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"
52 /* Mask out flags that are inappropriate for the given type of inode. */
53 static inline __u32
btrfs_mask_flags(umode_t mode
, __u32 flags
)
57 else if (S_ISREG(mode
))
58 return flags
& ~FS_DIRSYNC_FL
;
60 return flags
& (FS_NODUMP_FL
| FS_NOATIME_FL
);
64 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
66 static unsigned int btrfs_flags_to_ioctl(unsigned int flags
)
68 unsigned int iflags
= 0;
70 if (flags
& BTRFS_INODE_SYNC
)
72 if (flags
& BTRFS_INODE_IMMUTABLE
)
73 iflags
|= FS_IMMUTABLE_FL
;
74 if (flags
& BTRFS_INODE_APPEND
)
75 iflags
|= FS_APPEND_FL
;
76 if (flags
& BTRFS_INODE_NODUMP
)
77 iflags
|= FS_NODUMP_FL
;
78 if (flags
& BTRFS_INODE_NOATIME
)
79 iflags
|= FS_NOATIME_FL
;
80 if (flags
& BTRFS_INODE_DIRSYNC
)
81 iflags
|= FS_DIRSYNC_FL
;
87 * Update inode->i_flags based on the btrfs internal flags.
89 void btrfs_update_iflags(struct inode
*inode
)
91 struct btrfs_inode
*ip
= BTRFS_I(inode
);
93 inode
->i_flags
&= ~(S_SYNC
|S_APPEND
|S_IMMUTABLE
|S_NOATIME
|S_DIRSYNC
);
95 if (ip
->flags
& BTRFS_INODE_SYNC
)
96 inode
->i_flags
|= S_SYNC
;
97 if (ip
->flags
& BTRFS_INODE_IMMUTABLE
)
98 inode
->i_flags
|= S_IMMUTABLE
;
99 if (ip
->flags
& BTRFS_INODE_APPEND
)
100 inode
->i_flags
|= S_APPEND
;
101 if (ip
->flags
& BTRFS_INODE_NOATIME
)
102 inode
->i_flags
|= S_NOATIME
;
103 if (ip
->flags
& BTRFS_INODE_DIRSYNC
)
104 inode
->i_flags
|= S_DIRSYNC
;
108 * Inherit flags from the parent inode.
110 * Unlike extN we don't have any flags we don't want to inherit currently.
112 void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
119 flags
= BTRFS_I(dir
)->flags
;
121 if (S_ISREG(inode
->i_mode
))
122 flags
&= ~BTRFS_INODE_DIRSYNC
;
123 else if (!S_ISDIR(inode
->i_mode
))
124 flags
&= (BTRFS_INODE_NODUMP
| BTRFS_INODE_NOATIME
);
126 BTRFS_I(inode
)->flags
= flags
;
127 btrfs_update_iflags(inode
);
130 static int btrfs_ioctl_getflags(struct file
*file
, void __user
*arg
)
132 struct btrfs_inode
*ip
= BTRFS_I(file
->f_path
.dentry
->d_inode
);
133 unsigned int flags
= btrfs_flags_to_ioctl(ip
->flags
);
135 if (copy_to_user(arg
, &flags
, sizeof(flags
)))
140 static int btrfs_ioctl_setflags(struct file
*file
, void __user
*arg
)
142 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
143 struct btrfs_inode
*ip
= BTRFS_I(inode
);
144 struct btrfs_root
*root
= ip
->root
;
145 struct btrfs_trans_handle
*trans
;
146 unsigned int flags
, oldflags
;
149 if (copy_from_user(&flags
, arg
, sizeof(flags
)))
152 if (flags
& ~(FS_IMMUTABLE_FL
| FS_APPEND_FL
| \
153 FS_NOATIME_FL
| FS_NODUMP_FL
| \
154 FS_SYNC_FL
| FS_DIRSYNC_FL
))
157 if (!is_owner_or_cap(inode
))
160 mutex_lock(&inode
->i_mutex
);
162 flags
= btrfs_mask_flags(inode
->i_mode
, flags
);
163 oldflags
= btrfs_flags_to_ioctl(ip
->flags
);
164 if ((flags
^ oldflags
) & (FS_APPEND_FL
| FS_IMMUTABLE_FL
)) {
165 if (!capable(CAP_LINUX_IMMUTABLE
)) {
171 ret
= mnt_want_write(file
->f_path
.mnt
);
175 if (flags
& FS_SYNC_FL
)
176 ip
->flags
|= BTRFS_INODE_SYNC
;
178 ip
->flags
&= ~BTRFS_INODE_SYNC
;
179 if (flags
& FS_IMMUTABLE_FL
)
180 ip
->flags
|= BTRFS_INODE_IMMUTABLE
;
182 ip
->flags
&= ~BTRFS_INODE_IMMUTABLE
;
183 if (flags
& FS_APPEND_FL
)
184 ip
->flags
|= BTRFS_INODE_APPEND
;
186 ip
->flags
&= ~BTRFS_INODE_APPEND
;
187 if (flags
& FS_NODUMP_FL
)
188 ip
->flags
|= BTRFS_INODE_NODUMP
;
190 ip
->flags
&= ~BTRFS_INODE_NODUMP
;
191 if (flags
& FS_NOATIME_FL
)
192 ip
->flags
|= BTRFS_INODE_NOATIME
;
194 ip
->flags
&= ~BTRFS_INODE_NOATIME
;
195 if (flags
& FS_DIRSYNC_FL
)
196 ip
->flags
|= BTRFS_INODE_DIRSYNC
;
198 ip
->flags
&= ~BTRFS_INODE_DIRSYNC
;
201 trans
= btrfs_join_transaction(root
, 1);
204 ret
= btrfs_update_inode(trans
, root
, inode
);
207 btrfs_update_iflags(inode
);
208 inode
->i_ctime
= CURRENT_TIME
;
209 btrfs_end_transaction(trans
, root
);
211 mnt_drop_write(file
->f_path
.mnt
);
213 mutex_unlock(&inode
->i_mutex
);
217 static int btrfs_ioctl_getversion(struct file
*file
, int __user
*arg
)
219 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
221 return put_user(inode
->i_generation
, arg
);
224 static noinline
int create_subvol(struct btrfs_root
*root
,
225 struct dentry
*dentry
,
226 char *name
, int namelen
)
228 struct btrfs_trans_handle
*trans
;
229 struct btrfs_key key
;
230 struct btrfs_root_item root_item
;
231 struct btrfs_inode_item
*inode_item
;
232 struct extent_buffer
*leaf
;
233 struct btrfs_root
*new_root
;
234 struct inode
*dir
= dentry
->d_parent
->d_inode
;
238 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
240 unsigned long nr
= 1;
242 ret
= btrfs_check_metadata_free_space(root
);
246 trans
= btrfs_start_transaction(root
, 1);
249 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
254 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
255 0, objectid
, NULL
, 0, 0, 0);
261 memset_extent_buffer(leaf
, 0, 0, sizeof(struct btrfs_header
));
262 btrfs_set_header_bytenr(leaf
, leaf
->start
);
263 btrfs_set_header_generation(leaf
, trans
->transid
);
264 btrfs_set_header_backref_rev(leaf
, BTRFS_MIXED_BACKREF_REV
);
265 btrfs_set_header_owner(leaf
, objectid
);
267 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
268 (unsigned long)btrfs_header_fsid(leaf
),
270 write_extent_buffer(leaf
, root
->fs_info
->chunk_tree_uuid
,
271 (unsigned long)btrfs_header_chunk_tree_uuid(leaf
),
273 btrfs_mark_buffer_dirty(leaf
);
275 inode_item
= &root_item
.inode
;
276 memset(inode_item
, 0, sizeof(*inode_item
));
277 inode_item
->generation
= cpu_to_le64(1);
278 inode_item
->size
= cpu_to_le64(3);
279 inode_item
->nlink
= cpu_to_le32(1);
280 inode_item
->nbytes
= cpu_to_le64(root
->leafsize
);
281 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
283 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
284 btrfs_set_root_generation(&root_item
, trans
->transid
);
285 btrfs_set_root_level(&root_item
, 0);
286 btrfs_set_root_refs(&root_item
, 1);
287 btrfs_set_root_used(&root_item
, 0);
288 btrfs_set_root_last_snapshot(&root_item
, 0);
290 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
291 root_item
.drop_level
= 0;
293 btrfs_tree_unlock(leaf
);
294 free_extent_buffer(leaf
);
297 btrfs_set_root_dirid(&root_item
, new_dirid
);
299 key
.objectid
= objectid
;
301 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
302 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
307 key
.offset
= (u64
)-1;
308 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, &key
);
309 BUG_ON(IS_ERR(new_root
));
311 btrfs_record_root_in_trans(trans
, new_root
);
313 ret
= btrfs_create_subvol_root(trans
, new_root
, new_dirid
,
314 BTRFS_I(dir
)->block_group
);
316 * insert the directory item
318 ret
= btrfs_set_inode_index(dir
, &index
);
321 ret
= btrfs_insert_dir_item(trans
, root
,
322 name
, namelen
, dir
->i_ino
, &key
,
323 BTRFS_FT_DIR
, index
);
327 btrfs_i_size_write(dir
, dir
->i_size
+ namelen
* 2);
328 ret
= btrfs_update_inode(trans
, root
, dir
);
331 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
332 objectid
, root
->root_key
.objectid
,
333 dir
->i_ino
, index
, name
, namelen
);
337 d_instantiate(dentry
, btrfs_lookup_dentry(dir
, dentry
));
339 nr
= trans
->blocks_used
;
340 err
= btrfs_commit_transaction(trans
, root
);
346 static int create_snapshot(struct btrfs_root
*root
, struct dentry
*dentry
,
347 char *name
, int namelen
)
349 struct btrfs_pending_snapshot
*pending_snapshot
;
350 struct btrfs_trans_handle
*trans
;
353 unsigned long nr
= 0;
358 ret
= btrfs_check_metadata_free_space(root
);
362 pending_snapshot
= kzalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
363 if (!pending_snapshot
) {
367 pending_snapshot
->name
= kmalloc(namelen
+ 1, GFP_NOFS
);
368 if (!pending_snapshot
->name
) {
370 kfree(pending_snapshot
);
373 memcpy(pending_snapshot
->name
, name
, namelen
);
374 pending_snapshot
->name
[namelen
] = '\0';
375 pending_snapshot
->dentry
= dentry
;
376 trans
= btrfs_start_transaction(root
, 1);
378 pending_snapshot
->root
= root
;
379 list_add(&pending_snapshot
->list
,
380 &trans
->transaction
->pending_snapshots
);
381 err
= btrfs_commit_transaction(trans
, root
);
384 btrfs_btree_balance_dirty(root
, nr
);
388 /* copy of may_create in fs/namei.c() */
389 static inline int btrfs_may_create(struct inode
*dir
, struct dentry
*child
)
395 return inode_permission(dir
, MAY_WRITE
| MAY_EXEC
);
399 * Create a new subvolume below @parent. This is largely modeled after
400 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
401 * inside this filesystem so it's quite a bit simpler.
403 static noinline
int btrfs_mksubvol(struct path
*parent
,
404 char *name
, int namelen
,
405 struct btrfs_root
*snap_src
)
407 struct inode
*dir
= parent
->dentry
->d_inode
;
408 struct dentry
*dentry
;
411 mutex_lock_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
413 dentry
= lookup_one_len(name
, parent
->dentry
, namelen
);
414 error
= PTR_ERR(dentry
);
422 error
= mnt_want_write(parent
->mnt
);
426 error
= btrfs_may_create(dir
, dentry
);
430 down_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
432 if (btrfs_root_refs(&BTRFS_I(dir
)->root
->root_item
) == 0)
436 error
= create_snapshot(snap_src
, dentry
,
439 error
= create_subvol(BTRFS_I(dir
)->root
, dentry
,
443 fsnotify_mkdir(dir
, dentry
);
445 up_read(&BTRFS_I(dir
)->root
->fs_info
->subvol_sem
);
447 mnt_drop_write(parent
->mnt
);
451 mutex_unlock(&dir
->i_mutex
);
455 static int btrfs_defrag_file(struct file
*file
)
457 struct inode
*inode
= fdentry(file
)->d_inode
;
458 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
459 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
460 struct btrfs_ordered_extent
*ordered
;
462 unsigned long last_index
;
463 unsigned long ra_pages
= root
->fs_info
->bdi
.ra_pages
;
464 unsigned long total_read
= 0;
470 ret
= btrfs_check_data_free_space(root
, inode
, inode
->i_size
);
474 mutex_lock(&inode
->i_mutex
);
475 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
476 for (i
= 0; i
<= last_index
; i
++) {
477 if (total_read
% ra_pages
== 0) {
478 btrfs_force_ra(inode
->i_mapping
, &file
->f_ra
, file
, i
,
479 min(last_index
, i
+ ra_pages
- 1));
483 page
= grab_cache_page(inode
->i_mapping
, i
);
486 if (!PageUptodate(page
)) {
487 btrfs_readpage(NULL
, page
);
489 if (!PageUptodate(page
)) {
491 page_cache_release(page
);
496 wait_on_page_writeback(page
);
498 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
499 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
500 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
502 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
504 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
506 page_cache_release(page
);
507 btrfs_start_ordered_extent(inode
, ordered
, 1);
508 btrfs_put_ordered_extent(ordered
);
511 set_page_extent_mapped(page
);
514 * this makes sure page_mkwrite is called on the
515 * page if it is dirtied again later
517 clear_page_dirty_for_io(page
);
519 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
520 set_page_dirty(page
);
521 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
523 page_cache_release(page
);
524 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
528 mutex_unlock(&inode
->i_mutex
);
532 static noinline
int btrfs_ioctl_resize(struct btrfs_root
*root
,
538 struct btrfs_ioctl_vol_args
*vol_args
;
539 struct btrfs_trans_handle
*trans
;
540 struct btrfs_device
*device
= NULL
;
547 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
550 if (!capable(CAP_SYS_ADMIN
))
553 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
554 if (IS_ERR(vol_args
))
555 return PTR_ERR(vol_args
);
557 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
558 namelen
= strlen(vol_args
->name
);
560 mutex_lock(&root
->fs_info
->volume_mutex
);
561 sizestr
= vol_args
->name
;
562 devstr
= strchr(sizestr
, ':');
565 sizestr
= devstr
+ 1;
567 devstr
= vol_args
->name
;
568 devid
= simple_strtoull(devstr
, &end
, 10);
569 printk(KERN_INFO
"resizing devid %llu\n",
570 (unsigned long long)devid
);
572 device
= btrfs_find_device(root
, devid
, NULL
, NULL
);
574 printk(KERN_INFO
"resizer unable to find device %llu\n",
575 (unsigned long long)devid
);
579 if (!strcmp(sizestr
, "max"))
580 new_size
= device
->bdev
->bd_inode
->i_size
;
582 if (sizestr
[0] == '-') {
585 } else if (sizestr
[0] == '+') {
589 new_size
= btrfs_parse_size(sizestr
);
596 old_size
= device
->total_bytes
;
599 if (new_size
> old_size
) {
603 new_size
= old_size
- new_size
;
604 } else if (mod
> 0) {
605 new_size
= old_size
+ new_size
;
608 if (new_size
< 256 * 1024 * 1024) {
612 if (new_size
> device
->bdev
->bd_inode
->i_size
) {
617 do_div(new_size
, root
->sectorsize
);
618 new_size
*= root
->sectorsize
;
620 printk(KERN_INFO
"new size for %s is %llu\n",
621 device
->name
, (unsigned long long)new_size
);
623 if (new_size
> old_size
) {
624 trans
= btrfs_start_transaction(root
, 1);
625 ret
= btrfs_grow_device(trans
, device
, new_size
);
626 btrfs_commit_transaction(trans
, root
);
628 ret
= btrfs_shrink_device(device
, new_size
);
632 mutex_unlock(&root
->fs_info
->volume_mutex
);
637 static noinline
int btrfs_ioctl_snap_create(struct file
*file
,
638 void __user
*arg
, int subvol
)
640 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
641 struct btrfs_ioctl_vol_args
*vol_args
;
642 struct file
*src_file
;
646 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
649 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
650 if (IS_ERR(vol_args
))
651 return PTR_ERR(vol_args
);
653 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
654 namelen
= strlen(vol_args
->name
);
655 if (strchr(vol_args
->name
, '/')) {
661 ret
= btrfs_mksubvol(&file
->f_path
, vol_args
->name
, namelen
,
664 struct inode
*src_inode
;
665 src_file
= fget(vol_args
->fd
);
671 src_inode
= src_file
->f_path
.dentry
->d_inode
;
672 if (src_inode
->i_sb
!= file
->f_path
.dentry
->d_inode
->i_sb
) {
673 printk(KERN_INFO
"btrfs: Snapshot src from "
679 ret
= btrfs_mksubvol(&file
->f_path
, vol_args
->name
, namelen
,
680 BTRFS_I(src_inode
)->root
);
689 * helper to check if the subvolume references other subvolumes
691 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
693 struct btrfs_path
*path
;
694 struct btrfs_key key
;
697 path
= btrfs_alloc_path();
701 key
.objectid
= root
->root_key
.objectid
;
702 key
.type
= BTRFS_ROOT_REF_KEY
;
703 key
.offset
= (u64
)-1;
705 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
,
712 if (path
->slots
[0] > 0) {
714 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
715 if (key
.objectid
== root
->root_key
.objectid
&&
716 key
.type
== BTRFS_ROOT_REF_KEY
)
720 btrfs_free_path(path
);
724 static noinline
int btrfs_ioctl_snap_destroy(struct file
*file
,
727 struct dentry
*parent
= fdentry(file
);
728 struct dentry
*dentry
;
729 struct inode
*dir
= parent
->d_inode
;
731 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
732 struct btrfs_root
*dest
= NULL
;
733 struct btrfs_ioctl_vol_args
*vol_args
;
734 struct btrfs_trans_handle
*trans
;
739 if (!capable(CAP_SYS_ADMIN
))
742 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
743 if (IS_ERR(vol_args
))
744 return PTR_ERR(vol_args
);
746 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
747 namelen
= strlen(vol_args
->name
);
748 if (strchr(vol_args
->name
, '/') ||
749 strncmp(vol_args
->name
, "..", namelen
) == 0) {
754 err
= mnt_want_write(file
->f_path
.mnt
);
758 mutex_lock_nested(&dir
->i_mutex
, I_MUTEX_PARENT
);
759 dentry
= lookup_one_len(vol_args
->name
, parent
, namelen
);
760 if (IS_ERR(dentry
)) {
761 err
= PTR_ERR(dentry
);
765 if (!dentry
->d_inode
) {
770 inode
= dentry
->d_inode
;
771 if (inode
->i_ino
!= BTRFS_FIRST_FREE_OBJECTID
) {
776 dest
= BTRFS_I(inode
)->root
;
778 mutex_lock(&inode
->i_mutex
);
779 err
= d_invalidate(dentry
);
783 down_write(&root
->fs_info
->subvol_sem
);
785 err
= may_destroy_subvol(dest
);
789 trans
= btrfs_start_transaction(root
, 1);
790 ret
= btrfs_unlink_subvol(trans
, root
, dir
,
791 dest
->root_key
.objectid
,
796 btrfs_record_root_in_trans(trans
, dest
);
798 memset(&dest
->root_item
.drop_progress
, 0,
799 sizeof(dest
->root_item
.drop_progress
));
800 dest
->root_item
.drop_level
= 0;
801 btrfs_set_root_refs(&dest
->root_item
, 0);
803 ret
= btrfs_insert_orphan_item(trans
,
804 root
->fs_info
->tree_root
,
805 dest
->root_key
.objectid
);
808 ret
= btrfs_commit_transaction(trans
, root
);
810 inode
->i_flags
|= S_DEAD
;
812 up_write(&root
->fs_info
->subvol_sem
);
814 mutex_unlock(&inode
->i_mutex
);
816 btrfs_invalidate_inodes(dest
);
822 mutex_unlock(&dir
->i_mutex
);
823 mnt_drop_write(file
->f_path
.mnt
);
829 static int btrfs_ioctl_defrag(struct file
*file
)
831 struct inode
*inode
= fdentry(file
)->d_inode
;
832 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
835 ret
= mnt_want_write(file
->f_path
.mnt
);
839 switch (inode
->i_mode
& S_IFMT
) {
841 if (!capable(CAP_SYS_ADMIN
)) {
845 btrfs_defrag_root(root
, 0);
846 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
849 if (!(file
->f_mode
& FMODE_WRITE
)) {
853 btrfs_defrag_file(file
);
857 mnt_drop_write(file
->f_path
.mnt
);
861 static long btrfs_ioctl_add_dev(struct btrfs_root
*root
, void __user
*arg
)
863 struct btrfs_ioctl_vol_args
*vol_args
;
866 if (!capable(CAP_SYS_ADMIN
))
869 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
870 if (IS_ERR(vol_args
))
871 return PTR_ERR(vol_args
);
873 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
874 ret
= btrfs_init_new_device(root
, vol_args
->name
);
880 static long btrfs_ioctl_rm_dev(struct btrfs_root
*root
, void __user
*arg
)
882 struct btrfs_ioctl_vol_args
*vol_args
;
885 if (!capable(CAP_SYS_ADMIN
))
888 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
891 vol_args
= memdup_user(arg
, sizeof(*vol_args
));
892 if (IS_ERR(vol_args
))
893 return PTR_ERR(vol_args
);
895 vol_args
->name
[BTRFS_PATH_NAME_MAX
] = '\0';
896 ret
= btrfs_rm_device(root
, vol_args
->name
);
902 static noinline
long btrfs_ioctl_clone(struct file
*file
, unsigned long srcfd
,
903 u64 off
, u64 olen
, u64 destoff
)
905 struct inode
*inode
= fdentry(file
)->d_inode
;
906 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
907 struct file
*src_file
;
909 struct btrfs_trans_handle
*trans
;
910 struct btrfs_path
*path
;
911 struct extent_buffer
*leaf
;
913 struct btrfs_key key
;
918 u64 bs
= root
->fs_info
->sb
->s_blocksize
;
923 * - split compressed inline extents. annoying: we need to
924 * decompress into destination's address_space (the file offset
925 * may change, so source mapping won't do), then recompress (or
926 * otherwise reinsert) a subrange.
927 * - allow ranges within the same file to be cloned (provided
928 * they don't overlap)?
931 /* the destination must be opened for writing */
932 if (!(file
->f_mode
& FMODE_WRITE
))
935 ret
= mnt_want_write(file
->f_path
.mnt
);
939 src_file
= fget(srcfd
);
944 src
= src_file
->f_dentry
->d_inode
;
951 if (S_ISDIR(src
->i_mode
) || S_ISDIR(inode
->i_mode
))
955 if (src
->i_sb
!= inode
->i_sb
|| BTRFS_I(src
)->root
!= root
)
959 buf
= vmalloc(btrfs_level_size(root
, 0));
963 path
= btrfs_alloc_path();
971 mutex_lock(&inode
->i_mutex
);
972 mutex_lock(&src
->i_mutex
);
974 mutex_lock(&src
->i_mutex
);
975 mutex_lock(&inode
->i_mutex
);
978 /* determine range to clone */
980 if (off
>= src
->i_size
|| off
+ len
> src
->i_size
)
983 olen
= len
= src
->i_size
- off
;
984 /* if we extend to eof, continue to block boundary */
985 if (off
+ len
== src
->i_size
)
986 len
= ((src
->i_size
+ bs
-1) & ~(bs
-1))
989 /* verify the end result is block aligned */
990 if ((off
& (bs
-1)) ||
991 ((off
+ len
) & (bs
-1)))
994 /* do any pending delalloc/csum calc on src, one way or
995 another, and lock file content */
997 struct btrfs_ordered_extent
*ordered
;
998 lock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+len
, GFP_NOFS
);
999 ordered
= btrfs_lookup_first_ordered_extent(inode
, off
+len
);
1000 if (BTRFS_I(src
)->delalloc_bytes
== 0 && !ordered
)
1002 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+len
, GFP_NOFS
);
1004 btrfs_put_ordered_extent(ordered
);
1005 btrfs_wait_ordered_range(src
, off
, off
+len
);
1008 trans
= btrfs_start_transaction(root
, 1);
1011 /* punch hole in destination first */
1012 btrfs_drop_extents(trans
, root
, inode
, off
, off
+ len
,
1013 off
+ len
, 0, &hint_byte
, 1);
1016 key
.objectid
= src
->i_ino
;
1017 key
.type
= BTRFS_EXTENT_DATA_KEY
;
1022 * note the key will change type as we walk through the
1025 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 0);
1029 nritems
= btrfs_header_nritems(path
->nodes
[0]);
1030 if (path
->slots
[0] >= nritems
) {
1031 ret
= btrfs_next_leaf(root
, path
);
1036 nritems
= btrfs_header_nritems(path
->nodes
[0]);
1038 leaf
= path
->nodes
[0];
1039 slot
= path
->slots
[0];
1041 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
1042 if (btrfs_key_type(&key
) > BTRFS_EXTENT_DATA_KEY
||
1043 key
.objectid
!= src
->i_ino
)
1046 if (btrfs_key_type(&key
) == BTRFS_EXTENT_DATA_KEY
) {
1047 struct btrfs_file_extent_item
*extent
;
1050 struct btrfs_key new_key
;
1051 u64 disko
= 0, diskl
= 0;
1052 u64 datao
= 0, datal
= 0;
1055 size
= btrfs_item_size_nr(leaf
, slot
);
1056 read_extent_buffer(leaf
, buf
,
1057 btrfs_item_ptr_offset(leaf
, slot
),
1060 extent
= btrfs_item_ptr(leaf
, slot
,
1061 struct btrfs_file_extent_item
);
1062 comp
= btrfs_file_extent_compression(leaf
, extent
);
1063 type
= btrfs_file_extent_type(leaf
, extent
);
1064 if (type
== BTRFS_FILE_EXTENT_REG
||
1065 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1066 disko
= btrfs_file_extent_disk_bytenr(leaf
,
1068 diskl
= btrfs_file_extent_disk_num_bytes(leaf
,
1070 datao
= btrfs_file_extent_offset(leaf
, extent
);
1071 datal
= btrfs_file_extent_num_bytes(leaf
,
1073 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
1074 /* take upper bound, may be compressed */
1075 datal
= btrfs_file_extent_ram_bytes(leaf
,
1078 btrfs_release_path(root
, path
);
1080 if (key
.offset
+ datal
< off
||
1081 key
.offset
>= off
+len
)
1084 memcpy(&new_key
, &key
, sizeof(new_key
));
1085 new_key
.objectid
= inode
->i_ino
;
1086 new_key
.offset
= key
.offset
+ destoff
- off
;
1088 if (type
== BTRFS_FILE_EXTENT_REG
||
1089 type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1090 ret
= btrfs_insert_empty_item(trans
, root
, path
,
1095 leaf
= path
->nodes
[0];
1096 slot
= path
->slots
[0];
1097 write_extent_buffer(leaf
, buf
,
1098 btrfs_item_ptr_offset(leaf
, slot
),
1101 extent
= btrfs_item_ptr(leaf
, slot
,
1102 struct btrfs_file_extent_item
);
1104 if (off
> key
.offset
) {
1105 datao
+= off
- key
.offset
;
1106 datal
-= off
- key
.offset
;
1108 if (key
.offset
+ datao
+ datal
> off
+ len
)
1109 datal
= off
+ len
- key
.offset
- datao
;
1110 /* disko == 0 means it's a hole */
1114 btrfs_set_file_extent_offset(leaf
, extent
,
1116 btrfs_set_file_extent_num_bytes(leaf
, extent
,
1119 inode_add_bytes(inode
, datal
);
1120 ret
= btrfs_inc_extent_ref(trans
, root
,
1122 root
->root_key
.objectid
,
1124 new_key
.offset
- datao
);
1127 } else if (type
== BTRFS_FILE_EXTENT_INLINE
) {
1130 if (off
> key
.offset
) {
1131 skip
= off
- key
.offset
;
1132 new_key
.offset
+= skip
;
1135 if (key
.offset
+ datal
> off
+len
)
1136 trim
= key
.offset
+ datal
- (off
+len
);
1138 if (comp
&& (skip
|| trim
)) {
1142 size
-= skip
+ trim
;
1143 datal
-= skip
+ trim
;
1144 ret
= btrfs_insert_empty_item(trans
, root
, path
,
1151 btrfs_file_extent_calc_inline_size(0);
1152 memmove(buf
+start
, buf
+start
+skip
,
1156 leaf
= path
->nodes
[0];
1157 slot
= path
->slots
[0];
1158 write_extent_buffer(leaf
, buf
,
1159 btrfs_item_ptr_offset(leaf
, slot
),
1161 inode_add_bytes(inode
, datal
);
1164 btrfs_mark_buffer_dirty(leaf
);
1168 btrfs_release_path(root
, path
);
1173 btrfs_release_path(root
, path
);
1175 inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
1176 if (destoff
+ olen
> inode
->i_size
)
1177 btrfs_i_size_write(inode
, destoff
+ olen
);
1178 BTRFS_I(inode
)->flags
= BTRFS_I(src
)->flags
;
1179 ret
= btrfs_update_inode(trans
, root
, inode
);
1181 btrfs_end_transaction(trans
, root
);
1182 unlock_extent(&BTRFS_I(src
)->io_tree
, off
, off
+len
, GFP_NOFS
);
1184 vmtruncate(inode
, 0);
1186 mutex_unlock(&src
->i_mutex
);
1187 mutex_unlock(&inode
->i_mutex
);
1189 btrfs_free_path(path
);
1193 mnt_drop_write(file
->f_path
.mnt
);
1197 static long btrfs_ioctl_clone_range(struct file
*file
, void __user
*argp
)
1199 struct btrfs_ioctl_clone_range_args args
;
1201 if (copy_from_user(&args
, argp
, sizeof(args
)))
1203 return btrfs_ioctl_clone(file
, args
.src_fd
, args
.src_offset
,
1204 args
.src_length
, args
.dest_offset
);
1208 * there are many ways the trans_start and trans_end ioctls can lead
1209 * to deadlocks. They should only be used by applications that
1210 * basically own the machine, and have a very in depth understanding
1211 * of all the possible deadlocks and enospc problems.
1213 static long btrfs_ioctl_trans_start(struct file
*file
)
1215 struct inode
*inode
= fdentry(file
)->d_inode
;
1216 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1217 struct btrfs_trans_handle
*trans
;
1220 if (!capable(CAP_SYS_ADMIN
))
1223 if (file
->private_data
) {
1228 ret
= mnt_want_write(file
->f_path
.mnt
);
1232 mutex_lock(&root
->fs_info
->trans_mutex
);
1233 root
->fs_info
->open_ioctl_trans
++;
1234 mutex_unlock(&root
->fs_info
->trans_mutex
);
1236 trans
= btrfs_start_ioctl_transaction(root
, 0);
1238 file
->private_data
= trans
;
1241 /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
1247 * there are many ways the trans_start and trans_end ioctls can lead
1248 * to deadlocks. They should only be used by applications that
1249 * basically own the machine, and have a very in depth understanding
1250 * of all the possible deadlocks and enospc problems.
1252 long btrfs_ioctl_trans_end(struct file
*file
)
1254 struct inode
*inode
= fdentry(file
)->d_inode
;
1255 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1256 struct btrfs_trans_handle
*trans
;
1259 trans
= file
->private_data
;
1264 btrfs_end_transaction(trans
, root
);
1265 file
->private_data
= NULL
;
1267 mutex_lock(&root
->fs_info
->trans_mutex
);
1268 root
->fs_info
->open_ioctl_trans
--;
1269 mutex_unlock(&root
->fs_info
->trans_mutex
);
1271 mnt_drop_write(file
->f_path
.mnt
);
1277 long btrfs_ioctl(struct file
*file
, unsigned int
1278 cmd
, unsigned long arg
)
1280 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
1281 void __user
*argp
= (void __user
*)arg
;
1284 case FS_IOC_GETFLAGS
:
1285 return btrfs_ioctl_getflags(file
, argp
);
1286 case FS_IOC_SETFLAGS
:
1287 return btrfs_ioctl_setflags(file
, argp
);
1288 case FS_IOC_GETVERSION
:
1289 return btrfs_ioctl_getversion(file
, argp
);
1290 case BTRFS_IOC_SNAP_CREATE
:
1291 return btrfs_ioctl_snap_create(file
, argp
, 0);
1292 case BTRFS_IOC_SUBVOL_CREATE
:
1293 return btrfs_ioctl_snap_create(file
, argp
, 1);
1294 case BTRFS_IOC_SNAP_DESTROY
:
1295 return btrfs_ioctl_snap_destroy(file
, argp
);
1296 case BTRFS_IOC_DEFRAG
:
1297 return btrfs_ioctl_defrag(file
);
1298 case BTRFS_IOC_RESIZE
:
1299 return btrfs_ioctl_resize(root
, argp
);
1300 case BTRFS_IOC_ADD_DEV
:
1301 return btrfs_ioctl_add_dev(root
, argp
);
1302 case BTRFS_IOC_RM_DEV
:
1303 return btrfs_ioctl_rm_dev(root
, argp
);
1304 case BTRFS_IOC_BALANCE
:
1305 return btrfs_balance(root
->fs_info
->dev_root
);
1306 case BTRFS_IOC_CLONE
:
1307 return btrfs_ioctl_clone(file
, arg
, 0, 0, 0);
1308 case BTRFS_IOC_CLONE_RANGE
:
1309 return btrfs_ioctl_clone_range(file
, argp
);
1310 case BTRFS_IOC_TRANS_START
:
1311 return btrfs_ioctl_trans_start(file
);
1312 case BTRFS_IOC_TRANS_END
:
1313 return btrfs_ioctl_trans_end(file
);
1314 case BTRFS_IOC_SYNC
:
1315 btrfs_sync_fs(file
->f_dentry
->d_sb
, 1);