]> git.ipfire.org Git - people/ms/linux.git/blame - fs/btrfs/ioctl.c
projects / people / ms / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Btrfs: don't leak transaction in btrfs_sync_file()
[people/ms/linux.git] / fs / btrfs / ioctl.c
CommitLineData
f46b5a66
CH		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/kernel.h>
20#include <linux/bio.h>
21#include <linux/buffer_head.h>
22#include <linux/file.h>
23#include <linux/fs.h>
cb8e7090 24#include <linux/fsnotify.h>
f46b5a66
CH		 25#include <linux/pagemap.h>
26#include <linux/highmem.h>
27#include <linux/time.h>
28#include <linux/init.h>
29#include <linux/string.h>
f46b5a66 30#include <linux/backing-dev.h>
cb8e7090 31#include <linux/mount.h>
f46b5a66 32#include <linux/mpage.h>
cb8e7090 33#include <linux/namei.h>
f46b5a66
CH		 34#include <linux/swap.h>
35#include <linux/writeback.h>
36#include <linux/statfs.h>
37#include <linux/compat.h>
38#include <linux/bit_spinlock.h>
cb8e7090 39#include <linux/security.h>
f46b5a66 40#include <linux/xattr.h>
7ea394f1 41#include <linux/vmalloc.h>
5a0e3ad6 42#include <linux/slab.h>
f7039b1d 43#include <linux/blkdev.h>
8ea05e3a 44#include <linux/uuid.h>
55e301fd 45#include <linux/btrfs.h>
416161db 46#include <linux/uaccess.h>
4b4e25f2 47#include "compat.h"
f46b5a66
CH		 48#include "ctree.h"
49#include "disk-io.h"
50#include "transaction.h"
51#include "btrfs_inode.h"
f46b5a66
CH		 52#include "print-tree.h"
53#include "volumes.h"
925baedd 54#include "locking.h"
581bb050 55#include "inode-map.h"
d7728c96 56#include "backref.h"
606686ee 57#include "rcu-string.h"
31db9f7c 58#include "send.h"
3f6bcfbd 59#include "dev-replace.h"
f46b5a66 60
416161db
MF		 61static int btrfs_clone(struct inode *src, struct inode *inode,
62 u64 off, u64 olen, u64 olen_aligned, u64 destoff);
63
6cbff00f
CH		 64/* Mask out flags that are inappropriate for the given type of inode. */
65static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
66{
67 if (S_ISDIR(mode))
68 return flags;
69 else if (S_ISREG(mode))
70 return flags & ~FS_DIRSYNC_FL;
71 else
72 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
73}
74
75/*
76 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
77 */
78static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
79{
80 unsigned int iflags = 0;
81
82 if (flags & BTRFS_INODE_SYNC)
83 iflags |= FS_SYNC_FL;
84 if (flags & BTRFS_INODE_IMMUTABLE)
85 iflags |= FS_IMMUTABLE_FL;
86 if (flags & BTRFS_INODE_APPEND)
87 iflags |= FS_APPEND_FL;
88 if (flags & BTRFS_INODE_NODUMP)
89 iflags |= FS_NODUMP_FL;
90 if (flags & BTRFS_INODE_NOATIME)
91 iflags |= FS_NOATIME_FL;
92 if (flags & BTRFS_INODE_DIRSYNC)
93 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 94 if (flags & BTRFS_INODE_NODATACOW)
95 iflags |= FS_NOCOW_FL;
96
97 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
98 iflags |= FS_COMPR_FL;
99 else if (flags & BTRFS_INODE_NOCOMPRESS)
100 iflags |= FS_NOCOMP_FL;
6cbff00f
CH		 101
102 return iflags;
103}
104
105/*
106 * Update inode->i_flags based on the btrfs internal flags.
107 */
108void btrfs_update_iflags(struct inode *inode)
109{
110 struct btrfs_inode *ip = BTRFS_I(inode);
111
112 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
113
114 if (ip->flags & BTRFS_INODE_SYNC)
115 inode->i_flags |= S_SYNC;
116 if (ip->flags & BTRFS_INODE_IMMUTABLE)
117 inode->i_flags |= S_IMMUTABLE;
118 if (ip->flags & BTRFS_INODE_APPEND)
119 inode->i_flags |= S_APPEND;
120 if (ip->flags & BTRFS_INODE_NOATIME)
121 inode->i_flags |= S_NOATIME;
122 if (ip->flags & BTRFS_INODE_DIRSYNC)
123 inode->i_flags |= S_DIRSYNC;
124}
125
126/*
127 * Inherit flags from the parent inode.
128 *
e27425d6 129 * Currently only the compression flags and the cow flags are inherited.
6cbff00f
CH		 130 */
131void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
132{
0b4dcea5
CM		 133 unsigned int flags;
134
135 if (!dir)
136 return;
137
138 flags = BTRFS_I(dir)->flags;
6cbff00f 139
e27425d6
JB		 140 if (flags & BTRFS_INODE_NOCOMPRESS) {
141 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
142 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
143 } else if (flags & BTRFS_INODE_COMPRESS) {
144 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
145 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
146 }
147
213490b3 148 if (flags & BTRFS_INODE_NODATACOW) {
e27425d6 149 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
213490b3
LB		 150 if (S_ISREG(inode->i_mode))
151 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
152 }
6cbff00f 153
6cbff00f
CH		 154 btrfs_update_iflags(inode);
155}
156
157static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
158{
496ad9aa 159 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
6cbff00f
CH		 160 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
161
162 if (copy_to_user(arg, &flags, sizeof(flags)))
163 return -EFAULT;
164 return 0;
165}
166
75e7cb7f
LB		 167static int check_flags(unsigned int flags)
168{
169 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
170 FS_NOATIME_FL | FS_NODUMP_FL | \
171 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 172 FS_NOCOMP_FL | FS_COMPR_FL |
173 FS_NOCOW_FL))
75e7cb7f
LB		 174 return -EOPNOTSUPP;
175
176 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
177 return -EINVAL;
178
75e7cb7f
LB		 179 return 0;
180}
181
6cbff00f
CH		 182static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
183{
496ad9aa 184 struct inode *inode = file_inode(file);
6cbff00f
CH		 185 struct btrfs_inode *ip = BTRFS_I(inode);
186 struct btrfs_root *root = ip->root;
187 struct btrfs_trans_handle *trans;
188 unsigned int flags, oldflags;
189 int ret;
f062abf0
LZ		 190 u64 ip_oldflags;
191 unsigned int i_oldflags;
7e97b8da 192 umode_t mode;
6cbff00f 193
b83cc969
LZ		 194 if (btrfs_root_readonly(root))
195 return -EROFS;
196
6cbff00f
CH		 197 if (copy_from_user(&flags, arg, sizeof(flags)))
198 return -EFAULT;
199
75e7cb7f
LB		 200 ret = check_flags(flags);
201 if (ret)
202 return ret;
f46b5a66 203
2e149670 204 if (!inode_owner_or_capable(inode))
6cbff00f
CH		 205 return -EACCES;
206
e7848683
JK		 207 ret = mnt_want_write_file(file);
208 if (ret)
209 return ret;
210
6cbff00f
CH		 211 mutex_lock(&inode->i_mutex);
212
f062abf0
LZ		 213 ip_oldflags = ip->flags;
214 i_oldflags = inode->i_flags;
7e97b8da 215 mode = inode->i_mode;
f062abf0 216
6cbff00f
CH		 217 flags = btrfs_mask_flags(inode->i_mode, flags);
218 oldflags = btrfs_flags_to_ioctl(ip->flags);
219 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
220 if (!capable(CAP_LINUX_IMMUTABLE)) {
221 ret = -EPERM;
222 goto out_unlock;
223 }
224 }
225
6cbff00f
CH		 226 if (flags & FS_SYNC_FL)
227 ip->flags |= BTRFS_INODE_SYNC;
228 else
229 ip->flags &= ~BTRFS_INODE_SYNC;
230 if (flags & FS_IMMUTABLE_FL)
231 ip->flags |= BTRFS_INODE_IMMUTABLE;
232 else
233 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
234 if (flags & FS_APPEND_FL)
235 ip->flags |= BTRFS_INODE_APPEND;
236 else
237 ip->flags &= ~BTRFS_INODE_APPEND;
238 if (flags & FS_NODUMP_FL)
239 ip->flags |= BTRFS_INODE_NODUMP;
240 else
241 ip->flags &= ~BTRFS_INODE_NODUMP;
242 if (flags & FS_NOATIME_FL)
243 ip->flags |= BTRFS_INODE_NOATIME;
244 else
245 ip->flags &= ~BTRFS_INODE_NOATIME;
246 if (flags & FS_DIRSYNC_FL)
247 ip->flags |= BTRFS_INODE_DIRSYNC;
248 else
249 ip->flags &= ~BTRFS_INODE_DIRSYNC;
7e97b8da
DS		 250 if (flags & FS_NOCOW_FL) {
251 if (S_ISREG(mode)) {
252 /*
253 * It's safe to turn csums off here, no extents exist.
254 * Otherwise we want the flag to reflect the real COW
255 * status of the file and will not set it.
256 */
257 if (inode->i_size == 0)
258 ip->flags |= BTRFS_INODE_NODATACOW
259 | BTRFS_INODE_NODATASUM;
260 } else {
261 ip->flags |= BTRFS_INODE_NODATACOW;
262 }
263 } else {
264 /*
265 * Revert back under same assuptions as above
266 */
267 if (S_ISREG(mode)) {
268 if (inode->i_size == 0)
269 ip->flags &= ~(BTRFS_INODE_NODATACOW
270 | BTRFS_INODE_NODATASUM);
271 } else {
272 ip->flags &= ~BTRFS_INODE_NODATACOW;
273 }
274 }
6cbff00f 275
75e7cb7f
LB		 276 /*
277 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
278 * flag may be changed automatically if compression code won't make
279 * things smaller.
280 */
281 if (flags & FS_NOCOMP_FL) {
282 ip->flags &= ~BTRFS_INODE_COMPRESS;
283 ip->flags |= BTRFS_INODE_NOCOMPRESS;
284 } else if (flags & FS_COMPR_FL) {
285 ip->flags |= BTRFS_INODE_COMPRESS;
286 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
ebcb904d
LZ		 287 } else {
288 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 289 }
6cbff00f 290
4da6f1a3 291 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 292 if (IS_ERR(trans)) {
293 ret = PTR_ERR(trans);
294 goto out_drop;
295 }
6cbff00f 296
306424cc 297 btrfs_update_iflags(inode);
0c4d2d95 298 inode_inc_iversion(inode);
306424cc 299 inode->i_ctime = CURRENT_TIME;
6cbff00f 300 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 301
6cbff00f 302 btrfs_end_transaction(trans, root);
f062abf0
LZ		 303 out_drop:
304 if (ret) {
305 ip->flags = ip_oldflags;
306 inode->i_flags = i_oldflags;
307 }
6cbff00f 308
6cbff00f
CH		 309 out_unlock:
310 mutex_unlock(&inode->i_mutex);
e7848683 311 mnt_drop_write_file(file);
2d4e6f6a 312 return ret;
6cbff00f
CH		 313}
314
315static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
316{
496ad9aa 317 struct inode *inode = file_inode(file);
6cbff00f
CH		 318
319 return put_user(inode->i_generation, arg);
320}
f46b5a66 321
f7039b1d
LD		 322static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
323{
815745cf 324 struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
f7039b1d
LD		 325 struct btrfs_device *device;
326 struct request_queue *q;
327 struct fstrim_range range;
328 u64 minlen = ULLONG_MAX;
329 u64 num_devices = 0;
815745cf 330 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
f7039b1d
LD		 331 int ret;
332
333 if (!capable(CAP_SYS_ADMIN))
334 return -EPERM;
335
1f78160c
XG		 336 rcu_read_lock();
337 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
338 dev_list) {
f7039b1d
LD		 339 if (!device->bdev)
340 continue;
341 q = bdev_get_queue(device->bdev);
342 if (blk_queue_discard(q)) {
343 num_devices++;
344 minlen = min((u64)q->limits.discard_granularity,
345 minlen);
346 }
347 }
1f78160c 348 rcu_read_unlock();
f4c697e6 349
f7039b1d
LD		 350 if (!num_devices)
351 return -EOPNOTSUPP;
f7039b1d
LD		 352 if (copy_from_user(&range, arg, sizeof(range)))
353 return -EFAULT;
e515c18b
LC		 354 if (range.start > total_bytes ||
355 range.len < fs_info->sb->s_blocksize)
f4c697e6 356 return -EINVAL;
f7039b1d 357
f4c697e6 358 range.len = min(range.len, total_bytes - range.start);
f7039b1d 359 range.minlen = max(range.minlen, minlen);
815745cf 360 ret = btrfs_trim_fs(fs_info->tree_root, &range);
f7039b1d
LD		 361 if (ret < 0)
362 return ret;
363
364 if (copy_to_user(arg, &range, sizeof(range)))
365 return -EFAULT;
366
367 return 0;
368}
369
dd5f9615
SB		 370int btrfs_is_empty_uuid(u8 *uuid)
371{
372 static char empty_uuid[BTRFS_UUID_SIZE] = {0};
373
374 return !memcmp(uuid, empty_uuid, BTRFS_UUID_SIZE);
375}
376
d5c12070 377static noinline int create_subvol(struct inode *dir,
cb8e7090 378 struct dentry *dentry,
72fd032e 379 char *name, int namelen,
6f72c7e2 380 u64 *async_transid,
8696c533 381 struct btrfs_qgroup_inherit *inherit)
f46b5a66
CH		 382{
383 struct btrfs_trans_handle *trans;
384 struct btrfs_key key;
385 struct btrfs_root_item root_item;
386 struct btrfs_inode_item *inode_item;
387 struct extent_buffer *leaf;
d5c12070 388 struct btrfs_root *root = BTRFS_I(dir)->root;
76dda93c 389 struct btrfs_root *new_root;
d5c12070 390 struct btrfs_block_rsv block_rsv;
8ea05e3a 391 struct timespec cur_time = CURRENT_TIME;
f46b5a66
CH		 392 int ret;
393 int err;
394 u64 objectid;
395 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 396 u64 index = 0;
d5c12070 397 u64 qgroup_reserved;
8ea05e3a 398 uuid_le new_uuid;
f46b5a66 399
581bb050 400 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
2fbe8c8a 401 if (ret)
a22285a6 402 return ret;
6a912213 403
d5c12070 404 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
9ed74f2d 405 /*
d5c12070
MX		 406 * The same as the snapshot creation, please see the comment
407 * of create_snapshot().
9ed74f2d 408 */
d5c12070 409 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
dd5f9615 410 8, &qgroup_reserved, false);
d5c12070
MX		 411 if (ret)
412 return ret;
413
414 trans = btrfs_start_transaction(root, 0);
415 if (IS_ERR(trans)) {
416 ret = PTR_ERR(trans);
417 goto out;
418 }
419 trans->block_rsv = &block_rsv;
420 trans->bytes_reserved = block_rsv.size;
f46b5a66 421
8696c533 422 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
6f72c7e2
AJ		 423 if (ret)
424 goto fail;
425
5d4f98a2 426 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
5581a51a 427 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 428 if (IS_ERR(leaf)) {
429 ret = PTR_ERR(leaf);
430 goto fail;
431 }
f46b5a66 432
5d4f98a2 433 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
f46b5a66
CH		 434 btrfs_set_header_bytenr(leaf, leaf->start);
435 btrfs_set_header_generation(leaf, trans->transid);
5d4f98a2 436 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
f46b5a66
CH		 437 btrfs_set_header_owner(leaf, objectid);
438
fba6aa75 439 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(leaf),
f46b5a66 440 BTRFS_FSID_SIZE);
5d4f98a2 441 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
b308bc2f 442 btrfs_header_chunk_tree_uuid(leaf),
5d4f98a2 443 BTRFS_UUID_SIZE);
f46b5a66
CH		 444 btrfs_mark_buffer_dirty(leaf);
445
8ea05e3a
AB		 446 memset(&root_item, 0, sizeof(root_item));
447
f46b5a66 448 inode_item = &root_item.inode;
3cae210f
QW		 449 btrfs_set_stack_inode_generation(inode_item, 1);
450 btrfs_set_stack_inode_size(inode_item, 3);
451 btrfs_set_stack_inode_nlink(inode_item, 1);
452 btrfs_set_stack_inode_nbytes(inode_item, root->leafsize);
453 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
f46b5a66 454
3cae210f
QW		 455 btrfs_set_root_flags(&root_item, 0);
456 btrfs_set_root_limit(&root_item, 0);
457 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
08fe4db1 458
f46b5a66 459 btrfs_set_root_bytenr(&root_item, leaf->start);
84234f3a 460 btrfs_set_root_generation(&root_item, trans->transid);
f46b5a66
CH		 461 btrfs_set_root_level(&root_item, 0);
462 btrfs_set_root_refs(&root_item, 1);
86b9f2ec 463 btrfs_set_root_used(&root_item, leaf->len);
80ff3856 464 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66 465
8ea05e3a
AB		 466 btrfs_set_root_generation_v2(&root_item,
467 btrfs_root_generation(&root_item));
468 uuid_le_gen(&new_uuid);
469 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
3cae210f
QW		 470 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
471 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
8ea05e3a
AB		 472 root_item.ctime = root_item.otime;
473 btrfs_set_root_ctransid(&root_item, trans->transid);
474 btrfs_set_root_otransid(&root_item, trans->transid);
f46b5a66 475
925baedd 476 btrfs_tree_unlock(leaf);
f46b5a66
CH		 477 free_extent_buffer(leaf);
478 leaf = NULL;
479
480 btrfs_set_root_dirid(&root_item, new_dirid);
481
482 key.objectid = objectid;
5d4f98a2 483 key.offset = 0;
f46b5a66
CH		 484 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
485 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
486 &root_item);
487 if (ret)
488 goto fail;
489
76dda93c
YZ		 490 key.offset = (u64)-1;
491 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
79787eaa
JM		 492 if (IS_ERR(new_root)) {
493 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
494 ret = PTR_ERR(new_root);
495 goto fail;
496 }
76dda93c
YZ		 497
498 btrfs_record_root_in_trans(trans, new_root);
499
d82a6f1d 500 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
ce598979
MF		 501 if (ret) {
502 /* We potentially lose an unused inode item here */
79787eaa 503 btrfs_abort_transaction(trans, root, ret);
ce598979
MF		 504 goto fail;
505 }
506
f46b5a66
CH		 507 /*
508 * insert the directory item
509 */
3de4586c 510 ret = btrfs_set_inode_index(dir, &index);
79787eaa
JM		 511 if (ret) {
512 btrfs_abort_transaction(trans, root, ret);
513 goto fail;
514 }
3de4586c
CM		 515
516 ret = btrfs_insert_dir_item(trans, root,
16cdcec7 517 name, namelen, dir, &key,
3de4586c 518 BTRFS_FT_DIR, index);
79787eaa
JM		 519 if (ret) {
520 btrfs_abort_transaction(trans, root, ret);
f46b5a66 521 goto fail;
79787eaa 522 }
0660b5af 523
52c26179
YZ		 524 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
525 ret = btrfs_update_inode(trans, root, dir);
526 BUG_ON(ret);
527
0660b5af 528 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4df27c4d 529 objectid, root->root_key.objectid,
33345d01 530 btrfs_ino(dir), index, name, namelen);
76dda93c 531 BUG_ON(ret);
f46b5a66 532
dd5f9615
SB		 533 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
534 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
535 objectid);
536 if (ret)
537 btrfs_abort_transaction(trans, root, ret);
538
f46b5a66 539fail:
d5c12070
MX		 540 trans->block_rsv = NULL;
541 trans->bytes_reserved = 0;
72fd032e
SW		 542 if (async_transid) {
543 *async_transid = trans->transid;
544 err = btrfs_commit_transaction_async(trans, root, 1);
00d71c9c
MX		 545 if (err)
546 err = btrfs_commit_transaction(trans, root);
72fd032e
SW		 547 } else {
548 err = btrfs_commit_transaction(trans, root);
549 }
f46b5a66
CH		 550 if (err && !ret)
551 ret = err;
1a65e24b
CM		 552
553 if (!ret)
554 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
d5c12070
MX		 555out:
556 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
f46b5a66
CH		 557 return ret;
558}
559
e9662f70
MX		 560static int create_snapshot(struct btrfs_root *root, struct inode *dir,
561 struct dentry *dentry, char *name, int namelen,
562 u64 *async_transid, bool readonly,
563 struct btrfs_qgroup_inherit *inherit)
f46b5a66 564{
2e4bfab9 565 struct inode *inode;
f46b5a66
CH		 566 struct btrfs_pending_snapshot *pending_snapshot;
567 struct btrfs_trans_handle *trans;
2e4bfab9 568 int ret;
f46b5a66
CH		 569
570 if (!root->ref_cows)
571 return -EINVAL;
572
6a03843d
MX		 573 ret = btrfs_start_delalloc_inodes(root, 0);
574 if (ret)
575 return ret;
576
f0de181c 577 btrfs_wait_ordered_extents(root);
6a03843d 578
3de4586c 579 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
a22285a6
YZ		 580 if (!pending_snapshot)
581 return -ENOMEM;
582
66d8f3dd
MX		 583 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
584 BTRFS_BLOCK_RSV_TEMP);
d5c12070
MX		 585 /*
586 * 1 - parent dir inode
587 * 2 - dir entries
588 * 1 - root item
589 * 2 - root ref/backref
590 * 1 - root of snapshot
dd5f9615 591 * 1 - UUID item
d5c12070
MX		 592 */
593 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
dd5f9615 594 &pending_snapshot->block_rsv, 8,
ee3441b4
JM		 595 &pending_snapshot->qgroup_reserved,
596 false);
d5c12070
MX		 597 if (ret)
598 goto out;
599
3de4586c 600 pending_snapshot->dentry = dentry;
f46b5a66 601 pending_snapshot->root = root;
b83cc969 602 pending_snapshot->readonly = readonly;
e9662f70 603 pending_snapshot->dir = dir;
8696c533 604 pending_snapshot->inherit = inherit;
a22285a6 605
d5c12070 606 trans = btrfs_start_transaction(root, 0);
a22285a6
YZ		 607 if (IS_ERR(trans)) {
608 ret = PTR_ERR(trans);
609 goto fail;
610 }
611
8351583e 612 spin_lock(&root->fs_info->trans_lock);
f46b5a66
CH		 613 list_add(&pending_snapshot->list,
614 &trans->transaction->pending_snapshots);
8351583e 615 spin_unlock(&root->fs_info->trans_lock);
72fd032e
SW		 616 if (async_transid) {
617 *async_transid = trans->transid;
618 ret = btrfs_commit_transaction_async(trans,
619 root->fs_info->extent_root, 1);
00d71c9c
MX		 620 if (ret)
621 ret = btrfs_commit_transaction(trans, root);
72fd032e
SW		 622 } else {
623 ret = btrfs_commit_transaction(trans,
624 root->fs_info->extent_root);
625 }
aec8030a 626 if (ret)
c37b2b62 627 goto fail;
a22285a6
YZ		 628
629 ret = pending_snapshot->error;
630 if (ret)
631 goto fail;
632
66b4ffd1
JB		 633 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
634 if (ret)
635 goto fail;
f46b5a66 636
2fbe8c8a 637 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 638 if (IS_ERR(inode)) {
639 ret = PTR_ERR(inode);
640 goto fail;
641 }
642 BUG_ON(!inode);
643 d_instantiate(dentry, inode);
644 ret = 0;
645fail:
d5c12070
MX		 646 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
647 &pending_snapshot->block_rsv,
648 pending_snapshot->qgroup_reserved);
649out:
a22285a6 650 kfree(pending_snapshot);
f46b5a66
CH		 651 return ret;
652}
653
4260f7c7
SW		 654/* copy of check_sticky in fs/namei.c()
655* It's inline, so penalty for filesystems that don't use sticky bit is
656* minimal.
657*/
658static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
659{
2f2f43d3 660 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 661
662 if (!(dir->i_mode & S_ISVTX))
663 return 0;
2f2f43d3 664 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 665 return 0;
2f2f43d3 666 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 667 return 0;
668 return !capable(CAP_FOWNER);
669}
670
671/* copy of may_delete in fs/namei.c()
672 * Check whether we can remove a link victim from directory dir, check
673 * whether the type of victim is right.
674 * 1. We can't do it if dir is read-only (done in permission())
675 * 2. We should have write and exec permissions on dir
676 * 3. We can't remove anything from append-only dir
677 * 4. We can't do anything with immutable dir (done in permission())
678 * 5. If the sticky bit on dir is set we should either
679 * a. be owner of dir, or
680 * b. be owner of victim, or
681 * c. have CAP_FOWNER capability
682 * 6. If the victim is append-only or immutable we can't do antyhing with
683 * links pointing to it.
684 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
685 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
686 * 9. We can't remove a root or mountpoint.
687 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
688 * nfs_async_unlink().
689 */
690
691static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
692{
693 int error;
694
695 if (!victim->d_inode)
696 return -ENOENT;
697
698 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 699 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 700
701 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
702 if (error)
703 return error;
704 if (IS_APPEND(dir))
705 return -EPERM;
706 if (btrfs_check_sticky(dir, victim->d_inode)||
707 IS_APPEND(victim->d_inode)||
708 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
709 return -EPERM;
710 if (isdir) {
711 if (!S_ISDIR(victim->d_inode->i_mode))
712 return -ENOTDIR;
713 if (IS_ROOT(victim))
714 return -EBUSY;
715 } else if (S_ISDIR(victim->d_inode->i_mode))
716 return -EISDIR;
717 if (IS_DEADDIR(dir))
718 return -ENOENT;
719 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
720 return -EBUSY;
721 return 0;
722}
723
cb8e7090
CH		 724/* copy of may_create in fs/namei.c() */
725static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
726{
727 if (child->d_inode)
728 return -EEXIST;
729 if (IS_DEADDIR(dir))
730 return -ENOENT;
731 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
732}
733
734/*
735 * Create a new subvolume below @parent. This is largely modeled after
736 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
737 * inside this filesystem so it's quite a bit simpler.
738 */
76dda93c
YZ		 739static noinline int btrfs_mksubvol(struct path *parent,
740 char *name, int namelen,
72fd032e 741 struct btrfs_root *snap_src,
6f72c7e2 742 u64 *async_transid, bool readonly,
8696c533 743 struct btrfs_qgroup_inherit *inherit)
cb8e7090 744{
76dda93c 745 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 746 struct dentry *dentry;
747 int error;
748
5c50c9b8
DS		 749 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
750 if (error == -EINTR)
751 return error;
cb8e7090
CH		 752
753 dentry = lookup_one_len(name, parent->dentry, namelen);
754 error = PTR_ERR(dentry);
755 if (IS_ERR(dentry))
756 goto out_unlock;
757
758 error = -EEXIST;
759 if (dentry->d_inode)
760 goto out_dput;
761
76dda93c 762 error = btrfs_may_create(dir, dentry);
cb8e7090 763 if (error)
a874a63e 764 goto out_dput;
cb8e7090 765
9c52057c
CM		 766 /*
767 * even if this name doesn't exist, we may get hash collisions.
768 * check for them now when we can safely fail
769 */
770 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
771 dir->i_ino, name,
772 namelen);
773 if (error)
774 goto out_dput;
775
76dda93c
YZ		 776 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
777
778 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
779 goto out_up_read;
780
3de4586c 781 if (snap_src) {
e9662f70 782 error = create_snapshot(snap_src, dir, dentry, name, namelen,
6f72c7e2 783 async_transid, readonly, inherit);
3de4586c 784 } else {
d5c12070
MX		 785 error = create_subvol(dir, dentry, name, namelen,
786 async_transid, inherit);
3de4586c 787 }
76dda93c
YZ		 788 if (!error)
789 fsnotify_mkdir(dir, dentry);
790out_up_read:
791 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 792out_dput:
793 dput(dentry);
794out_unlock:
76dda93c 795 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 796 return error;
797}
798
4cb5300b
CM		 799/*
800 * When we're defragging a range, we don't want to kick it off again
801 * if it is really just waiting for delalloc to send it down.
802 * If we find a nice big extent or delalloc range for the bytes in the
803 * file you want to defrag, we return 0 to let you know to skip this
804 * part of the file
805 */
806static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
807{
808 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
809 struct extent_map *em = NULL;
810 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
811 u64 end;
812
813 read_lock(&em_tree->lock);
814 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
815 read_unlock(&em_tree->lock);
816
817 if (em) {
818 end = extent_map_end(em);
819 free_extent_map(em);
820 if (end - offset > thresh)
821 return 0;
822 }
823 /* if we already have a nice delalloc here, just stop */
824 thresh /= 2;
825 end = count_range_bits(io_tree, &offset, offset + thresh,
826 thresh, EXTENT_DELALLOC, 1);
827 if (end >= thresh)
828 return 0;
829 return 1;
830}
831
832/*
833 * helper function to walk through a file and find extents
834 * newer than a specific transid, and smaller than thresh.
835 *
836 * This is used by the defragging code to find new and small
837 * extents
838 */
839static int find_new_extents(struct btrfs_root *root,
840 struct inode *inode, u64 newer_than,
841 u64 *off, int thresh)
842{
843 struct btrfs_path *path;
844 struct btrfs_key min_key;
845 struct btrfs_key max_key;
846 struct extent_buffer *leaf;
847 struct btrfs_file_extent_item *extent;
848 int type;
849 int ret;
a4689d2b 850 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 851
852 path = btrfs_alloc_path();
853 if (!path)
854 return -ENOMEM;
855
a4689d2b 856 min_key.objectid = ino;
4cb5300b
CM		 857 min_key.type = BTRFS_EXTENT_DATA_KEY;
858 min_key.offset = *off;
859
a4689d2b 860 max_key.objectid = ino;
4cb5300b
CM		 861 max_key.type = (u8)-1;
862 max_key.offset = (u64)-1;
863
864 path->keep_locks = 1;
865
866 while(1) {
867 ret = btrfs_search_forward(root, &min_key, &max_key,
de78b51a 868 path, newer_than);
4cb5300b
CM		 869 if (ret != 0)
870 goto none;
a4689d2b 871 if (min_key.objectid != ino)
4cb5300b
CM		 872 goto none;
873 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
874 goto none;
875
876 leaf = path->nodes[0];
877 extent = btrfs_item_ptr(leaf, path->slots[0],
878 struct btrfs_file_extent_item);
879
880 type = btrfs_file_extent_type(leaf, extent);
881 if (type == BTRFS_FILE_EXTENT_REG &&
882 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
883 check_defrag_in_cache(inode, min_key.offset, thresh)) {
884 *off = min_key.offset;
885 btrfs_free_path(path);
886 return 0;
887 }
888
889 if (min_key.offset == (u64)-1)
890 goto none;
891
892 min_key.offset++;
893 btrfs_release_path(path);
894 }
895none:
896 btrfs_free_path(path);
897 return -ENOENT;
898}
899
6c282eb4 900static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 901{
902 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 903 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
904 struct extent_map *em;
905 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 906
6c282eb4
LZ		 907 /*
908 * hopefully we have this extent in the tree already, try without
909 * the full extent lock
910 */
17ce6ef8 911 read_lock(&em_tree->lock);
6c282eb4 912 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 913 read_unlock(&em_tree->lock);
914
6c282eb4
LZ		 915 if (!em) {
916 /* get the big lock and read metadata off disk */
917 lock_extent(io_tree, start, start + len - 1);
918 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
919 unlock_extent(io_tree, start, start + len - 1);
920
921 if (IS_ERR(em))
922 return NULL;
923 }
924
925 return em;
926}
17ce6ef8 927
6c282eb4
LZ		 928static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
929{
930 struct extent_map *next;
931 bool ret = true;
932
933 /* this is the last extent */
934 if (em->start + em->len >= i_size_read(inode))
935 return false;
936
937 next = defrag_lookup_extent(inode, em->start + em->len);
938 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
939 ret = false;
940
941 free_extent_map(next);
17ce6ef8
LB		 942 return ret;
943}
944
6c282eb4 945static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 946 u64 *last_len, u64 *skip, u64 *defrag_end,
947 int compress)
940100a4 948{
6c282eb4 949 struct extent_map *em;
940100a4 950 int ret = 1;
6c282eb4 951 bool next_mergeable = true;
940100a4
CM		 952
953 /*
008873ea 954 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 955 * defragging it
956 */
957 if (start < *defrag_end)
958 return 1;
959
960 *skip = 0;
961
6c282eb4
LZ		 962 em = defrag_lookup_extent(inode, start);
963 if (!em)
964 return 0;
940100a4
CM		 965
966 /* this will cover holes, and inline extents */
17ce6ef8 967 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 968 ret = 0;
17ce6ef8
LB		 969 goto out;
970 }
971
6c282eb4 972 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 973
974 /*
6c282eb4
LZ		 975 * we hit a real extent, if it is big or the next extent is not a
976 * real extent, don't bother defragging it
940100a4 977 */
a43a2111 978 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 979 (em->len >= thresh || !next_mergeable))
940100a4 980 ret = 0;
17ce6ef8 981out:
940100a4
CM		 982 /*
983 * last_len ends up being a counter of how many bytes we've defragged.
984 * every time we choose not to defrag an extent, we reset *last_len
985 * so that the next tiny extent will force a defrag.
986 *
987 * The end result of this is that tiny extents before a single big
988 * extent will force at least part of that big extent to be defragged.
989 */
990 if (ret) {
940100a4
CM		 991 *defrag_end = extent_map_end(em);
992 } else {
993 *last_len = 0;
994 *skip = extent_map_end(em);
995 *defrag_end = 0;
996 }
997
998 free_extent_map(em);
999 return ret;
1000}
1001
4cb5300b
CM		 1002/*
1003 * it doesn't do much good to defrag one or two pages
1004 * at a time. This pulls in a nice chunk of pages
1005 * to COW and defrag.
1006 *
1007 * It also makes sure the delalloc code has enough
1008 * dirty data to avoid making new small extents as part
1009 * of the defrag
1010 *
1011 * It's a good idea to start RA on this range
1012 * before calling this.
1013 */
1014static int cluster_pages_for_defrag(struct inode *inode,
1015 struct page **pages,
1016 unsigned long start_index,
1017 int num_pages)
f46b5a66 1018{
4cb5300b
CM		 1019 unsigned long file_end;
1020 u64 isize = i_size_read(inode);
1021 u64 page_start;
1022 u64 page_end;
1f12bd06 1023 u64 page_cnt;
4cb5300b
CM		 1024 int ret;
1025 int i;
1026 int i_done;
3eaa2885 1027 struct btrfs_ordered_extent *ordered;
4cb5300b 1028 struct extent_state *cached_state = NULL;
600a45e1 1029 struct extent_io_tree *tree;
3b16a4e3 1030 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 1031
4cb5300b 1032 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 1033 if (!isize || start_index > file_end)
1034 return 0;
1035
1036 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 1037
1038 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 1039 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1040 if (ret)
1041 return ret;
4cb5300b 1042 i_done = 0;
600a45e1 1043 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 1044
1045 /* step one, lock all the pages */
1f12bd06 1046 for (i = 0; i < page_cnt; i++) {
4cb5300b 1047 struct page *page;
600a45e1 1048again:
a94733d0 1049 page = find_or_create_page(inode->i_mapping,
600a45e1 1050 start_index + i, mask);
4cb5300b
CM		 1051 if (!page)
1052 break;
1053
600a45e1
MX		 1054 page_start = page_offset(page);
1055 page_end = page_start + PAGE_CACHE_SIZE - 1;
1056 while (1) {
d0082371 1057 lock_extent(tree, page_start, page_end);
600a45e1
MX		 1058 ordered = btrfs_lookup_ordered_extent(inode,
1059 page_start);
d0082371 1060 unlock_extent(tree, page_start, page_end);
600a45e1
MX		 1061 if (!ordered)
1062 break;
1063
1064 unlock_page(page);
1065 btrfs_start_ordered_extent(inode, ordered, 1);
1066 btrfs_put_ordered_extent(ordered);
1067 lock_page(page);
1f12bd06
LB		 1068 /*
1069 * we unlocked the page above, so we need check if
1070 * it was released or not.
1071 */
1072 if (page->mapping != inode->i_mapping) {
1073 unlock_page(page);
1074 page_cache_release(page);
1075 goto again;
1076 }
600a45e1
MX		 1077 }
1078
4cb5300b
CM		 1079 if (!PageUptodate(page)) {
1080 btrfs_readpage(NULL, page);
1081 lock_page(page);
1082 if (!PageUptodate(page)) {
1083 unlock_page(page);
1084 page_cache_release(page);
1085 ret = -EIO;
1086 break;
1087 }
1088 }
600a45e1 1089
600a45e1
MX		 1090 if (page->mapping != inode->i_mapping) {
1091 unlock_page(page);
1092 page_cache_release(page);
1093 goto again;
1094 }
1095
4cb5300b
CM		 1096 pages[i] = page;
1097 i_done++;
1098 }
1099 if (!i_done || ret)
1100 goto out;
1101
1102 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1103 goto out;
1104
1105 /*
1106 * so now we have a nice long stream of locked
1107 * and up to date pages, lets wait on them
1108 */
1109 for (i = 0; i < i_done; i++)
1110 wait_on_page_writeback(pages[i]);
1111
1112 page_start = page_offset(pages[0]);
1113 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1114
1115 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1116 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1117 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1118 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1119 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1120 &cached_state, GFP_NOFS);
4cb5300b 1121
1f12bd06 1122 if (i_done != page_cnt) {
9e0baf60
JB		 1123 spin_lock(&BTRFS_I(inode)->lock);
1124 BTRFS_I(inode)->outstanding_extents++;
1125 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1126 btrfs_delalloc_release_space(inode,
1f12bd06 1127 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1128 }
1129
1130
9e8a4a8b
LB		 1131 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1132 &cached_state, GFP_NOFS);
4cb5300b
CM		 1133
1134 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1135 page_start, page_end - 1, &cached_state,
1136 GFP_NOFS);
1137
1138 for (i = 0; i < i_done; i++) {
1139 clear_page_dirty_for_io(pages[i]);
1140 ClearPageChecked(pages[i]);
1141 set_page_extent_mapped(pages[i]);
1142 set_page_dirty(pages[i]);
1143 unlock_page(pages[i]);
1144 page_cache_release(pages[i]);
1145 }
1146 return i_done;
1147out:
1148 for (i = 0; i < i_done; i++) {
1149 unlock_page(pages[i]);
1150 page_cache_release(pages[i]);
1151 }
1f12bd06 1152 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1153 return ret;
1154
1155}
1156
1157int btrfs_defrag_file(struct inode *inode, struct file *file,
1158 struct btrfs_ioctl_defrag_range_args *range,
1159 u64 newer_than, unsigned long max_to_defrag)
1160{
1161 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1162 struct file_ra_state *ra = NULL;
f46b5a66 1163 unsigned long last_index;
151a31b2 1164 u64 isize = i_size_read(inode);
940100a4
CM		 1165 u64 last_len = 0;
1166 u64 skip = 0;
1167 u64 defrag_end = 0;
4cb5300b 1168 u64 newer_off = range->start;
f46b5a66 1169 unsigned long i;
008873ea 1170 unsigned long ra_index = 0;
f46b5a66 1171 int ret;
4cb5300b 1172 int defrag_count = 0;
1a419d85 1173 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1174 int extent_thresh = range->extent_thresh;
008873ea
LZ		 1175 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1176 int cluster = max_cluster;
4cb5300b
CM		 1177 u64 new_align = ~((u64)128 * 1024 - 1);
1178 struct page **pages = NULL;
1179
0abd5b17
LB		 1180 if (isize == 0)
1181 return 0;
1182
1183 if (range->start >= isize)
1184 return -EINVAL;
1a419d85
LZ		 1185
1186 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1187 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1188 return -EINVAL;
1189 if (range->compress_type)
1190 compress_type = range->compress_type;
1191 }
f46b5a66 1192
0abd5b17
LB		 1193 if (extent_thresh == 0)
1194 extent_thresh = 256 * 1024;
940100a4 1195
4cb5300b
CM		 1196 /*
1197 * if we were not given a file, allocate a readahead
1198 * context
1199 */
1200 if (!file) {
1201 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1202 if (!ra)
1203 return -ENOMEM;
1204 file_ra_state_init(ra, inode->i_mapping);
1205 } else {
1206 ra = &file->f_ra;
1207 }
1208
008873ea 1209 pages = kmalloc(sizeof(struct page *) * max_cluster,
4cb5300b
CM		 1210 GFP_NOFS);
1211 if (!pages) {
1212 ret = -ENOMEM;
1213 goto out_ra;
1214 }
1215
1216 /* find the last page to defrag */
1e701a32 1217 if (range->start + range->len > range->start) {
151a31b2 1218 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1219 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1220 } else {
151a31b2 1221 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1222 }
1223
4cb5300b
CM		 1224 if (newer_than) {
1225 ret = find_new_extents(root, inode, newer_than,
1226 &newer_off, 64 * 1024);
1227 if (!ret) {
1228 range->start = newer_off;
1229 /*
1230 * we always align our defrag to help keep
1231 * the extents in the file evenly spaced
1232 */
1233 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1234 } else
1235 goto out_ra;
1236 } else {
1237 i = range->start >> PAGE_CACHE_SHIFT;
1238 }
1239 if (!max_to_defrag)
7ec31b54 1240 max_to_defrag = last_index + 1;
4cb5300b 1241
2a0f7f57
LZ		 1242 /*
1243 * make writeback starts from i, so the defrag range can be
1244 * written sequentially.
1245 */
1246 if (i < inode->i_mapping->writeback_index)
1247 inode->i_mapping->writeback_index = i;
1248
f7f43cc8
CM		 1249 while (i <= last_index && defrag_count < max_to_defrag &&
1250 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1251 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1252 /*
1253 * make sure we stop running if someone unmounts
1254 * the FS
1255 */
1256 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1257 break;
1258
210549eb
DS		 1259 if (btrfs_defrag_cancelled(root->fs_info)) {
1260 printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
1261 ret = -EAGAIN;
1262 break;
1263 }
1264
66c26892 1265 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1266 extent_thresh, &last_len, &skip,
a43a2111
AM		 1267 &defrag_end, range->flags &
1268 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1269 unsigned long next;
1270 /*
1271 * the should_defrag function tells us how much to skip
1272 * bump our counter by the suggested amount
1273 */
1274 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1275 i = max(i + 1, next);
1276 continue;
1277 }
008873ea
LZ		 1278
1279 if (!newer_than) {
1280 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1281 PAGE_CACHE_SHIFT) - i;
1282 cluster = min(cluster, max_cluster);
1283 } else {
1284 cluster = max_cluster;
1285 }
1286
008873ea
LZ		 1287 if (i + cluster > ra_index) {
1288 ra_index = max(i, ra_index);
1289 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1290 cluster);
1291 ra_index += max_cluster;
1292 }
940100a4 1293
ecb8bea8 1294 mutex_lock(&inode->i_mutex);
633085c7
FDBM		 1295 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1296 BTRFS_I(inode)->force_compress = compress_type;
008873ea 1297 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1298 if (ret < 0) {
1299 mutex_unlock(&inode->i_mutex);
4cb5300b 1300 goto out_ra;
ecb8bea8 1301 }
4cb5300b
CM		 1302
1303 defrag_count += ret;
d0e1d66b 1304 balance_dirty_pages_ratelimited(inode->i_mapping);
ecb8bea8 1305 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1306
1307 if (newer_than) {
1308 if (newer_off == (u64)-1)
1309 break;
1310
e1f041e1
LB		 1311 if (ret > 0)
1312 i += ret;
1313
4cb5300b
CM		 1314 newer_off = max(newer_off + 1,
1315 (u64)i << PAGE_CACHE_SHIFT);
1316
1317 ret = find_new_extents(root, inode,
1318 newer_than, &newer_off,
1319 64 * 1024);
1320 if (!ret) {
1321 range->start = newer_off;
1322 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1323 } else {
1324 break;
f46b5a66 1325 }
4cb5300b 1326 } else {
008873ea 1327 if (ret > 0) {
cbcc8326 1328 i += ret;
008873ea
LZ		 1329 last_len += ret << PAGE_CACHE_SHIFT;
1330 } else {
cbcc8326 1331 i++;
008873ea
LZ		 1332 last_len = 0;
1333 }
f46b5a66 1334 }
f46b5a66
CH		 1335 }
1336
1e701a32
CM		 1337 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1338 filemap_flush(inode->i_mapping);
1339
1340 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1341 /* the filemap_flush will queue IO into the worker threads, but
1342 * we have to make sure the IO is actually started and that
1343 * ordered extents get created before we return
1344 */
1345 atomic_inc(&root->fs_info->async_submit_draining);
1346 while (atomic_read(&root->fs_info->nr_async_submits) ||
1347 atomic_read(&root->fs_info->async_delalloc_pages)) {
1348 wait_event(root->fs_info->async_submit_wait,
1349 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1350 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1351 }
1352 atomic_dec(&root->fs_info->async_submit_draining);
1e701a32
CM		 1353 }
1354
1a419d85 1355 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1356 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1357 }
1358
60ccf82f 1359 ret = defrag_count;
940100a4 1360
4cb5300b 1361out_ra:
633085c7
FDBM		 1362 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1363 mutex_lock(&inode->i_mutex);
1364 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1365 mutex_unlock(&inode->i_mutex);
1366 }
4cb5300b
CM		 1367 if (!file)
1368 kfree(ra);
1369 kfree(pages);
940100a4 1370 return ret;
f46b5a66
CH		 1371}
1372
198605a8 1373static noinline int btrfs_ioctl_resize(struct file *file,
76dda93c 1374 void __user *arg)
f46b5a66
CH		 1375{
1376 u64 new_size;
1377 u64 old_size;
1378 u64 devid = 1;
496ad9aa 1379 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 1380 struct btrfs_ioctl_vol_args *vol_args;
1381 struct btrfs_trans_handle *trans;
1382 struct btrfs_device *device = NULL;
1383 char *sizestr;
1384 char *devstr = NULL;
1385 int ret = 0;
f46b5a66
CH		 1386 int mod = 0;
1387
e441d54d
CM		 1388 if (!capable(CAP_SYS_ADMIN))
1389 return -EPERM;
1390
198605a8
MX		 1391 ret = mnt_want_write_file(file);
1392 if (ret)
1393 return ret;
1394
5ac00add
SB		 1395 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1396 1)) {
97547676 1397 mnt_drop_write_file(file);
e57138b3 1398 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 1399 }
1400
5ac00add 1401 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 1402 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1403 if (IS_ERR(vol_args)) {
1404 ret = PTR_ERR(vol_args);
1405 goto out;
1406 }
5516e595
MF		 1407
1408 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1409
f46b5a66
CH		 1410 sizestr = vol_args->name;
1411 devstr = strchr(sizestr, ':');
1412 if (devstr) {
1413 char *end;
1414 sizestr = devstr + 1;
1415 *devstr = '\0';
1416 devstr = vol_args->name;
1417 devid = simple_strtoull(devstr, &end, 10);
dfd79829
MX		 1418 if (!devid) {
1419 ret = -EINVAL;
1420 goto out_free;
1421 }
c1c9ff7c 1422 printk(KERN_INFO "btrfs: resizing devid %llu\n", devid);
f46b5a66 1423 }
dba60f3f 1424
aa1b8cd4 1425 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1426 if (!device) {
5bb14682 1427 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
c1c9ff7c 1428 devid);
dfd79829 1429 ret = -ENODEV;
c9e9f97b 1430 goto out_free;
f46b5a66 1431 }
dba60f3f
MX		 1432
1433 if (!device->writeable) {
4e42ae1b 1434 printk(KERN_INFO "btrfs: resizer unable to apply on "
dba60f3f 1435 "readonly device %llu\n",
c1c9ff7c 1436 devid);
dfd79829 1437 ret = -EPERM;
4e42ae1b
LB		 1438 goto out_free;
1439 }
1440
f46b5a66
CH		 1441 if (!strcmp(sizestr, "max"))
1442 new_size = device->bdev->bd_inode->i_size;
1443 else {
1444 if (sizestr[0] == '-') {
1445 mod = -1;
1446 sizestr++;
1447 } else if (sizestr[0] == '+') {
1448 mod = 1;
1449 sizestr++;
1450 }
91748467 1451 new_size = memparse(sizestr, NULL);
f46b5a66
CH		 1452 if (new_size == 0) {
1453 ret = -EINVAL;
c9e9f97b 1454 goto out_free;
f46b5a66
CH		 1455 }
1456 }
1457
63a212ab 1458 if (device->is_tgtdev_for_dev_replace) {
dfd79829 1459 ret = -EPERM;
63a212ab
SB		 1460 goto out_free;
1461 }
1462
f46b5a66
CH		 1463 old_size = device->total_bytes;
1464
1465 if (mod < 0) {
1466 if (new_size > old_size) {
1467 ret = -EINVAL;
c9e9f97b 1468 goto out_free;
f46b5a66
CH		 1469 }
1470 new_size = old_size - new_size;
1471 } else if (mod > 0) {
1472 new_size = old_size + new_size;
1473 }
1474
1475 if (new_size < 256 * 1024 * 1024) {
1476 ret = -EINVAL;
c9e9f97b 1477 goto out_free;
f46b5a66
CH		 1478 }
1479 if (new_size > device->bdev->bd_inode->i_size) {
1480 ret = -EFBIG;
c9e9f97b 1481 goto out_free;
f46b5a66
CH		 1482 }
1483
1484 do_div(new_size, root->sectorsize);
1485 new_size *= root->sectorsize;
1486
606686ee 1487 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
c1c9ff7c 1488 rcu_str_deref(device->name), new_size);
f46b5a66
CH		 1489
1490 if (new_size > old_size) {
a22285a6 1491 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1492 if (IS_ERR(trans)) {
1493 ret = PTR_ERR(trans);
c9e9f97b 1494 goto out_free;
98d5dc13 1495 }
f46b5a66
CH		 1496 ret = btrfs_grow_device(trans, device, new_size);
1497 btrfs_commit_transaction(trans, root);
ece7d20e 1498 } else if (new_size < old_size) {
f46b5a66 1499 ret = btrfs_shrink_device(device, new_size);
0253f40e 1500 } /* equal, nothing need to do */
f46b5a66 1501
c9e9f97b 1502out_free:
f46b5a66 1503 kfree(vol_args);
c9e9f97b
ID		 1504out:
1505 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 1506 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
18f39c41 1507 mnt_drop_write_file(file);
f46b5a66
CH		 1508 return ret;
1509}
1510
72fd032e 1511static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1512 char *name, unsigned long fd, int subvol,
1513 u64 *transid, bool readonly,
8696c533 1514 struct btrfs_qgroup_inherit *inherit)
f46b5a66 1515{
f46b5a66 1516 int namelen;
3de4586c 1517 int ret = 0;
f46b5a66 1518
a874a63e
LB		 1519 ret = mnt_want_write_file(file);
1520 if (ret)
1521 goto out;
1522
72fd032e
SW		 1523 namelen = strlen(name);
1524 if (strchr(name, '/')) {
f46b5a66 1525 ret = -EINVAL;
a874a63e 1526 goto out_drop_write;
f46b5a66
CH		 1527 }
1528
16780cab
CM		 1529 if (name[0] == '.' &&
1530 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1531 ret = -EEXIST;
a874a63e 1532 goto out_drop_write;
16780cab
CM		 1533 }
1534
3de4586c 1535 if (subvol) {
72fd032e 1536 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1537 NULL, transid, readonly, inherit);
cb8e7090 1538 } else {
2903ff01 1539 struct fd src = fdget(fd);
3de4586c 1540 struct inode *src_inode;
2903ff01 1541 if (!src.file) {
3de4586c 1542 ret = -EINVAL;
a874a63e 1543 goto out_drop_write;
3de4586c
CM		 1544 }
1545
496ad9aa
AV		 1546 src_inode = file_inode(src.file);
1547 if (src_inode->i_sb != file_inode(file)->i_sb) {
d397712b
CM		 1548 printk(KERN_INFO "btrfs: Snapshot src from "
1549 "another FS\n");
3de4586c 1550 ret = -EINVAL;
ecd18815
AV		 1551 } else {
1552 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1553 BTRFS_I(src_inode)->root,
1554 transid, readonly, inherit);
3de4586c 1555 }
2903ff01 1556 fdput(src);
cb8e7090 1557 }
a874a63e
LB		 1558out_drop_write:
1559 mnt_drop_write_file(file);
f46b5a66 1560out:
72fd032e
SW		 1561 return ret;
1562}
1563
1564static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1565 void __user *arg, int subvol)
72fd032e 1566{
fa0d2b9b 1567 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1568 int ret;
1569
fa0d2b9b
LZ		 1570 vol_args = memdup_user(arg, sizeof(*vol_args));
1571 if (IS_ERR(vol_args))
1572 return PTR_ERR(vol_args);
1573 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1574
fa0d2b9b 1575 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1576 vol_args->fd, subvol,
6f72c7e2 1577 NULL, false, NULL);
fdfb1e4f 1578
fa0d2b9b
LZ		 1579 kfree(vol_args);
1580 return ret;
1581}
fdfb1e4f 1582
fa0d2b9b
LZ		 1583static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1584 void __user *arg, int subvol)
1585{
1586 struct btrfs_ioctl_vol_args_v2 *vol_args;
1587 int ret;
1588 u64 transid = 0;
1589 u64 *ptr = NULL;
b83cc969 1590 bool readonly = false;
6f72c7e2 1591 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1592
fa0d2b9b
LZ		 1593 vol_args = memdup_user(arg, sizeof(*vol_args));
1594 if (IS_ERR(vol_args))
1595 return PTR_ERR(vol_args);
1596 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1597
b83cc969 1598 if (vol_args->flags &
6f72c7e2
AJ		 1599 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1600 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1601 ret = -EOPNOTSUPP;
fa0d2b9b 1602 goto out;
72fd032e 1603 }
fa0d2b9b
LZ		 1604
1605 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1606 ptr = &transid;
b83cc969
LZ		 1607 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1608 readonly = true;
6f72c7e2
AJ		 1609 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1610 if (vol_args->size > PAGE_CACHE_SIZE) {
1611 ret = -EINVAL;
1612 goto out;
1613 }
1614 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1615 if (IS_ERR(inherit)) {
1616 ret = PTR_ERR(inherit);
1617 goto out;
1618 }
1619 }
fa0d2b9b
LZ		 1620
1621 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2 1622 vol_args->fd, subvol, ptr,
8696c533 1623 readonly, inherit);
fa0d2b9b
LZ		 1624
1625 if (ret == 0 && ptr &&
1626 copy_to_user(arg +
1627 offsetof(struct btrfs_ioctl_vol_args_v2,
1628 transid), ptr, sizeof(*ptr)))
1629 ret = -EFAULT;
fdfb1e4f 1630out:
f46b5a66 1631 kfree(vol_args);
6f72c7e2 1632 kfree(inherit);
f46b5a66
CH		 1633 return ret;
1634}
1635
0caa102d
LZ		 1636static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1637 void __user *arg)
1638{
496ad9aa 1639 struct inode *inode = file_inode(file);
0caa102d
LZ		 1640 struct btrfs_root *root = BTRFS_I(inode)->root;
1641 int ret = 0;
1642 u64 flags = 0;
1643
33345d01 1644 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1645 return -EINVAL;
1646
1647 down_read(&root->fs_info->subvol_sem);
1648 if (btrfs_root_readonly(root))
1649 flags |= BTRFS_SUBVOL_RDONLY;
1650 up_read(&root->fs_info->subvol_sem);
1651
1652 if (copy_to_user(arg, &flags, sizeof(flags)))
1653 ret = -EFAULT;
1654
1655 return ret;
1656}
1657
1658static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1659 void __user *arg)
1660{
496ad9aa 1661 struct inode *inode = file_inode(file);
0caa102d
LZ		 1662 struct btrfs_root *root = BTRFS_I(inode)->root;
1663 struct btrfs_trans_handle *trans;
1664 u64 root_flags;
1665 u64 flags;
1666 int ret = 0;
1667
b9ca0664
LB		 1668 ret = mnt_want_write_file(file);
1669 if (ret)
1670 goto out;
0caa102d 1671
b9ca0664
LB		 1672 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1673 ret = -EINVAL;
1674 goto out_drop_write;
1675 }
0caa102d 1676
b9ca0664
LB		 1677 if (copy_from_user(&flags, arg, sizeof(flags))) {
1678 ret = -EFAULT;
1679 goto out_drop_write;
1680 }
0caa102d 1681
b9ca0664
LB		 1682 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1683 ret = -EINVAL;
1684 goto out_drop_write;
1685 }
0caa102d 1686
b9ca0664
LB		 1687 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1688 ret = -EOPNOTSUPP;
1689 goto out_drop_write;
1690 }
0caa102d 1691
b9ca0664
LB		 1692 if (!inode_owner_or_capable(inode)) {
1693 ret = -EACCES;
1694 goto out_drop_write;
1695 }
b4dc2b8c 1696
0caa102d
LZ		 1697 down_write(&root->fs_info->subvol_sem);
1698
1699 /* nothing to do */
1700 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1701 goto out_drop_sem;
0caa102d
LZ		 1702
1703 root_flags = btrfs_root_flags(&root->root_item);
1704 if (flags & BTRFS_SUBVOL_RDONLY)
1705 btrfs_set_root_flags(&root->root_item,
1706 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1707 else
1708 btrfs_set_root_flags(&root->root_item,
1709 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1710
1711 trans = btrfs_start_transaction(root, 1);
1712 if (IS_ERR(trans)) {
1713 ret = PTR_ERR(trans);
1714 goto out_reset;
1715 }
1716
b4dc2b8c 1717 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1718 &root->root_key, &root->root_item);
1719
1720 btrfs_commit_transaction(trans, root);
1721out_reset:
1722 if (ret)
1723 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1724out_drop_sem:
0caa102d 1725 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1726out_drop_write:
1727 mnt_drop_write_file(file);
1728out:
0caa102d
LZ		 1729 return ret;
1730}
1731
76dda93c
YZ		 1732/*
1733 * helper to check if the subvolume references other subvolumes
1734 */
1735static noinline int may_destroy_subvol(struct btrfs_root *root)
1736{
1737 struct btrfs_path *path;
175a2b87 1738 struct btrfs_dir_item *di;
76dda93c 1739 struct btrfs_key key;
175a2b87 1740 u64 dir_id;
76dda93c
YZ		 1741 int ret;
1742
1743 path = btrfs_alloc_path();
1744 if (!path)
1745 return -ENOMEM;
1746
175a2b87
JB		 1747 /* Make sure this root isn't set as the default subvol */
1748 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1749 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1750 dir_id, "default", 7, 0);
1751 if (di && !IS_ERR(di)) {
1752 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1753 if (key.objectid == root->root_key.objectid) {
1754 ret = -ENOTEMPTY;
1755 goto out;
1756 }
1757 btrfs_release_path(path);
1758 }
1759
76dda93c
YZ		 1760 key.objectid = root->root_key.objectid;
1761 key.type = BTRFS_ROOT_REF_KEY;
1762 key.offset = (u64)-1;
1763
1764 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1765 &key, path, 0, 0);
1766 if (ret < 0)
1767 goto out;
1768 BUG_ON(ret == 0);
1769
1770 ret = 0;
1771 if (path->slots[0] > 0) {
1772 path->slots[0]--;
1773 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1774 if (key.objectid == root->root_key.objectid &&
1775 key.type == BTRFS_ROOT_REF_KEY)
1776 ret = -ENOTEMPTY;
1777 }
1778out:
1779 btrfs_free_path(path);
1780 return ret;
1781}
1782
ac8e9819
CM		 1783static noinline int key_in_sk(struct btrfs_key *key,
1784 struct btrfs_ioctl_search_key *sk)
1785{
abc6e134
CM		 1786 struct btrfs_key test;
1787 int ret;
1788
1789 test.objectid = sk->min_objectid;
1790 test.type = sk->min_type;
1791 test.offset = sk->min_offset;
1792
1793 ret = btrfs_comp_cpu_keys(key, &test);
1794 if (ret < 0)
ac8e9819 1795 return 0;
abc6e134
CM		 1796
1797 test.objectid = sk->max_objectid;
1798 test.type = sk->max_type;
1799 test.offset = sk->max_offset;
1800
1801 ret = btrfs_comp_cpu_keys(key, &test);
1802 if (ret > 0)
ac8e9819
CM		 1803 return 0;
1804 return 1;
1805}
1806
1807static noinline int copy_to_sk(struct btrfs_root *root,
1808 struct btrfs_path *path,
1809 struct btrfs_key *key,
1810 struct btrfs_ioctl_search_key *sk,
1811 char *buf,
1812 unsigned long *sk_offset,
1813 int *num_found)
1814{
1815 u64 found_transid;
1816 struct extent_buffer *leaf;
1817 struct btrfs_ioctl_search_header sh;
1818 unsigned long item_off;
1819 unsigned long item_len;
1820 int nritems;
1821 int i;
1822 int slot;
ac8e9819
CM		 1823 int ret = 0;
1824
1825 leaf = path->nodes[0];
1826 slot = path->slots[0];
1827 nritems = btrfs_header_nritems(leaf);
1828
1829 if (btrfs_header_generation(leaf) > sk->max_transid) {
1830 i = nritems;
1831 goto advance_key;
1832 }
1833 found_transid = btrfs_header_generation(leaf);
1834
1835 for (i = slot; i < nritems; i++) {
1836 item_off = btrfs_item_ptr_offset(leaf, i);
1837 item_len = btrfs_item_size_nr(leaf, i);
1838
03b71c6c
GP		 1839 btrfs_item_key_to_cpu(leaf, key, i);
1840 if (!key_in_sk(key, sk))
1841 continue;
1842
1843 if (sizeof(sh) + item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
ac8e9819
CM		 1844 item_len = 0;
1845
1846 if (sizeof(sh) + item_len + *sk_offset >
1847 BTRFS_SEARCH_ARGS_BUFSIZE) {
1848 ret = 1;
1849 goto overflow;
1850 }
1851
ac8e9819
CM		 1852 sh.objectid = key->objectid;
1853 sh.offset = key->offset;
1854 sh.type = key->type;
1855 sh.len = item_len;
1856 sh.transid = found_transid;
1857
1858 /* copy search result header */
1859 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1860 *sk_offset += sizeof(sh);
1861
1862 if (item_len) {
1863 char *p = buf + *sk_offset;
1864 /* copy the item */
1865 read_extent_buffer(leaf, p,
1866 item_off, item_len);
1867 *sk_offset += item_len;
ac8e9819 1868 }
e2156867 1869 (*num_found)++;
ac8e9819
CM		 1870
1871 if (*num_found >= sk->nr_items)
1872 break;
1873 }
1874advance_key:
abc6e134
CM		 1875 ret = 0;
1876 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1877 key->offset++;
abc6e134
CM		 1878 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1879 key->offset = 0;
ac8e9819 1880 key->type++;
abc6e134
CM		 1881 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1882 key->offset = 0;
1883 key->type = 0;
ac8e9819 1884 key->objectid++;
abc6e134
CM		 1885 } else
1886 ret = 1;
ac8e9819 1887overflow:
ac8e9819
CM		 1888 return ret;
1889}
1890
1891static noinline int search_ioctl(struct inode *inode,
1892 struct btrfs_ioctl_search_args *args)
1893{
1894 struct btrfs_root *root;
1895 struct btrfs_key key;
1896 struct btrfs_key max_key;
1897 struct btrfs_path *path;
1898 struct btrfs_ioctl_search_key *sk = &args->key;
1899 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1900 int ret;
1901 int num_found = 0;
1902 unsigned long sk_offset = 0;
1903
1904 path = btrfs_alloc_path();
1905 if (!path)
1906 return -ENOMEM;
1907
1908 if (sk->tree_id == 0) {
1909 /* search the root of the inode that was passed */
1910 root = BTRFS_I(inode)->root;
1911 } else {
1912 key.objectid = sk->tree_id;
1913 key.type = BTRFS_ROOT_ITEM_KEY;
1914 key.offset = (u64)-1;
1915 root = btrfs_read_fs_root_no_name(info, &key);
1916 if (IS_ERR(root)) {
1917 printk(KERN_ERR "could not find root %llu\n",
1918 sk->tree_id);
1919 btrfs_free_path(path);
1920 return -ENOENT;
1921 }
1922 }
1923
1924 key.objectid = sk->min_objectid;
1925 key.type = sk->min_type;
1926 key.offset = sk->min_offset;
1927
1928 max_key.objectid = sk->max_objectid;
1929 max_key.type = sk->max_type;
1930 max_key.offset = sk->max_offset;
1931
1932 path->keep_locks = 1;
1933
1934 while(1) {
de78b51a 1935 ret = btrfs_search_forward(root, &key, &max_key, path,
ac8e9819
CM		 1936 sk->min_transid);
1937 if (ret != 0) {
1938 if (ret > 0)
1939 ret = 0;
1940 goto err;
1941 }
1942 ret = copy_to_sk(root, path, &key, sk, args->buf,
1943 &sk_offset, &num_found);
b3b4aa74 1944 btrfs_release_path(path);
ac8e9819
CM		 1945 if (ret || num_found >= sk->nr_items)
1946 break;
1947
1948 }
1949 ret = 0;
1950err:
1951 sk->nr_items = num_found;
1952 btrfs_free_path(path);
1953 return ret;
1954}
1955
1956static noinline int btrfs_ioctl_tree_search(struct file *file,
1957 void __user *argp)
1958{
1959 struct btrfs_ioctl_search_args *args;
1960 struct inode *inode;
1961 int ret;
1962
1963 if (!capable(CAP_SYS_ADMIN))
1964 return -EPERM;
1965
2354d08f
JL		 1966 args = memdup_user(argp, sizeof(*args));
1967 if (IS_ERR(args))
1968 return PTR_ERR(args);
ac8e9819 1969
496ad9aa 1970 inode = file_inode(file);
ac8e9819
CM		 1971 ret = search_ioctl(inode, args);
1972 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1973 ret = -EFAULT;
1974 kfree(args);
1975 return ret;
1976}
1977
98d377a0 1978/*
ac8e9819
CM		 1979 * Search INODE_REFs to identify path name of 'dirid' directory
1980 * in a 'tree_id' tree. and sets path name to 'name'.
1981 */
98d377a0
TH		 1982static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1983 u64 tree_id, u64 dirid, char *name)
1984{
1985 struct btrfs_root *root;
1986 struct btrfs_key key;
ac8e9819 1987 char *ptr;
98d377a0
TH		 1988 int ret = -1;
1989 int slot;
1990 int len;
1991 int total_len = 0;
1992 struct btrfs_inode_ref *iref;
1993 struct extent_buffer *l;
1994 struct btrfs_path *path;
1995
1996 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1997 name[0]='\0';
1998 return 0;
1999 }
2000
2001 path = btrfs_alloc_path();
2002 if (!path)
2003 return -ENOMEM;
2004
ac8e9819 2005 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 2006
2007 key.objectid = tree_id;
2008 key.type = BTRFS_ROOT_ITEM_KEY;
2009 key.offset = (u64)-1;
2010 root = btrfs_read_fs_root_no_name(info, &key);
2011 if (IS_ERR(root)) {
2012 printk(KERN_ERR "could not find root %llu\n", tree_id);
8ad6fcab
CM		 2013 ret = -ENOENT;
2014 goto out;
98d377a0
TH		 2015 }
2016
2017 key.objectid = dirid;
2018 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 2019 key.offset = (u64)-1;
98d377a0
TH		 2020
2021 while(1) {
2022 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2023 if (ret < 0)
2024 goto out;
18674c6c
FDBM		 2025 else if (ret > 0) {
2026 ret = btrfs_previous_item(root, path, dirid,
2027 BTRFS_INODE_REF_KEY);
2028 if (ret < 0)
2029 goto out;
2030 else if (ret > 0) {
2031 ret = -ENOENT;
2032 goto out;
2033 }
2034 }
98d377a0
TH		 2035
2036 l = path->nodes[0];
2037 slot = path->slots[0];
2038 btrfs_item_key_to_cpu(l, &key, slot);
2039
98d377a0
TH		 2040 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2041 len = btrfs_inode_ref_name_len(l, iref);
2042 ptr -= len + 1;
2043 total_len += len + 1;
a696cf35
FDBM		 2044 if (ptr < name) {
2045 ret = -ENAMETOOLONG;
98d377a0 2046 goto out;
a696cf35 2047 }
98d377a0
TH		 2048
2049 *(ptr + len) = '/';
2050 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
2051
2052 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2053 break;
2054
b3b4aa74 2055 btrfs_release_path(path);
98d377a0 2056 key.objectid = key.offset;
8ad6fcab 2057 key.offset = (u64)-1;
98d377a0 2058 dirid = key.objectid;
98d377a0 2059 }
77906a50 2060 memmove(name, ptr, total_len);
98d377a0
TH		 2061 name[total_len]='\0';
2062 ret = 0;
2063out:
2064 btrfs_free_path(path);
ac8e9819
CM		 2065 return ret;
2066}
2067
2068static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2069 void __user *argp)
2070{
2071 struct btrfs_ioctl_ino_lookup_args *args;
2072 struct inode *inode;
2073 int ret;
2074
2075 if (!capable(CAP_SYS_ADMIN))
2076 return -EPERM;
2077
2354d08f
JL		 2078 args = memdup_user(argp, sizeof(*args));
2079 if (IS_ERR(args))
2080 return PTR_ERR(args);
c2b96929 2081
496ad9aa 2082 inode = file_inode(file);
ac8e9819 2083
1b53ac4d
CM		 2084 if (args->treeid == 0)
2085 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2086
ac8e9819
CM		 2087 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2088 args->treeid, args->objectid,
2089 args->name);
2090
2091 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2092 ret = -EFAULT;
2093
2094 kfree(args);
98d377a0
TH		 2095 return ret;
2096}
2097
76dda93c
YZ		 2098static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2099 void __user *arg)
2100{
2101 struct dentry *parent = fdentry(file);
2102 struct dentry *dentry;
2103 struct inode *dir = parent->d_inode;
2104 struct inode *inode;
2105 struct btrfs_root *root = BTRFS_I(dir)->root;
2106 struct btrfs_root *dest = NULL;
2107 struct btrfs_ioctl_vol_args *vol_args;
2108 struct btrfs_trans_handle *trans;
c58aaad2
MX		 2109 struct btrfs_block_rsv block_rsv;
2110 u64 qgroup_reserved;
76dda93c
YZ		 2111 int namelen;
2112 int ret;
2113 int err = 0;
2114
76dda93c
YZ		 2115 vol_args = memdup_user(arg, sizeof(*vol_args));
2116 if (IS_ERR(vol_args))
2117 return PTR_ERR(vol_args);
2118
2119 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2120 namelen = strlen(vol_args->name);
2121 if (strchr(vol_args->name, '/') ||
2122 strncmp(vol_args->name, "..", namelen) == 0) {
2123 err = -EINVAL;
2124 goto out;
2125 }
2126
a561be71 2127 err = mnt_want_write_file(file);
76dda93c
YZ		 2128 if (err)
2129 goto out;
2130
5c50c9b8
DS		 2131 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2132 if (err == -EINTR)
2133 goto out;
76dda93c
YZ		 2134 dentry = lookup_one_len(vol_args->name, parent, namelen);
2135 if (IS_ERR(dentry)) {
2136 err = PTR_ERR(dentry);
2137 goto out_unlock_dir;
2138 }
2139
2140 if (!dentry->d_inode) {
2141 err = -ENOENT;
2142 goto out_dput;
2143 }
2144
2145 inode = dentry->d_inode;
4260f7c7
SW		 2146 dest = BTRFS_I(inode)->root;
2147 if (!capable(CAP_SYS_ADMIN)){
2148 /*
2149 * Regular user. Only allow this with a special mount
2150 * option, when the user has write+exec access to the
2151 * subvol root, and when rmdir(2) would have been
2152 * allowed.
2153 *
2154 * Note that this is _not_ check that the subvol is
2155 * empty or doesn't contain data that we wouldn't
2156 * otherwise be able to delete.
2157 *
2158 * Users who want to delete empty subvols should try
2159 * rmdir(2).
2160 */
2161 err = -EPERM;
2162 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2163 goto out_dput;
2164
2165 /*
2166 * Do not allow deletion if the parent dir is the same
2167 * as the dir to be deleted. That means the ioctl
2168 * must be called on the dentry referencing the root
2169 * of the subvol, not a random directory contained
2170 * within it.
2171 */
2172 err = -EINVAL;
2173 if (root == dest)
2174 goto out_dput;
2175
2176 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2177 if (err)
2178 goto out_dput;
4260f7c7
SW		 2179 }
2180
5c39da5b
MX		 2181 /* check if subvolume may be deleted by a user */
2182 err = btrfs_may_delete(dir, dentry, 1);
2183 if (err)
2184 goto out_dput;
2185
33345d01 2186 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2187 err = -EINVAL;
2188 goto out_dput;
2189 }
2190
76dda93c
YZ		 2191 mutex_lock(&inode->i_mutex);
2192 err = d_invalidate(dentry);
2193 if (err)
2194 goto out_unlock;
2195
2196 down_write(&root->fs_info->subvol_sem);
2197
2198 err = may_destroy_subvol(dest);
2199 if (err)
2200 goto out_up_write;
2201
c58aaad2
MX		 2202 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2203 /*
2204 * One for dir inode, two for dir entries, two for root
2205 * ref/backref.
2206 */
2207 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
ee3441b4 2208 5, &qgroup_reserved, true);
c58aaad2
MX		 2209 if (err)
2210 goto out_up_write;
2211
a22285a6
YZ		 2212 trans = btrfs_start_transaction(root, 0);
2213 if (IS_ERR(trans)) {
2214 err = PTR_ERR(trans);
c58aaad2 2215 goto out_release;
a22285a6 2216 }
c58aaad2
MX		 2217 trans->block_rsv = &block_rsv;
2218 trans->bytes_reserved = block_rsv.size;
a22285a6 2219
76dda93c
YZ		 2220 ret = btrfs_unlink_subvol(trans, root, dir,
2221 dest->root_key.objectid,
2222 dentry->d_name.name,
2223 dentry->d_name.len);
79787eaa
JM		 2224 if (ret) {
2225 err = ret;
2226 btrfs_abort_transaction(trans, root, ret);
2227 goto out_end_trans;
2228 }
76dda93c
YZ		 2229
2230 btrfs_record_root_in_trans(trans, dest);
2231
2232 memset(&dest->root_item.drop_progress, 0,
2233 sizeof(dest->root_item.drop_progress));
2234 dest->root_item.drop_level = 0;
2235 btrfs_set_root_refs(&dest->root_item, 0);
2236
d68fc57b
YZ		 2237 if (!xchg(&dest->orphan_item_inserted, 1)) {
2238 ret = btrfs_insert_orphan_item(trans,
2239 root->fs_info->tree_root,
2240 dest->root_key.objectid);
79787eaa
JM		 2241 if (ret) {
2242 btrfs_abort_transaction(trans, root, ret);
2243 err = ret;
2244 goto out_end_trans;
2245 }
d68fc57b 2246 }
dd5f9615
SB		 2247
2248 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2249 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2250 dest->root_key.objectid);
2251 if (ret && ret != -ENOENT) {
2252 btrfs_abort_transaction(trans, root, ret);
2253 err = ret;
2254 goto out_end_trans;
2255 }
2256 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2257 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2258 dest->root_item.received_uuid,
2259 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2260 dest->root_key.objectid);
2261 if (ret && ret != -ENOENT) {
2262 btrfs_abort_transaction(trans, root, ret);
2263 err = ret;
2264 goto out_end_trans;
2265 }
2266 }
2267
79787eaa 2268out_end_trans:
c58aaad2
MX		 2269 trans->block_rsv = NULL;
2270 trans->bytes_reserved = 0;
531cb13f 2271 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2272 if (ret && !err)
2273 err = ret;
76dda93c 2274 inode->i_flags |= S_DEAD;
c58aaad2
MX		 2275out_release:
2276 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
76dda93c
YZ		 2277out_up_write:
2278 up_write(&root->fs_info->subvol_sem);
2279out_unlock:
2280 mutex_unlock(&inode->i_mutex);
2281 if (!err) {
efefb143 2282 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2283 btrfs_invalidate_inodes(dest);
2284 d_delete(dentry);
fa6ac876
LB		 2285
2286 /* the last ref */
2287 if (dest->cache_inode) {
2288 iput(dest->cache_inode);
2289 dest->cache_inode = NULL;
2290 }
76dda93c
YZ		 2291 }
2292out_dput:
2293 dput(dentry);
2294out_unlock_dir:
2295 mutex_unlock(&dir->i_mutex);
2a79f17e 2296 mnt_drop_write_file(file);
76dda93c
YZ		 2297out:
2298 kfree(vol_args);
2299 return err;
2300}
2301
1e701a32 2302static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66 2303{
496ad9aa 2304 struct inode *inode = file_inode(file);
f46b5a66 2305 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2306 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2307 int ret;
2308
25122d15
ID		 2309 ret = mnt_want_write_file(file);
2310 if (ret)
2311 return ret;
b83cc969 2312
25122d15
ID		 2313 if (btrfs_root_readonly(root)) {
2314 ret = -EROFS;
2315 goto out;
5ac00add 2316 }
f46b5a66
CH		 2317
2318 switch (inode->i_mode & S_IFMT) {
2319 case S_IFDIR:
e441d54d
CM		 2320 if (!capable(CAP_SYS_ADMIN)) {
2321 ret = -EPERM;
2322 goto out;
2323 }
de78b51a 2324 ret = btrfs_defrag_root(root);
8929ecfa
YZ		 2325 if (ret)
2326 goto out;
de78b51a 2327 ret = btrfs_defrag_root(root->fs_info->extent_root);
f46b5a66
CH		 2328 break;
2329 case S_IFREG:
e441d54d
CM		 2330 if (!(file->f_mode & FMODE_WRITE)) {
2331 ret = -EINVAL;
2332 goto out;
2333 }
1e701a32
CM		 2334
2335 range = kzalloc(sizeof(*range), GFP_KERNEL);
2336 if (!range) {
2337 ret = -ENOMEM;
2338 goto out;
2339 }
2340
2341 if (argp) {
2342 if (copy_from_user(range, argp,
2343 sizeof(*range))) {
2344 ret = -EFAULT;
2345 kfree(range);
683be16e 2346 goto out;
1e701a32
CM		 2347 }
2348 /* compression requires us to start the IO */
2349 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2350 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2351 range->extent_thresh = (u32)-1;
2352 }
2353 } else {
2354 /* the rest are all set to zero by kzalloc */
2355 range->len = (u64)-1;
2356 }
496ad9aa 2357 ret = btrfs_defrag_file(file_inode(file), file,
4cb5300b
CM		 2358 range, 0, 0);
2359 if (ret > 0)
2360 ret = 0;
1e701a32 2361 kfree(range);
f46b5a66 2362 break;
8929ecfa
YZ		 2363 default:
2364 ret = -EINVAL;
f46b5a66 2365 }
e441d54d 2366out:
25122d15 2367 mnt_drop_write_file(file);
e441d54d 2368 return ret;
f46b5a66
CH		 2369}
2370
b2950863 2371static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2372{
2373 struct btrfs_ioctl_vol_args *vol_args;
2374 int ret;
2375
e441d54d
CM		 2376 if (!capable(CAP_SYS_ADMIN))
2377 return -EPERM;
2378
5ac00add
SB		 2379 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2380 1)) {
e57138b3 2381 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
c9e9f97b
ID		 2382 }
2383
5ac00add 2384 mutex_lock(&root->fs_info->volume_mutex);
dae7b665 2385 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2386 if (IS_ERR(vol_args)) {
2387 ret = PTR_ERR(vol_args);
2388 goto out;
2389 }
f46b5a66 2390
5516e595 2391 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2392 ret = btrfs_init_new_device(root, vol_args->name);
2393
f46b5a66 2394 kfree(vol_args);
c9e9f97b
ID		 2395out:
2396 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2397 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
f46b5a66
CH		 2398 return ret;
2399}
2400
da24927b 2401static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
f46b5a66 2402{
496ad9aa 2403 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
f46b5a66
CH		 2404 struct btrfs_ioctl_vol_args *vol_args;
2405 int ret;
2406
e441d54d
CM		 2407 if (!capable(CAP_SYS_ADMIN))
2408 return -EPERM;
2409
da24927b
MX		 2410 ret = mnt_want_write_file(file);
2411 if (ret)
2412 return ret;
c146afad 2413
dae7b665 2414 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2415 if (IS_ERR(vol_args)) {
2416 ret = PTR_ERR(vol_args);
2417 goto out;
2418 }
f46b5a66 2419
5516e595 2420 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 2421
183860f6
AJ		 2422 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2423 1)) {
2424 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2425 goto out;
2426 }
2427
2428 mutex_lock(&root->fs_info->volume_mutex);
2429 ret = btrfs_rm_device(root, vol_args->name);
c9e9f97b 2430 mutex_unlock(&root->fs_info->volume_mutex);
5ac00add 2431 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
183860f6
AJ		 2432
2433out:
2434 kfree(vol_args);
4ac20c70 2435 mnt_drop_write_file(file);
f46b5a66
CH		 2436 return ret;
2437}
2438
475f6387
JS		 2439static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2440{
027ed2f0 2441 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2442 struct btrfs_device *device;
2443 struct btrfs_device *next;
2444 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2445 int ret = 0;
475f6387
JS		 2446
2447 if (!capable(CAP_SYS_ADMIN))
2448 return -EPERM;
2449
027ed2f0
LZ		 2450 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2451 if (!fi_args)
2452 return -ENOMEM;
2453
f7171750 2454 mutex_lock(&fs_devices->device_list_mutex);
027ed2f0
LZ		 2455 fi_args->num_devices = fs_devices->num_devices;
2456 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387 2457
475f6387 2458 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2459 if (device->devid > fi_args->max_id)
2460 fi_args->max_id = device->devid;
475f6387
JS		 2461 }
2462 mutex_unlock(&fs_devices->device_list_mutex);
2463
027ed2f0
LZ		 2464 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2465 ret = -EFAULT;
475f6387 2466
027ed2f0
LZ		 2467 kfree(fi_args);
2468 return ret;
475f6387
JS		 2469}
2470
2471static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2472{
2473 struct btrfs_ioctl_dev_info_args *di_args;
2474 struct btrfs_device *dev;
2475 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2476 int ret = 0;
2477 char *s_uuid = NULL;
475f6387
JS		 2478
2479 if (!capable(CAP_SYS_ADMIN))
2480 return -EPERM;
2481
2482 di_args = memdup_user(arg, sizeof(*di_args));
2483 if (IS_ERR(di_args))
2484 return PTR_ERR(di_args);
2485
dd5f9615 2486 if (!btrfs_is_empty_uuid(di_args->uuid))
475f6387
JS		 2487 s_uuid = di_args->uuid;
2488
2489 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2490 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2491
2492 if (!dev) {
2493 ret = -ENODEV;
2494 goto out;
2495 }
2496
2497 di_args->devid = dev->devid;
2498 di_args->bytes_used = dev->bytes_used;
2499 di_args->total_bytes = dev->total_bytes;
2500 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2501 if (dev->name) {
606686ee
JB		 2502 struct rcu_string *name;
2503
2504 rcu_read_lock();
2505 name = rcu_dereference(dev->name);
2506 strncpy(di_args->path, name->str, sizeof(di_args->path));
2507 rcu_read_unlock();
a27202fb
JM		 2508 di_args->path[sizeof(di_args->path) - 1] = 0;
2509 } else {
99ba55ad 2510 di_args->path[0] = '\0';
a27202fb 2511 }
475f6387
JS		 2512
2513out:
55793c0d 2514 mutex_unlock(&fs_devices->device_list_mutex);
475f6387
JS		 2515 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2516 ret = -EFAULT;
2517
2518 kfree(di_args);
2519 return ret;
2520}
2521
416161db
MF		 2522static struct page *extent_same_get_page(struct inode *inode, u64 off)
2523{
2524 struct page *page;
2525 pgoff_t index;
2526 struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
2527
2528 index = off >> PAGE_CACHE_SHIFT;
2529
2530 page = grab_cache_page(inode->i_mapping, index);
2531 if (!page)
2532 return NULL;
2533
2534 if (!PageUptodate(page)) {
2535 if (extent_read_full_page_nolock(tree, page, btrfs_get_extent,
2536 0))
2537 return NULL;
2538 lock_page(page);
2539 if (!PageUptodate(page)) {
2540 unlock_page(page);
2541 page_cache_release(page);
2542 return NULL;
2543 }
2544 }
2545 unlock_page(page);
2546
2547 return page;
2548}
2549
77fe20dc
MF		 2550static inline void lock_extent_range(struct inode *inode, u64 off, u64 len)
2551{
2552 /* do any pending delalloc/csum calc on src, one way or
2553 another, and lock file content */
2554 while (1) {
2555 struct btrfs_ordered_extent *ordered;
2556 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2557 ordered = btrfs_lookup_first_ordered_extent(inode,
2558 off + len - 1);
2559 if (!ordered &&
2560 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2561 off + len - 1, EXTENT_DELALLOC, 0, NULL))
2562 break;
2563 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2564 if (ordered)
2565 btrfs_put_ordered_extent(ordered);
2566 btrfs_wait_ordered_range(inode, off, len);
2567 }
2568}
2569
416161db
MF		 2570static void btrfs_double_unlock(struct inode *inode1, u64 loff1,
2571 struct inode *inode2, u64 loff2, u64 len)
2572{
2573 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2574 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2575
2576 mutex_unlock(&inode1->i_mutex);
2577 mutex_unlock(&inode2->i_mutex);
2578}
2579
2580static void btrfs_double_lock(struct inode *inode1, u64 loff1,
2581 struct inode *inode2, u64 loff2, u64 len)
2582{
2583 if (inode1 < inode2) {
2584 swap(inode1, inode2);
2585 swap(loff1, loff2);
2586 }
2587
2588 mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT);
2589 lock_extent_range(inode1, loff1, len);
2590 if (inode1 != inode2) {
2591 mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD);
2592 lock_extent_range(inode2, loff2, len);
2593 }
2594}
2595
2596static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2597 u64 dst_loff, u64 len)
2598{
2599 int ret = 0;
2600 struct page *src_page, *dst_page;
2601 unsigned int cmp_len = PAGE_CACHE_SIZE;
2602 void *addr, *dst_addr;
2603
2604 while (len) {
2605 if (len < PAGE_CACHE_SIZE)
2606 cmp_len = len;
2607
2608 src_page = extent_same_get_page(src, loff);
2609 if (!src_page)
2610 return -EINVAL;
2611 dst_page = extent_same_get_page(dst, dst_loff);
2612 if (!dst_page) {
2613 page_cache_release(src_page);
2614 return -EINVAL;
2615 }
2616 addr = kmap_atomic(src_page);
2617 dst_addr = kmap_atomic(dst_page);
2618
2619 flush_dcache_page(src_page);
2620 flush_dcache_page(dst_page);
2621
2622 if (memcmp(addr, dst_addr, cmp_len))
2623 ret = BTRFS_SAME_DATA_DIFFERS;
2624
2625 kunmap_atomic(addr);
2626 kunmap_atomic(dst_addr);
2627 page_cache_release(src_page);
2628 page_cache_release(dst_page);
2629
2630 if (ret)
2631 break;
2632
2633 loff += cmp_len;
2634 dst_loff += cmp_len;
2635 len -= cmp_len;
2636 }
2637
2638 return ret;
2639}
2640
2641static int extent_same_check_offsets(struct inode *inode, u64 off, u64 len)
2642{
2643 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
2644
2645 if (off + len > inode->i_size || off + len < off)
2646 return -EINVAL;
2647 /* Check that we are block aligned - btrfs_clone() requires this */
2648 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
2649 return -EINVAL;
2650
2651 return 0;
2652}
2653
2654static int btrfs_extent_same(struct inode *src, u64 loff, u64 len,
2655 struct inode *dst, u64 dst_loff)
2656{
2657 int ret;
2658
2659 /*
2660 * btrfs_clone() can't handle extents in the same file
2661 * yet. Once that works, we can drop this check and replace it
2662 * with a check for the same inode, but overlapping extents.
2663 */
2664 if (src == dst)
2665 return -EINVAL;
2666
2667 btrfs_double_lock(src, loff, dst, dst_loff, len);
2668
2669 ret = extent_same_check_offsets(src, loff, len);
2670 if (ret)
2671 goto out_unlock;
2672
2673 ret = extent_same_check_offsets(dst, dst_loff, len);
2674 if (ret)
2675 goto out_unlock;
2676
2677 /* don't make the dst file partly checksummed */
2678 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2679 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
2680 ret = -EINVAL;
2681 goto out_unlock;
2682 }
2683
2684 ret = btrfs_cmp_data(src, loff, dst, dst_loff, len);
2685 if (ret == 0)
2686 ret = btrfs_clone(src, dst, loff, len, len, dst_loff);
2687
2688out_unlock:
2689 btrfs_double_unlock(src, loff, dst, dst_loff, len);
2690
2691 return ret;
2692}
2693
2694#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
2695
2696static long btrfs_ioctl_file_extent_same(struct file *file,
2697 void __user *argp)
2698{
2699 struct btrfs_ioctl_same_args *args = argp;
2700 struct btrfs_ioctl_same_args same;
2701 struct btrfs_ioctl_same_extent_info info;
2702 struct inode *src = file->f_dentry->d_inode;
2703 struct file *dst_file = NULL;
2704 struct inode *dst;
2705 u64 off;
2706 u64 len;
2707 int i;
2708 int ret;
2709 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
2710 bool is_admin = capable(CAP_SYS_ADMIN);
2711
2712 if (!(file->f_mode & FMODE_READ))
2713 return -EINVAL;
2714
2715 ret = mnt_want_write_file(file);
2716 if (ret)
2717 return ret;
2718
2719 if (copy_from_user(&same,
2720 (struct btrfs_ioctl_same_args __user *)argp,
2721 sizeof(same))) {
2722 ret = -EFAULT;
2723 goto out;
2724 }
2725
2726 off = same.logical_offset;
2727 len = same.length;
2728
2729 /*
2730 * Limit the total length we will dedupe for each operation.
2731 * This is intended to bound the total time spent in this
2732 * ioctl to something sane.
2733 */
2734 if (len > BTRFS_MAX_DEDUPE_LEN)
2735 len = BTRFS_MAX_DEDUPE_LEN;
2736
2737 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
2738 /*
2739 * Btrfs does not support blocksize < page_size. As a
2740 * result, btrfs_cmp_data() won't correctly handle
2741 * this situation without an update.
2742 */
2743 ret = -EINVAL;
2744 goto out;
2745 }
2746
2747 ret = -EISDIR;
2748 if (S_ISDIR(src->i_mode))
2749 goto out;
2750
2751 ret = -EACCES;
2752 if (!S_ISREG(src->i_mode))
2753 goto out;
2754
2755 ret = 0;
2756 for (i = 0; i < same.dest_count; i++) {
2757 if (copy_from_user(&info, &args->info[i], sizeof(info))) {
2758 ret = -EFAULT;
2759 goto out;
2760 }
2761
2762 info.bytes_deduped = 0;
2763
2764 dst_file = fget(info.fd);
2765 if (!dst_file) {
2766 info.status = -EBADF;
2767 goto next;
2768 }
2769
2770 if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
2771 info.status = -EINVAL;
2772 goto next;
2773 }
2774
2775 info.status = -EXDEV;
2776 if (file->f_path.mnt != dst_file->f_path.mnt)
2777 goto next;
2778
2779 dst = dst_file->f_dentry->d_inode;
2780 if (src->i_sb != dst->i_sb)
2781 goto next;
2782
2783 if (S_ISDIR(dst->i_mode)) {
2784 info.status = -EISDIR;
2785 goto next;
2786 }
2787
2788 if (!S_ISREG(dst->i_mode)) {
2789 info.status = -EACCES;
2790 goto next;
2791 }
2792
2793 info.status = btrfs_extent_same(src, off, len, dst,
2794 info.logical_offset);
2795 if (info.status == 0)
2796 info.bytes_deduped += len;
2797
2798next:
2799 if (dst_file)
2800 fput(dst_file);
2801
2802 if (__put_user_unaligned(info.status, &args->info[i].status) ||
2803 __put_user_unaligned(info.bytes_deduped,
2804 &args->info[i].bytes_deduped)) {
2805 ret = -EFAULT;
2806 goto out;
2807 }
2808 }
2809
2810out:
2811 mnt_drop_write_file(file);
2812 return ret;
2813}
2814
32b7c687
MF		 2815/**
2816 * btrfs_clone() - clone a range from inode file to another
2817 *
2818 * @src: Inode to clone from
2819 * @inode: Inode to clone to
2820 * @off: Offset within source to start clone from
2821 * @olen: Original length, passed by user, of range to clone
2822 * @olen_aligned: Block-aligned value of olen, extent_same uses
2823 * identical values here
2824 * @destoff: Offset within @inode to start clone
2825 */
2826static int btrfs_clone(struct inode *src, struct inode *inode,
2827 u64 off, u64 olen, u64 olen_aligned, u64 destoff)
f46b5a66 2828{
f46b5a66 2829 struct btrfs_root *root = BTRFS_I(inode)->root;
32b7c687 2830 struct btrfs_path *path = NULL;
f46b5a66 2831 struct extent_buffer *leaf;
32b7c687
MF		 2832 struct btrfs_trans_handle *trans;
2833 char *buf = NULL;
ae01a0ab 2834 struct btrfs_key key;
f46b5a66
CH		 2835 u32 nritems;
2836 int slot;
ae01a0ab 2837 int ret;
32b7c687 2838 u64 len = olen_aligned;
ae01a0ab
YZ		 2839
2840 ret = -ENOMEM;
2841 buf = vmalloc(btrfs_level_size(root, 0));
2842 if (!buf)
32b7c687 2843 return ret;
ae01a0ab
YZ		 2844
2845 path = btrfs_alloc_path();
2846 if (!path) {
2847 vfree(buf);
32b7c687 2848 return ret;
d525e8ab
LZ		 2849 }
2850
32b7c687 2851 path->reada = 2;
c5c9cd4d 2852 /* clone data */
33345d01 2853 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2854 key.type = BTRFS_EXTENT_DATA_KEY;
2855 key.offset = 0;
f46b5a66
CH		 2856
2857 while (1) {
2858 /*
2859 * note the key will change type as we walk through the
2860 * tree.
2861 */
362a20c5
DS		 2862 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2863 0, 0);
f46b5a66
CH		 2864 if (ret < 0)
2865 goto out;
2866
ae01a0ab
YZ		 2867 nritems = btrfs_header_nritems(path->nodes[0]);
2868 if (path->slots[0] >= nritems) {
362a20c5 2869 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2870 if (ret < 0)
2871 goto out;
2872 if (ret > 0)
2873 break;
ae01a0ab 2874 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2875 }
2876 leaf = path->nodes[0];
2877 slot = path->slots[0];
f46b5a66 2878
ae01a0ab 2879 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 2880 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 2881 key.objectid != btrfs_ino(src))
f46b5a66
CH		 2882 break;
2883
c5c9cd4d
SW		 2884 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2885 struct btrfs_file_extent_item *extent;
2886 int type;
31840ae1
ZY		 2887 u32 size;
2888 struct btrfs_key new_key;
c5c9cd4d
SW		 2889 u64 disko = 0, diskl = 0;
2890 u64 datao = 0, datal = 0;
2891 u8 comp;
b5384d48 2892 u64 endoff;
31840ae1
ZY		 2893
2894 size = btrfs_item_size_nr(leaf, slot);
2895 read_extent_buffer(leaf, buf,
2896 btrfs_item_ptr_offset(leaf, slot),
2897 size);
c5c9cd4d
SW		 2898
2899 extent = btrfs_item_ptr(leaf, slot,
2900 struct btrfs_file_extent_item);
2901 comp = btrfs_file_extent_compression(leaf, extent);
2902 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 2903 if (type == BTRFS_FILE_EXTENT_REG ||
2904 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 2905 disko = btrfs_file_extent_disk_bytenr(leaf,
2906 extent);
2907 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2908 extent);
c5c9cd4d 2909 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 2910 datal = btrfs_file_extent_num_bytes(leaf,
2911 extent);
c5c9cd4d
SW		 2912 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2913 /* take upper bound, may be compressed */
2914 datal = btrfs_file_extent_ram_bytes(leaf,
2915 extent);
2916 }
b3b4aa74 2917 btrfs_release_path(path);
31840ae1 2918
050006a7 2919 if (key.offset + datal <= off ||
aa42ffd9 2920 key.offset >= off + len - 1)
c5c9cd4d
SW		 2921 goto next;
2922
31840ae1 2923 memcpy(&new_key, &key, sizeof(new_key));
33345d01 2924 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 2925 if (off <= key.offset)
2926 new_key.offset = key.offset + destoff - off;
2927 else
2928 new_key.offset = destoff;
31840ae1 2929
b6f3409b
SW		 2930 /*
2931 * 1 - adjusting old extent (we may have to split it)
2932 * 1 - add new extent
2933 * 1 - inode update
2934 */
2935 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 2936 if (IS_ERR(trans)) {
2937 ret = PTR_ERR(trans);
2938 goto out;
2939 }
2940
c8a894d7
CM		 2941 if (type == BTRFS_FILE_EXTENT_REG ||
2942 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 2943 /*
2944 * a | --- range to clone ---| b
2945 * | ------------- extent ------------- |
2946 */
2947
2948 /* substract range b */
2949 if (key.offset + datal > off + len)
2950 datal = off + len - key.offset;
2951
2952 /* substract range a */
a22285a6
YZ		 2953 if (off > key.offset) {
2954 datao += off - key.offset;
2955 datal -= off - key.offset;
2956 }
2957
5dc562c5 2958 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2959 new_key.offset,
2960 new_key.offset + datal,
2671485d 2961 1);
79787eaa
JM		 2962 if (ret) {
2963 btrfs_abort_transaction(trans, root,
2964 ret);
2965 btrfs_end_transaction(trans, root);
2966 goto out;
2967 }
a22285a6 2968
c5c9cd4d
SW		 2969 ret = btrfs_insert_empty_item(trans, root, path,
2970 &new_key, size);
79787eaa
JM		 2971 if (ret) {
2972 btrfs_abort_transaction(trans, root,
2973 ret);
2974 btrfs_end_transaction(trans, root);
2975 goto out;
2976 }
c5c9cd4d
SW		 2977
2978 leaf = path->nodes[0];
2979 slot = path->slots[0];
2980 write_extent_buffer(leaf, buf,
31840ae1
ZY		 2981 btrfs_item_ptr_offset(leaf, slot),
2982 size);
ae01a0ab 2983
c5c9cd4d 2984 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 2985 struct btrfs_file_extent_item);
c5c9cd4d 2986
c5c9cd4d
SW		 2987 /* disko == 0 means it's a hole */
2988 if (!disko)
2989 datao = 0;
c5c9cd4d
SW		 2990
2991 btrfs_set_file_extent_offset(leaf, extent,
2992 datao);
2993 btrfs_set_file_extent_num_bytes(leaf, extent,
2994 datal);
2995 if (disko) {
2996 inode_add_bytes(inode, datal);
ae01a0ab 2997 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 2998 disko, diskl, 0,
2999 root->root_key.objectid,
33345d01 3000 btrfs_ino(inode),
66d7e7f0
AJ		 3001 new_key.offset - datao,
3002 0);
79787eaa
JM		 3003 if (ret) {
3004 btrfs_abort_transaction(trans,
3005 root,
3006 ret);
3007 btrfs_end_transaction(trans,
3008 root);
3009 goto out;
3010
3011 }
f46b5a66 3012 }
c5c9cd4d
SW		 3013 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3014 u64 skip = 0;
3015 u64 trim = 0;
3016 if (off > key.offset) {
3017 skip = off - key.offset;
3018 new_key.offset += skip;
3019 }
d397712b 3020
aa42ffd9
LB		 3021 if (key.offset + datal > off + len)
3022 trim = key.offset + datal - (off + len);
d397712b 3023
c5c9cd4d 3024 if (comp && (skip || trim)) {
c5c9cd4d 3025 ret = -EINVAL;
a22285a6 3026 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 3027 goto out;
3028 }
3029 size -= skip + trim;
3030 datal -= skip + trim;
a22285a6 3031
5dc562c5 3032 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 3033 new_key.offset,
3034 new_key.offset + datal,
2671485d 3035 1);
79787eaa
JM		 3036 if (ret) {
3037 btrfs_abort_transaction(trans, root,
3038 ret);
3039 btrfs_end_transaction(trans, root);
3040 goto out;
3041 }
a22285a6 3042
c5c9cd4d
SW		 3043 ret = btrfs_insert_empty_item(trans, root, path,
3044 &new_key, size);
79787eaa
JM		 3045 if (ret) {
3046 btrfs_abort_transaction(trans, root,
3047 ret);
3048 btrfs_end_transaction(trans, root);
3049 goto out;
3050 }
c5c9cd4d
SW		 3051
3052 if (skip) {
d397712b
CM		 3053 u32 start =
3054 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 3055 memmove(buf+start, buf+start+skip,
3056 datal);
3057 }
3058
3059 leaf = path->nodes[0];
3060 slot = path->slots[0];
3061 write_extent_buffer(leaf, buf,
3062 btrfs_item_ptr_offset(leaf, slot),
3063 size);
3064 inode_add_bytes(inode, datal);
f46b5a66 3065 }
c5c9cd4d
SW		 3066
3067 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 3068 btrfs_release_path(path);
c5c9cd4d 3069
0c4d2d95 3070 inode_inc_iversion(inode);
a22285a6 3071 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 3072
3073 /*
3074 * we round up to the block size at eof when
3075 * determining which extents to clone above,
3076 * but shouldn't round up the file size
3077 */
3078 endoff = new_key.offset + datal;
5f3888ff
LZ		 3079 if (endoff > destoff+olen)
3080 endoff = destoff+olen;
b5384d48
SW		 3081 if (endoff > inode->i_size)
3082 btrfs_i_size_write(inode, endoff);
3083
a22285a6 3084 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 3085 if (ret) {
3086 btrfs_abort_transaction(trans, root, ret);
3087 btrfs_end_transaction(trans, root);
3088 goto out;
3089 }
3090 ret = btrfs_end_transaction(trans, root);
a22285a6 3091 }
d397712b 3092next:
b3b4aa74 3093 btrfs_release_path(path);
f46b5a66 3094 key.offset++;
f46b5a66 3095 }
f46b5a66 3096 ret = 0;
32b7c687 3097
f46b5a66 3098out:
b3b4aa74 3099 btrfs_release_path(path);
32b7c687
MF		 3100 btrfs_free_path(path);
3101 vfree(buf);
3102 return ret;
3103}
3104
3105static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
3106 u64 off, u64 olen, u64 destoff)
3107{
3108 struct inode *inode = fdentry(file)->d_inode;
3109 struct btrfs_root *root = BTRFS_I(inode)->root;
3110 struct fd src_file;
3111 struct inode *src;
3112 int ret;
3113 u64 len = olen;
3114 u64 bs = root->fs_info->sb->s_blocksize;
3115 int same_inode = 0;
3116
3117 /*
3118 * TODO:
3119 * - split compressed inline extents. annoying: we need to
3120 * decompress into destination's address_space (the file offset
3121 * may change, so source mapping won't do), then recompress (or
3122 * otherwise reinsert) a subrange.
3123 * - allow ranges within the same file to be cloned (provided
3124 * they don't overlap)?
3125 */
3126
3127 /* the destination must be opened for writing */
3128 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
3129 return -EINVAL;
3130
3131 if (btrfs_root_readonly(root))
3132 return -EROFS;
3133
3134 ret = mnt_want_write_file(file);
3135 if (ret)
3136 return ret;
3137
3138 src_file = fdget(srcfd);
3139 if (!src_file.file) {
3140 ret = -EBADF;
3141 goto out_drop_write;
3142 }
3143
3144 ret = -EXDEV;
3145 if (src_file.file->f_path.mnt != file->f_path.mnt)
3146 goto out_fput;
3147
3148 src = file_inode(src_file.file);
3149
3150 ret = -EINVAL;
3151 if (src == inode)
3152 same_inode = 1;
3153
3154 /* the src must be open for reading */
3155 if (!(src_file.file->f_mode & FMODE_READ))
3156 goto out_fput;
3157
3158 /* don't make the dst file partly checksummed */
3159 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3160 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3161 goto out_fput;
3162
3163 ret = -EISDIR;
3164 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3165 goto out_fput;
3166
3167 ret = -EXDEV;
3168 if (src->i_sb != inode->i_sb)
3169 goto out_fput;
3170
3171 if (!same_inode) {
3172 if (inode < src) {
3173 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
3174 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
3175 } else {
3176 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
3177 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
3178 }
3179 } else {
3180 mutex_lock(&src->i_mutex);
3181 }
3182
3183 /* determine range to clone */
3184 ret = -EINVAL;
3185 if (off + len > src->i_size || off + len < off)
3186 goto out_unlock;
3187 if (len == 0)
3188 olen = len = src->i_size - off;
3189 /* if we extend to eof, continue to block boundary */
3190 if (off + len == src->i_size)
3191 len = ALIGN(src->i_size, bs) - off;
3192
3193 /* verify the end result is block aligned */
3194 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3195 !IS_ALIGNED(destoff, bs))
3196 goto out_unlock;
3197
3198 /* verify if ranges are overlapped within the same file */
3199 if (same_inode) {
3200 if (destoff + len > off && destoff < off + len)
3201 goto out_unlock;
3202 }
3203
3204 if (destoff > inode->i_size) {
3205 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3206 if (ret)
3207 goto out_unlock;
3208 }
3209
3210 /* truncate page cache pages from target inode range */
3211 truncate_inode_pages_range(&inode->i_data, destoff,
3212 PAGE_CACHE_ALIGN(destoff + len) - 1);
3213
3214 lock_extent_range(src, off, len);
3215
3216 ret = btrfs_clone(src, inode, off, olen, len, destoff);
3217
aa42ffd9 3218 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66
CH		 3219out_unlock:
3220 mutex_unlock(&src->i_mutex);
a96fbc72
LB		 3221 if (!same_inode)
3222 mutex_unlock(&inode->i_mutex);
f46b5a66 3223out_fput:
2903ff01 3224 fdput(src_file);
ab67b7c1 3225out_drop_write:
2a79f17e 3226 mnt_drop_write_file(file);
f46b5a66
CH		 3227 return ret;
3228}
3229
7a865e8a 3230static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 3231{
3232 struct btrfs_ioctl_clone_range_args args;
3233
7a865e8a 3234 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 3235 return -EFAULT;
3236 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
3237 args.src_length, args.dest_offset);
3238}
3239
f46b5a66
CH		 3240/*
3241 * there are many ways the trans_start and trans_end ioctls can lead
3242 * to deadlocks. They should only be used by applications that
3243 * basically own the machine, and have a very in depth understanding
3244 * of all the possible deadlocks and enospc problems.
3245 */
b2950863 3246static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66 3247{
496ad9aa 3248 struct inode *inode = file_inode(file);
f46b5a66
CH		 3249 struct btrfs_root *root = BTRFS_I(inode)->root;
3250 struct btrfs_trans_handle *trans;
1ab86aed 3251 int ret;
f46b5a66 3252
1ab86aed 3253 ret = -EPERM;
df5b5520 3254 if (!capable(CAP_SYS_ADMIN))
1ab86aed 3255 goto out;
df5b5520 3256
1ab86aed
SW		 3257 ret = -EINPROGRESS;
3258 if (file->private_data)
f46b5a66 3259 goto out;
9ca9ee09 3260
b83cc969
LZ		 3261 ret = -EROFS;
3262 if (btrfs_root_readonly(root))
3263 goto out;
3264
a561be71 3265 ret = mnt_want_write_file(file);
c146afad
YZ		 3266 if (ret)
3267 goto out;
3268
a4abeea4 3269 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 3270
1ab86aed 3271 ret = -ENOMEM;
7a7eaa40 3272 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 3273 if (IS_ERR(trans))
1ab86aed
SW		 3274 goto out_drop;
3275
3276 file->private_data = trans;
3277 return 0;
3278
3279out_drop:
a4abeea4 3280 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 3281 mnt_drop_write_file(file);
f46b5a66 3282out:
f46b5a66
CH		 3283 return ret;
3284}
3285
6ef5ed0d
JB		 3286static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3287{
496ad9aa 3288 struct inode *inode = file_inode(file);
6ef5ed0d
JB		 3289 struct btrfs_root *root = BTRFS_I(inode)->root;
3290 struct btrfs_root *new_root;
3291 struct btrfs_dir_item *di;
3292 struct btrfs_trans_handle *trans;
3293 struct btrfs_path *path;
3294 struct btrfs_key location;
3295 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 3296 u64 objectid = 0;
3297 u64 dir_id;
3c04ce01 3298 int ret;
6ef5ed0d
JB		 3299
3300 if (!capable(CAP_SYS_ADMIN))
3301 return -EPERM;
3302
3c04ce01
MX		 3303 ret = mnt_want_write_file(file);
3304 if (ret)
3305 return ret;
3306
3307 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3308 ret = -EFAULT;
3309 goto out;
3310 }
6ef5ed0d
JB		 3311
3312 if (!objectid)
3313 objectid = root->root_key.objectid;
3314
3315 location.objectid = objectid;
3316 location.type = BTRFS_ROOT_ITEM_KEY;
3317 location.offset = (u64)-1;
3318
3319 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3c04ce01
MX		 3320 if (IS_ERR(new_root)) {
3321 ret = PTR_ERR(new_root);
3322 goto out;
3323 }
6ef5ed0d 3324
6ef5ed0d 3325 path = btrfs_alloc_path();
3c04ce01
MX		 3326 if (!path) {
3327 ret = -ENOMEM;
3328 goto out;
3329 }
6ef5ed0d
JB		 3330 path->leave_spinning = 1;
3331
3332 trans = btrfs_start_transaction(root, 1);
98d5dc13 3333 if (IS_ERR(trans)) {
6ef5ed0d 3334 btrfs_free_path(path);
3c04ce01
MX		 3335 ret = PTR_ERR(trans);
3336 goto out;
6ef5ed0d
JB		 3337 }
3338
6c41761f 3339 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 3340 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
3341 dir_id, "default", 7, 1);
cf1e99a4 3342 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 3343 btrfs_free_path(path);
3344 btrfs_end_transaction(trans, root);
3345 printk(KERN_ERR "Umm, you don't have the default dir item, "
3346 "this isn't going to work\n");
3c04ce01
MX		 3347 ret = -ENOENT;
3348 goto out;
6ef5ed0d
JB		 3349 }
3350
3351 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3352 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3353 btrfs_mark_buffer_dirty(path->nodes[0]);
3354 btrfs_free_path(path);
3355
2b0ce2c2 3356 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d 3357 btrfs_end_transaction(trans, root);
3c04ce01
MX		 3358out:
3359 mnt_drop_write_file(file);
3360 return ret;
6ef5ed0d
JB		 3361}
3362
5af3e8cc
SB		 3363void btrfs_get_block_group_info(struct list_head *groups_list,
3364 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 3365{
3366 struct btrfs_block_group_cache *block_group;
3367
3368 space->total_bytes = 0;
3369 space->used_bytes = 0;
3370 space->flags = 0;
3371 list_for_each_entry(block_group, groups_list, list) {
3372 space->flags = block_group->flags;
3373 space->total_bytes += block_group->key.offset;
3374 space->used_bytes +=
3375 btrfs_block_group_used(&block_group->item);
3376 }
3377}
3378
48a3b636 3379static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
1406e432
JB		 3380{
3381 struct btrfs_ioctl_space_args space_args;
3382 struct btrfs_ioctl_space_info space;
3383 struct btrfs_ioctl_space_info *dest;
7fde62bf 3384 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 3385 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 3386 struct btrfs_space_info *info;
bf5fc093
JB		 3387 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3388 BTRFS_BLOCK_GROUP_SYSTEM,
3389 BTRFS_BLOCK_GROUP_METADATA,
3390 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3391 int num_types = 4;
7fde62bf 3392 int alloc_size;
1406e432 3393 int ret = 0;
51788b1b 3394 u64 slot_count = 0;
bf5fc093 3395 int i, c;
1406e432
JB		 3396
3397 if (copy_from_user(&space_args,
3398 (struct btrfs_ioctl_space_args __user *)arg,
3399 sizeof(space_args)))
3400 return -EFAULT;
3401
bf5fc093
JB		 3402 for (i = 0; i < num_types; i++) {
3403 struct btrfs_space_info *tmp;
3404
3405 info = NULL;
3406 rcu_read_lock();
3407 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3408 list) {
3409 if (tmp->flags == types[i]) {
3410 info = tmp;
3411 break;
3412 }
3413 }
3414 rcu_read_unlock();
3415
3416 if (!info)
3417 continue;
3418
3419 down_read(&info->groups_sem);
3420 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3421 if (!list_empty(&info->block_groups[c]))
3422 slot_count++;
3423 }
3424 up_read(&info->groups_sem);
3425 }
7fde62bf
CM		 3426
3427 /* space_slots == 0 means they are asking for a count */
3428 if (space_args.space_slots == 0) {
3429 space_args.total_spaces = slot_count;
3430 goto out;
3431 }
bf5fc093 3432
51788b1b 3433 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 3434
7fde62bf 3435 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 3436
7fde62bf
CM		 3437 /* we generally have at most 6 or so space infos, one for each raid
3438 * level. So, a whole page should be more than enough for everyone
3439 */
3440 if (alloc_size > PAGE_CACHE_SIZE)
3441 return -ENOMEM;
3442
1406e432 3443 space_args.total_spaces = 0;
7fde62bf
CM		 3444 dest = kmalloc(alloc_size, GFP_NOFS);
3445 if (!dest)
3446 return -ENOMEM;
3447 dest_orig = dest;
1406e432 3448
7fde62bf 3449 /* now we have a buffer to copy into */
bf5fc093
JB		 3450 for (i = 0; i < num_types; i++) {
3451 struct btrfs_space_info *tmp;
3452
51788b1b
DR		 3453 if (!slot_count)
3454 break;
3455
bf5fc093
JB		 3456 info = NULL;
3457 rcu_read_lock();
3458 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
3459 list) {
3460 if (tmp->flags == types[i]) {
3461 info = tmp;
3462 break;
3463 }
3464 }
3465 rcu_read_unlock();
7fde62bf 3466
bf5fc093
JB		 3467 if (!info)
3468 continue;
3469 down_read(&info->groups_sem);
3470 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3471 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 3472 btrfs_get_block_group_info(
3473 &info->block_groups[c], &space);
bf5fc093
JB		 3474 memcpy(dest, &space, sizeof(space));
3475 dest++;
3476 space_args.total_spaces++;
51788b1b 3477 slot_count--;
bf5fc093 3478 }
51788b1b
DR		 3479 if (!slot_count)
3480 break;
bf5fc093
JB		 3481 }
3482 up_read(&info->groups_sem);
1406e432 3483 }
1406e432 3484
2eec6c81 3485 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3486 (arg + sizeof(struct btrfs_ioctl_space_args));
3487
3488 if (copy_to_user(user_dest, dest_orig, alloc_size))
3489 ret = -EFAULT;
3490
3491 kfree(dest_orig);
3492out:
3493 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3494 ret = -EFAULT;
3495
3496 return ret;
3497}
3498
f46b5a66
CH		 3499/*
3500 * there are many ways the trans_start and trans_end ioctls can lead
3501 * to deadlocks. They should only be used by applications that
3502 * basically own the machine, and have a very in depth understanding
3503 * of all the possible deadlocks and enospc problems.
3504 */
3505long btrfs_ioctl_trans_end(struct file *file)
3506{
496ad9aa 3507 struct inode *inode = file_inode(file);
f46b5a66
CH		 3508 struct btrfs_root *root = BTRFS_I(inode)->root;
3509 struct btrfs_trans_handle *trans;
f46b5a66 3510
f46b5a66 3511 trans = file->private_data;
1ab86aed
SW		 3512 if (!trans)
3513 return -EINVAL;
b214107e 3514 file->private_data = NULL;
9ca9ee09 3515
1ab86aed
SW		 3516 btrfs_end_transaction(trans, root);
3517
a4abeea4 3518 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3519
2a79f17e 3520 mnt_drop_write_file(file);
1ab86aed 3521 return 0;
f46b5a66
CH		 3522}
3523
9a8c28be
MX		 3524static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3525 void __user *argp)
46204592 3526{
46204592
SW		 3527 struct btrfs_trans_handle *trans;
3528 u64 transid;
db5b493a 3529 int ret;
46204592 3530
d4edf39b 3531 trans = btrfs_attach_transaction_barrier(root);
ff7c1d33
MX		 3532 if (IS_ERR(trans)) {
3533 if (PTR_ERR(trans) != -ENOENT)
3534 return PTR_ERR(trans);
3535
3536 /* No running transaction, don't bother */
3537 transid = root->fs_info->last_trans_committed;
3538 goto out;
3539 }
46204592 3540 transid = trans->transid;
db5b493a 3541 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3542 if (ret) {
3543 btrfs_end_transaction(trans, root);
db5b493a 3544 return ret;
8b2b2d3c 3545 }
ff7c1d33 3546out:
46204592
SW		 3547 if (argp)
3548 if (copy_to_user(argp, &transid, sizeof(transid)))
3549 return -EFAULT;
3550 return 0;
3551}
3552
9a8c28be
MX		 3553static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
3554 void __user *argp)
46204592 3555{
46204592
SW		 3556 u64 transid;
3557
3558 if (argp) {
3559 if (copy_from_user(&transid, argp, sizeof(transid)))
3560 return -EFAULT;
3561 } else {
3562 transid = 0; /* current trans */
3563 }
3564 return btrfs_wait_for_commit(root, transid);
3565}
3566
b8e95489 3567static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
475f6387 3568{
496ad9aa 3569 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
475f6387 3570 struct btrfs_ioctl_scrub_args *sa;
b8e95489 3571 int ret;
475f6387
JS		 3572
3573 if (!capable(CAP_SYS_ADMIN))
3574 return -EPERM;
3575
3576 sa = memdup_user(arg, sizeof(*sa));
3577 if (IS_ERR(sa))
3578 return PTR_ERR(sa);
3579
b8e95489
MX		 3580 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3581 ret = mnt_want_write_file(file);
3582 if (ret)
3583 goto out;
3584 }
3585
aa1b8cd4 3586 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
63a212ab
SB		 3587 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3588 0);
475f6387
JS		 3589
3590 if (copy_to_user(arg, sa, sizeof(*sa)))
3591 ret = -EFAULT;
3592
b8e95489
MX		 3593 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3594 mnt_drop_write_file(file);
3595out:
475f6387
JS		 3596 kfree(sa);
3597 return ret;
3598}
3599
3600static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3601{
3602 if (!capable(CAP_SYS_ADMIN))
3603 return -EPERM;
3604
aa1b8cd4 3605 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3606}
3607
3608static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3609 void __user *arg)
3610{
3611 struct btrfs_ioctl_scrub_args *sa;
3612 int ret;
3613
3614 if (!capable(CAP_SYS_ADMIN))
3615 return -EPERM;
3616
3617 sa = memdup_user(arg, sizeof(*sa));
3618 if (IS_ERR(sa))
3619 return PTR_ERR(sa);
3620
3621 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3622
3623 if (copy_to_user(arg, sa, sizeof(*sa)))
3624 ret = -EFAULT;
3625
3626 kfree(sa);
3627 return ret;
3628}
3629
c11d2c23 3630static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3631 void __user *arg)
c11d2c23
SB		 3632{
3633 struct btrfs_ioctl_get_dev_stats *sa;
3634 int ret;
3635
c11d2c23
SB		 3636 sa = memdup_user(arg, sizeof(*sa));
3637 if (IS_ERR(sa))
3638 return PTR_ERR(sa);
3639
b27f7c0c
DS		 3640 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3641 kfree(sa);
3642 return -EPERM;
3643 }
3644
3645 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3646
3647 if (copy_to_user(arg, sa, sizeof(*sa)))
3648 ret = -EFAULT;
3649
3650 kfree(sa);
3651 return ret;
3652}
3653
3f6bcfbd
SB		 3654static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
3655{
3656 struct btrfs_ioctl_dev_replace_args *p;
3657 int ret;
3658
3659 if (!capable(CAP_SYS_ADMIN))
3660 return -EPERM;
3661
3662 p = memdup_user(arg, sizeof(*p));
3663 if (IS_ERR(p))
3664 return PTR_ERR(p);
3665
3666 switch (p->cmd) {
3667 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
bbb651e4
SB		 3668 if (root->fs_info->sb->s_flags & MS_RDONLY)
3669 return -EROFS;
3670
3f6bcfbd
SB		 3671 if (atomic_xchg(
3672 &root->fs_info->mutually_exclusive_operation_running,
3673 1)) {
e57138b3 3674 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3f6bcfbd
SB		 3675 } else {
3676 ret = btrfs_dev_replace_start(root, p);
3677 atomic_set(
3678 &root->fs_info->mutually_exclusive_operation_running,
3679 0);
3680 }
3681 break;
3682 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3683 btrfs_dev_replace_status(root->fs_info, p);
3684 ret = 0;
3685 break;
3686 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3687 ret = btrfs_dev_replace_cancel(root->fs_info, p);
3688 break;
3689 default:
3690 ret = -EINVAL;
3691 break;
3692 }
3693
3694 if (copy_to_user(arg, p, sizeof(*p)))
3695 ret = -EFAULT;
3696
3697 kfree(p);
3698 return ret;
3699}
3700
d7728c96
JS		 3701static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3702{
3703 int ret = 0;
3704 int i;
740c3d22 3705 u64 rel_ptr;
d7728c96 3706 int size;
806468f8 3707 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3708 struct inode_fs_paths *ipath = NULL;
3709 struct btrfs_path *path;
3710
82b22ac8 3711 if (!capable(CAP_DAC_READ_SEARCH))
d7728c96
JS		 3712 return -EPERM;
3713
3714 path = btrfs_alloc_path();
3715 if (!path) {
3716 ret = -ENOMEM;
3717 goto out;
3718 }
3719
3720 ipa = memdup_user(arg, sizeof(*ipa));
3721 if (IS_ERR(ipa)) {
3722 ret = PTR_ERR(ipa);
3723 ipa = NULL;
3724 goto out;
3725 }
3726
3727 size = min_t(u32, ipa->size, 4096);
3728 ipath = init_ipath(size, root, path);
3729 if (IS_ERR(ipath)) {
3730 ret = PTR_ERR(ipath);
3731 ipath = NULL;
3732 goto out;
3733 }
3734
3735 ret = paths_from_inode(ipa->inum, ipath);
3736 if (ret < 0)
3737 goto out;
3738
3739 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3740 rel_ptr = ipath->fspath->val[i] -
3741 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3742 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3743 }
3744
745c4d8e
JM		 3745 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3746 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3747 if (ret) {
3748 ret = -EFAULT;
3749 goto out;
3750 }
3751
3752out:
3753 btrfs_free_path(path);
3754 free_ipath(ipath);
3755 kfree(ipa);
3756
3757 return ret;
3758}
3759
3760static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3761{
3762 struct btrfs_data_container *inodes = ctx;
3763 const size_t c = 3 * sizeof(u64);
3764
3765 if (inodes->bytes_left >= c) {
3766 inodes->bytes_left -= c;
3767 inodes->val[inodes->elem_cnt] = inum;
3768 inodes->val[inodes->elem_cnt + 1] = offset;
3769 inodes->val[inodes->elem_cnt + 2] = root;
3770 inodes->elem_cnt += 3;
3771 } else {
3772 inodes->bytes_missing += c - inodes->bytes_left;
3773 inodes->bytes_left = 0;
3774 inodes->elem_missed += 3;
3775 }
3776
3777 return 0;
3778}
3779
3780static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3781 void __user *arg)
3782{
3783 int ret = 0;
3784 int size;
d7728c96
JS		 3785 struct btrfs_ioctl_logical_ino_args *loi;
3786 struct btrfs_data_container *inodes = NULL;
3787 struct btrfs_path *path = NULL;
d7728c96
JS		 3788
3789 if (!capable(CAP_SYS_ADMIN))
3790 return -EPERM;
3791
3792 loi = memdup_user(arg, sizeof(*loi));
3793 if (IS_ERR(loi)) {
3794 ret = PTR_ERR(loi);
3795 loi = NULL;
3796 goto out;
3797 }
3798
3799 path = btrfs_alloc_path();
3800 if (!path) {
3801 ret = -ENOMEM;
3802 goto out;
3803 }
3804
425d17a2 3805 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3806 inodes = init_data_container(size);
3807 if (IS_ERR(inodes)) {
3808 ret = PTR_ERR(inodes);
3809 inodes = NULL;
3810 goto out;
3811 }
3812
df031f07
LB		 3813 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3814 build_ino_list, inodes);
3815 if (ret == -EINVAL)
d7728c96
JS		 3816 ret = -ENOENT;
3817 if (ret < 0)
3818 goto out;
3819
745c4d8e
JM		 3820 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3821 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3822 if (ret)
3823 ret = -EFAULT;
3824
3825out:
3826 btrfs_free_path(path);
425d17a2 3827 vfree(inodes);
d7728c96
JS		 3828 kfree(loi);
3829
3830 return ret;
3831}
3832
19a39dce 3833void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3834 struct btrfs_ioctl_balance_args *bargs)
3835{
3836 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3837
3838 bargs->flags = bctl->flags;
3839
837d5b6e
ID		 3840 if (atomic_read(&fs_info->balance_running))
3841 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3842 if (atomic_read(&fs_info->balance_pause_req))
3843 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3844 if (atomic_read(&fs_info->balance_cancel_req))
3845 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3846
c9e9f97b
ID		 3847 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3848 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3849 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3850
3851 if (lock) {
3852 spin_lock(&fs_info->balance_lock);
3853 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3854 spin_unlock(&fs_info->balance_lock);
3855 } else {
3856 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3857 }
c9e9f97b
ID		 3858}
3859
9ba1f6e4 3860static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 3861{
496ad9aa 3862 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
c9e9f97b
ID		 3863 struct btrfs_fs_info *fs_info = root->fs_info;
3864 struct btrfs_ioctl_balance_args *bargs;
3865 struct btrfs_balance_control *bctl;
ed0fb78f 3866 bool need_unlock; /* for mut. excl. ops lock */
c9e9f97b
ID		 3867 int ret;
3868
3869 if (!capable(CAP_SYS_ADMIN))
3870 return -EPERM;
3871
e54bfa31 3872 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 3873 if (ret)
3874 return ret;
3875
ed0fb78f
ID		 3876again:
3877 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
3878 mutex_lock(&fs_info->volume_mutex);
3879 mutex_lock(&fs_info->balance_mutex);
3880 need_unlock = true;
3881 goto locked;
3882 }
3883
3884 /*
3885 * mut. excl. ops lock is locked. Three possibilites:
3886 * (1) some other op is running
3887 * (2) balance is running
3888 * (3) balance is paused -- special case (think resume)
3889 */
c9e9f97b 3890 mutex_lock(&fs_info->balance_mutex);
ed0fb78f
ID		 3891 if (fs_info->balance_ctl) {
3892 /* this is either (2) or (3) */
3893 if (!atomic_read(&fs_info->balance_running)) {
3894 mutex_unlock(&fs_info->balance_mutex);
3895 if (!mutex_trylock(&fs_info->volume_mutex))
3896 goto again;
3897 mutex_lock(&fs_info->balance_mutex);
3898
3899 if (fs_info->balance_ctl &&
3900 !atomic_read(&fs_info->balance_running)) {
3901 /* this is (3) */
3902 need_unlock = false;
3903 goto locked;
3904 }
3905
3906 mutex_unlock(&fs_info->balance_mutex);
3907 mutex_unlock(&fs_info->volume_mutex);
3908 goto again;
3909 } else {
3910 /* this is (2) */
3911 mutex_unlock(&fs_info->balance_mutex);
3912 ret = -EINPROGRESS;
3913 goto out;
3914 }
3915 } else {
3916 /* this is (1) */
3917 mutex_unlock(&fs_info->balance_mutex);
e57138b3 3918 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
ed0fb78f
ID		 3919 goto out;
3920 }
3921
3922locked:
3923 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
c9e9f97b
ID		 3924
3925 if (arg) {
3926 bargs = memdup_user(arg, sizeof(*bargs));
3927 if (IS_ERR(bargs)) {
3928 ret = PTR_ERR(bargs);
ed0fb78f 3929 goto out_unlock;
c9e9f97b 3930 }
de322263
ID		 3931
3932 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3933 if (!fs_info->balance_ctl) {
3934 ret = -ENOTCONN;
3935 goto out_bargs;
3936 }
3937
3938 bctl = fs_info->balance_ctl;
3939 spin_lock(&fs_info->balance_lock);
3940 bctl->flags |= BTRFS_BALANCE_RESUME;
3941 spin_unlock(&fs_info->balance_lock);
3942
3943 goto do_balance;
3944 }
c9e9f97b
ID		 3945 } else {
3946 bargs = NULL;
3947 }
3948
ed0fb78f 3949 if (fs_info->balance_ctl) {
837d5b6e
ID		 3950 ret = -EINPROGRESS;
3951 goto out_bargs;
3952 }
3953
c9e9f97b
ID		 3954 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3955 if (!bctl) {
3956 ret = -ENOMEM;
3957 goto out_bargs;
3958 }
3959
3960 bctl->fs_info = fs_info;
3961 if (arg) {
3962 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3963 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3964 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3965
3966 bctl->flags = bargs->flags;
f43ffb60
ID		 3967 } else {
3968 /* balance everything - no filters */
3969 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 3970 }
3971
de322263 3972do_balance:
c9e9f97b 3973 /*
ed0fb78f
ID		 3974 * Ownership of bctl and mutually_exclusive_operation_running
3975 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
3976 * or, if restriper was paused all the way until unmount, in
3977 * free_fs_info. mutually_exclusive_operation_running is
3978 * cleared in __cancel_balance.
c9e9f97b 3979 */
ed0fb78f
ID		 3980 need_unlock = false;
3981
3982 ret = btrfs_balance(bctl, bargs);
3983
c9e9f97b
ID		 3984 if (arg) {
3985 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3986 ret = -EFAULT;
3987 }
3988
3989out_bargs:
3990 kfree(bargs);
ed0fb78f 3991out_unlock:
c9e9f97b
ID		 3992 mutex_unlock(&fs_info->balance_mutex);
3993 mutex_unlock(&fs_info->volume_mutex);
ed0fb78f
ID		 3994 if (need_unlock)
3995 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
3996out:
e54bfa31 3997 mnt_drop_write_file(file);
c9e9f97b
ID		 3998 return ret;
3999}
4000
837d5b6e
ID		 4001static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4002{
4003 if (!capable(CAP_SYS_ADMIN))
4004 return -EPERM;
4005
4006 switch (cmd) {
4007 case BTRFS_BALANCE_CTL_PAUSE:
4008 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 4009 case BTRFS_BALANCE_CTL_CANCEL:
4010 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 4011 }
4012
4013 return -EINVAL;
4014}
4015
19a39dce
ID		 4016static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4017 void __user *arg)
4018{
4019 struct btrfs_fs_info *fs_info = root->fs_info;
4020 struct btrfs_ioctl_balance_args *bargs;
4021 int ret = 0;
4022
4023 if (!capable(CAP_SYS_ADMIN))
4024 return -EPERM;
4025
4026 mutex_lock(&fs_info->balance_mutex);
4027 if (!fs_info->balance_ctl) {
4028 ret = -ENOTCONN;
4029 goto out;
4030 }
4031
4032 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
4033 if (!bargs) {
4034 ret = -ENOMEM;
4035 goto out;
4036 }
4037
4038 update_ioctl_balance_args(fs_info, 1, bargs);
4039
4040 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4041 ret = -EFAULT;
4042
4043 kfree(bargs);
4044out:
4045 mutex_unlock(&fs_info->balance_mutex);
4046 return ret;
4047}
4048
905b0dda 4049static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
5d13a37b 4050{
496ad9aa 4051 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4052 struct btrfs_ioctl_quota_ctl_args *sa;
4053 struct btrfs_trans_handle *trans = NULL;
4054 int ret;
4055 int err;
4056
4057 if (!capable(CAP_SYS_ADMIN))
4058 return -EPERM;
4059
905b0dda
MX		 4060 ret = mnt_want_write_file(file);
4061 if (ret)
4062 return ret;
5d13a37b
AJ		 4063
4064 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4065 if (IS_ERR(sa)) {
4066 ret = PTR_ERR(sa);
4067 goto drop_write;
4068 }
5d13a37b 4069
7708f029 4070 down_write(&root->fs_info->subvol_sem);
2f232036
JS		 4071 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4072 if (IS_ERR(trans)) {
4073 ret = PTR_ERR(trans);
4074 goto out;
5d13a37b
AJ		 4075 }
4076
4077 switch (sa->cmd) {
4078 case BTRFS_QUOTA_CTL_ENABLE:
4079 ret = btrfs_quota_enable(trans, root->fs_info);
4080 break;
4081 case BTRFS_QUOTA_CTL_DISABLE:
4082 ret = btrfs_quota_disable(trans, root->fs_info);
4083 break;
5d13a37b
AJ		 4084 default:
4085 ret = -EINVAL;
4086 break;
4087 }
4088
2f232036
JS		 4089 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4090 if (err && !ret)
4091 ret = err;
5d13a37b
AJ		 4092out:
4093 kfree(sa);
7708f029 4094 up_write(&root->fs_info->subvol_sem);
905b0dda
MX		 4095drop_write:
4096 mnt_drop_write_file(file);
5d13a37b
AJ		 4097 return ret;
4098}
4099
905b0dda 4100static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
5d13a37b 4101{
496ad9aa 4102 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4103 struct btrfs_ioctl_qgroup_assign_args *sa;
4104 struct btrfs_trans_handle *trans;
4105 int ret;
4106 int err;
4107
4108 if (!capable(CAP_SYS_ADMIN))
4109 return -EPERM;
4110
905b0dda
MX		 4111 ret = mnt_want_write_file(file);
4112 if (ret)
4113 return ret;
5d13a37b
AJ		 4114
4115 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4116 if (IS_ERR(sa)) {
4117 ret = PTR_ERR(sa);
4118 goto drop_write;
4119 }
5d13a37b
AJ		 4120
4121 trans = btrfs_join_transaction(root);
4122 if (IS_ERR(trans)) {
4123 ret = PTR_ERR(trans);
4124 goto out;
4125 }
4126
4127 /* FIXME: check if the IDs really exist */
4128 if (sa->assign) {
4129 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4130 sa->src, sa->dst);
4131 } else {
4132 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4133 sa->src, sa->dst);
4134 }
4135
4136 err = btrfs_end_transaction(trans, root);
4137 if (err && !ret)
4138 ret = err;
4139
4140out:
4141 kfree(sa);
905b0dda
MX		 4142drop_write:
4143 mnt_drop_write_file(file);
5d13a37b
AJ		 4144 return ret;
4145}
4146
905b0dda 4147static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
5d13a37b 4148{
496ad9aa 4149 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4150 struct btrfs_ioctl_qgroup_create_args *sa;
4151 struct btrfs_trans_handle *trans;
4152 int ret;
4153 int err;
4154
4155 if (!capable(CAP_SYS_ADMIN))
4156 return -EPERM;
4157
905b0dda
MX		 4158 ret = mnt_want_write_file(file);
4159 if (ret)
4160 return ret;
5d13a37b
AJ		 4161
4162 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4163 if (IS_ERR(sa)) {
4164 ret = PTR_ERR(sa);
4165 goto drop_write;
4166 }
5d13a37b 4167
d86e56cf
MX		 4168 if (!sa->qgroupid) {
4169 ret = -EINVAL;
4170 goto out;
4171 }
4172
5d13a37b
AJ		 4173 trans = btrfs_join_transaction(root);
4174 if (IS_ERR(trans)) {
4175 ret = PTR_ERR(trans);
4176 goto out;
4177 }
4178
4179 /* FIXME: check if the IDs really exist */
4180 if (sa->create) {
4181 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
4182 NULL);
4183 } else {
4184 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4185 }
4186
4187 err = btrfs_end_transaction(trans, root);
4188 if (err && !ret)
4189 ret = err;
4190
4191out:
4192 kfree(sa);
905b0dda
MX		 4193drop_write:
4194 mnt_drop_write_file(file);
5d13a37b
AJ		 4195 return ret;
4196}
4197
905b0dda 4198static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
5d13a37b 4199{
496ad9aa 4200 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5d13a37b
AJ		 4201 struct btrfs_ioctl_qgroup_limit_args *sa;
4202 struct btrfs_trans_handle *trans;
4203 int ret;
4204 int err;
4205 u64 qgroupid;
4206
4207 if (!capable(CAP_SYS_ADMIN))
4208 return -EPERM;
4209
905b0dda
MX		 4210 ret = mnt_want_write_file(file);
4211 if (ret)
4212 return ret;
5d13a37b
AJ		 4213
4214 sa = memdup_user(arg, sizeof(*sa));
905b0dda
MX		 4215 if (IS_ERR(sa)) {
4216 ret = PTR_ERR(sa);
4217 goto drop_write;
4218 }
5d13a37b
AJ		 4219
4220 trans = btrfs_join_transaction(root);
4221 if (IS_ERR(trans)) {
4222 ret = PTR_ERR(trans);
4223 goto out;
4224 }
4225
4226 qgroupid = sa->qgroupid;
4227 if (!qgroupid) {
4228 /* take the current subvol as qgroup */
4229 qgroupid = root->root_key.objectid;
4230 }
4231
4232 /* FIXME: check if the IDs really exist */
4233 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4234
4235 err = btrfs_end_transaction(trans, root);
4236 if (err && !ret)
4237 ret = err;
4238
4239out:
4240 kfree(sa);
905b0dda
MX		 4241drop_write:
4242 mnt_drop_write_file(file);
5d13a37b
AJ		 4243 return ret;
4244}
4245
2f232036
JS		 4246static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4247{
6d0379ec 4248 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4249 struct btrfs_ioctl_quota_rescan_args *qsa;
4250 int ret;
4251
4252 if (!capable(CAP_SYS_ADMIN))
4253 return -EPERM;
4254
4255 ret = mnt_want_write_file(file);
4256 if (ret)
4257 return ret;
4258
4259 qsa = memdup_user(arg, sizeof(*qsa));
4260 if (IS_ERR(qsa)) {
4261 ret = PTR_ERR(qsa);
4262 goto drop_write;
4263 }
4264
4265 if (qsa->flags) {
4266 ret = -EINVAL;
4267 goto out;
4268 }
4269
4270 ret = btrfs_qgroup_rescan(root->fs_info);
4271
4272out:
4273 kfree(qsa);
4274drop_write:
4275 mnt_drop_write_file(file);
4276 return ret;
4277}
4278
4279static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4280{
6d0379ec 4281 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2f232036
JS		 4282 struct btrfs_ioctl_quota_rescan_args *qsa;
4283 int ret = 0;
4284
4285 if (!capable(CAP_SYS_ADMIN))
4286 return -EPERM;
4287
4288 qsa = kzalloc(sizeof(*qsa), GFP_NOFS);
4289 if (!qsa)
4290 return -ENOMEM;
4291
4292 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4293 qsa->flags = 1;
4294 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
4295 }
4296
4297 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4298 ret = -EFAULT;
4299
4300 kfree(qsa);
4301 return ret;
4302}
4303
57254b6e
JS		 4304static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
4305{
4306 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
4307
4308 if (!capable(CAP_SYS_ADMIN))
4309 return -EPERM;
4310
4311 return btrfs_qgroup_wait_for_completion(root->fs_info);
4312}
4313
8ea05e3a
AB		 4314static long btrfs_ioctl_set_received_subvol(struct file *file,
4315 void __user *arg)
4316{
4317 struct btrfs_ioctl_received_subvol_args *sa = NULL;
496ad9aa 4318 struct inode *inode = file_inode(file);
8ea05e3a
AB		 4319 struct btrfs_root *root = BTRFS_I(inode)->root;
4320 struct btrfs_root_item *root_item = &root->root_item;
4321 struct btrfs_trans_handle *trans;
4322 struct timespec ct = CURRENT_TIME;
4323 int ret = 0;
dd5f9615 4324 int received_uuid_changed;
8ea05e3a
AB		 4325
4326 ret = mnt_want_write_file(file);
4327 if (ret < 0)
4328 return ret;
4329
4330 down_write(&root->fs_info->subvol_sem);
4331
4332 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
4333 ret = -EINVAL;
4334 goto out;
4335 }
4336
4337 if (btrfs_root_readonly(root)) {
4338 ret = -EROFS;
4339 goto out;
4340 }
4341
4342 if (!inode_owner_or_capable(inode)) {
4343 ret = -EACCES;
4344 goto out;
4345 }
4346
4347 sa = memdup_user(arg, sizeof(*sa));
4348 if (IS_ERR(sa)) {
4349 ret = PTR_ERR(sa);
4350 sa = NULL;
4351 goto out;
4352 }
4353
dd5f9615
SB		 4354 /*
4355 * 1 - root item
4356 * 2 - uuid items (received uuid + subvol uuid)
4357 */
4358 trans = btrfs_start_transaction(root, 3);
8ea05e3a
AB		 4359 if (IS_ERR(trans)) {
4360 ret = PTR_ERR(trans);
4361 trans = NULL;
4362 goto out;
4363 }
4364
4365 sa->rtransid = trans->transid;
4366 sa->rtime.sec = ct.tv_sec;
4367 sa->rtime.nsec = ct.tv_nsec;
4368
dd5f9615
SB		 4369 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4370 BTRFS_UUID_SIZE);
4371 if (received_uuid_changed &&
4372 !btrfs_is_empty_uuid(root_item->received_uuid))
4373 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
4374 root_item->received_uuid,
4375 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4376 root->root_key.objectid);
8ea05e3a
AB		 4377 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
4378 btrfs_set_root_stransid(root_item, sa->stransid);
4379 btrfs_set_root_rtransid(root_item, sa->rtransid);
3cae210f
QW		 4380 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
4381 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
4382 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
4383 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
8ea05e3a
AB		 4384
4385 ret = btrfs_update_root(trans, root->fs_info->tree_root,
4386 &root->root_key, &root->root_item);
4387 if (ret < 0) {
4388 btrfs_end_transaction(trans, root);
8ea05e3a 4389 goto out;
dd5f9615
SB		 4390 }
4391 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
4392 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
4393 sa->uuid,
4394 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4395 root->root_key.objectid);
4396 if (ret < 0 && ret != -EEXIST) {
4397 btrfs_abort_transaction(trans, root, ret);
8ea05e3a 4398 goto out;
dd5f9615
SB		 4399 }
4400 }
4401 ret = btrfs_commit_transaction(trans, root);
4402 if (ret < 0) {
4403 btrfs_abort_transaction(trans, root, ret);
4404 goto out;
8ea05e3a
AB		 4405 }
4406
4407 ret = copy_to_user(arg, sa, sizeof(*sa));
4408 if (ret)
4409 ret = -EFAULT;
4410
4411out:
4412 kfree(sa);
4413 up_write(&root->fs_info->subvol_sem);
4414 mnt_drop_write_file(file);
4415 return ret;
4416}
4417
867ab667 4418static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
4419{
6d0379ec 4420 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a1b83ac5 4421 size_t len;
867ab667 4422 int ret;
a1b83ac5
AJ		 4423 char label[BTRFS_LABEL_SIZE];
4424
4425 spin_lock(&root->fs_info->super_lock);
4426 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
4427 spin_unlock(&root->fs_info->super_lock);
4428
4429 len = strnlen(label, BTRFS_LABEL_SIZE);
867ab667 4430
4431 if (len == BTRFS_LABEL_SIZE) {
4432 pr_warn("btrfs: label is too long, return the first %zu bytes\n",
4433 --len);
4434 }
4435
867ab667 4436 ret = copy_to_user(arg, label, len);
867ab667 4437
4438 return ret ? -EFAULT : 0;
4439}
4440
a8bfd4ab 4441static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
4442{
6d0379ec 4443 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
a8bfd4ab 4444 struct btrfs_super_block *super_block = root->fs_info->super_copy;
4445 struct btrfs_trans_handle *trans;
4446 char label[BTRFS_LABEL_SIZE];
4447 int ret;
4448
4449 if (!capable(CAP_SYS_ADMIN))
4450 return -EPERM;
4451
4452 if (copy_from_user(label, arg, sizeof(label)))
4453 return -EFAULT;
4454
4455 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
4456 pr_err("btrfs: unable to set label with more than %d bytes\n",
4457 BTRFS_LABEL_SIZE - 1);
4458 return -EINVAL;
4459 }
4460
4461 ret = mnt_want_write_file(file);
4462 if (ret)
4463 return ret;
4464
a8bfd4ab 4465 trans = btrfs_start_transaction(root, 0);
4466 if (IS_ERR(trans)) {
4467 ret = PTR_ERR(trans);
4468 goto out_unlock;
4469 }
4470
a1b83ac5 4471 spin_lock(&root->fs_info->super_lock);
a8bfd4ab 4472 strcpy(super_block->label, label);
a1b83ac5 4473 spin_unlock(&root->fs_info->super_lock);
a8bfd4ab 4474 ret = btrfs_end_transaction(trans, root);
4475
4476out_unlock:
a8bfd4ab 4477 mnt_drop_write_file(file);
4478 return ret;
4479}
4480
f46b5a66
CH		 4481long btrfs_ioctl(struct file *file, unsigned int
4482 cmd, unsigned long arg)
4483{
496ad9aa 4484 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4bcabaa3 4485 void __user *argp = (void __user *)arg;
f46b5a66
CH		 4486
4487 switch (cmd) {
6cbff00f
CH		 4488 case FS_IOC_GETFLAGS:
4489 return btrfs_ioctl_getflags(file, argp);
4490 case FS_IOC_SETFLAGS:
4491 return btrfs_ioctl_setflags(file, argp);
4492 case FS_IOC_GETVERSION:
4493 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 4494 case FITRIM:
4495 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 4496 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 4497 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 4498 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 4499 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 4500 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 4501 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 4502 case BTRFS_IOC_SUBVOL_CREATE_V2:
4503 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 4504 case BTRFS_IOC_SNAP_DESTROY:
4505 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 4506 case BTRFS_IOC_SUBVOL_GETFLAGS:
4507 return btrfs_ioctl_subvol_getflags(file, argp);
4508 case BTRFS_IOC_SUBVOL_SETFLAGS:
4509 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 4510 case BTRFS_IOC_DEFAULT_SUBVOL:
4511 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 4512 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 4513 return btrfs_ioctl_defrag(file, NULL);
4514 case BTRFS_IOC_DEFRAG_RANGE:
4515 return btrfs_ioctl_defrag(file, argp);
f46b5a66 4516 case BTRFS_IOC_RESIZE:
198605a8 4517 return btrfs_ioctl_resize(file, argp);
f46b5a66 4518 case BTRFS_IOC_ADD_DEV:
4bcabaa3 4519 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 4520 case BTRFS_IOC_RM_DEV:
da24927b 4521 return btrfs_ioctl_rm_dev(file, argp);
475f6387
JS		 4522 case BTRFS_IOC_FS_INFO:
4523 return btrfs_ioctl_fs_info(root, argp);
4524 case BTRFS_IOC_DEV_INFO:
4525 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 4526 case BTRFS_IOC_BALANCE:
9ba1f6e4 4527 return btrfs_ioctl_balance(file, NULL);
f46b5a66 4528 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 4529 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
4530 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 4531 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 4532 case BTRFS_IOC_TRANS_START:
4533 return btrfs_ioctl_trans_start(file);
4534 case BTRFS_IOC_TRANS_END:
4535 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 4536 case BTRFS_IOC_TREE_SEARCH:
4537 return btrfs_ioctl_tree_search(file, argp);
4538 case BTRFS_IOC_INO_LOOKUP:
4539 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 4540 case BTRFS_IOC_INO_PATHS:
4541 return btrfs_ioctl_ino_to_path(root, argp);
4542 case BTRFS_IOC_LOGICAL_INO:
4543 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 4544 case BTRFS_IOC_SPACE_INFO:
4545 return btrfs_ioctl_space_info(root, argp);
f46b5a66
CH		 4546 case BTRFS_IOC_SYNC:
4547 btrfs_sync_fs(file->f_dentry->d_sb, 1);
4548 return 0;
46204592 4549 case BTRFS_IOC_START_SYNC:
9a8c28be 4550 return btrfs_ioctl_start_sync(root, argp);
46204592 4551 case BTRFS_IOC_WAIT_SYNC:
9a8c28be 4552 return btrfs_ioctl_wait_sync(root, argp);
475f6387 4553 case BTRFS_IOC_SCRUB:
b8e95489 4554 return btrfs_ioctl_scrub(file, argp);
475f6387
JS		 4555 case BTRFS_IOC_SCRUB_CANCEL:
4556 return btrfs_ioctl_scrub_cancel(root, argp);
4557 case BTRFS_IOC_SCRUB_PROGRESS:
4558 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 4559 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 4560 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 4561 case BTRFS_IOC_BALANCE_CTL:
4562 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 4563 case BTRFS_IOC_BALANCE_PROGRESS:
4564 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 4565 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
4566 return btrfs_ioctl_set_received_subvol(file, argp);
31db9f7c
AB		 4567 case BTRFS_IOC_SEND:
4568 return btrfs_ioctl_send(file, argp);
c11d2c23 4569 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 4570 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b 4571 case BTRFS_IOC_QUOTA_CTL:
905b0dda 4572 return btrfs_ioctl_quota_ctl(file, argp);
5d13a37b 4573 case BTRFS_IOC_QGROUP_ASSIGN:
905b0dda 4574 return btrfs_ioctl_qgroup_assign(file, argp);
5d13a37b 4575 case BTRFS_IOC_QGROUP_CREATE:
905b0dda 4576 return btrfs_ioctl_qgroup_create(file, argp);
5d13a37b 4577 case BTRFS_IOC_QGROUP_LIMIT:
905b0dda 4578 return btrfs_ioctl_qgroup_limit(file, argp);
2f232036
JS		 4579 case BTRFS_IOC_QUOTA_RESCAN:
4580 return btrfs_ioctl_quota_rescan(file, argp);
4581 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
4582 return btrfs_ioctl_quota_rescan_status(file, argp);
57254b6e
JS		 4583 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
4584 return btrfs_ioctl_quota_rescan_wait(file, argp);
3f6bcfbd
SB		 4585 case BTRFS_IOC_DEV_REPLACE:
4586 return btrfs_ioctl_dev_replace(root, argp);
867ab667 4587 case BTRFS_IOC_GET_FSLABEL:
4588 return btrfs_ioctl_get_fslabel(file, argp);
a8bfd4ab 4589 case BTRFS_IOC_SET_FSLABEL:
4590 return btrfs_ioctl_set_fslabel(file, argp);
416161db
MF		 4591 case BTRFS_IOC_FILE_EXTENT_SAME:
4592 return btrfs_ioctl_file_extent_same(file, argp);
f46b5a66
CH		 4593 }
4594
4595 return -ENOTTY;
4596}
Michael's Linux tree.