1
2
3
4
5
6#include <linux/kernel.h>
7#include <linux/bio.h>
8#include <linux/file.h>
9#include <linux/fs.h>
10#include <linux/fsnotify.h>
11#include <linux/pagemap.h>
12#include <linux/highmem.h>
13#include <linux/time.h>
14#include <linux/string.h>
15#include <linux/backing-dev.h>
16#include <linux/mount.h>
17#include <linux/namei.h>
18#include <linux/writeback.h>
19#include <linux/compat.h>
20#include <linux/security.h>
21#include <linux/xattr.h>
22#include <linux/mm.h>
23#include <linux/slab.h>
24#include <linux/blkdev.h>
25#include <linux/uuid.h>
26#include <linux/btrfs.h>
27#include <linux/uaccess.h>
28#include <linux/iversion.h>
29#include <linux/fileattr.h>
30#include "ctree.h"
31#include "disk-io.h"
32#include "export.h"
33#include "transaction.h"
34#include "btrfs_inode.h"
35#include "print-tree.h"
36#include "volumes.h"
37#include "locking.h"
38#include "backref.h"
39#include "rcu-string.h"
40#include "send.h"
41#include "dev-replace.h"
42#include "props.h"
43#include "sysfs.h"
44#include "qgroup.h"
45#include "tree-log.h"
46#include "compression.h"
47#include "space-info.h"
48#include "delalloc-space.h"
49#include "block-group.h"
50
51#ifdef CONFIG_64BIT
52
53
54
55
56
57struct btrfs_ioctl_timespec_32 {
58 __u64 sec;
59 __u32 nsec;
60} __attribute__ ((__packed__));
61
62struct btrfs_ioctl_received_subvol_args_32 {
63 char uuid[BTRFS_UUID_SIZE];
64 __u64 stransid;
65 __u64 rtransid;
66 struct btrfs_ioctl_timespec_32 stime;
67 struct btrfs_ioctl_timespec_32 rtime;
68 __u64 flags;
69 __u64 reserved[16];
70} __attribute__ ((__packed__));
71
72#define BTRFS_IOC_SET_RECEIVED_SUBVOL_32 _IOWR(BTRFS_IOCTL_MAGIC, 37, \
73 struct btrfs_ioctl_received_subvol_args_32)
74#endif
75
76#if defined(CONFIG_64BIT) && defined(CONFIG_COMPAT)
77struct btrfs_ioctl_send_args_32 {
78 __s64 send_fd;
79 __u64 clone_sources_count;
80 compat_uptr_t clone_sources;
81 __u64 parent_root;
82 __u64 flags;
83 __u64 reserved[4];
84} __attribute__ ((__packed__));
85
86#define BTRFS_IOC_SEND_32 _IOW(BTRFS_IOCTL_MAGIC, 38, \
87 struct btrfs_ioctl_send_args_32)
88#endif
89
90
91static unsigned int btrfs_mask_fsflags_for_type(struct inode *inode,
92 unsigned int flags)
93{
94 if (S_ISDIR(inode->i_mode))
95 return flags;
96 else if (S_ISREG(inode->i_mode))
97 return flags & ~FS_DIRSYNC_FL;
98 else
99 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
100}
101
102
103
104
105
106static unsigned int btrfs_inode_flags_to_fsflags(unsigned int flags)
107{
108 unsigned int iflags = 0;
109
110 if (flags & BTRFS_INODE_SYNC)
111 iflags |= FS_SYNC_FL;
112 if (flags & BTRFS_INODE_IMMUTABLE)
113 iflags |= FS_IMMUTABLE_FL;
114 if (flags & BTRFS_INODE_APPEND)
115 iflags |= FS_APPEND_FL;
116 if (flags & BTRFS_INODE_NODUMP)
117 iflags |= FS_NODUMP_FL;
118 if (flags & BTRFS_INODE_NOATIME)
119 iflags |= FS_NOATIME_FL;
120 if (flags & BTRFS_INODE_DIRSYNC)
121 iflags |= FS_DIRSYNC_FL;
122 if (flags & BTRFS_INODE_NODATACOW)
123 iflags |= FS_NOCOW_FL;
124
125 if (flags & BTRFS_INODE_NOCOMPRESS)
126 iflags |= FS_NOCOMP_FL;
127 else if (flags & BTRFS_INODE_COMPRESS)
128 iflags |= FS_COMPR_FL;
129
130 return iflags;
131}
132
133
134
135
136void btrfs_sync_inode_flags_to_i_flags(struct inode *inode)
137{
138 struct btrfs_inode *binode = BTRFS_I(inode);
139 unsigned int new_fl = 0;
140
141 if (binode->flags & BTRFS_INODE_SYNC)
142 new_fl |= S_SYNC;
143 if (binode->flags & BTRFS_INODE_IMMUTABLE)
144 new_fl |= S_IMMUTABLE;
145 if (binode->flags & BTRFS_INODE_APPEND)
146 new_fl |= S_APPEND;
147 if (binode->flags & BTRFS_INODE_NOATIME)
148 new_fl |= S_NOATIME;
149 if (binode->flags & BTRFS_INODE_DIRSYNC)
150 new_fl |= S_DIRSYNC;
151
152 set_mask_bits(&inode->i_flags,
153 S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC,
154 new_fl);
155}
156
157
158
159
160
161static int check_fsflags(unsigned int old_flags, unsigned int flags)
162{
163 if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \
164 FS_NOATIME_FL | FS_NODUMP_FL | \
165 FS_SYNC_FL | FS_DIRSYNC_FL | \
166 FS_NOCOMP_FL | FS_COMPR_FL |
167 FS_NOCOW_FL))
168 return -EOPNOTSUPP;
169
170
171 if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL))
172 return -EINVAL;
173
174 if ((flags & FS_COMPR_FL) && (flags & FS_NOCOW_FL))
175 return -EINVAL;
176
177
178 if ((old_flags & FS_NOCOW_FL) && (flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
179 return -EINVAL;
180 if ((flags & FS_NOCOW_FL) && (old_flags & (FS_COMPR_FL | FS_NOCOMP_FL)))
181 return -EINVAL;
182
183 return 0;
184}
185
186static int check_fsflags_compatible(struct btrfs_fs_info *fs_info,
187 unsigned int flags)
188{
189 if (btrfs_is_zoned(fs_info) && (flags & FS_NOCOW_FL))
190 return -EPERM;
191
192 return 0;
193}
194
195
196
197
198
199int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
200{
201 struct btrfs_inode *binode = BTRFS_I(d_inode(dentry));
202
203 fileattr_fill_flags(fa, btrfs_inode_flags_to_fsflags(binode->flags));
204 return 0;
205}
206
207int btrfs_fileattr_set(struct user_namespace *mnt_userns,
208 struct dentry *dentry, struct fileattr *fa)
209{
210 struct inode *inode = d_inode(dentry);
211 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
212 struct btrfs_inode *binode = BTRFS_I(inode);
213 struct btrfs_root *root = binode->root;
214 struct btrfs_trans_handle *trans;
215 unsigned int fsflags, old_fsflags;
216 int ret;
217 const char *comp = NULL;
218 u32 binode_flags;
219
220 if (btrfs_root_readonly(root))
221 return -EROFS;
222
223 if (fileattr_has_fsx(fa))
224 return -EOPNOTSUPP;
225
226 fsflags = btrfs_mask_fsflags_for_type(inode, fa->flags);
227 old_fsflags = btrfs_inode_flags_to_fsflags(binode->flags);
228 ret = check_fsflags(old_fsflags, fsflags);
229 if (ret)
230 return ret;
231
232 ret = check_fsflags_compatible(fs_info, fsflags);
233 if (ret)
234 return ret;
235
236 binode_flags = binode->flags;
237 if (fsflags & FS_SYNC_FL)
238 binode_flags |= BTRFS_INODE_SYNC;
239 else
240 binode_flags &= ~BTRFS_INODE_SYNC;
241 if (fsflags & FS_IMMUTABLE_FL)
242 binode_flags |= BTRFS_INODE_IMMUTABLE;
243 else
244 binode_flags &= ~BTRFS_INODE_IMMUTABLE;
245 if (fsflags & FS_APPEND_FL)
246 binode_flags |= BTRFS_INODE_APPEND;
247 else
248 binode_flags &= ~BTRFS_INODE_APPEND;
249 if (fsflags & FS_NODUMP_FL)
250 binode_flags |= BTRFS_INODE_NODUMP;
251 else
252 binode_flags &= ~BTRFS_INODE_NODUMP;
253 if (fsflags & FS_NOATIME_FL)
254 binode_flags |= BTRFS_INODE_NOATIME;
255 else
256 binode_flags &= ~BTRFS_INODE_NOATIME;
257
258
259 if (!fa->flags_valid) {
260
261 trans = btrfs_start_transaction(root, 1);
262 if (IS_ERR(trans))
263 return PTR_ERR(trans);
264 goto update_flags;
265 }
266
267 if (fsflags & FS_DIRSYNC_FL)
268 binode_flags |= BTRFS_INODE_DIRSYNC;
269 else
270 binode_flags &= ~BTRFS_INODE_DIRSYNC;
271 if (fsflags & FS_NOCOW_FL) {
272 if (S_ISREG(inode->i_mode)) {
273
274
275
276
277
278 if (inode->i_size == 0)
279 binode_flags |= BTRFS_INODE_NODATACOW |
280 BTRFS_INODE_NODATASUM;
281 } else {
282 binode_flags |= BTRFS_INODE_NODATACOW;
283 }
284 } else {
285
286
287
288 if (S_ISREG(inode->i_mode)) {
289 if (inode->i_size == 0)
290 binode_flags &= ~(BTRFS_INODE_NODATACOW |
291 BTRFS_INODE_NODATASUM);
292 } else {
293 binode_flags &= ~BTRFS_INODE_NODATACOW;
294 }
295 }
296
297
298
299
300
301
302 if (fsflags & FS_NOCOMP_FL) {
303 binode_flags &= ~BTRFS_INODE_COMPRESS;
304 binode_flags |= BTRFS_INODE_NOCOMPRESS;
305 } else if (fsflags & FS_COMPR_FL) {
306
307 if (IS_SWAPFILE(inode))
308 return -ETXTBSY;
309
310 binode_flags |= BTRFS_INODE_COMPRESS;
311 binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
312
313 comp = btrfs_compress_type2str(fs_info->compress_type);
314 if (!comp || comp[0] == 0)
315 comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
316 } else {
317 binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
318 }
319
320
321
322
323
324 trans = btrfs_start_transaction(root, 3);
325 if (IS_ERR(trans))
326 return PTR_ERR(trans);
327
328 if (comp) {
329 ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
330 strlen(comp), 0);
331 if (ret) {
332 btrfs_abort_transaction(trans, ret);
333 goto out_end_trans;
334 }
335 } else {
336 ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
337 0, 0);
338 if (ret && ret != -ENODATA) {
339 btrfs_abort_transaction(trans, ret);
340 goto out_end_trans;
341 }
342 }
343
344update_flags:
345 binode->flags = binode_flags;
346 btrfs_sync_inode_flags_to_i_flags(inode);
347 inode_inc_iversion(inode);
348 inode->i_ctime = current_time(inode);
349 ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
350
351 out_end_trans:
352 btrfs_end_transaction(trans);
353 return ret;
354}
355
356
357
358
359bool btrfs_exclop_start(struct btrfs_fs_info *fs_info,
360 enum btrfs_exclusive_operation type)
361{
362 bool ret = false;
363
364 spin_lock(&fs_info->super_lock);
365 if (fs_info->exclusive_operation == BTRFS_EXCLOP_NONE) {
366 fs_info->exclusive_operation = type;
367 ret = true;
368 }
369 spin_unlock(&fs_info->super_lock);
370
371 return ret;
372}
373
374
375
376
377
378
379
380
381
382
383
384bool btrfs_exclop_start_try_lock(struct btrfs_fs_info *fs_info,
385 enum btrfs_exclusive_operation type)
386{
387 spin_lock(&fs_info->super_lock);
388 if (fs_info->exclusive_operation == type)
389 return true;
390
391 spin_unlock(&fs_info->super_lock);
392 return false;
393}
394
395void btrfs_exclop_start_unlock(struct btrfs_fs_info *fs_info)
396{
397 spin_unlock(&fs_info->super_lock);
398}
399
400void btrfs_exclop_finish(struct btrfs_fs_info *fs_info)
401{
402 spin_lock(&fs_info->super_lock);
403 WRITE_ONCE(fs_info->exclusive_operation, BTRFS_EXCLOP_NONE);
404 spin_unlock(&fs_info->super_lock);
405 sysfs_notify(&fs_info->fs_devices->fsid_kobj, NULL, "exclusive_operation");
406}
407
408static int btrfs_ioctl_getversion(struct file *file, int __user *arg)
409{
410 struct inode *inode = file_inode(file);
411
412 return put_user(inode->i_generation, arg);
413}
414
415static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
416 void __user *arg)
417{
418 struct btrfs_device *device;
419 struct request_queue *q;
420 struct fstrim_range range;
421 u64 minlen = ULLONG_MAX;
422 u64 num_devices = 0;
423 int ret;
424
425 if (!capable(CAP_SYS_ADMIN))
426 return -EPERM;
427
428
429
430
431
432
433 if (btrfs_is_zoned(fs_info))
434 return -EOPNOTSUPP;
435
436
437
438
439
440
441
442
443 if (btrfs_test_opt(fs_info, NOLOGREPLAY))
444 return -EROFS;
445
446 rcu_read_lock();
447 list_for_each_entry_rcu(device, &fs_info->fs_devices->devices,
448 dev_list) {
449 if (!device->bdev)
450 continue;
451 q = bdev_get_queue(device->bdev);
452 if (blk_queue_discard(q)) {
453 num_devices++;
454 minlen = min_t(u64, q->limits.discard_granularity,
455 minlen);
456 }
457 }
458 rcu_read_unlock();
459
460 if (!num_devices)
461 return -EOPNOTSUPP;
462 if (copy_from_user(&range, arg, sizeof(range)))
463 return -EFAULT;
464
465
466
467
468
469
470 if (range.len < fs_info->sb->s_blocksize)
471 return -EINVAL;
472
473 range.minlen = max(range.minlen, minlen);
474 ret = btrfs_trim_fs(fs_info, &range);
475 if (ret < 0)
476 return ret;
477
478 if (copy_to_user(arg, &range, sizeof(range)))
479 return -EFAULT;
480
481 return 0;
482}
483
484int __pure btrfs_is_empty_uuid(u8 *uuid)
485{
486 int i;
487
488 for (i = 0; i < BTRFS_UUID_SIZE; i++) {
489 if (uuid[i])
490 return 0;
491 }
492 return 1;
493}
494
495static noinline int create_subvol(struct inode *dir,
496 struct dentry *dentry,
497 const char *name, int namelen,
498 struct btrfs_qgroup_inherit *inherit)
499{
500 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
501 struct btrfs_trans_handle *trans;
502 struct btrfs_key key;
503 struct btrfs_root_item *root_item;
504 struct btrfs_inode_item *inode_item;
505 struct extent_buffer *leaf;
506 struct btrfs_root *root = BTRFS_I(dir)->root;
507 struct btrfs_root *new_root;
508 struct btrfs_block_rsv block_rsv;
509 struct timespec64 cur_time = current_time(dir);
510 struct inode *inode;
511 int ret;
512 int err;
513 dev_t anon_dev = 0;
514 u64 objectid;
515 u64 index = 0;
516
517 root_item = kzalloc(sizeof(*root_item), GFP_KERNEL);
518 if (!root_item)
519 return -ENOMEM;
520
521 ret = btrfs_get_free_objectid(fs_info->tree_root, &objectid);
522 if (ret)
523 goto fail_free;
524
525 ret = get_anon_bdev(&anon_dev);
526 if (ret < 0)
527 goto fail_free;
528
529
530
531
532
533 if (btrfs_qgroup_level(objectid)) {
534 ret = -ENOSPC;
535 goto fail_free;
536 }
537
538 btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
539
540
541
542
543 ret = btrfs_subvolume_reserve_metadata(root, &block_rsv, 8, false);
544 if (ret)
545 goto fail_free;
546
547 trans = btrfs_start_transaction(root, 0);
548 if (IS_ERR(trans)) {
549 ret = PTR_ERR(trans);
550 btrfs_subvolume_release_metadata(root, &block_rsv);
551 goto fail_free;
552 }
553 trans->block_rsv = &block_rsv;
554 trans->bytes_reserved = block_rsv.size;
555
556 ret = btrfs_qgroup_inherit(trans, 0, objectid, inherit);
557 if (ret)
558 goto fail;
559
560 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
561 BTRFS_NESTING_NORMAL);
562 if (IS_ERR(leaf)) {
563 ret = PTR_ERR(leaf);
564 goto fail;
565 }
566
567 btrfs_mark_buffer_dirty(leaf);
568
569 inode_item = &root_item->inode;
570 btrfs_set_stack_inode_generation(inode_item, 1);
571 btrfs_set_stack_inode_size(inode_item, 3);
572 btrfs_set_stack_inode_nlink(inode_item, 1);
573 btrfs_set_stack_inode_nbytes(inode_item,
574 fs_info->nodesize);
575 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
576
577 btrfs_set_root_flags(root_item, 0);
578 btrfs_set_root_limit(root_item, 0);
579 btrfs_set_stack_inode_flags(inode_item, BTRFS_INODE_ROOT_ITEM_INIT);
580
581 btrfs_set_root_bytenr(root_item, leaf->start);
582 btrfs_set_root_generation(root_item, trans->transid);
583 btrfs_set_root_level(root_item, 0);
584 btrfs_set_root_refs(root_item, 1);
585 btrfs_set_root_used(root_item, leaf->len);
586 btrfs_set_root_last_snapshot(root_item, 0);
587
588 btrfs_set_root_generation_v2(root_item,
589 btrfs_root_generation(root_item));
590 generate_random_guid(root_item->uuid);
591 btrfs_set_stack_timespec_sec(&root_item->otime, cur_time.tv_sec);
592 btrfs_set_stack_timespec_nsec(&root_item->otime, cur_time.tv_nsec);
593 root_item->ctime = root_item->otime;
594 btrfs_set_root_ctransid(root_item, trans->transid);
595 btrfs_set_root_otransid(root_item, trans->transid);
596
597 btrfs_tree_unlock(leaf);
598
599 btrfs_set_root_dirid(root_item, BTRFS_FIRST_FREE_OBJECTID);
600
601 key.objectid = objectid;
602 key.offset = 0;
603 key.type = BTRFS_ROOT_ITEM_KEY;
604 ret = btrfs_insert_root(trans, fs_info->tree_root, &key,
605 root_item);
606 if (ret) {
607
608
609
610
611
612
613
614
615 btrfs_free_tree_block(trans, root, leaf, 0, 1);
616 free_extent_buffer(leaf);
617 goto fail;
618 }
619
620 free_extent_buffer(leaf);
621 leaf = NULL;
622
623 key.offset = (u64)-1;
624 new_root = btrfs_get_new_fs_root(fs_info, objectid, anon_dev);
625 if (IS_ERR(new_root)) {
626 free_anon_bdev(anon_dev);
627 ret = PTR_ERR(new_root);
628 btrfs_abort_transaction(trans, ret);
629 goto fail;
630 }
631
632 anon_dev = 0;
633
634 ret = btrfs_record_root_in_trans(trans, new_root);
635 if (ret) {
636 btrfs_put_root(new_root);
637 btrfs_abort_transaction(trans, ret);
638 goto fail;
639 }
640
641 ret = btrfs_create_subvol_root(trans, new_root, root);
642 btrfs_put_root(new_root);
643 if (ret) {
644
645 btrfs_abort_transaction(trans, ret);
646 goto fail;
647 }
648
649
650
651
652 ret = btrfs_set_inode_index(BTRFS_I(dir), &index);
653 if (ret) {
654 btrfs_abort_transaction(trans, ret);
655 goto fail;
656 }
657
658 ret = btrfs_insert_dir_item(trans, name, namelen, BTRFS_I(dir), &key,
659 BTRFS_FT_DIR, index);
660 if (ret) {
661 btrfs_abort_transaction(trans, ret);
662 goto fail;
663 }
664
665 btrfs_i_size_write(BTRFS_I(dir), dir->i_size + namelen * 2);
666 ret = btrfs_update_inode(trans, root, BTRFS_I(dir));
667 if (ret) {
668 btrfs_abort_transaction(trans, ret);
669 goto fail;
670 }
671
672 ret = btrfs_add_root_ref(trans, objectid, root->root_key.objectid,
673 btrfs_ino(BTRFS_I(dir)), index, name, namelen);
674 if (ret) {
675 btrfs_abort_transaction(trans, ret);
676 goto fail;
677 }
678
679 ret = btrfs_uuid_tree_add(trans, root_item->uuid,
680 BTRFS_UUID_KEY_SUBVOL, objectid);
681 if (ret)
682 btrfs_abort_transaction(trans, ret);
683
684fail:
685 kfree(root_item);
686 trans->block_rsv = NULL;
687 trans->bytes_reserved = 0;
688 btrfs_subvolume_release_metadata(root, &block_rsv);
689
690 err = btrfs_commit_transaction(trans);
691 if (err && !ret)
692 ret = err;
693
694 if (!ret) {
695 inode = btrfs_lookup_dentry(dir, dentry);
696 if (IS_ERR(inode))
697 return PTR_ERR(inode);
698 d_instantiate(dentry, inode);
699 }
700 return ret;
701
702fail_free:
703 if (anon_dev)
704 free_anon_bdev(anon_dev);
705 kfree(root_item);
706 return ret;
707}
708
709static int create_snapshot(struct btrfs_root *root, struct inode *dir,
710 struct dentry *dentry, bool readonly,
711 struct btrfs_qgroup_inherit *inherit)
712{
713 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
714 struct inode *inode;
715 struct btrfs_pending_snapshot *pending_snapshot;
716 struct btrfs_trans_handle *trans;
717 int ret;
718
719 if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
720 return -EINVAL;
721
722 if (atomic_read(&root->nr_swapfiles)) {
723 btrfs_warn(fs_info,
724 "cannot snapshot subvolume with active swapfile");
725 return -ETXTBSY;
726 }
727
728 pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_KERNEL);
729 if (!pending_snapshot)
730 return -ENOMEM;
731
732 ret = get_anon_bdev(&pending_snapshot->anon_dev);
733 if (ret < 0)
734 goto free_pending;
735 pending_snapshot->root_item = kzalloc(sizeof(struct btrfs_root_item),
736 GFP_KERNEL);
737 pending_snapshot->path = btrfs_alloc_path();
738 if (!pending_snapshot->root_item || !pending_snapshot->path) {
739 ret = -ENOMEM;
740 goto free_pending;
741 }
742
743 btrfs_init_block_rsv(&pending_snapshot->block_rsv,
744 BTRFS_BLOCK_RSV_TEMP);
745
746
747
748
749
750
751
752
753 ret = btrfs_subvolume_reserve_metadata(BTRFS_I(dir)->root,
754 &pending_snapshot->block_rsv, 8,
755 false);
756 if (ret)
757 goto free_pending;
758
759 pending_snapshot->dentry = dentry;
760 pending_snapshot->root = root;
761 pending_snapshot->readonly = readonly;
762 pending_snapshot->dir = dir;
763 pending_snapshot->inherit = inherit;
764
765 trans = btrfs_start_transaction(root, 0);
766 if (IS_ERR(trans)) {
767 ret = PTR_ERR(trans);
768 goto fail;
769 }
770
771 spin_lock(&fs_info->trans_lock);
772 list_add(&pending_snapshot->list,
773 &trans->transaction->pending_snapshots);
774 spin_unlock(&fs_info->trans_lock);
775
776 ret = btrfs_commit_transaction(trans);
777 if (ret)
778 goto fail;
779
780 ret = pending_snapshot->error;
781 if (ret)
782 goto fail;
783
784 ret = btrfs_orphan_cleanup(pending_snapshot->snap);
785 if (ret)
786 goto fail;
787
788 inode = btrfs_lookup_dentry(d_inode(dentry->d_parent), dentry);
789 if (IS_ERR(inode)) {
790 ret = PTR_ERR(inode);
791 goto fail;
792 }
793
794 d_instantiate(dentry, inode);
795 ret = 0;
796 pending_snapshot->anon_dev = 0;
797fail:
798
799 if (ret && pending_snapshot->snap)
800 pending_snapshot->snap->anon_dev = 0;
801 btrfs_put_root(pending_snapshot->snap);
802 btrfs_subvolume_release_metadata(root, &pending_snapshot->block_rsv);
803free_pending:
804 if (pending_snapshot->anon_dev)
805 free_anon_bdev(pending_snapshot->anon_dev);
806 kfree(pending_snapshot->root_item);
807 btrfs_free_path(pending_snapshot->path);
808 kfree(pending_snapshot);
809
810 return ret;
811}
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
834{
835 int error;
836
837 if (d_really_is_negative(victim))
838 return -ENOENT;
839
840 BUG_ON(d_inode(victim->d_parent) != dir);
841 audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
842
843 error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
844 if (error)
845 return error;
846 if (IS_APPEND(dir))
847 return -EPERM;
848 if (check_sticky(&init_user_ns, dir, d_inode(victim)) ||
849 IS_APPEND(d_inode(victim)) || IS_IMMUTABLE(d_inode(victim)) ||
850 IS_SWAPFILE(d_inode(victim)))
851 return -EPERM;
852 if (isdir) {
853 if (!d_is_dir(victim))
854 return -ENOTDIR;
855 if (IS_ROOT(victim))
856 return -EBUSY;
857 } else if (d_is_dir(victim))
858 return -EISDIR;
859 if (IS_DEADDIR(dir))
860 return -ENOENT;
861 if (victim->d_flags & DCACHE_NFSFS_RENAMED)
862 return -EBUSY;
863 return 0;
864}
865
866
867static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
868{
869 if (d_really_is_positive(child))
870 return -EEXIST;
871 if (IS_DEADDIR(dir))
872 return -ENOENT;
873 return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
874}
875
876
877
878
879
880
881static noinline int btrfs_mksubvol(const struct path *parent,
882 const char *name, int namelen,
883 struct btrfs_root *snap_src,
884 bool readonly,
885 struct btrfs_qgroup_inherit *inherit)
886{
887 struct inode *dir = d_inode(parent->dentry);
888 struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
889 struct dentry *dentry;
890 int error;
891
892 error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
893 if (error == -EINTR)
894 return error;
895
896 dentry = lookup_one_len(name, parent->dentry, namelen);
897 error = PTR_ERR(dentry);
898 if (IS_ERR(dentry))
899 goto out_unlock;
900
901 error = btrfs_may_create(dir, dentry);
902 if (error)
903 goto out_dput;
904
905
906
907
908
909 error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
910 dir->i_ino, name,
911 namelen);
912 if (error)
913 goto out_dput;
914
915 down_read(&fs_info->subvol_sem);
916
917 if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0)
918 goto out_up_read;
919
920 if (snap_src)
921 error = create_snapshot(snap_src, dir, dentry, readonly, inherit);
922 else
923 error = create_subvol(dir, dentry, name, namelen, inherit);
924
925 if (!error)
926 fsnotify_mkdir(dir, dentry);
927out_up_read:
928 up_read(&fs_info->subvol_sem);
929out_dput:
930 dput(dentry);
931out_unlock:
932 btrfs_inode_unlock(dir, 0);
933 return error;
934}
935
936static noinline int btrfs_mksnapshot(const struct path *parent,
937 const char *name, int namelen,
938 struct btrfs_root *root,
939 bool readonly,
940 struct btrfs_qgroup_inherit *inherit)
941{
942 int ret;
943 bool snapshot_force_cow = false;
944
945
946
947
948
949
950 btrfs_drew_read_lock(&root->snapshot_lock);
951
952 ret = btrfs_start_delalloc_snapshot(root, false);
953 if (ret)
954 goto out;
955
956
957
958
959
960
961 atomic_inc(&root->snapshot_force_cow);
962 snapshot_force_cow = true;
963
964 btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
965
966 ret = btrfs_mksubvol(parent, name, namelen,
967 root, readonly, inherit);
968out:
969 if (snapshot_force_cow)
970 atomic_dec(&root->snapshot_force_cow);
971 btrfs_drew_read_unlock(&root->snapshot_lock);
972 return ret;
973}
974
975
976
977
978
979
980
981
982static int check_defrag_in_cache(struct inode *inode, u64 offset, u32 thresh)
983{
984 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
985 struct extent_map *em = NULL;
986 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
987 u64 end;
988
989 read_lock(&em_tree->lock);
990 em = lookup_extent_mapping(em_tree, offset, PAGE_SIZE);
991 read_unlock(&em_tree->lock);
992
993 if (em) {
994 end = extent_map_end(em);
995 free_extent_map(em);
996 if (end - offset > thresh)
997 return 0;
998 }
999
1000 thresh /= 2;
1001 end = count_range_bits(io_tree, &offset, offset + thresh,
1002 thresh, EXTENT_DELALLOC, 1);
1003 if (end >= thresh)
1004 return 0;
1005 return 1;
1006}
1007
1008
1009
1010
1011
1012
1013
1014
1015static int find_new_extents(struct btrfs_root *root,
1016 struct inode *inode, u64 newer_than,
1017 u64 *off, u32 thresh)
1018{
1019 struct btrfs_path *path;
1020 struct btrfs_key min_key;
1021 struct extent_buffer *leaf;
1022 struct btrfs_file_extent_item *extent;
1023 int type;
1024 int ret;
1025 u64 ino = btrfs_ino(BTRFS_I(inode));
1026
1027 path = btrfs_alloc_path();
1028 if (!path)
1029 return -ENOMEM;
1030
1031 min_key.objectid = ino;
1032 min_key.type = BTRFS_EXTENT_DATA_KEY;
1033 min_key.offset = *off;
1034
1035 while (1) {
1036 ret = btrfs_search_forward(root, &min_key, path, newer_than);
1037 if (ret != 0)
1038 goto none;
1039process_slot:
1040 if (min_key.objectid != ino)
1041 goto none;
1042 if (min_key.type != BTRFS_EXTENT_DATA_KEY)
1043 goto none;
1044
1045 leaf = path->nodes[0];
1046 extent = btrfs_item_ptr(leaf, path->slots[0],
1047 struct btrfs_file_extent_item);
1048
1049 type = btrfs_file_extent_type(leaf, extent);
1050 if (type == BTRFS_FILE_EXTENT_REG &&
1051 btrfs_file_extent_num_bytes(leaf, extent) < thresh &&
1052 check_defrag_in_cache(inode, min_key.offset, thresh)) {
1053 *off = min_key.offset;
1054 btrfs_free_path(path);
1055 return 0;
1056 }
1057
1058 path->slots[0]++;
1059 if (path->slots[0] < btrfs_header_nritems(leaf)) {
1060 btrfs_item_key_to_cpu(leaf, &min_key, path->slots[0]);
1061 goto process_slot;
1062 }
1063
1064 if (min_key.offset == (u64)-1)
1065 goto none;
1066
1067 min_key.offset++;
1068 btrfs_release_path(path);
1069 }
1070none:
1071 btrfs_free_path(path);
1072 return -ENOENT;
1073}
1074
1075static struct extent_map *defrag_lookup_extent(struct inode *inode, u64 start)
1076{
1077 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1078 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1079 struct extent_map *em;
1080 u64 len = PAGE_SIZE;
1081
1082
1083
1084
1085
1086 read_lock(&em_tree->lock);
1087 em = lookup_extent_mapping(em_tree, start, len);
1088 read_unlock(&em_tree->lock);
1089
1090 if (!em) {
1091 struct extent_state *cached = NULL;
1092 u64 end = start + len - 1;
1093
1094
1095 lock_extent_bits(io_tree, start, end, &cached);
1096 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, start, len);
1097 unlock_extent_cached(io_tree, start, end, &cached);
1098
1099 if (IS_ERR(em))
1100 return NULL;
1101 }
1102
1103 return em;
1104}
1105
1106static bool defrag_check_next_extent(struct inode *inode, struct extent_map *em)
1107{
1108 struct extent_map *next;
1109 bool ret = true;
1110
1111
1112 if (em->start + em->len >= i_size_read(inode))
1113 return false;
1114
1115 next = defrag_lookup_extent(inode, em->start + em->len);
1116 if (!next || next->block_start >= EXTENT_MAP_LAST_BYTE)
1117 ret = false;
1118 else if ((em->block_start + em->block_len == next->block_start) &&
1119 (em->block_len > SZ_128K && next->block_len > SZ_128K))
1120 ret = false;
1121
1122 free_extent_map(next);
1123 return ret;
1124}
1125
1126static int should_defrag_range(struct inode *inode, u64 start, u32 thresh,
1127 u64 *last_len, u64 *skip, u64 *defrag_end,
1128 int compress)
1129{
1130 struct extent_map *em;
1131 int ret = 1;
1132 bool next_mergeable = true;
1133 bool prev_mergeable = true;
1134
1135
1136
1137
1138
1139 if (start < *defrag_end)
1140 return 1;
1141
1142 *skip = 0;
1143
1144 em = defrag_lookup_extent(inode, start);
1145 if (!em)
1146 return 0;
1147
1148
1149 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1150 ret = 0;
1151 goto out;
1152 }
1153
1154 if (!*defrag_end)
1155 prev_mergeable = false;
1156
1157 next_mergeable = defrag_check_next_extent(inode, em);
1158
1159
1160
1161
1162 if (!compress && (*last_len == 0 || *last_len >= thresh) &&
1163 (em->len >= thresh || (!next_mergeable && !prev_mergeable)))
1164 ret = 0;
1165out:
1166
1167
1168
1169
1170
1171
1172
1173
1174 if (ret) {
1175 *defrag_end = extent_map_end(em);
1176 } else {
1177 *last_len = 0;
1178 *skip = extent_map_end(em);
1179 *defrag_end = 0;
1180 }
1181
1182 free_extent_map(em);
1183 return ret;
1184}
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198static int cluster_pages_for_defrag(struct inode *inode,
1199 struct page **pages,
1200 unsigned long start_index,
1201 unsigned long num_pages)
1202{
1203 unsigned long file_end;
1204 u64 isize = i_size_read(inode);
1205 u64 page_start;
1206 u64 page_end;
1207 u64 page_cnt;
1208 u64 start = (u64)start_index << PAGE_SHIFT;
1209 u64 search_start;
1210 int ret;
1211 int i;
1212 int i_done;
1213 struct btrfs_ordered_extent *ordered;
1214 struct extent_state *cached_state = NULL;
1215 struct extent_io_tree *tree;
1216 struct extent_changeset *data_reserved = NULL;
1217 gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
1218
1219 file_end = (isize - 1) >> PAGE_SHIFT;
1220 if (!isize || start_index > file_end)
1221 return 0;
1222
1223 page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
1224
1225 ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved,
1226 start, page_cnt << PAGE_SHIFT);
1227 if (ret)
1228 return ret;
1229 i_done = 0;
1230 tree = &BTRFS_I(inode)->io_tree;
1231
1232
1233 for (i = 0; i < page_cnt; i++) {
1234 struct page *page;
1235again:
1236 page = find_or_create_page(inode->i_mapping,
1237 start_index + i, mask);
1238 if (!page)
1239 break;
1240
1241 ret = set_page_extent_mapped(page);
1242 if (ret < 0) {
1243 unlock_page(page);
1244 put_page(page);
1245 break;
1246 }
1247
1248 page_start = page_offset(page);
1249 page_end = page_start + PAGE_SIZE - 1;
1250 while (1) {
1251 lock_extent_bits(tree, page_start, page_end,
1252 &cached_state);
1253 ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode),
1254 page_start);
1255 unlock_extent_cached(tree, page_start, page_end,
1256 &cached_state);
1257 if (!ordered)
1258 break;
1259
1260 unlock_page(page);
1261 btrfs_start_ordered_extent(ordered, 1);
1262 btrfs_put_ordered_extent(ordered);
1263 lock_page(page);
1264
1265
1266
1267
1268 if (page->mapping != inode->i_mapping) {
1269 unlock_page(page);
1270 put_page(page);
1271 goto again;
1272 }
1273 }
1274
1275 if (!PageUptodate(page)) {
1276 btrfs_readpage(NULL, page);
1277 lock_page(page);
1278 if (!PageUptodate(page)) {
1279 unlock_page(page);
1280 put_page(page);
1281 ret = -EIO;
1282 break;
1283 }
1284 }
1285
1286 if (page->mapping != inode->i_mapping) {
1287 unlock_page(page);
1288 put_page(page);
1289 goto again;
1290 }
1291
1292 pages[i] = page;
1293 i_done++;
1294 }
1295 if (!i_done || ret)
1296 goto out;
1297
1298 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1299 goto out;
1300
1301
1302
1303
1304
1305 for (i = 0; i < i_done; i++)
1306 wait_on_page_writeback(pages[i]);
1307
1308 page_start = page_offset(pages[0]);
1309 page_end = page_offset(pages[i_done - 1]) + PAGE_SIZE;
1310
1311 lock_extent_bits(&BTRFS_I(inode)->io_tree,
1312 page_start, page_end - 1, &cached_state);
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327 search_start = page_start;
1328 while (search_start < page_end) {
1329 struct extent_map *em;
1330
1331 em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, search_start,
1332 page_end - search_start);
1333 if (IS_ERR(em)) {
1334 ret = PTR_ERR(em);
1335 goto out_unlock_range;
1336 }
1337 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1338 free_extent_map(em);
1339
1340 ret = 0;
1341 goto out_unlock_range;
1342 }
1343 search_start = extent_map_end(em);
1344 free_extent_map(em);
1345 }
1346
1347 clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
1348 page_end - 1, EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING |
1349 EXTENT_DEFRAG, 0, 0, &cached_state);
1350
1351 if (i_done != page_cnt) {
1352 spin_lock(&BTRFS_I(inode)->lock);
1353 btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
1354 spin_unlock(&BTRFS_I(inode)->lock);
1355 btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved,
1356 start, (page_cnt - i_done) << PAGE_SHIFT, true);
1357 }
1358
1359
1360 set_extent_defrag(&BTRFS_I(inode)->io_tree, page_start, page_end - 1,
1361 &cached_state);
1362
1363 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1364 page_start, page_end - 1, &cached_state);
1365
1366 for (i = 0; i < i_done; i++) {
1367 clear_page_dirty_for_io(pages[i]);
1368 ClearPageChecked(pages[i]);
1369 set_page_dirty(pages[i]);
1370 unlock_page(pages[i]);
1371 put_page(pages[i]);
1372 }
1373 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
1374 extent_changeset_free(data_reserved);
1375 return i_done;
1376
1377out_unlock_range:
1378 unlock_extent_cached(&BTRFS_I(inode)->io_tree,
1379 page_start, page_end - 1, &cached_state);
1380out:
1381 for (i = 0; i < i_done; i++) {
1382 unlock_page(pages[i]);
1383 put_page(pages[i]);
1384 }
1385 btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved,
1386 start, page_cnt << PAGE_SHIFT, true);
1387 btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
1388 extent_changeset_free(data_reserved);
1389 return ret;
1390
1391}
1392
1393int btrfs_defrag_file(struct inode *inode, struct file *file,
1394 struct btrfs_ioctl_defrag_range_args *range,
1395 u64 newer_than, unsigned long max_to_defrag)
1396{
1397 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1398 struct btrfs_root *root = BTRFS_I(inode)->root;
1399 struct file_ra_state *ra = NULL;
1400 unsigned long last_index;
1401 u64 isize = i_size_read(inode);
1402 u64 last_len = 0;
1403 u64 skip = 0;
1404 u64 defrag_end = 0;
1405 u64 newer_off = range->start;
1406 unsigned long i;
1407 unsigned long ra_index = 0;
1408 int ret;
1409 int defrag_count = 0;
1410 int compress_type = BTRFS_COMPRESS_ZLIB;
1411 u32 extent_thresh = range->extent_thresh;
1412 unsigned long max_cluster = SZ_256K >> PAGE_SHIFT;
1413 unsigned long cluster = max_cluster;
1414 u64 new_align = ~((u64)SZ_128K - 1);
1415 struct page **pages = NULL;
1416 bool do_compress = range->flags & BTRFS_DEFRAG_RANGE_COMPRESS;
1417
1418 if (isize == 0)
1419 return 0;
1420
1421 if (range->start >= isize)
1422 return -EINVAL;
1423
1424 if (do_compress) {
1425 if (range->compress_type >= BTRFS_NR_COMPRESS_TYPES)
1426 return -EINVAL;
1427 if (range->compress_type)
1428 compress_type = range->compress_type;
1429 }
1430
1431 if (extent_thresh == 0)
1432 extent_thresh = SZ_256K;
1433
1434
1435
1436
1437
1438
1439 if (!file) {
1440 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1441 if (ra)
1442 file_ra_state_init(ra, inode->i_mapping);
1443 } else {
1444 ra = &file->f_ra;
1445 }
1446
1447 pages = kmalloc_array(max_cluster, sizeof(struct page *), GFP_KERNEL);
1448 if (!pages) {
1449 ret = -ENOMEM;
1450 goto out_ra;
1451 }
1452
1453
1454 if (range->start + range->len > range->start) {
1455 last_index = min_t(u64, isize - 1,
1456 range->start + range->len - 1) >> PAGE_SHIFT;
1457 } else {
1458 last_index = (isize - 1) >> PAGE_SHIFT;
1459 }
1460
1461 if (newer_than) {
1462 ret = find_new_extents(root, inode, newer_than,
1463 &newer_off, SZ_64K);
1464 if (!ret) {
1465 range->start = newer_off;
1466
1467
1468
1469
1470 i = (newer_off & new_align) >> PAGE_SHIFT;
1471 } else
1472 goto out_ra;
1473 } else {
1474 i = range->start >> PAGE_SHIFT;
1475 }
1476 if (!max_to_defrag)
1477 max_to_defrag = last_index - i + 1;
1478
1479
1480
1481
1482
1483 if (i < inode->i_mapping->writeback_index)
1484 inode->i_mapping->writeback_index = i;
1485
1486 while (i <= last_index && defrag_count < max_to_defrag &&
1487 (i < DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE))) {
1488
1489
1490
1491
1492 if (!(inode->i_sb->s_flags & SB_ACTIVE))
1493 break;
1494
1495 if (btrfs_defrag_cancelled(fs_info)) {
1496 btrfs_debug(fs_info, "defrag_file cancelled");
1497 ret = -EAGAIN;
1498 goto error;
1499 }
1500
1501 if (!should_defrag_range(inode, (u64)i << PAGE_SHIFT,
1502 extent_thresh, &last_len, &skip,
1503 &defrag_end, do_compress)){
1504 unsigned long next;
1505
1506
1507
1508
1509 next = DIV_ROUND_UP(skip, PAGE_SIZE);
1510 i = max(i + 1, next);
1511 continue;
1512 }
1513
1514 if (!newer_than) {
1515 cluster = (PAGE_ALIGN(defrag_end) >>
1516 PAGE_SHIFT) - i;
1517 cluster = min(cluster, max_cluster);
1518 } else {
1519 cluster = max_cluster;
1520 }
1521
1522 if (i + cluster > ra_index) {
1523 ra_index = max(i, ra_index);
1524 if (ra)
1525 page_cache_sync_readahead(inode->i_mapping, ra,
1526 file, ra_index, cluster);
1527 ra_index += cluster;
1528 }
1529
1530 btrfs_inode_lock(inode, 0);
1531 if (IS_SWAPFILE(inode)) {
1532 ret = -ETXTBSY;
1533 } else {
1534 if (do_compress)
1535 BTRFS_I(inode)->defrag_compress = compress_type;
1536 ret = cluster_pages_for_defrag(inode, pages, i, cluster);
1537 }
1538 if (ret < 0) {
1539 btrfs_inode_unlock(inode, 0);
1540 goto out_ra;
1541 }
1542
1543 defrag_count += ret;
1544 balance_dirty_pages_ratelimited(inode->i_mapping);
1545 btrfs_inode_unlock(inode, 0);
1546
1547 if (newer_than) {
1548 if (newer_off == (u64)-1)
1549 break;
1550
1551 if (ret > 0)
1552 i += ret;
1553
1554 newer_off = max(newer_off + 1,
1555 (u64)i << PAGE_SHIFT);
1556
1557 ret = find_new_extents(root, inode, newer_than,
1558 &newer_off, SZ_64K);
1559 if (!ret) {
1560 range->start = newer_off;
1561 i = (newer_off & new_align) >> PAGE_SHIFT;
1562 } else {
1563 break;
1564 }
1565 } else {
1566 if (ret > 0) {
1567 i += ret;
1568 last_len += ret << PAGE_SHIFT;
1569 } else {
1570 i++;
1571 last_len = 0;
1572 }
1573 }
1574 }
1575
1576 ret = defrag_count;
1577error:
1578 if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) {
1579 filemap_flush(inode->i_mapping);
1580 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
1581 &BTRFS_I(inode)->runtime_flags))
1582 filemap_flush(inode->i_mapping);
1583 }
1584
1585 if (range->compress_type == BTRFS_COMPRESS_LZO) {
1586 btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
1587 } else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
1588 btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
1589 }
1590
1591out_ra:
1592 if (do_compress) {
1593 btrfs_inode_lock(inode, 0);
1594 BTRFS_I(inode)->defrag_compress = BTRFS_COMPRESS_NONE;
1595 btrfs_inode_unlock(inode, 0);
1596 }
1597 if (!file)
1598 kfree(ra);
1599 kfree(pages);
1600 return ret;
1601}
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613static int exclop_start_or_cancel_reloc(struct btrfs_fs_info *fs_info,
1614 enum btrfs_exclusive_operation type, bool cancel)
1615{
1616 if (!cancel) {
1617
1618 if (!btrfs_exclop_start(fs_info, type))
1619 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
1620
1621 return 0;
1622 }
1623
1624
1625 if (btrfs_exclop_start_try_lock(fs_info, type)) {
1626
1627
1628
1629
1630
1631 atomic_inc(&fs_info->reloc_cancel_req);
1632 btrfs_exclop_start_unlock(fs_info);
1633
1634 if (test_bit(BTRFS_FS_RELOC_RUNNING, &fs_info->flags))
1635 wait_on_bit(&fs_info->flags, BTRFS_FS_RELOC_RUNNING,
1636 TASK_INTERRUPTIBLE);
1637
1638 return -ECANCELED;
1639 }
1640
1641
1642 return -ENOTCONN;
1643}
1644
1645static noinline int btrfs_ioctl_resize(struct file *file,
1646 void __user *arg)
1647{
1648 struct inode *inode = file_inode(file);
1649 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1650 u64 new_size;
1651 u64 old_size;
1652 u64 devid = 1;
1653 struct btrfs_root *root = BTRFS_I(inode)->root;
1654 struct btrfs_ioctl_vol_args *vol_args;
1655 struct btrfs_trans_handle *trans;
1656 struct btrfs_device *device = NULL;
1657 char *sizestr;
1658 char *retptr;
1659 char *devstr = NULL;
1660 int ret = 0;
1661 int mod = 0;
1662 bool cancel;
1663
1664 if (!capable(CAP_SYS_ADMIN))
1665 return -EPERM;
1666
1667 ret = mnt_want_write_file(file);
1668 if (ret)
1669 return ret;
1670
1671
1672
1673
1674
1675 vol_args = memdup_user(arg, sizeof(*vol_args));
1676 if (IS_ERR(vol_args)) {
1677 ret = PTR_ERR(vol_args);
1678 goto out_drop;
1679 }
1680 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1681 sizestr = vol_args->name;
1682 cancel = (strcmp("cancel", sizestr) == 0);
1683 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_RESIZE, cancel);
1684 if (ret)
1685 goto out_free;
1686
1687
1688 devstr = strchr(sizestr, ':');
1689 if (devstr) {
1690 sizestr = devstr + 1;
1691 *devstr = '\0';
1692 devstr = vol_args->name;
1693 ret = kstrtoull(devstr, 10, &devid);
1694 if (ret)
1695 goto out_finish;
1696 if (!devid) {
1697 ret = -EINVAL;
1698 goto out_finish;
1699 }
1700 btrfs_info(fs_info, "resizing devid %llu", devid);
1701 }
1702
1703 device = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL);
1704 if (!device) {
1705 btrfs_info(fs_info, "resizer unable to find device %llu",
1706 devid);
1707 ret = -ENODEV;
1708 goto out_finish;
1709 }
1710
1711 if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state)) {
1712 btrfs_info(fs_info,
1713 "resizer unable to apply on readonly device %llu",
1714 devid);
1715 ret = -EPERM;
1716 goto out_finish;
1717 }
1718
1719 if (!strcmp(sizestr, "max"))
1720 new_size = device->bdev->bd_inode->i_size;
1721 else {
1722 if (sizestr[0] == '-') {
1723 mod = -1;
1724 sizestr++;
1725 } else if (sizestr[0] == '+') {
1726 mod = 1;
1727 sizestr++;
1728 }
1729 new_size = memparse(sizestr, &retptr);
1730 if (*retptr != '\0' || new_size == 0) {
1731 ret = -EINVAL;
1732 goto out_finish;
1733 }
1734 }
1735
1736 if (test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) {
1737 ret = -EPERM;
1738 goto out_finish;
1739 }
1740
1741 old_size = btrfs_device_get_total_bytes(device);
1742
1743 if (mod < 0) {
1744 if (new_size > old_size) {
1745 ret = -EINVAL;
1746 goto out_finish;
1747 }
1748 new_size = old_size - new_size;
1749 } else if (mod > 0) {
1750 if (new_size > ULLONG_MAX - old_size) {
1751 ret = -ERANGE;
1752 goto out_finish;
1753 }
1754 new_size = old_size + new_size;
1755 }
1756
1757 if (new_size < SZ_256M) {
1758 ret = -EINVAL;
1759 goto out_finish;
1760 }
1761 if (new_size > device->bdev->bd_inode->i_size) {
1762 ret = -EFBIG;
1763 goto out_finish;
1764 }
1765
1766 new_size = round_down(new_size, fs_info->sectorsize);
1767
1768 if (new_size > old_size) {
1769 trans = btrfs_start_transaction(root, 0);
1770 if (IS_ERR(trans)) {
1771 ret = PTR_ERR(trans);
1772 goto out_finish;
1773 }
1774 ret = btrfs_grow_device(trans, device, new_size);
1775 btrfs_commit_transaction(trans);
1776 } else if (new_size < old_size) {
1777 ret = btrfs_shrink_device(device, new_size);
1778 }
1779
1780 if (ret == 0 && new_size != old_size)
1781 btrfs_info_in_rcu(fs_info,
1782 "resize device %s (devid %llu) from %llu to %llu",
1783 rcu_str_deref(device->name), device->devid,
1784 old_size, new_size);
1785out_finish:
1786 btrfs_exclop_finish(fs_info);
1787out_free:
1788 kfree(vol_args);
1789out_drop:
1790 mnt_drop_write_file(file);
1791 return ret;
1792}
1793
1794static noinline int __btrfs_ioctl_snap_create(struct file *file,
1795 const char *name, unsigned long fd, int subvol,
1796 bool readonly,
1797 struct btrfs_qgroup_inherit *inherit)
1798{
1799 int namelen;
1800 int ret = 0;
1801
1802 if (!S_ISDIR(file_inode(file)->i_mode))
1803 return -ENOTDIR;
1804
1805 ret = mnt_want_write_file(file);
1806 if (ret)
1807 goto out;
1808
1809 namelen = strlen(name);
1810 if (strchr(name, '/')) {
1811 ret = -EINVAL;
1812 goto out_drop_write;
1813 }
1814
1815 if (name[0] == '.' &&
1816 (namelen == 1 || (name[1] == '.' && namelen == 2))) {
1817 ret = -EEXIST;
1818 goto out_drop_write;
1819 }
1820
1821 if (subvol) {
1822 ret = btrfs_mksubvol(&file->f_path, name, namelen,
1823 NULL, readonly, inherit);
1824 } else {
1825 struct fd src = fdget(fd);
1826 struct inode *src_inode;
1827 if (!src.file) {
1828 ret = -EINVAL;
1829 goto out_drop_write;
1830 }
1831
1832 src_inode = file_inode(src.file);
1833 if (src_inode->i_sb != file_inode(file)->i_sb) {
1834 btrfs_info(BTRFS_I(file_inode(file))->root->fs_info,
1835 "Snapshot src from another FS");
1836 ret = -EXDEV;
1837 } else if (!inode_owner_or_capable(&init_user_ns, src_inode)) {
1838
1839
1840
1841
1842 ret = -EPERM;
1843 } else {
1844 ret = btrfs_mksnapshot(&file->f_path, name, namelen,
1845 BTRFS_I(src_inode)->root,
1846 readonly, inherit);
1847 }
1848 fdput(src);
1849 }
1850out_drop_write:
1851 mnt_drop_write_file(file);
1852out:
1853 return ret;
1854}
1855
1856static noinline int btrfs_ioctl_snap_create(struct file *file,
1857 void __user *arg, int subvol)
1858{
1859 struct btrfs_ioctl_vol_args *vol_args;
1860 int ret;
1861
1862 if (!S_ISDIR(file_inode(file)->i_mode))
1863 return -ENOTDIR;
1864
1865 vol_args = memdup_user(arg, sizeof(*vol_args));
1866 if (IS_ERR(vol_args))
1867 return PTR_ERR(vol_args);
1868 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
1869
1870 ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd,
1871 subvol, false, NULL);
1872
1873 kfree(vol_args);
1874 return ret;
1875}
1876
1877static noinline int btrfs_ioctl_snap_create_v2(struct file *file,
1878 void __user *arg, int subvol)
1879{
1880 struct btrfs_ioctl_vol_args_v2 *vol_args;
1881 int ret;
1882 bool readonly = false;
1883 struct btrfs_qgroup_inherit *inherit = NULL;
1884
1885 if (!S_ISDIR(file_inode(file)->i_mode))
1886 return -ENOTDIR;
1887
1888 vol_args = memdup_user(arg, sizeof(*vol_args));
1889 if (IS_ERR(vol_args))
1890 return PTR_ERR(vol_args);
1891 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
1892
1893 if (vol_args->flags & ~BTRFS_SUBVOL_CREATE_ARGS_MASK) {
1894 ret = -EOPNOTSUPP;
1895 goto free_args;
1896 }
1897
1898 if (vol_args->flags & BTRFS_SUBVOL_RDONLY)
1899 readonly = true;
1900 if (vol_args->flags & BTRFS_SUBVOL_QGROUP_INHERIT) {
1901 u64 nums;
1902
1903 if (vol_args->size < sizeof(*inherit) ||
1904 vol_args->size > PAGE_SIZE) {
1905 ret = -EINVAL;
1906 goto free_args;
1907 }
1908 inherit = memdup_user(vol_args->qgroup_inherit, vol_args->size);
1909 if (IS_ERR(inherit)) {
1910 ret = PTR_ERR(inherit);
1911 goto free_args;
1912 }
1913
1914 if (inherit->num_qgroups > PAGE_SIZE ||
1915 inherit->num_ref_copies > PAGE_SIZE ||
1916 inherit->num_excl_copies > PAGE_SIZE) {
1917 ret = -EINVAL;
1918 goto free_inherit;
1919 }
1920
1921 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
1922 2 * inherit->num_excl_copies;
1923 if (vol_args->size != struct_size(inherit, qgroups, nums)) {
1924 ret = -EINVAL;
1925 goto free_inherit;
1926 }
1927 }
1928
1929 ret = __btrfs_ioctl_snap_create(file, vol_args->name, vol_args->fd,
1930 subvol, readonly, inherit);
1931 if (ret)
1932 goto free_inherit;
1933free_inherit:
1934 kfree(inherit);
1935free_args:
1936 kfree(vol_args);
1937 return ret;
1938}
1939
1940static noinline int btrfs_ioctl_subvol_getflags(struct file *file,
1941 void __user *arg)
1942{
1943 struct inode *inode = file_inode(file);
1944 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1945 struct btrfs_root *root = BTRFS_I(inode)->root;
1946 int ret = 0;
1947 u64 flags = 0;
1948
1949 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID)
1950 return -EINVAL;
1951
1952 down_read(&fs_info->subvol_sem);
1953 if (btrfs_root_readonly(root))
1954 flags |= BTRFS_SUBVOL_RDONLY;
1955 up_read(&fs_info->subvol_sem);
1956
1957 if (copy_to_user(arg, &flags, sizeof(flags)))
1958 ret = -EFAULT;
1959
1960 return ret;
1961}
1962
1963static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
1964 void __user *arg)
1965{
1966 struct inode *inode = file_inode(file);
1967 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
1968 struct btrfs_root *root = BTRFS_I(inode)->root;
1969 struct btrfs_trans_handle *trans;
1970 u64 root_flags;
1971 u64 flags;
1972 int ret = 0;
1973
1974 if (!inode_owner_or_capable(&init_user_ns, inode))
1975 return -EPERM;
1976
1977 ret = mnt_want_write_file(file);
1978 if (ret)
1979 goto out;
1980
1981 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
1982 ret = -EINVAL;
1983 goto out_drop_write;
1984 }
1985
1986 if (copy_from_user(&flags, arg, sizeof(flags))) {
1987 ret = -EFAULT;
1988 goto out_drop_write;
1989 }
1990
1991 if (flags & ~BTRFS_SUBVOL_RDONLY) {
1992 ret = -EOPNOTSUPP;
1993 goto out_drop_write;
1994 }
1995
1996 down_write(&fs_info->subvol_sem);
1997
1998
1999 if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root))
2000 goto out_drop_sem;
2001
2002 root_flags = btrfs_root_flags(&root->root_item);
2003 if (flags & BTRFS_SUBVOL_RDONLY) {
2004 btrfs_set_root_flags(&root->root_item,
2005 root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
2006 } else {
2007
2008
2009
2010
2011 spin_lock(&root->root_item_lock);
2012 if (root->send_in_progress == 0) {
2013 btrfs_set_root_flags(&root->root_item,
2014 root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
2015 spin_unlock(&root->root_item_lock);
2016 } else {
2017 spin_unlock(&root->root_item_lock);
2018 btrfs_warn(fs_info,
2019 "Attempt to set subvolume %llu read-write during send",
2020 root->root_key.objectid);
2021 ret = -EPERM;
2022 goto out_drop_sem;
2023 }
2024 }
2025
2026 trans = btrfs_start_transaction(root, 1);
2027 if (IS_ERR(trans)) {
2028 ret = PTR_ERR(trans);
2029 goto out_reset;
2030 }
2031
2032 ret = btrfs_update_root(trans, fs_info->tree_root,
2033 &root->root_key, &root->root_item);
2034 if (ret < 0) {
2035 btrfs_end_transaction(trans);
2036 goto out_reset;
2037 }
2038
2039 ret = btrfs_commit_transaction(trans);
2040
2041out_reset:
2042 if (ret)
2043 btrfs_set_root_flags(&root->root_item, root_flags);
2044out_drop_sem:
2045 up_write(&fs_info->subvol_sem);
2046out_drop_write:
2047 mnt_drop_write_file(file);
2048out:
2049 return ret;
2050}
2051
2052static noinline int key_in_sk(struct btrfs_key *key,
2053 struct btrfs_ioctl_search_key *sk)
2054{
2055 struct btrfs_key test;
2056 int ret;
2057
2058 test.objectid = sk->min_objectid;
2059 test.type = sk->min_type;
2060 test.offset = sk->min_offset;
2061
2062 ret = btrfs_comp_cpu_keys(key, &test);
2063 if (ret < 0)
2064 return 0;
2065
2066 test.objectid = sk->max_objectid;
2067 test.type = sk->max_type;
2068 test.offset = sk->max_offset;
2069
2070 ret = btrfs_comp_cpu_keys(key, &test);
2071 if (ret > 0)
2072 return 0;
2073 return 1;
2074}
2075
2076static noinline int copy_to_sk(struct btrfs_path *path,
2077 struct btrfs_key *key,
2078 struct btrfs_ioctl_search_key *sk,
2079 size_t *buf_size,
2080 char __user *ubuf,
2081 unsigned long *sk_offset,
2082 int *num_found)
2083{
2084 u64 found_transid;
2085 struct extent_buffer *leaf;
2086 struct btrfs_ioctl_search_header sh;
2087 struct btrfs_key test;
2088 unsigned long item_off;
2089 unsigned long item_len;
2090 int nritems;
2091 int i;
2092 int slot;
2093 int ret = 0;
2094
2095 leaf = path->nodes[0];
2096 slot = path->slots[0];
2097 nritems = btrfs_header_nritems(leaf);
2098
2099 if (btrfs_header_generation(leaf) > sk->max_transid) {
2100 i = nritems;
2101 goto advance_key;
2102 }
2103 found_transid = btrfs_header_generation(leaf);
2104
2105 for (i = slot; i < nritems; i++) {
2106 item_off = btrfs_item_ptr_offset(leaf, i);
2107 item_len = btrfs_item_size_nr(leaf, i);
2108
2109 btrfs_item_key_to_cpu(leaf, key, i);
2110 if (!key_in_sk(key, sk))
2111 continue;
2112
2113 if (sizeof(sh) + item_len > *buf_size) {
2114 if (*num_found) {
2115 ret = 1;
2116 goto out;
2117 }
2118
2119
2120
2121
2122
2123
2124 *buf_size = sizeof(sh) + item_len;
2125 item_len = 0;
2126 ret = -EOVERFLOW;
2127 }
2128
2129 if (sizeof(sh) + item_len + *sk_offset > *buf_size) {
2130 ret = 1;
2131 goto out;
2132 }
2133
2134 sh.objectid = key->objectid;
2135 sh.offset = key->offset;
2136 sh.type = key->type;
2137 sh.len = item_len;
2138 sh.transid = found_transid;
2139
2140
2141
2142
2143
2144
2145
2146 if (copy_to_user_nofault(ubuf + *sk_offset, &sh, sizeof(sh))) {
2147 ret = 0;
2148 goto out;
2149 }
2150
2151 *sk_offset += sizeof(sh);
2152
2153 if (item_len) {
2154 char __user *up = ubuf + *sk_offset;
2155
2156
2157
2158
2159 if (read_extent_buffer_to_user_nofault(leaf, up,
2160 item_off, item_len)) {
2161 ret = 0;
2162 *sk_offset -= sizeof(sh);
2163 goto out;
2164 }
2165
2166 *sk_offset += item_len;
2167 }
2168 (*num_found)++;
2169
2170 if (ret)
2171 goto out;
2172
2173 if (*num_found >= sk->nr_items) {
2174 ret = 1;
2175 goto out;
2176 }
2177 }
2178advance_key:
2179 ret = 0;
2180 test.objectid = sk->max_objectid;
2181 test.type = sk->max_type;
2182 test.offset = sk->max_offset;
2183 if (btrfs_comp_cpu_keys(key, &test) >= 0)
2184 ret = 1;
2185 else if (key->offset < (u64)-1)
2186 key->offset++;
2187 else if (key->type < (u8)-1) {
2188 key->offset = 0;
2189 key->type++;
2190 } else if (key->objectid < (u64)-1) {
2191 key->offset = 0;
2192 key->type = 0;
2193 key->objectid++;
2194 } else
2195 ret = 1;
2196out:
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206 return ret;
2207}
2208
2209static noinline int search_ioctl(struct inode *inode,
2210 struct btrfs_ioctl_search_key *sk,
2211 size_t *buf_size,
2212 char __user *ubuf)
2213{
2214 struct btrfs_fs_info *info = btrfs_sb(inode->i_sb);
2215 struct btrfs_root *root;
2216 struct btrfs_key key;
2217 struct btrfs_path *path;
2218 int ret;
2219 int num_found = 0;
2220 unsigned long sk_offset = 0;
2221
2222 if (*buf_size < sizeof(struct btrfs_ioctl_search_header)) {
2223 *buf_size = sizeof(struct btrfs_ioctl_search_header);
2224 return -EOVERFLOW;
2225 }
2226
2227 path = btrfs_alloc_path();
2228 if (!path)
2229 return -ENOMEM;
2230
2231 if (sk->tree_id == 0) {
2232
2233 root = btrfs_grab_root(BTRFS_I(inode)->root);
2234 } else {
2235 root = btrfs_get_fs_root(info, sk->tree_id, true);
2236 if (IS_ERR(root)) {
2237 btrfs_free_path(path);
2238 return PTR_ERR(root);
2239 }
2240 }
2241
2242 key.objectid = sk->min_objectid;
2243 key.type = sk->min_type;
2244 key.offset = sk->min_offset;
2245
2246 while (1) {
2247 ret = fault_in_pages_writeable(ubuf + sk_offset,
2248 *buf_size - sk_offset);
2249 if (ret)
2250 break;
2251
2252 ret = btrfs_search_forward(root, &key, path, sk->min_transid);
2253 if (ret != 0) {
2254 if (ret > 0)
2255 ret = 0;
2256 goto err;
2257 }
2258 ret = copy_to_sk(path, &key, sk, buf_size, ubuf,
2259 &sk_offset, &num_found);
2260 btrfs_release_path(path);
2261 if (ret)
2262 break;
2263
2264 }
2265 if (ret > 0)
2266 ret = 0;
2267err:
2268 sk->nr_items = num_found;
2269 btrfs_put_root(root);
2270 btrfs_free_path(path);
2271 return ret;
2272}
2273
2274static noinline int btrfs_ioctl_tree_search(struct file *file,
2275 void __user *argp)
2276{
2277 struct btrfs_ioctl_search_args __user *uargs;
2278 struct btrfs_ioctl_search_key sk;
2279 struct inode *inode;
2280 int ret;
2281 size_t buf_size;
2282
2283 if (!capable(CAP_SYS_ADMIN))
2284 return -EPERM;
2285
2286 uargs = (struct btrfs_ioctl_search_args __user *)argp;
2287
2288 if (copy_from_user(&sk, &uargs->key, sizeof(sk)))
2289 return -EFAULT;
2290
2291 buf_size = sizeof(uargs->buf);
2292
2293 inode = file_inode(file);
2294 ret = search_ioctl(inode, &sk, &buf_size, uargs->buf);
2295
2296
2297
2298
2299
2300 if (ret == -EOVERFLOW)
2301 ret = 0;
2302
2303 if (ret == 0 && copy_to_user(&uargs->key, &sk, sizeof(sk)))
2304 ret = -EFAULT;
2305 return ret;
2306}
2307
2308static noinline int btrfs_ioctl_tree_search_v2(struct file *file,
2309 void __user *argp)
2310{
2311 struct btrfs_ioctl_search_args_v2 __user *uarg;
2312 struct btrfs_ioctl_search_args_v2 args;
2313 struct inode *inode;
2314 int ret;
2315 size_t buf_size;
2316 const size_t buf_limit = SZ_16M;
2317
2318 if (!capable(CAP_SYS_ADMIN))
2319 return -EPERM;
2320
2321
2322 uarg = (struct btrfs_ioctl_search_args_v2 __user *)argp;
2323 if (copy_from_user(&args, uarg, sizeof(args)))
2324 return -EFAULT;
2325
2326 buf_size = args.buf_size;
2327
2328
2329 if (buf_size > buf_limit)
2330 buf_size = buf_limit;
2331
2332 inode = file_inode(file);
2333 ret = search_ioctl(inode, &args.key, &buf_size,
2334 (char __user *)(&uarg->buf[0]));
2335 if (ret == 0 && copy_to_user(&uarg->key, &args.key, sizeof(args.key)))
2336 ret = -EFAULT;
2337 else if (ret == -EOVERFLOW &&
2338 copy_to_user(&uarg->buf_size, &buf_size, sizeof(buf_size)))
2339 ret = -EFAULT;
2340
2341 return ret;
2342}
2343
2344
2345
2346
2347
2348static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
2349 u64 tree_id, u64 dirid, char *name)
2350{
2351 struct btrfs_root *root;
2352 struct btrfs_key key;
2353 char *ptr;
2354 int ret = -1;
2355 int slot;
2356 int len;
2357 int total_len = 0;
2358 struct btrfs_inode_ref *iref;
2359 struct extent_buffer *l;
2360 struct btrfs_path *path;
2361
2362 if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
2363 name[0]='\0';
2364 return 0;
2365 }
2366
2367 path = btrfs_alloc_path();
2368 if (!path)
2369 return -ENOMEM;
2370
2371 ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX - 1];
2372
2373 root = btrfs_get_fs_root(info, tree_id, true);
2374 if (IS_ERR(root)) {
2375 ret = PTR_ERR(root);
2376 root = NULL;
2377 goto out;
2378 }
2379
2380 key.objectid = dirid;
2381 key.type = BTRFS_INODE_REF_KEY;
2382 key.offset = (u64)-1;
2383
2384 while (1) {
2385 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2386 if (ret < 0)
2387 goto out;
2388 else if (ret > 0) {
2389 ret = btrfs_previous_item(root, path, dirid,
2390 BTRFS_INODE_REF_KEY);
2391 if (ret < 0)
2392 goto out;
2393 else if (ret > 0) {
2394 ret = -ENOENT;
2395 goto out;
2396 }
2397 }
2398
2399 l = path->nodes[0];
2400 slot = path->slots[0];
2401 btrfs_item_key_to_cpu(l, &key, slot);
2402
2403 iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
2404 len = btrfs_inode_ref_name_len(l, iref);
2405 ptr -= len + 1;
2406 total_len += len + 1;
2407 if (ptr < name) {
2408 ret = -ENAMETOOLONG;
2409 goto out;
2410 }
2411
2412 *(ptr + len) = '/';
2413 read_extent_buffer(l, ptr, (unsigned long)(iref + 1), len);
2414
2415 if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
2416 break;
2417
2418 btrfs_release_path(path);
2419 key.objectid = key.offset;
2420 key.offset = (u64)-1;
2421 dirid = key.objectid;
2422 }
2423 memmove(name, ptr, total_len);
2424 name[total_len] = '\0';
2425 ret = 0;
2426out:
2427 btrfs_put_root(root);
2428 btrfs_free_path(path);
2429 return ret;
2430}
2431
2432static int btrfs_search_path_in_tree_user(struct inode *inode,
2433 struct btrfs_ioctl_ino_lookup_user_args *args)
2434{
2435 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
2436 struct super_block *sb = inode->i_sb;
2437 struct btrfs_key upper_limit = BTRFS_I(inode)->location;
2438 u64 treeid = BTRFS_I(inode)->root->root_key.objectid;
2439 u64 dirid = args->dirid;
2440 unsigned long item_off;
2441 unsigned long item_len;
2442 struct btrfs_inode_ref *iref;
2443 struct btrfs_root_ref *rref;
2444 struct btrfs_root *root = NULL;
2445 struct btrfs_path *path;
2446 struct btrfs_key key, key2;
2447 struct extent_buffer *leaf;
2448 struct inode *temp_inode;
2449 char *ptr;
2450 int slot;
2451 int len;
2452 int total_len = 0;
2453 int ret;
2454
2455 path = btrfs_alloc_path();
2456 if (!path)
2457 return -ENOMEM;
2458
2459
2460
2461
2462
2463 if (dirid != upper_limit.objectid) {
2464 ptr = &args->path[BTRFS_INO_LOOKUP_USER_PATH_MAX - 1];
2465
2466 root = btrfs_get_fs_root(fs_info, treeid, true);
2467 if (IS_ERR(root)) {
2468 ret = PTR_ERR(root);
2469 goto out;
2470 }
2471
2472 key.objectid = dirid;
2473 key.type = BTRFS_INODE_REF_KEY;
2474 key.offset = (u64)-1;
2475 while (1) {
2476 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2477 if (ret < 0) {
2478 goto out_put;
2479 } else if (ret > 0) {
2480 ret = btrfs_previous_item(root, path, dirid,
2481 BTRFS_INODE_REF_KEY);
2482 if (ret < 0) {
2483 goto out_put;
2484 } else if (ret > 0) {
2485 ret = -ENOENT;
2486 goto out_put;
2487 }
2488 }
2489
2490 leaf = path->nodes[0];
2491 slot = path->slots[0];
2492 btrfs_item_key_to_cpu(leaf, &key, slot);
2493
2494 iref = btrfs_item_ptr(leaf, slot, struct btrfs_inode_ref);
2495 len = btrfs_inode_ref_name_len(leaf, iref);
2496 ptr -= len + 1;
2497 total_len += len + 1;
2498 if (ptr < args->path) {
2499 ret = -ENAMETOOLONG;
2500 goto out_put;
2501 }
2502
2503 *(ptr + len) = '/';
2504 read_extent_buffer(leaf, ptr,
2505 (unsigned long)(iref + 1), len);
2506
2507
2508 ret = btrfs_previous_item(root, path, dirid,
2509 BTRFS_INODE_ITEM_KEY);
2510 if (ret < 0) {
2511 goto out_put;
2512 } else if (ret > 0) {
2513 ret = -ENOENT;
2514 goto out_put;
2515 }
2516
2517 leaf = path->nodes[0];
2518 slot = path->slots[0];
2519 btrfs_item_key_to_cpu(leaf, &key2, slot);
2520 if (key2.objectid != dirid) {
2521 ret = -ENOENT;
2522 goto out_put;
2523 }
2524
2525 temp_inode = btrfs_iget(sb, key2.objectid, root);
2526 if (IS_ERR(temp_inode)) {
2527 ret = PTR_ERR(temp_inode);
2528 goto out_put;
2529 }
2530 ret = inode_permission(&init_user_ns, temp_inode,
2531 MAY_READ | MAY_EXEC);
2532 iput(temp_inode);
2533 if (ret) {
2534 ret = -EACCES;
2535 goto out_put;
2536 }
2537
2538 if (key.offset == upper_limit.objectid)
2539 break;
2540 if (key.objectid == BTRFS_FIRST_FREE_OBJECTID) {
2541 ret = -EACCES;
2542 goto out_put;
2543 }
2544
2545 btrfs_release_path(path);
2546 key.objectid = key.offset;
2547 key.offset = (u64)-1;
2548 dirid = key.objectid;
2549 }
2550
2551 memmove(args->path, ptr, total_len);
2552 args->path[total_len] = '\0';
2553 btrfs_put_root(root);
2554 root = NULL;
2555 btrfs_release_path(path);
2556 }
2557
2558
2559 key.objectid = treeid;
2560 key.type = BTRFS_ROOT_REF_KEY;
2561 key.offset = args->treeid;
2562 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2563 if (ret < 0) {
2564 goto out;
2565 } else if (ret > 0) {
2566 ret = -ENOENT;
2567 goto out;
2568 }
2569
2570 leaf = path->nodes[0];
2571 slot = path->slots[0];
2572 btrfs_item_key_to_cpu(leaf, &key, slot);
2573
2574 item_off = btrfs_item_ptr_offset(leaf, slot);
2575 item_len = btrfs_item_size_nr(leaf, slot);
2576
2577 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2578 if (args->dirid != btrfs_root_ref_dirid(leaf, rref)) {
2579 ret = -EINVAL;
2580 goto out;
2581 }
2582
2583
2584 item_off += sizeof(struct btrfs_root_ref);
2585 item_len -= sizeof(struct btrfs_root_ref);
2586 read_extent_buffer(leaf, args->name, item_off, item_len);
2587 args->name[item_len] = 0;
2588
2589out_put:
2590 btrfs_put_root(root);
2591out:
2592 btrfs_free_path(path);
2593 return ret;
2594}
2595
2596static noinline int btrfs_ioctl_ino_lookup(struct file *file,
2597 void __user *argp)
2598{
2599 struct btrfs_ioctl_ino_lookup_args *args;
2600 struct inode *inode;
2601 int ret = 0;
2602
2603 args = memdup_user(argp, sizeof(*args));
2604 if (IS_ERR(args))
2605 return PTR_ERR(args);
2606
2607 inode = file_inode(file);
2608
2609
2610
2611
2612
2613 if (args->treeid == 0)
2614 args->treeid = BTRFS_I(inode)->root->root_key.objectid;
2615
2616 if (args->objectid == BTRFS_FIRST_FREE_OBJECTID) {
2617 args->name[0] = 0;
2618 goto out;
2619 }
2620
2621 if (!capable(CAP_SYS_ADMIN)) {
2622 ret = -EPERM;
2623 goto out;
2624 }
2625
2626 ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info,
2627 args->treeid, args->objectid,
2628 args->name);
2629
2630out:
2631 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2632 ret = -EFAULT;
2633
2634 kfree(args);
2635 return ret;
2636}
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650static int btrfs_ioctl_ino_lookup_user(struct file *file, void __user *argp)
2651{
2652 struct btrfs_ioctl_ino_lookup_user_args *args;
2653 struct inode *inode;
2654 int ret;
2655
2656 args = memdup_user(argp, sizeof(*args));
2657 if (IS_ERR(args))
2658 return PTR_ERR(args);
2659
2660 inode = file_inode(file);
2661
2662 if (args->dirid == BTRFS_FIRST_FREE_OBJECTID &&
2663 BTRFS_I(inode)->location.objectid != BTRFS_FIRST_FREE_OBJECTID) {
2664
2665
2666
2667
2668 kfree(args);
2669 return -EACCES;
2670 }
2671
2672 ret = btrfs_search_path_in_tree_user(inode, args);
2673
2674 if (ret == 0 && copy_to_user(argp, args, sizeof(*args)))
2675 ret = -EFAULT;
2676
2677 kfree(args);
2678 return ret;
2679}
2680
2681
2682static int btrfs_ioctl_get_subvol_info(struct file *file, void __user *argp)
2683{
2684 struct btrfs_ioctl_get_subvol_info_args *subvol_info;
2685 struct btrfs_fs_info *fs_info;
2686 struct btrfs_root *root;
2687 struct btrfs_path *path;
2688 struct btrfs_key key;
2689 struct btrfs_root_item *root_item;
2690 struct btrfs_root_ref *rref;
2691 struct extent_buffer *leaf;
2692 unsigned long item_off;
2693 unsigned long item_len;
2694 struct inode *inode;
2695 int slot;
2696 int ret = 0;
2697
2698 path = btrfs_alloc_path();
2699 if (!path)
2700 return -ENOMEM;
2701
2702 subvol_info = kzalloc(sizeof(*subvol_info), GFP_KERNEL);
2703 if (!subvol_info) {
2704 btrfs_free_path(path);
2705 return -ENOMEM;
2706 }
2707
2708 inode = file_inode(file);
2709 fs_info = BTRFS_I(inode)->root->fs_info;
2710
2711
2712 key.objectid = BTRFS_I(inode)->root->root_key.objectid;
2713 root = btrfs_get_fs_root(fs_info, key.objectid, true);
2714 if (IS_ERR(root)) {
2715 ret = PTR_ERR(root);
2716 goto out_free;
2717 }
2718 root_item = &root->root_item;
2719
2720 subvol_info->treeid = key.objectid;
2721
2722 subvol_info->generation = btrfs_root_generation(root_item);
2723 subvol_info->flags = btrfs_root_flags(root_item);
2724
2725 memcpy(subvol_info->uuid, root_item->uuid, BTRFS_UUID_SIZE);
2726 memcpy(subvol_info->parent_uuid, root_item->parent_uuid,
2727 BTRFS_UUID_SIZE);
2728 memcpy(subvol_info->received_uuid, root_item->received_uuid,
2729 BTRFS_UUID_SIZE);
2730
2731 subvol_info->ctransid = btrfs_root_ctransid(root_item);
2732 subvol_info->ctime.sec = btrfs_stack_timespec_sec(&root_item->ctime);
2733 subvol_info->ctime.nsec = btrfs_stack_timespec_nsec(&root_item->ctime);
2734
2735 subvol_info->otransid = btrfs_root_otransid(root_item);
2736 subvol_info->otime.sec = btrfs_stack_timespec_sec(&root_item->otime);
2737 subvol_info->otime.nsec = btrfs_stack_timespec_nsec(&root_item->otime);
2738
2739 subvol_info->stransid = btrfs_root_stransid(root_item);
2740 subvol_info->stime.sec = btrfs_stack_timespec_sec(&root_item->stime);
2741 subvol_info->stime.nsec = btrfs_stack_timespec_nsec(&root_item->stime);
2742
2743 subvol_info->rtransid = btrfs_root_rtransid(root_item);
2744 subvol_info->rtime.sec = btrfs_stack_timespec_sec(&root_item->rtime);
2745 subvol_info->rtime.nsec = btrfs_stack_timespec_nsec(&root_item->rtime);
2746
2747 if (key.objectid != BTRFS_FS_TREE_OBJECTID) {
2748
2749 key.type = BTRFS_ROOT_BACKREF_KEY;
2750 key.offset = 0;
2751 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
2752 if (ret < 0) {
2753 goto out;
2754 } else if (path->slots[0] >=
2755 btrfs_header_nritems(path->nodes[0])) {
2756 ret = btrfs_next_leaf(fs_info->tree_root, path);
2757 if (ret < 0) {
2758 goto out;
2759 } else if (ret > 0) {
2760 ret = -EUCLEAN;
2761 goto out;
2762 }
2763 }
2764
2765 leaf = path->nodes[0];
2766 slot = path->slots[0];
2767 btrfs_item_key_to_cpu(leaf, &key, slot);
2768 if (key.objectid == subvol_info->treeid &&
2769 key.type == BTRFS_ROOT_BACKREF_KEY) {
2770 subvol_info->parent_id = key.offset;
2771
2772 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2773 subvol_info->dirid = btrfs_root_ref_dirid(leaf, rref);
2774
2775 item_off = btrfs_item_ptr_offset(leaf, slot)
2776 + sizeof(struct btrfs_root_ref);
2777 item_len = btrfs_item_size_nr(leaf, slot)
2778 - sizeof(struct btrfs_root_ref);
2779 read_extent_buffer(leaf, subvol_info->name,
2780 item_off, item_len);
2781 } else {
2782 ret = -ENOENT;
2783 goto out;
2784 }
2785 }
2786
2787 if (copy_to_user(argp, subvol_info, sizeof(*subvol_info)))
2788 ret = -EFAULT;
2789
2790out:
2791 btrfs_put_root(root);
2792out_free:
2793 btrfs_free_path(path);
2794 kfree(subvol_info);
2795 return ret;
2796}
2797
2798
2799
2800
2801
2802static int btrfs_ioctl_get_subvol_rootref(struct file *file, void __user *argp)
2803{
2804 struct btrfs_ioctl_get_subvol_rootref_args *rootrefs;
2805 struct btrfs_root_ref *rref;
2806 struct btrfs_root *root;
2807 struct btrfs_path *path;
2808 struct btrfs_key key;
2809 struct extent_buffer *leaf;
2810 struct inode *inode;
2811 u64 objectid;
2812 int slot;
2813 int ret;
2814 u8 found;
2815
2816 path = btrfs_alloc_path();
2817 if (!path)
2818 return -ENOMEM;
2819
2820 rootrefs = memdup_user(argp, sizeof(*rootrefs));
2821 if (IS_ERR(rootrefs)) {
2822 btrfs_free_path(path);
2823 return PTR_ERR(rootrefs);
2824 }
2825
2826 inode = file_inode(file);
2827 root = BTRFS_I(inode)->root->fs_info->tree_root;
2828 objectid = BTRFS_I(inode)->root->root_key.objectid;
2829
2830 key.objectid = objectid;
2831 key.type = BTRFS_ROOT_REF_KEY;
2832 key.offset = rootrefs->min_treeid;
2833 found = 0;
2834
2835 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2836 if (ret < 0) {
2837 goto out;
2838 } else if (path->slots[0] >=
2839 btrfs_header_nritems(path->nodes[0])) {
2840 ret = btrfs_next_leaf(root, path);
2841 if (ret < 0) {
2842 goto out;
2843 } else if (ret > 0) {
2844 ret = -EUCLEAN;
2845 goto out;
2846 }
2847 }
2848 while (1) {
2849 leaf = path->nodes[0];
2850 slot = path->slots[0];
2851
2852 btrfs_item_key_to_cpu(leaf, &key, slot);
2853 if (key.objectid != objectid || key.type != BTRFS_ROOT_REF_KEY) {
2854 ret = 0;
2855 goto out;
2856 }
2857
2858 if (found == BTRFS_MAX_ROOTREF_BUFFER_NUM) {
2859 ret = -EOVERFLOW;
2860 goto out;
2861 }
2862
2863 rref = btrfs_item_ptr(leaf, slot, struct btrfs_root_ref);
2864 rootrefs->rootref[found].treeid = key.offset;
2865 rootrefs->rootref[found].dirid =
2866 btrfs_root_ref_dirid(leaf, rref);
2867 found++;
2868
2869 ret = btrfs_next_item(root, path);
2870 if (ret < 0) {
2871 goto out;
2872 } else if (ret > 0) {
2873 ret = -EUCLEAN;
2874 goto out;
2875 }
2876 }
2877
2878out:
2879 if (!ret || ret == -EOVERFLOW) {
2880 rootrefs->num_items = found;
2881
2882 if (found)
2883 rootrefs->min_treeid =
2884 rootrefs->rootref[found - 1].treeid + 1;
2885 if (copy_to_user(argp, rootrefs, sizeof(*rootrefs)))
2886 ret = -EFAULT;
2887 }
2888
2889 kfree(rootrefs);
2890 btrfs_free_path(path);
2891
2892 return ret;
2893}
2894
2895static noinline int btrfs_ioctl_snap_destroy(struct file *file,
2896 void __user *arg,
2897 bool destroy_v2)
2898{
2899 struct dentry *parent = file->f_path.dentry;
2900 struct btrfs_fs_info *fs_info = btrfs_sb(parent->d_sb);
2901 struct dentry *dentry;
2902 struct inode *dir = d_inode(parent);
2903 struct inode *inode;
2904 struct btrfs_root *root = BTRFS_I(dir)->root;
2905 struct btrfs_root *dest = NULL;
2906 struct btrfs_ioctl_vol_args *vol_args = NULL;
2907 struct btrfs_ioctl_vol_args_v2 *vol_args2 = NULL;
2908 char *subvol_name, *subvol_name_ptr = NULL;
2909 int subvol_namelen;
2910 int err = 0;
2911 bool destroy_parent = false;
2912
2913 if (destroy_v2) {
2914 vol_args2 = memdup_user(arg, sizeof(*vol_args2));
2915 if (IS_ERR(vol_args2))
2916 return PTR_ERR(vol_args2);
2917
2918 if (vol_args2->flags & ~BTRFS_SUBVOL_DELETE_ARGS_MASK) {
2919 err = -EOPNOTSUPP;
2920 goto out;
2921 }
2922
2923
2924
2925
2926
2927 if (!(vol_args2->flags & BTRFS_SUBVOL_SPEC_BY_ID)) {
2928 vol_args2->name[BTRFS_SUBVOL_NAME_MAX] = 0;
2929 subvol_name = vol_args2->name;
2930
2931 err = mnt_want_write_file(file);
2932 if (err)
2933 goto out;
2934 } else {
2935 if (vol_args2->subvolid < BTRFS_FIRST_FREE_OBJECTID) {
2936 err = -EINVAL;
2937 goto out;
2938 }
2939
2940 err = mnt_want_write_file(file);
2941 if (err)
2942 goto out;
2943
2944 dentry = btrfs_get_dentry(fs_info->sb,
2945 BTRFS_FIRST_FREE_OBJECTID,
2946 vol_args2->subvolid, 0, 0);
2947 if (IS_ERR(dentry)) {
2948 err = PTR_ERR(dentry);
2949 goto out_drop_write;
2950 }
2951
2952
2953
2954
2955
2956 parent = btrfs_get_parent(dentry);
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966 dput(dentry);
2967 if (IS_ERR(parent)) {
2968 err = PTR_ERR(parent);
2969 goto out_drop_write;
2970 }
2971 dir = d_inode(parent);
2972
2973
2974
2975
2976
2977
2978
2979 destroy_parent = true;
2980
2981 subvol_name_ptr = btrfs_get_subvol_name_from_objectid(
2982 fs_info, vol_args2->subvolid);
2983 if (IS_ERR(subvol_name_ptr)) {
2984 err = PTR_ERR(subvol_name_ptr);
2985 goto free_parent;
2986 }
2987
2988 subvol_name = (char *)kbasename(subvol_name_ptr);
2989 }
2990 } else {
2991 vol_args = memdup_user(arg, sizeof(*vol_args));
2992 if (IS_ERR(vol_args))
2993 return PTR_ERR(vol_args);
2994
2995 vol_args->name[BTRFS_PATH_NAME_MAX] = 0;
2996 subvol_name = vol_args->name;
2997
2998 err = mnt_want_write_file(file);
2999 if (err)
3000 goto out;
3001 }
3002
3003 subvol_namelen = strlen(subvol_name);
3004
3005 if (strchr(subvol_name, '/') ||
3006 strncmp(subvol_name, "..", subvol_namelen) == 0) {
3007 err = -EINVAL;
3008 goto free_subvol_name;
3009 }
3010
3011 if (!S_ISDIR(dir->i_mode)) {
3012 err = -ENOTDIR;
3013 goto free_subvol_name;
3014 }
3015
3016 err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT);
3017 if (err == -EINTR)
3018 goto free_subvol_name;
3019 dentry = lookup_one_len(subvol_name, parent, subvol_namelen);
3020 if (IS_ERR(dentry)) {
3021 err = PTR_ERR(dentry);
3022 goto out_unlock_dir;
3023 }
3024
3025 if (d_really_is_negative(dentry)) {
3026 err = -ENOENT;
3027 goto out_dput;
3028 }
3029
3030 inode = d_inode(dentry);
3031 dest = BTRFS_I(inode)->root;
3032 if (!capable(CAP_SYS_ADMIN)) {
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046 err = -EPERM;
3047 if (!btrfs_test_opt(fs_info, USER_SUBVOL_RM_ALLOWED))
3048 goto out_dput;
3049
3050
3051
3052
3053
3054
3055
3056
3057 err = -EINVAL;
3058 if (root == dest)
3059 goto out_dput;
3060
3061 err = inode_permission(&init_user_ns, inode,
3062 MAY_WRITE | MAY_EXEC);
3063 if (err)
3064 goto out_dput;
3065 }
3066
3067
3068 err = btrfs_may_delete(dir, dentry, 1);
3069 if (err)
3070 goto out_dput;
3071
3072 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
3073 err = -EINVAL;
3074 goto out_dput;
3075 }
3076
3077 btrfs_inode_lock(inode, 0);
3078 err = btrfs_delete_subvolume(dir, dentry);
3079 btrfs_inode_unlock(inode, 0);
3080 if (!err) {
3081 fsnotify_rmdir(dir, dentry);
3082 d_delete(dentry);
3083 }
3084
3085out_dput:
3086 dput(dentry);
3087out_unlock_dir:
3088 btrfs_inode_unlock(dir, 0);
3089free_subvol_name:
3090 kfree(subvol_name_ptr);
3091free_parent:
3092 if (destroy_parent)
3093 dput(parent);
3094out_drop_write:
3095 mnt_drop_write_file(file);
3096out:
3097 kfree(vol_args2);
3098 kfree(vol_args);
3099 return err;
3100}
3101
3102static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
3103{
3104 struct inode *inode = file_inode(file);
3105 struct btrfs_root *root = BTRFS_I(inode)->root;
3106 struct btrfs_ioctl_defrag_range_args *range;
3107 int ret;
3108
3109 ret = mnt_want_write_file(file);
3110 if (ret)
3111 return ret;
3112
3113 if (btrfs_root_readonly(root)) {
3114 ret = -EROFS;
3115 goto out;
3116 }
3117
3118 switch (inode->i_mode & S_IFMT) {
3119 case S_IFDIR:
3120 if (!capable(CAP_SYS_ADMIN)) {
3121 ret = -EPERM;
3122 goto out;
3123 }
3124 ret = btrfs_defrag_root(root);
3125 break;
3126 case S_IFREG:
3127
3128
3129
3130
3131
3132 if (!capable(CAP_SYS_ADMIN) &&
3133 inode_permission(&init_user_ns, inode, MAY_WRITE)) {
3134 ret = -EPERM;
3135 goto out;
3136 }
3137
3138 range = kzalloc(sizeof(*range), GFP_KERNEL);
3139 if (!range) {
3140 ret = -ENOMEM;
3141 goto out;
3142 }
3143
3144 if (argp) {
3145 if (copy_from_user(range, argp,
3146 sizeof(*range))) {
3147 ret = -EFAULT;
3148 kfree(range);
3149 goto out;
3150 }
3151
3152 if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) {
3153 range->flags |= BTRFS_DEFRAG_RANGE_START_IO;
3154 range->extent_thresh = (u32)-1;
3155 }
3156 } else {
3157
3158 range->len = (u64)-1;
3159 }
3160 ret = btrfs_defrag_file(file_inode(file), file,
3161 range, BTRFS_OLDEST_GENERATION, 0);
3162 if (ret > 0)
3163 ret = 0;
3164 kfree(range);
3165 break;
3166 default:
3167 ret = -EINVAL;
3168 }
3169out:
3170 mnt_drop_write_file(file);
3171 return ret;
3172}
3173
3174static long btrfs_ioctl_add_dev(struct btrfs_fs_info *fs_info, void __user *arg)
3175{
3176 struct btrfs_ioctl_vol_args *vol_args;
3177 int ret;
3178
3179 if (!capable(CAP_SYS_ADMIN))
3180 return -EPERM;
3181
3182 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_ADD))
3183 return BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3184
3185 vol_args = memdup_user(arg, sizeof(*vol_args));
3186 if (IS_ERR(vol_args)) {
3187 ret = PTR_ERR(vol_args);
3188 goto out;
3189 }
3190
3191 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3192 ret = btrfs_init_new_device(fs_info, vol_args->name);
3193
3194 if (!ret)
3195 btrfs_info(fs_info, "disk added %s", vol_args->name);
3196
3197 kfree(vol_args);
3198out:
3199 btrfs_exclop_finish(fs_info);
3200 return ret;
3201}
3202
3203static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
3204{
3205 struct inode *inode = file_inode(file);
3206 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3207 struct btrfs_ioctl_vol_args_v2 *vol_args;
3208 int ret;
3209 bool cancel = false;
3210
3211 if (!capable(CAP_SYS_ADMIN))
3212 return -EPERM;
3213
3214 ret = mnt_want_write_file(file);
3215 if (ret)
3216 return ret;
3217
3218 vol_args = memdup_user(arg, sizeof(*vol_args));
3219 if (IS_ERR(vol_args)) {
3220 ret = PTR_ERR(vol_args);
3221 goto err_drop;
3222 }
3223
3224 if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
3225 ret = -EOPNOTSUPP;
3226 goto out;
3227 }
3228 vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0';
3229 if (!(vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID) &&
3230 strcmp("cancel", vol_args->name) == 0)
3231 cancel = true;
3232
3233 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
3234 cancel);
3235 if (ret)
3236 goto out;
3237
3238
3239 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3240 ret = btrfs_rm_device(fs_info, NULL, vol_args->devid);
3241 else
3242 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3243
3244 btrfs_exclop_finish(fs_info);
3245
3246 if (!ret) {
3247 if (vol_args->flags & BTRFS_DEVICE_SPEC_BY_ID)
3248 btrfs_info(fs_info, "device deleted: id %llu",
3249 vol_args->devid);
3250 else
3251 btrfs_info(fs_info, "device deleted: %s",
3252 vol_args->name);
3253 }
3254out:
3255 kfree(vol_args);
3256err_drop:
3257 mnt_drop_write_file(file);
3258 return ret;
3259}
3260
3261static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg)
3262{
3263 struct inode *inode = file_inode(file);
3264 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3265 struct btrfs_ioctl_vol_args *vol_args;
3266 int ret;
3267 bool cancel;
3268
3269 if (!capable(CAP_SYS_ADMIN))
3270 return -EPERM;
3271
3272 ret = mnt_want_write_file(file);
3273 if (ret)
3274 return ret;
3275
3276 vol_args = memdup_user(arg, sizeof(*vol_args));
3277 if (IS_ERR(vol_args)) {
3278 ret = PTR_ERR(vol_args);
3279 goto out_drop_write;
3280 }
3281 vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
3282 cancel = (strcmp("cancel", vol_args->name) == 0);
3283
3284 ret = exclop_start_or_cancel_reloc(fs_info, BTRFS_EXCLOP_DEV_REMOVE,
3285 cancel);
3286 if (ret == 0) {
3287 ret = btrfs_rm_device(fs_info, vol_args->name, 0);
3288 if (!ret)
3289 btrfs_info(fs_info, "disk deleted %s", vol_args->name);
3290 btrfs_exclop_finish(fs_info);
3291 }
3292
3293 kfree(vol_args);
3294out_drop_write:
3295 mnt_drop_write_file(file);
3296
3297 return ret;
3298}
3299
3300static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
3301 void __user *arg)
3302{
3303 struct btrfs_ioctl_fs_info_args *fi_args;
3304 struct btrfs_device *device;
3305 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
3306 u64 flags_in;
3307 int ret = 0;
3308
3309 fi_args = memdup_user(arg, sizeof(*fi_args));
3310 if (IS_ERR(fi_args))
3311 return PTR_ERR(fi_args);
3312
3313 flags_in = fi_args->flags;
3314 memset(fi_args, 0, sizeof(*fi_args));
3315
3316 rcu_read_lock();
3317 fi_args->num_devices = fs_devices->num_devices;
3318
3319 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
3320 if (device->devid > fi_args->max_id)
3321 fi_args->max_id = device->devid;
3322 }
3323 rcu_read_unlock();
3324
3325 memcpy(&fi_args->fsid, fs_devices->fsid, sizeof(fi_args->fsid));
3326 fi_args->nodesize = fs_info->nodesize;
3327 fi_args->sectorsize = fs_info->sectorsize;
3328 fi_args->clone_alignment = fs_info->sectorsize;
3329
3330 if (flags_in & BTRFS_FS_INFO_FLAG_CSUM_INFO) {
3331 fi_args->csum_type = btrfs_super_csum_type(fs_info->super_copy);
3332 fi_args->csum_size = btrfs_super_csum_size(fs_info->super_copy);
3333 fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
3334 }
3335
3336 if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
3337 fi_args->generation = fs_info->generation;
3338 fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
3339 }
3340
3341 if (flags_in & BTRFS_FS_INFO_FLAG_METADATA_UUID) {
3342 memcpy(&fi_args->metadata_uuid, fs_devices->metadata_uuid,
3343 sizeof(fi_args->metadata_uuid));
3344 fi_args->flags |= BTRFS_FS_INFO_FLAG_METADATA_UUID;
3345 }
3346
3347 if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
3348 ret = -EFAULT;
3349
3350 kfree(fi_args);
3351 return ret;
3352}
3353
3354static long btrfs_ioctl_dev_info(struct btrfs_fs_info *fs_info,
3355 void __user *arg)
3356{
3357 struct btrfs_ioctl_dev_info_args *di_args;
3358 struct btrfs_device *dev;
3359 int ret = 0;
3360 char *s_uuid = NULL;
3361
3362 di_args = memdup_user(arg, sizeof(*di_args));
3363 if (IS_ERR(di_args))
3364 return PTR_ERR(di_args);
3365
3366 if (!btrfs_is_empty_uuid(di_args->uuid))
3367 s_uuid = di_args->uuid;
3368
3369 rcu_read_lock();
3370 dev = btrfs_find_device(fs_info->fs_devices, di_args->devid, s_uuid,
3371 NULL);
3372
3373 if (!dev) {
3374 ret = -ENODEV;
3375 goto out;
3376 }
3377
3378 di_args->devid = dev->devid;
3379 di_args->bytes_used = btrfs_device_get_bytes_used(dev);
3380 di_args->total_bytes = btrfs_device_get_total_bytes(dev);
3381 memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
3382 if (dev->name) {
3383 strncpy(di_args->path, rcu_str_deref(dev->name),
3384 sizeof(di_args->path) - 1);
3385 di_args->path[sizeof(di_args->path) - 1] = 0;
3386 } else {
3387 di_args->path[0] = '\0';
3388 }
3389
3390out:
3391 rcu_read_unlock();
3392 if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
3393 ret = -EFAULT;
3394
3395 kfree(di_args);
3396 return ret;
3397}
3398
3399static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp)
3400{
3401 struct inode *inode = file_inode(file);
3402 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
3403 struct btrfs_root *root = BTRFS_I(inode)->root;
3404 struct btrfs_root *new_root;
3405 struct btrfs_dir_item *di;
3406 struct btrfs_trans_handle *trans;
3407 struct btrfs_path *path = NULL;
3408 struct btrfs_disk_key disk_key;
3409 u64 objectid = 0;
3410 u64 dir_id;
3411 int ret;
3412
3413 if (!capable(CAP_SYS_ADMIN))
3414 return -EPERM;
3415
3416 ret = mnt_want_write_file(file);
3417 if (ret)
3418 return ret;
3419
3420 if (copy_from_user(&objectid, argp, sizeof(objectid))) {
3421 ret = -EFAULT;
3422 goto out;
3423 }
3424
3425 if (!objectid)
3426 objectid = BTRFS_FS_TREE_OBJECTID;
3427
3428 new_root = btrfs_get_fs_root(fs_info, objectid, true);
3429 if (IS_ERR(new_root)) {
3430 ret = PTR_ERR(new_root);
3431 goto out;
3432 }
3433 if (!is_fstree(new_root->root_key.objectid)) {
3434 ret = -ENOENT;
3435 goto out_free;
3436 }
3437
3438 path = btrfs_alloc_path();
3439 if (!path) {
3440 ret = -ENOMEM;
3441 goto out_free;
3442 }
3443
3444 trans = btrfs_start_transaction(root, 1);
3445 if (IS_ERR(trans)) {
3446 ret = PTR_ERR(trans);
3447 goto out_free;
3448 }
3449
3450 dir_id = btrfs_super_root_dir(fs_info->super_copy);
3451 di = btrfs_lookup_dir_item(trans, fs_info->tree_root, path,
3452 dir_id, "default", 7, 1);
3453 if (IS_ERR_OR_NULL(di)) {
3454 btrfs_release_path(path);
3455 btrfs_end_transaction(trans);
3456 btrfs_err(fs_info,
3457 "Umm, you don't have the default diritem, this isn't going to work");
3458 ret = -ENOENT;
3459 goto out_free;
3460 }
3461
3462 btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key);
3463 btrfs_set_dir_item_key(path->nodes[0], di, &disk_key);
3464 btrfs_mark_buffer_dirty(path->nodes[0]);
3465 btrfs_release_path(path);
3466
3467 btrfs_set_fs_incompat(fs_info, DEFAULT_SUBVOL);
3468 btrfs_end_transaction(trans);
3469out_free:
3470 btrfs_put_root(new_root);
3471 btrfs_free_path(path);
3472out:
3473 mnt_drop_write_file(file);
3474 return ret;
3475}
3476
3477static void get_block_group_info(struct list_head *groups_list,
3478 struct btrfs_ioctl_space_info *space)
3479{
3480 struct btrfs_block_group *block_group;
3481
3482 space->total_bytes = 0;
3483 space->used_bytes = 0;
3484 space->flags = 0;
3485 list_for_each_entry(block_group, groups_list, list) {
3486 space->flags = block_group->flags;
3487 space->total_bytes += block_group->length;
3488 space->used_bytes += block_group->used;
3489 }
3490}
3491
3492static long btrfs_ioctl_space_info(struct btrfs_fs_info *fs_info,
3493 void __user *arg)
3494{
3495 struct btrfs_ioctl_space_args space_args;
3496 struct btrfs_ioctl_space_info space;
3497 struct btrfs_ioctl_space_info *dest;
3498 struct btrfs_ioctl_space_info *dest_orig;
3499 struct btrfs_ioctl_space_info __user *user_dest;
3500 struct btrfs_space_info *info;
3501 static const u64 types[] = {
3502 BTRFS_BLOCK_GROUP_DATA,
3503 BTRFS_BLOCK_GROUP_SYSTEM,
3504 BTRFS_BLOCK_GROUP_METADATA,
3505 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA
3506 };
3507 int num_types = 4;
3508 int alloc_size;
3509 int ret = 0;
3510 u64 slot_count = 0;
3511 int i, c;
3512
3513 if (copy_from_user(&space_args,
3514 (struct btrfs_ioctl_space_args __user *)arg,
3515 sizeof(space_args)))
3516 return -EFAULT;
3517
3518 for (i = 0; i < num_types; i++) {
3519 struct btrfs_space_info *tmp;
3520
3521 info = NULL;
3522 list_for_each_entry(tmp, &fs_info->space_info, list) {
3523 if (tmp->flags == types[i]) {
3524 info = tmp;
3525 break;
3526 }
3527 }
3528
3529 if (!info)
3530 continue;
3531
3532 down_read(&info->groups_sem);
3533 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3534 if (!list_empty(&info->block_groups[c]))
3535 slot_count++;
3536 }
3537 up_read(&info->groups_sem);
3538 }
3539
3540
3541
3542
3543 slot_count++;
3544
3545
3546 if (space_args.space_slots == 0) {
3547 space_args.total_spaces = slot_count;
3548 goto out;
3549 }
3550
3551 slot_count = min_t(u64, space_args.space_slots, slot_count);
3552
3553 alloc_size = sizeof(*dest) * slot_count;
3554
3555
3556
3557
3558 if (alloc_size > PAGE_SIZE)
3559 return -ENOMEM;
3560
3561 space_args.total_spaces = 0;
3562 dest = kmalloc(alloc_size, GFP_KERNEL);
3563 if (!dest)
3564 return -ENOMEM;
3565 dest_orig = dest;
3566
3567
3568 for (i = 0; i < num_types; i++) {
3569 struct btrfs_space_info *tmp;
3570
3571 if (!slot_count)
3572 break;
3573
3574 info = NULL;
3575 list_for_each_entry(tmp, &fs_info->space_info, list) {
3576 if (tmp->flags == types[i]) {
3577 info = tmp;
3578 break;
3579 }
3580 }
3581
3582 if (!info)
3583 continue;
3584 down_read(&info->groups_sem);
3585 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3586 if (!list_empty(&info->block_groups[c])) {
3587 get_block_group_info(&info->block_groups[c],
3588 &space);
3589 memcpy(dest, &space, sizeof(space));
3590 dest++;
3591 space_args.total_spaces++;
3592 slot_count--;
3593 }
3594 if (!slot_count)
3595 break;
3596 }
3597 up_read(&info->groups_sem);
3598 }
3599
3600
3601
3602
3603 if (slot_count) {
3604 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
3605
3606 spin_lock(&block_rsv->lock);
3607 space.total_bytes = block_rsv->size;
3608 space.used_bytes = block_rsv->size - block_rsv->reserved;
3609 spin_unlock(&block_rsv->lock);
3610 space.flags = BTRFS_SPACE_INFO_GLOBAL_RSV;
3611 memcpy(dest, &space, sizeof(space));
3612 space_args.total_spaces++;
3613 }
3614
3615 user_dest = (struct btrfs_ioctl_space_info __user *)
3616 (arg + sizeof(struct btrfs_ioctl_space_args));
3617
3618 if (copy_to_user(user_dest, dest_orig, alloc_size))
3619 ret = -EFAULT;
3620
3621 kfree(dest_orig);
3622out:
3623 if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args)))
3624 ret = -EFAULT;
3625
3626 return ret;
3627}
3628
3629static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root,
3630 void __user *argp)
3631{
3632 struct btrfs_trans_handle *trans;
3633 u64 transid;
3634 int ret;
3635
3636 trans = btrfs_attach_transaction_barrier(root);
3637 if (IS_ERR(trans)) {
3638 if (PTR_ERR(trans) != -ENOENT)
3639 return PTR_ERR(trans);
3640
3641
3642 transid = root->fs_info->last_trans_committed;
3643 goto out;
3644 }
3645 transid = trans->transid;
3646 ret = btrfs_commit_transaction_async(trans);
3647 if (ret) {
3648 btrfs_end_transaction(trans);
3649 return ret;
3650 }
3651out:
3652 if (argp)
3653 if (copy_to_user(argp, &transid, sizeof(transid)))
3654 return -EFAULT;
3655 return 0;
3656}
3657
3658static noinline long btrfs_ioctl_wait_sync(struct btrfs_fs_info *fs_info,
3659 void __user *argp)
3660{
3661 u64 transid;
3662
3663 if (argp) {
3664 if (copy_from_user(&transid, argp, sizeof(transid)))
3665 return -EFAULT;
3666 } else {
3667 transid = 0;
3668 }
3669 return btrfs_wait_for_commit(fs_info, transid);
3670}
3671
3672static long btrfs_ioctl_scrub(struct file *file, void __user *arg)
3673{
3674 struct btrfs_fs_info *fs_info = btrfs_sb(file_inode(file)->i_sb);
3675 struct btrfs_ioctl_scrub_args *sa;
3676 int ret;
3677
3678 if (!capable(CAP_SYS_ADMIN))
3679 return -EPERM;
3680
3681 sa = memdup_user(arg, sizeof(*sa));
3682 if (IS_ERR(sa))
3683 return PTR_ERR(sa);
3684
3685 if (!(sa->flags & BTRFS_SCRUB_READONLY)) {
3686 ret = mnt_want_write_file(file);
3687 if (ret)
3688 goto out;
3689 }
3690
3691 ret = btrfs_scrub_dev(fs_info, sa->devid, sa->start, sa->end,
3692 &sa->progress, sa->flags & BTRFS_SCRUB_READONLY,
3693 0);
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707 if (copy_to_user(arg, sa, sizeof(*sa)))
3708 ret = -EFAULT;
3709
3710 if (!(sa->flags & BTRFS_SCRUB_READONLY))
3711 mnt_drop_write_file(file);
3712out:
3713 kfree(sa);
3714 return ret;
3715}
3716
3717static long btrfs_ioctl_scrub_cancel(struct btrfs_fs_info *fs_info)
3718{
3719 if (!capable(CAP_SYS_ADMIN))
3720 return -EPERM;
3721
3722 return btrfs_scrub_cancel(fs_info);
3723}
3724
3725static long btrfs_ioctl_scrub_progress(struct btrfs_fs_info *fs_info,
3726 void __user *arg)
3727{
3728 struct btrfs_ioctl_scrub_args *sa;
3729 int ret;
3730
3731 if (!capable(CAP_SYS_ADMIN))
3732 return -EPERM;
3733
3734 sa = memdup_user(arg, sizeof(*sa));
3735 if (IS_ERR(sa))
3736 return PTR_ERR(sa);
3737
3738 ret = btrfs_scrub_progress(fs_info, sa->devid, &sa->progress);
3739
3740 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3741 ret = -EFAULT;
3742
3743 kfree(sa);
3744 return ret;
3745}
3746
3747static long btrfs_ioctl_get_dev_stats(struct btrfs_fs_info *fs_info,
3748 void __user *arg)
3749{
3750 struct btrfs_ioctl_get_dev_stats *sa;
3751 int ret;
3752
3753 sa = memdup_user(arg, sizeof(*sa));
3754 if (IS_ERR(sa))
3755 return PTR_ERR(sa);
3756
3757 if ((sa->flags & BTRFS_DEV_STATS_RESET) && !capable(CAP_SYS_ADMIN)) {
3758 kfree(sa);
3759 return -EPERM;
3760 }
3761
3762 ret = btrfs_get_dev_stats(fs_info, sa);
3763
3764 if (ret == 0 && copy_to_user(arg, sa, sizeof(*sa)))
3765 ret = -EFAULT;
3766
3767 kfree(sa);
3768 return ret;
3769}
3770
3771static long btrfs_ioctl_dev_replace(struct btrfs_fs_info *fs_info,
3772 void __user *arg)
3773{
3774 struct btrfs_ioctl_dev_replace_args *p;
3775 int ret;
3776
3777 if (!capable(CAP_SYS_ADMIN))
3778 return -EPERM;
3779
3780 p = memdup_user(arg, sizeof(*p));
3781 if (IS_ERR(p))
3782 return PTR_ERR(p);
3783
3784 switch (p->cmd) {
3785 case BTRFS_IOCTL_DEV_REPLACE_CMD_START:
3786 if (sb_rdonly(fs_info->sb)) {
3787 ret = -EROFS;
3788 goto out;
3789 }
3790 if (!btrfs_exclop_start(fs_info, BTRFS_EXCLOP_DEV_REPLACE)) {
3791 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
3792 } else {
3793 ret = btrfs_dev_replace_by_ioctl(fs_info, p);
3794 btrfs_exclop_finish(fs_info);
3795 }
3796 break;
3797 case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS:
3798 btrfs_dev_replace_status(fs_info, p);
3799 ret = 0;
3800 break;
3801 case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL:
3802 p->result = btrfs_dev_replace_cancel(fs_info);
3803 ret = 0;
3804 break;
3805 default:
3806 ret = -EINVAL;
3807 break;
3808 }
3809
3810 if ((ret == 0 || ret == -ECANCELED) && copy_to_user(arg, p, sizeof(*p)))
3811 ret = -EFAULT;
3812out:
3813 kfree(p);
3814 return ret;
3815}
3816
3817static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)
3818{
3819 int ret = 0;
3820 int i;
3821 u64 rel_ptr;
3822 int size;
3823 struct btrfs_ioctl_ino_path_args *ipa = NULL;
3824 struct inode_fs_paths *ipath = NULL;
3825 struct btrfs_path *path;
3826
3827 if (!capable(CAP_DAC_READ_SEARCH))
3828 return -EPERM;
3829
3830 path = btrfs_alloc_path();
3831 if (!path) {
3832 ret = -ENOMEM;
3833 goto out;
3834 }
3835
3836 ipa = memdup_user(arg, sizeof(*ipa));
3837 if (IS_ERR(ipa)) {
3838 ret = PTR_ERR(ipa);
3839 ipa = NULL;
3840 goto out;
3841 }
3842
3843 size = min_t(u32, ipa->size, 4096);
3844 ipath = init_ipath(size, root, path);
3845 if (IS_ERR(ipath)) {
3846 ret = PTR_ERR(ipath);
3847 ipath = NULL;
3848 goto out;
3849 }
3850
3851 ret = paths_from_inode(ipa->inum, ipath);
3852 if (ret < 0)
3853 goto out;
3854
3855 for (i = 0; i < ipath->fspath->elem_cnt; ++i) {
3856 rel_ptr = ipath->fspath->val[i] -
3857 (u64)(unsigned long)ipath->fspath->val;
3858 ipath->fspath->val[i] = rel_ptr;
3859 }
3860
3861 ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
3862 ipath->fspath, size);
3863 if (ret) {
3864 ret = -EFAULT;
3865 goto out;
3866 }
3867
3868out:
3869 btrfs_free_path(path);
3870 free_ipath(ipath);
3871 kfree(ipa);
3872
3873 return ret;
3874}
3875
3876static int build_ino_list(u64 inum, u64 offset, u64 root, void *ctx)
3877{
3878 struct btrfs_data_container *inodes = ctx;
3879 const size_t c = 3 * sizeof(u64);
3880
3881 if (inodes->bytes_left >= c) {
3882 inodes->bytes_left -= c;
3883 inodes->val[inodes->elem_cnt] = inum;
3884 inodes->val[inodes->elem_cnt + 1] = offset;
3885 inodes->val[inodes->elem_cnt + 2] = root;
3886 inodes->elem_cnt += 3;
3887 } else {
3888 inodes->bytes_missing += c - inodes->bytes_left;
3889 inodes->bytes_left = 0;
3890 inodes->elem_missed += 3;
3891 }
3892
3893 return 0;
3894}
3895
3896static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
3897 void __user *arg, int version)
3898{
3899 int ret = 0;
3900 int size;
3901 struct btrfs_ioctl_logical_ino_args *loi;
3902 struct btrfs_data_container *inodes = NULL;
3903 struct btrfs_path *path = NULL;
3904 bool ignore_offset;
3905
3906 if (!capable(CAP_SYS_ADMIN))
3907 return -EPERM;
3908
3909 loi = memdup_user(arg, sizeof(*loi));
3910 if (IS_ERR(loi))
3911 return PTR_ERR(loi);
3912
3913 if (version == 1) {
3914 ignore_offset = false;
3915 size = min_t(u32, loi->size, SZ_64K);
3916 } else {
3917
3918 if (memchr_inv(loi->reserved, 0, sizeof(loi->reserved))) {
3919 ret = -EINVAL;
3920 goto out_loi;
3921 }
3922
3923 if (loi->flags & ~(BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET)) {
3924 ret = -EINVAL;
3925 goto out_loi;
3926 }
3927 ignore_offset = loi->flags & BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET;
3928 size = min_t(u32, loi->size, SZ_16M);
3929 }
3930
3931 path = btrfs_alloc_path();
3932 if (!path) {
3933 ret = -ENOMEM;
3934 goto out;
3935 }
3936
3937 inodes = init_data_container(size);
3938 if (IS_ERR(inodes)) {
3939 ret = PTR_ERR(inodes);
3940 inodes = NULL;
3941 goto out;
3942 }
3943
3944 ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
3945 build_ino_list, inodes, ignore_offset);
3946 if (ret == -EINVAL)
3947 ret = -ENOENT;
3948 if (ret < 0)
3949 goto out;
3950
3951 ret = copy_to_user((void __user *)(unsigned long)loi->inodes, inodes,
3952 size);
3953 if (ret)
3954 ret = -EFAULT;
3955
3956out:
3957 btrfs_free_path(path);
3958 kvfree(inodes);
3959out_loi:
3960 kfree(loi);
3961
3962 return ret;
3963}
3964
3965void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
3966 struct btrfs_ioctl_balance_args *bargs)
3967{
3968 struct btrfs_balance_control *bctl = fs_info->balance_ctl;
3969
3970 bargs->flags = bctl->flags;
3971
3972 if (test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags))
3973 bargs->state |= BTRFS_BALANCE_STATE_RUNNING;
3974 if (atomic_read(&fs_info->balance_pause_req))
3975 bargs->state |= BTRFS_BALANCE_STATE_PAUSE_REQ;
3976 if (atomic_read(&fs_info->balance_cancel_req))
3977 bargs->state |= BTRFS_BALANCE_STATE_CANCEL_REQ;
3978
3979 memcpy(&bargs->data, &bctl->data, sizeof(bargs->data));
3980 memcpy(&bargs->meta, &bctl->meta, sizeof(bargs->meta));
3981 memcpy(&bargs->sys, &bctl->sys, sizeof(bargs->sys));
3982
3983 spin_lock(&fs_info->balance_lock);
3984 memcpy(&bargs->stat, &bctl->stat, sizeof(bargs->stat));
3985 spin_unlock(&fs_info->balance_lock);
3986}
3987
3988static long btrfs_ioctl_balance(struct file *file, void __user *arg)
3989{
3990 struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
3991 struct btrfs_fs_info *fs_info = root->fs_info;
3992 struct btrfs_ioctl_balance_args *bargs;
3993 struct btrfs_balance_control *bctl;
3994 bool need_unlock;
3995 int ret;
3996
3997 if (!capable(CAP_SYS_ADMIN))
3998 return -EPERM;
3999
4000 ret = mnt_want_write_file(file);
4001 if (ret)
4002 return ret;
4003
4004again:
4005 if (btrfs_exclop_start(fs_info, BTRFS_EXCLOP_BALANCE)) {
4006 mutex_lock(&fs_info->balance_mutex);
4007 need_unlock = true;
4008 goto locked;
4009 }
4010
4011
4012
4013
4014
4015
4016
4017 mutex_lock(&fs_info->balance_mutex);
4018 if (fs_info->balance_ctl) {
4019
4020 if (!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4021 mutex_unlock(&fs_info->balance_mutex);
4022
4023
4024
4025
4026 mutex_lock(&fs_info->balance_mutex);
4027
4028 if (fs_info->balance_ctl &&
4029 !test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags)) {
4030
4031 need_unlock = false;
4032 goto locked;
4033 }
4034
4035 mutex_unlock(&fs_info->balance_mutex);
4036 goto again;
4037 } else {
4038
4039 mutex_unlock(&fs_info->balance_mutex);
4040 ret = -EINPROGRESS;
4041 goto out;
4042 }
4043 } else {
4044
4045 mutex_unlock(&fs_info->balance_mutex);
4046 ret = BTRFS_ERROR_DEV_EXCL_RUN_IN_PROGRESS;
4047 goto out;
4048 }
4049
4050locked:
4051
4052 if (arg) {
4053 bargs = memdup_user(arg, sizeof(*bargs));
4054 if (IS_ERR(bargs)) {
4055 ret = PTR_ERR(bargs);
4056 goto out_unlock;
4057 }
4058
4059 if (bargs->flags & BTRFS_BALANCE_RESUME) {
4060 if (!fs_info->balance_ctl) {
4061 ret = -ENOTCONN;
4062 goto out_bargs;
4063 }
4064
4065 bctl = fs_info->balance_ctl;
4066 spin_lock(&fs_info->balance_lock);
4067 bctl->flags |= BTRFS_BALANCE_RESUME;
4068 spin_unlock(&fs_info->balance_lock);
4069
4070 goto do_balance;
4071 }
4072 } else {
4073 bargs = NULL;
4074 }
4075
4076 if (fs_info->balance_ctl) {
4077 ret = -EINPROGRESS;
4078 goto out_bargs;
4079 }
4080
4081 bctl = kzalloc(sizeof(*bctl), GFP_KERNEL);
4082 if (!bctl) {
4083 ret = -ENOMEM;
4084 goto out_bargs;
4085 }
4086
4087 if (arg) {
4088 memcpy(&bctl->data, &bargs->data, sizeof(bctl->data));
4089 memcpy(&bctl->meta, &bargs->meta, sizeof(bctl->meta));
4090 memcpy(&bctl->sys, &bargs->sys, sizeof(bctl->sys));
4091
4092 bctl->flags = bargs->flags;
4093 } else {
4094
4095 bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
4096 }
4097
4098 if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
4099 ret = -EINVAL;
4100 goto out_bctl;
4101 }
4102
4103do_balance:
4104
4105
4106
4107
4108
4109
4110 need_unlock = false;
4111
4112 ret = btrfs_balance(fs_info, bctl, bargs);
4113 bctl = NULL;
4114
4115 if ((ret == 0 || ret == -ECANCELED) && arg) {
4116 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4117 ret = -EFAULT;
4118 }
4119
4120out_bctl:
4121 kfree(bctl);
4122out_bargs:
4123 kfree(bargs);
4124out_unlock:
4125 mutex_unlock(&fs_info->balance_mutex);
4126 if (need_unlock)
4127 btrfs_exclop_finish(fs_info);
4128out:
4129 mnt_drop_write_file(file);
4130 return ret;
4131}
4132
4133static long btrfs_ioctl_balance_ctl(struct btrfs_fs_info *fs_info, int cmd)
4134{
4135 if (!capable(CAP_SYS_ADMIN))
4136 return -EPERM;
4137
4138 switch (cmd) {
4139 case BTRFS_BALANCE_CTL_PAUSE:
4140 return btrfs_pause_balance(fs_info);
4141 case BTRFS_BALANCE_CTL_CANCEL:
4142 return btrfs_cancel_balance(fs_info);
4143 }
4144
4145 return -EINVAL;
4146}
4147
4148static long btrfs_ioctl_balance_progress(struct btrfs_fs_info *fs_info,
4149 void __user *arg)
4150{
4151 struct btrfs_ioctl_balance_args *bargs;
4152 int ret = 0;
4153
4154 if (!capable(CAP_SYS_ADMIN))
4155 return -EPERM;
4156
4157 mutex_lock(&fs_info->balance_mutex);
4158 if (!fs_info->balance_ctl) {
4159 ret = -ENOTCONN;
4160 goto out;
4161 }
4162
4163 bargs = kzalloc(sizeof(*bargs), GFP_KERNEL);
4164 if (!bargs) {
4165 ret = -ENOMEM;
4166 goto out;
4167 }
4168
4169 btrfs_update_ioctl_balance_args(fs_info, bargs);
4170
4171 if (copy_to_user(arg, bargs, sizeof(*bargs)))
4172 ret = -EFAULT;
4173
4174 kfree(bargs);
4175out:
4176 mutex_unlock(&fs_info->balance_mutex);
4177 return ret;
4178}
4179
4180static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg)
4181{
4182 struct inode *inode = file_inode(file);
4183 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4184 struct btrfs_ioctl_quota_ctl_args *sa;
4185 int ret;
4186
4187 if (!capable(CAP_SYS_ADMIN))
4188 return -EPERM;
4189
4190 ret = mnt_want_write_file(file);
4191 if (ret)
4192 return ret;
4193
4194 sa = memdup_user(arg, sizeof(*sa));
4195 if (IS_ERR(sa)) {
4196 ret = PTR_ERR(sa);
4197 goto drop_write;
4198 }
4199
4200 down_write(&fs_info->subvol_sem);
4201
4202 switch (sa->cmd) {
4203 case BTRFS_QUOTA_CTL_ENABLE:
4204 ret = btrfs_quota_enable(fs_info);
4205 break;
4206 case BTRFS_QUOTA_CTL_DISABLE:
4207 ret = btrfs_quota_disable(fs_info);
4208 break;
4209 default:
4210 ret = -EINVAL;
4211 break;
4212 }
4213
4214 kfree(sa);
4215 up_write(&fs_info->subvol_sem);
4216drop_write:
4217 mnt_drop_write_file(file);
4218 return ret;
4219}
4220
4221static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg)
4222{
4223 struct inode *inode = file_inode(file);
4224 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4225 struct btrfs_root *root = BTRFS_I(inode)->root;
4226 struct btrfs_ioctl_qgroup_assign_args *sa;
4227 struct btrfs_trans_handle *trans;
4228 int ret;
4229 int err;
4230
4231 if (!capable(CAP_SYS_ADMIN))
4232 return -EPERM;
4233
4234 ret = mnt_want_write_file(file);
4235 if (ret)
4236 return ret;
4237
4238 sa = memdup_user(arg, sizeof(*sa));
4239 if (IS_ERR(sa)) {
4240 ret = PTR_ERR(sa);
4241 goto drop_write;
4242 }
4243
4244 trans = btrfs_join_transaction(root);
4245 if (IS_ERR(trans)) {
4246 ret = PTR_ERR(trans);
4247 goto out;
4248 }
4249
4250 if (sa->assign) {
4251 ret = btrfs_add_qgroup_relation(trans, sa->src, sa->dst);
4252 } else {
4253 ret = btrfs_del_qgroup_relation(trans, sa->src, sa->dst);
4254 }
4255
4256
4257 err = btrfs_run_qgroups(trans);
4258 if (err < 0)
4259 btrfs_handle_fs_error(fs_info, err,
4260 "failed to update qgroup status and info");
4261 err = btrfs_end_transaction(trans);
4262 if (err && !ret)
4263 ret = err;
4264
4265out:
4266 kfree(sa);
4267drop_write:
4268 mnt_drop_write_file(file);
4269 return ret;
4270}
4271
4272static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
4273{
4274 struct inode *inode = file_inode(file);
4275 struct btrfs_root *root = BTRFS_I(inode)->root;
4276 struct btrfs_ioctl_qgroup_create_args *sa;
4277 struct btrfs_trans_handle *trans;
4278 int ret;
4279 int err;
4280
4281 if (!capable(CAP_SYS_ADMIN))
4282 return -EPERM;
4283
4284 ret = mnt_want_write_file(file);
4285 if (ret)
4286 return ret;
4287
4288 sa = memdup_user(arg, sizeof(*sa));
4289 if (IS_ERR(sa)) {
4290 ret = PTR_ERR(sa);
4291 goto drop_write;
4292 }
4293
4294 if (!sa->qgroupid) {
4295 ret = -EINVAL;
4296 goto out;
4297 }
4298
4299 trans = btrfs_join_transaction(root);
4300 if (IS_ERR(trans)) {
4301 ret = PTR_ERR(trans);
4302 goto out;
4303 }
4304
4305 if (sa->create) {
4306 ret = btrfs_create_qgroup(trans, sa->qgroupid);
4307 } else {
4308 ret = btrfs_remove_qgroup(trans, sa->qgroupid);
4309 }
4310
4311 err = btrfs_end_transaction(trans);
4312 if (err && !ret)
4313 ret = err;
4314
4315out:
4316 kfree(sa);
4317drop_write:
4318 mnt_drop_write_file(file);
4319 return ret;
4320}
4321
4322static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg)
4323{
4324 struct inode *inode = file_inode(file);
4325 struct btrfs_root *root = BTRFS_I(inode)->root;
4326 struct btrfs_ioctl_qgroup_limit_args *sa;
4327 struct btrfs_trans_handle *trans;
4328 int ret;
4329 int err;
4330 u64 qgroupid;
4331
4332 if (!capable(CAP_SYS_ADMIN))
4333 return -EPERM;
4334
4335 ret = mnt_want_write_file(file);
4336 if (ret)
4337 return ret;
4338
4339 sa = memdup_user(arg, sizeof(*sa));
4340 if (IS_ERR(sa)) {
4341 ret = PTR_ERR(sa);
4342 goto drop_write;
4343 }
4344
4345 trans = btrfs_join_transaction(root);
4346 if (IS_ERR(trans)) {
4347 ret = PTR_ERR(trans);
4348 goto out;
4349 }
4350
4351 qgroupid = sa->qgroupid;
4352 if (!qgroupid) {
4353
4354 qgroupid = root->root_key.objectid;
4355 }
4356
4357 ret = btrfs_limit_qgroup(trans, qgroupid, &sa->lim);
4358
4359 err = btrfs_end_transaction(trans);
4360 if (err && !ret)
4361 ret = err;
4362
4363out:
4364 kfree(sa);
4365drop_write:
4366 mnt_drop_write_file(file);
4367 return ret;
4368}
4369
4370static long btrfs_ioctl_quota_rescan(struct file *file, void __user *arg)
4371{
4372 struct inode *inode = file_inode(file);
4373 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4374 struct btrfs_ioctl_quota_rescan_args *qsa;
4375 int ret;
4376
4377 if (!capable(CAP_SYS_ADMIN))
4378 return -EPERM;
4379
4380 ret = mnt_want_write_file(file);
4381 if (ret)
4382 return ret;
4383
4384 qsa = memdup_user(arg, sizeof(*qsa));
4385 if (IS_ERR(qsa)) {
4386 ret = PTR_ERR(qsa);
4387 goto drop_write;
4388 }
4389
4390 if (qsa->flags) {
4391 ret = -EINVAL;
4392 goto out;
4393 }
4394
4395 ret = btrfs_qgroup_rescan(fs_info);
4396
4397out:
4398 kfree(qsa);
4399drop_write:
4400 mnt_drop_write_file(file);
4401 return ret;
4402}
4403
4404static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
4405 void __user *arg)
4406{
4407 struct btrfs_ioctl_quota_rescan_args *qsa;
4408 int ret = 0;
4409
4410 if (!capable(CAP_SYS_ADMIN))
4411 return -EPERM;
4412
4413 qsa = kzalloc(sizeof(*qsa), GFP_KERNEL);
4414 if (!qsa)
4415 return -ENOMEM;
4416
4417 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
4418 qsa->flags = 1;
4419 qsa->progress = fs_info->qgroup_rescan_progress.objectid;
4420 }
4421
4422 if (copy_to_user(arg, qsa, sizeof(*qsa)))
4423 ret = -EFAULT;
4424
4425 kfree(qsa);
4426 return ret;
4427}
4428
4429static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,
4430 void __user *arg)
4431{
4432 if (!capable(CAP_SYS_ADMIN))
4433 return -EPERM;
4434
4435 return btrfs_qgroup_wait_for_completion(fs_info, true);
4436}
4437
4438static long _btrfs_ioctl_set_received_subvol(struct file *file,
4439 struct btrfs_ioctl_received_subvol_args *sa)
4440{
4441 struct inode *inode = file_inode(file);
4442 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
4443 struct btrfs_root *root = BTRFS_I(inode)->root;
4444 struct btrfs_root_item *root_item = &root->root_item;
4445 struct btrfs_trans_handle *trans;
4446 struct timespec64 ct = current_time(inode);
4447 int ret = 0;
4448 int received_uuid_changed;
4449
4450 if (!inode_owner_or_capable(&init_user_ns, inode))
4451 return -EPERM;
4452
4453 ret = mnt_want_write_file(file);
4454 if (ret < 0)
4455 return ret;
4456
4457 down_write(&fs_info->subvol_sem);
4458
4459 if (btrfs_ino(BTRFS_I(inode)) != BTRFS_FIRST_FREE_OBJECTID) {
4460 ret = -EINVAL;
4461 goto out;
4462 }
4463
4464 if (btrfs_root_readonly(root)) {
4465 ret = -EROFS;
4466 goto out;
4467 }
4468
4469
4470
4471
4472
4473 trans = btrfs_start_transaction(root, 3);
4474 if (IS_ERR(trans)) {
4475 ret = PTR_ERR(trans);
4476 trans = NULL;
4477 goto out;
4478 }
4479
4480 sa->rtransid = trans->transid;
4481 sa->rtime.sec = ct.tv_sec;
4482 sa->rtime.nsec = ct.tv_nsec;
4483
4484 received_uuid_changed = memcmp(root_item->received_uuid, sa->uuid,
4485 BTRFS_UUID_SIZE);
4486 if (received_uuid_changed &&
4487 !btrfs_is_empty_uuid(root_item->received_uuid)) {
4488 ret = btrfs_uuid_tree_remove(trans, root_item->received_uuid,
4489 BTRFS_UUID_KEY_RECEIVED_SUBVOL,
4490 root->root_key.objectid);
4491 if (ret && ret != -ENOENT) {
4492 btrfs_abort_transaction(trans, ret);
4493 btrfs_end_transaction(trans);
4494 goto out;
4495 }
4496 }
4497 memcpy(root_item->received_uuid, sa->uuid, BTRFS_UUID_SIZE);