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/compat.h>
37 #include <linux/bit_spinlock.h>
38 #include <linux/security.h>
39 #include <linux/xattr.h>
40 #include <linux/vmalloc.h>
41 #include <linux/slab.h>
42 #include <linux/blkdev.h>
43 #include <linux/uuid.h>
44 #include <linux/btrfs.h>
45 #include <linux/uaccess.h>
48 #include "transaction.h"
49 #include "btrfs_inode.h"
50 #include "print-tree.h"
53 #include "inode-map.h"
55 #include "rcu-string.h"
57 #include "dev-replace.h"
62 #include "compression.h"
65 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
66 * structures are incorrect, as the timespec structure from userspace
67 * is 4 bytes too small. We define these alternatives here to teach
68 * the kernel about the 32-bit struct packing.
70 struct btrfs_ioctl_timespec_32
{
73 } __attribute__ ((__packed__
));
75 struct btrfs_ioctl_received_subvol_args_32
{
76 char uuid
[BTRFS_UUID_SIZE
]; /* in */
77 __u64 stransid
; /* in */
78 __u64 rtransid
; /* out */
79 struct btrfs_ioctl_timespec_32 stime
; /* in */
80 struct btrfs_ioctl_timespec_32 rtime
; /* out */
82 __u64 reserved
[16]; /* in */
83 } __attribute__ ((__packed__
));
85 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
86 struct btrfs_ioctl_received_subvol_args_32)
90 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
91 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
,
94 /* Mask out flags that are inappropriate for the given type of inode. */
95 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
99 else if (S_ISREG(mode
))
100 return flags
& ~FS_DIRSYNC_FL
;
102 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
106 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
108 static unsigned int btrfs_flags_to_ioctl(unsigned int flags
)
110 unsigned int iflags
= 0;
112 if (flags
& BTRFS_INODE_SYNC
)
113 iflags
|= FS_SYNC_FL
;
114 if (flags
& BTRFS_INODE_IMMUTABLE
)
115 iflags
|= FS_IMMUTABLE_FL
;
116 if (flags
& BTRFS_INODE_APPEND
)
117 iflags
|= FS_APPEND_FL
;
118 if (flags
& BTRFS_INODE_NODUMP
)
119 iflags
|= FS_NODUMP_FL
;
120 if (flags
& BTRFS_INODE_NOATIME
)
121 iflags
|= FS_NOATIME_FL
;
122 if (flags
& BTRFS_INODE_DIRSYNC
)
123 iflags
|= FS_DIRSYNC_FL
;
124 if (flags
& BTRFS_INODE_NODATACOW
)
125 iflags
|= FS_NOCOW_FL
;
127 if (flags
& BTRFS_INODE_NOCOMPRESS
)
128 iflags
|= FS_NOCOMP_FL
;
129 else if (flags
& BTRFS_INODE_COMPRESS
)
130 iflags
|= FS_COMPR_FL
;
136 * Update inode->i_flags based on the btrfs internal flags.
138 void btrfs_update_iflags(struct inode
*inode
)
140 struct btrfs_inode
*ip
= BTRFS_I(inode
);
141 unsigned int new_fl
= 0;
143 if (ip
->flags
& BTRFS_INODE_SYNC
)
145 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
146 new_fl
|= S_IMMUTABLE
;
147 if (ip
->flags
& BTRFS_INODE_APPEND
)
149 if (ip
->flags
& BTRFS_INODE_NOATIME
)
151 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
154 set_mask_bits(&inode
->i_flags
,
155 S_SYNC
| S_APPEND
| S_IMMUTABLE
| S_NOATIME
| S_DIRSYNC
,
160 * Inherit flags from the parent inode.
162 * Currently only the compression flags and the cow flags are inherited.
164 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
171 flags
= BTRFS_I(dir
)->flags
;
173 if (flags
& BTRFS_INODE_NOCOMPRESS
) {
174 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_COMPRESS
;
175 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
176 } else if (flags
& BTRFS_INODE_COMPRESS
) {
177 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
178 BTRFS_I(inode
)->flags
|= BTRFS_INODE_COMPRESS
;
181 if (flags
& BTRFS_INODE_NODATACOW
) {
182 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
;
183 if (S_ISREG(inode
->i_mode
))
184 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
187 btrfs_update_iflags(inode
);
190 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
192 struct btrfs_inode
*ip
= BTRFS_I(file_inode(file
));
193 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
195 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
200 static int check_flags(unsigned int flags
)
202 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
203 FS_NOATIME_FL
| FS_NODUMP_FL
| \
204 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
205 FS_NOCOMP_FL
| FS_COMPR_FL
|
209 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
215 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
217 struct inode
*inode
= file_inode(file
);
218 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
219 struct btrfs_inode
*ip
= BTRFS_I(inode
);
220 struct btrfs_root
*root
= ip
->root
;
221 struct btrfs_trans_handle
*trans
;
222 unsigned int flags
, oldflags
;
225 unsigned int i_oldflags
;
228 if (!inode_owner_or_capable(inode
))
231 if (btrfs_root_readonly(root
))
234 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
237 ret
= check_flags(flags
);
241 ret
= mnt_want_write_file(file
);
247 ip_oldflags
= ip
->flags
;
248 i_oldflags
= inode
->i_flags
;
249 mode
= inode
->i_mode
;
251 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
252 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
253 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
254 if (!capable(CAP_LINUX_IMMUTABLE
)) {
260 if (flags
& FS_SYNC_FL
)
261 ip
->flags
|= BTRFS_INODE_SYNC
;
263 ip
->flags
&= ~BTRFS_INODE_SYNC
;
264 if (flags
& FS_IMMUTABLE_FL
)
265 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
267 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
268 if (flags
& FS_APPEND_FL
)
269 ip
->flags
|= BTRFS_INODE_APPEND
;
271 ip
->flags
&= ~BTRFS_INODE_APPEND
;
272 if (flags
& FS_NODUMP_FL
)
273 ip
->flags
|= BTRFS_INODE_NODUMP
;
275 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
276 if (flags
& FS_NOATIME_FL
)
277 ip
->flags
|= BTRFS_INODE_NOATIME
;
279 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
280 if (flags
& FS_DIRSYNC_FL
)
281 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
283 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
284 if (flags
& FS_NOCOW_FL
) {
287 * It's safe to turn csums off here, no extents exist.
288 * Otherwise we want the flag to reflect the real COW
289 * status of the file and will not set it.
291 if (inode
->i_size
== 0)
292 ip
->flags
|= BTRFS_INODE_NODATACOW
293 | BTRFS_INODE_NODATASUM
;
295 ip
->flags
|= BTRFS_INODE_NODATACOW
;
299 * Revert back under same assumptions as above
302 if (inode
->i_size
== 0)
303 ip
->flags
&= ~(BTRFS_INODE_NODATACOW
304 | BTRFS_INODE_NODATASUM
);
306 ip
->flags
&= ~BTRFS_INODE_NODATACOW
;
311 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
312 * flag may be changed automatically if compression code won't make
315 if (flags
& FS_NOCOMP_FL
) {
316 ip
->flags
&= ~BTRFS_INODE_COMPRESS
;
317 ip
->flags
|= BTRFS_INODE_NOCOMPRESS
;
319 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
320 if (ret
&& ret
!= -ENODATA
)
322 } else if (flags
& FS_COMPR_FL
) {
325 ip
->flags
|= BTRFS_INODE_COMPRESS
;
326 ip
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
328 if (fs_info
->compress_type
== BTRFS_COMPRESS_LZO
)
332 ret
= btrfs_set_prop(inode
, "btrfs.compression",
333 comp
, strlen(comp
), 0);
338 ret
= btrfs_set_prop(inode
, "btrfs.compression", NULL
, 0, 0);
339 if (ret
&& ret
!= -ENODATA
)
341 ip
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
344 trans
= btrfs_start_transaction(root
, 1);
346 ret
= PTR_ERR(trans
);
350 btrfs_update_iflags(inode
);
351 inode_inc_iversion(inode
);
352 inode
->i_ctime
= current_time(inode
);
353 ret
= btrfs_update_inode(trans
, root
, inode
);
355 btrfs_end_transaction(trans
);
358 ip
->flags
= ip_oldflags
;
359 inode
->i_flags
= i_oldflags
;
364 mnt_drop_write_file(file
);
368 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
370 struct inode
*inode
= file_inode(file
);
372 return put_user(inode
->i_generation
, arg
);
375 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
377 struct inode
*inode
= file_inode(file
);
378 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
379 struct btrfs_device
*device
;
380 struct request_queue
*q
;
381 struct fstrim_range range
;
382 u64 minlen
= ULLONG_MAX
;
384 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
387 if (!capable(CAP_SYS_ADMIN
))
391 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
395 q
= bdev_get_queue(device
->bdev
);
396 if (blk_queue_discard(q
)) {
398 minlen
= min((u64
)q
->limits
.discard_granularity
,
406 if (copy_from_user(&range
, arg
, sizeof(range
)))
408 if (range
.start
> total_bytes
||
409 range
.len
< fs_info
->sb
->s_blocksize
)
412 range
.len
= min(range
.len
, total_bytes
- range
.start
);
413 range
.minlen
= max(range
.minlen
, minlen
);
414 ret
= btrfs_trim_fs(fs_info
, &range
);
418 if (copy_to_user(arg
, &range
, sizeof(range
)))
424 int btrfs_is_empty_uuid(u8
*uuid
)
428 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
435 static noinline
int create_subvol(struct inode
*dir
,
436 struct dentry
*dentry
,
437 char *name
, int namelen
,
439 struct btrfs_qgroup_inherit
*inherit
)
441 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
442 struct btrfs_trans_handle
*trans
;
443 struct btrfs_key key
;
444 struct btrfs_root_item
*root_item
;
445 struct btrfs_inode_item
*inode_item
;
446 struct extent_buffer
*leaf
;
447 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
448 struct btrfs_root
*new_root
;
449 struct btrfs_block_rsv block_rsv
;
450 struct timespec cur_time
= current_time(dir
);
455 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
460 root_item
= kzalloc(sizeof(*root_item
), GFP_KERNEL
);
464 ret
= btrfs_find_free_objectid(fs_info
->tree_root
, &objectid
);
469 * Don't create subvolume whose level is not zero. Or qgroup will be
470 * screwed up since it assumes subvolume qgroup's level to be 0.
472 if (btrfs_qgroup_level(objectid
)) {
477 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
479 * The same as the snapshot creation, please see the comment
480 * of create_snapshot().
482 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
483 8, &qgroup_reserved
, false);
487 trans
= btrfs_start_transaction(root
, 0);
489 ret
= PTR_ERR(trans
);
490 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
,
494 trans
->block_rsv
= &block_rsv
;
495 trans
->bytes_reserved
= block_rsv
.size
;
497 ret
= btrfs_qgroup_inherit(trans
, fs_info
, 0, objectid
, inherit
);
501 leaf
= btrfs_alloc_tree_block(trans
, root
, 0, objectid
, NULL
, 0, 0, 0);
507 memzero_extent_buffer(leaf
, 0, sizeof(struct btrfs_header
));
508 btrfs_set_header_bytenr(leaf
, leaf
->start
);
509 btrfs_set_header_generation(leaf
, trans
->transid
);
510 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
511 btrfs_set_header_owner(leaf
, objectid
);
513 write_extent_buffer_fsid(leaf
, fs_info
->fsid
);
514 write_extent_buffer_chunk_tree_uuid(leaf
, fs_info
->chunk_tree_uuid
);
515 btrfs_mark_buffer_dirty(leaf
);
517 inode_item
= &root_item
->inode
;
518 btrfs_set_stack_inode_generation(inode_item
, 1);
519 btrfs_set_stack_inode_size(inode_item
, 3);
520 btrfs_set_stack_inode_nlink(inode_item
, 1);
521 btrfs_set_stack_inode_nbytes(inode_item
,
523 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
525 btrfs_set_root_flags(root_item
, 0);
526 btrfs_set_root_limit(root_item
, 0);
527 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
529 btrfs_set_root_bytenr(root_item
, leaf
->start
);
530 btrfs_set_root_generation(root_item
, trans
->transid
);
531 btrfs_set_root_level(root_item
, 0);
532 btrfs_set_root_refs(root_item
, 1);
533 btrfs_set_root_used(root_item
, leaf
->len
);
534 btrfs_set_root_last_snapshot(root_item
, 0);
536 btrfs_set_root_generation_v2(root_item
,
537 btrfs_root_generation(root_item
));
538 uuid_le_gen(&new_uuid
);
539 memcpy(root_item
->uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
540 btrfs_set_stack_timespec_sec(&root_item
->otime
, cur_time
.tv_sec
);
541 btrfs_set_stack_timespec_nsec(&root_item
->otime
, cur_time
.tv_nsec
);
542 root_item
->ctime
= root_item
->otime
;
543 btrfs_set_root_ctransid(root_item
, trans
->transid
);
544 btrfs_set_root_otransid(root_item
, trans
->transid
);
546 btrfs_tree_unlock(leaf
);
547 free_extent_buffer(leaf
);
550 btrfs_set_root_dirid(root_item
, new_dirid
);
552 key
.objectid
= objectid
;
554 key
.type
= BTRFS_ROOT_ITEM_KEY
;
555 ret
= btrfs_insert_root(trans
, fs_info
->tree_root
, &key
,
560 key
.offset
= (u64
)-1;
561 new_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
562 if (IS_ERR(new_root
)) {
563 ret
= PTR_ERR(new_root
);
564 btrfs_abort_transaction(trans
, ret
);
568 btrfs_record_root_in_trans(trans
, new_root
);
570 ret
= btrfs_create_subvol_root(trans
, new_root
, root
, new_dirid
);
572 /* We potentially lose an unused inode item here */
573 btrfs_abort_transaction(trans
, ret
);
577 mutex_lock(&new_root
->objectid_mutex
);
578 new_root
->highest_objectid
= new_dirid
;
579 mutex_unlock(&new_root
->objectid_mutex
);
582 * insert the directory item
584 ret
= btrfs_set_inode_index(dir
, &index
);
586 btrfs_abort_transaction(trans
, ret
);
590 ret
= btrfs_insert_dir_item(trans
, root
,
591 name
, namelen
, dir
, &key
,
592 BTRFS_FT_DIR
, index
);
594 btrfs_abort_transaction(trans
, ret
);
598 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
599 ret
= btrfs_update_inode(trans
, root
, dir
);
602 ret
= btrfs_add_root_ref(trans
, fs_info
,
603 objectid
, root
->root_key
.objectid
,
604 btrfs_ino(dir
), index
, name
, namelen
);
607 ret
= btrfs_uuid_tree_add(trans
, fs_info
, root_item
->uuid
,
608 BTRFS_UUID_KEY_SUBVOL
, objectid
);
610 btrfs_abort_transaction(trans
, ret
);
614 trans
->block_rsv
= NULL
;
615 trans
->bytes_reserved
= 0;
616 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
, qgroup_reserved
);
619 *async_transid
= trans
->transid
;
620 err
= btrfs_commit_transaction_async(trans
, 1);
622 err
= btrfs_commit_transaction(trans
);
624 err
= btrfs_commit_transaction(trans
);
630 inode
= btrfs_lookup_dentry(dir
, dentry
);
632 return PTR_ERR(inode
);
633 d_instantiate(dentry
, inode
);
642 static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root
*root
)
648 prepare_to_wait(&root
->subv_writers
->wait
, &wait
,
649 TASK_UNINTERRUPTIBLE
);
651 writers
= percpu_counter_sum(&root
->subv_writers
->counter
);
655 finish_wait(&root
->subv_writers
->wait
, &wait
);
659 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
660 struct dentry
*dentry
, char *name
, int namelen
,
661 u64
*async_transid
, bool readonly
,
662 struct btrfs_qgroup_inherit
*inherit
)
664 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
666 struct btrfs_pending_snapshot
*pending_snapshot
;
667 struct btrfs_trans_handle
*trans
;
670 if (!test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
673 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
674 if (!pending_snapshot
)
677 pending_snapshot
->root_item
= kzalloc(sizeof(struct btrfs_root_item
),
679 pending_snapshot
->path
= btrfs_alloc_path();
680 if (!pending_snapshot
->root_item
|| !pending_snapshot
->path
) {
685 atomic_inc(&root
->will_be_snapshoted
);
686 smp_mb__after_atomic();
687 btrfs_wait_for_no_snapshoting_writes(root
);
689 ret
= btrfs_start_delalloc_inodes(root
, 0);
693 btrfs_wait_ordered_extents(root
, -1, 0, (u64
)-1);
695 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
696 BTRFS_BLOCK_RSV_TEMP
);
698 * 1 - parent dir inode
701 * 2 - root ref/backref
702 * 1 - root of snapshot
705 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
706 &pending_snapshot
->block_rsv
, 8,
707 &pending_snapshot
->qgroup_reserved
,
712 pending_snapshot
->dentry
= dentry
;
713 pending_snapshot
->root
= root
;
714 pending_snapshot
->readonly
= readonly
;
715 pending_snapshot
->dir
= dir
;
716 pending_snapshot
->inherit
= inherit
;
718 trans
= btrfs_start_transaction(root
, 0);
720 ret
= PTR_ERR(trans
);
724 spin_lock(&fs_info
->trans_lock
);
725 list_add(&pending_snapshot
->list
,
726 &trans
->transaction
->pending_snapshots
);
727 spin_unlock(&fs_info
->trans_lock
);
729 *async_transid
= trans
->transid
;
730 ret
= btrfs_commit_transaction_async(trans
, 1);
732 ret
= btrfs_commit_transaction(trans
);
734 ret
= btrfs_commit_transaction(trans
);
739 ret
= pending_snapshot
->error
;
743 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
747 inode
= btrfs_lookup_dentry(d_inode(dentry
->d_parent
), dentry
);
749 ret
= PTR_ERR(inode
);
753 d_instantiate(dentry
, inode
);
756 btrfs_subvolume_release_metadata(fs_info
,
757 &pending_snapshot
->block_rsv
,
758 pending_snapshot
->qgroup_reserved
);
760 if (atomic_dec_and_test(&root
->will_be_snapshoted
))
761 wake_up_atomic_t(&root
->will_be_snapshoted
);
763 kfree(pending_snapshot
->root_item
);
764 btrfs_free_path(pending_snapshot
->path
);
765 kfree(pending_snapshot
);
770 /* copy of may_delete in fs/namei.c()
771 * Check whether we can remove a link victim from directory dir, check
772 * whether the type of victim is right.
773 * 1. We can't do it if dir is read-only (done in permission())
774 * 2. We should have write and exec permissions on dir
775 * 3. We can't remove anything from append-only dir
776 * 4. We can't do anything with immutable dir (done in permission())
777 * 5. If the sticky bit on dir is set we should either
778 * a. be owner of dir, or
779 * b. be owner of victim, or
780 * c. have CAP_FOWNER capability
781 * 6. If the victim is append-only or immutable we can't do anything with
782 * links pointing to it.
783 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
784 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
785 * 9. We can't remove a root or mountpoint.
786 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
787 * nfs_async_unlink().
790 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
794 if (d_really_is_negative(victim
))
797 BUG_ON(d_inode(victim
->d_parent
) != dir
);
798 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
800 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
805 if (check_sticky(dir
, d_inode(victim
)) || IS_APPEND(d_inode(victim
)) ||
806 IS_IMMUTABLE(d_inode(victim
)) || IS_SWAPFILE(d_inode(victim
)))
809 if (!d_is_dir(victim
))
813 } else if (d_is_dir(victim
))
817 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
822 /* copy of may_create in fs/namei.c() */
823 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
825 if (d_really_is_positive(child
))
829 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
833 * Create a new subvolume below @parent. This is largely modeled after
834 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
835 * inside this filesystem so it's quite a bit simpler.
837 static noinline
int btrfs_mksubvol(const struct path
*parent
,
838 char *name
, int namelen
,
839 struct btrfs_root
*snap_src
,
840 u64
*async_transid
, bool readonly
,
841 struct btrfs_qgroup_inherit
*inherit
)
843 struct inode
*dir
= d_inode(parent
->dentry
);
844 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
845 struct dentry
*dentry
;
848 error
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
852 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
853 error
= PTR_ERR(dentry
);
857 error
= btrfs_may_create(dir
, dentry
);
862 * even if this name doesn't exist, we may get hash collisions.
863 * check for them now when we can safely fail
865 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
871 down_read(&fs_info
->subvol_sem
);
873 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
877 error
= create_snapshot(snap_src
, dir
, dentry
, name
, namelen
,
878 async_transid
, readonly
, inherit
);
880 error
= create_subvol(dir
, dentry
, name
, namelen
,
881 async_transid
, inherit
);
884 fsnotify_mkdir(dir
, dentry
);
886 up_read(&fs_info
->subvol_sem
);
895 * When we're defragging a range, we don't want to kick it off again
896 * if it is really just waiting for delalloc to send it down.
897 * If we find a nice big extent or delalloc range for the bytes in the
898 * file you want to defrag, we return 0 to let you know to skip this
901 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, u32 thresh
)
903 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
904 struct extent_map
*em
= NULL
;
905 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
908 read_lock(&em_tree
->lock
);
909 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_SIZE
);
910 read_unlock(&em_tree
->lock
);
913 end
= extent_map_end(em
);
915 if (end
- offset
> thresh
)
918 /* if we already have a nice delalloc here, just stop */
920 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
921 thresh
, EXTENT_DELALLOC
, 1);
928 * helper function to walk through a file and find extents
929 * newer than a specific transid, and smaller than thresh.
931 * This is used by the defragging code to find new and small
934 static int find_new_extents(struct btrfs_root
*root
,
935 struct inode
*inode
, u64 newer_than
,
936 u64
*off
, u32 thresh
)
938 struct btrfs_path
*path
;
939 struct btrfs_key min_key
;
940 struct extent_buffer
*leaf
;
941 struct btrfs_file_extent_item
*extent
;
944 u64 ino
= btrfs_ino(inode
);
946 path
= btrfs_alloc_path();
950 min_key
.objectid
= ino
;
951 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
952 min_key
.offset
= *off
;
955 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
959 if (min_key
.objectid
!= ino
)
961 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
964 leaf
= path
->nodes
[0];
965 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
966 struct btrfs_file_extent_item
);
968 type
= btrfs_file_extent_type(leaf
, extent
);
969 if (type
== BTRFS_FILE_EXTENT_REG
&&
970 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
971 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
972 *off
= min_key
.offset
;
973 btrfs_free_path(path
);
978 if (path
->slots
[0] < btrfs_header_nritems(leaf
)) {
979 btrfs_item_key_to_cpu(leaf
, &min_key
, path
->slots
[0]);
983 if (min_key
.offset
== (u64
)-1)
987 btrfs_release_path(path
);
990 btrfs_free_path(path
);
994 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
996 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
997 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
998 struct extent_map
*em
;
1002 * hopefully we have this extent in the tree already, try without
1003 * the full extent lock
1005 read_lock(&em_tree
->lock
);
1006 em
= lookup_extent_mapping(em_tree
, start
, len
);
1007 read_unlock(&em_tree
->lock
);
1010 struct extent_state
*cached
= NULL
;
1011 u64 end
= start
+ len
- 1;
1013 /* get the big lock and read metadata off disk */
1014 lock_extent_bits(io_tree
, start
, end
, &cached
);
1015 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
1016 unlock_extent_cached(io_tree
, start
, end
, &cached
, GFP_NOFS
);
1025 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
1027 struct extent_map
*next
;
1030 /* this is the last extent */
1031 if (em
->start
+ em
->len
>= i_size_read(inode
))
1034 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
1035 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
1037 else if ((em
->block_start
+ em
->block_len
== next
->block_start
) &&
1038 (em
->block_len
> SZ_128K
&& next
->block_len
> SZ_128K
))
1041 free_extent_map(next
);
1045 static int should_defrag_range(struct inode
*inode
, u64 start
, u32 thresh
,
1046 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
1049 struct extent_map
*em
;
1051 bool next_mergeable
= true;
1052 bool prev_mergeable
= true;
1055 * make sure that once we start defragging an extent, we keep on
1058 if (start
< *defrag_end
)
1063 em
= defrag_lookup_extent(inode
, start
);
1067 /* this will cover holes, and inline extents */
1068 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
1074 prev_mergeable
= false;
1076 next_mergeable
= defrag_check_next_extent(inode
, em
);
1078 * we hit a real extent, if it is big or the next extent is not a
1079 * real extent, don't bother defragging it
1081 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
1082 (em
->len
>= thresh
|| (!next_mergeable
&& !prev_mergeable
)))
1086 * last_len ends up being a counter of how many bytes we've defragged.
1087 * every time we choose not to defrag an extent, we reset *last_len
1088 * so that the next tiny extent will force a defrag.
1090 * The end result of this is that tiny extents before a single big
1091 * extent will force at least part of that big extent to be defragged.
1094 *defrag_end
= extent_map_end(em
);
1097 *skip
= extent_map_end(em
);
1101 free_extent_map(em
);
1106 * it doesn't do much good to defrag one or two pages
1107 * at a time. This pulls in a nice chunk of pages
1108 * to COW and defrag.
1110 * It also makes sure the delalloc code has enough
1111 * dirty data to avoid making new small extents as part
1114 * It's a good idea to start RA on this range
1115 * before calling this.
1117 static int cluster_pages_for_defrag(struct inode
*inode
,
1118 struct page
**pages
,
1119 unsigned long start_index
,
1120 unsigned long num_pages
)
1122 unsigned long file_end
;
1123 u64 isize
= i_size_read(inode
);
1130 struct btrfs_ordered_extent
*ordered
;
1131 struct extent_state
*cached_state
= NULL
;
1132 struct extent_io_tree
*tree
;
1133 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1135 file_end
= (isize
- 1) >> PAGE_SHIFT
;
1136 if (!isize
|| start_index
> file_end
)
1139 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1141 ret
= btrfs_delalloc_reserve_space(inode
,
1142 start_index
<< PAGE_SHIFT
,
1143 page_cnt
<< PAGE_SHIFT
);
1147 tree
= &BTRFS_I(inode
)->io_tree
;
1149 /* step one, lock all the pages */
1150 for (i
= 0; i
< page_cnt
; i
++) {
1153 page
= find_or_create_page(inode
->i_mapping
,
1154 start_index
+ i
, mask
);
1158 page_start
= page_offset(page
);
1159 page_end
= page_start
+ PAGE_SIZE
- 1;
1161 lock_extent_bits(tree
, page_start
, page_end
,
1163 ordered
= btrfs_lookup_ordered_extent(inode
,
1165 unlock_extent_cached(tree
, page_start
, page_end
,
1166 &cached_state
, GFP_NOFS
);
1171 btrfs_start_ordered_extent(inode
, ordered
, 1);
1172 btrfs_put_ordered_extent(ordered
);
1175 * we unlocked the page above, so we need check if
1176 * it was released or not.
1178 if (page
->mapping
!= inode
->i_mapping
) {
1185 if (!PageUptodate(page
)) {
1186 btrfs_readpage(NULL
, page
);
1188 if (!PageUptodate(page
)) {
1196 if (page
->mapping
!= inode
->i_mapping
) {
1208 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1212 * so now we have a nice long stream of locked
1213 * and up to date pages, lets wait on them
1215 for (i
= 0; i
< i_done
; i
++)
1216 wait_on_page_writeback(pages
[i
]);
1218 page_start
= page_offset(pages
[0]);
1219 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_SIZE
;
1221 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1222 page_start
, page_end
- 1, &cached_state
);
1223 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1224 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1225 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1226 &cached_state
, GFP_NOFS
);
1228 if (i_done
!= page_cnt
) {
1229 spin_lock(&BTRFS_I(inode
)->lock
);
1230 BTRFS_I(inode
)->outstanding_extents
++;
1231 spin_unlock(&BTRFS_I(inode
)->lock
);
1232 btrfs_delalloc_release_space(inode
,
1233 start_index
<< PAGE_SHIFT
,
1234 (page_cnt
- i_done
) << PAGE_SHIFT
);
1238 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1241 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1242 page_start
, page_end
- 1, &cached_state
,
1245 for (i
= 0; i
< i_done
; i
++) {
1246 clear_page_dirty_for_io(pages
[i
]);
1247 ClearPageChecked(pages
[i
]);
1248 set_page_extent_mapped(pages
[i
]);
1249 set_page_dirty(pages
[i
]);
1250 unlock_page(pages
[i
]);
1255 for (i
= 0; i
< i_done
; i
++) {
1256 unlock_page(pages
[i
]);
1259 btrfs_delalloc_release_space(inode
,
1260 start_index
<< PAGE_SHIFT
,
1261 page_cnt
<< PAGE_SHIFT
);
1266 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1267 struct btrfs_ioctl_defrag_range_args
*range
,
1268 u64 newer_than
, unsigned long max_to_defrag
)
1270 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1271 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1272 struct file_ra_state
*ra
= NULL
;
1273 unsigned long last_index
;
1274 u64 isize
= i_size_read(inode
);
1278 u64 newer_off
= range
->start
;
1280 unsigned long ra_index
= 0;
1282 int defrag_count
= 0;
1283 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1284 u32 extent_thresh
= range
->extent_thresh
;
1285 unsigned long max_cluster
= SZ_256K
>> PAGE_SHIFT
;
1286 unsigned long cluster
= max_cluster
;
1287 u64 new_align
= ~((u64
)SZ_128K
- 1);
1288 struct page
**pages
= NULL
;
1293 if (range
->start
>= isize
)
1296 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1297 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1299 if (range
->compress_type
)
1300 compress_type
= range
->compress_type
;
1303 if (extent_thresh
== 0)
1304 extent_thresh
= SZ_256K
;
1307 * if we were not given a file, allocate a readahead
1311 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
1314 file_ra_state_init(ra
, inode
->i_mapping
);
1319 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*),
1326 /* find the last page to defrag */
1327 if (range
->start
+ range
->len
> range
->start
) {
1328 last_index
= min_t(u64
, isize
- 1,
1329 range
->start
+ range
->len
- 1) >> PAGE_SHIFT
;
1331 last_index
= (isize
- 1) >> PAGE_SHIFT
;
1335 ret
= find_new_extents(root
, inode
, newer_than
,
1336 &newer_off
, SZ_64K
);
1338 range
->start
= newer_off
;
1340 * we always align our defrag to help keep
1341 * the extents in the file evenly spaced
1343 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1347 i
= range
->start
>> PAGE_SHIFT
;
1350 max_to_defrag
= last_index
- i
+ 1;
1353 * make writeback starts from i, so the defrag range can be
1354 * written sequentially.
1356 if (i
< inode
->i_mapping
->writeback_index
)
1357 inode
->i_mapping
->writeback_index
= i
;
1359 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1360 (i
< DIV_ROUND_UP(i_size_read(inode
), PAGE_SIZE
))) {
1362 * make sure we stop running if someone unmounts
1365 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1368 if (btrfs_defrag_cancelled(fs_info
)) {
1369 btrfs_debug(fs_info
, "defrag_file cancelled");
1374 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_SHIFT
,
1375 extent_thresh
, &last_len
, &skip
,
1376 &defrag_end
, range
->flags
&
1377 BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1380 * the should_defrag function tells us how much to skip
1381 * bump our counter by the suggested amount
1383 next
= DIV_ROUND_UP(skip
, PAGE_SIZE
);
1384 i
= max(i
+ 1, next
);
1389 cluster
= (PAGE_ALIGN(defrag_end
) >>
1391 cluster
= min(cluster
, max_cluster
);
1393 cluster
= max_cluster
;
1396 if (i
+ cluster
> ra_index
) {
1397 ra_index
= max(i
, ra_index
);
1398 btrfs_force_ra(inode
->i_mapping
, ra
, file
, ra_index
,
1400 ra_index
+= cluster
;
1404 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
1405 BTRFS_I(inode
)->force_compress
= compress_type
;
1406 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1408 inode_unlock(inode
);
1412 defrag_count
+= ret
;
1413 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1414 inode_unlock(inode
);
1417 if (newer_off
== (u64
)-1)
1423 newer_off
= max(newer_off
+ 1,
1424 (u64
)i
<< PAGE_SHIFT
);
1426 ret
= find_new_extents(root
, inode
, newer_than
,
1427 &newer_off
, SZ_64K
);
1429 range
->start
= newer_off
;
1430 i
= (newer_off
& new_align
) >> PAGE_SHIFT
;
1437 last_len
+= ret
<< PAGE_SHIFT
;
1445 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
)) {
1446 filemap_flush(inode
->i_mapping
);
1447 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1448 &BTRFS_I(inode
)->runtime_flags
))
1449 filemap_flush(inode
->i_mapping
);
1452 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1453 /* the filemap_flush will queue IO into the worker threads, but
1454 * we have to make sure the IO is actually started and that
1455 * ordered extents get created before we return
1457 atomic_inc(&fs_info
->async_submit_draining
);
1458 while (atomic_read(&fs_info
->nr_async_submits
) ||
1459 atomic_read(&fs_info
->async_delalloc_pages
)) {
1460 wait_event(fs_info
->async_submit_wait
,
1461 (atomic_read(&fs_info
->nr_async_submits
) == 0 &&
1462 atomic_read(&fs_info
->async_delalloc_pages
) == 0));
1464 atomic_dec(&fs_info
->async_submit_draining
);
1467 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1468 btrfs_set_fs_incompat(fs_info
, COMPRESS_LZO
);
1474 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1476 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
1477 inode_unlock(inode
);
1485 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1488 struct inode
*inode
= file_inode(file
);
1489 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1493 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1494 struct btrfs_ioctl_vol_args
*vol_args
;
1495 struct btrfs_trans_handle
*trans
;
1496 struct btrfs_device
*device
= NULL
;
1499 char *devstr
= NULL
;
1503 if (!capable(CAP_SYS_ADMIN
))
1506 ret
= mnt_want_write_file(file
);
1510 if (atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
1511 mnt_drop_write_file(file
);
1512 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1515 mutex_lock(&fs_info
->volume_mutex
);
1516 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1517 if (IS_ERR(vol_args
)) {
1518 ret
= PTR_ERR(vol_args
);
1522 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1524 sizestr
= vol_args
->name
;
1525 devstr
= strchr(sizestr
, ':');
1527 sizestr
= devstr
+ 1;
1529 devstr
= vol_args
->name
;
1530 ret
= kstrtoull(devstr
, 10, &devid
);
1537 btrfs_info(fs_info
, "resizing devid %llu", devid
);
1540 device
= btrfs_find_device(fs_info
, devid
, NULL
, NULL
);
1542 btrfs_info(fs_info
, "resizer unable to find device %llu",
1548 if (!device
->writeable
) {
1550 "resizer unable to apply on readonly device %llu",
1556 if (!strcmp(sizestr
, "max"))
1557 new_size
= device
->bdev
->bd_inode
->i_size
;
1559 if (sizestr
[0] == '-') {
1562 } else if (sizestr
[0] == '+') {
1566 new_size
= memparse(sizestr
, &retptr
);
1567 if (*retptr
!= '\0' || new_size
== 0) {
1573 if (device
->is_tgtdev_for_dev_replace
) {
1578 old_size
= btrfs_device_get_total_bytes(device
);
1581 if (new_size
> old_size
) {
1585 new_size
= old_size
- new_size
;
1586 } else if (mod
> 0) {
1587 if (new_size
> ULLONG_MAX
- old_size
) {
1591 new_size
= old_size
+ new_size
;
1594 if (new_size
< SZ_256M
) {
1598 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1603 new_size
= div_u64(new_size
, fs_info
->sectorsize
);
1604 new_size
*= fs_info
->sectorsize
;
1606 btrfs_info_in_rcu(fs_info
, "new size for %s is %llu",
1607 rcu_str_deref(device
->name
), new_size
);
1609 if (new_size
> old_size
) {
1610 trans
= btrfs_start_transaction(root
, 0);
1611 if (IS_ERR(trans
)) {
1612 ret
= PTR_ERR(trans
);
1615 ret
= btrfs_grow_device(trans
, device
, new_size
);
1616 btrfs_commit_transaction(trans
);
1617 } else if (new_size
< old_size
) {
1618 ret
= btrfs_shrink_device(device
, new_size
);
1619 } /* equal, nothing need to do */
1624 mutex_unlock(&fs_info
->volume_mutex
);
1625 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
1626 mnt_drop_write_file(file
);
1630 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1631 char *name
, unsigned long fd
, int subvol
,
1632 u64
*transid
, bool readonly
,
1633 struct btrfs_qgroup_inherit
*inherit
)
1638 if (!S_ISDIR(file_inode(file
)->i_mode
))
1641 ret
= mnt_want_write_file(file
);
1645 namelen
= strlen(name
);
1646 if (strchr(name
, '/')) {
1648 goto out_drop_write
;
1651 if (name
[0] == '.' &&
1652 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1654 goto out_drop_write
;
1658 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1659 NULL
, transid
, readonly
, inherit
);
1661 struct fd src
= fdget(fd
);
1662 struct inode
*src_inode
;
1665 goto out_drop_write
;
1668 src_inode
= file_inode(src
.file
);
1669 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1670 btrfs_info(BTRFS_I(file_inode(file
))->root
->fs_info
,
1671 "Snapshot src from another FS");
1673 } else if (!inode_owner_or_capable(src_inode
)) {
1675 * Subvolume creation is not restricted, but snapshots
1676 * are limited to own subvolumes only
1680 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1681 BTRFS_I(src_inode
)->root
,
1682 transid
, readonly
, inherit
);
1687 mnt_drop_write_file(file
);
1692 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1693 void __user
*arg
, int subvol
)
1695 struct btrfs_ioctl_vol_args
*vol_args
;
1698 if (!S_ISDIR(file_inode(file
)->i_mode
))
1701 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1702 if (IS_ERR(vol_args
))
1703 return PTR_ERR(vol_args
);
1704 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1706 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1707 vol_args
->fd
, subvol
,
1714 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1715 void __user
*arg
, int subvol
)
1717 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1721 bool readonly
= false;
1722 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1724 if (!S_ISDIR(file_inode(file
)->i_mode
))
1727 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1728 if (IS_ERR(vol_args
))
1729 return PTR_ERR(vol_args
);
1730 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1732 if (vol_args
->flags
&
1733 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1734 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1739 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1741 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1743 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1744 if (vol_args
->size
> PAGE_SIZE
) {
1748 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1749 if (IS_ERR(inherit
)) {
1750 ret
= PTR_ERR(inherit
);
1755 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1756 vol_args
->fd
, subvol
, ptr
,
1761 if (ptr
&& copy_to_user(arg
+
1762 offsetof(struct btrfs_ioctl_vol_args_v2
,
1774 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1777 struct inode
*inode
= file_inode(file
);
1778 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1779 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1783 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
)
1786 down_read(&fs_info
->subvol_sem
);
1787 if (btrfs_root_readonly(root
))
1788 flags
|= BTRFS_SUBVOL_RDONLY
;
1789 up_read(&fs_info
->subvol_sem
);
1791 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1797 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1800 struct inode
*inode
= file_inode(file
);
1801 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1802 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1803 struct btrfs_trans_handle
*trans
;
1808 if (!inode_owner_or_capable(inode
))
1811 ret
= mnt_want_write_file(file
);
1815 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
1817 goto out_drop_write
;
1820 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1822 goto out_drop_write
;
1825 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1827 goto out_drop_write
;
1830 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1832 goto out_drop_write
;
1835 down_write(&fs_info
->subvol_sem
);
1838 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1841 root_flags
= btrfs_root_flags(&root
->root_item
);
1842 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1843 btrfs_set_root_flags(&root
->root_item
,
1844 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1847 * Block RO -> RW transition if this subvolume is involved in
1850 spin_lock(&root
->root_item_lock
);
1851 if (root
->send_in_progress
== 0) {
1852 btrfs_set_root_flags(&root
->root_item
,
1853 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1854 spin_unlock(&root
->root_item_lock
);
1856 spin_unlock(&root
->root_item_lock
);
1858 "Attempt to set subvolume %llu read-write during send",
1859 root
->root_key
.objectid
);
1865 trans
= btrfs_start_transaction(root
, 1);
1866 if (IS_ERR(trans
)) {
1867 ret
= PTR_ERR(trans
);
1871 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
1872 &root
->root_key
, &root
->root_item
);
1874 btrfs_commit_transaction(trans
);
1877 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1879 up_write(&fs_info
->subvol_sem
);
1881 mnt_drop_write_file(file
);
1887 * helper to check if the subvolume references other subvolumes
1889 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1891 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1892 struct btrfs_path
*path
;
1893 struct btrfs_dir_item
*di
;
1894 struct btrfs_key key
;
1898 path
= btrfs_alloc_path();
1902 /* Make sure this root isn't set as the default subvol */
1903 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
1904 di
= btrfs_lookup_dir_item(NULL
, fs_info
->tree_root
, path
,
1905 dir_id
, "default", 7, 0);
1906 if (di
&& !IS_ERR(di
)) {
1907 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
1908 if (key
.objectid
== root
->root_key
.objectid
) {
1911 "deleting default subvolume %llu is not allowed",
1915 btrfs_release_path(path
);
1918 key
.objectid
= root
->root_key
.objectid
;
1919 key
.type
= BTRFS_ROOT_REF_KEY
;
1920 key
.offset
= (u64
)-1;
1922 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
1928 if (path
->slots
[0] > 0) {
1930 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1931 if (key
.objectid
== root
->root_key
.objectid
&&
1932 key
.type
== BTRFS_ROOT_REF_KEY
)
1936 btrfs_free_path(path
);
1940 static noinline
int key_in_sk(struct btrfs_key
*key
,
1941 struct btrfs_ioctl_search_key
*sk
)
1943 struct btrfs_key test
;
1946 test
.objectid
= sk
->min_objectid
;
1947 test
.type
= sk
->min_type
;
1948 test
.offset
= sk
->min_offset
;
1950 ret
= btrfs_comp_cpu_keys(key
, &test
);
1954 test
.objectid
= sk
->max_objectid
;
1955 test
.type
= sk
->max_type
;
1956 test
.offset
= sk
->max_offset
;
1958 ret
= btrfs_comp_cpu_keys(key
, &test
);
1964 static noinline
int copy_to_sk(struct btrfs_path
*path
,
1965 struct btrfs_key
*key
,
1966 struct btrfs_ioctl_search_key
*sk
,
1969 unsigned long *sk_offset
,
1973 struct extent_buffer
*leaf
;
1974 struct btrfs_ioctl_search_header sh
;
1975 struct btrfs_key test
;
1976 unsigned long item_off
;
1977 unsigned long item_len
;
1983 leaf
= path
->nodes
[0];
1984 slot
= path
->slots
[0];
1985 nritems
= btrfs_header_nritems(leaf
);
1987 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1991 found_transid
= btrfs_header_generation(leaf
);
1993 for (i
= slot
; i
< nritems
; i
++) {
1994 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1995 item_len
= btrfs_item_size_nr(leaf
, i
);
1997 btrfs_item_key_to_cpu(leaf
, key
, i
);
1998 if (!key_in_sk(key
, sk
))
2001 if (sizeof(sh
) + item_len
> *buf_size
) {
2008 * return one empty item back for v1, which does not
2012 *buf_size
= sizeof(sh
) + item_len
;
2017 if (sizeof(sh
) + item_len
+ *sk_offset
> *buf_size
) {
2022 sh
.objectid
= key
->objectid
;
2023 sh
.offset
= key
->offset
;
2024 sh
.type
= key
->type
;
2026 sh
.transid
= found_transid
;
2028 /* copy search result header */
2029 if (copy_to_user(ubuf
+ *sk_offset
, &sh
, sizeof(sh
))) {
2034 *sk_offset
+= sizeof(sh
);
2037 char __user
*up
= ubuf
+ *sk_offset
;
2039 if (read_extent_buffer_to_user(leaf
, up
,
2040 item_off
, item_len
)) {
2045 *sk_offset
+= item_len
;
2049 if (ret
) /* -EOVERFLOW from above */
2052 if (*num_found
>= sk
->nr_items
) {
2059 test
.objectid
= sk
->max_objectid
;
2060 test
.type
= sk
->max_type
;
2061 test
.offset
= sk
->max_offset
;
2062 if (btrfs_comp_cpu_keys(key
, &test
) >= 0)
2064 else if (key
->offset
< (u64
)-1)
2066 else if (key
->type
< (u8
)-1) {
2069 } else if (key
->objectid
< (u64
)-1) {
2077 * 0: all items from this leaf copied, continue with next
2078 * 1: * more items can be copied, but unused buffer is too small
2079 * * all items were found
2080 * Either way, it will stops the loop which iterates to the next
2082 * -EOVERFLOW: item was to large for buffer
2083 * -EFAULT: could not copy extent buffer back to userspace
2088 static noinline
int search_ioctl(struct inode
*inode
,
2089 struct btrfs_ioctl_search_key
*sk
,
2093 struct btrfs_fs_info
*info
= btrfs_sb(inode
->i_sb
);
2094 struct btrfs_root
*root
;
2095 struct btrfs_key key
;
2096 struct btrfs_path
*path
;
2099 unsigned long sk_offset
= 0;
2101 if (*buf_size
< sizeof(struct btrfs_ioctl_search_header
)) {
2102 *buf_size
= sizeof(struct btrfs_ioctl_search_header
);
2106 path
= btrfs_alloc_path();
2110 if (sk
->tree_id
== 0) {
2111 /* search the root of the inode that was passed */
2112 root
= BTRFS_I(inode
)->root
;
2114 key
.objectid
= sk
->tree_id
;
2115 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2116 key
.offset
= (u64
)-1;
2117 root
= btrfs_read_fs_root_no_name(info
, &key
);
2119 btrfs_free_path(path
);
2124 key
.objectid
= sk
->min_objectid
;
2125 key
.type
= sk
->min_type
;
2126 key
.offset
= sk
->min_offset
;
2129 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
2135 ret
= copy_to_sk(path
, &key
, sk
, buf_size
, ubuf
,
2136 &sk_offset
, &num_found
);
2137 btrfs_release_path(path
);
2145 sk
->nr_items
= num_found
;
2146 btrfs_free_path(path
);
2150 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
2153 struct btrfs_ioctl_search_args __user
*uargs
;
2154 struct btrfs_ioctl_search_key sk
;
2155 struct inode
*inode
;
2159 if (!capable(CAP_SYS_ADMIN
))
2162 uargs
= (struct btrfs_ioctl_search_args __user
*)argp
;
2164 if (copy_from_user(&sk
, &uargs
->key
, sizeof(sk
)))
2167 buf_size
= sizeof(uargs
->buf
);
2169 inode
= file_inode(file
);
2170 ret
= search_ioctl(inode
, &sk
, &buf_size
, uargs
->buf
);
2173 * In the origin implementation an overflow is handled by returning a
2174 * search header with a len of zero, so reset ret.
2176 if (ret
== -EOVERFLOW
)
2179 if (ret
== 0 && copy_to_user(&uargs
->key
, &sk
, sizeof(sk
)))
2184 static noinline
int btrfs_ioctl_tree_search_v2(struct file
*file
,
2187 struct btrfs_ioctl_search_args_v2 __user
*uarg
;
2188 struct btrfs_ioctl_search_args_v2 args
;
2189 struct inode
*inode
;
2192 const size_t buf_limit
= SZ_16M
;
2194 if (!capable(CAP_SYS_ADMIN
))
2197 /* copy search header and buffer size */
2198 uarg
= (struct btrfs_ioctl_search_args_v2 __user
*)argp
;
2199 if (copy_from_user(&args
, uarg
, sizeof(args
)))
2202 buf_size
= args
.buf_size
;
2204 if (buf_size
< sizeof(struct btrfs_ioctl_search_header
))
2207 /* limit result size to 16MB */
2208 if (buf_size
> buf_limit
)
2209 buf_size
= buf_limit
;
2211 inode
= file_inode(file
);
2212 ret
= search_ioctl(inode
, &args
.key
, &buf_size
,
2213 (char *)(&uarg
->buf
[0]));
2214 if (ret
== 0 && copy_to_user(&uarg
->key
, &args
.key
, sizeof(args
.key
)))
2216 else if (ret
== -EOVERFLOW
&&
2217 copy_to_user(&uarg
->buf_size
, &buf_size
, sizeof(buf_size
)))
2224 * Search INODE_REFs to identify path name of 'dirid' directory
2225 * in a 'tree_id' tree. and sets path name to 'name'.
2227 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
2228 u64 tree_id
, u64 dirid
, char *name
)
2230 struct btrfs_root
*root
;
2231 struct btrfs_key key
;
2237 struct btrfs_inode_ref
*iref
;
2238 struct extent_buffer
*l
;
2239 struct btrfs_path
*path
;
2241 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2246 path
= btrfs_alloc_path();
2250 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
2252 key
.objectid
= tree_id
;
2253 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2254 key
.offset
= (u64
)-1;
2255 root
= btrfs_read_fs_root_no_name(info
, &key
);
2257 btrfs_err(info
, "could not find root %llu", tree_id
);
2262 key
.objectid
= dirid
;
2263 key
.type
= BTRFS_INODE_REF_KEY
;
2264 key
.offset
= (u64
)-1;
2267 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2271 ret
= btrfs_previous_item(root
, path
, dirid
,
2272 BTRFS_INODE_REF_KEY
);
2282 slot
= path
->slots
[0];
2283 btrfs_item_key_to_cpu(l
, &key
, slot
);
2285 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2286 len
= btrfs_inode_ref_name_len(l
, iref
);
2288 total_len
+= len
+ 1;
2290 ret
= -ENAMETOOLONG
;
2295 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2297 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2300 btrfs_release_path(path
);
2301 key
.objectid
= key
.offset
;
2302 key
.offset
= (u64
)-1;
2303 dirid
= key
.objectid
;
2305 memmove(name
, ptr
, total_len
);
2306 name
[total_len
] = '\0';
2309 btrfs_free_path(path
);
2313 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2316 struct btrfs_ioctl_ino_lookup_args
*args
;
2317 struct inode
*inode
;
2320 args
= memdup_user(argp
, sizeof(*args
));
2322 return PTR_ERR(args
);
2324 inode
= file_inode(file
);
2327 * Unprivileged query to obtain the containing subvolume root id. The
2328 * path is reset so it's consistent with btrfs_search_path_in_tree.
2330 if (args
->treeid
== 0)
2331 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2333 if (args
->objectid
== BTRFS_FIRST_FREE_OBJECTID
) {
2338 if (!capable(CAP_SYS_ADMIN
)) {
2343 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2344 args
->treeid
, args
->objectid
,
2348 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2355 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2358 struct dentry
*parent
= file
->f_path
.dentry
;
2359 struct btrfs_fs_info
*fs_info
= btrfs_sb(parent
->d_sb
);
2360 struct dentry
*dentry
;
2361 struct inode
*dir
= d_inode(parent
);
2362 struct inode
*inode
;
2363 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2364 struct btrfs_root
*dest
= NULL
;
2365 struct btrfs_ioctl_vol_args
*vol_args
;
2366 struct btrfs_trans_handle
*trans
;
2367 struct btrfs_block_rsv block_rsv
;
2369 u64 qgroup_reserved
;
2374 if (!S_ISDIR(dir
->i_mode
))
2377 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2378 if (IS_ERR(vol_args
))
2379 return PTR_ERR(vol_args
);
2381 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2382 namelen
= strlen(vol_args
->name
);
2383 if (strchr(vol_args
->name
, '/') ||
2384 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2389 err
= mnt_want_write_file(file
);
2394 err
= down_write_killable_nested(&dir
->i_rwsem
, I_MUTEX_PARENT
);
2396 goto out_drop_write
;
2397 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2398 if (IS_ERR(dentry
)) {
2399 err
= PTR_ERR(dentry
);
2400 goto out_unlock_dir
;
2403 if (d_really_is_negative(dentry
)) {
2408 inode
= d_inode(dentry
);
2409 dest
= BTRFS_I(inode
)->root
;
2410 if (!capable(CAP_SYS_ADMIN
)) {
2412 * Regular user. Only allow this with a special mount
2413 * option, when the user has write+exec access to the
2414 * subvol root, and when rmdir(2) would have been
2417 * Note that this is _not_ check that the subvol is
2418 * empty or doesn't contain data that we wouldn't
2419 * otherwise be able to delete.
2421 * Users who want to delete empty subvols should try
2425 if (!btrfs_test_opt(fs_info
, USER_SUBVOL_RM_ALLOWED
))
2429 * Do not allow deletion if the parent dir is the same
2430 * as the dir to be deleted. That means the ioctl
2431 * must be called on the dentry referencing the root
2432 * of the subvol, not a random directory contained
2439 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2444 /* check if subvolume may be deleted by a user */
2445 err
= btrfs_may_delete(dir
, dentry
, 1);
2449 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
2457 * Don't allow to delete a subvolume with send in progress. This is
2458 * inside the i_mutex so the error handling that has to drop the bit
2459 * again is not run concurrently.
2461 spin_lock(&dest
->root_item_lock
);
2462 root_flags
= btrfs_root_flags(&dest
->root_item
);
2463 if (dest
->send_in_progress
== 0) {
2464 btrfs_set_root_flags(&dest
->root_item
,
2465 root_flags
| BTRFS_ROOT_SUBVOL_DEAD
);
2466 spin_unlock(&dest
->root_item_lock
);
2468 spin_unlock(&dest
->root_item_lock
);
2470 "Attempt to delete subvolume %llu during send",
2471 dest
->root_key
.objectid
);
2473 goto out_unlock_inode
;
2476 down_write(&fs_info
->subvol_sem
);
2478 err
= may_destroy_subvol(dest
);
2482 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
2484 * One for dir inode, two for dir entries, two for root
2487 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
2488 5, &qgroup_reserved
, true);
2492 trans
= btrfs_start_transaction(root
, 0);
2493 if (IS_ERR(trans
)) {
2494 err
= PTR_ERR(trans
);
2497 trans
->block_rsv
= &block_rsv
;
2498 trans
->bytes_reserved
= block_rsv
.size
;
2500 btrfs_record_snapshot_destroy(trans
, dir
);
2502 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
2503 dest
->root_key
.objectid
,
2504 dentry
->d_name
.name
,
2505 dentry
->d_name
.len
);
2508 btrfs_abort_transaction(trans
, ret
);
2512 btrfs_record_root_in_trans(trans
, dest
);
2514 memset(&dest
->root_item
.drop_progress
, 0,
2515 sizeof(dest
->root_item
.drop_progress
));
2516 dest
->root_item
.drop_level
= 0;
2517 btrfs_set_root_refs(&dest
->root_item
, 0);
2519 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &dest
->state
)) {
2520 ret
= btrfs_insert_orphan_item(trans
,
2522 dest
->root_key
.objectid
);
2524 btrfs_abort_transaction(trans
, ret
);
2530 ret
= btrfs_uuid_tree_rem(trans
, fs_info
, dest
->root_item
.uuid
,
2531 BTRFS_UUID_KEY_SUBVOL
,
2532 dest
->root_key
.objectid
);
2533 if (ret
&& ret
!= -ENOENT
) {
2534 btrfs_abort_transaction(trans
, ret
);
2538 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
2539 ret
= btrfs_uuid_tree_rem(trans
, fs_info
,
2540 dest
->root_item
.received_uuid
,
2541 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
2542 dest
->root_key
.objectid
);
2543 if (ret
&& ret
!= -ENOENT
) {
2544 btrfs_abort_transaction(trans
, ret
);
2551 trans
->block_rsv
= NULL
;
2552 trans
->bytes_reserved
= 0;
2553 ret
= btrfs_end_transaction(trans
);
2556 inode
->i_flags
|= S_DEAD
;
2558 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
, qgroup_reserved
);
2560 up_write(&fs_info
->subvol_sem
);
2562 spin_lock(&dest
->root_item_lock
);
2563 root_flags
= btrfs_root_flags(&dest
->root_item
);
2564 btrfs_set_root_flags(&dest
->root_item
,
2565 root_flags
& ~BTRFS_ROOT_SUBVOL_DEAD
);
2566 spin_unlock(&dest
->root_item_lock
);
2569 inode_unlock(inode
);
2571 d_invalidate(dentry
);
2572 btrfs_invalidate_inodes(dest
);
2574 ASSERT(dest
->send_in_progress
== 0);
2577 if (dest
->ino_cache_inode
) {
2578 iput(dest
->ino_cache_inode
);
2579 dest
->ino_cache_inode
= NULL
;
2587 mnt_drop_write_file(file
);
2593 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2595 struct inode
*inode
= file_inode(file
);
2596 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2597 struct btrfs_ioctl_defrag_range_args
*range
;
2600 ret
= mnt_want_write_file(file
);
2604 if (btrfs_root_readonly(root
)) {
2609 switch (inode
->i_mode
& S_IFMT
) {
2611 if (!capable(CAP_SYS_ADMIN
)) {
2615 ret
= btrfs_defrag_root(root
);
2618 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
);
2621 if (!(file
->f_mode
& FMODE_WRITE
)) {
2626 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2633 if (copy_from_user(range
, argp
,
2639 /* compression requires us to start the IO */
2640 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2641 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2642 range
->extent_thresh
= (u32
)-1;
2645 /* the rest are all set to zero by kzalloc */
2646 range
->len
= (u64
)-1;
2648 ret
= btrfs_defrag_file(file_inode(file
), file
,
2658 mnt_drop_write_file(file
);
2662 static long btrfs_ioctl_add_dev(struct btrfs_fs_info
*fs_info
, void __user
*arg
)
2664 struct btrfs_ioctl_vol_args
*vol_args
;
2667 if (!capable(CAP_SYS_ADMIN
))
2670 if (atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1))
2671 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2673 mutex_lock(&fs_info
->volume_mutex
);
2674 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2675 if (IS_ERR(vol_args
)) {
2676 ret
= PTR_ERR(vol_args
);
2680 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2681 ret
= btrfs_init_new_device(fs_info
, vol_args
->name
);
2684 btrfs_info(fs_info
, "disk added %s", vol_args
->name
);
2688 mutex_unlock(&fs_info
->volume_mutex
);
2689 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
2693 static long btrfs_ioctl_rm_dev_v2(struct file
*file
, void __user
*arg
)
2695 struct inode
*inode
= file_inode(file
);
2696 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2697 struct btrfs_ioctl_vol_args_v2
*vol_args
;
2700 if (!capable(CAP_SYS_ADMIN
))
2703 ret
= mnt_want_write_file(file
);
2707 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2708 if (IS_ERR(vol_args
)) {
2709 ret
= PTR_ERR(vol_args
);
2713 /* Check for compatibility reject unknown flags */
2714 if (vol_args
->flags
& ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED
)
2717 if (atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
2718 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2722 mutex_lock(&fs_info
->volume_mutex
);
2723 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
) {
2724 ret
= btrfs_rm_device(fs_info
, NULL
, vol_args
->devid
);
2726 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
2727 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0);
2729 mutex_unlock(&fs_info
->volume_mutex
);
2730 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
2733 if (vol_args
->flags
& BTRFS_DEVICE_SPEC_BY_ID
)
2734 btrfs_info(fs_info
, "device deleted: id %llu",
2737 btrfs_info(fs_info
, "device deleted: %s",
2743 mnt_drop_write_file(file
);
2747 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
2749 struct inode
*inode
= file_inode(file
);
2750 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2751 struct btrfs_ioctl_vol_args
*vol_args
;
2754 if (!capable(CAP_SYS_ADMIN
))
2757 ret
= mnt_want_write_file(file
);
2761 if (atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
2762 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2763 goto out_drop_write
;
2766 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2767 if (IS_ERR(vol_args
)) {
2768 ret
= PTR_ERR(vol_args
);
2772 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2773 mutex_lock(&fs_info
->volume_mutex
);
2774 ret
= btrfs_rm_device(fs_info
, vol_args
->name
, 0);
2775 mutex_unlock(&fs_info
->volume_mutex
);
2778 btrfs_info(fs_info
, "disk deleted %s", vol_args
->name
);
2781 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
2783 mnt_drop_write_file(file
);
2788 static long btrfs_ioctl_fs_info(struct btrfs_fs_info
*fs_info
,
2791 struct btrfs_ioctl_fs_info_args
*fi_args
;
2792 struct btrfs_device
*device
;
2793 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
2796 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
2800 mutex_lock(&fs_devices
->device_list_mutex
);
2801 fi_args
->num_devices
= fs_devices
->num_devices
;
2802 memcpy(&fi_args
->fsid
, fs_info
->fsid
, sizeof(fi_args
->fsid
));
2804 list_for_each_entry(device
, &fs_devices
->devices
, dev_list
) {
2805 if (device
->devid
> fi_args
->max_id
)
2806 fi_args
->max_id
= device
->devid
;
2808 mutex_unlock(&fs_devices
->device_list_mutex
);
2810 fi_args
->nodesize
= fs_info
->super_copy
->nodesize
;
2811 fi_args
->sectorsize
= fs_info
->super_copy
->sectorsize
;
2812 fi_args
->clone_alignment
= fs_info
->super_copy
->sectorsize
;
2814 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
2821 static long btrfs_ioctl_dev_info(struct btrfs_fs_info
*fs_info
,
2824 struct btrfs_ioctl_dev_info_args
*di_args
;
2825 struct btrfs_device
*dev
;
2826 struct btrfs_fs_devices
*fs_devices
= fs_info
->fs_devices
;
2828 char *s_uuid
= NULL
;
2830 di_args
= memdup_user(arg
, sizeof(*di_args
));
2831 if (IS_ERR(di_args
))
2832 return PTR_ERR(di_args
);
2834 if (!btrfs_is_empty_uuid(di_args
->uuid
))
2835 s_uuid
= di_args
->uuid
;
2837 mutex_lock(&fs_devices
->device_list_mutex
);
2838 dev
= btrfs_find_device(fs_info
, di_args
->devid
, s_uuid
, NULL
);
2845 di_args
->devid
= dev
->devid
;
2846 di_args
->bytes_used
= btrfs_device_get_bytes_used(dev
);
2847 di_args
->total_bytes
= btrfs_device_get_total_bytes(dev
);
2848 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
2850 struct rcu_string
*name
;
2853 name
= rcu_dereference(dev
->name
);
2854 strncpy(di_args
->path
, name
->str
, sizeof(di_args
->path
));
2856 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
2858 di_args
->path
[0] = '\0';
2862 mutex_unlock(&fs_devices
->device_list_mutex
);
2863 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
2870 static struct page
*extent_same_get_page(struct inode
*inode
, pgoff_t index
)
2874 page
= grab_cache_page(inode
->i_mapping
, index
);
2876 return ERR_PTR(-ENOMEM
);
2878 if (!PageUptodate(page
)) {
2881 ret
= btrfs_readpage(NULL
, page
);
2883 return ERR_PTR(ret
);
2885 if (!PageUptodate(page
)) {
2888 return ERR_PTR(-EIO
);
2890 if (page
->mapping
!= inode
->i_mapping
) {
2893 return ERR_PTR(-EAGAIN
);
2900 static int gather_extent_pages(struct inode
*inode
, struct page
**pages
,
2901 int num_pages
, u64 off
)
2904 pgoff_t index
= off
>> PAGE_SHIFT
;
2906 for (i
= 0; i
< num_pages
; i
++) {
2908 pages
[i
] = extent_same_get_page(inode
, index
+ i
);
2909 if (IS_ERR(pages
[i
])) {
2910 int err
= PTR_ERR(pages
[i
]);
2921 static int lock_extent_range(struct inode
*inode
, u64 off
, u64 len
,
2922 bool retry_range_locking
)
2925 * Do any pending delalloc/csum calculations on inode, one way or
2926 * another, and lock file content.
2927 * The locking order is:
2930 * 2) range in the inode's io tree
2933 struct btrfs_ordered_extent
*ordered
;
2934 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2935 ordered
= btrfs_lookup_first_ordered_extent(inode
,
2938 ordered
->file_offset
+ ordered
->len
<= off
||
2939 ordered
->file_offset
>= off
+ len
) &&
2940 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
2941 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
)) {
2943 btrfs_put_ordered_extent(ordered
);
2946 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2948 btrfs_put_ordered_extent(ordered
);
2949 if (!retry_range_locking
)
2951 btrfs_wait_ordered_range(inode
, off
, len
);
2956 static void btrfs_double_inode_unlock(struct inode
*inode1
, struct inode
*inode2
)
2958 inode_unlock(inode1
);
2959 inode_unlock(inode2
);
2962 static void btrfs_double_inode_lock(struct inode
*inode1
, struct inode
*inode2
)
2964 if (inode1
< inode2
)
2965 swap(inode1
, inode2
);
2967 inode_lock_nested(inode1
, I_MUTEX_PARENT
);
2968 inode_lock_nested(inode2
, I_MUTEX_CHILD
);
2971 static void btrfs_double_extent_unlock(struct inode
*inode1
, u64 loff1
,
2972 struct inode
*inode2
, u64 loff2
, u64 len
)
2974 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
2975 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
2978 static int btrfs_double_extent_lock(struct inode
*inode1
, u64 loff1
,
2979 struct inode
*inode2
, u64 loff2
, u64 len
,
2980 bool retry_range_locking
)
2984 if (inode1
< inode2
) {
2985 swap(inode1
, inode2
);
2988 ret
= lock_extent_range(inode1
, loff1
, len
, retry_range_locking
);
2991 ret
= lock_extent_range(inode2
, loff2
, len
, retry_range_locking
);
2993 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
,
3000 struct page
**src_pages
;
3001 struct page
**dst_pages
;
3004 static void btrfs_cmp_data_free(struct cmp_pages
*cmp
)
3009 for (i
= 0; i
< cmp
->num_pages
; i
++) {
3010 pg
= cmp
->src_pages
[i
];
3015 pg
= cmp
->dst_pages
[i
];
3021 kfree(cmp
->src_pages
);
3022 kfree(cmp
->dst_pages
);
3025 static int btrfs_cmp_data_prepare(struct inode
*src
, u64 loff
,
3026 struct inode
*dst
, u64 dst_loff
,
3027 u64 len
, struct cmp_pages
*cmp
)
3030 int num_pages
= PAGE_ALIGN(len
) >> PAGE_SHIFT
;
3031 struct page
**src_pgarr
, **dst_pgarr
;
3034 * We must gather up all the pages before we initiate our
3035 * extent locking. We use an array for the page pointers. Size
3036 * of the array is bounded by len, which is in turn bounded by
3037 * BTRFS_MAX_DEDUPE_LEN.
3039 src_pgarr
= kcalloc(num_pages
, sizeof(struct page
*), GFP_KERNEL
);
3040 dst_pgarr
= kcalloc(num_pages
, sizeof(struct page
*), GFP_KERNEL
);
3041 if (!src_pgarr
|| !dst_pgarr
) {
3046 cmp
->num_pages
= num_pages
;
3047 cmp
->src_pages
= src_pgarr
;
3048 cmp
->dst_pages
= dst_pgarr
;
3050 ret
= gather_extent_pages(src
, cmp
->src_pages
, cmp
->num_pages
, loff
);
3054 ret
= gather_extent_pages(dst
, cmp
->dst_pages
, cmp
->num_pages
, dst_loff
);
3058 btrfs_cmp_data_free(cmp
);
3062 static int btrfs_cmp_data(struct inode
*src
, u64 loff
, struct inode
*dst
,
3063 u64 dst_loff
, u64 len
, struct cmp_pages
*cmp
)
3067 struct page
*src_page
, *dst_page
;
3068 unsigned int cmp_len
= PAGE_SIZE
;
3069 void *addr
, *dst_addr
;
3073 if (len
< PAGE_SIZE
)
3076 BUG_ON(i
>= cmp
->num_pages
);
3078 src_page
= cmp
->src_pages
[i
];
3079 dst_page
= cmp
->dst_pages
[i
];
3080 ASSERT(PageLocked(src_page
));
3081 ASSERT(PageLocked(dst_page
));
3083 addr
= kmap_atomic(src_page
);
3084 dst_addr
= kmap_atomic(dst_page
);
3086 flush_dcache_page(src_page
);
3087 flush_dcache_page(dst_page
);
3089 if (memcmp(addr
, dst_addr
, cmp_len
))
3092 kunmap_atomic(addr
);
3093 kunmap_atomic(dst_addr
);
3105 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64
*plen
,
3109 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
3111 if (off
+ olen
> inode
->i_size
|| off
+ olen
< off
)
3114 /* if we extend to eof, continue to block boundary */
3115 if (off
+ len
== inode
->i_size
)
3116 *plen
= len
= ALIGN(inode
->i_size
, bs
) - off
;
3118 /* Check that we are block aligned - btrfs_clone() requires this */
3119 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
3125 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 olen
,
3126 struct inode
*dst
, u64 dst_loff
)
3130 struct cmp_pages cmp
;
3132 u64 same_lock_start
= 0;
3133 u64 same_lock_len
= 0;
3144 ret
= extent_same_check_offsets(src
, loff
, &len
, olen
);
3147 ret
= extent_same_check_offsets(src
, dst_loff
, &len
, olen
);
3152 * Single inode case wants the same checks, except we
3153 * don't want our length pushed out past i_size as
3154 * comparing that data range makes no sense.
3156 * extent_same_check_offsets() will do this for an
3157 * unaligned length at i_size, so catch it here and
3158 * reject the request.
3160 * This effectively means we require aligned extents
3161 * for the single-inode case, whereas the other cases
3162 * allow an unaligned length so long as it ends at
3170 /* Check for overlapping ranges */
3171 if (dst_loff
+ len
> loff
&& dst_loff
< loff
+ len
) {
3176 same_lock_start
= min_t(u64
, loff
, dst_loff
);
3177 same_lock_len
= max_t(u64
, loff
, dst_loff
) + len
- same_lock_start
;
3179 btrfs_double_inode_lock(src
, dst
);
3181 ret
= extent_same_check_offsets(src
, loff
, &len
, olen
);
3185 ret
= extent_same_check_offsets(dst
, dst_loff
, &len
, olen
);
3190 /* don't make the dst file partly checksummed */
3191 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3192 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
3198 ret
= btrfs_cmp_data_prepare(src
, loff
, dst
, dst_loff
, olen
, &cmp
);
3203 ret
= lock_extent_range(src
, same_lock_start
, same_lock_len
,
3206 ret
= btrfs_double_extent_lock(src
, loff
, dst
, dst_loff
, len
,
3209 * If one of the inodes has dirty pages in the respective range or
3210 * ordered extents, we need to flush dellaloc and wait for all ordered
3211 * extents in the range. We must unlock the pages and the ranges in the
3212 * io trees to avoid deadlocks when flushing delalloc (requires locking
3213 * pages) and when waiting for ordered extents to complete (they require
3216 if (ret
== -EAGAIN
) {
3218 * Ranges in the io trees already unlocked. Now unlock all
3219 * pages before waiting for all IO to complete.
3221 btrfs_cmp_data_free(&cmp
);
3223 btrfs_wait_ordered_range(src
, same_lock_start
,
3226 btrfs_wait_ordered_range(src
, loff
, len
);
3227 btrfs_wait_ordered_range(dst
, dst_loff
, len
);
3233 /* ranges in the io trees already unlocked */
3234 btrfs_cmp_data_free(&cmp
);
3238 /* pass original length for comparison so we stay within i_size */
3239 ret
= btrfs_cmp_data(src
, loff
, dst
, dst_loff
, olen
, &cmp
);
3241 ret
= btrfs_clone(src
, dst
, loff
, olen
, len
, dst_loff
, 1);
3244 unlock_extent(&BTRFS_I(src
)->io_tree
, same_lock_start
,
3245 same_lock_start
+ same_lock_len
- 1);
3247 btrfs_double_extent_unlock(src
, loff
, dst
, dst_loff
, len
);
3249 btrfs_cmp_data_free(&cmp
);
3254 btrfs_double_inode_unlock(src
, dst
);
3259 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3261 ssize_t
btrfs_dedupe_file_range(struct file
*src_file
, u64 loff
, u64 olen
,
3262 struct file
*dst_file
, u64 dst_loff
)
3264 struct inode
*src
= file_inode(src_file
);
3265 struct inode
*dst
= file_inode(dst_file
);
3266 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
3269 if (olen
> BTRFS_MAX_DEDUPE_LEN
)
3270 olen
= BTRFS_MAX_DEDUPE_LEN
;
3272 if (WARN_ON_ONCE(bs
< PAGE_SIZE
)) {
3274 * Btrfs does not support blocksize < page_size. As a
3275 * result, btrfs_cmp_data() won't correctly handle
3276 * this situation without an update.
3281 res
= btrfs_extent_same(src
, loff
, olen
, dst
, dst_loff
);
3287 static int clone_finish_inode_update(struct btrfs_trans_handle
*trans
,
3288 struct inode
*inode
,
3294 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3297 inode_inc_iversion(inode
);
3298 if (!no_time_update
)
3299 inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
3301 * We round up to the block size at eof when determining which
3302 * extents to clone above, but shouldn't round up the file size.
3304 if (endoff
> destoff
+ olen
)
3305 endoff
= destoff
+ olen
;
3306 if (endoff
> inode
->i_size
)
3307 btrfs_i_size_write(inode
, endoff
);
3309 ret
= btrfs_update_inode(trans
, root
, inode
);
3311 btrfs_abort_transaction(trans
, ret
);
3312 btrfs_end_transaction(trans
);
3315 ret
= btrfs_end_transaction(trans
);
3320 static void clone_update_extent_map(struct inode
*inode
,
3321 const struct btrfs_trans_handle
*trans
,
3322 const struct btrfs_path
*path
,
3323 const u64 hole_offset
,
3326 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
3327 struct extent_map
*em
;
3330 em
= alloc_extent_map();
3332 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3333 &BTRFS_I(inode
)->runtime_flags
);
3338 struct btrfs_file_extent_item
*fi
;
3340 fi
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3341 struct btrfs_file_extent_item
);
3342 btrfs_extent_item_to_extent_map(inode
, path
, fi
, false, em
);
3343 em
->generation
= -1;
3344 if (btrfs_file_extent_type(path
->nodes
[0], fi
) ==
3345 BTRFS_FILE_EXTENT_INLINE
)
3346 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3347 &BTRFS_I(inode
)->runtime_flags
);
3349 em
->start
= hole_offset
;
3351 em
->ram_bytes
= em
->len
;
3352 em
->orig_start
= hole_offset
;
3353 em
->block_start
= EXTENT_MAP_HOLE
;
3355 em
->orig_block_len
= 0;
3356 em
->compress_type
= BTRFS_COMPRESS_NONE
;
3357 em
->generation
= trans
->transid
;
3361 write_lock(&em_tree
->lock
);
3362 ret
= add_extent_mapping(em_tree
, em
, 1);
3363 write_unlock(&em_tree
->lock
);
3364 if (ret
!= -EEXIST
) {
3365 free_extent_map(em
);
3368 btrfs_drop_extent_cache(inode
, em
->start
,
3369 em
->start
+ em
->len
- 1, 0);
3373 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3374 &BTRFS_I(inode
)->runtime_flags
);
3378 * Make sure we do not end up inserting an inline extent into a file that has
3379 * already other (non-inline) extents. If a file has an inline extent it can
3380 * not have any other extents and the (single) inline extent must start at the
3381 * file offset 0. Failing to respect these rules will lead to file corruption,
3382 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3384 * We can have extents that have been already written to disk or we can have
3385 * dirty ranges still in delalloc, in which case the extent maps and items are
3386 * created only when we run delalloc, and the delalloc ranges might fall outside
3387 * the range we are currently locking in the inode's io tree. So we check the
3388 * inode's i_size because of that (i_size updates are done while holding the
3389 * i_mutex, which we are holding here).
3390 * We also check to see if the inode has a size not greater than "datal" but has
3391 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3392 * protected against such concurrent fallocate calls by the i_mutex).
3394 * If the file has no extents but a size greater than datal, do not allow the
3395 * copy because we would need turn the inline extent into a non-inline one (even
3396 * with NO_HOLES enabled). If we find our destination inode only has one inline
3397 * extent, just overwrite it with the source inline extent if its size is less
3398 * than the source extent's size, or we could copy the source inline extent's
3399 * data into the destination inode's inline extent if the later is greater then
3402 static int clone_copy_inline_extent(struct inode
*src
,
3404 struct btrfs_trans_handle
*trans
,
3405 struct btrfs_path
*path
,
3406 struct btrfs_key
*new_key
,
3407 const u64 drop_start
,
3413 struct btrfs_fs_info
*fs_info
= btrfs_sb(dst
->i_sb
);
3414 struct btrfs_root
*root
= BTRFS_I(dst
)->root
;
3415 const u64 aligned_end
= ALIGN(new_key
->offset
+ datal
,
3416 fs_info
->sectorsize
);
3418 struct btrfs_key key
;
3420 if (new_key
->offset
> 0)
3423 key
.objectid
= btrfs_ino(dst
);
3424 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3426 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3429 } else if (ret
> 0) {
3430 if (path
->slots
[0] >= btrfs_header_nritems(path
->nodes
[0])) {
3431 ret
= btrfs_next_leaf(root
, path
);
3435 goto copy_inline_extent
;
3437 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
3438 if (key
.objectid
== btrfs_ino(dst
) &&
3439 key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3440 ASSERT(key
.offset
> 0);
3443 } else if (i_size_read(dst
) <= datal
) {
3444 struct btrfs_file_extent_item
*ei
;
3448 * If the file size is <= datal, make sure there are no other
3449 * extents following (can happen do to an fallocate call with
3450 * the flag FALLOC_FL_KEEP_SIZE).
3452 ei
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3453 struct btrfs_file_extent_item
);
3455 * If it's an inline extent, it can not have other extents
3458 if (btrfs_file_extent_type(path
->nodes
[0], ei
) ==
3459 BTRFS_FILE_EXTENT_INLINE
)
3460 goto copy_inline_extent
;
3462 ext_len
= btrfs_file_extent_num_bytes(path
->nodes
[0], ei
);
3463 if (ext_len
> aligned_end
)
3466 ret
= btrfs_next_item(root
, path
);
3469 } else if (ret
== 0) {
3470 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3472 if (key
.objectid
== btrfs_ino(dst
) &&
3473 key
.type
== BTRFS_EXTENT_DATA_KEY
)
3480 * We have no extent items, or we have an extent at offset 0 which may
3481 * or may not be inlined. All these cases are dealt the same way.
3483 if (i_size_read(dst
) > datal
) {
3485 * If the destination inode has an inline extent...
3486 * This would require copying the data from the source inline
3487 * extent into the beginning of the destination's inline extent.
3488 * But this is really complex, both extents can be compressed
3489 * or just one of them, which would require decompressing and
3490 * re-compressing data (which could increase the new compressed
3491 * size, not allowing the compressed data to fit anymore in an
3493 * So just don't support this case for now (it should be rare,
3494 * we are not really saving space when cloning inline extents).
3499 btrfs_release_path(path
);
3500 ret
= btrfs_drop_extents(trans
, root
, dst
, drop_start
, aligned_end
, 1);
3503 ret
= btrfs_insert_empty_item(trans
, root
, path
, new_key
, size
);
3508 const u32 start
= btrfs_file_extent_calc_inline_size(0);
3510 memmove(inline_data
+ start
, inline_data
+ start
+ skip
, datal
);
3513 write_extent_buffer(path
->nodes
[0], inline_data
,
3514 btrfs_item_ptr_offset(path
->nodes
[0],
3517 inode_add_bytes(dst
, datal
);
3523 * btrfs_clone() - clone a range from inode file to another
3525 * @src: Inode to clone from
3526 * @inode: Inode to clone to
3527 * @off: Offset within source to start clone from
3528 * @olen: Original length, passed by user, of range to clone
3529 * @olen_aligned: Block-aligned value of olen
3530 * @destoff: Offset within @inode to start clone
3531 * @no_time_update: Whether to update mtime/ctime on the target inode
3533 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
3534 const u64 off
, const u64 olen
, const u64 olen_aligned
,
3535 const u64 destoff
, int no_time_update
)
3537 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3538 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3539 struct btrfs_path
*path
= NULL
;
3540 struct extent_buffer
*leaf
;
3541 struct btrfs_trans_handle
*trans
;
3543 struct btrfs_key key
;
3547 const u64 len
= olen_aligned
;
3548 u64 last_dest_end
= destoff
;
3551 buf
= kmalloc(fs_info
->nodesize
, GFP_KERNEL
| __GFP_NOWARN
);
3553 buf
= vmalloc(fs_info
->nodesize
);
3558 path
= btrfs_alloc_path();
3564 path
->reada
= READA_FORWARD
;
3566 key
.objectid
= btrfs_ino(src
);
3567 key
.type
= BTRFS_EXTENT_DATA_KEY
;
3571 u64 next_key_min_offset
= key
.offset
+ 1;
3574 * note the key will change type as we walk through the
3577 path
->leave_spinning
= 1;
3578 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
3583 * First search, if no extent item that starts at offset off was
3584 * found but the previous item is an extent item, it's possible
3585 * it might overlap our target range, therefore process it.
3587 if (key
.offset
== off
&& ret
> 0 && path
->slots
[0] > 0) {
3588 btrfs_item_key_to_cpu(path
->nodes
[0], &key
,
3589 path
->slots
[0] - 1);
3590 if (key
.type
== BTRFS_EXTENT_DATA_KEY
)
3594 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3596 if (path
->slots
[0] >= nritems
) {
3597 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
3602 nritems
= btrfs_header_nritems(path
->nodes
[0]);
3604 leaf
= path
->nodes
[0];
3605 slot
= path
->slots
[0];
3607 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
3608 if (key
.type
> BTRFS_EXTENT_DATA_KEY
||
3609 key
.objectid
!= btrfs_ino(src
))
3612 if (key
.type
== BTRFS_EXTENT_DATA_KEY
) {
3613 struct btrfs_file_extent_item
*extent
;
3616 struct btrfs_key new_key
;
3617 u64 disko
= 0, diskl
= 0;
3618 u64 datao
= 0, datal
= 0;
3622 extent
= btrfs_item_ptr(leaf
, slot
,
3623 struct btrfs_file_extent_item
);
3624 comp
= btrfs_file_extent_compression(leaf
, extent
);
3625 type
= btrfs_file_extent_type(leaf
, extent
);
3626 if (type
== BTRFS_FILE_EXTENT_REG
||
3627 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3628 disko
= btrfs_file_extent_disk_bytenr(leaf
,
3630 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
3632 datao
= btrfs_file_extent_offset(leaf
, extent
);
3633 datal
= btrfs_file_extent_num_bytes(leaf
,
3635 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3636 /* take upper bound, may be compressed */
3637 datal
= btrfs_file_extent_ram_bytes(leaf
,
3642 * The first search might have left us at an extent
3643 * item that ends before our target range's start, can
3644 * happen if we have holes and NO_HOLES feature enabled.
3646 if (key
.offset
+ datal
<= off
) {
3649 } else if (key
.offset
>= off
+ len
) {
3652 next_key_min_offset
= key
.offset
+ datal
;
3653 size
= btrfs_item_size_nr(leaf
, slot
);
3654 read_extent_buffer(leaf
, buf
,
3655 btrfs_item_ptr_offset(leaf
, slot
),
3658 btrfs_release_path(path
);
3659 path
->leave_spinning
= 0;
3661 memcpy(&new_key
, &key
, sizeof(new_key
));
3662 new_key
.objectid
= btrfs_ino(inode
);
3663 if (off
<= key
.offset
)
3664 new_key
.offset
= key
.offset
+ destoff
- off
;
3666 new_key
.offset
= destoff
;
3669 * Deal with a hole that doesn't have an extent item
3670 * that represents it (NO_HOLES feature enabled).
3671 * This hole is either in the middle of the cloning
3672 * range or at the beginning (fully overlaps it or
3673 * partially overlaps it).
3675 if (new_key
.offset
!= last_dest_end
)
3676 drop_start
= last_dest_end
;
3678 drop_start
= new_key
.offset
;
3681 * 1 - adjusting old extent (we may have to split it)
3682 * 1 - add new extent
3685 trans
= btrfs_start_transaction(root
, 3);
3686 if (IS_ERR(trans
)) {
3687 ret
= PTR_ERR(trans
);
3691 if (type
== BTRFS_FILE_EXTENT_REG
||
3692 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3694 * a | --- range to clone ---| b
3695 * | ------------- extent ------------- |
3698 /* subtract range b */
3699 if (key
.offset
+ datal
> off
+ len
)
3700 datal
= off
+ len
- key
.offset
;
3702 /* subtract range a */
3703 if (off
> key
.offset
) {
3704 datao
+= off
- key
.offset
;
3705 datal
-= off
- key
.offset
;
3708 ret
= btrfs_drop_extents(trans
, root
, inode
,
3710 new_key
.offset
+ datal
,
3713 if (ret
!= -EOPNOTSUPP
)
3714 btrfs_abort_transaction(trans
,
3716 btrfs_end_transaction(trans
);
3720 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3723 btrfs_abort_transaction(trans
, ret
);
3724 btrfs_end_transaction(trans
);
3728 leaf
= path
->nodes
[0];
3729 slot
= path
->slots
[0];
3730 write_extent_buffer(leaf
, buf
,
3731 btrfs_item_ptr_offset(leaf
, slot
),
3734 extent
= btrfs_item_ptr(leaf
, slot
,
3735 struct btrfs_file_extent_item
);
3737 /* disko == 0 means it's a hole */
3741 btrfs_set_file_extent_offset(leaf
, extent
,
3743 btrfs_set_file_extent_num_bytes(leaf
, extent
,
3747 inode_add_bytes(inode
, datal
);
3748 ret
= btrfs_inc_extent_ref(trans
,
3751 root
->root_key
.objectid
,
3753 new_key
.offset
- datao
);
3755 btrfs_abort_transaction(trans
,
3757 btrfs_end_transaction(trans
);
3762 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3766 if (off
> key
.offset
) {
3767 skip
= off
- key
.offset
;
3768 new_key
.offset
+= skip
;
3771 if (key
.offset
+ datal
> off
+ len
)
3772 trim
= key
.offset
+ datal
- (off
+ len
);
3774 if (comp
&& (skip
|| trim
)) {
3776 btrfs_end_transaction(trans
);
3779 size
-= skip
+ trim
;
3780 datal
-= skip
+ trim
;
3782 ret
= clone_copy_inline_extent(src
, inode
,
3789 if (ret
!= -EOPNOTSUPP
)
3790 btrfs_abort_transaction(trans
,
3792 btrfs_end_transaction(trans
);
3795 leaf
= path
->nodes
[0];
3796 slot
= path
->slots
[0];
3799 /* If we have an implicit hole (NO_HOLES feature). */
3800 if (drop_start
< new_key
.offset
)
3801 clone_update_extent_map(inode
, trans
,
3803 new_key
.offset
- drop_start
);
3805 clone_update_extent_map(inode
, trans
, path
, 0, 0);
3807 btrfs_mark_buffer_dirty(leaf
);
3808 btrfs_release_path(path
);
3810 last_dest_end
= ALIGN(new_key
.offset
+ datal
,
3811 fs_info
->sectorsize
);
3812 ret
= clone_finish_inode_update(trans
, inode
,
3818 if (new_key
.offset
+ datal
>= destoff
+ len
)
3821 btrfs_release_path(path
);
3822 key
.offset
= next_key_min_offset
;
3824 if (fatal_signal_pending(current
)) {
3831 if (last_dest_end
< destoff
+ len
) {
3833 * We have an implicit hole (NO_HOLES feature is enabled) that
3834 * fully or partially overlaps our cloning range at its end.
3836 btrfs_release_path(path
);
3839 * 1 - remove extent(s)
3842 trans
= btrfs_start_transaction(root
, 2);
3843 if (IS_ERR(trans
)) {
3844 ret
= PTR_ERR(trans
);
3847 ret
= btrfs_drop_extents(trans
, root
, inode
,
3848 last_dest_end
, destoff
+ len
, 1);
3850 if (ret
!= -EOPNOTSUPP
)
3851 btrfs_abort_transaction(trans
, ret
);
3852 btrfs_end_transaction(trans
);
3855 clone_update_extent_map(inode
, trans
, NULL
, last_dest_end
,
3856 destoff
+ len
- last_dest_end
);
3857 ret
= clone_finish_inode_update(trans
, inode
, destoff
+ len
,
3858 destoff
, olen
, no_time_update
);
3862 btrfs_free_path(path
);
3867 static noinline
int btrfs_clone_files(struct file
*file
, struct file
*file_src
,
3868 u64 off
, u64 olen
, u64 destoff
)
3870 struct inode
*inode
= file_inode(file
);
3871 struct inode
*src
= file_inode(file_src
);
3872 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3873 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3876 u64 bs
= fs_info
->sb
->s_blocksize
;
3877 int same_inode
= src
== inode
;
3881 * - split compressed inline extents. annoying: we need to
3882 * decompress into destination's address_space (the file offset
3883 * may change, so source mapping won't do), then recompress (or
3884 * otherwise reinsert) a subrange.
3886 * - split destination inode's inline extents. The inline extents can
3887 * be either compressed or non-compressed.
3890 if (btrfs_root_readonly(root
))
3893 if (file_src
->f_path
.mnt
!= file
->f_path
.mnt
||
3894 src
->i_sb
!= inode
->i_sb
)
3897 /* don't make the dst file partly checksummed */
3898 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3899 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
))
3902 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
3906 btrfs_double_inode_lock(src
, inode
);
3911 /* determine range to clone */
3913 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
3916 olen
= len
= src
->i_size
- off
;
3917 /* if we extend to eof, continue to block boundary */
3918 if (off
+ len
== src
->i_size
)
3919 len
= ALIGN(src
->i_size
, bs
) - off
;
3926 /* verify the end result is block aligned */
3927 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
3928 !IS_ALIGNED(destoff
, bs
))
3931 /* verify if ranges are overlapped within the same file */
3933 if (destoff
+ len
> off
&& destoff
< off
+ len
)
3937 if (destoff
> inode
->i_size
) {
3938 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
3944 * Lock the target range too. Right after we replace the file extent
3945 * items in the fs tree (which now point to the cloned data), we might
3946 * have a worker replace them with extent items relative to a write
3947 * operation that was issued before this clone operation (i.e. confront
3948 * with inode.c:btrfs_finish_ordered_io).
3951 u64 lock_start
= min_t(u64
, off
, destoff
);
3952 u64 lock_len
= max_t(u64
, off
, destoff
) + len
- lock_start
;
3954 ret
= lock_extent_range(src
, lock_start
, lock_len
, true);
3956 ret
= btrfs_double_extent_lock(src
, off
, inode
, destoff
, len
,
3961 /* ranges in the io trees already unlocked */
3965 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
, 0);
3968 u64 lock_start
= min_t(u64
, off
, destoff
);
3969 u64 lock_end
= max_t(u64
, off
, destoff
) + len
- 1;
3971 unlock_extent(&BTRFS_I(src
)->io_tree
, lock_start
, lock_end
);
3973 btrfs_double_extent_unlock(src
, off
, inode
, destoff
, len
);
3976 * Truncate page cache pages so that future reads will see the cloned
3977 * data immediately and not the previous data.
3979 truncate_inode_pages_range(&inode
->i_data
,
3980 round_down(destoff
, PAGE_SIZE
),
3981 round_up(destoff
+ len
, PAGE_SIZE
) - 1);
3984 btrfs_double_inode_unlock(src
, inode
);
3990 int btrfs_clone_file_range(struct file
*src_file
, loff_t off
,
3991 struct file
*dst_file
, loff_t destoff
, u64 len
)
3993 return btrfs_clone_files(dst_file
, src_file
, off
, len
, destoff
);
3997 * there are many ways the trans_start and trans_end ioctls can lead
3998 * to deadlocks. They should only be used by applications that
3999 * basically own the machine, and have a very in depth understanding
4000 * of all the possible deadlocks and enospc problems.
4002 static long btrfs_ioctl_trans_start(struct file
*file
)
4004 struct inode
*inode
= file_inode(file
);
4005 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4006 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4007 struct btrfs_trans_handle
*trans
;
4011 if (!capable(CAP_SYS_ADMIN
))
4015 if (file
->private_data
)
4019 if (btrfs_root_readonly(root
))
4022 ret
= mnt_want_write_file(file
);
4026 atomic_inc(&fs_info
->open_ioctl_trans
);
4029 trans
= btrfs_start_ioctl_transaction(root
);
4033 file
->private_data
= trans
;
4037 atomic_dec(&fs_info
->open_ioctl_trans
);
4038 mnt_drop_write_file(file
);
4043 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
4045 struct inode
*inode
= file_inode(file
);
4046 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4047 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4048 struct btrfs_root
*new_root
;
4049 struct btrfs_dir_item
*di
;
4050 struct btrfs_trans_handle
*trans
;
4051 struct btrfs_path
*path
;
4052 struct btrfs_key location
;
4053 struct btrfs_disk_key disk_key
;
4058 if (!capable(CAP_SYS_ADMIN
))
4061 ret
= mnt_want_write_file(file
);
4065 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
4071 objectid
= BTRFS_FS_TREE_OBJECTID
;
4073 location
.objectid
= objectid
;
4074 location
.type
= BTRFS_ROOT_ITEM_KEY
;
4075 location
.offset
= (u64
)-1;
4077 new_root
= btrfs_read_fs_root_no_name(fs_info
, &location
);
4078 if (IS_ERR(new_root
)) {
4079 ret
= PTR_ERR(new_root
);
4083 path
= btrfs_alloc_path();
4088 path
->leave_spinning
= 1;
4090 trans
= btrfs_start_transaction(root
, 1);
4091 if (IS_ERR(trans
)) {
4092 btrfs_free_path(path
);
4093 ret
= PTR_ERR(trans
);
4097 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
4098 di
= btrfs_lookup_dir_item(trans
, fs_info
->tree_root
, path
,
4099 dir_id
, "default", 7, 1);
4100 if (IS_ERR_OR_NULL(di
)) {
4101 btrfs_free_path(path
);
4102 btrfs_end_transaction(trans
);
4104 "Umm, you don't have the default diritem, this isn't going to work");
4109 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
4110 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
4111 btrfs_mark_buffer_dirty(path
->nodes
[0]);
4112 btrfs_free_path(path
);
4114 btrfs_set_fs_incompat(fs_info
, DEFAULT_SUBVOL
);
4115 btrfs_end_transaction(trans
);
4117 mnt_drop_write_file(file
);
4121 void btrfs_get_block_group_info(struct list_head
*groups_list
,
4122 struct btrfs_ioctl_space_info
*space
)
4124 struct btrfs_block_group_cache
*block_group
;
4126 space
->total_bytes
= 0;
4127 space
->used_bytes
= 0;
4129 list_for_each_entry(block_group
, groups_list
, list
) {
4130 space
->flags
= block_group
->flags
;
4131 space
->total_bytes
+= block_group
->key
.offset
;
4132 space
->used_bytes
+=
4133 btrfs_block_group_used(&block_group
->item
);
4137 static long btrfs_ioctl_space_info(struct btrfs_fs_info
*fs_info
,
4140 struct btrfs_ioctl_space_args space_args
;
4141 struct btrfs_ioctl_space_info space
;
4142 struct btrfs_ioctl_space_info
*dest
;
4143 struct btrfs_ioctl_space_info
*dest_orig
;
4144 struct btrfs_ioctl_space_info __user
*user_dest
;
4145 struct btrfs_space_info
*info
;
4146 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
4147 BTRFS_BLOCK_GROUP_SYSTEM
,
4148 BTRFS_BLOCK_GROUP_METADATA
,
4149 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
4156 if (copy_from_user(&space_args
,
4157 (struct btrfs_ioctl_space_args __user
*)arg
,
4158 sizeof(space_args
)))
4161 for (i
= 0; i
< num_types
; i
++) {
4162 struct btrfs_space_info
*tmp
;
4166 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
,
4168 if (tmp
->flags
== types
[i
]) {
4178 down_read(&info
->groups_sem
);
4179 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
4180 if (!list_empty(&info
->block_groups
[c
]))
4183 up_read(&info
->groups_sem
);
4187 * Global block reserve, exported as a space_info
4191 /* space_slots == 0 means they are asking for a count */
4192 if (space_args
.space_slots
== 0) {
4193 space_args
.total_spaces
= slot_count
;
4197 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
4199 alloc_size
= sizeof(*dest
) * slot_count
;
4201 /* we generally have at most 6 or so space infos, one for each raid
4202 * level. So, a whole page should be more than enough for everyone
4204 if (alloc_size
> PAGE_SIZE
)
4207 space_args
.total_spaces
= 0;
4208 dest
= kmalloc(alloc_size
, GFP_KERNEL
);
4213 /* now we have a buffer to copy into */
4214 for (i
= 0; i
< num_types
; i
++) {
4215 struct btrfs_space_info
*tmp
;
4222 list_for_each_entry_rcu(tmp
, &fs_info
->space_info
,
4224 if (tmp
->flags
== types
[i
]) {
4233 down_read(&info
->groups_sem
);
4234 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
4235 if (!list_empty(&info
->block_groups
[c
])) {
4236 btrfs_get_block_group_info(
4237 &info
->block_groups
[c
], &space
);
4238 memcpy(dest
, &space
, sizeof(space
));
4240 space_args
.total_spaces
++;
4246 up_read(&info
->groups_sem
);
4250 * Add global block reserve
4253 struct btrfs_block_rsv
*block_rsv
= &fs_info
->global_block_rsv
;
4255 spin_lock(&block_rsv
->lock
);
4256 space
.total_bytes
= block_rsv
->size
;
4257 space
.used_bytes
= block_rsv
->size
- block_rsv
->reserved
;
4258 spin_unlock(&block_rsv
->lock
);
4259 space
.flags
= BTRFS_SPACE_INFO_GLOBAL_RSV
;
4260 memcpy(dest
, &space
, sizeof(space
));
4261 space_args
.total_spaces
++;
4264 user_dest
= (struct btrfs_ioctl_space_info __user
*)
4265 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
4267 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
4272 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
4279 * there are many ways the trans_start and trans_end ioctls can lead
4280 * to deadlocks. They should only be used by applications that
4281 * basically own the machine, and have a very in depth understanding
4282 * of all the possible deadlocks and enospc problems.
4284 long btrfs_ioctl_trans_end(struct file
*file
)
4286 struct inode
*inode
= file_inode(file
);
4287 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4288 struct btrfs_trans_handle
*trans
;
4290 trans
= file
->private_data
;
4293 file
->private_data
= NULL
;
4295 btrfs_end_transaction(trans
);
4297 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
4299 mnt_drop_write_file(file
);
4303 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
4306 struct btrfs_trans_handle
*trans
;
4310 trans
= btrfs_attach_transaction_barrier(root
);
4311 if (IS_ERR(trans
)) {
4312 if (PTR_ERR(trans
) != -ENOENT
)
4313 return PTR_ERR(trans
);
4315 /* No running transaction, don't bother */
4316 transid
= root
->fs_info
->last_trans_committed
;
4319 transid
= trans
->transid
;
4320 ret
= btrfs_commit_transaction_async(trans
, 0);
4322 btrfs_end_transaction(trans
);
4327 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
4332 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_fs_info
*fs_info
,
4338 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
4341 transid
= 0; /* current trans */
4343 return btrfs_wait_for_commit(fs_info
, transid
);
4346 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
4348 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
4349 struct btrfs_ioctl_scrub_args
*sa
;
4352 if (!capable(CAP_SYS_ADMIN
))
4355 sa
= memdup_user(arg
, sizeof(*sa
));
4359 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
4360 ret
= mnt_want_write_file(file
);
4365 ret
= btrfs_scrub_dev(fs_info
, sa
->devid
, sa
->start
, sa
->end
,
4366 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
4369 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4372 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
4373 mnt_drop_write_file(file
);
4379 static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info
*fs_info
)
4381 if (!capable(CAP_SYS_ADMIN
))
4384 return btrfs_scrub_cancel(fs_info
);
4387 static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info
*fs_info
,
4390 struct btrfs_ioctl_scrub_args
*sa
;
4393 if (!capable(CAP_SYS_ADMIN
))
4396 sa
= memdup_user(arg
, sizeof(*sa
));
4400 ret
= btrfs_scrub_progress(fs_info
, sa
->devid
, &sa
->progress
);
4402 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4409 static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info
*fs_info
,
4412 struct btrfs_ioctl_get_dev_stats
*sa
;
4415 sa
= memdup_user(arg
, sizeof(*sa
));
4419 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
4424 ret
= btrfs_get_dev_stats(fs_info
, sa
);
4426 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
4433 static long btrfs_ioctl_dev_replace(struct btrfs_fs_info
*fs_info
,
4436 struct btrfs_ioctl_dev_replace_args
*p
;
4439 if (!capable(CAP_SYS_ADMIN
))
4442 p
= memdup_user(arg
, sizeof(*p
));
4447 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
4448 if (fs_info
->sb
->s_flags
& MS_RDONLY
) {
4453 &fs_info
->mutually_exclusive_operation_running
, 1)) {
4454 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4456 ret
= btrfs_dev_replace_by_ioctl(fs_info
, p
);
4458 &fs_info
->mutually_exclusive_operation_running
, 0);
4461 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
4462 btrfs_dev_replace_status(fs_info
, p
);
4465 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
4466 ret
= btrfs_dev_replace_cancel(fs_info
, p
);
4473 if (copy_to_user(arg
, p
, sizeof(*p
)))
4480 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
4486 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
4487 struct inode_fs_paths
*ipath
= NULL
;
4488 struct btrfs_path
*path
;
4490 if (!capable(CAP_DAC_READ_SEARCH
))
4493 path
= btrfs_alloc_path();
4499 ipa
= memdup_user(arg
, sizeof(*ipa
));
4506 size
= min_t(u32
, ipa
->size
, 4096);
4507 ipath
= init_ipath(size
, root
, path
);
4508 if (IS_ERR(ipath
)) {
4509 ret
= PTR_ERR(ipath
);
4514 ret
= paths_from_inode(ipa
->inum
, ipath
);
4518 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
4519 rel_ptr
= ipath
->fspath
->val
[i
] -
4520 (u64
)(unsigned long)ipath
->fspath
->val
;
4521 ipath
->fspath
->val
[i
] = rel_ptr
;
4524 ret
= copy_to_user((void *)(unsigned long)ipa
->fspath
,
4525 (void *)(unsigned long)ipath
->fspath
, size
);
4532 btrfs_free_path(path
);
4539 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
4541 struct btrfs_data_container
*inodes
= ctx
;
4542 const size_t c
= 3 * sizeof(u64
);
4544 if (inodes
->bytes_left
>= c
) {
4545 inodes
->bytes_left
-= c
;
4546 inodes
->val
[inodes
->elem_cnt
] = inum
;
4547 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
4548 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
4549 inodes
->elem_cnt
+= 3;
4551 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
4552 inodes
->bytes_left
= 0;
4553 inodes
->elem_missed
+= 3;
4559 static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info
*fs_info
,
4564 struct btrfs_ioctl_logical_ino_args
*loi
;
4565 struct btrfs_data_container
*inodes
= NULL
;
4566 struct btrfs_path
*path
= NULL
;
4568 if (!capable(CAP_SYS_ADMIN
))
4571 loi
= memdup_user(arg
, sizeof(*loi
));
4573 return PTR_ERR(loi
);
4575 path
= btrfs_alloc_path();
4581 size
= min_t(u32
, loi
->size
, SZ_64K
);
4582 inodes
= init_data_container(size
);
4583 if (IS_ERR(inodes
)) {
4584 ret
= PTR_ERR(inodes
);
4589 ret
= iterate_inodes_from_logical(loi
->logical
, fs_info
, path
,
4590 build_ino_list
, inodes
);
4596 ret
= copy_to_user((void *)(unsigned long)loi
->inodes
,
4597 (void *)(unsigned long)inodes
, size
);
4602 btrfs_free_path(path
);
4609 void update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
, int lock
,
4610 struct btrfs_ioctl_balance_args
*bargs
)
4612 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
4614 bargs
->flags
= bctl
->flags
;
4616 if (atomic_read(&fs_info
->balance_running
))
4617 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
4618 if (atomic_read(&fs_info
->balance_pause_req
))
4619 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
4620 if (atomic_read(&fs_info
->balance_cancel_req
))
4621 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
4623 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
4624 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
4625 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
4628 spin_lock(&fs_info
->balance_lock
);
4629 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4630 spin_unlock(&fs_info
->balance_lock
);
4632 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
4636 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
4638 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4639 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4640 struct btrfs_ioctl_balance_args
*bargs
;
4641 struct btrfs_balance_control
*bctl
;
4642 bool need_unlock
; /* for mut. excl. ops lock */
4645 if (!capable(CAP_SYS_ADMIN
))
4648 ret
= mnt_want_write_file(file
);
4653 if (!atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
4654 mutex_lock(&fs_info
->volume_mutex
);
4655 mutex_lock(&fs_info
->balance_mutex
);
4661 * mut. excl. ops lock is locked. Three possibilities:
4662 * (1) some other op is running
4663 * (2) balance is running
4664 * (3) balance is paused -- special case (think resume)
4666 mutex_lock(&fs_info
->balance_mutex
);
4667 if (fs_info
->balance_ctl
) {
4668 /* this is either (2) or (3) */
4669 if (!atomic_read(&fs_info
->balance_running
)) {
4670 mutex_unlock(&fs_info
->balance_mutex
);
4671 if (!mutex_trylock(&fs_info
->volume_mutex
))
4673 mutex_lock(&fs_info
->balance_mutex
);
4675 if (fs_info
->balance_ctl
&&
4676 !atomic_read(&fs_info
->balance_running
)) {
4678 need_unlock
= false;
4682 mutex_unlock(&fs_info
->balance_mutex
);
4683 mutex_unlock(&fs_info
->volume_mutex
);
4687 mutex_unlock(&fs_info
->balance_mutex
);
4693 mutex_unlock(&fs_info
->balance_mutex
);
4694 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
4699 BUG_ON(!atomic_read(&fs_info
->mutually_exclusive_operation_running
));
4702 bargs
= memdup_user(arg
, sizeof(*bargs
));
4703 if (IS_ERR(bargs
)) {
4704 ret
= PTR_ERR(bargs
);
4708 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
4709 if (!fs_info
->balance_ctl
) {
4714 bctl
= fs_info
->balance_ctl
;
4715 spin_lock(&fs_info
->balance_lock
);
4716 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
4717 spin_unlock(&fs_info
->balance_lock
);
4725 if (fs_info
->balance_ctl
) {
4730 bctl
= kzalloc(sizeof(*bctl
), GFP_KERNEL
);
4736 bctl
->fs_info
= fs_info
;
4738 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4739 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4740 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4742 bctl
->flags
= bargs
->flags
;
4744 /* balance everything - no filters */
4745 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4748 if (bctl
->flags
& ~(BTRFS_BALANCE_ARGS_MASK
| BTRFS_BALANCE_TYPE_MASK
)) {
4755 * Ownership of bctl and mutually_exclusive_operation_running
4756 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4757 * or, if restriper was paused all the way until unmount, in
4758 * free_fs_info. mutually_exclusive_operation_running is
4759 * cleared in __cancel_balance.
4761 need_unlock
= false;
4763 ret
= btrfs_balance(bctl
, bargs
);
4767 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4776 mutex_unlock(&fs_info
->balance_mutex
);
4777 mutex_unlock(&fs_info
->volume_mutex
);
4779 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
4781 mnt_drop_write_file(file
);
4785 static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info
*fs_info
, int cmd
)
4787 if (!capable(CAP_SYS_ADMIN
))
4791 case BTRFS_BALANCE_CTL_PAUSE
:
4792 return btrfs_pause_balance(fs_info
);
4793 case BTRFS_BALANCE_CTL_CANCEL
:
4794 return btrfs_cancel_balance(fs_info
);
4800 static long btrfs_ioctl_balance_progress(struct btrfs_fs_info
*fs_info
,
4803 struct btrfs_ioctl_balance_args
*bargs
;
4806 if (!capable(CAP_SYS_ADMIN
))
4809 mutex_lock(&fs_info
->balance_mutex
);
4810 if (!fs_info
->balance_ctl
) {
4815 bargs
= kzalloc(sizeof(*bargs
), GFP_KERNEL
);
4821 update_ioctl_balance_args(fs_info
, 1, bargs
);
4823 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4828 mutex_unlock(&fs_info
->balance_mutex
);
4832 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4834 struct inode
*inode
= file_inode(file
);
4835 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4836 struct btrfs_ioctl_quota_ctl_args
*sa
;
4837 struct btrfs_trans_handle
*trans
= NULL
;
4841 if (!capable(CAP_SYS_ADMIN
))
4844 ret
= mnt_want_write_file(file
);
4848 sa
= memdup_user(arg
, sizeof(*sa
));
4854 down_write(&fs_info
->subvol_sem
);
4855 trans
= btrfs_start_transaction(fs_info
->tree_root
, 2);
4856 if (IS_ERR(trans
)) {
4857 ret
= PTR_ERR(trans
);
4862 case BTRFS_QUOTA_CTL_ENABLE
:
4863 ret
= btrfs_quota_enable(trans
, fs_info
);
4865 case BTRFS_QUOTA_CTL_DISABLE
:
4866 ret
= btrfs_quota_disable(trans
, fs_info
);
4873 err
= btrfs_commit_transaction(trans
);
4878 up_write(&fs_info
->subvol_sem
);
4880 mnt_drop_write_file(file
);
4884 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4886 struct inode
*inode
= file_inode(file
);
4887 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4888 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4889 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4890 struct btrfs_trans_handle
*trans
;
4894 if (!capable(CAP_SYS_ADMIN
))
4897 ret
= mnt_want_write_file(file
);
4901 sa
= memdup_user(arg
, sizeof(*sa
));
4907 trans
= btrfs_join_transaction(root
);
4908 if (IS_ERR(trans
)) {
4909 ret
= PTR_ERR(trans
);
4913 /* FIXME: check if the IDs really exist */
4915 ret
= btrfs_add_qgroup_relation(trans
, fs_info
,
4918 ret
= btrfs_del_qgroup_relation(trans
, fs_info
,
4922 /* update qgroup status and info */
4923 err
= btrfs_run_qgroups(trans
, fs_info
);
4925 btrfs_handle_fs_error(fs_info
, err
,
4926 "failed to update qgroup status and info");
4927 err
= btrfs_end_transaction(trans
);
4934 mnt_drop_write_file(file
);
4938 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4940 struct inode
*inode
= file_inode(file
);
4941 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4942 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4943 struct btrfs_ioctl_qgroup_create_args
*sa
;
4944 struct btrfs_trans_handle
*trans
;
4948 if (!capable(CAP_SYS_ADMIN
))
4951 ret
= mnt_want_write_file(file
);
4955 sa
= memdup_user(arg
, sizeof(*sa
));
4961 if (!sa
->qgroupid
) {
4966 trans
= btrfs_join_transaction(root
);
4967 if (IS_ERR(trans
)) {
4968 ret
= PTR_ERR(trans
);
4972 /* FIXME: check if the IDs really exist */
4974 ret
= btrfs_create_qgroup(trans
, fs_info
, sa
->qgroupid
);
4976 ret
= btrfs_remove_qgroup(trans
, fs_info
, sa
->qgroupid
);
4979 err
= btrfs_end_transaction(trans
);
4986 mnt_drop_write_file(file
);
4990 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4992 struct inode
*inode
= file_inode(file
);
4993 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4994 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4995 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4996 struct btrfs_trans_handle
*trans
;
5001 if (!capable(CAP_SYS_ADMIN
))
5004 ret
= mnt_want_write_file(file
);
5008 sa
= memdup_user(arg
, sizeof(*sa
));
5014 trans
= btrfs_join_transaction(root
);
5015 if (IS_ERR(trans
)) {
5016 ret
= PTR_ERR(trans
);
5020 qgroupid
= sa
->qgroupid
;
5022 /* take the current subvol as qgroup */
5023 qgroupid
= root
->root_key
.objectid
;
5026 /* FIXME: check if the IDs really exist */
5027 ret
= btrfs_limit_qgroup(trans
, fs_info
, qgroupid
, &sa
->lim
);
5029 err
= btrfs_end_transaction(trans
);
5036 mnt_drop_write_file(file
);
5040 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
5042 struct inode
*inode
= file_inode(file
);
5043 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5044 struct btrfs_ioctl_quota_rescan_args
*qsa
;
5047 if (!capable(CAP_SYS_ADMIN
))
5050 ret
= mnt_want_write_file(file
);
5054 qsa
= memdup_user(arg
, sizeof(*qsa
));
5065 ret
= btrfs_qgroup_rescan(fs_info
);
5070 mnt_drop_write_file(file
);
5074 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
5076 struct inode
*inode
= file_inode(file
);
5077 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5078 struct btrfs_ioctl_quota_rescan_args
*qsa
;
5081 if (!capable(CAP_SYS_ADMIN
))
5084 qsa
= kzalloc(sizeof(*qsa
), GFP_KERNEL
);
5088 if (fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
5090 qsa
->progress
= fs_info
->qgroup_rescan_progress
.objectid
;
5093 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
5100 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
5102 struct inode
*inode
= file_inode(file
);
5103 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5105 if (!capable(CAP_SYS_ADMIN
))
5108 return btrfs_qgroup_wait_for_completion(fs_info
, true);
5111 static long _btrfs_ioctl_set_received_subvol(struct file
*file
,
5112 struct btrfs_ioctl_received_subvol_args
*sa
)
5114 struct inode
*inode
= file_inode(file
);
5115 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5116 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5117 struct btrfs_root_item
*root_item
= &root
->root_item
;
5118 struct btrfs_trans_handle
*trans
;
5119 struct timespec ct
= current_time(inode
);
5121 int received_uuid_changed
;
5123 if (!inode_owner_or_capable(inode
))
5126 ret
= mnt_want_write_file(file
);
5130 down_write(&fs_info
->subvol_sem
);
5132 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
5137 if (btrfs_root_readonly(root
)) {
5144 * 2 - uuid items (received uuid + subvol uuid)
5146 trans
= btrfs_start_transaction(root
, 3);
5147 if (IS_ERR(trans
)) {
5148 ret
= PTR_ERR(trans
);
5153 sa
->rtransid
= trans
->transid
;
5154 sa
->rtime
.sec
= ct
.tv_sec
;
5155 sa
->rtime
.nsec
= ct
.tv_nsec
;
5157 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
5159 if (received_uuid_changed
&&
5160 !btrfs_is_empty_uuid(root_item
->received_uuid
))
5161 btrfs_uuid_tree_rem(trans
, fs_info
, root_item
->received_uuid
,
5162 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
5163 root
->root_key
.objectid
);
5164 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
5165 btrfs_set_root_stransid(root_item
, sa
->stransid
);
5166 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
5167 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
5168 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
5169 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
5170 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
5172 ret
= btrfs_update_root(trans
, fs_info
->tree_root
,
5173 &root
->root_key
, &root
->root_item
);
5175 btrfs_end_transaction(trans
);
5178 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
5179 ret
= btrfs_uuid_tree_add(trans
, fs_info
, sa
->uuid
,
5180 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
5181 root
->root_key
.objectid
);
5182 if (ret
< 0 && ret
!= -EEXIST
) {
5183 btrfs_abort_transaction(trans
, ret
);
5187 ret
= btrfs_commit_transaction(trans
);
5189 btrfs_abort_transaction(trans
, ret
);
5194 up_write(&fs_info
->subvol_sem
);
5195 mnt_drop_write_file(file
);
5200 static long btrfs_ioctl_set_received_subvol_32(struct file
*file
,
5203 struct btrfs_ioctl_received_subvol_args_32
*args32
= NULL
;
5204 struct btrfs_ioctl_received_subvol_args
*args64
= NULL
;
5207 args32
= memdup_user(arg
, sizeof(*args32
));
5209 return PTR_ERR(args32
);
5211 args64
= kmalloc(sizeof(*args64
), GFP_KERNEL
);
5217 memcpy(args64
->uuid
, args32
->uuid
, BTRFS_UUID_SIZE
);
5218 args64
->stransid
= args32
->stransid
;
5219 args64
->rtransid
= args32
->rtransid
;
5220 args64
->stime
.sec
= args32
->stime
.sec
;
5221 args64
->stime
.nsec
= args32
->stime
.nsec
;
5222 args64
->rtime
.sec
= args32
->rtime
.sec
;
5223 args64
->rtime
.nsec
= args32
->rtime
.nsec
;
5224 args64
->flags
= args32
->flags
;
5226 ret
= _btrfs_ioctl_set_received_subvol(file
, args64
);
5230 memcpy(args32
->uuid
, args64
->uuid
, BTRFS_UUID_SIZE
);
5231 args32
->stransid
= args64
->stransid
;
5232 args32
->rtransid
= args64
->rtransid
;
5233 args32
->stime
.sec
= args64
->stime
.sec
;
5234 args32
->stime
.nsec
= args64
->stime
.nsec
;
5235 args32
->rtime
.sec
= args64
->rtime
.sec
;
5236 args32
->rtime
.nsec
= args64
->rtime
.nsec
;
5237 args32
->flags
= args64
->flags
;
5239 ret
= copy_to_user(arg
, args32
, sizeof(*args32
));
5250 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
5253 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
5256 sa
= memdup_user(arg
, sizeof(*sa
));
5260 ret
= _btrfs_ioctl_set_received_subvol(file
, sa
);
5265 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
5274 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
5276 struct inode
*inode
= file_inode(file
);
5277 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5280 char label
[BTRFS_LABEL_SIZE
];
5282 spin_lock(&fs_info
->super_lock
);
5283 memcpy(label
, fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
5284 spin_unlock(&fs_info
->super_lock
);
5286 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
5288 if (len
== BTRFS_LABEL_SIZE
) {
5290 "label is too long, return the first %zu bytes",
5294 ret
= copy_to_user(arg
, label
, len
);
5296 return ret
? -EFAULT
: 0;
5299 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
5301 struct inode
*inode
= file_inode(file
);
5302 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5303 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5304 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
5305 struct btrfs_trans_handle
*trans
;
5306 char label
[BTRFS_LABEL_SIZE
];
5309 if (!capable(CAP_SYS_ADMIN
))
5312 if (copy_from_user(label
, arg
, sizeof(label
)))
5315 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
5317 "unable to set label with more than %d bytes",
5318 BTRFS_LABEL_SIZE
- 1);
5322 ret
= mnt_want_write_file(file
);
5326 trans
= btrfs_start_transaction(root
, 0);
5327 if (IS_ERR(trans
)) {
5328 ret
= PTR_ERR(trans
);
5332 spin_lock(&fs_info
->super_lock
);
5333 strcpy(super_block
->label
, label
);
5334 spin_unlock(&fs_info
->super_lock
);
5335 ret
= btrfs_commit_transaction(trans
);
5338 mnt_drop_write_file(file
);
5342 #define INIT_FEATURE_FLAGS(suffix) \
5343 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5344 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5345 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5347 int btrfs_ioctl_get_supported_features(void __user
*arg
)
5349 static const struct btrfs_ioctl_feature_flags features
[3] = {
5350 INIT_FEATURE_FLAGS(SUPP
),
5351 INIT_FEATURE_FLAGS(SAFE_SET
),
5352 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
5355 if (copy_to_user(arg
, &features
, sizeof(features
)))
5361 static int btrfs_ioctl_get_features(struct file
*file
, void __user
*arg
)
5363 struct inode
*inode
= file_inode(file
);
5364 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5365 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
5366 struct btrfs_ioctl_feature_flags features
;
5368 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
5369 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
5370 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
5372 if (copy_to_user(arg
, &features
, sizeof(features
)))
5378 static int check_feature_bits(struct btrfs_fs_info
*fs_info
,
5379 enum btrfs_feature_set set
,
5380 u64 change_mask
, u64 flags
, u64 supported_flags
,
5381 u64 safe_set
, u64 safe_clear
)
5383 const char *type
= btrfs_feature_set_names
[set
];
5385 u64 disallowed
, unsupported
;
5386 u64 set_mask
= flags
& change_mask
;
5387 u64 clear_mask
= ~flags
& change_mask
;
5389 unsupported
= set_mask
& ~supported_flags
;
5391 names
= btrfs_printable_features(set
, unsupported
);
5394 "this kernel does not support the %s feature bit%s",
5395 names
, strchr(names
, ',') ? "s" : "");
5399 "this kernel does not support %s bits 0x%llx",
5404 disallowed
= set_mask
& ~safe_set
;
5406 names
= btrfs_printable_features(set
, disallowed
);
5409 "can't set the %s feature bit%s while mounted",
5410 names
, strchr(names
, ',') ? "s" : "");
5414 "can't set %s bits 0x%llx while mounted",
5419 disallowed
= clear_mask
& ~safe_clear
;
5421 names
= btrfs_printable_features(set
, disallowed
);
5424 "can't clear the %s feature bit%s while mounted",
5425 names
, strchr(names
, ',') ? "s" : "");
5429 "can't clear %s bits 0x%llx while mounted",
5437 #define check_feature(fs_info, change_mask, flags, mask_base) \
5438 check_feature_bits(fs_info, FEAT_##mask_base, change_mask, flags, \
5439 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5440 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5441 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5443 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
5445 struct inode
*inode
= file_inode(file
);
5446 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5447 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5448 struct btrfs_super_block
*super_block
= fs_info
->super_copy
;
5449 struct btrfs_ioctl_feature_flags flags
[2];
5450 struct btrfs_trans_handle
*trans
;
5454 if (!capable(CAP_SYS_ADMIN
))
5457 if (copy_from_user(flags
, arg
, sizeof(flags
)))
5461 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
5462 !flags
[0].incompat_flags
)
5465 ret
= check_feature(fs_info
, flags
[0].compat_flags
,
5466 flags
[1].compat_flags
, COMPAT
);
5470 ret
= check_feature(fs_info
, flags
[0].compat_ro_flags
,
5471 flags
[1].compat_ro_flags
, COMPAT_RO
);
5475 ret
= check_feature(fs_info
, flags
[0].incompat_flags
,
5476 flags
[1].incompat_flags
, INCOMPAT
);
5480 ret
= mnt_want_write_file(file
);
5484 trans
= btrfs_start_transaction(root
, 0);
5485 if (IS_ERR(trans
)) {
5486 ret
= PTR_ERR(trans
);
5487 goto out_drop_write
;
5490 spin_lock(&fs_info
->super_lock
);
5491 newflags
= btrfs_super_compat_flags(super_block
);
5492 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
5493 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
5494 btrfs_set_super_compat_flags(super_block
, newflags
);
5496 newflags
= btrfs_super_compat_ro_flags(super_block
);
5497 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
5498 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
5499 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
5501 newflags
= btrfs_super_incompat_flags(super_block
);
5502 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
5503 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
5504 btrfs_set_super_incompat_flags(super_block
, newflags
);
5505 spin_unlock(&fs_info
->super_lock
);
5507 ret
= btrfs_commit_transaction(trans
);
5509 mnt_drop_write_file(file
);
5514 long btrfs_ioctl(struct file
*file
, unsigned int
5515 cmd
, unsigned long arg
)
5517 struct inode
*inode
= file_inode(file
);
5518 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5519 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5520 void __user
*argp
= (void __user
*)arg
;
5523 case FS_IOC_GETFLAGS
:
5524 return btrfs_ioctl_getflags(file
, argp
);
5525 case FS_IOC_SETFLAGS
:
5526 return btrfs_ioctl_setflags(file
, argp
);
5527 case FS_IOC_GETVERSION
:
5528 return btrfs_ioctl_getversion(file
, argp
);
5530 return btrfs_ioctl_fitrim(file
, argp
);
5531 case BTRFS_IOC_SNAP_CREATE
:
5532 return btrfs_ioctl_snap_create(file
, argp
, 0);
5533 case BTRFS_IOC_SNAP_CREATE_V2
:
5534 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
5535 case BTRFS_IOC_SUBVOL_CREATE
:
5536 return btrfs_ioctl_snap_create(file
, argp
, 1);
5537 case BTRFS_IOC_SUBVOL_CREATE_V2
:
5538 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
5539 case BTRFS_IOC_SNAP_DESTROY
:
5540 return btrfs_ioctl_snap_destroy(file
, argp
);
5541 case BTRFS_IOC_SUBVOL_GETFLAGS
:
5542 return btrfs_ioctl_subvol_getflags(file
, argp
);
5543 case BTRFS_IOC_SUBVOL_SETFLAGS
:
5544 return btrfs_ioctl_subvol_setflags(file
, argp
);
5545 case BTRFS_IOC_DEFAULT_SUBVOL
:
5546 return btrfs_ioctl_default_subvol(file
, argp
);
5547 case BTRFS_IOC_DEFRAG
:
5548 return btrfs_ioctl_defrag(file
, NULL
);
5549 case BTRFS_IOC_DEFRAG_RANGE
:
5550 return btrfs_ioctl_defrag(file
, argp
);
5551 case BTRFS_IOC_RESIZE
:
5552 return btrfs_ioctl_resize(file
, argp
);
5553 case BTRFS_IOC_ADD_DEV
:
5554 return btrfs_ioctl_add_dev(fs_info
, argp
);
5555 case BTRFS_IOC_RM_DEV
:
5556 return btrfs_ioctl_rm_dev(file
, argp
);
5557 case BTRFS_IOC_RM_DEV_V2
:
5558 return btrfs_ioctl_rm_dev_v2(file
, argp
);
5559 case BTRFS_IOC_FS_INFO
:
5560 return btrfs_ioctl_fs_info(fs_info
, argp
);
5561 case BTRFS_IOC_DEV_INFO
:
5562 return btrfs_ioctl_dev_info(fs_info
, argp
);
5563 case BTRFS_IOC_BALANCE
:
5564 return btrfs_ioctl_balance(file
, NULL
);
5565 case BTRFS_IOC_TRANS_START
:
5566 return btrfs_ioctl_trans_start(file
);
5567 case BTRFS_IOC_TRANS_END
:
5568 return btrfs_ioctl_trans_end(file
);
5569 case BTRFS_IOC_TREE_SEARCH
:
5570 return btrfs_ioctl_tree_search(file
, argp
);
5571 case BTRFS_IOC_TREE_SEARCH_V2
:
5572 return btrfs_ioctl_tree_search_v2(file
, argp
);
5573 case BTRFS_IOC_INO_LOOKUP
:
5574 return btrfs_ioctl_ino_lookup(file
, argp
);
5575 case BTRFS_IOC_INO_PATHS
:
5576 return btrfs_ioctl_ino_to_path(root
, argp
);
5577 case BTRFS_IOC_LOGICAL_INO
:
5578 return btrfs_ioctl_logical_to_ino(fs_info
, argp
);
5579 case BTRFS_IOC_SPACE_INFO
:
5580 return btrfs_ioctl_space_info(fs_info
, argp
);
5581 case BTRFS_IOC_SYNC
: {
5584 ret
= btrfs_start_delalloc_roots(fs_info
, 0, -1);
5587 ret
= btrfs_sync_fs(inode
->i_sb
, 1);
5589 * The transaction thread may want to do more work,
5590 * namely it pokes the cleaner kthread that will start
5591 * processing uncleaned subvols.
5593 wake_up_process(fs_info
->transaction_kthread
);
5596 case BTRFS_IOC_START_SYNC
:
5597 return btrfs_ioctl_start_sync(root
, argp
);
5598 case BTRFS_IOC_WAIT_SYNC
:
5599 return btrfs_ioctl_wait_sync(fs_info
, argp
);
5600 case BTRFS_IOC_SCRUB
:
5601 return btrfs_ioctl_scrub(file
, argp
);
5602 case BTRFS_IOC_SCRUB_CANCEL
:
5603 return btrfs_ioctl_scrub_cancel(fs_info
);
5604 case BTRFS_IOC_SCRUB_PROGRESS
:
5605 return btrfs_ioctl_scrub_progress(fs_info
, argp
);
5606 case BTRFS_IOC_BALANCE_V2
:
5607 return btrfs_ioctl_balance(file
, argp
);
5608 case BTRFS_IOC_BALANCE_CTL
:
5609 return btrfs_ioctl_balance_ctl(fs_info
, arg
);
5610 case BTRFS_IOC_BALANCE_PROGRESS
:
5611 return btrfs_ioctl_balance_progress(fs_info
, argp
);
5612 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
5613 return btrfs_ioctl_set_received_subvol(file
, argp
);
5615 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32
:
5616 return btrfs_ioctl_set_received_subvol_32(file
, argp
);
5618 case BTRFS_IOC_SEND
:
5619 return btrfs_ioctl_send(file
, argp
);
5620 case BTRFS_IOC_GET_DEV_STATS
:
5621 return btrfs_ioctl_get_dev_stats(fs_info
, argp
);
5622 case BTRFS_IOC_QUOTA_CTL
:
5623 return btrfs_ioctl_quota_ctl(file
, argp
);
5624 case BTRFS_IOC_QGROUP_ASSIGN
:
5625 return btrfs_ioctl_qgroup_assign(file
, argp
);
5626 case BTRFS_IOC_QGROUP_CREATE
:
5627 return btrfs_ioctl_qgroup_create(file
, argp
);
5628 case BTRFS_IOC_QGROUP_LIMIT
:
5629 return btrfs_ioctl_qgroup_limit(file
, argp
);
5630 case BTRFS_IOC_QUOTA_RESCAN
:
5631 return btrfs_ioctl_quota_rescan(file
, argp
);
5632 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
5633 return btrfs_ioctl_quota_rescan_status(file
, argp
);
5634 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
5635 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
5636 case BTRFS_IOC_DEV_REPLACE
:
5637 return btrfs_ioctl_dev_replace(fs_info
, argp
);
5638 case BTRFS_IOC_GET_FSLABEL
:
5639 return btrfs_ioctl_get_fslabel(file
, argp
);
5640 case BTRFS_IOC_SET_FSLABEL
:
5641 return btrfs_ioctl_set_fslabel(file
, argp
);
5642 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
5643 return btrfs_ioctl_get_supported_features(argp
);
5644 case BTRFS_IOC_GET_FEATURES
:
5645 return btrfs_ioctl_get_features(file
, argp
);
5646 case BTRFS_IOC_SET_FEATURES
:
5647 return btrfs_ioctl_set_features(file
, argp
);
5653 #ifdef CONFIG_COMPAT
5654 long btrfs_compat_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
)
5657 case FS_IOC32_GETFLAGS
:
5658 cmd
= FS_IOC_GETFLAGS
;
5660 case FS_IOC32_SETFLAGS
:
5661 cmd
= FS_IOC_SETFLAGS
;
5663 case FS_IOC32_GETVERSION
:
5664 cmd
= FS_IOC_GETVERSION
;
5667 return -ENOIOCTLCMD
;
5670 return btrfs_ioctl(file
, cmd
, (unsigned long) compat_ptr(arg
));