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);
537 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
539 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
543 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
544 struct dentry *dentry, char *name, int namelen,
545 u64 *async_transid, bool readonly,
546 struct btrfs_qgroup_inherit *inherit)
549 struct btrfs_pending_snapshot *pending_snapshot;
550 struct btrfs_trans_handle *trans;
556 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
557 if (!pending_snapshot)
560 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
561 BTRFS_BLOCK_RSV_TEMP);
563 * 1 - parent dir inode
566 * 2 - root ref/backref
567 * 1 - root of snapshot
569 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
570 &pending_snapshot->block_rsv, 7,
571 &pending_snapshot->qgroup_reserved);
575 pending_snapshot->dentry = dentry;
576 pending_snapshot->root = root;
577 pending_snapshot->readonly = readonly;
578 pending_snapshot->dir = dir;
579 pending_snapshot->inherit = inherit;
581 trans = btrfs_start_transaction(root, 0);
583 ret = PTR_ERR(trans);
587 spin_lock(&root->fs_info->trans_lock);
588 list_add(&pending_snapshot->list,
589 &trans->transaction->pending_snapshots);
590 spin_unlock(&root->fs_info->trans_lock);
592 *async_transid = trans->transid;
593 ret = btrfs_commit_transaction_async(trans,
594 root->fs_info->extent_root, 1);
596 ret = btrfs_commit_transaction(trans,
597 root->fs_info->extent_root);
600 /* cleanup_transaction has freed this for us */
602 pending_snapshot = NULL;
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 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
728 dentry = lookup_one_len(name, parent->dentry, namelen);
729 error = PTR_ERR(dentry);
737 error = btrfs_may_create(dir, dentry);
742 * even if this name doesn't exist, we may get hash collisions.
743 * check for them now when we can safely fail
745 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
751 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
753 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
757 error = create_snapshot(snap_src, dir, dentry, name, namelen,
758 async_transid, readonly, inherit);
760 error = create_subvol(dir, dentry, name, namelen,
761 async_transid, inherit);
764 fsnotify_mkdir(dir, dentry);
766 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
770 mutex_unlock(&dir->i_mutex);
775 * When we're defragging a range, we don't want to kick it off again
776 * if it is really just waiting for delalloc to send it down.
777 * If we find a nice big extent or delalloc range for the bytes in the
778 * file you want to defrag, we return 0 to let you know to skip this
781 static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
783 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
784 struct extent_map *em = NULL;
785 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
788 read_lock(&em_tree->lock);
789 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
790 read_unlock(&em_tree->lock);
793 end = extent_map_end(em);
795 if (end - offset > thresh)
798 /* if we already have a nice delalloc here, just stop */
800 end = count_range_bits(io_tree, &offset, offset + thresh,
801 thresh, EXTENT_DELALLOC, 1);
808 * helper function to walk through a file and find extents
809 * newer than a specific transid, and smaller than thresh.
811 * This is used by the defragging code to find new and small
814 static int find_new_extents(struct btrfs_root *root,
815 struct inode *inode, u64 newer_than,
816 u64 *off, int thresh)
818 struct btrfs_path *path;
819 struct btrfs_key min_key;
820 struct btrfs_key max_key;
821 struct extent_buffer *leaf;
822 struct btrfs_file_extent_item *extent;
825 u64 ino = btrfs_ino(inode);
827 path = btrfs_alloc_path();
831 min_key.objectid = ino;
832 min_key.type = BTRFS_EXTENT_DATA_KEY;
833 min_key.offset = *off;
835 max_key.objectid = ino;
836 max_key.type = (u8)-1;
837 max_key.offset = (u64)-1;
839 path->keep_locks = 1;
842 ret = btrfs_search_forward(root, &min_key, &max_key,
846 if (min_key.objectid != ino)
848 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
851 leaf = path->nodes[0];
852 extent = btrfs_item_ptr(leaf, path->slots[0],
853 struct btrfs_file_extent_item);
855 type = btrfs_file_extent_type(leaf, extent);
856 if (type == BTRFS_FILE_EXTENT_REG &&
857 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
858 check_defrag_in_cache(inode, min_key.offset, thresh)) {
859 *off = min_key.offset;
860 btrfs_free_path(path);
864 if (min_key.offset == (u64)-1)
868 btrfs_release_path(path);
871 btrfs_free_path(path);
875 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
877 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
878 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
879 struct extent_map *em;
880 u64 len = PAGE_CACHE_SIZE;
883 * hopefully we have this extent in the tree already, try without
884 * the full extent lock
886 read_lock(&em_tree->lock);
887 em = lookup_extent_mapping(em_tree, start, len);
888 read_unlock(&em_tree->lock);
891 /* get the big lock and read metadata off disk */
892 lock_extent(io_tree, start, start + len - 1);
893 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
894 unlock_extent(io_tree, start, start + len - 1);
903 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
905 struct extent_map *next;
908 /* this is the last extent */
909 if (em->start + em->len >= i_size_read(inode))
912 next = defrag_lookup_extent(inode, em->start + em->len);
913 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
916 free_extent_map(next);
920 static int should_defrag_range(struct inode *inode, u64 start, int thresh,
921 u64 *last_len, u64 *skip, u64 *defrag_end,
924 struct extent_map *em;
926 bool next_mergeable = true;
929 * make sure that once we start defragging an extent, we keep on
932 if (start < *defrag_end)
937 em = defrag_lookup_extent(inode, start);
941 /* this will cover holes, and inline extents */
942 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
947 next_mergeable = defrag_check_next_extent(inode, em);
950 * we hit a real extent, if it is big or the next extent is not a
951 * real extent, don't bother defragging it
953 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
954 (em->len >= thresh || !next_mergeable))
958 * last_len ends up being a counter of how many bytes we've defragged.
959 * every time we choose not to defrag an extent, we reset *last_len
960 * so that the next tiny extent will force a defrag.
962 * The end result of this is that tiny extents before a single big
963 * extent will force at least part of that big extent to be defragged.
966 *defrag_end = extent_map_end(em);
969 *skip = extent_map_end(em);
978 * it doesn't do much good to defrag one or two pages
979 * at a time. This pulls in a nice chunk of pages
982 * It also makes sure the delalloc code has enough
983 * dirty data to avoid making new small extents as part
986 * It's a good idea to start RA on this range
987 * before calling this.
989 static int cluster_pages_for_defrag(struct inode *inode,
991 unsigned long start_index,
994 unsigned long file_end;
995 u64 isize = i_size_read(inode);
1002 struct btrfs_ordered_extent *ordered;
1003 struct extent_state *cached_state = NULL;
1004 struct extent_io_tree *tree;
1005 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1007 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1008 if (!isize || start_index > file_end)
1011 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1013 ret = btrfs_delalloc_reserve_space(inode,
1014 page_cnt << PAGE_CACHE_SHIFT);
1018 tree = &BTRFS_I(inode)->io_tree;
1020 /* step one, lock all the pages */
1021 for (i = 0; i < page_cnt; i++) {
1024 page = find_or_create_page(inode->i_mapping,
1025 start_index + i, mask);
1029 page_start = page_offset(page);
1030 page_end = page_start + PAGE_CACHE_SIZE - 1;
1032 lock_extent(tree, page_start, page_end);
1033 ordered = btrfs_lookup_ordered_extent(inode,
1035 unlock_extent(tree, page_start, page_end);
1040 btrfs_start_ordered_extent(inode, ordered, 1);
1041 btrfs_put_ordered_extent(ordered);
1044 * we unlocked the page above, so we need check if
1045 * it was released or not.
1047 if (page->mapping != inode->i_mapping) {
1049 page_cache_release(page);
1054 if (!PageUptodate(page)) {
1055 btrfs_readpage(NULL, page);
1057 if (!PageUptodate(page)) {
1059 page_cache_release(page);
1065 if (page->mapping != inode->i_mapping) {
1067 page_cache_release(page);
1077 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1081 * so now we have a nice long stream of locked
1082 * and up to date pages, lets wait on them
1084 for (i = 0; i < i_done; i++)
1085 wait_on_page_writeback(pages[i]);
1087 page_start = page_offset(pages[0]);
1088 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1090 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1091 page_start, page_end - 1, 0, &cached_state);
1092 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1093 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1094 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1095 &cached_state, GFP_NOFS);
1097 if (i_done != page_cnt) {
1098 spin_lock(&BTRFS_I(inode)->lock);
1099 BTRFS_I(inode)->outstanding_extents++;
1100 spin_unlock(&BTRFS_I(inode)->lock);
1101 btrfs_delalloc_release_space(inode,
1102 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1106 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1107 &cached_state, GFP_NOFS);
1109 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1110 page_start, page_end - 1, &cached_state,
1113 for (i = 0; i < i_done; i++) {
1114 clear_page_dirty_for_io(pages[i]);
1115 ClearPageChecked(pages[i]);
1116 set_page_extent_mapped(pages[i]);
1117 set_page_dirty(pages[i]);
1118 unlock_page(pages[i]);
1119 page_cache_release(pages[i]);
1123 for (i = 0; i < i_done; i++) {
1124 unlock_page(pages[i]);
1125 page_cache_release(pages[i]);
1127 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
1132 int btrfs_defrag_file(struct inode *inode, struct file *file,
1133 struct btrfs_ioctl_defrag_range_args *range,
1134 u64 newer_than, unsigned long max_to_defrag)
1136 struct btrfs_root *root = BTRFS_I(inode)->root;
1137 struct file_ra_state *ra = NULL;
1138 unsigned long last_index;
1139 u64 isize = i_size_read(inode);
1143 u64 newer_off = range->start;
1145 unsigned long ra_index = 0;
1147 int defrag_count = 0;
1148 int compress_type = BTRFS_COMPRESS_ZLIB;
1149 int extent_thresh = range->extent_thresh;
1150 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1151 int cluster = max_cluster;
1152 u64 new_align = ~((u64)128 * 1024 - 1);
1153 struct page **pages = NULL;
1155 if (extent_thresh == 0)
1156 extent_thresh = 256 * 1024;
1158 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1159 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1161 if (range->compress_type)
1162 compress_type = range->compress_type;
1169 * if we were not given a file, allocate a readahead
1173 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1176 file_ra_state_init(ra, inode->i_mapping);
1181 pages = kmalloc(sizeof(struct page *) * max_cluster,
1188 /* find the last page to defrag */
1189 if (range->start + range->len > range->start) {
1190 last_index = min_t(u64, isize - 1,
1191 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1193 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1197 ret = find_new_extents(root, inode, newer_than,
1198 &newer_off, 64 * 1024);
1200 range->start = newer_off;
1202 * we always align our defrag to help keep
1203 * the extents in the file evenly spaced
1205 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1209 i = range->start >> PAGE_CACHE_SHIFT;
1212 max_to_defrag = last_index + 1;
1215 * make writeback starts from i, so the defrag range can be
1216 * written sequentially.
1218 if (i < inode->i_mapping->writeback_index)
1219 inode->i_mapping->writeback_index = i;
1221 while (i <= last_index && defrag_count < max_to_defrag &&
1222 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1223 PAGE_CACHE_SHIFT)) {
1225 * make sure we stop running if someone unmounts
1228 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1231 if (btrfs_defrag_cancelled(root->fs_info)) {
1232 printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
1237 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1238 extent_thresh, &last_len, &skip,
1239 &defrag_end, range->flags &
1240 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1243 * the should_defrag function tells us how much to skip
1244 * bump our counter by the suggested amount
1246 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1247 i = max(i + 1, next);
1252 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1253 PAGE_CACHE_SHIFT) - i;
1254 cluster = min(cluster, max_cluster);
1256 cluster = max_cluster;
1259 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1260 BTRFS_I(inode)->force_compress = compress_type;
1262 if (i + cluster > ra_index) {
1263 ra_index = max(i, ra_index);
1264 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1266 ra_index += max_cluster;
1269 mutex_lock(&inode->i_mutex);
1270 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1272 mutex_unlock(&inode->i_mutex);
1276 defrag_count += ret;
1277 balance_dirty_pages_ratelimited(inode->i_mapping);
1278 mutex_unlock(&inode->i_mutex);
1281 if (newer_off == (u64)-1)
1287 newer_off = max(newer_off + 1,
1288 (u64)i << PAGE_CACHE_SHIFT);
1290 ret = find_new_extents(root, inode,
1291 newer_than, &newer_off,
1294 range->start = newer_off;
1295 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1302 last_len += ret << PAGE_CACHE_SHIFT;
1310 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1311 filemap_flush(inode->i_mapping);
1313 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1314 /* the filemap_flush will queue IO into the worker threads, but
1315 * we have to make sure the IO is actually started and that
1316 * ordered extents get created before we return
1318 atomic_inc(&root->fs_info->async_submit_draining);
1319 while (atomic_read(&root->fs_info->nr_async_submits) ||
1320 atomic_read(&root->fs_info->async_delalloc_pages)) {
1321 wait_event(root->fs_info->async_submit_wait,
1322 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1323 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1325 atomic_dec(&root->fs_info->async_submit_draining);
1327 mutex_lock(&inode->i_mutex);
1328 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1329 mutex_unlock(&inode->i_mutex);
1332 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1333 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1345 static noinline int btrfs_ioctl_resize(struct file *file,
1351 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1352 struct btrfs_ioctl_vol_args *vol_args;
1353 struct btrfs_trans_handle *trans;
1354 struct btrfs_device *device = NULL;
1356 char *devstr = NULL;
1360 if (!capable(CAP_SYS_ADMIN))
1363 ret = mnt_want_write_file(file);
1367 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1369 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
1370 mnt_drop_write_file(file);
1374 mutex_lock(&root->fs_info->volume_mutex);
1375 vol_args = memdup_user(arg, sizeof(*vol_args));
1376 if (IS_ERR(vol_args)) {
1377 ret = PTR_ERR(vol_args);
1381 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1383 sizestr = vol_args->name;
1384 devstr = strchr(sizestr, ':');
1387 sizestr = devstr + 1;
1389 devstr = vol_args->name;
1390 devid = simple_strtoull(devstr, &end, 10);
1395 printk(KERN_INFO "btrfs: resizing devid %llu\n",
1396 (unsigned long long)devid);
1399 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1401 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
1402 (unsigned long long)devid);
1407 if (!device->writeable) {
1408 printk(KERN_INFO "btrfs: resizer unable to apply on "
1409 "readonly device %llu\n",
1410 (unsigned long long)devid);
1415 if (!strcmp(sizestr, "max"))
1416 new_size = device->bdev->bd_inode->i_size;
1418 if (sizestr[0] == '-') {
1421 } else if (sizestr[0] == '+') {
1425 new_size = memparse(sizestr, NULL);
1426 if (new_size == 0) {
1432 if (device->is_tgtdev_for_dev_replace) {
1437 old_size = device->total_bytes;
1440 if (new_size > old_size) {
1444 new_size = old_size - new_size;
1445 } else if (mod > 0) {
1446 new_size = old_size + new_size;
1449 if (new_size < 256 * 1024 * 1024) {
1453 if (new_size > device->bdev->bd_inode->i_size) {
1458 do_div(new_size, root->sectorsize);
1459 new_size *= root->sectorsize;
1461 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1462 rcu_str_deref(device->name),
1463 (unsigned long long)new_size);
1465 if (new_size > old_size) {
1466 trans = btrfs_start_transaction(root, 0);
1467 if (IS_ERR(trans)) {
1468 ret = PTR_ERR(trans);
1471 ret = btrfs_grow_device(trans, device, new_size);
1472 btrfs_commit_transaction(trans, root);
1473 } else if (new_size < old_size) {
1474 ret = btrfs_shrink_device(device, new_size);
1475 } /* equal, nothing need to do */
1480 mutex_unlock(&root->fs_info->volume_mutex);
1481 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1482 mnt_drop_write_file(file);
1486 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1487 char *name, unsigned long fd, int subvol,
1488 u64 *transid, bool readonly,
1489 struct btrfs_qgroup_inherit *inherit)
1494 ret = mnt_want_write_file(file);
1498 namelen = strlen(name);
1499 if (strchr(name, '/')) {
1501 goto out_drop_write;
1504 if (name[0] == '.' &&
1505 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1507 goto out_drop_write;
1511 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1512 NULL, transid, readonly, inherit);
1514 struct fd src = fdget(fd);
1515 struct inode *src_inode;
1518 goto out_drop_write;
1521 src_inode = file_inode(src.file);
1522 if (src_inode->i_sb != file_inode(file)->i_sb) {
1523 printk(KERN_INFO "btrfs: Snapshot src from "
1527 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1528 BTRFS_I(src_inode)->root,
1529 transid, readonly, inherit);
1534 mnt_drop_write_file(file);
1539 static noinline int btrfs_ioctl_snap_create(struct file *file,
1540 void __user *arg, int subvol)
1542 struct btrfs_ioctl_vol_args *vol_args;
1545 vol_args = memdup_user(arg, sizeof(*vol_args));
1546 if (IS_ERR(vol_args))
1547 return PTR_ERR(vol_args);
1548 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1550 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1551 vol_args->fd, subvol,
1558 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1559 void __user *arg, int subvol)
1561 struct btrfs_ioctl_vol_args_v2 *vol_args;
1565 bool readonly = false;
1566 struct btrfs_qgroup_inherit *inherit = NULL;
1568 vol_args = memdup_user(arg, sizeof(*vol_args));
1569 if (IS_ERR(vol_args))
1570 return PTR_ERR(vol_args);
1571 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1573 if (vol_args->flags &
1574 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1575 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1580 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1582 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1584 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1585 if (vol_args->size > PAGE_CACHE_SIZE) {
1589 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1590 if (IS_ERR(inherit)) {
1591 ret = PTR_ERR(inherit);
1596 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1597 vol_args->fd, subvol, ptr,
1600 if (ret == 0 && ptr &&
1602 offsetof(struct btrfs_ioctl_vol_args_v2,
1603 transid), ptr, sizeof(*ptr)))
1611 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1614 struct inode *inode = file_inode(file);
1615 struct btrfs_root *root = BTRFS_I(inode)->root;
1619 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1622 down_read(&root->fs_info->subvol_sem);
1623 if (btrfs_root_readonly(root))
1624 flags |= BTRFS_SUBVOL_RDONLY;
1625 up_read(&root->fs_info->subvol_sem);
1627 if (copy_to_user(arg, &flags, sizeof(flags)))
1633 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1636 struct inode *inode = file_inode(file);
1637 struct btrfs_root *root = BTRFS_I(inode)->root;
1638 struct btrfs_trans_handle *trans;
1643 ret = mnt_want_write_file(file);
1647 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1649 goto out_drop_write;
1652 if (copy_from_user(&flags, arg, sizeof(flags))) {
1654 goto out_drop_write;
1657 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1659 goto out_drop_write;
1662 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1664 goto out_drop_write;
1667 if (!inode_owner_or_capable(inode)) {
1669 goto out_drop_write;
1672 down_write(&root->fs_info->subvol_sem);
1675 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1678 root_flags = btrfs_root_flags(&root->root_item);
1679 if (flags & BTRFS_SUBVOL_RDONLY)
1680 btrfs_set_root_flags(&root->root_item,
1681 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1683 btrfs_set_root_flags(&root->root_item,
1684 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1686 trans = btrfs_start_transaction(root, 1);
1687 if (IS_ERR(trans)) {
1688 ret = PTR_ERR(trans);
1692 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1693 &root->root_key, &root->root_item);
1695 btrfs_commit_transaction(trans, root);
1698 btrfs_set_root_flags(&root->root_item, root_flags);
1700 up_write(&root->fs_info->subvol_sem);
1702 mnt_drop_write_file(file);
1708 * helper to check if the subvolume references other subvolumes
1710 static noinline int may_destroy_subvol(struct btrfs_root *root)
1712 struct btrfs_path *path;
1713 struct btrfs_key key;
1716 path = btrfs_alloc_path();
1720 key.objectid = root->root_key.objectid;
1721 key.type = BTRFS_ROOT_REF_KEY;
1722 key.offset = (u64)-1;
1724 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1731 if (path->slots[0] > 0) {
1733 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1734 if (key.objectid == root->root_key.objectid &&
1735 key.type == BTRFS_ROOT_REF_KEY)
1739 btrfs_free_path(path);
1743 static noinline int key_in_sk(struct btrfs_key *key,
1744 struct btrfs_ioctl_search_key *sk)
1746 struct btrfs_key test;
1749 test.objectid = sk->min_objectid;
1750 test.type = sk->min_type;
1751 test.offset = sk->min_offset;
1753 ret = btrfs_comp_cpu_keys(key, &test);
1757 test.objectid = sk->max_objectid;
1758 test.type = sk->max_type;
1759 test.offset = sk->max_offset;
1761 ret = btrfs_comp_cpu_keys(key, &test);
1767 static noinline int copy_to_sk(struct btrfs_root *root,
1768 struct btrfs_path *path,
1769 struct btrfs_key *key,
1770 struct btrfs_ioctl_search_key *sk,
1772 unsigned long *sk_offset,
1776 struct extent_buffer *leaf;
1777 struct btrfs_ioctl_search_header sh;
1778 unsigned long item_off;
1779 unsigned long item_len;
1785 leaf = path->nodes[0];
1786 slot = path->slots[0];
1787 nritems = btrfs_header_nritems(leaf);
1789 if (btrfs_header_generation(leaf) > sk->max_transid) {
1793 found_transid = btrfs_header_generation(leaf);
1795 for (i = slot; i < nritems; i++) {
1796 item_off = btrfs_item_ptr_offset(leaf, i);
1797 item_len = btrfs_item_size_nr(leaf, i);
1799 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1802 if (sizeof(sh) + item_len + *sk_offset >
1803 BTRFS_SEARCH_ARGS_BUFSIZE) {
1808 btrfs_item_key_to_cpu(leaf, key, i);
1809 if (!key_in_sk(key, sk))
1812 sh.objectid = key->objectid;
1813 sh.offset = key->offset;
1814 sh.type = key->type;
1816 sh.transid = found_transid;
1818 /* copy search result header */
1819 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1820 *sk_offset += sizeof(sh);
1823 char *p = buf + *sk_offset;
1825 read_extent_buffer(leaf, p,
1826 item_off, item_len);
1827 *sk_offset += item_len;
1831 if (*num_found >= sk->nr_items)
1836 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1838 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1841 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1851 static noinline int search_ioctl(struct inode *inode,
1852 struct btrfs_ioctl_search_args *args)
1854 struct btrfs_root *root;
1855 struct btrfs_key key;
1856 struct btrfs_key max_key;
1857 struct btrfs_path *path;
1858 struct btrfs_ioctl_search_key *sk = &args->key;
1859 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1862 unsigned long sk_offset = 0;
1864 path = btrfs_alloc_path();
1868 if (sk->tree_id == 0) {
1869 /* search the root of the inode that was passed */
1870 root = BTRFS_I(inode)->root;
1872 key.objectid = sk->tree_id;
1873 key.type = BTRFS_ROOT_ITEM_KEY;
1874 key.offset = (u64)-1;
1875 root = btrfs_read_fs_root_no_name(info, &key);
1877 printk(KERN_ERR "could not find root %llu\n",
1879 btrfs_free_path(path);
1884 key.objectid = sk->min_objectid;
1885 key.type = sk->min_type;
1886 key.offset = sk->min_offset;
1888 max_key.objectid = sk->max_objectid;
1889 max_key.type = sk->max_type;
1890 max_key.offset = sk->max_offset;
1892 path->keep_locks = 1;
1895 ret = btrfs_search_forward(root, &key, &max_key, path,
1902 ret = copy_to_sk(root, path, &key, sk, args->buf,
1903 &sk_offset, &num_found);
1904 btrfs_release_path(path);
1905 if (ret || num_found >= sk->nr_items)
1911 sk->nr_items = num_found;
1912 btrfs_free_path(path);
1916 static noinline int btrfs_ioctl_tree_search(struct file *file,
1919 struct btrfs_ioctl_search_args *args;
1920 struct inode *inode;
1923 if (!capable(CAP_SYS_ADMIN))
1926 args = memdup_user(argp, sizeof(*args));
1928 return PTR_ERR(args);
1930 inode = file_inode(file);
1931 ret = search_ioctl(inode, args);
1932 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1939 * Search INODE_REFs to identify path name of 'dirid' directory
1940 * in a 'tree_id' tree. and sets path name to 'name'.
1942 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1943 u64 tree_id, u64 dirid, char *name)
1945 struct btrfs_root *root;
1946 struct btrfs_key key;
1952 struct btrfs_inode_ref *iref;
1953 struct extent_buffer *l;
1954 struct btrfs_path *path;
1956 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1961 path = btrfs_alloc_path();
1965 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1967 key.objectid = tree_id;
1968 key.type = BTRFS_ROOT_ITEM_KEY;
1969 key.offset = (u64)-1;
1970 root = btrfs_read_fs_root_no_name(info, &key);
1972 printk(KERN_ERR "could not find root %llu\n", tree_id);
1977 key.objectid = dirid;
1978 key.type = BTRFS_INODE_REF_KEY;
1979 key.offset = (u64)-1;
1982 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1987 slot = path->slots[0];
1988 if (ret > 0 && slot > 0)
1990 btrfs_item_key_to_cpu(l, &key, slot);
1992 if (ret > 0 && (key.objectid != dirid ||
1993 key.type != BTRFS_INODE_REF_KEY)) {
1998 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1999 len = btrfs_inode_ref_name_len(l, iref);
2001 total_len += len + 1;
2006 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
2008 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2011 btrfs_release_path(path);
2012 key.objectid = key.offset;
2013 key.offset = (u64)-1;
2014 dirid = key.objectid;
2018 memmove(name, ptr, total_len);
2019 name[total_len]='\0';
2022 btrfs_free_path(path);
2026 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2029 struct btrfs_ioctl_ino_lookup_args *args;
2030 struct inode *inode;
2033 if (!capable(CAP_SYS_ADMIN))
2036 args = memdup_user(argp, sizeof(*args));
2038 return PTR_ERR(args);
2040 inode = file_inode(file);
2042 if (args->treeid == 0)
2043 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2045 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2046 args->treeid, args->objectid,
2049 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2056 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2059 struct dentry *parent = fdentry(file);
2060 struct dentry *dentry;
2061 struct inode *dir = parent->d_inode;
2062 struct inode *inode;
2063 struct btrfs_root *root = BTRFS_I(dir)->root;
2064 struct btrfs_root *dest = NULL;
2065 struct btrfs_ioctl_vol_args *vol_args;
2066 struct btrfs_trans_handle *trans;
2067 struct btrfs_block_rsv block_rsv;
2068 u64 qgroup_reserved;
2073 vol_args = memdup_user(arg, sizeof(*vol_args));
2074 if (IS_ERR(vol_args))
2075 return PTR_ERR(vol_args);
2077 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2078 namelen = strlen(vol_args->name);
2079 if (strchr(vol_args->name, '/') ||
2080 strncmp(vol_args->name, "..", namelen) == 0) {
2085 err = mnt_want_write_file(file);
2089 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
2090 dentry = lookup_one_len(vol_args->name, parent, namelen);
2091 if (IS_ERR(dentry)) {
2092 err = PTR_ERR(dentry);
2093 goto out_unlock_dir;
2096 if (!dentry->d_inode) {
2101 inode = dentry->d_inode;
2102 dest = BTRFS_I(inode)->root;
2103 if (!capable(CAP_SYS_ADMIN)){
2105 * Regular user. Only allow this with a special mount
2106 * option, when the user has write+exec access to the
2107 * subvol root, and when rmdir(2) would have been
2110 * Note that this is _not_ check that the subvol is
2111 * empty or doesn't contain data that we wouldn't
2112 * otherwise be able to delete.
2114 * Users who want to delete empty subvols should try
2118 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2122 * Do not allow deletion if the parent dir is the same
2123 * as the dir to be deleted. That means the ioctl
2124 * must be called on the dentry referencing the root
2125 * of the subvol, not a random directory contained
2132 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2137 /* check if subvolume may be deleted by a user */
2138 err = btrfs_may_delete(dir, dentry, 1);
2142 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2147 mutex_lock(&inode->i_mutex);
2148 err = d_invalidate(dentry);
2152 down_write(&root->fs_info->subvol_sem);
2154 err = may_destroy_subvol(dest);
2158 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2160 * One for dir inode, two for dir entries, two for root
2163 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2164 5, &qgroup_reserved);
2168 trans = btrfs_start_transaction(root, 0);
2169 if (IS_ERR(trans)) {
2170 err = PTR_ERR(trans);
2173 trans->block_rsv = &block_rsv;
2174 trans->bytes_reserved = block_rsv.size;
2176 ret = btrfs_unlink_subvol(trans, root, dir,
2177 dest->root_key.objectid,
2178 dentry->d_name.name,
2179 dentry->d_name.len);
2182 btrfs_abort_transaction(trans, root, ret);
2186 btrfs_record_root_in_trans(trans, dest);
2188 memset(&dest->root_item.drop_progress, 0,
2189 sizeof(dest->root_item.drop_progress));
2190 dest->root_item.drop_level = 0;
2191 btrfs_set_root_refs(&dest->root_item, 0);
2193 if (!xchg(&dest->orphan_item_inserted, 1)) {
2194 ret = btrfs_insert_orphan_item(trans,
2195 root->fs_info->tree_root,
2196 dest->root_key.objectid);
2198 btrfs_abort_transaction(trans, root, ret);
2204 trans->block_rsv = NULL;
2205 trans->bytes_reserved = 0;
2206 ret = btrfs_end_transaction(trans, root);
2209 inode->i_flags |= S_DEAD;
2211 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2213 up_write(&root->fs_info->subvol_sem);
2215 mutex_unlock(&inode->i_mutex);
2217 shrink_dcache_sb(root->fs_info->sb);
2218 btrfs_invalidate_inodes(dest);
2222 if (dest->cache_inode) {
2223 iput(dest->cache_inode);
2224 dest->cache_inode = NULL;
2230 mutex_unlock(&dir->i_mutex);
2231 mnt_drop_write_file(file);
2237 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2239 struct inode *inode = file_inode(file);
2240 struct btrfs_root *root = BTRFS_I(inode)->root;
2241 struct btrfs_ioctl_defrag_range_args *range;
2244 ret = mnt_want_write_file(file);
2248 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2250 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2251 mnt_drop_write_file(file);
2255 if (btrfs_root_readonly(root)) {
2260 switch (inode->i_mode & S_IFMT) {
2262 if (!capable(CAP_SYS_ADMIN)) {
2266 ret = btrfs_defrag_root(root);
2269 ret = btrfs_defrag_root(root->fs_info->extent_root);
2272 if (!(file->f_mode & FMODE_WRITE)) {
2277 range = kzalloc(sizeof(*range), GFP_KERNEL);
2284 if (copy_from_user(range, argp,
2290 /* compression requires us to start the IO */
2291 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2292 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2293 range->extent_thresh = (u32)-1;
2296 /* the rest are all set to zero by kzalloc */
2297 range->len = (u64)-1;
2299 ret = btrfs_defrag_file(file_inode(file), file,
2309 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2310 mnt_drop_write_file(file);
2314 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2316 struct btrfs_ioctl_vol_args *vol_args;
2319 if (!capable(CAP_SYS_ADMIN))
2322 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2324 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2328 mutex_lock(&root->fs_info->volume_mutex);
2329 vol_args = memdup_user(arg, sizeof(*vol_args));
2330 if (IS_ERR(vol_args)) {
2331 ret = PTR_ERR(vol_args);
2335 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2336 ret = btrfs_init_new_device(root, vol_args->name);
2340 mutex_unlock(&root->fs_info->volume_mutex);
2341 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2345 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2347 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2348 struct btrfs_ioctl_vol_args *vol_args;
2351 if (!capable(CAP_SYS_ADMIN))
2354 ret = mnt_want_write_file(file);
2358 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2360 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2361 mnt_drop_write_file(file);
2365 mutex_lock(&root->fs_info->volume_mutex);
2366 vol_args = memdup_user(arg, sizeof(*vol_args));
2367 if (IS_ERR(vol_args)) {
2368 ret = PTR_ERR(vol_args);
2372 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2373 ret = btrfs_rm_device(root, vol_args->name);
2377 mutex_unlock(&root->fs_info->volume_mutex);
2378 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2379 mnt_drop_write_file(file);
2383 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2385 struct btrfs_ioctl_fs_info_args *fi_args;
2386 struct btrfs_device *device;
2387 struct btrfs_device *next;
2388 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2391 if (!capable(CAP_SYS_ADMIN))
2394 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2398 fi_args->num_devices = fs_devices->num_devices;
2399 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2401 mutex_lock(&fs_devices->device_list_mutex);
2402 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2403 if (device->devid > fi_args->max_id)
2404 fi_args->max_id = device->devid;
2406 mutex_unlock(&fs_devices->device_list_mutex);
2408 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2415 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2417 struct btrfs_ioctl_dev_info_args *di_args;
2418 struct btrfs_device *dev;
2419 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2421 char *s_uuid = NULL;
2422 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2424 if (!capable(CAP_SYS_ADMIN))
2427 di_args = memdup_user(arg, sizeof(*di_args));
2428 if (IS_ERR(di_args))
2429 return PTR_ERR(di_args);
2431 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2432 s_uuid = di_args->uuid;
2434 mutex_lock(&fs_devices->device_list_mutex);
2435 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2436 mutex_unlock(&fs_devices->device_list_mutex);
2443 di_args->devid = dev->devid;
2444 di_args->bytes_used = dev->bytes_used;
2445 di_args->total_bytes = dev->total_bytes;
2446 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2448 struct rcu_string *name;
2451 name = rcu_dereference(dev->name);
2452 strncpy(di_args->path, name->str, sizeof(di_args->path));
2454 di_args->path[sizeof(di_args->path) - 1] = 0;
2456 di_args->path[0] = '\0';
2460 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2467 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2468 u64 off, u64 olen, u64 destoff)
2470 struct inode *inode = file_inode(file);
2471 struct btrfs_root *root = BTRFS_I(inode)->root;
2474 struct btrfs_trans_handle *trans;
2475 struct btrfs_path *path;
2476 struct extent_buffer *leaf;
2478 struct btrfs_key key;
2483 u64 bs = root->fs_info->sb->s_blocksize;
2487 * - split compressed inline extents. annoying: we need to
2488 * decompress into destination's address_space (the file offset
2489 * may change, so source mapping won't do), then recompress (or
2490 * otherwise reinsert) a subrange.
2491 * - allow ranges within the same file to be cloned (provided
2492 * they don't overlap)?
2495 /* the destination must be opened for writing */
2496 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
2499 if (btrfs_root_readonly(root))
2502 ret = mnt_want_write_file(file);
2506 src_file = fdget(srcfd);
2507 if (!src_file.file) {
2509 goto out_drop_write;
2513 if (src_file.file->f_path.mnt != file->f_path.mnt)
2516 src = file_inode(src_file.file);
2522 /* the src must be open for reading */
2523 if (!(src_file.file->f_mode & FMODE_READ))
2526 /* don't make the dst file partly checksummed */
2527 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2528 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2532 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2536 if (src->i_sb != inode->i_sb)
2540 buf = vmalloc(btrfs_level_size(root, 0));
2544 path = btrfs_alloc_path();
2552 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2553 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
2555 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2556 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2559 /* determine range to clone */
2561 if (off + len > src->i_size || off + len < off)
2564 olen = len = src->i_size - off;
2565 /* if we extend to eof, continue to block boundary */
2566 if (off + len == src->i_size)
2567 len = ALIGN(src->i_size, bs) - off;
2569 /* verify the end result is block aligned */
2570 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2571 !IS_ALIGNED(destoff, bs))
2574 if (destoff > inode->i_size) {
2575 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2580 /* truncate page cache pages from target inode range */
2581 truncate_inode_pages_range(&inode->i_data, destoff,
2582 PAGE_CACHE_ALIGN(destoff + len) - 1);
2584 /* do any pending delalloc/csum calc on src, one way or
2585 another, and lock file content */
2587 struct btrfs_ordered_extent *ordered;
2588 lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2589 ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
2591 !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
2592 EXTENT_DELALLOC, 0, NULL))
2594 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2596 btrfs_put_ordered_extent(ordered);
2597 btrfs_wait_ordered_range(src, off, len);
2601 key.objectid = btrfs_ino(src);
2602 key.type = BTRFS_EXTENT_DATA_KEY;
2607 * note the key will change type as we walk through the
2610 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2615 nritems = btrfs_header_nritems(path->nodes[0]);
2616 if (path->slots[0] >= nritems) {
2617 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
2622 nritems = btrfs_header_nritems(path->nodes[0]);
2624 leaf = path->nodes[0];
2625 slot = path->slots[0];
2627 btrfs_item_key_to_cpu(leaf, &key, slot);
2628 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
2629 key.objectid != btrfs_ino(src))
2632 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2633 struct btrfs_file_extent_item *extent;
2636 struct btrfs_key new_key;
2637 u64 disko = 0, diskl = 0;
2638 u64 datao = 0, datal = 0;
2642 size = btrfs_item_size_nr(leaf, slot);
2643 read_extent_buffer(leaf, buf,
2644 btrfs_item_ptr_offset(leaf, slot),
2647 extent = btrfs_item_ptr(leaf, slot,
2648 struct btrfs_file_extent_item);
2649 comp = btrfs_file_extent_compression(leaf, extent);
2650 type = btrfs_file_extent_type(leaf, extent);
2651 if (type == BTRFS_FILE_EXTENT_REG ||
2652 type == BTRFS_FILE_EXTENT_PREALLOC) {
2653 disko = btrfs_file_extent_disk_bytenr(leaf,
2655 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2657 datao = btrfs_file_extent_offset(leaf, extent);
2658 datal = btrfs_file_extent_num_bytes(leaf,
2660 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2661 /* take upper bound, may be compressed */
2662 datal = btrfs_file_extent_ram_bytes(leaf,
2665 btrfs_release_path(path);
2667 if (key.offset + datal <= off ||
2668 key.offset >= off + len - 1)
2671 memcpy(&new_key, &key, sizeof(new_key));
2672 new_key.objectid = btrfs_ino(inode);
2673 if (off <= key.offset)
2674 new_key.offset = key.offset + destoff - off;
2676 new_key.offset = destoff;
2679 * 1 - adjusting old extent (we may have to split it)
2680 * 1 - add new extent
2683 trans = btrfs_start_transaction(root, 3);
2684 if (IS_ERR(trans)) {
2685 ret = PTR_ERR(trans);
2689 if (type == BTRFS_FILE_EXTENT_REG ||
2690 type == BTRFS_FILE_EXTENT_PREALLOC) {
2692 * a | --- range to clone ---| b
2693 * | ------------- extent ------------- |
2696 /* substract range b */
2697 if (key.offset + datal > off + len)
2698 datal = off + len - key.offset;
2700 /* substract range a */
2701 if (off > key.offset) {
2702 datao += off - key.offset;
2703 datal -= off - key.offset;
2706 ret = btrfs_drop_extents(trans, root, inode,
2708 new_key.offset + datal,
2711 btrfs_abort_transaction(trans, root,
2713 btrfs_end_transaction(trans, root);
2717 ret = btrfs_insert_empty_item(trans, root, path,
2720 btrfs_abort_transaction(trans, root,
2722 btrfs_end_transaction(trans, root);
2726 leaf = path->nodes[0];
2727 slot = path->slots[0];
2728 write_extent_buffer(leaf, buf,
2729 btrfs_item_ptr_offset(leaf, slot),
2732 extent = btrfs_item_ptr(leaf, slot,
2733 struct btrfs_file_extent_item);
2735 /* disko == 0 means it's a hole */
2739 btrfs_set_file_extent_offset(leaf, extent,
2741 btrfs_set_file_extent_num_bytes(leaf, extent,
2744 inode_add_bytes(inode, datal);
2745 ret = btrfs_inc_extent_ref(trans, root,
2747 root->root_key.objectid,
2749 new_key.offset - datao,
2752 btrfs_abort_transaction(trans,
2755 btrfs_end_transaction(trans,
2761 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2764 if (off > key.offset) {
2765 skip = off - key.offset;
2766 new_key.offset += skip;
2769 if (key.offset + datal > off + len)
2770 trim = key.offset + datal - (off + len);
2772 if (comp && (skip || trim)) {
2774 btrfs_end_transaction(trans, root);
2777 size -= skip + trim;
2778 datal -= skip + trim;
2780 ret = btrfs_drop_extents(trans, root, inode,
2782 new_key.offset + datal,
2785 btrfs_abort_transaction(trans, root,
2787 btrfs_end_transaction(trans, root);
2791 ret = btrfs_insert_empty_item(trans, root, path,
2794 btrfs_abort_transaction(trans, root,
2796 btrfs_end_transaction(trans, root);
2802 btrfs_file_extent_calc_inline_size(0);
2803 memmove(buf+start, buf+start+skip,
2807 leaf = path->nodes[0];
2808 slot = path->slots[0];
2809 write_extent_buffer(leaf, buf,
2810 btrfs_item_ptr_offset(leaf, slot),
2812 inode_add_bytes(inode, datal);
2815 btrfs_mark_buffer_dirty(leaf);
2816 btrfs_release_path(path);
2818 inode_inc_iversion(inode);
2819 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2822 * we round up to the block size at eof when
2823 * determining which extents to clone above,
2824 * but shouldn't round up the file size
2826 endoff = new_key.offset + datal;
2827 if (endoff > destoff+olen)
2828 endoff = destoff+olen;
2829 if (endoff > inode->i_size)
2830 btrfs_i_size_write(inode, endoff);
2832 ret = btrfs_update_inode(trans, root, inode);
2834 btrfs_abort_transaction(trans, root, ret);
2835 btrfs_end_transaction(trans, root);
2838 ret = btrfs_end_transaction(trans, root);
2841 btrfs_release_path(path);
2846 btrfs_release_path(path);
2847 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2849 mutex_unlock(&src->i_mutex);
2850 mutex_unlock(&inode->i_mutex);
2852 btrfs_free_path(path);
2856 mnt_drop_write_file(file);
2860 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
2862 struct btrfs_ioctl_clone_range_args args;
2864 if (copy_from_user(&args, argp, sizeof(args)))
2866 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2867 args.src_length, args.dest_offset);
2871 * there are many ways the trans_start and trans_end ioctls can lead
2872 * to deadlocks. They should only be used by applications that
2873 * basically own the machine, and have a very in depth understanding
2874 * of all the possible deadlocks and enospc problems.
2876 static long btrfs_ioctl_trans_start(struct file *file)
2878 struct inode *inode = file_inode(file);
2879 struct btrfs_root *root = BTRFS_I(inode)->root;
2880 struct btrfs_trans_handle *trans;
2884 if (!capable(CAP_SYS_ADMIN))
2888 if (file->private_data)
2892 if (btrfs_root_readonly(root))
2895 ret = mnt_want_write_file(file);
2899 atomic_inc(&root->fs_info->open_ioctl_trans);
2902 trans = btrfs_start_ioctl_transaction(root);
2906 file->private_data = trans;
2910 atomic_dec(&root->fs_info->open_ioctl_trans);
2911 mnt_drop_write_file(file);
2916 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2918 struct inode *inode = file_inode(file);
2919 struct btrfs_root *root = BTRFS_I(inode)->root;
2920 struct btrfs_root *new_root;
2921 struct btrfs_dir_item *di;
2922 struct btrfs_trans_handle *trans;
2923 struct btrfs_path *path;
2924 struct btrfs_key location;
2925 struct btrfs_disk_key disk_key;
2930 if (!capable(CAP_SYS_ADMIN))
2933 ret = mnt_want_write_file(file);
2937 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2943 objectid = root->root_key.objectid;
2945 location.objectid = objectid;
2946 location.type = BTRFS_ROOT_ITEM_KEY;
2947 location.offset = (u64)-1;
2949 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
2950 if (IS_ERR(new_root)) {
2951 ret = PTR_ERR(new_root);
2955 if (btrfs_root_refs(&new_root->root_item) == 0) {
2960 path = btrfs_alloc_path();
2965 path->leave_spinning = 1;
2967 trans = btrfs_start_transaction(root, 1);
2968 if (IS_ERR(trans)) {
2969 btrfs_free_path(path);
2970 ret = PTR_ERR(trans);
2974 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
2975 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
2976 dir_id, "default", 7, 1);
2977 if (IS_ERR_OR_NULL(di)) {
2978 btrfs_free_path(path);
2979 btrfs_end_transaction(trans, root);
2980 printk(KERN_ERR "Umm, you don't have the default dir item, "
2981 "this isn't going to work\n");
2986 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2987 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2988 btrfs_mark_buffer_dirty(path->nodes[0]);
2989 btrfs_free_path(path);
2991 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
2992 btrfs_end_transaction(trans, root);
2994 mnt_drop_write_file(file);
2998 void btrfs_get_block_group_info(struct list_head *groups_list,
2999 struct btrfs_ioctl_space_info *space)
3001 struct btrfs_block_group_cache *block_group;
3003 space->total_bytes = 0;
3004 space->used_bytes = 0;
3006 list_for_each_entry(block_group, groups_list, list) {
3007 space->flags = block_group->flags;
3008 space->total_bytes += block_group->key.offset;
3009 space->used_bytes +=
3010 btrfs_block_group_used(&block_group->item);
3014 long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
3016 struct btrfs_ioctl_space_args space_args;
3017 struct btrfs_ioctl_space_info space;
3018 struct btrfs_ioctl_space_info *dest;
3019 struct btrfs_ioctl_space_info *dest_orig;
3020 struct btrfs_ioctl_space_info __user *user_dest;
3021 struct btrfs_space_info *info;
3022 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3023 BTRFS_BLOCK_GROUP_SYSTEM,
3024 BTRFS_BLOCK_GROUP_METADATA,
3025 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3032 if (copy_from_user(&space_args,
3033 (struct btrfs_ioctl_space_args __user *)arg,
3034 sizeof(space_args)))
3037 for (i = 0; i < num_types; i++) {
3038 struct btrfs_space_info *tmp;
3042 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3044 if (tmp->flags == types[i]) {
3054 down_read(&info->groups_sem);
3055 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3056 if (!list_empty(&info->block_groups[c]))
3059 up_read(&info->groups_sem);
3062 /* space_slots == 0 means they are asking for a count */
3063 if (space_args.space_slots == 0) {
3064 space_args.total_spaces = slot_count;
3068 slot_count = min_t(u64, space_args.space_slots, slot_count);
3070 alloc_size = sizeof(*dest) * slot_count;
3072 /* we generally have at most 6 or so space infos, one for each raid
3073 * level. So, a whole page should be more than enough for everyone
3075 if (alloc_size > PAGE_CACHE_SIZE)
3078 space_args.total_spaces = 0;
3079 dest = kmalloc(alloc_size, GFP_NOFS);
3084 /* now we have a buffer to copy into */
3085 for (i = 0; i < num_types; i++) {
3086 struct btrfs_space_info *tmp;
3093 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3095 if (tmp->flags == types[i]) {
3104 down_read(&info->groups_sem);
3105 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3106 if (!list_empty(&info->block_groups[c])) {
3107 btrfs_get_block_group_info(
3108 &info->block_groups[c], &space);
3109 memcpy(dest, &space, sizeof(space));
3111 space_args.total_spaces++;
3117 up_read(&info->groups_sem);
3120 user_dest = (struct btrfs_ioctl_space_info __user *)
3121 (arg + sizeof(struct btrfs_ioctl_space_args));
3123 if (copy_to_user(user_dest, dest_orig, alloc_size))
3128 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3135 * there are many ways the trans_start and trans_end ioctls can lead
3136 * to deadlocks. They should only be used by applications that
3137 * basically own the machine, and have a very in depth understanding
3138 * of all the possible deadlocks and enospc problems.
3140 long btrfs_ioctl_trans_end(struct file *file)
3142 struct inode *inode = file_inode(file);
3143 struct btrfs_root *root = BTRFS_I(inode)->root;
3144 struct btrfs_trans_handle *trans;
3146 trans = file->private_data;
3149 file->private_data = NULL;
3151 btrfs_end_transaction(trans, root);
3153 atomic_dec(&root->fs_info->open_ioctl_trans);
3155 mnt_drop_write_file(file);
3159 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3162 struct btrfs_trans_handle *trans;
3166 trans = btrfs_attach_transaction_barrier(root);
3167 if (IS_ERR(trans)) {
3168 if (PTR_ERR(trans) != -ENOENT)
3169 return PTR_ERR(trans);
3171 /* No running transaction, don't bother */
3172 transid = root->fs_info->last_trans_committed;
3175 transid = trans->transid;
3176 ret = btrfs_commit_transaction_async(trans, root, 0);
3178 btrfs_end_transaction(trans, root);
3183 if (copy_to_user(argp, &transid, sizeof(transid)))
3188 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3194 if (copy_from_user(&transid, argp, sizeof(transid)))
3197 transid = 0; /* current trans */
3199 return btrfs_wait_for_commit(root, transid);
3202 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3204 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3205 struct btrfs_ioctl_scrub_args *sa;
3208 if (!capable(CAP_SYS_ADMIN))
3211 sa = memdup_user(arg, sizeof(*sa));
3215 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3216 ret = mnt_want_write_file(file);
3221 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
3222 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3225 if (copy_to_user(arg, sa, sizeof(*sa)))
3228 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3229 mnt_drop_write_file(file);
3235 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3237 if (!capable(CAP_SYS_ADMIN))
3240 return btrfs_scrub_cancel(root->fs_info);
3243 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3246 struct btrfs_ioctl_scrub_args *sa;
3249 if (!capable(CAP_SYS_ADMIN))
3252 sa = memdup_user(arg, sizeof(*sa));
3256 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3258 if (copy_to_user(arg, sa, sizeof(*sa)))
3265 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3268 struct btrfs_ioctl_get_dev_stats *sa;
3271 sa = memdup_user(arg, sizeof(*sa));
3275 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3280 ret = btrfs_get_dev_stats(root, sa);
3282 if (copy_to_user(arg, sa, sizeof(*sa)))
3289 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3291 struct btrfs_ioctl_dev_replace_args *p;
3294 if (!capable(CAP_SYS_ADMIN))
3297 p = memdup_user(arg, sizeof(*p));
3302 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3304 &root->fs_info->mutually_exclusive_operation_running,
3306 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3309 ret = btrfs_dev_replace_start(root, p);
3311 &root->fs_info->mutually_exclusive_operation_running,
3315 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3316 btrfs_dev_replace_status(root->fs_info, p);
3319 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3320 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3327 if (copy_to_user(arg, p, sizeof(*p)))
3334 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3340 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3341 struct inode_fs_paths *ipath = NULL;
3342 struct btrfs_path *path;
3344 if (!capable(CAP_DAC_READ_SEARCH))
3347 path = btrfs_alloc_path();
3353 ipa = memdup_user(arg, sizeof(*ipa));
3360 size = min_t(u32, ipa->size, 4096);
3361 ipath = init_ipath(size, root, path);
3362 if (IS_ERR(ipath)) {
3363 ret = PTR_ERR(ipath);
3368 ret = paths_from_inode(ipa->inum, ipath);
3372 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3373 rel_ptr = ipath->fspath->val[i] -
3374 (u64)(unsigned long)ipath->fspath->val;
3375 ipath->fspath->val[i] = rel_ptr;
3378 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3379 (void *)(unsigned long)ipath->fspath, size);
3386 btrfs_free_path(path);
3393 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3395 struct btrfs_data_container *inodes = ctx;
3396 const size_t c = 3 * sizeof(u64);
3398 if (inodes->bytes_left >= c) {
3399 inodes->bytes_left -= c;
3400 inodes->val[inodes->elem_cnt] = inum;
3401 inodes->val[inodes->elem_cnt + 1] = offset;
3402 inodes->val[inodes->elem_cnt + 2] = root;
3403 inodes->elem_cnt += 3;
3405 inodes->bytes_missing += c - inodes->bytes_left;
3406 inodes->bytes_left = 0;
3407 inodes->elem_missed += 3;
3413 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3418 struct btrfs_ioctl_logical_ino_args *loi;
3419 struct btrfs_data_container *inodes = NULL;
3420 struct btrfs_path *path = NULL;
3422 if (!capable(CAP_SYS_ADMIN))
3425 loi = memdup_user(arg, sizeof(*loi));
3432 path = btrfs_alloc_path();
3438 size = min_t(u32, loi->size, 64 * 1024);
3439 inodes = init_data_container(size);
3440 if (IS_ERR(inodes)) {
3441 ret = PTR_ERR(inodes);
3446 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3447 build_ino_list, inodes);
3453 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3454 (void *)(unsigned long)inodes, size);
3459 btrfs_free_path(path);
3466 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3467 struct btrfs_ioctl_balance_args *bargs)
3469 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3471 bargs->flags = bctl->flags;
3473 if (atomic_read(&fs_info->balance_running))
3474 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3475 if (atomic_read(&fs_info->balance_pause_req))
3476 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3477 if (atomic_read(&fs_info->balance_cancel_req))
3478 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3480 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3481 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3482 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3485 spin_lock(&fs_info->balance_lock);
3486 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3487 spin_unlock(&fs_info->balance_lock);
3489 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3493 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3495 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3496 struct btrfs_fs_info *fs_info = root->fs_info;
3497 struct btrfs_ioctl_balance_args *bargs;
3498 struct btrfs_balance_control *bctl;
3499 bool need_unlock; /* for mut. excl. ops lock */
3502 if (!capable(CAP_SYS_ADMIN))
3505 ret = mnt_want_write_file(file);
3510 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
3511 mutex_lock(&fs_info->volume_mutex);
3512 mutex_lock(&fs_info->balance_mutex);
3518 * mut. excl. ops lock is locked. Three possibilites:
3519 * (1) some other op is running
3520 * (2) balance is running
3521 * (3) balance is paused -- special case (think resume)
3523 mutex_lock(&fs_info->balance_mutex);
3524 if (fs_info->balance_ctl) {
3525 /* this is either (2) or (3) */
3526 if (!atomic_read(&fs_info->balance_running)) {
3527 mutex_unlock(&fs_info->balance_mutex);
3528 if (!mutex_trylock(&fs_info->volume_mutex))
3530 mutex_lock(&fs_info->balance_mutex);
3532 if (fs_info->balance_ctl &&
3533 !atomic_read(&fs_info->balance_running)) {
3535 need_unlock = false;
3539 mutex_unlock(&fs_info->balance_mutex);
3540 mutex_unlock(&fs_info->volume_mutex);
3544 mutex_unlock(&fs_info->balance_mutex);
3550 mutex_unlock(&fs_info->balance_mutex);
3551 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3557 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
3560 bargs = memdup_user(arg, sizeof(*bargs));
3561 if (IS_ERR(bargs)) {
3562 ret = PTR_ERR(bargs);
3566 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3567 if (!fs_info->balance_ctl) {
3572 bctl = fs_info->balance_ctl;
3573 spin_lock(&fs_info->balance_lock);
3574 bctl->flags |= BTRFS_BALANCE_RESUME;
3575 spin_unlock(&fs_info->balance_lock);
3583 if (fs_info->balance_ctl) {
3588 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3594 bctl->fs_info = fs_info;
3596 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3597 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3598 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3600 bctl->flags = bargs->flags;
3602 /* balance everything - no filters */
3603 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
3608 * Ownership of bctl and mutually_exclusive_operation_running
3609 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
3610 * or, if restriper was paused all the way until unmount, in
3611 * free_fs_info. mutually_exclusive_operation_running is
3612 * cleared in __cancel_balance.
3614 need_unlock = false;
3616 ret = btrfs_balance(bctl, bargs);
3619 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3626 mutex_unlock(&fs_info->balance_mutex);
3627 mutex_unlock(&fs_info->volume_mutex);
3629 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3631 mnt_drop_write_file(file);
3635 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3637 if (!capable(CAP_SYS_ADMIN))
3641 case BTRFS_BALANCE_CTL_PAUSE:
3642 return btrfs_pause_balance(root->fs_info);
3643 case BTRFS_BALANCE_CTL_CANCEL:
3644 return btrfs_cancel_balance(root->fs_info);
3650 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3653 struct btrfs_fs_info *fs_info = root->fs_info;
3654 struct btrfs_ioctl_balance_args *bargs;
3657 if (!capable(CAP_SYS_ADMIN))
3660 mutex_lock(&fs_info->balance_mutex);
3661 if (!fs_info->balance_ctl) {
3666 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3672 update_ioctl_balance_args(fs_info, 1, bargs);
3674 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3679 mutex_unlock(&fs_info->balance_mutex);
3683 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3685 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3686 struct btrfs_ioctl_quota_ctl_args *sa;
3687 struct btrfs_trans_handle *trans = NULL;
3691 if (!capable(CAP_SYS_ADMIN))
3694 ret = mnt_want_write_file(file);
3698 sa = memdup_user(arg, sizeof(*sa));
3704 if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
3705 trans = btrfs_start_transaction(root, 2);
3706 if (IS_ERR(trans)) {
3707 ret = PTR_ERR(trans);
3713 case BTRFS_QUOTA_CTL_ENABLE:
3714 ret = btrfs_quota_enable(trans, root->fs_info);
3716 case BTRFS_QUOTA_CTL_DISABLE:
3717 ret = btrfs_quota_disable(trans, root->fs_info);
3719 case BTRFS_QUOTA_CTL_RESCAN:
3720 ret = btrfs_quota_rescan(root->fs_info);
3727 if (copy_to_user(arg, sa, sizeof(*sa)))
3731 err = btrfs_commit_transaction(trans, root);
3738 mnt_drop_write_file(file);
3742 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3744 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3745 struct btrfs_ioctl_qgroup_assign_args *sa;
3746 struct btrfs_trans_handle *trans;
3750 if (!capable(CAP_SYS_ADMIN))
3753 ret = mnt_want_write_file(file);
3757 sa = memdup_user(arg, sizeof(*sa));
3763 trans = btrfs_join_transaction(root);
3764 if (IS_ERR(trans)) {
3765 ret = PTR_ERR(trans);
3769 /* FIXME: check if the IDs really exist */
3771 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3774 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3778 err = btrfs_end_transaction(trans, root);
3785 mnt_drop_write_file(file);
3789 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3791 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3792 struct btrfs_ioctl_qgroup_create_args *sa;
3793 struct btrfs_trans_handle *trans;
3797 if (!capable(CAP_SYS_ADMIN))
3800 ret = mnt_want_write_file(file);
3804 sa = memdup_user(arg, sizeof(*sa));
3810 if (!sa->qgroupid) {
3815 trans = btrfs_join_transaction(root);
3816 if (IS_ERR(trans)) {
3817 ret = PTR_ERR(trans);
3821 /* FIXME: check if the IDs really exist */
3823 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3826 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3829 err = btrfs_end_transaction(trans, root);
3836 mnt_drop_write_file(file);
3840 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3842 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3843 struct btrfs_ioctl_qgroup_limit_args *sa;
3844 struct btrfs_trans_handle *trans;
3849 if (!capable(CAP_SYS_ADMIN))
3852 ret = mnt_want_write_file(file);
3856 sa = memdup_user(arg, sizeof(*sa));
3862 trans = btrfs_join_transaction(root);
3863 if (IS_ERR(trans)) {
3864 ret = PTR_ERR(trans);
3868 qgroupid = sa->qgroupid;
3870 /* take the current subvol as qgroup */
3871 qgroupid = root->root_key.objectid;
3874 /* FIXME: check if the IDs really exist */
3875 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3877 err = btrfs_end_transaction(trans, root);
3884 mnt_drop_write_file(file);
3888 static long btrfs_ioctl_set_received_subvol(struct file *file,
3891 struct btrfs_ioctl_received_subvol_args *sa = NULL;
3892 struct inode *inode = file_inode(file);
3893 struct btrfs_root *root = BTRFS_I(inode)->root;
3894 struct btrfs_root_item *root_item = &root->root_item;
3895 struct btrfs_trans_handle *trans;
3896 struct timespec ct = CURRENT_TIME;
3899 ret = mnt_want_write_file(file);
3903 down_write(&root->fs_info->subvol_sem);
3905 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
3910 if (btrfs_root_readonly(root)) {
3915 if (!inode_owner_or_capable(inode)) {
3920 sa = memdup_user(arg, sizeof(*sa));
3927 trans = btrfs_start_transaction(root, 1);
3928 if (IS_ERR(trans)) {
3929 ret = PTR_ERR(trans);
3934 sa->rtransid = trans->transid;
3935 sa->rtime.sec = ct.tv_sec;
3936 sa->rtime.nsec = ct.tv_nsec;
3938 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
3939 btrfs_set_root_stransid(root_item, sa->stransid);
3940 btrfs_set_root_rtransid(root_item, sa->rtransid);
3941 root_item->stime.sec = cpu_to_le64(sa->stime.sec);
3942 root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
3943 root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
3944 root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
3946 ret = btrfs_update_root(trans, root->fs_info->tree_root,
3947 &root->root_key, &root->root_item);
3949 btrfs_end_transaction(trans, root);
3953 ret = btrfs_commit_transaction(trans, root);
3958 ret = copy_to_user(arg, sa, sizeof(*sa));
3964 up_write(&root->fs_info->subvol_sem);
3965 mnt_drop_write_file(file);
3969 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
3971 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3972 const char *label = root->fs_info->super_copy->label;
3973 size_t len = strnlen(label, BTRFS_LABEL_SIZE);
3976 if (len == BTRFS_LABEL_SIZE) {
3977 pr_warn("btrfs: label is too long, return the first %zu bytes\n",
3981 mutex_lock(&root->fs_info->volume_mutex);
3982 ret = copy_to_user(arg, label, len);
3983 mutex_unlock(&root->fs_info->volume_mutex);
3985 return ret ? -EFAULT : 0;
3988 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
3990 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3991 struct btrfs_super_block *super_block = root->fs_info->super_copy;
3992 struct btrfs_trans_handle *trans;
3993 char label[BTRFS_LABEL_SIZE];
3996 if (!capable(CAP_SYS_ADMIN))
3999 if (copy_from_user(label, arg, sizeof(label)))
4002 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4003 pr_err("btrfs: unable to set label with more than %d bytes\n",
4004 BTRFS_LABEL_SIZE - 1);
4008 ret = mnt_want_write_file(file);
4012 mutex_lock(&root->fs_info->volume_mutex);
4013 trans = btrfs_start_transaction(root, 0);
4014 if (IS_ERR(trans)) {
4015 ret = PTR_ERR(trans);
4019 strcpy(super_block->label, label);
4020 ret = btrfs_end_transaction(trans, root);
4023 mutex_unlock(&root->fs_info->volume_mutex);
4024 mnt_drop_write_file(file);
4028 long btrfs_ioctl(struct file *file, unsigned int
4029 cmd, unsigned long arg)
4031 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4032 void __user *argp = (void __user *)arg;
4035 case FS_IOC_GETFLAGS:
4036 return btrfs_ioctl_getflags(file, argp);
4037 case FS_IOC_SETFLAGS:
4038 return btrfs_ioctl_setflags(file, argp);
4039 case FS_IOC_GETVERSION:
4040 return btrfs_ioctl_getversion(file, argp);
4042 return btrfs_ioctl_fitrim(file, argp);
4043 case BTRFS_IOC_SNAP_CREATE:
4044 return btrfs_ioctl_snap_create(file, argp, 0);
4045 case BTRFS_IOC_SNAP_CREATE_V2:
4046 return btrfs_ioctl_snap_create_v2(file, argp, 0);
4047 case BTRFS_IOC_SUBVOL_CREATE:
4048 return btrfs_ioctl_snap_create(file, argp, 1);
4049 case BTRFS_IOC_SUBVOL_CREATE_V2:
4050 return btrfs_ioctl_snap_create_v2(file, argp, 1);
4051 case BTRFS_IOC_SNAP_DESTROY:
4052 return btrfs_ioctl_snap_destroy(file, argp);
4053 case BTRFS_IOC_SUBVOL_GETFLAGS:
4054 return btrfs_ioctl_subvol_getflags(file, argp);
4055 case BTRFS_IOC_SUBVOL_SETFLAGS:
4056 return btrfs_ioctl_subvol_setflags(file, argp);
4057 case BTRFS_IOC_DEFAULT_SUBVOL:
4058 return btrfs_ioctl_default_subvol(file, argp);
4059 case BTRFS_IOC_DEFRAG:
4060 return btrfs_ioctl_defrag(file, NULL);
4061 case BTRFS_IOC_DEFRAG_RANGE:
4062 return btrfs_ioctl_defrag(file, argp);
4063 case BTRFS_IOC_RESIZE:
4064 return btrfs_ioctl_resize(file, argp);
4065 case BTRFS_IOC_ADD_DEV:
4066 return btrfs_ioctl_add_dev(root, argp);
4067 case BTRFS_IOC_RM_DEV:
4068 return btrfs_ioctl_rm_dev(file, argp);
4069 case BTRFS_IOC_FS_INFO:
4070 return btrfs_ioctl_fs_info(root, argp);
4071 case BTRFS_IOC_DEV_INFO:
4072 return btrfs_ioctl_dev_info(root, argp);
4073 case BTRFS_IOC_BALANCE:
4074 return btrfs_ioctl_balance(file, NULL);
4075 case BTRFS_IOC_CLONE:
4076 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4077 case BTRFS_IOC_CLONE_RANGE:
4078 return btrfs_ioctl_clone_range(file, argp);
4079 case BTRFS_IOC_TRANS_START:
4080 return btrfs_ioctl_trans_start(file);
4081 case BTRFS_IOC_TRANS_END:
4082 return btrfs_ioctl_trans_end(file);
4083 case BTRFS_IOC_TREE_SEARCH:
4084 return btrfs_ioctl_tree_search(file, argp);
4085 case BTRFS_IOC_INO_LOOKUP:
4086 return btrfs_ioctl_ino_lookup(file, argp);
4087 case BTRFS_IOC_INO_PATHS:
4088 return btrfs_ioctl_ino_to_path(root, argp);
4089 case BTRFS_IOC_LOGICAL_INO:
4090 return btrfs_ioctl_logical_to_ino(root, argp);
4091 case BTRFS_IOC_SPACE_INFO:
4092 return btrfs_ioctl_space_info(root, argp);
4093 case BTRFS_IOC_SYNC:
4094 btrfs_sync_fs(file->f_dentry->d_sb, 1);
4096 case BTRFS_IOC_START_SYNC:
4097 return btrfs_ioctl_start_sync(root, argp);
4098 case BTRFS_IOC_WAIT_SYNC:
4099 return btrfs_ioctl_wait_sync(root, argp);
4100 case BTRFS_IOC_SCRUB:
4101 return btrfs_ioctl_scrub(file, argp);
4102 case BTRFS_IOC_SCRUB_CANCEL:
4103 return btrfs_ioctl_scrub_cancel(root, argp);
4104 case BTRFS_IOC_SCRUB_PROGRESS:
4105 return btrfs_ioctl_scrub_progress(root, argp);
4106 case BTRFS_IOC_BALANCE_V2:
4107 return btrfs_ioctl_balance(file, argp);
4108 case BTRFS_IOC_BALANCE_CTL:
4109 return btrfs_ioctl_balance_ctl(root, arg);
4110 case BTRFS_IOC_BALANCE_PROGRESS:
4111 return btrfs_ioctl_balance_progress(root, argp);
4112 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4113 return btrfs_ioctl_set_received_subvol(file, argp);
4114 case BTRFS_IOC_SEND:
4115 return btrfs_ioctl_send(file, argp);
4116 case BTRFS_IOC_GET_DEV_STATS:
4117 return btrfs_ioctl_get_dev_stats(root, argp);
4118 case BTRFS_IOC_QUOTA_CTL:
4119 return btrfs_ioctl_quota_ctl(file, argp);
4120 case BTRFS_IOC_QGROUP_ASSIGN:
4121 return btrfs_ioctl_qgroup_assign(file, argp);
4122 case BTRFS_IOC_QGROUP_CREATE:
4123 return btrfs_ioctl_qgroup_create(file, argp);
4124 case BTRFS_IOC_QGROUP_LIMIT:
4125 return btrfs_ioctl_qgroup_limit(file, argp);
4126 case BTRFS_IOC_DEV_REPLACE:
4127 return btrfs_ioctl_dev_replace(root, argp);
4128 case BTRFS_IOC_GET_FSLABEL:
4129 return btrfs_ioctl_get_fslabel(file, argp);
4130 case BTRFS_IOC_SET_FSLABEL:
4131 return btrfs_ioctl_set_fslabel(file, argp);