent_num_bytes(leaf
,
3470 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3471 /* take upper bound, may be compressed */
3472 datal
= btrfs_file_extent_ram_bytes(leaf
,
3477 * The first search might have left us at an extent
3478 * item that ends before our target range's start, can
3479 * happen if we have holes and NO_HOLES feature enabled.
3481 if (key
.offset
+ datal
<= off
) {
3484 } else if (key
.offset
>= off
+ len
) {
3487 next_key_min_offset
= key
.offset
+ datal
;
3488 size
= btrfs_item_size_nr(leaf
, slot
);
3489 read_extent_buffer(leaf
, buf
,
3490 btrfs_item_ptr_offset(leaf
, slot
),
3493 btrfs_release_path(path
);
3494 path
->leave_spinning
= 0;
3496 memcpy(&new_key
, &key
, sizeof(new_key
));
3497 new_key
.objectid
= btrfs_ino(inode
);
3498 if (off
<= key
.offset
)
3499 new_key
.offset
= key
.offset
+ destoff
- off
;
3501 new_key
.offset
= destoff
;
3504 * Deal with a hole that doesn't have an extent item
3505 * that represents it (NO_HOLES feature enabled).
3506 * This hole is either in the middle of the cloning
3507 * range or at the beginning (fully overlaps it or
3508 * partially overlaps it).
3510 if (new_key
.offset
!= last_dest_end
)
3511 drop_start
= last_dest_end
;
3513 drop_start
= new_key
.offset
;
3516 * 1 - adjusting old extent (we may have to split it)
3517 * 1 - add new extent
3520 trans
= btrfs_start_transaction(root
, 3);
3521 if (IS_ERR(trans
)) {
3522 ret
= PTR_ERR(trans
);
3526 if (type
== BTRFS_FILE_EXTENT_REG
||
3527 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3529 * a | --- range to clone ---| b
3530 * | ------------- extent ------------- |
3533 /* subtract range b */
3534 if (key
.offset
+ datal
> off
+ len
)
3535 datal
= off
+ len
- key
.offset
;
3537 /* subtract range a */
3538 if (off
> key
.offset
) {
3539 datao
+= off
- key
.offset
;
3540 datal
-= off
- key
.offset
;
3543 ret
= btrfs_drop_extents(trans
, root
, inode
,
3545 new_key
.offset
+ datal
,
3548 if (ret
!= -EOPNOTSUPP
)
3549 btrfs_abort_transaction(trans
,
3551 btrfs_end_transaction(trans
, root
);
3555 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3558 btrfs_abort_transaction(trans
, root
,
3560 btrfs_end_transaction(trans
, root
);
3564 leaf
= path
->nodes
[0];
3565 slot
= path
->slots
[0];
3566 write_extent_buffer(leaf
, buf
,
3567 btrfs_item_ptr_offset(leaf
, slot
),
3570 extent
= btrfs_item_ptr(leaf
, slot
,
3571 struct btrfs_file_extent_item
);
3573 /* disko == 0 means it's a hole */
3577 btrfs_set_file_extent_offset(leaf
, extent
,
3579 btrfs_set_file_extent_num_bytes(leaf
, extent
,
3583 inode_add_bytes(inode
, datal
);
3584 ret
= btrfs_inc_extent_ref(trans
, root
,
3586 root
->root_key
.objectid
,
3588 new_key
.offset
- datao
);
3590 btrfs_abort_transaction(trans
,
3593 btrfs_end_transaction(trans
,
3599 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3603 if (off
> key
.offset
) {
3604 skip
= off
- key
.offset
;
3605 new_key
.offset
+= skip
;
3608 if (key
.offset
+ datal
> off
+ len
)
3609 trim
= key
.offset
+ datal
- (off
+ len
);
3611 if (comp
&& (skip
|| trim
)) {
3613 btrfs_end_transaction(trans
, root
);
3616 size
-= skip
+ trim
;
3617 datal
-= skip
+ trim
;
3619 ret
= clone_copy_inline_extent(src
, inode
,
3626 if (ret
!= -EOPNOTSUPP
)
3627 btrfs_abort_transaction(trans
,
3630 btrfs_end_transaction(trans
, root
);
3633 leaf
= path
->nodes
[0];
3634 slot
= path
->slots
[0];
3637 /* If we have an implicit hole (NO_HOLES feature). */
3638 if (drop_start
< new_key
.offset
)
3639 clone_update_extent_map(inode
, trans
,
3641 new_key
.offset
- drop_start
);
3643 clone_update_extent_map(inode
, trans
, path
, 0, 0);
3645 btrfs_mark_buffer_dirty(leaf
);
3646 btrfs_release_path(path
);
3648 last_dest_end
= ALIGN(new_key
.offset
+ datal
,
3650 ret
= clone_finish_inode_update(trans
, inode
,
3656 if (new_key
.offset
+ datal
>= destoff
+ len
)
3659 btrfs_release_path(path
);
3660 key
.offset
= next_key_min_offset
;
3664 if (last_dest_end
< destoff
+ len
) {
3666 * We have an implicit hole (NO_HOLES feature is enabled) that
3667 * fully or partially overlaps our cloning range at its end.
3669 btrfs_release_path(path
);
3672 * 1 - remove extent(s)
3675 trans
= btrfs_start_transaction(root
, 2);
3676 if (IS_ERR(trans
)) {
3677 ret
= PTR_ERR(trans
);
3680 ret
= btrfs_drop_extents(trans
, root
, inode
,
3681 last_dest_end
, destoff
+ len
, 1);
3683 if (ret
!= -EOPNOTSUPP
)
3684 btrfs_abort_transaction(trans
, root
, ret
);
3685 btrfs_end_transaction(trans
, root
);
3688 clone_update_extent_map(inode
, trans
, NULL
, last_dest_end
,
3689 destoff
+ len
- last_dest_end
);
3690 ret
= clone_finish_inode_update(trans
, inode
, destoff
+ len
,
3691 destoff
, olen
, no_time_update
);
3695 btrfs_free_path(path
);
3700 static noinline
int btrfs_clone_files(struct file
*file
, struct file
*file_src
,
3701 u64 off
, u64 olen
, u64 destoff
)
3703 struct inode
*inode
= file_inode(file
);
3704 struct inode
*src
= file_inode(file_src
);
3705 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3708 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
3709 int same_inode
= src
== inode
;
3713 * - split compressed inline extents. annoying: we need to
3714 * decompress into destination's address_space (the file offset
3715 * may change, so source mapping won't do), then recompress (or
3716 * otherwise reinsert) a subrange.
3718 * - split destination inode's inline extents. The inline extents can
3719 * be either compressed or non-compressed.
3722 if (btrfs_root_readonly(root
))
3725 if (file_src
->f_path
.mnt
!= file
->f_path
.mnt
||
3726 src
->i_sb
!= inode
->i_sb
)
3729 /* don't make the dst file partly checksummed */
3730 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3731 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
))
3734 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
3738 btrfs_double_inode_lock(src
, inode
);
3740 mutex_lock(&src
->i_mutex
);
3743 /* determine range to clone */
3745 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
3748 olen
= len
= src
->i_size
- off
;
3749 /* if we extend to eof, continue to block boundary */
3750 if (off
+ len
== src
->i_size
)
3751 len
= ALIGN(src
->i_size
, bs
) - off
;
3758 /* verify the end result is block aligned */
3759 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
3760 !IS_ALIGNED(destoff
, bs
))
3763 /* verify if ranges are overlapped within the same file */
3765 if (destoff
+ len
> off
&& destoff
< off
+ len
)
3769 if (destoff
> inode
->i_size
) {
3770 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
3776 * Lock the target range too. Right after we replace the file extent
3777 * items in the fs tree (which now point to the cloned data), we might
3778 * have a worker replace them with extent items relative to a write
3779 * operation that was issued before this clone operation (i.e. confront
3780 * with inode.c:btrfs_finish_ordered_io).
3783 u64 lock_start
= min_t(u64
, off
, destoff
);
3784 u64 lock_len
= max_t(u64
, off
, destoff
) + len
- lock_start
;
3786 lock_extent_range(src
, lock_start
, lock_len
);
3788 btrfs_double_extent_lock(src
, off
, inode
, destoff
, len
);
3791 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
, 0);
3794 u64 lock_start
= min_t(u64
, off
, destoff
);
3795 u64 lock_end
= max_t(u64
, off
, destoff
) + len
- 1;
3797 unlock_extent(&BTRFS_I(src
)->io_tree
, lock_start
, lock_end
);
3799 btrfs_double_extent_unlock(src
, off
, inode
, destoff
, len
);
3802 * Truncate page cache pages so that future reads will see the cloned
3803 * data immediately and not the previous data.
3805 truncate_inode_pages_range(&inode
->i_data
, destoff
,
3806 PAGE_CACHE_ALIGN(destoff
+ len
) - 1);
3809 btrfs_double_inode_unlock(src
, inode
);
3811 mutex_unlock(&src
->i_mutex
);
3815 ssize_t
btrfs_copy_file_range(struct file
*file_in
, loff_t pos_in
,
3816 struct file
*file_out
, loff_t pos_out
,
3817 size_t len
, unsigned int flags
)
3821 ret
= btrfs_clone_files(file_out
, file_in
, pos_in
, len
, pos_out
);
3827 int btrfs_clone_file_range(struct file
*src_file
, loff_t off
,
3828 struct file
*dst_file
, loff_t destoff
, u64 len
)
3830 return btrfs_clone_files(dst_file
, src_file
, off
, len
, destoff
);
3834 * there are many ways the trans_start and trans_end ioctls can lead
3835 * to deadlocks. They should only be used by applications that
3836 * basically own the machine, and have a very in depth understanding
3837 * of all the possible deadlocks and enospc problems.
3839 static long btrfs_ioctl_trans_start(struct file
*file
)
3841 struct inode
*inode
= file_inode(file
);
3842 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3843 struct btrfs_trans_handle
*trans
;
3847 if (!capable(CAP_SYS_ADMIN
))
3851 if (file
->private_data
)
3855 if (btrfs_root_readonly(root
))
3858 ret
= mnt_want_write_file(file
);
3862 atomic_inc(&root
->fs_info
->open_ioctl_trans
);
3865 trans
= btrfs_start_ioctl_transaction(root
);
3869 file
->private_data
= trans
;
3873 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3874 mnt_drop_write_file(file
);
3879 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3881 struct inode
*inode
= file_inode(file
);
3882 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3883 struct btrfs_root
*new_root
;
3884 struct btrfs_dir_item
*di
;
3885 struct btrfs_trans_handle
*trans
;
3886 struct btrfs_path
*path
;
3887 struct btrfs_key location
;
3888 struct btrfs_disk_key disk_key
;
3893 if (!capable(CAP_SYS_ADMIN
))
3896 ret
= mnt_want_write_file(file
);
3900 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3906 objectid
= BTRFS_FS_TREE_OBJECTID
;
3908 location
.objectid
= objectid
;
3909 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3910 location
.offset
= (u64
)-1;
3912 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
3913 if (IS_ERR(new_root
)) {
3914 ret
= PTR_ERR(new_root
);
3918 path
= btrfs_alloc_path();
3923 path
->leave_spinning
= 1;
3925 trans
= btrfs_start_transaction(root
, 1);
3926 if (IS_ERR(trans
)) {
3927 btrfs_free_path(path
);
3928 ret
= PTR_ERR(trans
);
3932 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
3933 di
= btrfs_lookup_dir_item(trans
, root
->fs_info
->tree_root
, path
,
3934 dir_id
, "default", 7, 1);
3935 if (IS_ERR_OR_NULL(di
)) {
3936 btrfs_free_path(path
);
3937 btrfs_end_transaction(trans
, root
);
3938 btrfs_err(new_root
->fs_info
, "Umm, you don't have the default dir"
3939 "item, this isn't going to work");
3944 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3945 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3946 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3947 btrfs_free_path(path
);
3949 btrfs_set_fs_incompat(root
->fs_info
, DEFAULT_SUBVOL
);
3950 btrfs_end_transaction(trans
, root
);
3952 mnt_drop_write_file(file
);
3956 void btrfs_get_block_group_info(struct list_head
*groups_list
,
3957 struct btrfs_ioctl_space_info
*space
)
3959 struct btrfs_block_group_cache
*block_group
;
3961 space
->total_bytes
= 0;
3962 space
->used_bytes
= 0;
3964 list_for_each_entry(block_group
, groups_list
, list
) {
3965 space
->flags
= block_group
->flags
;
3966 space
->total_bytes
+= block_group
->key
.offset
;
3967 space
->used_bytes
+=
3968 btrfs_block_group_used(&block_group
->item
);
3972 static long btrfs_ioctl_space_info(struct btrfs_root
*root
, void __user
*arg
)
3974 struct btrfs_ioctl_space_args space_args
;
3975 struct btrfs_ioctl_space_info space
;
3976 struct btrfs_ioctl_space_info
*dest
;
3977 struct btrfs_ioctl_space_info
*dest_orig
;
3978 struct btrfs_ioctl_space_info __user
*user_dest
;
3979 struct btrfs_space_info
*info
;
3980 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3981 BTRFS_BLOCK_GROUP_SYSTEM
,
3982 BTRFS_BLOCK_GROUP_METADATA
,
3983 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3990 if (copy_from_user(&space_args
,
3991 (struct btrfs_ioctl_space_args __user
*)arg
,
3992 sizeof(space_args
)))
3995 for (i
= 0; i
< num_types
; i
++) {
3996 struct btrfs_space_info
*tmp
;
4000 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
4002 if (tmp
->flags
== types
[i
]) {
4012 down_read(&info
->groups_sem
);
4013 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
4014 if (!list_empty(&info
->block_groups
[c
]))
4017 up_read(&info
->groups_sem
);
4021 * Global block reserve, exported as a space_info
4025 /* space_slots == 0 means they are asking for a count */
4026 if (space_args
.space_slots
== 0) {
4027 space_args
.total_spaces
= slot_count
;
4031 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
4033 alloc_size
= sizeof(*dest
) * slot_count
;
4035 /* we generally have at most 6 or so space infos, one for each raid
4036 * level. So, a whole page should be more than enough for everyone
4038 if (alloc_size
> PAGE_CACHE_SIZE
)
4041 space_args
.total_spaces
= 0;
4042 dest
= kmalloc(alloc_size
, GFP_NOFS
);
4047 /* now we have a buffer to copy into */
4048 for (i
= 0; i
< num_types
; i
++) {
4049 struct btrfs_space_info
*tmp
;
4056 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
4058 if (tmp
->flags
== types
[i
]) {
4067 down_read(&info
->groups_sem
);
4068 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
4069 if (!list_empty(&info
->block_groups
[c
])) {
4070 btrfs_get_block_group_info(
4071 &info
->block_groups
[c
], &space
);
4072 memcpy(dest
, &space
, sizeof(space
));
4074 space_args
.total_spaces
++;
4080 up_read(&info
->groups_sem
);
4084 * Add global block reserve
4087 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->global_block_rsv
;
4089 spin_lock(&block_rsv
->lock
);
4090 space
.total_bytes
= block_rsv
->size
;
4091 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
4092 spin_unlock(&block_rsv
->lock
);
4093 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
4094 memcpy(dest
, &space
, sizeof(space
));
4095 space_args
.total_spaces
++;
4098 user_dest
= (struct btrfs_ioctl_space_info __user
*)
4099 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
4101 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
4106 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
4113 * there are many ways the trans_start and trans_end ioctls can lead
4114 * to deadlocks. They should only be used by applications that
4115 * basically own the machine, and have a very in depth understanding
4116 * of all the possible deadlocks and enospc problems.
4118 long btrfs_ioctl_trans_end(struct file
*file
)
4120 struct inode
*inode
= file_inode(file
);
4121 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4122 struct btrfs_trans_handle
*trans
;
4124 trans
= file
->private_data
;
4127 file
->private_data
= NULL
;
4129 btrfs_end_transaction(trans
, root
);
4131 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
4133 mnt_drop_write_file(file
);
4137 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
4140 struct btrfs_trans_handle
*trans
;
4144 trans
= btrfs_attach_transaction_barrier(root
);
4145 if (IS_ERR(trans
)) {
4146 if (PTR_ERR(trans
) != -ENOENT
)
4147 return PTR_ERR(trans
);
4149 /* No running transaction, don't bother */
4150 transid
= root
->fs_info
->last_trans_committed
;
4153 transid
= trans
->transid
;
4154 ret
= btrfs_commit_transaction_async(trans
, root
, 0);
4156 btrfs_end_transaction(trans
, root
);
4161 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
4166 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_root
*root
,
4172 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
4175 transid
= 0; /* current trans */
4177 return btrfs_wait_for_commit(root
, transid
);
4180 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
4182 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4183 struct btrfs_ioctl_scrub_args
*sa
;
4186 if (!capable(CAP_SYS_ADMIN
))
4189 sa
= memdup_user(arg
, sizeof(*sa
));
4193 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
4194 ret
= mnt_want_write_file(file
);
4199 ret
= btrfs_scrub_dev(root
->fs_info
, sa
->devid
, sa
->start
, sa
->end
,
4200 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
4203 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4206 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
4207 mnt_drop_write_file(file
);
4213 static long btrfs_ioctl_scrub_cancel(struct btrfs_root
*root
, void __user
*arg
)
4215 if (!capable(CAP_SYS_ADMIN
))
4218 return btrfs_scrub_cancel(root
->fs_info
);
4221 static long btrfs_ioctl_scrub_progress(struct btrfs_root
*root
,
4224 struct btrfs_ioctl_scrub_args
*sa
;
4227 if (!capable(CAP_SYS_ADMIN
))
4230 sa
= memdup_user(arg
, sizeof(*sa
));
4234 ret
= btrfs_scrub_progress(root
, sa
->devid
, &sa
->progress
);
4236 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4243 static long btrfs_ioctl_get_dev_stats(struct btrfs_root
*root
,
4246 struct btrfs_ioctl_get_dev_stats
*sa
;
4249 sa
= memdup_user(arg
, sizeof(*sa
));
4253 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
4258 ret
= btrfs_get_dev_stats(root
, sa
);
4260 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4267 static long btrfs_ioctl_dev_replace(struct btrfs_root
*root
, void __user
*arg
)
4269 struct btrfs_ioctl_dev_replace_args
*p
;
4272 if (!capable(CAP_SYS_ADMIN
))
4275 p
= memdup_user(arg
, sizeof(*p
));
4280 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
4281 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
) {
4286 &root
->fs_info
->mutually_exclusive_operation_running
,
4288 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4290 ret
= btrfs_dev_replace_start(root
, p
);
4292 &root
->fs_info
->mutually_exclusive_operation_running
,
4296 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
4297 btrfs_dev_replace_status(root
->fs_info
, p
);
4300 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
4301 ret
= btrfs_dev_replace_cancel(root
->fs_info
, p
);
4308 if (copy_to_user(arg
, p
, sizeof(*p
)))
4315 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
4321 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
4322 struct inode_fs_paths
*ipath
= NULL
;
4323 struct btrfs_path
*path
;
4325 if (!capable(CAP_DAC_READ_SEARCH
))
4328 path
= btrfs_alloc_path();
4334 ipa
= memdup_user(arg
, sizeof(*ipa
));
4341 size
= min_t(u32
, ipa
->size
, 4096);
4342 ipath
= init_ipath(size
, root
, path
);
4343 if (IS_ERR(ipath
)) {
4344 ret
= PTR_ERR(ipath
);
4349 ret
= paths_from_inode(ipa
->inum
, ipath
);
4353 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
4354 rel_ptr
= ipath
->fspath
->val
[i
] -
4355 (u64
)(unsigned long)ipath
->fspath
->val
;
4356 ipath
->fspath
->val
[i
] = rel_ptr
;
4359 ret
= copy_to_user((void *)(unsigned long)ipa
->fspath
,
4360 (void *)(unsigned long)ipath
->fspath
, size
);
4367 btrfs_free_path(path
);
4374 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
4376 struct btrfs_data_container
*inodes
= ctx
;
4377 const size_t c
= 3 * sizeof(u64
);
4379 if (inodes
->bytes_left
>= c
) {
4380 inodes
->bytes_left
-= c
;
4381 inodes
->val
[inodes
->elem_cnt
] = inum
;
4382 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
4383 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
4384 inodes
->elem_cnt
+= 3;
4386 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
4387 inodes
->bytes_left
= 0;
4388 inodes
->elem_missed
+= 3;
4394 static long btrfs_ioctl_logical_to_ino(struct btrfs_root
*root
,
4399 struct btrfs_ioctl_logical_ino_args
*loi
;
4400 struct btrfs_data_container
*inodes
= NULL
;
4401 struct btrfs_path
*path
= NULL
;
4403 if (!capable(CAP_SYS_ADMIN
))
4406 loi
= memdup_user(arg
, sizeof(*loi
));
4413 path
= btrfs_alloc_path();
4419 size
= min_t(u32
, loi
->size
, 64 * 1024);
4420 inodes
= init_data_container(size
);
4421 if (IS_ERR(inodes
)) {
4422 ret
= PTR_ERR(inodes
);
4427 ret
= iterate_inodes_from_logical(loi
->logical
, root
->fs_info
, path
,
4428 build_ino_list
, inodes
);
4434 ret
= copy_to_user((void *)(unsigned long)loi
->inodes
,
4435 (void *)(unsigned long)inodes
, size
);
4440 btrfs_free_path(path
);
4447 void update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
, int lock
,
4448 struct btrfs_ioctl_balance_args
*bargs
)
4450 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4452 bargs
->flags
= bctl
->flags
;
4454 if (atomic_read(&fs_info
->balance_running
))
4455 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
4456 if (atomic_read(&fs_info
->balance_pause_req
))
4457 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
4458 if (atomic_read(&fs_info
->balance_cancel_req
))
4459 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
4461 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
4462 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
4463 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
4466 spin_lock(&fs_info
->balance_lock
);
4467 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4468 spin_unlock(&fs_info
->balance_lock
);
4470 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4474 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
4476 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4477 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4478 struct btrfs_ioctl_balance_args
*bargs
;
4479 struct btrfs_balance_control
*bctl
;
4480 bool need_unlock
; /* for mut. excl. ops lock */
4483 if (!capable(CAP_SYS_ADMIN
))
4486 ret
= mnt_want_write_file(file
);
4491 if (!atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
4492 mutex_lock(&fs_info
->volume_mutex
);
4493 mutex_lock(&fs_info
->balance_mutex
);
4499 * mut. excl. ops lock is locked. Three possibilites:
4500 * (1) some other op is running
4501 * (2) balance is running
4502 * (3) balance is paused -- special case (think resume)
4504 mutex_lock(&fs_info
->balance_mutex
);
4505 if (fs_info
->balance_ctl
) {
4506 /* this is either (2) or (3) */
4507 if (!atomic_read(&fs_info
->balance_running
)) {
4508 mutex_unlock(&fs_info
->balance_mutex
);
4509 if (!mutex_trylock(&fs_info
->volume_mutex
))
4511 mutex_lock(&fs_info
->balance_mutex
);
4513 if (fs_info
->balance_ctl
&&
4514 !atomic_read(&fs_info
->balance_running
)) {
4516 need_unlock
= false;
4520 mutex_unlock(&fs_info
->balance_mutex
);
4521 mutex_unlock(&fs_info
->volume_mutex
);
4525 mutex_unlock(&fs_info
->balance_mutex
);
4531 mutex_unlock(&fs_info
->balance_mutex
);
4532 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4537 BUG_ON(!atomic_read(&fs_info
->mutually_exclusive_operation_running
));
4540 bargs
= memdup_user(arg
, sizeof(*bargs
));
4541 if (IS_ERR(bargs
)) {
4542 ret
= PTR_ERR(bargs
);
4546 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
4547 if (!fs_info
->balance_ctl
) {
4552 bctl
= fs_info
->balance_ctl
;
4553 spin_lock(&fs_info
->balance_lock
);
4554 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4555 spin_unlock(&fs_info
->balance_lock
);
4563 if (fs_info
->balance_ctl
) {
4568 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
4574 bctl
->fs_info
= fs_info
;
4576 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4577 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4578 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4580 bctl
->flags
= bargs
->flags
;
4582 /* balance everything - no filters */
4583 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4586 if (bctl
->flags
& ~(BTRFS_BALANCE_ARGS_MASK
| BTRFS_BALANCE_TYPE_MASK
)) {
4593 * Ownership of bctl and mutually_exclusive_operation_running
4594 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4595 * or, if restriper was paused all the way until unmount, in
4596 * free_fs_info. mutually_exclusive_operation_running is
4597 * cleared in __cancel_balance.
4599 need_unlock
= false;
4601 ret
= btrfs_balance(bctl
, bargs
);
4605 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4614 mutex_unlock(&fs_info
->balance_mutex
);
4615 mutex_unlock(&fs_info
->volume_mutex
);
4617 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
4619 mnt_drop_write_file(file
);
4623 static long btrfs_ioctl_balance_ctl(struct btrfs_root
*root
, int cmd
)
4625 if (!capable(CAP_SYS_ADMIN
))
4629 case BTRFS_BALANCE_CTL_PAUSE
:
4630 return btrfs_pause_balance(root
->fs_info
);
4631 case BTRFS_BALANCE_CTL_CANCEL
:
4632 return btrfs_cancel_balance(root
->fs_info
);
4638 static long btrfs_ioctl_balance_progress(struct btrfs_root
*root
,
4641 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4642 struct btrfs_ioctl_balance_args
*bargs
;
4645 if (!capable(CAP_SYS_ADMIN
))
4648 mutex_lock(&fs_info
->balance_mutex
);
4649 if (!fs_info
->balance_ctl
) {
4654 bargs
= kzalloc(sizeof(*bargs
), GFP_NOFS
);
4660 update_ioctl_balance_args(fs_info
, 1, bargs
);
4662 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4667 mutex_unlock(&fs_info
->balance_mutex
);
4671 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4673 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4674 struct btrfs_ioctl_quota_ctl_args
*sa
;
4675 struct btrfs_trans_handle
*trans
= NULL
;
4679 if (!capable(CAP_SYS_ADMIN
))
4682 ret
= mnt_want_write_file(file
);
4686 sa
= memdup_user(arg
, sizeof(*sa
));
4692 down_write(&root
->fs_info
->subvol_sem
);
4693 trans
= btrfs_start_transaction(root
->fs_info
->tree_root
, 2);
4694 if (IS_ERR(trans
)) {
4695 ret
= PTR_ERR(trans
);
4700 case BTRFS_QUOTA_CTL_ENABLE
:
4701 ret
= btrfs_quota_enable(trans
, root
->fs_info
);
4703 case BTRFS_QUOTA_CTL_DISABLE
:
4704 ret
= btrfs_quota_disable(trans
, root
->fs_info
);
4711 err
= btrfs_commit_transaction(trans
, root
->fs_info
->tree_root
);
4716 up_write(&root
->fs_info
->subvol_sem
);
4718 mnt_drop_write_file(file
);
4722 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4724 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4725 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4726 struct btrfs_trans_handle
*trans
;
4730 if (!capable(CAP_SYS_ADMIN
))
4733 ret
= mnt_want_write_file(file
);
4737 sa
= memdup_user(arg
, sizeof(*sa
));
4743 trans
= btrfs_join_transaction(root
);
4744 if (IS_ERR(trans
)) {
4745 ret
= PTR_ERR(trans
);
4749 /* FIXME: check if the IDs really exist */
4751 ret
= btrfs_add_qgroup_relation(trans
, root
->fs_info
,
4754 ret
= btrfs_del_qgroup_relation(trans
, root
->fs_info
,
4758 /* update qgroup status and info */
4759 err
= btrfs_run_qgroups(trans
, root
->fs_info
);
4761 btrfs_std_error(root
->fs_info
, ret
,
4762 "failed to update qgroup status and info\n");
4763 err
= btrfs_end_transaction(trans
, root
);
4770 mnt_drop_write_file(file
);
4774 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4776 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4777 struct btrfs_ioctl_qgroup_create_args
*sa
;
4778 struct btrfs_trans_handle
*trans
;
4782 if (!capable(CAP_SYS_ADMIN
))
4785 ret
= mnt_want_write_file(file
);
4789 sa
= memdup_user(arg
, sizeof(*sa
));
4795 if (!sa
->qgroupid
) {
4800 trans
= btrfs_join_transaction(root
);
4801 if (IS_ERR(trans
)) {
4802 ret
= PTR_ERR(trans
);
4806 /* FIXME: check if the IDs really exist */
4808 ret
= btrfs_create_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4810 ret
= btrfs_remove_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4813 err
= btrfs_end_transaction(trans
, root
);
4820 mnt_drop_write_file(file
);
4824 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4826 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4827 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4828 struct btrfs_trans_handle
*trans
;
4833 if (!capable(CAP_SYS_ADMIN
))
4836 ret
= mnt_want_write_file(file
);
4840 sa
= memdup_user(arg
, sizeof(*sa
));
4846 trans
= btrfs_join_transaction(root
);
4847 if (IS_ERR(trans
)) {
4848 ret
= PTR_ERR(trans
);
4852 qgroupid
= sa
->qgroupid
;
4854 /* take the current subvol as qgroup */
4855 qgroupid
= root
->root_key
.objectid
;
4858 /* FIXME: check if the IDs really exist */
4859 ret
= btrfs_limit_qgroup(trans
, root
->fs_info
, qgroupid
, &sa
->lim
);
4861 err
= btrfs_end_transaction(trans
, root
);
4868 mnt_drop_write_file(file
);
4872 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4874 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4875 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4878 if (!capable(CAP_SYS_ADMIN
))
4881 ret
= mnt_want_write_file(file
);
4885 qsa
= memdup_user(arg
, sizeof(*qsa
));
4896 ret
= btrfs_qgroup_rescan(root
->fs_info
);
4901 mnt_drop_write_file(file
);
4905 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
4907 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4908 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4911 if (!capable(CAP_SYS_ADMIN
))
4914 qsa
= kzalloc(sizeof(*qsa
), GFP_NOFS
);
4918 if (root
->fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4920 qsa
->progress
= root
->fs_info
->qgroup_rescan_progress
.objectid
;
4923 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
4930 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
4932 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4934 if (!capable(CAP_SYS_ADMIN
))
4937 return btrfs_qgroup_wait_for_completion(root
->fs_info
);
4940 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
4941 struct btrfs_ioctl_received_subvol_args
*sa
)
4943 struct inode
*inode
= file_inode(file
);
4944 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4945 struct btrfs_root_item
*root_item
= &root
->root_item
;
4946 struct btrfs_trans_handle
*trans
;
4947 struct timespec ct
= CURRENT_TIME
;
4949 int received_uuid_changed
;
4951 if (!inode_owner_or_capable(inode
))
4954 ret
= mnt_want_write_file(file
);
4958 down_write(&root
->fs_info
->subvol_sem
);
4960 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
4965 if (btrfs_root_readonly(root
)) {
4972 * 2 - uuid items (received uuid + subvol uuid)
4974 trans
= btrfs_start_transaction(root
, 3);
4975 if (IS_ERR(trans
)) {
4976 ret
= PTR_ERR(trans
);
4981 sa
->rtransid
= trans
->transid
;
4982 sa
->rtime
.sec
= ct
.tv_sec
;
4983 sa
->rtime
.nsec
= ct
.tv_nsec
;
4985 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4987 if (received_uuid_changed
&&
4988 !btrfs_is_empty_uuid(root_item
->received_uuid
))
4989 btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
4990 root_item
->received_uuid
,
4991 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4992 root
->root_key
.objectid
);
4993 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4994 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4995 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4996 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4997 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4998 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4999 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
5001 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
5002 &root
->root_key
, &root
->root_item
);
5004 btrfs_end_transaction(trans
, root
);
5007 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
5008 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
5010 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
5011 root
->root_key
.objectid
);
5012 if (ret
< 0 && ret
!= -EEXIST
) {
5013 btrfs_abort_transaction(trans
, root
, ret
);
5017 ret
= btrfs_commit_transaction(trans
, root
);
5019 btrfs_abort_transaction(trans
, root
, ret
);
5024 up_write(&root
->fs_info
->subvol_sem
);
5025 mnt_drop_write_file(file
);
5030 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
5033 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
5034 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
5037 args32
= memdup_user(arg
, sizeof(*args32
));
5038 if (IS_ERR(args32
)) {
5039 ret
= PTR_ERR(args32
);
5044 args64
= kmalloc(sizeof(*args64
), GFP_NOFS
);
5050 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
5051 args64
->stransid
= args32
->stransid
;
5052 args64
->rtransid
= args32
->rtransid
;
5053 args64
->stime
.sec
= args32
->stime
.sec
;
5054 args64
->stime
.nsec
= args32
->stime
.nsec
;
5055 args64
->rtime
.sec
= args32
->rtime
.sec
;
5056 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
5057 args64
->flags
= args32
->flags
;
5059 ret
= _btrfs_ioctl_set_received_subvol(file
, args64
);
5063 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
5064 args32
->stransid
= args64
->stransid
;
5065 args32
->rtransid
= args64
->rtransid
;
5066 args32
->stime
.sec
= args64
->stime
.sec
;
5067 args32
->stime
.nsec
= args64
->stime
.nsec
;
5068 args32
->rtime
.sec
= args64
->rtime
.sec
;
5069 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
5070 args32
->flags
= args64
->flags
;
5072 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
5083 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
5086 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
5089 sa
= memdup_user(arg
, sizeof(*sa
));
5096 ret
= _btrfs_ioctl_set_received_subvol(file
, sa
);
5101 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
5110 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
5112 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5115 char label
[BTRFS_LABEL_SIZE
];
5117 spin_lock(&root
->fs_info
->super_lock
);
5118 memcpy(label
, root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
5119 spin_unlock(&root
->fs_info
->super_lock
);
5121 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
5123 if (len
== BTRFS_LABEL_SIZE
) {
5124 btrfs_warn(root
->fs_info
,
5125 "label is too long, return the first %zu bytes", --len
);
5128 ret
= copy_to_user(arg
, label
, len
);
5130 return ret
? -EFAULT
: 0;
5133 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
5135 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5136 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5137 struct btrfs_trans_handle
*trans
;
5138 char label
[BTRFS_LABEL_SIZE
];
5141 if (!capable(CAP_SYS_ADMIN
))
5144 if (copy_from_user(label
, arg
, sizeof(label
)))
5147 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
5148 btrfs_err(root
->fs_info
, "unable to set label with more than %d bytes",
5149 BTRFS_LABEL_SIZE
- 1);
5153 ret
= mnt_want_write_file(file
);
5157 trans
= btrfs_start_transaction(root
, 0);
5158 if (IS_ERR(trans
)) {
5159 ret
= PTR_ERR(trans
);
5163 spin_lock(&root
->fs_info
->super_lock
);
5164 strcpy(super_block
->label
, label
);
5165 spin_unlock(&root
->fs_info
->super_lock
);
5166 ret
= btrfs_commit_transaction(trans
, root
);
5169 mnt_drop_write_file(file
);
5173 #define INIT_FEATURE_FLAGS(suffix) \
5174 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5175 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5176 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5178 static int btrfs_ioctl_get_supported_features(struct file
*file
,
5181 static struct btrfs_ioctl_feature_flags features
[3] = {
5182 INIT_FEATURE_FLAGS(SUPP
),
5183 INIT_FEATURE_FLAGS(SAFE_SET
),
5184 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
5187 if (copy_to_user(arg
, &features
, sizeof(features
)))
5193 static int btrfs_ioctl_get_features(struct file
*file
, void __user
*arg
)
5195 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5196 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5197 struct btrfs_ioctl_feature_flags features
;
5199 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
5200 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
5201 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
5203 if (copy_to_user(arg
, &features
, sizeof(features
)))
5209 static int check_feature_bits(struct btrfs_root
*root
,
5210 enum btrfs_feature_set set
,
5211 u64 change_mask
, u64 flags
, u64 supported_flags
,
5212 u64 safe_set
, u64 safe_clear
)
5214 const char *type
= btrfs_feature_set_names
[set
];
5216 u64 disallowed
, unsupported
;
5217 u64 set_mask
= flags
& change_mask
;
5218 u64 clear_mask
= ~flags
& change_mask
;
5220 unsupported
= set_mask
& ~supported_flags
;
5222 names
= btrfs_printable_features(set
, unsupported
);
5224 btrfs_warn(root
->fs_info
,
5225 "this kernel does not support the %s feature bit%s",
5226 names
, strchr(names
, ',') ? "s" : "");
5229 btrfs_warn(root
->fs_info
,
5230 "this kernel does not support %s bits 0x%llx",
5235 disallowed
= set_mask
& ~safe_set
;
5237 names
= btrfs_printable_features(set
, disallowed
);
5239 btrfs_warn(root
->fs_info
,
5240 "can't set the %s feature bit%s while mounted",
5241 names
, strchr(names
, ',') ? "s" : "");
5244 btrfs_warn(root
->fs_info
,
5245 "can't set %s bits 0x%llx while mounted",
5250 disallowed
= clear_mask
& ~safe_clear
;
5252 names
= btrfs_printable_features(set
, disallowed
);
5254 btrfs_warn(root
->fs_info
,
5255 "can't clear the %s feature bit%s while mounted",
5256 names
, strchr(names
, ',') ? "s" : "");
5259 btrfs_warn(root
->fs_info
,
5260 "can't clear %s bits 0x%llx while mounted",
5268 #define check_feature(root, change_mask, flags, mask_base) \
5269 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5270 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5271 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5272 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5274 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
5276 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5277 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
5278 struct btrfs_ioctl_feature_flags flags
[2];
5279 struct btrfs_trans_handle
*trans
;
5283 if (!capable(CAP_SYS_ADMIN
))
5286 if (copy_from_user(flags
, arg
, sizeof(flags
)))
5290 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
5291 !flags
[0].incompat_flags
)
5294 ret
= check_feature(root
, flags
[0].compat_flags
,
5295 flags
[1].compat_flags
, COMPAT
);
5299 ret
= check_feature(root
, flags
[0].compat_ro_flags
,
5300 flags
[1].compat_ro_flags
, COMPAT_RO
);
5304 ret
= check_feature(root
, flags
[0].incompat_flags
,
5305 flags
[1].incompat_flags
, INCOMPAT
);
5309 trans
= btrfs_start_transaction(root
, 0);
5311 return PTR_ERR(trans
);
5313 spin_lock(&root
->fs_info
->super_lock
);
5314 newflags
= btrfs_super_compat_flags(super_block
);
5315 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
5316 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
5317 btrfs_set_super_compat_flags(super_block
, newflags
);
5319 newflags
= btrfs_super_compat_ro_flags(super_block
);
5320 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
5321 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
5322 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
5324 newflags
= btrfs_super_incompat_flags(super_block
);
5325 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
5326 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
5327 btrfs_set_super_incompat_flags(super_block
, newflags
);
5328 spin_unlock(&root
->fs_info
->super_lock
);
5330 return btrfs_commit_transaction(trans
, root
);
5333 long btrfs_ioctl(struct file
*file
, unsigned int
5334 cmd
, unsigned long arg
)
5336 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
5337 void __user
*argp
= (void __user
*)arg
;
5340 case FS_IOC_GETFLAGS
:
5341 return btrfs_ioctl_getflags(file
, argp
);
5342 case FS_IOC_SETFLAGS
:
5343 return btrfs_ioctl_setflags(file
, argp
);
5344 case FS_IOC_GETVERSION
:
5345 return btrfs_ioctl_getversion(file
, argp
);
5347 return btrfs_ioctl_fitrim(file
, argp
);
5348 case BTRFS_IOC_SNAP_CREATE
:
5349 return btrfs_ioctl_snap_create(file
, argp
, 0);
5350 case BTRFS_IOC_SNAP_CREATE_V2
:
5351 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
5352 case BTRFS_IOC_SUBVOL_CREATE
:
5353 return btrfs_ioctl_snap_create(file
, argp
, 1);
5354 case BTRFS_IOC_SUBVOL_CREATE_V2
:
5355 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
5356 case BTRFS_IOC_SNAP_DESTROY
:
5357 return btrfs_ioctl_snap_destroy(file
, argp
);
5358 case BTRFS_IOC_SUBVOL_GETFLAGS
:
5359 return btrfs_ioctl_subvol_getflags(file
, argp
);
5360 case BTRFS_IOC_SUBVOL_SETFLAGS
:
5361 return btrfs_ioctl_subvol_setflags(file
, argp
);
5362 case BTRFS_IOC_DEFAULT_SUBVOL
:
5363 return btrfs_ioctl_default_subvol(file
, argp
);
5364 case BTRFS_IOC_DEFRAG
:
5365 return btrfs_ioctl_defrag(file
, NULL
);
5366 case BTRFS_IOC_DEFRAG_RANGE
:
5367 return btrfs_ioctl_defrag(file
, argp
);
5368 case BTRFS_IOC_RESIZE
:
5369 return btrfs_ioctl_resize(file
, argp
);
5370 case BTRFS_IOC_ADD_DEV
:
5371 return btrfs_ioctl_add_dev(root
, argp
);
5372 case BTRFS_IOC_RM_DEV
:
5373 return btrfs_ioctl_rm_dev(file
, argp
);
5374 case BTRFS_IOC_FS_INFO
:
5375 return btrfs_ioctl_fs_info(root
, argp
);
5376 case BTRFS_IOC_DEV_INFO
:
5377 return btrfs_ioctl_dev_info(root
, argp
);
5378 case BTRFS_IOC_BALANCE
:
5379 return btrfs_ioctl_balance(file
, NULL
);
5380 case BTRFS_IOC_TRANS_START
:
5381 return btrfs_ioctl_trans_start(file
);
5382 case BTRFS_IOC_TRANS_END
:
5383 return btrfs_ioctl_trans_end(file
);
5384 case BTRFS_IOC_TREE_SEARCH
:
5385 return btrfs_ioctl_tree_search(file
, argp
);
5386 case BTRFS_IOC_TREE_SEARCH_V2
:
5387 return btrfs_ioctl_tree_search_v2(file
, argp
);
5388 case BTRFS_IOC_INO_LOOKUP
:
5389 return btrfs_ioctl_ino_lookup(file
, argp
);
5390 case BTRFS_IOC_INO_PATHS
:
5391 return btrfs_ioctl_ino_to_path(root
, argp
);
5392 case BTRFS_IOC_LOGICAL_INO
:
5393 return btrfs_ioctl_logical_to_ino(root
, argp
);
5394 case BTRFS_IOC_SPACE_INFO
:
5395 return btrfs_ioctl_space_info(root
, argp
);
5396 case BTRFS_IOC_SYNC
: {
5399 ret
= btrfs_start_delalloc_roots(root
->fs_info
, 0, -1);
5402 ret
= btrfs_sync_fs(file_inode(file
)->i_sb
, 1);
5404 * The transaction thread may want to do more work,
5405 * namely it pokes the cleaner ktread that will start
5406 * processing uncleaned subvols.
5408 wake_up_process(root
->fs_info
->transaction_kthread
);
5411 case BTRFS_IOC_START_SYNC
:
5412 return btrfs_ioctl_start_sync(root
, argp
);
5413 case BTRFS_IOC_WAIT_SYNC
:
5414 return btrfs_ioctl_wait_sync(root
, argp
);
5415 case BTRFS_IOC_SCRUB
:
5416 return btrfs_ioctl_scrub(file
, argp
);
5417 case BTRFS_IOC_SCRUB_CANCEL
:
5418 return btrfs_ioctl_scrub_cancel(root
, argp
);
5419 case BTRFS_IOC_SCRUB_PROGRESS
:
5420 return btrfs_ioctl_scrub_progress(root
, argp
);
5421 case BTRFS_IOC_BALANCE_V2
:
5422 return btrfs_ioctl_balance(file
, argp
);
5423 case BTRFS_IOC_BALANCE_CTL
:
5424 return btrfs_ioctl_balance_ctl(root
, arg
);
5425 case BTRFS_IOC_BALANCE_PROGRESS
:
5426 return btrfs_ioctl_balance_progress(root
, argp
);
5427 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
5428 return btrfs_ioctl_set_received_subvol(file
, argp
);
5430 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
5431 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
5433 case BTRFS_IOC_SEND
:
5434 return btrfs_ioctl_send(file
, argp
);
5435 case BTRFS_IOC_GET_DEV_STATS
:
5436 return btrfs_ioctl_get_dev_stats(root
, argp
);
5437 case BTRFS_IOC_QUOTA_CTL
:
5438 return btrfs_ioctl_quota_ctl(file
, argp
);
5439 case BTRFS_IOC_QGROUP_ASSIGN
:
5440 return btrfs_ioctl_qgroup_assign(file
, argp
);
5441 case BTRFS_IOC_QGROUP_CREATE
:
5442 return btrfs_ioctl_qgroup_create(file
, argp
);
5443 case BTRFS_IOC_QGROUP_LIMIT
:
5444 return btrfs_ioctl_qgroup_limit(file
, argp
);
5445 case BTRFS_IOC_QUOTA_RESCAN
:
5446 return btrfs_ioctl_quota_rescan(file
, argp
);
5447 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
5448 return btrfs_ioctl_quota_rescan_status(file
, argp
);
5449 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
5450 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
5451 case BTRFS_IOC_DEV_REPLACE
:
5452 return btrfs_ioctl_dev_replace(root
, argp
);
5453 case BTRFS_IOC_GET_FSLABEL
:
5454 return btrfs_ioctl_get_fslabel(file
, argp
);
5455 case BTRFS_IOC_SET_FSLABEL
:
5456 return btrfs_ioctl_set_fslabel(file
, argp
);
5457 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
5458 return btrfs_ioctl_get_supported_features(file
, argp
);
5459 case BTRFS_IOC_GET_FEATURES
:
5460 return btrfs_ioctl_get_features(file
, argp
);
5461 case BTRFS_IOC_SET_FEATURES
:
5462 return btrfs_ioctl_set_features(file
, argp
);