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Btrfs: make ordered extent be flushed by multi-task
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / btrfs / ioctl.c
CommitLineData
f46b5a66
CH		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#include <linux/kernel.h>
20#include <linux/bio.h>
21#include <linux/buffer_head.h>
22#include <linux/file.h>
23#include <linux/fs.h>
cb8e7090 24#include <linux/fsnotify.h>
f46b5a66
CH		 25#include <linux/pagemap.h>
26#include <linux/highmem.h>
27#include <linux/time.h>
28#include <linux/init.h>
29#include <linux/string.h>
f46b5a66 30#include <linux/backing-dev.h>
cb8e7090 31#include <linux/mount.h>
f46b5a66 32#include <linux/mpage.h>
cb8e7090 33#include <linux/namei.h>
f46b5a66
CH		 34#include <linux/swap.h>
35#include <linux/writeback.h>
36#include <linux/statfs.h>
37#include <linux/compat.h>
38#include <linux/bit_spinlock.h>
cb8e7090 39#include <linux/security.h>
f46b5a66 40#include <linux/xattr.h>
7ea394f1 41#include <linux/vmalloc.h>
5a0e3ad6 42#include <linux/slab.h>
f7039b1d 43#include <linux/blkdev.h>
8ea05e3a 44#include <linux/uuid.h>
4b4e25f2 45#include "compat.h"
f46b5a66
CH		 46#include "ctree.h"
47#include "disk-io.h"
48#include "transaction.h"
49#include "btrfs_inode.h"
50#include "ioctl.h"
51#include "print-tree.h"
52#include "volumes.h"
925baedd 53#include "locking.h"
581bb050 54#include "inode-map.h"
d7728c96 55#include "backref.h"
606686ee 56#include "rcu-string.h"
31db9f7c 57#include "send.h"
f46b5a66 58
6cbff00f
CH		 59/* Mask out flags that are inappropriate for the given type of inode. */
60static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
61{
62 if (S_ISDIR(mode))
63 return flags;
64 else if (S_ISREG(mode))
65 return flags & ~FS_DIRSYNC_FL;
66 else
67 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
68}
69
70/*
71 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
72 */
73static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
74{
75 unsigned int iflags = 0;
76
77 if (flags & BTRFS_INODE_SYNC)
78 iflags |= FS_SYNC_FL;
79 if (flags & BTRFS_INODE_IMMUTABLE)
80 iflags |= FS_IMMUTABLE_FL;
81 if (flags & BTRFS_INODE_APPEND)
82 iflags |= FS_APPEND_FL;
83 if (flags & BTRFS_INODE_NODUMP)
84 iflags |= FS_NODUMP_FL;
85 if (flags & BTRFS_INODE_NOATIME)
86 iflags |= FS_NOATIME_FL;
87 if (flags & BTRFS_INODE_DIRSYNC)
88 iflags |= FS_DIRSYNC_FL;
d0092bdd
LZ		 89 if (flags & BTRFS_INODE_NODATACOW)
90 iflags |= FS_NOCOW_FL;
91
92 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
93 iflags |= FS_COMPR_FL;
94 else if (flags & BTRFS_INODE_NOCOMPRESS)
95 iflags |= FS_NOCOMP_FL;
6cbff00f
CH		 96
97 return iflags;
98}
99
100/*
101 * Update inode->i_flags based on the btrfs internal flags.
102 */
103void btrfs_update_iflags(struct inode *inode)
104{
105 struct btrfs_inode *ip = BTRFS_I(inode);
106
107 inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
108
109 if (ip->flags & BTRFS_INODE_SYNC)
110 inode->i_flags |= S_SYNC;
111 if (ip->flags & BTRFS_INODE_IMMUTABLE)
112 inode->i_flags |= S_IMMUTABLE;
113 if (ip->flags & BTRFS_INODE_APPEND)
114 inode->i_flags |= S_APPEND;
115 if (ip->flags & BTRFS_INODE_NOATIME)
116 inode->i_flags |= S_NOATIME;
117 if (ip->flags & BTRFS_INODE_DIRSYNC)
118 inode->i_flags |= S_DIRSYNC;
119}
120
121/*
122 * Inherit flags from the parent inode.
123 *
e27425d6 124 * Currently only the compression flags and the cow flags are inherited.
6cbff00f
CH		 125 */
126void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
127{
0b4dcea5
CM		 128 unsigned int flags;
129
130 if (!dir)
131 return;
132
133 flags = BTRFS_I(dir)->flags;
6cbff00f 134
e27425d6
JB		 135 if (flags & BTRFS_INODE_NOCOMPRESS) {
136 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
137 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
138 } else if (flags & BTRFS_INODE_COMPRESS) {
139 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
140 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
141 }
142
143 if (flags & BTRFS_INODE_NODATACOW)
144 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
6cbff00f 145
6cbff00f
CH		 146 btrfs_update_iflags(inode);
147}
148
149static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
150{
151 struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode);
152 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
153
154 if (copy_to_user(arg, &flags, sizeof(flags)))
155 return -EFAULT;
156 return 0;
157}
158
75e7cb7f
LB		 159static int check_flags(unsigned int flags)
160{
161 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
162 FS_NOATIME_FL | FS_NODUMP_FL | \
163 FS_SYNC_FL | FS_DIRSYNC_FL | \
e1e8fb6a
LZ		 164 FS_NOCOMP_FL | FS_COMPR_FL |
165 FS_NOCOW_FL))
75e7cb7f
LB		 166 return -EOPNOTSUPP;
167
168 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
169 return -EINVAL;
170
75e7cb7f
LB		 171 return 0;
172}
173
6cbff00f
CH		 174static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
175{
176 struct inode *inode = file->f_path.dentry->d_inode;
177 struct btrfs_inode *ip = BTRFS_I(inode);
178 struct btrfs_root *root = ip->root;
179 struct btrfs_trans_handle *trans;
180 unsigned int flags, oldflags;
181 int ret;
f062abf0
LZ		 182 u64 ip_oldflags;
183 unsigned int i_oldflags;
7e97b8da 184 umode_t mode;
6cbff00f 185
b83cc969
LZ		 186 if (btrfs_root_readonly(root))
187 return -EROFS;
188
6cbff00f
CH		 189 if (copy_from_user(&flags, arg, sizeof(flags)))
190 return -EFAULT;
191
75e7cb7f
LB		 192 ret = check_flags(flags);
193 if (ret)
194 return ret;
f46b5a66 195
2e149670 196 if (!inode_owner_or_capable(inode))
6cbff00f
CH		 197 return -EACCES;
198
e7848683
JK		 199 ret = mnt_want_write_file(file);
200 if (ret)
201 return ret;
202
6cbff00f
CH		 203 mutex_lock(&inode->i_mutex);
204
f062abf0
LZ		 205 ip_oldflags = ip->flags;
206 i_oldflags = inode->i_flags;
7e97b8da 207 mode = inode->i_mode;
f062abf0 208
6cbff00f
CH		 209 flags = btrfs_mask_flags(inode->i_mode, flags);
210 oldflags = btrfs_flags_to_ioctl(ip->flags);
211 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
212 if (!capable(CAP_LINUX_IMMUTABLE)) {
213 ret = -EPERM;
214 goto out_unlock;
215 }
216 }
217
6cbff00f
CH		 218 if (flags & FS_SYNC_FL)
219 ip->flags |= BTRFS_INODE_SYNC;
220 else
221 ip->flags &= ~BTRFS_INODE_SYNC;
222 if (flags & FS_IMMUTABLE_FL)
223 ip->flags |= BTRFS_INODE_IMMUTABLE;
224 else
225 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
226 if (flags & FS_APPEND_FL)
227 ip->flags |= BTRFS_INODE_APPEND;
228 else
229 ip->flags &= ~BTRFS_INODE_APPEND;
230 if (flags & FS_NODUMP_FL)
231 ip->flags |= BTRFS_INODE_NODUMP;
232 else
233 ip->flags &= ~BTRFS_INODE_NODUMP;
234 if (flags & FS_NOATIME_FL)
235 ip->flags |= BTRFS_INODE_NOATIME;
236 else
237 ip->flags &= ~BTRFS_INODE_NOATIME;
238 if (flags & FS_DIRSYNC_FL)
239 ip->flags |= BTRFS_INODE_DIRSYNC;
240 else
241 ip->flags &= ~BTRFS_INODE_DIRSYNC;
7e97b8da
DS		 242 if (flags & FS_NOCOW_FL) {
243 if (S_ISREG(mode)) {
244 /*
245 * It's safe to turn csums off here, no extents exist.
246 * Otherwise we want the flag to reflect the real COW
247 * status of the file and will not set it.
248 */
249 if (inode->i_size == 0)
250 ip->flags |= BTRFS_INODE_NODATACOW
251 | BTRFS_INODE_NODATASUM;
252 } else {
253 ip->flags |= BTRFS_INODE_NODATACOW;
254 }
255 } else {
256 /*
257 * Revert back under same assuptions as above
258 */
259 if (S_ISREG(mode)) {
260 if (inode->i_size == 0)
261 ip->flags &= ~(BTRFS_INODE_NODATACOW
262 | BTRFS_INODE_NODATASUM);
263 } else {
264 ip->flags &= ~BTRFS_INODE_NODATACOW;
265 }
266 }
6cbff00f 267
75e7cb7f
LB		 268 /*
269 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
270 * flag may be changed automatically if compression code won't make
271 * things smaller.
272 */
273 if (flags & FS_NOCOMP_FL) {
274 ip->flags &= ~BTRFS_INODE_COMPRESS;
275 ip->flags |= BTRFS_INODE_NOCOMPRESS;
276 } else if (flags & FS_COMPR_FL) {
277 ip->flags |= BTRFS_INODE_COMPRESS;
278 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
ebcb904d
LZ		 279 } else {
280 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
75e7cb7f 281 }
6cbff00f 282
4da6f1a3 283 trans = btrfs_start_transaction(root, 1);
f062abf0
LZ		 284 if (IS_ERR(trans)) {
285 ret = PTR_ERR(trans);
286 goto out_drop;
287 }
6cbff00f 288
306424cc 289 btrfs_update_iflags(inode);
0c4d2d95 290 inode_inc_iversion(inode);
306424cc 291 inode->i_ctime = CURRENT_TIME;
6cbff00f 292 ret = btrfs_update_inode(trans, root, inode);
6cbff00f 293
6cbff00f 294 btrfs_end_transaction(trans, root);
f062abf0
LZ		 295 out_drop:
296 if (ret) {
297 ip->flags = ip_oldflags;
298 inode->i_flags = i_oldflags;
299 }
6cbff00f 300
6cbff00f
CH		 301 out_unlock:
302 mutex_unlock(&inode->i_mutex);
e7848683 303 mnt_drop_write_file(file);
2d4e6f6a 304 return ret;
6cbff00f
CH		 305}
306
307static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
308{
309 struct inode *inode = file->f_path.dentry->d_inode;
310
311 return put_user(inode->i_generation, arg);
312}
f46b5a66 313
f7039b1d
LD		 314static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
315{
815745cf 316 struct btrfs_fs_info *fs_info = btrfs_sb(fdentry(file)->d_sb);
f7039b1d
LD		 317 struct btrfs_device *device;
318 struct request_queue *q;
319 struct fstrim_range range;
320 u64 minlen = ULLONG_MAX;
321 u64 num_devices = 0;
815745cf 322 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
f7039b1d
LD		 323 int ret;
324
325 if (!capable(CAP_SYS_ADMIN))
326 return -EPERM;
327
1f78160c
XG		 328 rcu_read_lock();
329 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
330 dev_list) {
f7039b1d
LD		 331 if (!device->bdev)
332 continue;
333 q = bdev_get_queue(device->bdev);
334 if (blk_queue_discard(q)) {
335 num_devices++;
336 minlen = min((u64)q->limits.discard_granularity,
337 minlen);
338 }
339 }
1f78160c 340 rcu_read_unlock();
f4c697e6 341
f7039b1d
LD		 342 if (!num_devices)
343 return -EOPNOTSUPP;
f7039b1d
LD		 344 if (copy_from_user(&range, arg, sizeof(range)))
345 return -EFAULT;
e515c18b
LC		 346 if (range.start > total_bytes ||
347 range.len < fs_info->sb->s_blocksize)
f4c697e6 348 return -EINVAL;
f7039b1d 349
f4c697e6 350 range.len = min(range.len, total_bytes - range.start);
f7039b1d 351 range.minlen = max(range.minlen, minlen);
815745cf 352 ret = btrfs_trim_fs(fs_info->tree_root, &range);
f7039b1d
LD		 353 if (ret < 0)
354 return ret;
355
356 if (copy_to_user(arg, &range, sizeof(range)))
357 return -EFAULT;
358
359 return 0;
360}
361
cb8e7090
CH		 362static noinline int create_subvol(struct btrfs_root *root,
363 struct dentry *dentry,
72fd032e 364 char *name, int namelen,
6f72c7e2
AJ		 365 u64 *async_transid,
366 struct btrfs_qgroup_inherit **inherit)
f46b5a66
CH		 367{
368 struct btrfs_trans_handle *trans;
369 struct btrfs_key key;
370 struct btrfs_root_item root_item;
371 struct btrfs_inode_item *inode_item;
372 struct extent_buffer *leaf;
76dda93c 373 struct btrfs_root *new_root;
2fbe8c8a 374 struct dentry *parent = dentry->d_parent;
6a912213 375 struct inode *dir;
8ea05e3a 376 struct timespec cur_time = CURRENT_TIME;
f46b5a66
CH		 377 int ret;
378 int err;
379 u64 objectid;
380 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
3de4586c 381 u64 index = 0;
8ea05e3a 382 uuid_le new_uuid;
f46b5a66 383
581bb050 384 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
2fbe8c8a 385 if (ret)
a22285a6 386 return ret;
6a912213
JB		 387
388 dir = parent->d_inode;
389
9ed74f2d
JB		 390 /*
391 * 1 - inode item
392 * 2 - refs
393 * 1 - root item
394 * 2 - dir items
395 */
a22285a6 396 trans = btrfs_start_transaction(root, 6);
2fbe8c8a 397 if (IS_ERR(trans))
a22285a6 398 return PTR_ERR(trans);
f46b5a66 399
6f72c7e2
AJ		 400 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid,
401 inherit ? *inherit : NULL);
402 if (ret)
403 goto fail;
404
5d4f98a2 405 leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
5581a51a 406 0, objectid, NULL, 0, 0, 0);
8e8a1e31
JB		 407 if (IS_ERR(leaf)) {
408 ret = PTR_ERR(leaf);
409 goto fail;
410 }
f46b5a66 411
5d4f98a2 412 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
f46b5a66
CH		 413 btrfs_set_header_bytenr(leaf, leaf->start);
414 btrfs_set_header_generation(leaf, trans->transid);
5d4f98a2 415 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
f46b5a66
CH		 416 btrfs_set_header_owner(leaf, objectid);
417
418 write_extent_buffer(leaf, root->fs_info->fsid,
419 (unsigned long)btrfs_header_fsid(leaf),
420 BTRFS_FSID_SIZE);
5d4f98a2
YZ		 421 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
422 (unsigned long)btrfs_header_chunk_tree_uuid(leaf),
423 BTRFS_UUID_SIZE);
f46b5a66
CH		 424 btrfs_mark_buffer_dirty(leaf);
425
8ea05e3a
AB		 426 memset(&root_item, 0, sizeof(root_item));
427
f46b5a66 428 inode_item = &root_item.inode;
f46b5a66
CH		 429 inode_item->generation = cpu_to_le64(1);
430 inode_item->size = cpu_to_le64(3);
431 inode_item->nlink = cpu_to_le32(1);
a76a3cd4 432 inode_item->nbytes = cpu_to_le64(root->leafsize);
f46b5a66
CH		 433 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
434
08fe4db1
LZ		 435 root_item.flags = 0;
436 root_item.byte_limit = 0;
437 inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT);
438
f46b5a66 439 btrfs_set_root_bytenr(&root_item, leaf->start);
84234f3a 440 btrfs_set_root_generation(&root_item, trans->transid);
f46b5a66
CH		 441 btrfs_set_root_level(&root_item, 0);
442 btrfs_set_root_refs(&root_item, 1);
86b9f2ec 443 btrfs_set_root_used(&root_item, leaf->len);
80ff3856 444 btrfs_set_root_last_snapshot(&root_item, 0);
f46b5a66 445
8ea05e3a
AB		 446 btrfs_set_root_generation_v2(&root_item,
447 btrfs_root_generation(&root_item));
448 uuid_le_gen(&new_uuid);
449 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
450 root_item.otime.sec = cpu_to_le64(cur_time.tv_sec);
dadd1105 451 root_item.otime.nsec = cpu_to_le32(cur_time.tv_nsec);
8ea05e3a
AB		 452 root_item.ctime = root_item.otime;
453 btrfs_set_root_ctransid(&root_item, trans->transid);
454 btrfs_set_root_otransid(&root_item, trans->transid);
f46b5a66 455
925baedd 456 btrfs_tree_unlock(leaf);
f46b5a66
CH		 457 free_extent_buffer(leaf);
458 leaf = NULL;
459
460 btrfs_set_root_dirid(&root_item, new_dirid);
461
462 key.objectid = objectid;
5d4f98a2 463 key.offset = 0;
f46b5a66
CH		 464 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
465 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
466 &root_item);
467 if (ret)
468 goto fail;
469
76dda93c
YZ		 470 key.offset = (u64)-1;
471 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
79787eaa
JM		 472 if (IS_ERR(new_root)) {
473 btrfs_abort_transaction(trans, root, PTR_ERR(new_root));
474 ret = PTR_ERR(new_root);
475 goto fail;
476 }
76dda93c
YZ		 477
478 btrfs_record_root_in_trans(trans, new_root);
479
d82a6f1d 480 ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
ce598979
MF		 481 if (ret) {
482 /* We potentially lose an unused inode item here */
79787eaa 483 btrfs_abort_transaction(trans, root, ret);
ce598979
MF		 484 goto fail;
485 }
486
f46b5a66
CH		 487 /*
488 * insert the directory item
489 */
3de4586c 490 ret = btrfs_set_inode_index(dir, &index);
79787eaa
JM		 491 if (ret) {
492 btrfs_abort_transaction(trans, root, ret);
493 goto fail;
494 }
3de4586c
CM		 495
496 ret = btrfs_insert_dir_item(trans, root,
16cdcec7 497 name, namelen, dir, &key,
3de4586c 498 BTRFS_FT_DIR, index);
79787eaa
JM		 499 if (ret) {
500 btrfs_abort_transaction(trans, root, ret);
f46b5a66 501 goto fail;
79787eaa 502 }
0660b5af 503
52c26179
YZ		 504 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
505 ret = btrfs_update_inode(trans, root, dir);
506 BUG_ON(ret);
507
0660b5af 508 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
4df27c4d 509 objectid, root->root_key.objectid,
33345d01 510 btrfs_ino(dir), index, name, namelen);
0660b5af 511
76dda93c 512 BUG_ON(ret);
f46b5a66 513
76dda93c 514 d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
f46b5a66 515fail:
72fd032e
SW		 516 if (async_transid) {
517 *async_transid = trans->transid;
518 err = btrfs_commit_transaction_async(trans, root, 1);
519 } else {
520 err = btrfs_commit_transaction(trans, root);
521 }
f46b5a66
CH		 522 if (err && !ret)
523 ret = err;
f46b5a66
CH		 524 return ret;
525}
526
72fd032e 527static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
b83cc969 528 char *name, int namelen, u64 *async_transid,
6f72c7e2 529 bool readonly, struct btrfs_qgroup_inherit **inherit)
f46b5a66 530{
2e4bfab9 531 struct inode *inode;
f46b5a66
CH		 532 struct btrfs_pending_snapshot *pending_snapshot;
533 struct btrfs_trans_handle *trans;
2e4bfab9 534 int ret;
f46b5a66
CH		 535
536 if (!root->ref_cows)
537 return -EINVAL;
538
3de4586c 539 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
a22285a6
YZ		 540 if (!pending_snapshot)
541 return -ENOMEM;
542
66d8f3dd
MX		 543 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
544 BTRFS_BLOCK_RSV_TEMP);
3de4586c 545 pending_snapshot->dentry = dentry;
f46b5a66 546 pending_snapshot->root = root;
b83cc969 547 pending_snapshot->readonly = readonly;
6f72c7e2
AJ		 548 if (inherit) {
549 pending_snapshot->inherit = *inherit;
550 *inherit = NULL; /* take responsibility to free it */
551 }
a22285a6 552
48c03c4b 553 trans = btrfs_start_transaction(root->fs_info->extent_root, 6);
a22285a6
YZ		 554 if (IS_ERR(trans)) {
555 ret = PTR_ERR(trans);
556 goto fail;
557 }
558
559 ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
560 BUG_ON(ret);
561
8351583e 562 spin_lock(&root->fs_info->trans_lock);
f46b5a66
CH		 563 list_add(&pending_snapshot->list,
564 &trans->transaction->pending_snapshots);
8351583e 565 spin_unlock(&root->fs_info->trans_lock);
72fd032e
SW		 566 if (async_transid) {
567 *async_transid = trans->transid;
568 ret = btrfs_commit_transaction_async(trans,
569 root->fs_info->extent_root, 1);
570 } else {
571 ret = btrfs_commit_transaction(trans,
572 root->fs_info->extent_root);
573 }
c37b2b62
JB		 574 if (ret)
575 goto fail;
a22285a6
YZ		 576
577 ret = pending_snapshot->error;
578 if (ret)
579 goto fail;
580
66b4ffd1
JB		 581 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
582 if (ret)
583 goto fail;
f46b5a66 584
2fbe8c8a 585 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 586 if (IS_ERR(inode)) {
587 ret = PTR_ERR(inode);
588 goto fail;
589 }
590 BUG_ON(!inode);
591 d_instantiate(dentry, inode);
592 ret = 0;
593fail:
a22285a6 594 kfree(pending_snapshot);
f46b5a66
CH		 595 return ret;
596}
597
4260f7c7
SW		 598/* copy of check_sticky in fs/namei.c()
599* It's inline, so penalty for filesystems that don't use sticky bit is
600* minimal.
601*/
602static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
603{
2f2f43d3 604 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 605
606 if (!(dir->i_mode & S_ISVTX))
607 return 0;
2f2f43d3 608 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 609 return 0;
2f2f43d3 610 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 611 return 0;
612 return !capable(CAP_FOWNER);
613}
614
615/* copy of may_delete in fs/namei.c()
616 * Check whether we can remove a link victim from directory dir, check
617 * whether the type of victim is right.
618 * 1. We can't do it if dir is read-only (done in permission())
619 * 2. We should have write and exec permissions on dir
620 * 3. We can't remove anything from append-only dir
621 * 4. We can't do anything with immutable dir (done in permission())
622 * 5. If the sticky bit on dir is set we should either
623 * a. be owner of dir, or
624 * b. be owner of victim, or
625 * c. have CAP_FOWNER capability
626 * 6. If the victim is append-only or immutable we can't do antyhing with
627 * links pointing to it.
628 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
629 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
630 * 9. We can't remove a root or mountpoint.
631 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
632 * nfs_async_unlink().
633 */
634
635static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
636{
637 int error;
638
639 if (!victim->d_inode)
640 return -ENOENT;
641
642 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 643 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 644
645 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
646 if (error)
647 return error;
648 if (IS_APPEND(dir))
649 return -EPERM;
650 if (btrfs_check_sticky(dir, victim->d_inode)||
651 IS_APPEND(victim->d_inode)||
652 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
653 return -EPERM;
654 if (isdir) {
655 if (!S_ISDIR(victim->d_inode->i_mode))
656 return -ENOTDIR;
657 if (IS_ROOT(victim))
658 return -EBUSY;
659 } else if (S_ISDIR(victim->d_inode->i_mode))
660 return -EISDIR;
661 if (IS_DEADDIR(dir))
662 return -ENOENT;
663 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
664 return -EBUSY;
665 return 0;
666}
667
cb8e7090
CH		 668/* copy of may_create in fs/namei.c() */
669static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
670{
671 if (child->d_inode)
672 return -EEXIST;
673 if (IS_DEADDIR(dir))
674 return -ENOENT;
675 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
676}
677
678/*
679 * Create a new subvolume below @parent. This is largely modeled after
680 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
681 * inside this filesystem so it's quite a bit simpler.
682 */
76dda93c
YZ		 683static noinline int btrfs_mksubvol(struct path *parent,
684 char *name, int namelen,
72fd032e 685 struct btrfs_root *snap_src,
6f72c7e2
AJ		 686 u64 *async_transid, bool readonly,
687 struct btrfs_qgroup_inherit **inherit)
cb8e7090 688{
76dda93c 689 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 690 struct dentry *dentry;
691 int error;
692
76dda93c 693 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
cb8e7090
CH		 694
695 dentry = lookup_one_len(name, parent->dentry, namelen);
696 error = PTR_ERR(dentry);
697 if (IS_ERR(dentry))
698 goto out_unlock;
699
700 error = -EEXIST;
701 if (dentry->d_inode)
702 goto out_dput;
703
76dda93c 704 error = btrfs_may_create(dir, dentry);
cb8e7090 705 if (error)
a874a63e 706 goto out_dput;
cb8e7090 707
76dda93c
YZ		 708 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
709
710 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
711 goto out_up_read;
712
3de4586c 713 if (snap_src) {
6f72c7e2
AJ		 714 error = create_snapshot(snap_src, dentry, name, namelen,
715 async_transid, readonly, inherit);
3de4586c 716 } else {
76dda93c 717 error = create_subvol(BTRFS_I(dir)->root, dentry,
6f72c7e2 718 name, namelen, async_transid, inherit);
3de4586c 719 }
76dda93c
YZ		 720 if (!error)
721 fsnotify_mkdir(dir, dentry);
722out_up_read:
723 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 724out_dput:
725 dput(dentry);
726out_unlock:
76dda93c 727 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 728 return error;
729}
730
4cb5300b
CM		 731/*
732 * When we're defragging a range, we don't want to kick it off again
733 * if it is really just waiting for delalloc to send it down.
734 * If we find a nice big extent or delalloc range for the bytes in the
735 * file you want to defrag, we return 0 to let you know to skip this
736 * part of the file
737 */
738static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
739{
740 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
741 struct extent_map *em = NULL;
742 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
743 u64 end;
744
745 read_lock(&em_tree->lock);
746 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
747 read_unlock(&em_tree->lock);
748
749 if (em) {
750 end = extent_map_end(em);
751 free_extent_map(em);
752 if (end - offset > thresh)
753 return 0;
754 }
755 /* if we already have a nice delalloc here, just stop */
756 thresh /= 2;
757 end = count_range_bits(io_tree, &offset, offset + thresh,
758 thresh, EXTENT_DELALLOC, 1);
759 if (end >= thresh)
760 return 0;
761 return 1;
762}
763
764/*
765 * helper function to walk through a file and find extents
766 * newer than a specific transid, and smaller than thresh.
767 *
768 * This is used by the defragging code to find new and small
769 * extents
770 */
771static int find_new_extents(struct btrfs_root *root,
772 struct inode *inode, u64 newer_than,
773 u64 *off, int thresh)
774{
775 struct btrfs_path *path;
776 struct btrfs_key min_key;
777 struct btrfs_key max_key;
778 struct extent_buffer *leaf;
779 struct btrfs_file_extent_item *extent;
780 int type;
781 int ret;
a4689d2b 782 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 783
784 path = btrfs_alloc_path();
785 if (!path)
786 return -ENOMEM;
787
a4689d2b 788 min_key.objectid = ino;
4cb5300b
CM		 789 min_key.type = BTRFS_EXTENT_DATA_KEY;
790 min_key.offset = *off;
791
a4689d2b 792 max_key.objectid = ino;
4cb5300b
CM		 793 max_key.type = (u8)-1;
794 max_key.offset = (u64)-1;
795
796 path->keep_locks = 1;
797
798 while(1) {
799 ret = btrfs_search_forward(root, &min_key, &max_key,
800 path, 0, newer_than);
801 if (ret != 0)
802 goto none;
a4689d2b 803 if (min_key.objectid != ino)
4cb5300b
CM		 804 goto none;
805 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
806 goto none;
807
808 leaf = path->nodes[0];
809 extent = btrfs_item_ptr(leaf, path->slots[0],
810 struct btrfs_file_extent_item);
811
812 type = btrfs_file_extent_type(leaf, extent);
813 if (type == BTRFS_FILE_EXTENT_REG &&
814 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
815 check_defrag_in_cache(inode, min_key.offset, thresh)) {
816 *off = min_key.offset;
817 btrfs_free_path(path);
818 return 0;
819 }
820
821 if (min_key.offset == (u64)-1)
822 goto none;
823
824 min_key.offset++;
825 btrfs_release_path(path);
826 }
827none:
828 btrfs_free_path(path);
829 return -ENOENT;
830}
831
6c282eb4 832static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 833{
834 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 835 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
836 struct extent_map *em;
837 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 838
6c282eb4
LZ		 839 /*
840 * hopefully we have this extent in the tree already, try without
841 * the full extent lock
842 */
17ce6ef8 843 read_lock(&em_tree->lock);
6c282eb4 844 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 845 read_unlock(&em_tree->lock);
846
6c282eb4
LZ		 847 if (!em) {
848 /* get the big lock and read metadata off disk */
849 lock_extent(io_tree, start, start + len - 1);
850 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
851 unlock_extent(io_tree, start, start + len - 1);
852
853 if (IS_ERR(em))
854 return NULL;
855 }
856
857 return em;
858}
17ce6ef8 859
6c282eb4
LZ		 860static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
861{
862 struct extent_map *next;
863 bool ret = true;
864
865 /* this is the last extent */
866 if (em->start + em->len >= i_size_read(inode))
867 return false;
868
869 next = defrag_lookup_extent(inode, em->start + em->len);
870 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
871 ret = false;
872
873 free_extent_map(next);
17ce6ef8
LB		 874 return ret;
875}
876
6c282eb4 877static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 878 u64 *last_len, u64 *skip, u64 *defrag_end,
879 int compress)
940100a4 880{
6c282eb4 881 struct extent_map *em;
940100a4 882 int ret = 1;
6c282eb4 883 bool next_mergeable = true;
940100a4
CM		 884
885 /*
008873ea 886 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 887 * defragging it
888 */
889 if (start < *defrag_end)
890 return 1;
891
892 *skip = 0;
893
6c282eb4
LZ		 894 em = defrag_lookup_extent(inode, start);
895 if (!em)
896 return 0;
940100a4
CM		 897
898 /* this will cover holes, and inline extents */
17ce6ef8 899 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 900 ret = 0;
17ce6ef8
LB		 901 goto out;
902 }
903
6c282eb4 904 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 905
906 /*
6c282eb4
LZ		 907 * we hit a real extent, if it is big or the next extent is not a
908 * real extent, don't bother defragging it
940100a4 909 */
a43a2111 910 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 911 (em->len >= thresh || !next_mergeable))
940100a4 912 ret = 0;
17ce6ef8 913out:
940100a4
CM		 914 /*
915 * last_len ends up being a counter of how many bytes we've defragged.
916 * every time we choose not to defrag an extent, we reset *last_len
917 * so that the next tiny extent will force a defrag.
918 *
919 * The end result of this is that tiny extents before a single big
920 * extent will force at least part of that big extent to be defragged.
921 */
922 if (ret) {
940100a4
CM		 923 *defrag_end = extent_map_end(em);
924 } else {
925 *last_len = 0;
926 *skip = extent_map_end(em);
927 *defrag_end = 0;
928 }
929
930 free_extent_map(em);
931 return ret;
932}
933
4cb5300b
CM		 934/*
935 * it doesn't do much good to defrag one or two pages
936 * at a time. This pulls in a nice chunk of pages
937 * to COW and defrag.
938 *
939 * It also makes sure the delalloc code has enough
940 * dirty data to avoid making new small extents as part
941 * of the defrag
942 *
943 * It's a good idea to start RA on this range
944 * before calling this.
945 */
946static int cluster_pages_for_defrag(struct inode *inode,
947 struct page **pages,
948 unsigned long start_index,
949 int num_pages)
f46b5a66 950{
4cb5300b
CM		 951 unsigned long file_end;
952 u64 isize = i_size_read(inode);
953 u64 page_start;
954 u64 page_end;
1f12bd06 955 u64 page_cnt;
4cb5300b
CM		 956 int ret;
957 int i;
958 int i_done;
3eaa2885 959 struct btrfs_ordered_extent *ordered;
4cb5300b 960 struct extent_state *cached_state = NULL;
600a45e1 961 struct extent_io_tree *tree;
3b16a4e3 962 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 963
4cb5300b 964 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 965 if (!isize || start_index > file_end)
966 return 0;
967
968 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 969
970 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 971 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 972 if (ret)
973 return ret;
4cb5300b 974 i_done = 0;
600a45e1 975 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 976
977 /* step one, lock all the pages */
1f12bd06 978 for (i = 0; i < page_cnt; i++) {
4cb5300b 979 struct page *page;
600a45e1 980again:
a94733d0 981 page = find_or_create_page(inode->i_mapping,
600a45e1 982 start_index + i, mask);
4cb5300b
CM		 983 if (!page)
984 break;
985
600a45e1
MX		 986 page_start = page_offset(page);
987 page_end = page_start + PAGE_CACHE_SIZE - 1;
988 while (1) {
d0082371 989 lock_extent(tree, page_start, page_end);
600a45e1
MX		 990 ordered = btrfs_lookup_ordered_extent(inode,
991 page_start);
d0082371 992 unlock_extent(tree, page_start, page_end);
600a45e1
MX		 993 if (!ordered)
994 break;
995
996 unlock_page(page);
997 btrfs_start_ordered_extent(inode, ordered, 1);
998 btrfs_put_ordered_extent(ordered);
999 lock_page(page);
1f12bd06
LB		 1000 /*
1001 * we unlocked the page above, so we need check if
1002 * it was released or not.
1003 */
1004 if (page->mapping != inode->i_mapping) {
1005 unlock_page(page);
1006 page_cache_release(page);
1007 goto again;
1008 }
600a45e1
MX		 1009 }
1010
4cb5300b
CM		 1011 if (!PageUptodate(page)) {
1012 btrfs_readpage(NULL, page);
1013 lock_page(page);
1014 if (!PageUptodate(page)) {
1015 unlock_page(page);
1016 page_cache_release(page);
1017 ret = -EIO;
1018 break;
1019 }
1020 }
600a45e1 1021
600a45e1
MX		 1022 if (page->mapping != inode->i_mapping) {
1023 unlock_page(page);
1024 page_cache_release(page);
1025 goto again;
1026 }
1027
4cb5300b
CM		 1028 pages[i] = page;
1029 i_done++;
1030 }
1031 if (!i_done || ret)
1032 goto out;
1033
1034 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1035 goto out;
1036
1037 /*
1038 * so now we have a nice long stream of locked
1039 * and up to date pages, lets wait on them
1040 */
1041 for (i = 0; i < i_done; i++)
1042 wait_on_page_writeback(pages[i]);
1043
1044 page_start = page_offset(pages[0]);
1045 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1046
1047 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1048 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1049 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1050 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1051 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1052 &cached_state, GFP_NOFS);
4cb5300b 1053
1f12bd06 1054 if (i_done != page_cnt) {
9e0baf60
JB		 1055 spin_lock(&BTRFS_I(inode)->lock);
1056 BTRFS_I(inode)->outstanding_extents++;
1057 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1058 btrfs_delalloc_release_space(inode,
1f12bd06 1059 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1060 }
1061
1062
9e8a4a8b
LB		 1063 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1064 &cached_state, GFP_NOFS);
4cb5300b
CM		 1065
1066 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1067 page_start, page_end - 1, &cached_state,
1068 GFP_NOFS);
1069
1070 for (i = 0; i < i_done; i++) {
1071 clear_page_dirty_for_io(pages[i]);
1072 ClearPageChecked(pages[i]);
1073 set_page_extent_mapped(pages[i]);
1074 set_page_dirty(pages[i]);
1075 unlock_page(pages[i]);
1076 page_cache_release(pages[i]);
1077 }
1078 return i_done;
1079out:
1080 for (i = 0; i < i_done; i++) {
1081 unlock_page(pages[i]);
1082 page_cache_release(pages[i]);
1083 }
1f12bd06 1084 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1085 return ret;
1086
1087}
1088
1089int btrfs_defrag_file(struct inode *inode, struct file *file,
1090 struct btrfs_ioctl_defrag_range_args *range,
1091 u64 newer_than, unsigned long max_to_defrag)
1092{
1093 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1094 struct file_ra_state *ra = NULL;
f46b5a66 1095 unsigned long last_index;
151a31b2 1096 u64 isize = i_size_read(inode);
940100a4
CM		 1097 u64 last_len = 0;
1098 u64 skip = 0;
1099 u64 defrag_end = 0;
4cb5300b 1100 u64 newer_off = range->start;
f46b5a66 1101 unsigned long i;
008873ea 1102 unsigned long ra_index = 0;
f46b5a66 1103 int ret;
4cb5300b 1104 int defrag_count = 0;
1a419d85 1105 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1106 int extent_thresh = range->extent_thresh;
008873ea
LZ		 1107 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1108 int cluster = max_cluster;
4cb5300b
CM		 1109 u64 new_align = ~((u64)128 * 1024 - 1);
1110 struct page **pages = NULL;
1111
1112 if (extent_thresh == 0)
1113 extent_thresh = 256 * 1024;
1a419d85
LZ		 1114
1115 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1116 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1117 return -EINVAL;
1118 if (range->compress_type)
1119 compress_type = range->compress_type;
1120 }
f46b5a66 1121
151a31b2 1122 if (isize == 0)
940100a4
CM		 1123 return 0;
1124
4cb5300b
CM		 1125 /*
1126 * if we were not given a file, allocate a readahead
1127 * context
1128 */
1129 if (!file) {
1130 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1131 if (!ra)
1132 return -ENOMEM;
1133 file_ra_state_init(ra, inode->i_mapping);
1134 } else {
1135 ra = &file->f_ra;
1136 }
1137
008873ea 1138 pages = kmalloc(sizeof(struct page *) * max_cluster,
4cb5300b
CM		 1139 GFP_NOFS);
1140 if (!pages) {
1141 ret = -ENOMEM;
1142 goto out_ra;
1143 }
1144
1145 /* find the last page to defrag */
1e701a32 1146 if (range->start + range->len > range->start) {
151a31b2 1147 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1148 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1149 } else {
151a31b2 1150 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1151 }
1152
4cb5300b
CM		 1153 if (newer_than) {
1154 ret = find_new_extents(root, inode, newer_than,
1155 &newer_off, 64 * 1024);
1156 if (!ret) {
1157 range->start = newer_off;
1158 /*
1159 * we always align our defrag to help keep
1160 * the extents in the file evenly spaced
1161 */
1162 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1163 } else
1164 goto out_ra;
1165 } else {
1166 i = range->start >> PAGE_CACHE_SHIFT;
1167 }
1168 if (!max_to_defrag)
7ec31b54 1169 max_to_defrag = last_index + 1;
4cb5300b 1170
2a0f7f57
LZ		 1171 /*
1172 * make writeback starts from i, so the defrag range can be
1173 * written sequentially.
1174 */
1175 if (i < inode->i_mapping->writeback_index)
1176 inode->i_mapping->writeback_index = i;
1177
f7f43cc8
CM		 1178 while (i <= last_index && defrag_count < max_to_defrag &&
1179 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1180 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1181 /*
1182 * make sure we stop running if someone unmounts
1183 * the FS
1184 */
1185 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1186 break;
1187
66c26892 1188 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1189 extent_thresh, &last_len, &skip,
a43a2111
AM		 1190 &defrag_end, range->flags &
1191 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1192 unsigned long next;
1193 /*
1194 * the should_defrag function tells us how much to skip
1195 * bump our counter by the suggested amount
1196 */
1197 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1198 i = max(i + 1, next);
1199 continue;
1200 }
008873ea
LZ		 1201
1202 if (!newer_than) {
1203 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1204 PAGE_CACHE_SHIFT) - i;
1205 cluster = min(cluster, max_cluster);
1206 } else {
1207 cluster = max_cluster;
1208 }
1209
1e701a32 1210 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1a419d85 1211 BTRFS_I(inode)->force_compress = compress_type;
940100a4 1212
008873ea
LZ		 1213 if (i + cluster > ra_index) {
1214 ra_index = max(i, ra_index);
1215 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1216 cluster);
1217 ra_index += max_cluster;
1218 }
940100a4 1219
ecb8bea8 1220 mutex_lock(&inode->i_mutex);
008873ea 1221 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1222 if (ret < 0) {
1223 mutex_unlock(&inode->i_mutex);
4cb5300b 1224 goto out_ra;
ecb8bea8 1225 }
4cb5300b
CM		 1226
1227 defrag_count += ret;
1228 balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
ecb8bea8 1229 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1230
1231 if (newer_than) {
1232 if (newer_off == (u64)-1)
1233 break;
1234
e1f041e1
LB		 1235 if (ret > 0)
1236 i += ret;
1237
4cb5300b
CM		 1238 newer_off = max(newer_off + 1,
1239 (u64)i << PAGE_CACHE_SHIFT);
1240
1241 ret = find_new_extents(root, inode,
1242 newer_than, &newer_off,
1243 64 * 1024);
1244 if (!ret) {
1245 range->start = newer_off;
1246 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1247 } else {
1248 break;
f46b5a66 1249 }
4cb5300b 1250 } else {
008873ea 1251 if (ret > 0) {
cbcc8326 1252 i += ret;
008873ea
LZ		 1253 last_len += ret << PAGE_CACHE_SHIFT;
1254 } else {
cbcc8326 1255 i++;
008873ea
LZ		 1256 last_len = 0;
1257 }
f46b5a66 1258 }
f46b5a66
CH		 1259 }
1260
1e701a32
CM		 1261 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1262 filemap_flush(inode->i_mapping);
1263
1264 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1265 /* the filemap_flush will queue IO into the worker threads, but
1266 * we have to make sure the IO is actually started and that
1267 * ordered extents get created before we return
1268 */
1269 atomic_inc(&root->fs_info->async_submit_draining);
1270 while (atomic_read(&root->fs_info->nr_async_submits) ||
1271 atomic_read(&root->fs_info->async_delalloc_pages)) {
1272 wait_event(root->fs_info->async_submit_wait,
1273 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1274 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1275 }
1276 atomic_dec(&root->fs_info->async_submit_draining);
1277
1278 mutex_lock(&inode->i_mutex);
261507a0 1279 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1e701a32
CM		 1280 mutex_unlock(&inode->i_mutex);
1281 }
1282
1a419d85 1283 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1284 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1285 }
1286
60ccf82f 1287 ret = defrag_count;
940100a4 1288
4cb5300b
CM		 1289out_ra:
1290 if (!file)
1291 kfree(ra);
1292 kfree(pages);
940100a4 1293 return ret;
f46b5a66
CH		 1294}
1295
76dda93c
YZ		 1296static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
1297 void __user *arg)
f46b5a66
CH		 1298{
1299 u64 new_size;
1300 u64 old_size;
1301 u64 devid = 1;
1302 struct btrfs_ioctl_vol_args *vol_args;
1303 struct btrfs_trans_handle *trans;
1304 struct btrfs_device *device = NULL;
1305 char *sizestr;
1306 char *devstr = NULL;
1307 int ret = 0;
f46b5a66
CH		 1308 int mod = 0;
1309
c146afad
YZ		 1310 if (root->fs_info->sb->s_flags & MS_RDONLY)
1311 return -EROFS;
1312
e441d54d
CM		 1313 if (!capable(CAP_SYS_ADMIN))
1314 return -EPERM;
1315
c9e9f97b
ID		 1316 mutex_lock(&root->fs_info->volume_mutex);
1317 if (root->fs_info->balance_ctl) {
1318 printk(KERN_INFO "btrfs: balance in progress\n");
1319 ret = -EINVAL;
1320 goto out;
1321 }
1322
dae7b665 1323 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1324 if (IS_ERR(vol_args)) {
1325 ret = PTR_ERR(vol_args);
1326 goto out;
1327 }
5516e595
MF		 1328
1329 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1330
f46b5a66
CH		 1331 sizestr = vol_args->name;
1332 devstr = strchr(sizestr, ':');
1333 if (devstr) {
1334 char *end;
1335 sizestr = devstr + 1;
1336 *devstr = '\0';
1337 devstr = vol_args->name;
1338 devid = simple_strtoull(devstr, &end, 10);
5bb14682 1339 printk(KERN_INFO "btrfs: resizing devid %llu\n",
21380931 1340 (unsigned long long)devid);
f46b5a66 1341 }
2b82032c 1342 device = btrfs_find_device(root, devid, NULL, NULL);
f46b5a66 1343 if (!device) {
5bb14682 1344 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
21380931 1345 (unsigned long long)devid);
f46b5a66 1346 ret = -EINVAL;
c9e9f97b 1347 goto out_free;
f46b5a66 1348 }
4e42ae1b
LB		 1349 if (device->fs_devices && device->fs_devices->seeding) {
1350 printk(KERN_INFO "btrfs: resizer unable to apply on "
a8c4a33b
CM		 1351 "seeding device %llu\n",
1352 (unsigned long long)devid);
4e42ae1b
LB		 1353 ret = -EINVAL;
1354 goto out_free;
1355 }
1356
f46b5a66
CH		 1357 if (!strcmp(sizestr, "max"))
1358 new_size = device->bdev->bd_inode->i_size;
1359 else {
1360 if (sizestr[0] == '-') {
1361 mod = -1;
1362 sizestr++;
1363 } else if (sizestr[0] == '+') {
1364 mod = 1;
1365 sizestr++;
1366 }
91748467 1367 new_size = memparse(sizestr, NULL);
f46b5a66
CH		 1368 if (new_size == 0) {
1369 ret = -EINVAL;
c9e9f97b 1370 goto out_free;
f46b5a66
CH		 1371 }
1372 }
1373
1374 old_size = device->total_bytes;
1375
1376 if (mod < 0) {
1377 if (new_size > old_size) {
1378 ret = -EINVAL;
c9e9f97b 1379 goto out_free;
f46b5a66
CH		 1380 }
1381 new_size = old_size - new_size;
1382 } else if (mod > 0) {
1383 new_size = old_size + new_size;
1384 }
1385
1386 if (new_size < 256 * 1024 * 1024) {
1387 ret = -EINVAL;
c9e9f97b 1388 goto out_free;
f46b5a66
CH		 1389 }
1390 if (new_size > device->bdev->bd_inode->i_size) {
1391 ret = -EFBIG;
c9e9f97b 1392 goto out_free;
f46b5a66
CH		 1393 }
1394
1395 do_div(new_size, root->sectorsize);
1396 new_size *= root->sectorsize;
1397
606686ee
JB		 1398 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1399 rcu_str_deref(device->name),
1400 (unsigned long long)new_size);
f46b5a66
CH		 1401
1402 if (new_size > old_size) {
a22285a6 1403 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1404 if (IS_ERR(trans)) {
1405 ret = PTR_ERR(trans);
c9e9f97b 1406 goto out_free;
98d5dc13 1407 }
f46b5a66
CH		 1408 ret = btrfs_grow_device(trans, device, new_size);
1409 btrfs_commit_transaction(trans, root);
ece7d20e 1410 } else if (new_size < old_size) {
f46b5a66
CH		 1411 ret = btrfs_shrink_device(device, new_size);
1412 }
1413
c9e9f97b 1414out_free:
f46b5a66 1415 kfree(vol_args);
c9e9f97b
ID		 1416out:
1417 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 1418 return ret;
1419}
1420
72fd032e 1421static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1422 char *name, unsigned long fd, int subvol,
1423 u64 *transid, bool readonly,
1424 struct btrfs_qgroup_inherit **inherit)
f46b5a66 1425{
f46b5a66 1426 int namelen;
3de4586c 1427 int ret = 0;
f46b5a66 1428
a874a63e
LB		 1429 ret = mnt_want_write_file(file);
1430 if (ret)
1431 goto out;
1432
72fd032e
SW		 1433 namelen = strlen(name);
1434 if (strchr(name, '/')) {
f46b5a66 1435 ret = -EINVAL;
a874a63e 1436 goto out_drop_write;
f46b5a66
CH		 1437 }
1438
16780cab
CM		 1439 if (name[0] == '.' &&
1440 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1441 ret = -EEXIST;
a874a63e 1442 goto out_drop_write;
16780cab
CM		 1443 }
1444
3de4586c 1445 if (subvol) {
72fd032e 1446 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1447 NULL, transid, readonly, inherit);
cb8e7090 1448 } else {
2903ff01 1449 struct fd src = fdget(fd);
3de4586c 1450 struct inode *src_inode;
2903ff01 1451 if (!src.file) {
3de4586c 1452 ret = -EINVAL;
a874a63e 1453 goto out_drop_write;
3de4586c
CM		 1454 }
1455
2903ff01 1456 src_inode = src.file->f_path.dentry->d_inode;
3de4586c 1457 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
d397712b
CM		 1458 printk(KERN_INFO "btrfs: Snapshot src from "
1459 "another FS\n");
3de4586c 1460 ret = -EINVAL;
ecd18815
AV		 1461 } else {
1462 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1463 BTRFS_I(src_inode)->root,
1464 transid, readonly, inherit);
3de4586c 1465 }
2903ff01 1466 fdput(src);
cb8e7090 1467 }
a874a63e
LB		 1468out_drop_write:
1469 mnt_drop_write_file(file);
f46b5a66 1470out:
72fd032e
SW		 1471 return ret;
1472}
1473
1474static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1475 void __user *arg, int subvol)
72fd032e 1476{
fa0d2b9b 1477 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1478 int ret;
1479
fa0d2b9b
LZ		 1480 vol_args = memdup_user(arg, sizeof(*vol_args));
1481 if (IS_ERR(vol_args))
1482 return PTR_ERR(vol_args);
1483 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1484
fa0d2b9b 1485 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1486 vol_args->fd, subvol,
6f72c7e2 1487 NULL, false, NULL);
fdfb1e4f 1488
fa0d2b9b
LZ		 1489 kfree(vol_args);
1490 return ret;
1491}
fdfb1e4f 1492
fa0d2b9b
LZ		 1493static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1494 void __user *arg, int subvol)
1495{
1496 struct btrfs_ioctl_vol_args_v2 *vol_args;
1497 int ret;
1498 u64 transid = 0;
1499 u64 *ptr = NULL;
b83cc969 1500 bool readonly = false;
6f72c7e2 1501 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1502
fa0d2b9b
LZ		 1503 vol_args = memdup_user(arg, sizeof(*vol_args));
1504 if (IS_ERR(vol_args))
1505 return PTR_ERR(vol_args);
1506 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1507
b83cc969 1508 if (vol_args->flags &
6f72c7e2
AJ		 1509 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1510 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1511 ret = -EOPNOTSUPP;
fa0d2b9b 1512 goto out;
72fd032e 1513 }
fa0d2b9b
LZ		 1514
1515 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1516 ptr = &transid;
b83cc969
LZ		 1517 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1518 readonly = true;
6f72c7e2
AJ		 1519 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1520 if (vol_args->size > PAGE_CACHE_SIZE) {
1521 ret = -EINVAL;
1522 goto out;
1523 }
1524 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1525 if (IS_ERR(inherit)) {
1526 ret = PTR_ERR(inherit);
1527 goto out;
1528 }
1529 }
fa0d2b9b
LZ		 1530
1531 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2
AJ		 1532 vol_args->fd, subvol, ptr,
1533 readonly, &inherit);
fa0d2b9b
LZ		 1534
1535 if (ret == 0 && ptr &&
1536 copy_to_user(arg +
1537 offsetof(struct btrfs_ioctl_vol_args_v2,
1538 transid), ptr, sizeof(*ptr)))
1539 ret = -EFAULT;
fdfb1e4f 1540out:
f46b5a66 1541 kfree(vol_args);
6f72c7e2 1542 kfree(inherit);
f46b5a66
CH		 1543 return ret;
1544}
1545
0caa102d
LZ		 1546static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1547 void __user *arg)
1548{
1549 struct inode *inode = fdentry(file)->d_inode;
1550 struct btrfs_root *root = BTRFS_I(inode)->root;
1551 int ret = 0;
1552 u64 flags = 0;
1553
33345d01 1554 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1555 return -EINVAL;
1556
1557 down_read(&root->fs_info->subvol_sem);
1558 if (btrfs_root_readonly(root))
1559 flags |= BTRFS_SUBVOL_RDONLY;
1560 up_read(&root->fs_info->subvol_sem);
1561
1562 if (copy_to_user(arg, &flags, sizeof(flags)))
1563 ret = -EFAULT;
1564
1565 return ret;
1566}
1567
1568static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1569 void __user *arg)
1570{
1571 struct inode *inode = fdentry(file)->d_inode;
1572 struct btrfs_root *root = BTRFS_I(inode)->root;
1573 struct btrfs_trans_handle *trans;
1574 u64 root_flags;
1575 u64 flags;
1576 int ret = 0;
1577
b9ca0664
LB		 1578 ret = mnt_want_write_file(file);
1579 if (ret)
1580 goto out;
0caa102d 1581
b9ca0664
LB		 1582 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1583 ret = -EINVAL;
1584 goto out_drop_write;
1585 }
0caa102d 1586
b9ca0664
LB		 1587 if (copy_from_user(&flags, arg, sizeof(flags))) {
1588 ret = -EFAULT;
1589 goto out_drop_write;
1590 }
0caa102d 1591
b9ca0664
LB		 1592 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1593 ret = -EINVAL;
1594 goto out_drop_write;
1595 }
0caa102d 1596
b9ca0664
LB		 1597 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1598 ret = -EOPNOTSUPP;
1599 goto out_drop_write;
1600 }
0caa102d 1601
b9ca0664
LB		 1602 if (!inode_owner_or_capable(inode)) {
1603 ret = -EACCES;
1604 goto out_drop_write;
1605 }
b4dc2b8c 1606
0caa102d
LZ		 1607 down_write(&root->fs_info->subvol_sem);
1608
1609 /* nothing to do */
1610 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1611 goto out_drop_sem;
0caa102d
LZ		 1612
1613 root_flags = btrfs_root_flags(&root->root_item);
1614 if (flags & BTRFS_SUBVOL_RDONLY)
1615 btrfs_set_root_flags(&root->root_item,
1616 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1617 else
1618 btrfs_set_root_flags(&root->root_item,
1619 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1620
1621 trans = btrfs_start_transaction(root, 1);
1622 if (IS_ERR(trans)) {
1623 ret = PTR_ERR(trans);
1624 goto out_reset;
1625 }
1626
b4dc2b8c 1627 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1628 &root->root_key, &root->root_item);
1629
1630 btrfs_commit_transaction(trans, root);
1631out_reset:
1632 if (ret)
1633 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1634out_drop_sem:
0caa102d 1635 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1636out_drop_write:
1637 mnt_drop_write_file(file);
1638out:
0caa102d
LZ		 1639 return ret;
1640}
1641
76dda93c
YZ		 1642/*
1643 * helper to check if the subvolume references other subvolumes
1644 */
1645static noinline int may_destroy_subvol(struct btrfs_root *root)
1646{
1647 struct btrfs_path *path;
1648 struct btrfs_key key;
1649 int ret;
1650
1651 path = btrfs_alloc_path();
1652 if (!path)
1653 return -ENOMEM;
1654
1655 key.objectid = root->root_key.objectid;
1656 key.type = BTRFS_ROOT_REF_KEY;
1657 key.offset = (u64)-1;
1658
1659 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1660 &key, path, 0, 0);
1661 if (ret < 0)
1662 goto out;
1663 BUG_ON(ret == 0);
1664
1665 ret = 0;
1666 if (path->slots[0] > 0) {
1667 path->slots[0]--;
1668 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1669 if (key.objectid == root->root_key.objectid &&
1670 key.type == BTRFS_ROOT_REF_KEY)
1671 ret = -ENOTEMPTY;
1672 }
1673out:
1674 btrfs_free_path(path);
1675 return ret;
1676}
1677
ac8e9819
CM		 1678static noinline int key_in_sk(struct btrfs_key *key,
1679 struct btrfs_ioctl_search_key *sk)
1680{
abc6e134
CM		 1681 struct btrfs_key test;
1682 int ret;
1683
1684 test.objectid = sk->min_objectid;
1685 test.type = sk->min_type;
1686 test.offset = sk->min_offset;
1687
1688 ret = btrfs_comp_cpu_keys(key, &test);
1689 if (ret < 0)
ac8e9819 1690 return 0;
abc6e134
CM		 1691
1692 test.objectid = sk->max_objectid;
1693 test.type = sk->max_type;
1694 test.offset = sk->max_offset;
1695
1696 ret = btrfs_comp_cpu_keys(key, &test);
1697 if (ret > 0)
ac8e9819
CM		 1698 return 0;
1699 return 1;
1700}
1701
1702static noinline int copy_to_sk(struct btrfs_root *root,
1703 struct btrfs_path *path,
1704 struct btrfs_key *key,
1705 struct btrfs_ioctl_search_key *sk,
1706 char *buf,
1707 unsigned long *sk_offset,
1708 int *num_found)
1709{
1710 u64 found_transid;
1711 struct extent_buffer *leaf;
1712 struct btrfs_ioctl_search_header sh;
1713 unsigned long item_off;
1714 unsigned long item_len;
1715 int nritems;
1716 int i;
1717 int slot;
ac8e9819
CM		 1718 int ret = 0;
1719
1720 leaf = path->nodes[0];
1721 slot = path->slots[0];
1722 nritems = btrfs_header_nritems(leaf);
1723
1724 if (btrfs_header_generation(leaf) > sk->max_transid) {
1725 i = nritems;
1726 goto advance_key;
1727 }
1728 found_transid = btrfs_header_generation(leaf);
1729
1730 for (i = slot; i < nritems; i++) {
1731 item_off = btrfs_item_ptr_offset(leaf, i);
1732 item_len = btrfs_item_size_nr(leaf, i);
1733
1734 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1735 item_len = 0;
1736
1737 if (sizeof(sh) + item_len + *sk_offset >
1738 BTRFS_SEARCH_ARGS_BUFSIZE) {
1739 ret = 1;
1740 goto overflow;
1741 }
1742
1743 btrfs_item_key_to_cpu(leaf, key, i);
1744 if (!key_in_sk(key, sk))
1745 continue;
1746
1747 sh.objectid = key->objectid;
1748 sh.offset = key->offset;
1749 sh.type = key->type;
1750 sh.len = item_len;
1751 sh.transid = found_transid;
1752
1753 /* copy search result header */
1754 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1755 *sk_offset += sizeof(sh);
1756
1757 if (item_len) {
1758 char *p = buf + *sk_offset;
1759 /* copy the item */
1760 read_extent_buffer(leaf, p,
1761 item_off, item_len);
1762 *sk_offset += item_len;
ac8e9819 1763 }
e2156867 1764 (*num_found)++;
ac8e9819
CM		 1765
1766 if (*num_found >= sk->nr_items)
1767 break;
1768 }
1769advance_key:
abc6e134
CM		 1770 ret = 0;
1771 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1772 key->offset++;
abc6e134
CM		 1773 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1774 key->offset = 0;
ac8e9819 1775 key->type++;
abc6e134
CM		 1776 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1777 key->offset = 0;
1778 key->type = 0;
ac8e9819 1779 key->objectid++;
abc6e134
CM		 1780 } else
1781 ret = 1;
ac8e9819 1782overflow:
ac8e9819
CM		 1783 return ret;
1784}
1785
1786static noinline int search_ioctl(struct inode *inode,
1787 struct btrfs_ioctl_search_args *args)
1788{
1789 struct btrfs_root *root;
1790 struct btrfs_key key;
1791 struct btrfs_key max_key;
1792 struct btrfs_path *path;
1793 struct btrfs_ioctl_search_key *sk = &args->key;
1794 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1795 int ret;
1796 int num_found = 0;
1797 unsigned long sk_offset = 0;
1798
1799 path = btrfs_alloc_path();
1800 if (!path)
1801 return -ENOMEM;
1802
1803 if (sk->tree_id == 0) {
1804 /* search the root of the inode that was passed */
1805 root = BTRFS_I(inode)->root;
1806 } else {
1807 key.objectid = sk->tree_id;
1808 key.type = BTRFS_ROOT_ITEM_KEY;
1809 key.offset = (u64)-1;
1810 root = btrfs_read_fs_root_no_name(info, &key);
1811 if (IS_ERR(root)) {
1812 printk(KERN_ERR "could not find root %llu\n",
1813 sk->tree_id);
1814 btrfs_free_path(path);
1815 return -ENOENT;
1816 }
1817 }
1818
1819 key.objectid = sk->min_objectid;
1820 key.type = sk->min_type;
1821 key.offset = sk->min_offset;
1822
1823 max_key.objectid = sk->max_objectid;
1824 max_key.type = sk->max_type;
1825 max_key.offset = sk->max_offset;
1826
1827 path->keep_locks = 1;
1828
1829 while(1) {
1830 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1831 sk->min_transid);
1832 if (ret != 0) {
1833 if (ret > 0)
1834 ret = 0;
1835 goto err;
1836 }
1837 ret = copy_to_sk(root, path, &key, sk, args->buf,
1838 &sk_offset, &num_found);
b3b4aa74 1839 btrfs_release_path(path);
ac8e9819
CM		 1840 if (ret || num_found >= sk->nr_items)
1841 break;
1842
1843 }
1844 ret = 0;
1845err:
1846 sk->nr_items = num_found;
1847 btrfs_free_path(path);
1848 return ret;
1849}
1850
1851static noinline int btrfs_ioctl_tree_search(struct file *file,
1852 void __user *argp)
1853{
1854 struct btrfs_ioctl_search_args *args;
1855 struct inode *inode;
1856 int ret;
1857
1858 if (!capable(CAP_SYS_ADMIN))
1859 return -EPERM;
1860
2354d08f
JL		 1861 args = memdup_user(argp, sizeof(*args));
1862 if (IS_ERR(args))
1863 return PTR_ERR(args);
ac8e9819 1864
ac8e9819
CM		 1865 inode = fdentry(file)->d_inode;
1866 ret = search_ioctl(inode, args);
1867 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1868 ret = -EFAULT;
1869 kfree(args);
1870 return ret;
1871}
1872
98d377a0 1873/*
ac8e9819
CM		 1874 * Search INODE_REFs to identify path name of 'dirid' directory
1875 * in a 'tree_id' tree. and sets path name to 'name'.
1876 */
98d377a0
TH		 1877static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1878 u64 tree_id, u64 dirid, char *name)
1879{
1880 struct btrfs_root *root;
1881 struct btrfs_key key;
ac8e9819 1882 char *ptr;
98d377a0
TH		 1883 int ret = -1;
1884 int slot;
1885 int len;
1886 int total_len = 0;
1887 struct btrfs_inode_ref *iref;
1888 struct extent_buffer *l;
1889 struct btrfs_path *path;
1890
1891 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1892 name[0]='\0';
1893 return 0;
1894 }
1895
1896 path = btrfs_alloc_path();
1897 if (!path)
1898 return -ENOMEM;
1899
ac8e9819 1900 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 1901
1902 key.objectid = tree_id;
1903 key.type = BTRFS_ROOT_ITEM_KEY;
1904 key.offset = (u64)-1;
1905 root = btrfs_read_fs_root_no_name(info, &key);
1906 if (IS_ERR(root)) {
1907 printk(KERN_ERR "could not find root %llu\n", tree_id);
8ad6fcab
CM		 1908 ret = -ENOENT;
1909 goto out;
98d377a0
TH		 1910 }
1911
1912 key.objectid = dirid;
1913 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 1914 key.offset = (u64)-1;
98d377a0
TH		 1915
1916 while(1) {
1917 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1918 if (ret < 0)
1919 goto out;
1920
1921 l = path->nodes[0];
1922 slot = path->slots[0];
8ad6fcab
CM		 1923 if (ret > 0 && slot > 0)
1924 slot--;
98d377a0
TH		 1925 btrfs_item_key_to_cpu(l, &key, slot);
1926
1927 if (ret > 0 && (key.objectid != dirid ||
ac8e9819
CM		 1928 key.type != BTRFS_INODE_REF_KEY)) {
1929 ret = -ENOENT;
98d377a0 1930 goto out;
ac8e9819 1931 }
98d377a0
TH		 1932
1933 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1934 len = btrfs_inode_ref_name_len(l, iref);
1935 ptr -= len + 1;
1936 total_len += len + 1;
ac8e9819 1937 if (ptr < name)
98d377a0
TH		 1938 goto out;
1939
1940 *(ptr + len) = '/';
1941 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1942
1943 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1944 break;
1945
b3b4aa74 1946 btrfs_release_path(path);
98d377a0 1947 key.objectid = key.offset;
8ad6fcab 1948 key.offset = (u64)-1;
98d377a0 1949 dirid = key.objectid;
98d377a0 1950 }
ac8e9819 1951 if (ptr < name)
98d377a0 1952 goto out;
77906a50 1953 memmove(name, ptr, total_len);
98d377a0
TH		 1954 name[total_len]='\0';
1955 ret = 0;
1956out:
1957 btrfs_free_path(path);
ac8e9819
CM		 1958 return ret;
1959}
1960
1961static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1962 void __user *argp)
1963{
1964 struct btrfs_ioctl_ino_lookup_args *args;
1965 struct inode *inode;
1966 int ret;
1967
1968 if (!capable(CAP_SYS_ADMIN))
1969 return -EPERM;
1970
2354d08f
JL		 1971 args = memdup_user(argp, sizeof(*args));
1972 if (IS_ERR(args))
1973 return PTR_ERR(args);
c2b96929 1974
ac8e9819
CM		 1975 inode = fdentry(file)->d_inode;
1976
1b53ac4d
CM		 1977 if (args->treeid == 0)
1978 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
1979
ac8e9819
CM		 1980 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
1981 args->treeid, args->objectid,
1982 args->name);
1983
1984 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1985 ret = -EFAULT;
1986
1987 kfree(args);
98d377a0
TH		 1988 return ret;
1989}
1990
76dda93c
YZ		 1991static noinline int btrfs_ioctl_snap_destroy(struct file *file,
1992 void __user *arg)
1993{
1994 struct dentry *parent = fdentry(file);
1995 struct dentry *dentry;
1996 struct inode *dir = parent->d_inode;
1997 struct inode *inode;
1998 struct btrfs_root *root = BTRFS_I(dir)->root;
1999 struct btrfs_root *dest = NULL;
2000 struct btrfs_ioctl_vol_args *vol_args;
2001 struct btrfs_trans_handle *trans;
2002 int namelen;
2003 int ret;
2004 int err = 0;
2005
76dda93c
YZ		 2006 vol_args = memdup_user(arg, sizeof(*vol_args));
2007 if (IS_ERR(vol_args))
2008 return PTR_ERR(vol_args);
2009
2010 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2011 namelen = strlen(vol_args->name);
2012 if (strchr(vol_args->name, '/') ||
2013 strncmp(vol_args->name, "..", namelen) == 0) {
2014 err = -EINVAL;
2015 goto out;
2016 }
2017
a561be71 2018 err = mnt_want_write_file(file);
76dda93c
YZ		 2019 if (err)
2020 goto out;
2021
2022 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
2023 dentry = lookup_one_len(vol_args->name, parent, namelen);
2024 if (IS_ERR(dentry)) {
2025 err = PTR_ERR(dentry);
2026 goto out_unlock_dir;
2027 }
2028
2029 if (!dentry->d_inode) {
2030 err = -ENOENT;
2031 goto out_dput;
2032 }
2033
2034 inode = dentry->d_inode;
4260f7c7
SW		 2035 dest = BTRFS_I(inode)->root;
2036 if (!capable(CAP_SYS_ADMIN)){
2037 /*
2038 * Regular user. Only allow this with a special mount
2039 * option, when the user has write+exec access to the
2040 * subvol root, and when rmdir(2) would have been
2041 * allowed.
2042 *
2043 * Note that this is _not_ check that the subvol is
2044 * empty or doesn't contain data that we wouldn't
2045 * otherwise be able to delete.
2046 *
2047 * Users who want to delete empty subvols should try
2048 * rmdir(2).
2049 */
2050 err = -EPERM;
2051 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2052 goto out_dput;
2053
2054 /*
2055 * Do not allow deletion if the parent dir is the same
2056 * as the dir to be deleted. That means the ioctl
2057 * must be called on the dentry referencing the root
2058 * of the subvol, not a random directory contained
2059 * within it.
2060 */
2061 err = -EINVAL;
2062 if (root == dest)
2063 goto out_dput;
2064
2065 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2066 if (err)
2067 goto out_dput;
2068
2069 /* check if subvolume may be deleted by a non-root user */
2070 err = btrfs_may_delete(dir, dentry, 1);
2071 if (err)
2072 goto out_dput;
2073 }
2074
33345d01 2075 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2076 err = -EINVAL;
2077 goto out_dput;
2078 }
2079
76dda93c
YZ		 2080 mutex_lock(&inode->i_mutex);
2081 err = d_invalidate(dentry);
2082 if (err)
2083 goto out_unlock;
2084
2085 down_write(&root->fs_info->subvol_sem);
2086
2087 err = may_destroy_subvol(dest);
2088 if (err)
2089 goto out_up_write;
2090
a22285a6
YZ		 2091 trans = btrfs_start_transaction(root, 0);
2092 if (IS_ERR(trans)) {
2093 err = PTR_ERR(trans);
d327099a 2094 goto out_up_write;
a22285a6
YZ		 2095 }
2096 trans->block_rsv = &root->fs_info->global_block_rsv;
2097
76dda93c
YZ		 2098 ret = btrfs_unlink_subvol(trans, root, dir,
2099 dest->root_key.objectid,
2100 dentry->d_name.name,
2101 dentry->d_name.len);
79787eaa
JM		 2102 if (ret) {
2103 err = ret;
2104 btrfs_abort_transaction(trans, root, ret);
2105 goto out_end_trans;
2106 }
76dda93c
YZ		 2107
2108 btrfs_record_root_in_trans(trans, dest);
2109
2110 memset(&dest->root_item.drop_progress, 0,
2111 sizeof(dest->root_item.drop_progress));
2112 dest->root_item.drop_level = 0;
2113 btrfs_set_root_refs(&dest->root_item, 0);
2114
d68fc57b
YZ		 2115 if (!xchg(&dest->orphan_item_inserted, 1)) {
2116 ret = btrfs_insert_orphan_item(trans,
2117 root->fs_info->tree_root,
2118 dest->root_key.objectid);
79787eaa
JM		 2119 if (ret) {
2120 btrfs_abort_transaction(trans, root, ret);
2121 err = ret;
2122 goto out_end_trans;
2123 }
d68fc57b 2124 }
79787eaa 2125out_end_trans:
531cb13f 2126 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2127 if (ret && !err)
2128 err = ret;
76dda93c
YZ		 2129 inode->i_flags |= S_DEAD;
2130out_up_write:
2131 up_write(&root->fs_info->subvol_sem);
2132out_unlock:
2133 mutex_unlock(&inode->i_mutex);
2134 if (!err) {
efefb143 2135 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2136 btrfs_invalidate_inodes(dest);
2137 d_delete(dentry);
2138 }
2139out_dput:
2140 dput(dentry);
2141out_unlock_dir:
2142 mutex_unlock(&dir->i_mutex);
2a79f17e 2143 mnt_drop_write_file(file);
76dda93c
YZ		 2144out:
2145 kfree(vol_args);
2146 return err;
2147}
2148
1e701a32 2149static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66
CH		 2150{
2151 struct inode *inode = fdentry(file)->d_inode;
2152 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2153 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2154 int ret;
2155
b83cc969
LZ		 2156 if (btrfs_root_readonly(root))
2157 return -EROFS;
2158
a561be71 2159 ret = mnt_want_write_file(file);
c146afad
YZ		 2160 if (ret)
2161 return ret;
f46b5a66
CH		 2162
2163 switch (inode->i_mode & S_IFMT) {
2164 case S_IFDIR:
e441d54d
CM		 2165 if (!capable(CAP_SYS_ADMIN)) {
2166 ret = -EPERM;
2167 goto out;
2168 }
8929ecfa
YZ		 2169 ret = btrfs_defrag_root(root, 0);
2170 if (ret)
2171 goto out;
2172 ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
f46b5a66
CH		 2173 break;
2174 case S_IFREG:
e441d54d
CM		 2175 if (!(file->f_mode & FMODE_WRITE)) {
2176 ret = -EINVAL;
2177 goto out;
2178 }
1e701a32
CM		 2179
2180 range = kzalloc(sizeof(*range), GFP_KERNEL);
2181 if (!range) {
2182 ret = -ENOMEM;
2183 goto out;
2184 }
2185
2186 if (argp) {
2187 if (copy_from_user(range, argp,
2188 sizeof(*range))) {
2189 ret = -EFAULT;
2190 kfree(range);
683be16e 2191 goto out;
1e701a32
CM		 2192 }
2193 /* compression requires us to start the IO */
2194 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2195 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2196 range->extent_thresh = (u32)-1;
2197 }
2198 } else {
2199 /* the rest are all set to zero by kzalloc */
2200 range->len = (u64)-1;
2201 }
4cb5300b
CM		 2202 ret = btrfs_defrag_file(fdentry(file)->d_inode, file,
2203 range, 0, 0);
2204 if (ret > 0)
2205 ret = 0;
1e701a32 2206 kfree(range);
f46b5a66 2207 break;
8929ecfa
YZ		 2208 default:
2209 ret = -EINVAL;
f46b5a66 2210 }
e441d54d 2211out:
2a79f17e 2212 mnt_drop_write_file(file);
e441d54d 2213 return ret;
f46b5a66
CH		 2214}
2215
b2950863 2216static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2217{
2218 struct btrfs_ioctl_vol_args *vol_args;
2219 int ret;
2220
e441d54d
CM		 2221 if (!capable(CAP_SYS_ADMIN))
2222 return -EPERM;
2223
c9e9f97b
ID		 2224 mutex_lock(&root->fs_info->volume_mutex);
2225 if (root->fs_info->balance_ctl) {
2226 printk(KERN_INFO "btrfs: balance in progress\n");
2227 ret = -EINVAL;
2228 goto out;
2229 }
2230
dae7b665 2231 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2232 if (IS_ERR(vol_args)) {
2233 ret = PTR_ERR(vol_args);
2234 goto out;
2235 }
f46b5a66 2236
5516e595 2237 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2238 ret = btrfs_init_new_device(root, vol_args->name);
2239
f46b5a66 2240 kfree(vol_args);
c9e9f97b
ID		 2241out:
2242 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 2243 return ret;
2244}
2245
b2950863 2246static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2247{
2248 struct btrfs_ioctl_vol_args *vol_args;
2249 int ret;
2250
e441d54d
CM		 2251 if (!capable(CAP_SYS_ADMIN))
2252 return -EPERM;
2253
c146afad
YZ		 2254 if (root->fs_info->sb->s_flags & MS_RDONLY)
2255 return -EROFS;
2256
c9e9f97b
ID		 2257 mutex_lock(&root->fs_info->volume_mutex);
2258 if (root->fs_info->balance_ctl) {
2259 printk(KERN_INFO "btrfs: balance in progress\n");
2260 ret = -EINVAL;
2261 goto out;
2262 }
2263
dae7b665 2264 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2265 if (IS_ERR(vol_args)) {
2266 ret = PTR_ERR(vol_args);
2267 goto out;
2268 }
f46b5a66 2269
5516e595 2270 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2271 ret = btrfs_rm_device(root, vol_args->name);
2272
f46b5a66 2273 kfree(vol_args);
c9e9f97b
ID		 2274out:
2275 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 2276 return ret;
2277}
2278
475f6387
JS		 2279static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2280{
027ed2f0 2281 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2282 struct btrfs_device *device;
2283 struct btrfs_device *next;
2284 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2285 int ret = 0;
475f6387
JS		 2286
2287 if (!capable(CAP_SYS_ADMIN))
2288 return -EPERM;
2289
027ed2f0
LZ		 2290 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2291 if (!fi_args)
2292 return -ENOMEM;
2293
2294 fi_args->num_devices = fs_devices->num_devices;
2295 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387
JS		 2296
2297 mutex_lock(&fs_devices->device_list_mutex);
2298 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2299 if (device->devid > fi_args->max_id)
2300 fi_args->max_id = device->devid;
475f6387
JS		 2301 }
2302 mutex_unlock(&fs_devices->device_list_mutex);
2303
027ed2f0
LZ		 2304 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2305 ret = -EFAULT;
475f6387 2306
027ed2f0
LZ		 2307 kfree(fi_args);
2308 return ret;
475f6387
JS		 2309}
2310
2311static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2312{
2313 struct btrfs_ioctl_dev_info_args *di_args;
2314 struct btrfs_device *dev;
2315 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2316 int ret = 0;
2317 char *s_uuid = NULL;
2318 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2319
2320 if (!capable(CAP_SYS_ADMIN))
2321 return -EPERM;
2322
2323 di_args = memdup_user(arg, sizeof(*di_args));
2324 if (IS_ERR(di_args))
2325 return PTR_ERR(di_args);
2326
2327 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2328 s_uuid = di_args->uuid;
2329
2330 mutex_lock(&fs_devices->device_list_mutex);
2331 dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL);
2332 mutex_unlock(&fs_devices->device_list_mutex);
2333
2334 if (!dev) {
2335 ret = -ENODEV;
2336 goto out;
2337 }
2338
2339 di_args->devid = dev->devid;
2340 di_args->bytes_used = dev->bytes_used;
2341 di_args->total_bytes = dev->total_bytes;
2342 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2343 if (dev->name) {
606686ee
JB		 2344 struct rcu_string *name;
2345
2346 rcu_read_lock();
2347 name = rcu_dereference(dev->name);
2348 strncpy(di_args->path, name->str, sizeof(di_args->path));
2349 rcu_read_unlock();
a27202fb
JM		 2350 di_args->path[sizeof(di_args->path) - 1] = 0;
2351 } else {
99ba55ad 2352 di_args->path[0] = '\0';
a27202fb 2353 }
475f6387
JS		 2354
2355out:
2356 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2357 ret = -EFAULT;
2358
2359 kfree(di_args);
2360 return ret;
2361}
2362
76dda93c
YZ		 2363static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2364 u64 off, u64 olen, u64 destoff)
f46b5a66
CH		 2365{
2366 struct inode *inode = fdentry(file)->d_inode;
2367 struct btrfs_root *root = BTRFS_I(inode)->root;
2903ff01 2368 struct fd src_file;
f46b5a66
CH		 2369 struct inode *src;
2370 struct btrfs_trans_handle *trans;
f46b5a66 2371 struct btrfs_path *path;
f46b5a66 2372 struct extent_buffer *leaf;
ae01a0ab
YZ		 2373 char *buf;
2374 struct btrfs_key key;
f46b5a66
CH		 2375 u32 nritems;
2376 int slot;
ae01a0ab 2377 int ret;
c5c9cd4d
SW		 2378 u64 len = olen;
2379 u64 bs = root->fs_info->sb->s_blocksize;
d20f7043 2380
c5c9cd4d
SW		 2381 /*
2382 * TODO:
2383 * - split compressed inline extents. annoying: we need to
2384 * decompress into destination's address_space (the file offset
2385 * may change, so source mapping won't do), then recompress (or
2386 * otherwise reinsert) a subrange.
2387 * - allow ranges within the same file to be cloned (provided
2388 * they don't overlap)?
2389 */
2390
e441d54d 2391 /* the destination must be opened for writing */
2ebc3464 2392 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
e441d54d
CM		 2393 return -EINVAL;
2394
b83cc969
LZ		 2395 if (btrfs_root_readonly(root))
2396 return -EROFS;
2397
a561be71 2398 ret = mnt_want_write_file(file);
c146afad
YZ		 2399 if (ret)
2400 return ret;
2401
2903ff01
AV		 2402 src_file = fdget(srcfd);
2403 if (!src_file.file) {
ab67b7c1
YZ		 2404 ret = -EBADF;
2405 goto out_drop_write;
2406 }
5dc64164 2407
362a20c5 2408 ret = -EXDEV;
2903ff01 2409 if (src_file.file->f_path.mnt != file->f_path.mnt)
362a20c5
DS		 2410 goto out_fput;
2411
2903ff01 2412 src = src_file.file->f_dentry->d_inode;
f46b5a66 2413
c5c9cd4d
SW		 2414 ret = -EINVAL;
2415 if (src == inode)
2416 goto out_fput;
2417
5dc64164 2418 /* the src must be open for reading */
2903ff01 2419 if (!(src_file.file->f_mode & FMODE_READ))
5dc64164
DR		 2420 goto out_fput;
2421
0e7b824c
LZ		 2422 /* don't make the dst file partly checksummed */
2423 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2424 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2425 goto out_fput;
2426
ae01a0ab
YZ		 2427 ret = -EISDIR;
2428 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2429 goto out_fput;
2430
f46b5a66 2431 ret = -EXDEV;
362a20c5 2432 if (src->i_sb != inode->i_sb)
ae01a0ab
YZ		 2433 goto out_fput;
2434
2435 ret = -ENOMEM;
2436 buf = vmalloc(btrfs_level_size(root, 0));
2437 if (!buf)
2438 goto out_fput;
2439
2440 path = btrfs_alloc_path();
2441 if (!path) {
2442 vfree(buf);
f46b5a66 2443 goto out_fput;
ae01a0ab
YZ		 2444 }
2445 path->reada = 2;
f46b5a66
CH		 2446
2447 if (inode < src) {
fccdae43
SW		 2448 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2449 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
f46b5a66 2450 } else {
fccdae43
SW		 2451 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2452 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
f46b5a66
CH		 2453 }
2454
c5c9cd4d
SW		 2455 /* determine range to clone */
2456 ret = -EINVAL;
2ebc3464 2457 if (off + len > src->i_size || off + len < off)
f46b5a66 2458 goto out_unlock;
c5c9cd4d
SW		 2459 if (len == 0)
2460 olen = len = src->i_size - off;
2461 /* if we extend to eof, continue to block boundary */
2462 if (off + len == src->i_size)
2a6b8dae 2463 len = ALIGN(src->i_size, bs) - off;
c5c9cd4d
SW		 2464
2465 /* verify the end result is block aligned */
2a6b8dae
LZ		 2466 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2467 !IS_ALIGNED(destoff, bs))
c5c9cd4d
SW		 2468 goto out_unlock;
2469
d525e8ab
LZ		 2470 if (destoff > inode->i_size) {
2471 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2472 if (ret)
2473 goto out_unlock;
2474 }
2475
71ef0786
LZ		 2476 /* truncate page cache pages from target inode range */
2477 truncate_inode_pages_range(&inode->i_data, destoff,
2478 PAGE_CACHE_ALIGN(destoff + len) - 1);
2479
f46b5a66
CH		 2480 /* do any pending delalloc/csum calc on src, one way or
2481 another, and lock file content */
2482 while (1) {
31840ae1 2483 struct btrfs_ordered_extent *ordered;
aa42ffd9
LB		 2484 lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2485 ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
9a019196 2486 if (!ordered &&
aa42ffd9
LB		 2487 !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
2488 EXTENT_DELALLOC, 0, NULL))
f46b5a66 2489 break;
aa42ffd9 2490 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
ae01a0ab
YZ		 2491 if (ordered)
2492 btrfs_put_ordered_extent(ordered);
9a019196 2493 btrfs_wait_ordered_range(src, off, len);
f46b5a66
CH		 2494 }
2495
c5c9cd4d 2496 /* clone data */
33345d01 2497 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2498 key.type = BTRFS_EXTENT_DATA_KEY;
2499 key.offset = 0;
f46b5a66
CH		 2500
2501 while (1) {
2502 /*
2503 * note the key will change type as we walk through the
2504 * tree.
2505 */
362a20c5
DS		 2506 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2507 0, 0);
f46b5a66
CH		 2508 if (ret < 0)
2509 goto out;
2510
ae01a0ab
YZ		 2511 nritems = btrfs_header_nritems(path->nodes[0]);
2512 if (path->slots[0] >= nritems) {
362a20c5 2513 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2514 if (ret < 0)
2515 goto out;
2516 if (ret > 0)
2517 break;
ae01a0ab 2518 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2519 }
2520 leaf = path->nodes[0];
2521 slot = path->slots[0];
f46b5a66 2522
ae01a0ab 2523 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 2524 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 2525 key.objectid != btrfs_ino(src))
f46b5a66
CH		 2526 break;
2527
c5c9cd4d
SW		 2528 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2529 struct btrfs_file_extent_item *extent;
2530 int type;
31840ae1
ZY		 2531 u32 size;
2532 struct btrfs_key new_key;
c5c9cd4d
SW		 2533 u64 disko = 0, diskl = 0;
2534 u64 datao = 0, datal = 0;
2535 u8 comp;
b5384d48 2536 u64 endoff;
31840ae1
ZY		 2537
2538 size = btrfs_item_size_nr(leaf, slot);
2539 read_extent_buffer(leaf, buf,
2540 btrfs_item_ptr_offset(leaf, slot),
2541 size);
c5c9cd4d
SW		 2542
2543 extent = btrfs_item_ptr(leaf, slot,
2544 struct btrfs_file_extent_item);
2545 comp = btrfs_file_extent_compression(leaf, extent);
2546 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 2547 if (type == BTRFS_FILE_EXTENT_REG ||
2548 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 2549 disko = btrfs_file_extent_disk_bytenr(leaf,
2550 extent);
2551 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2552 extent);
c5c9cd4d 2553 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 2554 datal = btrfs_file_extent_num_bytes(leaf,
2555 extent);
c5c9cd4d
SW		 2556 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2557 /* take upper bound, may be compressed */
2558 datal = btrfs_file_extent_ram_bytes(leaf,
2559 extent);
2560 }
b3b4aa74 2561 btrfs_release_path(path);
31840ae1 2562
050006a7 2563 if (key.offset + datal <= off ||
aa42ffd9 2564 key.offset >= off + len - 1)
c5c9cd4d
SW		 2565 goto next;
2566
31840ae1 2567 memcpy(&new_key, &key, sizeof(new_key));
33345d01 2568 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 2569 if (off <= key.offset)
2570 new_key.offset = key.offset + destoff - off;
2571 else
2572 new_key.offset = destoff;
31840ae1 2573
b6f3409b
SW		 2574 /*
2575 * 1 - adjusting old extent (we may have to split it)
2576 * 1 - add new extent
2577 * 1 - inode update
2578 */
2579 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 2580 if (IS_ERR(trans)) {
2581 ret = PTR_ERR(trans);
2582 goto out;
2583 }
2584
c8a894d7
CM		 2585 if (type == BTRFS_FILE_EXTENT_REG ||
2586 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 2587 /*
2588 * a | --- range to clone ---| b
2589 * | ------------- extent ------------- |
2590 */
2591
2592 /* substract range b */
2593 if (key.offset + datal > off + len)
2594 datal = off + len - key.offset;
2595
2596 /* substract range a */
a22285a6
YZ		 2597 if (off > key.offset) {
2598 datao += off - key.offset;
2599 datal -= off - key.offset;
2600 }
2601
5dc562c5 2602 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2603 new_key.offset,
2604 new_key.offset + datal,
2671485d 2605 1);
79787eaa
JM		 2606 if (ret) {
2607 btrfs_abort_transaction(trans, root,
2608 ret);
2609 btrfs_end_transaction(trans, root);
2610 goto out;
2611 }
a22285a6 2612
c5c9cd4d
SW		 2613 ret = btrfs_insert_empty_item(trans, root, path,
2614 &new_key, size);
79787eaa
JM		 2615 if (ret) {
2616 btrfs_abort_transaction(trans, root,
2617 ret);
2618 btrfs_end_transaction(trans, root);
2619 goto out;
2620 }
c5c9cd4d
SW		 2621
2622 leaf = path->nodes[0];
2623 slot = path->slots[0];
2624 write_extent_buffer(leaf, buf,
31840ae1
ZY		 2625 btrfs_item_ptr_offset(leaf, slot),
2626 size);
ae01a0ab 2627
c5c9cd4d 2628 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 2629 struct btrfs_file_extent_item);
c5c9cd4d 2630
c5c9cd4d
SW		 2631 /* disko == 0 means it's a hole */
2632 if (!disko)
2633 datao = 0;
c5c9cd4d
SW		 2634
2635 btrfs_set_file_extent_offset(leaf, extent,
2636 datao);
2637 btrfs_set_file_extent_num_bytes(leaf, extent,
2638 datal);
2639 if (disko) {
2640 inode_add_bytes(inode, datal);
ae01a0ab 2641 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 2642 disko, diskl, 0,
2643 root->root_key.objectid,
33345d01 2644 btrfs_ino(inode),
66d7e7f0
AJ		 2645 new_key.offset - datao,
2646 0);
79787eaa
JM		 2647 if (ret) {
2648 btrfs_abort_transaction(trans,
2649 root,
2650 ret);
2651 btrfs_end_transaction(trans,
2652 root);
2653 goto out;
2654
2655 }
f46b5a66 2656 }
c5c9cd4d
SW		 2657 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2658 u64 skip = 0;
2659 u64 trim = 0;
2660 if (off > key.offset) {
2661 skip = off - key.offset;
2662 new_key.offset += skip;
2663 }
d397712b 2664
aa42ffd9
LB		 2665 if (key.offset + datal > off + len)
2666 trim = key.offset + datal - (off + len);
d397712b 2667
c5c9cd4d 2668 if (comp && (skip || trim)) {
c5c9cd4d 2669 ret = -EINVAL;
a22285a6 2670 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 2671 goto out;
2672 }
2673 size -= skip + trim;
2674 datal -= skip + trim;
a22285a6 2675
5dc562c5 2676 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2677 new_key.offset,
2678 new_key.offset + datal,
2671485d 2679 1);
79787eaa
JM		 2680 if (ret) {
2681 btrfs_abort_transaction(trans, root,
2682 ret);
2683 btrfs_end_transaction(trans, root);
2684 goto out;
2685 }
a22285a6 2686
c5c9cd4d
SW		 2687 ret = btrfs_insert_empty_item(trans, root, path,
2688 &new_key, size);
79787eaa
JM		 2689 if (ret) {
2690 btrfs_abort_transaction(trans, root,
2691 ret);
2692 btrfs_end_transaction(trans, root);
2693 goto out;
2694 }
c5c9cd4d
SW		 2695
2696 if (skip) {
d397712b
CM		 2697 u32 start =
2698 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 2699 memmove(buf+start, buf+start+skip,
2700 datal);
2701 }
2702
2703 leaf = path->nodes[0];
2704 slot = path->slots[0];
2705 write_extent_buffer(leaf, buf,
2706 btrfs_item_ptr_offset(leaf, slot),
2707 size);
2708 inode_add_bytes(inode, datal);
f46b5a66 2709 }
c5c9cd4d
SW		 2710
2711 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 2712 btrfs_release_path(path);
c5c9cd4d 2713
0c4d2d95 2714 inode_inc_iversion(inode);
a22285a6 2715 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 2716
2717 /*
2718 * we round up to the block size at eof when
2719 * determining which extents to clone above,
2720 * but shouldn't round up the file size
2721 */
2722 endoff = new_key.offset + datal;
5f3888ff
LZ		 2723 if (endoff > destoff+olen)
2724 endoff = destoff+olen;
b5384d48
SW		 2725 if (endoff > inode->i_size)
2726 btrfs_i_size_write(inode, endoff);
2727
a22285a6 2728 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 2729 if (ret) {
2730 btrfs_abort_transaction(trans, root, ret);
2731 btrfs_end_transaction(trans, root);
2732 goto out;
2733 }
2734 ret = btrfs_end_transaction(trans, root);
a22285a6 2735 }
d397712b 2736next:
b3b4aa74 2737 btrfs_release_path(path);
f46b5a66 2738 key.offset++;
f46b5a66 2739 }
f46b5a66
CH		 2740 ret = 0;
2741out:
b3b4aa74 2742 btrfs_release_path(path);
aa42ffd9 2743 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66
CH		 2744out_unlock:
2745 mutex_unlock(&src->i_mutex);
2746 mutex_unlock(&inode->i_mutex);
ae01a0ab
YZ		 2747 vfree(buf);
2748 btrfs_free_path(path);
f46b5a66 2749out_fput:
2903ff01 2750 fdput(src_file);
ab67b7c1 2751out_drop_write:
2a79f17e 2752 mnt_drop_write_file(file);
f46b5a66
CH		 2753 return ret;
2754}
2755
7a865e8a 2756static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 2757{
2758 struct btrfs_ioctl_clone_range_args args;
2759
7a865e8a 2760 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 2761 return -EFAULT;
2762 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2763 args.src_length, args.dest_offset);
2764}
2765
f46b5a66
CH		 2766/*
2767 * there are many ways the trans_start and trans_end ioctls can lead
2768 * to deadlocks. They should only be used by applications that
2769 * basically own the machine, and have a very in depth understanding
2770 * of all the possible deadlocks and enospc problems.
2771 */
b2950863 2772static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66
CH		 2773{
2774 struct inode *inode = fdentry(file)->d_inode;
2775 struct btrfs_root *root = BTRFS_I(inode)->root;
2776 struct btrfs_trans_handle *trans;
1ab86aed 2777 int ret;
f46b5a66 2778
1ab86aed 2779 ret = -EPERM;
df5b5520 2780 if (!capable(CAP_SYS_ADMIN))
1ab86aed 2781 goto out;
df5b5520 2782
1ab86aed
SW		 2783 ret = -EINPROGRESS;
2784 if (file->private_data)
f46b5a66 2785 goto out;
9ca9ee09 2786
b83cc969
LZ		 2787 ret = -EROFS;
2788 if (btrfs_root_readonly(root))
2789 goto out;
2790
a561be71 2791 ret = mnt_want_write_file(file);
c146afad
YZ		 2792 if (ret)
2793 goto out;
2794
a4abeea4 2795 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 2796
1ab86aed 2797 ret = -ENOMEM;
7a7eaa40 2798 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 2799 if (IS_ERR(trans))
1ab86aed
SW		 2800 goto out_drop;
2801
2802 file->private_data = trans;
2803 return 0;
2804
2805out_drop:
a4abeea4 2806 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 2807 mnt_drop_write_file(file);
f46b5a66 2808out:
f46b5a66
CH		 2809 return ret;
2810}
2811
6ef5ed0d
JB		 2812static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2813{
2814 struct inode *inode = fdentry(file)->d_inode;
2815 struct btrfs_root *root = BTRFS_I(inode)->root;
2816 struct btrfs_root *new_root;
2817 struct btrfs_dir_item *di;
2818 struct btrfs_trans_handle *trans;
2819 struct btrfs_path *path;
2820 struct btrfs_key location;
2821 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 2822 u64 objectid = 0;
2823 u64 dir_id;
2824
2825 if (!capable(CAP_SYS_ADMIN))
2826 return -EPERM;
2827
2828 if (copy_from_user(&objectid, argp, sizeof(objectid)))
2829 return -EFAULT;
2830
2831 if (!objectid)
2832 objectid = root->root_key.objectid;
2833
2834 location.objectid = objectid;
2835 location.type = BTRFS_ROOT_ITEM_KEY;
2836 location.offset = (u64)-1;
2837
2838 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
2839 if (IS_ERR(new_root))
2840 return PTR_ERR(new_root);
2841
2842 if (btrfs_root_refs(&new_root->root_item) == 0)
2843 return -ENOENT;
2844
2845 path = btrfs_alloc_path();
2846 if (!path)
2847 return -ENOMEM;
2848 path->leave_spinning = 1;
2849
2850 trans = btrfs_start_transaction(root, 1);
98d5dc13 2851 if (IS_ERR(trans)) {
6ef5ed0d 2852 btrfs_free_path(path);
98d5dc13 2853 return PTR_ERR(trans);
6ef5ed0d
JB		 2854 }
2855
6c41761f 2856 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 2857 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
2858 dir_id, "default", 7, 1);
cf1e99a4 2859 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 2860 btrfs_free_path(path);
2861 btrfs_end_transaction(trans, root);
2862 printk(KERN_ERR "Umm, you don't have the default dir item, "
2863 "this isn't going to work\n");
2864 return -ENOENT;
2865 }
2866
2867 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2868 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2869 btrfs_mark_buffer_dirty(path->nodes[0]);
2870 btrfs_free_path(path);
2871
2b0ce2c2 2872 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d
JB		 2873 btrfs_end_transaction(trans, root);
2874
2875 return 0;
2876}
2877
5af3e8cc
SB		 2878void btrfs_get_block_group_info(struct list_head *groups_list,
2879 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 2880{
2881 struct btrfs_block_group_cache *block_group;
2882
2883 space->total_bytes = 0;
2884 space->used_bytes = 0;
2885 space->flags = 0;
2886 list_for_each_entry(block_group, groups_list, list) {
2887 space->flags = block_group->flags;
2888 space->total_bytes += block_group->key.offset;
2889 space->used_bytes +=
2890 btrfs_block_group_used(&block_group->item);
2891 }
2892}
2893
1406e432
JB		 2894long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
2895{
2896 struct btrfs_ioctl_space_args space_args;
2897 struct btrfs_ioctl_space_info space;
2898 struct btrfs_ioctl_space_info *dest;
7fde62bf 2899 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 2900 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 2901 struct btrfs_space_info *info;
bf5fc093
JB		 2902 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
2903 BTRFS_BLOCK_GROUP_SYSTEM,
2904 BTRFS_BLOCK_GROUP_METADATA,
2905 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
2906 int num_types = 4;
7fde62bf 2907 int alloc_size;
1406e432 2908 int ret = 0;
51788b1b 2909 u64 slot_count = 0;
bf5fc093 2910 int i, c;
1406e432
JB		 2911
2912 if (copy_from_user(&space_args,
2913 (struct btrfs_ioctl_space_args __user *)arg,
2914 sizeof(space_args)))
2915 return -EFAULT;
2916
bf5fc093
JB		 2917 for (i = 0; i < num_types; i++) {
2918 struct btrfs_space_info *tmp;
2919
2920 info = NULL;
2921 rcu_read_lock();
2922 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2923 list) {
2924 if (tmp->flags == types[i]) {
2925 info = tmp;
2926 break;
2927 }
2928 }
2929 rcu_read_unlock();
2930
2931 if (!info)
2932 continue;
2933
2934 down_read(&info->groups_sem);
2935 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
2936 if (!list_empty(&info->block_groups[c]))
2937 slot_count++;
2938 }
2939 up_read(&info->groups_sem);
2940 }
7fde62bf
CM		 2941
2942 /* space_slots == 0 means they are asking for a count */
2943 if (space_args.space_slots == 0) {
2944 space_args.total_spaces = slot_count;
2945 goto out;
2946 }
bf5fc093 2947
51788b1b 2948 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 2949
7fde62bf 2950 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 2951
7fde62bf
CM		 2952 /* we generally have at most 6 or so space infos, one for each raid
2953 * level. So, a whole page should be more than enough for everyone
2954 */
2955 if (alloc_size > PAGE_CACHE_SIZE)
2956 return -ENOMEM;
2957
1406e432 2958 space_args.total_spaces = 0;
7fde62bf
CM		 2959 dest = kmalloc(alloc_size, GFP_NOFS);
2960 if (!dest)
2961 return -ENOMEM;
2962 dest_orig = dest;
1406e432 2963
7fde62bf 2964 /* now we have a buffer to copy into */
bf5fc093
JB		 2965 for (i = 0; i < num_types; i++) {
2966 struct btrfs_space_info *tmp;
2967
51788b1b
DR		 2968 if (!slot_count)
2969 break;
2970
bf5fc093
JB		 2971 info = NULL;
2972 rcu_read_lock();
2973 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2974 list) {
2975 if (tmp->flags == types[i]) {
2976 info = tmp;
2977 break;
2978 }
2979 }
2980 rcu_read_unlock();
7fde62bf 2981
bf5fc093
JB		 2982 if (!info)
2983 continue;
2984 down_read(&info->groups_sem);
2985 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
2986 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 2987 btrfs_get_block_group_info(
2988 &info->block_groups[c], &space);
bf5fc093
JB		 2989 memcpy(dest, &space, sizeof(space));
2990 dest++;
2991 space_args.total_spaces++;
51788b1b 2992 slot_count--;
bf5fc093 2993 }
51788b1b
DR		 2994 if (!slot_count)
2995 break;
bf5fc093
JB		 2996 }
2997 up_read(&info->groups_sem);
1406e432 2998 }
1406e432 2999
2eec6c81 3000 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3001 (arg + sizeof(struct btrfs_ioctl_space_args));
3002
3003 if (copy_to_user(user_dest, dest_orig, alloc_size))
3004 ret = -EFAULT;
3005
3006 kfree(dest_orig);
3007out:
3008 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3009 ret = -EFAULT;
3010
3011 return ret;
3012}
3013
f46b5a66
CH		 3014/*
3015 * there are many ways the trans_start and trans_end ioctls can lead
3016 * to deadlocks. They should only be used by applications that
3017 * basically own the machine, and have a very in depth understanding
3018 * of all the possible deadlocks and enospc problems.
3019 */
3020long btrfs_ioctl_trans_end(struct file *file)
3021{
3022 struct inode *inode = fdentry(file)->d_inode;
3023 struct btrfs_root *root = BTRFS_I(inode)->root;
3024 struct btrfs_trans_handle *trans;
f46b5a66 3025
f46b5a66 3026 trans = file->private_data;
1ab86aed
SW		 3027 if (!trans)
3028 return -EINVAL;
b214107e 3029 file->private_data = NULL;
9ca9ee09 3030
1ab86aed
SW		 3031 btrfs_end_transaction(trans, root);
3032
a4abeea4 3033 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3034
2a79f17e 3035 mnt_drop_write_file(file);
1ab86aed 3036 return 0;
f46b5a66
CH		 3037}
3038
46204592
SW		 3039static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp)
3040{
3041 struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
3042 struct btrfs_trans_handle *trans;
3043 u64 transid;
db5b493a 3044 int ret;
46204592
SW		 3045
3046 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 3047 if (IS_ERR(trans))
3048 return PTR_ERR(trans);
46204592 3049 transid = trans->transid;
db5b493a 3050 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3051 if (ret) {
3052 btrfs_end_transaction(trans, root);
db5b493a 3053 return ret;
8b2b2d3c 3054 }
46204592
SW		 3055
3056 if (argp)
3057 if (copy_to_user(argp, &transid, sizeof(transid)))
3058 return -EFAULT;
3059 return 0;
3060}
3061
3062static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
3063{
3064 struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
3065 u64 transid;
3066
3067 if (argp) {
3068 if (copy_from_user(&transid, argp, sizeof(transid)))
3069 return -EFAULT;
3070 } else {
3071 transid = 0; /* current trans */
3072 }
3073 return btrfs_wait_for_commit(root, transid);
3074}
3075
475f6387
JS		 3076static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
3077{
3078 int ret;
3079 struct btrfs_ioctl_scrub_args *sa;
3080
3081 if (!capable(CAP_SYS_ADMIN))
3082 return -EPERM;
3083
3084 sa = memdup_user(arg, sizeof(*sa));
3085 if (IS_ERR(sa))
3086 return PTR_ERR(sa);
3087
3088 ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end,
8628764e 3089 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);
475f6387
JS		 3090
3091 if (copy_to_user(arg, sa, sizeof(*sa)))
3092 ret = -EFAULT;
3093
3094 kfree(sa);
3095 return ret;
3096}
3097
3098static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3099{
3100 if (!capable(CAP_SYS_ADMIN))
3101 return -EPERM;
3102
3103 return btrfs_scrub_cancel(root);
3104}
3105
3106static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3107 void __user *arg)
3108{
3109 struct btrfs_ioctl_scrub_args *sa;
3110 int ret;
3111
3112 if (!capable(CAP_SYS_ADMIN))
3113 return -EPERM;
3114
3115 sa = memdup_user(arg, sizeof(*sa));
3116 if (IS_ERR(sa))
3117 return PTR_ERR(sa);
3118
3119 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3120
3121 if (copy_to_user(arg, sa, sizeof(*sa)))
3122 ret = -EFAULT;
3123
3124 kfree(sa);
3125 return ret;
3126}
3127
c11d2c23 3128static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3129 void __user *arg)
c11d2c23
SB		 3130{
3131 struct btrfs_ioctl_get_dev_stats *sa;
3132 int ret;
3133
c11d2c23
SB		 3134 sa = memdup_user(arg, sizeof(*sa));
3135 if (IS_ERR(sa))
3136 return PTR_ERR(sa);
3137
b27f7c0c
DS		 3138 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3139 kfree(sa);
3140 return -EPERM;
3141 }
3142
3143 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3144
3145 if (copy_to_user(arg, sa, sizeof(*sa)))
3146 ret = -EFAULT;
3147
3148 kfree(sa);
3149 return ret;
3150}
3151
d7728c96
JS		 3152static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3153{
3154 int ret = 0;
3155 int i;
740c3d22 3156 u64 rel_ptr;
d7728c96 3157 int size;
806468f8 3158 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3159 struct inode_fs_paths *ipath = NULL;
3160 struct btrfs_path *path;
3161
3162 if (!capable(CAP_SYS_ADMIN))
3163 return -EPERM;
3164
3165 path = btrfs_alloc_path();
3166 if (!path) {
3167 ret = -ENOMEM;
3168 goto out;
3169 }
3170
3171 ipa = memdup_user(arg, sizeof(*ipa));
3172 if (IS_ERR(ipa)) {
3173 ret = PTR_ERR(ipa);
3174 ipa = NULL;
3175 goto out;
3176 }
3177
3178 size = min_t(u32, ipa->size, 4096);
3179 ipath = init_ipath(size, root, path);
3180 if (IS_ERR(ipath)) {
3181 ret = PTR_ERR(ipath);
3182 ipath = NULL;
3183 goto out;
3184 }
3185
3186 ret = paths_from_inode(ipa->inum, ipath);
3187 if (ret < 0)
3188 goto out;
3189
3190 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3191 rel_ptr = ipath->fspath->val[i] -
3192 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3193 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3194 }
3195
745c4d8e
JM		 3196 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3197 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3198 if (ret) {
3199 ret = -EFAULT;
3200 goto out;
3201 }
3202
3203out:
3204 btrfs_free_path(path);
3205 free_ipath(ipath);
3206 kfree(ipa);
3207
3208 return ret;
3209}
3210
3211static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3212{
3213 struct btrfs_data_container *inodes = ctx;
3214 const size_t c = 3 * sizeof(u64);
3215
3216 if (inodes->bytes_left >= c) {
3217 inodes->bytes_left -= c;
3218 inodes->val[inodes->elem_cnt] = inum;
3219 inodes->val[inodes->elem_cnt + 1] = offset;
3220 inodes->val[inodes->elem_cnt + 2] = root;
3221 inodes->elem_cnt += 3;
3222 } else {
3223 inodes->bytes_missing += c - inodes->bytes_left;
3224 inodes->bytes_left = 0;
3225 inodes->elem_missed += 3;
3226 }
3227
3228 return 0;
3229}
3230
3231static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3232 void __user *arg)
3233{
3234 int ret = 0;
3235 int size;
d7728c96
JS		 3236 struct btrfs_ioctl_logical_ino_args *loi;
3237 struct btrfs_data_container *inodes = NULL;
3238 struct btrfs_path *path = NULL;
d7728c96
JS		 3239
3240 if (!capable(CAP_SYS_ADMIN))
3241 return -EPERM;
3242
3243 loi = memdup_user(arg, sizeof(*loi));
3244 if (IS_ERR(loi)) {
3245 ret = PTR_ERR(loi);
3246 loi = NULL;
3247 goto out;
3248 }
3249
3250 path = btrfs_alloc_path();
3251 if (!path) {
3252 ret = -ENOMEM;
3253 goto out;
3254 }
3255
425d17a2 3256 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3257 inodes = init_data_container(size);
3258 if (IS_ERR(inodes)) {
3259 ret = PTR_ERR(inodes);
3260 inodes = NULL;
3261 goto out;
3262 }
3263
df031f07
LB		 3264 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3265 build_ino_list, inodes);
3266 if (ret == -EINVAL)
d7728c96
JS		 3267 ret = -ENOENT;
3268 if (ret < 0)
3269 goto out;
3270
745c4d8e
JM		 3271 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3272 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3273 if (ret)
3274 ret = -EFAULT;
3275
3276out:
3277 btrfs_free_path(path);
425d17a2 3278 vfree(inodes);
d7728c96
JS		 3279 kfree(loi);
3280
3281 return ret;
3282}
3283
19a39dce 3284void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3285 struct btrfs_ioctl_balance_args *bargs)
3286{
3287 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3288
3289 bargs->flags = bctl->flags;
3290
837d5b6e
ID		 3291 if (atomic_read(&fs_info->balance_running))
3292 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3293 if (atomic_read(&fs_info->balance_pause_req))
3294 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3295 if (atomic_read(&fs_info->balance_cancel_req))
3296 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3297
c9e9f97b
ID		 3298 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3299 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3300 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3301
3302 if (lock) {
3303 spin_lock(&fs_info->balance_lock);
3304 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3305 spin_unlock(&fs_info->balance_lock);
3306 } else {
3307 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3308 }
c9e9f97b
ID		 3309}
3310
9ba1f6e4 3311static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 3312{
9ba1f6e4 3313 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
c9e9f97b
ID		 3314 struct btrfs_fs_info *fs_info = root->fs_info;
3315 struct btrfs_ioctl_balance_args *bargs;
3316 struct btrfs_balance_control *bctl;
3317 int ret;
3318
3319 if (!capable(CAP_SYS_ADMIN))
3320 return -EPERM;
3321
e54bfa31 3322 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 3323 if (ret)
3324 return ret;
3325
c9e9f97b
ID		 3326 mutex_lock(&fs_info->volume_mutex);
3327 mutex_lock(&fs_info->balance_mutex);
3328
3329 if (arg) {
3330 bargs = memdup_user(arg, sizeof(*bargs));
3331 if (IS_ERR(bargs)) {
3332 ret = PTR_ERR(bargs);
3333 goto out;
3334 }
de322263
ID		 3335
3336 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3337 if (!fs_info->balance_ctl) {
3338 ret = -ENOTCONN;
3339 goto out_bargs;
3340 }
3341
3342 bctl = fs_info->balance_ctl;
3343 spin_lock(&fs_info->balance_lock);
3344 bctl->flags |= BTRFS_BALANCE_RESUME;
3345 spin_unlock(&fs_info->balance_lock);
3346
3347 goto do_balance;
3348 }
c9e9f97b
ID		 3349 } else {
3350 bargs = NULL;
3351 }
3352
837d5b6e
ID		 3353 if (fs_info->balance_ctl) {
3354 ret = -EINPROGRESS;
3355 goto out_bargs;
3356 }
3357
c9e9f97b
ID		 3358 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3359 if (!bctl) {
3360 ret = -ENOMEM;
3361 goto out_bargs;
3362 }
3363
3364 bctl->fs_info = fs_info;
3365 if (arg) {
3366 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3367 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3368 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3369
3370 bctl->flags = bargs->flags;
f43ffb60
ID		 3371 } else {
3372 /* balance everything - no filters */
3373 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 3374 }
3375
de322263 3376do_balance:
c9e9f97b
ID		 3377 ret = btrfs_balance(bctl, bargs);
3378 /*
837d5b6e
ID		 3379 * bctl is freed in __cancel_balance or in free_fs_info if
3380 * restriper was paused all the way until unmount
c9e9f97b
ID		 3381 */
3382 if (arg) {
3383 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3384 ret = -EFAULT;
3385 }
3386
3387out_bargs:
3388 kfree(bargs);
3389out:
3390 mutex_unlock(&fs_info->balance_mutex);
3391 mutex_unlock(&fs_info->volume_mutex);
e54bfa31 3392 mnt_drop_write_file(file);
c9e9f97b
ID		 3393 return ret;
3394}
3395
837d5b6e
ID		 3396static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3397{
3398 if (!capable(CAP_SYS_ADMIN))
3399 return -EPERM;
3400
3401 switch (cmd) {
3402 case BTRFS_BALANCE_CTL_PAUSE:
3403 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 3404 case BTRFS_BALANCE_CTL_CANCEL:
3405 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 3406 }
3407
3408 return -EINVAL;
3409}
3410
19a39dce
ID		 3411static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3412 void __user *arg)
3413{
3414 struct btrfs_fs_info *fs_info = root->fs_info;
3415 struct btrfs_ioctl_balance_args *bargs;
3416 int ret = 0;
3417
3418 if (!capable(CAP_SYS_ADMIN))
3419 return -EPERM;
3420
3421 mutex_lock(&fs_info->balance_mutex);
3422 if (!fs_info->balance_ctl) {
3423 ret = -ENOTCONN;
3424 goto out;
3425 }
3426
3427 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3428 if (!bargs) {
3429 ret = -ENOMEM;
3430 goto out;
3431 }
3432
3433 update_ioctl_balance_args(fs_info, 1, bargs);
3434
3435 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3436 ret = -EFAULT;
3437
3438 kfree(bargs);
3439out:
3440 mutex_unlock(&fs_info->balance_mutex);
3441 return ret;
3442}
3443
5d13a37b
AJ		 3444static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg)
3445{
3446 struct btrfs_ioctl_quota_ctl_args *sa;
3447 struct btrfs_trans_handle *trans = NULL;
3448 int ret;
3449 int err;
3450
3451 if (!capable(CAP_SYS_ADMIN))
3452 return -EPERM;
3453
3454 if (root->fs_info->sb->s_flags & MS_RDONLY)
3455 return -EROFS;
3456
3457 sa = memdup_user(arg, sizeof(*sa));
3458 if (IS_ERR(sa))
3459 return PTR_ERR(sa);
3460
3461 if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
3462 trans = btrfs_start_transaction(root, 2);
3463 if (IS_ERR(trans)) {
3464 ret = PTR_ERR(trans);
3465 goto out;
3466 }
3467 }
3468
3469 switch (sa->cmd) {
3470 case BTRFS_QUOTA_CTL_ENABLE:
3471 ret = btrfs_quota_enable(trans, root->fs_info);
3472 break;
3473 case BTRFS_QUOTA_CTL_DISABLE:
3474 ret = btrfs_quota_disable(trans, root->fs_info);
3475 break;
3476 case BTRFS_QUOTA_CTL_RESCAN:
3477 ret = btrfs_quota_rescan(root->fs_info);
3478 break;
3479 default:
3480 ret = -EINVAL;
3481 break;
3482 }
3483
3484 if (copy_to_user(arg, sa, sizeof(*sa)))
3485 ret = -EFAULT;
3486
3487 if (trans) {
3488 err = btrfs_commit_transaction(trans, root);
3489 if (err && !ret)
3490 ret = err;
3491 }
3492
3493out:
3494 kfree(sa);
3495 return ret;
3496}
3497
3498static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg)
3499{
3500 struct btrfs_ioctl_qgroup_assign_args *sa;
3501 struct btrfs_trans_handle *trans;
3502 int ret;
3503 int err;
3504
3505 if (!capable(CAP_SYS_ADMIN))
3506 return -EPERM;
3507
3508 if (root->fs_info->sb->s_flags & MS_RDONLY)
3509 return -EROFS;
3510
3511 sa = memdup_user(arg, sizeof(*sa));
3512 if (IS_ERR(sa))
3513 return PTR_ERR(sa);
3514
3515 trans = btrfs_join_transaction(root);
3516 if (IS_ERR(trans)) {
3517 ret = PTR_ERR(trans);
3518 goto out;
3519 }
3520
3521 /* FIXME: check if the IDs really exist */
3522 if (sa->assign) {
3523 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3524 sa->src, sa->dst);
3525 } else {
3526 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3527 sa->src, sa->dst);
3528 }
3529
3530 err = btrfs_end_transaction(trans, root);
3531 if (err && !ret)
3532 ret = err;
3533
3534out:
3535 kfree(sa);
3536 return ret;
3537}
3538
3539static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg)
3540{
3541 struct btrfs_ioctl_qgroup_create_args *sa;
3542 struct btrfs_trans_handle *trans;
3543 int ret;
3544 int err;
3545
3546 if (!capable(CAP_SYS_ADMIN))
3547 return -EPERM;
3548
3549 if (root->fs_info->sb->s_flags & MS_RDONLY)
3550 return -EROFS;
3551
3552 sa = memdup_user(arg, sizeof(*sa));
3553 if (IS_ERR(sa))
3554 return PTR_ERR(sa);
3555
3556 trans = btrfs_join_transaction(root);
3557 if (IS_ERR(trans)) {
3558 ret = PTR_ERR(trans);
3559 goto out;
3560 }
3561
3562 /* FIXME: check if the IDs really exist */
3563 if (sa->create) {
3564 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3565 NULL);
3566 } else {
3567 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3568 }
3569
3570 err = btrfs_end_transaction(trans, root);
3571 if (err && !ret)
3572 ret = err;
3573
3574out:
3575 kfree(sa);
3576 return ret;
3577}
3578
3579static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg)
3580{
3581 struct btrfs_ioctl_qgroup_limit_args *sa;
3582 struct btrfs_trans_handle *trans;
3583 int ret;
3584 int err;
3585 u64 qgroupid;
3586
3587 if (!capable(CAP_SYS_ADMIN))
3588 return -EPERM;
3589
3590 if (root->fs_info->sb->s_flags & MS_RDONLY)
3591 return -EROFS;
3592
3593 sa = memdup_user(arg, sizeof(*sa));
3594 if (IS_ERR(sa))
3595 return PTR_ERR(sa);
3596
3597 trans = btrfs_join_transaction(root);
3598 if (IS_ERR(trans)) {
3599 ret = PTR_ERR(trans);
3600 goto out;
3601 }
3602
3603 qgroupid = sa->qgroupid;
3604 if (!qgroupid) {
3605 /* take the current subvol as qgroup */
3606 qgroupid = root->root_key.objectid;
3607 }
3608
3609 /* FIXME: check if the IDs really exist */
3610 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3611
3612 err = btrfs_end_transaction(trans, root);
3613 if (err && !ret)
3614 ret = err;
3615
3616out:
3617 kfree(sa);
3618 return ret;
3619}
3620
8ea05e3a
AB		 3621static long btrfs_ioctl_set_received_subvol(struct file *file,
3622 void __user *arg)
3623{
3624 struct btrfs_ioctl_received_subvol_args *sa = NULL;
3625 struct inode *inode = fdentry(file)->d_inode;
3626 struct btrfs_root *root = BTRFS_I(inode)->root;
3627 struct btrfs_root_item *root_item = &root->root_item;
3628 struct btrfs_trans_handle *trans;
3629 struct timespec ct = CURRENT_TIME;
3630 int ret = 0;
3631
3632 ret = mnt_want_write_file(file);
3633 if (ret < 0)
3634 return ret;
3635
3636 down_write(&root->fs_info->subvol_sem);
3637
3638 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
3639 ret = -EINVAL;
3640 goto out;
3641 }
3642
3643 if (btrfs_root_readonly(root)) {
3644 ret = -EROFS;
3645 goto out;
3646 }
3647
3648 if (!inode_owner_or_capable(inode)) {
3649 ret = -EACCES;
3650 goto out;
3651 }
3652
3653 sa = memdup_user(arg, sizeof(*sa));
3654 if (IS_ERR(sa)) {
3655 ret = PTR_ERR(sa);
3656 sa = NULL;
3657 goto out;
3658 }
3659
3660 trans = btrfs_start_transaction(root, 1);
3661 if (IS_ERR(trans)) {
3662 ret = PTR_ERR(trans);
3663 trans = NULL;
3664 goto out;
3665 }
3666
3667 sa->rtransid = trans->transid;
3668 sa->rtime.sec = ct.tv_sec;
3669 sa->rtime.nsec = ct.tv_nsec;
3670
3671 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
3672 btrfs_set_root_stransid(root_item, sa->stransid);
3673 btrfs_set_root_rtransid(root_item, sa->rtransid);
3674 root_item->stime.sec = cpu_to_le64(sa->stime.sec);
3675 root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
3676 root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
3677 root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
3678
3679 ret = btrfs_update_root(trans, root->fs_info->tree_root,
3680 &root->root_key, &root->root_item);
3681 if (ret < 0) {
3682 btrfs_end_transaction(trans, root);
3683 trans = NULL;
3684 goto out;
3685 } else {
3686 ret = btrfs_commit_transaction(trans, root);
3687 if (ret < 0)
3688 goto out;
3689 }
3690
3691 ret = copy_to_user(arg, sa, sizeof(*sa));
3692 if (ret)
3693 ret = -EFAULT;
3694
3695out:
3696 kfree(sa);
3697 up_write(&root->fs_info->subvol_sem);
3698 mnt_drop_write_file(file);
3699 return ret;
3700}
3701
f46b5a66
CH		 3702long btrfs_ioctl(struct file *file, unsigned int
3703 cmd, unsigned long arg)
3704{
3705 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
4bcabaa3 3706 void __user *argp = (void __user *)arg;
f46b5a66
CH		 3707
3708 switch (cmd) {
6cbff00f
CH		 3709 case FS_IOC_GETFLAGS:
3710 return btrfs_ioctl_getflags(file, argp);
3711 case FS_IOC_SETFLAGS:
3712 return btrfs_ioctl_setflags(file, argp);
3713 case FS_IOC_GETVERSION:
3714 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 3715 case FITRIM:
3716 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 3717 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 3718 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 3719 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 3720 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 3721 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 3722 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 3723 case BTRFS_IOC_SUBVOL_CREATE_V2:
3724 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 3725 case BTRFS_IOC_SNAP_DESTROY:
3726 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 3727 case BTRFS_IOC_SUBVOL_GETFLAGS:
3728 return btrfs_ioctl_subvol_getflags(file, argp);
3729 case BTRFS_IOC_SUBVOL_SETFLAGS:
3730 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 3731 case BTRFS_IOC_DEFAULT_SUBVOL:
3732 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 3733 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 3734 return btrfs_ioctl_defrag(file, NULL);
3735 case BTRFS_IOC_DEFRAG_RANGE:
3736 return btrfs_ioctl_defrag(file, argp);
f46b5a66 3737 case BTRFS_IOC_RESIZE:
4bcabaa3 3738 return btrfs_ioctl_resize(root, argp);
f46b5a66 3739 case BTRFS_IOC_ADD_DEV:
4bcabaa3 3740 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 3741 case BTRFS_IOC_RM_DEV:
4bcabaa3 3742 return btrfs_ioctl_rm_dev(root, argp);
475f6387
JS		 3743 case BTRFS_IOC_FS_INFO:
3744 return btrfs_ioctl_fs_info(root, argp);
3745 case BTRFS_IOC_DEV_INFO:
3746 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 3747 case BTRFS_IOC_BALANCE:
9ba1f6e4 3748 return btrfs_ioctl_balance(file, NULL);
f46b5a66 3749 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 3750 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
3751 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 3752 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 3753 case BTRFS_IOC_TRANS_START:
3754 return btrfs_ioctl_trans_start(file);
3755 case BTRFS_IOC_TRANS_END:
3756 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 3757 case BTRFS_IOC_TREE_SEARCH:
3758 return btrfs_ioctl_tree_search(file, argp);
3759 case BTRFS_IOC_INO_LOOKUP:
3760 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 3761 case BTRFS_IOC_INO_PATHS:
3762 return btrfs_ioctl_ino_to_path(root, argp);
3763 case BTRFS_IOC_LOGICAL_INO:
3764 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 3765 case BTRFS_IOC_SPACE_INFO:
3766 return btrfs_ioctl_space_info(root, argp);
f46b5a66
CH		 3767 case BTRFS_IOC_SYNC:
3768 btrfs_sync_fs(file->f_dentry->d_sb, 1);
3769 return 0;
46204592
SW		 3770 case BTRFS_IOC_START_SYNC:
3771 return btrfs_ioctl_start_sync(file, argp);
3772 case BTRFS_IOC_WAIT_SYNC:
3773 return btrfs_ioctl_wait_sync(file, argp);
475f6387
JS		 3774 case BTRFS_IOC_SCRUB:
3775 return btrfs_ioctl_scrub(root, argp);
3776 case BTRFS_IOC_SCRUB_CANCEL:
3777 return btrfs_ioctl_scrub_cancel(root, argp);
3778 case BTRFS_IOC_SCRUB_PROGRESS:
3779 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 3780 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 3781 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 3782 case BTRFS_IOC_BALANCE_CTL:
3783 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 3784 case BTRFS_IOC_BALANCE_PROGRESS:
3785 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 3786 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
3787 return btrfs_ioctl_set_received_subvol(file, argp);
31db9f7c
AB		 3788 case BTRFS_IOC_SEND:
3789 return btrfs_ioctl_send(file, argp);
c11d2c23 3790 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 3791 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b
AJ		 3792 case BTRFS_IOC_QUOTA_CTL:
3793 return btrfs_ioctl_quota_ctl(root, argp);
3794 case BTRFS_IOC_QGROUP_ASSIGN:
3795 return btrfs_ioctl_qgroup_assign(root, argp);
3796 case BTRFS_IOC_QGROUP_CREATE:
3797 return btrfs_ioctl_qgroup_create(root, argp);
3798 case BTRFS_IOC_QGROUP_LIMIT:
3799 return btrfs_ioctl_qgroup_limit(root, argp);
f46b5a66
CH		 3800 }
3801
3802 return -ENOTTY;
3803}
kernel source for telekom puls (alcatel/mediatek)