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btrfs: balance filter: add limit of processed chunks
[people/arne_f/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;
9a40f122 1475 char *retptr;
f46b5a66
CH		 1476 char *devstr = NULL;
1477 int ret = 0;
f46b5a66
CH		 1478 int mod = 0;
1479
e441d54d
CM		 1480 if (!capable(CAP_SYS_ADMIN))
1481 return -EPERM;
1482
198605a8
MX		 1483 ret = mnt_want_write_file(file);
1484 if (ret)
1485 return ret;
1486
5ac00add
SB		 1487 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1488 1)) {
97547676 1489 mnt_drop_write_file(file);
e57138b3 1490 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1491 }
1492
5ac00add 1493 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 1494 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1495 if (IS_ERR(vol_args)) {
1496 ret = PTR_ERR(vol_args);
1497 goto out;
1498 }
5516e595
MF		 1499
1500 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1501
f46b5a66
CH		 1502 sizestr = vol_args->name;
1503 devstr = strchr(sizestr, ':');
1504 if (devstr) {
1505 char *end;
1506 sizestr = devstr + 1;
1507 *devstr = '\0';
1508 devstr = vol_args->name;
1509 devid = simple_strtoull(devstr, &end, 10);
dfd79829
MX		 1510 if (!devid) {
1511 ret = -EINVAL;
1512 goto out_free;
1513 }
efe120a0 1514 btrfs_info(root->fs_info, "resizing devid %llu", devid);
f46b5a66 1515 }
dba60f3f 1516
aa1b8cd4 1517 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1518 if (!device) {
efe120a0 1519 btrfs_info(root->fs_info, "resizer unable to find device %llu",
c1c9ff7c 1520 devid);
dfd79829 1521 ret = -ENODEV;
c9e9f97b 1522 goto out_free;
f46b5a66 1523 }
dba60f3f
MX		 1524
1525 if (!device->writeable) {
efe120a0
FH		 1526 btrfs_info(root->fs_info,
1527 "resizer unable to apply on readonly device %llu",
c1c9ff7c 1528 devid);
dfd79829 1529 ret = -EPERM;
4e42ae1b
LB		 1530 goto out_free;
1531 }
1532
f46b5a66
CH		 1533 if (!strcmp(sizestr, "max"))
1534 new_size = device->bdev->bd_inode->i_size;
1535 else {
1536 if (sizestr[0] == '-') {
1537 mod = -1;
1538 sizestr++;
1539 } else if (sizestr[0] == '+') {
1540 mod = 1;
1541 sizestr++;
1542 }
9a40f122
GH		 1543 new_size = memparse(sizestr, &retptr);
1544 if (*retptr != '\0' || new_size == 0) {
f46b5a66 1545 ret = -EINVAL;
c9e9f97b 1546 goto out_free;
f46b5a66
CH		 1547 }
1548 }
1549
63a212ab 1550 if (device->is_tgtdev_for_dev_replace) {
dfd79829 1551 ret = -EPERM;
63a212ab
SB		 1552 goto out_free;
1553 }
1554
f46b5a66
CH		 1555 old_size = device->total_bytes;
1556
1557 if (mod < 0) {
1558 if (new_size > old_size) {
1559 ret = -EINVAL;
c9e9f97b 1560 goto out_free;
f46b5a66
CH		 1561 }
1562 new_size = old_size - new_size;
1563 } else if (mod > 0) {
eb8052e0
WF		 1564 if (new_size > ULLONG_MAX - old_size) {
1565 ret = -EINVAL;
1566 goto out_free;
1567 }
f46b5a66
CH		 1568 new_size = old_size + new_size;
1569 }
1570
1571 if (new_size < 256 * 1024 * 1024) {
1572 ret = -EINVAL;
c9e9f97b 1573 goto out_free;
f46b5a66
CH		 1574 }
1575 if (new_size > device->bdev->bd_inode->i_size) {
1576 ret = -EFBIG;
c9e9f97b 1577 goto out_free;
f46b5a66
CH		 1578 }
1579
1580 do_div(new_size, root->sectorsize);
1581 new_size *= root->sectorsize;
1582
efe120a0 1583 printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
c1c9ff7c 1584 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1585
1586 if (new_size > old_size) {
a22285a6 1587 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1588 if (IS_ERR(trans)) {
1589 ret = PTR_ERR(trans);
c9e9f97b 1590 goto out_free;
98d5dc13 1591 }
f46b5a66
CH		 1592 ret = btrfs_grow_device(trans, device, new_size);
1593 btrfs_commit_transaction(trans, root);
ece7d20e 1594 } else if (new_size < old_size) {
f46b5a66 1595 ret = btrfs_shrink_device(device, new_size);
0253f40e 1596 } /* equal, nothing need to do */
f46b5a66 1597
c9e9f97b 1598out_free:
f46b5a66 1599 kfree(vol_args);
c9e9f97b
ID		 1600out:
1601 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 1602 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
18f39c41 1603 mnt_drop_write_file(file);
f46b5a66
CH		 1604 return ret;
1605}
1606
72fd032e 1607static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1608 char *name, unsigned long fd, int subvol,
1609 u64 *transid, bool readonly,
8696c533 1610 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1611{
f46b5a66 1612 int namelen;
3de4586c 1613 int ret = 0;
f46b5a66 1614
a874a63e
LB		 1615 ret = mnt_want_write_file(file);
1616 if (ret)
1617 goto out;
1618
72fd032e
SW		 1619 namelen = strlen(name);
1620 if (strchr(name, '/')) {
f46b5a66 1621 ret = -EINVAL;
a874a63e 1622 goto out_drop_write;
f46b5a66
CH		 1623 }
1624
16780cab
CM		 1625 if (name[0] == '.' &&
1626 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1627 ret = -EEXIST;
a874a63e 1628 goto out_drop_write;
16780cab
CM		 1629 }
1630
3de4586c 1631 if (subvol) {
72fd032e 1632 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1633 NULL, transid, readonly, inherit);
cb8e7090 1634 } else {
2903ff01 1635 struct fd src = fdget(fd);
3de4586c 1636 struct inode *src_inode;
2903ff01 1637 if (!src.file) {
3de4586c 1638 ret = -EINVAL;
a874a63e 1639 goto out_drop_write;
3de4586c
CM		 1640 }
1641
496ad9aa
AV		 1642 src_inode = file_inode(src.file);
1643 if (src_inode->i_sb != file_inode(file)->i_sb) {
efe120a0
FH		 1644 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1645 "Snapshot src from another FS");
23ad5b17 1646 ret = -EXDEV;
d0242061
DS		 1647 } else if (!inode_owner_or_capable(src_inode)) {
1648 /*
1649 * Subvolume creation is not restricted, but snapshots
1650 * are limited to own subvolumes only
1651 */
1652 ret = -EPERM;
ecd18815
AV		 1653 } else {
1654 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1655 BTRFS_I(src_inode)->root,
1656 transid, readonly, inherit);
3de4586c 1657 }
2903ff01 1658 fdput(src);
cb8e7090 1659 }
a874a63e
LB		 1660out_drop_write:
1661 mnt_drop_write_file(file);
f46b5a66 1662out:
72fd032e
SW		 1663 return ret;
1664}
1665
1666static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1667 void __user *arg, int subvol)
72fd032e 1668{
fa0d2b9b 1669 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1670 int ret;
1671
fa0d2b9b
LZ		 1672 vol_args = memdup_user(arg, sizeof(*vol_args));
1673 if (IS_ERR(vol_args))
1674 return PTR_ERR(vol_args);
1675 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1676
fa0d2b9b 1677 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1678 vol_args->fd, subvol,
6f72c7e2 1679 NULL, false, NULL);
fdfb1e4f 1680
fa0d2b9b
LZ		 1681 kfree(vol_args);
1682 return ret;
1683}
fdfb1e4f 1684
fa0d2b9b
LZ		 1685static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1686 void __user *arg, int subvol)
1687{
1688 struct btrfs_ioctl_vol_args_v2 *vol_args;
1689 int ret;
1690 u64 transid = 0;
1691 u64 *ptr = NULL;
b83cc969 1692 bool readonly = false;
6f72c7e2 1693 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1694
fa0d2b9b
LZ		 1695 vol_args = memdup_user(arg, sizeof(*vol_args));
1696 if (IS_ERR(vol_args))
1697 return PTR_ERR(vol_args);
1698 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1699
b83cc969 1700 if (vol_args->flags &
6f72c7e2
AJ		 1701 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1702 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1703 ret = -EOPNOTSUPP;
fa0d2b9b 1704 goto out;
72fd032e 1705 }
fa0d2b9b
LZ		 1706
1707 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1708 ptr = &transid;
b83cc969
LZ		 1709 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1710 readonly = true;
6f72c7e2
AJ		 1711 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1712 if (vol_args->size > PAGE_CACHE_SIZE) {
1713 ret = -EINVAL;
1714 goto out;
1715 }
1716 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1717 if (IS_ERR(inherit)) {
1718 ret = PTR_ERR(inherit);
1719 goto out;
1720 }
1721 }
fa0d2b9b
LZ		 1722
1723 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1724 vol_args->fd, subvol, ptr,
8696c533 1725 readonly, inherit);
fa0d2b9b
LZ		 1726
1727 if (ret == 0 && ptr &&
1728 copy_to_user(arg +
1729 offsetof(struct btrfs_ioctl_vol_args_v2,
1730 transid), ptr, sizeof(*ptr)))
1731 ret = -EFAULT;
fdfb1e4f 1732out:
f46b5a66 1733 kfree(vol_args);
6f72c7e2 1734 kfree(inherit);
f46b5a66
CH		 1735 return ret;
1736}
1737
0caa102d
LZ		 1738static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1739 void __user *arg)
1740{
496ad9aa 1741 struct inode *inode = file_inode(file);
0caa102d
LZ		 1742 struct btrfs_root *root = BTRFS_I(inode)->root;
1743 int ret = 0;
1744 u64 flags = 0;
1745
33345d01 1746 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1747 return -EINVAL;
1748
1749 down_read(&root->fs_info->subvol_sem);
1750 if (btrfs_root_readonly(root))
1751 flags |= BTRFS_SUBVOL_RDONLY;
1752 up_read(&root->fs_info->subvol_sem);
1753
1754 if (copy_to_user(arg, &flags, sizeof(flags)))
1755 ret = -EFAULT;
1756
1757 return ret;
1758}
1759
1760static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1761 void __user *arg)
1762{
496ad9aa 1763 struct inode *inode = file_inode(file);
0caa102d
LZ		 1764 struct btrfs_root *root = BTRFS_I(inode)->root;
1765 struct btrfs_trans_handle *trans;
1766 u64 root_flags;
1767 u64 flags;
1768 int ret = 0;
1769
bd60ea0f
DS		 1770 if (!inode_owner_or_capable(inode))
1771 return -EPERM;
1772
b9ca0664
LB		 1773 ret = mnt_want_write_file(file);
1774 if (ret)
1775 goto out;
0caa102d 1776
b9ca0664
LB		 1777 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1778 ret = -EINVAL;
1779 goto out_drop_write;
1780 }
0caa102d 1781
b9ca0664
LB		 1782 if (copy_from_user(&flags, arg, sizeof(flags))) {
1783 ret = -EFAULT;
1784 goto out_drop_write;
1785 }
0caa102d 1786
b9ca0664
LB		 1787 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1788 ret = -EINVAL;
1789 goto out_drop_write;
1790 }
0caa102d 1791
b9ca0664
LB		 1792 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1793 ret = -EOPNOTSUPP;
1794 goto out_drop_write;
1795 }
0caa102d
LZ		 1796
1797 down_write(&root->fs_info->subvol_sem);
1798
1799 /* nothing to do */
1800 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1801 goto out_drop_sem;
0caa102d
LZ		 1802
1803 root_flags = btrfs_root_flags(&root->root_item);
2c686537 1804 if (flags & BTRFS_SUBVOL_RDONLY) {
0caa102d
LZ		 1805 btrfs_set_root_flags(&root->root_item,
1806 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1807 } else {
1808 /*
1809 * Block RO -> RW transition if this subvolume is involved in
1810 * send
1811 */
1812 spin_lock(&root->root_item_lock);
1813 if (root->send_in_progress == 0) {
1814 btrfs_set_root_flags(&root->root_item,
0caa102d 1815 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1816 spin_unlock(&root->root_item_lock);
1817 } else {
1818 spin_unlock(&root->root_item_lock);
1819 btrfs_warn(root->fs_info,
1820 "Attempt to set subvolume %llu read-write during send",
1821 root->root_key.objectid);
1822 ret = -EPERM;
1823 goto out_drop_sem;
1824 }
1825 }
0caa102d
LZ		 1826
1827 trans = btrfs_start_transaction(root, 1);
1828 if (IS_ERR(trans)) {
1829 ret = PTR_ERR(trans);
1830 goto out_reset;
1831 }
1832
b4dc2b8c 1833 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1834 &root->root_key, &root->root_item);
1835
1836 btrfs_commit_transaction(trans, root);
1837out_reset:
1838 if (ret)
1839 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1840out_drop_sem:
0caa102d 1841 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1842out_drop_write:
1843 mnt_drop_write_file(file);
1844out:
0caa102d
LZ		 1845 return ret;
1846}
1847
76dda93c
YZ		 1848/*
1849 * helper to check if the subvolume references other subvolumes
1850 */
1851static noinline int may_destroy_subvol(struct btrfs_root *root)
1852{
1853 struct btrfs_path *path;
175a2b87 1854 struct btrfs_dir_item *di;
76dda93c 1855 struct btrfs_key key;
175a2b87 1856 u64 dir_id;
76dda93c
YZ		 1857 int ret;
1858
1859 path = btrfs_alloc_path();
1860 if (!path)
1861 return -ENOMEM;
1862
175a2b87
JB		 1863 /* Make sure this root isn't set as the default subvol */
1864 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1865 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1866 dir_id, "default", 7, 0);
1867 if (di && !IS_ERR(di)) {
1868 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1869 if (key.objectid == root->root_key.objectid) {
72de6b53
GS		 1870 ret = -EPERM;
1871 btrfs_err(root->fs_info, "deleting default subvolume "
1872 "%llu is not allowed", key.objectid);
175a2b87
JB		 1873 goto out;
1874 }
1875 btrfs_release_path(path);
1876 }
1877
76dda93c
YZ		 1878 key.objectid = root->root_key.objectid;
1879 key.type = BTRFS_ROOT_REF_KEY;
1880 key.offset = (u64)-1;
1881
1882 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1883 &key, path, 0, 0);
1884 if (ret < 0)
1885 goto out;
1886 BUG_ON(ret == 0);
1887
1888 ret = 0;
1889 if (path->slots[0] > 0) {
1890 path->slots[0]--;
1891 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1892 if (key.objectid == root->root_key.objectid &&
1893 key.type == BTRFS_ROOT_REF_KEY)
1894 ret = -ENOTEMPTY;
1895 }
1896out:
1897 btrfs_free_path(path);
1898 return ret;
1899}
1900
ac8e9819
CM		 1901static noinline int key_in_sk(struct btrfs_key *key,
1902 struct btrfs_ioctl_search_key *sk)
1903{
abc6e134
CM		 1904 struct btrfs_key test;
1905 int ret;
1906
1907 test.objectid = sk->min_objectid;
1908 test.type = sk->min_type;
1909 test.offset = sk->min_offset;
1910
1911 ret = btrfs_comp_cpu_keys(key, &test);
1912 if (ret < 0)
ac8e9819 1913 return 0;
abc6e134
CM		 1914
1915 test.objectid = sk->max_objectid;
1916 test.type = sk->max_type;
1917 test.offset = sk->max_offset;
1918
1919 ret = btrfs_comp_cpu_keys(key, &test);
1920 if (ret > 0)
ac8e9819
CM		 1921 return 0;
1922 return 1;
1923}
1924
1925static noinline int copy_to_sk(struct btrfs_root *root,
1926 struct btrfs_path *path,
1927 struct btrfs_key *key,
1928 struct btrfs_ioctl_search_key *sk,
1929 char *buf,
1930 unsigned long *sk_offset,
1931 int *num_found)
1932{
1933 u64 found_transid;
1934 struct extent_buffer *leaf;
1935 struct btrfs_ioctl_search_header sh;
1936 unsigned long item_off;
1937 unsigned long item_len;
1938 int nritems;
1939 int i;
1940 int slot;
ac8e9819
CM		 1941 int ret = 0;
1942
1943 leaf = path->nodes[0];
1944 slot = path->slots[0];
1945 nritems = btrfs_header_nritems(leaf);
1946
1947 if (btrfs_header_generation(leaf) > sk->max_transid) {
1948 i = nritems;
1949 goto advance_key;
1950 }
1951 found_transid = btrfs_header_generation(leaf);
1952
1953 for (i = slot; i < nritems; i++) {
1954 item_off = btrfs_item_ptr_offset(leaf, i);
1955 item_len = btrfs_item_size_nr(leaf, i);
1956
03b71c6c
GP		 1957 btrfs_item_key_to_cpu(leaf, key, i);
1958 if (!key_in_sk(key, sk))
1959 continue;
1960
1961 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
ac8e9819
CM		 1962 item_len = 0;
1963
1964 if (sizeof(sh) + item_len + *sk_offset >
1965 BTRFS_SEARCH_ARGS_BUFSIZE) {
1966 ret = 1;
1967 goto overflow;
1968 }
1969
ac8e9819
CM		 1970 sh.objectid = key->objectid;
1971 sh.offset = key->offset;
1972 sh.type = key->type;
1973 sh.len = item_len;
1974 sh.transid = found_transid;
1975
1976 /* copy search result header */
1977 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1978 *sk_offset += sizeof(sh);
1979
1980 if (item_len) {
1981 char *p = buf + *sk_offset;
1982 /* copy the item */
1983 read_extent_buffer(leaf, p,
1984 item_off, item_len);
1985 *sk_offset += item_len;
ac8e9819 1986 }
e2156867 1987 (*num_found)++;
ac8e9819
CM		 1988
1989 if (*num_found >= sk->nr_items)
1990 break;
1991 }
1992advance_key:
abc6e134
CM		 1993 ret = 0;
1994 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1995 key->offset++;
abc6e134
CM		 1996 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1997 key->offset = 0;
ac8e9819 1998 key->type++;
abc6e134
CM		 1999 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
2000 key->offset = 0;
2001 key->type = 0;
ac8e9819 2002 key->objectid++;
abc6e134
CM		 2003 } else
2004 ret = 1;
ac8e9819 2005overflow:
ac8e9819
CM		 2006 return ret;
2007}
2008
2009static noinline int search_ioctl(struct inode *inode,
2010 struct btrfs_ioctl_search_args *args)
2011{
2012 struct btrfs_root *root;
2013 struct btrfs_key key;
ac8e9819
CM		 2014 struct btrfs_path *path;
2015 struct btrfs_ioctl_search_key *sk = &args->key;
2016 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2017 int ret;
2018 int num_found = 0;
2019 unsigned long sk_offset = 0;
2020
2021 path = btrfs_alloc_path();
2022 if (!path)
2023 return -ENOMEM;
2024
2025 if (sk->tree_id == 0) {
2026 /* search the root of the inode that was passed */
2027 root = BTRFS_I(inode)->root;
2028 } else {
2029 key.objectid = sk->tree_id;
2030 key.type = BTRFS_ROOT_ITEM_KEY;
2031 key.offset = (u64)-1;
2032 root = btrfs_read_fs_root_no_name(info, &key);
2033 if (IS_ERR(root)) {
efe120a0 2034 printk(KERN_ERR "BTRFS: could not find root %llu\n",
ac8e9819
CM		 2035 sk->tree_id);
2036 btrfs_free_path(path);
2037 return -ENOENT;
2038 }
2039 }
2040
2041 key.objectid = sk->min_objectid;
2042 key.type = sk->min_type;
2043 key.offset = sk->min_offset;
2044
ac8e9819
CM		 2045 path->keep_locks = 1;
2046
67871254 2047 while (1) {
6174d3cb 2048 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
ac8e9819
CM		 2049 if (ret != 0) {
2050 if (ret > 0)
2051 ret = 0;
2052 goto err;
2053 }
2054 ret = copy_to_sk(root, path, &key, sk, args->buf,
2055 &sk_offset, &num_found);
b3b4aa74 2056 btrfs_release_path(path);
ac8e9819
CM		 2057 if (ret || num_found >= sk->nr_items)
2058 break;
2059
2060 }
2061 ret = 0;
2062err:
2063 sk->nr_items = num_found;
2064 btrfs_free_path(path);
2065 return ret;
2066}
2067
2068static noinline int btrfs_ioctl_tree_search(struct file *file,
2069 void __user *argp)
2070{
2071 struct btrfs_ioctl_search_args *args;
2072 struct inode *inode;
2073 int ret;
2074
2075 if (!capable(CAP_SYS_ADMIN))
2076 return -EPERM;
2077
2354d08f
JL		 2078 args = memdup_user(argp, sizeof(*args));
2079 if (IS_ERR(args))
2080 return PTR_ERR(args);
ac8e9819 2081
496ad9aa 2082 inode = file_inode(file);
ac8e9819
CM		 2083 ret = search_ioctl(inode, args);
2084 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2085 ret = -EFAULT;
2086 kfree(args);
2087 return ret;
2088}
2089
98d377a0 2090/*
ac8e9819
CM		 2091 * Search INODE_REFs to identify path name of 'dirid' directory
2092 * in a 'tree_id' tree. and sets path name to 'name'.
2093 */
98d377a0
TH		 2094static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2095 u64 tree_id, u64 dirid, char *name)
2096{
2097 struct btrfs_root *root;
2098 struct btrfs_key key;
ac8e9819 2099 char *ptr;
98d377a0
TH		 2100 int ret = -1;
2101 int slot;
2102 int len;
2103 int total_len = 0;
2104 struct btrfs_inode_ref *iref;
2105 struct extent_buffer *l;
2106 struct btrfs_path *path;
2107
2108 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2109 name[0]='\0';
2110 return 0;
2111 }
2112
2113 path = btrfs_alloc_path();
2114 if (!path)
2115 return -ENOMEM;
2116
ac8e9819 2117 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 2118
2119 key.objectid = tree_id;
2120 key.type = BTRFS_ROOT_ITEM_KEY;
2121 key.offset = (u64)-1;
2122 root = btrfs_read_fs_root_no_name(info, &key);
2123 if (IS_ERR(root)) {
efe120a0 2124 printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
8ad6fcab
CM		 2125 ret = -ENOENT;
2126 goto out;
98d377a0
TH		 2127 }
2128
2129 key.objectid = dirid;
2130 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2131 key.offset = (u64)-1;
98d377a0 2132
67871254 2133 while (1) {
98d377a0
TH		 2134 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2135 if (ret < 0)
2136 goto out;
18674c6c
FDBM		 2137 else if (ret > 0) {
2138 ret = btrfs_previous_item(root, path, dirid,
2139 BTRFS_INODE_REF_KEY);
2140 if (ret < 0)
2141 goto out;
2142 else if (ret > 0) {
2143 ret = -ENOENT;
2144 goto out;
2145 }
2146 }
98d377a0
TH		 2147
2148 l = path->nodes[0];
2149 slot = path->slots[0];
2150 btrfs_item_key_to_cpu(l, &key, slot);
2151
98d377a0
TH		 2152 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2153 len = btrfs_inode_ref_name_len(l, iref);
2154 ptr -= len + 1;
2155 total_len += len + 1;
a696cf35
FDBM		 2156 if (ptr < name) {
2157 ret = -ENAMETOOLONG;
98d377a0 2158 goto out;
a696cf35 2159 }
98d377a0
TH		 2160
2161 *(ptr + len) = '/';
67871254 2162 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
98d377a0
TH		 2163
2164 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2165 break;
2166
b3b4aa74 2167 btrfs_release_path(path);
98d377a0 2168 key.objectid = key.offset;
8ad6fcab 2169 key.offset = (u64)-1;
98d377a0 2170 dirid = key.objectid;
98d377a0 2171 }
77906a50 2172 memmove(name, ptr, total_len);
67871254 2173 name[total_len] = '\0';
98d377a0
TH		 2174 ret = 0;
2175out:
2176 btrfs_free_path(path);
ac8e9819
CM		 2177 return ret;
2178}
2179
2180static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2181 void __user *argp)
2182{
2183 struct btrfs_ioctl_ino_lookup_args *args;
2184 struct inode *inode;
2185 int ret;
2186
2187 if (!capable(CAP_SYS_ADMIN))
2188 return -EPERM;
2189
2354d08f
JL		 2190 args = memdup_user(argp, sizeof(*args));
2191 if (IS_ERR(args))
2192 return PTR_ERR(args);
c2b96929 2193
496ad9aa 2194 inode = file_inode(file);
ac8e9819 2195
1b53ac4d
CM		 2196 if (args->treeid == 0)
2197 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2198
ac8e9819
CM		 2199 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2200 args->treeid, args->objectid,
2201 args->name);
2202
2203 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2204 ret = -EFAULT;
2205
2206 kfree(args);
98d377a0
TH		 2207 return ret;
2208}
2209
76dda93c
YZ		 2210static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2211 void __user *arg)
2212{
54563d41 2213 struct dentry *parent = file->f_path.dentry;
76dda93c
YZ		 2214 struct dentry *dentry;
2215 struct inode *dir = parent->d_inode;
2216 struct inode *inode;
2217 struct btrfs_root *root = BTRFS_I(dir)->root;
2218 struct btrfs_root *dest = NULL;
2219 struct btrfs_ioctl_vol_args *vol_args;
2220 struct btrfs_trans_handle *trans;
c58aaad2
MX		 2221 struct btrfs_block_rsv block_rsv;
2222 u64 qgroup_reserved;
76dda93c
YZ		 2223 int namelen;
2224 int ret;
2225 int err = 0;
2226
76dda93c
YZ		 2227 vol_args = memdup_user(arg, sizeof(*vol_args));
2228 if (IS_ERR(vol_args))
2229 return PTR_ERR(vol_args);
2230
2231 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2232 namelen = strlen(vol_args->name);
2233 if (strchr(vol_args->name, '/') ||
2234 strncmp(vol_args->name, "..", namelen) == 0) {
2235 err = -EINVAL;
2236 goto out;
2237 }
2238
a561be71 2239 err = mnt_want_write_file(file);
76dda93c
YZ		 2240 if (err)
2241 goto out;
2242
5c50c9b8
DS		 2243 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2244 if (err == -EINTR)
e43f998e 2245 goto out_drop_write;
76dda93c
YZ		 2246 dentry = lookup_one_len(vol_args->name, parent, namelen);
2247 if (IS_ERR(dentry)) {
2248 err = PTR_ERR(dentry);
2249 goto out_unlock_dir;
2250 }
2251
2252 if (!dentry->d_inode) {
2253 err = -ENOENT;
2254 goto out_dput;
2255 }
2256
2257 inode = dentry->d_inode;
4260f7c7 2258 dest = BTRFS_I(inode)->root;
67871254 2259 if (!capable(CAP_SYS_ADMIN)) {
4260f7c7
SW		 2260 /*
2261 * Regular user. Only allow this with a special mount
2262 * option, when the user has write+exec access to the
2263 * subvol root, and when rmdir(2) would have been
2264 * allowed.
2265 *
2266 * Note that this is _not_ check that the subvol is
2267 * empty or doesn't contain data that we wouldn't
2268 * otherwise be able to delete.
2269 *
2270 * Users who want to delete empty subvols should try
2271 * rmdir(2).
2272 */
2273 err = -EPERM;
2274 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2275 goto out_dput;
2276
2277 /*
2278 * Do not allow deletion if the parent dir is the same
2279 * as the dir to be deleted. That means the ioctl
2280 * must be called on the dentry referencing the root
2281 * of the subvol, not a random directory contained
2282 * within it.
2283 */
2284 err = -EINVAL;
2285 if (root == dest)
2286 goto out_dput;
2287
2288 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2289 if (err)
2290 goto out_dput;
4260f7c7
SW		 2291 }
2292
5c39da5b
MX		 2293 /* check if subvolume may be deleted by a user */
2294 err = btrfs_may_delete(dir, dentry, 1);
2295 if (err)
2296 goto out_dput;
2297
33345d01 2298 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2299 err = -EINVAL;
2300 goto out_dput;
2301 }
2302
76dda93c
YZ		 2303 mutex_lock(&inode->i_mutex);
2304 err = d_invalidate(dentry);
2305 if (err)
2306 goto out_unlock;
2307
2308 down_write(&root->fs_info->subvol_sem);
2309
2310 err = may_destroy_subvol(dest);
2311 if (err)
2312 goto out_up_write;
2313
c58aaad2
MX		 2314 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2315 /*
2316 * One for dir inode, two for dir entries, two for root
2317 * ref/backref.
2318 */
2319 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
ee3441b4 2320 5, &qgroup_reserved, true);
c58aaad2
MX		 2321 if (err)
2322 goto out_up_write;
2323
a22285a6
YZ		 2324 trans = btrfs_start_transaction(root, 0);
2325 if (IS_ERR(trans)) {
2326 err = PTR_ERR(trans);
c58aaad2 2327 goto out_release;
a22285a6 2328 }
c58aaad2
MX		 2329 trans->block_rsv = &block_rsv;
2330 trans->bytes_reserved = block_rsv.size;
a22285a6 2331
76dda93c
YZ		 2332 ret = btrfs_unlink_subvol(trans, root, dir,
2333 dest->root_key.objectid,
2334 dentry->d_name.name,
2335 dentry->d_name.len);
79787eaa
JM		 2336 if (ret) {
2337 err = ret;
2338 btrfs_abort_transaction(trans, root, ret);
2339 goto out_end_trans;
2340 }
76dda93c
YZ		 2341
2342 btrfs_record_root_in_trans(trans, dest);
2343
2344 memset(&dest->root_item.drop_progress, 0,
2345 sizeof(dest->root_item.drop_progress));
2346 dest->root_item.drop_level = 0;
2347 btrfs_set_root_refs(&dest->root_item, 0);
2348
d68fc57b
YZ		 2349 if (!xchg(&dest->orphan_item_inserted, 1)) {
2350 ret = btrfs_insert_orphan_item(trans,
2351 root->fs_info->tree_root,
2352 dest->root_key.objectid);
79787eaa
JM		 2353 if (ret) {
2354 btrfs_abort_transaction(trans, root, ret);
2355 err = ret;
2356 goto out_end_trans;
2357 }
d68fc57b 2358 }
dd5f9615
SB		 2359
2360 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2361 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2362 dest->root_key.objectid);
2363 if (ret && ret != -ENOENT) {
2364 btrfs_abort_transaction(trans, root, ret);
2365 err = ret;
2366 goto out_end_trans;
2367 }
2368 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2369 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2370 dest->root_item.received_uuid,
2371 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2372 dest->root_key.objectid);
2373 if (ret && ret != -ENOENT) {
2374 btrfs_abort_transaction(trans, root, ret);
2375 err = ret;
2376 goto out_end_trans;
2377 }
2378 }
2379
79787eaa 2380out_end_trans:
c58aaad2
MX		 2381 trans->block_rsv = NULL;
2382 trans->bytes_reserved = 0;
531cb13f 2383 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2384 if (ret && !err)
2385 err = ret;
76dda93c 2386 inode->i_flags |= S_DEAD;
c58aaad2
MX		 2387out_release:
2388 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
76dda93c
YZ		 2389out_up_write:
2390 up_write(&root->fs_info->subvol_sem);
2391out_unlock:
2392 mutex_unlock(&inode->i_mutex);
2393 if (!err) {
efefb143 2394 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2395 btrfs_invalidate_inodes(dest);
2396 d_delete(dentry);
fa6ac876
LB		 2397
2398 /* the last ref */
2399 if (dest->cache_inode) {
2400 iput(dest->cache_inode);
2401 dest->cache_inode = NULL;
2402 }
76dda93c
YZ		 2403 }
2404out_dput:
2405 dput(dentry);
2406out_unlock_dir:
2407 mutex_unlock(&dir->i_mutex);
e43f998e 2408out_drop_write:
2a79f17e 2409 mnt_drop_write_file(file);
76dda93c
YZ		 2410out:
2411 kfree(vol_args);
2412 return err;
2413}
2414
1e701a32 2415static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2416{
496ad9aa 2417 struct inode *inode = file_inode(file);
f46b5a66 2418 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2419 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2420 int ret;
2421
25122d15
ID		 2422 ret = mnt_want_write_file(file);
2423 if (ret)
2424 return ret;
b83cc969 2425
25122d15
ID		 2426 if (btrfs_root_readonly(root)) {
2427 ret = -EROFS;
2428 goto out;
5ac00add 2429 }
f46b5a66
CH		 2430
2431 switch (inode->i_mode & S_IFMT) {
2432 case S_IFDIR:
e441d54d
CM		 2433 if (!capable(CAP_SYS_ADMIN)) {
2434 ret = -EPERM;
2435 goto out;
2436 }
de78b51a 2437 ret = btrfs_defrag_root(root);
8929ecfa
YZ		 2438 if (ret)
2439 goto out;
de78b51a 2440 ret = btrfs_defrag_root(root->fs_info->extent_root);
f46b5a66
CH		 2441 break;
2442 case S_IFREG:
e441d54d
CM		 2443 if (!(file->f_mode & FMODE_WRITE)) {
2444 ret = -EINVAL;
2445 goto out;
2446 }
1e701a32
CM		 2447
2448 range = kzalloc(sizeof(*range), GFP_KERNEL);
2449 if (!range) {
2450 ret = -ENOMEM;
2451 goto out;
2452 }
2453
2454 if (argp) {
2455 if (copy_from_user(range, argp,
2456 sizeof(*range))) {
2457 ret = -EFAULT;
2458 kfree(range);
683be16e 2459 goto out;
1e701a32
CM		 2460 }
2461 /* compression requires us to start the IO */
2462 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2463 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2464 range->extent_thresh = (u32)-1;
2465 }
2466 } else {
2467 /* the rest are all set to zero by kzalloc */
2468 range->len = (u64)-1;
2469 }
496ad9aa 2470 ret = btrfs_defrag_file(file_inode(file), file,
4cb5300b
CM		 2471 range, 0, 0);
2472 if (ret > 0)
2473 ret = 0;
1e701a32 2474 kfree(range);
f46b5a66 2475 break;
8929ecfa
YZ		 2476 default:
2477 ret = -EINVAL;
f46b5a66 2478 }
e441d54d 2479out:
25122d15 2480 mnt_drop_write_file(file);
e441d54d 2481 return ret;
f46b5a66
CH		 2482}
2483
b2950863 2484static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2485{
2486 struct btrfs_ioctl_vol_args *vol_args;
2487 int ret;
2488
e441d54d
CM		 2489 if (!capable(CAP_SYS_ADMIN))
2490 return -EPERM;
2491
5ac00add
SB		 2492 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2493 1)) {
e57138b3 2494 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 2495 }
2496
5ac00add 2497 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2498 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2499 if (IS_ERR(vol_args)) {
2500 ret = PTR_ERR(vol_args);
2501 goto out;
2502 }
f46b5a66 2503
5516e595 2504 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2505 ret = btrfs_init_new_device(root, vol_args->name);
2506
f46b5a66 2507 kfree(vol_args);
c9e9f97b
ID		 2508out:
2509 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2510 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
f46b5a66
CH		 2511 return ret;
2512}
2513
da24927b 2514static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 2515{
496ad9aa 2516 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 2517 struct btrfs_ioctl_vol_args *vol_args;
2518 int ret;
2519
e441d54d
CM		 2520 if (!capable(CAP_SYS_ADMIN))
2521 return -EPERM;
2522
da24927b
MX		 2523 ret = mnt_want_write_file(file);
2524 if (ret)
2525 return ret;
c146afad 2526
dae7b665 2527 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2528 if (IS_ERR(vol_args)) {
2529 ret = PTR_ERR(vol_args);
2530 goto out;
2531 }
f46b5a66 2532
5516e595 2533 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 2534
183860f6
AJ		 2535 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2536 1)) {
2537 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2538 goto out;
2539 }
2540
2541 mutex_lock(&root->fs_info->volume_mutex);
2542 ret = btrfs_rm_device(root, vol_args->name);
c9e9f97b 2543 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2544 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
183860f6
AJ		 2545
2546out:
2547 kfree(vol_args);
4ac20c70 2548 mnt_drop_write_file(file);
f46b5a66
CH		 2549 return ret;
2550}
2551
475f6387
JS		 2552static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2553{
027ed2f0 2554 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2555 struct btrfs_device *device;
2556 struct btrfs_device *next;
2557 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2558 int ret = 0;
475f6387
JS		 2559
2560 if (!capable(CAP_SYS_ADMIN))
2561 return -EPERM;
2562
027ed2f0
LZ		 2563 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2564 if (!fi_args)
2565 return -ENOMEM;
2566
f7171750 2567 mutex_lock(&fs_devices->device_list_mutex);
027ed2f0
LZ		 2568 fi_args->num_devices = fs_devices->num_devices;
2569 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387 2570
475f6387 2571 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2572 if (device->devid > fi_args->max_id)
2573 fi_args->max_id = device->devid;
475f6387
JS		 2574 }
2575 mutex_unlock(&fs_devices->device_list_mutex);
2576
027ed2f0
LZ		 2577 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2578 ret = -EFAULT;
475f6387 2579
027ed2f0
LZ		 2580 kfree(fi_args);
2581 return ret;
475f6387
JS		 2582}
2583
2584static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2585{
2586 struct btrfs_ioctl_dev_info_args *di_args;
2587 struct btrfs_device *dev;
2588 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2589 int ret = 0;
2590 char *s_uuid = NULL;
475f6387
JS		 2591
2592 if (!capable(CAP_SYS_ADMIN))
2593 return -EPERM;
2594
2595 di_args = memdup_user(arg, sizeof(*di_args));
2596 if (IS_ERR(di_args))
2597 return PTR_ERR(di_args);
2598
dd5f9615 2599 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 2600 s_uuid = di_args->uuid;
2601
2602 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2603 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2604
2605 if (!dev) {
2606 ret = -ENODEV;
2607 goto out;
2608 }
2609
2610 di_args->devid = dev->devid;
2611 di_args->bytes_used = dev->bytes_used;
2612 di_args->total_bytes = dev->total_bytes;
2613 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2614 if (dev->name) {
606686ee
JB		 2615 struct rcu_string *name;
2616
2617 rcu_read_lock();
2618 name = rcu_dereference(dev->name);
2619 strncpy(di_args->path, name->str, sizeof(di_args->path));
2620 rcu_read_unlock();
a27202fb
JM		 2621 di_args->path[sizeof(di_args->path) - 1] = 0;
2622 } else {
99ba55ad 2623 di_args->path[0] = '\0';
a27202fb 2624 }
475f6387
JS		 2625
2626out:
55793c0d 2627 mutex_unlock(&fs_devices->device_list_mutex);
475f6387
JS		 2628 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2629 ret = -EFAULT;
2630
2631 kfree(di_args);
2632 return ret;
2633}
2634
416161db
MF		 2635static struct page *extent_same_get_page(struct inode *inode, u64 off)
2636{
2637 struct page *page;
2638 pgoff_t index;
2639 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2640
2641 index = off >> PAGE_CACHE_SHIFT;
2642
2643 page = grab_cache_page(inode->i_mapping, index);
2644 if (!page)
2645 return NULL;
2646
2647 if (!PageUptodate(page)) {
2648 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2649 0))
2650 return NULL;
2651 lock_page(page);
2652 if (!PageUptodate(page)) {
2653 unlock_page(page);
2654 page_cache_release(page);
2655 return NULL;
2656 }
2657 }
2658 unlock_page(page);
2659
2660 return page;
2661}
2662
77fe20dc
MF		 2663static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2664{
2665 /* do any pending delalloc/csum calc on src, one way or
2666 another, and lock file content */
2667 while (1) {
2668 struct btrfs_ordered_extent *ordered;
2669 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2670 ordered = btrfs_lookup_first_ordered_extent(inode,
2671 off + len - 1);
2672 if (!ordered &&
2673 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2674 off + len - 1, EXTENT_DELALLOC, 0, NULL))
2675 break;
2676 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2677 if (ordered)
2678 btrfs_put_ordered_extent(ordered);
2679 btrfs_wait_ordered_range(inode, off, len);
2680 }
2681}
2682
416161db
MF		 2683static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2684 struct inode *inode2, u64 loff2, u64 len)
2685{
2686 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2687 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2688
2689 mutex_unlock(&inode1->i_mutex);
2690 mutex_unlock(&inode2->i_mutex);
2691}
2692
2693static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2694 struct inode *inode2, u64 loff2, u64 len)
2695{
2696 if (inode1 < inode2) {
2697 swap(inode1, inode2);
2698 swap(loff1, loff2);
2699 }
2700
2701 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2702 lock_extent_range(inode1, loff1, len);
2703 if (inode1 != inode2) {
2704 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2705 lock_extent_range(inode2, loff2, len);
2706 }
2707}
2708
2709static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2710 u64 dst_loff, u64 len)
2711{
2712 int ret = 0;
2713 struct page *src_page, *dst_page;
2714 unsigned int cmp_len = PAGE_CACHE_SIZE;
2715 void *addr, *dst_addr;
2716
2717 while (len) {
2718 if (len < PAGE_CACHE_SIZE)
2719 cmp_len = len;
2720
2721 src_page = extent_same_get_page(src, loff);
2722 if (!src_page)
2723 return -EINVAL;
2724 dst_page = extent_same_get_page(dst, dst_loff);
2725 if (!dst_page) {
2726 page_cache_release(src_page);
2727 return -EINVAL;
2728 }
2729 addr = kmap_atomic(src_page);
2730 dst_addr = kmap_atomic(dst_page);
2731
2732 flush_dcache_page(src_page);
2733 flush_dcache_page(dst_page);
2734
2735 if (memcmp(addr, dst_addr, cmp_len))
2736 ret = BTRFS_SAME_DATA_DIFFERS;
2737
2738 kunmap_atomic(addr);
2739 kunmap_atomic(dst_addr);
2740 page_cache_release(src_page);
2741 page_cache_release(dst_page);
2742
2743 if (ret)
2744 break;
2745
2746 loff += cmp_len;
2747 dst_loff += cmp_len;
2748 len -= cmp_len;
2749 }
2750
2751 return ret;
2752}
2753
2754static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2755{
2756 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2757
2758 if (off + len > inode->i_size || off + len < off)
2759 return -EINVAL;
2760 /* Check that we are block aligned - btrfs_clone() requires this */
2761 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2762 return -EINVAL;
2763
2764 return 0;
2765}
2766
2767static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2768 struct inode *dst, u64 dst_loff)
2769{
2770 int ret;
2771
2772 /*
2773 * btrfs_clone() can't handle extents in the same file
2774 * yet. Once that works, we can drop this check and replace it
2775 * with a check for the same inode, but overlapping extents.
2776 */
2777 if (src == dst)
2778 return -EINVAL;
2779
2780 btrfs_double_lock(src, loff, dst, dst_loff, len);
2781
2782 ret = extent_same_check_offsets(src, loff, len);
2783 if (ret)
2784 goto out_unlock;
2785
2786 ret = extent_same_check_offsets(dst, dst_loff, len);
2787 if (ret)
2788 goto out_unlock;
2789
2790 /* don't make the dst file partly checksummed */
2791 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2792 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2793 ret = -EINVAL;
2794 goto out_unlock;
2795 }
2796
2797 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2798 if (ret == 0)
2799 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2800
2801out_unlock:
2802 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2803
2804 return ret;
2805}
2806
2807#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2808
2809static long btrfs_ioctl_file_extent_same(struct file *file,
1c1c8747 2810 struct btrfs_ioctl_same_args __user *argp)
416161db 2811{
cbf8b8ca
MF		 2812 struct btrfs_ioctl_same_args *same;
2813 struct btrfs_ioctl_same_extent_info *info;
1c1c8747 2814 struct inode *src = file_inode(file);
416161db
MF		 2815 u64 off;
2816 u64 len;
2817 int i;
2818 int ret;
cbf8b8ca 2819 unsigned long size;
416161db
MF		 2820 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2821 bool is_admin = capable(CAP_SYS_ADMIN);
1c1c8747 2822 u16 count;
416161db
MF		 2823
2824 if (!(file->f_mode & FMODE_READ))
2825 return -EINVAL;
2826
2827 ret = mnt_want_write_file(file);
2828 if (ret)
2829 return ret;
2830
1c1c8747 2831 if (get_user(count, &argp->dest_count)) {
416161db
MF		 2832 ret = -EFAULT;
2833 goto out;
2834 }
2835
1c1c8747 2836 size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
cbf8b8ca 2837
1c1c8747 2838 same = memdup_user(argp, size);
cbf8b8ca 2839
229eed43
GB		 2840 if (IS_ERR(same)) {
2841 ret = PTR_ERR(same);
cbf8b8ca
MF		 2842 goto out;
2843 }
2844
2845 off = same->logical_offset;
2846 len = same->length;
416161db
MF		 2847
2848 /*
2849 * Limit the total length we will dedupe for each operation.
2850 * This is intended to bound the total time spent in this
2851 * ioctl to something sane.
2852 */
2853 if (len > BTRFS_MAX_DEDUPE_LEN)
2854 len = BTRFS_MAX_DEDUPE_LEN;
2855
2856 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2857 /*
2858 * Btrfs does not support blocksize < page_size. As a
2859 * result, btrfs_cmp_data() won't correctly handle
2860 * this situation without an update.
2861 */
2862 ret = -EINVAL;
2863 goto out;
2864 }
2865
2866 ret = -EISDIR;
2867 if (S_ISDIR(src->i_mode))
2868 goto out;
2869
2870 ret = -EACCES;
2871 if (!S_ISREG(src->i_mode))
2872 goto out;
2873
cbf8b8ca 2874 /* pre-format output fields to sane values */
1c1c8747 2875 for (i = 0; i < count; i++) {
cbf8b8ca
MF		 2876 same->info[i].bytes_deduped = 0ULL;
2877 same->info[i].status = 0;
2878 }
416161db 2879
1c1c8747
AV		 2880 for (i = 0, info = same->info; i < count; i++, info++) {
2881 struct inode *dst;
2882 struct fd dst_file = fdget(info->fd);
2883 if (!dst_file.file) {
cbf8b8ca 2884 info->status = -EBADF;
1c1c8747 2885 continue;
416161db 2886 }
1c1c8747 2887 dst = file_inode(dst_file.file);
416161db 2888
1c1c8747 2889 if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
cbf8b8ca 2890 info->status = -EINVAL;
1c1c8747
AV		 2891 } else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
2892 info->status = -EXDEV;
2893 } else if (S_ISDIR(dst->i_mode)) {
cbf8b8ca 2894 info->status = -EISDIR;
1c1c8747 2895 } else if (!S_ISREG(dst->i_mode)) {
cbf8b8ca 2896 info->status = -EACCES;
1c1c8747
AV		 2897 } else {
2898 info->status = btrfs_extent_same(src, off, len, dst,
2899 info->logical_offset);
2900 if (info->status == 0)
2901 info->bytes_deduped += len;
416161db 2902 }
1c1c8747 2903 fdput(dst_file);
416161db
MF		 2904 }
2905
cbf8b8ca
MF		 2906 ret = copy_to_user(argp, same, size);
2907 if (ret)
2908 ret = -EFAULT;
2909
416161db
MF		 2910out:
2911 mnt_drop_write_file(file);
2912 return ret;
2913}
2914
32b7c687
MF		 2915/**
2916 * btrfs_clone() - clone a range from inode file to another
2917 *
2918 * @src: Inode to clone from
2919 * @inode: Inode to clone to
2920 * @off: Offset within source to start clone from
2921 * @olen: Original length, passed by user, of range to clone
2922 * @olen_aligned: Block-aligned value of olen, extent_same uses
2923 * identical values here
2924 * @destoff: Offset within @inode to start clone
2925 */
2926static int btrfs_clone(struct inode *src, struct inode *inode,
2927 u64 off, u64 olen, u64 olen_aligned, u64 destoff)
f46b5a66 2928{
f46b5a66 2929 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 2930 struct btrfs_path *path = NULL;
f46b5a66 2931 struct extent_buffer *leaf;
32b7c687
MF		 2932 struct btrfs_trans_handle *trans;
2933 char *buf = NULL;
ae01a0ab 2934 struct btrfs_key key;
f46b5a66
CH		 2935 u32 nritems;
2936 int slot;
ae01a0ab 2937 int ret;
32b7c687 2938 u64 len = olen_aligned;
ae01a0ab
YZ		 2939
2940 ret = -ENOMEM;
2941 buf = vmalloc(btrfs_level_size(root, 0));
2942 if (!buf)
32b7c687 2943 return ret;
ae01a0ab
YZ		 2944
2945 path = btrfs_alloc_path();
2946 if (!path) {
2947 vfree(buf);
32b7c687 2948 return ret;
d525e8ab
LZ		 2949 }
2950
32b7c687 2951 path->reada = 2;
c5c9cd4d 2952 /* clone data */
33345d01 2953 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2954 key.type = BTRFS_EXTENT_DATA_KEY;
2955 key.offset = 0;
f46b5a66
CH		 2956
2957 while (1) {
2958 /*
2959 * note the key will change type as we walk through the
2960 * tree.
2961 */
e4355f34 2962 path->leave_spinning = 1;
362a20c5
DS		 2963 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2964 0, 0);
f46b5a66
CH		 2965 if (ret < 0)
2966 goto out;
2967
ae01a0ab 2968 nritems = btrfs_header_nritems(path->nodes[0]);
e4355f34 2969process_slot:
ae01a0ab 2970 if (path->slots[0] >= nritems) {
362a20c5 2971 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2972 if (ret < 0)
2973 goto out;
2974 if (ret > 0)
2975 break;
ae01a0ab 2976 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2977 }
2978 leaf = path->nodes[0];
2979 slot = path->slots[0];
f46b5a66 2980
ae01a0ab 2981 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 2982 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 2983 key.objectid != btrfs_ino(src))
f46b5a66
CH		 2984 break;
2985
c5c9cd4d
SW		 2986 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2987 struct btrfs_file_extent_item *extent;
2988 int type;
31840ae1
ZY		 2989 u32 size;
2990 struct btrfs_key new_key;
c5c9cd4d
SW		 2991 u64 disko = 0, diskl = 0;
2992 u64 datao = 0, datal = 0;
2993 u8 comp;
b5384d48 2994 u64 endoff;
31840ae1 2995
c5c9cd4d
SW		 2996 extent = btrfs_item_ptr(leaf, slot,
2997 struct btrfs_file_extent_item);
2998 comp = btrfs_file_extent_compression(leaf, extent);
2999 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 3000 if (type == BTRFS_FILE_EXTENT_REG ||
3001 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 3002 disko = btrfs_file_extent_disk_bytenr(leaf,
3003 extent);
3004 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3005 extent);
c5c9cd4d 3006 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 3007 datal = btrfs_file_extent_num_bytes(leaf,
3008 extent);
c5c9cd4d
SW		 3009 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3010 /* take upper bound, may be compressed */
3011 datal = btrfs_file_extent_ram_bytes(leaf,
3012 extent);
3013 }
31840ae1 3014
050006a7 3015 if (key.offset + datal <= off ||
e4355f34
FDBM		 3016 key.offset >= off + len - 1) {
3017 path->slots[0]++;
3018 goto process_slot;
3019 }
3020
3021 size = btrfs_item_size_nr(leaf, slot);
3022 read_extent_buffer(leaf, buf,
3023 btrfs_item_ptr_offset(leaf, slot),
3024 size);
3025
3026 btrfs_release_path(path);
3027 path->leave_spinning = 0;
c5c9cd4d 3028
31840ae1 3029 memcpy(&new_key, &key, sizeof(new_key));
33345d01 3030 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 3031 if (off <= key.offset)
3032 new_key.offset = key.offset + destoff - off;
3033 else
3034 new_key.offset = destoff;
31840ae1 3035
b6f3409b
SW		 3036 /*
3037 * 1 - adjusting old extent (we may have to split it)
3038 * 1 - add new extent
3039 * 1 - inode update
3040 */
3041 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 3042 if (IS_ERR(trans)) {
3043 ret = PTR_ERR(trans);
3044 goto out;
3045 }
3046
c8a894d7
CM		 3047 if (type == BTRFS_FILE_EXTENT_REG ||
3048 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 3049 /*
3050 * a | --- range to clone ---| b
3051 * | ------------- extent ------------- |
3052 */
3053
3054 /* substract range b */
3055 if (key.offset + datal > off + len)
3056 datal = off + len - key.offset;
3057
3058 /* substract range a */
a22285a6
YZ		 3059 if (off > key.offset) {
3060 datao += off - key.offset;
3061 datal -= off - key.offset;
3062 }
3063
5dc562c5 3064 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 3065 new_key.offset,
3066 new_key.offset + datal,
2671485d 3067 1);
79787eaa 3068 if (ret) {
3f9e3df8 3069 if (ret != -EOPNOTSUPP)
00fdf13a
LB		 3070 btrfs_abort_transaction(trans,
3071 root, ret);
79787eaa
JM		 3072 btrfs_end_transaction(trans, root);
3073 goto out;
3074 }
a22285a6 3075
c5c9cd4d
SW		 3076 ret = btrfs_insert_empty_item(trans, root, path,
3077 &new_key, size);
79787eaa
JM		 3078 if (ret) {
3079 btrfs_abort_transaction(trans, root,
3080 ret);
3081 btrfs_end_transaction(trans, root);
3082 goto out;
3083 }
c5c9cd4d
SW		 3084
3085 leaf = path->nodes[0];
3086 slot = path->slots[0];
3087 write_extent_buffer(leaf, buf,
31840ae1
ZY		 3088 btrfs_item_ptr_offset(leaf, slot),
3089 size);
ae01a0ab 3090
c5c9cd4d 3091 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 3092 struct btrfs_file_extent_item);
c5c9cd4d 3093
c5c9cd4d
SW		 3094 /* disko == 0 means it's a hole */
3095 if (!disko)
3096 datao = 0;
c5c9cd4d
SW		 3097
3098 btrfs_set_file_extent_offset(leaf, extent,
3099 datao);
3100 btrfs_set_file_extent_num_bytes(leaf, extent,
3101 datal);
3102 if (disko) {
3103 inode_add_bytes(inode, datal);
ae01a0ab 3104 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 3105 disko, diskl, 0,
3106 root->root_key.objectid,
33345d01 3107 btrfs_ino(inode),
66d7e7f0
AJ		 3108 new_key.offset - datao,
3109 0);
79787eaa
JM		 3110 if (ret) {
3111 btrfs_abort_transaction(trans,
3112 root,
3113 ret);
3114 btrfs_end_transaction(trans,
3115 root);
3116 goto out;
3117
3118 }
f46b5a66 3119 }
c5c9cd4d
SW		 3120 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3121 u64 skip = 0;
3122 u64 trim = 0;
d3ecfcdf
LB		 3123 u64 aligned_end = 0;
3124
c5c9cd4d
SW		 3125 if (off > key.offset) {
3126 skip = off - key.offset;
3127 new_key.offset += skip;
3128 }
d397712b 3129
aa42ffd9
LB		 3130 if (key.offset + datal > off + len)
3131 trim = key.offset + datal - (off + len);
d397712b 3132
c5c9cd4d 3133 if (comp && (skip || trim)) {
c5c9cd4d 3134 ret = -EINVAL;
a22285a6 3135 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 3136 goto out;
3137 }
3138 size -= skip + trim;
3139 datal -= skip + trim;
a22285a6 3140
d3ecfcdf
LB		 3141 aligned_end = ALIGN(new_key.offset + datal,
3142 root->sectorsize);
5dc562c5 3143 ret = btrfs_drop_extents(trans, root, inode,
a22285a6 3144 new_key.offset,
d3ecfcdf 3145 aligned_end,
2671485d 3146 1);
79787eaa 3147 if (ret) {
3f9e3df8 3148 if (ret != -EOPNOTSUPP)
3a29bc09
CM		 3149 btrfs_abort_transaction(trans,
3150 root, ret);
79787eaa
JM		 3151 btrfs_end_transaction(trans, root);
3152 goto out;
3153 }
a22285a6 3154
c5c9cd4d
SW		 3155 ret = btrfs_insert_empty_item(trans, root, path,
3156 &new_key, size);
79787eaa
JM		 3157 if (ret) {
3158 btrfs_abort_transaction(trans, root,
3159 ret);
3160 btrfs_end_transaction(trans, root);
3161 goto out;
3162 }
c5c9cd4d
SW		 3163
3164 if (skip) {
d397712b
CM		 3165 u32 start =
3166 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 3167 memmove(buf+start, buf+start+skip,
3168 datal);
3169 }
3170
3171 leaf = path->nodes[0];
3172 slot = path->slots[0];
3173 write_extent_buffer(leaf, buf,
3174 btrfs_item_ptr_offset(leaf, slot),
3175 size);
3176 inode_add_bytes(inode, datal);
f46b5a66 3177 }
c5c9cd4d
SW		 3178
3179 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 3180 btrfs_release_path(path);
c5c9cd4d 3181
0c4d2d95 3182 inode_inc_iversion(inode);
a22285a6 3183 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 3184
3185 /*
3186 * we round up to the block size at eof when
3187 * determining which extents to clone above,
3188 * but shouldn't round up the file size
3189 */
3190 endoff = new_key.offset + datal;
5f3888ff
LZ		 3191 if (endoff > destoff+olen)
3192 endoff = destoff+olen;
b5384d48
SW		 3193 if (endoff > inode->i_size)
3194 btrfs_i_size_write(inode, endoff);
3195
a22285a6 3196 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 3197 if (ret) {
3198 btrfs_abort_transaction(trans, root, ret);
3199 btrfs_end_transaction(trans, root);
3200 goto out;
3201 }
3202 ret = btrfs_end_transaction(trans, root);
a22285a6 3203 }
b3b4aa74 3204 btrfs_release_path(path);
f46b5a66 3205 key.offset++;
f46b5a66 3206 }
f46b5a66 3207 ret = 0;
32b7c687 3208
f46b5a66 3209out:
b3b4aa74 3210 btrfs_release_path(path);
32b7c687
MF		 3211 btrfs_free_path(path);
3212 vfree(buf);
3213 return ret;
3214}
3215
3216static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3217 u64 off, u64 olen, u64 destoff)
3218{
54563d41 3219 struct inode *inode = file_inode(file);
32b7c687
MF		 3220 struct btrfs_root *root = BTRFS_I(inode)->root;
3221 struct fd src_file;
3222 struct inode *src;
3223 int ret;
3224 u64 len = olen;
3225 u64 bs = root->fs_info->sb->s_blocksize;
3226 int same_inode = 0;
3227
3228 /*
3229 * TODO:
3230 * - split compressed inline extents. annoying: we need to
3231 * decompress into destination's address_space (the file offset
3232 * may change, so source mapping won't do), then recompress (or
3233 * otherwise reinsert) a subrange.
00fdf13a
LB		 3234 *
3235 * - split destination inode's inline extents. The inline extents can
3236 * be either compressed or non-compressed.
32b7c687
MF		 3237 */
3238
3239 /* the destination must be opened for writing */
3240 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3241 return -EINVAL;
3242
3243 if (btrfs_root_readonly(root))
3244 return -EROFS;
3245
3246 ret = mnt_want_write_file(file);
3247 if (ret)
3248 return ret;
3249
3250 src_file = fdget(srcfd);
3251 if (!src_file.file) {
3252 ret = -EBADF;
3253 goto out_drop_write;
3254 }
3255
3256 ret = -EXDEV;
3257 if (src_file.file->f_path.mnt != file->f_path.mnt)
3258 goto out_fput;
3259
3260 src = file_inode(src_file.file);
3261
3262 ret = -EINVAL;
3263 if (src == inode)
3264 same_inode = 1;
3265
3266 /* the src must be open for reading */
3267 if (!(src_file.file->f_mode & FMODE_READ))
3268 goto out_fput;
3269
3270 /* don't make the dst file partly checksummed */
3271 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3272 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3273 goto out_fput;
3274
3275 ret = -EISDIR;
3276 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3277 goto out_fput;
3278
3279 ret = -EXDEV;
3280 if (src->i_sb != inode->i_sb)
3281 goto out_fput;
3282
3283 if (!same_inode) {
3284 if (inode < src) {
3285 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3286 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3287 } else {
3288 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3289 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3290 }
3291 } else {
3292 mutex_lock(&src->i_mutex);
3293 }
3294
3295 /* determine range to clone */
3296 ret = -EINVAL;
3297 if (off + len > src->i_size || off + len < off)
3298 goto out_unlock;
3299 if (len == 0)
3300 olen = len = src->i_size - off;
3301 /* if we extend to eof, continue to block boundary */
3302 if (off + len == src->i_size)
3303 len = ALIGN(src->i_size, bs) - off;
3304
3305 /* verify the end result is block aligned */
3306 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3307 !IS_ALIGNED(destoff, bs))
3308 goto out_unlock;
3309
3310 /* verify if ranges are overlapped within the same file */
3311 if (same_inode) {
3312 if (destoff + len > off && destoff < off + len)
3313 goto out_unlock;
3314 }
3315
3316 if (destoff > inode->i_size) {
3317 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3318 if (ret)
3319 goto out_unlock;
3320 }
3321
3322 /* truncate page cache pages from target inode range */
3323 truncate_inode_pages_range(&inode->i_data, destoff,
3324 PAGE_CACHE_ALIGN(destoff + len) - 1);
3325
3326 lock_extent_range(src, off, len);
3327
3328 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3329
aa42ffd9 3330 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66 3331out_unlock:
c57c2b3e
FDBM		 3332 if (!same_inode) {
3333 if (inode < src) {
3334 mutex_unlock(&src->i_mutex);
3335 mutex_unlock(&inode->i_mutex);
3336 } else {
3337 mutex_unlock(&inode->i_mutex);
3338 mutex_unlock(&src->i_mutex);
3339 }
3340 } else {
3341 mutex_unlock(&src->i_mutex);
3342 }
f46b5a66 3343out_fput:
2903ff01 3344 fdput(src_file);
ab67b7c1 3345out_drop_write:
2a79f17e 3346 mnt_drop_write_file(file);
f46b5a66
CH		 3347 return ret;
3348}
3349
7a865e8a 3350static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 3351{
3352 struct btrfs_ioctl_clone_range_args args;
3353
7a865e8a 3354 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 3355 return -EFAULT;
3356 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3357 args.src_length, args.dest_offset);
3358}
3359
f46b5a66
CH		 3360/*
3361 * there are many ways the trans_start and trans_end ioctls can lead
3362 * to deadlocks. They should only be used by applications that
3363 * basically own the machine, and have a very in depth understanding
3364 * of all the possible deadlocks and enospc problems.
3365 */
b2950863 3366static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66 3367{
496ad9aa 3368 struct inode *inode = file_inode(file);
f46b5a66
CH		 3369 struct btrfs_root *root = BTRFS_I(inode)->root;
3370 struct btrfs_trans_handle *trans;
1ab86aed 3371 int ret;
f46b5a66 3372
1ab86aed 3373 ret = -EPERM;
df5b5520 3374 if (!capable(CAP_SYS_ADMIN))
1ab86aed 3375 goto out;
df5b5520 3376
1ab86aed
SW		 3377 ret = -EINPROGRESS;
3378 if (file->private_data)
f46b5a66 3379 goto out;
9ca9ee09 3380
b83cc969
LZ		 3381 ret = -EROFS;
3382 if (btrfs_root_readonly(root))
3383 goto out;
3384
a561be71 3385 ret = mnt_want_write_file(file);
c146afad
YZ		 3386 if (ret)
3387 goto out;
3388
a4abeea4 3389 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 3390
1ab86aed 3391 ret = -ENOMEM;
7a7eaa40 3392 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 3393 if (IS_ERR(trans))
1ab86aed
SW		 3394 goto out_drop;
3395
3396 file->private_data = trans;
3397 return 0;
3398
3399out_drop:
a4abeea4 3400 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 3401 mnt_drop_write_file(file);
f46b5a66 3402out:
f46b5a66
CH		 3403 return ret;
3404}
3405
6ef5ed0d
JB		 3406static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3407{
496ad9aa 3408 struct inode *inode = file_inode(file);
6ef5ed0d
JB		 3409 struct btrfs_root *root = BTRFS_I(inode)->root;
3410 struct btrfs_root *new_root;
3411 struct btrfs_dir_item *di;
3412 struct btrfs_trans_handle *trans;
3413 struct btrfs_path *path;
3414 struct btrfs_key location;
3415 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 3416 u64 objectid = 0;
3417 u64 dir_id;
3c04ce01 3418 int ret;
6ef5ed0d
JB		 3419
3420 if (!capable(CAP_SYS_ADMIN))
3421 return -EPERM;
3422
3c04ce01
MX		 3423 ret = mnt_want_write_file(file);
3424 if (ret)
3425 return ret;
3426
3427 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3428 ret = -EFAULT;
3429 goto out;
3430 }
6ef5ed0d
JB		 3431
3432 if (!objectid)
1cecf579 3433 objectid = BTRFS_FS_TREE_OBJECTID;
6ef5ed0d
JB		 3434
3435 location.objectid = objectid;
3436 location.type = BTRFS_ROOT_ITEM_KEY;
3437 location.offset = (u64)-1;
3438
3439 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3c04ce01
MX		 3440 if (IS_ERR(new_root)) {
3441 ret = PTR_ERR(new_root);
3442 goto out;
3443 }
6ef5ed0d 3444
6ef5ed0d 3445 path = btrfs_alloc_path();
3c04ce01
MX		 3446 if (!path) {
3447 ret = -ENOMEM;
3448 goto out;
3449 }
6ef5ed0d
JB		 3450 path->leave_spinning = 1;
3451
3452 trans = btrfs_start_transaction(root, 1);
98d5dc13 3453 if (IS_ERR(trans)) {
6ef5ed0d 3454 btrfs_free_path(path);
3c04ce01
MX		 3455 ret = PTR_ERR(trans);
3456 goto out;
6ef5ed0d
JB		 3457 }
3458
6c41761f 3459 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 3460 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3461 dir_id, "default", 7, 1);
cf1e99a4 3462 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 3463 btrfs_free_path(path);
3464 btrfs_end_transaction(trans, root);
efe120a0
FH		 3465 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3466 "item, this isn't going to work");
3c04ce01
MX		 3467 ret = -ENOENT;
3468 goto out;
6ef5ed0d
JB		 3469 }
3470
3471 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3472 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3473 btrfs_mark_buffer_dirty(path->nodes[0]);
3474 btrfs_free_path(path);
3475
2b0ce2c2 3476 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d 3477 btrfs_end_transaction(trans, root);
3c04ce01
MX		 3478out:
3479 mnt_drop_write_file(file);
3480 return ret;
6ef5ed0d
JB		 3481}
3482
5af3e8cc
SB		 3483void btrfs_get_block_group_info(struct list_head *groups_list,
3484 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 3485{
3486 struct btrfs_block_group_cache *block_group;
3487
3488 space->total_bytes = 0;
3489 space->used_bytes = 0;
3490 space->flags = 0;
3491 list_for_each_entry(block_group, groups_list, list) {
3492 space->flags = block_group->flags;
3493 space->total_bytes += block_group->key.offset;
3494 space->used_bytes +=
3495 btrfs_block_group_used(&block_group->item);
3496 }
3497}
3498
48a3b636 3499static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1406e432
JB		 3500{
3501 struct btrfs_ioctl_space_args space_args;
3502 struct btrfs_ioctl_space_info space;
3503 struct btrfs_ioctl_space_info *dest;
7fde62bf 3504 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 3505 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 3506 struct btrfs_space_info *info;
bf5fc093
JB		 3507 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3508 BTRFS_BLOCK_GROUP_SYSTEM,
3509 BTRFS_BLOCK_GROUP_METADATA,
3510 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3511 int num_types = 4;
7fde62bf 3512 int alloc_size;
1406e432 3513 int ret = 0;
51788b1b 3514 u64 slot_count = 0;
bf5fc093 3515 int i, c;
1406e432
JB		 3516
3517 if (copy_from_user(&space_args,
3518 (struct btrfs_ioctl_space_args __user *)arg,
3519 sizeof(space_args)))
3520 return -EFAULT;
3521
bf5fc093
JB		 3522 for (i = 0; i < num_types; i++) {
3523 struct btrfs_space_info *tmp;
3524
3525 info = NULL;
3526 rcu_read_lock();
3527 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3528 list) {
3529 if (tmp->flags == types[i]) {
3530 info = tmp;
3531 break;
3532 }
3533 }
3534 rcu_read_unlock();
3535
3536 if (!info)
3537 continue;
3538
3539 down_read(&info->groups_sem);
3540 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3541 if (!list_empty(&info->block_groups[c]))
3542 slot_count++;
3543 }
3544 up_read(&info->groups_sem);
3545 }
7fde62bf 3546
36523e95
DS		 3547 /*
3548 * Global block reserve, exported as a space_info
3549 */
3550 slot_count++;
3551
7fde62bf
CM		 3552 /* space_slots == 0 means they are asking for a count */
3553 if (space_args.space_slots == 0) {
3554 space_args.total_spaces = slot_count;
3555 goto out;
3556 }
bf5fc093 3557
51788b1b 3558 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 3559
7fde62bf 3560 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 3561
7fde62bf
CM		 3562 /* we generally have at most 6 or so space infos, one for each raid
3563 * level. So, a whole page should be more than enough for everyone
3564 */
3565 if (alloc_size > PAGE_CACHE_SIZE)
3566 return -ENOMEM;
3567
1406e432 3568 space_args.total_spaces = 0;
7fde62bf
CM		 3569 dest = kmalloc(alloc_size, GFP_NOFS);
3570 if (!dest)
3571 return -ENOMEM;
3572 dest_orig = dest;
1406e432 3573
7fde62bf 3574 /* now we have a buffer to copy into */
bf5fc093
JB		 3575 for (i = 0; i < num_types; i++) {
3576 struct btrfs_space_info *tmp;
3577
51788b1b
DR		 3578 if (!slot_count)
3579 break;
3580
bf5fc093
JB		 3581 info = NULL;
3582 rcu_read_lock();
3583 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3584 list) {
3585 if (tmp->flags == types[i]) {
3586 info = tmp;
3587 break;
3588 }
3589 }
3590 rcu_read_unlock();
7fde62bf 3591
bf5fc093
JB		 3592 if (!info)
3593 continue;
3594 down_read(&info->groups_sem);
3595 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3596 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 3597 btrfs_get_block_group_info(
3598 &info->block_groups[c], &space);
bf5fc093
JB		 3599 memcpy(dest, &space, sizeof(space));
3600 dest++;
3601 space_args.total_spaces++;
51788b1b 3602 slot_count--;
bf5fc093 3603 }
51788b1b
DR		 3604 if (!slot_count)
3605 break;
bf5fc093
JB		 3606 }
3607 up_read(&info->groups_sem);
1406e432 3608 }
1406e432 3609
36523e95
DS		 3610 /*
3611 * Add global block reserve
3612 */
3613 if (slot_count) {
3614 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
3615
3616 spin_lock(&block_rsv->lock);
3617 space.total_bytes = block_rsv->size;
3618 space.used_bytes = block_rsv->size - block_rsv->reserved;
3619 spin_unlock(&block_rsv->lock);
3620 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3621 memcpy(dest, &space, sizeof(space));
3622 space_args.total_spaces++;
3623 }
3624
2eec6c81 3625 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3626 (arg + sizeof(struct btrfs_ioctl_space_args));
3627
3628 if (copy_to_user(user_dest, dest_orig, alloc_size))
3629 ret = -EFAULT;
3630
3631 kfree(dest_orig);
3632out:
3633 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3634 ret = -EFAULT;
3635
3636 return ret;
3637}
3638
f46b5a66
CH		 3639/*
3640 * there are many ways the trans_start and trans_end ioctls can lead
3641 * to deadlocks. They should only be used by applications that
3642 * basically own the machine, and have a very in depth understanding
3643 * of all the possible deadlocks and enospc problems.
3644 */
3645long btrfs_ioctl_trans_end(struct file *file)
3646{
496ad9aa 3647 struct inode *inode = file_inode(file);
f46b5a66
CH		 3648 struct btrfs_root *root = BTRFS_I(inode)->root;
3649 struct btrfs_trans_handle *trans;
f46b5a66 3650
f46b5a66 3651 trans = file->private_data;
1ab86aed
SW		 3652 if (!trans)
3653 return -EINVAL;
b214107e 3654 file->private_data = NULL;
9ca9ee09 3655
1ab86aed
SW		 3656 btrfs_end_transaction(trans, root);
3657
a4abeea4 3658 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3659
2a79f17e 3660 mnt_drop_write_file(file);
1ab86aed 3661 return 0;
f46b5a66
CH		 3662}
3663
9a8c28be
MX		 3664static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3665 void __user *argp)
46204592 3666{
46204592
SW		 3667 struct btrfs_trans_handle *trans;
3668 u64 transid;
db5b493a 3669 int ret;
46204592 3670
d4edf39b 3671 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 3672 if (IS_ERR(trans)) {
3673 if (PTR_ERR(trans) != -ENOENT)
3674 return PTR_ERR(trans);
3675
3676 /* No running transaction, don't bother */
3677 transid = root->fs_info->last_trans_committed;
3678 goto out;
3679 }
46204592 3680 transid = trans->transid;
db5b493a 3681 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3682 if (ret) {
3683 btrfs_end_transaction(trans, root);
db5b493a 3684 return ret;
8b2b2d3c 3685 }
ff7c1d33 3686out:
46204592
SW		 3687 if (argp)
3688 if (copy_to_user(argp, &transid, sizeof(transid)))
3689 return -EFAULT;
3690 return 0;
3691}
3692
9a8c28be
MX		 3693static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3694 void __user *argp)
46204592 3695{
46204592
SW		 3696 u64 transid;
3697
3698 if (argp) {
3699 if (copy_from_user(&transid, argp, sizeof(transid)))
3700 return -EFAULT;
3701 } else {
3702 transid = 0; /* current trans */
3703 }
3704 return btrfs_wait_for_commit(root, transid);
3705}
3706
b8e95489 3707static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 3708{
496ad9aa 3709 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
475f6387 3710 struct btrfs_ioctl_scrub_args *sa;
b8e95489 3711 int ret;
475f6387
JS		 3712
3713 if (!capable(CAP_SYS_ADMIN))
3714 return -EPERM;
3715
3716 sa = memdup_user(arg, sizeof(*sa));
3717 if (IS_ERR(sa))
3718 return PTR_ERR(sa);
3719
b8e95489
MX		 3720 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3721 ret = mnt_want_write_file(file);
3722 if (ret)
3723 goto out;
3724 }
3725
aa1b8cd4 3726 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 3727 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3728 0);
475f6387
JS		 3729
3730 if (copy_to_user(arg, sa, sizeof(*sa)))
3731 ret = -EFAULT;
3732
b8e95489
MX		 3733 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3734 mnt_drop_write_file(file);
3735out:
475f6387
JS		 3736 kfree(sa);
3737 return ret;
3738}
3739
3740static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3741{
3742 if (!capable(CAP_SYS_ADMIN))
3743 return -EPERM;
3744
aa1b8cd4 3745 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3746}
3747
3748static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3749 void __user *arg)
3750{
3751 struct btrfs_ioctl_scrub_args *sa;
3752 int ret;
3753
3754 if (!capable(CAP_SYS_ADMIN))
3755 return -EPERM;
3756
3757 sa = memdup_user(arg, sizeof(*sa));
3758 if (IS_ERR(sa))
3759 return PTR_ERR(sa);
3760
3761 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3762
3763 if (copy_to_user(arg, sa, sizeof(*sa)))
3764 ret = -EFAULT;
3765
3766 kfree(sa);
3767 return ret;
3768}
3769
c11d2c23 3770static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3771 void __user *arg)
c11d2c23
SB		 3772{
3773 struct btrfs_ioctl_get_dev_stats *sa;
3774 int ret;
3775
c11d2c23
SB		 3776 sa = memdup_user(arg, sizeof(*sa));
3777 if (IS_ERR(sa))
3778 return PTR_ERR(sa);
3779
b27f7c0c
DS		 3780 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3781 kfree(sa);
3782 return -EPERM;
3783 }
3784
3785 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3786
3787 if (copy_to_user(arg, sa, sizeof(*sa)))
3788 ret = -EFAULT;
3789
3790 kfree(sa);
3791 return ret;
3792}
3793
3f6bcfbd
SB		 3794static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3795{
3796 struct btrfs_ioctl_dev_replace_args *p;
3797 int ret;
3798
3799 if (!capable(CAP_SYS_ADMIN))
3800 return -EPERM;
3801
3802 p = memdup_user(arg, sizeof(*p));
3803 if (IS_ERR(p))
3804 return PTR_ERR(p);
3805
3806 switch (p->cmd) {
3807 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
adfa97cb
ID		 3808 if (root->fs_info->sb->s_flags & MS_RDONLY) {
3809 ret = -EROFS;
3810 goto out;
3811 }
3f6bcfbd
SB		 3812 if (atomic_xchg(
3813 &root->fs_info->mutually_exclusive_operation_running,
3814 1)) {
e57138b3 3815 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd
SB		 3816 } else {
3817 ret = btrfs_dev_replace_start(root, p);
3818 atomic_set(
3819 &root->fs_info->mutually_exclusive_operation_running,
3820 0);
3821 }
3822 break;
3823 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3824 btrfs_dev_replace_status(root->fs_info, p);
3825 ret = 0;
3826 break;
3827 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3828 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3829 break;
3830 default:
3831 ret = -EINVAL;
3832 break;
3833 }
3834
3835 if (copy_to_user(arg, p, sizeof(*p)))
3836 ret = -EFAULT;
adfa97cb 3837out:
3f6bcfbd
SB		 3838 kfree(p);
3839 return ret;
3840}
3841
d7728c96
JS		 3842static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3843{
3844 int ret = 0;
3845 int i;
740c3d22 3846 u64 rel_ptr;
d7728c96 3847 int size;
806468f8 3848 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3849 struct inode_fs_paths *ipath = NULL;
3850 struct btrfs_path *path;
3851
82b22ac8 3852 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 3853 return -EPERM;
3854
3855 path = btrfs_alloc_path();
3856 if (!path) {
3857 ret = -ENOMEM;
3858 goto out;
3859 }
3860
3861 ipa = memdup_user(arg, sizeof(*ipa));
3862 if (IS_ERR(ipa)) {
3863 ret = PTR_ERR(ipa);
3864 ipa = NULL;
3865 goto out;
3866 }
3867
3868 size = min_t(u32, ipa->size, 4096);
3869 ipath = init_ipath(size, root, path);
3870 if (IS_ERR(ipath)) {
3871 ret = PTR_ERR(ipath);
3872 ipath = NULL;
3873 goto out;
3874 }
3875
3876 ret = paths_from_inode(ipa->inum, ipath);
3877 if (ret < 0)
3878 goto out;
3879
3880 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3881 rel_ptr = ipath->fspath->val[i] -
3882 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3883 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3884 }
3885
745c4d8e
JM		 3886 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3887 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3888 if (ret) {
3889 ret = -EFAULT;
3890 goto out;
3891 }
3892
3893out:
3894 btrfs_free_path(path);
3895 free_ipath(ipath);
3896 kfree(ipa);
3897
3898 return ret;
3899}
3900
3901static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3902{
3903 struct btrfs_data_container *inodes = ctx;
3904 const size_t c = 3 * sizeof(u64);
3905
3906 if (inodes->bytes_left >= c) {
3907 inodes->bytes_left -= c;
3908 inodes->val[inodes->elem_cnt] = inum;
3909 inodes->val[inodes->elem_cnt + 1] = offset;
3910 inodes->val[inodes->elem_cnt + 2] = root;
3911 inodes->elem_cnt += 3;
3912 } else {
3913 inodes->bytes_missing += c - inodes->bytes_left;
3914 inodes->bytes_left = 0;
3915 inodes->elem_missed += 3;
3916 }
3917
3918 return 0;
3919}
3920
3921static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3922 void __user *arg)
3923{
3924 int ret = 0;
3925 int size;
d7728c96
JS		 3926 struct btrfs_ioctl_logical_ino_args *loi;
3927 struct btrfs_data_container *inodes = NULL;
3928 struct btrfs_path *path = NULL;
d7728c96
JS		 3929
3930 if (!capable(CAP_SYS_ADMIN))
3931 return -EPERM;
3932
3933 loi = memdup_user(arg, sizeof(*loi));
3934 if (IS_ERR(loi)) {
3935 ret = PTR_ERR(loi);
3936 loi = NULL;
3937 goto out;
3938 }
3939
3940 path = btrfs_alloc_path();
3941 if (!path) {
3942 ret = -ENOMEM;
3943 goto out;
3944 }
3945
425d17a2 3946 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3947 inodes = init_data_container(size);
3948 if (IS_ERR(inodes)) {
3949 ret = PTR_ERR(inodes);
3950 inodes = NULL;
3951 goto out;
3952 }
3953
df031f07
LB		 3954 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3955 build_ino_list, inodes);
3956 if (ret == -EINVAL)
d7728c96
JS		 3957 ret = -ENOENT;
3958 if (ret < 0)
3959 goto out;
3960
745c4d8e
JM		 3961 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3962 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3963 if (ret)
3964 ret = -EFAULT;
3965
3966out:
3967 btrfs_free_path(path);
425d17a2 3968 vfree(inodes);
d7728c96
JS		 3969 kfree(loi);
3970
3971 return ret;
3972}
3973
19a39dce 3974void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3975 struct btrfs_ioctl_balance_args *bargs)
3976{
3977 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3978
3979 bargs->flags = bctl->flags;
3980
837d5b6e
ID		 3981 if (atomic_read(&fs_info->balance_running))
3982 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3983 if (atomic_read(&fs_info->balance_pause_req))
3984 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3985 if (atomic_read(&fs_info->balance_cancel_req))
3986 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3987
c9e9f97b
ID		 3988 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3989 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3990 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3991
3992 if (lock) {
3993 spin_lock(&fs_info->balance_lock);
3994 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3995 spin_unlock(&fs_info->balance_lock);
3996 } else {
3997 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3998 }
c9e9f97b
ID		 3999}
4000
9ba1f6e4 4001static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 4002{
496ad9aa 4003 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 4004 struct btrfs_fs_info *fs_info = root->fs_info;
4005 struct btrfs_ioctl_balance_args *bargs;
4006 struct btrfs_balance_control *bctl;
ed0fb78f 4007 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 4008 int ret;
4009
4010 if (!capable(CAP_SYS_ADMIN))
4011 return -EPERM;
4012
e54bfa31 4013 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 4014 if (ret)
4015 return ret;
4016
ed0fb78f
ID		 4017again:
4018 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4019 mutex_lock(&fs_info->volume_mutex);
4020 mutex_lock(&fs_info->balance_mutex);
4021 need_unlock = true;
4022 goto locked;
4023 }
4024
4025 /*
4026 * mut. excl. ops lock is locked. Three possibilites:
4027 * (1) some other op is running
4028 * (2) balance is running
4029 * (3) balance is paused -- special case (think resume)
4030 */
c9e9f97b 4031 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 4032 if (fs_info->balance_ctl) {
4033 /* this is either (2) or (3) */
4034 if (!atomic_read(&fs_info->balance_running)) {
4035 mutex_unlock(&fs_info->balance_mutex);
4036 if (!mutex_trylock(&fs_info->volume_mutex))
4037 goto again;
4038 mutex_lock(&fs_info->balance_mutex);
4039
4040 if (fs_info->balance_ctl &&
4041 !atomic_read(&fs_info->balance_running)) {
4042 /* this is (3) */
4043 need_unlock = false;
4044 goto locked;
4045 }
4046
4047 mutex_unlock(&fs_info->balance_mutex);
4048 mutex_unlock(&fs_info->volume_mutex);
4049 goto again;
4050 } else {
4051 /* this is (2) */
4052 mutex_unlock(&fs_info->balance_mutex);
4053 ret = -EINPROGRESS;
4054 goto out;
4055 }
4056 } else {
4057 /* this is (1) */
4058 mutex_unlock(&fs_info->balance_mutex);
e57138b3 4059 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 4060 goto out;
4061 }
4062
4063locked:
4064 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
c9e9f97b
ID		 4065
4066 if (arg) {
4067 bargs = memdup_user(arg, sizeof(*bargs));
4068 if (IS_ERR(bargs)) {
4069 ret = PTR_ERR(bargs);
ed0fb78f 4070 goto out_unlock;
c9e9f97b 4071 }
de322263
ID		 4072
4073 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4074 if (!fs_info->balance_ctl) {
4075 ret = -ENOTCONN;
4076 goto out_bargs;
4077 }
4078
4079 bctl = fs_info->balance_ctl;
4080 spin_lock(&fs_info->balance_lock);
4081 bctl->flags |= BTRFS_BALANCE_RESUME;
4082 spin_unlock(&fs_info->balance_lock);
4083
4084 goto do_balance;
4085 }
c9e9f97b
ID		 4086 } else {
4087 bargs = NULL;
4088 }
4089
ed0fb78f 4090 if (fs_info->balance_ctl) {
837d5b6e
ID		 4091 ret = -EINPROGRESS;
4092 goto out_bargs;
4093 }
4094
c9e9f97b
ID		 4095 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
4096 if (!bctl) {
4097 ret = -ENOMEM;
4098 goto out_bargs;
4099 }
4100
4101 bctl->fs_info = fs_info;
4102 if (arg) {
4103 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4104 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4105 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4106
4107 bctl->flags = bargs->flags;
f43ffb60
ID		 4108 } else {
4109 /* balance everything - no filters */
4110 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 4111 }
4112
de322263 4113do_balance:
c9e9f97b 4114 /*
ed0fb78f
ID		 4115 * Ownership of bctl and mutually_exclusive_operation_running
4116 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4117 * or, if restriper was paused all the way until unmount, in
4118 * free_fs_info. mutually_exclusive_operation_running is
4119 * cleared in __cancel_balance.
c9e9f97b 4120 */
ed0fb78f
ID		 4121 need_unlock = false;
4122
4123 ret = btrfs_balance(bctl, bargs);
4124
c9e9f97b
ID		 4125 if (arg) {
4126 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4127 ret = -EFAULT;
4128 }
4129
4130out_bargs:
4131 kfree(bargs);
ed0fb78f 4132out_unlock:
c9e9f97b
ID		 4133 mutex_unlock(&fs_info->balance_mutex);
4134 mutex_unlock(&fs_info->volume_mutex);
ed0fb78f
ID		 4135 if (need_unlock)
4136 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4137out:
e54bfa31 4138 mnt_drop_write_file(file);
c9e9f97b
ID		 4139 return ret;
4140}
4141
837d5b6e
ID		 4142static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4143{
4144 if (!capable(CAP_SYS_ADMIN))
4145 return -EPERM;
4146
4147 switch (cmd) {
4148 case BTRFS_BALANCE_CTL_PAUSE:
4149 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 4150 case BTRFS_BALANCE_CTL_CANCEL:
4151 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 4152 }
4153
4154 return -EINVAL;
4155}
4156
19a39dce
ID		 4157static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4158 void __user *arg)
4159{
4160 struct btrfs_fs_info *fs_info = root->fs_info;
4161 struct btrfs_ioctl_balance_args *bargs;
4162 int ret = 0;
4163
4164 if (!capable(CAP_SYS_ADMIN))
4165 return -EPERM;
4166
4167 mutex_lock(&fs_info->balance_mutex);
4168 if (!fs_info->balance_ctl) {
4169 ret = -ENOTCONN;
4170 goto out;
4171 }
4172
4173 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4174 if (!bargs) {
4175 ret = -ENOMEM;
4176 goto out;
4177 }
4178
4179 update_ioctl_balance_args(fs_info, 1, bargs);
4180
4181 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4182 ret = -EFAULT;
4183
4184 kfree(bargs);
4185out:
4186 mutex_unlock(&fs_info->balance_mutex);
4187 return ret;
4188}
4189
905b0dda 4190static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4191{
496ad9aa 4192 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4193 struct btrfs_ioctl_quota_ctl_args *sa;
4194 struct btrfs_trans_handle *trans = NULL;
4195 int ret;
4196 int err;
4197
4198 if (!capable(CAP_SYS_ADMIN))
4199 return -EPERM;
4200
905b0dda
MX		 4201 ret = mnt_want_write_file(file);
4202 if (ret)
4203 return ret;
5d13a37b
AJ		 4204
4205 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4206 if (IS_ERR(sa)) {
4207 ret = PTR_ERR(sa);
4208 goto drop_write;
4209 }
5d13a37b 4210
7708f029 4211 down_write(&root->fs_info->subvol_sem);
2f232036
JS		 4212 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4213 if (IS_ERR(trans)) {
4214 ret = PTR_ERR(trans);
4215 goto out;
5d13a37b
AJ		 4216 }
4217
4218 switch (sa->cmd) {
4219 case BTRFS_QUOTA_CTL_ENABLE:
4220 ret = btrfs_quota_enable(trans, root->fs_info);
4221 break;
4222 case BTRFS_QUOTA_CTL_DISABLE:
4223 ret = btrfs_quota_disable(trans, root->fs_info);
4224 break;
5d13a37b
AJ		 4225 default:
4226 ret = -EINVAL;
4227 break;
4228 }
4229
2f232036
JS		 4230 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4231 if (err && !ret)
4232 ret = err;
5d13a37b
AJ		 4233out:
4234 kfree(sa);
7708f029 4235 up_write(&root->fs_info->subvol_sem);
905b0dda
MX		 4236drop_write:
4237 mnt_drop_write_file(file);
5d13a37b
AJ		 4238 return ret;
4239}
4240
905b0dda 4241static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4242{
496ad9aa 4243 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4244 struct btrfs_ioctl_qgroup_assign_args *sa;
4245 struct btrfs_trans_handle *trans;
4246 int ret;
4247 int err;
4248
4249 if (!capable(CAP_SYS_ADMIN))
4250 return -EPERM;
4251
905b0dda
MX		 4252 ret = mnt_want_write_file(file);
4253 if (ret)
4254 return ret;
5d13a37b
AJ		 4255
4256 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4257 if (IS_ERR(sa)) {
4258 ret = PTR_ERR(sa);
4259 goto drop_write;
4260 }
5d13a37b
AJ		 4261
4262 trans = btrfs_join_transaction(root);
4263 if (IS_ERR(trans)) {
4264 ret = PTR_ERR(trans);
4265 goto out;
4266 }
4267
4268 /* FIXME: check if the IDs really exist */
4269 if (sa->assign) {
4270 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4271 sa->src, sa->dst);
4272 } else {
4273 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4274 sa->src, sa->dst);
4275 }
4276
4277 err = btrfs_end_transaction(trans, root);
4278 if (err && !ret)
4279 ret = err;
4280
4281out:
4282 kfree(sa);
905b0dda
MX		 4283drop_write:
4284 mnt_drop_write_file(file);
5d13a37b
AJ		 4285 return ret;
4286}
4287
905b0dda 4288static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4289{
496ad9aa 4290 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4291 struct btrfs_ioctl_qgroup_create_args *sa;
4292 struct btrfs_trans_handle *trans;
4293 int ret;
4294 int err;
4295
4296 if (!capable(CAP_SYS_ADMIN))
4297 return -EPERM;
4298
905b0dda
MX		 4299 ret = mnt_want_write_file(file);
4300 if (ret)
4301 return ret;
5d13a37b
AJ		 4302
4303 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4304 if (IS_ERR(sa)) {
4305 ret = PTR_ERR(sa);
4306 goto drop_write;
4307 }
5d13a37b 4308
d86e56cf
MX		 4309 if (!sa->qgroupid) {
4310 ret = -EINVAL;
4311 goto out;
4312 }
4313
5d13a37b
AJ		 4314 trans = btrfs_join_transaction(root);
4315 if (IS_ERR(trans)) {
4316 ret = PTR_ERR(trans);
4317 goto out;
4318 }
4319
4320 /* FIXME: check if the IDs really exist */
4321 if (sa->create) {
4322 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4323 NULL);
4324 } else {
4325 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4326 }
4327
4328 err = btrfs_end_transaction(trans, root);
4329 if (err && !ret)
4330 ret = err;
4331
4332out:
4333 kfree(sa);
905b0dda
MX		 4334drop_write:
4335 mnt_drop_write_file(file);
5d13a37b
AJ		 4336 return ret;
4337}
4338
905b0dda 4339static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4340{
496ad9aa 4341 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4342 struct btrfs_ioctl_qgroup_limit_args *sa;
4343 struct btrfs_trans_handle *trans;
4344 int ret;
4345 int err;
4346 u64 qgroupid;
4347
4348 if (!capable(CAP_SYS_ADMIN))
4349 return -EPERM;
4350
905b0dda
MX		 4351 ret = mnt_want_write_file(file);
4352 if (ret)
4353 return ret;
5d13a37b
AJ		 4354
4355 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4356 if (IS_ERR(sa)) {
4357 ret = PTR_ERR(sa);
4358 goto drop_write;
4359 }
5d13a37b
AJ		 4360
4361 trans = btrfs_join_transaction(root);
4362 if (IS_ERR(trans)) {
4363 ret = PTR_ERR(trans);
4364 goto out;
4365 }
4366
4367 qgroupid = sa->qgroupid;
4368 if (!qgroupid) {
4369 /* take the current subvol as qgroup */
4370 qgroupid = root->root_key.objectid;
4371 }
4372
4373 /* FIXME: check if the IDs really exist */
4374 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4375
4376 err = btrfs_end_transaction(trans, root);
4377 if (err && !ret)
4378 ret = err;
4379
4380out:
4381 kfree(sa);
905b0dda
MX		 4382drop_write:
4383 mnt_drop_write_file(file);
5d13a37b
AJ		 4384 return ret;
4385}
4386
2f232036
JS		 4387static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4388{
6d0379ec 4389 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4390 struct btrfs_ioctl_quota_rescan_args *qsa;
4391 int ret;
4392
4393 if (!capable(CAP_SYS_ADMIN))
4394 return -EPERM;
4395
4396 ret = mnt_want_write_file(file);
4397 if (ret)
4398 return ret;
4399
4400 qsa = memdup_user(arg, sizeof(*qsa));
4401 if (IS_ERR(qsa)) {
4402 ret = PTR_ERR(qsa);
4403 goto drop_write;
4404 }
4405
4406 if (qsa->flags) {
4407 ret = -EINVAL;
4408 goto out;
4409 }
4410
4411 ret = btrfs_qgroup_rescan(root->fs_info);
4412
4413out:
4414 kfree(qsa);
4415drop_write:
4416 mnt_drop_write_file(file);
4417 return ret;
4418}
4419
4420static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4421{
6d0379ec 4422 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4423 struct btrfs_ioctl_quota_rescan_args *qsa;
4424 int ret = 0;
4425
4426 if (!capable(CAP_SYS_ADMIN))
4427 return -EPERM;
4428
4429 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4430 if (!qsa)
4431 return -ENOMEM;
4432
4433 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4434 qsa->flags = 1;
4435 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4436 }
4437
4438 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4439 ret = -EFAULT;
4440
4441 kfree(qsa);
4442 return ret;
4443}
4444
57254b6e
JS		 4445static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4446{
54563d41 4447 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
57254b6e
JS		 4448
4449 if (!capable(CAP_SYS_ADMIN))
4450 return -EPERM;
4451
4452 return btrfs_qgroup_wait_for_completion(root->fs_info);
4453}
4454
abccd00f
HM		 4455static long _btrfs_ioctl_set_received_subvol(struct file *file,
4456 struct btrfs_ioctl_received_subvol_args *sa)
8ea05e3a 4457{
496ad9aa 4458 struct inode *inode = file_inode(file);
8ea05e3a
AB		 4459 struct btrfs_root *root = BTRFS_I(inode)->root;
4460 struct btrfs_root_item *root_item = &root->root_item;
4461 struct btrfs_trans_handle *trans;
4462 struct timespec ct = CURRENT_TIME;
4463 int ret = 0;
dd5f9615 4464 int received_uuid_changed;
8ea05e3a 4465
bd60ea0f
DS		 4466 if (!inode_owner_or_capable(inode))
4467 return -EPERM;
4468
8ea05e3a
AB		 4469 ret = mnt_want_write_file(file);
4470 if (ret < 0)
4471 return ret;
4472
4473 down_write(&root->fs_info->subvol_sem);
4474
4475 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4476 ret = -EINVAL;
4477 goto out;
4478 }
4479
4480 if (btrfs_root_readonly(root)) {
4481 ret = -EROFS;
4482 goto out;
4483 }
4484
dd5f9615
SB		 4485 /*
4486 * 1 - root item
4487 * 2 - uuid items (received uuid + subvol uuid)
4488 */
4489 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 4490 if (IS_ERR(trans)) {
4491 ret = PTR_ERR(trans);
4492 trans = NULL;
4493 goto out;
4494 }
4495
4496 sa->rtransid = trans->transid;
4497 sa->rtime.sec = ct.tv_sec;
4498 sa->rtime.nsec = ct.tv_nsec;
4499
dd5f9615
SB		 4500 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4501 BTRFS_UUID_SIZE);
4502 if (received_uuid_changed &&
4503 !btrfs_is_empty_uuid(root_item->received_uuid))
4504 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4505 root_item->received_uuid,
4506 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4507 root->root_key.objectid);
8ea05e3a
AB		 4508 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4509 btrfs_set_root_stransid(root_item, sa->stransid);
4510 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 4511 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4512 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4513 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4514 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a
AB		 4515
4516 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4517 &root->root_key, &root->root_item);
4518 if (ret < 0) {
4519 btrfs_end_transaction(trans, root);
8ea05e3a 4520 goto out;
dd5f9615
SB		 4521 }
4522 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4523 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4524 sa->uuid,
4525 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4526 root->root_key.objectid);
4527 if (ret < 0 && ret != -EEXIST) {
4528 btrfs_abort_transaction(trans, root, ret);
8ea05e3a 4529 goto out;
dd5f9615
SB		 4530 }
4531 }
4532 ret = btrfs_commit_transaction(trans, root);
4533 if (ret < 0) {
4534 btrfs_abort_transaction(trans, root, ret);
4535 goto out;
8ea05e3a
AB		 4536 }
4537
abccd00f
HM		 4538out:
4539 up_write(&root->fs_info->subvol_sem);
4540 mnt_drop_write_file(file);
4541 return ret;
4542}
4543
4544#ifdef CONFIG_64BIT
4545static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4546 void __user *arg)
4547{
4548 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4549 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4550 int ret = 0;
4551
4552 args32 = memdup_user(arg, sizeof(*args32));
4553 if (IS_ERR(args32)) {
4554 ret = PTR_ERR(args32);
4555 args32 = NULL;
4556 goto out;
4557 }
4558
4559 args64 = kmalloc(sizeof(*args64), GFP_NOFS);
84dbeb87
DC		 4560 if (!args64) {
4561 ret = -ENOMEM;
abccd00f
HM		 4562 goto out;
4563 }
4564
4565 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4566 args64->stransid = args32->stransid;
4567 args64->rtransid = args32->rtransid;
4568 args64->stime.sec = args32->stime.sec;
4569 args64->stime.nsec = args32->stime.nsec;
4570 args64->rtime.sec = args32->rtime.sec;
4571 args64->rtime.nsec = args32->rtime.nsec;
4572 args64->flags = args32->flags;
4573
4574 ret = _btrfs_ioctl_set_received_subvol(file, args64);
4575 if (ret)
4576 goto out;
4577
4578 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4579 args32->stransid = args64->stransid;
4580 args32->rtransid = args64->rtransid;
4581 args32->stime.sec = args64->stime.sec;
4582 args32->stime.nsec = args64->stime.nsec;
4583 args32->rtime.sec = args64->rtime.sec;
4584 args32->rtime.nsec = args64->rtime.nsec;
4585 args32->flags = args64->flags;
4586
4587 ret = copy_to_user(arg, args32, sizeof(*args32));
4588 if (ret)
4589 ret = -EFAULT;
4590
4591out:
4592 kfree(args32);
4593 kfree(args64);
4594 return ret;
4595}
4596#endif
4597
4598static long btrfs_ioctl_set_received_subvol(struct file *file,
4599 void __user *arg)
4600{
4601 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4602 int ret = 0;
4603
4604 sa = memdup_user(arg, sizeof(*sa));
4605 if (IS_ERR(sa)) {
4606 ret = PTR_ERR(sa);
4607 sa = NULL;
4608 goto out;
4609 }
4610
4611 ret = _btrfs_ioctl_set_received_subvol(file, sa);
4612
4613 if (ret)
4614 goto out;
4615
8ea05e3a
AB		 4616 ret = copy_to_user(arg, sa, sizeof(*sa));
4617 if (ret)
4618 ret = -EFAULT;
4619
4620out:
4621 kfree(sa);
8ea05e3a
AB		 4622 return ret;
4623}
4624
867ab667 4625static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4626{
6d0379ec 4627 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a1b83ac5 4628 size_t len;
867ab667 4629 int ret;
a1b83ac5
AJ		 4630 char label[BTRFS_LABEL_SIZE];
4631
4632 spin_lock(&root->fs_info->super_lock);
4633 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4634 spin_unlock(&root->fs_info->super_lock);
4635
4636 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 4637
4638 if (len == BTRFS_LABEL_SIZE) {
efe120a0
FH		 4639 btrfs_warn(root->fs_info,
4640 "label is too long, return the first %zu bytes", --len);
867ab667 4641 }
4642
867ab667 4643 ret = copy_to_user(arg, label, len);
867ab667 4644
4645 return ret ? -EFAULT : 0;
4646}
4647
a8bfd4ab 4648static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4649{
6d0379ec 4650 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a8bfd4ab 4651 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4652 struct btrfs_trans_handle *trans;
4653 char label[BTRFS_LABEL_SIZE];
4654 int ret;
4655
4656 if (!capable(CAP_SYS_ADMIN))
4657 return -EPERM;
4658
4659 if (copy_from_user(label, arg, sizeof(label)))
4660 return -EFAULT;
4661
4662 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
efe120a0 4663 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
a8bfd4ab 4664 BTRFS_LABEL_SIZE - 1);
4665 return -EINVAL;
4666 }
4667
4668 ret = mnt_want_write_file(file);
4669 if (ret)
4670 return ret;
4671
a8bfd4ab 4672 trans = btrfs_start_transaction(root, 0);
4673 if (IS_ERR(trans)) {
4674 ret = PTR_ERR(trans);
4675 goto out_unlock;
4676 }
4677
a1b83ac5 4678 spin_lock(&root->fs_info->super_lock);
a8bfd4ab 4679 strcpy(super_block->label, label);
a1b83ac5 4680 spin_unlock(&root->fs_info->super_lock);
d0270aca 4681 ret = btrfs_commit_transaction(trans, root);
a8bfd4ab 4682
4683out_unlock:
a8bfd4ab 4684 mnt_drop_write_file(file);
4685 return ret;
4686}
4687
2eaa055f
JM		 4688#define INIT_FEATURE_FLAGS(suffix) \
4689 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4690 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4691 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4692
4693static int btrfs_ioctl_get_supported_features(struct file *file,
4694 void __user *arg)
4695{
4696 static struct btrfs_ioctl_feature_flags features[3] = {
4697 INIT_FEATURE_FLAGS(SUPP),
4698 INIT_FEATURE_FLAGS(SAFE_SET),
4699 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4700 };
4701
4702 if (copy_to_user(arg, &features, sizeof(features)))
4703 return -EFAULT;
4704
4705 return 0;
4706}
4707
4708static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
4709{
4710 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4711 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4712 struct btrfs_ioctl_feature_flags features;
4713
4714 features.compat_flags = btrfs_super_compat_flags(super_block);
4715 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4716 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4717
4718 if (copy_to_user(arg, &features, sizeof(features)))
4719 return -EFAULT;
4720
4721 return 0;
4722}
4723
3b02a68a
JM		 4724static int check_feature_bits(struct btrfs_root *root,
4725 enum btrfs_feature_set set,
2eaa055f
JM		 4726 u64 change_mask, u64 flags, u64 supported_flags,
4727 u64 safe_set, u64 safe_clear)
4728{
3b02a68a
JM		 4729 const char *type = btrfs_feature_set_names[set];
4730 char *names;
2eaa055f
JM		 4731 u64 disallowed, unsupported;
4732 u64 set_mask = flags & change_mask;
4733 u64 clear_mask = ~flags & change_mask;
4734
4735 unsupported = set_mask & ~supported_flags;
4736 if (unsupported) {
3b02a68a
JM		 4737 names = btrfs_printable_features(set, unsupported);
4738 if (names) {
4739 btrfs_warn(root->fs_info,
4740 "this kernel does not support the %s feature bit%s",
4741 names, strchr(names, ',') ? "s" : "");
4742 kfree(names);
4743 } else
4744 btrfs_warn(root->fs_info,
2eaa055f
JM		 4745 "this kernel does not support %s bits 0x%llx",
4746 type, unsupported);
4747 return -EOPNOTSUPP;
4748 }
4749
4750 disallowed = set_mask & ~safe_set;
4751 if (disallowed) {
3b02a68a
JM		 4752 names = btrfs_printable_features(set, disallowed);
4753 if (names) {
4754 btrfs_warn(root->fs_info,
4755 "can't set the %s feature bit%s while mounted",
4756 names, strchr(names, ',') ? "s" : "");
4757 kfree(names);
4758 } else
4759 btrfs_warn(root->fs_info,
2eaa055f
JM		 4760 "can't set %s bits 0x%llx while mounted",
4761 type, disallowed);
4762 return -EPERM;
4763 }
4764
4765 disallowed = clear_mask & ~safe_clear;
4766 if (disallowed) {
3b02a68a
JM		 4767 names = btrfs_printable_features(set, disallowed);
4768 if (names) {
4769 btrfs_warn(root->fs_info,
4770 "can't clear the %s feature bit%s while mounted",
4771 names, strchr(names, ',') ? "s" : "");
4772 kfree(names);
4773 } else
4774 btrfs_warn(root->fs_info,
2eaa055f
JM		 4775 "can't clear %s bits 0x%llx while mounted",
4776 type, disallowed);
4777 return -EPERM;
4778 }
4779
4780 return 0;
4781}
4782
4783#define check_feature(root, change_mask, flags, mask_base) \
3b02a68a 4784check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
2eaa055f
JM		 4785 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4786 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4787 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4788
4789static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4790{
4791 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4792 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4793 struct btrfs_ioctl_feature_flags flags[2];
4794 struct btrfs_trans_handle *trans;
4795 u64 newflags;
4796 int ret;
4797
4798 if (!capable(CAP_SYS_ADMIN))
4799 return -EPERM;
4800
4801 if (copy_from_user(flags, arg, sizeof(flags)))
4802 return -EFAULT;
4803
4804 /* Nothing to do */
4805 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4806 !flags[0].incompat_flags)
4807 return 0;
4808
4809 ret = check_feature(root, flags[0].compat_flags,
4810 flags[1].compat_flags, COMPAT);
4811 if (ret)
4812 return ret;
4813
4814 ret = check_feature(root, flags[0].compat_ro_flags,
4815 flags[1].compat_ro_flags, COMPAT_RO);
4816 if (ret)
4817 return ret;
4818
4819 ret = check_feature(root, flags[0].incompat_flags,
4820 flags[1].incompat_flags, INCOMPAT);
4821 if (ret)
4822 return ret;
4823
8051aa1a 4824 trans = btrfs_start_transaction(root, 0);
2eaa055f
JM		 4825 if (IS_ERR(trans))
4826 return PTR_ERR(trans);
4827
4828 spin_lock(&root->fs_info->super_lock);
4829 newflags = btrfs_super_compat_flags(super_block);
4830 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4831 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4832 btrfs_set_super_compat_flags(super_block, newflags);
4833
4834 newflags = btrfs_super_compat_ro_flags(super_block);
4835 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4836 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4837 btrfs_set_super_compat_ro_flags(super_block, newflags);
4838
4839 newflags = btrfs_super_incompat_flags(super_block);
4840 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4841 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4842 btrfs_set_super_incompat_flags(super_block, newflags);
4843 spin_unlock(&root->fs_info->super_lock);
4844
d0270aca 4845 return btrfs_commit_transaction(trans, root);
2eaa055f
JM		 4846}
4847
f46b5a66
CH		 4848long btrfs_ioctl(struct file *file, unsigned int
4849 cmd, unsigned long arg)
4850{
496ad9aa 4851 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4bcabaa3 4852 void __user *argp = (void __user *)arg;
f46b5a66
CH		 4853
4854 switch (cmd) {
6cbff00f
CH		 4855 case FS_IOC_GETFLAGS:
4856 return btrfs_ioctl_getflags(file, argp);
4857 case FS_IOC_SETFLAGS:
4858 return btrfs_ioctl_setflags(file, argp);
4859 case FS_IOC_GETVERSION:
4860 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 4861 case FITRIM:
4862 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 4863 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 4864 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 4865 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 4866 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 4867 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 4868 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 4869 case BTRFS_IOC_SUBVOL_CREATE_V2:
4870 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 4871 case BTRFS_IOC_SNAP_DESTROY:
4872 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 4873 case BTRFS_IOC_SUBVOL_GETFLAGS:
4874 return btrfs_ioctl_subvol_getflags(file, argp);
4875 case BTRFS_IOC_SUBVOL_SETFLAGS:
4876 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 4877 case BTRFS_IOC_DEFAULT_SUBVOL:
4878 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 4879 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 4880 return btrfs_ioctl_defrag(file, NULL);
4881 case BTRFS_IOC_DEFRAG_RANGE:
4882 return btrfs_ioctl_defrag(file, argp);
f46b5a66 4883 case BTRFS_IOC_RESIZE:
198605a8 4884 return btrfs_ioctl_resize(file, argp);
f46b5a66 4885 case BTRFS_IOC_ADD_DEV:
4bcabaa3 4886 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 4887 case BTRFS_IOC_RM_DEV:
da24927b 4888 return btrfs_ioctl_rm_dev(file, argp);
475f6387
JS		 4889 case BTRFS_IOC_FS_INFO:
4890 return btrfs_ioctl_fs_info(root, argp);
4891 case BTRFS_IOC_DEV_INFO:
4892 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 4893 case BTRFS_IOC_BALANCE:
9ba1f6e4 4894 return btrfs_ioctl_balance(file, NULL);
f46b5a66 4895 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 4896 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4897 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 4898 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 4899 case BTRFS_IOC_TRANS_START:
4900 return btrfs_ioctl_trans_start(file);
4901 case BTRFS_IOC_TRANS_END:
4902 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 4903 case BTRFS_IOC_TREE_SEARCH:
4904 return btrfs_ioctl_tree_search(file, argp);
4905 case BTRFS_IOC_INO_LOOKUP:
4906 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 4907 case BTRFS_IOC_INO_PATHS:
4908 return btrfs_ioctl_ino_to_path(root, argp);
4909 case BTRFS_IOC_LOGICAL_INO:
4910 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 4911 case BTRFS_IOC_SPACE_INFO:
4912 return btrfs_ioctl_space_info(root, argp);
9b199859
FDBM		 4913 case BTRFS_IOC_SYNC: {
4914 int ret;
4915
6c255e67 4916 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
9b199859
FDBM		 4917 if (ret)
4918 return ret;
4919 ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
4920 return ret;
4921 }
46204592 4922 case BTRFS_IOC_START_SYNC:
9a8c28be 4923 return btrfs_ioctl_start_sync(root, argp);
46204592 4924 case BTRFS_IOC_WAIT_SYNC:
9a8c28be 4925 return btrfs_ioctl_wait_sync(root, argp);
475f6387 4926 case BTRFS_IOC_SCRUB:
b8e95489 4927 return btrfs_ioctl_scrub(file, argp);
475f6387
JS		 4928 case BTRFS_IOC_SCRUB_CANCEL:
4929 return btrfs_ioctl_scrub_cancel(root, argp);
4930 case BTRFS_IOC_SCRUB_PROGRESS:
4931 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 4932 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 4933 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 4934 case BTRFS_IOC_BALANCE_CTL:
4935 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 4936 case BTRFS_IOC_BALANCE_PROGRESS:
4937 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 4938 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4939 return btrfs_ioctl_set_received_subvol(file, argp);
abccd00f
HM		 4940#ifdef CONFIG_64BIT
4941 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
4942 return btrfs_ioctl_set_received_subvol_32(file, argp);
4943#endif
31db9f7c
AB		 4944 case BTRFS_IOC_SEND:
4945 return btrfs_ioctl_send(file, argp);
c11d2c23 4946 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 4947 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b 4948 case BTRFS_IOC_QUOTA_CTL:
905b0dda 4949 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 4950 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 4951 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 4952 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 4953 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 4954 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 4955 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 4956 case BTRFS_IOC_QUOTA_RESCAN:
4957 return btrfs_ioctl_quota_rescan(file, argp);
4958 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4959 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 4960 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4961 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd
SB		 4962 case BTRFS_IOC_DEV_REPLACE:
4963 return btrfs_ioctl_dev_replace(root, argp);
867ab667 4964 case BTRFS_IOC_GET_FSLABEL:
4965 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 4966 case BTRFS_IOC_SET_FSLABEL:
4967 return btrfs_ioctl_set_fslabel(file, argp);
416161db
MF		 4968 case BTRFS_IOC_FILE_EXTENT_SAME:
4969 return btrfs_ioctl_file_extent_same(file, argp);
2eaa055f
JM		 4970 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4971 return btrfs_ioctl_get_supported_features(file, argp);
4972 case BTRFS_IOC_GET_FEATURES:
4973 return btrfs_ioctl_get_features(file, argp);
4974 case BTRFS_IOC_SET_FEATURES:
4975 return btrfs_ioctl_set_features(file, argp);
f46b5a66
CH		 4976 }
4977
4978 return -ENOTTY;
4979}
Arne's tree of linux kernel.