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"
65 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
66 * structures are incorrect, as the timespec structure from userspace
67 * is 4 bytes too small. We define these alternatives here to teach
68 * the kernel about the 32-bit struct packing.
70 struct btrfs_ioctl_timespec_32 {
73 } __attribute__ ((__packed__));
75 struct btrfs_ioctl_received_subvol_args_32 {
76 char uuid[BTRFS_UUID_SIZE]; /* in */
77 __u64 stransid; /* in */
78 __u64 rtransid; /* out */
79 struct btrfs_ioctl_timespec_32 stime; /* in */
80 struct btrfs_ioctl_timespec_32 rtime; /* out */
82 __u64 reserved[16]; /* in */
83 } __attribute__ ((__packed__));
85 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
86 struct btrfs_ioctl_received_subvol_args_32)
90 static int btrfs_clone(struct inode *src, struct inode *inode,
91 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
94 /* Mask out flags that are inappropriate for the given type of inode. */
95 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
99 else if (S_ISREG(mode))
100 return flags & ~FS_DIRSYNC_FL;
102 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
106 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
108 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
110 unsigned int iflags = 0;
112 if (flags & BTRFS_INODE_SYNC)
113 iflags |= FS_SYNC_FL;
114 if (flags & BTRFS_INODE_IMMUTABLE)
115 iflags |= FS_IMMUTABLE_FL;
116 if (flags & BTRFS_INODE_APPEND)
117 iflags |= FS_APPEND_FL;
118 if (flags & BTRFS_INODE_NODUMP)
119 iflags |= FS_NODUMP_FL;
120 if (flags & BTRFS_INODE_NOATIME)
121 iflags |= FS_NOATIME_FL;
122 if (flags & BTRFS_INODE_DIRSYNC)
123 iflags |= FS_DIRSYNC_FL;
124 if (flags & BTRFS_INODE_NODATACOW)
125 iflags |= FS_NOCOW_FL;
127 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
128 iflags |= FS_COMPR_FL;
129 else if (flags & BTRFS_INODE_NOCOMPRESS)
130 iflags |= FS_NOCOMP_FL;
136 * Update inode->i_flags based on the btrfs internal flags.
138 void btrfs_update_iflags(struct inode *inode)
140 struct btrfs_inode *ip = BTRFS_I(inode);
141 unsigned int new_fl = 0;
143 if (ip->flags & BTRFS_INODE_SYNC)
145 if (ip->flags & BTRFS_INODE_IMMUTABLE)
146 new_fl |= S_IMMUTABLE;
147 if (ip->flags & BTRFS_INODE_APPEND)
149 if (ip->flags & BTRFS_INODE_NOATIME)
151 if (ip->flags & BTRFS_INODE_DIRSYNC)
154 set_mask_bits(&inode->i_flags,
155 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
160 * Inherit flags from the parent inode.
162 * Currently only the compression flags and the cow flags are inherited.
164 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
171 flags = BTRFS_I(dir)->flags;
173 if (flags & BTRFS_INODE_NOCOMPRESS) {
174 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
175 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
176 } else if (flags & BTRFS_INODE_COMPRESS) {
177 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
178 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
181 if (flags & BTRFS_INODE_NODATACOW) {
182 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
183 if (S_ISREG(inode->i_mode))
184 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
187 btrfs_update_iflags(inode);
190 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
192 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
193 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
195 if (copy_to_user(arg, &flags, sizeof(flags)))
200 static int check_flags(unsigned int flags)
202 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
203 FS_NOATIME_FL | FS_NODUMP_FL | \
204 FS_SYNC_FL | FS_DIRSYNC_FL | \
205 FS_NOCOMP_FL | FS_COMPR_FL |
209 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
215 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
217 struct inode *inode = file_inode(file);
218 struct btrfs_inode *ip = BTRFS_I(inode);
219 struct btrfs_root *root = ip->root;
220 struct btrfs_trans_handle *trans;
221 unsigned int flags, oldflags;
224 unsigned int i_oldflags;
227 if (!inode_owner_or_capable(inode))
230 if (btrfs_root_readonly(root))
233 if (copy_from_user(&flags, arg, sizeof(flags)))
236 ret = check_flags(flags);
240 ret = mnt_want_write_file(file);
246 ip_oldflags = ip->flags;
247 i_oldflags = inode->i_flags;
248 mode = inode->i_mode;
250 flags = btrfs_mask_flags(inode->i_mode, flags);
251 oldflags = btrfs_flags_to_ioctl(ip->flags);
252 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
253 if (!capable(CAP_LINUX_IMMUTABLE)) {
259 if (flags & FS_SYNC_FL)
260 ip->flags |= BTRFS_INODE_SYNC;
262 ip->flags &= ~BTRFS_INODE_SYNC;
263 if (flags & FS_IMMUTABLE_FL)
264 ip->flags |= BTRFS_INODE_IMMUTABLE;
266 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
267 if (flags & FS_APPEND_FL)
268 ip->flags |= BTRFS_INODE_APPEND;
270 ip->flags &= ~BTRFS_INODE_APPEND;
271 if (flags & FS_NODUMP_FL)
272 ip->flags |= BTRFS_INODE_NODUMP;
274 ip->flags &= ~BTRFS_INODE_NODUMP;
275 if (flags & FS_NOATIME_FL)
276 ip->flags |= BTRFS_INODE_NOATIME;
278 ip->flags &= ~BTRFS_INODE_NOATIME;
279 if (flags & FS_DIRSYNC_FL)
280 ip->flags |= BTRFS_INODE_DIRSYNC;
282 ip->flags &= ~BTRFS_INODE_DIRSYNC;
283 if (flags & FS_NOCOW_FL) {
286 * It's safe to turn csums off here, no extents exist.
287 * Otherwise we want the flag to reflect the real COW
288 * status of the file and will not set it.
290 if (inode->i_size == 0)
291 ip->flags |= BTRFS_INODE_NODATACOW
292 | BTRFS_INODE_NODATASUM;
294 ip->flags |= BTRFS_INODE_NODATACOW;
298 * Revert back under same assuptions as above
301 if (inode->i_size == 0)
302 ip->flags &= ~(BTRFS_INODE_NODATACOW
303 | BTRFS_INODE_NODATASUM);
305 ip->flags &= ~BTRFS_INODE_NODATACOW;
310 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
311 * flag may be changed automatically if compression code won't make
314 if (flags & FS_NOCOMP_FL) {
315 ip->flags &= ~BTRFS_INODE_COMPRESS;
316 ip->flags |= BTRFS_INODE_NOCOMPRESS;
318 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
319 if (ret && ret != -ENODATA)
321 } else if (flags & FS_COMPR_FL) {
324 ip->flags |= BTRFS_INODE_COMPRESS;
325 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
327 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
331 ret = btrfs_set_prop(inode, "btrfs.compression",
332 comp, strlen(comp), 0);
337 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
338 if (ret && ret != -ENODATA)
340 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
343 trans = btrfs_start_transaction(root, 1);
345 ret = PTR_ERR(trans);
349 btrfs_update_iflags(inode);
350 inode_inc_iversion(inode);
351 inode->i_ctime = current_fs_time(inode->i_sb);
352 ret = btrfs_update_inode(trans, root, inode);
354 btrfs_end_transaction(trans, root);
357 ip->flags = ip_oldflags;
358 inode->i_flags = i_oldflags;
363 mnt_drop_write_file(file);
367 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
369 struct inode *inode = file_inode(file);
371 return put_user(inode->i_generation, arg);
374 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
376 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
377 struct btrfs_device *device;
378 struct request_queue *q;
379 struct fstrim_range range;
380 u64 minlen = ULLONG_MAX;
382 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
385 if (!capable(CAP_SYS_ADMIN))
389 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
393 q = bdev_get_queue(device->bdev);
394 if (blk_queue_discard(q)) {
396 minlen = min((u64)q->limits.discard_granularity,
404 if (copy_from_user(&range, arg, sizeof(range)))
406 if (range.start > total_bytes ||
407 range.len < fs_info->sb->s_blocksize)
410 range.len = min(range.len, total_bytes - range.start);
411 range.minlen = max(range.minlen, minlen);
412 ret = btrfs_trim_fs(fs_info->tree_root, &range);
416 if (copy_to_user(arg, &range, sizeof(range)))
422 int btrfs_is_empty_uuid(u8 *uuid)
426 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
433 static noinline int create_subvol(struct inode *dir,
434 struct dentry *dentry,
435 char *name, int namelen,
437 struct btrfs_qgroup_inherit *inherit)
439 struct btrfs_trans_handle *trans;
440 struct btrfs_key key;
441 struct btrfs_root_item root_item;
442 struct btrfs_inode_item *inode_item;
443 struct extent_buffer *leaf;
444 struct btrfs_root *root = BTRFS_I(dir)->root;
445 struct btrfs_root *new_root;
446 struct btrfs_block_rsv block_rsv;
447 struct timespec cur_time = current_fs_time(dir->i_sb);
452 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
457 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
462 * Don't create subvolume whose level is not zero. Or qgroup will be
463 * screwed up since it assume subvolme qgroup's level to be 0.
465 if (btrfs_qgroup_level(objectid))
468 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
470 * The same as the snapshot creation, please see the comment
471 * of create_snapshot().
473 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
474 8, &qgroup_reserved, false);
478 trans = btrfs_start_transaction(root, 0);
480 ret = PTR_ERR(trans);
481 btrfs_subvolume_release_metadata(root, &block_rsv,
485 trans->block_rsv = &block_rsv;
486 trans->bytes_reserved = block_rsv.size;
488 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
492 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
498 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
499 btrfs_set_header_bytenr(leaf, leaf->start);
500 btrfs_set_header_generation(leaf, trans->transid);
501 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
502 btrfs_set_header_owner(leaf, objectid);
504 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
506 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
507 btrfs_header_chunk_tree_uuid(leaf),
509 btrfs_mark_buffer_dirty(leaf);
511 memset(&root_item, 0, sizeof(root_item));
513 inode_item = &root_item.inode;
514 btrfs_set_stack_inode_generation(inode_item, 1);
515 btrfs_set_stack_inode_size(inode_item, 3);
516 btrfs_set_stack_inode_nlink(inode_item, 1);
517 btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
518 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
520 btrfs_set_root_flags(&root_item, 0);
521 btrfs_set_root_limit(&root_item, 0);
522 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
524 btrfs_set_root_bytenr(&root_item, leaf->start);
525 btrfs_set_root_generation(&root_item, trans->transid);
526 btrfs_set_root_level(&root_item, 0);
527 btrfs_set_root_refs(&root_item, 1);
528 btrfs_set_root_used(&root_item, leaf->len);
529 btrfs_set_root_last_snapshot(&root_item, 0);
531 btrfs_set_root_generation_v2(&root_item,
532 btrfs_root_generation(&root_item));
533 uuid_le_gen(&new_uuid);
534 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
535 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
536 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
537 root_item.ctime = root_item.otime;
538 btrfs_set_root_ctransid(&root_item, trans->transid);
539 btrfs_set_root_otransid(&root_item, trans->transid);
541 btrfs_tree_unlock(leaf);
542 free_extent_buffer(leaf);
545 btrfs_set_root_dirid(&root_item, new_dirid);
547 key.objectid = objectid;
549 key.type = BTRFS_ROOT_ITEM_KEY;
550 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
555 key.offset = (u64)-1;
556 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
557 if (IS_ERR(new_root)) {
558 ret = PTR_ERR(new_root);
559 btrfs_abort_transaction(trans, root, ret);
563 btrfs_record_root_in_trans(trans, new_root);
565 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
567 /* We potentially lose an unused inode item here */
568 btrfs_abort_transaction(trans, root, ret);
572 mutex_lock(&new_root->objectid_mutex);
573 new_root->highest_objectid = new_dirid;
574 mutex_unlock(&new_root->objectid_mutex);
577 * insert the directory item
579 ret = btrfs_set_inode_index(dir, &index);
581 btrfs_abort_transaction(trans, root, ret);
585 ret = btrfs_insert_dir_item(trans, root,
586 name, namelen, dir, &key,
587 BTRFS_FT_DIR, index);
589 btrfs_abort_transaction(trans, root, ret);
593 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
594 ret = btrfs_update_inode(trans, root, dir);
597 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
598 objectid, root->root_key.objectid,
599 btrfs_ino(dir), index, name, namelen);
602 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
603 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
606 btrfs_abort_transaction(trans, root, ret);
609 trans->block_rsv = NULL;
610 trans->bytes_reserved = 0;
611 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
614 *async_transid = trans->transid;
615 err = btrfs_commit_transaction_async(trans, root, 1);
617 err = btrfs_commit_transaction(trans, root);
619 err = btrfs_commit_transaction(trans, root);
625 inode = btrfs_lookup_dentry(dir, dentry);
627 return PTR_ERR(inode);
628 d_instantiate(dentry, inode);
633 static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root)
639 prepare_to_wait(&root->subv_writers->wait, &wait,
640 TASK_UNINTERRUPTIBLE);
642 writers = percpu_counter_sum(&root->subv_writers->counter);
646 finish_wait(&root->subv_writers->wait, &wait);
650 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
651 struct dentry *dentry, char *name, int namelen,
652 u64 *async_transid, bool readonly,
653 struct btrfs_qgroup_inherit *inherit)
656 struct btrfs_pending_snapshot *pending_snapshot;
657 struct btrfs_trans_handle *trans;
660 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
663 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
664 if (!pending_snapshot)
667 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
669 pending_snapshot->path = btrfs_alloc_path();
670 if (!pending_snapshot->root_item || !pending_snapshot->path) {
675 atomic_inc(&root->will_be_snapshoted);
676 smp_mb__after_atomic();
677 btrfs_wait_for_no_snapshoting_writes(root);
679 ret = btrfs_start_delalloc_inodes(root, 0);
683 btrfs_wait_ordered_extents(root, -1);
685 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
686 BTRFS_BLOCK_RSV_TEMP);
688 * 1 - parent dir inode
691 * 2 - root ref/backref
692 * 1 - root of snapshot
695 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
696 &pending_snapshot->block_rsv, 8,
697 &pending_snapshot->qgroup_reserved,
702 pending_snapshot->dentry = dentry;
703 pending_snapshot->root = root;
704 pending_snapshot->readonly = readonly;
705 pending_snapshot->dir = dir;
706 pending_snapshot->inherit = inherit;
708 trans = btrfs_start_transaction(root, 0);
710 ret = PTR_ERR(trans);
714 spin_lock(&root->fs_info->trans_lock);
715 list_add(&pending_snapshot->list,
716 &trans->transaction->pending_snapshots);
717 spin_unlock(&root->fs_info->trans_lock);
719 *async_transid = trans->transid;
720 ret = btrfs_commit_transaction_async(trans,
721 root->fs_info->extent_root, 1);
723 ret = btrfs_commit_transaction(trans, root);
725 ret = btrfs_commit_transaction(trans,
726 root->fs_info->extent_root);
731 ret = pending_snapshot->error;
735 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
739 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
741 ret = PTR_ERR(inode);
745 d_instantiate(dentry, inode);
748 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
749 &pending_snapshot->block_rsv,
750 pending_snapshot->qgroup_reserved);
752 if (atomic_dec_and_test(&root->will_be_snapshoted))
753 wake_up_atomic_t(&root->will_be_snapshoted);
755 kfree(pending_snapshot->root_item);
756 btrfs_free_path(pending_snapshot->path);
757 kfree(pending_snapshot);
762 /* copy of may_delete in fs/namei.c()
763 * Check whether we can remove a link victim from directory dir, check
764 * whether the type of victim is right.
765 * 1. We can't do it if dir is read-only (done in permission())
766 * 2. We should have write and exec permissions on dir
767 * 3. We can't remove anything from append-only dir
768 * 4. We can't do anything with immutable dir (done in permission())
769 * 5. If the sticky bit on dir is set we should either
770 * a. be owner of dir, or
771 * b. be owner of victim, or
772 * c. have CAP_FOWNER capability
773 * 6. If the victim is append-only or immutable we can't do antyhing with
774 * links pointing to it.
775 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
776 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
777 * 9. We can't remove a root or mountpoint.
778 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
779 * nfs_async_unlink().
782 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
786 if (d_really_is_negative(victim))
789 BUG_ON(d_inode(victim->d_parent) != dir);
790 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
792 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
797 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
798 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
801 if (!d_is_dir(victim))
805 } else if (d_is_dir(victim))
809 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
814 /* copy of may_create in fs/namei.c() */
815 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
817 if (d_really_is_positive(child))
821 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
825 * Create a new subvolume below @parent. This is largely modeled after
826 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
827 * inside this filesystem so it's quite a bit simpler.
829 static noinline int btrfs_mksubvol(struct path *parent,
830 char *name, int namelen,
831 struct btrfs_root *snap_src,
832 u64 *async_transid, bool readonly,
833 struct btrfs_qgroup_inherit *inherit)
835 struct inode *dir = d_inode(parent->dentry);
836 struct dentry *dentry;
839 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
843 dentry = lookup_one_len(name, parent->dentry, namelen);
844 error = PTR_ERR(dentry);
848 error = btrfs_may_create(dir, dentry);
853 * even if this name doesn't exist, we may get hash collisions.
854 * check for them now when we can safely fail
856 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
862 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
864 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
868 error = create_snapshot(snap_src, dir, dentry, name, namelen,
869 async_transid, readonly, inherit);
871 error = create_subvol(dir, dentry, name, namelen,
872 async_transid, inherit);
875 fsnotify_mkdir(dir, dentry);
877 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
886 * When we're defragging a range, we don't want to kick it off again
887 * if it is really just waiting for delalloc to send it down.
888 * If we find a nice big extent or delalloc range for the bytes in the
889 * file you want to defrag, we return 0 to let you know to skip this
892 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
894 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
895 struct extent_map *em = NULL;
896 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
899 read_lock(&em_tree->lock);
900 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
901 read_unlock(&em_tree->lock);
904 end = extent_map_end(em);
906 if (end - offset > thresh)
909 /* if we already have a nice delalloc here, just stop */
911 end = count_range_bits(io_tree, &offset, offset + thresh,
912 thresh, EXTENT_DELALLOC, 1);
919 * helper function to walk through a file and find extents
920 * newer than a specific transid, and smaller than thresh.
922 * This is used by the defragging code to find new and small
925 static int find_new_extents(struct btrfs_root *root,
926 struct inode *inode, u64 newer_than,
927 u64 *off, u32 thresh)
929 struct btrfs_path *path;
930 struct btrfs_key min_key;
931 struct extent_buffer *leaf;
932 struct btrfs_file_extent_item *extent;
935 u64 ino = btrfs_ino(inode);
937 path = btrfs_alloc_path();
941 min_key.objectid = ino;
942 min_key.type = BTRFS_EXTENT_DATA_KEY;
943 min_key.offset = *off;
946 ret = btrfs_search_forward(root, &min_key, path, newer_than);
950 if (min_key.objectid != ino)
952 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
955 leaf = path->nodes[0];
956 extent = btrfs_item_ptr(leaf, path->slots[0],
957 struct btrfs_file_extent_item);
959 type = btrfs_file_extent_type(leaf, extent);
960 if (type == BTRFS_FILE_EXTENT_REG &&
961 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
962 check_defrag_in_cache(inode, min_key.offset, thresh)) {
963 *off = min_key.offset;
964 btrfs_free_path(path);
969 if (path->slots[0] < btrfs_header_nritems(leaf)) {
970 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
974 if (min_key.offset == (u64)-1)
978 btrfs_release_path(path);
981 btrfs_free_path(path);
985 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
987 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
988 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
989 struct extent_map *em;
990 u64 len = PAGE_CACHE_SIZE;
993 * hopefully we have this extent in the tree already, try without
994 * the full extent lock
996 read_lock(&em_tree->lock);
997 em = lookup_extent_mapping(em_tree, start, len);
998 read_unlock(&em_tree->lock);
1001 struct extent_state *cached = NULL;
1002 u64 end = start + len - 1;
1004 /* get the big lock and read metadata off disk */
1005 lock_extent_bits(io_tree, start, end, &cached);
1006 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1007 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
1016 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1018 struct extent_map *next;
1021 /* this is the last extent */
1022 if (em->start + em->len >= i_size_read(inode))
1025 next = defrag_lookup_extent(inode, em->start + em->len);
1026 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1028 else if ((em->block_start + em->block_len == next->block_start) &&
1029 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1032 free_extent_map(next);
1036 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1037 u64 *last_len, u64 *skip, u64 *defrag_end,
1040 struct extent_map *em;
1042 bool next_mergeable = true;
1043 bool prev_mergeable = true;
1046 * make sure that once we start defragging an extent, we keep on
1049 if (start < *defrag_end)
1054 em = defrag_lookup_extent(inode, start);
1058 /* this will cover holes, and inline extents */
1059 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1065 prev_mergeable = false;
1067 next_mergeable = defrag_check_next_extent(inode, em);
1069 * we hit a real extent, if it is big or the next extent is not a
1070 * real extent, don't bother defragging it
1072 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1073 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1077 * last_len ends up being a counter of how many bytes we've defragged.
1078 * every time we choose not to defrag an extent, we reset *last_len
1079 * so that the next tiny extent will force a defrag.
1081 * The end result of this is that tiny extents before a single big
1082 * extent will force at least part of that big extent to be defragged.
1085 *defrag_end = extent_map_end(em);
1088 *skip = extent_map_end(em);
1092 free_extent_map(em);
1097 * it doesn't do much good to defrag one or two pages
1098 * at a time. This pulls in a nice chunk of pages
1099 * to COW and defrag.
1101 * It also makes sure the delalloc code has enough
1102 * dirty data to avoid making new small extents as part
1105 * It's a good idea to start RA on this range
1106 * before calling this.
1108 static int cluster_pages_for_defrag(struct inode *inode,
1109 struct page **pages,
1110 unsigned long start_index,
1111 unsigned long num_pages)
1113 unsigned long file_end;
1114 u64 isize = i_size_read(inode);
1121 struct btrfs_ordered_extent *ordered;
1122 struct extent_state *cached_state = NULL;
1123 struct extent_io_tree *tree;
1124 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1126 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1127 if (!isize || start_index > file_end)
1130 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1132 ret = btrfs_delalloc_reserve_space(inode,
1133 start_index << PAGE_CACHE_SHIFT,
1134 page_cnt << PAGE_CACHE_SHIFT);
1138 tree = &BTRFS_I(inode)->io_tree;
1140 /* step one, lock all the pages */
1141 for (i = 0; i < page_cnt; i++) {
1144 page = find_or_create_page(inode->i_mapping,
1145 start_index + i, mask);
1149 page_start = page_offset(page);
1150 page_end = page_start + PAGE_CACHE_SIZE - 1;
1152 lock_extent_bits(tree, page_start, page_end,
1154 ordered = btrfs_lookup_ordered_extent(inode,
1156 unlock_extent_cached(tree, page_start, page_end,
1157 &cached_state, GFP_NOFS);
1162 btrfs_start_ordered_extent(inode, ordered, 1);
1163 btrfs_put_ordered_extent(ordered);
1166 * we unlocked the page above, so we need check if
1167 * it was released or not.
1169 if (page->mapping != inode->i_mapping) {
1171 page_cache_release(page);
1176 if (!PageUptodate(page)) {
1177 btrfs_readpage(NULL, page);
1179 if (!PageUptodate(page)) {
1181 page_cache_release(page);
1187 if (page->mapping != inode->i_mapping) {
1189 page_cache_release(page);
1199 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1203 * so now we have a nice long stream of locked
1204 * and up to date pages, lets wait on them
1206 for (i = 0; i < i_done; i++)
1207 wait_on_page_writeback(pages[i]);
1209 page_start = page_offset(pages[0]);
1210 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1212 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1213 page_start, page_end - 1, &cached_state);
1214 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1215 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1216 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1217 &cached_state, GFP_NOFS);
1219 if (i_done != page_cnt) {
1220 spin_lock(&BTRFS_I(inode)->lock);
1221 BTRFS_I(inode)->outstanding_extents++;
1222 spin_unlock(&BTRFS_I(inode)->lock);
1223 btrfs_delalloc_release_space(inode,
1224 start_index << PAGE_CACHE_SHIFT,
1225 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1229 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1230 &cached_state, GFP_NOFS);
1232 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1233 page_start, page_end - 1, &cached_state,
1236 for (i = 0; i < i_done; i++) {
1237 clear_page_dirty_for_io(pages[i]);
1238 ClearPageChecked(pages[i]);
1239 set_page_extent_mapped(pages[i]);
1240 set_page_dirty(pages[i]);
1241 unlock_page(pages[i]);
1242 page_cache_release(pages[i]);
1246 for (i = 0; i < i_done; i++) {
1247 unlock_page(pages[i]);
1248 page_cache_release(pages[i]);
1250 btrfs_delalloc_release_space(inode,
1251 start_index << PAGE_CACHE_SHIFT,
1252 page_cnt << PAGE_CACHE_SHIFT);
1257 int btrfs_defrag_file(struct inode *inode, struct file *file,
1258 struct btrfs_ioctl_defrag_range_args *range,
1259 u64 newer_than, unsigned long max_to_defrag)
1261 struct btrfs_root *root = BTRFS_I(inode)->root;
1262 struct file_ra_state *ra = NULL;
1263 unsigned long last_index;
1264 u64 isize = i_size_read(inode);
1268 u64 newer_off = range->start;
1270 unsigned long ra_index = 0;
1272 int defrag_count = 0;
1273 int compress_type = BTRFS_COMPRESS_ZLIB;
1274 u32 extent_thresh = range->extent_thresh;
1275 unsigned long max_cluster = SZ_256K >> PAGE_CACHE_SHIFT;
1276 unsigned long cluster = max_cluster;
1277 u64 new_align = ~((u64)SZ_128K - 1);
1278 struct page **pages = NULL;
1283 if (range->start >= isize)
1286 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1287 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1289 if (range->compress_type)
1290 compress_type = range->compress_type;
1293 if (extent_thresh == 0)
1294 extent_thresh = SZ_256K;
1297 * if we were not given a file, allocate a readahead
1301 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1304 file_ra_state_init(ra, inode->i_mapping);
1309 pages = kmalloc_array(max_cluster, sizeof(struct page *),
1316 /* find the last page to defrag */
1317 if (range->start + range->len > range->start) {
1318 last_index = min_t(u64, isize - 1,
1319 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1321 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1325 ret = find_new_extents(root, inode, newer_than,
1326 &newer_off, SZ_64K);
1328 range->start = newer_off;
1330 * we always align our defrag to help keep
1331 * the extents in the file evenly spaced
1333 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1337 i = range->start >> PAGE_CACHE_SHIFT;
1340 max_to_defrag = last_index - i + 1;
1343 * make writeback starts from i, so the defrag range can be
1344 * written sequentially.
1346 if (i < inode->i_mapping->writeback_index)
1347 inode->i_mapping->writeback_index = i;
1349 while (i <= last_index && defrag_count < max_to_defrag &&
1350 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) {
1352 * make sure we stop running if someone unmounts
1355 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1358 if (btrfs_defrag_cancelled(root->fs_info)) {
1359 btrfs_debug(root->fs_info, "defrag_file cancelled");
1364 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1365 extent_thresh, &last_len, &skip,
1366 &defrag_end, range->flags &
1367 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1370 * the should_defrag function tells us how much to skip
1371 * bump our counter by the suggested amount
1373 next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE);
1374 i = max(i + 1, next);
1379 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1380 PAGE_CACHE_SHIFT) - i;
1381 cluster = min(cluster, max_cluster);
1383 cluster = max_cluster;
1386 if (i + cluster > ra_index) {
1387 ra_index = max(i, ra_index);
1388 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1390 ra_index += cluster;
1394 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1395 BTRFS_I(inode)->force_compress = compress_type;
1396 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1398 inode_unlock(inode);
1402 defrag_count += ret;
1403 balance_dirty_pages_ratelimited(inode->i_mapping);
1404 inode_unlock(inode);
1407 if (newer_off == (u64)-1)
1413 newer_off = max(newer_off + 1,
1414 (u64)i << PAGE_CACHE_SHIFT);
1416 ret = find_new_extents(root, inode, newer_than,
1417 &newer_off, SZ_64K);
1419 range->start = newer_off;
1420 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1427 last_len += ret << PAGE_CACHE_SHIFT;
1435 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1436 filemap_flush(inode->i_mapping);
1437 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1438 &BTRFS_I(inode)->runtime_flags))
1439 filemap_flush(inode->i_mapping);
1442 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1443 /* the filemap_flush will queue IO into the worker threads, but
1444 * we have to make sure the IO is actually started and that
1445 * ordered extents get created before we return
1447 atomic_inc(&root->fs_info->async_submit_draining);
1448 while (atomic_read(&root->fs_info->nr_async_submits) ||
1449 atomic_read(&root->fs_info->async_delalloc_pages)) {
1450 wait_event(root->fs_info->async_submit_wait,
1451 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1452 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1454 atomic_dec(&root->fs_info->async_submit_draining);
1457 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1458 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1464 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1466 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1467 inode_unlock(inode);
1475 static noinline int btrfs_ioctl_resize(struct file *file,
1481 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1482 struct btrfs_ioctl_vol_args *vol_args;
1483 struct btrfs_trans_handle *trans;
1484 struct btrfs_device *device = NULL;
1487 char *devstr = NULL;
1491 if (!capable(CAP_SYS_ADMIN))
1494 ret = mnt_want_write_file(file);
1498 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1500 mnt_drop_write_file(file);
1501 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1504 mutex_lock(&root->fs_info->volume_mutex);
1505 vol_args = memdup_user(arg, sizeof(*vol_args));
1506 if (IS_ERR(vol_args)) {
1507 ret = PTR_ERR(vol_args);
1511 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1513 sizestr = vol_args->name;
1514 devstr = strchr(sizestr, ':');
1516 sizestr = devstr + 1;
1518 devstr = vol_args->name;
1519 ret = kstrtoull(devstr, 10, &devid);
1526 btrfs_info(root->fs_info, "resizing devid %llu", devid);
1529 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1531 btrfs_info(root->fs_info, "resizer unable to find device %llu",
1537 if (!device->writeable) {
1538 btrfs_info(root->fs_info,
1539 "resizer unable to apply on readonly device %llu",
1545 if (!strcmp(sizestr, "max"))
1546 new_size = device->bdev->bd_inode->i_size;
1548 if (sizestr[0] == '-') {
1551 } else if (sizestr[0] == '+') {
1555 new_size = memparse(sizestr, &retptr);
1556 if (*retptr != '\0' || new_size == 0) {
1562 if (device->is_tgtdev_for_dev_replace) {
1567 old_size = btrfs_device_get_total_bytes(device);
1570 if (new_size > old_size) {
1574 new_size = old_size - new_size;
1575 } else if (mod > 0) {
1576 if (new_size > ULLONG_MAX - old_size) {
1580 new_size = old_size + new_size;
1583 if (new_size < SZ_256M) {
1587 if (new_size > device->bdev->bd_inode->i_size) {
1592 new_size = div_u64(new_size, root->sectorsize);
1593 new_size *= root->sectorsize;
1595 btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu",
1596 rcu_str_deref(device->name), new_size);
1598 if (new_size > old_size) {
1599 trans = btrfs_start_transaction(root, 0);
1600 if (IS_ERR(trans)) {
1601 ret = PTR_ERR(trans);
1604 ret = btrfs_grow_device(trans, device, new_size);
1605 btrfs_commit_transaction(trans, root);
1606 } else if (new_size < old_size) {
1607 ret = btrfs_shrink_device(device, new_size);
1608 } /* equal, nothing need to do */
1613 mutex_unlock(&root->fs_info->volume_mutex);
1614 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1615 mnt_drop_write_file(file);
1619 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1620 char *name, unsigned long fd, int subvol,
1621 u64 *transid, bool readonly,
1622 struct btrfs_qgroup_inherit *inherit)
1627 ret = mnt_want_write_file(file);
1631 namelen = strlen(name);
1632 if (strchr(name, '/')) {
1634 goto out_drop_write;
1637 if (name[0] == '.' &&
1638 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1640 goto out_drop_write;
1644 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1645 NULL, transid, readonly, inherit);
1647 struct fd src = fdget(fd);
1648 struct inode *src_inode;
1651 goto out_drop_write;
1654 src_inode = file_inode(src.file);
1655 if (src_inode->i_sb != file_inode(file)->i_sb) {
1656 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1657 "Snapshot src from another FS");
1659 } else if (!inode_owner_or_capable(src_inode)) {
1661 * Subvolume creation is not restricted, but snapshots
1662 * are limited to own subvolumes only
1666 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1667 BTRFS_I(src_inode)->root,
1668 transid, readonly, inherit);
1673 mnt_drop_write_file(file);
1678 static noinline int btrfs_ioctl_snap_create(struct file *file,
1679 void __user *arg, int subvol)
1681 struct btrfs_ioctl_vol_args *vol_args;
1684 vol_args = memdup_user(arg, sizeof(*vol_args));
1685 if (IS_ERR(vol_args))
1686 return PTR_ERR(vol_args);
1687 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1689 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1690 vol_args->fd, subvol,
1697 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1698 void __user *arg, int subvol)
1700 struct btrfs_ioctl_vol_args_v2 *vol_args;
1704 bool readonly = false;
1705 struct btrfs_qgroup_inherit *inherit = NULL;
1707 vol_args = memdup_user(arg, sizeof(*vol_args));
1708 if (IS_ERR(vol_args))
1709 return PTR_ERR(vol_args);
1710 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1712 if (vol_args->flags &
1713 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1714 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1719 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1721 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1723 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1724 if (vol_args->size > PAGE_CACHE_SIZE) {
1728 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1729 if (IS_ERR(inherit)) {
1730 ret = PTR_ERR(inherit);
1735 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1736 vol_args->fd, subvol, ptr,
1741 if (ptr && copy_to_user(arg +
1742 offsetof(struct btrfs_ioctl_vol_args_v2,
1754 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1757 struct inode *inode = file_inode(file);
1758 struct btrfs_root *root = BTRFS_I(inode)->root;
1762 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1765 down_read(&root->fs_info->subvol_sem);
1766 if (btrfs_root_readonly(root))
1767 flags |= BTRFS_SUBVOL_RDONLY;
1768 up_read(&root->fs_info->subvol_sem);
1770 if (copy_to_user(arg, &flags, sizeof(flags)))
1776 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1779 struct inode *inode = file_inode(file);
1780 struct btrfs_root *root = BTRFS_I(inode)->root;
1781 struct btrfs_trans_handle *trans;
1786 if (!inode_owner_or_capable(inode))
1789 ret = mnt_want_write_file(file);
1793 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1795 goto out_drop_write;
1798 if (copy_from_user(&flags, arg, sizeof(flags))) {
1800 goto out_drop_write;
1803 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1805 goto out_drop_write;
1808 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1810 goto out_drop_write;
1813 down_write(&root->fs_info->subvol_sem);
1816 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1819 root_flags = btrfs_root_flags(&root->root_item);
1820 if (flags & BTRFS_SUBVOL_RDONLY) {
1821 btrfs_set_root_flags(&root->root_item,
1822 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1825 * Block RO -> RW transition if this subvolume is involved in
1828 spin_lock(&root->root_item_lock);
1829 if (root->send_in_progress == 0) {
1830 btrfs_set_root_flags(&root->root_item,
1831 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1832 spin_unlock(&root->root_item_lock);
1834 spin_unlock(&root->root_item_lock);
1835 btrfs_warn(root->fs_info,
1836 "Attempt to set subvolume %llu read-write during send",
1837 root->root_key.objectid);
1843 trans = btrfs_start_transaction(root, 1);
1844 if (IS_ERR(trans)) {
1845 ret = PTR_ERR(trans);
1849 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1850 &root->root_key, &root->root_item);
1852 btrfs_commit_transaction(trans, root);
1855 btrfs_set_root_flags(&root->root_item, root_flags);
1857 up_write(&root->fs_info->subvol_sem);
1859 mnt_drop_write_file(file);
1865 * helper to check if the subvolume references other subvolumes
1867 static noinline int may_destroy_subvol(struct btrfs_root *root)
1869 struct btrfs_path *path;
1870 struct btrfs_dir_item *di;
1871 struct btrfs_key key;
1875 path = btrfs_alloc_path();
1879 /* Make sure this root isn't set as the default subvol */
1880 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1881 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1882 dir_id, "default", 7, 0);
1883 if (di && !IS_ERR(di)) {
1884 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1885 if (key.objectid == root->root_key.objectid) {
1887 btrfs_err(root->fs_info, "deleting default subvolume "
1888 "%llu is not allowed", key.objectid);
1891 btrfs_release_path(path);
1894 key.objectid = root->root_key.objectid;
1895 key.type = BTRFS_ROOT_REF_KEY;
1896 key.offset = (u64)-1;
1898 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1905 if (path->slots[0] > 0) {
1907 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1908 if (key.objectid == root->root_key.objectid &&
1909 key.type == BTRFS_ROOT_REF_KEY)
1913 btrfs_free_path(path);
1917 static noinline int key_in_sk(struct btrfs_key *key,
1918 struct btrfs_ioctl_search_key *sk)
1920 struct btrfs_key test;
1923 test.objectid = sk->min_objectid;
1924 test.type = sk->min_type;
1925 test.offset = sk->min_offset;
1927 ret = btrfs_comp_cpu_keys(key, &test);
1931 test.objectid = sk->max_objectid;
1932 test.type = sk->max_type;
1933 test.offset = sk->max_offset;
1935 ret = btrfs_comp_cpu_keys(key, &test);
1941 static noinline int copy_to_sk(struct btrfs_root *root,
1942 struct btrfs_path *path,
1943 struct btrfs_key *key,
1944 struct btrfs_ioctl_search_key *sk,
1947 unsigned long *sk_offset,
1951 struct extent_buffer *leaf;
1952 struct btrfs_ioctl_search_header sh;
1953 struct btrfs_key test;
1954 unsigned long item_off;
1955 unsigned long item_len;
1961 leaf = path->nodes[0];
1962 slot = path->slots[0];
1963 nritems = btrfs_header_nritems(leaf);
1965 if (btrfs_header_generation(leaf) > sk->max_transid) {
1969 found_transid = btrfs_header_generation(leaf);
1971 for (i = slot; i < nritems; i++) {
1972 item_off = btrfs_item_ptr_offset(leaf, i);
1973 item_len = btrfs_item_size_nr(leaf, i);
1975 btrfs_item_key_to_cpu(leaf, key, i);
1976 if (!key_in_sk(key, sk))
1979 if (sizeof(sh) + item_len > *buf_size) {
1986 * return one empty item back for v1, which does not
1990 *buf_size = sizeof(sh) + item_len;
1995 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2000 sh.objectid = key->objectid;
2001 sh.offset = key->offset;
2002 sh.type = key->type;
2004 sh.transid = found_transid;
2006 /* copy search result header */
2007 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2012 *sk_offset += sizeof(sh);
2015 char __user *up = ubuf + *sk_offset;
2017 if (read_extent_buffer_to_user(leaf, up,
2018 item_off, item_len)) {
2023 *sk_offset += item_len;
2027 if (ret) /* -EOVERFLOW from above */
2030 if (*num_found >= sk->nr_items) {
2037 test.objectid = sk->max_objectid;
2038 test.type = sk->max_type;
2039 test.offset = sk->max_offset;
2040 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2042 else if (key->offset < (u64)-1)
2044 else if (key->type < (u8)-1) {
2047 } else if (key->objectid < (u64)-1) {
2055 * 0: all items from this leaf copied, continue with next
2056 * 1: * more items can be copied, but unused buffer is too small
2057 * * all items were found
2058 * Either way, it will stops the loop which iterates to the next
2060 * -EOVERFLOW: item was to large for buffer
2061 * -EFAULT: could not copy extent buffer back to userspace
2066 static noinline int search_ioctl(struct inode *inode,
2067 struct btrfs_ioctl_search_key *sk,
2071 struct btrfs_root *root;
2072 struct btrfs_key key;
2073 struct btrfs_path *path;
2074 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2077 unsigned long sk_offset = 0;
2079 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2080 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2084 path = btrfs_alloc_path();
2088 if (sk->tree_id == 0) {
2089 /* search the root of the inode that was passed */
2090 root = BTRFS_I(inode)->root;
2092 key.objectid = sk->tree_id;
2093 key.type = BTRFS_ROOT_ITEM_KEY;
2094 key.offset = (u64)-1;
2095 root = btrfs_read_fs_root_no_name(info, &key);
2097 btrfs_free_path(path);
2102 key.objectid = sk->min_objectid;
2103 key.type = sk->min_type;
2104 key.offset = sk->min_offset;
2107 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2113 ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
2114 &sk_offset, &num_found);
2115 btrfs_release_path(path);
2123 sk->nr_items = num_found;
2124 btrfs_free_path(path);
2128 static noinline int btrfs_ioctl_tree_search(struct file *file,
2131 struct btrfs_ioctl_search_args __user *uargs;
2132 struct btrfs_ioctl_search_key sk;
2133 struct inode *inode;
2137 if (!capable(CAP_SYS_ADMIN))
2140 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2142 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2145 buf_size = sizeof(uargs->buf);
2147 inode = file_inode(file);
2148 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2151 * In the origin implementation an overflow is handled by returning a
2152 * search header with a len of zero, so reset ret.
2154 if (ret == -EOVERFLOW)
2157 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2162 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2165 struct btrfs_ioctl_search_args_v2 __user *uarg;
2166 struct btrfs_ioctl_search_args_v2 args;
2167 struct inode *inode;
2170 const size_t buf_limit = SZ_16M;
2172 if (!capable(CAP_SYS_ADMIN))
2175 /* copy search header and buffer size */
2176 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2177 if (copy_from_user(&args, uarg, sizeof(args)))
2180 buf_size = args.buf_size;
2182 if (buf_size < sizeof(struct btrfs_ioctl_search_header))
2185 /* limit result size to 16MB */
2186 if (buf_size > buf_limit)
2187 buf_size = buf_limit;
2189 inode = file_inode(file);
2190 ret = search_ioctl(inode, &args.key, &buf_size,
2191 (char *)(&uarg->buf[0]));
2192 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2194 else if (ret == -EOVERFLOW &&
2195 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2202 * Search INODE_REFs to identify path name of 'dirid' directory
2203 * in a 'tree_id' tree. and sets path name to 'name'.
2205 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2206 u64 tree_id, u64 dirid, char *name)
2208 struct btrfs_root *root;
2209 struct btrfs_key key;
2215 struct btrfs_inode_ref *iref;
2216 struct extent_buffer *l;
2217 struct btrfs_path *path;
2219 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2224 path = btrfs_alloc_path();
2228 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2230 key.objectid = tree_id;
2231 key.type = BTRFS_ROOT_ITEM_KEY;
2232 key.offset = (u64)-1;
2233 root = btrfs_read_fs_root_no_name(info, &key);
2235 btrfs_err(info, "could not find root %llu", tree_id);
2240 key.objectid = dirid;
2241 key.type = BTRFS_INODE_REF_KEY;
2242 key.offset = (u64)-1;
2245 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2249 ret = btrfs_previous_item(root, path, dirid,
2250 BTRFS_INODE_REF_KEY);
2260 slot = path->slots[0];
2261 btrfs_item_key_to_cpu(l, &key, slot);
2263 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2264 len = btrfs_inode_ref_name_len(l, iref);
2266 total_len += len + 1;
2268 ret = -ENAMETOOLONG;
2273 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2275 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2278 btrfs_release_path(path);
2279 key.objectid = key.offset;
2280 key.offset = (u64)-1;
2281 dirid = key.objectid;
2283 memmove(name, ptr, total_len);
2284 name[total_len] = '\0';
2287 btrfs_free_path(path);
2291 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2294 struct btrfs_ioctl_ino_lookup_args *args;
2295 struct inode *inode;
2298 args = memdup_user(argp, sizeof(*args));
2300 return PTR_ERR(args);
2302 inode = file_inode(file);
2305 * Unprivileged query to obtain the containing subvolume root id. The
2306 * path is reset so it's consistent with btrfs_search_path_in_tree.
2308 if (args->treeid == 0)
2309 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2311 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2316 if (!capable(CAP_SYS_ADMIN)) {
2321 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2322 args->treeid, args->objectid,
2326 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2333 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2336 struct dentry *parent = file->f_path.dentry;
2337 struct dentry *dentry;
2338 struct inode *dir = d_inode(parent);
2339 struct inode *inode;
2340 struct btrfs_root *root = BTRFS_I(dir)->root;
2341 struct btrfs_root *dest = NULL;
2342 struct btrfs_ioctl_vol_args *vol_args;
2343 struct btrfs_trans_handle *trans;
2344 struct btrfs_block_rsv block_rsv;
2346 u64 qgroup_reserved;
2351 vol_args = memdup_user(arg, sizeof(*vol_args));
2352 if (IS_ERR(vol_args))
2353 return PTR_ERR(vol_args);
2355 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2356 namelen = strlen(vol_args->name);
2357 if (strchr(vol_args->name, '/') ||
2358 strncmp(vol_args->name, "..", namelen) == 0) {
2363 err = mnt_want_write_file(file);
2368 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2370 goto out_drop_write;
2371 dentry = lookup_one_len(vol_args->name, parent, namelen);
2372 if (IS_ERR(dentry)) {
2373 err = PTR_ERR(dentry);
2374 goto out_unlock_dir;
2377 if (d_really_is_negative(dentry)) {
2382 inode = d_inode(dentry);
2383 dest = BTRFS_I(inode)->root;
2384 if (!capable(CAP_SYS_ADMIN)) {
2386 * Regular user. Only allow this with a special mount
2387 * option, when the user has write+exec access to the
2388 * subvol root, and when rmdir(2) would have been
2391 * Note that this is _not_ check that the subvol is
2392 * empty or doesn't contain data that we wouldn't
2393 * otherwise be able to delete.
2395 * Users who want to delete empty subvols should try
2399 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2403 * Do not allow deletion if the parent dir is the same
2404 * as the dir to be deleted. That means the ioctl
2405 * must be called on the dentry referencing the root
2406 * of the subvol, not a random directory contained
2413 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2418 /* check if subvolume may be deleted by a user */
2419 err = btrfs_may_delete(dir, dentry, 1);
2423 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2431 * Don't allow to delete a subvolume with send in progress. This is
2432 * inside the i_mutex so the error handling that has to drop the bit
2433 * again is not run concurrently.
2435 spin_lock(&dest->root_item_lock);
2436 root_flags = btrfs_root_flags(&dest->root_item);
2437 if (dest->send_in_progress == 0) {
2438 btrfs_set_root_flags(&dest->root_item,
2439 root_flags | BTRFS_ROOT_SUBVOL_DEAD);
2440 spin_unlock(&dest->root_item_lock);
2442 spin_unlock(&dest->root_item_lock);
2443 btrfs_warn(root->fs_info,
2444 "Attempt to delete subvolume %llu during send",
2445 dest->root_key.objectid);
2447 goto out_unlock_inode;
2450 down_write(&root->fs_info->subvol_sem);
2452 err = may_destroy_subvol(dest);
2456 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2458 * One for dir inode, two for dir entries, two for root
2461 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2462 5, &qgroup_reserved, true);
2466 trans = btrfs_start_transaction(root, 0);
2467 if (IS_ERR(trans)) {
2468 err = PTR_ERR(trans);
2471 trans->block_rsv = &block_rsv;
2472 trans->bytes_reserved = block_rsv.size;
2474 ret = btrfs_unlink_subvol(trans, root, dir,
2475 dest->root_key.objectid,
2476 dentry->d_name.name,
2477 dentry->d_name.len);
2480 btrfs_abort_transaction(trans, root, ret);
2484 btrfs_record_root_in_trans(trans, dest);
2486 memset(&dest->root_item.drop_progress, 0,
2487 sizeof(dest->root_item.drop_progress));
2488 dest->root_item.drop_level = 0;
2489 btrfs_set_root_refs(&dest->root_item, 0);
2491 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
2492 ret = btrfs_insert_orphan_item(trans,
2493 root->fs_info->tree_root,
2494 dest->root_key.objectid);
2496 btrfs_abort_transaction(trans, root, ret);
2502 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2503 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2504 dest->root_key.objectid);
2505 if (ret && ret != -ENOENT) {
2506 btrfs_abort_transaction(trans, root, ret);
2510 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2511 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2512 dest->root_item.received_uuid,
2513 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2514 dest->root_key.objectid);
2515 if (ret && ret != -ENOENT) {
2516 btrfs_abort_transaction(trans, root, ret);
2523 trans->block_rsv = NULL;
2524 trans->bytes_reserved = 0;
2526 btrfs_record_snapshot_destroy(trans, dir);
2527 ret = btrfs_end_transaction(trans, root);
2530 inode->i_flags |= S_DEAD;
2532 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2534 up_write(&root->fs_info->subvol_sem);
2536 spin_lock(&dest->root_item_lock);
2537 root_flags = btrfs_root_flags(&dest->root_item);
2538 btrfs_set_root_flags(&dest->root_item,
2539 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
2540 spin_unlock(&dest->root_item_lock);
2543 inode_unlock(inode);
2545 d_invalidate(dentry);
2546 btrfs_invalidate_inodes(dest);
2548 ASSERT(dest->send_in_progress == 0);
2551 if (dest->ino_cache_inode) {
2552 iput(dest->ino_cache_inode);
2553 dest->ino_cache_inode = NULL;
2561 mnt_drop_write_file(file);
2567 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2569 struct inode *inode = file_inode(file);
2570 struct btrfs_root *root = BTRFS_I(inode)->root;
2571 struct btrfs_ioctl_defrag_range_args *range;
2574 ret = mnt_want_write_file(file);
2578 if (btrfs_root_readonly(root)) {
2583 switch (inode->i_mode & S_IFMT) {
2585 if (!capable(CAP_SYS_ADMIN)) {
2589 ret = btrfs_defrag_root(root);
2592 ret = btrfs_defrag_root(root->fs_info->extent_root);
2595 if (!(file->f_mode & FMODE_WRITE)) {
2600 range = kzalloc(sizeof(*range), GFP_KERNEL);
2607 if (copy_from_user(range, argp,
2613 /* compression requires us to start the IO */
2614 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2615 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2616 range->extent_thresh = (u32)-1;
2619 /* the rest are all set to zero by kzalloc */
2620 range->len = (u64)-1;
2622 ret = btrfs_defrag_file(file_inode(file), file,
2632 mnt_drop_write_file(file);
2636 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2638 struct btrfs_ioctl_vol_args *vol_args;
2641 if (!capable(CAP_SYS_ADMIN))
2644 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2646 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2649 mutex_lock(&root->fs_info->volume_mutex);
2650 vol_args = memdup_user(arg, sizeof(*vol_args));
2651 if (IS_ERR(vol_args)) {
2652 ret = PTR_ERR(vol_args);
2656 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2657 ret = btrfs_init_new_device(root, vol_args->name);
2660 btrfs_info(root->fs_info, "disk added %s",vol_args->name);
2664 mutex_unlock(&root->fs_info->volume_mutex);
2665 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2669 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2671 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2672 struct btrfs_ioctl_vol_args *vol_args;
2675 if (!capable(CAP_SYS_ADMIN))
2678 ret = mnt_want_write_file(file);
2682 vol_args = memdup_user(arg, sizeof(*vol_args));
2683 if (IS_ERR(vol_args)) {
2684 ret = PTR_ERR(vol_args);
2688 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2690 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2692 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2696 mutex_lock(&root->fs_info->volume_mutex);
2697 ret = btrfs_rm_device(root, vol_args->name);
2698 mutex_unlock(&root->fs_info->volume_mutex);
2699 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2702 btrfs_info(root->fs_info, "disk deleted %s",vol_args->name);
2707 mnt_drop_write_file(file);
2711 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2713 struct btrfs_ioctl_fs_info_args *fi_args;
2714 struct btrfs_device *device;
2715 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2718 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2722 mutex_lock(&fs_devices->device_list_mutex);
2723 fi_args->num_devices = fs_devices->num_devices;
2724 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2726 list_for_each_entry(device, &fs_devices->devices, dev_list) {
2727 if (device->devid > fi_args->max_id)
2728 fi_args->max_id = device->devid;
2730 mutex_unlock(&fs_devices->device_list_mutex);
2732 fi_args->nodesize = root->fs_info->super_copy->nodesize;
2733 fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
2734 fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;
2736 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2743 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2745 struct btrfs_ioctl_dev_info_args *di_args;
2746 struct btrfs_device *dev;
2747 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2749 char *s_uuid = NULL;
2751 di_args = memdup_user(arg, sizeof(*di_args));
2752 if (IS_ERR(di_args))
2753 return PTR_ERR(di_args);
2755 if (!btrfs_is_empty_uuid(di_args->uuid))
2756 s_uuid = di_args->uuid;
2758 mutex_lock(&fs_devices->device_list_mutex);
2759 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2766 di_args->devid = dev->devid;
2767 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2768 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2769 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2771 struct rcu_string *name;
2774 name = rcu_dereference(dev->name);
2775 strncpy(di_args->path, name->str, sizeof(di_args->path));
2777 di_args->path[sizeof(di_args->path) - 1] = 0;
2779 di_args->path[0] = '\0';
2783 mutex_unlock(&fs_devices->device_list_mutex);
2784 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2791 static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
2795 page = grab_cache_page(inode->i_mapping, index);
2797 return ERR_PTR(-ENOMEM);
2799 if (!PageUptodate(page)) {
2802 ret = btrfs_readpage(NULL, page);
2804 return ERR_PTR(ret);
2806 if (!PageUptodate(page)) {
2808 page_cache_release(page);
2809 return ERR_PTR(-EIO);
2811 if (page->mapping != inode->i_mapping) {
2813 page_cache_release(page);
2814 return ERR_PTR(-EAGAIN);
2821 static int gather_extent_pages(struct inode *inode, struct page **pages,
2822 int num_pages, u64 off)
2825 pgoff_t index = off >> PAGE_CACHE_SHIFT;
2827 for (i = 0; i < num_pages; i++) {
2829 pages[i] = extent_same_get_page(inode, index + i);
2830 if (IS_ERR(pages[i])) {
2831 int err = PTR_ERR(pages[i]);
2842 static int lock_extent_range(struct inode *inode, u64 off, u64 len,
2843 bool retry_range_locking)
2846 * Do any pending delalloc/csum calculations on inode, one way or
2847 * another, and lock file content.
2848 * The locking order is:
2851 * 2) range in the inode's io tree
2854 struct btrfs_ordered_extent *ordered;
2855 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2856 ordered = btrfs_lookup_first_ordered_extent(inode,
2859 ordered->file_offset + ordered->len <= off ||
2860 ordered->file_offset >= off + len) &&
2861 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2862 off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
2864 btrfs_put_ordered_extent(ordered);
2867 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2869 btrfs_put_ordered_extent(ordered);
2870 if (!retry_range_locking)
2872 btrfs_wait_ordered_range(inode, off, len);
2877 static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
2879 inode_unlock(inode1);
2880 inode_unlock(inode2);
2883 static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
2885 if (inode1 < inode2)
2886 swap(inode1, inode2);
2888 inode_lock_nested(inode1, I_MUTEX_PARENT);
2889 inode_lock_nested(inode2, I_MUTEX_CHILD);
2892 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
2893 struct inode *inode2, u64 loff2, u64 len)
2895 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2896 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2899 static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
2900 struct inode *inode2, u64 loff2, u64 len,
2901 bool retry_range_locking)
2905 if (inode1 < inode2) {
2906 swap(inode1, inode2);
2909 ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
2912 ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
2914 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
2921 struct page **src_pages;
2922 struct page **dst_pages;
2925 static void btrfs_cmp_data_free(struct cmp_pages *cmp)
2930 for (i = 0; i < cmp->num_pages; i++) {
2931 pg = cmp->src_pages[i];
2934 page_cache_release(pg);
2936 pg = cmp->dst_pages[i];
2939 page_cache_release(pg);
2942 kfree(cmp->src_pages);
2943 kfree(cmp->dst_pages);
2946 static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
2947 struct inode *dst, u64 dst_loff,
2948 u64 len, struct cmp_pages *cmp)
2951 int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT;
2952 struct page **src_pgarr, **dst_pgarr;
2955 * We must gather up all the pages before we initiate our
2956 * extent locking. We use an array for the page pointers. Size
2957 * of the array is bounded by len, which is in turn bounded by
2958 * BTRFS_MAX_DEDUPE_LEN.
2960 src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
2961 dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
2962 if (!src_pgarr || !dst_pgarr) {
2967 cmp->num_pages = num_pages;
2968 cmp->src_pages = src_pgarr;
2969 cmp->dst_pages = dst_pgarr;
2971 ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff);
2975 ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff);
2979 btrfs_cmp_data_free(cmp);
2983 static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2984 u64 dst_loff, u64 len, struct cmp_pages *cmp)
2988 struct page *src_page, *dst_page;
2989 unsigned int cmp_len = PAGE_CACHE_SIZE;
2990 void *addr, *dst_addr;
2994 if (len < PAGE_CACHE_SIZE)
2997 BUG_ON(i >= cmp->num_pages);
2999 src_page = cmp->src_pages[i];
3000 dst_page = cmp->dst_pages[i];
3001 ASSERT(PageLocked(src_page));
3002 ASSERT(PageLocked(dst_page));
3004 addr = kmap_atomic(src_page);
3005 dst_addr = kmap_atomic(dst_page);
3007 flush_dcache_page(src_page);
3008 flush_dcache_page(dst_page);
3010 if (memcmp(addr, dst_addr, cmp_len))
3013 kunmap_atomic(addr);
3014 kunmap_atomic(dst_addr);
3026 static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
3030 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
3032 if (off + olen > inode->i_size || off + olen < off)
3035 /* if we extend to eof, continue to block boundary */
3036 if (off + len == inode->i_size)
3037 *plen = len = ALIGN(inode->i_size, bs) - off;
3039 /* Check that we are block aligned - btrfs_clone() requires this */
3040 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
3046 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3047 struct inode *dst, u64 dst_loff)
3051 struct cmp_pages cmp;
3053 u64 same_lock_start = 0;
3054 u64 same_lock_len = 0;
3065 ret = extent_same_check_offsets(src, loff, &len, olen);
3070 * Single inode case wants the same checks, except we
3071 * don't want our length pushed out past i_size as
3072 * comparing that data range makes no sense.
3074 * extent_same_check_offsets() will do this for an
3075 * unaligned length at i_size, so catch it here and
3076 * reject the request.
3078 * This effectively means we require aligned extents
3079 * for the single-inode case, whereas the other cases
3080 * allow an unaligned length so long as it ends at
3088 /* Check for overlapping ranges */
3089 if (dst_loff + len > loff && dst_loff < loff + len) {
3094 same_lock_start = min_t(u64, loff, dst_loff);
3095 same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
3097 btrfs_double_inode_lock(src, dst);
3099 ret = extent_same_check_offsets(src, loff, &len, olen);
3103 ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
3108 /* don't make the dst file partly checksummed */
3109 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3110 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
3116 ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);
3121 ret = lock_extent_range(src, same_lock_start, same_lock_len,
3124 ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
3127 * If one of the inodes has dirty pages in the respective range or
3128 * ordered extents, we need to flush dellaloc and wait for all ordered
3129 * extents in the range. We must unlock the pages and the ranges in the
3130 * io trees to avoid deadlocks when flushing delalloc (requires locking
3131 * pages) and when waiting for ordered extents to complete (they require
3134 if (ret == -EAGAIN) {
3136 * Ranges in the io trees already unlocked. Now unlock all
3137 * pages before waiting for all IO to complete.
3139 btrfs_cmp_data_free(&cmp);
3141 btrfs_wait_ordered_range(src, same_lock_start,
3144 btrfs_wait_ordered_range(src, loff, len);
3145 btrfs_wait_ordered_range(dst, dst_loff, len);
3151 /* ranges in the io trees already unlocked */
3152 btrfs_cmp_data_free(&cmp);
3156 /* pass original length for comparison so we stay within i_size */
3157 ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
3159 ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
3162 unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start,
3163 same_lock_start + same_lock_len - 1);
3165 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3167 btrfs_cmp_data_free(&cmp);
3172 btrfs_double_inode_unlock(src, dst);
3177 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3179 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3180 struct file *dst_file, u64 dst_loff)
3182 struct inode *src = file_inode(src_file);
3183 struct inode *dst = file_inode(dst_file);
3184 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3187 if (olen > BTRFS_MAX_DEDUPE_LEN)
3188 olen = BTRFS_MAX_DEDUPE_LEN;
3190 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
3192 * Btrfs does not support blocksize < page_size. As a
3193 * result, btrfs_cmp_data() won't correctly handle
3194 * this situation without an update.
3199 res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
3205 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3206 struct inode *inode,
3212 struct btrfs_root *root = BTRFS_I(inode)->root;
3215 inode_inc_iversion(inode);
3216 if (!no_time_update)
3217 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
3219 * We round up to the block size at eof when determining which
3220 * extents to clone above, but shouldn't round up the file size.
3222 if (endoff > destoff + olen)
3223 endoff = destoff + olen;
3224 if (endoff > inode->i_size)
3225 btrfs_i_size_write(inode, endoff);
3227 ret = btrfs_update_inode(trans, root, inode);
3229 btrfs_abort_transaction(trans, root, ret);
3230 btrfs_end_transaction(trans, root);
3233 ret = btrfs_end_transaction(trans, root);
3238 static void clone_update_extent_map(struct inode *inode,
3239 const struct btrfs_trans_handle *trans,
3240 const struct btrfs_path *path,
3241 const u64 hole_offset,
3244 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
3245 struct extent_map *em;
3248 em = alloc_extent_map();
3250 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3251 &BTRFS_I(inode)->runtime_flags);
3256 struct btrfs_file_extent_item *fi;
3258 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3259 struct btrfs_file_extent_item);
3260 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3261 em->generation = -1;
3262 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3263 BTRFS_FILE_EXTENT_INLINE)
3264 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3265 &BTRFS_I(inode)->runtime_flags);
3267 em->start = hole_offset;
3269 em->ram_bytes = em->len;
3270 em->orig_start = hole_offset;
3271 em->block_start = EXTENT_MAP_HOLE;
3273 em->orig_block_len = 0;
3274 em->compress_type = BTRFS_COMPRESS_NONE;
3275 em->generation = trans->transid;
3279 write_lock(&em_tree->lock);
3280 ret = add_extent_mapping(em_tree, em, 1);
3281 write_unlock(&em_tree->lock);
3282 if (ret != -EEXIST) {
3283 free_extent_map(em);
3286 btrfs_drop_extent_cache(inode, em->start,
3287 em->start + em->len - 1, 0);
3291 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3292 &BTRFS_I(inode)->runtime_flags);
3296 * Make sure we do not end up inserting an inline extent into a file that has
3297 * already other (non-inline) extents. If a file has an inline extent it can
3298 * not have any other extents and the (single) inline extent must start at the
3299 * file offset 0. Failing to respect these rules will lead to file corruption,
3300 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3302 * We can have extents that have been already written to disk or we can have
3303 * dirty ranges still in delalloc, in which case the extent maps and items are
3304 * created only when we run delalloc, and the delalloc ranges might fall outside
3305 * the range we are currently locking in the inode's io tree. So we check the
3306 * inode's i_size because of that (i_size updates are done while holding the
3307 * i_mutex, which we are holding here).
3308 * We also check to see if the inode has a size not greater than "datal" but has
3309 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3310 * protected against such concurrent fallocate calls by the i_mutex).
3312 * If the file has no extents but a size greater than datal, do not allow the
3313 * copy because we would need turn the inline extent into a non-inline one (even
3314 * with NO_HOLES enabled). If we find our destination inode only has one inline
3315 * extent, just overwrite it with the source inline extent if its size is less
3316 * than the source extent's size, or we could copy the source inline extent's
3317 * data into the destination inode's inline extent if the later is greater then
3320 static int clone_copy_inline_extent(struct inode *src,
3322 struct btrfs_trans_handle *trans,
3323 struct btrfs_path *path,
3324 struct btrfs_key *new_key,
3325 const u64 drop_start,
3331 struct btrfs_root *root = BTRFS_I(dst)->root;
3332 const u64 aligned_end = ALIGN(new_key->offset + datal,
3335 struct btrfs_key key;
3337 if (new_key->offset > 0)
3340 key.objectid = btrfs_ino(dst);
3341 key.type = BTRFS_EXTENT_DATA_KEY;
3343 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3346 } else if (ret > 0) {
3347 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3348 ret = btrfs_next_leaf(root, path);
3352 goto copy_inline_extent;
3354 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3355 if (key.objectid == btrfs_ino(dst) &&
3356 key.type == BTRFS_EXTENT_DATA_KEY) {
3357 ASSERT(key.offset > 0);
3360 } else if (i_size_read(dst) <= datal) {
3361 struct btrfs_file_extent_item *ei;
3365 * If the file size is <= datal, make sure there are no other
3366 * extents following (can happen do to an fallocate call with
3367 * the flag FALLOC_FL_KEEP_SIZE).
3369 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3370 struct btrfs_file_extent_item);
3372 * If it's an inline extent, it can not have other extents
3375 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3376 BTRFS_FILE_EXTENT_INLINE)
3377 goto copy_inline_extent;
3379 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3380 if (ext_len > aligned_end)
3383 ret = btrfs_next_item(root, path);
3386 } else if (ret == 0) {
3387 btrfs_item_key_to_cpu(path->nodes[0], &key,
3389 if (key.objectid == btrfs_ino(dst) &&
3390 key.type == BTRFS_EXTENT_DATA_KEY)
3397 * We have no extent items, or we have an extent at offset 0 which may
3398 * or may not be inlined. All these cases are dealt the same way.
3400 if (i_size_read(dst) > datal) {
3402 * If the destination inode has an inline extent...
3403 * This would require copying the data from the source inline
3404 * extent into the beginning of the destination's inline extent.
3405 * But this is really complex, both extents can be compressed
3406 * or just one of them, which would require decompressing and
3407 * re-compressing data (which could increase the new compressed
3408 * size, not allowing the compressed data to fit anymore in an
3410 * So just don't support this case for now (it should be rare,
3411 * we are not really saving space when cloning inline extents).
3416 btrfs_release_path(path);
3417 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3420 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3425 const u32 start = btrfs_file_extent_calc_inline_size(0);
3427 memmove(inline_data + start, inline_data + start + skip, datal);
3430 write_extent_buffer(path->nodes[0], inline_data,
3431 btrfs_item_ptr_offset(path->nodes[0],
3434 inode_add_bytes(dst, datal);
3440 * btrfs_clone() - clone a range from inode file to another
3442 * @src: Inode to clone from
3443 * @inode: Inode to clone to
3444 * @off: Offset within source to start clone from
3445 * @olen: Original length, passed by user, of range to clone
3446 * @olen_aligned: Block-aligned value of olen
3447 * @destoff: Offset within @inode to start clone
3448 * @no_time_update: Whether to update mtime/ctime on the target inode
3450 static int btrfs_clone(struct inode *src, struct inode *inode,
3451 const u64 off, const u64 olen, const u64 olen_aligned,
3452 const u64 destoff, int no_time_update)
3454 struct btrfs_root *root = BTRFS_I(inode)->root;
3455 struct btrfs_path *path = NULL;
3456 struct extent_buffer *leaf;
3457 struct btrfs_trans_handle *trans;
3459 struct btrfs_key key;
3463 const u64 len = olen_aligned;
3464 u64 last_dest_end = destoff;
3467 buf = vmalloc(root->nodesize);
3471 path = btrfs_alloc_path();
3477 path->reada = READA_FORWARD;
3479 key.objectid = btrfs_ino(src);
3480 key.type = BTRFS_EXTENT_DATA_KEY;
3484 u64 next_key_min_offset = key.offset + 1;
3487 * note the key will change type as we walk through the
3490 path->leave_spinning = 1;
3491 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3496 * First search, if no extent item that starts at offset off was
3497 * found but the previous item is an extent item, it's possible
3498 * it might overlap our target range, therefore process it.
3500 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3501 btrfs_item_key_to_cpu(path->nodes[0], &key,
3502 path->slots[0] - 1);
3503 if (key.type == BTRFS_EXTENT_DATA_KEY)
3507 nritems = btrfs_header_nritems(path->nodes[0]);
3509 if (path->slots[0] >= nritems) {
3510 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3515 nritems = btrfs_header_nritems(path->nodes[0]);
3517 leaf = path->nodes[0];
3518 slot = path->slots[0];
3520 btrfs_item_key_to_cpu(leaf, &key, slot);
3521 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3522 key.objectid != btrfs_ino(src))
3525 if (key.type == BTRFS_EXTENT_DATA_KEY) {
3526 struct btrfs_file_extent_item *extent;
3529 struct btrfs_key new_key;
3530 u64 disko = 0, diskl = 0;
3531 u64 datao = 0, datal = 0;
3535 extent = btrfs_item_ptr(leaf, slot,
3536 struct btrfs_file_extent_item);
3537 comp = btrfs_file_extent_compression(leaf, extent);
3538 type = btrfs_file_extent_type(leaf, extent);
3539 if (type == BTRFS_FILE_EXTENT_REG ||
3540 type == BTRFS_FILE_EXTENT_PREALLOC) {
3541 disko = btrfs_file_extent_disk_bytenr(leaf,
3543 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3545 datao = btrfs_file_extent_offset(leaf, extent);
3546 datal = btrfs_file_extent_num_bytes(leaf,
3548 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3549 /* take upper bound, may be compressed */
3550 datal = btrfs_file_extent_ram_bytes(leaf,
3555 * The first search might have left us at an extent
3556 * item that ends before our target range's start, can
3557 * happen if we have holes and NO_HOLES feature enabled.
3559 if (key.offset + datal <= off) {
3562 } else if (key.offset >= off + len) {
3565 next_key_min_offset = key.offset + datal;
3566 size = btrfs_item_size_nr(leaf, slot);
3567 read_extent_buffer(leaf, buf,
3568 btrfs_item_ptr_offset(leaf, slot),
3571 btrfs_release_path(path);
3572 path->leave_spinning = 0;
3574 memcpy(&new_key, &key, sizeof(new_key));
3575 new_key.objectid = btrfs_ino(inode);
3576 if (off <= key.offset)
3577 new_key.offset = key.offset + destoff - off;
3579 new_key.offset = destoff;
3582 * Deal with a hole that doesn't have an extent item
3583 * that represents it (NO_HOLES feature enabled).
3584 * This hole is either in the middle of the cloning
3585 * range or at the beginning (fully overlaps it or
3586 * partially overlaps it).
3588 if (new_key.offset != last_dest_end)
3589 drop_start = last_dest_end;
3591 drop_start = new_key.offset;
3594 * 1 - adjusting old extent (we may have to split it)
3595 * 1 - add new extent
3598 trans = btrfs_start_transaction(root, 3);
3599 if (IS_ERR(trans)) {
3600 ret = PTR_ERR(trans);
3604 if (type == BTRFS_FILE_EXTENT_REG ||
3605 type == BTRFS_FILE_EXTENT_PREALLOC) {
3607 * a | --- range to clone ---| b
3608 * | ------------- extent ------------- |
3611 /* subtract range b */
3612 if (key.offset + datal > off + len)
3613 datal = off + len - key.offset;
3615 /* subtract range a */
3616 if (off > key.offset) {
3617 datao += off - key.offset;
3618 datal -= off - key.offset;
3621 ret = btrfs_drop_extents(trans, root, inode,
3623 new_key.offset + datal,
3626 if (ret != -EOPNOTSUPP)
3627 btrfs_abort_transaction(trans,
3629 btrfs_end_transaction(trans, root);
3633 ret = btrfs_insert_empty_item(trans, root, path,
3636 btrfs_abort_transaction(trans, root,
3638 btrfs_end_transaction(trans, root);
3642 leaf = path->nodes[0];
3643 slot = path->slots[0];
3644 write_extent_buffer(leaf, buf,
3645 btrfs_item_ptr_offset(leaf, slot),
3648 extent = btrfs_item_ptr(leaf, slot,
3649 struct btrfs_file_extent_item);
3651 /* disko == 0 means it's a hole */
3655 btrfs_set_file_extent_offset(leaf, extent,
3657 btrfs_set_file_extent_num_bytes(leaf, extent,
3661 inode_add_bytes(inode, datal);
3662 ret = btrfs_inc_extent_ref(trans, root,
3664 root->root_key.objectid,
3666 new_key.offset - datao);
3668 btrfs_abort_transaction(trans,
3671 btrfs_end_transaction(trans,
3677 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3681 if (off > key.offset) {
3682 skip = off - key.offset;
3683 new_key.offset += skip;
3686 if (key.offset + datal > off + len)
3687 trim = key.offset + datal - (off + len);
3689 if (comp && (skip || trim)) {
3691 btrfs_end_transaction(trans, root);
3694 size -= skip + trim;
3695 datal -= skip + trim;
3697 ret = clone_copy_inline_extent(src, inode,
3704 if (ret != -EOPNOTSUPP)
3705 btrfs_abort_transaction(trans,
3708 btrfs_end_transaction(trans, root);
3711 leaf = path->nodes[0];
3712 slot = path->slots[0];
3715 /* If we have an implicit hole (NO_HOLES feature). */
3716 if (drop_start < new_key.offset)
3717 clone_update_extent_map(inode, trans,
3719 new_key.offset - drop_start);
3721 clone_update_extent_map(inode, trans, path, 0, 0);
3723 btrfs_mark_buffer_dirty(leaf);
3724 btrfs_release_path(path);
3726 last_dest_end = ALIGN(new_key.offset + datal,
3728 ret = clone_finish_inode_update(trans, inode,
3734 if (new_key.offset + datal >= destoff + len)
3737 btrfs_release_path(path);
3738 key.offset = next_key_min_offset;
3742 if (last_dest_end < destoff + len) {
3744 * We have an implicit hole (NO_HOLES feature is enabled) that
3745 * fully or partially overlaps our cloning range at its end.
3747 btrfs_release_path(path);
3750 * 1 - remove extent(s)
3753 trans = btrfs_start_transaction(root, 2);
3754 if (IS_ERR(trans)) {
3755 ret = PTR_ERR(trans);
3758 ret = btrfs_drop_extents(trans, root, inode,
3759 last_dest_end, destoff + len, 1);
3761 if (ret != -EOPNOTSUPP)
3762 btrfs_abort_transaction(trans, root, ret);
3763 btrfs_end_transaction(trans, root);
3766 clone_update_extent_map(inode, trans, NULL, last_dest_end,
3767 destoff + len - last_dest_end);
3768 ret = clone_finish_inode_update(trans, inode, destoff + len,
3769 destoff, olen, no_time_update);
3773 btrfs_free_path(path);
3778 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3779 u64 off, u64 olen, u64 destoff)
3781 struct inode *inode = file_inode(file);
3782 struct inode *src = file_inode(file_src);
3783 struct btrfs_root *root = BTRFS_I(inode)->root;
3786 u64 bs = root->fs_info->sb->s_blocksize;
3787 int same_inode = src == inode;
3791 * - split compressed inline extents. annoying: we need to
3792 * decompress into destination's address_space (the file offset
3793 * may change, so source mapping won't do), then recompress (or
3794 * otherwise reinsert) a subrange.
3796 * - split destination inode's inline extents. The inline extents can
3797 * be either compressed or non-compressed.
3800 if (btrfs_root_readonly(root))
3803 if (file_src->f_path.mnt != file->f_path.mnt ||
3804 src->i_sb != inode->i_sb)
3807 /* don't make the dst file partly checksummed */
3808 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3809 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3812 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3816 btrfs_double_inode_lock(src, inode);
3821 /* determine range to clone */
3823 if (off + len > src->i_size || off + len < off)
3826 olen = len = src->i_size - off;
3827 /* if we extend to eof, continue to block boundary */
3828 if (off + len == src->i_size)
3829 len = ALIGN(src->i_size, bs) - off;
3836 /* verify the end result is block aligned */
3837 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3838 !IS_ALIGNED(destoff, bs))
3841 /* verify if ranges are overlapped within the same file */
3843 if (destoff + len > off && destoff < off + len)
3847 if (destoff > inode->i_size) {
3848 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3854 * Lock the target range too. Right after we replace the file extent
3855 * items in the fs tree (which now point to the cloned data), we might
3856 * have a worker replace them with extent items relative to a write
3857 * operation that was issued before this clone operation (i.e. confront
3858 * with inode.c:btrfs_finish_ordered_io).
3861 u64 lock_start = min_t(u64, off, destoff);
3862 u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
3864 ret = lock_extent_range(src, lock_start, lock_len, true);
3866 ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
3871 /* ranges in the io trees already unlocked */
3875 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3878 u64 lock_start = min_t(u64, off, destoff);
3879 u64 lock_end = max_t(u64, off, destoff) + len - 1;
3881 unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
3883 btrfs_double_extent_unlock(src, off, inode, destoff, len);
3886 * Truncate page cache pages so that future reads will see the cloned
3887 * data immediately and not the previous data.
3889 truncate_inode_pages_range(&inode->i_data,
3890 round_down(destoff, PAGE_CACHE_SIZE),
3891 round_up(destoff + len, PAGE_CACHE_SIZE) - 1);
3894 btrfs_double_inode_unlock(src, inode);
3900 ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
3901 struct file *file_out, loff_t pos_out,
3902 size_t len, unsigned int flags)
3906 ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out);
3912 int btrfs_clone_file_range(struct file *src_file, loff_t off,
3913 struct file *dst_file, loff_t destoff, u64 len)
3915 return btrfs_clone_files(dst_file, src_file, off, len, destoff);
3919 * there are many ways the trans_start and trans_end ioctls can lead
3920 * to deadlocks. They should only be used by applications that
3921 * basically own the machine, and have a very in depth understanding
3922 * of all the possible deadlocks and enospc problems.
3924 static long btrfs_ioctl_trans_start(struct file *file)
3926 struct inode *inode = file_inode(file);
3927 struct btrfs_root *root = BTRFS_I(inode)->root;
3928 struct btrfs_trans_handle *trans;
3932 if (!capable(CAP_SYS_ADMIN))
3936 if (file->private_data)
3940 if (btrfs_root_readonly(root))
3943 ret = mnt_want_write_file(file);
3947 atomic_inc(&root->fs_info->open_ioctl_trans);
3950 trans = btrfs_start_ioctl_transaction(root);
3954 file->private_data = trans;
3958 atomic_dec(&root->fs_info->open_ioctl_trans);
3959 mnt_drop_write_file(file);
3964 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3966 struct inode *inode = file_inode(file);
3967 struct btrfs_root *root = BTRFS_I(inode)->root;
3968 struct btrfs_root *new_root;
3969 struct btrfs_dir_item *di;
3970 struct btrfs_trans_handle *trans;
3971 struct btrfs_path *path;
3972 struct btrfs_key location;
3973 struct btrfs_disk_key disk_key;
3978 if (!capable(CAP_SYS_ADMIN))
3981 ret = mnt_want_write_file(file);
3985 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3991 objectid = BTRFS_FS_TREE_OBJECTID;
3993 location.objectid = objectid;
3994 location.type = BTRFS_ROOT_ITEM_KEY;
3995 location.offset = (u64)-1;
3997 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3998 if (IS_ERR(new_root)) {
3999 ret = PTR_ERR(new_root);
4003 path = btrfs_alloc_path();
4008 path->leave_spinning = 1;
4010 trans = btrfs_start_transaction(root, 1);
4011 if (IS_ERR(trans)) {
4012 btrfs_free_path(path);
4013 ret = PTR_ERR(trans);
4017 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
4018 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
4019 dir_id, "default", 7, 1);
4020 if (IS_ERR_OR_NULL(di)) {
4021 btrfs_free_path(path);
4022 btrfs_end_transaction(trans, root);
4023 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
4024 "item, this isn't going to work");
4029 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4030 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4031 btrfs_mark_buffer_dirty(path->nodes[0]);
4032 btrfs_free_path(path);
4034 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
4035 btrfs_end_transaction(trans, root);
4037 mnt_drop_write_file(file);
4041 void btrfs_get_block_group_info(struct list_head *groups_list,
4042 struct btrfs_ioctl_space_info *space)
4044 struct btrfs_block_group_cache *block_group;
4046 space->total_bytes = 0;
4047 space->used_bytes = 0;
4049 list_for_each_entry(block_group, groups_list, list) {
4050 space->flags = block_group->flags;
4051 space->total_bytes += block_group->key.offset;
4052 space->used_bytes +=
4053 btrfs_block_group_used(&block_group->item);
4057 static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
4059 struct btrfs_ioctl_space_args space_args;
4060 struct btrfs_ioctl_space_info space;
4061 struct btrfs_ioctl_space_info *dest;
4062 struct btrfs_ioctl_space_info *dest_orig;
4063 struct btrfs_ioctl_space_info __user *user_dest;
4064 struct btrfs_space_info *info;
4065 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
4066 BTRFS_BLOCK_GROUP_SYSTEM,
4067 BTRFS_BLOCK_GROUP_METADATA,
4068 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
4075 if (copy_from_user(&space_args,
4076 (struct btrfs_ioctl_space_args __user *)arg,
4077 sizeof(space_args)))
4080 for (i = 0; i < num_types; i++) {
4081 struct btrfs_space_info *tmp;
4085 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
4087 if (tmp->flags == types[i]) {
4097 down_read(&info->groups_sem);
4098 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4099 if (!list_empty(&info->block_groups[c]))
4102 up_read(&info->groups_sem);
4106 * Global block reserve, exported as a space_info
4110 /* space_slots == 0 means they are asking for a count */
4111 if (space_args.space_slots == 0) {
4112 space_args.total_spaces = slot_count;
4116 slot_count = min_t(u64, space_args.space_slots, slot_count);
4118 alloc_size = sizeof(*dest) * slot_count;
4120 /* we generally have at most 6 or so space infos, one for each raid
4121 * level. So, a whole page should be more than enough for everyone
4123 if (alloc_size > PAGE_CACHE_SIZE)
4126 space_args.total_spaces = 0;
4127 dest = kmalloc(alloc_size, GFP_KERNEL);
4132 /* now we have a buffer to copy into */
4133 for (i = 0; i < num_types; i++) {
4134 struct btrfs_space_info *tmp;
4141 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
4143 if (tmp->flags == types[i]) {
4152 down_read(&info->groups_sem);
4153 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4154 if (!list_empty(&info->block_groups[c])) {
4155 btrfs_get_block_group_info(
4156 &info->block_groups[c], &space);
4157 memcpy(dest, &space, sizeof(space));
4159 space_args.total_spaces++;
4165 up_read(&info->groups_sem);
4169 * Add global block reserve
4172 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
4174 spin_lock(&block_rsv->lock);
4175 space.total_bytes = block_rsv->size;
4176 space.used_bytes = block_rsv->size - block_rsv->reserved;
4177 spin_unlock(&block_rsv->lock);
4178 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4179 memcpy(dest, &space, sizeof(space));
4180 space_args.total_spaces++;
4183 user_dest = (struct btrfs_ioctl_space_info __user *)
4184 (arg + sizeof(struct btrfs_ioctl_space_args));
4186 if (copy_to_user(user_dest, dest_orig, alloc_size))
4191 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4198 * there are many ways the trans_start and trans_end ioctls can lead
4199 * to deadlocks. They should only be used by applications that
4200 * basically own the machine, and have a very in depth understanding
4201 * of all the possible deadlocks and enospc problems.
4203 long btrfs_ioctl_trans_end(struct file *file)
4205 struct inode *inode = file_inode(file);
4206 struct btrfs_root *root = BTRFS_I(inode)->root;
4207 struct btrfs_trans_handle *trans;
4209 trans = file->private_data;
4212 file->private_data = NULL;
4214 btrfs_end_transaction(trans, root);
4216 atomic_dec(&root->fs_info->open_ioctl_trans);
4218 mnt_drop_write_file(file);
4222 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4225 struct btrfs_trans_handle *trans;
4229 trans = btrfs_attach_transaction_barrier(root);
4230 if (IS_ERR(trans)) {
4231 if (PTR_ERR(trans) != -ENOENT)
4232 return PTR_ERR(trans);
4234 /* No running transaction, don't bother */
4235 transid = root->fs_info->last_trans_committed;
4238 transid = trans->transid;
4239 ret = btrfs_commit_transaction_async(trans, root, 0);
4241 btrfs_end_transaction(trans, root);
4246 if (copy_to_user(argp, &transid, sizeof(transid)))
4251 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
4257 if (copy_from_user(&transid, argp, sizeof(transid)))
4260 transid = 0; /* current trans */
4262 return btrfs_wait_for_commit(root, transid);
4265 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4267 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4268 struct btrfs_ioctl_scrub_args *sa;
4271 if (!capable(CAP_SYS_ADMIN))
4274 sa = memdup_user(arg, sizeof(*sa));
4278 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4279 ret = mnt_want_write_file(file);
4284 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
4285 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4288 if (copy_to_user(arg, sa, sizeof(*sa)))
4291 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4292 mnt_drop_write_file(file);
4298 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
4300 if (!capable(CAP_SYS_ADMIN))
4303 return btrfs_scrub_cancel(root->fs_info);
4306 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
4309 struct btrfs_ioctl_scrub_args *sa;
4312 if (!capable(CAP_SYS_ADMIN))
4315 sa = memdup_user(arg, sizeof(*sa));
4319 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
4321 if (copy_to_user(arg, sa, sizeof(*sa)))
4328 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
4331 struct btrfs_ioctl_get_dev_stats *sa;
4334 sa = memdup_user(arg, sizeof(*sa));
4338 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4343 ret = btrfs_get_dev_stats(root, sa);
4345 if (copy_to_user(arg, sa, sizeof(*sa)))
4352 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
4354 struct btrfs_ioctl_dev_replace_args *p;
4357 if (!capable(CAP_SYS_ADMIN))
4360 p = memdup_user(arg, sizeof(*p));
4365 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4366 if (root->fs_info->sb->s_flags & MS_RDONLY) {
4371 &root->fs_info->mutually_exclusive_operation_running,
4373 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4375 ret = btrfs_dev_replace_start(root, p);
4377 &root->fs_info->mutually_exclusive_operation_running,
4381 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4382 btrfs_dev_replace_status(root->fs_info, p);
4385 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4386 ret = btrfs_dev_replace_cancel(root->fs_info, p);
4393 if (copy_to_user(arg, p, sizeof(*p)))
4400 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4406 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4407 struct inode_fs_paths *ipath = NULL;
4408 struct btrfs_path *path;
4410 if (!capable(CAP_DAC_READ_SEARCH))
4413 path = btrfs_alloc_path();
4419 ipa = memdup_user(arg, sizeof(*ipa));
4426 size = min_t(u32, ipa->size, 4096);
4427 ipath = init_ipath(size, root, path);
4428 if (IS_ERR(ipath)) {
4429 ret = PTR_ERR(ipath);
4434 ret = paths_from_inode(ipa->inum, ipath);
4438 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4439 rel_ptr = ipath->fspath->val[i] -
4440 (u64)(unsigned long)ipath->fspath->val;
4441 ipath->fspath->val[i] = rel_ptr;
4444 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
4445 (void *)(unsigned long)ipath->fspath, size);
4452 btrfs_free_path(path);
4459 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4461 struct btrfs_data_container *inodes = ctx;
4462 const size_t c = 3 * sizeof(u64);
4464 if (inodes->bytes_left >= c) {
4465 inodes->bytes_left -= c;
4466 inodes->val[inodes->elem_cnt] = inum;
4467 inodes->val[inodes->elem_cnt + 1] = offset;
4468 inodes->val[inodes->elem_cnt + 2] = root;
4469 inodes->elem_cnt += 3;
4471 inodes->bytes_missing += c - inodes->bytes_left;
4472 inodes->bytes_left = 0;
4473 inodes->elem_missed += 3;
4479 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
4484 struct btrfs_ioctl_logical_ino_args *loi;
4485 struct btrfs_data_container *inodes = NULL;
4486 struct btrfs_path *path = NULL;
4488 if (!capable(CAP_SYS_ADMIN))
4491 loi = memdup_user(arg, sizeof(*loi));
4498 path = btrfs_alloc_path();
4504 size = min_t(u32, loi->size, SZ_64K);
4505 inodes = init_data_container(size);
4506 if (IS_ERR(inodes)) {
4507 ret = PTR_ERR(inodes);
4512 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
4513 build_ino_list, inodes);
4519 ret = copy_to_user((void *)(unsigned long)loi->inodes,
4520 (void *)(unsigned long)inodes, size);
4525 btrfs_free_path(path);
4532 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
4533 struct btrfs_ioctl_balance_args *bargs)
4535 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4537 bargs->flags = bctl->flags;
4539 if (atomic_read(&fs_info->balance_running))
4540 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4541 if (atomic_read(&fs_info->balance_pause_req))
4542 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4543 if (atomic_read(&fs_info->balance_cancel_req))
4544 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4546 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4547 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4548 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4551 spin_lock(&fs_info->balance_lock);
4552 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4553 spin_unlock(&fs_info->balance_lock);
4555 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4559 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4561 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4562 struct btrfs_fs_info *fs_info = root->fs_info;
4563 struct btrfs_ioctl_balance_args *bargs;
4564 struct btrfs_balance_control *bctl;
4565 bool need_unlock; /* for mut. excl. ops lock */
4568 if (!capable(CAP_SYS_ADMIN))
4571 ret = mnt_want_write_file(file);
4576 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4577 mutex_lock(&fs_info->volume_mutex);
4578 mutex_lock(&fs_info->balance_mutex);
4584 * mut. excl. ops lock is locked. Three possibilites:
4585 * (1) some other op is running
4586 * (2) balance is running
4587 * (3) balance is paused -- special case (think resume)
4589 mutex_lock(&fs_info->balance_mutex);
4590 if (fs_info->balance_ctl) {
4591 /* this is either (2) or (3) */
4592 if (!atomic_read(&fs_info->balance_running)) {
4593 mutex_unlock(&fs_info->balance_mutex);
4594 if (!mutex_trylock(&fs_info->volume_mutex))
4596 mutex_lock(&fs_info->balance_mutex);
4598 if (fs_info->balance_ctl &&
4599 !atomic_read(&fs_info->balance_running)) {
4601 need_unlock = false;
4605 mutex_unlock(&fs_info->balance_mutex);
4606 mutex_unlock(&fs_info->volume_mutex);
4610 mutex_unlock(&fs_info->balance_mutex);
4616 mutex_unlock(&fs_info->balance_mutex);
4617 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4622 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4625 bargs = memdup_user(arg, sizeof(*bargs));
4626 if (IS_ERR(bargs)) {
4627 ret = PTR_ERR(bargs);
4631 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4632 if (!fs_info->balance_ctl) {
4637 bctl = fs_info->balance_ctl;
4638 spin_lock(&fs_info->balance_lock);
4639 bctl->flags |= BTRFS_BALANCE_RESUME;
4640 spin_unlock(&fs_info->balance_lock);
4648 if (fs_info->balance_ctl) {
4653 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4659 bctl->fs_info = fs_info;
4661 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4662 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4663 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4665 bctl->flags = bargs->flags;
4667 /* balance everything - no filters */
4668 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4671 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4678 * Ownership of bctl and mutually_exclusive_operation_running
4679 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4680 * or, if restriper was paused all the way until unmount, in
4681 * free_fs_info. mutually_exclusive_operation_running is
4682 * cleared in __cancel_balance.
4684 need_unlock = false;
4686 ret = btrfs_balance(bctl, bargs);
4690 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4699 mutex_unlock(&fs_info->balance_mutex);
4700 mutex_unlock(&fs_info->volume_mutex);
4702 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4704 mnt_drop_write_file(file);
4708 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4710 if (!capable(CAP_SYS_ADMIN))
4714 case BTRFS_BALANCE_CTL_PAUSE:
4715 return btrfs_pause_balance(root->fs_info);
4716 case BTRFS_BALANCE_CTL_CANCEL:
4717 return btrfs_cancel_balance(root->fs_info);
4723 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4726 struct btrfs_fs_info *fs_info = root->fs_info;
4727 struct btrfs_ioctl_balance_args *bargs;
4730 if (!capable(CAP_SYS_ADMIN))
4733 mutex_lock(&fs_info->balance_mutex);
4734 if (!fs_info->balance_ctl) {
4739 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4745 update_ioctl_balance_args(fs_info, 1, bargs);
4747 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4752 mutex_unlock(&fs_info->balance_mutex);
4756 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4758 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4759 struct btrfs_ioctl_quota_ctl_args *sa;
4760 struct btrfs_trans_handle *trans = NULL;
4764 if (!capable(CAP_SYS_ADMIN))
4767 ret = mnt_want_write_file(file);
4771 sa = memdup_user(arg, sizeof(*sa));
4777 down_write(&root->fs_info->subvol_sem);
4778 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4779 if (IS_ERR(trans)) {
4780 ret = PTR_ERR(trans);
4785 case BTRFS_QUOTA_CTL_ENABLE:
4786 ret = btrfs_quota_enable(trans, root->fs_info);
4788 case BTRFS_QUOTA_CTL_DISABLE:
4789 ret = btrfs_quota_disable(trans, root->fs_info);
4796 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4801 up_write(&root->fs_info->subvol_sem);
4803 mnt_drop_write_file(file);
4807 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4809 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4810 struct btrfs_ioctl_qgroup_assign_args *sa;
4811 struct btrfs_trans_handle *trans;
4815 if (!capable(CAP_SYS_ADMIN))
4818 ret = mnt_want_write_file(file);
4822 sa = memdup_user(arg, sizeof(*sa));
4828 trans = btrfs_join_transaction(root);
4829 if (IS_ERR(trans)) {
4830 ret = PTR_ERR(trans);
4834 /* FIXME: check if the IDs really exist */
4836 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4839 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4843 /* update qgroup status and info */
4844 err = btrfs_run_qgroups(trans, root->fs_info);
4846 btrfs_std_error(root->fs_info, ret,
4847 "failed to update qgroup status and info\n");
4848 err = btrfs_end_transaction(trans, root);
4855 mnt_drop_write_file(file);
4859 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4861 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4862 struct btrfs_ioctl_qgroup_create_args *sa;
4863 struct btrfs_trans_handle *trans;
4867 if (!capable(CAP_SYS_ADMIN))
4870 ret = mnt_want_write_file(file);
4874 sa = memdup_user(arg, sizeof(*sa));
4880 if (!sa->qgroupid) {
4885 trans = btrfs_join_transaction(root);
4886 if (IS_ERR(trans)) {
4887 ret = PTR_ERR(trans);
4891 /* FIXME: check if the IDs really exist */
4893 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid);
4895 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4898 err = btrfs_end_transaction(trans, root);
4905 mnt_drop_write_file(file);
4909 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4911 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4912 struct btrfs_ioctl_qgroup_limit_args *sa;
4913 struct btrfs_trans_handle *trans;
4918 if (!capable(CAP_SYS_ADMIN))
4921 ret = mnt_want_write_file(file);
4925 sa = memdup_user(arg, sizeof(*sa));
4931 trans = btrfs_join_transaction(root);
4932 if (IS_ERR(trans)) {
4933 ret = PTR_ERR(trans);
4937 qgroupid = sa->qgroupid;
4939 /* take the current subvol as qgroup */
4940 qgroupid = root->root_key.objectid;
4943 /* FIXME: check if the IDs really exist */
4944 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4946 err = btrfs_end_transaction(trans, root);
4953 mnt_drop_write_file(file);
4957 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4959 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4960 struct btrfs_ioctl_quota_rescan_args *qsa;
4963 if (!capable(CAP_SYS_ADMIN))
4966 ret = mnt_want_write_file(file);
4970 qsa = memdup_user(arg, sizeof(*qsa));
4981 ret = btrfs_qgroup_rescan(root->fs_info);
4986 mnt_drop_write_file(file);
4990 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4992 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4993 struct btrfs_ioctl_quota_rescan_args *qsa;
4996 if (!capable(CAP_SYS_ADMIN))
4999 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
5003 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
5005 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
5008 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5015 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5017 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5019 if (!capable(CAP_SYS_ADMIN))
5022 return btrfs_qgroup_wait_for_completion(root->fs_info);
5025 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5026 struct btrfs_ioctl_received_subvol_args *sa)
5028 struct inode *inode = file_inode(file);
5029 struct btrfs_root *root = BTRFS_I(inode)->root;
5030 struct btrfs_root_item *root_item = &root->root_item;
5031 struct btrfs_trans_handle *trans;
5032 struct timespec ct = current_fs_time(inode->i_sb);
5034 int received_uuid_changed;
5036 if (!inode_owner_or_capable(inode))
5039 ret = mnt_want_write_file(file);
5043 down_write(&root->fs_info->subvol_sem);
5045 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
5050 if (btrfs_root_readonly(root)) {
5057 * 2 - uuid items (received uuid + subvol uuid)
5059 trans = btrfs_start_transaction(root, 3);
5060 if (IS_ERR(trans)) {
5061 ret = PTR_ERR(trans);
5066 sa->rtransid = trans->transid;
5067 sa->rtime.sec = ct.tv_sec;
5068 sa->rtime.nsec = ct.tv_nsec;
5070 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5072 if (received_uuid_changed &&
5073 !btrfs_is_empty_uuid(root_item->received_uuid))
5074 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
5075 root_item->received_uuid,
5076 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5077 root->root_key.objectid);
5078 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5079 btrfs_set_root_stransid(root_item, sa->stransid);
5080 btrfs_set_root_rtransid(root_item, sa->rtransid);
5081 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5082 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5083 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5084 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5086 ret = btrfs_update_root(trans, root->fs_info->tree_root,
5087 &root->root_key, &root->root_item);
5089 btrfs_end_transaction(trans, root);
5092 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5093 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
5095 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5096 root->root_key.objectid);
5097 if (ret < 0 && ret != -EEXIST) {
5098 btrfs_abort_transaction(trans, root, ret);
5102 ret = btrfs_commit_transaction(trans, root);
5104 btrfs_abort_transaction(trans, root, ret);
5109 up_write(&root->fs_info->subvol_sem);
5110 mnt_drop_write_file(file);
5115 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5118 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5119 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5122 args32 = memdup_user(arg, sizeof(*args32));
5123 if (IS_ERR(args32)) {
5124 ret = PTR_ERR(args32);
5129 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5135 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5136 args64->stransid = args32->stransid;
5137 args64->rtransid = args32->rtransid;
5138 args64->stime.sec = args32->stime.sec;
5139 args64->stime.nsec = args32->stime.nsec;
5140 args64->rtime.sec = args32->rtime.sec;
5141 args64->rtime.nsec = args32->rtime.nsec;
5142 args64->flags = args32->flags;
5144 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5148 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5149 args32->stransid = args64->stransid;
5150 args32->rtransid = args64->rtransid;
5151 args32->stime.sec = args64->stime.sec;
5152 args32->stime.nsec = args64->stime.nsec;
5153 args32->rtime.sec = args64->rtime.sec;
5154 args32->rtime.nsec = args64->rtime.nsec;
5155 args32->flags = args64->flags;
5157 ret = copy_to_user(arg, args32, sizeof(*args32));
5168 static long btrfs_ioctl_set_received_subvol(struct file *file,
5171 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5174 sa = memdup_user(arg, sizeof(*sa));
5181 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5186 ret = copy_to_user(arg, sa, sizeof(*sa));
5195 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5197 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5200 char label[BTRFS_LABEL_SIZE];
5202 spin_lock(&root->fs_info->super_lock);
5203 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5204 spin_unlock(&root->fs_info->super_lock);
5206 len = strnlen(label, BTRFS_LABEL_SIZE);
5208 if (len == BTRFS_LABEL_SIZE) {
5209 btrfs_warn(root->fs_info,
5210 "label is too long, return the first %zu bytes", --len);
5213 ret = copy_to_user(arg, label, len);
5215 return ret ? -EFAULT : 0;
5218 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5220 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5221 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5222 struct btrfs_trans_handle *trans;
5223 char label[BTRFS_LABEL_SIZE];
5226 if (!capable(CAP_SYS_ADMIN))
5229 if (copy_from_user(label, arg, sizeof(label)))
5232 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5233 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
5234 BTRFS_LABEL_SIZE - 1);
5238 ret = mnt_want_write_file(file);
5242 trans = btrfs_start_transaction(root, 0);
5243 if (IS_ERR(trans)) {
5244 ret = PTR_ERR(trans);
5248 spin_lock(&root->fs_info->super_lock);
5249 strcpy(super_block->label, label);
5250 spin_unlock(&root->fs_info->super_lock);
5251 ret = btrfs_commit_transaction(trans, root);
5254 mnt_drop_write_file(file);
5258 #define INIT_FEATURE_FLAGS(suffix) \
5259 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5260 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5261 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5263 int btrfs_ioctl_get_supported_features(void __user *arg)
5265 static const struct btrfs_ioctl_feature_flags features[3] = {
5266 INIT_FEATURE_FLAGS(SUPP),
5267 INIT_FEATURE_FLAGS(SAFE_SET),
5268 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5271 if (copy_to_user(arg, &features, sizeof(features)))
5277 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5279 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5280 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5281 struct btrfs_ioctl_feature_flags features;
5283 features.compat_flags = btrfs_super_compat_flags(super_block);
5284 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5285 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5287 if (copy_to_user(arg, &features, sizeof(features)))
5293 static int check_feature_bits(struct btrfs_root *root,
5294 enum btrfs_feature_set set,
5295 u64 change_mask, u64 flags, u64 supported_flags,
5296 u64 safe_set, u64 safe_clear)
5298 const char *type = btrfs_feature_set_names[set];
5300 u64 disallowed, unsupported;
5301 u64 set_mask = flags & change_mask;
5302 u64 clear_mask = ~flags & change_mask;
5304 unsupported = set_mask & ~supported_flags;
5306 names = btrfs_printable_features(set, unsupported);
5308 btrfs_warn(root->fs_info,
5309 "this kernel does not support the %s feature bit%s",
5310 names, strchr(names, ',') ? "s" : "");
5313 btrfs_warn(root->fs_info,
5314 "this kernel does not support %s bits 0x%llx",
5319 disallowed = set_mask & ~safe_set;
5321 names = btrfs_printable_features(set, disallowed);
5323 btrfs_warn(root->fs_info,
5324 "can't set the %s feature bit%s while mounted",
5325 names, strchr(names, ',') ? "s" : "");
5328 btrfs_warn(root->fs_info,
5329 "can't set %s bits 0x%llx while mounted",
5334 disallowed = clear_mask & ~safe_clear;
5336 names = btrfs_printable_features(set, disallowed);
5338 btrfs_warn(root->fs_info,
5339 "can't clear the %s feature bit%s while mounted",
5340 names, strchr(names, ',') ? "s" : "");
5343 btrfs_warn(root->fs_info,
5344 "can't clear %s bits 0x%llx while mounted",
5352 #define check_feature(root, change_mask, flags, mask_base) \
5353 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5354 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5355 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5356 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5358 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5360 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5361 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5362 struct btrfs_ioctl_feature_flags flags[2];
5363 struct btrfs_trans_handle *trans;
5367 if (!capable(CAP_SYS_ADMIN))
5370 if (copy_from_user(flags, arg, sizeof(flags)))
5374 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5375 !flags[0].incompat_flags)
5378 ret = check_feature(root, flags[0].compat_flags,
5379 flags[1].compat_flags, COMPAT);
5383 ret = check_feature(root, flags[0].compat_ro_flags,
5384 flags[1].compat_ro_flags, COMPAT_RO);
5388 ret = check_feature(root, flags[0].incompat_flags,
5389 flags[1].incompat_flags, INCOMPAT);
5393 trans = btrfs_start_transaction(root, 0);
5395 return PTR_ERR(trans);
5397 spin_lock(&root->fs_info->super_lock);
5398 newflags = btrfs_super_compat_flags(super_block);
5399 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5400 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5401 btrfs_set_super_compat_flags(super_block, newflags);
5403 newflags = btrfs_super_compat_ro_flags(super_block);
5404 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5405 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5406 btrfs_set_super_compat_ro_flags(super_block, newflags);
5408 newflags = btrfs_super_incompat_flags(super_block);
5409 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5410 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5411 btrfs_set_super_incompat_flags(super_block, newflags);
5412 spin_unlock(&root->fs_info->super_lock);
5414 return btrfs_commit_transaction(trans, root);
5417 long btrfs_ioctl(struct file *file, unsigned int
5418 cmd, unsigned long arg)
5420 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5421 void __user *argp = (void __user *)arg;
5424 case FS_IOC_GETFLAGS:
5425 return btrfs_ioctl_getflags(file, argp);
5426 case FS_IOC_SETFLAGS:
5427 return btrfs_ioctl_setflags(file, argp);
5428 case FS_IOC_GETVERSION:
5429 return btrfs_ioctl_getversion(file, argp);
5431 return btrfs_ioctl_fitrim(file, argp);
5432 case BTRFS_IOC_SNAP_CREATE:
5433 return btrfs_ioctl_snap_create(file, argp, 0);
5434 case BTRFS_IOC_SNAP_CREATE_V2:
5435 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5436 case BTRFS_IOC_SUBVOL_CREATE:
5437 return btrfs_ioctl_snap_create(file, argp, 1);
5438 case BTRFS_IOC_SUBVOL_CREATE_V2:
5439 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5440 case BTRFS_IOC_SNAP_DESTROY:
5441 return btrfs_ioctl_snap_destroy(file, argp);
5442 case BTRFS_IOC_SUBVOL_GETFLAGS:
5443 return btrfs_ioctl_subvol_getflags(file, argp);
5444 case BTRFS_IOC_SUBVOL_SETFLAGS:
5445 return btrfs_ioctl_subvol_setflags(file, argp);
5446 case BTRFS_IOC_DEFAULT_SUBVOL:
5447 return btrfs_ioctl_default_subvol(file, argp);
5448 case BTRFS_IOC_DEFRAG:
5449 return btrfs_ioctl_defrag(file, NULL);
5450 case BTRFS_IOC_DEFRAG_RANGE:
5451 return btrfs_ioctl_defrag(file, argp);
5452 case BTRFS_IOC_RESIZE:
5453 return btrfs_ioctl_resize(file, argp);
5454 case BTRFS_IOC_ADD_DEV:
5455 return btrfs_ioctl_add_dev(root, argp);
5456 case BTRFS_IOC_RM_DEV:
5457 return btrfs_ioctl_rm_dev(file, argp);
5458 case BTRFS_IOC_FS_INFO:
5459 return btrfs_ioctl_fs_info(root, argp);
5460 case BTRFS_IOC_DEV_INFO:
5461 return btrfs_ioctl_dev_info(root, argp);
5462 case BTRFS_IOC_BALANCE:
5463 return btrfs_ioctl_balance(file, NULL);
5464 case BTRFS_IOC_TRANS_START:
5465 return btrfs_ioctl_trans_start(file);
5466 case BTRFS_IOC_TRANS_END:
5467 return btrfs_ioctl_trans_end(file);
5468 case BTRFS_IOC_TREE_SEARCH:
5469 return btrfs_ioctl_tree_search(file, argp);
5470 case BTRFS_IOC_TREE_SEARCH_V2:
5471 return btrfs_ioctl_tree_search_v2(file, argp);
5472 case BTRFS_IOC_INO_LOOKUP:
5473 return btrfs_ioctl_ino_lookup(file, argp);
5474 case BTRFS_IOC_INO_PATHS:
5475 return btrfs_ioctl_ino_to_path(root, argp);
5476 case BTRFS_IOC_LOGICAL_INO:
5477 return btrfs_ioctl_logical_to_ino(root, argp);
5478 case BTRFS_IOC_SPACE_INFO:
5479 return btrfs_ioctl_space_info(root, argp);
5480 case BTRFS_IOC_SYNC: {
5483 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
5486 ret = btrfs_sync_fs(file_inode(file)->i_sb, 1);
5488 * The transaction thread may want to do more work,
5489 * namely it pokes the cleaner ktread that will start
5490 * processing uncleaned subvols.
5492 wake_up_process(root->fs_info->transaction_kthread);
5495 case BTRFS_IOC_START_SYNC:
5496 return btrfs_ioctl_start_sync(root, argp);
5497 case BTRFS_IOC_WAIT_SYNC:
5498 return btrfs_ioctl_wait_sync(root, argp);
5499 case BTRFS_IOC_SCRUB:
5500 return btrfs_ioctl_scrub(file, argp);
5501 case BTRFS_IOC_SCRUB_CANCEL:
5502 return btrfs_ioctl_scrub_cancel(root, argp);
5503 case BTRFS_IOC_SCRUB_PROGRESS:
5504 return btrfs_ioctl_scrub_progress(root, argp);
5505 case BTRFS_IOC_BALANCE_V2:
5506 return btrfs_ioctl_balance(file, argp);
5507 case BTRFS_IOC_BALANCE_CTL:
5508 return btrfs_ioctl_balance_ctl(root, arg);
5509 case BTRFS_IOC_BALANCE_PROGRESS:
5510 return btrfs_ioctl_balance_progress(root, argp);
5511 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5512 return btrfs_ioctl_set_received_subvol(file, argp);
5514 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5515 return btrfs_ioctl_set_received_subvol_32(file, argp);
5517 case BTRFS_IOC_SEND:
5518 return btrfs_ioctl_send(file, argp);
5519 case BTRFS_IOC_GET_DEV_STATS:
5520 return btrfs_ioctl_get_dev_stats(root, argp);
5521 case BTRFS_IOC_QUOTA_CTL:
5522 return btrfs_ioctl_quota_ctl(file, argp);
5523 case BTRFS_IOC_QGROUP_ASSIGN:
5524 return btrfs_ioctl_qgroup_assign(file, argp);
5525 case BTRFS_IOC_QGROUP_CREATE:
5526 return btrfs_ioctl_qgroup_create(file, argp);
5527 case BTRFS_IOC_QGROUP_LIMIT:
5528 return btrfs_ioctl_qgroup_limit(file, argp);
5529 case BTRFS_IOC_QUOTA_RESCAN:
5530 return btrfs_ioctl_quota_rescan(file, argp);
5531 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5532 return btrfs_ioctl_quota_rescan_status(file, argp);
5533 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5534 return btrfs_ioctl_quota_rescan_wait(file, argp);
5535 case BTRFS_IOC_DEV_REPLACE:
5536 return btrfs_ioctl_dev_replace(root, argp);
5537 case BTRFS_IOC_GET_FSLABEL:
5538 return btrfs_ioctl_get_fslabel(file, argp);
5539 case BTRFS_IOC_SET_FSLABEL:
5540 return btrfs_ioctl_set_fslabel(file, argp);
5541 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5542 return btrfs_ioctl_get_supported_features(argp);
5543 case BTRFS_IOC_GET_FEATURES:
5544 return btrfs_ioctl_get_features(file, argp);
5545 case BTRFS_IOC_SET_FEATURES:
5546 return btrfs_ioctl_set_features(file, argp);