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Btrfs: faster file extent item replace operations
[linux-block.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"
3b02a68a 59#include "sysfs.h"
f46b5a66 60
416161db
MF		 61static int btrfs_clone(struct inode *src, struct inode *inode,
62 u64 off, u64 olen, u64 olen_aligned, u64 destoff);
63
6cbff00f
CH		 64/* Mask out flags that are inappropriate for the given type of inode. */
65static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
66{
67 if (S_ISDIR(mode))
68 return flags;
69 else if (S_ISREG(mode))
70 return flags & ~FS_DIRSYNC_FL;
71 else
72 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
73}
74
75/*
76 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
77 */
78static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
79{
80 unsigned int iflags = 0;
81
82 if (flags & BTRFS_INODE_SYNC)
83 iflags |= FS_SYNC_FL;
84 if (flags & BTRFS_INODE_IMMUTABLE)
85 iflags |= FS_IMMUTABLE_FL;
86 if (flags & BTRFS_INODE_APPEND)
87 iflags |= FS_APPEND_FL;
88 if (flags & BTRFS_INODE_NODUMP)
89 iflags |= FS_NODUMP_FL;
90 if (flags & BTRFS_INODE_NOATIME)
91 iflags |= FS_NOATIME_FL;
92 if (flags & BTRFS_INODE_DIRSYNC)
93 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 94 if (flags & BTRFS_INODE_NODATACOW)
95 iflags |= FS_NOCOW_FL;
96
97 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
98 iflags |= FS_COMPR_FL;
99 else if (flags & BTRFS_INODE_NOCOMPRESS)
100 iflags |= FS_NOCOMP_FL;
6cbff00f
CH		 101
102 return iflags;
103}
104
105/*
106 * Update inode->i_flags based on the btrfs internal flags.
107 */
108void btrfs_update_iflags(struct inode *inode)
109{
110 struct btrfs_inode *ip = BTRFS_I(inode);
111
112 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
113
114 if (ip->flags & BTRFS_INODE_SYNC)
115 inode->i_flags |= S_SYNC;
116 if (ip->flags & BTRFS_INODE_IMMUTABLE)
117 inode->i_flags |= S_IMMUTABLE;
118 if (ip->flags & BTRFS_INODE_APPEND)
119 inode->i_flags |= S_APPEND;
120 if (ip->flags & BTRFS_INODE_NOATIME)
121 inode->i_flags |= S_NOATIME;
122 if (ip->flags & BTRFS_INODE_DIRSYNC)
123 inode->i_flags |= S_DIRSYNC;
124}
125
126/*
127 * Inherit flags from the parent inode.
128 *
e27425d6 129 * Currently only the compression flags and the cow flags are inherited.
6cbff00f
CH		 130 */
131void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
132{
0b4dcea5
CM		 133 unsigned int flags;
134
135 if (!dir)
136 return;
137
138 flags = BTRFS_I(dir)->flags;
6cbff00f 139
e27425d6
JB		 140 if (flags & BTRFS_INODE_NOCOMPRESS) {
141 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
142 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
143 } else if (flags & BTRFS_INODE_COMPRESS) {
144 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
145 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
146 }
147
213490b3 148 if (flags & BTRFS_INODE_NODATACOW) {
e27425d6 149 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
213490b3
LB		 150 if (S_ISREG(inode->i_mode))
151 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
152 }
6cbff00f 153
6cbff00f
CH		 154 btrfs_update_iflags(inode);
155}
156
157static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
158{
496ad9aa 159 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
6cbff00f
CH		 160 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
161
162 if (copy_to_user(arg, &flags, sizeof(flags)))
163 return -EFAULT;
164 return 0;
165}
166
75e7cb7f
LB		 167static int check_flags(unsigned int flags)
168{
169 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
170 FS_NOATIME_FL | FS_NODUMP_FL | \
171 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 172 FS_NOCOMP_FL | FS_COMPR_FL |
173 FS_NOCOW_FL))
75e7cb7f
LB		 174 return -EOPNOTSUPP;
175
176 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
177 return -EINVAL;
178
75e7cb7f
LB		 179 return 0;
180}
181
6cbff00f
CH		 182static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
183{
496ad9aa 184 struct inode *inode = file_inode(file);
6cbff00f
CH		 185 struct btrfs_inode *ip = BTRFS_I(inode);
186 struct btrfs_root *root = ip->root;
187 struct btrfs_trans_handle *trans;
188 unsigned int flags, oldflags;
189 int ret;
f062abf0
LZ		 190 u64 ip_oldflags;
191 unsigned int i_oldflags;
7e97b8da 192 umode_t mode;
6cbff00f 193
b83cc969
LZ		 194 if (btrfs_root_readonly(root))
195 return -EROFS;
196
6cbff00f
CH		 197 if (copy_from_user(&flags, arg, sizeof(flags)))
198 return -EFAULT;
199
75e7cb7f
LB		 200 ret = check_flags(flags);
201 if (ret)
202 return ret;
f46b5a66 203
2e149670 204 if (!inode_owner_or_capable(inode))
6cbff00f
CH		 205 return -EACCES;
206
e7848683
JK		 207 ret = mnt_want_write_file(file);
208 if (ret)
209 return ret;
210
6cbff00f
CH		 211 mutex_lock(&inode->i_mutex);
212
f062abf0
LZ		 213 ip_oldflags = ip->flags;
214 i_oldflags = inode->i_flags;
7e97b8da 215 mode = inode->i_mode;
f062abf0 216
6cbff00f
CH		 217 flags = btrfs_mask_flags(inode->i_mode, flags);
218 oldflags = btrfs_flags_to_ioctl(ip->flags);
219 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
220 if (!capable(CAP_LINUX_IMMUTABLE)) {
221 ret = -EPERM;
222 goto out_unlock;
223 }
224 }
225
6cbff00f
CH		 226 if (flags & FS_SYNC_FL)
227 ip->flags |= BTRFS_INODE_SYNC;
228 else
229 ip->flags &= ~BTRFS_INODE_SYNC;
230 if (flags & FS_IMMUTABLE_FL)
231 ip->flags |= BTRFS_INODE_IMMUTABLE;
232 else
233 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
234 if (flags & FS_APPEND_FL)
235 ip->flags |= BTRFS_INODE_APPEND;
236 else
237 ip->flags &= ~BTRFS_INODE_APPEND;
238 if (flags & FS_NODUMP_FL)
239 ip->flags |= BTRFS_INODE_NODUMP;
240 else
241 ip->flags &= ~BTRFS_INODE_NODUMP;
242 if (flags & FS_NOATIME_FL)
243 ip->flags |= BTRFS_INODE_NOATIME;
244 else
245 ip->flags &= ~BTRFS_INODE_NOATIME;
246 if (flags & FS_DIRSYNC_FL)
247 ip->flags |= BTRFS_INODE_DIRSYNC;
248 else
249 ip->flags &= ~BTRFS_INODE_DIRSYNC;
7e97b8da
DS		 250 if (flags & FS_NOCOW_FL) {
251 if (S_ISREG(mode)) {
252 /*
253 * It's safe to turn csums off here, no extents exist.
254 * Otherwise we want the flag to reflect the real COW
255 * status of the file and will not set it.
256 */
257 if (inode->i_size == 0)
258 ip->flags |= BTRFS_INODE_NODATACOW
259 | BTRFS_INODE_NODATASUM;
260 } else {
261 ip->flags |= BTRFS_INODE_NODATACOW;
262 }
263 } else {
264 /*
265 * Revert back under same assuptions as above
266 */
267 if (S_ISREG(mode)) {
268 if (inode->i_size == 0)
269 ip->flags &= ~(BTRFS_INODE_NODATACOW
270 | BTRFS_INODE_NODATASUM);
271 } else {
272 ip->flags &= ~BTRFS_INODE_NODATACOW;
273 }
274 }
6cbff00f 275
75e7cb7f
LB		 276 /*
277 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
278 * flag may be changed automatically if compression code won't make
279 * things smaller.
280 */
281 if (flags & FS_NOCOMP_FL) {
282 ip->flags &= ~BTRFS_INODE_COMPRESS;
283 ip->flags |= BTRFS_INODE_NOCOMPRESS;
284 } else if (flags & FS_COMPR_FL) {
285 ip->flags |= BTRFS_INODE_COMPRESS;
286 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
ebcb904d
LZ		 287 } else {
288 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 289 }
6cbff00f 290
4da6f1a3 291 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 292 if (IS_ERR(trans)) {
293 ret = PTR_ERR(trans);
294 goto out_drop;
295 }
6cbff00f 296
306424cc 297 btrfs_update_iflags(inode);
0c4d2d95 298 inode_inc_iversion(inode);
306424cc 299 inode->i_ctime = CURRENT_TIME;
6cbff00f 300 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 301
6cbff00f 302 btrfs_end_transaction(trans, root);
f062abf0
LZ		 303 out_drop:
304 if (ret) {
305 ip->flags = ip_oldflags;
306 inode->i_flags = i_oldflags;
307 }
6cbff00f 308
6cbff00f
CH		 309 out_unlock:
310 mutex_unlock(&inode->i_mutex);
e7848683 311 mnt_drop_write_file(file);
2d4e6f6a 312 return ret;
6cbff00f
CH		 313}
314
315static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
316{
496ad9aa 317 struct inode *inode = file_inode(file);
6cbff00f
CH		 318
319 return put_user(inode->i_generation, arg);
320}
f46b5a66 321
f7039b1d
LD		 322static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
323{
54563d41 324 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
f7039b1d
LD		 325 struct btrfs_device *device;
326 struct request_queue *q;
327 struct fstrim_range range;
328 u64 minlen = ULLONG_MAX;
329 u64 num_devices = 0;
815745cf 330 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
f7039b1d
LD		 331 int ret;
332
333 if (!capable(CAP_SYS_ADMIN))
334 return -EPERM;
335
1f78160c
XG		 336 rcu_read_lock();
337 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
338 dev_list) {
f7039b1d
LD		 339 if (!device->bdev)
340 continue;
341 q = bdev_get_queue(device->bdev);
342 if (blk_queue_discard(q)) {
343 num_devices++;
344 minlen = min((u64)q->limits.discard_granularity,
345 minlen);
346 }
347 }
1f78160c 348 rcu_read_unlock();
f4c697e6 349
f7039b1d
LD		 350 if (!num_devices)
351 return -EOPNOTSUPP;
f7039b1d
LD		 352 if (copy_from_user(&range, arg, sizeof(range)))
353 return -EFAULT;
e515c18b
LC		 354 if (range.start > total_bytes ||
355 range.len < fs_info->sb->s_blocksize)
f4c697e6 356 return -EINVAL;
f7039b1d 357
f4c697e6 358 range.len = min(range.len, total_bytes - range.start);
f7039b1d 359 range.minlen = max(range.minlen, minlen);
815745cf 360 ret = btrfs_trim_fs(fs_info->tree_root, &range);
f7039b1d
LD		 361 if (ret < 0)
362 return ret;
363
364 if (copy_to_user(arg, &range, sizeof(range)))
365 return -EFAULT;
366
367 return 0;
368}
369
dd5f9615
SB		 370int btrfs_is_empty_uuid(u8 *uuid)
371{
46e0f66a
CM		 372 int i;
373
374 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
375 if (uuid[i])
376 return 0;
377 }
378 return 1;
dd5f9615
SB		 379}
380
d5c12070 381static noinline int create_subvol(struct inode *dir,
cb8e7090 382 struct dentry *dentry,
72fd032e 383 char *name, int namelen,
6f72c7e2 384 u64 *async_transid,
8696c533 385 struct btrfs_qgroup_inherit *inherit)
f46b5a66
CH		 386{
387 struct btrfs_trans_handle *trans;
388 struct btrfs_key key;
389 struct btrfs_root_item root_item;
390 struct btrfs_inode_item *inode_item;
391 struct extent_buffer *leaf;
d5c12070 392 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 393 struct btrfs_root *new_root;
d5c12070 394 struct btrfs_block_rsv block_rsv;
8ea05e3a 395 struct timespec cur_time = CURRENT_TIME;
5662344b 396 struct inode *inode;
f46b5a66
CH		 397 int ret;
398 int err;
399 u64 objectid;
400 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 401 u64 index = 0;
d5c12070 402 u64 qgroup_reserved;
8ea05e3a 403 uuid_le new_uuid;
f46b5a66 404
581bb050 405 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
2fbe8c8a 406 if (ret)
a22285a6 407 return ret;
6a912213 408
d5c12070 409 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 410 /*
d5c12070
MX		 411 * The same as the snapshot creation, please see the comment
412 * of create_snapshot().
9ed74f2d 413 */
d5c12070 414 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
dd5f9615 415 8, &qgroup_reserved, false);
d5c12070
MX		 416 if (ret)
417 return ret;
418
419 trans = btrfs_start_transaction(root, 0);
420 if (IS_ERR(trans)) {
421 ret = PTR_ERR(trans);
422 goto out;
423 }
424 trans->block_rsv = &block_rsv;
425 trans->bytes_reserved = block_rsv.size;
f46b5a66 426
8696c533 427 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
6f72c7e2
AJ		 428 if (ret)
429 goto fail;
430
5d4f98a2 431 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
5581a51a 432 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 433 if (IS_ERR(leaf)) {
434 ret = PTR_ERR(leaf);
435 goto fail;
436 }
f46b5a66 437
5d4f98a2 438 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
f46b5a66
CH		 439 btrfs_set_header_bytenr(leaf, leaf->start);
440 btrfs_set_header_generation(leaf, trans->transid);
5d4f98a2 441 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
f46b5a66
CH		 442 btrfs_set_header_owner(leaf, objectid);
443
0a4e5586 444 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
f46b5a66 445 BTRFS_FSID_SIZE);
5d4f98a2 446 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
b308bc2f 447 btrfs_header_chunk_tree_uuid(leaf),
5d4f98a2 448 BTRFS_UUID_SIZE);
f46b5a66
CH		 449 btrfs_mark_buffer_dirty(leaf);
450
8ea05e3a
AB		 451 memset(&root_item, 0, sizeof(root_item));
452
f46b5a66 453 inode_item = &root_item.inode;
3cae210f
QW		 454 btrfs_set_stack_inode_generation(inode_item, 1);
455 btrfs_set_stack_inode_size(inode_item, 3);
456 btrfs_set_stack_inode_nlink(inode_item, 1);
457 btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
458 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
f46b5a66 459
3cae210f
QW		 460 btrfs_set_root_flags(&root_item, 0);
461 btrfs_set_root_limit(&root_item, 0);
462 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
08fe4db1 463
f46b5a66 464 btrfs_set_root_bytenr(&root_item, leaf->start);
84234f3a 465 btrfs_set_root_generation(&root_item, trans->transid);
f46b5a66
CH		 466 btrfs_set_root_level(&root_item, 0);
467 btrfs_set_root_refs(&root_item, 1);
86b9f2ec 468 btrfs_set_root_used(&root_item, leaf->len);
80ff3856 469 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66 470
8ea05e3a
AB		 471 btrfs_set_root_generation_v2(&root_item,
472 btrfs_root_generation(&root_item));
473 uuid_le_gen(&new_uuid);
474 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
3cae210f
QW		 475 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
476 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
8ea05e3a
AB		 477 root_item.ctime = root_item.otime;
478 btrfs_set_root_ctransid(&root_item, trans->transid);
479 btrfs_set_root_otransid(&root_item, trans->transid);
f46b5a66 480
925baedd 481 btrfs_tree_unlock(leaf);
f46b5a66
CH		 482 free_extent_buffer(leaf);
483 leaf = NULL;
484
485 btrfs_set_root_dirid(&root_item, new_dirid);
486
487 key.objectid = objectid;
5d4f98a2 488 key.offset = 0;
f46b5a66
CH		 489 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
490 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
491 &root_item);
492 if (ret)
493 goto fail;
494
76dda93c
YZ		 495 key.offset = (u64)-1;
496 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
79787eaa
JM		 497 if (IS_ERR(new_root)) {
498 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
499 ret = PTR_ERR(new_root);
500 goto fail;
501 }
76dda93c
YZ		 502
503 btrfs_record_root_in_trans(trans, new_root);
504
d82a6f1d 505 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
ce598979
MF		 506 if (ret) {
507 /* We potentially lose an unused inode item here */
79787eaa 508 btrfs_abort_transaction(trans, root, ret);
ce598979
MF		 509 goto fail;
510 }
511
f46b5a66
CH		 512 /*
513 * insert the directory item
514 */
3de4586c 515 ret = btrfs_set_inode_index(dir, &index);
79787eaa
JM		 516 if (ret) {
517 btrfs_abort_transaction(trans, root, ret);
518 goto fail;
519 }
3de4586c
CM		 520
521 ret = btrfs_insert_dir_item(trans, root,
16cdcec7 522 name, namelen, dir, &key,
3de4586c 523 BTRFS_FT_DIR, index);
79787eaa
JM		 524 if (ret) {
525 btrfs_abort_transaction(trans, root, ret);
f46b5a66 526 goto fail;
79787eaa 527 }
0660b5af 528
52c26179
YZ		 529 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
530 ret = btrfs_update_inode(trans, root, dir);
531 BUG_ON(ret);
532
0660b5af 533 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4df27c4d 534 objectid, root->root_key.objectid,
33345d01 535 btrfs_ino(dir), index, name, namelen);
76dda93c 536 BUG_ON(ret);
f46b5a66 537
dd5f9615
SB		 538 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
539 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
540 objectid);
541 if (ret)
542 btrfs_abort_transaction(trans, root, ret);
543
f46b5a66 544fail:
d5c12070
MX		 545 trans->block_rsv = NULL;
546 trans->bytes_reserved = 0;
72fd032e
SW		 547 if (async_transid) {
548 *async_transid = trans->transid;
549 err = btrfs_commit_transaction_async(trans, root, 1);
00d71c9c
MX		 550 if (err)
551 err = btrfs_commit_transaction(trans, root);
72fd032e
SW		 552 } else {
553 err = btrfs_commit_transaction(trans, root);
554 }
f46b5a66
CH		 555 if (err && !ret)
556 ret = err;
1a65e24b 557
5662344b
TI		 558 if (!ret) {
559 inode = btrfs_lookup_dentry(dir, dentry);
560 if (IS_ERR(inode)) {
561 ret = PTR_ERR(inode);
562 goto out;
563 }
564 d_instantiate(dentry, inode);
565 }
d5c12070
MX		 566out:
567 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
f46b5a66
CH		 568 return ret;
569}
570
e9662f70
MX		 571static int create_snapshot(struct btrfs_root *root, struct inode *dir,
572 struct dentry *dentry, char *name, int namelen,
573 u64 *async_transid, bool readonly,
574 struct btrfs_qgroup_inherit *inherit)
f46b5a66 575{
2e4bfab9 576 struct inode *inode;
f46b5a66
CH		 577 struct btrfs_pending_snapshot *pending_snapshot;
578 struct btrfs_trans_handle *trans;
2e4bfab9 579 int ret;
f46b5a66
CH		 580
581 if (!root->ref_cows)
582 return -EINVAL;
583
6a03843d
MX		 584 ret = btrfs_start_delalloc_inodes(root, 0);
585 if (ret)
586 return ret;
587
b0244199 588 btrfs_wait_ordered_extents(root, -1);
6a03843d 589
3de4586c 590 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
a22285a6
YZ		 591 if (!pending_snapshot)
592 return -ENOMEM;
593
66d8f3dd
MX		 594 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
595 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 596 /*
597 * 1 - parent dir inode
598 * 2 - dir entries
599 * 1 - root item
600 * 2 - root ref/backref
601 * 1 - root of snapshot
dd5f9615 602 * 1 - UUID item
d5c12070
MX		 603 */
604 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
dd5f9615 605 &pending_snapshot->block_rsv, 8,
ee3441b4
JM		 606 &pending_snapshot->qgroup_reserved,
607 false);
d5c12070
MX		 608 if (ret)
609 goto out;
610
3de4586c 611 pending_snapshot->dentry = dentry;
f46b5a66 612 pending_snapshot->root = root;
b83cc969 613 pending_snapshot->readonly = readonly;
e9662f70 614 pending_snapshot->dir = dir;
8696c533 615 pending_snapshot->inherit = inherit;
a22285a6 616
d5c12070 617 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 618 if (IS_ERR(trans)) {
619 ret = PTR_ERR(trans);
620 goto fail;
621 }
622
8351583e 623 spin_lock(&root->fs_info->trans_lock);
f46b5a66
CH		 624 list_add(&pending_snapshot->list,
625 &trans->transaction->pending_snapshots);
8351583e 626 spin_unlock(&root->fs_info->trans_lock);
72fd032e
SW		 627 if (async_transid) {
628 *async_transid = trans->transid;
629 ret = btrfs_commit_transaction_async(trans,
630 root->fs_info->extent_root, 1);
00d71c9c
MX		 631 if (ret)
632 ret = btrfs_commit_transaction(trans, root);
72fd032e
SW		 633 } else {
634 ret = btrfs_commit_transaction(trans,
635 root->fs_info->extent_root);
636 }
aec8030a 637 if (ret)
c37b2b62 638 goto fail;
a22285a6
YZ		 639
640 ret = pending_snapshot->error;
641 if (ret)
642 goto fail;
643
66b4ffd1
JB		 644 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
645 if (ret)
646 goto fail;
f46b5a66 647
2fbe8c8a 648 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 649 if (IS_ERR(inode)) {
650 ret = PTR_ERR(inode);
651 goto fail;
652 }
5662344b 653
2e4bfab9
YZ		 654 d_instantiate(dentry, inode);
655 ret = 0;
656fail:
d5c12070
MX		 657 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
658 &pending_snapshot->block_rsv,
659 pending_snapshot->qgroup_reserved);
660out:
a22285a6 661 kfree(pending_snapshot);
f46b5a66
CH		 662 return ret;
663}
664
4260f7c7
SW		 665/* copy of check_sticky in fs/namei.c()
666* It's inline, so penalty for filesystems that don't use sticky bit is
667* minimal.
668*/
669static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
670{
2f2f43d3 671 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 672
673 if (!(dir->i_mode & S_ISVTX))
674 return 0;
2f2f43d3 675 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 676 return 0;
2f2f43d3 677 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 678 return 0;
679 return !capable(CAP_FOWNER);
680}
681
682/* copy of may_delete in fs/namei.c()
683 * Check whether we can remove a link victim from directory dir, check
684 * whether the type of victim is right.
685 * 1. We can't do it if dir is read-only (done in permission())
686 * 2. We should have write and exec permissions on dir
687 * 3. We can't remove anything from append-only dir
688 * 4. We can't do anything with immutable dir (done in permission())
689 * 5. If the sticky bit on dir is set we should either
690 * a. be owner of dir, or
691 * b. be owner of victim, or
692 * c. have CAP_FOWNER capability
693 * 6. If the victim is append-only or immutable we can't do antyhing with
694 * links pointing to it.
695 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
696 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
697 * 9. We can't remove a root or mountpoint.
698 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
699 * nfs_async_unlink().
700 */
701
67871254 702static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
4260f7c7
SW		 703{
704 int error;
705
706 if (!victim->d_inode)
707 return -ENOENT;
708
709 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 710 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 711
712 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
713 if (error)
714 return error;
715 if (IS_APPEND(dir))
716 return -EPERM;
717 if (btrfs_check_sticky(dir, victim->d_inode)||
718 IS_APPEND(victim->d_inode)||
719 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
720 return -EPERM;
721 if (isdir) {
722 if (!S_ISDIR(victim->d_inode->i_mode))
723 return -ENOTDIR;
724 if (IS_ROOT(victim))
725 return -EBUSY;
726 } else if (S_ISDIR(victim->d_inode->i_mode))
727 return -EISDIR;
728 if (IS_DEADDIR(dir))
729 return -ENOENT;
730 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
731 return -EBUSY;
732 return 0;
733}
734
cb8e7090
CH		 735/* copy of may_create in fs/namei.c() */
736static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
737{
738 if (child->d_inode)
739 return -EEXIST;
740 if (IS_DEADDIR(dir))
741 return -ENOENT;
742 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
743}
744
745/*
746 * Create a new subvolume below @parent. This is largely modeled after
747 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
748 * inside this filesystem so it's quite a bit simpler.
749 */
76dda93c
YZ		 750static noinline int btrfs_mksubvol(struct path *parent,
751 char *name, int namelen,
72fd032e 752 struct btrfs_root *snap_src,
6f72c7e2 753 u64 *async_transid, bool readonly,
8696c533 754 struct btrfs_qgroup_inherit *inherit)
cb8e7090 755{
76dda93c 756 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 757 struct dentry *dentry;
758 int error;
759
5c50c9b8
DS		 760 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
761 if (error == -EINTR)
762 return error;
cb8e7090
CH		 763
764 dentry = lookup_one_len(name, parent->dentry, namelen);
765 error = PTR_ERR(dentry);
766 if (IS_ERR(dentry))
767 goto out_unlock;
768
769 error = -EEXIST;
770 if (dentry->d_inode)
771 goto out_dput;
772
76dda93c 773 error = btrfs_may_create(dir, dentry);
cb8e7090 774 if (error)
a874a63e 775 goto out_dput;
cb8e7090 776
9c52057c
CM		 777 /*
778 * even if this name doesn't exist, we may get hash collisions.
779 * check for them now when we can safely fail
780 */
781 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
782 dir->i_ino, name,
783 namelen);
784 if (error)
785 goto out_dput;
786
76dda93c
YZ		 787 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
788
789 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
790 goto out_up_read;
791
3de4586c 792 if (snap_src) {
e9662f70 793 error = create_snapshot(snap_src, dir, dentry, name, namelen,
6f72c7e2 794 async_transid, readonly, inherit);
3de4586c 795 } else {
d5c12070
MX		 796 error = create_subvol(dir, dentry, name, namelen,
797 async_transid, inherit);
3de4586c 798 }
76dda93c
YZ		 799 if (!error)
800 fsnotify_mkdir(dir, dentry);
801out_up_read:
802 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 803out_dput:
804 dput(dentry);
805out_unlock:
76dda93c 806 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 807 return error;
808}
809
4cb5300b
CM		 810/*
811 * When we're defragging a range, we don't want to kick it off again
812 * if it is really just waiting for delalloc to send it down.
813 * If we find a nice big extent or delalloc range for the bytes in the
814 * file you want to defrag, we return 0 to let you know to skip this
815 * part of the file
816 */
817static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
818{
819 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
820 struct extent_map *em = NULL;
821 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
822 u64 end;
823
824 read_lock(&em_tree->lock);
825 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
826 read_unlock(&em_tree->lock);
827
828 if (em) {
829 end = extent_map_end(em);
830 free_extent_map(em);
831 if (end - offset > thresh)
832 return 0;
833 }
834 /* if we already have a nice delalloc here, just stop */
835 thresh /= 2;
836 end = count_range_bits(io_tree, &offset, offset + thresh,
837 thresh, EXTENT_DELALLOC, 1);
838 if (end >= thresh)
839 return 0;
840 return 1;
841}
842
843/*
844 * helper function to walk through a file and find extents
845 * newer than a specific transid, and smaller than thresh.
846 *
847 * This is used by the defragging code to find new and small
848 * extents
849 */
850static int find_new_extents(struct btrfs_root *root,
851 struct inode *inode, u64 newer_than,
852 u64 *off, int thresh)
853{
854 struct btrfs_path *path;
855 struct btrfs_key min_key;
4cb5300b
CM		 856 struct extent_buffer *leaf;
857 struct btrfs_file_extent_item *extent;
858 int type;
859 int ret;
a4689d2b 860 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 861
862 path = btrfs_alloc_path();
863 if (!path)
864 return -ENOMEM;
865
a4689d2b 866 min_key.objectid = ino;
4cb5300b
CM		 867 min_key.type = BTRFS_EXTENT_DATA_KEY;
868 min_key.offset = *off;
869
4cb5300b
CM		 870 path->keep_locks = 1;
871
67871254 872 while (1) {
6174d3cb 873 ret = btrfs_search_forward(root, &min_key, path, newer_than);
4cb5300b
CM		 874 if (ret != 0)
875 goto none;
a4689d2b 876 if (min_key.objectid != ino)
4cb5300b
CM		 877 goto none;
878 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
879 goto none;
880
881 leaf = path->nodes[0];
882 extent = btrfs_item_ptr(leaf, path->slots[0],
883 struct btrfs_file_extent_item);
884
885 type = btrfs_file_extent_type(leaf, extent);
886 if (type == BTRFS_FILE_EXTENT_REG &&
887 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
888 check_defrag_in_cache(inode, min_key.offset, thresh)) {
889 *off = min_key.offset;
890 btrfs_free_path(path);
891 return 0;
892 }
893
894 if (min_key.offset == (u64)-1)
895 goto none;
896
897 min_key.offset++;
898 btrfs_release_path(path);
899 }
900none:
901 btrfs_free_path(path);
902 return -ENOENT;
903}
904
6c282eb4 905static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 906{
907 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 908 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
909 struct extent_map *em;
910 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 911
6c282eb4
LZ		 912 /*
913 * hopefully we have this extent in the tree already, try without
914 * the full extent lock
915 */
17ce6ef8 916 read_lock(&em_tree->lock);
6c282eb4 917 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 918 read_unlock(&em_tree->lock);
919
6c282eb4
LZ		 920 if (!em) {
921 /* get the big lock and read metadata off disk */
922 lock_extent(io_tree, start, start + len - 1);
923 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
924 unlock_extent(io_tree, start, start + len - 1);
925
926 if (IS_ERR(em))
927 return NULL;
928 }
929
930 return em;
931}
17ce6ef8 932
6c282eb4
LZ		 933static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
934{
935 struct extent_map *next;
936 bool ret = true;
937
938 /* this is the last extent */
939 if (em->start + em->len >= i_size_read(inode))
940 return false;
941
942 next = defrag_lookup_extent(inode, em->start + em->len);
943 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
944 ret = false;
945
946 free_extent_map(next);
17ce6ef8
LB		 947 return ret;
948}
949
6c282eb4 950static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 951 u64 *last_len, u64 *skip, u64 *defrag_end,
952 int compress)
940100a4 953{
6c282eb4 954 struct extent_map *em;
940100a4 955 int ret = 1;
6c282eb4 956 bool next_mergeable = true;
940100a4
CM		 957
958 /*
008873ea 959 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 960 * defragging it
961 */
962 if (start < *defrag_end)
963 return 1;
964
965 *skip = 0;
966
6c282eb4
LZ		 967 em = defrag_lookup_extent(inode, start);
968 if (!em)
969 return 0;
940100a4
CM		 970
971 /* this will cover holes, and inline extents */
17ce6ef8 972 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 973 ret = 0;
17ce6ef8
LB		 974 goto out;
975 }
976
6c282eb4 977 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 978
979 /*
6c282eb4
LZ		 980 * we hit a real extent, if it is big or the next extent is not a
981 * real extent, don't bother defragging it
940100a4 982 */
a43a2111 983 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 984 (em->len >= thresh || !next_mergeable))
940100a4 985 ret = 0;
17ce6ef8 986out:
940100a4
CM		 987 /*
988 * last_len ends up being a counter of how many bytes we've defragged.
989 * every time we choose not to defrag an extent, we reset *last_len
990 * so that the next tiny extent will force a defrag.
991 *
992 * The end result of this is that tiny extents before a single big
993 * extent will force at least part of that big extent to be defragged.
994 */
995 if (ret) {
940100a4
CM		 996 *defrag_end = extent_map_end(em);
997 } else {
998 *last_len = 0;
999 *skip = extent_map_end(em);
1000 *defrag_end = 0;
1001 }
1002
1003 free_extent_map(em);
1004 return ret;
1005}
1006
4cb5300b
CM		 1007/*
1008 * it doesn't do much good to defrag one or two pages
1009 * at a time. This pulls in a nice chunk of pages
1010 * to COW and defrag.
1011 *
1012 * It also makes sure the delalloc code has enough
1013 * dirty data to avoid making new small extents as part
1014 * of the defrag
1015 *
1016 * It's a good idea to start RA on this range
1017 * before calling this.
1018 */
1019static int cluster_pages_for_defrag(struct inode *inode,
1020 struct page **pages,
1021 unsigned long start_index,
1022 int num_pages)
f46b5a66 1023{
4cb5300b
CM		 1024 unsigned long file_end;
1025 u64 isize = i_size_read(inode);
1026 u64 page_start;
1027 u64 page_end;
1f12bd06 1028 u64 page_cnt;
4cb5300b
CM		 1029 int ret;
1030 int i;
1031 int i_done;
3eaa2885 1032 struct btrfs_ordered_extent *ordered;
4cb5300b 1033 struct extent_state *cached_state = NULL;
600a45e1 1034 struct extent_io_tree *tree;
3b16a4e3 1035 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1036
4cb5300b 1037 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 1038 if (!isize || start_index > file_end)
1039 return 0;
1040
1041 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 1042
1043 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 1044 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1045 if (ret)
1046 return ret;
4cb5300b 1047 i_done = 0;
600a45e1 1048 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1049
1050 /* step one, lock all the pages */
1f12bd06 1051 for (i = 0; i < page_cnt; i++) {
4cb5300b 1052 struct page *page;
600a45e1 1053again:
a94733d0 1054 page = find_or_create_page(inode->i_mapping,
600a45e1 1055 start_index + i, mask);
4cb5300b
CM		 1056 if (!page)
1057 break;
1058
600a45e1
MX		 1059 page_start = page_offset(page);
1060 page_end = page_start + PAGE_CACHE_SIZE - 1;
1061 while (1) {
d0082371 1062 lock_extent(tree, page_start, page_end);
600a45e1
MX		 1063 ordered = btrfs_lookup_ordered_extent(inode,
1064 page_start);
d0082371 1065 unlock_extent(tree, page_start, page_end);
600a45e1
MX		 1066 if (!ordered)
1067 break;
1068
1069 unlock_page(page);
1070 btrfs_start_ordered_extent(inode, ordered, 1);
1071 btrfs_put_ordered_extent(ordered);
1072 lock_page(page);
1f12bd06
LB		 1073 /*
1074 * we unlocked the page above, so we need check if
1075 * it was released or not.
1076 */
1077 if (page->mapping != inode->i_mapping) {
1078 unlock_page(page);
1079 page_cache_release(page);
1080 goto again;
1081 }
600a45e1
MX		 1082 }
1083
4cb5300b
CM		 1084 if (!PageUptodate(page)) {
1085 btrfs_readpage(NULL, page);
1086 lock_page(page);
1087 if (!PageUptodate(page)) {
1088 unlock_page(page);
1089 page_cache_release(page);
1090 ret = -EIO;
1091 break;
1092 }
1093 }
600a45e1 1094
600a45e1
MX		 1095 if (page->mapping != inode->i_mapping) {
1096 unlock_page(page);
1097 page_cache_release(page);
1098 goto again;
1099 }
1100
4cb5300b
CM		 1101 pages[i] = page;
1102 i_done++;
1103 }
1104 if (!i_done || ret)
1105 goto out;
1106
1107 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1108 goto out;
1109
1110 /*
1111 * so now we have a nice long stream of locked
1112 * and up to date pages, lets wait on them
1113 */
1114 for (i = 0; i < i_done; i++)
1115 wait_on_page_writeback(pages[i]);
1116
1117 page_start = page_offset(pages[0]);
1118 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1119
1120 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1121 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1122 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1123 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1124 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1125 &cached_state, GFP_NOFS);
4cb5300b 1126
1f12bd06 1127 if (i_done != page_cnt) {
9e0baf60
JB		 1128 spin_lock(&BTRFS_I(inode)->lock);
1129 BTRFS_I(inode)->outstanding_extents++;
1130 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1131 btrfs_delalloc_release_space(inode,
1f12bd06 1132 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1133 }
1134
1135
9e8a4a8b
LB		 1136 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1137 &cached_state, GFP_NOFS);
4cb5300b
CM		 1138
1139 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1140 page_start, page_end - 1, &cached_state,
1141 GFP_NOFS);
1142
1143 for (i = 0; i < i_done; i++) {
1144 clear_page_dirty_for_io(pages[i]);
1145 ClearPageChecked(pages[i]);
1146 set_page_extent_mapped(pages[i]);
1147 set_page_dirty(pages[i]);
1148 unlock_page(pages[i]);
1149 page_cache_release(pages[i]);
1150 }
1151 return i_done;
1152out:
1153 for (i = 0; i < i_done; i++) {
1154 unlock_page(pages[i]);
1155 page_cache_release(pages[i]);
1156 }
1f12bd06 1157 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1158 return ret;
1159
1160}
1161
1162int btrfs_defrag_file(struct inode *inode, struct file *file,
1163 struct btrfs_ioctl_defrag_range_args *range,
1164 u64 newer_than, unsigned long max_to_defrag)
1165{
1166 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1167 struct file_ra_state *ra = NULL;
f46b5a66 1168 unsigned long last_index;
151a31b2 1169 u64 isize = i_size_read(inode);
940100a4
CM		 1170 u64 last_len = 0;
1171 u64 skip = 0;
1172 u64 defrag_end = 0;
4cb5300b 1173 u64 newer_off = range->start;
f46b5a66 1174 unsigned long i;
008873ea 1175 unsigned long ra_index = 0;
f46b5a66 1176 int ret;
4cb5300b 1177 int defrag_count = 0;
1a419d85 1178 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1179 int extent_thresh = range->extent_thresh;
008873ea
LZ		 1180 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1181 int cluster = max_cluster;
4cb5300b
CM		 1182 u64 new_align = ~((u64)128 * 1024 - 1);
1183 struct page **pages = NULL;
1184
0abd5b17
LB		 1185 if (isize == 0)
1186 return 0;
1187
1188 if (range->start >= isize)
1189 return -EINVAL;
1a419d85
LZ		 1190
1191 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1192 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1193 return -EINVAL;
1194 if (range->compress_type)
1195 compress_type = range->compress_type;
1196 }
f46b5a66 1197
0abd5b17
LB		 1198 if (extent_thresh == 0)
1199 extent_thresh = 256 * 1024;
940100a4 1200
4cb5300b
CM		 1201 /*
1202 * if we were not given a file, allocate a readahead
1203 * context
1204 */
1205 if (!file) {
1206 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1207 if (!ra)
1208 return -ENOMEM;
1209 file_ra_state_init(ra, inode->i_mapping);
1210 } else {
1211 ra = &file->f_ra;
1212 }
1213
d9b0d9ba 1214 pages = kmalloc_array(max_cluster, sizeof(struct page *),
4cb5300b
CM		 1215 GFP_NOFS);
1216 if (!pages) {
1217 ret = -ENOMEM;
1218 goto out_ra;
1219 }
1220
1221 /* find the last page to defrag */
1e701a32 1222 if (range->start + range->len > range->start) {
151a31b2 1223 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1224 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1225 } else {
151a31b2 1226 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1227 }
1228
4cb5300b
CM		 1229 if (newer_than) {
1230 ret = find_new_extents(root, inode, newer_than,
1231 &newer_off, 64 * 1024);
1232 if (!ret) {
1233 range->start = newer_off;
1234 /*
1235 * we always align our defrag to help keep
1236 * the extents in the file evenly spaced
1237 */
1238 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1239 } else
1240 goto out_ra;
1241 } else {
1242 i = range->start >> PAGE_CACHE_SHIFT;
1243 }
1244 if (!max_to_defrag)
7ec31b54 1245 max_to_defrag = last_index + 1;
4cb5300b 1246
2a0f7f57
LZ		 1247 /*
1248 * make writeback starts from i, so the defrag range can be
1249 * written sequentially.
1250 */
1251 if (i < inode->i_mapping->writeback_index)
1252 inode->i_mapping->writeback_index = i;
1253
f7f43cc8
CM		 1254 while (i <= last_index && defrag_count < max_to_defrag &&
1255 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1256 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1257 /*
1258 * make sure we stop running if someone unmounts
1259 * the FS
1260 */
1261 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1262 break;
1263
210549eb 1264 if (btrfs_defrag_cancelled(root->fs_info)) {
efe120a0 1265 printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
210549eb
DS		 1266 ret = -EAGAIN;
1267 break;
1268 }
1269
66c26892 1270 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1271 extent_thresh, &last_len, &skip,
a43a2111
AM		 1272 &defrag_end, range->flags &
1273 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1274 unsigned long next;
1275 /*
1276 * the should_defrag function tells us how much to skip
1277 * bump our counter by the suggested amount
1278 */
1279 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1280 i = max(i + 1, next);
1281 continue;
1282 }
008873ea
LZ		 1283
1284 if (!newer_than) {
1285 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1286 PAGE_CACHE_SHIFT) - i;
1287 cluster = min(cluster, max_cluster);
1288 } else {
1289 cluster = max_cluster;
1290 }
1291
008873ea
LZ		 1292 if (i + cluster > ra_index) {
1293 ra_index = max(i, ra_index);
1294 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1295 cluster);
1296 ra_index += max_cluster;
1297 }
940100a4 1298
ecb8bea8 1299 mutex_lock(&inode->i_mutex);
633085c7
FDBM		 1300 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1301 BTRFS_I(inode)->force_compress = compress_type;
008873ea 1302 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1303 if (ret < 0) {
1304 mutex_unlock(&inode->i_mutex);
4cb5300b 1305 goto out_ra;
ecb8bea8 1306 }
4cb5300b
CM		 1307
1308 defrag_count += ret;
d0e1d66b 1309 balance_dirty_pages_ratelimited(inode->i_mapping);
ecb8bea8 1310 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1311
1312 if (newer_than) {
1313 if (newer_off == (u64)-1)
1314 break;
1315
e1f041e1
LB		 1316 if (ret > 0)
1317 i += ret;
1318
4cb5300b
CM		 1319 newer_off = max(newer_off + 1,
1320 (u64)i << PAGE_CACHE_SHIFT);
1321
1322 ret = find_new_extents(root, inode,
1323 newer_than, &newer_off,
1324 64 * 1024);
1325 if (!ret) {
1326 range->start = newer_off;
1327 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1328 } else {
1329 break;
f46b5a66 1330 }
4cb5300b 1331 } else {
008873ea 1332 if (ret > 0) {
cbcc8326 1333 i += ret;
008873ea
LZ		 1334 last_len += ret << PAGE_CACHE_SHIFT;
1335 } else {
cbcc8326 1336 i++;
008873ea
LZ		 1337 last_len = 0;
1338 }
f46b5a66 1339 }
f46b5a66
CH		 1340 }
1341
1e701a32
CM		 1342 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1343 filemap_flush(inode->i_mapping);
1344
1345 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1346 /* the filemap_flush will queue IO into the worker threads, but
1347 * we have to make sure the IO is actually started and that
1348 * ordered extents get created before we return
1349 */
1350 atomic_inc(&root->fs_info->async_submit_draining);
1351 while (atomic_read(&root->fs_info->nr_async_submits) ||
1352 atomic_read(&root->fs_info->async_delalloc_pages)) {
1353 wait_event(root->fs_info->async_submit_wait,
1354 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1355 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1356 }
1357 atomic_dec(&root->fs_info->async_submit_draining);
1e701a32
CM		 1358 }
1359
1a419d85 1360 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1361 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1362 }
1363
60ccf82f 1364 ret = defrag_count;
940100a4 1365
4cb5300b 1366out_ra:
633085c7
FDBM		 1367 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1368 mutex_lock(&inode->i_mutex);
1369 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1370 mutex_unlock(&inode->i_mutex);
1371 }
4cb5300b
CM		 1372 if (!file)
1373 kfree(ra);
1374 kfree(pages);
940100a4 1375 return ret;
f46b5a66
CH		 1376}
1377
198605a8 1378static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1379 void __user *arg)
f46b5a66
CH		 1380{
1381 u64 new_size;
1382 u64 old_size;
1383 u64 devid = 1;
496ad9aa 1384 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 1385 struct btrfs_ioctl_vol_args *vol_args;
1386 struct btrfs_trans_handle *trans;
1387 struct btrfs_device *device = NULL;
1388 char *sizestr;
1389 char *devstr = NULL;
1390 int ret = 0;
f46b5a66
CH		 1391 int mod = 0;
1392
e441d54d
CM		 1393 if (!capable(CAP_SYS_ADMIN))
1394 return -EPERM;
1395
198605a8
MX		 1396 ret = mnt_want_write_file(file);
1397 if (ret)
1398 return ret;
1399
5ac00add
SB		 1400 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1401 1)) {
97547676 1402 mnt_drop_write_file(file);
e57138b3 1403 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1404 }
1405
5ac00add 1406 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 1407 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1408 if (IS_ERR(vol_args)) {
1409 ret = PTR_ERR(vol_args);
1410 goto out;
1411 }
5516e595
MF		 1412
1413 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1414
f46b5a66
CH		 1415 sizestr = vol_args->name;
1416 devstr = strchr(sizestr, ':');
1417 if (devstr) {
1418 char *end;
1419 sizestr = devstr + 1;
1420 *devstr = '\0';
1421 devstr = vol_args->name;
1422 devid = simple_strtoull(devstr, &end, 10);
dfd79829
MX		 1423 if (!devid) {
1424 ret = -EINVAL;
1425 goto out_free;
1426 }
efe120a0 1427 btrfs_info(root->fs_info, "resizing devid %llu", devid);
f46b5a66 1428 }
dba60f3f 1429
aa1b8cd4 1430 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1431 if (!device) {
efe120a0 1432 btrfs_info(root->fs_info, "resizer unable to find device %llu",
c1c9ff7c 1433 devid);
dfd79829 1434 ret = -ENODEV;
c9e9f97b 1435 goto out_free;
f46b5a66 1436 }
dba60f3f
MX		 1437
1438 if (!device->writeable) {
efe120a0
FH		 1439 btrfs_info(root->fs_info,
1440 "resizer unable to apply on readonly device %llu",
c1c9ff7c 1441 devid);
dfd79829 1442 ret = -EPERM;
4e42ae1b
LB		 1443 goto out_free;
1444 }
1445
f46b5a66
CH		 1446 if (!strcmp(sizestr, "max"))
1447 new_size = device->bdev->bd_inode->i_size;
1448 else {
1449 if (sizestr[0] == '-') {
1450 mod = -1;
1451 sizestr++;
1452 } else if (sizestr[0] == '+') {
1453 mod = 1;
1454 sizestr++;
1455 }
91748467 1456 new_size = memparse(sizestr, NULL);
f46b5a66
CH		 1457 if (new_size == 0) {
1458 ret = -EINVAL;
c9e9f97b 1459 goto out_free;
f46b5a66
CH		 1460 }
1461 }
1462
63a212ab 1463 if (device->is_tgtdev_for_dev_replace) {
dfd79829 1464 ret = -EPERM;
63a212ab
SB		 1465 goto out_free;
1466 }
1467
f46b5a66
CH		 1468 old_size = device->total_bytes;
1469
1470 if (mod < 0) {
1471 if (new_size > old_size) {
1472 ret = -EINVAL;
c9e9f97b 1473 goto out_free;
f46b5a66
CH		 1474 }
1475 new_size = old_size - new_size;
1476 } else if (mod > 0) {
eb8052e0
WF		 1477 if (new_size > ULLONG_MAX - old_size) {
1478 ret = -EINVAL;
1479 goto out_free;
1480 }
f46b5a66
CH		 1481 new_size = old_size + new_size;
1482 }
1483
1484 if (new_size < 256 * 1024 * 1024) {
1485 ret = -EINVAL;
c9e9f97b 1486 goto out_free;
f46b5a66
CH		 1487 }
1488 if (new_size > device->bdev->bd_inode->i_size) {
1489 ret = -EFBIG;
c9e9f97b 1490 goto out_free;
f46b5a66
CH		 1491 }
1492
1493 do_div(new_size, root->sectorsize);
1494 new_size *= root->sectorsize;
1495
efe120a0 1496 printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
c1c9ff7c 1497 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1498
1499 if (new_size > old_size) {
a22285a6 1500 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1501 if (IS_ERR(trans)) {
1502 ret = PTR_ERR(trans);
c9e9f97b 1503 goto out_free;
98d5dc13 1504 }
f46b5a66
CH		 1505 ret = btrfs_grow_device(trans, device, new_size);
1506 btrfs_commit_transaction(trans, root);
ece7d20e 1507 } else if (new_size < old_size) {
f46b5a66 1508 ret = btrfs_shrink_device(device, new_size);
0253f40e 1509 } /* equal, nothing need to do */
f46b5a66 1510
c9e9f97b 1511out_free:
f46b5a66 1512 kfree(vol_args);
c9e9f97b
ID		 1513out:
1514 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 1515 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
18f39c41 1516 mnt_drop_write_file(file);
f46b5a66
CH		 1517 return ret;
1518}
1519
72fd032e 1520static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1521 char *name, unsigned long fd, int subvol,
1522 u64 *transid, bool readonly,
8696c533 1523 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1524{
f46b5a66 1525 int namelen;
3de4586c 1526 int ret = 0;
f46b5a66 1527
a874a63e
LB		 1528 ret = mnt_want_write_file(file);
1529 if (ret)
1530 goto out;
1531
72fd032e
SW		 1532 namelen = strlen(name);
1533 if (strchr(name, '/')) {
f46b5a66 1534 ret = -EINVAL;
a874a63e 1535 goto out_drop_write;
f46b5a66
CH		 1536 }
1537
16780cab
CM		 1538 if (name[0] == '.' &&
1539 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1540 ret = -EEXIST;
a874a63e 1541 goto out_drop_write;
16780cab
CM		 1542 }
1543
3de4586c 1544 if (subvol) {
72fd032e 1545 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1546 NULL, transid, readonly, inherit);
cb8e7090 1547 } else {
2903ff01 1548 struct fd src = fdget(fd);
3de4586c 1549 struct inode *src_inode;
2903ff01 1550 if (!src.file) {
3de4586c 1551 ret = -EINVAL;
a874a63e 1552 goto out_drop_write;
3de4586c
CM		 1553 }
1554
496ad9aa
AV		 1555 src_inode = file_inode(src.file);
1556 if (src_inode->i_sb != file_inode(file)->i_sb) {
efe120a0
FH		 1557 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1558 "Snapshot src from another FS");
3de4586c 1559 ret = -EINVAL;
ecd18815
AV		 1560 } else {
1561 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1562 BTRFS_I(src_inode)->root,
1563 transid, readonly, inherit);
3de4586c 1564 }
2903ff01 1565 fdput(src);
cb8e7090 1566 }
a874a63e
LB		 1567out_drop_write:
1568 mnt_drop_write_file(file);
f46b5a66 1569out:
72fd032e
SW		 1570 return ret;
1571}
1572
1573static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1574 void __user *arg, int subvol)
72fd032e 1575{
fa0d2b9b 1576 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1577 int ret;
1578
fa0d2b9b
LZ		 1579 vol_args = memdup_user(arg, sizeof(*vol_args));
1580 if (IS_ERR(vol_args))
1581 return PTR_ERR(vol_args);
1582 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1583
fa0d2b9b 1584 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1585 vol_args->fd, subvol,
6f72c7e2 1586 NULL, false, NULL);
fdfb1e4f 1587
fa0d2b9b
LZ		 1588 kfree(vol_args);
1589 return ret;
1590}
fdfb1e4f 1591
fa0d2b9b
LZ		 1592static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1593 void __user *arg, int subvol)
1594{
1595 struct btrfs_ioctl_vol_args_v2 *vol_args;
1596 int ret;
1597 u64 transid = 0;
1598 u64 *ptr = NULL;
b83cc969 1599 bool readonly = false;
6f72c7e2 1600 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1601
fa0d2b9b
LZ		 1602 vol_args = memdup_user(arg, sizeof(*vol_args));
1603 if (IS_ERR(vol_args))
1604 return PTR_ERR(vol_args);
1605 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1606
b83cc969 1607 if (vol_args->flags &
6f72c7e2
AJ		 1608 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1609 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1610 ret = -EOPNOTSUPP;
fa0d2b9b 1611 goto out;
72fd032e 1612 }
fa0d2b9b
LZ		 1613
1614 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1615 ptr = &transid;
b83cc969
LZ		 1616 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1617 readonly = true;
6f72c7e2
AJ		 1618 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1619 if (vol_args->size > PAGE_CACHE_SIZE) {
1620 ret = -EINVAL;
1621 goto out;
1622 }
1623 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1624 if (IS_ERR(inherit)) {
1625 ret = PTR_ERR(inherit);
1626 goto out;
1627 }
1628 }
fa0d2b9b
LZ		 1629
1630 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1631 vol_args->fd, subvol, ptr,
8696c533 1632 readonly, inherit);
fa0d2b9b
LZ		 1633
1634 if (ret == 0 && ptr &&
1635 copy_to_user(arg +
1636 offsetof(struct btrfs_ioctl_vol_args_v2,
1637 transid), ptr, sizeof(*ptr)))
1638 ret = -EFAULT;
fdfb1e4f 1639out:
f46b5a66 1640 kfree(vol_args);
6f72c7e2 1641 kfree(inherit);
f46b5a66
CH		 1642 return ret;
1643}
1644
0caa102d
LZ		 1645static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1646 void __user *arg)
1647{
496ad9aa 1648 struct inode *inode = file_inode(file);
0caa102d
LZ		 1649 struct btrfs_root *root = BTRFS_I(inode)->root;
1650 int ret = 0;
1651 u64 flags = 0;
1652
33345d01 1653 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1654 return -EINVAL;
1655
1656 down_read(&root->fs_info->subvol_sem);
1657 if (btrfs_root_readonly(root))
1658 flags |= BTRFS_SUBVOL_RDONLY;
1659 up_read(&root->fs_info->subvol_sem);
1660
1661 if (copy_to_user(arg, &flags, sizeof(flags)))
1662 ret = -EFAULT;
1663
1664 return ret;
1665}
1666
1667static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1668 void __user *arg)
1669{
496ad9aa 1670 struct inode *inode = file_inode(file);
0caa102d
LZ		 1671 struct btrfs_root *root = BTRFS_I(inode)->root;
1672 struct btrfs_trans_handle *trans;
1673 u64 root_flags;
1674 u64 flags;
1675 int ret = 0;
1676
b9ca0664
LB		 1677 ret = mnt_want_write_file(file);
1678 if (ret)
1679 goto out;
0caa102d 1680
b9ca0664
LB		 1681 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1682 ret = -EINVAL;
1683 goto out_drop_write;
1684 }
0caa102d 1685
b9ca0664
LB		 1686 if (copy_from_user(&flags, arg, sizeof(flags))) {
1687 ret = -EFAULT;
1688 goto out_drop_write;
1689 }
0caa102d 1690
b9ca0664
LB		 1691 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1692 ret = -EINVAL;
1693 goto out_drop_write;
1694 }
0caa102d 1695
b9ca0664
LB		 1696 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1697 ret = -EOPNOTSUPP;
1698 goto out_drop_write;
1699 }
0caa102d 1700
b9ca0664
LB		 1701 if (!inode_owner_or_capable(inode)) {
1702 ret = -EACCES;
1703 goto out_drop_write;
1704 }
b4dc2b8c 1705
0caa102d
LZ		 1706 down_write(&root->fs_info->subvol_sem);
1707
1708 /* nothing to do */
1709 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1710 goto out_drop_sem;
0caa102d
LZ		 1711
1712 root_flags = btrfs_root_flags(&root->root_item);
2c686537 1713 if (flags & BTRFS_SUBVOL_RDONLY) {
0caa102d
LZ		 1714 btrfs_set_root_flags(&root->root_item,
1715 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1716 } else {
1717 /*
1718 * Block RO -> RW transition if this subvolume is involved in
1719 * send
1720 */
1721 spin_lock(&root->root_item_lock);
1722 if (root->send_in_progress == 0) {
1723 btrfs_set_root_flags(&root->root_item,
0caa102d 1724 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2c686537
DS		 1725 spin_unlock(&root->root_item_lock);
1726 } else {
1727 spin_unlock(&root->root_item_lock);
1728 btrfs_warn(root->fs_info,
1729 "Attempt to set subvolume %llu read-write during send",
1730 root->root_key.objectid);
1731 ret = -EPERM;
1732 goto out_drop_sem;
1733 }
1734 }
0caa102d
LZ		 1735
1736 trans = btrfs_start_transaction(root, 1);
1737 if (IS_ERR(trans)) {
1738 ret = PTR_ERR(trans);
1739 goto out_reset;
1740 }
1741
b4dc2b8c 1742 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1743 &root->root_key, &root->root_item);
1744
1745 btrfs_commit_transaction(trans, root);
1746out_reset:
1747 if (ret)
1748 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1749out_drop_sem:
0caa102d 1750 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1751out_drop_write:
1752 mnt_drop_write_file(file);
1753out:
0caa102d
LZ		 1754 return ret;
1755}
1756
76dda93c
YZ		 1757/*
1758 * helper to check if the subvolume references other subvolumes
1759 */
1760static noinline int may_destroy_subvol(struct btrfs_root *root)
1761{
1762 struct btrfs_path *path;
175a2b87 1763 struct btrfs_dir_item *di;
76dda93c 1764 struct btrfs_key key;
175a2b87 1765 u64 dir_id;
76dda93c
YZ		 1766 int ret;
1767
1768 path = btrfs_alloc_path();
1769 if (!path)
1770 return -ENOMEM;
1771
175a2b87
JB		 1772 /* Make sure this root isn't set as the default subvol */
1773 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1774 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1775 dir_id, "default", 7, 0);
1776 if (di && !IS_ERR(di)) {
1777 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1778 if (key.objectid == root->root_key.objectid) {
1779 ret = -ENOTEMPTY;
1780 goto out;
1781 }
1782 btrfs_release_path(path);
1783 }
1784
76dda93c
YZ		 1785 key.objectid = root->root_key.objectid;
1786 key.type = BTRFS_ROOT_REF_KEY;
1787 key.offset = (u64)-1;
1788
1789 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1790 &key, path, 0, 0);
1791 if (ret < 0)
1792 goto out;
1793 BUG_ON(ret == 0);
1794
1795 ret = 0;
1796 if (path->slots[0] > 0) {
1797 path->slots[0]--;
1798 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1799 if (key.objectid == root->root_key.objectid &&
1800 key.type == BTRFS_ROOT_REF_KEY)
1801 ret = -ENOTEMPTY;
1802 }
1803out:
1804 btrfs_free_path(path);
1805 return ret;
1806}
1807
ac8e9819
CM		 1808static noinline int key_in_sk(struct btrfs_key *key,
1809 struct btrfs_ioctl_search_key *sk)
1810{
abc6e134
CM		 1811 struct btrfs_key test;
1812 int ret;
1813
1814 test.objectid = sk->min_objectid;
1815 test.type = sk->min_type;
1816 test.offset = sk->min_offset;
1817
1818 ret = btrfs_comp_cpu_keys(key, &test);
1819 if (ret < 0)
ac8e9819 1820 return 0;
abc6e134
CM		 1821
1822 test.objectid = sk->max_objectid;
1823 test.type = sk->max_type;
1824 test.offset = sk->max_offset;
1825
1826 ret = btrfs_comp_cpu_keys(key, &test);
1827 if (ret > 0)
ac8e9819
CM		 1828 return 0;
1829 return 1;
1830}
1831
1832static noinline int copy_to_sk(struct btrfs_root *root,
1833 struct btrfs_path *path,
1834 struct btrfs_key *key,
1835 struct btrfs_ioctl_search_key *sk,
1836 char *buf,
1837 unsigned long *sk_offset,
1838 int *num_found)
1839{
1840 u64 found_transid;
1841 struct extent_buffer *leaf;
1842 struct btrfs_ioctl_search_header sh;
1843 unsigned long item_off;
1844 unsigned long item_len;
1845 int nritems;
1846 int i;
1847 int slot;
ac8e9819
CM		 1848 int ret = 0;
1849
1850 leaf = path->nodes[0];
1851 slot = path->slots[0];
1852 nritems = btrfs_header_nritems(leaf);
1853
1854 if (btrfs_header_generation(leaf) > sk->max_transid) {
1855 i = nritems;
1856 goto advance_key;
1857 }
1858 found_transid = btrfs_header_generation(leaf);
1859
1860 for (i = slot; i < nritems; i++) {
1861 item_off = btrfs_item_ptr_offset(leaf, i);
1862 item_len = btrfs_item_size_nr(leaf, i);
1863
03b71c6c
GP		 1864 btrfs_item_key_to_cpu(leaf, key, i);
1865 if (!key_in_sk(key, sk))
1866 continue;
1867
1868 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
ac8e9819
CM		 1869 item_len = 0;
1870
1871 if (sizeof(sh) + item_len + *sk_offset >
1872 BTRFS_SEARCH_ARGS_BUFSIZE) {
1873 ret = 1;
1874 goto overflow;
1875 }
1876
ac8e9819
CM		 1877 sh.objectid = key->objectid;
1878 sh.offset = key->offset;
1879 sh.type = key->type;
1880 sh.len = item_len;
1881 sh.transid = found_transid;
1882
1883 /* copy search result header */
1884 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1885 *sk_offset += sizeof(sh);
1886
1887 if (item_len) {
1888 char *p = buf + *sk_offset;
1889 /* copy the item */
1890 read_extent_buffer(leaf, p,
1891 item_off, item_len);
1892 *sk_offset += item_len;
ac8e9819 1893 }
e2156867 1894 (*num_found)++;
ac8e9819
CM		 1895
1896 if (*num_found >= sk->nr_items)
1897 break;
1898 }
1899advance_key:
abc6e134
CM		 1900 ret = 0;
1901 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1902 key->offset++;
abc6e134
CM		 1903 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1904 key->offset = 0;
ac8e9819 1905 key->type++;
abc6e134
CM		 1906 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1907 key->offset = 0;
1908 key->type = 0;
ac8e9819 1909 key->objectid++;
abc6e134
CM		 1910 } else
1911 ret = 1;
ac8e9819 1912overflow:
ac8e9819
CM		 1913 return ret;
1914}
1915
1916static noinline int search_ioctl(struct inode *inode,
1917 struct btrfs_ioctl_search_args *args)
1918{
1919 struct btrfs_root *root;
1920 struct btrfs_key key;
ac8e9819
CM		 1921 struct btrfs_path *path;
1922 struct btrfs_ioctl_search_key *sk = &args->key;
1923 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1924 int ret;
1925 int num_found = 0;
1926 unsigned long sk_offset = 0;
1927
1928 path = btrfs_alloc_path();
1929 if (!path)
1930 return -ENOMEM;
1931
1932 if (sk->tree_id == 0) {
1933 /* search the root of the inode that was passed */
1934 root = BTRFS_I(inode)->root;
1935 } else {
1936 key.objectid = sk->tree_id;
1937 key.type = BTRFS_ROOT_ITEM_KEY;
1938 key.offset = (u64)-1;
1939 root = btrfs_read_fs_root_no_name(info, &key);
1940 if (IS_ERR(root)) {
efe120a0 1941 printk(KERN_ERR "BTRFS: could not find root %llu\n",
ac8e9819
CM		 1942 sk->tree_id);
1943 btrfs_free_path(path);
1944 return -ENOENT;
1945 }
1946 }
1947
1948 key.objectid = sk->min_objectid;
1949 key.type = sk->min_type;
1950 key.offset = sk->min_offset;
1951
ac8e9819
CM		 1952 path->keep_locks = 1;
1953
67871254 1954 while (1) {
6174d3cb 1955 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
ac8e9819
CM		 1956 if (ret != 0) {
1957 if (ret > 0)
1958 ret = 0;
1959 goto err;
1960 }
1961 ret = copy_to_sk(root, path, &key, sk, args->buf,
1962 &sk_offset, &num_found);
b3b4aa74 1963 btrfs_release_path(path);
ac8e9819
CM		 1964 if (ret || num_found >= sk->nr_items)
1965 break;
1966
1967 }
1968 ret = 0;
1969err:
1970 sk->nr_items = num_found;
1971 btrfs_free_path(path);
1972 return ret;
1973}
1974
1975static noinline int btrfs_ioctl_tree_search(struct file *file,
1976 void __user *argp)
1977{
1978 struct btrfs_ioctl_search_args *args;
1979 struct inode *inode;
1980 int ret;
1981
1982 if (!capable(CAP_SYS_ADMIN))
1983 return -EPERM;
1984
2354d08f
JL		 1985 args = memdup_user(argp, sizeof(*args));
1986 if (IS_ERR(args))
1987 return PTR_ERR(args);
ac8e9819 1988
496ad9aa 1989 inode = file_inode(file);
ac8e9819
CM		 1990 ret = search_ioctl(inode, args);
1991 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1992 ret = -EFAULT;
1993 kfree(args);
1994 return ret;
1995}
1996
98d377a0 1997/*
ac8e9819
CM		 1998 * Search INODE_REFs to identify path name of 'dirid' directory
1999 * in a 'tree_id' tree. and sets path name to 'name'.
2000 */
98d377a0
TH		 2001static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2002 u64 tree_id, u64 dirid, char *name)
2003{
2004 struct btrfs_root *root;
2005 struct btrfs_key key;
ac8e9819 2006 char *ptr;
98d377a0
TH		 2007 int ret = -1;
2008 int slot;
2009 int len;
2010 int total_len = 0;
2011 struct btrfs_inode_ref *iref;
2012 struct extent_buffer *l;
2013 struct btrfs_path *path;
2014
2015 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2016 name[0]='\0';
2017 return 0;
2018 }
2019
2020 path = btrfs_alloc_path();
2021 if (!path)
2022 return -ENOMEM;
2023
ac8e9819 2024 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 2025
2026 key.objectid = tree_id;
2027 key.type = BTRFS_ROOT_ITEM_KEY;
2028 key.offset = (u64)-1;
2029 root = btrfs_read_fs_root_no_name(info, &key);
2030 if (IS_ERR(root)) {
efe120a0 2031 printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
8ad6fcab
CM		 2032 ret = -ENOENT;
2033 goto out;
98d377a0
TH		 2034 }
2035
2036 key.objectid = dirid;
2037 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2038 key.offset = (u64)-1;
98d377a0 2039
67871254 2040 while (1) {
98d377a0
TH		 2041 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2042 if (ret < 0)
2043 goto out;
18674c6c
FDBM		 2044 else if (ret > 0) {
2045 ret = btrfs_previous_item(root, path, dirid,
2046 BTRFS_INODE_REF_KEY);
2047 if (ret < 0)
2048 goto out;
2049 else if (ret > 0) {
2050 ret = -ENOENT;
2051 goto out;
2052 }
2053 }
98d377a0
TH		 2054
2055 l = path->nodes[0];
2056 slot = path->slots[0];
2057 btrfs_item_key_to_cpu(l, &key, slot);
2058
98d377a0
TH		 2059 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2060 len = btrfs_inode_ref_name_len(l, iref);
2061 ptr -= len + 1;
2062 total_len += len + 1;
a696cf35
FDBM		 2063 if (ptr < name) {
2064 ret = -ENAMETOOLONG;
98d377a0 2065 goto out;
a696cf35 2066 }
98d377a0
TH		 2067
2068 *(ptr + len) = '/';
67871254 2069 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
98d377a0
TH		 2070
2071 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2072 break;
2073
b3b4aa74 2074 btrfs_release_path(path);
98d377a0 2075 key.objectid = key.offset;
8ad6fcab 2076 key.offset = (u64)-1;
98d377a0 2077 dirid = key.objectid;
98d377a0 2078 }
77906a50 2079 memmove(name, ptr, total_len);
67871254 2080 name[total_len] = '\0';
98d377a0
TH		 2081 ret = 0;
2082out:
2083 btrfs_free_path(path);
ac8e9819
CM		 2084 return ret;
2085}
2086
2087static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2088 void __user *argp)
2089{
2090 struct btrfs_ioctl_ino_lookup_args *args;
2091 struct inode *inode;
2092 int ret;
2093
2094 if (!capable(CAP_SYS_ADMIN))
2095 return -EPERM;
2096
2354d08f
JL		 2097 args = memdup_user(argp, sizeof(*args));
2098 if (IS_ERR(args))
2099 return PTR_ERR(args);
c2b96929 2100
496ad9aa 2101 inode = file_inode(file);
ac8e9819 2102
1b53ac4d
CM		 2103 if (args->treeid == 0)
2104 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2105
ac8e9819
CM		 2106 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2107 args->treeid, args->objectid,
2108 args->name);
2109
2110 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2111 ret = -EFAULT;
2112
2113 kfree(args);
98d377a0
TH		 2114 return ret;
2115}
2116
76dda93c
YZ		 2117static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2118 void __user *arg)
2119{
54563d41 2120 struct dentry *parent = file->f_path.dentry;
76dda93c
YZ		 2121 struct dentry *dentry;
2122 struct inode *dir = parent->d_inode;
2123 struct inode *inode;
2124 struct btrfs_root *root = BTRFS_I(dir)->root;
2125 struct btrfs_root *dest = NULL;
2126 struct btrfs_ioctl_vol_args *vol_args;
2127 struct btrfs_trans_handle *trans;
c58aaad2
MX		 2128 struct btrfs_block_rsv block_rsv;
2129 u64 qgroup_reserved;
76dda93c
YZ		 2130 int namelen;
2131 int ret;
2132 int err = 0;
2133
76dda93c
YZ		 2134 vol_args = memdup_user(arg, sizeof(*vol_args));
2135 if (IS_ERR(vol_args))
2136 return PTR_ERR(vol_args);
2137
2138 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2139 namelen = strlen(vol_args->name);
2140 if (strchr(vol_args->name, '/') ||
2141 strncmp(vol_args->name, "..", namelen) == 0) {
2142 err = -EINVAL;
2143 goto out;
2144 }
2145
a561be71 2146 err = mnt_want_write_file(file);
76dda93c
YZ		 2147 if (err)
2148 goto out;
2149
5c50c9b8
DS		 2150 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2151 if (err == -EINTR)
e43f998e 2152 goto out_drop_write;
76dda93c
YZ		 2153 dentry = lookup_one_len(vol_args->name, parent, namelen);
2154 if (IS_ERR(dentry)) {
2155 err = PTR_ERR(dentry);
2156 goto out_unlock_dir;
2157 }
2158
2159 if (!dentry->d_inode) {
2160 err = -ENOENT;
2161 goto out_dput;
2162 }
2163
2164 inode = dentry->d_inode;
4260f7c7 2165 dest = BTRFS_I(inode)->root;
67871254 2166 if (!capable(CAP_SYS_ADMIN)) {
4260f7c7
SW		 2167 /*
2168 * Regular user. Only allow this with a special mount
2169 * option, when the user has write+exec access to the
2170 * subvol root, and when rmdir(2) would have been
2171 * allowed.
2172 *
2173 * Note that this is _not_ check that the subvol is
2174 * empty or doesn't contain data that we wouldn't
2175 * otherwise be able to delete.
2176 *
2177 * Users who want to delete empty subvols should try
2178 * rmdir(2).
2179 */
2180 err = -EPERM;
2181 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2182 goto out_dput;
2183
2184 /*
2185 * Do not allow deletion if the parent dir is the same
2186 * as the dir to be deleted. That means the ioctl
2187 * must be called on the dentry referencing the root
2188 * of the subvol, not a random directory contained
2189 * within it.
2190 */
2191 err = -EINVAL;
2192 if (root == dest)
2193 goto out_dput;
2194
2195 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2196 if (err)
2197 goto out_dput;
4260f7c7
SW		 2198 }
2199
5c39da5b
MX		 2200 /* check if subvolume may be deleted by a user */
2201 err = btrfs_may_delete(dir, dentry, 1);
2202 if (err)
2203 goto out_dput;
2204
33345d01 2205 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2206 err = -EINVAL;
2207 goto out_dput;
2208 }
2209
76dda93c
YZ		 2210 mutex_lock(&inode->i_mutex);
2211 err = d_invalidate(dentry);
2212 if (err)
2213 goto out_unlock;
2214
2215 down_write(&root->fs_info->subvol_sem);
2216
2217 err = may_destroy_subvol(dest);
2218 if (err)
2219 goto out_up_write;
2220
c58aaad2
MX		 2221 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2222 /*
2223 * One for dir inode, two for dir entries, two for root
2224 * ref/backref.
2225 */
2226 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
ee3441b4 2227 5, &qgroup_reserved, true);
c58aaad2
MX		 2228 if (err)
2229 goto out_up_write;
2230
a22285a6
YZ		 2231 trans = btrfs_start_transaction(root, 0);
2232 if (IS_ERR(trans)) {
2233 err = PTR_ERR(trans);
c58aaad2 2234 goto out_release;
a22285a6 2235 }
c58aaad2
MX		 2236 trans->block_rsv = &block_rsv;
2237 trans->bytes_reserved = block_rsv.size;
a22285a6 2238
76dda93c
YZ		 2239 ret = btrfs_unlink_subvol(trans, root, dir,
2240 dest->root_key.objectid,
2241 dentry->d_name.name,
2242 dentry->d_name.len);
79787eaa
JM		 2243 if (ret) {
2244 err = ret;
2245 btrfs_abort_transaction(trans, root, ret);
2246 goto out_end_trans;
2247 }
76dda93c
YZ		 2248
2249 btrfs_record_root_in_trans(trans, dest);
2250
2251 memset(&dest->root_item.drop_progress, 0,
2252 sizeof(dest->root_item.drop_progress));
2253 dest->root_item.drop_level = 0;
2254 btrfs_set_root_refs(&dest->root_item, 0);
2255
d68fc57b
YZ		 2256 if (!xchg(&dest->orphan_item_inserted, 1)) {
2257 ret = btrfs_insert_orphan_item(trans,
2258 root->fs_info->tree_root,
2259 dest->root_key.objectid);
79787eaa
JM		 2260 if (ret) {
2261 btrfs_abort_transaction(trans, root, ret);
2262 err = ret;
2263 goto out_end_trans;
2264 }
d68fc57b 2265 }
dd5f9615
SB		 2266
2267 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2268 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2269 dest->root_key.objectid);
2270 if (ret && ret != -ENOENT) {
2271 btrfs_abort_transaction(trans, root, ret);
2272 err = ret;
2273 goto out_end_trans;
2274 }
2275 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2276 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2277 dest->root_item.received_uuid,
2278 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2279 dest->root_key.objectid);
2280 if (ret && ret != -ENOENT) {
2281 btrfs_abort_transaction(trans, root, ret);
2282 err = ret;
2283 goto out_end_trans;
2284 }
2285 }
2286
79787eaa 2287out_end_trans:
c58aaad2
MX		 2288 trans->block_rsv = NULL;
2289 trans->bytes_reserved = 0;
531cb13f 2290 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2291 if (ret && !err)
2292 err = ret;
76dda93c 2293 inode->i_flags |= S_DEAD;
c58aaad2
MX		 2294out_release:
2295 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
76dda93c
YZ		 2296out_up_write:
2297 up_write(&root->fs_info->subvol_sem);
2298out_unlock:
2299 mutex_unlock(&inode->i_mutex);
2300 if (!err) {
efefb143 2301 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2302 btrfs_invalidate_inodes(dest);
2303 d_delete(dentry);
fa6ac876
LB		 2304
2305 /* the last ref */
2306 if (dest->cache_inode) {
2307 iput(dest->cache_inode);
2308 dest->cache_inode = NULL;
2309 }
76dda93c
YZ		 2310 }
2311out_dput:
2312 dput(dentry);
2313out_unlock_dir:
2314 mutex_unlock(&dir->i_mutex);
e43f998e 2315out_drop_write:
2a79f17e 2316 mnt_drop_write_file(file);
76dda93c
YZ		 2317out:
2318 kfree(vol_args);
2319 return err;
2320}
2321
1e701a32 2322static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2323{
496ad9aa 2324 struct inode *inode = file_inode(file);
f46b5a66 2325 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2326 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2327 int ret;
2328
25122d15
ID		 2329 ret = mnt_want_write_file(file);
2330 if (ret)
2331 return ret;
b83cc969 2332
25122d15
ID		 2333 if (btrfs_root_readonly(root)) {
2334 ret = -EROFS;
2335 goto out;
5ac00add 2336 }
f46b5a66
CH		 2337
2338 switch (inode->i_mode & S_IFMT) {
2339 case S_IFDIR:
e441d54d
CM		 2340 if (!capable(CAP_SYS_ADMIN)) {
2341 ret = -EPERM;
2342 goto out;
2343 }
de78b51a 2344 ret = btrfs_defrag_root(root);
8929ecfa
YZ		 2345 if (ret)
2346 goto out;
de78b51a 2347 ret = btrfs_defrag_root(root->fs_info->extent_root);
f46b5a66
CH		 2348 break;
2349 case S_IFREG:
e441d54d
CM		 2350 if (!(file->f_mode & FMODE_WRITE)) {
2351 ret = -EINVAL;
2352 goto out;
2353 }
1e701a32
CM		 2354
2355 range = kzalloc(sizeof(*range), GFP_KERNEL);
2356 if (!range) {
2357 ret = -ENOMEM;
2358 goto out;
2359 }
2360
2361 if (argp) {
2362 if (copy_from_user(range, argp,
2363 sizeof(*range))) {
2364 ret = -EFAULT;
2365 kfree(range);
683be16e 2366 goto out;
1e701a32
CM		 2367 }
2368 /* compression requires us to start the IO */
2369 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2370 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2371 range->extent_thresh = (u32)-1;
2372 }
2373 } else {
2374 /* the rest are all set to zero by kzalloc */
2375 range->len = (u64)-1;
2376 }
496ad9aa 2377 ret = btrfs_defrag_file(file_inode(file), file,
4cb5300b
CM		 2378 range, 0, 0);
2379 if (ret > 0)
2380 ret = 0;
1e701a32 2381 kfree(range);
f46b5a66 2382 break;
8929ecfa
YZ		 2383 default:
2384 ret = -EINVAL;
f46b5a66 2385 }
e441d54d 2386out:
25122d15 2387 mnt_drop_write_file(file);
e441d54d 2388 return ret;
f46b5a66
CH		 2389}
2390
b2950863 2391static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2392{
2393 struct btrfs_ioctl_vol_args *vol_args;
2394 int ret;
2395
e441d54d
CM		 2396 if (!capable(CAP_SYS_ADMIN))
2397 return -EPERM;
2398
5ac00add
SB		 2399 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2400 1)) {
e57138b3 2401 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 2402 }
2403
5ac00add 2404 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2405 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2406 if (IS_ERR(vol_args)) {
2407 ret = PTR_ERR(vol_args);
2408 goto out;
2409 }
f46b5a66 2410
5516e595 2411 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2412 ret = btrfs_init_new_device(root, vol_args->name);
2413
f46b5a66 2414 kfree(vol_args);
c9e9f97b
ID		 2415out:
2416 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2417 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
f46b5a66
CH		 2418 return ret;
2419}
2420
da24927b 2421static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 2422{
496ad9aa 2423 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 2424 struct btrfs_ioctl_vol_args *vol_args;
2425 int ret;
2426
e441d54d
CM		 2427 if (!capable(CAP_SYS_ADMIN))
2428 return -EPERM;
2429
da24927b
MX		 2430 ret = mnt_want_write_file(file);
2431 if (ret)
2432 return ret;
c146afad 2433
dae7b665 2434 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2435 if (IS_ERR(vol_args)) {
2436 ret = PTR_ERR(vol_args);
2437 goto out;
2438 }
f46b5a66 2439
5516e595 2440 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 2441
183860f6
AJ		 2442 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2443 1)) {
2444 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2445 goto out;
2446 }
2447
2448 mutex_lock(&root->fs_info->volume_mutex);
2449 ret = btrfs_rm_device(root, vol_args->name);
c9e9f97b 2450 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2451 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
183860f6
AJ		 2452
2453out:
2454 kfree(vol_args);
4ac20c70 2455 mnt_drop_write_file(file);
f46b5a66
CH		 2456 return ret;
2457}
2458
475f6387
JS		 2459static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2460{
027ed2f0 2461 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2462 struct btrfs_device *device;
2463 struct btrfs_device *next;
2464 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2465 int ret = 0;
475f6387
JS		 2466
2467 if (!capable(CAP_SYS_ADMIN))
2468 return -EPERM;
2469
027ed2f0
LZ		 2470 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2471 if (!fi_args)
2472 return -ENOMEM;
2473
f7171750 2474 mutex_lock(&fs_devices->device_list_mutex);
027ed2f0
LZ		 2475 fi_args->num_devices = fs_devices->num_devices;
2476 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387 2477
475f6387 2478 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2479 if (device->devid > fi_args->max_id)
2480 fi_args->max_id = device->devid;
475f6387
JS		 2481 }
2482 mutex_unlock(&fs_devices->device_list_mutex);
2483
027ed2f0
LZ		 2484 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2485 ret = -EFAULT;
475f6387 2486
027ed2f0
LZ		 2487 kfree(fi_args);
2488 return ret;
475f6387
JS		 2489}
2490
2491static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2492{
2493 struct btrfs_ioctl_dev_info_args *di_args;
2494 struct btrfs_device *dev;
2495 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2496 int ret = 0;
2497 char *s_uuid = NULL;
475f6387
JS		 2498
2499 if (!capable(CAP_SYS_ADMIN))
2500 return -EPERM;
2501
2502 di_args = memdup_user(arg, sizeof(*di_args));
2503 if (IS_ERR(di_args))
2504 return PTR_ERR(di_args);
2505
dd5f9615 2506 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 2507 s_uuid = di_args->uuid;
2508
2509 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2510 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2511
2512 if (!dev) {
2513 ret = -ENODEV;
2514 goto out;
2515 }
2516
2517 di_args->devid = dev->devid;
2518 di_args->bytes_used = dev->bytes_used;
2519 di_args->total_bytes = dev->total_bytes;
2520 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2521 if (dev->name) {
606686ee
JB		 2522 struct rcu_string *name;
2523
2524 rcu_read_lock();
2525 name = rcu_dereference(dev->name);
2526 strncpy(di_args->path, name->str, sizeof(di_args->path));
2527 rcu_read_unlock();
a27202fb
JM		 2528 di_args->path[sizeof(di_args->path) - 1] = 0;
2529 } else {
99ba55ad 2530 di_args->path[0] = '\0';
a27202fb 2531 }
475f6387
JS		 2532
2533out:
55793c0d 2534 mutex_unlock(&fs_devices->device_list_mutex);
475f6387
JS		 2535 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2536 ret = -EFAULT;
2537
2538 kfree(di_args);
2539 return ret;
2540}
2541
416161db
MF		 2542static struct page *extent_same_get_page(struct inode *inode, u64 off)
2543{
2544 struct page *page;
2545 pgoff_t index;
2546 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2547
2548 index = off >> PAGE_CACHE_SHIFT;
2549
2550 page = grab_cache_page(inode->i_mapping, index);
2551 if (!page)
2552 return NULL;
2553
2554 if (!PageUptodate(page)) {
2555 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2556 0))
2557 return NULL;
2558 lock_page(page);
2559 if (!PageUptodate(page)) {
2560 unlock_page(page);
2561 page_cache_release(page);
2562 return NULL;
2563 }
2564 }
2565 unlock_page(page);
2566
2567 return page;
2568}
2569
77fe20dc
MF		 2570static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2571{
2572 /* do any pending delalloc/csum calc on src, one way or
2573 another, and lock file content */
2574 while (1) {
2575 struct btrfs_ordered_extent *ordered;
2576 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2577 ordered = btrfs_lookup_first_ordered_extent(inode,
2578 off + len - 1);
2579 if (!ordered &&
2580 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2581 off + len - 1, EXTENT_DELALLOC, 0, NULL))
2582 break;
2583 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2584 if (ordered)
2585 btrfs_put_ordered_extent(ordered);
2586 btrfs_wait_ordered_range(inode, off, len);
2587 }
2588}
2589
416161db
MF		 2590static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2591 struct inode *inode2, u64 loff2, u64 len)
2592{
2593 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2594 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2595
2596 mutex_unlock(&inode1->i_mutex);
2597 mutex_unlock(&inode2->i_mutex);
2598}
2599
2600static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2601 struct inode *inode2, u64 loff2, u64 len)
2602{
2603 if (inode1 < inode2) {
2604 swap(inode1, inode2);
2605 swap(loff1, loff2);
2606 }
2607
2608 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2609 lock_extent_range(inode1, loff1, len);
2610 if (inode1 != inode2) {
2611 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2612 lock_extent_range(inode2, loff2, len);
2613 }
2614}
2615
2616static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2617 u64 dst_loff, u64 len)
2618{
2619 int ret = 0;
2620 struct page *src_page, *dst_page;
2621 unsigned int cmp_len = PAGE_CACHE_SIZE;
2622 void *addr, *dst_addr;
2623
2624 while (len) {
2625 if (len < PAGE_CACHE_SIZE)
2626 cmp_len = len;
2627
2628 src_page = extent_same_get_page(src, loff);
2629 if (!src_page)
2630 return -EINVAL;
2631 dst_page = extent_same_get_page(dst, dst_loff);
2632 if (!dst_page) {
2633 page_cache_release(src_page);
2634 return -EINVAL;
2635 }
2636 addr = kmap_atomic(src_page);
2637 dst_addr = kmap_atomic(dst_page);
2638
2639 flush_dcache_page(src_page);
2640 flush_dcache_page(dst_page);
2641
2642 if (memcmp(addr, dst_addr, cmp_len))
2643 ret = BTRFS_SAME_DATA_DIFFERS;
2644
2645 kunmap_atomic(addr);
2646 kunmap_atomic(dst_addr);
2647 page_cache_release(src_page);
2648 page_cache_release(dst_page);
2649
2650 if (ret)
2651 break;
2652
2653 loff += cmp_len;
2654 dst_loff += cmp_len;
2655 len -= cmp_len;
2656 }
2657
2658 return ret;
2659}
2660
2661static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2662{
2663 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2664
2665 if (off + len > inode->i_size || off + len < off)
2666 return -EINVAL;
2667 /* Check that we are block aligned - btrfs_clone() requires this */
2668 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2669 return -EINVAL;
2670
2671 return 0;
2672}
2673
2674static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2675 struct inode *dst, u64 dst_loff)
2676{
2677 int ret;
2678
2679 /*
2680 * btrfs_clone() can't handle extents in the same file
2681 * yet. Once that works, we can drop this check and replace it
2682 * with a check for the same inode, but overlapping extents.
2683 */
2684 if (src == dst)
2685 return -EINVAL;
2686
2687 btrfs_double_lock(src, loff, dst, dst_loff, len);
2688
2689 ret = extent_same_check_offsets(src, loff, len);
2690 if (ret)
2691 goto out_unlock;
2692
2693 ret = extent_same_check_offsets(dst, dst_loff, len);
2694 if (ret)
2695 goto out_unlock;
2696
2697 /* don't make the dst file partly checksummed */
2698 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2699 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2700 ret = -EINVAL;
2701 goto out_unlock;
2702 }
2703
2704 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2705 if (ret == 0)
2706 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2707
2708out_unlock:
2709 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2710
2711 return ret;
2712}
2713
2714#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2715
2716static long btrfs_ioctl_file_extent_same(struct file *file,
2717 void __user *argp)
2718{
cbf8b8ca
MF		 2719 struct btrfs_ioctl_same_args tmp;
2720 struct btrfs_ioctl_same_args *same;
2721 struct btrfs_ioctl_same_extent_info *info;
416161db
MF		 2722 struct inode *src = file->f_dentry->d_inode;
2723 struct file *dst_file = NULL;
2724 struct inode *dst;
2725 u64 off;
2726 u64 len;
2727 int i;
2728 int ret;
cbf8b8ca 2729 unsigned long size;
416161db
MF		 2730 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2731 bool is_admin = capable(CAP_SYS_ADMIN);
2732
2733 if (!(file->f_mode & FMODE_READ))
2734 return -EINVAL;
2735
2736 ret = mnt_want_write_file(file);
2737 if (ret)
2738 return ret;
2739
cbf8b8ca 2740 if (copy_from_user(&tmp,
416161db 2741 (struct btrfs_ioctl_same_args __user *)argp,
cbf8b8ca 2742 sizeof(tmp))) {
416161db
MF		 2743 ret = -EFAULT;
2744 goto out;
2745 }
2746
cbf8b8ca
MF		 2747 size = sizeof(tmp) +
2748 tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);
2749
229eed43 2750 same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);
cbf8b8ca 2751
229eed43
GB		 2752 if (IS_ERR(same)) {
2753 ret = PTR_ERR(same);
cbf8b8ca
MF		 2754 goto out;
2755 }
2756
2757 off = same->logical_offset;
2758 len = same->length;
416161db
MF		 2759
2760 /*
2761 * Limit the total length we will dedupe for each operation.
2762 * This is intended to bound the total time spent in this
2763 * ioctl to something sane.
2764 */
2765 if (len > BTRFS_MAX_DEDUPE_LEN)
2766 len = BTRFS_MAX_DEDUPE_LEN;
2767
2768 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2769 /*
2770 * Btrfs does not support blocksize < page_size. As a
2771 * result, btrfs_cmp_data() won't correctly handle
2772 * this situation without an update.
2773 */
2774 ret = -EINVAL;
2775 goto out;
2776 }
2777
2778 ret = -EISDIR;
2779 if (S_ISDIR(src->i_mode))
2780 goto out;
2781
2782 ret = -EACCES;
2783 if (!S_ISREG(src->i_mode))
2784 goto out;
2785
cbf8b8ca
MF		 2786 /* pre-format output fields to sane values */
2787 for (i = 0; i < same->dest_count; i++) {
2788 same->info[i].bytes_deduped = 0ULL;
2789 same->info[i].status = 0;
2790 }
416161db 2791
cbf8b8ca
MF		 2792 ret = 0;
2793 for (i = 0; i < same->dest_count; i++) {
2794 info = &same->info[i];
416161db 2795
cbf8b8ca 2796 dst_file = fget(info->fd);
416161db 2797 if (!dst_file) {
cbf8b8ca 2798 info->status = -EBADF;
416161db
MF		 2799 goto next;
2800 }
2801
2802 if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
cbf8b8ca 2803 info->status = -EINVAL;
416161db
MF		 2804 goto next;
2805 }
2806
cbf8b8ca 2807 info->status = -EXDEV;
416161db
MF		 2808 if (file->f_path.mnt != dst_file->f_path.mnt)
2809 goto next;
2810
2811 dst = dst_file->f_dentry->d_inode;
2812 if (src->i_sb != dst->i_sb)
2813 goto next;
2814
2815 if (S_ISDIR(dst->i_mode)) {
cbf8b8ca 2816 info->status = -EISDIR;
416161db
MF		 2817 goto next;
2818 }
2819
2820 if (!S_ISREG(dst->i_mode)) {
cbf8b8ca 2821 info->status = -EACCES;
416161db
MF		 2822 goto next;
2823 }
2824
cbf8b8ca
MF		 2825 info->status = btrfs_extent_same(src, off, len, dst,
2826 info->logical_offset);
2827 if (info->status == 0)
2828 info->bytes_deduped += len;
416161db
MF		 2829
2830next:
2831 if (dst_file)
2832 fput(dst_file);
416161db
MF		 2833 }
2834
cbf8b8ca
MF		 2835 ret = copy_to_user(argp, same, size);
2836 if (ret)
2837 ret = -EFAULT;
2838
416161db
MF		 2839out:
2840 mnt_drop_write_file(file);
2841 return ret;
2842}
2843
32b7c687
MF		 2844/**
2845 * btrfs_clone() - clone a range from inode file to another
2846 *
2847 * @src: Inode to clone from
2848 * @inode: Inode to clone to
2849 * @off: Offset within source to start clone from
2850 * @olen: Original length, passed by user, of range to clone
2851 * @olen_aligned: Block-aligned value of olen, extent_same uses
2852 * identical values here
2853 * @destoff: Offset within @inode to start clone
2854 */
2855static int btrfs_clone(struct inode *src, struct inode *inode,
2856 u64 off, u64 olen, u64 olen_aligned, u64 destoff)
f46b5a66 2857{
f46b5a66 2858 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 2859 struct btrfs_path *path = NULL;
f46b5a66 2860 struct extent_buffer *leaf;
32b7c687
MF		 2861 struct btrfs_trans_handle *trans;
2862 char *buf = NULL;
ae01a0ab 2863 struct btrfs_key key;
f46b5a66
CH		 2864 u32 nritems;
2865 int slot;
ae01a0ab 2866 int ret;
32b7c687 2867 u64 len = olen_aligned;
ae01a0ab
YZ		 2868
2869 ret = -ENOMEM;
2870 buf = vmalloc(btrfs_level_size(root, 0));
2871 if (!buf)
32b7c687 2872 return ret;
ae01a0ab
YZ		 2873
2874 path = btrfs_alloc_path();
2875 if (!path) {
2876 vfree(buf);
32b7c687 2877 return ret;
d525e8ab
LZ		 2878 }
2879
32b7c687 2880 path->reada = 2;
c5c9cd4d 2881 /* clone data */
33345d01 2882 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2883 key.type = BTRFS_EXTENT_DATA_KEY;
2884 key.offset = 0;
f46b5a66
CH		 2885
2886 while (1) {
2887 /*
2888 * note the key will change type as we walk through the
2889 * tree.
2890 */
362a20c5
DS		 2891 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2892 0, 0);
f46b5a66
CH		 2893 if (ret < 0)
2894 goto out;
2895
ae01a0ab
YZ		 2896 nritems = btrfs_header_nritems(path->nodes[0]);
2897 if (path->slots[0] >= nritems) {
362a20c5 2898 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2899 if (ret < 0)
2900 goto out;
2901 if (ret > 0)
2902 break;
ae01a0ab 2903 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2904 }
2905 leaf = path->nodes[0];
2906 slot = path->slots[0];
f46b5a66 2907
ae01a0ab 2908 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 2909 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 2910 key.objectid != btrfs_ino(src))
f46b5a66
CH		 2911 break;
2912
c5c9cd4d
SW		 2913 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2914 struct btrfs_file_extent_item *extent;
2915 int type;
31840ae1
ZY		 2916 u32 size;
2917 struct btrfs_key new_key;
c5c9cd4d
SW		 2918 u64 disko = 0, diskl = 0;
2919 u64 datao = 0, datal = 0;
2920 u8 comp;
b5384d48 2921 u64 endoff;
31840ae1
ZY		 2922
2923 size = btrfs_item_size_nr(leaf, slot);
2924 read_extent_buffer(leaf, buf,
2925 btrfs_item_ptr_offset(leaf, slot),
2926 size);
c5c9cd4d
SW		 2927
2928 extent = btrfs_item_ptr(leaf, slot,
2929 struct btrfs_file_extent_item);
2930 comp = btrfs_file_extent_compression(leaf, extent);
2931 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 2932 if (type == BTRFS_FILE_EXTENT_REG ||
2933 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 2934 disko = btrfs_file_extent_disk_bytenr(leaf,
2935 extent);
2936 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2937 extent);
c5c9cd4d 2938 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 2939 datal = btrfs_file_extent_num_bytes(leaf,
2940 extent);
c5c9cd4d
SW		 2941 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2942 /* take upper bound, may be compressed */
2943 datal = btrfs_file_extent_ram_bytes(leaf,
2944 extent);
2945 }
b3b4aa74 2946 btrfs_release_path(path);
31840ae1 2947
050006a7 2948 if (key.offset + datal <= off ||
aa42ffd9 2949 key.offset >= off + len - 1)
c5c9cd4d
SW		 2950 goto next;
2951
31840ae1 2952 memcpy(&new_key, &key, sizeof(new_key));
33345d01 2953 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 2954 if (off <= key.offset)
2955 new_key.offset = key.offset + destoff - off;
2956 else
2957 new_key.offset = destoff;
31840ae1 2958
b6f3409b
SW		 2959 /*
2960 * 1 - adjusting old extent (we may have to split it)
2961 * 1 - add new extent
2962 * 1 - inode update
2963 */
2964 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 2965 if (IS_ERR(trans)) {
2966 ret = PTR_ERR(trans);
2967 goto out;
2968 }
2969
c8a894d7
CM		 2970 if (type == BTRFS_FILE_EXTENT_REG ||
2971 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 2972 /*
2973 * a | --- range to clone ---| b
2974 * | ------------- extent ------------- |
2975 */
2976
2977 /* substract range b */
2978 if (key.offset + datal > off + len)
2979 datal = off + len - key.offset;
2980
2981 /* substract range a */
a22285a6
YZ		 2982 if (off > key.offset) {
2983 datao += off - key.offset;
2984 datal -= off - key.offset;
2985 }
2986
5dc562c5 2987 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2988 new_key.offset,
2989 new_key.offset + datal,
2671485d 2990 1);
79787eaa
JM		 2991 if (ret) {
2992 btrfs_abort_transaction(trans, root,
2993 ret);
2994 btrfs_end_transaction(trans, root);
2995 goto out;
2996 }
a22285a6 2997
c5c9cd4d
SW		 2998 ret = btrfs_insert_empty_item(trans, root, path,
2999 &new_key, size);
79787eaa
JM		 3000 if (ret) {
3001 btrfs_abort_transaction(trans, root,
3002 ret);
3003 btrfs_end_transaction(trans, root);
3004 goto out;
3005 }
c5c9cd4d
SW		 3006
3007 leaf = path->nodes[0];
3008 slot = path->slots[0];
3009 write_extent_buffer(leaf, buf,
31840ae1
ZY		 3010 btrfs_item_ptr_offset(leaf, slot),
3011 size);
ae01a0ab 3012
c5c9cd4d 3013 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 3014 struct btrfs_file_extent_item);
c5c9cd4d 3015
c5c9cd4d
SW		 3016 /* disko == 0 means it's a hole */
3017 if (!disko)
3018 datao = 0;
c5c9cd4d
SW		 3019
3020 btrfs_set_file_extent_offset(leaf, extent,
3021 datao);
3022 btrfs_set_file_extent_num_bytes(leaf, extent,
3023 datal);
3024 if (disko) {
3025 inode_add_bytes(inode, datal);
ae01a0ab 3026 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 3027 disko, diskl, 0,
3028 root->root_key.objectid,
33345d01 3029 btrfs_ino(inode),
66d7e7f0
AJ		 3030 new_key.offset - datao,
3031 0);
79787eaa
JM		 3032 if (ret) {
3033 btrfs_abort_transaction(trans,
3034 root,
3035 ret);
3036 btrfs_end_transaction(trans,
3037 root);
3038 goto out;
3039
3040 }
f46b5a66 3041 }
c5c9cd4d
SW		 3042 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3043 u64 skip = 0;
3044 u64 trim = 0;
3045 if (off > key.offset) {
3046 skip = off - key.offset;
3047 new_key.offset += skip;
3048 }
d397712b 3049
aa42ffd9
LB		 3050 if (key.offset + datal > off + len)
3051 trim = key.offset + datal - (off + len);
d397712b 3052
c5c9cd4d 3053 if (comp && (skip || trim)) {
c5c9cd4d 3054 ret = -EINVAL;
a22285a6 3055 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 3056 goto out;
3057 }
3058 size -= skip + trim;
3059 datal -= skip + trim;
a22285a6 3060
5dc562c5 3061 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 3062 new_key.offset,
3063 new_key.offset + datal,
2671485d 3064 1);
79787eaa
JM		 3065 if (ret) {
3066 btrfs_abort_transaction(trans, root,
3067 ret);
3068 btrfs_end_transaction(trans, root);
3069 goto out;
3070 }
a22285a6 3071
c5c9cd4d
SW		 3072 ret = btrfs_insert_empty_item(trans, root, path,
3073 &new_key, size);
79787eaa
JM		 3074 if (ret) {
3075 btrfs_abort_transaction(trans, root,
3076 ret);
3077 btrfs_end_transaction(trans, root);
3078 goto out;
3079 }
c5c9cd4d
SW		 3080
3081 if (skip) {
d397712b
CM		 3082 u32 start =
3083 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 3084 memmove(buf+start, buf+start+skip,
3085 datal);
3086 }
3087
3088 leaf = path->nodes[0];
3089 slot = path->slots[0];
3090 write_extent_buffer(leaf, buf,
3091 btrfs_item_ptr_offset(leaf, slot),
3092 size);
3093 inode_add_bytes(inode, datal);
f46b5a66 3094 }
c5c9cd4d
SW		 3095
3096 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 3097 btrfs_release_path(path);
c5c9cd4d 3098
0c4d2d95 3099 inode_inc_iversion(inode);
a22285a6 3100 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 3101
3102 /*
3103 * we round up to the block size at eof when
3104 * determining which extents to clone above,
3105 * but shouldn't round up the file size
3106 */
3107 endoff = new_key.offset + datal;
5f3888ff
LZ		 3108 if (endoff > destoff+olen)
3109 endoff = destoff+olen;
b5384d48
SW		 3110 if (endoff > inode->i_size)
3111 btrfs_i_size_write(inode, endoff);
3112
a22285a6 3113 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 3114 if (ret) {
3115 btrfs_abort_transaction(trans, root, ret);
3116 btrfs_end_transaction(trans, root);
3117 goto out;
3118 }
3119 ret = btrfs_end_transaction(trans, root);
a22285a6 3120 }
d397712b 3121next:
b3b4aa74 3122 btrfs_release_path(path);
f46b5a66 3123 key.offset++;
f46b5a66 3124 }
f46b5a66 3125 ret = 0;
32b7c687 3126
f46b5a66 3127out:
b3b4aa74 3128 btrfs_release_path(path);
32b7c687
MF		 3129 btrfs_free_path(path);
3130 vfree(buf);
3131 return ret;
3132}
3133
3134static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3135 u64 off, u64 olen, u64 destoff)
3136{
54563d41 3137 struct inode *inode = file_inode(file);
32b7c687
MF		 3138 struct btrfs_root *root = BTRFS_I(inode)->root;
3139 struct fd src_file;
3140 struct inode *src;
3141 int ret;
3142 u64 len = olen;
3143 u64 bs = root->fs_info->sb->s_blocksize;
3144 int same_inode = 0;
3145
3146 /*
3147 * TODO:
3148 * - split compressed inline extents. annoying: we need to
3149 * decompress into destination's address_space (the file offset
3150 * may change, so source mapping won't do), then recompress (or
3151 * otherwise reinsert) a subrange.
3152 * - allow ranges within the same file to be cloned (provided
3153 * they don't overlap)?
3154 */
3155
3156 /* the destination must be opened for writing */
3157 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3158 return -EINVAL;
3159
3160 if (btrfs_root_readonly(root))
3161 return -EROFS;
3162
3163 ret = mnt_want_write_file(file);
3164 if (ret)
3165 return ret;
3166
3167 src_file = fdget(srcfd);
3168 if (!src_file.file) {
3169 ret = -EBADF;
3170 goto out_drop_write;
3171 }
3172
3173 ret = -EXDEV;
3174 if (src_file.file->f_path.mnt != file->f_path.mnt)
3175 goto out_fput;
3176
3177 src = file_inode(src_file.file);
3178
3179 ret = -EINVAL;
3180 if (src == inode)
3181 same_inode = 1;
3182
3183 /* the src must be open for reading */
3184 if (!(src_file.file->f_mode & FMODE_READ))
3185 goto out_fput;
3186
3187 /* don't make the dst file partly checksummed */
3188 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3189 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3190 goto out_fput;
3191
3192 ret = -EISDIR;
3193 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3194 goto out_fput;
3195
3196 ret = -EXDEV;
3197 if (src->i_sb != inode->i_sb)
3198 goto out_fput;
3199
3200 if (!same_inode) {
3201 if (inode < src) {
3202 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3203 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3204 } else {
3205 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3206 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3207 }
3208 } else {
3209 mutex_lock(&src->i_mutex);
3210 }
3211
3212 /* determine range to clone */
3213 ret = -EINVAL;
3214 if (off + len > src->i_size || off + len < off)
3215 goto out_unlock;
3216 if (len == 0)
3217 olen = len = src->i_size - off;
3218 /* if we extend to eof, continue to block boundary */
3219 if (off + len == src->i_size)
3220 len = ALIGN(src->i_size, bs) - off;
3221
3222 /* verify the end result is block aligned */
3223 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3224 !IS_ALIGNED(destoff, bs))
3225 goto out_unlock;
3226
3227 /* verify if ranges are overlapped within the same file */
3228 if (same_inode) {
3229 if (destoff + len > off && destoff < off + len)
3230 goto out_unlock;
3231 }
3232
3233 if (destoff > inode->i_size) {
3234 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3235 if (ret)
3236 goto out_unlock;
3237 }
3238
3239 /* truncate page cache pages from target inode range */
3240 truncate_inode_pages_range(&inode->i_data, destoff,
3241 PAGE_CACHE_ALIGN(destoff + len) - 1);
3242
3243 lock_extent_range(src, off, len);
3244
3245 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3246
aa42ffd9 3247 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66
CH		 3248out_unlock:
3249 mutex_unlock(&src->i_mutex);
a96fbc72
LB		 3250 if (!same_inode)
3251 mutex_unlock(&inode->i_mutex);
f46b5a66 3252out_fput:
2903ff01 3253 fdput(src_file);
ab67b7c1 3254out_drop_write:
2a79f17e 3255 mnt_drop_write_file(file);
f46b5a66
CH		 3256 return ret;
3257}
3258
7a865e8a 3259static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 3260{
3261 struct btrfs_ioctl_clone_range_args args;
3262
7a865e8a 3263 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 3264 return -EFAULT;
3265 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3266 args.src_length, args.dest_offset);
3267}
3268
f46b5a66
CH		 3269/*
3270 * there are many ways the trans_start and trans_end ioctls can lead
3271 * to deadlocks. They should only be used by applications that
3272 * basically own the machine, and have a very in depth understanding
3273 * of all the possible deadlocks and enospc problems.
3274 */
b2950863 3275static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66 3276{
496ad9aa 3277 struct inode *inode = file_inode(file);
f46b5a66
CH		 3278 struct btrfs_root *root = BTRFS_I(inode)->root;
3279 struct btrfs_trans_handle *trans;
1ab86aed 3280 int ret;
f46b5a66 3281
1ab86aed 3282 ret = -EPERM;
df5b5520 3283 if (!capable(CAP_SYS_ADMIN))
1ab86aed 3284 goto out;
df5b5520 3285
1ab86aed
SW		 3286 ret = -EINPROGRESS;
3287 if (file->private_data)
f46b5a66 3288 goto out;
9ca9ee09 3289
b83cc969
LZ		 3290 ret = -EROFS;
3291 if (btrfs_root_readonly(root))
3292 goto out;
3293
a561be71 3294 ret = mnt_want_write_file(file);
c146afad
YZ		 3295 if (ret)
3296 goto out;
3297
a4abeea4 3298 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 3299
1ab86aed 3300 ret = -ENOMEM;
7a7eaa40 3301 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 3302 if (IS_ERR(trans))
1ab86aed
SW		 3303 goto out_drop;
3304
3305 file->private_data = trans;
3306 return 0;
3307
3308out_drop:
a4abeea4 3309 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 3310 mnt_drop_write_file(file);
f46b5a66 3311out:
f46b5a66
CH		 3312 return ret;
3313}
3314
6ef5ed0d
JB		 3315static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3316{
496ad9aa 3317 struct inode *inode = file_inode(file);
6ef5ed0d
JB		 3318 struct btrfs_root *root = BTRFS_I(inode)->root;
3319 struct btrfs_root *new_root;
3320 struct btrfs_dir_item *di;
3321 struct btrfs_trans_handle *trans;
3322 struct btrfs_path *path;
3323 struct btrfs_key location;
3324 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 3325 u64 objectid = 0;
3326 u64 dir_id;
3c04ce01 3327 int ret;
6ef5ed0d
JB		 3328
3329 if (!capable(CAP_SYS_ADMIN))
3330 return -EPERM;
3331
3c04ce01
MX		 3332 ret = mnt_want_write_file(file);
3333 if (ret)
3334 return ret;
3335
3336 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3337 ret = -EFAULT;
3338 goto out;
3339 }
6ef5ed0d
JB		 3340
3341 if (!objectid)
1cecf579 3342 objectid = BTRFS_FS_TREE_OBJECTID;
6ef5ed0d
JB		 3343
3344 location.objectid = objectid;
3345 location.type = BTRFS_ROOT_ITEM_KEY;
3346 location.offset = (u64)-1;
3347
3348 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3c04ce01
MX		 3349 if (IS_ERR(new_root)) {
3350 ret = PTR_ERR(new_root);
3351 goto out;
3352 }
6ef5ed0d 3353
6ef5ed0d 3354 path = btrfs_alloc_path();
3c04ce01
MX		 3355 if (!path) {
3356 ret = -ENOMEM;
3357 goto out;
3358 }
6ef5ed0d
JB		 3359 path->leave_spinning = 1;
3360
3361 trans = btrfs_start_transaction(root, 1);
98d5dc13 3362 if (IS_ERR(trans)) {
6ef5ed0d 3363 btrfs_free_path(path);
3c04ce01
MX		 3364 ret = PTR_ERR(trans);
3365 goto out;
6ef5ed0d
JB		 3366 }
3367
6c41761f 3368 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 3369 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3370 dir_id, "default", 7, 1);
cf1e99a4 3371 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 3372 btrfs_free_path(path);
3373 btrfs_end_transaction(trans, root);
efe120a0
FH		 3374 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
3375 "item, this isn't going to work");
3c04ce01
MX		 3376 ret = -ENOENT;
3377 goto out;
6ef5ed0d
JB		 3378 }
3379
3380 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3381 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3382 btrfs_mark_buffer_dirty(path->nodes[0]);
3383 btrfs_free_path(path);
3384
2b0ce2c2 3385 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d 3386 btrfs_end_transaction(trans, root);
3c04ce01
MX		 3387out:
3388 mnt_drop_write_file(file);
3389 return ret;
6ef5ed0d
JB		 3390}
3391
5af3e8cc
SB		 3392void btrfs_get_block_group_info(struct list_head *groups_list,
3393 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 3394{
3395 struct btrfs_block_group_cache *block_group;
3396
3397 space->total_bytes = 0;
3398 space->used_bytes = 0;
3399 space->flags = 0;
3400 list_for_each_entry(block_group, groups_list, list) {
3401 space->flags = block_group->flags;
3402 space->total_bytes += block_group->key.offset;
3403 space->used_bytes +=
3404 btrfs_block_group_used(&block_group->item);
3405 }
3406}
3407
48a3b636 3408static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1406e432
JB		 3409{
3410 struct btrfs_ioctl_space_args space_args;
3411 struct btrfs_ioctl_space_info space;
3412 struct btrfs_ioctl_space_info *dest;
7fde62bf 3413 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 3414 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 3415 struct btrfs_space_info *info;
bf5fc093
JB		 3416 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3417 BTRFS_BLOCK_GROUP_SYSTEM,
3418 BTRFS_BLOCK_GROUP_METADATA,
3419 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3420 int num_types = 4;
7fde62bf 3421 int alloc_size;
1406e432 3422 int ret = 0;
51788b1b 3423 u64 slot_count = 0;
bf5fc093 3424 int i, c;
1406e432
JB		 3425
3426 if (copy_from_user(&space_args,
3427 (struct btrfs_ioctl_space_args __user *)arg,
3428 sizeof(space_args)))
3429 return -EFAULT;
3430
bf5fc093
JB		 3431 for (i = 0; i < num_types; i++) {
3432 struct btrfs_space_info *tmp;
3433
3434 info = NULL;
3435 rcu_read_lock();
3436 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3437 list) {
3438 if (tmp->flags == types[i]) {
3439 info = tmp;
3440 break;
3441 }
3442 }
3443 rcu_read_unlock();
3444
3445 if (!info)
3446 continue;
3447
3448 down_read(&info->groups_sem);
3449 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3450 if (!list_empty(&info->block_groups[c]))
3451 slot_count++;
3452 }
3453 up_read(&info->groups_sem);
3454 }
7fde62bf
CM		 3455
3456 /* space_slots == 0 means they are asking for a count */
3457 if (space_args.space_slots == 0) {
3458 space_args.total_spaces = slot_count;
3459 goto out;
3460 }
bf5fc093 3461
51788b1b 3462 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 3463
7fde62bf 3464 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 3465
7fde62bf
CM		 3466 /* we generally have at most 6 or so space infos, one for each raid
3467 * level. So, a whole page should be more than enough for everyone
3468 */
3469 if (alloc_size > PAGE_CACHE_SIZE)
3470 return -ENOMEM;
3471
1406e432 3472 space_args.total_spaces = 0;
7fde62bf
CM		 3473 dest = kmalloc(alloc_size, GFP_NOFS);
3474 if (!dest)
3475 return -ENOMEM;
3476 dest_orig = dest;
1406e432 3477
7fde62bf 3478 /* now we have a buffer to copy into */
bf5fc093
JB		 3479 for (i = 0; i < num_types; i++) {
3480 struct btrfs_space_info *tmp;
3481
51788b1b
DR		 3482 if (!slot_count)
3483 break;
3484
bf5fc093
JB		 3485 info = NULL;
3486 rcu_read_lock();
3487 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3488 list) {
3489 if (tmp->flags == types[i]) {
3490 info = tmp;
3491 break;
3492 }
3493 }
3494 rcu_read_unlock();
7fde62bf 3495
bf5fc093
JB		 3496 if (!info)
3497 continue;
3498 down_read(&info->groups_sem);
3499 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3500 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 3501 btrfs_get_block_group_info(
3502 &info->block_groups[c], &space);
bf5fc093
JB		 3503 memcpy(dest, &space, sizeof(space));
3504 dest++;
3505 space_args.total_spaces++;
51788b1b 3506 slot_count--;
bf5fc093 3507 }
51788b1b
DR		 3508 if (!slot_count)
3509 break;
bf5fc093
JB		 3510 }
3511 up_read(&info->groups_sem);
1406e432 3512 }
1406e432 3513
2eec6c81 3514 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3515 (arg + sizeof(struct btrfs_ioctl_space_args));
3516
3517 if (copy_to_user(user_dest, dest_orig, alloc_size))
3518 ret = -EFAULT;
3519
3520 kfree(dest_orig);
3521out:
3522 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3523 ret = -EFAULT;
3524
3525 return ret;
3526}
3527
01e219e8
JM		 3528static long btrfs_ioctl_global_rsv(struct btrfs_root *root, void __user *arg)
3529{
3530 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
3531 u64 reserved;
3532
3533 spin_lock(&block_rsv->lock);
3534 reserved = block_rsv->reserved;
3535 spin_unlock(&block_rsv->lock);
3536
3537 if (arg && copy_to_user(arg, &reserved, sizeof(reserved)))
3538 return -EFAULT;
3539 return 0;
3540}
3541
f46b5a66
CH		 3542/*
3543 * there are many ways the trans_start and trans_end ioctls can lead
3544 * to deadlocks. They should only be used by applications that
3545 * basically own the machine, and have a very in depth understanding
3546 * of all the possible deadlocks and enospc problems.
3547 */
3548long btrfs_ioctl_trans_end(struct file *file)
3549{
496ad9aa 3550 struct inode *inode = file_inode(file);
f46b5a66
CH		 3551 struct btrfs_root *root = BTRFS_I(inode)->root;
3552 struct btrfs_trans_handle *trans;
f46b5a66 3553
f46b5a66 3554 trans = file->private_data;
1ab86aed
SW		 3555 if (!trans)
3556 return -EINVAL;
b214107e 3557 file->private_data = NULL;
9ca9ee09 3558
1ab86aed
SW		 3559 btrfs_end_transaction(trans, root);
3560
a4abeea4 3561 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3562
2a79f17e 3563 mnt_drop_write_file(file);
1ab86aed 3564 return 0;
f46b5a66
CH		 3565}
3566
9a8c28be
MX		 3567static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3568 void __user *argp)
46204592 3569{
46204592
SW		 3570 struct btrfs_trans_handle *trans;
3571 u64 transid;
db5b493a 3572 int ret;
46204592 3573
d4edf39b 3574 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 3575 if (IS_ERR(trans)) {
3576 if (PTR_ERR(trans) != -ENOENT)
3577 return PTR_ERR(trans);
3578
3579 /* No running transaction, don't bother */
3580 transid = root->fs_info->last_trans_committed;
3581 goto out;
3582 }
46204592 3583 transid = trans->transid;
db5b493a 3584 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3585 if (ret) {
3586 btrfs_end_transaction(trans, root);
db5b493a 3587 return ret;
8b2b2d3c 3588 }
ff7c1d33 3589out:
46204592
SW		 3590 if (argp)
3591 if (copy_to_user(argp, &transid, sizeof(transid)))
3592 return -EFAULT;
3593 return 0;
3594}
3595
9a8c28be
MX		 3596static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3597 void __user *argp)
46204592 3598{
46204592
SW		 3599 u64 transid;
3600
3601 if (argp) {
3602 if (copy_from_user(&transid, argp, sizeof(transid)))
3603 return -EFAULT;
3604 } else {
3605 transid = 0; /* current trans */
3606 }
3607 return btrfs_wait_for_commit(root, transid);
3608}
3609
b8e95489 3610static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 3611{
496ad9aa 3612 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
475f6387 3613 struct btrfs_ioctl_scrub_args *sa;
b8e95489 3614 int ret;
475f6387
JS		 3615
3616 if (!capable(CAP_SYS_ADMIN))
3617 return -EPERM;
3618
3619 sa = memdup_user(arg, sizeof(*sa));
3620 if (IS_ERR(sa))
3621 return PTR_ERR(sa);
3622
b8e95489
MX		 3623 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3624 ret = mnt_want_write_file(file);
3625 if (ret)
3626 goto out;
3627 }
3628
aa1b8cd4 3629 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 3630 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3631 0);
475f6387
JS		 3632
3633 if (copy_to_user(arg, sa, sizeof(*sa)))
3634 ret = -EFAULT;
3635
b8e95489
MX		 3636 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3637 mnt_drop_write_file(file);
3638out:
475f6387
JS		 3639 kfree(sa);
3640 return ret;
3641}
3642
3643static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3644{
3645 if (!capable(CAP_SYS_ADMIN))
3646 return -EPERM;
3647
aa1b8cd4 3648 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3649}
3650
3651static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3652 void __user *arg)
3653{
3654 struct btrfs_ioctl_scrub_args *sa;
3655 int ret;
3656
3657 if (!capable(CAP_SYS_ADMIN))
3658 return -EPERM;
3659
3660 sa = memdup_user(arg, sizeof(*sa));
3661 if (IS_ERR(sa))
3662 return PTR_ERR(sa);
3663
3664 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3665
3666 if (copy_to_user(arg, sa, sizeof(*sa)))
3667 ret = -EFAULT;
3668
3669 kfree(sa);
3670 return ret;
3671}
3672
c11d2c23 3673static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3674 void __user *arg)
c11d2c23
SB		 3675{
3676 struct btrfs_ioctl_get_dev_stats *sa;
3677 int ret;
3678
c11d2c23
SB		 3679 sa = memdup_user(arg, sizeof(*sa));
3680 if (IS_ERR(sa))
3681 return PTR_ERR(sa);
3682
b27f7c0c
DS		 3683 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3684 kfree(sa);
3685 return -EPERM;
3686 }
3687
3688 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3689
3690 if (copy_to_user(arg, sa, sizeof(*sa)))
3691 ret = -EFAULT;
3692
3693 kfree(sa);
3694 return ret;
3695}
3696
3f6bcfbd
SB		 3697static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3698{
3699 struct btrfs_ioctl_dev_replace_args *p;
3700 int ret;
3701
3702 if (!capable(CAP_SYS_ADMIN))
3703 return -EPERM;
3704
3705 p = memdup_user(arg, sizeof(*p));
3706 if (IS_ERR(p))
3707 return PTR_ERR(p);
3708
3709 switch (p->cmd) {
3710 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
adfa97cb
ID		 3711 if (root->fs_info->sb->s_flags & MS_RDONLY) {
3712 ret = -EROFS;
3713 goto out;
3714 }
3f6bcfbd
SB		 3715 if (atomic_xchg(
3716 &root->fs_info->mutually_exclusive_operation_running,
3717 1)) {
e57138b3 3718 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd
SB		 3719 } else {
3720 ret = btrfs_dev_replace_start(root, p);
3721 atomic_set(
3722 &root->fs_info->mutually_exclusive_operation_running,
3723 0);
3724 }
3725 break;
3726 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3727 btrfs_dev_replace_status(root->fs_info, p);
3728 ret = 0;
3729 break;
3730 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3731 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3732 break;
3733 default:
3734 ret = -EINVAL;
3735 break;
3736 }
3737
3738 if (copy_to_user(arg, p, sizeof(*p)))
3739 ret = -EFAULT;
adfa97cb 3740out:
3f6bcfbd
SB		 3741 kfree(p);
3742 return ret;
3743}
3744
d7728c96
JS		 3745static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3746{
3747 int ret = 0;
3748 int i;
740c3d22 3749 u64 rel_ptr;
d7728c96 3750 int size;
806468f8 3751 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3752 struct inode_fs_paths *ipath = NULL;
3753 struct btrfs_path *path;
3754
82b22ac8 3755 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 3756 return -EPERM;
3757
3758 path = btrfs_alloc_path();
3759 if (!path) {
3760 ret = -ENOMEM;
3761 goto out;
3762 }
3763
3764 ipa = memdup_user(arg, sizeof(*ipa));
3765 if (IS_ERR(ipa)) {
3766 ret = PTR_ERR(ipa);
3767 ipa = NULL;
3768 goto out;
3769 }
3770
3771 size = min_t(u32, ipa->size, 4096);
3772 ipath = init_ipath(size, root, path);
3773 if (IS_ERR(ipath)) {
3774 ret = PTR_ERR(ipath);
3775 ipath = NULL;
3776 goto out;
3777 }
3778
3779 ret = paths_from_inode(ipa->inum, ipath);
3780 if (ret < 0)
3781 goto out;
3782
3783 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3784 rel_ptr = ipath->fspath->val[i] -
3785 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3786 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3787 }
3788
745c4d8e
JM		 3789 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3790 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3791 if (ret) {
3792 ret = -EFAULT;
3793 goto out;
3794 }
3795
3796out:
3797 btrfs_free_path(path);
3798 free_ipath(ipath);
3799 kfree(ipa);
3800
3801 return ret;
3802}
3803
3804static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3805{
3806 struct btrfs_data_container *inodes = ctx;
3807 const size_t c = 3 * sizeof(u64);
3808
3809 if (inodes->bytes_left >= c) {
3810 inodes->bytes_left -= c;
3811 inodes->val[inodes->elem_cnt] = inum;
3812 inodes->val[inodes->elem_cnt + 1] = offset;
3813 inodes->val[inodes->elem_cnt + 2] = root;
3814 inodes->elem_cnt += 3;
3815 } else {
3816 inodes->bytes_missing += c - inodes->bytes_left;
3817 inodes->bytes_left = 0;
3818 inodes->elem_missed += 3;
3819 }
3820
3821 return 0;
3822}
3823
3824static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3825 void __user *arg)
3826{
3827 int ret = 0;
3828 int size;
d7728c96
JS		 3829 struct btrfs_ioctl_logical_ino_args *loi;
3830 struct btrfs_data_container *inodes = NULL;
3831 struct btrfs_path *path = NULL;
d7728c96
JS		 3832
3833 if (!capable(CAP_SYS_ADMIN))
3834 return -EPERM;
3835
3836 loi = memdup_user(arg, sizeof(*loi));
3837 if (IS_ERR(loi)) {
3838 ret = PTR_ERR(loi);
3839 loi = NULL;
3840 goto out;
3841 }
3842
3843 path = btrfs_alloc_path();
3844 if (!path) {
3845 ret = -ENOMEM;
3846 goto out;
3847 }
3848
425d17a2 3849 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3850 inodes = init_data_container(size);
3851 if (IS_ERR(inodes)) {
3852 ret = PTR_ERR(inodes);
3853 inodes = NULL;
3854 goto out;
3855 }
3856
df031f07
LB		 3857 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3858 build_ino_list, inodes);
3859 if (ret == -EINVAL)
d7728c96
JS		 3860 ret = -ENOENT;
3861 if (ret < 0)
3862 goto out;
3863
745c4d8e
JM		 3864 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3865 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3866 if (ret)
3867 ret = -EFAULT;
3868
3869out:
3870 btrfs_free_path(path);
425d17a2 3871 vfree(inodes);
d7728c96
JS		 3872 kfree(loi);
3873
3874 return ret;
3875}
3876
19a39dce 3877void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3878 struct btrfs_ioctl_balance_args *bargs)
3879{
3880 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3881
3882 bargs->flags = bctl->flags;
3883
837d5b6e
ID		 3884 if (atomic_read(&fs_info->balance_running))
3885 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3886 if (atomic_read(&fs_info->balance_pause_req))
3887 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3888 if (atomic_read(&fs_info->balance_cancel_req))
3889 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3890
c9e9f97b
ID		 3891 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3892 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3893 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3894
3895 if (lock) {
3896 spin_lock(&fs_info->balance_lock);
3897 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3898 spin_unlock(&fs_info->balance_lock);
3899 } else {
3900 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3901 }
c9e9f97b
ID		 3902}
3903
9ba1f6e4 3904static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 3905{
496ad9aa 3906 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 3907 struct btrfs_fs_info *fs_info = root->fs_info;
3908 struct btrfs_ioctl_balance_args *bargs;
3909 struct btrfs_balance_control *bctl;
ed0fb78f 3910 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 3911 int ret;
3912
3913 if (!capable(CAP_SYS_ADMIN))
3914 return -EPERM;
3915
e54bfa31 3916 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 3917 if (ret)
3918 return ret;
3919
ed0fb78f
ID		 3920again:
3921 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
3922 mutex_lock(&fs_info->volume_mutex);
3923 mutex_lock(&fs_info->balance_mutex);
3924 need_unlock = true;
3925 goto locked;
3926 }
3927
3928 /*
3929 * mut. excl. ops lock is locked. Three possibilites:
3930 * (1) some other op is running
3931 * (2) balance is running
3932 * (3) balance is paused -- special case (think resume)
3933 */
c9e9f97b 3934 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 3935 if (fs_info->balance_ctl) {
3936 /* this is either (2) or (3) */
3937 if (!atomic_read(&fs_info->balance_running)) {
3938 mutex_unlock(&fs_info->balance_mutex);
3939 if (!mutex_trylock(&fs_info->volume_mutex))
3940 goto again;
3941 mutex_lock(&fs_info->balance_mutex);
3942
3943 if (fs_info->balance_ctl &&
3944 !atomic_read(&fs_info->balance_running)) {
3945 /* this is (3) */
3946 need_unlock = false;
3947 goto locked;
3948 }
3949
3950 mutex_unlock(&fs_info->balance_mutex);
3951 mutex_unlock(&fs_info->volume_mutex);
3952 goto again;
3953 } else {
3954 /* this is (2) */
3955 mutex_unlock(&fs_info->balance_mutex);
3956 ret = -EINPROGRESS;
3957 goto out;
3958 }
3959 } else {
3960 /* this is (1) */
3961 mutex_unlock(&fs_info->balance_mutex);
e57138b3 3962 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 3963 goto out;
3964 }
3965
3966locked:
3967 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
c9e9f97b
ID		 3968
3969 if (arg) {
3970 bargs = memdup_user(arg, sizeof(*bargs));
3971 if (IS_ERR(bargs)) {
3972 ret = PTR_ERR(bargs);
ed0fb78f 3973 goto out_unlock;
c9e9f97b 3974 }
de322263
ID		 3975
3976 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3977 if (!fs_info->balance_ctl) {
3978 ret = -ENOTCONN;
3979 goto out_bargs;
3980 }
3981
3982 bctl = fs_info->balance_ctl;
3983 spin_lock(&fs_info->balance_lock);
3984 bctl->flags |= BTRFS_BALANCE_RESUME;
3985 spin_unlock(&fs_info->balance_lock);
3986
3987 goto do_balance;
3988 }
c9e9f97b
ID		 3989 } else {
3990 bargs = NULL;
3991 }
3992
ed0fb78f 3993 if (fs_info->balance_ctl) {
837d5b6e
ID		 3994 ret = -EINPROGRESS;
3995 goto out_bargs;
3996 }
3997
c9e9f97b
ID		 3998 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3999 if (!bctl) {
4000 ret = -ENOMEM;
4001 goto out_bargs;
4002 }
4003
4004 bctl->fs_info = fs_info;
4005 if (arg) {
4006 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4007 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4008 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4009
4010 bctl->flags = bargs->flags;
f43ffb60
ID		 4011 } else {
4012 /* balance everything - no filters */
4013 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 4014 }
4015
de322263 4016do_balance:
c9e9f97b 4017 /*
ed0fb78f
ID		 4018 * Ownership of bctl and mutually_exclusive_operation_running
4019 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4020 * or, if restriper was paused all the way until unmount, in
4021 * free_fs_info. mutually_exclusive_operation_running is
4022 * cleared in __cancel_balance.
c9e9f97b 4023 */
ed0fb78f
ID		 4024 need_unlock = false;
4025
4026 ret = btrfs_balance(bctl, bargs);
4027
c9e9f97b
ID		 4028 if (arg) {
4029 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4030 ret = -EFAULT;
4031 }
4032
4033out_bargs:
4034 kfree(bargs);
ed0fb78f 4035out_unlock:
c9e9f97b
ID		 4036 mutex_unlock(&fs_info->balance_mutex);
4037 mutex_unlock(&fs_info->volume_mutex);
ed0fb78f
ID		 4038 if (need_unlock)
4039 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4040out:
e54bfa31 4041 mnt_drop_write_file(file);
c9e9f97b
ID		 4042 return ret;
4043}
4044
837d5b6e
ID		 4045static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4046{
4047 if (!capable(CAP_SYS_ADMIN))
4048 return -EPERM;
4049
4050 switch (cmd) {
4051 case BTRFS_BALANCE_CTL_PAUSE:
4052 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 4053 case BTRFS_BALANCE_CTL_CANCEL:
4054 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 4055 }
4056
4057 return -EINVAL;
4058}
4059
19a39dce
ID		 4060static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4061 void __user *arg)
4062{
4063 struct btrfs_fs_info *fs_info = root->fs_info;
4064 struct btrfs_ioctl_balance_args *bargs;
4065 int ret = 0;
4066
4067 if (!capable(CAP_SYS_ADMIN))
4068 return -EPERM;
4069
4070 mutex_lock(&fs_info->balance_mutex);
4071 if (!fs_info->balance_ctl) {
4072 ret = -ENOTCONN;
4073 goto out;
4074 }
4075
4076 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4077 if (!bargs) {
4078 ret = -ENOMEM;
4079 goto out;
4080 }
4081
4082 update_ioctl_balance_args(fs_info, 1, bargs);
4083
4084 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4085 ret = -EFAULT;
4086
4087 kfree(bargs);
4088out:
4089 mutex_unlock(&fs_info->balance_mutex);
4090 return ret;
4091}
4092
905b0dda 4093static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4094{
496ad9aa 4095 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4096 struct btrfs_ioctl_quota_ctl_args *sa;
4097 struct btrfs_trans_handle *trans = NULL;
4098 int ret;
4099 int err;
4100
4101 if (!capable(CAP_SYS_ADMIN))
4102 return -EPERM;
4103
905b0dda
MX		 4104 ret = mnt_want_write_file(file);
4105 if (ret)
4106 return ret;
5d13a37b
AJ		 4107
4108 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4109 if (IS_ERR(sa)) {
4110 ret = PTR_ERR(sa);
4111 goto drop_write;
4112 }
5d13a37b 4113
7708f029 4114 down_write(&root->fs_info->subvol_sem);
2f232036
JS		 4115 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4116 if (IS_ERR(trans)) {
4117 ret = PTR_ERR(trans);
4118 goto out;
5d13a37b
AJ		 4119 }
4120
4121 switch (sa->cmd) {
4122 case BTRFS_QUOTA_CTL_ENABLE:
4123 ret = btrfs_quota_enable(trans, root->fs_info);
4124 break;
4125 case BTRFS_QUOTA_CTL_DISABLE:
4126 ret = btrfs_quota_disable(trans, root->fs_info);
4127 break;
5d13a37b
AJ		 4128 default:
4129 ret = -EINVAL;
4130 break;
4131 }
4132
2f232036
JS		 4133 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4134 if (err && !ret)
4135 ret = err;
5d13a37b
AJ		 4136out:
4137 kfree(sa);
7708f029 4138 up_write(&root->fs_info->subvol_sem);
905b0dda
MX		 4139drop_write:
4140 mnt_drop_write_file(file);
5d13a37b
AJ		 4141 return ret;
4142}
4143
905b0dda 4144static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4145{
496ad9aa 4146 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4147 struct btrfs_ioctl_qgroup_assign_args *sa;
4148 struct btrfs_trans_handle *trans;
4149 int ret;
4150 int err;
4151
4152 if (!capable(CAP_SYS_ADMIN))
4153 return -EPERM;
4154
905b0dda
MX		 4155 ret = mnt_want_write_file(file);
4156 if (ret)
4157 return ret;
5d13a37b
AJ		 4158
4159 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4160 if (IS_ERR(sa)) {
4161 ret = PTR_ERR(sa);
4162 goto drop_write;
4163 }
5d13a37b
AJ		 4164
4165 trans = btrfs_join_transaction(root);
4166 if (IS_ERR(trans)) {
4167 ret = PTR_ERR(trans);
4168 goto out;
4169 }
4170
4171 /* FIXME: check if the IDs really exist */
4172 if (sa->assign) {
4173 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4174 sa->src, sa->dst);
4175 } else {
4176 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4177 sa->src, sa->dst);
4178 }
4179
4180 err = btrfs_end_transaction(trans, root);
4181 if (err && !ret)
4182 ret = err;
4183
4184out:
4185 kfree(sa);
905b0dda
MX		 4186drop_write:
4187 mnt_drop_write_file(file);
5d13a37b
AJ		 4188 return ret;
4189}
4190
905b0dda 4191static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4192{
496ad9aa 4193 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4194 struct btrfs_ioctl_qgroup_create_args *sa;
4195 struct btrfs_trans_handle *trans;
4196 int ret;
4197 int err;
4198
4199 if (!capable(CAP_SYS_ADMIN))
4200 return -EPERM;
4201
905b0dda
MX		 4202 ret = mnt_want_write_file(file);
4203 if (ret)
4204 return ret;
5d13a37b
AJ		 4205
4206 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4207 if (IS_ERR(sa)) {
4208 ret = PTR_ERR(sa);
4209 goto drop_write;
4210 }
5d13a37b 4211
d86e56cf
MX		 4212 if (!sa->qgroupid) {
4213 ret = -EINVAL;
4214 goto out;
4215 }
4216
5d13a37b
AJ		 4217 trans = btrfs_join_transaction(root);
4218 if (IS_ERR(trans)) {
4219 ret = PTR_ERR(trans);
4220 goto out;
4221 }
4222
4223 /* FIXME: check if the IDs really exist */
4224 if (sa->create) {
4225 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4226 NULL);
4227 } else {
4228 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4229 }
4230
4231 err = btrfs_end_transaction(trans, root);
4232 if (err && !ret)
4233 ret = err;
4234
4235out:
4236 kfree(sa);
905b0dda
MX		 4237drop_write:
4238 mnt_drop_write_file(file);
5d13a37b
AJ		 4239 return ret;
4240}
4241
905b0dda 4242static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4243{
496ad9aa 4244 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4245 struct btrfs_ioctl_qgroup_limit_args *sa;
4246 struct btrfs_trans_handle *trans;
4247 int ret;
4248 int err;
4249 u64 qgroupid;
4250
4251 if (!capable(CAP_SYS_ADMIN))
4252 return -EPERM;
4253
905b0dda
MX		 4254 ret = mnt_want_write_file(file);
4255 if (ret)
4256 return ret;
5d13a37b
AJ		 4257
4258 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4259 if (IS_ERR(sa)) {
4260 ret = PTR_ERR(sa);
4261 goto drop_write;
4262 }
5d13a37b
AJ		 4263
4264 trans = btrfs_join_transaction(root);
4265 if (IS_ERR(trans)) {
4266 ret = PTR_ERR(trans);
4267 goto out;
4268 }
4269
4270 qgroupid = sa->qgroupid;
4271 if (!qgroupid) {
4272 /* take the current subvol as qgroup */
4273 qgroupid = root->root_key.objectid;
4274 }
4275
4276 /* FIXME: check if the IDs really exist */
4277 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4278
4279 err = btrfs_end_transaction(trans, root);
4280 if (err && !ret)
4281 ret = err;
4282
4283out:
4284 kfree(sa);
905b0dda
MX		 4285drop_write:
4286 mnt_drop_write_file(file);
5d13a37b
AJ		 4287 return ret;
4288}
4289
2f232036
JS		 4290static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4291{
6d0379ec 4292 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4293 struct btrfs_ioctl_quota_rescan_args *qsa;
4294 int ret;
4295
4296 if (!capable(CAP_SYS_ADMIN))
4297 return -EPERM;
4298
4299 ret = mnt_want_write_file(file);
4300 if (ret)
4301 return ret;
4302
4303 qsa = memdup_user(arg, sizeof(*qsa));
4304 if (IS_ERR(qsa)) {
4305 ret = PTR_ERR(qsa);
4306 goto drop_write;
4307 }
4308
4309 if (qsa->flags) {
4310 ret = -EINVAL;
4311 goto out;
4312 }
4313
4314 ret = btrfs_qgroup_rescan(root->fs_info);
4315
4316out:
4317 kfree(qsa);
4318drop_write:
4319 mnt_drop_write_file(file);
4320 return ret;
4321}
4322
4323static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4324{
6d0379ec 4325 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4326 struct btrfs_ioctl_quota_rescan_args *qsa;
4327 int ret = 0;
4328
4329 if (!capable(CAP_SYS_ADMIN))
4330 return -EPERM;
4331
4332 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4333 if (!qsa)
4334 return -ENOMEM;
4335
4336 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4337 qsa->flags = 1;
4338 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4339 }
4340
4341 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4342 ret = -EFAULT;
4343
4344 kfree(qsa);
4345 return ret;
4346}
4347
57254b6e
JS		 4348static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4349{
54563d41 4350 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
57254b6e
JS		 4351
4352 if (!capable(CAP_SYS_ADMIN))
4353 return -EPERM;
4354
4355 return btrfs_qgroup_wait_for_completion(root->fs_info);
4356}
4357
8ea05e3a
AB		 4358static long btrfs_ioctl_set_received_subvol(struct file *file,
4359 void __user *arg)
4360{
4361 struct btrfs_ioctl_received_subvol_args *sa = NULL;
496ad9aa 4362 struct inode *inode = file_inode(file);
8ea05e3a
AB		 4363 struct btrfs_root *root = BTRFS_I(inode)->root;
4364 struct btrfs_root_item *root_item = &root->root_item;
4365 struct btrfs_trans_handle *trans;
4366 struct timespec ct = CURRENT_TIME;
4367 int ret = 0;
dd5f9615 4368 int received_uuid_changed;
8ea05e3a
AB		 4369
4370 ret = mnt_want_write_file(file);
4371 if (ret < 0)
4372 return ret;
4373
4374 down_write(&root->fs_info->subvol_sem);
4375
4376 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4377 ret = -EINVAL;
4378 goto out;
4379 }
4380
4381 if (btrfs_root_readonly(root)) {
4382 ret = -EROFS;
4383 goto out;
4384 }
4385
4386 if (!inode_owner_or_capable(inode)) {
4387 ret = -EACCES;
4388 goto out;
4389 }
4390
4391 sa = memdup_user(arg, sizeof(*sa));
4392 if (IS_ERR(sa)) {
4393 ret = PTR_ERR(sa);
4394 sa = NULL;
4395 goto out;
4396 }
4397
dd5f9615
SB		 4398 /*
4399 * 1 - root item
4400 * 2 - uuid items (received uuid + subvol uuid)
4401 */
4402 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 4403 if (IS_ERR(trans)) {
4404 ret = PTR_ERR(trans);
4405 trans = NULL;
4406 goto out;
4407 }
4408
4409 sa->rtransid = trans->transid;
4410 sa->rtime.sec = ct.tv_sec;
4411 sa->rtime.nsec = ct.tv_nsec;
4412
dd5f9615
SB		 4413 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4414 BTRFS_UUID_SIZE);
4415 if (received_uuid_changed &&
4416 !btrfs_is_empty_uuid(root_item->received_uuid))
4417 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4418 root_item->received_uuid,
4419 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4420 root->root_key.objectid);
8ea05e3a
AB		 4421 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4422 btrfs_set_root_stransid(root_item, sa->stransid);
4423 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 4424 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4425 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4426 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4427 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a
AB		 4428
4429 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4430 &root->root_key, &root->root_item);
4431 if (ret < 0) {
4432 btrfs_end_transaction(trans, root);
8ea05e3a 4433 goto out;
dd5f9615
SB		 4434 }
4435 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4436 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4437 sa->uuid,
4438 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4439 root->root_key.objectid);
4440 if (ret < 0 && ret != -EEXIST) {
4441 btrfs_abort_transaction(trans, root, ret);
8ea05e3a 4442 goto out;
dd5f9615
SB		 4443 }
4444 }
4445 ret = btrfs_commit_transaction(trans, root);
4446 if (ret < 0) {
4447 btrfs_abort_transaction(trans, root, ret);
4448 goto out;
8ea05e3a
AB		 4449 }
4450
4451 ret = copy_to_user(arg, sa, sizeof(*sa));
4452 if (ret)
4453 ret = -EFAULT;
4454
4455out:
4456 kfree(sa);
4457 up_write(&root->fs_info->subvol_sem);
4458 mnt_drop_write_file(file);
4459 return ret;
4460}
4461
867ab667 4462static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4463{
6d0379ec 4464 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a1b83ac5 4465 size_t len;
867ab667 4466 int ret;
a1b83ac5
AJ		 4467 char label[BTRFS_LABEL_SIZE];
4468
4469 spin_lock(&root->fs_info->super_lock);
4470 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4471 spin_unlock(&root->fs_info->super_lock);
4472
4473 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 4474
4475 if (len == BTRFS_LABEL_SIZE) {
efe120a0
FH		 4476 btrfs_warn(root->fs_info,
4477 "label is too long, return the first %zu bytes", --len);
867ab667 4478 }
4479
867ab667 4480 ret = copy_to_user(arg, label, len);
867ab667 4481
4482 return ret ? -EFAULT : 0;
4483}
4484
a8bfd4ab 4485static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4486{
6d0379ec 4487 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a8bfd4ab 4488 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4489 struct btrfs_trans_handle *trans;
4490 char label[BTRFS_LABEL_SIZE];
4491 int ret;
4492
4493 if (!capable(CAP_SYS_ADMIN))
4494 return -EPERM;
4495
4496 if (copy_from_user(label, arg, sizeof(label)))
4497 return -EFAULT;
4498
4499 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
efe120a0 4500 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
a8bfd4ab 4501 BTRFS_LABEL_SIZE - 1);
4502 return -EINVAL;
4503 }
4504
4505 ret = mnt_want_write_file(file);
4506 if (ret)
4507 return ret;
4508
a8bfd4ab 4509 trans = btrfs_start_transaction(root, 0);
4510 if (IS_ERR(trans)) {
4511 ret = PTR_ERR(trans);
4512 goto out_unlock;
4513 }
4514
a1b83ac5 4515 spin_lock(&root->fs_info->super_lock);
a8bfd4ab 4516 strcpy(super_block->label, label);
a1b83ac5 4517 spin_unlock(&root->fs_info->super_lock);
a8bfd4ab 4518 ret = btrfs_end_transaction(trans, root);
4519
4520out_unlock:
a8bfd4ab 4521 mnt_drop_write_file(file);
4522 return ret;
4523}
4524
2eaa055f
JM		 4525#define INIT_FEATURE_FLAGS(suffix) \
4526 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
4527 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
4528 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
4529
4530static int btrfs_ioctl_get_supported_features(struct file *file,
4531 void __user *arg)
4532{
4533 static struct btrfs_ioctl_feature_flags features[3] = {
4534 INIT_FEATURE_FLAGS(SUPP),
4535 INIT_FEATURE_FLAGS(SAFE_SET),
4536 INIT_FEATURE_FLAGS(SAFE_CLEAR)
4537 };
4538
4539 if (copy_to_user(arg, &features, sizeof(features)))
4540 return -EFAULT;
4541
4542 return 0;
4543}
4544
4545static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
4546{
4547 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4548 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4549 struct btrfs_ioctl_feature_flags features;
4550
4551 features.compat_flags = btrfs_super_compat_flags(super_block);
4552 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
4553 features.incompat_flags = btrfs_super_incompat_flags(super_block);
4554
4555 if (copy_to_user(arg, &features, sizeof(features)))
4556 return -EFAULT;
4557
4558 return 0;
4559}
4560
3b02a68a
JM		 4561static int check_feature_bits(struct btrfs_root *root,
4562 enum btrfs_feature_set set,
2eaa055f
JM		 4563 u64 change_mask, u64 flags, u64 supported_flags,
4564 u64 safe_set, u64 safe_clear)
4565{
3b02a68a
JM		 4566 const char *type = btrfs_feature_set_names[set];
4567 char *names;
2eaa055f
JM		 4568 u64 disallowed, unsupported;
4569 u64 set_mask = flags & change_mask;
4570 u64 clear_mask = ~flags & change_mask;
4571
4572 unsupported = set_mask & ~supported_flags;
4573 if (unsupported) {
3b02a68a
JM		 4574 names = btrfs_printable_features(set, unsupported);
4575 if (names) {
4576 btrfs_warn(root->fs_info,
4577 "this kernel does not support the %s feature bit%s",
4578 names, strchr(names, ',') ? "s" : "");
4579 kfree(names);
4580 } else
4581 btrfs_warn(root->fs_info,
2eaa055f
JM		 4582 "this kernel does not support %s bits 0x%llx",
4583 type, unsupported);
4584 return -EOPNOTSUPP;
4585 }
4586
4587 disallowed = set_mask & ~safe_set;
4588 if (disallowed) {
3b02a68a
JM		 4589 names = btrfs_printable_features(set, disallowed);
4590 if (names) {
4591 btrfs_warn(root->fs_info,
4592 "can't set the %s feature bit%s while mounted",
4593 names, strchr(names, ',') ? "s" : "");
4594 kfree(names);
4595 } else
4596 btrfs_warn(root->fs_info,
2eaa055f
JM		 4597 "can't set %s bits 0x%llx while mounted",
4598 type, disallowed);
4599 return -EPERM;
4600 }
4601
4602 disallowed = clear_mask & ~safe_clear;
4603 if (disallowed) {
3b02a68a
JM		 4604 names = btrfs_printable_features(set, disallowed);
4605 if (names) {
4606 btrfs_warn(root->fs_info,
4607 "can't clear the %s feature bit%s while mounted",
4608 names, strchr(names, ',') ? "s" : "");
4609 kfree(names);
4610 } else
4611 btrfs_warn(root->fs_info,
2eaa055f
JM		 4612 "can't clear %s bits 0x%llx while mounted",
4613 type, disallowed);
4614 return -EPERM;
4615 }
4616
4617 return 0;
4618}
4619
4620#define check_feature(root, change_mask, flags, mask_base) \
3b02a68a 4621check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
2eaa055f
JM		 4622 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
4623 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
4624 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
4625
4626static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
4627{
4628 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4629 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4630 struct btrfs_ioctl_feature_flags flags[2];
4631 struct btrfs_trans_handle *trans;
4632 u64 newflags;
4633 int ret;
4634
4635 if (!capable(CAP_SYS_ADMIN))
4636 return -EPERM;
4637
4638 if (copy_from_user(flags, arg, sizeof(flags)))
4639 return -EFAULT;
4640
4641 /* Nothing to do */
4642 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
4643 !flags[0].incompat_flags)
4644 return 0;
4645
4646 ret = check_feature(root, flags[0].compat_flags,
4647 flags[1].compat_flags, COMPAT);
4648 if (ret)
4649 return ret;
4650
4651 ret = check_feature(root, flags[0].compat_ro_flags,
4652 flags[1].compat_ro_flags, COMPAT_RO);
4653 if (ret)
4654 return ret;
4655
4656 ret = check_feature(root, flags[0].incompat_flags,
4657 flags[1].incompat_flags, INCOMPAT);
4658 if (ret)
4659 return ret;
4660
4661 trans = btrfs_start_transaction(root, 1);
4662 if (IS_ERR(trans))
4663 return PTR_ERR(trans);
4664
4665 spin_lock(&root->fs_info->super_lock);
4666 newflags = btrfs_super_compat_flags(super_block);
4667 newflags |= flags[0].compat_flags & flags[1].compat_flags;
4668 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
4669 btrfs_set_super_compat_flags(super_block, newflags);
4670
4671 newflags = btrfs_super_compat_ro_flags(super_block);
4672 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
4673 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
4674 btrfs_set_super_compat_ro_flags(super_block, newflags);
4675
4676 newflags = btrfs_super_incompat_flags(super_block);
4677 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
4678 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
4679 btrfs_set_super_incompat_flags(super_block, newflags);
4680 spin_unlock(&root->fs_info->super_lock);
4681
4682 return btrfs_end_transaction(trans, root);
4683}
4684
f46b5a66
CH		 4685long btrfs_ioctl(struct file *file, unsigned int
4686 cmd, unsigned long arg)
4687{
496ad9aa 4688 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4bcabaa3 4689 void __user *argp = (void __user *)arg;
f46b5a66
CH		 4690
4691 switch (cmd) {
6cbff00f
CH		 4692 case FS_IOC_GETFLAGS:
4693 return btrfs_ioctl_getflags(file, argp);
4694 case FS_IOC_SETFLAGS:
4695 return btrfs_ioctl_setflags(file, argp);
4696 case FS_IOC_GETVERSION:
4697 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 4698 case FITRIM:
4699 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 4700 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 4701 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 4702 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 4703 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 4704 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 4705 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 4706 case BTRFS_IOC_SUBVOL_CREATE_V2:
4707 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 4708 case BTRFS_IOC_SNAP_DESTROY:
4709 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 4710 case BTRFS_IOC_SUBVOL_GETFLAGS:
4711 return btrfs_ioctl_subvol_getflags(file, argp);
4712 case BTRFS_IOC_SUBVOL_SETFLAGS:
4713 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 4714 case BTRFS_IOC_DEFAULT_SUBVOL:
4715 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 4716 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 4717 return btrfs_ioctl_defrag(file, NULL);
4718 case BTRFS_IOC_DEFRAG_RANGE:
4719 return btrfs_ioctl_defrag(file, argp);
f46b5a66 4720 case BTRFS_IOC_RESIZE:
198605a8 4721 return btrfs_ioctl_resize(file, argp);
f46b5a66 4722 case BTRFS_IOC_ADD_DEV:
4bcabaa3 4723 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 4724 case BTRFS_IOC_RM_DEV:
da24927b 4725 return btrfs_ioctl_rm_dev(file, argp);
475f6387
JS		 4726 case BTRFS_IOC_FS_INFO:
4727 return btrfs_ioctl_fs_info(root, argp);
4728 case BTRFS_IOC_DEV_INFO:
4729 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 4730 case BTRFS_IOC_BALANCE:
9ba1f6e4 4731 return btrfs_ioctl_balance(file, NULL);
f46b5a66 4732 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 4733 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4734 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 4735 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 4736 case BTRFS_IOC_TRANS_START:
4737 return btrfs_ioctl_trans_start(file);
4738 case BTRFS_IOC_TRANS_END:
4739 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 4740 case BTRFS_IOC_TREE_SEARCH:
4741 return btrfs_ioctl_tree_search(file, argp);
4742 case BTRFS_IOC_INO_LOOKUP:
4743 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 4744 case BTRFS_IOC_INO_PATHS:
4745 return btrfs_ioctl_ino_to_path(root, argp);
4746 case BTRFS_IOC_LOGICAL_INO:
4747 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 4748 case BTRFS_IOC_SPACE_INFO:
4749 return btrfs_ioctl_space_info(root, argp);
01e219e8
JM		 4750 case BTRFS_IOC_GLOBAL_RSV:
4751 return btrfs_ioctl_global_rsv(root, argp);
9b199859
FDBM		 4752 case BTRFS_IOC_SYNC: {
4753 int ret;
4754
91aef86f 4755 ret = btrfs_start_delalloc_roots(root->fs_info, 0);
9b199859
FDBM		 4756 if (ret)
4757 return ret;
4758 ret = btrfs_sync_fs(file->f_dentry->d_sb, 1);
4759 return ret;
4760 }
46204592 4761 case BTRFS_IOC_START_SYNC:
9a8c28be 4762 return btrfs_ioctl_start_sync(root, argp);
46204592 4763 case BTRFS_IOC_WAIT_SYNC:
9a8c28be 4764 return btrfs_ioctl_wait_sync(root, argp);
475f6387 4765 case BTRFS_IOC_SCRUB:
b8e95489 4766 return btrfs_ioctl_scrub(file, argp);
475f6387
JS		 4767 case BTRFS_IOC_SCRUB_CANCEL:
4768 return btrfs_ioctl_scrub_cancel(root, argp);
4769 case BTRFS_IOC_SCRUB_PROGRESS:
4770 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 4771 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 4772 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 4773 case BTRFS_IOC_BALANCE_CTL:
4774 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 4775 case BTRFS_IOC_BALANCE_PROGRESS:
4776 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 4777 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4778 return btrfs_ioctl_set_received_subvol(file, argp);
31db9f7c
AB		 4779 case BTRFS_IOC_SEND:
4780 return btrfs_ioctl_send(file, argp);
c11d2c23 4781 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 4782 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b 4783 case BTRFS_IOC_QUOTA_CTL:
905b0dda 4784 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 4785 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 4786 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 4787 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 4788 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 4789 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 4790 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 4791 case BTRFS_IOC_QUOTA_RESCAN:
4792 return btrfs_ioctl_quota_rescan(file, argp);
4793 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4794 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 4795 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4796 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd
SB		 4797 case BTRFS_IOC_DEV_REPLACE:
4798 return btrfs_ioctl_dev_replace(root, argp);
867ab667 4799 case BTRFS_IOC_GET_FSLABEL:
4800 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 4801 case BTRFS_IOC_SET_FSLABEL:
4802 return btrfs_ioctl_set_fslabel(file, argp);
416161db
MF		 4803 case BTRFS_IOC_FILE_EXTENT_SAME:
4804 return btrfs_ioctl_file_extent_same(file, argp);
2eaa055f
JM		 4805 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
4806 return btrfs_ioctl_get_supported_features(file, argp);
4807 case BTRFS_IOC_GET_FEATURES:
4808 return btrfs_ioctl_get_features(file, argp);
4809 case BTRFS_IOC_SET_FEATURES:
4810 return btrfs_ioctl_set_features(file, argp);
f46b5a66
CH		 4811 }
4812
4813 return -ENOTTY;
4814}
Linux 6.x block layer and io_uring tree(s)