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>
47 #include "transaction.h"
48 #include "btrfs_inode.h"
50 #include "print-tree.h"
53 #include "inode-map.h"
55 #include "rcu-string.h"
57 /* Mask out flags that are inappropriate for the given type of inode. */
58 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
62 else if (S_ISREG(mode))
63 return flags & ~FS_DIRSYNC_FL;
65 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
69 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
71 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
73 unsigned int iflags = 0;
75 if (flags & BTRFS_INODE_SYNC)
77 if (flags & BTRFS_INODE_IMMUTABLE)
78 iflags |= FS_IMMUTABLE_FL;
79 if (flags & BTRFS_INODE_APPEND)
80 iflags |= FS_APPEND_FL;
81 if (flags & BTRFS_INODE_NODUMP)
82 iflags |= FS_NODUMP_FL;
83 if (flags & BTRFS_INODE_NOATIME)
84 iflags |= FS_NOATIME_FL;
85 if (flags & BTRFS_INODE_DIRSYNC)
86 iflags |= FS_DIRSYNC_FL;
87 if (flags & BTRFS_INODE_NODATACOW)
88 iflags |= FS_NOCOW_FL;
90 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
91 iflags |= FS_COMPR_FL;
92 else if (flags & BTRFS_INODE_NOCOMPRESS)
93 iflags |= FS_NOCOMP_FL;
99 * Update inode->i_flags based on the btrfs internal flags.
101 void btrfs_update_iflags(struct inode *inode)
103 struct btrfs_inode *ip = BTRFS_I(inode);
105 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
107 if (ip->flags & BTRFS_INODE_SYNC)
108 inode->i_flags |= S_SYNC;
109 if (ip->flags & BTRFS_INODE_IMMUTABLE)
110 inode->i_flags |= S_IMMUTABLE;
111 if (ip->flags & BTRFS_INODE_APPEND)
112 inode->i_flags |= S_APPEND;
113 if (ip->flags & BTRFS_INODE_NOATIME)
114 inode->i_flags |= S_NOATIME;
115 if (ip->flags & BTRFS_INODE_DIRSYNC)
116 inode->i_flags |= S_DIRSYNC;
120 * Inherit flags from the parent inode.
122 * Currently only the compression flags and the cow flags are inherited.
124 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
131 flags = BTRFS_I(dir)->flags;
133 if (flags & BTRFS_INODE_NOCOMPRESS) {
134 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
135 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
136 } else if (flags & BTRFS_INODE_COMPRESS) {
137 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
138 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
141 if (flags & BTRFS_INODE_NODATACOW)
142 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
144 btrfs_update_iflags(inode);
147 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
149 struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
150 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
152 if (copy_to_user(arg, &flags, sizeof(flags)))
157 static int check_flags(unsigned int flags)
159 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
160 FS_NOATIME_FL | FS_NODUMP_FL | \
161 FS_SYNC_FL | FS_DIRSYNC_FL | \
162 FS_NOCOMP_FL | FS_COMPR_FL |
166 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
172 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
174 struct inode *inode = file->f_path.dentry->d_inode;
175 struct btrfs_inode *ip = BTRFS_I(inode);
176 struct btrfs_root *root = ip->root;
177 struct btrfs_trans_handle *trans;
178 unsigned int flags, oldflags;
181 unsigned int i_oldflags;
183 if (btrfs_root_readonly(root))
186 if (copy_from_user(&flags, arg, sizeof(flags)))
189 ret = check_flags(flags);
193 if (!inode_owner_or_capable(inode))
196 mutex_lock(&inode->i_mutex);
198 ip_oldflags = ip->flags;
199 i_oldflags = inode->i_flags;
201 flags = btrfs_mask_flags(inode->i_mode, flags);
202 oldflags = btrfs_flags_to_ioctl(ip->flags);
203 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
204 if (!capable(CAP_LINUX_IMMUTABLE)) {
210 ret = mnt_want_write_file(file);
214 if (flags & FS_SYNC_FL)
215 ip->flags |= BTRFS_INODE_SYNC;
217 ip->flags &= ~BTRFS_INODE_SYNC;
218 if (flags & FS_IMMUTABLE_FL)
219 ip->flags |= BTRFS_INODE_IMMUTABLE;
221 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
222 if (flags & FS_APPEND_FL)
223 ip->flags |= BTRFS_INODE_APPEND;
225 ip->flags &= ~BTRFS_INODE_APPEND;
226 if (flags & FS_NODUMP_FL)
227 ip->flags |= BTRFS_INODE_NODUMP;
229 ip->flags &= ~BTRFS_INODE_NODUMP;
230 if (flags & FS_NOATIME_FL)
231 ip->flags |= BTRFS_INODE_NOATIME;
233 ip->flags &= ~BTRFS_INODE_NOATIME;
234 if (flags & FS_DIRSYNC_FL)
235 ip->flags |= BTRFS_INODE_DIRSYNC;
237 ip->flags &= ~BTRFS_INODE_DIRSYNC;
238 if (flags & FS_NOCOW_FL)
239 ip->flags |= BTRFS_INODE_NODATACOW;
241 ip->flags &= ~BTRFS_INODE_NODATACOW;
244 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
245 * flag may be changed automatically if compression code won't make
248 if (flags & FS_NOCOMP_FL) {
249 ip->flags &= ~BTRFS_INODE_COMPRESS;
250 ip->flags |= BTRFS_INODE_NOCOMPRESS;
251 } else if (flags & FS_COMPR_FL) {
252 ip->flags |= BTRFS_INODE_COMPRESS;
253 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
255 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
258 trans = btrfs_start_transaction(root, 1);
260 ret = PTR_ERR(trans);
264 btrfs_update_iflags(inode);
265 inode_inc_iversion(inode);
266 inode->i_ctime = CURRENT_TIME;
267 ret = btrfs_update_inode(trans, root, inode);
269 btrfs_end_transaction(trans, root);
272 ip->flags = ip_oldflags;
273 inode->i_flags = i_oldflags;
276 mnt_drop_write_file(file);
278 mutex_unlock(&inode->i_mutex);
282 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
284 struct inode *inode = file->f_path.dentry->d_inode;
286 return put_user(inode->i_generation, arg);
289 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
291 struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
292 struct btrfs_device *device;
293 struct request_queue *q;
294 struct fstrim_range range;
295 u64 minlen = ULLONG_MAX;
297 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
300 if (!capable(CAP_SYS_ADMIN))
304 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
308 q = bdev_get_queue(device->bdev);
309 if (blk_queue_discard(q)) {
311 minlen = min((u64)q->limits.discard_granularity,
319 if (copy_from_user(&range, arg, sizeof(range)))
321 if (range.start > total_bytes)
324 range.len = min(range.len, total_bytes - range.start);
325 range.minlen = max(range.minlen, minlen);
326 ret = btrfs_trim_fs(fs_info->tree_root, &range);
330 if (copy_to_user(arg, &range, sizeof(range)))
336 static noinline int create_subvol(struct btrfs_root *root,
337 struct dentry *dentry,
338 char *name, int namelen,
340 struct btrfs_qgroup_inherit **inherit)
342 struct btrfs_trans_handle *trans;
343 struct btrfs_key key;
344 struct btrfs_root_item root_item;
345 struct btrfs_inode_item *inode_item;
346 struct extent_buffer *leaf;
347 struct btrfs_root *new_root;
348 struct dentry *parent = dentry->d_parent;
353 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
356 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
360 dir = parent->d_inode;
368 trans = btrfs_start_transaction(root, 6);
370 return PTR_ERR(trans);
372 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,
373 inherit ? *inherit : NULL);
377 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
378 0, objectid, NULL, 0, 0, 0);
384 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
385 btrfs_set_header_bytenr(leaf, leaf->start);
386 btrfs_set_header_generation(leaf, trans->transid);
387 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
388 btrfs_set_header_owner(leaf, objectid);
390 write_extent_buffer(leaf, root->fs_info->fsid,
391 (unsigned long)btrfs_header_fsid(leaf),
393 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
394 (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
396 btrfs_mark_buffer_dirty(leaf);
398 inode_item = &root_item.inode;
399 memset(inode_item, 0, sizeof(*inode_item));
400 inode_item->generation = cpu_to_le64(1);
401 inode_item->size = cpu_to_le64(3);
402 inode_item->nlink = cpu_to_le32(1);
403 inode_item->nbytes = cpu_to_le64(root->leafsize);
404 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
407 root_item.byte_limit = 0;
408 inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
410 btrfs_set_root_bytenr(&root_item, leaf->start);
411 btrfs_set_root_generation(&root_item, trans->transid);
412 btrfs_set_root_level(&root_item, 0);
413 btrfs_set_root_refs(&root_item, 1);
414 btrfs_set_root_used(&root_item, leaf->len);
415 btrfs_set_root_last_snapshot(&root_item, 0);
417 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
418 root_item.drop_level = 0;
420 btrfs_tree_unlock(leaf);
421 free_extent_buffer(leaf);
424 btrfs_set_root_dirid(&root_item, new_dirid);
426 key.objectid = objectid;
428 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
429 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
434 key.offset = (u64)-1;
435 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
436 if (IS_ERR(new_root)) {
437 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
438 ret = PTR_ERR(new_root);
442 btrfs_record_root_in_trans(trans, new_root);
444 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
446 /* We potentially lose an unused inode item here */
447 btrfs_abort_transaction(trans, root, ret);
452 * insert the directory item
454 ret = btrfs_set_inode_index(dir, &index);
456 btrfs_abort_transaction(trans, root, ret);
460 ret = btrfs_insert_dir_item(trans, root,
461 name, namelen, dir, &key,
462 BTRFS_FT_DIR, index);
464 btrfs_abort_transaction(trans, root, ret);
468 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
469 ret = btrfs_update_inode(trans, root, dir);
472 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
473 objectid, root->root_key.objectid,
474 btrfs_ino(dir), index, name, namelen);
478 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
481 *async_transid = trans->transid;
482 err = btrfs_commit_transaction_async(trans, root, 1);
484 err = btrfs_commit_transaction(trans, root);
491 static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
492 char *name, int namelen, u64 *async_transid,
493 bool readonly, struct btrfs_qgroup_inherit **inherit)
496 struct btrfs_pending_snapshot *pending_snapshot;
497 struct btrfs_trans_handle *trans;
503 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
504 if (!pending_snapshot)
507 btrfs_init_block_rsv(&pending_snapshot->block_rsv);
508 pending_snapshot->dentry = dentry;
509 pending_snapshot->root = root;
510 pending_snapshot->readonly = readonly;
512 pending_snapshot->inherit = *inherit;
513 *inherit = NULL; /* take responsibility to free it */
516 trans = btrfs_start_transaction(root->fs_info->extent_root, 5);
518 ret = PTR_ERR(trans);
522 ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
525 spin_lock(&root->fs_info->trans_lock);
526 list_add(&pending_snapshot->list,
527 &trans->transaction->pending_snapshots);
528 spin_unlock(&root->fs_info->trans_lock);
530 *async_transid = trans->transid;
531 ret = btrfs_commit_transaction_async(trans,
532 root->fs_info->extent_root, 1);
534 ret = btrfs_commit_transaction(trans,
535 root->fs_info->extent_root);
539 ret = pending_snapshot->error;
543 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
547 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
549 ret = PTR_ERR(inode);
553 d_instantiate(dentry, inode);
556 kfree(pending_snapshot);
560 /* copy of check_sticky in fs/namei.c()
561 * It's inline, so penalty for filesystems that don't use sticky bit is
564 static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
566 uid_t fsuid = current_fsuid();
568 if (!(dir->i_mode & S_ISVTX))
570 if (inode->i_uid == fsuid)
572 if (dir->i_uid == fsuid)
574 return !capable(CAP_FOWNER);
577 /* copy of may_delete in fs/namei.c()
578 * Check whether we can remove a link victim from directory dir, check
579 * whether the type of victim is right.
580 * 1. We can't do it if dir is read-only (done in permission())
581 * 2. We should have write and exec permissions on dir
582 * 3. We can't remove anything from append-only dir
583 * 4. We can't do anything with immutable dir (done in permission())
584 * 5. If the sticky bit on dir is set we should either
585 * a. be owner of dir, or
586 * b. be owner of victim, or
587 * c. have CAP_FOWNER capability
588 * 6. If the victim is append-only or immutable we can't do antyhing with
589 * links pointing to it.
590 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
591 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
592 * 9. We can't remove a root or mountpoint.
593 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
594 * nfs_async_unlink().
597 static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
601 if (!victim->d_inode)
604 BUG_ON(victim->d_parent->d_inode != dir);
605 audit_inode_child(victim, dir);
607 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
612 if (btrfs_check_sticky(dir, victim->d_inode)||
613 IS_APPEND(victim->d_inode)||
614 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
617 if (!S_ISDIR(victim->d_inode->i_mode))
621 } else if (S_ISDIR(victim->d_inode->i_mode))
625 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
630 /* copy of may_create in fs/namei.c() */
631 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
637 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
641 * Create a new subvolume below @parent. This is largely modeled after
642 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
643 * inside this filesystem so it's quite a bit simpler.
645 static noinline int btrfs_mksubvol(struct path *parent,
646 char *name, int namelen,
647 struct btrfs_root *snap_src,
648 u64 *async_transid, bool readonly,
649 struct btrfs_qgroup_inherit **inherit)
651 struct inode *dir = parent->dentry->d_inode;
652 struct dentry *dentry;
655 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
657 dentry = lookup_one_len(name, parent->dentry, namelen);
658 error = PTR_ERR(dentry);
666 error = btrfs_may_create(dir, dentry);
670 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
672 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
676 error = create_snapshot(snap_src, dentry, name, namelen,
677 async_transid, readonly, inherit);
679 error = create_subvol(BTRFS_I(dir)->root, dentry,
680 name, namelen, async_transid, inherit);
683 fsnotify_mkdir(dir, dentry);
685 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
689 mutex_unlock(&dir->i_mutex);
694 * When we're defragging a range, we don't want to kick it off again
695 * if it is really just waiting for delalloc to send it down.
696 * If we find a nice big extent or delalloc range for the bytes in the
697 * file you want to defrag, we return 0 to let you know to skip this
700 static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
702 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
703 struct extent_map *em = NULL;
704 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
707 read_lock(&em_tree->lock);
708 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
709 read_unlock(&em_tree->lock);
712 end = extent_map_end(em);
714 if (end - offset > thresh)
717 /* if we already have a nice delalloc here, just stop */
719 end = count_range_bits(io_tree, &offset, offset + thresh,
720 thresh, EXTENT_DELALLOC, 1);
727 * helper function to walk through a file and find extents
728 * newer than a specific transid, and smaller than thresh.
730 * This is used by the defragging code to find new and small
733 static int find_new_extents(struct btrfs_root *root,
734 struct inode *inode, u64 newer_than,
735 u64 *off, int thresh)
737 struct btrfs_path *path;
738 struct btrfs_key min_key;
739 struct btrfs_key max_key;
740 struct extent_buffer *leaf;
741 struct btrfs_file_extent_item *extent;
744 u64 ino = btrfs_ino(inode);
746 path = btrfs_alloc_path();
750 min_key.objectid = ino;
751 min_key.type = BTRFS_EXTENT_DATA_KEY;
752 min_key.offset = *off;
754 max_key.objectid = ino;
755 max_key.type = (u8)-1;
756 max_key.offset = (u64)-1;
758 path->keep_locks = 1;
761 ret = btrfs_search_forward(root, &min_key, &max_key,
762 path, 0, newer_than);
765 if (min_key.objectid != ino)
767 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
770 leaf = path->nodes[0];
771 extent = btrfs_item_ptr(leaf, path->slots[0],
772 struct btrfs_file_extent_item);
774 type = btrfs_file_extent_type(leaf, extent);
775 if (type == BTRFS_FILE_EXTENT_REG &&
776 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
777 check_defrag_in_cache(inode, min_key.offset, thresh)) {
778 *off = min_key.offset;
779 btrfs_free_path(path);
783 if (min_key.offset == (u64)-1)
787 btrfs_release_path(path);
790 btrfs_free_path(path);
794 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
796 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
797 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
798 struct extent_map *em;
799 u64 len = PAGE_CACHE_SIZE;
802 * hopefully we have this extent in the tree already, try without
803 * the full extent lock
805 read_lock(&em_tree->lock);
806 em = lookup_extent_mapping(em_tree, start, len);
807 read_unlock(&em_tree->lock);
810 /* get the big lock and read metadata off disk */
811 lock_extent(io_tree, start, start + len - 1);
812 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
813 unlock_extent(io_tree, start, start + len - 1);
822 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
824 struct extent_map *next;
827 /* this is the last extent */
828 if (em->start + em->len >= i_size_read(inode))
831 next = defrag_lookup_extent(inode, em->start + em->len);
832 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
835 free_extent_map(next);
839 static int should_defrag_range(struct inode *inode, u64 start, int thresh,
840 u64 *last_len, u64 *skip, u64 *defrag_end,
843 struct extent_map *em;
845 bool next_mergeable = true;
848 * make sure that once we start defragging an extent, we keep on
851 if (start < *defrag_end)
856 em = defrag_lookup_extent(inode, start);
860 /* this will cover holes, and inline extents */
861 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
866 next_mergeable = defrag_check_next_extent(inode, em);
869 * we hit a real extent, if it is big or the next extent is not a
870 * real extent, don't bother defragging it
872 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
873 (em->len >= thresh || !next_mergeable))
877 * last_len ends up being a counter of how many bytes we've defragged.
878 * every time we choose not to defrag an extent, we reset *last_len
879 * so that the next tiny extent will force a defrag.
881 * The end result of this is that tiny extents before a single big
882 * extent will force at least part of that big extent to be defragged.
885 *defrag_end = extent_map_end(em);
888 *skip = extent_map_end(em);
897 * it doesn't do much good to defrag one or two pages
898 * at a time. This pulls in a nice chunk of pages
901 * It also makes sure the delalloc code has enough
902 * dirty data to avoid making new small extents as part
905 * It's a good idea to start RA on this range
906 * before calling this.
908 static int cluster_pages_for_defrag(struct inode *inode,
910 unsigned long start_index,
913 unsigned long file_end;
914 u64 isize = i_size_read(inode);
921 struct btrfs_ordered_extent *ordered;
922 struct extent_state *cached_state = NULL;
923 struct extent_io_tree *tree;
924 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
926 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
927 if (!isize || start_index > file_end)
930 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
932 ret = btrfs_delalloc_reserve_space(inode,
933 page_cnt << PAGE_CACHE_SHIFT);
937 tree = &BTRFS_I(inode)->io_tree;
939 /* step one, lock all the pages */
940 for (i = 0; i < page_cnt; i++) {
943 page = find_or_create_page(inode->i_mapping,
944 start_index + i, mask);
948 page_start = page_offset(page);
949 page_end = page_start + PAGE_CACHE_SIZE - 1;
951 lock_extent(tree, page_start, page_end);
952 ordered = btrfs_lookup_ordered_extent(inode,
954 unlock_extent(tree, page_start, page_end);
959 btrfs_start_ordered_extent(inode, ordered, 1);
960 btrfs_put_ordered_extent(ordered);
963 * we unlocked the page above, so we need check if
964 * it was released or not.
966 if (page->mapping != inode->i_mapping) {
968 page_cache_release(page);
973 if (!PageUptodate(page)) {
974 btrfs_readpage(NULL, page);
976 if (!PageUptodate(page)) {
978 page_cache_release(page);
984 if (page->mapping != inode->i_mapping) {
986 page_cache_release(page);
996 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1000 * so now we have a nice long stream of locked
1001 * and up to date pages, lets wait on them
1003 for (i = 0; i < i_done; i++)
1004 wait_on_page_writeback(pages[i]);
1006 page_start = page_offset(pages[0]);
1007 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1009 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1010 page_start, page_end - 1, 0, &cached_state);
1011 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1012 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1013 EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
1016 if (i_done != page_cnt) {
1017 spin_lock(&BTRFS_I(inode)->lock);
1018 BTRFS_I(inode)->outstanding_extents++;
1019 spin_unlock(&BTRFS_I(inode)->lock);
1020 btrfs_delalloc_release_space(inode,
1021 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1025 btrfs_set_extent_delalloc(inode, page_start, page_end - 1,
1028 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1029 page_start, page_end - 1, &cached_state,
1032 for (i = 0; i < i_done; i++) {
1033 clear_page_dirty_for_io(pages[i]);
1034 ClearPageChecked(pages[i]);
1035 set_page_extent_mapped(pages[i]);
1036 set_page_dirty(pages[i]);
1037 unlock_page(pages[i]);
1038 page_cache_release(pages[i]);
1042 for (i = 0; i < i_done; i++) {
1043 unlock_page(pages[i]);
1044 page_cache_release(pages[i]);
1046 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
1051 int btrfs_defrag_file(struct inode *inode, struct file *file,
1052 struct btrfs_ioctl_defrag_range_args *range,
1053 u64 newer_than, unsigned long max_to_defrag)
1055 struct btrfs_root *root = BTRFS_I(inode)->root;
1056 struct btrfs_super_block *disk_super;
1057 struct file_ra_state *ra = NULL;
1058 unsigned long last_index;
1059 u64 isize = i_size_read(inode);
1064 u64 newer_off = range->start;
1066 unsigned long ra_index = 0;
1068 int defrag_count = 0;
1069 int compress_type = BTRFS_COMPRESS_ZLIB;
1070 int extent_thresh = range->extent_thresh;
1071 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1072 int cluster = max_cluster;
1073 u64 new_align = ~((u64)128 * 1024 - 1);
1074 struct page **pages = NULL;
1076 if (extent_thresh == 0)
1077 extent_thresh = 256 * 1024;
1079 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1080 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1082 if (range->compress_type)
1083 compress_type = range->compress_type;
1090 * if we were not given a file, allocate a readahead
1094 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1097 file_ra_state_init(ra, inode->i_mapping);
1102 pages = kmalloc(sizeof(struct page *) * max_cluster,
1109 /* find the last page to defrag */
1110 if (range->start + range->len > range->start) {
1111 last_index = min_t(u64, isize - 1,
1112 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1114 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1118 ret = find_new_extents(root, inode, newer_than,
1119 &newer_off, 64 * 1024);
1121 range->start = newer_off;
1123 * we always align our defrag to help keep
1124 * the extents in the file evenly spaced
1126 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1130 i = range->start >> PAGE_CACHE_SHIFT;
1133 max_to_defrag = last_index + 1;
1136 * make writeback starts from i, so the defrag range can be
1137 * written sequentially.
1139 if (i < inode->i_mapping->writeback_index)
1140 inode->i_mapping->writeback_index = i;
1142 while (i <= last_index && defrag_count < max_to_defrag &&
1143 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1144 PAGE_CACHE_SHIFT)) {
1146 * make sure we stop running if someone unmounts
1149 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1152 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1153 extent_thresh, &last_len, &skip,
1154 &defrag_end, range->flags &
1155 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1158 * the should_defrag function tells us how much to skip
1159 * bump our counter by the suggested amount
1161 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1162 i = max(i + 1, next);
1167 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1168 PAGE_CACHE_SHIFT) - i;
1169 cluster = min(cluster, max_cluster);
1171 cluster = max_cluster;
1174 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1175 BTRFS_I(inode)->force_compress = compress_type;
1177 if (i + cluster > ra_index) {
1178 ra_index = max(i, ra_index);
1179 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1181 ra_index += max_cluster;
1184 mutex_lock(&inode->i_mutex);
1185 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1187 mutex_unlock(&inode->i_mutex);
1191 defrag_count += ret;
1192 balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
1193 mutex_unlock(&inode->i_mutex);
1196 if (newer_off == (u64)-1)
1202 newer_off = max(newer_off + 1,
1203 (u64)i << PAGE_CACHE_SHIFT);
1205 ret = find_new_extents(root, inode,
1206 newer_than, &newer_off,
1209 range->start = newer_off;
1210 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1217 last_len += ret << PAGE_CACHE_SHIFT;
1225 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1226 filemap_flush(inode->i_mapping);
1228 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1229 /* the filemap_flush will queue IO into the worker threads, but
1230 * we have to make sure the IO is actually started and that
1231 * ordered extents get created before we return
1233 atomic_inc(&root->fs_info->async_submit_draining);
1234 while (atomic_read(&root->fs_info->nr_async_submits) ||
1235 atomic_read(&root->fs_info->async_delalloc_pages)) {
1236 wait_event(root->fs_info->async_submit_wait,
1237 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1238 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1240 atomic_dec(&root->fs_info->async_submit_draining);
1242 mutex_lock(&inode->i_mutex);
1243 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1244 mutex_unlock(&inode->i_mutex);
1247 disk_super = root->fs_info->super_copy;
1248 features = btrfs_super_incompat_flags(disk_super);
1249 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1250 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
1251 btrfs_set_super_incompat_flags(disk_super, features);
1263 static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
1269 struct btrfs_ioctl_vol_args *vol_args;
1270 struct btrfs_trans_handle *trans;
1271 struct btrfs_device *device = NULL;
1273 char *devstr = NULL;
1277 if (root->fs_info->sb->s_flags & MS_RDONLY)
1280 if (!capable(CAP_SYS_ADMIN))
1283 mutex_lock(&root->fs_info->volume_mutex);
1284 if (root->fs_info->balance_ctl) {
1285 printk(KERN_INFO "btrfs: balance in progress\n");
1290 vol_args = memdup_user(arg, sizeof(*vol_args));
1291 if (IS_ERR(vol_args)) {
1292 ret = PTR_ERR(vol_args);
1296 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1298 sizestr = vol_args->name;
1299 devstr = strchr(sizestr, ':');
1302 sizestr = devstr + 1;
1304 devstr = vol_args->name;
1305 devid = simple_strtoull(devstr, &end, 10);
1306 printk(KERN_INFO "btrfs: resizing devid %llu\n",
1307 (unsigned long long)devid);
1309 device = btrfs_find_device(root, devid, NULL, NULL);
1311 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
1312 (unsigned long long)devid);
1316 if (device->fs_devices && device->fs_devices->seeding) {
1317 printk(KERN_INFO "btrfs: resizer unable to apply on "
1318 "seeding device %llu\n",
1319 (unsigned long long)devid);
1324 if (!strcmp(sizestr, "max"))
1325 new_size = device->bdev->bd_inode->i_size;
1327 if (sizestr[0] == '-') {
1330 } else if (sizestr[0] == '+') {
1334 new_size = memparse(sizestr, NULL);
1335 if (new_size == 0) {
1341 old_size = device->total_bytes;
1344 if (new_size > old_size) {
1348 new_size = old_size - new_size;
1349 } else if (mod > 0) {
1350 new_size = old_size + new_size;
1353 if (new_size < 256 * 1024 * 1024) {
1357 if (new_size > device->bdev->bd_inode->i_size) {
1362 do_div(new_size, root->sectorsize);
1363 new_size *= root->sectorsize;
1365 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1366 rcu_str_deref(device->name),
1367 (unsigned long long)new_size);
1369 if (new_size > old_size) {
1370 trans = btrfs_start_transaction(root, 0);
1371 if (IS_ERR(trans)) {
1372 ret = PTR_ERR(trans);
1375 ret = btrfs_grow_device(trans, device, new_size);
1376 btrfs_commit_transaction(trans, root);
1377 } else if (new_size < old_size) {
1378 ret = btrfs_shrink_device(device, new_size);
1384 mutex_unlock(&root->fs_info->volume_mutex);
1388 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1389 char *name, unsigned long fd, int subvol,
1390 u64 *transid, bool readonly,
1391 struct btrfs_qgroup_inherit **inherit)
1393 struct file *src_file;
1397 ret = mnt_want_write_file(file);
1401 namelen = strlen(name);
1402 if (strchr(name, '/')) {
1404 goto out_drop_write;
1407 if (name[0] == '.' &&
1408 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1410 goto out_drop_write;
1414 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1415 NULL, transid, readonly, inherit);
1417 struct inode *src_inode;
1418 src_file = fget(fd);
1421 goto out_drop_write;
1424 src_inode = src_file->f_path.dentry->d_inode;
1425 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
1426 printk(KERN_INFO "btrfs: Snapshot src from "
1430 goto out_drop_write;
1432 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1433 BTRFS_I(src_inode)->root,
1434 transid, readonly, inherit);
1438 mnt_drop_write_file(file);
1443 static noinline int btrfs_ioctl_snap_create(struct file *file,
1444 void __user *arg, int subvol)
1446 struct btrfs_ioctl_vol_args *vol_args;
1449 vol_args = memdup_user(arg, sizeof(*vol_args));
1450 if (IS_ERR(vol_args))
1451 return PTR_ERR(vol_args);
1452 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1454 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1455 vol_args->fd, subvol,
1462 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1463 void __user *arg, int subvol)
1465 struct btrfs_ioctl_vol_args_v2 *vol_args;
1469 bool readonly = false;
1470 struct btrfs_qgroup_inherit *inherit = NULL;
1472 vol_args = memdup_user(arg, sizeof(*vol_args));
1473 if (IS_ERR(vol_args))
1474 return PTR_ERR(vol_args);
1475 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1477 if (vol_args->flags &
1478 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1479 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1484 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1486 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1488 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1489 if (vol_args->size > PAGE_CACHE_SIZE) {
1493 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1494 if (IS_ERR(inherit)) {
1495 ret = PTR_ERR(inherit);
1500 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1501 vol_args->fd, subvol, ptr,
1502 readonly, &inherit);
1504 if (ret == 0 && ptr &&
1506 offsetof(struct btrfs_ioctl_vol_args_v2,
1507 transid), ptr, sizeof(*ptr)))
1515 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1518 struct inode *inode = fdentry(file)->d_inode;
1519 struct btrfs_root *root = BTRFS_I(inode)->root;
1523 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1526 down_read(&root->fs_info->subvol_sem);
1527 if (btrfs_root_readonly(root))
1528 flags |= BTRFS_SUBVOL_RDONLY;
1529 up_read(&root->fs_info->subvol_sem);
1531 if (copy_to_user(arg, &flags, sizeof(flags)))
1537 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1540 struct inode *inode = fdentry(file)->d_inode;
1541 struct btrfs_root *root = BTRFS_I(inode)->root;
1542 struct btrfs_trans_handle *trans;
1547 ret = mnt_want_write_file(file);
1551 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1553 goto out_drop_write;
1556 if (copy_from_user(&flags, arg, sizeof(flags))) {
1558 goto out_drop_write;
1561 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1563 goto out_drop_write;
1566 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1568 goto out_drop_write;
1571 if (!inode_owner_or_capable(inode)) {
1573 goto out_drop_write;
1576 down_write(&root->fs_info->subvol_sem);
1579 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1582 root_flags = btrfs_root_flags(&root->root_item);
1583 if (flags & BTRFS_SUBVOL_RDONLY)
1584 btrfs_set_root_flags(&root->root_item,
1585 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1587 btrfs_set_root_flags(&root->root_item,
1588 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1590 trans = btrfs_start_transaction(root, 1);
1591 if (IS_ERR(trans)) {
1592 ret = PTR_ERR(trans);
1596 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1597 &root->root_key, &root->root_item);
1599 btrfs_commit_transaction(trans, root);
1602 btrfs_set_root_flags(&root->root_item, root_flags);
1604 up_write(&root->fs_info->subvol_sem);
1606 mnt_drop_write_file(file);
1612 * helper to check if the subvolume references other subvolumes
1614 static noinline int may_destroy_subvol(struct btrfs_root *root)
1616 struct btrfs_path *path;
1617 struct btrfs_key key;
1620 path = btrfs_alloc_path();
1624 key.objectid = root->root_key.objectid;
1625 key.type = BTRFS_ROOT_REF_KEY;
1626 key.offset = (u64)-1;
1628 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1635 if (path->slots[0] > 0) {
1637 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1638 if (key.objectid == root->root_key.objectid &&
1639 key.type == BTRFS_ROOT_REF_KEY)
1643 btrfs_free_path(path);
1647 static noinline int key_in_sk(struct btrfs_key *key,
1648 struct btrfs_ioctl_search_key *sk)
1650 struct btrfs_key test;
1653 test.objectid = sk->min_objectid;
1654 test.type = sk->min_type;
1655 test.offset = sk->min_offset;
1657 ret = btrfs_comp_cpu_keys(key, &test);
1661 test.objectid = sk->max_objectid;
1662 test.type = sk->max_type;
1663 test.offset = sk->max_offset;
1665 ret = btrfs_comp_cpu_keys(key, &test);
1671 static noinline int copy_to_sk(struct btrfs_root *root,
1672 struct btrfs_path *path,
1673 struct btrfs_key *key,
1674 struct btrfs_ioctl_search_key *sk,
1676 unsigned long *sk_offset,
1680 struct extent_buffer *leaf;
1681 struct btrfs_ioctl_search_header sh;
1682 unsigned long item_off;
1683 unsigned long item_len;
1689 leaf = path->nodes[0];
1690 slot = path->slots[0];
1691 nritems = btrfs_header_nritems(leaf);
1693 if (btrfs_header_generation(leaf) > sk->max_transid) {
1697 found_transid = btrfs_header_generation(leaf);
1699 for (i = slot; i < nritems; i++) {
1700 item_off = btrfs_item_ptr_offset(leaf, i);
1701 item_len = btrfs_item_size_nr(leaf, i);
1703 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1706 if (sizeof(sh) + item_len + *sk_offset >
1707 BTRFS_SEARCH_ARGS_BUFSIZE) {
1712 btrfs_item_key_to_cpu(leaf, key, i);
1713 if (!key_in_sk(key, sk))
1716 sh.objectid = key->objectid;
1717 sh.offset = key->offset;
1718 sh.type = key->type;
1720 sh.transid = found_transid;
1722 /* copy search result header */
1723 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1724 *sk_offset += sizeof(sh);
1727 char *p = buf + *sk_offset;
1729 read_extent_buffer(leaf, p,
1730 item_off, item_len);
1731 *sk_offset += item_len;
1735 if (*num_found >= sk->nr_items)
1740 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1742 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1745 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1755 static noinline int search_ioctl(struct inode *inode,
1756 struct btrfs_ioctl_search_args *args)
1758 struct btrfs_root *root;
1759 struct btrfs_key key;
1760 struct btrfs_key max_key;
1761 struct btrfs_path *path;
1762 struct btrfs_ioctl_search_key *sk = &args->key;
1763 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1766 unsigned long sk_offset = 0;
1768 path = btrfs_alloc_path();
1772 if (sk->tree_id == 0) {
1773 /* search the root of the inode that was passed */
1774 root = BTRFS_I(inode)->root;
1776 key.objectid = sk->tree_id;
1777 key.type = BTRFS_ROOT_ITEM_KEY;
1778 key.offset = (u64)-1;
1779 root = btrfs_read_fs_root_no_name(info, &key);
1781 printk(KERN_ERR "could not find root %llu\n",
1783 btrfs_free_path(path);
1788 key.objectid = sk->min_objectid;
1789 key.type = sk->min_type;
1790 key.offset = sk->min_offset;
1792 max_key.objectid = sk->max_objectid;
1793 max_key.type = sk->max_type;
1794 max_key.offset = sk->max_offset;
1796 path->keep_locks = 1;
1799 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1806 ret = copy_to_sk(root, path, &key, sk, args->buf,
1807 &sk_offset, &num_found);
1808 btrfs_release_path(path);
1809 if (ret || num_found >= sk->nr_items)
1815 sk->nr_items = num_found;
1816 btrfs_free_path(path);
1820 static noinline int btrfs_ioctl_tree_search(struct file *file,
1823 struct btrfs_ioctl_search_args *args;
1824 struct inode *inode;
1827 if (!capable(CAP_SYS_ADMIN))
1830 args = memdup_user(argp, sizeof(*args));
1832 return PTR_ERR(args);
1834 inode = fdentry(file)->d_inode;
1835 ret = search_ioctl(inode, args);
1836 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1843 * Search INODE_REFs to identify path name of 'dirid' directory
1844 * in a 'tree_id' tree. and sets path name to 'name'.
1846 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1847 u64 tree_id, u64 dirid, char *name)
1849 struct btrfs_root *root;
1850 struct btrfs_key key;
1856 struct btrfs_inode_ref *iref;
1857 struct extent_buffer *l;
1858 struct btrfs_path *path;
1860 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1865 path = btrfs_alloc_path();
1869 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1871 key.objectid = tree_id;
1872 key.type = BTRFS_ROOT_ITEM_KEY;
1873 key.offset = (u64)-1;
1874 root = btrfs_read_fs_root_no_name(info, &key);
1876 printk(KERN_ERR "could not find root %llu\n", tree_id);
1881 key.objectid = dirid;
1882 key.type = BTRFS_INODE_REF_KEY;
1883 key.offset = (u64)-1;
1886 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1891 slot = path->slots[0];
1892 if (ret > 0 && slot > 0)
1894 btrfs_item_key_to_cpu(l, &key, slot);
1896 if (ret > 0 && (key.objectid != dirid ||
1897 key.type != BTRFS_INODE_REF_KEY)) {
1902 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1903 len = btrfs_inode_ref_name_len(l, iref);
1905 total_len += len + 1;
1910 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1912 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1915 btrfs_release_path(path);
1916 key.objectid = key.offset;
1917 key.offset = (u64)-1;
1918 dirid = key.objectid;
1922 memmove(name, ptr, total_len);
1923 name[total_len]='\0';
1926 btrfs_free_path(path);
1930 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1933 struct btrfs_ioctl_ino_lookup_args *args;
1934 struct inode *inode;
1937 if (!capable(CAP_SYS_ADMIN))
1940 args = memdup_user(argp, sizeof(*args));
1942 return PTR_ERR(args);
1944 inode = fdentry(file)->d_inode;
1946 if (args->treeid == 0)
1947 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
1949 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
1950 args->treeid, args->objectid,
1953 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1960 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
1963 struct dentry *parent = fdentry(file);
1964 struct dentry *dentry;
1965 struct inode *dir = parent->d_inode;
1966 struct inode *inode;
1967 struct btrfs_root *root = BTRFS_I(dir)->root;
1968 struct btrfs_root *dest = NULL;
1969 struct btrfs_ioctl_vol_args *vol_args;
1970 struct btrfs_trans_handle *trans;
1975 vol_args = memdup_user(arg, sizeof(*vol_args));
1976 if (IS_ERR(vol_args))
1977 return PTR_ERR(vol_args);
1979 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1980 namelen = strlen(vol_args->name);
1981 if (strchr(vol_args->name, '/') ||
1982 strncmp(vol_args->name, "..", namelen) == 0) {
1987 err = mnt_want_write_file(file);
1991 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
1992 dentry = lookup_one_len(vol_args->name, parent, namelen);
1993 if (IS_ERR(dentry)) {
1994 err = PTR_ERR(dentry);
1995 goto out_unlock_dir;
1998 if (!dentry->d_inode) {
2003 inode = dentry->d_inode;
2004 dest = BTRFS_I(inode)->root;
2005 if (!capable(CAP_SYS_ADMIN)){
2007 * Regular user. Only allow this with a special mount
2008 * option, when the user has write+exec access to the
2009 * subvol root, and when rmdir(2) would have been
2012 * Note that this is _not_ check that the subvol is
2013 * empty or doesn't contain data that we wouldn't
2014 * otherwise be able to delete.
2016 * Users who want to delete empty subvols should try
2020 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2024 * Do not allow deletion if the parent dir is the same
2025 * as the dir to be deleted. That means the ioctl
2026 * must be called on the dentry referencing the root
2027 * of the subvol, not a random directory contained
2034 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2038 /* check if subvolume may be deleted by a non-root user */
2039 err = btrfs_may_delete(dir, dentry, 1);
2044 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2049 mutex_lock(&inode->i_mutex);
2050 err = d_invalidate(dentry);
2054 down_write(&root->fs_info->subvol_sem);
2056 err = may_destroy_subvol(dest);
2060 trans = btrfs_start_transaction(root, 0);
2061 if (IS_ERR(trans)) {
2062 err = PTR_ERR(trans);
2065 trans->block_rsv = &root->fs_info->global_block_rsv;
2067 ret = btrfs_unlink_subvol(trans, root, dir,
2068 dest->root_key.objectid,
2069 dentry->d_name.name,
2070 dentry->d_name.len);
2073 btrfs_abort_transaction(trans, root, ret);
2077 btrfs_record_root_in_trans(trans, dest);
2079 memset(&dest->root_item.drop_progress, 0,
2080 sizeof(dest->root_item.drop_progress));
2081 dest->root_item.drop_level = 0;
2082 btrfs_set_root_refs(&dest->root_item, 0);
2084 if (!xchg(&dest->orphan_item_inserted, 1)) {
2085 ret = btrfs_insert_orphan_item(trans,
2086 root->fs_info->tree_root,
2087 dest->root_key.objectid);
2089 btrfs_abort_transaction(trans, root, ret);
2095 ret = btrfs_end_transaction(trans, root);
2098 inode->i_flags |= S_DEAD;
2100 up_write(&root->fs_info->subvol_sem);
2102 mutex_unlock(&inode->i_mutex);
2104 shrink_dcache_sb(root->fs_info->sb);
2105 btrfs_invalidate_inodes(dest);
2111 mutex_unlock(&dir->i_mutex);
2112 mnt_drop_write_file(file);
2118 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2120 struct inode *inode = fdentry(file)->d_inode;
2121 struct btrfs_root *root = BTRFS_I(inode)->root;
2122 struct btrfs_ioctl_defrag_range_args *range;
2125 if (btrfs_root_readonly(root))
2128 ret = mnt_want_write_file(file);
2132 switch (inode->i_mode & S_IFMT) {
2134 if (!capable(CAP_SYS_ADMIN)) {
2138 ret = btrfs_defrag_root(root, 0);
2141 ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
2144 if (!(file->f_mode & FMODE_WRITE)) {
2149 range = kzalloc(sizeof(*range), GFP_KERNEL);
2156 if (copy_from_user(range, argp,
2162 /* compression requires us to start the IO */
2163 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2164 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2165 range->extent_thresh = (u32)-1;
2168 /* the rest are all set to zero by kzalloc */
2169 range->len = (u64)-1;
2171 ret = btrfs_defrag_file(fdentry(file)->d_inode, file,
2181 mnt_drop_write_file(file);
2185 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2187 struct btrfs_ioctl_vol_args *vol_args;
2190 if (!capable(CAP_SYS_ADMIN))
2193 mutex_lock(&root->fs_info->volume_mutex);
2194 if (root->fs_info->balance_ctl) {
2195 printk(KERN_INFO "btrfs: balance in progress\n");
2200 vol_args = memdup_user(arg, sizeof(*vol_args));
2201 if (IS_ERR(vol_args)) {
2202 ret = PTR_ERR(vol_args);
2206 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2207 ret = btrfs_init_new_device(root, vol_args->name);
2211 mutex_unlock(&root->fs_info->volume_mutex);
2215 static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
2217 struct btrfs_ioctl_vol_args *vol_args;
2220 if (!capable(CAP_SYS_ADMIN))
2223 if (root->fs_info->sb->s_flags & MS_RDONLY)
2226 mutex_lock(&root->fs_info->volume_mutex);
2227 if (root->fs_info->balance_ctl) {
2228 printk(KERN_INFO "btrfs: balance in progress\n");
2233 vol_args = memdup_user(arg, sizeof(*vol_args));
2234 if (IS_ERR(vol_args)) {
2235 ret = PTR_ERR(vol_args);
2239 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2240 ret = btrfs_rm_device(root, vol_args->name);
2244 mutex_unlock(&root->fs_info->volume_mutex);
2248 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2250 struct btrfs_ioctl_fs_info_args *fi_args;
2251 struct btrfs_device *device;
2252 struct btrfs_device *next;
2253 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2256 if (!capable(CAP_SYS_ADMIN))
2259 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2263 fi_args->num_devices = fs_devices->num_devices;
2264 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2266 mutex_lock(&fs_devices->device_list_mutex);
2267 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
2268 if (device->devid > fi_args->max_id)
2269 fi_args->max_id = device->devid;
2271 mutex_unlock(&fs_devices->device_list_mutex);
2273 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2280 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2282 struct btrfs_ioctl_dev_info_args *di_args;
2283 struct btrfs_device *dev;
2284 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2286 char *s_uuid = NULL;
2287 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2289 if (!capable(CAP_SYS_ADMIN))
2292 di_args = memdup_user(arg, sizeof(*di_args));
2293 if (IS_ERR(di_args))
2294 return PTR_ERR(di_args);
2296 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2297 s_uuid = di_args->uuid;
2299 mutex_lock(&fs_devices->device_list_mutex);
2300 dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL);
2301 mutex_unlock(&fs_devices->device_list_mutex);
2308 di_args->devid = dev->devid;
2309 di_args->bytes_used = dev->bytes_used;
2310 di_args->total_bytes = dev->total_bytes;
2311 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2313 struct rcu_string *name;
2316 name = rcu_dereference(dev->name);
2317 strncpy(di_args->path, name->str, sizeof(di_args->path));
2319 di_args->path[sizeof(di_args->path) - 1] = 0;
2321 di_args->path[0] = '\0';
2325 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2332 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2333 u64 off, u64 olen, u64 destoff)
2335 struct inode *inode = fdentry(file)->d_inode;
2336 struct btrfs_root *root = BTRFS_I(inode)->root;
2337 struct file *src_file;
2339 struct btrfs_trans_handle *trans;
2340 struct btrfs_path *path;
2341 struct extent_buffer *leaf;
2343 struct btrfs_key key;
2348 u64 bs = root->fs_info->sb->s_blocksize;
2353 * - split compressed inline extents. annoying: we need to
2354 * decompress into destination's address_space (the file offset
2355 * may change, so source mapping won't do), then recompress (or
2356 * otherwise reinsert) a subrange.
2357 * - allow ranges within the same file to be cloned (provided
2358 * they don't overlap)?
2361 /* the destination must be opened for writing */
2362 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
2365 if (btrfs_root_readonly(root))
2368 ret = mnt_want_write_file(file);
2372 src_file = fget(srcfd);
2375 goto out_drop_write;
2378 src = src_file->f_dentry->d_inode;
2384 /* the src must be open for reading */
2385 if (!(src_file->f_mode & FMODE_READ))
2388 /* don't make the dst file partly checksummed */
2389 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2390 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2394 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2398 if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
2402 buf = vmalloc(btrfs_level_size(root, 0));
2406 path = btrfs_alloc_path();
2414 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2415 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
2417 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2418 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2421 /* determine range to clone */
2423 if (off + len > src->i_size || off + len < off)
2426 olen = len = src->i_size - off;
2427 /* if we extend to eof, continue to block boundary */
2428 if (off + len == src->i_size)
2429 len = ALIGN(src->i_size, bs) - off;
2431 /* verify the end result is block aligned */
2432 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2433 !IS_ALIGNED(destoff, bs))
2436 if (destoff > inode->i_size) {
2437 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2442 /* truncate page cache pages from target inode range */
2443 truncate_inode_pages_range(&inode->i_data, destoff,
2444 PAGE_CACHE_ALIGN(destoff + len) - 1);
2446 /* do any pending delalloc/csum calc on src, one way or
2447 another, and lock file content */
2449 struct btrfs_ordered_extent *ordered;
2450 lock_extent(&BTRFS_I(src)->io_tree, off, off+len);
2451 ordered = btrfs_lookup_first_ordered_extent(src, off+len);
2453 !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len,
2454 EXTENT_DELALLOC, 0, NULL))
2456 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len);
2458 btrfs_put_ordered_extent(ordered);
2459 btrfs_wait_ordered_range(src, off, len);
2463 key.objectid = btrfs_ino(src);
2464 key.type = BTRFS_EXTENT_DATA_KEY;
2469 * note the key will change type as we walk through the
2472 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2476 nritems = btrfs_header_nritems(path->nodes[0]);
2477 if (path->slots[0] >= nritems) {
2478 ret = btrfs_next_leaf(root, path);
2483 nritems = btrfs_header_nritems(path->nodes[0]);
2485 leaf = path->nodes[0];
2486 slot = path->slots[0];
2488 btrfs_item_key_to_cpu(leaf, &key, slot);
2489 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
2490 key.objectid != btrfs_ino(src))
2493 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2494 struct btrfs_file_extent_item *extent;
2497 struct btrfs_key new_key;
2498 u64 disko = 0, diskl = 0;
2499 u64 datao = 0, datal = 0;
2503 size = btrfs_item_size_nr(leaf, slot);
2504 read_extent_buffer(leaf, buf,
2505 btrfs_item_ptr_offset(leaf, slot),
2508 extent = btrfs_item_ptr(leaf, slot,
2509 struct btrfs_file_extent_item);
2510 comp = btrfs_file_extent_compression(leaf, extent);
2511 type = btrfs_file_extent_type(leaf, extent);
2512 if (type == BTRFS_FILE_EXTENT_REG ||
2513 type == BTRFS_FILE_EXTENT_PREALLOC) {
2514 disko = btrfs_file_extent_disk_bytenr(leaf,
2516 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2518 datao = btrfs_file_extent_offset(leaf, extent);
2519 datal = btrfs_file_extent_num_bytes(leaf,
2521 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2522 /* take upper bound, may be compressed */
2523 datal = btrfs_file_extent_ram_bytes(leaf,
2526 btrfs_release_path(path);
2528 if (key.offset + datal <= off ||
2529 key.offset >= off+len)
2532 memcpy(&new_key, &key, sizeof(new_key));
2533 new_key.objectid = btrfs_ino(inode);
2534 if (off <= key.offset)
2535 new_key.offset = key.offset + destoff - off;
2537 new_key.offset = destoff;
2540 * 1 - adjusting old extent (we may have to split it)
2541 * 1 - add new extent
2544 trans = btrfs_start_transaction(root, 3);
2545 if (IS_ERR(trans)) {
2546 ret = PTR_ERR(trans);
2550 if (type == BTRFS_FILE_EXTENT_REG ||
2551 type == BTRFS_FILE_EXTENT_PREALLOC) {
2553 * a | --- range to clone ---| b
2554 * | ------------- extent ------------- |
2557 /* substract range b */
2558 if (key.offset + datal > off + len)
2559 datal = off + len - key.offset;
2561 /* substract range a */
2562 if (off > key.offset) {
2563 datao += off - key.offset;
2564 datal -= off - key.offset;
2567 ret = btrfs_drop_extents(trans, inode,
2569 new_key.offset + datal,
2572 btrfs_abort_transaction(trans, root,
2574 btrfs_end_transaction(trans, root);
2578 ret = btrfs_insert_empty_item(trans, root, path,
2581 btrfs_abort_transaction(trans, root,
2583 btrfs_end_transaction(trans, root);
2587 leaf = path->nodes[0];
2588 slot = path->slots[0];
2589 write_extent_buffer(leaf, buf,
2590 btrfs_item_ptr_offset(leaf, slot),
2593 extent = btrfs_item_ptr(leaf, slot,
2594 struct btrfs_file_extent_item);
2596 /* disko == 0 means it's a hole */
2600 btrfs_set_file_extent_offset(leaf, extent,
2602 btrfs_set_file_extent_num_bytes(leaf, extent,
2605 inode_add_bytes(inode, datal);
2606 ret = btrfs_inc_extent_ref(trans, root,
2608 root->root_key.objectid,
2610 new_key.offset - datao,
2613 btrfs_abort_transaction(trans,
2616 btrfs_end_transaction(trans,
2622 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2625 if (off > key.offset) {
2626 skip = off - key.offset;
2627 new_key.offset += skip;
2630 if (key.offset + datal > off+len)
2631 trim = key.offset + datal - (off+len);
2633 if (comp && (skip || trim)) {
2635 btrfs_end_transaction(trans, root);
2638 size -= skip + trim;
2639 datal -= skip + trim;
2641 ret = btrfs_drop_extents(trans, inode,
2643 new_key.offset + datal,
2646 btrfs_abort_transaction(trans, root,
2648 btrfs_end_transaction(trans, root);
2652 ret = btrfs_insert_empty_item(trans, root, path,
2655 btrfs_abort_transaction(trans, root,
2657 btrfs_end_transaction(trans, root);
2663 btrfs_file_extent_calc_inline_size(0);
2664 memmove(buf+start, buf+start+skip,
2668 leaf = path->nodes[0];
2669 slot = path->slots[0];
2670 write_extent_buffer(leaf, buf,
2671 btrfs_item_ptr_offset(leaf, slot),
2673 inode_add_bytes(inode, datal);
2676 btrfs_mark_buffer_dirty(leaf);
2677 btrfs_release_path(path);
2679 inode_inc_iversion(inode);
2680 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2683 * we round up to the block size at eof when
2684 * determining which extents to clone above,
2685 * but shouldn't round up the file size
2687 endoff = new_key.offset + datal;
2688 if (endoff > destoff+olen)
2689 endoff = destoff+olen;
2690 if (endoff > inode->i_size)
2691 btrfs_i_size_write(inode, endoff);
2693 ret = btrfs_update_inode(trans, root, inode);
2695 btrfs_abort_transaction(trans, root, ret);
2696 btrfs_end_transaction(trans, root);
2699 ret = btrfs_end_transaction(trans, root);
2702 btrfs_release_path(path);
2707 btrfs_release_path(path);
2708 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len);
2710 mutex_unlock(&src->i_mutex);
2711 mutex_unlock(&inode->i_mutex);
2713 btrfs_free_path(path);
2717 mnt_drop_write_file(file);
2721 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
2723 struct btrfs_ioctl_clone_range_args args;
2725 if (copy_from_user(&args, argp, sizeof(args)))
2727 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2728 args.src_length, args.dest_offset);
2732 * there are many ways the trans_start and trans_end ioctls can lead
2733 * to deadlocks. They should only be used by applications that
2734 * basically own the machine, and have a very in depth understanding
2735 * of all the possible deadlocks and enospc problems.
2737 static long btrfs_ioctl_trans_start(struct file *file)
2739 struct inode *inode = fdentry(file)->d_inode;
2740 struct btrfs_root *root = BTRFS_I(inode)->root;
2741 struct btrfs_trans_handle *trans;
2745 if (!capable(CAP_SYS_ADMIN))
2749 if (file->private_data)
2753 if (btrfs_root_readonly(root))
2756 ret = mnt_want_write_file(file);
2760 atomic_inc(&root->fs_info->open_ioctl_trans);
2763 trans = btrfs_start_ioctl_transaction(root);
2767 file->private_data = trans;
2771 atomic_dec(&root->fs_info->open_ioctl_trans);
2772 mnt_drop_write_file(file);
2777 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2779 struct inode *inode = fdentry(file)->d_inode;
2780 struct btrfs_root *root = BTRFS_I(inode)->root;
2781 struct btrfs_root *new_root;
2782 struct btrfs_dir_item *di;
2783 struct btrfs_trans_handle *trans;
2784 struct btrfs_path *path;
2785 struct btrfs_key location;
2786 struct btrfs_disk_key disk_key;
2787 struct btrfs_super_block *disk_super;
2792 if (!capable(CAP_SYS_ADMIN))
2795 if (copy_from_user(&objectid, argp, sizeof(objectid)))
2799 objectid = root->root_key.objectid;
2801 location.objectid = objectid;
2802 location.type = BTRFS_ROOT_ITEM_KEY;
2803 location.offset = (u64)-1;
2805 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
2806 if (IS_ERR(new_root))
2807 return PTR_ERR(new_root);
2809 if (btrfs_root_refs(&new_root->root_item) == 0)
2812 path = btrfs_alloc_path();
2815 path->leave_spinning = 1;
2817 trans = btrfs_start_transaction(root, 1);
2818 if (IS_ERR(trans)) {
2819 btrfs_free_path(path);
2820 return PTR_ERR(trans);
2823 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
2824 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
2825 dir_id, "default", 7, 1);
2826 if (IS_ERR_OR_NULL(di)) {
2827 btrfs_free_path(path);
2828 btrfs_end_transaction(trans, root);
2829 printk(KERN_ERR "Umm, you don't have the default dir item, "
2830 "this isn't going to work\n");
2834 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2835 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2836 btrfs_mark_buffer_dirty(path->nodes[0]);
2837 btrfs_free_path(path);
2839 disk_super = root->fs_info->super_copy;
2840 features = btrfs_super_incompat_flags(disk_super);
2841 if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) {
2842 features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL;
2843 btrfs_set_super_incompat_flags(disk_super, features);
2845 btrfs_end_transaction(trans, root);
2850 static void get_block_group_info(struct list_head *groups_list,
2851 struct btrfs_ioctl_space_info *space)
2853 struct btrfs_block_group_cache *block_group;
2855 space->total_bytes = 0;
2856 space->used_bytes = 0;
2858 list_for_each_entry(block_group, groups_list, list) {
2859 space->flags = block_group->flags;
2860 space->total_bytes += block_group->key.offset;
2861 space->used_bytes +=
2862 btrfs_block_group_used(&block_group->item);
2866 long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
2868 struct btrfs_ioctl_space_args space_args;
2869 struct btrfs_ioctl_space_info space;
2870 struct btrfs_ioctl_space_info *dest;
2871 struct btrfs_ioctl_space_info *dest_orig;
2872 struct btrfs_ioctl_space_info __user *user_dest;
2873 struct btrfs_space_info *info;
2874 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
2875 BTRFS_BLOCK_GROUP_SYSTEM,
2876 BTRFS_BLOCK_GROUP_METADATA,
2877 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
2884 if (copy_from_user(&space_args,
2885 (struct btrfs_ioctl_space_args __user *)arg,
2886 sizeof(space_args)))
2889 for (i = 0; i < num_types; i++) {
2890 struct btrfs_space_info *tmp;
2894 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2896 if (tmp->flags == types[i]) {
2906 down_read(&info->groups_sem);
2907 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
2908 if (!list_empty(&info->block_groups[c]))
2911 up_read(&info->groups_sem);
2914 /* space_slots == 0 means they are asking for a count */
2915 if (space_args.space_slots == 0) {
2916 space_args.total_spaces = slot_count;
2920 slot_count = min_t(u64, space_args.space_slots, slot_count);
2922 alloc_size = sizeof(*dest) * slot_count;
2924 /* we generally have at most 6 or so space infos, one for each raid
2925 * level. So, a whole page should be more than enough for everyone
2927 if (alloc_size > PAGE_CACHE_SIZE)
2930 space_args.total_spaces = 0;
2931 dest = kmalloc(alloc_size, GFP_NOFS);
2936 /* now we have a buffer to copy into */
2937 for (i = 0; i < num_types; i++) {
2938 struct btrfs_space_info *tmp;
2945 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2947 if (tmp->flags == types[i]) {
2956 down_read(&info->groups_sem);
2957 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
2958 if (!list_empty(&info->block_groups[c])) {
2959 get_block_group_info(&info->block_groups[c],
2961 memcpy(dest, &space, sizeof(space));
2963 space_args.total_spaces++;
2969 up_read(&info->groups_sem);
2972 user_dest = (struct btrfs_ioctl_space_info __user *)
2973 (arg + sizeof(struct btrfs_ioctl_space_args));
2975 if (copy_to_user(user_dest, dest_orig, alloc_size))
2980 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
2987 * there are many ways the trans_start and trans_end ioctls can lead
2988 * to deadlocks. They should only be used by applications that
2989 * basically own the machine, and have a very in depth understanding
2990 * of all the possible deadlocks and enospc problems.
2992 long btrfs_ioctl_trans_end(struct file *file)
2994 struct inode *inode = fdentry(file)->d_inode;
2995 struct btrfs_root *root = BTRFS_I(inode)->root;
2996 struct btrfs_trans_handle *trans;
2998 trans = file->private_data;
3001 file->private_data = NULL;
3003 btrfs_end_transaction(trans, root);
3005 atomic_dec(&root->fs_info->open_ioctl_trans);
3007 mnt_drop_write_file(file);
3011 static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp)
3013 struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
3014 struct btrfs_trans_handle *trans;
3018 trans = btrfs_start_transaction(root, 0);
3020 return PTR_ERR(trans);
3021 transid = trans->transid;
3022 ret = btrfs_commit_transaction_async(trans, root, 0);
3024 btrfs_end_transaction(trans, root);
3029 if (copy_to_user(argp, &transid, sizeof(transid)))
3034 static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
3036 struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
3040 if (copy_from_user(&transid, argp, sizeof(transid)))
3043 transid = 0; /* current trans */
3045 return btrfs_wait_for_commit(root, transid);
3048 static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
3051 struct btrfs_ioctl_scrub_args *sa;
3053 if (!capable(CAP_SYS_ADMIN))
3056 sa = memdup_user(arg, sizeof(*sa));
3060 ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end,
3061 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);
3063 if (copy_to_user(arg, sa, sizeof(*sa)))
3070 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3072 if (!capable(CAP_SYS_ADMIN))
3075 return btrfs_scrub_cancel(root);
3078 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3081 struct btrfs_ioctl_scrub_args *sa;
3084 if (!capable(CAP_SYS_ADMIN))
3087 sa = memdup_user(arg, sizeof(*sa));
3091 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3093 if (copy_to_user(arg, sa, sizeof(*sa)))
3100 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
3103 struct btrfs_ioctl_get_dev_stats *sa;
3106 sa = memdup_user(arg, sizeof(*sa));
3110 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3115 ret = btrfs_get_dev_stats(root, sa);
3117 if (copy_to_user(arg, sa, sizeof(*sa)))
3124 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3130 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3131 struct inode_fs_paths *ipath = NULL;
3132 struct btrfs_path *path;
3134 if (!capable(CAP_SYS_ADMIN))
3137 path = btrfs_alloc_path();
3143 ipa = memdup_user(arg, sizeof(*ipa));
3150 size = min_t(u32, ipa->size, 4096);
3151 ipath = init_ipath(size, root, path);
3152 if (IS_ERR(ipath)) {
3153 ret = PTR_ERR(ipath);
3158 ret = paths_from_inode(ipa->inum, ipath);
3162 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3163 rel_ptr = ipath->fspath->val[i] -
3164 (u64)(unsigned long)ipath->fspath->val;
3165 ipath->fspath->val[i] = rel_ptr;
3168 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3169 (void *)(unsigned long)ipath->fspath, size);
3176 btrfs_free_path(path);
3183 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3185 struct btrfs_data_container *inodes = ctx;
3186 const size_t c = 3 * sizeof(u64);
3188 if (inodes->bytes_left >= c) {
3189 inodes->bytes_left -= c;
3190 inodes->val[inodes->elem_cnt] = inum;
3191 inodes->val[inodes->elem_cnt + 1] = offset;
3192 inodes->val[inodes->elem_cnt + 2] = root;
3193 inodes->elem_cnt += 3;
3195 inodes->bytes_missing += c - inodes->bytes_left;
3196 inodes->bytes_left = 0;
3197 inodes->elem_missed += 3;
3203 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3208 u64 extent_item_pos;
3209 struct btrfs_ioctl_logical_ino_args *loi;
3210 struct btrfs_data_container *inodes = NULL;
3211 struct btrfs_path *path = NULL;
3212 struct btrfs_key key;
3214 if (!capable(CAP_SYS_ADMIN))
3217 loi = memdup_user(arg, sizeof(*loi));
3224 path = btrfs_alloc_path();
3230 size = min_t(u32, loi->size, 4096);
3231 inodes = init_data_container(size);
3232 if (IS_ERR(inodes)) {
3233 ret = PTR_ERR(inodes);
3238 ret = extent_from_logical(root->fs_info, loi->logical, path, &key);
3239 btrfs_release_path(path);
3241 if (ret & BTRFS_EXTENT_FLAG_TREE_BLOCK)
3246 extent_item_pos = loi->logical - key.objectid;
3247 ret = iterate_extent_inodes(root->fs_info, key.objectid,
3248 extent_item_pos, 0, build_ino_list,
3254 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3255 (void *)(unsigned long)inodes, size);
3260 btrfs_free_path(path);
3267 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3268 struct btrfs_ioctl_balance_args *bargs)
3270 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3272 bargs->flags = bctl->flags;
3274 if (atomic_read(&fs_info->balance_running))
3275 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3276 if (atomic_read(&fs_info->balance_pause_req))
3277 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3278 if (atomic_read(&fs_info->balance_cancel_req))
3279 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3281 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3282 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3283 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3286 spin_lock(&fs_info->balance_lock);
3287 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3288 spin_unlock(&fs_info->balance_lock);
3290 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3294 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3296 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3297 struct btrfs_fs_info *fs_info = root->fs_info;
3298 struct btrfs_ioctl_balance_args *bargs;
3299 struct btrfs_balance_control *bctl;
3302 if (!capable(CAP_SYS_ADMIN))
3305 ret = mnt_want_write_file(file);
3309 mutex_lock(&fs_info->volume_mutex);
3310 mutex_lock(&fs_info->balance_mutex);
3313 bargs = memdup_user(arg, sizeof(*bargs));
3314 if (IS_ERR(bargs)) {
3315 ret = PTR_ERR(bargs);
3319 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3320 if (!fs_info->balance_ctl) {
3325 bctl = fs_info->balance_ctl;
3326 spin_lock(&fs_info->balance_lock);
3327 bctl->flags |= BTRFS_BALANCE_RESUME;
3328 spin_unlock(&fs_info->balance_lock);
3336 if (fs_info->balance_ctl) {
3341 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3347 bctl->fs_info = fs_info;
3349 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3350 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3351 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3353 bctl->flags = bargs->flags;
3355 /* balance everything - no filters */
3356 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
3360 ret = btrfs_balance(bctl, bargs);
3362 * bctl is freed in __cancel_balance or in free_fs_info if
3363 * restriper was paused all the way until unmount
3366 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3373 mutex_unlock(&fs_info->balance_mutex);
3374 mutex_unlock(&fs_info->volume_mutex);
3375 mnt_drop_write_file(file);
3379 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3381 if (!capable(CAP_SYS_ADMIN))
3385 case BTRFS_BALANCE_CTL_PAUSE:
3386 return btrfs_pause_balance(root->fs_info);
3387 case BTRFS_BALANCE_CTL_CANCEL:
3388 return btrfs_cancel_balance(root->fs_info);
3394 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3397 struct btrfs_fs_info *fs_info = root->fs_info;
3398 struct btrfs_ioctl_balance_args *bargs;
3401 if (!capable(CAP_SYS_ADMIN))
3404 mutex_lock(&fs_info->balance_mutex);
3405 if (!fs_info->balance_ctl) {
3410 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3416 update_ioctl_balance_args(fs_info, 1, bargs);
3418 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3423 mutex_unlock(&fs_info->balance_mutex);
3427 static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg)
3429 struct btrfs_ioctl_quota_ctl_args *sa;
3430 struct btrfs_trans_handle *trans = NULL;
3434 if (!capable(CAP_SYS_ADMIN))
3437 if (root->fs_info->sb->s_flags & MS_RDONLY)
3440 sa = memdup_user(arg, sizeof(*sa));
3444 if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
3445 trans = btrfs_start_transaction(root, 2);
3446 if (IS_ERR(trans)) {
3447 ret = PTR_ERR(trans);
3453 case BTRFS_QUOTA_CTL_ENABLE:
3454 ret = btrfs_quota_enable(trans, root->fs_info);
3456 case BTRFS_QUOTA_CTL_DISABLE:
3457 ret = btrfs_quota_disable(trans, root->fs_info);
3459 case BTRFS_QUOTA_CTL_RESCAN:
3460 ret = btrfs_quota_rescan(root->fs_info);
3467 if (copy_to_user(arg, sa, sizeof(*sa)))
3471 err = btrfs_commit_transaction(trans, root);
3481 static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg)
3483 struct btrfs_ioctl_qgroup_assign_args *sa;
3484 struct btrfs_trans_handle *trans;
3488 if (!capable(CAP_SYS_ADMIN))
3491 if (root->fs_info->sb->s_flags & MS_RDONLY)
3494 sa = memdup_user(arg, sizeof(*sa));
3498 trans = btrfs_join_transaction(root);
3499 if (IS_ERR(trans)) {
3500 ret = PTR_ERR(trans);
3504 /* FIXME: check if the IDs really exist */
3506 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3509 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3513 err = btrfs_end_transaction(trans, root);
3522 static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg)
3524 struct btrfs_ioctl_qgroup_create_args *sa;
3525 struct btrfs_trans_handle *trans;
3529 if (!capable(CAP_SYS_ADMIN))
3532 if (root->fs_info->sb->s_flags & MS_RDONLY)
3535 sa = memdup_user(arg, sizeof(*sa));
3539 trans = btrfs_join_transaction(root);
3540 if (IS_ERR(trans)) {
3541 ret = PTR_ERR(trans);
3545 /* FIXME: check if the IDs really exist */
3547 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3550 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3553 err = btrfs_end_transaction(trans, root);
3562 static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg)
3564 struct btrfs_ioctl_qgroup_limit_args *sa;
3565 struct btrfs_trans_handle *trans;
3570 if (!capable(CAP_SYS_ADMIN))
3573 if (root->fs_info->sb->s_flags & MS_RDONLY)
3576 sa = memdup_user(arg, sizeof(*sa));
3580 trans = btrfs_join_transaction(root);
3581 if (IS_ERR(trans)) {
3582 ret = PTR_ERR(trans);
3586 qgroupid = sa->qgroupid;
3588 /* take the current subvol as qgroup */
3589 qgroupid = root->root_key.objectid;
3592 /* FIXME: check if the IDs really exist */
3593 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3595 err = btrfs_end_transaction(trans, root);
3604 long btrfs_ioctl(struct file *file, unsigned int
3605 cmd, unsigned long arg)
3607 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3608 void __user *argp = (void __user *)arg;
3611 case FS_IOC_GETFLAGS:
3612 return btrfs_ioctl_getflags(file, argp);
3613 case FS_IOC_SETFLAGS:
3614 return btrfs_ioctl_setflags(file, argp);
3615 case FS_IOC_GETVERSION:
3616 return btrfs_ioctl_getversion(file, argp);
3618 return btrfs_ioctl_fitrim(file, argp);
3619 case BTRFS_IOC_SNAP_CREATE:
3620 return btrfs_ioctl_snap_create(file, argp, 0);
3621 case BTRFS_IOC_SNAP_CREATE_V2:
3622 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3623 case BTRFS_IOC_SUBVOL_CREATE:
3624 return btrfs_ioctl_snap_create(file, argp, 1);
3625 case BTRFS_IOC_SUBVOL_CREATE_V2:
3626 return btrfs_ioctl_snap_create_v2(file, argp, 1);
3627 case BTRFS_IOC_SNAP_DESTROY:
3628 return btrfs_ioctl_snap_destroy(file, argp);
3629 case BTRFS_IOC_SUBVOL_GETFLAGS:
3630 return btrfs_ioctl_subvol_getflags(file, argp);
3631 case BTRFS_IOC_SUBVOL_SETFLAGS:
3632 return btrfs_ioctl_subvol_setflags(file, argp);
3633 case BTRFS_IOC_DEFAULT_SUBVOL:
3634 return btrfs_ioctl_default_subvol(file, argp);
3635 case BTRFS_IOC_DEFRAG:
3636 return btrfs_ioctl_defrag(file, NULL);
3637 case BTRFS_IOC_DEFRAG_RANGE:
3638 return btrfs_ioctl_defrag(file, argp);
3639 case BTRFS_IOC_RESIZE:
3640 return btrfs_ioctl_resize(root, argp);
3641 case BTRFS_IOC_ADD_DEV:
3642 return btrfs_ioctl_add_dev(root, argp);
3643 case BTRFS_IOC_RM_DEV:
3644 return btrfs_ioctl_rm_dev(root, argp);
3645 case BTRFS_IOC_FS_INFO:
3646 return btrfs_ioctl_fs_info(root, argp);
3647 case BTRFS_IOC_DEV_INFO:
3648 return btrfs_ioctl_dev_info(root, argp);
3649 case BTRFS_IOC_BALANCE:
3650 return btrfs_ioctl_balance(file, NULL);
3651 case BTRFS_IOC_CLONE:
3652 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
3653 case BTRFS_IOC_CLONE_RANGE:
3654 return btrfs_ioctl_clone_range(file, argp);
3655 case BTRFS_IOC_TRANS_START:
3656 return btrfs_ioctl_trans_start(file);
3657 case BTRFS_IOC_TRANS_END:
3658 return btrfs_ioctl_trans_end(file);
3659 case BTRFS_IOC_TREE_SEARCH:
3660 return btrfs_ioctl_tree_search(file, argp);
3661 case BTRFS_IOC_INO_LOOKUP:
3662 return btrfs_ioctl_ino_lookup(file, argp);
3663 case BTRFS_IOC_INO_PATHS:
3664 return btrfs_ioctl_ino_to_path(root, argp);
3665 case BTRFS_IOC_LOGICAL_INO:
3666 return btrfs_ioctl_logical_to_ino(root, argp);
3667 case BTRFS_IOC_SPACE_INFO:
3668 return btrfs_ioctl_space_info(root, argp);
3669 case BTRFS_IOC_SYNC:
3670 btrfs_sync_fs(file->f_dentry->d_sb, 1);
3672 case BTRFS_IOC_START_SYNC:
3673 return btrfs_ioctl_start_sync(file, argp);
3674 case BTRFS_IOC_WAIT_SYNC:
3675 return btrfs_ioctl_wait_sync(file, argp);
3676 case BTRFS_IOC_SCRUB:
3677 return btrfs_ioctl_scrub(root, argp);
3678 case BTRFS_IOC_SCRUB_CANCEL:
3679 return btrfs_ioctl_scrub_cancel(root, argp);
3680 case BTRFS_IOC_SCRUB_PROGRESS:
3681 return btrfs_ioctl_scrub_progress(root, argp);
3682 case BTRFS_IOC_BALANCE_V2:
3683 return btrfs_ioctl_balance(file, argp);
3684 case BTRFS_IOC_BALANCE_CTL:
3685 return btrfs_ioctl_balance_ctl(root, arg);
3686 case BTRFS_IOC_BALANCE_PROGRESS:
3687 return btrfs_ioctl_balance_progress(root, argp);
3688 case BTRFS_IOC_GET_DEV_STATS:
3689 return btrfs_ioctl_get_dev_stats(root, argp);
3690 case BTRFS_IOC_QUOTA_CTL:
3691 return btrfs_ioctl_quota_ctl(root, argp);
3692 case BTRFS_IOC_QGROUP_ASSIGN:
3693 return btrfs_ioctl_qgroup_assign(root, argp);
3694 case BTRFS_IOC_QGROUP_CREATE:
3695 return btrfs_ioctl_qgroup_create(root, argp);
3696 case BTRFS_IOC_QGROUP_LIMIT:
3697 return btrfs_ioctl_qgroup_limit(root, argp);