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>
48 #include "transaction.h"
49 #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->f_path.dentry->d_inode);
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->f_path.dentry->d_inode;
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->f_path.dentry->d_inode;
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 btrfs_root *root,
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 *new_root;
378 struct dentry *parent = dentry->d_parent;
380 struct timespec cur_time = CURRENT_TIME;
384 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
388 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
392 dir = parent->d_inode;
400 trans = btrfs_start_transaction(root, 6);
402 return PTR_ERR(trans);
404 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,
405 inherit ? *inherit : NULL);
409 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
410 0, objectid, NULL, 0, 0, 0);
416 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
417 btrfs_set_header_bytenr(leaf, leaf->start);
418 btrfs_set_header_generation(leaf, trans->transid);
419 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
420 btrfs_set_header_owner(leaf, objectid);
422 write_extent_buffer(leaf, root->fs_info->fsid,
423 (unsigned long)btrfs_header_fsid(leaf),
425 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
426 (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
428 btrfs_mark_buffer_dirty(leaf);
430 memset(&root_item, 0, sizeof(root_item));
432 inode_item = &root_item.inode;
433 inode_item->generation = cpu_to_le64(1);
434 inode_item->size = cpu_to_le64(3);
435 inode_item->nlink = cpu_to_le32(1);
436 inode_item->nbytes = cpu_to_le64(root->leafsize);
437 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
440 root_item.byte_limit = 0;
441 inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
443 btrfs_set_root_bytenr(&root_item, leaf->start);
444 btrfs_set_root_generation(&root_item, trans->transid);
445 btrfs_set_root_level(&root_item, 0);
446 btrfs_set_root_refs(&root_item, 1);
447 btrfs_set_root_used(&root_item, leaf->len);
448 btrfs_set_root_last_snapshot(&root_item, 0);
450 btrfs_set_root_generation_v2(&root_item,
451 btrfs_root_generation(&root_item));
452 uuid_le_gen(&new_uuid);
453 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
454 root_item.otime.sec = cpu_to_le64(cur_time.tv_sec);
455 root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec);
456 root_item.ctime = root_item.otime;
457 btrfs_set_root_ctransid(&root_item, trans->transid);
458 btrfs_set_root_otransid(&root_item, trans->transid);
460 btrfs_tree_unlock(leaf);
461 free_extent_buffer(leaf);
464 btrfs_set_root_dirid(&root_item, new_dirid);
466 key.objectid = objectid;
468 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
469 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
474 key.offset = (u64)-1;
475 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
476 if (IS_ERR(new_root)) {
477 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
478 ret = PTR_ERR(new_root);
482 btrfs_record_root_in_trans(trans, new_root);
484 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
486 /* We potentially lose an unused inode item here */
487 btrfs_abort_transaction(trans, root, ret);
492 * insert the directory item
494 ret = btrfs_set_inode_index(dir, &index);
496 btrfs_abort_transaction(trans, root, ret);
500 ret = btrfs_insert_dir_item(trans, root,
501 name, namelen, dir, &key,
502 BTRFS_FT_DIR, index);
504 btrfs_abort_transaction(trans, root, ret);
508 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
509 ret = btrfs_update_inode(trans, root, dir);
512 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
513 objectid, root->root_key.objectid,
514 btrfs_ino(dir), index, name, namelen);
518 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
521 *async_transid = trans->transid;
522 err = btrfs_commit_transaction_async(trans, root, 1);
524 err = btrfs_commit_transaction(trans, root);
531 static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
532 char *name, int namelen, u64 *async_transid,
533 bool readonly, struct btrfs_qgroup_inherit **inherit)
536 struct btrfs_pending_snapshot *pending_snapshot;
537 struct btrfs_trans_handle *trans;
543 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
544 if (!pending_snapshot)
547 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
548 BTRFS_BLOCK_RSV_TEMP);
549 pending_snapshot->dentry = dentry;
550 pending_snapshot->root = root;
551 pending_snapshot->readonly = readonly;
553 pending_snapshot->inherit = *inherit;
554 *inherit = NULL; /* take responsibility to free it */
557 trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
559 ret = PTR_ERR(trans);
563 ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
566 spin_lock(&root->fs_info->trans_lock);
567 list_add(&pending_snapshot->list,
568 &trans->transaction->pending_snapshots);
569 spin_unlock(&root->fs_info->trans_lock);
571 *async_transid = trans->transid;
572 ret = btrfs_commit_transaction_async(trans,
573 root->fs_info->extent_root, 1);
575 ret = btrfs_commit_transaction(trans,
576 root->fs_info->extent_root);
579 /* cleanup_transaction has freed this for us */
581 pending_snapshot = NULL;
585 ret = pending_snapshot->error;
589 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
593 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
595 ret = PTR_ERR(inode);
599 d_instantiate(dentry, inode);
602 kfree(pending_snapshot);
606 /* copy of check_sticky in fs/namei.c()
607 * It's inline, so penalty for filesystems that don't use sticky bit is
610 static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
612 kuid_t fsuid = current_fsuid();
614 if (!(dir->i_mode & S_ISVTX))
616 if (uid_eq(inode->i_uid, fsuid))
618 if (uid_eq(dir->i_uid, fsuid))
620 return !capable(CAP_FOWNER);
623 /* copy of may_delete in fs/namei.c()
624 * Check whether we can remove a link victim from directory dir, check
625 * whether the type of victim is right.
626 * 1. We can't do it if dir is read-only (done in permission())
627 * 2. We should have write and exec permissions on dir
628 * 3. We can't remove anything from append-only dir
629 * 4. We can't do anything with immutable dir (done in permission())
630 * 5. If the sticky bit on dir is set we should either
631 * a. be owner of dir, or
632 * b. be owner of victim, or
633 * c. have CAP_FOWNER capability
634 * 6. If the victim is append-only or immutable we can't do antyhing with
635 * links pointing to it.
636 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
637 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
638 * 9. We can't remove a root or mountpoint.
639 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
640 * nfs_async_unlink().
643 static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
647 if (!victim->d_inode)
650 BUG_ON(victim->d_parent->d_inode != dir);
651 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
653 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
658 if (btrfs_check_sticky(dir, victim->d_inode)||
659 IS_APPEND(victim->d_inode)||
660 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
663 if (!S_ISDIR(victim->d_inode->i_mode))
667 } else if (S_ISDIR(victim->d_inode->i_mode))
671 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
676 /* copy of may_create in fs/namei.c() */
677 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
683 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
687 * Create a new subvolume below @parent. This is largely modeled after
688 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
689 * inside this filesystem so it's quite a bit simpler.
691 static noinline int btrfs_mksubvol(struct path *parent,
692 char *name, int namelen,
693 struct btrfs_root *snap_src,
694 u64 *async_transid, bool readonly,
695 struct btrfs_qgroup_inherit **inherit)
697 struct inode *dir = parent->dentry->d_inode;
698 struct dentry *dentry;
701 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
703 dentry = lookup_one_len(name, parent->dentry, namelen);
704 error = PTR_ERR(dentry);
712 error = btrfs_may_create(dir, dentry);
717 * even if this name doesn't exist, we may get hash collisions.
718 * check for them now when we can safely fail
720 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
726 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
728 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
732 error = create_snapshot(snap_src, dentry, name, namelen,
733 async_transid, readonly, inherit);
735 error = create_subvol(BTRFS_I(dir)->root, dentry,
736 name, namelen, async_transid, inherit);
739 fsnotify_mkdir(dir, dentry);
741 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
745 mutex_unlock(&dir->i_mutex);
750 * When we're defragging a range, we don't want to kick it off again
751 * if it is really just waiting for delalloc to send it down.
752 * If we find a nice big extent or delalloc range for the bytes in the
753 * file you want to defrag, we return 0 to let you know to skip this
756 static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
758 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
759 struct extent_map *em = NULL;
760 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
763 read_lock(&em_tree->lock);
764 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
765 read_unlock(&em_tree->lock);
768 end = extent_map_end(em);
770 if (end - offset > thresh)
773 /* if we already have a nice delalloc here, just stop */
775 end = count_range_bits(io_tree, &offset, offset + thresh,
776 thresh, EXTENT_DELALLOC, 1);
783 * helper function to walk through a file and find extents
784 * newer than a specific transid, and smaller than thresh.
786 * This is used by the defragging code to find new and small
789 static int find_new_extents(struct btrfs_root *root,
790 struct inode *inode, u64 newer_than,
791 u64 *off, int thresh)
793 struct btrfs_path *path;
794 struct btrfs_key min_key;
795 struct btrfs_key max_key;
796 struct extent_buffer *leaf;
797 struct btrfs_file_extent_item *extent;
800 u64 ino = btrfs_ino(inode);
802 path = btrfs_alloc_path();
806 min_key.objectid = ino;
807 min_key.type = BTRFS_EXTENT_DATA_KEY;
808 min_key.offset = *off;
810 max_key.objectid = ino;
811 max_key.type = (u8)-1;
812 max_key.offset = (u64)-1;
814 path->keep_locks = 1;
817 ret = btrfs_search_forward(root, &min_key, &max_key,
818 path, 0, newer_than);
821 if (min_key.objectid != ino)
823 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
826 leaf = path->nodes[0];
827 extent = btrfs_item_ptr(leaf, path->slots[0],
828 struct btrfs_file_extent_item);
830 type = btrfs_file_extent_type(leaf, extent);
831 if (type == BTRFS_FILE_EXTENT_REG &&
832 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
833 check_defrag_in_cache(inode, min_key.offset, thresh)) {
834 *off = min_key.offset;
835 btrfs_free_path(path);
839 if (min_key.offset == (u64)-1)
843 btrfs_release_path(path);
846 btrfs_free_path(path);
850 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
852 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
853 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
854 struct extent_map *em;
855 u64 len = PAGE_CACHE_SIZE;
858 * hopefully we have this extent in the tree already, try without
859 * the full extent lock
861 read_lock(&em_tree->lock);
862 em = lookup_extent_mapping(em_tree, start, len);
863 read_unlock(&em_tree->lock);
866 /* get the big lock and read metadata off disk */
867 lock_extent(io_tree, start, start + len - 1);
868 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
869 unlock_extent(io_tree, start, start + len - 1);
878 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
880 struct extent_map *next;
883 /* this is the last extent */
884 if (em->start + em->len >= i_size_read(inode))
887 next = defrag_lookup_extent(inode, em->start + em->len);
888 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
891 free_extent_map(next);
895 static int should_defrag_range(struct inode *inode, u64 start, int thresh,
896 u64 *last_len, u64 *skip, u64 *defrag_end,
899 struct extent_map *em;
901 bool next_mergeable = true;
904 * make sure that once we start defragging an extent, we keep on
907 if (start < *defrag_end)
912 em = defrag_lookup_extent(inode, start);
916 /* this will cover holes, and inline extents */
917 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
922 next_mergeable = defrag_check_next_extent(inode, em);
925 * we hit a real extent, if it is big or the next extent is not a
926 * real extent, don't bother defragging it
928 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
929 (em->len >= thresh || !next_mergeable))
933 * last_len ends up being a counter of how many bytes we've defragged.
934 * every time we choose not to defrag an extent, we reset *last_len
935 * so that the next tiny extent will force a defrag.
937 * The end result of this is that tiny extents before a single big
938 * extent will force at least part of that big extent to be defragged.
941 *defrag_end = extent_map_end(em);
944 *skip = extent_map_end(em);
953 * it doesn't do much good to defrag one or two pages
954 * at a time. This pulls in a nice chunk of pages
957 * It also makes sure the delalloc code has enough
958 * dirty data to avoid making new small extents as part
961 * It's a good idea to start RA on this range
962 * before calling this.
964 static int cluster_pages_for_defrag(struct inode *inode,
966 unsigned long start_index,
969 unsigned long file_end;
970 u64 isize = i_size_read(inode);
977 struct btrfs_ordered_extent *ordered;
978 struct extent_state *cached_state = NULL;
979 struct extent_io_tree *tree;
980 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
982 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
983 if (!isize || start_index > file_end)
986 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
988 ret = btrfs_delalloc_reserve_space(inode,
989 page_cnt << PAGE_CACHE_SHIFT);
993 tree = &BTRFS_I(inode)->io_tree;
995 /* step one, lock all the pages */
996 for (i = 0; i < page_cnt; i++) {
999 page = find_or_create_page(inode->i_mapping,
1000 start_index + i, mask);
1004 page_start = page_offset(page);
1005 page_end = page_start + PAGE_CACHE_SIZE - 1;
1007 lock_extent(tree, page_start, page_end);
1008 ordered = btrfs_lookup_ordered_extent(inode,
1010 unlock_extent(tree, page_start, page_end);
1015 btrfs_start_ordered_extent(inode, ordered, 1);
1016 btrfs_put_ordered_extent(ordered);
1019 * we unlocked the page above, so we need check if
1020 * it was released or not.
1022 if (page->mapping != inode->i_mapping) {
1024 page_cache_release(page);
1029 if (!PageUptodate(page)) {
1030 btrfs_readpage(NULL, page);
1032 if (!PageUptodate(page)) {
1034 page_cache_release(page);
1040 if (page->mapping != inode->i_mapping) {
1042 page_cache_release(page);
1052 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1056 * so now we have a nice long stream of locked
1057 * and up to date pages, lets wait on them
1059 for (i = 0; i < i_done; i++)
1060 wait_on_page_writeback(pages[i]);
1062 page_start = page_offset(pages[0]);
1063 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1065 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1066 page_start, page_end - 1, 0, &cached_state);
1067 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1068 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1069 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1070 &cached_state, GFP_NOFS);
1072 if (i_done != page_cnt) {
1073 spin_lock(&BTRFS_I(inode)->lock);
1074 BTRFS_I(inode)->outstanding_extents++;
1075 spin_unlock(&BTRFS_I(inode)->lock);
1076 btrfs_delalloc_release_space(inode,
1077 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1081 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1082 &cached_state, GFP_NOFS);
1084 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1085 page_start, page_end - 1, &cached_state,
1088 for (i = 0; i < i_done; i++) {
1089 clear_page_dirty_for_io(pages[i]);
1090 ClearPageChecked(pages[i]);
1091 set_page_extent_mapped(pages[i]);
1092 set_page_dirty(pages[i]);
1093 unlock_page(pages[i]);
1094 page_cache_release(pages[i]);
1098 for (i = 0; i < i_done; i++) {
1099 unlock_page(pages[i]);
1100 page_cache_release(pages[i]);
1102 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
1107 int btrfs_defrag_file(struct inode *inode, struct file *file,
1108 struct btrfs_ioctl_defrag_range_args *range,
1109 u64 newer_than, unsigned long max_to_defrag)
1111 struct btrfs_root *root = BTRFS_I(inode)->root;
1112 struct file_ra_state *ra = NULL;
1113 unsigned long last_index;
1114 u64 isize = i_size_read(inode);
1118 u64 newer_off = range->start;
1120 unsigned long ra_index = 0;
1122 int defrag_count = 0;
1123 int compress_type = BTRFS_COMPRESS_ZLIB;
1124 int extent_thresh = range->extent_thresh;
1125 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1126 int cluster = max_cluster;
1127 u64 new_align = ~((u64)128 * 1024 - 1);
1128 struct page **pages = NULL;
1130 if (extent_thresh == 0)
1131 extent_thresh = 256 * 1024;
1133 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1134 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1136 if (range->compress_type)
1137 compress_type = range->compress_type;
1144 * if we were not given a file, allocate a readahead
1148 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1151 file_ra_state_init(ra, inode->i_mapping);
1156 pages = kmalloc(sizeof(struct page *) * max_cluster,
1163 /* find the last page to defrag */
1164 if (range->start + range->len > range->start) {
1165 last_index = min_t(u64, isize - 1,
1166 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1168 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1172 ret = find_new_extents(root, inode, newer_than,
1173 &newer_off, 64 * 1024);
1175 range->start = newer_off;
1177 * we always align our defrag to help keep
1178 * the extents in the file evenly spaced
1180 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1184 i = range->start >> PAGE_CACHE_SHIFT;
1187 max_to_defrag = last_index + 1;
1190 * make writeback starts from i, so the defrag range can be
1191 * written sequentially.
1193 if (i < inode->i_mapping->writeback_index)
1194 inode->i_mapping->writeback_index = i;
1196 while (i <= last_index && defrag_count < max_to_defrag &&
1197 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1198 PAGE_CACHE_SHIFT)) {
1200 * make sure we stop running if someone unmounts
1203 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1206 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1207 extent_thresh, &last_len, &skip,
1208 &defrag_end, range->flags &
1209 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1212 * the should_defrag function tells us how much to skip
1213 * bump our counter by the suggested amount
1215 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1216 i = max(i + 1, next);
1221 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1222 PAGE_CACHE_SHIFT) - i;
1223 cluster = min(cluster, max_cluster);
1225 cluster = max_cluster;
1228 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1229 BTRFS_I(inode)->force_compress = compress_type;
1231 if (i + cluster > ra_index) {
1232 ra_index = max(i, ra_index);
1233 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1235 ra_index += max_cluster;
1238 mutex_lock(&inode->i_mutex);
1239 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1241 mutex_unlock(&inode->i_mutex);
1245 defrag_count += ret;
1246 balance_dirty_pages_ratelimited(inode->i_mapping);
1247 mutex_unlock(&inode->i_mutex);
1250 if (newer_off == (u64)-1)
1256 newer_off = max(newer_off + 1,
1257 (u64)i << PAGE_CACHE_SHIFT);
1259 ret = find_new_extents(root, inode,
1260 newer_than, &newer_off,
1263 range->start = newer_off;
1264 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1271 last_len += ret << PAGE_CACHE_SHIFT;
1279 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1280 filemap_flush(inode->i_mapping);
1282 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1283 /* the filemap_flush will queue IO into the worker threads, but
1284 * we have to make sure the IO is actually started and that
1285 * ordered extents get created before we return
1287 atomic_inc(&root->fs_info->async_submit_draining);
1288 while (atomic_read(&root->fs_info->nr_async_submits) ||
1289 atomic_read(&root->fs_info->async_delalloc_pages)) {
1290 wait_event(root->fs_info->async_submit_wait,
1291 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1292 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1294 atomic_dec(&root->fs_info->async_submit_draining);
1296 mutex_lock(&inode->i_mutex);
1297 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1298 mutex_unlock(&inode->i_mutex);
1301 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1302 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1314 static noinline int btrfs_ioctl_resize(struct file *file,
1320 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
1321 struct btrfs_ioctl_vol_args *vol_args;
1322 struct btrfs_trans_handle *trans;
1323 struct btrfs_device *device = NULL;
1325 char *devstr = NULL;
1329 if (root->fs_info->sb->s_flags & MS_RDONLY)
1332 if (!capable(CAP_SYS_ADMIN))
1335 ret = mnt_want_write_file(file);
1339 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1341 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
1342 mnt_drop_write_file(file);
1346 mutex_lock(&root->fs_info->volume_mutex);
1347 vol_args = memdup_user(arg, sizeof(*vol_args));
1348 if (IS_ERR(vol_args)) {
1349 ret = PTR_ERR(vol_args);
1353 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1355 sizestr = vol_args->name;
1356 devstr = strchr(sizestr, ':');
1359 sizestr = devstr + 1;
1361 devstr = vol_args->name;
1362 devid = simple_strtoull(devstr, &end, 10);
1363 printk(KERN_INFO "btrfs: resizing devid %llu\n",
1364 (unsigned long long)devid);
1367 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1369 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
1370 (unsigned long long)devid);
1375 if (!device->writeable) {
1376 printk(KERN_INFO "btrfs: resizer unable to apply on "
1377 "readonly device %llu\n",
1378 (unsigned long long)devid);
1383 if (!strcmp(sizestr, "max"))
1384 new_size = device->bdev->bd_inode->i_size;
1386 if (sizestr[0] == '-') {
1389 } else if (sizestr[0] == '+') {
1393 new_size = memparse(sizestr, NULL);
1394 if (new_size == 0) {
1400 if (device->is_tgtdev_for_dev_replace) {
1405 old_size = device->total_bytes;
1408 if (new_size > old_size) {
1412 new_size = old_size - new_size;
1413 } else if (mod > 0) {
1414 new_size = old_size + new_size;
1417 if (new_size < 256 * 1024 * 1024) {
1421 if (new_size > device->bdev->bd_inode->i_size) {
1426 do_div(new_size, root->sectorsize);
1427 new_size *= root->sectorsize;
1429 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1430 rcu_str_deref(device->name),
1431 (unsigned long long)new_size);
1433 if (new_size > old_size) {
1434 trans = btrfs_start_transaction(root, 0);
1435 if (IS_ERR(trans)) {
1436 ret = PTR_ERR(trans);
1439 ret = btrfs_grow_device(trans, device, new_size);
1440 btrfs_commit_transaction(trans, root);
1441 } else if (new_size < old_size) {
1442 ret = btrfs_shrink_device(device, new_size);
1443 } /* equal, nothing need to do */
1448 mutex_unlock(&root->fs_info->volume_mutex);
1449 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1450 mnt_drop_write_file(file);
1454 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1455 char *name, unsigned long fd, int subvol,
1456 u64 *transid, bool readonly,
1457 struct btrfs_qgroup_inherit **inherit)
1462 ret = mnt_want_write_file(file);
1466 namelen = strlen(name);
1467 if (strchr(name, '/')) {
1469 goto out_drop_write;
1472 if (name[0] == '.' &&
1473 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1475 goto out_drop_write;
1479 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1480 NULL, transid, readonly, inherit);
1482 struct fd src = fdget(fd);
1483 struct inode *src_inode;
1486 goto out_drop_write;
1489 src_inode = src.file->f_path.dentry->d_inode;
1490 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
1491 printk(KERN_INFO "btrfs: Snapshot src from "
1495 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1496 BTRFS_I(src_inode)->root,
1497 transid, readonly, inherit);
1502 mnt_drop_write_file(file);
1507 static noinline int btrfs_ioctl_snap_create(struct file *file,
1508 void __user *arg, int subvol)
1510 struct btrfs_ioctl_vol_args *vol_args;
1513 vol_args = memdup_user(arg, sizeof(*vol_args));
1514 if (IS_ERR(vol_args))
1515 return PTR_ERR(vol_args);
1516 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1518 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1519 vol_args->fd, subvol,
1526 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1527 void __user *arg, int subvol)
1529 struct btrfs_ioctl_vol_args_v2 *vol_args;
1533 bool readonly = false;
1534 struct btrfs_qgroup_inherit *inherit = NULL;
1536 vol_args = memdup_user(arg, sizeof(*vol_args));
1537 if (IS_ERR(vol_args))
1538 return PTR_ERR(vol_args);
1539 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1541 if (vol_args->flags &
1542 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1543 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1548 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1550 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1552 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1553 if (vol_args->size > PAGE_CACHE_SIZE) {
1557 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1558 if (IS_ERR(inherit)) {
1559 ret = PTR_ERR(inherit);
1564 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1565 vol_args->fd, subvol, ptr,
1566 readonly, &inherit);
1568 if (ret == 0 && ptr &&
1570 offsetof(struct btrfs_ioctl_vol_args_v2,
1571 transid), ptr, sizeof(*ptr)))
1579 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1582 struct inode *inode = fdentry(file)->d_inode;
1583 struct btrfs_root *root = BTRFS_I(inode)->root;
1587 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1590 down_read(&root->fs_info->subvol_sem);
1591 if (btrfs_root_readonly(root))
1592 flags |= BTRFS_SUBVOL_RDONLY;
1593 up_read(&root->fs_info->subvol_sem);
1595 if (copy_to_user(arg, &flags, sizeof(flags)))
1601 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1604 struct inode *inode = fdentry(file)->d_inode;
1605 struct btrfs_root *root = BTRFS_I(inode)->root;
1606 struct btrfs_trans_handle *trans;
1611 ret = mnt_want_write_file(file);
1615 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1617 goto out_drop_write;
1620 if (copy_from_user(&flags, arg, sizeof(flags))) {
1622 goto out_drop_write;
1625 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1627 goto out_drop_write;
1630 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1632 goto out_drop_write;
1635 if (!inode_owner_or_capable(inode)) {
1637 goto out_drop_write;
1640 down_write(&root->fs_info->subvol_sem);
1643 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1646 root_flags = btrfs_root_flags(&root->root_item);
1647 if (flags & BTRFS_SUBVOL_RDONLY)
1648 btrfs_set_root_flags(&root->root_item,
1649 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1651 btrfs_set_root_flags(&root->root_item,
1652 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1654 trans = btrfs_start_transaction(root, 1);
1655 if (IS_ERR(trans)) {
1656 ret = PTR_ERR(trans);
1660 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1661 &root->root_key, &root->root_item);
1663 btrfs_commit_transaction(trans, root);
1666 btrfs_set_root_flags(&root->root_item, root_flags);
1668 up_write(&root->fs_info->subvol_sem);
1670 mnt_drop_write_file(file);
1676 * helper to check if the subvolume references other subvolumes
1678 static noinline int may_destroy_subvol(struct btrfs_root *root)
1680 struct btrfs_path *path;
1681 struct btrfs_key key;
1684 path = btrfs_alloc_path();
1688 key.objectid = root->root_key.objectid;
1689 key.type = BTRFS_ROOT_REF_KEY;
1690 key.offset = (u64)-1;
1692 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1699 if (path->slots[0] > 0) {
1701 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1702 if (key.objectid == root->root_key.objectid &&
1703 key.type == BTRFS_ROOT_REF_KEY)
1707 btrfs_free_path(path);
1711 static noinline int key_in_sk(struct btrfs_key *key,
1712 struct btrfs_ioctl_search_key *sk)
1714 struct btrfs_key test;
1717 test.objectid = sk->min_objectid;
1718 test.type = sk->min_type;
1719 test.offset = sk->min_offset;
1721 ret = btrfs_comp_cpu_keys(key, &test);
1725 test.objectid = sk->max_objectid;
1726 test.type = sk->max_type;
1727 test.offset = sk->max_offset;
1729 ret = btrfs_comp_cpu_keys(key, &test);
1735 static noinline int copy_to_sk(struct btrfs_root *root,
1736 struct btrfs_path *path,
1737 struct btrfs_key *key,
1738 struct btrfs_ioctl_search_key *sk,
1740 unsigned long *sk_offset,
1744 struct extent_buffer *leaf;
1745 struct btrfs_ioctl_search_header sh;
1746 unsigned long item_off;
1747 unsigned long item_len;
1753 leaf = path->nodes[0];
1754 slot = path->slots[0];
1755 nritems = btrfs_header_nritems(leaf);
1757 if (btrfs_header_generation(leaf) > sk->max_transid) {
1761 found_transid = btrfs_header_generation(leaf);
1763 for (i = slot; i < nritems; i++) {
1764 item_off = btrfs_item_ptr_offset(leaf, i);
1765 item_len = btrfs_item_size_nr(leaf, i);
1767 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1770 if (sizeof(sh) + item_len + *sk_offset >
1771 BTRFS_SEARCH_ARGS_BUFSIZE) {
1776 btrfs_item_key_to_cpu(leaf, key, i);
1777 if (!key_in_sk(key, sk))
1780 sh.objectid = key->objectid;
1781 sh.offset = key->offset;
1782 sh.type = key->type;
1784 sh.transid = found_transid;
1786 /* copy search result header */
1787 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1788 *sk_offset += sizeof(sh);
1791 char *p = buf + *sk_offset;
1793 read_extent_buffer(leaf, p,
1794 item_off, item_len);
1795 *sk_offset += item_len;
1799 if (*num_found >= sk->nr_items)
1804 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1806 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1809 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1819 static noinline int search_ioctl(struct inode *inode,
1820 struct btrfs_ioctl_search_args *args)
1822 struct btrfs_root *root;
1823 struct btrfs_key key;
1824 struct btrfs_key max_key;
1825 struct btrfs_path *path;
1826 struct btrfs_ioctl_search_key *sk = &args->key;
1827 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1830 unsigned long sk_offset = 0;
1832 path = btrfs_alloc_path();
1836 if (sk->tree_id == 0) {
1837 /* search the root of the inode that was passed */
1838 root = BTRFS_I(inode)->root;
1840 key.objectid = sk->tree_id;
1841 key.type = BTRFS_ROOT_ITEM_KEY;
1842 key.offset = (u64)-1;
1843 root = btrfs_read_fs_root_no_name(info, &key);
1845 printk(KERN_ERR "could not find root %llu\n",
1847 btrfs_free_path(path);
1852 key.objectid = sk->min_objectid;
1853 key.type = sk->min_type;
1854 key.offset = sk->min_offset;
1856 max_key.objectid = sk->max_objectid;
1857 max_key.type = sk->max_type;
1858 max_key.offset = sk->max_offset;
1860 path->keep_locks = 1;
1863 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1870 ret = copy_to_sk(root, path, &key, sk, args->buf,
1871 &sk_offset, &num_found);
1872 btrfs_release_path(path);
1873 if (ret || num_found >= sk->nr_items)
1879 sk->nr_items = num_found;
1880 btrfs_free_path(path);
1884 static noinline int btrfs_ioctl_tree_search(struct file *file,
1887 struct btrfs_ioctl_search_args *args;
1888 struct inode *inode;
1891 if (!capable(CAP_SYS_ADMIN))
1894 args = memdup_user(argp, sizeof(*args));
1896 return PTR_ERR(args);
1898 inode = fdentry(file)->d_inode;
1899 ret = search_ioctl(inode, args);
1900 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1907 * Search INODE_REFs to identify path name of 'dirid' directory
1908 * in a 'tree_id' tree. and sets path name to 'name'.
1910 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1911 u64 tree_id, u64 dirid, char *name)
1913 struct btrfs_root *root;
1914 struct btrfs_key key;
1920 struct btrfs_inode_ref *iref;
1921 struct extent_buffer *l;
1922 struct btrfs_path *path;
1924 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1929 path = btrfs_alloc_path();
1933 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1935 key.objectid = tree_id;
1936 key.type = BTRFS_ROOT_ITEM_KEY;
1937 key.offset = (u64)-1;
1938 root = btrfs_read_fs_root_no_name(info, &key);
1940 printk(KERN_ERR "could not find root %llu\n", tree_id);
1945 key.objectid = dirid;
1946 key.type = BTRFS_INODE_REF_KEY;
1947 key.offset = (u64)-1;
1950 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1955 slot = path->slots[0];
1956 if (ret > 0 && slot > 0)
1958 btrfs_item_key_to_cpu(l, &key, slot);
1960 if (ret > 0 && (key.objectid != dirid ||
1961 key.type != BTRFS_INODE_REF_KEY)) {
1966 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1967 len = btrfs_inode_ref_name_len(l, iref);
1969 total_len += len + 1;
1974 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1976 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1979 btrfs_release_path(path);
1980 key.objectid = key.offset;
1981 key.offset = (u64)-1;
1982 dirid = key.objectid;
1986 memmove(name, ptr, total_len);
1987 name[total_len]='\0';
1990 btrfs_free_path(path);
1994 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1997 struct btrfs_ioctl_ino_lookup_args *args;
1998 struct inode *inode;
2001 if (!capable(CAP_SYS_ADMIN))
2004 args = memdup_user(argp, sizeof(*args));
2006 return PTR_ERR(args);
2008 inode = fdentry(file)->d_inode;
2010 if (args->treeid == 0)
2011 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2013 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2014 args->treeid, args->objectid,
2017 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2024 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2027 struct dentry *parent = fdentry(file);
2028 struct dentry *dentry;
2029 struct inode *dir = parent->d_inode;
2030 struct inode *inode;
2031 struct btrfs_root *root = BTRFS_I(dir)->root;
2032 struct btrfs_root *dest = NULL;
2033 struct btrfs_ioctl_vol_args *vol_args;
2034 struct btrfs_trans_handle *trans;
2039 vol_args = memdup_user(arg, sizeof(*vol_args));
2040 if (IS_ERR(vol_args))
2041 return PTR_ERR(vol_args);
2043 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2044 namelen = strlen(vol_args->name);
2045 if (strchr(vol_args->name, '/') ||
2046 strncmp(vol_args->name, "..", namelen) == 0) {
2051 err = mnt_want_write_file(file);
2055 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
2056 dentry = lookup_one_len(vol_args->name, parent, namelen);
2057 if (IS_ERR(dentry)) {
2058 err = PTR_ERR(dentry);
2059 goto out_unlock_dir;
2062 if (!dentry->d_inode) {
2067 inode = dentry->d_inode;
2068 dest = BTRFS_I(inode)->root;
2069 if (!capable(CAP_SYS_ADMIN)){
2071 * Regular user. Only allow this with a special mount
2072 * option, when the user has write+exec access to the
2073 * subvol root, and when rmdir(2) would have been
2076 * Note that this is _not_ check that the subvol is
2077 * empty or doesn't contain data that we wouldn't
2078 * otherwise be able to delete.
2080 * Users who want to delete empty subvols should try
2084 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2088 * Do not allow deletion if the parent dir is the same
2089 * as the dir to be deleted. That means the ioctl
2090 * must be called on the dentry referencing the root
2091 * of the subvol, not a random directory contained
2098 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2103 /* check if subvolume may be deleted by a user */
2104 err = btrfs_may_delete(dir, dentry, 1);
2108 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2113 mutex_lock(&inode->i_mutex);
2114 err = d_invalidate(dentry);
2118 down_write(&root->fs_info->subvol_sem);
2120 err = may_destroy_subvol(dest);
2124 trans = btrfs_start_transaction(root, 0);
2125 if (IS_ERR(trans)) {
2126 err = PTR_ERR(trans);
2129 trans->block_rsv = &root->fs_info->global_block_rsv;
2131 ret = btrfs_unlink_subvol(trans, root, dir,
2132 dest->root_key.objectid,
2133 dentry->d_name.name,
2134 dentry->d_name.len);
2137 btrfs_abort_transaction(trans, root, ret);
2141 btrfs_record_root_in_trans(trans, dest);
2143 memset(&dest->root_item.drop_progress, 0,
2144 sizeof(dest->root_item.drop_progress));
2145 dest->root_item.drop_level = 0;
2146 btrfs_set_root_refs(&dest->root_item, 0);
2148 if (!xchg(&dest->orphan_item_inserted, 1)) {
2149 ret = btrfs_insert_orphan_item(trans,
2150 root->fs_info->tree_root,
2151 dest->root_key.objectid);
2153 btrfs_abort_transaction(trans, root, ret);
2159 ret = btrfs_end_transaction(trans, root);
2162 inode->i_flags |= S_DEAD;
2164 up_write(&root->fs_info->subvol_sem);
2166 mutex_unlock(&inode->i_mutex);
2168 shrink_dcache_sb(root->fs_info->sb);
2169 btrfs_invalidate_inodes(dest);
2175 mutex_unlock(&dir->i_mutex);
2176 mnt_drop_write_file(file);
2182 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2184 struct inode *inode = fdentry(file)->d_inode;
2185 struct btrfs_root *root = BTRFS_I(inode)->root;
2186 struct btrfs_ioctl_defrag_range_args *range;
2189 ret = mnt_want_write_file(file);
2193 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2195 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2196 mnt_drop_write_file(file);
2200 if (btrfs_root_readonly(root)) {
2205 switch (inode->i_mode & S_IFMT) {
2207 if (!capable(CAP_SYS_ADMIN)) {
2211 ret = btrfs_defrag_root(root, 0);
2214 ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
2217 if (!(file->f_mode & FMODE_WRITE)) {
2222 range = kzalloc(sizeof(*range), GFP_KERNEL);
2229 if (copy_from_user(range, argp,
2235 /* compression requires us to start the IO */
2236 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2237 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2238 range->extent_thresh = (u32)-1;
2241 /* the rest are all set to zero by kzalloc */
2242 range->len = (u64)-1;
2244 ret = btrfs_defrag_file(fdentry(file)->d_inode, file,
2254 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2255 mnt_drop_write_file(file);
2259 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2261 struct btrfs_ioctl_vol_args *vol_args;
2264 if (!capable(CAP_SYS_ADMIN))
2267 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2269 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2273 mutex_lock(&root->fs_info->volume_mutex);
2274 vol_args = memdup_user(arg, sizeof(*vol_args));
2275 if (IS_ERR(vol_args)) {
2276 ret = PTR_ERR(vol_args);
2280 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2281 ret = btrfs_init_new_device(root, vol_args->name);
2285 mutex_unlock(&root->fs_info->volume_mutex);
2286 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2290 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2292 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
2293 struct btrfs_ioctl_vol_args *vol_args;
2296 if (!capable(CAP_SYS_ADMIN))
2299 ret = mnt_want_write_file(file);
2303 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2305 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2306 mnt_drop_write_file(file);
2310 mutex_lock(&root->fs_info->volume_mutex);
2311 vol_args = memdup_user(arg, sizeof(*vol_args));
2312 if (IS_ERR(vol_args)) {
2313 ret = PTR_ERR(vol_args);
2317 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2318 ret = btrfs_rm_device(root, vol_args->name);
2322 mutex_unlock(&root->fs_info->volume_mutex);
2323 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2324 mnt_drop_write_file(file);
2328 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2330 struct btrfs_ioctl_fs_info_args *fi_args;
2331 struct btrfs_device *device;
2332 struct btrfs_device *next;
2333 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2336 if (!capable(CAP_SYS_ADMIN))
2339 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2343 fi_args->num_devices = fs_devices->num_devices;
2344 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2346 mutex_lock(&fs_devices->device_list_mutex);
2347 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2348 if (device->devid > fi_args->max_id)
2349 fi_args->max_id = device->devid;
2351 mutex_unlock(&fs_devices->device_list_mutex);
2353 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2360 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2362 struct btrfs_ioctl_dev_info_args *di_args;
2363 struct btrfs_device *dev;
2364 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2366 char *s_uuid = NULL;
2367 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2369 if (!capable(CAP_SYS_ADMIN))
2372 di_args = memdup_user(arg, sizeof(*di_args));
2373 if (IS_ERR(di_args))
2374 return PTR_ERR(di_args);
2376 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2377 s_uuid = di_args->uuid;
2379 mutex_lock(&fs_devices->device_list_mutex);
2380 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2381 mutex_unlock(&fs_devices->device_list_mutex);
2388 di_args->devid = dev->devid;
2389 di_args->bytes_used = dev->bytes_used;
2390 di_args->total_bytes = dev->total_bytes;
2391 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2393 struct rcu_string *name;
2396 name = rcu_dereference(dev->name);
2397 strncpy(di_args->path, name->str, sizeof(di_args->path));
2399 di_args->path[sizeof(di_args->path) - 1] = 0;
2401 di_args->path[0] = '\0';
2405 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2412 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2413 u64 off, u64 olen, u64 destoff)
2415 struct inode *inode = fdentry(file)->d_inode;
2416 struct btrfs_root *root = BTRFS_I(inode)->root;
2419 struct btrfs_trans_handle *trans;
2420 struct btrfs_path *path;
2421 struct extent_buffer *leaf;
2423 struct btrfs_key key;
2428 u64 bs = root->fs_info->sb->s_blocksize;
2432 * - split compressed inline extents. annoying: we need to
2433 * decompress into destination's address_space (the file offset
2434 * may change, so source mapping won't do), then recompress (or
2435 * otherwise reinsert) a subrange.
2436 * - allow ranges within the same file to be cloned (provided
2437 * they don't overlap)?
2440 /* the destination must be opened for writing */
2441 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
2444 if (btrfs_root_readonly(root))
2447 ret = mnt_want_write_file(file);
2451 src_file = fdget(srcfd);
2452 if (!src_file.file) {
2454 goto out_drop_write;
2458 if (src_file.file->f_path.mnt != file->f_path.mnt)
2461 src = src_file.file->f_dentry->d_inode;
2467 /* the src must be open for reading */
2468 if (!(src_file.file->f_mode & FMODE_READ))
2471 /* don't make the dst file partly checksummed */
2472 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2473 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2477 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2481 if (src->i_sb != inode->i_sb)
2485 buf = vmalloc(btrfs_level_size(root, 0));
2489 path = btrfs_alloc_path();
2497 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2498 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
2500 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2501 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2504 /* determine range to clone */
2506 if (off + len > src->i_size || off + len < off)
2509 olen = len = src->i_size - off;
2510 /* if we extend to eof, continue to block boundary */
2511 if (off + len == src->i_size)
2512 len = ALIGN(src->i_size, bs) - off;
2514 /* verify the end result is block aligned */
2515 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2516 !IS_ALIGNED(destoff, bs))
2519 if (destoff > inode->i_size) {
2520 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2525 /* truncate page cache pages from target inode range */
2526 truncate_inode_pages_range(&inode->i_data, destoff,
2527 PAGE_CACHE_ALIGN(destoff + len) - 1);
2529 /* do any pending delalloc/csum calc on src, one way or
2530 another, and lock file content */
2532 struct btrfs_ordered_extent *ordered;
2533 lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2534 ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
2536 !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
2537 EXTENT_DELALLOC, 0, NULL))
2539 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2541 btrfs_put_ordered_extent(ordered);
2542 btrfs_wait_ordered_range(src, off, len);
2546 key.objectid = btrfs_ino(src);
2547 key.type = BTRFS_EXTENT_DATA_KEY;
2552 * note the key will change type as we walk through the
2555 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2560 nritems = btrfs_header_nritems(path->nodes[0]);
2561 if (path->slots[0] >= nritems) {
2562 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
2567 nritems = btrfs_header_nritems(path->nodes[0]);
2569 leaf = path->nodes[0];
2570 slot = path->slots[0];
2572 btrfs_item_key_to_cpu(leaf, &key, slot);
2573 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
2574 key.objectid != btrfs_ino(src))
2577 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2578 struct btrfs_file_extent_item *extent;
2581 struct btrfs_key new_key;
2582 u64 disko = 0, diskl = 0;
2583 u64 datao = 0, datal = 0;
2587 size = btrfs_item_size_nr(leaf, slot);
2588 read_extent_buffer(leaf, buf,
2589 btrfs_item_ptr_offset(leaf, slot),
2592 extent = btrfs_item_ptr(leaf, slot,
2593 struct btrfs_file_extent_item);
2594 comp = btrfs_file_extent_compression(leaf, extent);
2595 type = btrfs_file_extent_type(leaf, extent);
2596 if (type == BTRFS_FILE_EXTENT_REG ||
2597 type == BTRFS_FILE_EXTENT_PREALLOC) {
2598 disko = btrfs_file_extent_disk_bytenr(leaf,
2600 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2602 datao = btrfs_file_extent_offset(leaf, extent);
2603 datal = btrfs_file_extent_num_bytes(leaf,
2605 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2606 /* take upper bound, may be compressed */
2607 datal = btrfs_file_extent_ram_bytes(leaf,
2610 btrfs_release_path(path);
2612 if (key.offset + datal <= off ||
2613 key.offset >= off + len - 1)
2616 memcpy(&new_key, &key, sizeof(new_key));
2617 new_key.objectid = btrfs_ino(inode);
2618 if (off <= key.offset)
2619 new_key.offset = key.offset + destoff - off;
2621 new_key.offset = destoff;
2624 * 1 - adjusting old extent (we may have to split it)
2625 * 1 - add new extent
2628 trans = btrfs_start_transaction(root, 3);
2629 if (IS_ERR(trans)) {
2630 ret = PTR_ERR(trans);
2634 if (type == BTRFS_FILE_EXTENT_REG ||
2635 type == BTRFS_FILE_EXTENT_PREALLOC) {
2637 * a | --- range to clone ---| b
2638 * | ------------- extent ------------- |
2641 /* substract range b */
2642 if (key.offset + datal > off + len)
2643 datal = off + len - key.offset;
2645 /* substract range a */
2646 if (off > key.offset) {
2647 datao += off - key.offset;
2648 datal -= off - key.offset;
2651 ret = btrfs_drop_extents(trans, root, inode,
2653 new_key.offset + datal,
2656 btrfs_abort_transaction(trans, root,
2658 btrfs_end_transaction(trans, root);
2662 ret = btrfs_insert_empty_item(trans, root, path,
2665 btrfs_abort_transaction(trans, root,
2667 btrfs_end_transaction(trans, root);
2671 leaf = path->nodes[0];
2672 slot = path->slots[0];
2673 write_extent_buffer(leaf, buf,
2674 btrfs_item_ptr_offset(leaf, slot),
2677 extent = btrfs_item_ptr(leaf, slot,
2678 struct btrfs_file_extent_item);
2680 /* disko == 0 means it's a hole */
2684 btrfs_set_file_extent_offset(leaf, extent,
2686 btrfs_set_file_extent_num_bytes(leaf, extent,
2689 inode_add_bytes(inode, datal);
2690 ret = btrfs_inc_extent_ref(trans, root,
2692 root->root_key.objectid,
2694 new_key.offset - datao,
2697 btrfs_abort_transaction(trans,
2700 btrfs_end_transaction(trans,
2706 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2709 if (off > key.offset) {
2710 skip = off - key.offset;
2711 new_key.offset += skip;
2714 if (key.offset + datal > off + len)
2715 trim = key.offset + datal - (off + len);
2717 if (comp && (skip || trim)) {
2719 btrfs_end_transaction(trans, root);
2722 size -= skip + trim;
2723 datal -= skip + trim;
2725 ret = btrfs_drop_extents(trans, root, inode,
2727 new_key.offset + datal,
2730 btrfs_abort_transaction(trans, root,
2732 btrfs_end_transaction(trans, root);
2736 ret = btrfs_insert_empty_item(trans, root, path,
2739 btrfs_abort_transaction(trans, root,
2741 btrfs_end_transaction(trans, root);
2747 btrfs_file_extent_calc_inline_size(0);
2748 memmove(buf+start, buf+start+skip,
2752 leaf = path->nodes[0];
2753 slot = path->slots[0];
2754 write_extent_buffer(leaf, buf,
2755 btrfs_item_ptr_offset(leaf, slot),
2757 inode_add_bytes(inode, datal);
2760 btrfs_mark_buffer_dirty(leaf);
2761 btrfs_release_path(path);
2763 inode_inc_iversion(inode);
2764 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2767 * we round up to the block size at eof when
2768 * determining which extents to clone above,
2769 * but shouldn't round up the file size
2771 endoff = new_key.offset + datal;
2772 if (endoff > destoff+olen)
2773 endoff = destoff+olen;
2774 if (endoff > inode->i_size)
2775 btrfs_i_size_write(inode, endoff);
2777 ret = btrfs_update_inode(trans, root, inode);
2779 btrfs_abort_transaction(trans, root, ret);
2780 btrfs_end_transaction(trans, root);
2783 ret = btrfs_end_transaction(trans, root);
2786 btrfs_release_path(path);
2791 btrfs_release_path(path);
2792 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2794 mutex_unlock(&src->i_mutex);
2795 mutex_unlock(&inode->i_mutex);
2797 btrfs_free_path(path);
2801 mnt_drop_write_file(file);
2805 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
2807 struct btrfs_ioctl_clone_range_args args;
2809 if (copy_from_user(&args, argp, sizeof(args)))
2811 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2812 args.src_length, args.dest_offset);
2816 * there are many ways the trans_start and trans_end ioctls can lead
2817 * to deadlocks. They should only be used by applications that
2818 * basically own the machine, and have a very in depth understanding
2819 * of all the possible deadlocks and enospc problems.
2821 static long btrfs_ioctl_trans_start(struct file *file)
2823 struct inode *inode = fdentry(file)->d_inode;
2824 struct btrfs_root *root = BTRFS_I(inode)->root;
2825 struct btrfs_trans_handle *trans;
2829 if (!capable(CAP_SYS_ADMIN))
2833 if (file->private_data)
2837 if (btrfs_root_readonly(root))
2840 ret = mnt_want_write_file(file);
2844 atomic_inc(&root->fs_info->open_ioctl_trans);
2847 trans = btrfs_start_ioctl_transaction(root);
2851 file->private_data = trans;
2855 atomic_dec(&root->fs_info->open_ioctl_trans);
2856 mnt_drop_write_file(file);
2861 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2863 struct inode *inode = fdentry(file)->d_inode;
2864 struct btrfs_root *root = BTRFS_I(inode)->root;
2865 struct btrfs_root *new_root;
2866 struct btrfs_dir_item *di;
2867 struct btrfs_trans_handle *trans;
2868 struct btrfs_path *path;
2869 struct btrfs_key location;
2870 struct btrfs_disk_key disk_key;
2875 if (!capable(CAP_SYS_ADMIN))
2878 ret = mnt_want_write_file(file);
2882 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2888 objectid = root->root_key.objectid;
2890 location.objectid = objectid;
2891 location.type = BTRFS_ROOT_ITEM_KEY;
2892 location.offset = (u64)-1;
2894 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
2895 if (IS_ERR(new_root)) {
2896 ret = PTR_ERR(new_root);
2900 if (btrfs_root_refs(&new_root->root_item) == 0) {
2905 path = btrfs_alloc_path();
2910 path->leave_spinning = 1;
2912 trans = btrfs_start_transaction(root, 1);
2913 if (IS_ERR(trans)) {
2914 btrfs_free_path(path);
2915 ret = PTR_ERR(trans);
2919 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
2920 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
2921 dir_id, "default", 7, 1);
2922 if (IS_ERR_OR_NULL(di)) {
2923 btrfs_free_path(path);
2924 btrfs_end_transaction(trans, root);
2925 printk(KERN_ERR "Umm, you don't have the default dir item, "
2926 "this isn't going to work\n");
2931 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2932 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2933 btrfs_mark_buffer_dirty(path->nodes[0]);
2934 btrfs_free_path(path);
2936 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
2937 btrfs_end_transaction(trans, root);
2939 mnt_drop_write_file(file);
2943 void btrfs_get_block_group_info(struct list_head *groups_list,
2944 struct btrfs_ioctl_space_info *space)
2946 struct btrfs_block_group_cache *block_group;
2948 space->total_bytes = 0;
2949 space->used_bytes = 0;
2951 list_for_each_entry(block_group, groups_list, list) {
2952 space->flags = block_group->flags;
2953 space->total_bytes += block_group->key.offset;
2954 space->used_bytes +=
2955 btrfs_block_group_used(&block_group->item);
2959 long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
2961 struct btrfs_ioctl_space_args space_args;
2962 struct btrfs_ioctl_space_info space;
2963 struct btrfs_ioctl_space_info *dest;
2964 struct btrfs_ioctl_space_info *dest_orig;
2965 struct btrfs_ioctl_space_info __user *user_dest;
2966 struct btrfs_space_info *info;
2967 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
2968 BTRFS_BLOCK_GROUP_SYSTEM,
2969 BTRFS_BLOCK_GROUP_METADATA,
2970 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
2977 if (copy_from_user(&space_args,
2978 (struct btrfs_ioctl_space_args __user *)arg,
2979 sizeof(space_args)))
2982 for (i = 0; i < num_types; i++) {
2983 struct btrfs_space_info *tmp;
2987 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2989 if (tmp->flags == types[i]) {
2999 down_read(&info->groups_sem);
3000 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3001 if (!list_empty(&info->block_groups[c]))
3004 up_read(&info->groups_sem);
3007 /* space_slots == 0 means they are asking for a count */
3008 if (space_args.space_slots == 0) {
3009 space_args.total_spaces = slot_count;
3013 slot_count = min_t(u64, space_args.space_slots, slot_count);
3015 alloc_size = sizeof(*dest) * slot_count;
3017 /* we generally have at most 6 or so space infos, one for each raid
3018 * level. So, a whole page should be more than enough for everyone
3020 if (alloc_size > PAGE_CACHE_SIZE)
3023 space_args.total_spaces = 0;
3024 dest = kmalloc(alloc_size, GFP_NOFS);
3029 /* now we have a buffer to copy into */
3030 for (i = 0; i < num_types; i++) {
3031 struct btrfs_space_info *tmp;
3038 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3040 if (tmp->flags == types[i]) {
3049 down_read(&info->groups_sem);
3050 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3051 if (!list_empty(&info->block_groups[c])) {
3052 btrfs_get_block_group_info(
3053 &info->block_groups[c], &space);
3054 memcpy(dest, &space, sizeof(space));
3056 space_args.total_spaces++;
3062 up_read(&info->groups_sem);
3065 user_dest = (struct btrfs_ioctl_space_info __user *)
3066 (arg + sizeof(struct btrfs_ioctl_space_args));
3068 if (copy_to_user(user_dest, dest_orig, alloc_size))
3073 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3080 * there are many ways the trans_start and trans_end ioctls can lead
3081 * to deadlocks. They should only be used by applications that
3082 * basically own the machine, and have a very in depth understanding
3083 * of all the possible deadlocks and enospc problems.
3085 long btrfs_ioctl_trans_end(struct file *file)
3087 struct inode *inode = fdentry(file)->d_inode;
3088 struct btrfs_root *root = BTRFS_I(inode)->root;
3089 struct btrfs_trans_handle *trans;
3091 trans = file->private_data;
3094 file->private_data = NULL;
3096 btrfs_end_transaction(trans, root);
3098 atomic_dec(&root->fs_info->open_ioctl_trans);
3100 mnt_drop_write_file(file);
3104 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3107 struct btrfs_trans_handle *trans;
3111 trans = btrfs_attach_transaction(root);
3112 if (IS_ERR(trans)) {
3113 if (PTR_ERR(trans) != -ENOENT)
3114 return PTR_ERR(trans);
3116 /* No running transaction, don't bother */
3117 transid = root->fs_info->last_trans_committed;
3120 transid = trans->transid;
3121 ret = btrfs_commit_transaction_async(trans, root, 0);
3123 btrfs_end_transaction(trans, root);
3128 if (copy_to_user(argp, &transid, sizeof(transid)))
3133 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3139 if (copy_from_user(&transid, argp, sizeof(transid)))
3142 transid = 0; /* current trans */
3144 return btrfs_wait_for_commit(root, transid);
3147 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3149 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3150 struct btrfs_ioctl_scrub_args *sa;
3153 if (!capable(CAP_SYS_ADMIN))
3156 sa = memdup_user(arg, sizeof(*sa));
3160 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3161 ret = mnt_want_write_file(file);
3166 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
3167 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3170 if (copy_to_user(arg, sa, sizeof(*sa)))
3173 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3174 mnt_drop_write_file(file);
3180 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3182 if (!capable(CAP_SYS_ADMIN))
3185 return btrfs_scrub_cancel(root->fs_info);
3188 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3191 struct btrfs_ioctl_scrub_args *sa;
3194 if (!capable(CAP_SYS_ADMIN))
3197 sa = memdup_user(arg, sizeof(*sa));
3201 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3203 if (copy_to_user(arg, sa, sizeof(*sa)))
3210 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3213 struct btrfs_ioctl_get_dev_stats *sa;
3216 sa = memdup_user(arg, sizeof(*sa));
3220 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3225 ret = btrfs_get_dev_stats(root, sa);
3227 if (copy_to_user(arg, sa, sizeof(*sa)))
3234 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3236 struct btrfs_ioctl_dev_replace_args *p;
3239 if (!capable(CAP_SYS_ADMIN))
3242 p = memdup_user(arg, sizeof(*p));
3247 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3249 &root->fs_info->mutually_exclusive_operation_running,
3251 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3254 ret = btrfs_dev_replace_start(root, p);
3256 &root->fs_info->mutually_exclusive_operation_running,
3260 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3261 btrfs_dev_replace_status(root->fs_info, p);
3264 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3265 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3272 if (copy_to_user(arg, p, sizeof(*p)))
3279 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3285 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3286 struct inode_fs_paths *ipath = NULL;
3287 struct btrfs_path *path;
3289 if (!capable(CAP_SYS_ADMIN))
3292 path = btrfs_alloc_path();
3298 ipa = memdup_user(arg, sizeof(*ipa));
3305 size = min_t(u32, ipa->size, 4096);
3306 ipath = init_ipath(size, root, path);
3307 if (IS_ERR(ipath)) {
3308 ret = PTR_ERR(ipath);
3313 ret = paths_from_inode(ipa->inum, ipath);
3317 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3318 rel_ptr = ipath->fspath->val[i] -
3319 (u64)(unsigned long)ipath->fspath->val;
3320 ipath->fspath->val[i] = rel_ptr;
3323 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3324 (void *)(unsigned long)ipath->fspath, size);
3331 btrfs_free_path(path);
3338 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3340 struct btrfs_data_container *inodes = ctx;
3341 const size_t c = 3 * sizeof(u64);
3343 if (inodes->bytes_left >= c) {
3344 inodes->bytes_left -= c;
3345 inodes->val[inodes->elem_cnt] = inum;
3346 inodes->val[inodes->elem_cnt + 1] = offset;
3347 inodes->val[inodes->elem_cnt + 2] = root;
3348 inodes->elem_cnt += 3;
3350 inodes->bytes_missing += c - inodes->bytes_left;
3351 inodes->bytes_left = 0;
3352 inodes->elem_missed += 3;
3358 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3363 struct btrfs_ioctl_logical_ino_args *loi;
3364 struct btrfs_data_container *inodes = NULL;
3365 struct btrfs_path *path = NULL;
3367 if (!capable(CAP_SYS_ADMIN))
3370 loi = memdup_user(arg, sizeof(*loi));
3377 path = btrfs_alloc_path();
3383 size = min_t(u32, loi->size, 64 * 1024);
3384 inodes = init_data_container(size);
3385 if (IS_ERR(inodes)) {
3386 ret = PTR_ERR(inodes);
3391 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3392 build_ino_list, inodes);
3398 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3399 (void *)(unsigned long)inodes, size);
3404 btrfs_free_path(path);
3411 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3412 struct btrfs_ioctl_balance_args *bargs)
3414 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3416 bargs->flags = bctl->flags;
3418 if (atomic_read(&fs_info->balance_running))
3419 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3420 if (atomic_read(&fs_info->balance_pause_req))
3421 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3422 if (atomic_read(&fs_info->balance_cancel_req))
3423 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3425 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3426 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3427 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3430 spin_lock(&fs_info->balance_lock);
3431 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3432 spin_unlock(&fs_info->balance_lock);
3434 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3438 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3440 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3441 struct btrfs_fs_info *fs_info = root->fs_info;
3442 struct btrfs_ioctl_balance_args *bargs;
3443 struct btrfs_balance_control *bctl;
3444 bool need_unlock; /* for mut. excl. ops lock */
3447 if (!capable(CAP_SYS_ADMIN))
3450 ret = mnt_want_write_file(file);
3455 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
3456 mutex_lock(&fs_info->volume_mutex);
3457 mutex_lock(&fs_info->balance_mutex);
3463 * mut. excl. ops lock is locked. Three possibilites:
3464 * (1) some other op is running
3465 * (2) balance is running
3466 * (3) balance is paused -- special case (think resume)
3468 mutex_lock(&fs_info->balance_mutex);
3469 if (fs_info->balance_ctl) {
3470 /* this is either (2) or (3) */
3471 if (!atomic_read(&fs_info->balance_running)) {
3472 mutex_unlock(&fs_info->balance_mutex);
3473 if (!mutex_trylock(&fs_info->volume_mutex))
3475 mutex_lock(&fs_info->balance_mutex);
3477 if (fs_info->balance_ctl &&
3478 !atomic_read(&fs_info->balance_running)) {
3480 need_unlock = false;
3484 mutex_unlock(&fs_info->balance_mutex);
3485 mutex_unlock(&fs_info->volume_mutex);
3489 mutex_unlock(&fs_info->balance_mutex);
3495 mutex_unlock(&fs_info->balance_mutex);
3496 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3502 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
3505 bargs = memdup_user(arg, sizeof(*bargs));
3506 if (IS_ERR(bargs)) {
3507 ret = PTR_ERR(bargs);
3511 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3512 if (!fs_info->balance_ctl) {
3517 bctl = fs_info->balance_ctl;
3518 spin_lock(&fs_info->balance_lock);
3519 bctl->flags |= BTRFS_BALANCE_RESUME;
3520 spin_unlock(&fs_info->balance_lock);
3528 if (fs_info->balance_ctl) {
3533 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3539 bctl->fs_info = fs_info;
3541 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3542 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3543 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3545 bctl->flags = bargs->flags;
3547 /* balance everything - no filters */
3548 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
3553 * Ownership of bctl and mutually_exclusive_operation_running
3554 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
3555 * or, if restriper was paused all the way until unmount, in
3556 * free_fs_info. mutually_exclusive_operation_running is
3557 * cleared in __cancel_balance.
3559 need_unlock = false;
3561 ret = btrfs_balance(bctl, bargs);
3564 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3571 mutex_unlock(&fs_info->balance_mutex);
3572 mutex_unlock(&fs_info->volume_mutex);
3574 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3576 mnt_drop_write_file(file);
3580 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3582 if (!capable(CAP_SYS_ADMIN))
3586 case BTRFS_BALANCE_CTL_PAUSE:
3587 return btrfs_pause_balance(root->fs_info);
3588 case BTRFS_BALANCE_CTL_CANCEL:
3589 return btrfs_cancel_balance(root->fs_info);
3595 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3598 struct btrfs_fs_info *fs_info = root->fs_info;
3599 struct btrfs_ioctl_balance_args *bargs;
3602 if (!capable(CAP_SYS_ADMIN))
3605 mutex_lock(&fs_info->balance_mutex);
3606 if (!fs_info->balance_ctl) {
3611 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3617 update_ioctl_balance_args(fs_info, 1, bargs);
3619 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3624 mutex_unlock(&fs_info->balance_mutex);
3628 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
3630 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3631 struct btrfs_ioctl_quota_ctl_args *sa;
3632 struct btrfs_trans_handle *trans = NULL;
3636 if (!capable(CAP_SYS_ADMIN))
3639 ret = mnt_want_write_file(file);
3643 sa = memdup_user(arg, sizeof(*sa));
3649 if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
3650 trans = btrfs_start_transaction(root, 2);
3651 if (IS_ERR(trans)) {
3652 ret = PTR_ERR(trans);
3658 case BTRFS_QUOTA_CTL_ENABLE:
3659 ret = btrfs_quota_enable(trans, root->fs_info);
3661 case BTRFS_QUOTA_CTL_DISABLE:
3662 ret = btrfs_quota_disable(trans, root->fs_info);
3664 case BTRFS_QUOTA_CTL_RESCAN:
3665 ret = btrfs_quota_rescan(root->fs_info);
3672 if (copy_to_user(arg, sa, sizeof(*sa)))
3676 err = btrfs_commit_transaction(trans, root);
3683 mnt_drop_write_file(file);
3687 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
3689 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3690 struct btrfs_ioctl_qgroup_assign_args *sa;
3691 struct btrfs_trans_handle *trans;
3695 if (!capable(CAP_SYS_ADMIN))
3698 ret = mnt_want_write_file(file);
3702 sa = memdup_user(arg, sizeof(*sa));
3708 trans = btrfs_join_transaction(root);
3709 if (IS_ERR(trans)) {
3710 ret = PTR_ERR(trans);
3714 /* FIXME: check if the IDs really exist */
3716 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3719 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3723 err = btrfs_end_transaction(trans, root);
3730 mnt_drop_write_file(file);
3734 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
3736 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3737 struct btrfs_ioctl_qgroup_create_args *sa;
3738 struct btrfs_trans_handle *trans;
3742 if (!capable(CAP_SYS_ADMIN))
3745 ret = mnt_want_write_file(file);
3749 sa = memdup_user(arg, sizeof(*sa));
3755 if (!sa->qgroupid) {
3760 trans = btrfs_join_transaction(root);
3761 if (IS_ERR(trans)) {
3762 ret = PTR_ERR(trans);
3766 /* FIXME: check if the IDs really exist */
3768 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3771 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3774 err = btrfs_end_transaction(trans, root);
3781 mnt_drop_write_file(file);
3785 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
3787 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3788 struct btrfs_ioctl_qgroup_limit_args *sa;
3789 struct btrfs_trans_handle *trans;
3794 if (!capable(CAP_SYS_ADMIN))
3797 ret = mnt_want_write_file(file);
3801 sa = memdup_user(arg, sizeof(*sa));
3807 trans = btrfs_join_transaction(root);
3808 if (IS_ERR(trans)) {
3809 ret = PTR_ERR(trans);
3813 qgroupid = sa->qgroupid;
3815 /* take the current subvol as qgroup */
3816 qgroupid = root->root_key.objectid;
3819 /* FIXME: check if the IDs really exist */
3820 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3822 err = btrfs_end_transaction(trans, root);
3829 mnt_drop_write_file(file);
3833 static long btrfs_ioctl_set_received_subvol(struct file *file,
3836 struct btrfs_ioctl_received_subvol_args *sa = NULL;
3837 struct inode *inode = fdentry(file)->d_inode;
3838 struct btrfs_root *root = BTRFS_I(inode)->root;
3839 struct btrfs_root_item *root_item = &root->root_item;
3840 struct btrfs_trans_handle *trans;
3841 struct timespec ct = CURRENT_TIME;
3844 ret = mnt_want_write_file(file);
3848 down_write(&root->fs_info->subvol_sem);
3850 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
3855 if (btrfs_root_readonly(root)) {
3860 if (!inode_owner_or_capable(inode)) {
3865 sa = memdup_user(arg, sizeof(*sa));
3872 trans = btrfs_start_transaction(root, 1);
3873 if (IS_ERR(trans)) {
3874 ret = PTR_ERR(trans);
3879 sa->rtransid = trans->transid;
3880 sa->rtime.sec = ct.tv_sec;
3881 sa->rtime.nsec = ct.tv_nsec;
3883 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
3884 btrfs_set_root_stransid(root_item, sa->stransid);
3885 btrfs_set_root_rtransid(root_item, sa->rtransid);
3886 root_item->stime.sec = cpu_to_le64(sa->stime.sec);
3887 root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
3888 root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
3889 root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
3891 ret = btrfs_update_root(trans, root->fs_info->tree_root,
3892 &root->root_key, &root->root_item);
3894 btrfs_end_transaction(trans, root);
3898 ret = btrfs_commit_transaction(trans, root);
3903 ret = copy_to_user(arg, sa, sizeof(*sa));
3909 up_write(&root->fs_info->subvol_sem);
3910 mnt_drop_write_file(file);
3914 long btrfs_ioctl(struct file *file, unsigned int
3915 cmd, unsigned long arg)
3917 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3918 void __user *argp = (void __user *)arg;
3921 case FS_IOC_GETFLAGS:
3922 return btrfs_ioctl_getflags(file, argp);
3923 case FS_IOC_SETFLAGS:
3924 return btrfs_ioctl_setflags(file, argp);
3925 case FS_IOC_GETVERSION:
3926 return btrfs_ioctl_getversion(file, argp);
3928 return btrfs_ioctl_fitrim(file, argp);
3929 case BTRFS_IOC_SNAP_CREATE:
3930 return btrfs_ioctl_snap_create(file, argp, 0);
3931 case BTRFS_IOC_SNAP_CREATE_V2:
3932 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3933 case BTRFS_IOC_SUBVOL_CREATE:
3934 return btrfs_ioctl_snap_create(file, argp, 1);
3935 case BTRFS_IOC_SUBVOL_CREATE_V2:
3936 return btrfs_ioctl_snap_create_v2(file, argp, 1);
3937 case BTRFS_IOC_SNAP_DESTROY:
3938 return btrfs_ioctl_snap_destroy(file, argp);
3939 case BTRFS_IOC_SUBVOL_GETFLAGS:
3940 return btrfs_ioctl_subvol_getflags(file, argp);
3941 case BTRFS_IOC_SUBVOL_SETFLAGS:
3942 return btrfs_ioctl_subvol_setflags(file, argp);
3943 case BTRFS_IOC_DEFAULT_SUBVOL:
3944 return btrfs_ioctl_default_subvol(file, argp);
3945 case BTRFS_IOC_DEFRAG:
3946 return btrfs_ioctl_defrag(file, NULL);
3947 case BTRFS_IOC_DEFRAG_RANGE:
3948 return btrfs_ioctl_defrag(file, argp);
3949 case BTRFS_IOC_RESIZE:
3950 return btrfs_ioctl_resize(file, argp);
3951 case BTRFS_IOC_ADD_DEV:
3952 return btrfs_ioctl_add_dev(root, argp);
3953 case BTRFS_IOC_RM_DEV:
3954 return btrfs_ioctl_rm_dev(file, argp);
3955 case BTRFS_IOC_FS_INFO:
3956 return btrfs_ioctl_fs_info(root, argp);
3957 case BTRFS_IOC_DEV_INFO:
3958 return btrfs_ioctl_dev_info(root, argp);
3959 case BTRFS_IOC_BALANCE:
3960 return btrfs_ioctl_balance(file, NULL);
3961 case BTRFS_IOC_CLONE:
3962 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
3963 case BTRFS_IOC_CLONE_RANGE:
3964 return btrfs_ioctl_clone_range(file, argp);
3965 case BTRFS_IOC_TRANS_START:
3966 return btrfs_ioctl_trans_start(file);
3967 case BTRFS_IOC_TRANS_END:
3968 return btrfs_ioctl_trans_end(file);
3969 case BTRFS_IOC_TREE_SEARCH:
3970 return btrfs_ioctl_tree_search(file, argp);
3971 case BTRFS_IOC_INO_LOOKUP:
3972 return btrfs_ioctl_ino_lookup(file, argp);
3973 case BTRFS_IOC_INO_PATHS:
3974 return btrfs_ioctl_ino_to_path(root, argp);
3975 case BTRFS_IOC_LOGICAL_INO:
3976 return btrfs_ioctl_logical_to_ino(root, argp);
3977 case BTRFS_IOC_SPACE_INFO:
3978 return btrfs_ioctl_space_info(root, argp);
3979 case BTRFS_IOC_SYNC:
3980 btrfs_sync_fs(file->f_dentry->d_sb, 1);
3982 case BTRFS_IOC_START_SYNC:
3983 return btrfs_ioctl_start_sync(root, argp);
3984 case BTRFS_IOC_WAIT_SYNC:
3985 return btrfs_ioctl_wait_sync(root, argp);
3986 case BTRFS_IOC_SCRUB:
3987 return btrfs_ioctl_scrub(file, argp);
3988 case BTRFS_IOC_SCRUB_CANCEL:
3989 return btrfs_ioctl_scrub_cancel(root, argp);
3990 case BTRFS_IOC_SCRUB_PROGRESS:
3991 return btrfs_ioctl_scrub_progress(root, argp);
3992 case BTRFS_IOC_BALANCE_V2:
3993 return btrfs_ioctl_balance(file, argp);
3994 case BTRFS_IOC_BALANCE_CTL:
3995 return btrfs_ioctl_balance_ctl(root, arg);
3996 case BTRFS_IOC_BALANCE_PROGRESS:
3997 return btrfs_ioctl_balance_progress(root, argp);
3998 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
3999 return btrfs_ioctl_set_received_subvol(file, argp);
4000 case BTRFS_IOC_SEND:
4001 return btrfs_ioctl_send(file, argp);
4002 case BTRFS_IOC_GET_DEV_STATS:
4003 return btrfs_ioctl_get_dev_stats(root, argp);
4004 case BTRFS_IOC_QUOTA_CTL:
4005 return btrfs_ioctl_quota_ctl(file, argp);
4006 case BTRFS_IOC_QGROUP_ASSIGN:
4007 return btrfs_ioctl_qgroup_assign(file, argp);
4008 case BTRFS_IOC_QGROUP_CREATE:
4009 return btrfs_ioctl_qgroup_create(file, argp);
4010 case BTRFS_IOC_QGROUP_LIMIT:
4011 return btrfs_ioctl_qgroup_limit(file, argp);
4012 case BTRFS_IOC_DEV_REPLACE:
4013 return btrfs_ioctl_dev_replace(root, argp);