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"
61 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
62 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
);
64 /* Mask out flags that are inappropriate for the given type of inode. */
65 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
69 else if (S_ISREG(mode
))
70 return flags
& ~FS_DIRSYNC_FL
;
72 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
76 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
78 static unsigned int btrfs_flags_to_ioctl(unsigned int flags
)
80 unsigned int iflags
= 0;
82 if (flags
& BTRFS_INODE_SYNC
)
84 if (flags
& BTRFS_INODE_IMMUTABLE
)
85 iflags
|= FS_IMMUTABLE_FL
;
86 if (flags
& BTRFS_INODE_APPEND
)
87 iflags
|= FS_APPEND_FL
;
88 if (flags
& BTRFS_INODE_NODUMP
)
89 iflags
|= FS_NODUMP_FL
;
90 if (flags
& BTRFS_INODE_NOATIME
)
91 iflags
|= FS_NOATIME_FL
;
92 if (flags
& BTRFS_INODE_DIRSYNC
)
93 iflags
|= FS_DIRSYNC_FL
;
94 if (flags
& BTRFS_INODE_NODATACOW
)
95 iflags
|= FS_NOCOW_FL
;
97 if ((flags
& BTRFS_INODE_COMPRESS
) && !(flags
& BTRFS_INODE_NOCOMPRESS
))
98 iflags
|= FS_COMPR_FL
;
99 else if (flags
& BTRFS_INODE_NOCOMPRESS
)
100 iflags
|= FS_NOCOMP_FL
;
106 * Update inode->i_flags based on the btrfs internal flags.
108 void btrfs_update_iflags(struct inode
*inode
)
110 struct btrfs_inode
*ip
= BTRFS_I(inode
);
112 inode
->i_flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
);
114 if (ip
->flags
& BTRFS_INODE_SYNC
)
115 inode
->i_flags
|= S_SYNC
;
116 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
117 inode
->i_flags
|= S_IMMUTABLE
;
118 if (ip
->flags
& BTRFS_INODE_APPEND
)
119 inode
->i_flags
|= S_APPEND
;
120 if (ip
->flags
& BTRFS_INODE_NOATIME
)
121 inode
->i_flags
|= S_NOATIME
;
122 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
123 inode
->i_flags
|= S_DIRSYNC
;
127 * Inherit flags from the parent inode.
129 * Currently only the compression flags and the cow flags are inherited.
131 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
138 flags
= BTRFS_I(dir
)->flags
;
140 if (flags
& BTRFS_INODE_NOCOMPRESS
) {
141 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_COMPRESS
;
142 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
143 } else if (flags
& BTRFS_INODE_COMPRESS
) {
144 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
145 BTRFS_I(inode
)->flags
|= BTRFS_INODE_COMPRESS
;
148 if (flags
& BTRFS_INODE_NODATACOW
) {
149 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
;
150 if (S_ISREG(inode
->i_mode
))
151 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
154 btrfs_update_iflags(inode
);
157 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
159 struct btrfs_inode
*ip
= BTRFS_I(file_inode(file
));
160 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
162 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
167 static int check_flags(unsigned int flags
)
169 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
170 FS_NOATIME_FL
| FS_NODUMP_FL
| \
171 FS_SYNC_FL
| FS_DIRSYNC_FL
| \
172 FS_NOCOMP_FL
| FS_COMPR_FL
|
176 if ((flags
& FS_NOCOMP_FL
) && (flags
& FS_COMPR_FL
))
182 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
184 struct inode
*inode
= file_inode(file
);
185 struct btrfs_inode
*ip
= BTRFS_I(inode
);
186 struct btrfs_root
*root
= ip
->root
;
187 struct btrfs_trans_handle
*trans
;
188 unsigned int flags
, oldflags
;
191 unsigned int i_oldflags
;
194 if (btrfs_root_readonly(root
))
197 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
200 ret
= check_flags(flags
);
204 if (!inode_owner_or_capable(inode
))
207 ret
= mnt_want_write_file(file
);
211 mutex_lock(&inode
->i_mutex
);
213 ip_oldflags
= ip
->flags
;
214 i_oldflags
= inode
->i_flags
;
215 mode
= inode
->i_mode
;
217 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
218 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
219 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
220 if (!capable(CAP_LINUX_IMMUTABLE
)) {
226 if (flags
& FS_SYNC_FL
)
227 ip
->flags
|= BTRFS_INODE_SYNC
;
229 ip
->flags
&= ~BTRFS_INODE_SYNC
;
230 if (flags
& FS_IMMUTABLE_FL
)
231 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
233 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
234 if (flags
& FS_APPEND_FL
)
235 ip
->flags
|= BTRFS_INODE_APPEND
;
237 ip
->flags
&= ~BTRFS_INODE_APPEND
;
238 if (flags
& FS_NODUMP_FL
)
239 ip
->flags
|= BTRFS_INODE_NODUMP
;
241 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
242 if (flags
& FS_NOATIME_FL
)
243 ip
->flags
|= BTRFS_INODE_NOATIME
;
245 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
246 if (flags
& FS_DIRSYNC_FL
)
247 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
249 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
250 if (flags
& FS_NOCOW_FL
) {
253 * It's safe to turn csums off here, no extents exist.
254 * Otherwise we want the flag to reflect the real COW
255 * status of the file and will not set it.
257 if (inode
->i_size
== 0)
258 ip
->flags
|= BTRFS_INODE_NODATACOW
259 | BTRFS_INODE_NODATASUM
;
261 ip
->flags
|= BTRFS_INODE_NODATACOW
;
265 * Revert back under same assuptions as above
268 if (inode
->i_size
== 0)
269 ip
->flags
&= ~(BTRFS_INODE_NODATACOW
270 | BTRFS_INODE_NODATASUM
);
272 ip
->flags
&= ~BTRFS_INODE_NODATACOW
;
277 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
278 * flag may be changed automatically if compression code won't make
281 if (flags
& FS_NOCOMP_FL
) {
282 ip
->flags
&= ~BTRFS_INODE_COMPRESS
;
283 ip
->flags
|= BTRFS_INODE_NOCOMPRESS
;
284 } else if (flags
& FS_COMPR_FL
) {
285 ip
->flags
|= BTRFS_INODE_COMPRESS
;
286 ip
->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
288 ip
->flags
&= ~(BTRFS_INODE_COMPRESS
| BTRFS_INODE_NOCOMPRESS
);
291 trans
= btrfs_start_transaction(root
, 1);
293 ret
= PTR_ERR(trans
);
297 btrfs_update_iflags(inode
);
298 inode_inc_iversion(inode
);
299 inode
->i_ctime
= CURRENT_TIME
;
300 ret
= btrfs_update_inode(trans
, root
, inode
);
302 btrfs_end_transaction(trans
, root
);
305 ip
->flags
= ip_oldflags
;
306 inode
->i_flags
= i_oldflags
;
310 mutex_unlock(&inode
->i_mutex
);
311 mnt_drop_write_file(file
);
315 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
317 struct inode
*inode
= file_inode(file
);
319 return put_user(inode
->i_generation
, arg
);
322 static noinline
int btrfs_ioctl_fitrim(struct file
*file
, void __user
*arg
)
324 struct btrfs_fs_info
*fs_info
= btrfs_sb(file_inode(file
)->i_sb
);
325 struct btrfs_device
*device
;
326 struct request_queue
*q
;
327 struct fstrim_range range
;
328 u64 minlen
= ULLONG_MAX
;
330 u64 total_bytes
= btrfs_super_total_bytes(fs_info
->super_copy
);
333 if (!capable(CAP_SYS_ADMIN
))
337 list_for_each_entry_rcu(device
, &fs_info
->fs_devices
->devices
,
341 q
= bdev_get_queue(device
->bdev
);
342 if (blk_queue_discard(q
)) {
344 minlen
= min((u64
)q
->limits
.discard_granularity
,
352 if (copy_from_user(&range
, arg
, sizeof(range
)))
354 if (range
.start
> total_bytes
||
355 range
.len
< fs_info
->sb
->s_blocksize
)
358 range
.len
= min(range
.len
, total_bytes
- range
.start
);
359 range
.minlen
= max(range
.minlen
, minlen
);
360 ret
= btrfs_trim_fs(fs_info
->tree_root
, &range
);
364 if (copy_to_user(arg
, &range
, sizeof(range
)))
370 int btrfs_is_empty_uuid(u8
*uuid
)
374 for (i
= 0; i
< BTRFS_UUID_SIZE
; i
++) {
381 static noinline
int create_subvol(struct inode
*dir
,
382 struct dentry
*dentry
,
383 char *name
, int namelen
,
385 struct btrfs_qgroup_inherit
*inherit
)
387 struct btrfs_trans_handle
*trans
;
388 struct btrfs_key key
;
389 struct btrfs_root_item root_item
;
390 struct btrfs_inode_item
*inode_item
;
391 struct extent_buffer
*leaf
;
392 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
393 struct btrfs_root
*new_root
;
394 struct btrfs_block_rsv block_rsv
;
395 struct timespec cur_time
= CURRENT_TIME
;
400 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
405 ret
= btrfs_find_free_objectid(root
->fs_info
->tree_root
, &objectid
);
409 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
411 * The same as the snapshot creation, please see the comment
412 * of create_snapshot().
414 ret
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
415 8, &qgroup_reserved
, false);
419 trans
= btrfs_start_transaction(root
, 0);
421 ret
= PTR_ERR(trans
);
424 trans
->block_rsv
= &block_rsv
;
425 trans
->bytes_reserved
= block_rsv
.size
;
427 ret
= btrfs_qgroup_inherit(trans
, root
->fs_info
, 0, objectid
, inherit
);
431 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
432 0, objectid
, NULL
, 0, 0, 0);
438 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
439 btrfs_set_header_bytenr(leaf
, leaf
->start
);
440 btrfs_set_header_generation(leaf
, trans
->transid
);
441 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
442 btrfs_set_header_owner(leaf
, objectid
);
444 write_extent_buffer(leaf
, root
->fs_info
->fsid
, btrfs_header_fsid(),
446 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
447 btrfs_header_chunk_tree_uuid(leaf
),
449 btrfs_mark_buffer_dirty(leaf
);
451 memset(&root_item
, 0, sizeof(root_item
));
453 inode_item
= &root_item
.inode
;
454 btrfs_set_stack_inode_generation(inode_item
, 1);
455 btrfs_set_stack_inode_size(inode_item
, 3);
456 btrfs_set_stack_inode_nlink(inode_item
, 1);
457 btrfs_set_stack_inode_nbytes(inode_item
, root
->leafsize
);
458 btrfs_set_stack_inode_mode(inode_item
, S_IFDIR
| 0755);
460 btrfs_set_root_flags(&root_item
, 0);
461 btrfs_set_root_limit(&root_item
, 0);
462 btrfs_set_stack_inode_flags(inode_item
, BTRFS_INODE_ROOT_ITEM_INIT
);
464 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
465 btrfs_set_root_generation(&root_item
, trans
->transid
);
466 btrfs_set_root_level(&root_item
, 0);
467 btrfs_set_root_refs(&root_item
, 1);
468 btrfs_set_root_used(&root_item
, leaf
->len
);
469 btrfs_set_root_last_snapshot(&root_item
, 0);
471 btrfs_set_root_generation_v2(&root_item
,
472 btrfs_root_generation(&root_item
));
473 uuid_le_gen(&new_uuid
);
474 memcpy(root_item
.uuid
, new_uuid
.b
, BTRFS_UUID_SIZE
);
475 btrfs_set_stack_timespec_sec(&root_item
.otime
, cur_time
.tv_sec
);
476 btrfs_set_stack_timespec_nsec(&root_item
.otime
, cur_time
.tv_nsec
);
477 root_item
.ctime
= root_item
.otime
;
478 btrfs_set_root_ctransid(&root_item
, trans
->transid
);
479 btrfs_set_root_otransid(&root_item
, trans
->transid
);
481 btrfs_tree_unlock(leaf
);
482 free_extent_buffer(leaf
);
485 btrfs_set_root_dirid(&root_item
, new_dirid
);
487 key
.objectid
= objectid
;
489 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
490 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
495 key
.offset
= (u64
)-1;
496 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
497 if (IS_ERR(new_root
)) {
498 btrfs_abort_transaction(trans
, root
, PTR_ERR(new_root
));
499 ret
= PTR_ERR(new_root
);
503 btrfs_record_root_in_trans(trans
, new_root
);
505 ret
= btrfs_create_subvol_root(trans
, new_root
, new_dirid
);
507 /* We potentially lose an unused inode item here */
508 btrfs_abort_transaction(trans
, root
, ret
);
513 * insert the directory item
515 ret
= btrfs_set_inode_index(dir
, &index
);
517 btrfs_abort_transaction(trans
, root
, ret
);
521 ret
= btrfs_insert_dir_item(trans
, root
,
522 name
, namelen
, dir
, &key
,
523 BTRFS_FT_DIR
, index
);
525 btrfs_abort_transaction(trans
, root
, ret
);
529 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
530 ret
= btrfs_update_inode(trans
, root
, dir
);
533 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
534 objectid
, root
->root_key
.objectid
,
535 btrfs_ino(dir
), index
, name
, namelen
);
538 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
539 root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
542 btrfs_abort_transaction(trans
, root
, ret
);
545 trans
->block_rsv
= NULL
;
546 trans
->bytes_reserved
= 0;
548 *async_transid
= trans
->transid
;
549 err
= btrfs_commit_transaction_async(trans
, root
, 1);
551 err
= btrfs_commit_transaction(trans
, root
);
553 err
= btrfs_commit_transaction(trans
, root
);
559 inode
= btrfs_lookup_dentry(dir
, dentry
);
561 ret
= PTR_ERR(inode
);
564 d_instantiate(dentry
, inode
);
567 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
571 static int create_snapshot(struct btrfs_root
*root
, struct inode
*dir
,
572 struct dentry
*dentry
, char *name
, int namelen
,
573 u64
*async_transid
, bool readonly
,
574 struct btrfs_qgroup_inherit
*inherit
)
577 struct btrfs_pending_snapshot
*pending_snapshot
;
578 struct btrfs_trans_handle
*trans
;
584 ret
= btrfs_start_delalloc_inodes(root
, 0);
588 btrfs_wait_ordered_extents(root
, -1);
590 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
591 if (!pending_snapshot
)
594 btrfs_init_block_rsv(&pending_snapshot
->block_rsv
,
595 BTRFS_BLOCK_RSV_TEMP
);
597 * 1 - parent dir inode
600 * 2 - root ref/backref
601 * 1 - root of snapshot
604 ret
= btrfs_subvolume_reserve_metadata(BTRFS_I(dir
)->root
,
605 &pending_snapshot
->block_rsv
, 8,
606 &pending_snapshot
->qgroup_reserved
,
611 pending_snapshot
->dentry
= dentry
;
612 pending_snapshot
->root
= root
;
613 pending_snapshot
->readonly
= readonly
;
614 pending_snapshot
->dir
= dir
;
615 pending_snapshot
->inherit
= inherit
;
617 trans
= btrfs_start_transaction(root
, 0);
619 ret
= PTR_ERR(trans
);
623 spin_lock(&root
->fs_info
->trans_lock
);
624 list_add(&pending_snapshot
->list
,
625 &trans
->transaction
->pending_snapshots
);
626 spin_unlock(&root
->fs_info
->trans_lock
);
628 *async_transid
= trans
->transid
;
629 ret
= btrfs_commit_transaction_async(trans
,
630 root
->fs_info
->extent_root
, 1);
632 ret
= btrfs_commit_transaction(trans
, root
);
634 ret
= btrfs_commit_transaction(trans
,
635 root
->fs_info
->extent_root
);
640 ret
= pending_snapshot
->error
;
644 ret
= btrfs_orphan_cleanup(pending_snapshot
->snap
);
648 inode
= btrfs_lookup_dentry(dentry
->d_parent
->d_inode
, dentry
);
650 ret
= PTR_ERR(inode
);
654 d_instantiate(dentry
, inode
);
657 btrfs_subvolume_release_metadata(BTRFS_I(dir
)->root
,
658 &pending_snapshot
->block_rsv
,
659 pending_snapshot
->qgroup_reserved
);
661 kfree(pending_snapshot
);
665 /* copy of check_sticky in fs/namei.c()
666 * It's inline, so penalty for filesystems that don't use sticky bit is
669 static inline int btrfs_check_sticky(struct inode
*dir
, struct inode
*inode
)
671 kuid_t fsuid
= current_fsuid();
673 if (!(dir
->i_mode
& S_ISVTX
))
675 if (uid_eq(inode
->i_uid
, fsuid
))
677 if (uid_eq(dir
->i_uid
, fsuid
))
679 return !capable(CAP_FOWNER
);
682 /* copy of may_delete in fs/namei.c()
683 * Check whether we can remove a link victim from directory dir, check
684 * whether the type of victim is right.
685 * 1. We can't do it if dir is read-only (done in permission())
686 * 2. We should have write and exec permissions on dir
687 * 3. We can't remove anything from append-only dir
688 * 4. We can't do anything with immutable dir (done in permission())
689 * 5. If the sticky bit on dir is set we should either
690 * a. be owner of dir, or
691 * b. be owner of victim, or
692 * c. have CAP_FOWNER capability
693 * 6. If the victim is append-only or immutable we can't do antyhing with
694 * links pointing to it.
695 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
696 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
697 * 9. We can't remove a root or mountpoint.
698 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
699 * nfs_async_unlink().
702 static int btrfs_may_delete(struct inode
*dir
, struct dentry
*victim
, int isdir
)
706 if (!victim
->d_inode
)
709 BUG_ON(victim
->d_parent
->d_inode
!= dir
);
710 audit_inode_child(dir
, victim
, AUDIT_TYPE_CHILD_DELETE
);
712 error
= inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
717 if (btrfs_check_sticky(dir
, victim
->d_inode
)||
718 IS_APPEND(victim
->d_inode
)||
719 IS_IMMUTABLE(victim
->d_inode
) || IS_SWAPFILE(victim
->d_inode
))
722 if (!S_ISDIR(victim
->d_inode
->i_mode
))
726 } else if (S_ISDIR(victim
->d_inode
->i_mode
))
730 if (victim
->d_flags
& DCACHE_NFSFS_RENAMED
)
735 /* copy of may_create in fs/namei.c() */
736 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
742 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
746 * Create a new subvolume below @parent. This is largely modeled after
747 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
748 * inside this filesystem so it's quite a bit simpler.
750 static noinline
int btrfs_mksubvol(struct path
*parent
,
751 char *name
, int namelen
,
752 struct btrfs_root
*snap_src
,
753 u64
*async_transid
, bool readonly
,
754 struct btrfs_qgroup_inherit
*inherit
)
756 struct inode
*dir
= parent
->dentry
->d_inode
;
757 struct dentry
*dentry
;
760 error
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
764 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
765 error
= PTR_ERR(dentry
);
773 error
= btrfs_may_create(dir
, dentry
);
778 * even if this name doesn't exist, we may get hash collisions.
779 * check for them now when we can safely fail
781 error
= btrfs_check_dir_item_collision(BTRFS_I(dir
)->root
,
787 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
789 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
793 error
= create_snapshot(snap_src
, dir
, dentry
, name
, namelen
,
794 async_transid
, readonly
, inherit
);
796 error
= create_subvol(dir
, dentry
, name
, namelen
,
797 async_transid
, inherit
);
800 fsnotify_mkdir(dir
, dentry
);
802 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
806 mutex_unlock(&dir
->i_mutex
);
811 * When we're defragging a range, we don't want to kick it off again
812 * if it is really just waiting for delalloc to send it down.
813 * If we find a nice big extent or delalloc range for the bytes in the
814 * file you want to defrag, we return 0 to let you know to skip this
817 static int check_defrag_in_cache(struct inode
*inode
, u64 offset
, int thresh
)
819 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
820 struct extent_map
*em
= NULL
;
821 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
824 read_lock(&em_tree
->lock
);
825 em
= lookup_extent_mapping(em_tree
, offset
, PAGE_CACHE_SIZE
);
826 read_unlock(&em_tree
->lock
);
829 end
= extent_map_end(em
);
831 if (end
- offset
> thresh
)
834 /* if we already have a nice delalloc here, just stop */
836 end
= count_range_bits(io_tree
, &offset
, offset
+ thresh
,
837 thresh
, EXTENT_DELALLOC
, 1);
844 * helper function to walk through a file and find extents
845 * newer than a specific transid, and smaller than thresh.
847 * This is used by the defragging code to find new and small
850 static int find_new_extents(struct btrfs_root
*root
,
851 struct inode
*inode
, u64 newer_than
,
852 u64
*off
, int thresh
)
854 struct btrfs_path
*path
;
855 struct btrfs_key min_key
;
856 struct extent_buffer
*leaf
;
857 struct btrfs_file_extent_item
*extent
;
860 u64 ino
= btrfs_ino(inode
);
862 path
= btrfs_alloc_path();
866 min_key
.objectid
= ino
;
867 min_key
.type
= BTRFS_EXTENT_DATA_KEY
;
868 min_key
.offset
= *off
;
870 path
->keep_locks
= 1;
873 ret
= btrfs_search_forward(root
, &min_key
, path
, newer_than
);
876 if (min_key
.objectid
!= ino
)
878 if (min_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
881 leaf
= path
->nodes
[0];
882 extent
= btrfs_item_ptr(leaf
, path
->slots
[0],
883 struct btrfs_file_extent_item
);
885 type
= btrfs_file_extent_type(leaf
, extent
);
886 if (type
== BTRFS_FILE_EXTENT_REG
&&
887 btrfs_file_extent_num_bytes(leaf
, extent
) < thresh
&&
888 check_defrag_in_cache(inode
, min_key
.offset
, thresh
)) {
889 *off
= min_key
.offset
;
890 btrfs_free_path(path
);
894 if (min_key
.offset
== (u64
)-1)
898 btrfs_release_path(path
);
901 btrfs_free_path(path
);
905 static struct extent_map
*defrag_lookup_extent(struct inode
*inode
, u64 start
)
907 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
908 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
909 struct extent_map
*em
;
910 u64 len
= PAGE_CACHE_SIZE
;
913 * hopefully we have this extent in the tree already, try without
914 * the full extent lock
916 read_lock(&em_tree
->lock
);
917 em
= lookup_extent_mapping(em_tree
, start
, len
);
918 read_unlock(&em_tree
->lock
);
921 /* get the big lock and read metadata off disk */
922 lock_extent(io_tree
, start
, start
+ len
- 1);
923 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
924 unlock_extent(io_tree
, start
, start
+ len
- 1);
933 static bool defrag_check_next_extent(struct inode
*inode
, struct extent_map
*em
)
935 struct extent_map
*next
;
938 /* this is the last extent */
939 if (em
->start
+ em
->len
>= i_size_read(inode
))
942 next
= defrag_lookup_extent(inode
, em
->start
+ em
->len
);
943 if (!next
|| next
->block_start
>= EXTENT_MAP_LAST_BYTE
)
946 free_extent_map(next
);
950 static int should_defrag_range(struct inode
*inode
, u64 start
, int thresh
,
951 u64
*last_len
, u64
*skip
, u64
*defrag_end
,
954 struct extent_map
*em
;
956 bool next_mergeable
= true;
959 * make sure that once we start defragging an extent, we keep on
962 if (start
< *defrag_end
)
967 em
= defrag_lookup_extent(inode
, start
);
971 /* this will cover holes, and inline extents */
972 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
977 next_mergeable
= defrag_check_next_extent(inode
, em
);
980 * we hit a real extent, if it is big or the next extent is not a
981 * real extent, don't bother defragging it
983 if (!compress
&& (*last_len
== 0 || *last_len
>= thresh
) &&
984 (em
->len
>= thresh
|| !next_mergeable
))
988 * last_len ends up being a counter of how many bytes we've defragged.
989 * every time we choose not to defrag an extent, we reset *last_len
990 * so that the next tiny extent will force a defrag.
992 * The end result of this is that tiny extents before a single big
993 * extent will force at least part of that big extent to be defragged.
996 *defrag_end
= extent_map_end(em
);
999 *skip
= extent_map_end(em
);
1003 free_extent_map(em
);
1008 * it doesn't do much good to defrag one or two pages
1009 * at a time. This pulls in a nice chunk of pages
1010 * to COW and defrag.
1012 * It also makes sure the delalloc code has enough
1013 * dirty data to avoid making new small extents as part
1016 * It's a good idea to start RA on this range
1017 * before calling this.
1019 static int cluster_pages_for_defrag(struct inode
*inode
,
1020 struct page
**pages
,
1021 unsigned long start_index
,
1024 unsigned long file_end
;
1025 u64 isize
= i_size_read(inode
);
1032 struct btrfs_ordered_extent
*ordered
;
1033 struct extent_state
*cached_state
= NULL
;
1034 struct extent_io_tree
*tree
;
1035 gfp_t mask
= btrfs_alloc_write_mask(inode
->i_mapping
);
1037 file_end
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1038 if (!isize
|| start_index
> file_end
)
1041 page_cnt
= min_t(u64
, (u64
)num_pages
, (u64
)file_end
- start_index
+ 1);
1043 ret
= btrfs_delalloc_reserve_space(inode
,
1044 page_cnt
<< PAGE_CACHE_SHIFT
);
1048 tree
= &BTRFS_I(inode
)->io_tree
;
1050 /* step one, lock all the pages */
1051 for (i
= 0; i
< page_cnt
; i
++) {
1054 page
= find_or_create_page(inode
->i_mapping
,
1055 start_index
+ i
, mask
);
1059 page_start
= page_offset(page
);
1060 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1062 lock_extent(tree
, page_start
, page_end
);
1063 ordered
= btrfs_lookup_ordered_extent(inode
,
1065 unlock_extent(tree
, page_start
, page_end
);
1070 btrfs_start_ordered_extent(inode
, ordered
, 1);
1071 btrfs_put_ordered_extent(ordered
);
1074 * we unlocked the page above, so we need check if
1075 * it was released or not.
1077 if (page
->mapping
!= inode
->i_mapping
) {
1079 page_cache_release(page
);
1084 if (!PageUptodate(page
)) {
1085 btrfs_readpage(NULL
, page
);
1087 if (!PageUptodate(page
)) {
1089 page_cache_release(page
);
1095 if (page
->mapping
!= inode
->i_mapping
) {
1097 page_cache_release(page
);
1107 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1111 * so now we have a nice long stream of locked
1112 * and up to date pages, lets wait on them
1114 for (i
= 0; i
< i_done
; i
++)
1115 wait_on_page_writeback(pages
[i
]);
1117 page_start
= page_offset(pages
[0]);
1118 page_end
= page_offset(pages
[i_done
- 1]) + PAGE_CACHE_SIZE
;
1120 lock_extent_bits(&BTRFS_I(inode
)->io_tree
,
1121 page_start
, page_end
- 1, 0, &cached_state
);
1122 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
,
1123 page_end
- 1, EXTENT_DIRTY
| EXTENT_DELALLOC
|
1124 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 0, 0,
1125 &cached_state
, GFP_NOFS
);
1127 if (i_done
!= page_cnt
) {
1128 spin_lock(&BTRFS_I(inode
)->lock
);
1129 BTRFS_I(inode
)->outstanding_extents
++;
1130 spin_unlock(&BTRFS_I(inode
)->lock
);
1131 btrfs_delalloc_release_space(inode
,
1132 (page_cnt
- i_done
) << PAGE_CACHE_SHIFT
);
1136 set_extent_defrag(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
- 1,
1137 &cached_state
, GFP_NOFS
);
1139 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
1140 page_start
, page_end
- 1, &cached_state
,
1143 for (i
= 0; i
< i_done
; i
++) {
1144 clear_page_dirty_for_io(pages
[i
]);
1145 ClearPageChecked(pages
[i
]);
1146 set_page_extent_mapped(pages
[i
]);
1147 set_page_dirty(pages
[i
]);
1148 unlock_page(pages
[i
]);
1149 page_cache_release(pages
[i
]);
1153 for (i
= 0; i
< i_done
; i
++) {
1154 unlock_page(pages
[i
]);
1155 page_cache_release(pages
[i
]);
1157 btrfs_delalloc_release_space(inode
, page_cnt
<< PAGE_CACHE_SHIFT
);
1162 int btrfs_defrag_file(struct inode
*inode
, struct file
*file
,
1163 struct btrfs_ioctl_defrag_range_args
*range
,
1164 u64 newer_than
, unsigned long max_to_defrag
)
1166 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1167 struct file_ra_state
*ra
= NULL
;
1168 unsigned long last_index
;
1169 u64 isize
= i_size_read(inode
);
1173 u64 newer_off
= range
->start
;
1175 unsigned long ra_index
= 0;
1177 int defrag_count
= 0;
1178 int compress_type
= BTRFS_COMPRESS_ZLIB
;
1179 int extent_thresh
= range
->extent_thresh
;
1180 int max_cluster
= (256 * 1024) >> PAGE_CACHE_SHIFT
;
1181 int cluster
= max_cluster
;
1182 u64 new_align
= ~((u64
)128 * 1024 - 1);
1183 struct page
**pages
= NULL
;
1188 if (range
->start
>= isize
)
1191 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1192 if (range
->compress_type
> BTRFS_COMPRESS_TYPES
)
1194 if (range
->compress_type
)
1195 compress_type
= range
->compress_type
;
1198 if (extent_thresh
== 0)
1199 extent_thresh
= 256 * 1024;
1202 * if we were not given a file, allocate a readahead
1206 ra
= kzalloc(sizeof(*ra
), GFP_NOFS
);
1209 file_ra_state_init(ra
, inode
->i_mapping
);
1214 pages
= kmalloc_array(max_cluster
, sizeof(struct page
*),
1221 /* find the last page to defrag */
1222 if (range
->start
+ range
->len
> range
->start
) {
1223 last_index
= min_t(u64
, isize
- 1,
1224 range
->start
+ range
->len
- 1) >> PAGE_CACHE_SHIFT
;
1226 last_index
= (isize
- 1) >> PAGE_CACHE_SHIFT
;
1230 ret
= find_new_extents(root
, inode
, newer_than
,
1231 &newer_off
, 64 * 1024);
1233 range
->start
= newer_off
;
1235 * we always align our defrag to help keep
1236 * the extents in the file evenly spaced
1238 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1242 i
= range
->start
>> PAGE_CACHE_SHIFT
;
1245 max_to_defrag
= last_index
+ 1;
1248 * make writeback starts from i, so the defrag range can be
1249 * written sequentially.
1251 if (i
< inode
->i_mapping
->writeback_index
)
1252 inode
->i_mapping
->writeback_index
= i
;
1254 while (i
<= last_index
&& defrag_count
< max_to_defrag
&&
1255 (i
< (i_size_read(inode
) + PAGE_CACHE_SIZE
- 1) >>
1256 PAGE_CACHE_SHIFT
)) {
1258 * make sure we stop running if someone unmounts
1261 if (!(inode
->i_sb
->s_flags
& MS_ACTIVE
))
1264 if (btrfs_defrag_cancelled(root
->fs_info
)) {
1265 printk(KERN_DEBUG
"BTRFS: defrag_file cancelled\n");
1270 if (!should_defrag_range(inode
, (u64
)i
<< PAGE_CACHE_SHIFT
,
1271 extent_thresh
, &last_len
, &skip
,
1272 &defrag_end
, range
->flags
&
1273 BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1276 * the should_defrag function tells us how much to skip
1277 * bump our counter by the suggested amount
1279 next
= (skip
+ PAGE_CACHE_SIZE
- 1) >> PAGE_CACHE_SHIFT
;
1280 i
= max(i
+ 1, next
);
1285 cluster
= (PAGE_CACHE_ALIGN(defrag_end
) >>
1286 PAGE_CACHE_SHIFT
) - i
;
1287 cluster
= min(cluster
, max_cluster
);
1289 cluster
= max_cluster
;
1292 if (i
+ cluster
> ra_index
) {
1293 ra_index
= max(i
, ra_index
);
1294 btrfs_force_ra(inode
->i_mapping
, ra
, file
, ra_index
,
1296 ra_index
+= max_cluster
;
1299 mutex_lock(&inode
->i_mutex
);
1300 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)
1301 BTRFS_I(inode
)->force_compress
= compress_type
;
1302 ret
= cluster_pages_for_defrag(inode
, pages
, i
, cluster
);
1304 mutex_unlock(&inode
->i_mutex
);
1308 defrag_count
+= ret
;
1309 balance_dirty_pages_ratelimited(inode
->i_mapping
);
1310 mutex_unlock(&inode
->i_mutex
);
1313 if (newer_off
== (u64
)-1)
1319 newer_off
= max(newer_off
+ 1,
1320 (u64
)i
<< PAGE_CACHE_SHIFT
);
1322 ret
= find_new_extents(root
, inode
,
1323 newer_than
, &newer_off
,
1326 range
->start
= newer_off
;
1327 i
= (newer_off
& new_align
) >> PAGE_CACHE_SHIFT
;
1334 last_len
+= ret
<< PAGE_CACHE_SHIFT
;
1342 if ((range
->flags
& BTRFS_DEFRAG_RANGE_START_IO
))
1343 filemap_flush(inode
->i_mapping
);
1345 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
1346 /* the filemap_flush will queue IO into the worker threads, but
1347 * we have to make sure the IO is actually started and that
1348 * ordered extents get created before we return
1350 atomic_inc(&root
->fs_info
->async_submit_draining
);
1351 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
1352 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1353 wait_event(root
->fs_info
->async_submit_wait
,
1354 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
1355 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
1357 atomic_dec(&root
->fs_info
->async_submit_draining
);
1360 if (range
->compress_type
== BTRFS_COMPRESS_LZO
) {
1361 btrfs_set_fs_incompat(root
->fs_info
, COMPRESS_LZO
);
1367 if (range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
) {
1368 mutex_lock(&inode
->i_mutex
);
1369 BTRFS_I(inode
)->force_compress
= BTRFS_COMPRESS_NONE
;
1370 mutex_unlock(&inode
->i_mutex
);
1378 static noinline
int btrfs_ioctl_resize(struct file
*file
,
1384 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
1385 struct btrfs_ioctl_vol_args
*vol_args
;
1386 struct btrfs_trans_handle
*trans
;
1387 struct btrfs_device
*device
= NULL
;
1389 char *devstr
= NULL
;
1393 if (!capable(CAP_SYS_ADMIN
))
1396 ret
= mnt_want_write_file(file
);
1400 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
1402 mnt_drop_write_file(file
);
1403 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
1406 mutex_lock(&root
->fs_info
->volume_mutex
);
1407 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1408 if (IS_ERR(vol_args
)) {
1409 ret
= PTR_ERR(vol_args
);
1413 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1415 sizestr
= vol_args
->name
;
1416 devstr
= strchr(sizestr
, ':');
1419 sizestr
= devstr
+ 1;
1421 devstr
= vol_args
->name
;
1422 devid
= simple_strtoull(devstr
, &end
, 10);
1427 btrfs_info(root
->fs_info
, "resizing devid %llu", devid
);
1430 device
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
1432 btrfs_info(root
->fs_info
, "resizer unable to find device %llu",
1438 if (!device
->writeable
) {
1439 btrfs_info(root
->fs_info
,
1440 "resizer unable to apply on readonly device %llu",
1446 if (!strcmp(sizestr
, "max"))
1447 new_size
= device
->bdev
->bd_inode
->i_size
;
1449 if (sizestr
[0] == '-') {
1452 } else if (sizestr
[0] == '+') {
1456 new_size
= memparse(sizestr
, NULL
);
1457 if (new_size
== 0) {
1463 if (device
->is_tgtdev_for_dev_replace
) {
1468 old_size
= device
->total_bytes
;
1471 if (new_size
> old_size
) {
1475 new_size
= old_size
- new_size
;
1476 } else if (mod
> 0) {
1477 new_size
= old_size
+ new_size
;
1480 if (new_size
< 256 * 1024 * 1024) {
1484 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
1489 do_div(new_size
, root
->sectorsize
);
1490 new_size
*= root
->sectorsize
;
1492 printk_in_rcu(KERN_INFO
"BTRFS: new size for %s is %llu\n",
1493 rcu_str_deref(device
->name
), new_size
);
1495 if (new_size
> old_size
) {
1496 trans
= btrfs_start_transaction(root
, 0);
1497 if (IS_ERR(trans
)) {
1498 ret
= PTR_ERR(trans
);
1501 ret
= btrfs_grow_device(trans
, device
, new_size
);
1502 btrfs_commit_transaction(trans
, root
);
1503 } else if (new_size
< old_size
) {
1504 ret
= btrfs_shrink_device(device
, new_size
);
1505 } /* equal, nothing need to do */
1510 mutex_unlock(&root
->fs_info
->volume_mutex
);
1511 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
1512 mnt_drop_write_file(file
);
1516 static noinline
int btrfs_ioctl_snap_create_transid(struct file
*file
,
1517 char *name
, unsigned long fd
, int subvol
,
1518 u64
*transid
, bool readonly
,
1519 struct btrfs_qgroup_inherit
*inherit
)
1524 ret
= mnt_want_write_file(file
);
1528 namelen
= strlen(name
);
1529 if (strchr(name
, '/')) {
1531 goto out_drop_write
;
1534 if (name
[0] == '.' &&
1535 (namelen
== 1 || (name
[1] == '.' && namelen
== 2))) {
1537 goto out_drop_write
;
1541 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1542 NULL
, transid
, readonly
, inherit
);
1544 struct fd src
= fdget(fd
);
1545 struct inode
*src_inode
;
1548 goto out_drop_write
;
1551 src_inode
= file_inode(src
.file
);
1552 if (src_inode
->i_sb
!= file_inode(file
)->i_sb
) {
1553 btrfs_info(BTRFS_I(src_inode
)->root
->fs_info
,
1554 "Snapshot src from another FS");
1557 ret
= btrfs_mksubvol(&file
->f_path
, name
, namelen
,
1558 BTRFS_I(src_inode
)->root
,
1559 transid
, readonly
, inherit
);
1564 mnt_drop_write_file(file
);
1569 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
1570 void __user
*arg
, int subvol
)
1572 struct btrfs_ioctl_vol_args
*vol_args
;
1575 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1576 if (IS_ERR(vol_args
))
1577 return PTR_ERR(vol_args
);
1578 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
1580 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1581 vol_args
->fd
, subvol
,
1588 static noinline
int btrfs_ioctl_snap_create_v2(struct file
*file
,
1589 void __user
*arg
, int subvol
)
1591 struct btrfs_ioctl_vol_args_v2
*vol_args
;
1595 bool readonly
= false;
1596 struct btrfs_qgroup_inherit
*inherit
= NULL
;
1598 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
1599 if (IS_ERR(vol_args
))
1600 return PTR_ERR(vol_args
);
1601 vol_args
->name
[BTRFS_SUBVOL_NAME_MAX
] = '\0';
1603 if (vol_args
->flags
&
1604 ~(BTRFS_SUBVOL_CREATE_ASYNC
| BTRFS_SUBVOL_RDONLY
|
1605 BTRFS_SUBVOL_QGROUP_INHERIT
)) {
1610 if (vol_args
->flags
& BTRFS_SUBVOL_CREATE_ASYNC
)
1612 if (vol_args
->flags
& BTRFS_SUBVOL_RDONLY
)
1614 if (vol_args
->flags
& BTRFS_SUBVOL_QGROUP_INHERIT
) {
1615 if (vol_args
->size
> PAGE_CACHE_SIZE
) {
1619 inherit
= memdup_user(vol_args
->qgroup_inherit
, vol_args
->size
);
1620 if (IS_ERR(inherit
)) {
1621 ret
= PTR_ERR(inherit
);
1626 ret
= btrfs_ioctl_snap_create_transid(file
, vol_args
->name
,
1627 vol_args
->fd
, subvol
, ptr
,
1630 if (ret
== 0 && ptr
&&
1632 offsetof(struct btrfs_ioctl_vol_args_v2
,
1633 transid
), ptr
, sizeof(*ptr
)))
1641 static noinline
int btrfs_ioctl_subvol_getflags(struct file
*file
,
1644 struct inode
*inode
= file_inode(file
);
1645 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1649 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
)
1652 down_read(&root
->fs_info
->subvol_sem
);
1653 if (btrfs_root_readonly(root
))
1654 flags
|= BTRFS_SUBVOL_RDONLY
;
1655 up_read(&root
->fs_info
->subvol_sem
);
1657 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
1663 static noinline
int btrfs_ioctl_subvol_setflags(struct file
*file
,
1666 struct inode
*inode
= file_inode(file
);
1667 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1668 struct btrfs_trans_handle
*trans
;
1673 ret
= mnt_want_write_file(file
);
1677 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
1679 goto out_drop_write
;
1682 if (copy_from_user(&flags
, arg
, sizeof(flags
))) {
1684 goto out_drop_write
;
1687 if (flags
& BTRFS_SUBVOL_CREATE_ASYNC
) {
1689 goto out_drop_write
;
1692 if (flags
& ~BTRFS_SUBVOL_RDONLY
) {
1694 goto out_drop_write
;
1697 if (!inode_owner_or_capable(inode
)) {
1699 goto out_drop_write
;
1702 down_write(&root
->fs_info
->subvol_sem
);
1705 if (!!(flags
& BTRFS_SUBVOL_RDONLY
) == btrfs_root_readonly(root
))
1708 root_flags
= btrfs_root_flags(&root
->root_item
);
1709 if (flags
& BTRFS_SUBVOL_RDONLY
) {
1710 btrfs_set_root_flags(&root
->root_item
,
1711 root_flags
| BTRFS_ROOT_SUBVOL_RDONLY
);
1714 * Block RO -> RW transition if this subvolume is involved in
1717 spin_lock(&root
->root_item_lock
);
1718 if (root
->send_in_progress
== 0) {
1719 btrfs_set_root_flags(&root
->root_item
,
1720 root_flags
& ~BTRFS_ROOT_SUBVOL_RDONLY
);
1721 spin_unlock(&root
->root_item_lock
);
1723 spin_unlock(&root
->root_item_lock
);
1724 btrfs_warn(root
->fs_info
,
1725 "Attempt to set subvolume %llu read-write during send",
1726 root
->root_key
.objectid
);
1732 trans
= btrfs_start_transaction(root
, 1);
1733 if (IS_ERR(trans
)) {
1734 ret
= PTR_ERR(trans
);
1738 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
1739 &root
->root_key
, &root
->root_item
);
1741 btrfs_commit_transaction(trans
, root
);
1744 btrfs_set_root_flags(&root
->root_item
, root_flags
);
1746 up_write(&root
->fs_info
->subvol_sem
);
1748 mnt_drop_write_file(file
);
1754 * helper to check if the subvolume references other subvolumes
1756 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
1758 struct btrfs_path
*path
;
1759 struct btrfs_dir_item
*di
;
1760 struct btrfs_key key
;
1764 path
= btrfs_alloc_path();
1768 /* Make sure this root isn't set as the default subvol */
1769 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
1770 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
, path
,
1771 dir_id
, "default", 7, 0);
1772 if (di
&& !IS_ERR(di
)) {
1773 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
1774 if (key
.objectid
== root
->root_key
.objectid
) {
1778 btrfs_release_path(path
);
1781 key
.objectid
= root
->root_key
.objectid
;
1782 key
.type
= BTRFS_ROOT_REF_KEY
;
1783 key
.offset
= (u64
)-1;
1785 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
1792 if (path
->slots
[0] > 0) {
1794 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
1795 if (key
.objectid
== root
->root_key
.objectid
&&
1796 key
.type
== BTRFS_ROOT_REF_KEY
)
1800 btrfs_free_path(path
);
1804 static noinline
int key_in_sk(struct btrfs_key
*key
,
1805 struct btrfs_ioctl_search_key
*sk
)
1807 struct btrfs_key test
;
1810 test
.objectid
= sk
->min_objectid
;
1811 test
.type
= sk
->min_type
;
1812 test
.offset
= sk
->min_offset
;
1814 ret
= btrfs_comp_cpu_keys(key
, &test
);
1818 test
.objectid
= sk
->max_objectid
;
1819 test
.type
= sk
->max_type
;
1820 test
.offset
= sk
->max_offset
;
1822 ret
= btrfs_comp_cpu_keys(key
, &test
);
1828 static noinline
int copy_to_sk(struct btrfs_root
*root
,
1829 struct btrfs_path
*path
,
1830 struct btrfs_key
*key
,
1831 struct btrfs_ioctl_search_key
*sk
,
1833 unsigned long *sk_offset
,
1837 struct extent_buffer
*leaf
;
1838 struct btrfs_ioctl_search_header sh
;
1839 unsigned long item_off
;
1840 unsigned long item_len
;
1846 leaf
= path
->nodes
[0];
1847 slot
= path
->slots
[0];
1848 nritems
= btrfs_header_nritems(leaf
);
1850 if (btrfs_header_generation(leaf
) > sk
->max_transid
) {
1854 found_transid
= btrfs_header_generation(leaf
);
1856 for (i
= slot
; i
< nritems
; i
++) {
1857 item_off
= btrfs_item_ptr_offset(leaf
, i
);
1858 item_len
= btrfs_item_size_nr(leaf
, i
);
1860 btrfs_item_key_to_cpu(leaf
, key
, i
);
1861 if (!key_in_sk(key
, sk
))
1864 if (sizeof(sh
) + item_len
> BTRFS_SEARCH_ARGS_BUFSIZE
)
1867 if (sizeof(sh
) + item_len
+ *sk_offset
>
1868 BTRFS_SEARCH_ARGS_BUFSIZE
) {
1873 sh
.objectid
= key
->objectid
;
1874 sh
.offset
= key
->offset
;
1875 sh
.type
= key
->type
;
1877 sh
.transid
= found_transid
;
1879 /* copy search result header */
1880 memcpy(buf
+ *sk_offset
, &sh
, sizeof(sh
));
1881 *sk_offset
+= sizeof(sh
);
1884 char *p
= buf
+ *sk_offset
;
1886 read_extent_buffer(leaf
, p
,
1887 item_off
, item_len
);
1888 *sk_offset
+= item_len
;
1892 if (*num_found
>= sk
->nr_items
)
1897 if (key
->offset
< (u64
)-1 && key
->offset
< sk
->max_offset
)
1899 else if (key
->type
< (u8
)-1 && key
->type
< sk
->max_type
) {
1902 } else if (key
->objectid
< (u64
)-1 && key
->objectid
< sk
->max_objectid
) {
1912 static noinline
int search_ioctl(struct inode
*inode
,
1913 struct btrfs_ioctl_search_args
*args
)
1915 struct btrfs_root
*root
;
1916 struct btrfs_key key
;
1917 struct btrfs_path
*path
;
1918 struct btrfs_ioctl_search_key
*sk
= &args
->key
;
1919 struct btrfs_fs_info
*info
= BTRFS_I(inode
)->root
->fs_info
;
1922 unsigned long sk_offset
= 0;
1924 path
= btrfs_alloc_path();
1928 if (sk
->tree_id
== 0) {
1929 /* search the root of the inode that was passed */
1930 root
= BTRFS_I(inode
)->root
;
1932 key
.objectid
= sk
->tree_id
;
1933 key
.type
= BTRFS_ROOT_ITEM_KEY
;
1934 key
.offset
= (u64
)-1;
1935 root
= btrfs_read_fs_root_no_name(info
, &key
);
1937 printk(KERN_ERR
"BTRFS: could not find root %llu\n",
1939 btrfs_free_path(path
);
1944 key
.objectid
= sk
->min_objectid
;
1945 key
.type
= sk
->min_type
;
1946 key
.offset
= sk
->min_offset
;
1948 path
->keep_locks
= 1;
1951 ret
= btrfs_search_forward(root
, &key
, path
, sk
->min_transid
);
1957 ret
= copy_to_sk(root
, path
, &key
, sk
, args
->buf
,
1958 &sk_offset
, &num_found
);
1959 btrfs_release_path(path
);
1960 if (ret
|| num_found
>= sk
->nr_items
)
1966 sk
->nr_items
= num_found
;
1967 btrfs_free_path(path
);
1971 static noinline
int btrfs_ioctl_tree_search(struct file
*file
,
1974 struct btrfs_ioctl_search_args
*args
;
1975 struct inode
*inode
;
1978 if (!capable(CAP_SYS_ADMIN
))
1981 args
= memdup_user(argp
, sizeof(*args
));
1983 return PTR_ERR(args
);
1985 inode
= file_inode(file
);
1986 ret
= search_ioctl(inode
, args
);
1987 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
1994 * Search INODE_REFs to identify path name of 'dirid' directory
1995 * in a 'tree_id' tree. and sets path name to 'name'.
1997 static noinline
int btrfs_search_path_in_tree(struct btrfs_fs_info
*info
,
1998 u64 tree_id
, u64 dirid
, char *name
)
2000 struct btrfs_root
*root
;
2001 struct btrfs_key key
;
2007 struct btrfs_inode_ref
*iref
;
2008 struct extent_buffer
*l
;
2009 struct btrfs_path
*path
;
2011 if (dirid
== BTRFS_FIRST_FREE_OBJECTID
) {
2016 path
= btrfs_alloc_path();
2020 ptr
= &name
[BTRFS_INO_LOOKUP_PATH_MAX
];
2022 key
.objectid
= tree_id
;
2023 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2024 key
.offset
= (u64
)-1;
2025 root
= btrfs_read_fs_root_no_name(info
, &key
);
2027 printk(KERN_ERR
"BTRFS: could not find root %llu\n", tree_id
);
2032 key
.objectid
= dirid
;
2033 key
.type
= BTRFS_INODE_REF_KEY
;
2034 key
.offset
= (u64
)-1;
2037 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2041 ret
= btrfs_previous_item(root
, path
, dirid
,
2042 BTRFS_INODE_REF_KEY
);
2052 slot
= path
->slots
[0];
2053 btrfs_item_key_to_cpu(l
, &key
, slot
);
2055 iref
= btrfs_item_ptr(l
, slot
, struct btrfs_inode_ref
);
2056 len
= btrfs_inode_ref_name_len(l
, iref
);
2058 total_len
+= len
+ 1;
2060 ret
= -ENAMETOOLONG
;
2065 read_extent_buffer(l
, ptr
, (unsigned long)(iref
+ 1), len
);
2067 if (key
.offset
== BTRFS_FIRST_FREE_OBJECTID
)
2070 btrfs_release_path(path
);
2071 key
.objectid
= key
.offset
;
2072 key
.offset
= (u64
)-1;
2073 dirid
= key
.objectid
;
2075 memmove(name
, ptr
, total_len
);
2076 name
[total_len
] = '\0';
2079 btrfs_free_path(path
);
2083 static noinline
int btrfs_ioctl_ino_lookup(struct file
*file
,
2086 struct btrfs_ioctl_ino_lookup_args
*args
;
2087 struct inode
*inode
;
2090 if (!capable(CAP_SYS_ADMIN
))
2093 args
= memdup_user(argp
, sizeof(*args
));
2095 return PTR_ERR(args
);
2097 inode
= file_inode(file
);
2099 if (args
->treeid
== 0)
2100 args
->treeid
= BTRFS_I(inode
)->root
->root_key
.objectid
;
2102 ret
= btrfs_search_path_in_tree(BTRFS_I(inode
)->root
->fs_info
,
2103 args
->treeid
, args
->objectid
,
2106 if (ret
== 0 && copy_to_user(argp
, args
, sizeof(*args
)))
2113 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
2116 struct dentry
*parent
= file
->f_path
.dentry
;
2117 struct dentry
*dentry
;
2118 struct inode
*dir
= parent
->d_inode
;
2119 struct inode
*inode
;
2120 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2121 struct btrfs_root
*dest
= NULL
;
2122 struct btrfs_ioctl_vol_args
*vol_args
;
2123 struct btrfs_trans_handle
*trans
;
2124 struct btrfs_block_rsv block_rsv
;
2125 u64 qgroup_reserved
;
2130 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2131 if (IS_ERR(vol_args
))
2132 return PTR_ERR(vol_args
);
2134 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2135 namelen
= strlen(vol_args
->name
);
2136 if (strchr(vol_args
->name
, '/') ||
2137 strncmp(vol_args
->name
, "..", namelen
) == 0) {
2142 err
= mnt_want_write_file(file
);
2146 err
= mutex_lock_killable_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
2148 goto out_drop_write
;
2149 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
2150 if (IS_ERR(dentry
)) {
2151 err
= PTR_ERR(dentry
);
2152 goto out_unlock_dir
;
2155 if (!dentry
->d_inode
) {
2160 inode
= dentry
->d_inode
;
2161 dest
= BTRFS_I(inode
)->root
;
2162 if (!capable(CAP_SYS_ADMIN
)) {
2164 * Regular user. Only allow this with a special mount
2165 * option, when the user has write+exec access to the
2166 * subvol root, and when rmdir(2) would have been
2169 * Note that this is _not_ check that the subvol is
2170 * empty or doesn't contain data that we wouldn't
2171 * otherwise be able to delete.
2173 * Users who want to delete empty subvols should try
2177 if (!btrfs_test_opt(root
, USER_SUBVOL_RM_ALLOWED
))
2181 * Do not allow deletion if the parent dir is the same
2182 * as the dir to be deleted. That means the ioctl
2183 * must be called on the dentry referencing the root
2184 * of the subvol, not a random directory contained
2191 err
= inode_permission(inode
, MAY_WRITE
| MAY_EXEC
);
2196 /* check if subvolume may be deleted by a user */
2197 err
= btrfs_may_delete(dir
, dentry
, 1);
2201 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
2206 mutex_lock(&inode
->i_mutex
);
2207 err
= d_invalidate(dentry
);
2211 down_write(&root
->fs_info
->subvol_sem
);
2213 err
= may_destroy_subvol(dest
);
2217 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
2219 * One for dir inode, two for dir entries, two for root
2222 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
,
2223 5, &qgroup_reserved
, true);
2227 trans
= btrfs_start_transaction(root
, 0);
2228 if (IS_ERR(trans
)) {
2229 err
= PTR_ERR(trans
);
2232 trans
->block_rsv
= &block_rsv
;
2233 trans
->bytes_reserved
= block_rsv
.size
;
2235 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
2236 dest
->root_key
.objectid
,
2237 dentry
->d_name
.name
,
2238 dentry
->d_name
.len
);
2241 btrfs_abort_transaction(trans
, root
, ret
);
2245 btrfs_record_root_in_trans(trans
, dest
);
2247 memset(&dest
->root_item
.drop_progress
, 0,
2248 sizeof(dest
->root_item
.drop_progress
));
2249 dest
->root_item
.drop_level
= 0;
2250 btrfs_set_root_refs(&dest
->root_item
, 0);
2252 if (!xchg(&dest
->orphan_item_inserted
, 1)) {
2253 ret
= btrfs_insert_orphan_item(trans
,
2254 root
->fs_info
->tree_root
,
2255 dest
->root_key
.objectid
);
2257 btrfs_abort_transaction(trans
, root
, ret
);
2263 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2264 dest
->root_item
.uuid
, BTRFS_UUID_KEY_SUBVOL
,
2265 dest
->root_key
.objectid
);
2266 if (ret
&& ret
!= -ENOENT
) {
2267 btrfs_abort_transaction(trans
, root
, ret
);
2271 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
2272 ret
= btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
2273 dest
->root_item
.received_uuid
,
2274 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
2275 dest
->root_key
.objectid
);
2276 if (ret
&& ret
!= -ENOENT
) {
2277 btrfs_abort_transaction(trans
, root
, ret
);
2284 trans
->block_rsv
= NULL
;
2285 trans
->bytes_reserved
= 0;
2286 ret
= btrfs_end_transaction(trans
, root
);
2289 inode
->i_flags
|= S_DEAD
;
2291 btrfs_subvolume_release_metadata(root
, &block_rsv
, qgroup_reserved
);
2293 up_write(&root
->fs_info
->subvol_sem
);
2295 mutex_unlock(&inode
->i_mutex
);
2297 shrink_dcache_sb(root
->fs_info
->sb
);
2298 btrfs_invalidate_inodes(dest
);
2302 if (dest
->cache_inode
) {
2303 iput(dest
->cache_inode
);
2304 dest
->cache_inode
= NULL
;
2310 mutex_unlock(&dir
->i_mutex
);
2312 mnt_drop_write_file(file
);
2318 static int btrfs_ioctl_defrag(struct file
*file
, void __user
*argp
)
2320 struct inode
*inode
= file_inode(file
);
2321 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2322 struct btrfs_ioctl_defrag_range_args
*range
;
2325 ret
= mnt_want_write_file(file
);
2329 if (btrfs_root_readonly(root
)) {
2334 switch (inode
->i_mode
& S_IFMT
) {
2336 if (!capable(CAP_SYS_ADMIN
)) {
2340 ret
= btrfs_defrag_root(root
);
2343 ret
= btrfs_defrag_root(root
->fs_info
->extent_root
);
2346 if (!(file
->f_mode
& FMODE_WRITE
)) {
2351 range
= kzalloc(sizeof(*range
), GFP_KERNEL
);
2358 if (copy_from_user(range
, argp
,
2364 /* compression requires us to start the IO */
2365 if ((range
->flags
& BTRFS_DEFRAG_RANGE_COMPRESS
)) {
2366 range
->flags
|= BTRFS_DEFRAG_RANGE_START_IO
;
2367 range
->extent_thresh
= (u32
)-1;
2370 /* the rest are all set to zero by kzalloc */
2371 range
->len
= (u64
)-1;
2373 ret
= btrfs_defrag_file(file_inode(file
), file
,
2383 mnt_drop_write_file(file
);
2387 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
2389 struct btrfs_ioctl_vol_args
*vol_args
;
2392 if (!capable(CAP_SYS_ADMIN
))
2395 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2397 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2400 mutex_lock(&root
->fs_info
->volume_mutex
);
2401 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2402 if (IS_ERR(vol_args
)) {
2403 ret
= PTR_ERR(vol_args
);
2407 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2408 ret
= btrfs_init_new_device(root
, vol_args
->name
);
2412 mutex_unlock(&root
->fs_info
->volume_mutex
);
2413 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2417 static long btrfs_ioctl_rm_dev(struct file
*file
, void __user
*arg
)
2419 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
2420 struct btrfs_ioctl_vol_args
*vol_args
;
2423 if (!capable(CAP_SYS_ADMIN
))
2426 ret
= mnt_want_write_file(file
);
2430 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
2431 if (IS_ERR(vol_args
)) {
2432 ret
= PTR_ERR(vol_args
);
2436 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
2438 if (atomic_xchg(&root
->fs_info
->mutually_exclusive_operation_running
,
2440 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
2444 mutex_lock(&root
->fs_info
->volume_mutex
);
2445 ret
= btrfs_rm_device(root
, vol_args
->name
);
2446 mutex_unlock(&root
->fs_info
->volume_mutex
);
2447 atomic_set(&root
->fs_info
->mutually_exclusive_operation_running
, 0);
2451 mnt_drop_write_file(file
);
2455 static long btrfs_ioctl_fs_info(struct btrfs_root
*root
, void __user
*arg
)
2457 struct btrfs_ioctl_fs_info_args
*fi_args
;
2458 struct btrfs_device
*device
;
2459 struct btrfs_device
*next
;
2460 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2463 if (!capable(CAP_SYS_ADMIN
))
2466 fi_args
= kzalloc(sizeof(*fi_args
), GFP_KERNEL
);
2470 mutex_lock(&fs_devices
->device_list_mutex
);
2471 fi_args
->num_devices
= fs_devices
->num_devices
;
2472 memcpy(&fi_args
->fsid
, root
->fs_info
->fsid
, sizeof(fi_args
->fsid
));
2474 list_for_each_entry_safe(device
, next
, &fs_devices
->devices
, dev_list
) {
2475 if (device
->devid
> fi_args
->max_id
)
2476 fi_args
->max_id
= device
->devid
;
2478 mutex_unlock(&fs_devices
->device_list_mutex
);
2480 if (copy_to_user(arg
, fi_args
, sizeof(*fi_args
)))
2487 static long btrfs_ioctl_dev_info(struct btrfs_root
*root
, void __user
*arg
)
2489 struct btrfs_ioctl_dev_info_args
*di_args
;
2490 struct btrfs_device
*dev
;
2491 struct btrfs_fs_devices
*fs_devices
= root
->fs_info
->fs_devices
;
2493 char *s_uuid
= NULL
;
2495 if (!capable(CAP_SYS_ADMIN
))
2498 di_args
= memdup_user(arg
, sizeof(*di_args
));
2499 if (IS_ERR(di_args
))
2500 return PTR_ERR(di_args
);
2502 if (!btrfs_is_empty_uuid(di_args
->uuid
))
2503 s_uuid
= di_args
->uuid
;
2505 mutex_lock(&fs_devices
->device_list_mutex
);
2506 dev
= btrfs_find_device(root
->fs_info
, di_args
->devid
, s_uuid
, NULL
);
2513 di_args
->devid
= dev
->devid
;
2514 di_args
->bytes_used
= dev
->bytes_used
;
2515 di_args
->total_bytes
= dev
->total_bytes
;
2516 memcpy(di_args
->uuid
, dev
->uuid
, sizeof(di_args
->uuid
));
2518 struct rcu_string
*name
;
2521 name
= rcu_dereference(dev
->name
);
2522 strncpy(di_args
->path
, name
->str
, sizeof(di_args
->path
));
2524 di_args
->path
[sizeof(di_args
->path
) - 1] = 0;
2526 di_args
->path
[0] = '\0';
2530 mutex_unlock(&fs_devices
->device_list_mutex
);
2531 if (ret
== 0 && copy_to_user(arg
, di_args
, sizeof(*di_args
)))
2538 static struct page
*extent_same_get_page(struct inode
*inode
, u64 off
)
2542 struct extent_io_tree
*tree
= &BTRFS_I(inode
)->io_tree
;
2544 index
= off
>> PAGE_CACHE_SHIFT
;
2546 page
= grab_cache_page(inode
->i_mapping
, index
);
2550 if (!PageUptodate(page
)) {
2551 if (extent_read_full_page_nolock(tree
, page
, btrfs_get_extent
,
2555 if (!PageUptodate(page
)) {
2557 page_cache_release(page
);
2566 static inline void lock_extent_range(struct inode
*inode
, u64 off
, u64 len
)
2568 /* do any pending delalloc/csum calc on src, one way or
2569 another, and lock file content */
2571 struct btrfs_ordered_extent
*ordered
;
2572 lock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2573 ordered
= btrfs_lookup_first_ordered_extent(inode
,
2576 !test_range_bit(&BTRFS_I(inode
)->io_tree
, off
,
2577 off
+ len
- 1, EXTENT_DELALLOC
, 0, NULL
))
2579 unlock_extent(&BTRFS_I(inode
)->io_tree
, off
, off
+ len
- 1);
2581 btrfs_put_ordered_extent(ordered
);
2582 btrfs_wait_ordered_range(inode
, off
, len
);
2586 static void btrfs_double_unlock(struct inode
*inode1
, u64 loff1
,
2587 struct inode
*inode2
, u64 loff2
, u64 len
)
2589 unlock_extent(&BTRFS_I(inode1
)->io_tree
, loff1
, loff1
+ len
- 1);
2590 unlock_extent(&BTRFS_I(inode2
)->io_tree
, loff2
, loff2
+ len
- 1);
2592 mutex_unlock(&inode1
->i_mutex
);
2593 mutex_unlock(&inode2
->i_mutex
);
2596 static void btrfs_double_lock(struct inode
*inode1
, u64 loff1
,
2597 struct inode
*inode2
, u64 loff2
, u64 len
)
2599 if (inode1
< inode2
) {
2600 swap(inode1
, inode2
);
2604 mutex_lock_nested(&inode1
->i_mutex
, I_MUTEX_PARENT
);
2605 lock_extent_range(inode1
, loff1
, len
);
2606 if (inode1
!= inode2
) {
2607 mutex_lock_nested(&inode2
->i_mutex
, I_MUTEX_CHILD
);
2608 lock_extent_range(inode2
, loff2
, len
);
2612 static int btrfs_cmp_data(struct inode
*src
, u64 loff
, struct inode
*dst
,
2613 u64 dst_loff
, u64 len
)
2616 struct page
*src_page
, *dst_page
;
2617 unsigned int cmp_len
= PAGE_CACHE_SIZE
;
2618 void *addr
, *dst_addr
;
2621 if (len
< PAGE_CACHE_SIZE
)
2624 src_page
= extent_same_get_page(src
, loff
);
2627 dst_page
= extent_same_get_page(dst
, dst_loff
);
2629 page_cache_release(src_page
);
2632 addr
= kmap_atomic(src_page
);
2633 dst_addr
= kmap_atomic(dst_page
);
2635 flush_dcache_page(src_page
);
2636 flush_dcache_page(dst_page
);
2638 if (memcmp(addr
, dst_addr
, cmp_len
))
2639 ret
= BTRFS_SAME_DATA_DIFFERS
;
2641 kunmap_atomic(addr
);
2642 kunmap_atomic(dst_addr
);
2643 page_cache_release(src_page
);
2644 page_cache_release(dst_page
);
2650 dst_loff
+= cmp_len
;
2657 static int extent_same_check_offsets(struct inode
*inode
, u64 off
, u64 len
)
2659 u64 bs
= BTRFS_I(inode
)->root
->fs_info
->sb
->s_blocksize
;
2661 if (off
+ len
> inode
->i_size
|| off
+ len
< off
)
2663 /* Check that we are block aligned - btrfs_clone() requires this */
2664 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
))
2670 static int btrfs_extent_same(struct inode
*src
, u64 loff
, u64 len
,
2671 struct inode
*dst
, u64 dst_loff
)
2676 * btrfs_clone() can't handle extents in the same file
2677 * yet. Once that works, we can drop this check and replace it
2678 * with a check for the same inode, but overlapping extents.
2683 btrfs_double_lock(src
, loff
, dst
, dst_loff
, len
);
2685 ret
= extent_same_check_offsets(src
, loff
, len
);
2689 ret
= extent_same_check_offsets(dst
, dst_loff
, len
);
2693 /* don't make the dst file partly checksummed */
2694 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
2695 (BTRFS_I(dst
)->flags
& BTRFS_INODE_NODATASUM
)) {
2700 ret
= btrfs_cmp_data(src
, loff
, dst
, dst_loff
, len
);
2702 ret
= btrfs_clone(src
, dst
, loff
, len
, len
, dst_loff
);
2705 btrfs_double_unlock(src
, loff
, dst
, dst_loff
, len
);
2710 #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2712 static long btrfs_ioctl_file_extent_same(struct file
*file
,
2715 struct btrfs_ioctl_same_args tmp
;
2716 struct btrfs_ioctl_same_args
*same
;
2717 struct btrfs_ioctl_same_extent_info
*info
;
2718 struct inode
*src
= file
->f_dentry
->d_inode
;
2719 struct file
*dst_file
= NULL
;
2726 u64 bs
= BTRFS_I(src
)->root
->fs_info
->sb
->s_blocksize
;
2727 bool is_admin
= capable(CAP_SYS_ADMIN
);
2729 if (!(file
->f_mode
& FMODE_READ
))
2732 ret
= mnt_want_write_file(file
);
2736 if (copy_from_user(&tmp
,
2737 (struct btrfs_ioctl_same_args __user
*)argp
,
2743 size
= sizeof(tmp
) +
2744 tmp
.dest_count
* sizeof(struct btrfs_ioctl_same_extent_info
);
2746 same
= memdup_user((struct btrfs_ioctl_same_args __user
*)argp
, size
);
2749 ret
= PTR_ERR(same
);
2753 off
= same
->logical_offset
;
2757 * Limit the total length we will dedupe for each operation.
2758 * This is intended to bound the total time spent in this
2759 * ioctl to something sane.
2761 if (len
> BTRFS_MAX_DEDUPE_LEN
)
2762 len
= BTRFS_MAX_DEDUPE_LEN
;
2764 if (WARN_ON_ONCE(bs
< PAGE_CACHE_SIZE
)) {
2766 * Btrfs does not support blocksize < page_size. As a
2767 * result, btrfs_cmp_data() won't correctly handle
2768 * this situation without an update.
2775 if (S_ISDIR(src
->i_mode
))
2779 if (!S_ISREG(src
->i_mode
))
2782 /* pre-format output fields to sane values */
2783 for (i
= 0; i
< same
->dest_count
; i
++) {
2784 same
->info
[i
].bytes_deduped
= 0ULL;
2785 same
->info
[i
].status
= 0;
2789 for (i
= 0; i
< same
->dest_count
; i
++) {
2790 info
= &same
->info
[i
];
2792 dst_file
= fget(info
->fd
);
2794 info
->status
= -EBADF
;
2798 if (!(is_admin
|| (dst_file
->f_mode
& FMODE_WRITE
))) {
2799 info
->status
= -EINVAL
;
2803 info
->status
= -EXDEV
;
2804 if (file
->f_path
.mnt
!= dst_file
->f_path
.mnt
)
2807 dst
= dst_file
->f_dentry
->d_inode
;
2808 if (src
->i_sb
!= dst
->i_sb
)
2811 if (S_ISDIR(dst
->i_mode
)) {
2812 info
->status
= -EISDIR
;
2816 if (!S_ISREG(dst
->i_mode
)) {
2817 info
->status
= -EACCES
;
2821 info
->status
= btrfs_extent_same(src
, off
, len
, dst
,
2822 info
->logical_offset
);
2823 if (info
->status
== 0)
2824 info
->bytes_deduped
+= len
;
2831 ret
= copy_to_user(argp
, same
, size
);
2836 mnt_drop_write_file(file
);
2841 * btrfs_clone() - clone a range from inode file to another
2843 * @src: Inode to clone from
2844 * @inode: Inode to clone to
2845 * @off: Offset within source to start clone from
2846 * @olen: Original length, passed by user, of range to clone
2847 * @olen_aligned: Block-aligned value of olen, extent_same uses
2848 * identical values here
2849 * @destoff: Offset within @inode to start clone
2851 static int btrfs_clone(struct inode
*src
, struct inode
*inode
,
2852 u64 off
, u64 olen
, u64 olen_aligned
, u64 destoff
)
2854 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2855 struct btrfs_path
*path
= NULL
;
2856 struct extent_buffer
*leaf
;
2857 struct btrfs_trans_handle
*trans
;
2859 struct btrfs_key key
;
2863 u64 len
= olen_aligned
;
2866 buf
= vmalloc(btrfs_level_size(root
, 0));
2870 path
= btrfs_alloc_path();
2878 key
.objectid
= btrfs_ino(src
);
2879 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2884 * note the key will change type as we walk through the
2887 ret
= btrfs_search_slot(NULL
, BTRFS_I(src
)->root
, &key
, path
,
2892 nritems
= btrfs_header_nritems(path
->nodes
[0]);
2893 if (path
->slots
[0] >= nritems
) {
2894 ret
= btrfs_next_leaf(BTRFS_I(src
)->root
, path
);
2899 nritems
= btrfs_header_nritems(path
->nodes
[0]);
2901 leaf
= path
->nodes
[0];
2902 slot
= path
->slots
[0];
2904 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2905 if (btrfs_key_type(&key
) > BTRFS_EXTENT_DATA_KEY
||
2906 key
.objectid
!= btrfs_ino(src
))
2909 if (btrfs_key_type(&key
) == BTRFS_EXTENT_DATA_KEY
) {
2910 struct btrfs_file_extent_item
*extent
;
2913 struct btrfs_key new_key
;
2914 u64 disko
= 0, diskl
= 0;
2915 u64 datao
= 0, datal
= 0;
2919 size
= btrfs_item_size_nr(leaf
, slot
);
2920 read_extent_buffer(leaf
, buf
,
2921 btrfs_item_ptr_offset(leaf
, slot
),
2924 extent
= btrfs_item_ptr(leaf
, slot
,
2925 struct btrfs_file_extent_item
);
2926 comp
= btrfs_file_extent_compression(leaf
, extent
);
2927 type
= btrfs_file_extent_type(leaf
, extent
);
2928 if (type
== BTRFS_FILE_EXTENT_REG
||
2929 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
2930 disko
= btrfs_file_extent_disk_bytenr(leaf
,
2932 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
2934 datao
= btrfs_file_extent_offset(leaf
, extent
);
2935 datal
= btrfs_file_extent_num_bytes(leaf
,
2937 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
2938 /* take upper bound, may be compressed */
2939 datal
= btrfs_file_extent_ram_bytes(leaf
,
2942 btrfs_release_path(path
);
2944 if (key
.offset
+ datal
<= off
||
2945 key
.offset
>= off
+ len
- 1)
2948 memcpy(&new_key
, &key
, sizeof(new_key
));
2949 new_key
.objectid
= btrfs_ino(inode
);
2950 if (off
<= key
.offset
)
2951 new_key
.offset
= key
.offset
+ destoff
- off
;
2953 new_key
.offset
= destoff
;
2956 * 1 - adjusting old extent (we may have to split it)
2957 * 1 - add new extent
2960 trans
= btrfs_start_transaction(root
, 3);
2961 if (IS_ERR(trans
)) {
2962 ret
= PTR_ERR(trans
);
2966 if (type
== BTRFS_FILE_EXTENT_REG
||
2967 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
2969 * a | --- range to clone ---| b
2970 * | ------------- extent ------------- |
2973 /* substract range b */
2974 if (key
.offset
+ datal
> off
+ len
)
2975 datal
= off
+ len
- key
.offset
;
2977 /* substract range a */
2978 if (off
> key
.offset
) {
2979 datao
+= off
- key
.offset
;
2980 datal
-= off
- key
.offset
;
2983 ret
= btrfs_drop_extents(trans
, root
, inode
,
2985 new_key
.offset
+ datal
,
2988 btrfs_abort_transaction(trans
, root
,
2990 btrfs_end_transaction(trans
, root
);
2994 ret
= btrfs_insert_empty_item(trans
, root
, path
,
2997 btrfs_abort_transaction(trans
, root
,
2999 btrfs_end_transaction(trans
, root
);
3003 leaf
= path
->nodes
[0];
3004 slot
= path
->slots
[0];
3005 write_extent_buffer(leaf
, buf
,
3006 btrfs_item_ptr_offset(leaf
, slot
),
3009 extent
= btrfs_item_ptr(leaf
, slot
,
3010 struct btrfs_file_extent_item
);
3012 /* disko == 0 means it's a hole */
3016 btrfs_set_file_extent_offset(leaf
, extent
,
3018 btrfs_set_file_extent_num_bytes(leaf
, extent
,
3021 inode_add_bytes(inode
, datal
);
3022 ret
= btrfs_inc_extent_ref(trans
, root
,
3024 root
->root_key
.objectid
,
3026 new_key
.offset
- datao
,
3029 btrfs_abort_transaction(trans
,
3032 btrfs_end_transaction(trans
,
3038 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
3041 if (off
> key
.offset
) {
3042 skip
= off
- key
.offset
;
3043 new_key
.offset
+= skip
;
3046 if (key
.offset
+ datal
> off
+ len
)
3047 trim
= key
.offset
+ datal
- (off
+ len
);
3049 if (comp
&& (skip
|| trim
)) {
3051 btrfs_end_transaction(trans
, root
);
3054 size
-= skip
+ trim
;
3055 datal
-= skip
+ trim
;
3057 ret
= btrfs_drop_extents(trans
, root
, inode
,
3059 new_key
.offset
+ datal
,
3062 btrfs_abort_transaction(trans
, root
,
3064 btrfs_end_transaction(trans
, root
);
3068 ret
= btrfs_insert_empty_item(trans
, root
, path
,
3071 btrfs_abort_transaction(trans
, root
,
3073 btrfs_end_transaction(trans
, root
);
3079 btrfs_file_extent_calc_inline_size(0);
3080 memmove(buf
+start
, buf
+start
+skip
,
3084 leaf
= path
->nodes
[0];
3085 slot
= path
->slots
[0];
3086 write_extent_buffer(leaf
, buf
,
3087 btrfs_item_ptr_offset(leaf
, slot
),
3089 inode_add_bytes(inode
, datal
);
3092 btrfs_mark_buffer_dirty(leaf
);
3093 btrfs_release_path(path
);
3095 inode_inc_iversion(inode
);
3096 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
3099 * we round up to the block size at eof when
3100 * determining which extents to clone above,
3101 * but shouldn't round up the file size
3103 endoff
= new_key
.offset
+ datal
;
3104 if (endoff
> destoff
+olen
)
3105 endoff
= destoff
+olen
;
3106 if (endoff
> inode
->i_size
)
3107 btrfs_i_size_write(inode
, endoff
);
3109 ret
= btrfs_update_inode(trans
, root
, inode
);
3111 btrfs_abort_transaction(trans
, root
, ret
);
3112 btrfs_end_transaction(trans
, root
);
3115 ret
= btrfs_end_transaction(trans
, root
);
3118 btrfs_release_path(path
);
3124 btrfs_release_path(path
);
3125 btrfs_free_path(path
);
3130 static noinline
long btrfs_ioctl_clone(struct file
*file
, unsigned long srcfd
,
3131 u64 off
, u64 olen
, u64 destoff
)
3133 struct inode
*inode
= file_inode(file
);
3134 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3139 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
3144 * - split compressed inline extents. annoying: we need to
3145 * decompress into destination's address_space (the file offset
3146 * may change, so source mapping won't do), then recompress (or
3147 * otherwise reinsert) a subrange.
3148 * - allow ranges within the same file to be cloned (provided
3149 * they don't overlap)?
3152 /* the destination must be opened for writing */
3153 if (!(file
->f_mode
& FMODE_WRITE
) || (file
->f_flags
& O_APPEND
))
3156 if (btrfs_root_readonly(root
))
3159 ret
= mnt_want_write_file(file
);
3163 src_file
= fdget(srcfd
);
3164 if (!src_file
.file
) {
3166 goto out_drop_write
;
3170 if (src_file
.file
->f_path
.mnt
!= file
->f_path
.mnt
)
3173 src
= file_inode(src_file
.file
);
3179 /* the src must be open for reading */
3180 if (!(src_file
.file
->f_mode
& FMODE_READ
))
3183 /* don't make the dst file partly checksummed */
3184 if ((BTRFS_I(src
)->flags
& BTRFS_INODE_NODATASUM
) !=
3185 (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
))
3189 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
3193 if (src
->i_sb
!= inode
->i_sb
)
3198 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_PARENT
);
3199 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_CHILD
);
3201 mutex_lock_nested(&src
->i_mutex
, I_MUTEX_PARENT
);
3202 mutex_lock_nested(&inode
->i_mutex
, I_MUTEX_CHILD
);
3205 mutex_lock(&src
->i_mutex
);
3208 /* determine range to clone */
3210 if (off
+ len
> src
->i_size
|| off
+ len
< off
)
3213 olen
= len
= src
->i_size
- off
;
3214 /* if we extend to eof, continue to block boundary */
3215 if (off
+ len
== src
->i_size
)
3216 len
= ALIGN(src
->i_size
, bs
) - off
;
3218 /* verify the end result is block aligned */
3219 if (!IS_ALIGNED(off
, bs
) || !IS_ALIGNED(off
+ len
, bs
) ||
3220 !IS_ALIGNED(destoff
, bs
))
3223 /* verify if ranges are overlapped within the same file */
3225 if (destoff
+ len
> off
&& destoff
< off
+ len
)
3229 if (destoff
> inode
->i_size
) {
3230 ret
= btrfs_cont_expand(inode
, inode
->i_size
, destoff
);
3235 /* truncate page cache pages from target inode range */
3236 truncate_inode_pages_range(&inode
->i_data
, destoff
,
3237 PAGE_CACHE_ALIGN(destoff
+ len
) - 1);
3239 lock_extent_range(src
, off
, len
);
3241 ret
= btrfs_clone(src
, inode
, off
, olen
, len
, destoff
);
3243 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+ len
- 1);
3245 mutex_unlock(&src
->i_mutex
);
3247 mutex_unlock(&inode
->i_mutex
);
3251 mnt_drop_write_file(file
);
3255 static long btrfs_ioctl_clone_range(struct file
*file
, void __user
*argp
)
3257 struct btrfs_ioctl_clone_range_args args
;
3259 if (copy_from_user(&args
, argp
, sizeof(args
)))
3261 return btrfs_ioctl_clone(file
, args
.src_fd
, args
.src_offset
,
3262 args
.src_length
, args
.dest_offset
);
3266 * there are many ways the trans_start and trans_end ioctls can lead
3267 * to deadlocks. They should only be used by applications that
3268 * basically own the machine, and have a very in depth understanding
3269 * of all the possible deadlocks and enospc problems.
3271 static long btrfs_ioctl_trans_start(struct file
*file
)
3273 struct inode
*inode
= file_inode(file
);
3274 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3275 struct btrfs_trans_handle
*trans
;
3279 if (!capable(CAP_SYS_ADMIN
))
3283 if (file
->private_data
)
3287 if (btrfs_root_readonly(root
))
3290 ret
= mnt_want_write_file(file
);
3294 atomic_inc(&root
->fs_info
->open_ioctl_trans
);
3297 trans
= btrfs_start_ioctl_transaction(root
);
3301 file
->private_data
= trans
;
3305 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3306 mnt_drop_write_file(file
);
3311 static long btrfs_ioctl_default_subvol(struct file
*file
, void __user
*argp
)
3313 struct inode
*inode
= file_inode(file
);
3314 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3315 struct btrfs_root
*new_root
;
3316 struct btrfs_dir_item
*di
;
3317 struct btrfs_trans_handle
*trans
;
3318 struct btrfs_path
*path
;
3319 struct btrfs_key location
;
3320 struct btrfs_disk_key disk_key
;
3325 if (!capable(CAP_SYS_ADMIN
))
3328 ret
= mnt_want_write_file(file
);
3332 if (copy_from_user(&objectid
, argp
, sizeof(objectid
))) {
3338 objectid
= BTRFS_FS_TREE_OBJECTID
;
3340 location
.objectid
= objectid
;
3341 location
.type
= BTRFS_ROOT_ITEM_KEY
;
3342 location
.offset
= (u64
)-1;
3344 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &location
);
3345 if (IS_ERR(new_root
)) {
3346 ret
= PTR_ERR(new_root
);
3350 path
= btrfs_alloc_path();
3355 path
->leave_spinning
= 1;
3357 trans
= btrfs_start_transaction(root
, 1);
3358 if (IS_ERR(trans
)) {
3359 btrfs_free_path(path
);
3360 ret
= PTR_ERR(trans
);
3364 dir_id
= btrfs_super_root_dir(root
->fs_info
->super_copy
);
3365 di
= btrfs_lookup_dir_item(trans
, root
->fs_info
->tree_root
, path
,
3366 dir_id
, "default", 7, 1);
3367 if (IS_ERR_OR_NULL(di
)) {
3368 btrfs_free_path(path
);
3369 btrfs_end_transaction(trans
, root
);
3370 btrfs_err(new_root
->fs_info
, "Umm, you don't have the default dir"
3371 "item, this isn't going to work");
3376 btrfs_cpu_key_to_disk(&disk_key
, &new_root
->root_key
);
3377 btrfs_set_dir_item_key(path
->nodes
[0], di
, &disk_key
);
3378 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3379 btrfs_free_path(path
);
3381 btrfs_set_fs_incompat(root
->fs_info
, DEFAULT_SUBVOL
);
3382 btrfs_end_transaction(trans
, root
);
3384 mnt_drop_write_file(file
);
3388 void btrfs_get_block_group_info(struct list_head
*groups_list
,
3389 struct btrfs_ioctl_space_info
*space
)
3391 struct btrfs_block_group_cache
*block_group
;
3393 space
->total_bytes
= 0;
3394 space
->used_bytes
= 0;
3396 list_for_each_entry(block_group
, groups_list
, list
) {
3397 space
->flags
= block_group
->flags
;
3398 space
->total_bytes
+= block_group
->key
.offset
;
3399 space
->used_bytes
+=
3400 btrfs_block_group_used(&block_group
->item
);
3404 static long btrfs_ioctl_space_info(struct btrfs_root
*root
, void __user
*arg
)
3406 struct btrfs_ioctl_space_args space_args
;
3407 struct btrfs_ioctl_space_info space
;
3408 struct btrfs_ioctl_space_info
*dest
;
3409 struct btrfs_ioctl_space_info
*dest_orig
;
3410 struct btrfs_ioctl_space_info __user
*user_dest
;
3411 struct btrfs_space_info
*info
;
3412 u64 types
[] = {BTRFS_BLOCK_GROUP_DATA
,
3413 BTRFS_BLOCK_GROUP_SYSTEM
,
3414 BTRFS_BLOCK_GROUP_METADATA
,
3415 BTRFS_BLOCK_GROUP_DATA
| BTRFS_BLOCK_GROUP_METADATA
};
3422 if (copy_from_user(&space_args
,
3423 (struct btrfs_ioctl_space_args __user
*)arg
,
3424 sizeof(space_args
)))
3427 for (i
= 0; i
< num_types
; i
++) {
3428 struct btrfs_space_info
*tmp
;
3432 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3434 if (tmp
->flags
== types
[i
]) {
3444 down_read(&info
->groups_sem
);
3445 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3446 if (!list_empty(&info
->block_groups
[c
]))
3449 up_read(&info
->groups_sem
);
3452 /* space_slots == 0 means they are asking for a count */
3453 if (space_args
.space_slots
== 0) {
3454 space_args
.total_spaces
= slot_count
;
3458 slot_count
= min_t(u64
, space_args
.space_slots
, slot_count
);
3460 alloc_size
= sizeof(*dest
) * slot_count
;
3462 /* we generally have at most 6 or so space infos, one for each raid
3463 * level. So, a whole page should be more than enough for everyone
3465 if (alloc_size
> PAGE_CACHE_SIZE
)
3468 space_args
.total_spaces
= 0;
3469 dest
= kmalloc(alloc_size
, GFP_NOFS
);
3474 /* now we have a buffer to copy into */
3475 for (i
= 0; i
< num_types
; i
++) {
3476 struct btrfs_space_info
*tmp
;
3483 list_for_each_entry_rcu(tmp
, &root
->fs_info
->space_info
,
3485 if (tmp
->flags
== types
[i
]) {
3494 down_read(&info
->groups_sem
);
3495 for (c
= 0; c
< BTRFS_NR_RAID_TYPES
; c
++) {
3496 if (!list_empty(&info
->block_groups
[c
])) {
3497 btrfs_get_block_group_info(
3498 &info
->block_groups
[c
], &space
);
3499 memcpy(dest
, &space
, sizeof(space
));
3501 space_args
.total_spaces
++;
3507 up_read(&info
->groups_sem
);
3510 user_dest
= (struct btrfs_ioctl_space_info __user
*)
3511 (arg
+ sizeof(struct btrfs_ioctl_space_args
));
3513 if (copy_to_user(user_dest
, dest_orig
, alloc_size
))
3518 if (ret
== 0 && copy_to_user(arg
, &space_args
, sizeof(space_args
)))
3524 static long btrfs_ioctl_global_rsv(struct btrfs_root
*root
, void __user
*arg
)
3526 struct btrfs_block_rsv
*block_rsv
= &root
->fs_info
->global_block_rsv
;
3529 spin_lock(&block_rsv
->lock
);
3530 reserved
= block_rsv
->reserved
;
3531 spin_unlock(&block_rsv
->lock
);
3533 if (arg
&& copy_to_user(arg
, &reserved
, sizeof(reserved
)))
3539 * there are many ways the trans_start and trans_end ioctls can lead
3540 * to deadlocks. They should only be used by applications that
3541 * basically own the machine, and have a very in depth understanding
3542 * of all the possible deadlocks and enospc problems.
3544 long btrfs_ioctl_trans_end(struct file
*file
)
3546 struct inode
*inode
= file_inode(file
);
3547 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3548 struct btrfs_trans_handle
*trans
;
3550 trans
= file
->private_data
;
3553 file
->private_data
= NULL
;
3555 btrfs_end_transaction(trans
, root
);
3557 atomic_dec(&root
->fs_info
->open_ioctl_trans
);
3559 mnt_drop_write_file(file
);
3563 static noinline
long btrfs_ioctl_start_sync(struct btrfs_root
*root
,
3566 struct btrfs_trans_handle
*trans
;
3570 trans
= btrfs_attach_transaction_barrier(root
);
3571 if (IS_ERR(trans
)) {
3572 if (PTR_ERR(trans
) != -ENOENT
)
3573 return PTR_ERR(trans
);
3575 /* No running transaction, don't bother */
3576 transid
= root
->fs_info
->last_trans_committed
;
3579 transid
= trans
->transid
;
3580 ret
= btrfs_commit_transaction_async(trans
, root
, 0);
3582 btrfs_end_transaction(trans
, root
);
3587 if (copy_to_user(argp
, &transid
, sizeof(transid
)))
3592 static noinline
long btrfs_ioctl_wait_sync(struct btrfs_root
*root
,
3598 if (copy_from_user(&transid
, argp
, sizeof(transid
)))
3601 transid
= 0; /* current trans */
3603 return btrfs_wait_for_commit(root
, transid
);
3606 static long btrfs_ioctl_scrub(struct file
*file
, void __user
*arg
)
3608 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
3609 struct btrfs_ioctl_scrub_args
*sa
;
3612 if (!capable(CAP_SYS_ADMIN
))
3615 sa
= memdup_user(arg
, sizeof(*sa
));
3619 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
)) {
3620 ret
= mnt_want_write_file(file
);
3625 ret
= btrfs_scrub_dev(root
->fs_info
, sa
->devid
, sa
->start
, sa
->end
,
3626 &sa
->progress
, sa
->flags
& BTRFS_SCRUB_READONLY
,
3629 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3632 if (!(sa
->flags
& BTRFS_SCRUB_READONLY
))
3633 mnt_drop_write_file(file
);
3639 static long btrfs_ioctl_scrub_cancel(struct btrfs_root
*root
, void __user
*arg
)
3641 if (!capable(CAP_SYS_ADMIN
))
3644 return btrfs_scrub_cancel(root
->fs_info
);
3647 static long btrfs_ioctl_scrub_progress(struct btrfs_root
*root
,
3650 struct btrfs_ioctl_scrub_args
*sa
;
3653 if (!capable(CAP_SYS_ADMIN
))
3656 sa
= memdup_user(arg
, sizeof(*sa
));
3660 ret
= btrfs_scrub_progress(root
, sa
->devid
, &sa
->progress
);
3662 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3669 static long btrfs_ioctl_get_dev_stats(struct btrfs_root
*root
,
3672 struct btrfs_ioctl_get_dev_stats
*sa
;
3675 sa
= memdup_user(arg
, sizeof(*sa
));
3679 if ((sa
->flags
& BTRFS_DEV_STATS_RESET
) && !capable(CAP_SYS_ADMIN
)) {
3684 ret
= btrfs_get_dev_stats(root
, sa
);
3686 if (copy_to_user(arg
, sa
, sizeof(*sa
)))
3693 static long btrfs_ioctl_dev_replace(struct btrfs_root
*root
, void __user
*arg
)
3695 struct btrfs_ioctl_dev_replace_args
*p
;
3698 if (!capable(CAP_SYS_ADMIN
))
3701 p
= memdup_user(arg
, sizeof(*p
));
3706 case BTRFS_IOCTL_DEV_REPLACE_CMD_START
:
3707 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
) {
3712 &root
->fs_info
->mutually_exclusive_operation_running
,
3714 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3716 ret
= btrfs_dev_replace_start(root
, p
);
3718 &root
->fs_info
->mutually_exclusive_operation_running
,
3722 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS
:
3723 btrfs_dev_replace_status(root
->fs_info
, p
);
3726 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL
:
3727 ret
= btrfs_dev_replace_cancel(root
->fs_info
, p
);
3734 if (copy_to_user(arg
, p
, sizeof(*p
)))
3741 static long btrfs_ioctl_ino_to_path(struct btrfs_root
*root
, void __user
*arg
)
3747 struct btrfs_ioctl_ino_path_args
*ipa
= NULL
;
3748 struct inode_fs_paths
*ipath
= NULL
;
3749 struct btrfs_path
*path
;
3751 if (!capable(CAP_DAC_READ_SEARCH
))
3754 path
= btrfs_alloc_path();
3760 ipa
= memdup_user(arg
, sizeof(*ipa
));
3767 size
= min_t(u32
, ipa
->size
, 4096);
3768 ipath
= init_ipath(size
, root
, path
);
3769 if (IS_ERR(ipath
)) {
3770 ret
= PTR_ERR(ipath
);
3775 ret
= paths_from_inode(ipa
->inum
, ipath
);
3779 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
) {
3780 rel_ptr
= ipath
->fspath
->val
[i
] -
3781 (u64
)(unsigned long)ipath
->fspath
->val
;
3782 ipath
->fspath
->val
[i
] = rel_ptr
;
3785 ret
= copy_to_user((void *)(unsigned long)ipa
->fspath
,
3786 (void *)(unsigned long)ipath
->fspath
, size
);
3793 btrfs_free_path(path
);
3800 static int build_ino_list(u64 inum
, u64 offset
, u64 root
, void *ctx
)
3802 struct btrfs_data_container
*inodes
= ctx
;
3803 const size_t c
= 3 * sizeof(u64
);
3805 if (inodes
->bytes_left
>= c
) {
3806 inodes
->bytes_left
-= c
;
3807 inodes
->val
[inodes
->elem_cnt
] = inum
;
3808 inodes
->val
[inodes
->elem_cnt
+ 1] = offset
;
3809 inodes
->val
[inodes
->elem_cnt
+ 2] = root
;
3810 inodes
->elem_cnt
+= 3;
3812 inodes
->bytes_missing
+= c
- inodes
->bytes_left
;
3813 inodes
->bytes_left
= 0;
3814 inodes
->elem_missed
+= 3;
3820 static long btrfs_ioctl_logical_to_ino(struct btrfs_root
*root
,
3825 struct btrfs_ioctl_logical_ino_args
*loi
;
3826 struct btrfs_data_container
*inodes
= NULL
;
3827 struct btrfs_path
*path
= NULL
;
3829 if (!capable(CAP_SYS_ADMIN
))
3832 loi
= memdup_user(arg
, sizeof(*loi
));
3839 path
= btrfs_alloc_path();
3845 size
= min_t(u32
, loi
->size
, 64 * 1024);
3846 inodes
= init_data_container(size
);
3847 if (IS_ERR(inodes
)) {
3848 ret
= PTR_ERR(inodes
);
3853 ret
= iterate_inodes_from_logical(loi
->logical
, root
->fs_info
, path
,
3854 build_ino_list
, inodes
);
3860 ret
= copy_to_user((void *)(unsigned long)loi
->inodes
,
3861 (void *)(unsigned long)inodes
, size
);
3866 btrfs_free_path(path
);
3873 void update_ioctl_balance_args(struct btrfs_fs_info
*fs_info
, int lock
,
3874 struct btrfs_ioctl_balance_args
*bargs
)
3876 struct btrfs_balance_control
*bctl
= fs_info
->balance_ctl
;
3878 bargs
->flags
= bctl
->flags
;
3880 if (atomic_read(&fs_info
->balance_running
))
3881 bargs
->state
|= BTRFS_BALANCE_STATE_RUNNING
;
3882 if (atomic_read(&fs_info
->balance_pause_req
))
3883 bargs
->state
|= BTRFS_BALANCE_STATE_PAUSE_REQ
;
3884 if (atomic_read(&fs_info
->balance_cancel_req
))
3885 bargs
->state
|= BTRFS_BALANCE_STATE_CANCEL_REQ
;
3887 memcpy(&bargs
->data
, &bctl
->data
, sizeof(bargs
->data
));
3888 memcpy(&bargs
->meta
, &bctl
->meta
, sizeof(bargs
->meta
));
3889 memcpy(&bargs
->sys
, &bctl
->sys
, sizeof(bargs
->sys
));
3892 spin_lock(&fs_info
->balance_lock
);
3893 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
3894 spin_unlock(&fs_info
->balance_lock
);
3896 memcpy(&bargs
->stat
, &bctl
->stat
, sizeof(bargs
->stat
));
3900 static long btrfs_ioctl_balance(struct file
*file
, void __user
*arg
)
3902 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
3903 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3904 struct btrfs_ioctl_balance_args
*bargs
;
3905 struct btrfs_balance_control
*bctl
;
3906 bool need_unlock
; /* for mut. excl. ops lock */
3909 if (!capable(CAP_SYS_ADMIN
))
3912 ret
= mnt_want_write_file(file
);
3917 if (!atomic_xchg(&fs_info
->mutually_exclusive_operation_running
, 1)) {
3918 mutex_lock(&fs_info
->volume_mutex
);
3919 mutex_lock(&fs_info
->balance_mutex
);
3925 * mut. excl. ops lock is locked. Three possibilites:
3926 * (1) some other op is running
3927 * (2) balance is running
3928 * (3) balance is paused -- special case (think resume)
3930 mutex_lock(&fs_info
->balance_mutex
);
3931 if (fs_info
->balance_ctl
) {
3932 /* this is either (2) or (3) */
3933 if (!atomic_read(&fs_info
->balance_running
)) {
3934 mutex_unlock(&fs_info
->balance_mutex
);
3935 if (!mutex_trylock(&fs_info
->volume_mutex
))
3937 mutex_lock(&fs_info
->balance_mutex
);
3939 if (fs_info
->balance_ctl
&&
3940 !atomic_read(&fs_info
->balance_running
)) {
3942 need_unlock
= false;
3946 mutex_unlock(&fs_info
->balance_mutex
);
3947 mutex_unlock(&fs_info
->volume_mutex
);
3951 mutex_unlock(&fs_info
->balance_mutex
);
3957 mutex_unlock(&fs_info
->balance_mutex
);
3958 ret
= BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS
;
3963 BUG_ON(!atomic_read(&fs_info
->mutually_exclusive_operation_running
));
3966 bargs
= memdup_user(arg
, sizeof(*bargs
));
3967 if (IS_ERR(bargs
)) {
3968 ret
= PTR_ERR(bargs
);
3972 if (bargs
->flags
& BTRFS_BALANCE_RESUME
) {
3973 if (!fs_info
->balance_ctl
) {
3978 bctl
= fs_info
->balance_ctl
;
3979 spin_lock(&fs_info
->balance_lock
);
3980 bctl
->flags
|= BTRFS_BALANCE_RESUME
;
3981 spin_unlock(&fs_info
->balance_lock
);
3989 if (fs_info
->balance_ctl
) {
3994 bctl
= kzalloc(sizeof(*bctl
), GFP_NOFS
);
4000 bctl
->fs_info
= fs_info
;
4002 memcpy(&bctl
->data
, &bargs
->data
, sizeof(bctl
->data
));
4003 memcpy(&bctl
->meta
, &bargs
->meta
, sizeof(bctl
->meta
));
4004 memcpy(&bctl
->sys
, &bargs
->sys
, sizeof(bctl
->sys
));
4006 bctl
->flags
= bargs
->flags
;
4008 /* balance everything - no filters */
4009 bctl
->flags
|= BTRFS_BALANCE_TYPE_MASK
;
4014 * Ownership of bctl and mutually_exclusive_operation_running
4015 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4016 * or, if restriper was paused all the way until unmount, in
4017 * free_fs_info. mutually_exclusive_operation_running is
4018 * cleared in __cancel_balance.
4020 need_unlock
= false;
4022 ret
= btrfs_balance(bctl
, bargs
);
4025 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4032 mutex_unlock(&fs_info
->balance_mutex
);
4033 mutex_unlock(&fs_info
->volume_mutex
);
4035 atomic_set(&fs_info
->mutually_exclusive_operation_running
, 0);
4037 mnt_drop_write_file(file
);
4041 static long btrfs_ioctl_balance_ctl(struct btrfs_root
*root
, int cmd
)
4043 if (!capable(CAP_SYS_ADMIN
))
4047 case BTRFS_BALANCE_CTL_PAUSE
:
4048 return btrfs_pause_balance(root
->fs_info
);
4049 case BTRFS_BALANCE_CTL_CANCEL
:
4050 return btrfs_cancel_balance(root
->fs_info
);
4056 static long btrfs_ioctl_balance_progress(struct btrfs_root
*root
,
4059 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4060 struct btrfs_ioctl_balance_args
*bargs
;
4063 if (!capable(CAP_SYS_ADMIN
))
4066 mutex_lock(&fs_info
->balance_mutex
);
4067 if (!fs_info
->balance_ctl
) {
4072 bargs
= kzalloc(sizeof(*bargs
), GFP_NOFS
);
4078 update_ioctl_balance_args(fs_info
, 1, bargs
);
4080 if (copy_to_user(arg
, bargs
, sizeof(*bargs
)))
4085 mutex_unlock(&fs_info
->balance_mutex
);
4089 static long btrfs_ioctl_quota_ctl(struct file
*file
, void __user
*arg
)
4091 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4092 struct btrfs_ioctl_quota_ctl_args
*sa
;
4093 struct btrfs_trans_handle
*trans
= NULL
;
4097 if (!capable(CAP_SYS_ADMIN
))
4100 ret
= mnt_want_write_file(file
);
4104 sa
= memdup_user(arg
, sizeof(*sa
));
4110 down_write(&root
->fs_info
->subvol_sem
);
4111 trans
= btrfs_start_transaction(root
->fs_info
->tree_root
, 2);
4112 if (IS_ERR(trans
)) {
4113 ret
= PTR_ERR(trans
);
4118 case BTRFS_QUOTA_CTL_ENABLE
:
4119 ret
= btrfs_quota_enable(trans
, root
->fs_info
);
4121 case BTRFS_QUOTA_CTL_DISABLE
:
4122 ret
= btrfs_quota_disable(trans
, root
->fs_info
);
4129 err
= btrfs_commit_transaction(trans
, root
->fs_info
->tree_root
);
4134 up_write(&root
->fs_info
->subvol_sem
);
4136 mnt_drop_write_file(file
);
4140 static long btrfs_ioctl_qgroup_assign(struct file
*file
, void __user
*arg
)
4142 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4143 struct btrfs_ioctl_qgroup_assign_args
*sa
;
4144 struct btrfs_trans_handle
*trans
;
4148 if (!capable(CAP_SYS_ADMIN
))
4151 ret
= mnt_want_write_file(file
);
4155 sa
= memdup_user(arg
, sizeof(*sa
));
4161 trans
= btrfs_join_transaction(root
);
4162 if (IS_ERR(trans
)) {
4163 ret
= PTR_ERR(trans
);
4167 /* FIXME: check if the IDs really exist */
4169 ret
= btrfs_add_qgroup_relation(trans
, root
->fs_info
,
4172 ret
= btrfs_del_qgroup_relation(trans
, root
->fs_info
,
4176 err
= btrfs_end_transaction(trans
, root
);
4183 mnt_drop_write_file(file
);
4187 static long btrfs_ioctl_qgroup_create(struct file
*file
, void __user
*arg
)
4189 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4190 struct btrfs_ioctl_qgroup_create_args
*sa
;
4191 struct btrfs_trans_handle
*trans
;
4195 if (!capable(CAP_SYS_ADMIN
))
4198 ret
= mnt_want_write_file(file
);
4202 sa
= memdup_user(arg
, sizeof(*sa
));
4208 if (!sa
->qgroupid
) {
4213 trans
= btrfs_join_transaction(root
);
4214 if (IS_ERR(trans
)) {
4215 ret
= PTR_ERR(trans
);
4219 /* FIXME: check if the IDs really exist */
4221 ret
= btrfs_create_qgroup(trans
, root
->fs_info
, sa
->qgroupid
,
4224 ret
= btrfs_remove_qgroup(trans
, root
->fs_info
, sa
->qgroupid
);
4227 err
= btrfs_end_transaction(trans
, root
);
4234 mnt_drop_write_file(file
);
4238 static long btrfs_ioctl_qgroup_limit(struct file
*file
, void __user
*arg
)
4240 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4241 struct btrfs_ioctl_qgroup_limit_args
*sa
;
4242 struct btrfs_trans_handle
*trans
;
4247 if (!capable(CAP_SYS_ADMIN
))
4250 ret
= mnt_want_write_file(file
);
4254 sa
= memdup_user(arg
, sizeof(*sa
));
4260 trans
= btrfs_join_transaction(root
);
4261 if (IS_ERR(trans
)) {
4262 ret
= PTR_ERR(trans
);
4266 qgroupid
= sa
->qgroupid
;
4268 /* take the current subvol as qgroup */
4269 qgroupid
= root
->root_key
.objectid
;
4272 /* FIXME: check if the IDs really exist */
4273 ret
= btrfs_limit_qgroup(trans
, root
->fs_info
, qgroupid
, &sa
->lim
);
4275 err
= btrfs_end_transaction(trans
, root
);
4282 mnt_drop_write_file(file
);
4286 static long btrfs_ioctl_quota_rescan(struct file
*file
, void __user
*arg
)
4288 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4289 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4292 if (!capable(CAP_SYS_ADMIN
))
4295 ret
= mnt_want_write_file(file
);
4299 qsa
= memdup_user(arg
, sizeof(*qsa
));
4310 ret
= btrfs_qgroup_rescan(root
->fs_info
);
4315 mnt_drop_write_file(file
);
4319 static long btrfs_ioctl_quota_rescan_status(struct file
*file
, void __user
*arg
)
4321 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4322 struct btrfs_ioctl_quota_rescan_args
*qsa
;
4325 if (!capable(CAP_SYS_ADMIN
))
4328 qsa
= kzalloc(sizeof(*qsa
), GFP_NOFS
);
4332 if (root
->fs_info
->qgroup_flags
& BTRFS_QGROUP_STATUS_FLAG_RESCAN
) {
4334 qsa
->progress
= root
->fs_info
->qgroup_rescan_progress
.objectid
;
4337 if (copy_to_user(arg
, qsa
, sizeof(*qsa
)))
4344 static long btrfs_ioctl_quota_rescan_wait(struct file
*file
, void __user
*arg
)
4346 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4348 if (!capable(CAP_SYS_ADMIN
))
4351 return btrfs_qgroup_wait_for_completion(root
->fs_info
);
4354 static long btrfs_ioctl_set_received_subvol(struct file
*file
,
4357 struct btrfs_ioctl_received_subvol_args
*sa
= NULL
;
4358 struct inode
*inode
= file_inode(file
);
4359 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4360 struct btrfs_root_item
*root_item
= &root
->root_item
;
4361 struct btrfs_trans_handle
*trans
;
4362 struct timespec ct
= CURRENT_TIME
;
4364 int received_uuid_changed
;
4366 ret
= mnt_want_write_file(file
);
4370 down_write(&root
->fs_info
->subvol_sem
);
4372 if (btrfs_ino(inode
) != BTRFS_FIRST_FREE_OBJECTID
) {
4377 if (btrfs_root_readonly(root
)) {
4382 if (!inode_owner_or_capable(inode
)) {
4387 sa
= memdup_user(arg
, sizeof(*sa
));
4396 * 2 - uuid items (received uuid + subvol uuid)
4398 trans
= btrfs_start_transaction(root
, 3);
4399 if (IS_ERR(trans
)) {
4400 ret
= PTR_ERR(trans
);
4405 sa
->rtransid
= trans
->transid
;
4406 sa
->rtime
.sec
= ct
.tv_sec
;
4407 sa
->rtime
.nsec
= ct
.tv_nsec
;
4409 received_uuid_changed
= memcmp(root_item
->received_uuid
, sa
->uuid
,
4411 if (received_uuid_changed
&&
4412 !btrfs_is_empty_uuid(root_item
->received_uuid
))
4413 btrfs_uuid_tree_rem(trans
, root
->fs_info
->uuid_root
,
4414 root_item
->received_uuid
,
4415 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4416 root
->root_key
.objectid
);
4417 memcpy(root_item
->received_uuid
, sa
->uuid
, BTRFS_UUID_SIZE
);
4418 btrfs_set_root_stransid(root_item
, sa
->stransid
);
4419 btrfs_set_root_rtransid(root_item
, sa
->rtransid
);
4420 btrfs_set_stack_timespec_sec(&root_item
->stime
, sa
->stime
.sec
);
4421 btrfs_set_stack_timespec_nsec(&root_item
->stime
, sa
->stime
.nsec
);
4422 btrfs_set_stack_timespec_sec(&root_item
->rtime
, sa
->rtime
.sec
);
4423 btrfs_set_stack_timespec_nsec(&root_item
->rtime
, sa
->rtime
.nsec
);
4425 ret
= btrfs_update_root(trans
, root
->fs_info
->tree_root
,
4426 &root
->root_key
, &root
->root_item
);
4428 btrfs_end_transaction(trans
, root
);
4431 if (received_uuid_changed
&& !btrfs_is_empty_uuid(sa
->uuid
)) {
4432 ret
= btrfs_uuid_tree_add(trans
, root
->fs_info
->uuid_root
,
4434 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4435 root
->root_key
.objectid
);
4436 if (ret
< 0 && ret
!= -EEXIST
) {
4437 btrfs_abort_transaction(trans
, root
, ret
);
4441 ret
= btrfs_commit_transaction(trans
, root
);
4443 btrfs_abort_transaction(trans
, root
, ret
);
4447 ret
= copy_to_user(arg
, sa
, sizeof(*sa
));
4453 up_write(&root
->fs_info
->subvol_sem
);
4454 mnt_drop_write_file(file
);
4458 static int btrfs_ioctl_get_fslabel(struct file
*file
, void __user
*arg
)
4460 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4463 char label
[BTRFS_LABEL_SIZE
];
4465 spin_lock(&root
->fs_info
->super_lock
);
4466 memcpy(label
, root
->fs_info
->super_copy
->label
, BTRFS_LABEL_SIZE
);
4467 spin_unlock(&root
->fs_info
->super_lock
);
4469 len
= strnlen(label
, BTRFS_LABEL_SIZE
);
4471 if (len
== BTRFS_LABEL_SIZE
) {
4472 btrfs_warn(root
->fs_info
,
4473 "label is too long, return the first %zu bytes", --len
);
4476 ret
= copy_to_user(arg
, label
, len
);
4478 return ret
? -EFAULT
: 0;
4481 static int btrfs_ioctl_set_fslabel(struct file
*file
, void __user
*arg
)
4483 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4484 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
4485 struct btrfs_trans_handle
*trans
;
4486 char label
[BTRFS_LABEL_SIZE
];
4489 if (!capable(CAP_SYS_ADMIN
))
4492 if (copy_from_user(label
, arg
, sizeof(label
)))
4495 if (strnlen(label
, BTRFS_LABEL_SIZE
) == BTRFS_LABEL_SIZE
) {
4496 btrfs_err(root
->fs_info
, "unable to set label with more than %d bytes",
4497 BTRFS_LABEL_SIZE
- 1);
4501 ret
= mnt_want_write_file(file
);
4505 trans
= btrfs_start_transaction(root
, 0);
4506 if (IS_ERR(trans
)) {
4507 ret
= PTR_ERR(trans
);
4511 spin_lock(&root
->fs_info
->super_lock
);
4512 strcpy(super_block
->label
, label
);
4513 spin_unlock(&root
->fs_info
->super_lock
);
4514 ret
= btrfs_end_transaction(trans
, root
);
4517 mnt_drop_write_file(file
);
4521 #define INIT_FEATURE_FLAGS(suffix) \
4522 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4523 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4524 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4526 static int btrfs_ioctl_get_supported_features(struct file
*file
,
4529 static struct btrfs_ioctl_feature_flags features
[3] = {
4530 INIT_FEATURE_FLAGS(SUPP
),
4531 INIT_FEATURE_FLAGS(SAFE_SET
),
4532 INIT_FEATURE_FLAGS(SAFE_CLEAR
)
4535 if (copy_to_user(arg
, &features
, sizeof(features
)))
4541 static int btrfs_ioctl_get_features(struct file
*file
, void __user
*arg
)
4543 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4544 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
4545 struct btrfs_ioctl_feature_flags features
;
4547 features
.compat_flags
= btrfs_super_compat_flags(super_block
);
4548 features
.compat_ro_flags
= btrfs_super_compat_ro_flags(super_block
);
4549 features
.incompat_flags
= btrfs_super_incompat_flags(super_block
);
4551 if (copy_to_user(arg
, &features
, sizeof(features
)))
4557 static int check_feature_bits(struct btrfs_root
*root
,
4558 enum btrfs_feature_set set
,
4559 u64 change_mask
, u64 flags
, u64 supported_flags
,
4560 u64 safe_set
, u64 safe_clear
)
4562 const char *type
= btrfs_feature_set_names
[set
];
4564 u64 disallowed
, unsupported
;
4565 u64 set_mask
= flags
& change_mask
;
4566 u64 clear_mask
= ~flags
& change_mask
;
4568 unsupported
= set_mask
& ~supported_flags
;
4570 names
= btrfs_printable_features(set
, unsupported
);
4572 btrfs_warn(root
->fs_info
,
4573 "this kernel does not support the %s feature bit%s",
4574 names
, strchr(names
, ',') ? "s" : "");
4577 btrfs_warn(root
->fs_info
,
4578 "this kernel does not support %s bits 0x%llx",
4583 disallowed
= set_mask
& ~safe_set
;
4585 names
= btrfs_printable_features(set
, disallowed
);
4587 btrfs_warn(root
->fs_info
,
4588 "can't set the %s feature bit%s while mounted",
4589 names
, strchr(names
, ',') ? "s" : "");
4592 btrfs_warn(root
->fs_info
,
4593 "can't set %s bits 0x%llx while mounted",
4598 disallowed
= clear_mask
& ~safe_clear
;
4600 names
= btrfs_printable_features(set
, disallowed
);
4602 btrfs_warn(root
->fs_info
,
4603 "can't clear the %s feature bit%s while mounted",
4604 names
, strchr(names
, ',') ? "s" : "");
4607 btrfs_warn(root
->fs_info
,
4608 "can't clear %s bits 0x%llx while mounted",
4616 #define check_feature(root, change_mask, flags, mask_base) \
4617 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
4618 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4619 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4620 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4622 static int btrfs_ioctl_set_features(struct file
*file
, void __user
*arg
)
4624 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4625 struct btrfs_super_block
*super_block
= root
->fs_info
->super_copy
;
4626 struct btrfs_ioctl_feature_flags flags
[2];
4627 struct btrfs_trans_handle
*trans
;
4631 if (!capable(CAP_SYS_ADMIN
))
4634 if (copy_from_user(flags
, arg
, sizeof(flags
)))
4638 if (!flags
[0].compat_flags
&& !flags
[0].compat_ro_flags
&&
4639 !flags
[0].incompat_flags
)
4642 ret
= check_feature(root
, flags
[0].compat_flags
,
4643 flags
[1].compat_flags
, COMPAT
);
4647 ret
= check_feature(root
, flags
[0].compat_ro_flags
,
4648 flags
[1].compat_ro_flags
, COMPAT_RO
);
4652 ret
= check_feature(root
, flags
[0].incompat_flags
,
4653 flags
[1].incompat_flags
, INCOMPAT
);
4657 trans
= btrfs_start_transaction(root
, 1);
4659 return PTR_ERR(trans
);
4661 spin_lock(&root
->fs_info
->super_lock
);
4662 newflags
= btrfs_super_compat_flags(super_block
);
4663 newflags
|= flags
[0].compat_flags
& flags
[1].compat_flags
;
4664 newflags
&= ~(flags
[0].compat_flags
& ~flags
[1].compat_flags
);
4665 btrfs_set_super_compat_flags(super_block
, newflags
);
4667 newflags
= btrfs_super_compat_ro_flags(super_block
);
4668 newflags
|= flags
[0].compat_ro_flags
& flags
[1].compat_ro_flags
;
4669 newflags
&= ~(flags
[0].compat_ro_flags
& ~flags
[1].compat_ro_flags
);
4670 btrfs_set_super_compat_ro_flags(super_block
, newflags
);
4672 newflags
= btrfs_super_incompat_flags(super_block
);
4673 newflags
|= flags
[0].incompat_flags
& flags
[1].incompat_flags
;
4674 newflags
&= ~(flags
[0].incompat_flags
& ~flags
[1].incompat_flags
);
4675 btrfs_set_super_incompat_flags(super_block
, newflags
);
4676 spin_unlock(&root
->fs_info
->super_lock
);
4678 return btrfs_end_transaction(trans
, root
);
4681 long btrfs_ioctl(struct file
*file
, unsigned int
4682 cmd
, unsigned long arg
)
4684 struct btrfs_root
*root
= BTRFS_I(file_inode(file
))->root
;
4685 void __user
*argp
= (void __user
*)arg
;
4688 case FS_IOC_GETFLAGS
:
4689 return btrfs_ioctl_getflags(file
, argp
);
4690 case FS_IOC_SETFLAGS
:
4691 return btrfs_ioctl_setflags(file
, argp
);
4692 case FS_IOC_GETVERSION
:
4693 return btrfs_ioctl_getversion(file
, argp
);
4695 return btrfs_ioctl_fitrim(file
, argp
);
4696 case BTRFS_IOC_SNAP_CREATE
:
4697 return btrfs_ioctl_snap_create(file
, argp
, 0);
4698 case BTRFS_IOC_SNAP_CREATE_V2
:
4699 return btrfs_ioctl_snap_create_v2(file
, argp
, 0);
4700 case BTRFS_IOC_SUBVOL_CREATE
:
4701 return btrfs_ioctl_snap_create(file
, argp
, 1);
4702 case BTRFS_IOC_SUBVOL_CREATE_V2
:
4703 return btrfs_ioctl_snap_create_v2(file
, argp
, 1);
4704 case BTRFS_IOC_SNAP_DESTROY
:
4705 return btrfs_ioctl_snap_destroy(file
, argp
);
4706 case BTRFS_IOC_SUBVOL_GETFLAGS
:
4707 return btrfs_ioctl_subvol_getflags(file
, argp
);
4708 case BTRFS_IOC_SUBVOL_SETFLAGS
:
4709 return btrfs_ioctl_subvol_setflags(file
, argp
);
4710 case BTRFS_IOC_DEFAULT_SUBVOL
:
4711 return btrfs_ioctl_default_subvol(file
, argp
);
4712 case BTRFS_IOC_DEFRAG
:
4713 return btrfs_ioctl_defrag(file
, NULL
);
4714 case BTRFS_IOC_DEFRAG_RANGE
:
4715 return btrfs_ioctl_defrag(file
, argp
);
4716 case BTRFS_IOC_RESIZE
:
4717 return btrfs_ioctl_resize(file
, argp
);
4718 case BTRFS_IOC_ADD_DEV
:
4719 return btrfs_ioctl_add_dev(root
, argp
);
4720 case BTRFS_IOC_RM_DEV
:
4721 return btrfs_ioctl_rm_dev(file
, argp
);
4722 case BTRFS_IOC_FS_INFO
:
4723 return btrfs_ioctl_fs_info(root
, argp
);
4724 case BTRFS_IOC_DEV_INFO
:
4725 return btrfs_ioctl_dev_info(root
, argp
);
4726 case BTRFS_IOC_BALANCE
:
4727 return btrfs_ioctl_balance(file
, NULL
);
4728 case BTRFS_IOC_CLONE
:
4729 return btrfs_ioctl_clone(file
, arg
, 0, 0, 0);
4730 case BTRFS_IOC_CLONE_RANGE
:
4731 return btrfs_ioctl_clone_range(file
, argp
);
4732 case BTRFS_IOC_TRANS_START
:
4733 return btrfs_ioctl_trans_start(file
);
4734 case BTRFS_IOC_TRANS_END
:
4735 return btrfs_ioctl_trans_end(file
);
4736 case BTRFS_IOC_TREE_SEARCH
:
4737 return btrfs_ioctl_tree_search(file
, argp
);
4738 case BTRFS_IOC_INO_LOOKUP
:
4739 return btrfs_ioctl_ino_lookup(file
, argp
);
4740 case BTRFS_IOC_INO_PATHS
:
4741 return btrfs_ioctl_ino_to_path(root
, argp
);
4742 case BTRFS_IOC_LOGICAL_INO
:
4743 return btrfs_ioctl_logical_to_ino(root
, argp
);
4744 case BTRFS_IOC_SPACE_INFO
:
4745 return btrfs_ioctl_space_info(root
, argp
);
4746 case BTRFS_IOC_GLOBAL_RSV
:
4747 return btrfs_ioctl_global_rsv(root
, argp
);
4748 case BTRFS_IOC_SYNC
: {
4751 ret
= btrfs_start_delalloc_roots(root
->fs_info
, 0);
4754 ret
= btrfs_sync_fs(file
->f_dentry
->d_sb
, 1);
4757 case BTRFS_IOC_START_SYNC
:
4758 return btrfs_ioctl_start_sync(root
, argp
);
4759 case BTRFS_IOC_WAIT_SYNC
:
4760 return btrfs_ioctl_wait_sync(root
, argp
);
4761 case BTRFS_IOC_SCRUB
:
4762 return btrfs_ioctl_scrub(file
, argp
);
4763 case BTRFS_IOC_SCRUB_CANCEL
:
4764 return btrfs_ioctl_scrub_cancel(root
, argp
);
4765 case BTRFS_IOC_SCRUB_PROGRESS
:
4766 return btrfs_ioctl_scrub_progress(root
, argp
);
4767 case BTRFS_IOC_BALANCE_V2
:
4768 return btrfs_ioctl_balance(file
, argp
);
4769 case BTRFS_IOC_BALANCE_CTL
:
4770 return btrfs_ioctl_balance_ctl(root
, arg
);
4771 case BTRFS_IOC_BALANCE_PROGRESS
:
4772 return btrfs_ioctl_balance_progress(root
, argp
);
4773 case BTRFS_IOC_SET_RECEIVED_SUBVOL
:
4774 return btrfs_ioctl_set_received_subvol(file
, argp
);
4775 case BTRFS_IOC_SEND
:
4776 return btrfs_ioctl_send(file
, argp
);
4777 case BTRFS_IOC_GET_DEV_STATS
:
4778 return btrfs_ioctl_get_dev_stats(root
, argp
);
4779 case BTRFS_IOC_QUOTA_CTL
:
4780 return btrfs_ioctl_quota_ctl(file
, argp
);
4781 case BTRFS_IOC_QGROUP_ASSIGN
:
4782 return btrfs_ioctl_qgroup_assign(file
, argp
);
4783 case BTRFS_IOC_QGROUP_CREATE
:
4784 return btrfs_ioctl_qgroup_create(file
, argp
);
4785 case BTRFS_IOC_QGROUP_LIMIT
:
4786 return btrfs_ioctl_qgroup_limit(file
, argp
);
4787 case BTRFS_IOC_QUOTA_RESCAN
:
4788 return btrfs_ioctl_quota_rescan(file
, argp
);
4789 case BTRFS_IOC_QUOTA_RESCAN_STATUS
:
4790 return btrfs_ioctl_quota_rescan_status(file
, argp
);
4791 case BTRFS_IOC_QUOTA_RESCAN_WAIT
:
4792 return btrfs_ioctl_quota_rescan_wait(file
, argp
);
4793 case BTRFS_IOC_DEV_REPLACE
:
4794 return btrfs_ioctl_dev_replace(root
, argp
);
4795 case BTRFS_IOC_GET_FSLABEL
:
4796 return btrfs_ioctl_get_fslabel(file
, argp
);
4797 case BTRFS_IOC_SET_FSLABEL
:
4798 return btrfs_ioctl_set_fslabel(file
, argp
);
4799 case BTRFS_IOC_FILE_EXTENT_SAME
:
4800 return btrfs_ioctl_file_extent_same(file
, argp
);
4801 case BTRFS_IOC_GET_SUPPORTED_FEATURES
:
4802 return btrfs_ioctl_get_supported_features(file
, argp
);
4803 case BTRFS_IOC_GET_FEATURES
:
4804 return btrfs_ioctl_get_features(file
, argp
);
4805 case BTRFS_IOC_SET_FEATURES
:
4806 return btrfs_ioctl_set_features(file
, argp
);