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Btrfs: fix file loss on log replay after renaming a file and fsync
[mirror_ubuntu-bionic-kernel.git] / fs / btrfs / ioctl.c
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>
24 #include <linux/fsnotify.h>
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>
30 #include <linux/backing-dev.h>
31 #include <linux/mount.h>
32 #include <linux/mpage.h>
33 #include <linux/namei.h>
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>
39 #include <linux/security.h>
40 #include <linux/xattr.h>
41 #include <linux/vmalloc.h>
42 #include <linux/slab.h>
43 #include <linux/blkdev.h>
44 #include <linux/uuid.h>
45 #include <linux/btrfs.h>
46 #include <linux/uaccess.h>
47 #include "ctree.h"
48 #include "disk-io.h"
49 #include "transaction.h"
50 #include "btrfs_inode.h"
51 #include "print-tree.h"
52 #include "volumes.h"
53 #include "locking.h"
54 #include "inode-map.h"
55 #include "backref.h"
56 #include "rcu-string.h"
57 #include "send.h"
58 #include "dev-replace.h"
59 #include "props.h"
60 #include "sysfs.h"
61 #include "qgroup.h"
62 #include "tree-log.h"
63
64 #ifdef CONFIG_64BIT
65 /* If we have a 32-bit userspace and 64-bit kernel, then the UAPI
66 * structures are incorrect, as the timespec structure from userspace
67 * is 4 bytes too small. We define these alternatives here to teach
68 * the kernel about the 32-bit struct packing.
69 */
70 struct btrfs_ioctl_timespec_32 {
71 __u64 sec;
72 __u32 nsec;
73 } __attribute__ ((__packed__));
74
75 struct btrfs_ioctl_received_subvol_args_32 {
76 char uuid[BTRFS_UUID_SIZE]; /* in */
77 __u64 stransid; /* in */
78 __u64 rtransid; /* out */
79 struct btrfs_ioctl_timespec_32 stime; /* in */
80 struct btrfs_ioctl_timespec_32 rtime; /* out */
81 __u64 flags; /* in */
82 __u64 reserved[16]; /* in */
83 } __attribute__ ((__packed__));
84
85 #define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
86 struct btrfs_ioctl_received_subvol_args_32)
87 #endif
88
89
90 static int btrfs_clone(struct inode *src, struct inode *inode,
91 u64 off, u64 olen, u64 olen_aligned, u64 destoff,
92 int no_time_update);
93
94 /* Mask out flags that are inappropriate for the given type of inode. */
95 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
96 {
97 if (S_ISDIR(mode))
98 return flags;
99 else if (S_ISREG(mode))
100 return flags & ~FS_DIRSYNC_FL;
101 else
102 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
103 }
104
105 /*
106 * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl.
107 */
108 static unsigned int btrfs_flags_to_ioctl(unsigned int flags)
109 {
110 unsigned int iflags = 0;
111
112 if (flags & BTRFS_INODE_SYNC)
113 iflags |= FS_SYNC_FL;
114 if (flags & BTRFS_INODE_IMMUTABLE)
115 iflags |= FS_IMMUTABLE_FL;
116 if (flags & BTRFS_INODE_APPEND)
117 iflags |= FS_APPEND_FL;
118 if (flags & BTRFS_INODE_NODUMP)
119 iflags |= FS_NODUMP_FL;
120 if (flags & BTRFS_INODE_NOATIME)
121 iflags |= FS_NOATIME_FL;
122 if (flags & BTRFS_INODE_DIRSYNC)
123 iflags |= FS_DIRSYNC_FL;
124 if (flags & BTRFS_INODE_NODATACOW)
125 iflags |= FS_NOCOW_FL;
126
127 if ((flags & BTRFS_INODE_COMPRESS) && !(flags & BTRFS_INODE_NOCOMPRESS))
128 iflags |= FS_COMPR_FL;
129 else if (flags & BTRFS_INODE_NOCOMPRESS)
130 iflags |= FS_NOCOMP_FL;
131
132 return iflags;
133 }
134
135 /*
136 * Update inode->i_flags based on the btrfs internal flags.
137 */
138 void btrfs_update_iflags(struct inode *inode)
139 {
140 struct btrfs_inode *ip = BTRFS_I(inode);
141 unsigned int new_fl = 0;
142
143 if (ip->flags & BTRFS_INODE_SYNC)
144 new_fl |= S_SYNC;
145 if (ip->flags & BTRFS_INODE_IMMUTABLE)
146 new_fl |= S_IMMUTABLE;
147 if (ip->flags & BTRFS_INODE_APPEND)
148 new_fl |= S_APPEND;
149 if (ip->flags & BTRFS_INODE_NOATIME)
150 new_fl |= S_NOATIME;
151 if (ip->flags & BTRFS_INODE_DIRSYNC)
152 new_fl |= S_DIRSYNC;
153
154 set_mask_bits(&inode->i_flags,
155 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
156 new_fl);
157 }
158
159 /*
160 * Inherit flags from the parent inode.
161 *
162 * Currently only the compression flags and the cow flags are inherited.
163 */
164 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir)
165 {
166 unsigned int flags;
167
168 if (!dir)
169 return;
170
171 flags = BTRFS_I(dir)->flags;
172
173 if (flags & BTRFS_INODE_NOCOMPRESS) {
174 BTRFS_I(inode)->flags &= ~BTRFS_INODE_COMPRESS;
175 BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;
176 } else if (flags & BTRFS_INODE_COMPRESS) {
177 BTRFS_I(inode)->flags &= ~BTRFS_INODE_NOCOMPRESS;
178 BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS;
179 }
180
181 if (flags & BTRFS_INODE_NODATACOW) {
182 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
183 if (S_ISREG(inode->i_mode))
184 BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
185 }
186
187 btrfs_update_iflags(inode);
188 }
189
190 static int btrfs_ioctl_getflags(struct file *file, void __user *arg)
191 {
192 struct btrfs_inode *ip = BTRFS_I(file_inode(file));
193 unsigned int flags = btrfs_flags_to_ioctl(ip->flags);
194
195 if (copy_to_user(arg, &flags, sizeof(flags)))
196 return -EFAULT;
197 return 0;
198 }
199
200 static int check_flags(unsigned int flags)
201 {
202 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
203 FS_NOATIME_FL | FS_NODUMP_FL | \
204 FS_SYNC_FL | FS_DIRSYNC_FL | \
205 FS_NOCOMP_FL | FS_COMPR_FL |
206 FS_NOCOW_FL))
207 return -EOPNOTSUPP;
208
209 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
210 return -EINVAL;
211
212 return 0;
213 }
214
215 static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
216 {
217 struct inode *inode = file_inode(file);
218 struct btrfs_inode *ip = BTRFS_I(inode);
219 struct btrfs_root *root = ip->root;
220 struct btrfs_trans_handle *trans;
221 unsigned int flags, oldflags;
222 int ret;
223 u64 ip_oldflags;
224 unsigned int i_oldflags;
225 umode_t mode;
226
227 if (!inode_owner_or_capable(inode))
228 return -EPERM;
229
230 if (btrfs_root_readonly(root))
231 return -EROFS;
232
233 if (copy_from_user(&flags, arg, sizeof(flags)))
234 return -EFAULT;
235
236 ret = check_flags(flags);
237 if (ret)
238 return ret;
239
240 ret = mnt_want_write_file(file);
241 if (ret)
242 return ret;
243
244 inode_lock(inode);
245
246 ip_oldflags = ip->flags;
247 i_oldflags = inode->i_flags;
248 mode = inode->i_mode;
249
250 flags = btrfs_mask_flags(inode->i_mode, flags);
251 oldflags = btrfs_flags_to_ioctl(ip->flags);
252 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
253 if (!capable(CAP_LINUX_IMMUTABLE)) {
254 ret = -EPERM;
255 goto out_unlock;
256 }
257 }
258
259 if (flags & FS_SYNC_FL)
260 ip->flags |= BTRFS_INODE_SYNC;
261 else
262 ip->flags &= ~BTRFS_INODE_SYNC;
263 if (flags & FS_IMMUTABLE_FL)
264 ip->flags |= BTRFS_INODE_IMMUTABLE;
265 else
266 ip->flags &= ~BTRFS_INODE_IMMUTABLE;
267 if (flags & FS_APPEND_FL)
268 ip->flags |= BTRFS_INODE_APPEND;
269 else
270 ip->flags &= ~BTRFS_INODE_APPEND;
271 if (flags & FS_NODUMP_FL)
272 ip->flags |= BTRFS_INODE_NODUMP;
273 else
274 ip->flags &= ~BTRFS_INODE_NODUMP;
275 if (flags & FS_NOATIME_FL)
276 ip->flags |= BTRFS_INODE_NOATIME;
277 else
278 ip->flags &= ~BTRFS_INODE_NOATIME;
279 if (flags & FS_DIRSYNC_FL)
280 ip->flags |= BTRFS_INODE_DIRSYNC;
281 else
282 ip->flags &= ~BTRFS_INODE_DIRSYNC;
283 if (flags & FS_NOCOW_FL) {
284 if (S_ISREG(mode)) {
285 /*
286 * It's safe to turn csums off here, no extents exist.
287 * Otherwise we want the flag to reflect the real COW
288 * status of the file and will not set it.
289 */
290 if (inode->i_size == 0)
291 ip->flags |= BTRFS_INODE_NODATACOW
292 | BTRFS_INODE_NODATASUM;
293 } else {
294 ip->flags |= BTRFS_INODE_NODATACOW;
295 }
296 } else {
297 /*
298 * Revert back under same assuptions as above
299 */
300 if (S_ISREG(mode)) {
301 if (inode->i_size == 0)
302 ip->flags &= ~(BTRFS_INODE_NODATACOW
303 | BTRFS_INODE_NODATASUM);
304 } else {
305 ip->flags &= ~BTRFS_INODE_NODATACOW;
306 }
307 }
308
309 /*
310 * The COMPRESS flag can only be changed by users, while the NOCOMPRESS
311 * flag may be changed automatically if compression code won't make
312 * things smaller.
313 */
314 if (flags & FS_NOCOMP_FL) {
315 ip->flags &= ~BTRFS_INODE_COMPRESS;
316 ip->flags |= BTRFS_INODE_NOCOMPRESS;
317
318 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
319 if (ret && ret != -ENODATA)
320 goto out_drop;
321 } else if (flags & FS_COMPR_FL) {
322 const char *comp;
323
324 ip->flags |= BTRFS_INODE_COMPRESS;
325 ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
326
327 if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
328 comp = "lzo";
329 else
330 comp = "zlib";
331 ret = btrfs_set_prop(inode, "btrfs.compression",
332 comp, strlen(comp), 0);
333 if (ret)
334 goto out_drop;
335
336 } else {
337 ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
338 if (ret && ret != -ENODATA)
339 goto out_drop;
340 ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
341 }
342
343 trans = btrfs_start_transaction(root, 1);
344 if (IS_ERR(trans)) {
345 ret = PTR_ERR(trans);
346 goto out_drop;
347 }
348
349 btrfs_update_iflags(inode);
350 inode_inc_iversion(inode);
351 inode->i_ctime = current_fs_time(inode->i_sb);
352 ret = btrfs_update_inode(trans, root, inode);
353
354 btrfs_end_transaction(trans, root);
355 out_drop:
356 if (ret) {
357 ip->flags = ip_oldflags;
358 inode->i_flags = i_oldflags;
359 }
360
361 out_unlock:
362 inode_unlock(inode);
363 mnt_drop_write_file(file);
364 return ret;
365 }
366
367 static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
368 {
369 struct inode *inode = file_inode(file);
370
371 return put_user(inode->i_generation, arg);
372 }
373
374 static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
375 {
376 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
377 struct btrfs_device *device;
378 struct request_queue *q;
379 struct fstrim_range range;
380 u64 minlen = ULLONG_MAX;
381 u64 num_devices = 0;
382 u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
383 int ret;
384
385 if (!capable(CAP_SYS_ADMIN))
386 return -EPERM;
387
388 rcu_read_lock();
389 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
390 dev_list) {
391 if (!device->bdev)
392 continue;
393 q = bdev_get_queue(device->bdev);
394 if (blk_queue_discard(q)) {
395 num_devices++;
396 minlen = min((u64)q->limits.discard_granularity,
397 minlen);
398 }
399 }
400 rcu_read_unlock();
401
402 if (!num_devices)
403 return -EOPNOTSUPP;
404 if (copy_from_user(&range, arg, sizeof(range)))
405 return -EFAULT;
406 if (range.start > total_bytes ||
407 range.len < fs_info->sb->s_blocksize)
408 return -EINVAL;
409
410 range.len = min(range.len, total_bytes - range.start);
411 range.minlen = max(range.minlen, minlen);
412 ret = btrfs_trim_fs(fs_info->tree_root, &range);
413 if (ret < 0)
414 return ret;
415
416 if (copy_to_user(arg, &range, sizeof(range)))
417 return -EFAULT;
418
419 return 0;
420 }
421
422 int btrfs_is_empty_uuid(u8 *uuid)
423 {
424 int i;
425
426 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
427 if (uuid[i])
428 return 0;
429 }
430 return 1;
431 }
432
433 static noinline int create_subvol(struct inode *dir,
434 struct dentry *dentry,
435 char *name, int namelen,
436 u64 *async_transid,
437 struct btrfs_qgroup_inherit *inherit)
438 {
439 struct btrfs_trans_handle *trans;
440 struct btrfs_key key;
441 struct btrfs_root_item root_item;
442 struct btrfs_inode_item *inode_item;
443 struct extent_buffer *leaf;
444 struct btrfs_root *root = BTRFS_I(dir)->root;
445 struct btrfs_root *new_root;
446 struct btrfs_block_rsv block_rsv;
447 struct timespec cur_time = current_fs_time(dir->i_sb);
448 struct inode *inode;
449 int ret;
450 int err;
451 u64 objectid;
452 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
453 u64 index = 0;
454 u64 qgroup_reserved;
455 uuid_le new_uuid;
456
457 ret = btrfs_find_free_objectid(root->fs_info->tree_root, &objectid);
458 if (ret)
459 return ret;
460
461 /*
462 * Don't create subvolume whose level is not zero. Or qgroup will be
463 * screwed up since it assume subvolme qgroup's level to be 0.
464 */
465 if (btrfs_qgroup_level(objectid))
466 return -ENOSPC;
467
468 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
469 /*
470 * The same as the snapshot creation, please see the comment
471 * of create_snapshot().
472 */
473 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv,
474 8, &qgroup_reserved, false);
475 if (ret)
476 return ret;
477
478 trans = btrfs_start_transaction(root, 0);
479 if (IS_ERR(trans)) {
480 ret = PTR_ERR(trans);
481 btrfs_subvolume_release_metadata(root, &block_rsv,
482 qgroup_reserved);
483 return ret;
484 }
485 trans->block_rsv = &block_rsv;
486 trans->bytes_reserved = block_rsv.size;
487
488 ret = btrfs_qgroup_inherit(trans, root->fs_info, 0, objectid, inherit);
489 if (ret)
490 goto fail;
491
492 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
493 if (IS_ERR(leaf)) {
494 ret = PTR_ERR(leaf);
495 goto fail;
496 }
497
498 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
499 btrfs_set_header_bytenr(leaf, leaf->start);
500 btrfs_set_header_generation(leaf, trans->transid);
501 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
502 btrfs_set_header_owner(leaf, objectid);
503
504 write_extent_buffer(leaf, root->fs_info->fsid, btrfs_header_fsid(),
505 BTRFS_FSID_SIZE);
506 write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid,
507 btrfs_header_chunk_tree_uuid(leaf),
508 BTRFS_UUID_SIZE);
509 btrfs_mark_buffer_dirty(leaf);
510
511 memset(&root_item, 0, sizeof(root_item));
512
513 inode_item = &root_item.inode;
514 btrfs_set_stack_inode_generation(inode_item, 1);
515 btrfs_set_stack_inode_size(inode_item, 3);
516 btrfs_set_stack_inode_nlink(inode_item, 1);
517 btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
518 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
519
520 btrfs_set_root_flags(&root_item, 0);
521 btrfs_set_root_limit(&root_item, 0);
522 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
523
524 btrfs_set_root_bytenr(&root_item, leaf->start);
525 btrfs_set_root_generation(&root_item, trans->transid);
526 btrfs_set_root_level(&root_item, 0);
527 btrfs_set_root_refs(&root_item, 1);
528 btrfs_set_root_used(&root_item, leaf->len);
529 btrfs_set_root_last_snapshot(&root_item, 0);
530
531 btrfs_set_root_generation_v2(&root_item,
532 btrfs_root_generation(&root_item));
533 uuid_le_gen(&new_uuid);
534 memcpy(root_item.uuid, new_uuid.b, BTRFS_UUID_SIZE);
535 btrfs_set_stack_timespec_sec(&root_item.otime, cur_time.tv_sec);
536 btrfs_set_stack_timespec_nsec(&root_item.otime, cur_time.tv_nsec);
537 root_item.ctime = root_item.otime;
538 btrfs_set_root_ctransid(&root_item, trans->transid);
539 btrfs_set_root_otransid(&root_item, trans->transid);
540
541 btrfs_tree_unlock(leaf);
542 free_extent_buffer(leaf);
543 leaf = NULL;
544
545 btrfs_set_root_dirid(&root_item, new_dirid);
546
547 key.objectid = objectid;
548 key.offset = 0;
549 key.type = BTRFS_ROOT_ITEM_KEY;
550 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
551 &root_item);
552 if (ret)
553 goto fail;
554
555 key.offset = (u64)-1;
556 new_root = btrfs_read_fs_root_no_name(root->fs_info, &key);
557 if (IS_ERR(new_root)) {
558 ret = PTR_ERR(new_root);
559 btrfs_abort_transaction(trans, root, ret);
560 goto fail;
561 }
562
563 btrfs_record_root_in_trans(trans, new_root);
564
565 ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
566 if (ret) {
567 /* We potentially lose an unused inode item here */
568 btrfs_abort_transaction(trans, root, ret);
569 goto fail;
570 }
571
572 mutex_lock(&new_root->objectid_mutex);
573 new_root->highest_objectid = new_dirid;
574 mutex_unlock(&new_root->objectid_mutex);
575
576 /*
577 * insert the directory item
578 */
579 ret = btrfs_set_inode_index(dir, &index);
580 if (ret) {
581 btrfs_abort_transaction(trans, root, ret);
582 goto fail;
583 }
584
585 ret = btrfs_insert_dir_item(trans, root,
586 name, namelen, dir, &key,
587 BTRFS_FT_DIR, index);
588 if (ret) {
589 btrfs_abort_transaction(trans, root, ret);
590 goto fail;
591 }
592
593 btrfs_i_size_write(dir, dir->i_size + namelen * 2);
594 ret = btrfs_update_inode(trans, root, dir);
595 BUG_ON(ret);
596
597 ret = btrfs_add_root_ref(trans, root->fs_info->tree_root,
598 objectid, root->root_key.objectid,
599 btrfs_ino(dir), index, name, namelen);
600 BUG_ON(ret);
601
602 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
603 root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
604 objectid);
605 if (ret)
606 btrfs_abort_transaction(trans, root, ret);
607
608 fail:
609 trans->block_rsv = NULL;
610 trans->bytes_reserved = 0;
611 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
612
613 if (async_transid) {
614 *async_transid = trans->transid;
615 err = btrfs_commit_transaction_async(trans, root, 1);
616 if (err)
617 err = btrfs_commit_transaction(trans, root);
618 } else {
619 err = btrfs_commit_transaction(trans, root);
620 }
621 if (err && !ret)
622 ret = err;
623
624 if (!ret) {
625 inode = btrfs_lookup_dentry(dir, dentry);
626 if (IS_ERR(inode))
627 return PTR_ERR(inode);
628 d_instantiate(dentry, inode);
629 }
630 return ret;
631 }
632
633 static void btrfs_wait_for_no_snapshoting_writes(struct btrfs_root *root)
634 {
635 s64 writers;
636 DEFINE_WAIT(wait);
637
638 do {
639 prepare_to_wait(&root->subv_writers->wait, &wait,
640 TASK_UNINTERRUPTIBLE);
641
642 writers = percpu_counter_sum(&root->subv_writers->counter);
643 if (writers)
644 schedule();
645
646 finish_wait(&root->subv_writers->wait, &wait);
647 } while (writers);
648 }
649
650 static int create_snapshot(struct btrfs_root *root, struct inode *dir,
651 struct dentry *dentry, char *name, int namelen,
652 u64 *async_transid, bool readonly,
653 struct btrfs_qgroup_inherit *inherit)
654 {
655 struct inode *inode;
656 struct btrfs_pending_snapshot *pending_snapshot;
657 struct btrfs_trans_handle *trans;
658 int ret;
659
660 if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state))
661 return -EINVAL;
662
663 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
664 if (!pending_snapshot)
665 return -ENOMEM;
666
667 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
668 GFP_NOFS);
669 pending_snapshot->path = btrfs_alloc_path();
670 if (!pending_snapshot->root_item || !pending_snapshot->path) {
671 ret = -ENOMEM;
672 goto free_pending;
673 }
674
675 atomic_inc(&root->will_be_snapshoted);
676 smp_mb__after_atomic();
677 btrfs_wait_for_no_snapshoting_writes(root);
678
679 ret = btrfs_start_delalloc_inodes(root, 0);
680 if (ret)
681 goto dec_and_free;
682
683 btrfs_wait_ordered_extents(root, -1);
684
685 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
686 BTRFS_BLOCK_RSV_TEMP);
687 /*
688 * 1 - parent dir inode
689 * 2 - dir entries
690 * 1 - root item
691 * 2 - root ref/backref
692 * 1 - root of snapshot
693 * 1 - UUID item
694 */
695 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
696 &pending_snapshot->block_rsv, 8,
697 &pending_snapshot->qgroup_reserved,
698 false);
699 if (ret)
700 goto dec_and_free;
701
702 pending_snapshot->dentry = dentry;
703 pending_snapshot->root = root;
704 pending_snapshot->readonly = readonly;
705 pending_snapshot->dir = dir;
706 pending_snapshot->inherit = inherit;
707
708 trans = btrfs_start_transaction(root, 0);
709 if (IS_ERR(trans)) {
710 ret = PTR_ERR(trans);
711 goto fail;
712 }
713
714 spin_lock(&root->fs_info->trans_lock);
715 list_add(&pending_snapshot->list,
716 &trans->transaction->pending_snapshots);
717 spin_unlock(&root->fs_info->trans_lock);
718 if (async_transid) {
719 *async_transid = trans->transid;
720 ret = btrfs_commit_transaction_async(trans,
721 root->fs_info->extent_root, 1);
722 if (ret)
723 ret = btrfs_commit_transaction(trans, root);
724 } else {
725 ret = btrfs_commit_transaction(trans,
726 root->fs_info->extent_root);
727 }
728 if (ret)
729 goto fail;
730
731 ret = pending_snapshot->error;
732 if (ret)
733 goto fail;
734
735 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
736 if (ret)
737 goto fail;
738
739 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
740 if (IS_ERR(inode)) {
741 ret = PTR_ERR(inode);
742 goto fail;
743 }
744
745 d_instantiate(dentry, inode);
746 ret = 0;
747 fail:
748 btrfs_subvolume_release_metadata(BTRFS_I(dir)->root,
749 &pending_snapshot->block_rsv,
750 pending_snapshot->qgroup_reserved);
751 dec_and_free:
752 if (atomic_dec_and_test(&root->will_be_snapshoted))
753 wake_up_atomic_t(&root->will_be_snapshoted);
754 free_pending:
755 kfree(pending_snapshot->root_item);
756 btrfs_free_path(pending_snapshot->path);
757 kfree(pending_snapshot);
758
759 return ret;
760 }
761
762 /* copy of may_delete in fs/namei.c()
763 * Check whether we can remove a link victim from directory dir, check
764 * whether the type of victim is right.
765 * 1. We can't do it if dir is read-only (done in permission())
766 * 2. We should have write and exec permissions on dir
767 * 3. We can't remove anything from append-only dir
768 * 4. We can't do anything with immutable dir (done in permission())
769 * 5. If the sticky bit on dir is set we should either
770 * a. be owner of dir, or
771 * b. be owner of victim, or
772 * c. have CAP_FOWNER capability
773 * 6. If the victim is append-only or immutable we can't do antyhing with
774 * links pointing to it.
775 * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
776 * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
777 * 9. We can't remove a root or mountpoint.
778 * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
779 * nfs_async_unlink().
780 */
781
782 static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
783 {
784 int error;
785
786 if (d_really_is_negative(victim))
787 return -ENOENT;
788
789 BUG_ON(d_inode(victim->d_parent) != dir);
790 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
791
792 error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
793 if (error)
794 return error;
795 if (IS_APPEND(dir))
796 return -EPERM;
797 if (check_sticky(dir, d_inode(victim)) || IS_APPEND(d_inode(victim)) ||
798 IS_IMMUTABLE(d_inode(victim)) || IS_SWAPFILE(d_inode(victim)))
799 return -EPERM;
800 if (isdir) {
801 if (!d_is_dir(victim))
802 return -ENOTDIR;
803 if (IS_ROOT(victim))
804 return -EBUSY;
805 } else if (d_is_dir(victim))
806 return -EISDIR;
807 if (IS_DEADDIR(dir))
808 return -ENOENT;
809 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
810 return -EBUSY;
811 return 0;
812 }
813
814 /* copy of may_create in fs/namei.c() */
815 static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
816 {
817 if (d_really_is_positive(child))
818 return -EEXIST;
819 if (IS_DEADDIR(dir))
820 return -ENOENT;
821 return inode_permission(dir, MAY_WRITE | MAY_EXEC);
822 }
823
824 /*
825 * Create a new subvolume below @parent. This is largely modeled after
826 * sys_mkdirat and vfs_mkdir, but we only do a single component lookup
827 * inside this filesystem so it's quite a bit simpler.
828 */
829 static noinline int btrfs_mksubvol(struct path *parent,
830 char *name, int namelen,
831 struct btrfs_root *snap_src,
832 u64 *async_transid, bool readonly,
833 struct btrfs_qgroup_inherit *inherit)
834 {
835 struct inode *dir = d_inode(parent->dentry);
836 struct dentry *dentry;
837 int error;
838
839 error = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
840 if (error == -EINTR)
841 return error;
842
843 dentry = lookup_one_len(name, parent->dentry, namelen);
844 error = PTR_ERR(dentry);
845 if (IS_ERR(dentry))
846 goto out_unlock;
847
848 error = btrfs_may_create(dir, dentry);
849 if (error)
850 goto out_dput;
851
852 /*
853 * even if this name doesn't exist, we may get hash collisions.
854 * check for them now when we can safely fail
855 */
856 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
857 dir->i_ino, name,
858 namelen);
859 if (error)
860 goto out_dput;
861
862 down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
863
864 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
865 goto out_up_read;
866
867 if (snap_src) {
868 error = create_snapshot(snap_src, dir, dentry, name, namelen,
869 async_transid, readonly, inherit);
870 } else {
871 error = create_subvol(dir, dentry, name, namelen,
872 async_transid, inherit);
873 }
874 if (!error)
875 fsnotify_mkdir(dir, dentry);
876 out_up_read:
877 up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem);
878 out_dput:
879 dput(dentry);
880 out_unlock:
881 inode_unlock(dir);
882 return error;
883 }
884
885 /*
886 * When we're defragging a range, we don't want to kick it off again
887 * if it is really just waiting for delalloc to send it down.
888 * If we find a nice big extent or delalloc range for the bytes in the
889 * file you want to defrag, we return 0 to let you know to skip this
890 * part of the file
891 */
892 static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
893 {
894 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
895 struct extent_map *em = NULL;
896 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
897 u64 end;
898
899 read_lock(&em_tree->lock);
900 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
901 read_unlock(&em_tree->lock);
902
903 if (em) {
904 end = extent_map_end(em);
905 free_extent_map(em);
906 if (end - offset > thresh)
907 return 0;
908 }
909 /* if we already have a nice delalloc here, just stop */
910 thresh /= 2;
911 end = count_range_bits(io_tree, &offset, offset + thresh,
912 thresh, EXTENT_DELALLOC, 1);
913 if (end >= thresh)
914 return 0;
915 return 1;
916 }
917
918 /*
919 * helper function to walk through a file and find extents
920 * newer than a specific transid, and smaller than thresh.
921 *
922 * This is used by the defragging code to find new and small
923 * extents
924 */
925 static int find_new_extents(struct btrfs_root *root,
926 struct inode *inode, u64 newer_than,
927 u64 *off, u32 thresh)
928 {
929 struct btrfs_path *path;
930 struct btrfs_key min_key;
931 struct extent_buffer *leaf;
932 struct btrfs_file_extent_item *extent;
933 int type;
934 int ret;
935 u64 ino = btrfs_ino(inode);
936
937 path = btrfs_alloc_path();
938 if (!path)
939 return -ENOMEM;
940
941 min_key.objectid = ino;
942 min_key.type = BTRFS_EXTENT_DATA_KEY;
943 min_key.offset = *off;
944
945 while (1) {
946 ret = btrfs_search_forward(root, &min_key, path, newer_than);
947 if (ret != 0)
948 goto none;
949 process_slot:
950 if (min_key.objectid != ino)
951 goto none;
952 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
953 goto none;
954
955 leaf = path->nodes[0];
956 extent = btrfs_item_ptr(leaf, path->slots[0],
957 struct btrfs_file_extent_item);
958
959 type = btrfs_file_extent_type(leaf, extent);
960 if (type == BTRFS_FILE_EXTENT_REG &&
961 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
962 check_defrag_in_cache(inode, min_key.offset, thresh)) {
963 *off = min_key.offset;
964 btrfs_free_path(path);
965 return 0;
966 }
967
968 path->slots[0]++;
969 if (path->slots[0] < btrfs_header_nritems(leaf)) {
970 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
971 goto process_slot;
972 }
973
974 if (min_key.offset == (u64)-1)
975 goto none;
976
977 min_key.offset++;
978 btrfs_release_path(path);
979 }
980 none:
981 btrfs_free_path(path);
982 return -ENOENT;
983 }
984
985 static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
986 {
987 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
988 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
989 struct extent_map *em;
990 u64 len = PAGE_CACHE_SIZE;
991
992 /*
993 * hopefully we have this extent in the tree already, try without
994 * the full extent lock
995 */
996 read_lock(&em_tree->lock);
997 em = lookup_extent_mapping(em_tree, start, len);
998 read_unlock(&em_tree->lock);
999
1000 if (!em) {
1001 struct extent_state *cached = NULL;
1002 u64 end = start + len - 1;
1003
1004 /* get the big lock and read metadata off disk */
1005 lock_extent_bits(io_tree, start, end, &cached);
1006 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
1007 unlock_extent_cached(io_tree, start, end, &cached, GFP_NOFS);
1008
1009 if (IS_ERR(em))
1010 return NULL;
1011 }
1012
1013 return em;
1014 }
1015
1016 static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1017 {
1018 struct extent_map *next;
1019 bool ret = true;
1020
1021 /* this is the last extent */
1022 if (em->start + em->len >= i_size_read(inode))
1023 return false;
1024
1025 next = defrag_lookup_extent(inode, em->start + em->len);
1026 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1027 ret = false;
1028 else if ((em->block_start + em->block_len == next->block_start) &&
1029 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1030 ret = false;
1031
1032 free_extent_map(next);
1033 return ret;
1034 }
1035
1036 static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1037 u64 *last_len, u64 *skip, u64 *defrag_end,
1038 int compress)
1039 {
1040 struct extent_map *em;
1041 int ret = 1;
1042 bool next_mergeable = true;
1043 bool prev_mergeable = true;
1044
1045 /*
1046 * make sure that once we start defragging an extent, we keep on
1047 * defragging it
1048 */
1049 if (start < *defrag_end)
1050 return 1;
1051
1052 *skip = 0;
1053
1054 em = defrag_lookup_extent(inode, start);
1055 if (!em)
1056 return 0;
1057
1058 /* this will cover holes, and inline extents */
1059 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1060 ret = 0;
1061 goto out;
1062 }
1063
1064 if (!*defrag_end)
1065 prev_mergeable = false;
1066
1067 next_mergeable = defrag_check_next_extent(inode, em);
1068 /*
1069 * we hit a real extent, if it is big or the next extent is not a
1070 * real extent, don't bother defragging it
1071 */
1072 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1073 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1074 ret = 0;
1075 out:
1076 /*
1077 * last_len ends up being a counter of how many bytes we've defragged.
1078 * every time we choose not to defrag an extent, we reset *last_len
1079 * so that the next tiny extent will force a defrag.
1080 *
1081 * The end result of this is that tiny extents before a single big
1082 * extent will force at least part of that big extent to be defragged.
1083 */
1084 if (ret) {
1085 *defrag_end = extent_map_end(em);
1086 } else {
1087 *last_len = 0;
1088 *skip = extent_map_end(em);
1089 *defrag_end = 0;
1090 }
1091
1092 free_extent_map(em);
1093 return ret;
1094 }
1095
1096 /*
1097 * it doesn't do much good to defrag one or two pages
1098 * at a time. This pulls in a nice chunk of pages
1099 * to COW and defrag.
1100 *
1101 * It also makes sure the delalloc code has enough
1102 * dirty data to avoid making new small extents as part
1103 * of the defrag
1104 *
1105 * It's a good idea to start RA on this range
1106 * before calling this.
1107 */
1108 static int cluster_pages_for_defrag(struct inode *inode,
1109 struct page **pages,
1110 unsigned long start_index,
1111 unsigned long num_pages)
1112 {
1113 unsigned long file_end;
1114 u64 isize = i_size_read(inode);
1115 u64 page_start;
1116 u64 page_end;
1117 u64 page_cnt;
1118 int ret;
1119 int i;
1120 int i_done;
1121 struct btrfs_ordered_extent *ordered;
1122 struct extent_state *cached_state = NULL;
1123 struct extent_io_tree *tree;
1124 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1125
1126 file_end = (isize - 1) >> PAGE_CACHE_SHIFT;
1127 if (!isize || start_index > file_end)
1128 return 0;
1129
1130 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1131
1132 ret = btrfs_delalloc_reserve_space(inode,
1133 start_index << PAGE_CACHE_SHIFT,
1134 page_cnt << PAGE_CACHE_SHIFT);
1135 if (ret)
1136 return ret;
1137 i_done = 0;
1138 tree = &BTRFS_I(inode)->io_tree;
1139
1140 /* step one, lock all the pages */
1141 for (i = 0; i < page_cnt; i++) {
1142 struct page *page;
1143 again:
1144 page = find_or_create_page(inode->i_mapping,
1145 start_index + i, mask);
1146 if (!page)
1147 break;
1148
1149 page_start = page_offset(page);
1150 page_end = page_start + PAGE_CACHE_SIZE - 1;
1151 while (1) {
1152 lock_extent_bits(tree, page_start, page_end,
1153 &cached_state);
1154 ordered = btrfs_lookup_ordered_extent(inode,
1155 page_start);
1156 unlock_extent_cached(tree, page_start, page_end,
1157 &cached_state, GFP_NOFS);
1158 if (!ordered)
1159 break;
1160
1161 unlock_page(page);
1162 btrfs_start_ordered_extent(inode, ordered, 1);
1163 btrfs_put_ordered_extent(ordered);
1164 lock_page(page);
1165 /*
1166 * we unlocked the page above, so we need check if
1167 * it was released or not.
1168 */
1169 if (page->mapping != inode->i_mapping) {
1170 unlock_page(page);
1171 page_cache_release(page);
1172 goto again;
1173 }
1174 }
1175
1176 if (!PageUptodate(page)) {
1177 btrfs_readpage(NULL, page);
1178 lock_page(page);
1179 if (!PageUptodate(page)) {
1180 unlock_page(page);
1181 page_cache_release(page);
1182 ret = -EIO;
1183 break;
1184 }
1185 }
1186
1187 if (page->mapping != inode->i_mapping) {
1188 unlock_page(page);
1189 page_cache_release(page);
1190 goto again;
1191 }
1192
1193 pages[i] = page;
1194 i_done++;
1195 }
1196 if (!i_done || ret)
1197 goto out;
1198
1199 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1200 goto out;
1201
1202 /*
1203 * so now we have a nice long stream of locked
1204 * and up to date pages, lets wait on them
1205 */
1206 for (i = 0; i < i_done; i++)
1207 wait_on_page_writeback(pages[i]);
1208
1209 page_start = page_offset(pages[0]);
1210 page_end = page_offset(pages[i_done - 1]) + PAGE_CACHE_SIZE;
1211
1212 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1213 page_start, page_end - 1, &cached_state);
1214 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1215 page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
1216 EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 0, 0,
1217 &cached_state, GFP_NOFS);
1218
1219 if (i_done != page_cnt) {
1220 spin_lock(&BTRFS_I(inode)->lock);
1221 BTRFS_I(inode)->outstanding_extents++;
1222 spin_unlock(&BTRFS_I(inode)->lock);
1223 btrfs_delalloc_release_space(inode,
1224 start_index << PAGE_CACHE_SHIFT,
1225 (page_cnt - i_done) << PAGE_CACHE_SHIFT);
1226 }
1227
1228
1229 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1230 &cached_state, GFP_NOFS);
1231
1232 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1233 page_start, page_end - 1, &cached_state,
1234 GFP_NOFS);
1235
1236 for (i = 0; i < i_done; i++) {
1237 clear_page_dirty_for_io(pages[i]);
1238 ClearPageChecked(pages[i]);
1239 set_page_extent_mapped(pages[i]);
1240 set_page_dirty(pages[i]);
1241 unlock_page(pages[i]);
1242 page_cache_release(pages[i]);
1243 }
1244 return i_done;
1245 out:
1246 for (i = 0; i < i_done; i++) {
1247 unlock_page(pages[i]);
1248 page_cache_release(pages[i]);
1249 }
1250 btrfs_delalloc_release_space(inode,
1251 start_index << PAGE_CACHE_SHIFT,
1252 page_cnt << PAGE_CACHE_SHIFT);
1253 return ret;
1254
1255 }
1256
1257 int btrfs_defrag_file(struct inode *inode, struct file *file,
1258 struct btrfs_ioctl_defrag_range_args *range,
1259 u64 newer_than, unsigned long max_to_defrag)
1260 {
1261 struct btrfs_root *root = BTRFS_I(inode)->root;
1262 struct file_ra_state *ra = NULL;
1263 unsigned long last_index;
1264 u64 isize = i_size_read(inode);
1265 u64 last_len = 0;
1266 u64 skip = 0;
1267 u64 defrag_end = 0;
1268 u64 newer_off = range->start;
1269 unsigned long i;
1270 unsigned long ra_index = 0;
1271 int ret;
1272 int defrag_count = 0;
1273 int compress_type = BTRFS_COMPRESS_ZLIB;
1274 u32 extent_thresh = range->extent_thresh;
1275 unsigned long max_cluster = SZ_256K >> PAGE_CACHE_SHIFT;
1276 unsigned long cluster = max_cluster;
1277 u64 new_align = ~((u64)SZ_128K - 1);
1278 struct page **pages = NULL;
1279
1280 if (isize == 0)
1281 return 0;
1282
1283 if (range->start >= isize)
1284 return -EINVAL;
1285
1286 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1287 if (range->compress_type > BTRFS_COMPRESS_TYPES)
1288 return -EINVAL;
1289 if (range->compress_type)
1290 compress_type = range->compress_type;
1291 }
1292
1293 if (extent_thresh == 0)
1294 extent_thresh = SZ_256K;
1295
1296 /*
1297 * if we were not given a file, allocate a readahead
1298 * context
1299 */
1300 if (!file) {
1301 ra = kzalloc(sizeof(*ra), GFP_NOFS);
1302 if (!ra)
1303 return -ENOMEM;
1304 file_ra_state_init(ra, inode->i_mapping);
1305 } else {
1306 ra = &file->f_ra;
1307 }
1308
1309 pages = kmalloc_array(max_cluster, sizeof(struct page *),
1310 GFP_NOFS);
1311 if (!pages) {
1312 ret = -ENOMEM;
1313 goto out_ra;
1314 }
1315
1316 /* find the last page to defrag */
1317 if (range->start + range->len > range->start) {
1318 last_index = min_t(u64, isize - 1,
1319 range->start + range->len - 1) >> PAGE_CACHE_SHIFT;
1320 } else {
1321 last_index = (isize - 1) >> PAGE_CACHE_SHIFT;
1322 }
1323
1324 if (newer_than) {
1325 ret = find_new_extents(root, inode, newer_than,
1326 &newer_off, SZ_64K);
1327 if (!ret) {
1328 range->start = newer_off;
1329 /*
1330 * we always align our defrag to help keep
1331 * the extents in the file evenly spaced
1332 */
1333 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1334 } else
1335 goto out_ra;
1336 } else {
1337 i = range->start >> PAGE_CACHE_SHIFT;
1338 }
1339 if (!max_to_defrag)
1340 max_to_defrag = last_index - i + 1;
1341
1342 /*
1343 * make writeback starts from i, so the defrag range can be
1344 * written sequentially.
1345 */
1346 if (i < inode->i_mapping->writeback_index)
1347 inode->i_mapping->writeback_index = i;
1348
1349 while (i <= last_index && defrag_count < max_to_defrag &&
1350 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE))) {
1351 /*
1352 * make sure we stop running if someone unmounts
1353 * the FS
1354 */
1355 if (!(inode->i_sb->s_flags & MS_ACTIVE))
1356 break;
1357
1358 if (btrfs_defrag_cancelled(root->fs_info)) {
1359 btrfs_debug(root->fs_info, "defrag_file cancelled");
1360 ret = -EAGAIN;
1361 break;
1362 }
1363
1364 if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
1365 extent_thresh, &last_len, &skip,
1366 &defrag_end, range->flags &
1367 BTRFS_DEFRAG_RANGE_COMPRESS)) {
1368 unsigned long next;
1369 /*
1370 * the should_defrag function tells us how much to skip
1371 * bump our counter by the suggested amount
1372 */
1373 next = DIV_ROUND_UP(skip, PAGE_CACHE_SIZE);
1374 i = max(i + 1, next);
1375 continue;
1376 }
1377
1378 if (!newer_than) {
1379 cluster = (PAGE_CACHE_ALIGN(defrag_end) >>
1380 PAGE_CACHE_SHIFT) - i;
1381 cluster = min(cluster, max_cluster);
1382 } else {
1383 cluster = max_cluster;
1384 }
1385
1386 if (i + cluster > ra_index) {
1387 ra_index = max(i, ra_index);
1388 btrfs_force_ra(inode->i_mapping, ra, file, ra_index,
1389 cluster);
1390 ra_index += cluster;
1391 }
1392
1393 inode_lock(inode);
1394 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
1395 BTRFS_I(inode)->force_compress = compress_type;
1396 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1397 if (ret < 0) {
1398 inode_unlock(inode);
1399 goto out_ra;
1400 }
1401
1402 defrag_count += ret;
1403 balance_dirty_pages_ratelimited(inode->i_mapping);
1404 inode_unlock(inode);
1405
1406 if (newer_than) {
1407 if (newer_off == (u64)-1)
1408 break;
1409
1410 if (ret > 0)
1411 i += ret;
1412
1413 newer_off = max(newer_off + 1,
1414 (u64)i << PAGE_CACHE_SHIFT);
1415
1416 ret = find_new_extents(root, inode, newer_than,
1417 &newer_off, SZ_64K);
1418 if (!ret) {
1419 range->start = newer_off;
1420 i = (newer_off & new_align) >> PAGE_CACHE_SHIFT;
1421 } else {
1422 break;
1423 }
1424 } else {
1425 if (ret > 0) {
1426 i += ret;
1427 last_len += ret << PAGE_CACHE_SHIFT;
1428 } else {
1429 i++;
1430 last_len = 0;
1431 }
1432 }
1433 }
1434
1435 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1436 filemap_flush(inode->i_mapping);
1437 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1438 &BTRFS_I(inode)->runtime_flags))
1439 filemap_flush(inode->i_mapping);
1440 }
1441
1442 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
1443 /* the filemap_flush will queue IO into the worker threads, but
1444 * we have to make sure the IO is actually started and that
1445 * ordered extents get created before we return
1446 */
1447 atomic_inc(&root->fs_info->async_submit_draining);
1448 while (atomic_read(&root->fs_info->nr_async_submits) ||
1449 atomic_read(&root->fs_info->async_delalloc_pages)) {
1450 wait_event(root->fs_info->async_submit_wait,
1451 (atomic_read(&root->fs_info->nr_async_submits) == 0 &&
1452 atomic_read(&root->fs_info->async_delalloc_pages) == 0));
1453 }
1454 atomic_dec(&root->fs_info->async_submit_draining);
1455 }
1456
1457 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1458 btrfs_set_fs_incompat(root->fs_info, COMPRESS_LZO);
1459 }
1460
1461 ret = defrag_count;
1462
1463 out_ra:
1464 if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
1465 inode_lock(inode);
1466 BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
1467 inode_unlock(inode);
1468 }
1469 if (!file)
1470 kfree(ra);
1471 kfree(pages);
1472 return ret;
1473 }
1474
1475 static noinline int btrfs_ioctl_resize(struct file *file,
1476 void __user *arg)
1477 {
1478 u64 new_size;
1479 u64 old_size;
1480 u64 devid = 1;
1481 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
1482 struct btrfs_ioctl_vol_args *vol_args;
1483 struct btrfs_trans_handle *trans;
1484 struct btrfs_device *device = NULL;
1485 char *sizestr;
1486 char *retptr;
1487 char *devstr = NULL;
1488 int ret = 0;
1489 int mod = 0;
1490
1491 if (!capable(CAP_SYS_ADMIN))
1492 return -EPERM;
1493
1494 ret = mnt_want_write_file(file);
1495 if (ret)
1496 return ret;
1497
1498 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
1499 1)) {
1500 mnt_drop_write_file(file);
1501 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1502 }
1503
1504 mutex_lock(&root->fs_info->volume_mutex);
1505 vol_args = memdup_user(arg, sizeof(*vol_args));
1506 if (IS_ERR(vol_args)) {
1507 ret = PTR_ERR(vol_args);
1508 goto out;
1509 }
1510
1511 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1512
1513 sizestr = vol_args->name;
1514 devstr = strchr(sizestr, ':');
1515 if (devstr) {
1516 sizestr = devstr + 1;
1517 *devstr = '\0';
1518 devstr = vol_args->name;
1519 ret = kstrtoull(devstr, 10, &devid);
1520 if (ret)
1521 goto out_free;
1522 if (!devid) {
1523 ret = -EINVAL;
1524 goto out_free;
1525 }
1526 btrfs_info(root->fs_info, "resizing devid %llu", devid);
1527 }
1528
1529 device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
1530 if (!device) {
1531 btrfs_info(root->fs_info, "resizer unable to find device %llu",
1532 devid);
1533 ret = -ENODEV;
1534 goto out_free;
1535 }
1536
1537 if (!device->writeable) {
1538 btrfs_info(root->fs_info,
1539 "resizer unable to apply on readonly device %llu",
1540 devid);
1541 ret = -EPERM;
1542 goto out_free;
1543 }
1544
1545 if (!strcmp(sizestr, "max"))
1546 new_size = device->bdev->bd_inode->i_size;
1547 else {
1548 if (sizestr[0] == '-') {
1549 mod = -1;
1550 sizestr++;
1551 } else if (sizestr[0] == '+') {
1552 mod = 1;
1553 sizestr++;
1554 }
1555 new_size = memparse(sizestr, &retptr);
1556 if (*retptr != '\0' || new_size == 0) {
1557 ret = -EINVAL;
1558 goto out_free;
1559 }
1560 }
1561
1562 if (device->is_tgtdev_for_dev_replace) {
1563 ret = -EPERM;
1564 goto out_free;
1565 }
1566
1567 old_size = btrfs_device_get_total_bytes(device);
1568
1569 if (mod < 0) {
1570 if (new_size > old_size) {
1571 ret = -EINVAL;
1572 goto out_free;
1573 }
1574 new_size = old_size - new_size;
1575 } else if (mod > 0) {
1576 if (new_size > ULLONG_MAX - old_size) {
1577 ret = -ERANGE;
1578 goto out_free;
1579 }
1580 new_size = old_size + new_size;
1581 }
1582
1583 if (new_size < SZ_256M) {
1584 ret = -EINVAL;
1585 goto out_free;
1586 }
1587 if (new_size > device->bdev->bd_inode->i_size) {
1588 ret = -EFBIG;
1589 goto out_free;
1590 }
1591
1592 new_size = div_u64(new_size, root->sectorsize);
1593 new_size *= root->sectorsize;
1594
1595 btrfs_info_in_rcu(root->fs_info, "new size for %s is %llu",
1596 rcu_str_deref(device->name), new_size);
1597
1598 if (new_size > old_size) {
1599 trans = btrfs_start_transaction(root, 0);
1600 if (IS_ERR(trans)) {
1601 ret = PTR_ERR(trans);
1602 goto out_free;
1603 }
1604 ret = btrfs_grow_device(trans, device, new_size);
1605 btrfs_commit_transaction(trans, root);
1606 } else if (new_size < old_size) {
1607 ret = btrfs_shrink_device(device, new_size);
1608 } /* equal, nothing need to do */
1609
1610 out_free:
1611 kfree(vol_args);
1612 out:
1613 mutex_unlock(&root->fs_info->volume_mutex);
1614 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
1615 mnt_drop_write_file(file);
1616 return ret;
1617 }
1618
1619 static noinline int btrfs_ioctl_snap_create_transid(struct file *file,
1620 char *name, unsigned long fd, int subvol,
1621 u64 *transid, bool readonly,
1622 struct btrfs_qgroup_inherit *inherit)
1623 {
1624 int namelen;
1625 int ret = 0;
1626
1627 ret = mnt_want_write_file(file);
1628 if (ret)
1629 goto out;
1630
1631 namelen = strlen(name);
1632 if (strchr(name, '/')) {
1633 ret = -EINVAL;
1634 goto out_drop_write;
1635 }
1636
1637 if (name[0] == '.' &&
1638 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1639 ret = -EEXIST;
1640 goto out_drop_write;
1641 }
1642
1643 if (subvol) {
1644 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1645 NULL, transid, readonly, inherit);
1646 } else {
1647 struct fd src = fdget(fd);
1648 struct inode *src_inode;
1649 if (!src.file) {
1650 ret = -EINVAL;
1651 goto out_drop_write;
1652 }
1653
1654 src_inode = file_inode(src.file);
1655 if (src_inode->i_sb != file_inode(file)->i_sb) {
1656 btrfs_info(BTRFS_I(src_inode)->root->fs_info,
1657 "Snapshot src from another FS");
1658 ret = -EXDEV;
1659 } else if (!inode_owner_or_capable(src_inode)) {
1660 /*
1661 * Subvolume creation is not restricted, but snapshots
1662 * are limited to own subvolumes only
1663 */
1664 ret = -EPERM;
1665 } else {
1666 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1667 BTRFS_I(src_inode)->root,
1668 transid, readonly, inherit);
1669 }
1670 fdput(src);
1671 }
1672 out_drop_write:
1673 mnt_drop_write_file(file);
1674 out:
1675 return ret;
1676 }
1677
1678 static noinline int btrfs_ioctl_snap_create(struct file *file,
1679 void __user *arg, int subvol)
1680 {
1681 struct btrfs_ioctl_vol_args *vol_args;
1682 int ret;
1683
1684 vol_args = memdup_user(arg, sizeof(*vol_args));
1685 if (IS_ERR(vol_args))
1686 return PTR_ERR(vol_args);
1687 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1688
1689 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1690 vol_args->fd, subvol,
1691 NULL, false, NULL);
1692
1693 kfree(vol_args);
1694 return ret;
1695 }
1696
1697 static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1698 void __user *arg, int subvol)
1699 {
1700 struct btrfs_ioctl_vol_args_v2 *vol_args;
1701 int ret;
1702 u64 transid = 0;
1703 u64 *ptr = NULL;
1704 bool readonly = false;
1705 struct btrfs_qgroup_inherit *inherit = NULL;
1706
1707 vol_args = memdup_user(arg, sizeof(*vol_args));
1708 if (IS_ERR(vol_args))
1709 return PTR_ERR(vol_args);
1710 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1711
1712 if (vol_args->flags &
1713 ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY |
1714 BTRFS_SUBVOL_QGROUP_INHERIT)) {
1715 ret = -EOPNOTSUPP;
1716 goto free_args;
1717 }
1718
1719 if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC)
1720 ptr = &transid;
1721 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1722 readonly = true;
1723 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1724 if (vol_args->size > PAGE_CACHE_SIZE) {
1725 ret = -EINVAL;
1726 goto free_args;
1727 }
1728 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1729 if (IS_ERR(inherit)) {
1730 ret = PTR_ERR(inherit);
1731 goto free_args;
1732 }
1733 }
1734
1735 ret = btrfs_ioctl_snap_create_transid(file, vol_args->name,
1736 vol_args->fd, subvol, ptr,
1737 readonly, inherit);
1738 if (ret)
1739 goto free_inherit;
1740
1741 if (ptr && copy_to_user(arg +
1742 offsetof(struct btrfs_ioctl_vol_args_v2,
1743 transid),
1744 ptr, sizeof(*ptr)))
1745 ret = -EFAULT;
1746
1747 free_inherit:
1748 kfree(inherit);
1749 free_args:
1750 kfree(vol_args);
1751 return ret;
1752 }
1753
1754 static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1755 void __user *arg)
1756 {
1757 struct inode *inode = file_inode(file);
1758 struct btrfs_root *root = BTRFS_I(inode)->root;
1759 int ret = 0;
1760 u64 flags = 0;
1761
1762 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID)
1763 return -EINVAL;
1764
1765 down_read(&root->fs_info->subvol_sem);
1766 if (btrfs_root_readonly(root))
1767 flags |= BTRFS_SUBVOL_RDONLY;
1768 up_read(&root->fs_info->subvol_sem);
1769
1770 if (copy_to_user(arg, &flags, sizeof(flags)))
1771 ret = -EFAULT;
1772
1773 return ret;
1774 }
1775
1776 static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1777 void __user *arg)
1778 {
1779 struct inode *inode = file_inode(file);
1780 struct btrfs_root *root = BTRFS_I(inode)->root;
1781 struct btrfs_trans_handle *trans;
1782 u64 root_flags;
1783 u64 flags;
1784 int ret = 0;
1785
1786 if (!inode_owner_or_capable(inode))
1787 return -EPERM;
1788
1789 ret = mnt_want_write_file(file);
1790 if (ret)
1791 goto out;
1792
1793 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
1794 ret = -EINVAL;
1795 goto out_drop_write;
1796 }
1797
1798 if (copy_from_user(&flags, arg, sizeof(flags))) {
1799 ret = -EFAULT;
1800 goto out_drop_write;
1801 }
1802
1803 if (flags & BTRFS_SUBVOL_CREATE_ASYNC) {
1804 ret = -EINVAL;
1805 goto out_drop_write;
1806 }
1807
1808 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1809 ret = -EOPNOTSUPP;
1810 goto out_drop_write;
1811 }
1812
1813 down_write(&root->fs_info->subvol_sem);
1814
1815 /* nothing to do */
1816 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
1817 goto out_drop_sem;
1818
1819 root_flags = btrfs_root_flags(&root->root_item);
1820 if (flags & BTRFS_SUBVOL_RDONLY) {
1821 btrfs_set_root_flags(&root->root_item,
1822 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
1823 } else {
1824 /*
1825 * Block RO -> RW transition if this subvolume is involved in
1826 * send
1827 */
1828 spin_lock(&root->root_item_lock);
1829 if (root->send_in_progress == 0) {
1830 btrfs_set_root_flags(&root->root_item,
1831 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
1832 spin_unlock(&root->root_item_lock);
1833 } else {
1834 spin_unlock(&root->root_item_lock);
1835 btrfs_warn(root->fs_info,
1836 "Attempt to set subvolume %llu read-write during send",
1837 root->root_key.objectid);
1838 ret = -EPERM;
1839 goto out_drop_sem;
1840 }
1841 }
1842
1843 trans = btrfs_start_transaction(root, 1);
1844 if (IS_ERR(trans)) {
1845 ret = PTR_ERR(trans);
1846 goto out_reset;
1847 }
1848
1849 ret = btrfs_update_root(trans, root->fs_info->tree_root,
1850 &root->root_key, &root->root_item);
1851
1852 btrfs_commit_transaction(trans, root);
1853 out_reset:
1854 if (ret)
1855 btrfs_set_root_flags(&root->root_item, root_flags);
1856 out_drop_sem:
1857 up_write(&root->fs_info->subvol_sem);
1858 out_drop_write:
1859 mnt_drop_write_file(file);
1860 out:
1861 return ret;
1862 }
1863
1864 /*
1865 * helper to check if the subvolume references other subvolumes
1866 */
1867 static noinline int may_destroy_subvol(struct btrfs_root *root)
1868 {
1869 struct btrfs_path *path;
1870 struct btrfs_dir_item *di;
1871 struct btrfs_key key;
1872 u64 dir_id;
1873 int ret;
1874
1875 path = btrfs_alloc_path();
1876 if (!path)
1877 return -ENOMEM;
1878
1879 /* Make sure this root isn't set as the default subvol */
1880 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
1881 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path,
1882 dir_id, "default", 7, 0);
1883 if (di && !IS_ERR(di)) {
1884 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key);
1885 if (key.objectid == root->root_key.objectid) {
1886 ret = -EPERM;
1887 btrfs_err(root->fs_info, "deleting default subvolume "
1888 "%llu is not allowed", key.objectid);
1889 goto out;
1890 }
1891 btrfs_release_path(path);
1892 }
1893
1894 key.objectid = root->root_key.objectid;
1895 key.type = BTRFS_ROOT_REF_KEY;
1896 key.offset = (u64)-1;
1897
1898 ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
1899 &key, path, 0, 0);
1900 if (ret < 0)
1901 goto out;
1902 BUG_ON(ret == 0);
1903
1904 ret = 0;
1905 if (path->slots[0] > 0) {
1906 path->slots[0]--;
1907 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1908 if (key.objectid == root->root_key.objectid &&
1909 key.type == BTRFS_ROOT_REF_KEY)
1910 ret = -ENOTEMPTY;
1911 }
1912 out:
1913 btrfs_free_path(path);
1914 return ret;
1915 }
1916
1917 static noinline int key_in_sk(struct btrfs_key *key,
1918 struct btrfs_ioctl_search_key *sk)
1919 {
1920 struct btrfs_key test;
1921 int ret;
1922
1923 test.objectid = sk->min_objectid;
1924 test.type = sk->min_type;
1925 test.offset = sk->min_offset;
1926
1927 ret = btrfs_comp_cpu_keys(key, &test);
1928 if (ret < 0)
1929 return 0;
1930
1931 test.objectid = sk->max_objectid;
1932 test.type = sk->max_type;
1933 test.offset = sk->max_offset;
1934
1935 ret = btrfs_comp_cpu_keys(key, &test);
1936 if (ret > 0)
1937 return 0;
1938 return 1;
1939 }
1940
1941 static noinline int copy_to_sk(struct btrfs_root *root,
1942 struct btrfs_path *path,
1943 struct btrfs_key *key,
1944 struct btrfs_ioctl_search_key *sk,
1945 size_t *buf_size,
1946 char __user *ubuf,
1947 unsigned long *sk_offset,
1948 int *num_found)
1949 {
1950 u64 found_transid;
1951 struct extent_buffer *leaf;
1952 struct btrfs_ioctl_search_header sh;
1953 struct btrfs_key test;
1954 unsigned long item_off;
1955 unsigned long item_len;
1956 int nritems;
1957 int i;
1958 int slot;
1959 int ret = 0;
1960
1961 leaf = path->nodes[0];
1962 slot = path->slots[0];
1963 nritems = btrfs_header_nritems(leaf);
1964
1965 if (btrfs_header_generation(leaf) > sk->max_transid) {
1966 i = nritems;
1967 goto advance_key;
1968 }
1969 found_transid = btrfs_header_generation(leaf);
1970
1971 for (i = slot; i < nritems; i++) {
1972 item_off = btrfs_item_ptr_offset(leaf, i);
1973 item_len = btrfs_item_size_nr(leaf, i);
1974
1975 btrfs_item_key_to_cpu(leaf, key, i);
1976 if (!key_in_sk(key, sk))
1977 continue;
1978
1979 if (sizeof(sh) + item_len > *buf_size) {
1980 if (*num_found) {
1981 ret = 1;
1982 goto out;
1983 }
1984
1985 /*
1986 * return one empty item back for v1, which does not
1987 * handle -EOVERFLOW
1988 */
1989
1990 *buf_size = sizeof(sh) + item_len;
1991 item_len = 0;
1992 ret = -EOVERFLOW;
1993 }
1994
1995 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
1996 ret = 1;
1997 goto out;
1998 }
1999
2000 sh.objectid = key->objectid;
2001 sh.offset = key->offset;
2002 sh.type = key->type;
2003 sh.len = item_len;
2004 sh.transid = found_transid;
2005
2006 /* copy search result header */
2007 if (copy_to_user(ubuf + *sk_offset, &sh, sizeof(sh))) {
2008 ret = -EFAULT;
2009 goto out;
2010 }
2011
2012 *sk_offset += sizeof(sh);
2013
2014 if (item_len) {
2015 char __user *up = ubuf + *sk_offset;
2016 /* copy the item */
2017 if (read_extent_buffer_to_user(leaf, up,
2018 item_off, item_len)) {
2019 ret = -EFAULT;
2020 goto out;
2021 }
2022
2023 *sk_offset += item_len;
2024 }
2025 (*num_found)++;
2026
2027 if (ret) /* -EOVERFLOW from above */
2028 goto out;
2029
2030 if (*num_found >= sk->nr_items) {
2031 ret = 1;
2032 goto out;
2033 }
2034 }
2035 advance_key:
2036 ret = 0;
2037 test.objectid = sk->max_objectid;
2038 test.type = sk->max_type;
2039 test.offset = sk->max_offset;
2040 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2041 ret = 1;
2042 else if (key->offset < (u64)-1)
2043 key->offset++;
2044 else if (key->type < (u8)-1) {
2045 key->offset = 0;
2046 key->type++;
2047 } else if (key->objectid < (u64)-1) {
2048 key->offset = 0;
2049 key->type = 0;
2050 key->objectid++;
2051 } else
2052 ret = 1;
2053 out:
2054 /*
2055 * 0: all items from this leaf copied, continue with next
2056 * 1: * more items can be copied, but unused buffer is too small
2057 * * all items were found
2058 * Either way, it will stops the loop which iterates to the next
2059 * leaf
2060 * -EOVERFLOW: item was to large for buffer
2061 * -EFAULT: could not copy extent buffer back to userspace
2062 */
2063 return ret;
2064 }
2065
2066 static noinline int search_ioctl(struct inode *inode,
2067 struct btrfs_ioctl_search_key *sk,
2068 size_t *buf_size,
2069 char __user *ubuf)
2070 {
2071 struct btrfs_root *root;
2072 struct btrfs_key key;
2073 struct btrfs_path *path;
2074 struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info;
2075 int ret;
2076 int num_found = 0;
2077 unsigned long sk_offset = 0;
2078
2079 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2080 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2081 return -EOVERFLOW;
2082 }
2083
2084 path = btrfs_alloc_path();
2085 if (!path)
2086 return -ENOMEM;
2087
2088 if (sk->tree_id == 0) {
2089 /* search the root of the inode that was passed */
2090 root = BTRFS_I(inode)->root;
2091 } else {
2092 key.objectid = sk->tree_id;
2093 key.type = BTRFS_ROOT_ITEM_KEY;
2094 key.offset = (u64)-1;
2095 root = btrfs_read_fs_root_no_name(info, &key);
2096 if (IS_ERR(root)) {
2097 btrfs_free_path(path);
2098 return -ENOENT;
2099 }
2100 }
2101
2102 key.objectid = sk->min_objectid;
2103 key.type = sk->min_type;
2104 key.offset = sk->min_offset;
2105
2106 while (1) {
2107 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2108 if (ret != 0) {
2109 if (ret > 0)
2110 ret = 0;
2111 goto err;
2112 }
2113 ret = copy_to_sk(root, path, &key, sk, buf_size, ubuf,
2114 &sk_offset, &num_found);
2115 btrfs_release_path(path);
2116 if (ret)
2117 break;
2118
2119 }
2120 if (ret > 0)
2121 ret = 0;
2122 err:
2123 sk->nr_items = num_found;
2124 btrfs_free_path(path);
2125 return ret;
2126 }
2127
2128 static noinline int btrfs_ioctl_tree_search(struct file *file,
2129 void __user *argp)
2130 {
2131 struct btrfs_ioctl_search_args __user *uargs;
2132 struct btrfs_ioctl_search_key sk;
2133 struct inode *inode;
2134 int ret;
2135 size_t buf_size;
2136
2137 if (!capable(CAP_SYS_ADMIN))
2138 return -EPERM;
2139
2140 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2141
2142 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2143 return -EFAULT;
2144
2145 buf_size = sizeof(uargs->buf);
2146
2147 inode = file_inode(file);
2148 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2149
2150 /*
2151 * In the origin implementation an overflow is handled by returning a
2152 * search header with a len of zero, so reset ret.
2153 */
2154 if (ret == -EOVERFLOW)
2155 ret = 0;
2156
2157 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2158 ret = -EFAULT;
2159 return ret;
2160 }
2161
2162 static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2163 void __user *argp)
2164 {
2165 struct btrfs_ioctl_search_args_v2 __user *uarg;
2166 struct btrfs_ioctl_search_args_v2 args;
2167 struct inode *inode;
2168 int ret;
2169 size_t buf_size;
2170 const size_t buf_limit = SZ_16M;
2171
2172 if (!capable(CAP_SYS_ADMIN))
2173 return -EPERM;
2174
2175 /* copy search header and buffer size */
2176 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2177 if (copy_from_user(&args, uarg, sizeof(args)))
2178 return -EFAULT;
2179
2180 buf_size = args.buf_size;
2181
2182 if (buf_size < sizeof(struct btrfs_ioctl_search_header))
2183 return -EOVERFLOW;
2184
2185 /* limit result size to 16MB */
2186 if (buf_size > buf_limit)
2187 buf_size = buf_limit;
2188
2189 inode = file_inode(file);
2190 ret = search_ioctl(inode, &args.key, &buf_size,
2191 (char *)(&uarg->buf[0]));
2192 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2193 ret = -EFAULT;
2194 else if (ret == -EOVERFLOW &&
2195 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2196 ret = -EFAULT;
2197
2198 return ret;
2199 }
2200
2201 /*
2202 * Search INODE_REFs to identify path name of 'dirid' directory
2203 * in a 'tree_id' tree. and sets path name to 'name'.
2204 */
2205 static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2206 u64 tree_id, u64 dirid, char *name)
2207 {
2208 struct btrfs_root *root;
2209 struct btrfs_key key;
2210 char *ptr;
2211 int ret = -1;
2212 int slot;
2213 int len;
2214 int total_len = 0;
2215 struct btrfs_inode_ref *iref;
2216 struct extent_buffer *l;
2217 struct btrfs_path *path;
2218
2219 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2220 name[0]='\0';
2221 return 0;
2222 }
2223
2224 path = btrfs_alloc_path();
2225 if (!path)
2226 return -ENOMEM;
2227
2228 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX];
2229
2230 key.objectid = tree_id;
2231 key.type = BTRFS_ROOT_ITEM_KEY;
2232 key.offset = (u64)-1;
2233 root = btrfs_read_fs_root_no_name(info, &key);
2234 if (IS_ERR(root)) {
2235 btrfs_err(info, "could not find root %llu", tree_id);
2236 ret = -ENOENT;
2237 goto out;
2238 }
2239
2240 key.objectid = dirid;
2241 key.type = BTRFS_INODE_REF_KEY;
2242 key.offset = (u64)-1;
2243
2244 while (1) {
2245 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2246 if (ret < 0)
2247 goto out;
2248 else if (ret > 0) {
2249 ret = btrfs_previous_item(root, path, dirid,
2250 BTRFS_INODE_REF_KEY);
2251 if (ret < 0)
2252 goto out;
2253 else if (ret > 0) {
2254 ret = -ENOENT;
2255 goto out;
2256 }
2257 }
2258
2259 l = path->nodes[0];
2260 slot = path->slots[0];
2261 btrfs_item_key_to_cpu(l, &key, slot);
2262
2263 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2264 len = btrfs_inode_ref_name_len(l, iref);
2265 ptr -= len + 1;
2266 total_len += len + 1;
2267 if (ptr < name) {
2268 ret = -ENAMETOOLONG;
2269 goto out;
2270 }
2271
2272 *(ptr + len) = '/';
2273 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2274
2275 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2276 break;
2277
2278 btrfs_release_path(path);
2279 key.objectid = key.offset;
2280 key.offset = (u64)-1;
2281 dirid = key.objectid;
2282 }
2283 memmove(name, ptr, total_len);
2284 name[total_len] = '\0';
2285 ret = 0;
2286 out:
2287 btrfs_free_path(path);
2288 return ret;
2289 }
2290
2291 static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2292 void __user *argp)
2293 {
2294 struct btrfs_ioctl_ino_lookup_args *args;
2295 struct inode *inode;
2296 int ret = 0;
2297
2298 args = memdup_user(argp, sizeof(*args));
2299 if (IS_ERR(args))
2300 return PTR_ERR(args);
2301
2302 inode = file_inode(file);
2303
2304 /*
2305 * Unprivileged query to obtain the containing subvolume root id. The
2306 * path is reset so it's consistent with btrfs_search_path_in_tree.
2307 */
2308 if (args->treeid == 0)
2309 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2310
2311 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2312 args->name[0] = 0;
2313 goto out;
2314 }
2315
2316 if (!capable(CAP_SYS_ADMIN)) {
2317 ret = -EPERM;
2318 goto out;
2319 }
2320
2321 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2322 args->treeid, args->objectid,
2323 args->name);
2324
2325 out:
2326 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2327 ret = -EFAULT;
2328
2329 kfree(args);
2330 return ret;
2331 }
2332
2333 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2334 void __user *arg)
2335 {
2336 struct dentry *parent = file->f_path.dentry;
2337 struct dentry *dentry;
2338 struct inode *dir = d_inode(parent);
2339 struct inode *inode;
2340 struct btrfs_root *root = BTRFS_I(dir)->root;
2341 struct btrfs_root *dest = NULL;
2342 struct btrfs_ioctl_vol_args *vol_args;
2343 struct btrfs_trans_handle *trans;
2344 struct btrfs_block_rsv block_rsv;
2345 u64 root_flags;
2346 u64 qgroup_reserved;
2347 int namelen;
2348 int ret;
2349 int err = 0;
2350
2351 vol_args = memdup_user(arg, sizeof(*vol_args));
2352 if (IS_ERR(vol_args))
2353 return PTR_ERR(vol_args);
2354
2355 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2356 namelen = strlen(vol_args->name);
2357 if (strchr(vol_args->name, '/') ||
2358 strncmp(vol_args->name, "..", namelen) == 0) {
2359 err = -EINVAL;
2360 goto out;
2361 }
2362
2363 err = mnt_want_write_file(file);
2364 if (err)
2365 goto out;
2366
2367
2368 err = mutex_lock_killable_nested(&dir->i_mutex, I_MUTEX_PARENT);
2369 if (err == -EINTR)
2370 goto out_drop_write;
2371 dentry = lookup_one_len(vol_args->name, parent, namelen);
2372 if (IS_ERR(dentry)) {
2373 err = PTR_ERR(dentry);
2374 goto out_unlock_dir;
2375 }
2376
2377 if (d_really_is_negative(dentry)) {
2378 err = -ENOENT;
2379 goto out_dput;
2380 }
2381
2382 inode = d_inode(dentry);
2383 dest = BTRFS_I(inode)->root;
2384 if (!capable(CAP_SYS_ADMIN)) {
2385 /*
2386 * Regular user. Only allow this with a special mount
2387 * option, when the user has write+exec access to the
2388 * subvol root, and when rmdir(2) would have been
2389 * allowed.
2390 *
2391 * Note that this is _not_ check that the subvol is
2392 * empty or doesn't contain data that we wouldn't
2393 * otherwise be able to delete.
2394 *
2395 * Users who want to delete empty subvols should try
2396 * rmdir(2).
2397 */
2398 err = -EPERM;
2399 if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
2400 goto out_dput;
2401
2402 /*
2403 * Do not allow deletion if the parent dir is the same
2404 * as the dir to be deleted. That means the ioctl
2405 * must be called on the dentry referencing the root
2406 * of the subvol, not a random directory contained
2407 * within it.
2408 */
2409 err = -EINVAL;
2410 if (root == dest)
2411 goto out_dput;
2412
2413 err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
2414 if (err)
2415 goto out_dput;
2416 }
2417
2418 /* check if subvolume may be deleted by a user */
2419 err = btrfs_may_delete(dir, dentry, 1);
2420 if (err)
2421 goto out_dput;
2422
2423 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
2424 err = -EINVAL;
2425 goto out_dput;
2426 }
2427
2428 inode_lock(inode);
2429
2430 /*
2431 * Don't allow to delete a subvolume with send in progress. This is
2432 * inside the i_mutex so the error handling that has to drop the bit
2433 * again is not run concurrently.
2434 */
2435 spin_lock(&dest->root_item_lock);
2436 root_flags = btrfs_root_flags(&dest->root_item);
2437 if (dest->send_in_progress == 0) {
2438 btrfs_set_root_flags(&dest->root_item,
2439 root_flags | BTRFS_ROOT_SUBVOL_DEAD);
2440 spin_unlock(&dest->root_item_lock);
2441 } else {
2442 spin_unlock(&dest->root_item_lock);
2443 btrfs_warn(root->fs_info,
2444 "Attempt to delete subvolume %llu during send",
2445 dest->root_key.objectid);
2446 err = -EPERM;
2447 goto out_unlock_inode;
2448 }
2449
2450 down_write(&root->fs_info->subvol_sem);
2451
2452 err = may_destroy_subvol(dest);
2453 if (err)
2454 goto out_up_write;
2455
2456 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
2457 /*
2458 * One for dir inode, two for dir entries, two for root
2459 * ref/backref.
2460 */
2461 err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
2462 5, &qgroup_reserved, true);
2463 if (err)
2464 goto out_up_write;
2465
2466 trans = btrfs_start_transaction(root, 0);
2467 if (IS_ERR(trans)) {
2468 err = PTR_ERR(trans);
2469 goto out_release;
2470 }
2471 trans->block_rsv = &block_rsv;
2472 trans->bytes_reserved = block_rsv.size;
2473
2474 btrfs_record_snapshot_destroy(trans, dir);
2475
2476 ret = btrfs_unlink_subvol(trans, root, dir,
2477 dest->root_key.objectid,
2478 dentry->d_name.name,
2479 dentry->d_name.len);
2480 if (ret) {
2481 err = ret;
2482 btrfs_abort_transaction(trans, root, ret);
2483 goto out_end_trans;
2484 }
2485
2486 btrfs_record_root_in_trans(trans, dest);
2487
2488 memset(&dest->root_item.drop_progress, 0,
2489 sizeof(dest->root_item.drop_progress));
2490 dest->root_item.drop_level = 0;
2491 btrfs_set_root_refs(&dest->root_item, 0);
2492
2493 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
2494 ret = btrfs_insert_orphan_item(trans,
2495 root->fs_info->tree_root,
2496 dest->root_key.objectid);
2497 if (ret) {
2498 btrfs_abort_transaction(trans, root, ret);
2499 err = ret;
2500 goto out_end_trans;
2501 }
2502 }
2503
2504 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2505 dest->root_item.uuid, BTRFS_UUID_KEY_SUBVOL,
2506 dest->root_key.objectid);
2507 if (ret && ret != -ENOENT) {
2508 btrfs_abort_transaction(trans, root, ret);
2509 err = ret;
2510 goto out_end_trans;
2511 }
2512 if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
2513 ret = btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
2514 dest->root_item.received_uuid,
2515 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
2516 dest->root_key.objectid);
2517 if (ret && ret != -ENOENT) {
2518 btrfs_abort_transaction(trans, root, ret);
2519 err = ret;
2520 goto out_end_trans;
2521 }
2522 }
2523
2524 out_end_trans:
2525 trans->block_rsv = NULL;
2526 trans->bytes_reserved = 0;
2527 ret = btrfs_end_transaction(trans, root);
2528 if (ret && !err)
2529 err = ret;
2530 inode->i_flags |= S_DEAD;
2531 out_release:
2532 btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
2533 out_up_write:
2534 up_write(&root->fs_info->subvol_sem);
2535 if (err) {
2536 spin_lock(&dest->root_item_lock);
2537 root_flags = btrfs_root_flags(&dest->root_item);
2538 btrfs_set_root_flags(&dest->root_item,
2539 root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
2540 spin_unlock(&dest->root_item_lock);
2541 }
2542 out_unlock_inode:
2543 inode_unlock(inode);
2544 if (!err) {
2545 d_invalidate(dentry);
2546 btrfs_invalidate_inodes(dest);
2547 d_delete(dentry);
2548 ASSERT(dest->send_in_progress == 0);
2549
2550 /* the last ref */
2551 if (dest->ino_cache_inode) {
2552 iput(dest->ino_cache_inode);
2553 dest->ino_cache_inode = NULL;
2554 }
2555 }
2556 out_dput:
2557 dput(dentry);
2558 out_unlock_dir:
2559 inode_unlock(dir);
2560 out_drop_write:
2561 mnt_drop_write_file(file);
2562 out:
2563 kfree(vol_args);
2564 return err;
2565 }
2566
2567 static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
2568 {
2569 struct inode *inode = file_inode(file);
2570 struct btrfs_root *root = BTRFS_I(inode)->root;
2571 struct btrfs_ioctl_defrag_range_args *range;
2572 int ret;
2573
2574 ret = mnt_want_write_file(file);
2575 if (ret)
2576 return ret;
2577
2578 if (btrfs_root_readonly(root)) {
2579 ret = -EROFS;
2580 goto out;
2581 }
2582
2583 switch (inode->i_mode & S_IFMT) {
2584 case S_IFDIR:
2585 if (!capable(CAP_SYS_ADMIN)) {
2586 ret = -EPERM;
2587 goto out;
2588 }
2589 ret = btrfs_defrag_root(root);
2590 if (ret)
2591 goto out;
2592 ret = btrfs_defrag_root(root->fs_info->extent_root);
2593 break;
2594 case S_IFREG:
2595 if (!(file->f_mode & FMODE_WRITE)) {
2596 ret = -EINVAL;
2597 goto out;
2598 }
2599
2600 range = kzalloc(sizeof(*range), GFP_KERNEL);
2601 if (!range) {
2602 ret = -ENOMEM;
2603 goto out;
2604 }
2605
2606 if (argp) {
2607 if (copy_from_user(range, argp,
2608 sizeof(*range))) {
2609 ret = -EFAULT;
2610 kfree(range);
2611 goto out;
2612 }
2613 /* compression requires us to start the IO */
2614 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
2615 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
2616 range->extent_thresh = (u32)-1;
2617 }
2618 } else {
2619 /* the rest are all set to zero by kzalloc */
2620 range->len = (u64)-1;
2621 }
2622 ret = btrfs_defrag_file(file_inode(file), file,
2623 range, 0, 0);
2624 if (ret > 0)
2625 ret = 0;
2626 kfree(range);
2627 break;
2628 default:
2629 ret = -EINVAL;
2630 }
2631 out:
2632 mnt_drop_write_file(file);
2633 return ret;
2634 }
2635
2636 static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
2637 {
2638 struct btrfs_ioctl_vol_args *vol_args;
2639 int ret;
2640
2641 if (!capable(CAP_SYS_ADMIN))
2642 return -EPERM;
2643
2644 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2645 1)) {
2646 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2647 }
2648
2649 mutex_lock(&root->fs_info->volume_mutex);
2650 vol_args = memdup_user(arg, sizeof(*vol_args));
2651 if (IS_ERR(vol_args)) {
2652 ret = PTR_ERR(vol_args);
2653 goto out;
2654 }
2655
2656 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2657 ret = btrfs_init_new_device(root, vol_args->name);
2658
2659 if (!ret)
2660 btrfs_info(root->fs_info, "disk added %s",vol_args->name);
2661
2662 kfree(vol_args);
2663 out:
2664 mutex_unlock(&root->fs_info->volume_mutex);
2665 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2666 return ret;
2667 }
2668
2669 static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
2670 {
2671 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
2672 struct btrfs_ioctl_vol_args *vol_args;
2673 int ret;
2674
2675 if (!capable(CAP_SYS_ADMIN))
2676 return -EPERM;
2677
2678 ret = mnt_want_write_file(file);
2679 if (ret)
2680 return ret;
2681
2682 vol_args = memdup_user(arg, sizeof(*vol_args));
2683 if (IS_ERR(vol_args)) {
2684 ret = PTR_ERR(vol_args);
2685 goto err_drop;
2686 }
2687
2688 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
2689
2690 if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
2691 1)) {
2692 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
2693 goto out;
2694 }
2695
2696 mutex_lock(&root->fs_info->volume_mutex);
2697 ret = btrfs_rm_device(root, vol_args->name);
2698 mutex_unlock(&root->fs_info->volume_mutex);
2699 atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0);
2700
2701 if (!ret)
2702 btrfs_info(root->fs_info, "disk deleted %s",vol_args->name);
2703
2704 out:
2705 kfree(vol_args);
2706 err_drop:
2707 mnt_drop_write_file(file);
2708 return ret;
2709 }
2710
2711 static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
2712 {
2713 struct btrfs_ioctl_fs_info_args *fi_args;
2714 struct btrfs_device *device;
2715 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2716 int ret = 0;
2717
2718 fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
2719 if (!fi_args)
2720 return -ENOMEM;
2721
2722 mutex_lock(&fs_devices->device_list_mutex);
2723 fi_args->num_devices = fs_devices->num_devices;
2724 memcpy(&fi_args->fsid, root->fs_info->fsid, sizeof(fi_args->fsid));
2725
2726 list_for_each_entry(device, &fs_devices->devices, dev_list) {
2727 if (device->devid > fi_args->max_id)
2728 fi_args->max_id = device->devid;
2729 }
2730 mutex_unlock(&fs_devices->device_list_mutex);
2731
2732 fi_args->nodesize = root->fs_info->super_copy->nodesize;
2733 fi_args->sectorsize = root->fs_info->super_copy->sectorsize;
2734 fi_args->clone_alignment = root->fs_info->super_copy->sectorsize;
2735
2736 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
2737 ret = -EFAULT;
2738
2739 kfree(fi_args);
2740 return ret;
2741 }
2742
2743 static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
2744 {
2745 struct btrfs_ioctl_dev_info_args *di_args;
2746 struct btrfs_device *dev;
2747 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
2748 int ret = 0;
2749 char *s_uuid = NULL;
2750
2751 di_args = memdup_user(arg, sizeof(*di_args));
2752 if (IS_ERR(di_args))
2753 return PTR_ERR(di_args);
2754
2755 if (!btrfs_is_empty_uuid(di_args->uuid))
2756 s_uuid = di_args->uuid;
2757
2758 mutex_lock(&fs_devices->device_list_mutex);
2759 dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
2760
2761 if (!dev) {
2762 ret = -ENODEV;
2763 goto out;
2764 }
2765
2766 di_args->devid = dev->devid;
2767 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
2768 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
2769 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
2770 if (dev->name) {
2771 struct rcu_string *name;
2772
2773 rcu_read_lock();
2774 name = rcu_dereference(dev->name);
2775 strncpy(di_args->path, name->str, sizeof(di_args->path));
2776 rcu_read_unlock();
2777 di_args->path[sizeof(di_args->path) - 1] = 0;
2778 } else {
2779 di_args->path[0] = '\0';
2780 }
2781
2782 out:
2783 mutex_unlock(&fs_devices->device_list_mutex);
2784 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
2785 ret = -EFAULT;
2786
2787 kfree(di_args);
2788 return ret;
2789 }
2790
2791 static struct page *extent_same_get_page(struct inode *inode, pgoff_t index)
2792 {
2793 struct page *page;
2794
2795 page = grab_cache_page(inode->i_mapping, index);
2796 if (!page)
2797 return ERR_PTR(-ENOMEM);
2798
2799 if (!PageUptodate(page)) {
2800 int ret;
2801
2802 ret = btrfs_readpage(NULL, page);
2803 if (ret)
2804 return ERR_PTR(ret);
2805 lock_page(page);
2806 if (!PageUptodate(page)) {
2807 unlock_page(page);
2808 page_cache_release(page);
2809 return ERR_PTR(-EIO);
2810 }
2811 if (page->mapping != inode->i_mapping) {
2812 unlock_page(page);
2813 page_cache_release(page);
2814 return ERR_PTR(-EAGAIN);
2815 }
2816 }
2817
2818 return page;
2819 }
2820
2821 static int gather_extent_pages(struct inode *inode, struct page **pages,
2822 int num_pages, u64 off)
2823 {
2824 int i;
2825 pgoff_t index = off >> PAGE_CACHE_SHIFT;
2826
2827 for (i = 0; i < num_pages; i++) {
2828 again:
2829 pages[i] = extent_same_get_page(inode, index + i);
2830 if (IS_ERR(pages[i])) {
2831 int err = PTR_ERR(pages[i]);
2832
2833 if (err == -EAGAIN)
2834 goto again;
2835 pages[i] = NULL;
2836 return err;
2837 }
2838 }
2839 return 0;
2840 }
2841
2842 static int lock_extent_range(struct inode *inode, u64 off, u64 len,
2843 bool retry_range_locking)
2844 {
2845 /*
2846 * Do any pending delalloc/csum calculations on inode, one way or
2847 * another, and lock file content.
2848 * The locking order is:
2849 *
2850 * 1) pages
2851 * 2) range in the inode's io tree
2852 */
2853 while (1) {
2854 struct btrfs_ordered_extent *ordered;
2855 lock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2856 ordered = btrfs_lookup_first_ordered_extent(inode,
2857 off + len - 1);
2858 if ((!ordered ||
2859 ordered->file_offset + ordered->len <= off ||
2860 ordered->file_offset >= off + len) &&
2861 !test_range_bit(&BTRFS_I(inode)->io_tree, off,
2862 off + len - 1, EXTENT_DELALLOC, 0, NULL)) {
2863 if (ordered)
2864 btrfs_put_ordered_extent(ordered);
2865 break;
2866 }
2867 unlock_extent(&BTRFS_I(inode)->io_tree, off, off + len - 1);
2868 if (ordered)
2869 btrfs_put_ordered_extent(ordered);
2870 if (!retry_range_locking)
2871 return -EAGAIN;
2872 btrfs_wait_ordered_range(inode, off, len);
2873 }
2874 return 0;
2875 }
2876
2877 static void btrfs_double_inode_unlock(struct inode *inode1, struct inode *inode2)
2878 {
2879 inode_unlock(inode1);
2880 inode_unlock(inode2);
2881 }
2882
2883 static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
2884 {
2885 if (inode1 < inode2)
2886 swap(inode1, inode2);
2887
2888 inode_lock_nested(inode1, I_MUTEX_PARENT);
2889 inode_lock_nested(inode2, I_MUTEX_CHILD);
2890 }
2891
2892 static void btrfs_double_extent_unlock(struct inode *inode1, u64 loff1,
2893 struct inode *inode2, u64 loff2, u64 len)
2894 {
2895 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1, loff1 + len - 1);
2896 unlock_extent(&BTRFS_I(inode2)->io_tree, loff2, loff2 + len - 1);
2897 }
2898
2899 static int btrfs_double_extent_lock(struct inode *inode1, u64 loff1,
2900 struct inode *inode2, u64 loff2, u64 len,
2901 bool retry_range_locking)
2902 {
2903 int ret;
2904
2905 if (inode1 < inode2) {
2906 swap(inode1, inode2);
2907 swap(loff1, loff2);
2908 }
2909 ret = lock_extent_range(inode1, loff1, len, retry_range_locking);
2910 if (ret)
2911 return ret;
2912 ret = lock_extent_range(inode2, loff2, len, retry_range_locking);
2913 if (ret)
2914 unlock_extent(&BTRFS_I(inode1)->io_tree, loff1,
2915 loff1 + len - 1);
2916 return ret;
2917 }
2918
2919 struct cmp_pages {
2920 int num_pages;
2921 struct page **src_pages;
2922 struct page **dst_pages;
2923 };
2924
2925 static void btrfs_cmp_data_free(struct cmp_pages *cmp)
2926 {
2927 int i;
2928 struct page *pg;
2929
2930 for (i = 0; i < cmp->num_pages; i++) {
2931 pg = cmp->src_pages[i];
2932 if (pg) {
2933 unlock_page(pg);
2934 page_cache_release(pg);
2935 }
2936 pg = cmp->dst_pages[i];
2937 if (pg) {
2938 unlock_page(pg);
2939 page_cache_release(pg);
2940 }
2941 }
2942 kfree(cmp->src_pages);
2943 kfree(cmp->dst_pages);
2944 }
2945
2946 static int btrfs_cmp_data_prepare(struct inode *src, u64 loff,
2947 struct inode *dst, u64 dst_loff,
2948 u64 len, struct cmp_pages *cmp)
2949 {
2950 int ret;
2951 int num_pages = PAGE_CACHE_ALIGN(len) >> PAGE_CACHE_SHIFT;
2952 struct page **src_pgarr, **dst_pgarr;
2953
2954 /*
2955 * We must gather up all the pages before we initiate our
2956 * extent locking. We use an array for the page pointers. Size
2957 * of the array is bounded by len, which is in turn bounded by
2958 * BTRFS_MAX_DEDUPE_LEN.
2959 */
2960 src_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
2961 dst_pgarr = kcalloc(num_pages, sizeof(struct page *), GFP_KERNEL);
2962 if (!src_pgarr || !dst_pgarr) {
2963 kfree(src_pgarr);
2964 kfree(dst_pgarr);
2965 return -ENOMEM;
2966 }
2967 cmp->num_pages = num_pages;
2968 cmp->src_pages = src_pgarr;
2969 cmp->dst_pages = dst_pgarr;
2970
2971 ret = gather_extent_pages(src, cmp->src_pages, cmp->num_pages, loff);
2972 if (ret)
2973 goto out;
2974
2975 ret = gather_extent_pages(dst, cmp->dst_pages, cmp->num_pages, dst_loff);
2976
2977 out:
2978 if (ret)
2979 btrfs_cmp_data_free(cmp);
2980 return 0;
2981 }
2982
2983 static int btrfs_cmp_data(struct inode *src, u64 loff, struct inode *dst,
2984 u64 dst_loff, u64 len, struct cmp_pages *cmp)
2985 {
2986 int ret = 0;
2987 int i;
2988 struct page *src_page, *dst_page;
2989 unsigned int cmp_len = PAGE_CACHE_SIZE;
2990 void *addr, *dst_addr;
2991
2992 i = 0;
2993 while (len) {
2994 if (len < PAGE_CACHE_SIZE)
2995 cmp_len = len;
2996
2997 BUG_ON(i >= cmp->num_pages);
2998
2999 src_page = cmp->src_pages[i];
3000 dst_page = cmp->dst_pages[i];
3001 ASSERT(PageLocked(src_page));
3002 ASSERT(PageLocked(dst_page));
3003
3004 addr = kmap_atomic(src_page);
3005 dst_addr = kmap_atomic(dst_page);
3006
3007 flush_dcache_page(src_page);
3008 flush_dcache_page(dst_page);
3009
3010 if (memcmp(addr, dst_addr, cmp_len))
3011 ret = -EBADE;
3012
3013 kunmap_atomic(addr);
3014 kunmap_atomic(dst_addr);
3015
3016 if (ret)
3017 break;
3018
3019 len -= cmp_len;
3020 i++;
3021 }
3022
3023 return ret;
3024 }
3025
3026 static int extent_same_check_offsets(struct inode *inode, u64 off, u64 *plen,
3027 u64 olen)
3028 {
3029 u64 len = *plen;
3030 u64 bs = BTRFS_I(inode)->root->fs_info->sb->s_blocksize;
3031
3032 if (off + olen > inode->i_size || off + olen < off)
3033 return -EINVAL;
3034
3035 /* if we extend to eof, continue to block boundary */
3036 if (off + len == inode->i_size)
3037 *plen = len = ALIGN(inode->i_size, bs) - off;
3038
3039 /* Check that we are block aligned - btrfs_clone() requires this */
3040 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs))
3041 return -EINVAL;
3042
3043 return 0;
3044 }
3045
3046 static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
3047 struct inode *dst, u64 dst_loff)
3048 {
3049 int ret;
3050 u64 len = olen;
3051 struct cmp_pages cmp;
3052 int same_inode = 0;
3053 u64 same_lock_start = 0;
3054 u64 same_lock_len = 0;
3055
3056 if (src == dst)
3057 same_inode = 1;
3058
3059 if (len == 0)
3060 return 0;
3061
3062 if (same_inode) {
3063 inode_lock(src);
3064
3065 ret = extent_same_check_offsets(src, loff, &len, olen);
3066 if (ret)
3067 goto out_unlock;
3068
3069 /*
3070 * Single inode case wants the same checks, except we
3071 * don't want our length pushed out past i_size as
3072 * comparing that data range makes no sense.
3073 *
3074 * extent_same_check_offsets() will do this for an
3075 * unaligned length at i_size, so catch it here and
3076 * reject the request.
3077 *
3078 * This effectively means we require aligned extents
3079 * for the single-inode case, whereas the other cases
3080 * allow an unaligned length so long as it ends at
3081 * i_size.
3082 */
3083 if (len != olen) {
3084 ret = -EINVAL;
3085 goto out_unlock;
3086 }
3087
3088 /* Check for overlapping ranges */
3089 if (dst_loff + len > loff && dst_loff < loff + len) {
3090 ret = -EINVAL;
3091 goto out_unlock;
3092 }
3093
3094 same_lock_start = min_t(u64, loff, dst_loff);
3095 same_lock_len = max_t(u64, loff, dst_loff) + len - same_lock_start;
3096 } else {
3097 btrfs_double_inode_lock(src, dst);
3098
3099 ret = extent_same_check_offsets(src, loff, &len, olen);
3100 if (ret)
3101 goto out_unlock;
3102
3103 ret = extent_same_check_offsets(dst, dst_loff, &len, olen);
3104 if (ret)
3105 goto out_unlock;
3106 }
3107
3108 /* don't make the dst file partly checksummed */
3109 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3110 (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) {
3111 ret = -EINVAL;
3112 goto out_unlock;
3113 }
3114
3115 again:
3116 ret = btrfs_cmp_data_prepare(src, loff, dst, dst_loff, olen, &cmp);
3117 if (ret)
3118 goto out_unlock;
3119
3120 if (same_inode)
3121 ret = lock_extent_range(src, same_lock_start, same_lock_len,
3122 false);
3123 else
3124 ret = btrfs_double_extent_lock(src, loff, dst, dst_loff, len,
3125 false);
3126 /*
3127 * If one of the inodes has dirty pages in the respective range or
3128 * ordered extents, we need to flush dellaloc and wait for all ordered
3129 * extents in the range. We must unlock the pages and the ranges in the
3130 * io trees to avoid deadlocks when flushing delalloc (requires locking
3131 * pages) and when waiting for ordered extents to complete (they require
3132 * range locking).
3133 */
3134 if (ret == -EAGAIN) {
3135 /*
3136 * Ranges in the io trees already unlocked. Now unlock all
3137 * pages before waiting for all IO to complete.
3138 */
3139 btrfs_cmp_data_free(&cmp);
3140 if (same_inode) {
3141 btrfs_wait_ordered_range(src, same_lock_start,
3142 same_lock_len);
3143 } else {
3144 btrfs_wait_ordered_range(src, loff, len);
3145 btrfs_wait_ordered_range(dst, dst_loff, len);
3146 }
3147 goto again;
3148 }
3149 ASSERT(ret == 0);
3150 if (WARN_ON(ret)) {
3151 /* ranges in the io trees already unlocked */
3152 btrfs_cmp_data_free(&cmp);
3153 return ret;
3154 }
3155
3156 /* pass original length for comparison so we stay within i_size */
3157 ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen, &cmp);
3158 if (ret == 0)
3159 ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
3160
3161 if (same_inode)
3162 unlock_extent(&BTRFS_I(src)->io_tree, same_lock_start,
3163 same_lock_start + same_lock_len - 1);
3164 else
3165 btrfs_double_extent_unlock(src, loff, dst, dst_loff, len);
3166
3167 btrfs_cmp_data_free(&cmp);
3168 out_unlock:
3169 if (same_inode)
3170 inode_unlock(src);
3171 else
3172 btrfs_double_inode_unlock(src, dst);
3173
3174 return ret;
3175 }
3176
3177 #define BTRFS_MAX_DEDUPE_LEN SZ_16M
3178
3179 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3180 struct file *dst_file, u64 dst_loff)
3181 {
3182 struct inode *src = file_inode(src_file);
3183 struct inode *dst = file_inode(dst_file);
3184 u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
3185 ssize_t res;
3186
3187 if (olen > BTRFS_MAX_DEDUPE_LEN)
3188 olen = BTRFS_MAX_DEDUPE_LEN;
3189
3190 if (WARN_ON_ONCE(bs < PAGE_CACHE_SIZE)) {
3191 /*
3192 * Btrfs does not support blocksize < page_size. As a
3193 * result, btrfs_cmp_data() won't correctly handle
3194 * this situation without an update.
3195 */
3196 return -EINVAL;
3197 }
3198
3199 res = btrfs_extent_same(src, loff, olen, dst, dst_loff);
3200 if (res)
3201 return res;
3202 return olen;
3203 }
3204
3205 static int clone_finish_inode_update(struct btrfs_trans_handle *trans,
3206 struct inode *inode,
3207 u64 endoff,
3208 const u64 destoff,
3209 const u64 olen,
3210 int no_time_update)
3211 {
3212 struct btrfs_root *root = BTRFS_I(inode)->root;
3213 int ret;
3214
3215 inode_inc_iversion(inode);
3216 if (!no_time_update)
3217 inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
3218 /*
3219 * We round up to the block size at eof when determining which
3220 * extents to clone above, but shouldn't round up the file size.
3221 */
3222 if (endoff > destoff + olen)
3223 endoff = destoff + olen;
3224 if (endoff > inode->i_size)
3225 btrfs_i_size_write(inode, endoff);
3226
3227 ret = btrfs_update_inode(trans, root, inode);
3228 if (ret) {
3229 btrfs_abort_transaction(trans, root, ret);
3230 btrfs_end_transaction(trans, root);
3231 goto out;
3232 }
3233 ret = btrfs_end_transaction(trans, root);
3234 out:
3235 return ret;
3236 }
3237
3238 static void clone_update_extent_map(struct inode *inode,
3239 const struct btrfs_trans_handle *trans,
3240 const struct btrfs_path *path,
3241 const u64 hole_offset,
3242 const u64 hole_len)
3243 {
3244 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
3245 struct extent_map *em;
3246 int ret;
3247
3248 em = alloc_extent_map();
3249 if (!em) {
3250 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3251 &BTRFS_I(inode)->runtime_flags);
3252 return;
3253 }
3254
3255 if (path) {
3256 struct btrfs_file_extent_item *fi;
3257
3258 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
3259 struct btrfs_file_extent_item);
3260 btrfs_extent_item_to_extent_map(inode, path, fi, false, em);
3261 em->generation = -1;
3262 if (btrfs_file_extent_type(path->nodes[0], fi) ==
3263 BTRFS_FILE_EXTENT_INLINE)
3264 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3265 &BTRFS_I(inode)->runtime_flags);
3266 } else {
3267 em->start = hole_offset;
3268 em->len = hole_len;
3269 em->ram_bytes = em->len;
3270 em->orig_start = hole_offset;
3271 em->block_start = EXTENT_MAP_HOLE;
3272 em->block_len = 0;
3273 em->orig_block_len = 0;
3274 em->compress_type = BTRFS_COMPRESS_NONE;
3275 em->generation = trans->transid;
3276 }
3277
3278 while (1) {
3279 write_lock(&em_tree->lock);
3280 ret = add_extent_mapping(em_tree, em, 1);
3281 write_unlock(&em_tree->lock);
3282 if (ret != -EEXIST) {
3283 free_extent_map(em);
3284 break;
3285 }
3286 btrfs_drop_extent_cache(inode, em->start,
3287 em->start + em->len - 1, 0);
3288 }
3289
3290 if (ret)
3291 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
3292 &BTRFS_I(inode)->runtime_flags);
3293 }
3294
3295 /*
3296 * Make sure we do not end up inserting an inline extent into a file that has
3297 * already other (non-inline) extents. If a file has an inline extent it can
3298 * not have any other extents and the (single) inline extent must start at the
3299 * file offset 0. Failing to respect these rules will lead to file corruption,
3300 * resulting in EIO errors on read/write operations, hitting BUG_ON's in mm, etc
3301 *
3302 * We can have extents that have been already written to disk or we can have
3303 * dirty ranges still in delalloc, in which case the extent maps and items are
3304 * created only when we run delalloc, and the delalloc ranges might fall outside
3305 * the range we are currently locking in the inode's io tree. So we check the
3306 * inode's i_size because of that (i_size updates are done while holding the
3307 * i_mutex, which we are holding here).
3308 * We also check to see if the inode has a size not greater than "datal" but has
3309 * extents beyond it, due to an fallocate with FALLOC_FL_KEEP_SIZE (and we are
3310 * protected against such concurrent fallocate calls by the i_mutex).
3311 *
3312 * If the file has no extents but a size greater than datal, do not allow the
3313 * copy because we would need turn the inline extent into a non-inline one (even
3314 * with NO_HOLES enabled). If we find our destination inode only has one inline
3315 * extent, just overwrite it with the source inline extent if its size is less
3316 * than the source extent's size, or we could copy the source inline extent's
3317 * data into the destination inode's inline extent if the later is greater then
3318 * the former.
3319 */
3320 static int clone_copy_inline_extent(struct inode *src,
3321 struct inode *dst,
3322 struct btrfs_trans_handle *trans,
3323 struct btrfs_path *path,
3324 struct btrfs_key *new_key,
3325 const u64 drop_start,
3326 const u64 datal,
3327 const u64 skip,
3328 const u64 size,
3329 char *inline_data)
3330 {
3331 struct btrfs_root *root = BTRFS_I(dst)->root;
3332 const u64 aligned_end = ALIGN(new_key->offset + datal,
3333 root->sectorsize);
3334 int ret;
3335 struct btrfs_key key;
3336
3337 if (new_key->offset > 0)
3338 return -EOPNOTSUPP;
3339
3340 key.objectid = btrfs_ino(dst);
3341 key.type = BTRFS_EXTENT_DATA_KEY;
3342 key.offset = 0;
3343 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3344 if (ret < 0) {
3345 return ret;
3346 } else if (ret > 0) {
3347 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3348 ret = btrfs_next_leaf(root, path);
3349 if (ret < 0)
3350 return ret;
3351 else if (ret > 0)
3352 goto copy_inline_extent;
3353 }
3354 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
3355 if (key.objectid == btrfs_ino(dst) &&
3356 key.type == BTRFS_EXTENT_DATA_KEY) {
3357 ASSERT(key.offset > 0);
3358 return -EOPNOTSUPP;
3359 }
3360 } else if (i_size_read(dst) <= datal) {
3361 struct btrfs_file_extent_item *ei;
3362 u64 ext_len;
3363
3364 /*
3365 * If the file size is <= datal, make sure there are no other
3366 * extents following (can happen do to an fallocate call with
3367 * the flag FALLOC_FL_KEEP_SIZE).
3368 */
3369 ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
3370 struct btrfs_file_extent_item);
3371 /*
3372 * If it's an inline extent, it can not have other extents
3373 * following it.
3374 */
3375 if (btrfs_file_extent_type(path->nodes[0], ei) ==
3376 BTRFS_FILE_EXTENT_INLINE)
3377 goto copy_inline_extent;
3378
3379 ext_len = btrfs_file_extent_num_bytes(path->nodes[0], ei);
3380 if (ext_len > aligned_end)
3381 return -EOPNOTSUPP;
3382
3383 ret = btrfs_next_item(root, path);
3384 if (ret < 0) {
3385 return ret;
3386 } else if (ret == 0) {
3387 btrfs_item_key_to_cpu(path->nodes[0], &key,
3388 path->slots[0]);
3389 if (key.objectid == btrfs_ino(dst) &&
3390 key.type == BTRFS_EXTENT_DATA_KEY)
3391 return -EOPNOTSUPP;
3392 }
3393 }
3394
3395 copy_inline_extent:
3396 /*
3397 * We have no extent items, or we have an extent at offset 0 which may
3398 * or may not be inlined. All these cases are dealt the same way.
3399 */
3400 if (i_size_read(dst) > datal) {
3401 /*
3402 * If the destination inode has an inline extent...
3403 * This would require copying the data from the source inline
3404 * extent into the beginning of the destination's inline extent.
3405 * But this is really complex, both extents can be compressed
3406 * or just one of them, which would require decompressing and
3407 * re-compressing data (which could increase the new compressed
3408 * size, not allowing the compressed data to fit anymore in an
3409 * inline extent).
3410 * So just don't support this case for now (it should be rare,
3411 * we are not really saving space when cloning inline extents).
3412 */
3413 return -EOPNOTSUPP;
3414 }
3415
3416 btrfs_release_path(path);
3417 ret = btrfs_drop_extents(trans, root, dst, drop_start, aligned_end, 1);
3418 if (ret)
3419 return ret;
3420 ret = btrfs_insert_empty_item(trans, root, path, new_key, size);
3421 if (ret)
3422 return ret;
3423
3424 if (skip) {
3425 const u32 start = btrfs_file_extent_calc_inline_size(0);
3426
3427 memmove(inline_data + start, inline_data + start + skip, datal);
3428 }
3429
3430 write_extent_buffer(path->nodes[0], inline_data,
3431 btrfs_item_ptr_offset(path->nodes[0],
3432 path->slots[0]),
3433 size);
3434 inode_add_bytes(dst, datal);
3435
3436 return 0;
3437 }
3438
3439 /**
3440 * btrfs_clone() - clone a range from inode file to another
3441 *
3442 * @src: Inode to clone from
3443 * @inode: Inode to clone to
3444 * @off: Offset within source to start clone from
3445 * @olen: Original length, passed by user, of range to clone
3446 * @olen_aligned: Block-aligned value of olen
3447 * @destoff: Offset within @inode to start clone
3448 * @no_time_update: Whether to update mtime/ctime on the target inode
3449 */
3450 static int btrfs_clone(struct inode *src, struct inode *inode,
3451 const u64 off, const u64 olen, const u64 olen_aligned,
3452 const u64 destoff, int no_time_update)
3453 {
3454 struct btrfs_root *root = BTRFS_I(inode)->root;
3455 struct btrfs_path *path = NULL;
3456 struct extent_buffer *leaf;
3457 struct btrfs_trans_handle *trans;
3458 char *buf = NULL;
3459 struct btrfs_key key;
3460 u32 nritems;
3461 int slot;
3462 int ret;
3463 const u64 len = olen_aligned;
3464 u64 last_dest_end = destoff;
3465
3466 ret = -ENOMEM;
3467 buf = vmalloc(root->nodesize);
3468 if (!buf)
3469 return ret;
3470
3471 path = btrfs_alloc_path();
3472 if (!path) {
3473 vfree(buf);
3474 return ret;
3475 }
3476
3477 path->reada = READA_FORWARD;
3478 /* clone data */
3479 key.objectid = btrfs_ino(src);
3480 key.type = BTRFS_EXTENT_DATA_KEY;
3481 key.offset = off;
3482
3483 while (1) {
3484 u64 next_key_min_offset = key.offset + 1;
3485
3486 /*
3487 * note the key will change type as we walk through the
3488 * tree.
3489 */
3490 path->leave_spinning = 1;
3491 ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
3492 0, 0);
3493 if (ret < 0)
3494 goto out;
3495 /*
3496 * First search, if no extent item that starts at offset off was
3497 * found but the previous item is an extent item, it's possible
3498 * it might overlap our target range, therefore process it.
3499 */
3500 if (key.offset == off && ret > 0 && path->slots[0] > 0) {
3501 btrfs_item_key_to_cpu(path->nodes[0], &key,
3502 path->slots[0] - 1);
3503 if (key.type == BTRFS_EXTENT_DATA_KEY)
3504 path->slots[0]--;
3505 }
3506
3507 nritems = btrfs_header_nritems(path->nodes[0]);
3508 process_slot:
3509 if (path->slots[0] >= nritems) {
3510 ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
3511 if (ret < 0)
3512 goto out;
3513 if (ret > 0)
3514 break;
3515 nritems = btrfs_header_nritems(path->nodes[0]);
3516 }
3517 leaf = path->nodes[0];
3518 slot = path->slots[0];
3519
3520 btrfs_item_key_to_cpu(leaf, &key, slot);
3521 if (key.type > BTRFS_EXTENT_DATA_KEY ||
3522 key.objectid != btrfs_ino(src))
3523 break;
3524
3525 if (key.type == BTRFS_EXTENT_DATA_KEY) {
3526 struct btrfs_file_extent_item *extent;
3527 int type;
3528 u32 size;
3529 struct btrfs_key new_key;
3530 u64 disko = 0, diskl = 0;
3531 u64 datao = 0, datal = 0;
3532 u8 comp;
3533 u64 drop_start;
3534
3535 extent = btrfs_item_ptr(leaf, slot,
3536 struct btrfs_file_extent_item);
3537 comp = btrfs_file_extent_compression(leaf, extent);
3538 type = btrfs_file_extent_type(leaf, extent);
3539 if (type == BTRFS_FILE_EXTENT_REG ||
3540 type == BTRFS_FILE_EXTENT_PREALLOC) {
3541 disko = btrfs_file_extent_disk_bytenr(leaf,
3542 extent);
3543 diskl = btrfs_file_extent_disk_num_bytes(leaf,
3544 extent);
3545 datao = btrfs_file_extent_offset(leaf, extent);
3546 datal = btrfs_file_extent_num_bytes(leaf,
3547 extent);
3548 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3549 /* take upper bound, may be compressed */
3550 datal = btrfs_file_extent_ram_bytes(leaf,
3551 extent);
3552 }
3553
3554 /*
3555 * The first search might have left us at an extent
3556 * item that ends before our target range's start, can
3557 * happen if we have holes and NO_HOLES feature enabled.
3558 */
3559 if (key.offset + datal <= off) {
3560 path->slots[0]++;
3561 goto process_slot;
3562 } else if (key.offset >= off + len) {
3563 break;
3564 }
3565 next_key_min_offset = key.offset + datal;
3566 size = btrfs_item_size_nr(leaf, slot);
3567 read_extent_buffer(leaf, buf,
3568 btrfs_item_ptr_offset(leaf, slot),
3569 size);
3570
3571 btrfs_release_path(path);
3572 path->leave_spinning = 0;
3573
3574 memcpy(&new_key, &key, sizeof(new_key));
3575 new_key.objectid = btrfs_ino(inode);
3576 if (off <= key.offset)
3577 new_key.offset = key.offset + destoff - off;
3578 else
3579 new_key.offset = destoff;
3580
3581 /*
3582 * Deal with a hole that doesn't have an extent item
3583 * that represents it (NO_HOLES feature enabled).
3584 * This hole is either in the middle of the cloning
3585 * range or at the beginning (fully overlaps it or
3586 * partially overlaps it).
3587 */
3588 if (new_key.offset != last_dest_end)
3589 drop_start = last_dest_end;
3590 else
3591 drop_start = new_key.offset;
3592
3593 /*
3594 * 1 - adjusting old extent (we may have to split it)
3595 * 1 - add new extent
3596 * 1 - inode update
3597 */
3598 trans = btrfs_start_transaction(root, 3);
3599 if (IS_ERR(trans)) {
3600 ret = PTR_ERR(trans);
3601 goto out;
3602 }
3603
3604 if (type == BTRFS_FILE_EXTENT_REG ||
3605 type == BTRFS_FILE_EXTENT_PREALLOC) {
3606 /*
3607 * a | --- range to clone ---| b
3608 * | ------------- extent ------------- |
3609 */
3610
3611 /* subtract range b */
3612 if (key.offset + datal > off + len)
3613 datal = off + len - key.offset;
3614
3615 /* subtract range a */
3616 if (off > key.offset) {
3617 datao += off - key.offset;
3618 datal -= off - key.offset;
3619 }
3620
3621 ret = btrfs_drop_extents(trans, root, inode,
3622 drop_start,
3623 new_key.offset + datal,
3624 1);
3625 if (ret) {
3626 if (ret != -EOPNOTSUPP)
3627 btrfs_abort_transaction(trans,
3628 root, ret);
3629 btrfs_end_transaction(trans, root);
3630 goto out;
3631 }
3632
3633 ret = btrfs_insert_empty_item(trans, root, path,
3634 &new_key, size);
3635 if (ret) {
3636 btrfs_abort_transaction(trans, root,
3637 ret);
3638 btrfs_end_transaction(trans, root);
3639 goto out;
3640 }
3641
3642 leaf = path->nodes[0];
3643 slot = path->slots[0];
3644 write_extent_buffer(leaf, buf,
3645 btrfs_item_ptr_offset(leaf, slot),
3646 size);
3647
3648 extent = btrfs_item_ptr(leaf, slot,
3649 struct btrfs_file_extent_item);
3650
3651 /* disko == 0 means it's a hole */
3652 if (!disko)
3653 datao = 0;
3654
3655 btrfs_set_file_extent_offset(leaf, extent,
3656 datao);
3657 btrfs_set_file_extent_num_bytes(leaf, extent,
3658 datal);
3659
3660 if (disko) {
3661 inode_add_bytes(inode, datal);
3662 ret = btrfs_inc_extent_ref(trans, root,
3663 disko, diskl, 0,
3664 root->root_key.objectid,
3665 btrfs_ino(inode),
3666 new_key.offset - datao);
3667 if (ret) {
3668 btrfs_abort_transaction(trans,
3669 root,
3670 ret);
3671 btrfs_end_transaction(trans,
3672 root);
3673 goto out;
3674
3675 }
3676 }
3677 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
3678 u64 skip = 0;
3679 u64 trim = 0;
3680
3681 if (off > key.offset) {
3682 skip = off - key.offset;
3683 new_key.offset += skip;
3684 }
3685
3686 if (key.offset + datal > off + len)
3687 trim = key.offset + datal - (off + len);
3688
3689 if (comp && (skip || trim)) {
3690 ret = -EINVAL;
3691 btrfs_end_transaction(trans, root);
3692 goto out;
3693 }
3694 size -= skip + trim;
3695 datal -= skip + trim;
3696
3697 ret = clone_copy_inline_extent(src, inode,
3698 trans, path,
3699 &new_key,
3700 drop_start,
3701 datal,
3702 skip, size, buf);
3703 if (ret) {
3704 if (ret != -EOPNOTSUPP)
3705 btrfs_abort_transaction(trans,
3706 root,
3707 ret);
3708 btrfs_end_transaction(trans, root);
3709 goto out;
3710 }
3711 leaf = path->nodes[0];
3712 slot = path->slots[0];
3713 }
3714
3715 /* If we have an implicit hole (NO_HOLES feature). */
3716 if (drop_start < new_key.offset)
3717 clone_update_extent_map(inode, trans,
3718 NULL, drop_start,
3719 new_key.offset - drop_start);
3720
3721 clone_update_extent_map(inode, trans, path, 0, 0);
3722
3723 btrfs_mark_buffer_dirty(leaf);
3724 btrfs_release_path(path);
3725
3726 last_dest_end = ALIGN(new_key.offset + datal,
3727 root->sectorsize);
3728 ret = clone_finish_inode_update(trans, inode,
3729 last_dest_end,
3730 destoff, olen,
3731 no_time_update);
3732 if (ret)
3733 goto out;
3734 if (new_key.offset + datal >= destoff + len)
3735 break;
3736 }
3737 btrfs_release_path(path);
3738 key.offset = next_key_min_offset;
3739 }
3740 ret = 0;
3741
3742 if (last_dest_end < destoff + len) {
3743 /*
3744 * We have an implicit hole (NO_HOLES feature is enabled) that
3745 * fully or partially overlaps our cloning range at its end.
3746 */
3747 btrfs_release_path(path);
3748
3749 /*
3750 * 1 - remove extent(s)
3751 * 1 - inode update
3752 */
3753 trans = btrfs_start_transaction(root, 2);
3754 if (IS_ERR(trans)) {
3755 ret = PTR_ERR(trans);
3756 goto out;
3757 }
3758 ret = btrfs_drop_extents(trans, root, inode,
3759 last_dest_end, destoff + len, 1);
3760 if (ret) {
3761 if (ret != -EOPNOTSUPP)
3762 btrfs_abort_transaction(trans, root, ret);
3763 btrfs_end_transaction(trans, root);
3764 goto out;
3765 }
3766 clone_update_extent_map(inode, trans, NULL, last_dest_end,
3767 destoff + len - last_dest_end);
3768 ret = clone_finish_inode_update(trans, inode, destoff + len,
3769 destoff, olen, no_time_update);
3770 }
3771
3772 out:
3773 btrfs_free_path(path);
3774 vfree(buf);
3775 return ret;
3776 }
3777
3778 static noinline int btrfs_clone_files(struct file *file, struct file *file_src,
3779 u64 off, u64 olen, u64 destoff)
3780 {
3781 struct inode *inode = file_inode(file);
3782 struct inode *src = file_inode(file_src);
3783 struct btrfs_root *root = BTRFS_I(inode)->root;
3784 int ret;
3785 u64 len = olen;
3786 u64 bs = root->fs_info->sb->s_blocksize;
3787 int same_inode = src == inode;
3788
3789 /*
3790 * TODO:
3791 * - split compressed inline extents. annoying: we need to
3792 * decompress into destination's address_space (the file offset
3793 * may change, so source mapping won't do), then recompress (or
3794 * otherwise reinsert) a subrange.
3795 *
3796 * - split destination inode's inline extents. The inline extents can
3797 * be either compressed or non-compressed.
3798 */
3799
3800 if (btrfs_root_readonly(root))
3801 return -EROFS;
3802
3803 if (file_src->f_path.mnt != file->f_path.mnt ||
3804 src->i_sb != inode->i_sb)
3805 return -EXDEV;
3806
3807 /* don't make the dst file partly checksummed */
3808 if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) !=
3809 (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
3810 return -EINVAL;
3811
3812 if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
3813 return -EISDIR;
3814
3815 if (!same_inode) {
3816 btrfs_double_inode_lock(src, inode);
3817 } else {
3818 inode_lock(src);
3819 }
3820
3821 /* determine range to clone */
3822 ret = -EINVAL;
3823 if (off + len > src->i_size || off + len < off)
3824 goto out_unlock;
3825 if (len == 0)
3826 olen = len = src->i_size - off;
3827 /* if we extend to eof, continue to block boundary */
3828 if (off + len == src->i_size)
3829 len = ALIGN(src->i_size, bs) - off;
3830
3831 if (len == 0) {
3832 ret = 0;
3833 goto out_unlock;
3834 }
3835
3836 /* verify the end result is block aligned */
3837 if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) ||
3838 !IS_ALIGNED(destoff, bs))
3839 goto out_unlock;
3840
3841 /* verify if ranges are overlapped within the same file */
3842 if (same_inode) {
3843 if (destoff + len > off && destoff < off + len)
3844 goto out_unlock;
3845 }
3846
3847 if (destoff > inode->i_size) {
3848 ret = btrfs_cont_expand(inode, inode->i_size, destoff);
3849 if (ret)
3850 goto out_unlock;
3851 }
3852
3853 /*
3854 * Lock the target range too. Right after we replace the file extent
3855 * items in the fs tree (which now point to the cloned data), we might
3856 * have a worker replace them with extent items relative to a write
3857 * operation that was issued before this clone operation (i.e. confront
3858 * with inode.c:btrfs_finish_ordered_io).
3859 */
3860 if (same_inode) {
3861 u64 lock_start = min_t(u64, off, destoff);
3862 u64 lock_len = max_t(u64, off, destoff) + len - lock_start;
3863
3864 ret = lock_extent_range(src, lock_start, lock_len, true);
3865 } else {
3866 ret = btrfs_double_extent_lock(src, off, inode, destoff, len,
3867 true);
3868 }
3869 ASSERT(ret == 0);
3870 if (WARN_ON(ret)) {
3871 /* ranges in the io trees already unlocked */
3872 goto out_unlock;
3873 }
3874
3875 ret = btrfs_clone(src, inode, off, olen, len, destoff, 0);
3876
3877 if (same_inode) {
3878 u64 lock_start = min_t(u64, off, destoff);
3879 u64 lock_end = max_t(u64, off, destoff) + len - 1;
3880
3881 unlock_extent(&BTRFS_I(src)->io_tree, lock_start, lock_end);
3882 } else {
3883 btrfs_double_extent_unlock(src, off, inode, destoff, len);
3884 }
3885 /*
3886 * Truncate page cache pages so that future reads will see the cloned
3887 * data immediately and not the previous data.
3888 */
3889 truncate_inode_pages_range(&inode->i_data,
3890 round_down(destoff, PAGE_CACHE_SIZE),
3891 round_up(destoff + len, PAGE_CACHE_SIZE) - 1);
3892 out_unlock:
3893 if (!same_inode)
3894 btrfs_double_inode_unlock(src, inode);
3895 else
3896 inode_unlock(src);
3897 return ret;
3898 }
3899
3900 ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in,
3901 struct file *file_out, loff_t pos_out,
3902 size_t len, unsigned int flags)
3903 {
3904 ssize_t ret;
3905
3906 ret = btrfs_clone_files(file_out, file_in, pos_in, len, pos_out);
3907 if (ret == 0)
3908 ret = len;
3909 return ret;
3910 }
3911
3912 int btrfs_clone_file_range(struct file *src_file, loff_t off,
3913 struct file *dst_file, loff_t destoff, u64 len)
3914 {
3915 return btrfs_clone_files(dst_file, src_file, off, len, destoff);
3916 }
3917
3918 /*
3919 * there are many ways the trans_start and trans_end ioctls can lead
3920 * to deadlocks. They should only be used by applications that
3921 * basically own the machine, and have a very in depth understanding
3922 * of all the possible deadlocks and enospc problems.
3923 */
3924 static long btrfs_ioctl_trans_start(struct file *file)
3925 {
3926 struct inode *inode = file_inode(file);
3927 struct btrfs_root *root = BTRFS_I(inode)->root;
3928 struct btrfs_trans_handle *trans;
3929 int ret;
3930
3931 ret = -EPERM;
3932 if (!capable(CAP_SYS_ADMIN))
3933 goto out;
3934
3935 ret = -EINPROGRESS;
3936 if (file->private_data)
3937 goto out;
3938
3939 ret = -EROFS;
3940 if (btrfs_root_readonly(root))
3941 goto out;
3942
3943 ret = mnt_want_write_file(file);
3944 if (ret)
3945 goto out;
3946
3947 atomic_inc(&root->fs_info->open_ioctl_trans);
3948
3949 ret = -ENOMEM;
3950 trans = btrfs_start_ioctl_transaction(root);
3951 if (IS_ERR(trans))
3952 goto out_drop;
3953
3954 file->private_data = trans;
3955 return 0;
3956
3957 out_drop:
3958 atomic_dec(&root->fs_info->open_ioctl_trans);
3959 mnt_drop_write_file(file);
3960 out:
3961 return ret;
3962 }
3963
3964 static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3965 {
3966 struct inode *inode = file_inode(file);
3967 struct btrfs_root *root = BTRFS_I(inode)->root;
3968 struct btrfs_root *new_root;
3969 struct btrfs_dir_item *di;
3970 struct btrfs_trans_handle *trans;
3971 struct btrfs_path *path;
3972 struct btrfs_key location;
3973 struct btrfs_disk_key disk_key;
3974 u64 objectid = 0;
3975 u64 dir_id;
3976 int ret;
3977
3978 if (!capable(CAP_SYS_ADMIN))
3979 return -EPERM;
3980
3981 ret = mnt_want_write_file(file);
3982 if (ret)
3983 return ret;
3984
3985 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3986 ret = -EFAULT;
3987 goto out;
3988 }
3989
3990 if (!objectid)
3991 objectid = BTRFS_FS_TREE_OBJECTID;
3992
3993 location.objectid = objectid;
3994 location.type = BTRFS_ROOT_ITEM_KEY;
3995 location.offset = (u64)-1;
3996
3997 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
3998 if (IS_ERR(new_root)) {
3999 ret = PTR_ERR(new_root);
4000 goto out;
4001 }
4002
4003 path = btrfs_alloc_path();
4004 if (!path) {
4005 ret = -ENOMEM;
4006 goto out;
4007 }
4008 path->leave_spinning = 1;
4009
4010 trans = btrfs_start_transaction(root, 1);
4011 if (IS_ERR(trans)) {
4012 btrfs_free_path(path);
4013 ret = PTR_ERR(trans);
4014 goto out;
4015 }
4016
4017 dir_id = btrfs_super_root_dir(root->fs_info->super_copy);
4018 di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path,
4019 dir_id, "default", 7, 1);
4020 if (IS_ERR_OR_NULL(di)) {
4021 btrfs_free_path(path);
4022 btrfs_end_transaction(trans, root);
4023 btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
4024 "item, this isn't going to work");
4025 ret = -ENOENT;
4026 goto out;
4027 }
4028
4029 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
4030 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
4031 btrfs_mark_buffer_dirty(path->nodes[0]);
4032 btrfs_free_path(path);
4033
4034 btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL);
4035 btrfs_end_transaction(trans, root);
4036 out:
4037 mnt_drop_write_file(file);
4038 return ret;
4039 }
4040
4041 void btrfs_get_block_group_info(struct list_head *groups_list,
4042 struct btrfs_ioctl_space_info *space)
4043 {
4044 struct btrfs_block_group_cache *block_group;
4045
4046 space->total_bytes = 0;
4047 space->used_bytes = 0;
4048 space->flags = 0;
4049 list_for_each_entry(block_group, groups_list, list) {
4050 space->flags = block_group->flags;
4051 space->total_bytes += block_group->key.offset;
4052 space->used_bytes +=
4053 btrfs_block_group_used(&block_group->item);
4054 }
4055 }
4056
4057 static long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg)
4058 {
4059 struct btrfs_ioctl_space_args space_args;
4060 struct btrfs_ioctl_space_info space;
4061 struct btrfs_ioctl_space_info *dest;
4062 struct btrfs_ioctl_space_info *dest_orig;
4063 struct btrfs_ioctl_space_info __user *user_dest;
4064 struct btrfs_space_info *info;
4065 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
4066 BTRFS_BLOCK_GROUP_SYSTEM,
4067 BTRFS_BLOCK_GROUP_METADATA,
4068 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
4069 int num_types = 4;
4070 int alloc_size;
4071 int ret = 0;
4072 u64 slot_count = 0;
4073 int i, c;
4074
4075 if (copy_from_user(&space_args,
4076 (struct btrfs_ioctl_space_args __user *)arg,
4077 sizeof(space_args)))
4078 return -EFAULT;
4079
4080 for (i = 0; i < num_types; i++) {
4081 struct btrfs_space_info *tmp;
4082
4083 info = NULL;
4084 rcu_read_lock();
4085 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
4086 list) {
4087 if (tmp->flags == types[i]) {
4088 info = tmp;
4089 break;
4090 }
4091 }
4092 rcu_read_unlock();
4093
4094 if (!info)
4095 continue;
4096
4097 down_read(&info->groups_sem);
4098 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4099 if (!list_empty(&info->block_groups[c]))
4100 slot_count++;
4101 }
4102 up_read(&info->groups_sem);
4103 }
4104
4105 /*
4106 * Global block reserve, exported as a space_info
4107 */
4108 slot_count++;
4109
4110 /* space_slots == 0 means they are asking for a count */
4111 if (space_args.space_slots == 0) {
4112 space_args.total_spaces = slot_count;
4113 goto out;
4114 }
4115
4116 slot_count = min_t(u64, space_args.space_slots, slot_count);
4117
4118 alloc_size = sizeof(*dest) * slot_count;
4119
4120 /* we generally have at most 6 or so space infos, one for each raid
4121 * level. So, a whole page should be more than enough for everyone
4122 */
4123 if (alloc_size > PAGE_CACHE_SIZE)
4124 return -ENOMEM;
4125
4126 space_args.total_spaces = 0;
4127 dest = kmalloc(alloc_size, GFP_KERNEL);
4128 if (!dest)
4129 return -ENOMEM;
4130 dest_orig = dest;
4131
4132 /* now we have a buffer to copy into */
4133 for (i = 0; i < num_types; i++) {
4134 struct btrfs_space_info *tmp;
4135
4136 if (!slot_count)
4137 break;
4138
4139 info = NULL;
4140 rcu_read_lock();
4141 list_for_each_entry_rcu(tmp, &root->fs_info->space_info,
4142 list) {
4143 if (tmp->flags == types[i]) {
4144 info = tmp;
4145 break;
4146 }
4147 }
4148 rcu_read_unlock();
4149
4150 if (!info)
4151 continue;
4152 down_read(&info->groups_sem);
4153 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
4154 if (!list_empty(&info->block_groups[c])) {
4155 btrfs_get_block_group_info(
4156 &info->block_groups[c], &space);
4157 memcpy(dest, &space, sizeof(space));
4158 dest++;
4159 space_args.total_spaces++;
4160 slot_count--;
4161 }
4162 if (!slot_count)
4163 break;
4164 }
4165 up_read(&info->groups_sem);
4166 }
4167
4168 /*
4169 * Add global block reserve
4170 */
4171 if (slot_count) {
4172 struct btrfs_block_rsv *block_rsv = &root->fs_info->global_block_rsv;
4173
4174 spin_lock(&block_rsv->lock);
4175 space.total_bytes = block_rsv->size;
4176 space.used_bytes = block_rsv->size - block_rsv->reserved;
4177 spin_unlock(&block_rsv->lock);
4178 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
4179 memcpy(dest, &space, sizeof(space));
4180 space_args.total_spaces++;
4181 }
4182
4183 user_dest = (struct btrfs_ioctl_space_info __user *)
4184 (arg + sizeof(struct btrfs_ioctl_space_args));
4185
4186 if (copy_to_user(user_dest, dest_orig, alloc_size))
4187 ret = -EFAULT;
4188
4189 kfree(dest_orig);
4190 out:
4191 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
4192 ret = -EFAULT;
4193
4194 return ret;
4195 }
4196
4197 /*
4198 * there are many ways the trans_start and trans_end ioctls can lead
4199 * to deadlocks. They should only be used by applications that
4200 * basically own the machine, and have a very in depth understanding
4201 * of all the possible deadlocks and enospc problems.
4202 */
4203 long btrfs_ioctl_trans_end(struct file *file)
4204 {
4205 struct inode *inode = file_inode(file);
4206 struct btrfs_root *root = BTRFS_I(inode)->root;
4207 struct btrfs_trans_handle *trans;
4208
4209 trans = file->private_data;
4210 if (!trans)
4211 return -EINVAL;
4212 file->private_data = NULL;
4213
4214 btrfs_end_transaction(trans, root);
4215
4216 atomic_dec(&root->fs_info->open_ioctl_trans);
4217
4218 mnt_drop_write_file(file);
4219 return 0;
4220 }
4221
4222 static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
4223 void __user *argp)
4224 {
4225 struct btrfs_trans_handle *trans;
4226 u64 transid;
4227 int ret;
4228
4229 trans = btrfs_attach_transaction_barrier(root);
4230 if (IS_ERR(trans)) {
4231 if (PTR_ERR(trans) != -ENOENT)
4232 return PTR_ERR(trans);
4233
4234 /* No running transaction, don't bother */
4235 transid = root->fs_info->last_trans_committed;
4236 goto out;
4237 }
4238 transid = trans->transid;
4239 ret = btrfs_commit_transaction_async(trans, root, 0);
4240 if (ret) {
4241 btrfs_end_transaction(trans, root);
4242 return ret;
4243 }
4244 out:
4245 if (argp)
4246 if (copy_to_user(argp, &transid, sizeof(transid)))
4247 return -EFAULT;
4248 return 0;
4249 }
4250
4251 static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root,
4252 void __user *argp)
4253 {
4254 u64 transid;
4255
4256 if (argp) {
4257 if (copy_from_user(&transid, argp, sizeof(transid)))
4258 return -EFAULT;
4259 } else {
4260 transid = 0; /* current trans */
4261 }
4262 return btrfs_wait_for_commit(root, transid);
4263 }
4264
4265 static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
4266 {
4267 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4268 struct btrfs_ioctl_scrub_args *sa;
4269 int ret;
4270
4271 if (!capable(CAP_SYS_ADMIN))
4272 return -EPERM;
4273
4274 sa = memdup_user(arg, sizeof(*sa));
4275 if (IS_ERR(sa))
4276 return PTR_ERR(sa);
4277
4278 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
4279 ret = mnt_want_write_file(file);
4280 if (ret)
4281 goto out;
4282 }
4283
4284 ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end,
4285 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
4286 0);
4287
4288 if (copy_to_user(arg, sa, sizeof(*sa)))
4289 ret = -EFAULT;
4290
4291 if (!(sa->flags & BTRFS_SCRUB_READONLY))
4292 mnt_drop_write_file(file);
4293 out:
4294 kfree(sa);
4295 return ret;
4296 }
4297
4298 static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg)
4299 {
4300 if (!capable(CAP_SYS_ADMIN))
4301 return -EPERM;
4302
4303 return btrfs_scrub_cancel(root->fs_info);
4304 }
4305
4306 static long btrfs_ioctl_scrub_progress(struct btrfs_root *root,
4307 void __user *arg)
4308 {
4309 struct btrfs_ioctl_scrub_args *sa;
4310 int ret;
4311
4312 if (!capable(CAP_SYS_ADMIN))
4313 return -EPERM;
4314
4315 sa = memdup_user(arg, sizeof(*sa));
4316 if (IS_ERR(sa))
4317 return PTR_ERR(sa);
4318
4319 ret = btrfs_scrub_progress(root, sa->devid, &sa->progress);
4320
4321 if (copy_to_user(arg, sa, sizeof(*sa)))
4322 ret = -EFAULT;
4323
4324 kfree(sa);
4325 return ret;
4326 }
4327
4328 static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,
4329 void __user *arg)
4330 {
4331 struct btrfs_ioctl_get_dev_stats *sa;
4332 int ret;
4333
4334 sa = memdup_user(arg, sizeof(*sa));
4335 if (IS_ERR(sa))
4336 return PTR_ERR(sa);
4337
4338 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
4339 kfree(sa);
4340 return -EPERM;
4341 }
4342
4343 ret = btrfs_get_dev_stats(root, sa);
4344
4345 if (copy_to_user(arg, sa, sizeof(*sa)))
4346 ret = -EFAULT;
4347
4348 kfree(sa);
4349 return ret;
4350 }
4351
4352 static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg)
4353 {
4354 struct btrfs_ioctl_dev_replace_args *p;
4355 int ret;
4356
4357 if (!capable(CAP_SYS_ADMIN))
4358 return -EPERM;
4359
4360 p = memdup_user(arg, sizeof(*p));
4361 if (IS_ERR(p))
4362 return PTR_ERR(p);
4363
4364 switch (p->cmd) {
4365 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
4366 if (root->fs_info->sb->s_flags & MS_RDONLY) {
4367 ret = -EROFS;
4368 goto out;
4369 }
4370 if (atomic_xchg(
4371 &root->fs_info->mutually_exclusive_operation_running,
4372 1)) {
4373 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4374 } else {
4375 ret = btrfs_dev_replace_start(root, p);
4376 atomic_set(
4377 &root->fs_info->mutually_exclusive_operation_running,
4378 0);
4379 }
4380 break;
4381 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
4382 btrfs_dev_replace_status(root->fs_info, p);
4383 ret = 0;
4384 break;
4385 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
4386 ret = btrfs_dev_replace_cancel(root->fs_info, p);
4387 break;
4388 default:
4389 ret = -EINVAL;
4390 break;
4391 }
4392
4393 if (copy_to_user(arg, p, sizeof(*p)))
4394 ret = -EFAULT;
4395 out:
4396 kfree(p);
4397 return ret;
4398 }
4399
4400 static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
4401 {
4402 int ret = 0;
4403 int i;
4404 u64 rel_ptr;
4405 int size;
4406 struct btrfs_ioctl_ino_path_args *ipa = NULL;
4407 struct inode_fs_paths *ipath = NULL;
4408 struct btrfs_path *path;
4409
4410 if (!capable(CAP_DAC_READ_SEARCH))
4411 return -EPERM;
4412
4413 path = btrfs_alloc_path();
4414 if (!path) {
4415 ret = -ENOMEM;
4416 goto out;
4417 }
4418
4419 ipa = memdup_user(arg, sizeof(*ipa));
4420 if (IS_ERR(ipa)) {
4421 ret = PTR_ERR(ipa);
4422 ipa = NULL;
4423 goto out;
4424 }
4425
4426 size = min_t(u32, ipa->size, 4096);
4427 ipath = init_ipath(size, root, path);
4428 if (IS_ERR(ipath)) {
4429 ret = PTR_ERR(ipath);
4430 ipath = NULL;
4431 goto out;
4432 }
4433
4434 ret = paths_from_inode(ipa->inum, ipath);
4435 if (ret < 0)
4436 goto out;
4437
4438 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
4439 rel_ptr = ipath->fspath->val[i] -
4440 (u64)(unsigned long)ipath->fspath->val;
4441 ipath->fspath->val[i] = rel_ptr;
4442 }
4443
4444 ret = copy_to_user((void *)(unsigned long)ipa->fspath,
4445 (void *)(unsigned long)ipath->fspath, size);
4446 if (ret) {
4447 ret = -EFAULT;
4448 goto out;
4449 }
4450
4451 out:
4452 btrfs_free_path(path);
4453 free_ipath(ipath);
4454 kfree(ipa);
4455
4456 return ret;
4457 }
4458
4459 static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
4460 {
4461 struct btrfs_data_container *inodes = ctx;
4462 const size_t c = 3 * sizeof(u64);
4463
4464 if (inodes->bytes_left >= c) {
4465 inodes->bytes_left -= c;
4466 inodes->val[inodes->elem_cnt] = inum;
4467 inodes->val[inodes->elem_cnt + 1] = offset;
4468 inodes->val[inodes->elem_cnt + 2] = root;
4469 inodes->elem_cnt += 3;
4470 } else {
4471 inodes->bytes_missing += c - inodes->bytes_left;
4472 inodes->bytes_left = 0;
4473 inodes->elem_missed += 3;
4474 }
4475
4476 return 0;
4477 }
4478
4479 static long btrfs_ioctl_logical_to_ino(struct btrfs_root *root,
4480 void __user *arg)
4481 {
4482 int ret = 0;
4483 int size;
4484 struct btrfs_ioctl_logical_ino_args *loi;
4485 struct btrfs_data_container *inodes = NULL;
4486 struct btrfs_path *path = NULL;
4487
4488 if (!capable(CAP_SYS_ADMIN))
4489 return -EPERM;
4490
4491 loi = memdup_user(arg, sizeof(*loi));
4492 if (IS_ERR(loi)) {
4493 ret = PTR_ERR(loi);
4494 loi = NULL;
4495 goto out;
4496 }
4497
4498 path = btrfs_alloc_path();
4499 if (!path) {
4500 ret = -ENOMEM;
4501 goto out;
4502 }
4503
4504 size = min_t(u32, loi->size, SZ_64K);
4505 inodes = init_data_container(size);
4506 if (IS_ERR(inodes)) {
4507 ret = PTR_ERR(inodes);
4508 inodes = NULL;
4509 goto out;
4510 }
4511
4512 ret = iterate_inodes_from_logical(loi->logical, root->fs_info, path,
4513 build_ino_list, inodes);
4514 if (ret == -EINVAL)
4515 ret = -ENOENT;
4516 if (ret < 0)
4517 goto out;
4518
4519 ret = copy_to_user((void *)(unsigned long)loi->inodes,
4520 (void *)(unsigned long)inodes, size);
4521 if (ret)
4522 ret = -EFAULT;
4523
4524 out:
4525 btrfs_free_path(path);
4526 vfree(inodes);
4527 kfree(loi);
4528
4529 return ret;
4530 }
4531
4532 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
4533 struct btrfs_ioctl_balance_args *bargs)
4534 {
4535 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
4536
4537 bargs->flags = bctl->flags;
4538
4539 if (atomic_read(&fs_info->balance_running))
4540 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
4541 if (atomic_read(&fs_info->balance_pause_req))
4542 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
4543 if (atomic_read(&fs_info->balance_cancel_req))
4544 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
4545
4546 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
4547 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
4548 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
4549
4550 if (lock) {
4551 spin_lock(&fs_info->balance_lock);
4552 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4553 spin_unlock(&fs_info->balance_lock);
4554 } else {
4555 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
4556 }
4557 }
4558
4559 static long btrfs_ioctl_balance(struct file *file, void __user *arg)
4560 {
4561 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4562 struct btrfs_fs_info *fs_info = root->fs_info;
4563 struct btrfs_ioctl_balance_args *bargs;
4564 struct btrfs_balance_control *bctl;
4565 bool need_unlock; /* for mut. excl. ops lock */
4566 int ret;
4567
4568 if (!capable(CAP_SYS_ADMIN))
4569 return -EPERM;
4570
4571 ret = mnt_want_write_file(file);
4572 if (ret)
4573 return ret;
4574
4575 again:
4576 if (!atomic_xchg(&fs_info->mutually_exclusive_operation_running, 1)) {
4577 mutex_lock(&fs_info->volume_mutex);
4578 mutex_lock(&fs_info->balance_mutex);
4579 need_unlock = true;
4580 goto locked;
4581 }
4582
4583 /*
4584 * mut. excl. ops lock is locked. Three possibilites:
4585 * (1) some other op is running
4586 * (2) balance is running
4587 * (3) balance is paused -- special case (think resume)
4588 */
4589 mutex_lock(&fs_info->balance_mutex);
4590 if (fs_info->balance_ctl) {
4591 /* this is either (2) or (3) */
4592 if (!atomic_read(&fs_info->balance_running)) {
4593 mutex_unlock(&fs_info->balance_mutex);
4594 if (!mutex_trylock(&fs_info->volume_mutex))
4595 goto again;
4596 mutex_lock(&fs_info->balance_mutex);
4597
4598 if (fs_info->balance_ctl &&
4599 !atomic_read(&fs_info->balance_running)) {
4600 /* this is (3) */
4601 need_unlock = false;
4602 goto locked;
4603 }
4604
4605 mutex_unlock(&fs_info->balance_mutex);
4606 mutex_unlock(&fs_info->volume_mutex);
4607 goto again;
4608 } else {
4609 /* this is (2) */
4610 mutex_unlock(&fs_info->balance_mutex);
4611 ret = -EINPROGRESS;
4612 goto out;
4613 }
4614 } else {
4615 /* this is (1) */
4616 mutex_unlock(&fs_info->balance_mutex);
4617 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4618 goto out;
4619 }
4620
4621 locked:
4622 BUG_ON(!atomic_read(&fs_info->mutually_exclusive_operation_running));
4623
4624 if (arg) {
4625 bargs = memdup_user(arg, sizeof(*bargs));
4626 if (IS_ERR(bargs)) {
4627 ret = PTR_ERR(bargs);
4628 goto out_unlock;
4629 }
4630
4631 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4632 if (!fs_info->balance_ctl) {
4633 ret = -ENOTCONN;
4634 goto out_bargs;
4635 }
4636
4637 bctl = fs_info->balance_ctl;
4638 spin_lock(&fs_info->balance_lock);
4639 bctl->flags |= BTRFS_BALANCE_RESUME;
4640 spin_unlock(&fs_info->balance_lock);
4641
4642 goto do_balance;
4643 }
4644 } else {
4645 bargs = NULL;
4646 }
4647
4648 if (fs_info->balance_ctl) {
4649 ret = -EINPROGRESS;
4650 goto out_bargs;
4651 }
4652
4653 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4654 if (!bctl) {
4655 ret = -ENOMEM;
4656 goto out_bargs;
4657 }
4658
4659 bctl->fs_info = fs_info;
4660 if (arg) {
4661 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4662 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4663 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4664
4665 bctl->flags = bargs->flags;
4666 } else {
4667 /* balance everything - no filters */
4668 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4669 }
4670
4671 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4672 ret = -EINVAL;
4673 goto out_bctl;
4674 }
4675
4676 do_balance:
4677 /*
4678 * Ownership of bctl and mutually_exclusive_operation_running
4679 * goes to to btrfs_balance. bctl is freed in __cancel_balance,
4680 * or, if restriper was paused all the way until unmount, in
4681 * free_fs_info. mutually_exclusive_operation_running is
4682 * cleared in __cancel_balance.
4683 */
4684 need_unlock = false;
4685
4686 ret = btrfs_balance(bctl, bargs);
4687 bctl = NULL;
4688
4689 if (arg) {
4690 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4691 ret = -EFAULT;
4692 }
4693
4694 out_bctl:
4695 kfree(bctl);
4696 out_bargs:
4697 kfree(bargs);
4698 out_unlock:
4699 mutex_unlock(&fs_info->balance_mutex);
4700 mutex_unlock(&fs_info->volume_mutex);
4701 if (need_unlock)
4702 atomic_set(&fs_info->mutually_exclusive_operation_running, 0);
4703 out:
4704 mnt_drop_write_file(file);
4705 return ret;
4706 }
4707
4708 static long btrfs_ioctl_balance_ctl(struct btrfs_root *root, int cmd)
4709 {
4710 if (!capable(CAP_SYS_ADMIN))
4711 return -EPERM;
4712
4713 switch (cmd) {
4714 case BTRFS_BALANCE_CTL_PAUSE:
4715 return btrfs_pause_balance(root->fs_info);
4716 case BTRFS_BALANCE_CTL_CANCEL:
4717 return btrfs_cancel_balance(root->fs_info);
4718 }
4719
4720 return -EINVAL;
4721 }
4722
4723 static long btrfs_ioctl_balance_progress(struct btrfs_root *root,
4724 void __user *arg)
4725 {
4726 struct btrfs_fs_info *fs_info = root->fs_info;
4727 struct btrfs_ioctl_balance_args *bargs;
4728 int ret = 0;
4729
4730 if (!capable(CAP_SYS_ADMIN))
4731 return -EPERM;
4732
4733 mutex_lock(&fs_info->balance_mutex);
4734 if (!fs_info->balance_ctl) {
4735 ret = -ENOTCONN;
4736 goto out;
4737 }
4738
4739 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4740 if (!bargs) {
4741 ret = -ENOMEM;
4742 goto out;
4743 }
4744
4745 update_ioctl_balance_args(fs_info, 1, bargs);
4746
4747 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4748 ret = -EFAULT;
4749
4750 kfree(bargs);
4751 out:
4752 mutex_unlock(&fs_info->balance_mutex);
4753 return ret;
4754 }
4755
4756 static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4757 {
4758 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4759 struct btrfs_ioctl_quota_ctl_args *sa;
4760 struct btrfs_trans_handle *trans = NULL;
4761 int ret;
4762 int err;
4763
4764 if (!capable(CAP_SYS_ADMIN))
4765 return -EPERM;
4766
4767 ret = mnt_want_write_file(file);
4768 if (ret)
4769 return ret;
4770
4771 sa = memdup_user(arg, sizeof(*sa));
4772 if (IS_ERR(sa)) {
4773 ret = PTR_ERR(sa);
4774 goto drop_write;
4775 }
4776
4777 down_write(&root->fs_info->subvol_sem);
4778 trans = btrfs_start_transaction(root->fs_info->tree_root, 2);
4779 if (IS_ERR(trans)) {
4780 ret = PTR_ERR(trans);
4781 goto out;
4782 }
4783
4784 switch (sa->cmd) {
4785 case BTRFS_QUOTA_CTL_ENABLE:
4786 ret = btrfs_quota_enable(trans, root->fs_info);
4787 break;
4788 case BTRFS_QUOTA_CTL_DISABLE:
4789 ret = btrfs_quota_disable(trans, root->fs_info);
4790 break;
4791 default:
4792 ret = -EINVAL;
4793 break;
4794 }
4795
4796 err = btrfs_commit_transaction(trans, root->fs_info->tree_root);
4797 if (err && !ret)
4798 ret = err;
4799 out:
4800 kfree(sa);
4801 up_write(&root->fs_info->subvol_sem);
4802 drop_write:
4803 mnt_drop_write_file(file);
4804 return ret;
4805 }
4806
4807 static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4808 {
4809 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4810 struct btrfs_ioctl_qgroup_assign_args *sa;
4811 struct btrfs_trans_handle *trans;
4812 int ret;
4813 int err;
4814
4815 if (!capable(CAP_SYS_ADMIN))
4816 return -EPERM;
4817
4818 ret = mnt_want_write_file(file);
4819 if (ret)
4820 return ret;
4821
4822 sa = memdup_user(arg, sizeof(*sa));
4823 if (IS_ERR(sa)) {
4824 ret = PTR_ERR(sa);
4825 goto drop_write;
4826 }
4827
4828 trans = btrfs_join_transaction(root);
4829 if (IS_ERR(trans)) {
4830 ret = PTR_ERR(trans);
4831 goto out;
4832 }
4833
4834 /* FIXME: check if the IDs really exist */
4835 if (sa->assign) {
4836 ret = btrfs_add_qgroup_relation(trans, root->fs_info,
4837 sa->src, sa->dst);
4838 } else {
4839 ret = btrfs_del_qgroup_relation(trans, root->fs_info,
4840 sa->src, sa->dst);
4841 }
4842
4843 /* update qgroup status and info */
4844 err = btrfs_run_qgroups(trans, root->fs_info);
4845 if (err < 0)
4846 btrfs_std_error(root->fs_info, ret,
4847 "failed to update qgroup status and info\n");
4848 err = btrfs_end_transaction(trans, root);
4849 if (err && !ret)
4850 ret = err;
4851
4852 out:
4853 kfree(sa);
4854 drop_write:
4855 mnt_drop_write_file(file);
4856 return ret;
4857 }
4858
4859 static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4860 {
4861 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4862 struct btrfs_ioctl_qgroup_create_args *sa;
4863 struct btrfs_trans_handle *trans;
4864 int ret;
4865 int err;
4866
4867 if (!capable(CAP_SYS_ADMIN))
4868 return -EPERM;
4869
4870 ret = mnt_want_write_file(file);
4871 if (ret)
4872 return ret;
4873
4874 sa = memdup_user(arg, sizeof(*sa));
4875 if (IS_ERR(sa)) {
4876 ret = PTR_ERR(sa);
4877 goto drop_write;
4878 }
4879
4880 if (!sa->qgroupid) {
4881 ret = -EINVAL;
4882 goto out;
4883 }
4884
4885 trans = btrfs_join_transaction(root);
4886 if (IS_ERR(trans)) {
4887 ret = PTR_ERR(trans);
4888 goto out;
4889 }
4890
4891 /* FIXME: check if the IDs really exist */
4892 if (sa->create) {
4893 ret = btrfs_create_qgroup(trans, root->fs_info, sa->qgroupid);
4894 } else {
4895 ret = btrfs_remove_qgroup(trans, root->fs_info, sa->qgroupid);
4896 }
4897
4898 err = btrfs_end_transaction(trans, root);
4899 if (err && !ret)
4900 ret = err;
4901
4902 out:
4903 kfree(sa);
4904 drop_write:
4905 mnt_drop_write_file(file);
4906 return ret;
4907 }
4908
4909 static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4910 {
4911 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4912 struct btrfs_ioctl_qgroup_limit_args *sa;
4913 struct btrfs_trans_handle *trans;
4914 int ret;
4915 int err;
4916 u64 qgroupid;
4917
4918 if (!capable(CAP_SYS_ADMIN))
4919 return -EPERM;
4920
4921 ret = mnt_want_write_file(file);
4922 if (ret)
4923 return ret;
4924
4925 sa = memdup_user(arg, sizeof(*sa));
4926 if (IS_ERR(sa)) {
4927 ret = PTR_ERR(sa);
4928 goto drop_write;
4929 }
4930
4931 trans = btrfs_join_transaction(root);
4932 if (IS_ERR(trans)) {
4933 ret = PTR_ERR(trans);
4934 goto out;
4935 }
4936
4937 qgroupid = sa->qgroupid;
4938 if (!qgroupid) {
4939 /* take the current subvol as qgroup */
4940 qgroupid = root->root_key.objectid;
4941 }
4942
4943 /* FIXME: check if the IDs really exist */
4944 ret = btrfs_limit_qgroup(trans, root->fs_info, qgroupid, &sa->lim);
4945
4946 err = btrfs_end_transaction(trans, root);
4947 if (err && !ret)
4948 ret = err;
4949
4950 out:
4951 kfree(sa);
4952 drop_write:
4953 mnt_drop_write_file(file);
4954 return ret;
4955 }
4956
4957 static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4958 {
4959 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4960 struct btrfs_ioctl_quota_rescan_args *qsa;
4961 int ret;
4962
4963 if (!capable(CAP_SYS_ADMIN))
4964 return -EPERM;
4965
4966 ret = mnt_want_write_file(file);
4967 if (ret)
4968 return ret;
4969
4970 qsa = memdup_user(arg, sizeof(*qsa));
4971 if (IS_ERR(qsa)) {
4972 ret = PTR_ERR(qsa);
4973 goto drop_write;
4974 }
4975
4976 if (qsa->flags) {
4977 ret = -EINVAL;
4978 goto out;
4979 }
4980
4981 ret = btrfs_qgroup_rescan(root->fs_info);
4982
4983 out:
4984 kfree(qsa);
4985 drop_write:
4986 mnt_drop_write_file(file);
4987 return ret;
4988 }
4989
4990 static long btrfs_ioctl_quota_rescan_status(struct file *file, void __user *arg)
4991 {
4992 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
4993 struct btrfs_ioctl_quota_rescan_args *qsa;
4994 int ret = 0;
4995
4996 if (!capable(CAP_SYS_ADMIN))
4997 return -EPERM;
4998
4999 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
5000 if (!qsa)
5001 return -ENOMEM;
5002
5003 if (root->fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
5004 qsa->flags = 1;
5005 qsa->progress = root->fs_info->qgroup_rescan_progress.objectid;
5006 }
5007
5008 if (copy_to_user(arg, qsa, sizeof(*qsa)))
5009 ret = -EFAULT;
5010
5011 kfree(qsa);
5012 return ret;
5013 }
5014
5015 static long btrfs_ioctl_quota_rescan_wait(struct file *file, void __user *arg)
5016 {
5017 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5018
5019 if (!capable(CAP_SYS_ADMIN))
5020 return -EPERM;
5021
5022 return btrfs_qgroup_wait_for_completion(root->fs_info);
5023 }
5024
5025 static long _btrfs_ioctl_set_received_subvol(struct file *file,
5026 struct btrfs_ioctl_received_subvol_args *sa)
5027 {
5028 struct inode *inode = file_inode(file);
5029 struct btrfs_root *root = BTRFS_I(inode)->root;
5030 struct btrfs_root_item *root_item = &root->root_item;
5031 struct btrfs_trans_handle *trans;
5032 struct timespec ct = current_fs_time(inode->i_sb);
5033 int ret = 0;
5034 int received_uuid_changed;
5035
5036 if (!inode_owner_or_capable(inode))
5037 return -EPERM;
5038
5039 ret = mnt_want_write_file(file);
5040 if (ret < 0)
5041 return ret;
5042
5043 down_write(&root->fs_info->subvol_sem);
5044
5045 if (btrfs_ino(inode) != BTRFS_FIRST_FREE_OBJECTID) {
5046 ret = -EINVAL;
5047 goto out;
5048 }
5049
5050 if (btrfs_root_readonly(root)) {
5051 ret = -EROFS;
5052 goto out;
5053 }
5054
5055 /*
5056 * 1 - root item
5057 * 2 - uuid items (received uuid + subvol uuid)
5058 */
5059 trans = btrfs_start_transaction(root, 3);
5060 if (IS_ERR(trans)) {
5061 ret = PTR_ERR(trans);
5062 trans = NULL;
5063 goto out;
5064 }
5065
5066 sa->rtransid = trans->transid;
5067 sa->rtime.sec = ct.tv_sec;
5068 sa->rtime.nsec = ct.tv_nsec;
5069
5070 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
5071 BTRFS_UUID_SIZE);
5072 if (received_uuid_changed &&
5073 !btrfs_is_empty_uuid(root_item->received_uuid))
5074 btrfs_uuid_tree_rem(trans, root->fs_info->uuid_root,
5075 root_item->received_uuid,
5076 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5077 root->root_key.objectid);
5078 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);
5079 btrfs_set_root_stransid(root_item, sa->stransid);
5080 btrfs_set_root_rtransid(root_item, sa->rtransid);
5081 btrfs_set_stack_timespec_sec(&root_item->stime, sa->stime.sec);
5082 btrfs_set_stack_timespec_nsec(&root_item->stime, sa->stime.nsec);
5083 btrfs_set_stack_timespec_sec(&root_item->rtime, sa->rtime.sec);
5084 btrfs_set_stack_timespec_nsec(&root_item->rtime, sa->rtime.nsec);
5085
5086 ret = btrfs_update_root(trans, root->fs_info->tree_root,
5087 &root->root_key, &root->root_item);
5088 if (ret < 0) {
5089 btrfs_end_transaction(trans, root);
5090 goto out;
5091 }
5092 if (received_uuid_changed && !btrfs_is_empty_uuid(sa->uuid)) {
5093 ret = btrfs_uuid_tree_add(trans, root->fs_info->uuid_root,
5094 sa->uuid,
5095 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
5096 root->root_key.objectid);
5097 if (ret < 0 && ret != -EEXIST) {
5098 btrfs_abort_transaction(trans, root, ret);
5099 goto out;
5100 }
5101 }
5102 ret = btrfs_commit_transaction(trans, root);
5103 if (ret < 0) {
5104 btrfs_abort_transaction(trans, root, ret);
5105 goto out;
5106 }
5107
5108 out:
5109 up_write(&root->fs_info->subvol_sem);
5110 mnt_drop_write_file(file);
5111 return ret;
5112 }
5113
5114 #ifdef CONFIG_64BIT
5115 static long btrfs_ioctl_set_received_subvol_32(struct file *file,
5116 void __user *arg)
5117 {
5118 struct btrfs_ioctl_received_subvol_args_32 *args32 = NULL;
5119 struct btrfs_ioctl_received_subvol_args *args64 = NULL;
5120 int ret = 0;
5121
5122 args32 = memdup_user(arg, sizeof(*args32));
5123 if (IS_ERR(args32)) {
5124 ret = PTR_ERR(args32);
5125 args32 = NULL;
5126 goto out;
5127 }
5128
5129 args64 = kmalloc(sizeof(*args64), GFP_KERNEL);
5130 if (!args64) {
5131 ret = -ENOMEM;
5132 goto out;
5133 }
5134
5135 memcpy(args64->uuid, args32->uuid, BTRFS_UUID_SIZE);
5136 args64->stransid = args32->stransid;
5137 args64->rtransid = args32->rtransid;
5138 args64->stime.sec = args32->stime.sec;
5139 args64->stime.nsec = args32->stime.nsec;
5140 args64->rtime.sec = args32->rtime.sec;
5141 args64->rtime.nsec = args32->rtime.nsec;
5142 args64->flags = args32->flags;
5143
5144 ret = _btrfs_ioctl_set_received_subvol(file, args64);
5145 if (ret)
5146 goto out;
5147
5148 memcpy(args32->uuid, args64->uuid, BTRFS_UUID_SIZE);
5149 args32->stransid = args64->stransid;
5150 args32->rtransid = args64->rtransid;
5151 args32->stime.sec = args64->stime.sec;
5152 args32->stime.nsec = args64->stime.nsec;
5153 args32->rtime.sec = args64->rtime.sec;
5154 args32->rtime.nsec = args64->rtime.nsec;
5155 args32->flags = args64->flags;
5156
5157 ret = copy_to_user(arg, args32, sizeof(*args32));
5158 if (ret)
5159 ret = -EFAULT;
5160
5161 out:
5162 kfree(args32);
5163 kfree(args64);
5164 return ret;
5165 }
5166 #endif
5167
5168 static long btrfs_ioctl_set_received_subvol(struct file *file,
5169 void __user *arg)
5170 {
5171 struct btrfs_ioctl_received_subvol_args *sa = NULL;
5172 int ret = 0;
5173
5174 sa = memdup_user(arg, sizeof(*sa));
5175 if (IS_ERR(sa)) {
5176 ret = PTR_ERR(sa);
5177 sa = NULL;
5178 goto out;
5179 }
5180
5181 ret = _btrfs_ioctl_set_received_subvol(file, sa);
5182
5183 if (ret)
5184 goto out;
5185
5186 ret = copy_to_user(arg, sa, sizeof(*sa));
5187 if (ret)
5188 ret = -EFAULT;
5189
5190 out:
5191 kfree(sa);
5192 return ret;
5193 }
5194
5195 static int btrfs_ioctl_get_fslabel(struct file *file, void __user *arg)
5196 {
5197 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5198 size_t len;
5199 int ret;
5200 char label[BTRFS_LABEL_SIZE];
5201
5202 spin_lock(&root->fs_info->super_lock);
5203 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
5204 spin_unlock(&root->fs_info->super_lock);
5205
5206 len = strnlen(label, BTRFS_LABEL_SIZE);
5207
5208 if (len == BTRFS_LABEL_SIZE) {
5209 btrfs_warn(root->fs_info,
5210 "label is too long, return the first %zu bytes", --len);
5211 }
5212
5213 ret = copy_to_user(arg, label, len);
5214
5215 return ret ? -EFAULT : 0;
5216 }
5217
5218 static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
5219 {
5220 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5221 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5222 struct btrfs_trans_handle *trans;
5223 char label[BTRFS_LABEL_SIZE];
5224 int ret;
5225
5226 if (!capable(CAP_SYS_ADMIN))
5227 return -EPERM;
5228
5229 if (copy_from_user(label, arg, sizeof(label)))
5230 return -EFAULT;
5231
5232 if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
5233 btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
5234 BTRFS_LABEL_SIZE - 1);
5235 return -EINVAL;
5236 }
5237
5238 ret = mnt_want_write_file(file);
5239 if (ret)
5240 return ret;
5241
5242 trans = btrfs_start_transaction(root, 0);
5243 if (IS_ERR(trans)) {
5244 ret = PTR_ERR(trans);
5245 goto out_unlock;
5246 }
5247
5248 spin_lock(&root->fs_info->super_lock);
5249 strcpy(super_block->label, label);
5250 spin_unlock(&root->fs_info->super_lock);
5251 ret = btrfs_commit_transaction(trans, root);
5252
5253 out_unlock:
5254 mnt_drop_write_file(file);
5255 return ret;
5256 }
5257
5258 #define INIT_FEATURE_FLAGS(suffix) \
5259 { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
5260 .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
5261 .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
5262
5263 int btrfs_ioctl_get_supported_features(void __user *arg)
5264 {
5265 static const struct btrfs_ioctl_feature_flags features[3] = {
5266 INIT_FEATURE_FLAGS(SUPP),
5267 INIT_FEATURE_FLAGS(SAFE_SET),
5268 INIT_FEATURE_FLAGS(SAFE_CLEAR)
5269 };
5270
5271 if (copy_to_user(arg, &features, sizeof(features)))
5272 return -EFAULT;
5273
5274 return 0;
5275 }
5276
5277 static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
5278 {
5279 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5280 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5281 struct btrfs_ioctl_feature_flags features;
5282
5283 features.compat_flags = btrfs_super_compat_flags(super_block);
5284 features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
5285 features.incompat_flags = btrfs_super_incompat_flags(super_block);
5286
5287 if (copy_to_user(arg, &features, sizeof(features)))
5288 return -EFAULT;
5289
5290 return 0;
5291 }
5292
5293 static int check_feature_bits(struct btrfs_root *root,
5294 enum btrfs_feature_set set,
5295 u64 change_mask, u64 flags, u64 supported_flags,
5296 u64 safe_set, u64 safe_clear)
5297 {
5298 const char *type = btrfs_feature_set_names[set];
5299 char *names;
5300 u64 disallowed, unsupported;
5301 u64 set_mask = flags & change_mask;
5302 u64 clear_mask = ~flags & change_mask;
5303
5304 unsupported = set_mask & ~supported_flags;
5305 if (unsupported) {
5306 names = btrfs_printable_features(set, unsupported);
5307 if (names) {
5308 btrfs_warn(root->fs_info,
5309 "this kernel does not support the %s feature bit%s",
5310 names, strchr(names, ',') ? "s" : "");
5311 kfree(names);
5312 } else
5313 btrfs_warn(root->fs_info,
5314 "this kernel does not support %s bits 0x%llx",
5315 type, unsupported);
5316 return -EOPNOTSUPP;
5317 }
5318
5319 disallowed = set_mask & ~safe_set;
5320 if (disallowed) {
5321 names = btrfs_printable_features(set, disallowed);
5322 if (names) {
5323 btrfs_warn(root->fs_info,
5324 "can't set the %s feature bit%s while mounted",
5325 names, strchr(names, ',') ? "s" : "");
5326 kfree(names);
5327 } else
5328 btrfs_warn(root->fs_info,
5329 "can't set %s bits 0x%llx while mounted",
5330 type, disallowed);
5331 return -EPERM;
5332 }
5333
5334 disallowed = clear_mask & ~safe_clear;
5335 if (disallowed) {
5336 names = btrfs_printable_features(set, disallowed);
5337 if (names) {
5338 btrfs_warn(root->fs_info,
5339 "can't clear the %s feature bit%s while mounted",
5340 names, strchr(names, ',') ? "s" : "");
5341 kfree(names);
5342 } else
5343 btrfs_warn(root->fs_info,
5344 "can't clear %s bits 0x%llx while mounted",
5345 type, disallowed);
5346 return -EPERM;
5347 }
5348
5349 return 0;
5350 }
5351
5352 #define check_feature(root, change_mask, flags, mask_base) \
5353 check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
5354 BTRFS_FEATURE_ ## mask_base ## _SUPP, \
5355 BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
5356 BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
5357
5358 static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
5359 {
5360 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5361 struct btrfs_super_block *super_block = root->fs_info->super_copy;
5362 struct btrfs_ioctl_feature_flags flags[2];
5363 struct btrfs_trans_handle *trans;
5364 u64 newflags;
5365 int ret;
5366
5367 if (!capable(CAP_SYS_ADMIN))
5368 return -EPERM;
5369
5370 if (copy_from_user(flags, arg, sizeof(flags)))
5371 return -EFAULT;
5372
5373 /* Nothing to do */
5374 if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
5375 !flags[0].incompat_flags)
5376 return 0;
5377
5378 ret = check_feature(root, flags[0].compat_flags,
5379 flags[1].compat_flags, COMPAT);
5380 if (ret)
5381 return ret;
5382
5383 ret = check_feature(root, flags[0].compat_ro_flags,
5384 flags[1].compat_ro_flags, COMPAT_RO);
5385 if (ret)
5386 return ret;
5387
5388 ret = check_feature(root, flags[0].incompat_flags,
5389 flags[1].incompat_flags, INCOMPAT);
5390 if (ret)
5391 return ret;
5392
5393 trans = btrfs_start_transaction(root, 0);
5394 if (IS_ERR(trans))
5395 return PTR_ERR(trans);
5396
5397 spin_lock(&root->fs_info->super_lock);
5398 newflags = btrfs_super_compat_flags(super_block);
5399 newflags |= flags[0].compat_flags & flags[1].compat_flags;
5400 newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
5401 btrfs_set_super_compat_flags(super_block, newflags);
5402
5403 newflags = btrfs_super_compat_ro_flags(super_block);
5404 newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
5405 newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
5406 btrfs_set_super_compat_ro_flags(super_block, newflags);
5407
5408 newflags = btrfs_super_incompat_flags(super_block);
5409 newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
5410 newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
5411 btrfs_set_super_incompat_flags(super_block, newflags);
5412 spin_unlock(&root->fs_info->super_lock);
5413
5414 return btrfs_commit_transaction(trans, root);
5415 }
5416
5417 long btrfs_ioctl(struct file *file, unsigned int
5418 cmd, unsigned long arg)
5419 {
5420 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
5421 void __user *argp = (void __user *)arg;
5422
5423 switch (cmd) {
5424 case FS_IOC_GETFLAGS:
5425 return btrfs_ioctl_getflags(file, argp);
5426 case FS_IOC_SETFLAGS:
5427 return btrfs_ioctl_setflags(file, argp);
5428 case FS_IOC_GETVERSION:
5429 return btrfs_ioctl_getversion(file, argp);
5430 case FITRIM:
5431 return btrfs_ioctl_fitrim(file, argp);
5432 case BTRFS_IOC_SNAP_CREATE:
5433 return btrfs_ioctl_snap_create(file, argp, 0);
5434 case BTRFS_IOC_SNAP_CREATE_V2:
5435 return btrfs_ioctl_snap_create_v2(file, argp, 0);
5436 case BTRFS_IOC_SUBVOL_CREATE:
5437 return btrfs_ioctl_snap_create(file, argp, 1);
5438 case BTRFS_IOC_SUBVOL_CREATE_V2:
5439 return btrfs_ioctl_snap_create_v2(file, argp, 1);
5440 case BTRFS_IOC_SNAP_DESTROY:
5441 return btrfs_ioctl_snap_destroy(file, argp);
5442 case BTRFS_IOC_SUBVOL_GETFLAGS:
5443 return btrfs_ioctl_subvol_getflags(file, argp);
5444 case BTRFS_IOC_SUBVOL_SETFLAGS:
5445 return btrfs_ioctl_subvol_setflags(file, argp);
5446 case BTRFS_IOC_DEFAULT_SUBVOL:
5447 return btrfs_ioctl_default_subvol(file, argp);
5448 case BTRFS_IOC_DEFRAG:
5449 return btrfs_ioctl_defrag(file, NULL);
5450 case BTRFS_IOC_DEFRAG_RANGE:
5451 return btrfs_ioctl_defrag(file, argp);
5452 case BTRFS_IOC_RESIZE:
5453 return btrfs_ioctl_resize(file, argp);
5454 case BTRFS_IOC_ADD_DEV:
5455 return btrfs_ioctl_add_dev(root, argp);
5456 case BTRFS_IOC_RM_DEV:
5457 return btrfs_ioctl_rm_dev(file, argp);
5458 case BTRFS_IOC_FS_INFO:
5459 return btrfs_ioctl_fs_info(root, argp);
5460 case BTRFS_IOC_DEV_INFO:
5461 return btrfs_ioctl_dev_info(root, argp);
5462 case BTRFS_IOC_BALANCE:
5463 return btrfs_ioctl_balance(file, NULL);
5464 case BTRFS_IOC_TRANS_START:
5465 return btrfs_ioctl_trans_start(file);
5466 case BTRFS_IOC_TRANS_END:
5467 return btrfs_ioctl_trans_end(file);
5468 case BTRFS_IOC_TREE_SEARCH:
5469 return btrfs_ioctl_tree_search(file, argp);
5470 case BTRFS_IOC_TREE_SEARCH_V2:
5471 return btrfs_ioctl_tree_search_v2(file, argp);
5472 case BTRFS_IOC_INO_LOOKUP:
5473 return btrfs_ioctl_ino_lookup(file, argp);
5474 case BTRFS_IOC_INO_PATHS:
5475 return btrfs_ioctl_ino_to_path(root, argp);
5476 case BTRFS_IOC_LOGICAL_INO:
5477 return btrfs_ioctl_logical_to_ino(root, argp);
5478 case BTRFS_IOC_SPACE_INFO:
5479 return btrfs_ioctl_space_info(root, argp);
5480 case BTRFS_IOC_SYNC: {
5481 int ret;
5482
5483 ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1);
5484 if (ret)
5485 return ret;
5486 ret = btrfs_sync_fs(file_inode(file)->i_sb, 1);
5487 /*
5488 * The transaction thread may want to do more work,
5489 * namely it pokes the cleaner ktread that will start
5490 * processing uncleaned subvols.
5491 */
5492 wake_up_process(root->fs_info->transaction_kthread);
5493 return ret;
5494 }
5495 case BTRFS_IOC_START_SYNC:
5496 return btrfs_ioctl_start_sync(root, argp);
5497 case BTRFS_IOC_WAIT_SYNC:
5498 return btrfs_ioctl_wait_sync(root, argp);
5499 case BTRFS_IOC_SCRUB:
5500 return btrfs_ioctl_scrub(file, argp);
5501 case BTRFS_IOC_SCRUB_CANCEL:
5502 return btrfs_ioctl_scrub_cancel(root, argp);
5503 case BTRFS_IOC_SCRUB_PROGRESS:
5504 return btrfs_ioctl_scrub_progress(root, argp);
5505 case BTRFS_IOC_BALANCE_V2:
5506 return btrfs_ioctl_balance(file, argp);
5507 case BTRFS_IOC_BALANCE_CTL:
5508 return btrfs_ioctl_balance_ctl(root, arg);
5509 case BTRFS_IOC_BALANCE_PROGRESS:
5510 return btrfs_ioctl_balance_progress(root, argp);
5511 case BTRFS_IOC_SET_RECEIVED_SUBVOL:
5512 return btrfs_ioctl_set_received_subvol(file, argp);
5513 #ifdef CONFIG_64BIT
5514 case BTRFS_IOC_SET_RECEIVED_SUBVOL_32:
5515 return btrfs_ioctl_set_received_subvol_32(file, argp);
5516 #endif
5517 case BTRFS_IOC_SEND:
5518 return btrfs_ioctl_send(file, argp);
5519 case BTRFS_IOC_GET_DEV_STATS:
5520 return btrfs_ioctl_get_dev_stats(root, argp);
5521 case BTRFS_IOC_QUOTA_CTL:
5522 return btrfs_ioctl_quota_ctl(file, argp);
5523 case BTRFS_IOC_QGROUP_ASSIGN:
5524 return btrfs_ioctl_qgroup_assign(file, argp);
5525 case BTRFS_IOC_QGROUP_CREATE:
5526 return btrfs_ioctl_qgroup_create(file, argp);
5527 case BTRFS_IOC_QGROUP_LIMIT:
5528 return btrfs_ioctl_qgroup_limit(file, argp);
5529 case BTRFS_IOC_QUOTA_RESCAN:
5530 return btrfs_ioctl_quota_rescan(file, argp);
5531 case BTRFS_IOC_QUOTA_RESCAN_STATUS:
5532 return btrfs_ioctl_quota_rescan_status(file, argp);
5533 case BTRFS_IOC_QUOTA_RESCAN_WAIT:
5534 return btrfs_ioctl_quota_rescan_wait(file, argp);
5535 case BTRFS_IOC_DEV_REPLACE:
5536 return btrfs_ioctl_dev_replace(root, argp);
5537 case BTRFS_IOC_GET_FSLABEL:
5538 return btrfs_ioctl_get_fslabel(file, argp);
5539 case BTRFS_IOC_SET_FSLABEL:
5540 return btrfs_ioctl_set_fslabel(file, argp);
5541 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
5542 return btrfs_ioctl_get_supported_features(argp);
5543 case BTRFS_IOC_GET_FEATURES:
5544 return btrfs_ioctl_get_features(file, argp);
5545 case BTRFS_IOC_SET_FEATURES:
5546 return btrfs_ioctl_set_features(file, argp);
5547 }
5548
5549 return -ENOTTY;
5550 }
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