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Merge tag 'v3.10.108' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
4b4e25f2 46#include "compat.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"
f46b5a66 59
6cbff00f
CH		 60/* Mask out flags that are inappropriate for the given type of inode. */
61static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
62{
63 if (S_ISDIR(mode))
64 return flags;
65 else if (S_ISREG(mode))
66 return flags & ~FS_DIRSYNC_FL;
67 else
68 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
69}
70
71/*
72 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
73 */
74static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
75{
76 unsigned int iflags = 0;
77
78 if (flags & BTRFS_INODE_SYNC)
79 iflags |= FS_SYNC_FL;
80 if (flags & BTRFS_INODE_IMMUTABLE)
81 iflags |= FS_IMMUTABLE_FL;
82 if (flags & BTRFS_INODE_APPEND)
83 iflags |= FS_APPEND_FL;
84 if (flags & BTRFS_INODE_NODUMP)
85 iflags |= FS_NODUMP_FL;
86 if (flags & BTRFS_INODE_NOATIME)
87 iflags |= FS_NOATIME_FL;
88 if (flags & BTRFS_INODE_DIRSYNC)
89 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 90 if (flags & BTRFS_INODE_NODATACOW)
91 iflags |= FS_NOCOW_FL;
92
93 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
94 iflags |= FS_COMPR_FL;
95 else if (flags & BTRFS_INODE_NOCOMPRESS)
96 iflags |= FS_NOCOMP_FL;
6cbff00f
CH		 97
98 return iflags;
99}
100
101/*
102 * Update inode->i_flags based on the btrfs internal flags.
103 */
104void btrfs_update_iflags(struct inode *inode)
105{
106 struct btrfs_inode *ip = BTRFS_I(inode);
107
108 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
109
110 if (ip->flags & BTRFS_INODE_SYNC)
111 inode->i_flags |= S_SYNC;
112 if (ip->flags & BTRFS_INODE_IMMUTABLE)
113 inode->i_flags |= S_IMMUTABLE;
114 if (ip->flags & BTRFS_INODE_APPEND)
115 inode->i_flags |= S_APPEND;
116 if (ip->flags & BTRFS_INODE_NOATIME)
117 inode->i_flags |= S_NOATIME;
118 if (ip->flags & BTRFS_INODE_DIRSYNC)
119 inode->i_flags |= S_DIRSYNC;
120}
121
122/*
123 * Inherit flags from the parent inode.
124 *
e27425d6 125 * Currently only the compression flags and the cow flags are inherited.
6cbff00f
CH		 126 */
127void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
128{
0b4dcea5
CM		 129 unsigned int flags;
130
131 if (!dir)
132 return;
133
134 flags = BTRFS_I(dir)->flags;
6cbff00f 135
e27425d6
JB		 136 if (flags & BTRFS_INODE_NOCOMPRESS) {
137 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
138 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
139 } else if (flags & BTRFS_INODE_COMPRESS) {
140 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
141 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
142 }
143
213490b3 144 if (flags & BTRFS_INODE_NODATACOW) {
e27425d6 145 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
213490b3
LB		 146 if (S_ISREG(inode->i_mode))
147 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
148 }
6cbff00f 149
6cbff00f
CH		 150 btrfs_update_iflags(inode);
151}
152
153static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
154{
496ad9aa 155 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
6cbff00f
CH		 156 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
157
158 if (copy_to_user(arg, &flags, sizeof(flags)))
159 return -EFAULT;
160 return 0;
161}
162
75e7cb7f
LB		 163static int check_flags(unsigned int flags)
164{
165 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
166 FS_NOATIME_FL | FS_NODUMP_FL | \
167 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 168 FS_NOCOMP_FL | FS_COMPR_FL |
169 FS_NOCOW_FL))
75e7cb7f
LB		 170 return -EOPNOTSUPP;
171
172 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
173 return -EINVAL;
174
75e7cb7f
LB		 175 return 0;
176}
177
6cbff00f
CH		 178static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
179{
496ad9aa 180 struct inode *inode = file_inode(file);
6cbff00f
CH		 181 struct btrfs_inode *ip = BTRFS_I(inode);
182 struct btrfs_root *root = ip->root;
183 struct btrfs_trans_handle *trans;
184 unsigned int flags, oldflags;
185 int ret;
f062abf0
LZ		 186 u64 ip_oldflags;
187 unsigned int i_oldflags;
7e97b8da 188 umode_t mode;
6cbff00f 189
b83cc969
LZ		 190 if (btrfs_root_readonly(root))
191 return -EROFS;
192
6cbff00f
CH		 193 if (copy_from_user(&flags, arg, sizeof(flags)))
194 return -EFAULT;
195
75e7cb7f
LB		 196 ret = check_flags(flags);
197 if (ret)
198 return ret;
f46b5a66 199
2e149670 200 if (!inode_owner_or_capable(inode))
6cbff00f
CH		 201 return -EACCES;
202
e7848683
JK		 203 ret = mnt_want_write_file(file);
204 if (ret)
205 return ret;
206
6cbff00f
CH		 207 mutex_lock(&inode->i_mutex);
208
f062abf0
LZ		 209 ip_oldflags = ip->flags;
210 i_oldflags = inode->i_flags;
7e97b8da 211 mode = inode->i_mode;
f062abf0 212
6cbff00f
CH		 213 flags = btrfs_mask_flags(inode->i_mode, flags);
214 oldflags = btrfs_flags_to_ioctl(ip->flags);
215 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
216 if (!capable(CAP_LINUX_IMMUTABLE)) {
217 ret = -EPERM;
218 goto out_unlock;
219 }
220 }
221
6cbff00f
CH		 222 if (flags & FS_SYNC_FL)
223 ip->flags |= BTRFS_INODE_SYNC;
224 else
225 ip->flags &= ~BTRFS_INODE_SYNC;
226 if (flags & FS_IMMUTABLE_FL)
227 ip->flags |= BTRFS_INODE_IMMUTABLE;
228 else
229 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
230 if (flags & FS_APPEND_FL)
231 ip->flags |= BTRFS_INODE_APPEND;
232 else
233 ip->flags &= ~BTRFS_INODE_APPEND;
234 if (flags & FS_NODUMP_FL)
235 ip->flags |= BTRFS_INODE_NODUMP;
236 else
237 ip->flags &= ~BTRFS_INODE_NODUMP;
238 if (flags & FS_NOATIME_FL)
239 ip->flags |= BTRFS_INODE_NOATIME;
240 else
241 ip->flags &= ~BTRFS_INODE_NOATIME;
242 if (flags & FS_DIRSYNC_FL)
243 ip->flags |= BTRFS_INODE_DIRSYNC;
244 else
245 ip->flags &= ~BTRFS_INODE_DIRSYNC;
7e97b8da
DS		 246 if (flags & FS_NOCOW_FL) {
247 if (S_ISREG(mode)) {
248 /*
249 * It's safe to turn csums off here, no extents exist.
250 * Otherwise we want the flag to reflect the real COW
251 * status of the file and will not set it.
252 */
253 if (inode->i_size == 0)
254 ip->flags |= BTRFS_INODE_NODATACOW
255 | BTRFS_INODE_NODATASUM;
256 } else {
257 ip->flags |= BTRFS_INODE_NODATACOW;
258 }
259 } else {
260 /*
261 * Revert back under same assuptions as above
262 */
263 if (S_ISREG(mode)) {
264 if (inode->i_size == 0)
265 ip->flags &= ~(BTRFS_INODE_NODATACOW
266 | BTRFS_INODE_NODATASUM);
267 } else {
268 ip->flags &= ~BTRFS_INODE_NODATACOW;
269 }
270 }
6cbff00f 271
75e7cb7f
LB		 272 /*
273 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
274 * flag may be changed automatically if compression code won't make
275 * things smaller.
276 */
277 if (flags & FS_NOCOMP_FL) {
278 ip->flags &= ~BTRFS_INODE_COMPRESS;
279 ip->flags |= BTRFS_INODE_NOCOMPRESS;
280 } else if (flags & FS_COMPR_FL) {
281 ip->flags |= BTRFS_INODE_COMPRESS;
282 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
ebcb904d
LZ		 283 } else {
284 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 285 }
6cbff00f 286
4da6f1a3 287 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 288 if (IS_ERR(trans)) {
289 ret = PTR_ERR(trans);
290 goto out_drop;
291 }
6cbff00f 292
306424cc 293 btrfs_update_iflags(inode);
0c4d2d95 294 inode_inc_iversion(inode);
306424cc 295 inode->i_ctime = CURRENT_TIME;
6cbff00f 296 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 297
6cbff00f 298 btrfs_end_transaction(trans, root);
f062abf0
LZ		 299 out_drop:
300 if (ret) {
301 ip->flags = ip_oldflags;
302 inode->i_flags = i_oldflags;
303 }
6cbff00f 304
6cbff00f
CH		 305 out_unlock:
306 mutex_unlock(&inode->i_mutex);
e7848683 307 mnt_drop_write_file(file);
2d4e6f6a 308 return ret;
6cbff00f
CH		 309}
310
311static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
312{
496ad9aa 313 struct inode *inode = file_inode(file);
6cbff00f
CH		 314
315 return put_user(inode->i_generation, arg);
316}
f46b5a66 317
f7039b1d
LD		 318static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
319{
815745cf 320 struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
f7039b1d
LD		 321 struct btrfs_device *device;
322 struct request_queue *q;
323 struct fstrim_range range;
324 u64 minlen = ULLONG_MAX;
325 u64 num_devices = 0;
815745cf 326 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
f7039b1d
LD		 327 int ret;
328
329 if (!capable(CAP_SYS_ADMIN))
330 return -EPERM;
331
1f78160c
XG		 332 rcu_read_lock();
333 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
334 dev_list) {
f7039b1d
LD		 335 if (!device->bdev)
336 continue;
337 q = bdev_get_queue(device->bdev);
338 if (blk_queue_discard(q)) {
339 num_devices++;
340 minlen = min((u64)q->limits.discard_granularity,
341 minlen);
342 }
343 }
1f78160c 344 rcu_read_unlock();
f4c697e6 345
f7039b1d
LD		 346 if (!num_devices)
347 return -EOPNOTSUPP;
f7039b1d
LD		 348 if (copy_from_user(&range, arg, sizeof(range)))
349 return -EFAULT;
e515c18b
LC		 350 if (range.start > total_bytes ||
351 range.len < fs_info->sb->s_blocksize)
f4c697e6 352 return -EINVAL;
f7039b1d 353
f4c697e6 354 range.len = min(range.len, total_bytes - range.start);
f7039b1d 355 range.minlen = max(range.minlen, minlen);
815745cf 356 ret = btrfs_trim_fs(fs_info->tree_root, &range);
f7039b1d
LD		 357 if (ret < 0)
358 return ret;
359
360 if (copy_to_user(arg, &range, sizeof(range)))
361 return -EFAULT;
362
363 return 0;
364}
365
d5c12070 366static noinline int create_subvol(struct inode *dir,
cb8e7090 367 struct dentry *dentry,
72fd032e 368 char *name, int namelen,
6f72c7e2 369 u64 *async_transid,
8696c533 370 struct btrfs_qgroup_inherit *inherit)
f46b5a66
CH		 371{
372 struct btrfs_trans_handle *trans;
373 struct btrfs_key key;
374 struct btrfs_root_item root_item;
375 struct btrfs_inode_item *inode_item;
376 struct extent_buffer *leaf;
d5c12070 377 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 378 struct btrfs_root *new_root;
d5c12070 379 struct btrfs_block_rsv block_rsv;
8ea05e3a 380 struct timespec cur_time = CURRENT_TIME;
f46b5a66
CH		 381 int ret;
382 int err;
383 u64 objectid;
384 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 385 u64 index = 0;
d5c12070 386 u64 qgroup_reserved;
8ea05e3a 387 uuid_le new_uuid;
f46b5a66 388
581bb050 389 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
2fbe8c8a 390 if (ret)
a22285a6 391 return ret;
6a912213 392
d5c12070 393 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 394 /*
d5c12070
MX		 395 * The same as the snapshot creation, please see the comment
396 * of create_snapshot().
9ed74f2d 397 */
d5c12070
MX		 398 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
399 7, &qgroup_reserved);
400 if (ret)
401 return ret;
402
403 trans = btrfs_start_transaction(root, 0);
404 if (IS_ERR(trans)) {
405 ret = PTR_ERR(trans);
406 goto out;
407 }
408 trans->block_rsv = &block_rsv;
409 trans->bytes_reserved = block_rsv.size;
f46b5a66 410
8696c533 411 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
6f72c7e2
AJ		 412 if (ret)
413 goto fail;
414
5d4f98a2 415 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
5581a51a 416 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 417 if (IS_ERR(leaf)) {
418 ret = PTR_ERR(leaf);
419 goto fail;
420 }
f46b5a66 421
5d4f98a2 422 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
f46b5a66
CH		 423 btrfs_set_header_bytenr(leaf, leaf->start);
424 btrfs_set_header_generation(leaf, trans->transid);
5d4f98a2 425 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
f46b5a66
CH		 426 btrfs_set_header_owner(leaf, objectid);
427
428 write_extent_buffer(leaf, root->fs_info->fsid,
429 (unsigned long)btrfs_header_fsid(leaf),
430 BTRFS_FSID_SIZE);
5d4f98a2
YZ		 431 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
432 (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
433 BTRFS_UUID_SIZE);
f46b5a66
CH		 434 btrfs_mark_buffer_dirty(leaf);
435
8ea05e3a
AB		 436 memset(&root_item, 0, sizeof(root_item));
437
f46b5a66 438 inode_item = &root_item.inode;
f46b5a66
CH		 439 inode_item->generation = cpu_to_le64(1);
440 inode_item->size = cpu_to_le64(3);
441 inode_item->nlink = cpu_to_le32(1);
a76a3cd4 442 inode_item->nbytes = cpu_to_le64(root->leafsize);
f46b5a66
CH		 443 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
444
08fe4db1
LZ		 445 root_item.flags = 0;
446 root_item.byte_limit = 0;
447 inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
448
f46b5a66 449 btrfs_set_root_bytenr(&root_item, leaf->start);
84234f3a 450 btrfs_set_root_generation(&root_item, trans->transid);
f46b5a66
CH		 451 btrfs_set_root_level(&root_item, 0);
452 btrfs_set_root_refs(&root_item, 1);
86b9f2ec 453 btrfs_set_root_used(&root_item, leaf->len);
80ff3856 454 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66 455
8ea05e3a
AB		 456 btrfs_set_root_generation_v2(&root_item,
457 btrfs_root_generation(&root_item));
458 uuid_le_gen(&new_uuid);
459 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
460 root_item.otime.sec = cpu_to_le64(cur_time.tv_sec);
dadd1105 461 root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec);
8ea05e3a
AB		 462 root_item.ctime = root_item.otime;
463 btrfs_set_root_ctransid(&root_item, trans->transid);
464 btrfs_set_root_otransid(&root_item, trans->transid);
f46b5a66 465
925baedd 466 btrfs_tree_unlock(leaf);
f46b5a66
CH		 467 free_extent_buffer(leaf);
468 leaf = NULL;
469
470 btrfs_set_root_dirid(&root_item, new_dirid);
471
472 key.objectid = objectid;
5d4f98a2 473 key.offset = 0;
f46b5a66
CH		 474 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
475 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
476 &root_item);
477 if (ret)
478 goto fail;
479
76dda93c
YZ		 480 key.offset = (u64)-1;
481 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
79787eaa
JM		 482 if (IS_ERR(new_root)) {
483 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
484 ret = PTR_ERR(new_root);
485 goto fail;
486 }
76dda93c
YZ		 487
488 btrfs_record_root_in_trans(trans, new_root);
489
d82a6f1d 490 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
ce598979
MF		 491 if (ret) {
492 /* We potentially lose an unused inode item here */
79787eaa 493 btrfs_abort_transaction(trans, root, ret);
ce598979
MF		 494 goto fail;
495 }
496
f46b5a66
CH		 497 /*
498 * insert the directory item
499 */
3de4586c 500 ret = btrfs_set_inode_index(dir, &index);
79787eaa
JM		 501 if (ret) {
502 btrfs_abort_transaction(trans, root, ret);
503 goto fail;
504 }
3de4586c
CM		 505
506 ret = btrfs_insert_dir_item(trans, root,
16cdcec7 507 name, namelen, dir, &key,
3de4586c 508 BTRFS_FT_DIR, index);
79787eaa
JM		 509 if (ret) {
510 btrfs_abort_transaction(trans, root, ret);
f46b5a66 511 goto fail;
79787eaa 512 }
0660b5af 513
52c26179
YZ		 514 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
515 ret = btrfs_update_inode(trans, root, dir);
516 BUG_ON(ret);
517
0660b5af 518 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4df27c4d 519 objectid, root->root_key.objectid,
33345d01 520 btrfs_ino(dir), index, name, namelen);
0660b5af 521
76dda93c 522 BUG_ON(ret);
f46b5a66 523
f46b5a66 524fail:
d5c12070
MX		 525 trans->block_rsv = NULL;
526 trans->bytes_reserved = 0;
72fd032e
SW		 527 if (async_transid) {
528 *async_transid = trans->transid;
529 err = btrfs_commit_transaction_async(trans, root, 1);
00d71c9c
MX		 530 if (err)
531 err = btrfs_commit_transaction(trans, root);
72fd032e
SW		 532 } else {
533 err = btrfs_commit_transaction(trans, root);
534 }
f46b5a66
CH		 535 if (err && !ret)
536 ret = err;
1a65e24b
CM		 537
538 if (!ret)
539 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
d5c12070
MX		 540out:
541 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
f46b5a66
CH		 542 return ret;
543}
544
e9662f70
MX		 545static int create_snapshot(struct btrfs_root *root, struct inode *dir,
546 struct dentry *dentry, char *name, int namelen,
547 u64 *async_transid, bool readonly,
548 struct btrfs_qgroup_inherit *inherit)
f46b5a66 549{
2e4bfab9 550 struct inode *inode;
f46b5a66
CH		 551 struct btrfs_pending_snapshot *pending_snapshot;
552 struct btrfs_trans_handle *trans;
2e4bfab9 553 int ret;
f46b5a66
CH		 554
555 if (!root->ref_cows)
556 return -EINVAL;
557
3de4586c 558 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
a22285a6
YZ		 559 if (!pending_snapshot)
560 return -ENOMEM;
561
66d8f3dd
MX		 562 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
563 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 564 /*
565 * 1 - parent dir inode
566 * 2 - dir entries
567 * 1 - root item
568 * 2 - root ref/backref
569 * 1 - root of snapshot
570 */
571 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
572 &pending_snapshot->block_rsv, 7,
573 &pending_snapshot->qgroup_reserved);
574 if (ret)
575 goto out;
576
3de4586c 577 pending_snapshot->dentry = dentry;
f46b5a66 578 pending_snapshot->root = root;
b83cc969 579 pending_snapshot->readonly = readonly;
e9662f70 580 pending_snapshot->dir = dir;
8696c533 581 pending_snapshot->inherit = inherit;
a22285a6 582
d5c12070 583 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 584 if (IS_ERR(trans)) {
585 ret = PTR_ERR(trans);
586 goto fail;
587 }
588
8351583e 589 spin_lock(&root->fs_info->trans_lock);
f46b5a66
CH		 590 list_add(&pending_snapshot->list,
591 &trans->transaction->pending_snapshots);
8351583e 592 spin_unlock(&root->fs_info->trans_lock);
72fd032e
SW		 593 if (async_transid) {
594 *async_transid = trans->transid;
595 ret = btrfs_commit_transaction_async(trans,
596 root->fs_info->extent_root, 1);
00d71c9c
MX		 597 if (ret)
598 ret = btrfs_commit_transaction(trans, root);
72fd032e
SW		 599 } else {
600 ret = btrfs_commit_transaction(trans,
601 root->fs_info->extent_root);
602 }
aec8030a 603 if (ret)
c37b2b62 604 goto fail;
a22285a6
YZ		 605
606 ret = pending_snapshot->error;
607 if (ret)
608 goto fail;
609
66b4ffd1
JB		 610 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
611 if (ret)
612 goto fail;
f46b5a66 613
2fbe8c8a 614 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 615 if (IS_ERR(inode)) {
616 ret = PTR_ERR(inode);
617 goto fail;
618 }
619 BUG_ON(!inode);
620 d_instantiate(dentry, inode);
621 ret = 0;
622fail:
d5c12070
MX		 623 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
624 &pending_snapshot->block_rsv,
625 pending_snapshot->qgroup_reserved);
626out:
a22285a6 627 kfree(pending_snapshot);
f46b5a66
CH		 628 return ret;
629}
630
4260f7c7
SW		 631/* copy of check_sticky in fs/namei.c()
632* It's inline, so penalty for filesystems that don't use sticky bit is
633* minimal.
634*/
635static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
636{
2f2f43d3 637 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 638
639 if (!(dir->i_mode & S_ISVTX))
640 return 0;
2f2f43d3 641 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 642 return 0;
2f2f43d3 643 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 644 return 0;
645 return !capable(CAP_FOWNER);
646}
647
648/* copy of may_delete in fs/namei.c()
649 * Check whether we can remove a link victim from directory dir, check
650 * whether the type of victim is right.
651 * 1. We can't do it if dir is read-only (done in permission())
652 * 2. We should have write and exec permissions on dir
653 * 3. We can't remove anything from append-only dir
654 * 4. We can't do anything with immutable dir (done in permission())
655 * 5. If the sticky bit on dir is set we should either
656 * a. be owner of dir, or
657 * b. be owner of victim, or
658 * c. have CAP_FOWNER capability
659 * 6. If the victim is append-only or immutable we can't do antyhing with
660 * links pointing to it.
661 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
662 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
663 * 9. We can't remove a root or mountpoint.
664 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
665 * nfs_async_unlink().
666 */
667
668static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
669{
670 int error;
671
672 if (!victim->d_inode)
673 return -ENOENT;
674
675 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 676 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 677
678 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
679 if (error)
680 return error;
681 if (IS_APPEND(dir))
682 return -EPERM;
683 if (btrfs_check_sticky(dir, victim->d_inode)||
684 IS_APPEND(victim->d_inode)||
685 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
686 return -EPERM;
687 if (isdir) {
688 if (!S_ISDIR(victim->d_inode->i_mode))
689 return -ENOTDIR;
690 if (IS_ROOT(victim))
691 return -EBUSY;
692 } else if (S_ISDIR(victim->d_inode->i_mode))
693 return -EISDIR;
694 if (IS_DEADDIR(dir))
695 return -ENOENT;
696 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
697 return -EBUSY;
698 return 0;
699}
700
cb8e7090
CH		 701/* copy of may_create in fs/namei.c() */
702static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
703{
704 if (child->d_inode)
705 return -EEXIST;
706 if (IS_DEADDIR(dir))
707 return -ENOENT;
708 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
709}
710
711/*
712 * Create a new subvolume below @parent. This is largely modeled after
713 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
714 * inside this filesystem so it's quite a bit simpler.
715 */
76dda93c
YZ		 716static noinline int btrfs_mksubvol(struct path *parent,
717 char *name, int namelen,
72fd032e 718 struct btrfs_root *snap_src,
6f72c7e2 719 u64 *async_transid, bool readonly,
8696c533 720 struct btrfs_qgroup_inherit *inherit)
cb8e7090 721{
76dda93c 722 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 723 struct dentry *dentry;
724 int error;
725
5c50c9b8
DS		 726 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
727 if (error == -EINTR)
728 return error;
cb8e7090
CH		 729
730 dentry = lookup_one_len(name, parent->dentry, namelen);
731 error = PTR_ERR(dentry);
732 if (IS_ERR(dentry))
733 goto out_unlock;
734
735 error = -EEXIST;
736 if (dentry->d_inode)
737 goto out_dput;
738
76dda93c 739 error = btrfs_may_create(dir, dentry);
cb8e7090 740 if (error)
a874a63e 741 goto out_dput;
cb8e7090 742
9c52057c
CM		 743 /*
744 * even if this name doesn't exist, we may get hash collisions.
745 * check for them now when we can safely fail
746 */
747 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
748 dir->i_ino, name,
749 namelen);
750 if (error)
751 goto out_dput;
752
76dda93c
YZ		 753 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
754
755 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
756 goto out_up_read;
757
3de4586c 758 if (snap_src) {
e9662f70 759 error = create_snapshot(snap_src, dir, dentry, name, namelen,
6f72c7e2 760 async_transid, readonly, inherit);
3de4586c 761 } else {
d5c12070
MX		 762 error = create_subvol(dir, dentry, name, namelen,
763 async_transid, inherit);
3de4586c 764 }
76dda93c
YZ		 765 if (!error)
766 fsnotify_mkdir(dir, dentry);
767out_up_read:
768 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 769out_dput:
770 dput(dentry);
771out_unlock:
76dda93c 772 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 773 return error;
774}
775
4cb5300b
CM		 776/*
777 * When we're defragging a range, we don't want to kick it off again
778 * if it is really just waiting for delalloc to send it down.
779 * If we find a nice big extent or delalloc range for the bytes in the
780 * file you want to defrag, we return 0 to let you know to skip this
781 * part of the file
782 */
783static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
784{
785 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
786 struct extent_map *em = NULL;
787 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
788 u64 end;
789
790 read_lock(&em_tree->lock);
791 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
792 read_unlock(&em_tree->lock);
793
794 if (em) {
795 end = extent_map_end(em);
796 free_extent_map(em);
797 if (end - offset > thresh)
798 return 0;
799 }
800 /* if we already have a nice delalloc here, just stop */
801 thresh /= 2;
802 end = count_range_bits(io_tree, &offset, offset + thresh,
803 thresh, EXTENT_DELALLOC, 1);
804 if (end >= thresh)
805 return 0;
806 return 1;
807}
808
809/*
810 * helper function to walk through a file and find extents
811 * newer than a specific transid, and smaller than thresh.
812 *
813 * This is used by the defragging code to find new and small
814 * extents
815 */
816static int find_new_extents(struct btrfs_root *root,
817 struct inode *inode, u64 newer_than,
818 u64 *off, int thresh)
819{
820 struct btrfs_path *path;
821 struct btrfs_key min_key;
822 struct btrfs_key max_key;
823 struct extent_buffer *leaf;
824 struct btrfs_file_extent_item *extent;
825 int type;
826 int ret;
a4689d2b 827 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 828
829 path = btrfs_alloc_path();
830 if (!path)
831 return -ENOMEM;
832
a4689d2b 833 min_key.objectid = ino;
4cb5300b
CM		 834 min_key.type = BTRFS_EXTENT_DATA_KEY;
835 min_key.offset = *off;
836
a4689d2b 837 max_key.objectid = ino;
4cb5300b
CM		 838 max_key.type = (u8)-1;
839 max_key.offset = (u64)-1;
840
841 path->keep_locks = 1;
842
843 while(1) {
844 ret = btrfs_search_forward(root, &min_key, &max_key,
de78b51a 845 path, newer_than);
4cb5300b
CM		 846 if (ret != 0)
847 goto none;
a4689d2b 848 if (min_key.objectid != ino)
4cb5300b
CM		 849 goto none;
850 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
851 goto none;
852
853 leaf = path->nodes[0];
854 extent = btrfs_item_ptr(leaf, path->slots[0],
855 struct btrfs_file_extent_item);
856
857 type = btrfs_file_extent_type(leaf, extent);
858 if (type == BTRFS_FILE_EXTENT_REG &&
859 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
860 check_defrag_in_cache(inode, min_key.offset, thresh)) {
861 *off = min_key.offset;
862 btrfs_free_path(path);
863 return 0;
864 }
865
866 if (min_key.offset == (u64)-1)
867 goto none;
868
869 min_key.offset++;
870 btrfs_release_path(path);
871 }
872none:
873 btrfs_free_path(path);
874 return -ENOENT;
875}
876
6c282eb4 877static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 878{
879 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 880 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
881 struct extent_map *em;
882 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 883
6c282eb4
LZ		 884 /*
885 * hopefully we have this extent in the tree already, try without
886 * the full extent lock
887 */
17ce6ef8 888 read_lock(&em_tree->lock);
6c282eb4 889 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 890 read_unlock(&em_tree->lock);
891
6c282eb4
LZ		 892 if (!em) {
893 /* get the big lock and read metadata off disk */
894 lock_extent(io_tree, start, start + len - 1);
895 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
896 unlock_extent(io_tree, start, start + len - 1);
897
898 if (IS_ERR(em))
899 return NULL;
900 }
901
902 return em;
903}
17ce6ef8 904
6c282eb4
LZ		 905static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
906{
907 struct extent_map *next;
908 bool ret = true;
909
910 /* this is the last extent */
911 if (em->start + em->len >= i_size_read(inode))
912 return false;
913
914 next = defrag_lookup_extent(inode, em->start + em->len);
915 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
916 ret = false;
917
918 free_extent_map(next);
17ce6ef8
LB		 919 return ret;
920}
921
6c282eb4 922static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 923 u64 *last_len, u64 *skip, u64 *defrag_end,
924 int compress)
940100a4 925{
6c282eb4 926 struct extent_map *em;
940100a4 927 int ret = 1;
6c282eb4 928 bool next_mergeable = true;
940100a4
CM		 929
930 /*
008873ea 931 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 932 * defragging it
933 */
934 if (start < *defrag_end)
935 return 1;
936
937 *skip = 0;
938
6c282eb4
LZ		 939 em = defrag_lookup_extent(inode, start);
940 if (!em)
941 return 0;
940100a4
CM		 942
943 /* this will cover holes, and inline extents */
17ce6ef8 944 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 945 ret = 0;
17ce6ef8
LB		 946 goto out;
947 }
948
6c282eb4 949 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 950
951 /*
6c282eb4
LZ		 952 * we hit a real extent, if it is big or the next extent is not a
953 * real extent, don't bother defragging it
940100a4 954 */
a43a2111 955 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 956 (em->len >= thresh || !next_mergeable))
940100a4 957 ret = 0;
17ce6ef8 958out:
940100a4
CM		 959 /*
960 * last_len ends up being a counter of how many bytes we've defragged.
961 * every time we choose not to defrag an extent, we reset *last_len
962 * so that the next tiny extent will force a defrag.
963 *
964 * The end result of this is that tiny extents before a single big
965 * extent will force at least part of that big extent to be defragged.
966 */
967 if (ret) {
940100a4
CM		 968 *defrag_end = extent_map_end(em);
969 } else {
970 *last_len = 0;
971 *skip = extent_map_end(em);
972 *defrag_end = 0;
973 }
974
975 free_extent_map(em);
976 return ret;
977}
978
4cb5300b
CM		 979/*
980 * it doesn't do much good to defrag one or two pages
981 * at a time. This pulls in a nice chunk of pages
982 * to COW and defrag.
983 *
984 * It also makes sure the delalloc code has enough
985 * dirty data to avoid making new small extents as part
986 * of the defrag
987 *
988 * It's a good idea to start RA on this range
989 * before calling this.
990 */
991static int cluster_pages_for_defrag(struct inode *inode,
992 struct page **pages,
993 unsigned long start_index,
994 int num_pages)
f46b5a66 995{
4cb5300b
CM		 996 unsigned long file_end;
997 u64 isize = i_size_read(inode);
998 u64 page_start;
999 u64 page_end;
1f12bd06 1000 u64 page_cnt;
4cb5300b
CM		 1001 int ret;
1002 int i;
1003 int i_done;
3eaa2885 1004 struct btrfs_ordered_extent *ordered;
4cb5300b 1005 struct extent_state *cached_state = NULL;
600a45e1 1006 struct extent_io_tree *tree;
3b16a4e3 1007 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1008
4cb5300b 1009 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 1010 if (!isize || start_index > file_end)
1011 return 0;
1012
1013 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 1014
1015 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 1016 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1017 if (ret)
1018 return ret;
4cb5300b 1019 i_done = 0;
600a45e1 1020 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1021
1022 /* step one, lock all the pages */
1f12bd06 1023 for (i = 0; i < page_cnt; i++) {
4cb5300b 1024 struct page *page;
600a45e1 1025again:
a94733d0 1026 page = find_or_create_page(inode->i_mapping,
600a45e1 1027 start_index + i, mask);
4cb5300b
CM		 1028 if (!page)
1029 break;
1030
600a45e1
MX		 1031 page_start = page_offset(page);
1032 page_end = page_start + PAGE_CACHE_SIZE - 1;
1033 while (1) {
d0082371 1034 lock_extent(tree, page_start, page_end);
600a45e1
MX		 1035 ordered = btrfs_lookup_ordered_extent(inode,
1036 page_start);
d0082371 1037 unlock_extent(tree, page_start, page_end);
600a45e1
MX		 1038 if (!ordered)
1039 break;
1040
1041 unlock_page(page);
1042 btrfs_start_ordered_extent(inode, ordered, 1);
1043 btrfs_put_ordered_extent(ordered);
1044 lock_page(page);
1f12bd06
LB		 1045 /*
1046 * we unlocked the page above, so we need check if
1047 * it was released or not.
1048 */
1049 if (page->mapping != inode->i_mapping) {
1050 unlock_page(page);
1051 page_cache_release(page);
1052 goto again;
1053 }
600a45e1
MX		 1054 }
1055
4cb5300b
CM		 1056 if (!PageUptodate(page)) {
1057 btrfs_readpage(NULL, page);
1058 lock_page(page);
1059 if (!PageUptodate(page)) {
1060 unlock_page(page);
1061 page_cache_release(page);
1062 ret = -EIO;
1063 break;
1064 }
1065 }
600a45e1 1066
600a45e1
MX		 1067 if (page->mapping != inode->i_mapping) {
1068 unlock_page(page);
1069 page_cache_release(page);
1070 goto again;
1071 }
1072
4cb5300b
CM		 1073 pages[i] = page;
1074 i_done++;
1075 }
1076 if (!i_done || ret)
1077 goto out;
1078
1079 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1080 goto out;
1081
1082 /*
1083 * so now we have a nice long stream of locked
1084 * and up to date pages, lets wait on them
1085 */
1086 for (i = 0; i < i_done; i++)
1087 wait_on_page_writeback(pages[i]);
1088
1089 page_start = page_offset(pages[0]);
1090 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1091
1092 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1093 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1094 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1095 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1096 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1097 &cached_state, GFP_NOFS);
4cb5300b 1098
1f12bd06 1099 if (i_done != page_cnt) {
9e0baf60
JB		 1100 spin_lock(&BTRFS_I(inode)->lock);
1101 BTRFS_I(inode)->outstanding_extents++;
1102 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1103 btrfs_delalloc_release_space(inode,
1f12bd06 1104 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1105 }
1106
1107
9e8a4a8b
LB		 1108 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1109 &cached_state, GFP_NOFS);
4cb5300b
CM		 1110
1111 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1112 page_start, page_end - 1, &cached_state,
1113 GFP_NOFS);
1114
1115 for (i = 0; i < i_done; i++) {
1116 clear_page_dirty_for_io(pages[i]);
1117 ClearPageChecked(pages[i]);
1118 set_page_extent_mapped(pages[i]);
1119 set_page_dirty(pages[i]);
1120 unlock_page(pages[i]);
1121 page_cache_release(pages[i]);
1122 }
1123 return i_done;
1124out:
1125 for (i = 0; i < i_done; i++) {
1126 unlock_page(pages[i]);
1127 page_cache_release(pages[i]);
1128 }
1f12bd06 1129 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1130 return ret;
1131
1132}
1133
1134int btrfs_defrag_file(struct inode *inode, struct file *file,
1135 struct btrfs_ioctl_defrag_range_args *range,
1136 u64 newer_than, unsigned long max_to_defrag)
1137{
1138 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1139 struct file_ra_state *ra = NULL;
f46b5a66 1140 unsigned long last_index;
151a31b2 1141 u64 isize = i_size_read(inode);
940100a4
CM		 1142 u64 last_len = 0;
1143 u64 skip = 0;
1144 u64 defrag_end = 0;
4cb5300b 1145 u64 newer_off = range->start;
f46b5a66 1146 unsigned long i;
008873ea 1147 unsigned long ra_index = 0;
f46b5a66 1148 int ret;
4cb5300b 1149 int defrag_count = 0;
1a419d85 1150 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1151 int extent_thresh = range->extent_thresh;
008873ea
LZ		 1152 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1153 int cluster = max_cluster;
4cb5300b
CM		 1154 u64 new_align = ~((u64)128 * 1024 - 1);
1155 struct page **pages = NULL;
1156
0abd5b17
LB		 1157 if (isize == 0)
1158 return 0;
1159
1160 if (range->start >= isize)
1161 return -EINVAL;
1a419d85
LZ		 1162
1163 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1164 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1165 return -EINVAL;
1166 if (range->compress_type)
1167 compress_type = range->compress_type;
1168 }
f46b5a66 1169
0abd5b17
LB		 1170 if (extent_thresh == 0)
1171 extent_thresh = 256 * 1024;
940100a4 1172
4cb5300b
CM		 1173 /*
1174 * if we were not given a file, allocate a readahead
1175 * context
1176 */
1177 if (!file) {
1178 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1179 if (!ra)
1180 return -ENOMEM;
1181 file_ra_state_init(ra, inode->i_mapping);
1182 } else {
1183 ra = &file->f_ra;
1184 }
1185
008873ea 1186 pages = kmalloc(sizeof(struct page *) * max_cluster,
4cb5300b
CM		 1187 GFP_NOFS);
1188 if (!pages) {
1189 ret = -ENOMEM;
1190 goto out_ra;
1191 }
1192
1193 /* find the last page to defrag */
1e701a32 1194 if (range->start + range->len > range->start) {
151a31b2 1195 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1196 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1197 } else {
151a31b2 1198 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1199 }
1200
4cb5300b
CM		 1201 if (newer_than) {
1202 ret = find_new_extents(root, inode, newer_than,
1203 &newer_off, 64 * 1024);
1204 if (!ret) {
1205 range->start = newer_off;
1206 /*
1207 * we always align our defrag to help keep
1208 * the extents in the file evenly spaced
1209 */
1210 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1211 } else
1212 goto out_ra;
1213 } else {
1214 i = range->start >> PAGE_CACHE_SHIFT;
1215 }
1216 if (!max_to_defrag)
7ec31b54 1217 max_to_defrag = last_index + 1;
4cb5300b 1218
2a0f7f57
LZ		 1219 /*
1220 * make writeback starts from i, so the defrag range can be
1221 * written sequentially.
1222 */
1223 if (i < inode->i_mapping->writeback_index)
1224 inode->i_mapping->writeback_index = i;
1225
f7f43cc8
CM		 1226 while (i <= last_index && defrag_count < max_to_defrag &&
1227 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1228 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1229 /*
1230 * make sure we stop running if someone unmounts
1231 * the FS
1232 */
1233 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1234 break;
1235
210549eb
DS		 1236 if (btrfs_defrag_cancelled(root->fs_info)) {
1237 printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
1238 ret = -EAGAIN;
1239 break;
1240 }
1241
66c26892 1242 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1243 extent_thresh, &last_len, &skip,
a43a2111
AM		 1244 &defrag_end, range->flags &
1245 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1246 unsigned long next;
1247 /*
1248 * the should_defrag function tells us how much to skip
1249 * bump our counter by the suggested amount
1250 */
1251 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1252 i = max(i + 1, next);
1253 continue;
1254 }
008873ea
LZ		 1255
1256 if (!newer_than) {
1257 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1258 PAGE_CACHE_SHIFT) - i;
1259 cluster = min(cluster, max_cluster);
1260 } else {
1261 cluster = max_cluster;
1262 }
1263
1e701a32 1264 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1a419d85 1265 BTRFS_I(inode)->force_compress = compress_type;
940100a4 1266
008873ea
LZ		 1267 if (i + cluster > ra_index) {
1268 ra_index = max(i, ra_index);
1269 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1270 cluster);
1271 ra_index += max_cluster;
1272 }
940100a4 1273
ecb8bea8 1274 mutex_lock(&inode->i_mutex);
008873ea 1275 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1276 if (ret < 0) {
1277 mutex_unlock(&inode->i_mutex);
4cb5300b 1278 goto out_ra;
ecb8bea8 1279 }
4cb5300b
CM		 1280
1281 defrag_count += ret;
d0e1d66b 1282 balance_dirty_pages_ratelimited(inode->i_mapping);
ecb8bea8 1283 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1284
1285 if (newer_than) {
1286 if (newer_off == (u64)-1)
1287 break;
1288
e1f041e1
LB		 1289 if (ret > 0)
1290 i += ret;
1291
4cb5300b
CM		 1292 newer_off = max(newer_off + 1,
1293 (u64)i << PAGE_CACHE_SHIFT);
1294
1295 ret = find_new_extents(root, inode,
1296 newer_than, &newer_off,
1297 64 * 1024);
1298 if (!ret) {
1299 range->start = newer_off;
1300 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1301 } else {
1302 break;
f46b5a66 1303 }
4cb5300b 1304 } else {
008873ea 1305 if (ret > 0) {
cbcc8326 1306 i += ret;
008873ea
LZ		 1307 last_len += ret << PAGE_CACHE_SHIFT;
1308 } else {
cbcc8326 1309 i++;
008873ea
LZ		 1310 last_len = 0;
1311 }
f46b5a66 1312 }
f46b5a66
CH		 1313 }
1314
1e701a32
CM		 1315 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1316 filemap_flush(inode->i_mapping);
1317
1318 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1319 /* the filemap_flush will queue IO into the worker threads, but
1320 * we have to make sure the IO is actually started and that
1321 * ordered extents get created before we return
1322 */
1323 atomic_inc(&root->fs_info->async_submit_draining);
1324 while (atomic_read(&root->fs_info->nr_async_submits) ||
1325 atomic_read(&root->fs_info->async_delalloc_pages)) {
1326 wait_event(root->fs_info->async_submit_wait,
1327 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1328 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1329 }
1330 atomic_dec(&root->fs_info->async_submit_draining);
1331
1332 mutex_lock(&inode->i_mutex);
261507a0 1333 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1e701a32
CM		 1334 mutex_unlock(&inode->i_mutex);
1335 }
1336
1a419d85 1337 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1338 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1339 }
1340
60ccf82f 1341 ret = defrag_count;
940100a4 1342
4cb5300b
CM		 1343out_ra:
1344 if (!file)
1345 kfree(ra);
1346 kfree(pages);
940100a4 1347 return ret;
f46b5a66
CH		 1348}
1349
198605a8 1350static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1351 void __user *arg)
f46b5a66
CH		 1352{
1353 u64 new_size;
1354 u64 old_size;
1355 u64 devid = 1;
496ad9aa 1356 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 1357 struct btrfs_ioctl_vol_args *vol_args;
1358 struct btrfs_trans_handle *trans;
1359 struct btrfs_device *device = NULL;
1360 char *sizestr;
1361 char *devstr = NULL;
1362 int ret = 0;
f46b5a66
CH		 1363 int mod = 0;
1364
e441d54d
CM		 1365 if (!capable(CAP_SYS_ADMIN))
1366 return -EPERM;
1367
198605a8
MX		 1368 ret = mnt_want_write_file(file);
1369 if (ret)
1370 return ret;
1371
5ac00add
SB		 1372 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1373 1)) {
1374 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
97547676 1375 mnt_drop_write_file(file);
2c0c9da0 1376 return -EINVAL;
c9e9f97b
ID		 1377 }
1378
5ac00add 1379 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 1380 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1381 if (IS_ERR(vol_args)) {
1382 ret = PTR_ERR(vol_args);
1383 goto out;
1384 }
5516e595
MF		 1385
1386 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1387
f46b5a66
CH		 1388 sizestr = vol_args->name;
1389 devstr = strchr(sizestr, ':');
1390 if (devstr) {
1391 char *end;
1392 sizestr = devstr + 1;
1393 *devstr = '\0';
1394 devstr = vol_args->name;
1395 devid = simple_strtoull(devstr, &end, 10);
dfd79829
MX		 1396 if (!devid) {
1397 ret = -EINVAL;
1398 goto out_free;
1399 }
5bb14682 1400 printk(KERN_INFO "btrfs: resizing devid %llu\n",
21380931 1401 (unsigned long long)devid);
f46b5a66 1402 }
dba60f3f 1403
aa1b8cd4 1404 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1405 if (!device) {
5bb14682 1406 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
21380931 1407 (unsigned long long)devid);
dfd79829 1408 ret = -ENODEV;
c9e9f97b 1409 goto out_free;
f46b5a66 1410 }
dba60f3f
MX		 1411
1412 if (!device->writeable) {
4e42ae1b 1413 printk(KERN_INFO "btrfs: resizer unable to apply on "
dba60f3f 1414 "readonly device %llu\n",
a8c4a33b 1415 (unsigned long long)devid);
dfd79829 1416 ret = -EPERM;
4e42ae1b
LB		 1417 goto out_free;
1418 }
1419
f46b5a66
CH		 1420 if (!strcmp(sizestr, "max"))
1421 new_size = device->bdev->bd_inode->i_size;
1422 else {
1423 if (sizestr[0] == '-') {
1424 mod = -1;
1425 sizestr++;
1426 } else if (sizestr[0] == '+') {
1427 mod = 1;
1428 sizestr++;
1429 }
91748467 1430 new_size = memparse(sizestr, NULL);
f46b5a66
CH		 1431 if (new_size == 0) {
1432 ret = -EINVAL;
c9e9f97b 1433 goto out_free;
f46b5a66
CH		 1434 }
1435 }
1436
63a212ab 1437 if (device->is_tgtdev_for_dev_replace) {
dfd79829 1438 ret = -EPERM;
63a212ab
SB		 1439 goto out_free;
1440 }
1441
f46b5a66
CH		 1442 old_size = device->total_bytes;
1443
1444 if (mod < 0) {
1445 if (new_size > old_size) {
1446 ret = -EINVAL;
c9e9f97b 1447 goto out_free;
f46b5a66
CH		 1448 }
1449 new_size = old_size - new_size;
1450 } else if (mod > 0) {
1451 new_size = old_size + new_size;
1452 }
1453
1454 if (new_size < 256 * 1024 * 1024) {
1455 ret = -EINVAL;
c9e9f97b 1456 goto out_free;
f46b5a66
CH		 1457 }
1458 if (new_size > device->bdev->bd_inode->i_size) {
1459 ret = -EFBIG;
c9e9f97b 1460 goto out_free;
f46b5a66
CH		 1461 }
1462
1463 do_div(new_size, root->sectorsize);
1464 new_size *= root->sectorsize;
1465
606686ee
JB		 1466 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1467 rcu_str_deref(device->name),
1468 (unsigned long long)new_size);
f46b5a66
CH		 1469
1470 if (new_size > old_size) {
a22285a6 1471 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1472 if (IS_ERR(trans)) {
1473 ret = PTR_ERR(trans);
c9e9f97b 1474 goto out_free;
98d5dc13 1475 }
f46b5a66
CH		 1476 ret = btrfs_grow_device(trans, device, new_size);
1477 btrfs_commit_transaction(trans, root);
ece7d20e 1478 } else if (new_size < old_size) {
f46b5a66 1479 ret = btrfs_shrink_device(device, new_size);
0253f40e 1480 } /* equal, nothing need to do */
f46b5a66 1481
c9e9f97b 1482out_free:
f46b5a66 1483 kfree(vol_args);
c9e9f97b
ID		 1484out:
1485 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 1486 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
18f39c41 1487 mnt_drop_write_file(file);
f46b5a66
CH		 1488 return ret;
1489}
1490
72fd032e 1491static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1492 char *name, unsigned long fd, int subvol,
1493 u64 *transid, bool readonly,
8696c533 1494 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1495{
f46b5a66 1496 int namelen;
3de4586c 1497 int ret = 0;
f46b5a66 1498
879149a0
JM		 1499 if (!S_ISDIR(file_inode(file)->i_mode))
1500 return -ENOTDIR;
1501
a874a63e
LB		 1502 ret = mnt_want_write_file(file);
1503 if (ret)
1504 goto out;
1505
72fd032e
SW		 1506 namelen = strlen(name);
1507 if (strchr(name, '/')) {
f46b5a66 1508 ret = -EINVAL;
a874a63e 1509 goto out_drop_write;
f46b5a66
CH		 1510 }
1511
16780cab
CM		 1512 if (name[0] == '.' &&
1513 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1514 ret = -EEXIST;
a874a63e 1515 goto out_drop_write;
16780cab
CM		 1516 }
1517
3de4586c 1518 if (subvol) {
72fd032e 1519 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1520 NULL, transid, readonly, inherit);
cb8e7090 1521 } else {
2903ff01 1522 struct fd src = fdget(fd);
3de4586c 1523 struct inode *src_inode;
2903ff01 1524 if (!src.file) {
3de4586c 1525 ret = -EINVAL;
a874a63e 1526 goto out_drop_write;
3de4586c
CM		 1527 }
1528
496ad9aa
AV		 1529 src_inode = file_inode(src.file);
1530 if (src_inode->i_sb != file_inode(file)->i_sb) {
d397712b
CM		 1531 printk(KERN_INFO "btrfs: Snapshot src from "
1532 "another FS\n");
3de4586c 1533 ret = -EINVAL;
f0cea52a
DS		 1534 } else if (!inode_owner_or_capable(src_inode)) {
1535 /*
1536 * Subvolume creation is not restricted, but snapshots
1537 * are limited to own subvolumes only
1538 */
1539 ret = -EPERM;
ecd18815
AV		 1540 } else {
1541 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1542 BTRFS_I(src_inode)->root,
1543 transid, readonly, inherit);
3de4586c 1544 }
2903ff01 1545 fdput(src);
cb8e7090 1546 }
a874a63e
LB		 1547out_drop_write:
1548 mnt_drop_write_file(file);
f46b5a66 1549out:
72fd032e
SW		 1550 return ret;
1551}
1552
1553static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1554 void __user *arg, int subvol)
72fd032e 1555{
fa0d2b9b 1556 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1557 int ret;
1558
879149a0
JM		 1559 if (!S_ISDIR(file_inode(file)->i_mode))
1560 return -ENOTDIR;
1561
fa0d2b9b
LZ		 1562 vol_args = memdup_user(arg, sizeof(*vol_args));
1563 if (IS_ERR(vol_args))
1564 return PTR_ERR(vol_args);
1565 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1566
fa0d2b9b 1567 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1568 vol_args->fd, subvol,
6f72c7e2 1569 NULL, false, NULL);
fdfb1e4f 1570
fa0d2b9b
LZ		 1571 kfree(vol_args);
1572 return ret;
1573}
fdfb1e4f 1574
fa0d2b9b
LZ		 1575static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1576 void __user *arg, int subvol)
1577{
1578 struct btrfs_ioctl_vol_args_v2 *vol_args;
1579 int ret;
1580 u64 transid = 0;
1581 u64 *ptr = NULL;
b83cc969 1582 bool readonly = false;
6f72c7e2 1583 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1584
879149a0
JM		 1585 if (!S_ISDIR(file_inode(file)->i_mode))
1586 return -ENOTDIR;
1587
fa0d2b9b
LZ		 1588 vol_args = memdup_user(arg, sizeof(*vol_args));
1589 if (IS_ERR(vol_args))
1590 return PTR_ERR(vol_args);
1591 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1592
b83cc969 1593 if (vol_args->flags &
6f72c7e2
AJ		 1594 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1595 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1596 ret = -EOPNOTSUPP;
fa0d2b9b 1597 goto out;
72fd032e 1598 }
fa0d2b9b
LZ		 1599
1600 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1601 ptr = &transid;
b83cc969
LZ		 1602 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1603 readonly = true;
6f72c7e2
AJ		 1604 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1605 if (vol_args->size > PAGE_CACHE_SIZE) {
1606 ret = -EINVAL;
1607 goto out;
1608 }
1609 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1610 if (IS_ERR(inherit)) {
1611 ret = PTR_ERR(inherit);
1612 goto out;
1613 }
1614 }
fa0d2b9b
LZ		 1615
1616 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1617 vol_args->fd, subvol, ptr,
8696c533 1618 readonly, inherit);
fa0d2b9b
LZ		 1619
1620 if (ret == 0 && ptr &&
1621 copy_to_user(arg +
1622 offsetof(struct btrfs_ioctl_vol_args_v2,
1623 transid), ptr, sizeof(*ptr)))
1624 ret = -EFAULT;
fdfb1e4f 1625out:
f46b5a66 1626 kfree(vol_args);
6f72c7e2 1627 kfree(inherit);
f46b5a66
CH		 1628 return ret;
1629}
1630
0caa102d
LZ		 1631static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1632 void __user *arg)
1633{
496ad9aa 1634 struct inode *inode = file_inode(file);
0caa102d
LZ		 1635 struct btrfs_root *root = BTRFS_I(inode)->root;
1636 int ret = 0;
1637 u64 flags = 0;
1638
33345d01 1639 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1640 return -EINVAL;
1641
1642 down_read(&root->fs_info->subvol_sem);
1643 if (btrfs_root_readonly(root))
1644 flags |= BTRFS_SUBVOL_RDONLY;
1645 up_read(&root->fs_info->subvol_sem);
1646
1647 if (copy_to_user(arg, &flags, sizeof(flags)))
1648 ret = -EFAULT;
1649
1650 return ret;
1651}
1652
1653static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1654 void __user *arg)
1655{
496ad9aa 1656 struct inode *inode = file_inode(file);
0caa102d
LZ		 1657 struct btrfs_root *root = BTRFS_I(inode)->root;
1658 struct btrfs_trans_handle *trans;
1659 u64 root_flags;
1660 u64 flags;
1661 int ret = 0;
1662
b9ca0664
LB		 1663 ret = mnt_want_write_file(file);
1664 if (ret)
1665 goto out;
0caa102d 1666
b9ca0664
LB		 1667 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1668 ret = -EINVAL;
1669 goto out_drop_write;
1670 }
0caa102d 1671
b9ca0664
LB		 1672 if (copy_from_user(&flags, arg, sizeof(flags))) {
1673 ret = -EFAULT;
1674 goto out_drop_write;
1675 }
0caa102d 1676
b9ca0664
LB		 1677 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1678 ret = -EINVAL;
1679 goto out_drop_write;
1680 }
0caa102d 1681
b9ca0664
LB		 1682 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1683 ret = -EOPNOTSUPP;
1684 goto out_drop_write;
1685 }
0caa102d 1686
b9ca0664
LB		 1687 if (!inode_owner_or_capable(inode)) {
1688 ret = -EACCES;
1689 goto out_drop_write;
1690 }
b4dc2b8c 1691
0caa102d
LZ		 1692 down_write(&root->fs_info->subvol_sem);
1693
1694 /* nothing to do */
1695 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1696 goto out_drop_sem;
0caa102d
LZ		 1697
1698 root_flags = btrfs_root_flags(&root->root_item);
1699 if (flags & BTRFS_SUBVOL_RDONLY)
1700 btrfs_set_root_flags(&root->root_item,
1701 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1702 else
1703 btrfs_set_root_flags(&root->root_item,
1704 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1705
1706 trans = btrfs_start_transaction(root, 1);
1707 if (IS_ERR(trans)) {
1708 ret = PTR_ERR(trans);
1709 goto out_reset;
1710 }
1711
b4dc2b8c 1712 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1713 &root->root_key, &root->root_item);
1714
1715 btrfs_commit_transaction(trans, root);
1716out_reset:
1717 if (ret)
1718 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1719out_drop_sem:
0caa102d 1720 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1721out_drop_write:
1722 mnt_drop_write_file(file);
1723out:
0caa102d
LZ		 1724 return ret;
1725}
1726
76dda93c
YZ		 1727/*
1728 * helper to check if the subvolume references other subvolumes
1729 */
1730static noinline int may_destroy_subvol(struct btrfs_root *root)
1731{
1732 struct btrfs_path *path;
1733 struct btrfs_key key;
1734 int ret;
1735
1736 path = btrfs_alloc_path();
1737 if (!path)
1738 return -ENOMEM;
1739
1740 key.objectid = root->root_key.objectid;
1741 key.type = BTRFS_ROOT_REF_KEY;
1742 key.offset = (u64)-1;
1743
1744 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1745 &key, path, 0, 0);
1746 if (ret < 0)
1747 goto out;
1748 BUG_ON(ret == 0);
1749
1750 ret = 0;
1751 if (path->slots[0] > 0) {
1752 path->slots[0]--;
1753 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1754 if (key.objectid == root->root_key.objectid &&
1755 key.type == BTRFS_ROOT_REF_KEY)
1756 ret = -ENOTEMPTY;
1757 }
1758out:
1759 btrfs_free_path(path);
1760 return ret;
1761}
1762
ac8e9819
CM		 1763static noinline int key_in_sk(struct btrfs_key *key,
1764 struct btrfs_ioctl_search_key *sk)
1765{
abc6e134
CM		 1766 struct btrfs_key test;
1767 int ret;
1768
1769 test.objectid = sk->min_objectid;
1770 test.type = sk->min_type;
1771 test.offset = sk->min_offset;
1772
1773 ret = btrfs_comp_cpu_keys(key, &test);
1774 if (ret < 0)
ac8e9819 1775 return 0;
abc6e134
CM		 1776
1777 test.objectid = sk->max_objectid;
1778 test.type = sk->max_type;
1779 test.offset = sk->max_offset;
1780
1781 ret = btrfs_comp_cpu_keys(key, &test);
1782 if (ret > 0)
ac8e9819
CM		 1783 return 0;
1784 return 1;
1785}
1786
1787static noinline int copy_to_sk(struct btrfs_root *root,
1788 struct btrfs_path *path,
1789 struct btrfs_key *key,
1790 struct btrfs_ioctl_search_key *sk,
1791 char *buf,
1792 unsigned long *sk_offset,
1793 int *num_found)
1794{
1795 u64 found_transid;
1796 struct extent_buffer *leaf;
1797 struct btrfs_ioctl_search_header sh;
1798 unsigned long item_off;
1799 unsigned long item_len;
1800 int nritems;
1801 int i;
1802 int slot;
ac8e9819
CM		 1803 int ret = 0;
1804
1805 leaf = path->nodes[0];
1806 slot = path->slots[0];
1807 nritems = btrfs_header_nritems(leaf);
1808
1809 if (btrfs_header_generation(leaf) > sk->max_transid) {
1810 i = nritems;
1811 goto advance_key;
1812 }
1813 found_transid = btrfs_header_generation(leaf);
1814
1815 for (i = slot; i < nritems; i++) {
1816 item_off = btrfs_item_ptr_offset(leaf, i);
1817 item_len = btrfs_item_size_nr(leaf, i);
1818
03b71c6c
GP		 1819 btrfs_item_key_to_cpu(leaf, key, i);
1820 if (!key_in_sk(key, sk))
1821 continue;
1822
1823 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
ac8e9819
CM		 1824 item_len = 0;
1825
1826 if (sizeof(sh) + item_len + *sk_offset >
1827 BTRFS_SEARCH_ARGS_BUFSIZE) {
1828 ret = 1;
1829 goto overflow;
1830 }
1831
ac8e9819
CM		 1832 sh.objectid = key->objectid;
1833 sh.offset = key->offset;
1834 sh.type = key->type;
1835 sh.len = item_len;
1836 sh.transid = found_transid;
1837
1838 /* copy search result header */
1839 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1840 *sk_offset += sizeof(sh);
1841
1842 if (item_len) {
1843 char *p = buf + *sk_offset;
1844 /* copy the item */
1845 read_extent_buffer(leaf, p,
1846 item_off, item_len);
1847 *sk_offset += item_len;
ac8e9819 1848 }
e2156867 1849 (*num_found)++;
ac8e9819
CM		 1850
1851 if (*num_found >= sk->nr_items)
1852 break;
1853 }
1854advance_key:
abc6e134
CM		 1855 ret = 0;
1856 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1857 key->offset++;
abc6e134
CM		 1858 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1859 key->offset = 0;
ac8e9819 1860 key->type++;
abc6e134
CM		 1861 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1862 key->offset = 0;
1863 key->type = 0;
ac8e9819 1864 key->objectid++;
abc6e134
CM		 1865 } else
1866 ret = 1;
ac8e9819 1867overflow:
ac8e9819
CM		 1868 return ret;
1869}
1870
1871static noinline int search_ioctl(struct inode *inode,
1872 struct btrfs_ioctl_search_args *args)
1873{
1874 struct btrfs_root *root;
1875 struct btrfs_key key;
1876 struct btrfs_key max_key;
1877 struct btrfs_path *path;
1878 struct btrfs_ioctl_search_key *sk = &args->key;
1879 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1880 int ret;
1881 int num_found = 0;
1882 unsigned long sk_offset = 0;
1883
1884 path = btrfs_alloc_path();
1885 if (!path)
1886 return -ENOMEM;
1887
1888 if (sk->tree_id == 0) {
1889 /* search the root of the inode that was passed */
1890 root = BTRFS_I(inode)->root;
1891 } else {
1892 key.objectid = sk->tree_id;
1893 key.type = BTRFS_ROOT_ITEM_KEY;
1894 key.offset = (u64)-1;
1895 root = btrfs_read_fs_root_no_name(info, &key);
1896 if (IS_ERR(root)) {
1897 printk(KERN_ERR "could not find root %llu\n",
1898 sk->tree_id);
1899 btrfs_free_path(path);
1900 return -ENOENT;
1901 }
1902 }
1903
1904 key.objectid = sk->min_objectid;
1905 key.type = sk->min_type;
1906 key.offset = sk->min_offset;
1907
1908 max_key.objectid = sk->max_objectid;
1909 max_key.type = sk->max_type;
1910 max_key.offset = sk->max_offset;
1911
1912 path->keep_locks = 1;
1913
1914 while(1) {
de78b51a 1915 ret = btrfs_search_forward(root, &key, &max_key, path,
ac8e9819
CM		 1916 sk->min_transid);
1917 if (ret != 0) {
1918 if (ret > 0)
1919 ret = 0;
1920 goto err;
1921 }
1922 ret = copy_to_sk(root, path, &key, sk, args->buf,
1923 &sk_offset, &num_found);
b3b4aa74 1924 btrfs_release_path(path);
ac8e9819
CM		 1925 if (ret || num_found >= sk->nr_items)
1926 break;
1927
1928 }
1929 ret = 0;
1930err:
1931 sk->nr_items = num_found;
1932 btrfs_free_path(path);
1933 return ret;
1934}
1935
1936static noinline int btrfs_ioctl_tree_search(struct file *file,
1937 void __user *argp)
1938{
1939 struct btrfs_ioctl_search_args *args;
1940 struct inode *inode;
1941 int ret;
1942
1943 if (!capable(CAP_SYS_ADMIN))
1944 return -EPERM;
1945
2354d08f
JL		 1946 args = memdup_user(argp, sizeof(*args));
1947 if (IS_ERR(args))
1948 return PTR_ERR(args);
ac8e9819 1949
496ad9aa 1950 inode = file_inode(file);
ac8e9819
CM		 1951 ret = search_ioctl(inode, args);
1952 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1953 ret = -EFAULT;
1954 kfree(args);
1955 return ret;
1956}
1957
98d377a0 1958/*
ac8e9819
CM		 1959 * Search INODE_REFs to identify path name of 'dirid' directory
1960 * in a 'tree_id' tree. and sets path name to 'name'.
1961 */
98d377a0
TH		 1962static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1963 u64 tree_id, u64 dirid, char *name)
1964{
1965 struct btrfs_root *root;
1966 struct btrfs_key key;
ac8e9819 1967 char *ptr;
98d377a0
TH		 1968 int ret = -1;
1969 int slot;
1970 int len;
1971 int total_len = 0;
1972 struct btrfs_inode_ref *iref;
1973 struct extent_buffer *l;
1974 struct btrfs_path *path;
1975
1976 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1977 name[0]='\0';
1978 return 0;
1979 }
1980
1981 path = btrfs_alloc_path();
1982 if (!path)
1983 return -ENOMEM;
1984
ac8e9819 1985 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 1986
1987 key.objectid = tree_id;
1988 key.type = BTRFS_ROOT_ITEM_KEY;
1989 key.offset = (u64)-1;
1990 root = btrfs_read_fs_root_no_name(info, &key);
1991 if (IS_ERR(root)) {
1992 printk(KERN_ERR "could not find root %llu\n", tree_id);
8ad6fcab
CM		 1993 ret = -ENOENT;
1994 goto out;
98d377a0
TH		 1995 }
1996
1997 key.objectid = dirid;
1998 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 1999 key.offset = (u64)-1;
98d377a0
TH		 2000
2001 while(1) {
2002 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2003 if (ret < 0)
2004 goto out;
2005
2006 l = path->nodes[0];
2007 slot = path->slots[0];
8ad6fcab
CM		 2008 if (ret > 0 && slot > 0)
2009 slot--;
98d377a0
TH		 2010 btrfs_item_key_to_cpu(l, &key, slot);
2011
2012 if (ret > 0 && (key.objectid != dirid ||
ac8e9819
CM		 2013 key.type != BTRFS_INODE_REF_KEY)) {
2014 ret = -ENOENT;
98d377a0 2015 goto out;
ac8e9819 2016 }
98d377a0
TH		 2017
2018 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2019 len = btrfs_inode_ref_name_len(l, iref);
2020 ptr -= len + 1;
2021 total_len += len + 1;
ac8e9819 2022 if (ptr < name)
98d377a0
TH		 2023 goto out;
2024
2025 *(ptr + len) = '/';
2026 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
2027
2028 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2029 break;
2030
b3b4aa74 2031 btrfs_release_path(path);
98d377a0 2032 key.objectid = key.offset;
8ad6fcab 2033 key.offset = (u64)-1;
98d377a0 2034 dirid = key.objectid;
98d377a0 2035 }
ac8e9819 2036 if (ptr < name)
98d377a0 2037 goto out;
77906a50 2038 memmove(name, ptr, total_len);
98d377a0
TH		 2039 name[total_len]='\0';
2040 ret = 0;
2041out:
2042 btrfs_free_path(path);
ac8e9819
CM		 2043 return ret;
2044}
2045
2046static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2047 void __user *argp)
2048{
2049 struct btrfs_ioctl_ino_lookup_args *args;
2050 struct inode *inode;
2051 int ret;
2052
2053 if (!capable(CAP_SYS_ADMIN))
2054 return -EPERM;
2055
2354d08f
JL		 2056 args = memdup_user(argp, sizeof(*args));
2057 if (IS_ERR(args))
2058 return PTR_ERR(args);
c2b96929 2059
496ad9aa 2060 inode = file_inode(file);
ac8e9819 2061
1b53ac4d
CM		 2062 if (args->treeid == 0)
2063 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2064
ac8e9819
CM		 2065 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2066 args->treeid, args->objectid,
2067 args->name);
2068
2069 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2070 ret = -EFAULT;
2071
2072 kfree(args);
98d377a0
TH		 2073 return ret;
2074}
2075
76dda93c
YZ		 2076static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2077 void __user *arg)
2078{
2079 struct dentry *parent = fdentry(file);
2080 struct dentry *dentry;
2081 struct inode *dir = parent->d_inode;
2082 struct inode *inode;
2083 struct btrfs_root *root = BTRFS_I(dir)->root;
2084 struct btrfs_root *dest = NULL;
2085 struct btrfs_ioctl_vol_args *vol_args;
2086 struct btrfs_trans_handle *trans;
c58aaad2
MX		 2087 struct btrfs_block_rsv block_rsv;
2088 u64 qgroup_reserved;
76dda93c
YZ		 2089 int namelen;
2090 int ret;
2091 int err = 0;
2092
879149a0
JM		 2093 if (!S_ISDIR(dir->i_mode))
2094 return -ENOTDIR;
2095
76dda93c
YZ		 2096 vol_args = memdup_user(arg, sizeof(*vol_args));
2097 if (IS_ERR(vol_args))
2098 return PTR_ERR(vol_args);
2099
2100 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2101 namelen = strlen(vol_args->name);
2102 if (strchr(vol_args->name, '/') ||
2103 strncmp(vol_args->name, "..", namelen) == 0) {
2104 err = -EINVAL;
2105 goto out;
2106 }
2107
a561be71 2108 err = mnt_want_write_file(file);
76dda93c
YZ		 2109 if (err)
2110 goto out;
2111
5c50c9b8
DS		 2112 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2113 if (err == -EINTR)
89ec7522 2114 goto out_drop_write;
76dda93c
YZ		 2115 dentry = lookup_one_len(vol_args->name, parent, namelen);
2116 if (IS_ERR(dentry)) {
2117 err = PTR_ERR(dentry);
2118 goto out_unlock_dir;
2119 }
2120
2121 if (!dentry->d_inode) {
2122 err = -ENOENT;
2123 goto out_dput;
2124 }
2125
2126 inode = dentry->d_inode;
4260f7c7
SW		 2127 dest = BTRFS_I(inode)->root;
2128 if (!capable(CAP_SYS_ADMIN)){
2129 /*
2130 * Regular user. Only allow this with a special mount
2131 * option, when the user has write+exec access to the
2132 * subvol root, and when rmdir(2) would have been
2133 * allowed.
2134 *
2135 * Note that this is _not_ check that the subvol is
2136 * empty or doesn't contain data that we wouldn't
2137 * otherwise be able to delete.
2138 *
2139 * Users who want to delete empty subvols should try
2140 * rmdir(2).
2141 */
2142 err = -EPERM;
2143 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2144 goto out_dput;
2145
2146 /*
2147 * Do not allow deletion if the parent dir is the same
2148 * as the dir to be deleted. That means the ioctl
2149 * must be called on the dentry referencing the root
2150 * of the subvol, not a random directory contained
2151 * within it.
2152 */
2153 err = -EINVAL;
2154 if (root == dest)
2155 goto out_dput;
2156
2157 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2158 if (err)
2159 goto out_dput;
4260f7c7
SW		 2160 }
2161
5c39da5b
MX		 2162 /* check if subvolume may be deleted by a user */
2163 err = btrfs_may_delete(dir, dentry, 1);
2164 if (err)
2165 goto out_dput;
2166
33345d01 2167 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2168 err = -EINVAL;
2169 goto out_dput;
2170 }
2171
76dda93c
YZ		 2172 mutex_lock(&inode->i_mutex);
2173 err = d_invalidate(dentry);
2174 if (err)
2175 goto out_unlock;
2176
2177 down_write(&root->fs_info->subvol_sem);
2178
2179 err = may_destroy_subvol(dest);
2180 if (err)
2181 goto out_up_write;
2182
c58aaad2
MX		 2183 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2184 /*
2185 * One for dir inode, two for dir entries, two for root
2186 * ref/backref.
2187 */
2188 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2189 5, &qgroup_reserved);
2190 if (err)
2191 goto out_up_write;
2192
a22285a6
YZ		 2193 trans = btrfs_start_transaction(root, 0);
2194 if (IS_ERR(trans)) {
2195 err = PTR_ERR(trans);
c58aaad2 2196 goto out_release;
a22285a6 2197 }
c58aaad2
MX		 2198 trans->block_rsv = &block_rsv;
2199 trans->bytes_reserved = block_rsv.size;
a22285a6 2200
76dda93c
YZ		 2201 ret = btrfs_unlink_subvol(trans, root, dir,
2202 dest->root_key.objectid,
2203 dentry->d_name.name,
2204 dentry->d_name.len);
79787eaa
JM		 2205 if (ret) {
2206 err = ret;
2207 btrfs_abort_transaction(trans, root, ret);
2208 goto out_end_trans;
2209 }
76dda93c
YZ		 2210
2211 btrfs_record_root_in_trans(trans, dest);
2212
2213 memset(&dest->root_item.drop_progress, 0,
2214 sizeof(dest->root_item.drop_progress));
2215 dest->root_item.drop_level = 0;
2216 btrfs_set_root_refs(&dest->root_item, 0);
2217
d68fc57b
YZ		 2218 if (!xchg(&dest->orphan_item_inserted, 1)) {
2219 ret = btrfs_insert_orphan_item(trans,
2220 root->fs_info->tree_root,
2221 dest->root_key.objectid);
79787eaa
JM		 2222 if (ret) {
2223 btrfs_abort_transaction(trans, root, ret);
2224 err = ret;
2225 goto out_end_trans;
2226 }
d68fc57b 2227 }
79787eaa 2228out_end_trans:
c58aaad2
MX		 2229 trans->block_rsv = NULL;
2230 trans->bytes_reserved = 0;
531cb13f 2231 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2232 if (ret && !err)
2233 err = ret;
76dda93c 2234 inode->i_flags |= S_DEAD;
c58aaad2
MX		 2235out_release:
2236 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
76dda93c
YZ		 2237out_up_write:
2238 up_write(&root->fs_info->subvol_sem);
2239out_unlock:
2240 mutex_unlock(&inode->i_mutex);
2241 if (!err) {
efefb143 2242 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2243 btrfs_invalidate_inodes(dest);
2244 d_delete(dentry);
fa6ac876
LB		 2245
2246 /* the last ref */
2247 if (dest->cache_inode) {
2248 iput(dest->cache_inode);
2249 dest->cache_inode = NULL;
2250 }
76dda93c
YZ		 2251 }
2252out_dput:
2253 dput(dentry);
2254out_unlock_dir:
2255 mutex_unlock(&dir->i_mutex);
89ec7522 2256out_drop_write:
2a79f17e 2257 mnt_drop_write_file(file);
76dda93c
YZ		 2258out:
2259 kfree(vol_args);
2260 return err;
2261}
2262
1e701a32 2263static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2264{
496ad9aa 2265 struct inode *inode = file_inode(file);
f46b5a66 2266 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2267 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2268 int ret;
2269
25122d15
ID		 2270 ret = mnt_want_write_file(file);
2271 if (ret)
2272 return ret;
b83cc969 2273
25122d15
ID		 2274 if (btrfs_root_readonly(root)) {
2275 ret = -EROFS;
2276 goto out;
5ac00add 2277 }
f46b5a66
CH		 2278
2279 switch (inode->i_mode & S_IFMT) {
2280 case S_IFDIR:
e441d54d
CM		 2281 if (!capable(CAP_SYS_ADMIN)) {
2282 ret = -EPERM;
2283 goto out;
2284 }
de78b51a 2285 ret = btrfs_defrag_root(root);
8929ecfa
YZ		 2286 if (ret)
2287 goto out;
de78b51a 2288 ret = btrfs_defrag_root(root->fs_info->extent_root);
f46b5a66
CH		 2289 break;
2290 case S_IFREG:
e441d54d
CM		 2291 if (!(file->f_mode & FMODE_WRITE)) {
2292 ret = -EINVAL;
2293 goto out;
2294 }
1e701a32
CM		 2295
2296 range = kzalloc(sizeof(*range), GFP_KERNEL);
2297 if (!range) {
2298 ret = -ENOMEM;
2299 goto out;
2300 }
2301
2302 if (argp) {
2303 if (copy_from_user(range, argp,
2304 sizeof(*range))) {
2305 ret = -EFAULT;
2306 kfree(range);
683be16e 2307 goto out;
1e701a32
CM		 2308 }
2309 /* compression requires us to start the IO */
2310 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2311 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2312 range->extent_thresh = (u32)-1;
2313 }
2314 } else {
2315 /* the rest are all set to zero by kzalloc */
2316 range->len = (u64)-1;
2317 }
496ad9aa 2318 ret = btrfs_defrag_file(file_inode(file), file,
4cb5300b
CM		 2319 range, 0, 0);
2320 if (ret > 0)
2321 ret = 0;
1e701a32 2322 kfree(range);
f46b5a66 2323 break;
8929ecfa
YZ		 2324 default:
2325 ret = -EINVAL;
f46b5a66 2326 }
e441d54d 2327out:
25122d15 2328 mnt_drop_write_file(file);
e441d54d 2329 return ret;
f46b5a66
CH		 2330}
2331
b2950863 2332static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2333{
2334 struct btrfs_ioctl_vol_args *vol_args;
2335 int ret;
2336
e441d54d
CM		 2337 if (!capable(CAP_SYS_ADMIN))
2338 return -EPERM;
2339
5ac00add
SB		 2340 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2341 1)) {
2342 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
2c0c9da0 2343 return -EINVAL;
c9e9f97b
ID		 2344 }
2345
5ac00add 2346 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2347 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2348 if (IS_ERR(vol_args)) {
2349 ret = PTR_ERR(vol_args);
2350 goto out;
2351 }
f46b5a66 2352
5516e595 2353 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2354 ret = btrfs_init_new_device(root, vol_args->name);
2355
f46b5a66 2356 kfree(vol_args);
c9e9f97b
ID		 2357out:
2358 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2359 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
f46b5a66
CH		 2360 return ret;
2361}
2362
da24927b 2363static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 2364{
496ad9aa 2365 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 2366 struct btrfs_ioctl_vol_args *vol_args;
2367 int ret;
2368
e441d54d
CM		 2369 if (!capable(CAP_SYS_ADMIN))
2370 return -EPERM;
2371
da24927b
MX		 2372 ret = mnt_want_write_file(file);
2373 if (ret)
2374 return ret;
c146afad 2375
5ac00add
SB		 2376 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2377 1)) {
2378 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
da24927b 2379 mnt_drop_write_file(file);
2c0c9da0 2380 return -EINVAL;
c9e9f97b
ID		 2381 }
2382
5ac00add 2383 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2384 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2385 if (IS_ERR(vol_args)) {
2386 ret = PTR_ERR(vol_args);
2387 goto out;
2388 }
f46b5a66 2389
5516e595 2390 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2391 ret = btrfs_rm_device(root, vol_args->name);
2392
f46b5a66 2393 kfree(vol_args);
c9e9f97b
ID		 2394out:
2395 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2396 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
4ac20c70 2397 mnt_drop_write_file(file);
f46b5a66
CH		 2398 return ret;
2399}
2400
475f6387
JS		 2401static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2402{
027ed2f0 2403 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2404 struct btrfs_device *device;
2405 struct btrfs_device *next;
2406 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2407 int ret = 0;
475f6387
JS		 2408
2409 if (!capable(CAP_SYS_ADMIN))
2410 return -EPERM;
2411
027ed2f0
LZ		 2412 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2413 if (!fi_args)
2414 return -ENOMEM;
2415
2416 fi_args->num_devices = fs_devices->num_devices;
2417 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387
JS		 2418
2419 mutex_lock(&fs_devices->device_list_mutex);
2420 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2421 if (device->devid > fi_args->max_id)
2422 fi_args->max_id = device->devid;
475f6387
JS		 2423 }
2424 mutex_unlock(&fs_devices->device_list_mutex);
2425
027ed2f0
LZ		 2426 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2427 ret = -EFAULT;
475f6387 2428
027ed2f0
LZ		 2429 kfree(fi_args);
2430 return ret;
475f6387
JS		 2431}
2432
2433static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2434{
2435 struct btrfs_ioctl_dev_info_args *di_args;
2436 struct btrfs_device *dev;
2437 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2438 int ret = 0;
2439 char *s_uuid = NULL;
2440 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2441
2442 if (!capable(CAP_SYS_ADMIN))
2443 return -EPERM;
2444
2445 di_args = memdup_user(arg, sizeof(*di_args));
2446 if (IS_ERR(di_args))
2447 return PTR_ERR(di_args);
2448
2449 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2450 s_uuid = di_args->uuid;
2451
2452 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2453 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2454
2455 if (!dev) {
2456 ret = -ENODEV;
2457 goto out;
2458 }
2459
2460 di_args->devid = dev->devid;
2461 di_args->bytes_used = dev->bytes_used;
2462 di_args->total_bytes = dev->total_bytes;
2463 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2464 if (dev->name) {
606686ee
JB		 2465 struct rcu_string *name;
2466
2467 rcu_read_lock();
2468 name = rcu_dereference(dev->name);
2469 strncpy(di_args->path, name->str, sizeof(di_args->path));
2470 rcu_read_unlock();
a27202fb
JM		 2471 di_args->path[sizeof(di_args->path) - 1] = 0;
2472 } else {
99ba55ad 2473 di_args->path[0] = '\0';
a27202fb 2474 }
475f6387
JS		 2475
2476out:
55793c0d 2477 mutex_unlock(&fs_devices->device_list_mutex);
475f6387
JS		 2478 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2479 ret = -EFAULT;
2480
2481 kfree(di_args);
2482 return ret;
2483}
2484
76dda93c
YZ		 2485static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2486 u64 off, u64 olen, u64 destoff)
f46b5a66 2487{
496ad9aa 2488 struct inode *inode = file_inode(file);
f46b5a66 2489 struct btrfs_root *root = BTRFS_I(inode)->root;
2903ff01 2490 struct fd src_file;
f46b5a66
CH		 2491 struct inode *src;
2492 struct btrfs_trans_handle *trans;
f46b5a66 2493 struct btrfs_path *path;
f46b5a66 2494 struct extent_buffer *leaf;
ae01a0ab
YZ		 2495 char *buf;
2496 struct btrfs_key key;
f46b5a66
CH		 2497 u32 nritems;
2498 int slot;
ae01a0ab 2499 int ret;
c5c9cd4d
SW		 2500 u64 len = olen;
2501 u64 bs = root->fs_info->sb->s_blocksize;
d20f7043 2502
c5c9cd4d
SW		 2503 /*
2504 * TODO:
2505 * - split compressed inline extents. annoying: we need to
2506 * decompress into destination's address_space (the file offset
2507 * may change, so source mapping won't do), then recompress (or
2508 * otherwise reinsert) a subrange.
2509 * - allow ranges within the same file to be cloned (provided
2510 * they don't overlap)?
2511 */
2512
e441d54d 2513 /* the destination must be opened for writing */
2ebc3464 2514 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
e441d54d
CM		 2515 return -EINVAL;
2516
b83cc969
LZ		 2517 if (btrfs_root_readonly(root))
2518 return -EROFS;
2519
a561be71 2520 ret = mnt_want_write_file(file);
c146afad
YZ		 2521 if (ret)
2522 return ret;
2523
2903ff01
AV		 2524 src_file = fdget(srcfd);
2525 if (!src_file.file) {
ab67b7c1
YZ		 2526 ret = -EBADF;
2527 goto out_drop_write;
2528 }
5dc64164 2529
362a20c5 2530 ret = -EXDEV;
2903ff01 2531 if (src_file.file->f_path.mnt != file->f_path.mnt)
362a20c5
DS		 2532 goto out_fput;
2533
496ad9aa 2534 src = file_inode(src_file.file);
f46b5a66 2535
c5c9cd4d
SW		 2536 ret = -EINVAL;
2537 if (src == inode)
2538 goto out_fput;
2539
5dc64164 2540 /* the src must be open for reading */
2903ff01 2541 if (!(src_file.file->f_mode & FMODE_READ))
5dc64164
DR		 2542 goto out_fput;
2543
0e7b824c
LZ		 2544 /* don't make the dst file partly checksummed */
2545 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2546 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2547 goto out_fput;
2548
ae01a0ab
YZ		 2549 ret = -EISDIR;
2550 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2551 goto out_fput;
2552
f46b5a66 2553 ret = -EXDEV;
362a20c5 2554 if (src->i_sb != inode->i_sb)
ae01a0ab
YZ		 2555 goto out_fput;
2556
2557 ret = -ENOMEM;
2558 buf = vmalloc(btrfs_level_size(root, 0));
2559 if (!buf)
2560 goto out_fput;
2561
2562 path = btrfs_alloc_path();
2563 if (!path) {
2564 vfree(buf);
f46b5a66 2565 goto out_fput;
ae01a0ab
YZ		 2566 }
2567 path->reada = 2;
f46b5a66
CH		 2568
2569 if (inode < src) {
fccdae43
SW		 2570 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2571 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
f46b5a66 2572 } else {
fccdae43
SW		 2573 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2574 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
f46b5a66
CH		 2575 }
2576
c5c9cd4d
SW		 2577 /* determine range to clone */
2578 ret = -EINVAL;
2ebc3464 2579 if (off + len > src->i_size || off + len < off)
f46b5a66 2580 goto out_unlock;
c5c9cd4d
SW		 2581 if (len == 0)
2582 olen = len = src->i_size - off;
2583 /* if we extend to eof, continue to block boundary */
2584 if (off + len == src->i_size)
2a6b8dae 2585 len = ALIGN(src->i_size, bs) - off;
c5c9cd4d 2586
6073c416
FM		 2587 if (len == 0) {
2588 ret = 0;
2589 goto out_unlock;
2590 }
2591
c5c9cd4d 2592 /* verify the end result is block aligned */
2a6b8dae
LZ		 2593 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2594 !IS_ALIGNED(destoff, bs))
c5c9cd4d
SW		 2595 goto out_unlock;
2596
d525e8ab
LZ		 2597 if (destoff > inode->i_size) {
2598 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2599 if (ret)
2600 goto out_unlock;
2601 }
2602
71ef0786
LZ		 2603 /* truncate page cache pages from target inode range */
2604 truncate_inode_pages_range(&inode->i_data, destoff,
2605 PAGE_CACHE_ALIGN(destoff + len) - 1);
2606
f46b5a66
CH		 2607 /* do any pending delalloc/csum calc on src, one way or
2608 another, and lock file content */
2609 while (1) {
31840ae1 2610 struct btrfs_ordered_extent *ordered;
aa42ffd9
LB		 2611 lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2612 ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
9a019196 2613 if (!ordered &&
aa42ffd9
LB		 2614 !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
2615 EXTENT_DELALLOC, 0, NULL))
f46b5a66 2616 break;
aa42ffd9 2617 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
ae01a0ab
YZ		 2618 if (ordered)
2619 btrfs_put_ordered_extent(ordered);
9a019196 2620 btrfs_wait_ordered_range(src, off, len);
f46b5a66
CH		 2621 }
2622
c5c9cd4d 2623 /* clone data */
33345d01 2624 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2625 key.type = BTRFS_EXTENT_DATA_KEY;
2626 key.offset = 0;
f46b5a66
CH		 2627
2628 while (1) {
2629 /*
2630 * note the key will change type as we walk through the
2631 * tree.
2632 */
362a20c5
DS		 2633 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2634 0, 0);
f46b5a66
CH		 2635 if (ret < 0)
2636 goto out;
2637
ae01a0ab
YZ		 2638 nritems = btrfs_header_nritems(path->nodes[0]);
2639 if (path->slots[0] >= nritems) {
362a20c5 2640 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2641 if (ret < 0)
2642 goto out;
2643 if (ret > 0)
2644 break;
ae01a0ab 2645 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2646 }
2647 leaf = path->nodes[0];
2648 slot = path->slots[0];
f46b5a66 2649
ae01a0ab 2650 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 2651 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 2652 key.objectid != btrfs_ino(src))
f46b5a66
CH		 2653 break;
2654
c5c9cd4d
SW		 2655 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2656 struct btrfs_file_extent_item *extent;
2657 int type;
31840ae1
ZY		 2658 u32 size;
2659 struct btrfs_key new_key;
c5c9cd4d
SW		 2660 u64 disko = 0, diskl = 0;
2661 u64 datao = 0, datal = 0;
2662 u8 comp;
b5384d48 2663 u64 endoff;
31840ae1
ZY		 2664
2665 size = btrfs_item_size_nr(leaf, slot);
2666 read_extent_buffer(leaf, buf,
2667 btrfs_item_ptr_offset(leaf, slot),
2668 size);
c5c9cd4d
SW		 2669
2670 extent = btrfs_item_ptr(leaf, slot,
2671 struct btrfs_file_extent_item);
2672 comp = btrfs_file_extent_compression(leaf, extent);
2673 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 2674 if (type == BTRFS_FILE_EXTENT_REG ||
2675 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 2676 disko = btrfs_file_extent_disk_bytenr(leaf,
2677 extent);
2678 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2679 extent);
c5c9cd4d 2680 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 2681 datal = btrfs_file_extent_num_bytes(leaf,
2682 extent);
c5c9cd4d
SW		 2683 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2684 /* take upper bound, may be compressed */
2685 datal = btrfs_file_extent_ram_bytes(leaf,
2686 extent);
2687 }
b3b4aa74 2688 btrfs_release_path(path);
31840ae1 2689
050006a7 2690 if (key.offset + datal <= off ||
aa42ffd9 2691 key.offset >= off + len - 1)
c5c9cd4d
SW		 2692 goto next;
2693
31840ae1 2694 memcpy(&new_key, &key, sizeof(new_key));
33345d01 2695 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 2696 if (off <= key.offset)
2697 new_key.offset = key.offset + destoff - off;
2698 else
2699 new_key.offset = destoff;
31840ae1 2700
b6f3409b
SW		 2701 /*
2702 * 1 - adjusting old extent (we may have to split it)
2703 * 1 - add new extent
2704 * 1 - inode update
2705 */
2706 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 2707 if (IS_ERR(trans)) {
2708 ret = PTR_ERR(trans);
2709 goto out;
2710 }
2711
c8a894d7
CM		 2712 if (type == BTRFS_FILE_EXTENT_REG ||
2713 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 2714 /*
2715 * a | --- range to clone ---| b
2716 * | ------------- extent ------------- |
2717 */
2718
2719 /* substract range b */
2720 if (key.offset + datal > off + len)
2721 datal = off + len - key.offset;
2722
2723 /* substract range a */
a22285a6
YZ		 2724 if (off > key.offset) {
2725 datao += off - key.offset;
2726 datal -= off - key.offset;
2727 }
2728
5dc562c5 2729 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2730 new_key.offset,
2731 new_key.offset + datal,
2671485d 2732 1);
79787eaa
JM		 2733 if (ret) {
2734 btrfs_abort_transaction(trans, root,
2735 ret);
2736 btrfs_end_transaction(trans, root);
2737 goto out;
2738 }
a22285a6 2739
c5c9cd4d
SW		 2740 ret = btrfs_insert_empty_item(trans, root, path,
2741 &new_key, size);
79787eaa
JM		 2742 if (ret) {
2743 btrfs_abort_transaction(trans, root,
2744 ret);
2745 btrfs_end_transaction(trans, root);
2746 goto out;
2747 }
c5c9cd4d
SW		 2748
2749 leaf = path->nodes[0];
2750 slot = path->slots[0];
2751 write_extent_buffer(leaf, buf,
31840ae1
ZY		 2752 btrfs_item_ptr_offset(leaf, slot),
2753 size);
ae01a0ab 2754
c5c9cd4d 2755 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 2756 struct btrfs_file_extent_item);
c5c9cd4d 2757
c5c9cd4d
SW		 2758 /* disko == 0 means it's a hole */
2759 if (!disko)
2760 datao = 0;
c5c9cd4d
SW		 2761
2762 btrfs_set_file_extent_offset(leaf, extent,
2763 datao);
2764 btrfs_set_file_extent_num_bytes(leaf, extent,
2765 datal);
2766 if (disko) {
2767 inode_add_bytes(inode, datal);
ae01a0ab 2768 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 2769 disko, diskl, 0,
2770 root->root_key.objectid,
33345d01 2771 btrfs_ino(inode),
66d7e7f0
AJ		 2772 new_key.offset - datao,
2773 0);
79787eaa
JM		 2774 if (ret) {
2775 btrfs_abort_transaction(trans,
2776 root,
2777 ret);
2778 btrfs_end_transaction(trans,
2779 root);
2780 goto out;
2781
2782 }
f46b5a66 2783 }
c5c9cd4d
SW		 2784 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2785 u64 skip = 0;
2786 u64 trim = 0;
2787 if (off > key.offset) {
2788 skip = off - key.offset;
2789 new_key.offset += skip;
2790 }
d397712b 2791
aa42ffd9
LB		 2792 if (key.offset + datal > off + len)
2793 trim = key.offset + datal - (off + len);
d397712b 2794
c5c9cd4d 2795 if (comp && (skip || trim)) {
c5c9cd4d 2796 ret = -EINVAL;
a22285a6 2797 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 2798 goto out;
2799 }
2800 size -= skip + trim;
2801 datal -= skip + trim;
a22285a6 2802
5dc562c5 2803 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2804 new_key.offset,
2805 new_key.offset + datal,
2671485d 2806 1);
79787eaa
JM		 2807 if (ret) {
2808 btrfs_abort_transaction(trans, root,
2809 ret);
2810 btrfs_end_transaction(trans, root);
2811 goto out;
2812 }
a22285a6 2813
c5c9cd4d
SW		 2814 ret = btrfs_insert_empty_item(trans, root, path,
2815 &new_key, size);
79787eaa
JM		 2816 if (ret) {
2817 btrfs_abort_transaction(trans, root,
2818 ret);
2819 btrfs_end_transaction(trans, root);
2820 goto out;
2821 }
c5c9cd4d
SW		 2822
2823 if (skip) {
d397712b
CM		 2824 u32 start =
2825 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 2826 memmove(buf+start, buf+start+skip,
2827 datal);
2828 }
2829
2830 leaf = path->nodes[0];
2831 slot = path->slots[0];
2832 write_extent_buffer(leaf, buf,
2833 btrfs_item_ptr_offset(leaf, slot),
2834 size);
2835 inode_add_bytes(inode, datal);
f46b5a66 2836 }
c5c9cd4d
SW		 2837
2838 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 2839 btrfs_release_path(path);
c5c9cd4d 2840
0c4d2d95 2841 inode_inc_iversion(inode);
a22285a6 2842 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 2843
2844 /*
2845 * we round up to the block size at eof when
2846 * determining which extents to clone above,
2847 * but shouldn't round up the file size
2848 */
2849 endoff = new_key.offset + datal;
5f3888ff
LZ		 2850 if (endoff > destoff+olen)
2851 endoff = destoff+olen;
b5384d48
SW		 2852 if (endoff > inode->i_size)
2853 btrfs_i_size_write(inode, endoff);
2854
a22285a6 2855 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 2856 if (ret) {
2857 btrfs_abort_transaction(trans, root, ret);
2858 btrfs_end_transaction(trans, root);
2859 goto out;
2860 }
2861 ret = btrfs_end_transaction(trans, root);
a22285a6 2862 }
d397712b 2863next:
b3b4aa74 2864 btrfs_release_path(path);
f46b5a66 2865 key.offset++;
f46b5a66 2866 }
f46b5a66
CH		 2867 ret = 0;
2868out:
b3b4aa74 2869 btrfs_release_path(path);
aa42ffd9 2870 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66
CH		 2871out_unlock:
2872 mutex_unlock(&src->i_mutex);
2873 mutex_unlock(&inode->i_mutex);
ae01a0ab
YZ		 2874 vfree(buf);
2875 btrfs_free_path(path);
f46b5a66 2876out_fput:
2903ff01 2877 fdput(src_file);
ab67b7c1 2878out_drop_write:
2a79f17e 2879 mnt_drop_write_file(file);
f46b5a66
CH		 2880 return ret;
2881}
2882
7a865e8a 2883static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 2884{
2885 struct btrfs_ioctl_clone_range_args args;
2886
7a865e8a 2887 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 2888 return -EFAULT;
2889 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2890 args.src_length, args.dest_offset);
2891}
2892
f46b5a66
CH		 2893/*
2894 * there are many ways the trans_start and trans_end ioctls can lead
2895 * to deadlocks. They should only be used by applications that
2896 * basically own the machine, and have a very in depth understanding
2897 * of all the possible deadlocks and enospc problems.
2898 */
b2950863 2899static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66 2900{
496ad9aa 2901 struct inode *inode = file_inode(file);
f46b5a66
CH		 2902 struct btrfs_root *root = BTRFS_I(inode)->root;
2903 struct btrfs_trans_handle *trans;
1ab86aed 2904 int ret;
f46b5a66 2905
1ab86aed 2906 ret = -EPERM;
df5b5520 2907 if (!capable(CAP_SYS_ADMIN))
1ab86aed 2908 goto out;
df5b5520 2909
1ab86aed
SW		 2910 ret = -EINPROGRESS;
2911 if (file->private_data)
f46b5a66 2912 goto out;
9ca9ee09 2913
b83cc969
LZ		 2914 ret = -EROFS;
2915 if (btrfs_root_readonly(root))
2916 goto out;
2917
a561be71 2918 ret = mnt_want_write_file(file);
c146afad
YZ		 2919 if (ret)
2920 goto out;
2921
a4abeea4 2922 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 2923
1ab86aed 2924 ret = -ENOMEM;
7a7eaa40 2925 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 2926 if (IS_ERR(trans))
1ab86aed
SW		 2927 goto out_drop;
2928
2929 file->private_data = trans;
2930 return 0;
2931
2932out_drop:
a4abeea4 2933 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 2934 mnt_drop_write_file(file);
f46b5a66 2935out:
f46b5a66
CH		 2936 return ret;
2937}
2938
6ef5ed0d
JB		 2939static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2940{
496ad9aa 2941 struct inode *inode = file_inode(file);
6ef5ed0d
JB		 2942 struct btrfs_root *root = BTRFS_I(inode)->root;
2943 struct btrfs_root *new_root;
2944 struct btrfs_dir_item *di;
2945 struct btrfs_trans_handle *trans;
2946 struct btrfs_path *path;
2947 struct btrfs_key location;
2948 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 2949 u64 objectid = 0;
2950 u64 dir_id;
3c04ce01 2951 int ret;
6ef5ed0d
JB		 2952
2953 if (!capable(CAP_SYS_ADMIN))
2954 return -EPERM;
2955
3c04ce01
MX		 2956 ret = mnt_want_write_file(file);
2957 if (ret)
2958 return ret;
2959
2960 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
2961 ret = -EFAULT;
2962 goto out;
2963 }
6ef5ed0d
JB		 2964
2965 if (!objectid)
2966 objectid = root->root_key.objectid;
2967
2968 location.objectid = objectid;
2969 location.type = BTRFS_ROOT_ITEM_KEY;
2970 location.offset = (u64)-1;
2971
2972 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3c04ce01
MX		 2973 if (IS_ERR(new_root)) {
2974 ret = PTR_ERR(new_root);
2975 goto out;
2976 }
827a5cb0 2977 if (!is_fstree(new_root->objectid)) {
2978 ret = -ENOENT;
2979 goto out;
2980 }
6ef5ed0d 2981
3c04ce01
MX		 2982 if (btrfs_root_refs(&new_root->root_item) == 0) {
2983 ret = -ENOENT;
2984 goto out;
2985 }
6ef5ed0d
JB		 2986
2987 path = btrfs_alloc_path();
3c04ce01
MX		 2988 if (!path) {
2989 ret = -ENOMEM;
2990 goto out;
2991 }
6ef5ed0d
JB		 2992 path->leave_spinning = 1;
2993
2994 trans = btrfs_start_transaction(root, 1);
98d5dc13 2995 if (IS_ERR(trans)) {
6ef5ed0d 2996 btrfs_free_path(path);
3c04ce01
MX		 2997 ret = PTR_ERR(trans);
2998 goto out;
6ef5ed0d
JB		 2999 }
3000
6c41761f 3001 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 3002 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3003 dir_id, "default", 7, 1);
cf1e99a4 3004 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 3005 btrfs_free_path(path);
3006 btrfs_end_transaction(trans, root);
3007 printk(KERN_ERR "Umm, you don't have the default dir item, "
3008 "this isn't going to work\n");
3c04ce01
MX		 3009 ret = -ENOENT;
3010 goto out;
6ef5ed0d
JB		 3011 }
3012
3013 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3014 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3015 btrfs_mark_buffer_dirty(path->nodes[0]);
3016 btrfs_free_path(path);
3017
2b0ce2c2 3018 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d 3019 btrfs_end_transaction(trans, root);
3c04ce01
MX		 3020out:
3021 mnt_drop_write_file(file);
3022 return ret;
6ef5ed0d
JB		 3023}
3024
5af3e8cc
SB		 3025void btrfs_get_block_group_info(struct list_head *groups_list,
3026 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 3027{
3028 struct btrfs_block_group_cache *block_group;
3029
3030 space->total_bytes = 0;
3031 space->used_bytes = 0;
3032 space->flags = 0;
3033 list_for_each_entry(block_group, groups_list, list) {
3034 space->flags = block_group->flags;
3035 space->total_bytes += block_group->key.offset;
3036 space->used_bytes +=
3037 btrfs_block_group_used(&block_group->item);
3038 }
3039}
3040
48a3b636 3041static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1406e432
JB		 3042{
3043 struct btrfs_ioctl_space_args space_args;
3044 struct btrfs_ioctl_space_info space;
3045 struct btrfs_ioctl_space_info *dest;
7fde62bf 3046 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 3047 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 3048 struct btrfs_space_info *info;
bf5fc093
JB		 3049 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3050 BTRFS_BLOCK_GROUP_SYSTEM,
3051 BTRFS_BLOCK_GROUP_METADATA,
3052 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3053 int num_types = 4;
7fde62bf 3054 int alloc_size;
1406e432 3055 int ret = 0;
51788b1b 3056 u64 slot_count = 0;
bf5fc093 3057 int i, c;
1406e432
JB		 3058
3059 if (copy_from_user(&space_args,
3060 (struct btrfs_ioctl_space_args __user *)arg,
3061 sizeof(space_args)))
3062 return -EFAULT;
3063
bf5fc093
JB		 3064 for (i = 0; i < num_types; i++) {
3065 struct btrfs_space_info *tmp;
3066
3067 info = NULL;
3068 rcu_read_lock();
3069 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3070 list) {
3071 if (tmp->flags == types[i]) {
3072 info = tmp;
3073 break;
3074 }
3075 }
3076 rcu_read_unlock();
3077
3078 if (!info)
3079 continue;
3080
3081 down_read(&info->groups_sem);
3082 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3083 if (!list_empty(&info->block_groups[c]))
3084 slot_count++;
3085 }
3086 up_read(&info->groups_sem);
3087 }
7fde62bf
CM		 3088
3089 /* space_slots == 0 means they are asking for a count */
3090 if (space_args.space_slots == 0) {
3091 space_args.total_spaces = slot_count;
3092 goto out;
3093 }
bf5fc093 3094
51788b1b 3095 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 3096
7fde62bf 3097 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 3098
7fde62bf
CM		 3099 /* we generally have at most 6 or so space infos, one for each raid
3100 * level. So, a whole page should be more than enough for everyone
3101 */
3102 if (alloc_size > PAGE_CACHE_SIZE)
3103 return -ENOMEM;
3104
1406e432 3105 space_args.total_spaces = 0;
7fde62bf
CM		 3106 dest = kmalloc(alloc_size, GFP_NOFS);
3107 if (!dest)
3108 return -ENOMEM;
3109 dest_orig = dest;
1406e432 3110
7fde62bf 3111 /* now we have a buffer to copy into */
bf5fc093
JB		 3112 for (i = 0; i < num_types; i++) {
3113 struct btrfs_space_info *tmp;
3114
51788b1b
DR		 3115 if (!slot_count)
3116 break;
3117
bf5fc093
JB		 3118 info = NULL;
3119 rcu_read_lock();
3120 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3121 list) {
3122 if (tmp->flags == types[i]) {
3123 info = tmp;
3124 break;
3125 }
3126 }
3127 rcu_read_unlock();
7fde62bf 3128
bf5fc093
JB		 3129 if (!info)
3130 continue;
3131 down_read(&info->groups_sem);
3132 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3133 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 3134 btrfs_get_block_group_info(
3135 &info->block_groups[c], &space);
bf5fc093
JB		 3136 memcpy(dest, &space, sizeof(space));
3137 dest++;
3138 space_args.total_spaces++;
51788b1b 3139 slot_count--;
bf5fc093 3140 }
51788b1b
DR		 3141 if (!slot_count)
3142 break;
bf5fc093
JB		 3143 }
3144 up_read(&info->groups_sem);
1406e432 3145 }
1406e432 3146
2eec6c81 3147 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3148 (arg + sizeof(struct btrfs_ioctl_space_args));
3149
3150 if (copy_to_user(user_dest, dest_orig, alloc_size))
3151 ret = -EFAULT;
3152
3153 kfree(dest_orig);
3154out:
3155 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3156 ret = -EFAULT;
3157
3158 return ret;
3159}
3160
f46b5a66
CH		 3161/*
3162 * there are many ways the trans_start and trans_end ioctls can lead
3163 * to deadlocks. They should only be used by applications that
3164 * basically own the machine, and have a very in depth understanding
3165 * of all the possible deadlocks and enospc problems.
3166 */
3167long btrfs_ioctl_trans_end(struct file *file)
3168{
496ad9aa 3169 struct inode *inode = file_inode(file);
f46b5a66
CH		 3170 struct btrfs_root *root = BTRFS_I(inode)->root;
3171 struct btrfs_trans_handle *trans;
f46b5a66 3172
f46b5a66 3173 trans = file->private_data;
1ab86aed
SW		 3174 if (!trans)
3175 return -EINVAL;
b214107e 3176 file->private_data = NULL;
9ca9ee09 3177
1ab86aed
SW		 3178 btrfs_end_transaction(trans, root);
3179
a4abeea4 3180 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3181
2a79f17e 3182 mnt_drop_write_file(file);
1ab86aed 3183 return 0;
f46b5a66
CH		 3184}
3185
9a8c28be
MX		 3186static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3187 void __user *argp)
46204592 3188{
46204592
SW		 3189 struct btrfs_trans_handle *trans;
3190 u64 transid;
db5b493a 3191 int ret;
46204592 3192
d4edf39b 3193 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 3194 if (IS_ERR(trans)) {
3195 if (PTR_ERR(trans) != -ENOENT)
3196 return PTR_ERR(trans);
3197
3198 /* No running transaction, don't bother */
3199 transid = root->fs_info->last_trans_committed;
3200 goto out;
3201 }
46204592 3202 transid = trans->transid;
db5b493a 3203 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3204 if (ret) {
3205 btrfs_end_transaction(trans, root);
db5b493a 3206 return ret;
8b2b2d3c 3207 }
ff7c1d33 3208out:
46204592
SW		 3209 if (argp)
3210 if (copy_to_user(argp, &transid, sizeof(transid)))
3211 return -EFAULT;
3212 return 0;
3213}
3214
9a8c28be
MX		 3215static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3216 void __user *argp)
46204592 3217{
46204592
SW		 3218 u64 transid;
3219
3220 if (argp) {
3221 if (copy_from_user(&transid, argp, sizeof(transid)))
3222 return -EFAULT;
3223 } else {
3224 transid = 0; /* current trans */
3225 }
3226 return btrfs_wait_for_commit(root, transid);
3227}
3228
b8e95489 3229static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 3230{
496ad9aa 3231 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
475f6387 3232 struct btrfs_ioctl_scrub_args *sa;
b8e95489 3233 int ret;
475f6387
JS		 3234
3235 if (!capable(CAP_SYS_ADMIN))
3236 return -EPERM;
3237
3238 sa = memdup_user(arg, sizeof(*sa));
3239 if (IS_ERR(sa))
3240 return PTR_ERR(sa);
3241
b8e95489
MX		 3242 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3243 ret = mnt_want_write_file(file);
3244 if (ret)
3245 goto out;
3246 }
3247
aa1b8cd4 3248 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 3249 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3250 0);
475f6387
JS		 3251
3252 if (copy_to_user(arg, sa, sizeof(*sa)))
3253 ret = -EFAULT;
3254
b8e95489
MX		 3255 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3256 mnt_drop_write_file(file);
3257out:
475f6387
JS		 3258 kfree(sa);
3259 return ret;
3260}
3261
3262static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3263{
3264 if (!capable(CAP_SYS_ADMIN))
3265 return -EPERM;
3266
aa1b8cd4 3267 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3268}
3269
3270static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3271 void __user *arg)
3272{
3273 struct btrfs_ioctl_scrub_args *sa;
3274 int ret;
3275
3276 if (!capable(CAP_SYS_ADMIN))
3277 return -EPERM;
3278
3279 sa = memdup_user(arg, sizeof(*sa));
3280 if (IS_ERR(sa))
3281 return PTR_ERR(sa);
3282
3283 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3284
3285 if (copy_to_user(arg, sa, sizeof(*sa)))
3286 ret = -EFAULT;
3287
3288 kfree(sa);
3289 return ret;
3290}
3291
c11d2c23 3292static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3293 void __user *arg)
c11d2c23
SB		 3294{
3295 struct btrfs_ioctl_get_dev_stats *sa;
3296 int ret;
3297
c11d2c23
SB		 3298 sa = memdup_user(arg, sizeof(*sa));
3299 if (IS_ERR(sa))
3300 return PTR_ERR(sa);
3301
b27f7c0c
DS		 3302 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3303 kfree(sa);
3304 return -EPERM;
3305 }
3306
3307 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3308
3309 if (copy_to_user(arg, sa, sizeof(*sa)))
3310 ret = -EFAULT;
3311
3312 kfree(sa);
3313 return ret;
3314}
3315
3f6bcfbd
SB		 3316static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3317{
3318 struct btrfs_ioctl_dev_replace_args *p;
3319 int ret;
3320
3321 if (!capable(CAP_SYS_ADMIN))
3322 return -EPERM;
3323
3324 p = memdup_user(arg, sizeof(*p));
3325 if (IS_ERR(p))
3326 return PTR_ERR(p);
3327
3328 switch (p->cmd) {
3329 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
42cc8e56
SB		 3330 if (root->fs_info->sb->s_flags & MS_RDONLY)
3331 return -EROFS;
3332
3f6bcfbd
SB		 3333 if (atomic_xchg(
3334 &root->fs_info->mutually_exclusive_operation_running,
3335 1)) {
3336 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3337 ret = -EINPROGRESS;
3338 } else {
3339 ret = btrfs_dev_replace_start(root, p);
3340 atomic_set(
3341 &root->fs_info->mutually_exclusive_operation_running,
3342 0);
3343 }
3344 break;
3345 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3346 btrfs_dev_replace_status(root->fs_info, p);
3347 ret = 0;
3348 break;
3349 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3350 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3351 break;
3352 default:
3353 ret = -EINVAL;
3354 break;
3355 }
3356
3357 if (copy_to_user(arg, p, sizeof(*p)))
3358 ret = -EFAULT;
3359
3360 kfree(p);
3361 return ret;
3362}
3363
d7728c96
JS		 3364static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3365{
3366 int ret = 0;
3367 int i;
740c3d22 3368 u64 rel_ptr;
d7728c96 3369 int size;
806468f8 3370 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3371 struct inode_fs_paths *ipath = NULL;
3372 struct btrfs_path *path;
3373
82b22ac8 3374 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 3375 return -EPERM;
3376
3377 path = btrfs_alloc_path();
3378 if (!path) {
3379 ret = -ENOMEM;
3380 goto out;
3381 }
3382
3383 ipa = memdup_user(arg, sizeof(*ipa));
3384 if (IS_ERR(ipa)) {
3385 ret = PTR_ERR(ipa);
3386 ipa = NULL;
3387 goto out;
3388 }
3389
3390 size = min_t(u32, ipa->size, 4096);
3391 ipath = init_ipath(size, root, path);
3392 if (IS_ERR(ipath)) {
3393 ret = PTR_ERR(ipath);
3394 ipath = NULL;
3395 goto out;
3396 }
3397
3398 ret = paths_from_inode(ipa->inum, ipath);
3399 if (ret < 0)
3400 goto out;
3401
3402 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3403 rel_ptr = ipath->fspath->val[i] -
3404 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3405 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3406 }
3407
745c4d8e
JM		 3408 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3409 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3410 if (ret) {
3411 ret = -EFAULT;
3412 goto out;
3413 }
3414
3415out:
3416 btrfs_free_path(path);
3417 free_ipath(ipath);
3418 kfree(ipa);
3419
3420 return ret;
3421}
3422
3423static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3424{
3425 struct btrfs_data_container *inodes = ctx;
3426 const size_t c = 3 * sizeof(u64);
3427
3428 if (inodes->bytes_left >= c) {
3429 inodes->bytes_left -= c;
3430 inodes->val[inodes->elem_cnt] = inum;
3431 inodes->val[inodes->elem_cnt + 1] = offset;
3432 inodes->val[inodes->elem_cnt + 2] = root;
3433 inodes->elem_cnt += 3;
3434 } else {
3435 inodes->bytes_missing += c - inodes->bytes_left;
3436 inodes->bytes_left = 0;
3437 inodes->elem_missed += 3;
3438 }
3439
3440 return 0;
3441}
3442
3443static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3444 void __user *arg)
3445{
3446 int ret = 0;
3447 int size;
d7728c96
JS		 3448 struct btrfs_ioctl_logical_ino_args *loi;
3449 struct btrfs_data_container *inodes = NULL;
3450 struct btrfs_path *path = NULL;
d7728c96
JS		 3451
3452 if (!capable(CAP_SYS_ADMIN))
3453 return -EPERM;
3454
3455 loi = memdup_user(arg, sizeof(*loi));
3456 if (IS_ERR(loi)) {
3457 ret = PTR_ERR(loi);
3458 loi = NULL;
3459 goto out;
3460 }
3461
3462 path = btrfs_alloc_path();
3463 if (!path) {
3464 ret = -ENOMEM;
3465 goto out;
3466 }
3467
425d17a2 3468 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3469 inodes = init_data_container(size);
3470 if (IS_ERR(inodes)) {
3471 ret = PTR_ERR(inodes);
3472 inodes = NULL;
3473 goto out;
3474 }
3475
df031f07
LB		 3476 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3477 build_ino_list, inodes);
3478 if (ret == -EINVAL)
d7728c96
JS		 3479 ret = -ENOENT;
3480 if (ret < 0)
3481 goto out;
3482
745c4d8e
JM		 3483 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3484 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3485 if (ret)
3486 ret = -EFAULT;
3487
3488out:
3489 btrfs_free_path(path);
425d17a2 3490 vfree(inodes);
d7728c96
JS		 3491 kfree(loi);
3492
3493 return ret;
3494}
3495
19a39dce 3496void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3497 struct btrfs_ioctl_balance_args *bargs)
3498{
3499 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3500
3501 bargs->flags = bctl->flags;
3502
837d5b6e
ID		 3503 if (atomic_read(&fs_info->balance_running))
3504 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3505 if (atomic_read(&fs_info->balance_pause_req))
3506 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3507 if (atomic_read(&fs_info->balance_cancel_req))
3508 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3509
c9e9f97b
ID		 3510 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3511 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3512 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3513
3514 if (lock) {
3515 spin_lock(&fs_info->balance_lock);
3516 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3517 spin_unlock(&fs_info->balance_lock);
3518 } else {
3519 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3520 }
c9e9f97b
ID		 3521}
3522
9ba1f6e4 3523static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 3524{
496ad9aa 3525 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 3526 struct btrfs_fs_info *fs_info = root->fs_info;
3527 struct btrfs_ioctl_balance_args *bargs;
3528 struct btrfs_balance_control *bctl;
ed0fb78f 3529 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 3530 int ret;
3531
3532 if (!capable(CAP_SYS_ADMIN))
3533 return -EPERM;
3534
e54bfa31 3535 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 3536 if (ret)
3537 return ret;
3538
ed0fb78f
ID		 3539again:
3540 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
3541 mutex_lock(&fs_info->volume_mutex);
3542 mutex_lock(&fs_info->balance_mutex);
3543 need_unlock = true;
3544 goto locked;
3545 }
3546
3547 /*
3548 * mut. excl. ops lock is locked. Three possibilites:
3549 * (1) some other op is running
3550 * (2) balance is running
3551 * (3) balance is paused -- special case (think resume)
3552 */
c9e9f97b 3553 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 3554 if (fs_info->balance_ctl) {
3555 /* this is either (2) or (3) */
3556 if (!atomic_read(&fs_info->balance_running)) {
3557 mutex_unlock(&fs_info->balance_mutex);
3558 if (!mutex_trylock(&fs_info->volume_mutex))
3559 goto again;
3560 mutex_lock(&fs_info->balance_mutex);
3561
3562 if (fs_info->balance_ctl &&
3563 !atomic_read(&fs_info->balance_running)) {
3564 /* this is (3) */
3565 need_unlock = false;
3566 goto locked;
3567 }
3568
3569 mutex_unlock(&fs_info->balance_mutex);
3570 mutex_unlock(&fs_info->volume_mutex);
3571 goto again;
3572 } else {
3573 /* this is (2) */
3574 mutex_unlock(&fs_info->balance_mutex);
3575 ret = -EINPROGRESS;
3576 goto out;
3577 }
3578 } else {
3579 /* this is (1) */
3580 mutex_unlock(&fs_info->balance_mutex);
3581 pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n");
3582 ret = -EINVAL;
3583 goto out;
3584 }
3585
3586locked:
3587 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
c9e9f97b
ID		 3588
3589 if (arg) {
3590 bargs = memdup_user(arg, sizeof(*bargs));
3591 if (IS_ERR(bargs)) {
3592 ret = PTR_ERR(bargs);
ed0fb78f 3593 goto out_unlock;
c9e9f97b 3594 }
de322263
ID		 3595
3596 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3597 if (!fs_info->balance_ctl) {
3598 ret = -ENOTCONN;
3599 goto out_bargs;
3600 }
3601
3602 bctl = fs_info->balance_ctl;
3603 spin_lock(&fs_info->balance_lock);
3604 bctl->flags |= BTRFS_BALANCE_RESUME;
3605 spin_unlock(&fs_info->balance_lock);
3606
3607 goto do_balance;
3608 }
c9e9f97b
ID		 3609 } else {
3610 bargs = NULL;
3611 }
3612
ed0fb78f 3613 if (fs_info->balance_ctl) {
837d5b6e
ID		 3614 ret = -EINPROGRESS;
3615 goto out_bargs;
3616 }
3617
c9e9f97b
ID		 3618 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3619 if (!bctl) {
3620 ret = -ENOMEM;
3621 goto out_bargs;
3622 }
3623
3624 bctl->fs_info = fs_info;
3625 if (arg) {
3626 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3627 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3628 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3629
3630 bctl->flags = bargs->flags;
f43ffb60
ID		 3631 } else {
3632 /* balance everything - no filters */
3633 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 3634 }
3635
de322263 3636do_balance:
c9e9f97b 3637 /*
ed0fb78f
ID		 3638 * Ownership of bctl and mutually_exclusive_operation_running
3639 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
3640 * or, if restriper was paused all the way until unmount, in
3641 * free_fs_info. mutually_exclusive_operation_running is
3642 * cleared in __cancel_balance.
c9e9f97b 3643 */
ed0fb78f
ID		 3644 need_unlock = false;
3645
3646 ret = btrfs_balance(bctl, bargs);
3647
c9e9f97b
ID		 3648 if (arg) {
3649 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3650 ret = -EFAULT;
3651 }
3652
3653out_bargs:
3654 kfree(bargs);
ed0fb78f 3655out_unlock:
c9e9f97b
ID		 3656 mutex_unlock(&fs_info->balance_mutex);
3657 mutex_unlock(&fs_info->volume_mutex);
ed0fb78f
ID		 3658 if (need_unlock)
3659 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3660out:
e54bfa31 3661 mnt_drop_write_file(file);
c9e9f97b
ID		 3662 return ret;
3663}
3664
837d5b6e
ID		 3665static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3666{
3667 if (!capable(CAP_SYS_ADMIN))
3668 return -EPERM;
3669
3670 switch (cmd) {
3671 case BTRFS_BALANCE_CTL_PAUSE:
3672 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 3673 case BTRFS_BALANCE_CTL_CANCEL:
3674 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 3675 }
3676
3677 return -EINVAL;
3678}
3679
19a39dce
ID		 3680static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3681 void __user *arg)
3682{
3683 struct btrfs_fs_info *fs_info = root->fs_info;
3684 struct btrfs_ioctl_balance_args *bargs;
3685 int ret = 0;
3686
3687 if (!capable(CAP_SYS_ADMIN))
3688 return -EPERM;
3689
3690 mutex_lock(&fs_info->balance_mutex);
3691 if (!fs_info->balance_ctl) {
3692 ret = -ENOTCONN;
3693 goto out;
3694 }
3695
3696 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3697 if (!bargs) {
3698 ret = -ENOMEM;
3699 goto out;
3700 }
3701
3702 update_ioctl_balance_args(fs_info, 1, bargs);
3703
3704 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3705 ret = -EFAULT;
3706
3707 kfree(bargs);
3708out:
3709 mutex_unlock(&fs_info->balance_mutex);
3710 return ret;
3711}
3712
905b0dda 3713static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 3714{
496ad9aa 3715 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 3716 struct btrfs_ioctl_quota_ctl_args *sa;
3717 struct btrfs_trans_handle *trans = NULL;
3718 int ret;
3719 int err;
3720
3721 if (!capable(CAP_SYS_ADMIN))
3722 return -EPERM;
3723
905b0dda
MX		 3724 ret = mnt_want_write_file(file);
3725 if (ret)
3726 return ret;
5d13a37b
AJ		 3727
3728 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 3729 if (IS_ERR(sa)) {
3730 ret = PTR_ERR(sa);
3731 goto drop_write;
3732 }
5d13a37b 3733
7708f029 3734 down_write(&root->fs_info->subvol_sem);
2f232036
JS		 3735 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
3736 if (IS_ERR(trans)) {
3737 ret = PTR_ERR(trans);
3738 goto out;
5d13a37b
AJ		 3739 }
3740
3741 switch (sa->cmd) {
3742 case BTRFS_QUOTA_CTL_ENABLE:
3743 ret = btrfs_quota_enable(trans, root->fs_info);
3744 break;
3745 case BTRFS_QUOTA_CTL_DISABLE:
3746 ret = btrfs_quota_disable(trans, root->fs_info);
3747 break;
5d13a37b
AJ		 3748 default:
3749 ret = -EINVAL;
3750 break;
3751 }
3752
3753 if (copy_to_user(arg, sa, sizeof(*sa)))
3754 ret = -EFAULT;
3755
2f232036
JS		 3756 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
3757 if (err && !ret)
3758 ret = err;
5d13a37b
AJ		 3759out:
3760 kfree(sa);
7708f029 3761 up_write(&root->fs_info->subvol_sem);
905b0dda
MX		 3762drop_write:
3763 mnt_drop_write_file(file);
5d13a37b
AJ		 3764 return ret;
3765}
3766
905b0dda 3767static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 3768{
496ad9aa 3769 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 3770 struct btrfs_ioctl_qgroup_assign_args *sa;
3771 struct btrfs_trans_handle *trans;
3772 int ret;
3773 int err;
3774
3775 if (!capable(CAP_SYS_ADMIN))
3776 return -EPERM;
3777
905b0dda
MX		 3778 ret = mnt_want_write_file(file);
3779 if (ret)
3780 return ret;
5d13a37b
AJ		 3781
3782 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 3783 if (IS_ERR(sa)) {
3784 ret = PTR_ERR(sa);
3785 goto drop_write;
3786 }
5d13a37b
AJ		 3787
3788 trans = btrfs_join_transaction(root);
3789 if (IS_ERR(trans)) {
3790 ret = PTR_ERR(trans);
3791 goto out;
3792 }
3793
3794 /* FIXME: check if the IDs really exist */
3795 if (sa->assign) {
3796 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3797 sa->src, sa->dst);
3798 } else {
3799 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3800 sa->src, sa->dst);
3801 }
3802
3803 err = btrfs_end_transaction(trans, root);
3804 if (err && !ret)
3805 ret = err;
3806
3807out:
3808 kfree(sa);
905b0dda
MX		 3809drop_write:
3810 mnt_drop_write_file(file);
5d13a37b
AJ		 3811 return ret;
3812}
3813
905b0dda 3814static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 3815{
496ad9aa 3816 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 3817 struct btrfs_ioctl_qgroup_create_args *sa;
3818 struct btrfs_trans_handle *trans;
3819 int ret;
3820 int err;
3821
3822 if (!capable(CAP_SYS_ADMIN))
3823 return -EPERM;
3824
905b0dda
MX		 3825 ret = mnt_want_write_file(file);
3826 if (ret)
3827 return ret;
5d13a37b
AJ		 3828
3829 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 3830 if (IS_ERR(sa)) {
3831 ret = PTR_ERR(sa);
3832 goto drop_write;
3833 }
5d13a37b 3834
d86e56cf
MX		 3835 if (!sa->qgroupid) {
3836 ret = -EINVAL;
3837 goto out;
3838 }
3839
5d13a37b
AJ		 3840 trans = btrfs_join_transaction(root);
3841 if (IS_ERR(trans)) {
3842 ret = PTR_ERR(trans);
3843 goto out;
3844 }
3845
3846 /* FIXME: check if the IDs really exist */
3847 if (sa->create) {
3848 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3849 NULL);
3850 } else {
3851 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3852 }
3853
3854 err = btrfs_end_transaction(trans, root);
3855 if (err && !ret)
3856 ret = err;
3857
3858out:
3859 kfree(sa);
905b0dda
MX		 3860drop_write:
3861 mnt_drop_write_file(file);
5d13a37b
AJ		 3862 return ret;
3863}
3864
905b0dda 3865static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 3866{
496ad9aa 3867 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 3868 struct btrfs_ioctl_qgroup_limit_args *sa;
3869 struct btrfs_trans_handle *trans;
3870 int ret;
3871 int err;
3872 u64 qgroupid;
3873
3874 if (!capable(CAP_SYS_ADMIN))
3875 return -EPERM;
3876
905b0dda
MX		 3877 ret = mnt_want_write_file(file);
3878 if (ret)
3879 return ret;
5d13a37b
AJ		 3880
3881 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 3882 if (IS_ERR(sa)) {
3883 ret = PTR_ERR(sa);
3884 goto drop_write;
3885 }
5d13a37b
AJ		 3886
3887 trans = btrfs_join_transaction(root);
3888 if (IS_ERR(trans)) {
3889 ret = PTR_ERR(trans);
3890 goto out;
3891 }
3892
3893 qgroupid = sa->qgroupid;
3894 if (!qgroupid) {
3895 /* take the current subvol as qgroup */
3896 qgroupid = root->root_key.objectid;
3897 }
3898
3899 /* FIXME: check if the IDs really exist */
3900 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3901
3902 err = btrfs_end_transaction(trans, root);
3903 if (err && !ret)
3904 ret = err;
3905
3906out:
3907 kfree(sa);
905b0dda
MX		 3908drop_write:
3909 mnt_drop_write_file(file);
5d13a37b
AJ		 3910 return ret;
3911}
3912
2f232036
JS		 3913static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
3914{
3915 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3916 struct btrfs_ioctl_quota_rescan_args *qsa;
3917 int ret;
3918
3919 if (!capable(CAP_SYS_ADMIN))
3920 return -EPERM;
3921
3922 ret = mnt_want_write_file(file);
3923 if (ret)
3924 return ret;
3925
3926 qsa = memdup_user(arg, sizeof(*qsa));
3927 if (IS_ERR(qsa)) {
3928 ret = PTR_ERR(qsa);
3929 goto drop_write;
3930 }
3931
3932 if (qsa->flags) {
3933 ret = -EINVAL;
3934 goto out;
3935 }
3936
3937 ret = btrfs_qgroup_rescan(root->fs_info);
3938
3939out:
3940 kfree(qsa);
3941drop_write:
3942 mnt_drop_write_file(file);
3943 return ret;
3944}
3945
3946static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
3947{
3948 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3949 struct btrfs_ioctl_quota_rescan_args *qsa;
3950 int ret = 0;
3951
3952 if (!capable(CAP_SYS_ADMIN))
3953 return -EPERM;
3954
3955 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
3956 if (!qsa)
3957 return -ENOMEM;
3958
3959 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
3960 qsa->flags = 1;
3961 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
3962 }
3963
3964 if (copy_to_user(arg, qsa, sizeof(*qsa)))
3965 ret = -EFAULT;
3966
3967 kfree(qsa);
3968 return ret;
3969}
3970
8ea05e3a
AB		 3971static long btrfs_ioctl_set_received_subvol(struct file *file,
3972 void __user *arg)
3973{
3974 struct btrfs_ioctl_received_subvol_args *sa = NULL;
496ad9aa 3975 struct inode *inode = file_inode(file);
8ea05e3a
AB		 3976 struct btrfs_root *root = BTRFS_I(inode)->root;
3977 struct btrfs_root_item *root_item = &root->root_item;
3978 struct btrfs_trans_handle *trans;
3979 struct timespec ct = CURRENT_TIME;
3980 int ret = 0;
3981
3982 ret = mnt_want_write_file(file);
3983 if (ret < 0)
3984 return ret;
3985
3986 down_write(&root->fs_info->subvol_sem);
3987
3988 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
3989 ret = -EINVAL;
3990 goto out;
3991 }
3992
3993 if (btrfs_root_readonly(root)) {
3994 ret = -EROFS;
3995 goto out;
3996 }
3997
3998 if (!inode_owner_or_capable(inode)) {
3999 ret = -EACCES;
4000 goto out;
4001 }
4002
4003 sa = memdup_user(arg, sizeof(*sa));
4004 if (IS_ERR(sa)) {
4005 ret = PTR_ERR(sa);
4006 sa = NULL;
4007 goto out;
4008 }
4009
4010 trans = btrfs_start_transaction(root, 1);
4011 if (IS_ERR(trans)) {
4012 ret = PTR_ERR(trans);
4013 trans = NULL;
4014 goto out;
4015 }
4016
4017 sa->rtransid = trans->transid;
4018 sa->rtime.sec = ct.tv_sec;
4019 sa->rtime.nsec = ct.tv_nsec;
4020
4021 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4022 btrfs_set_root_stransid(root_item, sa->stransid);
4023 btrfs_set_root_rtransid(root_item, sa->rtransid);
4024 root_item->stime.sec = cpu_to_le64(sa->stime.sec);
4025 root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
4026 root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
4027 root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
4028
4029 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4030 &root->root_key, &root->root_item);
4031 if (ret < 0) {
4032 btrfs_end_transaction(trans, root);
4033 trans = NULL;
4034 goto out;
4035 } else {
4036 ret = btrfs_commit_transaction(trans, root);
4037 if (ret < 0)
4038 goto out;
4039 }
4040
4041 ret = copy_to_user(arg, sa, sizeof(*sa));
4042 if (ret)
4043 ret = -EFAULT;
4044
4045out:
4046 kfree(sa);
4047 up_write(&root->fs_info->subvol_sem);
4048 mnt_drop_write_file(file);
4049 return ret;
4050}
4051
867ab667 4052static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4053{
4054 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
4055 const char *label = root->fs_info->super_copy->label;
4056 size_t len = strnlen(label, BTRFS_LABEL_SIZE);
4057 int ret;
4058
4059 if (len == BTRFS_LABEL_SIZE) {
4060 pr_warn("btrfs: label is too long, return the first %zu bytes\n",
4061 --len);
4062 }
4063
4064 mutex_lock(&root->fs_info->volume_mutex);
4065 ret = copy_to_user(arg, label, len);
4066 mutex_unlock(&root->fs_info->volume_mutex);
4067
4068 return ret ? -EFAULT : 0;
4069}
4070
a8bfd4ab 4071static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4072{
4073 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
4074 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4075 struct btrfs_trans_handle *trans;
4076 char label[BTRFS_LABEL_SIZE];
4077 int ret;
4078
4079 if (!capable(CAP_SYS_ADMIN))
4080 return -EPERM;
4081
4082 if (copy_from_user(label, arg, sizeof(label)))
4083 return -EFAULT;
4084
4085 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4086 pr_err("btrfs: unable to set label with more than %d bytes\n",
4087 BTRFS_LABEL_SIZE - 1);
4088 return -EINVAL;
4089 }
4090
4091 ret = mnt_want_write_file(file);
4092 if (ret)
4093 return ret;
4094
4095 mutex_lock(&root->fs_info->volume_mutex);
4096 trans = btrfs_start_transaction(root, 0);
4097 if (IS_ERR(trans)) {
4098 ret = PTR_ERR(trans);
4099 goto out_unlock;
4100 }
4101
4102 strcpy(super_block->label, label);
4103 ret = btrfs_end_transaction(trans, root);
4104
4105out_unlock:
4106 mutex_unlock(&root->fs_info->volume_mutex);
4107 mnt_drop_write_file(file);
4108 return ret;
4109}
4110
f46b5a66
CH		 4111long btrfs_ioctl(struct file *file, unsigned int
4112 cmd, unsigned long arg)
4113{
496ad9aa 4114 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4bcabaa3 4115 void __user *argp = (void __user *)arg;
f46b5a66
CH		 4116
4117 switch (cmd) {
6cbff00f
CH		 4118 case FS_IOC_GETFLAGS:
4119 return btrfs_ioctl_getflags(file, argp);
4120 case FS_IOC_SETFLAGS:
4121 return btrfs_ioctl_setflags(file, argp);
4122 case FS_IOC_GETVERSION:
4123 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 4124 case FITRIM:
4125 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 4126 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 4127 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 4128 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 4129 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 4130 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 4131 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 4132 case BTRFS_IOC_SUBVOL_CREATE_V2:
4133 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 4134 case BTRFS_IOC_SNAP_DESTROY:
4135 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 4136 case BTRFS_IOC_SUBVOL_GETFLAGS:
4137 return btrfs_ioctl_subvol_getflags(file, argp);
4138 case BTRFS_IOC_SUBVOL_SETFLAGS:
4139 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 4140 case BTRFS_IOC_DEFAULT_SUBVOL:
4141 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 4142 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 4143 return btrfs_ioctl_defrag(file, NULL);
4144 case BTRFS_IOC_DEFRAG_RANGE:
4145 return btrfs_ioctl_defrag(file, argp);
f46b5a66 4146 case BTRFS_IOC_RESIZE:
198605a8 4147 return btrfs_ioctl_resize(file, argp);
f46b5a66 4148 case BTRFS_IOC_ADD_DEV:
4bcabaa3 4149 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 4150 case BTRFS_IOC_RM_DEV:
da24927b 4151 return btrfs_ioctl_rm_dev(file, argp);
475f6387
JS		 4152 case BTRFS_IOC_FS_INFO:
4153 return btrfs_ioctl_fs_info(root, argp);
4154 case BTRFS_IOC_DEV_INFO:
4155 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 4156 case BTRFS_IOC_BALANCE:
9ba1f6e4 4157 return btrfs_ioctl_balance(file, NULL);
f46b5a66 4158 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 4159 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4160 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 4161 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 4162 case BTRFS_IOC_TRANS_START:
4163 return btrfs_ioctl_trans_start(file);
4164 case BTRFS_IOC_TRANS_END:
4165 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 4166 case BTRFS_IOC_TREE_SEARCH:
4167 return btrfs_ioctl_tree_search(file, argp);
4168 case BTRFS_IOC_INO_LOOKUP:
4169 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 4170 case BTRFS_IOC_INO_PATHS:
4171 return btrfs_ioctl_ino_to_path(root, argp);
4172 case BTRFS_IOC_LOGICAL_INO:
4173 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 4174 case BTRFS_IOC_SPACE_INFO:
4175 return btrfs_ioctl_space_info(root, argp);
f46b5a66
CH		 4176 case BTRFS_IOC_SYNC:
4177 btrfs_sync_fs(file->f_dentry->d_sb, 1);
4178 return 0;
46204592 4179 case BTRFS_IOC_START_SYNC:
9a8c28be 4180 return btrfs_ioctl_start_sync(root, argp);
46204592 4181 case BTRFS_IOC_WAIT_SYNC:
9a8c28be 4182 return btrfs_ioctl_wait_sync(root, argp);
475f6387 4183 case BTRFS_IOC_SCRUB:
b8e95489 4184 return btrfs_ioctl_scrub(file, argp);
475f6387
JS		 4185 case BTRFS_IOC_SCRUB_CANCEL:
4186 return btrfs_ioctl_scrub_cancel(root, argp);
4187 case BTRFS_IOC_SCRUB_PROGRESS:
4188 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 4189 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 4190 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 4191 case BTRFS_IOC_BALANCE_CTL:
4192 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 4193 case BTRFS_IOC_BALANCE_PROGRESS:
4194 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 4195 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4196 return btrfs_ioctl_set_received_subvol(file, argp);
31db9f7c
AB		 4197 case BTRFS_IOC_SEND:
4198 return btrfs_ioctl_send(file, argp);
c11d2c23 4199 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 4200 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b 4201 case BTRFS_IOC_QUOTA_CTL:
905b0dda 4202 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 4203 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 4204 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 4205 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 4206 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 4207 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 4208 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 4209 case BTRFS_IOC_QUOTA_RESCAN:
4210 return btrfs_ioctl_quota_rescan(file, argp);
4211 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4212 return btrfs_ioctl_quota_rescan_status(file, argp);
3f6bcfbd
SB		 4213 case BTRFS_IOC_DEV_REPLACE:
4214 return btrfs_ioctl_dev_replace(root, argp);
867ab667 4215 case BTRFS_IOC_GET_FSLABEL:
4216 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 4217 case BTRFS_IOC_SET_FSLABEL:
4218 return btrfs_ioctl_set_fslabel(file, argp);
f46b5a66
CH		 4219 }
4220
4221 return -ENOTTY;
4222}
kernel source for telekom puls (alcatel/mediatek)