2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/fsnotify.h>
25 #include <linux/pagemap.h>
26 #include <linux/highmem.h>
27 #include <linux/time.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/backing-dev.h>
31 #include <linux/mount.h>
32 #include <linux/mpage.h>
33 #include <linux/namei.h>
34 #include <linux/swap.h>
35 #include <linux/writeback.h>
36 #include <linux/statfs.h>
37 #include <linux/compat.h>
38 #include <linux/bit_spinlock.h>
39 #include <linux/security.h>
40 #include <linux/xattr.h>
41 #include <linux/vmalloc.h>
42 #include <linux/slab.h>
43 #include <linux/blkdev.h>
44 #include <linux/uuid.h>
45 #include <linux/btrfs.h>
46 #include <linux/uaccess.h>
49 #include "transaction.h"
50 #include "btrfs_inode.h"
51 #include "print-tree.h"
54 #include "inode-map.h"
56 #include "rcu-string.h"
58 #include "dev-replace.h"
60 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
61 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
);
63 /* Mask out flags that are inappropriate for the given type of inode. */
64 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
68 else if (S_ISREG(mode
))
69 return flags
& ~FS_DIRSYNC_FL
;
71 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
75 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
77 static unsigned int btrfs_flags_to_ioctl(unsigned int flags
)
79 unsigned int iflags
= 0;
81 if (flags
& BTRFS_INODE_SYNC
)
83 if (flags
& BTRFS_INODE_IMMUTABLE
)
84 iflags
|= FS_IMMUTABLE_FL
;
85 if (flags
& BTRFS_INODE_APPEND
)
86 iflags
|= FS_APPEND_FL
;
87 if (flags
& BTRFS_INODE_NODUMP
)
88 iflags
|= FS_NODUMP_FL
;
89 if (flags
& BTRFS_INODE_NOATIME
)
90 iflags
|= FS_NOATIME_FL
;
91 if (flags
& BTRFS_INODE_DIRSYNC
)
92 iflags
|= FS_DIRSYNC_FL
;
93 if (flags
& BTRFS_INODE_NODATACOW
)
94 iflags
|= FS_NOCOW_FL
;
96 if ((flags
& BTRFS_INODE_COMPRESS
) && !(flags
& BTRFS_INODE_NOCOMPRESS
))
97 iflags
|= FS_COMPR_FL
;
98 else if (flags
& BTRFS_INODE_NOCOMPRESS
)
99 iflags
|= FS_NOCOMP_FL
;
105 * Update inode->i_flags based on the btrfs internal flags.
107 void btrfs_update_iflags(struct inode
*inode
)
109 struct btrfs_inode
*ip
= BTRFS_I(inode
);
111 inode
->i_flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
);
113 if (ip
->flags
& BTRFS_INODE_SYNC
)
114 inode
->i_flags
|= S_SYNC
;
115 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
116 inode
->i_flags
|= S_IMMUTABLE
;
117 if (ip
->flags
& BTRFS_INODE_APPEND
)
118 inode
->i_flags
|= S_APPEND
;
119 if (ip
->flags
& BTRFS_INODE_NOATIME
)
120 inode
->i_flags
|= S_NOATIME
;
121 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
122 inode
->i_flags
|= S_DIRSYNC
;
126 * Inherit flags from the parent inode.
128 * Currently only the compression flags and the cow flags are inherited.
130 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
137 flags
= BTRFS_I(dir
)->flags
;
139 if (flags
& BTRFS_INODE_NOCOMPRESS
) {
140 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_COMPRESS
;
141 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
142 } else if (flags
& BTRFS_INODE_COMPRESS
) {
143 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
144 BTRFS_I(inode
)->flags
|= BTRFS_INODE_COMPRESS
;
147 if (flags
& BTRFS_INODE_NODATACOW
) {
148 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
;
149 if (S_ISREG(inode
->i_mode
))
150 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
153 btrfs_update_iflags(inode
);
156 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
158 struct btrfs_inode
*ip
= BTRFS_I(file_inode(file
));
159 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
161 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
166 static int check_flags(unsigned int flags
)
168 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
169 FS_NOATIME_FL
| FS_NODUMP_FL
| \
170 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
171 FS_NOCOMP_FL
| FS_COMPR_FL
|
175 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
181 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
183 struct inode
*inode
= file_inode(file
);
184 struct btrfs_inode
*ip
= BTRFS_I(inode
);
185 struct btrfs_root
*root
= ip
->root
;
186 struct btrfs_trans_handle
*trans
;
187 unsigned int flags
, oldflags
;
190 unsigned int i_oldflags
;
193 if (btrfs_root_readonly(root
))
196 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
199 ret
= check_flags(flags
);
203 if (!inode_owner_or_capable(inode
))
206 ret
= mnt_want_write_file(file
);
210 mutex_lock(&inode
->i_mutex
);
212 ip_oldflags
= ip
->flags
;
213 i_oldflags
= inode
->i_flags
;
214 mode
= inode
->i_mode
;
216 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
217 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
218 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
219 if (!capable(CAP_LINUX_IMMUTABLE
)) {
225 if (flags
& FS_SYNC_FL
)
226 ip
->flags
|= BTRFS_INODE_SYNC
;
228 ip
->flags
&= ~BTRFS_INODE_SYNC
;
229 if (flags
& FS_IMMUTABLE_FL
)
230 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
232 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
233 if (flags
& FS_APPEND_FL
)
234 ip
->flags
|= BTRFS_INODE_APPEND
;
236 ip
->flags
&= ~BTRFS_INODE_APPEND
;
237 if (flags
& FS_NODUMP_FL
)
238 ip
->flags
|= BTRFS_INODE_NODUMP
;
240 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
241 if (flags
& FS_NOATIME_FL
)
242 ip
->flags
|= BTRFS_INODE_NOATIME
;
244 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
245 if (flags
& FS_DIRSYNC_FL
)
246 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
248 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
249 if (flags
& FS_NOCOW_FL
) {
252 * It's safe to turn csums off here, no extents exist.
253 * Otherwise we want the flag to reflect the real COW
254 * status of the file and will not set it.
256 if (inode
->i_size
== 0)
257 ip
->flags
|= BTRFS_INODE_NODATACOW
258 | BTRFS_INODE_NODATASUM
;
260 ip
->flags
|= BTRFS_INODE_NODATACOW
;
264 * Revert back under same assuptions as above
267 if (inode
->i_size
== 0)
268 ip
->flags
&= ~(BTRFS_INODE_NODATACOW
269 | BTRFS_INODE_NODATASUM
);
271 ip
->flags
&= ~BTRFS_INODE_NODATACOW
;
276 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
277 * flag may be changed automatically if compression code won't make
280 if (flags
& FS_NOCOMP_FL
) {
281 ip
->flags
&= ~BTRFS_INODE_COMPRESS
;
282 ip
->flags
|= BTRFS_INODE_NOCOMPRESS
;
283 } else if (flags
& FS_COMPR_FL
) {
284 ip
->flags
|= BTRFS_INODE_COMPRESS
;
285 ip
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
287 ip
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
290 trans
= btrfs_start_transaction(root
, 1);
292 ret
= PTR_ERR(trans
);
296 btrfs_update_iflags(inode
);
297 inode_inc_iversion(inode
);
298 inode
->i_ctime
= CURRENT_TIME
;
299 ret
= btrfs_update_inode(trans
, root
, inode
);
301 btrfs_end_transaction(trans
, root
);
304 ip
->flags
= ip_oldflags
;
305 inode
->i_flags
= i_oldflags
;
309 mutex_unlock(&inode
->i_mutex
);
310 mnt_drop_write_file(file
);
314 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
316 struct inode
*inode
= file_inode(file
);
318 return put_user(inode
->i_generation
, arg
);
321 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
323 struct btrfs_fs_info
*fs_info
= btrfs_sb(fdentry(file
)->d_sb
);
324 struct btrfs_device
*device
;
325 struct request_queue
*q
;
326 struct fstrim_range range
;
327 u64 minlen
= ULLONG_MAX
;
329 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
332 if (!capable(CAP_SYS_ADMIN
))
336 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
340 q
= bdev_get_queue(device
->bdev
);
341 if (blk_queue_discard(q
)) {
343 minlen
= min((u64
)q
->limits
.discard_granularity
,
351 if (copy_from_user(&range
, arg
, sizeof(range
)))
353 if (range
.start
> total_bytes
||
354 range
.len
< fs_info
->sb
->s_blocksize
)
357 range
.len
= min(range
.len
, total_bytes
- range
.start
);
358 range
.minlen
= max(range
.minlen
, minlen
);
359 ret
= btrfs_trim_fs(fs_info
->tree_root
, &range
);
363 if (copy_to_user(arg
, &range
, sizeof(range
)))
369 int btrfs_is_empty_uuid(u8
*uuid
)
371 BUILD_BUG_ON(BTRFS_UUID_SIZE
> PAGE_SIZE
);
372 return !memcmp(uuid
, empty_zero_page
, BTRFS_UUID_SIZE
);
375 static noinline
int create_subvol(struct inode
*dir
,
376 struct dentry
*dentry
,
377 char *name
, int namelen
,
379 struct btrfs_qgroup_inherit
*inherit
)
381 struct btrfs_trans_handle
*trans
;
382 struct btrfs_key key
;
383 struct btrfs_root_item root_item
;
384 struct btrfs_inode_item
*inode_item
;
385 struct extent_buffer
*leaf
;
386 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
387 struct btrfs_root
*new_root
;
388 struct btrfs_block_rsv block_rsv
;
389 struct timespec cur_time
= CURRENT_TIME
;
393 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
398 ret
= btrfs_find_free_objectid(root
->fs_info
->tree_root
, &objectid
);
402 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
404 * The same as the snapshot creation, please see the comment
405 * of create_snapshot().
407 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
408 8, &qgroup_reserved
, false);
412 trans
= btrfs_start_transaction(root
, 0);
414 ret
= PTR_ERR(trans
);
417 trans
->block_rsv
= &block_rsv
;
418 trans
->bytes_reserved
= block_rsv
.size
;
420 ret
= btrfs_qgroup_inherit(trans
, root
->fs_info
, 0, objectid
, inherit
);
424 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
425 0, objectid
, NULL
, 0, 0, 0);
431 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
432 btrfs_set_header_bytenr(leaf
, leaf
->start
);
433 btrfs_set_header_generation(leaf
, trans
->transid
);
434 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
435 btrfs_set_header_owner(leaf
, objectid
);
437 write_extent_buffer(leaf
, root
->fs_info
->fsid
, btrfs_header_fsid(),
439 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
440 btrfs_header_chunk_tree_uuid(leaf
),
442 btrfs_mark_buffer_dirty(leaf
);
444 memset(&root_item
, 0, sizeof(root_item
));
446 inode_item
= &root_item
.inode
;
447 btrfs_set_stack_inode_generation(inode_item
, 1);
448 btrfs_set_stack_inode_size(inode_item
, 3);
449 btrfs_set_stack_inode_nlink(inode_item
, 1);
450 btrfs_set_stack_inode_nbytes(inode_item
, root
->leafsize
);
451 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
453 btrfs_set_root_flags(&root_item
, 0);
454 btrfs_set_root_limit(&root_item
, 0);
455 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
457 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
458 btrfs_set_root_generation(&root_item
, trans
->transid
);
459 btrfs_set_root_level(&root_item
, 0);
460 btrfs_set_root_refs(&root_item
, 1);
461 btrfs_set_root_used(&root_item
, leaf
->len
);
462 btrfs_set_root_last_snapshot(&root_item
, 0);
464 btrfs_set_root_generation_v2(&root_item
,
465 btrfs_root_generation(&root_item
));
466 uuid_le_gen(&new_uuid
);
467 memcpy(root_item
.uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
468 btrfs_set_stack_timespec_sec(&root_item
.otime
, cur_time
.tv_sec
);
469 btrfs_set_stack_timespec_nsec(&root_item
.otime
, cur_time
.tv_nsec
);
470 root_item
.ctime
= root_item
.otime
;
471 btrfs_set_root_ctransid(&root_item
, trans
->transid
);
472 btrfs_set_root_otransid(&root_item
, trans
->transid
);
474 btrfs_tree_unlock(leaf
);
475 free_extent_buffer(leaf
);
478 btrfs_set_root_dirid(&root_item
, new_dirid
);
480 key
.objectid
= objectid
;
482 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
483 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
488 key
.offset
= (u64
)-1;
489 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
490 if (IS_ERR(new_root
)) {
491 btrfs_abort_transaction(trans
, root
, PTR_ERR(new_root
));
492 ret
= PTR_ERR(new_root
);
496 btrfs_record_root_in_trans(trans
, new_root
);
498 ret
= btrfs_create_subvol_root(trans
, new_root
, new_dirid
);
500 /* We potentially lose an unused inode item here */
501 btrfs_abort_transaction(trans
, root
, ret
);
506 * insert the directory item
508 ret
= btrfs_set_inode_index(dir
, &index
);
510 btrfs_abort_transaction(trans
, root
, ret
);
514 ret
= btrfs_insert_dir_item(trans
, root
,
515 name
, namelen
, dir
, &key
,
516 BTRFS_FT_DIR
, index
);
518 btrfs_abort_transaction(trans
, root
, ret
);
522 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
523 ret
= btrfs_update_inode(trans
, root
, dir
);
526 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
527 objectid
, root
->root_key
.objectid
,
528 btrfs_ino(dir
), index
, name
, namelen
);
531 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
532 root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
535 btrfs_abort_transaction(trans
, root
, ret
);
538 trans
->block_rsv
= NULL
;
539 trans
->bytes_reserved
= 0;
541 *async_transid
= trans
->transid
;
542 err
= btrfs_commit_transaction_async(trans
, root
, 1);
544 err
= btrfs_commit_transaction(trans
, root
);
546 err
= btrfs_commit_transaction(trans
, root
);
552 d_instantiate(dentry
, btrfs_lookup_dentry(dir
, dentry
));
554 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
558 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
559 struct dentry
*dentry
, char *name
, int namelen
,
560 u64
*async_transid
, bool readonly
,
561 struct btrfs_qgroup_inherit
*inherit
)
564 struct btrfs_pending_snapshot
*pending_snapshot
;
565 struct btrfs_trans_handle
*trans
;
571 ret
= btrfs_start_delalloc_inodes(root
, 0);
575 btrfs_wait_ordered_extents(root
);
577 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
578 if (!pending_snapshot
)
581 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
582 BTRFS_BLOCK_RSV_TEMP
);
584 * 1 - parent dir inode
587 * 2 - root ref/backref
588 * 1 - root of snapshot
591 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
592 &pending_snapshot
->block_rsv
, 8,
593 &pending_snapshot
->qgroup_reserved
,
598 pending_snapshot
->dentry
= dentry
;
599 pending_snapshot
->root
= root
;
600 pending_snapshot
->readonly
= readonly
;
601 pending_snapshot
->dir
= dir
;
602 pending_snapshot
->inherit
= inherit
;
604 trans
= btrfs_start_transaction(root
, 0);
606 ret
= PTR_ERR(trans
);
610 spin_lock(&root
->fs_info
->trans_lock
);
611 list_add(&pending_snapshot
->list
,
612 &trans
->transaction
->pending_snapshots
);
613 spin_unlock(&root
->fs_info
->trans_lock
);
615 *async_transid
= trans
->transid
;
616 ret
= btrfs_commit_transaction_async(trans
,
617 root
->fs_info
->extent_root
, 1);
619 ret
= btrfs_commit_transaction(trans
, root
);
621 ret
= btrfs_commit_transaction(trans
,
622 root
->fs_info
->extent_root
);
627 ret
= pending_snapshot
->error
;
631 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
635 inode
= btrfs_lookup_dentry(dentry
->d_parent
->d_inode
, dentry
);
637 ret
= PTR_ERR(inode
);
641 d_instantiate(dentry
, inode
);
644 btrfs_subvolume_release_metadata(BTRFS_I(dir
)->root
,
645 &pending_snapshot
->block_rsv
,
646 pending_snapshot
->qgroup_reserved
);
648 kfree(pending_snapshot
);
652 /* copy of check_sticky in fs/namei.c()
653 * It's inline, so penalty for filesystems that don't use sticky bit is
656 static inline int btrfs_check_sticky(struct inode
*dir
, struct inode
*inode
)
658 kuid_t fsuid
= current_fsuid();
660 if (!(dir
->i_mode
& S_ISVTX
))
662 if (uid_eq(inode
->i_uid
, fsuid
))
664 if (uid_eq(dir
->i_uid
, fsuid
))
666 return !capable(CAP_FOWNER
);
669 /* copy of may_delete in fs/namei.c()
670 * Check whether we can remove a link victim from directory dir, check
671 * whether the type of victim is right.
672 * 1. We can't do it if dir is read-only (done in permission())
673 * 2. We should have write and exec permissions on dir
674 * 3. We can't remove anything from append-only dir
675 * 4. We can't do anything with immutable dir (done in permission())
676 * 5. If the sticky bit on dir is set we should either
677 * a. be owner of dir, or
678 * b. be owner of victim, or
679 * c. have CAP_FOWNER capability
680 * 6. If the victim is append-only or immutable we can't do antyhing with
681 * links pointing to it.
682 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
683 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
684 * 9. We can't remove a root or mountpoint.
685 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
686 * nfs_async_unlink().
689 static int btrfs_may_delete(struct inode
*dir
,struct dentry
*victim
,int isdir
)
693 if (!victim
->d_inode
)
696 BUG_ON(victim
->d_parent
->d_inode
!= dir
);
697 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
699 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
704 if (btrfs_check_sticky(dir
, victim
->d_inode
)||
705 IS_APPEND(victim
->d_inode
)||
706 IS_IMMUTABLE(victim
->d_inode
) || IS_SWAPFILE(victim
->d_inode
))
709 if (!S_ISDIR(victim
->d_inode
->i_mode
))
713 } else if (S_ISDIR(victim
->d_inode
->i_mode
))
717 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
722 /* copy of may_create in fs/namei.c() */
723 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
729 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
733 * Create a new subvolume below @parent. This is largely modeled after
734 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
735 * inside this filesystem so it's quite a bit simpler.
737 static noinline
int btrfs_mksubvol(struct path
*parent
,
738 char *name
, int namelen
,
739 struct btrfs_root
*snap_src
,
740 u64
*async_transid
, bool readonly
,
741 struct btrfs_qgroup_inherit
*inherit
)
743 struct inode
*dir
= parent
->dentry
->d_inode
;
744 struct dentry
*dentry
;
747 error
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
751 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
752 error
= PTR_ERR(dentry
);
760 error
= btrfs_may_create(dir
, dentry
);
765 * even if this name doesn't exist, we may get hash collisions.
766 * check for them now when we can safely fail
768 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
774 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
776 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
780 error
= create_snapshot(snap_src
, dir
, dentry
, name
, namelen
,
781 async_transid
, readonly
, inherit
);
783 error
= create_subvol(dir
, dentry
, name
, namelen
,
784 async_transid
, inherit
);
787 fsnotify_mkdir(dir
, dentry
);
789 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
793 mutex_unlock(&dir
->i_mutex
);
798 * When we're defragging a range, we don't want to kick it off again
799 * if it is really just waiting for delalloc to send it down.
800 * If we find a nice big extent or delalloc range for the bytes in the
801 * file you want to defrag, we return 0 to let you know to skip this
804 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, int thresh
)
806 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
807 struct extent_map
*em
= NULL
;
808 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
811 read_lock(&em_tree
->lock
);
812 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_CACHE_SIZE
);
813 read_unlock(&em_tree
->lock
);
816 end
= extent_map_end(em
);
818 if (end
- offset
> thresh
)
821 /* if we already have a nice delalloc here, just stop */
823 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
824 thresh
, EXTENT_DELALLOC
, 1);
831 * helper function to walk through a file and find extents
832 * newer than a specific transid, and smaller than thresh.
834 * This is used by the defragging code to find new and small
837 static int find_new_extents(struct btrfs_root
*root
,
838 struct inode
*inode
, u64 newer_than
,
839 u64
*off
, int thresh
)
841 struct btrfs_path
*path
;
842 struct btrfs_key min_key
;
843 struct extent_buffer
*leaf
;
844 struct btrfs_file_extent_item
*extent
;
847 u64 ino
= btrfs_ino(inode
);
849 path
= btrfs_alloc_path();
853 min_key
.objectid
= ino
;
854 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
855 min_key
.offset
= *off
;
857 path
->keep_locks
= 1;
860 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
863 if (min_key
.objectid
!= ino
)
865 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
868 leaf
= path
->nodes
[0];
869 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
870 struct btrfs_file_extent_item
);
872 type
= btrfs_file_extent_type(leaf
, extent
);
873 if (type
== BTRFS_FILE_EXTENT_REG
&&
874 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
875 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
876 *off
= min_key
.offset
;
877 btrfs_free_path(path
);
881 if (min_key
.offset
== (u64
)-1)
885 btrfs_release_path(path
);
888 btrfs_free_path(path
);
892 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
894 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
895 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
896 struct extent_map
*em
;
897 u64 len
= PAGE_CACHE_SIZE
;
900 * hopefully we have this extent in the tree already, try without
901 * the full extent lock
903 read_lock(&em_tree
->lock
);
904 em
= lookup_extent_mapping(em_tree
, start
, len
);
905 read_unlock(&em_tree
->lock
);
908 /* get the big lock and read metadata off disk */
909 lock_extent(io_tree
, start
, start
+ len
- 1);
910 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
911 unlock_extent(io_tree
, start
, start
+ len
- 1);
920 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
922 struct extent_map
*next
;
925 /* this is the last extent */
926 if (em
->start
+ em
->len
>= i_size_read(inode
))
929 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
930 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
933 free_extent_map(next
);
937 static int should_defrag_range(struct inode
*inode
, u64 start
, int thresh
,
938 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
941 struct extent_map
*em
;
943 bool next_mergeable
= true;
946 * make sure that once we start defragging an extent, we keep on
949 if (start
< *defrag_end
)
954 em
= defrag_lookup_extent(inode
, start
);
958 /* this will cover holes, and inline extents */
959 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
964 next_mergeable
= defrag_check_next_extent(inode
, em
);
967 * we hit a real extent, if it is big or the next extent is not a
968 * real extent, don't bother defragging it
970 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
971 (em
->len
>= thresh
|| !next_mergeable
))
975 * last_len ends up being a counter of how many bytes we've defragged.
976 * every time we choose not to defrag an extent, we reset *last_len
977 * so that the next tiny extent will force a defrag.
979 * The end result of this is that tiny extents before a single big
980 * extent will force at least part of that big extent to be defragged.
983 *defrag_end
= extent_map_end(em
);
986 *skip
= extent_map_end(em
);
995 * it doesn't do much good to defrag one or two pages
996 * at a time. This pulls in a nice chunk of pages
999 * It also makes sure the delalloc code has enough
1000 * dirty data to avoid making new small extents as part
1003 * It's a good idea to start RA on this range
1004 * before calling this.
1006 static int cluster_pages_for_defrag(struct inode
*inode
,
1007 struct page
**pages
,
1008 unsigned long start_index
,
1011 unsigned long file_end
;
1012 u64 isize
= i_size_read(inode
);
1019 struct btrfs_ordered_extent
*ordered
;
1020 struct extent_state
*cached_state
= NULL
;
1021 struct extent_io_tree
*tree
;
1022 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1024 file_end
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1025 if (!isize
|| start_index
> file_end
)
1028 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1030 ret
= btrfs_delalloc_reserve_space(inode
,
1031 page_cnt
<< PAGE_CACHE_SHIFT
);
1035 tree
= &BTRFS_I(inode
)->io_tree
;
1037 /* step one, lock all the pages */
1038 for (i
= 0; i
< page_cnt
; i
++) {
1041 page
= find_or_create_page(inode
->i_mapping
,
1042 start_index
+ i
, mask
);
1046 page_start
= page_offset(page
);
1047 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1049 lock_extent(tree
, page_start
, page_end
);
1050 ordered
= btrfs_lookup_ordered_extent(inode
,
1052 unlock_extent(tree
, page_start
, page_end
);
1057 btrfs_start_ordered_extent(inode
, ordered
, 1);
1058 btrfs_put_ordered_extent(ordered
);
1061 * we unlocked the page above, so we need check if
1062 * it was released or not.
1064 if (page
->mapping
!= inode
->i_mapping
) {
1066 page_cache_release(page
);
1071 if (!PageUptodate(page
)) {
1072 btrfs_readpage(NULL
, page
);
1074 if (!PageUptodate(page
)) {
1076 page_cache_release(page
);
1082 if (page
->mapping
!= inode
->i_mapping
) {
1084 page_cache_release(page
);
1094 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1098 * so now we have a nice long stream of locked
1099 * and up to date pages, lets wait on them
1101 for (i
= 0; i
< i_done
; i
++)
1102 wait_on_page_writeback(pages
[i
]);
1104 page_start
= page_offset(pages
[0]);
1105 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_CACHE_SIZE
;
1107 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1108 page_start
, page_end
- 1, 0, &cached_state
);
1109 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1110 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1111 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1112 &cached_state
, GFP_NOFS
);
1114 if (i_done
!= page_cnt
) {
1115 spin_lock(&BTRFS_I(inode
)->lock
);
1116 BTRFS_I(inode
)->outstanding_extents
++;
1117 spin_unlock(&BTRFS_I(inode
)->lock
);
1118 btrfs_delalloc_release_space(inode
,
1119 (page_cnt
- i_done
) << PAGE_CACHE_SHIFT
);
1123 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1124 &cached_state
, GFP_NOFS
);
1126 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1127 page_start
, page_end
- 1, &cached_state
,
1130 for (i
= 0; i
< i_done
; i
++) {
1131 clear_page_dirty_for_io(pages
[i
]);
1132 ClearPageChecked(pages
[i
]);
1133 set_page_extent_mapped(pages
[i
]);
1134 set_page_dirty(pages
[i
]);
1135 unlock_page(pages
[i
]);
1136 page_cache_release(pages
[i
]);
1140 for (i
= 0; i
< i_done
; i
++) {
1141 unlock_page(pages
[i
]);
1142 page_cache_release(pages
[i
]);
1144 btrfs_delalloc_release_space(inode
, page_cnt
<< PAGE_CACHE_SHIFT
);
1149 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1150 struct btrfs_ioctl_defrag_range_args
*range
,
1151 u64 newer_than
, unsigned long max_to_defrag
)
1153 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1154 struct file_ra_state
*ra
= NULL
;
1155 unsigned long last_index
;
1156 u64 isize
= i_size_read(inode
);
1160 u64 newer_off
= range
->start
;
1162 unsigned long ra_index
= 0;
1164 int defrag_count
= 0;
1165 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1166 int extent_thresh
= range
->extent_thresh
;
1167 int max_cluster
= (256 * 1024) >> PAGE_CACHE_SHIFT
;
1168 int cluster
= max_cluster
;
1169 u64 new_align
= ~((u64
)128 * 1024 - 1);
1170 struct page
**pages
= NULL
;
1175 if (range
->start
>= isize
)
1178 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1179 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1181 if (range
->compress_type
)
1182 compress_type
= range
->compress_type
;
1185 if (extent_thresh
== 0)
1186 extent_thresh
= 256 * 1024;
1189 * if we were not given a file, allocate a readahead
1193 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
1196 file_ra_state_init(ra
, inode
->i_mapping
);
1201 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*),
1208 /* find the last page to defrag */
1209 if (range
->start
+ range
->len
> range
->start
) {
1210 last_index
= min_t(u64
, isize
- 1,
1211 range
->start
+ range
->len
- 1) >> PAGE_CACHE_SHIFT
;
1213 last_index
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1217 ret
= find_new_extents(root
, inode
, newer_than
,
1218 &newer_off
, 64 * 1024);
1220 range
->start
= newer_off
;
1222 * we always align our defrag to help keep
1223 * the extents in the file evenly spaced
1225 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1229 i
= range
->start
>> PAGE_CACHE_SHIFT
;
1232 max_to_defrag
= last_index
+ 1;
1235 * make writeback starts from i, so the defrag range can be
1236 * written sequentially.
1238 if (i
< inode
->i_mapping
->writeback_index
)
1239 inode
->i_mapping
->writeback_index
= i
;
1241 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1242 (i
< (i_size_read(inode
) + PAGE_CACHE_SIZE
- 1) >>
1243 PAGE_CACHE_SHIFT
)) {
1245 * make sure we stop running if someone unmounts
1248 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1251 if (btrfs_defrag_cancelled(root
->fs_info
)) {
1252 printk(KERN_DEBUG
"btrfs: defrag_file cancelled\n");
1257 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_CACHE_SHIFT
,
1258 extent_thresh
, &last_len
, &skip
,
1259 &defrag_end
, range
->flags
&
1260 BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1263 * the should_defrag function tells us how much to skip
1264 * bump our counter by the suggested amount
1266 next
= (skip
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
1267 i
= max(i
+ 1, next
);
1272 cluster
= (PAGE_CACHE_ALIGN(defrag_end
) >>
1273 PAGE_CACHE_SHIFT
) - i
;
1274 cluster
= min(cluster
, max_cluster
);
1276 cluster
= max_cluster
;
1279 if (i
+ cluster
> ra_index
) {
1280 ra_index
= max(i
, ra_index
);
1281 btrfs_force_ra(inode
->i_mapping
, ra
, file
, ra_index
,
1283 ra_index
+= max_cluster
;
1286 mutex_lock(&inode
->i_mutex
);
1287 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
1288 BTRFS_I(inode
)->force_compress
= compress_type
;
1289 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1291 mutex_unlock(&inode
->i_mutex
);
1295 defrag_count
+= ret
;
1296 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1297 mutex_unlock(&inode
->i_mutex
);
1300 if (newer_off
== (u64
)-1)
1306 newer_off
= max(newer_off
+ 1,
1307 (u64
)i
<< PAGE_CACHE_SHIFT
);
1309 ret
= find_new_extents(root
, inode
,
1310 newer_than
, &newer_off
,
1313 range
->start
= newer_off
;
1314 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1321 last_len
+= ret
<< PAGE_CACHE_SHIFT
;
1329 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
))
1330 filemap_flush(inode
->i_mapping
);
1332 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1333 /* the filemap_flush will queue IO into the worker threads, but
1334 * we have to make sure the IO is actually started and that
1335 * ordered extents get created before we return
1337 atomic_inc(&root
->fs_info
->async_submit_draining
);
1338 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
1339 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1340 wait_event(root
->fs_info
->async_submit_wait
,
1341 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
1342 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
1344 atomic_dec(&root
->fs_info
->async_submit_draining
);
1347 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1348 btrfs_set_fs_incompat(root
->fs_info
, COMPRESS_LZO
);
1354 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1355 mutex_lock(&inode
->i_mutex
);
1356 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
1357 mutex_unlock(&inode
->i_mutex
);
1365 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1371 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
1372 struct btrfs_ioctl_vol_args
*vol_args
;
1373 struct btrfs_trans_handle
*trans
;
1374 struct btrfs_device
*device
= NULL
;
1376 char *devstr
= NULL
;
1380 if (!capable(CAP_SYS_ADMIN
))
1383 ret
= mnt_want_write_file(file
);
1387 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
1389 mnt_drop_write_file(file
);
1390 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1393 mutex_lock(&root
->fs_info
->volume_mutex
);
1394 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1395 if (IS_ERR(vol_args
)) {
1396 ret
= PTR_ERR(vol_args
);
1400 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1402 sizestr
= vol_args
->name
;
1403 devstr
= strchr(sizestr
, ':');
1406 sizestr
= devstr
+ 1;
1408 devstr
= vol_args
->name
;
1409 devid
= simple_strtoull(devstr
, &end
, 10);
1414 printk(KERN_INFO
"btrfs: resizing devid %llu\n", devid
);
1417 device
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
1419 printk(KERN_INFO
"btrfs: resizer unable to find device %llu\n",
1425 if (!device
->writeable
) {
1426 printk(KERN_INFO
"btrfs: resizer unable to apply on "
1427 "readonly device %llu\n",
1433 if (!strcmp(sizestr
, "max"))
1434 new_size
= device
->bdev
->bd_inode
->i_size
;
1436 if (sizestr
[0] == '-') {
1439 } else if (sizestr
[0] == '+') {
1443 new_size
= memparse(sizestr
, NULL
);
1444 if (new_size
== 0) {
1450 if (device
->is_tgtdev_for_dev_replace
) {
1455 old_size
= device
->total_bytes
;
1458 if (new_size
> old_size
) {
1462 new_size
= old_size
- new_size
;
1463 } else if (mod
> 0) {
1464 new_size
= old_size
+ new_size
;
1467 if (new_size
< 256 * 1024 * 1024) {
1471 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1476 do_div(new_size
, root
->sectorsize
);
1477 new_size
*= root
->sectorsize
;
1479 printk_in_rcu(KERN_INFO
"btrfs: new size for %s is %llu\n",
1480 rcu_str_deref(device
->name
), new_size
);
1482 if (new_size
> old_size
) {
1483 trans
= btrfs_start_transaction(root
, 0);
1484 if (IS_ERR(trans
)) {
1485 ret
= PTR_ERR(trans
);
1488 ret
= btrfs_grow_device(trans
, device
, new_size
);
1489 btrfs_commit_transaction(trans
, root
);
1490 } else if (new_size
< old_size
) {
1491 ret
= btrfs_shrink_device(device
, new_size
);
1492 } /* equal, nothing need to do */
1497 mutex_unlock(&root
->fs_info
->volume_mutex
);
1498 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
1499 mnt_drop_write_file(file
);
1503 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1504 char *name
, unsigned long fd
, int subvol
,
1505 u64
*transid
, bool readonly
,
1506 struct btrfs_qgroup_inherit
*inherit
)
1511 ret
= mnt_want_write_file(file
);
1515 namelen
= strlen(name
);
1516 if (strchr(name
, '/')) {
1518 goto out_drop_write
;
1521 if (name
[0] == '.' &&
1522 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1524 goto out_drop_write
;
1528 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1529 NULL
, transid
, readonly
, inherit
);
1531 struct fd src
= fdget(fd
);
1532 struct inode
*src_inode
;
1535 goto out_drop_write
;
1538 src_inode
= file_inode(src
.file
);
1539 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1540 printk(KERN_INFO
"btrfs: Snapshot src from "
1544 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1545 BTRFS_I(src_inode
)->root
,
1546 transid
, readonly
, inherit
);
1551 mnt_drop_write_file(file
);
1556 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1557 void __user
*arg
, int subvol
)
1559 struct btrfs_ioctl_vol_args
*vol_args
;
1562 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1563 if (IS_ERR(vol_args
))
1564 return PTR_ERR(vol_args
);
1565 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1567 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1568 vol_args
->fd
, subvol
,
1575 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1576 void __user
*arg
, int subvol
)
1578 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1582 bool readonly
= false;
1583 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1585 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1586 if (IS_ERR(vol_args
))
1587 return PTR_ERR(vol_args
);
1588 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1590 if (vol_args
->flags
&
1591 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1592 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1597 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1599 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1601 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1602 if (vol_args
->size
> PAGE_CACHE_SIZE
) {
1606 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1607 if (IS_ERR(inherit
)) {
1608 ret
= PTR_ERR(inherit
);
1613 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1614 vol_args
->fd
, subvol
, ptr
,
1617 if (ret
== 0 && ptr
&&
1619 offsetof(struct btrfs_ioctl_vol_args_v2
,
1620 transid
), ptr
, sizeof(*ptr
)))
1628 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1631 struct inode
*inode
= file_inode(file
);
1632 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1636 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
)
1639 down_read(&root
->fs_info
->subvol_sem
);
1640 if (btrfs_root_readonly(root
))
1641 flags
|= BTRFS_SUBVOL_RDONLY
;
1642 up_read(&root
->fs_info
->subvol_sem
);
1644 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1650 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1653 struct inode
*inode
= file_inode(file
);
1654 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1655 struct btrfs_trans_handle
*trans
;
1660 ret
= mnt_want_write_file(file
);
1664 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
1666 goto out_drop_write
;
1669 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1671 goto out_drop_write
;
1674 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1676 goto out_drop_write
;
1679 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1681 goto out_drop_write
;
1684 if (!inode_owner_or_capable(inode
)) {
1686 goto out_drop_write
;
1689 down_write(&root
->fs_info
->subvol_sem
);
1692 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1695 root_flags
= btrfs_root_flags(&root
->root_item
);
1696 if (flags
& BTRFS_SUBVOL_RDONLY
)
1697 btrfs_set_root_flags(&root
->root_item
,
1698 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1700 btrfs_set_root_flags(&root
->root_item
,
1701 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1703 trans
= btrfs_start_transaction(root
, 1);
1704 if (IS_ERR(trans
)) {
1705 ret
= PTR_ERR(trans
);
1709 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
1710 &root
->root_key
, &root
->root_item
);
1712 btrfs_commit_transaction(trans
, root
);
1715 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1717 up_write(&root
->fs_info
->subvol_sem
);
1719 mnt_drop_write_file(file
);
1725 * helper to check if the subvolume references other subvolumes
1727 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1729 struct btrfs_path
*path
;
1730 struct btrfs_dir_item
*di
;
1731 struct btrfs_key key
;
1735 path
= btrfs_alloc_path();
1739 /* Make sure this root isn't set as the default subvol */
1740 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
1741 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
, path
,
1742 dir_id
, "default", 7, 0);
1743 if (di
&& !IS_ERR(di
)) {
1744 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
1745 if (key
.objectid
== root
->root_key
.objectid
) {
1749 btrfs_release_path(path
);
1752 key
.objectid
= root
->root_key
.objectid
;
1753 key
.type
= BTRFS_ROOT_REF_KEY
;
1754 key
.offset
= (u64
)-1;
1756 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
1763 if (path
->slots
[0] > 0) {
1765 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1766 if (key
.objectid
== root
->root_key
.objectid
&&
1767 key
.type
== BTRFS_ROOT_REF_KEY
)
1771 btrfs_free_path(path
);
1775 static noinline
int key_in_sk(struct btrfs_key
*key
,
1776 struct btrfs_ioctl_search_key
*sk
)
1778 struct btrfs_key test
;
1781 test
.objectid
= sk
->min_objectid
;
1782 test
.type
= sk
->min_type
;
1783 test
.offset
= sk
->min_offset
;
1785 ret
= btrfs_comp_cpu_keys(key
, &test
);
1789 test
.objectid
= sk
->max_objectid
;
1790 test
.type
= sk
->max_type
;
1791 test
.offset
= sk
->max_offset
;
1793 ret
= btrfs_comp_cpu_keys(key
, &test
);
1799 static noinline
int copy_to_sk(struct btrfs_root
*root
,
1800 struct btrfs_path
*path
,
1801 struct btrfs_key
*key
,
1802 struct btrfs_ioctl_search_key
*sk
,
1804 unsigned long *sk_offset
,
1808 struct extent_buffer
*leaf
;
1809 struct btrfs_ioctl_search_header sh
;
1810 unsigned long item_off
;
1811 unsigned long item_len
;
1817 leaf
= path
->nodes
[0];
1818 slot
= path
->slots
[0];
1819 nritems
= btrfs_header_nritems(leaf
);
1821 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1825 found_transid
= btrfs_header_generation(leaf
);
1827 for (i
= slot
; i
< nritems
; i
++) {
1828 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1829 item_len
= btrfs_item_size_nr(leaf
, i
);
1831 btrfs_item_key_to_cpu(leaf
, key
, i
);
1832 if (!key_in_sk(key
, sk
))
1835 if (sizeof(sh
) + item_len
> BTRFS_SEARCH_ARGS_BUFSIZE
)
1838 if (sizeof(sh
) + item_len
+ *sk_offset
>
1839 BTRFS_SEARCH_ARGS_BUFSIZE
) {
1844 sh
.objectid
= key
->objectid
;
1845 sh
.offset
= key
->offset
;
1846 sh
.type
= key
->type
;
1848 sh
.transid
= found_transid
;
1850 /* copy search result header */
1851 memcpy(buf
+ *sk_offset
, &sh
, sizeof(sh
));
1852 *sk_offset
+= sizeof(sh
);
1855 char *p
= buf
+ *sk_offset
;
1857 read_extent_buffer(leaf
, p
,
1858 item_off
, item_len
);
1859 *sk_offset
+= item_len
;
1863 if (*num_found
>= sk
->nr_items
)
1868 if (key
->offset
< (u64
)-1 && key
->offset
< sk
->max_offset
)
1870 else if (key
->type
< (u8
)-1 && key
->type
< sk
->max_type
) {
1873 } else if (key
->objectid
< (u64
)-1 && key
->objectid
< sk
->max_objectid
) {
1883 static noinline
int search_ioctl(struct inode
*inode
,
1884 struct btrfs_ioctl_search_args
*args
)
1886 struct btrfs_root
*root
;
1887 struct btrfs_key key
;
1888 struct btrfs_path
*path
;
1889 struct btrfs_ioctl_search_key
*sk
= &args
->key
;
1890 struct btrfs_fs_info
*info
= BTRFS_I(inode
)->root
->fs_info
;
1893 unsigned long sk_offset
= 0;
1895 path
= btrfs_alloc_path();
1899 if (sk
->tree_id
== 0) {
1900 /* search the root of the inode that was passed */
1901 root
= BTRFS_I(inode
)->root
;
1903 key
.objectid
= sk
->tree_id
;
1904 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1905 key
.offset
= (u64
)-1;
1906 root
= btrfs_read_fs_root_no_name(info
, &key
);
1908 printk(KERN_ERR
"could not find root %llu\n",
1910 btrfs_free_path(path
);
1915 key
.objectid
= sk
->min_objectid
;
1916 key
.type
= sk
->min_type
;
1917 key
.offset
= sk
->min_offset
;
1919 path
->keep_locks
= 1;
1922 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
1928 ret
= copy_to_sk(root
, path
, &key
, sk
, args
->buf
,
1929 &sk_offset
, &num_found
);
1930 btrfs_release_path(path
);
1931 if (ret
|| num_found
>= sk
->nr_items
)
1937 sk
->nr_items
= num_found
;
1938 btrfs_free_path(path
);
1942 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
1945 struct btrfs_ioctl_search_args
*args
;
1946 struct inode
*inode
;
1949 if (!capable(CAP_SYS_ADMIN
))
1952 args
= memdup_user(argp
, sizeof(*args
));
1954 return PTR_ERR(args
);
1956 inode
= file_inode(file
);
1957 ret
= search_ioctl(inode
, args
);
1958 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
1965 * Search INODE_REFs to identify path name of 'dirid' directory
1966 * in a 'tree_id' tree. and sets path name to 'name'.
1968 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
1969 u64 tree_id
, u64 dirid
, char *name
)
1971 struct btrfs_root
*root
;
1972 struct btrfs_key key
;
1978 struct btrfs_inode_ref
*iref
;
1979 struct extent_buffer
*l
;
1980 struct btrfs_path
*path
;
1982 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
1987 path
= btrfs_alloc_path();
1991 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
1993 key
.objectid
= tree_id
;
1994 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1995 key
.offset
= (u64
)-1;
1996 root
= btrfs_read_fs_root_no_name(info
, &key
);
1998 printk(KERN_ERR
"could not find root %llu\n", tree_id
);
2003 key
.objectid
= dirid
;
2004 key
.type
= BTRFS_INODE_REF_KEY
;
2005 key
.offset
= (u64
)-1;
2008 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2012 ret
= btrfs_previous_item(root
, path
, dirid
,
2013 BTRFS_INODE_REF_KEY
);
2023 slot
= path
->slots
[0];
2024 btrfs_item_key_to_cpu(l
, &key
, slot
);
2026 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2027 len
= btrfs_inode_ref_name_len(l
, iref
);
2029 total_len
+= len
+ 1;
2031 ret
= -ENAMETOOLONG
;
2036 read_extent_buffer(l
, ptr
,(unsigned long)(iref
+ 1), len
);
2038 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2041 btrfs_release_path(path
);
2042 key
.objectid
= key
.offset
;
2043 key
.offset
= (u64
)-1;
2044 dirid
= key
.objectid
;
2046 memmove(name
, ptr
, total_len
);
2047 name
[total_len
]='\0';
2050 btrfs_free_path(path
);
2054 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2057 struct btrfs_ioctl_ino_lookup_args
*args
;
2058 struct inode
*inode
;
2061 if (!capable(CAP_SYS_ADMIN
))
2064 args
= memdup_user(argp
, sizeof(*args
));
2066 return PTR_ERR(args
);
2068 inode
= file_inode(file
);
2070 if (args
->treeid
== 0)
2071 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2073 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2074 args
->treeid
, args
->objectid
,
2077 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2084 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2087 struct dentry
*parent
= fdentry(file
);
2088 struct dentry
*dentry
;
2089 struct inode
*dir
= parent
->d_inode
;
2090 struct inode
*inode
;
2091 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2092 struct btrfs_root
*dest
= NULL
;
2093 struct btrfs_ioctl_vol_args
*vol_args
;
2094 struct btrfs_trans_handle
*trans
;
2095 struct btrfs_block_rsv block_rsv
;
2096 u64 qgroup_reserved
;
2101 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2102 if (IS_ERR(vol_args
))
2103 return PTR_ERR(vol_args
);
2105 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2106 namelen
= strlen(vol_args
->name
);
2107 if (strchr(vol_args
->name
, '/') ||
2108 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2113 err
= mnt_want_write_file(file
);
2117 err
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
2120 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2121 if (IS_ERR(dentry
)) {
2122 err
= PTR_ERR(dentry
);
2123 goto out_unlock_dir
;
2126 if (!dentry
->d_inode
) {
2131 inode
= dentry
->d_inode
;
2132 dest
= BTRFS_I(inode
)->root
;
2133 if (!capable(CAP_SYS_ADMIN
)){
2135 * Regular user. Only allow this with a special mount
2136 * option, when the user has write+exec access to the
2137 * subvol root, and when rmdir(2) would have been
2140 * Note that this is _not_ check that the subvol is
2141 * empty or doesn't contain data that we wouldn't
2142 * otherwise be able to delete.
2144 * Users who want to delete empty subvols should try
2148 if (!btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
2152 * Do not allow deletion if the parent dir is the same
2153 * as the dir to be deleted. That means the ioctl
2154 * must be called on the dentry referencing the root
2155 * of the subvol, not a random directory contained
2162 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2167 /* check if subvolume may be deleted by a user */
2168 err
= btrfs_may_delete(dir
, dentry
, 1);
2172 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
2177 mutex_lock(&inode
->i_mutex
);
2178 err
= d_invalidate(dentry
);
2182 down_write(&root
->fs_info
->subvol_sem
);
2184 err
= may_destroy_subvol(dest
);
2188 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
2190 * One for dir inode, two for dir entries, two for root
2193 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
2194 5, &qgroup_reserved
, true);
2198 trans
= btrfs_start_transaction(root
, 0);
2199 if (IS_ERR(trans
)) {
2200 err
= PTR_ERR(trans
);
2203 trans
->block_rsv
= &block_rsv
;
2204 trans
->bytes_reserved
= block_rsv
.size
;
2206 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
2207 dest
->root_key
.objectid
,
2208 dentry
->d_name
.name
,
2209 dentry
->d_name
.len
);
2212 btrfs_abort_transaction(trans
, root
, ret
);
2216 btrfs_record_root_in_trans(trans
, dest
);
2218 memset(&dest
->root_item
.drop_progress
, 0,
2219 sizeof(dest
->root_item
.drop_progress
));
2220 dest
->root_item
.drop_level
= 0;
2221 btrfs_set_root_refs(&dest
->root_item
, 0);
2223 if (!xchg(&dest
->orphan_item_inserted
, 1)) {
2224 ret
= btrfs_insert_orphan_item(trans
,
2225 root
->fs_info
->tree_root
,
2226 dest
->root_key
.objectid
);
2228 btrfs_abort_transaction(trans
, root
, ret
);
2234 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2235 dest
->root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
2236 dest
->root_key
.objectid
);
2237 if (ret
&& ret
!= -ENOENT
) {
2238 btrfs_abort_transaction(trans
, root
, ret
);
2242 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
2243 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2244 dest
->root_item
.received_uuid
,
2245 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
2246 dest
->root_key
.objectid
);
2247 if (ret
&& ret
!= -ENOENT
) {
2248 btrfs_abort_transaction(trans
, root
, ret
);
2255 trans
->block_rsv
= NULL
;
2256 trans
->bytes_reserved
= 0;
2257 ret
= btrfs_end_transaction(trans
, root
);
2260 inode
->i_flags
|= S_DEAD
;
2262 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
2264 up_write(&root
->fs_info
->subvol_sem
);
2266 mutex_unlock(&inode
->i_mutex
);
2268 shrink_dcache_sb(root
->fs_info
->sb
);
2269 btrfs_invalidate_inodes(dest
);
2273 if (dest
->cache_inode
) {
2274 iput(dest
->cache_inode
);
2275 dest
->cache_inode
= NULL
;
2281 mutex_unlock(&dir
->i_mutex
);
2282 mnt_drop_write_file(file
);
2288 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2290 struct inode
*inode
= file_inode(file
);
2291 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2292 struct btrfs_ioctl_defrag_range_args
*range
;
2295 ret
= mnt_want_write_file(file
);
2299 if (btrfs_root_readonly(root
)) {
2304 switch (inode
->i_mode
& S_IFMT
) {
2306 if (!capable(CAP_SYS_ADMIN
)) {
2310 ret
= btrfs_defrag_root(root
);
2313 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
);
2316 if (!(file
->f_mode
& FMODE_WRITE
)) {
2321 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2328 if (copy_from_user(range
, argp
,
2334 /* compression requires us to start the IO */
2335 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2336 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2337 range
->extent_thresh
= (u32
)-1;
2340 /* the rest are all set to zero by kzalloc */
2341 range
->len
= (u64
)-1;
2343 ret
= btrfs_defrag_file(file_inode(file
), file
,
2353 mnt_drop_write_file(file
);
2357 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
2359 struct btrfs_ioctl_vol_args
*vol_args
;
2362 if (!capable(CAP_SYS_ADMIN
))
2365 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2367 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2370 mutex_lock(&root
->fs_info
->volume_mutex
);
2371 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2372 if (IS_ERR(vol_args
)) {
2373 ret
= PTR_ERR(vol_args
);
2377 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2378 ret
= btrfs_init_new_device(root
, vol_args
->name
);
2382 mutex_unlock(&root
->fs_info
->volume_mutex
);
2383 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2387 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
2389 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
2390 struct btrfs_ioctl_vol_args
*vol_args
;
2393 if (!capable(CAP_SYS_ADMIN
))
2396 ret
= mnt_want_write_file(file
);
2400 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2401 if (IS_ERR(vol_args
)) {
2402 ret
= PTR_ERR(vol_args
);
2406 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2408 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2410 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2414 mutex_lock(&root
->fs_info
->volume_mutex
);
2415 ret
= btrfs_rm_device(root
, vol_args
->name
);
2416 mutex_unlock(&root
->fs_info
->volume_mutex
);
2417 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2421 mnt_drop_write_file(file
);
2425 static long btrfs_ioctl_fs_info(struct btrfs_root
*root
, void __user
*arg
)
2427 struct btrfs_ioctl_fs_info_args
*fi_args
;
2428 struct btrfs_device
*device
;
2429 struct btrfs_device
*next
;
2430 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2433 if (!capable(CAP_SYS_ADMIN
))
2436 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
2440 mutex_lock(&fs_devices
->device_list_mutex
);
2441 fi_args
->num_devices
= fs_devices
->num_devices
;
2442 memcpy(&fi_args
->fsid
, root
->fs_info
->fsid
, sizeof(fi_args
->fsid
));
2444 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
2445 if (device
->devid
> fi_args
->max_id
)
2446 fi_args
->max_id
= device
->devid
;
2448 mutex_unlock(&fs_devices
->device_list_mutex
);
2450 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
2457 static long btrfs_ioctl_dev_info(struct btrfs_root
*root
, void __user
*arg
)
2459 struct btrfs_ioctl_dev_info_args
*di_args
;
2460 struct btrfs_device
*dev
;
2461 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2463 char *s_uuid
= NULL
;
2465 if (!capable(CAP_SYS_ADMIN
))
2468 di_args
= memdup_user(arg
, sizeof(*di_args
));
2469 if (IS_ERR(di_args
))
2470 return PTR_ERR(di_args
);
2472 if (!btrfs_is_empty_uuid(di_args
->uuid
))
2473 s_uuid
= di_args
->uuid
;
2475 mutex_lock(&fs_devices
->device_list_mutex
);
2476 dev
= btrfs_find_device(root
->fs_info
, di_args
->devid
, s_uuid
, NULL
);
2483 di_args
->devid
= dev
->devid
;
2484 di_args
->bytes_used
= dev
->bytes_used
;
2485 di_args
->total_bytes
= dev
->total_bytes
;
2486 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
2488 struct rcu_string
*name
;
2491 name
= rcu_dereference(dev
->name
);
2492 strncpy(di_args
->path
, name
->str
, sizeof(di_args
->path
));
2494 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
2496 di_args
->path
[0] = '\0';
2500 mutex_unlock(&fs_devices
->device_list_mutex
);
2501 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
2508 static struct page
*extent_same_get_page(struct inode
*inode
, u64 off
)
2512 struct extent_io_tree
*tree
= &BTRFS_I(inode
)->io_tree
;
2514 index
= off
>> PAGE_CACHE_SHIFT
;
2516 page
= grab_cache_page(inode
->i_mapping
, index
);
2520 if (!PageUptodate(page
)) {
2521 if (extent_read_full_page_nolock(tree
, page
, btrfs_get_extent
,
2525 if (!PageUptodate(page
)) {
2527 page_cache_release(page
);
2536 static inline void lock_extent_range(struct inode
*inode
, u64 off
, u64 len
)
2538 /* do any pending delalloc/csum calc on src, one way or
2539 another, and lock file content */
2541 struct btrfs_ordered_extent
*ordered
;
2542 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2543 ordered
= btrfs_lookup_first_ordered_extent(inode
,
2546 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
2547 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
))
2549 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2551 btrfs_put_ordered_extent(ordered
);
2552 btrfs_wait_ordered_range(inode
, off
, len
);
2556 static void btrfs_double_unlock(struct inode
*inode1
, u64 loff1
,
2557 struct inode
*inode2
, u64 loff2
, u64 len
)
2559 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
2560 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
2562 mutex_unlock(&inode1
->i_mutex
);
2563 mutex_unlock(&inode2
->i_mutex
);
2566 static void btrfs_double_lock(struct inode
*inode1
, u64 loff1
,
2567 struct inode
*inode2
, u64 loff2
, u64 len
)
2569 if (inode1
< inode2
) {
2570 swap(inode1
, inode2
);
2574 mutex_lock_nested(&inode1
->i_mutex
, I_MUTEX_PARENT
);
2575 lock_extent_range(inode1
, loff1
, len
);
2576 if (inode1
!= inode2
) {
2577 mutex_lock_nested(&inode2
->i_mutex
, I_MUTEX_CHILD
);
2578 lock_extent_range(inode2
, loff2
, len
);
2582 static int btrfs_cmp_data(struct inode
*src
, u64 loff
, struct inode
*dst
,
2583 u64 dst_loff
, u64 len
)
2586 struct page
*src_page
, *dst_page
;
2587 unsigned int cmp_len
= PAGE_CACHE_SIZE
;
2588 void *addr
, *dst_addr
;
2591 if (len
< PAGE_CACHE_SIZE
)
2594 src_page
= extent_same_get_page(src
, loff
);
2597 dst_page
= extent_same_get_page(dst
, dst_loff
);
2599 page_cache_release(src_page
);
2602 addr
= kmap_atomic(src_page
);
2603 dst_addr
= kmap_atomic(dst_page
);
2605 flush_dcache_page(src_page
);
2606 flush_dcache_page(dst_page
);
2608 if (memcmp(addr
, dst_addr
, cmp_len
))
2609 ret
= BTRFS_SAME_DATA_DIFFERS
;
2611 kunmap_atomic(addr
);
2612 kunmap_atomic(dst_addr
);
2613 page_cache_release(src_page
);
2614 page_cache_release(dst_page
);
2620 dst_loff
+= cmp_len
;
2627 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64 len
)
2629 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
2631 if (off
+ len
> inode
->i_size
|| off
+ len
< off
)
2633 /* Check that we are block aligned - btrfs_clone() requires this */
2634 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
2640 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 len
,
2641 struct inode
*dst
, u64 dst_loff
)
2646 * btrfs_clone() can't handle extents in the same file
2647 * yet. Once that works, we can drop this check and replace it
2648 * with a check for the same inode, but overlapping extents.
2653 btrfs_double_lock(src
, loff
, dst
, dst_loff
, len
);
2655 ret
= extent_same_check_offsets(src
, loff
, len
);
2659 ret
= extent_same_check_offsets(dst
, dst_loff
, len
);
2663 /* don't make the dst file partly checksummed */
2664 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
2665 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
2670 ret
= btrfs_cmp_data(src
, loff
, dst
, dst_loff
, len
);
2672 ret
= btrfs_clone(src
, dst
, loff
, len
, len
, dst_loff
);
2675 btrfs_double_unlock(src
, loff
, dst
, dst_loff
, len
);
2680 #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2682 static long btrfs_ioctl_file_extent_same(struct file
*file
,
2685 struct btrfs_ioctl_same_args tmp
;
2686 struct btrfs_ioctl_same_args
*same
;
2687 struct btrfs_ioctl_same_extent_info
*info
;
2688 struct inode
*src
= file
->f_dentry
->d_inode
;
2689 struct file
*dst_file
= NULL
;
2696 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
2697 bool is_admin
= capable(CAP_SYS_ADMIN
);
2699 if (!(file
->f_mode
& FMODE_READ
))
2702 ret
= mnt_want_write_file(file
);
2706 if (copy_from_user(&tmp
,
2707 (struct btrfs_ioctl_same_args __user
*)argp
,
2713 size
= sizeof(tmp
) +
2714 tmp
.dest_count
* sizeof(struct btrfs_ioctl_same_extent_info
);
2716 same
= memdup_user((struct btrfs_ioctl_same_args __user
*)argp
, size
);
2719 ret
= PTR_ERR(same
);
2723 off
= same
->logical_offset
;
2727 * Limit the total length we will dedupe for each operation.
2728 * This is intended to bound the total time spent in this
2729 * ioctl to something sane.
2731 if (len
> BTRFS_MAX_DEDUPE_LEN
)
2732 len
= BTRFS_MAX_DEDUPE_LEN
;
2734 if (WARN_ON_ONCE(bs
< PAGE_CACHE_SIZE
)) {
2736 * Btrfs does not support blocksize < page_size. As a
2737 * result, btrfs_cmp_data() won't correctly handle
2738 * this situation without an update.
2745 if (S_ISDIR(src
->i_mode
))
2749 if (!S_ISREG(src
->i_mode
))
2752 /* pre-format output fields to sane values */
2753 for (i
= 0; i
< same
->dest_count
; i
++) {
2754 same
->info
[i
].bytes_deduped
= 0ULL;
2755 same
->info
[i
].status
= 0;
2759 for (i
= 0; i
< same
->dest_count
; i
++) {
2760 info
= &same
->info
[i
];
2762 dst_file
= fget(info
->fd
);
2764 info
->status
= -EBADF
;
2768 if (!(is_admin
|| (dst_file
->f_mode
& FMODE_WRITE
))) {
2769 info
->status
= -EINVAL
;
2773 info
->status
= -EXDEV
;
2774 if (file
->f_path
.mnt
!= dst_file
->f_path
.mnt
)
2777 dst
= dst_file
->f_dentry
->d_inode
;
2778 if (src
->i_sb
!= dst
->i_sb
)
2781 if (S_ISDIR(dst
->i_mode
)) {
2782 info
->status
= -EISDIR
;
2786 if (!S_ISREG(dst
->i_mode
)) {
2787 info
->status
= -EACCES
;
2791 info
->status
= btrfs_extent_same(src
, off
, len
, dst
,
2792 info
->logical_offset
);
2793 if (info
->status
== 0)
2794 info
->bytes_deduped
+= len
;
2801 ret
= copy_to_user(argp
, same
, size
);
2806 mnt_drop_write_file(file
);
2811 * btrfs_clone() - clone a range from inode file to another
2813 * @src: Inode to clone from
2814 * @inode: Inode to clone to
2815 * @off: Offset within source to start clone from
2816 * @olen: Original length, passed by user, of range to clone
2817 * @olen_aligned: Block-aligned value of olen, extent_same uses
2818 * identical values here
2819 * @destoff: Offset within @inode to start clone
2821 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
2822 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
)
2824 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2825 struct btrfs_path
*path
= NULL
;
2826 struct extent_buffer
*leaf
;
2827 struct btrfs_trans_handle
*trans
;
2829 struct btrfs_key key
;
2833 u64 len
= olen_aligned
;
2836 buf
= vmalloc(btrfs_level_size(root
, 0));
2840 path
= btrfs_alloc_path();
2848 key
.objectid
= btrfs_ino(src
);
2849 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2854 * note the key will change type as we walk through the
2857 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
2862 nritems
= btrfs_header_nritems(path
->nodes
[0]);
2863 if (path
->slots
[0] >= nritems
) {
2864 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
2869 nritems
= btrfs_header_nritems(path
->nodes
[0]);
2871 leaf
= path
->nodes
[0];
2872 slot
= path
->slots
[0];
2874 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2875 if (btrfs_key_type(&key
) > BTRFS_EXTENT_DATA_KEY
||
2876 key
.objectid
!= btrfs_ino(src
))
2879 if (btrfs_key_type(&key
) == BTRFS_EXTENT_DATA_KEY
) {
2880 struct btrfs_file_extent_item
*extent
;
2883 struct btrfs_key new_key
;
2884 u64 disko
= 0, diskl
= 0;
2885 u64 datao
= 0, datal
= 0;
2889 size
= btrfs_item_size_nr(leaf
, slot
);
2890 read_extent_buffer(leaf
, buf
,
2891 btrfs_item_ptr_offset(leaf
, slot
),
2894 extent
= btrfs_item_ptr(leaf
, slot
,
2895 struct btrfs_file_extent_item
);
2896 comp
= btrfs_file_extent_compression(leaf
, extent
);
2897 type
= btrfs_file_extent_type(leaf
, extent
);
2898 if (type
== BTRFS_FILE_EXTENT_REG
||
2899 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
2900 disko
= btrfs_file_extent_disk_bytenr(leaf
,
2902 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
2904 datao
= btrfs_file_extent_offset(leaf
, extent
);
2905 datal
= btrfs_file_extent_num_bytes(leaf
,
2907 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
2908 /* take upper bound, may be compressed */
2909 datal
= btrfs_file_extent_ram_bytes(leaf
,
2912 btrfs_release_path(path
);
2914 if (key
.offset
+ datal
<= off
||
2915 key
.offset
>= off
+ len
- 1)
2918 memcpy(&new_key
, &key
, sizeof(new_key
));
2919 new_key
.objectid
= btrfs_ino(inode
);
2920 if (off
<= key
.offset
)
2921 new_key
.offset
= key
.offset
+ destoff
- off
;
2923 new_key
.offset
= destoff
;
2926 * 1 - adjusting old extent (we may have to split it)
2927 * 1 - add new extent
2930 trans
= btrfs_start_transaction(root
, 3);
2931 if (IS_ERR(trans
)) {
2932 ret
= PTR_ERR(trans
);
2936 if (type
== BTRFS_FILE_EXTENT_REG
||
2937 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
2939 * a | --- range to clone ---| b
2940 * | ------------- extent ------------- |
2943 /* substract range b */
2944 if (key
.offset
+ datal
> off
+ len
)
2945 datal
= off
+ len
- key
.offset
;
2947 /* substract range a */
2948 if (off
> key
.offset
) {
2949 datao
+= off
- key
.offset
;
2950 datal
-= off
- key
.offset
;
2953 ret
= btrfs_drop_extents(trans
, root
, inode
,
2955 new_key
.offset
+ datal
,
2958 btrfs_abort_transaction(trans
, root
,
2960 btrfs_end_transaction(trans
, root
);
2964 ret
= btrfs_insert_empty_item(trans
, root
, path
,
2967 btrfs_abort_transaction(trans
, root
,
2969 btrfs_end_transaction(trans
, root
);
2973 leaf
= path
->nodes
[0];
2974 slot
= path
->slots
[0];
2975 write_extent_buffer(leaf
, buf
,
2976 btrfs_item_ptr_offset(leaf
, slot
),
2979 extent
= btrfs_item_ptr(leaf
, slot
,
2980 struct btrfs_file_extent_item
);
2982 /* disko == 0 means it's a hole */
2986 btrfs_set_file_extent_offset(leaf
, extent
,
2988 btrfs_set_file_extent_num_bytes(leaf
, extent
,
2991 inode_add_bytes(inode
, datal
);
2992 ret
= btrfs_inc_extent_ref(trans
, root
,
2994 root
->root_key
.objectid
,
2996 new_key
.offset
- datao
,
2999 btrfs_abort_transaction(trans
,
3002 btrfs_end_transaction(trans
,
3008 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3011 if (off
> key
.offset
) {
3012 skip
= off
- key
.offset
;
3013 new_key
.offset
+= skip
;
3016 if (key
.offset
+ datal
> off
+ len
)
3017 trim
= key
.offset
+ datal
- (off
+ len
);
3019 if (comp
&& (skip
|| trim
)) {
3021 btrfs_end_transaction(trans
, root
);
3024 size
-= skip
+ trim
;
3025 datal
-= skip
+ trim
;
3027 ret
= btrfs_drop_extents(trans
, root
, inode
,
3029 new_key
.offset
+ datal
,
3032 btrfs_abort_transaction(trans
, root
,
3034 btrfs_end_transaction(trans
, root
);
3038 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3041 btrfs_abort_transaction(trans
, root
,
3043 btrfs_end_transaction(trans
, root
);
3049 btrfs_file_extent_calc_inline_size(0);
3050 memmove(buf
+start
, buf
+start
+skip
,
3054 leaf
= path
->nodes
[0];
3055 slot
= path
->slots
[0];
3056 write_extent_buffer(leaf
, buf
,
3057 btrfs_item_ptr_offset(leaf
, slot
),
3059 inode_add_bytes(inode
, datal
);
3062 btrfs_mark_buffer_dirty(leaf
);
3063 btrfs_release_path(path
);
3065 inode_inc_iversion(inode
);
3066 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3069 * we round up to the block size at eof when
3070 * determining which extents to clone above,
3071 * but shouldn't round up the file size
3073 endoff
= new_key
.offset
+ datal
;
3074 if (endoff
> destoff
+olen
)
3075 endoff
= destoff
+olen
;
3076 if (endoff
> inode
->i_size
)
3077 btrfs_i_size_write(inode
, endoff
);
3079 ret
= btrfs_update_inode(trans
, root
, inode
);
3081 btrfs_abort_transaction(trans
, root
, ret
);
3082 btrfs_end_transaction(trans
, root
);
3085 ret
= btrfs_end_transaction(trans
, root
);
3088 btrfs_release_path(path
);
3094 btrfs_release_path(path
);
3095 btrfs_free_path(path
);
3100 static noinline
long btrfs_ioctl_clone(struct file
*file
, unsigned long srcfd
,
3101 u64 off
, u64 olen
, u64 destoff
)
3103 struct inode
*inode
= fdentry(file
)->d_inode
;
3104 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3109 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
3114 * - split compressed inline extents. annoying: we need to
3115 * decompress into destination's address_space (the file offset
3116 * may change, so source mapping won't do), then recompress (or
3117 * otherwise reinsert) a subrange.
3118 * - allow ranges within the same file to be cloned (provided
3119 * they don't overlap)?
3122 /* the destination must be opened for writing */
3123 if (!(file
->f_mode
& FMODE_WRITE
) || (file
->f_flags
& O_APPEND
))
3126 if (btrfs_root_readonly(root
))
3129 ret
= mnt_want_write_file(file
);
3133 src_file
= fdget(srcfd
);
3134 if (!src_file
.file
) {
3136 goto out_drop_write
;
3140 if (src_file
.file
->f_path
.mnt
!= file
->f_path
.mnt
)
3143 src
= file_inode(src_file
.file
);
3149 /* the src must be open for reading */
3150 if (!(src_file
.file
->f_mode
& FMODE_READ
))
3153 /* don't make the dst file partly checksummed */
3154 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3155 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
))
3159 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
3163 if (src
->i_sb
!= inode
->i_sb
)
3168 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_PARENT
);
3169 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_CHILD
);
3171 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_PARENT
);
3172 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_CHILD
);
3175 mutex_lock(&src
->i_mutex
);
3178 /* determine range to clone */
3180 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
3183 olen
= len
= src
->i_size
- off
;
3184 /* if we extend to eof, continue to block boundary */
3185 if (off
+ len
== src
->i_size
)
3186 len
= ALIGN(src
->i_size
, bs
) - off
;
3188 /* verify the end result is block aligned */
3189 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
3190 !IS_ALIGNED(destoff
, bs
))
3193 /* verify if ranges are overlapped within the same file */
3195 if (destoff
+ len
> off
&& destoff
< off
+ len
)
3199 if (destoff
> inode
->i_size
) {
3200 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
3205 /* truncate page cache pages from target inode range */
3206 truncate_inode_pages_range(&inode
->i_data
, destoff
,
3207 PAGE_CACHE_ALIGN(destoff
+ len
) - 1);
3209 lock_extent_range(src
, off
, len
);
3211 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
);
3213 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+ len
- 1);
3215 mutex_unlock(&src
->i_mutex
);
3217 mutex_unlock(&inode
->i_mutex
);
3221 mnt_drop_write_file(file
);
3225 static long btrfs_ioctl_clone_range(struct file
*file
, void __user
*argp
)
3227 struct btrfs_ioctl_clone_range_args args
;
3229 if (copy_from_user(&args
, argp
, sizeof(args
)))
3231 return btrfs_ioctl_clone(file
, args
.src_fd
, args
.src_offset
,
3232 args
.src_length
, args
.dest_offset
);
3236 * there are many ways the trans_start and trans_end ioctls can lead
3237 * to deadlocks. They should only be used by applications that
3238 * basically own the machine, and have a very in depth understanding
3239 * of all the possible deadlocks and enospc problems.
3241 static long btrfs_ioctl_trans_start(struct file
*file
)
3243 struct inode
*inode
= file_inode(file
);
3244 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3245 struct btrfs_trans_handle
*trans
;
3249 if (!capable(CAP_SYS_ADMIN
))
3253 if (file
->private_data
)
3257 if (btrfs_root_readonly(root
))
3260 ret
= mnt_want_write_file(file
);
3264 atomic_inc(&root
->fs_info
->open_ioctl_trans
);
3267 trans
= btrfs_start_ioctl_transaction(root
);
3271 file
->private_data
= trans
;
3275 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3276 mnt_drop_write_file(file
);
3281 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3283 struct inode
*inode
= file_inode(file
);
3284 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3285 struct btrfs_root
*new_root
;
3286 struct btrfs_dir_item
*di
;
3287 struct btrfs_trans_handle
*trans
;
3288 struct btrfs_path
*path
;
3289 struct btrfs_key location
;
3290 struct btrfs_disk_key disk_key
;
3295 if (!capable(CAP_SYS_ADMIN
))
3298 ret
= mnt_want_write_file(file
);
3302 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3308 objectid
= BTRFS_FS_TREE_OBJECTID
;
3310 location
.objectid
= objectid
;
3311 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3312 location
.offset
= (u64
)-1;
3314 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
3315 if (IS_ERR(new_root
)) {
3316 ret
= PTR_ERR(new_root
);
3320 path
= btrfs_alloc_path();
3325 path
->leave_spinning
= 1;
3327 trans
= btrfs_start_transaction(root
, 1);
3328 if (IS_ERR(trans
)) {
3329 btrfs_free_path(path
);
3330 ret
= PTR_ERR(trans
);
3334 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
3335 di
= btrfs_lookup_dir_item(trans
, root
->fs_info
->tree_root
, path
,
3336 dir_id
, "default", 7, 1);
3337 if (IS_ERR_OR_NULL(di
)) {
3338 btrfs_free_path(path
);
3339 btrfs_end_transaction(trans
, root
);
3340 printk(KERN_ERR
"Umm, you don't have the default dir item, "
3341 "this isn't going to work\n");
3346 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3347 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3348 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3349 btrfs_free_path(path
);
3351 btrfs_set_fs_incompat(root
->fs_info
, DEFAULT_SUBVOL
);
3352 btrfs_end_transaction(trans
, root
);
3354 mnt_drop_write_file(file
);
3358 void btrfs_get_block_group_info(struct list_head
*groups_list
,
3359 struct btrfs_ioctl_space_info
*space
)
3361 struct btrfs_block_group_cache
*block_group
;
3363 space
->total_bytes
= 0;
3364 space
->used_bytes
= 0;
3366 list_for_each_entry(block_group
, groups_list
, list
) {
3367 space
->flags
= block_group
->flags
;
3368 space
->total_bytes
+= block_group
->key
.offset
;
3369 space
->used_bytes
+=
3370 btrfs_block_group_used(&block_group
->item
);
3374 static long btrfs_ioctl_space_info(struct btrfs_root
*root
, void __user
*arg
)
3376 struct btrfs_ioctl_space_args space_args
;
3377 struct btrfs_ioctl_space_info space
;
3378 struct btrfs_ioctl_space_info
*dest
;
3379 struct btrfs_ioctl_space_info
*dest_orig
;
3380 struct btrfs_ioctl_space_info __user
*user_dest
;
3381 struct btrfs_space_info
*info
;
3382 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3383 BTRFS_BLOCK_GROUP_SYSTEM
,
3384 BTRFS_BLOCK_GROUP_METADATA
,
3385 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3392 if (copy_from_user(&space_args
,
3393 (struct btrfs_ioctl_space_args __user
*)arg
,
3394 sizeof(space_args
)))
3397 for (i
= 0; i
< num_types
; i
++) {
3398 struct btrfs_space_info
*tmp
;
3402 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3404 if (tmp
->flags
== types
[i
]) {
3414 down_read(&info
->groups_sem
);
3415 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3416 if (!list_empty(&info
->block_groups
[c
]))
3419 up_read(&info
->groups_sem
);
3422 /* space_slots == 0 means they are asking for a count */
3423 if (space_args
.space_slots
== 0) {
3424 space_args
.total_spaces
= slot_count
;
3428 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
3430 alloc_size
= sizeof(*dest
) * slot_count
;
3432 /* we generally have at most 6 or so space infos, one for each raid
3433 * level. So, a whole page should be more than enough for everyone
3435 if (alloc_size
> PAGE_CACHE_SIZE
)
3438 space_args
.total_spaces
= 0;
3439 dest
= kmalloc(alloc_size
, GFP_NOFS
);
3444 /* now we have a buffer to copy into */
3445 for (i
= 0; i
< num_types
; i
++) {
3446 struct btrfs_space_info
*tmp
;
3453 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3455 if (tmp
->flags
== types
[i
]) {
3464 down_read(&info
->groups_sem
);
3465 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3466 if (!list_empty(&info
->block_groups
[c
])) {
3467 btrfs_get_block_group_info(
3468 &info
->block_groups
[c
], &space
);
3469 memcpy(dest
, &space
, sizeof(space
));
3471 space_args
.total_spaces
++;
3477 up_read(&info
->groups_sem
);
3480 user_dest
= (struct btrfs_ioctl_space_info __user
*)
3481 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
3483 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
3488 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
3495 * there are many ways the trans_start and trans_end ioctls can lead
3496 * to deadlocks. They should only be used by applications that
3497 * basically own the machine, and have a very in depth understanding
3498 * of all the possible deadlocks and enospc problems.
3500 long btrfs_ioctl_trans_end(struct file
*file
)
3502 struct inode
*inode
= file_inode(file
);
3503 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3504 struct btrfs_trans_handle
*trans
;
3506 trans
= file
->private_data
;
3509 file
->private_data
= NULL
;
3511 btrfs_end_transaction(trans
, root
);
3513 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3515 mnt_drop_write_file(file
);
3519 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
3522 struct btrfs_trans_handle
*trans
;
3526 trans
= btrfs_attach_transaction_barrier(root
);
3527 if (IS_ERR(trans
)) {
3528 if (PTR_ERR(trans
) != -ENOENT
)
3529 return PTR_ERR(trans
);
3531 /* No running transaction, don't bother */
3532 transid
= root
->fs_info
->last_trans_committed
;
3535 transid
= trans
->transid
;
3536 ret
= btrfs_commit_transaction_async(trans
, root
, 0);
3538 btrfs_end_transaction(trans
, root
);
3543 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
3548 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_root
*root
,
3554 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
3557 transid
= 0; /* current trans */
3559 return btrfs_wait_for_commit(root
, transid
);
3562 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
3564 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
3565 struct btrfs_ioctl_scrub_args
*sa
;
3568 if (!capable(CAP_SYS_ADMIN
))
3571 sa
= memdup_user(arg
, sizeof(*sa
));
3575 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
3576 ret
= mnt_want_write_file(file
);
3581 ret
= btrfs_scrub_dev(root
->fs_info
, sa
->devid
, sa
->start
, sa
->end
,
3582 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
3585 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3588 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
3589 mnt_drop_write_file(file
);
3595 static long btrfs_ioctl_scrub_cancel(struct btrfs_root
*root
, void __user
*arg
)
3597 if (!capable(CAP_SYS_ADMIN
))
3600 return btrfs_scrub_cancel(root
->fs_info
);
3603 static long btrfs_ioctl_scrub_progress(struct btrfs_root
*root
,
3606 struct btrfs_ioctl_scrub_args
*sa
;
3609 if (!capable(CAP_SYS_ADMIN
))
3612 sa
= memdup_user(arg
, sizeof(*sa
));
3616 ret
= btrfs_scrub_progress(root
, sa
->devid
, &sa
->progress
);
3618 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3625 static long btrfs_ioctl_get_dev_stats(struct btrfs_root
*root
,
3628 struct btrfs_ioctl_get_dev_stats
*sa
;
3631 sa
= memdup_user(arg
, sizeof(*sa
));
3635 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
3640 ret
= btrfs_get_dev_stats(root
, sa
);
3642 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3649 static long btrfs_ioctl_dev_replace(struct btrfs_root
*root
, void __user
*arg
)
3651 struct btrfs_ioctl_dev_replace_args
*p
;
3654 if (!capable(CAP_SYS_ADMIN
))
3657 p
= memdup_user(arg
, sizeof(*p
));
3662 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
3663 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
) {
3668 &root
->fs_info
->mutually_exclusive_operation_running
,
3670 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3672 ret
= btrfs_dev_replace_start(root
, p
);
3674 &root
->fs_info
->mutually_exclusive_operation_running
,
3678 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
3679 btrfs_dev_replace_status(root
->fs_info
, p
);
3682 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
3683 ret
= btrfs_dev_replace_cancel(root
->fs_info
, p
);
3690 if (copy_to_user(arg
, p
, sizeof(*p
)))
3697 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
3703 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
3704 struct inode_fs_paths
*ipath
= NULL
;
3705 struct btrfs_path
*path
;
3707 if (!capable(CAP_DAC_READ_SEARCH
))
3710 path
= btrfs_alloc_path();
3716 ipa
= memdup_user(arg
, sizeof(*ipa
));
3723 size
= min_t(u32
, ipa
->size
, 4096);
3724 ipath
= init_ipath(size
, root
, path
);
3725 if (IS_ERR(ipath
)) {
3726 ret
= PTR_ERR(ipath
);
3731 ret
= paths_from_inode(ipa
->inum
, ipath
);
3735 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
3736 rel_ptr
= ipath
->fspath
->val
[i
] -
3737 (u64
)(unsigned long)ipath
->fspath
->val
;
3738 ipath
->fspath
->val
[i
] = rel_ptr
;
3741 ret
= copy_to_user((void *)(unsigned long)ipa
->fspath
,
3742 (void *)(unsigned long)ipath
->fspath
, size
);
3749 btrfs_free_path(path
);
3756 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
3758 struct btrfs_data_container
*inodes
= ctx
;
3759 const size_t c
= 3 * sizeof(u64
);
3761 if (inodes
->bytes_left
>= c
) {
3762 inodes
->bytes_left
-= c
;
3763 inodes
->val
[inodes
->elem_cnt
] = inum
;
3764 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
3765 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
3766 inodes
->elem_cnt
+= 3;
3768 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
3769 inodes
->bytes_left
= 0;
3770 inodes
->elem_missed
+= 3;
3776 static long btrfs_ioctl_logical_to_ino(struct btrfs_root
*root
,
3781 struct btrfs_ioctl_logical_ino_args
*loi
;
3782 struct btrfs_data_container
*inodes
= NULL
;
3783 struct btrfs_path
*path
= NULL
;
3785 if (!capable(CAP_SYS_ADMIN
))
3788 loi
= memdup_user(arg
, sizeof(*loi
));
3795 path
= btrfs_alloc_path();
3801 size
= min_t(u32
, loi
->size
, 64 * 1024);
3802 inodes
= init_data_container(size
);
3803 if (IS_ERR(inodes
)) {
3804 ret
= PTR_ERR(inodes
);
3809 ret
= iterate_inodes_from_logical(loi
->logical
, root
->fs_info
, path
,
3810 build_ino_list
, inodes
);
3816 ret
= copy_to_user((void *)(unsigned long)loi
->inodes
,
3817 (void *)(unsigned long)inodes
, size
);
3822 btrfs_free_path(path
);
3829 void update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
, int lock
,
3830 struct btrfs_ioctl_balance_args
*bargs
)
3832 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3834 bargs
->flags
= bctl
->flags
;
3836 if (atomic_read(&fs_info
->balance_running
))
3837 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
3838 if (atomic_read(&fs_info
->balance_pause_req
))
3839 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
3840 if (atomic_read(&fs_info
->balance_cancel_req
))
3841 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
3843 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
3844 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
3845 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
3848 spin_lock(&fs_info
->balance_lock
);
3849 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
3850 spin_unlock(&fs_info
->balance_lock
);
3852 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
3856 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
3858 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
3859 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3860 struct btrfs_ioctl_balance_args
*bargs
;
3861 struct btrfs_balance_control
*bctl
;
3862 bool need_unlock
; /* for mut. excl. ops lock */
3865 if (!capable(CAP_SYS_ADMIN
))
3868 ret
= mnt_want_write_file(file
);
3873 if (!atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
3874 mutex_lock(&fs_info
->volume_mutex
);
3875 mutex_lock(&fs_info
->balance_mutex
);
3881 * mut. excl. ops lock is locked. Three possibilites:
3882 * (1) some other op is running
3883 * (2) balance is running
3884 * (3) balance is paused -- special case (think resume)
3886 mutex_lock(&fs_info
->balance_mutex
);
3887 if (fs_info
->balance_ctl
) {
3888 /* this is either (2) or (3) */
3889 if (!atomic_read(&fs_info
->balance_running
)) {
3890 mutex_unlock(&fs_info
->balance_mutex
);
3891 if (!mutex_trylock(&fs_info
->volume_mutex
))
3893 mutex_lock(&fs_info
->balance_mutex
);
3895 if (fs_info
->balance_ctl
&&
3896 !atomic_read(&fs_info
->balance_running
)) {
3898 need_unlock
= false;
3902 mutex_unlock(&fs_info
->balance_mutex
);
3903 mutex_unlock(&fs_info
->volume_mutex
);
3907 mutex_unlock(&fs_info
->balance_mutex
);
3913 mutex_unlock(&fs_info
->balance_mutex
);
3914 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3919 BUG_ON(!atomic_read(&fs_info
->mutually_exclusive_operation_running
));
3922 bargs
= memdup_user(arg
, sizeof(*bargs
));
3923 if (IS_ERR(bargs
)) {
3924 ret
= PTR_ERR(bargs
);
3928 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
3929 if (!fs_info
->balance_ctl
) {
3934 bctl
= fs_info
->balance_ctl
;
3935 spin_lock(&fs_info
->balance_lock
);
3936 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
3937 spin_unlock(&fs_info
->balance_lock
);
3945 if (fs_info
->balance_ctl
) {
3950 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
3956 bctl
->fs_info
= fs_info
;
3958 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
3959 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
3960 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
3962 bctl
->flags
= bargs
->flags
;
3964 /* balance everything - no filters */
3965 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
3970 * Ownership of bctl and mutually_exclusive_operation_running
3971 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
3972 * or, if restriper was paused all the way until unmount, in
3973 * free_fs_info. mutually_exclusive_operation_running is
3974 * cleared in __cancel_balance.
3976 need_unlock
= false;
3978 ret
= btrfs_balance(bctl
, bargs
);
3981 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
3988 mutex_unlock(&fs_info
->balance_mutex
);
3989 mutex_unlock(&fs_info
->volume_mutex
);
3991 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
3993 mnt_drop_write_file(file
);
3997 static long btrfs_ioctl_balance_ctl(struct btrfs_root
*root
, int cmd
)
3999 if (!capable(CAP_SYS_ADMIN
))
4003 case BTRFS_BALANCE_CTL_PAUSE
:
4004 return btrfs_pause_balance(root
->fs_info
);
4005 case BTRFS_BALANCE_CTL_CANCEL
:
4006 return btrfs_cancel_balance(root
->fs_info
);
4012 static long btrfs_ioctl_balance_progress(struct btrfs_root
*root
,
4015 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4016 struct btrfs_ioctl_balance_args
*bargs
;
4019 if (!capable(CAP_SYS_ADMIN
))
4022 mutex_lock(&fs_info
->balance_mutex
);
4023 if (!fs_info
->balance_ctl
) {
4028 bargs
= kzalloc(sizeof(*bargs
), GFP_NOFS
);
4034 update_ioctl_balance_args(fs_info
, 1, bargs
);
4036 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4041 mutex_unlock(&fs_info
->balance_mutex
);
4045 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4047 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4048 struct btrfs_ioctl_quota_ctl_args
*sa
;
4049 struct btrfs_trans_handle
*trans
= NULL
;
4053 if (!capable(CAP_SYS_ADMIN
))
4056 ret
= mnt_want_write_file(file
);
4060 sa
= memdup_user(arg
, sizeof(*sa
));
4066 down_write(&root
->fs_info
->subvol_sem
);
4067 trans
= btrfs_start_transaction(root
->fs_info
->tree_root
, 2);
4068 if (IS_ERR(trans
)) {
4069 ret
= PTR_ERR(trans
);
4074 case BTRFS_QUOTA_CTL_ENABLE
:
4075 ret
= btrfs_quota_enable(trans
, root
->fs_info
);
4077 case BTRFS_QUOTA_CTL_DISABLE
:
4078 ret
= btrfs_quota_disable(trans
, root
->fs_info
);
4085 err
= btrfs_commit_transaction(trans
, root
->fs_info
->tree_root
);
4090 up_write(&root
->fs_info
->subvol_sem
);
4092 mnt_drop_write_file(file
);
4096 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4098 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4099 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4100 struct btrfs_trans_handle
*trans
;
4104 if (!capable(CAP_SYS_ADMIN
))
4107 ret
= mnt_want_write_file(file
);
4111 sa
= memdup_user(arg
, sizeof(*sa
));
4117 trans
= btrfs_join_transaction(root
);
4118 if (IS_ERR(trans
)) {
4119 ret
= PTR_ERR(trans
);
4123 /* FIXME: check if the IDs really exist */
4125 ret
= btrfs_add_qgroup_relation(trans
, root
->fs_info
,
4128 ret
= btrfs_del_qgroup_relation(trans
, root
->fs_info
,
4132 err
= btrfs_end_transaction(trans
, root
);
4139 mnt_drop_write_file(file
);
4143 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4145 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4146 struct btrfs_ioctl_qgroup_create_args
*sa
;
4147 struct btrfs_trans_handle
*trans
;
4151 if (!capable(CAP_SYS_ADMIN
))
4154 ret
= mnt_want_write_file(file
);
4158 sa
= memdup_user(arg
, sizeof(*sa
));
4164 if (!sa
->qgroupid
) {
4169 trans
= btrfs_join_transaction(root
);
4170 if (IS_ERR(trans
)) {
4171 ret
= PTR_ERR(trans
);
4175 /* FIXME: check if the IDs really exist */
4177 ret
= btrfs_create_qgroup(trans
, root
->fs_info
, sa
->qgroupid
,
4180 ret
= btrfs_remove_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4183 err
= btrfs_end_transaction(trans
, root
);
4190 mnt_drop_write_file(file
);
4194 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4196 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4197 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4198 struct btrfs_trans_handle
*trans
;
4203 if (!capable(CAP_SYS_ADMIN
))
4206 ret
= mnt_want_write_file(file
);
4210 sa
= memdup_user(arg
, sizeof(*sa
));
4216 trans
= btrfs_join_transaction(root
);
4217 if (IS_ERR(trans
)) {
4218 ret
= PTR_ERR(trans
);
4222 qgroupid
= sa
->qgroupid
;
4224 /* take the current subvol as qgroup */
4225 qgroupid
= root
->root_key
.objectid
;
4228 /* FIXME: check if the IDs really exist */
4229 ret
= btrfs_limit_qgroup(trans
, root
->fs_info
, qgroupid
, &sa
->lim
);
4231 err
= btrfs_end_transaction(trans
, root
);
4238 mnt_drop_write_file(file
);
4242 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4244 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4245 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4248 if (!capable(CAP_SYS_ADMIN
))
4251 ret
= mnt_want_write_file(file
);
4255 qsa
= memdup_user(arg
, sizeof(*qsa
));
4266 ret
= btrfs_qgroup_rescan(root
->fs_info
);
4271 mnt_drop_write_file(file
);
4275 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
4277 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4278 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4281 if (!capable(CAP_SYS_ADMIN
))
4284 qsa
= kzalloc(sizeof(*qsa
), GFP_NOFS
);
4288 if (root
->fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4290 qsa
->progress
= root
->fs_info
->qgroup_rescan_progress
.objectid
;
4293 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
4300 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
4302 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
4304 if (!capable(CAP_SYS_ADMIN
))
4307 return btrfs_qgroup_wait_for_completion(root
->fs_info
);
4310 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
4313 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
4314 struct inode
*inode
= file_inode(file
);
4315 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4316 struct btrfs_root_item
*root_item
= &root
->root_item
;
4317 struct btrfs_trans_handle
*trans
;
4318 struct timespec ct
= CURRENT_TIME
;
4320 int received_uuid_changed
;
4322 ret
= mnt_want_write_file(file
);
4326 down_write(&root
->fs_info
->subvol_sem
);
4328 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
4333 if (btrfs_root_readonly(root
)) {
4338 if (!inode_owner_or_capable(inode
)) {
4343 sa
= memdup_user(arg
, sizeof(*sa
));
4352 * 2 - uuid items (received uuid + subvol uuid)
4354 trans
= btrfs_start_transaction(root
, 3);
4355 if (IS_ERR(trans
)) {
4356 ret
= PTR_ERR(trans
);
4361 sa
->rtransid
= trans
->transid
;
4362 sa
->rtime
.sec
= ct
.tv_sec
;
4363 sa
->rtime
.nsec
= ct
.tv_nsec
;
4365 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4367 if (received_uuid_changed
&&
4368 !btrfs_is_empty_uuid(root_item
->received_uuid
))
4369 btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
4370 root_item
->received_uuid
,
4371 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4372 root
->root_key
.objectid
);
4373 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4374 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4375 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4376 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4377 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4378 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4379 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
4381 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
4382 &root
->root_key
, &root
->root_item
);
4384 btrfs_end_transaction(trans
, root
);
4387 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
4388 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
4390 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4391 root
->root_key
.objectid
);
4392 if (ret
< 0 && ret
!= -EEXIST
) {
4393 btrfs_abort_transaction(trans
, root
, ret
);
4397 ret
= btrfs_commit_transaction(trans
, root
);
4399 btrfs_abort_transaction(trans
, root
, ret
);
4403 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
4409 up_write(&root
->fs_info
->subvol_sem
);
4410 mnt_drop_write_file(file
);
4414 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
4416 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4419 char label
[BTRFS_LABEL_SIZE
];
4421 spin_lock(&root
->fs_info
->super_lock
);
4422 memcpy(label
, root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
4423 spin_unlock(&root
->fs_info
->super_lock
);
4425 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
4427 if (len
== BTRFS_LABEL_SIZE
) {
4428 pr_warn("btrfs: label is too long, return the first %zu bytes\n",
4432 ret
= copy_to_user(arg
, label
, len
);
4434 return ret
? -EFAULT
: 0;
4437 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
4439 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4440 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
4441 struct btrfs_trans_handle
*trans
;
4442 char label
[BTRFS_LABEL_SIZE
];
4445 if (!capable(CAP_SYS_ADMIN
))
4448 if (copy_from_user(label
, arg
, sizeof(label
)))
4451 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
4452 pr_err("btrfs: unable to set label with more than %d bytes\n",
4453 BTRFS_LABEL_SIZE
- 1);
4457 ret
= mnt_want_write_file(file
);
4461 trans
= btrfs_start_transaction(root
, 0);
4462 if (IS_ERR(trans
)) {
4463 ret
= PTR_ERR(trans
);
4467 spin_lock(&root
->fs_info
->super_lock
);
4468 strcpy(super_block
->label
, label
);
4469 spin_unlock(&root
->fs_info
->super_lock
);
4470 ret
= btrfs_end_transaction(trans
, root
);
4473 mnt_drop_write_file(file
);
4477 long btrfs_ioctl(struct file
*file
, unsigned int
4478 cmd
, unsigned long arg
)
4480 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4481 void __user
*argp
= (void __user
*)arg
;
4484 case FS_IOC_GETFLAGS
:
4485 return btrfs_ioctl_getflags(file
, argp
);
4486 case FS_IOC_SETFLAGS
:
4487 return btrfs_ioctl_setflags(file
, argp
);
4488 case FS_IOC_GETVERSION
:
4489 return btrfs_ioctl_getversion(file
, argp
);
4491 return btrfs_ioctl_fitrim(file
, argp
);
4492 case BTRFS_IOC_SNAP_CREATE
:
4493 return btrfs_ioctl_snap_create(file
, argp
, 0);
4494 case BTRFS_IOC_SNAP_CREATE_V2
:
4495 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
4496 case BTRFS_IOC_SUBVOL_CREATE
:
4497 return btrfs_ioctl_snap_create(file
, argp
, 1);
4498 case BTRFS_IOC_SUBVOL_CREATE_V2
:
4499 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
4500 case BTRFS_IOC_SNAP_DESTROY
:
4501 return btrfs_ioctl_snap_destroy(file
, argp
);
4502 case BTRFS_IOC_SUBVOL_GETFLAGS
:
4503 return btrfs_ioctl_subvol_getflags(file
, argp
);
4504 case BTRFS_IOC_SUBVOL_SETFLAGS
:
4505 return btrfs_ioctl_subvol_setflags(file
, argp
);
4506 case BTRFS_IOC_DEFAULT_SUBVOL
:
4507 return btrfs_ioctl_default_subvol(file
, argp
);
4508 case BTRFS_IOC_DEFRAG
:
4509 return btrfs_ioctl_defrag(file
, NULL
);
4510 case BTRFS_IOC_DEFRAG_RANGE
:
4511 return btrfs_ioctl_defrag(file
, argp
);
4512 case BTRFS_IOC_RESIZE
:
4513 return btrfs_ioctl_resize(file
, argp
);
4514 case BTRFS_IOC_ADD_DEV
:
4515 return btrfs_ioctl_add_dev(root
, argp
);
4516 case BTRFS_IOC_RM_DEV
:
4517 return btrfs_ioctl_rm_dev(file
, argp
);
4518 case BTRFS_IOC_FS_INFO
:
4519 return btrfs_ioctl_fs_info(root
, argp
);
4520 case BTRFS_IOC_DEV_INFO
:
4521 return btrfs_ioctl_dev_info(root
, argp
);
4522 case BTRFS_IOC_BALANCE
:
4523 return btrfs_ioctl_balance(file
, NULL
);
4524 case BTRFS_IOC_CLONE
:
4525 return btrfs_ioctl_clone(file
, arg
, 0, 0, 0);
4526 case BTRFS_IOC_CLONE_RANGE
:
4527 return btrfs_ioctl_clone_range(file
, argp
);
4528 case BTRFS_IOC_TRANS_START
:
4529 return btrfs_ioctl_trans_start(file
);
4530 case BTRFS_IOC_TRANS_END
:
4531 return btrfs_ioctl_trans_end(file
);
4532 case BTRFS_IOC_TREE_SEARCH
:
4533 return btrfs_ioctl_tree_search(file
, argp
);
4534 case BTRFS_IOC_INO_LOOKUP
:
4535 return btrfs_ioctl_ino_lookup(file
, argp
);
4536 case BTRFS_IOC_INO_PATHS
:
4537 return btrfs_ioctl_ino_to_path(root
, argp
);
4538 case BTRFS_IOC_LOGICAL_INO
:
4539 return btrfs_ioctl_logical_to_ino(root
, argp
);
4540 case BTRFS_IOC_SPACE_INFO
:
4541 return btrfs_ioctl_space_info(root
, argp
);
4542 case BTRFS_IOC_SYNC
: {
4545 ret
= btrfs_start_all_delalloc_inodes(root
->fs_info
, 0);
4548 ret
= btrfs_sync_fs(file
->f_dentry
->d_sb
, 1);
4551 case BTRFS_IOC_START_SYNC
:
4552 return btrfs_ioctl_start_sync(root
, argp
);
4553 case BTRFS_IOC_WAIT_SYNC
:
4554 return btrfs_ioctl_wait_sync(root
, argp
);
4555 case BTRFS_IOC_SCRUB
:
4556 return btrfs_ioctl_scrub(file
, argp
);
4557 case BTRFS_IOC_SCRUB_CANCEL
:
4558 return btrfs_ioctl_scrub_cancel(root
, argp
);
4559 case BTRFS_IOC_SCRUB_PROGRESS
:
4560 return btrfs_ioctl_scrub_progress(root
, argp
);
4561 case BTRFS_IOC_BALANCE_V2
:
4562 return btrfs_ioctl_balance(file
, argp
);
4563 case BTRFS_IOC_BALANCE_CTL
:
4564 return btrfs_ioctl_balance_ctl(root
, arg
);
4565 case BTRFS_IOC_BALANCE_PROGRESS
:
4566 return btrfs_ioctl_balance_progress(root
, argp
);
4567 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
4568 return btrfs_ioctl_set_received_subvol(file
, argp
);
4569 case BTRFS_IOC_SEND
:
4570 return btrfs_ioctl_send(file
, argp
);
4571 case BTRFS_IOC_GET_DEV_STATS
:
4572 return btrfs_ioctl_get_dev_stats(root
, argp
);
4573 case BTRFS_IOC_QUOTA_CTL
:
4574 return btrfs_ioctl_quota_ctl(file
, argp
);
4575 case BTRFS_IOC_QGROUP_ASSIGN
:
4576 return btrfs_ioctl_qgroup_assign(file
, argp
);
4577 case BTRFS_IOC_QGROUP_CREATE
:
4578 return btrfs_ioctl_qgroup_create(file
, argp
);
4579 case BTRFS_IOC_QGROUP_LIMIT
:
4580 return btrfs_ioctl_qgroup_limit(file
, argp
);
4581 case BTRFS_IOC_QUOTA_RESCAN
:
4582 return btrfs_ioctl_quota_rescan(file
, argp
);
4583 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
4584 return btrfs_ioctl_quota_rescan_status(file
, argp
);
4585 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
4586 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
4587 case BTRFS_IOC_DEV_REPLACE
:
4588 return btrfs_ioctl_dev_replace(root
, argp
);
4589 case BTRFS_IOC_GET_FSLABEL
:
4590 return btrfs_ioctl_get_fslabel(file
, argp
);
4591 case BTRFS_IOC_SET_FSLABEL
:
4592 return btrfs_ioctl_set_fslabel(file
, argp
);
4593 case BTRFS_IOC_FILE_EXTENT_SAME
:
4594 return btrfs_ioctl_file_extent_same(file
, argp
);