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Btrfs: introduce a btrfs_dev_replace_item type
[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 }
109f2365
LB		 574 if (ret) {
575 /* cleanup_transaction has freed this for us */
576 if (trans->aborted)
577 pending_snapshot = NULL;
c37b2b62 578 goto fail;
109f2365 579 }
a22285a6
YZ		 580
581 ret = pending_snapshot->error;
582 if (ret)
583 goto fail;
584
66b4ffd1
JB		 585 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
586 if (ret)
587 goto fail;
f46b5a66 588
2fbe8c8a 589 inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
2e4bfab9
YZ		 590 if (IS_ERR(inode)) {
591 ret = PTR_ERR(inode);
592 goto fail;
593 }
594 BUG_ON(!inode);
595 d_instantiate(dentry, inode);
596 ret = 0;
597fail:
a22285a6 598 kfree(pending_snapshot);
f46b5a66
CH		 599 return ret;
600}
601
4260f7c7
SW		 602/* copy of check_sticky in fs/namei.c()
603* It's inline, so penalty for filesystems that don't use sticky bit is
604* minimal.
605*/
606static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
607{
2f2f43d3 608 kuid_t fsuid = current_fsuid();
4260f7c7
SW		 609
610 if (!(dir->i_mode & S_ISVTX))
611 return 0;
2f2f43d3 612 if (uid_eq(inode->i_uid, fsuid))
4260f7c7 613 return 0;
2f2f43d3 614 if (uid_eq(dir->i_uid, fsuid))
4260f7c7
SW		 615 return 0;
616 return !capable(CAP_FOWNER);
617}
618
619/* copy of may_delete in fs/namei.c()
620 * Check whether we can remove a link victim from directory dir, check
621 * whether the type of victim is right.
622 * 1. We can't do it if dir is read-only (done in permission())
623 * 2. We should have write and exec permissions on dir
624 * 3. We can't remove anything from append-only dir
625 * 4. We can't do anything with immutable dir (done in permission())
626 * 5. If the sticky bit on dir is set we should either
627 * a. be owner of dir, or
628 * b. be owner of victim, or
629 * c. have CAP_FOWNER capability
630 * 6. If the victim is append-only or immutable we can't do antyhing with
631 * links pointing to it.
632 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
633 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
634 * 9. We can't remove a root or mountpoint.
635 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
636 * nfs_async_unlink().
637 */
638
639static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir)
640{
641 int error;
642
643 if (!victim->d_inode)
644 return -ENOENT;
645
646 BUG_ON(victim->d_parent->d_inode != dir);
4fa6b5ec 647 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
4260f7c7
SW		 648
649 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
650 if (error)
651 return error;
652 if (IS_APPEND(dir))
653 return -EPERM;
654 if (btrfs_check_sticky(dir, victim->d_inode)||
655 IS_APPEND(victim->d_inode)||
656 IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
657 return -EPERM;
658 if (isdir) {
659 if (!S_ISDIR(victim->d_inode->i_mode))
660 return -ENOTDIR;
661 if (IS_ROOT(victim))
662 return -EBUSY;
663 } else if (S_ISDIR(victim->d_inode->i_mode))
664 return -EISDIR;
665 if (IS_DEADDIR(dir))
666 return -ENOENT;
667 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
668 return -EBUSY;
669 return 0;
670}
671
cb8e7090
CH		 672/* copy of may_create in fs/namei.c() */
673static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
674{
675 if (child->d_inode)
676 return -EEXIST;
677 if (IS_DEADDIR(dir))
678 return -ENOENT;
679 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
680}
681
682/*
683 * Create a new subvolume below @parent. This is largely modeled after
684 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
685 * inside this filesystem so it's quite a bit simpler.
686 */
76dda93c
YZ		 687static noinline int btrfs_mksubvol(struct path *parent,
688 char *name, int namelen,
72fd032e 689 struct btrfs_root *snap_src,
6f72c7e2
AJ		 690 u64 *async_transid, bool readonly,
691 struct btrfs_qgroup_inherit **inherit)
cb8e7090 692{
76dda93c 693 struct inode *dir = parent->dentry->d_inode;
cb8e7090
CH		 694 struct dentry *dentry;
695 int error;
696
76dda93c 697 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
cb8e7090
CH		 698
699 dentry = lookup_one_len(name, parent->dentry, namelen);
700 error = PTR_ERR(dentry);
701 if (IS_ERR(dentry))
702 goto out_unlock;
703
704 error = -EEXIST;
705 if (dentry->d_inode)
706 goto out_dput;
707
76dda93c 708 error = btrfs_may_create(dir, dentry);
cb8e7090 709 if (error)
a874a63e 710 goto out_dput;
cb8e7090 711
76dda93c
YZ		 712 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
713
714 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
715 goto out_up_read;
716
3de4586c 717 if (snap_src) {
6f72c7e2
AJ		 718 error = create_snapshot(snap_src, dentry, name, namelen,
719 async_transid, readonly, inherit);
3de4586c 720 } else {
76dda93c 721 error = create_subvol(BTRFS_I(dir)->root, dentry,
6f72c7e2 722 name, namelen, async_transid, inherit);
3de4586c 723 }
76dda93c
YZ		 724 if (!error)
725 fsnotify_mkdir(dir, dentry);
726out_up_read:
727 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
cb8e7090
CH		 728out_dput:
729 dput(dentry);
730out_unlock:
76dda93c 731 mutex_unlock(&dir->i_mutex);
cb8e7090
CH		 732 return error;
733}
734
4cb5300b
CM		 735/*
736 * When we're defragging a range, we don't want to kick it off again
737 * if it is really just waiting for delalloc to send it down.
738 * If we find a nice big extent or delalloc range for the bytes in the
739 * file you want to defrag, we return 0 to let you know to skip this
740 * part of the file
741 */
742static int check_defrag_in_cache(struct inode *inode, u64 offset, int thresh)
743{
744 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
745 struct extent_map *em = NULL;
746 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
747 u64 end;
748
749 read_lock(&em_tree->lock);
750 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
751 read_unlock(&em_tree->lock);
752
753 if (em) {
754 end = extent_map_end(em);
755 free_extent_map(em);
756 if (end - offset > thresh)
757 return 0;
758 }
759 /* if we already have a nice delalloc here, just stop */
760 thresh /= 2;
761 end = count_range_bits(io_tree, &offset, offset + thresh,
762 thresh, EXTENT_DELALLOC, 1);
763 if (end >= thresh)
764 return 0;
765 return 1;
766}
767
768/*
769 * helper function to walk through a file and find extents
770 * newer than a specific transid, and smaller than thresh.
771 *
772 * This is used by the defragging code to find new and small
773 * extents
774 */
775static int find_new_extents(struct btrfs_root *root,
776 struct inode *inode, u64 newer_than,
777 u64 *off, int thresh)
778{
779 struct btrfs_path *path;
780 struct btrfs_key min_key;
781 struct btrfs_key max_key;
782 struct extent_buffer *leaf;
783 struct btrfs_file_extent_item *extent;
784 int type;
785 int ret;
a4689d2b 786 u64 ino = btrfs_ino(inode);
4cb5300b
CM		 787
788 path = btrfs_alloc_path();
789 if (!path)
790 return -ENOMEM;
791
a4689d2b 792 min_key.objectid = ino;
4cb5300b
CM		 793 min_key.type = BTRFS_EXTENT_DATA_KEY;
794 min_key.offset = *off;
795
a4689d2b 796 max_key.objectid = ino;
4cb5300b
CM		 797 max_key.type = (u8)-1;
798 max_key.offset = (u64)-1;
799
800 path->keep_locks = 1;
801
802 while(1) {
803 ret = btrfs_search_forward(root, &min_key, &max_key,
804 path, 0, newer_than);
805 if (ret != 0)
806 goto none;
a4689d2b 807 if (min_key.objectid != ino)
4cb5300b
CM		 808 goto none;
809 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
810 goto none;
811
812 leaf = path->nodes[0];
813 extent = btrfs_item_ptr(leaf, path->slots[0],
814 struct btrfs_file_extent_item);
815
816 type = btrfs_file_extent_type(leaf, extent);
817 if (type == BTRFS_FILE_EXTENT_REG &&
818 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
819 check_defrag_in_cache(inode, min_key.offset, thresh)) {
820 *off = min_key.offset;
821 btrfs_free_path(path);
822 return 0;
823 }
824
825 if (min_key.offset == (u64)-1)
826 goto none;
827
828 min_key.offset++;
829 btrfs_release_path(path);
830 }
831none:
832 btrfs_free_path(path);
833 return -ENOENT;
834}
835
6c282eb4 836static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
17ce6ef8
LB		 837{
838 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
6c282eb4
LZ		 839 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
840 struct extent_map *em;
841 u64 len = PAGE_CACHE_SIZE;
17ce6ef8 842
6c282eb4
LZ		 843 /*
844 * hopefully we have this extent in the tree already, try without
845 * the full extent lock
846 */
17ce6ef8 847 read_lock(&em_tree->lock);
6c282eb4 848 em = lookup_extent_mapping(em_tree, start, len);
17ce6ef8
LB		 849 read_unlock(&em_tree->lock);
850
6c282eb4
LZ		 851 if (!em) {
852 /* get the big lock and read metadata off disk */
853 lock_extent(io_tree, start, start + len - 1);
854 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
855 unlock_extent(io_tree, start, start + len - 1);
856
857 if (IS_ERR(em))
858 return NULL;
859 }
860
861 return em;
862}
17ce6ef8 863
6c282eb4
LZ		 864static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
865{
866 struct extent_map *next;
867 bool ret = true;
868
869 /* this is the last extent */
870 if (em->start + em->len >= i_size_read(inode))
871 return false;
872
873 next = defrag_lookup_extent(inode, em->start + em->len);
874 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
875 ret = false;
876
877 free_extent_map(next);
17ce6ef8
LB		 878 return ret;
879}
880
6c282eb4 881static int should_defrag_range(struct inode *inode, u64 start, int thresh,
a43a2111
AM		 882 u64 *last_len, u64 *skip, u64 *defrag_end,
883 int compress)
940100a4 884{
6c282eb4 885 struct extent_map *em;
940100a4 886 int ret = 1;
6c282eb4 887 bool next_mergeable = true;
940100a4
CM		 888
889 /*
008873ea 890 * make sure that once we start defragging an extent, we keep on
940100a4
CM		 891 * defragging it
892 */
893 if (start < *defrag_end)
894 return 1;
895
896 *skip = 0;
897
6c282eb4
LZ		 898 em = defrag_lookup_extent(inode, start);
899 if (!em)
900 return 0;
940100a4
CM		 901
902 /* this will cover holes, and inline extents */
17ce6ef8 903 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
940100a4 904 ret = 0;
17ce6ef8
LB		 905 goto out;
906 }
907
6c282eb4 908 next_mergeable = defrag_check_next_extent(inode, em);
940100a4
CM		 909
910 /*
6c282eb4
LZ		 911 * we hit a real extent, if it is big or the next extent is not a
912 * real extent, don't bother defragging it
940100a4 913 */
a43a2111 914 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
6c282eb4 915 (em->len >= thresh || !next_mergeable))
940100a4 916 ret = 0;
17ce6ef8 917out:
940100a4
CM		 918 /*
919 * last_len ends up being a counter of how many bytes we've defragged.
920 * every time we choose not to defrag an extent, we reset *last_len
921 * so that the next tiny extent will force a defrag.
922 *
923 * The end result of this is that tiny extents before a single big
924 * extent will force at least part of that big extent to be defragged.
925 */
926 if (ret) {
940100a4
CM		 927 *defrag_end = extent_map_end(em);
928 } else {
929 *last_len = 0;
930 *skip = extent_map_end(em);
931 *defrag_end = 0;
932 }
933
934 free_extent_map(em);
935 return ret;
936}
937
4cb5300b
CM		 938/*
939 * it doesn't do much good to defrag one or two pages
940 * at a time. This pulls in a nice chunk of pages
941 * to COW and defrag.
942 *
943 * It also makes sure the delalloc code has enough
944 * dirty data to avoid making new small extents as part
945 * of the defrag
946 *
947 * It's a good idea to start RA on this range
948 * before calling this.
949 */
950static int cluster_pages_for_defrag(struct inode *inode,
951 struct page **pages,
952 unsigned long start_index,
953 int num_pages)
f46b5a66 954{
4cb5300b
CM		 955 unsigned long file_end;
956 u64 isize = i_size_read(inode);
957 u64 page_start;
958 u64 page_end;
1f12bd06 959 u64 page_cnt;
4cb5300b
CM		 960 int ret;
961 int i;
962 int i_done;
3eaa2885 963 struct btrfs_ordered_extent *ordered;
4cb5300b 964 struct extent_state *cached_state = NULL;
600a45e1 965 struct extent_io_tree *tree;
3b16a4e3 966 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
4cb5300b 967
4cb5300b 968 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1f12bd06
LB		 969 if (!isize || start_index > file_end)
970 return 0;
971
972 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
4cb5300b
CM		 973
974 ret = btrfs_delalloc_reserve_space(inode,
1f12bd06 975 page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 976 if (ret)
977 return ret;
4cb5300b 978 i_done = 0;
600a45e1 979 tree = &BTRFS_I(inode)->io_tree;
4cb5300b
CM		 980
981 /* step one, lock all the pages */
1f12bd06 982 for (i = 0; i < page_cnt; i++) {
4cb5300b 983 struct page *page;
600a45e1 984again:
a94733d0 985 page = find_or_create_page(inode->i_mapping,
600a45e1 986 start_index + i, mask);
4cb5300b
CM		 987 if (!page)
988 break;
989
600a45e1
MX		 990 page_start = page_offset(page);
991 page_end = page_start + PAGE_CACHE_SIZE - 1;
992 while (1) {
d0082371 993 lock_extent(tree, page_start, page_end);
600a45e1
MX		 994 ordered = btrfs_lookup_ordered_extent(inode,
995 page_start);
d0082371 996 unlock_extent(tree, page_start, page_end);
600a45e1
MX		 997 if (!ordered)
998 break;
999
1000 unlock_page(page);
1001 btrfs_start_ordered_extent(inode, ordered, 1);
1002 btrfs_put_ordered_extent(ordered);
1003 lock_page(page);
1f12bd06
LB		 1004 /*
1005 * we unlocked the page above, so we need check if
1006 * it was released or not.
1007 */
1008 if (page->mapping != inode->i_mapping) {
1009 unlock_page(page);
1010 page_cache_release(page);
1011 goto again;
1012 }
600a45e1
MX		 1013 }
1014
4cb5300b
CM		 1015 if (!PageUptodate(page)) {
1016 btrfs_readpage(NULL, page);
1017 lock_page(page);
1018 if (!PageUptodate(page)) {
1019 unlock_page(page);
1020 page_cache_release(page);
1021 ret = -EIO;
1022 break;
1023 }
1024 }
600a45e1 1025
600a45e1
MX		 1026 if (page->mapping != inode->i_mapping) {
1027 unlock_page(page);
1028 page_cache_release(page);
1029 goto again;
1030 }
1031
4cb5300b
CM		 1032 pages[i] = page;
1033 i_done++;
1034 }
1035 if (!i_done || ret)
1036 goto out;
1037
1038 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1039 goto out;
1040
1041 /*
1042 * so now we have a nice long stream of locked
1043 * and up to date pages, lets wait on them
1044 */
1045 for (i = 0; i < i_done; i++)
1046 wait_on_page_writeback(pages[i]);
1047
1048 page_start = page_offset(pages[0]);
1049 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1050
1051 lock_extent_bits(&BTRFS_I(inode)->io_tree,
d0082371 1052 page_start, page_end - 1, 0, &cached_state);
4cb5300b
CM		 1053 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1054 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
9e8a4a8b
LB		 1055 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1056 &cached_state, GFP_NOFS);
4cb5300b 1057
1f12bd06 1058 if (i_done != page_cnt) {
9e0baf60
JB		 1059 spin_lock(&BTRFS_I(inode)->lock);
1060 BTRFS_I(inode)->outstanding_extents++;
1061 spin_unlock(&BTRFS_I(inode)->lock);
4cb5300b 1062 btrfs_delalloc_release_space(inode,
1f12bd06 1063 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1064 }
1065
1066
9e8a4a8b
LB		 1067 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1068 &cached_state, GFP_NOFS);
4cb5300b
CM		 1069
1070 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1071 page_start, page_end - 1, &cached_state,
1072 GFP_NOFS);
1073
1074 for (i = 0; i < i_done; i++) {
1075 clear_page_dirty_for_io(pages[i]);
1076 ClearPageChecked(pages[i]);
1077 set_page_extent_mapped(pages[i]);
1078 set_page_dirty(pages[i]);
1079 unlock_page(pages[i]);
1080 page_cache_release(pages[i]);
1081 }
1082 return i_done;
1083out:
1084 for (i = 0; i < i_done; i++) {
1085 unlock_page(pages[i]);
1086 page_cache_release(pages[i]);
1087 }
1f12bd06 1088 btrfs_delalloc_release_space(inode, page_cnt << PAGE_CACHE_SHIFT);
4cb5300b
CM		 1089 return ret;
1090
1091}
1092
1093int btrfs_defrag_file(struct inode *inode, struct file *file,
1094 struct btrfs_ioctl_defrag_range_args *range,
1095 u64 newer_than, unsigned long max_to_defrag)
1096{
1097 struct btrfs_root *root = BTRFS_I(inode)->root;
4cb5300b 1098 struct file_ra_state *ra = NULL;
f46b5a66 1099 unsigned long last_index;
151a31b2 1100 u64 isize = i_size_read(inode);
940100a4
CM		 1101 u64 last_len = 0;
1102 u64 skip = 0;
1103 u64 defrag_end = 0;
4cb5300b 1104 u64 newer_off = range->start;
f46b5a66 1105 unsigned long i;
008873ea 1106 unsigned long ra_index = 0;
f46b5a66 1107 int ret;
4cb5300b 1108 int defrag_count = 0;
1a419d85 1109 int compress_type = BTRFS_COMPRESS_ZLIB;
4cb5300b 1110 int extent_thresh = range->extent_thresh;
008873ea
LZ		 1111 int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
1112 int cluster = max_cluster;
4cb5300b
CM		 1113 u64 new_align = ~((u64)128 * 1024 - 1);
1114 struct page **pages = NULL;
1115
1116 if (extent_thresh == 0)
1117 extent_thresh = 256 * 1024;
1a419d85
LZ		 1118
1119 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1120 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1121 return -EINVAL;
1122 if (range->compress_type)
1123 compress_type = range->compress_type;
1124 }
f46b5a66 1125
151a31b2 1126 if (isize == 0)
940100a4
CM		 1127 return 0;
1128
4cb5300b
CM		 1129 /*
1130 * if we were not given a file, allocate a readahead
1131 * context
1132 */
1133 if (!file) {
1134 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1135 if (!ra)
1136 return -ENOMEM;
1137 file_ra_state_init(ra, inode->i_mapping);
1138 } else {
1139 ra = &file->f_ra;
1140 }
1141
008873ea 1142 pages = kmalloc(sizeof(struct page *) * max_cluster,
4cb5300b
CM		 1143 GFP_NOFS);
1144 if (!pages) {
1145 ret = -ENOMEM;
1146 goto out_ra;
1147 }
1148
1149 /* find the last page to defrag */
1e701a32 1150 if (range->start + range->len > range->start) {
151a31b2 1151 last_index = min_t(u64, isize - 1,
1e701a32
CM		 1152 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1153 } else {
151a31b2 1154 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1e701a32
CM		 1155 }
1156
4cb5300b
CM		 1157 if (newer_than) {
1158 ret = find_new_extents(root, inode, newer_than,
1159 &newer_off, 64 * 1024);
1160 if (!ret) {
1161 range->start = newer_off;
1162 /*
1163 * we always align our defrag to help keep
1164 * the extents in the file evenly spaced
1165 */
1166 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1167 } else
1168 goto out_ra;
1169 } else {
1170 i = range->start >> PAGE_CACHE_SHIFT;
1171 }
1172 if (!max_to_defrag)
7ec31b54 1173 max_to_defrag = last_index + 1;
4cb5300b 1174
2a0f7f57
LZ		 1175 /*
1176 * make writeback starts from i, so the defrag range can be
1177 * written sequentially.
1178 */
1179 if (i < inode->i_mapping->writeback_index)
1180 inode->i_mapping->writeback_index = i;
1181
f7f43cc8
CM		 1182 while (i <= last_index && defrag_count < max_to_defrag &&
1183 (i < (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >>
1184 PAGE_CACHE_SHIFT)) {
4cb5300b
CM		 1185 /*
1186 * make sure we stop running if someone unmounts
1187 * the FS
1188 */
1189 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1190 break;
1191
66c26892 1192 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
6c282eb4 1193 extent_thresh, &last_len, &skip,
a43a2111
AM		 1194 &defrag_end, range->flags &
1195 BTRFS_DEFRAG_RANGE_COMPRESS)) {
940100a4
CM		 1196 unsigned long next;
1197 /*
1198 * the should_defrag function tells us how much to skip
1199 * bump our counter by the suggested amount
1200 */
1201 next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
1202 i = max(i + 1, next);
1203 continue;
1204 }
008873ea
LZ		 1205
1206 if (!newer_than) {
1207 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1208 PAGE_CACHE_SHIFT) - i;
1209 cluster = min(cluster, max_cluster);
1210 } else {
1211 cluster = max_cluster;
1212 }
1213
1e701a32 1214 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1a419d85 1215 BTRFS_I(inode)->force_compress = compress_type;
940100a4 1216
008873ea
LZ		 1217 if (i + cluster > ra_index) {
1218 ra_index = max(i, ra_index);
1219 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1220 cluster);
1221 ra_index += max_cluster;
1222 }
940100a4 1223
ecb8bea8 1224 mutex_lock(&inode->i_mutex);
008873ea 1225 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
ecb8bea8
LB		 1226 if (ret < 0) {
1227 mutex_unlock(&inode->i_mutex);
4cb5300b 1228 goto out_ra;
ecb8bea8 1229 }
4cb5300b
CM		 1230
1231 defrag_count += ret;
1232 balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret);
ecb8bea8 1233 mutex_unlock(&inode->i_mutex);
4cb5300b
CM		 1234
1235 if (newer_than) {
1236 if (newer_off == (u64)-1)
1237 break;
1238
e1f041e1
LB		 1239 if (ret > 0)
1240 i += ret;
1241
4cb5300b
CM		 1242 newer_off = max(newer_off + 1,
1243 (u64)i << PAGE_CACHE_SHIFT);
1244
1245 ret = find_new_extents(root, inode,
1246 newer_than, &newer_off,
1247 64 * 1024);
1248 if (!ret) {
1249 range->start = newer_off;
1250 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
4cb5300b
CM		 1251 } else {
1252 break;
f46b5a66 1253 }
4cb5300b 1254 } else {
008873ea 1255 if (ret > 0) {
cbcc8326 1256 i += ret;
008873ea
LZ		 1257 last_len += ret << PAGE_CACHE_SHIFT;
1258 } else {
cbcc8326 1259 i++;
008873ea
LZ		 1260 last_len = 0;
1261 }
f46b5a66 1262 }
f46b5a66
CH		 1263 }
1264
1e701a32
CM		 1265 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO))
1266 filemap_flush(inode->i_mapping);
1267
1268 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1269 /* the filemap_flush will queue IO into the worker threads, but
1270 * we have to make sure the IO is actually started and that
1271 * ordered extents get created before we return
1272 */
1273 atomic_inc(&root->fs_info->async_submit_draining);
1274 while (atomic_read(&root->fs_info->nr_async_submits) ||
1275 atomic_read(&root->fs_info->async_delalloc_pages)) {
1276 wait_event(root->fs_info->async_submit_wait,
1277 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1278 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1279 }
1280 atomic_dec(&root->fs_info->async_submit_draining);
1281
1282 mutex_lock(&inode->i_mutex);
261507a0 1283 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1e701a32
CM		 1284 mutex_unlock(&inode->i_mutex);
1285 }
1286
1a419d85 1287 if (range->compress_type == BTRFS_COMPRESS_LZO) {
2b0ce2c2 1288 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1a419d85
LZ		 1289 }
1290
60ccf82f 1291 ret = defrag_count;
940100a4 1292
4cb5300b
CM		 1293out_ra:
1294 if (!file)
1295 kfree(ra);
1296 kfree(pages);
940100a4 1297 return ret;
f46b5a66
CH		 1298}
1299
76dda93c
YZ		 1300static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
1301 void __user *arg)
f46b5a66
CH		 1302{
1303 u64 new_size;
1304 u64 old_size;
1305 u64 devid = 1;
1306 struct btrfs_ioctl_vol_args *vol_args;
1307 struct btrfs_trans_handle *trans;
1308 struct btrfs_device *device = NULL;
1309 char *sizestr;
1310 char *devstr = NULL;
1311 int ret = 0;
f46b5a66
CH		 1312 int mod = 0;
1313
c146afad
YZ		 1314 if (root->fs_info->sb->s_flags & MS_RDONLY)
1315 return -EROFS;
1316
e441d54d
CM		 1317 if (!capable(CAP_SYS_ADMIN))
1318 return -EPERM;
1319
c9e9f97b
ID		 1320 mutex_lock(&root->fs_info->volume_mutex);
1321 if (root->fs_info->balance_ctl) {
1322 printk(KERN_INFO "btrfs: balance in progress\n");
1323 ret = -EINVAL;
1324 goto out;
1325 }
1326
dae7b665 1327 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 1328 if (IS_ERR(vol_args)) {
1329 ret = PTR_ERR(vol_args);
1330 goto out;
1331 }
5516e595
MF		 1332
1333 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66 1334
f46b5a66
CH		 1335 sizestr = vol_args->name;
1336 devstr = strchr(sizestr, ':');
1337 if (devstr) {
1338 char *end;
1339 sizestr = devstr + 1;
1340 *devstr = '\0';
1341 devstr = vol_args->name;
1342 devid = simple_strtoull(devstr, &end, 10);
5bb14682 1343 printk(KERN_INFO "btrfs: resizing devid %llu\n",
21380931 1344 (unsigned long long)devid);
f46b5a66 1345 }
aa1b8cd4 1346 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
f46b5a66 1347 if (!device) {
5bb14682 1348 printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
21380931 1349 (unsigned long long)devid);
f46b5a66 1350 ret = -EINVAL;
c9e9f97b 1351 goto out_free;
f46b5a66 1352 }
4e42ae1b
LB		 1353 if (device->fs_devices && device->fs_devices->seeding) {
1354 printk(KERN_INFO "btrfs: resizer unable to apply on "
a8c4a33b
CM		 1355 "seeding device %llu\n",
1356 (unsigned long long)devid);
4e42ae1b
LB		 1357 ret = -EINVAL;
1358 goto out_free;
1359 }
1360
f46b5a66
CH		 1361 if (!strcmp(sizestr, "max"))
1362 new_size = device->bdev->bd_inode->i_size;
1363 else {
1364 if (sizestr[0] == '-') {
1365 mod = -1;
1366 sizestr++;
1367 } else if (sizestr[0] == '+') {
1368 mod = 1;
1369 sizestr++;
1370 }
91748467 1371 new_size = memparse(sizestr, NULL);
f46b5a66
CH		 1372 if (new_size == 0) {
1373 ret = -EINVAL;
c9e9f97b 1374 goto out_free;
f46b5a66
CH		 1375 }
1376 }
1377
1378 old_size = device->total_bytes;
1379
1380 if (mod < 0) {
1381 if (new_size > old_size) {
1382 ret = -EINVAL;
c9e9f97b 1383 goto out_free;
f46b5a66
CH		 1384 }
1385 new_size = old_size - new_size;
1386 } else if (mod > 0) {
1387 new_size = old_size + new_size;
1388 }
1389
1390 if (new_size < 256 * 1024 * 1024) {
1391 ret = -EINVAL;
c9e9f97b 1392 goto out_free;
f46b5a66
CH		 1393 }
1394 if (new_size > device->bdev->bd_inode->i_size) {
1395 ret = -EFBIG;
c9e9f97b 1396 goto out_free;
f46b5a66
CH		 1397 }
1398
1399 do_div(new_size, root->sectorsize);
1400 new_size *= root->sectorsize;
1401
606686ee
JB		 1402 printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
1403 rcu_str_deref(device->name),
1404 (unsigned long long)new_size);
f46b5a66
CH		 1405
1406 if (new_size > old_size) {
a22285a6 1407 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 1408 if (IS_ERR(trans)) {
1409 ret = PTR_ERR(trans);
c9e9f97b 1410 goto out_free;
98d5dc13 1411 }
f46b5a66
CH		 1412 ret = btrfs_grow_device(trans, device, new_size);
1413 btrfs_commit_transaction(trans, root);
ece7d20e 1414 } else if (new_size < old_size) {
f46b5a66 1415 ret = btrfs_shrink_device(device, new_size);
0253f40e 1416 } /* equal, nothing need to do */
f46b5a66 1417
c9e9f97b 1418out_free:
f46b5a66 1419 kfree(vol_args);
c9e9f97b
ID		 1420out:
1421 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 1422 return ret;
1423}
1424
72fd032e 1425static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
6f72c7e2
AJ		 1426 char *name, unsigned long fd, int subvol,
1427 u64 *transid, bool readonly,
1428 struct btrfs_qgroup_inherit **inherit)
f46b5a66 1429{
f46b5a66 1430 int namelen;
3de4586c 1431 int ret = 0;
f46b5a66 1432
a874a63e
LB		 1433 ret = mnt_want_write_file(file);
1434 if (ret)
1435 goto out;
1436
72fd032e
SW		 1437 namelen = strlen(name);
1438 if (strchr(name, '/')) {
f46b5a66 1439 ret = -EINVAL;
a874a63e 1440 goto out_drop_write;
f46b5a66
CH		 1441 }
1442
16780cab
CM		 1443 if (name[0] == '.' &&
1444 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1445 ret = -EEXIST;
a874a63e 1446 goto out_drop_write;
16780cab
CM		 1447 }
1448
3de4586c 1449 if (subvol) {
72fd032e 1450 ret = btrfs_mksubvol(&file->f_path, name, namelen,
6f72c7e2 1451 NULL, transid, readonly, inherit);
cb8e7090 1452 } else {
2903ff01 1453 struct fd src = fdget(fd);
3de4586c 1454 struct inode *src_inode;
2903ff01 1455 if (!src.file) {
3de4586c 1456 ret = -EINVAL;
a874a63e 1457 goto out_drop_write;
3de4586c
CM		 1458 }
1459
2903ff01 1460 src_inode = src.file->f_path.dentry->d_inode;
3de4586c 1461 if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) {
d397712b
CM		 1462 printk(KERN_INFO "btrfs: Snapshot src from "
1463 "another FS\n");
3de4586c 1464 ret = -EINVAL;
ecd18815
AV		 1465 } else {
1466 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1467 BTRFS_I(src_inode)->root,
1468 transid, readonly, inherit);
3de4586c 1469 }
2903ff01 1470 fdput(src);
cb8e7090 1471 }
a874a63e
LB		 1472out_drop_write:
1473 mnt_drop_write_file(file);
f46b5a66 1474out:
72fd032e
SW		 1475 return ret;
1476}
1477
1478static noinline int btrfs_ioctl_snap_create(struct file *file,
fa0d2b9b 1479 void __user *arg, int subvol)
72fd032e 1480{
fa0d2b9b 1481 struct btrfs_ioctl_vol_args *vol_args;
72fd032e
SW		 1482 int ret;
1483
fa0d2b9b
LZ		 1484 vol_args = memdup_user(arg, sizeof(*vol_args));
1485 if (IS_ERR(vol_args))
1486 return PTR_ERR(vol_args);
1487 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
72fd032e 1488
fa0d2b9b 1489 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
b83cc969 1490 vol_args->fd, subvol,
6f72c7e2 1491 NULL, false, NULL);
fdfb1e4f 1492
fa0d2b9b
LZ		 1493 kfree(vol_args);
1494 return ret;
1495}
fdfb1e4f 1496
fa0d2b9b
LZ		 1497static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1498 void __user *arg, int subvol)
1499{
1500 struct btrfs_ioctl_vol_args_v2 *vol_args;
1501 int ret;
1502 u64 transid = 0;
1503 u64 *ptr = NULL;
b83cc969 1504 bool readonly = false;
6f72c7e2 1505 struct btrfs_qgroup_inherit *inherit = NULL;
75eaa0e2 1506
fa0d2b9b
LZ		 1507 vol_args = memdup_user(arg, sizeof(*vol_args));
1508 if (IS_ERR(vol_args))
1509 return PTR_ERR(vol_args);
1510 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
75eaa0e2 1511
b83cc969 1512 if (vol_args->flags &
6f72c7e2
AJ		 1513 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1514 BTRFS_SUBVOL_QGROUP_INHERIT)) {
b83cc969 1515 ret = -EOPNOTSUPP;
fa0d2b9b 1516 goto out;
72fd032e 1517 }
fa0d2b9b
LZ		 1518
1519 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1520 ptr = &transid;
b83cc969
LZ		 1521 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1522 readonly = true;
6f72c7e2
AJ		 1523 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1524 if (vol_args->size > PAGE_CACHE_SIZE) {
1525 ret = -EINVAL;
1526 goto out;
1527 }
1528 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1529 if (IS_ERR(inherit)) {
1530 ret = PTR_ERR(inherit);
1531 goto out;
1532 }
1533 }
fa0d2b9b
LZ		 1534
1535 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
6f72c7e2
AJ		 1536 vol_args->fd, subvol, ptr,
1537 readonly, &inherit);
fa0d2b9b
LZ		 1538
1539 if (ret == 0 && ptr &&
1540 copy_to_user(arg +
1541 offsetof(struct btrfs_ioctl_vol_args_v2,
1542 transid), ptr, sizeof(*ptr)))
1543 ret = -EFAULT;
fdfb1e4f 1544out:
f46b5a66 1545 kfree(vol_args);
6f72c7e2 1546 kfree(inherit);
f46b5a66
CH		 1547 return ret;
1548}
1549
0caa102d
LZ		 1550static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1551 void __user *arg)
1552{
1553 struct inode *inode = fdentry(file)->d_inode;
1554 struct btrfs_root *root = BTRFS_I(inode)->root;
1555 int ret = 0;
1556 u64 flags = 0;
1557
33345d01 1558 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
0caa102d
LZ		 1559 return -EINVAL;
1560
1561 down_read(&root->fs_info->subvol_sem);
1562 if (btrfs_root_readonly(root))
1563 flags |= BTRFS_SUBVOL_RDONLY;
1564 up_read(&root->fs_info->subvol_sem);
1565
1566 if (copy_to_user(arg, &flags, sizeof(flags)))
1567 ret = -EFAULT;
1568
1569 return ret;
1570}
1571
1572static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1573 void __user *arg)
1574{
1575 struct inode *inode = fdentry(file)->d_inode;
1576 struct btrfs_root *root = BTRFS_I(inode)->root;
1577 struct btrfs_trans_handle *trans;
1578 u64 root_flags;
1579 u64 flags;
1580 int ret = 0;
1581
b9ca0664
LB		 1582 ret = mnt_want_write_file(file);
1583 if (ret)
1584 goto out;
0caa102d 1585
b9ca0664
LB		 1586 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1587 ret = -EINVAL;
1588 goto out_drop_write;
1589 }
0caa102d 1590
b9ca0664
LB		 1591 if (copy_from_user(&flags, arg, sizeof(flags))) {
1592 ret = -EFAULT;
1593 goto out_drop_write;
1594 }
0caa102d 1595
b9ca0664
LB		 1596 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1597 ret = -EINVAL;
1598 goto out_drop_write;
1599 }
0caa102d 1600
b9ca0664
LB		 1601 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1602 ret = -EOPNOTSUPP;
1603 goto out_drop_write;
1604 }
0caa102d 1605
b9ca0664
LB		 1606 if (!inode_owner_or_capable(inode)) {
1607 ret = -EACCES;
1608 goto out_drop_write;
1609 }
b4dc2b8c 1610
0caa102d
LZ		 1611 down_write(&root->fs_info->subvol_sem);
1612
1613 /* nothing to do */
1614 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
b9ca0664 1615 goto out_drop_sem;
0caa102d
LZ		 1616
1617 root_flags = btrfs_root_flags(&root->root_item);
1618 if (flags & BTRFS_SUBVOL_RDONLY)
1619 btrfs_set_root_flags(&root->root_item,
1620 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1621 else
1622 btrfs_set_root_flags(&root->root_item,
1623 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1624
1625 trans = btrfs_start_transaction(root, 1);
1626 if (IS_ERR(trans)) {
1627 ret = PTR_ERR(trans);
1628 goto out_reset;
1629 }
1630
b4dc2b8c 1631 ret = btrfs_update_root(trans, root->fs_info->tree_root,
0caa102d
LZ		 1632 &root->root_key, &root->root_item);
1633
1634 btrfs_commit_transaction(trans, root);
1635out_reset:
1636 if (ret)
1637 btrfs_set_root_flags(&root->root_item, root_flags);
b9ca0664 1638out_drop_sem:
0caa102d 1639 up_write(&root->fs_info->subvol_sem);
b9ca0664
LB		 1640out_drop_write:
1641 mnt_drop_write_file(file);
1642out:
0caa102d
LZ		 1643 return ret;
1644}
1645
76dda93c
YZ		 1646/*
1647 * helper to check if the subvolume references other subvolumes
1648 */
1649static noinline int may_destroy_subvol(struct btrfs_root *root)
1650{
1651 struct btrfs_path *path;
1652 struct btrfs_key key;
1653 int ret;
1654
1655 path = btrfs_alloc_path();
1656 if (!path)
1657 return -ENOMEM;
1658
1659 key.objectid = root->root_key.objectid;
1660 key.type = BTRFS_ROOT_REF_KEY;
1661 key.offset = (u64)-1;
1662
1663 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1664 &key, path, 0, 0);
1665 if (ret < 0)
1666 goto out;
1667 BUG_ON(ret == 0);
1668
1669 ret = 0;
1670 if (path->slots[0] > 0) {
1671 path->slots[0]--;
1672 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1673 if (key.objectid == root->root_key.objectid &&
1674 key.type == BTRFS_ROOT_REF_KEY)
1675 ret = -ENOTEMPTY;
1676 }
1677out:
1678 btrfs_free_path(path);
1679 return ret;
1680}
1681
ac8e9819
CM		 1682static noinline int key_in_sk(struct btrfs_key *key,
1683 struct btrfs_ioctl_search_key *sk)
1684{
abc6e134
CM		 1685 struct btrfs_key test;
1686 int ret;
1687
1688 test.objectid = sk->min_objectid;
1689 test.type = sk->min_type;
1690 test.offset = sk->min_offset;
1691
1692 ret = btrfs_comp_cpu_keys(key, &test);
1693 if (ret < 0)
ac8e9819 1694 return 0;
abc6e134
CM		 1695
1696 test.objectid = sk->max_objectid;
1697 test.type = sk->max_type;
1698 test.offset = sk->max_offset;
1699
1700 ret = btrfs_comp_cpu_keys(key, &test);
1701 if (ret > 0)
ac8e9819
CM		 1702 return 0;
1703 return 1;
1704}
1705
1706static noinline int copy_to_sk(struct btrfs_root *root,
1707 struct btrfs_path *path,
1708 struct btrfs_key *key,
1709 struct btrfs_ioctl_search_key *sk,
1710 char *buf,
1711 unsigned long *sk_offset,
1712 int *num_found)
1713{
1714 u64 found_transid;
1715 struct extent_buffer *leaf;
1716 struct btrfs_ioctl_search_header sh;
1717 unsigned long item_off;
1718 unsigned long item_len;
1719 int nritems;
1720 int i;
1721 int slot;
ac8e9819
CM		 1722 int ret = 0;
1723
1724 leaf = path->nodes[0];
1725 slot = path->slots[0];
1726 nritems = btrfs_header_nritems(leaf);
1727
1728 if (btrfs_header_generation(leaf) > sk->max_transid) {
1729 i = nritems;
1730 goto advance_key;
1731 }
1732 found_transid = btrfs_header_generation(leaf);
1733
1734 for (i = slot; i < nritems; i++) {
1735 item_off = btrfs_item_ptr_offset(leaf, i);
1736 item_len = btrfs_item_size_nr(leaf, i);
1737
1738 if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE)
1739 item_len = 0;
1740
1741 if (sizeof(sh) + item_len + *sk_offset >
1742 BTRFS_SEARCH_ARGS_BUFSIZE) {
1743 ret = 1;
1744 goto overflow;
1745 }
1746
1747 btrfs_item_key_to_cpu(leaf, key, i);
1748 if (!key_in_sk(key, sk))
1749 continue;
1750
1751 sh.objectid = key->objectid;
1752 sh.offset = key->offset;
1753 sh.type = key->type;
1754 sh.len = item_len;
1755 sh.transid = found_transid;
1756
1757 /* copy search result header */
1758 memcpy(buf + *sk_offset, &sh, sizeof(sh));
1759 *sk_offset += sizeof(sh);
1760
1761 if (item_len) {
1762 char *p = buf + *sk_offset;
1763 /* copy the item */
1764 read_extent_buffer(leaf, p,
1765 item_off, item_len);
1766 *sk_offset += item_len;
ac8e9819 1767 }
e2156867 1768 (*num_found)++;
ac8e9819
CM		 1769
1770 if (*num_found >= sk->nr_items)
1771 break;
1772 }
1773advance_key:
abc6e134
CM		 1774 ret = 0;
1775 if (key->offset < (u64)-1 && key->offset < sk->max_offset)
ac8e9819 1776 key->offset++;
abc6e134
CM		 1777 else if (key->type < (u8)-1 && key->type < sk->max_type) {
1778 key->offset = 0;
ac8e9819 1779 key->type++;
abc6e134
CM		 1780 } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) {
1781 key->offset = 0;
1782 key->type = 0;
ac8e9819 1783 key->objectid++;
abc6e134
CM		 1784 } else
1785 ret = 1;
ac8e9819 1786overflow:
ac8e9819
CM		 1787 return ret;
1788}
1789
1790static noinline int search_ioctl(struct inode *inode,
1791 struct btrfs_ioctl_search_args *args)
1792{
1793 struct btrfs_root *root;
1794 struct btrfs_key key;
1795 struct btrfs_key max_key;
1796 struct btrfs_path *path;
1797 struct btrfs_ioctl_search_key *sk = &args->key;
1798 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
1799 int ret;
1800 int num_found = 0;
1801 unsigned long sk_offset = 0;
1802
1803 path = btrfs_alloc_path();
1804 if (!path)
1805 return -ENOMEM;
1806
1807 if (sk->tree_id == 0) {
1808 /* search the root of the inode that was passed */
1809 root = BTRFS_I(inode)->root;
1810 } else {
1811 key.objectid = sk->tree_id;
1812 key.type = BTRFS_ROOT_ITEM_KEY;
1813 key.offset = (u64)-1;
1814 root = btrfs_read_fs_root_no_name(info, &key);
1815 if (IS_ERR(root)) {
1816 printk(KERN_ERR "could not find root %llu\n",
1817 sk->tree_id);
1818 btrfs_free_path(path);
1819 return -ENOENT;
1820 }
1821 }
1822
1823 key.objectid = sk->min_objectid;
1824 key.type = sk->min_type;
1825 key.offset = sk->min_offset;
1826
1827 max_key.objectid = sk->max_objectid;
1828 max_key.type = sk->max_type;
1829 max_key.offset = sk->max_offset;
1830
1831 path->keep_locks = 1;
1832
1833 while(1) {
1834 ret = btrfs_search_forward(root, &key, &max_key, path, 0,
1835 sk->min_transid);
1836 if (ret != 0) {
1837 if (ret > 0)
1838 ret = 0;
1839 goto err;
1840 }
1841 ret = copy_to_sk(root, path, &key, sk, args->buf,
1842 &sk_offset, &num_found);
b3b4aa74 1843 btrfs_release_path(path);
ac8e9819
CM		 1844 if (ret || num_found >= sk->nr_items)
1845 break;
1846
1847 }
1848 ret = 0;
1849err:
1850 sk->nr_items = num_found;
1851 btrfs_free_path(path);
1852 return ret;
1853}
1854
1855static noinline int btrfs_ioctl_tree_search(struct file *file,
1856 void __user *argp)
1857{
1858 struct btrfs_ioctl_search_args *args;
1859 struct inode *inode;
1860 int ret;
1861
1862 if (!capable(CAP_SYS_ADMIN))
1863 return -EPERM;
1864
2354d08f
JL		 1865 args = memdup_user(argp, sizeof(*args));
1866 if (IS_ERR(args))
1867 return PTR_ERR(args);
ac8e9819 1868
ac8e9819
CM		 1869 inode = fdentry(file)->d_inode;
1870 ret = search_ioctl(inode, args);
1871 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1872 ret = -EFAULT;
1873 kfree(args);
1874 return ret;
1875}
1876
98d377a0 1877/*
ac8e9819
CM		 1878 * Search INODE_REFs to identify path name of 'dirid' directory
1879 * in a 'tree_id' tree. and sets path name to 'name'.
1880 */
98d377a0
TH		 1881static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
1882 u64 tree_id, u64 dirid, char *name)
1883{
1884 struct btrfs_root *root;
1885 struct btrfs_key key;
ac8e9819 1886 char *ptr;
98d377a0
TH		 1887 int ret = -1;
1888 int slot;
1889 int len;
1890 int total_len = 0;
1891 struct btrfs_inode_ref *iref;
1892 struct extent_buffer *l;
1893 struct btrfs_path *path;
1894
1895 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
1896 name[0]='\0';
1897 return 0;
1898 }
1899
1900 path = btrfs_alloc_path();
1901 if (!path)
1902 return -ENOMEM;
1903
ac8e9819 1904 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
98d377a0
TH		 1905
1906 key.objectid = tree_id;
1907 key.type = BTRFS_ROOT_ITEM_KEY;
1908 key.offset = (u64)-1;
1909 root = btrfs_read_fs_root_no_name(info, &key);
1910 if (IS_ERR(root)) {
1911 printk(KERN_ERR "could not find root %llu\n", tree_id);
8ad6fcab
CM		 1912 ret = -ENOENT;
1913 goto out;
98d377a0
TH		 1914 }
1915
1916 key.objectid = dirid;
1917 key.type = BTRFS_INODE_REF_KEY;
8ad6fcab 1918 key.offset = (u64)-1;
98d377a0
TH		 1919
1920 while(1) {
1921 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1922 if (ret < 0)
1923 goto out;
1924
1925 l = path->nodes[0];
1926 slot = path->slots[0];
8ad6fcab
CM		 1927 if (ret > 0 && slot > 0)
1928 slot--;
98d377a0
TH		 1929 btrfs_item_key_to_cpu(l, &key, slot);
1930
1931 if (ret > 0 && (key.objectid != dirid ||
ac8e9819
CM		 1932 key.type != BTRFS_INODE_REF_KEY)) {
1933 ret = -ENOENT;
98d377a0 1934 goto out;
ac8e9819 1935 }
98d377a0
TH		 1936
1937 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
1938 len = btrfs_inode_ref_name_len(l, iref);
1939 ptr -= len + 1;
1940 total_len += len + 1;
ac8e9819 1941 if (ptr < name)
98d377a0
TH		 1942 goto out;
1943
1944 *(ptr + len) = '/';
1945 read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
1946
1947 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
1948 break;
1949
b3b4aa74 1950 btrfs_release_path(path);
98d377a0 1951 key.objectid = key.offset;
8ad6fcab 1952 key.offset = (u64)-1;
98d377a0 1953 dirid = key.objectid;
98d377a0 1954 }
ac8e9819 1955 if (ptr < name)
98d377a0 1956 goto out;
77906a50 1957 memmove(name, ptr, total_len);
98d377a0
TH		 1958 name[total_len]='\0';
1959 ret = 0;
1960out:
1961 btrfs_free_path(path);
ac8e9819
CM		 1962 return ret;
1963}
1964
1965static noinline int btrfs_ioctl_ino_lookup(struct file *file,
1966 void __user *argp)
1967{
1968 struct btrfs_ioctl_ino_lookup_args *args;
1969 struct inode *inode;
1970 int ret;
1971
1972 if (!capable(CAP_SYS_ADMIN))
1973 return -EPERM;
1974
2354d08f
JL		 1975 args = memdup_user(argp, sizeof(*args));
1976 if (IS_ERR(args))
1977 return PTR_ERR(args);
c2b96929 1978
ac8e9819
CM		 1979 inode = fdentry(file)->d_inode;
1980
1b53ac4d
CM		 1981 if (args->treeid == 0)
1982 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
1983
ac8e9819
CM		 1984 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
1985 args->treeid, args->objectid,
1986 args->name);
1987
1988 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
1989 ret = -EFAULT;
1990
1991 kfree(args);
98d377a0
TH		 1992 return ret;
1993}
1994
76dda93c
YZ		 1995static noinline int btrfs_ioctl_snap_destroy(struct file *file,
1996 void __user *arg)
1997{
1998 struct dentry *parent = fdentry(file);
1999 struct dentry *dentry;
2000 struct inode *dir = parent->d_inode;
2001 struct inode *inode;
2002 struct btrfs_root *root = BTRFS_I(dir)->root;
2003 struct btrfs_root *dest = NULL;
2004 struct btrfs_ioctl_vol_args *vol_args;
2005 struct btrfs_trans_handle *trans;
2006 int namelen;
2007 int ret;
2008 int err = 0;
2009
76dda93c
YZ		 2010 vol_args = memdup_user(arg, sizeof(*vol_args));
2011 if (IS_ERR(vol_args))
2012 return PTR_ERR(vol_args);
2013
2014 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2015 namelen = strlen(vol_args->name);
2016 if (strchr(vol_args->name, '/') ||
2017 strncmp(vol_args->name, "..", namelen) == 0) {
2018 err = -EINVAL;
2019 goto out;
2020 }
2021
a561be71 2022 err = mnt_want_write_file(file);
76dda93c
YZ		 2023 if (err)
2024 goto out;
2025
2026 mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
2027 dentry = lookup_one_len(vol_args->name, parent, namelen);
2028 if (IS_ERR(dentry)) {
2029 err = PTR_ERR(dentry);
2030 goto out_unlock_dir;
2031 }
2032
2033 if (!dentry->d_inode) {
2034 err = -ENOENT;
2035 goto out_dput;
2036 }
2037
2038 inode = dentry->d_inode;
4260f7c7
SW		 2039 dest = BTRFS_I(inode)->root;
2040 if (!capable(CAP_SYS_ADMIN)){
2041 /*
2042 * Regular user. Only allow this with a special mount
2043 * option, when the user has write+exec access to the
2044 * subvol root, and when rmdir(2) would have been
2045 * allowed.
2046 *
2047 * Note that this is _not_ check that the subvol is
2048 * empty or doesn't contain data that we wouldn't
2049 * otherwise be able to delete.
2050 *
2051 * Users who want to delete empty subvols should try
2052 * rmdir(2).
2053 */
2054 err = -EPERM;
2055 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2056 goto out_dput;
2057
2058 /*
2059 * Do not allow deletion if the parent dir is the same
2060 * as the dir to be deleted. That means the ioctl
2061 * must be called on the dentry referencing the root
2062 * of the subvol, not a random directory contained
2063 * within it.
2064 */
2065 err = -EINVAL;
2066 if (root == dest)
2067 goto out_dput;
2068
2069 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2070 if (err)
2071 goto out_dput;
2072
2073 /* check if subvolume may be deleted by a non-root user */
2074 err = btrfs_may_delete(dir, dentry, 1);
2075 if (err)
2076 goto out_dput;
2077 }
2078
33345d01 2079 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
76dda93c
YZ		 2080 err = -EINVAL;
2081 goto out_dput;
2082 }
2083
76dda93c
YZ		 2084 mutex_lock(&inode->i_mutex);
2085 err = d_invalidate(dentry);
2086 if (err)
2087 goto out_unlock;
2088
2089 down_write(&root->fs_info->subvol_sem);
2090
2091 err = may_destroy_subvol(dest);
2092 if (err)
2093 goto out_up_write;
2094
a22285a6
YZ		 2095 trans = btrfs_start_transaction(root, 0);
2096 if (IS_ERR(trans)) {
2097 err = PTR_ERR(trans);
d327099a 2098 goto out_up_write;
a22285a6
YZ		 2099 }
2100 trans->block_rsv = &root->fs_info->global_block_rsv;
2101
76dda93c
YZ		 2102 ret = btrfs_unlink_subvol(trans, root, dir,
2103 dest->root_key.objectid,
2104 dentry->d_name.name,
2105 dentry->d_name.len);
79787eaa
JM		 2106 if (ret) {
2107 err = ret;
2108 btrfs_abort_transaction(trans, root, ret);
2109 goto out_end_trans;
2110 }
76dda93c
YZ		 2111
2112 btrfs_record_root_in_trans(trans, dest);
2113
2114 memset(&dest->root_item.drop_progress, 0,
2115 sizeof(dest->root_item.drop_progress));
2116 dest->root_item.drop_level = 0;
2117 btrfs_set_root_refs(&dest->root_item, 0);
2118
d68fc57b
YZ		 2119 if (!xchg(&dest->orphan_item_inserted, 1)) {
2120 ret = btrfs_insert_orphan_item(trans,
2121 root->fs_info->tree_root,
2122 dest->root_key.objectid);
79787eaa
JM		 2123 if (ret) {
2124 btrfs_abort_transaction(trans, root, ret);
2125 err = ret;
2126 goto out_end_trans;
2127 }
d68fc57b 2128 }
79787eaa 2129out_end_trans:
531cb13f 2130 ret = btrfs_end_transaction(trans, root);
79787eaa
JM		 2131 if (ret && !err)
2132 err = ret;
76dda93c
YZ		 2133 inode->i_flags |= S_DEAD;
2134out_up_write:
2135 up_write(&root->fs_info->subvol_sem);
2136out_unlock:
2137 mutex_unlock(&inode->i_mutex);
2138 if (!err) {
efefb143 2139 shrink_dcache_sb(root->fs_info->sb);
76dda93c
YZ		 2140 btrfs_invalidate_inodes(dest);
2141 d_delete(dentry);
2142 }
2143out_dput:
2144 dput(dentry);
2145out_unlock_dir:
2146 mutex_unlock(&dir->i_mutex);
2a79f17e 2147 mnt_drop_write_file(file);
76dda93c
YZ		 2148out:
2149 kfree(vol_args);
2150 return err;
2151}
2152
1e701a32 2153static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
f46b5a66
CH		 2154{
2155 struct inode *inode = fdentry(file)->d_inode;
2156 struct btrfs_root *root = BTRFS_I(inode)->root;
1e701a32 2157 struct btrfs_ioctl_defrag_range_args *range;
c146afad
YZ		 2158 int ret;
2159
b83cc969
LZ		 2160 if (btrfs_root_readonly(root))
2161 return -EROFS;
2162
a561be71 2163 ret = mnt_want_write_file(file);
c146afad
YZ		 2164 if (ret)
2165 return ret;
f46b5a66
CH		 2166
2167 switch (inode->i_mode & S_IFMT) {
2168 case S_IFDIR:
e441d54d
CM		 2169 if (!capable(CAP_SYS_ADMIN)) {
2170 ret = -EPERM;
2171 goto out;
2172 }
8929ecfa
YZ		 2173 ret = btrfs_defrag_root(root, 0);
2174 if (ret)
2175 goto out;
2176 ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
f46b5a66
CH		 2177 break;
2178 case S_IFREG:
e441d54d
CM		 2179 if (!(file->f_mode & FMODE_WRITE)) {
2180 ret = -EINVAL;
2181 goto out;
2182 }
1e701a32
CM		 2183
2184 range = kzalloc(sizeof(*range), GFP_KERNEL);
2185 if (!range) {
2186 ret = -ENOMEM;
2187 goto out;
2188 }
2189
2190 if (argp) {
2191 if (copy_from_user(range, argp,
2192 sizeof(*range))) {
2193 ret = -EFAULT;
2194 kfree(range);
683be16e 2195 goto out;
1e701a32
CM		 2196 }
2197 /* compression requires us to start the IO */
2198 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2199 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2200 range->extent_thresh = (u32)-1;
2201 }
2202 } else {
2203 /* the rest are all set to zero by kzalloc */
2204 range->len = (u64)-1;
2205 }
4cb5300b
CM		 2206 ret = btrfs_defrag_file(fdentry(file)->d_inode, file,
2207 range, 0, 0);
2208 if (ret > 0)
2209 ret = 0;
1e701a32 2210 kfree(range);
f46b5a66 2211 break;
8929ecfa
YZ		 2212 default:
2213 ret = -EINVAL;
f46b5a66 2214 }
e441d54d 2215out:
2a79f17e 2216 mnt_drop_write_file(file);
e441d54d 2217 return ret;
f46b5a66
CH		 2218}
2219
b2950863 2220static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2221{
2222 struct btrfs_ioctl_vol_args *vol_args;
2223 int ret;
2224
e441d54d
CM		 2225 if (!capable(CAP_SYS_ADMIN))
2226 return -EPERM;
2227
c9e9f97b
ID		 2228 mutex_lock(&root->fs_info->volume_mutex);
2229 if (root->fs_info->balance_ctl) {
2230 printk(KERN_INFO "btrfs: balance in progress\n");
2231 ret = -EINVAL;
2232 goto out;
2233 }
2234
dae7b665 2235 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2236 if (IS_ERR(vol_args)) {
2237 ret = PTR_ERR(vol_args);
2238 goto out;
2239 }
f46b5a66 2240
5516e595 2241 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2242 ret = btrfs_init_new_device(root, vol_args->name);
2243
f46b5a66 2244 kfree(vol_args);
c9e9f97b
ID		 2245out:
2246 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 2247 return ret;
2248}
2249
b2950863 2250static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
f46b5a66
CH		 2251{
2252 struct btrfs_ioctl_vol_args *vol_args;
2253 int ret;
2254
e441d54d
CM		 2255 if (!capable(CAP_SYS_ADMIN))
2256 return -EPERM;
2257
c146afad
YZ		 2258 if (root->fs_info->sb->s_flags & MS_RDONLY)
2259 return -EROFS;
2260
c9e9f97b
ID		 2261 mutex_lock(&root->fs_info->volume_mutex);
2262 if (root->fs_info->balance_ctl) {
2263 printk(KERN_INFO "btrfs: balance in progress\n");
2264 ret = -EINVAL;
2265 goto out;
2266 }
2267
dae7b665 2268 vol_args = memdup_user(arg, sizeof(*vol_args));
c9e9f97b
ID		 2269 if (IS_ERR(vol_args)) {
2270 ret = PTR_ERR(vol_args);
2271 goto out;
2272 }
f46b5a66 2273
5516e595 2274 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
f46b5a66
CH		 2275 ret = btrfs_rm_device(root, vol_args->name);
2276
f46b5a66 2277 kfree(vol_args);
c9e9f97b
ID		 2278out:
2279 mutex_unlock(&root->fs_info->volume_mutex);
f46b5a66
CH		 2280 return ret;
2281}
2282
475f6387
JS		 2283static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2284{
027ed2f0 2285 struct btrfs_ioctl_fs_info_args *fi_args;
475f6387
JS		 2286 struct btrfs_device *device;
2287 struct btrfs_device *next;
2288 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
027ed2f0 2289 int ret = 0;
475f6387
JS		 2290
2291 if (!capable(CAP_SYS_ADMIN))
2292 return -EPERM;
2293
027ed2f0
LZ		 2294 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2295 if (!fi_args)
2296 return -ENOMEM;
2297
2298 fi_args->num_devices = fs_devices->num_devices;
2299 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
475f6387
JS		 2300
2301 mutex_lock(&fs_devices->device_list_mutex);
2302 list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
027ed2f0
LZ		 2303 if (device->devid > fi_args->max_id)
2304 fi_args->max_id = device->devid;
475f6387
JS		 2305 }
2306 mutex_unlock(&fs_devices->device_list_mutex);
2307
027ed2f0
LZ		 2308 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2309 ret = -EFAULT;
475f6387 2310
027ed2f0
LZ		 2311 kfree(fi_args);
2312 return ret;
475f6387
JS		 2313}
2314
2315static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2316{
2317 struct btrfs_ioctl_dev_info_args *di_args;
2318 struct btrfs_device *dev;
2319 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2320 int ret = 0;
2321 char *s_uuid = NULL;
2322 char empty_uuid[BTRFS_UUID_SIZE] = {0};
2323
2324 if (!capable(CAP_SYS_ADMIN))
2325 return -EPERM;
2326
2327 di_args = memdup_user(arg, sizeof(*di_args));
2328 if (IS_ERR(di_args))
2329 return PTR_ERR(di_args);
2330
2331 if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
2332 s_uuid = di_args->uuid;
2333
2334 mutex_lock(&fs_devices->device_list_mutex);
aa1b8cd4 2335 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
475f6387
JS		 2336 mutex_unlock(&fs_devices->device_list_mutex);
2337
2338 if (!dev) {
2339 ret = -ENODEV;
2340 goto out;
2341 }
2342
2343 di_args->devid = dev->devid;
2344 di_args->bytes_used = dev->bytes_used;
2345 di_args->total_bytes = dev->total_bytes;
2346 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
a27202fb 2347 if (dev->name) {
606686ee
JB		 2348 struct rcu_string *name;
2349
2350 rcu_read_lock();
2351 name = rcu_dereference(dev->name);
2352 strncpy(di_args->path, name->str, sizeof(di_args->path));
2353 rcu_read_unlock();
a27202fb
JM		 2354 di_args->path[sizeof(di_args->path) - 1] = 0;
2355 } else {
99ba55ad 2356 di_args->path[0] = '\0';
a27202fb 2357 }
475f6387
JS		 2358
2359out:
2360 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2361 ret = -EFAULT;
2362
2363 kfree(di_args);
2364 return ret;
2365}
2366
76dda93c
YZ		 2367static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
2368 u64 off, u64 olen, u64 destoff)
f46b5a66
CH		 2369{
2370 struct inode *inode = fdentry(file)->d_inode;
2371 struct btrfs_root *root = BTRFS_I(inode)->root;
2903ff01 2372 struct fd src_file;
f46b5a66
CH		 2373 struct inode *src;
2374 struct btrfs_trans_handle *trans;
f46b5a66 2375 struct btrfs_path *path;
f46b5a66 2376 struct extent_buffer *leaf;
ae01a0ab
YZ		 2377 char *buf;
2378 struct btrfs_key key;
f46b5a66
CH		 2379 u32 nritems;
2380 int slot;
ae01a0ab 2381 int ret;
c5c9cd4d
SW		 2382 u64 len = olen;
2383 u64 bs = root->fs_info->sb->s_blocksize;
d20f7043 2384
c5c9cd4d
SW		 2385 /*
2386 * TODO:
2387 * - split compressed inline extents. annoying: we need to
2388 * decompress into destination's address_space (the file offset
2389 * may change, so source mapping won't do), then recompress (or
2390 * otherwise reinsert) a subrange.
2391 * - allow ranges within the same file to be cloned (provided
2392 * they don't overlap)?
2393 */
2394
e441d54d 2395 /* the destination must be opened for writing */
2ebc3464 2396 if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND))
e441d54d
CM		 2397 return -EINVAL;
2398
b83cc969
LZ		 2399 if (btrfs_root_readonly(root))
2400 return -EROFS;
2401
a561be71 2402 ret = mnt_want_write_file(file);
c146afad
YZ		 2403 if (ret)
2404 return ret;
2405
2903ff01
AV		 2406 src_file = fdget(srcfd);
2407 if (!src_file.file) {
ab67b7c1
YZ		 2408 ret = -EBADF;
2409 goto out_drop_write;
2410 }
5dc64164 2411
362a20c5 2412 ret = -EXDEV;
2903ff01 2413 if (src_file.file->f_path.mnt != file->f_path.mnt)
362a20c5
DS		 2414 goto out_fput;
2415
2903ff01 2416 src = src_file.file->f_dentry->d_inode;
f46b5a66 2417
c5c9cd4d
SW		 2418 ret = -EINVAL;
2419 if (src == inode)
2420 goto out_fput;
2421
5dc64164 2422 /* the src must be open for reading */
2903ff01 2423 if (!(src_file.file->f_mode & FMODE_READ))
5dc64164
DR		 2424 goto out_fput;
2425
0e7b824c
LZ		 2426 /* don't make the dst file partly checksummed */
2427 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
2428 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
2429 goto out_fput;
2430
ae01a0ab
YZ		 2431 ret = -EISDIR;
2432 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
2433 goto out_fput;
2434
f46b5a66 2435 ret = -EXDEV;
362a20c5 2436 if (src->i_sb != inode->i_sb)
ae01a0ab
YZ		 2437 goto out_fput;
2438
2439 ret = -ENOMEM;
2440 buf = vmalloc(btrfs_level_size(root, 0));
2441 if (!buf)
2442 goto out_fput;
2443
2444 path = btrfs_alloc_path();
2445 if (!path) {
2446 vfree(buf);
f46b5a66 2447 goto out_fput;
ae01a0ab
YZ		 2448 }
2449 path->reada = 2;
f46b5a66
CH		 2450
2451 if (inode < src) {
fccdae43
SW		 2452 mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT);
2453 mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD);
f46b5a66 2454 } else {
fccdae43
SW		 2455 mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT);
2456 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
f46b5a66
CH		 2457 }
2458
c5c9cd4d
SW		 2459 /* determine range to clone */
2460 ret = -EINVAL;
2ebc3464 2461 if (off + len > src->i_size || off + len < off)
f46b5a66 2462 goto out_unlock;
c5c9cd4d
SW		 2463 if (len == 0)
2464 olen = len = src->i_size - off;
2465 /* if we extend to eof, continue to block boundary */
2466 if (off + len == src->i_size)
2a6b8dae 2467 len = ALIGN(src->i_size, bs) - off;
c5c9cd4d
SW		 2468
2469 /* verify the end result is block aligned */
2a6b8dae
LZ		 2470 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
2471 !IS_ALIGNED(destoff, bs))
c5c9cd4d
SW		 2472 goto out_unlock;
2473
d525e8ab
LZ		 2474 if (destoff > inode->i_size) {
2475 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
2476 if (ret)
2477 goto out_unlock;
2478 }
2479
71ef0786
LZ		 2480 /* truncate page cache pages from target inode range */
2481 truncate_inode_pages_range(&inode->i_data, destoff,
2482 PAGE_CACHE_ALIGN(destoff + len) - 1);
2483
f46b5a66
CH		 2484 /* do any pending delalloc/csum calc on src, one way or
2485 another, and lock file content */
2486 while (1) {
31840ae1 2487 struct btrfs_ordered_extent *ordered;
aa42ffd9
LB		 2488 lock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
2489 ordered = btrfs_lookup_first_ordered_extent(src, off + len - 1);
9a019196 2490 if (!ordered &&
aa42ffd9
LB		 2491 !test_range_bit(&BTRFS_I(src)->io_tree, off, off + len - 1,
2492 EXTENT_DELALLOC, 0, NULL))
f46b5a66 2493 break;
aa42ffd9 2494 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
ae01a0ab
YZ		 2495 if (ordered)
2496 btrfs_put_ordered_extent(ordered);
9a019196 2497 btrfs_wait_ordered_range(src, off, len);
f46b5a66
CH		 2498 }
2499
c5c9cd4d 2500 /* clone data */
33345d01 2501 key.objectid = btrfs_ino(src);
ae01a0ab
YZ		 2502 key.type = BTRFS_EXTENT_DATA_KEY;
2503 key.offset = 0;
f46b5a66
CH		 2504
2505 while (1) {
2506 /*
2507 * note the key will change type as we walk through the
2508 * tree.
2509 */
362a20c5
DS		 2510 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
2511 0, 0);
f46b5a66
CH		 2512 if (ret < 0)
2513 goto out;
2514
ae01a0ab
YZ		 2515 nritems = btrfs_header_nritems(path->nodes[0]);
2516 if (path->slots[0] >= nritems) {
362a20c5 2517 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
f46b5a66
CH		 2518 if (ret < 0)
2519 goto out;
2520 if (ret > 0)
2521 break;
ae01a0ab 2522 nritems = btrfs_header_nritems(path->nodes[0]);
f46b5a66
CH		 2523 }
2524 leaf = path->nodes[0];
2525 slot = path->slots[0];
f46b5a66 2526
ae01a0ab 2527 btrfs_item_key_to_cpu(leaf, &key, slot);
d20f7043 2528 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
33345d01 2529 key.objectid != btrfs_ino(src))
f46b5a66
CH		 2530 break;
2531
c5c9cd4d
SW		 2532 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
2533 struct btrfs_file_extent_item *extent;
2534 int type;
31840ae1
ZY		 2535 u32 size;
2536 struct btrfs_key new_key;
c5c9cd4d
SW		 2537 u64 disko = 0, diskl = 0;
2538 u64 datao = 0, datal = 0;
2539 u8 comp;
b5384d48 2540 u64 endoff;
31840ae1
ZY		 2541
2542 size = btrfs_item_size_nr(leaf, slot);
2543 read_extent_buffer(leaf, buf,
2544 btrfs_item_ptr_offset(leaf, slot),
2545 size);
c5c9cd4d
SW		 2546
2547 extent = btrfs_item_ptr(leaf, slot,
2548 struct btrfs_file_extent_item);
2549 comp = btrfs_file_extent_compression(leaf, extent);
2550 type = btrfs_file_extent_type(leaf, extent);
c8a894d7
CM		 2551 if (type == BTRFS_FILE_EXTENT_REG ||
2552 type == BTRFS_FILE_EXTENT_PREALLOC) {
d397712b
CM		 2553 disko = btrfs_file_extent_disk_bytenr(leaf,
2554 extent);
2555 diskl = btrfs_file_extent_disk_num_bytes(leaf,
2556 extent);
c5c9cd4d 2557 datao = btrfs_file_extent_offset(leaf, extent);
d397712b
CM		 2558 datal = btrfs_file_extent_num_bytes(leaf,
2559 extent);
c5c9cd4d
SW		 2560 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2561 /* take upper bound, may be compressed */
2562 datal = btrfs_file_extent_ram_bytes(leaf,
2563 extent);
2564 }
b3b4aa74 2565 btrfs_release_path(path);
31840ae1 2566
050006a7 2567 if (key.offset + datal <= off ||
aa42ffd9 2568 key.offset >= off + len - 1)
c5c9cd4d
SW		 2569 goto next;
2570
31840ae1 2571 memcpy(&new_key, &key, sizeof(new_key));
33345d01 2572 new_key.objectid = btrfs_ino(inode);
4d728ec7
LZ		 2573 if (off <= key.offset)
2574 new_key.offset = key.offset + destoff - off;
2575 else
2576 new_key.offset = destoff;
31840ae1 2577
b6f3409b
SW		 2578 /*
2579 * 1 - adjusting old extent (we may have to split it)
2580 * 1 - add new extent
2581 * 1 - inode update
2582 */
2583 trans = btrfs_start_transaction(root, 3);
a22285a6
YZ		 2584 if (IS_ERR(trans)) {
2585 ret = PTR_ERR(trans);
2586 goto out;
2587 }
2588
c8a894d7
CM		 2589 if (type == BTRFS_FILE_EXTENT_REG ||
2590 type == BTRFS_FILE_EXTENT_PREALLOC) {
d72c0842
LZ		 2591 /*
2592 * a | --- range to clone ---| b
2593 * | ------------- extent ------------- |
2594 */
2595
2596 /* substract range b */
2597 if (key.offset + datal > off + len)
2598 datal = off + len - key.offset;
2599
2600 /* substract range a */
a22285a6
YZ		 2601 if (off > key.offset) {
2602 datao += off - key.offset;
2603 datal -= off - key.offset;
2604 }
2605
5dc562c5 2606 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2607 new_key.offset,
2608 new_key.offset + datal,
2671485d 2609 1);
79787eaa
JM		 2610 if (ret) {
2611 btrfs_abort_transaction(trans, root,
2612 ret);
2613 btrfs_end_transaction(trans, root);
2614 goto out;
2615 }
a22285a6 2616
c5c9cd4d
SW		 2617 ret = btrfs_insert_empty_item(trans, root, path,
2618 &new_key, size);
79787eaa
JM		 2619 if (ret) {
2620 btrfs_abort_transaction(trans, root,
2621 ret);
2622 btrfs_end_transaction(trans, root);
2623 goto out;
2624 }
c5c9cd4d
SW		 2625
2626 leaf = path->nodes[0];
2627 slot = path->slots[0];
2628 write_extent_buffer(leaf, buf,
31840ae1
ZY		 2629 btrfs_item_ptr_offset(leaf, slot),
2630 size);
ae01a0ab 2631
c5c9cd4d 2632 extent = btrfs_item_ptr(leaf, slot,
f46b5a66 2633 struct btrfs_file_extent_item);
c5c9cd4d 2634
c5c9cd4d
SW		 2635 /* disko == 0 means it's a hole */
2636 if (!disko)
2637 datao = 0;
c5c9cd4d
SW		 2638
2639 btrfs_set_file_extent_offset(leaf, extent,
2640 datao);
2641 btrfs_set_file_extent_num_bytes(leaf, extent,
2642 datal);
2643 if (disko) {
2644 inode_add_bytes(inode, datal);
ae01a0ab 2645 ret = btrfs_inc_extent_ref(trans, root,
5d4f98a2
YZ		 2646 disko, diskl, 0,
2647 root->root_key.objectid,
33345d01 2648 btrfs_ino(inode),
66d7e7f0
AJ		 2649 new_key.offset - datao,
2650 0);
79787eaa
JM		 2651 if (ret) {
2652 btrfs_abort_transaction(trans,
2653 root,
2654 ret);
2655 btrfs_end_transaction(trans,
2656 root);
2657 goto out;
2658
2659 }
f46b5a66 2660 }
c5c9cd4d
SW		 2661 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
2662 u64 skip = 0;
2663 u64 trim = 0;
2664 if (off > key.offset) {
2665 skip = off - key.offset;
2666 new_key.offset += skip;
2667 }
d397712b 2668
aa42ffd9
LB		 2669 if (key.offset + datal > off + len)
2670 trim = key.offset + datal - (off + len);
d397712b 2671
c5c9cd4d 2672 if (comp && (skip || trim)) {
c5c9cd4d 2673 ret = -EINVAL;
a22285a6 2674 btrfs_end_transaction(trans, root);
c5c9cd4d
SW		 2675 goto out;
2676 }
2677 size -= skip + trim;
2678 datal -= skip + trim;
a22285a6 2679
5dc562c5 2680 ret = btrfs_drop_extents(trans, root, inode,
a22285a6
YZ		 2681 new_key.offset,
2682 new_key.offset + datal,
2671485d 2683 1);
79787eaa
JM		 2684 if (ret) {
2685 btrfs_abort_transaction(trans, root,
2686 ret);
2687 btrfs_end_transaction(trans, root);
2688 goto out;
2689 }
a22285a6 2690
c5c9cd4d
SW		 2691 ret = btrfs_insert_empty_item(trans, root, path,
2692 &new_key, size);
79787eaa
JM		 2693 if (ret) {
2694 btrfs_abort_transaction(trans, root,
2695 ret);
2696 btrfs_end_transaction(trans, root);
2697 goto out;
2698 }
c5c9cd4d
SW		 2699
2700 if (skip) {
d397712b
CM		 2701 u32 start =
2702 btrfs_file_extent_calc_inline_size(0);
c5c9cd4d
SW		 2703 memmove(buf+start, buf+start+skip,
2704 datal);
2705 }
2706
2707 leaf = path->nodes[0];
2708 slot = path->slots[0];
2709 write_extent_buffer(leaf, buf,
2710 btrfs_item_ptr_offset(leaf, slot),
2711 size);
2712 inode_add_bytes(inode, datal);
f46b5a66 2713 }
c5c9cd4d
SW		 2714
2715 btrfs_mark_buffer_dirty(leaf);
b3b4aa74 2716 btrfs_release_path(path);
c5c9cd4d 2717
0c4d2d95 2718 inode_inc_iversion(inode);
a22285a6 2719 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
b5384d48
SW		 2720
2721 /*
2722 * we round up to the block size at eof when
2723 * determining which extents to clone above,
2724 * but shouldn't round up the file size
2725 */
2726 endoff = new_key.offset + datal;
5f3888ff
LZ		 2727 if (endoff > destoff+olen)
2728 endoff = destoff+olen;
b5384d48
SW		 2729 if (endoff > inode->i_size)
2730 btrfs_i_size_write(inode, endoff);
2731
a22285a6 2732 ret = btrfs_update_inode(trans, root, inode);
79787eaa
JM		 2733 if (ret) {
2734 btrfs_abort_transaction(trans, root, ret);
2735 btrfs_end_transaction(trans, root);
2736 goto out;
2737 }
2738 ret = btrfs_end_transaction(trans, root);
a22285a6 2739 }
d397712b 2740next:
b3b4aa74 2741 btrfs_release_path(path);
f46b5a66 2742 key.offset++;
f46b5a66 2743 }
f46b5a66
CH		 2744 ret = 0;
2745out:
b3b4aa74 2746 btrfs_release_path(path);
aa42ffd9 2747 unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
f46b5a66
CH		 2748out_unlock:
2749 mutex_unlock(&src->i_mutex);
2750 mutex_unlock(&inode->i_mutex);
ae01a0ab
YZ		 2751 vfree(buf);
2752 btrfs_free_path(path);
f46b5a66 2753out_fput:
2903ff01 2754 fdput(src_file);
ab67b7c1 2755out_drop_write:
2a79f17e 2756 mnt_drop_write_file(file);
f46b5a66
CH		 2757 return ret;
2758}
2759
7a865e8a 2760static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
c5c9cd4d
SW		 2761{
2762 struct btrfs_ioctl_clone_range_args args;
2763
7a865e8a 2764 if (copy_from_user(&args, argp, sizeof(args)))
c5c9cd4d
SW		 2765 return -EFAULT;
2766 return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
2767 args.src_length, args.dest_offset);
2768}
2769
f46b5a66
CH		 2770/*
2771 * there are many ways the trans_start and trans_end ioctls can lead
2772 * to deadlocks. They should only be used by applications that
2773 * basically own the machine, and have a very in depth understanding
2774 * of all the possible deadlocks and enospc problems.
2775 */
b2950863 2776static long btrfs_ioctl_trans_start(struct file *file)
f46b5a66
CH		 2777{
2778 struct inode *inode = fdentry(file)->d_inode;
2779 struct btrfs_root *root = BTRFS_I(inode)->root;
2780 struct btrfs_trans_handle *trans;
1ab86aed 2781 int ret;
f46b5a66 2782
1ab86aed 2783 ret = -EPERM;
df5b5520 2784 if (!capable(CAP_SYS_ADMIN))
1ab86aed 2785 goto out;
df5b5520 2786
1ab86aed
SW		 2787 ret = -EINPROGRESS;
2788 if (file->private_data)
f46b5a66 2789 goto out;
9ca9ee09 2790
b83cc969
LZ		 2791 ret = -EROFS;
2792 if (btrfs_root_readonly(root))
2793 goto out;
2794
a561be71 2795 ret = mnt_want_write_file(file);
c146afad
YZ		 2796 if (ret)
2797 goto out;
2798
a4abeea4 2799 atomic_inc(&root->fs_info->open_ioctl_trans);
9ca9ee09 2800
1ab86aed 2801 ret = -ENOMEM;
7a7eaa40 2802 trans = btrfs_start_ioctl_transaction(root);
abd30bb0 2803 if (IS_ERR(trans))
1ab86aed
SW		 2804 goto out_drop;
2805
2806 file->private_data = trans;
2807 return 0;
2808
2809out_drop:
a4abeea4 2810 atomic_dec(&root->fs_info->open_ioctl_trans);
2a79f17e 2811 mnt_drop_write_file(file);
f46b5a66 2812out:
f46b5a66
CH		 2813 return ret;
2814}
2815
6ef5ed0d
JB		 2816static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
2817{
2818 struct inode *inode = fdentry(file)->d_inode;
2819 struct btrfs_root *root = BTRFS_I(inode)->root;
2820 struct btrfs_root *new_root;
2821 struct btrfs_dir_item *di;
2822 struct btrfs_trans_handle *trans;
2823 struct btrfs_path *path;
2824 struct btrfs_key location;
2825 struct btrfs_disk_key disk_key;
6ef5ed0d
JB		 2826 u64 objectid = 0;
2827 u64 dir_id;
2828
2829 if (!capable(CAP_SYS_ADMIN))
2830 return -EPERM;
2831
2832 if (copy_from_user(&objectid, argp, sizeof(objectid)))
2833 return -EFAULT;
2834
2835 if (!objectid)
2836 objectid = root->root_key.objectid;
2837
2838 location.objectid = objectid;
2839 location.type = BTRFS_ROOT_ITEM_KEY;
2840 location.offset = (u64)-1;
2841
2842 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
2843 if (IS_ERR(new_root))
2844 return PTR_ERR(new_root);
2845
2846 if (btrfs_root_refs(&new_root->root_item) == 0)
2847 return -ENOENT;
2848
2849 path = btrfs_alloc_path();
2850 if (!path)
2851 return -ENOMEM;
2852 path->leave_spinning = 1;
2853
2854 trans = btrfs_start_transaction(root, 1);
98d5dc13 2855 if (IS_ERR(trans)) {
6ef5ed0d 2856 btrfs_free_path(path);
98d5dc13 2857 return PTR_ERR(trans);
6ef5ed0d
JB		 2858 }
2859
6c41761f 2860 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
6ef5ed0d
JB		 2861 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
2862 dir_id, "default", 7, 1);
cf1e99a4 2863 if (IS_ERR_OR_NULL(di)) {
6ef5ed0d
JB		 2864 btrfs_free_path(path);
2865 btrfs_end_transaction(trans, root);
2866 printk(KERN_ERR "Umm, you don't have the default dir item, "
2867 "this isn't going to work\n");
2868 return -ENOENT;
2869 }
2870
2871 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
2872 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
2873 btrfs_mark_buffer_dirty(path->nodes[0]);
2874 btrfs_free_path(path);
2875
2b0ce2c2 2876 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
6ef5ed0d
JB		 2877 btrfs_end_transaction(trans, root);
2878
2879 return 0;
2880}
2881
5af3e8cc
SB		 2882void btrfs_get_block_group_info(struct list_head *groups_list,
2883 struct btrfs_ioctl_space_info *space)
bf5fc093
JB		 2884{
2885 struct btrfs_block_group_cache *block_group;
2886
2887 space->total_bytes = 0;
2888 space->used_bytes = 0;
2889 space->flags = 0;
2890 list_for_each_entry(block_group, groups_list, list) {
2891 space->flags = block_group->flags;
2892 space->total_bytes += block_group->key.offset;
2893 space->used_bytes +=
2894 btrfs_block_group_used(&block_group->item);
2895 }
2896}
2897
1406e432
JB		 2898long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
2899{
2900 struct btrfs_ioctl_space_args space_args;
2901 struct btrfs_ioctl_space_info space;
2902 struct btrfs_ioctl_space_info *dest;
7fde62bf 2903 struct btrfs_ioctl_space_info *dest_orig;
13f2696f 2904 struct btrfs_ioctl_space_info __user *user_dest;
1406e432 2905 struct btrfs_space_info *info;
bf5fc093
JB		 2906 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
2907 BTRFS_BLOCK_GROUP_SYSTEM,
2908 BTRFS_BLOCK_GROUP_METADATA,
2909 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
2910 int num_types = 4;
7fde62bf 2911 int alloc_size;
1406e432 2912 int ret = 0;
51788b1b 2913 u64 slot_count = 0;
bf5fc093 2914 int i, c;
1406e432
JB		 2915
2916 if (copy_from_user(&space_args,
2917 (struct btrfs_ioctl_space_args __user *)arg,
2918 sizeof(space_args)))
2919 return -EFAULT;
2920
bf5fc093
JB		 2921 for (i = 0; i < num_types; i++) {
2922 struct btrfs_space_info *tmp;
2923
2924 info = NULL;
2925 rcu_read_lock();
2926 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2927 list) {
2928 if (tmp->flags == types[i]) {
2929 info = tmp;
2930 break;
2931 }
2932 }
2933 rcu_read_unlock();
2934
2935 if (!info)
2936 continue;
2937
2938 down_read(&info->groups_sem);
2939 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
2940 if (!list_empty(&info->block_groups[c]))
2941 slot_count++;
2942 }
2943 up_read(&info->groups_sem);
2944 }
7fde62bf
CM		 2945
2946 /* space_slots == 0 means they are asking for a count */
2947 if (space_args.space_slots == 0) {
2948 space_args.total_spaces = slot_count;
2949 goto out;
2950 }
bf5fc093 2951
51788b1b 2952 slot_count = min_t(u64, space_args.space_slots, slot_count);
bf5fc093 2953
7fde62bf 2954 alloc_size = sizeof(*dest) * slot_count;
bf5fc093 2955
7fde62bf
CM		 2956 /* we generally have at most 6 or so space infos, one for each raid
2957 * level. So, a whole page should be more than enough for everyone
2958 */
2959 if (alloc_size > PAGE_CACHE_SIZE)
2960 return -ENOMEM;
2961
1406e432 2962 space_args.total_spaces = 0;
7fde62bf
CM		 2963 dest = kmalloc(alloc_size, GFP_NOFS);
2964 if (!dest)
2965 return -ENOMEM;
2966 dest_orig = dest;
1406e432 2967
7fde62bf 2968 /* now we have a buffer to copy into */
bf5fc093
JB		 2969 for (i = 0; i < num_types; i++) {
2970 struct btrfs_space_info *tmp;
2971
51788b1b
DR		 2972 if (!slot_count)
2973 break;
2974
bf5fc093
JB		 2975 info = NULL;
2976 rcu_read_lock();
2977 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
2978 list) {
2979 if (tmp->flags == types[i]) {
2980 info = tmp;
2981 break;
2982 }
2983 }
2984 rcu_read_unlock();
7fde62bf 2985
bf5fc093
JB		 2986 if (!info)
2987 continue;
2988 down_read(&info->groups_sem);
2989 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
2990 if (!list_empty(&info->block_groups[c])) {
5af3e8cc
SB		 2991 btrfs_get_block_group_info(
2992 &info->block_groups[c], &space);
bf5fc093
JB		 2993 memcpy(dest, &space, sizeof(space));
2994 dest++;
2995 space_args.total_spaces++;
51788b1b 2996 slot_count--;
bf5fc093 2997 }
51788b1b
DR		 2998 if (!slot_count)
2999 break;
bf5fc093
JB		 3000 }
3001 up_read(&info->groups_sem);
1406e432 3002 }
1406e432 3003
2eec6c81 3004 user_dest = (struct btrfs_ioctl_space_info __user *)
7fde62bf
CM		 3005 (arg + sizeof(struct btrfs_ioctl_space_args));
3006
3007 if (copy_to_user(user_dest, dest_orig, alloc_size))
3008 ret = -EFAULT;
3009
3010 kfree(dest_orig);
3011out:
3012 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
1406e432
JB		 3013 ret = -EFAULT;
3014
3015 return ret;
3016}
3017
f46b5a66
CH		 3018/*
3019 * there are many ways the trans_start and trans_end ioctls can lead
3020 * to deadlocks. They should only be used by applications that
3021 * basically own the machine, and have a very in depth understanding
3022 * of all the possible deadlocks and enospc problems.
3023 */
3024long btrfs_ioctl_trans_end(struct file *file)
3025{
3026 struct inode *inode = fdentry(file)->d_inode;
3027 struct btrfs_root *root = BTRFS_I(inode)->root;
3028 struct btrfs_trans_handle *trans;
f46b5a66 3029
f46b5a66 3030 trans = file->private_data;
1ab86aed
SW		 3031 if (!trans)
3032 return -EINVAL;
b214107e 3033 file->private_data = NULL;
9ca9ee09 3034
1ab86aed
SW		 3035 btrfs_end_transaction(trans, root);
3036
a4abeea4 3037 atomic_dec(&root->fs_info->open_ioctl_trans);
9ca9ee09 3038
2a79f17e 3039 mnt_drop_write_file(file);
1ab86aed 3040 return 0;
f46b5a66
CH		 3041}
3042
46204592
SW		 3043static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp)
3044{
3045 struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
3046 struct btrfs_trans_handle *trans;
3047 u64 transid;
db5b493a 3048 int ret;
46204592
SW		 3049
3050 trans = btrfs_start_transaction(root, 0);
98d5dc13
TI		 3051 if (IS_ERR(trans))
3052 return PTR_ERR(trans);
46204592 3053 transid = trans->transid;
db5b493a 3054 ret = btrfs_commit_transaction_async(trans, root, 0);
8b2b2d3c
TI		 3055 if (ret) {
3056 btrfs_end_transaction(trans, root);
db5b493a 3057 return ret;
8b2b2d3c 3058 }
46204592
SW		 3059
3060 if (argp)
3061 if (copy_to_user(argp, &transid, sizeof(transid)))
3062 return -EFAULT;
3063 return 0;
3064}
3065
3066static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp)
3067{
3068 struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root;
3069 u64 transid;
3070
3071 if (argp) {
3072 if (copy_from_user(&transid, argp, sizeof(transid)))
3073 return -EFAULT;
3074 } else {
3075 transid = 0; /* current trans */
3076 }
3077 return btrfs_wait_for_commit(root, transid);
3078}
3079
475f6387
JS		 3080static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg)
3081{
3082 int ret;
3083 struct btrfs_ioctl_scrub_args *sa;
3084
3085 if (!capable(CAP_SYS_ADMIN))
3086 return -EPERM;
3087
3088 sa = memdup_user(arg, sizeof(*sa));
3089 if (IS_ERR(sa))
3090 return PTR_ERR(sa);
3091
aa1b8cd4 3092 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
8628764e 3093 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY);
475f6387
JS		 3094
3095 if (copy_to_user(arg, sa, sizeof(*sa)))
3096 ret = -EFAULT;
3097
3098 kfree(sa);
3099 return ret;
3100}
3101
3102static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
3103{
3104 if (!capable(CAP_SYS_ADMIN))
3105 return -EPERM;
3106
aa1b8cd4 3107 return btrfs_scrub_cancel(root->fs_info);
475f6387
JS		 3108}
3109
3110static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
3111 void __user *arg)
3112{
3113 struct btrfs_ioctl_scrub_args *sa;
3114 int ret;
3115
3116 if (!capable(CAP_SYS_ADMIN))
3117 return -EPERM;
3118
3119 sa = memdup_user(arg, sizeof(*sa));
3120 if (IS_ERR(sa))
3121 return PTR_ERR(sa);
3122
3123 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
3124
3125 if (copy_to_user(arg, sa, sizeof(*sa)))
3126 ret = -EFAULT;
3127
3128 kfree(sa);
3129 return ret;
3130}
3131
c11d2c23 3132static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
b27f7c0c 3133 void __user *arg)
c11d2c23
SB		 3134{
3135 struct btrfs_ioctl_get_dev_stats *sa;
3136 int ret;
3137
c11d2c23
SB		 3138 sa = memdup_user(arg, sizeof(*sa));
3139 if (IS_ERR(sa))
3140 return PTR_ERR(sa);
3141
b27f7c0c
DS		 3142 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3143 kfree(sa);
3144 return -EPERM;
3145 }
3146
3147 ret = btrfs_get_dev_stats(root, sa);
c11d2c23
SB		 3148
3149 if (copy_to_user(arg, sa, sizeof(*sa)))
3150 ret = -EFAULT;
3151
3152 kfree(sa);
3153 return ret;
3154}
3155
d7728c96
JS		 3156static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3157{
3158 int ret = 0;
3159 int i;
740c3d22 3160 u64 rel_ptr;
d7728c96 3161 int size;
806468f8 3162 struct btrfs_ioctl_ino_path_args *ipa = NULL;
d7728c96
JS		 3163 struct inode_fs_paths *ipath = NULL;
3164 struct btrfs_path *path;
3165
3166 if (!capable(CAP_SYS_ADMIN))
3167 return -EPERM;
3168
3169 path = btrfs_alloc_path();
3170 if (!path) {
3171 ret = -ENOMEM;
3172 goto out;
3173 }
3174
3175 ipa = memdup_user(arg, sizeof(*ipa));
3176 if (IS_ERR(ipa)) {
3177 ret = PTR_ERR(ipa);
3178 ipa = NULL;
3179 goto out;
3180 }
3181
3182 size = min_t(u32, ipa->size, 4096);
3183 ipath = init_ipath(size, root, path);
3184 if (IS_ERR(ipath)) {
3185 ret = PTR_ERR(ipath);
3186 ipath = NULL;
3187 goto out;
3188 }
3189
3190 ret = paths_from_inode(ipa->inum, ipath);
3191 if (ret < 0)
3192 goto out;
3193
3194 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
745c4d8e
JM		 3195 rel_ptr = ipath->fspath->val[i] -
3196 (u64)(unsigned long)ipath->fspath->val;
740c3d22 3197 ipath->fspath->val[i] = rel_ptr;
d7728c96
JS		 3198 }
3199
745c4d8e
JM		 3200 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
3201 (void *)(unsigned long)ipath->fspath, size);
d7728c96
JS		 3202 if (ret) {
3203 ret = -EFAULT;
3204 goto out;
3205 }
3206
3207out:
3208 btrfs_free_path(path);
3209 free_ipath(ipath);
3210 kfree(ipa);
3211
3212 return ret;
3213}
3214
3215static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3216{
3217 struct btrfs_data_container *inodes = ctx;
3218 const size_t c = 3 * sizeof(u64);
3219
3220 if (inodes->bytes_left >= c) {
3221 inodes->bytes_left -= c;
3222 inodes->val[inodes->elem_cnt] = inum;
3223 inodes->val[inodes->elem_cnt + 1] = offset;
3224 inodes->val[inodes->elem_cnt + 2] = root;
3225 inodes->elem_cnt += 3;
3226 } else {
3227 inodes->bytes_missing += c - inodes->bytes_left;
3228 inodes->bytes_left = 0;
3229 inodes->elem_missed += 3;
3230 }
3231
3232 return 0;
3233}
3234
3235static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
3236 void __user *arg)
3237{
3238 int ret = 0;
3239 int size;
d7728c96
JS		 3240 struct btrfs_ioctl_logical_ino_args *loi;
3241 struct btrfs_data_container *inodes = NULL;
3242 struct btrfs_path *path = NULL;
d7728c96
JS		 3243
3244 if (!capable(CAP_SYS_ADMIN))
3245 return -EPERM;
3246
3247 loi = memdup_user(arg, sizeof(*loi));
3248 if (IS_ERR(loi)) {
3249 ret = PTR_ERR(loi);
3250 loi = NULL;
3251 goto out;
3252 }
3253
3254 path = btrfs_alloc_path();
3255 if (!path) {
3256 ret = -ENOMEM;
3257 goto out;
3258 }
3259
425d17a2 3260 size = min_t(u32, loi->size, 64 * 1024);
d7728c96
JS		 3261 inodes = init_data_container(size);
3262 if (IS_ERR(inodes)) {
3263 ret = PTR_ERR(inodes);
3264 inodes = NULL;
3265 goto out;
3266 }
3267
df031f07
LB		 3268 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
3269 build_ino_list, inodes);
3270 if (ret == -EINVAL)
d7728c96
JS		 3271 ret = -ENOENT;
3272 if (ret < 0)
3273 goto out;
3274
745c4d8e
JM		 3275 ret = copy_to_user((void *)(unsigned long)loi->inodes,
3276 (void *)(unsigned long)inodes, size);
d7728c96
JS		 3277 if (ret)
3278 ret = -EFAULT;
3279
3280out:
3281 btrfs_free_path(path);
425d17a2 3282 vfree(inodes);
d7728c96
JS		 3283 kfree(loi);
3284
3285 return ret;
3286}
3287
19a39dce 3288void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
c9e9f97b
ID		 3289 struct btrfs_ioctl_balance_args *bargs)
3290{
3291 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3292
3293 bargs->flags = bctl->flags;
3294
837d5b6e
ID		 3295 if (atomic_read(&fs_info->balance_running))
3296 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3297 if (atomic_read(&fs_info->balance_pause_req))
3298 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
a7e99c69
ID		 3299 if (atomic_read(&fs_info->balance_cancel_req))
3300 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
837d5b6e 3301
c9e9f97b
ID		 3302 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3303 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3304 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
19a39dce
ID		 3305
3306 if (lock) {
3307 spin_lock(&fs_info->balance_lock);
3308 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3309 spin_unlock(&fs_info->balance_lock);
3310 } else {
3311 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3312 }
c9e9f97b
ID		 3313}
3314
9ba1f6e4 3315static long btrfs_ioctl_balance(struct file *file, void __user *arg)
c9e9f97b 3316{
9ba1f6e4 3317 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
c9e9f97b
ID		 3318 struct btrfs_fs_info *fs_info = root->fs_info;
3319 struct btrfs_ioctl_balance_args *bargs;
3320 struct btrfs_balance_control *bctl;
3321 int ret;
3322
3323 if (!capable(CAP_SYS_ADMIN))
3324 return -EPERM;
3325
e54bfa31 3326 ret = mnt_want_write_file(file);
9ba1f6e4
LB		 3327 if (ret)
3328 return ret;
3329
c9e9f97b
ID		 3330 mutex_lock(&fs_info->volume_mutex);
3331 mutex_lock(&fs_info->balance_mutex);
3332
3333 if (arg) {
3334 bargs = memdup_user(arg, sizeof(*bargs));
3335 if (IS_ERR(bargs)) {
3336 ret = PTR_ERR(bargs);
3337 goto out;
3338 }
de322263
ID		 3339
3340 if (bargs->flags & BTRFS_BALANCE_RESUME) {
3341 if (!fs_info->balance_ctl) {
3342 ret = -ENOTCONN;
3343 goto out_bargs;
3344 }
3345
3346 bctl = fs_info->balance_ctl;
3347 spin_lock(&fs_info->balance_lock);
3348 bctl->flags |= BTRFS_BALANCE_RESUME;
3349 spin_unlock(&fs_info->balance_lock);
3350
3351 goto do_balance;
3352 }
c9e9f97b
ID		 3353 } else {
3354 bargs = NULL;
3355 }
3356
837d5b6e
ID		 3357 if (fs_info->balance_ctl) {
3358 ret = -EINPROGRESS;
3359 goto out_bargs;
3360 }
3361
c9e9f97b
ID		 3362 bctl = kzalloc(sizeof(*bctl), GFP_NOFS);
3363 if (!bctl) {
3364 ret = -ENOMEM;
3365 goto out_bargs;
3366 }
3367
3368 bctl->fs_info = fs_info;
3369 if (arg) {
3370 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
3371 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
3372 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
3373
3374 bctl->flags = bargs->flags;
f43ffb60
ID		 3375 } else {
3376 /* balance everything - no filters */
3377 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
c9e9f97b
ID		 3378 }
3379
de322263 3380do_balance:
c9e9f97b
ID		 3381 ret = btrfs_balance(bctl, bargs);
3382 /*
837d5b6e
ID		 3383 * bctl is freed in __cancel_balance or in free_fs_info if
3384 * restriper was paused all the way until unmount
c9e9f97b
ID		 3385 */
3386 if (arg) {
3387 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3388 ret = -EFAULT;
3389 }
3390
3391out_bargs:
3392 kfree(bargs);
3393out:
3394 mutex_unlock(&fs_info->balance_mutex);
3395 mutex_unlock(&fs_info->volume_mutex);
e54bfa31 3396 mnt_drop_write_file(file);
c9e9f97b
ID		 3397 return ret;
3398}
3399
837d5b6e
ID		 3400static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
3401{
3402 if (!capable(CAP_SYS_ADMIN))
3403 return -EPERM;
3404
3405 switch (cmd) {
3406 case BTRFS_BALANCE_CTL_PAUSE:
3407 return btrfs_pause_balance(root->fs_info);
a7e99c69
ID		 3408 case BTRFS_BALANCE_CTL_CANCEL:
3409 return btrfs_cancel_balance(root->fs_info);
837d5b6e
ID		 3410 }
3411
3412 return -EINVAL;
3413}
3414
19a39dce
ID		 3415static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
3416 void __user *arg)
3417{
3418 struct btrfs_fs_info *fs_info = root->fs_info;
3419 struct btrfs_ioctl_balance_args *bargs;
3420 int ret = 0;
3421
3422 if (!capable(CAP_SYS_ADMIN))
3423 return -EPERM;
3424
3425 mutex_lock(&fs_info->balance_mutex);
3426 if (!fs_info->balance_ctl) {
3427 ret = -ENOTCONN;
3428 goto out;
3429 }
3430
3431 bargs = kzalloc(sizeof(*bargs), GFP_NOFS);
3432 if (!bargs) {
3433 ret = -ENOMEM;
3434 goto out;
3435 }
3436
3437 update_ioctl_balance_args(fs_info, 1, bargs);
3438
3439 if (copy_to_user(arg, bargs, sizeof(*bargs)))
3440 ret = -EFAULT;
3441
3442 kfree(bargs);
3443out:
3444 mutex_unlock(&fs_info->balance_mutex);
3445 return ret;
3446}
3447
5d13a37b
AJ		 3448static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg)
3449{
3450 struct btrfs_ioctl_quota_ctl_args *sa;
3451 struct btrfs_trans_handle *trans = NULL;
3452 int ret;
3453 int err;
3454
3455 if (!capable(CAP_SYS_ADMIN))
3456 return -EPERM;
3457
3458 if (root->fs_info->sb->s_flags & MS_RDONLY)
3459 return -EROFS;
3460
3461 sa = memdup_user(arg, sizeof(*sa));
3462 if (IS_ERR(sa))
3463 return PTR_ERR(sa);
3464
3465 if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) {
3466 trans = btrfs_start_transaction(root, 2);
3467 if (IS_ERR(trans)) {
3468 ret = PTR_ERR(trans);
3469 goto out;
3470 }
3471 }
3472
3473 switch (sa->cmd) {
3474 case BTRFS_QUOTA_CTL_ENABLE:
3475 ret = btrfs_quota_enable(trans, root->fs_info);
3476 break;
3477 case BTRFS_QUOTA_CTL_DISABLE:
3478 ret = btrfs_quota_disable(trans, root->fs_info);
3479 break;
3480 case BTRFS_QUOTA_CTL_RESCAN:
3481 ret = btrfs_quota_rescan(root->fs_info);
3482 break;
3483 default:
3484 ret = -EINVAL;
3485 break;
3486 }
3487
3488 if (copy_to_user(arg, sa, sizeof(*sa)))
3489 ret = -EFAULT;
3490
3491 if (trans) {
3492 err = btrfs_commit_transaction(trans, root);
3493 if (err && !ret)
3494 ret = err;
3495 }
3496
3497out:
3498 kfree(sa);
3499 return ret;
3500}
3501
3502static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg)
3503{
3504 struct btrfs_ioctl_qgroup_assign_args *sa;
3505 struct btrfs_trans_handle *trans;
3506 int ret;
3507 int err;
3508
3509 if (!capable(CAP_SYS_ADMIN))
3510 return -EPERM;
3511
3512 if (root->fs_info->sb->s_flags & MS_RDONLY)
3513 return -EROFS;
3514
3515 sa = memdup_user(arg, sizeof(*sa));
3516 if (IS_ERR(sa))
3517 return PTR_ERR(sa);
3518
3519 trans = btrfs_join_transaction(root);
3520 if (IS_ERR(trans)) {
3521 ret = PTR_ERR(trans);
3522 goto out;
3523 }
3524
3525 /* FIXME: check if the IDs really exist */
3526 if (sa->assign) {
3527 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
3528 sa->src, sa->dst);
3529 } else {
3530 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
3531 sa->src, sa->dst);
3532 }
3533
3534 err = btrfs_end_transaction(trans, root);
3535 if (err && !ret)
3536 ret = err;
3537
3538out:
3539 kfree(sa);
3540 return ret;
3541}
3542
3543static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg)
3544{
3545 struct btrfs_ioctl_qgroup_create_args *sa;
3546 struct btrfs_trans_handle *trans;
3547 int ret;
3548 int err;
3549
3550 if (!capable(CAP_SYS_ADMIN))
3551 return -EPERM;
3552
3553 if (root->fs_info->sb->s_flags & MS_RDONLY)
3554 return -EROFS;
3555
3556 sa = memdup_user(arg, sizeof(*sa));
3557 if (IS_ERR(sa))
3558 return PTR_ERR(sa);
3559
3560 trans = btrfs_join_transaction(root);
3561 if (IS_ERR(trans)) {
3562 ret = PTR_ERR(trans);
3563 goto out;
3564 }
3565
3566 /* FIXME: check if the IDs really exist */
3567 if (sa->create) {
3568 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid,
3569 NULL);
3570 } else {
3571 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
3572 }
3573
3574 err = btrfs_end_transaction(trans, root);
3575 if (err && !ret)
3576 ret = err;
3577
3578out:
3579 kfree(sa);
3580 return ret;
3581}
3582
3583static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg)
3584{
3585 struct btrfs_ioctl_qgroup_limit_args *sa;
3586 struct btrfs_trans_handle *trans;
3587 int ret;
3588 int err;
3589 u64 qgroupid;
3590
3591 if (!capable(CAP_SYS_ADMIN))
3592 return -EPERM;
3593
3594 if (root->fs_info->sb->s_flags & MS_RDONLY)
3595 return -EROFS;
3596
3597 sa = memdup_user(arg, sizeof(*sa));
3598 if (IS_ERR(sa))
3599 return PTR_ERR(sa);
3600
3601 trans = btrfs_join_transaction(root);
3602 if (IS_ERR(trans)) {
3603 ret = PTR_ERR(trans);
3604 goto out;
3605 }
3606
3607 qgroupid = sa->qgroupid;
3608 if (!qgroupid) {
3609 /* take the current subvol as qgroup */
3610 qgroupid = root->root_key.objectid;
3611 }
3612
3613 /* FIXME: check if the IDs really exist */
3614 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
3615
3616 err = btrfs_end_transaction(trans, root);
3617 if (err && !ret)
3618 ret = err;
3619
3620out:
3621 kfree(sa);
3622 return ret;
3623}
3624
8ea05e3a
AB		 3625static long btrfs_ioctl_set_received_subvol(struct file *file,
3626 void __user *arg)
3627{
3628 struct btrfs_ioctl_received_subvol_args *sa = NULL;
3629 struct inode *inode = fdentry(file)->d_inode;
3630 struct btrfs_root *root = BTRFS_I(inode)->root;
3631 struct btrfs_root_item *root_item = &root->root_item;
3632 struct btrfs_trans_handle *trans;
3633 struct timespec ct = CURRENT_TIME;
3634 int ret = 0;
3635
3636 ret = mnt_want_write_file(file);
3637 if (ret < 0)
3638 return ret;
3639
3640 down_write(&root->fs_info->subvol_sem);
3641
3642 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
3643 ret = -EINVAL;
3644 goto out;
3645 }
3646
3647 if (btrfs_root_readonly(root)) {
3648 ret = -EROFS;
3649 goto out;
3650 }
3651
3652 if (!inode_owner_or_capable(inode)) {
3653 ret = -EACCES;
3654 goto out;
3655 }
3656
3657 sa = memdup_user(arg, sizeof(*sa));
3658 if (IS_ERR(sa)) {
3659 ret = PTR_ERR(sa);
3660 sa = NULL;
3661 goto out;
3662 }
3663
3664 trans = btrfs_start_transaction(root, 1);
3665 if (IS_ERR(trans)) {
3666 ret = PTR_ERR(trans);
3667 trans = NULL;
3668 goto out;
3669 }
3670
3671 sa->rtransid = trans->transid;
3672 sa->rtime.sec = ct.tv_sec;
3673 sa->rtime.nsec = ct.tv_nsec;
3674
3675 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
3676 btrfs_set_root_stransid(root_item, sa->stransid);
3677 btrfs_set_root_rtransid(root_item, sa->rtransid);
3678 root_item->stime.sec = cpu_to_le64(sa->stime.sec);
3679 root_item->stime.nsec = cpu_to_le32(sa->stime.nsec);
3680 root_item->rtime.sec = cpu_to_le64(sa->rtime.sec);
3681 root_item->rtime.nsec = cpu_to_le32(sa->rtime.nsec);
3682
3683 ret = btrfs_update_root(trans, root->fs_info->tree_root,
3684 &root->root_key, &root->root_item);
3685 if (ret < 0) {
3686 btrfs_end_transaction(trans, root);
3687 trans = NULL;
3688 goto out;
3689 } else {
3690 ret = btrfs_commit_transaction(trans, root);
3691 if (ret < 0)
3692 goto out;
3693 }
3694
3695 ret = copy_to_user(arg, sa, sizeof(*sa));
3696 if (ret)
3697 ret = -EFAULT;
3698
3699out:
3700 kfree(sa);
3701 up_write(&root->fs_info->subvol_sem);
3702 mnt_drop_write_file(file);
3703 return ret;
3704}
3705
f46b5a66
CH		 3706long btrfs_ioctl(struct file *file, unsigned int
3707 cmd, unsigned long arg)
3708{
3709 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
4bcabaa3 3710 void __user *argp = (void __user *)arg;
f46b5a66
CH		 3711
3712 switch (cmd) {
6cbff00f
CH		 3713 case FS_IOC_GETFLAGS:
3714 return btrfs_ioctl_getflags(file, argp);
3715 case FS_IOC_SETFLAGS:
3716 return btrfs_ioctl_setflags(file, argp);
3717 case FS_IOC_GETVERSION:
3718 return btrfs_ioctl_getversion(file, argp);
f7039b1d
LD		 3719 case FITRIM:
3720 return btrfs_ioctl_fitrim(file, argp);
f46b5a66 3721 case BTRFS_IOC_SNAP_CREATE:
fa0d2b9b 3722 return btrfs_ioctl_snap_create(file, argp, 0);
fdfb1e4f 3723 case BTRFS_IOC_SNAP_CREATE_V2:
fa0d2b9b 3724 return btrfs_ioctl_snap_create_v2(file, argp, 0);
3de4586c 3725 case BTRFS_IOC_SUBVOL_CREATE:
fa0d2b9b 3726 return btrfs_ioctl_snap_create(file, argp, 1);
6f72c7e2
AJ		 3727 case BTRFS_IOC_SUBVOL_CREATE_V2:
3728 return btrfs_ioctl_snap_create_v2(file, argp, 1);
76dda93c
YZ		 3729 case BTRFS_IOC_SNAP_DESTROY:
3730 return btrfs_ioctl_snap_destroy(file, argp);
0caa102d
LZ		 3731 case BTRFS_IOC_SUBVOL_GETFLAGS:
3732 return btrfs_ioctl_subvol_getflags(file, argp);
3733 case BTRFS_IOC_SUBVOL_SETFLAGS:
3734 return btrfs_ioctl_subvol_setflags(file, argp);
6ef5ed0d
JB		 3735 case BTRFS_IOC_DEFAULT_SUBVOL:
3736 return btrfs_ioctl_default_subvol(file, argp);
f46b5a66 3737 case BTRFS_IOC_DEFRAG:
1e701a32
CM		 3738 return btrfs_ioctl_defrag(file, NULL);
3739 case BTRFS_IOC_DEFRAG_RANGE:
3740 return btrfs_ioctl_defrag(file, argp);
f46b5a66 3741 case BTRFS_IOC_RESIZE:
4bcabaa3 3742 return btrfs_ioctl_resize(root, argp);
f46b5a66 3743 case BTRFS_IOC_ADD_DEV:
4bcabaa3 3744 return btrfs_ioctl_add_dev(root, argp);
f46b5a66 3745 case BTRFS_IOC_RM_DEV:
4bcabaa3 3746 return btrfs_ioctl_rm_dev(root, argp);
475f6387
JS		 3747 case BTRFS_IOC_FS_INFO:
3748 return btrfs_ioctl_fs_info(root, argp);
3749 case BTRFS_IOC_DEV_INFO:
3750 return btrfs_ioctl_dev_info(root, argp);
f46b5a66 3751 case BTRFS_IOC_BALANCE:
9ba1f6e4 3752 return btrfs_ioctl_balance(file, NULL);
f46b5a66 3753 case BTRFS_IOC_CLONE:
c5c9cd4d
SW		 3754 return btrfs_ioctl_clone(file, arg, 0, 0, 0);
3755 case BTRFS_IOC_CLONE_RANGE:
7a865e8a 3756 return btrfs_ioctl_clone_range(file, argp);
f46b5a66
CH		 3757 case BTRFS_IOC_TRANS_START:
3758 return btrfs_ioctl_trans_start(file);
3759 case BTRFS_IOC_TRANS_END:
3760 return btrfs_ioctl_trans_end(file);
ac8e9819
CM		 3761 case BTRFS_IOC_TREE_SEARCH:
3762 return btrfs_ioctl_tree_search(file, argp);
3763 case BTRFS_IOC_INO_LOOKUP:
3764 return btrfs_ioctl_ino_lookup(file, argp);
d7728c96
JS		 3765 case BTRFS_IOC_INO_PATHS:
3766 return btrfs_ioctl_ino_to_path(root, argp);
3767 case BTRFS_IOC_LOGICAL_INO:
3768 return btrfs_ioctl_logical_to_ino(root, argp);
1406e432
JB		 3769 case BTRFS_IOC_SPACE_INFO:
3770 return btrfs_ioctl_space_info(root, argp);
f46b5a66
CH		 3771 case BTRFS_IOC_SYNC:
3772 btrfs_sync_fs(file->f_dentry->d_sb, 1);
3773 return 0;
46204592
SW		 3774 case BTRFS_IOC_START_SYNC:
3775 return btrfs_ioctl_start_sync(file, argp);
3776 case BTRFS_IOC_WAIT_SYNC:
3777 return btrfs_ioctl_wait_sync(file, argp);
475f6387
JS		 3778 case BTRFS_IOC_SCRUB:
3779 return btrfs_ioctl_scrub(root, argp);
3780 case BTRFS_IOC_SCRUB_CANCEL:
3781 return btrfs_ioctl_scrub_cancel(root, argp);
3782 case BTRFS_IOC_SCRUB_PROGRESS:
3783 return btrfs_ioctl_scrub_progress(root, argp);
c9e9f97b 3784 case BTRFS_IOC_BALANCE_V2:
9ba1f6e4 3785 return btrfs_ioctl_balance(file, argp);
837d5b6e
ID		 3786 case BTRFS_IOC_BALANCE_CTL:
3787 return btrfs_ioctl_balance_ctl(root, arg);
19a39dce
ID		 3788 case BTRFS_IOC_BALANCE_PROGRESS:
3789 return btrfs_ioctl_balance_progress(root, argp);
8ea05e3a
AB		 3790 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
3791 return btrfs_ioctl_set_received_subvol(file, argp);
31db9f7c
AB		 3792 case BTRFS_IOC_SEND:
3793 return btrfs_ioctl_send(file, argp);
c11d2c23 3794 case BTRFS_IOC_GET_DEV_STATS:
b27f7c0c 3795 return btrfs_ioctl_get_dev_stats(root, argp);
5d13a37b
AJ		 3796 case BTRFS_IOC_QUOTA_CTL:
3797 return btrfs_ioctl_quota_ctl(root, argp);
3798 case BTRFS_IOC_QGROUP_ASSIGN:
3799 return btrfs_ioctl_qgroup_assign(root, argp);
3800 case BTRFS_IOC_QGROUP_CREATE:
3801 return btrfs_ioctl_qgroup_create(root, argp);
3802 case BTRFS_IOC_QGROUP_LIMIT:
3803 return btrfs_ioctl_qgroup_limit(root, argp);
f46b5a66
CH		 3804 }
3805
3806 return -ENOTTY;
3807}
kernel source for telekom puls (alcatel/mediatek)