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>
49 #include "transaction.h"
50 #include "btrfs_inode.h"
51 #include "print-tree.h"
54 #include "inode-map.h"
56 #include "rcu-string.h"
58 #include "dev-replace.h"
60 /* Mask out flags that are inappropriate for the given type of inode. */
61 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
65 else if (S_ISREG(mode))
66 return flags & ~FS_DIRSYNC_FL;
68 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
72 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
74 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
76 unsigned int iflags = 0;
78 if (flags & BTRFS_INODE_SYNC)
80 if (flags & BTRFS_INODE_IMMUTABLE)
81 iflags |= FS_IMMUTABLE_FL;
82 if (flags & BTRFS_INODE_APPEND)
83 iflags |= FS_APPEND_FL;
84 if (flags & BTRFS_INODE_NODUMP)
85 iflags |= FS_NODUMP_FL;
86 if (flags & BTRFS_INODE_NOATIME)
87 iflags |= FS_NOATIME_FL;
88 if (flags & BTRFS_INODE_DIRSYNC)
89 iflags |= FS_DIRSYNC_FL;
90 if (flags & BTRFS_INODE_NODATACOW)
91 iflags |= FS_NOCOW_FL;
93 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
94 iflags |= FS_COMPR_FL;
95 else if (flags & BTRFS_INODE_NOCOMPRESS)
96 iflags |= FS_NOCOMP_FL;
102 * Update inode->i_flags based on the btrfs internal flags.
104 void btrfs_update_iflags(struct inode *inode)
106 struct btrfs_inode *ip = BTRFS_I(inode);
108 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
110 if (ip->flags & BTRFS_INODE_SYNC)
111 inode->i_flags |= S_SYNC;
112 if (ip->flags & BTRFS_INODE_IMMUTABLE)
113 inode->i_flags |= S_IMMUTABLE;
114 if (ip->flags & BTRFS_INODE_APPEND)
115 inode->i_flags |= S_APPEND;
116 if (ip->flags & BTRFS_INODE_NOATIME)
117 inode->i_flags |= S_NOATIME;
118 if (ip->flags & BTRFS_INODE_DIRSYNC)
119 inode->i_flags |= S_DIRSYNC;
123 * Inherit flags from the parent inode.
125 * Currently only the compression flags and the cow flags are inherited.
127 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
134 flags = BTRFS_I(dir)->flags;
136 if (flags & BTRFS_INODE_NOCOMPRESS) {
137 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
138 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
139 } else if (flags & BTRFS_INODE_COMPRESS) {
140 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
141 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
144 if (flags & BTRFS_INODE_NODATACOW) {
145 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
146 if (S_ISREG(inode->i_mode))
147 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
150 btrfs_update_iflags(inode);
153 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
155 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
156 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
158 if (copy_to_user(arg, &flags, sizeof(flags)))
163 static int check_flags(unsigned int flags)
165 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
166 FS_NOATIME_FL | FS_NODUMP_FL | \
167 FS_SYNC_FL | FS_DIRSYNC_FL | \
168 FS_NOCOMP_FL | FS_COMPR_FL |
172 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
178 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
180 struct inode *inode = file_inode(file);
181 struct btrfs_inode *ip = BTRFS_I(inode);
182 struct btrfs_root *root = ip->root;
183 struct btrfs_trans_handle *trans;
184 unsigned int flags, oldflags;
187 unsigned int i_oldflags;
190 if (btrfs_root_readonly(root))
193 if (copy_from_user(&flags, arg, sizeof(flags)))
196 ret = check_flags(flags);
200 if (!inode_owner_or_capable(inode))
203 ret = mnt_want_write_file(file);
207 mutex_lock(&inode->i_mutex);
209 ip_oldflags = ip->flags;
210 i_oldflags = inode->i_flags;
211 mode = inode->i_mode;
213 flags = btrfs_mask_flags(inode->i_mode, flags);
214 oldflags = btrfs_flags_to_ioctl(ip->flags);
215 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
216 if (!capable(CAP_LINUX_IMMUTABLE)) {
222 if (flags & FS_SYNC_FL)
223 ip->flags |= BTRFS_INODE_SYNC;
225 ip->flags &= ~BTRFS_INODE_SYNC;
226 if (flags & FS_IMMUTABLE_FL)
227 ip->flags |= BTRFS_INODE_IMMUTABLE;
229 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
230 if (flags & FS_APPEND_FL)
231 ip->flags |= BTRFS_INODE_APPEND;
233 ip->flags &= ~BTRFS_INODE_APPEND;
234 if (flags & FS_NODUMP_FL)
235 ip->flags |= BTRFS_INODE_NODUMP;
237 ip->flags &= ~BTRFS_INODE_NODUMP;
238 if (flags & FS_NOATIME_FL)
239 ip->flags |= BTRFS_INODE_NOATIME;
241 ip->flags &= ~BTRFS_INODE_NOATIME;
242 if (flags & FS_DIRSYNC_FL)
243 ip->flags |= BTRFS_INODE_DIRSYNC;
245 ip->flags &= ~BTRFS_INODE_DIRSYNC;
246 if (flags & FS_NOCOW_FL) {
249 * It's safe to turn csums off here, no extents exist.
250 * Otherwise we want the flag to reflect the real COW
251 * status of the file and will not set it.
253 if (inode->i_size == 0)
254 ip->flags |= BTRFS_INODE_NODATACOW
255 | BTRFS_INODE_NODATASUM;
257 ip->flags |= BTRFS_INODE_NODATACOW;
261 * Revert back under same assuptions as above
264 if (inode->i_size == 0)
265 ip->flags &= ~(BTRFS_INODE_NODATACOW
266 | BTRFS_INODE_NODATASUM);
268 ip->flags &= ~BTRFS_INODE_NODATACOW;
273 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
274 * flag may be changed automatically if compression code won't make
277 if (flags & FS_NOCOMP_FL) {
278 ip->flags &= ~BTRFS_INODE_COMPRESS;
279 ip->flags |= BTRFS_INODE_NOCOMPRESS;
280 } else if (flags & FS_COMPR_FL) {
281 ip->flags |= BTRFS_INODE_COMPRESS;
282 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
284 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
287 trans = btrfs_start_transaction(root, 1);
289 ret = PTR_ERR(trans);
293 btrfs_update_iflags(inode);
294 inode_inc_iversion(inode);
295 inode->i_ctime = CURRENT_TIME;
296 ret = btrfs_update_inode(trans, root, inode);
298 btrfs_end_transaction(trans, root);
301 ip->flags = ip_oldflags;
302 inode->i_flags = i_oldflags;
306 mutex_unlock(&inode->i_mutex);
307 mnt_drop_write_file(file);
311 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
313 struct inode *inode = file_inode(file);
315 return put_user(inode->i_generation, arg);
318 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
320 struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
321 struct btrfs_device *device;
322 struct request_queue *q;
323 struct fstrim_range range;
324 u64 minlen = ULLONG_MAX;
326 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
329 if (!capable(CAP_SYS_ADMIN))
333 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
337 q = bdev_get_queue(device->bdev);
338 if (blk_queue_discard(q)) {
340 minlen = min((u64)q->limits.discard_granularity,
348 if (copy_from_user(&range, arg, sizeof(range)))
350 if (range.start > total_bytes ||
351 range.len < fs_info->sb->s_blocksize)
354 range.len = min(range.len, total_bytes - range.start);
355 range.minlen = max(range.minlen, minlen);
356 ret = btrfs_trim_fs(fs_info->tree_root, &range);
360 if (copy_to_user(arg, &range, sizeof(range)))
366 static noinline int create_subvol(struct inode *dir,
367 struct dentry *dentry,
368 char *name, int namelen,
370 struct btrfs_qgroup_inherit *inherit)
372 struct btrfs_trans_handle *trans;
373 struct btrfs_key key;
374 struct btrfs_root_item root_item;
375 struct btrfs_inode_item *inode_item;
376 struct extent_buffer *leaf;
377 struct btrfs_root *root = BTRFS_I(dir)->root;
378 struct btrfs_root *new_root;
379 struct btrfs_block_rsv block_rsv;
380 struct timespec cur_time = CURRENT_TIME;
384 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
389 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
393 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
395 * The same as the snapshot creation, please see the comment
396 * of create_snapshot().
398 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
399 7, &qgroup_reserved);
403 trans = btrfs_start_transaction(root, 0);
405 ret = PTR_ERR(trans);
408 trans->block_rsv = &block_rsv;
409 trans->bytes_reserved = block_rsv.size;
411 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
415 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
416 0, objectid, NULL, 0, 0, 0);
422 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
423 btrfs_set_header_bytenr(leaf, leaf->start);
424 btrfs_set_header_generation(leaf, trans->transid);
425 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
426 btrfs_set_header_owner(leaf, objectid);
428 write_extent_buffer(leaf, root->fs_info->fsid,
429 (unsigned long)btrfs_header_fsid(leaf),
431 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
432 (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
434 btrfs_mark_buffer_dirty(leaf);
436 memset(&root_item, 0, sizeof(root_item));
438 inode_item = &root_item.inode;
439 inode_item->generation = cpu_to_le64(1);
440 inode_item->size = cpu_to_le64(3);
441 inode_item->nlink = cpu_to_le32(1);
442 inode_item->nbytes = cpu_to_le64(root->leafsize);
443 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
446 root_item.byte_limit = 0;
447 inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
449 btrfs_set_root_bytenr(&root_item, leaf->start);
450 btrfs_set_root_generation(&root_item, trans->transid);
451 btrfs_set_root_level(&root_item, 0);
452 btrfs_set_root_refs(&root_item, 1);
453 btrfs_set_root_used(&root_item, leaf->len);
454 btrfs_set_root_last_snapshot(&root_item, 0);
456 btrfs_set_root_generation_v2(&root_item,
457 btrfs_root_generation(&root_item));
458 uuid_le_gen(&new_uuid);
459 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
460 root_item.otime.sec = cpu_to_le64(cur_time.tv_sec);
461 root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec);
462 root_item.ctime = root_item.otime;
463 btrfs_set_root_ctransid(&root_item, trans->transid);
464 btrfs_set_root_otransid(&root_item, trans->transid);
466 btrfs_tree_unlock(leaf);
467 free_extent_buffer(leaf);
470 btrfs_set_root_dirid(&root_item, new_dirid);
472 key.objectid = objectid;
474 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
475 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
480 key.offset = (u64)-1;
481 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
482 if (IS_ERR(new_root)) {
483 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
484 ret = PTR_ERR(new_root);
488 btrfs_record_root_in_trans(trans, new_root);
490 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
492 /* We potentially lose an unused inode item here */
493 btrfs_abort_transaction(trans, root, ret);
498 * insert the directory item
500 ret = btrfs_set_inode_index(dir, &index);
502 btrfs_abort_transaction(trans, root, ret);
506 ret = btrfs_insert_dir_item(trans, root,
507 name, namelen, dir, &key,
508 BTRFS_FT_DIR, index);
510 btrfs_abort_transaction(trans, root, ret);
514 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
515 ret = btrfs_update_inode(trans, root, dir);
518 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
519 objectid, root->root_key.objectid,
520 btrfs_ino(dir), index, name, namelen);
525 trans->block_rsv = NULL;
526 trans->bytes_reserved = 0;
528 *async_transid = trans->transid;
529 err = btrfs_commit_transaction_async(trans, root, 1);
531 err = btrfs_commit_transaction(trans, root);
533 err = btrfs_commit_transaction(trans, root);
539 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
541 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
545 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
546 struct dentry *dentry, char *name, int namelen,
547 u64 *async_transid, bool readonly,
548 struct btrfs_qgroup_inherit *inherit)
551 struct btrfs_pending_snapshot *pending_snapshot;
552 struct btrfs_trans_handle *trans;
558 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
559 if (!pending_snapshot)
562 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
563 BTRFS_BLOCK_RSV_TEMP);
565 * 1 - parent dir inode
568 * 2 - root ref/backref
569 * 1 - root of snapshot
571 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
572 &pending_snapshot->block_rsv, 7,
573 &pending_snapshot->qgroup_reserved);
577 pending_snapshot->dentry = dentry;
578 pending_snapshot->root = root;
579 pending_snapshot->readonly = readonly;
580 pending_snapshot->dir = dir;
581 pending_snapshot->inherit = inherit;
583 trans = btrfs_start_transaction(root, 0);
585 ret = PTR_ERR(trans);
589 spin_lock(&root->fs_info->trans_lock);
590 list_add(&pending_snapshot->list,
591 &trans->transaction->pending_snapshots);
592 spin_unlock(&root->fs_info->trans_lock);
594 *async_transid = trans->transid;
595 ret = btrfs_commit_transaction_async(trans,
596 root->fs_info->extent_root, 1);
598 ret = btrfs_commit_transaction(trans, root);
600 ret = btrfs_commit_transaction(trans,
601 root->fs_info->extent_root);
606 ret = pending_snapshot->error;
610 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
614 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
616 ret = PTR_ERR(inode);
620 d_instantiate(dentry, inode);
623 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
624 &pending_snapshot->block_rsv,
625 pending_snapshot->qgroup_reserved);
627 kfree(pending_snapshot);
631 /* copy of check_sticky in fs/namei.c()
632 * It's inline, so penalty for filesystems that don't use sticky bit is
635 static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
637 kuid_t fsuid = current_fsuid();
639 if (!(dir->i_mode & S_ISVTX))
641 if (uid_eq(inode->i_uid, fsuid))
643 if (uid_eq(dir->i_uid, fsuid))
645 return !capable(CAP_FOWNER);
648 /* copy of may_delete in fs/namei.c()
649 * Check whether we can remove a link victim from directory dir, check
650 * whether the type of victim is right.
651 * 1. We can't do it if dir is read-only (done in permission())
652 * 2. We should have write and exec permissions on dir
653 * 3. We can't remove anything from append-only dir
654 * 4. We can't do anything with immutable dir (done in permission())
655 * 5. If the sticky bit on dir is set we should either
656 * a. be owner of dir, or
657 * b. be owner of victim, or
658 * c. have CAP_FOWNER capability
659 * 6. If the victim is append-only or immutable we can't do antyhing with
660 * links pointing to it.
661 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
662 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
663 * 9. We can't remove a root or mountpoint.
664 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
665 * nfs_async_unlink().
668 static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
672 if (!victim->d_inode)
675 BUG_ON(victim->d_parent->d_inode != dir);
676 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
678 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
683 if (btrfs_check_sticky(dir, victim->d_inode)||
684 IS_APPEND(victim->d_inode)||
685 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
688 if (!S_ISDIR(victim->d_inode->i_mode))
692 } else if (S_ISDIR(victim->d_inode->i_mode))
696 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
701 /* copy of may_create in fs/namei.c() */
702 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
708 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
712 * Create a new subvolume below @parent. This is largely modeled after
713 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
714 * inside this filesystem so it's quite a bit simpler.
716 static noinline int btrfs_mksubvol(struct path *parent,
717 char *name, int namelen,
718 struct btrfs_root *snap_src,
719 u64 *async_transid, bool readonly,
720 struct btrfs_qgroup_inherit *inherit)
722 struct inode *dir = parent->dentry->d_inode;
723 struct dentry *dentry;
726 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
730 dentry = lookup_one_len(name, parent->dentry, namelen);
731 error = PTR_ERR(dentry);
739 error = btrfs_may_create(dir, dentry);
744 * even if this name doesn't exist, we may get hash collisions.
745 * check for them now when we can safely fail
747 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
753 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
755 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
759 error = create_snapshot(snap_src, dir, dentry, name, namelen,
760 async_transid, readonly, inherit);
762 error = create_subvol(dir, dentry, name, namelen,
763 async_transid, inherit);
766 fsnotify_mkdir(dir, dentry);
768 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
772 mutex_unlock(&dir->i_mutex);
777 * When we're defragging a range, we don't want to kick it off again
778 * if it is really just waiting for delalloc to send it down.
779 * If we find a nice big extent or delalloc range for the bytes in the
780 * file you want to defrag, we return 0 to let you know to skip this
783 static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
785 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
786 struct extent_map *em = NULL;
787 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
790 read_lock(&em_tree->lock);
791 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
792 read_unlock(&em_tree->lock);
795 end = extent_map_end(em);
797 if (end - offset > thresh)
800 /* if we already have a nice delalloc here, just stop */
802 end = count_range_bits(io_tree, &offset, offset + thresh,
803 thresh, EXTENT_DELALLOC, 1);
810 * helper function to walk through a file and find extents
811 * newer than a specific transid, and smaller than thresh.
813 * This is used by the defragging code to find new and small
816 static int find_new_extents(struct btrfs_root *root,
817 struct inode *inode, u64 newer_than,
818 u64 *off, int thresh)
820 struct btrfs_path *path;
821 struct btrfs_key min_key;
822 struct btrfs_key max_key;
823 struct extent_buffer *leaf;
824 struct btrfs_file_extent_item *extent;
827 u64 ino = btrfs_ino(inode);
829 path = btrfs_alloc_path();
833 min_key.objectid = ino;
834 min_key.type = BTRFS_EXTENT_DATA_KEY;
835 min_key.offset = *off;
837 max_key.objectid = ino;
838 max_key.type = (u8)-1;
839 max_key.offset = (u64)-1;
841 path->keep_locks = 1;
844 ret = btrfs_search_forward(root, &min_key, &max_key,
848 if (min_key.objectid != ino)
850 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
853 leaf = path->nodes[0];
854 extent = btrfs_item_ptr(leaf, path->slots[0],
855 struct btrfs_file_extent_item);
857 type = btrfs_file_extent_type(leaf, extent);
858 if (type == BTRFS_FILE_EXTENT_REG &&
859 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
860 check_defrag_in_cache(inode, min_key.offset, thresh)) {
861 *off = min_key.offset;
862 btrfs_free_path(path);
866 if (min_key.offset == (u64)-1)
870 btrfs_release_path(path);
873 btrfs_free_path(path);
877 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
879 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
880 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
881 struct extent_map *em;
882 u64 len = PAGE_CACHE_SIZE;
885 * hopefully we have this extent in the tree already, try without
886 * the full extent lock
888 read_lock(&em_tree->lock);
889 em = lookup_extent_mapping(em_tree, start, len);
890 read_unlock(&em_tree->lock);
893 /* get the big lock and read metadata off disk */
894 lock_extent(io_tree, start, start + len - 1);
895 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
896 unlock_extent(io_tree, start, start + len - 1);
905 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
907 struct extent_map *next;
910 /* this is the last extent */
911 if (em->start + em->len >= i_size_read(inode))
914 next = defrag_lookup_extent(inode, em->start + em->len);
915 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
918 free_extent_map(next);
922 static int should_defrag_range(struct inode *inode, u64 start, int thresh,
923 u64 *last_len, u64 *skip, u64 *defrag_end,
926 struct extent_map *em;
928 bool next_mergeable = true;
931 * make sure that once we start defragging an extent, we keep on
934 if (start < *defrag_end)
939 em = defrag_lookup_extent(inode, start);
943 /* this will cover holes, and inline extents */
944 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
949 next_mergeable = defrag_check_next_extent(inode, em);
952 * we hit a real extent, if it is big or the next extent is not a
953 * real extent, don't bother defragging it
955 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
956 (em->len >= thresh || !next_mergeable))
960 * last_len ends up being a counter of how many bytes we've defragged.
961 * every time we choose not to defrag an extent, we reset *last_len
962 * so that the next tiny extent will force a defrag.
964 * The end result of this is that tiny extents before a single big
965 * extent will force at least part of that big extent to be defragged.
968 *defrag_end = extent_map_end(em);
971 *skip = extent_map_end(em);
980 * it doesn't do much good to defrag one or two pages
981 * at a time. This pulls in a nice chunk of pages
984 * It also makes sure the delalloc code has enough
985 * dirty data to avoid making new small extents as part
988 * It's a good idea to start RA on this range
989 * before calling this.
991 static int cluster_pages_for_defrag(struct inode *inode,
993 unsigned long start_index,
996 unsigned long file_end;
997 u64 isize = i_size_read(inode);
1004 struct btrfs_ordered_extent *ordered;
1005 struct extent_state *cached_state = NULL;
1006 struct extent_io_tree *tree;
1007 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1009 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1010 if (!isize || start_index > file_end)
1013 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1015 ret = btrfs_delalloc_reserve_space(inode,
1016 page_cnt << PAGE_CACHE_SHIFT);
1020 tree = &BTRFS_I(inode)->io_tree;
1022 /* step one, lock all the pages */
1023 for (i = 0; i < page_cnt; i++) {
1026 page = find_or_create_page(inode->i_mapping,
1027 start_index + i, mask);
1031 page_start = page_offset(page);
1032 page_end = page_start + PAGE_CACHE_SIZE - 1;
1034 lock_extent(tree, page_start, page_end);
1035 ordered = btrfs_lookup_ordered_extent(inode,
1037 unlock_extent(tree, page_start, page_end);
1042 btrfs_start_ordered_extent(inode, ordered, 1);
1043 btrfs_put_ordered_extent(ordered);
1046 * we unlocked the page above, so we need check if
1047 * it was released or not.
1049 if (page->mapping != inode->i_mapping) {
1051 page_cache_release(page);
1056 if (!PageUptodate(page)) {
1057 btrfs_readpage(NULL, page);
1059 if (!PageUptodate(page)) {
1061 page_cache_release(page);
1067 if (page->mapping != inode->i_mapping) {
1069 page_cache_release(page);
1079 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1083 * so now we have a nice long stream of locked
1084 * and up to date pages, lets wait on them
1086 for (i = 0; i < i_done; i++)
1087 wait_on_page_writeback(pages[i]);
1089 page_start = page_offset(pages[0]);
1090 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1092 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1093 page_start, page_end - 1, 0, &cached_state);
1094 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1095 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1096 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1097 &cached_state, GFP_NOFS);
1099 if (i_done != page_cnt) {
1100 spin_lock(&BTRFS_I(inode)->lock);
1101 BTRFS_I(inode)->outstanding_extents++;
1102 spin_unlock(&BTRFS_I(inode)->lock);
1103 btrfs_delalloc_release_space(inode,
1104 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1108 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1109 &cached_state, GFP_NOFS);
1111 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1112 page_start, page_end - 1, &cached_state,
1115 for (i = 0; i < i_done; i++) {
1116 clear_page_dirty_for_io(pages[i]);
1117 ClearPageChecked(pages[i]);
1118 set_page_extent_mapped(pages[i]);
1119 set_page_dirty(pages[i]);
1120 unlock_page(pages[i]);
1121 page_cache_release(pages[i]);
1125 for (i = 0; i < i_done; i++) {
1126 unlock_page(pages[i]);
1127 page_cache_release(pages[i]);
1129 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
1134 int btrfs_defrag_file(struct inode *inode, struct file *file,
1135 struct btrfs_ioctl_defrag_range_args *range,
1136 u64 newer_than, unsigned long max_to_defrag)
1138 struct btrfs_root *root = BTRFS_I(inode)->root;
1139 struct file_ra_state *ra = NULL;
1140 unsigned long last_index;
1141 u64 isize = i_size_read(inode);
1145 u64 newer_off = range->start;
1147 unsigned long ra_index = 0;
1149 int defrag_count = 0;
1150 int compress_type = BTRFS_COMPRESS_ZLIB;
1151 int extent_thresh = range->extent_thresh;
1152 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1153 int cluster = max_cluster;
1154 u64 new_align = ~((u64)128 * 1024 - 1);
1155 struct page **pages = NULL;
1157 if (extent_thresh == 0)
1158 extent_thresh = 256 * 1024;
1160 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1161 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1163 if (range->compress_type)
1164 compress_type = range->compress_type;
1171 * if we were not given a file, allocate a readahead
1175 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1178 file_ra_state_init(ra, inode->i_mapping);
1183 pages = kmalloc(sizeof(struct page *) * max_cluster,
1190 /* find the last page to defrag */
1191 if (range->start + range->len > range->start) {
1192 last_index = min_t(u64, isize - 1,
1193 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1195 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1199 ret = find_new_extents(root, inode, newer_than,
1200 &newer_off, 64 * 1024);
1202 range->start = newer_off;
1204 * we always align our defrag to help keep
1205 * the extents in the file evenly spaced
1207 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1211 i = range->start >> PAGE_CACHE_SHIFT;
1214 max_to_defrag = last_index + 1;
1217 * make writeback starts from i, so the defrag range can be
1218 * written sequentially.
1220 if (i < inode->i_mapping->writeback_index)
1221 inode->i_mapping->writeback_index = i;
1223 while (i <= last_index && defrag_count < max_to_defrag &&
1224 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1225 PAGE_CACHE_SHIFT)) {
1227 * make sure we stop running if someone unmounts
1230 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1233 if (btrfs_defrag_cancelled(root->fs_info)) {
1234 printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
1239 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1240 extent_thresh, &last_len, &skip,
1241 &defrag_end, range->flags &
1242 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1245 * the should_defrag function tells us how much to skip
1246 * bump our counter by the suggested amount
1248 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1249 i = max(i + 1, next);
1254 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1255 PAGE_CACHE_SHIFT) - i;
1256 cluster = min(cluster, max_cluster);
1258 cluster = max_cluster;
1261 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1262 BTRFS_I(inode)->force_compress = compress_type;
1264 if (i + cluster > ra_index) {
1265 ra_index = max(i, ra_index);
1266 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1268 ra_index += max_cluster;
1271 mutex_lock(&inode->i_mutex);
1272 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1274 mutex_unlock(&inode->i_mutex);
1278 defrag_count += ret;
1279 balance_dirty_pages_ratelimited(inode->i_mapping);
1280 mutex_unlock(&inode->i_mutex);
1283 if (newer_off == (u64)-1)
1289 newer_off = max(newer_off + 1,
1290 (u64)i << PAGE_CACHE_SHIFT);
1292 ret = find_new_extents(root, inode,
1293 newer_than, &newer_off,
1296 range->start = newer_off;
1297 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1304 last_len += ret << PAGE_CACHE_SHIFT;
1312 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1313 filemap_flush(inode->i_mapping);
1315 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1316 /* the filemap_flush will queue IO into the worker threads, but
1317 * we have to make sure the IO is actually started and that
1318 * ordered extents get created before we return
1320 atomic_inc(&root->fs_info->async_submit_draining);
1321 while (atomic_read(&root->fs_info->nr_async_submits) ||
1322 atomic_read(&root->fs_info->async_delalloc_pages)) {
1323 wait_event(root->fs_info->async_submit_wait,
1324 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1325 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1327 atomic_dec(&root->fs_info->async_submit_draining);
1329 mutex_lock(&inode->i_mutex);
1330 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1331 mutex_unlock(&inode->i_mutex);
1334 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1335 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1347 static noinline int btrfs_ioctl_resize(struct file *file,
1353 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1354 struct btrfs_ioctl_vol_args *vol_args;
1355 struct btrfs_trans_handle *trans;
1356 struct btrfs_device *device = NULL;
1358 char *devstr = NULL;
1362 if (!capable(CAP_SYS_ADMIN))
1365 ret = mnt_want_write_file(file);
1369 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1371 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
1372 mnt_drop_write_file(file);
1376 mutex_lock(&root->fs_info->volume_mutex);
1377 vol_args = memdup_user(arg, sizeof(*vol_args));
1378 if (IS_ERR(vol_args)) {
1379 ret = PTR_ERR(vol_args);
1383 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1385 sizestr = vol_args->name;
1386 devstr = strchr(sizestr, ':');
1389 sizestr = devstr + 1;
1391 devstr = vol_args->name;
1392 devid = simple_strtoull(devstr, &end, 10);
1397 printk(KERN_INFO "btrfs: resizing devid %llu\n",
1398 (unsigned long long)devid);
1401 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1403 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
1404 (unsigned long long)devid);
1409 if (!device->writeable) {
1410 printk(KERN_INFO "btrfs: resizer unable to apply on "
1411 "readonly device %llu\n",
1412 (unsigned long long)devid);
1417 if (!strcmp(sizestr, "max"))
1418 new_size = device->bdev->bd_inode->i_size;
1420 if (sizestr[0] == '-') {
1423 } else if (sizestr[0] == '+') {
1427 new_size = memparse(sizestr, NULL);
1428 if (new_size == 0) {
1434 if (device->is_tgtdev_for_dev_replace) {
1439 old_size = device->total_bytes;
1442 if (new_size > old_size) {
1446 new_size = old_size - new_size;
1447 } else if (mod > 0) {
1448 new_size = old_size + new_size;
1451 if (new_size < 256 * 1024 * 1024) {
1455 if (new_size > device->bdev->bd_inode->i_size) {
1460 do_div(new_size, root->sectorsize);
1461 new_size *= root->sectorsize;
1463 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1464 rcu_str_deref(device->name),
1465 (unsigned long long)new_size);
1467 if (new_size > old_size) {
1468 trans = btrfs_start_transaction(root, 0);
1469 if (IS_ERR(trans)) {
1470 ret = PTR_ERR(trans);
1473 ret = btrfs_grow_device(trans, device, new_size);
1474 btrfs_commit_transaction(trans, root);
1475 } else if (new_size < old_size) {
1476 ret = btrfs_shrink_device(device, new_size);
1477 } /* equal, nothing need to do */
1482 mutex_unlock(&root->fs_info->volume_mutex);
1483 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1484 mnt_drop_write_file(file);
1488 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1489 char *name, unsigned long fd, int subvol,
1490 u64 *transid, bool readonly,
1491 struct btrfs_qgroup_inherit *inherit)
1496 ret = mnt_want_write_file(file);
1500 namelen = strlen(name);
1501 if (strchr(name, '/')) {
1503 goto out_drop_write;
1506 if (name[0] == '.' &&
1507 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1509 goto out_drop_write;
1513 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1514 NULL, transid, readonly, inherit);
1516 struct fd src = fdget(fd);
1517 struct inode *src_inode;
1520 goto out_drop_write;
1523 src_inode = file_inode(src.file);
1524 if (src_inode->i_sb != file_inode(file)->i_sb) {
1525 printk(KERN_INFO "btrfs: Snapshot src from "
1529 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1530 BTRFS_I(src_inode)->root,
1531 transid, readonly, inherit);
1536 mnt_drop_write_file(file);
1541 static noinline int btrfs_ioctl_snap_create(struct file *file,
1542 void __user *arg, int subvol)
1544 struct btrfs_ioctl_vol_args *vol_args;
1547 vol_args = memdup_user(arg, sizeof(*vol_args));
1548 if (IS_ERR(vol_args))
1549 return PTR_ERR(vol_args);
1550 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1552 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1553 vol_args->fd, subvol,
1560 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1561 void __user *arg, int subvol)
1563 struct btrfs_ioctl_vol_args_v2 *vol_args;
1567 bool readonly = false;
1568 struct btrfs_qgroup_inherit *inherit = NULL;
1570 vol_args = memdup_user(arg, sizeof(*vol_args));
1571 if (IS_ERR(vol_args))
1572 return PTR_ERR(vol_args);
1573 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1575 if (vol_args->flags &
1576 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1577 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1582 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1584 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1586 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1587 if (vol_args->size > PAGE_CACHE_SIZE) {
1591 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1592 if (IS_ERR(inherit)) {
1593 ret = PTR_ERR(inherit);
1598 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1599 vol_args->fd, subvol, ptr,
1602 if (ret == 0 && ptr &&
1604 offsetof(struct btrfs_ioctl_vol_args_v2,
1605 transid), ptr, sizeof(*ptr)))
1613 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1616 struct inode *inode = file_inode(file);
1617 struct btrfs_root *root = BTRFS_I(inode)->root;
1621 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1624 down_read(&root->fs_info->subvol_sem);
1625 if (btrfs_root_readonly(root))
1626 flags |= BTRFS_SUBVOL_RDONLY;
1627 up_read(&root->fs_info->subvol_sem);
1629 if (copy_to_user(arg, &flags, sizeof(flags)))
1635 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1638 struct inode *inode = file_inode(file);
1639 struct btrfs_root *root = BTRFS_I(inode)->root;
1640 struct btrfs_trans_handle *trans;
1645 ret = mnt_want_write_file(file);
1649 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1651 goto out_drop_write;
1654 if (copy_from_user(&flags, arg, sizeof(flags))) {
1656 goto out_drop_write;
1659 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1661 goto out_drop_write;
1664 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1666 goto out_drop_write;
1669 if (!inode_owner_or_capable(inode)) {
1671 goto out_drop_write;
1674 down_write(&root->fs_info->subvol_sem);
1677 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1680 root_flags = btrfs_root_flags(&root->root_item);
1681 if (flags & BTRFS_SUBVOL_RDONLY)
1682 btrfs_set_root_flags(&root->root_item,
1683 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1685 btrfs_set_root_flags(&root->root_item,
1686 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1688 trans = btrfs_start_transaction(root, 1);
1689 if (IS_ERR(trans)) {
1690 ret = PTR_ERR(trans);
1694 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1695 &root->root_key, &root->root_item);
1697 btrfs_commit_transaction(trans, root);
1700 btrfs_set_root_flags(&root->root_item, root_flags);
1702 up_write(&root->fs_info->subvol_sem);
1704 mnt_drop_write_file(file);
1710 * helper to check if the subvolume references other subvolumes
1712 static noinline int may_destroy_subvol(struct btrfs_root *root)
1714 struct btrfs_path *path;
1715 struct btrfs_key key;
1718 path = btrfs_alloc_path();
1722 key.objectid = root->root_key.objectid;
1723 key.type = BTRFS_ROOT_REF_KEY;
1724 key.offset = (u64)-1;
1726 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1733 if (path->slots[0] > 0) {
1735 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1736 if (key.objectid == root->root_key.objectid &&
1737 key.type == BTRFS_ROOT_REF_KEY)
1741 btrfs_free_path(path);
1745 static noinline int key_in_sk(struct btrfs_key *key,
1746 struct btrfs_ioctl_search_key *sk)
1748 struct btrfs_key test;
1751 test.objectid = sk->min_objectid;
1752 test.type = sk->min_type;
1753 test.offset = sk->min_offset;
1755 ret = btrfs_comp_cpu_keys(key, &test);
1759 test.objectid = sk->max_objectid;
1760 test.type = sk->max_type;
1761 test.offset = sk->max_offset;
1763 ret = btrfs_comp_cpu_keys(key, &test);
1769 static noinline int copy_to_sk(struct btrfs_root *root,
1770 struct btrfs_path *path,
1771 struct btrfs_key *key,
1772 struct btrfs_ioctl_search_key *sk,
1774 unsigned long *sk_offset,
1778 struct extent_buffer *leaf;
1779 struct btrfs_ioctl_search_header sh;
1780 unsigned long item_off;
1781 unsigned long item_len;
1787 leaf = path->nodes[0];
1788 slot = path->slots[0];
1789 nritems = btrfs_header_nritems(leaf);
1791 if (btrfs_header_generation(leaf) > sk->max_transid) {
1795 found_transid = btrfs_header_generation(leaf);
1797 for (i = slot; i < nritems; i++) {
1798 item_off = btrfs_item_ptr_offset(leaf, i);
1799 item_len = btrfs_item_size_nr(leaf, i);
1801 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1804 if (sizeof(sh) + item_len + *sk_offset >
1805 BTRFS_SEARCH_ARGS_BUFSIZE) {
1810 btrfs_item_key_to_cpu(leaf, key, i);
1811 if (!key_in_sk(key, sk))
1814 sh.objectid = key->objectid;
1815 sh.offset = key->offset;
1816 sh.type = key->type;
1818 sh.transid = found_transid;
1820 /* copy search result header */
1821 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1822 *sk_offset += sizeof(sh);
1825 char *p = buf + *sk_offset;
1827 read_extent_buffer(leaf, p,
1828 item_off, item_len);
1829 *sk_offset += item_len;
1833 if (*num_found >= sk->nr_items)
1838 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1840 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1843 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1853 static noinline int search_ioctl(struct inode *inode,
1854 struct btrfs_ioctl_search_args *args)
1856 struct btrfs_root *root;
1857 struct btrfs_key key;
1858 struct btrfs_key max_key;
1859 struct btrfs_path *path;
1860 struct btrfs_ioctl_search_key *sk = &args->key;
1861 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1864 unsigned long sk_offset = 0;
1866 path = btrfs_alloc_path();
1870 if (sk->tree_id == 0) {
1871 /* search the root of the inode that was passed */
1872 root = BTRFS_I(inode)->root;
1874 key.objectid = sk->tree_id;
1875 key.type = BTRFS_ROOT_ITEM_KEY;
1876 key.offset = (u64)-1;
1877 root = btrfs_read_fs_root_no_name(info, &key);
1879 printk(KERN_ERR "could not find root %llu\n",
1881 btrfs_free_path(path);
1886 key.objectid = sk->min_objectid;
1887 key.type = sk->min_type;
1888 key.offset = sk->min_offset;
1890 max_key.objectid = sk->max_objectid;
1891 max_key.type = sk->max_type;
1892 max_key.offset = sk->max_offset;
1894 path->keep_locks = 1;
1897 ret = btrfs_search_forward(root, &key, &max_key, path,
1904 ret = copy_to_sk(root, path, &key, sk, args->buf,
1905 &sk_offset, &num_found);
1906 btrfs_release_path(path);
1907 if (ret || num_found >= sk->nr_items)
1913 sk->nr_items = num_found;
1914 btrfs_free_path(path);
1918 static noinline int btrfs_ioctl_tree_search(struct file *file,
1921 struct btrfs_ioctl_search_args *args;
1922 struct inode *inode;
1925 if (!capable(CAP_SYS_ADMIN))
1928 args = memdup_user(argp, sizeof(*args));
1930 return PTR_ERR(args);
1932 inode = file_inode(file);
1933 ret = search_ioctl(inode, args);
1934 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1941 * Search INODE_REFs to identify path name of 'dirid' directory
1942 * in a 'tree_id' tree. and sets path name to 'name'.
1944 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1945 u64 tree_id, u64 dirid, char *name)
1947 struct btrfs_root *root;
1948 struct btrfs_key key;
1954 struct btrfs_inode_ref *iref;
1955 struct extent_buffer *l;
1956 struct btrfs_path *path;
1958 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1963 path = btrfs_alloc_path();
1967 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1969 key.objectid = tree_id;
1970 key.type = BTRFS_ROOT_ITEM_KEY;
1971 key.offset = (u64)-1;
1972 root = btrfs_read_fs_root_no_name(info, &key);
1974 printk(KERN_ERR "could not find root %llu\n", tree_id);
1979 key.objectid = dirid;
1980 key.type = BTRFS_INODE_REF_KEY;
1981 key.offset = (u64)-1;
1984 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1989 slot = path->slots[0];
1990 if (ret > 0 && slot > 0)
1992 btrfs_item_key_to_cpu(l, &key, slot);
1994 if (ret > 0 && (key.objectid != dirid ||
1995 key.type != BTRFS_INODE_REF_KEY)) {
2000 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2001 len = btrfs_inode_ref_name_len(l, iref);
2003 total_len += len + 1;
2008 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
2010 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2013 btrfs_release_path(path);
2014 key.objectid = key.offset;
2015 key.offset = (u64)-1;
2016 dirid = key.objectid;
2020 memmove(name, ptr, total_len);
2021 name[total_len]='\0';
2024 btrfs_free_path(path);
2028 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2031 struct btrfs_ioctl_ino_lookup_args *args;
2032 struct inode *inode;
2035 if (!capable(CAP_SYS_ADMIN))
2038 args = memdup_user(argp, sizeof(*args));
2040 return PTR_ERR(args);
2042 inode = file_inode(file);
2044 if (args->treeid == 0)
2045 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2047 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2048 args->treeid, args->objectid,
2051 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2058 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2061 struct dentry *parent = fdentry(file);
2062 struct dentry *dentry;
2063 struct inode *dir = parent->d_inode;
2064 struct inode *inode;
2065 struct btrfs_root *root = BTRFS_I(dir)->root;
2066 struct btrfs_root *dest = NULL;
2067 struct btrfs_ioctl_vol_args *vol_args;
2068 struct btrfs_trans_handle *trans;
2069 struct btrfs_block_rsv block_rsv;
2070 u64 qgroup_reserved;
2075 vol_args = memdup_user(arg, sizeof(*vol_args));
2076 if (IS_ERR(vol_args))
2077 return PTR_ERR(vol_args);
2079 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2080 namelen = strlen(vol_args->name);
2081 if (strchr(vol_args->name, '/') ||
2082 strncmp(vol_args->name, "..", namelen) == 0) {
2087 err = mnt_want_write_file(file);
2091 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2094 dentry = lookup_one_len(vol_args->name, parent, namelen);
2095 if (IS_ERR(dentry)) {
2096 err = PTR_ERR(dentry);
2097 goto out_unlock_dir;
2100 if (!dentry->d_inode) {
2105 inode = dentry->d_inode;
2106 dest = BTRFS_I(inode)->root;
2107 if (!capable(CAP_SYS_ADMIN)){
2109 * Regular user. Only allow this with a special mount
2110 * option, when the user has write+exec access to the
2111 * subvol root, and when rmdir(2) would have been
2114 * Note that this is _not_ check that the subvol is
2115 * empty or doesn't contain data that we wouldn't
2116 * otherwise be able to delete.
2118 * Users who want to delete empty subvols should try
2122 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2126 * Do not allow deletion if the parent dir is the same
2127 * as the dir to be deleted. That means the ioctl
2128 * must be called on the dentry referencing the root
2129 * of the subvol, not a random directory contained
2136 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2141 /* check if subvolume may be deleted by a user */
2142 err = btrfs_may_delete(dir, dentry, 1);
2146 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2151 mutex_lock(&inode->i_mutex);
2152 err = d_invalidate(dentry);
2156 down_write(&root->fs_info->subvol_sem);
2158 err = may_destroy_subvol(dest);
2162 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2164 * One for dir inode, two for dir entries, two for root
2167 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2168 5, &qgroup_reserved);
2172 trans = btrfs_start_transaction(root, 0);
2173 if (IS_ERR(trans)) {
2174 err = PTR_ERR(trans);
2177 trans->block_rsv = &block_rsv;
2178 trans->bytes_reserved = block_rsv.size;
2180 ret = btrfs_unlink_subvol(trans, root, dir,
2181 dest->root_key.objectid,
2182 dentry->d_name.name,
2183 dentry->d_name.len);
2186 btrfs_abort_transaction(trans, root, ret);
2190 btrfs_record_root_in_trans(trans, dest);
2192 memset(&dest->root_item.drop_progress, 0,
2193 sizeof(dest->root_item.drop_progress));
2194 dest->root_item.drop_level = 0;
2195 btrfs_set_root_refs(&dest->root_item, 0);
2197 if (!xchg(&dest->orphan_item_inserted, 1)) {
2198 ret = btrfs_insert_orphan_item(trans,
2199 root->fs_info->tree_root,
2200 dest->root_key.objectid);
2202 btrfs_abort_transaction(trans, root, ret);
2208 trans->block_rsv = NULL;
2209 trans->bytes_reserved = 0;
2210 ret = btrfs_end_transaction(trans, root);
2213 inode->i_flags |= S_DEAD;
2215 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2217 up_write(&root->fs_info->subvol_sem);
2219 mutex_unlock(&inode->i_mutex);
2221 shrink_dcache_sb(root->fs_info->sb);
2222 btrfs_invalidate_inodes(dest);
2226 if (dest->cache_inode) {
2227 iput(dest->cache_inode);
2228 dest->cache_inode = NULL;
2234 mutex_unlock(&dir->i_mutex);
2235 mnt_drop_write_file(file);
2241 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2243 struct inode *inode = file_inode(file);
2244 struct btrfs_root *root = BTRFS_I(inode)->root;
2245 struct btrfs_ioctl_defrag_range_args *range;
2248 ret = mnt_want_write_file(file);
2252 if (btrfs_root_readonly(root)) {
2257 switch (inode->i_mode & S_IFMT) {
2259 if (!capable(CAP_SYS_ADMIN)) {
2263 ret = btrfs_defrag_root(root);
2266 ret = btrfs_defrag_root(root->fs_info->extent_root);
2269 if (!(file->f_mode & FMODE_WRITE)) {
2274 range = kzalloc(sizeof(*range), GFP_KERNEL);
2281 if (copy_from_user(range, argp,
2287 /* compression requires us to start the IO */
2288 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2289 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2290 range->extent_thresh = (u32)-1;
2293 /* the rest are all set to zero by kzalloc */
2294 range->len = (u64)-1;
2296 ret = btrfs_defrag_file(file_inode(file), file,
2306 mnt_drop_write_file(file);
2310 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2312 struct btrfs_ioctl_vol_args *vol_args;
2315 if (!capable(CAP_SYS_ADMIN))
2318 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2320 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2324 mutex_lock(&root->fs_info->volume_mutex);
2325 vol_args = memdup_user(arg, sizeof(*vol_args));
2326 if (IS_ERR(vol_args)) {
2327 ret = PTR_ERR(vol_args);
2331 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2332 ret = btrfs_init_new_device(root, vol_args->name);
2336 mutex_unlock(&root->fs_info->volume_mutex);
2337 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2341 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2343 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2344 struct btrfs_ioctl_vol_args *vol_args;
2347 if (!capable(CAP_SYS_ADMIN))
2350 ret = mnt_want_write_file(file);
2354 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2356 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2357 mnt_drop_write_file(file);
2361 mutex_lock(&root->fs_info->volume_mutex);
2362 vol_args = memdup_user(arg, sizeof(*vol_args));
2363 if (IS_ERR(vol_args)) {
2364 ret = PTR_ERR(vol_args);
2368 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2369 ret = btrfs_rm_device(root, vol_args->name);
2373 mutex_unlock(&root->fs_info->volume_mutex);
2374 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2375 mnt_drop_write_file(file);
2379 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2381 struct btrfs_ioctl_fs_info_args *fi_args;
2382 struct btrfs_device *device;
2383 struct btrfs_device *next;
2384 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2387 if (!capable(CAP_SYS_ADMIN))
2390 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2394 fi_args->num_devices = fs_devices->num_devices;
2395 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2397 mutex_lock(&fs_devices->device_list_mutex);
2398 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2399 if (device->devid > fi_args->max_id)
2400 fi_args->max_id = device->devid;
2402 mutex_unlock(&fs_devices->device_list_mutex);
2404 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2411 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2413 struct btrfs_ioctl_dev_info_args *di_args;
2414 struct btrfs_device *dev;
2415 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2417 char *s_uuid = NULL;
2418 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2420 if (!capable(CAP_SYS_ADMIN))
2423 di_args = memdup_user(arg, sizeof(*di_args));
2424 if (IS_ERR(di_args))
2425 return PTR_ERR(di_args);
2427 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2428 s_uuid = di_args->uuid;
2430 mutex_lock(&fs_devices->device_list_mutex);
2431 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2432 mutex_unlock(&fs_devices->device_list_mutex);
2439 di_args->devid = dev->devid;
2440 di_args->bytes_used = dev->bytes_used;
2441 di_args->total_bytes = dev->total_bytes;
2442 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2444 struct rcu_string *name;
2447 name = rcu_dereference(dev->name);
2448 strncpy(di_args->path, name->str, sizeof(di_args->path));
2450 di_args->path[sizeof(di_args->path) - 1] = 0;
2452 di_args->path[0] = '\0';
2456 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2463 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2464 u64 off, u64 olen, u64 destoff)
2466 struct inode *inode = file_inode(file);
2467 struct btrfs_root *root = BTRFS_I(inode)->root;
2470 struct btrfs_trans_handle *trans;
2471 struct btrfs_path *path;
2472 struct extent_buffer *leaf;
2474 struct btrfs_key key;
2479 u64 bs = root->fs_info->sb->s_blocksize;
2483 * - split compressed inline extents. annoying: we need to
2484 * decompress into destination's address_space (the file offset
2485 * may change, so source mapping won't do), then recompress (or
2486 * otherwise reinsert) a subrange.
2487 * - allow ranges within the same file to be cloned (provided
2488 * they don't overlap)?
2491 /* the destination must be opened for writing */
2492 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
2495 if (btrfs_root_readonly(root))
2498 ret = mnt_want_write_file(file);
2502 src_file = fdget(srcfd);
2503 if (!src_file.file) {
2505 goto out_drop_write;
2509 if (src_file.file->f_path.mnt != file->f_path.mnt)
2512 src = file_inode(src_file.file);
2518 /* the src must be open for reading */
2519 if (!(src_file.file->f_mode & FMODE_READ))
2522 /* don't make the dst file partly checksummed */
2523 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2524 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2528 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2532 if (src->i_sb != inode->i_sb)
2536 buf = vmalloc(btrfs_level_size(root, 0));
2540 path = btrfs_alloc_path();
2548 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2549 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
2551 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2552 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2555 /* determine range to clone */
2557 if (off + len > src->i_size || off + len < off)
2560 olen = len = src->i_size - off;
2561 /* if we extend to eof, continue to block boundary */
2562 if (off + len == src->i_size)
2563 len = ALIGN(src->i_size, bs) - off;
2565 /* verify the end result is block aligned */
2566 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2567 !IS_ALIGNED(destoff, bs))
2570 if (destoff > inode->i_size) {
2571 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2576 /* truncate page cache pages from target inode range */
2577 truncate_inode_pages_range(&inode->i_data, destoff,
2578 PAGE_CACHE_ALIGN(destoff + len) - 1);
2580 /* do any pending delalloc/csum calc on src, one way or
2581 another, and lock file content */
2583 struct btrfs_ordered_extent *ordered;
2584 lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2585 ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
2587 !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
2588 EXTENT_DELALLOC, 0, NULL))
2590 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2592 btrfs_put_ordered_extent(ordered);
2593 btrfs_wait_ordered_range(src, off, len);
2597 key.objectid = btrfs_ino(src);
2598 key.type = BTRFS_EXTENT_DATA_KEY;
2603 * note the key will change type as we walk through the
2606 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2611 nritems = btrfs_header_nritems(path->nodes[0]);
2612 if (path->slots[0] >= nritems) {
2613 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
2618 nritems = btrfs_header_nritems(path->nodes[0]);
2620 leaf = path->nodes[0];
2621 slot = path->slots[0];
2623 btrfs_item_key_to_cpu(leaf, &key, slot);
2624 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
2625 key.objectid != btrfs_ino(src))
2628 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2629 struct btrfs_file_extent_item *extent;
2632 struct btrfs_key new_key;
2633 u64 disko = 0, diskl = 0;
2634 u64 datao = 0, datal = 0;
2638 size = btrfs_item_size_nr(leaf, slot);
2639 read_extent_buffer(leaf, buf,
2640 btrfs_item_ptr_offset(leaf, slot),
2643 extent = btrfs_item_ptr(leaf, slot,
2644 struct btrfs_file_extent_item);
2645 comp = btrfs_file_extent_compression(leaf, extent);
2646 type = btrfs_file_extent_type(leaf, extent);
2647 if (type == BTRFS_FILE_EXTENT_REG ||
2648 type == BTRFS_FILE_EXTENT_PREALLOC) {
2649 disko = btrfs_file_extent_disk_bytenr(leaf,
2651 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2653 datao = btrfs_file_extent_offset(leaf, extent);
2654 datal = btrfs_file_extent_num_bytes(leaf,
2656 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2657 /* take upper bound, may be compressed */
2658 datal = btrfs_file_extent_ram_bytes(leaf,
2661 btrfs_release_path(path);
2663 if (key.offset + datal <= off ||
2664 key.offset >= off + len - 1)
2667 memcpy(&new_key, &key, sizeof(new_key));
2668 new_key.objectid = btrfs_ino(inode);
2669 if (off <= key.offset)
2670 new_key.offset = key.offset + destoff - off;
2672 new_key.offset = destoff;
2675 * 1 - adjusting old extent (we may have to split it)
2676 * 1 - add new extent
2679 trans = btrfs_start_transaction(root, 3);
2680 if (IS_ERR(trans)) {
2681 ret = PTR_ERR(trans);
2685 if (type == BTRFS_FILE_EXTENT_REG ||
2686 type == BTRFS_FILE_EXTENT_PREALLOC) {
2688 * a | --- range to clone ---| b
2689 * | ------------- extent ------------- |
2692 /* substract range b */
2693 if (key.offset + datal > off + len)
2694 datal = off + len - key.offset;
2696 /* substract range a */
2697 if (off > key.offset) {
2698 datao += off - key.offset;
2699 datal -= off - key.offset;
2702 ret = btrfs_drop_extents(trans, root, inode,
2704 new_key.offset + datal,
2707 btrfs_abort_transaction(trans, root,
2709 btrfs_end_transaction(trans, root);
2713 ret = btrfs_insert_empty_item(trans, root, path,
2716 btrfs_abort_transaction(trans, root,
2718 btrfs_end_transaction(trans, root);
2722 leaf = path->nodes[0];
2723 slot = path->slots[0];
2724 write_extent_buffer(leaf, buf,
2725 btrfs_item_ptr_offset(leaf, slot),
2728 extent = btrfs_item_ptr(leaf, slot,
2729 struct btrfs_file_extent_item);
2731 /* disko == 0 means it's a hole */
2735 btrfs_set_file_extent_offset(leaf, extent,
2737 btrfs_set_file_extent_num_bytes(leaf, extent,
2740 inode_add_bytes(inode, datal);
2741 ret = btrfs_inc_extent_ref(trans, root,
2743 root->root_key.objectid,
2745 new_key.offset - datao,
2748 btrfs_abort_transaction(trans,
2751 btrfs_end_transaction(trans,
2757 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2760 if (off > key.offset) {
2761 skip = off - key.offset;
2762 new_key.offset += skip;
2765 if (key.offset + datal > off + len)
2766 trim = key.offset + datal - (off + len);
2768 if (comp && (skip || trim)) {
2770 btrfs_end_transaction(trans, root);
2773 size -= skip + trim;
2774 datal -= skip + trim;
2776 ret = btrfs_drop_extents(trans, root, inode,
2778 new_key.offset + datal,
2781 btrfs_abort_transaction(trans, root,
2783 btrfs_end_transaction(trans, root);
2787 ret = btrfs_insert_empty_item(trans, root, path,
2790 btrfs_abort_transaction(trans, root,
2792 btrfs_end_transaction(trans, root);
2798 btrfs_file_extent_calc_inline_size(0);
2799 memmove(buf+start, buf+start+skip,
2803 leaf = path->nodes[0];
2804 slot = path->slots[0];
2805 write_extent_buffer(leaf, buf,
2806 btrfs_item_ptr_offset(leaf, slot),
2808 inode_add_bytes(inode, datal);
2811 btrfs_mark_buffer_dirty(leaf);
2812 btrfs_release_path(path);
2814 inode_inc_iversion(inode);
2815 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2818 * we round up to the block size at eof when
2819 * determining which extents to clone above,
2820 * but shouldn't round up the file size
2822 endoff = new_key.offset + datal;
2823 if (endoff > destoff+olen)
2824 endoff = destoff+olen;
2825 if (endoff > inode->i_size)
2826 btrfs_i_size_write(inode, endoff);
2828 ret = btrfs_update_inode(trans, root, inode);
2830 btrfs_abort_transaction(trans, root, ret);
2831 btrfs_end_transaction(trans, root);
2834 ret = btrfs_end_transaction(trans, root);
2837 btrfs_release_path(path);
2842 btrfs_release_path(path);
2843 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2845 mutex_unlock(&src->i_mutex);
2846 mutex_unlock(&inode->i_mutex);
2848 btrfs_free_path(path);
2852 mnt_drop_write_file(file);
2856 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
2858 struct btrfs_ioctl_clone_range_args args;
2860 if (copy_from_user(&args, argp, sizeof(args)))
2862 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2863 args.src_length, args.dest_offset);
2867 * there are many ways the trans_start and trans_end ioctls can lead
2868 * to deadlocks. They should only be used by applications that
2869 * basically own the machine, and have a very in depth understanding
2870 * of all the possible deadlocks and enospc problems.
2872 static long btrfs_ioctl_trans_start(struct file *file)
2874 struct inode *inode = file_inode(file);
2875 struct btrfs_root *root = BTRFS_I(inode)->root;
2876 struct btrfs_trans_handle *trans;
2880 if (!capable(CAP_SYS_ADMIN))
2884 if (file->private_data)
2888 if (btrfs_root_readonly(root))
2891 ret = mnt_want_write_file(file);
2895 atomic_inc(&root->fs_info->open_ioctl_trans);
2898 trans = btrfs_start_ioctl_transaction(root);
2902 file->private_data = trans;
2906 atomic_dec(&root->fs_info->open_ioctl_trans);
2907 mnt_drop_write_file(file);
2912 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2914 struct inode *inode = file_inode(file);
2915 struct btrfs_root *root = BTRFS_I(inode)->root;
2916 struct btrfs_root *new_root;
2917 struct btrfs_dir_item *di;
2918 struct btrfs_trans_handle *trans;
2919 struct btrfs_path *path;
2920 struct btrfs_key location;
2921 struct btrfs_disk_key disk_key;
2926 if (!capable(CAP_SYS_ADMIN))
2929 ret = mnt_want_write_file(file);
2933 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2939 objectid = root->root_key.objectid;
2941 location.objectid = objectid;
2942 location.type = BTRFS_ROOT_ITEM_KEY;
2943 location.offset = (u64)-1;
2945 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
2946 if (IS_ERR(new_root)) {
2947 ret = PTR_ERR(new_root);
2951 if (btrfs_root_refs(&new_root->root_item) == 0) {
2956 path = btrfs_alloc_path();
2961 path->leave_spinning = 1;
2963 trans = btrfs_start_transaction(root, 1);
2964 if (IS_ERR(trans)) {
2965 btrfs_free_path(path);
2966 ret = PTR_ERR(trans);
2970 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
2971 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
2972 dir_id, "default", 7, 1);
2973 if (IS_ERR_OR_NULL(di)) {
2974 btrfs_free_path(path);
2975 btrfs_end_transaction(trans, root);
2976 printk(KERN_ERR "Umm, you don't have the default dir item, "
2977 "this isn't going to work\n");
2982 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2983 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2984 btrfs_mark_buffer_dirty(path->nodes[0]);
2985 btrfs_free_path(path);
2987 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
2988 btrfs_end_transaction(trans, root);
2990 mnt_drop_write_file(file);
2994 void btrfs_get_block_group_info(struct list_head *groups_list,
2995 struct btrfs_ioctl_space_info *space)
2997 struct btrfs_block_group_cache *block_group;
2999 space->total_bytes = 0;
3000 space->used_bytes = 0;
3002 list_for_each_entry(block_group, groups_list, list) {
3003 space->flags = block_group->flags;
3004 space->total_bytes += block_group->key.offset;
3005 space->used_bytes +=
3006 btrfs_block_group_used(&block_group->item);
3010 long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
3012 struct btrfs_ioctl_space_args space_args;
3013 struct btrfs_ioctl_space_info space;
3014 struct btrfs_ioctl_space_info *dest;
3015 struct btrfs_ioctl_space_info *dest_orig;
3016 struct btrfs_ioctl_space_info __user *user_dest;
3017 struct btrfs_space_info *info;
3018 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3019 BTRFS_BLOCK_GROUP_SYSTEM,
3020 BTRFS_BLOCK_GROUP_METADATA,
3021 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3028 if (copy_from_user(&space_args,
3029 (struct btrfs_ioctl_space_args __user *)arg,
3030 sizeof(space_args)))
3033 for (i = 0; i < num_types; i++) {
3034 struct btrfs_space_info *tmp;
3038 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3040 if (tmp->flags == types[i]) {
3050 down_read(&info->groups_sem);
3051 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3052 if (!list_empty(&info->block_groups[c]))
3055 up_read(&info->groups_sem);
3058 /* space_slots == 0 means they are asking for a count */
3059 if (space_args.space_slots == 0) {
3060 space_args.total_spaces = slot_count;
3064 slot_count = min_t(u64, space_args.space_slots, slot_count);
3066 alloc_size = sizeof(*dest) * slot_count;
3068 /* we generally have at most 6 or so space infos, one for each raid
3069 * level. So, a whole page should be more than enough for everyone
3071 if (alloc_size > PAGE_CACHE_SIZE)
3074 space_args.total_spaces = 0;
3075 dest = kmalloc(alloc_size, GFP_NOFS);
3080 /* now we have a buffer to copy into */
3081 for (i = 0; i < num_types; i++) {
3082 struct btrfs_space_info *tmp;
3089 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3091 if (tmp->flags == types[i]) {
3100 down_read(&info->groups_sem);
3101 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3102 if (!list_empty(&info->block_groups[c])) {
3103 btrfs_get_block_group_info(
3104 &info->block_groups[c], &space);
3105 memcpy(dest, &space, sizeof(space));
3107 space_args.total_spaces++;
3113 up_read(&info->groups_sem);
3116 user_dest = (struct btrfs_ioctl_space_info __user *)
3117 (arg + sizeof(struct btrfs_ioctl_space_args));
3119 if (copy_to_user(user_dest, dest_orig, alloc_size))
3124 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3131 * there are many ways the trans_start and trans_end ioctls can lead
3132 * to deadlocks. They should only be used by applications that
3133 * basically own the machine, and have a very in depth understanding
3134 * of all the possible deadlocks and enospc problems.
3136 long btrfs_ioctl_trans_end(struct file *file)
3138 struct inode *inode = file_inode(file);
3139 struct btrfs_root *root = BTRFS_I(inode)->root;
3140 struct btrfs_trans_handle *trans;
3142 trans = file->private_data;
3145 file->private_data = NULL;
3147 btrfs_end_transaction(trans, root);
3149 atomic_dec(&root->fs_info->open_ioctl_trans);
3151 mnt_drop_write_file(file);
3155 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3158 struct btrfs_trans_handle *trans;
3162 trans = btrfs_attach_transaction_barrier(root);
3163 if (IS_ERR(trans)) {
3164 if (PTR_ERR(trans) != -ENOENT)
3165 return PTR_ERR(trans);
3167 /* No running transaction, don't bother */
3168 transid = root->fs_info->last_trans_committed;
3171 transid = trans->transid;
3172 ret = btrfs_commit_transaction_async(trans, root, 0);
3174 btrfs_end_transaction(trans, root);
3179 if (copy_to_user(argp, &transid, sizeof(transid)))
3184 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3190 if (copy_from_user(&transid, argp, sizeof(transid)))
3193 transid = 0; /* current trans */
3195 return btrfs_wait_for_commit(root, transid);
3198 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3200 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3201 struct btrfs_ioctl_scrub_args *sa;
3204 if (!capable(CAP_SYS_ADMIN))
3207 sa = memdup_user(arg, sizeof(*sa));
3211 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3212 ret = mnt_want_write_file(file);
3217 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
3218 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3221 if (copy_to_user(arg, sa, sizeof(*sa)))
3224 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3225 mnt_drop_write_file(file);
3231 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3233 if (!capable(CAP_SYS_ADMIN))
3236 return btrfs_scrub_cancel(root->fs_info);
3239 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3242 struct btrfs_ioctl_scrub_args *sa;
3245 if (!capable(CAP_SYS_ADMIN))
3248 sa = memdup_user(arg, sizeof(*sa));
3252 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3254 if (copy_to_user(arg, sa, sizeof(*sa)))
3261 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3264 struct btrfs_ioctl_get_dev_stats *sa;
3267 sa = memdup_user(arg, sizeof(*sa));
3271 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3276 ret = btrfs_get_dev_stats(root, sa);
3278 if (copy_to_user(arg, sa, sizeof(*sa)))
3285 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3287 struct btrfs_ioctl_dev_replace_args *p;
3290 if (!capable(CAP_SYS_ADMIN))
3293 p = memdup_user(arg, sizeof(*p));
3298 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3300 &root->fs_info->mutually_exclusive_operation_running,
3302 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3305 ret = btrfs_dev_replace_start(root, p);
3307 &root->fs_info->mutually_exclusive_operation_running,
3311 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3312 btrfs_dev_replace_status(root->fs_info, p);
3315 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3316 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3323 if (copy_to_user(arg, p, sizeof(*p)))
3330 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3336 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3337 struct inode_fs_paths *ipath = NULL;
3338 struct btrfs_path *path;
3340 if (!capable(CAP_DAC_READ_SEARCH))
3343 path = btrfs_alloc_path();
3349 ipa = memdup_user(arg, sizeof(*ipa));
3356 size = min_t(u32, ipa->size, 4096);
3357 ipath = init_ipath(size, root, path);
3358 if (IS_ERR(ipath)) {
3359 ret = PTR_ERR(ipath);
3364 ret = paths_from_inode(ipa->inum, ipath);
3368 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3369 rel_ptr = ipath->fspath->val[i] -
3370 (u64)(unsigned long)ipath->fspath->val;
3371 ipath->fspath->val[i] = rel_ptr;
3374 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3375 (void *)(unsigned long)ipath->fspath, size);
3382 btrfs_free_path(path);
3389 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3391 struct btrfs_data_container *inodes = ctx;
3392 const size_t c = 3 * sizeof(u64);
3394 if (inodes->bytes_left >= c) {
3395 inodes->bytes_left -= c;
3396 inodes->val[inodes->elem_cnt] = inum;
3397 inodes->val[inodes->elem_cnt + 1] = offset;
3398 inodes->val[inodes->elem_cnt + 2] = root;
3399 inodes->elem_cnt += 3;
3401 inodes->bytes_missing += c - inodes->bytes_left;
3402 inodes->bytes_left = 0;
3403 inodes->elem_missed += 3;
3409 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3414 struct btrfs_ioctl_logical_ino_args *loi;
3415 struct btrfs_data_container *inodes = NULL;
3416 struct btrfs_path *path = NULL;
3418 if (!capable(CAP_SYS_ADMIN))
3421 loi = memdup_user(arg, sizeof(*loi));
3428 path = btrfs_alloc_path();
3434 size = min_t(u32, loi->size, 64 * 1024);
3435 inodes = init_data_container(size);
3436 if (IS_ERR(inodes)) {
3437 ret = PTR_ERR(inodes);
3442 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3443 build_ino_list, inodes);
3449 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3450 (void *)(unsigned long)inodes, size);
3455 btrfs_free_path(path);
3462 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3463 struct btrfs_ioctl_balance_args *bargs)
3465 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3467 bargs->flags = bctl->flags;
3469 if (atomic_read(&fs_info->balance_running))
3470 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3471 if (atomic_read(&fs_info->balance_pause_req))
3472 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3473 if (atomic_read(&fs_info->balance_cancel_req))
3474 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3476 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3477 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3478 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3481 spin_lock(&fs_info->balance_lock);
3482 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3483 spin_unlock(&fs_info->balance_lock);
3485 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3489 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3491 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3492 struct btrfs_fs_info *fs_info = root->fs_info;
3493 struct btrfs_ioctl_balance_args *bargs;
3494 struct btrfs_balance_control *bctl;
3495 bool need_unlock; /* for mut. excl. ops lock */
3498 if (!capable(CAP_SYS_ADMIN))
3501 ret = mnt_want_write_file(file);
3506 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
3507 mutex_lock(&fs_info->volume_mutex);
3508 mutex_lock(&fs_info->balance_mutex);
3514 * mut. excl. ops lock is locked. Three possibilites:
3515 * (1) some other op is running
3516 * (2) balance is running
3517 * (3) balance is paused -- special case (think resume)
3519 mutex_lock(&fs_info->balance_mutex);
3520 if (fs_info->balance_ctl) {
3521 /* this is either (2) or (3) */
3522 if (!atomic_read(&fs_info->balance_running)) {
3523 mutex_unlock(&fs_info->balance_mutex);
3524 if (!mutex_trylock(&fs_info->volume_mutex))
3526 mutex_lock(&fs_info->balance_mutex);
3528 if (fs_info->balance_ctl &&
3529 !atomic_read(&fs_info->balance_running)) {
3531 need_unlock = false;
3535 mutex_unlock(&fs_info->balance_mutex);
3536 mutex_unlock(&fs_info->volume_mutex);
3540 mutex_unlock(&fs_info->balance_mutex);
3546 mutex_unlock(&fs_info->balance_mutex);
3547 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3553 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
3556 bargs = memdup_user(arg, sizeof(*bargs));
3557 if (IS_ERR(bargs)) {
3558 ret = PTR_ERR(bargs);
3562 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3563 if (!fs_info->balance_ctl) {
3568 bctl = fs_info->balance_ctl;
3569 spin_lock(&fs_info->balance_lock);
3570 bctl->flags |= BTRFS_BALANCE_RESUME;
3571 spin_unlock(&fs_info->balance_lock);
3579 if (fs_info->balance_ctl) {
3584 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3590 bctl->fs_info = fs_info;
3592 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3593 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3594 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3596 bctl->flags = bargs->flags;
3598 /* balance everything - no filters */
3599 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
3604 * Ownership of bctl and mutually_exclusive_operation_running
3605 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
3606 * or, if restriper was paused all the way until unmount, in
3607 * free_fs_info. mutually_exclusive_operation_running is
3608 * cleared in __cancel_balance.
3610 need_unlock = false;
3612 ret = btrfs_balance(bctl, bargs);
3615 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3622 mutex_unlock(&fs_info->balance_mutex);
3623 mutex_unlock(&fs_info->volume_mutex);
3625 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3627 mnt_drop_write_file(file);
3631 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3633 if (!capable(CAP_SYS_ADMIN))
3637 case BTRFS_BALANCE_CTL_PAUSE:
3638 return btrfs_pause_balance(root->fs_info);
3639 case BTRFS_BALANCE_CTL_CANCEL:
3640 return btrfs_cancel_balance(root->fs_info);
3646 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3649 struct btrfs_fs_info *fs_info = root->fs_info;
3650 struct btrfs_ioctl_balance_args *bargs;
3653 if (!capable(CAP_SYS_ADMIN))
3656 mutex_lock(&fs_info->balance_mutex);
3657 if (!fs_info->balance_ctl) {
3662 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3668 update_ioctl_balance_args(fs_info, 1, bargs);
3670 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3675 mutex_unlock(&fs_info->balance_mutex);
3679 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3681 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3682 struct btrfs_ioctl_quota_ctl_args *sa;
3683 struct btrfs_trans_handle *trans = NULL;
3687 if (!capable(CAP_SYS_ADMIN))
3690 ret = mnt_want_write_file(file);
3694 sa = memdup_user(arg, sizeof(*sa));
3700 if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
3701 trans = btrfs_start_transaction(root, 2);
3702 if (IS_ERR(trans)) {
3703 ret = PTR_ERR(trans);
3709 case BTRFS_QUOTA_CTL_ENABLE:
3710 ret = btrfs_quota_enable(trans, root->fs_info);
3712 case BTRFS_QUOTA_CTL_DISABLE:
3713 ret = btrfs_quota_disable(trans, root->fs_info);
3715 case BTRFS_QUOTA_CTL_RESCAN:
3716 ret = btrfs_quota_rescan(root->fs_info);
3723 if (copy_to_user(arg, sa, sizeof(*sa)))
3727 err = btrfs_commit_transaction(trans, root);
3734 mnt_drop_write_file(file);
3738 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3740 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3741 struct btrfs_ioctl_qgroup_assign_args *sa;
3742 struct btrfs_trans_handle *trans;
3746 if (!capable(CAP_SYS_ADMIN))
3749 ret = mnt_want_write_file(file);
3753 sa = memdup_user(arg, sizeof(*sa));
3759 trans = btrfs_join_transaction(root);
3760 if (IS_ERR(trans)) {
3761 ret = PTR_ERR(trans);
3765 /* FIXME: check if the IDs really exist */
3767 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3770 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3774 err = btrfs_end_transaction(trans, root);
3781 mnt_drop_write_file(file);
3785 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3787 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3788 struct btrfs_ioctl_qgroup_create_args *sa;
3789 struct btrfs_trans_handle *trans;
3793 if (!capable(CAP_SYS_ADMIN))
3796 ret = mnt_want_write_file(file);
3800 sa = memdup_user(arg, sizeof(*sa));
3806 if (!sa->qgroupid) {
3811 trans = btrfs_join_transaction(root);
3812 if (IS_ERR(trans)) {
3813 ret = PTR_ERR(trans);
3817 /* FIXME: check if the IDs really exist */
3819 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3822 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3825 err = btrfs_end_transaction(trans, root);
3832 mnt_drop_write_file(file);
3836 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3838 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3839 struct btrfs_ioctl_qgroup_limit_args *sa;
3840 struct btrfs_trans_handle *trans;
3845 if (!capable(CAP_SYS_ADMIN))
3848 ret = mnt_want_write_file(file);
3852 sa = memdup_user(arg, sizeof(*sa));
3858 trans = btrfs_join_transaction(root);
3859 if (IS_ERR(trans)) {
3860 ret = PTR_ERR(trans);
3864 qgroupid = sa->qgroupid;
3866 /* take the current subvol as qgroup */
3867 qgroupid = root->root_key.objectid;
3870 /* FIXME: check if the IDs really exist */
3871 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3873 err = btrfs_end_transaction(trans, root);
3880 mnt_drop_write_file(file);
3884 static long btrfs_ioctl_set_received_subvol(struct file *file,
3887 struct btrfs_ioctl_received_subvol_args *sa = NULL;
3888 struct inode *inode = file_inode(file);
3889 struct btrfs_root *root = BTRFS_I(inode)->root;
3890 struct btrfs_root_item *root_item = &root->root_item;
3891 struct btrfs_trans_handle *trans;
3892 struct timespec ct = CURRENT_TIME;
3895 ret = mnt_want_write_file(file);
3899 down_write(&root->fs_info->subvol_sem);
3901 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
3906 if (btrfs_root_readonly(root)) {
3911 if (!inode_owner_or_capable(inode)) {
3916 sa = memdup_user(arg, sizeof(*sa));
3923 trans = btrfs_start_transaction(root, 1);
3924 if (IS_ERR(trans)) {
3925 ret = PTR_ERR(trans);
3930 sa->rtransid = trans->transid;
3931 sa->rtime.sec = ct.tv_sec;
3932 sa->rtime.nsec = ct.tv_nsec;
3934 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
3935 btrfs_set_root_stransid(root_item, sa->stransid);
3936 btrfs_set_root_rtransid(root_item, sa->rtransid);
3937 root_item->stime.sec = cpu_to_le64(sa->stime.sec);
3938 root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
3939 root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
3940 root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
3942 ret = btrfs_update_root(trans, root->fs_info->tree_root,
3943 &root->root_key, &root->root_item);
3945 btrfs_end_transaction(trans, root);
3949 ret = btrfs_commit_transaction(trans, root);
3954 ret = copy_to_user(arg, sa, sizeof(*sa));
3960 up_write(&root->fs_info->subvol_sem);
3961 mnt_drop_write_file(file);
3965 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
3967 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3968 const char *label = root->fs_info->super_copy->label;
3969 size_t len = strnlen(label, BTRFS_LABEL_SIZE);
3972 if (len == BTRFS_LABEL_SIZE) {
3973 pr_warn("btrfs: label is too long, return the first %zu bytes\n",
3977 mutex_lock(&root->fs_info->volume_mutex);
3978 ret = copy_to_user(arg, label, len);
3979 mutex_unlock(&root->fs_info->volume_mutex);
3981 return ret ? -EFAULT : 0;
3984 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
3986 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3987 struct btrfs_super_block *super_block = root->fs_info->super_copy;
3988 struct btrfs_trans_handle *trans;
3989 char label[BTRFS_LABEL_SIZE];
3992 if (!capable(CAP_SYS_ADMIN))
3995 if (copy_from_user(label, arg, sizeof(label)))
3998 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
3999 pr_err("btrfs: unable to set label with more than %d bytes\n",
4000 BTRFS_LABEL_SIZE - 1);
4004 ret = mnt_want_write_file(file);
4008 mutex_lock(&root->fs_info->volume_mutex);
4009 trans = btrfs_start_transaction(root, 0);
4010 if (IS_ERR(trans)) {
4011 ret = PTR_ERR(trans);
4015 strcpy(super_block->label, label);
4016 ret = btrfs_end_transaction(trans, root);
4019 mutex_unlock(&root->fs_info->volume_mutex);
4020 mnt_drop_write_file(file);
4024 long btrfs_ioctl(struct file *file, unsigned int
4025 cmd, unsigned long arg)
4027 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4028 void __user *argp = (void __user *)arg;
4031 case FS_IOC_GETFLAGS:
4032 return btrfs_ioctl_getflags(file, argp);
4033 case FS_IOC_SETFLAGS:
4034 return btrfs_ioctl_setflags(file, argp);
4035 case FS_IOC_GETVERSION:
4036 return btrfs_ioctl_getversion(file, argp);
4038 return btrfs_ioctl_fitrim(file, argp);
4039 case BTRFS_IOC_SNAP_CREATE:
4040 return btrfs_ioctl_snap_create(file, argp, 0);
4041 case BTRFS_IOC_SNAP_CREATE_V2:
4042 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4043 case BTRFS_IOC_SUBVOL_CREATE:
4044 return btrfs_ioctl_snap_create(file, argp, 1);
4045 case BTRFS_IOC_SUBVOL_CREATE_V2:
4046 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4047 case BTRFS_IOC_SNAP_DESTROY:
4048 return btrfs_ioctl_snap_destroy(file, argp);
4049 case BTRFS_IOC_SUBVOL_GETFLAGS:
4050 return btrfs_ioctl_subvol_getflags(file, argp);
4051 case BTRFS_IOC_SUBVOL_SETFLAGS:
4052 return btrfs_ioctl_subvol_setflags(file, argp);
4053 case BTRFS_IOC_DEFAULT_SUBVOL:
4054 return btrfs_ioctl_default_subvol(file, argp);
4055 case BTRFS_IOC_DEFRAG:
4056 return btrfs_ioctl_defrag(file, NULL);
4057 case BTRFS_IOC_DEFRAG_RANGE:
4058 return btrfs_ioctl_defrag(file, argp);
4059 case BTRFS_IOC_RESIZE:
4060 return btrfs_ioctl_resize(file, argp);
4061 case BTRFS_IOC_ADD_DEV:
4062 return btrfs_ioctl_add_dev(root, argp);
4063 case BTRFS_IOC_RM_DEV:
4064 return btrfs_ioctl_rm_dev(file, argp);
4065 case BTRFS_IOC_FS_INFO:
4066 return btrfs_ioctl_fs_info(root, argp);
4067 case BTRFS_IOC_DEV_INFO:
4068 return btrfs_ioctl_dev_info(root, argp);
4069 case BTRFS_IOC_BALANCE:
4070 return btrfs_ioctl_balance(file, NULL);
4071 case BTRFS_IOC_CLONE:
4072 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4073 case BTRFS_IOC_CLONE_RANGE:
4074 return btrfs_ioctl_clone_range(file, argp);
4075 case BTRFS_IOC_TRANS_START:
4076 return btrfs_ioctl_trans_start(file);
4077 case BTRFS_IOC_TRANS_END:
4078 return btrfs_ioctl_trans_end(file);
4079 case BTRFS_IOC_TREE_SEARCH:
4080 return btrfs_ioctl_tree_search(file, argp);
4081 case BTRFS_IOC_INO_LOOKUP:
4082 return btrfs_ioctl_ino_lookup(file, argp);
4083 case BTRFS_IOC_INO_PATHS:
4084 return btrfs_ioctl_ino_to_path(root, argp);
4085 case BTRFS_IOC_LOGICAL_INO:
4086 return btrfs_ioctl_logical_to_ino(root, argp);
4087 case BTRFS_IOC_SPACE_INFO:
4088 return btrfs_ioctl_space_info(root, argp);
4089 case BTRFS_IOC_SYNC:
4090 btrfs_sync_fs(file->f_dentry->d_sb, 1);
4092 case BTRFS_IOC_START_SYNC:
4093 return btrfs_ioctl_start_sync(root, argp);
4094 case BTRFS_IOC_WAIT_SYNC:
4095 return btrfs_ioctl_wait_sync(root, argp);
4096 case BTRFS_IOC_SCRUB:
4097 return btrfs_ioctl_scrub(file, argp);
4098 case BTRFS_IOC_SCRUB_CANCEL:
4099 return btrfs_ioctl_scrub_cancel(root, argp);
4100 case BTRFS_IOC_SCRUB_PROGRESS:
4101 return btrfs_ioctl_scrub_progress(root, argp);
4102 case BTRFS_IOC_BALANCE_V2:
4103 return btrfs_ioctl_balance(file, argp);
4104 case BTRFS_IOC_BALANCE_CTL:
4105 return btrfs_ioctl_balance_ctl(root, arg);
4106 case BTRFS_IOC_BALANCE_PROGRESS:
4107 return btrfs_ioctl_balance_progress(root, argp);
4108 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4109 return btrfs_ioctl_set_received_subvol(file, argp);
4110 case BTRFS_IOC_SEND:
4111 return btrfs_ioctl_send(file, argp);
4112 case BTRFS_IOC_GET_DEV_STATS:
4113 return btrfs_ioctl_get_dev_stats(root, argp);
4114 case BTRFS_IOC_QUOTA_CTL:
4115 return btrfs_ioctl_quota_ctl(file, argp);
4116 case BTRFS_IOC_QGROUP_ASSIGN:
4117 return btrfs_ioctl_qgroup_assign(file, argp);
4118 case BTRFS_IOC_QGROUP_CREATE:
4119 return btrfs_ioctl_qgroup_create(file, argp);
4120 case BTRFS_IOC_QGROUP_LIMIT:
4121 return btrfs_ioctl_qgroup_limit(file, argp);
4122 case BTRFS_IOC_DEV_REPLACE:
4123 return btrfs_ioctl_dev_replace(root, argp);
4124 case BTRFS_IOC_GET_FSLABEL:
4125 return btrfs_ioctl_get_fslabel(file, argp);
4126 case BTRFS_IOC_SET_FSLABEL:
4127 return btrfs_ioctl_set_fslabel(file, argp);