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 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
64 * structures are incorrect, as the timespec structure from userspace
65 * is 4 bytes too small. We define these alternatives here to teach
66 * the kernel about the 32-bit struct packing.
68 struct btrfs_ioctl_timespec_32 {
71 } __attribute__ ((__packed__));
73 struct btrfs_ioctl_received_subvol_args_32 {
74 char uuid[BTRFS_UUID_SIZE]; /* in */
75 __u64 stransid; /* in */
76 __u64 rtransid; /* out */
77 struct btrfs_ioctl_timespec_32 stime; /* in */
78 struct btrfs_ioctl_timespec_32 rtime; /* out */
80 __u64 reserved[16]; /* in */
81 } __attribute__ ((__packed__));
83 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
84 struct btrfs_ioctl_received_subvol_args_32)
88 static int btrfs_clone(struct inode *src, struct inode *inode,
89 u64 off, u64 olen, u64 olen_aligned, u64 destoff);
91 /* Mask out flags that are inappropriate for the given type of inode. */
92 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
96 else if (S_ISREG(mode))
97 return flags & ~FS_DIRSYNC_FL;
99 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
103 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
105 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
107 unsigned int iflags = 0;
109 if (flags & BTRFS_INODE_SYNC)
110 iflags |= FS_SYNC_FL;
111 if (flags & BTRFS_INODE_IMMUTABLE)
112 iflags |= FS_IMMUTABLE_FL;
113 if (flags & BTRFS_INODE_APPEND)
114 iflags |= FS_APPEND_FL;
115 if (flags & BTRFS_INODE_NODUMP)
116 iflags |= FS_NODUMP_FL;
117 if (flags & BTRFS_INODE_NOATIME)
118 iflags |= FS_NOATIME_FL;
119 if (flags & BTRFS_INODE_DIRSYNC)
120 iflags |= FS_DIRSYNC_FL;
121 if (flags & BTRFS_INODE_NODATACOW)
122 iflags |= FS_NOCOW_FL;
124 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
125 iflags |= FS_COMPR_FL;
126 else if (flags & BTRFS_INODE_NOCOMPRESS)
127 iflags |= FS_NOCOMP_FL;
133 * Update inode->i_flags based on the btrfs internal flags.
135 void btrfs_update_iflags(struct inode *inode)
137 struct btrfs_inode *ip = BTRFS_I(inode);
139 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
141 if (ip->flags & BTRFS_INODE_SYNC)
142 inode->i_flags |= S_SYNC;
143 if (ip->flags & BTRFS_INODE_IMMUTABLE)
144 inode->i_flags |= S_IMMUTABLE;
145 if (ip->flags & BTRFS_INODE_APPEND)
146 inode->i_flags |= S_APPEND;
147 if (ip->flags & BTRFS_INODE_NOATIME)
148 inode->i_flags |= S_NOATIME;
149 if (ip->flags & BTRFS_INODE_DIRSYNC)
150 inode->i_flags |= S_DIRSYNC;
154 * Inherit flags from the parent inode.
156 * Currently only the compression flags and the cow flags are inherited.
158 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
165 flags = BTRFS_I(dir)->flags;
167 if (flags & BTRFS_INODE_NOCOMPRESS) {
168 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
169 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
170 } else if (flags & BTRFS_INODE_COMPRESS) {
171 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
172 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
175 if (flags & BTRFS_INODE_NODATACOW) {
176 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
177 if (S_ISREG(inode->i_mode))
178 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
181 btrfs_update_iflags(inode);
184 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
186 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
187 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
189 if (copy_to_user(arg, &flags, sizeof(flags)))
194 static int check_flags(unsigned int flags)
196 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
197 FS_NOATIME_FL | FS_NODUMP_FL | \
198 FS_SYNC_FL | FS_DIRSYNC_FL | \
199 FS_NOCOMP_FL | FS_COMPR_FL |
203 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
209 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
211 struct inode *inode = file_inode(file);
212 struct btrfs_inode *ip = BTRFS_I(inode);
213 struct btrfs_root *root = ip->root;
214 struct btrfs_trans_handle *trans;
215 unsigned int flags, oldflags;
218 unsigned int i_oldflags;
221 if (!inode_owner_or_capable(inode))
224 if (btrfs_root_readonly(root))
227 if (copy_from_user(&flags, arg, sizeof(flags)))
230 ret = check_flags(flags);
234 ret = mnt_want_write_file(file);
238 mutex_lock(&inode->i_mutex);
240 ip_oldflags = ip->flags;
241 i_oldflags = inode->i_flags;
242 mode = inode->i_mode;
244 flags = btrfs_mask_flags(inode->i_mode, flags);
245 oldflags = btrfs_flags_to_ioctl(ip->flags);
246 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
247 if (!capable(CAP_LINUX_IMMUTABLE)) {
253 if (flags & FS_SYNC_FL)
254 ip->flags |= BTRFS_INODE_SYNC;
256 ip->flags &= ~BTRFS_INODE_SYNC;
257 if (flags & FS_IMMUTABLE_FL)
258 ip->flags |= BTRFS_INODE_IMMUTABLE;
260 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
261 if (flags & FS_APPEND_FL)
262 ip->flags |= BTRFS_INODE_APPEND;
264 ip->flags &= ~BTRFS_INODE_APPEND;
265 if (flags & FS_NODUMP_FL)
266 ip->flags |= BTRFS_INODE_NODUMP;
268 ip->flags &= ~BTRFS_INODE_NODUMP;
269 if (flags & FS_NOATIME_FL)
270 ip->flags |= BTRFS_INODE_NOATIME;
272 ip->flags &= ~BTRFS_INODE_NOATIME;
273 if (flags & FS_DIRSYNC_FL)
274 ip->flags |= BTRFS_INODE_DIRSYNC;
276 ip->flags &= ~BTRFS_INODE_DIRSYNC;
277 if (flags & FS_NOCOW_FL) {
280 * It's safe to turn csums off here, no extents exist.
281 * Otherwise we want the flag to reflect the real COW
282 * status of the file and will not set it.
284 if (inode->i_size == 0)
285 ip->flags |= BTRFS_INODE_NODATACOW
286 | BTRFS_INODE_NODATASUM;
288 ip->flags |= BTRFS_INODE_NODATACOW;
292 * Revert back under same assuptions as above
295 if (inode->i_size == 0)
296 ip->flags &= ~(BTRFS_INODE_NODATACOW
297 | BTRFS_INODE_NODATASUM);
299 ip->flags &= ~BTRFS_INODE_NODATACOW;
304 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
305 * flag may be changed automatically if compression code won't make
308 if (flags & FS_NOCOMP_FL) {
309 ip->flags &= ~BTRFS_INODE_COMPRESS;
310 ip->flags |= BTRFS_INODE_NOCOMPRESS;
312 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
313 if (ret && ret != -ENODATA)
315 } else if (flags & FS_COMPR_FL) {
318 ip->flags |= BTRFS_INODE_COMPRESS;
319 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
321 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
325 ret = btrfs_set_prop(inode, "btrfs.compression",
326 comp, strlen(comp), 0);
331 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
334 trans = btrfs_start_transaction(root, 1);
336 ret = PTR_ERR(trans);
340 btrfs_update_iflags(inode);
341 inode_inc_iversion(inode);
342 inode->i_ctime = CURRENT_TIME;
343 ret = btrfs_update_inode(trans, root, inode);
345 btrfs_end_transaction(trans, root);
348 ip->flags = ip_oldflags;
349 inode->i_flags = i_oldflags;
353 mutex_unlock(&inode->i_mutex);
354 mnt_drop_write_file(file);
358 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
360 struct inode *inode = file_inode(file);
362 return put_user(inode->i_generation, arg);
365 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
367 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
368 struct btrfs_device *device;
369 struct request_queue *q;
370 struct fstrim_range range;
371 u64 minlen = ULLONG_MAX;
373 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
376 if (!capable(CAP_SYS_ADMIN))
380 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
384 q = bdev_get_queue(device->bdev);
385 if (blk_queue_discard(q)) {
387 minlen = min((u64)q->limits.discard_granularity,
395 if (copy_from_user(&range, arg, sizeof(range)))
397 if (range.start > total_bytes ||
398 range.len < fs_info->sb->s_blocksize)
401 range.len = min(range.len, total_bytes - range.start);
402 range.minlen = max(range.minlen, minlen);
403 ret = btrfs_trim_fs(fs_info->tree_root, &range);
407 if (copy_to_user(arg, &range, sizeof(range)))
413 int btrfs_is_empty_uuid(u8 *uuid)
417 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
424 static noinline int create_subvol(struct inode *dir,
425 struct dentry *dentry,
426 char *name, int namelen,
428 struct btrfs_qgroup_inherit *inherit)
430 struct btrfs_trans_handle *trans;
431 struct btrfs_key key;
432 struct btrfs_root_item root_item;
433 struct btrfs_inode_item *inode_item;
434 struct extent_buffer *leaf;
435 struct btrfs_root *root = BTRFS_I(dir)->root;
436 struct btrfs_root *new_root;
437 struct btrfs_block_rsv block_rsv;
438 struct timespec cur_time = CURRENT_TIME;
443 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
448 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
452 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
454 * The same as the snapshot creation, please see the comment
455 * of create_snapshot().
457 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
458 8, &qgroup_reserved, false);
462 trans = btrfs_start_transaction(root, 0);
464 ret = PTR_ERR(trans);
465 btrfs_subvolume_release_metadata(root, &block_rsv,
469 trans->block_rsv = &block_rsv;
470 trans->bytes_reserved = block_rsv.size;
472 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
476 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
477 0, objectid, NULL, 0, 0, 0);
483 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
484 btrfs_set_header_bytenr(leaf, leaf->start);
485 btrfs_set_header_generation(leaf, trans->transid);
486 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
487 btrfs_set_header_owner(leaf, objectid);
489 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
491 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
492 btrfs_header_chunk_tree_uuid(leaf),
494 btrfs_mark_buffer_dirty(leaf);
496 memset(&root_item, 0, sizeof(root_item));
498 inode_item = &root_item.inode;
499 btrfs_set_stack_inode_generation(inode_item, 1);
500 btrfs_set_stack_inode_size(inode_item, 3);
501 btrfs_set_stack_inode_nlink(inode_item, 1);
502 btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
503 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
505 btrfs_set_root_flags(&root_item, 0);
506 btrfs_set_root_limit(&root_item, 0);
507 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
509 btrfs_set_root_bytenr(&root_item, leaf->start);
510 btrfs_set_root_generation(&root_item, trans->transid);
511 btrfs_set_root_level(&root_item, 0);
512 btrfs_set_root_refs(&root_item, 1);
513 btrfs_set_root_used(&root_item, leaf->len);
514 btrfs_set_root_last_snapshot(&root_item, 0);
516 btrfs_set_root_generation_v2(&root_item,
517 btrfs_root_generation(&root_item));
518 uuid_le_gen(&new_uuid);
519 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
520 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
521 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
522 root_item.ctime = root_item.otime;
523 btrfs_set_root_ctransid(&root_item, trans->transid);
524 btrfs_set_root_otransid(&root_item, trans->transid);
526 btrfs_tree_unlock(leaf);
527 free_extent_buffer(leaf);
530 btrfs_set_root_dirid(&root_item, new_dirid);
532 key.objectid = objectid;
534 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
535 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
540 key.offset = (u64)-1;
541 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
542 if (IS_ERR(new_root)) {
543 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
544 ret = PTR_ERR(new_root);
548 btrfs_record_root_in_trans(trans, new_root);
550 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
552 /* We potentially lose an unused inode item here */
553 btrfs_abort_transaction(trans, root, ret);
558 * insert the directory item
560 ret = btrfs_set_inode_index(dir, &index);
562 btrfs_abort_transaction(trans, root, ret);
566 ret = btrfs_insert_dir_item(trans, root,
567 name, namelen, dir, &key,
568 BTRFS_FT_DIR, index);
570 btrfs_abort_transaction(trans, root, ret);
574 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
575 ret = btrfs_update_inode(trans, root, dir);
578 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
579 objectid, root->root_key.objectid,
580 btrfs_ino(dir), index, name, namelen);
583 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
584 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
587 btrfs_abort_transaction(trans, root, ret);
590 trans->block_rsv = NULL;
591 trans->bytes_reserved = 0;
592 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
595 *async_transid = trans->transid;
596 err = btrfs_commit_transaction_async(trans, root, 1);
598 err = btrfs_commit_transaction(trans, root);
600 err = btrfs_commit_transaction(trans, root);
606 inode = btrfs_lookup_dentry(dir, dentry);
608 return PTR_ERR(inode);
609 d_instantiate(dentry, inode);
614 static void btrfs_wait_nocow_write(struct btrfs_root *root)
620 prepare_to_wait(&root->subv_writers->wait, &wait,
621 TASK_UNINTERRUPTIBLE);
623 writers = percpu_counter_sum(&root->subv_writers->counter);
627 finish_wait(&root->subv_writers->wait, &wait);
631 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
632 struct dentry *dentry, char *name, int namelen,
633 u64 *async_transid, bool readonly,
634 struct btrfs_qgroup_inherit *inherit)
637 struct btrfs_pending_snapshot *pending_snapshot;
638 struct btrfs_trans_handle *trans;
644 atomic_inc(&root->will_be_snapshoted);
645 smp_mb__after_atomic();
646 btrfs_wait_nocow_write(root);
648 ret = btrfs_start_delalloc_inodes(root, 0);
652 btrfs_wait_ordered_extents(root, -1);
654 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
655 if (!pending_snapshot) {
660 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
661 BTRFS_BLOCK_RSV_TEMP);
663 * 1 - parent dir inode
666 * 2 - root ref/backref
667 * 1 - root of snapshot
670 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
671 &pending_snapshot->block_rsv, 8,
672 &pending_snapshot->qgroup_reserved,
677 pending_snapshot->dentry = dentry;
678 pending_snapshot->root = root;
679 pending_snapshot->readonly = readonly;
680 pending_snapshot->dir = dir;
681 pending_snapshot->inherit = inherit;
683 trans = btrfs_start_transaction(root, 0);
685 ret = PTR_ERR(trans);
689 spin_lock(&root->fs_info->trans_lock);
690 list_add(&pending_snapshot->list,
691 &trans->transaction->pending_snapshots);
692 spin_unlock(&root->fs_info->trans_lock);
694 *async_transid = trans->transid;
695 ret = btrfs_commit_transaction_async(trans,
696 root->fs_info->extent_root, 1);
698 ret = btrfs_commit_transaction(trans, root);
700 ret = btrfs_commit_transaction(trans,
701 root->fs_info->extent_root);
706 ret = pending_snapshot->error;
710 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
714 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
716 ret = PTR_ERR(inode);
720 d_instantiate(dentry, inode);
723 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
724 &pending_snapshot->block_rsv,
725 pending_snapshot->qgroup_reserved);
727 kfree(pending_snapshot);
729 atomic_dec(&root->will_be_snapshoted);
733 /* copy of check_sticky in fs/namei.c()
734 * It's inline, so penalty for filesystems that don't use sticky bit is
737 static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
739 kuid_t fsuid = current_fsuid();
741 if (!(dir->i_mode & S_ISVTX))
743 if (uid_eq(inode->i_uid, fsuid))
745 if (uid_eq(dir->i_uid, fsuid))
747 return !capable(CAP_FOWNER);
750 /* copy of may_delete in fs/namei.c()
751 * Check whether we can remove a link victim from directory dir, check
752 * whether the type of victim is right.
753 * 1. We can't do it if dir is read-only (done in permission())
754 * 2. We should have write and exec permissions on dir
755 * 3. We can't remove anything from append-only dir
756 * 4. We can't do anything with immutable dir (done in permission())
757 * 5. If the sticky bit on dir is set we should either
758 * a. be owner of dir, or
759 * b. be owner of victim, or
760 * c. have CAP_FOWNER capability
761 * 6. If the victim is append-only or immutable we can't do antyhing with
762 * links pointing to it.
763 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
764 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
765 * 9. We can't remove a root or mountpoint.
766 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
767 * nfs_async_unlink().
770 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
774 if (!victim->d_inode)
777 BUG_ON(victim->d_parent->d_inode != dir);
778 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
780 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
785 if (btrfs_check_sticky(dir, victim->d_inode)||
786 IS_APPEND(victim->d_inode)||
787 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
790 if (!S_ISDIR(victim->d_inode->i_mode))
794 } else if (S_ISDIR(victim->d_inode->i_mode))
798 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
803 /* copy of may_create in fs/namei.c() */
804 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
810 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
814 * Create a new subvolume below @parent. This is largely modeled after
815 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
816 * inside this filesystem so it's quite a bit simpler.
818 static noinline int btrfs_mksubvol(struct path *parent,
819 char *name, int namelen,
820 struct btrfs_root *snap_src,
821 u64 *async_transid, bool readonly,
822 struct btrfs_qgroup_inherit *inherit)
824 struct inode *dir = parent->dentry->d_inode;
825 struct dentry *dentry;
828 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
832 dentry = lookup_one_len(name, parent->dentry, namelen);
833 error = PTR_ERR(dentry);
841 error = btrfs_may_create(dir, dentry);
846 * even if this name doesn't exist, we may get hash collisions.
847 * check for them now when we can safely fail
849 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
855 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
857 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
861 error = create_snapshot(snap_src, dir, dentry, name, namelen,
862 async_transid, readonly, inherit);
864 error = create_subvol(dir, dentry, name, namelen,
865 async_transid, inherit);
868 fsnotify_mkdir(dir, dentry);
870 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
874 mutex_unlock(&dir->i_mutex);
879 * When we're defragging a range, we don't want to kick it off again
880 * if it is really just waiting for delalloc to send it down.
881 * If we find a nice big extent or delalloc range for the bytes in the
882 * file you want to defrag, we return 0 to let you know to skip this
885 static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
887 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
888 struct extent_map *em = NULL;
889 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
892 read_lock(&em_tree->lock);
893 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
894 read_unlock(&em_tree->lock);
897 end = extent_map_end(em);
899 if (end - offset > thresh)
902 /* if we already have a nice delalloc here, just stop */
904 end = count_range_bits(io_tree, &offset, offset + thresh,
905 thresh, EXTENT_DELALLOC, 1);
912 * helper function to walk through a file and find extents
913 * newer than a specific transid, and smaller than thresh.
915 * This is used by the defragging code to find new and small
918 static int find_new_extents(struct btrfs_root *root,
919 struct inode *inode, u64 newer_than,
920 u64 *off, int thresh)
922 struct btrfs_path *path;
923 struct btrfs_key min_key;
924 struct extent_buffer *leaf;
925 struct btrfs_file_extent_item *extent;
928 u64 ino = btrfs_ino(inode);
930 path = btrfs_alloc_path();
934 min_key.objectid = ino;
935 min_key.type = BTRFS_EXTENT_DATA_KEY;
936 min_key.offset = *off;
939 path->keep_locks = 1;
940 ret = btrfs_search_forward(root, &min_key, path, newer_than);
943 path->keep_locks = 0;
944 btrfs_unlock_up_safe(path, 1);
946 if (min_key.objectid != ino)
948 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
951 leaf = path->nodes[0];
952 extent = btrfs_item_ptr(leaf, path->slots[0],
953 struct btrfs_file_extent_item);
955 type = btrfs_file_extent_type(leaf, extent);
956 if (type == BTRFS_FILE_EXTENT_REG &&
957 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
958 check_defrag_in_cache(inode, min_key.offset, thresh)) {
959 *off = min_key.offset;
960 btrfs_free_path(path);
965 if (path->slots[0] < btrfs_header_nritems(leaf)) {
966 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
970 if (min_key.offset == (u64)-1)
974 btrfs_release_path(path);
977 btrfs_free_path(path);
981 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
983 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
984 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
985 struct extent_map *em;
986 u64 len = PAGE_CACHE_SIZE;
989 * hopefully we have this extent in the tree already, try without
990 * the full extent lock
992 read_lock(&em_tree->lock);
993 em = lookup_extent_mapping(em_tree, start, len);
994 read_unlock(&em_tree->lock);
997 struct extent_state *cached = NULL;
998 u64 end = start + len - 1;
1000 /* get the big lock and read metadata off disk */
1001 lock_extent_bits(io_tree, start, end, 0, &cached);
1002 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1003 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
1012 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1014 struct extent_map *next;
1017 /* this is the last extent */
1018 if (em->start + em->len >= i_size_read(inode))
1021 next = defrag_lookup_extent(inode, em->start + em->len);
1022 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE ||
1023 (em->block_start + em->block_len == next->block_start))
1026 free_extent_map(next);
1030 static int should_defrag_range(struct inode *inode, u64 start, int thresh,
1031 u64 *last_len, u64 *skip, u64 *defrag_end,
1034 struct extent_map *em;
1036 bool next_mergeable = true;
1039 * make sure that once we start defragging an extent, we keep on
1042 if (start < *defrag_end)
1047 em = defrag_lookup_extent(inode, start);
1051 /* this will cover holes, and inline extents */
1052 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1057 next_mergeable = defrag_check_next_extent(inode, em);
1060 * we hit a real extent, if it is big or the next extent is not a
1061 * real extent, don't bother defragging it
1063 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1064 (em->len >= thresh || !next_mergeable))
1068 * last_len ends up being a counter of how many bytes we've defragged.
1069 * every time we choose not to defrag an extent, we reset *last_len
1070 * so that the next tiny extent will force a defrag.
1072 * The end result of this is that tiny extents before a single big
1073 * extent will force at least part of that big extent to be defragged.
1076 *defrag_end = extent_map_end(em);
1079 *skip = extent_map_end(em);
1083 free_extent_map(em);
1088 * it doesn't do much good to defrag one or two pages
1089 * at a time. This pulls in a nice chunk of pages
1090 * to COW and defrag.
1092 * It also makes sure the delalloc code has enough
1093 * dirty data to avoid making new small extents as part
1096 * It's a good idea to start RA on this range
1097 * before calling this.
1099 static int cluster_pages_for_defrag(struct inode *inode,
1100 struct page **pages,
1101 unsigned long start_index,
1102 unsigned long num_pages)
1104 unsigned long file_end;
1105 u64 isize = i_size_read(inode);
1112 struct btrfs_ordered_extent *ordered;
1113 struct extent_state *cached_state = NULL;
1114 struct extent_io_tree *tree;
1115 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1117 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1118 if (!isize || start_index > file_end)
1121 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1123 ret = btrfs_delalloc_reserve_space(inode,
1124 page_cnt << PAGE_CACHE_SHIFT);
1128 tree = &BTRFS_I(inode)->io_tree;
1130 /* step one, lock all the pages */
1131 for (i = 0; i < page_cnt; i++) {
1134 page = find_or_create_page(inode->i_mapping,
1135 start_index + i, mask);
1139 page_start = page_offset(page);
1140 page_end = page_start + PAGE_CACHE_SIZE - 1;
1142 lock_extent_bits(tree, page_start, page_end,
1144 ordered = btrfs_lookup_ordered_extent(inode,
1146 unlock_extent_cached(tree, page_start, page_end,
1147 &cached_state, GFP_NOFS);
1152 btrfs_start_ordered_extent(inode, ordered, 1);
1153 btrfs_put_ordered_extent(ordered);
1156 * we unlocked the page above, so we need check if
1157 * it was released or not.
1159 if (page->mapping != inode->i_mapping) {
1161 page_cache_release(page);
1166 if (!PageUptodate(page)) {
1167 btrfs_readpage(NULL, page);
1169 if (!PageUptodate(page)) {
1171 page_cache_release(page);
1177 if (page->mapping != inode->i_mapping) {
1179 page_cache_release(page);
1189 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1193 * so now we have a nice long stream of locked
1194 * and up to date pages, lets wait on them
1196 for (i = 0; i < i_done; i++)
1197 wait_on_page_writeback(pages[i]);
1199 page_start = page_offset(pages[0]);
1200 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1202 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1203 page_start, page_end - 1, 0, &cached_state);
1204 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1205 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1206 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1207 &cached_state, GFP_NOFS);
1209 if (i_done != page_cnt) {
1210 spin_lock(&BTRFS_I(inode)->lock);
1211 BTRFS_I(inode)->outstanding_extents++;
1212 spin_unlock(&BTRFS_I(inode)->lock);
1213 btrfs_delalloc_release_space(inode,
1214 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1218 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1219 &cached_state, GFP_NOFS);
1221 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1222 page_start, page_end - 1, &cached_state,
1225 for (i = 0; i < i_done; i++) {
1226 clear_page_dirty_for_io(pages[i]);
1227 ClearPageChecked(pages[i]);
1228 set_page_extent_mapped(pages[i]);
1229 set_page_dirty(pages[i]);
1230 unlock_page(pages[i]);
1231 page_cache_release(pages[i]);
1235 for (i = 0; i < i_done; i++) {
1236 unlock_page(pages[i]);
1237 page_cache_release(pages[i]);
1239 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
1244 int btrfs_defrag_file(struct inode *inode, struct file *file,
1245 struct btrfs_ioctl_defrag_range_args *range,
1246 u64 newer_than, unsigned long max_to_defrag)
1248 struct btrfs_root *root = BTRFS_I(inode)->root;
1249 struct file_ra_state *ra = NULL;
1250 unsigned long last_index;
1251 u64 isize = i_size_read(inode);
1255 u64 newer_off = range->start;
1257 unsigned long ra_index = 0;
1259 int defrag_count = 0;
1260 int compress_type = BTRFS_COMPRESS_ZLIB;
1261 int extent_thresh = range->extent_thresh;
1262 unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1263 unsigned long cluster = max_cluster;
1264 u64 new_align = ~((u64)128 * 1024 - 1);
1265 struct page **pages = NULL;
1270 if (range->start >= isize)
1273 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1274 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1276 if (range->compress_type)
1277 compress_type = range->compress_type;
1280 if (extent_thresh == 0)
1281 extent_thresh = 256 * 1024;
1284 * if we were not given a file, allocate a readahead
1288 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1291 file_ra_state_init(ra, inode->i_mapping);
1296 pages = kmalloc_array(max_cluster, sizeof(struct page *),
1303 /* find the last page to defrag */
1304 if (range->start + range->len > range->start) {
1305 last_index = min_t(u64, isize - 1,
1306 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1308 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1312 ret = find_new_extents(root, inode, newer_than,
1313 &newer_off, 64 * 1024);
1315 range->start = newer_off;
1317 * we always align our defrag to help keep
1318 * the extents in the file evenly spaced
1320 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1324 i = range->start >> PAGE_CACHE_SHIFT;
1327 max_to_defrag = last_index + 1;
1330 * make writeback starts from i, so the defrag range can be
1331 * written sequentially.
1333 if (i < inode->i_mapping->writeback_index)
1334 inode->i_mapping->writeback_index = i;
1336 while (i <= last_index && defrag_count < max_to_defrag &&
1337 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1338 PAGE_CACHE_SHIFT)) {
1340 * make sure we stop running if someone unmounts
1343 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1346 if (btrfs_defrag_cancelled(root->fs_info)) {
1347 printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
1352 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1353 extent_thresh, &last_len, &skip,
1354 &defrag_end, range->flags &
1355 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1358 * the should_defrag function tells us how much to skip
1359 * bump our counter by the suggested amount
1361 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1362 i = max(i + 1, next);
1367 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1368 PAGE_CACHE_SHIFT) - i;
1369 cluster = min(cluster, max_cluster);
1371 cluster = max_cluster;
1374 if (i + cluster > ra_index) {
1375 ra_index = max(i, ra_index);
1376 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1378 ra_index += max_cluster;
1381 mutex_lock(&inode->i_mutex);
1382 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1383 BTRFS_I(inode)->force_compress = compress_type;
1384 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1386 mutex_unlock(&inode->i_mutex);
1390 defrag_count += ret;
1391 balance_dirty_pages_ratelimited(inode->i_mapping);
1392 mutex_unlock(&inode->i_mutex);
1395 if (newer_off == (u64)-1)
1401 newer_off = max(newer_off + 1,
1402 (u64)i << PAGE_CACHE_SHIFT);
1404 ret = find_new_extents(root, inode,
1405 newer_than, &newer_off,
1408 range->start = newer_off;
1409 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1416 last_len += ret << PAGE_CACHE_SHIFT;
1424 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1425 filemap_flush(inode->i_mapping);
1426 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1427 &BTRFS_I(inode)->runtime_flags))
1428 filemap_flush(inode->i_mapping);
1431 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1432 /* the filemap_flush will queue IO into the worker threads, but
1433 * we have to make sure the IO is actually started and that
1434 * ordered extents get created before we return
1436 atomic_inc(&root->fs_info->async_submit_draining);
1437 while (atomic_read(&root->fs_info->nr_async_submits) ||
1438 atomic_read(&root->fs_info->async_delalloc_pages)) {
1439 wait_event(root->fs_info->async_submit_wait,
1440 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1441 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1443 atomic_dec(&root->fs_info->async_submit_draining);
1446 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1447 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1453 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1454 mutex_lock(&inode->i_mutex);
1455 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1456 mutex_unlock(&inode->i_mutex);
1464 static noinline int btrfs_ioctl_resize(struct file *file,
1470 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1471 struct btrfs_ioctl_vol_args *vol_args;
1472 struct btrfs_trans_handle *trans;
1473 struct btrfs_device *device = NULL;
1476 char *devstr = NULL;
1480 if (!capable(CAP_SYS_ADMIN))
1483 ret = mnt_want_write_file(file);
1487 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1489 mnt_drop_write_file(file);
1490 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1493 mutex_lock(&root->fs_info->volume_mutex);
1494 vol_args = memdup_user(arg, sizeof(*vol_args));
1495 if (IS_ERR(vol_args)) {
1496 ret = PTR_ERR(vol_args);
1500 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1502 sizestr = vol_args->name;
1503 devstr = strchr(sizestr, ':');
1506 sizestr = devstr + 1;
1508 devstr = vol_args->name;
1509 devid = simple_strtoull(devstr, &end, 10);
1514 btrfs_info(root->fs_info, "resizing devid %llu", devid);
1517 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1519 btrfs_info(root->fs_info, "resizer unable to find device %llu",
1525 if (!device->writeable) {
1526 btrfs_info(root->fs_info,
1527 "resizer unable to apply on readonly device %llu",
1533 if (!strcmp(sizestr, "max"))
1534 new_size = device->bdev->bd_inode->i_size;
1536 if (sizestr[0] == '-') {
1539 } else if (sizestr[0] == '+') {
1543 new_size = memparse(sizestr, &retptr);
1544 if (*retptr != '\0' || new_size == 0) {
1550 if (device->is_tgtdev_for_dev_replace) {
1555 old_size = device->total_bytes;
1558 if (new_size > old_size) {
1562 new_size = old_size - new_size;
1563 } else if (mod > 0) {
1564 if (new_size > ULLONG_MAX - old_size) {
1568 new_size = old_size + new_size;
1571 if (new_size < 256 * 1024 * 1024) {
1575 if (new_size > device->bdev->bd_inode->i_size) {
1580 do_div(new_size, root->sectorsize);
1581 new_size *= root->sectorsize;
1583 printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
1584 rcu_str_deref(device->name), new_size);
1586 if (new_size > old_size) {
1587 trans = btrfs_start_transaction(root, 0);
1588 if (IS_ERR(trans)) {
1589 ret = PTR_ERR(trans);
1592 ret = btrfs_grow_device(trans, device, new_size);
1593 btrfs_commit_transaction(trans, root);
1594 } else if (new_size < old_size) {
1595 ret = btrfs_shrink_device(device, new_size);
1596 } /* equal, nothing need to do */
1601 mutex_unlock(&root->fs_info->volume_mutex);
1602 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1603 mnt_drop_write_file(file);
1607 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1608 char *name, unsigned long fd, int subvol,
1609 u64 *transid, bool readonly,
1610 struct btrfs_qgroup_inherit *inherit)
1615 ret = mnt_want_write_file(file);
1619 namelen = strlen(name);
1620 if (strchr(name, '/')) {
1622 goto out_drop_write;
1625 if (name[0] == '.' &&
1626 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1628 goto out_drop_write;
1632 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1633 NULL, transid, readonly, inherit);
1635 struct fd src = fdget(fd);
1636 struct inode *src_inode;
1639 goto out_drop_write;
1642 src_inode = file_inode(src.file);
1643 if (src_inode->i_sb != file_inode(file)->i_sb) {
1644 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1645 "Snapshot src from another FS");
1647 } else if (!inode_owner_or_capable(src_inode)) {
1649 * Subvolume creation is not restricted, but snapshots
1650 * are limited to own subvolumes only
1654 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1655 BTRFS_I(src_inode)->root,
1656 transid, readonly, inherit);
1661 mnt_drop_write_file(file);
1666 static noinline int btrfs_ioctl_snap_create(struct file *file,
1667 void __user *arg, int subvol)
1669 struct btrfs_ioctl_vol_args *vol_args;
1672 vol_args = memdup_user(arg, sizeof(*vol_args));
1673 if (IS_ERR(vol_args))
1674 return PTR_ERR(vol_args);
1675 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1677 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1678 vol_args->fd, subvol,
1685 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1686 void __user *arg, int subvol)
1688 struct btrfs_ioctl_vol_args_v2 *vol_args;
1692 bool readonly = false;
1693 struct btrfs_qgroup_inherit *inherit = NULL;
1695 vol_args = memdup_user(arg, sizeof(*vol_args));
1696 if (IS_ERR(vol_args))
1697 return PTR_ERR(vol_args);
1698 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1700 if (vol_args->flags &
1701 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1702 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1707 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1709 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1711 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1712 if (vol_args->size > PAGE_CACHE_SIZE) {
1716 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1717 if (IS_ERR(inherit)) {
1718 ret = PTR_ERR(inherit);
1723 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1724 vol_args->fd, subvol, ptr,
1727 if (ret == 0 && ptr &&
1729 offsetof(struct btrfs_ioctl_vol_args_v2,
1730 transid), ptr, sizeof(*ptr)))
1738 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1741 struct inode *inode = file_inode(file);
1742 struct btrfs_root *root = BTRFS_I(inode)->root;
1746 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1749 down_read(&root->fs_info->subvol_sem);
1750 if (btrfs_root_readonly(root))
1751 flags |= BTRFS_SUBVOL_RDONLY;
1752 up_read(&root->fs_info->subvol_sem);
1754 if (copy_to_user(arg, &flags, sizeof(flags)))
1760 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1763 struct inode *inode = file_inode(file);
1764 struct btrfs_root *root = BTRFS_I(inode)->root;
1765 struct btrfs_trans_handle *trans;
1770 if (!inode_owner_or_capable(inode))
1773 ret = mnt_want_write_file(file);
1777 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1779 goto out_drop_write;
1782 if (copy_from_user(&flags, arg, sizeof(flags))) {
1784 goto out_drop_write;
1787 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1789 goto out_drop_write;
1792 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1794 goto out_drop_write;
1797 down_write(&root->fs_info->subvol_sem);
1800 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1803 root_flags = btrfs_root_flags(&root->root_item);
1804 if (flags & BTRFS_SUBVOL_RDONLY) {
1805 btrfs_set_root_flags(&root->root_item,
1806 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1809 * Block RO -> RW transition if this subvolume is involved in
1812 spin_lock(&root->root_item_lock);
1813 if (root->send_in_progress == 0) {
1814 btrfs_set_root_flags(&root->root_item,
1815 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1816 spin_unlock(&root->root_item_lock);
1818 spin_unlock(&root->root_item_lock);
1819 btrfs_warn(root->fs_info,
1820 "Attempt to set subvolume %llu read-write during send",
1821 root->root_key.objectid);
1827 trans = btrfs_start_transaction(root, 1);
1828 if (IS_ERR(trans)) {
1829 ret = PTR_ERR(trans);
1833 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1834 &root->root_key, &root->root_item);
1836 btrfs_commit_transaction(trans, root);
1839 btrfs_set_root_flags(&root->root_item, root_flags);
1841 up_write(&root->fs_info->subvol_sem);
1843 mnt_drop_write_file(file);
1849 * helper to check if the subvolume references other subvolumes
1851 static noinline int may_destroy_subvol(struct btrfs_root *root)
1853 struct btrfs_path *path;
1854 struct btrfs_dir_item *di;
1855 struct btrfs_key key;
1859 path = btrfs_alloc_path();
1863 /* Make sure this root isn't set as the default subvol */
1864 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1865 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1866 dir_id, "default", 7, 0);
1867 if (di && !IS_ERR(di)) {
1868 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1869 if (key.objectid == root->root_key.objectid) {
1871 btrfs_err(root->fs_info, "deleting default subvolume "
1872 "%llu is not allowed", key.objectid);
1875 btrfs_release_path(path);
1878 key.objectid = root->root_key.objectid;
1879 key.type = BTRFS_ROOT_REF_KEY;
1880 key.offset = (u64)-1;
1882 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1889 if (path->slots[0] > 0) {
1891 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1892 if (key.objectid == root->root_key.objectid &&
1893 key.type == BTRFS_ROOT_REF_KEY)
1897 btrfs_free_path(path);
1901 static noinline int key_in_sk(struct btrfs_key *key,
1902 struct btrfs_ioctl_search_key *sk)
1904 struct btrfs_key test;
1907 test.objectid = sk->min_objectid;
1908 test.type = sk->min_type;
1909 test.offset = sk->min_offset;
1911 ret = btrfs_comp_cpu_keys(key, &test);
1915 test.objectid = sk->max_objectid;
1916 test.type = sk->max_type;
1917 test.offset = sk->max_offset;
1919 ret = btrfs_comp_cpu_keys(key, &test);
1925 static noinline int copy_to_sk(struct btrfs_root *root,
1926 struct btrfs_path *path,
1927 struct btrfs_key *key,
1928 struct btrfs_ioctl_search_key *sk,
1930 unsigned long *sk_offset,
1934 struct extent_buffer *leaf;
1935 struct btrfs_ioctl_search_header sh;
1936 unsigned long item_off;
1937 unsigned long item_len;
1943 leaf = path->nodes[0];
1944 slot = path->slots[0];
1945 nritems = btrfs_header_nritems(leaf);
1947 if (btrfs_header_generation(leaf) > sk->max_transid) {
1951 found_transid = btrfs_header_generation(leaf);
1953 for (i = slot; i < nritems; i++) {
1954 item_off = btrfs_item_ptr_offset(leaf, i);
1955 item_len = btrfs_item_size_nr(leaf, i);
1957 btrfs_item_key_to_cpu(leaf, key, i);
1958 if (!key_in_sk(key, sk))
1961 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1964 if (sizeof(sh) + item_len + *sk_offset >
1965 BTRFS_SEARCH_ARGS_BUFSIZE) {
1970 sh.objectid = key->objectid;
1971 sh.offset = key->offset;
1972 sh.type = key->type;
1974 sh.transid = found_transid;
1976 /* copy search result header */
1977 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1978 *sk_offset += sizeof(sh);
1981 char *p = buf + *sk_offset;
1983 read_extent_buffer(leaf, p,
1984 item_off, item_len);
1985 *sk_offset += item_len;
1989 if (*num_found >= sk->nr_items)
1994 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1996 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1999 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
2009 static noinline int search_ioctl(struct inode *inode,
2010 struct btrfs_ioctl_search_args *args)
2012 struct btrfs_root *root;
2013 struct btrfs_key key;
2014 struct btrfs_path *path;
2015 struct btrfs_ioctl_search_key *sk = &args->key;
2016 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2019 unsigned long sk_offset = 0;
2021 path = btrfs_alloc_path();
2025 if (sk->tree_id == 0) {
2026 /* search the root of the inode that was passed */
2027 root = BTRFS_I(inode)->root;
2029 key.objectid = sk->tree_id;
2030 key.type = BTRFS_ROOT_ITEM_KEY;
2031 key.offset = (u64)-1;
2032 root = btrfs_read_fs_root_no_name(info, &key);
2034 printk(KERN_ERR "BTRFS: could not find root %llu\n",
2036 btrfs_free_path(path);
2041 key.objectid = sk->min_objectid;
2042 key.type = sk->min_type;
2043 key.offset = sk->min_offset;
2045 path->keep_locks = 1;
2048 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2054 ret = copy_to_sk(root, path, &key, sk, args->buf,
2055 &sk_offset, &num_found);
2056 btrfs_release_path(path);
2057 if (ret || num_found >= sk->nr_items)
2063 sk->nr_items = num_found;
2064 btrfs_free_path(path);
2068 static noinline int btrfs_ioctl_tree_search(struct file *file,
2071 struct btrfs_ioctl_search_args *args;
2072 struct inode *inode;
2075 if (!capable(CAP_SYS_ADMIN))
2078 args = memdup_user(argp, sizeof(*args));
2080 return PTR_ERR(args);
2082 inode = file_inode(file);
2083 ret = search_ioctl(inode, args);
2084 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2091 * Search INODE_REFs to identify path name of 'dirid' directory
2092 * in a 'tree_id' tree. and sets path name to 'name'.
2094 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2095 u64 tree_id, u64 dirid, char *name)
2097 struct btrfs_root *root;
2098 struct btrfs_key key;
2104 struct btrfs_inode_ref *iref;
2105 struct extent_buffer *l;
2106 struct btrfs_path *path;
2108 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2113 path = btrfs_alloc_path();
2117 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2119 key.objectid = tree_id;
2120 key.type = BTRFS_ROOT_ITEM_KEY;
2121 key.offset = (u64)-1;
2122 root = btrfs_read_fs_root_no_name(info, &key);
2124 printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
2129 key.objectid = dirid;
2130 key.type = BTRFS_INODE_REF_KEY;
2131 key.offset = (u64)-1;
2134 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2138 ret = btrfs_previous_item(root, path, dirid,
2139 BTRFS_INODE_REF_KEY);
2149 slot = path->slots[0];
2150 btrfs_item_key_to_cpu(l, &key, slot);
2152 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2153 len = btrfs_inode_ref_name_len(l, iref);
2155 total_len += len + 1;
2157 ret = -ENAMETOOLONG;
2162 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2164 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2167 btrfs_release_path(path);
2168 key.objectid = key.offset;
2169 key.offset = (u64)-1;
2170 dirid = key.objectid;
2172 memmove(name, ptr, total_len);
2173 name[total_len] = '\0';
2176 btrfs_free_path(path);
2180 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2183 struct btrfs_ioctl_ino_lookup_args *args;
2184 struct inode *inode;
2187 if (!capable(CAP_SYS_ADMIN))
2190 args = memdup_user(argp, sizeof(*args));
2192 return PTR_ERR(args);
2194 inode = file_inode(file);
2196 if (args->treeid == 0)
2197 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2199 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2200 args->treeid, args->objectid,
2203 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2210 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2213 struct dentry *parent = file->f_path.dentry;
2214 struct dentry *dentry;
2215 struct inode *dir = parent->d_inode;
2216 struct inode *inode;
2217 struct btrfs_root *root = BTRFS_I(dir)->root;
2218 struct btrfs_root *dest = NULL;
2219 struct btrfs_ioctl_vol_args *vol_args;
2220 struct btrfs_trans_handle *trans;
2221 struct btrfs_block_rsv block_rsv;
2222 u64 qgroup_reserved;
2227 vol_args = memdup_user(arg, sizeof(*vol_args));
2228 if (IS_ERR(vol_args))
2229 return PTR_ERR(vol_args);
2231 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2232 namelen = strlen(vol_args->name);
2233 if (strchr(vol_args->name, '/') ||
2234 strncmp(vol_args->name, "..", namelen) == 0) {
2239 err = mnt_want_write_file(file);
2243 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2245 goto out_drop_write;
2246 dentry = lookup_one_len(vol_args->name, parent, namelen);
2247 if (IS_ERR(dentry)) {
2248 err = PTR_ERR(dentry);
2249 goto out_unlock_dir;
2252 if (!dentry->d_inode) {
2257 inode = dentry->d_inode;
2258 dest = BTRFS_I(inode)->root;
2259 if (!capable(CAP_SYS_ADMIN)) {
2261 * Regular user. Only allow this with a special mount
2262 * option, when the user has write+exec access to the
2263 * subvol root, and when rmdir(2) would have been
2266 * Note that this is _not_ check that the subvol is
2267 * empty or doesn't contain data that we wouldn't
2268 * otherwise be able to delete.
2270 * Users who want to delete empty subvols should try
2274 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2278 * Do not allow deletion if the parent dir is the same
2279 * as the dir to be deleted. That means the ioctl
2280 * must be called on the dentry referencing the root
2281 * of the subvol, not a random directory contained
2288 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2293 /* check if subvolume may be deleted by a user */
2294 err = btrfs_may_delete(dir, dentry, 1);
2298 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2303 mutex_lock(&inode->i_mutex);
2304 err = d_invalidate(dentry);
2308 down_write(&root->fs_info->subvol_sem);
2310 err = may_destroy_subvol(dest);
2314 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2316 * One for dir inode, two for dir entries, two for root
2319 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2320 5, &qgroup_reserved, true);
2324 trans = btrfs_start_transaction(root, 0);
2325 if (IS_ERR(trans)) {
2326 err = PTR_ERR(trans);
2329 trans->block_rsv = &block_rsv;
2330 trans->bytes_reserved = block_rsv.size;
2332 ret = btrfs_unlink_subvol(trans, root, dir,
2333 dest->root_key.objectid,
2334 dentry->d_name.name,
2335 dentry->d_name.len);
2338 btrfs_abort_transaction(trans, root, ret);
2342 btrfs_record_root_in_trans(trans, dest);
2344 memset(&dest->root_item.drop_progress, 0,
2345 sizeof(dest->root_item.drop_progress));
2346 dest->root_item.drop_level = 0;
2347 btrfs_set_root_refs(&dest->root_item, 0);
2349 if (!xchg(&dest->orphan_item_inserted, 1)) {
2350 ret = btrfs_insert_orphan_item(trans,
2351 root->fs_info->tree_root,
2352 dest->root_key.objectid);
2354 btrfs_abort_transaction(trans, root, ret);
2360 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2361 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2362 dest->root_key.objectid);
2363 if (ret && ret != -ENOENT) {
2364 btrfs_abort_transaction(trans, root, ret);
2368 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2369 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2370 dest->root_item.received_uuid,
2371 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2372 dest->root_key.objectid);
2373 if (ret && ret != -ENOENT) {
2374 btrfs_abort_transaction(trans, root, ret);
2381 trans->block_rsv = NULL;
2382 trans->bytes_reserved = 0;
2383 ret = btrfs_end_transaction(trans, root);
2386 inode->i_flags |= S_DEAD;
2388 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2390 up_write(&root->fs_info->subvol_sem);
2392 mutex_unlock(&inode->i_mutex);
2394 shrink_dcache_sb(root->fs_info->sb);
2395 btrfs_invalidate_inodes(dest);
2399 if (dest->cache_inode) {
2400 iput(dest->cache_inode);
2401 dest->cache_inode = NULL;
2407 mutex_unlock(&dir->i_mutex);
2409 mnt_drop_write_file(file);
2415 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2417 struct inode *inode = file_inode(file);
2418 struct btrfs_root *root = BTRFS_I(inode)->root;
2419 struct btrfs_ioctl_defrag_range_args *range;
2422 ret = mnt_want_write_file(file);
2426 if (btrfs_root_readonly(root)) {
2431 switch (inode->i_mode & S_IFMT) {
2433 if (!capable(CAP_SYS_ADMIN)) {
2437 ret = btrfs_defrag_root(root);
2440 ret = btrfs_defrag_root(root->fs_info->extent_root);
2443 if (!(file->f_mode & FMODE_WRITE)) {
2448 range = kzalloc(sizeof(*range), GFP_KERNEL);
2455 if (copy_from_user(range, argp,
2461 /* compression requires us to start the IO */
2462 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2463 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2464 range->extent_thresh = (u32)-1;
2467 /* the rest are all set to zero by kzalloc */
2468 range->len = (u64)-1;
2470 ret = btrfs_defrag_file(file_inode(file), file,
2480 mnt_drop_write_file(file);
2484 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2486 struct btrfs_ioctl_vol_args *vol_args;
2489 if (!capable(CAP_SYS_ADMIN))
2492 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2494 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2497 mutex_lock(&root->fs_info->volume_mutex);
2498 vol_args = memdup_user(arg, sizeof(*vol_args));
2499 if (IS_ERR(vol_args)) {
2500 ret = PTR_ERR(vol_args);
2504 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2505 ret = btrfs_init_new_device(root, vol_args->name);
2509 mutex_unlock(&root->fs_info->volume_mutex);
2510 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2514 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2516 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2517 struct btrfs_ioctl_vol_args *vol_args;
2520 if (!capable(CAP_SYS_ADMIN))
2523 ret = mnt_want_write_file(file);
2527 vol_args = memdup_user(arg, sizeof(*vol_args));
2528 if (IS_ERR(vol_args)) {
2529 ret = PTR_ERR(vol_args);
2533 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2535 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2537 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2541 mutex_lock(&root->fs_info->volume_mutex);
2542 ret = btrfs_rm_device(root, vol_args->name);
2543 mutex_unlock(&root->fs_info->volume_mutex);
2544 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2548 mnt_drop_write_file(file);
2552 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2554 struct btrfs_ioctl_fs_info_args *fi_args;
2555 struct btrfs_device *device;
2556 struct btrfs_device *next;
2557 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2560 if (!capable(CAP_SYS_ADMIN))
2563 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2567 mutex_lock(&fs_devices->device_list_mutex);
2568 fi_args->num_devices = fs_devices->num_devices;
2569 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2571 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2572 if (device->devid > fi_args->max_id)
2573 fi_args->max_id = device->devid;
2575 mutex_unlock(&fs_devices->device_list_mutex);
2577 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2584 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2586 struct btrfs_ioctl_dev_info_args *di_args;
2587 struct btrfs_device *dev;
2588 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2590 char *s_uuid = NULL;
2592 if (!capable(CAP_SYS_ADMIN))
2595 di_args = memdup_user(arg, sizeof(*di_args));
2596 if (IS_ERR(di_args))
2597 return PTR_ERR(di_args);
2599 if (!btrfs_is_empty_uuid(di_args->uuid))
2600 s_uuid = di_args->uuid;
2602 mutex_lock(&fs_devices->device_list_mutex);
2603 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2610 di_args->devid = dev->devid;
2611 di_args->bytes_used = dev->bytes_used;
2612 di_args->total_bytes = dev->total_bytes;
2613 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2615 struct rcu_string *name;
2618 name = rcu_dereference(dev->name);
2619 strncpy(di_args->path, name->str, sizeof(di_args->path));
2621 di_args->path[sizeof(di_args->path) - 1] = 0;
2623 di_args->path[0] = '\0';
2627 mutex_unlock(&fs_devices->device_list_mutex);
2628 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2635 static struct page *extent_same_get_page(struct inode *inode, u64 off)
2639 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2641 index = off >> PAGE_CACHE_SHIFT;
2643 page = grab_cache_page(inode->i_mapping, index);
2647 if (!PageUptodate(page)) {
2648 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2652 if (!PageUptodate(page)) {
2654 page_cache_release(page);
2663 static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2665 /* do any pending delalloc/csum calc on src, one way or
2666 another, and lock file content */
2668 struct btrfs_ordered_extent *ordered;
2669 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2670 ordered = btrfs_lookup_first_ordered_extent(inode,
2673 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2674 off + len - 1, EXTENT_DELALLOC, 0, NULL))
2676 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2678 btrfs_put_ordered_extent(ordered);
2679 btrfs_wait_ordered_range(inode, off, len);
2683 static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2684 struct inode *inode2, u64 loff2, u64 len)
2686 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2687 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2689 mutex_unlock(&inode1->i_mutex);
2690 mutex_unlock(&inode2->i_mutex);
2693 static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2694 struct inode *inode2, u64 loff2, u64 len)
2696 if (inode1 < inode2) {
2697 swap(inode1, inode2);
2701 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2702 lock_extent_range(inode1, loff1, len);
2703 if (inode1 != inode2) {
2704 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2705 lock_extent_range(inode2, loff2, len);
2709 static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2710 u64 dst_loff, u64 len)
2713 struct page *src_page, *dst_page;
2714 unsigned int cmp_len = PAGE_CACHE_SIZE;
2715 void *addr, *dst_addr;
2718 if (len < PAGE_CACHE_SIZE)
2721 src_page = extent_same_get_page(src, loff);
2724 dst_page = extent_same_get_page(dst, dst_loff);
2726 page_cache_release(src_page);
2729 addr = kmap_atomic(src_page);
2730 dst_addr = kmap_atomic(dst_page);
2732 flush_dcache_page(src_page);
2733 flush_dcache_page(dst_page);
2735 if (memcmp(addr, dst_addr, cmp_len))
2736 ret = BTRFS_SAME_DATA_DIFFERS;
2738 kunmap_atomic(addr);
2739 kunmap_atomic(dst_addr);
2740 page_cache_release(src_page);
2741 page_cache_release(dst_page);
2747 dst_loff += cmp_len;
2754 static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2756 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2758 if (off + len > inode->i_size || off + len < off)
2760 /* Check that we are block aligned - btrfs_clone() requires this */
2761 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2767 static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2768 struct inode *dst, u64 dst_loff)
2773 * btrfs_clone() can't handle extents in the same file
2774 * yet. Once that works, we can drop this check and replace it
2775 * with a check for the same inode, but overlapping extents.
2780 btrfs_double_lock(src, loff, dst, dst_loff, len);
2782 ret = extent_same_check_offsets(src, loff, len);
2786 ret = extent_same_check_offsets(dst, dst_loff, len);
2790 /* don't make the dst file partly checksummed */
2791 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2792 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2797 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2799 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2802 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2807 #define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2809 static long btrfs_ioctl_file_extent_same(struct file *file,
2810 struct btrfs_ioctl_same_args __user *argp)
2812 struct btrfs_ioctl_same_args *same;
2813 struct btrfs_ioctl_same_extent_info *info;
2814 struct inode *src = file_inode(file);
2820 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2821 bool is_admin = capable(CAP_SYS_ADMIN);
2824 if (!(file->f_mode & FMODE_READ))
2827 ret = mnt_want_write_file(file);
2831 if (get_user(count, &argp->dest_count)) {
2836 size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
2838 same = memdup_user(argp, size);
2841 ret = PTR_ERR(same);
2845 off = same->logical_offset;
2849 * Limit the total length we will dedupe for each operation.
2850 * This is intended to bound the total time spent in this
2851 * ioctl to something sane.
2853 if (len > BTRFS_MAX_DEDUPE_LEN)
2854 len = BTRFS_MAX_DEDUPE_LEN;
2856 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2858 * Btrfs does not support blocksize < page_size. As a
2859 * result, btrfs_cmp_data() won't correctly handle
2860 * this situation without an update.
2867 if (S_ISDIR(src->i_mode))
2871 if (!S_ISREG(src->i_mode))
2874 /* pre-format output fields to sane values */
2875 for (i = 0; i < count; i++) {
2876 same->info[i].bytes_deduped = 0ULL;
2877 same->info[i].status = 0;
2880 for (i = 0, info = same->info; i < count; i++, info++) {
2882 struct fd dst_file = fdget(info->fd);
2883 if (!dst_file.file) {
2884 info->status = -EBADF;
2887 dst = file_inode(dst_file.file);
2889 if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
2890 info->status = -EINVAL;
2891 } else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
2892 info->status = -EXDEV;
2893 } else if (S_ISDIR(dst->i_mode)) {
2894 info->status = -EISDIR;
2895 } else if (!S_ISREG(dst->i_mode)) {
2896 info->status = -EACCES;
2898 info->status = btrfs_extent_same(src, off, len, dst,
2899 info->logical_offset);
2900 if (info->status == 0)
2901 info->bytes_deduped += len;
2906 ret = copy_to_user(argp, same, size);
2911 mnt_drop_write_file(file);
2916 * btrfs_clone() - clone a range from inode file to another
2918 * @src: Inode to clone from
2919 * @inode: Inode to clone to
2920 * @off: Offset within source to start clone from
2921 * @olen: Original length, passed by user, of range to clone
2922 * @olen_aligned: Block-aligned value of olen, extent_same uses
2923 * identical values here
2924 * @destoff: Offset within @inode to start clone
2926 static int btrfs_clone(struct inode *src, struct inode *inode,
2927 u64 off, u64 olen, u64 olen_aligned, u64 destoff)
2929 struct btrfs_root *root = BTRFS_I(inode)->root;
2930 struct btrfs_path *path = NULL;
2931 struct extent_buffer *leaf;
2932 struct btrfs_trans_handle *trans;
2934 struct btrfs_key key;
2938 u64 len = olen_aligned;
2941 buf = vmalloc(btrfs_level_size(root, 0));
2945 path = btrfs_alloc_path();
2953 key.objectid = btrfs_ino(src);
2954 key.type = BTRFS_EXTENT_DATA_KEY;
2959 * note the key will change type as we walk through the
2962 path->leave_spinning = 1;
2963 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2968 nritems = btrfs_header_nritems(path->nodes[0]);
2970 if (path->slots[0] >= nritems) {
2971 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
2976 nritems = btrfs_header_nritems(path->nodes[0]);
2978 leaf = path->nodes[0];
2979 slot = path->slots[0];
2981 btrfs_item_key_to_cpu(leaf, &key, slot);
2982 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
2983 key.objectid != btrfs_ino(src))
2986 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2987 struct btrfs_file_extent_item *extent;
2990 struct btrfs_key new_key;
2991 u64 disko = 0, diskl = 0;
2992 u64 datao = 0, datal = 0;
2996 extent = btrfs_item_ptr(leaf, slot,
2997 struct btrfs_file_extent_item);
2998 comp = btrfs_file_extent_compression(leaf, extent);
2999 type = btrfs_file_extent_type(leaf, extent);
3000 if (type == BTRFS_FILE_EXTENT_REG ||
3001 type == BTRFS_FILE_EXTENT_PREALLOC) {
3002 disko = btrfs_file_extent_disk_bytenr(leaf,
3004 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3006 datao = btrfs_file_extent_offset(leaf, extent);
3007 datal = btrfs_file_extent_num_bytes(leaf,
3009 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3010 /* take upper bound, may be compressed */
3011 datal = btrfs_file_extent_ram_bytes(leaf,
3015 if (key.offset + datal <= off ||
3016 key.offset >= off + len - 1) {
3021 size = btrfs_item_size_nr(leaf, slot);
3022 read_extent_buffer(leaf, buf,
3023 btrfs_item_ptr_offset(leaf, slot),
3026 btrfs_release_path(path);
3027 path->leave_spinning = 0;
3029 memcpy(&new_key, &key, sizeof(new_key));
3030 new_key.objectid = btrfs_ino(inode);
3031 if (off <= key.offset)
3032 new_key.offset = key.offset + destoff - off;
3034 new_key.offset = destoff;
3037 * 1 - adjusting old extent (we may have to split it)
3038 * 1 - add new extent
3041 trans = btrfs_start_transaction(root, 3);
3042 if (IS_ERR(trans)) {
3043 ret = PTR_ERR(trans);
3047 if (type == BTRFS_FILE_EXTENT_REG ||
3048 type == BTRFS_FILE_EXTENT_PREALLOC) {
3050 * a | --- range to clone ---| b
3051 * | ------------- extent ------------- |
3054 /* substract range b */
3055 if (key.offset + datal > off + len)
3056 datal = off + len - key.offset;
3058 /* substract range a */
3059 if (off > key.offset) {
3060 datao += off - key.offset;
3061 datal -= off - key.offset;
3064 ret = btrfs_drop_extents(trans, root, inode,
3066 new_key.offset + datal,
3069 if (ret != -EOPNOTSUPP)
3070 btrfs_abort_transaction(trans,
3072 btrfs_end_transaction(trans, root);
3076 ret = btrfs_insert_empty_item(trans, root, path,
3079 btrfs_abort_transaction(trans, root,
3081 btrfs_end_transaction(trans, root);
3085 leaf = path->nodes[0];
3086 slot = path->slots[0];
3087 write_extent_buffer(leaf, buf,
3088 btrfs_item_ptr_offset(leaf, slot),
3091 extent = btrfs_item_ptr(leaf, slot,
3092 struct btrfs_file_extent_item);
3094 /* disko == 0 means it's a hole */
3098 btrfs_set_file_extent_offset(leaf, extent,
3100 btrfs_set_file_extent_num_bytes(leaf, extent,
3103 inode_add_bytes(inode, datal);
3104 ret = btrfs_inc_extent_ref(trans, root,
3106 root->root_key.objectid,
3108 new_key.offset - datao,
3111 btrfs_abort_transaction(trans,
3114 btrfs_end_transaction(trans,
3120 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3123 u64 aligned_end = 0;
3125 if (off > key.offset) {
3126 skip = off - key.offset;
3127 new_key.offset += skip;
3130 if (key.offset + datal > off + len)
3131 trim = key.offset + datal - (off + len);
3133 if (comp && (skip || trim)) {
3135 btrfs_end_transaction(trans, root);
3138 size -= skip + trim;
3139 datal -= skip + trim;
3141 aligned_end = ALIGN(new_key.offset + datal,
3143 ret = btrfs_drop_extents(trans, root, inode,
3148 if (ret != -EOPNOTSUPP)
3149 btrfs_abort_transaction(trans,
3151 btrfs_end_transaction(trans, root);
3155 ret = btrfs_insert_empty_item(trans, root, path,
3158 btrfs_abort_transaction(trans, root,
3160 btrfs_end_transaction(trans, root);
3166 btrfs_file_extent_calc_inline_size(0);
3167 memmove(buf+start, buf+start+skip,
3171 leaf = path->nodes[0];
3172 slot = path->slots[0];
3173 write_extent_buffer(leaf, buf,
3174 btrfs_item_ptr_offset(leaf, slot),
3176 inode_add_bytes(inode, datal);
3179 btrfs_mark_buffer_dirty(leaf);
3180 btrfs_release_path(path);
3182 inode_inc_iversion(inode);
3183 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3186 * we round up to the block size at eof when
3187 * determining which extents to clone above,
3188 * but shouldn't round up the file size
3190 endoff = new_key.offset + datal;
3191 if (endoff > destoff+olen)
3192 endoff = destoff+olen;
3193 if (endoff > inode->i_size)
3194 btrfs_i_size_write(inode, endoff);
3196 ret = btrfs_update_inode(trans, root, inode);
3198 btrfs_abort_transaction(trans, root, ret);
3199 btrfs_end_transaction(trans, root);
3202 ret = btrfs_end_transaction(trans, root);
3204 btrfs_release_path(path);
3210 btrfs_release_path(path);
3211 btrfs_free_path(path);
3216 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3217 u64 off, u64 olen, u64 destoff)
3219 struct inode *inode = file_inode(file);
3220 struct btrfs_root *root = BTRFS_I(inode)->root;
3225 u64 bs = root->fs_info->sb->s_blocksize;
3230 * - split compressed inline extents. annoying: we need to
3231 * decompress into destination's address_space (the file offset
3232 * may change, so source mapping won't do), then recompress (or
3233 * otherwise reinsert) a subrange.
3235 * - split destination inode's inline extents. The inline extents can
3236 * be either compressed or non-compressed.
3239 /* the destination must be opened for writing */
3240 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3243 if (btrfs_root_readonly(root))
3246 ret = mnt_want_write_file(file);
3250 src_file = fdget(srcfd);
3251 if (!src_file.file) {
3253 goto out_drop_write;
3257 if (src_file.file->f_path.mnt != file->f_path.mnt)
3260 src = file_inode(src_file.file);
3266 /* the src must be open for reading */
3267 if (!(src_file.file->f_mode & FMODE_READ))
3270 /* don't make the dst file partly checksummed */
3271 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3272 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3276 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3280 if (src->i_sb != inode->i_sb)
3285 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3286 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3288 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3289 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3292 mutex_lock(&src->i_mutex);
3295 /* determine range to clone */
3297 if (off + len > src->i_size || off + len < off)
3300 olen = len = src->i_size - off;
3301 /* if we extend to eof, continue to block boundary */
3302 if (off + len == src->i_size)
3303 len = ALIGN(src->i_size, bs) - off;
3305 /* verify the end result is block aligned */
3306 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3307 !IS_ALIGNED(destoff, bs))
3310 /* verify if ranges are overlapped within the same file */
3312 if (destoff + len > off && destoff < off + len)
3316 if (destoff > inode->i_size) {
3317 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3322 /* truncate page cache pages from target inode range */
3323 truncate_inode_pages_range(&inode->i_data, destoff,
3324 PAGE_CACHE_ALIGN(destoff + len) - 1);
3326 lock_extent_range(src, off, len);
3328 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3330 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
3334 mutex_unlock(&src->i_mutex);
3335 mutex_unlock(&inode->i_mutex);
3337 mutex_unlock(&inode->i_mutex);
3338 mutex_unlock(&src->i_mutex);
3341 mutex_unlock(&src->i_mutex);
3346 mnt_drop_write_file(file);
3350 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
3352 struct btrfs_ioctl_clone_range_args args;
3354 if (copy_from_user(&args, argp, sizeof(args)))
3356 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3357 args.src_length, args.dest_offset);
3361 * there are many ways the trans_start and trans_end ioctls can lead
3362 * to deadlocks. They should only be used by applications that
3363 * basically own the machine, and have a very in depth understanding
3364 * of all the possible deadlocks and enospc problems.
3366 static long btrfs_ioctl_trans_start(struct file *file)
3368 struct inode *inode = file_inode(file);
3369 struct btrfs_root *root = BTRFS_I(inode)->root;
3370 struct btrfs_trans_handle *trans;
3374 if (!capable(CAP_SYS_ADMIN))
3378 if (file->private_data)
3382 if (btrfs_root_readonly(root))
3385 ret = mnt_want_write_file(file);
3389 atomic_inc(&root->fs_info->open_ioctl_trans);
3392 trans = btrfs_start_ioctl_transaction(root);
3396 file->private_data = trans;
3400 atomic_dec(&root->fs_info->open_ioctl_trans);
3401 mnt_drop_write_file(file);
3406 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3408 struct inode *inode = file_inode(file);
3409 struct btrfs_root *root = BTRFS_I(inode)->root;
3410 struct btrfs_root *new_root;
3411 struct btrfs_dir_item *di;
3412 struct btrfs_trans_handle *trans;
3413 struct btrfs_path *path;
3414 struct btrfs_key location;
3415 struct btrfs_disk_key disk_key;
3420 if (!capable(CAP_SYS_ADMIN))
3423 ret = mnt_want_write_file(file);
3427 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3433 objectid = BTRFS_FS_TREE_OBJECTID;
3435 location.objectid = objectid;
3436 location.type = BTRFS_ROOT_ITEM_KEY;
3437 location.offset = (u64)-1;
3439 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3440 if (IS_ERR(new_root)) {
3441 ret = PTR_ERR(new_root);
3445 path = btrfs_alloc_path();
3450 path->leave_spinning = 1;
3452 trans = btrfs_start_transaction(root, 1);
3453 if (IS_ERR(trans)) {
3454 btrfs_free_path(path);
3455 ret = PTR_ERR(trans);
3459 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
3460 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3461 dir_id, "default", 7, 1);
3462 if (IS_ERR_OR_NULL(di)) {
3463 btrfs_free_path(path);
3464 btrfs_end_transaction(trans, root);
3465 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3466 "item, this isn't going to work");
3471 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3472 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3473 btrfs_mark_buffer_dirty(path->nodes[0]);
3474 btrfs_free_path(path);
3476 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
3477 btrfs_end_transaction(trans, root);
3479 mnt_drop_write_file(file);
3483 void btrfs_get_block_group_info(struct list_head *groups_list,
3484 struct btrfs_ioctl_space_info *space)
3486 struct btrfs_block_group_cache *block_group;
3488 space->total_bytes = 0;
3489 space->used_bytes = 0;
3491 list_for_each_entry(block_group, groups_list, list) {
3492 space->flags = block_group->flags;
3493 space->total_bytes += block_group->key.offset;
3494 space->used_bytes +=
3495 btrfs_block_group_used(&block_group->item);
3499 static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
3501 struct btrfs_ioctl_space_args space_args;
3502 struct btrfs_ioctl_space_info space;
3503 struct btrfs_ioctl_space_info *dest;
3504 struct btrfs_ioctl_space_info *dest_orig;
3505 struct btrfs_ioctl_space_info __user *user_dest;
3506 struct btrfs_space_info *info;
3507 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3508 BTRFS_BLOCK_GROUP_SYSTEM,
3509 BTRFS_BLOCK_GROUP_METADATA,
3510 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3517 if (copy_from_user(&space_args,
3518 (struct btrfs_ioctl_space_args __user *)arg,
3519 sizeof(space_args)))
3522 for (i = 0; i < num_types; i++) {
3523 struct btrfs_space_info *tmp;
3527 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3529 if (tmp->flags == types[i]) {
3539 down_read(&info->groups_sem);
3540 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3541 if (!list_empty(&info->block_groups[c]))
3544 up_read(&info->groups_sem);
3548 * Global block reserve, exported as a space_info
3552 /* space_slots == 0 means they are asking for a count */
3553 if (space_args.space_slots == 0) {
3554 space_args.total_spaces = slot_count;
3558 slot_count = min_t(u64, space_args.space_slots, slot_count);
3560 alloc_size = sizeof(*dest) * slot_count;
3562 /* we generally have at most 6 or so space infos, one for each raid
3563 * level. So, a whole page should be more than enough for everyone
3565 if (alloc_size > PAGE_CACHE_SIZE)
3568 space_args.total_spaces = 0;
3569 dest = kmalloc(alloc_size, GFP_NOFS);
3574 /* now we have a buffer to copy into */
3575 for (i = 0; i < num_types; i++) {
3576 struct btrfs_space_info *tmp;
3583 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3585 if (tmp->flags == types[i]) {
3594 down_read(&info->groups_sem);
3595 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3596 if (!list_empty(&info->block_groups[c])) {
3597 btrfs_get_block_group_info(
3598 &info->block_groups[c], &space);
3599 memcpy(dest, &space, sizeof(space));
3601 space_args.total_spaces++;
3607 up_read(&info->groups_sem);
3611 * Add global block reserve
3614 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
3616 spin_lock(&block_rsv->lock);
3617 space.total_bytes = block_rsv->size;
3618 space.used_bytes = block_rsv->size - block_rsv->reserved;
3619 spin_unlock(&block_rsv->lock);
3620 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3621 memcpy(dest, &space, sizeof(space));
3622 space_args.total_spaces++;
3625 user_dest = (struct btrfs_ioctl_space_info __user *)
3626 (arg + sizeof(struct btrfs_ioctl_space_args));
3628 if (copy_to_user(user_dest, dest_orig, alloc_size))
3633 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3640 * there are many ways the trans_start and trans_end ioctls can lead
3641 * to deadlocks. They should only be used by applications that
3642 * basically own the machine, and have a very in depth understanding
3643 * of all the possible deadlocks and enospc problems.
3645 long btrfs_ioctl_trans_end(struct file *file)
3647 struct inode *inode = file_inode(file);
3648 struct btrfs_root *root = BTRFS_I(inode)->root;
3649 struct btrfs_trans_handle *trans;
3651 trans = file->private_data;
3654 file->private_data = NULL;
3656 btrfs_end_transaction(trans, root);
3658 atomic_dec(&root->fs_info->open_ioctl_trans);
3660 mnt_drop_write_file(file);
3664 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3667 struct btrfs_trans_handle *trans;
3671 trans = btrfs_attach_transaction_barrier(root);
3672 if (IS_ERR(trans)) {
3673 if (PTR_ERR(trans) != -ENOENT)
3674 return PTR_ERR(trans);
3676 /* No running transaction, don't bother */
3677 transid = root->fs_info->last_trans_committed;
3680 transid = trans->transid;
3681 ret = btrfs_commit_transaction_async(trans, root, 0);
3683 btrfs_end_transaction(trans, root);
3688 if (copy_to_user(argp, &transid, sizeof(transid)))
3693 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3699 if (copy_from_user(&transid, argp, sizeof(transid)))
3702 transid = 0; /* current trans */
3704 return btrfs_wait_for_commit(root, transid);
3707 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3709 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3710 struct btrfs_ioctl_scrub_args *sa;
3713 if (!capable(CAP_SYS_ADMIN))
3716 sa = memdup_user(arg, sizeof(*sa));
3720 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3721 ret = mnt_want_write_file(file);
3726 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
3727 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3730 if (copy_to_user(arg, sa, sizeof(*sa)))
3733 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3734 mnt_drop_write_file(file);
3740 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3742 if (!capable(CAP_SYS_ADMIN))
3745 return btrfs_scrub_cancel(root->fs_info);
3748 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3751 struct btrfs_ioctl_scrub_args *sa;
3754 if (!capable(CAP_SYS_ADMIN))
3757 sa = memdup_user(arg, sizeof(*sa));
3761 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3763 if (copy_to_user(arg, sa, sizeof(*sa)))
3770 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3773 struct btrfs_ioctl_get_dev_stats *sa;
3776 sa = memdup_user(arg, sizeof(*sa));
3780 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3785 ret = btrfs_get_dev_stats(root, sa);
3787 if (copy_to_user(arg, sa, sizeof(*sa)))
3794 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3796 struct btrfs_ioctl_dev_replace_args *p;
3799 if (!capable(CAP_SYS_ADMIN))
3802 p = memdup_user(arg, sizeof(*p));
3807 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3808 if (root->fs_info->sb->s_flags & MS_RDONLY) {
3813 &root->fs_info->mutually_exclusive_operation_running,
3815 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3817 ret = btrfs_dev_replace_start(root, p);
3819 &root->fs_info->mutually_exclusive_operation_running,
3823 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3824 btrfs_dev_replace_status(root->fs_info, p);
3827 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3828 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3835 if (copy_to_user(arg, p, sizeof(*p)))
3842 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3848 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3849 struct inode_fs_paths *ipath = NULL;
3850 struct btrfs_path *path;
3852 if (!capable(CAP_DAC_READ_SEARCH))
3855 path = btrfs_alloc_path();
3861 ipa = memdup_user(arg, sizeof(*ipa));
3868 size = min_t(u32, ipa->size, 4096);
3869 ipath = init_ipath(size, root, path);
3870 if (IS_ERR(ipath)) {
3871 ret = PTR_ERR(ipath);
3876 ret = paths_from_inode(ipa->inum, ipath);
3880 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3881 rel_ptr = ipath->fspath->val[i] -
3882 (u64)(unsigned long)ipath->fspath->val;
3883 ipath->fspath->val[i] = rel_ptr;
3886 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3887 (void *)(unsigned long)ipath->fspath, size);
3894 btrfs_free_path(path);
3901 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3903 struct btrfs_data_container *inodes = ctx;
3904 const size_t c = 3 * sizeof(u64);
3906 if (inodes->bytes_left >= c) {
3907 inodes->bytes_left -= c;
3908 inodes->val[inodes->elem_cnt] = inum;
3909 inodes->val[inodes->elem_cnt + 1] = offset;
3910 inodes->val[inodes->elem_cnt + 2] = root;
3911 inodes->elem_cnt += 3;
3913 inodes->bytes_missing += c - inodes->bytes_left;
3914 inodes->bytes_left = 0;
3915 inodes->elem_missed += 3;
3921 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3926 struct btrfs_ioctl_logical_ino_args *loi;
3927 struct btrfs_data_container *inodes = NULL;
3928 struct btrfs_path *path = NULL;
3930 if (!capable(CAP_SYS_ADMIN))
3933 loi = memdup_user(arg, sizeof(*loi));
3940 path = btrfs_alloc_path();
3946 size = min_t(u32, loi->size, 64 * 1024);
3947 inodes = init_data_container(size);
3948 if (IS_ERR(inodes)) {
3949 ret = PTR_ERR(inodes);
3954 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3955 build_ino_list, inodes);
3961 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3962 (void *)(unsigned long)inodes, size);
3967 btrfs_free_path(path);
3974 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3975 struct btrfs_ioctl_balance_args *bargs)
3977 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3979 bargs->flags = bctl->flags;
3981 if (atomic_read(&fs_info->balance_running))
3982 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3983 if (atomic_read(&fs_info->balance_pause_req))
3984 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3985 if (atomic_read(&fs_info->balance_cancel_req))
3986 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3988 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3989 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3990 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3993 spin_lock(&fs_info->balance_lock);
3994 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3995 spin_unlock(&fs_info->balance_lock);
3997 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4001 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4003 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4004 struct btrfs_fs_info *fs_info = root->fs_info;
4005 struct btrfs_ioctl_balance_args *bargs;
4006 struct btrfs_balance_control *bctl;
4007 bool need_unlock; /* for mut. excl. ops lock */
4010 if (!capable(CAP_SYS_ADMIN))
4013 ret = mnt_want_write_file(file);
4018 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4019 mutex_lock(&fs_info->volume_mutex);
4020 mutex_lock(&fs_info->balance_mutex);
4026 * mut. excl. ops lock is locked. Three possibilites:
4027 * (1) some other op is running
4028 * (2) balance is running
4029 * (3) balance is paused -- special case (think resume)
4031 mutex_lock(&fs_info->balance_mutex);
4032 if (fs_info->balance_ctl) {
4033 /* this is either (2) or (3) */
4034 if (!atomic_read(&fs_info->balance_running)) {
4035 mutex_unlock(&fs_info->balance_mutex);
4036 if (!mutex_trylock(&fs_info->volume_mutex))
4038 mutex_lock(&fs_info->balance_mutex);
4040 if (fs_info->balance_ctl &&
4041 !atomic_read(&fs_info->balance_running)) {
4043 need_unlock = false;
4047 mutex_unlock(&fs_info->balance_mutex);
4048 mutex_unlock(&fs_info->volume_mutex);
4052 mutex_unlock(&fs_info->balance_mutex);
4058 mutex_unlock(&fs_info->balance_mutex);
4059 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4064 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4067 bargs = memdup_user(arg, sizeof(*bargs));
4068 if (IS_ERR(bargs)) {
4069 ret = PTR_ERR(bargs);
4073 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4074 if (!fs_info->balance_ctl) {
4079 bctl = fs_info->balance_ctl;
4080 spin_lock(&fs_info->balance_lock);
4081 bctl->flags |= BTRFS_BALANCE_RESUME;
4082 spin_unlock(&fs_info->balance_lock);
4090 if (fs_info->balance_ctl) {
4095 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
4101 bctl->fs_info = fs_info;
4103 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4104 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4105 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4107 bctl->flags = bargs->flags;
4109 /* balance everything - no filters */
4110 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4115 * Ownership of bctl and mutually_exclusive_operation_running
4116 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4117 * or, if restriper was paused all the way until unmount, in
4118 * free_fs_info. mutually_exclusive_operation_running is
4119 * cleared in __cancel_balance.
4121 need_unlock = false;
4123 ret = btrfs_balance(bctl, bargs);
4126 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4133 mutex_unlock(&fs_info->balance_mutex);
4134 mutex_unlock(&fs_info->volume_mutex);
4136 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4138 mnt_drop_write_file(file);
4142 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4144 if (!capable(CAP_SYS_ADMIN))
4148 case BTRFS_BALANCE_CTL_PAUSE:
4149 return btrfs_pause_balance(root->fs_info);
4150 case BTRFS_BALANCE_CTL_CANCEL:
4151 return btrfs_cancel_balance(root->fs_info);
4157 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4160 struct btrfs_fs_info *fs_info = root->fs_info;
4161 struct btrfs_ioctl_balance_args *bargs;
4164 if (!capable(CAP_SYS_ADMIN))
4167 mutex_lock(&fs_info->balance_mutex);
4168 if (!fs_info->balance_ctl) {
4173 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4179 update_ioctl_balance_args(fs_info, 1, bargs);
4181 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4186 mutex_unlock(&fs_info->balance_mutex);
4190 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4192 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4193 struct btrfs_ioctl_quota_ctl_args *sa;
4194 struct btrfs_trans_handle *trans = NULL;
4198 if (!capable(CAP_SYS_ADMIN))
4201 ret = mnt_want_write_file(file);
4205 sa = memdup_user(arg, sizeof(*sa));
4211 down_write(&root->fs_info->subvol_sem);
4212 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4213 if (IS_ERR(trans)) {
4214 ret = PTR_ERR(trans);
4219 case BTRFS_QUOTA_CTL_ENABLE:
4220 ret = btrfs_quota_enable(trans, root->fs_info);
4222 case BTRFS_QUOTA_CTL_DISABLE:
4223 ret = btrfs_quota_disable(trans, root->fs_info);
4230 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4235 up_write(&root->fs_info->subvol_sem);
4237 mnt_drop_write_file(file);
4241 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4243 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4244 struct btrfs_ioctl_qgroup_assign_args *sa;
4245 struct btrfs_trans_handle *trans;
4249 if (!capable(CAP_SYS_ADMIN))
4252 ret = mnt_want_write_file(file);
4256 sa = memdup_user(arg, sizeof(*sa));
4262 trans = btrfs_join_transaction(root);
4263 if (IS_ERR(trans)) {
4264 ret = PTR_ERR(trans);
4268 /* FIXME: check if the IDs really exist */
4270 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4273 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4277 err = btrfs_end_transaction(trans, root);
4284 mnt_drop_write_file(file);
4288 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4290 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4291 struct btrfs_ioctl_qgroup_create_args *sa;
4292 struct btrfs_trans_handle *trans;
4296 if (!capable(CAP_SYS_ADMIN))
4299 ret = mnt_want_write_file(file);
4303 sa = memdup_user(arg, sizeof(*sa));
4309 if (!sa->qgroupid) {
4314 trans = btrfs_join_transaction(root);
4315 if (IS_ERR(trans)) {
4316 ret = PTR_ERR(trans);
4320 /* FIXME: check if the IDs really exist */
4322 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4325 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4328 err = btrfs_end_transaction(trans, root);
4335 mnt_drop_write_file(file);
4339 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4341 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4342 struct btrfs_ioctl_qgroup_limit_args *sa;
4343 struct btrfs_trans_handle *trans;
4348 if (!capable(CAP_SYS_ADMIN))
4351 ret = mnt_want_write_file(file);
4355 sa = memdup_user(arg, sizeof(*sa));
4361 trans = btrfs_join_transaction(root);
4362 if (IS_ERR(trans)) {
4363 ret = PTR_ERR(trans);
4367 qgroupid = sa->qgroupid;
4369 /* take the current subvol as qgroup */
4370 qgroupid = root->root_key.objectid;
4373 /* FIXME: check if the IDs really exist */
4374 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4376 err = btrfs_end_transaction(trans, root);
4383 mnt_drop_write_file(file);
4387 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4389 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4390 struct btrfs_ioctl_quota_rescan_args *qsa;
4393 if (!capable(CAP_SYS_ADMIN))
4396 ret = mnt_want_write_file(file);
4400 qsa = memdup_user(arg, sizeof(*qsa));
4411 ret = btrfs_qgroup_rescan(root->fs_info);
4416 mnt_drop_write_file(file);
4420 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4422 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4423 struct btrfs_ioctl_quota_rescan_args *qsa;
4426 if (!capable(CAP_SYS_ADMIN))
4429 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4433 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4435 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4438 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4445 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4447 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4449 if (!capable(CAP_SYS_ADMIN))
4452 return btrfs_qgroup_wait_for_completion(root->fs_info);
4455 static long _btrfs_ioctl_set_received_subvol(struct file *file,
4456 struct btrfs_ioctl_received_subvol_args *sa)
4458 struct inode *inode = file_inode(file);
4459 struct btrfs_root *root = BTRFS_I(inode)->root;
4460 struct btrfs_root_item *root_item = &root->root_item;
4461 struct btrfs_trans_handle *trans;
4462 struct timespec ct = CURRENT_TIME;
4464 int received_uuid_changed;
4466 if (!inode_owner_or_capable(inode))
4469 ret = mnt_want_write_file(file);
4473 down_write(&root->fs_info->subvol_sem);
4475 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4480 if (btrfs_root_readonly(root)) {
4487 * 2 - uuid items (received uuid + subvol uuid)
4489 trans = btrfs_start_transaction(root, 3);
4490 if (IS_ERR(trans)) {
4491 ret = PTR_ERR(trans);
4496 sa->rtransid = trans->transid;
4497 sa->rtime.sec = ct.tv_sec;
4498 sa->rtime.nsec = ct.tv_nsec;
4500 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4502 if (received_uuid_changed &&
4503 !btrfs_is_empty_uuid(root_item->received_uuid))
4504 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4505 root_item->received_uuid,
4506 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4507 root->root_key.objectid);
4508 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4509 btrfs_set_root_stransid(root_item, sa->stransid);
4510 btrfs_set_root_rtransid(root_item, sa->rtransid);
4511 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4512 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4513 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4514 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
4516 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4517 &root->root_key, &root->root_item);
4519 btrfs_end_transaction(trans, root);
4522 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4523 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4525 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4526 root->root_key.objectid);
4527 if (ret < 0 && ret != -EEXIST) {
4528 btrfs_abort_transaction(trans, root, ret);
4532 ret = btrfs_commit_transaction(trans, root);
4534 btrfs_abort_transaction(trans, root, ret);
4539 up_write(&root->fs_info->subvol_sem);
4540 mnt_drop_write_file(file);
4545 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4548 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4549 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4552 args32 = memdup_user(arg, sizeof(*args32));
4553 if (IS_ERR(args32)) {
4554 ret = PTR_ERR(args32);
4559 args64 = kmalloc(sizeof(*args64), GFP_NOFS);
4565 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4566 args64->stransid = args32->stransid;
4567 args64->rtransid = args32->rtransid;
4568 args64->stime.sec = args32->stime.sec;
4569 args64->stime.nsec = args32->stime.nsec;
4570 args64->rtime.sec = args32->rtime.sec;
4571 args64->rtime.nsec = args32->rtime.nsec;
4572 args64->flags = args32->flags;
4574 ret = _btrfs_ioctl_set_received_subvol(file, args64);
4578 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4579 args32->stransid = args64->stransid;
4580 args32->rtransid = args64->rtransid;
4581 args32->stime.sec = args64->stime.sec;
4582 args32->stime.nsec = args64->stime.nsec;
4583 args32->rtime.sec = args64->rtime.sec;
4584 args32->rtime.nsec = args64->rtime.nsec;
4585 args32->flags = args64->flags;
4587 ret = copy_to_user(arg, args32, sizeof(*args32));
4598 static long btrfs_ioctl_set_received_subvol(struct file *file,
4601 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4604 sa = memdup_user(arg, sizeof(*sa));
4611 ret = _btrfs_ioctl_set_received_subvol(file, sa);
4616 ret = copy_to_user(arg, sa, sizeof(*sa));
4625 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4627 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4630 char label[BTRFS_LABEL_SIZE];
4632 spin_lock(&root->fs_info->super_lock);
4633 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4634 spin_unlock(&root->fs_info->super_lock);
4636 len = strnlen(label, BTRFS_LABEL_SIZE);
4638 if (len == BTRFS_LABEL_SIZE) {
4639 btrfs_warn(root->fs_info,
4640 "label is too long, return the first %zu bytes", --len);
4643 ret = copy_to_user(arg, label, len);
4645 return ret ? -EFAULT : 0;
4648 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4650 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4651 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4652 struct btrfs_trans_handle *trans;
4653 char label[BTRFS_LABEL_SIZE];
4656 if (!capable(CAP_SYS_ADMIN))
4659 if (copy_from_user(label, arg, sizeof(label)))
4662 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4663 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
4664 BTRFS_LABEL_SIZE - 1);
4668 ret = mnt_want_write_file(file);
4672 trans = btrfs_start_transaction(root, 0);
4673 if (IS_ERR(trans)) {
4674 ret = PTR_ERR(trans);
4678 spin_lock(&root->fs_info->super_lock);
4679 strcpy(super_block->label, label);
4680 spin_unlock(&root->fs_info->super_lock);
4681 ret = btrfs_commit_transaction(trans, root);
4684 mnt_drop_write_file(file);
4688 #define INIT_FEATURE_FLAGS(suffix) \
4689 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4690 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4691 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4693 static int btrfs_ioctl_get_supported_features(struct file *file,
4696 static struct btrfs_ioctl_feature_flags features[3] = {
4697 INIT_FEATURE_FLAGS(SUPP),
4698 INIT_FEATURE_FLAGS(SAFE_SET),
4699 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4702 if (copy_to_user(arg, &features, sizeof(features)))
4708 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
4710 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4711 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4712 struct btrfs_ioctl_feature_flags features;
4714 features.compat_flags = btrfs_super_compat_flags(super_block);
4715 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4716 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4718 if (copy_to_user(arg, &features, sizeof(features)))
4724 static int check_feature_bits(struct btrfs_root *root,
4725 enum btrfs_feature_set set,
4726 u64 change_mask, u64 flags, u64 supported_flags,
4727 u64 safe_set, u64 safe_clear)
4729 const char *type = btrfs_feature_set_names[set];
4731 u64 disallowed, unsupported;
4732 u64 set_mask = flags & change_mask;
4733 u64 clear_mask = ~flags & change_mask;
4735 unsupported = set_mask & ~supported_flags;
4737 names = btrfs_printable_features(set, unsupported);
4739 btrfs_warn(root->fs_info,
4740 "this kernel does not support the %s feature bit%s",
4741 names, strchr(names, ',') ? "s" : "");
4744 btrfs_warn(root->fs_info,
4745 "this kernel does not support %s bits 0x%llx",
4750 disallowed = set_mask & ~safe_set;
4752 names = btrfs_printable_features(set, disallowed);
4754 btrfs_warn(root->fs_info,
4755 "can't set the %s feature bit%s while mounted",
4756 names, strchr(names, ',') ? "s" : "");
4759 btrfs_warn(root->fs_info,
4760 "can't set %s bits 0x%llx while mounted",
4765 disallowed = clear_mask & ~safe_clear;
4767 names = btrfs_printable_features(set, disallowed);
4769 btrfs_warn(root->fs_info,
4770 "can't clear the %s feature bit%s while mounted",
4771 names, strchr(names, ',') ? "s" : "");
4774 btrfs_warn(root->fs_info,
4775 "can't clear %s bits 0x%llx while mounted",
4783 #define check_feature(root, change_mask, flags, mask_base) \
4784 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
4785 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4786 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4787 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4789 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4791 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4792 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4793 struct btrfs_ioctl_feature_flags flags[2];
4794 struct btrfs_trans_handle *trans;
4798 if (!capable(CAP_SYS_ADMIN))
4801 if (copy_from_user(flags, arg, sizeof(flags)))
4805 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4806 !flags[0].incompat_flags)
4809 ret = check_feature(root, flags[0].compat_flags,
4810 flags[1].compat_flags, COMPAT);
4814 ret = check_feature(root, flags[0].compat_ro_flags,
4815 flags[1].compat_ro_flags, COMPAT_RO);
4819 ret = check_feature(root, flags[0].incompat_flags,
4820 flags[1].incompat_flags, INCOMPAT);
4824 trans = btrfs_start_transaction(root, 0);
4826 return PTR_ERR(trans);
4828 spin_lock(&root->fs_info->super_lock);
4829 newflags = btrfs_super_compat_flags(super_block);
4830 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4831 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4832 btrfs_set_super_compat_flags(super_block, newflags);
4834 newflags = btrfs_super_compat_ro_flags(super_block);
4835 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4836 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4837 btrfs_set_super_compat_ro_flags(super_block, newflags);
4839 newflags = btrfs_super_incompat_flags(super_block);
4840 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4841 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4842 btrfs_set_super_incompat_flags(super_block, newflags);
4843 spin_unlock(&root->fs_info->super_lock);
4845 return btrfs_commit_transaction(trans, root);
4848 long btrfs_ioctl(struct file *file, unsigned int
4849 cmd, unsigned long arg)
4851 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4852 void __user *argp = (void __user *)arg;
4855 case FS_IOC_GETFLAGS:
4856 return btrfs_ioctl_getflags(file, argp);
4857 case FS_IOC_SETFLAGS:
4858 return btrfs_ioctl_setflags(file, argp);
4859 case FS_IOC_GETVERSION:
4860 return btrfs_ioctl_getversion(file, argp);
4862 return btrfs_ioctl_fitrim(file, argp);
4863 case BTRFS_IOC_SNAP_CREATE:
4864 return btrfs_ioctl_snap_create(file, argp, 0);
4865 case BTRFS_IOC_SNAP_CREATE_V2:
4866 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4867 case BTRFS_IOC_SUBVOL_CREATE:
4868 return btrfs_ioctl_snap_create(file, argp, 1);
4869 case BTRFS_IOC_SUBVOL_CREATE_V2:
4870 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4871 case BTRFS_IOC_SNAP_DESTROY:
4872 return btrfs_ioctl_snap_destroy(file, argp);
4873 case BTRFS_IOC_SUBVOL_GETFLAGS:
4874 return btrfs_ioctl_subvol_getflags(file, argp);
4875 case BTRFS_IOC_SUBVOL_SETFLAGS:
4876 return btrfs_ioctl_subvol_setflags(file, argp);
4877 case BTRFS_IOC_DEFAULT_SUBVOL:
4878 return btrfs_ioctl_default_subvol(file, argp);
4879 case BTRFS_IOC_DEFRAG:
4880 return btrfs_ioctl_defrag(file, NULL);
4881 case BTRFS_IOC_DEFRAG_RANGE:
4882 return btrfs_ioctl_defrag(file, argp);
4883 case BTRFS_IOC_RESIZE:
4884 return btrfs_ioctl_resize(file, argp);
4885 case BTRFS_IOC_ADD_DEV:
4886 return btrfs_ioctl_add_dev(root, argp);
4887 case BTRFS_IOC_RM_DEV:
4888 return btrfs_ioctl_rm_dev(file, argp);
4889 case BTRFS_IOC_FS_INFO:
4890 return btrfs_ioctl_fs_info(root, argp);
4891 case BTRFS_IOC_DEV_INFO:
4892 return btrfs_ioctl_dev_info(root, argp);
4893 case BTRFS_IOC_BALANCE:
4894 return btrfs_ioctl_balance(file, NULL);
4895 case BTRFS_IOC_CLONE:
4896 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4897 case BTRFS_IOC_CLONE_RANGE:
4898 return btrfs_ioctl_clone_range(file, argp);
4899 case BTRFS_IOC_TRANS_START:
4900 return btrfs_ioctl_trans_start(file);
4901 case BTRFS_IOC_TRANS_END:
4902 return btrfs_ioctl_trans_end(file);
4903 case BTRFS_IOC_TREE_SEARCH:
4904 return btrfs_ioctl_tree_search(file, argp);
4905 case BTRFS_IOC_INO_LOOKUP:
4906 return btrfs_ioctl_ino_lookup(file, argp);
4907 case BTRFS_IOC_INO_PATHS:
4908 return btrfs_ioctl_ino_to_path(root, argp);
4909 case BTRFS_IOC_LOGICAL_INO:
4910 return btrfs_ioctl_logical_to_ino(root, argp);
4911 case BTRFS_IOC_SPACE_INFO:
4912 return btrfs_ioctl_space_info(root, argp);
4913 case BTRFS_IOC_SYNC: {
4916 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
4919 ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
4922 case BTRFS_IOC_START_SYNC:
4923 return btrfs_ioctl_start_sync(root, argp);
4924 case BTRFS_IOC_WAIT_SYNC:
4925 return btrfs_ioctl_wait_sync(root, argp);
4926 case BTRFS_IOC_SCRUB:
4927 return btrfs_ioctl_scrub(file, argp);
4928 case BTRFS_IOC_SCRUB_CANCEL:
4929 return btrfs_ioctl_scrub_cancel(root, argp);
4930 case BTRFS_IOC_SCRUB_PROGRESS:
4931 return btrfs_ioctl_scrub_progress(root, argp);
4932 case BTRFS_IOC_BALANCE_V2:
4933 return btrfs_ioctl_balance(file, argp);
4934 case BTRFS_IOC_BALANCE_CTL:
4935 return btrfs_ioctl_balance_ctl(root, arg);
4936 case BTRFS_IOC_BALANCE_PROGRESS:
4937 return btrfs_ioctl_balance_progress(root, argp);
4938 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4939 return btrfs_ioctl_set_received_subvol(file, argp);
4941 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4942 return btrfs_ioctl_set_received_subvol_32(file, argp);
4944 case BTRFS_IOC_SEND:
4945 return btrfs_ioctl_send(file, argp);
4946 case BTRFS_IOC_GET_DEV_STATS:
4947 return btrfs_ioctl_get_dev_stats(root, argp);
4948 case BTRFS_IOC_QUOTA_CTL:
4949 return btrfs_ioctl_quota_ctl(file, argp);
4950 case BTRFS_IOC_QGROUP_ASSIGN:
4951 return btrfs_ioctl_qgroup_assign(file, argp);
4952 case BTRFS_IOC_QGROUP_CREATE:
4953 return btrfs_ioctl_qgroup_create(file, argp);
4954 case BTRFS_IOC_QGROUP_LIMIT:
4955 return btrfs_ioctl_qgroup_limit(file, argp);
4956 case BTRFS_IOC_QUOTA_RESCAN:
4957 return btrfs_ioctl_quota_rescan(file, argp);
4958 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4959 return btrfs_ioctl_quota_rescan_status(file, argp);
4960 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4961 return btrfs_ioctl_quota_rescan_wait(file, argp);
4962 case BTRFS_IOC_DEV_REPLACE:
4963 return btrfs_ioctl_dev_replace(root, argp);
4964 case BTRFS_IOC_GET_FSLABEL:
4965 return btrfs_ioctl_get_fslabel(file, argp);
4966 case BTRFS_IOC_SET_FSLABEL:
4967 return btrfs_ioctl_set_fslabel(file, argp);
4968 case BTRFS_IOC_FILE_EXTENT_SAME:
4969 return btrfs_ioctl_file_extent_same(file, argp);
4970 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4971 return btrfs_ioctl_get_supported_features(file, argp);
4972 case BTRFS_IOC_GET_FEATURES:
4973 return btrfs_ioctl_get_features(file, argp);
4974 case BTRFS_IOC_SET_FEATURES:
4975 return btrfs_ioctl_set_features(file, argp);