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Btrfs: set right total device count for seeding support
[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"
fcebe456 61#include "qgroup.h"
f46b5a66 62
abccd00f
HM		 63#ifdef CONFIG_64BIT
64/* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
65 * structures are incorrect, as the timespec structure from userspace
66 * is 4 bytes too small. We define these alternatives here to teach
67 * the kernel about the 32-bit struct packing.
68 */
69struct btrfs_ioctl_timespec_32 {
70 __u64 sec;
71 __u32 nsec;
72} __attribute__ ((__packed__));
73
74struct btrfs_ioctl_received_subvol_args_32 {
75 char uuid[BTRFS_UUID_SIZE]; /* in */
76 __u64 stransid; /* in */
77 __u64 rtransid; /* out */
78 struct btrfs_ioctl_timespec_32 stime; /* in */
79 struct btrfs_ioctl_timespec_32 rtime; /* out */
80 __u64 flags; /* in */
81 __u64 reserved[16]; /* in */
82} __attribute__ ((__packed__));
83
84#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
85 struct btrfs_ioctl_received_subvol_args_32)
86#endif
87
88
416161db
MF		 89static int btrfs_clone(struct inode *src, struct inode *inode,
90 u64 off, u64 olen, u64 olen_aligned, u64 destoff);
91
6cbff00f
CH		 92/* Mask out flags that are inappropriate for the given type of inode. */
93static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
94{
95 if (S_ISDIR(mode))
96 return flags;
97 else if (S_ISREG(mode))
98 return flags & ~FS_DIRSYNC_FL;
99 else
100 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
101}
102
103/*
104 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
105 */
106static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
107{
108 unsigned int iflags = 0;
109
110 if (flags & BTRFS_INODE_SYNC)
111 iflags |= FS_SYNC_FL;
112 if (flags & BTRFS_INODE_IMMUTABLE)
113 iflags |= FS_IMMUTABLE_FL;
114 if (flags & BTRFS_INODE_APPEND)
115 iflags |= FS_APPEND_FL;
116 if (flags & BTRFS_INODE_NODUMP)
117 iflags |= FS_NODUMP_FL;
118 if (flags & BTRFS_INODE_NOATIME)
119 iflags |= FS_NOATIME_FL;
120 if (flags & BTRFS_INODE_DIRSYNC)
121 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 122 if (flags & BTRFS_INODE_NODATACOW)
123 iflags |= FS_NOCOW_FL;
124
125 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
126 iflags |= FS_COMPR_FL;
127 else if (flags & BTRFS_INODE_NOCOMPRESS)
128 iflags |= FS_NOCOMP_FL;
6cbff00f
CH		 129
130 return iflags;
131}
132
133/*
134 * Update inode->i_flags based on the btrfs internal flags.
135 */
136void btrfs_update_iflags(struct inode *inode)
137{
138 struct btrfs_inode *ip = BTRFS_I(inode);
139
140 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
141
142 if (ip->flags & BTRFS_INODE_SYNC)
143 inode->i_flags |= S_SYNC;
144 if (ip->flags & BTRFS_INODE_IMMUTABLE)
145 inode->i_flags |= S_IMMUTABLE;
146 if (ip->flags & BTRFS_INODE_APPEND)
147 inode->i_flags |= S_APPEND;
148 if (ip->flags & BTRFS_INODE_NOATIME)
149 inode->i_flags |= S_NOATIME;
150 if (ip->flags & BTRFS_INODE_DIRSYNC)
151 inode->i_flags |= S_DIRSYNC;
152}
153
154/*
155 * Inherit flags from the parent inode.
156 *
e27425d6 157 * Currently only the compression flags and the cow flags are inherited.
6cbff00f
CH		 158 */
159void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
160{
0b4dcea5
CM		 161 unsigned int flags;
162
163 if (!dir)
164 return;
165
166 flags = BTRFS_I(dir)->flags;
6cbff00f 167
e27425d6
JB		 168 if (flags & BTRFS_INODE_NOCOMPRESS) {
169 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
170 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
171 } else if (flags & BTRFS_INODE_COMPRESS) {
172 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
173 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
174 }
175
213490b3 176 if (flags & BTRFS_INODE_NODATACOW) {
e27425d6 177 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
213490b3
LB		 178 if (S_ISREG(inode->i_mode))
179 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
180 }
6cbff00f 181
6cbff00f
CH		 182 btrfs_update_iflags(inode);
183}
184
185static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
186{
496ad9aa 187 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
6cbff00f
CH		 188 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
189
190 if (copy_to_user(arg, &flags, sizeof(flags)))
191 return -EFAULT;
192 return 0;
193}
194
75e7cb7f
LB		 195static int check_flags(unsigned int flags)
196{
197 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
198 FS_NOATIME_FL | FS_NODUMP_FL | \
199 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 200 FS_NOCOMP_FL | FS_COMPR_FL |
201 FS_NOCOW_FL))
75e7cb7f
LB		 202 return -EOPNOTSUPP;
203
204 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
205 return -EINVAL;
206
75e7cb7f
LB		 207 return 0;
208}
209
6cbff00f
CH		 210static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
211{
496ad9aa 212 struct inode *inode = file_inode(file);
6cbff00f
CH		 213 struct btrfs_inode *ip = BTRFS_I(inode);
214 struct btrfs_root *root = ip->root;
215 struct btrfs_trans_handle *trans;
216 unsigned int flags, oldflags;
217 int ret;
f062abf0
LZ		 218 u64 ip_oldflags;
219 unsigned int i_oldflags;
7e97b8da 220 umode_t mode;
6cbff00f 221
bd60ea0f
DS		 222 if (!inode_owner_or_capable(inode))
223 return -EPERM;
224
b83cc969
LZ		 225 if (btrfs_root_readonly(root))
226 return -EROFS;
227
6cbff00f
CH		 228 if (copy_from_user(&flags, arg, sizeof(flags)))
229 return -EFAULT;
230
75e7cb7f
LB		 231 ret = check_flags(flags);
232 if (ret)
233 return ret;
f46b5a66 234
e7848683
JK		 235 ret = mnt_want_write_file(file);
236 if (ret)
237 return ret;
238
6cbff00f
CH		 239 mutex_lock(&inode->i_mutex);
240
f062abf0
LZ		 241 ip_oldflags = ip->flags;
242 i_oldflags = inode->i_flags;
7e97b8da 243 mode = inode->i_mode;
f062abf0 244
6cbff00f
CH		 245 flags = btrfs_mask_flags(inode->i_mode, flags);
246 oldflags = btrfs_flags_to_ioctl(ip->flags);
247 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
248 if (!capable(CAP_LINUX_IMMUTABLE)) {
249 ret = -EPERM;
250 goto out_unlock;
251 }
252 }
253
6cbff00f
CH		 254 if (flags & FS_SYNC_FL)
255 ip->flags |= BTRFS_INODE_SYNC;
256 else
257 ip->flags &= ~BTRFS_INODE_SYNC;
258 if (flags & FS_IMMUTABLE_FL)
259 ip->flags |= BTRFS_INODE_IMMUTABLE;
260 else
261 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
262 if (flags & FS_APPEND_FL)
263 ip->flags |= BTRFS_INODE_APPEND;
264 else
265 ip->flags &= ~BTRFS_INODE_APPEND;
266 if (flags & FS_NODUMP_FL)
267 ip->flags |= BTRFS_INODE_NODUMP;
268 else
269 ip->flags &= ~BTRFS_INODE_NODUMP;
270 if (flags & FS_NOATIME_FL)
271 ip->flags |= BTRFS_INODE_NOATIME;
272 else
273 ip->flags &= ~BTRFS_INODE_NOATIME;
274 if (flags & FS_DIRSYNC_FL)
275 ip->flags |= BTRFS_INODE_DIRSYNC;
276 else
277 ip->flags &= ~BTRFS_INODE_DIRSYNC;
7e97b8da
DS		 278 if (flags & FS_NOCOW_FL) {
279 if (S_ISREG(mode)) {
280 /*
281 * It's safe to turn csums off here, no extents exist.
282 * Otherwise we want the flag to reflect the real COW
283 * status of the file and will not set it.
284 */
285 if (inode->i_size == 0)
286 ip->flags |= BTRFS_INODE_NODATACOW
287 | BTRFS_INODE_NODATASUM;
288 } else {
289 ip->flags |= BTRFS_INODE_NODATACOW;
290 }
291 } else {
292 /*
293 * Revert back under same assuptions as above
294 */
295 if (S_ISREG(mode)) {
296 if (inode->i_size == 0)
297 ip->flags &= ~(BTRFS_INODE_NODATACOW
298 | BTRFS_INODE_NODATASUM);
299 } else {
300 ip->flags &= ~BTRFS_INODE_NODATACOW;
301 }
302 }
6cbff00f 303
75e7cb7f
LB		 304 /*
305 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
306 * flag may be changed automatically if compression code won't make
307 * things smaller.
308 */
309 if (flags & FS_NOCOMP_FL) {
310 ip->flags &= ~BTRFS_INODE_COMPRESS;
311 ip->flags |= BTRFS_INODE_NOCOMPRESS;
63541927
FDBM		 312
313 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
314 if (ret && ret != -ENODATA)
315 goto out_drop;
75e7cb7f 316 } else if (flags & FS_COMPR_FL) {
63541927
FDBM		 317 const char *comp;
318
75e7cb7f
LB		 319 ip->flags |= BTRFS_INODE_COMPRESS;
320 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
63541927
FDBM		 321
322 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
323 comp = "lzo";
324 else
325 comp = "zlib";
326 ret = btrfs_set_prop(inode, "btrfs.compression",
327 comp, strlen(comp), 0);
328 if (ret)
329 goto out_drop;
330
ebcb904d
LZ		 331 } else {
332 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 333 }
6cbff00f 334
4da6f1a3 335 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 336 if (IS_ERR(trans)) {
337 ret = PTR_ERR(trans);
338 goto out_drop;
339 }
6cbff00f 340
306424cc 341 btrfs_update_iflags(inode);
0c4d2d95 342 inode_inc_iversion(inode);
306424cc 343 inode->i_ctime = CURRENT_TIME;
6cbff00f 344 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 345
6cbff00f 346 btrfs_end_transaction(trans, root);
f062abf0
LZ		 347 out_drop:
348 if (ret) {
349 ip->flags = ip_oldflags;
350 inode->i_flags = i_oldflags;
351 }
6cbff00f 352
6cbff00f
CH		 353 out_unlock:
354 mutex_unlock(&inode->i_mutex);
e7848683 355 mnt_drop_write_file(file);
2d4e6f6a 356 return ret;
6cbff00f
CH		 357}
358
359static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
360{
496ad9aa 361 struct inode *inode = file_inode(file);
6cbff00f
CH		 362
363 return put_user(inode->i_generation, arg);
364}
f46b5a66 365
f7039b1d
LD		 366static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
367{
54563d41 368 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
f7039b1d
LD		 369 struct btrfs_device *device;
370 struct request_queue *q;
371 struct fstrim_range range;
372 u64 minlen = ULLONG_MAX;
373 u64 num_devices = 0;
815745cf 374 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
f7039b1d
LD		 375 int ret;
376
377 if (!capable(CAP_SYS_ADMIN))
378 return -EPERM;
379
1f78160c
XG		 380 rcu_read_lock();
381 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
382 dev_list) {
f7039b1d
LD		 383 if (!device->bdev)
384 continue;
385 q = bdev_get_queue(device->bdev);
386 if (blk_queue_discard(q)) {
387 num_devices++;
388 minlen = min((u64)q->limits.discard_granularity,
389 minlen);
390 }
391 }
1f78160c 392 rcu_read_unlock();
f4c697e6 393
f7039b1d
LD		 394 if (!num_devices)
395 return -EOPNOTSUPP;
f7039b1d
LD		 396 if (copy_from_user(&range, arg, sizeof(range)))
397 return -EFAULT;
e515c18b
LC		 398 if (range.start > total_bytes ||
399 range.len < fs_info->sb->s_blocksize)
f4c697e6 400 return -EINVAL;
f7039b1d 401
f4c697e6 402 range.len = min(range.len, total_bytes - range.start);
f7039b1d 403 range.minlen = max(range.minlen, minlen);
815745cf 404 ret = btrfs_trim_fs(fs_info->tree_root, &range);
f7039b1d
LD		 405 if (ret < 0)
406 return ret;
407
408 if (copy_to_user(arg, &range, sizeof(range)))
409 return -EFAULT;
410
411 return 0;
412}
413
dd5f9615
SB		 414int btrfs_is_empty_uuid(u8 *uuid)
415{
46e0f66a
CM		 416 int i;
417
418 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
419 if (uuid[i])
420 return 0;
421 }
422 return 1;
dd5f9615
SB		 423}
424
d5c12070 425static noinline int create_subvol(struct inode *dir,
cb8e7090 426 struct dentry *dentry,
72fd032e 427 char *name, int namelen,
6f72c7e2 428 u64 *async_transid,
8696c533 429 struct btrfs_qgroup_inherit *inherit)
f46b5a66
CH		 430{
431 struct btrfs_trans_handle *trans;
432 struct btrfs_key key;
433 struct btrfs_root_item root_item;
434 struct btrfs_inode_item *inode_item;
435 struct extent_buffer *leaf;
d5c12070 436 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 437 struct btrfs_root *new_root;
d5c12070 438 struct btrfs_block_rsv block_rsv;
8ea05e3a 439 struct timespec cur_time = CURRENT_TIME;
5662344b 440 struct inode *inode;
f46b5a66
CH		 441 int ret;
442 int err;
443 u64 objectid;
444 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 445 u64 index = 0;
d5c12070 446 u64 qgroup_reserved;
8ea05e3a 447 uuid_le new_uuid;
f46b5a66 448
581bb050 449 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
2fbe8c8a 450 if (ret)
a22285a6 451 return ret;
6a912213 452
d5c12070 453 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 454 /*
d5c12070
MX		 455 * The same as the snapshot creation, please see the comment
456 * of create_snapshot().
9ed74f2d 457 */
d5c12070 458 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
dd5f9615 459 8, &qgroup_reserved, false);
d5c12070
MX		 460 if (ret)
461 return ret;
462
463 trans = btrfs_start_transaction(root, 0);
464 if (IS_ERR(trans)) {
465 ret = PTR_ERR(trans);
de6e8200
LB		 466 btrfs_subvolume_release_metadata(root, &block_rsv,
467 qgroup_reserved);
468 return ret;
d5c12070
MX		 469 }
470 trans->block_rsv = &block_rsv;
471 trans->bytes_reserved = block_rsv.size;
f46b5a66 472
8696c533 473 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
6f72c7e2
AJ		 474 if (ret)
475 goto fail;
476
5d4f98a2 477 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
5581a51a 478 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 479 if (IS_ERR(leaf)) {
480 ret = PTR_ERR(leaf);
481 goto fail;
482 }
f46b5a66 483
5d4f98a2 484 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
f46b5a66
CH		 485 btrfs_set_header_bytenr(leaf, leaf->start);
486 btrfs_set_header_generation(leaf, trans->transid);
5d4f98a2 487 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
f46b5a66
CH		 488 btrfs_set_header_owner(leaf, objectid);
489
0a4e5586 490 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
f46b5a66 491 BTRFS_FSID_SIZE);
5d4f98a2 492 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
b308bc2f 493 btrfs_header_chunk_tree_uuid(leaf),
5d4f98a2 494 BTRFS_UUID_SIZE);
f46b5a66
CH		 495 btrfs_mark_buffer_dirty(leaf);
496
8ea05e3a
AB		 497 memset(&root_item, 0, sizeof(root_item));
498
f46b5a66 499 inode_item = &root_item.inode;
3cae210f
QW		 500 btrfs_set_stack_inode_generation(inode_item, 1);
501 btrfs_set_stack_inode_size(inode_item, 3);
502 btrfs_set_stack_inode_nlink(inode_item, 1);
503 btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
504 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
f46b5a66 505
3cae210f
QW		 506 btrfs_set_root_flags(&root_item, 0);
507 btrfs_set_root_limit(&root_item, 0);
508 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
08fe4db1 509
f46b5a66 510 btrfs_set_root_bytenr(&root_item, leaf->start);
84234f3a 511 btrfs_set_root_generation(&root_item, trans->transid);
f46b5a66
CH		 512 btrfs_set_root_level(&root_item, 0);
513 btrfs_set_root_refs(&root_item, 1);
86b9f2ec 514 btrfs_set_root_used(&root_item, leaf->len);
80ff3856 515 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66 516
8ea05e3a
AB		 517 btrfs_set_root_generation_v2(&root_item,
518 btrfs_root_generation(&root_item));
519 uuid_le_gen(&new_uuid);
520 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
3cae210f
QW		 521 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
522 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
8ea05e3a
AB		 523 root_item.ctime = root_item.otime;
524 btrfs_set_root_ctransid(&root_item, trans->transid);
525 btrfs_set_root_otransid(&root_item, trans->transid);
f46b5a66 526
925baedd 527 btrfs_tree_unlock(leaf);
f46b5a66
CH		 528 free_extent_buffer(leaf);
529 leaf = NULL;
530
531 btrfs_set_root_dirid(&root_item, new_dirid);
532
533 key.objectid = objectid;
5d4f98a2 534 key.offset = 0;
f46b5a66
CH		 535 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
536 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
537 &root_item);
538 if (ret)
539 goto fail;
540
76dda93c
YZ		 541 key.offset = (u64)-1;
542 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
79787eaa
JM		 543 if (IS_ERR(new_root)) {
544 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
545 ret = PTR_ERR(new_root);
546 goto fail;
547 }
76dda93c
YZ		 548
549 btrfs_record_root_in_trans(trans, new_root);
550
63541927 551 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
ce598979
MF		 552 if (ret) {
553 /* We potentially lose an unused inode item here */
79787eaa 554 btrfs_abort_transaction(trans, root, ret);
ce598979
MF		 555 goto fail;
556 }
557
f46b5a66
CH		 558 /*
559 * insert the directory item
560 */
3de4586c 561 ret = btrfs_set_inode_index(dir, &index);
79787eaa
JM		 562 if (ret) {
563 btrfs_abort_transaction(trans, root, ret);
564 goto fail;
565 }
3de4586c
CM		 566
567 ret = btrfs_insert_dir_item(trans, root,
16cdcec7 568 name, namelen, dir, &key,
3de4586c 569 BTRFS_FT_DIR, index);
79787eaa
JM		 570 if (ret) {
571 btrfs_abort_transaction(trans, root, ret);
f46b5a66 572 goto fail;
79787eaa 573 }
0660b5af 574
52c26179
YZ		 575 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
576 ret = btrfs_update_inode(trans, root, dir);
577 BUG_ON(ret);
578
0660b5af 579 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4df27c4d 580 objectid, root->root_key.objectid,
33345d01 581 btrfs_ino(dir), index, name, namelen);
76dda93c 582 BUG_ON(ret);
f46b5a66 583
dd5f9615
SB		 584 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
585 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
586 objectid);
587 if (ret)
588 btrfs_abort_transaction(trans, root, ret);
589
f46b5a66 590fail:
d5c12070
MX		 591 trans->block_rsv = NULL;
592 trans->bytes_reserved = 0;
de6e8200
LB		 593 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
594
72fd032e
SW		 595 if (async_transid) {
596 *async_transid = trans->transid;
597 err = btrfs_commit_transaction_async(trans, root, 1);
00d71c9c
MX		 598 if (err)
599 err = btrfs_commit_transaction(trans, root);
72fd032e
SW		 600 } else {
601 err = btrfs_commit_transaction(trans, root);
602 }
f46b5a66
CH		 603 if (err && !ret)
604 ret = err;
1a65e24b 605
5662344b
TI		 606 if (!ret) {
607 inode = btrfs_lookup_dentry(dir, dentry);
de6e8200
LB		 608 if (IS_ERR(inode))
609 return PTR_ERR(inode);
5662344b
TI		 610 d_instantiate(dentry, inode);
611 }
f46b5a66
CH		 612 return ret;
613}
614
8257b2dc
MX		 615static void btrfs_wait_nocow_write(struct btrfs_root *root)
616{
617 s64 writers;
618 DEFINE_WAIT(wait);
619
620 do {
621 prepare_to_wait(&root->subv_writers->wait, &wait,
622 TASK_UNINTERRUPTIBLE);
623
624 writers = percpu_counter_sum(&root->subv_writers->counter);
625 if (writers)
626 schedule();
627
628 finish_wait(&root->subv_writers->wait, &wait);
629 } while (writers);
630}
631
e9662f70
MX		 632static int create_snapshot(struct btrfs_root *root, struct inode *dir,
633 struct dentry *dentry, char *name, int namelen,
634 u64 *async_transid, bool readonly,
635 struct btrfs_qgroup_inherit *inherit)
f46b5a66 636{
2e4bfab9 637 struct inode *inode;
f46b5a66
CH		 638 struct btrfs_pending_snapshot *pending_snapshot;
639 struct btrfs_trans_handle *trans;
2e4bfab9 640 int ret;
f46b5a66 641
27cdeb70 642 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
f46b5a66
CH		 643 return -EINVAL;
644
8257b2dc
MX		 645 atomic_inc(&root->will_be_snapshoted);
646 smp_mb__after_atomic_inc();
647 btrfs_wait_nocow_write(root);
648
6a03843d
MX		 649 ret = btrfs_start_delalloc_inodes(root, 0);
650 if (ret)
8257b2dc 651 goto out;
6a03843d 652
b0244199 653 btrfs_wait_ordered_extents(root, -1);
6a03843d 654
3de4586c 655 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
8257b2dc
MX		 656 if (!pending_snapshot) {
657 ret = -ENOMEM;
658 goto out;
659 }
a22285a6 660
66d8f3dd
MX		 661 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
662 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 663 /*
664 * 1 - parent dir inode
665 * 2 - dir entries
666 * 1 - root item
667 * 2 - root ref/backref
668 * 1 - root of snapshot
dd5f9615 669 * 1 - UUID item
d5c12070
MX		 670 */
671 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
dd5f9615 672 &pending_snapshot->block_rsv, 8,
ee3441b4
JM		 673 &pending_snapshot->qgroup_reserved,
674 false);
d5c12070 675 if (ret)
8257b2dc 676 goto free;
d5c12070 677
3de4586c 678 pending_snapshot->dentry = dentry;
f46b5a66 679 pending_snapshot->root = root;
b83cc969 680 pending_snapshot->readonly = readonly;
e9662f70 681 pending_snapshot->dir = dir;
8696c533 682 pending_snapshot->inherit = inherit;
a22285a6 683
d5c12070 684 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 685 if (IS_ERR(trans)) {
686 ret = PTR_ERR(trans);
687 goto fail;
688 }
689
8351583e 690 spin_lock(&root->fs_info->trans_lock);
f46b5a66
CH		 691 list_add(&pending_snapshot->list,
692 &trans->transaction->pending_snapshots);
8351583e 693 spin_unlock(&root->fs_info->trans_lock);
72fd032e
SW		 694 if (async_transid) {
695 *async_transid = trans->transid;
696 ret = btrfs_commit_transaction_async(trans,
697 root->fs_info->extent_root, 1);
00d71c9c
MX		 698 if (ret)
699 ret = btrfs_commit_transaction(trans, root);
72fd032e
SW		 700 } else {
701 ret = btrfs_commit_transaction(trans,
702 root->fs_info->extent_root);
703 }
aec8030a 704 if (ret)
c37b2b62 705 goto fail;
a22285a6
YZ		 706
707 ret = pending_snapshot->error;
708 if (ret)
709 goto fail;
710
66b4ffd1
JB		 711 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
712 if (ret)
713 goto fail;
f46b5a66 714
2fbe8c8a 715 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 716 if (IS_ERR(inode)) {
717 ret = PTR_ERR(inode);
718 goto fail;
719 }
5662344b 720
2e4bfab9
YZ		 721 d_instantiate(dentry, inode);
722 ret = 0;
723fail:
d5c12070
MX		 724 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
725 &pending_snapshot->block_rsv,
726 pending_snapshot->qgroup_reserved);
8257b2dc 727free:
a22285a6 728 kfree(pending_snapshot);
8257b2dc
MX		 729out:
730 atomic_dec(&root->will_be_snapshoted);
f46b5a66
CH		 731 return ret;
732}
733
4260f7c7
SW		 734/* copy of check_sticky in fs/namei.c()
735* It's inline, so penalty for filesystems that don't use sticky bit is
736* minimal.
737*/
738static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
739{
2f2f43d3 740 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 741
742 if (!(dir->i_mode & S_ISVTX))
743 return 0;
2f2f43d3 744 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 745 return 0;
2f2f43d3 746 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 747 return 0;
748 return !capable(CAP_FOWNER);
749}
750
751/* copy of may_delete in fs/namei.c()
752 * Check whether we can remove a link victim from directory dir, check
753 * whether the type of victim is right.
754 * 1. We can't do it if dir is read-only (done in permission())
755 * 2. We should have write and exec permissions on dir
756 * 3. We can't remove anything from append-only dir
757 * 4. We can't do anything with immutable dir (done in permission())
758 * 5. If the sticky bit on dir is set we should either
759 * a. be owner of dir, or
760 * b. be owner of victim, or
761 * c. have CAP_FOWNER capability
762 * 6. If the victim is append-only or immutable we can't do antyhing with
763 * links pointing to it.
764 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
765 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
766 * 9. We can't remove a root or mountpoint.
767 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
768 * nfs_async_unlink().
769 */
770
67871254 771static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
4260f7c7
SW		 772{
773 int error;
774
775 if (!victim->d_inode)
776 return -ENOENT;
777
778 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 779 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 780
781 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
782 if (error)
783 return error;
784 if (IS_APPEND(dir))
785 return -EPERM;
786 if (btrfs_check_sticky(dir, victim->d_inode)||
787 IS_APPEND(victim->d_inode)||
788 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
789 return -EPERM;
790 if (isdir) {
791 if (!S_ISDIR(victim->d_inode->i_mode))
792 return -ENOTDIR;
793 if (IS_ROOT(victim))
794 return -EBUSY;
795 } else if (S_ISDIR(victim->d_inode->i_mode))
796 return -EISDIR;
797 if (IS_DEADDIR(dir))
798 return -ENOENT;
799 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
800 return -EBUSY;
801 return 0;
802}
803
cb8e7090
CH		 804/* copy of may_create in fs/namei.c() */
805static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
806{
807 if (child->d_inode)
808 return -EEXIST;
809 if (IS_DEADDIR(dir))
810 return -ENOENT;
811 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
812}
813
814/*
815 * Create a new subvolume below @parent. This is largely modeled after
816 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
817 * inside this filesystem so it's quite a bit simpler.
818 */
76dda93c
YZ		 819static noinline int btrfs_mksubvol(struct path *parent,
820 char *name, int namelen,
72fd032e 821 struct btrfs_root *snap_src,
6f72c7e2 822 u64 *async_transid, bool readonly,
8696c533 823 struct btrfs_qgroup_inherit *inherit)
cb8e7090 824{
76dda93c 825 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 826 struct dentry *dentry;
827 int error;
828
5c50c9b8
DS		 829 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
830 if (error == -EINTR)
831 return error;
cb8e7090
CH		 832
833 dentry = lookup_one_len(name, parent->dentry, namelen);
834 error = PTR_ERR(dentry);
835 if (IS_ERR(dentry))
836 goto out_unlock;
837
838 error = -EEXIST;
839 if (dentry->d_inode)
840 goto out_dput;
841
76dda93c 842 error = btrfs_may_create(dir, dentry);
cb8e7090 843 if (error)
a874a63e 844 goto out_dput;
cb8e7090 845
9c52057c
CM		 846 /*
847 * even if this name doesn't exist, we may get hash collisions.
848 * check for them now when we can safely fail
849 */
850 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
851 dir->i_ino, name,
852 namelen);
853 if (error)
854 goto out_dput;
855
76dda93c
YZ		 856 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
857
858 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
859 goto out_up_read;
860
3de4586c 861 if (snap_src) {
e9662f70 862 error = create_snapshot(snap_src, dir, dentry, name, namelen,
6f72c7e2 863 async_transid, readonly, inherit);
3de4586c 864 } else {
d5c12070
MX		 865 error = create_subvol(dir, dentry, name, namelen,
866 async_transid, inherit);
3de4586c 867 }
76dda93c
YZ		 868 if (!error)
869 fsnotify_mkdir(dir, dentry);
870out_up_read:
871 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 872out_dput:
873 dput(dentry);
874out_unlock:
76dda93c 875 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 876 return error;
877}
878
4cb5300b
CM		 879/*
880 * When we're defragging a range, we don't want to kick it off again
881 * if it is really just waiting for delalloc to send it down.
882 * If we find a nice big extent or delalloc range for the bytes in the
883 * file you want to defrag, we return 0 to let you know to skip this
884 * part of the file
885 */
886static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
887{
888 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
889 struct extent_map *em = NULL;
890 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
891 u64 end;
892
893 read_lock(&em_tree->lock);
894 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
895 read_unlock(&em_tree->lock);
896
897 if (em) {
898 end = extent_map_end(em);
899 free_extent_map(em);
900 if (end - offset > thresh)
901 return 0;
902 }
903 /* if we already have a nice delalloc here, just stop */
904 thresh /= 2;
905 end = count_range_bits(io_tree, &offset, offset + thresh,
906 thresh, EXTENT_DELALLOC, 1);
907 if (end >= thresh)
908 return 0;
909 return 1;
910}
911
912/*
913 * helper function to walk through a file and find extents
914 * newer than a specific transid, and smaller than thresh.
915 *
916 * This is used by the defragging code to find new and small
917 * extents
918 */
919static int find_new_extents(struct btrfs_root *root,
920 struct inode *inode, u64 newer_than,
921 u64 *off, int thresh)
922{
923 struct btrfs_path *path;
924 struct btrfs_key min_key;
4cb5300b
CM		 925 struct extent_buffer *leaf;
926 struct btrfs_file_extent_item *extent;
927 int type;
928 int ret;
a4689d2b 929 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 930
931 path = btrfs_alloc_path();
932 if (!path)
933 return -ENOMEM;
934
a4689d2b 935 min_key.objectid = ino;
4cb5300b
CM		 936 min_key.type = BTRFS_EXTENT_DATA_KEY;
937 min_key.offset = *off;
938
67871254 939 while (1) {
f094c9bd 940 path->keep_locks = 1;
6174d3cb 941 ret = btrfs_search_forward(root, &min_key, path, newer_than);
4cb5300b
CM		 942 if (ret != 0)
943 goto none;
f094c9bd
FM		 944 path->keep_locks = 0;
945 btrfs_unlock_up_safe(path, 1);
946process_slot:
a4689d2b 947 if (min_key.objectid != ino)
4cb5300b
CM		 948 goto none;
949 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
950 goto none;
951
952 leaf = path->nodes[0];
953 extent = btrfs_item_ptr(leaf, path->slots[0],
954 struct btrfs_file_extent_item);
955
956 type = btrfs_file_extent_type(leaf, extent);
957 if (type == BTRFS_FILE_EXTENT_REG &&
958 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
959 check_defrag_in_cache(inode, min_key.offset, thresh)) {
960 *off = min_key.offset;
961 btrfs_free_path(path);
962 return 0;
963 }
964
f094c9bd
FM		 965 path->slots[0]++;
966 if (path->slots[0] < btrfs_header_nritems(leaf)) {
967 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
968 goto process_slot;
969 }
970
4cb5300b
CM		 971 if (min_key.offset == (u64)-1)
972 goto none;
973
974 min_key.offset++;
975 btrfs_release_path(path);
976 }
977none:
978 btrfs_free_path(path);
979 return -ENOENT;
980}
981
6c282eb4 982static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 983{
984 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 985 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
986 struct extent_map *em;
987 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 988
6c282eb4
LZ		 989 /*
990 * hopefully we have this extent in the tree already, try without
991 * the full extent lock
992 */
17ce6ef8 993 read_lock(&em_tree->lock);
6c282eb4 994 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 995 read_unlock(&em_tree->lock);
996
6c282eb4 997 if (!em) {
308d9800
FM		 998 struct extent_state *cached = NULL;
999 u64 end = start + len - 1;
1000
6c282eb4 1001 /* get the big lock and read metadata off disk */
308d9800 1002 lock_extent_bits(io_tree, start, end, 0, &cached);
6c282eb4 1003 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
308d9800 1004 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
6c282eb4
LZ		 1005
1006 if (IS_ERR(em))
1007 return NULL;
1008 }
1009
1010 return em;
1011}
17ce6ef8 1012
6c282eb4
LZ		 1013static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1014{
1015 struct extent_map *next;
1016 bool ret = true;
1017
1018 /* this is the last extent */
1019 if (em->start + em->len >= i_size_read(inode))
1020 return false;
1021
1022 next = defrag_lookup_extent(inode, em->start + em->len);
e2127cf0
FM		 1023 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE ||
1024 (em->block_start + em->block_len == next->block_start))
6c282eb4
LZ		 1025 ret = false;
1026
1027 free_extent_map(next);
17ce6ef8
LB		 1028 return ret;
1029}
1030
6c282eb4 1031static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 1032 u64 *last_len, u64 *skip, u64 *defrag_end,
1033 int compress)
940100a4 1034{
6c282eb4 1035 struct extent_map *em;
940100a4 1036 int ret = 1;
6c282eb4 1037 bool next_mergeable = true;
940100a4
CM		 1038
1039 /*
008873ea 1040 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 1041 * defragging it
1042 */
1043 if (start < *defrag_end)
1044 return 1;
1045
1046 *skip = 0;
1047
6c282eb4
LZ		 1048 em = defrag_lookup_extent(inode, start);
1049 if (!em)
1050 return 0;
940100a4
CM		 1051
1052 /* this will cover holes, and inline extents */
17ce6ef8 1053 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 1054 ret = 0;
17ce6ef8
LB		 1055 goto out;
1056 }
1057
6c282eb4 1058 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 1059
1060 /*
6c282eb4
LZ		 1061 * we hit a real extent, if it is big or the next extent is not a
1062 * real extent, don't bother defragging it
940100a4 1063 */
a43a2111 1064 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 1065 (em->len >= thresh || !next_mergeable))
940100a4 1066 ret = 0;
17ce6ef8 1067out:
940100a4
CM		 1068 /*
1069 * last_len ends up being a counter of how many bytes we've defragged.
1070 * every time we choose not to defrag an extent, we reset *last_len
1071 * so that the next tiny extent will force a defrag.
1072 *
1073 * The end result of this is that tiny extents before a single big
1074 * extent will force at least part of that big extent to be defragged.
1075 */
1076 if (ret) {
940100a4
CM		 1077 *defrag_end = extent_map_end(em);
1078 } else {
1079 *last_len = 0;
1080 *skip = extent_map_end(em);
1081 *defrag_end = 0;
1082 }
1083
1084 free_extent_map(em);
1085 return ret;
1086}
1087
4cb5300b
CM		 1088/*
1089 * it doesn't do much good to defrag one or two pages
1090 * at a time. This pulls in a nice chunk of pages
1091 * to COW and defrag.
1092 *
1093 * It also makes sure the delalloc code has enough
1094 * dirty data to avoid making new small extents as part
1095 * of the defrag
1096 *
1097 * It's a good idea to start RA on this range
1098 * before calling this.
1099 */
1100static int cluster_pages_for_defrag(struct inode *inode,
1101 struct page **pages,
1102 unsigned long start_index,
c41570c9 1103 unsigned long num_pages)
f46b5a66 1104{
4cb5300b
CM		 1105 unsigned long file_end;
1106 u64 isize = i_size_read(inode);
1107 u64 page_start;
1108 u64 page_end;
1f12bd06 1109 u64 page_cnt;
4cb5300b
CM		 1110 int ret;
1111 int i;
1112 int i_done;
3eaa2885 1113 struct btrfs_ordered_extent *ordered;
4cb5300b 1114 struct extent_state *cached_state = NULL;
600a45e1 1115 struct extent_io_tree *tree;
3b16a4e3 1116 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1117
4cb5300b 1118 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 1119 if (!isize || start_index > file_end)
1120 return 0;
1121
1122 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 1123
1124 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 1125 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1126 if (ret)
1127 return ret;
4cb5300b 1128 i_done = 0;
600a45e1 1129 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1130
1131 /* step one, lock all the pages */
1f12bd06 1132 for (i = 0; i < page_cnt; i++) {
4cb5300b 1133 struct page *page;
600a45e1 1134again:
a94733d0 1135 page = find_or_create_page(inode->i_mapping,
600a45e1 1136 start_index + i, mask);
4cb5300b
CM		 1137 if (!page)
1138 break;
1139
600a45e1
MX		 1140 page_start = page_offset(page);
1141 page_end = page_start + PAGE_CACHE_SIZE - 1;
1142 while (1) {
308d9800
FM		 1143 lock_extent_bits(tree, page_start, page_end,
1144 0, &cached_state);
600a45e1
MX		 1145 ordered = btrfs_lookup_ordered_extent(inode,
1146 page_start);
308d9800
FM		 1147 unlock_extent_cached(tree, page_start, page_end,
1148 &cached_state, GFP_NOFS);
600a45e1
MX		 1149 if (!ordered)
1150 break;
1151
1152 unlock_page(page);
1153 btrfs_start_ordered_extent(inode, ordered, 1);
1154 btrfs_put_ordered_extent(ordered);
1155 lock_page(page);
1f12bd06
LB		 1156 /*
1157 * we unlocked the page above, so we need check if
1158 * it was released or not.
1159 */
1160 if (page->mapping != inode->i_mapping) {
1161 unlock_page(page);
1162 page_cache_release(page);
1163 goto again;
1164 }
600a45e1
MX		 1165 }
1166
4cb5300b
CM		 1167 if (!PageUptodate(page)) {
1168 btrfs_readpage(NULL, page);
1169 lock_page(page);
1170 if (!PageUptodate(page)) {
1171 unlock_page(page);
1172 page_cache_release(page);
1173 ret = -EIO;
1174 break;
1175 }
1176 }
600a45e1 1177
600a45e1
MX		 1178 if (page->mapping != inode->i_mapping) {
1179 unlock_page(page);
1180 page_cache_release(page);
1181 goto again;
1182 }
1183
4cb5300b
CM		 1184 pages[i] = page;
1185 i_done++;
1186 }
1187 if (!i_done || ret)
1188 goto out;
1189
1190 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1191 goto out;
1192
1193 /*
1194 * so now we have a nice long stream of locked
1195 * and up to date pages, lets wait on them
1196 */
1197 for (i = 0; i < i_done; i++)
1198 wait_on_page_writeback(pages[i]);
1199
1200 page_start = page_offset(pages[0]);
1201 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1202
1203 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1204 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1205 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1206 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1207 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1208 &cached_state, GFP_NOFS);
4cb5300b 1209
1f12bd06 1210 if (i_done != page_cnt) {
9e0baf60
JB		 1211 spin_lock(&BTRFS_I(inode)->lock);
1212 BTRFS_I(inode)->outstanding_extents++;
1213 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1214 btrfs_delalloc_release_space(inode,
1f12bd06 1215 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1216 }
1217
1218
9e8a4a8b
LB		 1219 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1220 &cached_state, GFP_NOFS);
4cb5300b
CM		 1221
1222 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1223 page_start, page_end - 1, &cached_state,
1224 GFP_NOFS);
1225
1226 for (i = 0; i < i_done; i++) {
1227 clear_page_dirty_for_io(pages[i]);
1228 ClearPageChecked(pages[i]);
1229 set_page_extent_mapped(pages[i]);
1230 set_page_dirty(pages[i]);
1231 unlock_page(pages[i]);
1232 page_cache_release(pages[i]);
1233 }
1234 return i_done;
1235out:
1236 for (i = 0; i < i_done; i++) {
1237 unlock_page(pages[i]);
1238 page_cache_release(pages[i]);
1239 }
1f12bd06 1240 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1241 return ret;
1242
1243}
1244
1245int btrfs_defrag_file(struct inode *inode, struct file *file,
1246 struct btrfs_ioctl_defrag_range_args *range,
1247 u64 newer_than, unsigned long max_to_defrag)
1248{
1249 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1250 struct file_ra_state *ra = NULL;
f46b5a66 1251 unsigned long last_index;
151a31b2 1252 u64 isize = i_size_read(inode);
940100a4
CM		 1253 u64 last_len = 0;
1254 u64 skip = 0;
1255 u64 defrag_end = 0;
4cb5300b 1256 u64 newer_off = range->start;
f46b5a66 1257 unsigned long i;
008873ea 1258 unsigned long ra_index = 0;
f46b5a66 1259 int ret;
4cb5300b 1260 int defrag_count = 0;
1a419d85 1261 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1262 int extent_thresh = range->extent_thresh;
c41570c9
JM		 1263 unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1264 unsigned long cluster = max_cluster;
4cb5300b
CM		 1265 u64 new_align = ~((u64)128 * 1024 - 1);
1266 struct page **pages = NULL;
1267
0abd5b17
LB		 1268 if (isize == 0)
1269 return 0;
1270
1271 if (range->start >= isize)
1272 return -EINVAL;
1a419d85
LZ		 1273
1274 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1275 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1276 return -EINVAL;
1277 if (range->compress_type)
1278 compress_type = range->compress_type;
1279 }
f46b5a66 1280
0abd5b17
LB		 1281 if (extent_thresh == 0)
1282 extent_thresh = 256 * 1024;
940100a4 1283
4cb5300b
CM		 1284 /*
1285 * if we were not given a file, allocate a readahead
1286 * context
1287 */
1288 if (!file) {
1289 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1290 if (!ra)
1291 return -ENOMEM;
1292 file_ra_state_init(ra, inode->i_mapping);
1293 } else {
1294 ra = &file->f_ra;
1295 }
1296
d9b0d9ba 1297 pages = kmalloc_array(max_cluster, sizeof(struct page *),
4cb5300b
CM		 1298 GFP_NOFS);
1299 if (!pages) {
1300 ret = -ENOMEM;
1301 goto out_ra;
1302 }
1303
1304 /* find the last page to defrag */
1e701a32 1305 if (range->start + range->len > range->start) {
151a31b2 1306 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1307 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1308 } else {
151a31b2 1309 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1310 }
1311
4cb5300b
CM		 1312 if (newer_than) {
1313 ret = find_new_extents(root, inode, newer_than,
1314 &newer_off, 64 * 1024);
1315 if (!ret) {
1316 range->start = newer_off;
1317 /*
1318 * we always align our defrag to help keep
1319 * the extents in the file evenly spaced
1320 */
1321 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1322 } else
1323 goto out_ra;
1324 } else {
1325 i = range->start >> PAGE_CACHE_SHIFT;
1326 }
1327 if (!max_to_defrag)
7ec31b54 1328 max_to_defrag = last_index + 1;
4cb5300b 1329
2a0f7f57
LZ		 1330 /*
1331 * make writeback starts from i, so the defrag range can be
1332 * written sequentially.
1333 */
1334 if (i < inode->i_mapping->writeback_index)
1335 inode->i_mapping->writeback_index = i;
1336
f7f43cc8
CM		 1337 while (i <= last_index && defrag_count < max_to_defrag &&
1338 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1339 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1340 /*
1341 * make sure we stop running if someone unmounts
1342 * the FS
1343 */
1344 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1345 break;
1346
210549eb 1347 if (btrfs_defrag_cancelled(root->fs_info)) {
efe120a0 1348 printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
210549eb
DS		 1349 ret = -EAGAIN;
1350 break;
1351 }
1352
66c26892 1353 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1354 extent_thresh, &last_len, &skip,
a43a2111
AM		 1355 &defrag_end, range->flags &
1356 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1357 unsigned long next;
1358 /*
1359 * the should_defrag function tells us how much to skip
1360 * bump our counter by the suggested amount
1361 */
1362 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1363 i = max(i + 1, next);
1364 continue;
1365 }
008873ea
LZ		 1366
1367 if (!newer_than) {
1368 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1369 PAGE_CACHE_SHIFT) - i;
1370 cluster = min(cluster, max_cluster);
1371 } else {
1372 cluster = max_cluster;
1373 }
1374
008873ea
LZ		 1375 if (i + cluster > ra_index) {
1376 ra_index = max(i, ra_index);
1377 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1378 cluster);
1379 ra_index += max_cluster;
1380 }
940100a4 1381
ecb8bea8 1382 mutex_lock(&inode->i_mutex);
633085c7
FDBM		 1383 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1384 BTRFS_I(inode)->force_compress = compress_type;
008873ea 1385 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1386 if (ret < 0) {
1387 mutex_unlock(&inode->i_mutex);
4cb5300b 1388 goto out_ra;
ecb8bea8 1389 }
4cb5300b
CM		 1390
1391 defrag_count += ret;
d0e1d66b 1392 balance_dirty_pages_ratelimited(inode->i_mapping);
ecb8bea8 1393 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1394
1395 if (newer_than) {
1396 if (newer_off == (u64)-1)
1397 break;
1398
e1f041e1
LB		 1399 if (ret > 0)
1400 i += ret;
1401
4cb5300b
CM		 1402 newer_off = max(newer_off + 1,
1403 (u64)i << PAGE_CACHE_SHIFT);
1404
1405 ret = find_new_extents(root, inode,
1406 newer_than, &newer_off,
1407 64 * 1024);
1408 if (!ret) {
1409 range->start = newer_off;
1410 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1411 } else {
1412 break;
f46b5a66 1413 }
4cb5300b 1414 } else {
008873ea 1415 if (ret > 0) {
cbcc8326 1416 i += ret;
008873ea
LZ		 1417 last_len += ret << PAGE_CACHE_SHIFT;
1418 } else {
cbcc8326 1419 i++;
008873ea
LZ		 1420 last_len = 0;
1421 }
f46b5a66 1422 }
f46b5a66
CH		 1423 }
1424
dec8ef90 1425 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1e701a32 1426 filemap_flush(inode->i_mapping);
dec8ef90
FM		 1427 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1428 &BTRFS_I(inode)->runtime_flags))
1429 filemap_flush(inode->i_mapping);
1430 }
1e701a32
CM		 1431
1432 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1433 /* the filemap_flush will queue IO into the worker threads, but
1434 * we have to make sure the IO is actually started and that
1435 * ordered extents get created before we return
1436 */
1437 atomic_inc(&root->fs_info->async_submit_draining);
1438 while (atomic_read(&root->fs_info->nr_async_submits) ||
1439 atomic_read(&root->fs_info->async_delalloc_pages)) {
1440 wait_event(root->fs_info->async_submit_wait,
1441 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1442 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1443 }
1444 atomic_dec(&root->fs_info->async_submit_draining);
1e701a32
CM		 1445 }
1446
1a419d85 1447 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1448 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1449 }
1450
60ccf82f 1451 ret = defrag_count;
940100a4 1452
4cb5300b 1453out_ra:
633085c7
FDBM		 1454 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1455 mutex_lock(&inode->i_mutex);
1456 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1457 mutex_unlock(&inode->i_mutex);
1458 }
4cb5300b
CM		 1459 if (!file)
1460 kfree(ra);
1461 kfree(pages);
940100a4 1462 return ret;
f46b5a66
CH		 1463}
1464
198605a8 1465static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1466 void __user *arg)
f46b5a66
CH		 1467{
1468 u64 new_size;
1469 u64 old_size;
1470 u64 devid = 1;
496ad9aa 1471 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 1472 struct btrfs_ioctl_vol_args *vol_args;
1473 struct btrfs_trans_handle *trans;
1474 struct btrfs_device *device = NULL;
1475 char *sizestr;
9a40f122 1476 char *retptr;
f46b5a66
CH		 1477 char *devstr = NULL;
1478 int ret = 0;
f46b5a66
CH		 1479 int mod = 0;
1480
e441d54d
CM		 1481 if (!capable(CAP_SYS_ADMIN))
1482 return -EPERM;
1483
198605a8
MX		 1484 ret = mnt_want_write_file(file);
1485 if (ret)
1486 return ret;
1487
5ac00add
SB		 1488 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1489 1)) {
97547676 1490 mnt_drop_write_file(file);
e57138b3 1491 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1492 }
1493
5ac00add 1494 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 1495 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1496 if (IS_ERR(vol_args)) {
1497 ret = PTR_ERR(vol_args);
1498 goto out;
1499 }
5516e595
MF		 1500
1501 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1502
f46b5a66
CH		 1503 sizestr = vol_args->name;
1504 devstr = strchr(sizestr, ':');
1505 if (devstr) {
1506 char *end;
1507 sizestr = devstr + 1;
1508 *devstr = '\0';
1509 devstr = vol_args->name;
1510 devid = simple_strtoull(devstr, &end, 10);
dfd79829
MX		 1511 if (!devid) {
1512 ret = -EINVAL;
1513 goto out_free;
1514 }
efe120a0 1515 btrfs_info(root->fs_info, "resizing devid %llu", devid);
f46b5a66 1516 }
dba60f3f 1517
aa1b8cd4 1518 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1519 if (!device) {
efe120a0 1520 btrfs_info(root->fs_info, "resizer unable to find device %llu",
c1c9ff7c 1521 devid);
dfd79829 1522 ret = -ENODEV;
c9e9f97b 1523 goto out_free;
f46b5a66 1524 }
dba60f3f
MX		 1525
1526 if (!device->writeable) {
efe120a0
FH		 1527 btrfs_info(root->fs_info,
1528 "resizer unable to apply on readonly device %llu",
c1c9ff7c 1529 devid);
dfd79829 1530 ret = -EPERM;
4e42ae1b
LB		 1531 goto out_free;
1532 }
1533
f46b5a66
CH		 1534 if (!strcmp(sizestr, "max"))
1535 new_size = device->bdev->bd_inode->i_size;
1536 else {
1537 if (sizestr[0] == '-') {
1538 mod = -1;
1539 sizestr++;
1540 } else if (sizestr[0] == '+') {
1541 mod = 1;
1542 sizestr++;
1543 }
9a40f122
GH		 1544 new_size = memparse(sizestr, &retptr);
1545 if (*retptr != '\0' || new_size == 0) {
f46b5a66 1546 ret = -EINVAL;
c9e9f97b 1547 goto out_free;
f46b5a66
CH		 1548 }
1549 }
1550
63a212ab 1551 if (device->is_tgtdev_for_dev_replace) {
dfd79829 1552 ret = -EPERM;
63a212ab
SB		 1553 goto out_free;
1554 }
1555
f46b5a66
CH		 1556 old_size = device->total_bytes;
1557
1558 if (mod < 0) {
1559 if (new_size > old_size) {
1560 ret = -EINVAL;
c9e9f97b 1561 goto out_free;
f46b5a66
CH		 1562 }
1563 new_size = old_size - new_size;
1564 } else if (mod > 0) {
eb8052e0
WF		 1565 if (new_size > ULLONG_MAX - old_size) {
1566 ret = -EINVAL;
1567 goto out_free;
1568 }
f46b5a66
CH		 1569 new_size = old_size + new_size;
1570 }
1571
1572 if (new_size < 256 * 1024 * 1024) {
1573 ret = -EINVAL;
c9e9f97b 1574 goto out_free;
f46b5a66
CH		 1575 }
1576 if (new_size > device->bdev->bd_inode->i_size) {
1577 ret = -EFBIG;
c9e9f97b 1578 goto out_free;
f46b5a66
CH		 1579 }
1580
1581 do_div(new_size, root->sectorsize);
1582 new_size *= root->sectorsize;
1583
efe120a0 1584 printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
c1c9ff7c 1585 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1586
1587 if (new_size > old_size) {
a22285a6 1588 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1589 if (IS_ERR(trans)) {
1590 ret = PTR_ERR(trans);
c9e9f97b 1591 goto out_free;
98d5dc13 1592 }
f46b5a66
CH		 1593 ret = btrfs_grow_device(trans, device, new_size);
1594 btrfs_commit_transaction(trans, root);
ece7d20e 1595 } else if (new_size < old_size) {
f46b5a66 1596 ret = btrfs_shrink_device(device, new_size);
0253f40e 1597 } /* equal, nothing need to do */
f46b5a66 1598
c9e9f97b 1599out_free:
f46b5a66 1600 kfree(vol_args);
c9e9f97b
ID		 1601out:
1602 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 1603 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
18f39c41 1604 mnt_drop_write_file(file);
f46b5a66
CH		 1605 return ret;
1606}
1607
72fd032e 1608static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1609 char *name, unsigned long fd, int subvol,
1610 u64 *transid, bool readonly,
8696c533 1611 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1612{
f46b5a66 1613 int namelen;
3de4586c 1614 int ret = 0;
f46b5a66 1615
a874a63e
LB		 1616 ret = mnt_want_write_file(file);
1617 if (ret)
1618 goto out;
1619
72fd032e
SW		 1620 namelen = strlen(name);
1621 if (strchr(name, '/')) {
f46b5a66 1622 ret = -EINVAL;
a874a63e 1623 goto out_drop_write;
f46b5a66
CH		 1624 }
1625
16780cab
CM		 1626 if (name[0] == '.' &&
1627 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1628 ret = -EEXIST;
a874a63e 1629 goto out_drop_write;
16780cab
CM		 1630 }
1631
3de4586c 1632 if (subvol) {
72fd032e 1633 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1634 NULL, transid, readonly, inherit);
cb8e7090 1635 } else {
2903ff01 1636 struct fd src = fdget(fd);
3de4586c 1637 struct inode *src_inode;
2903ff01 1638 if (!src.file) {
3de4586c 1639 ret = -EINVAL;
a874a63e 1640 goto out_drop_write;
3de4586c
CM		 1641 }
1642
496ad9aa
AV		 1643 src_inode = file_inode(src.file);
1644 if (src_inode->i_sb != file_inode(file)->i_sb) {
efe120a0
FH		 1645 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1646 "Snapshot src from another FS");
23ad5b17 1647 ret = -EXDEV;
d0242061
DS		 1648 } else if (!inode_owner_or_capable(src_inode)) {
1649 /*
1650 * Subvolume creation is not restricted, but snapshots
1651 * are limited to own subvolumes only
1652 */
1653 ret = -EPERM;
ecd18815
AV		 1654 } else {
1655 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1656 BTRFS_I(src_inode)->root,
1657 transid, readonly, inherit);
3de4586c 1658 }
2903ff01 1659 fdput(src);
cb8e7090 1660 }
a874a63e
LB		 1661out_drop_write:
1662 mnt_drop_write_file(file);
f46b5a66 1663out:
72fd032e
SW		 1664 return ret;
1665}
1666
1667static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1668 void __user *arg, int subvol)
72fd032e 1669{
fa0d2b9b 1670 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1671 int ret;
1672
fa0d2b9b
LZ		 1673 vol_args = memdup_user(arg, sizeof(*vol_args));
1674 if (IS_ERR(vol_args))
1675 return PTR_ERR(vol_args);
1676 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1677
fa0d2b9b 1678 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1679 vol_args->fd, subvol,
6f72c7e2 1680 NULL, false, NULL);
fdfb1e4f 1681
fa0d2b9b
LZ		 1682 kfree(vol_args);
1683 return ret;
1684}
fdfb1e4f 1685
fa0d2b9b
LZ		 1686static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1687 void __user *arg, int subvol)
1688{
1689 struct btrfs_ioctl_vol_args_v2 *vol_args;
1690 int ret;
1691 u64 transid = 0;
1692 u64 *ptr = NULL;
b83cc969 1693 bool readonly = false;
6f72c7e2 1694 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1695
fa0d2b9b
LZ		 1696 vol_args = memdup_user(arg, sizeof(*vol_args));
1697 if (IS_ERR(vol_args))
1698 return PTR_ERR(vol_args);
1699 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1700
b83cc969 1701 if (vol_args->flags &
6f72c7e2
AJ		 1702 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1703 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1704 ret = -EOPNOTSUPP;
fa0d2b9b 1705 goto out;
72fd032e 1706 }
fa0d2b9b
LZ		 1707
1708 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1709 ptr = &transid;
b83cc969
LZ		 1710 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1711 readonly = true;
6f72c7e2
AJ		 1712 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1713 if (vol_args->size > PAGE_CACHE_SIZE) {
1714 ret = -EINVAL;
1715 goto out;
1716 }
1717 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1718 if (IS_ERR(inherit)) {
1719 ret = PTR_ERR(inherit);
1720 goto out;
1721 }
1722 }
fa0d2b9b
LZ		 1723
1724 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1725 vol_args->fd, subvol, ptr,
8696c533 1726 readonly, inherit);
fa0d2b9b
LZ		 1727
1728 if (ret == 0 && ptr &&
1729 copy_to_user(arg +
1730 offsetof(struct btrfs_ioctl_vol_args_v2,
1731 transid), ptr, sizeof(*ptr)))
1732 ret = -EFAULT;
fdfb1e4f 1733out:
f46b5a66 1734 kfree(vol_args);
6f72c7e2 1735 kfree(inherit);
f46b5a66
CH		 1736 return ret;
1737}
1738
0caa102d
LZ		 1739static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1740 void __user *arg)
1741{
496ad9aa 1742 struct inode *inode = file_inode(file);
0caa102d
LZ		 1743 struct btrfs_root *root = BTRFS_I(inode)->root;
1744 int ret = 0;
1745 u64 flags = 0;
1746
33345d01 1747 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1748 return -EINVAL;
1749
1750 down_read(&root->fs_info->subvol_sem);
1751 if (btrfs_root_readonly(root))
1752 flags |= BTRFS_SUBVOL_RDONLY;
1753 up_read(&root->fs_info->subvol_sem);
1754
1755 if (copy_to_user(arg, &flags, sizeof(flags)))
1756 ret = -EFAULT;
1757
1758 return ret;
1759}
1760
1761static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1762 void __user *arg)
1763{
496ad9aa 1764 struct inode *inode = file_inode(file);
0caa102d
LZ		 1765 struct btrfs_root *root = BTRFS_I(inode)->root;
1766 struct btrfs_trans_handle *trans;
1767 u64 root_flags;
1768 u64 flags;
1769 int ret = 0;
1770
bd60ea0f
DS		 1771 if (!inode_owner_or_capable(inode))
1772 return -EPERM;
1773
b9ca0664
LB		 1774 ret = mnt_want_write_file(file);
1775 if (ret)
1776 goto out;
0caa102d 1777
b9ca0664
LB		 1778 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1779 ret = -EINVAL;
1780 goto out_drop_write;
1781 }
0caa102d 1782
b9ca0664
LB		 1783 if (copy_from_user(&flags, arg, sizeof(flags))) {
1784 ret = -EFAULT;
1785 goto out_drop_write;
1786 }
0caa102d 1787
b9ca0664
LB		 1788 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1789 ret = -EINVAL;
1790 goto out_drop_write;
1791 }
0caa102d 1792
b9ca0664
LB		 1793 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1794 ret = -EOPNOTSUPP;
1795 goto out_drop_write;
1796 }
0caa102d
LZ		 1797
1798 down_write(&root->fs_info->subvol_sem);
1799
1800 /* nothing to do */
1801 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1802 goto out_drop_sem;
0caa102d
LZ		 1803
1804 root_flags = btrfs_root_flags(&root->root_item);
2c686537 1805 if (flags & BTRFS_SUBVOL_RDONLY) {
0caa102d
LZ		 1806 btrfs_set_root_flags(&root->root_item,
1807 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1808 } else {
1809 /*
1810 * Block RO -> RW transition if this subvolume is involved in
1811 * send
1812 */
1813 spin_lock(&root->root_item_lock);
1814 if (root->send_in_progress == 0) {
1815 btrfs_set_root_flags(&root->root_item,
0caa102d 1816 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1817 spin_unlock(&root->root_item_lock);
1818 } else {
1819 spin_unlock(&root->root_item_lock);
1820 btrfs_warn(root->fs_info,
1821 "Attempt to set subvolume %llu read-write during send",
1822 root->root_key.objectid);
1823 ret = -EPERM;
1824 goto out_drop_sem;
1825 }
1826 }
0caa102d
LZ		 1827
1828 trans = btrfs_start_transaction(root, 1);
1829 if (IS_ERR(trans)) {
1830 ret = PTR_ERR(trans);
1831 goto out_reset;
1832 }
1833
b4dc2b8c 1834 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1835 &root->root_key, &root->root_item);
1836
1837 btrfs_commit_transaction(trans, root);
1838out_reset:
1839 if (ret)
1840 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1841out_drop_sem:
0caa102d 1842 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1843out_drop_write:
1844 mnt_drop_write_file(file);
1845out:
0caa102d
LZ		 1846 return ret;
1847}
1848
76dda93c
YZ		 1849/*
1850 * helper to check if the subvolume references other subvolumes
1851 */
1852static noinline int may_destroy_subvol(struct btrfs_root *root)
1853{
1854 struct btrfs_path *path;
175a2b87 1855 struct btrfs_dir_item *di;
76dda93c 1856 struct btrfs_key key;
175a2b87 1857 u64 dir_id;
76dda93c
YZ		 1858 int ret;
1859
1860 path = btrfs_alloc_path();
1861 if (!path)
1862 return -ENOMEM;
1863
175a2b87
JB		 1864 /* Make sure this root isn't set as the default subvol */
1865 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1866 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1867 dir_id, "default", 7, 0);
1868 if (di && !IS_ERR(di)) {
1869 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1870 if (key.objectid == root->root_key.objectid) {
72de6b53
GS		 1871 ret = -EPERM;
1872 btrfs_err(root->fs_info, "deleting default subvolume "
1873 "%llu is not allowed", key.objectid);
175a2b87
JB		 1874 goto out;
1875 }
1876 btrfs_release_path(path);
1877 }
1878
76dda93c
YZ		 1879 key.objectid = root->root_key.objectid;
1880 key.type = BTRFS_ROOT_REF_KEY;
1881 key.offset = (u64)-1;
1882
1883 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1884 &key, path, 0, 0);
1885 if (ret < 0)
1886 goto out;
1887 BUG_ON(ret == 0);
1888
1889 ret = 0;
1890 if (path->slots[0] > 0) {
1891 path->slots[0]--;
1892 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1893 if (key.objectid == root->root_key.objectid &&
1894 key.type == BTRFS_ROOT_REF_KEY)
1895 ret = -ENOTEMPTY;
1896 }
1897out:
1898 btrfs_free_path(path);
1899 return ret;
1900}
1901
ac8e9819
CM		 1902static noinline int key_in_sk(struct btrfs_key *key,
1903 struct btrfs_ioctl_search_key *sk)
1904{
abc6e134
CM		 1905 struct btrfs_key test;
1906 int ret;
1907
1908 test.objectid = sk->min_objectid;
1909 test.type = sk->min_type;
1910 test.offset = sk->min_offset;
1911
1912 ret = btrfs_comp_cpu_keys(key, &test);
1913 if (ret < 0)
ac8e9819 1914 return 0;
abc6e134
CM		 1915
1916 test.objectid = sk->max_objectid;
1917 test.type = sk->max_type;
1918 test.offset = sk->max_offset;
1919
1920 ret = btrfs_comp_cpu_keys(key, &test);
1921 if (ret > 0)
ac8e9819
CM		 1922 return 0;
1923 return 1;
1924}
1925
1926static noinline int copy_to_sk(struct btrfs_root *root,
1927 struct btrfs_path *path,
1928 struct btrfs_key *key,
1929 struct btrfs_ioctl_search_key *sk,
1930 char *buf,
1931 unsigned long *sk_offset,
1932 int *num_found)
1933{
1934 u64 found_transid;
1935 struct extent_buffer *leaf;
1936 struct btrfs_ioctl_search_header sh;
1937 unsigned long item_off;
1938 unsigned long item_len;
1939 int nritems;
1940 int i;
1941 int slot;
ac8e9819
CM		 1942 int ret = 0;
1943
1944 leaf = path->nodes[0];
1945 slot = path->slots[0];
1946 nritems = btrfs_header_nritems(leaf);
1947
1948 if (btrfs_header_generation(leaf) > sk->max_transid) {
1949 i = nritems;
1950 goto advance_key;
1951 }
1952 found_transid = btrfs_header_generation(leaf);
1953
1954 for (i = slot; i < nritems; i++) {
1955 item_off = btrfs_item_ptr_offset(leaf, i);
1956 item_len = btrfs_item_size_nr(leaf, i);
1957
03b71c6c
GP		 1958 btrfs_item_key_to_cpu(leaf, key, i);
1959 if (!key_in_sk(key, sk))
1960 continue;
1961
1962 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
ac8e9819
CM		 1963 item_len = 0;
1964
1965 if (sizeof(sh) + item_len + *sk_offset >
1966 BTRFS_SEARCH_ARGS_BUFSIZE) {
1967 ret = 1;
1968 goto overflow;
1969 }
1970
ac8e9819
CM		 1971 sh.objectid = key->objectid;
1972 sh.offset = key->offset;
1973 sh.type = key->type;
1974 sh.len = item_len;
1975 sh.transid = found_transid;
1976
1977 /* copy search result header */
1978 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1979 *sk_offset += sizeof(sh);
1980
1981 if (item_len) {
1982 char *p = buf + *sk_offset;
1983 /* copy the item */
1984 read_extent_buffer(leaf, p,
1985 item_off, item_len);
1986 *sk_offset += item_len;
ac8e9819 1987 }
e2156867 1988 (*num_found)++;
ac8e9819
CM		 1989
1990 if (*num_found >= sk->nr_items)
1991 break;
1992 }
1993advance_key:
abc6e134
CM		 1994 ret = 0;
1995 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1996 key->offset++;
abc6e134
CM		 1997 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1998 key->offset = 0;
ac8e9819 1999 key->type++;
abc6e134
CM		 2000 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
2001 key->offset = 0;
2002 key->type = 0;
ac8e9819 2003 key->objectid++;
abc6e134
CM		 2004 } else
2005 ret = 1;
ac8e9819 2006overflow:
ac8e9819
CM		 2007 return ret;
2008}
2009
2010static noinline int search_ioctl(struct inode *inode,
2011 struct btrfs_ioctl_search_args *args)
2012{
2013 struct btrfs_root *root;
2014 struct btrfs_key key;
ac8e9819
CM		 2015 struct btrfs_path *path;
2016 struct btrfs_ioctl_search_key *sk = &args->key;
2017 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2018 int ret;
2019 int num_found = 0;
2020 unsigned long sk_offset = 0;
2021
2022 path = btrfs_alloc_path();
2023 if (!path)
2024 return -ENOMEM;
2025
2026 if (sk->tree_id == 0) {
2027 /* search the root of the inode that was passed */
2028 root = BTRFS_I(inode)->root;
2029 } else {
2030 key.objectid = sk->tree_id;
2031 key.type = BTRFS_ROOT_ITEM_KEY;
2032 key.offset = (u64)-1;
2033 root = btrfs_read_fs_root_no_name(info, &key);
2034 if (IS_ERR(root)) {
efe120a0 2035 printk(KERN_ERR "BTRFS: could not find root %llu\n",
ac8e9819
CM		 2036 sk->tree_id);
2037 btrfs_free_path(path);
2038 return -ENOENT;
2039 }
2040 }
2041
2042 key.objectid = sk->min_objectid;
2043 key.type = sk->min_type;
2044 key.offset = sk->min_offset;
2045
ac8e9819
CM		 2046 path->keep_locks = 1;
2047
67871254 2048 while (1) {
6174d3cb 2049 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
ac8e9819
CM		 2050 if (ret != 0) {
2051 if (ret > 0)
2052 ret = 0;
2053 goto err;
2054 }
2055 ret = copy_to_sk(root, path, &key, sk, args->buf,
2056 &sk_offset, &num_found);
b3b4aa74 2057 btrfs_release_path(path);
ac8e9819
CM		 2058 if (ret || num_found >= sk->nr_items)
2059 break;
2060
2061 }
2062 ret = 0;
2063err:
2064 sk->nr_items = num_found;
2065 btrfs_free_path(path);
2066 return ret;
2067}
2068
2069static noinline int btrfs_ioctl_tree_search(struct file *file,
2070 void __user *argp)
2071{
2072 struct btrfs_ioctl_search_args *args;
2073 struct inode *inode;
2074 int ret;
2075
2076 if (!capable(CAP_SYS_ADMIN))
2077 return -EPERM;
2078
2354d08f
JL		 2079 args = memdup_user(argp, sizeof(*args));
2080 if (IS_ERR(args))
2081 return PTR_ERR(args);
ac8e9819 2082
496ad9aa 2083 inode = file_inode(file);
ac8e9819
CM		 2084 ret = search_ioctl(inode, args);
2085 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2086 ret = -EFAULT;
2087 kfree(args);
2088 return ret;
2089}
2090
98d377a0 2091/*
ac8e9819
CM		 2092 * Search INODE_REFs to identify path name of 'dirid' directory
2093 * in a 'tree_id' tree. and sets path name to 'name'.
2094 */
98d377a0
TH		 2095static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2096 u64 tree_id, u64 dirid, char *name)
2097{
2098 struct btrfs_root *root;
2099 struct btrfs_key key;
ac8e9819 2100 char *ptr;
98d377a0
TH		 2101 int ret = -1;
2102 int slot;
2103 int len;
2104 int total_len = 0;
2105 struct btrfs_inode_ref *iref;
2106 struct extent_buffer *l;
2107 struct btrfs_path *path;
2108
2109 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2110 name[0]='\0';
2111 return 0;
2112 }
2113
2114 path = btrfs_alloc_path();
2115 if (!path)
2116 return -ENOMEM;
2117
ac8e9819 2118 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 2119
2120 key.objectid = tree_id;
2121 key.type = BTRFS_ROOT_ITEM_KEY;
2122 key.offset = (u64)-1;
2123 root = btrfs_read_fs_root_no_name(info, &key);
2124 if (IS_ERR(root)) {
efe120a0 2125 printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
8ad6fcab
CM		 2126 ret = -ENOENT;
2127 goto out;
98d377a0
TH		 2128 }
2129
2130 key.objectid = dirid;
2131 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2132 key.offset = (u64)-1;
98d377a0 2133
67871254 2134 while (1) {
98d377a0
TH		 2135 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2136 if (ret < 0)
2137 goto out;
18674c6c
FDBM		 2138 else if (ret > 0) {
2139 ret = btrfs_previous_item(root, path, dirid,
2140 BTRFS_INODE_REF_KEY);
2141 if (ret < 0)
2142 goto out;
2143 else if (ret > 0) {
2144 ret = -ENOENT;
2145 goto out;
2146 }
2147 }
98d377a0
TH		 2148
2149 l = path->nodes[0];
2150 slot = path->slots[0];
2151 btrfs_item_key_to_cpu(l, &key, slot);
2152
98d377a0
TH		 2153 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2154 len = btrfs_inode_ref_name_len(l, iref);
2155 ptr -= len + 1;
2156 total_len += len + 1;
a696cf35
FDBM		 2157 if (ptr < name) {
2158 ret = -ENAMETOOLONG;
98d377a0 2159 goto out;
a696cf35 2160 }
98d377a0
TH		 2161
2162 *(ptr + len) = '/';
67871254 2163 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
98d377a0
TH		 2164
2165 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2166 break;
2167
b3b4aa74 2168 btrfs_release_path(path);
98d377a0 2169 key.objectid = key.offset;
8ad6fcab 2170 key.offset = (u64)-1;
98d377a0 2171 dirid = key.objectid;
98d377a0 2172 }
77906a50 2173 memmove(name, ptr, total_len);
67871254 2174 name[total_len] = '\0';
98d377a0
TH		 2175 ret = 0;
2176out:
2177 btrfs_free_path(path);
ac8e9819
CM		 2178 return ret;
2179}
2180
2181static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2182 void __user *argp)
2183{
2184 struct btrfs_ioctl_ino_lookup_args *args;
2185 struct inode *inode;
2186 int ret;
2187
2188 if (!capable(CAP_SYS_ADMIN))
2189 return -EPERM;
2190
2354d08f
JL		 2191 args = memdup_user(argp, sizeof(*args));
2192 if (IS_ERR(args))
2193 return PTR_ERR(args);
c2b96929 2194
496ad9aa 2195 inode = file_inode(file);
ac8e9819 2196
1b53ac4d
CM		 2197 if (args->treeid == 0)
2198 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2199
ac8e9819
CM		 2200 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2201 args->treeid, args->objectid,
2202 args->name);
2203
2204 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2205 ret = -EFAULT;
2206
2207 kfree(args);
98d377a0
TH		 2208 return ret;
2209}
2210
76dda93c
YZ		 2211static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2212 void __user *arg)
2213{
54563d41 2214 struct dentry *parent = file->f_path.dentry;
76dda93c
YZ		 2215 struct dentry *dentry;
2216 struct inode *dir = parent->d_inode;
2217 struct inode *inode;
2218 struct btrfs_root *root = BTRFS_I(dir)->root;
2219 struct btrfs_root *dest = NULL;
2220 struct btrfs_ioctl_vol_args *vol_args;
2221 struct btrfs_trans_handle *trans;
c58aaad2 2222 struct btrfs_block_rsv block_rsv;
521e0546 2223 u64 root_flags;
c58aaad2 2224 u64 qgroup_reserved;
76dda93c
YZ		 2225 int namelen;
2226 int ret;
2227 int err = 0;
2228
76dda93c
YZ		 2229 vol_args = memdup_user(arg, sizeof(*vol_args));
2230 if (IS_ERR(vol_args))
2231 return PTR_ERR(vol_args);
2232
2233 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2234 namelen = strlen(vol_args->name);
2235 if (strchr(vol_args->name, '/') ||
2236 strncmp(vol_args->name, "..", namelen) == 0) {
2237 err = -EINVAL;
2238 goto out;
2239 }
2240
a561be71 2241 err = mnt_want_write_file(file);
76dda93c
YZ		 2242 if (err)
2243 goto out;
2244
521e0546 2245
5c50c9b8
DS		 2246 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2247 if (err == -EINTR)
e43f998e 2248 goto out_drop_write;
76dda93c
YZ		 2249 dentry = lookup_one_len(vol_args->name, parent, namelen);
2250 if (IS_ERR(dentry)) {
2251 err = PTR_ERR(dentry);
2252 goto out_unlock_dir;
2253 }
2254
2255 if (!dentry->d_inode) {
2256 err = -ENOENT;
2257 goto out_dput;
2258 }
2259
2260 inode = dentry->d_inode;
4260f7c7 2261 dest = BTRFS_I(inode)->root;
67871254 2262 if (!capable(CAP_SYS_ADMIN)) {
4260f7c7
SW		 2263 /*
2264 * Regular user. Only allow this with a special mount
2265 * option, when the user has write+exec access to the
2266 * subvol root, and when rmdir(2) would have been
2267 * allowed.
2268 *
2269 * Note that this is _not_ check that the subvol is
2270 * empty or doesn't contain data that we wouldn't
2271 * otherwise be able to delete.
2272 *
2273 * Users who want to delete empty subvols should try
2274 * rmdir(2).
2275 */
2276 err = -EPERM;
2277 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2278 goto out_dput;
2279
2280 /*
2281 * Do not allow deletion if the parent dir is the same
2282 * as the dir to be deleted. That means the ioctl
2283 * must be called on the dentry referencing the root
2284 * of the subvol, not a random directory contained
2285 * within it.
2286 */
2287 err = -EINVAL;
2288 if (root == dest)
2289 goto out_dput;
2290
2291 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2292 if (err)
2293 goto out_dput;
4260f7c7
SW		 2294 }
2295
5c39da5b
MX		 2296 /* check if subvolume may be deleted by a user */
2297 err = btrfs_may_delete(dir, dentry, 1);
2298 if (err)
2299 goto out_dput;
2300
33345d01 2301 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2302 err = -EINVAL;
2303 goto out_dput;
2304 }
2305
76dda93c 2306 mutex_lock(&inode->i_mutex);
521e0546
DS		 2307
2308 /*
2309 * Don't allow to delete a subvolume with send in progress. This is
2310 * inside the i_mutex so the error handling that has to drop the bit
2311 * again is not run concurrently.
2312 */
2313 spin_lock(&dest->root_item_lock);
2314 root_flags = btrfs_root_flags(&root->root_item);
2315 if (root->send_in_progress == 0) {
2316 btrfs_set_root_flags(&root->root_item,
2317 root_flags | BTRFS_ROOT_SUBVOL_DEAD);
2318 spin_unlock(&dest->root_item_lock);
2319 } else {
2320 spin_unlock(&dest->root_item_lock);
2321 btrfs_warn(root->fs_info,
2322 "Attempt to delete subvolume %llu during send",
2323 root->root_key.objectid);
2324 err = -EPERM;
2325 goto out_dput;
2326 }
2327
76dda93c
YZ		 2328 err = d_invalidate(dentry);
2329 if (err)
2330 goto out_unlock;
2331
2332 down_write(&root->fs_info->subvol_sem);
2333
2334 err = may_destroy_subvol(dest);
2335 if (err)
2336 goto out_up_write;
2337
c58aaad2
MX		 2338 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2339 /*
2340 * One for dir inode, two for dir entries, two for root
2341 * ref/backref.
2342 */
2343 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
ee3441b4 2344 5, &qgroup_reserved, true);
c58aaad2
MX		 2345 if (err)
2346 goto out_up_write;
2347
a22285a6
YZ		 2348 trans = btrfs_start_transaction(root, 0);
2349 if (IS_ERR(trans)) {
2350 err = PTR_ERR(trans);
c58aaad2 2351 goto out_release;
a22285a6 2352 }
c58aaad2
MX		 2353 trans->block_rsv = &block_rsv;
2354 trans->bytes_reserved = block_rsv.size;
a22285a6 2355
76dda93c
YZ		 2356 ret = btrfs_unlink_subvol(trans, root, dir,
2357 dest->root_key.objectid,
2358 dentry->d_name.name,
2359 dentry->d_name.len);
79787eaa
JM		 2360 if (ret) {
2361 err = ret;
2362 btrfs_abort_transaction(trans, root, ret);
2363 goto out_end_trans;
2364 }
76dda93c
YZ		 2365
2366 btrfs_record_root_in_trans(trans, dest);
2367
2368 memset(&dest->root_item.drop_progress, 0,
2369 sizeof(dest->root_item.drop_progress));
2370 dest->root_item.drop_level = 0;
2371 btrfs_set_root_refs(&dest->root_item, 0);
2372
27cdeb70 2373 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
d68fc57b
YZ		 2374 ret = btrfs_insert_orphan_item(trans,
2375 root->fs_info->tree_root,
2376 dest->root_key.objectid);
79787eaa
JM		 2377 if (ret) {
2378 btrfs_abort_transaction(trans, root, ret);
2379 err = ret;
2380 goto out_end_trans;
2381 }
d68fc57b 2382 }
dd5f9615
SB		 2383
2384 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2385 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2386 dest->root_key.objectid);
2387 if (ret && ret != -ENOENT) {
2388 btrfs_abort_transaction(trans, root, ret);
2389 err = ret;
2390 goto out_end_trans;
2391 }
2392 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2393 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2394 dest->root_item.received_uuid,
2395 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2396 dest->root_key.objectid);
2397 if (ret && ret != -ENOENT) {
2398 btrfs_abort_transaction(trans, root, ret);
2399 err = ret;
2400 goto out_end_trans;
2401 }
2402 }
2403
79787eaa 2404out_end_trans:
c58aaad2
MX		 2405 trans->block_rsv = NULL;
2406 trans->bytes_reserved = 0;
531cb13f 2407 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2408 if (ret && !err)
2409 err = ret;
76dda93c 2410 inode->i_flags |= S_DEAD;
c58aaad2
MX		 2411out_release:
2412 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
76dda93c
YZ		 2413out_up_write:
2414 up_write(&root->fs_info->subvol_sem);
2415out_unlock:
521e0546
DS		 2416 if (err) {
2417 spin_lock(&dest->root_item_lock);
2418 root_flags = btrfs_root_flags(&root->root_item);
2419 btrfs_set_root_flags(&root->root_item,
2420 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
2421 spin_unlock(&dest->root_item_lock);
2422 }
76dda93c
YZ		 2423 mutex_unlock(&inode->i_mutex);
2424 if (!err) {
efefb143 2425 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2426 btrfs_invalidate_inodes(dest);
2427 d_delete(dentry);
61155aa0 2428 ASSERT(dest->send_in_progress == 0);
fa6ac876
LB		 2429
2430 /* the last ref */
2431 if (dest->cache_inode) {
2432 iput(dest->cache_inode);
2433 dest->cache_inode = NULL;
2434 }
76dda93c
YZ		 2435 }
2436out_dput:
2437 dput(dentry);
2438out_unlock_dir:
2439 mutex_unlock(&dir->i_mutex);
e43f998e 2440out_drop_write:
2a79f17e 2441 mnt_drop_write_file(file);
76dda93c
YZ		 2442out:
2443 kfree(vol_args);
2444 return err;
2445}
2446
1e701a32 2447static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2448{
496ad9aa 2449 struct inode *inode = file_inode(file);
f46b5a66 2450 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2451 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2452 int ret;
2453
25122d15
ID		 2454 ret = mnt_want_write_file(file);
2455 if (ret)
2456 return ret;
b83cc969 2457
25122d15
ID		 2458 if (btrfs_root_readonly(root)) {
2459 ret = -EROFS;
2460 goto out;
5ac00add 2461 }
f46b5a66
CH		 2462
2463 switch (inode->i_mode & S_IFMT) {
2464 case S_IFDIR:
e441d54d
CM		 2465 if (!capable(CAP_SYS_ADMIN)) {
2466 ret = -EPERM;
2467 goto out;
2468 }
de78b51a 2469 ret = btrfs_defrag_root(root);
8929ecfa
YZ		 2470 if (ret)
2471 goto out;
de78b51a 2472 ret = btrfs_defrag_root(root->fs_info->extent_root);
f46b5a66
CH		 2473 break;
2474 case S_IFREG:
e441d54d
CM		 2475 if (!(file->f_mode & FMODE_WRITE)) {
2476 ret = -EINVAL;
2477 goto out;
2478 }
1e701a32
CM		 2479
2480 range = kzalloc(sizeof(*range), GFP_KERNEL);
2481 if (!range) {
2482 ret = -ENOMEM;
2483 goto out;
2484 }
2485
2486 if (argp) {
2487 if (copy_from_user(range, argp,
2488 sizeof(*range))) {
2489 ret = -EFAULT;
2490 kfree(range);
683be16e 2491 goto out;
1e701a32
CM		 2492 }
2493 /* compression requires us to start the IO */
2494 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2495 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2496 range->extent_thresh = (u32)-1;
2497 }
2498 } else {
2499 /* the rest are all set to zero by kzalloc */
2500 range->len = (u64)-1;
2501 }
496ad9aa 2502 ret = btrfs_defrag_file(file_inode(file), file,
4cb5300b
CM		 2503 range, 0, 0);
2504 if (ret > 0)
2505 ret = 0;
1e701a32 2506 kfree(range);
f46b5a66 2507 break;
8929ecfa
YZ		 2508 default:
2509 ret = -EINVAL;
f46b5a66 2510 }
e441d54d 2511out:
25122d15 2512 mnt_drop_write_file(file);
e441d54d 2513 return ret;
f46b5a66
CH		 2514}
2515
b2950863 2516static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2517{
2518 struct btrfs_ioctl_vol_args *vol_args;
2519 int ret;
2520
e441d54d
CM		 2521 if (!capable(CAP_SYS_ADMIN))
2522 return -EPERM;
2523
5ac00add
SB		 2524 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2525 1)) {
e57138b3 2526 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 2527 }
2528
5ac00add 2529 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2530 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2531 if (IS_ERR(vol_args)) {
2532 ret = PTR_ERR(vol_args);
2533 goto out;
2534 }
f46b5a66 2535
5516e595 2536 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2537 ret = btrfs_init_new_device(root, vol_args->name);
2538
f46b5a66 2539 kfree(vol_args);
c9e9f97b
ID		 2540out:
2541 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2542 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
f46b5a66
CH		 2543 return ret;
2544}
2545
da24927b 2546static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 2547{
496ad9aa 2548 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 2549 struct btrfs_ioctl_vol_args *vol_args;
2550 int ret;
2551
e441d54d
CM		 2552 if (!capable(CAP_SYS_ADMIN))
2553 return -EPERM;
2554
da24927b
MX		 2555 ret = mnt_want_write_file(file);
2556 if (ret)
2557 return ret;
c146afad 2558
dae7b665 2559 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2560 if (IS_ERR(vol_args)) {
2561 ret = PTR_ERR(vol_args);
2562 goto out;
2563 }
f46b5a66 2564
5516e595 2565 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 2566
183860f6
AJ		 2567 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2568 1)) {
2569 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2570 goto out;
2571 }
2572
2573 mutex_lock(&root->fs_info->volume_mutex);
2574 ret = btrfs_rm_device(root, vol_args->name);
c9e9f97b 2575 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2576 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
183860f6
AJ		 2577
2578out:
2579 kfree(vol_args);
4ac20c70 2580 mnt_drop_write_file(file);
f46b5a66
CH		 2581 return ret;
2582}
2583
475f6387
JS		 2584static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2585{
027ed2f0 2586 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2587 struct btrfs_device *device;
2588 struct btrfs_device *next;
2589 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2590 int ret = 0;
475f6387 2591
027ed2f0
LZ		 2592 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2593 if (!fi_args)
2594 return -ENOMEM;
2595
f7171750 2596 mutex_lock(&fs_devices->device_list_mutex);
027ed2f0
LZ		 2597 fi_args->num_devices = fs_devices->num_devices;
2598 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387 2599
475f6387 2600 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2601 if (device->devid > fi_args->max_id)
2602 fi_args->max_id = device->devid;
475f6387
JS		 2603 }
2604 mutex_unlock(&fs_devices->device_list_mutex);
2605
80a773fb
DS		 2606 fi_args->nodesize = root->fs_info->super_copy->nodesize;
2607 fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
2608 fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;
2609
027ed2f0
LZ		 2610 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2611 ret = -EFAULT;
475f6387 2612
027ed2f0
LZ		 2613 kfree(fi_args);
2614 return ret;
475f6387
JS		 2615}
2616
2617static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2618{
2619 struct btrfs_ioctl_dev_info_args *di_args;
2620 struct btrfs_device *dev;
2621 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2622 int ret = 0;
2623 char *s_uuid = NULL;
475f6387 2624
475f6387
JS		 2625 di_args = memdup_user(arg, sizeof(*di_args));
2626 if (IS_ERR(di_args))
2627 return PTR_ERR(di_args);
2628
dd5f9615 2629 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 2630 s_uuid = di_args->uuid;
2631
2632 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2633 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2634
2635 if (!dev) {
2636 ret = -ENODEV;
2637 goto out;
2638 }
2639
2640 di_args->devid = dev->devid;
2641 di_args->bytes_used = dev->bytes_used;
2642 di_args->total_bytes = dev->total_bytes;
2643 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2644 if (dev->name) {
606686ee
JB		 2645 struct rcu_string *name;
2646
2647 rcu_read_lock();
2648 name = rcu_dereference(dev->name);
2649 strncpy(di_args->path, name->str, sizeof(di_args->path));
2650 rcu_read_unlock();
a27202fb
JM		 2651 di_args->path[sizeof(di_args->path) - 1] = 0;
2652 } else {
99ba55ad 2653 di_args->path[0] = '\0';
a27202fb 2654 }
475f6387
JS		 2655
2656out:
55793c0d 2657 mutex_unlock(&fs_devices->device_list_mutex);
475f6387
JS		 2658 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2659 ret = -EFAULT;
2660
2661 kfree(di_args);
2662 return ret;
2663}
2664
416161db
MF		 2665static struct page *extent_same_get_page(struct inode *inode, u64 off)
2666{
2667 struct page *page;
2668 pgoff_t index;
2669 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2670
2671 index = off >> PAGE_CACHE_SHIFT;
2672
2673 page = grab_cache_page(inode->i_mapping, index);
2674 if (!page)
2675 return NULL;
2676
2677 if (!PageUptodate(page)) {
2678 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2679 0))
2680 return NULL;
2681 lock_page(page);
2682 if (!PageUptodate(page)) {
2683 unlock_page(page);
2684 page_cache_release(page);
2685 return NULL;
2686 }
2687 }
2688 unlock_page(page);
2689
2690 return page;
2691}
2692
77fe20dc
MF		 2693static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2694{
2695 /* do any pending delalloc/csum calc on src, one way or
2696 another, and lock file content */
2697 while (1) {
2698 struct btrfs_ordered_extent *ordered;
2699 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2700 ordered = btrfs_lookup_first_ordered_extent(inode,
2701 off + len - 1);
2702 if (!ordered &&
2703 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2704 off + len - 1, EXTENT_DELALLOC, 0, NULL))
2705 break;
2706 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2707 if (ordered)
2708 btrfs_put_ordered_extent(ordered);
2709 btrfs_wait_ordered_range(inode, off, len);
2710 }
2711}
2712
416161db
MF		 2713static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2714 struct inode *inode2, u64 loff2, u64 len)
2715{
2716 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2717 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2718
2719 mutex_unlock(&inode1->i_mutex);
2720 mutex_unlock(&inode2->i_mutex);
2721}
2722
2723static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2724 struct inode *inode2, u64 loff2, u64 len)
2725{
2726 if (inode1 < inode2) {
2727 swap(inode1, inode2);
2728 swap(loff1, loff2);
2729 }
2730
2731 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2732 lock_extent_range(inode1, loff1, len);
2733 if (inode1 != inode2) {
2734 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2735 lock_extent_range(inode2, loff2, len);
2736 }
2737}
2738
2739static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2740 u64 dst_loff, u64 len)
2741{
2742 int ret = 0;
2743 struct page *src_page, *dst_page;
2744 unsigned int cmp_len = PAGE_CACHE_SIZE;
2745 void *addr, *dst_addr;
2746
2747 while (len) {
2748 if (len < PAGE_CACHE_SIZE)
2749 cmp_len = len;
2750
2751 src_page = extent_same_get_page(src, loff);
2752 if (!src_page)
2753 return -EINVAL;
2754 dst_page = extent_same_get_page(dst, dst_loff);
2755 if (!dst_page) {
2756 page_cache_release(src_page);
2757 return -EINVAL;
2758 }
2759 addr = kmap_atomic(src_page);
2760 dst_addr = kmap_atomic(dst_page);
2761
2762 flush_dcache_page(src_page);
2763 flush_dcache_page(dst_page);
2764
2765 if (memcmp(addr, dst_addr, cmp_len))
2766 ret = BTRFS_SAME_DATA_DIFFERS;
2767
2768 kunmap_atomic(addr);
2769 kunmap_atomic(dst_addr);
2770 page_cache_release(src_page);
2771 page_cache_release(dst_page);
2772
2773 if (ret)
2774 break;
2775
2776 loff += cmp_len;
2777 dst_loff += cmp_len;
2778 len -= cmp_len;
2779 }
2780
2781 return ret;
2782}
2783
2784static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2785{
2786 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2787
2788 if (off + len > inode->i_size || off + len < off)
2789 return -EINVAL;
2790 /* Check that we are block aligned - btrfs_clone() requires this */
2791 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2792 return -EINVAL;
2793
2794 return 0;
2795}
2796
2797static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2798 struct inode *dst, u64 dst_loff)
2799{
2800 int ret;
2801
2802 /*
2803 * btrfs_clone() can't handle extents in the same file
2804 * yet. Once that works, we can drop this check and replace it
2805 * with a check for the same inode, but overlapping extents.
2806 */
2807 if (src == dst)
2808 return -EINVAL;
2809
2810 btrfs_double_lock(src, loff, dst, dst_loff, len);
2811
2812 ret = extent_same_check_offsets(src, loff, len);
2813 if (ret)
2814 goto out_unlock;
2815
2816 ret = extent_same_check_offsets(dst, dst_loff, len);
2817 if (ret)
2818 goto out_unlock;
2819
2820 /* don't make the dst file partly checksummed */
2821 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2822 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2823 ret = -EINVAL;
2824 goto out_unlock;
2825 }
2826
2827 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2828 if (ret == 0)
2829 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2830
2831out_unlock:
2832 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2833
2834 return ret;
2835}
2836
2837#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2838
2839static long btrfs_ioctl_file_extent_same(struct file *file,
1c1c8747 2840 struct btrfs_ioctl_same_args __user *argp)
416161db 2841{
cbf8b8ca
MF		 2842 struct btrfs_ioctl_same_args *same;
2843 struct btrfs_ioctl_same_extent_info *info;
1c1c8747 2844 struct inode *src = file_inode(file);
416161db
MF		 2845 u64 off;
2846 u64 len;
2847 int i;
2848 int ret;
cbf8b8ca 2849 unsigned long size;
416161db
MF		 2850 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2851 bool is_admin = capable(CAP_SYS_ADMIN);
1c1c8747 2852 u16 count;
416161db
MF		 2853
2854 if (!(file->f_mode & FMODE_READ))
2855 return -EINVAL;
2856
2857 ret = mnt_want_write_file(file);
2858 if (ret)
2859 return ret;
2860
1c1c8747 2861 if (get_user(count, &argp->dest_count)) {
416161db
MF		 2862 ret = -EFAULT;
2863 goto out;
2864 }
2865
1c1c8747 2866 size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
cbf8b8ca 2867
1c1c8747 2868 same = memdup_user(argp, size);
cbf8b8ca 2869
229eed43
GB		 2870 if (IS_ERR(same)) {
2871 ret = PTR_ERR(same);
cbf8b8ca
MF		 2872 goto out;
2873 }
2874
2875 off = same->logical_offset;
2876 len = same->length;
416161db
MF		 2877
2878 /*
2879 * Limit the total length we will dedupe for each operation.
2880 * This is intended to bound the total time spent in this
2881 * ioctl to something sane.
2882 */
2883 if (len > BTRFS_MAX_DEDUPE_LEN)
2884 len = BTRFS_MAX_DEDUPE_LEN;
2885
2886 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2887 /*
2888 * Btrfs does not support blocksize < page_size. As a
2889 * result, btrfs_cmp_data() won't correctly handle
2890 * this situation without an update.
2891 */
2892 ret = -EINVAL;
2893 goto out;
2894 }
2895
2896 ret = -EISDIR;
2897 if (S_ISDIR(src->i_mode))
2898 goto out;
2899
2900 ret = -EACCES;
2901 if (!S_ISREG(src->i_mode))
2902 goto out;
2903
cbf8b8ca 2904 /* pre-format output fields to sane values */
1c1c8747 2905 for (i = 0; i < count; i++) {
cbf8b8ca
MF		 2906 same->info[i].bytes_deduped = 0ULL;
2907 same->info[i].status = 0;
2908 }
416161db 2909
1c1c8747
AV		 2910 for (i = 0, info = same->info; i < count; i++, info++) {
2911 struct inode *dst;
2912 struct fd dst_file = fdget(info->fd);
2913 if (!dst_file.file) {
cbf8b8ca 2914 info->status = -EBADF;
1c1c8747 2915 continue;
416161db 2916 }
1c1c8747 2917 dst = file_inode(dst_file.file);
416161db 2918
1c1c8747 2919 if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
cbf8b8ca 2920 info->status = -EINVAL;
1c1c8747
AV		 2921 } else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
2922 info->status = -EXDEV;
2923 } else if (S_ISDIR(dst->i_mode)) {
cbf8b8ca 2924 info->status = -EISDIR;
1c1c8747 2925 } else if (!S_ISREG(dst->i_mode)) {
cbf8b8ca 2926 info->status = -EACCES;
1c1c8747
AV		 2927 } else {
2928 info->status = btrfs_extent_same(src, off, len, dst,
2929 info->logical_offset);
2930 if (info->status == 0)
2931 info->bytes_deduped += len;
416161db 2932 }
1c1c8747 2933 fdput(dst_file);
416161db
MF		 2934 }
2935
cbf8b8ca
MF		 2936 ret = copy_to_user(argp, same, size);
2937 if (ret)
2938 ret = -EFAULT;
2939
416161db
MF		 2940out:
2941 mnt_drop_write_file(file);
2942 return ret;
2943}
2944
fcebe456
JB		 2945/* Helper to check and see if this root currently has a ref on the given disk
2946 * bytenr. If it does then we need to update the quota for this root. This
2947 * doesn't do anything if quotas aren't enabled.
2948 */
2949static int check_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2950 u64 disko)
2951{
2952 struct seq_list tree_mod_seq_elem = {};
2953 struct ulist *roots;
2954 struct ulist_iterator uiter;
2955 struct ulist_node *root_node = NULL;
2956 int ret;
2957
2958 if (!root->fs_info->quota_enabled)
2959 return 1;
2960
2961 btrfs_get_tree_mod_seq(root->fs_info, &tree_mod_seq_elem);
2962 ret = btrfs_find_all_roots(trans, root->fs_info, disko,
2963 tree_mod_seq_elem.seq, &roots);
2964 if (ret < 0)
2965 goto out;
2966 ret = 0;
2967 ULIST_ITER_INIT(&uiter);
2968 while ((root_node = ulist_next(roots, &uiter))) {
2969 if (root_node->val == root->objectid) {
2970 ret = 1;
2971 break;
2972 }
2973 }
2974 ulist_free(roots);
2975out:
2976 btrfs_put_tree_mod_seq(root->fs_info, &tree_mod_seq_elem);
2977 return ret;
2978}
2979
32b7c687
MF		 2980/**
2981 * btrfs_clone() - clone a range from inode file to another
2982 *
2983 * @src: Inode to clone from
2984 * @inode: Inode to clone to
2985 * @off: Offset within source to start clone from
2986 * @olen: Original length, passed by user, of range to clone
2987 * @olen_aligned: Block-aligned value of olen, extent_same uses
2988 * identical values here
2989 * @destoff: Offset within @inode to start clone
2990 */
2991static int btrfs_clone(struct inode *src, struct inode *inode,
2992 u64 off, u64 olen, u64 olen_aligned, u64 destoff)
f46b5a66 2993{
f46b5a66 2994 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 2995 struct btrfs_path *path = NULL;
f46b5a66 2996 struct extent_buffer *leaf;
32b7c687
MF		 2997 struct btrfs_trans_handle *trans;
2998 char *buf = NULL;
ae01a0ab 2999 struct btrfs_key key;
f46b5a66
CH		 3000 u32 nritems;
3001 int slot;
ae01a0ab 3002 int ret;
fcebe456 3003 int no_quota;
32b7c687 3004 u64 len = olen_aligned;
fcebe456 3005 u64 last_disko = 0;
ae01a0ab
YZ		 3006
3007 ret = -ENOMEM;
3008 buf = vmalloc(btrfs_level_size(root, 0));
3009 if (!buf)
32b7c687 3010 return ret;
ae01a0ab
YZ		 3011
3012 path = btrfs_alloc_path();
3013 if (!path) {
3014 vfree(buf);
32b7c687 3015 return ret;
d525e8ab
LZ		 3016 }
3017
32b7c687 3018 path->reada = 2;
c5c9cd4d 3019 /* clone data */
33345d01 3020 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 3021 key.type = BTRFS_EXTENT_DATA_KEY;
3022 key.offset = 0;
f46b5a66
CH		 3023
3024 while (1) {
3025 /*
3026 * note the key will change type as we walk through the
3027 * tree.
3028 */
e4355f34 3029 path->leave_spinning = 1;
362a20c5
DS		 3030 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3031 0, 0);
f46b5a66
CH		 3032 if (ret < 0)
3033 goto out;
3034
ae01a0ab 3035 nritems = btrfs_header_nritems(path->nodes[0]);
e4355f34 3036process_slot:
fcebe456 3037 no_quota = 1;
ae01a0ab 3038 if (path->slots[0] >= nritems) {
362a20c5 3039 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 3040 if (ret < 0)
3041 goto out;
3042 if (ret > 0)
3043 break;
ae01a0ab 3044 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 3045 }
3046 leaf = path->nodes[0];
3047 slot = path->slots[0];
f46b5a66 3048
ae01a0ab 3049 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 3050 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 3051 key.objectid != btrfs_ino(src))
f46b5a66
CH		 3052 break;
3053
c5c9cd4d
SW		 3054 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3055 struct btrfs_file_extent_item *extent;
3056 int type;
31840ae1
ZY		 3057 u32 size;
3058 struct btrfs_key new_key;
c5c9cd4d
SW		 3059 u64 disko = 0, diskl = 0;
3060 u64 datao = 0, datal = 0;
3061 u8 comp;
b5384d48 3062 u64 endoff;
31840ae1 3063
c5c9cd4d
SW		 3064 extent = btrfs_item_ptr(leaf, slot,
3065 struct btrfs_file_extent_item);
3066 comp = btrfs_file_extent_compression(leaf, extent);
3067 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 3068 if (type == BTRFS_FILE_EXTENT_REG ||
3069 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 3070 disko = btrfs_file_extent_disk_bytenr(leaf,
3071 extent);
3072 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3073 extent);
c5c9cd4d 3074 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 3075 datal = btrfs_file_extent_num_bytes(leaf,
3076 extent);
c5c9cd4d
SW		 3077 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3078 /* take upper bound, may be compressed */
3079 datal = btrfs_file_extent_ram_bytes(leaf,
3080 extent);
3081 }
31840ae1 3082
050006a7 3083 if (key.offset + datal <= off ||
e4355f34
FDBM		 3084 key.offset >= off + len - 1) {
3085 path->slots[0]++;
3086 goto process_slot;
3087 }
3088
3089 size = btrfs_item_size_nr(leaf, slot);
3090 read_extent_buffer(leaf, buf,
3091 btrfs_item_ptr_offset(leaf, slot),
3092 size);
3093
3094 btrfs_release_path(path);
3095 path->leave_spinning = 0;
c5c9cd4d 3096
31840ae1 3097 memcpy(&new_key, &key, sizeof(new_key));
33345d01 3098 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 3099 if (off <= key.offset)
3100 new_key.offset = key.offset + destoff - off;
3101 else
3102 new_key.offset = destoff;
31840ae1 3103
b6f3409b
SW		 3104 /*
3105 * 1 - adjusting old extent (we may have to split it)
3106 * 1 - add new extent
3107 * 1 - inode update
3108 */
3109 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 3110 if (IS_ERR(trans)) {
3111 ret = PTR_ERR(trans);
3112 goto out;
3113 }
3114
c8a894d7
CM		 3115 if (type == BTRFS_FILE_EXTENT_REG ||
3116 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 3117 /*
3118 * a | --- range to clone ---| b
3119 * | ------------- extent ------------- |
3120 */
3121
3122 /* substract range b */
3123 if (key.offset + datal > off + len)
3124 datal = off + len - key.offset;
3125
3126 /* substract range a */
a22285a6
YZ		 3127 if (off > key.offset) {
3128 datao += off - key.offset;
3129 datal -= off - key.offset;
3130 }
3131
5dc562c5 3132 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 3133 new_key.offset,
3134 new_key.offset + datal,
2671485d 3135 1);
79787eaa 3136 if (ret) {
3f9e3df8 3137 if (ret != -EOPNOTSUPP)
00fdf13a
LB		 3138 btrfs_abort_transaction(trans,
3139 root, ret);
79787eaa
JM		 3140 btrfs_end_transaction(trans, root);
3141 goto out;
3142 }
a22285a6 3143
c5c9cd4d
SW		 3144 ret = btrfs_insert_empty_item(trans, root, path,
3145 &new_key, size);
79787eaa
JM		 3146 if (ret) {
3147 btrfs_abort_transaction(trans, root,
3148 ret);
3149 btrfs_end_transaction(trans, root);
3150 goto out;
3151 }
c5c9cd4d
SW		 3152
3153 leaf = path->nodes[0];
3154 slot = path->slots[0];
3155 write_extent_buffer(leaf, buf,
31840ae1
ZY		 3156 btrfs_item_ptr_offset(leaf, slot),
3157 size);
ae01a0ab 3158
c5c9cd4d 3159 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 3160 struct btrfs_file_extent_item);
c5c9cd4d 3161
c5c9cd4d
SW		 3162 /* disko == 0 means it's a hole */
3163 if (!disko)
3164 datao = 0;
c5c9cd4d
SW		 3165
3166 btrfs_set_file_extent_offset(leaf, extent,
3167 datao);
3168 btrfs_set_file_extent_num_bytes(leaf, extent,
3169 datal);
fcebe456
JB		 3170
3171 /*
3172 * We need to look up the roots that point at
3173 * this bytenr and see if the new root does. If
3174 * it does not we need to make sure we update
3175 * quotas appropriately.
3176 */
3177 if (disko && root != BTRFS_I(src)->root &&
3178 disko != last_disko) {
3179 no_quota = check_ref(trans, root,
3180 disko);
3181 if (no_quota < 0) {
3182 btrfs_abort_transaction(trans,
3183 root,
3184 ret);
3185 btrfs_end_transaction(trans,
3186 root);
3187 ret = no_quota;
3188 goto out;
3189 }
3190 }
3191
c5c9cd4d
SW		 3192 if (disko) {
3193 inode_add_bytes(inode, datal);
ae01a0ab 3194 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 3195 disko, diskl, 0,
3196 root->root_key.objectid,
33345d01 3197 btrfs_ino(inode),
66d7e7f0 3198 new_key.offset - datao,
fcebe456 3199 no_quota);
79787eaa
JM		 3200 if (ret) {
3201 btrfs_abort_transaction(trans,
3202 root,
3203 ret);
3204 btrfs_end_transaction(trans,
3205 root);
3206 goto out;
3207
3208 }
f46b5a66 3209 }
c5c9cd4d
SW		 3210 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3211 u64 skip = 0;
3212 u64 trim = 0;
d3ecfcdf
LB		 3213 u64 aligned_end = 0;
3214
c5c9cd4d
SW		 3215 if (off > key.offset) {
3216 skip = off - key.offset;
3217 new_key.offset += skip;
3218 }
d397712b 3219
aa42ffd9
LB		 3220 if (key.offset + datal > off + len)
3221 trim = key.offset + datal - (off + len);
d397712b 3222
c5c9cd4d 3223 if (comp && (skip || trim)) {
c5c9cd4d 3224 ret = -EINVAL;
a22285a6 3225 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 3226 goto out;
3227 }
3228 size -= skip + trim;
3229 datal -= skip + trim;
a22285a6 3230
d3ecfcdf
LB		 3231 aligned_end = ALIGN(new_key.offset + datal,
3232 root->sectorsize);
5dc562c5 3233 ret = btrfs_drop_extents(trans, root, inode,
a22285a6 3234 new_key.offset,
d3ecfcdf 3235 aligned_end,
2671485d 3236 1);
79787eaa 3237 if (ret) {
3f9e3df8 3238 if (ret != -EOPNOTSUPP)
3a29bc09
CM		 3239 btrfs_abort_transaction(trans,
3240 root, ret);
79787eaa
JM		 3241 btrfs_end_transaction(trans, root);
3242 goto out;
3243 }
a22285a6 3244
c5c9cd4d
SW		 3245 ret = btrfs_insert_empty_item(trans, root, path,
3246 &new_key, size);
79787eaa
JM		 3247 if (ret) {
3248 btrfs_abort_transaction(trans, root,
3249 ret);
3250 btrfs_end_transaction(trans, root);
3251 goto out;
3252 }
c5c9cd4d
SW		 3253
3254 if (skip) {
d397712b
CM		 3255 u32 start =
3256 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 3257 memmove(buf+start, buf+start+skip,
3258 datal);
3259 }
3260
3261 leaf = path->nodes[0];
3262 slot = path->slots[0];
3263 write_extent_buffer(leaf, buf,
3264 btrfs_item_ptr_offset(leaf, slot),
3265 size);
3266 inode_add_bytes(inode, datal);
f46b5a66 3267 }
c5c9cd4d
SW		 3268
3269 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 3270 btrfs_release_path(path);
c5c9cd4d 3271
0c4d2d95 3272 inode_inc_iversion(inode);
a22285a6 3273 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 3274
3275 /*
3276 * we round up to the block size at eof when
3277 * determining which extents to clone above,
3278 * but shouldn't round up the file size
3279 */
3280 endoff = new_key.offset + datal;
5f3888ff
LZ		 3281 if (endoff > destoff+olen)
3282 endoff = destoff+olen;
b5384d48
SW		 3283 if (endoff > inode->i_size)
3284 btrfs_i_size_write(inode, endoff);
3285
a22285a6 3286 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 3287 if (ret) {
3288 btrfs_abort_transaction(trans, root, ret);
3289 btrfs_end_transaction(trans, root);
3290 goto out;
3291 }
3292 ret = btrfs_end_transaction(trans, root);
a22285a6 3293 }
b3b4aa74 3294 btrfs_release_path(path);
f46b5a66 3295 key.offset++;
f46b5a66 3296 }
f46b5a66 3297 ret = 0;
32b7c687 3298
f46b5a66 3299out:
b3b4aa74 3300 btrfs_release_path(path);
32b7c687
MF		 3301 btrfs_free_path(path);
3302 vfree(buf);
3303 return ret;
3304}
3305
3306static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3307 u64 off, u64 olen, u64 destoff)
3308{
54563d41 3309 struct inode *inode = file_inode(file);
32b7c687
MF		 3310 struct btrfs_root *root = BTRFS_I(inode)->root;
3311 struct fd src_file;
3312 struct inode *src;
3313 int ret;
3314 u64 len = olen;
3315 u64 bs = root->fs_info->sb->s_blocksize;
3316 int same_inode = 0;
3317
3318 /*
3319 * TODO:
3320 * - split compressed inline extents. annoying: we need to
3321 * decompress into destination's address_space (the file offset
3322 * may change, so source mapping won't do), then recompress (or
3323 * otherwise reinsert) a subrange.
00fdf13a
LB		 3324 *
3325 * - split destination inode's inline extents. The inline extents can
3326 * be either compressed or non-compressed.
32b7c687
MF		 3327 */
3328
3329 /* the destination must be opened for writing */
3330 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3331 return -EINVAL;
3332
3333 if (btrfs_root_readonly(root))
3334 return -EROFS;
3335
3336 ret = mnt_want_write_file(file);
3337 if (ret)
3338 return ret;
3339
3340 src_file = fdget(srcfd);
3341 if (!src_file.file) {
3342 ret = -EBADF;
3343 goto out_drop_write;
3344 }
3345
3346 ret = -EXDEV;
3347 if (src_file.file->f_path.mnt != file->f_path.mnt)
3348 goto out_fput;
3349
3350 src = file_inode(src_file.file);
3351
3352 ret = -EINVAL;
3353 if (src == inode)
3354 same_inode = 1;
3355
3356 /* the src must be open for reading */
3357 if (!(src_file.file->f_mode & FMODE_READ))
3358 goto out_fput;
3359
3360 /* don't make the dst file partly checksummed */
3361 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3362 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3363 goto out_fput;
3364
3365 ret = -EISDIR;
3366 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3367 goto out_fput;
3368
3369 ret = -EXDEV;
3370 if (src->i_sb != inode->i_sb)
3371 goto out_fput;
3372
3373 if (!same_inode) {
3374 if (inode < src) {
3375 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3376 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3377 } else {
3378 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3379 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3380 }
3381 } else {
3382 mutex_lock(&src->i_mutex);
3383 }
3384
3385 /* determine range to clone */
3386 ret = -EINVAL;
3387 if (off + len > src->i_size || off + len < off)
3388 goto out_unlock;
3389 if (len == 0)
3390 olen = len = src->i_size - off;
3391 /* if we extend to eof, continue to block boundary */
3392 if (off + len == src->i_size)
3393 len = ALIGN(src->i_size, bs) - off;
3394
3395 /* verify the end result is block aligned */
3396 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3397 !IS_ALIGNED(destoff, bs))
3398 goto out_unlock;
3399
3400 /* verify if ranges are overlapped within the same file */
3401 if (same_inode) {
3402 if (destoff + len > off && destoff < off + len)
3403 goto out_unlock;
3404 }
3405
3406 if (destoff > inode->i_size) {
3407 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3408 if (ret)
3409 goto out_unlock;
3410 }
3411
3412 /* truncate page cache pages from target inode range */
3413 truncate_inode_pages_range(&inode->i_data, destoff,
3414 PAGE_CACHE_ALIGN(destoff + len) - 1);
3415
3416 lock_extent_range(src, off, len);
3417
3418 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3419
aa42ffd9 3420 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66 3421out_unlock:
c57c2b3e
FDBM		 3422 if (!same_inode) {
3423 if (inode < src) {
3424 mutex_unlock(&src->i_mutex);
3425 mutex_unlock(&inode->i_mutex);
3426 } else {
3427 mutex_unlock(&inode->i_mutex);
3428 mutex_unlock(&src->i_mutex);
3429 }
3430 } else {
3431 mutex_unlock(&src->i_mutex);
3432 }
f46b5a66 3433out_fput:
2903ff01 3434 fdput(src_file);
ab67b7c1 3435out_drop_write:
2a79f17e 3436 mnt_drop_write_file(file);
f46b5a66
CH		 3437 return ret;
3438}
3439
7a865e8a 3440static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 3441{
3442 struct btrfs_ioctl_clone_range_args args;
3443
7a865e8a 3444 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 3445 return -EFAULT;
3446 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3447 args.src_length, args.dest_offset);
3448}
3449
f46b5a66
CH		 3450/*
3451 * there are many ways the trans_start and trans_end ioctls can lead
3452 * to deadlocks. They should only be used by applications that
3453 * basically own the machine, and have a very in depth understanding
3454 * of all the possible deadlocks and enospc problems.
3455 */
b2950863 3456static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66 3457{
496ad9aa 3458 struct inode *inode = file_inode(file);
f46b5a66
CH		 3459 struct btrfs_root *root = BTRFS_I(inode)->root;
3460 struct btrfs_trans_handle *trans;
1ab86aed 3461 int ret;
f46b5a66 3462
1ab86aed 3463 ret = -EPERM;
df5b5520 3464 if (!capable(CAP_SYS_ADMIN))
1ab86aed 3465 goto out;
df5b5520 3466
1ab86aed
SW		 3467 ret = -EINPROGRESS;
3468 if (file->private_data)
f46b5a66 3469 goto out;
9ca9ee09 3470
b83cc969
LZ		 3471 ret = -EROFS;
3472 if (btrfs_root_readonly(root))
3473 goto out;
3474
a561be71 3475 ret = mnt_want_write_file(file);
c146afad
YZ		 3476 if (ret)
3477 goto out;
3478
a4abeea4 3479 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 3480
1ab86aed 3481 ret = -ENOMEM;
7a7eaa40 3482 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 3483 if (IS_ERR(trans))
1ab86aed
SW		 3484 goto out_drop;
3485
3486 file->private_data = trans;
3487 return 0;
3488
3489out_drop:
a4abeea4 3490 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 3491 mnt_drop_write_file(file);
f46b5a66 3492out:
f46b5a66
CH		 3493 return ret;
3494}
3495
6ef5ed0d
JB		 3496static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3497{
496ad9aa 3498 struct inode *inode = file_inode(file);
6ef5ed0d
JB		 3499 struct btrfs_root *root = BTRFS_I(inode)->root;
3500 struct btrfs_root *new_root;
3501 struct btrfs_dir_item *di;
3502 struct btrfs_trans_handle *trans;
3503 struct btrfs_path *path;
3504 struct btrfs_key location;
3505 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 3506 u64 objectid = 0;
3507 u64 dir_id;
3c04ce01 3508 int ret;
6ef5ed0d
JB		 3509
3510 if (!capable(CAP_SYS_ADMIN))
3511 return -EPERM;
3512
3c04ce01
MX		 3513 ret = mnt_want_write_file(file);
3514 if (ret)
3515 return ret;
3516
3517 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3518 ret = -EFAULT;
3519 goto out;
3520 }
6ef5ed0d
JB		 3521
3522 if (!objectid)
1cecf579 3523 objectid = BTRFS_FS_TREE_OBJECTID;
6ef5ed0d
JB		 3524
3525 location.objectid = objectid;
3526 location.type = BTRFS_ROOT_ITEM_KEY;
3527 location.offset = (u64)-1;
3528
3529 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3c04ce01
MX		 3530 if (IS_ERR(new_root)) {
3531 ret = PTR_ERR(new_root);
3532 goto out;
3533 }
6ef5ed0d 3534
6ef5ed0d 3535 path = btrfs_alloc_path();
3c04ce01
MX		 3536 if (!path) {
3537 ret = -ENOMEM;
3538 goto out;
3539 }
6ef5ed0d
JB		 3540 path->leave_spinning = 1;
3541
3542 trans = btrfs_start_transaction(root, 1);
98d5dc13 3543 if (IS_ERR(trans)) {
6ef5ed0d 3544 btrfs_free_path(path);
3c04ce01
MX		 3545 ret = PTR_ERR(trans);
3546 goto out;
6ef5ed0d
JB		 3547 }
3548
6c41761f 3549 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 3550 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3551 dir_id, "default", 7, 1);
cf1e99a4 3552 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 3553 btrfs_free_path(path);
3554 btrfs_end_transaction(trans, root);
efe120a0
FH		 3555 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3556 "item, this isn't going to work");
3c04ce01
MX		 3557 ret = -ENOENT;
3558 goto out;
6ef5ed0d
JB		 3559 }
3560
3561 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3562 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3563 btrfs_mark_buffer_dirty(path->nodes[0]);
3564 btrfs_free_path(path);
3565
2b0ce2c2 3566 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d 3567 btrfs_end_transaction(trans, root);
3c04ce01
MX		 3568out:
3569 mnt_drop_write_file(file);
3570 return ret;
6ef5ed0d
JB		 3571}
3572
5af3e8cc
SB		 3573void btrfs_get_block_group_info(struct list_head *groups_list,
3574 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 3575{
3576 struct btrfs_block_group_cache *block_group;
3577
3578 space->total_bytes = 0;
3579 space->used_bytes = 0;
3580 space->flags = 0;
3581 list_for_each_entry(block_group, groups_list, list) {
3582 space->flags = block_group->flags;
3583 space->total_bytes += block_group->key.offset;
3584 space->used_bytes +=
3585 btrfs_block_group_used(&block_group->item);
3586 }
3587}
3588
48a3b636 3589static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1406e432
JB		 3590{
3591 struct btrfs_ioctl_space_args space_args;
3592 struct btrfs_ioctl_space_info space;
3593 struct btrfs_ioctl_space_info *dest;
7fde62bf 3594 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 3595 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 3596 struct btrfs_space_info *info;
bf5fc093
JB		 3597 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3598 BTRFS_BLOCK_GROUP_SYSTEM,
3599 BTRFS_BLOCK_GROUP_METADATA,
3600 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3601 int num_types = 4;
7fde62bf 3602 int alloc_size;
1406e432 3603 int ret = 0;
51788b1b 3604 u64 slot_count = 0;
bf5fc093 3605 int i, c;
1406e432
JB		 3606
3607 if (copy_from_user(&space_args,
3608 (struct btrfs_ioctl_space_args __user *)arg,
3609 sizeof(space_args)))
3610 return -EFAULT;
3611
bf5fc093
JB		 3612 for (i = 0; i < num_types; i++) {
3613 struct btrfs_space_info *tmp;
3614
3615 info = NULL;
3616 rcu_read_lock();
3617 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3618 list) {
3619 if (tmp->flags == types[i]) {
3620 info = tmp;
3621 break;
3622 }
3623 }
3624 rcu_read_unlock();
3625
3626 if (!info)
3627 continue;
3628
3629 down_read(&info->groups_sem);
3630 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3631 if (!list_empty(&info->block_groups[c]))
3632 slot_count++;
3633 }
3634 up_read(&info->groups_sem);
3635 }
7fde62bf 3636
36523e95
DS		 3637 /*
3638 * Global block reserve, exported as a space_info
3639 */
3640 slot_count++;
3641
7fde62bf
CM		 3642 /* space_slots == 0 means they are asking for a count */
3643 if (space_args.space_slots == 0) {
3644 space_args.total_spaces = slot_count;
3645 goto out;
3646 }
bf5fc093 3647
51788b1b 3648 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 3649
7fde62bf 3650 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 3651
7fde62bf
CM		 3652 /* we generally have at most 6 or so space infos, one for each raid
3653 * level. So, a whole page should be more than enough for everyone
3654 */
3655 if (alloc_size > PAGE_CACHE_SIZE)
3656 return -ENOMEM;
3657
1406e432 3658 space_args.total_spaces = 0;
7fde62bf
CM		 3659 dest = kmalloc(alloc_size, GFP_NOFS);
3660 if (!dest)
3661 return -ENOMEM;
3662 dest_orig = dest;
1406e432 3663
7fde62bf 3664 /* now we have a buffer to copy into */
bf5fc093
JB		 3665 for (i = 0; i < num_types; i++) {
3666 struct btrfs_space_info *tmp;
3667
51788b1b
DR		 3668 if (!slot_count)
3669 break;
3670
bf5fc093
JB		 3671 info = NULL;
3672 rcu_read_lock();
3673 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3674 list) {
3675 if (tmp->flags == types[i]) {
3676 info = tmp;
3677 break;
3678 }
3679 }
3680 rcu_read_unlock();
7fde62bf 3681
bf5fc093
JB		 3682 if (!info)
3683 continue;
3684 down_read(&info->groups_sem);
3685 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3686 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 3687 btrfs_get_block_group_info(
3688 &info->block_groups[c], &space);
bf5fc093
JB		 3689 memcpy(dest, &space, sizeof(space));
3690 dest++;
3691 space_args.total_spaces++;
51788b1b 3692 slot_count--;
bf5fc093 3693 }
51788b1b
DR		 3694 if (!slot_count)
3695 break;
bf5fc093
JB		 3696 }
3697 up_read(&info->groups_sem);
1406e432 3698 }
1406e432 3699
36523e95
DS		 3700 /*
3701 * Add global block reserve
3702 */
3703 if (slot_count) {
3704 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
3705
3706 spin_lock(&block_rsv->lock);
3707 space.total_bytes = block_rsv->size;
3708 space.used_bytes = block_rsv->size - block_rsv->reserved;
3709 spin_unlock(&block_rsv->lock);
3710 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3711 memcpy(dest, &space, sizeof(space));
3712 space_args.total_spaces++;
3713 }
3714
2eec6c81 3715 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3716 (arg + sizeof(struct btrfs_ioctl_space_args));
3717
3718 if (copy_to_user(user_dest, dest_orig, alloc_size))
3719 ret = -EFAULT;
3720
3721 kfree(dest_orig);
3722out:
3723 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3724 ret = -EFAULT;
3725
3726 return ret;
3727}
3728
f46b5a66
CH		 3729/*
3730 * there are many ways the trans_start and trans_end ioctls can lead
3731 * to deadlocks. They should only be used by applications that
3732 * basically own the machine, and have a very in depth understanding
3733 * of all the possible deadlocks and enospc problems.
3734 */
3735long btrfs_ioctl_trans_end(struct file *file)
3736{
496ad9aa 3737 struct inode *inode = file_inode(file);
f46b5a66
CH		 3738 struct btrfs_root *root = BTRFS_I(inode)->root;
3739 struct btrfs_trans_handle *trans;
f46b5a66 3740
f46b5a66 3741 trans = file->private_data;
1ab86aed
SW		 3742 if (!trans)
3743 return -EINVAL;
b214107e 3744 file->private_data = NULL;
9ca9ee09 3745
1ab86aed
SW		 3746 btrfs_end_transaction(trans, root);
3747
a4abeea4 3748 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3749
2a79f17e 3750 mnt_drop_write_file(file);
1ab86aed 3751 return 0;
f46b5a66
CH		 3752}
3753
9a8c28be
MX		 3754static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3755 void __user *argp)
46204592 3756{
46204592
SW		 3757 struct btrfs_trans_handle *trans;
3758 u64 transid;
db5b493a 3759 int ret;
46204592 3760
d4edf39b 3761 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 3762 if (IS_ERR(trans)) {
3763 if (PTR_ERR(trans) != -ENOENT)
3764 return PTR_ERR(trans);
3765
3766 /* No running transaction, don't bother */
3767 transid = root->fs_info->last_trans_committed;
3768 goto out;
3769 }
46204592 3770 transid = trans->transid;
db5b493a 3771 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3772 if (ret) {
3773 btrfs_end_transaction(trans, root);
db5b493a 3774 return ret;
8b2b2d3c 3775 }
ff7c1d33 3776out:
46204592
SW		 3777 if (argp)
3778 if (copy_to_user(argp, &transid, sizeof(transid)))
3779 return -EFAULT;
3780 return 0;
3781}
3782
9a8c28be
MX		 3783static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3784 void __user *argp)
46204592 3785{
46204592
SW		 3786 u64 transid;
3787
3788 if (argp) {
3789 if (copy_from_user(&transid, argp, sizeof(transid)))
3790 return -EFAULT;
3791 } else {
3792 transid = 0; /* current trans */
3793 }
3794 return btrfs_wait_for_commit(root, transid);
3795}
3796
b8e95489 3797static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 3798{
496ad9aa 3799 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
475f6387 3800 struct btrfs_ioctl_scrub_args *sa;
b8e95489 3801 int ret;
475f6387
JS		 3802
3803 if (!capable(CAP_SYS_ADMIN))
3804 return -EPERM;
3805
3806 sa = memdup_user(arg, sizeof(*sa));
3807 if (IS_ERR(sa))
3808 return PTR_ERR(sa);
3809
b8e95489
MX		 3810 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3811 ret = mnt_want_write_file(file);
3812 if (ret)
3813 goto out;
3814 }
3815
aa1b8cd4 3816 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 3817 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3818 0);
475f6387
JS		 3819
3820 if (copy_to_user(arg, sa, sizeof(*sa)))
3821 ret = -EFAULT;
3822
b8e95489
MX		 3823 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3824 mnt_drop_write_file(file);
3825out:
475f6387
JS		 3826 kfree(sa);
3827 return ret;
3828}
3829
3830static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3831{
3832 if (!capable(CAP_SYS_ADMIN))
3833 return -EPERM;
3834
aa1b8cd4 3835 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3836}
3837
3838static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3839 void __user *arg)
3840{
3841 struct btrfs_ioctl_scrub_args *sa;
3842 int ret;
3843
3844 if (!capable(CAP_SYS_ADMIN))
3845 return -EPERM;
3846
3847 sa = memdup_user(arg, sizeof(*sa));
3848 if (IS_ERR(sa))
3849 return PTR_ERR(sa);
3850
3851 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3852
3853 if (copy_to_user(arg, sa, sizeof(*sa)))
3854 ret = -EFAULT;
3855
3856 kfree(sa);
3857 return ret;
3858}
3859
c11d2c23 3860static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3861 void __user *arg)
c11d2c23
SB		 3862{
3863 struct btrfs_ioctl_get_dev_stats *sa;
3864 int ret;
3865
c11d2c23
SB		 3866 sa = memdup_user(arg, sizeof(*sa));
3867 if (IS_ERR(sa))
3868 return PTR_ERR(sa);
3869
b27f7c0c
DS		 3870 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3871 kfree(sa);
3872 return -EPERM;
3873 }
3874
3875 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3876
3877 if (copy_to_user(arg, sa, sizeof(*sa)))
3878 ret = -EFAULT;
3879
3880 kfree(sa);
3881 return ret;
3882}
3883
3f6bcfbd
SB		 3884static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3885{
3886 struct btrfs_ioctl_dev_replace_args *p;
3887 int ret;
3888
3889 if (!capable(CAP_SYS_ADMIN))
3890 return -EPERM;
3891
3892 p = memdup_user(arg, sizeof(*p));
3893 if (IS_ERR(p))
3894 return PTR_ERR(p);
3895
3896 switch (p->cmd) {
3897 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
adfa97cb
ID		 3898 if (root->fs_info->sb->s_flags & MS_RDONLY) {
3899 ret = -EROFS;
3900 goto out;
3901 }
3f6bcfbd
SB		 3902 if (atomic_xchg(
3903 &root->fs_info->mutually_exclusive_operation_running,
3904 1)) {
e57138b3 3905 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd
SB		 3906 } else {
3907 ret = btrfs_dev_replace_start(root, p);
3908 atomic_set(
3909 &root->fs_info->mutually_exclusive_operation_running,
3910 0);
3911 }
3912 break;
3913 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3914 btrfs_dev_replace_status(root->fs_info, p);
3915 ret = 0;
3916 break;
3917 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3918 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3919 break;
3920 default:
3921 ret = -EINVAL;
3922 break;
3923 }
3924
3925 if (copy_to_user(arg, p, sizeof(*p)))
3926 ret = -EFAULT;
adfa97cb 3927out:
3f6bcfbd
SB		 3928 kfree(p);
3929 return ret;
3930}
3931
d7728c96
JS		 3932static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3933{
3934 int ret = 0;
3935 int i;
740c3d22 3936 u64 rel_ptr;
d7728c96 3937 int size;
806468f8 3938 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3939 struct inode_fs_paths *ipath = NULL;
3940 struct btrfs_path *path;
3941
82b22ac8 3942 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 3943 return -EPERM;
3944
3945 path = btrfs_alloc_path();
3946 if (!path) {
3947 ret = -ENOMEM;
3948 goto out;
3949 }
3950
3951 ipa = memdup_user(arg, sizeof(*ipa));
3952 if (IS_ERR(ipa)) {
3953 ret = PTR_ERR(ipa);
3954 ipa = NULL;
3955 goto out;
3956 }
3957
3958 size = min_t(u32, ipa->size, 4096);
3959 ipath = init_ipath(size, root, path);
3960 if (IS_ERR(ipath)) {
3961 ret = PTR_ERR(ipath);
3962 ipath = NULL;
3963 goto out;
3964 }
3965
3966 ret = paths_from_inode(ipa->inum, ipath);
3967 if (ret < 0)
3968 goto out;
3969
3970 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3971 rel_ptr = ipath->fspath->val[i] -
3972 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3973 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3974 }
3975
745c4d8e
JM		 3976 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3977 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3978 if (ret) {
3979 ret = -EFAULT;
3980 goto out;
3981 }
3982
3983out:
3984 btrfs_free_path(path);
3985 free_ipath(ipath);
3986 kfree(ipa);
3987
3988 return ret;
3989}
3990
3991static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3992{
3993 struct btrfs_data_container *inodes = ctx;
3994 const size_t c = 3 * sizeof(u64);
3995
3996 if (inodes->bytes_left >= c) {
3997 inodes->bytes_left -= c;
3998 inodes->val[inodes->elem_cnt] = inum;
3999 inodes->val[inodes->elem_cnt + 1] = offset;
4000 inodes->val[inodes->elem_cnt + 2] = root;
4001 inodes->elem_cnt += 3;
4002 } else {
4003 inodes->bytes_missing += c - inodes->bytes_left;
4004 inodes->bytes_left = 0;
4005 inodes->elem_missed += 3;
4006 }
4007
4008 return 0;
4009}
4010
4011static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
4012 void __user *arg)
4013{
4014 int ret = 0;
4015 int size;
d7728c96
JS		 4016 struct btrfs_ioctl_logical_ino_args *loi;
4017 struct btrfs_data_container *inodes = NULL;
4018 struct btrfs_path *path = NULL;
d7728c96
JS		 4019
4020 if (!capable(CAP_SYS_ADMIN))
4021 return -EPERM;
4022
4023 loi = memdup_user(arg, sizeof(*loi));
4024 if (IS_ERR(loi)) {
4025 ret = PTR_ERR(loi);
4026 loi = NULL;
4027 goto out;
4028 }
4029
4030 path = btrfs_alloc_path();
4031 if (!path) {
4032 ret = -ENOMEM;
4033 goto out;
4034 }
4035
425d17a2 4036 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 4037 inodes = init_data_container(size);
4038 if (IS_ERR(inodes)) {
4039 ret = PTR_ERR(inodes);
4040 inodes = NULL;
4041 goto out;
4042 }
4043
df031f07
LB		 4044 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
4045 build_ino_list, inodes);
4046 if (ret == -EINVAL)
d7728c96
JS		 4047 ret = -ENOENT;
4048 if (ret < 0)
4049 goto out;
4050
745c4d8e
JM		 4051 ret = copy_to_user((void *)(unsigned long)loi->inodes,
4052 (void *)(unsigned long)inodes, size);
d7728c96
JS		 4053 if (ret)
4054 ret = -EFAULT;
4055
4056out:
4057 btrfs_free_path(path);
425d17a2 4058 vfree(inodes);
d7728c96
JS		 4059 kfree(loi);
4060
4061 return ret;
4062}
4063
19a39dce 4064void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 4065 struct btrfs_ioctl_balance_args *bargs)
4066{
4067 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4068
4069 bargs->flags = bctl->flags;
4070
837d5b6e
ID		 4071 if (atomic_read(&fs_info->balance_running))
4072 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4073 if (atomic_read(&fs_info->balance_pause_req))
4074 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 4075 if (atomic_read(&fs_info->balance_cancel_req))
4076 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 4077
c9e9f97b
ID		 4078 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4079 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4080 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 4081
4082 if (lock) {
4083 spin_lock(&fs_info->balance_lock);
4084 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4085 spin_unlock(&fs_info->balance_lock);
4086 } else {
4087 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4088 }
c9e9f97b
ID		 4089}
4090
9ba1f6e4 4091static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 4092{
496ad9aa 4093 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 4094 struct btrfs_fs_info *fs_info = root->fs_info;
4095 struct btrfs_ioctl_balance_args *bargs;
4096 struct btrfs_balance_control *bctl;
ed0fb78f 4097 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 4098 int ret;
4099
4100 if (!capable(CAP_SYS_ADMIN))
4101 return -EPERM;
4102
e54bfa31 4103 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 4104 if (ret)
4105 return ret;
4106
ed0fb78f
ID		 4107again:
4108 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4109 mutex_lock(&fs_info->volume_mutex);
4110 mutex_lock(&fs_info->balance_mutex);
4111 need_unlock = true;
4112 goto locked;
4113 }
4114
4115 /*
4116 * mut. excl. ops lock is locked. Three possibilites:
4117 * (1) some other op is running
4118 * (2) balance is running
4119 * (3) balance is paused -- special case (think resume)
4120 */
c9e9f97b 4121 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 4122 if (fs_info->balance_ctl) {
4123 /* this is either (2) or (3) */
4124 if (!atomic_read(&fs_info->balance_running)) {
4125 mutex_unlock(&fs_info->balance_mutex);
4126 if (!mutex_trylock(&fs_info->volume_mutex))
4127 goto again;
4128 mutex_lock(&fs_info->balance_mutex);
4129
4130 if (fs_info->balance_ctl &&
4131 !atomic_read(&fs_info->balance_running)) {
4132 /* this is (3) */
4133 need_unlock = false;
4134 goto locked;
4135 }
4136
4137 mutex_unlock(&fs_info->balance_mutex);
4138 mutex_unlock(&fs_info->volume_mutex);
4139 goto again;
4140 } else {
4141 /* this is (2) */
4142 mutex_unlock(&fs_info->balance_mutex);
4143 ret = -EINPROGRESS;
4144 goto out;
4145 }
4146 } else {
4147 /* this is (1) */
4148 mutex_unlock(&fs_info->balance_mutex);
e57138b3 4149 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 4150 goto out;
4151 }
4152
4153locked:
4154 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
c9e9f97b
ID		 4155
4156 if (arg) {
4157 bargs = memdup_user(arg, sizeof(*bargs));
4158 if (IS_ERR(bargs)) {
4159 ret = PTR_ERR(bargs);
ed0fb78f 4160 goto out_unlock;
c9e9f97b 4161 }
de322263
ID		 4162
4163 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4164 if (!fs_info->balance_ctl) {
4165 ret = -ENOTCONN;
4166 goto out_bargs;
4167 }
4168
4169 bctl = fs_info->balance_ctl;
4170 spin_lock(&fs_info->balance_lock);
4171 bctl->flags |= BTRFS_BALANCE_RESUME;
4172 spin_unlock(&fs_info->balance_lock);
4173
4174 goto do_balance;
4175 }
c9e9f97b
ID		 4176 } else {
4177 bargs = NULL;
4178 }
4179
ed0fb78f 4180 if (fs_info->balance_ctl) {
837d5b6e
ID		 4181 ret = -EINPROGRESS;
4182 goto out_bargs;
4183 }
4184
c9e9f97b
ID		 4185 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
4186 if (!bctl) {
4187 ret = -ENOMEM;
4188 goto out_bargs;
4189 }
4190
4191 bctl->fs_info = fs_info;
4192 if (arg) {
4193 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4194 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4195 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4196
4197 bctl->flags = bargs->flags;
f43ffb60
ID		 4198 } else {
4199 /* balance everything - no filters */
4200 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 4201 }
4202
de322263 4203do_balance:
c9e9f97b 4204 /*
ed0fb78f
ID		 4205 * Ownership of bctl and mutually_exclusive_operation_running
4206 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4207 * or, if restriper was paused all the way until unmount, in
4208 * free_fs_info. mutually_exclusive_operation_running is
4209 * cleared in __cancel_balance.
c9e9f97b 4210 */
ed0fb78f
ID		 4211 need_unlock = false;
4212
4213 ret = btrfs_balance(bctl, bargs);
4214
c9e9f97b
ID		 4215 if (arg) {
4216 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4217 ret = -EFAULT;
4218 }
4219
4220out_bargs:
4221 kfree(bargs);
ed0fb78f 4222out_unlock:
c9e9f97b
ID		 4223 mutex_unlock(&fs_info->balance_mutex);
4224 mutex_unlock(&fs_info->volume_mutex);
ed0fb78f
ID		 4225 if (need_unlock)
4226 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4227out:
e54bfa31 4228 mnt_drop_write_file(file);
c9e9f97b
ID		 4229 return ret;
4230}
4231
837d5b6e
ID		 4232static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4233{
4234 if (!capable(CAP_SYS_ADMIN))
4235 return -EPERM;
4236
4237 switch (cmd) {
4238 case BTRFS_BALANCE_CTL_PAUSE:
4239 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 4240 case BTRFS_BALANCE_CTL_CANCEL:
4241 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 4242 }
4243
4244 return -EINVAL;
4245}
4246
19a39dce
ID		 4247static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4248 void __user *arg)
4249{
4250 struct btrfs_fs_info *fs_info = root->fs_info;
4251 struct btrfs_ioctl_balance_args *bargs;
4252 int ret = 0;
4253
4254 if (!capable(CAP_SYS_ADMIN))
4255 return -EPERM;
4256
4257 mutex_lock(&fs_info->balance_mutex);
4258 if (!fs_info->balance_ctl) {
4259 ret = -ENOTCONN;
4260 goto out;
4261 }
4262
4263 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4264 if (!bargs) {
4265 ret = -ENOMEM;
4266 goto out;
4267 }
4268
4269 update_ioctl_balance_args(fs_info, 1, bargs);
4270
4271 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4272 ret = -EFAULT;
4273
4274 kfree(bargs);
4275out:
4276 mutex_unlock(&fs_info->balance_mutex);
4277 return ret;
4278}
4279
905b0dda 4280static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4281{
496ad9aa 4282 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4283 struct btrfs_ioctl_quota_ctl_args *sa;
4284 struct btrfs_trans_handle *trans = NULL;
4285 int ret;
4286 int err;
4287
4288 if (!capable(CAP_SYS_ADMIN))
4289 return -EPERM;
4290
905b0dda
MX		 4291 ret = mnt_want_write_file(file);
4292 if (ret)
4293 return ret;
5d13a37b
AJ		 4294
4295 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4296 if (IS_ERR(sa)) {
4297 ret = PTR_ERR(sa);
4298 goto drop_write;
4299 }
5d13a37b 4300
7708f029 4301 down_write(&root->fs_info->subvol_sem);
2f232036
JS		 4302 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4303 if (IS_ERR(trans)) {
4304 ret = PTR_ERR(trans);
4305 goto out;
5d13a37b
AJ		 4306 }
4307
4308 switch (sa->cmd) {
4309 case BTRFS_QUOTA_CTL_ENABLE:
4310 ret = btrfs_quota_enable(trans, root->fs_info);
4311 break;
4312 case BTRFS_QUOTA_CTL_DISABLE:
4313 ret = btrfs_quota_disable(trans, root->fs_info);
4314 break;
5d13a37b
AJ		 4315 default:
4316 ret = -EINVAL;
4317 break;
4318 }
4319
2f232036
JS		 4320 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4321 if (err && !ret)
4322 ret = err;
5d13a37b
AJ		 4323out:
4324 kfree(sa);
7708f029 4325 up_write(&root->fs_info->subvol_sem);
905b0dda
MX		 4326drop_write:
4327 mnt_drop_write_file(file);
5d13a37b
AJ		 4328 return ret;
4329}
4330
905b0dda 4331static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4332{
496ad9aa 4333 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4334 struct btrfs_ioctl_qgroup_assign_args *sa;
4335 struct btrfs_trans_handle *trans;
4336 int ret;
4337 int err;
4338
4339 if (!capable(CAP_SYS_ADMIN))
4340 return -EPERM;
4341
905b0dda
MX		 4342 ret = mnt_want_write_file(file);
4343 if (ret)
4344 return ret;
5d13a37b
AJ		 4345
4346 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4347 if (IS_ERR(sa)) {
4348 ret = PTR_ERR(sa);
4349 goto drop_write;
4350 }
5d13a37b
AJ		 4351
4352 trans = btrfs_join_transaction(root);
4353 if (IS_ERR(trans)) {
4354 ret = PTR_ERR(trans);
4355 goto out;
4356 }
4357
4358 /* FIXME: check if the IDs really exist */
4359 if (sa->assign) {
4360 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4361 sa->src, sa->dst);
4362 } else {
4363 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4364 sa->src, sa->dst);
4365 }
4366
4367 err = btrfs_end_transaction(trans, root);
4368 if (err && !ret)
4369 ret = err;
4370
4371out:
4372 kfree(sa);
905b0dda
MX		 4373drop_write:
4374 mnt_drop_write_file(file);
5d13a37b
AJ		 4375 return ret;
4376}
4377
905b0dda 4378static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4379{
496ad9aa 4380 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4381 struct btrfs_ioctl_qgroup_create_args *sa;
4382 struct btrfs_trans_handle *trans;
4383 int ret;
4384 int err;
4385
4386 if (!capable(CAP_SYS_ADMIN))
4387 return -EPERM;
4388
905b0dda
MX		 4389 ret = mnt_want_write_file(file);
4390 if (ret)
4391 return ret;
5d13a37b
AJ		 4392
4393 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4394 if (IS_ERR(sa)) {
4395 ret = PTR_ERR(sa);
4396 goto drop_write;
4397 }
5d13a37b 4398
d86e56cf
MX		 4399 if (!sa->qgroupid) {
4400 ret = -EINVAL;
4401 goto out;
4402 }
4403
5d13a37b
AJ		 4404 trans = btrfs_join_transaction(root);
4405 if (IS_ERR(trans)) {
4406 ret = PTR_ERR(trans);
4407 goto out;
4408 }
4409
4410 /* FIXME: check if the IDs really exist */
4411 if (sa->create) {
4412 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4413 NULL);
4414 } else {
4415 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4416 }
4417
4418 err = btrfs_end_transaction(trans, root);
4419 if (err && !ret)
4420 ret = err;
4421
4422out:
4423 kfree(sa);
905b0dda
MX		 4424drop_write:
4425 mnt_drop_write_file(file);
5d13a37b
AJ		 4426 return ret;
4427}
4428
905b0dda 4429static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4430{
496ad9aa 4431 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4432 struct btrfs_ioctl_qgroup_limit_args *sa;
4433 struct btrfs_trans_handle *trans;
4434 int ret;
4435 int err;
4436 u64 qgroupid;
4437
4438 if (!capable(CAP_SYS_ADMIN))
4439 return -EPERM;
4440
905b0dda
MX		 4441 ret = mnt_want_write_file(file);
4442 if (ret)
4443 return ret;
5d13a37b
AJ		 4444
4445 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4446 if (IS_ERR(sa)) {
4447 ret = PTR_ERR(sa);
4448 goto drop_write;
4449 }
5d13a37b
AJ		 4450
4451 trans = btrfs_join_transaction(root);
4452 if (IS_ERR(trans)) {
4453 ret = PTR_ERR(trans);
4454 goto out;
4455 }
4456
4457 qgroupid = sa->qgroupid;
4458 if (!qgroupid) {
4459 /* take the current subvol as qgroup */
4460 qgroupid = root->root_key.objectid;
4461 }
4462
4463 /* FIXME: check if the IDs really exist */
4464 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4465
4466 err = btrfs_end_transaction(trans, root);
4467 if (err && !ret)
4468 ret = err;
4469
4470out:
4471 kfree(sa);
905b0dda
MX		 4472drop_write:
4473 mnt_drop_write_file(file);
5d13a37b
AJ		 4474 return ret;
4475}
4476
2f232036
JS		 4477static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4478{
6d0379ec 4479 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4480 struct btrfs_ioctl_quota_rescan_args *qsa;
4481 int ret;
4482
4483 if (!capable(CAP_SYS_ADMIN))
4484 return -EPERM;
4485
4486 ret = mnt_want_write_file(file);
4487 if (ret)
4488 return ret;
4489
4490 qsa = memdup_user(arg, sizeof(*qsa));
4491 if (IS_ERR(qsa)) {
4492 ret = PTR_ERR(qsa);
4493 goto drop_write;
4494 }
4495
4496 if (qsa->flags) {
4497 ret = -EINVAL;
4498 goto out;
4499 }
4500
4501 ret = btrfs_qgroup_rescan(root->fs_info);
4502
4503out:
4504 kfree(qsa);
4505drop_write:
4506 mnt_drop_write_file(file);
4507 return ret;
4508}
4509
4510static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4511{
6d0379ec 4512 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4513 struct btrfs_ioctl_quota_rescan_args *qsa;
4514 int ret = 0;
4515
4516 if (!capable(CAP_SYS_ADMIN))
4517 return -EPERM;
4518
4519 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4520 if (!qsa)
4521 return -ENOMEM;
4522
4523 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4524 qsa->flags = 1;
4525 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4526 }
4527
4528 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4529 ret = -EFAULT;
4530
4531 kfree(qsa);
4532 return ret;
4533}
4534
57254b6e
JS		 4535static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4536{
54563d41 4537 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
57254b6e
JS		 4538
4539 if (!capable(CAP_SYS_ADMIN))
4540 return -EPERM;
4541
4542 return btrfs_qgroup_wait_for_completion(root->fs_info);
4543}
4544
abccd00f
HM		 4545static long _btrfs_ioctl_set_received_subvol(struct file *file,
4546 struct btrfs_ioctl_received_subvol_args *sa)
8ea05e3a 4547{
496ad9aa 4548 struct inode *inode = file_inode(file);
8ea05e3a
AB		 4549 struct btrfs_root *root = BTRFS_I(inode)->root;
4550 struct btrfs_root_item *root_item = &root->root_item;
4551 struct btrfs_trans_handle *trans;
4552 struct timespec ct = CURRENT_TIME;
4553 int ret = 0;
dd5f9615 4554 int received_uuid_changed;
8ea05e3a 4555
bd60ea0f
DS		 4556 if (!inode_owner_or_capable(inode))
4557 return -EPERM;
4558
8ea05e3a
AB		 4559 ret = mnt_want_write_file(file);
4560 if (ret < 0)
4561 return ret;
4562
4563 down_write(&root->fs_info->subvol_sem);
4564
4565 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4566 ret = -EINVAL;
4567 goto out;
4568 }
4569
4570 if (btrfs_root_readonly(root)) {
4571 ret = -EROFS;
4572 goto out;
4573 }
4574
dd5f9615
SB		 4575 /*
4576 * 1 - root item
4577 * 2 - uuid items (received uuid + subvol uuid)
4578 */
4579 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 4580 if (IS_ERR(trans)) {
4581 ret = PTR_ERR(trans);
4582 trans = NULL;
4583 goto out;
4584 }
4585
4586 sa->rtransid = trans->transid;
4587 sa->rtime.sec = ct.tv_sec;
4588 sa->rtime.nsec = ct.tv_nsec;
4589
dd5f9615
SB		 4590 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4591 BTRFS_UUID_SIZE);
4592 if (received_uuid_changed &&
4593 !btrfs_is_empty_uuid(root_item->received_uuid))
4594 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4595 root_item->received_uuid,
4596 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4597 root->root_key.objectid);
8ea05e3a
AB		 4598 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4599 btrfs_set_root_stransid(root_item, sa->stransid);
4600 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 4601 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4602 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4603 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4604 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a
AB		 4605
4606 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4607 &root->root_key, &root->root_item);
4608 if (ret < 0) {
4609 btrfs_end_transaction(trans, root);
8ea05e3a 4610 goto out;
dd5f9615
SB		 4611 }
4612 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4613 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4614 sa->uuid,
4615 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4616 root->root_key.objectid);
4617 if (ret < 0 && ret != -EEXIST) {
4618 btrfs_abort_transaction(trans, root, ret);
8ea05e3a 4619 goto out;
dd5f9615
SB		 4620 }
4621 }
4622 ret = btrfs_commit_transaction(trans, root);
4623 if (ret < 0) {
4624 btrfs_abort_transaction(trans, root, ret);
4625 goto out;
8ea05e3a
AB		 4626 }
4627
abccd00f
HM		 4628out:
4629 up_write(&root->fs_info->subvol_sem);
4630 mnt_drop_write_file(file);
4631 return ret;
4632}
4633
4634#ifdef CONFIG_64BIT
4635static long btrfs_ioctl_set_received_subvol_32(struct file *file,
4636 void __user *arg)
4637{
4638 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
4639 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
4640 int ret = 0;
4641
4642 args32 = memdup_user(arg, sizeof(*args32));
4643 if (IS_ERR(args32)) {
4644 ret = PTR_ERR(args32);
4645 args32 = NULL;
4646 goto out;
4647 }
4648
4649 args64 = kmalloc(sizeof(*args64), GFP_NOFS);
84dbeb87
DC		 4650 if (!args64) {
4651 ret = -ENOMEM;
abccd00f
HM		 4652 goto out;
4653 }
4654
4655 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
4656 args64->stransid = args32->stransid;
4657 args64->rtransid = args32->rtransid;
4658 args64->stime.sec = args32->stime.sec;
4659 args64->stime.nsec = args32->stime.nsec;
4660 args64->rtime.sec = args32->rtime.sec;
4661 args64->rtime.nsec = args32->rtime.nsec;
4662 args64->flags = args32->flags;
4663
4664 ret = _btrfs_ioctl_set_received_subvol(file, args64);
4665 if (ret)
4666 goto out;
4667
4668 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
4669 args32->stransid = args64->stransid;
4670 args32->rtransid = args64->rtransid;
4671 args32->stime.sec = args64->stime.sec;
4672 args32->stime.nsec = args64->stime.nsec;
4673 args32->rtime.sec = args64->rtime.sec;
4674 args32->rtime.nsec = args64->rtime.nsec;
4675 args32->flags = args64->flags;
4676
4677 ret = copy_to_user(arg, args32, sizeof(*args32));
4678 if (ret)
4679 ret = -EFAULT;
4680
4681out:
4682 kfree(args32);
4683 kfree(args64);
4684 return ret;
4685}
4686#endif
4687
4688static long btrfs_ioctl_set_received_subvol(struct file *file,
4689 void __user *arg)
4690{
4691 struct btrfs_ioctl_received_subvol_args *sa = NULL;
4692 int ret = 0;
4693
4694 sa = memdup_user(arg, sizeof(*sa));
4695 if (IS_ERR(sa)) {
4696 ret = PTR_ERR(sa);
4697 sa = NULL;
4698 goto out;
4699 }
4700
4701 ret = _btrfs_ioctl_set_received_subvol(file, sa);
4702
4703 if (ret)
4704 goto out;
4705
8ea05e3a
AB		 4706 ret = copy_to_user(arg, sa, sizeof(*sa));
4707 if (ret)
4708 ret = -EFAULT;
4709
4710out:
4711 kfree(sa);
8ea05e3a
AB		 4712 return ret;
4713}
4714
867ab667 4715static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4716{
6d0379ec 4717 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a1b83ac5 4718 size_t len;
867ab667 4719 int ret;
a1b83ac5
AJ		 4720 char label[BTRFS_LABEL_SIZE];
4721
4722 spin_lock(&root->fs_info->super_lock);
4723 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4724 spin_unlock(&root->fs_info->super_lock);
4725
4726 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 4727
4728 if (len == BTRFS_LABEL_SIZE) {
efe120a0
FH		 4729 btrfs_warn(root->fs_info,
4730 "label is too long, return the first %zu bytes", --len);
867ab667 4731 }
4732
867ab667 4733 ret = copy_to_user(arg, label, len);
867ab667 4734
4735 return ret ? -EFAULT : 0;
4736}
4737
a8bfd4ab 4738static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4739{
6d0379ec 4740 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a8bfd4ab 4741 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4742 struct btrfs_trans_handle *trans;
4743 char label[BTRFS_LABEL_SIZE];
4744 int ret;
4745
4746 if (!capable(CAP_SYS_ADMIN))
4747 return -EPERM;
4748
4749 if (copy_from_user(label, arg, sizeof(label)))
4750 return -EFAULT;
4751
4752 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
efe120a0 4753 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
a8bfd4ab 4754 BTRFS_LABEL_SIZE - 1);
4755 return -EINVAL;
4756 }
4757
4758 ret = mnt_want_write_file(file);
4759 if (ret)
4760 return ret;
4761
a8bfd4ab 4762 trans = btrfs_start_transaction(root, 0);
4763 if (IS_ERR(trans)) {
4764 ret = PTR_ERR(trans);
4765 goto out_unlock;
4766 }
4767
a1b83ac5 4768 spin_lock(&root->fs_info->super_lock);
a8bfd4ab 4769 strcpy(super_block->label, label);
a1b83ac5 4770 spin_unlock(&root->fs_info->super_lock);
d0270aca 4771 ret = btrfs_commit_transaction(trans, root);
a8bfd4ab 4772
4773out_unlock:
a8bfd4ab 4774 mnt_drop_write_file(file);
4775 return ret;
4776}
4777
2eaa055f
JM		 4778#define INIT_FEATURE_FLAGS(suffix) \
4779 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4780 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4781 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4782
4783static int btrfs_ioctl_get_supported_features(struct file *file,
4784 void __user *arg)
4785{
4786 static struct btrfs_ioctl_feature_flags features[3] = {
4787 INIT_FEATURE_FLAGS(SUPP),
4788 INIT_FEATURE_FLAGS(SAFE_SET),
4789 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4790 };
4791
4792 if (copy_to_user(arg, &features, sizeof(features)))
4793 return -EFAULT;
4794
4795 return 0;
4796}
4797
4798static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
4799{
4800 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4801 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4802 struct btrfs_ioctl_feature_flags features;
4803
4804 features.compat_flags = btrfs_super_compat_flags(super_block);
4805 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4806 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4807
4808 if (copy_to_user(arg, &features, sizeof(features)))
4809 return -EFAULT;
4810
4811 return 0;
4812}
4813
3b02a68a
JM		 4814static int check_feature_bits(struct btrfs_root *root,
4815 enum btrfs_feature_set set,
2eaa055f
JM		 4816 u64 change_mask, u64 flags, u64 supported_flags,
4817 u64 safe_set, u64 safe_clear)
4818{
3b02a68a
JM		 4819 const char *type = btrfs_feature_set_names[set];
4820 char *names;
2eaa055f
JM		 4821 u64 disallowed, unsupported;
4822 u64 set_mask = flags & change_mask;
4823 u64 clear_mask = ~flags & change_mask;
4824
4825 unsupported = set_mask & ~supported_flags;
4826 if (unsupported) {
3b02a68a
JM		 4827 names = btrfs_printable_features(set, unsupported);
4828 if (names) {
4829 btrfs_warn(root->fs_info,
4830 "this kernel does not support the %s feature bit%s",
4831 names, strchr(names, ',') ? "s" : "");
4832 kfree(names);
4833 } else
4834 btrfs_warn(root->fs_info,
2eaa055f
JM		 4835 "this kernel does not support %s bits 0x%llx",
4836 type, unsupported);
4837 return -EOPNOTSUPP;
4838 }
4839
4840 disallowed = set_mask & ~safe_set;
4841 if (disallowed) {
3b02a68a
JM		 4842 names = btrfs_printable_features(set, disallowed);
4843 if (names) {
4844 btrfs_warn(root->fs_info,
4845 "can't set the %s feature bit%s while mounted",
4846 names, strchr(names, ',') ? "s" : "");
4847 kfree(names);
4848 } else
4849 btrfs_warn(root->fs_info,
2eaa055f
JM		 4850 "can't set %s bits 0x%llx while mounted",
4851 type, disallowed);
4852 return -EPERM;
4853 }
4854
4855 disallowed = clear_mask & ~safe_clear;
4856 if (disallowed) {
3b02a68a
JM		 4857 names = btrfs_printable_features(set, disallowed);
4858 if (names) {
4859 btrfs_warn(root->fs_info,
4860 "can't clear the %s feature bit%s while mounted",
4861 names, strchr(names, ',') ? "s" : "");
4862 kfree(names);
4863 } else
4864 btrfs_warn(root->fs_info,
2eaa055f
JM		 4865 "can't clear %s bits 0x%llx while mounted",
4866 type, disallowed);
4867 return -EPERM;
4868 }
4869
4870 return 0;
4871}
4872
4873#define check_feature(root, change_mask, flags, mask_base) \
3b02a68a 4874check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
2eaa055f
JM		 4875 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4876 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4877 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4878
4879static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4880{
4881 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4882 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4883 struct btrfs_ioctl_feature_flags flags[2];
4884 struct btrfs_trans_handle *trans;
4885 u64 newflags;
4886 int ret;
4887
4888 if (!capable(CAP_SYS_ADMIN))
4889 return -EPERM;
4890
4891 if (copy_from_user(flags, arg, sizeof(flags)))
4892 return -EFAULT;
4893
4894 /* Nothing to do */
4895 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4896 !flags[0].incompat_flags)
4897 return 0;
4898
4899 ret = check_feature(root, flags[0].compat_flags,
4900 flags[1].compat_flags, COMPAT);
4901 if (ret)
4902 return ret;
4903
4904 ret = check_feature(root, flags[0].compat_ro_flags,
4905 flags[1].compat_ro_flags, COMPAT_RO);
4906 if (ret)
4907 return ret;
4908
4909 ret = check_feature(root, flags[0].incompat_flags,
4910 flags[1].incompat_flags, INCOMPAT);
4911 if (ret)
4912 return ret;
4913
8051aa1a 4914 trans = btrfs_start_transaction(root, 0);
2eaa055f
JM		 4915 if (IS_ERR(trans))
4916 return PTR_ERR(trans);
4917
4918 spin_lock(&root->fs_info->super_lock);
4919 newflags = btrfs_super_compat_flags(super_block);
4920 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4921 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4922 btrfs_set_super_compat_flags(super_block, newflags);
4923
4924 newflags = btrfs_super_compat_ro_flags(super_block);
4925 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4926 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4927 btrfs_set_super_compat_ro_flags(super_block, newflags);
4928
4929 newflags = btrfs_super_incompat_flags(super_block);
4930 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4931 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4932 btrfs_set_super_incompat_flags(super_block, newflags);
4933 spin_unlock(&root->fs_info->super_lock);
4934
d0270aca 4935 return btrfs_commit_transaction(trans, root);
2eaa055f
JM		 4936}
4937
f46b5a66
CH		 4938long btrfs_ioctl(struct file *file, unsigned int
4939 cmd, unsigned long arg)
4940{
496ad9aa 4941 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4bcabaa3 4942 void __user *argp = (void __user *)arg;
f46b5a66
CH		 4943
4944 switch (cmd) {
6cbff00f
CH		 4945 case FS_IOC_GETFLAGS:
4946 return btrfs_ioctl_getflags(file, argp);
4947 case FS_IOC_SETFLAGS:
4948 return btrfs_ioctl_setflags(file, argp);
4949 case FS_IOC_GETVERSION:
4950 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 4951 case FITRIM:
4952 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 4953 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 4954 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 4955 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 4956 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 4957 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 4958 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 4959 case BTRFS_IOC_SUBVOL_CREATE_V2:
4960 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 4961 case BTRFS_IOC_SNAP_DESTROY:
4962 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 4963 case BTRFS_IOC_SUBVOL_GETFLAGS:
4964 return btrfs_ioctl_subvol_getflags(file, argp);
4965 case BTRFS_IOC_SUBVOL_SETFLAGS:
4966 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 4967 case BTRFS_IOC_DEFAULT_SUBVOL:
4968 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 4969 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 4970 return btrfs_ioctl_defrag(file, NULL);
4971 case BTRFS_IOC_DEFRAG_RANGE:
4972 return btrfs_ioctl_defrag(file, argp);
f46b5a66 4973 case BTRFS_IOC_RESIZE:
198605a8 4974 return btrfs_ioctl_resize(file, argp);
f46b5a66 4975 case BTRFS_IOC_ADD_DEV:
4bcabaa3 4976 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 4977 case BTRFS_IOC_RM_DEV:
da24927b 4978 return btrfs_ioctl_rm_dev(file, argp);
475f6387
JS		 4979 case BTRFS_IOC_FS_INFO:
4980 return btrfs_ioctl_fs_info(root, argp);
4981 case BTRFS_IOC_DEV_INFO:
4982 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 4983 case BTRFS_IOC_BALANCE:
9ba1f6e4 4984 return btrfs_ioctl_balance(file, NULL);
f46b5a66 4985 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 4986 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4987 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 4988 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 4989 case BTRFS_IOC_TRANS_START:
4990 return btrfs_ioctl_trans_start(file);
4991 case BTRFS_IOC_TRANS_END:
4992 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 4993 case BTRFS_IOC_TREE_SEARCH:
4994 return btrfs_ioctl_tree_search(file, argp);
4995 case BTRFS_IOC_INO_LOOKUP:
4996 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 4997 case BTRFS_IOC_INO_PATHS:
4998 return btrfs_ioctl_ino_to_path(root, argp);
4999 case BTRFS_IOC_LOGICAL_INO:
5000 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 5001 case BTRFS_IOC_SPACE_INFO:
5002 return btrfs_ioctl_space_info(root, argp);
9b199859
FDBM		 5003 case BTRFS_IOC_SYNC: {
5004 int ret;
5005
6c255e67 5006 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
9b199859
FDBM		 5007 if (ret)
5008 return ret;
5009 ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
5010 return ret;
5011 }
46204592 5012 case BTRFS_IOC_START_SYNC:
9a8c28be 5013 return btrfs_ioctl_start_sync(root, argp);
46204592 5014 case BTRFS_IOC_WAIT_SYNC:
9a8c28be 5015 return btrfs_ioctl_wait_sync(root, argp);
475f6387 5016 case BTRFS_IOC_SCRUB:
b8e95489 5017 return btrfs_ioctl_scrub(file, argp);
475f6387
JS		 5018 case BTRFS_IOC_SCRUB_CANCEL:
5019 return btrfs_ioctl_scrub_cancel(root, argp);
5020 case BTRFS_IOC_SCRUB_PROGRESS:
5021 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 5022 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 5023 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 5024 case BTRFS_IOC_BALANCE_CTL:
5025 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 5026 case BTRFS_IOC_BALANCE_PROGRESS:
5027 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 5028 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5029 return btrfs_ioctl_set_received_subvol(file, argp);
abccd00f
HM		 5030#ifdef CONFIG_64BIT
5031 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5032 return btrfs_ioctl_set_received_subvol_32(file, argp);
5033#endif
31db9f7c
AB		 5034 case BTRFS_IOC_SEND:
5035 return btrfs_ioctl_send(file, argp);
c11d2c23 5036 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 5037 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b 5038 case BTRFS_IOC_QUOTA_CTL:
905b0dda 5039 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 5040 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 5041 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 5042 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 5043 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 5044 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 5045 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 5046 case BTRFS_IOC_QUOTA_RESCAN:
5047 return btrfs_ioctl_quota_rescan(file, argp);
5048 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5049 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 5050 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5051 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd
SB		 5052 case BTRFS_IOC_DEV_REPLACE:
5053 return btrfs_ioctl_dev_replace(root, argp);
867ab667 5054 case BTRFS_IOC_GET_FSLABEL:
5055 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 5056 case BTRFS_IOC_SET_FSLABEL:
5057 return btrfs_ioctl_set_fslabel(file, argp);
416161db
MF		 5058 case BTRFS_IOC_FILE_EXTENT_SAME:
5059 return btrfs_ioctl_file_extent_same(file, argp);
2eaa055f
JM		 5060 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5061 return btrfs_ioctl_get_supported_features(file, argp);
5062 case BTRFS_IOC_GET_FEATURES:
5063 return btrfs_ioctl_get_features(file, argp);
5064 case BTRFS_IOC_SET_FEATURES:
5065 return btrfs_ioctl_set_features(file, argp);
f46b5a66
CH		 5066 }
5067
5068 return -ENOTTY;
5069}
Arne's tree of linux kernel.