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"
63 #include "compression.h"
66 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
67 * structures are incorrect, as the timespec structure from userspace
68 * is 4 bytes too small. We define these alternatives here to teach
69 * the kernel about the 32-bit struct packing.
71 struct btrfs_ioctl_timespec_32 {
74 } __attribute__ ((__packed__));
76 struct btrfs_ioctl_received_subvol_args_32 {
77 char uuid[BTRFS_UUID_SIZE]; /* in */
78 __u64 stransid; /* in */
79 __u64 rtransid; /* out */
80 struct btrfs_ioctl_timespec_32 stime; /* in */
81 struct btrfs_ioctl_timespec_32 rtime; /* out */
83 __u64 reserved[16]; /* in */
84 } __attribute__ ((__packed__));
86 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
87 struct btrfs_ioctl_received_subvol_args_32)
91 static int btrfs_clone(struct inode *src, struct inode *inode,
92 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
95 /* Mask out flags that are inappropriate for the given type of inode. */
96 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
100 else if (S_ISREG(mode))
101 return flags & ~FS_DIRSYNC_FL;
103 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
107 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
109 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
111 unsigned int iflags = 0;
113 if (flags & BTRFS_INODE_SYNC)
114 iflags |= FS_SYNC_FL;
115 if (flags & BTRFS_INODE_IMMUTABLE)
116 iflags |= FS_IMMUTABLE_FL;
117 if (flags & BTRFS_INODE_APPEND)
118 iflags |= FS_APPEND_FL;
119 if (flags & BTRFS_INODE_NODUMP)
120 iflags |= FS_NODUMP_FL;
121 if (flags & BTRFS_INODE_NOATIME)
122 iflags |= FS_NOATIME_FL;
123 if (flags & BTRFS_INODE_DIRSYNC)
124 iflags |= FS_DIRSYNC_FL;
125 if (flags & BTRFS_INODE_NODATACOW)
126 iflags |= FS_NOCOW_FL;
128 if (flags & BTRFS_INODE_NOCOMPRESS)
129 iflags |= FS_NOCOMP_FL;
130 else if (flags & BTRFS_INODE_COMPRESS)
131 iflags |= FS_COMPR_FL;
137 * Update inode->i_flags based on the btrfs internal flags.
139 void btrfs_update_iflags(struct inode *inode)
141 struct btrfs_inode *ip = BTRFS_I(inode);
142 unsigned int new_fl = 0;
144 if (ip->flags & BTRFS_INODE_SYNC)
146 if (ip->flags & BTRFS_INODE_IMMUTABLE)
147 new_fl |= S_IMMUTABLE;
148 if (ip->flags & BTRFS_INODE_APPEND)
150 if (ip->flags & BTRFS_INODE_NOATIME)
152 if (ip->flags & BTRFS_INODE_DIRSYNC)
155 set_mask_bits(&inode->i_flags,
156 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
161 * Inherit flags from the parent inode.
163 * Currently only the compression flags and the cow flags are inherited.
165 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
172 flags = BTRFS_I(dir)->flags;
174 if (flags & BTRFS_INODE_NOCOMPRESS) {
175 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
176 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
177 } else if (flags & BTRFS_INODE_COMPRESS) {
178 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
179 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
182 if (flags & BTRFS_INODE_NODATACOW) {
183 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
184 if (S_ISREG(inode->i_mode))
185 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
188 btrfs_update_iflags(inode);
191 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
193 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
194 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
196 if (copy_to_user(arg, &flags, sizeof(flags)))
201 static int check_flags(unsigned int flags)
203 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
204 FS_NOATIME_FL | FS_NODUMP_FL | \
205 FS_SYNC_FL | FS_DIRSYNC_FL | \
206 FS_NOCOMP_FL | FS_COMPR_FL |
210 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
216 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
218 struct inode *inode = file_inode(file);
219 struct btrfs_inode *ip = BTRFS_I(inode);
220 struct btrfs_root *root = ip->root;
221 struct btrfs_trans_handle *trans;
222 unsigned int flags, oldflags;
225 unsigned int i_oldflags;
228 if (!inode_owner_or_capable(inode))
231 if (btrfs_root_readonly(root))
234 if (copy_from_user(&flags, arg, sizeof(flags)))
237 ret = check_flags(flags);
241 ret = mnt_want_write_file(file);
247 ip_oldflags = ip->flags;
248 i_oldflags = inode->i_flags;
249 mode = inode->i_mode;
251 flags = btrfs_mask_flags(inode->i_mode, flags);
252 oldflags = btrfs_flags_to_ioctl(ip->flags);
253 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
254 if (!capable(CAP_LINUX_IMMUTABLE)) {
260 if (flags & FS_SYNC_FL)
261 ip->flags |= BTRFS_INODE_SYNC;
263 ip->flags &= ~BTRFS_INODE_SYNC;
264 if (flags & FS_IMMUTABLE_FL)
265 ip->flags |= BTRFS_INODE_IMMUTABLE;
267 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
268 if (flags & FS_APPEND_FL)
269 ip->flags |= BTRFS_INODE_APPEND;
271 ip->flags &= ~BTRFS_INODE_APPEND;
272 if (flags & FS_NODUMP_FL)
273 ip->flags |= BTRFS_INODE_NODUMP;
275 ip->flags &= ~BTRFS_INODE_NODUMP;
276 if (flags & FS_NOATIME_FL)
277 ip->flags |= BTRFS_INODE_NOATIME;
279 ip->flags &= ~BTRFS_INODE_NOATIME;
280 if (flags & FS_DIRSYNC_FL)
281 ip->flags |= BTRFS_INODE_DIRSYNC;
283 ip->flags &= ~BTRFS_INODE_DIRSYNC;
284 if (flags & FS_NOCOW_FL) {
287 * It's safe to turn csums off here, no extents exist.
288 * Otherwise we want the flag to reflect the real COW
289 * status of the file and will not set it.
291 if (inode->i_size == 0)
292 ip->flags |= BTRFS_INODE_NODATACOW
293 | BTRFS_INODE_NODATASUM;
295 ip->flags |= BTRFS_INODE_NODATACOW;
299 * Revert back under same assumptions as above
302 if (inode->i_size == 0)
303 ip->flags &= ~(BTRFS_INODE_NODATACOW
304 | BTRFS_INODE_NODATASUM);
306 ip->flags &= ~BTRFS_INODE_NODATACOW;
311 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
312 * flag may be changed automatically if compression code won't make
315 if (flags & FS_NOCOMP_FL) {
316 ip->flags &= ~BTRFS_INODE_COMPRESS;
317 ip->flags |= BTRFS_INODE_NOCOMPRESS;
319 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
320 if (ret && ret != -ENODATA)
322 } else if (flags & FS_COMPR_FL) {
325 ip->flags |= BTRFS_INODE_COMPRESS;
326 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
328 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
332 ret = btrfs_set_prop(inode, "btrfs.compression",
333 comp, strlen(comp), 0);
338 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
339 if (ret && ret != -ENODATA)
341 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
344 trans = btrfs_start_transaction(root, 1);
346 ret = PTR_ERR(trans);
350 btrfs_update_iflags(inode);
351 inode_inc_iversion(inode);
352 inode->i_ctime = current_fs_time(inode->i_sb);
353 ret = btrfs_update_inode(trans, root, inode);
355 btrfs_end_transaction(trans, root);
358 ip->flags = ip_oldflags;
359 inode->i_flags = i_oldflags;
364 mnt_drop_write_file(file);
368 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
370 struct inode *inode = file_inode(file);
372 return put_user(inode->i_generation, arg);
375 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
377 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
378 struct btrfs_device *device;
379 struct request_queue *q;
380 struct fstrim_range range;
381 u64 minlen = ULLONG_MAX;
383 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
386 if (!capable(CAP_SYS_ADMIN))
390 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
394 q = bdev_get_queue(device->bdev);
395 if (blk_queue_discard(q)) {
397 minlen = min((u64)q->limits.discard_granularity,
405 if (copy_from_user(&range, arg, sizeof(range)))
407 if (range.start > total_bytes ||
408 range.len < fs_info->sb->s_blocksize)
411 range.len = min(range.len, total_bytes - range.start);
412 range.minlen = max(range.minlen, minlen);
413 ret = btrfs_trim_fs(fs_info->tree_root, &range);
417 if (copy_to_user(arg, &range, sizeof(range)))
423 int btrfs_is_empty_uuid(u8 *uuid)
427 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
434 static noinline int create_subvol(struct inode *dir,
435 struct dentry *dentry,
436 char *name, int namelen,
438 struct btrfs_qgroup_inherit *inherit)
440 struct btrfs_trans_handle *trans;
441 struct btrfs_key key;
442 struct btrfs_root_item *root_item;
443 struct btrfs_inode_item *inode_item;
444 struct extent_buffer *leaf;
445 struct btrfs_root *root = BTRFS_I(dir)->root;
446 struct btrfs_root *new_root;
447 struct btrfs_block_rsv block_rsv;
448 struct timespec cur_time = current_fs_time(dir->i_sb);
453 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
458 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
462 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
467 * Don't create subvolume whose level is not zero. Or qgroup will be
468 * screwed up since it assumes subvolume qgroup's level to be 0.
470 if (btrfs_qgroup_level(objectid)) {
475 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
477 * The same as the snapshot creation, please see the comment
478 * of create_snapshot().
480 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
481 8, &qgroup_reserved, false);
485 trans = btrfs_start_transaction(root, 0);
487 ret = PTR_ERR(trans);
488 btrfs_subvolume_release_metadata(root, &block_rsv,
492 trans->block_rsv = &block_rsv;
493 trans->bytes_reserved = block_rsv.size;
495 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
499 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
505 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
506 btrfs_set_header_bytenr(leaf, leaf->start);
507 btrfs_set_header_generation(leaf, trans->transid);
508 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
509 btrfs_set_header_owner(leaf, objectid);
511 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
513 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
514 btrfs_header_chunk_tree_uuid(leaf),
516 btrfs_mark_buffer_dirty(leaf);
518 inode_item = &root_item->inode;
519 btrfs_set_stack_inode_generation(inode_item, 1);
520 btrfs_set_stack_inode_size(inode_item, 3);
521 btrfs_set_stack_inode_nlink(inode_item, 1);
522 btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
523 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
525 btrfs_set_root_flags(root_item, 0);
526 btrfs_set_root_limit(root_item, 0);
527 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
529 btrfs_set_root_bytenr(root_item, leaf->start);
530 btrfs_set_root_generation(root_item, trans->transid);
531 btrfs_set_root_level(root_item, 0);
532 btrfs_set_root_refs(root_item, 1);
533 btrfs_set_root_used(root_item, leaf->len);
534 btrfs_set_root_last_snapshot(root_item, 0);
536 btrfs_set_root_generation_v2(root_item,
537 btrfs_root_generation(root_item));
538 uuid_le_gen(&new_uuid);
539 memcpy(root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE);
540 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
541 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
542 root_item->ctime = root_item->otime;
543 btrfs_set_root_ctransid(root_item, trans->transid);
544 btrfs_set_root_otransid(root_item, trans->transid);
546 btrfs_tree_unlock(leaf);
547 free_extent_buffer(leaf);
550 btrfs_set_root_dirid(root_item, new_dirid);
552 key.objectid = objectid;
554 key.type = BTRFS_ROOT_ITEM_KEY;
555 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
560 key.offset = (u64)-1;
561 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
562 if (IS_ERR(new_root)) {
563 ret = PTR_ERR(new_root);
564 btrfs_abort_transaction(trans, root, ret);
568 btrfs_record_root_in_trans(trans, new_root);
570 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
572 /* We potentially lose an unused inode item here */
573 btrfs_abort_transaction(trans, root, ret);
577 mutex_lock(&new_root->objectid_mutex);
578 new_root->highest_objectid = new_dirid;
579 mutex_unlock(&new_root->objectid_mutex);
582 * insert the directory item
584 ret = btrfs_set_inode_index(dir, &index);
586 btrfs_abort_transaction(trans, root, ret);
590 ret = btrfs_insert_dir_item(trans, root,
591 name, namelen, dir, &key,
592 BTRFS_FT_DIR, index);
594 btrfs_abort_transaction(trans, root, ret);
598 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
599 ret = btrfs_update_inode(trans, root, dir);
602 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
603 objectid, root->root_key.objectid,
604 btrfs_ino(dir), index, name, namelen);
607 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
608 root_item->uuid, BTRFS_UUID_KEY_SUBVOL,
611 btrfs_abort_transaction(trans, root, ret);
615 trans->block_rsv = NULL;
616 trans->bytes_reserved = 0;
617 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
620 *async_transid = trans->transid;
621 err = btrfs_commit_transaction_async(trans, root, 1);
623 err = btrfs_commit_transaction(trans, root);
625 err = btrfs_commit_transaction(trans, root);
631 inode = btrfs_lookup_dentry(dir, dentry);
633 return PTR_ERR(inode);
634 d_instantiate(dentry, inode);
643 static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root)
649 prepare_to_wait(&root->subv_writers->wait, &wait,
650 TASK_UNINTERRUPTIBLE);
652 writers = percpu_counter_sum(&root->subv_writers->counter);
656 finish_wait(&root->subv_writers->wait, &wait);
660 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
661 struct dentry *dentry, char *name, int namelen,
662 u64 *async_transid, bool readonly,
663 struct btrfs_qgroup_inherit *inherit)
666 struct btrfs_pending_snapshot *pending_snapshot;
667 struct btrfs_trans_handle *trans;
670 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
673 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
674 if (!pending_snapshot)
677 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
679 pending_snapshot->path = btrfs_alloc_path();
680 if (!pending_snapshot->root_item || !pending_snapshot->path) {
685 atomic_inc(&root->will_be_snapshoted);
686 smp_mb__after_atomic();
687 btrfs_wait_for_no_snapshoting_writes(root);
689 ret = btrfs_start_delalloc_inodes(root, 0);
693 btrfs_wait_ordered_extents(root, -1, 0, (u64)-1);
695 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
696 BTRFS_BLOCK_RSV_TEMP);
698 * 1 - parent dir inode
701 * 2 - root ref/backref
702 * 1 - root of snapshot
705 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
706 &pending_snapshot->block_rsv, 8,
707 &pending_snapshot->qgroup_reserved,
712 pending_snapshot->dentry = dentry;
713 pending_snapshot->root = root;
714 pending_snapshot->readonly = readonly;
715 pending_snapshot->dir = dir;
716 pending_snapshot->inherit = inherit;
718 trans = btrfs_start_transaction(root, 0);
720 ret = PTR_ERR(trans);
724 spin_lock(&root->fs_info->trans_lock);
725 list_add(&pending_snapshot->list,
726 &trans->transaction->pending_snapshots);
727 spin_unlock(&root->fs_info->trans_lock);
729 *async_transid = trans->transid;
730 ret = btrfs_commit_transaction_async(trans,
731 root->fs_info->extent_root, 1);
733 ret = btrfs_commit_transaction(trans, root);
735 ret = btrfs_commit_transaction(trans,
736 root->fs_info->extent_root);
741 ret = pending_snapshot->error;
745 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
749 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
751 ret = PTR_ERR(inode);
755 d_instantiate(dentry, inode);
758 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
759 &pending_snapshot->block_rsv,
760 pending_snapshot->qgroup_reserved);
762 if (atomic_dec_and_test(&root->will_be_snapshoted))
763 wake_up_atomic_t(&root->will_be_snapshoted);
765 kfree(pending_snapshot->root_item);
766 btrfs_free_path(pending_snapshot->path);
767 kfree(pending_snapshot);
772 /* copy of may_delete in fs/namei.c()
773 * Check whether we can remove a link victim from directory dir, check
774 * whether the type of victim is right.
775 * 1. We can't do it if dir is read-only (done in permission())
776 * 2. We should have write and exec permissions on dir
777 * 3. We can't remove anything from append-only dir
778 * 4. We can't do anything with immutable dir (done in permission())
779 * 5. If the sticky bit on dir is set we should either
780 * a. be owner of dir, or
781 * b. be owner of victim, or
782 * c. have CAP_FOWNER capability
783 * 6. If the victim is append-only or immutable we can't do anything with
784 * links pointing to it.
785 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
786 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
787 * 9. We can't remove a root or mountpoint.
788 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
789 * nfs_async_unlink().
792 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
796 if (d_really_is_negative(victim))
799 BUG_ON(d_inode(victim->d_parent) != dir);
800 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
802 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
807 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
808 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
811 if (!d_is_dir(victim))
815 } else if (d_is_dir(victim))
819 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
824 /* copy of may_create in fs/namei.c() */
825 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
827 if (d_really_is_positive(child))
831 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
835 * Create a new subvolume below @parent. This is largely modeled after
836 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
837 * inside this filesystem so it's quite a bit simpler.
839 static noinline int btrfs_mksubvol(struct path *parent,
840 char *name, int namelen,
841 struct btrfs_root *snap_src,
842 u64 *async_transid, bool readonly,
843 struct btrfs_qgroup_inherit *inherit)
845 struct inode *dir = d_inode(parent->dentry);
846 struct dentry *dentry;
849 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
853 dentry = lookup_one_len(name, parent->dentry, namelen);
854 error = PTR_ERR(dentry);
858 error = btrfs_may_create(dir, dentry);
863 * even if this name doesn't exist, we may get hash collisions.
864 * check for them now when we can safely fail
866 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
872 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
874 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
878 error = create_snapshot(snap_src, dir, dentry, name, namelen,
879 async_transid, readonly, inherit);
881 error = create_subvol(dir, dentry, name, namelen,
882 async_transid, inherit);
885 fsnotify_mkdir(dir, dentry);
887 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
896 * When we're defragging a range, we don't want to kick it off again
897 * if it is really just waiting for delalloc to send it down.
898 * If we find a nice big extent or delalloc range for the bytes in the
899 * file you want to defrag, we return 0 to let you know to skip this
902 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
904 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
905 struct extent_map *em = NULL;
906 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
909 read_lock(&em_tree->lock);
910 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
911 read_unlock(&em_tree->lock);
914 end = extent_map_end(em);
916 if (end - offset > thresh)
919 /* if we already have a nice delalloc here, just stop */
921 end = count_range_bits(io_tree, &offset, offset + thresh,
922 thresh, EXTENT_DELALLOC, 1);
929 * helper function to walk through a file and find extents
930 * newer than a specific transid, and smaller than thresh.
932 * This is used by the defragging code to find new and small
935 static int find_new_extents(struct btrfs_root *root,
936 struct inode *inode, u64 newer_than,
937 u64 *off, u32 thresh)
939 struct btrfs_path *path;
940 struct btrfs_key min_key;
941 struct extent_buffer *leaf;
942 struct btrfs_file_extent_item *extent;
945 u64 ino = btrfs_ino(inode);
947 path = btrfs_alloc_path();
951 min_key.objectid = ino;
952 min_key.type = BTRFS_EXTENT_DATA_KEY;
953 min_key.offset = *off;
956 ret = btrfs_search_forward(root, &min_key, path, newer_than);
960 if (min_key.objectid != ino)
962 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
965 leaf = path->nodes[0];
966 extent = btrfs_item_ptr(leaf, path->slots[0],
967 struct btrfs_file_extent_item);
969 type = btrfs_file_extent_type(leaf, extent);
970 if (type == BTRFS_FILE_EXTENT_REG &&
971 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
972 check_defrag_in_cache(inode, min_key.offset, thresh)) {
973 *off = min_key.offset;
974 btrfs_free_path(path);
979 if (path->slots[0] < btrfs_header_nritems(leaf)) {
980 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
984 if (min_key.offset == (u64)-1)
988 btrfs_release_path(path);
991 btrfs_free_path(path);
995 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
997 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
998 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
999 struct extent_map *em;
1000 u64 len = PAGE_SIZE;
1003 * hopefully we have this extent in the tree already, try without
1004 * the full extent lock
1006 read_lock(&em_tree->lock);
1007 em = lookup_extent_mapping(em_tree, start, len);
1008 read_unlock(&em_tree->lock);
1011 struct extent_state *cached = NULL;
1012 u64 end = start + len - 1;
1014 /* get the big lock and read metadata off disk */
1015 lock_extent_bits(io_tree, start, end, &cached);
1016 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1017 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
1026 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1028 struct extent_map *next;
1031 /* this is the last extent */
1032 if (em->start + em->len >= i_size_read(inode))
1035 next = defrag_lookup_extent(inode, em->start + em->len);
1036 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1038 else if ((em->block_start + em->block_len == next->block_start) &&
1039 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1042 free_extent_map(next);
1046 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1047 u64 *last_len, u64 *skip, u64 *defrag_end,
1050 struct extent_map *em;
1052 bool next_mergeable = true;
1053 bool prev_mergeable = true;
1056 * make sure that once we start defragging an extent, we keep on
1059 if (start < *defrag_end)
1064 em = defrag_lookup_extent(inode, start);
1068 /* this will cover holes, and inline extents */
1069 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1075 prev_mergeable = false;
1077 next_mergeable = defrag_check_next_extent(inode, em);
1079 * we hit a real extent, if it is big or the next extent is not a
1080 * real extent, don't bother defragging it
1082 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1083 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1087 * last_len ends up being a counter of how many bytes we've defragged.
1088 * every time we choose not to defrag an extent, we reset *last_len
1089 * so that the next tiny extent will force a defrag.
1091 * The end result of this is that tiny extents before a single big
1092 * extent will force at least part of that big extent to be defragged.
1095 *defrag_end = extent_map_end(em);
1098 *skip = extent_map_end(em);
1102 free_extent_map(em);
1107 * it doesn't do much good to defrag one or two pages
1108 * at a time. This pulls in a nice chunk of pages
1109 * to COW and defrag.
1111 * It also makes sure the delalloc code has enough
1112 * dirty data to avoid making new small extents as part
1115 * It's a good idea to start RA on this range
1116 * before calling this.
1118 static int cluster_pages_for_defrag(struct inode *inode,
1119 struct page **pages,
1120 unsigned long start_index,
1121 unsigned long num_pages)
1123 unsigned long file_end;
1124 u64 isize = i_size_read(inode);
1131 struct btrfs_ordered_extent *ordered;
1132 struct extent_state *cached_state = NULL;
1133 struct extent_io_tree *tree;
1134 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1136 file_end = (isize - 1) >> PAGE_SHIFT;
1137 if (!isize || start_index > file_end)
1140 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1142 ret = btrfs_delalloc_reserve_space(inode,
1143 start_index << PAGE_SHIFT,
1144 page_cnt << PAGE_SHIFT);
1148 tree = &BTRFS_I(inode)->io_tree;
1150 /* step one, lock all the pages */
1151 for (i = 0; i < page_cnt; i++) {
1154 page = find_or_create_page(inode->i_mapping,
1155 start_index + i, mask);
1159 page_start = page_offset(page);
1160 page_end = page_start + PAGE_SIZE - 1;
1162 lock_extent_bits(tree, page_start, page_end,
1164 ordered = btrfs_lookup_ordered_extent(inode,
1166 unlock_extent_cached(tree, page_start, page_end,
1167 &cached_state, GFP_NOFS);
1172 btrfs_start_ordered_extent(inode, ordered, 1);
1173 btrfs_put_ordered_extent(ordered);
1176 * we unlocked the page above, so we need check if
1177 * it was released or not.
1179 if (page->mapping != inode->i_mapping) {
1186 if (!PageUptodate(page)) {
1187 btrfs_readpage(NULL, page);
1189 if (!PageUptodate(page)) {
1197 if (page->mapping != inode->i_mapping) {
1209 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1213 * so now we have a nice long stream of locked
1214 * and up to date pages, lets wait on them
1216 for (i = 0; i < i_done; i++)
1217 wait_on_page_writeback(pages[i]);
1219 page_start = page_offset(pages[0]);
1220 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
1222 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1223 page_start, page_end - 1, &cached_state);
1224 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1225 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1226 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1227 &cached_state, GFP_NOFS);
1229 if (i_done != page_cnt) {
1230 spin_lock(&BTRFS_I(inode)->lock);
1231 BTRFS_I(inode)->outstanding_extents++;
1232 spin_unlock(&BTRFS_I(inode)->lock);
1233 btrfs_delalloc_release_space(inode,
1234 start_index << PAGE_SHIFT,
1235 (page_cnt - i_done) << PAGE_SHIFT);
1239 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1242 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1243 page_start, page_end - 1, &cached_state,
1246 for (i = 0; i < i_done; i++) {
1247 clear_page_dirty_for_io(pages[i]);
1248 ClearPageChecked(pages[i]);
1249 set_page_extent_mapped(pages[i]);
1250 set_page_dirty(pages[i]);
1251 unlock_page(pages[i]);
1256 for (i = 0; i < i_done; i++) {
1257 unlock_page(pages[i]);
1260 btrfs_delalloc_release_space(inode,
1261 start_index << PAGE_SHIFT,
1262 page_cnt << PAGE_SHIFT);
1267 int btrfs_defrag_file(struct inode *inode, struct file *file,
1268 struct btrfs_ioctl_defrag_range_args *range,
1269 u64 newer_than, unsigned long max_to_defrag)
1271 struct btrfs_root *root = BTRFS_I(inode)->root;
1272 struct file_ra_state *ra = NULL;
1273 unsigned long last_index;
1274 u64 isize = i_size_read(inode);
1278 u64 newer_off = range->start;
1280 unsigned long ra_index = 0;
1282 int defrag_count = 0;
1283 int compress_type = BTRFS_COMPRESS_ZLIB;
1284 u32 extent_thresh = range->extent_thresh;
1285 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1286 unsigned long cluster = max_cluster;
1287 u64 new_align = ~((u64)SZ_128K - 1);
1288 struct page **pages = NULL;
1293 if (range->start >= isize)
1296 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1297 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1299 if (range->compress_type)
1300 compress_type = range->compress_type;
1303 if (extent_thresh == 0)
1304 extent_thresh = SZ_256K;
1307 * if we were not given a file, allocate a readahead
1311 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1314 file_ra_state_init(ra, inode->i_mapping);
1319 pages = kmalloc_array(max_cluster, sizeof(struct page *),
1326 /* find the last page to defrag */
1327 if (range->start + range->len > range->start) {
1328 last_index = min_t(u64, isize - 1,
1329 range->start + range->len - 1) >> PAGE_SHIFT;
1331 last_index = (isize - 1) >> PAGE_SHIFT;
1335 ret = find_new_extents(root, inode, newer_than,
1336 &newer_off, SZ_64K);
1338 range->start = newer_off;
1340 * we always align our defrag to help keep
1341 * the extents in the file evenly spaced
1343 i = (newer_off & new_align) >> PAGE_SHIFT;
1347 i = range->start >> PAGE_SHIFT;
1350 max_to_defrag = last_index - i + 1;
1353 * make writeback starts from i, so the defrag range can be
1354 * written sequentially.
1356 if (i < inode->i_mapping->writeback_index)
1357 inode->i_mapping->writeback_index = i;
1359 while (i <= last_index && defrag_count < max_to_defrag &&
1360 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
1362 * make sure we stop running if someone unmounts
1365 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1368 if (btrfs_defrag_cancelled(root->fs_info)) {
1369 btrfs_debug(root->fs_info, "defrag_file cancelled");
1374 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
1375 extent_thresh, &last_len, &skip,
1376 &defrag_end, range->flags &
1377 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1380 * the should_defrag function tells us how much to skip
1381 * bump our counter by the suggested amount
1383 next = DIV_ROUND_UP(skip, PAGE_SIZE);
1384 i = max(i + 1, next);
1389 cluster = (PAGE_ALIGN(defrag_end) >>
1391 cluster = min(cluster, max_cluster);
1393 cluster = max_cluster;
1396 if (i + cluster > ra_index) {
1397 ra_index = max(i, ra_index);
1398 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1400 ra_index += cluster;
1404 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1405 BTRFS_I(inode)->force_compress = compress_type;
1406 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1408 inode_unlock(inode);
1412 defrag_count += ret;
1413 balance_dirty_pages_ratelimited(inode->i_mapping);
1414 inode_unlock(inode);
1417 if (newer_off == (u64)-1)
1423 newer_off = max(newer_off + 1,
1424 (u64)i << PAGE_SHIFT);
1426 ret = find_new_extents(root, inode, newer_than,
1427 &newer_off, SZ_64K);
1429 range->start = newer_off;
1430 i = (newer_off & new_align) >> PAGE_SHIFT;
1437 last_len += ret << PAGE_SHIFT;
1445 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1446 filemap_flush(inode->i_mapping);
1447 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1448 &BTRFS_I(inode)->runtime_flags))
1449 filemap_flush(inode->i_mapping);
1452 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1453 /* the filemap_flush will queue IO into the worker threads, but
1454 * we have to make sure the IO is actually started and that
1455 * ordered extents get created before we return
1457 atomic_inc(&root->fs_info->async_submit_draining);
1458 while (atomic_read(&root->fs_info->nr_async_submits) ||
1459 atomic_read(&root->fs_info->async_delalloc_pages)) {
1460 wait_event(root->fs_info->async_submit_wait,
1461 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1462 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1464 atomic_dec(&root->fs_info->async_submit_draining);
1467 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1468 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1474 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1476 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1477 inode_unlock(inode);
1485 static noinline int btrfs_ioctl_resize(struct file *file,
1491 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1492 struct btrfs_ioctl_vol_args *vol_args;
1493 struct btrfs_trans_handle *trans;
1494 struct btrfs_device *device = NULL;
1497 char *devstr = NULL;
1501 if (!capable(CAP_SYS_ADMIN))
1504 ret = mnt_want_write_file(file);
1508 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1510 mnt_drop_write_file(file);
1511 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1514 mutex_lock(&root->fs_info->volume_mutex);
1515 vol_args = memdup_user(arg, sizeof(*vol_args));
1516 if (IS_ERR(vol_args)) {
1517 ret = PTR_ERR(vol_args);
1521 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1523 sizestr = vol_args->name;
1524 devstr = strchr(sizestr, ':');
1526 sizestr = devstr + 1;
1528 devstr = vol_args->name;
1529 ret = kstrtoull(devstr, 10, &devid);
1536 btrfs_info(root->fs_info, "resizing devid %llu", devid);
1539 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1541 btrfs_info(root->fs_info, "resizer unable to find device %llu",
1547 if (!device->writeable) {
1548 btrfs_info(root->fs_info,
1549 "resizer unable to apply on readonly device %llu",
1555 if (!strcmp(sizestr, "max"))
1556 new_size = device->bdev->bd_inode->i_size;
1558 if (sizestr[0] == '-') {
1561 } else if (sizestr[0] == '+') {
1565 new_size = memparse(sizestr, &retptr);
1566 if (*retptr != '\0' || new_size == 0) {
1572 if (device->is_tgtdev_for_dev_replace) {
1577 old_size = btrfs_device_get_total_bytes(device);
1580 if (new_size > old_size) {
1584 new_size = old_size - new_size;
1585 } else if (mod > 0) {
1586 if (new_size > ULLONG_MAX - old_size) {
1590 new_size = old_size + new_size;
1593 if (new_size < SZ_256M) {
1597 if (new_size > device->bdev->bd_inode->i_size) {
1602 new_size = div_u64(new_size, root->sectorsize);
1603 new_size *= root->sectorsize;
1605 btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu",
1606 rcu_str_deref(device->name), new_size);
1608 if (new_size > old_size) {
1609 trans = btrfs_start_transaction(root, 0);
1610 if (IS_ERR(trans)) {
1611 ret = PTR_ERR(trans);
1614 ret = btrfs_grow_device(trans, device, new_size);
1615 btrfs_commit_transaction(trans, root);
1616 } else if (new_size < old_size) {
1617 ret = btrfs_shrink_device(device, new_size);
1618 } /* equal, nothing need to do */
1623 mutex_unlock(&root->fs_info->volume_mutex);
1624 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1625 mnt_drop_write_file(file);
1629 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1630 char *name, unsigned long fd, int subvol,
1631 u64 *transid, bool readonly,
1632 struct btrfs_qgroup_inherit *inherit)
1637 ret = mnt_want_write_file(file);
1641 namelen = strlen(name);
1642 if (strchr(name, '/')) {
1644 goto out_drop_write;
1647 if (name[0] == '.' &&
1648 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1650 goto out_drop_write;
1654 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1655 NULL, transid, readonly, inherit);
1657 struct fd src = fdget(fd);
1658 struct inode *src_inode;
1661 goto out_drop_write;
1664 src_inode = file_inode(src.file);
1665 if (src_inode->i_sb != file_inode(file)->i_sb) {
1666 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1667 "Snapshot src from another FS");
1669 } else if (!inode_owner_or_capable(src_inode)) {
1671 * Subvolume creation is not restricted, but snapshots
1672 * are limited to own subvolumes only
1676 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1677 BTRFS_I(src_inode)->root,
1678 transid, readonly, inherit);
1683 mnt_drop_write_file(file);
1688 static noinline int btrfs_ioctl_snap_create(struct file *file,
1689 void __user *arg, int subvol)
1691 struct btrfs_ioctl_vol_args *vol_args;
1694 vol_args = memdup_user(arg, sizeof(*vol_args));
1695 if (IS_ERR(vol_args))
1696 return PTR_ERR(vol_args);
1697 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1699 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1700 vol_args->fd, subvol,
1707 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1708 void __user *arg, int subvol)
1710 struct btrfs_ioctl_vol_args_v2 *vol_args;
1714 bool readonly = false;
1715 struct btrfs_qgroup_inherit *inherit = NULL;
1717 vol_args = memdup_user(arg, sizeof(*vol_args));
1718 if (IS_ERR(vol_args))
1719 return PTR_ERR(vol_args);
1720 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1722 if (vol_args->flags &
1723 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1724 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1729 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1731 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1733 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1734 if (vol_args->size > PAGE_SIZE) {
1738 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1739 if (IS_ERR(inherit)) {
1740 ret = PTR_ERR(inherit);
1745 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1746 vol_args->fd, subvol, ptr,
1751 if (ptr && copy_to_user(arg +
1752 offsetof(struct btrfs_ioctl_vol_args_v2,
1764 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1767 struct inode *inode = file_inode(file);
1768 struct btrfs_root *root = BTRFS_I(inode)->root;
1772 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1775 down_read(&root->fs_info->subvol_sem);
1776 if (btrfs_root_readonly(root))
1777 flags |= BTRFS_SUBVOL_RDONLY;
1778 up_read(&root->fs_info->subvol_sem);
1780 if (copy_to_user(arg, &flags, sizeof(flags)))
1786 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1789 struct inode *inode = file_inode(file);
1790 struct btrfs_root *root = BTRFS_I(inode)->root;
1791 struct btrfs_trans_handle *trans;
1796 if (!inode_owner_or_capable(inode))
1799 ret = mnt_want_write_file(file);
1803 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1805 goto out_drop_write;
1808 if (copy_from_user(&flags, arg, sizeof(flags))) {
1810 goto out_drop_write;
1813 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1815 goto out_drop_write;
1818 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1820 goto out_drop_write;
1823 down_write(&root->fs_info->subvol_sem);
1826 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1829 root_flags = btrfs_root_flags(&root->root_item);
1830 if (flags & BTRFS_SUBVOL_RDONLY) {
1831 btrfs_set_root_flags(&root->root_item,
1832 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1835 * Block RO -> RW transition if this subvolume is involved in
1838 spin_lock(&root->root_item_lock);
1839 if (root->send_in_progress == 0) {
1840 btrfs_set_root_flags(&root->root_item,
1841 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1842 spin_unlock(&root->root_item_lock);
1844 spin_unlock(&root->root_item_lock);
1845 btrfs_warn(root->fs_info,
1846 "Attempt to set subvolume %llu read-write during send",
1847 root->root_key.objectid);
1853 trans = btrfs_start_transaction(root, 1);
1854 if (IS_ERR(trans)) {
1855 ret = PTR_ERR(trans);
1859 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1860 &root->root_key, &root->root_item);
1862 btrfs_commit_transaction(trans, root);
1865 btrfs_set_root_flags(&root->root_item, root_flags);
1867 up_write(&root->fs_info->subvol_sem);
1869 mnt_drop_write_file(file);
1875 * helper to check if the subvolume references other subvolumes
1877 static noinline int may_destroy_subvol(struct btrfs_root *root)
1879 struct btrfs_path *path;
1880 struct btrfs_dir_item *di;
1881 struct btrfs_key key;
1885 path = btrfs_alloc_path();
1889 /* Make sure this root isn't set as the default subvol */
1890 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1891 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1892 dir_id, "default", 7, 0);
1893 if (di && !IS_ERR(di)) {
1894 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1895 if (key.objectid == root->root_key.objectid) {
1897 btrfs_err(root->fs_info, "deleting default subvolume "
1898 "%llu is not allowed", key.objectid);
1901 btrfs_release_path(path);
1904 key.objectid = root->root_key.objectid;
1905 key.type = BTRFS_ROOT_REF_KEY;
1906 key.offset = (u64)-1;
1908 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1915 if (path->slots[0] > 0) {
1917 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1918 if (key.objectid == root->root_key.objectid &&
1919 key.type == BTRFS_ROOT_REF_KEY)
1923 btrfs_free_path(path);
1927 static noinline int key_in_sk(struct btrfs_key *key,
1928 struct btrfs_ioctl_search_key *sk)
1930 struct btrfs_key test;
1933 test.objectid = sk->min_objectid;
1934 test.type = sk->min_type;
1935 test.offset = sk->min_offset;
1937 ret = btrfs_comp_cpu_keys(key, &test);
1941 test.objectid = sk->max_objectid;
1942 test.type = sk->max_type;
1943 test.offset = sk->max_offset;
1945 ret = btrfs_comp_cpu_keys(key, &test);
1951 static noinline int copy_to_sk(struct btrfs_root *root,
1952 struct btrfs_path *path,
1953 struct btrfs_key *key,
1954 struct btrfs_ioctl_search_key *sk,
1957 unsigned long *sk_offset,
1961 struct extent_buffer *leaf;
1962 struct btrfs_ioctl_search_header sh;
1963 struct btrfs_key test;
1964 unsigned long item_off;
1965 unsigned long item_len;
1971 leaf = path->nodes[0];
1972 slot = path->slots[0];
1973 nritems = btrfs_header_nritems(leaf);
1975 if (btrfs_header_generation(leaf) > sk->max_transid) {
1979 found_transid = btrfs_header_generation(leaf);
1981 for (i = slot; i < nritems; i++) {
1982 item_off = btrfs_item_ptr_offset(leaf, i);
1983 item_len = btrfs_item_size_nr(leaf, i);
1985 btrfs_item_key_to_cpu(leaf, key, i);
1986 if (!key_in_sk(key, sk))
1989 if (sizeof(sh) + item_len > *buf_size) {
1996 * return one empty item back for v1, which does not
2000 *buf_size = sizeof(sh) + item_len;
2005 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2010 sh.objectid = key->objectid;
2011 sh.offset = key->offset;
2012 sh.type = key->type;
2014 sh.transid = found_transid;
2016 /* copy search result header */
2017 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2022 *sk_offset += sizeof(sh);
2025 char __user *up = ubuf + *sk_offset;
2027 if (read_extent_buffer_to_user(leaf, up,
2028 item_off, item_len)) {
2033 *sk_offset += item_len;
2037 if (ret) /* -EOVERFLOW from above */
2040 if (*num_found >= sk->nr_items) {
2047 test.objectid = sk->max_objectid;
2048 test.type = sk->max_type;
2049 test.offset = sk->max_offset;
2050 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2052 else if (key->offset < (u64)-1)
2054 else if (key->type < (u8)-1) {
2057 } else if (key->objectid < (u64)-1) {
2065 * 0: all items from this leaf copied, continue with next
2066 * 1: * more items can be copied, but unused buffer is too small
2067 * * all items were found
2068 * Either way, it will stops the loop which iterates to the next
2070 * -EOVERFLOW: item was to large for buffer
2071 * -EFAULT: could not copy extent buffer back to userspace
2076 static noinline int search_ioctl(struct inode *inode,
2077 struct btrfs_ioctl_search_key *sk,
2081 struct btrfs_root *root;
2082 struct btrfs_key key;
2083 struct btrfs_path *path;
2084 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2087 unsigned long sk_offset = 0;
2089 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2090 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2094 path = btrfs_alloc_path();
2098 if (sk->tree_id == 0) {
2099 /* search the root of the inode that was passed */
2100 root = BTRFS_I(inode)->root;
2102 key.objectid = sk->tree_id;
2103 key.type = BTRFS_ROOT_ITEM_KEY;
2104 key.offset = (u64)-1;
2105 root = btrfs_read_fs_root_no_name(info, &key);
2107 btrfs_free_path(path);
2112 key.objectid = sk->min_objectid;
2113 key.type = sk->min_type;
2114 key.offset = sk->min_offset;
2117 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2123 ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
2124 &sk_offset, &num_found);
2125 btrfs_release_path(path);
2133 sk->nr_items = num_found;
2134 btrfs_free_path(path);
2138 static noinline int btrfs_ioctl_tree_search(struct file *file,
2141 struct btrfs_ioctl_search_args __user *uargs;
2142 struct btrfs_ioctl_search_key sk;
2143 struct inode *inode;
2147 if (!capable(CAP_SYS_ADMIN))
2150 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2152 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2155 buf_size = sizeof(uargs->buf);
2157 inode = file_inode(file);
2158 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2161 * In the origin implementation an overflow is handled by returning a
2162 * search header with a len of zero, so reset ret.
2164 if (ret == -EOVERFLOW)
2167 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2172 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2175 struct btrfs_ioctl_search_args_v2 __user *uarg;
2176 struct btrfs_ioctl_search_args_v2 args;
2177 struct inode *inode;
2180 const size_t buf_limit = SZ_16M;
2182 if (!capable(CAP_SYS_ADMIN))
2185 /* copy search header and buffer size */
2186 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2187 if (copy_from_user(&args, uarg, sizeof(args)))
2190 buf_size = args.buf_size;
2192 if (buf_size < sizeof(struct btrfs_ioctl_search_header))
2195 /* limit result size to 16MB */
2196 if (buf_size > buf_limit)
2197 buf_size = buf_limit;
2199 inode = file_inode(file);
2200 ret = search_ioctl(inode, &args.key, &buf_size,
2201 (char *)(&uarg->buf[0]));
2202 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2204 else if (ret == -EOVERFLOW &&
2205 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2212 * Search INODE_REFs to identify path name of 'dirid' directory
2213 * in a 'tree_id' tree. and sets path name to 'name'.
2215 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2216 u64 tree_id, u64 dirid, char *name)
2218 struct btrfs_root *root;
2219 struct btrfs_key key;
2225 struct btrfs_inode_ref *iref;
2226 struct extent_buffer *l;
2227 struct btrfs_path *path;
2229 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2234 path = btrfs_alloc_path();
2238 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2240 key.objectid = tree_id;
2241 key.type = BTRFS_ROOT_ITEM_KEY;
2242 key.offset = (u64)-1;
2243 root = btrfs_read_fs_root_no_name(info, &key);
2245 btrfs_err(info, "could not find root %llu", tree_id);
2250 key.objectid = dirid;
2251 key.type = BTRFS_INODE_REF_KEY;
2252 key.offset = (u64)-1;
2255 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2259 ret = btrfs_previous_item(root, path, dirid,
2260 BTRFS_INODE_REF_KEY);
2270 slot = path->slots[0];
2271 btrfs_item_key_to_cpu(l, &key, slot);
2273 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2274 len = btrfs_inode_ref_name_len(l, iref);
2276 total_len += len + 1;
2278 ret = -ENAMETOOLONG;
2283 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2285 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2288 btrfs_release_path(path);
2289 key.objectid = key.offset;
2290 key.offset = (u64)-1;
2291 dirid = key.objectid;
2293 memmove(name, ptr, total_len);
2294 name[total_len] = '\0';
2297 btrfs_free_path(path);
2301 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2304 struct btrfs_ioctl_ino_lookup_args *args;
2305 struct inode *inode;
2308 args = memdup_user(argp, sizeof(*args));
2310 return PTR_ERR(args);
2312 inode = file_inode(file);
2315 * Unprivileged query to obtain the containing subvolume root id. The
2316 * path is reset so it's consistent with btrfs_search_path_in_tree.
2318 if (args->treeid == 0)
2319 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2321 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2326 if (!capable(CAP_SYS_ADMIN)) {
2331 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2332 args->treeid, args->objectid,
2336 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2343 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2346 struct dentry *parent = file->f_path.dentry;
2347 struct dentry *dentry;
2348 struct inode *dir = d_inode(parent);
2349 struct inode *inode;
2350 struct btrfs_root *root = BTRFS_I(dir)->root;
2351 struct btrfs_root *dest = NULL;
2352 struct btrfs_ioctl_vol_args *vol_args;
2353 struct btrfs_trans_handle *trans;
2354 struct btrfs_block_rsv block_rsv;
2356 u64 qgroup_reserved;
2361 vol_args = memdup_user(arg, sizeof(*vol_args));
2362 if (IS_ERR(vol_args))
2363 return PTR_ERR(vol_args);
2365 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2366 namelen = strlen(vol_args->name);
2367 if (strchr(vol_args->name, '/') ||
2368 strncmp(vol_args->name, "..", namelen) == 0) {
2373 err = mnt_want_write_file(file);
2378 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
2380 goto out_drop_write;
2381 dentry = lookup_one_len(vol_args->name, parent, namelen);
2382 if (IS_ERR(dentry)) {
2383 err = PTR_ERR(dentry);
2384 goto out_unlock_dir;
2387 if (d_really_is_negative(dentry)) {
2392 inode = d_inode(dentry);
2393 dest = BTRFS_I(inode)->root;
2394 if (!capable(CAP_SYS_ADMIN)) {
2396 * Regular user. Only allow this with a special mount
2397 * option, when the user has write+exec access to the
2398 * subvol root, and when rmdir(2) would have been
2401 * Note that this is _not_ check that the subvol is
2402 * empty or doesn't contain data that we wouldn't
2403 * otherwise be able to delete.
2405 * Users who want to delete empty subvols should try
2409 if (!btrfs_test_opt(root->fs_info, USER_SUBVOL_RM_ALLOWED))
2413 * Do not allow deletion if the parent dir is the same
2414 * as the dir to be deleted. That means the ioctl
2415 * must be called on the dentry referencing the root
2416 * of the subvol, not a random directory contained
2423 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2428 /* check if subvolume may be deleted by a user */
2429 err = btrfs_may_delete(dir, dentry, 1);
2433 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2441 * Don't allow to delete a subvolume with send in progress. This is
2442 * inside the i_mutex so the error handling that has to drop the bit
2443 * again is not run concurrently.
2445 spin_lock(&dest->root_item_lock);
2446 root_flags = btrfs_root_flags(&dest->root_item);
2447 if (dest->send_in_progress == 0) {
2448 btrfs_set_root_flags(&dest->root_item,
2449 root_flags | BTRFS_ROOT_SUBVOL_DEAD);
2450 spin_unlock(&dest->root_item_lock);
2452 spin_unlock(&dest->root_item_lock);
2453 btrfs_warn(root->fs_info,
2454 "Attempt to delete subvolume %llu during send",
2455 dest->root_key.objectid);
2457 goto out_unlock_inode;
2460 down_write(&root->fs_info->subvol_sem);
2462 err = may_destroy_subvol(dest);
2466 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2468 * One for dir inode, two for dir entries, two for root
2471 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2472 5, &qgroup_reserved, true);
2476 trans = btrfs_start_transaction(root, 0);
2477 if (IS_ERR(trans)) {
2478 err = PTR_ERR(trans);
2481 trans->block_rsv = &block_rsv;
2482 trans->bytes_reserved = block_rsv.size;
2484 btrfs_record_snapshot_destroy(trans, dir);
2486 ret = btrfs_unlink_subvol(trans, root, dir,
2487 dest->root_key.objectid,
2488 dentry->d_name.name,
2489 dentry->d_name.len);
2492 btrfs_abort_transaction(trans, root, ret);
2496 btrfs_record_root_in_trans(trans, dest);
2498 memset(&dest->root_item.drop_progress, 0,
2499 sizeof(dest->root_item.drop_progress));
2500 dest->root_item.drop_level = 0;
2501 btrfs_set_root_refs(&dest->root_item, 0);
2503 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
2504 ret = btrfs_insert_orphan_item(trans,
2505 root->fs_info->tree_root,
2506 dest->root_key.objectid);
2508 btrfs_abort_transaction(trans, root, ret);
2514 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2515 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2516 dest->root_key.objectid);
2517 if (ret && ret != -ENOENT) {
2518 btrfs_abort_transaction(trans, root, ret);
2522 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2523 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2524 dest->root_item.received_uuid,
2525 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2526 dest->root_key.objectid);
2527 if (ret && ret != -ENOENT) {
2528 btrfs_abort_transaction(trans, root, ret);
2535 trans->block_rsv = NULL;
2536 trans->bytes_reserved = 0;
2537 ret = btrfs_end_transaction(trans, root);
2540 inode->i_flags |= S_DEAD;
2542 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2544 up_write(&root->fs_info->subvol_sem);
2546 spin_lock(&dest->root_item_lock);
2547 root_flags = btrfs_root_flags(&dest->root_item);
2548 btrfs_set_root_flags(&dest->root_item,
2549 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
2550 spin_unlock(&dest->root_item_lock);
2553 inode_unlock(inode);
2555 d_invalidate(dentry);
2556 btrfs_invalidate_inodes(dest);
2558 ASSERT(dest->send_in_progress == 0);
2561 if (dest->ino_cache_inode) {
2562 iput(dest->ino_cache_inode);
2563 dest->ino_cache_inode = NULL;
2571 mnt_drop_write_file(file);
2577 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2579 struct inode *inode = file_inode(file);
2580 struct btrfs_root *root = BTRFS_I(inode)->root;
2581 struct btrfs_ioctl_defrag_range_args *range;
2584 ret = mnt_want_write_file(file);
2588 if (btrfs_root_readonly(root)) {
2593 switch (inode->i_mode & S_IFMT) {
2595 if (!capable(CAP_SYS_ADMIN)) {
2599 ret = btrfs_defrag_root(root);
2602 ret = btrfs_defrag_root(root->fs_info->extent_root);
2605 if (!(file->f_mode & FMODE_WRITE)) {
2610 range = kzalloc(sizeof(*range), GFP_KERNEL);
2617 if (copy_from_user(range, argp,
2623 /* compression requires us to start the IO */
2624 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2625 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2626 range->extent_thresh = (u32)-1;
2629 /* the rest are all set to zero by kzalloc */
2630 range->len = (u64)-1;
2632 ret = btrfs_defrag_file(file_inode(file), file,
2642 mnt_drop_write_file(file);
2646 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2648 struct btrfs_ioctl_vol_args *vol_args;
2651 if (!capable(CAP_SYS_ADMIN))
2654 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2656 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2659 mutex_lock(&root->fs_info->volume_mutex);
2660 vol_args = memdup_user(arg, sizeof(*vol_args));
2661 if (IS_ERR(vol_args)) {
2662 ret = PTR_ERR(vol_args);
2666 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2667 ret = btrfs_init_new_device(root, vol_args->name);
2670 btrfs_info(root->fs_info, "disk added %s",vol_args->name);
2674 mutex_unlock(&root->fs_info->volume_mutex);
2675 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2679 static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
2681 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2682 struct btrfs_ioctl_vol_args_v2 *vol_args;
2685 if (!capable(CAP_SYS_ADMIN))
2688 ret = mnt_want_write_file(file);
2692 vol_args = memdup_user(arg, sizeof(*vol_args));
2693 if (IS_ERR(vol_args)) {
2694 ret = PTR_ERR(vol_args);
2698 /* Check for compatibility reject unknown flags */
2699 if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED)
2702 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2704 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2708 mutex_lock(&root->fs_info->volume_mutex);
2709 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) {
2710 ret = btrfs_rm_device(root, NULL, vol_args->devid);
2712 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
2713 ret = btrfs_rm_device(root, vol_args->name, 0);
2715 mutex_unlock(&root->fs_info->volume_mutex);
2716 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2719 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
2720 btrfs_info(root->fs_info, "device deleted: id %llu",
2723 btrfs_info(root->fs_info, "device deleted: %s",
2729 mnt_drop_write_file(file);
2733 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2735 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2736 struct btrfs_ioctl_vol_args *vol_args;
2739 if (!capable(CAP_SYS_ADMIN))
2742 ret = mnt_want_write_file(file);
2746 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2748 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2749 goto out_drop_write;
2752 vol_args = memdup_user(arg, sizeof(*vol_args));
2753 if (IS_ERR(vol_args)) {
2754 ret = PTR_ERR(vol_args);
2758 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2759 mutex_lock(&root->fs_info->volume_mutex);
2760 ret = btrfs_rm_device(root, vol_args->name, 0);
2761 mutex_unlock(&root->fs_info->volume_mutex);
2764 btrfs_info(root->fs_info, "disk deleted %s",vol_args->name);
2767 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2769 mnt_drop_write_file(file);
2774 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2776 struct btrfs_ioctl_fs_info_args *fi_args;
2777 struct btrfs_device *device;
2778 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2781 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2785 mutex_lock(&fs_devices->device_list_mutex);
2786 fi_args->num_devices = fs_devices->num_devices;
2787 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2789 list_for_each_entry(device, &fs_devices->devices, dev_list) {
2790 if (device->devid > fi_args->max_id)
2791 fi_args->max_id = device->devid;
2793 mutex_unlock(&fs_devices->device_list_mutex);
2795 fi_args->nodesize = root->fs_info->super_copy->nodesize;
2796 fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
2797 fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;
2799 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2806 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2808 struct btrfs_ioctl_dev_info_args *di_args;
2809 struct btrfs_device *dev;
2810 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2812 char *s_uuid = NULL;
2814 di_args = memdup_user(arg, sizeof(*di_args));
2815 if (IS_ERR(di_args))
2816 return PTR_ERR(di_args);
2818 if (!btrfs_is_empty_uuid(di_args->uuid))
2819 s_uuid = di_args->uuid;
2821 mutex_lock(&fs_devices->device_list_mutex);
2822 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2829 di_args->devid = dev->devid;
2830 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2831 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2832 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2834 struct rcu_string *name;
2837 name = rcu_dereference(dev->name);
2838 strncpy(di_args->path, name->str, sizeof(di_args->path));
2840 di_args->path[sizeof(di_args->path) - 1] = 0;
2842 di_args->path[0] = '\0';
2846 mutex_unlock(&fs_devices->device_list_mutex);
2847 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2854 static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
2858 page = grab_cache_page(inode->i_mapping, index);
2860 return ERR_PTR(-ENOMEM);
2862 if (!PageUptodate(page)) {
2865 ret = btrfs_readpage(NULL, page);
2867 return ERR_PTR(ret);
2869 if (!PageUptodate(page)) {
2872 return ERR_PTR(-EIO);
2874 if (page->mapping != inode->i_mapping) {
2877 return ERR_PTR(-EAGAIN);
2884 static int gather_extent_pages(struct inode *inode, struct page **pages,
2885 int num_pages, u64 off)
2888 pgoff_t index = off >> PAGE_SHIFT;
2890 for (i = 0; i < num_pages; i++) {
2892 pages[i] = extent_same_get_page(inode, index + i);
2893 if (IS_ERR(pages[i])) {
2894 int err = PTR_ERR(pages[i]);
2905 static int lock_extent_range(struct inode *inode, u64 off, u64 len,
2906 bool retry_range_locking)
2909 * Do any pending delalloc/csum calculations on inode, one way or
2910 * another, and lock file content.
2911 * The locking order is:
2914 * 2) range in the inode's io tree
2917 struct btrfs_ordered_extent *ordered;
2918 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2919 ordered = btrfs_lookup_first_ordered_extent(inode,
2922 ordered->file_offset + ordered->len <= off ||
2923 ordered->file_offset >= off + len) &&
2924 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2925 off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
2927 btrfs_put_ordered_extent(ordered);
2930 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2932 btrfs_put_ordered_extent(ordered);
2933 if (!retry_range_locking)
2935 btrfs_wait_ordered_range(inode, off, len);
2940 static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
2942 inode_unlock(inode1);
2943 inode_unlock(inode2);
2946 static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
2948 if (inode1 < inode2)
2949 swap(inode1, inode2);
2951 inode_lock_nested(inode1, I_MUTEX_PARENT);
2952 inode_lock_nested(inode2, I_MUTEX_CHILD);
2955 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
2956 struct inode *inode2, u64 loff2, u64 len)
2958 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2959 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2962 static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
2963 struct inode *inode2, u64 loff2, u64 len,
2964 bool retry_range_locking)
2968 if (inode1 < inode2) {
2969 swap(inode1, inode2);
2972 ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
2975 ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
2977 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
2984 struct page **src_pages;
2985 struct page **dst_pages;
2988 static void btrfs_cmp_data_free(struct cmp_pages *cmp)
2993 for (i = 0; i < cmp->num_pages; i++) {
2994 pg = cmp->src_pages[i];
2999 pg = cmp->dst_pages[i];
3005 kfree(cmp->src_pages);
3006 kfree(cmp->dst_pages);
3009 static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
3010 struct inode *dst, u64 dst_loff,
3011 u64 len, struct cmp_pages *cmp)
3014 int num_pages = PAGE_ALIGN(len) >> PAGE_SHIFT;
3015 struct page **src_pgarr, **dst_pgarr;
3018 * We must gather up all the pages before we initiate our
3019 * extent locking. We use an array for the page pointers. Size
3020 * of the array is bounded by len, which is in turn bounded by
3021 * BTRFS_MAX_DEDUPE_LEN.
3023 src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
3024 dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
3025 if (!src_pgarr || !dst_pgarr) {
3030 cmp->num_pages = num_pages;
3031 cmp->src_pages = src_pgarr;
3032 cmp->dst_pages = dst_pgarr;
3034 ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff);
3038 ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff);
3042 btrfs_cmp_data_free(cmp);
3046 static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
3047 u64 dst_loff, u64 len, struct cmp_pages *cmp)
3051 struct page *src_page, *dst_page;
3052 unsigned int cmp_len = PAGE_SIZE;
3053 void *addr, *dst_addr;
3057 if (len < PAGE_SIZE)
3060 BUG_ON(i >= cmp->num_pages);
3062 src_page = cmp->src_pages[i];
3063 dst_page = cmp->dst_pages[i];
3064 ASSERT(PageLocked(src_page));
3065 ASSERT(PageLocked(dst_page));
3067 addr = kmap_atomic(src_page);
3068 dst_addr = kmap_atomic(dst_page);
3070 flush_dcache_page(src_page);
3071 flush_dcache_page(dst_page);
3073 if (memcmp(addr, dst_addr, cmp_len))
3076 kunmap_atomic(addr);
3077 kunmap_atomic(dst_addr);
3089 static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
3093 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
3095 if (off + olen > inode->i_size || off + olen < off)
3098 /* if we extend to eof, continue to block boundary */
3099 if (off + len == inode->i_size)
3100 *plen = len = ALIGN(inode->i_size, bs) - off;
3102 /* Check that we are block aligned - btrfs_clone() requires this */
3103 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
3109 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3110 struct inode *dst, u64 dst_loff)
3114 struct cmp_pages cmp;
3116 u64 same_lock_start = 0;
3117 u64 same_lock_len = 0;
3128 ret = extent_same_check_offsets(src, loff, &len, olen);
3131 ret = extent_same_check_offsets(src, dst_loff, &len, olen);
3136 * Single inode case wants the same checks, except we
3137 * don't want our length pushed out past i_size as
3138 * comparing that data range makes no sense.
3140 * extent_same_check_offsets() will do this for an
3141 * unaligned length at i_size, so catch it here and
3142 * reject the request.
3144 * This effectively means we require aligned extents
3145 * for the single-inode case, whereas the other cases
3146 * allow an unaligned length so long as it ends at
3154 /* Check for overlapping ranges */
3155 if (dst_loff + len > loff && dst_loff < loff + len) {
3160 same_lock_start = min_t(u64, loff, dst_loff);
3161 same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
3163 btrfs_double_inode_lock(src, dst);
3165 ret = extent_same_check_offsets(src, loff, &len, olen);
3169 ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
3174 /* don't make the dst file partly checksummed */
3175 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3176 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
3182 ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);
3187 ret = lock_extent_range(src, same_lock_start, same_lock_len,
3190 ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
3193 * If one of the inodes has dirty pages in the respective range or
3194 * ordered extents, we need to flush dellaloc and wait for all ordered
3195 * extents in the range. We must unlock the pages and the ranges in the
3196 * io trees to avoid deadlocks when flushing delalloc (requires locking
3197 * pages) and when waiting for ordered extents to complete (they require
3200 if (ret == -EAGAIN) {
3202 * Ranges in the io trees already unlocked. Now unlock all
3203 * pages before waiting for all IO to complete.
3205 btrfs_cmp_data_free(&cmp);
3207 btrfs_wait_ordered_range(src, same_lock_start,
3210 btrfs_wait_ordered_range(src, loff, len);
3211 btrfs_wait_ordered_range(dst, dst_loff, len);
3217 /* ranges in the io trees already unlocked */
3218 btrfs_cmp_data_free(&cmp);
3222 /* pass original length for comparison so we stay within i_size */
3223 ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
3225 ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
3228 unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start,
3229 same_lock_start + same_lock_len - 1);
3231 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3233 btrfs_cmp_data_free(&cmp);
3238 btrfs_double_inode_unlock(src, dst);
3243 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3245 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3246 struct file *dst_file, u64 dst_loff)
3248 struct inode *src = file_inode(src_file);
3249 struct inode *dst = file_inode(dst_file);
3250 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3253 if (olen > BTRFS_MAX_DEDUPE_LEN)
3254 olen = BTRFS_MAX_DEDUPE_LEN;
3256 if (WARN_ON_ONCE(bs < PAGE_SIZE)) {
3258 * Btrfs does not support blocksize < page_size. As a
3259 * result, btrfs_cmp_data() won't correctly handle
3260 * this situation without an update.
3265 res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
3271 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3272 struct inode *inode,
3278 struct btrfs_root *root = BTRFS_I(inode)->root;
3281 inode_inc_iversion(inode);
3282 if (!no_time_update)
3283 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
3285 * We round up to the block size at eof when determining which
3286 * extents to clone above, but shouldn't round up the file size.
3288 if (endoff > destoff + olen)
3289 endoff = destoff + olen;
3290 if (endoff > inode->i_size)
3291 btrfs_i_size_write(inode, endoff);
3293 ret = btrfs_update_inode(trans, root, inode);
3295 btrfs_abort_transaction(trans, root, ret);
3296 btrfs_end_transaction(trans, root);
3299 ret = btrfs_end_transaction(trans, root);
3304 static void clone_update_extent_map(struct inode *inode,
3305 const struct btrfs_trans_handle *trans,
3306 const struct btrfs_path *path,
3307 const u64 hole_offset,
3310 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
3311 struct extent_map *em;
3314 em = alloc_extent_map();
3316 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3317 &BTRFS_I(inode)->runtime_flags);
3322 struct btrfs_file_extent_item *fi;
3324 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3325 struct btrfs_file_extent_item);
3326 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3327 em->generation = -1;
3328 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3329 BTRFS_FILE_EXTENT_INLINE)
3330 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3331 &BTRFS_I(inode)->runtime_flags);
3333 em->start = hole_offset;
3335 em->ram_bytes = em->len;
3336 em->orig_start = hole_offset;
3337 em->block_start = EXTENT_MAP_HOLE;
3339 em->orig_block_len = 0;
3340 em->compress_type = BTRFS_COMPRESS_NONE;
3341 em->generation = trans->transid;
3345 write_lock(&em_tree->lock);
3346 ret = add_extent_mapping(em_tree, em, 1);
3347 write_unlock(&em_tree->lock);
3348 if (ret != -EEXIST) {
3349 free_extent_map(em);
3352 btrfs_drop_extent_cache(inode, em->start,
3353 em->start + em->len - 1, 0);
3357 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3358 &BTRFS_I(inode)->runtime_flags);
3362 * Make sure we do not end up inserting an inline extent into a file that has
3363 * already other (non-inline) extents. If a file has an inline extent it can
3364 * not have any other extents and the (single) inline extent must start at the
3365 * file offset 0. Failing to respect these rules will lead to file corruption,
3366 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3368 * We can have extents that have been already written to disk or we can have
3369 * dirty ranges still in delalloc, in which case the extent maps and items are
3370 * created only when we run delalloc, and the delalloc ranges might fall outside
3371 * the range we are currently locking in the inode's io tree. So we check the
3372 * inode's i_size because of that (i_size updates are done while holding the
3373 * i_mutex, which we are holding here).
3374 * We also check to see if the inode has a size not greater than "datal" but has
3375 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3376 * protected against such concurrent fallocate calls by the i_mutex).
3378 * If the file has no extents but a size greater than datal, do not allow the
3379 * copy because we would need turn the inline extent into a non-inline one (even
3380 * with NO_HOLES enabled). If we find our destination inode only has one inline
3381 * extent, just overwrite it with the source inline extent if its size is less
3382 * than the source extent's size, or we could copy the source inline extent's
3383 * data into the destination inode's inline extent if the later is greater then
3386 static int clone_copy_inline_extent(struct inode *src,
3388 struct btrfs_trans_handle *trans,
3389 struct btrfs_path *path,
3390 struct btrfs_key *new_key,
3391 const u64 drop_start,
3397 struct btrfs_root *root = BTRFS_I(dst)->root;
3398 const u64 aligned_end = ALIGN(new_key->offset + datal,
3401 struct btrfs_key key;
3403 if (new_key->offset > 0)
3406 key.objectid = btrfs_ino(dst);
3407 key.type = BTRFS_EXTENT_DATA_KEY;
3409 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3412 } else if (ret > 0) {
3413 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3414 ret = btrfs_next_leaf(root, path);
3418 goto copy_inline_extent;
3420 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3421 if (key.objectid == btrfs_ino(dst) &&
3422 key.type == BTRFS_EXTENT_DATA_KEY) {
3423 ASSERT(key.offset > 0);
3426 } else if (i_size_read(dst) <= datal) {
3427 struct btrfs_file_extent_item *ei;
3431 * If the file size is <= datal, make sure there are no other
3432 * extents following (can happen do to an fallocate call with
3433 * the flag FALLOC_FL_KEEP_SIZE).
3435 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3436 struct btrfs_file_extent_item);
3438 * If it's an inline extent, it can not have other extents
3441 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3442 BTRFS_FILE_EXTENT_INLINE)
3443 goto copy_inline_extent;
3445 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3446 if (ext_len > aligned_end)
3449 ret = btrfs_next_item(root, path);
3452 } else if (ret == 0) {
3453 btrfs_item_key_to_cpu(path->nodes[0], &key,
3455 if (key.objectid == btrfs_ino(dst) &&
3456 key.type == BTRFS_EXTENT_DATA_KEY)
3463 * We have no extent items, or we have an extent at offset 0 which may
3464 * or may not be inlined. All these cases are dealt the same way.
3466 if (i_size_read(dst) > datal) {
3468 * If the destination inode has an inline extent...
3469 * This would require copying the data from the source inline
3470 * extent into the beginning of the destination's inline extent.
3471 * But this is really complex, both extents can be compressed
3472 * or just one of them, which would require decompressing and
3473 * re-compressing data (which could increase the new compressed
3474 * size, not allowing the compressed data to fit anymore in an
3476 * So just don't support this case for now (it should be rare,
3477 * we are not really saving space when cloning inline extents).
3482 btrfs_release_path(path);
3483 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3486 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3491 const u32 start = btrfs_file_extent_calc_inline_size(0);
3493 memmove(inline_data + start, inline_data + start + skip, datal);
3496 write_extent_buffer(path->nodes[0], inline_data,
3497 btrfs_item_ptr_offset(path->nodes[0],
3500 inode_add_bytes(dst, datal);
3506 * btrfs_clone() - clone a range from inode file to another
3508 * @src: Inode to clone from
3509 * @inode: Inode to clone to
3510 * @off: Offset within source to start clone from
3511 * @olen: Original length, passed by user, of range to clone
3512 * @olen_aligned: Block-aligned value of olen
3513 * @destoff: Offset within @inode to start clone
3514 * @no_time_update: Whether to update mtime/ctime on the target inode
3516 static int btrfs_clone(struct inode *src, struct inode *inode,
3517 const u64 off, const u64 olen, const u64 olen_aligned,
3518 const u64 destoff, int no_time_update)
3520 struct btrfs_root *root = BTRFS_I(inode)->root;
3521 struct btrfs_path *path = NULL;
3522 struct extent_buffer *leaf;
3523 struct btrfs_trans_handle *trans;
3525 struct btrfs_key key;
3529 const u64 len = olen_aligned;
3530 u64 last_dest_end = destoff;
3533 buf = kmalloc(root->nodesize, GFP_KERNEL | __GFP_NOWARN);
3535 buf = vmalloc(root->nodesize);
3540 path = btrfs_alloc_path();
3546 path->reada = READA_FORWARD;
3548 key.objectid = btrfs_ino(src);
3549 key.type = BTRFS_EXTENT_DATA_KEY;
3553 u64 next_key_min_offset = key.offset + 1;
3556 * note the key will change type as we walk through the
3559 path->leave_spinning = 1;
3560 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3565 * First search, if no extent item that starts at offset off was
3566 * found but the previous item is an extent item, it's possible
3567 * it might overlap our target range, therefore process it.
3569 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3570 btrfs_item_key_to_cpu(path->nodes[0], &key,
3571 path->slots[0] - 1);
3572 if (key.type == BTRFS_EXTENT_DATA_KEY)
3576 nritems = btrfs_header_nritems(path->nodes[0]);
3578 if (path->slots[0] >= nritems) {
3579 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3584 nritems = btrfs_header_nritems(path->nodes[0]);
3586 leaf = path->nodes[0];
3587 slot = path->slots[0];
3589 btrfs_item_key_to_cpu(leaf, &key, slot);
3590 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3591 key.objectid != btrfs_ino(src))
3594 if (key.type == BTRFS_EXTENT_DATA_KEY) {
3595 struct btrfs_file_extent_item *extent;
3598 struct btrfs_key new_key;
3599 u64 disko = 0, diskl = 0;
3600 u64 datao = 0, datal = 0;
3604 extent = btrfs_item_ptr(leaf, slot,
3605 struct btrfs_file_extent_item);
3606 comp = btrfs_file_extent_compression(leaf, extent);
3607 type = btrfs_file_extent_type(leaf, extent);
3608 if (type == BTRFS_FILE_EXTENT_REG ||
3609 type == BTRFS_FILE_EXTENT_PREALLOC) {
3610 disko = btrfs_file_extent_disk_bytenr(leaf,
3612 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3614 datao = btrfs_file_extent_offset(leaf, extent);
3615 datal = btrfs_file_extent_num_bytes(leaf,
3617 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3618 /* take upper bound, may be compressed */
3619 datal = btrfs_file_extent_ram_bytes(leaf,
3624 * The first search might have left us at an extent
3625 * item that ends before our target range's start, can
3626 * happen if we have holes and NO_HOLES feature enabled.
3628 if (key.offset + datal <= off) {
3631 } else if (key.offset >= off + len) {
3634 next_key_min_offset = key.offset + datal;
3635 size = btrfs_item_size_nr(leaf, slot);
3636 read_extent_buffer(leaf, buf,
3637 btrfs_item_ptr_offset(leaf, slot),
3640 btrfs_release_path(path);
3641 path->leave_spinning = 0;
3643 memcpy(&new_key, &key, sizeof(new_key));
3644 new_key.objectid = btrfs_ino(inode);
3645 if (off <= key.offset)
3646 new_key.offset = key.offset + destoff - off;
3648 new_key.offset = destoff;
3651 * Deal with a hole that doesn't have an extent item
3652 * that represents it (NO_HOLES feature enabled).
3653 * This hole is either in the middle of the cloning
3654 * range or at the beginning (fully overlaps it or
3655 * partially overlaps it).
3657 if (new_key.offset != last_dest_end)
3658 drop_start = last_dest_end;
3660 drop_start = new_key.offset;
3663 * 1 - adjusting old extent (we may have to split it)
3664 * 1 - add new extent
3667 trans = btrfs_start_transaction(root, 3);
3668 if (IS_ERR(trans)) {
3669 ret = PTR_ERR(trans);
3673 if (type == BTRFS_FILE_EXTENT_REG ||
3674 type == BTRFS_FILE_EXTENT_PREALLOC) {
3676 * a | --- range to clone ---| b
3677 * | ------------- extent ------------- |
3680 /* subtract range b */
3681 if (key.offset + datal > off + len)
3682 datal = off + len - key.offset;
3684 /* subtract range a */
3685 if (off > key.offset) {
3686 datao += off - key.offset;
3687 datal -= off - key.offset;
3690 ret = btrfs_drop_extents(trans, root, inode,
3692 new_key.offset + datal,
3695 if (ret != -EOPNOTSUPP)
3696 btrfs_abort_transaction(trans,
3698 btrfs_end_transaction(trans, root);
3702 ret = btrfs_insert_empty_item(trans, root, path,
3705 btrfs_abort_transaction(trans, root,
3707 btrfs_end_transaction(trans, root);
3711 leaf = path->nodes[0];
3712 slot = path->slots[0];
3713 write_extent_buffer(leaf, buf,
3714 btrfs_item_ptr_offset(leaf, slot),
3717 extent = btrfs_item_ptr(leaf, slot,
3718 struct btrfs_file_extent_item);
3720 /* disko == 0 means it's a hole */
3724 btrfs_set_file_extent_offset(leaf, extent,
3726 btrfs_set_file_extent_num_bytes(leaf, extent,
3730 inode_add_bytes(inode, datal);
3731 ret = btrfs_inc_extent_ref(trans, root,
3733 root->root_key.objectid,
3735 new_key.offset - datao);
3737 btrfs_abort_transaction(trans,
3740 btrfs_end_transaction(trans,
3746 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3750 if (off > key.offset) {
3751 skip = off - key.offset;
3752 new_key.offset += skip;
3755 if (key.offset + datal > off + len)
3756 trim = key.offset + datal - (off + len);
3758 if (comp && (skip || trim)) {
3760 btrfs_end_transaction(trans, root);
3763 size -= skip + trim;
3764 datal -= skip + trim;
3766 ret = clone_copy_inline_extent(src, inode,
3773 if (ret != -EOPNOTSUPP)
3774 btrfs_abort_transaction(trans,
3777 btrfs_end_transaction(trans, root);
3780 leaf = path->nodes[0];
3781 slot = path->slots[0];
3784 /* If we have an implicit hole (NO_HOLES feature). */
3785 if (drop_start < new_key.offset)
3786 clone_update_extent_map(inode, trans,
3788 new_key.offset - drop_start);
3790 clone_update_extent_map(inode, trans, path, 0, 0);
3792 btrfs_mark_buffer_dirty(leaf);
3793 btrfs_release_path(path);
3795 last_dest_end = ALIGN(new_key.offset + datal,
3797 ret = clone_finish_inode_update(trans, inode,
3803 if (new_key.offset + datal >= destoff + len)
3806 btrfs_release_path(path);
3807 key.offset = next_key_min_offset;
3811 if (last_dest_end < destoff + len) {
3813 * We have an implicit hole (NO_HOLES feature is enabled) that
3814 * fully or partially overlaps our cloning range at its end.
3816 btrfs_release_path(path);
3819 * 1 - remove extent(s)
3822 trans = btrfs_start_transaction(root, 2);
3823 if (IS_ERR(trans)) {
3824 ret = PTR_ERR(trans);
3827 ret = btrfs_drop_extents(trans, root, inode,
3828 last_dest_end, destoff + len, 1);
3830 if (ret != -EOPNOTSUPP)
3831 btrfs_abort_transaction(trans, root, ret);
3832 btrfs_end_transaction(trans, root);
3835 clone_update_extent_map(inode, trans, NULL, last_dest_end,
3836 destoff + len - last_dest_end);
3837 ret = clone_finish_inode_update(trans, inode, destoff + len,
3838 destoff, olen, no_time_update);
3842 btrfs_free_path(path);
3847 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3848 u64 off, u64 olen, u64 destoff)
3850 struct inode *inode = file_inode(file);
3851 struct inode *src = file_inode(file_src);
3852 struct btrfs_root *root = BTRFS_I(inode)->root;
3855 u64 bs = root->fs_info->sb->s_blocksize;
3856 int same_inode = src == inode;
3860 * - split compressed inline extents. annoying: we need to
3861 * decompress into destination's address_space (the file offset
3862 * may change, so source mapping won't do), then recompress (or
3863 * otherwise reinsert) a subrange.
3865 * - split destination inode's inline extents. The inline extents can
3866 * be either compressed or non-compressed.
3869 if (btrfs_root_readonly(root))
3872 if (file_src->f_path.mnt != file->f_path.mnt ||
3873 src->i_sb != inode->i_sb)
3876 /* don't make the dst file partly checksummed */
3877 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3878 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3881 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3885 btrfs_double_inode_lock(src, inode);
3890 /* determine range to clone */
3892 if (off + len > src->i_size || off + len < off)
3895 olen = len = src->i_size - off;
3896 /* if we extend to eof, continue to block boundary */
3897 if (off + len == src->i_size)
3898 len = ALIGN(src->i_size, bs) - off;
3905 /* verify the end result is block aligned */
3906 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3907 !IS_ALIGNED(destoff, bs))
3910 /* verify if ranges are overlapped within the same file */
3912 if (destoff + len > off && destoff < off + len)
3916 if (destoff > inode->i_size) {
3917 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3923 * Lock the target range too. Right after we replace the file extent
3924 * items in the fs tree (which now point to the cloned data), we might
3925 * have a worker replace them with extent items relative to a write
3926 * operation that was issued before this clone operation (i.e. confront
3927 * with inode.c:btrfs_finish_ordered_io).
3930 u64 lock_start = min_t(u64, off, destoff);
3931 u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
3933 ret = lock_extent_range(src, lock_start, lock_len, true);
3935 ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
3940 /* ranges in the io trees already unlocked */
3944 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3947 u64 lock_start = min_t(u64, off, destoff);
3948 u64 lock_end = max_t(u64, off, destoff) + len - 1;
3950 unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
3952 btrfs_double_extent_unlock(src, off, inode, destoff, len);
3955 * Truncate page cache pages so that future reads will see the cloned
3956 * data immediately and not the previous data.
3958 truncate_inode_pages_range(&inode->i_data,
3959 round_down(destoff, PAGE_SIZE),
3960 round_up(destoff + len, PAGE_SIZE) - 1);
3963 btrfs_double_inode_unlock(src, inode);
3969 ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
3970 struct file *file_out, loff_t pos_out,
3971 size_t len, unsigned int flags)
3975 ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out);
3981 int btrfs_clone_file_range(struct file *src_file, loff_t off,
3982 struct file *dst_file, loff_t destoff, u64 len)
3984 return btrfs_clone_files(dst_file, src_file, off, len, destoff);
3988 * there are many ways the trans_start and trans_end ioctls can lead
3989 * to deadlocks. They should only be used by applications that
3990 * basically own the machine, and have a very in depth understanding
3991 * of all the possible deadlocks and enospc problems.
3993 static long btrfs_ioctl_trans_start(struct file *file)
3995 struct inode *inode = file_inode(file);
3996 struct btrfs_root *root = BTRFS_I(inode)->root;
3997 struct btrfs_trans_handle *trans;
4001 if (!capable(CAP_SYS_ADMIN))
4005 if (file->private_data)
4009 if (btrfs_root_readonly(root))
4012 ret = mnt_want_write_file(file);
4016 atomic_inc(&root->fs_info->open_ioctl_trans);
4019 trans = btrfs_start_ioctl_transaction(root);
4023 file->private_data = trans;
4027 atomic_dec(&root->fs_info->open_ioctl_trans);
4028 mnt_drop_write_file(file);
4033 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
4035 struct inode *inode = file_inode(file);
4036 struct btrfs_root *root = BTRFS_I(inode)->root;
4037 struct btrfs_root *new_root;
4038 struct btrfs_dir_item *di;
4039 struct btrfs_trans_handle *trans;
4040 struct btrfs_path *path;
4041 struct btrfs_key location;
4042 struct btrfs_disk_key disk_key;
4047 if (!capable(CAP_SYS_ADMIN))
4050 ret = mnt_want_write_file(file);
4054 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
4060 objectid = BTRFS_FS_TREE_OBJECTID;
4062 location.objectid = objectid;
4063 location.type = BTRFS_ROOT_ITEM_KEY;
4064 location.offset = (u64)-1;
4066 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
4067 if (IS_ERR(new_root)) {
4068 ret = PTR_ERR(new_root);
4072 path = btrfs_alloc_path();
4077 path->leave_spinning = 1;
4079 trans = btrfs_start_transaction(root, 1);
4080 if (IS_ERR(trans)) {
4081 btrfs_free_path(path);
4082 ret = PTR_ERR(trans);
4086 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
4087 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
4088 dir_id, "default", 7, 1);
4089 if (IS_ERR_OR_NULL(di)) {
4090 btrfs_free_path(path);
4091 btrfs_end_transaction(trans, root);
4092 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
4093 "item, this isn't going to work");
4098 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4099 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4100 btrfs_mark_buffer_dirty(path->nodes[0]);
4101 btrfs_free_path(path);
4103 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
4104 btrfs_end_transaction(trans, root);
4106 mnt_drop_write_file(file);
4110 void btrfs_get_block_group_info(struct list_head *groups_list,
4111 struct btrfs_ioctl_space_info *space)
4113 struct btrfs_block_group_cache *block_group;
4115 space->total_bytes = 0;
4116 space->used_bytes = 0;
4118 list_for_each_entry(block_group, groups_list, list) {
4119 space->flags = block_group->flags;
4120 space->total_bytes += block_group->key.offset;
4121 space->used_bytes +=
4122 btrfs_block_group_used(&block_group->item);
4126 static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
4128 struct btrfs_ioctl_space_args space_args;
4129 struct btrfs_ioctl_space_info space;
4130 struct btrfs_ioctl_space_info *dest;
4131 struct btrfs_ioctl_space_info *dest_orig;
4132 struct btrfs_ioctl_space_info __user *user_dest;
4133 struct btrfs_space_info *info;
4134 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
4135 BTRFS_BLOCK_GROUP_SYSTEM,
4136 BTRFS_BLOCK_GROUP_METADATA,
4137 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
4144 if (copy_from_user(&space_args,
4145 (struct btrfs_ioctl_space_args __user *)arg,
4146 sizeof(space_args)))
4149 for (i = 0; i < num_types; i++) {
4150 struct btrfs_space_info *tmp;
4154 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
4156 if (tmp->flags == types[i]) {
4166 down_read(&info->groups_sem);
4167 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4168 if (!list_empty(&info->block_groups[c]))
4171 up_read(&info->groups_sem);
4175 * Global block reserve, exported as a space_info
4179 /* space_slots == 0 means they are asking for a count */
4180 if (space_args.space_slots == 0) {
4181 space_args.total_spaces = slot_count;
4185 slot_count = min_t(u64, space_args.space_slots, slot_count);
4187 alloc_size = sizeof(*dest) * slot_count;
4189 /* we generally have at most 6 or so space infos, one for each raid
4190 * level. So, a whole page should be more than enough for everyone
4192 if (alloc_size > PAGE_SIZE)
4195 space_args.total_spaces = 0;
4196 dest = kmalloc(alloc_size, GFP_KERNEL);
4201 /* now we have a buffer to copy into */
4202 for (i = 0; i < num_types; i++) {
4203 struct btrfs_space_info *tmp;
4210 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
4212 if (tmp->flags == types[i]) {
4221 down_read(&info->groups_sem);
4222 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4223 if (!list_empty(&info->block_groups[c])) {
4224 btrfs_get_block_group_info(
4225 &info->block_groups[c], &space);
4226 memcpy(dest, &space, sizeof(space));
4228 space_args.total_spaces++;
4234 up_read(&info->groups_sem);
4238 * Add global block reserve
4241 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
4243 spin_lock(&block_rsv->lock);
4244 space.total_bytes = block_rsv->size;
4245 space.used_bytes = block_rsv->size - block_rsv->reserved;
4246 spin_unlock(&block_rsv->lock);
4247 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4248 memcpy(dest, &space, sizeof(space));
4249 space_args.total_spaces++;
4252 user_dest = (struct btrfs_ioctl_space_info __user *)
4253 (arg + sizeof(struct btrfs_ioctl_space_args));
4255 if (copy_to_user(user_dest, dest_orig, alloc_size))
4260 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4267 * there are many ways the trans_start and trans_end ioctls can lead
4268 * to deadlocks. They should only be used by applications that
4269 * basically own the machine, and have a very in depth understanding
4270 * of all the possible deadlocks and enospc problems.
4272 long btrfs_ioctl_trans_end(struct file *file)
4274 struct inode *inode = file_inode(file);
4275 struct btrfs_root *root = BTRFS_I(inode)->root;
4276 struct btrfs_trans_handle *trans;
4278 trans = file->private_data;
4281 file->private_data = NULL;
4283 btrfs_end_transaction(trans, root);
4285 atomic_dec(&root->fs_info->open_ioctl_trans);
4287 mnt_drop_write_file(file);
4291 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4294 struct btrfs_trans_handle *trans;
4298 trans = btrfs_attach_transaction_barrier(root);
4299 if (IS_ERR(trans)) {
4300 if (PTR_ERR(trans) != -ENOENT)
4301 return PTR_ERR(trans);
4303 /* No running transaction, don't bother */
4304 transid = root->fs_info->last_trans_committed;
4307 transid = trans->transid;
4308 ret = btrfs_commit_transaction_async(trans, root, 0);
4310 btrfs_end_transaction(trans, root);
4315 if (copy_to_user(argp, &transid, sizeof(transid)))
4320 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
4326 if (copy_from_user(&transid, argp, sizeof(transid)))
4329 transid = 0; /* current trans */
4331 return btrfs_wait_for_commit(root, transid);
4334 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4336 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4337 struct btrfs_ioctl_scrub_args *sa;
4340 if (!capable(CAP_SYS_ADMIN))
4343 sa = memdup_user(arg, sizeof(*sa));
4347 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4348 ret = mnt_want_write_file(file);
4353 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
4354 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4357 if (copy_to_user(arg, sa, sizeof(*sa)))
4360 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4361 mnt_drop_write_file(file);
4367 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
4369 if (!capable(CAP_SYS_ADMIN))
4372 return btrfs_scrub_cancel(root->fs_info);
4375 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
4378 struct btrfs_ioctl_scrub_args *sa;
4381 if (!capable(CAP_SYS_ADMIN))
4384 sa = memdup_user(arg, sizeof(*sa));
4388 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
4390 if (copy_to_user(arg, sa, sizeof(*sa)))
4397 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
4400 struct btrfs_ioctl_get_dev_stats *sa;
4403 sa = memdup_user(arg, sizeof(*sa));
4407 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4412 ret = btrfs_get_dev_stats(root, sa);
4414 if (copy_to_user(arg, sa, sizeof(*sa)))
4421 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
4423 struct btrfs_ioctl_dev_replace_args *p;
4426 if (!capable(CAP_SYS_ADMIN))
4429 p = memdup_user(arg, sizeof(*p));
4434 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4435 if (root->fs_info->sb->s_flags & MS_RDONLY) {
4440 &root->fs_info->mutually_exclusive_operation_running,
4442 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4444 ret = btrfs_dev_replace_by_ioctl(root, p);
4446 &root->fs_info->mutually_exclusive_operation_running,
4450 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4451 btrfs_dev_replace_status(root->fs_info, p);
4454 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4455 ret = btrfs_dev_replace_cancel(root->fs_info, p);
4462 if (copy_to_user(arg, p, sizeof(*p)))
4469 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4475 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4476 struct inode_fs_paths *ipath = NULL;
4477 struct btrfs_path *path;
4479 if (!capable(CAP_DAC_READ_SEARCH))
4482 path = btrfs_alloc_path();
4488 ipa = memdup_user(arg, sizeof(*ipa));
4495 size = min_t(u32, ipa->size, 4096);
4496 ipath = init_ipath(size, root, path);
4497 if (IS_ERR(ipath)) {
4498 ret = PTR_ERR(ipath);
4503 ret = paths_from_inode(ipa->inum, ipath);
4507 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4508 rel_ptr = ipath->fspath->val[i] -
4509 (u64)(unsigned long)ipath->fspath->val;
4510 ipath->fspath->val[i] = rel_ptr;
4513 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
4514 (void *)(unsigned long)ipath->fspath, size);
4521 btrfs_free_path(path);
4528 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4530 struct btrfs_data_container *inodes = ctx;
4531 const size_t c = 3 * sizeof(u64);
4533 if (inodes->bytes_left >= c) {
4534 inodes->bytes_left -= c;
4535 inodes->val[inodes->elem_cnt] = inum;
4536 inodes->val[inodes->elem_cnt + 1] = offset;
4537 inodes->val[inodes->elem_cnt + 2] = root;
4538 inodes->elem_cnt += 3;
4540 inodes->bytes_missing += c - inodes->bytes_left;
4541 inodes->bytes_left = 0;
4542 inodes->elem_missed += 3;
4548 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
4553 struct btrfs_ioctl_logical_ino_args *loi;
4554 struct btrfs_data_container *inodes = NULL;
4555 struct btrfs_path *path = NULL;
4557 if (!capable(CAP_SYS_ADMIN))
4560 loi = memdup_user(arg, sizeof(*loi));
4567 path = btrfs_alloc_path();
4573 size = min_t(u32, loi->size, SZ_64K);
4574 inodes = init_data_container(size);
4575 if (IS_ERR(inodes)) {
4576 ret = PTR_ERR(inodes);
4581 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
4582 build_ino_list, inodes);
4588 ret = copy_to_user((void *)(unsigned long)loi->inodes,
4589 (void *)(unsigned long)inodes, size);
4594 btrfs_free_path(path);
4601 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
4602 struct btrfs_ioctl_balance_args *bargs)
4604 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4606 bargs->flags = bctl->flags;
4608 if (atomic_read(&fs_info->balance_running))
4609 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4610 if (atomic_read(&fs_info->balance_pause_req))
4611 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4612 if (atomic_read(&fs_info->balance_cancel_req))
4613 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4615 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4616 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4617 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4620 spin_lock(&fs_info->balance_lock);
4621 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4622 spin_unlock(&fs_info->balance_lock);
4624 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4628 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4630 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4631 struct btrfs_fs_info *fs_info = root->fs_info;
4632 struct btrfs_ioctl_balance_args *bargs;
4633 struct btrfs_balance_control *bctl;
4634 bool need_unlock; /* for mut. excl. ops lock */
4637 if (!capable(CAP_SYS_ADMIN))
4640 ret = mnt_want_write_file(file);
4645 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4646 mutex_lock(&fs_info->volume_mutex);
4647 mutex_lock(&fs_info->balance_mutex);
4653 * mut. excl. ops lock is locked. Three possibilities:
4654 * (1) some other op is running
4655 * (2) balance is running
4656 * (3) balance is paused -- special case (think resume)
4658 mutex_lock(&fs_info->balance_mutex);
4659 if (fs_info->balance_ctl) {
4660 /* this is either (2) or (3) */
4661 if (!atomic_read(&fs_info->balance_running)) {
4662 mutex_unlock(&fs_info->balance_mutex);
4663 if (!mutex_trylock(&fs_info->volume_mutex))
4665 mutex_lock(&fs_info->balance_mutex);
4667 if (fs_info->balance_ctl &&
4668 !atomic_read(&fs_info->balance_running)) {
4670 need_unlock = false;
4674 mutex_unlock(&fs_info->balance_mutex);
4675 mutex_unlock(&fs_info->volume_mutex);
4679 mutex_unlock(&fs_info->balance_mutex);
4685 mutex_unlock(&fs_info->balance_mutex);
4686 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4691 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4694 bargs = memdup_user(arg, sizeof(*bargs));
4695 if (IS_ERR(bargs)) {
4696 ret = PTR_ERR(bargs);
4700 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4701 if (!fs_info->balance_ctl) {
4706 bctl = fs_info->balance_ctl;
4707 spin_lock(&fs_info->balance_lock);
4708 bctl->flags |= BTRFS_BALANCE_RESUME;
4709 spin_unlock(&fs_info->balance_lock);
4717 if (fs_info->balance_ctl) {
4722 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4728 bctl->fs_info = fs_info;
4730 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4731 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4732 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4734 bctl->flags = bargs->flags;
4736 /* balance everything - no filters */
4737 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4740 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4747 * Ownership of bctl and mutually_exclusive_operation_running
4748 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4749 * or, if restriper was paused all the way until unmount, in
4750 * free_fs_info. mutually_exclusive_operation_running is
4751 * cleared in __cancel_balance.
4753 need_unlock = false;
4755 ret = btrfs_balance(bctl, bargs);
4759 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4768 mutex_unlock(&fs_info->balance_mutex);
4769 mutex_unlock(&fs_info->volume_mutex);
4771 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4773 mnt_drop_write_file(file);
4777 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4779 if (!capable(CAP_SYS_ADMIN))
4783 case BTRFS_BALANCE_CTL_PAUSE:
4784 return btrfs_pause_balance(root->fs_info);
4785 case BTRFS_BALANCE_CTL_CANCEL:
4786 return btrfs_cancel_balance(root->fs_info);
4792 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4795 struct btrfs_fs_info *fs_info = root->fs_info;
4796 struct btrfs_ioctl_balance_args *bargs;
4799 if (!capable(CAP_SYS_ADMIN))
4802 mutex_lock(&fs_info->balance_mutex);
4803 if (!fs_info->balance_ctl) {
4808 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4814 update_ioctl_balance_args(fs_info, 1, bargs);
4816 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4821 mutex_unlock(&fs_info->balance_mutex);
4825 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4827 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4828 struct btrfs_ioctl_quota_ctl_args *sa;
4829 struct btrfs_trans_handle *trans = NULL;
4833 if (!capable(CAP_SYS_ADMIN))
4836 ret = mnt_want_write_file(file);
4840 sa = memdup_user(arg, sizeof(*sa));
4846 down_write(&root->fs_info->subvol_sem);
4847 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4848 if (IS_ERR(trans)) {
4849 ret = PTR_ERR(trans);
4854 case BTRFS_QUOTA_CTL_ENABLE:
4855 ret = btrfs_quota_enable(trans, root->fs_info);
4857 case BTRFS_QUOTA_CTL_DISABLE:
4858 ret = btrfs_quota_disable(trans, root->fs_info);
4865 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4870 up_write(&root->fs_info->subvol_sem);
4872 mnt_drop_write_file(file);
4876 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4878 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4879 struct btrfs_ioctl_qgroup_assign_args *sa;
4880 struct btrfs_trans_handle *trans;
4884 if (!capable(CAP_SYS_ADMIN))
4887 ret = mnt_want_write_file(file);
4891 sa = memdup_user(arg, sizeof(*sa));
4897 trans = btrfs_join_transaction(root);
4898 if (IS_ERR(trans)) {
4899 ret = PTR_ERR(trans);
4903 /* FIXME: check if the IDs really exist */
4905 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4908 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4912 /* update qgroup status and info */
4913 err = btrfs_run_qgroups(trans, root->fs_info);
4915 btrfs_handle_fs_error(root->fs_info, err,
4916 "failed to update qgroup status and info");
4917 err = btrfs_end_transaction(trans, root);
4924 mnt_drop_write_file(file);
4928 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4930 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4931 struct btrfs_ioctl_qgroup_create_args *sa;
4932 struct btrfs_trans_handle *trans;
4936 if (!capable(CAP_SYS_ADMIN))
4939 ret = mnt_want_write_file(file);
4943 sa = memdup_user(arg, sizeof(*sa));
4949 if (!sa->qgroupid) {
4954 trans = btrfs_join_transaction(root);
4955 if (IS_ERR(trans)) {
4956 ret = PTR_ERR(trans);
4960 /* FIXME: check if the IDs really exist */
4962 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid);
4964 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4967 err = btrfs_end_transaction(trans, root);
4974 mnt_drop_write_file(file);
4978 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4980 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4981 struct btrfs_ioctl_qgroup_limit_args *sa;
4982 struct btrfs_trans_handle *trans;
4987 if (!capable(CAP_SYS_ADMIN))
4990 ret = mnt_want_write_file(file);
4994 sa = memdup_user(arg, sizeof(*sa));
5000 trans = btrfs_join_transaction(root);
5001 if (IS_ERR(trans)) {
5002 ret = PTR_ERR(trans);
5006 qgroupid = sa->qgroupid;
5008 /* take the current subvol as qgroup */
5009 qgroupid = root->root_key.objectid;
5012 /* FIXME: check if the IDs really exist */
5013 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
5015 err = btrfs_end_transaction(trans, root);
5022 mnt_drop_write_file(file);
5026 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
5028 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5029 struct btrfs_ioctl_quota_rescan_args *qsa;
5032 if (!capable(CAP_SYS_ADMIN))
5035 ret = mnt_want_write_file(file);
5039 qsa = memdup_user(arg, sizeof(*qsa));
5050 ret = btrfs_qgroup_rescan(root->fs_info);
5055 mnt_drop_write_file(file);
5059 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
5061 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5062 struct btrfs_ioctl_quota_rescan_args *qsa;
5065 if (!capable(CAP_SYS_ADMIN))
5068 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
5072 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
5074 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
5077 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5084 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5086 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5088 if (!capable(CAP_SYS_ADMIN))
5091 return btrfs_qgroup_wait_for_completion(root->fs_info);
5094 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5095 struct btrfs_ioctl_received_subvol_args *sa)
5097 struct inode *inode = file_inode(file);
5098 struct btrfs_root *root = BTRFS_I(inode)->root;
5099 struct btrfs_root_item *root_item = &root->root_item;
5100 struct btrfs_trans_handle *trans;
5101 struct timespec ct = current_fs_time(inode->i_sb);
5103 int received_uuid_changed;
5105 if (!inode_owner_or_capable(inode))
5108 ret = mnt_want_write_file(file);
5112 down_write(&root->fs_info->subvol_sem);
5114 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
5119 if (btrfs_root_readonly(root)) {
5126 * 2 - uuid items (received uuid + subvol uuid)
5128 trans = btrfs_start_transaction(root, 3);
5129 if (IS_ERR(trans)) {
5130 ret = PTR_ERR(trans);
5135 sa->rtransid = trans->transid;
5136 sa->rtime.sec = ct.tv_sec;
5137 sa->rtime.nsec = ct.tv_nsec;
5139 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5141 if (received_uuid_changed &&
5142 !btrfs_is_empty_uuid(root_item->received_uuid))
5143 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
5144 root_item->received_uuid,
5145 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5146 root->root_key.objectid);
5147 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5148 btrfs_set_root_stransid(root_item, sa->stransid);
5149 btrfs_set_root_rtransid(root_item, sa->rtransid);
5150 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5151 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5152 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5153 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5155 ret = btrfs_update_root(trans, root->fs_info->tree_root,
5156 &root->root_key, &root->root_item);
5158 btrfs_end_transaction(trans, root);
5161 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5162 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
5164 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5165 root->root_key.objectid);
5166 if (ret < 0 && ret != -EEXIST) {
5167 btrfs_abort_transaction(trans, root, ret);
5171 ret = btrfs_commit_transaction(trans, root);
5173 btrfs_abort_transaction(trans, root, ret);
5178 up_write(&root->fs_info->subvol_sem);
5179 mnt_drop_write_file(file);
5184 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5187 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5188 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5191 args32 = memdup_user(arg, sizeof(*args32));
5192 if (IS_ERR(args32)) {
5193 ret = PTR_ERR(args32);
5198 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5204 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5205 args64->stransid = args32->stransid;
5206 args64->rtransid = args32->rtransid;
5207 args64->stime.sec = args32->stime.sec;
5208 args64->stime.nsec = args32->stime.nsec;
5209 args64->rtime.sec = args32->rtime.sec;
5210 args64->rtime.nsec = args32->rtime.nsec;
5211 args64->flags = args32->flags;
5213 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5217 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5218 args32->stransid = args64->stransid;
5219 args32->rtransid = args64->rtransid;
5220 args32->stime.sec = args64->stime.sec;
5221 args32->stime.nsec = args64->stime.nsec;
5222 args32->rtime.sec = args64->rtime.sec;
5223 args32->rtime.nsec = args64->rtime.nsec;
5224 args32->flags = args64->flags;
5226 ret = copy_to_user(arg, args32, sizeof(*args32));
5237 static long btrfs_ioctl_set_received_subvol(struct file *file,
5240 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5243 sa = memdup_user(arg, sizeof(*sa));
5250 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5255 ret = copy_to_user(arg, sa, sizeof(*sa));
5264 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5266 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5269 char label[BTRFS_LABEL_SIZE];
5271 spin_lock(&root->fs_info->super_lock);
5272 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5273 spin_unlock(&root->fs_info->super_lock);
5275 len = strnlen(label, BTRFS_LABEL_SIZE);
5277 if (len == BTRFS_LABEL_SIZE) {
5278 btrfs_warn(root->fs_info,
5279 "label is too long, return the first %zu bytes", --len);
5282 ret = copy_to_user(arg, label, len);
5284 return ret ? -EFAULT : 0;
5287 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5289 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5290 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5291 struct btrfs_trans_handle *trans;
5292 char label[BTRFS_LABEL_SIZE];
5295 if (!capable(CAP_SYS_ADMIN))
5298 if (copy_from_user(label, arg, sizeof(label)))
5301 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5302 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
5303 BTRFS_LABEL_SIZE - 1);
5307 ret = mnt_want_write_file(file);
5311 trans = btrfs_start_transaction(root, 0);
5312 if (IS_ERR(trans)) {
5313 ret = PTR_ERR(trans);
5317 spin_lock(&root->fs_info->super_lock);
5318 strcpy(super_block->label, label);
5319 spin_unlock(&root->fs_info->super_lock);
5320 ret = btrfs_commit_transaction(trans, root);
5323 mnt_drop_write_file(file);
5327 #define INIT_FEATURE_FLAGS(suffix) \
5328 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5329 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5330 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5332 int btrfs_ioctl_get_supported_features(void __user *arg)
5334 static const struct btrfs_ioctl_feature_flags features[3] = {
5335 INIT_FEATURE_FLAGS(SUPP),
5336 INIT_FEATURE_FLAGS(SAFE_SET),
5337 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5340 if (copy_to_user(arg, &features, sizeof(features)))
5346 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5348 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5349 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5350 struct btrfs_ioctl_feature_flags features;
5352 features.compat_flags = btrfs_super_compat_flags(super_block);
5353 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5354 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5356 if (copy_to_user(arg, &features, sizeof(features)))
5362 static int check_feature_bits(struct btrfs_root *root,
5363 enum btrfs_feature_set set,
5364 u64 change_mask, u64 flags, u64 supported_flags,
5365 u64 safe_set, u64 safe_clear)
5367 const char *type = btrfs_feature_set_names[set];
5369 u64 disallowed, unsupported;
5370 u64 set_mask = flags & change_mask;
5371 u64 clear_mask = ~flags & change_mask;
5373 unsupported = set_mask & ~supported_flags;
5375 names = btrfs_printable_features(set, unsupported);
5377 btrfs_warn(root->fs_info,
5378 "this kernel does not support the %s feature bit%s",
5379 names, strchr(names, ',') ? "s" : "");
5382 btrfs_warn(root->fs_info,
5383 "this kernel does not support %s bits 0x%llx",
5388 disallowed = set_mask & ~safe_set;
5390 names = btrfs_printable_features(set, disallowed);
5392 btrfs_warn(root->fs_info,
5393 "can't set the %s feature bit%s while mounted",
5394 names, strchr(names, ',') ? "s" : "");
5397 btrfs_warn(root->fs_info,
5398 "can't set %s bits 0x%llx while mounted",
5403 disallowed = clear_mask & ~safe_clear;
5405 names = btrfs_printable_features(set, disallowed);
5407 btrfs_warn(root->fs_info,
5408 "can't clear the %s feature bit%s while mounted",
5409 names, strchr(names, ',') ? "s" : "");
5412 btrfs_warn(root->fs_info,
5413 "can't clear %s bits 0x%llx while mounted",
5421 #define check_feature(root, change_mask, flags, mask_base) \
5422 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5423 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5424 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5425 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5427 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5429 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5430 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5431 struct btrfs_ioctl_feature_flags flags[2];
5432 struct btrfs_trans_handle *trans;
5436 if (!capable(CAP_SYS_ADMIN))
5439 if (copy_from_user(flags, arg, sizeof(flags)))
5443 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5444 !flags[0].incompat_flags)
5447 ret = check_feature(root, flags[0].compat_flags,
5448 flags[1].compat_flags, COMPAT);
5452 ret = check_feature(root, flags[0].compat_ro_flags,
5453 flags[1].compat_ro_flags, COMPAT_RO);
5457 ret = check_feature(root, flags[0].incompat_flags,
5458 flags[1].incompat_flags, INCOMPAT);
5462 ret = mnt_want_write_file(file);
5466 trans = btrfs_start_transaction(root, 0);
5467 if (IS_ERR(trans)) {
5468 ret = PTR_ERR(trans);
5469 goto out_drop_write;
5472 spin_lock(&root->fs_info->super_lock);
5473 newflags = btrfs_super_compat_flags(super_block);
5474 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5475 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5476 btrfs_set_super_compat_flags(super_block, newflags);
5478 newflags = btrfs_super_compat_ro_flags(super_block);
5479 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5480 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5481 btrfs_set_super_compat_ro_flags(super_block, newflags);
5483 newflags = btrfs_super_incompat_flags(super_block);
5484 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5485 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5486 btrfs_set_super_incompat_flags(super_block, newflags);
5487 spin_unlock(&root->fs_info->super_lock);
5489 ret = btrfs_commit_transaction(trans, root);
5491 mnt_drop_write_file(file);
5496 long btrfs_ioctl(struct file *file, unsigned int
5497 cmd, unsigned long arg)
5499 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5500 void __user *argp = (void __user *)arg;
5503 case FS_IOC_GETFLAGS:
5504 return btrfs_ioctl_getflags(file, argp);
5505 case FS_IOC_SETFLAGS:
5506 return btrfs_ioctl_setflags(file, argp);
5507 case FS_IOC_GETVERSION:
5508 return btrfs_ioctl_getversion(file, argp);
5510 return btrfs_ioctl_fitrim(file, argp);
5511 case BTRFS_IOC_SNAP_CREATE:
5512 return btrfs_ioctl_snap_create(file, argp, 0);
5513 case BTRFS_IOC_SNAP_CREATE_V2:
5514 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5515 case BTRFS_IOC_SUBVOL_CREATE:
5516 return btrfs_ioctl_snap_create(file, argp, 1);
5517 case BTRFS_IOC_SUBVOL_CREATE_V2:
5518 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5519 case BTRFS_IOC_SNAP_DESTROY:
5520 return btrfs_ioctl_snap_destroy(file, argp);
5521 case BTRFS_IOC_SUBVOL_GETFLAGS:
5522 return btrfs_ioctl_subvol_getflags(file, argp);
5523 case BTRFS_IOC_SUBVOL_SETFLAGS:
5524 return btrfs_ioctl_subvol_setflags(file, argp);
5525 case BTRFS_IOC_DEFAULT_SUBVOL:
5526 return btrfs_ioctl_default_subvol(file, argp);
5527 case BTRFS_IOC_DEFRAG:
5528 return btrfs_ioctl_defrag(file, NULL);
5529 case BTRFS_IOC_DEFRAG_RANGE:
5530 return btrfs_ioctl_defrag(file, argp);
5531 case BTRFS_IOC_RESIZE:
5532 return btrfs_ioctl_resize(file, argp);
5533 case BTRFS_IOC_ADD_DEV:
5534 return btrfs_ioctl_add_dev(root, argp);
5535 case BTRFS_IOC_RM_DEV:
5536 return btrfs_ioctl_rm_dev(file, argp);
5537 case BTRFS_IOC_RM_DEV_V2:
5538 return btrfs_ioctl_rm_dev_v2(file, argp);
5539 case BTRFS_IOC_FS_INFO:
5540 return btrfs_ioctl_fs_info(root, argp);
5541 case BTRFS_IOC_DEV_INFO:
5542 return btrfs_ioctl_dev_info(root, argp);
5543 case BTRFS_IOC_BALANCE:
5544 return btrfs_ioctl_balance(file, NULL);
5545 case BTRFS_IOC_TRANS_START:
5546 return btrfs_ioctl_trans_start(file);
5547 case BTRFS_IOC_TRANS_END:
5548 return btrfs_ioctl_trans_end(file);
5549 case BTRFS_IOC_TREE_SEARCH:
5550 return btrfs_ioctl_tree_search(file, argp);
5551 case BTRFS_IOC_TREE_SEARCH_V2:
5552 return btrfs_ioctl_tree_search_v2(file, argp);
5553 case BTRFS_IOC_INO_LOOKUP:
5554 return btrfs_ioctl_ino_lookup(file, argp);
5555 case BTRFS_IOC_INO_PATHS:
5556 return btrfs_ioctl_ino_to_path(root, argp);
5557 case BTRFS_IOC_LOGICAL_INO:
5558 return btrfs_ioctl_logical_to_ino(root, argp);
5559 case BTRFS_IOC_SPACE_INFO:
5560 return btrfs_ioctl_space_info(root, argp);
5561 case BTRFS_IOC_SYNC: {
5564 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
5567 ret = btrfs_sync_fs(file_inode(file)->i_sb, 1);
5569 * The transaction thread may want to do more work,
5570 * namely it pokes the cleaner kthread that will start
5571 * processing uncleaned subvols.
5573 wake_up_process(root->fs_info->transaction_kthread);
5576 case BTRFS_IOC_START_SYNC:
5577 return btrfs_ioctl_start_sync(root, argp);
5578 case BTRFS_IOC_WAIT_SYNC:
5579 return btrfs_ioctl_wait_sync(root, argp);
5580 case BTRFS_IOC_SCRUB:
5581 return btrfs_ioctl_scrub(file, argp);
5582 case BTRFS_IOC_SCRUB_CANCEL:
5583 return btrfs_ioctl_scrub_cancel(root, argp);
5584 case BTRFS_IOC_SCRUB_PROGRESS:
5585 return btrfs_ioctl_scrub_progress(root, argp);
5586 case BTRFS_IOC_BALANCE_V2:
5587 return btrfs_ioctl_balance(file, argp);
5588 case BTRFS_IOC_BALANCE_CTL:
5589 return btrfs_ioctl_balance_ctl(root, arg);
5590 case BTRFS_IOC_BALANCE_PROGRESS:
5591 return btrfs_ioctl_balance_progress(root, argp);
5592 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5593 return btrfs_ioctl_set_received_subvol(file, argp);
5595 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5596 return btrfs_ioctl_set_received_subvol_32(file, argp);
5598 case BTRFS_IOC_SEND:
5599 return btrfs_ioctl_send(file, argp);
5600 case BTRFS_IOC_GET_DEV_STATS:
5601 return btrfs_ioctl_get_dev_stats(root, argp);
5602 case BTRFS_IOC_QUOTA_CTL:
5603 return btrfs_ioctl_quota_ctl(file, argp);
5604 case BTRFS_IOC_QGROUP_ASSIGN:
5605 return btrfs_ioctl_qgroup_assign(file, argp);
5606 case BTRFS_IOC_QGROUP_CREATE:
5607 return btrfs_ioctl_qgroup_create(file, argp);
5608 case BTRFS_IOC_QGROUP_LIMIT:
5609 return btrfs_ioctl_qgroup_limit(file, argp);
5610 case BTRFS_IOC_QUOTA_RESCAN:
5611 return btrfs_ioctl_quota_rescan(file, argp);
5612 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5613 return btrfs_ioctl_quota_rescan_status(file, argp);
5614 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5615 return btrfs_ioctl_quota_rescan_wait(file, argp);
5616 case BTRFS_IOC_DEV_REPLACE:
5617 return btrfs_ioctl_dev_replace(root, argp);
5618 case BTRFS_IOC_GET_FSLABEL:
5619 return btrfs_ioctl_get_fslabel(file, argp);
5620 case BTRFS_IOC_SET_FSLABEL:
5621 return btrfs_ioctl_set_fslabel(file, argp);
5622 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5623 return btrfs_ioctl_get_supported_features(argp);
5624 case BTRFS_IOC_GET_FEATURES:
5625 return btrfs_ioctl_get_features(file, argp);
5626 case BTRFS_IOC_SET_FEATURES:
5627 return btrfs_ioctl_set_features(file, argp);
5633 #ifdef CONFIG_COMPAT
5634 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
5637 case FS_IOC32_GETFLAGS:
5638 cmd = FS_IOC_GETFLAGS;
5640 case FS_IOC32_SETFLAGS:
5641 cmd = FS_IOC_SETFLAGS;
5643 case FS_IOC32_GETVERSION:
5644 cmd = FS_IOC_GETVERSION;
5647 return -ENOIOCTLCMD;
5650 return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));