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btrfs: fix uninit variable warning
[mirror_ubuntu-hirsute-kernel.git] / fs / btrfs / ioctl.c
CommitLineData
f46b5a66
CH		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19#include <linux/kernel.h>
20#include <linux/bio.h>
21#include <linux/buffer_head.h>
22#include <linux/file.h>
23#include <linux/fs.h>
cb8e7090 24#include <linux/fsnotify.h>
f46b5a66
CH		 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>
f46b5a66 30#include <linux/backing-dev.h>
cb8e7090 31#include <linux/mount.h>
f46b5a66 32#include <linux/mpage.h>
cb8e7090 33#include <linux/namei.h>
f46b5a66
CH		 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>
cb8e7090 39#include <linux/security.h>
f46b5a66 40#include <linux/xattr.h>
7ea394f1 41#include <linux/vmalloc.h>
5a0e3ad6 42#include <linux/slab.h>
f7039b1d 43#include <linux/blkdev.h>
8ea05e3a 44#include <linux/uuid.h>
55e301fd 45#include <linux/btrfs.h>
416161db 46#include <linux/uaccess.h>
f46b5a66
CH		 47#include "ctree.h"
48#include "disk-io.h"
49#include "transaction.h"
50#include "btrfs_inode.h"
f46b5a66
CH		 51#include "print-tree.h"
52#include "volumes.h"
925baedd 53#include "locking.h"
581bb050 54#include "inode-map.h"
d7728c96 55#include "backref.h"
606686ee 56#include "rcu-string.h"
31db9f7c 57#include "send.h"
3f6bcfbd 58#include "dev-replace.h"
63541927 59#include "props.h"
3b02a68a 60#include "sysfs.h"
f46b5a66 61
abccd00f
HM		 62#ifdef CONFIG_64BIT
63/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
64 * structures are incorrect, as the timespec structure from userspace
65 * is 4 bytes too small. We define these alternatives here to teach
66 * the kernel about the 32-bit struct packing.
67 */
68struct btrfs_ioctl_timespec_32 {
69 __u64 sec;
70 __u32 nsec;
71} __attribute__ ((__packed__));
72
73struct btrfs_ioctl_received_subvol_args_32 {
74 char uuid[BTRFS_UUID_SIZE]; /* in */
75 __u64 stransid; /* in */
76 __u64 rtransid; /* out */
77 struct btrfs_ioctl_timespec_32 stime; /* in */
78 struct btrfs_ioctl_timespec_32 rtime; /* out */
79 __u64 flags; /* in */
80 __u64 reserved[16]; /* in */
81} __attribute__ ((__packed__));
82
83#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
84 struct btrfs_ioctl_received_subvol_args_32)
85#endif
86
87
416161db
MF		 88static int btrfs_clone(struct inode *src, struct inode *inode,
89 u64 off, u64 olen, u64 olen_aligned, u64 destoff);
90
6cbff00f
CH		 91/* Mask out flags that are inappropriate for the given type of inode. */
92static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
93{
94 if (S_ISDIR(mode))
95 return flags;
96 else if (S_ISREG(mode))
97 return flags & ~FS_DIRSYNC_FL;
98 else
99 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
100}
101
102/*
103 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
104 */
105static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
106{
107 unsigned int iflags = 0;
108
109 if (flags & BTRFS_INODE_SYNC)
110 iflags |= FS_SYNC_FL;
111 if (flags & BTRFS_INODE_IMMUTABLE)
112 iflags |= FS_IMMUTABLE_FL;
113 if (flags & BTRFS_INODE_APPEND)
114 iflags |= FS_APPEND_FL;
115 if (flags & BTRFS_INODE_NODUMP)
116 iflags |= FS_NODUMP_FL;
117 if (flags & BTRFS_INODE_NOATIME)
118 iflags |= FS_NOATIME_FL;
119 if (flags & BTRFS_INODE_DIRSYNC)
120 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 121 if (flags & BTRFS_INODE_NODATACOW)
122 iflags |= FS_NOCOW_FL;
123
124 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
125 iflags |= FS_COMPR_FL;
126 else if (flags & BTRFS_INODE_NOCOMPRESS)
127 iflags |= FS_NOCOMP_FL;
6cbff00f
CH		 128
129 return iflags;
130}
131
132/*
133 * Update inode->i_flags based on the btrfs internal flags.
134 */
135void btrfs_update_iflags(struct inode *inode)
136{
137 struct btrfs_inode *ip = BTRFS_I(inode);
138
139 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
140
141 if (ip->flags & BTRFS_INODE_SYNC)
142 inode->i_flags |= S_SYNC;
143 if (ip->flags & BTRFS_INODE_IMMUTABLE)
144 inode->i_flags |= S_IMMUTABLE;
145 if (ip->flags & BTRFS_INODE_APPEND)
146 inode->i_flags |= S_APPEND;
147 if (ip->flags & BTRFS_INODE_NOATIME)
148 inode->i_flags |= S_NOATIME;
149 if (ip->flags & BTRFS_INODE_DIRSYNC)
150 inode->i_flags |= S_DIRSYNC;
151}
152
153/*
154 * Inherit flags from the parent inode.
155 *
e27425d6 156 * Currently only the compression flags and the cow flags are inherited.
6cbff00f
CH		 157 */
158void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
159{
0b4dcea5
CM		 160 unsigned int flags;
161
162 if (!dir)
163 return;
164
165 flags = BTRFS_I(dir)->flags;
6cbff00f 166
e27425d6
JB		 167 if (flags & BTRFS_INODE_NOCOMPRESS) {
168 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
169 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
170 } else if (flags & BTRFS_INODE_COMPRESS) {
171 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
172 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
173 }
174
213490b3 175 if (flags & BTRFS_INODE_NODATACOW) {
e27425d6 176 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
213490b3
LB		 177 if (S_ISREG(inode->i_mode))
178 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
179 }
6cbff00f 180
6cbff00f
CH		 181 btrfs_update_iflags(inode);
182}
183
184static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
185{
496ad9aa 186 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
6cbff00f
CH		 187 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
188
189 if (copy_to_user(arg, &flags, sizeof(flags)))
190 return -EFAULT;
191 return 0;
192}
193
75e7cb7f
LB		 194static int check_flags(unsigned int flags)
195{
196 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
197 FS_NOATIME_FL | FS_NODUMP_FL | \
198 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 199 FS_NOCOMP_FL | FS_COMPR_FL |
200 FS_NOCOW_FL))
75e7cb7f
LB		 201 return -EOPNOTSUPP;
202
203 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
204 return -EINVAL;
205
75e7cb7f
LB		 206 return 0;
207}
208
6cbff00f
CH		 209static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
210{
496ad9aa 211 struct inode *inode = file_inode(file);
6cbff00f
CH		 212 struct btrfs_inode *ip = BTRFS_I(inode);
213 struct btrfs_root *root = ip->root;
214 struct btrfs_trans_handle *trans;
215 unsigned int flags, oldflags;
216 int ret;
f062abf0
LZ		 217 u64 ip_oldflags;
218 unsigned int i_oldflags;
7e97b8da 219 umode_t mode;
6cbff00f 220
bd60ea0f
DS		 221 if (!inode_owner_or_capable(inode))
222 return -EPERM;
223
b83cc969
LZ		 224 if (btrfs_root_readonly(root))
225 return -EROFS;
226
6cbff00f
CH		 227 if (copy_from_user(&flags, arg, sizeof(flags)))
228 return -EFAULT;
229
75e7cb7f
LB		 230 ret = check_flags(flags);
231 if (ret)
232 return ret;
f46b5a66 233
e7848683
JK		 234 ret = mnt_want_write_file(file);
235 if (ret)
236 return ret;
237
6cbff00f
CH		 238 mutex_lock(&inode->i_mutex);
239
f062abf0
LZ		 240 ip_oldflags = ip->flags;
241 i_oldflags = inode->i_flags;
7e97b8da 242 mode = inode->i_mode;
f062abf0 243
6cbff00f
CH		 244 flags = btrfs_mask_flags(inode->i_mode, flags);
245 oldflags = btrfs_flags_to_ioctl(ip->flags);
246 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
247 if (!capable(CAP_LINUX_IMMUTABLE)) {
248 ret = -EPERM;
249 goto out_unlock;
250 }
251 }
252
6cbff00f
CH		 253 if (flags & FS_SYNC_FL)
254 ip->flags |= BTRFS_INODE_SYNC;
255 else
256 ip->flags &= ~BTRFS_INODE_SYNC;
257 if (flags & FS_IMMUTABLE_FL)
258 ip->flags |= BTRFS_INODE_IMMUTABLE;
259 else
260 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
261 if (flags & FS_APPEND_FL)
262 ip->flags |= BTRFS_INODE_APPEND;
263 else
264 ip->flags &= ~BTRFS_INODE_APPEND;
265 if (flags & FS_NODUMP_FL)
266 ip->flags |= BTRFS_INODE_NODUMP;
267 else
268 ip->flags &= ~BTRFS_INODE_NODUMP;
269 if (flags & FS_NOATIME_FL)
270 ip->flags |= BTRFS_INODE_NOATIME;
271 else
272 ip->flags &= ~BTRFS_INODE_NOATIME;
273 if (flags & FS_DIRSYNC_FL)
274 ip->flags |= BTRFS_INODE_DIRSYNC;
275 else
276 ip->flags &= ~BTRFS_INODE_DIRSYNC;
7e97b8da
DS		 277 if (flags & FS_NOCOW_FL) {
278 if (S_ISREG(mode)) {
279 /*
280 * It's safe to turn csums off here, no extents exist.
281 * Otherwise we want the flag to reflect the real COW
282 * status of the file and will not set it.
283 */
284 if (inode->i_size == 0)
285 ip->flags |= BTRFS_INODE_NODATACOW
286 | BTRFS_INODE_NODATASUM;
287 } else {
288 ip->flags |= BTRFS_INODE_NODATACOW;
289 }
290 } else {
291 /*
292 * Revert back under same assuptions as above
293 */
294 if (S_ISREG(mode)) {
295 if (inode->i_size == 0)
296 ip->flags &= ~(BTRFS_INODE_NODATACOW
297 | BTRFS_INODE_NODATASUM);
298 } else {
299 ip->flags &= ~BTRFS_INODE_NODATACOW;
300 }
301 }
6cbff00f 302
75e7cb7f
LB		 303 /*
304 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
305 * flag may be changed automatically if compression code won't make
306 * things smaller.
307 */
308 if (flags & FS_NOCOMP_FL) {
309 ip->flags &= ~BTRFS_INODE_COMPRESS;
310 ip->flags |= BTRFS_INODE_NOCOMPRESS;
63541927
FDBM		 311
312 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
313 if (ret && ret != -ENODATA)
314 goto out_drop;
75e7cb7f 315 } else if (flags & FS_COMPR_FL) {
63541927
FDBM		 316 const char *comp;
317
75e7cb7f
LB		 318 ip->flags |= BTRFS_INODE_COMPRESS;
319 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
63541927
FDBM		 320
321 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
322 comp = "lzo";
323 else
324 comp = "zlib";
325 ret = btrfs_set_prop(inode, "btrfs.compression",
326 comp, strlen(comp), 0);
327 if (ret)
328 goto out_drop;
329
ebcb904d
LZ		 330 } else {
331 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 332 }
6cbff00f 333
4da6f1a3 334 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 335 if (IS_ERR(trans)) {
336 ret = PTR_ERR(trans);
337 goto out_drop;
338 }
6cbff00f 339
306424cc 340 btrfs_update_iflags(inode);
0c4d2d95 341 inode_inc_iversion(inode);
306424cc 342 inode->i_ctime = CURRENT_TIME;
6cbff00f 343 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 344
6cbff00f 345 btrfs_end_transaction(trans, root);
f062abf0
LZ		 346 out_drop:
347 if (ret) {
348 ip->flags = ip_oldflags;
349 inode->i_flags = i_oldflags;
350 }
6cbff00f 351
6cbff00f
CH		 352 out_unlock:
353 mutex_unlock(&inode->i_mutex);
e7848683 354 mnt_drop_write_file(file);
2d4e6f6a 355 return ret;
6cbff00f
CH		 356}
357
358static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
359{
496ad9aa 360 struct inode *inode = file_inode(file);
6cbff00f
CH		 361
362 return put_user(inode->i_generation, arg);
363}
f46b5a66 364
f7039b1d
LD		 365static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
366{
54563d41 367 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
f7039b1d
LD		 368 struct btrfs_device *device;
369 struct request_queue *q;
370 struct fstrim_range range;
371 u64 minlen = ULLONG_MAX;
372 u64 num_devices = 0;
815745cf 373 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
f7039b1d
LD		 374 int ret;
375
376 if (!capable(CAP_SYS_ADMIN))
377 return -EPERM;
378
1f78160c
XG		 379 rcu_read_lock();
380 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
381 dev_list) {
f7039b1d
LD		 382 if (!device->bdev)
383 continue;
384 q = bdev_get_queue(device->bdev);
385 if (blk_queue_discard(q)) {
386 num_devices++;
387 minlen = min((u64)q->limits.discard_granularity,
388 minlen);
389 }
390 }
1f78160c 391 rcu_read_unlock();
f4c697e6 392
f7039b1d
LD		 393 if (!num_devices)
394 return -EOPNOTSUPP;
f7039b1d
LD		 395 if (copy_from_user(&range, arg, sizeof(range)))
396 return -EFAULT;
e515c18b
LC		 397 if (range.start > total_bytes ||
398 range.len < fs_info->sb->s_blocksize)
f4c697e6 399 return -EINVAL;
f7039b1d 400
f4c697e6 401 range.len = min(range.len, total_bytes - range.start);
f7039b1d 402 range.minlen = max(range.minlen, minlen);
815745cf 403 ret = btrfs_trim_fs(fs_info->tree_root, &range);
f7039b1d
LD		 404 if (ret < 0)
405 return ret;
406
407 if (copy_to_user(arg, &range, sizeof(range)))
408 return -EFAULT;
409
410 return 0;
411}
412
dd5f9615
SB		 413int btrfs_is_empty_uuid(u8 *uuid)
414{
46e0f66a
CM		 415 int i;
416
417 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
418 if (uuid[i])
419 return 0;
420 }
421 return 1;
dd5f9615
SB		 422}
423
d5c12070 424static noinline int create_subvol(struct inode *dir,
cb8e7090 425 struct dentry *dentry,
72fd032e 426 char *name, int namelen,
6f72c7e2 427 u64 *async_transid,
8696c533 428 struct btrfs_qgroup_inherit *inherit)
f46b5a66
CH		 429{
430 struct btrfs_trans_handle *trans;
431 struct btrfs_key key;
432 struct btrfs_root_item root_item;
433 struct btrfs_inode_item *inode_item;
434 struct extent_buffer *leaf;
d5c12070 435 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 436 struct btrfs_root *new_root;
d5c12070 437 struct btrfs_block_rsv block_rsv;
8ea05e3a 438 struct timespec cur_time = CURRENT_TIME;
5662344b 439 struct inode *inode;
f46b5a66
CH		 440 int ret;
441 int err;
442 u64 objectid;
443 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 444 u64 index = 0;
d5c12070 445 u64 qgroup_reserved;
8ea05e3a 446 uuid_le new_uuid;
f46b5a66 447
581bb050 448 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
2fbe8c8a 449 if (ret)
a22285a6 450 return ret;
6a912213 451
d5c12070 452 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 453 /*
d5c12070
MX		 454 * The same as the snapshot creation, please see the comment
455 * of create_snapshot().
9ed74f2d 456 */
d5c12070 457 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
dd5f9615 458 8, &qgroup_reserved, false);
d5c12070
MX		 459 if (ret)
460 return ret;
461
462 trans = btrfs_start_transaction(root, 0);
463 if (IS_ERR(trans)) {
464 ret = PTR_ERR(trans);
de6e8200
LB		 465 btrfs_subvolume_release_metadata(root, &block_rsv,
466 qgroup_reserved);
467 return ret;
d5c12070
MX		 468 }
469 trans->block_rsv = &block_rsv;
470 trans->bytes_reserved = block_rsv.size;
f46b5a66 471
8696c533 472 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
6f72c7e2
AJ		 473 if (ret)
474 goto fail;
475
5d4f98a2 476 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
5581a51a 477 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 478 if (IS_ERR(leaf)) {
479 ret = PTR_ERR(leaf);
480 goto fail;
481 }
f46b5a66 482
5d4f98a2 483 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
f46b5a66
CH		 484 btrfs_set_header_bytenr(leaf, leaf->start);
485 btrfs_set_header_generation(leaf, trans->transid);
5d4f98a2 486 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
f46b5a66
CH		 487 btrfs_set_header_owner(leaf, objectid);
488
0a4e5586 489 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
f46b5a66 490 BTRFS_FSID_SIZE);
5d4f98a2 491 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
b308bc2f 492 btrfs_header_chunk_tree_uuid(leaf),
5d4f98a2 493 BTRFS_UUID_SIZE);
f46b5a66
CH		 494 btrfs_mark_buffer_dirty(leaf);
495
8ea05e3a
AB		 496 memset(&root_item, 0, sizeof(root_item));
497
f46b5a66 498 inode_item = &root_item.inode;
3cae210f
QW		 499 btrfs_set_stack_inode_generation(inode_item, 1);
500 btrfs_set_stack_inode_size(inode_item, 3);
501 btrfs_set_stack_inode_nlink(inode_item, 1);
502 btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
503 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
f46b5a66 504
3cae210f
QW		 505 btrfs_set_root_flags(&root_item, 0);
506 btrfs_set_root_limit(&root_item, 0);
507 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
08fe4db1 508
f46b5a66 509 btrfs_set_root_bytenr(&root_item, leaf->start);
84234f3a 510 btrfs_set_root_generation(&root_item, trans->transid);
f46b5a66
CH		 511 btrfs_set_root_level(&root_item, 0);
512 btrfs_set_root_refs(&root_item, 1);
86b9f2ec 513 btrfs_set_root_used(&root_item, leaf->len);
80ff3856 514 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66 515
8ea05e3a
AB		 516 btrfs_set_root_generation_v2(&root_item,
517 btrfs_root_generation(&root_item));
518 uuid_le_gen(&new_uuid);
519 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
3cae210f
QW		 520 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
521 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
8ea05e3a
AB		 522 root_item.ctime = root_item.otime;
523 btrfs_set_root_ctransid(&root_item, trans->transid);
524 btrfs_set_root_otransid(&root_item, trans->transid);
f46b5a66 525
925baedd 526 btrfs_tree_unlock(leaf);
f46b5a66
CH		 527 free_extent_buffer(leaf);
528 leaf = NULL;
529
530 btrfs_set_root_dirid(&root_item, new_dirid);
531
532 key.objectid = objectid;
5d4f98a2 533 key.offset = 0;
f46b5a66
CH		 534 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
535 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
536 &root_item);
537 if (ret)
538 goto fail;
539
76dda93c
YZ		 540 key.offset = (u64)-1;
541 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
79787eaa
JM		 542 if (IS_ERR(new_root)) {
543 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
544 ret = PTR_ERR(new_root);
545 goto fail;
546 }
76dda93c
YZ		 547
548 btrfs_record_root_in_trans(trans, new_root);
549
63541927 550 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
ce598979
MF		 551 if (ret) {
552 /* We potentially lose an unused inode item here */
79787eaa 553 btrfs_abort_transaction(trans, root, ret);
ce598979
MF		 554 goto fail;
555 }
556
f46b5a66
CH		 557 /*
558 * insert the directory item
559 */
3de4586c 560 ret = btrfs_set_inode_index(dir, &index);
79787eaa
JM		 561 if (ret) {
562 btrfs_abort_transaction(trans, root, ret);
563 goto fail;
564 }
3de4586c
CM		 565
566 ret = btrfs_insert_dir_item(trans, root,
16cdcec7 567 name, namelen, dir, &key,
3de4586c 568 BTRFS_FT_DIR, index);
79787eaa
JM		 569 if (ret) {
570 btrfs_abort_transaction(trans, root, ret);
f46b5a66 571 goto fail;
79787eaa 572 }
0660b5af 573
52c26179
YZ		 574 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
575 ret = btrfs_update_inode(trans, root, dir);
576 BUG_ON(ret);
577
0660b5af 578 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4df27c4d 579 objectid, root->root_key.objectid,
33345d01 580 btrfs_ino(dir), index, name, namelen);
76dda93c 581 BUG_ON(ret);
f46b5a66 582
dd5f9615
SB		 583 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
584 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
585 objectid);
586 if (ret)
587 btrfs_abort_transaction(trans, root, ret);
588
f46b5a66 589fail:
d5c12070
MX		 590 trans->block_rsv = NULL;
591 trans->bytes_reserved = 0;
de6e8200
LB		 592 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
593
72fd032e
SW		 594 if (async_transid) {
595 *async_transid = trans->transid;
596 err = btrfs_commit_transaction_async(trans, root, 1);
00d71c9c
MX		 597 if (err)
598 err = btrfs_commit_transaction(trans, root);
72fd032e
SW		 599 } else {
600 err = btrfs_commit_transaction(trans, root);
601 }
f46b5a66
CH		 602 if (err && !ret)
603 ret = err;
1a65e24b 604
5662344b
TI		 605 if (!ret) {
606 inode = btrfs_lookup_dentry(dir, dentry);
de6e8200
LB		 607 if (IS_ERR(inode))
608 return PTR_ERR(inode);
5662344b
TI		 609 d_instantiate(dentry, inode);
610 }
f46b5a66
CH		 611 return ret;
612}
613
8257b2dc
MX		 614static void btrfs_wait_nocow_write(struct btrfs_root *root)
615{
616 s64 writers;
617 DEFINE_WAIT(wait);
618
619 do {
620 prepare_to_wait(&root->subv_writers->wait, &wait,
621 TASK_UNINTERRUPTIBLE);
622
623 writers = percpu_counter_sum(&root->subv_writers->counter);
624 if (writers)
625 schedule();
626
627 finish_wait(&root->subv_writers->wait, &wait);
628 } while (writers);
629}
630
e9662f70
MX		 631static int create_snapshot(struct btrfs_root *root, struct inode *dir,
632 struct dentry *dentry, char *name, int namelen,
633 u64 *async_transid, bool readonly,
634 struct btrfs_qgroup_inherit *inherit)
f46b5a66 635{
2e4bfab9 636 struct inode *inode;
f46b5a66
CH		 637 struct btrfs_pending_snapshot *pending_snapshot;
638 struct btrfs_trans_handle *trans;
2e4bfab9 639 int ret;
f46b5a66
CH		 640
641 if (!root->ref_cows)
642 return -EINVAL;
643
8257b2dc
MX		 644 atomic_inc(&root->will_be_snapshoted);
645 smp_mb__after_atomic_inc();
646 btrfs_wait_nocow_write(root);
647
6a03843d
MX		 648 ret = btrfs_start_delalloc_inodes(root, 0);
649 if (ret)
8257b2dc 650 goto out;
6a03843d 651
b0244199 652 btrfs_wait_ordered_extents(root, -1);
6a03843d 653
3de4586c 654 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
8257b2dc
MX		 655 if (!pending_snapshot) {
656 ret = -ENOMEM;
657 goto out;
658 }
a22285a6 659
66d8f3dd
MX		 660 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
661 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 662 /*
663 * 1 - parent dir inode
664 * 2 - dir entries
665 * 1 - root item
666 * 2 - root ref/backref
667 * 1 - root of snapshot
dd5f9615 668 * 1 - UUID item
d5c12070
MX		 669 */
670 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
dd5f9615 671 &pending_snapshot->block_rsv, 8,
ee3441b4
JM		 672 &pending_snapshot->qgroup_reserved,
673 false);
d5c12070 674 if (ret)
8257b2dc 675 goto free;
d5c12070 676
3de4586c 677 pending_snapshot->dentry = dentry;
f46b5a66 678 pending_snapshot->root = root;
b83cc969 679 pending_snapshot->readonly = readonly;
e9662f70 680 pending_snapshot->dir = dir;
8696c533 681 pending_snapshot->inherit = inherit;
a22285a6 682
d5c12070 683 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 684 if (IS_ERR(trans)) {
685 ret = PTR_ERR(trans);
686 goto fail;
687 }
688
8351583e 689 spin_lock(&root->fs_info->trans_lock);
f46b5a66
CH		 690 list_add(&pending_snapshot->list,
691 &trans->transaction->pending_snapshots);
8351583e 692 spin_unlock(&root->fs_info->trans_lock);
72fd032e
SW		 693 if (async_transid) {
694 *async_transid = trans->transid;
695 ret = btrfs_commit_transaction_async(trans,
696 root->fs_info->extent_root, 1);
00d71c9c
MX		 697 if (ret)
698 ret = btrfs_commit_transaction(trans, root);
72fd032e
SW		 699 } else {
700 ret = btrfs_commit_transaction(trans,
701 root->fs_info->extent_root);
702 }
aec8030a 703 if (ret)
c37b2b62 704 goto fail;
a22285a6
YZ		 705
706 ret = pending_snapshot->error;
707 if (ret)
708 goto fail;
709
66b4ffd1
JB		 710 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
711 if (ret)
712 goto fail;
f46b5a66 713
2fbe8c8a 714 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 715 if (IS_ERR(inode)) {
716 ret = PTR_ERR(inode);
717 goto fail;
718 }
5662344b 719
2e4bfab9
YZ		 720 d_instantiate(dentry, inode);
721 ret = 0;
722fail:
d5c12070
MX		 723 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
724 &pending_snapshot->block_rsv,
725 pending_snapshot->qgroup_reserved);
8257b2dc 726free:
a22285a6 727 kfree(pending_snapshot);
8257b2dc
MX		 728out:
729 atomic_dec(&root->will_be_snapshoted);
f46b5a66
CH		 730 return ret;
731}
732
4260f7c7
SW		 733/* copy of check_sticky in fs/namei.c()
734* It's inline, so penalty for filesystems that don't use sticky bit is
735* minimal.
736*/
737static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
738{
2f2f43d3 739 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 740
741 if (!(dir->i_mode & S_ISVTX))
742 return 0;
2f2f43d3 743 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 744 return 0;
2f2f43d3 745 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 746 return 0;
747 return !capable(CAP_FOWNER);
748}
749
750/* copy of may_delete in fs/namei.c()
751 * Check whether we can remove a link victim from directory dir, check
752 * whether the type of victim is right.
753 * 1. We can't do it if dir is read-only (done in permission())
754 * 2. We should have write and exec permissions on dir
755 * 3. We can't remove anything from append-only dir
756 * 4. We can't do anything with immutable dir (done in permission())
757 * 5. If the sticky bit on dir is set we should either
758 * a. be owner of dir, or
759 * b. be owner of victim, or
760 * c. have CAP_FOWNER capability
761 * 6. If the victim is append-only or immutable we can't do antyhing with
762 * links pointing to it.
763 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
764 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
765 * 9. We can't remove a root or mountpoint.
766 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
767 * nfs_async_unlink().
768 */
769
67871254 770static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
4260f7c7
SW		 771{
772 int error;
773
774 if (!victim->d_inode)
775 return -ENOENT;
776
777 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 778 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 779
780 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
781 if (error)
782 return error;
783 if (IS_APPEND(dir))
784 return -EPERM;
785 if (btrfs_check_sticky(dir, victim->d_inode)||
786 IS_APPEND(victim->d_inode)||
787 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
788 return -EPERM;
789 if (isdir) {
790 if (!S_ISDIR(victim->d_inode->i_mode))
791 return -ENOTDIR;
792 if (IS_ROOT(victim))
793 return -EBUSY;
794 } else if (S_ISDIR(victim->d_inode->i_mode))
795 return -EISDIR;
796 if (IS_DEADDIR(dir))
797 return -ENOENT;
798 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
799 return -EBUSY;
800 return 0;
801}
802
cb8e7090
CH		 803/* copy of may_create in fs/namei.c() */
804static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
805{
806 if (child->d_inode)
807 return -EEXIST;
808 if (IS_DEADDIR(dir))
809 return -ENOENT;
810 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
811}
812
813/*
814 * Create a new subvolume below @parent. This is largely modeled after
815 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
816 * inside this filesystem so it's quite a bit simpler.
817 */
76dda93c
YZ		 818static noinline int btrfs_mksubvol(struct path *parent,
819 char *name, int namelen,
72fd032e 820 struct btrfs_root *snap_src,
6f72c7e2 821 u64 *async_transid, bool readonly,
8696c533 822 struct btrfs_qgroup_inherit *inherit)
cb8e7090 823{
76dda93c 824 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 825 struct dentry *dentry;
826 int error;
827
5c50c9b8
DS		 828 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
829 if (error == -EINTR)
830 return error;
cb8e7090
CH		 831
832 dentry = lookup_one_len(name, parent->dentry, namelen);
833 error = PTR_ERR(dentry);
834 if (IS_ERR(dentry))
835 goto out_unlock;
836
837 error = -EEXIST;
838 if (dentry->d_inode)
839 goto out_dput;
840
76dda93c 841 error = btrfs_may_create(dir, dentry);
cb8e7090 842 if (error)
a874a63e 843 goto out_dput;
cb8e7090 844
9c52057c
CM		 845 /*
846 * even if this name doesn't exist, we may get hash collisions.
847 * check for them now when we can safely fail
848 */
849 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
850 dir->i_ino, name,
851 namelen);
852 if (error)
853 goto out_dput;
854
76dda93c
YZ		 855 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
856
857 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
858 goto out_up_read;
859
3de4586c 860 if (snap_src) {
e9662f70 861 error = create_snapshot(snap_src, dir, dentry, name, namelen,
6f72c7e2 862 async_transid, readonly, inherit);
3de4586c 863 } else {
d5c12070
MX		 864 error = create_subvol(dir, dentry, name, namelen,
865 async_transid, inherit);
3de4586c 866 }
76dda93c
YZ		 867 if (!error)
868 fsnotify_mkdir(dir, dentry);
869out_up_read:
870 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 871out_dput:
872 dput(dentry);
873out_unlock:
76dda93c 874 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 875 return error;
876}
877
4cb5300b
CM		 878/*
879 * When we're defragging a range, we don't want to kick it off again
880 * if it is really just waiting for delalloc to send it down.
881 * If we find a nice big extent or delalloc range for the bytes in the
882 * file you want to defrag, we return 0 to let you know to skip this
883 * part of the file
884 */
885static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
886{
887 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
888 struct extent_map *em = NULL;
889 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
890 u64 end;
891
892 read_lock(&em_tree->lock);
893 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
894 read_unlock(&em_tree->lock);
895
896 if (em) {
897 end = extent_map_end(em);
898 free_extent_map(em);
899 if (end - offset > thresh)
900 return 0;
901 }
902 /* if we already have a nice delalloc here, just stop */
903 thresh /= 2;
904 end = count_range_bits(io_tree, &offset, offset + thresh,
905 thresh, EXTENT_DELALLOC, 1);
906 if (end >= thresh)
907 return 0;
908 return 1;
909}
910
911/*
912 * helper function to walk through a file and find extents
913 * newer than a specific transid, and smaller than thresh.
914 *
915 * This is used by the defragging code to find new and small
916 * extents
917 */
918static int find_new_extents(struct btrfs_root *root,
919 struct inode *inode, u64 newer_than,
920 u64 *off, int thresh)
921{
922 struct btrfs_path *path;
923 struct btrfs_key min_key;
4cb5300b
CM		 924 struct extent_buffer *leaf;
925 struct btrfs_file_extent_item *extent;
926 int type;
927 int ret;
a4689d2b 928 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 929
930 path = btrfs_alloc_path();
931 if (!path)
932 return -ENOMEM;
933
a4689d2b 934 min_key.objectid = ino;
4cb5300b
CM		 935 min_key.type = BTRFS_EXTENT_DATA_KEY;
936 min_key.offset = *off;
937
67871254 938 while (1) {
f094c9bd 939 path->keep_locks = 1;
6174d3cb 940 ret = btrfs_search_forward(root, &min_key, path, newer_than);
4cb5300b
CM		 941 if (ret != 0)
942 goto none;
f094c9bd
FM		 943 path->keep_locks = 0;
944 btrfs_unlock_up_safe(path, 1);
945process_slot:
a4689d2b 946 if (min_key.objectid != ino)
4cb5300b
CM		 947 goto none;
948 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
949 goto none;
950
951 leaf = path->nodes[0];
952 extent = btrfs_item_ptr(leaf, path->slots[0],
953 struct btrfs_file_extent_item);
954
955 type = btrfs_file_extent_type(leaf, extent);
956 if (type == BTRFS_FILE_EXTENT_REG &&
957 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
958 check_defrag_in_cache(inode, min_key.offset, thresh)) {
959 *off = min_key.offset;
960 btrfs_free_path(path);
961 return 0;
962 }
963
f094c9bd
FM		 964 path->slots[0]++;
965 if (path->slots[0] < btrfs_header_nritems(leaf)) {
966 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
967 goto process_slot;
968 }
969
4cb5300b
CM		 970 if (min_key.offset == (u64)-1)
971 goto none;
972
973 min_key.offset++;
974 btrfs_release_path(path);
975 }
976none:
977 btrfs_free_path(path);
978 return -ENOENT;
979}
980
6c282eb4 981static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 982{
983 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 984 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
985 struct extent_map *em;
986 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 987
6c282eb4
LZ		 988 /*
989 * hopefully we have this extent in the tree already, try without
990 * the full extent lock
991 */
17ce6ef8 992 read_lock(&em_tree->lock);
6c282eb4 993 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 994 read_unlock(&em_tree->lock);
995
6c282eb4 996 if (!em) {
308d9800
FM		 997 struct extent_state *cached = NULL;
998 u64 end = start + len - 1;
999
6c282eb4 1000 /* get the big lock and read metadata off disk */
308d9800 1001 lock_extent_bits(io_tree, start, end, 0, &cached);
6c282eb4 1002 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
308d9800 1003 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
6c282eb4
LZ		 1004
1005 if (IS_ERR(em))
1006 return NULL;
1007 }
1008
1009 return em;
1010}
17ce6ef8 1011
6c282eb4
LZ		 1012static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1013{
1014 struct extent_map *next;
1015 bool ret = true;
1016
1017 /* this is the last extent */
1018 if (em->start + em->len >= i_size_read(inode))
1019 return false;
1020
1021 next = defrag_lookup_extent(inode, em->start + em->len);
e2127cf0
FM		 1022 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE ||
1023 (em->block_start + em->block_len == next->block_start))
6c282eb4
LZ		 1024 ret = false;
1025
1026 free_extent_map(next);
17ce6ef8
LB		 1027 return ret;
1028}
1029
6c282eb4 1030static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 1031 u64 *last_len, u64 *skip, u64 *defrag_end,
1032 int compress)
940100a4 1033{
6c282eb4 1034 struct extent_map *em;
940100a4 1035 int ret = 1;
6c282eb4 1036 bool next_mergeable = true;
940100a4
CM		 1037
1038 /*
008873ea 1039 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 1040 * defragging it
1041 */
1042 if (start < *defrag_end)
1043 return 1;
1044
1045 *skip = 0;
1046
6c282eb4
LZ		 1047 em = defrag_lookup_extent(inode, start);
1048 if (!em)
1049 return 0;
940100a4
CM		 1050
1051 /* this will cover holes, and inline extents */
17ce6ef8 1052 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 1053 ret = 0;
17ce6ef8
LB		 1054 goto out;
1055 }
1056
6c282eb4 1057 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 1058
1059 /*
6c282eb4
LZ		 1060 * we hit a real extent, if it is big or the next extent is not a
1061 * real extent, don't bother defragging it
940100a4 1062 */
a43a2111 1063 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 1064 (em->len >= thresh || !next_mergeable))
940100a4 1065 ret = 0;
17ce6ef8 1066out:
940100a4
CM		 1067 /*
1068 * last_len ends up being a counter of how many bytes we've defragged.
1069 * every time we choose not to defrag an extent, we reset *last_len
1070 * so that the next tiny extent will force a defrag.
1071 *
1072 * The end result of this is that tiny extents before a single big
1073 * extent will force at least part of that big extent to be defragged.
1074 */
1075 if (ret) {
940100a4
CM		 1076 *defrag_end = extent_map_end(em);
1077 } else {
1078 *last_len = 0;
1079 *skip = extent_map_end(em);
1080 *defrag_end = 0;
1081 }
1082
1083 free_extent_map(em);
1084 return ret;
1085}
1086
4cb5300b
CM		 1087/*
1088 * it doesn't do much good to defrag one or two pages
1089 * at a time. This pulls in a nice chunk of pages
1090 * to COW and defrag.
1091 *
1092 * It also makes sure the delalloc code has enough
1093 * dirty data to avoid making new small extents as part
1094 * of the defrag
1095 *
1096 * It's a good idea to start RA on this range
1097 * before calling this.
1098 */
1099static int cluster_pages_for_defrag(struct inode *inode,
1100 struct page **pages,
1101 unsigned long start_index,
c41570c9 1102 unsigned long num_pages)
f46b5a66 1103{
4cb5300b
CM		 1104 unsigned long file_end;
1105 u64 isize = i_size_read(inode);
1106 u64 page_start;
1107 u64 page_end;
1f12bd06 1108 u64 page_cnt;
4cb5300b
CM		 1109 int ret;
1110 int i;
1111 int i_done;
3eaa2885 1112 struct btrfs_ordered_extent *ordered;
4cb5300b 1113 struct extent_state *cached_state = NULL;
600a45e1 1114 struct extent_io_tree *tree;
3b16a4e3 1115 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1116
4cb5300b 1117 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 1118 if (!isize || start_index > file_end)
1119 return 0;
1120
1121 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 1122
1123 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 1124 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1125 if (ret)
1126 return ret;
4cb5300b 1127 i_done = 0;
600a45e1 1128 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1129
1130 /* step one, lock all the pages */
1f12bd06 1131 for (i = 0; i < page_cnt; i++) {
4cb5300b 1132 struct page *page;
600a45e1 1133again:
a94733d0 1134 page = find_or_create_page(inode->i_mapping,
600a45e1 1135 start_index + i, mask);
4cb5300b
CM		 1136 if (!page)
1137 break;
1138
600a45e1
MX		 1139 page_start = page_offset(page);
1140 page_end = page_start + PAGE_CACHE_SIZE - 1;
1141 while (1) {
308d9800
FM		 1142 lock_extent_bits(tree, page_start, page_end,
1143 0, &cached_state);
600a45e1
MX		 1144 ordered = btrfs_lookup_ordered_extent(inode,
1145 page_start);
308d9800
FM		 1146 unlock_extent_cached(tree, page_start, page_end,
1147 &cached_state, GFP_NOFS);
600a45e1
MX		 1148 if (!ordered)
1149 break;
1150
1151 unlock_page(page);
1152 btrfs_start_ordered_extent(inode, ordered, 1);
1153 btrfs_put_ordered_extent(ordered);
1154 lock_page(page);
1f12bd06
LB		 1155 /*
1156 * we unlocked the page above, so we need check if
1157 * it was released or not.
1158 */
1159 if (page->mapping != inode->i_mapping) {
1160 unlock_page(page);
1161 page_cache_release(page);
1162 goto again;
1163 }
600a45e1
MX		 1164 }
1165
4cb5300b
CM		 1166 if (!PageUptodate(page)) {
1167 btrfs_readpage(NULL, page);
1168 lock_page(page);
1169 if (!PageUptodate(page)) {
1170 unlock_page(page);
1171 page_cache_release(page);
1172 ret = -EIO;
1173 break;
1174 }
1175 }
600a45e1 1176
600a45e1
MX		 1177 if (page->mapping != inode->i_mapping) {
1178 unlock_page(page);
1179 page_cache_release(page);
1180 goto again;
1181 }
1182
4cb5300b
CM		 1183 pages[i] = page;
1184 i_done++;
1185 }
1186 if (!i_done || ret)
1187 goto out;
1188
1189 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1190 goto out;
1191
1192 /*
1193 * so now we have a nice long stream of locked
1194 * and up to date pages, lets wait on them
1195 */
1196 for (i = 0; i < i_done; i++)
1197 wait_on_page_writeback(pages[i]);
1198
1199 page_start = page_offset(pages[0]);
1200 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1201
1202 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1203 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1204 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1205 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1206 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1207 &cached_state, GFP_NOFS);
4cb5300b 1208
1f12bd06 1209 if (i_done != page_cnt) {
9e0baf60
JB		 1210 spin_lock(&BTRFS_I(inode)->lock);
1211 BTRFS_I(inode)->outstanding_extents++;
1212 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1213 btrfs_delalloc_release_space(inode,
1f12bd06 1214 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1215 }
1216
1217
9e8a4a8b
LB		 1218 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1219 &cached_state, GFP_NOFS);
4cb5300b
CM		 1220
1221 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1222 page_start, page_end - 1, &cached_state,
1223 GFP_NOFS);
1224
1225 for (i = 0; i < i_done; i++) {
1226 clear_page_dirty_for_io(pages[i]);
1227 ClearPageChecked(pages[i]);
1228 set_page_extent_mapped(pages[i]);
1229 set_page_dirty(pages[i]);
1230 unlock_page(pages[i]);
1231 page_cache_release(pages[i]);
1232 }
1233 return i_done;
1234out:
1235 for (i = 0; i < i_done; i++) {
1236 unlock_page(pages[i]);
1237 page_cache_release(pages[i]);
1238 }
1f12bd06 1239 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1240 return ret;
1241
1242}
1243
1244int btrfs_defrag_file(struct inode *inode, struct file *file,
1245 struct btrfs_ioctl_defrag_range_args *range,
1246 u64 newer_than, unsigned long max_to_defrag)
1247{
1248 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1249 struct file_ra_state *ra = NULL;
f46b5a66 1250 unsigned long last_index;
151a31b2 1251 u64 isize = i_size_read(inode);
940100a4
CM		 1252 u64 last_len = 0;
1253 u64 skip = 0;
1254 u64 defrag_end = 0;
4cb5300b 1255 u64 newer_off = range->start;
f46b5a66 1256 unsigned long i;
008873ea 1257 unsigned long ra_index = 0;
f46b5a66 1258 int ret;
4cb5300b 1259 int defrag_count = 0;
1a419d85 1260 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1261 int extent_thresh = range->extent_thresh;
c41570c9
JM		 1262 unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1263 unsigned long cluster = max_cluster;
4cb5300b
CM		 1264 u64 new_align = ~((u64)128 * 1024 - 1);
1265 struct page **pages = NULL;
1266
0abd5b17
LB		 1267 if (isize == 0)
1268 return 0;
1269
1270 if (range->start >= isize)
1271 return -EINVAL;
1a419d85
LZ		 1272
1273 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1274 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1275 return -EINVAL;
1276 if (range->compress_type)
1277 compress_type = range->compress_type;
1278 }
f46b5a66 1279
0abd5b17
LB		 1280 if (extent_thresh == 0)
1281 extent_thresh = 256 * 1024;
940100a4 1282
4cb5300b
CM		 1283 /*
1284 * if we were not given a file, allocate a readahead
1285 * context
1286 */
1287 if (!file) {
1288 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1289 if (!ra)
1290 return -ENOMEM;
1291 file_ra_state_init(ra, inode->i_mapping);
1292 } else {
1293 ra = &file->f_ra;
1294 }
1295
d9b0d9ba 1296 pages = kmalloc_array(max_cluster, sizeof(struct page *),
4cb5300b
CM		 1297 GFP_NOFS);
1298 if (!pages) {
1299 ret = -ENOMEM;
1300 goto out_ra;
1301 }
1302
1303 /* find the last page to defrag */
1e701a32 1304 if (range->start + range->len > range->start) {
151a31b2 1305 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1306 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1307 } else {
151a31b2 1308 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1309 }
1310
4cb5300b
CM		 1311 if (newer_than) {
1312 ret = find_new_extents(root, inode, newer_than,
1313 &newer_off, 64 * 1024);
1314 if (!ret) {
1315 range->start = newer_off;
1316 /*
1317 * we always align our defrag to help keep
1318 * the extents in the file evenly spaced
1319 */
1320 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1321 } else
1322 goto out_ra;
1323 } else {
1324 i = range->start >> PAGE_CACHE_SHIFT;
1325 }
1326 if (!max_to_defrag)
7ec31b54 1327 max_to_defrag = last_index + 1;
4cb5300b 1328
2a0f7f57
LZ		 1329 /*
1330 * make writeback starts from i, so the defrag range can be
1331 * written sequentially.
1332 */
1333 if (i < inode->i_mapping->writeback_index)
1334 inode->i_mapping->writeback_index = i;
1335
f7f43cc8
CM		 1336 while (i <= last_index && defrag_count < max_to_defrag &&
1337 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1338 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1339 /*
1340 * make sure we stop running if someone unmounts
1341 * the FS
1342 */
1343 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1344 break;
1345
210549eb 1346 if (btrfs_defrag_cancelled(root->fs_info)) {
efe120a0 1347 printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
210549eb
DS		 1348 ret = -EAGAIN;
1349 break;
1350 }
1351
66c26892 1352 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1353 extent_thresh, &last_len, &skip,
a43a2111
AM		 1354 &defrag_end, range->flags &
1355 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1356 unsigned long next;
1357 /*
1358 * the should_defrag function tells us how much to skip
1359 * bump our counter by the suggested amount
1360 */
1361 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1362 i = max(i + 1, next);
1363 continue;
1364 }
008873ea
LZ		 1365
1366 if (!newer_than) {
1367 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1368 PAGE_CACHE_SHIFT) - i;
1369 cluster = min(cluster, max_cluster);
1370 } else {
1371 cluster = max_cluster;
1372 }
1373
008873ea
LZ		 1374 if (i + cluster > ra_index) {
1375 ra_index = max(i, ra_index);
1376 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1377 cluster);
1378 ra_index += max_cluster;
1379 }
940100a4 1380
ecb8bea8 1381 mutex_lock(&inode->i_mutex);
633085c7
FDBM		 1382 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1383 BTRFS_I(inode)->force_compress = compress_type;
008873ea 1384 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1385 if (ret < 0) {
1386 mutex_unlock(&inode->i_mutex);
4cb5300b 1387 goto out_ra;
ecb8bea8 1388 }
4cb5300b
CM		 1389
1390 defrag_count += ret;
d0e1d66b 1391 balance_dirty_pages_ratelimited(inode->i_mapping);
ecb8bea8 1392 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1393
1394 if (newer_than) {
1395 if (newer_off == (u64)-1)
1396 break;
1397
e1f041e1
LB		 1398 if (ret > 0)
1399 i += ret;
1400
4cb5300b
CM		 1401 newer_off = max(newer_off + 1,
1402 (u64)i << PAGE_CACHE_SHIFT);
1403
1404 ret = find_new_extents(root, inode,
1405 newer_than, &newer_off,
1406 64 * 1024);
1407 if (!ret) {
1408 range->start = newer_off;
1409 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1410 } else {
1411 break;
f46b5a66 1412 }
4cb5300b 1413 } else {
008873ea 1414 if (ret > 0) {
cbcc8326 1415 i += ret;
008873ea
LZ		 1416 last_len += ret << PAGE_CACHE_SHIFT;
1417 } else {
cbcc8326 1418 i++;
008873ea
LZ		 1419 last_len = 0;
1420 }
f46b5a66 1421 }
f46b5a66
CH		 1422 }
1423
dec8ef90 1424 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1e701a32 1425 filemap_flush(inode->i_mapping);
dec8ef90
FM		 1426 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1427 &BTRFS_I(inode)->runtime_flags))
1428 filemap_flush(inode->i_mapping);
1429 }
1e701a32
CM		 1430
1431 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1432 /* the filemap_flush will queue IO into the worker threads, but
1433 * we have to make sure the IO is actually started and that
1434 * ordered extents get created before we return
1435 */
1436 atomic_inc(&root->fs_info->async_submit_draining);
1437 while (atomic_read(&root->fs_info->nr_async_submits) ||
1438 atomic_read(&root->fs_info->async_delalloc_pages)) {
1439 wait_event(root->fs_info->async_submit_wait,
1440 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1441 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1442 }
1443 atomic_dec(&root->fs_info->async_submit_draining);
1e701a32
CM		 1444 }
1445
1a419d85 1446 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1447 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1448 }
1449
60ccf82f 1450 ret = defrag_count;
940100a4 1451
4cb5300b 1452out_ra:
633085c7
FDBM		 1453 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1454 mutex_lock(&inode->i_mutex);
1455 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1456 mutex_unlock(&inode->i_mutex);
1457 }
4cb5300b
CM		 1458 if (!file)
1459 kfree(ra);
1460 kfree(pages);
940100a4 1461 return ret;
f46b5a66
CH		 1462}
1463
198605a8 1464static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1465 void __user *arg)
f46b5a66
CH		 1466{
1467 u64 new_size;
1468 u64 old_size;
1469 u64 devid = 1;
496ad9aa 1470 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 1471 struct btrfs_ioctl_vol_args *vol_args;
1472 struct btrfs_trans_handle *trans;
1473 struct btrfs_device *device = NULL;
1474 char *sizestr;
1475 char *devstr = NULL;
1476 int ret = 0;
f46b5a66
CH		 1477 int mod = 0;
1478
e441d54d
CM		 1479 if (!capable(CAP_SYS_ADMIN))
1480 return -EPERM;
1481
198605a8
MX		 1482 ret = mnt_want_write_file(file);
1483 if (ret)
1484 return ret;
1485
5ac00add
SB		 1486 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1487 1)) {
97547676 1488 mnt_drop_write_file(file);
e57138b3 1489 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1490 }
1491
5ac00add 1492 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 1493 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1494 if (IS_ERR(vol_args)) {
1495 ret = PTR_ERR(vol_args);
1496 goto out;
1497 }
5516e595
MF		 1498
1499 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1500
f46b5a66
CH		 1501 sizestr = vol_args->name;
1502 devstr = strchr(sizestr, ':');
1503 if (devstr) {
1504 char *end;
1505 sizestr = devstr + 1;
1506 *devstr = '\0';
1507 devstr = vol_args->name;
1508 devid = simple_strtoull(devstr, &end, 10);
dfd79829
MX		 1509 if (!devid) {
1510 ret = -EINVAL;
1511 goto out_free;
1512 }
efe120a0 1513 btrfs_info(root->fs_info, "resizing devid %llu", devid);
f46b5a66 1514 }
dba60f3f 1515
aa1b8cd4 1516 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1517 if (!device) {
efe120a0 1518 btrfs_info(root->fs_info, "resizer unable to find device %llu",
c1c9ff7c 1519 devid);
dfd79829 1520 ret = -ENODEV;
c9e9f97b 1521 goto out_free;
f46b5a66 1522 }
dba60f3f
MX		 1523
1524 if (!device->writeable) {
efe120a0
FH		 1525 btrfs_info(root->fs_info,
1526 "resizer unable to apply on readonly device %llu",
c1c9ff7c 1527 devid);
dfd79829 1528 ret = -EPERM;
4e42ae1b
LB		 1529 goto out_free;
1530 }
1531
f46b5a66
CH		 1532 if (!strcmp(sizestr, "max"))
1533 new_size = device->bdev->bd_inode->i_size;
1534 else {
1535 if (sizestr[0] == '-') {
1536 mod = -1;
1537 sizestr++;
1538 } else if (sizestr[0] == '+') {
1539 mod = 1;
1540 sizestr++;
1541 }
91748467 1542 new_size = memparse(sizestr, NULL);
f46b5a66
CH		 1543 if (new_size == 0) {
1544 ret = -EINVAL;
c9e9f97b 1545 goto out_free;
f46b5a66
CH		 1546 }
1547 }
1548
63a212ab 1549 if (device->is_tgtdev_for_dev_replace) {
dfd79829 1550 ret = -EPERM;
63a212ab
SB		 1551 goto out_free;
1552 }
1553
f46b5a66
CH		 1554 old_size = device->total_bytes;
1555
1556 if (mod < 0) {
1557 if (new_size > old_size) {
1558 ret = -EINVAL;
c9e9f97b 1559 goto out_free;
f46b5a66
CH		 1560 }
1561 new_size = old_size - new_size;
1562 } else if (mod > 0) {
eb8052e0
WF		 1563 if (new_size > ULLONG_MAX - old_size) {
1564 ret = -EINVAL;
1565 goto out_free;
1566 }
f46b5a66
CH		 1567 new_size = old_size + new_size;
1568 }
1569
1570 if (new_size < 256 * 1024 * 1024) {
1571 ret = -EINVAL;
c9e9f97b 1572 goto out_free;
f46b5a66
CH		 1573 }
1574 if (new_size > device->bdev->bd_inode->i_size) {
1575 ret = -EFBIG;
c9e9f97b 1576 goto out_free;
f46b5a66
CH		 1577 }
1578
1579 do_div(new_size, root->sectorsize);
1580 new_size *= root->sectorsize;
1581
efe120a0 1582 printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
c1c9ff7c 1583 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1584
1585 if (new_size > old_size) {
a22285a6 1586 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1587 if (IS_ERR(trans)) {
1588 ret = PTR_ERR(trans);
c9e9f97b 1589 goto out_free;
98d5dc13 1590 }
f46b5a66
CH		 1591 ret = btrfs_grow_device(trans, device, new_size);
1592 btrfs_commit_transaction(trans, root);
ece7d20e 1593 } else if (new_size < old_size) {
f46b5a66 1594 ret = btrfs_shrink_device(device, new_size);
0253f40e 1595 } /* equal, nothing need to do */
f46b5a66 1596
c9e9f97b 1597out_free:
f46b5a66 1598 kfree(vol_args);
c9e9f97b
ID		 1599out:
1600 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 1601 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
18f39c41 1602 mnt_drop_write_file(file);
f46b5a66
CH		 1603 return ret;
1604}
1605
72fd032e 1606static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1607 char *name, unsigned long fd, int subvol,
1608 u64 *transid, bool readonly,
8696c533 1609 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1610{
f46b5a66 1611 int namelen;
3de4586c 1612 int ret = 0;
f46b5a66 1613
a874a63e
LB		 1614 ret = mnt_want_write_file(file);
1615 if (ret)
1616 goto out;
1617
72fd032e
SW		 1618 namelen = strlen(name);
1619 if (strchr(name, '/')) {
f46b5a66 1620 ret = -EINVAL;
a874a63e 1621 goto out_drop_write;
f46b5a66
CH		 1622 }
1623
16780cab
CM		 1624 if (name[0] == '.' &&
1625 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1626 ret = -EEXIST;
a874a63e 1627 goto out_drop_write;
16780cab
CM		 1628 }
1629
3de4586c 1630 if (subvol) {
72fd032e 1631 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1632 NULL, transid, readonly, inherit);
cb8e7090 1633 } else {
2903ff01 1634 struct fd src = fdget(fd);
3de4586c 1635 struct inode *src_inode;
2903ff01 1636 if (!src.file) {
3de4586c 1637 ret = -EINVAL;
a874a63e 1638 goto out_drop_write;
3de4586c
CM		 1639 }
1640
496ad9aa
AV		 1641 src_inode = file_inode(src.file);
1642 if (src_inode->i_sb != file_inode(file)->i_sb) {
efe120a0
FH		 1643 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1644 "Snapshot src from another FS");
23ad5b17 1645 ret = -EXDEV;
d0242061
DS		 1646 } else if (!inode_owner_or_capable(src_inode)) {
1647 /*
1648 * Subvolume creation is not restricted, but snapshots
1649 * are limited to own subvolumes only
1650 */
1651 ret = -EPERM;
ecd18815
AV		 1652 } else {
1653 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1654 BTRFS_I(src_inode)->root,
1655 transid, readonly, inherit);
3de4586c 1656 }
2903ff01 1657 fdput(src);
cb8e7090 1658 }
a874a63e
LB		 1659out_drop_write:
1660 mnt_drop_write_file(file);
f46b5a66 1661out:
72fd032e
SW		 1662 return ret;
1663}
1664
1665static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1666 void __user *arg, int subvol)
72fd032e 1667{
fa0d2b9b 1668 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1669 int ret;
1670
fa0d2b9b
LZ		 1671 vol_args = memdup_user(arg, sizeof(*vol_args));
1672 if (IS_ERR(vol_args))
1673 return PTR_ERR(vol_args);
1674 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1675
fa0d2b9b 1676 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1677 vol_args->fd, subvol,
6f72c7e2 1678 NULL, false, NULL);
fdfb1e4f 1679
fa0d2b9b
LZ		 1680 kfree(vol_args);
1681 return ret;
1682}
fdfb1e4f 1683
fa0d2b9b
LZ		 1684static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1685 void __user *arg, int subvol)
1686{
1687 struct btrfs_ioctl_vol_args_v2 *vol_args;
1688 int ret;
1689 u64 transid = 0;
1690 u64 *ptr = NULL;
b83cc969 1691 bool readonly = false;
6f72c7e2 1692 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1693
fa0d2b9b
LZ		 1694 vol_args = memdup_user(arg, sizeof(*vol_args));
1695 if (IS_ERR(vol_args))
1696 return PTR_ERR(vol_args);
1697 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1698
b83cc969 1699 if (vol_args->flags &
6f72c7e2
AJ		 1700 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1701 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1702 ret = -EOPNOTSUPP;
fa0d2b9b 1703 goto out;
72fd032e 1704 }
fa0d2b9b
LZ		 1705
1706 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1707 ptr = &transid;
b83cc969
LZ		 1708 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1709 readonly = true;
6f72c7e2
AJ		 1710 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1711 if (vol_args->size > PAGE_CACHE_SIZE) {
1712 ret = -EINVAL;
1713 goto out;
1714 }
1715 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1716 if (IS_ERR(inherit)) {
1717 ret = PTR_ERR(inherit);
1718 goto out;
1719 }
1720 }
fa0d2b9b
LZ		 1721
1722 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1723 vol_args->fd, subvol, ptr,
8696c533 1724 readonly, inherit);
fa0d2b9b
LZ		 1725
1726 if (ret == 0 && ptr &&
1727 copy_to_user(arg +
1728 offsetof(struct btrfs_ioctl_vol_args_v2,
1729 transid), ptr, sizeof(*ptr)))
1730 ret = -EFAULT;
fdfb1e4f 1731out:
f46b5a66 1732 kfree(vol_args);
6f72c7e2 1733 kfree(inherit);
f46b5a66
CH		 1734 return ret;
1735}
1736
0caa102d
LZ		 1737static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1738 void __user *arg)
1739{
496ad9aa 1740 struct inode *inode = file_inode(file);
0caa102d
LZ		 1741 struct btrfs_root *root = BTRFS_I(inode)->root;
1742 int ret = 0;
1743 u64 flags = 0;
1744
33345d01 1745 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1746 return -EINVAL;
1747
1748 down_read(&root->fs_info->subvol_sem);
1749 if (btrfs_root_readonly(root))
1750 flags |= BTRFS_SUBVOL_RDONLY;
1751 up_read(&root->fs_info->subvol_sem);
1752
1753 if (copy_to_user(arg, &flags, sizeof(flags)))
1754 ret = -EFAULT;
1755
1756 return ret;
1757}
1758
1759static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1760 void __user *arg)
1761{
496ad9aa 1762 struct inode *inode = file_inode(file);
0caa102d
LZ		 1763 struct btrfs_root *root = BTRFS_I(inode)->root;
1764 struct btrfs_trans_handle *trans;
1765 u64 root_flags;
1766 u64 flags;
1767 int ret = 0;
1768
bd60ea0f
DS		 1769 if (!inode_owner_or_capable(inode))
1770 return -EPERM;
1771
b9ca0664
LB		 1772 ret = mnt_want_write_file(file);
1773 if (ret)
1774 goto out;
0caa102d 1775
b9ca0664
LB		 1776 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1777 ret = -EINVAL;
1778 goto out_drop_write;
1779 }
0caa102d 1780
b9ca0664
LB		 1781 if (copy_from_user(&flags, arg, sizeof(flags))) {
1782 ret = -EFAULT;
1783 goto out_drop_write;
1784 }
0caa102d 1785
b9ca0664
LB		 1786 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1787 ret = -EINVAL;
1788 goto out_drop_write;
1789 }
0caa102d 1790
b9ca0664
LB		 1791 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1792 ret = -EOPNOTSUPP;
1793 goto out_drop_write;
1794 }
0caa102d
LZ		 1795
1796 down_write(&root->fs_info->subvol_sem);
1797
1798 /* nothing to do */
1799 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1800 goto out_drop_sem;
0caa102d
LZ		 1801
1802 root_flags = btrfs_root_flags(&root->root_item);
2c686537 1803 if (flags & BTRFS_SUBVOL_RDONLY) {
0caa102d
LZ		 1804 btrfs_set_root_flags(&root->root_item,
1805 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1806 } else {
1807 /*
1808 * Block RO -> RW transition if this subvolume is involved in
1809 * send
1810 */
1811 spin_lock(&root->root_item_lock);
1812 if (root->send_in_progress == 0) {
1813 btrfs_set_root_flags(&root->root_item,
0caa102d 1814 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1815 spin_unlock(&root->root_item_lock);
1816 } else {
1817 spin_unlock(&root->root_item_lock);
1818 btrfs_warn(root->fs_info,
1819 "Attempt to set subvolume %llu read-write during send",
1820 root->root_key.objectid);
1821 ret = -EPERM;
1822 goto out_drop_sem;
1823 }
1824 }
0caa102d
LZ		 1825
1826 trans = btrfs_start_transaction(root, 1);
1827 if (IS_ERR(trans)) {
1828 ret = PTR_ERR(trans);
1829 goto out_reset;
1830 }
1831
b4dc2b8c 1832 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1833 &root->root_key, &root->root_item);
1834
1835 btrfs_commit_transaction(trans, root);
1836out_reset:
1837 if (ret)
1838 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1839out_drop_sem:
0caa102d 1840 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1841out_drop_write:
1842 mnt_drop_write_file(file);
1843out:
0caa102d
LZ		 1844 return ret;
1845}
1846
76dda93c
YZ		 1847/*
1848 * helper to check if the subvolume references other subvolumes
1849 */
1850static noinline int may_destroy_subvol(struct btrfs_root *root)
1851{
1852 struct btrfs_path *path;
175a2b87 1853 struct btrfs_dir_item *di;
76dda93c 1854 struct btrfs_key key;
175a2b87 1855 u64 dir_id;
76dda93c
YZ		 1856 int ret;
1857
1858 path = btrfs_alloc_path();
1859 if (!path)
1860 return -ENOMEM;
1861
175a2b87
JB		 1862 /* Make sure this root isn't set as the default subvol */
1863 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1864 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1865 dir_id, "default", 7, 0);
1866 if (di && !IS_ERR(di)) {
1867 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1868 if (key.objectid == root->root_key.objectid) {
72de6b53
GS		 1869 ret = -EPERM;
1870 btrfs_err(root->fs_info, "deleting default subvolume "
1871 "%llu is not allowed", key.objectid);
175a2b87
JB		 1872 goto out;
1873 }
1874 btrfs_release_path(path);
1875 }
1876
76dda93c
YZ		 1877 key.objectid = root->root_key.objectid;
1878 key.type = BTRFS_ROOT_REF_KEY;
1879 key.offset = (u64)-1;
1880
1881 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1882 &key, path, 0, 0);
1883 if (ret < 0)
1884 goto out;
1885 BUG_ON(ret == 0);
1886
1887 ret = 0;
1888 if (path->slots[0] > 0) {
1889 path->slots[0]--;
1890 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1891 if (key.objectid == root->root_key.objectid &&
1892 key.type == BTRFS_ROOT_REF_KEY)
1893 ret = -ENOTEMPTY;
1894 }
1895out:
1896 btrfs_free_path(path);
1897 return ret;
1898}
1899
ac8e9819
CM		 1900static noinline int key_in_sk(struct btrfs_key *key,
1901 struct btrfs_ioctl_search_key *sk)
1902{
abc6e134
CM		 1903 struct btrfs_key test;
1904 int ret;
1905
1906 test.objectid = sk->min_objectid;
1907 test.type = sk->min_type;
1908 test.offset = sk->min_offset;
1909
1910 ret = btrfs_comp_cpu_keys(key, &test);
1911 if (ret < 0)
ac8e9819 1912 return 0;
abc6e134
CM		 1913
1914 test.objectid = sk->max_objectid;
1915 test.type = sk->max_type;
1916 test.offset = sk->max_offset;
1917
1918 ret = btrfs_comp_cpu_keys(key, &test);
1919 if (ret > 0)
ac8e9819
CM		 1920 return 0;
1921 return 1;
1922}
1923
1924static noinline int copy_to_sk(struct btrfs_root *root,
1925 struct btrfs_path *path,
1926 struct btrfs_key *key,
1927 struct btrfs_ioctl_search_key *sk,
1928 char *buf,
1929 unsigned long *sk_offset,
1930 int *num_found)
1931{
1932 u64 found_transid;
1933 struct extent_buffer *leaf;
1934 struct btrfs_ioctl_search_header sh;
1935 unsigned long item_off;
1936 unsigned long item_len;
1937 int nritems;
1938 int i;
1939 int slot;
ac8e9819
CM		 1940 int ret = 0;
1941
1942 leaf = path->nodes[0];
1943 slot = path->slots[0];
1944 nritems = btrfs_header_nritems(leaf);
1945
1946 if (btrfs_header_generation(leaf) > sk->max_transid) {
1947 i = nritems;
1948 goto advance_key;
1949 }
1950 found_transid = btrfs_header_generation(leaf);
1951
1952 for (i = slot; i < nritems; i++) {
1953 item_off = btrfs_item_ptr_offset(leaf, i);
1954 item_len = btrfs_item_size_nr(leaf, i);
1955
03b71c6c
GP		 1956 btrfs_item_key_to_cpu(leaf, key, i);
1957 if (!key_in_sk(key, sk))
1958 continue;
1959
1960 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
ac8e9819
CM		 1961 item_len = 0;
1962
1963 if (sizeof(sh) + item_len + *sk_offset >
1964 BTRFS_SEARCH_ARGS_BUFSIZE) {
1965 ret = 1;
1966 goto overflow;
1967 }
1968
ac8e9819
CM		 1969 sh.objectid = key->objectid;
1970 sh.offset = key->offset;
1971 sh.type = key->type;
1972 sh.len = item_len;
1973 sh.transid = found_transid;
1974
1975 /* copy search result header */
1976 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1977 *sk_offset += sizeof(sh);
1978
1979 if (item_len) {
1980 char *p = buf + *sk_offset;
1981 /* copy the item */
1982 read_extent_buffer(leaf, p,
1983 item_off, item_len);
1984 *sk_offset += item_len;
ac8e9819 1985 }
e2156867 1986 (*num_found)++;
ac8e9819
CM		 1987
1988 if (*num_found >= sk->nr_items)
1989 break;
1990 }
1991advance_key:
abc6e134
CM		 1992 ret = 0;
1993 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1994 key->offset++;
abc6e134
CM		 1995 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1996 key->offset = 0;
ac8e9819 1997 key->type++;
abc6e134
CM		 1998 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1999 key->offset = 0;
2000 key->type = 0;
ac8e9819 2001 key->objectid++;
abc6e134
CM		 2002 } else
2003 ret = 1;
ac8e9819 2004overflow:
ac8e9819
CM		 2005 return ret;
2006}
2007
2008static noinline int search_ioctl(struct inode *inode,
2009 struct btrfs_ioctl_search_args *args)
2010{
2011 struct btrfs_root *root;
2012 struct btrfs_key key;
ac8e9819
CM		 2013 struct btrfs_path *path;
2014 struct btrfs_ioctl_search_key *sk = &args->key;
2015 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2016 int ret;
2017 int num_found = 0;
2018 unsigned long sk_offset = 0;
2019
2020 path = btrfs_alloc_path();
2021 if (!path)
2022 return -ENOMEM;
2023
2024 if (sk->tree_id == 0) {
2025 /* search the root of the inode that was passed */
2026 root = BTRFS_I(inode)->root;
2027 } else {
2028 key.objectid = sk->tree_id;
2029 key.type = BTRFS_ROOT_ITEM_KEY;
2030 key.offset = (u64)-1;
2031 root = btrfs_read_fs_root_no_name(info, &key);
2032 if (IS_ERR(root)) {
efe120a0 2033 printk(KERN_ERR "BTRFS: could not find root %llu\n",
ac8e9819
CM		 2034 sk->tree_id);
2035 btrfs_free_path(path);
2036 return -ENOENT;
2037 }
2038 }
2039
2040 key.objectid = sk->min_objectid;
2041 key.type = sk->min_type;
2042 key.offset = sk->min_offset;
2043
ac8e9819
CM		 2044 path->keep_locks = 1;
2045
67871254 2046 while (1) {
6174d3cb 2047 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
ac8e9819
CM		 2048 if (ret != 0) {
2049 if (ret > 0)
2050 ret = 0;
2051 goto err;
2052 }
2053 ret = copy_to_sk(root, path, &key, sk, args->buf,
2054 &sk_offset, &num_found);
b3b4aa74 2055 btrfs_release_path(path);
ac8e9819
CM		 2056 if (ret || num_found >= sk->nr_items)
2057 break;
2058
2059 }
2060 ret = 0;
2061err:
2062 sk->nr_items = num_found;
2063 btrfs_free_path(path);
2064 return ret;
2065}
2066
2067static noinline int btrfs_ioctl_tree_search(struct file *file,
2068 void __user *argp)
2069{
2070 struct btrfs_ioctl_search_args *args;
2071 struct inode *inode;
2072 int ret;
2073
2074 if (!capable(CAP_SYS_ADMIN))
2075 return -EPERM;
2076
2354d08f
JL		 2077 args = memdup_user(argp, sizeof(*args));
2078 if (IS_ERR(args))
2079 return PTR_ERR(args);
ac8e9819 2080
496ad9aa 2081 inode = file_inode(file);
ac8e9819
CM		 2082 ret = search_ioctl(inode, args);
2083 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2084 ret = -EFAULT;
2085 kfree(args);
2086 return ret;
2087}
2088
98d377a0 2089/*
ac8e9819
CM		 2090 * Search INODE_REFs to identify path name of 'dirid' directory
2091 * in a 'tree_id' tree. and sets path name to 'name'.
2092 */
98d377a0
TH		 2093static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2094 u64 tree_id, u64 dirid, char *name)
2095{
2096 struct btrfs_root *root;
2097 struct btrfs_key key;
ac8e9819 2098 char *ptr;
98d377a0
TH		 2099 int ret = -1;
2100 int slot;
2101 int len;
2102 int total_len = 0;
2103 struct btrfs_inode_ref *iref;
2104 struct extent_buffer *l;
2105 struct btrfs_path *path;
2106
2107 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2108 name[0]='\0';
2109 return 0;
2110 }
2111
2112 path = btrfs_alloc_path();
2113 if (!path)
2114 return -ENOMEM;
2115
ac8e9819 2116 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 2117
2118 key.objectid = tree_id;
2119 key.type = BTRFS_ROOT_ITEM_KEY;
2120 key.offset = (u64)-1;
2121 root = btrfs_read_fs_root_no_name(info, &key);
2122 if (IS_ERR(root)) {
efe120a0 2123 printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
8ad6fcab
CM		 2124 ret = -ENOENT;
2125 goto out;
98d377a0
TH		 2126 }
2127
2128 key.objectid = dirid;
2129 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2130 key.offset = (u64)-1;
98d377a0 2131
67871254 2132 while (1) {
98d377a0
TH		 2133 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2134 if (ret < 0)
2135 goto out;
18674c6c
FDBM		 2136 else if (ret > 0) {
2137 ret = btrfs_previous_item(root, path, dirid,
2138 BTRFS_INODE_REF_KEY);
2139 if (ret < 0)
2140 goto out;
2141 else if (ret > 0) {
2142 ret = -ENOENT;
2143 goto out;
2144 }
2145 }
98d377a0
TH		 2146
2147 l = path->nodes[0];
2148 slot = path->slots[0];
2149 btrfs_item_key_to_cpu(l, &key, slot);
2150
98d377a0
TH		 2151 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2152 len = btrfs_inode_ref_name_len(l, iref);
2153 ptr -= len + 1;
2154 total_len += len + 1;
a696cf35
FDBM		 2155 if (ptr < name) {
2156 ret = -ENAMETOOLONG;
98d377a0 2157 goto out;
a696cf35 2158 }
98d377a0
TH		 2159
2160 *(ptr + len) = '/';
67871254 2161 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
98d377a0
TH		 2162
2163 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2164 break;
2165
b3b4aa74 2166 btrfs_release_path(path);
98d377a0 2167 key.objectid = key.offset;
8ad6fcab 2168 key.offset = (u64)-1;
98d377a0 2169 dirid = key.objectid;
98d377a0 2170 }
77906a50 2171 memmove(name, ptr, total_len);
67871254 2172 name[total_len] = '\0';
98d377a0
TH		 2173 ret = 0;
2174out:
2175 btrfs_free_path(path);
ac8e9819
CM		 2176 return ret;
2177}
2178
2179static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2180 void __user *argp)
2181{
2182 struct btrfs_ioctl_ino_lookup_args *args;
2183 struct inode *inode;
2184 int ret;
2185
2186 if (!capable(CAP_SYS_ADMIN))
2187 return -EPERM;
2188
2354d08f
JL		 2189 args = memdup_user(argp, sizeof(*args));
2190 if (IS_ERR(args))
2191 return PTR_ERR(args);
c2b96929 2192
496ad9aa 2193 inode = file_inode(file);
ac8e9819 2194
1b53ac4d
CM		 2195 if (args->treeid == 0)
2196 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2197
ac8e9819
CM		 2198 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2199 args->treeid, args->objectid,
2200 args->name);
2201
2202 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2203 ret = -EFAULT;
2204
2205 kfree(args);
98d377a0
TH		 2206 return ret;
2207}
2208
76dda93c
YZ		 2209static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2210 void __user *arg)
2211{
54563d41 2212 struct dentry *parent = file->f_path.dentry;
76dda93c
YZ		 2213 struct dentry *dentry;
2214 struct inode *dir = parent->d_inode;
2215 struct inode *inode;
2216 struct btrfs_root *root = BTRFS_I(dir)->root;
2217 struct btrfs_root *dest = NULL;
2218 struct btrfs_ioctl_vol_args *vol_args;
2219 struct btrfs_trans_handle *trans;
c58aaad2
MX		 2220 struct btrfs_block_rsv block_rsv;
2221 u64 qgroup_reserved;
76dda93c
YZ		 2222 int namelen;
2223 int ret;
2224 int err = 0;
2225
76dda93c
YZ		 2226 vol_args = memdup_user(arg, sizeof(*vol_args));
2227 if (IS_ERR(vol_args))
2228 return PTR_ERR(vol_args);
2229
2230 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2231 namelen = strlen(vol_args->name);
2232 if (strchr(vol_args->name, '/') ||
2233 strncmp(vol_args->name, "..", namelen) == 0) {
2234 err = -EINVAL;
2235 goto out;
2236 }
2237
a561be71 2238 err = mnt_want_write_file(file);
76dda93c
YZ		 2239 if (err)
2240 goto out;
2241
5c50c9b8
DS		 2242 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2243 if (err == -EINTR)
e43f998e 2244 goto out_drop_write;
76dda93c
YZ		 2245 dentry = lookup_one_len(vol_args->name, parent, namelen);
2246 if (IS_ERR(dentry)) {
2247 err = PTR_ERR(dentry);
2248 goto out_unlock_dir;
2249 }
2250
2251 if (!dentry->d_inode) {
2252 err = -ENOENT;
2253 goto out_dput;
2254 }
2255
2256 inode = dentry->d_inode;
4260f7c7 2257 dest = BTRFS_I(inode)->root;
67871254 2258 if (!capable(CAP_SYS_ADMIN)) {
4260f7c7
SW		 2259 /*
2260 * Regular user. Only allow this with a special mount
2261 * option, when the user has write+exec access to the
2262 * subvol root, and when rmdir(2) would have been
2263 * allowed.
2264 *
2265 * Note that this is _not_ check that the subvol is
2266 * empty or doesn't contain data that we wouldn't
2267 * otherwise be able to delete.
2268 *
2269 * Users who want to delete empty subvols should try
2270 * rmdir(2).
2271 */
2272 err = -EPERM;
2273 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2274 goto out_dput;
2275
2276 /*
2277 * Do not allow deletion if the parent dir is the same
2278 * as the dir to be deleted. That means the ioctl
2279 * must be called on the dentry referencing the root
2280 * of the subvol, not a random directory contained
2281 * within it.
2282 */
2283 err = -EINVAL;
2284 if (root == dest)
2285 goto out_dput;
2286
2287 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2288 if (err)
2289 goto out_dput;
4260f7c7
SW		 2290 }
2291
5c39da5b
MX		 2292 /* check if subvolume may be deleted by a user */
2293 err = btrfs_may_delete(dir, dentry, 1);
2294 if (err)
2295 goto out_dput;
2296
33345d01 2297 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2298 err = -EINVAL;
2299 goto out_dput;
2300 }
2301
76dda93c
YZ		 2302 mutex_lock(&inode->i_mutex);
2303 err = d_invalidate(dentry);
2304 if (err)
2305 goto out_unlock;
2306
2307 down_write(&root->fs_info->subvol_sem);
2308
2309 err = may_destroy_subvol(dest);
2310 if (err)
2311 goto out_up_write;
2312
c58aaad2
MX		 2313 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2314 /*
2315 * One for dir inode, two for dir entries, two for root
2316 * ref/backref.
2317 */
2318 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
ee3441b4 2319 5, &qgroup_reserved, true);
c58aaad2
MX		 2320 if (err)
2321 goto out_up_write;
2322
a22285a6
YZ		 2323 trans = btrfs_start_transaction(root, 0);
2324 if (IS_ERR(trans)) {
2325 err = PTR_ERR(trans);
c58aaad2 2326 goto out_release;
a22285a6 2327 }
c58aaad2
MX		 2328 trans->block_rsv = &block_rsv;
2329 trans->bytes_reserved = block_rsv.size;
a22285a6 2330
76dda93c
YZ		 2331 ret = btrfs_unlink_subvol(trans, root, dir,
2332 dest->root_key.objectid,
2333 dentry->d_name.name,
2334 dentry->d_name.len);
79787eaa
JM		 2335 if (ret) {
2336 err = ret;
2337 btrfs_abort_transaction(trans, root, ret);
2338 goto out_end_trans;
2339 }
76dda93c
YZ		 2340
2341 btrfs_record_root_in_trans(trans, dest);
2342
2343 memset(&dest->root_item.drop_progress, 0,
2344 sizeof(dest->root_item.drop_progress));
2345 dest->root_item.drop_level = 0;
2346 btrfs_set_root_refs(&dest->root_item, 0);
2347
d68fc57b
YZ		 2348 if (!xchg(&dest->orphan_item_inserted, 1)) {
2349 ret = btrfs_insert_orphan_item(trans,
2350 root->fs_info->tree_root,
2351 dest->root_key.objectid);
79787eaa
JM		 2352 if (ret) {
2353 btrfs_abort_transaction(trans, root, ret);
2354 err = ret;
2355 goto out_end_trans;
2356 }
d68fc57b 2357 }
dd5f9615
SB		 2358
2359 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2360 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2361 dest->root_key.objectid);
2362 if (ret && ret != -ENOENT) {
2363 btrfs_abort_transaction(trans, root, ret);
2364 err = ret;
2365 goto out_end_trans;
2366 }
2367 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2368 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2369 dest->root_item.received_uuid,
2370 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2371 dest->root_key.objectid);
2372 if (ret && ret != -ENOENT) {
2373 btrfs_abort_transaction(trans, root, ret);
2374 err = ret;
2375 goto out_end_trans;
2376 }
2377 }
2378
79787eaa 2379out_end_trans:
c58aaad2
MX		 2380 trans->block_rsv = NULL;
2381 trans->bytes_reserved = 0;
531cb13f 2382 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2383 if (ret && !err)
2384 err = ret;
76dda93c 2385 inode->i_flags |= S_DEAD;
c58aaad2
MX		 2386out_release:
2387 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
76dda93c
YZ		 2388out_up_write:
2389 up_write(&root->fs_info->subvol_sem);
2390out_unlock:
2391 mutex_unlock(&inode->i_mutex);
2392 if (!err) {
efefb143 2393 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2394 btrfs_invalidate_inodes(dest);
2395 d_delete(dentry);
fa6ac876
LB		 2396
2397 /* the last ref */
2398 if (dest->cache_inode) {
2399 iput(dest->cache_inode);
2400 dest->cache_inode = NULL;
2401 }
76dda93c
YZ		 2402 }
2403out_dput:
2404 dput(dentry);
2405out_unlock_dir:
2406 mutex_unlock(&dir->i_mutex);
e43f998e 2407out_drop_write:
2a79f17e 2408 mnt_drop_write_file(file);
76dda93c
YZ		 2409out:
2410 kfree(vol_args);
2411 return err;
2412}
2413
1e701a32 2414static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2415{
496ad9aa 2416 struct inode *inode = file_inode(file);
f46b5a66 2417 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2418 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2419 int ret;
2420
25122d15
ID		 2421 ret = mnt_want_write_file(file);
2422 if (ret)
2423 return ret;
b83cc969 2424
25122d15
ID		 2425 if (btrfs_root_readonly(root)) {
2426 ret = -EROFS;
2427 goto out;
5ac00add 2428 }
f46b5a66
CH		 2429
2430 switch (inode->i_mode & S_IFMT) {
2431 case S_IFDIR:
e441d54d
CM		 2432 if (!capable(CAP_SYS_ADMIN)) {
2433 ret = -EPERM;
2434 goto out;
2435 }
de78b51a 2436 ret = btrfs_defrag_root(root);
8929ecfa
YZ		 2437 if (ret)
2438 goto out;
de78b51a 2439 ret = btrfs_defrag_root(root->fs_info->extent_root);
f46b5a66
CH		 2440 break;
2441 case S_IFREG:
e441d54d
CM		 2442 if (!(file->f_mode & FMODE_WRITE)) {
2443 ret = -EINVAL;
2444 goto out;
2445 }
1e701a32
CM		 2446
2447 range = kzalloc(sizeof(*range), GFP_KERNEL);
2448 if (!range) {
2449 ret = -ENOMEM;
2450 goto out;
2451 }
2452
2453 if (argp) {
2454 if (copy_from_user(range, argp,
2455 sizeof(*range))) {
2456 ret = -EFAULT;
2457 kfree(range);
683be16e 2458 goto out;
1e701a32
CM		 2459 }
2460 /* compression requires us to start the IO */
2461 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2462 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2463 range->extent_thresh = (u32)-1;
2464 }
2465 } else {
2466 /* the rest are all set to zero by kzalloc */
2467 range->len = (u64)-1;
2468 }
496ad9aa 2469 ret = btrfs_defrag_file(file_inode(file), file,
4cb5300b
CM		 2470 range, 0, 0);
2471 if (ret > 0)
2472 ret = 0;
1e701a32 2473 kfree(range);
f46b5a66 2474 break;
8929ecfa
YZ		 2475 default:
2476 ret = -EINVAL;
f46b5a66 2477 }
e441d54d 2478out:
25122d15 2479 mnt_drop_write_file(file);
e441d54d 2480 return ret;
f46b5a66
CH		 2481}
2482
b2950863 2483static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2484{
2485 struct btrfs_ioctl_vol_args *vol_args;
2486 int ret;
2487
e441d54d
CM		 2488 if (!capable(CAP_SYS_ADMIN))
2489 return -EPERM;
2490
5ac00add
SB		 2491 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2492 1)) {
e57138b3 2493 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 2494 }
2495
5ac00add 2496 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2497 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2498 if (IS_ERR(vol_args)) {
2499 ret = PTR_ERR(vol_args);
2500 goto out;
2501 }
f46b5a66 2502
5516e595 2503 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2504 ret = btrfs_init_new_device(root, vol_args->name);
2505
f46b5a66 2506 kfree(vol_args);
c9e9f97b
ID		 2507out:
2508 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2509 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
f46b5a66
CH		 2510 return ret;
2511}
2512
da24927b 2513static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 2514{
496ad9aa 2515 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 2516 struct btrfs_ioctl_vol_args *vol_args;
2517 int ret;
2518
e441d54d
CM		 2519 if (!capable(CAP_SYS_ADMIN))
2520 return -EPERM;
2521
da24927b
MX		 2522 ret = mnt_want_write_file(file);
2523 if (ret)
2524 return ret;
c146afad 2525
dae7b665 2526 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2527 if (IS_ERR(vol_args)) {
2528 ret = PTR_ERR(vol_args);
2529 goto out;
2530 }
f46b5a66 2531
5516e595 2532 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 2533
183860f6
AJ		 2534 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2535 1)) {
2536 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2537 goto out;
2538 }
2539
2540 mutex_lock(&root->fs_info->volume_mutex);
2541 ret = btrfs_rm_device(root, vol_args->name);
c9e9f97b 2542 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2543 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
183860f6
AJ		 2544
2545out:
2546 kfree(vol_args);
4ac20c70 2547 mnt_drop_write_file(file);
f46b5a66
CH		 2548 return ret;
2549}
2550
475f6387
JS		 2551static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2552{
027ed2f0 2553 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2554 struct btrfs_device *device;
2555 struct btrfs_device *next;
2556 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2557 int ret = 0;
475f6387
JS		 2558
2559 if (!capable(CAP_SYS_ADMIN))
2560 return -EPERM;
2561
027ed2f0
LZ		 2562 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2563 if (!fi_args)
2564 return -ENOMEM;
2565
f7171750 2566 mutex_lock(&fs_devices->device_list_mutex);
027ed2f0
LZ		 2567 fi_args->num_devices = fs_devices->num_devices;
2568 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387 2569
475f6387 2570 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2571 if (device->devid > fi_args->max_id)
2572 fi_args->max_id = device->devid;
475f6387
JS		 2573 }
2574 mutex_unlock(&fs_devices->device_list_mutex);
2575
027ed2f0
LZ		 2576 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2577 ret = -EFAULT;
475f6387 2578
027ed2f0
LZ		 2579 kfree(fi_args);
2580 return ret;
475f6387
JS		 2581}
2582
2583static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2584{
2585 struct btrfs_ioctl_dev_info_args *di_args;
2586 struct btrfs_device *dev;
2587 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2588 int ret = 0;
2589 char *s_uuid = NULL;
475f6387
JS		 2590
2591 if (!capable(CAP_SYS_ADMIN))
2592 return -EPERM;
2593
2594 di_args = memdup_user(arg, sizeof(*di_args));
2595 if (IS_ERR(di_args))
2596 return PTR_ERR(di_args);
2597
dd5f9615 2598 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 2599 s_uuid = di_args->uuid;
2600
2601 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2602 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2603
2604 if (!dev) {
2605 ret = -ENODEV;
2606 goto out;
2607 }
2608
2609 di_args->devid = dev->devid;
2610 di_args->bytes_used = dev->bytes_used;
2611 di_args->total_bytes = dev->total_bytes;
2612 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2613 if (dev->name) {
606686ee
JB		 2614 struct rcu_string *name;
2615
2616 rcu_read_lock();
2617 name = rcu_dereference(dev->name);
2618 strncpy(di_args->path, name->str, sizeof(di_args->path));
2619 rcu_read_unlock();
a27202fb
JM		 2620 di_args->path[sizeof(di_args->path) - 1] = 0;
2621 } else {
99ba55ad 2622 di_args->path[0] = '\0';
a27202fb 2623 }
475f6387
JS		 2624
2625out:
55793c0d 2626 mutex_unlock(&fs_devices->device_list_mutex);
475f6387
JS		 2627 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2628 ret = -EFAULT;
2629
2630 kfree(di_args);
2631 return ret;
2632}
2633
416161db
MF		 2634static struct page *extent_same_get_page(struct inode *inode, u64 off)
2635{
2636 struct page *page;
2637 pgoff_t index;
2638 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2639
2640 index = off >> PAGE_CACHE_SHIFT;
2641
2642 page = grab_cache_page(inode->i_mapping, index);
2643 if (!page)
2644 return NULL;
2645
2646 if (!PageUptodate(page)) {
2647 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2648 0))
2649 return NULL;
2650 lock_page(page);
2651 if (!PageUptodate(page)) {
2652 unlock_page(page);
2653 page_cache_release(page);
2654 return NULL;
2655 }
2656 }
2657 unlock_page(page);
2658
2659 return page;
2660}
2661
77fe20dc
MF		 2662static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2663{
2664 /* do any pending delalloc/csum calc on src, one way or
2665 another, and lock file content */
2666 while (1) {
2667 struct btrfs_ordered_extent *ordered;
2668 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2669 ordered = btrfs_lookup_first_ordered_extent(inode,
2670 off + len - 1);
2671 if (!ordered &&
2672 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2673 off + len - 1, EXTENT_DELALLOC, 0, NULL))
2674 break;
2675 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2676 if (ordered)
2677 btrfs_put_ordered_extent(ordered);
2678 btrfs_wait_ordered_range(inode, off, len);
2679 }
2680}
2681
416161db
MF		 2682static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2683 struct inode *inode2, u64 loff2, u64 len)
2684{
2685 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2686 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2687
2688 mutex_unlock(&inode1->i_mutex);
2689 mutex_unlock(&inode2->i_mutex);
2690}
2691
2692static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2693 struct inode *inode2, u64 loff2, u64 len)
2694{
2695 if (inode1 < inode2) {
2696 swap(inode1, inode2);
2697 swap(loff1, loff2);
2698 }
2699
2700 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2701 lock_extent_range(inode1, loff1, len);
2702 if (inode1 != inode2) {
2703 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2704 lock_extent_range(inode2, loff2, len);
2705 }
2706}
2707
2708static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2709 u64 dst_loff, u64 len)
2710{
2711 int ret = 0;
2712 struct page *src_page, *dst_page;
2713 unsigned int cmp_len = PAGE_CACHE_SIZE;
2714 void *addr, *dst_addr;
2715
2716 while (len) {
2717 if (len < PAGE_CACHE_SIZE)
2718 cmp_len = len;
2719
2720 src_page = extent_same_get_page(src, loff);
2721 if (!src_page)
2722 return -EINVAL;
2723 dst_page = extent_same_get_page(dst, dst_loff);
2724 if (!dst_page) {
2725 page_cache_release(src_page);
2726 return -EINVAL;
2727 }
2728 addr = kmap_atomic(src_page);
2729 dst_addr = kmap_atomic(dst_page);
2730
2731 flush_dcache_page(src_page);
2732 flush_dcache_page(dst_page);
2733
2734 if (memcmp(addr, dst_addr, cmp_len))
2735 ret = BTRFS_SAME_DATA_DIFFERS;
2736
2737 kunmap_atomic(addr);
2738 kunmap_atomic(dst_addr);
2739 page_cache_release(src_page);
2740 page_cache_release(dst_page);
2741
2742 if (ret)
2743 break;
2744
2745 loff += cmp_len;
2746 dst_loff += cmp_len;
2747 len -= cmp_len;
2748 }
2749
2750 return ret;
2751}
2752
2753static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2754{
2755 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2756
2757 if (off + len > inode->i_size || off + len < off)
2758 return -EINVAL;
2759 /* Check that we are block aligned - btrfs_clone() requires this */
2760 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2761 return -EINVAL;
2762
2763 return 0;
2764}
2765
2766static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2767 struct inode *dst, u64 dst_loff)
2768{
2769 int ret;
2770
2771 /*
2772 * btrfs_clone() can't handle extents in the same file
2773 * yet. Once that works, we can drop this check and replace it
2774 * with a check for the same inode, but overlapping extents.
2775 */
2776 if (src == dst)
2777 return -EINVAL;
2778
2779 btrfs_double_lock(src, loff, dst, dst_loff, len);
2780
2781 ret = extent_same_check_offsets(src, loff, len);
2782 if (ret)
2783 goto out_unlock;
2784
2785 ret = extent_same_check_offsets(dst, dst_loff, len);
2786 if (ret)
2787 goto out_unlock;
2788
2789 /* don't make the dst file partly checksummed */
2790 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2791 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2792 ret = -EINVAL;
2793 goto out_unlock;
2794 }
2795
2796 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2797 if (ret == 0)
2798 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2799
2800out_unlock:
2801 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2802
2803 return ret;
2804}
2805
2806#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2807
2808static long btrfs_ioctl_file_extent_same(struct file *file,
2809 void __user *argp)
2810{
cbf8b8ca
MF		 2811 struct btrfs_ioctl_same_args tmp;
2812 struct btrfs_ioctl_same_args *same;
2813 struct btrfs_ioctl_same_extent_info *info;
416161db
MF		 2814 struct inode *src = file->f_dentry->d_inode;
2815 struct file *dst_file = NULL;
2816 struct inode *dst;
2817 u64 off;
2818 u64 len;
2819 int i;
2820 int ret;
cbf8b8ca 2821 unsigned long size;
416161db
MF		 2822 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2823 bool is_admin = capable(CAP_SYS_ADMIN);
2824
2825 if (!(file->f_mode & FMODE_READ))
2826 return -EINVAL;
2827
2828 ret = mnt_want_write_file(file);
2829 if (ret)
2830 return ret;
2831
cbf8b8ca 2832 if (copy_from_user(&tmp,
416161db 2833 (struct btrfs_ioctl_same_args __user *)argp,
cbf8b8ca 2834 sizeof(tmp))) {
416161db
MF		 2835 ret = -EFAULT;
2836 goto out;
2837 }
2838
cbf8b8ca
MF		 2839 size = sizeof(tmp) +
2840 tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);
2841
229eed43 2842 same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);
cbf8b8ca 2843
229eed43
GB		 2844 if (IS_ERR(same)) {
2845 ret = PTR_ERR(same);
cbf8b8ca
MF		 2846 goto out;
2847 }
2848
2849 off = same->logical_offset;
2850 len = same->length;
416161db
MF		 2851
2852 /*
2853 * Limit the total length we will dedupe for each operation.
2854 * This is intended to bound the total time spent in this
2855 * ioctl to something sane.
2856 */
2857 if (len > BTRFS_MAX_DEDUPE_LEN)
2858 len = BTRFS_MAX_DEDUPE_LEN;
2859
2860 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2861 /*
2862 * Btrfs does not support blocksize < page_size. As a
2863 * result, btrfs_cmp_data() won't correctly handle
2864 * this situation without an update.
2865 */
2866 ret = -EINVAL;
2867 goto out;
2868 }
2869
2870 ret = -EISDIR;
2871 if (S_ISDIR(src->i_mode))
2872 goto out;
2873
2874 ret = -EACCES;
2875 if (!S_ISREG(src->i_mode))
2876 goto out;
2877
cbf8b8ca
MF		 2878 /* pre-format output fields to sane values */
2879 for (i = 0; i < same->dest_count; i++) {
2880 same->info[i].bytes_deduped = 0ULL;
2881 same->info[i].status = 0;
2882 }
416161db 2883
cbf8b8ca
MF		 2884 ret = 0;
2885 for (i = 0; i < same->dest_count; i++) {
2886 info = &same->info[i];
416161db 2887
cbf8b8ca 2888 dst_file = fget(info->fd);
416161db 2889 if (!dst_file) {
cbf8b8ca 2890 info->status = -EBADF;
416161db
MF		 2891 goto next;
2892 }
2893
2894 if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
cbf8b8ca 2895 info->status = -EINVAL;
416161db
MF		 2896 goto next;
2897 }
2898
cbf8b8ca 2899 info->status = -EXDEV;
416161db
MF		 2900 if (file->f_path.mnt != dst_file->f_path.mnt)
2901 goto next;
2902
2903 dst = dst_file->f_dentry->d_inode;
2904 if (src->i_sb != dst->i_sb)
2905 goto next;
2906
2907 if (S_ISDIR(dst->i_mode)) {
cbf8b8ca 2908 info->status = -EISDIR;
416161db
MF		 2909 goto next;
2910 }
2911
2912 if (!S_ISREG(dst->i_mode)) {
cbf8b8ca 2913 info->status = -EACCES;
416161db
MF		 2914 goto next;
2915 }
2916
cbf8b8ca
MF		 2917 info->status = btrfs_extent_same(src, off, len, dst,
2918 info->logical_offset);
2919 if (info->status == 0)
2920 info->bytes_deduped += len;
416161db
MF		 2921
2922next:
2923 if (dst_file)
2924 fput(dst_file);
416161db
MF		 2925 }
2926
cbf8b8ca
MF		 2927 ret = copy_to_user(argp, same, size);
2928 if (ret)
2929 ret = -EFAULT;
2930
416161db
MF		 2931out:
2932 mnt_drop_write_file(file);
2933 return ret;
2934}
2935
32b7c687
MF		 2936/**
2937 * btrfs_clone() - clone a range from inode file to another
2938 *
2939 * @src: Inode to clone from
2940 * @inode: Inode to clone to
2941 * @off: Offset within source to start clone from
2942 * @olen: Original length, passed by user, of range to clone
2943 * @olen_aligned: Block-aligned value of olen, extent_same uses
2944 * identical values here
2945 * @destoff: Offset within @inode to start clone
2946 */
2947static int btrfs_clone(struct inode *src, struct inode *inode,
2948 u64 off, u64 olen, u64 olen_aligned, u64 destoff)
f46b5a66 2949{
f46b5a66 2950 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 2951 struct btrfs_path *path = NULL;
f46b5a66 2952 struct extent_buffer *leaf;
32b7c687
MF		 2953 struct btrfs_trans_handle *trans;
2954 char *buf = NULL;
ae01a0ab 2955 struct btrfs_key key;
f46b5a66
CH		 2956 u32 nritems;
2957 int slot;
ae01a0ab 2958 int ret;
32b7c687 2959 u64 len = olen_aligned;
ae01a0ab
YZ		 2960
2961 ret = -ENOMEM;
2962 buf = vmalloc(btrfs_level_size(root, 0));
2963 if (!buf)
32b7c687 2964 return ret;
ae01a0ab
YZ		 2965
2966 path = btrfs_alloc_path();
2967 if (!path) {
2968 vfree(buf);
32b7c687 2969 return ret;
d525e8ab
LZ		 2970 }
2971
32b7c687 2972 path->reada = 2;
c5c9cd4d 2973 /* clone data */
33345d01 2974 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2975 key.type = BTRFS_EXTENT_DATA_KEY;
2976 key.offset = 0;
f46b5a66
CH		 2977
2978 while (1) {
2979 /*
2980 * note the key will change type as we walk through the
2981 * tree.
2982 */
e4355f34 2983 path->leave_spinning = 1;
362a20c5
DS		 2984 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2985 0, 0);
f46b5a66
CH		 2986 if (ret < 0)
2987 goto out;
2988
ae01a0ab 2989 nritems = btrfs_header_nritems(path->nodes[0]);
e4355f34 2990process_slot:
ae01a0ab 2991 if (path->slots[0] >= nritems) {
362a20c5 2992 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2993 if (ret < 0)
2994 goto out;
2995 if (ret > 0)
2996 break;
ae01a0ab 2997 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2998 }
2999 leaf = path->nodes[0];
3000 slot = path->slots[0];
f46b5a66 3001
ae01a0ab 3002 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 3003 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 3004 key.objectid != btrfs_ino(src))
f46b5a66
CH		 3005 break;
3006
c5c9cd4d
SW		 3007 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3008 struct btrfs_file_extent_item *extent;
3009 int type;
31840ae1
ZY		 3010 u32 size;
3011 struct btrfs_key new_key;
c5c9cd4d
SW		 3012 u64 disko = 0, diskl = 0;
3013 u64 datao = 0, datal = 0;
3014 u8 comp;
b5384d48 3015 u64 endoff;
31840ae1 3016
c5c9cd4d
SW		 3017 extent = btrfs_item_ptr(leaf, slot,
3018 struct btrfs_file_extent_item);
3019 comp = btrfs_file_extent_compression(leaf, extent);
3020 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 3021 if (type == BTRFS_FILE_EXTENT_REG ||
3022 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 3023 disko = btrfs_file_extent_disk_bytenr(leaf,
3024 extent);
3025 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3026 extent);
c5c9cd4d 3027 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 3028 datal = btrfs_file_extent_num_bytes(leaf,
3029 extent);
c5c9cd4d
SW		 3030 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3031 /* take upper bound, may be compressed */
3032 datal = btrfs_file_extent_ram_bytes(leaf,
3033 extent);
3034 }
31840ae1 3035
050006a7 3036 if (key.offset + datal <= off ||
e4355f34
FDBM		 3037 key.offset >= off + len - 1) {
3038 path->slots[0]++;
3039 goto process_slot;
3040 }
3041
3042 size = btrfs_item_size_nr(leaf, slot);
3043 read_extent_buffer(leaf, buf,
3044 btrfs_item_ptr_offset(leaf, slot),
3045 size);
3046
3047 btrfs_release_path(path);
3048 path->leave_spinning = 0;
c5c9cd4d 3049
31840ae1 3050 memcpy(&new_key, &key, sizeof(new_key));
33345d01 3051 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 3052 if (off <= key.offset)
3053 new_key.offset = key.offset + destoff - off;
3054 else
3055 new_key.offset = destoff;
31840ae1 3056
b6f3409b
SW		 3057 /*
3058 * 1 - adjusting old extent (we may have to split it)
3059 * 1 - add new extent
3060 * 1 - inode update
3061 */
3062 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 3063 if (IS_ERR(trans)) {
3064 ret = PTR_ERR(trans);
3065 goto out;
3066 }
3067
c8a894d7
CM		 3068 if (type == BTRFS_FILE_EXTENT_REG ||
3069 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 3070 /*
3071 * a | --- range to clone ---| b
3072 * | ------------- extent ------------- |
3073 */
3074
3075 /* substract range b */
3076 if (key.offset + datal > off + len)
3077 datal = off + len - key.offset;
3078
3079 /* substract range a */
a22285a6
YZ		 3080 if (off > key.offset) {
3081 datao += off - key.offset;
3082 datal -= off - key.offset;
3083 }
3084
5dc562c5 3085 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 3086 new_key.offset,
3087 new_key.offset + datal,
2671485d 3088 1);
79787eaa
JM		 3089 if (ret) {
3090 btrfs_abort_transaction(trans, root,
3091 ret);
3092 btrfs_end_transaction(trans, root);
3093 goto out;
3094 }
a22285a6 3095
c5c9cd4d
SW		 3096 ret = btrfs_insert_empty_item(trans, root, path,
3097 &new_key, size);
79787eaa
JM		 3098 if (ret) {
3099 btrfs_abort_transaction(trans, root,
3100 ret);
3101 btrfs_end_transaction(trans, root);
3102 goto out;
3103 }
c5c9cd4d
SW		 3104
3105 leaf = path->nodes[0];
3106 slot = path->slots[0];
3107 write_extent_buffer(leaf, buf,
31840ae1
ZY		 3108 btrfs_item_ptr_offset(leaf, slot),
3109 size);
ae01a0ab 3110
c5c9cd4d 3111 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 3112 struct btrfs_file_extent_item);
c5c9cd4d 3113
c5c9cd4d
SW		 3114 /* disko == 0 means it's a hole */
3115 if (!disko)
3116 datao = 0;
c5c9cd4d
SW		 3117
3118 btrfs_set_file_extent_offset(leaf, extent,
3119 datao);
3120 btrfs_set_file_extent_num_bytes(leaf, extent,
3121 datal);
3122 if (disko) {
3123 inode_add_bytes(inode, datal);
ae01a0ab 3124 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 3125 disko, diskl, 0,
3126 root->root_key.objectid,
33345d01 3127 btrfs_ino(inode),
66d7e7f0
AJ		 3128 new_key.offset - datao,
3129 0);
79787eaa
JM		 3130 if (ret) {
3131 btrfs_abort_transaction(trans,
3132 root,
3133 ret);
3134 btrfs_end_transaction(trans,
3135 root);
3136 goto out;
3137
3138 }
f46b5a66 3139 }
c5c9cd4d
SW		 3140 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3141 u64 skip = 0;
3142 u64 trim = 0;
3143 if (off > key.offset) {
3144 skip = off - key.offset;
3145 new_key.offset += skip;
3146 }
d397712b 3147
aa42ffd9
LB		 3148 if (key.offset + datal > off + len)
3149 trim = key.offset + datal - (off + len);
d397712b 3150
c5c9cd4d 3151 if (comp && (skip || trim)) {
c5c9cd4d 3152 ret = -EINVAL;
a22285a6 3153 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 3154 goto out;
3155 }
3156 size -= skip + trim;
3157 datal -= skip + trim;
a22285a6 3158
5dc562c5 3159 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 3160 new_key.offset,
3161 new_key.offset + datal,
2671485d 3162 1);
79787eaa
JM		 3163 if (ret) {
3164 btrfs_abort_transaction(trans, root,
3165 ret);
3166 btrfs_end_transaction(trans, root);
3167 goto out;
3168 }
a22285a6 3169
c5c9cd4d
SW		 3170 ret = btrfs_insert_empty_item(trans, root, path,
3171 &new_key, size);
79787eaa
JM		 3172 if (ret) {
3173 btrfs_abort_transaction(trans, root,
3174 ret);
3175 btrfs_end_transaction(trans, root);
3176 goto out;
3177 }
c5c9cd4d
SW		 3178
3179 if (skip) {
d397712b
CM		 3180 u32 start =
3181 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 3182 memmove(buf+start, buf+start+skip,
3183 datal);
3184 }
3185
3186 leaf = path->nodes[0];
3187 slot = path->slots[0];
3188 write_extent_buffer(leaf, buf,
3189 btrfs_item_ptr_offset(leaf, slot),
3190 size);
3191 inode_add_bytes(inode, datal);
f46b5a66 3192 }
c5c9cd4d
SW		 3193
3194 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 3195 btrfs_release_path(path);
c5c9cd4d 3196
0c4d2d95 3197 inode_inc_iversion(inode);
a22285a6 3198 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 3199
3200 /*
3201 * we round up to the block size at eof when
3202 * determining which extents to clone above,
3203 * but shouldn't round up the file size
3204 */
3205 endoff = new_key.offset + datal;
5f3888ff
LZ		 3206 if (endoff > destoff+olen)
3207 endoff = destoff+olen;
b5384d48
SW		 3208 if (endoff > inode->i_size)
3209 btrfs_i_size_write(inode, endoff);
3210
a22285a6 3211 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 3212 if (ret) {
3213 btrfs_abort_transaction(trans, root, ret);
3214 btrfs_end_transaction(trans, root);
3215 goto out;
3216 }
3217 ret = btrfs_end_transaction(trans, root);
a22285a6 3218 }
b3b4aa74 3219 btrfs_release_path(path);
f46b5a66 3220 key.offset++;
f46b5a66 3221 }
f46b5a66 3222 ret = 0;
32b7c687 3223
f46b5a66 3224out:
b3b4aa74 3225 btrfs_release_path(path);
32b7c687
MF		 3226 btrfs_free_path(path);
3227 vfree(buf);
3228 return ret;
3229}
3230
3231static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3232 u64 off, u64 olen, u64 destoff)
3233{
54563d41 3234 struct inode *inode = file_inode(file);
32b7c687
MF		 3235 struct btrfs_root *root = BTRFS_I(inode)->root;
3236 struct fd src_file;
3237 struct inode *src;
3238 int ret;
3239 u64 len = olen;
3240 u64 bs = root->fs_info->sb->s_blocksize;
3241 int same_inode = 0;
3242
3243 /*
3244 * TODO:
3245 * - split compressed inline extents. annoying: we need to
3246 * decompress into destination's address_space (the file offset
3247 * may change, so source mapping won't do), then recompress (or
3248 * otherwise reinsert) a subrange.
3249 * - allow ranges within the same file to be cloned (provided
3250 * they don't overlap)?
3251 */
3252
3253 /* the destination must be opened for writing */
3254 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3255 return -EINVAL;
3256
3257 if (btrfs_root_readonly(root))
3258 return -EROFS;
3259
3260 ret = mnt_want_write_file(file);
3261 if (ret)
3262 return ret;
3263
3264 src_file = fdget(srcfd);
3265 if (!src_file.file) {
3266 ret = -EBADF;
3267 goto out_drop_write;
3268 }
3269
3270 ret = -EXDEV;
3271 if (src_file.file->f_path.mnt != file->f_path.mnt)
3272 goto out_fput;
3273
3274 src = file_inode(src_file.file);
3275
3276 ret = -EINVAL;
3277 if (src == inode)
3278 same_inode = 1;
3279
3280 /* the src must be open for reading */
3281 if (!(src_file.file->f_mode & FMODE_READ))
3282 goto out_fput;
3283
3284 /* don't make the dst file partly checksummed */
3285 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3286 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3287 goto out_fput;
3288
3289 ret = -EISDIR;
3290 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3291 goto out_fput;
3292
3293 ret = -EXDEV;
3294 if (src->i_sb != inode->i_sb)
3295 goto out_fput;
3296
3297 if (!same_inode) {
3298 if (inode < src) {
3299 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3300 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3301 } else {
3302 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3303 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3304 }
3305 } else {
3306 mutex_lock(&src->i_mutex);
3307 }
3308
3309 /* determine range to clone */
3310 ret = -EINVAL;
3311 if (off + len > src->i_size || off + len < off)
3312 goto out_unlock;
3313 if (len == 0)
3314 olen = len = src->i_size - off;
3315 /* if we extend to eof, continue to block boundary */
3316 if (off + len == src->i_size)
3317 len = ALIGN(src->i_size, bs) - off;
3318
3319 /* verify the end result is block aligned */
3320 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3321 !IS_ALIGNED(destoff, bs))
3322 goto out_unlock;
3323
3324 /* verify if ranges are overlapped within the same file */
3325 if (same_inode) {
3326 if (destoff + len > off && destoff < off + len)
3327 goto out_unlock;
3328 }
3329
3330 if (destoff > inode->i_size) {
3331 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3332 if (ret)
3333 goto out_unlock;
3334 }
3335
3336 /* truncate page cache pages from target inode range */
3337 truncate_inode_pages_range(&inode->i_data, destoff,
3338 PAGE_CACHE_ALIGN(destoff + len) - 1);
3339
3340 lock_extent_range(src, off, len);
3341
3342 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3343
aa42ffd9 3344 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66 3345out_unlock:
c57c2b3e
FDBM		 3346 if (!same_inode) {
3347 if (inode < src) {
3348 mutex_unlock(&src->i_mutex);
3349 mutex_unlock(&inode->i_mutex);
3350 } else {
3351 mutex_unlock(&inode->i_mutex);
3352 mutex_unlock(&src->i_mutex);
3353 }
3354 } else {
3355 mutex_unlock(&src->i_mutex);
3356 }
f46b5a66 3357out_fput:
2903ff01 3358 fdput(src_file);
ab67b7c1 3359out_drop_write:
2a79f17e 3360 mnt_drop_write_file(file);
f46b5a66
CH		 3361 return ret;
3362}
3363
7a865e8a 3364static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 3365{
3366 struct btrfs_ioctl_clone_range_args args;
3367
7a865e8a 3368 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 3369 return -EFAULT;
3370 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3371 args.src_length, args.dest_offset);
3372}
3373
f46b5a66
CH		 3374/*
3375 * there are many ways the trans_start and trans_end ioctls can lead
3376 * to deadlocks. They should only be used by applications that
3377 * basically own the machine, and have a very in depth understanding
3378 * of all the possible deadlocks and enospc problems.
3379 */
b2950863 3380static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66 3381{
496ad9aa 3382 struct inode *inode = file_inode(file);
f46b5a66
CH		 3383 struct btrfs_root *root = BTRFS_I(inode)->root;
3384 struct btrfs_trans_handle *trans;
1ab86aed 3385 int ret;
f46b5a66 3386
1ab86aed 3387 ret = -EPERM;
df5b5520 3388 if (!capable(CAP_SYS_ADMIN))
1ab86aed 3389 goto out;
df5b5520 3390
1ab86aed
SW		 3391 ret = -EINPROGRESS;
3392 if (file->private_data)
f46b5a66 3393 goto out;
9ca9ee09 3394
b83cc969
LZ		 3395 ret = -EROFS;
3396 if (btrfs_root_readonly(root))
3397 goto out;
3398
a561be71 3399 ret = mnt_want_write_file(file);
c146afad
YZ		 3400 if (ret)
3401 goto out;
3402
a4abeea4 3403 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 3404
1ab86aed 3405 ret = -ENOMEM;
7a7eaa40 3406 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 3407 if (IS_ERR(trans))
1ab86aed
SW		 3408 goto out_drop;
3409
3410 file->private_data = trans;
3411 return 0;
3412
3413out_drop:
a4abeea4 3414 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 3415 mnt_drop_write_file(file);
f46b5a66 3416out:
f46b5a66
CH		 3417 return ret;
3418}
3419
6ef5ed0d
JB		 3420static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3421{
496ad9aa 3422 struct inode *inode = file_inode(file);
6ef5ed0d
JB		 3423 struct btrfs_root *root = BTRFS_I(inode)->root;
3424 struct btrfs_root *new_root;
3425 struct btrfs_dir_item *di;
3426 struct btrfs_trans_handle *trans;
3427 struct btrfs_path *path;
3428 struct btrfs_key location;
3429 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 3430 u64 objectid = 0;
3431 u64 dir_id;
3c04ce01 3432 int ret;
6ef5ed0d
JB		 3433
3434 if (!capable(CAP_SYS_ADMIN))
3435 return -EPERM;
3436
3c04ce01
MX		 3437 ret = mnt_want_write_file(file);
3438 if (ret)
3439 return ret;
3440
3441 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3442 ret = -EFAULT;
3443 goto out;
3444 }
6ef5ed0d
JB		 3445
3446 if (!objectid)
1cecf579 3447 objectid = BTRFS_FS_TREE_OBJECTID;
6ef5ed0d
JB		 3448
3449 location.objectid = objectid;
3450 location.type = BTRFS_ROOT_ITEM_KEY;
3451 location.offset = (u64)-1;
3452
3453 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3c04ce01
MX		 3454 if (IS_ERR(new_root)) {
3455 ret = PTR_ERR(new_root);
3456 goto out;
3457 }
6ef5ed0d 3458
6ef5ed0d 3459 path = btrfs_alloc_path();
3c04ce01
MX		 3460 if (!path) {
3461 ret = -ENOMEM;
3462 goto out;
3463 }
6ef5ed0d
JB		 3464 path->leave_spinning = 1;
3465
3466 trans = btrfs_start_transaction(root, 1);
98d5dc13 3467 if (IS_ERR(trans)) {
6ef5ed0d 3468 btrfs_free_path(path);
3c04ce01
MX		 3469 ret = PTR_ERR(trans);
3470 goto out;
6ef5ed0d
JB		 3471 }
3472
6c41761f 3473 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 3474 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3475 dir_id, "default", 7, 1);
cf1e99a4 3476 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 3477 btrfs_free_path(path);
3478 btrfs_end_transaction(trans, root);
efe120a0
FH		 3479 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3480 "item, this isn't going to work");
3c04ce01
MX		 3481 ret = -ENOENT;
3482 goto out;
6ef5ed0d
JB		 3483 }
3484
3485 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3486 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3487 btrfs_mark_buffer_dirty(path->nodes[0]);
3488 btrfs_free_path(path);
3489
2b0ce2c2 3490 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d 3491 btrfs_end_transaction(trans, root);
3c04ce01
MX		 3492out:
3493 mnt_drop_write_file(file);
3494 return ret;
6ef5ed0d
JB		 3495}
3496
5af3e8cc
SB		 3497void btrfs_get_block_group_info(struct list_head *groups_list,
3498 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 3499{
3500 struct btrfs_block_group_cache *block_group;
3501
3502 space->total_bytes = 0;
3503 space->used_bytes = 0;
3504 space->flags = 0;
3505 list_for_each_entry(block_group, groups_list, list) {
3506 space->flags = block_group->flags;
3507 space->total_bytes += block_group->key.offset;
3508 space->used_bytes +=
3509 btrfs_block_group_used(&block_group->item);
3510 }
3511}
3512
48a3b636 3513static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1406e432
JB		 3514{
3515 struct btrfs_ioctl_space_args space_args;
3516 struct btrfs_ioctl_space_info space;
3517 struct btrfs_ioctl_space_info *dest;
7fde62bf 3518 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 3519 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 3520 struct btrfs_space_info *info;
bf5fc093
JB		 3521 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3522 BTRFS_BLOCK_GROUP_SYSTEM,
3523 BTRFS_BLOCK_GROUP_METADATA,
3524 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3525 int num_types = 4;
7fde62bf 3526 int alloc_size;
1406e432 3527 int ret = 0;
51788b1b 3528 u64 slot_count = 0;
bf5fc093 3529 int i, c;
1406e432
JB		 3530
3531 if (copy_from_user(&space_args,
3532 (struct btrfs_ioctl_space_args __user *)arg,
3533 sizeof(space_args)))
3534 return -EFAULT;
3535
bf5fc093
JB		 3536 for (i = 0; i < num_types; i++) {
3537 struct btrfs_space_info *tmp;
3538
3539 info = NULL;
3540 rcu_read_lock();
3541 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3542 list) {
3543 if (tmp->flags == types[i]) {
3544 info = tmp;
3545 break;
3546 }
3547 }
3548 rcu_read_unlock();
3549
3550 if (!info)
3551 continue;
3552
3553 down_read(&info->groups_sem);
3554 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3555 if (!list_empty(&info->block_groups[c]))
3556 slot_count++;
3557 }
3558 up_read(&info->groups_sem);
3559 }
7fde62bf
CM		 3560
3561 /* space_slots == 0 means they are asking for a count */
3562 if (space_args.space_slots == 0) {
3563 space_args.total_spaces = slot_count;
3564 goto out;
3565 }
bf5fc093 3566
51788b1b 3567 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 3568
7fde62bf 3569 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 3570
7fde62bf
CM		 3571 /* we generally have at most 6 or so space infos, one for each raid
3572 * level. So, a whole page should be more than enough for everyone
3573 */
3574 if (alloc_size > PAGE_CACHE_SIZE)
3575 return -ENOMEM;
3576
1406e432 3577 space_args.total_spaces = 0;
7fde62bf
CM		 3578 dest = kmalloc(alloc_size, GFP_NOFS);
3579 if (!dest)
3580 return -ENOMEM;
3581 dest_orig = dest;
1406e432 3582
7fde62bf 3583 /* now we have a buffer to copy into */
bf5fc093
JB		 3584 for (i = 0; i < num_types; i++) {
3585 struct btrfs_space_info *tmp;
3586
51788b1b
DR		 3587 if (!slot_count)
3588 break;
3589
bf5fc093
JB		 3590 info = NULL;
3591 rcu_read_lock();
3592 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3593 list) {
3594 if (tmp->flags == types[i]) {
3595 info = tmp;
3596 break;
3597 }
3598 }
3599 rcu_read_unlock();
7fde62bf 3600
bf5fc093
JB		 3601 if (!info)
3602 continue;
3603 down_read(&info->groups_sem);
3604 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3605 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 3606 btrfs_get_block_group_info(
3607 &info->block_groups[c], &space);
bf5fc093
JB		 3608 memcpy(dest, &space, sizeof(space));
3609 dest++;
3610 space_args.total_spaces++;
51788b1b 3611 slot_count--;
bf5fc093 3612 }
51788b1b
DR		 3613 if (!slot_count)
3614 break;
bf5fc093
JB		 3615 }
3616 up_read(&info->groups_sem);
1406e432 3617 }
1406e432 3618
2eec6c81 3619 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3620 (arg + sizeof(struct btrfs_ioctl_space_args));
3621
3622 if (copy_to_user(user_dest, dest_orig, alloc_size))
3623 ret = -EFAULT;
3624
3625 kfree(dest_orig);
3626out:
3627 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3628 ret = -EFAULT;
3629
3630 return ret;
3631}
3632
f46b5a66
CH		 3633/*
3634 * there are many ways the trans_start and trans_end ioctls can lead
3635 * to deadlocks. They should only be used by applications that
3636 * basically own the machine, and have a very in depth understanding
3637 * of all the possible deadlocks and enospc problems.
3638 */
3639long btrfs_ioctl_trans_end(struct file *file)
3640{
496ad9aa 3641 struct inode *inode = file_inode(file);
f46b5a66
CH		 3642 struct btrfs_root *root = BTRFS_I(inode)->root;
3643 struct btrfs_trans_handle *trans;
f46b5a66 3644
f46b5a66 3645 trans = file->private_data;
1ab86aed
SW		 3646 if (!trans)
3647 return -EINVAL;
b214107e 3648 file->private_data = NULL;
9ca9ee09 3649
1ab86aed
SW		 3650 btrfs_end_transaction(trans, root);
3651
a4abeea4 3652 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3653
2a79f17e 3654 mnt_drop_write_file(file);
1ab86aed 3655 return 0;
f46b5a66
CH		 3656}
3657
9a8c28be
MX		 3658static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3659 void __user *argp)
46204592 3660{
46204592
SW		 3661 struct btrfs_trans_handle *trans;
3662 u64 transid;
db5b493a 3663 int ret;
46204592 3664
d4edf39b 3665 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 3666 if (IS_ERR(trans)) {
3667 if (PTR_ERR(trans) != -ENOENT)
3668 return PTR_ERR(trans);
3669
3670 /* No running transaction, don't bother */
3671 transid = root->fs_info->last_trans_committed;
3672 goto out;
3673 }
46204592 3674 transid = trans->transid;
db5b493a 3675 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3676 if (ret) {
3677 btrfs_end_transaction(trans, root);
db5b493a 3678 return ret;
8b2b2d3c 3679 }
ff7c1d33 3680out:
46204592
SW		 3681 if (argp)
3682 if (copy_to_user(argp, &transid, sizeof(transid)))
3683 return -EFAULT;
3684 return 0;
3685}
3686
9a8c28be
MX		 3687static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3688 void __user *argp)
46204592 3689{
46204592
SW		 3690 u64 transid;
3691
3692 if (argp) {
3693 if (copy_from_user(&transid, argp, sizeof(transid)))
3694 return -EFAULT;
3695 } else {
3696 transid = 0; /* current trans */
3697 }
3698 return btrfs_wait_for_commit(root, transid);
3699}
3700
b8e95489 3701static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 3702{
496ad9aa 3703 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
475f6387 3704 struct btrfs_ioctl_scrub_args *sa;
b8e95489 3705 int ret;
475f6387
JS		 3706
3707 if (!capable(CAP_SYS_ADMIN))
3708 return -EPERM;
3709
3710 sa = memdup_user(arg, sizeof(*sa));
3711 if (IS_ERR(sa))
3712 return PTR_ERR(sa);
3713
b8e95489
MX		 3714 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3715 ret = mnt_want_write_file(file);
3716 if (ret)
3717 goto out;
3718 }
3719
aa1b8cd4 3720 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 3721 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3722 0);
475f6387
JS		 3723
3724 if (copy_to_user(arg, sa, sizeof(*sa)))
3725 ret = -EFAULT;
3726
b8e95489
MX		 3727 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3728 mnt_drop_write_file(file);
3729out:
475f6387
JS		 3730 kfree(sa);
3731 return ret;
3732}
3733
3734static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3735{
3736 if (!capable(CAP_SYS_ADMIN))
3737 return -EPERM;
3738
aa1b8cd4 3739 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3740}
3741
3742static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3743 void __user *arg)
3744{
3745 struct btrfs_ioctl_scrub_args *sa;
3746 int ret;
3747
3748 if (!capable(CAP_SYS_ADMIN))
3749 return -EPERM;
3750
3751 sa = memdup_user(arg, sizeof(*sa));
3752 if (IS_ERR(sa))
3753 return PTR_ERR(sa);
3754
3755 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3756
3757 if (copy_to_user(arg, sa, sizeof(*sa)))
3758 ret = -EFAULT;
3759
3760 kfree(sa);
3761 return ret;
3762}
3763
c11d2c23 3764static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3765 void __user *arg)
c11d2c23
SB		 3766{
3767 struct btrfs_ioctl_get_dev_stats *sa;
3768 int ret;
3769
c11d2c23
SB		 3770 sa = memdup_user(arg, sizeof(*sa));
3771 if (IS_ERR(sa))
3772 return PTR_ERR(sa);
3773
b27f7c0c
DS		 3774 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3775 kfree(sa);
3776 return -EPERM;
3777 }
3778
3779 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3780
3781 if (copy_to_user(arg, sa, sizeof(*sa)))
3782 ret = -EFAULT;
3783
3784 kfree(sa);
3785 return ret;
3786}
3787
3f6bcfbd
SB		 3788static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3789{
3790 struct btrfs_ioctl_dev_replace_args *p;
3791 int ret;
3792
3793 if (!capable(CAP_SYS_ADMIN))
3794 return -EPERM;
3795
3796 p = memdup_user(arg, sizeof(*p));
3797 if (IS_ERR(p))
3798 return PTR_ERR(p);
3799
3800 switch (p->cmd) {
3801 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
adfa97cb
ID		 3802 if (root->fs_info->sb->s_flags & MS_RDONLY) {
3803 ret = -EROFS;
3804 goto out;
3805 }
3f6bcfbd
SB		 3806 if (atomic_xchg(
3807 &root->fs_info->mutually_exclusive_operation_running,
3808 1)) {
e57138b3 3809 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd
SB		 3810 } else {
3811 ret = btrfs_dev_replace_start(root, p);
3812 atomic_set(
3813 &root->fs_info->mutually_exclusive_operation_running,
3814 0);
3815 }
3816 break;
3817 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3818 btrfs_dev_replace_status(root->fs_info, p);
3819 ret = 0;
3820 break;
3821 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3822 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3823 break;
3824 default:
3825 ret = -EINVAL;
3826 break;
3827 }
3828
3829 if (copy_to_user(arg, p, sizeof(*p)))
3830 ret = -EFAULT;
adfa97cb 3831out:
3f6bcfbd
SB		 3832 kfree(p);
3833 return ret;
3834}
3835
d7728c96
JS		 3836static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3837{
3838 int ret = 0;
3839 int i;
740c3d22 3840 u64 rel_ptr;
d7728c96 3841 int size;
806468f8 3842 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3843 struct inode_fs_paths *ipath = NULL;
3844 struct btrfs_path *path;
3845
82b22ac8 3846 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 3847 return -EPERM;
3848
3849 path = btrfs_alloc_path();
3850 if (!path) {
3851 ret = -ENOMEM;
3852 goto out;
3853 }
3854
3855 ipa = memdup_user(arg, sizeof(*ipa));
3856 if (IS_ERR(ipa)) {
3857 ret = PTR_ERR(ipa);
3858 ipa = NULL;
3859 goto out;
3860 }
3861
3862 size = min_t(u32, ipa->size, 4096);
3863 ipath = init_ipath(size, root, path);
3864 if (IS_ERR(ipath)) {
3865 ret = PTR_ERR(ipath);
3866 ipath = NULL;
3867 goto out;
3868 }
3869
3870 ret = paths_from_inode(ipa->inum, ipath);
3871 if (ret < 0)
3872 goto out;
3873
3874 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3875 rel_ptr = ipath->fspath->val[i] -
3876 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3877 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3878 }
3879
745c4d8e
JM		 3880 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3881 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3882 if (ret) {
3883 ret = -EFAULT;
3884 goto out;
3885 }
3886
3887out:
3888 btrfs_free_path(path);
3889 free_ipath(ipath);
3890 kfree(ipa);
3891
3892 return ret;
3893}
3894
3895static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3896{
3897 struct btrfs_data_container *inodes = ctx;
3898 const size_t c = 3 * sizeof(u64);
3899
3900 if (inodes->bytes_left >= c) {
3901 inodes->bytes_left -= c;
3902 inodes->val[inodes->elem_cnt] = inum;
3903 inodes->val[inodes->elem_cnt + 1] = offset;
3904 inodes->val[inodes->elem_cnt + 2] = root;
3905 inodes->elem_cnt += 3;
3906 } else {
3907 inodes->bytes_missing += c - inodes->bytes_left;
3908 inodes->bytes_left = 0;
3909 inodes->elem_missed += 3;
3910 }
3911
3912 return 0;
3913}
3914
3915static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3916 void __user *arg)
3917{
3918 int ret = 0;
3919 int size;
d7728c96
JS		 3920 struct btrfs_ioctl_logical_ino_args *loi;
3921 struct btrfs_data_container *inodes = NULL;
3922 struct btrfs_path *path = NULL;
d7728c96
JS		 3923
3924 if (!capable(CAP_SYS_ADMIN))
3925 return -EPERM;
3926
3927 loi = memdup_user(arg, sizeof(*loi));
3928 if (IS_ERR(loi)) {
3929 ret = PTR_ERR(loi);
3930 loi = NULL;
3931 goto out;
3932 }
3933
3934 path = btrfs_alloc_path();
3935 if (!path) {
3936 ret = -ENOMEM;
3937 goto out;
3938 }
3939
425d17a2 3940 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3941 inodes = init_data_container(size);
3942 if (IS_ERR(inodes)) {
3943 ret = PTR_ERR(inodes);
3944 inodes = NULL;
3945 goto out;
3946 }
3947
df031f07
LB		 3948 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3949 build_ino_list, inodes);
3950 if (ret == -EINVAL)
d7728c96
JS		 3951 ret = -ENOENT;
3952 if (ret < 0)
3953 goto out;
3954
745c4d8e
JM		 3955 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3956 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3957 if (ret)
3958 ret = -EFAULT;
3959
3960out:
3961 btrfs_free_path(path);
425d17a2 3962 vfree(inodes);
d7728c96
JS		 3963 kfree(loi);
3964
3965 return ret;
3966}
3967
19a39dce 3968void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3969 struct btrfs_ioctl_balance_args *bargs)
3970{
3971 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3972
3973 bargs->flags = bctl->flags;
3974
837d5b6e
ID		 3975 if (atomic_read(&fs_info->balance_running))
3976 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3977 if (atomic_read(&fs_info->balance_pause_req))
3978 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3979 if (atomic_read(&fs_info->balance_cancel_req))
3980 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3981
c9e9f97b
ID		 3982 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3983 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3984 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3985
3986 if (lock) {
3987 spin_lock(&fs_info->balance_lock);
3988 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3989 spin_unlock(&fs_info->balance_lock);
3990 } else {
3991 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3992 }
c9e9f97b
ID		 3993}
3994
9ba1f6e4 3995static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 3996{
496ad9aa 3997 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 3998 struct btrfs_fs_info *fs_info = root->fs_info;
3999 struct btrfs_ioctl_balance_args *bargs;
4000 struct btrfs_balance_control *bctl;
ed0fb78f 4001 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 4002 int ret;
4003
4004 if (!capable(CAP_SYS_ADMIN))
4005 return -EPERM;
4006
e54bfa31 4007 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 4008 if (ret)
4009 return ret;
4010
ed0fb78f
ID		 4011again:
4012 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4013 mutex_lock(&fs_info->volume_mutex);
4014 mutex_lock(&fs_info->balance_mutex);
4015 need_unlock = true;
4016 goto locked;
4017 }
4018
4019 /*
4020 * mut. excl. ops lock is locked. Three possibilites:
4021 * (1) some other op is running
4022 * (2) balance is running
4023 * (3) balance is paused -- special case (think resume)
4024 */
c9e9f97b 4025 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 4026 if (fs_info->balance_ctl) {
4027 /* this is either (2) or (3) */
4028 if (!atomic_read(&fs_info->balance_running)) {
4029 mutex_unlock(&fs_info->balance_mutex);
4030 if (!mutex_trylock(&fs_info->volume_mutex))
4031 goto again;
4032 mutex_lock(&fs_info->balance_mutex);
4033
4034 if (fs_info->balance_ctl &&
4035 !atomic_read(&fs_info->balance_running)) {
4036 /* this is (3) */
4037 need_unlock = false;
4038 goto locked;
4039 }
4040
4041 mutex_unlock(&fs_info->balance_mutex);
4042 mutex_unlock(&fs_info->volume_mutex);
4043 goto again;
4044 } else {
4045 /* this is (2) */
4046 mutex_unlock(&fs_info->balance_mutex);
4047 ret = -EINPROGRESS;
4048 goto out;
4049 }
4050 } else {
4051 /* this is (1) */
4052 mutex_unlock(&fs_info->balance_mutex);
e57138b3 4053 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 4054 goto out;
4055 }
4056
4057locked:
4058 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
c9e9f97b
ID		 4059
4060 if (arg) {
4061 bargs = memdup_user(arg, sizeof(*bargs));
4062 if (IS_ERR(bargs)) {
4063 ret = PTR_ERR(bargs);
ed0fb78f 4064 goto out_unlock;
c9e9f97b 4065 }
de322263
ID		 4066
4067 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4068 if (!fs_info->balance_ctl) {
4069 ret = -ENOTCONN;
4070 goto out_bargs;
4071 }
4072
4073 bctl = fs_info->balance_ctl;
4074 spin_lock(&fs_info->balance_lock);
4075 bctl->flags |= BTRFS_BALANCE_RESUME;
4076 spin_unlock(&fs_info->balance_lock);
4077
4078 goto do_balance;
4079 }
c9e9f97b
ID		 4080 } else {
4081 bargs = NULL;
4082 }
4083
ed0fb78f 4084 if (fs_info->balance_ctl) {
837d5b6e
ID		 4085 ret = -EINPROGRESS;
4086 goto out_bargs;
4087 }
4088
c9e9f97b
ID		 4089 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
4090 if (!bctl) {
4091 ret = -ENOMEM;
4092 goto out_bargs;
4093 }
4094
4095 bctl->fs_info = fs_info;
4096 if (arg) {
4097 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4098 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4099 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4100
4101 bctl->flags = bargs->flags;
f43ffb60
ID		 4102 } else {
4103 /* balance everything - no filters */
4104 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 4105 }
4106
de322263 4107do_balance:
c9e9f97b 4108 /*
ed0fb78f
ID		 4109 * Ownership of bctl and mutually_exclusive_operation_running
4110 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4111 * or, if restriper was paused all the way until unmount, in
4112 * free_fs_info. mutually_exclusive_operation_running is
4113 * cleared in __cancel_balance.
c9e9f97b 4114 */
ed0fb78f
ID		 4115 need_unlock = false;
4116
4117 ret = btrfs_balance(bctl, bargs);
4118
c9e9f97b
ID		 4119 if (arg) {
4120 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4121 ret = -EFAULT;
4122 }
4123
4124out_bargs:
4125 kfree(bargs);
ed0fb78f 4126out_unlock:
c9e9f97b
ID		 4127 mutex_unlock(&fs_info->balance_mutex);
4128 mutex_unlock(&fs_info->volume_mutex);
ed0fb78f
ID		 4129 if (need_unlock)
4130 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4131out:
e54bfa31 4132 mnt_drop_write_file(file);
c9e9f97b
ID		 4133 return ret;
4134}
4135
837d5b6e
ID		 4136static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4137{
4138 if (!capable(CAP_SYS_ADMIN))
4139 return -EPERM;
4140
4141 switch (cmd) {
4142 case BTRFS_BALANCE_CTL_PAUSE:
4143 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 4144 case BTRFS_BALANCE_CTL_CANCEL:
4145 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 4146 }
4147
4148 return -EINVAL;
4149}
4150
19a39dce
ID		 4151static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4152 void __user *arg)
4153{
4154 struct btrfs_fs_info *fs_info = root->fs_info;
4155 struct btrfs_ioctl_balance_args *bargs;
4156 int ret = 0;
4157
4158 if (!capable(CAP_SYS_ADMIN))
4159 return -EPERM;
4160
4161 mutex_lock(&fs_info->balance_mutex);
4162 if (!fs_info->balance_ctl) {
4163 ret = -ENOTCONN;
4164 goto out;
4165 }
4166
4167 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4168 if (!bargs) {
4169 ret = -ENOMEM;
4170 goto out;
4171 }
4172
4173 update_ioctl_balance_args(fs_info, 1, bargs);
4174
4175 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4176 ret = -EFAULT;
4177
4178 kfree(bargs);
4179out:
4180 mutex_unlock(&fs_info->balance_mutex);
4181 return ret;
4182}
4183
905b0dda 4184static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4185{
496ad9aa 4186 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4187 struct btrfs_ioctl_quota_ctl_args *sa;
4188 struct btrfs_trans_handle *trans = NULL;
4189 int ret;
4190 int err;
4191
4192 if (!capable(CAP_SYS_ADMIN))
4193 return -EPERM;
4194
905b0dda
MX		 4195 ret = mnt_want_write_file(file);
4196 if (ret)
4197 return ret;
5d13a37b
AJ		 4198
4199 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4200 if (IS_ERR(sa)) {
4201 ret = PTR_ERR(sa);
4202 goto drop_write;
4203 }
5d13a37b 4204
7708f029 4205 down_write(&root->fs_info->subvol_sem);
2f232036
JS		 4206 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4207 if (IS_ERR(trans)) {
4208 ret = PTR_ERR(trans);
4209 goto out;
5d13a37b
AJ		 4210 }
4211
4212 switch (sa->cmd) {
4213 case BTRFS_QUOTA_CTL_ENABLE:
4214 ret = btrfs_quota_enable(trans, root->fs_info);
4215 break;
4216 case BTRFS_QUOTA_CTL_DISABLE:
4217 ret = btrfs_quota_disable(trans, root->fs_info);
4218 break;
5d13a37b
AJ		 4219 default:
4220 ret = -EINVAL;
4221 break;
4222 }
4223
2f232036
JS		 4224 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4225 if (err && !ret)
4226 ret = err;
5d13a37b
AJ		 4227out:
4228 kfree(sa);
7708f029 4229 up_write(&root->fs_info->subvol_sem);
905b0dda
MX		 4230drop_write:
4231 mnt_drop_write_file(file);
5d13a37b
AJ		 4232 return ret;
4233}
4234
905b0dda 4235static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4236{
496ad9aa 4237 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4238 struct btrfs_ioctl_qgroup_assign_args *sa;
4239 struct btrfs_trans_handle *trans;
4240 int ret;
4241 int err;
4242
4243 if (!capable(CAP_SYS_ADMIN))
4244 return -EPERM;
4245
905b0dda
MX		 4246 ret = mnt_want_write_file(file);
4247 if (ret)
4248 return ret;
5d13a37b
AJ		 4249
4250 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4251 if (IS_ERR(sa)) {
4252 ret = PTR_ERR(sa);
4253 goto drop_write;
4254 }
5d13a37b
AJ		 4255
4256 trans = btrfs_join_transaction(root);
4257 if (IS_ERR(trans)) {
4258 ret = PTR_ERR(trans);
4259 goto out;
4260 }
4261
4262 /* FIXME: check if the IDs really exist */
4263 if (sa->assign) {
4264 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4265 sa->src, sa->dst);
4266 } else {
4267 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4268 sa->src, sa->dst);
4269 }
4270
4271 err = btrfs_end_transaction(trans, root);
4272 if (err && !ret)
4273 ret = err;
4274
4275out:
4276 kfree(sa);
905b0dda
MX		 4277drop_write:
4278 mnt_drop_write_file(file);
5d13a37b
AJ		 4279 return ret;
4280}
4281
905b0dda 4282static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4283{
496ad9aa 4284 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4285 struct btrfs_ioctl_qgroup_create_args *sa;
4286 struct btrfs_trans_handle *trans;
4287 int ret;
4288 int err;
4289
4290 if (!capable(CAP_SYS_ADMIN))
4291 return -EPERM;
4292
905b0dda
MX		 4293 ret = mnt_want_write_file(file);
4294 if (ret)
4295 return ret;
5d13a37b
AJ		 4296
4297 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4298 if (IS_ERR(sa)) {
4299 ret = PTR_ERR(sa);
4300 goto drop_write;
4301 }
5d13a37b 4302
d86e56cf
MX		 4303 if (!sa->qgroupid) {
4304 ret = -EINVAL;
4305 goto out;
4306 }
4307
5d13a37b
AJ		 4308 trans = btrfs_join_transaction(root);
4309 if (IS_ERR(trans)) {
4310 ret = PTR_ERR(trans);
4311 goto out;
4312 }
4313
4314 /* FIXME: check if the IDs really exist */
4315 if (sa->create) {
4316 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4317 NULL);
4318 } else {
4319 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4320 }
4321
4322 err = btrfs_end_transaction(trans, root);
4323 if (err && !ret)
4324 ret = err;
4325
4326out:
4327 kfree(sa);
905b0dda
MX		 4328drop_write:
4329 mnt_drop_write_file(file);
5d13a37b
AJ		 4330 return ret;
4331}
4332
905b0dda 4333static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4334{
496ad9aa 4335 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4336 struct btrfs_ioctl_qgroup_limit_args *sa;
4337 struct btrfs_trans_handle *trans;
4338 int ret;
4339 int err;
4340 u64 qgroupid;
4341
4342 if (!capable(CAP_SYS_ADMIN))
4343 return -EPERM;
4344
905b0dda
MX		 4345 ret = mnt_want_write_file(file);
4346 if (ret)
4347 return ret;
5d13a37b
AJ		 4348
4349 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4350 if (IS_ERR(sa)) {
4351 ret = PTR_ERR(sa);
4352 goto drop_write;
4353 }
5d13a37b
AJ		 4354
4355 trans = btrfs_join_transaction(root);
4356 if (IS_ERR(trans)) {
4357 ret = PTR_ERR(trans);
4358 goto out;
4359 }
4360
4361 qgroupid = sa->qgroupid;
4362 if (!qgroupid) {
4363 /* take the current subvol as qgroup */
4364 qgroupid = root->root_key.objectid;
4365 }
4366
4367 /* FIXME: check if the IDs really exist */
4368 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4369
4370 err = btrfs_end_transaction(trans, root);
4371 if (err && !ret)
4372 ret = err;
4373
4374out:
4375 kfree(sa);
905b0dda
MX		 4376drop_write:
4377 mnt_drop_write_file(file);
5d13a37b
AJ		 4378 return ret;
4379}
4380
2f232036
JS		 4381static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4382{
6d0379ec 4383 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4384 struct btrfs_ioctl_quota_rescan_args *qsa;
4385 int ret;
4386
4387 if (!capable(CAP_SYS_ADMIN))
4388 return -EPERM;
4389
4390 ret = mnt_want_write_file(file);
4391 if (ret)
4392 return ret;
4393
4394 qsa = memdup_user(arg, sizeof(*qsa));
4395 if (IS_ERR(qsa)) {
4396 ret = PTR_ERR(qsa);
4397 goto drop_write;
4398 }
4399
4400 if (qsa->flags) {
4401 ret = -EINVAL;
4402 goto out;
4403 }
4404
4405 ret = btrfs_qgroup_rescan(root->fs_info);
4406
4407out:
4408 kfree(qsa);
4409drop_write:
4410 mnt_drop_write_file(file);
4411 return ret;
4412}
4413
4414static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4415{
6d0379ec 4416 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4417 struct btrfs_ioctl_quota_rescan_args *qsa;
4418 int ret = 0;
4419
4420 if (!capable(CAP_SYS_ADMIN))
4421 return -EPERM;
4422
4423 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4424 if (!qsa)
4425 return -ENOMEM;
4426
4427 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4428 qsa->flags = 1;
4429 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4430 }
4431
4432 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4433 ret = -EFAULT;
4434
4435 kfree(qsa);
4436 return ret;
4437}
4438
57254b6e
JS		 4439static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4440{
54563d41 4441 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
57254b6e
JS		 4442
4443 if (!capable(CAP_SYS_ADMIN))
4444 return -EPERM;
4445
4446 return btrfs_qgroup_wait_for_completion(root->fs_info);
4447}
4448
abccd00f
HM		 4449static long _btrfs_ioctl_set_received_subvol(struct file *file,
4450 struct btrfs_ioctl_received_subvol_args *sa)
8ea05e3a 4451{
496ad9aa 4452 struct inode *inode = file_inode(file);
8ea05e3a
AB		 4453 struct btrfs_root *root = BTRFS_I(inode)->root;
4454 struct btrfs_root_item *root_item = &root->root_item;
4455 struct btrfs_trans_handle *trans;
4456 struct timespec ct = CURRENT_TIME;
4457 int ret = 0;
dd5f9615 4458 int received_uuid_changed;
8ea05e3a 4459
bd60ea0f
DS		 4460 if (!inode_owner_or_capable(inode))
4461 return -EPERM;
4462
8ea05e3a
AB		 4463 ret = mnt_want_write_file(file);
4464 if (ret < 0)
4465 return ret;
4466
4467 down_write(&root->fs_info->subvol_sem);
4468
4469 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4470 ret = -EINVAL;
4471 goto out;
4472 }
4473
4474 if (btrfs_root_readonly(root)) {
4475 ret = -EROFS;
4476 goto out;
4477 }
4478
dd5f9615
SB		 4479 /*
4480 * 1 - root item
4481 * 2 - uuid items (received uuid + subvol uuid)
4482 */
4483 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 4484 if (IS_ERR(trans)) {
4485 ret = PTR_ERR(trans);
4486 trans = NULL;
4487 goto out;
4488 }
4489
4490 sa->rtransid = trans->transid;
4491 sa->rtime.sec = ct.tv_sec;
4492 sa->rtime.nsec = ct.tv_nsec;
4493
dd5f9615
SB		 4494 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4495 BTRFS_UUID_SIZE);
4496 if (received_uuid_changed &&
4497 !btrfs_is_empty_uuid(root_item->received_uuid))
4498 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4499 root_item->received_uuid,
4500 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4501 root->root_key.objectid);
8ea05e3a
AB		 4502 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4503 btrfs_set_root_stransid(root_item, sa->stransid);
4504 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 4505 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4506 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4507 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4508 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a
AB		 4509
4510 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4511 &root->root_key, &root->root_item);
4512 if (ret < 0) {
4513 btrfs_end_transaction(trans, root);
8ea05e3a 4514 goto out;
dd5f9615
SB		 4515 }
4516 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4517 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4518 sa->uuid,
4519 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4520 root->root_key.objectid);
4521 if (ret < 0 && ret != -EEXIST) {
4522 btrfs_abort_transaction(trans, root, ret);
8ea05e3a 4523 goto out;
dd5f9615
SB		 4524 }
4525 }
4526 ret = btrfs_commit_transaction(trans, root);
4527 if (ret < 0) {
4528 btrfs_abort_transaction(trans, root, ret);
4529 goto out;
8ea05e3a
AB		 4530 }
4531
abccd00f
HM		 4532out:
4533 up_write(&root->fs_info->subvol_sem);
4534 mnt_drop_write_file(file);
4535 return ret;
4536}
4537
4538#ifdef CONFIG_64BIT
4539static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4540 void __user *arg)
4541{
4542 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4543 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4544 int ret = 0;
4545
4546 args32 = memdup_user(arg, sizeof(*args32));
4547 if (IS_ERR(args32)) {
4548 ret = PTR_ERR(args32);
4549 args32 = NULL;
4550 goto out;
4551 }
4552
4553 args64 = kmalloc(sizeof(*args64), GFP_NOFS);
4554 if (IS_ERR(args64)) {
4555 ret = PTR_ERR(args64);
4556 args64 = NULL;
4557 goto out;
4558 }
4559
4560 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4561 args64->stransid = args32->stransid;
4562 args64->rtransid = args32->rtransid;
4563 args64->stime.sec = args32->stime.sec;
4564 args64->stime.nsec = args32->stime.nsec;
4565 args64->rtime.sec = args32->rtime.sec;
4566 args64->rtime.nsec = args32->rtime.nsec;
4567 args64->flags = args32->flags;
4568
4569 ret = _btrfs_ioctl_set_received_subvol(file, args64);
4570 if (ret)
4571 goto out;
4572
4573 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4574 args32->stransid = args64->stransid;
4575 args32->rtransid = args64->rtransid;
4576 args32->stime.sec = args64->stime.sec;
4577 args32->stime.nsec = args64->stime.nsec;
4578 args32->rtime.sec = args64->rtime.sec;
4579 args32->rtime.nsec = args64->rtime.nsec;
4580 args32->flags = args64->flags;
4581
4582 ret = copy_to_user(arg, args32, sizeof(*args32));
4583 if (ret)
4584 ret = -EFAULT;
4585
4586out:
4587 kfree(args32);
4588 kfree(args64);
4589 return ret;
4590}
4591#endif
4592
4593static long btrfs_ioctl_set_received_subvol(struct file *file,
4594 void __user *arg)
4595{
4596 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4597 int ret = 0;
4598
4599 sa = memdup_user(arg, sizeof(*sa));
4600 if (IS_ERR(sa)) {
4601 ret = PTR_ERR(sa);
4602 sa = NULL;
4603 goto out;
4604 }
4605
4606 ret = _btrfs_ioctl_set_received_subvol(file, sa);
4607
4608 if (ret)
4609 goto out;
4610
8ea05e3a
AB		 4611 ret = copy_to_user(arg, sa, sizeof(*sa));
4612 if (ret)
4613 ret = -EFAULT;
4614
4615out:
4616 kfree(sa);
8ea05e3a
AB		 4617 return ret;
4618}
4619
867ab667 4620static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4621{
6d0379ec 4622 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a1b83ac5 4623 size_t len;
867ab667 4624 int ret;
a1b83ac5
AJ		 4625 char label[BTRFS_LABEL_SIZE];
4626
4627 spin_lock(&root->fs_info->super_lock);
4628 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4629 spin_unlock(&root->fs_info->super_lock);
4630
4631 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 4632
4633 if (len == BTRFS_LABEL_SIZE) {
efe120a0
FH		 4634 btrfs_warn(root->fs_info,
4635 "label is too long, return the first %zu bytes", --len);
867ab667 4636 }
4637
867ab667 4638 ret = copy_to_user(arg, label, len);
867ab667 4639
4640 return ret ? -EFAULT : 0;
4641}
4642
a8bfd4ab 4643static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4644{
6d0379ec 4645 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a8bfd4ab 4646 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4647 struct btrfs_trans_handle *trans;
4648 char label[BTRFS_LABEL_SIZE];
4649 int ret;
4650
4651 if (!capable(CAP_SYS_ADMIN))
4652 return -EPERM;
4653
4654 if (copy_from_user(label, arg, sizeof(label)))
4655 return -EFAULT;
4656
4657 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
efe120a0 4658 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
a8bfd4ab 4659 BTRFS_LABEL_SIZE - 1);
4660 return -EINVAL;
4661 }
4662
4663 ret = mnt_want_write_file(file);
4664 if (ret)
4665 return ret;
4666
a8bfd4ab 4667 trans = btrfs_start_transaction(root, 0);
4668 if (IS_ERR(trans)) {
4669 ret = PTR_ERR(trans);
4670 goto out_unlock;
4671 }
4672
a1b83ac5 4673 spin_lock(&root->fs_info->super_lock);
a8bfd4ab 4674 strcpy(super_block->label, label);
a1b83ac5 4675 spin_unlock(&root->fs_info->super_lock);
d0270aca 4676 ret = btrfs_commit_transaction(trans, root);
a8bfd4ab 4677
4678out_unlock:
a8bfd4ab 4679 mnt_drop_write_file(file);
4680 return ret;
4681}
4682
2eaa055f
JM		 4683#define INIT_FEATURE_FLAGS(suffix) \
4684 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4685 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4686 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4687
4688static int btrfs_ioctl_get_supported_features(struct file *file,
4689 void __user *arg)
4690{
4691 static struct btrfs_ioctl_feature_flags features[3] = {
4692 INIT_FEATURE_FLAGS(SUPP),
4693 INIT_FEATURE_FLAGS(SAFE_SET),
4694 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4695 };
4696
4697 if (copy_to_user(arg, &features, sizeof(features)))
4698 return -EFAULT;
4699
4700 return 0;
4701}
4702
4703static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
4704{
4705 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4706 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4707 struct btrfs_ioctl_feature_flags features;
4708
4709 features.compat_flags = btrfs_super_compat_flags(super_block);
4710 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4711 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4712
4713 if (copy_to_user(arg, &features, sizeof(features)))
4714 return -EFAULT;
4715
4716 return 0;
4717}
4718
3b02a68a
JM		 4719static int check_feature_bits(struct btrfs_root *root,
4720 enum btrfs_feature_set set,
2eaa055f
JM		 4721 u64 change_mask, u64 flags, u64 supported_flags,
4722 u64 safe_set, u64 safe_clear)
4723{
3b02a68a
JM		 4724 const char *type = btrfs_feature_set_names[set];
4725 char *names;
2eaa055f
JM		 4726 u64 disallowed, unsupported;
4727 u64 set_mask = flags & change_mask;
4728 u64 clear_mask = ~flags & change_mask;
4729
4730 unsupported = set_mask & ~supported_flags;
4731 if (unsupported) {
3b02a68a
JM		 4732 names = btrfs_printable_features(set, unsupported);
4733 if (names) {
4734 btrfs_warn(root->fs_info,
4735 "this kernel does not support the %s feature bit%s",
4736 names, strchr(names, ',') ? "s" : "");
4737 kfree(names);
4738 } else
4739 btrfs_warn(root->fs_info,
2eaa055f
JM		 4740 "this kernel does not support %s bits 0x%llx",
4741 type, unsupported);
4742 return -EOPNOTSUPP;
4743 }
4744
4745 disallowed = set_mask & ~safe_set;
4746 if (disallowed) {
3b02a68a
JM		 4747 names = btrfs_printable_features(set, disallowed);
4748 if (names) {
4749 btrfs_warn(root->fs_info,
4750 "can't set the %s feature bit%s while mounted",
4751 names, strchr(names, ',') ? "s" : "");
4752 kfree(names);
4753 } else
4754 btrfs_warn(root->fs_info,
2eaa055f
JM		 4755 "can't set %s bits 0x%llx while mounted",
4756 type, disallowed);
4757 return -EPERM;
4758 }
4759
4760 disallowed = clear_mask & ~safe_clear;
4761 if (disallowed) {
3b02a68a
JM		 4762 names = btrfs_printable_features(set, disallowed);
4763 if (names) {
4764 btrfs_warn(root->fs_info,
4765 "can't clear the %s feature bit%s while mounted",
4766 names, strchr(names, ',') ? "s" : "");
4767 kfree(names);
4768 } else
4769 btrfs_warn(root->fs_info,
2eaa055f
JM		 4770 "can't clear %s bits 0x%llx while mounted",
4771 type, disallowed);
4772 return -EPERM;
4773 }
4774
4775 return 0;
4776}
4777
4778#define check_feature(root, change_mask, flags, mask_base) \
3b02a68a 4779check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
2eaa055f
JM		 4780 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4781 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4782 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4783
4784static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4785{
4786 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4787 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4788 struct btrfs_ioctl_feature_flags flags[2];
4789 struct btrfs_trans_handle *trans;
4790 u64 newflags;
4791 int ret;
4792
4793 if (!capable(CAP_SYS_ADMIN))
4794 return -EPERM;
4795
4796 if (copy_from_user(flags, arg, sizeof(flags)))
4797 return -EFAULT;
4798
4799 /* Nothing to do */
4800 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4801 !flags[0].incompat_flags)
4802 return 0;
4803
4804 ret = check_feature(root, flags[0].compat_flags,
4805 flags[1].compat_flags, COMPAT);
4806 if (ret)
4807 return ret;
4808
4809 ret = check_feature(root, flags[0].compat_ro_flags,
4810 flags[1].compat_ro_flags, COMPAT_RO);
4811 if (ret)
4812 return ret;
4813
4814 ret = check_feature(root, flags[0].incompat_flags,
4815 flags[1].incompat_flags, INCOMPAT);
4816 if (ret)
4817 return ret;
4818
8051aa1a 4819 trans = btrfs_start_transaction(root, 0);
2eaa055f
JM		 4820 if (IS_ERR(trans))
4821 return PTR_ERR(trans);
4822
4823 spin_lock(&root->fs_info->super_lock);
4824 newflags = btrfs_super_compat_flags(super_block);
4825 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4826 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4827 btrfs_set_super_compat_flags(super_block, newflags);
4828
4829 newflags = btrfs_super_compat_ro_flags(super_block);
4830 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4831 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4832 btrfs_set_super_compat_ro_flags(super_block, newflags);
4833
4834 newflags = btrfs_super_incompat_flags(super_block);
4835 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4836 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4837 btrfs_set_super_incompat_flags(super_block, newflags);
4838 spin_unlock(&root->fs_info->super_lock);
4839
d0270aca 4840 return btrfs_commit_transaction(trans, root);
2eaa055f
JM		 4841}
4842
f46b5a66
CH		 4843long btrfs_ioctl(struct file *file, unsigned int
4844 cmd, unsigned long arg)
4845{
496ad9aa 4846 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4bcabaa3 4847 void __user *argp = (void __user *)arg;
f46b5a66
CH		 4848
4849 switch (cmd) {
6cbff00f
CH		 4850 case FS_IOC_GETFLAGS:
4851 return btrfs_ioctl_getflags(file, argp);
4852 case FS_IOC_SETFLAGS:
4853 return btrfs_ioctl_setflags(file, argp);
4854 case FS_IOC_GETVERSION:
4855 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 4856 case FITRIM:
4857 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 4858 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 4859 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 4860 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 4861 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 4862 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 4863 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 4864 case BTRFS_IOC_SUBVOL_CREATE_V2:
4865 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 4866 case BTRFS_IOC_SNAP_DESTROY:
4867 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 4868 case BTRFS_IOC_SUBVOL_GETFLAGS:
4869 return btrfs_ioctl_subvol_getflags(file, argp);
4870 case BTRFS_IOC_SUBVOL_SETFLAGS:
4871 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 4872 case BTRFS_IOC_DEFAULT_SUBVOL:
4873 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 4874 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 4875 return btrfs_ioctl_defrag(file, NULL);
4876 case BTRFS_IOC_DEFRAG_RANGE:
4877 return btrfs_ioctl_defrag(file, argp);
f46b5a66 4878 case BTRFS_IOC_RESIZE:
198605a8 4879 return btrfs_ioctl_resize(file, argp);
f46b5a66 4880 case BTRFS_IOC_ADD_DEV:
4bcabaa3 4881 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 4882 case BTRFS_IOC_RM_DEV:
da24927b 4883 return btrfs_ioctl_rm_dev(file, argp);
475f6387
JS		 4884 case BTRFS_IOC_FS_INFO:
4885 return btrfs_ioctl_fs_info(root, argp);
4886 case BTRFS_IOC_DEV_INFO:
4887 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 4888 case BTRFS_IOC_BALANCE:
9ba1f6e4 4889 return btrfs_ioctl_balance(file, NULL);
f46b5a66 4890 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 4891 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4892 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 4893 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 4894 case BTRFS_IOC_TRANS_START:
4895 return btrfs_ioctl_trans_start(file);
4896 case BTRFS_IOC_TRANS_END:
4897 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 4898 case BTRFS_IOC_TREE_SEARCH:
4899 return btrfs_ioctl_tree_search(file, argp);
4900 case BTRFS_IOC_INO_LOOKUP:
4901 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 4902 case BTRFS_IOC_INO_PATHS:
4903 return btrfs_ioctl_ino_to_path(root, argp);
4904 case BTRFS_IOC_LOGICAL_INO:
4905 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 4906 case BTRFS_IOC_SPACE_INFO:
4907 return btrfs_ioctl_space_info(root, argp);
9b199859
FDBM		 4908 case BTRFS_IOC_SYNC: {
4909 int ret;
4910
6c255e67 4911 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
9b199859
FDBM		 4912 if (ret)
4913 return ret;
4914 ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
4915 return ret;
4916 }
46204592 4917 case BTRFS_IOC_START_SYNC:
9a8c28be 4918 return btrfs_ioctl_start_sync(root, argp);
46204592 4919 case BTRFS_IOC_WAIT_SYNC:
9a8c28be 4920 return btrfs_ioctl_wait_sync(root, argp);
475f6387 4921 case BTRFS_IOC_SCRUB:
b8e95489 4922 return btrfs_ioctl_scrub(file, argp);
475f6387
JS		 4923 case BTRFS_IOC_SCRUB_CANCEL:
4924 return btrfs_ioctl_scrub_cancel(root, argp);
4925 case BTRFS_IOC_SCRUB_PROGRESS:
4926 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 4927 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 4928 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 4929 case BTRFS_IOC_BALANCE_CTL:
4930 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 4931 case BTRFS_IOC_BALANCE_PROGRESS:
4932 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 4933 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4934 return btrfs_ioctl_set_received_subvol(file, argp);
abccd00f
HM		 4935#ifdef CONFIG_64BIT
4936 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4937 return btrfs_ioctl_set_received_subvol_32(file, argp);
4938#endif
31db9f7c
AB		 4939 case BTRFS_IOC_SEND:
4940 return btrfs_ioctl_send(file, argp);
c11d2c23 4941 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 4942 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b 4943 case BTRFS_IOC_QUOTA_CTL:
905b0dda 4944 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 4945 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 4946 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 4947 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 4948 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 4949 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 4950 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 4951 case BTRFS_IOC_QUOTA_RESCAN:
4952 return btrfs_ioctl_quota_rescan(file, argp);
4953 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4954 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 4955 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4956 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd
SB		 4957 case BTRFS_IOC_DEV_REPLACE:
4958 return btrfs_ioctl_dev_replace(root, argp);
867ab667 4959 case BTRFS_IOC_GET_FSLABEL:
4960 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 4961 case BTRFS_IOC_SET_FSLABEL:
4962 return btrfs_ioctl_set_fslabel(file, argp);
416161db
MF		 4963 case BTRFS_IOC_FILE_EXTENT_SAME:
4964 return btrfs_ioctl_file_extent_same(file, argp);
2eaa055f
JM		 4965 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4966 return btrfs_ioctl_get_supported_features(file, argp);
4967 case BTRFS_IOC_GET_FEATURES:
4968 return btrfs_ioctl_get_features(file, argp);
4969 case BTRFS_IOC_SET_FEATURES:
4970 return btrfs_ioctl_set_features(file, argp);
f46b5a66
CH		 4971 }
4972
4973 return -ENOTTY;
4974}
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