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>
45 #include "transaction.h"
46 #include "btrfs_inode.h"
48 #include "print-tree.h"
53 /* Mask out flags that are inappropriate for the given type of inode. */
54 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
58 else if (S_ISREG(mode))
59 return flags & ~FS_DIRSYNC_FL;
61 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
65 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
67 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
69 unsigned int iflags = 0;
71 if (flags & BTRFS_INODE_SYNC)
73 if (flags & BTRFS_INODE_IMMUTABLE)
74 iflags |= FS_IMMUTABLE_FL;
75 if (flags & BTRFS_INODE_APPEND)
76 iflags |= FS_APPEND_FL;
77 if (flags & BTRFS_INODE_NODUMP)
78 iflags |= FS_NODUMP_FL;
79 if (flags & BTRFS_INODE_NOATIME)
80 iflags |= FS_NOATIME_FL;
81 if (flags & BTRFS_INODE_DIRSYNC)
82 iflags |= FS_DIRSYNC_FL;
88 * Update inode->i_flags based on the btrfs internal flags.
90 void btrfs_update_iflags(struct inode *inode)
92 struct btrfs_inode *ip = BTRFS_I(inode);
94 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
96 if (ip->flags & BTRFS_INODE_SYNC)
97 inode->i_flags |= S_SYNC;
98 if (ip->flags & BTRFS_INODE_IMMUTABLE)
99 inode->i_flags |= S_IMMUTABLE;
100 if (ip->flags & BTRFS_INODE_APPEND)
101 inode->i_flags |= S_APPEND;
102 if (ip->flags & BTRFS_INODE_NOATIME)
103 inode->i_flags |= S_NOATIME;
104 if (ip->flags & BTRFS_INODE_DIRSYNC)
105 inode->i_flags |= S_DIRSYNC;
109 * Inherit flags from the parent inode.
111 * Unlike extN we don't have any flags we don't want to inherit currently.
113 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
120 flags = BTRFS_I(dir)->flags;
122 if (S_ISREG(inode->i_mode))
123 flags &= ~BTRFS_INODE_DIRSYNC;
124 else if (!S_ISDIR(inode->i_mode))
125 flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME);
127 BTRFS_I(inode)->flags = flags;
128 btrfs_update_iflags(inode);
131 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
133 struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
134 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
136 if (copy_to_user(arg, &flags, sizeof(flags)))
141 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
143 struct inode *inode = file->f_path.dentry->d_inode;
144 struct btrfs_inode *ip = BTRFS_I(inode);
145 struct btrfs_root *root = ip->root;
146 struct btrfs_trans_handle *trans;
147 unsigned int flags, oldflags;
150 if (copy_from_user(&flags, arg, sizeof(flags)))
153 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
154 FS_NOATIME_FL | FS_NODUMP_FL | \
155 FS_SYNC_FL | FS_DIRSYNC_FL))
158 if (!is_owner_or_cap(inode))
161 mutex_lock(&inode->i_mutex);
163 flags = btrfs_mask_flags(inode->i_mode, flags);
164 oldflags = btrfs_flags_to_ioctl(ip->flags);
165 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
166 if (!capable(CAP_LINUX_IMMUTABLE)) {
172 ret = mnt_want_write(file->f_path.mnt);
176 if (flags & FS_SYNC_FL)
177 ip->flags |= BTRFS_INODE_SYNC;
179 ip->flags &= ~BTRFS_INODE_SYNC;
180 if (flags & FS_IMMUTABLE_FL)
181 ip->flags |= BTRFS_INODE_IMMUTABLE;
183 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
184 if (flags & FS_APPEND_FL)
185 ip->flags |= BTRFS_INODE_APPEND;
187 ip->flags &= ~BTRFS_INODE_APPEND;
188 if (flags & FS_NODUMP_FL)
189 ip->flags |= BTRFS_INODE_NODUMP;
191 ip->flags &= ~BTRFS_INODE_NODUMP;
192 if (flags & FS_NOATIME_FL)
193 ip->flags |= BTRFS_INODE_NOATIME;
195 ip->flags &= ~BTRFS_INODE_NOATIME;
196 if (flags & FS_DIRSYNC_FL)
197 ip->flags |= BTRFS_INODE_DIRSYNC;
199 ip->flags &= ~BTRFS_INODE_DIRSYNC;
202 trans = btrfs_join_transaction(root, 1);
205 ret = btrfs_update_inode(trans, root, inode);
208 btrfs_update_iflags(inode);
209 inode->i_ctime = CURRENT_TIME;
210 btrfs_end_transaction(trans, root);
212 mnt_drop_write(file->f_path.mnt);
214 mutex_unlock(&inode->i_mutex);
218 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
220 struct inode *inode = file->f_path.dentry->d_inode;
222 return put_user(inode->i_generation, arg);
225 static noinline int create_subvol(struct btrfs_root *root,
226 struct dentry *dentry,
227 char *name, int namelen)
229 struct btrfs_trans_handle *trans;
230 struct btrfs_key key;
231 struct btrfs_root_item root_item;
232 struct btrfs_inode_item *inode_item;
233 struct extent_buffer *leaf;
234 struct btrfs_root *new_root;
235 struct inode *dir = dentry->d_parent->d_inode;
239 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
248 ret = btrfs_reserve_metadata_space(root, 6);
252 trans = btrfs_start_transaction(root, 1);
255 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
260 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
261 0, objectid, NULL, 0, 0, 0);
267 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
268 btrfs_set_header_bytenr(leaf, leaf->start);
269 btrfs_set_header_generation(leaf, trans->transid);
270 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
271 btrfs_set_header_owner(leaf, objectid);
273 write_extent_buffer(leaf, root->fs_info->fsid,
274 (unsigned long)btrfs_header_fsid(leaf),
276 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
277 (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
279 btrfs_mark_buffer_dirty(leaf);
281 inode_item = &root_item.inode;
282 memset(inode_item, 0, sizeof(*inode_item));
283 inode_item->generation = cpu_to_le64(1);
284 inode_item->size = cpu_to_le64(3);
285 inode_item->nlink = cpu_to_le32(1);
286 inode_item->nbytes = cpu_to_le64(root->leafsize);
287 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
289 btrfs_set_root_bytenr(&root_item, leaf->start);
290 btrfs_set_root_generation(&root_item, trans->transid);
291 btrfs_set_root_level(&root_item, 0);
292 btrfs_set_root_refs(&root_item, 1);
293 btrfs_set_root_used(&root_item, leaf->len);
294 btrfs_set_root_last_snapshot(&root_item, 0);
296 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
297 root_item.drop_level = 0;
299 btrfs_tree_unlock(leaf);
300 free_extent_buffer(leaf);
303 btrfs_set_root_dirid(&root_item, new_dirid);
305 key.objectid = objectid;
307 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
308 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
313 key.offset = (u64)-1;
314 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
315 BUG_ON(IS_ERR(new_root));
317 btrfs_record_root_in_trans(trans, new_root);
319 ret = btrfs_create_subvol_root(trans, new_root, new_dirid,
320 BTRFS_I(dir)->block_group);
322 * insert the directory item
324 ret = btrfs_set_inode_index(dir, &index);
327 ret = btrfs_insert_dir_item(trans, root,
328 name, namelen, dir->i_ino, &key,
329 BTRFS_FT_DIR, index);
333 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
334 ret = btrfs_update_inode(trans, root, dir);
337 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
338 objectid, root->root_key.objectid,
339 dir->i_ino, index, name, namelen);
343 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
345 err = btrfs_commit_transaction(trans, root);
349 btrfs_unreserve_metadata_space(root, 6);
353 static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
354 char *name, int namelen)
357 struct btrfs_pending_snapshot *pending_snapshot;
358 struct btrfs_trans_handle *trans;
370 ret = btrfs_reserve_metadata_space(root, 6);
374 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
375 if (!pending_snapshot) {
377 btrfs_unreserve_metadata_space(root, 6);
380 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
381 if (!pending_snapshot->name) {
383 kfree(pending_snapshot);
384 btrfs_unreserve_metadata_space(root, 6);
387 memcpy(pending_snapshot->name, name, namelen);
388 pending_snapshot->name[namelen] = '\0';
389 pending_snapshot->dentry = dentry;
390 trans = btrfs_start_transaction(root, 1);
392 pending_snapshot->root = root;
393 list_add(&pending_snapshot->list,
394 &trans->transaction->pending_snapshots);
395 ret = btrfs_commit_transaction(trans, root);
397 btrfs_unreserve_metadata_space(root, 6);
399 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
401 ret = PTR_ERR(inode);
405 d_instantiate(dentry, inode);
411 /* copy of may_create in fs/namei.c() */
412 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
418 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
422 * Create a new subvolume below @parent. This is largely modeled after
423 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
424 * inside this filesystem so it's quite a bit simpler.
426 static noinline int btrfs_mksubvol(struct path *parent,
427 char *name, int namelen,
428 struct btrfs_root *snap_src)
430 struct inode *dir = parent->dentry->d_inode;
431 struct dentry *dentry;
434 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
436 dentry = lookup_one_len(name, parent->dentry, namelen);
437 error = PTR_ERR(dentry);
445 error = mnt_want_write(parent->mnt);
449 error = btrfs_may_create(dir, dentry);
453 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
455 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
459 error = create_snapshot(snap_src, dentry,
462 error = create_subvol(BTRFS_I(dir)->root, dentry,
466 fsnotify_mkdir(dir, dentry);
468 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
470 mnt_drop_write(parent->mnt);
474 mutex_unlock(&dir->i_mutex);
478 static int should_defrag_range(struct inode *inode, u64 start, u64 len,
479 int thresh, u64 *last_len, u64 *skip,
482 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
483 struct extent_map *em = NULL;
484 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
492 * make sure that once we start defragging and extent, we keep on
495 if (start < *defrag_end)
501 * hopefully we have this extent in the tree already, try without
502 * the full extent lock
504 read_lock(&em_tree->lock);
505 em = lookup_extent_mapping(em_tree, start, len);
506 read_unlock(&em_tree->lock);
509 /* get the big lock and read metadata off disk */
510 lock_extent(io_tree, start, start + len - 1, GFP_NOFS);
511 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
512 unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
518 /* this will cover holes, and inline extents */
519 if (em->block_start >= EXTENT_MAP_LAST_BYTE)
523 * we hit a real extent, if it is big don't bother defragging it again
525 if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh)
529 * last_len ends up being a counter of how many bytes we've defragged.
530 * every time we choose not to defrag an extent, we reset *last_len
531 * so that the next tiny extent will force a defrag.
533 * The end result of this is that tiny extents before a single big
534 * extent will force at least part of that big extent to be defragged.
538 *defrag_end = extent_map_end(em);
541 *skip = extent_map_end(em);
549 static int btrfs_defrag_file(struct file *file,
550 struct btrfs_ioctl_defrag_range_args *range)
552 struct inode *inode = fdentry(file)->d_inode;
553 struct btrfs_root *root = BTRFS_I(inode)->root;
554 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
555 struct btrfs_ordered_extent *ordered;
557 unsigned long last_index;
558 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
559 unsigned long total_read = 0;
568 if (inode->i_size == 0)
571 if (range->start + range->len > range->start) {
572 last_index = min_t(u64, inode->i_size - 1,
573 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
575 last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
578 i = range->start >> PAGE_CACHE_SHIFT;
579 while (i <= last_index) {
580 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
582 range->extent_thresh,
587 * the should_defrag function tells us how much to skip
588 * bump our counter by the suggested amount
590 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
591 i = max(i + 1, next);
595 if (total_read % ra_pages == 0) {
596 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
597 min(last_index, i + ra_pages - 1));
600 mutex_lock(&inode->i_mutex);
601 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
602 BTRFS_I(inode)->force_compress = 1;
604 ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE);
610 ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
612 btrfs_free_reserved_data_space(root, inode,
618 if (inode->i_size == 0 ||
619 i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) {
621 goto err_reservations;
624 page = grab_cache_page(inode->i_mapping, i);
626 goto err_reservations;
628 if (!PageUptodate(page)) {
629 btrfs_readpage(NULL, page);
631 if (!PageUptodate(page)) {
633 page_cache_release(page);
634 goto err_reservations;
638 if (page->mapping != inode->i_mapping) {
640 page_cache_release(page);
644 wait_on_page_writeback(page);
646 if (PageDirty(page)) {
647 btrfs_free_reserved_data_space(root, inode,
652 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
653 page_end = page_start + PAGE_CACHE_SIZE - 1;
654 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
656 ordered = btrfs_lookup_ordered_extent(inode, page_start);
658 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
660 page_cache_release(page);
661 btrfs_start_ordered_extent(inode, ordered, 1);
662 btrfs_put_ordered_extent(ordered);
665 set_page_extent_mapped(page);
668 * this makes sure page_mkwrite is called on the
669 * page if it is dirtied again later
671 clear_page_dirty_for_io(page);
672 clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start,
673 page_end, EXTENT_DIRTY | EXTENT_DELALLOC |
674 EXTENT_DO_ACCOUNTING, GFP_NOFS);
676 btrfs_set_extent_delalloc(inode, page_start, page_end, NULL);
677 ClearPageChecked(page);
678 set_page_dirty(page);
679 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
683 page_cache_release(page);
684 mutex_unlock(&inode->i_mutex);
686 btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
687 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
691 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
692 filemap_flush(inode->i_mapping);
694 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
695 /* the filemap_flush will queue IO into the worker threads, but
696 * we have to make sure the IO is actually started and that
697 * ordered extents get created before we return
699 atomic_inc(&root->fs_info->async_submit_draining);
700 while (atomic_read(&root->fs_info->nr_async_submits) ||
701 atomic_read(&root->fs_info->async_delalloc_pages)) {
702 wait_event(root->fs_info->async_submit_wait,
703 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
704 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
706 atomic_dec(&root->fs_info->async_submit_draining);
708 mutex_lock(&inode->i_mutex);
709 BTRFS_I(inode)->force_compress = 0;
710 mutex_unlock(&inode->i_mutex);
716 mutex_unlock(&inode->i_mutex);
717 btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
718 btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
722 static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
728 struct btrfs_ioctl_vol_args *vol_args;
729 struct btrfs_trans_handle *trans;
730 struct btrfs_device *device = NULL;
737 if (root->fs_info->sb->s_flags & MS_RDONLY)
740 if (!capable(CAP_SYS_ADMIN))
743 vol_args = memdup_user(arg, sizeof(*vol_args));
744 if (IS_ERR(vol_args))
745 return PTR_ERR(vol_args);
747 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
748 namelen = strlen(vol_args->name);
750 mutex_lock(&root->fs_info->volume_mutex);
751 sizestr = vol_args->name;
752 devstr = strchr(sizestr, ':');
755 sizestr = devstr + 1;
757 devstr = vol_args->name;
758 devid = simple_strtoull(devstr, &end, 10);
759 printk(KERN_INFO "resizing devid %llu\n",
760 (unsigned long long)devid);
762 device = btrfs_find_device(root, devid, NULL, NULL);
764 printk(KERN_INFO "resizer unable to find device %llu\n",
765 (unsigned long long)devid);
769 if (!strcmp(sizestr, "max"))
770 new_size = device->bdev->bd_inode->i_size;
772 if (sizestr[0] == '-') {
775 } else if (sizestr[0] == '+') {
779 new_size = memparse(sizestr, NULL);
786 old_size = device->total_bytes;
789 if (new_size > old_size) {
793 new_size = old_size - new_size;
794 } else if (mod > 0) {
795 new_size = old_size + new_size;
798 if (new_size < 256 * 1024 * 1024) {
802 if (new_size > device->bdev->bd_inode->i_size) {
807 do_div(new_size, root->sectorsize);
808 new_size *= root->sectorsize;
810 printk(KERN_INFO "new size for %s is %llu\n",
811 device->name, (unsigned long long)new_size);
813 if (new_size > old_size) {
814 trans = btrfs_start_transaction(root, 1);
815 ret = btrfs_grow_device(trans, device, new_size);
816 btrfs_commit_transaction(trans, root);
818 ret = btrfs_shrink_device(device, new_size);
822 mutex_unlock(&root->fs_info->volume_mutex);
827 static noinline int btrfs_ioctl_snap_create(struct file *file,
828 void __user *arg, int subvol)
830 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
831 struct btrfs_ioctl_vol_args *vol_args;
832 struct file *src_file;
836 if (root->fs_info->sb->s_flags & MS_RDONLY)
839 vol_args = memdup_user(arg, sizeof(*vol_args));
840 if (IS_ERR(vol_args))
841 return PTR_ERR(vol_args);
843 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
844 namelen = strlen(vol_args->name);
845 if (strchr(vol_args->name, '/')) {
851 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
854 struct inode *src_inode;
855 src_file = fget(vol_args->fd);
861 src_inode = src_file->f_path.dentry->d_inode;
862 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
863 printk(KERN_INFO "btrfs: Snapshot src from "
869 ret = btrfs_mksubvol(&file->f_path, vol_args->name, namelen,
870 BTRFS_I(src_inode)->root);
879 * helper to check if the subvolume references other subvolumes
881 static noinline int may_destroy_subvol(struct btrfs_root *root)
883 struct btrfs_path *path;
884 struct btrfs_key key;
887 path = btrfs_alloc_path();
891 key.objectid = root->root_key.objectid;
892 key.type = BTRFS_ROOT_REF_KEY;
893 key.offset = (u64)-1;
895 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
902 if (path->slots[0] > 0) {
904 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
905 if (key.objectid == root->root_key.objectid &&
906 key.type == BTRFS_ROOT_REF_KEY)
910 btrfs_free_path(path);
914 static noinline int key_in_sk(struct btrfs_key *key,
915 struct btrfs_ioctl_search_key *sk)
917 struct btrfs_key test;
920 test.objectid = sk->min_objectid;
921 test.type = sk->min_type;
922 test.offset = sk->min_offset;
924 ret = btrfs_comp_cpu_keys(key, &test);
928 test.objectid = sk->max_objectid;
929 test.type = sk->max_type;
930 test.offset = sk->max_offset;
932 ret = btrfs_comp_cpu_keys(key, &test);
938 static noinline int copy_to_sk(struct btrfs_root *root,
939 struct btrfs_path *path,
940 struct btrfs_key *key,
941 struct btrfs_ioctl_search_key *sk,
943 unsigned long *sk_offset,
947 struct extent_buffer *leaf;
948 struct btrfs_ioctl_search_header sh;
949 unsigned long item_off;
950 unsigned long item_len;
957 leaf = path->nodes[0];
958 slot = path->slots[0];
959 nritems = btrfs_header_nritems(leaf);
961 if (btrfs_header_generation(leaf) > sk->max_transid) {
965 found_transid = btrfs_header_generation(leaf);
967 for (i = slot; i < nritems; i++) {
968 item_off = btrfs_item_ptr_offset(leaf, i);
969 item_len = btrfs_item_size_nr(leaf, i);
971 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
974 if (sizeof(sh) + item_len + *sk_offset >
975 BTRFS_SEARCH_ARGS_BUFSIZE) {
980 btrfs_item_key_to_cpu(leaf, key, i);
981 if (!key_in_sk(key, sk))
984 sh.objectid = key->objectid;
985 sh.offset = key->offset;
988 sh.transid = found_transid;
990 /* copy search result header */
991 memcpy(buf + *sk_offset, &sh, sizeof(sh));
992 *sk_offset += sizeof(sh);
995 char *p = buf + *sk_offset;
997 read_extent_buffer(leaf, p,
999 *sk_offset += item_len;
1003 if (*num_found >= sk->nr_items)
1008 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
1010 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1013 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1020 *num_found += found;
1024 static noinline int search_ioctl(struct inode *inode,
1025 struct btrfs_ioctl_search_args *args)
1027 struct btrfs_root *root;
1028 struct btrfs_key key;
1029 struct btrfs_key max_key;
1030 struct btrfs_path *path;
1031 struct btrfs_ioctl_search_key *sk = &args->key;
1032 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1035 unsigned long sk_offset = 0;
1037 path = btrfs_alloc_path();
1041 if (sk->tree_id == 0) {
1042 /* search the root of the inode that was passed */
1043 root = BTRFS_I(inode)->root;
1045 key.objectid = sk->tree_id;
1046 key.type = BTRFS_ROOT_ITEM_KEY;
1047 key.offset = (u64)-1;
1048 root = btrfs_read_fs_root_no_name(info, &key);
1050 printk(KERN_ERR "could not find root %llu\n",
1052 btrfs_free_path(path);
1057 key.objectid = sk->min_objectid;
1058 key.type = sk->min_type;
1059 key.offset = sk->min_offset;
1061 max_key.objectid = sk->max_objectid;
1062 max_key.type = sk->max_type;
1063 max_key.offset = sk->max_offset;
1065 path->keep_locks = 1;
1068 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1075 ret = copy_to_sk(root, path, &key, sk, args->buf,
1076 &sk_offset, &num_found);
1077 btrfs_release_path(root, path);
1078 if (ret || num_found >= sk->nr_items)
1084 sk->nr_items = num_found;
1085 btrfs_free_path(path);
1089 static noinline int btrfs_ioctl_tree_search(struct file *file,
1092 struct btrfs_ioctl_search_args *args;
1093 struct inode *inode;
1096 if (!capable(CAP_SYS_ADMIN))
1099 args = kmalloc(sizeof(*args), GFP_KERNEL);
1103 if (copy_from_user(args, argp, sizeof(*args))) {
1107 inode = fdentry(file)->d_inode;
1108 ret = search_ioctl(inode, args);
1109 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1116 * Search INODE_REFs to identify path name of 'dirid' directory
1117 * in a 'tree_id' tree. and sets path name to 'name'.
1119 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1120 u64 tree_id, u64 dirid, char *name)
1122 struct btrfs_root *root;
1123 struct btrfs_key key;
1129 struct btrfs_inode_ref *iref;
1130 struct extent_buffer *l;
1131 struct btrfs_path *path;
1133 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1138 path = btrfs_alloc_path();
1142 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
1144 key.objectid = tree_id;
1145 key.type = BTRFS_ROOT_ITEM_KEY;
1146 key.offset = (u64)-1;
1147 root = btrfs_read_fs_root_no_name(info, &key);
1149 printk(KERN_ERR "could not find root %llu\n", tree_id);
1153 key.objectid = dirid;
1154 key.type = BTRFS_INODE_REF_KEY;
1158 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1163 slot = path->slots[0];
1164 btrfs_item_key_to_cpu(l, &key, slot);
1166 if (ret > 0 && (key.objectid != dirid ||
1167 key.type != BTRFS_INODE_REF_KEY)) {
1172 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1173 len = btrfs_inode_ref_name_len(l, iref);
1175 total_len += len + 1;
1180 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1182 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1185 btrfs_release_path(root, path);
1186 key.objectid = key.offset;
1188 dirid = key.objectid;
1193 memcpy(name, ptr, total_len);
1194 name[total_len]='\0';
1197 btrfs_free_path(path);
1201 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1204 struct btrfs_ioctl_ino_lookup_args *args;
1205 struct inode *inode;
1208 if (!capable(CAP_SYS_ADMIN))
1211 args = kmalloc(sizeof(*args), GFP_KERNEL);
1212 if (copy_from_user(args, argp, sizeof(*args))) {
1216 inode = fdentry(file)->d_inode;
1218 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
1219 args->treeid, args->objectid,
1222 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1229 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
1232 struct dentry *parent = fdentry(file);
1233 struct dentry *dentry;
1234 struct inode *dir = parent->d_inode;
1235 struct inode *inode;
1236 struct btrfs_root *root = BTRFS_I(dir)->root;
1237 struct btrfs_root *dest = NULL;
1238 struct btrfs_ioctl_vol_args *vol_args;
1239 struct btrfs_trans_handle *trans;
1244 if (!capable(CAP_SYS_ADMIN))
1247 vol_args = memdup_user(arg, sizeof(*vol_args));
1248 if (IS_ERR(vol_args))
1249 return PTR_ERR(vol_args);
1251 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1252 namelen = strlen(vol_args->name);
1253 if (strchr(vol_args->name, '/') ||
1254 strncmp(vol_args->name, "..", namelen) == 0) {
1259 err = mnt_want_write(file->f_path.mnt);
1263 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
1264 dentry = lookup_one_len(vol_args->name, parent, namelen);
1265 if (IS_ERR(dentry)) {
1266 err = PTR_ERR(dentry);
1267 goto out_unlock_dir;
1270 if (!dentry->d_inode) {
1275 inode = dentry->d_inode;
1276 if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) {
1281 dest = BTRFS_I(inode)->root;
1283 mutex_lock(&inode->i_mutex);
1284 err = d_invalidate(dentry);
1288 down_write(&root->fs_info->subvol_sem);
1290 err = may_destroy_subvol(dest);
1294 trans = btrfs_start_transaction(root, 1);
1295 ret = btrfs_unlink_subvol(trans, root, dir,
1296 dest->root_key.objectid,
1297 dentry->d_name.name,
1298 dentry->d_name.len);
1301 btrfs_record_root_in_trans(trans, dest);
1303 memset(&dest->root_item.drop_progress, 0,
1304 sizeof(dest->root_item.drop_progress));
1305 dest->root_item.drop_level = 0;
1306 btrfs_set_root_refs(&dest->root_item, 0);
1308 ret = btrfs_insert_orphan_item(trans,
1309 root->fs_info->tree_root,
1310 dest->root_key.objectid);
1313 ret = btrfs_commit_transaction(trans, root);
1315 inode->i_flags |= S_DEAD;
1317 up_write(&root->fs_info->subvol_sem);
1319 mutex_unlock(&inode->i_mutex);
1321 shrink_dcache_sb(root->fs_info->sb);
1322 btrfs_invalidate_inodes(dest);
1328 mutex_unlock(&dir->i_mutex);
1329 mnt_drop_write(file->f_path.mnt);
1335 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
1337 struct inode *inode = fdentry(file)->d_inode;
1338 struct btrfs_root *root = BTRFS_I(inode)->root;
1339 struct btrfs_ioctl_defrag_range_args *range;
1342 ret = mnt_want_write(file->f_path.mnt);
1346 switch (inode->i_mode & S_IFMT) {
1348 if (!capable(CAP_SYS_ADMIN)) {
1352 btrfs_defrag_root(root, 0);
1353 btrfs_defrag_root(root->fs_info->extent_root, 0);
1356 if (!(file->f_mode & FMODE_WRITE)) {
1361 range = kzalloc(sizeof(*range), GFP_KERNEL);
1368 if (copy_from_user(range, argp,
1373 /* compression requires us to start the IO */
1374 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1375 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
1376 range->extent_thresh = (u32)-1;
1379 /* the rest are all set to zero by kzalloc */
1380 range->len = (u64)-1;
1382 btrfs_defrag_file(file, range);
1387 mnt_drop_write(file->f_path.mnt);
1391 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
1393 struct btrfs_ioctl_vol_args *vol_args;
1396 if (!capable(CAP_SYS_ADMIN))
1399 vol_args = memdup_user(arg, sizeof(*vol_args));
1400 if (IS_ERR(vol_args))
1401 return PTR_ERR(vol_args);
1403 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1404 ret = btrfs_init_new_device(root, vol_args->name);
1410 static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
1412 struct btrfs_ioctl_vol_args *vol_args;
1415 if (!capable(CAP_SYS_ADMIN))
1418 if (root->fs_info->sb->s_flags & MS_RDONLY)
1421 vol_args = memdup_user(arg, sizeof(*vol_args));
1422 if (IS_ERR(vol_args))
1423 return PTR_ERR(vol_args);
1425 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1426 ret = btrfs_rm_device(root, vol_args->name);
1432 static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
1433 u64 off, u64 olen, u64 destoff)
1435 struct inode *inode = fdentry(file)->d_inode;
1436 struct btrfs_root *root = BTRFS_I(inode)->root;
1437 struct file *src_file;
1439 struct btrfs_trans_handle *trans;
1440 struct btrfs_path *path;
1441 struct extent_buffer *leaf;
1443 struct btrfs_key key;
1448 u64 bs = root->fs_info->sb->s_blocksize;
1453 * - split compressed inline extents. annoying: we need to
1454 * decompress into destination's address_space (the file offset
1455 * may change, so source mapping won't do), then recompress (or
1456 * otherwise reinsert) a subrange.
1457 * - allow ranges within the same file to be cloned (provided
1458 * they don't overlap)?
1461 /* the destination must be opened for writing */
1462 if (!(file->f_mode & FMODE_WRITE))
1465 ret = mnt_want_write(file->f_path.mnt);
1469 src_file = fget(srcfd);
1472 goto out_drop_write;
1474 src = src_file->f_dentry->d_inode;
1481 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
1485 if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
1489 buf = vmalloc(btrfs_level_size(root, 0));
1493 path = btrfs_alloc_path();
1501 mutex_lock(&inode->i_mutex);
1502 mutex_lock(&src->i_mutex);
1504 mutex_lock(&src->i_mutex);
1505 mutex_lock(&inode->i_mutex);
1508 /* determine range to clone */
1510 if (off >= src->i_size || off + len > src->i_size)
1513 olen = len = src->i_size - off;
1514 /* if we extend to eof, continue to block boundary */
1515 if (off + len == src->i_size)
1516 len = ((src->i_size + bs-1) & ~(bs-1))
1519 /* verify the end result is block aligned */
1520 if ((off & (bs-1)) ||
1521 ((off + len) & (bs-1)))
1524 /* do any pending delalloc/csum calc on src, one way or
1525 another, and lock file content */
1527 struct btrfs_ordered_extent *ordered;
1528 lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1529 ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
1530 if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
1532 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1534 btrfs_put_ordered_extent(ordered);
1535 btrfs_wait_ordered_range(src, off, off+len);
1538 trans = btrfs_start_transaction(root, 1);
1541 /* punch hole in destination first */
1542 btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1);
1545 key.objectid = src->i_ino;
1546 key.type = BTRFS_EXTENT_DATA_KEY;
1551 * note the key will change type as we walk through the
1554 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
1558 nritems = btrfs_header_nritems(path->nodes[0]);
1559 if (path->slots[0] >= nritems) {
1560 ret = btrfs_next_leaf(root, path);
1565 nritems = btrfs_header_nritems(path->nodes[0]);
1567 leaf = path->nodes[0];
1568 slot = path->slots[0];
1570 btrfs_item_key_to_cpu(leaf, &key, slot);
1571 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
1572 key.objectid != src->i_ino)
1575 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
1576 struct btrfs_file_extent_item *extent;
1579 struct btrfs_key new_key;
1580 u64 disko = 0, diskl = 0;
1581 u64 datao = 0, datal = 0;
1584 size = btrfs_item_size_nr(leaf, slot);
1585 read_extent_buffer(leaf, buf,
1586 btrfs_item_ptr_offset(leaf, slot),
1589 extent = btrfs_item_ptr(leaf, slot,
1590 struct btrfs_file_extent_item);
1591 comp = btrfs_file_extent_compression(leaf, extent);
1592 type = btrfs_file_extent_type(leaf, extent);
1593 if (type == BTRFS_FILE_EXTENT_REG ||
1594 type == BTRFS_FILE_EXTENT_PREALLOC) {
1595 disko = btrfs_file_extent_disk_bytenr(leaf,
1597 diskl = btrfs_file_extent_disk_num_bytes(leaf,
1599 datao = btrfs_file_extent_offset(leaf, extent);
1600 datal = btrfs_file_extent_num_bytes(leaf,
1602 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1603 /* take upper bound, may be compressed */
1604 datal = btrfs_file_extent_ram_bytes(leaf,
1607 btrfs_release_path(root, path);
1609 if (key.offset + datal < off ||
1610 key.offset >= off+len)
1613 memcpy(&new_key, &key, sizeof(new_key));
1614 new_key.objectid = inode->i_ino;
1615 new_key.offset = key.offset + destoff - off;
1617 if (type == BTRFS_FILE_EXTENT_REG ||
1618 type == BTRFS_FILE_EXTENT_PREALLOC) {
1619 ret = btrfs_insert_empty_item(trans, root, path,
1624 leaf = path->nodes[0];
1625 slot = path->slots[0];
1626 write_extent_buffer(leaf, buf,
1627 btrfs_item_ptr_offset(leaf, slot),
1630 extent = btrfs_item_ptr(leaf, slot,
1631 struct btrfs_file_extent_item);
1633 if (off > key.offset) {
1634 datao += off - key.offset;
1635 datal -= off - key.offset;
1638 if (key.offset + datal > off + len)
1639 datal = off + len - key.offset;
1641 /* disko == 0 means it's a hole */
1645 btrfs_set_file_extent_offset(leaf, extent,
1647 btrfs_set_file_extent_num_bytes(leaf, extent,
1650 inode_add_bytes(inode, datal);
1651 ret = btrfs_inc_extent_ref(trans, root,
1653 root->root_key.objectid,
1655 new_key.offset - datao);
1658 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1661 if (off > key.offset) {
1662 skip = off - key.offset;
1663 new_key.offset += skip;
1666 if (key.offset + datal > off+len)
1667 trim = key.offset + datal - (off+len);
1669 if (comp && (skip || trim)) {
1673 size -= skip + trim;
1674 datal -= skip + trim;
1675 ret = btrfs_insert_empty_item(trans, root, path,
1682 btrfs_file_extent_calc_inline_size(0);
1683 memmove(buf+start, buf+start+skip,
1687 leaf = path->nodes[0];
1688 slot = path->slots[0];
1689 write_extent_buffer(leaf, buf,
1690 btrfs_item_ptr_offset(leaf, slot),
1692 inode_add_bytes(inode, datal);
1695 btrfs_mark_buffer_dirty(leaf);
1699 btrfs_release_path(root, path);
1704 btrfs_release_path(root, path);
1706 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1707 if (destoff + olen > inode->i_size)
1708 btrfs_i_size_write(inode, destoff + olen);
1709 BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
1710 ret = btrfs_update_inode(trans, root, inode);
1712 btrfs_end_transaction(trans, root);
1713 unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
1715 vmtruncate(inode, 0);
1717 mutex_unlock(&src->i_mutex);
1718 mutex_unlock(&inode->i_mutex);
1720 btrfs_free_path(path);
1724 mnt_drop_write(file->f_path.mnt);
1728 static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
1730 struct btrfs_ioctl_clone_range_args args;
1732 if (copy_from_user(&args, argp, sizeof(args)))
1734 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
1735 args.src_length, args.dest_offset);
1739 * there are many ways the trans_start and trans_end ioctls can lead
1740 * to deadlocks. They should only be used by applications that
1741 * basically own the machine, and have a very in depth understanding
1742 * of all the possible deadlocks and enospc problems.
1744 static long btrfs_ioctl_trans_start(struct file *file)
1746 struct inode *inode = fdentry(file)->d_inode;
1747 struct btrfs_root *root = BTRFS_I(inode)->root;
1748 struct btrfs_trans_handle *trans;
1752 if (!capable(CAP_SYS_ADMIN))
1756 if (file->private_data)
1759 ret = mnt_want_write(file->f_path.mnt);
1763 mutex_lock(&root->fs_info->trans_mutex);
1764 root->fs_info->open_ioctl_trans++;
1765 mutex_unlock(&root->fs_info->trans_mutex);
1768 trans = btrfs_start_ioctl_transaction(root, 0);
1772 file->private_data = trans;
1776 mutex_lock(&root->fs_info->trans_mutex);
1777 root->fs_info->open_ioctl_trans--;
1778 mutex_unlock(&root->fs_info->trans_mutex);
1779 mnt_drop_write(file->f_path.mnt);
1784 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
1786 struct inode *inode = fdentry(file)->d_inode;
1787 struct btrfs_root *root = BTRFS_I(inode)->root;
1788 struct btrfs_root *new_root;
1789 struct btrfs_dir_item *di;
1790 struct btrfs_trans_handle *trans;
1791 struct btrfs_path *path;
1792 struct btrfs_key location;
1793 struct btrfs_disk_key disk_key;
1794 struct btrfs_super_block *disk_super;
1799 if (!capable(CAP_SYS_ADMIN))
1802 if (copy_from_user(&objectid, argp, sizeof(objectid)))
1806 objectid = root->root_key.objectid;
1808 location.objectid = objectid;
1809 location.type = BTRFS_ROOT_ITEM_KEY;
1810 location.offset = (u64)-1;
1812 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
1813 if (IS_ERR(new_root))
1814 return PTR_ERR(new_root);
1816 if (btrfs_root_refs(&new_root->root_item) == 0)
1819 path = btrfs_alloc_path();
1822 path->leave_spinning = 1;
1824 trans = btrfs_start_transaction(root, 1);
1826 btrfs_free_path(path);
1830 dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
1831 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
1832 dir_id, "default", 7, 1);
1834 btrfs_free_path(path);
1835 btrfs_end_transaction(trans, root);
1836 printk(KERN_ERR "Umm, you don't have the default dir item, "
1837 "this isn't going to work\n");
1841 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
1842 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
1843 btrfs_mark_buffer_dirty(path->nodes[0]);
1844 btrfs_free_path(path);
1846 disk_super = &root->fs_info->super_copy;
1847 features = btrfs_super_incompat_flags(disk_super);
1848 if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) {
1849 features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL;
1850 btrfs_set_super_incompat_flags(disk_super, features);
1852 btrfs_end_transaction(trans, root);
1857 long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1859 struct btrfs_ioctl_space_args space_args;
1860 struct btrfs_ioctl_space_info space;
1861 struct btrfs_ioctl_space_info *dest;
1862 struct btrfs_ioctl_space_info *dest_orig;
1863 struct btrfs_ioctl_space_info *user_dest;
1864 struct btrfs_space_info *info;
1869 if (copy_from_user(&space_args,
1870 (struct btrfs_ioctl_space_args __user *)arg,
1871 sizeof(space_args)))
1874 /* first we count slots */
1876 list_for_each_entry_rcu(info, &root->fs_info->space_info, list)
1880 /* space_slots == 0 means they are asking for a count */
1881 if (space_args.space_slots == 0) {
1882 space_args.total_spaces = slot_count;
1885 alloc_size = sizeof(*dest) * slot_count;
1886 /* we generally have at most 6 or so space infos, one for each raid
1887 * level. So, a whole page should be more than enough for everyone
1889 if (alloc_size > PAGE_CACHE_SIZE)
1892 space_args.total_spaces = 0;
1893 dest = kmalloc(alloc_size, GFP_NOFS);
1898 /* now we have a buffer to copy into */
1900 list_for_each_entry_rcu(info, &root->fs_info->space_info, list) {
1901 /* make sure we don't copy more than we allocated
1904 if (slot_count == 0)
1908 /* make sure userland has enough room in their buffer */
1909 if (space_args.total_spaces >= space_args.space_slots)
1912 space.flags = info->flags;
1913 space.total_bytes = info->total_bytes;
1914 space.used_bytes = info->bytes_used;
1915 memcpy(dest, &space, sizeof(space));
1917 space_args.total_spaces++;
1921 user_dest = (struct btrfs_ioctl_space_info *)
1922 (arg + sizeof(struct btrfs_ioctl_space_args));
1924 if (copy_to_user(user_dest, dest_orig, alloc_size))
1929 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1936 * there are many ways the trans_start and trans_end ioctls can lead
1937 * to deadlocks. They should only be used by applications that
1938 * basically own the machine, and have a very in depth understanding
1939 * of all the possible deadlocks and enospc problems.
1941 long btrfs_ioctl_trans_end(struct file *file)
1943 struct inode *inode = fdentry(file)->d_inode;
1944 struct btrfs_root *root = BTRFS_I(inode)->root;
1945 struct btrfs_trans_handle *trans;
1947 trans = file->private_data;
1950 file->private_data = NULL;
1952 btrfs_end_transaction(trans, root);
1954 mutex_lock(&root->fs_info->trans_mutex);
1955 root->fs_info->open_ioctl_trans--;
1956 mutex_unlock(&root->fs_info->trans_mutex);
1958 mnt_drop_write(file->f_path.mnt);
1962 long btrfs_ioctl(struct file *file, unsigned int
1963 cmd, unsigned long arg)
1965 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
1966 void __user *argp = (void __user *)arg;
1969 case FS_IOC_GETFLAGS:
1970 return btrfs_ioctl_getflags(file, argp);
1971 case FS_IOC_SETFLAGS:
1972 return btrfs_ioctl_setflags(file, argp);
1973 case FS_IOC_GETVERSION:
1974 return btrfs_ioctl_getversion(file, argp);
1975 case BTRFS_IOC_SNAP_CREATE:
1976 return btrfs_ioctl_snap_create(file, argp, 0);
1977 case BTRFS_IOC_SUBVOL_CREATE:
1978 return btrfs_ioctl_snap_create(file, argp, 1);
1979 case BTRFS_IOC_SNAP_DESTROY:
1980 return btrfs_ioctl_snap_destroy(file, argp);
1981 case BTRFS_IOC_DEFAULT_SUBVOL:
1982 return btrfs_ioctl_default_subvol(file, argp);
1983 case BTRFS_IOC_DEFRAG:
1984 return btrfs_ioctl_defrag(file, NULL);
1985 case BTRFS_IOC_DEFRAG_RANGE:
1986 return btrfs_ioctl_defrag(file, argp);
1987 case BTRFS_IOC_RESIZE:
1988 return btrfs_ioctl_resize(root, argp);
1989 case BTRFS_IOC_ADD_DEV:
1990 return btrfs_ioctl_add_dev(root, argp);
1991 case BTRFS_IOC_RM_DEV:
1992 return btrfs_ioctl_rm_dev(root, argp);
1993 case BTRFS_IOC_BALANCE:
1994 return btrfs_balance(root->fs_info->dev_root);
1995 case BTRFS_IOC_CLONE:
1996 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
1997 case BTRFS_IOC_CLONE_RANGE:
1998 return btrfs_ioctl_clone_range(file, argp);
1999 case BTRFS_IOC_TRANS_START:
2000 return btrfs_ioctl_trans_start(file);
2001 case BTRFS_IOC_TRANS_END:
2002 return btrfs_ioctl_trans_end(file);
2003 case BTRFS_IOC_TREE_SEARCH:
2004 return btrfs_ioctl_tree_search(file, argp);
2005 case BTRFS_IOC_INO_LOOKUP:
2006 return btrfs_ioctl_ino_lookup(file, argp);
2007 case BTRFS_IOC_SPACE_INFO:
2008 return btrfs_ioctl_space_info(root, argp);
2009 case BTRFS_IOC_SYNC:
2010 btrfs_sync_fs(file->f_dentry->d_sb, 1);